Motor bearing with insulating coating layer and manufacturing method thereof
By alternately arranging the first and second insulating areas on the outer ring of the motor bearing, the electric corrosion and creep problems in the background of high-pressure in new energy vehicles are solved, cost-effectiveness and performance optimization are achieved, and the overall reliability and life of the bearing are improved.
Patent Information
- Application Number
- CN202510630344.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-16
- Publication Date
- 2025-07-22
AI Technical Summary
Under the background of high-pressure new energy vehicles, motor bearings have problems with electrical corrosion and outer ring creep, and the existing solutions are costly or insufficient in performance, which limits their wide application.
An electric motor bearing is designed, with alternating first and second regions on the outer ring member, the first region coated with a first insulating layer to provide electrical insulation, and the second region coated with a second insulating layer contacts the bearing chamber after being heat-expanded, forming a heat transfer path, and satisfying the electrical corrosion and thermal management needs through the insulating material and coating process in different regions.
Effectively block the shaft current discharge path, reduce the risk of electrical corrosion, improve heat transfer efficiency, reduce creep phenomenon, improve bearing performance and reliability, reduce production costs, and meet the high-pressure requirements of new energy vehicles.
Smart Images
Figure CN120351250A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of automotive motor bearings, and particularly relates to a motor bearing with an insulating coating layer and a manufacturing method thereof. Background Art
[0002] With the gradual increase in the voltage platform of new energy vehicles, the problem of electric corrosion of motor bearings has become more prominent. Electric corrosion is caused by the shaft current generated during the operation of the motor discharging through the bearing, resulting in damage such as electric spark erosion pits and pitting on the bearing surface, thereby affecting the service life and reliability of the bearing. To solve this problem, relatively mature solutions in the industry include using ceramic ball bearings and slip rings. However, the costs of these solutions are relatively high, restricting their widespread application. In contrast, coating the conductive contact surface with an insulating material can significantly reduce costs, but currently, the performance of the insulating coating such as adhesion and wear resistance cannot meet the actual use requirements, restricting its widespread application in the field of new energy vehicles. In addition, the problem of outer ring creep of the bearing is also an important factor affecting the bearing performance.
[0003] Outer ring creep of the bearing refers to the phenomenon that the outer ring rotates slowly relative to the bearing housing when using a rolling bearing. This creep will cause wear of the outer ring or the housing, and the wear particles enter the bearing interior, resulting in a decline in the bearing quality. Even in the case of no clearance, the outer ring may creep due to elastic deformation and slip. The occurrence of creep is affected by various factors, including the fit clearance, the number of rolling elements, the wall thickness of the outer ring, temperature, and stress, etc.
[0004] Under the background of the high voltage of new energy vehicles, the current motor bearings cannot solve the influence of electric corrosion and outer ring creep on the bearing performance and life. Summary of the Invention
[0005] In view of the defects existing in the prior art, this application provides a motor bearing with an insulating coating layer and a manufacturing method thereof to solve the problem that the motor bearings in the prior art cannot take into account the influence of electric corrosion and outer ring creep on reliability.
[0006] The above object of this application is mainly achieved through the following technical solutions:
[0007] A motor bearing with an insulating coating layer, the motor bearing comprising:
[0008] An inner ring member;
[0009] Rolling elements, provided with a plurality of them, and arranged at intervals along the circumferential direction on the outer peripheral surface of the inner ring member;
[0010] An outer ring member, coaxially arranged with the inner ring member, the outer ring member is sleeved outside the inner ring member and the rolling elements. The outer ring member is provided with a plurality of first regions and a plurality of second regions, the first regions and the second regions are arranged alternately along the circumferential direction on the outer peripheral surface of the inner ring member. The first regions are provided with a first insulating layer, the second regions are provided with a second insulating layer, and the second insulating layer can contact the bearing housing after thermal expansion, so that the second insulating layer forms a heat transfer path between the outer ring member and the bearing housing.
[0011] In an alternative embodiment, the first insulating layer is formed by spraying an insulating material.
[0012] In an alternative embodiment, the thickness of the first insulating layer is 50 to 100 microns.
[0013] In an alternative embodiment, the electrical strength of the first insulating layer is not less than 2 kV / mm.
