Insulating bearing of new energy electric drive system

Abstract

The utility model discloses a new energy electric drive system insulating bearing, and belongs to the field of bearings. Comprising a bearing body; the insulating part is arranged on the bearing body in a sleeving manner; the insulating part comprises a first fitting part and second fitting parts arranged at the two ends of the first fitting part; the first attaching part is attached to the outer wall of the outer ring of the bearing body, or attached to the inner wall of the inner ring of the bearing body, or attached to the inner wall of the inner ring and the outer wall of the outer ring of the bearing body; the second fitting part is fitted with flanges at two ends of the outer wall of the bearing body outer ring, or fitted with flanges at two ends of the inner wall of the bearing body inner ring, or fitted with flanges at two ends of the inner wall of the bearing body inner ring and flanges at two ends of the outer wall of the outer ring. The new energy electric drive system insulating bearing has the beneficial effect that the electric corrosion resistance is improved.

Description

Technical Field

[0001] The present application relates to the field of bearings, and more specifically, to an insulating bearing for a new energy electric drive system. Background Art

[0002] Rolling bearings are key components in mechanical equipment. Their main function is to support rotating bodies, reduce friction during movement, and ensure the rotation accuracy of equipment during operation. They play a vital role in the development of society and are the heart of mechanical equipment.

[0003] In the process of developing new energy vehicles, fields including batteries, electric drives, and power equipment are constantly upgraded, among which the development iteration of electric drives is particularly obvious. The four high developments of automotive electric drive systems (high voltage, high power, high frequency, and high speed) have compressed the living space of the bearing oil film's resistance to electrical corrosion in both directions: higher voltage platforms raise the shaft voltage, greater power makes the induction energy more, and high switching frequencies make the oil film more frequently attacked. In addition, the viscosity of the lubricating oil / grease that has been reduced to adapt to high speeds makes the oil film thinner and the bearing capacity worse. In the actual use of the market, the problem of electrical corrosion of bearings has been prominently exposed, resulting in a large number of abnormal noises from electric drives. Utility Model Content

[0004] The content of this application is used to introduce concepts in a brief form, which will be described in detail in the detailed implementation section below. The content of this application is not intended to identify the key features or essential features of the technical solution claimed for protection, nor is it intended to limit the scope of the technical solution claimed for protection.

[0005] In order to solve the technical problems mentioned in the above background technology section, some embodiments of the present application provide an insulating bearing of a new energy electric drive system, including:

[0006] Bearing body;

[0007] An insulating member, sleeved on the bearing body;

[0008] The insulating member includes a first bonding portion and second bonding portions provided at both ends of the first bonding portion;

[0009] The first fitting portion fits with the outer wall of the outer ring of the bearing body, or the first fitting portion fits with the inner wall of the inner ring of the bearing body, or the first fitting portion fits with the inner wall of the inner ring of the bearing body and the outer wall of the outer ring;

[0010] The second fitting portion fits with the two end flanges of the outer wall of the outer ring of the bearing body, or the second fitting portion fits with the two end flanges of the inner wall of the inner ring of the bearing body, or the second fitting portion fits with the two end flanges of the inner wall of the inner ring of the bearing body and the two end flanges of the outer wall of the outer ring.

[0011] The present application improves the ability to resist electrical corrosion through the action of insulating parts, so as to isolate the excessive shaft voltage occurring during electric drive operation from corroding the inside of the bearing and destroying the integrity of the rolling elements, inner ring grooves and outer ring groove surfaces inside the bearing.

[0012] Furthermore, the insulating member also includes an adhesive layer; the first bonding portion and the second bonding portion are connected to the bearing body through the adhesive layer.

[0013] Furthermore, the first bonding part and the second bonding part are made of aluminum alloy oxide film with a thickness of 10-20 um.

[0014] Furthermore, the bearing body includes a bearing inner ring with an inner ring groove and a bearing outer ring with an outer ring groove, rolling elements distributed between the inner ring groove and the outer ring groove, retainers separating the rolling elements, and seals symmetrically arranged between the inner ring groove and the outer ring groove.

[0015] Furthermore, a first dustproof groove is opened on the outer ring groove, a second dustproof groove is opened on the inner ring groove, one end of the seal is inserted into the first dustproof groove and has an interference fit with the first dustproof groove, and the other end is inserted into the second dustproof groove.

