Integrated conductive bearing structure

Abstract

The utility model discloses an integrated conductive bearing structure which comprises a sealing piece, a conductive assembly, a bearing outer ring, a rolling body, a retainer and a bearing inner ring, the bearing outer ring and the bearing inner ring are arranged in a nested mode, a gap exists between the bearing outer ring and the bearing inner ring, the rolling body is rotationally arranged in the gap and is subjected to auxiliary positioning through the retainer, and the sealing piece is arranged in the gap and located on the side portion of the rolling body. The sealing piece, the bearing outer ring and the bearing inner ring form a closed space, the conductive assembly is arranged in the closed space, the bearing outer ring is matched with an electric drive shell hole, and the bearing inner ring is matched with a transmission shaft. The bearing has the advantages of being compact in structure, convenient to install, good in corrosion resistance and the like, can be applied to a water-cooled motor structure and an oil-cooled motor, can avoid the influence of external impurities on the conductive assembly, and prolongs the service life of the bearing.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy automobile motors and electric automobile powertrains, and in particular to an integrated conductive bearing structure. Background Art

[0002] With the rapid development of new energy vehicles, the current operating voltage of vehicle platforms has increased from 400V to 800V, and it may be further increased to 1200V or even higher in the future. The resulting electrical corrosion of bearings is becoming increasingly serious. In order to avoid bearing failure due to electrical corrosion, the currently more recognized solutions are insulation solutions such as hybrid ceramic ball bearings and ring-coated insulating material bearings. However, the insulating bearing solution only solves the electrical corrosion problem of the bearing itself. The charge of the vehicle's electric drive system still exists in large quantities, and other components of the electric drive system are still threatened by shaft current or shaft voltage. At present, the industry has adopted the method of conductive rings, carbon brushes, and conductive oil seals to guide the release of charges on the motor shaft, but there are defects such as high prices, single application environment, and can only be applied to one of water-cooled motors and oil-cooled motors. In addition, in the actual application process of conductive rings or conductive oil seals, due to design factors, environmental factors, etc., the conductive elements are easily affected by impurities generated inside the motor, resulting in the reduction or loss of function of the conductive elements, frequent electrical corrosion of bearings, and greatly reduced service life of motor parts such as bearings. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide an integrated conductive bearing structure with compact structure, convenient installation and good corrosion resistance in view of the increasingly serious problem of electrical corrosion of bearings in the prior art.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0005] An integrated conductive bearing structure comprises: a seal, a conductive component, a bearing outer ring, a rolling body, a retaining frame and a bearing inner ring; the bearing outer ring and the bearing inner ring are nested and arranged, and there is a gap between the bearing outer ring and the bearing inner ring, the rolling body is rotatably arranged in the gap and is assisted in positioning by the retaining frame, the seal is arranged in the gap and is located on the side of the rolling body, the seal and the bearing outer ring and the bearing inner ring form a closed space, the conductive component is arranged in the closed space, the bearing outer ring cooperates with the electric drive housing hole, and the bearing inner ring cooperates with the transmission shaft.

[0006] As a further improvement of the present invention, the conductive component penetrates the side of the bearing outer ring and extends into the closed space, and the end of the conductive component is connected and matched with the outer side wall of the bearing inner ring.

[0007] As a further improvement of the present utility model, the conductive component includes a fixing sleeve and a conductive element. The fixing sleeve is fixedly penetrated through the side of the outer ring of the bearing and extends into the closed space. The conductive element is fixedly penetrated through the fixing sleeve, and the end of the conductive element is connected and matched with the outer side wall of the inner ring of the bearing.

[0008] As a further improvement of the present utility model, the fixing sleeve is riveted and fixed on the side of the outer ring of the bearing, and the conductive element is rotationally interference-fitted with the outer side wall of the inner ring of the bearing.

[0009] As a further improvement of the present utility model, the outer contour of the fixing sleeve is in a stepped structure. The fixing sleeve includes a swaging portion and a connecting surface. The connecting surface contacts the inner diameter groove of the outer ring of the bearing, and the swaging portion is fixed in the outer diameter surface groove of the outer ring of the bearing.

[0010] As a further improvement of the present utility model, the fixing sleeve is made of a metal material.

[0011] As a further improvement of the present utility model, the conductive element is made of carbon fiber or conductive non-woven fabric.

[0012] As a further improvement of the present utility model, the conductive component includes a spring and a conductive carbon rod. The spring is nested on the outer periphery of the conductive carbon rod. The conductive carbon rod is fixedly penetrated through the side of the outer ring of the bearing and extends into the closed space. The end of the conductive carbon rod contacts the outer side wall of the inner ring of the bearing.

