Speed reducer and speed reduction motor

Abstract

The application discloses a speed reduction box and a speed reduction motor. The speed reduction box comprises a plurality of planetary speed reduction mechanisms, the plurality of planetary speed reduction mechanisms are connected in series, input ends of the plurality of planetary speed reduction mechanisms are used for being connected with output ends of the motor, output ends of the plurality of planetary speed reduction mechanisms are used for driving external loads, and a plurality of shims are arranged between any adjacent two planetary speed reduction mechanisms in the plurality of planetary speed reduction mechanisms. In this way, the speed reduction box has the advantages of low noise, high consistency and low maintenance cost.

Description

Technical Field

[0001] This application relates to the field of automotive parts, and in particular to a gearbox and a geared motor. Background Technology

[0002] Geared motors with multi-stage planetary gear reducers are widely used in electric pedals due to their high reduction ratio and ease of layout. However, existing multi-stage planetary gear reducers suffer from problems such as high noise, poor consistency, and high maintenance costs. Utility Model Content

[0003] The present application provides a gearbox and a geared motor that can solve the problems of high noise, poor consistency and high maintenance cost of multi-stage planetary gearboxes in the prior art.

[0004] To solve the above-mentioned technical problems, one technical solution adopted in this application is: to provide a gearbox. A gearbox includes: a plurality of planetary reduction mechanisms, wherein the plurality of planetary reduction mechanisms are connected in series, the input end of the plurality of planetary reduction mechanisms is used to connect to the output end of a motor, and the output end of the plurality of planetary reduction mechanisms is used to drive an external load; a plurality of shims are provided between any two adjacent planetary reduction mechanisms.

[0005] In some embodiments, the number of shims between any two adjacent planetary reduction mechanisms is equal to the sum of the number of sun gears and planet gears in each planetary reduction mechanism.

[0006] In some embodiments, the plurality of planetary reduction mechanisms include: a first planetary reduction mechanism, including a sun gear integrated shaft and a plurality of first planetary gears, wherein the gear portion of the sun gear integrated shaft is located at the middle of the plurality of first planetary gears and meshes with the plurality of first planetary gears, and the plurality of first planetary gears are located within a first gear ring and mesh with the first gear ring; a second planetary reduction mechanism, including a first sun gear integrated carrier and a plurality of second planetary gears, wherein the carrier portion of the first sun gear integrated carrier is drively connected to the plurality of first planetary gears, the gear portion of the first sun gear integrated carrier is located at the middle of the plurality of second planetary gears and meshes with the plurality of second planetary gears, and the plurality of second planetary gears are located within a second gear ring and mesh with the second gear ring; and a third planetary reduction mechanism, including a second sun gear integrated carrier, an output shaft integrated carrier, and a plurality of third planetary gears. The frame portion of the second sun gear integrated frame is connected to the plurality of second planetary gears via a transmission. The gear portion of the second sun gear integrated frame is located in the middle of the plurality of third planetary gears and meshes with the plurality of third planetary gears. The frame portion of the output shaft integrated frame is connected to the plurality of third planetary gears via a transmission. The plurality of third planetary gears are located within the second gear ring and mesh with the second gear ring. A gasket is provided between the sun gear integrated shaft and the first sun gear integrated frame, between the first sun gear integrated frame and the second sun gear integrated frame, and between the second sun gear integrated frame and the output shaft integrated frame. A plurality of gaskets are provided between the plurality of first planetary gears and the first sun gear integrated frame, between the plurality of second planetary gears and the second sun gear integrated frame, and between the plurality of third planetary gears and the output shaft integrated frame.

[0007] In some embodiments, the gearbox further includes a first gear ring and a second gear ring, the plurality of first planetary gears are located within the first gear ring and mesh with the first gear ring, the plurality of second planetary gears are located within the second gear ring and mesh with the second gear ring, and the plurality of third planetary gears are located within the second gear ring and mesh with the second gear ring; the gear portion of the sun gear integrated shaft, the first planetary gears and the first gear ring are all helical gears, and the gear portion of the first sun gear integrated frame, the second planetary gears, the gear portion of the second sun gear integrated frame, the third planetary gears and the second gear ring are all spur gears.

[0008] In some embodiments, the gearbox further includes a housing, the first gear ring and the second gear ring are fitted together, the first gear ring and the second gear ring are both housed in the housing, the inner wall of the housing is provided with a plurality of limiting grooves, and the first gear ring and the second gear ring are limited to the housing through the plurality of limiting grooves.

[0009] In some embodiments, the gearbox further includes a self-locking mechanism, the input end of which is connected to the output end of the motor, and the output end of which is drively connected to the input end of the plurality of planetary reduction mechanisms.

