A planetary gear reduction box structure for a rearview mirror lens driver

Abstract

The present application provides a planetary gear reducer structure of a rearview mirror lens driver, which relates to the technical field of reducer boxes, and includes a housing including a reducer lower cover and a reducer upper cover, wherein the reducer upper cover is rotatably buckled on the opening of the reducer lower cover; a planetary gear assembly includes an input shaft rotatably plugged in the middle of the reducer lower cover, a sun gear fixedly sleeved on the input shaft, a plurality of double-layer planetary gears spaced along the circumference of the sun gear, a first gear ring fixed in the reducer lower cover, a second gear ring fixed in the reducer upper cover, and an output wheel fixed in the middle of the outer end surface of the reducer upper cover, wherein the double-layer planetary gear includes a first gear meshing with the first gear ring and the sun gear and a second gear meshing with the second gear ring; a motor, wherein the output end is fixedly connected to the input shaft; and a limit structure can limit the shaking of the reducer lower cover relative to the motor. The present application has the effect of improving the smoothness of the operation of the planetary gear reducer.

Description

Technical Field

[0001] The present application relates to the technical field of reduction gear boxes, and in particular to a planetary gear reduction gear box structure for a rearview mirror lens driver. Background Art

[0002] The automobile rearview mirror provides a good side and rear view for the automobile during its travel. The existing automobile rearview mirror needs to be adjusted in angle according to the needs of the driver, so as to meet the best side and rear view for different drivers. The automobile rearview mirror driver usually connects the rearview mirror to a floating plate, and the transmission rack is connected to the floating plate. The motor and transmission mechanism in the base drive the transmission rack so that the floating plate drives the rearview mirror to adjust within a certain angle range. The transmission mechanism in the prior art is a reduction box matched with a motor. The motor is connected to the input end of the reduction box, and the output end of the reduction box is sleeved with a gear that meshes with the transmission rack. When the motor is started, the output end of the motor drives the gear on the output end of the reduction box to rotate through the reduction box, and the gear drives the transmission rack to move, thereby pushing the floating plate to adjust the angle of the rearview mirror.

[0003] In the related art, a Chinese patent with application number CN202210395904.3 proposes a gear reduction motor with high meshing accuracy, which includes a motor and a reduction box. The front of the reduction box is equipped with a motor, the output end of the motor is connected to a rotating shaft, and the tail end of the rotating shaft extends into the interior of the reduction box. The surface of the rotating shaft is sleeved with a self-test sun gear. The interior of the reduction box can reduce the torque output by the motor through the arrangement of a planetary gear set. Specifically, the motor is started to drive the rotating shaft to rotate, and then the self-test sun gear is driven to rotate. Through the connection between the gear ring and the self-test sun gear and the planetary gear, the planetary gear can be made to rotate while revolving around the self-test sun gear and around the gear ring. While achieving deceleration, the self-test sun gear is limited, thereby ensuring that the self-test sun gear can output torque stably.

[0004] With regard to the above-mentioned related technologies, the output end of the motor is connected to a rotating shaft, the rear end of the rotating shaft extends into the interior of the reduction gearbox and a sun gear is sleeved on the rotating shaft. When the output end of the motor and the rotating shaft are assembled and connected, there is a risk that the output end of the motor and the rotating shaft are not coaxial, causing the rotating shaft to drive the entire reduction gearbox to shake during the process of the motor driving the rotating shaft to rotate, resulting in the output end of the reduction gearbox being unable to achieve smooth drive. Utility Model Content

[0005] In order to improve the problem that the reduction box will shake when the output end of the motor is not coaxial with the rotating shaft, the present application provides a planetary gear reduction box structure for a rearview mirror lens driver.

