CN221162169U

CN221162169U - Distributed power assembly and electric vehicle

Info

Publication number: CN221162169U
Application number: CN202322363113.5U
Authority: CN
Inventors: 余国权; 曹超; 李由力; 黄镇
Original assignee: Huawei Digital Power Technologies Co Ltd
Current assignee: Huawei Digital Power Technologies Co Ltd
Priority date: 2023-08-30
Filing date: 2023-08-30
Publication date: 2024-06-18
Anticipated expiration: 2033-08-30

Abstract

The application provides a distributed power assembly and an electric vehicle, wherein the power assembly comprises a middle baffle plate, two motors and at least one rotary transformer, the middle baffle plate is used for respectively and rotatably connecting motor shafts of the two motors through two motor bearings, the middle baffle plate comprises two end faces, the directions of the two end faces are opposite, one end face is used for fixing a stator of one rotary transformer and one motor bearing, the inner diameter of the stator of one rotary transformer is larger than the outer diameter of the one motor bearing along the radial direction of the motor, a gap between the stator of one rotary transformer and the outer ring of the one motor bearing is used for accommodating one rotor of one rotary transformer and one end of one motor shaft in transmission connection with the one motor bearing, so that the motor shafts and the motor bearings can be accommodated in the gap, the rotary transformer and the motor bearings can be distributed along the radial direction of the motor, the size of the motor shafts is reduced, the axial size of the motor and the power assembly is reduced, the internal distribution of the power assembly is compact, and the whole vehicle layout is facilitated to be optimized.

Description

Distributed power assembly and electric vehicle

Technical Field

The application relates to the field of power assemblies, in particular to a distributed power assembly and an electric vehicle.

Background

With the progress of technology, more and more vehicle enterprises push out a dual-motor power system, and in order to improve the vehicle control stability and the driving experience, a requirement of applying a distributed dual-motor assembly to a rear axle or a front axle and a rear axle is provided. In order to accelerate development rhythm and reduce development cost, a vehicle enterprise generally requires a double-motor assembly to have better arrangement matching property, can adapt to the space requirements of front and rear shaft arrangement, and has the problems of overlarge axial dimension and difficult overall vehicle arrangement when the existing double-motor assembly is arranged on the whole vehicle.

Disclosure of utility model

The embodiment of the application provides a distributed power assembly capable of reducing axial size and an electric vehicle.

In a first aspect, an embodiment of the present application provides a distributed power assembly, where the power assembly includes a middle partition, two motors and at least one resolver, the middle partition is used to rotationally connect motor shafts of the two motors through two motor bearings, respectively, the middle partition includes two end faces, the two end faces face opposite to each other, one end face is used to fix a stator of one resolver and one motor bearing, in a radial direction of the motor, an inner diameter of the stator of one resolver is larger than an outer diameter of one motor bearing, and a gap between the stator of one resolver and an outer ring of one motor bearing is used to accommodate one end of one motor shaft in driving connection with a rotor of one resolver and one motor bearing.

In the embodiment of the application, the power assembly comprises two motors, and the power assembly has high integration level along the axial direction of the motors, can reduce the volume and the cost, improves the power density, and is beneficial to adapting to the performance requirement of the electric vehicle field on the power assembly. Wherein the motor is used for converting electric energy into mechanical energy. Two motors are located in the two sides of the middle partition plate along the motor axial direction, in each motor, a motor shaft is rotationally connected with the middle partition plate through a motor bearing, and when the motor works, the motor shaft can rotate relative to the middle partition plate. The rotary transformer is used for monitoring the rotating speed of the motor shaft so as to control the rotating speed of the motor shaft, thereby improving the safety performance of the electric vehicle.

In the embodiment of the application, the stator of the rotary transformer is a rotary stator, the rotor of the rotary transformer is a rotary rotor, and the inner diameter of the rotary stator is larger than the outer diameter of the motor bearing along the radial direction of the motor, so that the inner side of the rotary stator has enough space for accommodating the rotary rotor and part of the motor shaft, and preconditions are provided for the radial arrangement of the rotary stator and the motor bearing along the motor. The gap is formed between the rotary transformer stator and the outer ring of the motor bearing along the radial direction of the motor, and is used for the rotary transformer rotor and the motor shaft to pass through, or is used for avoiding the rotary transformer rotor and the motor shaft, and the inner diameter of the rotary transformer stator is larger than the outer diameter of the motor bearing.

In the embodiment of the application, the integration level of the power assembly is high, which is beneficial to realizing the light weight design of the power assembly. The motor bearing and the rotary transformer are respectively positioned on the inner surface and the outer surface of the motor shaft and are radially arranged along the motor, so that the axial size of the motor is reduced, the installation space is provided for arranging other devices, the power assembly is internally compact in arrangement, the power assembly is further adapted to chassis of different vehicle types, and the overall layout of the whole vehicle is optimized.

In one embodiment, a motor shaft includes a bearing mounting section including a groove having a notch facing the intermediate diaphragm, the recess having a recess direction axially away from the intermediate diaphragm, the recess including an inner peripheral surface for driving engagement with an outer race of a motor bearing and an outer peripheral surface. The outer peripheral surface is used for fixing a rotor of a rotary transformer.

In the embodiment of the application, the groove in the motor shaft is recessed away from the middle partition plate along the motor axial direction, and the area between the groove and the middle partition plate can be used for accommodating the motor bearing, so that the motor bearing is fixedly connected with the motor shaft and the middle partition plate respectively, specifically, the outer ring of the motor bearing is fixedly connected with the inner peripheral surface of the groove, the inner ring of the motor bearing is fixedly connected with the middle partition plate, and the outer ring of the motor bearing is rotationally connected with the inner ring, so that the motor bearing can rotate along with the motor shaft relative to the middle partition plate. The outer peripheral surface and the inner peripheral surface of the groove are arranged along the radial direction of the motor, and the rotary rotor is fixedly connected with the outer peripheral surface of the groove, so that the rotary rotor of the rotary transformer can rotate along with the motor shaft relative to the middle partition plate. The motor bearing and the rotary transformer are positioned on two sides of the bearing mounting section along the radial direction of the motor, and share the bearing mounting section, so that the axial length of the motor shaft is reduced, the processing materials are reduced, the cost is reduced, and the axial length of the power assembly is reduced.

In one embodiment, one end face includes a motor bearing fixing protrusion and a rotational-change fixing protrusion, the motor bearing fixing protrusion being for fixing an inner ring of one motor bearing. The rotary fixing protrusion is used for fixing a stator of a rotary transformer. Along the radial direction of the motor, the rotary-variable fixing protrusions and the motor bearing fixing protrusions are arranged at intervals, and a motor bearing, a bearing mounting section, a rotor and a stator of a rotary transformer are sequentially arranged between the rotary-variable fixing protrusions and the motor bearing fixing protrusions.

In the embodiment of the application, along the axial direction of the motor, the motor bearing fixing protrusion protrudes towards the motor shaft, and the inner ring of the motor bearing is fixed with the motor bearing fixing protrusion so as to realize the fixed connection between the inner ring of the motor bearing and the middle partition plate. The inner ring and the outer ring of the motor bearing are respectively fixed on the surface of the motor bearing fixing protrusion and the inner peripheral surface of the groove, so that the motor shaft is rotationally connected with the middle partition plate through the motor bearing. The motor bearing is matched with the motor bearing fixing protrusion and the motor shaft in the groove so as to reserve the outer peripheral surface of the groove for fixing the rotary transformer, thereby reducing the axial size of the motor shaft and being beneficial to motor miniaturization. The rotary transformer fixing protrusions and the motor bearing fixing protrusions are arranged at intervals along the radial direction of the motor, so that gaps between the rotary transformer fixing protrusions and the motor bearing fixing protrusions can be used for sequentially accommodating the motor bearing, the bearing mounting section, the rotary transformer and the rotary transformer stator, the rotary transformer and the motor bearing are compactly distributed in the radial direction of the motor, and the reduction of the size of the power assembly is facilitated.

In the embodiment of the application, along the axial direction of the motor, the rotary-variable fixing protrusion protrudes towards the motor shaft, the rotary-variable stator is fixed with the rotary-variable fixing protrusion so as to realize the fixed connection between the rotary-variable stator and the middle partition plate of the rotary transformer, the rotary-variable rotor is fixed on the bearing mounting section of the motor shaft, and when the motor shaft rotates, the rotary-variable rotor can rotate relative to the rotary-variable stator along with the motor shaft, and the rotary-variable stator and the rotary-variable fixing protrusion keep static. Through setting up the fixed arch of changeing for the resolver's the stator of changeing is fixed in the middle baffle relatively, in order to guarantee the normal work of resolver.

In one embodiment, the motor bearing fixing protrusion comprises a bearing fixing section and an axial limiting section, the bearing fixing section is used for fixing an inner ring of one motor bearing, and the axial limiting section is used for being abutted against one motor bearing along the motor axial direction, wherein the outer diameter of the axial limiting section is larger than the outer diameter of the bearing fixing section along the motor radial direction. The bearing fixing section, the axial limiting section and the other end face of the middle partition plate are sequentially arranged along the axial direction of the motor. Along the axial direction of the motor, the length of the axial limiting section is smaller than the length of the rotary fixing protrusion, and the length of the rotary fixing protrusion is smaller than the sum of the lengths of the bearing fixing section and the axial limiting section.

In the embodiment of the application, the bearing fixing section, the axial limiting section and the other end face of one end face are axially distributed along the motor, the inner ring of the motor bearing is fixed on the bearing fixing section, and the radial outer diameter of the axial limiting section along the motor is larger than the radial outer diameter of the bearing fixing section along the motor, so that the end face of the axial limiting section, which faces the motor bearing along the motor axial direction, can be used for limiting the motor bearing, the motor bearing is prevented from axial displacement, and the normal operation of the motor is ensured.

In the embodiment of the application, the length of the rotary deformation fixing protrusion in the motor shaft direction is larger than that of the axial limiting section in the motor shaft direction, so that the length of the axial limiting section is relatively smaller, the space occupied by the middle partition plate in the motor shaft direction can be reduced, and the axial dimensions of the motor and the power assembly can be shortened. The length of the rotary fixing protrusion is relatively larger, so that the axial distance between the rotary fixing protrusion and the rotary stator is reduced, the operation difficulty of fixing the rotary stator and the rotary fixing protrusion is reduced, the length of the rotary fixing protrusion is relatively larger, and a sufficient gap is reserved between the rotary fixing protrusion and the motor bearing fixing protrusion for accommodating a bearing mounting section of a motor shaft. The sum of the lengths of the bearing fixing section and the axial limiting section is larger than the length of the rotary-changing fixing protrusion, so that the motor bearing is beneficial to providing an installation space in the motor shaft direction.

In one embodiment, each motor further includes a motor housing and motor windings, the motor housings of the two motors being arranged on both sides of the intermediate partition plate in the motor axial direction, the motor housing being for accommodating the motor shaft, the motor bearing and the resolver, one motor housing, one motor winding and the rotation fixing protrusion being arranged on the same side of one end face, wherein a distance between the rotation fixing protrusion and one motor housing in the motor radial direction is greater than a length of one motor winding, and a gap between the rotation fixing protrusion and one motor housing in the motor radial direction being for accommodating a portion of one motor winding.

