CN111810529B

CN111810529B - High-speed motor main shaft planetary gear supporting device and supporting method thereof

Info

Publication number: CN111810529B
Application number: CN202010805731.9A
Authority: CN
Inventors: 唐正宽; 唐坚梁
Original assignee: Xinchang Jinduoduo Intelligent Equipment Co ltd
Current assignee: Xinchang Jinduoduo Intelligent Equipment Co ltd
Priority date: 2020-08-12
Filing date: 2020-08-12
Publication date: 2025-06-13
Anticipated expiration: 2040-08-12
Also published as: CN111810529A

Abstract

The invention discloses a high-speed motor main shaft planet wheel supporting device and a supporting method thereof. The supporting method comprises the steps of forming an axial thrust support between a planetary roller and a rotating shaft, designing the outer diameter of the planetary roller, outputting the bearing rotating speed of the planetary roller, designing the distribution condition of the planetary roller acting on the rotating shaft, designing the acting force applied by the planetary roller to the rotating shaft, and applying the acting force perpendicular to the axis direction of the rotating shaft by the planetary roller. The invention sets at least three planetary rollers around the rotation shaft as center at the original position of the rotation shaft, which replaces the bearing to apply the acting force perpendicular to the axis direction of the rotation shaft, thus providing stable radial support for the rotation shaft, and simultaneously playing the role of axial thrust and greatly improving the rotation speed and bearing capacity of the rotation shaft.

Description

High-speed motor spindle planet wheel supporting device and supporting method thereof

Technical Field

The invention belongs to the technical field of high-speed motor spindle support, and particularly relates to a high-speed motor spindle planet wheel support device and a high-speed motor spindle planet wheel support method.

Background

The high-speed motor has the advantages of small volume, small rotational inertia, compact structure, high energy density and the like, and is widely used in the fields of industry, medical treatment, automobiles, aerospace and the like. As shown in fig. 1, the prior art uses bearings b to provide support for the high speed rotor a. Bearings in electrical machines that provide support for the high speed rotor have, however, become a major obstacle affecting the development of high speed electrical machines.

At present, the bearings which are widely applied in the high-speed motor are four types of precise metal bearings, precise ceramic ball bearings, dynamic and static air bearings and magnetic suspension bearings. The first two are contact ball bearings of traditional mechanical structure, and the second two are shaft suspension non-contact bearings. In order to pursue the limit rotation speed, although the traditional ball bearing has great progress in material and precision in the years, the ball bearing is limited by the structural principle, and is limited by the machining assembly precision, the bearing limit rotation speed, the lubrication mode and the like in the application of the high-speed motor field, so that the ball bearing has become the biggest bottleneck for realizing the ultrahigh rotation speed of the motor. In recent years, technologies such as dynamic and static pressure air suspension bearings, magnetic suspension bearings and the like are not limited by the rotating speed of the traditional ball bearings, but the non-contact bearings can provide very limited supporting force, and the radial direction and the axial direction of a main shaft cannot bear larger load and cannot bear vibration with larger acceleration.

Disclosure of Invention

The invention aims to solve the defects in the prior art, provides a high-speed motor spindle planet wheel supporting device and a supporting method thereof, wherein at least three planet wheels are arranged around a rotating shaft which is used as a center at the original position of the rotating shaft and used for replacing the bearing, so that acting force perpendicular to the axis direction of the rotating shaft is applied to the rotating shaft, stable radial support is provided for the rotating shaft, an axial thrust function is realized, the rotating speed and the bearing capacity of the rotating shaft can be greatly improved, the bearing rotating speed of the planet wheels is reduced by utilizing the planet wheels, the bearing rotating speed load and the processing difficulty of the planet wheels are greatly reduced, and the common-level bearing can replace the original high-level precision bearing.

In order to solve the technical problems, the invention adopts the following technical scheme:

The planetary wheel supporting device for the high-speed motor spindle comprises a shell, a rotating shaft and at least three planetary wheels, wherein the rotating shaft is arranged in the shell, and the planetary wheels are arranged on the shell and are circumferentially arranged around the rotating shaft as a center. At the original bearing position department that sets up of rotation axis, around taking the rotation axis as the center, set up at least three planetary roller to replace the bearing, exert the effort of perpendicular to the axle center direction of rotation axis to the rotation axis, play and provide firm radial support to the rotation axis, can improve rotation speed and bearing capacity of rotation axis by a wide margin, have simple structure, make convenient, low cost's characteristics moreover.