[0006] The planetary gear reduction box structure of a rearview mirror lens driver provided in the present application adopts the following technical solution:

[0007] A planetary gear reduction box structure for a rearview mirror lens driver, comprising:

[0008] A housing, the housing comprising a reduction box lower cover and a reduction box upper cover, the reduction box upper cover being rotatably buckled at the opening of the reduction box lower cover;

[0009] A planetary gear assembly is located between the lower cover of the reduction box and the upper cover of the reduction box, and the planetary gear assembly includes an input shaft rotatably inserted in the middle of the lower cover of the reduction box, a sun gear fixedly sleeved on the input shaft, a plurality of double-layer planetary gears spaced along the circumference of the sun gear, a first gear ring fixed in the lower cover of the reduction box, a second gear ring fixed in the upper cover of the reduction box, and an output gear fixed in the middle of the outer end surface of the upper cover of the reduction box, the double-layer planetary gear includes a first gear meshing with the first gear ring and the sun gear and a second gear meshing with the second gear ring, and the first gear and the second gear are fixedly connected coaxially;

[0010] A motor is located outside the housing, and an output end of the motor is fixedly connected to the input shaft; and

[0011] The limiting structure is located between the lower cover of the reduction gearbox and the motor, and can limit the shaking of the lower cover of the reduction gearbox relative to the motor.

[0012] Furthermore, the limiting structure includes a boss fixed on the end of the motor and a plurality of limiting plates fixed on the outer end surface of the lower cover of the reduction gearbox. The output end of the motor is rotatably penetrated by the boss, and the plurality of limiting plates are spaced apart along the circumference of the input shaft. A cavity for the boss to be inserted is formed between the plurality of limiting plates. When the output end of the motor is penetrated by the boss and fixedly connected to the input shaft, the boss is inserted into the cavity, and the plurality of limiting plates are respectively abutted against the circumferential side of the boss.

[0013] Furthermore, the boss is arranged in a cylindrical shape coaxially distributed with the motor output end, the limiting plate is arranged in an arc shape, and the inner side wall of the limiting plate is closely matched with the arc side wall of the boss.

[0014] Furthermore, a through hole is formed in the middle of the lower cover of the reduction box, the input shaft passes through the through hole, an anti-collision ring is sleeved on the end of the input shaft, and the anti-collision ring is movably arranged in the through hole.

[0015] Furthermore, the sun gear has 8 teeth, the first gear has 24 teeth, the second gear has 23 teeth, the first gear ring has 55 teeth, and the second gear ring has 54 teeth.

[0016] Furthermore, a first positioning hole is formed through the end surface of the double-layer planetary gear, a second positioning hole is formed on the end surface of the reducer lower cover, and a third positioning hole is formed on the end surface of the reducer upper cover. By adjusting the alignment of the first positioning hole, the second positioning hole and the third positioning hole, multiple double-layer planetary gears can be evenly distributed along the circumference of the input shaft when the reducer upper cover is buckled onto the reducer lower cover.

[0017] Furthermore, a clamping ring is fixedly sleeved at the opening of the gearbox upper cover, and an annular step is provided at the opening of the gearbox lower cover. When the gearbox upper cover is buckled on the opening of the gearbox lower cover, the clamping ring is located on the step, and a convex ring is protruding from the inner side of the step. The inner diameter of the convex ring is smaller than the outer diameter of the clamping ring, and the convex ring can press the clamping ring onto the step.

[0018] Furthermore, the inner side surface of the convex ring is set as an arc surface, and the outer edge of the end surface of the clamping ring away from the reduction box upper cover is set as a slope surface.

[0019] In summary, the present application includes at least one of the following beneficial technical effects:

[0020] 1. A limit structure is provided between the lower cover of the reduction gearbox and the motor to limit the shaking of the lower cover of the reduction gearbox relative to the motor, so as to ensure that when the motor drives the planetary gear assembly to operate, the output wheel can rotate smoothly, thereby stably driving the transmission rack to move and realizing smooth adjustment of the rearview mirror angle;

[0021] 2. Set the number of teeth of the sun gear to 8, the diameter of the sun gear is 3.05 mm, the number of teeth of the first gear is set to 24, the number of teeth of the second gear is set to 23, the number of teeth of the first gear ring is set to 55, and the number of teeth of the second gear ring is set to 54. At this time, the reduction ratio of the planetary gear assembly is 317.25, so that the planetary gear assembly has less noise during operation, and the planetary gear assembly can run more smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0024] Figure 2 It is an exploded view of the motor, the gearbox lower cover, the gearbox upper cover and the double-layer planetary gear in the embodiment of the present application.