In the embodiment of the application, the middle partition plate is axially arranged between the two motor shells along the motor, and the motor shells are used for accommodating the motor shaft, the motor bearing and the rotary transformer inside, so that the middle partition plate is reused by the two motors, and the material consumption and the cost are reduced. The motor winding is used for receiving alternating current, the rotation fixing protrusion and the motor shell are arranged at intervals along the radial direction of the motor, the distance between the motor winding and the motor shell along the radial direction of the motor is smaller than the distance between the rotation fixing protrusion and the motor shell along the radial direction of the motor, so that the radial clearance between the rotation fixing protrusion and the motor shell along the radial direction of the motor can be used for accommodating the motor winding, the utilization rate of radial space is improved, the sum of the axial lengths of the motor winding and the rotation fixing protrusion can be shortened, and the reduction of the axial length of the power assembly is facilitated.

In one embodiment, a motor shaft further comprises a rotor mounting section, an outer circumferential surface of the rotor mounting section for securing a motor rotor, wherein the rotor mounting section and the bearing mounting section are coaxially connected, and the bearing mounting section is arranged between the rotor mounting section and the middle barrier along the motor axial direction. Along the radial direction of the motor, the outer diameter of the bearing mounting section is larger than that of the rotor mounting section.

In the embodiment of the application, the motor rotor is fixed on the outer peripheral surface of the rotor mounting section, and the rotor mounting section is coaxially connected with the bearing mounting section, so that the coaxiality of the motor rotor and the motor bearing is improved, and the transmission stability of the motor is improved. The external diameter of the bearing installation section is larger than that of the rotor installation section, and the structural strength of the motor shaft is improved on the premise that the motor shaft can accommodate the motor bearing. In addition, the outer diameter of the rotor mounting section is smaller, the radial volume of the motor along the motor can be reduced, and the motor is convenient to miniaturize.

In one embodiment, the rotor mounting section includes an inner cavity, and the recess of the bearing mounting section is in communication with the inner cavity of the rotor mounting section to form a motor shaft cavity, the inner diameter of the bearing mounting section being greater than the inner diameter of the rotor mounting section. In the embodiment of the application, the inner diameter of the bearing mounting section is larger than that of the rotor mounting section, so that more space is reserved in the motor shaft for accommodating the motor bearings and other structures, and on the basis, if the outer diameter of the bearing mounting section is equal to or smaller than that of the rotor mounting section, the thickness of the motor shaft along the radial direction of the motor can be greatly reduced.

In one embodiment, each motor further comprises motor windings, one motor winding and one motor bearing are arranged on the same side of one end face, wherein one motor bearing, one resolver and one motor winding are arranged in sequence in the radial direction of the motor. Along the radial direction of the motor, the projection of a rotary transformer, the projection of a motor winding and the projection of a motor bearing are partially overlapped.

In the embodiment of the application, the motor winding is used for receiving alternating current, the motor bearing and the rotary transformer are arranged along the radial direction of the motor, so that the rotary transformer can be accommodated between the motor bearing and the motor winding along the radial direction of the motor, the projection of the rotary transformer along the radial direction of the motor is overlapped with the projection part of the motor winding along the radial direction of the motor, the space of the motor in the radial direction of the motor is fully utilized, the integral axial dimension of the motor is shortened, and the size of the power assembly is reduced.

In one embodiment, the other end face is used for fixing a stator of the other rotary transformer and the other motor bearing, the other motor bearing is used for being in transmission connection with a motor shaft of the other motor, and the other motor bearing is used for being in transmission connection with the motor shaft of the other motor. Wherein the motor bearing fixing protrusion of the other end face is used for fixing the inner ring of the other motor bearing. The rotary-change fixing protrusion of the other end face is used for fixing the stator of the other rotary transformer. The motor bearing fixing protrusion and the rotary-changing fixing protrusion of the other end face and the one end face are identical in structure and arrangement.

In the embodiment of the application, the inner ring of the other rotary change stator and the other motor bearing is fixed with the other end face, and the inner ring of the other rotary change stator and the other motor bearing and the middle partition plate keep static when the motor works. The two end surfaces of the middle partition plate along the axial direction of the motor form a symmetrical structure, so that the internal layout of the power assembly can be optimized, and the dynamic balance design of the two motors can be realized

In one embodiment, the motor further comprises brushes for electrical connection with the middle spacer, the motor shaft comprising a motor shaft cavity for receiving and securing the brushes, a motor bearing and a rotary transformer being arranged in sequence along the radial direction of the motor.

In the embodiment of the application, the electric brush is used for grounding, the electric brush is contacted with the middle partition plate and is electrically connected, and the electric brush is positioned in the cavity of the motor shaft, so that the electric voltage generated by the motor shaft is grounded, a grounding path is formed in the motor, and accumulated electric charge can be conducted to the ground end by the electric brush. In addition, because the electric brush and the motor bearing are in contact with the middle partition plate, the electric brush can also prevent the motor bearing from being corroded electrically, and the motor bearing can work normally. The electric brush is accommodated in the motor shaft cavity, so that the space in the motor shaft cavity can be fully utilized, and the size of the motor can be conveniently reduced. The radial electric brush of following the motor is arranged in the inboard that the motor bearing deviates from resolver for the electric brush can be relative along the motor axial with an terminal surface of median septum, is favorable to shortening the distance between electric brush and the median septum, promotes the electric connection stability of electric brush and median septum.

In one embodiment, the brush includes a brush-fixing portion and a conductive bristle, and the motor shaft cavity is configured to receive and fix the brush-fixing portion, wherein a length of the conductive bristle in a motor axial direction is greater than or equal to a distance between the brush-fixing portion and a motor bearing fixing protrusion in one end face. The brush fixing part, the conductive brush hair and a motor bearing are arranged in sequence along the axial direction of the motor.

In the embodiment of the application, the length of the conductive brush hair is larger than or equal to the distance between the brush fixing part and the motor bearing fixing protrusion in the motor axial direction, so that the conductive brush hair in the brush needs to be contacted with the middle partition plate to realize grounding. The distance between the electric brush fixing part and the motor bearing fixing protrusion refers to the distance between the end face of the electric brush fixing part, which faces the motor bearing fixing protrusion along the motor axial direction, and the motor bearing fixing protrusion. Along motor axial, brush fixed part is located the one side that the conducting brush hair kept away from the middle baffle, and the brush passes through the inner wall fixed connection in brush fixed part and motor shaft cavity, is favorable to promoting the brush stability on the structure, avoids the brush to take place obvious displacement along motor axial relative motor shaft, guarantees the effect that the brush steadily plays the ground connection.

In one embodiment, the powertrain further includes two reducers, each of which includes a reducer input shaft, an input shaft drive gear and a reducer end plate, the reducer input shaft is rotatably connected to the reducer end plate, the input shaft drive gear is fixed to the reducer input shaft, wherein, in the adjacently arranged reducers and motors, the input shaft drive gear, the reducer end plate, and the motor rotor of the motor are sequentially arranged at intervals along the motor axis. Each speed reducer further comprises an intermediate shaft, an intermediate shaft driven gear and an intermediate shaft bearing, wherein the intermediate shaft driven gear is fixed on the intermediate shaft, the intermediate shaft driven gear is meshed with the input shaft driving gear, the intermediate shaft is rotationally connected with the end plate of the speed reducer through the intermediate shaft bearing, and the axial direction of the intermediate shaft is parallel to the axial direction of the motor. In a speed reducer, at least one end face of a driven gear of an intermediate shaft includes a groove structure in an axial direction of a motor, a notch caliber of the groove structure is larger than an outer diameter of an intermediate shaft bearing, and the groove structure is used for accommodating at least part of the intermediate shaft bearing.

In the embodiment of the application, the input shaft of the speed reducer is fixedly connected with the motor shaft, the input shaft of the speed reducer can synchronously rotate with the motor shaft, the driving gear of the input shaft is fixed on the input shaft of the speed reducer, the driven gear of the intermediate shaft is fixed on the intermediate shaft, and the driving gear of the input shaft is meshed with the driven gear of the intermediate shaft, so that the input shaft of the speed reducer can drive the intermediate shaft to rotate, namely, torque can be sequentially transmitted among the motor shaft, the input shaft of the speed reducer and the intermediate shaft.

In the embodiment of the application, the speed reducer input shaft is rotatably connected with the speed reducer end plate, and the speed reducer input shaft can rotate relative to the speed reducer end plate. The reducer and the motor which are adjacently arranged share the reducer end plate, so that structural multiplexing is realized in the power assembly, and the material and processing cost of the power assembly are reduced. In the motor shaft upwards, the rotary transformer is located one side of the reducer end plate far away from the input shaft driving gear, and the space between motor stators in the two motors is fully utilized, so that the power assembly structure is more compact, and the power assembly is miniaturized.

In an embodiment of the application, in at least one reducer, at least one end face of the intermediate shaft driven gear comprises a groove structure along the intermediate shaft axis, the notch of the groove structure is large enough to enable at least part of the intermediate shaft bearing to be accommodated in the groove structure, and along the intermediate shaft radial direction, the projection of the groove structure covers at least part of the projection of the intermediate shaft bearing, which is equivalent to reducing the sum of the lengths of the intermediate shaft driven gear and the intermediate shaft bearing in the intermediate shaft axis direction, wherein the intermediate shaft axis direction is parallel to the motor axis direction. If the groove structure is not arranged on the end face of the driven gear of the intermediate shaft along the axial direction of the motor, the intermediate shaft bearing can only be arranged close to the end face of the driven gear of the intermediate shaft, the reduction of the axial length of the speed reducer on the power assembly is not facilitated, the power assembly comprises two speed reducers, and the problem of overlarge axial length is further aggravated. The embodiment of the application is provided with the groove structure to accommodate at least part of the intermediate shaft bearing, so that other structures can be arranged in the free space in the axial direction of the power assembly, the flexibility and compactness of the internal layout of the power assembly are enhanced, the miniaturized design of the power assembly is realized, and the whole vehicle layout is optimized.

In one embodiment, each of the reducers includes a fluted countershaft driven gear, wherein in each of the reducers the fluted configuration of the countershaft driven gear has a notch facing the reducer end plate. The notches of the groove structures in the two reducers are oppositely oriented. In the embodiment of the application, the two intermediate shaft driven gears with the groove structures are arranged in the power assembly, so that the two groove structures can be respectively used for accommodating at least part of the intermediate shaft bearing, and the axial length of the power assembly is further reduced.

