Transmission device, driving assembly and vehicle

Abstract

The invention discloses a transmission device, a driving assembly and a vehicle. The transmission device comprises a shell, an electrified rotating piece, a bearing and a conductive piece. Wherein the electrified rotating piece is supported on the shell through the bearing; the conductive part is provided with a first contact end and a second contact end, the first contact end abuts against a bearing inner ring of the bearing, and the second contact end is used for being grounded, so that current on the electrified rotating part sequentially passes through the bearing inner ring and the conductive part to flow to the shell, and a closed current loop is formed. And current flows through an oil film in the bearing as little as possible, so that electrocorrosion to the bearing is relieved, and damage such as local burning and melting of the bearing is relieved.

Description

Technical Field

[0001] The present application relates to the field of electromechanics, and more particularly to a transmission device, a drive assembly, and a vehicle. Background Art

[0002] In a motor, a motor shaft is assembled on a housing through a bearing. During the operation of the motor, a voltage is generated on the motor shaft, creating a voltage difference between the motor shaft and the housing, causing the oil film inside the bearing to be broken down to form a closed current loop, resulting in electro-corrosion of the bearing, and thus causing hazards such as local melting of the bearing. Summary of the Invention

[0003] The present application is proposed to solve at least one of the above problems. According to a first aspect of the present application, there is provided a transmission device, the transmission device including: a housing, a charged rotating member, a bearing, and a conductive member; wherein, the charged rotating member is supported on the housing through the bearing; the conductive member has a first contact end and a second contact end, the first contact end abuts against the inner ring of the bearing, and the second contact end is for grounding.

[0004] In an embodiment of the present application, the first contact end includes a brush or a carbon brush that abuts against the inner ring of the bearing.

[0005] In an embodiment of the present application, the number of the conductive members is multiple, and the multiple conductive members are distributed around the side surface of the inner ring of the bearing.

[0006] In an embodiment of the present application, the conductive member is spaced apart from the charged rotating member.

[0007] In an embodiment of the present application, the first contact end abuts against the side surface on one axial side of the inner ring of the bearing.

[0008] In an embodiment of the present application, the transmission device further includes: a support frame, and the conductive member is arranged on the housing through the support frame.

[0009] In an embodiment of the present application, the support frame includes a body part, and the body part is annular; the body part is provided with through holes, and the conductive member is assembled on the through holes.

[0010] In an embodiment of the present application, the number of the through holes is multiple, and the number of the conductive members is multiple; each conductive member corresponds to a through hole and is assembled in the corresponding through hole.

[0011] In an embodiment of the present application, the transmission device further includes: a first seal, and the first seal is configured to isolate the space where the rolling elements of the bearing are located and the space where the conductive member is located.

[0012] In one embodiment of the present application, the inner ring of the bearing has a raceway rib extending in the axial direction of the bearing.

[0013] In one embodiment of the present application, the first seal includes a first sealing lip that abuts against a first radial surface of the raceway rib, wherein the first radial surface faces the outer ring of the bearing.

[0014] In one embodiment of the present application, the first seal includes a second sealing lip that abuts against an axial surface of the raceway rib.

[0015] In one embodiment of the present application, at least a portion of the first contact end abuts against a second radial surface of the raceway rib, wherein the second radial surface faces the axis of the inner ring of the bearing.

[0016] In one embodiment of the present application, the transmission device further includes: a second seal configured to isolate the space where the rolling elements of the bearing are located and the space outside the outer ring of the bearing.

[0017] In one embodiment of the present application, a limiting protrusion is provided on the support frame, and the limiting protrusion abuts against an axial side surface of the outer ring of the bearing.

[0018] In one embodiment of the present application, the limiting protrusion is a first annular protrusion.

[0019] In one embodiment of the present application, the transmission device further includes: a third seal configured to isolate the space where the conductive member is located and the internal space of the housing.

[0020] According to a second aspect of the present application, there is also provided a drive assembly, which includes any one of the above-mentioned transmission devices.

[0021] According to a third aspect of the present application, there is also provided a vehicle, which includes any one of the above-mentioned drive assemblies.

[0022] According to the transmission device, drive assembly, and vehicle provided by the embodiments of the present application, by providing a conductive member having a first contact end and a second contact end, the first contact end abuts against the inner ring of the bearing, and the second contact end is used for grounding, so that the current on the charged rotating member flows through the inner ring of the bearing and the conductive member to the housing in sequence, forming a closed current loop, minimizing the current flowing through the oil film in the bearing, alleviating the electrical corrosion of the bearing, and alleviating hazards such as local melting of the bearing. Description of the Drawings

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 Partial cross-sectional view of the support frame, conductive member and bearing shown in an embodiment of the present invention;

[0025] Figure 2 Schematic structural diagram of the support frame shown in an embodiment of the present invention;

[0026] Figure 3 For Figure 2 Schematic side view of the support frame shown;

[0027] Figure 4 For Figure 2 Schematic top view of the support frame shown;

[0028] Figure 5 For Figure 2 Schematic bottom view of the support frame shown;

[0029] Figure 6 For Figure 5 Schematic cross-sectional structural diagram of the support frame in the A-A section shown;

[0030] Figure 7 Schematic structural diagram of the conductive member shown in an embodiment of the present invention;

[0031] Figure 8 Cross-sectional view of the support frame, conductive member, bearing and charged rotating member in the shaft assembly shown in another embodiment of the present invention;

[0032] Figure 9 For Figure 8 Partial enlarged view in the cross-sectional view shown;

[0033] Figure 10 Schematic cross-sectional view of the drive assembly shown in an embodiment of the present invention;

[0034] Figure 11 Current loop of the reducer part in the drive assembly in the related art;

[0035] Figure 12 Current loop of the reducer part in the drive assembly shown in an embodiment of the present invention.