[0013] As a further improvement of the present utility model, one end of the spring contacts the inner diameter surface groove of the outer ring of the bearing, and the other end of the spring contacts the stepped end surface of the conductive carbon rod. When the conductive bearing assembly is completed, the spring is in a compressed state.

[0014] As a further improvement of the present utility model, the seal is arranged on both sides of the conductive component. The seal is in interference contact with the outer ring and the inner ring of the bearing to form a closed space.

[0015] Compared with the prior art, the advantages of the present utility model are as follows:

[0016] The integrated conductive bearing structure of the present utility model sets a seal in the gap between the outer bearing ring and the inner bearing ring. The seal, the outer bearing ring, and the inner bearing ring form a closed space. A conductive component is arranged in the closed space. By using the conductive component to unload the shaft current inside the bearing to the outside of the bearing, the problem of bearing electro-corrosion can be effectively solved. At the same time, arranging the conductive component in the sealed space can not only prevent external lubricating oil and foreign impurities from invading and affecting the performance of the conductive component, but also avoid the adverse impact on the bearing caused by the wear and invasion of the conductive component. In addition, integrating the conductive component on the bearing and borrowing the high-precision machining of the inner and outer rings of the bearing can ensure that all conductive components in the circumferential direction can be in good contact during actual use, ensuring its good electrical conductivity, and also saving installation space and achieving convenient installation. The integrated conductive bearing structure of the present utility model can be applied in both water-cooled electric drive systems and oil-cooled electric drive systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structural principle of the integrated conductive bearing structure in Specific Embodiment 1 of the present utility model;

[0018] Figure 2 It is a schematic diagram of the sectional structural principle of the integrated conductive bearing structure in Specific Embodiment 1 of the present utility model;

[0019] Figure 3 It is a schematic diagram of the structural principle of the conductive component in Specific Embodiment 1 of the present utility model;

[0020] Figure 4 It is a schematic diagram of the structural principle of the fixing sleeve in Specific Embodiment 1 of the present utility model;

[0021] Figure 5 It is a schematic diagram of the sectional structural principle of the integrated conductive bearing structure in Specific Embodiment 2 of the present utility model;

[0022] Figure 6 It is a schematic diagram of the structural principle of the conductive component in Specific Embodiment 2 of the present utility model;

[0023] Legend Explanation: 10, seal; 20, conductive component; 201, fixing sleeve; 202, conductive element; 203, spring; 204, conductive carbon rod; 2011, swaging part; 2012, connection surface; 30, outer bearing ring; 40, rolling element; 50, cage; 60, inner bearing ring; 70, gap; 80, closed space. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following further describes the present utility model in conjunction with the accompanying drawings of the specification and specific preferred embodiments, but does not limit the protection scope of the present utility model thereby.

[0025] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "side part", "center", "longitudinal direction", "transverse direction", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial direction", "radial direction", "circumferential direction", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0026] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, the meaning of "a plurality" is two or more, unless otherwise clearly and specifically defined.

[0027] Embodiment 1

[0028] As Figures 1 to 4 shown, the integrated conductive bearing structure of the present utility model is applied in an environment with mechanical and electromagnetic coupling such as an electric drive assembly. Its structural components include: a seal 10, a conductive component 20, an outer bearing ring 30, rolling elements 40, a cage 50, and an inner bearing ring 60. The outer bearing ring 30 and the inner bearing ring 60 are nested, and there is a gap 70 between the outer bearing ring 30 and the inner bearing ring 60. The rolling elements 40 are rotatably arranged in the gap 70 and are assisted in positioning by the cage 50. The seal 10 is arranged in the gap 70 and is located on the side part of the rolling elements 40. The seal 10 and the cage 50 are respectively located on both sides of the rolling elements 40. The seal 10, the outer bearing ring 30, and the inner bearing ring 60 form a closed space 80, and the conductive component 20 is arranged in the closed space 80. The outer bearing ring 30 is in hole fit with the electric drive housing, and the inner bearing ring 60 is in fit with the transmission shaft. Shaft current (charge) unloading path: motor transmission shaft → inner bearing ring 60 → conductive component 20 → outer bearing ring 30 → motor housing. The conductive component 20 is arranged along the central axis of the bearing. According to actual requirements, the conductive component 20 can be circumferentially distributed on the bearing in multiple groups and multiple columns.