In one embodiment, each reducer further comprises an intermediate bearing mount by which the reducer end plate secures the intermediate shaft bearing, the intermediate bearing mount being secured to the reducer end plate, the notch of the groove structure being oriented towards the intermediate bearing mount, the groove structure further being adapted to receive at least a portion of the intermediate bearing mount, wherein the intermediate shaft, the intermediate shaft bearing and the intermediate bearing mount are arranged in sequence in a radial direction of the intermediate shaft. Along the axial direction of the intermediate shaft, the end plate of the speed reducer, the intermediate bearing fixing piece and the groove structure are sequentially arranged.

In an embodiment of the application, the groove structure is notched towards the intermediate bearing mount, which is fixed to the end plate of the reduction gear, so that the space enclosed by the groove structure and the intermediate bearing mount can be used for accommodating at least part of the intermediate shaft bearing. Wherein, part jackshaft bearing and part jackshaft bearing mounting all are located groove structure, are favorable to reducing the axial length of reduction gear, and then realize power assembly's miniaturized design, optimize whole car overall arrangement. In the radial direction of the intermediate shaft, the intermediate shaft bearing is positioned between the intermediate shaft and the intermediate bearing fixing piece, in the axial direction of the intermediate shaft, the intermediate bearing fixing piece is positioned between the end plate of the speed reducer and the groove structure, and the intermediate bearing fixing piece simultaneously carries out axial limiting and radial limiting on the intermediate shaft bearing, so that the intermediate shaft bearing is ensured not to deviate axially or radially, and the transmission stability of the speed reducer is facilitated.

In one embodiment, one of the end faces of the intermediate shaft driven gear includes a groove structure along the motor axial direction, and the other end face of the intermediate shaft driven gear is a plane. In the embodiment of the application, the other end face of the intermediate shaft driven gear is a plane, which is beneficial to reducing the processing difficulty and the processing procedures.

In one embodiment, along the motor axial direction, one of the end faces of the intermediate shaft driven gear comprises a groove structure, the other end face of the intermediate shaft driven gear comprises a shallow slot, the shallow slot faces away from the notch of the groove structure, and the depth of the groove structure along the motor axial direction is greater than the depth of the shallow slot along the motor axial direction. In the embodiment of the application, the other end face of the driven gear of the intermediate shaft comprises the shallow slot, and the shallow slot and the notch of the groove structure face opposite to each other, so that the shallow slot can provide a clearance space for other parts and reduce abrasion. In the embodiment of the application, the shallow slot is designed on the other end face of the gear, which is beneficial to reducing the weight of the gear and the weight of the power assembly.

In one embodiment, each motor comprises a motor housing, each reducer comprising a reducer housing and a reducer cover, the motor housing for housing a motor shaft, a motor bearing and a resolver, the reducer housing for housing a reducer input shaft, an input shaft drive gear, a countershaft driven gear and a countershaft bearing, wherein, in the motor axial direction, the reducer housings of the two reducers are arranged between the reducer cover of the two reducers, the reducer end plates of the two reducers are arranged between the reducer housings of the two reducers, the motor housings of the two motors are arranged between the reducer end plates of the two reducers. In each speed reducer, along the axial direction of the motor, a speed reducer cover plate, a speed reducer shell and a speed reducer end plate are sequentially arranged, and the speed reducer cover plate and the speed reducer end plate are fixed on the speed reducer shell. In the motor axial direction, the projection of at least one of the intermediate shaft, the intermediate shaft bearing and the intermediate shaft driven gear does not overlap with the projection portion of the motor housing.

In the embodiment of the application, in each reducer, along the axial direction of a motor, a reducer shell is positioned between a reducer cover plate and a reducer end plate, the reducer cover plate, the reducer shell and the reducer end plate jointly enclose a reducer accommodating cavity, a reducer input shaft, an input shaft driving gear, a jackshaft driven gear and a jackshaft bearing are positioned in the reducer accommodating cavity, and the reducer cover plate, the reducer shell and the reducer end plate play a role in protecting and accommodating internal devices of the reducer. In every motor, along the motor axial, the motor casing is located between reduction gear end plate and the middle baffle, and reduction gear end plate, motor casing and middle baffle enclose into the motor and hold the chamber, and motor shaft, motor bearing and resolver are located the motor and hold the intracavity, and reduction gear end plate, motor casing and middle baffle play the effect of holding and protecting the inside device of motor. Wherein, reduction gear and motor sharing reduction gear end plate of adjacent range, two motors of adjacent range share baffle in, a plurality of structures of reuse in power assembly inside can reduce materials, reduce cost, and structural layout is compacter simultaneously, is favorable to the lightweight design of power assembly.

In the embodiment of the application, the two motors and the two reducers are not simply stacked along the axial direction of the motors, in each reducer, at least part of the intermediate shaft and at least part of the intermediate shaft bearing are positioned in the area outside the projection of the motor shell and the intermediate plate along the axial direction of the motors, so that the two reducers and the two motors form a U-shaped structure, when the intermediate shaft bearing in the reducer is accommodated in the groove structure of the intermediate shaft driven gear, the axial length of the part of the reducer, which is not overlapped with the motor along the axial direction, can be reduced, the arrangement between the motor and the reducer is compact, and the integral axial length of the power assembly is reduced.

In a second aspect, an embodiment of the present application provides an electric vehicle, including a vehicle body, wheels, a battery pack, and a power assembly according to any one of the embodiments of the first aspect, the power assembly being fixed to the vehicle body, a speed reducer of the power assembly being arranged between one of the wheels and a motor of the power assembly along an axial direction of the wheels, the motor of the power assembly being configured to receive electric energy provided by the battery pack and to convert the electric energy into kinetic energy for transmission to the wheels via the speed reducer of the power assembly, so as to drive the wheels. In the embodiment of the application, the power assembly according to any one of the embodiments of the first aspect is applied to the electric vehicle, and because the internal devices of the power assembly are regularly and compactly distributed and have smaller axial length, the whole volume of the electric vehicle is reduced, and the whole vehicle layout is optimized.

Drawings

In order to more clearly describe the technical solution in the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be described below.

Fig. 1 is a schematic structural view of an electric vehicle according to an embodiment of the present application;

FIG. 2 is a schematic diagram of a powertrain according to an embodiment of the present application;

FIG. 3 is a cross-sectional view of a powertrain provided in an embodiment of the present application;

FIG. 4 is a partial cross-sectional view of a powertrain provided in an embodiment of the present application;

FIG. 5 is an enlarged view of a portion M of the powertrain shown in FIG. 4;

FIG. 6 is a schematic view of a brush according to an embodiment of the present application;

FIG. 7 is a partial cross-sectional view of a powertrain provided in an embodiment of the present application;

FIG. 8 is a schematic view of a portion of a powertrain according to an embodiment of the present application;

FIG. 9 is a partial cross-sectional view of a powertrain provided in an embodiment of the present application.

Detailed Description

The following description of the technical solutions according to the embodiments of the present application will be given with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments.

In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

Furthermore, herein, the terms "upper," "lower," and the like, are defined with respect to the orientation in which the structure is schematically disposed in the drawings, and it should be understood that these directional terms are relative concepts, which are used for descriptive and clarity with respect thereto and which may be varied accordingly with respect to the orientation in which the structure is disposed.

For convenience of understanding, the following description will explain and describe related technical terms related to the embodiments of the present application.

Parallel: the parallelism defined by the embodiments of the present application is not limited to absolute parallelism, and the definition of parallelism is understood to be substantially parallel, allowing for non-absolute parallelism due to factors such as assembly tolerances, design tolerances, structural flatness, etc.

The existing double-motor assembly has the problems of oversized axial dimension, difficult overall layout of the whole automobile and poor adaptability of a chassis of the automobile when the whole automobile is arranged. The embodiment of the application provides a distributed power assembly, which comprises a middle partition plate, two motors and at least one rotary transformer, wherein the middle partition plate is used for respectively and rotatably connecting motor shafts of the two motors through two motor bearings, the motors are used for converting electric energy into mechanical energy, the middle partition plate comprises two end faces, the orientations of the two end faces are opposite, and one end face is used for fixing a stator of the rotary transformer and one motor bearing, wherein the two end faces are respectively connected with the motor shafts of the two motors in a rotating way, and the two end faces are opposite to each other in a reverse direction: along the motor radial, the internal diameter of the stator of a resolver is greater than the external diameter of a motor bearing, the clearance between the stator of a resolver and the outer ring of a motor bearing is used for accommodating the rotor of a resolver and one end of a motor shaft in transmission connection with a motor bearing, so that the motor shaft and the motor bearing can be accommodated in the clearance, the resolver and the motor bearing can be radially arranged along the motor, the sum of the axial dimensions occupied by the motor bearing and the resolver can be reduced, the axial dimension of the motor shaft can be shortened, the axial dimension of the motor and the power assembly can be reduced, the arrangement inside the power assembly is compact and regular, and the whole vehicle layout is facilitated to be optimized.

The power assembly provided by the embodiment of the application can be applied to electric vehicles.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an electric vehicle 1 according to an embodiment of the application, in one embodiment, the electric vehicle 1 includes a vehicle body 20, wheels 40, a battery pack 30, and a power assembly 10, wherein the power assembly 10 is fixed to the vehicle body 20, and the power assembly 10 is configured to receive electric energy provided by the battery pack 30 to drive the wheels 40 of the electric vehicle 1.

In the embodiment of the present application, the powertrain 10 includes two motors 100 and two reducers 200, the two motors 100 are located between the two reducers 200 to form a U-shaped distributed powertrain, the motors of the powertrain 10 are axially arranged between two front wheels or two rear wheels, and one of the reducers 200 is axially arranged between one motor 100 and one wheel along the motor shaft. However, the existing dual-motor 100 power assembly 10 generally occupies a relatively large space in the axial direction, which is particularly obvious in vehicles with front and rear dual-drive, front and rear four-drive and the like, so that the axial dimension of the power assembly 10 is too large, which results in difficult overall layout and poor adaptability of the chassis of the vehicle.

In the embodiment of the application, the miniaturization design of the power assembly can be realized by improving the power assembly, the space occupied by the power assembly in the motor shaft direction is effectively reduced, and the whole vehicle layout is optimized.

The powertrain 10 provided by the embodiment of the present application will be described in detail.

Referring to fig. 2, fig. 2 is a schematic structural diagram of a powertrain 10 according to an embodiment of the present application, in which the powertrain 10 includes two motors 100, two reducers 200, and a motor controller 300, the two motors 100 are arranged between the two reducers 200, and the motor controller 300 is fixed to the motors 100. Each speed reducer 200 is used for being in driving connection with one motor 100, motor windings in the two motors 100 are connected with a motor controller 300 (not shown), the motor controller 300 is used for receiving direct current transmitted by the battery pack 30 and converting the direct current into alternating current, the alternating current is provided for the motor windings in the two motors 100, and the motor windings receive the alternating current and then drive a motor shaft 110 in the motor 100 to rotate, and the motor shaft 110 drives wheels 40 to rotate through the speed reducer 200.

