A structure for preventing radial displacement of a gear

Abstract

The present invention discloses a structure for preventing radial displacement of gears, comprising: a motor gear unit, the motor gear unit including: a housing; a motor, a main cage and a protective cover are arranged inside the housing; a first transmission gear is in transmission connection with the motor; a second transmission gear is meshed with the first transmission gear; a third transmission gear is meshed with the second transmission gear; three first planetary gears are respectively meshed with the third transmission gear; the upper ends of three first transmission shafts are respectively connected with the three first planetary gears; three first gaskets are respectively abutted between the lower side of the main cage and the upper ends of the three first planetary gears; the lower ends of three first cages are respectively in transmission connection with three second planetary gears; the upper ends of three second transmission shafts are respectively connected with the three second planetary gears; three second gaskets are respectively abutted between the three second planetary gears and the second cage. In the present invention, the relative radial positions of the cages will not change, and the planetary gear train will not have radial offset.

Description

Technical Field

[0001] The present invention relates to the technical field of automobiles, and particularly to a structure for preventing radial movement of gears. Background Art

[0002] The main function of the planetary gear in the motor gear unit of the EPB caliper is to amplify the transmission ratio to provide the large torque clamping force required for parking. At present, when the motor gear unit of the EPB caliper on the market performs the parking brake operation, the motor rotates, drives the transmission gear train and the planetary gear train to transmit, and then drives the cage to output torque, clamp the brake disc to achieve parking. Due to the action of gravity when the motor gear unit is static, the entire planetary gear train will shift downward, and when the motor gear unit is working, due to the relatively large load, the planetary gear train will shift to one side, resulting in uneven wear of the gears and generating eccentric wear, causing transmission vibration and noise. Even after long-term wear, it cannot clamp the brake disc well, posing safety problems to vehicle drivers and passengers. Summary of the Invention

[0003] Aiming at the above problems existing in the existing motor gear unit structure, the present invention aims to provide a structure for preventing radial movement of gears. Even under a relatively large load, due to the high-precision fit clearance, the always unchanged multi-point balanced contact, and the compact structure setting, the radial relative position of the cage will not change, and the planetary gear train will not undergo radial displacement, greatly improving the eccentric wear of the gears and the noise caused by vibration, capable of increasing the service life of the gear unit, ensuring good clamping of the brake disc and guaranteeing the safety of the personnel in the vehicle.

[0004] The specific technical solution is as follows:

[0005] A structure for preventing radial movement of gears, comprising: a motor gear unit, and the motor gear unit includes:

[0006] A housing;

[0007] A motor, which is arranged in the housing;

[0008] A main cage, which is arranged in the housing;

[0009] A protective cover, which is arranged in the housing and is located below the main cage;

[0010] A first transmission gear, which is arranged between the upper side in the housing and the main cage, and the first transmission gear is in transmission connection with the motor;

[0011] A second transmission gear is disposed between the upper side inside the housing and the main cage, and the second transmission gear meshes with the first transmission gear;

[0012] A third transmission gear is disposed between the upper side inside the housing and the main cage, and the third transmission gear meshes with the second transmission gear;

[0013] A first cage is disposed between the main cage and the protective cover;

[0014] At least three first planetary gears are all disposed between the main cage and the first cage. The three first planetary gears respectively mesh with the third transmission gear, and the three first planetary gears are arranged at equal intervals along the circumferential direction of the third transmission gear;

[0015] At least three first transmission shafts. The upper ends of the three first transmission shafts are respectively connected to the three first planetary gears, and the lower ends of the three first transmission shafts are fixedly connected to the first cage;

[0016] At least three first gaskets are respectively sleeved on the upper ends of the three first transmission shafts, and the three first gaskets respectively abut between the lower side of the main cage and the upper ends of the three first planetary gears;

[0017] A second cage is disposed between the first cage and the protective cover;

[0018] At least three second planetary gears are all disposed between the first cage and the second cage. The lower ends of the three first cages are respectively in transmission connection with the three second planetary gears;

[0019] At least three second transmission shafts. The upper ends of the three second transmission shafts are respectively connected to the three second planetary gears, and the lower ends of the three second transmission shafts respectively pass through the second cage;

[0020] At least three second gaskets are respectively sleeved on the three second transmission shafts, and the three second gaskets respectively abut between the three second planetary gears and the second cage.