[0025] Figure 3It is an exploded view of the reduction gearbox lower cover, reduction gearbox upper cover, input shaft and double-layer planetary gear in the embodiment of the present application.

[0026] Figure 4 It is a schematic diagram of the cross-sectional structure of the reduction gearbox lower cover and the reduction gearbox upper cover in the embodiment of the present application.

[0027] Figure 5 yes Figure 4 Enlarged schematic diagram of part A.

[0028] Figure numerals: 1. gearbox lower cover; 2. gearbox upper cover; 3. input shaft; 4. sun gear; 5. double-layer planetary gear; 51. first gear; 52. second gear; 6. first gear ring; 7. second gear ring; 8. output wheel; 9. motor; 10. boss; 11. limit plate; 12. through hole; 13. anti-collision ring; 14. first positioning hole; 15. second positioning hole; 16. third positioning hole; 17. clamping ring; 18. step platform; 19. convex ring; 20. arc surface; 21. slope surface. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] The present application embodiment discloses a planetary gear reduction box structure of a rearview mirror lens driver. Figure 1 , Figure 2 and Figure 3A planetary gear reduction box structure of a rearview mirror lens driver includes a motor 9, a housing and a planetary gear assembly, wherein the planetary gear assembly is located inside the housing and the motor 9 is located outside the housing. The housing includes a reduction box lower cover 1 and a reduction box upper cover 2, wherein the reduction box upper cover 2 is coaxially rotatably buckled at the opening of the reduction box lower cover 1, and a through hole 12 is provided through the middle of the reduction box lower cover 1. The planetary gear assembly includes an input shaft 3, a sun gear 4, a plurality of double-layer planetary gears 5, a first gear ring 6, a second gear ring 7 and an output wheel 8; one end of the input shaft 3 is fixedly connected to the output end of the motor 9, and the other end is provided with a through hole 12, and the motor 9 can drive the input shaft 3 to rotate in the through hole 12. The sun gear 4 is fixedly sleeved on the input shaft 3, the first gear ring 6 is fixed in the gearbox lower cover 1, the sun gear 4 is located in the middle of the first gear ring 6, and a plurality of double-layer planetary gears 5 are arranged at intervals along the circumference of the sun gear 4, wherein the double-layer planetary gear 5 includes a first gear 51 and a second gear 52 fixedly connected on a coaxial line, the first gear 51 is meshed with the first gear ring 6 and the sun gear 4 at the same time, when the motor 9 drives the sun gear 4 to rotate through the input shaft 3, the sun gear 4 can drive the plurality of double-layer planetary gears 5 to make circular motions around the input shaft 3 in the first gear ring 6. The second gear ring 7 is fixed in the gearbox upper cover 2, when the gearbox upper cover 2 is rotated and buckled on the opening of the gearbox lower cover 1, the second gear 52 is meshed with the second gear ring 7, so that when the plurality of double-layer planetary gears 5 make circular motions around the input shaft 3 in the first gear ring 6, the second gear 52 can drive the gearbox upper cover 2 to rotate on the gearbox lower cover 1 through the second gear ring 7. The output wheel 8 is fixed at the middle of the outer end surface of the reduction box upper cover 2. The reduction box upper cover 2 can drive the output wheel 8 to rotate, so that the output wheel 8 can drive the transmission rack to move, and then push the floating plate to adjust the angle of the rearview mirror.