[0014] In an alternative embodiment, the first insulating layer is made of one or more of polyetheretherketone, polyimide, and polyamide-imide.
[0015] In an alternative embodiment, the second regions are provided with grooves extending along the axial direction of the outer ring member, and the second insulating layer is arranged in the grooves.
[0016] In an alternative embodiment, the thickness of the second insulating layer is greater than the thickness of the first insulating layer, and the outer sidewall of the second insulating layer is at the same height as that of the first insulating layer.
[0017] In an alternative embodiment, the coefficient of thermal expansion of the second insulating layer is not less than 30×10 -6 ℃ -1 .
[0018] In an alternative embodiment, the ratio of the width of the second insulating layer to the thickness of the second insulating layer is greater than 2.
[0019] Based on the same inventive concept, the present application also provides a manufacturing method for a motor bearing. The manufacturing method is applied to the manufacturing of the motor bearing as described above. The manufacturing method includes:
[0020] Take the outer ring member of the bearing member, and process a plurality of grooves arranged at intervals on the outer peripheral surface of the outer ring member. The grooves form the second regions, and the unprocessed regions on the outer ring member form the first regions;
[0021] After cleaning the outer ring member, dry the outer ring member;
[0022] After laser treatment in the first region, an insulating material is sprayed in the first region to form a first insulating layer;
[0023] Preheat the outer ring at a preheating temperature of 80 - 100 °C;
[0024] Injection mold a second insulating layer in the second region of the outer ring;
[0025] After cooling the outer ring, perform surface treatment and cleaning;
[0026] Assemble the inner ring, rolling elements, and the outer ring to obtain a motor bearing.
[0027] Compared with the prior art, the advantages of the present application are as follows:
[0028] The motor bearing with an insulating coating layer in the present application includes an inner ring, rolling elements, and an outer ring. There are multiple rolling elements, which are arranged at intervals along the circumferential direction on the outer peripheral surface of the inner ring; the outer ring is coaxially arranged with the inner ring, and the outer ring is sleeved outside the inner ring and the rolling elements. There are multiple first regions and multiple second regions on the outer ring. The first regions and the second regions are arranged alternately along the circumferential direction on the outer peripheral surface of the inner ring. A first insulating layer is provided on the first region, and a second insulating layer is provided on the second region. And the second insulating layer can contact the bearing housing after thermal expansion, so that the second insulating layer forms a heat transfer path between the outer ring and the bearing housing.
[0029] Under the background of the high - voltage trend in new energy vehicles, the problems of electric corrosion and outer - ring creep of motor bearings have a significant impact on the performance and life of the bearings. The regional insulation of the first insulating layer and the second insulating layer can effectively block the path of shaft current discharging through the outer ring of the bearing, thus significantly reducing the risk of electric corrosion of the motor bearing. Compared with the traditional full - arc - surface spraying of insulating materials, this motor bearing can not only meet the requirements of electric - corrosion protection, but also improve the material utilization rate and reduce production costs. The method of using insulating material coating has a lower cost compared with traditional solutions such as ceramic - ball bearings and conductive rings. Especially in large - scale production, it can significantly reduce the manufacturing cost and improve the market competitiveness of the product.
[0030] The second insulating layer contacts the bearing housing after thermal expansion to form a heat transfer path, which can effectively improve the heat transfer efficiency between the outer ring of the bearing and the bearing housing. It can avoid the problem of outer - ring creep caused by excessive temperature. Through reasonable thermal management, the thermal expansion of the outer ring can be reduced, and the creep risk can be lowered, thereby extending the service life of the bearing. Compared with the traditional methods of increasing the outer - ring wall thickness or using special designs, this method optimized through the thermal - expansion characteristics is more economical and efficient, and does not increase the weight and complexity of the bearing.