[0021] The above structure for preventing radial runout of gears, wherein, further comprising:

[0022] A first fixed shaft. The upper end of the first fixed shaft is rotatably connected to the upper side inside the housing, the lower end of the first fixed shaft is fixedly connected to the main cage, and the second transmission gear is rotatably connected to the first fixed shaft;

[0023] The first rotating shaft, the upper end of the first rotating shaft is rotatably connected to the upper side inside the housing, the lower end of the first rotating shaft passes through the first cage and is rotatably connected to the second cage, and the third transmission gear is rotatably connected to the first rotating shaft.

[0024] The above structure for preventing radial movement of the gear, wherein the housing includes: an end cover and a lower housing, and a receiving space is formed between the end cover and the lower housing;

[0025] A first annular groove and a first groove are provided on the peripheral wall of the lower end of the end cover, the first groove is located inside the first annular groove, and a rubber gasket is provided in the first groove;

[0026] A flange is provided on the peripheral wall of the upper end of the lower housing, the flange is fixedly welded to the first annular groove, a first through hole is provided on the lower housing, the first through hole is communicated with the receiving space, a first step is provided on the peripheral wall of the lower housing where the first through hole is located, and a second step is provided on the inner wall of one end of the lower housing, and the second step is located above the first step;

[0027] The upper side of one end of the main cage abuts against the rubber gasket, the lower side of one end of the main cage is in limit fit with the second step, a second through hole is longitudinally penetrated through one end of the main cage, a third step and a fourth step are provided on the upper side of the main cage, a second groove is formed between the third step and the first protrusion, the upper end of the second through hole is communicated with the second groove, a second annular groove is formed at the lower end of the third transmission gear, the upper side of the main cage extends into the second annular groove, the peripheral wall of the lower end of the third transmission gear is axially limited by the fourth step, a first through slot is provided in the middle of the main cage, and a first receiving groove, a second receiving groove and a third receiving groove which are communicated with each other are sequentially provided on the lower side of the main cage from top to bottom, the first receiving groove is communicated with the first through slot, the inner diameter of the first receiving groove is smaller than the inner diameter of the second receiving groove, the inner diameter of the second receiving groove is smaller than the inner diameter of the third receiving groove, three first planetary gears and three first gaskets are all arranged in the first receiving groove, the first cage and three second planetary gears are all arranged in the second receiving groove, three second gaskets and the upper end of the second cage are all arranged in the third receiving groove, and the lower end of the second cage extends into the first through hole;

[0028] A fifth step is provided on the lower side of the protective cover. The fifth step is in limiting cooperation with the first step. A hook is provided at one end of the protective cover. The hook passes through the second through hole, extends into the second groove, and is in snap-fit cooperation with the third step. A second through groove is provided in the middle of the protective cover. The middle of the lower end of the third transmission gear passes through the first through groove and extends into the first accommodation groove. The middle of the lower end of the third transmission gear is axially limited with the first cage. A sixth step is provided on the peripheral wall of the second cage. The sixth step is in limiting cooperation with the inner circumference of the protective cover at the second through groove. The lower end of the second cage passes through the second through groove.

[0029] In the above structure for preventing the radial displacement of the gear, at the other end of the main cage, a third through groove is provided. The motor is installed between the other end of the main cage and the other end of the lower housing. The driving shaft of the motor passes through the third through groove and is in transmission connection with the first transmission gear. On the upper side inside the end cover, a first rotation groove and a second rotation groove are provided. In the middle of the second cage, a third rotation groove is provided. The upper end of the first fixed shaft is rotationally connected to the first rotation groove. The lower end of the first fixed shaft extends into the main cage and is fixedly connected to the main cage. The upper end of the first rotating shaft is rotationally connected to the second rotation groove. The lower end of the first rotating shaft is rotationally connected to the third rotation groove.

[0030] In the above structure for preventing the radial displacement of the gear, further included is: a brake caliper, and the brake caliper includes:

[0031] A caliper body, which is fixedly connected to the motor gear unit;

[0032] An adjustment assembly, which is installed on the caliper body, is rotationally connected to the caliper body, and is fixedly connected to the motor gear unit through a spline;

[0033] A piston, which is installed inside the caliper body;

[0034] A bracket, which is used to be fixed on the vehicle chassis assembly;

[0035] Two friction plates, both of which are installed on the bracket, and the two friction plates are respectively slidably connected to the bracket.

