CN116538245A - Wheel edge speed reducer, terminal driving device, assembly method and mining dump truck - Google Patents

Abstract

The invention discloses a hub reduction gear, a terminal driving device, an assembly method and a mining dump truck, wherein the hub reduction gear comprises a main shaft with a specific axial inner through hole, a hub, a gear ring component, a half shaft, a sun gear and a planetary component; the hub is sleeved on the outer peripheral surface of the main shaft, and a bearing and a sealing assembly are arranged between the opposite peripheral surfaces of the hub and the main shaft; the gear ring component is sleeved on a main shaft positioned in the hub, and the gear ring component and the main shaft are connected through a spline; the half shaft is inserted into the axial inner through hole of the main shaft; the sun gear and the half shaft are of a detachable assembly structure, and external splines of the sun gear and the half shaft are matched with internal splines of the sliding sleeve respectively; the planetary assembly is embedded in the gear ring assembly and connected with the hub, the outer part of the planetary assembly is meshed with the gear ring, and the inner part of the planetary assembly is meshed with the sun gear. The invention solves the problems of complex structure, low disassembly and assembly efficiency, poor maintenance, high manufacturing and using costs and the like of the traditional terminal driving device.

Description

Wheel edge speed reducer, terminal driving device, assembly method and mining dump truck

Technical Field

The invention relates to a wheel-side speed reducer and a terminal driving device, and belongs to the technical field of mining dumpers.

Background

The drive axle is a bearing and running functional component of the mining dump truck, and the terminal driving device is used as a part of the drive axle assembly for terminal transmission of torque. The mining dump truck has the advantages that the transportation working condition is particularly complex, the mining dump truck is operated on bumpy, muddy and rugged road conditions at all times, and even on non-road conditions, so that higher ground requirements are provided for the reliability of a terminal driving device, and the mining dump truck has to have better high-bearing, shock-resistant and fatigue-resistant characteristics, lower cost and excellent maintenance convenience. The traditional mining dump truck terminal driving speed reducing mechanism has complex structure, poor disassembly and assembly manufacturability, the sealing type adopts floating sealing, the cost is higher, and the lean requirements of production efficiency and cost control cannot be met. Therefore, it becomes necessary to develop an axle terminal driving device suitable for use under severe conditions.

The terminal driving device of the drive axle of the traditional mining dump truck mainly has the following problems:

the sun gear and the half shaft driven by the traditional mining dump truck terminal are made of the same material, the sun gear and the half shaft are integrally forged and formed, the manufacturing and processing cost is high, and when the sun gear has faults of abnormal abrasion, broken teeth and the like, the half shaft needs to be replaced synchronously, so that the maintenance cost is increased.

The integral half shaft driven by the traditional mining dump truck terminal is longer in size, higher in machining and manufacturing difficulty, and higher in precision control difficulty, efficiency and production cost, and the strength and hardness of gears and splines are considered, and heat treatment is needed after machining. Secondly, the longer semi-axle is easy to be stressed and deformed by heat, the bearing capacity is poor, and the failure rate is high.

The wet brake and the reduction gear box driven by the traditional mining dump truck terminal are isolated through floating seal, the purchase cost of the floating seal is high, meanwhile, the precision and the assembly process requirements of the floating seal on the mounting support are high, and the production and manufacturing cost is increased to a certain extent.

The independent wheel edge speed reducer is of a structure type, belongs to a disconnected axle driving device, and is connected with a bridge bag half axle through a transmission shaft.

Disclosure of Invention

According to the defects of the prior art, the invention discloses a hub reduction gear and a terminal driving device, and solves the problems of complex structure, low disassembly and assembly efficiency, poor maintenance, high manufacturing and using costs and the like of the traditional terminal driving device.

