CN111810529A - High-speed motor spindle planetary gear supporting device and supporting method - Google Patents

Abstract

The invention discloses a high-speed motor spindle planet wheel supporting device and a supporting method thereof. The supporting method comprises the following steps: a. an axial thrust support is formed between the planetary roller and the rotating shaft; b. the outer diameter of the planet roller is designed to output the bearing rotating speed of the planet roller; c. the distribution of the planetary rollers acting on the rotating shaft is designed; d. the acting force applied by the planetary roller to the rotating shaft is designed; e. the planetary roller applies an urging force to the rotary shaft in a direction perpendicular to the axial center of the rotary shaft. The invention arranges at least three planetary rollers around the rotating shaft as the center at the position of the original bearing of the rotating shaft to replace the bearing to apply an acting force vertical to the axis direction of the rotating shaft to the rotating shaft, thereby providing stable radial support for the rotating shaft, playing the role of axial thrust and greatly improving the rotating speed and the bearing capacity of the rotating shaft.

Description

High-speed motor spindle planetary gear supporting device and supporting method

technical field

The invention belongs to the technical field of high-speed motor spindle support, and in particular relates to a high-speed motor spindle planetary wheel support device and a support method thereof.

Background technique

High-speed motors have the advantages of small size, small rotational inertia, compact structure, and high energy density, so they are widely used in industry, medical, automotive, aerospace and other fields. As shown in FIG. 1 , in the prior art, the bearing b is used to provide support for the high-speed rotor a. However, the bearing that supports the high-speed rotor in the motor has become the main obstacle to the development of the high-speed motor.

At present, the widely used bearings in high-speed motors include precision metal bearings, precision ceramic ball bearings, dynamic and static pressure air bearings, and magnetic suspension bearings. The first two are contact ball bearings with traditional mechanical structure, and the latter two are shaft suspension non-contact bearings. In order to pursue the limit speed, although the traditional ball bearing has made great progress in material and accuracy in recent years, due to the limitation of the structure principle, the application of ball bearing in the field of high-speed motor is affected by the processing and assembly accuracy, bearing limit speed, lubrication Constraints such as methods have become the biggest bottleneck for the motor to achieve ultra-high speed. Although the technologies such as dynamic and static pressure air suspension bearings and magnetic suspension bearings that have emerged in recent years are not limited by the rotational speed of traditional ball bearings, the support provided by such non-contact bearings is very limited, and the radial and axial directions of the main shaft cannot be supported. Larger loads cannot withstand the vibrations with large accelerations.

SUMMARY OF THE INVENTION

The purpose of the present invention is to solve the above-mentioned deficiencies in the prior art, and to provide a high-speed motor spindle planetary wheel supporting device and a supporting method thereof. At the original bearing position of the rotating shaft, at least three planetary rollers are arranged around the rotating shaft as the center. , instead of the bearing, it can exert a force perpendicular to the axis of the rotating shaft to provide a stable radial support for the rotating shaft, and at the same time, it can play an axial thrust function, which can greatly improve the rotation speed of the rotating shaft. Speed and carrying capacity; the use of planetary rollers to reduce the bearing speed of the planetary rollers greatly reduces the bearing speed load and processing difficulty of the planetary rollers, making it possible for ordinary-grade bearings to replace the original high-grade precision bearings; and has a simple structure , The characteristics of convenient manufacture and low cost.

In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions:

The high-speed motor spindle planetary wheel supporting device includes a casing and a rotating shaft, and the rotating shaft is installed in the casing; it is characterized in that: it also includes at least three planetary rollers installed on the casing, and the planetary rollers surround the rotating shaft as a central circumference layout. At the original bearing position of the rotating shaft, at least three planetary rollers are arranged around the rotating shaft to replace the bearing to exert a force perpendicular to the axial direction of the rotating shaft to the rotating shaft. Provides stable radial support, can greatly improve the rotational speed and bearing capacity of the rotating shaft, and has the characteristics of simple structure, convenient manufacture and low cost.

Further, the planetary rollers above the rotating shaft move on the casing, and the planetary rollers below the rotating shaft are fixed on the casing, so that the plurality of planetary rollers provide more stable radial support for the rotating shaft.