[0036] The positive effects of the above technical solution compared with the prior art are:

[0037] Even under a large load, due to the high-precision fit clearance, the always unchanged multi-point balanced contact, and the compact structure setting of the present invention, the relative radial position of the cage is ensured not to change, and the planetary gear train will not have a radial offset, greatly improving the noise caused by the eccentric wear and vibration of the gears, capable of increasing the service life of the gear unit, ensuring good clamping of the brake disc and guaranteeing the safety of the personnel in the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 FIG. is a schematic structural diagram of the motor gear unit in a structure for preventing radial movement of gears according to the present invention;

[0039] Figure 2 FIG. is a schematic structural diagram of the brake caliper in a structure for preventing radial movement of gears according to the present invention;

[0040] In the drawings: 1, housing; 2, motor; 3, main cage; 4, protective cover; 5, first transmission gear; 6, second transmission gear; 7, third transmission gear; 8, first cage; 9, first planetary gear; 10, first transmission shaft; 11, first gasket; 12, second cage; 13, second planetary gear; 14, second transmission shaft; 15, second gasket; 16, first fixed shaft; 17, first rotating shaft; 18, end cover; 19, lower housing; 20, first annular groove; 21, first groove; 22, flange; 23, first step; 24, second step; 25, rubber gasket; 26, third step; 27, fourth step; 28, second groove; 29, first through hole; 30, second through hole; 31, second annular groove; 32, first through slot; 33, first accommodating groove; 34, second accommodating groove; 35, third accommodating groove; 36, fifth step; 37, catch; 38, second through slot; 39, sixth step; 40, seventh step; 41, third through slot; 42, first rotating groove; 43, second rotating groove; 45, third rotating groove; 71, caliper body; 72, adjusting assembly; 73, piston; 74, bracket; 75, friction plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0041] The present invention will be further described below in conjunction with the drawings and specific embodiments, but it is not intended to limit the present invention.

[0042] Figure 1 FIG. is a schematic structural diagram of the motor gear unit in a structure for preventing radial movement of gears according to the present invention, Figure 2 FIG. is a schematic structural diagram of the brake caliper in a structure for preventing radial movement of gears according to the present invention, as Figure 1 and Figure 2As shown in the figure, a structure for preventing radial movement of a gear in a preferred embodiment is shown, which includes: a motor gear unit, and the motor gear unit includes: a housing 1, a motor 2, a main cage 3, a protective cover 4, a first transmission gear 5, a second transmission gear 6, and a third transmission gear 7. The motor 2 is arranged inside the housing 1, the main cage 3 is arranged inside the housing 1, the protective cover 4 is arranged inside the housing 1, the protective cover 4 is located below the main cage 3, the first transmission gear 5 is arranged between the upper side inside the housing 1 and the main cage 3, the first transmission gear 5 is in transmission connection with the motor 2, the second transmission gear 6 is arranged between the upper side inside the housing 1 and the main cage 3, the second transmission gear 6 meshes with the first transmission gear 5, the third transmission gear 7 is arranged between the upper side inside the housing 1 and the main cage 3, and the third transmission gear 7 meshes with the second transmission gear 6.

[0043] Further, as a preferred embodiment, the structure for preventing radial movement of the gear further includes: a first cage 8, at least three first planetary gears 9, at least three first transmission shafts 10, at least three first gaskets 11, a second cage 12, at least three second planetary gears 13, at least three second transmission shafts 14, and at least three second gaskets 15. The first cage 8 is arranged between the main cage 3 and the protective cover 4. The three first planetary gears 9 are all arranged between the main cage 3 and the first cage 8. The three first planetary gears 9 respectively mesh with the third transmission gear 7. The three first planetary gears 9 are respectively arranged at equal intervals along the circumferential direction of the third transmission gear 7. The upper ends of the three first transmission shafts 10 are respectively connected to the three first planetary gears 9. The lower ends of the three first transmission shafts 10 are respectively fixedly connected to the first cage 8. The three first gaskets 11 are respectively sleeved on the upper ends of the three first transmission shafts 10. The three first gaskets 11 respectively abut between the lower side of the main cage 3 and the upper ends of the three first planetary gears 9. The second cage 12 is arranged between the first cage 8 and the protective cover 4. The three second planetary gears 13 are all arranged between the first cage 8 and the second cage 12. The lower ends of the three first cages 8 are respectively in transmission connection with the three second planetary gears 13. The upper ends of the three second transmission shafts 14 are respectively connected to the three second planetary gears 13. The lower ends of the three second transmission shafts 14 respectively pass through the second cage 12. The three second gaskets 15 are respectively sleeved on the three second transmission shafts 14. The three second gaskets 15 respectively abut between the three second planetary gears 13 and the second cage 12. The three second planetary gears 13 are arranged at equal intervals along the circumferential direction of the first cage 8.