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

Further, the casing is provided with a mounting hole perpendicular to the axis direction of the rotating shaft, an elastic tensioner is movably connected in the mounting hole, and the elastic tensioner applies a pretightening force to the planetary rollers above, so that the planetary rollers above press the rotating shaft. The elastic tensioner is generally divided into a connecting part and an elastic part, wherein the elastic part is made of elastic materials, the mode of applying pretightening force to the upper planetary roller is that (1) the mounting hole is a hole with a smooth inner wall, downward acting force is applied to the elastic tensioner through a pushing structure, the elastic tensioner moves downwards, the elastic part acts on the upper planetary roller and deforms, pretightening force can be applied to the upper planetary roller, the upper planetary roller is firmly pressed on a rotating shaft, and (2) the mounting hole is designed into a hole with threads, the connecting part of the elastic tensioner is also provided with threads, the connecting part is connected in the mounting hole in a threaded manner, and the elastic tensioner moves downwards, the elastic part acts on the upper planetary roller and deforms, so that pretightening force can be applied to the upper planetary roller, and the upper planetary roller is firmly pressed on the rotating shaft. Through the structure, the rotating shaft can be limited to rotate in the middle of the included angles of the plurality of rollers, so that the plurality of planetary rollers provide more stable radial support for the rotating shaft.

Furthermore, because the planetary roller is required to be fixed in the shell, the bearings are arranged at the front end and the rear end of the planetary roller, meanwhile, bearing holes corresponding to the bearings are arranged in the shell, the bearings on the lower planetary roller are matched with the bearing holes on the lower planetary roller, namely, the outer surfaces of the bearings on the lower planetary roller are attached to the inner sides of the bearing holes. There is the clearance that moves between the bearing on the planetary roller of top and the bearing hole of top, and the pretension is applyed to the bearing on the planetary roller of top to the elasticity tensioning ware for the elasticity tensioning ware is applyed the node setting of pretension in the inside of casing to the planetary roller, plays the guard action, makes elasticity tensioning ware apply the pretension reliably, safety to the planetary roller. The width of the planetary roller can be freely set according to working condition requirements.

Further, the outer diameter of the planetary roller (the outer diameter of the planetary roller is defined as N) is larger than the outer diameter of the rotary shaft (the outer diameter of the rotary shaft is defined as D), the ratio between the outer diameter of the planetary roller N and the outer diameter of the rotary shaft D is determined, and the ratio of the rotary shaft rotational speed to the planetary roller bearing rotational speed is calculated by the reduction ratio calculation formula of N/d=p. When the rotation speed of the rotation shaft is constant and the outer diameter of the rotation shaft is constant, the larger the P value is, the lower the rotation speed of the planetary roller bearing is. If the rotating speed of the rotating shaft of the high-speed motor is designed to be 120000rpm, the outer diameter of the rotating shaft is 15mm, and the outer diameter of the planetary roller is 75 mm, the P value is calculated to be 5, and the rotating speed of the roller support bearing is only 24000rpm, so that the rotating speed load and the processing difficulty of the roller support bearing are greatly reduced, and the possibility of replacing the original high-grade precision bearing by the bearing of the common grade is realized.

Further, the planetary rollers are circumferentially distributed on the rotating shaft in the same plane, the number of the planetary rollers below the rotating shaft is at least two, and the included angle between the two planetary rollers below the rotating shaft is larger than 0 degree and smaller than 180 degrees, so that the effects of simple structure and convenience in manufacturing are achieved.

Further, three planetary rollers are circumferentially distributed on the rotating shaft in the same plane, the three planetary rollers are the same in size, and an included angle between the two planetary rollers is 120 degrees. When the rotating speed of the rotating shaft is lower and the limit rotating speed of the planetary roller bearing is higher, and the P value is rich, three planetary rollers on the same supporting surface are generally taken as a group, in order to pursue the maximization of the P value, the three planetary rollers are generally uniformly distributed and arrayed at 120 degrees in the circumferential direction, the sizes of the three planetary rollers are the same, and the maximum P value of 6.45 can be obtained when the three planetary rollers with the same size are uniformly distributed at 120 degrees on the same plane.

When the rotation speed of the rotation shaft is higher and the limit rotation speed of the planetary roller bearing is lower, different supporting surfaces can be selected and the diameter of the planetary roller is increased to increase the P value under the condition that the P value is insufficient, namely the planetary roller is not supported on the rotation shaft on a plane, and the infinite P value can be obtained theoretically.