[0036] Reference numerals:

[0037] 10 - Support frame 11 - First annular protrusion 12 - Second annular protrusion

[0038] 13 - shaft hole, 14 - through hole, 20 - conductive part, 21 - conductive brush, 22 - mounting seat

[0039] 31 - inner ring of bearing, 311 - raceway rib, 312 - first radial surface

[0040] 313 - axial surface, 314 - second radial surface, 32 - outer ring of bearing

[0041] 33 - rolling element, 40 - charged rotating part, 51 - second seal, 52 - first seal

[0042] 521 - first sealing lip, 522 - second sealing lip, 53 - third seal, 60 - housing Detailed implementation manners

[0043] In order to make the objectives, technical solutions and advantages of the present invention more apparent, exemplary embodiments according to the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments of the present invention. It should be understood that the present invention is not limited by the exemplary embodiments described herein. Based on the embodiments of the present invention described herein, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present invention.

[0044] In the following description, numerous specific details are given to provide a more thorough understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without one or more of these details. In other instances, in order to avoid confusion with the present invention, some well - known technical features are not described.

[0045] It should be understood that the present invention can be implemented in different forms and should not be construed as limited to the embodiments presented herein. On the contrary, providing these embodiments will make the disclosure thorough and complete, and will fully convey the scope of the present invention to those skilled in the art.

[0046] The purpose of the terms used herein is only to describe specific embodiments and is not a limitation of the present invention. When used herein, the singular forms "a", "an" and "the" are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms "comprising" and / or "including", when used in this specification, identify the presence of the described features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups. When used herein, the term "and / or" includes any and all combinations of the related listed items.

[0047] To thoroughly understand the present invention, detailed structures will be presented in the following description to illustrate the technical solutions proposed by the present invention. The optional embodiments of the present invention are described in detail below. However, in addition to these detailed descriptions, the present invention may have other implementation manners.

[0048] The following will, with reference to the accompanying drawings, elaborate on some embodiments of the present invention. Without conflict, the following embodiments and the features in the embodiments may be combined with each other.

[0049] First, an application scenario of the conductive structure shown in the examples of the present application will be introduced. The conductive structure is applied at the assembly position of the shaft and the bearing to conduct the current on the shaft to the housing through the inner ring of the bearing and the transmission device.

[0050] Referring to Figure 1 、 Figure 8 and Figure 9 , an embodiment of the present application provides a transmission device, which includes: a housing 60, a charged rotating member 40, a bearing, and a conductive member 20; wherein, the charged rotating member 40 is supported on the housing 60 by the bearing; the conductive member 40 has a first contact end and a second contact end, the first contact end abuts against the inner ring 31 of the bearing, and the second contact end is used for grounding.

[0051] In the above solution, by providing the conductive member 20 with a first contact end and a second contact end, the first contact end abuts against the inner ring 31 of the bearing, and the second contact end is used for grounding, so that the current on the charged rotating member 40 flows through the inner ring 31 of the bearing and the conductive member 20 to the housing 60 in sequence, forming a closed current loop, minimizing the current flowing through the oil film in the bearing, alleviating the electrical corrosion of the bearing, and alleviating hazards such as local melting of the bearing. The following will, with reference to the accompanying drawings, elaborate on each of the above structures in detail.

[0052] When setting the housing 60, referring to Figure 1 、 Figure 8 and Figure 9 , the housing 60 can be any housing 60 that can accommodate and support the charged rotating member 40. Exemplarily, the housing 60 can be made of a conductive material. Exemplarily, the housing 60 can be directly grounded or in contact with the ground through a grounding wire during the assembly process.

[0053] When setting the charged rotating member 40, referring to Figure 1 、 Figure 8 and Figure 9, the charged rotating member 40 can be any rotating member that is charged during operation. Exemplarily, the charged rotating member 40 can include a rotating shaft, and the rotating shaft can be, for example but not limited to, the rotating shaft in the rotor of an electric motor. Of course, the charged rotating member 40 can also be a rotating shaft such as the main shaft or the auxiliary shaft in an electric motor or a speed reducer. Exemplarily, the charged rotating member 40 can be the output shaft in devices such as an electric motor, that is, the charged rotating member 40 can be the main shaft. Exemplarily, the charged rotating member 40 can also be a transmission shaft. Exemplarily, the charged rotating member 40 can be the auxiliary shaft inside an electric motor, a speed reducer, etc. Exemplarily, the inner ring 31 of the bearing can be arranged at the thinner diameter part of the charged rotating member 40.

[0054] Reference Figure 1 , Figure 8 and Figure 9 , the charged rotating member 40 is supported on the housing 60 by bearings, and the specific setting method can adopt various methods. Exemplarily, a bearing seat can be arranged on the housing 60, a bearing is assembled on the charged rotating member 40, and the bearing is assembled in the bearing seat. The bearing includes an inner ring 31 of the bearing, an outer ring 32 of the bearing, and rolling elements 33 located between the inner ring 31 of the bearing and the outer ring 32 of the bearing. The rolling elements 33 can be, for example but not limited to, rolling elements such as ball bearings. Among them, the inner ring 31 of the bearing is assembled on the rotating shaft of the charged rotating member 40, and the specific assembly method can adopt fixed connection methods such as, for example but not limited to, interference fit, key connection, etc. The outer ring 32 of the bearing is assembled on the housing 60, and specifically, fixed connection methods such as, for example but not limited to, interference fit, key connection, etc. can be adopted. Thus, the charged rotating member 40 can rotate relative to the housing 60.

[0055] When setting the conductive member 20, reference Figure 1 , Figure 8 and Figure 9 , the conductive member 20 has a first contact end and a second contact end. Among them, the first contact end abuts against the inner ring 31 of the bearing, and the second contact end is used for grounding. Thus, the current on the charged rotating member 40 flows through the inner ring 31 of the bearing and the conductive member 20 to the housing 60 in sequence, forming a closed current loop, so that the current flows through the oil film in the bearing as little as possible, alleviating the electrical corrosion of the bearing and hazards such as local melting of the bearing.

[0056] When realizing that the first contact end abuts against the inner ring 31 of the bearing, various methods can be adopted. Exemplarily, reference Figure 1 , Figure 8 and Figure 9, the first contact end may include a brush or a carbon brush that abuts against the inner ring 31 of the bearing. That is, a conductive brush 21 is provided at the first contact end. The conductive brush 21 may be, for example but not limited to, a brush or a carbon brush. The conductive brush 21 abuts against the inner ring 31 of the bearing, so that the first end of the conductive member 20 does not interfere with the rotation of the inner ring 31 of the bearing, and at the same time, an electrical connection can be established between the inner ring 31 of the bearing and the first contact end of the conductive member 20.

