Bearing assembly, motor and vehicle

Abstract

The utility model relates to the technical field of motors, particularly provides a bearing assembly, a motor and a vehicle, and aims to solve the problems that bearing electrocorrosion cannot be avoided and the assembly process is complicated when a grounding ring is mounted on the motor in the prior art. In order to achieve the purpose, the bearing assembly comprises a bearing body, the bearing body comprises an inner ring and an outer ring, and the outer ring is arranged outside the inner ring in a sleeving mode; the conductive element is in contact connection with the inner ring and the outer ring respectively, the conductive element, the inner ring and the outer ring form a conductive path, and the resistance value of the conductive path is smaller than that of the bearing body. According to the bearing disclosed by the invention, the conductive elements which are respectively in contact connection with the inner ring and the outer ring are arranged, and the resistance value of the conductive path is smaller than that of the bearing body, so that the current passing through the bearing body is reduced, most shaft current is released through the conductive path, and the problem of electric corrosion of the bearing is effectively avoided; and independent installation with the rotating shaft, the shell and other structures is not needed, so that the assembly process is simplified.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and specifically provides a bearing assembly, a motor and a vehicle. Background Art

[0002] When the motor is running, a potential difference is generated between the two ends of the shaft or between the shaft and the bearing. When the potential difference rises to a certain value, it will break through the oil film and discharge, forming a path between the shaft, bearing, base and housing, thereby generating shaft current. When the shaft current passes through the bearing, local discharge generates high temperature, which causes electrical corrosion grooves to form on the inner ring, outer ring or rolling element of the bearing, thereby generating noise and abnormal sound. If it is not discovered and handled in time, it will lead to bearing failure or even motor damage. With the high speed and high voltage of the electric drive system of new energy vehicles, 800V high-voltage electric drive systems are widely used, and the electrical corrosion of bearings inside the motor is becoming more and more prominent.

[0003] In the prior art, since the conductivity of the bearing is weak or non-existent, conductive grease is injected into the bearing to reduce the generation of shaft voltage. However, in the high-voltage electric drive system, the conductive grease has limited effect on improving the conductivity of the bearing. A grounding ring is required to conduct the shaft current to the housing, thereby reducing the current passing through the bearing and protecting the bearing. However, the provision of a grounding ring cannot avoid the accumulation of capacitive charge on the bearing. When the capacitive charge accumulates too much, electrical corrosion of the bearing will still occur frequently. In addition, when installing the grounding ring, it is necessary to consider the clearance between the structural parts and the installation sequence, which makes the assembly process complicated. Utility Model Content

[0004] The utility model aims to solve the above technical problem, that is, to solve the problem in the prior art that the grounding ring installed on the motor cannot avoid electrical corrosion of the bearing and the assembly process is complicated.

[0005] In a first aspect, the utility model provides a bearing assembly, comprising: a bearing body, the bearing body comprising an inner ring and an outer ring, the outer ring being sleeved outside the inner ring; a conductive element, the conductive element being in contact and connected with the inner ring and the outer ring respectively, the conductive element, the inner ring and the outer ring forming a conductive path, the resistance value of the conductive path being less than the resistance value of the bearing body.

[0006] When the above technical solution is adopted, since when two paths with different resistance values ​​are connected in parallel, the current flowing through the path with smaller resistance value is greater than that flowing through the path with larger resistance value. Therefore, by providing a conductive element that is respectively in contact with the inner ring and the outer ring, and the resistance value of the conductive path is smaller than the resistance value of the bearing body, the current passing through the bearing body is reduced, and most of the shaft current is released through the conductive path, which not only reduces the generation of electrical corrosion, but also avoids the accumulation of more capacitive charges on the bearing, effectively avoiding the problem of electrical corrosion of the bearing. In addition, since the conductive element is connected to the bearing body, it does not need to be installed separately with structures such as the rotating shaft and the housing, which simplifies the assembly process.

[0007] In a specific embodiment of the above bearing assembly, the conductive element is disposed between the inner ring and the outer ring.

[0008] When the above technical solution is adopted, since the conductive element is arranged between the inner ring and the outer ring, the conductive element is closer to the bearing body than the grounding ring. Therefore, the capacitive charge accumulated on the bearing body can be released more quickly through the conductive element, which effectively avoids the problem of electrical corrosion of the bearing body caused by the accumulation of a large amount of capacitive charge on the bearing. In addition, the conductive element is arranged between the inner ring and the outer ring to avoid the occupation of additional space.