Further, the housing is provided with an installation hole perpendicular to the axis direction of the rotating shaft, and an elastic tensioner is movably connected in the installation hole, and the elastic tensioner exerts a pre-tightening force on the upper planetary roller, so that the upper planetary roller is pressed tightly. axis of rotation. The elastic tensioner of the present invention is generally divided into a connecting part and an elastic part, the elastic part is made of elastic material, and the method of applying a pre-tightening force to the upper planetary roller can be: (1) The installation hole is a hole with a smooth inner wall, and the installation hole is a hole with a smooth inner wall. The jacking structure exerts downward force on the elastic tensioner, and the elastic tensioner moves downward, so that the elastic part acts on the upper planetary roller and deforms, so that a pre-tightening force can be applied to the upper planetary roller to make The upper planetary roller is firmly pressed on the rotating shaft; (2) the mounting hole is designed as a threaded hole, the connecting part of the elastic tensioner is also threaded, and the connecting part is threaded in the mounting hole, through Twist the connecting part to make the elastic tensioner move downward, and the elastic part acts on the upper planetary roller and deforms, so that the upper planetary roller can be pre-tightened, so that the upper planetary roller can be firmly pressed on the axis of rotation. Through the above structure, the rotating shaft can be restricted to rotate in the middle of the included angle of the plurality of rollers, so that the plurality of planetary rollers can provide more stable radial support for the rotating shaft.

Further, since the planetary roller needs to be fixed in the housing, the present invention is provided with bearings at the front and rear ends of the planetary roller, and at the same time, bearing holes corresponding to the bearings are provided in the housing, and the bearing on the lower planetary roller and the lower The bearing holes are matched, that is, the outer surface of the bearing on the lower planetary roller fits on the inner side of the bearing hole. There is an active gap between the bearing on the upper planetary roller and the bearing hole above, and the elastic tensioner applies a pre-tightening force to the bearing on the upper planetary roller, so that the elastic tensioner exerts a pre-tightening force on the planetary roller. Node setting Inside the casing, it plays a protective role, so that the elastic tensioner exerts a reliable and safe pre-tightening force on the planetary roller. The width of the planetary roller of the present invention can be freely set according to the requirements of the working conditions.

Further, the outer diameter of the planetary roller (the outer diameter of the planetary roller is set as N) is larger than the outer diameter of the rotating shaft (the outer diameter of the rotating shaft is set as D), and the ratio between the outer diameter of the planetary roller N and the outer diameter of the rotating shaft D determines the rotation The ratio of the shaft speed to the planetary roller bearing speed, and the formula for calculating the reduction ratio is N/D=P. When the rotational speed of the rotating shaft is constant and the outer diameter of the rotating shaft is constant, the larger the P value, the lower the rotational speed of the planetary roller bearing. If the rotating shaft speed of the high-speed motor is designed to be 120,000 rpm, the outer diameter of the rotating shaft is 15 mm, and the outer diameter of the planetary roller is 75 mm, the P value is calculated to be 5, and the speed of the roller support bearing is only 24,000 rpm, which greatly reduces the roller support bearing. Speed load and processing difficulty make it possible for ordinary-grade bearings to replace original high-grade precision bearings.

Further, the planetary rollers are circumferentially distributed on the rotating shaft in the same plane, the number of planetary rollers below the rotating shaft is at least two, and the angle between the two planetary rollers below the rotating shaft is greater than 0 degrees and less than 180 degrees. , has the effect of simple structure and convenient manufacture.

Further, three planetary rollers are circumferentially distributed on the rotating shaft in the same plane, the dimensions of the three planetary rollers are the same, and the included angle between the two planetary rollers is 120 degrees. When the rotational speed of the rotating shaft is low, the limit rotational speed of the planetary roller bearing is high, and the P value is surplus, three planetary rollers on the same support surface are generally used as a group. In order to maximize the P value, the three rollers generally use the Evenly distributed to 120 degrees, the size of the three planetary rollers is the same, and the maximum P value of 6.45 can be obtained when the three planetary rollers of the same size are evenly distributed at 120 degrees on the same plane.

When the rotational speed of the rotating shaft is high, the limit speed of the planetary roller bearing is low, and the P value is not enough, different support surfaces can be selected, and the diameter of the planetary roller can be increased to increase the P value, that is, the planetary roller is not supported on one plane. On the axis of rotation, theoretically infinite P-values can be obtained.

Further, an axial thrust support is formed between the planetary roller and the rotating shaft to limit the axial movement of the rotating shaft.

Further, the axial thrust support methods are specifically divided into cylindrical planetary rollers, stepped planetary rollers, conical planetary rollers, wedge-shaped planetary rollers, and arc planetary rollers, specifically:

(1) Cylindrical planetary roller: The edge of the planetary roller is provided with a raised roller thrust surface, and the roller thrust surface can be provided with both sides or only one side. The edge of the rotating shaft is provided with a raised rotating shaft thrust surface, and the roller thrust surface is in contact with the rotating shaft thrust surface to provide one-way thrust to the rotating shaft.

