Electrically conductive bearing

Abstract

The utility model discloses a conductive bearing relates to the field of automobile parts. The conductive bearing includes bearing shell and sets up the rolling body at the bearing shell one end, the one end of rolling body exposes in the bearing shell outside, the other end of rolling body is provided with elastic part, and the rolling body is with the bearing shell between being provided with the retainer, through the elastic part makes the rolling body with retainer contact, thereby makes the rolling body pass through the retainer and the electrical connection of bearing shell. The conductive bearing, compared with traditional conductive bearing, the conductive bearing is convenient to install, and the installation space is small, and it is unnecessary complicated installation station design, second rolling body and the contact part of rotary variable shaft is point contact, and there is no power and torque loss, and because of point contact, makes the current transmission process not be affected by the rotary variable shaft rotating speed, and the conductive bearing function cost is low, and the structure is simple, and the convenient mass production.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts technology, specifically to a conductive bearing. Background Technology

[0002] With the development of new energy electric vehicles, the speed and voltage of electric vehicle drive motors are getting higher and higher, and the shaft voltage and shaft current are getting stronger and stronger. This leads to more frequent electro-corrosion of motor bearings and transmission gears in the gearbox, causing early gearbox failure and NVH problems.

[0003] Existing technical solutions involve the simultaneous use of ceramic ball bearings and conductive rings, forming a current path with one end blocked and the other open. Ceramic ball bearings are used to block the current at the non-output end of the motor to prevent loop current, while conductive rings release shaft voltage and current at the output end. However, in practical applications, the cost of the ceramic balls used in ceramic ball bearings is several times, even ten times, that of ordinary bearings, and the cost of conductive rings is also high. Furthermore, suitable placement space is required. The conductive ring is in direct contact with the high-speed shaft via the carbon brush, which can easily cause power loss. Additionally, after the conductive brush wears down, carbon brush fibers can easily enter the bearing, leading to bearing failure. Therefore, a conductive bearing is specifically provided to solve these problems. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a conductive bearing that solves the problems of high cost of existing insulated bearings, easy power loss of conductive rings, and easy entry of carbon brush fibers into the bearing after wear of conductive brushes, leading to bearing failure.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a conductive bearing, comprising a bearing housing and a rolling element disposed at one end of the bearing housing, one end of the rolling element being exposed outside the bearing housing, and an elastic element disposed at the other end of the rolling element, with a retaining element disposed between the rolling element and the bearing housing, the rolling element being brought into contact with the retaining element through the elastic element, thereby electrically connecting the rolling element to the bearing housing through the retaining element.

[0006] Preferably, the rolling element is spherical or cylindrical.

[0007] Preferably, the surface of the rolling element is provided with a conductive coating.

[0008] Preferably, the conductive coating is silver.

[0009] Preferably, the retaining element is made of a conductive material.

[0010] Preferably, the elastic element includes a memory spring disposed in the bearing housing, the extension and retraction direction of the memory spring being opposite to the rolling element.

[0011] Preferably, a rolling support plate is provided between the memory spring and the rolling element, and the rolling support plate remains in close contact with the rolling element under the action of the memory spring.

[0012] Preferably, a spring end cap is fixedly fitted to the end of the bearing housing, and the end of the memory spring away from the rolling support plate abuts against the spring end cap.

[0013] Preferably, the memory spring is a cylindrical helical spring or a wave spring.

[0014] Its beneficial effects are as follows: 1. In use, during the rotation of the resolver shaft, the rolling elements of this conductive bearing remain in contact with the resolver shaft under the action of the elastic element. At this time, the current is conducted to the rolling elements through the end of the resolver shaft, and then the rolling elements are electrically connected to the bearing housing through the retaining element, so that the current is conducted to the bearing housing through the retaining element, and finally to the assembly housing, thus maintaining conductivity throughout the rotation process. Compared with traditional conductive bearings, the contact between the rolling elements and the resolver shaft of this conductive bearing is point contact, with no power or torque loss; and because it is point contact, the current conduction is not affected by the resolver shaft speed.

[0015] 2. During assembly, the end of the bearing housing is fixedly embedded in the end face of the assembly housing to form an electrical connection between the bearing housing and the assembly housing. At the same time, the front end of the bearing housing is close to the resolver shaft, so that the rolling elements abut against the end of the resolver shaft. This makes installation convenient, requires little installation space, and does not require complex installation station design. Furthermore, this conductive bearing has low functional cost, simple structure, and is easy to mass-produce. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the assembly state of the conductive bearing of this utility model.

[0018] In the diagram: 1. Bearing housing; 2. Spring end cap; 3. Memory spring; 4. Retainer; 5. Rolling element; 6. Rolling support plate; 7. Assembly housing; 8. Resolver shaft; 9. Resolver body. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments of this utility model are described clearly and completely. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0020] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0021] This utility model discloses a conductive bearing, according to the appendix. Figure 1 and attached Figure 2 As shown, the bearing includes a bearing housing 1 and a rolling element 5 disposed at one end of the bearing housing 1. One end of the rolling element 5 is exposed outside the bearing housing 1, and an elastic element is disposed at the other end of the rolling element 5. A retaining element 4 is disposed between the rolling element 5 and the bearing housing 1. The rolling element 5 is brought into contact with the retaining element 4 through the elastic element, thereby making the rolling element 5 electrically connected to the bearing housing 1 through the retaining element 4.