Further, an axial thrust support is formed between the planetary rollers and the rotating shaft for restricting axial movement of the rotating shaft.

Further, the axial thrust supporting mode is specifically divided into a cylindrical planetary roller, a stepped planetary roller, a conical planetary roller, a wedge-shaped planetary roller and an arc planetary roller, and specifically comprises the following steps:

(1) The cylindrical planetary roller has raised roller thrust surface in the edge, and the roller thrust surface may have double sides or single side. The edge of the rotating shaft is provided with a convex rotating shaft thrust surface, and the roller thrust surface is contacted with the rotating shaft thrust surface to provide a unidirectional thrust effect for the rotating shaft.

(2) The stepped planetary roller has stepped roller thrust surface on the edge and rotating shaft thrust surface on the edge, and the roller thrust surface contacts with the rotating shaft thrust surface to provide one-way thrust to the rotating shaft.

(3) The shape of the planetary roller is designed into a conical shape, the outer surface of the planetary roller is used as a roller conical surface, a first bulge part in a conical shape is arranged at the edge of the rotating shaft, the outer surface of the first bulge part is used as a rotating shaft conical surface, the conicity of the roller conical surface is opposite to that of the rotating shaft conical surface, the roller conical surface is matched with the rotating shaft conical surface, and a special thrust surface is not needed between the planetary roller and the rotating shaft, so that a unidirectional thrust effect is provided for the rotating shaft.

(4) The wedge-shaped planetary roller is characterized in that the planetary roller is in wedge-shaped limiting connection with the rotating shaft, wedge-shaped grooves are formed in the planetary roller, protrusions are arranged on the rotating shaft to form wedges, so that the protrusions on the rotating shaft are matched with the grooves on the planetary roller, or wedge-shaped grooves are formed in the rotating shaft, protrusions are arranged on the planetary roller to form wedges, so that the protrusions on the planetary roller are matched with the grooves on the rotating shaft. The planetary rollers do not need special thrust surfaces between the planetary rollers and the planetary rollers, and a bidirectional thrust effect is provided for the rotating shaft.

(5) The arc planetary roller is provided with a first arc surface, the rotating shaft is provided with a second arc surface opposite to the first arc surface, the second arc surface is matched with the first arc surface, no special thrust surface is needed between the planetary roller and the first arc surface, and a bidirectional thrust effect is provided for the rotating shaft.

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

a. the shape of the planetary roller is designed, and the shape of the rotating shaft is designed according to the shape of the planetary roller, so that an axial thrust support is formed between the planetary roller and the rotating shaft and used for limiting the axial movement of the rotating shaft.

B. The outer diameter design of the planetary roller is used for outputting the bearing rotating speed of the planetary roller, wherein the outer diameter of the planetary roller is defined as N, the outer diameter of the rotating shaft is defined as D, the ratio between the outer diameter N of the planetary roller and the outer diameter D of the rotating shaft is determined, the ratio of the rotating shaft rotating speed to the bearing rotating speed of the planetary roller is determined, the numerical value of the outer diameter N of the planetary roller is regulated according to a reduction ratio calculation formula P=N/D under the condition that the outer diameter D of the rotating shaft is constant, and the bearing rotating speed of the planetary roller is output through the constant rotating speed of the rotating shaft.

C. The distribution condition of the planetary rollers acting on the rotating shaft is designed, namely, under the condition that the surplus of the reduction ratio P value is ensured, three planetary rollers are designed to be circumferentially distributed on the rotating shaft on the same plane, the sizes of the three planetary rollers are the same, and the three planetary rollers are uniformly distributed and arrayed in the circumferential direction by 120 degrees.

D. The planetary rollers apply force to the rotating shaft, and the planetary rollers above the rotating shaft are designed movably on the shell, the bearings on the upper planetary rollers are installed in the bearing holes above, a movable gap exists between the two planetary rollers, and meanwhile, the two planetary rollers below the rotating shaft are designed fixedly on the shell, and the bearings on the lower planetary rollers are limited in the bearing holes below.

E. The planetary rollers apply force to the rotating shaft in the direction perpendicular to the axis of the rotating shaft, an elastic tensioner is installed in an installation hole of the shell in the direction perpendicular to the axis of the rotating shaft, then downward force is applied to the elastic tensioner in the installation hole, and the elastic tensioner applies pretightening force to the planetary rollers above to enable the planetary rollers above to vertically move downwards, so that the three planetary rollers are pressed on the rotating shaft.