[0010] In some embodiments, the gasket is a stainless steel gasket.

[0011] In some embodiments, the gearbox further includes a central shaft that passes through the sun gear integrated shaft, the first sun gear integrated frame, the second sun gear integrated frame, and the output shaft integrated frame.

[0012] In some embodiments, the central axis is a soft central axis.

[0013] Another technical solution adopted in this application is: providing a geared motor, including a motor and a gearbox, wherein the motor is fixed to the gearbox along the length direction of the gearbox; wherein the gearbox is any of the gearboxes described above.

[0014] The beneficial effects of this application are as follows: Unlike existing technologies, the gearbox provided in this application includes: a plurality of planetary reduction mechanisms, which are connected in series for transmission. The input ends of the planetary reduction mechanisms are used to connect to the output ends of a motor, and the output ends of the planetary reduction mechanisms are used to drive an external load. A plurality of shims are provided between any two adjacent planetary reduction mechanisms. In the technical solution of this application, by providing a plurality of shims between any two adjacent planetary reduction mechanisms, the axial clearance between the planetary reduction mechanisms is compensated, preventing axial movement of the planetary reduction mechanisms and thus avoiding noise. Furthermore, the shims can adjust the meshing depth between the planetary gears and the sun gear or internal gear ring in the planetary reduction mechanism, thereby ensuring the consistency of the meshing depth between gears. Simultaneously, the shims can also prevent direct contact between two adjacent planetary reduction mechanisms and reduce wear caused by rotation, thereby extending the service life of the planetary reduction mechanisms and reducing maintenance costs. In this way, the gearbox has the advantages of low noise, high consistency, and low maintenance costs. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 These are schematic diagrams of the vehicle structure provided in some embodiments of this application; Figure 2 This is a schematic diagram of the structure of an electric pedal provided in some embodiments of this application; Figure 3 These are schematic diagrams of the geared motor provided in some embodiments of this application; Figure 4 This is an exploded view of the motor provided in some embodiments of this application; Figure 5 This is a cross-sectional view of a geared motor provided in some embodiments of this application; Figure 6 This is an exploded view of a gearbox provided in some embodiments of this application; Figure 7 This is a schematic diagram of the self-locking mechanism provided in some embodiments of this application from one perspective; Figure 8 This is a schematic diagram of the self-locking mechanism provided in some embodiments of this application from another perspective; Figure 9 This is a schematic diagram of the structure of a self-locking mechanism provided in some other embodiments of this application; Figure 10 These are schematic diagrams of the structure of the box provided in some embodiments of this application; Figure 11 This is a schematic diagram of the end cap structure provided in some embodiments of this application.

[0017] Explanation of reference numerals in the attached drawings: 1000 - Gearbox, 100 - Self-locking mechanism, 111 - First pawl, 1111 - Second protruding structure, 112 - Second pawl, 1121 - Third protruding structure, 113 - Roller, 114 - Cage, 1141 - First protruding structure, 115 - Friction ring, 120 - One-way self-locking mechanism, 121 - Wedge block, 122 - Friction ring, 200 - Planetary reduction mechanism, 210 - First planetary reduction mechanism, 211 - Sun gear integrated shaft, 212 - First planetary gear, 220 - Second planetary reduction mechanism, 221 - First sun gear integrated frame, 222 - Second planetary gear, 230 - Third planetary reduction mechanism, 231- Second sun gear integrated frame, 232- Output shaft integrated frame, 233- Third planetary gear, 240- Shim, 300- First gear ring, 310- Limiting protrusion, 400- Second gear ring, 500- Housing, 510- Limiting groove, 600- Central shaft, 700- Sliding bearing, 800- Rolling bearing, 900- End cover, 910- First fixing hole, 920- Second fixing hole, 930- Third fixing hole, L- Side length, 2000- Motor, 2100- Housing, 2200- Magnet, 3000- Gear motor, 4000- Electric pedal, 10000- Vehicle. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It is understood that the specific embodiments described herein are only for explaining this application and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this application are shown in the accompanying drawings, not all structures. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0019] The terms "first," "second," and "third" in this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationships and movements between components in a specific orientation (as shown in the figures). If the specific orientation changes, the directional indications also change accordingly. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0020] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0021] The gearbox provided in this application includes: a plurality of planetary reduction mechanisms, which are connected in series for transmission. The input ends of the planetary reduction mechanisms are used to connect to the output ends of a motor, and the output ends of the planetary reduction mechanisms are used to drive an external load. A plurality of shims are provided between any two adjacent planetary reduction mechanisms. In the technical solution of this application, by providing a plurality of shims between any two adjacent planetary reduction mechanisms, the axial clearance between the planetary reduction mechanisms is compensated, preventing axial movement of the planetary reduction mechanisms and the generation of noise. Furthermore, the shims can adjust the meshing depth between the planetary gears and the sun gear or internal gear ring in the planetary reduction mechanism, thereby ensuring the consistency of the meshing depth between the gears. Simultaneously, the shims can also prevent direct contact between two adjacent planetary reduction mechanisms and reduce wear caused by rotation, thereby extending the service life of the planetary reduction mechanisms and reducing maintenance costs. In this way, the gearbox has the advantages of low noise, high consistency, and low maintenance costs.