[0044] Further, as a preferred embodiment, the structure for preventing the radial movement of the gear further includes: a first fixed shaft 16 and a first rotating shaft 17. The upper end of the first fixed shaft 16 is rotatably connected to the upper side inside the housing 1, the lower end of the first fixed shaft 16 is fixedly connected to the main cage 3, the second transmission gear 6 is rotatably connected to the first fixed shaft 16, the upper end of the first rotating shaft 17 is rotatably connected to the upper side inside the housing 1, the lower end of the first rotating shaft 17 passes through the first cage 8 and is rotatably connected to the second cage 12, and the third transmission gear 7 is rotatably connected to the first rotating shaft 17.

[0045] Further, as a preferred embodiment, the housing includes: an end cover 18 and a lower housing 19. An accommodation space is formed between the end cover 18 and the lower housing 19.

[0046] Further, as a preferred embodiment, a first annular groove 20 and a first groove 21 are provided on the peripheral wall of the lower end of the end cover 18. The first groove 21 is located inside the first annular groove 20, and a rubber gasket 25 is provided in the first groove 21.

[0047] Further, as a preferred embodiment, a flange 22 is provided on the peripheral wall of the upper end of the lower housing 19. The flange 22 is fixedly welded to the first annular groove 20. A first through hole 29 is provided on the lower housing 19, and the first through hole 29 is communicated with the accommodation space. A first step 23 is provided on the peripheral wall of the lower housing 19 at the first through hole, and a second step 24 is provided on the inner wall of one end of the lower housing 19. The second step 24 is located above the first step 23.

[0048] Further, as a preferred embodiment, the upper side of one end of the main cage 3 abuts against the rubber gasket 25, the lower side of one end of the main cage 3 is in limiting fit with the second step 24, a second through hole 30 runs longitudinally through one end of the main cage 4, the upper side of the main cage 3 is provided with a third step 26 and a fourth step 27, a second groove 28 is formed between the third step 26 and the first protrusion 25, the upper end of the second through hole 30 communicates with the second groove 28, a second annular groove 31 is formed at the lower end of the third transmission gear 7, the upper side of the main cage 3 extends into the second annular groove 31, the peripheral wall at the lower end of the third transmission gear 7 is axially limited by the fourth step 27, a first through slot 32 is provided in the middle of the main cage 3, the lower side of the main cage 3 is successively provided with a first accommodating groove 33, a second accommodating groove 34 and a third accommodating groove 35 which communicate with each other from top to bottom, the first accommodating groove 33 communicates with the first through slot 32, the inner diameter of the first accommodating groove 33 is smaller than that of the second accommodating groove 34, and the inner diameter of the second accommodating groove 34 is smaller than that of the third accommodating groove 35. Three first planetary gears 9 and three first gaskets 11 are both arranged in the first accommodating groove 33, the first cage 8 and three second planetary gears 13 are both arranged in the second accommodating groove, the upper ends of three second gaskets 15 and the second cage 12 are both arranged in the third accommodating groove 25, and the lower end of the second cage 12 extends into the first through hole 29. Preferably, the outer periphery of the upper end of the first cage 8 is in clearance fit with the peripheral wall of the first accommodating groove 33, a seventh step 40 is provided on the outer periphery of the lower end of the first cage 8, the second planetary gear 13 is located between the seventh step 40 and the peripheral wall of the second accommodating groove 34, and the upper end of the second planetary gear 13 is in limiting fit with the seventh step 40.

[0049] Further, as a preferred embodiment, the lower side of the protective cover 4 is provided with a fifth step 36, the fifth step 36 is in limiting fit with the first step 23, one end of the protective cover 4 is provided with a hook 37, the hook 37 passes through the second through hole 30, extends into the second groove 28, and is in snap fit with the third step 26, a second through slot 38 is provided in the middle of the protective cover 4, the middle of the lower end of the third transmission gear 7 passes through the first through slot 32 and extends into the first accommodating groove 33, the middle of the lower end of the third transmission gear 7 is axially limited by the first cage 8, a sixth step 39 is provided on the peripheral wall of the second cage 12, the sixth step 39 is in limiting fit with the inner periphery of the protective cover 4 located in the second through slot 38, and the lower end of the second cage 12 passes through the second through slot 38.