[0009] In a specific embodiment of the above-mentioned bearing assembly, the bearing body further comprises a sealing cover, the sealing cover is arranged between the inner ring and the outer ring, and the conductive element is arranged on the sealing cover.

[0010] When the above technical solution is adopted, the sealing cover is used to prevent dust or other impurities from entering the interior of the bearing, and the conductive element is arranged on the sealing cover without adding other structures, thereby simplifying the assembly process and reducing costs.

[0011] In a specific embodiment of the above bearing assembly, the conductive element is bonded to the outer side wall of the sealing cover.

[0012] When the above technical solution is adopted, the connection between the conductive element and the sealing cover is achieved by bonding, which is easy to operate and has low cost.

[0013] In a specific embodiment of the above-mentioned bearing assembly, a first mounting groove is provided on the inner wall of the outer ring, the first mounting groove is an annular mounting groove, part of the sealing cover is installed in the first mounting groove, and the conductive element is clamped between the sealing cover and the end face of the first mounting groove.

[0014] When the above technical solution is adopted, the conductive element is clamped between the sealing cover and the end surface of the first installation groove while the sealing cover is installed, without the need for additional operations, thus simplifying the operation and reducing the cost.

[0015] In a specific embodiment of the above bearing assembly, the conductive element is a conductive fiber element; and / or the conductive element is a conductive non-woven fabric.

[0016] When the above technical solution is adopted, the conductive fiber elements and the conductive non-woven fabrics have good conductive properties, and their fiber structure is conducive to charge dissipation, effectively avoiding the accumulation of more capacitive charges on the bearings. In addition, the conductive fiber elements and the conductive non-woven fabrics also have the characteristics of high temperature resistance, corrosion resistance, wear resistance, and light weight, which further improves the performance and service life of the conductive elements.

[0017] In a specific embodiment of the above bearing assembly, the surface of the conductive element is covered with a conductive plating layer.

[0018] When the above technical solution is adopted, by adding a conductive coating, the conductivity of the conductive element can be improved while the hardness of the conductive element can be increased, and the ability of the conductive element to destroy the oil film formed on the surface of the shaft can be improved. In addition, the corrosion resistance of the conductive element can also be improved.

[0019] In a specific embodiment of the above-mentioned bearing assembly, the conductive element is an annular structure; and / or the conductive element is provided in plurality, and the conductive elements are evenly distributed along the circumference of the bearing body.

[0020] When the above technical solution is adopted, when the conductive element is a ring structure, the conductive element is in contact with the inner ring and the outer ring throughout the entire circle, thereby improving the conductivity and effectively avoiding electrical corrosion of the bearing; when there are multiple conductive elements, they are evenly distributed along the circumference of the bearing body, which can evenly release the capacitive charge in all directions of the bearing through the conductive elements, effectively avoiding the problem of electrical corrosion of the bearing.

[0021] In a second aspect, the utility model further provides a motor, the motor comprising the bearing assembly; the motor further comprising a rotating shaft, the inner ring being sleeved outside the rotating shaft.

[0022] In a third aspect, the utility model further provides a vehicle, wherein the vehicle comprises the motor.

[0023] Compared with the prior art, the beneficial effect of the bearing assembly provided by the utility model is: when two paths with different resistance values ​​are connected in parallel, the current flowing through the path with smaller resistance value is greater than that flowing through the path with larger resistance value. Therefore, by providing a conductive element which is respectively in contact with the inner ring and the outer ring, and the resistance value of the conductive path is smaller than the resistance value of the bearing body, the current passing through the bearing body is reduced, and most of the shaft current is released through the conductive path, which not only reduces the generation of electrical corrosion, but also avoids the accumulation of more capacitive charges on the bearing, effectively avoiding the problem of electrical corrosion of the bearing. In addition, since the conductive element is connected to the bearing body, it does not need to be installed separately with structures such as the rotating shaft and the housing, which simplifies the assembly process. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0025] Figure 1 It is a schematic diagram of the overall structure of the bearing assembly of the utility model;

[0026] Figure 2 It is a schematic diagram of the axial cross-sectional structure of the bearing assembly of the utility model;

[0027] Figure 3 yes Figure 2 A partial enlarged structural schematic diagram of part A;

[0028] Figure 4 It is a schematic diagram of the exploded structure of the bearing assembly of the utility model.