[0057] Exemplarily, referring to Figure 1 , Figure 8 and Figure 9 , the first contact end may abut against the axial side surface of the inner ring 31 of the bearing. That is, the first contact end abuts against the axial side surface of the inner ring 31 of the bearing. Of course, in other embodiments, the first contact end may also abut against other surface positions of the inner ring 31 of the bearing.

[0058] When setting the conductive member 20, referring to Figure 1 , Figure 5 , Figure 8 and Figure 9 , the number of the conductive members 20 may be one or multiple. When the number of the conductive members 20 is multiple, exemplarily, the multiple conductive members 20 may be distributed around the side surface of the inner ring 31 of the bearing. In a more optimal embodiment, the multiple conductive members 20 may be evenly spaced in the circumferential direction around the side surface of the inner ring 31 of the bearing.

[0059] Exemplarily, referring to Figure 1 , Figure 8 and Figure 9 , a gap may be provided between the conductive member 20 and the charged rotating member 40, that is, there is a gap between the conductive member 20 and the charged rotating member 40. Thus, during the rotation of the charged rotating member 40, the charged rotating member 40 and the conductive member 20 are not in direct conductive contact, and the charged rotating member 40 is in conductive contact with the first contact end of the conductive member 20 through the inner ring 31 of the bearing. Thus, the conductive member 20 does not interfere with the rotation of the charged rotating member 40.

[0060] Exemplarily, referring to Figure 1 , Figure 8 and Figure 9 , the transmission device may further include: a support frame 10. The conductive member 20 is arranged on the housing 60 through the support frame 10 to solve the support problem of the conductive member 20. Exemplarily, the second contact end of the conductive member 20 is connected to the support frame 10. By adding the support frame 10, it is convenient to support and fix the conductive member 20. Exemplarily, when the number of the conductive members 20 is multiple, the multiple conductive members 20 may be connected to the same support frame 10, thereby improving the integration of components.

[0061] When setting up the support frame 10, various methods can be adopted. Exemplarily, the support frame 10 may include a body part, and the body part is annular. Exemplarily, the body part may be sleeved on the charged rotating part 40 and be opposite to the side position of the inner ring 31 of the bearing on one axial side. The conductive part 20 is assembled on the body part, so as to facilitate the first contact end of the conductive part 20 to abut against the inner ring 31 of the bearing. Exemplarily, referring to Figure 1 , Figure 2 , Figure 4 , Figure 5 and Figure 9 , a through hole 14 may be provided in the body part, and the conductive part 20 is assembled on the through hole 14, so as to facilitate the assembly of the conductive part 20 on the support frame 10. Exemplarily, the conductive part 20 may be assembled in the through hole 14 by detachable methods such as but not limited to interference fit, snap connection, threaded connection, etc., so as to facilitate the replacement of the conductive part 20. Exemplarily, the number of through holes 14 provided in the body part may be one or multiple. Exemplarily, when multiple through holes 14 are provided in the body part, the number of conductive parts 20 may also be multiple. The number of the provided conductive parts 20 may be equal to the number of through holes 14 on the body part. The multiple conductive parts 20 correspond to the multiple through holes 14 one by one. Each conductive part 20 corresponds to a through hole 14 and is assembled in the corresponding through hole 14, which is convenient for replacing some or all of the conductive parts 20.

[0062] Exemplarily, any support frame made of conductive material can be adopted. For example, the support frame 10 can be made of metal material. As a carrier for setting and fixing the conductive part 20, the support frame 10 has excellent electrical conductivity. Exemplarily, referring to Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 , the support frame 10 can be a ring-shaped plate structure. Exemplarily, the support frame 10 can also be a plate structure. And the support frame 10 is connected to the housing 60. The housing 60 can be a metal housing, a grounding housing, a box body, etc. of an electromechanical device. The specific connection method of the support frame 10 to the housing 60 can adopt various methods. Exemplarily, the support frame 10 can be fixed on the housing 60 by bolt connection, and the support frame 10 can also be assembled in the assembly hole of the housing 60 by interference fit. Exemplarily, a bearing seat is provided on the housing 60, and the support frame 10 can be assembled in the bearing seat by bolt connection, interference fit, etc.

[0063] Exemplarily, referring to Figure 8 and Figure 9, the support frame 10 of the transmission device can be assembled in the assembly hole of the housing 60 by an interference fit method. There is an interference fit between the outer ring of the support frame 10 and the housing 60. The conductive member 20 on the support frame 10 is press-fitted together with the side surface of the inner ring 31 of the bearing, so that the conductive member 20 is in contact with the inner ring 31 of the bearing, and the support frame 10 is in contact with the housing 60 to form an electrical conduction loop.

[0064] Exemplarily, referring to Figure 1 , Figure 8 and Figure 9 , the conductive member 20 is arranged on the support frame 10, and the conductive member 20 abuts against the side surface of the inner ring 31 of the bearing. That is, the conductive member 20 is connected between the inner ring 31 of the bearing and the support frame 10 and is used to conduct the current of the inner ring 31 of the bearing to the support frame 10. The inner ring 31 of the bearing is assembled on the charged rotating part 40. The charged rotating part 40 may include a rotating shaft. During the rotation of the charged rotating part 40, the charged rotating part 40 drives the inner ring 31 of the bearing to rotate. After the conductive member 20 is assembled, it abuts against the side surface on one axial side of the inner ring 31 of the bearing. It should be explained that the side surface on one axial side of the inner ring 31 of the bearing refers to: after the bearing is assembled on the charged rotating part 40, the surface of the inner ring 31 of the bearing perpendicular to the axis of the charged rotating part 40. Since the conductive member 20 abuts against the inner ring 31 of the bearing, when there is a voltage difference between the charged rotating part 40 and the housing 60, the current on the charged rotating part 40 can sequentially pass through the inner ring 31 of the bearing, the conductive member 20, and the support frame 10 and be conducted to the housing 60, so that the current of the inner ring 31 of the bearing flows to the housing 60 through the conductive member 20 and the support frame 10 in sequence, forming a closed current loop, minimizing the current flowing through the oil film in the bearing, alleviating the electrical corrosion of the bearing, and alleviating hazards such as local melting of the bearing.