[0029] In this embodiment, by disposing the seal 10 within the gap 70 between the outer bearing ring 30 and the inner bearing ring 60, the seal 10, the outer bearing ring 30, and the inner bearing ring 60 form a closed space 80. The conductive component 20 is disposed within the closed space 80, and the shaft current within the bearing is discharged outside the bearing by means of the conductive component 20, effectively solving the problem of bearing electro-corrosion. At the same time, by disposing the conductive component 20 within the sealed space 80, it is possible to prevent external lubricating oil and foreign impurities from invading and affecting the performance of the conductive component 20, and it is also possible to prevent the conductive component 20 from wearing and invading and having an adverse effect on the bearing. In addition, by integrating the conductive component 20 onto the bearing and leveraging the high-precision machining of the inner and outer rings of the bearing itself, it is ensured that all the conductive components in the circumferential direction can make good contact during actual use, ensuring its good electrical conductivity, saving installation space, and achieving convenient installation. The integrated conductive bearing structure of this embodiment can be applied to both water-cooled electric drive systems and oil-cooled electric drive systems.

[0030] As Figure 2 shown, the conductive component 20 penetrates through the side of the outer bearing ring 30 and extends into the closed space 80, and the end of the conductive component 20 is connected and fitted with the outer side wall of the inner bearing ring 60. The seals 10 are symmetrically disposed on the left and right sides of the conductive component 20. The seals 10 are in interference contact with the outer bearing ring 30 and the inner bearing ring 60 to form the closed space 80, preventing external oil and impurities from entering and preventing the wear debris of the conductive component 20 from flowing out, improving the operating safety of the bearing.

[0031] As Figure 3 shown, the conductive component 20 includes a fixing sleeve 201 and a conductive element 202. The fixing sleeve 201 penetrates and is fixed to the side of the outer bearing ring 30 and extends into the closed space 80. The conductive element 202 penetrates and is fixed within the fixing sleeve 201, and the end of the conductive element 202 is connected and fitted with the outer side wall of the inner bearing ring 60.

[0032] Further, the fixing sleeve 201 is riveted and fixed to the side of the outer bearing ring 30, and the conductive element 202 is in rotational interference fit with the outer side wall of the inner bearing ring 60.

[0033] As Figure 4 shown, the outer contour of the fixing sleeve 201 has a stepped structure. The fixing sleeve 201 includes a swaging portion 2011 and a connection surface 2012. The connection surface 2012 contacts the inner diameter groove of the outer bearing ring 30, and the swaging portion 2011 is fixed within the outer diameter surface groove of the outer bearing ring 30, thus realizing that the conductive component 20 penetrates and is fixed to the side of the outer bearing ring 30. Further, the swaging portion 2011 is composed of multiple expansion pieces. When the conductive element 202 penetrates inside the fixing sleeve 201, the expansion pieces can improve the fitting stability between the conductive element 202 and the fixing sleeve 201.

[0034] In this embodiment, the fixing sleeve 201 functions to restrain the conductive element 202, and enables the conductive assembly 20 to be fixed to the outer ring 30 of the bearing by riveting. The conductive element 202 can be fixed to the fixing sleeve 201 by adhesion or by crimping the fixing sleeve 201.

[0035] In this embodiment, the fixing sleeve 201 is made of a metal material with good electrical conductivity and ductility, such as copper, silver, steel, aluminum, etc. The part of the fixing sleeve 201-1 can be not grooved or grooved with other numbers according to the ability of the spin riveting process to facilitate spin riveting. The conductive element 202 is made of a material with good electrical conductivity and wear resistance, such as carbon fiber or conductive non-woven fabric.

[0036] In this embodiment, according to the assembly or process requirements, the outer diameter surface of the outer ring 30 on the side of the conductive assembly 20 can have a different diameter from the side of the rolling element 40. Similarly, the inner diameter surface of the inner ring 60 on the side of the conductive assembly 20 can also have a different diameter from the side of the rolling element 40.

[0037] Embodiment 2

[0038] As Figure 5 and Figure 6 shown, the integrated conductive bearing structure of this embodiment has a similar structural arrangement and working principle to the integrated conductive bearing structure in Embodiment 1. The main difference lies in that the conductive assembly 20 includes a spring 203 and a conductive carbon rod 204. The spring 203 is nested on the outer periphery of the conductive carbon rod 204. The conductive carbon rod 204 is fixedly penetrated through the side part of the outer ring 30 of the bearing and extends into the closed space 80. The end of the conductive carbon rod 204 contacts the outer side wall of the inner ring 60 of the bearing.