[0022] Please see Figure 1 , Figure 1 This is a structural schematic diagram of a vehicle provided in some embodiments of this application. The vehicle 10000 provided in this application may include, but is not limited to, an electric running board 4000. The electric running board 4000 can automatically extend to assist occupants in conveniently entering and exiting the vehicle cabin, and automatically retract to ensure the passability and aesthetic appearance of the vehicle 10000. In some embodiments, opening the door of the vehicle 10000 can trigger the electric running board 4000 to automatically extend, and closing the door of the vehicle 10000 can trigger the electric running board 4000 to automatically retract. Compared with the prior art, the electric running board 4000 has good layout performance, which is beneficial for its arrangement in the chassis of the vehicle 10000. When the electric running board 4000 is in the retracted position, the vehicle 10000 still has a large ground clearance, thereby ensuring the passability and off-road performance of the vehicle 10000.

[0023] Please see Figure 2 , Figure 2This is a schematic diagram of the structure of an electric pedal provided in some embodiments of this application. The electric pedal 4000 provided in this application may include, but is not limited to, a geared motor 3000. Driven by the geared motor 3000, the electric pedal 4000 can automatically extend and retract relative to the vehicle body 10000. Compared with the prior art, the geared motor 3000, while ensuring sufficient output torque and output power, has the advantages of high transmission efficiency, compact structure, and small size, which is beneficial for its placement on the chassis of the vehicle 10000. Therefore, the electric pedal 4000 equipped with the geared motor 3000 is conveniently placed on the chassis of the vehicle 10000. Due to the advantages of the compact structure and small size of the geared motor 3000, when the electric pedal 4000 is in the retracted position, the vehicle 10000 still has a large ground clearance, thereby ensuring the passability and off-road performance of the vehicle 10000.

[0024] Please see Figure 3 , Figure 3 This is a schematic diagram of the structure of a geared motor provided in some embodiments of this application. The geared motor 3000 provided in this application may include, but is not limited to, a gearbox 1000 and a motor 2000. The motor 2000 is fixed to the gearbox 1000 along its length. The high-speed, low-torque output of the motor 2000 is reduced and amplified by the gearbox 1000 to output low-speed, high-torque output, driving the electric pedal 4000 to smoothly extend and retract. Compared to the prior art, the geared motor 3000 still possesses self-locking performance without sacrificing transmission efficiency, enabling the electric pedal 4000 to self-lock in the extended and / or retracted positions to ensure safe use. In this embodiment, the electric pedal 4000 will not accidentally extend due to its own weight or other external forces when in the retracted position. In other embodiments, the electric pedal 4000 will not accidentally retract due to foot pressure or other external forces when in the extended position.

[0025] Please see Figure 4 , Figure 4 This is an exploded view of a motor provided in some embodiments of this application. The motor 2000 provided in this application may include, but is not limited to, a housing 2100 and magnets 2200. Magnets 2200 are fixed to the inner wall of the housing 2100. In this embodiment, there are four magnets 2200, all of which are fixed to the inner wall of the housing 2100, providing a stable magnetomotive force source for the motor 2000. In this way, the structure of the motor 2000 can be simplified, the volume of the motor 2000 can be reduced, and the motor 2000 can be easily arranged in the confined space of the vehicle chassis 10000. The housing 2100 is fixed to the gearbox 1000 to connect the motor 2000 to the gearbox 1000.