[0065] In related technologies, the conductive brushes are usually arranged circumferentially on the surface of the charged rotating member 40, and friction contact is made between the conductive brushes and the charged rotating member 40. In the transmission device shown in the embodiments of the present application, the conductive member 20 is arranged axially, and the position of current conduction can be changed from the charged rotating member 40 to the inner ring 31 of the bearing, and then transmitted to the housing 60 through the conductive member 20 and the support frame 10. Since the diameter of the position on the conductive member 20 in contact with the inner ring 31 of the bearing is larger than that of the charged rotating member 40, the arrangement density of the conductive member 20 can be increased, so that a parallel current path is formed between the plurality of conductive members 20 and the inner ring 31 of the bearing, the resistance between the conductive member 20 and the inner ring 31 of the bearing is reduced, the conduction efficiency is improved, and more current is transmitted from between the conductive member 20 and the inner ring 31 of the bearing to the external housing 60. Moreover, the axial arrangement method adopted in the present application is less likely to cause interference compared with the circumferential arrangement in related technologies, so that the conductive member 20 can be arranged more densely, the arrangement density of the conductive member 20 is increased, and the conduction efficiency is further improved. In the circumferential arrangement method in related technologies, after the conductive brush 21 and the charged rotating member 40 run in friction contact for a period of time, the charged rotating member 40 needs to be replaced for maintenance. In the present application, after the conductive member 20 and the inner ring 31 of the bearing run in friction contact for a period of time, the inner ring 31 of the bearing can be replaced for maintenance. The replacement difficulty of the inner ring 31 of the bearing is much smaller and the cost is much lower than that of the charged rotating member 40, which is convenient for later maintenance.

[0066] Exemplarily, refer to Figure 1 and Figure 7, the conductive member 20 may include a conductive brush 21, and the brush or carbon brush of the conductive brush 21 abuts against the side surface of the inner ring 31 of the bearing on one axial side. Thus, when the charged rotating member 40 drives the inner ring 31 of the bearing to rotate, the side surface of the inner ring 31 of the bearing is in frictional contact with the brush of the conductive brush 21, enabling the inner ring 31 of the bearing to transmit current to the conductive brush 21 and improving the anti-wear ability of the conductive member 20. Exemplarily, the brush of the conductive brush 21 may be perpendicular or substantially perpendicular to the side surface of the inner ring 31 of the bearing, that is, the conductive brush 21 is parallel or substantially parallel to the charged rotating member 40. This facilitates the stable and reliable abutment of the brush of the conductive brush 21 on the side surface of the inner ring 31 of the bearing. Exemplarily, the conductive brush 21 may further have a mounting seat 22 for arranging the brush, and the mounting seat 22 is fixed on the support frame 10. The shape of the mounting seat 22 of the conductive brush 21 may be cylindrical, and at this time, the conductive brush 21 is in a shape similar to a cylinder. The shape of the mounting seat 22 of the conductive brush 21 may also be arc-shaped, and the radius of the arc may match the diameter of the inner ring 31 of the bearing, thereby increasing the contact area between the conductive brush 21 and the inner ring 31 of the bearing, and reducing the resistance value of the electrical connection between each conductive brush 21 and the side surface of the inner ring 31 of the bearing. Exemplarily, the base of the conductive brush 21 may also be an integral structure with the support frame 10, thereby simplifying the structural connection mode of the support frame 10 and the conductive brush 21.

[0067] Exemplarily, referring to Figure 2 and Figure 5 , the number of the conductive brushes 21 is multiple. For example, the number of the conductive brushes 21 may be two, three, four, eight, twelve, twenty, etc., and is specifically related to the size of the conductive brush 21 and the size of the inner ring 31 of the bearing. Exemplarily, multiple conductive brushes 21 may be distributed around the side surface of the inner ring 31 of the bearing, that is, the brush of each conductive brush 21 can abut against the side surface of the inner ring 31 of the bearing. When the number of the conductive brushes 21 is multiple, the multiple conductive brushes 21 form a multi-section resistance parallel structure, reducing the resistance of the conductive path and improving the conductive efficiency. It should be noted that the conductive member 20 is not limited to the conductive brush 21 shown above. In addition, other structures may also be adopted.

[0068] Exemplarily, referring to Figure 1 , Figure 6 and Figure 9 , a through hole 14 for installing the conductive brush 21 is provided on the support frame 10, and the mounting seat 22 of the conductive brush 21 is assembled in the through hole 14. Exemplarily, the conductive brush 21 may include a brush or a carbon brush. The mounting seat 22 of the conductive brush 21 may be an aluminum column, and the aluminum column is axially assembled on the support frame 10. Compared with the traditional conductive brush structure, it can reduce the installation interval between adjacent two conductive brushes 21, increase the installation density, reduce the damage to the charged rotating member 40, and improve the conductive efficiency. Moreover, it is also convenient for individually disassembling and assembling some or all of the conductive brushes 21 for replacement.

[0069] Exemplarily, referring to Figure 1 、 Figure 8 and Figure 9 , the transmission device may further include: a first seal 52 configured to isolate the space where the rolling elements 33 of the bearing are located and the space where the conductive member 20 is located. That is, the first seal 52 is used to isolate the space between the inner ring 31 and the outer ring 32 of the bearing, as well as the space where the conductive member 20 is located. In the space between the inner ring 31 and the outer ring 32 of the bearing, not only are there rolling elements 33, but also lubricating oil is injected into the space between the inner ring 31 and the outer ring 32 during application. In this embodiment, by providing the first seal 52, the first seal 52 isolates the space where the rolling elements 33 are located and the space where the conductive member 20 is located, thereby solving the problem that the lubricating oil in the rolling elements 33 affects the conductivity of the conductive member 20. Exemplarily, a seal ring, such as but not limited to, may be used as the first seal 52. Exemplarily, the first seal 52 may be provided on the support frame 10. Of course, in other embodiments, a support structure for supporting the first seal 52 may be additionally provided.