[0022] Working principle: During assembly, the end of the bearing housing 1 is fixedly embedded in the end face of the assembly housing 7, so that the bearing housing 1 and the assembly housing 7 are electrically connected. At the same time, the front end of the bearing housing 1 is close to the resolver body 9, so that the rolling element 5 abuts against the end of the resolver shaft 8. During use, when the resolver shaft 8 rotates, under the action of the elastic element, the rolling element 5 always remains in contact with the resolver shaft 8. At this time, the current is conducted to the rolling element 5 through the end of the resolver shaft 8, and then the retaining element 4 makes the rolling element 5 electrically connected to the bearing housing 1, so that the current is conducted to the bearing housing 1 through the retaining element 4, and finally to the assembly housing 7, thereby maintaining conductivity during rotation. Compared with traditional conductive bearings, this conductive bearing is easy to install, requires little installation space, and does not require complex installation station design. Secondly, the contact part between the rolling element 5 and the resolver shaft 8 is point contact, with no power or torque loss. Furthermore, due to the point contact, the current conduction process is not affected by the rotational speed of the resolver shaft 8. In addition, this conductive bearing has low functional cost, simple structure, and is easy to mass-produce.

[0023] Furthermore, the rolling element 5 is spherical or cylindrical. During use, it contacts the resolver shaft 8 through its arc-shaped surface, always maintaining point contact to reduce frictional resistance. At the same time, it ensures stable electrical conductivity and eliminates power and torque loss.

[0024] Furthermore, the surface of the rolling element 5 is provided with a conductive coating, which can be silver or any other conductive coating. Through the coating design, the entire rolling element 5 can effectively conduct current. At the same time, the rolling element 5 itself can be made of other non-metallic materials, which reduces the overall cost. However, for some usage scenarios where it is inconvenient to disassemble and replace, the rolling element 5 can also be made of pure metal or other conductive materials, so that the whole thing always has a conductive effect and extends its service life.

[0025] Furthermore, the retainer 4 is made of conductive material. The retainer 4 has a groove that matches the rolling element 5, so that the rolling element 5 is always kept in the groove under the action of the elastic element, avoiding circuit disconnection and ensuring the stability of current conduction. At the same time, the outer side of the retainer 4 is in contact with the inner wall of the bearing housing 1, thereby ensuring that the current is effectively conducted to the bearing housing 1. In the whole scheme, it is used to install and position the rolling element 5 and conduct current.

[0026] Furthermore, the elastic element includes a memory spring 3 disposed in the bearing housing 1. The extension and retraction direction of the memory spring 3 is opposite to that of the rolling element 5. Through the elastic action of the memory spring 3, the rolling element 5 is always tightly attached to the retainer 4, and the part of the rolling element 5 extending to the outside of the bearing housing 1 is always in contact with the resolver shaft 8 for electrical connection.

[0027] Furthermore, a rolling support plate 6 is provided between the memory spring 3 and the rolling element 5. Under the action of the memory spring 3, the rolling support plate 6 always remains in close contact with the rolling element 5. A spring end cap 2 is fixedly assembled at the end of the bearing housing 1. The end of the memory spring 3 away from the rolling support plate 6 abuts against the spring end cap 2. By using the rolling support plate 6 to abut against the rolling element 5, the point-to-surface contact between the rolling support plate 6 and the rolling element 5 effectively reduces the frictional resistance when the rolling element 5 rolls. At the same time, the rolling support plate 6 supports the end of the memory spring 3, preventing the memory spring 3 from bending and deforming, which would affect the actual use effect.

[0028] The memory spring 3 is a cylindrical helical spring or a wave spring. The memory spring 3 can also be made of other elastic materials such as rubber. Its main function is to keep the part of the rolling element 5 extending to the outside of the bearing housing 1 in contact with the resolver shaft 8 for electrical connection. At the same time, the rolling element 5 is electrically connected to the retainer 4.

[0029] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0030] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A conductive bearing, characterized in that, The bearing housing includes a bearing housing (1) and a rolling element (5) disposed at one end of the bearing housing (1). One end of the rolling element (5) is exposed outside the bearing housing (1), and the other end of the rolling element (5) is provided with an elastic element. A retainer (4) is provided between the rolling element (5) and the bearing housing (1). The rolling element (5) is brought into contact with the retainer (4) through the elastic element, thereby making the rolling element (5) electrically connected to the bearing housing (1) through the retainer (4).

2. A conductive bearing according to claim 1, characterized in that, The rolling element (5) is spherical or cylindrical.

3. A conductive bearing according to claim 1, characterized in that, The surface of the rolling element (5) is provided with a conductive coating.

4. A conductive bearing according to claim 3, characterized in that, The conductive coating is silver.

5. A conductive bearing according to claim 1, characterized in that, The retainer (4) is made of conductive material.

6. A conductive bearing according to claim 1, characterized in that, The elastic element includes a memory spring (3) disposed in the bearing housing (1), and the extension and retraction direction of the memory spring (3) is opposite to that of the rolling element (5).

7. A conductive bearing according to claim 6, characterized in that, A rolling support plate (6) is provided between the memory spring (3) and the rolling body (5), and the rolling support plate (6) is always kept in close contact with the rolling body (5) under the action of the memory spring (3).

8. A conductive bearing according to claim 7, characterized in that, The bearing housing (1) is fixedly fitted with a spring end cap (2), and the end of the memory spring (3) away from the rolling support plate (6) abuts against the spring end cap (2).

9. A conductive bearing according to claim 6, characterized in that, The memory spring (3) is a cylindrical helical spring or a wave spring.

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