Due to the adoption of the technical scheme, the invention has the following beneficial effects:

1. The invention sets at least three planetary rollers around the rotation shaft as center at the original position of the rotation shaft, which replaces the bearing to apply the acting force perpendicular to the axis direction of the rotation shaft, thus providing stable radial support for the rotation shaft, greatly improving the rotation speed and bearing capacity of the rotation shaft, and having the characteristics of simple structure, convenient manufacture and low cost.

2. The planetary rollers above the rotating shaft are movably arranged on the shell, and the planetary rollers below the rotating shaft are fixed on the shell, so that the plurality of 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 defined as N) is larger than the outer diameter of the rotating shaft (the outer diameter of the rotating shaft is defined as D), the ratio between the outer diameter N of the planetary roller and the outer diameter D of the rotating shaft is determined, and the ratio of the rotating shaft rotating speed to the rotating speed of the planetary roller bearing is calculated by a reduction ratio calculation formula of N/D=P. When the rotation speed of the rotation shaft is constant and the outer diameter of the rotation shaft is constant, the larger the P value is, the lower the rotation speed of the planetary roller bearing is. If the rotating speed of the rotating shaft of the high-speed motor is designed to be 120000rpm, 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 rotating speed of the roller support bearing is only 24000rpm, so that the rotating speed load and the processing difficulty of the roller support bearing are greatly reduced, and the possibility of replacing the original high-grade precision bearing by the bearing of the common grade is realized.

4. The invention forms an axial thrust support between the planetary roller and the rotating shaft for limiting the axial movement of the rotating shaft.

Drawings

The invention is further described below with reference to the accompanying drawings:

FIG. 1 is a schematic diagram of a prior art structure;

FIG. 2 is a schematic structural view of a planetary gear supporting device for a main shaft of a high-speed motor;

FIG. 3 is a schematic diagram of the spring tensioner of the present invention applying a preload to the bearings on the planetary rollers;

FIG. 4 is a schematic view of the structure of the planetary rollers of the present invention circumferentially distributed on the rotating shaft in the same plane;

FIG. 5 is a schematic view of the structure of the planetary rollers of the present invention in different planes distributed on the rotation axis;

FIG. 6 is a schematic view of a partial structure of the planetary rollers of the present invention in different planes distributed on the rotation axis;

FIG. 7 is a schematic view of a planetary roller according to the present invention;

FIG. 8 is a left side view of FIG. 7;

FIG. 9 is a schematic view of a rotating shaft according to the present invention;

FIG. 10 is a schematic view of three planetary rollers of the same size circumferentially distributed on a rotating shaft in the same plane;

FIG. 11 is a schematic view of three planetary rollers of different sizes circumferentially distributed on a rotating shaft in the same plane;

FIG. 12 is a schematic view of the spring tensioner of the present invention applying a preload to one planetary roller above;

FIG. 13 is a schematic view of the spring tensioner of the present invention applying a preload to the upper two planetary rollers;

FIG. 14 is a schematic view of an axial thrust support employing cylindrical planetary rollers in accordance with the present invention;

FIG. 15 is a schematic view of an axial thrust support employing stepped planetary rollers in accordance with the present invention;

FIG. 16 is a schematic view of an axial thrust support employing conical planetary rollers in accordance with the present invention;

FIG. 17 is a schematic view of an axial thrust support employing wedge-shaped planetary rollers in accordance with the present invention;

Fig. 18 is a schematic structural view of an axial thrust support mode using arc planetary rollers in the present invention.

In the figures, 1-rotation axis, 2-shell, 3-elastic tensioner, 4-mounting hole, 5-planetary roller, 6-bearing, 7-roller thrust surface, 8-rotation axis thrust surface.

Detailed Description

As shown in fig. 2 to 18, the supporting device for the planetary gear of the spindle of the high-speed motor according to the present invention comprises a housing 2 and a rotating shaft 1, wherein the rotating shaft 1 is installed in the housing 2.

The invention further comprises at least three planetary rollers 5 mounted on the housing 2, the planetary rollers 5 being arranged circumferentially about the axis of rotation 1. 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 bearings, so that acting force perpendicular to the axis direction of the rotating shaft 1 is applied to the rotating shaft 1, stable radial support is provided for the rotating shaft 1, the rotating speed and bearing capacity of the rotating shaft 1 can be greatly improved, and the novel planetary roller rotating shaft has the characteristics of simple structure, convenience in manufacturing and low cost.