[0031] Since the motor 9 is assembled and connected to the input shaft 3, if there is a misalignment problem after the output end of the motor 9 is connected to the input shaft 3, the housing will shake when the motor 9 drives the planetary gear assembly to operate, causing the output wheel 8 to be unable to stably drive the transmission rack to move, thereby making it impossible to smoothly adjust the angle of the rearview mirror. For this reason, refer to Figure 1 , Figure 2 and Figure 3A limiting structure capable of limiting the shaking of the reducer lower cover 1 relative to the motor 9 is provided between the reducer lower cover 1 and the motor 9. The limiting structure includes a boss 10 fixed at the end of the motor 9 and a plurality of limiting plates 11 fixed on the outer end surface of the reducer lower cover 1. The boss 10 is arranged in a cylindrical shape. The output end of the motor 9 is provided with the boss 10, and the output end of the motor 9 is arranged coaxially with the boss 10. The output end of the motor 9 can rotate in the boss 10. The plurality of limiting plates 11 are distributed at intervals along the circumference of the input shaft 3, and a cavity for the boss 10 to be inserted is formed between the plurality of limiting plates 11. When the output end of the motor 9 is provided with the boss 10 and is fixedly connected to the input shaft 3, the boss 10 is inserted into the cavity, and the plurality of limiting plates 11 are respectively abutted against the circumferential side of the boss 10. Under the joint limitation of the plurality of limiting plates 11 and the boss 10, even if the output end of the motor 9 is not aligned with the input shaft 3, the housing will not shake relative to the motor 9 during the process of the motor 9 driving the planetary gear assembly to operate, ensuring that the output wheel 8 on the housing can stably drive the transmission gear to move. At the same time, the boss 10 is coaxially arranged with the output end of the motor 9, and the plurality of limiting plates 11 are distributed at intervals along the circumference of the input shaft 3, so that in the process of connecting the output end of the motor 9 with the input shaft 3, the limiting effect between the boss 10 and the plurality of limiting plates 11 can reduce the degree of deflection between the output end of the motor 9 and the input shaft 3 to a certain extent, ensuring that the motor 9 can drive the output wheel 8 to rotate smoothly through the input shaft 3.

[0032] Since the boss 10 is set in a cylindrical shape, in order to make the limiting plates 11 evenly stressed when the limiting plates 11 abut against the peripheral side of the boss 10, Figure 3 The limiting plate 11 is configured to be arc-shaped, and the inner side wall of the limiting plate 11 fits snugly with the arc side wall of the boss 10 , so that the boss 10 can be stably clamped in the cavity between the plurality of limiting plates 11 .

[0033] Considering the existence of machining errors, under the joint action of the boss 10 and the plurality of limit plates 11, the output end of the motor 9 is still slightly deviated from the input shaft 3, so that when the motor 9 drives the input shaft 3 to rotate, the input shaft 3 slightly shakes, causing the input shaft 3 to collide with the lower cover 1 of the reduction box. For this reason, referring to Figure 2 and Figure 3 , the aperture of the through hole 12 on the gearbox lower cover 1 is larger than the diameter of the input shaft 3. At the same time, the end of the input shaft 3 is sleeved with an anti-collision collar 13, which is made of rubber material and is movably arranged in the through hole 12. Under the action of the anti-collision collar 13, the motor 9 can smoothly drive the input shaft 3 to rotate in the through hole 12 of the gearbox lower cover 1, and the anti-collision collar 13 can alleviate the collision between the input shaft 3 and the inner wall of the through hole 12 caused by shaking during the rotation process, reduce noise, and also extend the service life of the input shaft 3 and the gearbox lower cover 1.