[0029] Reference numerals:

[0030] 1-bearing body, 2-conductive element, 11-inner ring, 12-outer ring, 13-rolling element, 14-cage, 15-sealing cover, 121-first circumferential shoulder. DETAILED DESCRIPTION

[0031] Some embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not used to limit the scope of protection of the present invention. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0032] It should be noted that, in the description of the present utility model, the terms "center", "upper", "lower", "left", "right", "front", "back", "top", "bottom", "vertical", "horizontal", "inside", "outside" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are merely for the convenience of description, and do not indicate or imply that the relevant devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the ordinal numbers "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0033] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] Based on the problems in the prior art pointed out in the background technology, the utility model provides a bearing assembly, a motor and a vehicle, which aims to reduce the current passing through the bearing body by setting a conductive element that is respectively in contact with the inner ring and the outer ring, and the resistance value of the conductive path is less than the resistance value of the bearing body, so that most of the shaft current is released through the conductive path, which not only reduces the occurrence of electrical corrosion, but also avoids the accumulation of more capacitive charges on the bearing, effectively avoiding the problem of electrical corrosion of the bearing. In addition, since the conductive element is connected to the bearing body, it does not need to be installed separately with structures such as the rotating shaft and the housing, which simplifies the assembly process.

[0035] See also Figure 1-Figure 4 , Figure 1 The overall structure of the bearing assembly of the utility model is shown. Figure 2 The axial cross-sectional structure of the bearing assembly of the utility model is shown. Figure 3 Shows Figure 2 The A part of the local enlarged structure, Figure 4 The exploded structure of the bearing assembly of the utility model is shown. Figure 1-4As shown, the bearing assembly of the utility model includes a bearing body 1 and a conductive element 2. The bearing body 1 includes an inner ring 11, an outer ring 12, rolling elements 13, a retainer 14 and a sealing cover 15. The outer ring 12 is sleeved outside the inner ring 11; the rolling elements 13 are arranged between the outer ring 12 and the inner ring 11, and an annular raceway is arranged on the outer wall of the inner ring 11 and the inner wall of the outer ring 12. The rolling elements 13 roll in the raceway to ensure the relative automatic rotation of the outer ring 12 and the inner ring 11; the retainer 14 is used to maintain the relative position relationship of each rolling element 13 during the rolling process and the relative stability of the position in the bearing body 1; the sealing cover 15 is annular, and the sealing cover 15 is a ring-shaped seal. The cover 15 is arranged between the inner ring 11 and the outer ring 12 to prevent dust or other impurities from entering the bearing. Two sealing covers 15 are provided. Two first mounting grooves are provided on the inner wall of the outer ring 12. The two first mounting grooves are respectively arranged at the radial ends of the outer ring 12. The first mounting groove is an annular mounting groove. The inner side wall of the first mounting groove is the end face of the first mounting groove. The outer side of the first mounting groove is provided with a first circumferential shoulder 121. The first circumferential shoulder 121 is an annular shoulder and is arranged on the inner wall of the outer ring 12. Part of the sealing cover 15 is arranged between the end face of the first mounting groove and the first circumferential shoulder 121. The sealing cover 15 abuts against the end face of the first mounting groove. The inner side of the first mounting groove refers to the side of the first mounting groove close to the rolling element 13, and the outer side of the first mounting groove refers to the side of the first mounting groove away from the rolling element 13. The conductive element 2 is in contact with and connected to the inner ring 11 and the outer ring 12 respectively. The conductive element 2, the inner ring 11 and the outer ring 12 constitute a conductive path. The resistance value of the conductive path is less than the resistance value of the bearing body 1. When two paths with different resistance values ​​are connected in parallel, the current flowing through the path with a smaller resistance value is greater than that flowing through the path with a larger resistance value. Therefore, by providing a conductive element 2 that is in contact with and connected to the inner ring 11 and the outer ring 12 respectively, and the resistance value of the conductive path is less than the resistance value of the bearing body 1, the current passing through the bearing body 1 is reduced, and most of the shaft current is released through the conductive path, which not only reduces the generation of electrical corrosion, but also avoids the accumulation of a large amount of capacitive charge on the bearing, effectively avoiding the problem of electrical corrosion of the bearing. In addition, since the conductive element 2 is connected to the bearing body 1, it does not need to be installed separately with structures such as the rotating shaft and the housing, which simplifies the assembly process.