[0026] Please refer to the following: Figures 5-9 , Figure 5This is a cross-sectional view of a geared motor provided in some embodiments of this application. Figure 6 This is an exploded view of a gearbox provided in some embodiments of this application. Figure 7 This is a schematic diagram of the self-locking mechanism provided in some embodiments of this application from one perspective. Figure 8 This is a schematic diagram of the self-locking mechanism provided in some embodiments of this application from another perspective. Figure 9 This is a schematic diagram of the self-locking mechanism provided in other embodiments of this application. The gearbox 1000 provided in this application may include, but is not limited to, a self-locking mechanism 100, a plurality of planetary reduction mechanisms 200, a housing 500, a sliding bearing 700, and a rolling bearing 800. The sliding bearing 700, the self-locking mechanism 100, the rolling bearing 800, and the plurality of planetary reduction mechanisms 200 are all housed in the housing 500. The sliding bearing 700 is located between the motor 2000 and the self-locking mechanism 100. The input end of the self-locking mechanism 100 is used to connect to the output end of the motor 2000. Specifically, the output shaft of the motor 2000 passes through the sliding bearing 700 and is drively connected to the self-locking mechanism 100. The input ends of the plurality of planetary reduction mechanisms 200 are connected to the output ends of the self-locking mechanism 100. The output ends of the plurality of planetary reduction mechanisms 200 are used to drive an external load. The plurality of planetary reduction mechanisms 200 are connected in series to form a multi-stage reduction, thereby obtaining a large reduction ratio. The forward and reverse torques output by the motor 2000 can be input to several planetary reduction mechanisms 200 through the self-locking mechanism 100, but the forward and / or reverse torques input by the external load through the several planetary reduction mechanisms 200 cannot be transmitted to the motor 2000 through the self-locking mechanism 100.

[0027] Understandably, placing the self-locking mechanism 100 between the motor 2000 and several planetary reduction mechanisms 200 allows for faster reverse input speeds of the self-locking mechanism 100, thus making its self-locking performance more reliable. Simultaneously, the self-locking mechanism 100 can act as a coupling, providing centering compensation, and eliminating the need for an additional coupling reduces the axial dimension of the gearbox 1000. Furthermore, connecting several planetary reduction mechanisms 200 in series ensures high transmission efficiency and a small size for the gearbox 1000 while maintaining the required high output torque. Therefore, the geared motor 3000 using the gearbox 1000 offers advantages such as reliable self-locking, small size, compact structure, high transmission efficiency, and ease of installation.

[0028] When the self-locking mechanism 100 is a bidirectional self-locking mechanism, the positive torque and reverse torque input by the external load through several planetary reduction mechanisms 200 cannot be transmitted to the motor 2000 through the self-locking mechanism 100.

[0029] When the self-locking mechanism 100 is a one-way self-locking mechanism, the positive or negative torque input by the external load through several planetary reduction mechanisms 200 cannot be transmitted to the motor 2000 through the self-locking mechanism 100.

[0030] Specifically, when the external load is the foot pedal of the electric pedal 4000 and the self-locking mechanism 100 is a bidirectional self-locking mechanism, the geared motor 3000 can drive the foot pedal in the electric pedal 4000 to extend or retract relative to the vehicle 10000; however, when the electric pedal 4000 is in the extended position, the torque generated by the stepping load acting on the foot pedal in the electric pedal 4000 cannot be transmitted in reverse to the motor 2000 in the geared motor 3000, so as to avoid the foot pedal from retracting unexpectedly and causing a safety accident; when the electric pedal 4000 is in the retracted position, the torque generated by the inertial load of the foot pedal in the electric pedal 4000 cannot be transmitted in reverse to the motor 2000 in the geared motor 3000, so as to avoid the foot pedal from extending unexpectedly and causing a safety accident. When the external load is the foot pedal of the electric pedal 4000 and the self-locking mechanism 100 is a one-way self-locking mechanism, the geared motor 3000 can drive the foot pedal in the electric pedal 4000 to extend or retract relative to the vehicle 10000; however, when the electric pedal 4000 is in the retracted position, the torque generated by the inertial load of the foot pedal in the electric pedal 4000 cannot be transmitted in reverse to the motor 2000 in the geared motor 3000, so as to avoid the foot pedal accidentally extending and causing a safety accident; when the electric pedal 4000 is in the extended position, the stepping load acting on the foot pedal in the electric pedal 4000 will cause the foot pedal to have an outward movement tendency, thereby keeping the foot pedal in the extended state.

[0031] In this embodiment, the self-locking mechanism 100 is a bidirectional self-locking mechanism. The self-locking mechanism 100 may include, but is not limited to, a first pawl 111, a second pawl 112, a plurality of rollers 113, a cage 114, and a friction ring 115. The first pawl 111 is used to connect to the output end of the motor 2000. The second pawl 112 is connected to the input ends of a plurality of planetary reduction mechanisms 200. The cage 114 has a plurality of first protrusions 1141 facing inward. The first pawl 111 has a plurality of second protrusions 1111. The second pawl 112 has a plurality of third protrusions 1121. The plurality of second protrusions 1111 are offset from the plurality of first protrusions 1141. Furthermore, the plurality of second protrusions 1111 are offset from the plurality of third protrusions 1121. Along the radial direction of the friction ring 115, the first protrusions 1141 and the third protrusions 1121 are spaced apart and opposite each other. In this way, driven by the motor 2000, the second protrusion structure 1111 can abut against the first protrusion structure 1141 and the third protrusion structure 1121, thereby driving the cage 114 and the second pawl 112 to rotate forward or in reverse, so as to drive several planetary reduction mechanisms 200 in the forward or reverse direction.