[0016] Further, the sealing element comprises:

[0017] A frame is disposed between the inner circle channel and the outer circle channel, and one end of the frame abuts against the side wall of the first dustproof groove;

[0018] A supporting part, fixed on the frame;

[0019] A connecting portion, fixedly connected to one end of the supporting portion, and an end surface of the connecting portion abuts against the first dustproof groove;

[0020] The convex block is fixedly arranged on the other end of the supporting part, and the convex block is located in the second dustproof groove.

[0021] Furthermore, one end of the convex block is composed of a plurality of protrusions, and there are gaps between adjacent protrusions.

[0022] Furthermore, the protrusion includes a first protrusion portion, a second protrusion portion, and a third protrusion portion; the first protrusion portion, the second protrusion portion, and the third protrusion portion are an integrally formed structure.

[0023] Furthermore, one end of the frame has a bending portion.

[0024] Furthermore, one end of the supporting portion has an inclined surface, and the inclined surface is located on one end of the connecting portion.

[0025] The beneficial effect of the present application is that it provides an insulating bearing for a new energy electric drive system that specifically improves the ability to resist electrical corrosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings constituting a part of this application are used to provide a further understanding of this application, so that other features, purposes and advantages of this application become more obvious. The illustrative embodiment drawings and their descriptions of this application are used to explain this application and do not constitute an improper limitation on this application.

[0027] In addition, throughout the drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and that the components and elements are not necessarily drawn to scale.

[0028] In the attached picture:

[0029] Figure 1 is an overall schematic diagram according to an embodiment of the present application;

[0030] Figure 2 yes Figure 1 A magnified view of part A;

[0031] Figure 3 This is an overall schematic diagram of other embodiments of the present application. Figure 1 ;

[0032] Figure 4 This is an overall schematic diagram of other embodiments of the present application. Figure 2 .

[0033] Reference numerals:

[0034] 1. Bearing outer ring; 2. Bearing inner ring; 3. Rolling element; 4. Retainer; 5. Insulator; 6. Sealing member; 7. First fitting portion; 8. Second fitting portion; 9. Adhesive layer; 10. Outer ring groove; 11. Inner ring groove; 12. First dustproof groove; 13. Second dustproof groove; 14. Skeleton; 15. Support portion; 16. Connecting portion; 17. Bump; 18. First raised portion; 19. Second raised portion; 20. Third raised portion; 21. Bending portion; 22. Inclined surface. DETAILED DESCRIPTION

[0035] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are only for exemplary purposes and are not intended to limit the scope of protection of the present disclosure.

[0036] It should also be noted that, for ease of description, only the parts related to the invention are shown in the drawings. In the absence of conflict, the embodiments and features in the embodiments of the present disclosure can be combined with each other.

[0037] It should be noted that the concepts such as "first" and "second" mentioned in the present disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0038] It should be noted that the modifications of "one" and "plurality" mentioned in the present disclosure are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0039] The present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0040] Reference Figure 1-4 , the insulating bearing of the new energy electric drive system includes a bearing body and an insulating member 5; the insulating member 5 is sleeved on the bearing body. Specifically, the insulating member 5 includes a first fitting portion 7 and a second fitting portion 8 provided on both ends of the first fitting portion 7; the first fitting portion 7 fits with the outer wall of the outer ring of the bearing body, and the second fitting portion 8 fits with the two end flanges of the outer wall of the outer ring of the bearing body. Among them, in other embodiments, the first fitting portion 7 fits with the inner wall of the inner ring of the bearing body, or fits with the inner wall of the inner ring of the bearing body and the outer wall of the outer ring; the second fitting portion 8 fits with the two end flanges of the inner wall of the inner ring of the bearing body, or fits with the two end flanges of the inner wall of the inner ring of the bearing body and the two end flanges of the outer wall of the outer ring. Through the action of the insulating member 5, the ability to resist electrical corrosion is improved to isolate the excessive shaft voltage in the electric drive operation from corroding the inner part of the bearing and damaging the integrity of the rolling element 3, the inner ring groove 11 and the outer ring groove 10 surface inside the bearing.