(2) Step planetary roller: the edge of the planetary roller is provided with a stepped roller thrust surface, the edge of the rotating shaft is provided with a rotating shaft thrust surface that matches the stepped roller thrust surface, the roller thrust surface and the rotating shaft The thrust surfaces contact and provide a one-way thrust to the rotating shaft.

(3) Conical planetary roller: the shape of the planetary roller is designed as a conical shape, the outer surface of the planetary roller is used as the roller conical surface, the edge of the rotating shaft is provided with a first convex portion in a conical shape, and the outer surface of the first convex portion serves as a rotating surface. The conical surface of the shaft, the taper of the conical surface of the roller is opposite to that of the conical surface of the rotating shaft, the conical surface of the roller and the conical surface of the rotating shaft cooperate with each other, and there is no need for a special thrust surface between the planetary roller and the rotating shaft, providing a one-way stop for the rotating shaft. push action.

(4) Wedge-shaped planetary roller: Wedge-shaped limit connection between the planetary roller and the rotating shaft, wedge-shaped grooves can be set on the planetary roller, and protrusions are set on the rotating shaft to form a wedge shape, so that the protrusions on the rotating shaft and the planetary The grooves on the rollers match; or wedge-shaped grooves are arranged on the rotating shaft, and protrusions are arranged on the planetary rollers to form wedges, so that the protrusions on the planetary rollers match the grooves on the rotating shaft. There is no need for a special thrust surface between the planetary rollers and the rotating shaft to provide a two-way thrust function.

(5) Circular planetary roller: the planetary roller is provided with a first circular arc surface, the rotating shaft is provided with a second circular arc surface opposite to the first circular arc surface, and the second circular arc surface and the first circular arc surface cooperate with each other , There is no need for a special thrust surface between the planetary roller and the rotating shaft to provide a two-way thrust function for the rotating shaft.

The supporting method of the high-speed motor spindle planetary gear supporting device is characterized by comprising the following steps:

a. Design the shape of the planetary roller, and design the shape of the rotating shaft according to the shape of the planetary roller, so that an axial thrust support is formed between the planetary roller and the rotating shaft to limit the axial movement of the rotating shaft.

b. The design of the outer diameter of the planetary roller and the bearing speed of the output planetary roller: set the outer diameter of the planetary roller as N, the outer diameter of the rotating shaft as D, and the distance between the outer diameter of the planetary roller N and the outer diameter of the rotating shaft D The ratio determines the ratio of the rotational speed of the rotating shaft to the rotational speed of the bearing of the planetary roller. According to the reduction ratio calculation formula P=N/D, when the outer diameter D of the rotating shaft is constant, adjust the value of the outer diameter N of the planetary roller. The rotation speed of the rotating shaft is constant, and the bearing speed of the planetary roller is output.

c. Design the distribution of the planetary rollers acting on the rotating shaft: under the condition that the reduction ratio P value is guaranteed, three planetary rollers are designed to be in the same plane and circumferentially distributed on the rotating shaft, and the dimensions of the three planetary rollers are the same. , The three planetary rollers are arranged evenly in the circumferential direction of 120 degrees.

d. Design the force exerted by the planetary roller on the rotating shaft: a planetary roller above the rotating shaft is designed to be movable on the housing, and the bearing on the upper planetary roller is loaded into the upper bearing hole, and the other There is a movable gap between them, and the two planetary rollers below the rotating shaft are fixedly designed on the housing to limit the bearing on the lower planetary roller to the lower bearing hole.

e. The planetary roller exerts a force perpendicular to the axial direction of the rotating shaft: install an elastic tensioner in the installation hole of the casing perpendicular to the axial direction of the rotating shaft, and then place the elastic tensioner in the axial direction of the rotating shaft. A downward force is applied to the installation hole, and the elastic tensioner applies a pre-tightening force to the upper planetary roller, so that the upper planetary roller moves vertically downward, so that the three planetary rollers are pressed on the rotating shaft.

The present invention has the following beneficial effects due to the adoption of the above-mentioned technical solutions:

1. In the present invention, at the original bearing position of the rotating shaft, at least three planetary rollers are arranged around the rotating shaft to replace the bearing to exert a force perpendicular to the axial direction of the rotating shaft to the rotating shaft. In order to provide a stable radial support for the rotating shaft, the rotating speed and bearing capacity of the rotating shaft can be greatly improved, and the utility model has the characteristics of simple structure, convenient manufacture and low cost.