[0050] Further, as a preferred embodiment, the other end of the main cage 3 is provided with a third through groove 41. The motor 2 is installed between the other end of the main cage 3 and the other end of the lower housing 19. The drive shaft of the motor 2 passes through the third through groove 41 and is in transmission connection with the first transmission gear 5. The upper side inside the end cover 18 is provided with a first rotation groove 42 and a second rotation groove 43. The middle part of the second cage 12 is provided with a third rotation groove 45. The upper end of the first fixed shaft 16 is rotationally connected to the first rotation groove 42. The lower end of the first fixed shaft 16 extends into the main cage 3 and is fixedly connected to the main cage 3. The upper end of the first rotating shaft 17 is rotationally connected to the second rotation groove 43. The lower end of the first rotating shaft 17 is rotationally connected to the third rotation groove 45.

[0051] The above are only the preferred embodiments of the present invention, and do not limit the implementation manners and protection scope of the present invention accordingly.

[0052] The present invention also has the following implementation manners on the above basis:

[0053] In a further embodiment of the present invention, please continue to refer to Figure 1 、 Figure 2 As shown, the structure for preventing the radial movement of the gear further includes: a brake caliper, and the brake caliper includes: a caliper body 71, an adjustment assembly 72, a piston 73, a bracket 74, and a friction plate 75. The caliper body 71 is fixedly connected to the motor gear unit. The adjustment assembly 72 is installed on the caliper body 71. The adjustment assembly 72 is rotationally connected to the caliper body 71. The adjustment assembly 72 is fixedly connected to the motor gear unit through a spline. The piston 73 is installed inside the caliper body 71. The bracket 74 is used to be fixed on the vehicle chassis assembly. The friction plate 75 is installed on the bracket 74. The friction plate 75 is slidably connected to the bracket 74.

[0054] Even under large loads, due to the high-precision fit clearance, the always unchanged multi-point balanced contact, and the compact structure setting of the present invention, the relative radial position of the cage is ensured not to change, and the planetary gear train will not have radial offset. Through the three first gaskets 11 and the three second gaskets 15, the uneven wear of the gear and the noise caused by vibration are greatly improved, the service life of the gear unit can be increased, and the brake disc can be well clamped and the safety of the vehicle occupants can be ensured.

[0055] The above are only the preferred embodiments of the present invention, and do not limit the implementation manners and protection scope of the present invention accordingly. For those skilled in the art, it should be realized that all the equivalent replacements and obvious changes made by using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A structure for preventing radial displacement of a gear, characterized in that, it includes: a motor gear unit, and the motor gear unit includes: a housing; a motor, and the motor is arranged in the housing; a main cage, and the main cage is arranged in the housing; a protective cover, and the protective cover is arranged in the housing, and the protective cover is located below the main cage; a first transmission gear, and the first transmission gear is arranged between the upper side in the housing and the main cage, and the first transmission gear is in transmission connection with the motor; a second transmission gear, and the second transmission gear is arranged between the upper side in the housing and the main cage, and the second transmission gear meshes with the first transmission gear; a third transmission gear, and the third transmission gear is arranged between the upper side in the housing and the main cage, and the third transmission gear meshes with the second transmission gear; a first cage, and the first cage is arranged between the main cage and the protective cover; at least three first planetary gears, and the three first planetary gears are all arranged between the main cage and the first cage, and the three first planetary gears respectively mesh with the third transmission gear, and the three first planetary gears are respectively arranged at equal intervals along the circumferential direction of the third transmission gear; at least three first transmission shafts, and the upper ends of the three first transmission shafts are respectively connected to the three first planetary gears, and the lower ends of the three first transmission shafts are respectively fixedly connected to the upper end of the first cage; at least three first gaskets, and the three first gaskets are respectively sleeved on the upper ends of the three first transmission shafts, and the three first gaskets respectively abut between the lower side of the main cage and the upper ends of the three first planetary gears; a second cage, and the second cage is arranged between the first cage and the protective cover; at least three second planetary gears, and the three second planetary gears are all arranged between the upper end of the first cage and the second cage, and the lower ends of the three first cages are respectively in transmission connection with the three second planetary gears; at least three second transmission shafts, and the upper ends of the three second transmission shafts are respectively connected to the three second planetary gears, and the lower ends of the three second transmission shafts respectively pass through the second cage; at least three second gaskets, and the three second gaskets are respectively sleeved on the three second transmission shafts, and the three second gaskets respectively abut between the three second planetary gears and the second cage; It further includes: a first fixed shaft, and the upper end of the first fixed shaft is rotatably connected to the upper side in the housing, and the lower end of the first fixed shaft is fixedly connected to the main cage, and the second transmission gear is rotatably connected to the first fixed shaft; a first rotating shaft, and the upper end of the first rotating shaft is rotatably connected to the upper side in the housing, and the lower end of the first rotating shaft passes through the first cage and is rotatably connected to the second cage, and the third transmission gear is rotatably connected to the first rotating shaft.

