Motor capable of preventing bearing jamming and bearing electrocorrosion
By adding support bearings to the shaft of new energy vehicle motors and using conductive grease pipelines to solve the problem of electric corrosion of bearings, the problem of power loss caused by bearing jamming and electric corrosion is solved, and the safety of the vehicle is improved when driving at high speeds is improved .
Patent Information
- Application Number
- CN202421246971.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-03
- Publication Date
- 2025-02-25
- Estimated Expiration
- 2034-06-03
AI Technical Summary
In new energy vehicle motors, bearings are prone to jamming and electrical corrosion, which may cause the car to lose power during driving and produce NVH abnormal noise.
A motor structure is designed, by adding support bearings to the rotating shaft and setting conductive grease pipes in the motor housing to ensure that when the working bearing is abnormal, the support bearing intervenes in support movement, prevents the motor from stopping its work, and is carried out through conductive lubrication. Grease solves the problem of electric corrosion of bearings.
It effectively prevents the loss of power caused by bearing jamming, improves the safety of the vehicle when driving at high speed, and solves the problem of electric corrosion of the bearing. The overall structure is simple and has cost advantages.
Smart Images
Figure CN222531427U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of motor structures for new energy vehicles, and in particular relates to a motor capable of preventing bearings from getting stuck and electrical corrosion of bearings. Background Art
[0002] In the field of new energy vehicles, the motor is the main power output component, which generally has a high rotation speed. The shaft and the casing are usually connected by bearings. However, the drive motor has failure problems such as bearing electrical corrosion and bearing jamming during use. Bearing electrical corrosion can cause the car to produce NVH abnormal noise, and bearing jamming can cause serious problems such as sudden loss of power during driving.
[0003] At present, the motor is supported by two ball bearings at the front and rear ends to ensure that the eccentricity of the motor shaft is within a safe range. When the bearings are burned and stuck, the bearings will lose their supporting function. At the same time, when the eccentricity of the motor shaft exceeds the safe range, affecting the safe operation of the transformer or even the stator and rotor, the system will alarm, the motor will stop working immediately and the car will lose driving force, which may easily cause major safety accidents. In addition, since the voltage on the motor shaft cannot be released in the current system, the bearing will be damaged by electrical corrosion, which may cause system NVH problems at the least and cause the bearing to burn and stick at the worst. Utility Model Content
[0004] In order to solve the above technical problems, the purpose of the utility model is to provide a motor that can prevent bearing jamming and bearing electrical corrosion, which can solve the problem of power loss caused by bearing melting and improve the safety of the vehicle when driving at high speed.
[0005] In order to achieve the above utility model purpose, the utility model adopts the following technical solutions:
[0006] A motor for preventing bearing jamming and bearing electrical corrosion comprises a motor housing, a front end cover, a stator assembly, a rotor core and a rotating shaft, wherein the stator assembly is fixed to the inner wall of the motor housing, the rotor core is fixed to the rotating shaft and is arranged on the inner side of the stator assembly, the two ends of the rotating shaft are rotatably connected to the front end cover and the motor housing through a working bearing A and a working bearing B respectively, a supporting bearing A is further provided on the rotating shaft on the outer side of the working bearing A, a gap δ1 is provided between the supporting bearing A and the front end cover, the maximum eccentricity of the rotating shaft is δ2, and δ1>δ2.
[0007] As a preferred solution: an oil port A is provided on the front end cover, and a front end cover pipeline is also provided inside the front end cover, one end of the front end cover pipeline is connected to the oil port A, and the other end is connected to the vicinity of the support bearing A, the front end cover pipeline is filled with conductive grease, and an oil seal A for blocking the conductive grease is also provided on the rotating shaft, and the oil seal A is located on the outside of the working bearing A.
[0008] As a preferred solution: a support bearing B is further provided on the rotating shaft outside the working bearing B, and the gap between the support bearing B and the motor housing is also δ1.
[0009] As a preferred solution: a rear end cover is also fixed to the other end of the motor housing, and the gap between the support bearing B and the rear end cover is also δ1; an oil port B is provided on the rear end cover, and a rear end cover pipeline is also provided inside the rear end cover, one end of the rear end cover pipeline is connected to the oil port B, and the other end is connected to the vicinity of the support bearing B, the rear end cover pipeline is filled with conductive grease, and an oil seal B for blocking conductive grease is also provided on the rotating shaft, and the oil seal B is located on the outside of the working bearing B.
[0010] As a preferred solution: an axial pipeline is also provided on the motor housing, and two ends of the axial pipeline are respectively connected to the front cover pipeline and the rear cover pipeline.
[0011] As a preferred solution: there are two front end cover pipelines, one end of the two front end cover pipelines are connected to the vicinity of the support bearing A, the other end of one front end cover pipeline is connected to the axial pipeline, and the other end of the other front end cover pipeline is connected to the oil port A; there are two rear end cover pipelines, one end of the two rear end cover pipelines are connected to the vicinity of the support bearing B, the other end of one rear end cover pipeline is connected to the axial pipeline, and the other end of the other rear end cover pipeline is connected to the oil port B.
[0012] As a preferred solution: there are also two axial pipelines, and both ends of the two axial pipelines are respectively connected to two front end cover pipelines and two rear end cover pipelines.