The planetary rollers 5 above the rotation shaft 1 are movably mounted on the housing 2, and the planetary rollers 5 below the rotation shaft 1 are fixed on the housing 2, so that the plurality of planetary rollers 5 provide more stable radial support for the rotation shaft 1. The planetary roller 5 is specifically arranged in such a way that the shell 2 is provided with a mounting hole 4 perpendicular to the axis direction of the rotating shaft 1, an elastic tensioner 3 is movably connected in the mounting hole 4, and the elastic tensioner 3 applies a pretightening force to the planetary roller 5 above to enable the planetary roller 5 above to press the rotating shaft 1. The elastic tensioner 3 is generally divided into a connecting part and an elastic part, the elastic part is made of elastic materials, the mode of applying pretightening force to the upper planetary roller 5 can be (1) the mounting hole 4 is a hole with a smooth inner wall, the elastic part acts on the upper planetary roller 5 by applying downward acting force to the elastic tensioner 3 through a pushing structure, the elastic part acts on the upper planetary roller 5 and deforms, pretightening force can be applied to the upper planetary roller 5, the upper planetary roller 5 is firmly pressed on the rotating shaft 1, the mounting hole 4 is designed to be a hole with threads, the connecting part of the elastic tensioner 3 is also provided with threads, the connecting part is connected in the mounting hole 4 in a threaded manner, the elastic tensioner 3 moves downward by screwing the connecting part, the elastic part acts on the upper planetary roller 5, and deformation occurs, the pretightening force can be applied to the upper planetary roller 5, and the upper planetary roller 5 is firmly pressed on the rotating shaft 1. Through the structure, the rotating shaft 1 can be limited to rotate in the middle of the included angles of the plurality of rollers, so that the plurality of planetary rollers 5 provide more stable radial support for the rotating shaft 1. Because the planetary roller 5 is required to be fixed in the shell 2, the front end and the rear end of the planetary roller 5 are provided with the bearings 6, meanwhile, the shell 2 is provided with bearing holes corresponding to the bearings 6, the bearings 6 on the lower planetary roller 5 are matched with the bearing holes below, namely, the outer surfaces of the bearings 6 on the lower planetary roller 5 are attached to the inner sides of the bearing holes. There is the clearance that moves between bearing 6 on the planetary roller 5 of top and the bearing hole of top, and the elasticity tensioning ware 3 applys the pretightning force to bearing 6 on the planetary roller 5 of top for the elasticity tensioning ware 3 applys the node setting of pretightning force to planetary roller 5 in the inside of casing 2, plays the guard action, makes elasticity tensioning ware 3 applys pretightning force reliable, safe to planetary roller 5. The width of the planetary roller 5 can be freely set according to the working condition requirement.

The outer diameter of the planetary roller 5 (the outer diameter of the planetary roller 5 is defined as N) is generally larger than the outer diameter of the rotating shaft 1 (the outer diameter of the rotating shaft 1 is defined as D), the ratio 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 rotating shaft 1 to the rotating speed of the planetary roller 5 bearing 6, and the reduction ratio calculation formula is N/d=p. When the rotation speed of the rotation shaft 1 is constant and the outer diameter of the rotation shaft 1 is constant, the larger the P value is, the lower the rotation speed of the bearing 6 of the planetary roller 5 is. If the rotation speed of the rotation shaft 1 of the high-speed motor is designed to be 120000rpm, the outer diameter of the rotation shaft 1 is 15 mm, and the outer diameter of the planetary roller 5 is 75 mm, the P value is calculated to be 5, and the rotation speed of the roller support bearing 6 is only 24000rpm, so that the rotation speed load and the processing difficulty of the roller support bearing 6 are greatly reduced, and the possibility of replacing the original high-grade precision bearing by the bearing of the common grade is realized.