[0034] Since the motor 9 needs to consider the smoothness and noise of the planetary gear assembly when driving the planetary gear assembly to operate, three groups of test data were selected after multiple experiments and tests. In the first group, the number of teeth of the sun gear 4 is set to 6 teeth, the diameter of the sun gear 4 is 2.3 mm, the number of teeth of the first gear 51 is set to 21 teeth, the number of teeth of the second gear 52 is set to 20 teeth, the number of teeth of the first gear ring 6 is set to 48 teeth, and the number of teeth of the second gear ring 7 is set to 47 teeth. At this time, the reduction ratio of the planetary gear assembly is 329. After the test, it was found that the noise generated by this group of planetary gear assemblies during operation was 42dB, and the time required for the output wheel 8 to rotate one circle was 4.8s. In the second group, the number of teeth of the sun gear 4 is set to 7 teeth, the diameter of the sun gear 4 is 2.7 mm, the number of teeth of the first gear 51 is set to 23 teeth, the number of teeth of the second gear 52 is set to 22 teeth, the number of teeth of the first gear ring 6 is set to 53 teeth, and the number of teeth of the second gear ring 7 is set to 52 teeth. At this time, the reduction ratio of the planetary gear assembly is 341.7. After testing, it was found that the noise generated by this group of planetary gear assemblies during operation was 45dB, and the time required for the output wheel 8 to rotate one circle was 6.5s. In the third group, the number of teeth of the sun gear 4 is set to 8, the diameter of the sun gear 4 is 3.05 mm, the number of teeth of the first gear 51 is set to 24, the number of teeth of the second gear 52 is set to 23, the number of teeth of the first gear ring 6 is set to 55, and the number of teeth of the second gear ring 7 is set to 54. At this time, the reduction ratio of the planetary gear assembly is 317.25. After testing, it was found that the noise generated by this group of planetary gear assemblies during operation is 39 dB, and the time required for the output wheel 8 to rotate one circle is 4.2 seconds. For this reason, in the embodiment of the present application, the planetary gear assembly is designed using the parameters of the third group.

[0035] The sun gear 4 drives the multiple double-layer planetary gears 5 to make circular motions around the input shaft 3 in the first gear ring 6. In order to avoid the problem that the multiple double-layer planetary gears 5 are stuck after rotating for a period of time, the angle between two adjacent double-layer planetary gears 5 needs to be adjusted according to the design requirements during the assembly process. Figure 2 and Figure 3 A first positioning hole 14 is formed on the end surface of the double-layer planetary gear 5, a second positioning hole 15 is formed on the end surface of the reduction gearbox lower cover 1, a plurality of second positioning holes 15 are provided, and the plurality of second positioning holes 15 correspond one-to-one to the plurality of double-layer planetary gears 5, and the plurality of second positioning holes 15 are evenly distributed along the circumference of the through hole 12, a third positioning hole 16 is formed on the end surface of the reduction gearbox upper cover 2, and correspondingly, a plurality of third positioning holes 16 are also provided, and the plurality of third positioning holes 16 correspond one-to-one to the plurality of double-layer planetary gears 5, and the plurality of third positioning holes 16 are evenly distributed along the circumference of the output wheel 8.

[0036] During assembly, first align the first positioning holes 14 on the multiple double-layer planetary gears 5 with the multiple second positioning holes 15 on the gearbox lower cover 1, and then mesh the double-layer planetary gears 5 between the first gear ring 6 and the sun gear 4. At this time, the multiple double-layer planetary gears 5 are evenly distributed and installed along the circumference of the sun gear 4; then align the multiple third positioning holes 16 on the gearbox upper cover 2 with the first positioning holes 14 on the multiple double-layer planetary gears 5 one by one, and buckle the gearbox upper cover 2 on the gearbox lower cover 1. At this time, the second gear ring 7 on the gearbox upper cover 2 is smoothly meshed and assembled with the double-layer planetary gears 5. This assembly method can prevent the multiple double-layer planetary gears 5 from being stuck after a long period of operation, ensuring the smooth and stable operation of the planetary gear assembly.

