CN221487028U - Conductive assembly, speed reducer, driving assembly and vehicle - Google Patents

Abstract

Conductive component, the reduction gear, drive assembly and vehicle, conductive component is applicable to and installs on the rotating member, and conductive component includes conductive brush and sealed lid, and sealed lid is suitable for encircling the rotating member setting, and sealed lid and conductive brush set gradually along the axial of rotating member, sealed lid are equipped with the through-hole that runs through sealed lid along the rotating member axial, and sealed lid is connected on the conductive brush along the one end of the axis of through-hole, is equipped with the portion of leading oil on the pore wall of through-hole, and the portion of leading oil can throw away the lubricating oil that enters into in the through-hole under the rotatory effect of rotating member. According to the conductive assembly provided by the application, the oil guide part is arranged on the hole wall of the through hole of the sealing cover, so that when the conductive assembly is applied to a speed reducer, the lubricating oil entering the through hole can be thrown out to one side far away from the conductive brush by the arrangement of the oil guide part on the sealing cover when the rotating shaft of the speed reducer rotates, the effect of the sealing cover on preventing the lubricating oil from entering the conductive brush is improved, and the conductive performance of the conductive brush is improved.

Description

Conductive assembly, speed reducer, driving assembly and vehicle

Technical Field

The application relates to the technical field of driving assemblies, in particular to a conductive assembly, a speed reducer, a driving assembly and a vehicle.

Background

The drive assembly is the heart of the electric vehicle and includes a motor, a transmission, and an auxiliary transmission. The motor shaft and the reducer main shaft are rotatably arranged in the shell of the driving assembly through bearings, the motor is powered by the power battery of the electric vehicle, and can be driven to rotate, the motor shaft is connected with the reducer main shaft, and the electric vehicle is driven to run after being reduced by the reducer. In the working process of the motor, shaft voltage is formed on a motor shaft, if the shaft voltage exceeds a breakdown threshold value of lubricating oil in a bearing, partial discharge occurs between balls and a roller path of the bearing, an electric corrosion groove is formed on the roller path, and the bearing electric corrosion phenomenon occurs.

In order to solve the problem of electric corrosion of the bearing, generally, a ring brush is installed on a housing of the drive assembly, and bristles of the ring brush are made to electrically contact with a motor shaft or a reducer main shaft, so that the motor shaft or the reducer main shaft is electrically conducted with the housing of the drive assembly, and shaft voltage generated on the motor shaft in the working process of the motor is reduced, so that the electric corrosion of the bearing is avoided.

In the prior art, aiming at the sealing structure of the annular electric brush, the effect of the sealing cover for preventing lubricating oil from entering the annular electric brush is poor, and the lubricating oil in the driving assembly shell easily enters the annular electric brush to contact with the brush hair of the annular electric brush, so that the electric conductivity of the annular electric brush is reduced.

Disclosure of utility model

The application aims to provide a conductive assembly, a speed reducer, a driving assembly and a vehicle, and solves the problems that the effect of a sealing cover for preventing lubricating oil from entering a conductive brush is poor and the conductive performance of the conductive brush is low.

In order to achieve the purpose of the application, the application provides the following technical scheme:

In a first aspect, the present application provides a conductive assembly adapted for mounting on a rotating member, comprising:

a conductive brush adapted to be disposed around the rotating member;

The sealing cover is suitable for surrounding the rotating piece and is arranged along the axial direction of the rotating piece, the sealing cover is provided with a through hole which axially penetrates through the sealing cover along the rotating piece, one end of the axis of the through hole is attached to the conducting brush by the sealing cover, an oil guide part is arranged on the hole wall of the through hole, and the oil guide part can throw out lubricating oil entering the through hole under the rotating action of the rotating piece. In one embodiment, the oil guiding portion is an oil guiding groove, and an extending direction of the oil guiding groove is inclined with respect to an axial direction of the through hole.

In one embodiment, a plurality of oil guiding grooves are formed, and the plurality of oil guiding grooves are arranged at intervals along the circumferential direction of the through hole.

In one embodiment, the sealing cover comprises a first end face and a second end face, the through hole penetrates through the first end face and the second end face, the first end face is attached to the conductive brush, the oil guiding groove extends from the first end face to the second end face, and one end, away from the second end face, of the oil guiding groove is spaced from the first end face.