[0031] By setting the first insulating layer and the second insulating layer in different regions, different insulating materials and coating processes can be selected according to the usage requirements of different regions. For example, the second insulating layer in the second region can adopt materials with higher wear resistance and adhesion to meet the requirements of thermal expansion and heat transfer, while ensuring the stability and reliability of the coating. It can not only effectively solve the problem of electrocorrosion, but also improve the thermal management performance of the bearing, reduce the creep phenomenon, significantly enhance the overall performance and reliability of the motor bearing, and meet the high requirements under the background of high voltage in new energy vehicles. Compared with traditional solutions, this motor bearing has higher cost-effectiveness, better performance optimization and higher reliability, providing strong support for the industry to reduce costs and improve product reliability. BRIEF DESCRIPTION OF THE DRAWINGS
[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0033] Figure 1 Structural schematic diagram of the motor bearing provided by the embodiment of the present application;
[0034] Figure 2 Partial cross-sectional view at the second insulating layer provided by the embodiment of the present application;
[0035] Figure 3 Partial cross-sectional view when the second insulating layer expands provided by the embodiment of the present application;
[0036] Figure 4 Flow chart of the manufacturing method provided by the embodiment of the present application;
[0037] In the figure: 100, inner ring part; 200, rolling element; 300, outer ring part; 401, first insulating layer; 402, second insulating layer; 500, bearing housing. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0038] The following further elaborates the present invention in conjunction with the drawings and specific embodiments. It should be noted here that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation to the present invention. The specific structural and functional details disclosed herein are only used to describe the exemplary embodiments of the present invention. However, the present invention can be embodied in many alternative forms and should not be construed as being limited to the embodiments described herein.
[0039] With the gradual high-voltage trend of the voltage platform of new energy vehicles, the problem of electric corrosion of motor bearings has become increasingly prominent. Electric corrosion is caused by the shaft current generated during the operation of the motor discharging through the bearing, resulting in damage such as electric spark erosion pits and pitting on the bearing surface, which in turn affects the service life and reliability of the bearing. To solve this problem, relatively mature solutions in the industry include using ceramic ball bearings and slip rings. However, the cost of these solutions is relatively high, restricting their widespread application. In contrast, coating the conductive contact surface with insulating materials can significantly reduce costs, but currently, the performance of insulating coatings such as adhesion and wear resistance cannot meet the actual usage requirements, limiting their widespread application in the field of new energy vehicles. The problem of outer ring creep of the bearing is also an important factor affecting bearing performance, and solutions need to be comprehensively considered.
[0040] Outer ring creep of the bearing refers to the phenomenon that the outer ring rotates slowly relative to the bearing housing when using a rolling bearing. This creep will cause wear of the outer ring or the housing, and the wear particles enter the bearing interior, resulting in a decrease in bearing quality. Creep phenomena are generally divided into two types: reverse rotation creep and same rotation creep. Reverse rotation creep usually occurs when there is a gap between the outer ring of the bearing and the bearing housing. When a rotational load acts on the bearing, the outer ring will slide relative to the housing, and the sliding direction is usually opposite to the rotational direction of the inner ring. Even in the case of no gap, the outer ring may also creep due to elastic deformation and slip. Same rotation creep is due to the local strain and wavy deformation caused by the rolling elements during rolling. Each passage of the rolling elements will cause local stretching and contraction of the outer ring surface. This strain change forms a progressive wave in the movement direction of the rolling elements, resulting in creep of the outer ring in the same direction as the inner ring.
[0041] The occurrence of creep is affected by various factors, including the fit clearance, the number of rolling elements, the wall thickness of the outer ring, temperature, and stress, etc. When the fit clearance decreases, the creep torque decreases, and it becomes difficult for creep to occur. Increasing the number of rolling elements will make the load on the rolling elements smaller, thereby suppressing the local deformation of the outer ring. Increasing the wall thickness of the outer ring can improve the rigidity of the outer ring, thereby suppressing the occurrence of creep. In addition, both increasing temperature and stress will lead to an increase in the steady-state creep rate. Creep will cause a change in the shape of the bearing outer ring, causing the bearing to lose its original geometry, thereby affecting the running accuracy and stability of the bearing. In addition, creep will also increase the friction and wear of the bearing outer ring, resulting in a shortened bearing life. In the initial stage of creep, although the temperature inside the bearing does not rise sharply, when the creep amount gradually increases and the inner ring enters the rotating state, there may be a phenomenon of burning.