Referring to fig. 3, 4 and 5, fig. 3 is a sectional view of a power assembly 10 according to an embodiment of the present application, fig. 4 is a partial sectional view of the power assembly 10 according to an embodiment of the present application, fig. 5 is an enlarged partial view of a portion M of the power assembly 10 shown in fig. 4, in an embodiment, the power assembly 10 further includes a middle spacer 400 and at least one rotary transformer 130, the middle spacer 400 is used to rotatably connect the motor shafts 110 of the two motors 100 through the two motor bearings 120, respectively, the middle spacer 400 includes two end surfaces 401, the two end surfaces 401 face opposite, one end surface 401 is used to fix the stator of one rotary transformer 130 and one motor bearing 120, wherein an inner diameter of the stator of one rotary transformer 130 is larger than an outer diameter of one motor bearing 120 along a motor radial direction R, and a gap between the stator of one rotary transformer 130 and an outer ring of one motor bearing 120 is used to accommodate one end of one motor shaft 110 to which the rotor of one rotary transformer 130 and one motor bearing 120 are drivingly connected.

In the embodiment of the present application, the power assembly 10 includes two motors 100 and two reducers 200, and each motor 100 is arranged adjacent to one reducer 200 along the motor axial direction O, so that the power assembly 10 has high integration, can reduce the volume and the cost, and improves the power density, thereby being beneficial to adapting to the performance requirements of the electric vehicle field on the power assembly 10. Wherein the motor 100 is used for converting electric energy into mechanical energy and transmitting the mechanical energy to the decelerator 200, specifically, in one embodiment, the motor 100 includes a motor winding 140, a motor stator, a motor rotor 150 and a motor shaft 110, the motor winding 140 receives interaction between alternating magnetic flux generated by the electric energy and permanent magnetic flux generated by the motor rotor 150, such that the motor rotor 150 rotates relative to the motor stator, the motor rotor 150 is fixedly connected with the motor shaft 110, such that the motor shaft 110 follows the motor rotor 150, the motor stator rotates relative to the motor shaft 110, such that the motor shaft 110 can rotate relative to the motor stator, the decelerator 200 includes a decelerator input shaft 210, and the motor shaft 110 is fixedly connected with the decelerator input shaft 210, such that torque can be transferred between the motor shaft 110 and the decelerator input shaft 210.

In the embodiment of the present application, two motors 100 are located at two sides of the middle partition 400 along the motor axial direction O, and in each motor 100, a motor shaft 110 is rotatably connected to the middle partition 400 through a motor bearing 120, and when the motor 100 operates, the motor shaft 110 can rotate relative to the middle partition 400. As shown in fig. 4, the rotary transformer 130 includes a stator and a rotor, the stator of the rotary transformer 130 is referred to as a rotary stator 131, the rotor of the rotary transformer 130 is referred to as a rotary rotor 132, as shown in fig. 5, one end face 401 of the middle partition 400 is fixedly connected with the rotary stator 131 and the motor bearing 120, the motor shaft 110 is in transmission connection with the rotary rotor 132 and the motor bearing 120, and the rotary transformer 130 is used for monitoring the rotation speed of the motor shaft 110 so as to control the rotation speed of the motor shaft 110, thereby improving the safety performance of the electric vehicle 1. The transmission connection means that power can be transmitted between the two components, and the motor shaft 110 and the rotary rotor 132 are in transmission connection, and the motor shaft 110 and the rotary rotor 132 can be relatively fixed along the radial direction of the motor through gears or splines so that the motor shaft 110 can drive the rotary rotor 132 to rotate, and the motor shaft 110 is in transmission connection with the motor bearing 120, and the motor shaft 110 is fixed with the outer ring of the motor bearing 120 to drive the outer ring of the motor bearing 120 to rotate.

In the embodiment of the present application, the inner diameter of the rotary stator 131 is larger than the outer diameter of the motor bearing 120 along the motor radial direction R, so that the inner side of the rotary stator 131 has enough space for accommodating the rotary stator 132 and a part of the motor shaft 110, providing preconditions for the arrangement of the rotary stator 131 and the motor bearing 120 along the motor radial direction R. A gap exists between the rotary stator 131 and the outer ring of the motor bearing 120 along the radial direction R of the motor, and the gap is used for the rotary rotor 132 and the motor shaft 110 to pass through, or is used for avoiding the rotary rotor 132 and the motor shaft 110, and the inner diameter of the rotary stator is larger than the outer diameter of the motor bearing 120, so that the arrangement of the rotary transformer 130 and the motor bearing 120 along the radial direction R of the motor is facilitated in the embodiment of the application. In one embodiment, the projection of the motor bearing 120 on the motor radial direction R and the projection of the resolver 130 on the motor radial direction R are at least partially overlapped, so that the volume of the resolver 130 and the motor bearing 120 occupying the motor axial direction O is smaller, the axial dimension of the motor shaft can be shortened, the axial dimensions of the motor 100 and the power assembly 10 are reduced, the miniaturized design of the power assembly 10 is facilitated, the inside of the power assembly 10 is compact and regular, and the arrangement and installation of the power assembly 10 on the whole vehicle are facilitated, so that the overall performance of the electric vehicle 1 is improved.

In the embodiment of the application, the power assembly 10 integrates the two motors 100 and the two reducers 200, so that the integration level is high, and the lightweight design of the power assembly 10 is facilitated. The motor bearing 120 and the rotary transformer 130 are respectively located on the inner surface and the outer surface of the motor shaft 110 and are arranged along the radial direction R of the motor, so that the axial dimension of the motor 100 is reduced, and an installation space is provided for arranging other devices, so that the power assembly 10 is internally compact in arrangement, and the power assembly 10 is further adapted to chassis of different vehicle types, and the overall layout of the whole vehicle is optimized.

With continued reference to fig. 3 and 4, in one embodiment, in at least one motor 100 of the two motors 100, the motor shaft 110 includes a motor shaft cavity 111 (as shown in fig. 3 and 4), the motor shaft cavity 111 extending through the motor shaft 110 along the motor axis O, the motor shaft cavity 111 for receiving a motor bearing 120 (as shown in fig. 4). The rotary transformer 130 is sleeved on the outer circumferential surface of the motor shaft 110 in the motor radial direction R (as shown in fig. 4). In motor radial direction R, the projection of motor bearing 120 at least partially overlaps the projection of resolver 130 (as shown in fig. 4).

In the embodiment of the present application, in at least one motor 100, a motor bearing 120 is accommodated in a motor shaft cavity 111 of a motor shaft 110, and illustratively, an outer ring of the motor bearing 120 is fixedly connected with the motor shaft 110, an inner ring of the motor bearing 120 is fixedly connected with a middle partition 400, and an outer ring of the motor bearing 120 is rotatably connected with the inner ring, so as to realize the rotational connection between the motor bearing 120 and the middle partition 400. The motor shaft cavity 111 is used for accommodating the motor bearing 120, and space in the motor shaft cavity 111 is fully utilized to reserve the outer surface of the motor shaft 110 for fixing the rotary transformer 130.

In the embodiment of the present application, the projection along the motor radial direction R refers to the projection along the motor radial direction R on the projection plane perpendicular to the motor radial direction R. Wherein, the projection plane along the projection of motor radial R is perpendicular with motor radial R. The projection of the motor shaft cavity 111 refers to the projection of the area surrounded by the cavity inner wall of the motor shaft cavity 111.

With continued reference to fig. 4, in one embodiment, in each motor 100 of the two motors 100, the motor shaft 110 includes a motor shaft cavity 111, the motor shaft cavity 111 extending through the motor shaft 110 in the motor axial direction O, the motor shaft cavity 111 for receiving the motor bearing 120. The rotary transformer 130 is sleeved on the outer circumferential surface of the motor shaft 110 along the motor radial direction R. In motor radial direction R, the projection of motor bearing 120 at least partially overlaps the projection of resolver 130. In the embodiment of the present application, the motor shaft cavities 111 of the two motors 100 of the power assembly 10 are used for accommodating the motor bearings 120, and the motor bearings 120 and the rotary transformer 130 are arranged along the motor radial direction R, which is beneficial to further reducing the occupied space of the two motors 100 in the motor axial direction O, and is convenient to realize the miniaturized design of the power assembly 10.

With continued reference to fig. 5, in one embodiment, a motor shaft 110 includes a bearing mounting section 113, the bearing mounting section 113 includes a groove 1131, a notch of the groove 1131 faces toward the intermediate plate 400, a recess direction of the groove 1131 faces away from the intermediate plate 400 along the motor axial direction O, the groove 1131 includes an inner circumferential surface 1131b and an outer circumferential surface 1131a, the inner circumferential surface 1131b is for driving connection with an outer ring of the motor bearing 120, and the outer circumferential surface 1131a is for fixing a rotor of the rotary transformer 130.

In the embodiment of the application, the groove 1131 in the motor shaft 110 is recessed away from the middle partition 400 along the motor axial direction O, and the area between the groove 1131 and the middle partition 400 can be used for accommodating the motor bearing 120, so that the motor bearing 120 is fixedly connected with the motor shaft 110 and the middle partition 400 respectively, specifically, the outer ring of the motor bearing 120 is fixedly connected with the inner peripheral surface 1131b of the groove 1131, the inner ring of the motor bearing 120 is fixedly connected with the middle partition 400, and the outer ring of the motor bearing 120 is rotatably connected with the inner ring, so that the motor bearing 120 can rotate along with the motor shaft 110 relative to the middle partition 400. The outer circumferential surface 1131a and the inner circumferential surface 1131b of the groove 1131 are arranged along the motor radial direction R, and the rotary transformer 132 is fixedly connected with the outer circumferential surface 1131a of the groove 1131, so that the rotary transformer 132 of the rotary transformer 130 can rotate along with the motor shaft 110 relative to the middle barrier 400. The motor bearing 120 and the rotary transformer 130 are located on two sides of the bearing mounting section 113 along the radial direction R of the motor, the motor bearing 120 and the rotary transformer 130 share the bearing mounting section 113, so that the axial length of the motor shaft 110 is reduced, the processing materials are reduced, the cost is reduced, and the axial length of the power assembly 10 is reduced.

With continued reference to fig. 4, in one embodiment, one end face 401 includes motor bearing retention tabs 420 and a rotational-change retention tab 410, the motor bearing retention tab 420 being configured to retain an inner race of one motor bearing 120 and the rotational-change retention tab 410 being configured to retain a stator of one resolver 130. In the motor radial direction R, the rotational-variation fixing protrusions 410 are arranged at intervals from the motor bearing fixing protrusions 420, and a motor bearing 120, a bearing mounting section 113, and a rotor and a stator of a rotary transformer 130 are sequentially arranged between the rotational-variation fixing protrusions 410 and the motor bearing fixing protrusions 420.