The invention is realized according to the following technical scheme:

in a first aspect, the present invention discloses a hub reduction gear comprising:

a spindle with a specific axial inner through hole;

the hub is sleeved on the outer peripheral surface of the main shaft, and a bearing and a sealing assembly are arranged between the opposite peripheral surfaces of the hub and the main shaft;

the gear ring assembly is sleeved on a main shaft positioned in the hub, and the gear ring assembly and the main shaft are connected through a spline;

the half shaft is inserted into the axial inner through hole of the main shaft;

the sun gear and the half shaft are of a detachable assembly structure, and external splines of the sun gear and the half shaft are matched with internal splines of the sliding sleeve respectively;

the planetary assembly is embedded in the gear ring assembly and connected with the hub, the outer part of the planetary assembly is meshed with the gear ring, and the inner part of the planetary assembly is meshed with the sun gear.

In some embodiments, the main shaft is sleeved with a supporting ring, and the end surface of the supporting ring is attached to the end surface of the main shaft; a sealing seat is arranged between the left inner hole of the hub and the opposite peripheral surface of the supporting ring, and sealing components are arranged on the outer peripheral surface of the sealing seat and in the inner hole of the sealing seat.

In some embodiments, the sealing member located on the outer peripheral surface of the sealing seat is an O-ring one, which is mounted in an annular groove on the outer peripheral surface of the sealing seat; the sealing component positioned in the inner hole of the sealing seat is provided with two framework seals, the two framework seals are arranged in the inner hole of the sealing seat back to back, and the end face of the side of the framework seal is attached to the end face of the spigot of the sealing seat.

In some embodiments, the first taper bearing is installed in the right inner hole of the hub, the second taper bearing is installed in the left inner hole of the hub, and the right end face of the sealing seat and the right end face of the supporting ring are both attached to the left end face of the second taper bearing.

In some embodiments, the ring gear assembly comprises:

a ring gear meshed with the planet gears in the planetary assembly;

the gear ring bracket is characterized in that an inner spline of a small end of the gear ring bracket is embedded and matched with an outer spline of the main shaft, and a cone bearing I is arranged between the small end and the opposite peripheral surface of the hub; the external spline of the big head end is embedded and matched with the internal spline of the gear ring and is tightly attached to the inner step surface of the gear ring;

and the pressing plates are uniformly and alternately arranged on the outer peripheral surface of the joint of the gear ring and the gear ring bracket, and are fixed on the gear ring by screw compression.

In some embodiments, a lock nut for adjusting the play of the bearing and locking the ring gear assembly is mounted on the external thread of the end of the spindle inside the hub.

In some embodiments, a plurality of grooves are circumferentially spaced at the edge of the locking nut, and the limit screw is threaded into the grooves and tightened onto the ring gear carrier of the ring gear assembly, thereby defining the position of the locking nut.

In some embodiments, the planetary assembly comprises:

the inner holes of the planetary gears are provided with a plurality of needle bearings, and the planetary gears are separated in groups through a spacing ring;

the planet carrier is provided with a plurality of planet wheel mounting holes, and an adjusting washer is attached to the planet wheel mounting holes;

the planetary shaft, the planet wheel, the space ring and the needle roller bearing which are assembled in an integrated way move into the planet carrier from the side, the planetary shaft is embedded into inner holes of the planet carrier and the planet wheel, a radial hole at the left end part of the planetary shaft is aligned with a radial hole on the planet carrier, the positioning pin is used for limiting the planetary shaft, and the planet wheel is meshed with the gear ring and the sun wheel.

In some embodiments, the limiting block is embedded in the light hole on the right side of the planet carrier, so that the clearance value between the sun gear and the limiting block is 0.6-mm-0.8 mm.

In some embodiments, the planet axle is internally vented with axial and radial oil passages for cooling of the roller bearing.

In some embodiments, a positioning ring for limiting the axial displacement of the sun gear is embedded between the sliding sleeve and the inner hole on the right side of the main shaft.

In some embodiments, the sun gear and the half shaft are assembled together by an axial long bolt.

In a second aspect, the invention discloses a terminal driving device, which comprises an axle housing, a wet brake and the wheel-side speed reducer; the end part of the main shaft is inserted into an inner hole of the axle housing, and is welded with the axle housing into a whole in a welding mode; the wet brake is mounted on the hub.

In a third aspect, the invention discloses a mining dump truck, which is provided with the wheel-side speed reducer; alternatively, the above-described terminal driving device is mounted.