[0070] Exemplarily, referring to Figure 1 and Figure 9 , the inner ring 31 of the bearing may have a raceway rib 311 extending in the axial direction of the bearing. As Figure 1 and Figure 9 shown, it can be seen that the raceway rib 311 is a protrusion extending from the side surface of the inner ring 31 of the bearing on one axial side, and the extending direction is the axial direction of the bearing, so that the side surface of the inner ring 31 of the bearing on one axial side has a stepped-like step. By adopting this setting method, it is convenient to increase the surface area of the inner ring 31 of the bearing, and it is convenient to increase the contact area between the first contact end and the inner ring 31 of the bearing, thereby reducing the resistance between the conductive member 20 and the inner ring 31 of the bearing and improving the conduction efficiency. Exemplarily, referring to Figure 1 and Figure 9 , at least a part of the first contact end can be abutted against the second radial surface 314 of the raceway rib 311, wherein the second radial surface 314 faces the axis of the inner ring 31 of the bearing. Exemplarily, all of the first contact end can be abutted against the second radial surface 314 of the raceway rib 311. Exemplarily, referring to Figure 1 and Figure 9 , a part of the first contact end can also be abutted against the second radial surface 314 of the raceway rib 311, and a part can be abutted against the side surface of the inner ring 31 of the bearing facing the axial side. Exemplarily, referring to Figure 1 and Figure 9, the end surface of the body part of the conductive brush 21 far from the support frame 10 abuts against the side surface of the inner ring 31 of the bearing facing the axial side, and a part of the side surface of the conductive brush 21 abuts against the second radial surface 314 of the raceway rib 311.

[0071] Reference Figure 1 , Figure 5 , Figure 6 , Figure 8 and Figure 9 , the transmission device may further include: a first seal 52, the first seal 52 is disposed on the support frame 10, the first seal 52 abuts against the raceway rib 311 of the inner ring of the bearing, the conductive member 20 is located inside the first seal 52, and the rolling element 33 is located outside the first seal 52. To prevent the oil between the inner ring 31 and the outer ring 32 of the bearing from leaking from the first seal 52 onto the conductive member 20 and affecting the conductivity of the conductive member 20; it can also prevent materials such as bristles and particulate impurities that fall off during the frictional contact between the conductive member 20 and the inner ring 31 of the bearing from running into the oil between the outer ring 32 and the inner ring 31 of the bearing. The conductive member 20 and the oil inside the bearing are separated by the first seal 52, so that the conductive member 20 and the oil inside the bearing do not interfere with each other. And in the above manner, by combining the sealing structure with the conductive member 20, not only the sealing performance is improved, but also while playing the role of bearing sealing, it can also play a conductive role, thereby reducing the layout space and improving the integration of components. When setting the first seal 52, various methods can be adopted.

[0072] Exemplarily, reference Figure 1 , Figure 5 , Figure 6 , Figure 8 and Figure 9 , the first seal 52 may include a first sealing lip 521, the first sealing lip 521 abuts against the first radial surface 312 of the raceway rib 311 of the inner ring 31 of the bearing, reference Figure 1 and Figure 9, the first radial surface 312 faces away from the axis line of the bearing inner ring 31, that is, the first radial surface 312 faces the bearing outer ring 32 of the bearing. The first sealing lip 521 is a sealing ring protrusion on the first seal 52 on the side facing the bearing inner ring 31. After being assembled on the bearing, the first sealing lip 521 abuts against the first radial surface 312 of the raceway rib 311 of the bearing inner ring 31, which can prevent the oil inside the bearing from leaking out, ensure the cleanliness of the space, and at the same time prevent the influence on the electrical conductivity of the electrical component 20. It should be noted that the raceway rib 311 of the bearing inner ring 31 has two surfaces, one of which is the first radial surface 312 facing the bearing outer ring 32, and the other is the circumferential surface facing the axial direction of the charged rotating part 40. By abutting the first sealing lip 521 against the first radial surface 312 of the raceway rib 311 of the bearing inner ring 31, it can better prevent the oil between the bearing inner ring 31 and the bearing outer ring 32 from leaking to the electrical component 20, thereby improving the sealing effect.

[0073] Exemplarily, referring to Figure 1 , Figure 5 , Figure 6 , Figure 8 and Figure 9 , the first seal 52 may further include a second sealing lip 522, and the second sealing lip 522 abuts against the axial surface 313 of the raceway rib 311. The second sealing lip 522 is a sealing ring protrusion on the first seal 52 on the side facing the bearing. After being assembled on the bearing, the second sealing lip 522 abuts against the axial surface 313 of the raceway rib 311 of the bearing inner ring 31, which can prevent foreign objects from entering the bearing interior, ensure the cleanliness of the space, and at the same time prevent the influence on the electrical conductivity of the electrical component 20. By abutting the second sealing lip 522 against the axial surface 313 of the raceway rib 311 of the bearing inner ring 31, it can better prevent impurities such as bristles and particles generated during the frictional contact between the electrical component 20 and the bearing inner ring 31 from running into the space between the bearing outer ring 32 and the bearing inner ring 31, preventing damage to the bearing, thereby improving the sealing effect.

[0074] Exemplarily, referring to Figure 1 , Figure 5 , Figure 6 , Figure 8 and Figure 9, the transmission device may further include: a second annular protrusion 12, the second annular protrusion 12 is disposed on the support frame 10, and at least a part of the first seal 52 is assembled on the second annular protrusion 12; wherein, the conductive member 20 is located within the second annular protrusion 12. The second annular protrusion 12 and the first annular protrusion 11 are disposed on the same side of the support frame 10, both facing the bearing direction. At least a part of the first seal 52 is assembled on the second annular protrusion 12. Since the side of the support frame 10 facing the bearing is provided not only with the conductive member 20 but also with the first annular protrusion 11 in some embodiments, the distance between the main body portion of the support frame 10 and the inner ring 31 of the bearing is relatively large. In this embodiment, the second annular protrusion 12 is specifically provided for the first seal 52, and the position of the second annular protrusion 12 is substantially flush with or higher than the raceway edge 311 of the inner ring 31 of the bearing, and the gap between the second annular protrusion 12 and the axial surface 313 of the raceway edge 311 of the inner ring 31 of the bearing is small. Thus, when at least a part of the first seal 52 is assembled on the second annular protrusion 12, the sealing and isolation effect of the first seal 52 between the bearing inner and the conductive member 20 can be improved, and the assembly method of the first seal 52 can be simplified. Of course, in other embodiments, the first seal 52 may be directly disposed on the support frame 10.