[0032] Specifically, when the motor 2000 rotates forward or reverse, the first pawl 111 rotates synchronously with the motor 2000, causing the second protruding structure 1111 to abut against the first protruding structure 1141 of the cage 114 and the third protruding structure 1121 of the second pawl 112, thereby driving the cage 114 and the second pawl 112 to rotate in the same direction. The forward or reverse torque output by the motor 2000 is output through the second pawl 112 to a plurality of planetary reduction mechanisms 200 in series transmission, ultimately driving the foot pedal in the electric pedal 4000 to extend or retract relative to the vehicle 10000.

[0033] Furthermore, the friction ring 115 is sleeved on the retainer 114. A plurality of first protrusions 1141 are arranged around the friction ring 115. A roller 113 is held within the first protrusions 1141. A portion of the peripheral wall of the roller 113 is disposed between the first protrusions 1141 and the third protrusion 1121. In this manner, when the second pawl 112 rotates in either the forward or reverse direction, the third protrusion 1121 can abut against the peripheral wall of the roller 113, causing the roller 113 to press tightly against the inner wall of the friction ring 115, thereby preventing the second pawl 112 from driving the first pawl 111, thus achieving self-locking.

[0034] Specifically, the side of the third protrusion 1121 facing the roller 113 is a plane, and the distance between this plane and the friction ring 115 gradually decreases from its center to both sides. The maximum distance between this plane and the friction ring 115 is not less than the diameter of the roller 113, and the minimum distance between this plane and the friction ring 115 is less than the diameter of the roller 113. When the torque input from the planetary reduction mechanism 200 in the opposite direction causes the second pawl 112 to rotate, the roller 113 can be regarded as moving towards the minimum distance and locking between the friction ring 115 and the third protrusion 1121.

[0035] In some other embodiments, the self-locking mechanism 100 can be a one-way self-locking mechanism. The one-way self-locking mechanism can be one of a wedge-type self-locking mechanism, a ratchet-pawl-type self-locking mechanism, a ball-type self-locking mechanism, a roller-type self-locking mechanism, and a coil spring-type self-locking mechanism. Taking a wedge-type self-locking mechanism as an example, the self-locking mechanism 100 may include, but is not limited to, a wedge block 121 and a friction ring 122. The gap between the side of the wedge block 121 facing the friction ring 122 and the friction ring 122 gradually decreases from one end to the other. The distance from the center of the wedge block 121 to its farthest end is not less than the distance from the center of the wedge block 121 to the friction ring 122, and the distance from the center of the wedge block 121 to its nearest end is less than the distance from the center of the wedge block 121 to the friction ring 122, so that when the wedge block 121 rotates towards the maximum gap, it will abut against the friction ring 122, and when it rotates towards the minimum gap, it will not contact the friction ring 122, thereby achieving one-way self-locking.

[0036] Please refer to the following: Figures 5-10 , Figure 10 This is a schematic diagram of the housing structure provided in some embodiments of this application. The gearbox 1000 also includes a first gear ring 300 and a second gear ring 400. Both the first gear ring 300 and the second gear ring 400 are accommodated in the housing 500. The inner wall of the housing 500 is provided with a limiting groove 510. The first gear ring 300 and the second gear ring 400 are limitedly connected to the housing 500 through a plurality of limiting grooves 510. Specifically, the first gear ring 300 and the second gear ring 400 are provided with limiting protrusions 310 that match the limiting grooves 510. The limiting protrusions 310 are engaged with the limiting grooves 510, so that the first gear ring 300 and the second gear ring 400 cannot rotate relative to the housing 500. Furthermore, the first gear ring 300 and the second gear ring 400 are fitted together to facilitate disassembly and assembly.