[0041] The insulating member 5 further includes an adhesive layer 9; the first bonding portion 7 and the second bonding portion 8 are connected to the bearing body through the adhesive layer 9. The first bonding portion 7 and the second bonding portion 8 are made of an aluminum alloy oxide film with a thickness of 10-20 um. The adhesive layer 9 is made of 1203T special strong glue, and the aluminum alloy oxide film is a prior art. Specific process: the first bonding part 7 and the second bonding part 8 adopt an aluminum alloy oxide layer. The aluminum alloy body with the aluminum alloy oxide layer is first machined, and then anodized. The processed aluminum profile body is immersed in a chemical solution and electrified to perform an electrochemical reaction to generate an inner oxide film. The inner oxide film thickness is guaranteed to be between 10-20um after grinding, the voltage resistance is guaranteed to be above 300 volts, the insulation resistance is greater than 11GΩ, and the surface microhardness is 38HRC, providing a highly wear-resistant surface, which is beneficial to subsequent grinding and installation of the finished bearing; the anodized first bonding part 7 and the second bonding part 8 are assembled with the bearing body through the adhesive layer 9, and the pressure is maintained for more than 60 seconds, so that the components are completely fitted together to play an insulating role and will not fall off during use.

[0042] The end face of the body composed of the bearing outer ring 1 or the bearing inner ring 2 and the first fitting part 7 and the second fitting part 8 is ground to meet the process requirements after grinding, the oxide film thickness is guaranteed to be between 10-20um, and the voltage resistance is guaranteed to be above 300 volts. The outer diameter surface of the bearing outer ring 1 is finely ground, the groove of the bearing outer ring 1 is finely ground, and the groove of the bearing outer ring 1 is finely ground; the groove of the bearing inner ring 2 is finely ground, and the inner ring groove 11 is finely ground, and the inner ring groove 11 is finely ground; then, rolling elements 3 (steel balls) of appropriate specifications and quantities are selected as required and loaded between the groove of the bearing outer ring 1 and the inner ring groove 11, and the retaining frame is filled, and appropriate grease and seals 6 are filled.

[0043] Through the above settings, the inner ring 2 of the bearing is well installed on the rotor shaft of the new energy electric drive system, and the outer ring 1 of the bearing is well matched with the electric drive end cover. When the electric drive system is working, when the operating conditions are good, the electric drive speed is relatively uniform, and the oil film reaches a certain thickness to bear the voltage on the bearing, the bearing is protected by the oil film and is not broken down, showing a complete common mode voltage waveform. However, due to the complex working conditions of the car, this situation will not last too long. Even if the voltage is not enough to break through the oil film, local discharge will still occur inside the oil film, slowly corroding the grease, and over time there will be a degradation process. The insulated bearing of the present application can cope with this well, ensuring the normal operation of the bearing and extending its life. When the electric drive works poorly, a waveform of capacitive breakdown discharge appears, and the thickness and strength of the oil film are not enough to withstand the component of the common-mode voltage on the bearing, so it will be broken down. A large current will be generated at the moment of breakdown, causing great damage to the bearing. The insulated bearing of the present application has excellent insulation, an insulation voltage of more than 300 volts, and can work for a long time at a high temperature of 150°C. It can effectively resist the high voltage generated by the electric drive system to protect the internal groove of the bearing and the surface of the rolling element 3 (steel ball), prevent the occurrence of electrical corrosion, extend the service life of the bearing, and effectively deal with the problem of abnormal noise caused by electrical corrosion of the electric drive. At the same time, it can also greatly reduce costs and help the rapid development of new energy electric drive systems.

[0044] The bearing body includes a bearing inner ring 2 with an inner ring groove 11 and a bearing outer ring 1 with an outer ring groove 10, rolling elements 3 distributed between the inner ring groove 11 and the outer ring groove 10, a retainer 4 separating the rolling elements 3, and a seal 6 symmetrically arranged between the inner ring groove 11 and the outer ring groove 10, and grease is filled between the bearing inner ring 2 and the bearing outer ring 1. Among them, a first dustproof groove 12 is provided on the outer ring groove 10, and a second dustproof groove 13 is provided on the inner ring groove 11. One end of the seal 6 is inserted into the first dustproof groove 12 and has an interference fit with the first dustproof groove 12, and the other end is inserted into the second dustproof groove 13.

[0045] The seal 6 includes a frame 14, a support portion 15, a connection portion 16, and a bump 17; the frame 14 is disposed between the inner ring channel 11 and the outer ring channel 10, and one end thereof abuts against the side wall of the first dustproof groove 12; the support portion 15 is fixedly disposed on the frame 14, the connection portion 16 is fixedly connected to one end of the support portion 15, and the end face of the connection portion 16 abuts against the first dustproof groove 12; the bump 17 is fixedly disposed on the other end of the support portion 15, and the bump 17 is located in the second dustproof groove 13. Through the action of the connection portion 16 and the bump 17, external pollutants such as water vapor are blocked out, preventing the bearing from being polluted by foreign matter and affecting the service life of the bearing.