In one embodiment, the second end surface includes a first region and a second region, the first region is disposed around a circumference of the second region, the second region protrudes from the first region along an axial direction of the through hole, and an oil guiding surface is formed between the first region and the second region.

In one embodiment, the oil guiding surface comprises a guiding plane, which is parallel to the axis of the through hole.

In one embodiment, one of the conductive brush and the sealing cover is provided with a clamping groove, and the other one of the conductive brush and the sealing cover is provided with a buckle, and the buckle is clamped in the clamping groove.

In a second aspect, the present application also provides a speed reducer, comprising:

A speed reducer housing;

the rotating shaft is rotationally connected to the speed reducer shell;

The conductive assembly is characterized in that the conductive brush and the sealing cover are sleeved on the rotating shaft, and the conductive brush is fixedly connected to the speed reducer shell.

In one embodiment, the speed reducer further comprises a bearing, the bearing is sleeved on the rotating shaft, and the conductive component is located between the speed reducer shell and the bearing.

In one embodiment, the conductive brush comprises a conductive ring and a brush head arranged on the inner peripheral wall of the conductive ring, the conductive ring comprises a third end face and a fourth end face which are axially arranged at intervals along the rotating shaft, the third end face is propped against the inner wall of the reducer shell, the fourth end face is connected with the sealing cover, and the brush head is propped against the main shaft of the reducer.

In a third aspect, the application also provides a drive assembly comprising a motor and a reducer as described above, the motor comprising a motor shaft, the motor shaft being connected to the reducer spindle.

In a fourth aspect, the present application also provides a vehicle comprising a frame and a drive assembly as described above, the drive assembly being mounted to the frame.

The conductive assembly is suitable for being mounted on the rotating piece, the conductive brush and the sealing cover of the conductive assembly are sequentially arranged along the axial direction of the rotating piece, and the oil guide part is arranged on the hole wall of the through hole of the sealing cover and can throw out lubricating oil entering the through hole under the rotating action of the rotating piece. When the conductive component is applied to the speed reducer, the conductive component is sleeved on the rotating shaft of the speed reducer, and when the rotating shaft of the speed reducer rotates, the oil guiding part on the sealing cover can throw out lubricating oil entering the through hole to one side far away from the conductive brush, so that the effect of the sealing cover on preventing the lubricating oil from entering the conductive brush is improved, the lubricating oil is further prevented from entering the conductive brush, and the conductive performance of the conductive brush is improved.

Drawings

In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the application, and that other drawings can be obtained from them without inventive effort for a person skilled in the art.

FIG. 1 is a cross-sectional view of a drive assembly according to one embodiment of the present application;

FIG. 2 is an enlarged view of FIG. 1 at A;

FIG. 3 is a side view of a conductive assembly according to one embodiment of the present application;

fig. 4 is a front view of a conductive assembly according to one embodiment of the present application;

FIG. 5 is a cross-sectional view of A-A of FIG. 4;

FIG. 6 is a front view of a seal cap according to one embodiment of the present application;

FIG. 7 is a cross-sectional view of B-B of FIG. 6;

FIG. 8 is a side view of a seal cap with a clasp in one embodiment of the application;

FIG. 9 is a side view of a conductive brush according to one embodiment of the present application;

fig. 10 is a front view of a conductive brush according to an embodiment of the present application.

Reference numerals illustrate:

100. A motor; 110. a motor shaft; 120. a motor housing; 200. a speed reducer; 210. a rotation shaft; 220. a speed reducer housing; 300. a conductive assembly; 310. a conductive brush; 311. a conductive ring; 311a, a third end face; 311b, fourth end face; 311c, a clamping groove; 312. a brush head; 320. sealing cover; 321. a first end face; 322. a second end face; 323. a through hole; 324. an oil guiding groove; 325. a first region; 326. a second region; 327. an oil guiding surface; 327a, a guide plane; 327b, cambered surface; 328. a buckle; 328a, a stem; 328b, head; 328c, grooves; 328d, end walls; 328e, guide ramp; 400. and (3) a bearing.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, are intended to fall within the scope of the present application.