[0037] The planetary reduction mechanisms 200 may include, but are not limited to, a first planetary reduction mechanism 210, a second planetary reduction mechanism 220, and a third planetary reduction mechanism 230. Along the length of the reduction gearbox 1000, the second planetary reduction mechanism 220 is located between the first planetary reduction mechanism 210 and the third planetary reduction mechanism 230. The input end of the first planetary reduction mechanism 210 is connected to the output end of the self-locking mechanism 100, allowing the torque output by the motor 2000 to be transmitted to the first planetary reduction mechanism 210 via the self-locking mechanism 100. The output end of the first planetary reduction mechanism 210 is connected to the input end of the second planetary reduction mechanism 220, transmitting the torque output after the first stage of reduction and torque amplification by the first planetary reduction mechanism 210 to the second planetary reduction mechanism 220. The output end of the second planetary reduction mechanism 220 is connected to the input end of the third planetary reduction mechanism 230, transmitting the torque output after the second stage of reduction and torque amplification by the second planetary reduction mechanism 220 to the third planetary reduction mechanism 230. After the third planetary reduction mechanism 230 completes the third stage of reduction and torque amplification of the input torque, it drives the external load through its output end.

[0038] Furthermore, the first planetary reduction mechanism 210 may include, but is not limited to, a sun gear integrated shaft 211 and a plurality of first planetary gears 212. The second planetary reduction mechanism 220 may include, but is not limited to, a first sun gear integrated frame 221 and a plurality of second planetary gears 222. The third planetary reduction mechanism 230 may include, but is not limited to, a second sun gear integrated frame 231, an output shaft integrated frame 232, and a plurality of third planetary gears 233. The shaft portion of the sun gear integrated shaft 211 is connected to the self-locking mechanism 100 for transmission. The gear portion of the sun gear integrated shaft 211 is located in the middle of the plurality of first planetary gears 212 and meshes with each of the first planetary gears 212. The plurality of first planetary gears 212 are located within the first gear ring 300 and each of the first planetary gears 212 meshes with the first gear ring 300. In this way, the torque output in the positive direction by the self-locking mechanism 100 can be transmitted to the first planetary reduction mechanism 210 to complete the first stage of reduction and torque increase; at the same time, the integrated design of the sun gear integrated shaft 211 is beneficial to shortening the axial dimension of the reduction gearbox 1000. The frame portion of the first sun gear carrier 221 is drivenly connected to a plurality of first planetary gears 212. The gear portion of the first sun gear carrier 221 is located in the middle of a plurality of second planetary gears 222 and meshes with each of the second planetary gears 222. The plurality of second planetary gears 222 are located within and mesh with the second ring gear 400. In this manner, the torque output from the first planetary reduction mechanism 210 can be transmitted to the second planetary reduction mechanism 220 to complete the second-stage reduction and torque increase; simultaneously, the integrated design of the first sun gear carrier 221 helps to shorten the axial dimension of the reduction gearbox 1000. The frame portion of the second sun gear carrier 231 is drivenly connected to a plurality of second planetary gears 222. The gear portion of the second sun gear carrier 231 is located in the middle of a plurality of third planetary gears 233 and meshes with each of the third planetary gears 233. The plurality of third planetary gears 233 are located within the second ring gear 400, and each of the third planetary gears 233 meshes with the second ring gear 400. In this way, the torque output from the second planetary reduction mechanism 220 can be transmitted to the third planetary reduction mechanism 230 to complete the third-stage reduction and torque increase; at the same time, the integrated design of the second sun gear integrated frame 231 helps to shorten the axial dimension of the gearbox 1000. The frame portion of the output shaft integrated frame 232 is connected to several third planetary gears 233 for transmission. The shaft portion of the output shaft integrated frame 232 is used to drive external loads. By separating the first gear ring 300 and the second gear ring 400, only the second gear ring 400 needs to be reinforced to ensure that it can withstand greater meshing stress, thus allowing the gearbox 1000 to balance cost and strength.

[0039] In this embodiment, the gear portion of the sun gear integrated shaft 211, the first planetary gear 212, and the first ring gear 300 are all helical gears. By using helical gear meshing for speed reduction in the first planetary reduction mechanism 210 and the first ring gear 300, vibration and abnormal noise caused by the high-speed output of the motor 2000 at the output end can be avoided in the reduction gearbox 1000, thereby reducing noise. The shaft portion of the sun gear integrated shaft 211 passes through the rolling bearing 800. The rolling bearing 800 can withstand the axial force generated by the meshing transmission between the gear portion of the sun gear integrated shaft 211 and the first planetary gear 212. The gear portion of the first sun gear integrated carrier 221, the second planetary gear 222, the gear portion of the second sun gear integrated carrier 231, the third planetary gear 233, and the second ring gear 400 are all spur gears. By using spur gear meshing for speed reduction in the second planetary reduction mechanism 220 and the second ring gear 400, the use of heavy-duty thrust bearings can be avoided, and the production and assembly costs of spur gears are lower, thereby helping to reduce the cost of the reduction gearbox 1000.