2. The present invention moves the planetary roller above the rotating shaft on the housing, and at the same time fixes the planetary roller below the rotating shaft on the housing, so that multiple planetary rollers provide more stable radial support for the rotating shaft.

3. The outer diameter of the planetary roller (the outer diameter of the planetary roller is set as N) is larger than the outer diameter of the rotating shaft (the outer diameter of the rotating shaft is set as D). The ratio between the outer diameter of the planetary roller N and the outer diameter of the rotating shaft D determines the rotation The ratio of the shaft speed to the planetary roller bearing speed, and the formula for calculating the reduction ratio is N/D=P. When the rotational speed of the rotating shaft is constant and the outer diameter of the rotating shaft is constant, the larger the P value, the lower the rotational speed of the planetary roller bearing. If the rotating shaft speed of the high-speed motor is designed to be 120,000 rpm, the outer diameter of the rotating shaft is 15 mm, and the outer diameter of the planetary roller is 75 mm, the P value is calculated to be 5, and the speed of the roller support bearing is only 24,000 rpm, which greatly reduces the roller support bearing. Speed load and processing difficulty make it possible for ordinary-grade bearings to replace original high-grade precision bearings.

4. The present invention forms an axial thrust support between the planetary roller and the rotating shaft to limit the axial movement of the rotating shaft.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings:

Fig. 1 is the structural representation of the prior art;

2 is a schematic structural diagram of a high-speed motor spindle planetary gear support device in the present invention;

3 is a schematic structural diagram of the elastic tensioner in the present invention applying a pre-tightening force to the bearing on the planetary roller;

4 is a schematic structural diagram of the planetary rollers in the same plane circumferentially distributed on the rotating shaft in the present invention;

5 is a schematic structural diagram of the planetary rollers in different planes distributed on the rotating shaft in the present invention;

6 is a schematic diagram of the partial structure of the planetary rollers in different planes distributed on the rotating shaft in the present invention;

Fig. 7 is the structural representation of the planetary roller in the present invention;

Fig. 8 is the left side view of Fig. 7;

Fig. 9 is the structural representation of the rotating shaft in the present invention;

10 is a schematic structural diagram of three planetary rollers of the same size in the same plane circumferentially distributed on the rotating shaft in the present invention;

11 is a schematic structural diagram of three planetary rollers of different sizes in the same plane circumferentially distributed on the rotating shaft in the present invention;

12 is a schematic structural diagram of the elastic tensioner applying a pre-tightening force to an upper planetary roller in the present invention;

13 is a schematic structural diagram of the elastic tensioner applying pre-tightening force to the upper two planetary rollers in the present invention;

14 is a schematic structural diagram of an axial thrust support method using cylindrical planetary rollers in the present invention;

15 is a schematic structural diagram of an axial thrust support method using stepped planetary rollers in the present invention;

16 is a schematic structural diagram of an axial thrust support method using a conical planetary roller in the present invention;

17 is a schematic structural diagram of an axial thrust support method using a wedge-shaped planetary roller in the present invention;

FIG. 18 is a schematic structural diagram of an axial thrust support method using a circular arc planetary roller in the present invention.

In the figure, 1-rotating shaft; 2-housing; 3-elastic tensioner; 4-installation hole; 5-planet roller; 6-bearing; 7-roller thrust surface; 8-rotating shaft thrust surface.

Detailed ways

As shown in FIG. 2 to FIG. 18 , it is a high-speed motor spindle planetary gear support device of the present invention, including a casing 2 and a rotating shaft 1 , and the rotating shaft 1 is installed in the casing 2 .

The present invention also includes at least three planetary rollers 5 mounted on the housing 2 , and the planetary rollers 5 are arranged around the rotating shaft 1 as a central circumference. At the original bearing position of the rotating shaft 1, at least three planetary rollers 5 are arranged around the rotating shaft 1 to replace the bearings, so as to exert a force perpendicular to the axial direction of the rotating shaft 1 to the rotating shaft 1, It can provide stable radial support for the rotating shaft 1, can greatly improve the rotational speed and bearing capacity of the rotating shaft 1, and has the characteristics of simple structure, convenient manufacture and low cost.