In a fourth aspect, the present invention discloses a method for assembling a terminal driving device, comprising:

s1, connecting an axle housing and a main shaft of a terminal driving device into a whole in a welding mode;

s2, isolating the wet brake from the terminal driving device through bidirectional framework sealing;

s3, assembling a terminal driving device:

the gear ring and the gear ring bracket are connected through spline fit, and are limited axially through a pressing plate to form a gear ring assembly;

the assembled gear ring assembly is integrally embedded into the main shaft, the gear ring assembly is connected with the main shaft through a spline, and the locking nut is screwed in through external threads at the end part of the main shaft;

the sun gear is connected with the half shaft through a long bolt, and then the sliding sleeve slides in through the tail end of the half shaft, so that the internal spline of the sliding sleeve is meshed with the external spline of the half shaft and the external spline of the sun gear respectively;

the sun wheel, the long bolt, the half shaft and the sliding sleeve which are connected into a whole are inserted into an inner hole of the main shaft together;

the planetary assembly is embedded into the gear ring assembly, and the planetary assembly is mounted on the hub by using end cover screws, so that the planetary gear is meshed with the gear ring and the sun gear.

The invention has the beneficial effects that:

the invention solves the problems of complex structure, poor disassembly and assembly manufacturability, low disassembly and assembly efficiency, poor maintenance and protection performance, high manufacturing and using costs and the like of the traditional terminal driving device. The bidirectional framework sealing structure has relatively lower precision requirement on the sealing seat cavity, and can effectively reduce the processing and manufacturing cost. Meanwhile, due to the rectangular structural form of the framework seal, the framework is regular in shape and more convenient to install, the disassembly and assembly cost can be effectively reduced, the assembly failure rate is reduced, and the framework is more stable and reliable. And the sun gear and the half shaft are made of different materials according to the working condition requirements, so that the production cost is reduced. Meanwhile, the sun gear or the half shaft can be independently replaced according to actual abrasion conditions in the use process, so that the use cost is reduced, and the lean requirements of production efficiency and cost control are met.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. It is evident that the drawings in the following description are only examples, from which other drawings can be obtained by a person skilled in the art without the inventive effort.

In the drawings:

FIG. 1 is a block diagram of a wheel-side speed reducer of the present invention;

FIG. 2 is an enlarged view of part of I in FIG. 1;

FIG. 3 is an enlarged view of part II of FIG. 1;

FIG. 4 is a side view of the ring gear assembly;

FIG. 5 is a front view of the ring gear assembly;

FIG. 6 is a block diagram of a planetary assembly;

FIG. 7 is a planet axle cross-sectional view;

FIG. 8 is a perspective view of a planet axle;

FIG. 9 is a perspective view of a wheel-side speed reducer of the present invention;

FIG. 10 is a perspective view of a wheel-side speed reducer of the present invention;

fig. 11 is a structural view of a terminal driving device according to the present invention.

The attached drawings are identified: 1. spindle, 2, hub, 3, first conical bearing, 4, hub bolt, 5, hub nut, 6, gear ring component, 7, planetary component, 8, end cover screw, 9, stopper, 10, sun gear, 11, long bolt, 12, semi-axis, 13, first O-shaped ring, 14, seal seat, 15, second conical bearing, 16, skeleton seal, 17, support ring, 18, stop screw, 19, lock nut, 20, positioning ring, 21, sliding sleeve.

The ring gear assembly 6 includes: 6-1 gear ring, 6-2 gear ring bracket, 6-3 pressing plate and 6-4 screw.

The planetary assembly 7 includes: 7-1 planet carrier, 7-2 axial oil duct, 7-3 planet axle, 7-4O type circle two, 7-5 adjusting washer, 7-6O type circle three, 7-7 planet wheel, 7-8 space ring, 7-9 needle bearing, 7-10 locating pin, and 7-11 radial oil duct.

100-wheel-side speed reducer, 200-axle housing and 300-wet brake.

It should be noted that these drawings and the written description are not intended to limit the scope of the inventive concept in any way, but to illustrate the inventive concept to those skilled in the art by referring to the specific embodiments.