It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When a component is considered to be "connected" to another component, it can be directly connected to the other component or intervening components may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

Some embodiments of the present application are described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict.

The vehicle comprises a gasoline vehicle, a diesel vehicle, a natural gas vehicle, a hybrid power vehicle and an electric vehicle, wherein for the electric vehicle, the driving assembly is a heart of the vehicle, is arranged on the frame, and is powered by the power battery, so that the vehicle is driven to run.

Referring to fig. 1, fig. 1 is a cross-sectional view of a driving assembly according to an embodiment of the application, wherein the driving assembly includes a motor 100, a reducer 200 and an auxiliary transmission device. The motor shaft 110 and the rotation shaft 210 of the decelerator 200 are rotatably installed in a housing of the driving assembly through a bearing 400, the housing of the driving assembly including the decelerator housing 220 and the motor housing 120, the decelerator housing 220 being connected to the motor housing 120. After the motor 100 is powered, the motor shaft 110 can be driven to rotate, the motor shaft 110 is connected with the rotating shaft 210, the motor shaft 110 is decelerated by the speed reducer 200 and then drives the electric vehicle to run, in the working process of the motor 100, magnetic flux is asymmetric due to asymmetric magnetic circuits and circuits in the motor 100, or voltage difference is generated between the motor shaft 110 and a shell of the driving assembly due to static charge generated by friction between a rotor of the motor 100 and air during high-speed running, shaft voltage can be formed on the motor shaft 110 and transmitted to the rotating shaft 210, if the shaft voltage exceeds a breakdown threshold value of lubricating oil in a bearing 400 of the speed reducer 200, partial discharge occurs between balls and a roller path of the bearing 400, an electric corrosion groove is generated on the roller path, and the electric corrosion phenomenon of the bearing 400 occurs.

In the prior art, in order to solve the problem of electric corrosion of a bearing, an annular electric brush is arranged on a shell of a driving assembly, and bristles of the annular electric brush are electrically contacted with a motor shaft or a rotating shaft, so that the motor shaft or the rotating shaft is electrically communicated with the shell of the driving assembly, and the voltage of the shaft generated on the motor shaft in the working process of the motor is reduced, so that the electric corrosion of the bearing is avoided. However, the existing sealing structure for the annular electric brush has poor effect of preventing lubricating oil from entering the annular electric brush by the sealing cover, and the lubricating oil in the driving assembly shell easily enters the annular electric brush to contact with the brush hair of the annular electric brush, so that the electric conduction performance of the annular electric brush is reduced.

Referring to fig. 1, the present application provides a speed reducer 200, which includes a speed reducer housing 220, a rotation shaft 210, a conductive component 300 and a bearing 400, wherein the rotation shaft 210 may be a main shaft of the speed reducer 200, the rotation shaft 210 is rotatably connected to the speed reducer housing 220, the rotation shaft 210 is connected to a motor shaft 110, the conductive component 300 is sleeved on the rotation shaft 210, and the conductive component 300 is fixedly connected to an inner wall of the speed reducer housing 220, so that most of shaft current from the motor shaft 110 on the rotation shaft 210 flows out to the speed reducer housing 220 through the conductive component 300 due to the much smaller resistance of the conductive component 300 than the bearing 400, so as to reduce damage caused by the shaft current flowing into a transmission system, and prevent the shaft current from continuing to flow to a countershaft of the speed reducer 200 and a differential, and damage such as electric corrosion and pitting corrosion to the countershaft of the speed reducer 200 and the differential bearing 400.

Referring to fig. 1-7, the present application provides a conductive assembly 300, which is suitable for being mounted on a rotating member, and includes a conductive brush 310 and a sealing cover 320, wherein the conductive brush 310 is suitable for being disposed around the rotating member, the sealing cover 320 and the conductive brush 310 are sequentially disposed along an axial direction of the rotating member, the sealing cover 320 is provided with a through hole 323 penetrating through the sealing cover 320 along the axial direction of the rotating member, one end of the sealing cover 320 along an axis of the through hole 323 is attached to the conductive brush 310, an oil guiding portion is disposed on an inner wall of the through hole 323, and the oil guiding portion can throw out lubricating oil entering the through hole 323 under a rotation action of the rotating member. Specifically, the rotating member in the present application is the rotating shaft 210 in the speed reducer 200, the conductive brush 310 and the sealing cover 320 are both sleeved on the rotating shaft 210, when the rotating shaft 210 of the speed reducer 200 rotates, the oil guiding portion provided on the sealing cover 320 can throw out the lubricating oil entering the through hole 323 to the side far away from the conductive brush 310, so that the effect of the sealing cover 320 blocking the lubricating oil from entering the conductive brush 310 is improved, the lubricating oil is further inhibited from entering the conductive brush 310, the conductivity of the conductive brush 310 is improved, the shaft voltage on the rotating shaft 210 can be effectively transferred to the speed reducer housing 220, and the electric corrosion of the bearing 400 or other parts in the speed reducer housing 220 is avoided.