The planetary rollers 5 above the rotating shaft 1 move on the casing 2 , and the planetary rollers 5 below the rotating shaft 1 are fixed on the casing 2 , so that the plurality of planetary rollers 5 provide more stable radial support for the rotating shaft 1 . The planetary roller 5 is specifically configured as follows: the housing 2 is provided with a mounting hole 4 perpendicular to the axial direction of the rotating shaft 1, and an elastic tensioner 3 is movably connected in the mounting hole 4, and the elastic tensioner 3 is opposite to the upper planetary roller 5. Apply pre-tightening force so that the upper planetary roller 5 presses the rotating shaft 1. The elastic tensioner 3 of the present invention is generally divided into a connecting part and an elastic part, the elastic part is made of elastic material, and the method of applying a pre-tightening force to the upper planetary roller 5 can be: (1) The mounting hole 4 has a smooth inner wall A downward force is applied to the elastic tensioner 3 through the pushing structure, and the elastic tensioner 3 moves downward, so that the elastic part acts on the upper planetary roller 5 and deforms, so that the upper planetary roller can be adjusted. 5. Apply a pre-tightening force to make the upper planetary roller 5 firmly press on the rotating shaft 1; (2) Design the mounting hole 4 as a threaded hole, and set the connecting part of the elastic tensioner 3 with threads. The connecting part is screwed into the mounting hole 4, and the elastic tensioner 3 is moved downward by screwing the connecting part, and the elastic part acts on the upper planetary roller 5 and deforms, so that the upper planetary roller can be adjusted to the upper planetary roller. 5. Apply pre-tightening force so that the upper planetary roller 5 is firmly pressed on the rotating shaft 1. Through the above structure, the rotating shaft 1 can be restricted to rotate in the middle of the included angle of the plurality of rollers, so that the plurality of planetary rollers 5 can provide more stable radial support for the rotating shaft 1 . Since the planetary roller 5 needs to be fixed in the housing 2, the present invention is provided with bearings 6 at the front and rear ends of the planetary roller 5, and at the same time, bearing holes corresponding to the bearing 6 are arranged in the housing 2, and the lower planetary roller 5 The upper bearing 6 matches the lower bearing hole, that is, the outer surface of the bearing 6 on the lower planetary roller 5 is fitted on the inner side of the bearing hole. There is an active gap between the bearing 6 on the upper planetary roller 5 and the bearing hole above, and the elastic tensioner 3 applies a pre-tightening force to the bearing 6 on the upper planetary roller 5, so that the elastic tensioner 3 is on the planetary roller 5. The nodes applying the preloading force are arranged inside the housing 2 and play a protective role, so that the elastic tensioner 3 exerts the preloading force on the planetary roller 5 reliably and safely. The width of the planetary roller 5 of the present invention can be freely set according to the requirements of the working conditions.

The outer diameter of the planetary roller 5 (the outer diameter of the planetary roller 5 is set as N) is generally larger than the outer diameter of the rotating shaft 1 (the outer diameter of the rotating shaft 1 is set as D), between the outer diameter N of the planetary roller 5 and the outer diameter D of the rotating shaft 1 Determines the ratio of the rotational speed of the rotating shaft 1 to the rotational speed of the planetary roller 5 bearing 6, and the calculation formula of the reduction ratio is N/D=P. When the rotational speed of the rotating shaft 1 is constant and the outer diameter of the rotating shaft 1 is constant, the larger the P value, the lower the rotational speed of the bearing 6 of the planetary roller 5 . For example, the rotating speed of the rotating shaft 1 of the high-speed motor is designed to be 120,000 rpm, the outer diameter of the rotating shaft 1 is 15 mm, and the outer diameter of the planetary roller 5 is 75 mm, then the P value is calculated to be 5, and the rotating speed of the roller support bearing 6 is only 24,000 rpm, which greatly reduces the The rotational speed load and processing difficulty of the roller support bearing 6 make it possible for ordinary-grade bearings to replace the original high-grade precision bearings.