[0042] As Figure 1 、 Figure 2 shown, Figure 1 is a schematic structural diagram of the motor bearing provided by the embodiment of the present application; Figure 2Partial cross-sectional view of the second insulating layer provided by the embodiments of the present application; A motor bearing with an insulating coating layer is provided to solve the problems of electrical corrosion and outer ring creep of the motor bearing under the background of high-voltage of new energy vehicles, while optimizing the thermal management performance of the bearing, improving its reliability and service life. The motor bearing includes an inner ring member 100, rolling elements 200, and an outer ring member 300, where:
[0043] As Figure 1 , Figure 2 shown, the inner ring member 100 is directly connected to the motor shaft and bears the rotational torque from the motor shaft. The inner ring member 100 is usually made of high-strength steel to ensure its stability and durability under high-speed and high-load conditions.
[0044] As Figure 1 , Figure 2 shown, a plurality of rolling elements 200 are provided and arranged at intervals in the circumferential direction on the outer peripheral surface of the inner ring member 100. The rolling elements 200 are used to transmit loads between the inner ring member 100 and the outer ring member 300 and reduce friction. The rolling elements 200 usually adopt high-precision rolling bodies, such as steel balls or rollers, which roll between the inner ring member 100 and the outer ring member 300, thereby realizing low-friction and high-efficiency rotational motion. The arrangement mode and quantity of the rolling elements 200 are optimized according to the specific application scenarios and design requirements of the motor bearing to ensure that the bearing has good load-bearing capacity and stability during operation.
[0045] As Figure 1 , Figure 2 shown, the outer ring member 300 is coaxially arranged with the inner ring member 100, the outer ring member 300 is sleeved outside the inner ring member 100 and the rolling elements 200, a plurality of first regions and a plurality of second regions are provided on the outer ring member 300, the first regions and the second regions are arranged alternately in the circumferential direction on the outer peripheral surface of the inner ring member 100, a first insulating layer 401 is provided on the first regions, a second insulating layer 402 is provided on the second regions, and the second insulating layer 402 can contact the bearing housing 500 after thermal expansion, so that the second insulating layer 402 forms a heat transfer path between the outer ring member 300 and the bearing housing 500.
[0046] The outer ring member 300 is coaxially arranged with the inner ring member 100 and is sleeved outside the inner ring member 100 and the rolling elements 200. The main function of the outer ring member 300 is to provide support for the rolling elements 200 and cooperate with the bearing housing 500 (such as the motor housing) to transfer the load to the support structure of the motor.
[0047] As Figure 1 , Figure 2As shown, the outer ring member 300 is provided with a plurality of first regions and a plurality of second regions, and the first regions and the second regions are arranged alternately in the circumferential direction in turn, so that the outer ring member 300 has different functions and performance characteristics in different regions.
[0048] A first insulating layer 401 is provided on the first region. The main function of the first insulating layer 401 is to provide electrical insulation performance, prevent the shaft current from discharging through the outer ring member 300, and thus effectively reduce the risk of electrical corrosion. The first insulating layer 401 usually adopts a high-performance insulating material, which not only has excellent insulating performance, but also has good mechanical properties and high-temperature resistance, and can meet the strict requirements under the background of the high-voltage of new energy vehicles.
[0049] As Figure 2 、 Figure 3 shown, Figure 3 This is a partial cross-sectional view of the second insulating layer expanding in the embodiment of the present application; a second insulating layer 402 is provided on the second region. The second insulating layer 402 not only has insulating performance, but also has unique thermal expansion characteristics. At normal temperature, the outer ring member 300 and the bearing housing 500 will maintain good contact and fitting accuracy. However, as the ambient temperature increases, a gap appears between the outer ring member 300 and the bearing housing 500. This gap will lead to a decrease in the fitting accuracy and at the same time cause a decrease in the heat transfer performance of the bearing. Through the thermal expansion characteristics of the second insulating layer, the fitting accuracy of the bearing can be maintained and the heat transfer performance can be improved. However, when the temperature rises, the second insulating layer 402 will expand due to heat and contact the bearing housing 500. This makes the second insulating layer 402 form a heat transfer path between the outer ring member 300 and the bearing housing 500, effectively improving the thermal management performance of the bearing.
[0050] As Figure 2 、 Figure 3 shown, through the thermal expansion characteristics of the second insulating layer 402, the second insulating layer 402 can transfer heat from the outer ring member 300 to the bearing housing 500 when the temperature rises, thereby avoiding quality problems caused by local overheating. This thermal management mechanism not only improves the service life of the bearing, but also reduces the risk of bearing failure caused by uneven thermal expansion.