[0036] It will be appreciated by those skilled in the art that although the above Figure 1-4 It is described that the bearing body 1 includes a sealing cover 15, and two sealing covers 15 are provided. However, this is not restrictive. The bearing body 1 may not include the sealing cover 15. The number of the sealing cover 15 may be two or one, and the sealing cover 15 may be provided on any end surface of the outer ring 12. Figure 1What is described is that a first mounting groove is respectively provided at two radial ends of the inner wall of the outer ring 12, a first circumferential boss 121 is provided on the outer side of the first mounting groove, a portion of the sealing cover 15 is provided between the end face of the first mounting groove and the first circumferential boss 121, and the sealing cover 15 abuts against the end face of the first mounting groove, but this is not restrictive, two second mounting grooves may also be provided on the outer wall of the inner ring 11, the two second mounting grooves are respectively provided at two radial ends of the inner ring 12, the second mounting groove is an annular mounting groove, the inner side wall of the second mounting groove is the end face of the second mounting groove, a second circumferential boss is provided on the outer side of the second mounting groove, the second circumferential boss is an annular boss and is provided on the outer wall of the inner ring 11, a portion of the sealing cover 15 is provided between the end face of the second mounting groove and the second circumferential boss, and the sealing cover 15 abuts against the end face of the second mounting groove; wherein, the inner side of the second mounting groove refers to the side of the second mounting groove close to the rolling element 13, and the outer side of the second mounting groove refers to the side of the second mounting groove away from the rolling element 13. It should be noted that the second mounting groove and the first mounting groove may be provided at the same time, or only the first mounting groove or the second mounting groove may be provided, as long as the sealing cover 15 can be fixed.

[0037] Optionally, the conductive element 2 is arranged between the inner ring 11 and the outer ring 12. The conductive element 2 is closer to the bearing body 1 than the grounding ring. Therefore, the capacitive charge accumulated on the bearing body 1 can be released quickly through the conductive element 2, effectively avoiding the problem of electrical corrosion of the bearing body 1 caused by the accumulation of more capacitive charge on the bearing. In addition, the conductive element 2 is arranged between the inner ring 11 and the outer ring 12, which also avoids the occupation of additional space. Further, the conductive element 2 is arranged on the sealing cover 15. The conductive element 2 is arranged on the sealing cover 15 without adding other structures, which simplifies the assembly process and reduces the cost. Specifically, the conductive element 2 can be bonded to the outer wall of the sealing cover 15, and the conductive element 2 is connected to the sealing cover 15 by bonding, which is simple to operate and low in cost; the conductive element 2 can also be sandwiched between the sealing cover 15 and the end face of the first mounting groove. When the sealing cover 15 is installed, the conductive element 2 is sandwiched between the sealing cover 15 and the end face of the first mounting groove, without additional operations, which simplifies the operation and reduces the cost. Regarding the shape of the conductive element 2, the conductive element 2 can be an annular structure, which is integrally installed on the sealing cover 15. The conductive element 2 is in contact with the inner ring 11 and the outer ring 12 in a whole circle, which improves the conductivity and effectively avoids the electrical corrosion of the bearing. The conductive element 2 can also be an arc segment or a square or other structure. There are multiple conductive elements 2, which are evenly distributed along the circumference of the bearing body 1, which can evenly release the capacitive charge in all directions of the bearing through the conductive element 2, effectively avoiding the problem of electrical corrosion of the bearing.

[0038] It should be noted that the conductive element 2 may be provided on only one sealing cover 15 , or may be provided on both sealing covers 15 .

[0039] It can be understood by those skilled in the art that, although it is described above that the conductive element 2 is disposed on the sealing cover 15, this is not restrictive, and the conductive element 2 can also be directly connected to the inner wall of the outer ring 12, and slidably connected to the outer wall of the inner ring 11, and the conductive element 2 can also be directly connected to the outer wall of the inner ring 11, and slidably connected to the inner wall of the outer ring 12, as long as the conductive element 2 is disposed between the inner ring 11 and the outer ring 12; in addition, the conductive element 2 can also be directly connected to the side wall of the outer ring 12, and slidably connected to the side wall of the inner ring 11, and the conductive element 2 can also be directly connected to the side wall of the inner ring 11, and slidably connected to the side wall of the outer ring 12, as long as it can be achieved that when the inner ring 11 and the outer ring 12 of the bearing body 1 rotate relative to each other, the conductive element 2 can also be respectively contacted and connected with the inner ring 11 and the outer ring 12; the above adjustments do not deviate from the principle of the utility model and all belong to the protection scope of the utility model.