The planetary rollers 5 are circumferentially distributed on the rotating shaft 1 in the same plane. The number of the planetary rollers 5 below the rotating shaft 1 is at least two, and the angle between the two planetary rollers 5 below the rotating shaft 1 is greater than 0 The degree is less than 180 degrees, which has the effect of simple structure and convenient manufacture. The specific design of the number and distribution of the planetary rollers 5: Three planetary rollers 5 are circumferentially distributed on the rotating shaft 1 in the same plane, the dimensions of the three planetary rollers 5 are the same, and the angle between the two planetary rollers 5 is 120 Spend. When the rotational speed of the rotating shaft 1 is low and the limit rotational speed of the bearing 6 of the planetary roller 5 is high, and the P value has a margin, generally three planetary rollers 5 on the same support surface are used as a group. In order to maximize the P value, three The planetary rollers 5 are generally arranged in a circumferential direction of 120 degrees, and the three planetary rollers 5 are of the same size. When three planetary rollers 5 of the same size are evenly distributed at 120 degrees on the same plane, the maximum P value of 6.45 can be obtained, such as As shown in FIG. 10, T1=T2=120 degrees. Different sizes can also be set for each planetary roller 5 as required, and the circumferential angle can be set to be non-uniformly arranged at 120 degrees, as shown in FIG. 11 , T4>T3. When the rotational speed of the rotating shaft 1 is high, but the limit rotational speed of the bearing 6 of the planetary roller 5 is low, and the P value is not enough, different supporting surfaces can be selected, and the diameter of the planetary roller 5 can be increased to increase the P value, that is, the planetary roller The roller 5 is not supported on the rotating shaft 1 in a plane, and an infinite P value can theoretically be obtained, as shown in FIG. 5 and FIG. 6 . According to the size of the planetary rollers 5 , four planetary rollers 5 can be arranged to radially support the rotating shaft 1 , as shown in FIG. 13 .

An axial thrust support is formed between the planetary roller 5 and the rotating shaft 1 to limit the axial movement of the rotating shaft 1 . The axial thrust support methods are specifically divided into cylindrical planetary rollers (as shown in Fig. 14), stepped planetary rollers (as shown in Fig. 15), conical planetary rollers (as shown in Fig. 16), wedge-shaped planetary rollers 5 (as shown in Fig. 17), and arc planetary rollers (Figure 18), specifically:

(1) Cylindrical planetary roller 5: The edge of the planetary roller 5 is provided with a raised roller thrust surface 7, and the roller thrust surface 7 can be provided with both sides or only one side. The edge of the rotating shaft 1 is provided with a raised rotating shaft thrust surface 8 , and the roller thrust surface 7 is in contact with the rotating shaft thrust surface 8 to provide a one-way thrust to the rotating shaft 1 .

(2) stepped planetary roller 5: the edge of the planetary roller 5 is provided with a stepped roller thrust surface 7, and the edge of the rotating shaft 1 is provided with a rotating shaft thrust surface 8 that matches the stepped roller thrust surface 7, The roller thrust surface 7 is in contact with the rotating shaft thrust surface 8 to provide a one-way thrust to the rotating shaft 1 .

(3) Conical planetary roller 5: The shape of the planetary roller 5 is designed as a conical shape, the outer surface of the planetary roller 5 is used as a roller conical surface, and the edge of the rotating shaft 1 is provided with a conical first convex portion, the first convex portion The outer surface is the conical surface of the rotating shaft 1. The taper of the conical surface of the roller is opposite to that of the conical surface of the rotating shaft 1. The conical surface of the roller and the conical surface of the rotating shaft 1 cooperate with each other, and there is no need for a special thrust surface between the planetary rollers 5 and 1. , to provide a one-way thrust to the rotating shaft 1.

(4) Wedge-shaped planetary roller 5: a wedge-shaped limit connection between the planetary roller 5 and the rotating shaft 1, a wedge-shaped groove can be set on the planetary roller 5, and a wedge-shaped protrusion can be set on the rotating shaft 1, so that the rotating shaft 1 The protrusion on the planetary roller 5 matches the groove on the planetary roller 5; or a wedge-shaped groove is set on the rotating shaft 1, and a protrusion is set on the planetary roller 5 to form a wedge shape, so that the protrusion on the planetary roller 5 and the rotating shaft are 1 on the groove to match. There is no need for a special thrust surface between the planetary roller 5 and the rotating shaft 1 to provide a two-way thrust function.

(5) Circular planetary roller 5: the planetary roller 5 is provided with a first circular arc surface, the rotating shaft 1 is provided with a second circular arc surface opposite to the first circular arc surface, the second circular arc surface and the first circular arc The surfaces cooperate with each other, and there is no need for a special thrust surface between the planetary rollers 5 and the rotating shaft 1 to provide a two-way thrust function.

The supporting method of the high-speed motor spindle planetary gear supporting device includes the following steps:

a. Design the shape of the planetary roller 5, and design the shape of the rotating shaft 1 according to the shape of the planetary roller 5, so that an axial thrust support is formed between the planetary roller 5 and the rotating shaft 1 to limit the axial direction of the rotating shaft 1 move.