[0051] In an alternative embodiment, the motor bearing of the present application having an insulating coating layer, the working principle of the motor bearing is as follows: The motor bearing includes an inner ring member 100, rolling elements 200, and an outer ring member 300. A plurality of rolling elements 200 are provided and arranged at intervals in the circumferential direction on the outer circumferential surface of the inner ring member 100; the outer ring member 300 is coaxially arranged with the inner ring member 100, and the outer ring member 300 is sleeved on the outer sides of the inner ring member 100 and the rolling elements 200. A plurality of first regions and a plurality of second regions are provided on the outer ring member 300. The first regions and the second regions are alternately arranged in the circumferential direction on the outer circumferential surface of the inner ring member 100. A first insulating layer 401 is provided on the first regions, and a second insulating layer 402 is provided on the second regions. And the second insulating layer 402 can contact the bearing housing 500 after thermal expansion, so that the second insulating layer 402 forms a heat transfer path between the outer ring member 300 and the bearing housing 500.
[0052] Under the background of the high-voltage trend in new energy vehicles, the problems of electric corrosion and outer ring creep of motor bearings have a significant impact on the performance and service life of the bearings. The regional insulation of the first insulating layer 401 and the second insulating layer 402 can effectively block the path of shaft current discharging through the outer ring of the bearing, thereby significantly reducing the risk of electric corrosion of the motor bearing. Compared with the traditional full-arc surface spraying of insulating materials, this motor bearing can not only meet the requirements of electric corrosion protection, but also improve the material utilization rate and reduce the production cost. The method of coating with insulating materials has a lower cost compared with traditional solutions such as ceramic ball bearings and conductive rings. Especially in large-scale production, it can significantly reduce the manufacturing cost and improve the market competitiveness of the product.
[0053] The second insulating layer 402 contacts the bearing housing 500 after thermal expansion to form a heat transfer path, which can effectively improve the heat transfer efficiency between the outer ring of the bearing and the bearing housing 500. It is possible to avoid bearing quality problems caused by excessive temperature. Through reasonable thermal management, the thermal expansion of the outer ring can be reduced, the risk of bearing failure can be lowered, and thus the service life of the bearing can be extended. Compared with the traditional methods of increasing the wall thickness of the outer ring or adopting special designs, this method optimized by the thermal expansion characteristics is more economical and efficient, and does not increase the weight and complexity of the bearing.
[0054] The second insulating layer 402 can be configured as an insulating material with high thermal conductivity such as epoxy resin.
[0055] By setting the first insulating layer 401 and the second insulating layer 402 in different regions, different insulating materials and coating processes can be selected according to the usage requirements of different regions. For example, the second insulating layer 402 in the second region can adopt materials with higher wear resistance and adhesion to meet the requirements of thermal expansion and heat transfer, while ensuring the stability and reliability of the coating. It can not only effectively solve the problem of electro-corrosion, but also improve the thermal management performance of the bearing, reduce the creep phenomenon, significantly enhance the overall performance and reliability of the motor bearing, and meet the high requirements under the background of high voltage in new energy vehicles. Compared with traditional solutions, this motor bearing has higher cost-effectiveness, better performance optimization and higher reliability, providing strong support for the industry to reduce costs and improve product reliability.
[0056] In an alternative embodiment, the first insulating layer 401 is formed by spraying an insulating material. The spraying process can ensure that the insulating layer evenly covers the first region of the outer ring member 300, forming a continuous and dense coating. The spraying operation not only improves the production efficiency, but also can accurately control the thickness and uniformity of the coating according to actual needs.
[0057] In an alternative embodiment, the thickness of the first insulating layer 401 is 50 to 100 micrometers. This thickness range can not only ensure sufficient insulation performance, but also not increase additional weight and cost due to excessive thickness. By controlling the coating thickness, the stable operation of the motor bearing in a high-voltage environment can be ensured, while optimizing the material usage efficiency.
[0058] In an alternative embodiment, the electrical strength of the first insulating layer 401 is not less than 2 kV / mm. This electrical strength index is a key parameter for measuring the insulation performance of the insulating layer under high voltage. High electrical strength means that the insulating layer can effectively prevent the shaft current from discharging through the bearing under the background of high voltage in new energy vehicles, thus significantly reducing the risk of electro-corrosion and extending the service life of the bearing.