[0046] One end of the protrusion 17 is composed of a plurality of protrusions, and there is a gap between adjacent protrusions. Specifically, the protrusions include a first protrusion 18, a second protrusion 19, and a third protrusion 20; the first protrusion 18, the second protrusion 19, and the third protrusion 20 are an integrally formed structure.

[0047] One end of the frame 14 has a bent portion 21. This improves the rigidity of the fixed fit between the seal 6 and the inner and outer rings, prevents the seal from falling off in situations with strong vibration, and ensures the stability of the seal.

[0048] One end of the support portion 15 has an inclined surface 22, and the inclined surface 22 is located on one end of the connecting portion 16. This is beneficial for guiding out foreign matter such as water vapor thrown away from the first dustproof groove 12, and further improving the sealing effect.

[0049] The above descriptions are only some preferred embodiments of the present disclosure and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the embodiments of the present disclosure is not limited to the technical solutions formed by a specific combination of the above-mentioned technical features, but should also cover other technical solutions formed by any combination of the above-mentioned technical features or their equivalent features without departing from the above-mentioned inventive concept. For example, the above-mentioned features are replaced with the technical features with similar functions disclosed in the embodiments of the present disclosure (but not limited to) and the technical solutions formed.

Claims

1. An insulating bearing for a new energy electric drive system, characterized in that: include: Bearing body; An insulating member, sleeved on the bearing body; The insulating member includes a first bonding portion and second bonding portions provided at both ends of the first bonding portion; The first fitting portion fits with the outer wall of the outer ring of the bearing body, or the first fitting portion fits with the inner wall of the inner ring of the bearing body, or the first fitting portion fits with the inner wall of the inner ring of the bearing body and the outer wall of the outer ring; The second fitting portion fits with the two end flanges of the outer wall of the outer ring of the bearing body, or the second fitting portion fits with the two end flanges of the inner wall of the inner ring of the bearing body, or the second fitting portion fits with the two end flanges of the inner wall of the inner ring of the bearing body and the two end flanges of the outer wall of the outer ring.

2. The insulating bearing of the new energy electric drive system according to claim 1 is characterized in that: The insulating member further includes an adhesive layer; the first fitting portion and the second fitting portion are connected to the bearing body via the adhesive layer.

3. The insulating bearing of the new energy electric drive system according to claim 1 is characterized in that: The first bonding part and the second bonding part are made of aluminum alloy oxide film with a thickness of 10-20 um.

4. The insulating bearing of the new energy electric drive system according to claim 1 is characterized in that: The bearing body includes a bearing inner ring with an inner ring groove and a bearing outer ring with an outer ring groove, rolling bodies distributed between the inner ring groove and the outer ring groove, retainers separating the rolling bodies, and seals symmetrically arranged between the inner ring groove and the outer ring groove.

5. The insulating bearing of the new energy electric drive system according to claim 4 is characterized in that: A first dustproof groove is formed on the outer ring groove, a second dustproof groove is formed on the inner ring groove, one end of the seal is inserted into the first dustproof groove and has an interference fit with the first dustproof groove, and the other end is inserted into the second dustproof groove.

6. The insulating bearing of the new energy electric drive system according to claim 5, characterized in that: The sealing member comprises: A frame, disposed between the inner ring channel and the outer ring channel, and having one end abutting against a side wall of the first dustproof groove; A support portion, fixedly disposed on the frame; A connecting portion, fixedly connected to one end of the supporting portion, and an end surface of the connecting portion abuts against the first dustproof groove; A convex block is fixedly arranged on the other end of the supporting portion, and the convex block is located in the second dustproof groove.

7. The insulating bearing of the new energy electric drive system according to claim 6, characterized in that: One end of the convex block is composed of a plurality of protrusions, and there are gaps between adjacent protrusions.

8. The insulating bearing of the new energy electric drive system according to claim 7 is characterized in that: The protrusion includes a first protrusion portion, a second protrusion portion, and a third protrusion portion; the first protrusion portion, the second protrusion portion, and the third protrusion portion are an integrally formed structure.

9. The insulating bearing of the new energy electric drive system according to claim 6, characterized in that: One end of the frame has a bending portion.

10. The insulating bearing of the new energy electric drive system according to claim 6, characterized in that: One end of the supporting portion has an inclined surface, and the inclined surface is located on one end of the connecting portion.

Images