The present invention provides radial support to the rotating shaft 1 through a plurality of planetary rollers 5 ; meanwhile, axial thrust support is formed between the planetary rollers 5 and the rotating shaft 1 to limit the axial movement of the rotating shaft 1 .

b. Design of the outer diameter of the planetary roller 5, outputting the rotational speed of the bearing 6 of the planetary roller 5: the outer diameter of the planetary roller 5 is set as N, the outer diameter of the rotating shaft 1 is set as D, the outer diameter of the planetary roller 5 is N and the rotating shaft The ratio between the outer diameter D of 1 determines the ratio of the rotational speed of the rotating shaft 1 to the rotational speed of the bearing 6 of the planetary roller 5. According to the reduction ratio calculation formula P=N/D, according to the case where the outer diameter D of the rotating shaft 1 is constant, By adjusting the value of the outer diameter N of the planetary roller 5 , the rotational speed of the bearing 6 of the planetary roller 5 is output by the constant rotational speed of the rotating shaft 1 .

When the rotational speed of the rotating shaft 1 is constant and the outer diameter of the rotating shaft 1 is constant, the larger the P value, the lower the rotational speed of the planetary roller 5 bearing 6 . For example, the rotating speed of the rotating shaft 1 of the high-speed motor is designed to be 120,000 rpm, the outer diameter of the rotating shaft 1 is 15 mm, and the outer diameter of the planetary roller 5 is 75 mm, then the P value is calculated to be 5, and the rotating speed of the roller support bearing 6 is only 24,000 rpm, which greatly reduces the The rotational speed load and processing difficulty of the roller support bearing 6 make it possible for ordinary-grade bearings to replace the original high-grade precision bearings.

c. Design the distribution of the planetary rollers 5 acting on the rotating shaft 1: under the condition that the reduction ratio P value is guaranteed, three planetary rollers 5 are designed to be circumferentially distributed on the rotating shaft 1 in the same plane, and the three planetary rollers are designed. The dimensions of the 5 are the same, and the three planetary rollers 5 are uniformly arranged in a circumferential direction of 120 degrees.

The maximum P value of 6.45 can be obtained when three rollers of the same size are distributed evenly at 120 degrees on the same plane.

d. Design the force exerted by the planetary roller 5 on the rotating shaft 1: a planetary roller 5 above the rotating shaft 1 is movably designed on the housing 2, and the bearing 6 on the upper planetary roller 5 is loaded into the upper one. In the bearing hole, there is a movable gap between the two, and the two planetary rollers 5 below the rotating shaft 1 are fixedly designed on the housing 2, and the bearing 6 on the lower planetary roller 5 is limited to the lower bearing hole. middle.

e. The planetary roller 5 exerts a force perpendicular to the axial direction of the rotating shaft 1 on the rotating shaft 1: the elastic tensioner 3 is installed in the mounting hole 4 of the casing 2 perpendicular to the axial direction of the rotating shaft 1, Then apply downward force to the elastic tensioner 3 in the installation hole 4, and the elastic tensioner 3 applies a pre-tightening force to the upper planetary roller 5, so that the upper planetary roller 5 moves vertically downward, so that the three planets The roller 5 is pressed on the rotating shaft 1 .

The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent replacements or modifications made based on the present invention in order to solve basically the same technical problems and achieve basically the same technical effects are all included in the protection scope of the present invention.

Claims (10)