[0059] In an alternative embodiment, the first insulating layer 401 is made of one or more of polyetheretherketone, polyimide, and polyamide-imide. These materials have excellent insulation performance, mechanical performance and high-temperature resistance, and can meet the usage requirements of new energy vehicle motor bearings under complex working conditions such as high voltage and high temperature. By selecting suitable materials, the performance of the insulating layer can be further optimized to make it perform well in different application scenarios.
[0060] Such as Figure 2 、 Figure 3As shown, in an alternative embodiment, a groove extending axially along the outer ring member 300 is provided on the second region, and the second insulating layer 402 is disposed within the groove. This enables the second insulating layer 402 to come into contact with the bearing housing 500 after thermal expansion, forming a heat transfer path. The provision of the groove not only provides stable support for the second insulating layer 402 but also ensures that the second insulating layer 402 can form good contact with the bearing housing 500 during thermal expansion, thereby effectively improving the thermal management performance of the bearing.
[0061] It should be noted that the axial cross-sectional shape of the groove can be configured as square, circular, or other irregular shapes; to avoid resonance between the second insulating layer 402 and the rolling elements 200 under complex dynamic conditions, when configuring the number of grooves, the number of grooves is maintained as a non-integer multiple of the rolling elements 200; the depth of the groove is maintained at not less than 1 mm, and at the same time, the depth of the groove is not greater than half of the thickness of the outer ring member 300.
[0062] Furthermore, the groove can also be configured to extend in a spiral direction or an oblique direction, more effectively guiding heat to transfer from the inside of the bearing to the outside, avoiding heat accumulation, further optimizing the thermal management performance, reducing local stress concentration, and enabling flexible adjustment of the heat conduction path according to the heat source distribution and heat flow direction in different directions, thereby further enhancing the performance and reliability of the bearing and meeting the requirements of different application scenarios.
[0063] In an alternative embodiment, the thickness of the second insulating layer 402 is greater than the thickness of the first insulating layer 401, and the outer sidewalls of the second insulating layer 402 and the first insulating layer 401 are at the same height. This enables the second insulating layer 402 to come into better contact with the bearing housing 500 after thermal expansion while maintaining the overall appearance and dimensional consistency of the outer ring member 300. By optimizing the thickness of the second insulating layer 402, it can be ensured that the second insulating layer 402 has sufficient space and ability to form an effective heat transfer path with the bearing housing 500 during thermal expansion, thereby reducing the risk of outer ring creep.
[0064] In an alternative embodiment, the coefficient of thermal expansion of the second insulating layer 402 is not less than 30×10 -6 °C -1 . This ensures that the second insulating layer 402 can effectively expand and come into contact with the bearing housing 500 when the temperature rises, thereby forming a heat transfer path. The high coefficient of thermal expansion enables the second insulating layer 402 to respond quickly to temperature changes, ensuring that the thermal management performance of the bearing is optimized and reducing the problem of outer ring creep caused by local overheating.
[0065] In an alternative embodiment, the ratio of the width to the thickness of the second insulating layer 402 is greater than 2. This ensures that when the second insulating layer 402 expands due to heat, it can uniformly contact the bearing housing 500, forming a stable heat transfer path. By optimizing the ratio of the width to the thickness of the second insulating layer 402, its thermal management performance and reliability can be further improved, ensuring the stable operation of the motor bearing in a high-temperature environment. It should be noted that the length direction of the second insulating layer 402 is parallel to the axis direction of the outer ring member 300, and the width direction of the second insulating layer 402 is perpendicular to the length direction of the second insulating layer 402.