[0040] Furthermore, several shims 240 are provided between any two adjacent planetary reduction mechanisms 200 to compensate for the axial clearance between the planetary reduction mechanisms 1000, preventing axial movement of the planetary reduction mechanisms 200 and thus avoiding noise. The shims 240 can also adjust the meshing depth between the planetary gears and the sun gear or internal gear ring in the planetary reduction mechanism 200, thereby ensuring the consistency of the meshing depth between gears. Simultaneously, the shims 240 also prevent direct contact between adjacent planetary reduction mechanisms 200 and reduce wear caused by rotation, thereby extending the service life of the planetary reduction mechanism 200 and reducing maintenance costs.

[0041] Furthermore, the number of shims 240 between any two adjacent planetary reduction gears 200 is equal to the total number of sun gears and planet gears in each planetary reduction gear 200. The individual shim design allows for more flexible adjustments. Moreover, when a shim is damaged, only the damaged shim needs to be replaced, resulting in lower maintenance costs.

[0042] Specifically, a shim 240 is provided between the sun gear integrated shaft 211 and the first sun gear integrated frame 221, between the first sun gear integrated frame 221 and the second sun gear integrated frame 231, and between the second sun gear integrated frame 231 and the output shaft integrated frame 232 to eliminate gaps between the sun gear integrated shaft 211 and the first sun gear integrated frame 221, between the first sun gear integrated frame 221 and the second sun gear integrated frame 231, and between the second sun gear integrated frame 231 and the output shaft integrated frame 232. Several shims 240 are also provided between several first planetary gears 212 and the first sun gear integrated frame 221, several second planetary gears 222 and the second sun gear integrated frame 231, and several third planetary gears 233 and the output shaft integrated frame 232 to eliminate gaps between the several first planetary gears 212 and the first sun gear integrated frame 221, several second planetary gears 222 and the second sun gear integrated frame 231, and several third planetary gears 233 and the output shaft integrated frame 232. Optionally, gasket 240 is a stainless steel gasket to improve the wear resistance and service life of gasket 240.

[0043] Furthermore, the gearbox 1000 also includes a central shaft 600. The central shaft 600 passes through the sun gear integrated shaft 211, the first sun gear integrated frame 221, the second sun gear integrated frame 231, and the output shaft integrated frame 232 to ensure the coaxiality of each rotating component and to obtain a better reduction ratio.

[0044] In some other embodiments, the central shaft 600 can be a soft central shaft to achieve automatic load sharing among the first planetary reduction mechanism 210, the second planetary reduction mechanism 220, and the third planetary reduction mechanism 230. Furthermore, the soft central shaft can also absorb vibration and reduce noise.

[0045] Please refer to the following: Figures 5-11 , Figure 11 This is a schematic diagram of the end cover structure provided in some embodiments of this application. The gearbox 1000 also includes an end cover 900. The end cover 900 is fixed to the end of the housing 500 away from the motor 2000 to seal the housing 500. The end cover 900 is provided with a first fixing hole 910, a second fixing hole 920, and a third fixing hole 930. The first fixing hole 910, the second fixing hole 920, and the third fixing hole 930 are arranged around the housing 500. The line connecting the center of the first fixing hole 910, the center of the second fixing hole 920, and the center of the third fixing hole 930 forms a triangle, so that the gearbox 1000 can be firmly fixed to the mounting base of the electric pedal 4000 through the end cover 900.

[0046] Furthermore, the triangle is an equilateral triangle. The side length L of the triangle is greater than or equal to 70mm and less than or equal to 80mm, so that the gearbox 1000 can be firmly and compactly fixed to the mounting base of the electric pedal 4000. Specifically, the side length L of the triangle can be 70mm, 71mm, 72mm, 72.8mm, 73.2mm, 73.7mm, 74mm, 74.6mm, 75.1mm, 75.5mm, 76mm, 77mm, 78mm, 78.8mm, 79mm, or 80mm, etc. In this embodiment, the side length L of the triangle is approximately 75mm.