1. High-speed motor spindle planetary gear support device, including: case; a rotating shaft, the rotating shaft is installed in the housing; It is characterized by: It also includes at least three planetary rollers mounted on the housing, the planetary rollers are arranged around the rotation axis as a central circumference, and the planetary rollers all apply an axis perpendicular to the rotation axis to the rotation axis force in the direction of the heart. 2 . The high-speed motor spindle planetary wheel supporting device according to claim 1 , wherein the planetary roller above the rotating shaft moves on the casing, and the planetary wheel below the rotating shaft moves on the casing. 3 . The roller is fixed on the housing. 3 . The high-speed motor spindle planetary gear support device according to claim 2 , wherein the housing is provided with a mounting hole perpendicular to the axial direction of the rotating shaft, and the mounting hole is movably connected with elasticity. 4 . A tensioner, the elastic tensioner applies a pre-tightening force to the upper planetary roller, so that the upper planetary roller is pressed on the rotating shaft. 4. The high-speed motor spindle planetary wheel supporting device according to claim 3, wherein the front and rear ends of the planetary roller are provided with bearings, and the housing is provided with bearing holes corresponding to the bearings, The bearing on the lower planetary roller matches the bearing hole below, there is a movable gap between the bearing on the upper planetary roller and the bearing hole above, and the elastic tension The device applies a preload force to the bearing on the upper planetary roller. 5. The high-speed motor spindle planetary wheel supporting device according to claim 1, wherein the outer diameter of the planetary roller is larger than the outer diameter of the rotating shaft. 6. The high-speed motor spindle planetary wheel support device according to any one of claims 1 to 5, wherein the planetary rollers are circumferentially distributed on the rotating shaft in the same plane, and the planetary rollers are located below the rotating shaft. The number of the planetary rollers is at least two, and the included angle between the two planetary rollers below the rotating shaft is greater than 0 degrees and less than 180 degrees. 7 . The high-speed motor spindle planetary wheel supporting device according to claim 6 , wherein the three planetary rollers are circumferentially distributed on the rotating shaft in the same plane, and the sizes of the three planetary rollers are the same. 8 . Likewise, the included angle between the two planetary rollers is 120 degrees. 8 . The high-speed motor spindle planetary gear support device according to claim 1 , wherein an axial thrust support is formed between the planetary roller and the rotating shaft to limit the axial movement of the rotating shaft. 9 . . 9. The high-speed motor spindle planetary gear support device according to claim 8, wherein the axial thrust support mode is specifically divided into: (1) The edge of the planetary roller is provided with a raised roller thrust surface, the edge of the rotating shaft is provided with a raised rotating shaft thrust surface, and the roller thrust surface is in contact with the rotating shaft thrust surface, providing a one-way thrust to the rotating shaft; (2) The edge of the planetary roller is provided with a stepped roller thrust surface, and the edge of the rotating shaft is provided with a rotating shaft thrust surface matched with the stepped roller thrust surface. The roller thrust surface and The thrust surface of the rotating shaft is in contact to provide a one-way thrust function for the rotating shaft; (3) The shape of the planetary roller is designed to be a conical shape, the outer surface of the planetary roller is used as a roller conical surface, the edge of the rotating shaft is provided with a first convex portion in a conical shape, and the first convex portion is The outer surface is the conical surface of the rotating shaft. The taper of the conical surface of the roller is opposite to that of the conical surface of the rotating shaft. The conical surface of the roller and the conical surface of the rotating shaft cooperate with each other to provide a one-way stop for the rotating shaft. push; (4) The wedge-shaped limit connection between the planetary roller and the rotating shaft provides bidirectional thrust to the rotating shaft; (5) The planetary roller is provided with a first circular arc surface, the rotating shaft is provided with a second circular arc surface opposite to the first circular arc surface, and the second circular arc surface is opposite to the first circular arc surface. The arc surfaces cooperate with each other to provide a two-way thrust function for the rotating shaft. 10. The support method of the high-speed motor spindle planetary gear support device according to claim 1, characterized in that it comprises the following steps: a. Design the shape of the planetary roller, and design the shape of the rotating shaft according to the shape of the planetary roller, so that an axial thrust support is formed between the planetary roller and the rotating shaft to limit the axial movement of the rotating shaft; b. The design of the outer diameter of the planetary roller and the bearing speed of the output planetary roller: set the outer diameter of the planetary roller as N, the outer diameter of the rotating shaft as D, and the distance between the outer diameter of the planetary roller N and the outer diameter of the rotating shaft D The ratio determines the ratio of the rotational speed of the rotating shaft to the rotational speed of the bearing of the planetary roller. According to the reduction ratio calculation formula P=N/D, when the outer diameter D of the rotating shaft is constant, adjust the value of the outer diameter N of the planetary roller. The rotation speed of the rotating shaft is constant, and the bearing speed of the output planetary roller; c. Design the distribution of the planetary rollers acting on the rotating shaft: under the condition that the reduction ratio P value is guaranteed, three planetary rollers are designed to be in the same plane and circumferentially distributed on the rotating shaft, and the dimensions of the three planetary rollers are the same. , the three planetary rollers are arranged evenly in the circumferential direction of 120 degrees; d. Design the force exerted by the planetary roller on the rotating shaft: a planetary roller above the rotating shaft is designed to be movable on the housing, and the bearing on the upper planetary roller is loaded into the upper bearing hole, and the other There is a movable gap between the two planetary rollers, and the two planetary rollers below the rotating shaft are fixedly designed on the housing to limit the bearing on the lower planetary roller to the lower bearing hole; e. The planetary roller exerts a force perpendicular to the axial direction of the rotating shaft: install an elastic tensioner in the installation hole of the casing perpendicular to the axial direction of the rotating shaft, and then place the elastic tensioner in the axial direction of the rotating shaft. A downward force is applied to the installation hole, and the elastic tensioner applies a pre-tightening force to the upper planetary roller, so that the upper planetary roller moves vertically downward, so that the three planetary rollers are pressed on the rotating shaft.

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