[0066] As Figure 4 shown, Figure 4 FIG. is a flowchart of the manufacturing method provided by the embodiment of the present application. Based on the same inventive concept, the present application also provides a manufacturing method for a motor bearing. The manufacturing method is applied to the manufacturing of the motor bearing as described above. The manufacturing method includes:
[0067] Take the outer ring member 300 on the bearing member, and process a plurality of grooves arranged at intervals on the outer peripheral surface of the outer ring member 300. The grooves form the second region, and the unprocessed region on the outer ring member 300 forms the first region;
[0068] After cleaning the outer ring member 300, dry the outer ring member 300;
[0069] After performing laser treatment on the first region, spray an insulating material in the first region to form the first insulating layer 401;
[0070] Preheat the outer ring member 300 at a preheating temperature of 80 - 100 °C;
[0071] Inject and form the second insulating layer 402 in the second region of the outer ring member 300;
[0072] After cooling the outer ring member 300, perform surface treatment and cleaning;
[0073] Assemble the inner ring member 100, the rolling elements 200, and the outer ring member 300 to obtain the motor bearing.
[0074] During actual operation, take the outer ring member 300 on the bearing member. On the outer peripheral surface of the outer ring member 300, process a plurality of grooves arranged at intervals along the circumferential direction. These grooves will form the second region of the motor bearing, while the unprocessed region on the outer ring member 300 forms the first region. By precisely processing the grooves, a basic structure is provided for the subsequent coating of the insulating layer and the realization of the thermal management function.
[0075] After the processing is completed, the outer ring part 300 is cleaned to remove impurities, oil stains and processing residues on the surface. After cleaning, the outer ring part 300 is dried to ensure that the surface of the outer ring part 300 is dry and clean. This step is crucial for the adhesion of the subsequent insulating layer and the coating quality, and can effectively avoid coating defects caused by surface contamination.
[0076] Laser treatment is carried out in the first region. Laser treatment can improve the microstructure of the surface of the outer ring part 300, increase the surface roughness, and thus enhance the adhesion of the insulating material. After the treatment is completed, an insulating material is sprayed in the first region to form a first insulating layer 401. The spraying process can ensure that the insulating layer evenly covers the first region and forms a continuous and dense coating. The main function of the first insulating layer 401 is to provide electrical insulation performance, prevent the shaft current from discharging through the outer ring part 300, and thus effectively reduce the risk of electrocorrosion.
[0077] The outer ring part 300 is preheated at a preheating temperature of 90 °C. The preheating step can ensure that the outer ring part 300 is evenly heated during the subsequent injection molding process, and avoid coating defects or deformation of the outer ring part 300 caused by temperature differences. The selection of the preheating temperature can ensure the stability of the outer ring part 300 without damaging the insulating layer.
[0078] A second insulating layer 402 is injection molded in the second region of the outer ring part 300. The injection molding process can ensure that the second insulating layer 402 is precisely filled in the groove to form a uniform second insulating layer 402. The second insulating layer 402 not only has insulating properties but also has unique thermal expansion characteristics. At normal operating temperatures, there is a certain gap between the second insulating layer 402 and the bearing housing 500 to ensure the free rotation of the bearing and good thermal management. However, when the temperature rises, the second insulating layer 402 will expand due to heat and contact the bearing housing 500, thus forming a heat transfer path between the outer ring part 300 and the bearing housing 500.
[0079] After the injection molding is completed, the outer ring part 300 is cooled. During the cooling process, the second insulating layer 402 gradually solidifies and its stability is improved. After the cooling is completed, surface treatment and cleaning are carried out to ensure the smoothness and cleanliness of the surface of the outer ring part 300. This step is crucial for improving the overall quality and performance of the motor bearing and can effectively avoid performance degradation caused by surface defects.
[0080] Finally, the inner ring part 100, the rolling elements 200 and the outer ring part 300 are assembled to obtain a complete motor bearing. During the assembly process, the coaxiality and mating accuracy of each component are ensured to guarantee the stability and reliability of the motor bearing during operation. Through precise assembly technology, the performance of the motor bearing can be further optimized to meet the high requirements under the background of the high voltage of new energy vehicles.
[0081] It should be understood that the terms first, second, etc. are only used for distinguishing descriptions and cannot be construed as indicating or implying relative importance. Although the terms first, second, etc. may be used herein to describe various units, these units should not be limited by these terms. These terms are only used to distinguish one unit from another. For example, the first unit may be referred to as the second unit, and similarly the second unit may be referred to as the first unit, without departing from the scope of the exemplary embodiments of the present invention.