[0040] Optionally, the conductive element 2 can be a conductive fiber element or a conductive non-woven fabric; the conductive fiber element and the conductive non-woven fabric have good conductivity, and their fiber structure is conducive to charge dissipation, effectively avoiding the accumulation of more capacitive charges on the bearing. In addition, the conductive fiber element and the conductive non-woven fabric also have the characteristics of high temperature resistance, corrosion resistance, wear resistance, and light weight, further improving the performance and service life of the conductive element 2. Possibly, the conductive fiber can be a mixture of one or more of metal fiber, carbon black fiber, conductive metal compound fiber, and conductive polymer fiber.

[0041] Optionally, the surface of the conductive element 2 is covered with a conductive coating. By adding the conductive coating, the conductivity of the conductive element 2 can be improved, and the hardness of the conductive element 2 can be increased, and the ability of the conductive element 2 to destroy the oil film formed on the surface of the shaft can be improved. In addition, the conductive coating can also improve the corrosion resistance of the conductive element 2.

[0042] The vehicle of the utility model includes a motor, and the motor includes a rotating shaft, a bearing assembly and a housing. The bearing assembly and the rotating shaft are arranged in the housing, the inner ring is sleeved on the rotating shaft, and the outer ring is fixedly connected to the housing. When the motor is working, the rotor rotates to generate shaft voltage, and the shaft current is released through the passage formed by the rotating shaft, the inner ring, the conductive element, the outer ring, and the housing, thereby avoiding the shaft current passing through the inside of the bearing body and the electrical corrosion of the rolling element and the retaining frame, and also avoiding the electrical corrosion problem caused by the accumulation of capacitive charge on the bearing body. It should be noted that the bearing assembly can be applied to the motor or the generator, and the motor can be applied to the vehicle or other equipment driven by the motor, and the utility model does not make specific restrictions.

[0043] Optionally, when the conductive element is disposed on only one sealing cover, it can be disposed on the sealing cover on the bearing body close to the rotor side. Since it is closer to the location where the shaft current is generated, the shaft current can be released more quickly.

[0044] It should be noted that the above-mentioned implementation modes are only used to illustrate the principles of the present invention and are not intended to limit the protection scope of the present invention. Without departing from the principles of the present invention, those skilled in the art can adjust the above-mentioned implementation modes so that the present invention can be applied to more specific application scenarios.

[0045] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A bearing assembly, characterized in that: The bearing assembly comprises: A bearing body, the bearing body comprising an inner ring and an outer ring, the outer ring being sleeved outside the inner ring; A conductive element is in contact with and connected to the inner ring and the outer ring respectively. The conductive element, the inner ring and the outer ring form a conductive path. The resistance value of the conductive path is less than the resistance value of the bearing body.

2. The bearing assembly according to claim 1, characterized in that: The conductive element is arranged between the inner ring and the outer ring.

3. The bearing assembly according to claim 2, characterized in that: The bearing body further comprises a sealing cover, wherein the sealing cover is arranged between the inner ring and the outer ring, and the conductive element is arranged on the sealing cover.

4. The bearing assembly according to claim 3, characterized in that: The conductive element is bonded to the outer side wall of the sealing cover.

5. The bearing assembly according to claim 3, characterized in that: A first mounting groove is provided on the inner wall of the outer ring. The first mounting groove is an annular mounting groove. Part of the sealing cover is installed in the first mounting groove. The conductive element is clamped between the sealing cover and the end surface of the first mounting groove.

6. The bearing assembly according to claim 1, characterized in that The conductive element is a conductive fiber element; and / or The conductive element is a conductive non-woven fabric.

7. The bearing assembly according to claim 1, characterized in that The surface of the conductive element is covered with a conductive plating layer.

8. The bearing assembly according to claim 1, characterized in that The conductive element is a ring structure; and / or There are a plurality of conductive elements, and the conductive elements are evenly distributed along the circumference of the bearing body.

9. A motor, characterized in that: The motor comprises a bearing assembly as claimed in any one of claims 1 to 8; The motor also includes a rotating shaft, and the inner ring is sleeved outside the rotating shaft.

10. A vehicle, characterized in that: The vehicle comprises the electric machine as claimed in claim 9.

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