In the embodiment of the present application, along the motor axial direction O, the motor bearing fixing protrusion 420 protrudes toward the motor shaft 110, and the inner ring of the motor bearing 120 is fixed with the motor bearing fixing protrusion 420, so as to achieve the fixed connection between the inner ring of the motor bearing 120 and the middle partition 400. The inner and outer rings of the motor bearing 120 are fixed to the surface of the motor bearing fixing protrusion 420 and the inner circumferential surface 1131b of the groove 1131, respectively, so that the motor shaft 110 is rotatably coupled to the middle barrier 400 through the motor bearing 120. The motor bearing 120 is engaged with the motor bearing fixing protrusion 420 and the motor shaft 110 in the groove 1131 to reserve the outer circumferential surface 1131a of the groove 1131 for fixing the resolver 130, reducing the axial size of the motor shaft 110, and facilitating downsizing of the motor 100. The rotation fixing protrusions 410 and the motor bearing fixing protrusions 420 are arranged at intervals along the motor radial direction R, so that gaps between the rotation fixing protrusions 410 and the motor bearing fixing protrusions 420 can be used for sequentially accommodating the motor bearing 120, the bearing mounting section 113, the rotation rotor 132 and the rotation stator 131, and the rotation transformer 130 and the motor bearing 120 are compactly arranged along the motor radial direction R, which is beneficial to reducing the volume of the power assembly 10.

In the embodiment of the present application, along the motor axial direction O, the rotation fixing protrusion 410 protrudes toward the motor shaft 110, and the rotation stator 131 is fixed with the rotation fixing protrusion 410, so as to realize the fixed connection between the rotation stator 131 and the middle partition 400 of the rotation transformer 130, wherein the fixed connection between the rotation stator 131 and the rotation fixing protrusion 410 can be realized by means of screws, pins, buckles, and the like. The rotor 132 is fixed to the bearing mounting section 113 of the motor shaft 110, and when the motor shaft 110 rotates, the rotor 132 can rotate with the motor shaft 110 relative to the stator 131, and the stator 131 and the fixing protrusion 410 remain stationary. By providing the rotary fixing protrusions 410, the rotary stator 131 of the rotary transformer 130 is relatively fixed to the middle partition 400, so that the rotary transformer 130 can be ensured to work normally.

In one embodiment, both end surfaces 401 of the middle spacer 400 have motor bearing fixing protrusions 420 and rotation fixing protrusions 410, the rotation fixing protrusions 410 are spaced apart from the motor bearing fixing protrusions 420 in the motor radial direction R, and the motor bearing 120, the bearing mounting section 113, and the rotor and stator of one rotary transformer 130 are sequentially arranged between the rotation fixing protrusions 410 and the motor bearing fixing protrusions 420. In the embodiment of the present application, the end of the rotation fixing protrusion 410 of each motor 100 protruding toward the motor shaft 110 is fixedly connected with the rotation stator 131, which is advantageous for enhancing the structural stability of the rotary transformer 130.

With continued reference to fig. 5, in one embodiment, the motor bearing fixing protrusion 420 includes a bearing fixing section 421 and an axial limiting section 422, the bearing fixing section 421 is used to fix an inner ring of one motor bearing 120, and the axial limiting section 422 is used to abut one motor bearing 120 along the motor axial direction O, where, along the motor radial direction R, the outer diameter of the axial limiting section 422 is greater than the outer diameter of the bearing fixing section 421. The bearing fixing section 421, the axial limiting section 422, and the other end face 401a of the middle barrier 400 are arranged in this order in the motor axial direction O. Along the motor axial direction O, the length of the axial limiting section 422 is smaller than the length of the rotational-change fixing protrusion 410, and the length of the rotational-change fixing protrusion 410 is smaller than the sum of the lengths of the bearing fixing section 421 and the axial limiting section 422.

In the embodiment of the application, the bearing fixing section 421 and the axial limiting section 422 of one end face 401 and the other end face 401a are arranged along the motor axial direction O, the inner ring of the motor bearing 120 is fixed on the bearing fixing section 421, and the outer diameter of the axial limiting section 422 along the motor radial direction R is larger than the outer diameter of the bearing fixing section 421 along the motor radial direction R, so that the end face of the axial limiting section 422 facing the motor bearing 120 along the motor axial direction O can be used for limiting the motor bearing 120, the motor bearing 120 is prevented from axial displacement, and the normal operation of the motor 100 is ensured.

In the embodiment of the present application, the length of the rotation fixing protrusion 410 in the motor axial direction O is greater than the length of the axial limiting section 422 in the motor axial direction O, and the length of the axial limiting section 422 is relatively smaller, so that the space occupied by the middle partition 400 in the motor axial direction O can be reduced, which is beneficial to shortening the axial dimensions of the motor 100 and the power assembly 10. The length of the rotation fixing protrusion 410 is relatively large, so that the axial distance between the rotation fixing protrusion 410 and the rotation stator 131 is reduced, which is advantageous for reducing the operation difficulty of fixing the rotation stator 131 and the rotation fixing protrusion 410, and the length of the rotation fixing protrusion 410 is relatively large, so that a sufficient gap is provided between the rotation fixing protrusion 410 and the motor bearing fixing protrusion 420 for accommodating the bearing mounting section 113 of the motor shaft 110. The sum of the lengths of the bearing fixing section 421 and the axial limiting section 422 is greater than the length of the rotational-change fixing protrusion 410, which is advantageous for providing an installation space for the motor bearing 120 in the motor axial direction O.

With continued reference to fig. 4, in one embodiment, each motor 100 further includes a motor housing 700 and motor windings 140, the motor housings 700 of the two motors 100 are arranged on both sides of the middle partition 400 along the motor axial direction O, the motor housing 700 is used to accommodate the motor shaft 110, the motor bearing 120 and the resolver 130, one motor housing 700, one motor winding 140 and the rotation fixing protrusion 410 are arranged on the same side of one end face 401, wherein the distance between the rotation fixing protrusion 410 and one motor housing 700 along the motor radial direction R is greater than the length of one motor winding 140, and the gap between the rotation fixing protrusion 410 and one motor housing 700 along the motor radial direction R is used to accommodate a portion of one motor winding 140.

In the embodiment of the present application, the middle partition 400 is arranged between two motor housings 700 along the motor axial direction O, and the motor housings 700 are used for accommodating the motor shaft 110, the motor bearing 120 and the rotary transformer 130 therein, so that the middle partition 400 is reused by the two motors 100, which is beneficial to reducing materials and cost. The motor winding 140 is used for receiving alternating current, the rotation fixing protrusion 410 and the motor housing 700 are arranged at intervals along the motor radial direction R, the distance between the motor winding 140 and the motor housing 700 along the motor radial direction R is smaller than the distance between the rotation fixing protrusion 410 and the motor housing 700 along the motor radial direction R, so that the gap between the rotation fixing protrusion 410 and the motor housing 700 along the motor radial direction R can be used for accommodating the motor winding 140, the utilization rate of the radial space is improved, the sum of the axial lengths of the motor winding 140 and the rotation fixing protrusion 410 can be shortened, and the axial length of the power assembly can be reduced.

In one embodiment, a motor bearing 120, a resolver 130, and a motor winding 140 are arranged in this order along the motor radial direction R. In the motor radial direction R, the projection of one resolver 130 and the projection of one motor winding 140 partially overlap.

In the embodiment of the present application, the motor bearing 120 and the resolver 130 are arranged along the motor radial direction R, so that the resolver 130 can be accommodated between the motor bearing 120 and the motor winding 140 along the motor radial direction R, and the projection of the resolver 130 along the motor radial direction R overlaps with the projection of the motor winding 140 along the motor radial direction R, so that the space of the motor 100 in the motor radial direction R is fully utilized, the axial dimension of the whole motor 100 is shortened, and the volume of the power assembly 10 is reduced.

Referring to fig. 4 and 5, in one embodiment, a motor shaft 110 further includes a rotor mounting section 112, and an outer circumferential surface of the rotor mounting section 112 is used for fixing a motor rotor 150, wherein the rotor mounting section 112 and a bearing mounting section 113 are coaxially connected, and the bearing mounting section 113 is arranged between the rotor mounting section 112 and an intermediate barrier 400 along a motor axis direction O. The outer diameter of the bearing mounting section 113 is larger than the outer diameter of the rotor mounting section 112 in the motor radial direction R.

In the embodiment of the application, the motor rotor 150 is fixed on the outer peripheral surface of the rotor mounting section 112, and the rotor mounting section 112 is coaxially connected with the bearing mounting section 113, so that the coaxiality of the motor rotor 150 and the motor bearing 120 is improved, and the transmission stability of the motor 100 is improved. The outer diameter of the bearing mounting section 113 is larger than the outer diameter of the rotor mounting section 112, and the structural strength of the motor shaft 110 is improved on the premise that the motor shaft 110 can accommodate the motor bearing 120. In addition, the smaller outer diameter of the rotor mounting section 112 reduces the volume of the motor 100 in the motor radial direction R, facilitating downsizing of the motor 100.

With continued reference to FIG. 4, in one embodiment, the rotor mounting section 112 includes an inner cavity, and the recess of the bearing mounting section 113 and the inner cavity of the rotor mounting section 112 are in communication to form the motor shaft cavity 111, with the inner diameter of the bearing mounting section 113 being greater than the inner diameter of the rotor mounting section 112. In an embodiment of the present application, the inner diameter of the bearing mounting section 113 is larger than the inner diameter of the rotor mounting section 112, such that there is more space within the motor shaft 110 for accommodating the motor bearing 120 and other structures, which, illustratively, in one embodiment, include structures for fixedly connecting the inner race of the motor bearing 120 with the septum 400. On this basis, if the outer diameter of the bearing mounting section 113 is set to be equal to or smaller than the outer diameter of the rotor mounting section 112, the thickness of the motor shaft 110 in the motor radial direction R will be greatly reduced. In one embodiment, the inner diameter of the bearing mounting section 113 is greater than the outer diameter of the rotor mounting section 112.

In one embodiment, the bearing mounting section 113 and the rotor mounting section 112 are integrally formed. The embodiment of the application is beneficial to improving the overall structural strength of the motor shaft 110.

In one embodiment, the motor shaft 110 of each motor 100 includes a rotor mounting section 112 and a bearing mounting section 113, the bearing mounting section 113 having an outer diameter greater than the outer diameter of the rotor mounting section 112 and the bearing mounting section 113 having an inner diameter greater than the inner diameter of the rotor mounting section 112. In the embodiment of the present application, the inner cavity of the bearing mounting section 113 of each motor 100 is larger, so that the motor bearing 120 can be better accommodated, and the motor bearing 120 can also better play a role in supporting the motor shaft 110. The smaller outer diameter of the rotor mounting section 112 of each motor 100 reduces the volume of the motor 100 in the motor radial direction R, facilitating downsizing of the motor 100.

With continued reference to fig. 4, in one embodiment, both motors 100 include motor rotors 150, and in either of the two motors 100, in the motor axial direction O, the distance between the rotary transformers 130 in the two motors 100 is less than the distance between the motor rotors 150 in the two motors 100, and the distance between the rotary transformers 130 in the two motors 100 is less than the distance between the motor bearings 120 in the two motors 100.