[0037] To ensure that the upper cover 2 of the gearbox can be smoothly rotated and fastened on the lower cover 1 of the gearbox, refer to Figure 4 and Figure 5 The upper cover 2 and the lower cover 1 of the gearbox are both made of plastic material and have a certain degree of deformation ability. A clamping ring 17 is fixedly sleeved at the opening of the upper cover 2 of the gearbox, and the clamping ring 17 is integrally formed with the upper cover 2 of the gearbox; an annular step platform 18 is provided at the opening of the lower cover 1 of the gearbox, and the step platform 18 can support the upper cover 2 of the gearbox. When the upper cover 2 of the gearbox is buckled on the opening of the lower cover 1 of the gearbox, the clamping ring 17 is located on the step platform 18. In order to enable the reduction box upper cover 2 to be stably rotated and buckled on the reduction box lower cover 1, a convex ring 19 is protruded on the inner side of the step platform 18 on the reduction box lower cover 1. The convex ring 19 is integrally formed with the reduction box lower cover 1, and the convex ring 19 and the reduction box lower cover 1 are coaxially arranged; the inner diameter of the convex ring 19 is smaller than the outer diameter of the clamping ring 17. When the clamping ring 17 on the reduction box upper cover 2 is located on the step platform 18 on the reduction box lower cover 1, the convex ring 19 is located on the side of the clamping ring 17 away from the reduction box lower cover 1, and the convex ring 19 acts on one side surface of the clamping ring 17 so that the clamping ring 17 can be pressed on the step platform 18, thereby achieving stable buckling of the reduction box upper cover 2 and the reduction box lower cover 1.

[0038] In order to facilitate the buckling of the reduction box upper cover 2 on the reduction box lower cover 1, refer to Figure 5 The inner side surface of the convex ring 19 is set as an arc surface 20, and the outer edge of the end surface of the clamping ring 17 away from the reduction box upper cover 2 is set as a slope surface 21. When the reduction box upper cover 2 is pushed toward the reduction box lower cover 1, the slope surface 21 on the clamping ring 17 first contacts the arc surface 20 of the convex ring 19. As the pressing continues, the open end of the reduction box lower cover 1 is slightly deformed, so that the clamping ring 17 passes through the convex ring 19 smoothly and enters the step platform 18. At this time, the clamping ring 17 is pressed against the step platform 18 by the convex ring 19.

[0039] The implementation principle of the planetary gear reduction box structure of a rearview mirror lens driver in an embodiment of the present application is as follows: first assemble the planetary gear assembly. During assembly, first install the input shaft 3 with the sun gear 4 on the lower cover of the reduction box, then align the first positioning holes 14 on the multiple double-layer planetary gears 5 with the multiple second positioning holes 15 on the lower cover 1 of the reduction box, and then mesh the double-layer planetary gears 5 between the first gear ring 6 and the sun gear 4. At this time, the multiple double-layer planetary gears 5 are evenly distributed and installed along the circumference of the sun gear 4; then align the multiple third positioning holes 16 on the reduction box upper cover 2 with the first positioning holes 14 on the multiple double-layer planetary gears 5 one by one, and buckle the reduction box upper cover 2 on the reduction box lower cover 1 to complete the assembly of the planetary gear assembly.

[0040] Then connect the motor 9 to the planetary gear assembly. At this time, first insert the boss 10 into the cavity between the multiple limit plates 11, so that the multiple limit plates 11 are tightly pressed against the peripheral wall of the boss 10, and finally fix the output end of the motor 9 to the input shaft 3 in the planetary gear assembly to complete the assembly of the motor 9 and the planetary gear assembly.