In one embodiment, the sealing cover 320 includes a first end surface 321 and a second end surface 322, the through hole 323 penetrates through the first end surface 321 and the second end surface 322, the first end surface 321 is connected with the conductive brush 310, the oil guiding part is an oil guiding groove 324, the oil guiding groove 324 extends from the first end surface 321 to the second end surface 322, one end, far away from the second end surface 322, of the oil guiding groove 324 is separated from the first end surface 321 by a distance d, d is greater than zero, and the extending direction of the oil guiding groove 324 is inclined relative to the axial direction of the through hole 323. Specifically, by providing the end of the oil guiding groove 324 away from the second end face 322 and the first end face 321 with a distance d, the hole wall of the through hole 323 between the end of the oil guiding groove 324 away from the second end face 322 and the first end face 321 is tightly matched with the rotating shaft 210, i.e. the oil guiding groove 324 does not penetrate the first end face 321, so as to prevent the lubricating oil in the reducer casing 220 from entering the conductive brush 310; when the rotation shaft 210 rotates, the oil guide groove 324 of the sealing cover 320 can store the lubricating oil entering the through hole 323 and throw the lubricating oil away from the conductive brush 310, so that the lubricating oil is further prevented from entering the conductive brush 310. The extending direction of the oil guiding groove 324 may have an inclination angle a of 30 °, 45 °, 60 ° with respect to the axial direction of the through hole 323, and the direction in which the oil guiding groove 324 is inclined from the first end surface 321 to the second end surface 322 should be along the rotation direction of the rotation shaft 210, so that when the rotation shaft 210 rotates, the lubricating oil entering the oil guiding groove 324 can be thrown out under the driving of the rotation shaft 210.

The conductive assembly 300 provided by the application is applicable to vehicles, as well as other use situations, such as mixers, cranes, etc. In particular, when suitable for other usage scenarios, those skilled in the art can specifically set up according to the present disclosure, and will not be described herein.

Referring to fig. 5 and 8, the conductive brush 310 includes a conductive ring 311 and a brush head 312 disposed on an inner peripheral wall of the conductive ring 311, the conductive ring 311 includes a third end surface 311a and a fourth end surface 311b disposed at intervals along an axial direction of the rotation shaft 210, the third end surface 311a abuts against an inner wall of the reducer housing 220, the fourth end surface 311b abuts against a first end surface 321 of the sealing cover 320, the brush head 312 abuts against the rotation shaft 210, and the brush head 312 is in interference fit with the rotation shaft 210, i.e., the conductive brush 310 is disposed between the reducer housing 220 and the sealing cover 320, and shaft current on the rotation shaft 210 is transmitted to the reducer housing 220 through the brush head 312 and the conductive ring 311; the bearing 400 is supported at the end of the rotating shaft 210, the conductive brush 310 is arranged between the bearing 400 and the shell, and the conductive brush 310 is arranged close to the bearing 400, namely, the conductive brush 310 is positioned at the end of the rotating shaft 210, so that the electric charge flowing into the rotating shaft 210 from the motor shaft 110 can be effectively led out, the contact area between the conductive brush 310 and the rotating shaft 210 has better rigidity and coaxiality, and the conductive brush 310 is effectively contacted with the rotating shaft 210 and the speed reducer shell 220; meanwhile, the inner diameter of the conductive brush 310 is matched with a smaller diameter part on the shaft section of the rotating shaft 210, the linear speed of the smaller diameter part is smaller, and the wear resistance of the conductive brush 310 can be improved.