Description of the embodiments

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions in the embodiments will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention, and the following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

As shown in fig. 1, 2, 3, 9 and 10, the invention provides a hub reduction gear, which comprises a main shaft 1, a hub 2, a first conical bearing 3, a hub bolt 4, a hub nut 5, a gear ring assembly 6, a planetary assembly 7, an end cover screw 8, a limiting block 9, a sun gear 10, a long bolt 11, a half shaft 12, a first O-ring 13, a sealing seat 14, a second conical bearing 15, a framework seal 16, a supporting ring 17, a limiting screw 18, a locking nut 19, a positioning ring 20, a sliding sleeve 21 and the like.

As shown in fig. 4 and 5, the ring gear assembly 6 includes a ring gear 6-1, a ring gear carrier 6-2, a platen 6-3, and screws 6-4.

As shown in fig. 6, 7 and 8, the planetary assembly 7 comprises a planetary carrier 7-1, a second limiting block 7-2, a planetary shaft 7-3, a second O-ring 7-4, an adjusting washer 7-5, a third O-ring 7-6, a planetary wheel 7-7, a spacer ring 7-8, a needle bearing 7-9 and a positioning pin 7-10.

As shown in fig. 11, the present invention further provides a terminal driving device, which includes an axle housing 200, a wet brake 300, and the above-mentioned hub reduction gear 100; the end part of the main shaft 1 is inserted into an inner hole of the axle housing 200, and is welded with the axle housing 200 into a whole in a welding mode; the wet brake 300 is mounted on the hub 2.

The specific connection modes of the above components are given below:

as shown in fig. 1 to 11, the end of the main shaft 1 is inserted into the inner hole of the axle housing 200, and welded integrally with the axle housing 200 by means of circumferential welding. The supporting ring 17 is sleeved into the main shaft 1, and the end face of the supporting ring is attached to the end face of the main shaft 1. The first O-shaped ring 13 is arranged in an annular groove corresponding to the outer ring of the sealing seat 14, the 2 skeleton seals 16 are arranged in the inner hole of the sealing seat 14 back to back, and the end face of the skeleton seal side is attached to the end face of the spigot of the sealing seat 14. The hub bolts 4 are embedded into the corresponding mounting holes of the hub 2, the hub nuts 5 are screwed into the hub bolts 4, the first conical bearing 3 is mounted in the right inner hole of the hub 2, the second conical bearing 15 is mounted in the left inner hole of the hub 2, the sealing seat 14, the first O-shaped ring 13 and the 2 skeleton seals 16 are mounted in the left inner hole of the hub 2 together, and the right end face of the sealing seat 14 is attached to the left end face of the second conical bearing 15. The hub 2, the first conical bearing 3, the hub bolt 4, the hub nut 5, the first O-ring 13, the sealing seat 14, the second conical bearing 15 and the framework seal 16 are jointly embedded into the main shaft 1, so that the left end face of the second conical bearing 15 is attached to the right end face of the supporting ring 17, and the inner ring of the framework seal 16 is attached to the outer ring of the supporting ring 17. The O-shaped ring I13 and the framework seal 16 are used for isolating cooling oil in the wet brake 300 and gear oil in the wheel-side speed reducer 100, the framework seal 16 arranged back to back can remarkably improve the system pressure resistance, meanwhile, the cost is greatly reduced compared with that of a traditional floating seal, the precision and the assembly process requirements of the framework seal on an installation seat are relatively loose, the implementation of the bidirectional framework seal structure can effectively reduce the manufacturing cost and the maintenance cost, the disassembly and assembly convenience is good, and the working efficiency is effectively improved.