The planetary rollers 5 are circumferentially distributed on the rotating shaft 1 on the same plane, the number of the planetary rollers 5 below the rotating shaft 1 is at least two, and the included angle between the two planetary rollers 5 below the rotating shaft 1 is larger than 0 degree and smaller than 180 degrees, so that the effects of simple structure and convenience in manufacturing are achieved. The number and distribution of the planetary rollers 5 are specifically designed, namely three planetary rollers 5 are circumferentially distributed on the rotating shaft 1 on the same plane, the sizes of the three planetary rollers 5 are the same, and an included angle between the two planetary rollers 5 is 120 degrees. When the rotation speed of the rotation shaft 1 is low and the limit rotation speed of the bearing 6 of the planetary roller 5 is high, and the P value is excessive, the three planetary rollers 5 on the same supporting surface are generally used as a group, in order to pursue the maximization of the P value, the three planetary rollers 5 are generally uniformly distributed and arranged along the circumferential direction by 120 degrees, the three planetary rollers 5 are the same in size, and when the three planetary rollers 5 with the same size are uniformly distributed along the same plane by 120 degrees, the P value of 6.45 can be obtained at most, as shown in fig. 10, t1=t2=120 degrees. Different sizes can be set for each planetary roller 5 according to the requirement, and the peripheral angles can be uniformly distributed and arranged at different angles from 120 degrees, as shown in fig. 11, and T4 is more than T3. When the rotation speed of the rotation shaft 1 is high and the limit rotation speed of the bearing 6 of the planetary roller 5 is low and the P value is insufficient, different supporting surfaces can be selected, and the diameter of the planetary roller 5 is increased to increase the P value, that is, the planetary roller 5 is not supported on the rotation shaft 1 in a plane, and an infinite P value can be theoretically obtained, as shown in fig. 5 and 6. Four planetary rollers 5 may be provided to radially support the rotation shaft 1 according to the size of the planetary rollers 5, as shown in fig. 13.

An axial thrust support is formed between the planetary rollers 5 and the rotary shaft 1 for restricting axial movement of the rotary shaft 1. The axial thrust supporting mode is specifically divided into a cylindrical planetary roller (fig. 14), a stepped planetary roller (fig. 15), a conical planetary roller (fig. 16), a wedge-shaped planetary roller 5 (fig. 17) and a circular arc planetary roller (fig. 18), and specifically comprises the following steps:

(1) The cylindrical planetary roller 5 is characterized in that the edge of the planetary roller 5 is provided with a convex roller thrust surface 7, and the roller thrust surface 7 can be provided with two sides or only one side. The edge of the rotating shaft 1 is provided with a convex rotating shaft thrust surface 8, and the roller thrust surface 7 is contacted with the rotating shaft thrust surface 8 to provide a unidirectional thrust effect for the rotating shaft 1.

(2) The stepped planetary roller 5 is characterized in that a roller thrust surface 7 in a stepped shape is arranged at the edge of the planetary roller 5, a rotating shaft thrust surface 8 matched with the roller thrust surface 7 in a stepped shape is arranged at the edge of the rotating shaft 1, and the roller thrust surface 7 is contacted with the rotating shaft thrust surface 8 to provide a unidirectional thrust effect for the rotating shaft 1.

(3) The shape of the planetary roller 5 is designed into a conical shape, the outer surface of the planetary roller 5 is used as a roller conical surface, a first bulge part in the conical shape is arranged at the edge of the rotating shaft 1, the outer surface of the first bulge part is used as a conical surface of the rotating shaft 1, the taper of the roller conical surface is opposite to that of the conical surface of the rotating shaft 1, the roller conical surface is matched with the conical surface of the rotating shaft 1, no special thrust surface is needed between the planetary roller 5 and the planetary roller, and a unidirectional thrust effect is provided for the rotating shaft 1.

(4) The wedge-shaped planetary roller 5 is characterized in that the planetary roller 5 is in wedge-shaped limiting connection with the rotating shaft 1, wedge-shaped grooves are formed in the planetary roller 5, protrusions are arranged on the rotating shaft 1 to form a wedge shape, so that the protrusions on the rotating shaft 1 are matched with the grooves on the planetary roller 5, or wedge-shaped grooves are formed in the rotating shaft 1, protrusions are arranged on the planetary roller 5 to form a wedge shape, so that the protrusions on the planetary roller 5 are matched with the grooves on the rotating shaft 1. No special thrust surface is needed between the planetary rollers 5 and the planetary rollers, and a bidirectional thrust effect is provided for the rotating shaft 1.

(5) The arc planetary roller 5 is characterized in that the planetary roller 5 is provided with a first arc surface, the rotating shaft 1 is provided with a second arc surface opposite to the first arc surface, the second arc surface and the first arc surface are mutually matched, and a special thrust surface is not needed between the planetary roller 5 and the first arc surface, so that a bidirectional thrust effect is provided for the rotating shaft 1.

The supporting method of the high-speed motor spindle planet wheel supporting device comprises the following steps:

a. The shape of the planetary roller 5 is designed, and the shape of the rotating shaft 1 is designed 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 for limiting the axial movement of the rotating shaft 1.