[0075] Exemplarily, referring to Figure 1 , Figure 5 , Figure 6 , Figure 8 and Figure 9 , the first seal 52 may only include the part disposed on the end face and side face of the second annular protrusion 12, and does not include the part disposed on the surface of the support frame 10. Exemplarily, the first seal 52 may further include the part disposed on the surface of the support frame 10.

[0076] Exemplarily, referring to Figure 1 , Figure 8 and Figure 9, the transmission device may further include: a second seal 51 configured to isolate the space where the rolling elements 33 of the bearing are located and the space outside the outer ring 32 of the bearing. Since the space between the inner ring 31 and the outer ring 32 of the bearing is filled with lubricating oil and provided with rolling elements 33, it is necessary to ensure a certain degree of cleanliness. In this embodiment, by providing the second seal 51, the second seal 51 isolates the space where the rolling elements 33 of the bearing are located and the space outside the outer ring 32 of the bearing, so as to prevent foreign matters such as dust and impurities on the outer ring 32 of the bearing from entering the space where the rolling elements 33 are located, thus solving the problem of foreign matters such as dust and impurities entering the space of the rolling elements 33. Exemplarily, a seal ring, such as but not limited to, may be used as the second seal 51. When supporting the second seal 51, various methods can be adopted. Exemplarily, the second seal 51 can be provided on the support frame 10. Exemplarily, the second seal 51 can also be provided on the outer ring 32 of the bearing. Even an additional support structure for supporting the second seal 51 can be added.

[0077] Exemplarily, the second seal 51 and the first seal 52 can be an integral structure, thereby simplifying the number of seal rings and facilitating the assembly of the seal rings between the support frame 10 and the bearing. Of course, in other embodiments, refer to Figure 8 and Figure 9 , only the first seal 52 can be provided without providing the second seal 51.

[0078] Exemplarily, refer to Figure 1 , Figure 8 and Figure 9 , a limiting protrusion can be provided on the support frame 10, and the limiting protrusion abuts against the side surface of the axial side of the outer ring 32 of the bearing to solve the problem of the support stability between the support frame 10 and the housing 30. In some embodiments, the second seal 51 can be provided on the limiting protrusion to facilitate the support of the second seal 51, thereby additionally solving the support problem of the second seal 51.

[0079] Exemplarily, refer to Figure 1 , Figure 6 , Figure 8 and Figure 9, the transmission device may further include: a limiting protrusion disposed on the support frame 10 and abutted against the side surface of the outer ring 32 of the bearing on one axial side. Wherein, the outer ring 32 of the bearing is assembled on the inner ring 31 of the bearing. It should be noted that the side surface of the outer ring 32 of the bearing on one axial side refers to the surface of the outer ring 32 of the bearing perpendicular to the axis of the charged rotating member 40 after the bearing is assembled on the charged rotating member 40. Exemplarily, the limiting protrusion and the conductive member 20 may be located on the same side of the bearing. Since the limiting protrusion is used to abut against the side surface of the outer ring 32 of the bearing, and the outer ring 32 of the bearing is often assembled in the bearing seat by an interference fit, the end surface of the limiting protrusion can be abutted against the side surface of the outer ring 32 of the bearing to axially limit the outer ring 32 of the bearing and prevent the bearing from generating axial displacement. The outer ring 32 of the bearing can be assembled on the inner ring 31 of the bearing through rolling elements 33 and a cage. Exemplarily, a raceway may be provided on the outer surface of the inner ring 31 of the bearing, and raceway ribs 311 may be provided on both sides of the raceway. The rolling elements 33 are assembled in the raceway. Exemplarily, a raceway may be provided on the inner surface of the outer ring 32 of the bearing, and the rolling elements 33 and the cage are assembled between the raceways of the outer ring 32 and the inner ring 31 of the bearing.

[0080] Exemplarily, referring to Figure 1 , Figure 6 , Figure 8 and Figure 9 , the limiting protrusion may be an integral structure with the support frame 10, that is, the support frame 10 and the limiting protrusion may be integrally connected by means such as but not limited to casting and milling, so as to simplify the connection method between the support frame 10 and the limiting protrusion. Of course, in other embodiments, the limiting protrusion may be fixed to the support frame 10 by means such as but not limited to screw fastening, welding, and clamping.

[0081] Exemplarily, referring to Figure 1 , Figure 6 , Figure 8 and Figure 9 , the limiting protrusion may be a first annular protrusion 11, that is, the limiting protrusion is an annular first annular protrusion 11, so that the first annular protrusion 11 is configured to exactly abut against the entire side surface of the outer ring 32 of the bearing, so as to increase the abutting area between the limiting protrusion and the side surface of the outer ring 32 of the bearing, and also enable the limiting protrusion to be evenly distributed along the circumference of the outer ring 32 of the bearing, so that the axial limiting strength at each position of the outer ring 32 of the bearing is basically the same, and the effect of axially limiting the bearing is improved. The first annular protrusion 11 encloses an annular ring. Exemplarily, the conductive brush 21 and the rolling elements 33 of the bearing may be located inside the annular ring enclosed by the first annular protrusion 11, that is, the first annular protrusion 11 surrounds the outside of the conductive brush 21 and the rolling elements 33, so as to facilitate the conductive brush 21 and the first annular protrusion 11 to respectively abut against the side surfaces of the inner ring 31 and the outer ring 32 of the bearing without interference.

[0082] Exemplarily, referring to Figure 1 、 Figure 6 、 Figure 8 and Figure 9 , the diameter of the first annular protrusion 11 may be equal to or greater than the diameter of the bearing outer ring 32. Exemplarily, when the diameters of the first annular protrusion 11 and the second seal 51 are greater than the diameter of the bearing outer ring 32, the support frame 10 may be connected to the housing 60 by means of bolt connection to prevent axial displacement of the bearing. If the diameters of the first annular protrusion 11 and the second seal 51 are equal to the diameter of the bearing outer ring 32, the support frame 10 and the bearing outer ring 32 may be assembled in the bearing seat by means of interference fit to prevent axial displacement of the bearing and play a role in limiting the bearing.