2. The structure for preventing radial displacement of a gear according to claim 1, characterized in that, The housing includes: an end cover and a lower housing, and an accommodation space is formed between the end cover and the lower housing; On the peripheral wall at the lower end of the end cover, a first annular groove and a first groove are provided. The first groove is located inside the first annular groove, and a rubber gasket is arranged in the first groove; On the peripheral wall at the upper end of the lower housing, a flange is provided. The flange is fixedly welded to the first annular groove. A first through hole is provided on the lower housing, and the first through hole communicates with the accommodation space. On the peripheral wall of the lower housing where the first through hole is located, a first step is provided. On the inner wall at one end of the lower housing, a second step is provided, and the second step is located above the first step; The upper side of one end of the main cage abuts against the rubber gasket, and the lower side of one end of the main cage is in limit fit with the second step. A second through hole is longitudinally penetrated through one end of the main cage. On the upper side of the main cage, a third step and a fourth step are provided. A second groove is formed between the third step and the first protrusion. The upper end of the second through hole communicates with the second groove. A second annular groove is formed at the lower end of the third transmission gear. The upper side of the main cage extends into the second annular groove. A first through slot is provided in the middle of the main cage. From top to bottom on the lower side of the main cage, a first accommodation groove, a second accommodation groove and a third accommodation groove which are communicated with each other are provided in sequence. The first accommodation groove communicates with the first through slot. The inner diameter of the first accommodation groove is smaller than the inner diameter of the second accommodation groove. The inner diameter of the second accommodation groove is smaller than the inner diameter of the third accommodation groove. The three first planetary gears and the three first gaskets are all arranged in the first accommodation groove. The first cage and the three second planetary gears are all arranged in the second accommodation groove. The three second gaskets and the upper end of the second cage are all arranged in the third accommodation groove. The lower end of the second cage extends into the first through hole; On the lower side of the protective cover, a fifth step is provided. The fifth step is in limit fit with the first step. At one end of the protective cover, a hook is provided. The hook passes through the second through hole, extends into the second groove, and is in snap fit with the third step. A second through slot is provided in the middle of the protective cover. The middle part of the lower end of the third transmission gear passes through the first through slot and extends into the first accommodation groove. The middle part of the lower end of the third transmission gear is axially limited with the first cage. On the peripheral wall of the second cage, a sixth step is provided. The sixth step is in limit fit with the inner periphery of the protective cover where the second through slot is located. The lower end of the second cage passes through the second through slot.

3. The structure for preventing radial displacement of gears according to claim 2, wherein, The other end of the main cage is provided with a third through groove. The motor is installed between the other end of the main cage and the other end of the lower housing. The driving shaft of the motor passes through the third through groove and is in transmission connection with the first transmission gear. The upper side inside the end cover is provided with a first rotating groove and a second rotating groove. The middle part of the second cage is provided with a third rotating groove. The upper end of the first fixed shaft is rotatably connected to the first rotating groove. The lower end of the first fixed shaft extends into the main cage and is fixedly connected to the main cage. The upper end of the first rotating shaft is rotatably connected to the second rotating groove. The lower end of the first rotating shaft is rotatably connected to the third rotating groove.

4. The structure for preventing radial movement of a gear according to claim 1, characterized in that, further comprising: a brake caliper, the brake caliper comprising: a caliper body, the caliper body being fixedly connected to the motor gear unit; an adjusting assembly, the adjusting assembly being installed on the caliper body, the adjusting assembly being rotatably connected to the caliper body, and the adjusting assembly being fixedly connected to the motor gear unit by a spline; a piston, the piston being installed inside the caliper body; a bracket, the bracket being used for fixing on the vehicle chassis assembly; two friction plates, both of the two friction plates being installed on the bracket, and the two friction plates being respectively slidably connected to the bracket.

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