[0082] It should be understood that the term "and / or" herein is merely a description of the relationship between associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, B exists alone, and A and B exist simultaneously. The term " / and" herein describes another relationship between associated objects, indicating that two relationships may exist. For example, A / and B may represent: A exists alone, and A and B exist. Additionally, the character " / " herein generally indicates that the associated objects before and after are in an "or" relationship.
[0083] It should be understood that in the description of the present invention, the orientation or positional relationship indicated by terms such as "above", "vertical", "inside", "outside", etc. is the orientation or positional relationship in which the disclosed product is customarily placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.
[0084] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0085] The terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments of the present invention. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that when the terms "include", "include(s)", "comprise", and / or "comprise(s)" are used herein, they specify the presence of the stated features, integers, steps, operations, units, and / or components, and do not preclude the presence or addition of one or more other features, quantities, steps, operations, units, components, and / or their combinations.
[0086] Specific details are provided in the following description to facilitate a complete understanding of example embodiments. However, those of ordinary skill in the art should understand that example embodiments may be implemented without these specific details. In other instances, well-known processes, structures, and techniques have not been shown in unnecessary detail to avoid obscuring the example embodiments.
[0087] The above are only specific implementation manners of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but rather should be accorded the widest scope consistent with the principles and novel features claimed herein.
[0088] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of the present disclosure, and thus may include information that does not constitute the prior art known to those of ordinary skill in the art.
Claims
1. A motor bearing with an insulating coating layer, characterized in that, The motor bearing includes: An inner ring member; Rolling elements, provided with a plurality of them, and arranged at intervals along the circumferential direction on the outer peripheral surface of the inner ring member; An outer ring member, coaxially arranged with the inner ring member, the outer ring member is sleeved on the outside of the inner ring member and the rolling elements, the outer ring member is provided with a plurality of first regions and a plurality of second regions, the first regions and the second regions are alternately arranged in sequence along the circumferential direction on the outer peripheral surface of the outer ring member, a first insulating layer is provided on the first region, a second insulating layer made of a material different from that of the first insulating layer is provided on the second region, and the second insulating layer can contact the bearing housing after thermal expansion, so that the second insulating layer forms a heat transfer path between the outer ring member and the bearing housing.
2. The motor bearing with an insulating coating layer as described in claim 1, wherein: The first insulating layer is formed by spraying an insulating material.
3. The motor bearing with an insulating coating layer as described in claim 2, wherein: The thickness of the first insulating layer is 50 to 100 microns.
4. The motor bearing with an insulating coating layer as described in claim 1, wherein: The electrical strength of the first insulating layer is not less than 2 kV / mm.
5. The motor bearing with an insulating coating layer as described in claim 4, characterized in that: The first insulating layer is made of one or more of polyether ether ketone, polyimide, and polyamide-imide.
6. The motor bearing with an insulating coating layer as described in claim 1, characterized in that: A groove extending along the axial direction of the outer ring member is provided on the second region, and the second insulating layer is arranged in the groove.
7. The motor bearing with an insulating coating layer as described in claim 6, characterized in that: The thickness of the second insulating layer is greater than that of the first insulating layer, and the outer side wall of the second insulating layer is at the same height as that of the first insulating layer.
8. The motor bearing with an insulating coating layer as claimed in claim 1, wherein: The coefficient of thermal expansion of the second insulating layer is not less than 30×10 -6 °C -1 .
9. The motor bearing with an insulating coating layer as described in claim 1, characterized in that: The ratio of the width of the second insulating layer to the thickness of the second insulating layer is greater than 2.
10. A manufacturing method of a motor bearing, characterized in that, The manufacturing method is applied to the manufacturing of the motor bearing according to any one of claims 1-9, and the manufacturing method includes: Taking the outer ring member on the bearing part, and processing a plurality of grooves arranged at intervals on the outer peripheral surface of the outer ring member, the grooves form the second region, and the unprocessed region on the outer ring member forms the first region; After cleaning the outer ring member, drying the outer ring member; After laser treatment in the first region, spraying an insulating material in the first region to form a first insulating layer; Preheating the outer ring member at a preheating temperature of 80 to 100 °C; Injecting and molding a second insulating layer in the second region of the outer ring member; After cooling the outer ring member, performing surface treatment and cleaning; Assembling the inner ring member, the rolling elements and the outer ring member to obtain a motor bearing.