[0041] During operation, the motor 9 drives the sun gear 4 to rotate via the input shaft 3, and the sun gear 4 can drive multiple double-layer planetary gears 5 to make circular motion around the input shaft 3 in the first gear ring 6. At the same time, the second gear 52 on the double-layer planetary gear 5 can drive the reduction box upper cover 2 to rotate on the reduction box lower cover 1 through the second gear ring 7, so that the reduction box upper cover 2 can drive the output wheel 8 to rotate, so that the output wheel 8 can drive the transmission rack to move, and then push the floating plate to adjust the angle of the rearview mirror.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A planetary gear reduction box structure for a rearview mirror lens driver, characterized in that: include A housing, the housing comprising a reduction box lower cover and a reduction box upper cover, the reduction box upper cover being rotatably buckled at the opening of the reduction box lower cover; A planetary gear assembly is located between the lower cover of the reduction box and the upper cover of the reduction box, and the planetary gear assembly includes an input shaft rotatably inserted in the middle of the lower cover of the reduction box, a sun gear fixedly sleeved on the input shaft, a plurality of double-layer planetary gears spaced along the circumference of the sun gear, a first gear ring fixed in the lower cover of the reduction box, a second gear ring fixed in the upper cover of the reduction box, and an output gear fixed in the middle of the outer end surface of the upper cover of the reduction box, the double-layer planetary gear includes a first gear meshing with the first gear ring and the sun gear and a second gear meshing with the second gear ring, and the first gear and the second gear are fixedly connected coaxially; The motor is located outside the housing, and the output end of the motor is fixedly connected to the input shaft; as well as The limiting structure is located between the lower cover of the reduction gearbox and the motor, and can limit the shaking of the lower cover of the reduction gearbox relative to the motor.

2. The planetary gear reduction box structure of the rearview mirror lens driver according to claim 1, characterized in that: The limiting structure includes a boss fixed on the end of the motor and a plurality of limiting plates fixed on the outer end surface of the lower cover of the reduction box. The output end of the motor is rotatably penetrated by the boss, and the plurality of limiting plates are spaced apart along the circumference of the input shaft. A cavity for the boss to be inserted is formed between the plurality of limiting plates. When the output end of the motor is penetrated by the boss and fixedly connected to the input shaft, the boss is inserted into the cavity, and the plurality of limiting plates are respectively abutted against the circumferential side of the boss.

3. The planetary gear reduction box structure of the rearview mirror lens driver according to claim 2, characterized in that: The boss is arranged in a cylindrical shape coaxially with the motor output end, the limiting plate is arranged in an arc shape, and the inner side wall of the limiting plate is closely matched with the arc side wall of the boss.

4. The planetary gear reduction box structure of a rearview mirror lens driver according to claim 1, characterized in that: A through hole is formed in the middle of the lower cover of the reduction box, the input shaft passes through the through hole, an anti-collision collar is sleeved on the end of the input shaft, and the anti-collision collar is movably arranged in the through hole.

5. The planetary gear reduction box structure of a rearview mirror lens driver according to claim 1, characterized in that: The number of teeth of the sun gear is 8, the number of teeth of the first gear is 24, the number of teeth of the second gear is 23, the number of teeth of the first gear ring is 55, and the number of teeth of the second gear ring is 54.

6. The planetary gear reduction box structure of a rearview mirror lens driver according to claim 1, characterized in that: A first positioning hole is formed through the end surface of the double-layer planetary gear, a second positioning hole is formed on the end surface of the reduction box lower cover, and a third positioning hole is formed on the end surface of the reduction box upper cover. By adjusting the alignment of the first positioning hole, the second positioning hole and the third positioning hole, multiple double-layer planetary gears can be evenly distributed along the circumference of the input shaft when the reduction box upper cover is buckled onto the reduction box lower cover.

7. The planetary gear reduction box structure of a rearview mirror lens driver according to claim 1, characterized in that: A clamping ring is fixedly sleeved at the opening of the upper cover of the reduction box, and an annular step platform is arranged at the opening of the lower cover of the reduction box. When the upper cover of the reduction box is buckled on the opening of the lower cover of the reduction box, the clamping ring is located on the step platform, and a convex ring is protruding from the inner side of the step platform. The inner diameter of the convex ring is smaller than the outer diameter of the clamping ring, and the convex ring can press the clamping ring onto the step platform.

8. The planetary gear reduction box structure of the rearview mirror lens driver according to claim 7, characterized in that: The inner side surface of the convex ring is set as an arc surface, and the outer edge of the end surface of the clamping ring away from the reduction box upper cover is set as a slope surface.

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