The external spline of the 6-2 gear ring bracket is embedded and matched with the internal spline of the 6-1 gear ring, the 6-2 gear ring bracket is compressed by a 6-3 pressing plate and a 6-4 screw, and then the assembled gear ring assembly 6 is integrally embedded into the main shaft 1, so that the left end face of the gear ring bracket 6-2 is attached to the right end face of the conical bearing I3. The lock nut 19 is screwed in through the external thread at the end part of the main shaft 1, the lock nut is firstly compressed by 800 N.m moment, then the torque is released and is re-added by 500 N.m moment, the hub 2 is synchronously rotated in the torque adding process, when the hub 2 can be manually rotated by 50 N.m moment, the rotation of the lock nut 19 is stopped, and the limit screw 18 is arranged in the mounting hole corresponding to the gear ring bracket 6-2 for limiting the position of the lock nut 19 and preventing loosening. The positioning ring 20 is embedded into an inner hole on the right side of the main shaft 1 and is used for limiting the axial displacement of the sun gear 10.

The sun gear 10 and the half shaft 12 are connected through the long bolt 11, and then the sliding sleeve 21 slides in through the tail end of the half shaft 12, so that the internal spline of the sliding sleeve 21 is meshed with the external spline of the half shaft 12 and the external spline of the sun gear 10 respectively. The sun gear 10, the long bolt 11, the half shaft 12 and the sliding sleeve 21 which are integrally connected are inserted into an inner hole of the main shaft 1, the left external spline of the half shaft 12 is meshed with the internal spline of the differential gear of the driving axle, and the left end face of the sliding sleeve 21 is attached to the right end face of the positioning ring 20.

And the second O-shaped ring 7-4 and the third O-shaped ring 7-6 are sequentially arranged in the annular groove corresponding to the planet carrier 7-1. According to the distance between the right end face of the sun gear 10 and the right end face of the hub 2 after assembly, the thickness value of the limiting block 9 is determined, the limiting block 9 with proper thickness is embedded into the unthreaded hole on the right side of the planet carrier 7-1, and the clearance value between the sun gear 10 and the limiting block 9 is ensured to be 0.6-0.8 mm. The needle roller bearing 7-9 is arranged in an inner hole of the planet wheel 7-7, and is isolated in groups through the spacing ring 7-8. The adjusting washers 7-5 are sequentially attached to the corresponding planet shaft mounting holes on the planet carrier 7-1 after being smeared with grease, and then the planet gears 7-7, the spacing rings 7-8 and the needle roller bearings 7-9 which are assembled into a whole are moved into the planet carrier 7-1 from the side, and the inner holes of the planet gears 7-7 are aligned with the corresponding planet shaft mounting holes on the planet carrier 7-1. The planetary shaft 7-3 is embedded into the inner holes of the planetary frame 7-1 and the planetary wheels 7-7, the radial holes at the left end part of the planetary shaft 7-3 are aligned with the radial holes on the planetary frame 7-1, and the planetary shaft 7-3 is limited by the positioning pins 7-10. The planet shaft 7-3 is internally provided with an axial oil duct 7-2 and a radial oil duct 7-11 for cooling the roller bearing 7-9. The planetary assembly 7 assembled into a whole is mounted on the hub 2 by using end cover screws 8, so that the planetary wheel 7-7 is meshed with the gear ring 6-1 and the sun wheel 10, and a planetary reduction mechanism is constructed.

From the above, the invention discloses a wheel-side speed reducer, a terminal driving device, an assembly method and a mining dump truck, wherein the wheel-side speed reducer comprises an axle housing, a wet brake and a wheel-side speed reducer; the axle housing and the main shaft of the wheel-side speed reducer are connected into a whole in a welding mode; the wheel edge speed reducer is isolated from the wet brake through bidirectional framework sealing; the framework seal is arranged in the seal seat cavity in a back-to-back mode, and the framework seal inner ring is matched with the support ring outer ring; the sun gear and the half shaft are assembled into a whole through a long bolt; the external spline of the sun gear and the external spline of the half shaft are respectively matched with the internal spline of the sliding sleeve; the limiting block and the sliding sleeve are used for limiting the axial position of the sun gear, so that proper axial movement is ensured; the gear ring and the gear ring bracket are connected in a spline fit manner and are limited axially through a pressing plate; the gear ring component is connected with the main shaft through a spline; the planetary assembly is embedded into the gear ring assembly, the outer part of the planetary assembly is meshed with the gear ring, and the inner part of the planetary assembly is meshed with the sun gear; the lock nut is used for adjusting the play of the cone bearing and locking the gear ring component; the limit screw is used for limiting the position of the lock nut and preventing loosening; the hub bolts are embedded into corresponding mounting holes of the hub in an interference mode; the planetary shaft is internally provided with an axial oil passage and a radial oil passage, so that lubrication of the outer ring needle roller bearing is ensured; the locating pins are used for limiting the axial and radial positions of the planet shafts; the planetary shafts are embedded into inner holes on the end surfaces of two sides of the planetary carrier in an interference mode; the adjusting pad is used for adjusting the gap between the planet wheel and the end face of the planet carrier, and the smooth rotation of the planet wheel is ensured.