The conductive ring 311 and the reducer housing 220 may be made of metal, such as aluminum, the brush head 312 may be a carbon brush, and the sealing cover 320 may be made of rubber, plastic, or the like, which is not particularly limited.

In one embodiment, the oil guiding grooves 324 on the sealing cover 320 are provided with a plurality of oil guiding grooves 324 along the circumferential direction of the through hole 323 at intervals, and the extending directions of the plurality of oil guiding grooves 324 are parallel, and the plurality of oil guiding grooves 324 are circumferentially arranged along the through hole 323, so that more lubricating oil can be stored, and the lubricating oil discharging efficiency is improved.

Referring to fig. 3, 6 and 7, the second end face 322 includes a first region 325 and a second region 326, the first region 325 is disposed around the second region 326, the second region 326 protrudes from the first region 325 along the axial direction of the through hole 323, and an oil guiding surface 327 is formed between the first region 325 and the second region 326. When the lubricant in the reducer casing 220 flows or splashes onto the second end face 322 under the driving of the rotating shaft 210, since the first region 325 of the second end face 322 is disposed around the circumference of the second region 326, i.e. the first region 325 is located at the outer edge of the second region 326, and the second region 326 protrudes out of the first region 325, the height of the first region 325 in the radial direction of the through hole 323 is further greater than the height of the second region 326 in the radial direction of the through hole 323, so as to form a height difference, the lubricant guiding surface 327 is connected between the first region 325 and the second region 326, and most of the lubricant can be guided out along the lubricant guiding surface 327 when splashed onto the first region 325, so as to reduce the lubricant entering the through hole 323 of the sealing cover 320.

Preferably, the oil guiding surface 327 is disposed around the circumference of the through hole 323, and the oil guiding surface 327 includes a guiding plane 327a, the guiding plane 327a being parallel to the axis of the through hole 323, the guiding plane 327a being disposed to guide the lubricating oil. Specifically, a plurality of guide planes 327a on the sealing cover 320 are provided, and two adjacent guide planes 327a are connected through an arc surface 327b, so that the plurality of guide planes 327a are arranged at intervals, and the oil blocking effect of the sealing cover 320 is improved.

In one embodiment, one of the conductive brush 310 and the sealing cover 320 is provided with a clamping groove 311c, and the other one of the conductive brush 310 and the sealing cover 320 is provided with a buckle 328, wherein the buckle 328 is clamped in the clamping groove 311c, that is, the conductive brush 310 and the sealing cover 320 are connected through a clamping structure, so that the assembly and the disassembly are convenient. Specifically, a buckle 328 may be disposed on the fourth end surface 311b of the conductive ring 311, and a slot 311c may be disposed on the sealing cover 320; or a clamping groove 311c is arranged on the conductive ring 311, and a clamping buckle 328 is arranged on the first end surface 321 of the sealing cover 320.

Referring to fig. 8, 9 and 10, the clamping groove 311c is disposed on the conductive brush 310, and the buckle 328 is disposed on the first end surface 321 of the sealing cover 320, and the sealing cover 320 is made of rubber, plastic or other materials, so that the buckle 328 has elasticity, and when the buckle 328 is matched with the clamping groove 311c, the buckle 328 is easy to deform and is convenient to be matched with the clamping groove 311c on the conductive ring 311.

In one embodiment, a plurality of clamping grooves 311c are formed in the conductive brush 310, a plurality of clamping buckles 328 are formed in the sealing cover 320, the number of the clamping buckles 328 corresponds to the number of the clamping grooves 311c one by one, the clamping grooves 311c are formed in the circumferential direction of the conductive brush 310, and the clamping buckles 328 are formed in the circumferential direction of the sealing cover 320. Specifically, the plurality of clamping grooves 311c are uniformly arranged, and the plurality of buckles 328 are uniformly arranged, so as to improve the connection strength between the sealing cover 320 and the conductive brush 310.