In the embodiment of the present application, two motors 100 are arranged on both sides of the middle barrier 400 in the motor axial direction O. In the motor axial direction O, in either one of the two motors 100, the resolver 130 is closer to the middle separator 400 than the motor rotor 150, and in both motors 100, the distance between the two resolvers 130 is smaller than the distance between the two motor rotors 150, smaller than the distance between the two motor bearings 120, since the resolver fixing protrusion 410 protrudes from the middle separator 400 toward the motor rotor 150, the embodiment of the present application is advantageous in reducing the operation difficulty and the processing cost of fixedly connecting the resolver 130 with the resolver fixing protrusion 410 and the middle separator 400. Meanwhile, the motor rotor 150 and the motor bearing 120 are compactly arranged along the motor axial direction O, which is advantageous in reserving an installation space for the resolver 130.

With continued reference to fig. 4, in one embodiment, the distance between the motor shafts 110 in the two motors 100 is less than the distance between the rotary transformers 130 in the two motors 100 along the motor axis O, and the distance between the motor shafts 110 in the two motors 100 is less than the distance between the motor bearings 120 in the two motors 100. In the embodiment of the present application, in the two motors 100, the distance between the two motor shafts 110 is smaller than the distance between the two rotary transformers 130 and the distance between the two motor bearings 120 along the motor axial direction O, which is equivalent to that the motor shafts 110 are closer to the middle partition 400 than the rotary transformers 130 and the motor bearings 120, and the motor bearings 120 and the rotary transformers 130 are respectively fixed on the inner and outer peripheral surfaces of the motor shafts 110, so that the embodiment of the present application can increase the installation space of the motor shafts 110 along the motor axial direction O and reduce the installation difficulty of the motor bearings 120 and the rotary transformers 130.

With continued reference to fig. 4, along motor axis O, the projections of resolver 130 in both motors 100 at least partially overlap, and the projections of motor bearings 120 in both motors 100 at least partially overlap. The embodiment of the application is beneficial to improving the arrangement regularity of the two motors 100. In one embodiment, along motor axis O, the projections of resolver 130 in both motors 100 overlap entirely and the projections of motor bearings 120 in both motors 100 overlap entirely. In the embodiment of the present application, the rotary transformer 130 and the motor bearing 120 in the two motors 100 form a symmetrical structure with respect to the partition 400, which is advantageous for achieving dynamic balance of the two motors 100.

In the embodiment of the present application, the projection along the motor axial direction O refers to the projection along the motor axial direction O on the projection plane perpendicular to the motor axial direction O. Wherein, the projection plane along the projection of motor axial direction O is perpendicular with motor axial direction O.

With continued reference to fig. 5, in one embodiment, the other end face 401a is used to secure the stator of the other rotary transformer 130a and the other motor bearing 120a, wherein the motor bearing securing protrusion 420a of the other end face 401a is used to secure the inner race of the other motor bearing 120 a. The rotational-change fixing projection 410a of the other end face 401a is used to fix the stator of the other resolver 130 a. The other end face 401a and the motor bearing fixing boss 420 and the rotation fixing boss 410 of one end face 401 are identical in structure and arrangement.

In the embodiment of the present application, the inner rings of the other rotary stator 131a and the other motor bearing 120a are fixed to the other end face 401a, and the inner rings of the other rotary stator 131a and the other motor bearing 120a are kept stationary with the middle barrier 400 when the motor is operated. The two end surfaces 401 and 401a of the middle partition plate 400 along the motor axial direction O form a symmetrical structure, so that the internal layout of the power assembly 10 can be optimized, and the dynamic balance design of the two motors 100 can be realized.

With continued reference to fig. 4, in one embodiment, the motor 100 further includes a brush 160, the brush 160 being configured to electrically connect with the middle spacer 400, the motor shaft 110 including a motor shaft cavity 111, the motor shaft cavity 111 being configured to receive and hold the brush 160, a motor bearing 120, and a rotary transformer 130 arranged in sequence along the motor radial direction R.

In the embodiment of the present application, the brush 160 is used for grounding, the brush 160 is in contact with and electrically connected to the middle partition 400, and the brush 160 is located in the motor shaft cavity 111, so that the voltage generated by the motor shaft 110 is grounded, a grounding path is formed in the motor 100, and the accumulated charges can be conducted to the ground by the brush 160. In addition, since the brush 160 and the motor bearing 120 are both in contact with the middle barrier 400, the brush 160 can also prevent the motor bearing 120 from being corroded electrically, and ensure the motor bearing 120 to work normally. The brush 160 is accommodated in the motor shaft cavity 111, and the space in the motor shaft cavity 111 can be fully utilized, so that the volume of the motor 100 can be reduced. The brushes 160 are arranged on the inner side of the motor bearing 120, which is away from the rotary transformer 130, along the radial direction R of the motor, so that the brushes 160 can be opposite to one end face 401 of the middle partition 400 along the axial direction O of the motor, which is beneficial to shortening the distance between the brushes 160 and the middle partition 400 and improving the electrical connection stability of the brushes 160 and the middle partition 400.

In one embodiment, each of the two motors 100 includes a brush 160, the brush 160 being located within the motor shaft cavity 111, the brush 160 being electrically connected to the septum 400. The embodiment of the application is beneficial to further preventing devices in the motor 100 from being corroded electrically and enhancing the safety performance of the motor 100.

Referring to fig. 4 and 6 in combination, fig. 6 is a schematic structural diagram of a brush 160 according to an embodiment of the present application, in one embodiment, the brush 160 includes a brush fixing portion 161 and conductive bristles 162 (as shown in fig. 4 and 6), and a motor shaft cavity 111 is used to accommodate and fix the brush fixing portion 161 (as shown in fig. 4 and 6), wherein a length of the conductive bristles 162 along the motor axial direction O is greater than or equal to a distance between the brush fixing portion 161 and a motor bearing fixing protrusion 420 in one end face 401. The brush fixing portion 161, the conductive brush 162, and one motor bearing 120 are arranged in this order along the motor axial direction O.

In the embodiment of the present application, the length of the conductive bristle 162 in the motor axial direction O is greater than or equal to the distance between the brush fixing portion 161 and the motor bearing fixing protrusion 420, so that the conductive bristle 162 in the brush 160 needs to be in contact with the middle barrier 400 to achieve grounding. Here, the distance between the brush fixing portion 161 and the motor bearing fixing protrusion 420 refers to the distance between the end surface of the brush fixing portion 161 facing the motor bearing fixing protrusion 420 in the motor axial direction and the motor bearing fixing protrusion 420. Along the motor axial direction O, the brush fixing portion 161 is located at one side of the conductive brush hair 162 away from the middle partition 400, and the brush 160 is fixedly connected with the inner wall of the motor shaft cavity 111 through the brush fixing portion 161, so that the structural stability of the brush 160 is improved, obvious displacement of the brush 160 relative to the motor shaft 110 along the motor axial direction O is avoided, and the stable grounding effect of the brush 160 is ensured.

Referring to fig. 3, 7 and 8 in combination, fig. 7 is a partial cross-sectional view of a powertrain 10 according to an embodiment of the present application, and fig. 8 is a partial structural schematic view of the powertrain 10 according to an embodiment of the present application, in which each of the reducers 200 includes a reducer input shaft 210, an input shaft driving gear 220 and a reducer end plate 230 (as shown in fig. 7), the reducer input shaft 210 is rotatably connected to the reducer end plate 230, the input shaft driving gear 220 is fixed to the reducer input shaft 210 (as shown in fig. 7 and 8), and in which the input shaft driving gear 220, the reducer end plate 230, the rotary transformer 130 and the motor rotor of the motor 100 are sequentially arranged at intervals (as shown in fig. 3) in the adjacent arrangement of the reducer 200 and the motor 100 along the motor axial direction O. Each reduction gear 200 further includes a countershaft 240, a countershaft driven gear 250, and a countershaft bearing 260 (shown in fig. 7 and 8), the countershaft driven gear 250 being secured to the countershaft 240 (shown in fig. 7 and 8), the countershaft driven gear 250 meshing with the input shaft drive gear 220, the countershaft 240 being rotatably connected with the reduction gear end plate 230 by the countershaft bearing 260 with the countershaft axial direction being parallel to the motor axial direction O. In one reduction gear 200, at least one end face of the intermediate shaft driven gear 250 includes a groove structure 251 (as shown in fig. 7 and 8) in the motor axial direction O, the groove structure 251 having a groove opening diameter larger than an outer diameter of the intermediate shaft bearing 260 (as shown in fig. 7 and 8), the groove structure 251 being for accommodating at least part of the intermediate shaft bearing 260 (as shown in fig. 7 and 8).

In the embodiment of the present application, the reducer input shaft 210 is fixedly connected with the motor shaft 110, the reducer input shaft 210 can rotate synchronously with the motor shaft 110, the input shaft driving gear 220 is fixed on the reducer input shaft 210, the intermediate shaft driven gear 250 is fixed on the intermediate shaft 240, and the input shaft driving gear 220 is meshed with the intermediate shaft driven gear 250, so that the reducer input shaft 210 can drive the intermediate shaft 240 to rotate, i.e. torque can be sequentially transmitted among the motor shaft 110, the reducer input shaft 210 and the intermediate shaft 240.

In an embodiment of the present application, the reducer input shaft 210 is rotatably coupled to the reducer end plate 230, and the reducer input shaft 210 is capable of rotating relative to the reducer end plate 230. The adjacently arranged decelerator 200 and motor 100 share a decelerator end plate 230, which realizes structural multiplexing in the power assembly 10, which is beneficial to reducing the material and processing cost of the power assembly 10. In the motor axial direction O, the resolver 130 is located on the side of the end plate 230 of the reducer away from the input shaft driving gear 220, and makes full use of the space between the motor stators in the two motors 100, so that the power assembly 10 is more compact in structure, and is beneficial to miniaturization of the power assembly 10.

In the embodiment of the present application, in the at least one reducer 200, at least one end surface of the intermediate shaft driven gear 250 includes a groove structure 251 along the intermediate shaft axial direction, the notch of the groove structure 251 is large enough to allow at least part of the intermediate shaft bearing 260 to be accommodated in the groove structure 251, and along the intermediate shaft radial direction, the projection of the groove structure 251 covers at least part of the projection of the intermediate shaft bearing 260, which corresponds to reducing the sum of the lengths of the intermediate shaft driven gear 250 and the intermediate shaft bearing 260 in the intermediate shaft axial direction, wherein the intermediate shaft axial direction is parallel to the motor axial direction R. If the groove structure 251 is not provided on the end face of the intermediate shaft driven gear 250 along the motor axial direction O, the intermediate shaft bearing 260 can only be provided near the end face of the intermediate shaft driven gear 250, which is not beneficial to reducing the axial length of the speed reducer 200 in the power assembly 10, and the power assembly 10 comprises two speed reducers 200, and the problem of too large axial length is further aggravated. The embodiment of the application is provided with the groove structure 251 to accommodate at least part of the intermediate shaft bearing 260, so that other structures can be arranged in the free space in the axial direction of the power assembly 10, the flexibility and compactness of the internal layout of the power assembly 10 are enhanced, the miniaturized design of the power assembly 10 is realized, and the whole vehicle layout is optimized.