The invention solves the problems of complex structure, low disassembly and assembly efficiency, poor maintenance, high manufacturing and using costs and the like of the traditional terminal driving device. The bidirectional framework sealing structure has relatively lower precision requirement on the sealing seat cavity, and can effectively reduce the processing and manufacturing cost. Meanwhile, due to the rectangular structural form of the framework seal, the framework is regular in shape and more convenient to install, the disassembly and assembly cost can be effectively reduced, the assembly failure rate is reduced, and the framework is more stable and reliable. And the sun gear and the half shaft are made of different materials according to the working condition requirements, so that the production cost is reduced. Meanwhile, the sun gear or the half shaft can be independently replaced according to actual abrasion conditions in the use process, so that the use cost is reduced, and the lean requirements of production efficiency and cost control are met.

In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.

Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features contained in other embodiments, but not others, combinations of features of different embodiments are equally meant to be within the scope of the invention and form different embodiments. For example, in the above embodiments, those skilled in the art can use the above embodiments in combination according to known technical solutions and technical problems to be solved by the present application.

The foregoing description is only illustrative of the preferred embodiment of the present invention, and is not to be construed as limiting the invention, but is to be construed as limiting the invention to any simple modification, equivalent variation and variation of the above embodiments according to the technical matter of the present invention without departing from the scope of the invention.

Claims (15)

1. A wheel-side speed reducer, comprising:

a spindle with a specific axial inner through hole;

the hub is sleeved on the outer peripheral surface of the main shaft, and a bearing and a sealing assembly are arranged between the opposite peripheral surfaces of the hub and the main shaft;

the gear ring assembly is sleeved on a main shaft positioned in the hub, and the gear ring assembly and the main shaft are connected through a spline;

the half shaft is inserted into the axial inner through hole of the main shaft;

the sun gear and the half shaft are of a detachable assembly structure, and external splines of the sun gear and the half shaft are matched with internal splines of the sliding sleeve respectively;

the planetary assembly is embedded in the gear ring assembly and connected with the hub, the outer part of the planetary assembly is meshed with the gear ring, and the inner part of the planetary assembly is meshed with the sun gear.

2. A hub reduction gear according to claim 1, wherein:

the main shaft is sleeved with a supporting ring, and the end face of the supporting ring is attached to the end face of the main shaft;

a sealing seat is arranged between the left inner hole of the hub and the opposite peripheral surface of the supporting ring, and sealing components are arranged on the outer peripheral surface of the sealing seat and in the inner hole of the sealing seat.

3. A hub reduction gear according to claim 2, wherein:

the sealing part positioned on the outer peripheral surface of the sealing seat is an O-shaped ring I, and is arranged in an annular groove on the outer peripheral surface of the sealing seat;

the sealing component positioned in the inner hole of the sealing seat is provided with two framework seals, the two framework seals are arranged in the inner hole of the sealing seat back to back, and the end face of the side of the framework seal is attached to the end face of the spigot of the sealing seat.

4. A hub reduction gear according to claim 2, wherein:

the inner hole on the right side of the hub is provided with a first conical bearing, the inner hole on the left side of the hub is provided with a second conical bearing, and the right end face of the sealing seat and the right end face of the supporting ring are attached to the left end face of the second conical bearing.