[0039] As Figure 5 shown, one end of the spring 203 contacts the groove on the inner diameter surface of the outer ring 30 of the bearing, and the other end of the spring 203 contacts the stepped end surface of the conductive carbon rod 204. When the conductive bearing assembly is completed, the spring 203 is in a compressed state. The bottom end surface of the conductive carbon rod 202 contacts the outer diameter surface of the inner ring 60 of the bearing, and the cylindrical surface of the conductive carbon rod 202 has a clearance fit with the radial hole of the outer ring 30 of the bearing. During use, the conductive carbon rod 204 is allowed to move radially within the hole of the outer ring 30 of the bearing. When the conductive carbon rod 204 wears, the elastic force of the spring 203 causes the conductive carbon rod 204 to move radially, ensuring that the conductive carbon rod 204 always maintains good contact with the outer diameter surface of the inner ring 60 of the bearing.

[0040] The above are only the preferred embodiments of the present utility model, and the protection scope of the present utility model is not limited to the above embodiments. All technical solutions falling within the concept of the present utility model belong to the protection scope of the present utility model. It should be noted that for those of ordinary skill in the art, several improvements and refinements made without departing from the principle of the present utility model should also be regarded as within the protection scope of the present utility model.

Claims

1. An integrated conductive bearing structure, characterized in that, Including: A seal (10), a conductive component (20), an outer bearing ring (30), rolling elements (40), a cage (50), and an inner bearing ring (60); the outer bearing ring (30) and the inner bearing ring (60) are nested, and there is a gap (70) between the outer bearing ring (30) and the inner bearing ring (60). The rolling elements (40) are rotatably arranged in the gap (70) and are assisted in positioning by the cage (50). The seal (10) is arranged in the gap (70) and is located on the side of the rolling elements (40). The seal (10), the outer bearing ring (30), and the inner bearing ring (60) form a closed space (80). The conductive component (20) is arranged in the closed space (80). The outer bearing ring (30) is in hole fit with the electric drive housing, and the inner bearing ring (60) is in fit with the transmission shaft.

2. The integrated conductive bearing structure according to claim 1, wherein, The conductive component (20) penetrates through the side of the outer bearing ring (30) and extends into the closed space (80), and the end of the conductive component (20) is connected and fitted with the outer side wall of the inner bearing ring (60).

3. The integrated conductive bearing structure according to claim 2, wherein The conductive component (20) includes a fixing sleeve (201) and a conductive element (202). The fixing sleeve (201) penetrates and is fixed on the side of the outer bearing ring (30) and extends into the closed space (80). The conductive element (202) penetrates and is fixed in the fixing sleeve (201), and the end of the conductive element (202) is connected and fitted with the outer side wall of the inner bearing ring (60).

4. The integrated conductive bearing structure according to claim 3, wherein, The fixing sleeve (201) is riveted and fixed on the side of the outer bearing ring (30), and the conductive element (202) is in rotational interference fit with the outer side wall of the inner bearing ring (60).

5. The integrated conductive bearing structure according to claim 4, characterized in that The outer contour of the fixing sleeve (201) is in a stepped structure. The fixing sleeve (201) includes a swaging part (2011) and a connecting surface (2012). The connecting surface (2012) contacts the inner diameter groove of the outer bearing ring (30), and the swaging part (2011) is fixed in the outer diameter surface groove of the outer bearing ring (30).

6. The integrated conductive bearing structure according to claim 4, wherein The fixing sleeve (201) is made of a metal material.

7. The integrated conductive bearing structure according to claim 4, wherein, The conductive element (202) is made of carbon fiber or conductive non-woven fabric.

8. The integrated conductive bearing structure according to claim 2, wherein, The conductive component (20) includes a spring (203) and a conductive carbon rod (204). The spring (203) is nested on the outer periphery of the conductive carbon rod (204). The conductive carbon rod (204) penetrates and is fixed on the side of the outer bearing ring (30) and extends into the closed space (80), and the end of the conductive carbon rod (204) contacts the outer side wall of the inner bearing ring (60).

9. The integrated conductive bearing structure according to claim 8, wherein, One end of the spring (203) contacts the inner diameter surface groove of the outer bearing ring (30), and the other end of the spring (203) contacts the stepped end surface of the conductive carbon rod (204). When the conductive bearing assembly is completed, the spring (203) is in a compressed state.

10. The integrated conductive bearing structure according to any one of claims 1 to 9, characterized in that, The seal (10) is arranged on both sides of the conductive component (20). The seal (10) is in interference contact with the outer bearing ring (30) and the inner bearing ring (60) to form a closed space (80).

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