In the drawings of the present application, the outer circumferential surfaces of the input shaft driving gear 220 and the intermediate shaft driven gear 250 are omitted, and the outer circumferential surfaces of the gears in the actual products have teeth, and the specific tooth shapes, tooth pitches, etc. can be designed according to the needs.

With continued reference to fig. 7, in one embodiment, each of the reducers 200 includes a countershaft driven gear 250 with a grooved structure 251, wherein in each of the reducers 200 the grooves of the grooved structure 251 of the countershaft driven gear 250 face the reducer end plate 230. The notches of the groove structures 251 in the two decelerator 200 are oppositely oriented. In an embodiment of the present application, by providing two countershaft driven gears 250 with recessed structures 251 in the powertrain 10, such that the two recessed structures 251 can each be used to receive at least a portion of the countershaft bearing 260, further reduction in the axial length of the powertrain 10 is facilitated. Wherein the notches of the groove structures 251 of the two intermediate shaft driven gears 250 face the two reducer end plates 230, respectively.

With continued reference to fig. 7, in one embodiment, each reducer 200 further includes an intermediate bearing mount 231, the reducer end plate 230 secures the intermediate shaft bearing 260 by the intermediate bearing mount 231, the intermediate bearing mount 231 is secured to the reducer end plate 230, the notch of the groove structure 251 faces the intermediate bearing mount 231, and the groove structure 251 is further configured to receive at least a portion of the intermediate bearing mount 231, wherein the intermediate shaft 240, the intermediate shaft bearing 260, and the intermediate bearing mount 231 are sequentially aligned along the intermediate shaft radial direction R. The reducer end plate 230, the intermediate bearing mount 231, and the groove structure 251 are arranged in this order along the intermediate shaft axis O.

In an embodiment of the present application, the notch of the groove structure 251 faces the intermediate bearing mount 231, and the intermediate bearing mount 231 is fixed to the reducer end plate 230, so that a space enclosed by the groove structure 251 and the intermediate bearing mount 231 can be used to accommodate at least part of the intermediate shaft bearing 260. Wherein, part of the intermediate shaft bearing 260 and part of the intermediate bearing fixing member 231 are both positioned in the groove structure 251, which is beneficial to reducing the axial length of the speed reducer 200, thereby realizing the miniaturized design of the power assembly 10 and optimizing the overall vehicle layout. In the radial direction R of the intermediate shaft, the intermediate shaft bearing 260 is located between the intermediate shaft 240 and the intermediate bearing fixing member 231, in the axial direction O of the intermediate shaft, the intermediate bearing fixing member 231 is located between the end plate 230 and the groove structure 251, and the intermediate bearing fixing member 231 performs axial limiting and radial limiting on the intermediate shaft bearing 260 at the same time, so that no axial or radial offset occurs in the intermediate shaft bearing 260, which is beneficial to the transmission stability of the speed reducer 200.

In one embodiment, the intermediate bearing mount 231 and the reducer end plate 230 are integrally formed. The embodiment of the application is beneficial to strengthening the connection relation between the intermediate bearing fixing piece 231 and the intermediate shaft bearing 260, so that the structural strength and the transmission stability of the speed reducer 200 can be effectively improved.

With continued reference to fig. 7 and 8, in one embodiment, in at least one reducer 200, the groove structure 251 includes a groove bottom wall 2511 and a groove peripheral wall 2512, the groove peripheral wall 2512 surrounding the outer periphery of the groove bottom wall 2511, wherein the groove bottom wall 2511, the countershaft bearing 260, and the reducer end plate 230 are arranged in sequence along the motor axis O. In the motor radial direction R, the intermediate shaft 240, the intermediate shaft bearing 260, the groove peripheral wall 2512, the input shaft drive gear 220 and the reduction gear input shaft 210 are arranged in this order. In the motor radial direction R, the groove peripheral wall 2512 partially overlaps with the projection of the intermediate shaft bearing 260.

In the embodiment of the present application, the slot peripheral wall 2512 is a part of the intermediate shaft driven gear 250, the outer surface of the slot peripheral wall 2512 is used for meshing with the input shaft driven gear 220, the intermediate shaft driven gear 250 and the input shaft driven gear 220 are respectively sleeved on the intermediate shaft 240 and the speed reducer input shaft 210, and the intermediate shaft 240, the intermediate shaft bearing 260, the slot peripheral wall 2512, the input shaft driven gear 220 and the speed reducer input shaft 210 are sequentially arranged in the radial direction R of the motor, so that the transmission between the input shaft driven gear 220 and the intermediate shaft driven gear 250 is facilitated, and the transmission stability of the speed reducer 200 is improved. Meanwhile, since part of the intermediate shaft bearing 260 is located in the groove structure 251, the intermediate shaft bearing 260 is located between the intermediate shaft 240 and the groove peripheral wall 2512 along the motor radial direction R, and the projection part of the groove peripheral wall 2512 and the intermediate shaft bearing 260 is overlapped, so that the arrangement of the internal devices of the speed reducer 200 is regular and compact, and the overall layout of the power assembly 10 is facilitated.

With continued reference to fig. 7 and 8, in one embodiment, the slot bottom wall 2511, the intermediate bearing mount 231 and the reducer end plate 230 are arranged in that order along the motor axis O, with the intermediate bearing mount 231 being secured to the reducer end plate 230. In the motor radial direction R, the intermediate shaft 240, the intermediate shaft bearing 260, the intermediate bearing mount 231, the groove peripheral wall 2512, the input shaft drive gear 220, and the reduction input shaft 210 are arranged in this order. In the motor radial direction R, the intermediate bearing mount 231 at least partially overlaps with the projection of the slot peripheral wall 2512.

In the embodiment of the present application, the intermediate shaft 240 is rotatably connected to the end plate 230 of the speed reducer through an intermediate shaft bearing 260, specifically, an inner ring of the intermediate shaft bearing 260 is fixedly connected to the intermediate shaft 240, an outer ring of the intermediate shaft bearing 260 is fixedly connected to an intermediate bearing fixing member 231, the intermediate bearing fixing member 231 is fixedly connected to the end plate 230 of the speed reducer, and an inner ring and an outer ring of the intermediate shaft bearing 260 are rotatably connected to each other, so that the intermediate shaft 240 can rotate relative to the end plate 230 of the speed reducer. The groove structure 251 is notched toward the intermediate bearing mount 231, and the groove structure 251 is also configured to receive at least a portion of the intermediate bearing mount 231 such that the intermediate bearing mount 231 at least partially overlaps with a projection of the groove peripheral wall 2512 in the motor radial direction R. At least part of the intermediate shaft bearing 260 and at least part of the intermediate bearing mount 231 are both located within the groove structure 251, so that in the motor radial direction R, the intermediate shaft bearing 260 and the intermediate bearing mount 231 are located between the intermediate shaft 240 and the groove peripheral wall 2512.

With continued reference to fig. 7, in one embodiment, one of the end faces of the intermediate driven gear 250 includes a groove structure 251 along the motor axis O, and the other end face of the intermediate driven gear 250 is planar. In the embodiment of the application, the other end face of the intermediate shaft driven gear 250 is a plane, which is beneficial to reducing the processing difficulty and the processing procedure.

Referring to fig. 9, fig. 9 is a partial cross-sectional view of a power assembly 10 according to an embodiment of the present application, in one embodiment, one of the end faces of the intermediate driven gear 250 includes a groove structure 251 along the axial direction O of the motor, the other end face of the intermediate driven gear 250 includes a shallow slot 252, the shallow slot 252 faces away from the slot of the groove structure 251, and the depth of the groove structure 251 along the axial direction O of the motor is greater than the depth of the shallow slot 252 along the axial direction O of the motor. In the embodiment of the present application, the other end surface of the intermediate shaft driven gear 250 includes a shallow slot 252, and the shallow slot 252 and the slot opening of the groove structure 251 face opposite to each other, so that the shallow slot 252 can provide a clearance space for other components, and wear is reduced. In the embodiment of the present application, the shallow slot 252 is designed on the other end face of the gear, which is also beneficial to reducing the weight of the gear and the weight of the power assembly 10.

With continued reference to fig. 8, in one embodiment, the reducer 200 further includes a countershaft drive gear 270, a reducer output shaft 280, and an output shaft driven gear 290, where the countershaft drive gear 270 is configured to drivingly connect the reducer output shaft 280, and the reducer end plate 230, the countershaft bearing 260, the countershaft driven gear 250, and the countershaft drive gear 270 are sequentially arranged along the motor axis O, and the countershaft drive gear 270 is meshed with the output shaft driven gear 290, and a notch of the groove structure 251 of the countershaft driven gear 250 faces away from the countershaft drive gear 270.

In the embodiment of the present application, the intermediate shaft driven gear 250 and the intermediate shaft driving gear 270 are fixedly connected with the intermediate shaft 240, and the intermediate shaft driving gear 270 is in transmission connection with the speed reducer output shaft 280 through the output shaft driven gear 290, so that after the speed reducer input shaft 210 transmits torque to the intermediate shaft 240 through the intermediate shaft driven gear 250, the intermediate shaft 240 transmits torque to the speed reducer output shaft 280 through the intermediate shaft driving gear 270 and the output shaft driven gear 290, and the speed reducer output shaft 280 is used for driving wheels.

With continued reference to fig. 3, each motor 100 includes a motor housing 700, each decelerator 200 includes a decelerator housing 500 and a decelerator cover 600, the motor housing 700 is configured to accommodate the motor shaft 110, the motor bearing 120, and the resolver 130, the decelerator housing 500 is configured to accommodate the decelerator input shaft 210, the input shaft driving gear 220, the intermediate shaft 240, the intermediate shaft driven gear 250, and the intermediate shaft bearing 260, wherein, along the motor axis O, the decelerator housings 500 of the two decelerators 200 are arranged between the decelerator cover 600 of the two decelerators 200, the decelerator end plates 230 of the two decelerators 200 are arranged between the decelerator housings 500 of the two decelerators 200, and the motor housings 700 of the two motors 100 are arranged between the decelerator end plates 230 of the two decelerator 200. In each of the decelerator 200, the decelerator cover 600, the decelerator housing 500 and the decelerator end plate 230 are sequentially arranged in the motor axial direction O, and the decelerator cover 600 and the decelerator end plate 230 are fixed to the decelerator housing 500. In the motor axial direction O, the projection of at least one of the intermediate shaft 240, the intermediate shaft bearing 260, and the intermediate shaft driven gear 250 does not overlap with the projected portion of the motor housing 700.