5. A hub reduction gear according to claim 1, wherein the ring gear assembly comprises:

a ring gear meshed with the planet gears in the planetary assembly;

the gear ring bracket is characterized in that an inner spline of a small end of the gear ring bracket is embedded and matched with an outer spline of the main shaft, and a cone bearing I is arranged between the small end and the opposite peripheral surface of the hub; the external spline of the big head end is embedded and matched with the internal spline of the gear ring and is tightly attached to the inner step surface of the gear ring;

and the pressing plates are uniformly and alternately arranged on the outer peripheral surface of the joint of the gear ring and the gear ring bracket, and are fixed on the gear ring by screw compression.

6. A hub reduction gear according to claim 1, wherein:

and a locking nut for adjusting the play of the bearing and locking the gear ring component is arranged on the external thread of the end part of the main shaft positioned in the hub.

7. The hub reduction gear according to claim 6, wherein:

a plurality of grooves are formed in the edge of the locking nut at intervals along the circumferential direction, and the limiting screw penetrates through the grooves and is screwed on the gear ring bracket of the gear ring assembly, so that the position of the locking nut is limited.

8. A hub reduction gear according to claim 1, wherein the planetary assembly comprises:

the inner holes of the planetary gears are provided with a plurality of needle bearings, and the planetary gears are separated in groups through a spacing ring;

the planet carrier is provided with a plurality of planet wheel mounting holes, and an adjusting washer is attached to the planet wheel mounting holes;

the planetary shaft, the planet wheel, the space ring and the needle roller bearing which are assembled in an integrated way move into the planet carrier from the side, the planetary shaft is embedded into inner holes of the planet carrier and the planet wheel, a radial hole at the left end part of the planetary shaft is aligned with a radial hole on the planet carrier, the positioning pin is used for limiting the planetary shaft, and the planet wheel is meshed with the gear ring and the sun wheel.

9. A hub reduction gear according to claim 8, wherein:

the limiting block is embedded into the unthreaded hole on the right side of the planet carrier, so that the clearance value between the sun gear and the limiting block is ensured to be 0.6-mm-0.8 mm.

10. A hub reduction gear according to claim 8, wherein:

the planet axle is internally provided with an axial oil passage and a radial oil passage for cooling the roller bearing.

11. A hub reduction gear according to claim 1, wherein:

a positioning ring used for limiting the axial displacement of the sun gear is embedded between the sliding sleeve and the inner hole on the right side of the main shaft.

12. A hub reduction gear according to claim 1, wherein:

the sun gear and the half shaft are assembled together through an axial long bolt.

13. A terminal driving device, characterized in that:

comprising an axle housing, a wet brake and a hub reduction gear according to any one of claims 1 to 12;

the end part of the main shaft is inserted into an inner hole of the axle housing, and is welded with the axle housing into a whole in a welding mode;

the wet brake is mounted on the hub.

14. The mining dump truck is characterized in that:

a hub reduction gear as claimed in any one of claims 1 to 12; alternatively, the terminal driving device according to claim 13 is mounted.

15. A method of assembling a terminal drive device, characterized by:

s1, connecting an axle housing and a main shaft of a terminal driving device into a whole in a welding mode;

s2, isolating the wet brake from the terminal driving device through bidirectional framework sealing;

s3, assembling a terminal driving device:

the gear ring and the gear ring bracket are connected through spline fit, and are limited axially through a pressing plate to form a gear ring assembly;

the assembled gear ring assembly is integrally embedded into the main shaft, the gear ring assembly is connected with the main shaft through a spline, and the locking nut is screwed in through external threads at the end part of the main shaft;

the sun gear is connected with the half shaft through a long bolt, and then the sliding sleeve slides in through the tail end of the half shaft, so that the internal spline of the sliding sleeve is meshed with the external spline of the half shaft and the external spline of the sun gear respectively;

the sun wheel, the long bolt, the half shaft and the sliding sleeve which are connected into a whole are inserted into an inner hole of the main shaft together;

the planetary assembly is embedded into the gear ring assembly, and the planetary assembly is mounted on the hub by using end cover screws, so that the planetary gear is meshed with the gear ring and the sun gear.