The invention provides radial support for the rotating shaft 1 through a plurality of planetary rollers 5, and simultaneously forms axial thrust support between the planetary rollers 5 and the rotating shaft 1 for limiting the axial movement of the rotating shaft 1.

B. The outer diameter design of the planetary roller 5, the bearing 6 rotation speed of the planetary roller 5 is output, 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 ratio between the outer diameter N of the planetary roller 5 and the outer diameter D of the rotating shaft 1 is determined, the ratio of the rotation speed of the rotating shaft 1 to the rotation speed of the bearing 6 of the planetary roller 5 is determined, the value of the outer diameter N of the planetary roller 5 is adjusted according to a reduction ratio calculation formula P=N/D under the condition that the outer diameter D of the rotating shaft 1 is constant, and the rotation speed of the rotating shaft 1 is constant, so that the rotation speed of the bearing 6 of the planetary roller 5 is output.

When the rotation speed of the rotation shaft 1 is constant and the outer diameter of the rotation shaft 1 is constant, the larger the P value is, the lower the rotation speed of the planetary roller 5 bearing 6 is. If the rotation speed of the rotation shaft 1 of the high-speed motor is designed to be 120000rpm, the outer diameter of the rotation shaft 1 is 15 mm, and the outer diameter of the planetary roller 5 is 75 mm, the P value is calculated to be 5, and the rotation speed of the roller support bearing 6 is only 24000rpm, so that the rotation speed load and the processing difficulty of the roller support bearing 6 are greatly reduced, and the possibility of replacing the original high-grade precision bearing by the bearing of the common grade is realized.

C. The distribution condition of the planetary rollers 5 acting on the rotating shaft 1 is designed, namely, under the condition that the surplus reduction ratio P value is ensured, three planetary rollers 5 are designed to be circumferentially distributed on the rotating shaft 1 on the same plane, the sizes of the three planetary rollers 5 are the same, and the three planetary rollers 5 are uniformly distributed and arrayed in the circumferential direction by 120 degrees.

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

D. The planetary rollers 5 apply force to the rotating shaft 1, namely one planetary roller 5 above the rotating shaft 1 is movably designed on the shell 2, a bearing 6 on the upper planetary roller 5 is arranged in an upper bearing hole, a movable gap exists between the two planetary rollers, and meanwhile two planetary rollers 5 below the rotating shaft 1 are fixedly designed on the shell 2, and the bearing 6 on the lower planetary roller 5 is limited in the lower bearing hole.

E. The planetary rollers 5 apply a force to the rotating shaft 1 in a direction perpendicular to the axis of the rotating shaft 1, an elastic tensioner 3 is installed in an installation hole 4 of the shell 2 in a direction perpendicular to the axis of the rotating shaft 1, then a downward force is applied to the elastic tensioner 3 in the installation hole 4, and the elastic tensioner 3 applies a pretightening force to the planetary rollers 5 above, so that the planetary rollers 5 above vertically move downwards, and the three planetary rollers 5 are pressed on the rotating shaft 1.

The above is only a specific embodiment of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions or modifications and the like made on the basis of the present invention to solve the substantially same technical problems and achieve the substantially same technical effects are included in the scope of the present invention.

Claims

1. High-speed motor main shaft planet wheel strutting arrangement includes:

A housing;

a rotation shaft installed in the housing;

the method is characterized in that:

The planetary rollers are arranged around the rotating shaft as a center circumference, and apply acting force to the rotating shaft in the direction perpendicular to the axis of the rotating shaft;

The planetary roller above the rotating shaft moves on the shell, and the planetary roller below the rotating shaft is fixed on the shell;

the shell is provided with a mounting hole perpendicular to the axis direction of the rotating shaft, an elastic tensioner is movably connected in the mounting hole, and the elastic tensioner applies pretightening force to the planetary roller above to enable the planetary roller above to be pressed on the rotating shaft;

the elastic tensioner is divided into a connecting part and an elastic part, wherein the elastic part is made of elastic materials, and the mode of applying pretightening force to the planetary rollers above is one of the following modes:

the first mode is that the mounting hole is a hole with a smooth inner wall, a pushing structure is adopted to apply downward acting force to the elastic tensioner, the elastic tensioner can move downwards, so that the elastic part acts on the planetary roller above and deforms, and pretightening force can be applied to the planetary roller above;

The second mode is that the mounting hole is designed to be a hole with threads, the connecting part is provided with threads, the connecting part is connected in the mounting hole in a threaded manner, the elastic tensioner can move downwards by screwing the connecting part, and the elastic part acts on the planetary roller above and deforms, so that pretightening force can be applied to the planetary roller above;

the planet roller is characterized in that bearings are arranged at the front end and the rear end of the planet roller, bearing holes corresponding to the bearings are formed in the shell, the bearings on the planet roller at the lower part are matched with the bearing holes at the lower part, a movable gap exists between the bearings on the planet roller at the upper part and the bearing holes at the upper part, and the elastic tensioner applies pretightening force to the bearings on the planet roller at the upper part.