[0083] Exemplarily, referring to Figure 1 、 Figure 5 and Figure 6 , the transmission device may further include: a second seal 51, at least a part of the second seal 51 is assembled on the surface of the first annular protrusion 11, and the second seal 51 is used to be arranged between the side surfaces of the first annular protrusion 11 and the bearing outer ring 32. That is, a sealed connection is made between the first annular protrusion 11 and the bearing outer ring 32 through the second seal 51, so as to improve the sealing performance between the side surface of the bearing outer ring 32 and the first annular protrusion 11, prevent the oil inside the bearing from leaking out, and at the same time prevent dust and impurities outside the bearing outer ring 32 from entering the space where the rolling elements 33 inside the bearing are located. Exemplarily, the second seal 51 may only include the part connected between the surface of the first annular protrusion 11 and the side surface of the bearing outer ring 32. Exemplarily, in addition to the part connected between the surface of the first annular protrusion 11 and the side surface of the bearing outer ring 32, the second seal 51 may further include the part assembled on the inner wall of the first limiting protrusion and the support frame 10. Exemplarily, the conductive member 20 is located inside the second seal 51. In the above manner, by combining the sealing structure with the conductive member 20, not only the sealing performance is improved, but also while playing the role of bearing sealing, it can also play a conductive role, thereby reducing the layout space and improving the integration of components.

[0084] Exemplarily, referring to Figure 1 、 Figure 6 、 Figure 8 and Figure 9, the transmission device may further include: a third seal 53 configured to isolate the space where the conductive member 20 is located from the internal space of the housing 60, so that the internal space of the housing 60 and the space where the conductive member 20 is located are two isolated spaces, solving the problem that the lubricating oil / foreign matter inside the housing 60 affects the conductivity of the conductive member 20. Exemplarily, the third seal 53 may be in the form of a sealing ring. Regarding the setting of the third seal 53, various methods can be adopted. Exemplarily, the third seal 53 may be provided on the support frame 10. Exemplarily, the third seal 53 may also be provided on an additionally added support structure. Exemplarily, the third seal 53 may also be provided on the inner wall of the housing 60 opposite to the support frame 10.

[0085] Exemplarily, referring to Figure 1 , Figure 2 , Figure 5 , Figure 6 , Figure 8 and Figure 9 , a shaft hole 13 may further be provided on the support frame 10 for setting the charged rotating member 40, and a bearing inner ring 31 is assembled on the charged rotating member 40. Among them, the conductive members 20 are distributed around the shaft hole 13. Exemplarily, when the number of the conductive members 20 is multiple, the multiple conductive members 20 may be evenly spaced in the circumferential direction around the shaft hole 13. The size of the shaft hole 13 is specifically related to the size of the charged rotating member 40 equipped with the bearing inner ring 31. Exemplarily, the shaft hole 13 and the bearing inner ring 31 may be concentrically arranged. Of course, in other embodiments, the support frame 10 may not be provided with the shaft hole 13. At this time, the support frame 10 may be assembled at the end position of the charged rotating member 40.

[0086] Exemplarily, referring to Figure 1 , Figure 8 and Figure 9, the size of the shaft hole 13 can be configured so that the shaft hole 13 is configured to have a clearance fit with the charged rotating part 40. Thus, during the rotation of the charged rotating part 40, the charged rotating part 40 and the support frame 10 do not contact and interfere with each other. Exemplarily, in some embodiments, a third seal 53 may be provided at the shaft hole 13, and the third seal 53 abuts against the surface of the charged rotating part 40. This can not only prevent impurities such as bristles and particles generated during the frictional contact between the conductive part 20 and the inner ring 31 of the bearing from diffusing out through the gap between the charged rotating part 40 and the shaft hole 13; but also prevent substances such as but not limited to dust, impurities, and oil in other spaces within the housing 60 from entering the space where the conductive part 20 is located. Moreover, when the charged rotating part 40 is assembled in an oil environment such as cooling oil or lubricating oil, it can also prevent external oil from entering the space where the conductive part 20 is located through the gap between the charged rotating part 40 and the shaft hole 13, thereby controlling the non-diffusion of the current transmission path between the charged rotating part 40 and the housing 60. That is, the third seal 53 can prevent foreign objects from entering the space where the conductive part 20 is located, prevent wear of the conductive part, and also prevent the influence on the conductivity of the conductive part 20. And in the above manner, by combining the sealing structure with the conductive part 20, not only the sealing performance is improved, but also while playing the role of bearing sealing, it can also play a conductive role, thereby reducing the layout space and improving the integration of components.

[0087] Exemplarily, referring to Figure 10 , the support frame 10 and the bearing can be respectively installed at the shaft ends on both sides of the rear end cover of the motor and the secondary shaft of the reducer. The conductive part 20 and the support frame 10 are installed on the side of the bearing by a press-fitting method. The axial movement of the bearing is restricted by the radial interference fit and the above-mentioned limiting protrusions. The support frame 10 and the conductive part 20 are installed close to the bearing. The conductive part 20, the seal, the limiting protrusions, etc. on the support frame 10 have good rigidity and coaxiality, ensuring effective contact between the conductive part 20 and the charged rotating part 40 and the housing 60. At the same time, the shaft hole 13 of the bearing can be assembled at a shaft section with a smaller diameter on the charged rotating part 40, where the linear velocity is smaller, which can improve the wear resistance of the conductive part 20.

[0088] In the various embodiments shown above, by providing the conductive part 20 having a first contact end and a second contact end, the first contact end abuts against the inner ring 31 of the bearing, and the second contact end is used for grounding. Thus, the current on the charged rotating part 40 flows through the inner ring 31 of the bearing and the conductive part 20 to the housing 60 in sequence, forming a closed current loop, minimizing the current flowing through the oil film in the bearing, alleviating the electrical corrosion of the bearing, and alleviating hazards such as local melting of the bearing.