In the embodiment of the present application, in each of the decelerator 200, the decelerator housing 500 is located between the decelerator cover 600 and the decelerator end plate 230 in the motor axial direction O, and the decelerator cover 600, the decelerator housing 500 and the decelerator end plate 230 together enclose a decelerator accommodating chamber, and the decelerator input shaft 210, the input shaft driving gear 220, the intermediate shaft 240, the intermediate shaft driven gear 250 and the intermediate shaft bearing 260 are located in the decelerator accommodating chamber, and the decelerator cover 600, the decelerator housing 500 and the decelerator end plate 230 function to protect and accommodate the internal components of the decelerator 200. In each motor 100, the motor housing 700 is located between the decelerator end plate 230 and the middle barrier 400 in the motor axial direction O, the decelerator end plate 230, the motor housing 700 and the middle barrier 400 enclose a motor accommodation chamber, and the motor shaft 110, the motor bearing 120 and the resolver 130 are located in the motor accommodation chamber, the decelerator end plate 230, the motor housing 700 and the middle barrier 400 function to accommodate and protect the internal components of the motor 100. Wherein, the reducer 200 and the motor 100 which are adjacently arranged share the reducer end plate 230, and the two motors 100 which are adjacently arranged share the middle partition plate 400, and a plurality of structures are repeatedly utilized in the power assembly 10, so that the material consumption can be reduced, the cost is lowered, and meanwhile, the structural layout is more compact, thereby being beneficial to the light weight design of the power assembly 10.

In the embodiment of the present application, instead of simply stacking the two motors 100 and the two reducers 200 along the motor axial direction O, in each reducer 200, at least part of the intermediate shaft 240 and at least part of the intermediate shaft bearing 260 are located in the region outside the projection of the motor housing 700 and the intermediate plate 400 along the motor axial direction O, so that the two reducers 200 and the two motors 100 form a U-shaped structure, when the intermediate shaft bearing 260 in the reducer 200 is accommodated in the groove structure 251 of the intermediate shaft driven gear 250, the axial length of the non-overlapping portion of the reducer 200 and the motor 100 along the axial direction can be reduced, so that the arrangement between the motor 100 and the reducer 200 is compact, which is beneficial for reducing the axial length of the whole power assembly 10.

In one embodiment, the two motor housings 700 and the middle barrier 400 are integrally formed together for improved overall structural strength.

In one embodiment, adjacent reducer housing 500 and reducer end plate 230 are of unitary construction for improved overall structural strength.

The distributed power assembly and the electric vehicle provided by the embodiment of the application are described in detail, and specific examples are applied to illustrate the principle and the embodiment of the application, and the description of the embodiment is only used for helping to understand the method and the core idea of the application; meanwhile, as those skilled in the art will have variations in specific embodiments and application scope in light of the ideas of the present application, the present description should not be construed as limiting the present application.

Claims

1. The utility model provides a distributed power assembly, its characterized in that, power assembly includes middle baffle, two motors and at least one resolver, the middle baffle is used for through two motor bearings respectively the rotation connect the motor shaft of two motors, the middle baffle includes two terminal surfaces, the orientation of two terminal surfaces is opposite to each other, one the terminal surface is used for fixed one resolver's stator and one motor bearing, wherein:

The inner diameter of the stator of the one rotary transformer is larger than the outer diameter of the one motor bearing along the radial direction of the motor, and a gap between the stator of the one rotary transformer and the outer ring of the one motor bearing is used for accommodating one end of the motor shaft in transmission connection with the rotor of the one rotary transformer and the one motor bearing.

2. The powertrain of claim 1, wherein the one motor shaft includes a bearing mounting section including a groove having a notch facing the septum, a direction of depression of the groove facing away from the septum along the motor axis, the groove comprising:

the inner peripheral surface is used for being in transmission connection with the outer ring of the motor bearing;

And an outer peripheral surface for fixing the rotor of the one resolver.

3. The powertrain of claim 2, wherein the one end face comprises:

The motor bearing fixing protrusion is used for fixing the inner ring of the motor bearing;

A rotational-change fixing protrusion for fixing the stator of the one resolver;

Along the motor radial direction, the rotary-change fixing protrusions are arranged at intervals with the motor bearing fixing protrusions, and the motor bearing, the bearing mounting section, the rotor and the stator of the rotary transformer are sequentially arranged between the rotary-change fixing protrusions and the motor bearing fixing protrusions.

4. The powertrain of claim 3, wherein the motor bearing retention tab includes a bearing retention section for securing an inner race of the one motor bearing and an axial stop section for axially abutting the one motor bearing along the motor, wherein:

The outer diameter of the axial limiting section is larger than the outer diameter of the bearing fixing section along the radial direction of the motor;

the bearing fixing section, the axial limiting section and the other end face of the middle partition plate are sequentially arranged along the axial direction of the motor;

along the motor axial direction, the length of axial spacing section is less than the length of the fixed protruding of changeing soon, the length of changeing soon is less than the fixed section of bearing with the length sum of axial spacing section.

5. The powertrain of claim 3, wherein each of the motors further comprises a motor housing and motor windings, the motor housings of the two motors being arranged on both sides of the intermediate partition plate in the motor axial direction, the motor housing for accommodating the motor shaft, the motor bearing, and the one resolver, one of the motor housings, one of the motor windings, and the rotational fixing boss being arranged on the same side of the one end face, wherein:

The distance between the rotational-change fixing protrusion and the one motor housing in the motor radial direction is greater than the length of the one motor winding, and the gap between the rotational-change fixing protrusion and the one motor housing in the motor radial direction is used for accommodating the portion of the one motor winding.

6. The powertrain of any one of claims 2-5, wherein the one motor shaft further comprises a rotor mounting section having an outer peripheral surface for securing a motor rotor, wherein:

The rotor mounting section and the bearing mounting section are coaxially connected, and the bearing mounting section is arranged between the rotor mounting section and the middle partition plate along the axial direction of the motor;

The outer diameter of the bearing mounting section is larger than the outer diameter of the rotor mounting section along the radial direction of the motor.

7. The powertrain of claim 5, wherein each of the motors further comprises a motor winding, one of the motor windings and the one motor bearing being arranged on a same side of the one end face, wherein:

The motor bearing, the rotary transformer and the motor winding are sequentially arranged along the radial direction of the motor;

Along the radial direction of the motor, the projection of the rotary transformer, the projection of the motor winding and the projection of the motor bearing are partially overlapped.

8. A powertrain according to claim 3, wherein the other one of the end faces is for fixing a stator of the other rotary transformer and the other one of the motor bearings is for driving a motor shaft of the other one of the motors, the other one of the end faces includes a motor bearing fixing protrusion and a rotational-change fixing protrusion, wherein:

the motor bearing fixing protrusion of the other end face is used for fixing the inner ring of the other motor bearing;

The rotary-variable fixing protrusion of the other end face is used for fixing the stator of the other rotary transformer;

the motor bearing fixing protrusions and the rotary fixing protrusions of the other end face and the one end face are identical in structure and arrangement.

9. The locomotion assembly of any one of claims 1-5, 7, 8, wherein the motor further comprises a brush for electrically connecting the middle barrier, the motor shaft comprising a motor shaft cavity comprising a brush fixing portion and conductive bristles, the motor shaft cavity for receiving and fixing the brush fixing portion, wherein:

The electric brush, the motor bearing and the rotary transformer are sequentially arranged along the radial direction of the motor;

Along the motor axial direction, the electric brush fixing part, the conductive brush hair and the motor bearing are sequentially arranged, and the length of the conductive brush hair along the motor axial direction is greater than or equal to the distance between the electric brush fixing part and the motor bearing fixing protrusion in one end face.

10. The powertrain of any one of claims 1-5, 7, 8, further comprising two retarders, each retarder comprising a retarder input shaft, an input shaft drive gear, and a retarder end plate, the retarder input shaft being rotatably connected to the retarder end plate, the input shaft drive gear being fixed to the retarder input shaft, wherein:

In the motor axial direction, in the adjacently arranged speed reducer and the motor, the input shaft driving gear, the speed reducer end plate and the motor rotor of the motor are sequentially arranged at intervals;

each speed reducer further comprises an intermediate shaft, an intermediate shaft driven gear and an intermediate shaft bearing, wherein the intermediate shaft driven gear is fixed on the intermediate shaft, the intermediate shaft driven gear is meshed with the input shaft driving gear, the intermediate shaft is rotationally connected with the speed reducer end plate through the intermediate shaft bearing, and the intermediate shaft axial direction is parallel to the motor axial direction;

In one of the reducers, at least one end face of the intermediate shaft driven gear includes a groove structure along the axial direction of the motor, the notch caliber of the groove structure is larger than the outer diameter of the intermediate shaft bearing, and the groove structure is used for accommodating at least part of the intermediate shaft bearing.

11. The powertrain of claim 10, wherein each of the reducers includes a countershaft driven gear with the grooved structure, wherein:

In each of the reducers, a notch of the groove structure of the intermediate shaft driven gear faces the reducer end plate;

The notches of the groove structures in the two reducers are oppositely oriented.

12. The powertrain of claim 10, wherein each of the decelerator further includes an intermediate bearing mount by which the decelerator end plate is secured to the intermediate shaft bearing, the intermediate bearing mount being secured to the decelerator end plate, the groove structure having a notch facing the intermediate bearing mount, the groove structure further adapted to receive at least a portion of the intermediate bearing mount, wherein:

The intermediate shaft, the intermediate shaft bearing and the intermediate bearing fixing piece are sequentially arranged along the radial direction of the intermediate shaft;

Along the axial direction of the intermediate shaft, the reducer end plate, the intermediate bearing fixing piece and the groove structure are sequentially arranged.

13. The powertrain of claim 10, wherein one of the end faces of the counter driven gear includes the groove structure along the motor axial direction, and the other end face of the counter driven gear is a plane; or alternatively

Along motor axial, one of them terminal surface of jackshaft driven gear includes groove structure, another terminal surface of jackshaft driven gear includes shallow mouth groove, shallow mouth groove with groove structure's notch orientation is dorsad, groove structure is followed motor axial's degree of depth is greater than shallow mouth groove is followed motor axial's degree of depth.

14. The powertrain of claim 10, wherein each of the motors includes a motor housing for housing the motor shaft, the motor bearing, and the resolver, and each of the reducers includes a reducer housing for housing the reducer input shaft, the input shaft drive gear, the countershaft driven gear, and the countershaft bearing, wherein:

Along the axial direction of the motor, the reducer casings of the two reducers are arranged between reducer cover plates of the two reducers, reducer end plates of the two reducers are arranged between reducer casings of the two reducers, and motor casings of the two motors are arranged between reducer end plates of the two reducers;

In each speed reducer, along the axial direction of the motor, the speed reducer cover plate, the speed reducer shell and the speed reducer end plate are sequentially arranged, and the speed reducer cover plate and the speed reducer end plate are both fixed on the speed reducer shell;

Along the motor axial direction, the projection of at least one of the intermediate shaft, the intermediate shaft bearing and the intermediate shaft driven gear does not overlap with the projection portion of the motor housing.

15. An electric vehicle comprising a vehicle body, wheels, a battery pack and a powertrain as claimed in any one of claims 1 to 14, the powertrain being secured to the vehicle body, a speed reducer of the powertrain being arranged between a wheel and one of the motors of the powertrain in the axial direction of the wheels, the motors of the powertrain being arranged to receive electrical energy provided by the battery pack and to convert the electrical energy into kinetic energy for transmission to the wheels via the speed reducer of the powertrain to drive the wheels.