2. The apparatus of claim 1, wherein the outer diameter of the planetary roller is larger than the outer diameter of the rotating shaft.

3. The supporting device for planet wheels of a spindle of a high-speed motor according to claim 1 or 2, wherein the planet wheels are circumferentially distributed on the rotating shaft in the same plane, the number of the planet wheels below the rotating shaft is at least two, and an included angle between the two planet wheels below the rotating shaft is more than 0 degrees and less than 180 degrees.

4. The device for supporting the planet wheels of the spindle of the high-speed motor according to claim 3, wherein three planet wheels are circumferentially distributed on the rotating shaft in the same plane, the three planet wheels are identical in size, and an included angle between the two planet wheels is 120 degrees.

5. The apparatus of claim 1, wherein an axial thrust support is formed between the planetary rollers and the rotating shaft to restrict axial movement of the rotating shaft.

6. The supporting device for the planet wheel of the main shaft of the high-speed motor according to claim 5, wherein the axial thrust supporting mode is specifically divided into:

(1) The planetary roller edge is provided with a convex roller thrust surface, the rotating shaft edge is provided with a convex rotating shaft thrust surface, and the roller thrust surface is contacted with the rotating shaft thrust surface to provide a unidirectional thrust effect for the rotating shaft;

(2) The planetary roller edge is provided with a roller thrust surface in a step shape, the rotating shaft edge is provided with a rotating shaft thrust surface matched with the roller thrust surface in a step shape, and the roller thrust surface is contacted with the rotating shaft thrust surface to provide a unidirectional thrust effect for the rotating shaft;

(3) The shape of the planetary roller is designed into 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 protruding part in a conical shape, the outer surface of the first protruding part is used as a rotating shaft conical surface, the taper of the roller conical surface is opposite to that of the rotating shaft conical surface, and the roller conical surface is matched with the rotating shaft conical surface to provide a unidirectional thrust function for the rotating shaft;

(4) The planetary rollers are in wedge-shaped limiting connection with the rotating shaft, and a bidirectional thrust effect is provided for the rotating shaft;

(5) The planetary roller is provided with a first arc surface, the rotating shaft is provided with a second arc surface opposite to the first arc surface, and the second arc surface and the first arc surface are mutually matched to provide a bidirectional thrust effect for the rotating shaft.

7. The supporting method based on the high-speed motor spindle planetary gear supporting device as claimed in claim 1, characterized by comprising the following steps:

a. Designing the shape of the planetary roller, and designing 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 and used for limiting the axial movement of the rotating shaft;

b. the outer diameter design of the planetary roller is used for outputting the bearing rotating speed of the planetary roller, wherein the outer diameter of the planetary roller is defined as N, the outer diameter of a rotating shaft is defined as D, the ratio between the outer diameter N of the planetary roller and the outer diameter D of the rotating shaft is determined, the ratio of the rotating shaft rotating speed to the bearing rotating speed of the planetary roller is determined, the numerical value of the outer diameter N of the planetary roller is regulated according to a reduction ratio calculation formula P=N/D under the condition that the outer diameter D of the rotating shaft is constant, and the bearing rotating speed of the planetary roller is output through the constant rotating speed of the rotating shaft;

c. The distribution condition of the planetary rollers acting on the rotating shaft is designed, namely, under the condition that the surplus of the reduction ratio P value is ensured, three planetary rollers are designed to be circumferentially distributed on the rotating shaft on the same plane, the sizes of the three planetary rollers are the same, and the three planetary rollers are uniformly distributed and arrayed in the circumferential direction by 120 degrees;

d. The planetary rollers apply acting force to the rotating shaft, namely, one planetary roller above the rotating shaft is movably designed on the shell, a bearing on the upper planetary roller is arranged in a bearing hole above the planetary roller, a movable gap exists between the planetary roller and the bearing, two planetary rollers below the rotating shaft are fixedly designed on the shell, and the bearing on the lower planetary roller is limited in the bearing hole below the planetary roller;