[0089] In a drive assembly such as, but not limited to, an electromechanical device, a voltage difference is generated between the energized rotating part 40 of the motor and the housing, that is, an axial voltage is generated on the energized rotating part 40. The reasons for the generation of the axial voltage are as follows: the magnetic flux asymmetry caused by the asymmetry of the magnetic circuit and the circuit in the motor leads to the generation of the axial voltage, or a voltage difference is generated between the energized rotating part 40 of the motor and the housing due to reasons such as static charges generated by the friction between the motor rotor and the air during high-speed operation. After the axial voltage is generated on the energized rotating part 40, in the related art, the current on the energized rotating part 40 is transmitted to the outside of the housing 60 through the inner ring 31 of the bearing, the rolling element 33, and the outer ring 32 of the bearing. Specifically, referring to Figure 11 , the generated current will also be conducted to the reduction gear shaft of the speed reducer of the electromechanical device, and its current path is as shown in Figure 11 . In the multiple current loops formed in the speed reducer, the current passes through the main shaft bearing of the speed reducer, the auxiliary shaft bearing of the speed reducer, and the support bearing of the differential, and then is transmitted to the grounded box body. However, this current transmission path will cause the oil film at the bearing to be broken down to form a closed loop, resulting in electro-corrosion of the bearing and causing hazards such as local melting of the bearing.

[0090] The embodiment of the present invention provides a transmission device for solving the problem of electro-corrosion of the bearing caused by the axial voltage under high power output of the motor, referring to Figure 12 . By adding a current bypass, a conductive part 20 is additionally assembled on the electric motor of the electric drive assembly, so that the current from the energized rotating part 40 such as the motor is mainly conducted to the housing 60 such as the box body through the conductive part 20 with a lower resistance and the support frame 10, reducing the flow of the shaft current from the bearing to the housing 60, thereby reducing the risk of electro-corrosion of the bearing in the current loop and reducing the axial voltage of the shaft system such as the main shaft of the speed reducer. Moreover, after adding the transmission device, since the parallel resistance of the designed conductive part 20 is much smaller than that of the bearing, most of the current is ensured to be conducted to the housing 60 through the newly added transmission device.

[0091] Furthermore, the embodiment of the present application also provides a drive assembly, referring to Figures 1 to 12 . The drive assembly includes any one of the above-mentioned transmission devices. Exemplarily, the drive assembly may be the electromechanical device, and the electromechanical device may be an electromechanical device such as a motor, a speed reducer, a transmission, etc. Exemplarily, the drive assembly may only include a drive motor, and the energized rotating part 40 may be the output shaft of the drive motor. Exemplarily, the drive assembly may further include a drive motor and a speed reducer, and the energized rotating part 40 may be the energized rotating shaft in the drive motor or the speed reducer. The housing 60 may be a housing, a support housing, a grounded housing, etc. made of a conductive material. Exemplarily, a bearing seat may be provided on the housing 60, and the energized rotating part 40 is assembled on the bearing seat through a bearing, so as to be able to rotate relative to the bearing seat. Exemplarily, the conductive part 20 may be arranged in the bearing seat.

[0092] In addition, an embodiment of the present application further provides a vehicle. Refer to Figures 1 to 12 , the vehicle includes any one of the above drive assemblies. The vehicle can be a vehicle of types such as, but not limited to, electric vehicles, hybrid electric vehicles, etc.

[0093] The present invention has been illustrated by the above embodiments. However, it should be understood that the above embodiments are only for the purpose of exemplification and illustration, and are not intended to limit the present invention to the scope of the described embodiments. In addition, those skilled in the art can understand that the present invention is not limited to the above embodiments, and more variations and modifications can be made according to the teachings of the present invention, and these variations and modifications all fall within the scope claimed by the present invention. The protection scope of the present invention is defined by the appended claims and their equivalent scope.

Claims

1. A transmission device, characterized in that, Comprising: A housing; A charged rotating member; A bearing, the charged rotating member being supported on the housing by the bearing; A conductive member having a first contact end and a second contact end, the first contact end abutting against the inner race of the bearing, and the second contact end being for grounding.

2. The transmission device according to claim 1, wherein The first contact end includes a brush or a carbon brush abutting against the inner race of the bearing.

3. The transmission device according to claim 1, characterized in that The number of the conductive members is plural, and the plural conductive members are distributed around the side surface of the inner race of the bearing.

4. The transmission device according to any one of claims 1 to 3, characterized in that, The conductive members are arranged at intervals from the charged rotating member.

5. The transmission device according to claim 1, characterized in that, The first contact end abuts against the side surface on one axial side of the inner race of the bearing.

6. The transmission device according to claim 1, wherein Further comprising: A support frame, the conductive member being arranged on the housing through the support frame.

7. The transmission device according to claim 6, wherein, The support frame includes a body portion which is annular; The body portion is provided with through holes, and the conductive members are assembled on the through holes.

8. The transmission device according to claim 7, wherein, The number of the through holes is plural, and the number of the conductive members is plural; Each conductive member corresponds to one through hole and is assembled in the corresponding through hole.

9. The transmission device according to claim 1 or 6, characterized in that, Further comprising: A first seal configured to isolate the space where the rolling elements of the bearing are located and the space where the conductive members are located.

10. The transmission device according to claim 9, characterized in that, The inner race of the bearing has a raceway rib extending in the axial direction of the bearing.

11. The transmission device according to claim 10, characterized in that, The first seal includes a first seal lip abutting against the first radial surface of the raceway rib, wherein the first radial surface faces the outer race of the bearing.

12. The transmission device according to claim 10, characterized in that, The first seal includes a second seal lip abutting against the axial surface of the raceway rib.

13. The transmission device according to claim 10, wherein At least a part of the first contact end abuts against the second radial surface of the raceway rib, wherein the second radial surface faces the axis of the inner race of the bearing.

14. The transmission device according to claim 6, characterized in that, Further comprising: A second seal configured to isolate the space where the rolling elements of the bearing are located and the space outside the outer race of the bearing.

15. The transmission device according to claim 6 or 14, characterized in that, A limiting protrusion is provided on the support frame and abuts against the side surface on one axial side of the outer race of the bearing.

16. The transmission device according to claim 15, characterized in that, The limiting protrusion is a first annular protrusion.

17. The transmission device according to claim 1 or 6, characterized in that, Further comprising: A third seal configured to isolate the space where the conductive members are located and the inner space of the housing.

18. A drive assembly, characterized in that, Comprising the transmission device according to any one of claims 1 to 17.

19. A vehicle, characterized in that, Comprising the drive assembly according to claim 18.

Images