[0047] The gearbox 1000 provided in this application includes: a plurality of planetary reduction mechanisms 200, which are connected in series; the input ends of the planetary reduction mechanisms 200 are used to connect to the output ends of a motor 2000; and the output ends of the planetary reduction mechanisms 200 are used to drive an external load. A plurality of shims 240 are provided between any two adjacent planetary reduction mechanisms 200. In the technical solution of this application, by providing a plurality of shims 240 between any two adjacent planetary reduction mechanisms 200, the axial clearance between the planetary reduction mechanisms 1000 is compensated, preventing axial movement of the planetary reduction mechanisms 1000 and the generation of noise. Furthermore, the shims 240 can adjust the meshing depth between the planetary gears and the sun gear or internal gear ring in the planetary reduction mechanism 1000, thereby ensuring the consistency of the meshing depth between gears. Simultaneously, the shims 240 can also prevent direct contact between two planetary reduction mechanisms 1000 and reduce wear caused by rotation, thereby extending the service life of the planetary reduction mechanism 1000 and reducing maintenance costs. In this way, the Gearbox 1000 has the advantages of low noise, high consistency, and low maintenance costs.

[0048] The above description is only a part of the embodiments of this application and does not limit the scope of protection of this application. Any equivalent device or equivalent process transformation made based on the content of this application specification and drawings, or direct or indirect application in other related technical fields, are similarly included in the patent protection scope of this application.

Claims

1. A gearbox, characterized in that, include: A plurality of planetary reduction gears are connected in series for transmission. The input end of the plurality of planetary reduction gears is used to connect to the output end of the motor, and the output end of the plurality of planetary reduction gears is used to drive an external load. Several shims are provided between any two adjacent planetary deceleration mechanisms.

2. The gearbox according to claim 1, characterized in that, The number of shims between any two adjacent planetary reduction mechanisms is equal to the total number of sun gears and planet gears in each planetary reduction mechanism.

3. The gearbox according to claim 2, characterized in that, The plurality of planetary deceleration mechanisms include: The first planetary reduction mechanism includes a first gear ring, a sun gear integrated shaft, and a plurality of first planet gears. The gear portion of the sun gear integrated shaft is located in the middle of the plurality of first planet gears and meshes with the plurality of first planet gears. The plurality of first planet gears are located inside the first gear ring and mesh with the first gear ring. The second planetary reduction mechanism includes a second gear ring, a first sun gear carrier, and a plurality of second planet gears. The frame portion of the first sun gear carrier is connected to the plurality of first planet gears via a transmission. The gear portion of the first sun gear carrier is located in the middle of the plurality of second planet gears and meshes with the plurality of second planet gears. The plurality of second planet gears are located inside the second gear ring and mesh with the second gear ring. The third planetary reduction mechanism includes a second sun gear integrated frame, an output shaft integrated frame, and a plurality of third planetary gears. The frame portion of the second sun gear integrated frame is connected to the plurality of second planetary gears via a transmission. The gear portion of the second sun gear integrated frame is located in the middle of the plurality of third planetary gears and meshes with the plurality of third planetary gears. The frame portion of the output shaft integrated frame is connected to the plurality of third planetary gears via a transmission. The plurality of third planetary gears are located inside the second gear ring and mesh with the second gear ring. A gasket is provided between the sun gear integrated shaft and the first sun gear integrated frame, between the first sun gear integrated frame and the second sun gear integrated frame, and between the second sun gear integrated frame and the output shaft integrated frame. A plurality of gaskets are provided between the plurality of first planet gears and the first sun gear integrated frame, between the plurality of second planet gears and the second sun gear integrated frame, and between the plurality of third planet gears and the output shaft integrated frame.

4. The gearbox according to claim 3, characterized in that, The gear portion of the sun gear integrated shaft, the first planet gear, and the first gear ring are all helical gears. The gear portion of the first sun gear assembly, the second planetary gear, the gear portion of the second sun gear assembly, the third planetary gear, and the second gear ring are all spur gears.

5. The gearbox according to claim 4, characterized in that, The gearbox also includes a housing, the first gear ring and the second gear ring are fitted together, the first gear ring and the second gear ring are both housed in the housing, the inner wall of the housing is provided with a plurality of limiting grooves, and the first gear ring and the second gear ring are limited and connected to the housing through the plurality of limiting grooves.

6. The gearbox according to claim 1, characterized in that, The gearbox also includes a self-locking mechanism, the input end of which is connected to the output end of the motor, and the output end of which is connected to the input end of the plurality of planetary reduction mechanisms.

7. The gearbox according to claim 1, characterized in that, The gasket is a stainless steel gasket.

8. The gearbox according to claim 3, characterized in that, The gearbox also includes a central shaft, which passes through the sun gear integrated shaft, the first sun gear integrated frame, the second sun gear integrated frame, and the output shaft integrated frame.

9. The gearbox according to claim 8, characterized in that, The central axis is a soft central axis.

10. A geared motor, characterized in that, The device includes a motor and a gearbox, wherein the motor is fixed to the gearbox along the length of the gearbox; wherein the gearbox is a gearbox as described in any one of claims 1-9.

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