Referring to fig. 8, when the clips 328 are disposed on the sealing cover 320 and the clip grooves 311c are disposed on the conductive ring 311, each clip 328 includes a stem 328a and a head 328b connected to each other, one end of the stem 328a away from the head 328b is connected to the first end surface 321, and the width of the head 328b is larger than the diameter of the stem 328 a; and a groove 328c is formed in one end of the head portion 328b away from the shaft portion 328a toward one side of the shaft portion 328 a. Specifically, when the sealing cover 320 is assembled with the conductive brush 310, the clamping groove 311c on the conductive ring 311 presses the head 328b of the buckle 328 to deform into the groove 328c until the head 328b approaches an end wall 328d of the rod 328a to abut against the groove wall of the clamping groove 311c, the head 328b of the buckle 328 recovers under the elastic action of the head 328b, and the peripheral wall of the head 328b is a guiding inclined surface 328e, so as to guide the buckle 328, thereby facilitating the head 328b to enter the clamping groove 311c, and realizing quick connection and disassembly of the sealing cover 320 and the conductive brush 310. Meanwhile, the conductive brush 310 and the sealing cover 320 are integrated in one component, so that the occupied space is small, the integration level of the whole driving assembly is improved, the assembly is convenient, and the manufacturing cost is reduced.

In the description of the embodiments of the present application, it should be noted that, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like refer to the orientation or positional relationship described based on the drawings, which are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.

The above disclosure is only a preferred embodiment of the present application, and it should be understood that the scope of the application is not limited thereto, but all or part of the procedures for implementing the above embodiments can be modified by one skilled in the art according to the scope of the appended claims.

Claims (12)

1. A conductive assembly adapted for mounting on a rotating member, comprising:

a conductive brush adapted to be disposed around the rotating member;

The sealing cover is suitable for surrounding the rotating piece and is provided with a through hole penetrating through the sealing cover along the axial direction of the rotating piece, one end of the sealing cover along the axis of the through hole is attached to the conductive brush, the hole wall of the through hole is provided with an oil guide part, and the oil guide part can throw out lubricating oil entering the through hole under the rotating action of the rotating piece.

2. The conductive assembly according to claim 1, wherein the oil guiding portion is an oil guiding groove, and an extending direction of the oil guiding groove is inclined with respect to an axial direction of the through hole.

3. The conductive assembly of claim 2, wherein a plurality of oil guiding grooves are provided, and a plurality of oil guiding grooves are provided at intervals along the circumferential direction of the through hole.

4. The conductive assembly of claim 2 wherein the seal cap includes a first end face and a second end face, the through hole extending through the first end face and the second end face, the first end face being in registry with the conductive brush, the oil guide groove extending from the first end face toward the second end face, the end of the oil guide groove remote from the second end face being spaced from the first end face.

5. The conductive assembly of claim 4, wherein the second end surface includes a first region and a second region, the first region being disposed circumferentially around the second region, the second region protruding from the first region in an axial direction of the through hole, an oil guiding surface being formed between the first region and the second region.

6. The conductive assembly of claim 5, wherein the oil guiding surface comprises a guiding plane that is parallel to an axis of the through hole.

7. The electrical conductive assembly of claim 1, wherein one of the electrical conductive brush and the seal cap is provided with a snap fit, and the other is provided with a snap fit, the snap fit being snapped into the snap fit.

8. A speed reducer, characterized by comprising:

A speed reducer housing;

the rotating shaft is rotationally connected to the speed reducer shell;

The conductive assembly of any one of claims 1-7, wherein the conductive brush and the sealing cover are both sleeved on the rotating shaft, and the conductive brush is fixedly connected to the reducer housing.

9. The speed reducer of claim 8, further comprising a bearing, wherein the bearing is sleeved on the rotating shaft, and wherein the conductive assembly is positioned between the speed reducer housing and the bearing.

10. The speed reducer of claim 8, wherein the conductive brush comprises a conductive ring and a brush head arranged on the inner peripheral wall of the conductive ring, the conductive ring comprises a third end face and a fourth end face which are axially arranged at intervals along the rotating shaft, the third end face is propped against the inner wall of the speed reducer shell, the fourth end face is connected with the sealing cover, and the brush head is propped against the rotating shaft.

11. A drive assembly comprising a motor and a reducer according to any one of claims 8 to 10, the motor comprising a motor shaft, the motor shaft being connected to the rotating shaft.

12. A vehicle comprising a frame and the drive assembly of claim 11, wherein the drive assembly is mounted to the frame.