[0013] As a preferred solution: the two front end cover pipelines have an angle of 180 degrees, and the two rear end cover pipelines also have an angle of 180 degrees.
[0014] As a preferred solution: the oil port A and the oil port B form an angle of 180 degrees.
[0015] As a preferred solution: the front end cover is further provided with a circle of convex edges A, and the rear end cover is further provided with a circle of convex edges B, and the convex edges A and B are respectively clamped at the two ends of the motor housing.
[0016] The utility model adds a support bearing to the rotating shaft, and the support bearing will not participate in the movement as a support point when the motor is operating normally; however, when the normally working bearing becomes abnormal, the eccentricity of the motor shaft will increase. After the eccentricity exceeds the safe range, the support bearing will immediately intervene in the supporting movement to ensure that the motor continues to work normally, prevent affecting the safe operation of other components, and then cause the motor to stop working, thereby improving the safety of the vehicle when driving at high speed. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The drawings in the specification, which constitute a part of the present application, are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute a limitation on the present application.
[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0019] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model;
[0020] Figure 3 and Figure 4 It is a schematic diagram of the partial decomposition structure of the utility model at two different angles;
[0021] Figure 5 It is a schematic diagram of the structure of the utility model after partial disassembly and segmentation.
[0022] The accompanying drawings are marked as follows: 1. motor housing; 11. axial pipeline; 3. front end cover; 31. front end cover pipeline; 32. oil seal A; 33. convex edge A; 34. oil port A; 35. working bearing A; 2. rear end cover; 21. rear end cover pipeline; 22. working bearing B; 23. oil seal B; 24. oil port B; 25. convex edge B; 4. stator assembly; 5. rotor core; 6. rotating shaft; 7. support bearing B; 8. support bearing A. DETAILED DESCRIPTION
[0023] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.
[0024] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.
[0025] In addition, in the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "plurality" means two or more, unless otherwise clearly defined.
[0027] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like 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, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0028] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.
[0029] The utility model is further described below in conjunction with the accompanying drawings and embodiments:
[0030] like Figures 1 to 5A motor for preventing bearing jamming and bearing electrical corrosion is shown, comprising a motor housing 1, a front end cover 3, a stator assembly 4, a rotor core 5 and a rotating shaft 6, wherein the stator assembly 4 is fixed to the inner wall of the motor housing 1, the rotor core 5 is fixed to the rotating shaft 6 and is arranged on the inner side of the stator assembly 4, and the two ends of the rotating shaft 6 are rotatably connected to the front end cover 3 and the motor housing 1 through a working bearing A35 and a working bearing B22 respectively, and a support bearing A8 is also provided on the rotating shaft 6 on the outer side of the working bearing A35, and a gap δ1 is provided between the support bearing A8 and the front end cover 3, and the maximum eccentricity of the rotating shaft is δ2, δ1>δ2.
[0031] The front cover 3 is provided with an oil port A34, and the front cover 3 is also provided with a front cover pipeline 31, one end of the front cover pipeline 31 is connected to the oil port A34, and the other end is connected to the vicinity of the support bearing A8, and the front cover pipeline 31 is filled with conductive grease, and the rotating shaft 6 is also provided with an oil seal A32 for blocking the conductive grease, and the oil seal A32 is located on the outside of the working bearing A35. The conductive grease plays a role in lubricating the support bearing; and conducts the motor shaft current to the motor housing, solving the problem of electrical corrosion of the two working bearings.
[0032] A support bearing B7 is also provided on the rotating shaft 6 on the outside of the working bearing B22, and a rear end cover 2 is also fixed to the other end of the motor housing 1. The rear end cover 2 can be integrally formed with the motor housing 1 or can be a split type. The gap between the support bearing B7 and the rear end cover 2 is δ1; an oil port B24 is provided on the rear end cover 2, and a rear end cover pipeline 21 is also provided in the rear end cover 2. One end of the rear end cover pipeline 21 is connected to the oil port B24, and the other end is connected to the vicinity of the support bearing B7. The rear end cover pipeline 21 is filled with conductive grease, and an oil seal B23 for blocking conductive grease is also provided on the rotating shaft 6, and the oil seal B23 is located on the outside of the working bearing B22.
[0033] The front end cover 3 is also provided with a circle of convex edges A33 , and the rear end cover 4 is also provided with a circle of convex edges B25 . The convex edges A33 and B25 are respectively clamped at two ends of the motor housing 1 .
[0034] In the structure of this embodiment, the gap between the resolver and the rotor shaft is set to δ3, the gaps of the two support bearings are both δ1, the air gap between the motor stator and rotor is set to δ4, and the maximum eccentricity of the motor shaft system is set to δ2; the design requires δ4>δ3>δ1>δ2, so that the support bearings will not participate in the movement as support points during normal operation of the motor; when the working bearing is abnormal, the eccentricity of the motor shaft will increase. When the eccentricity increases from δ2 to δ1, the two support bearings immediately intervene in the supporting movement to ensure that the motor continues to work normally and prevent the resolver from stopping working due to the eccentricity reaching δ3 (after the shaft eccentricity increases to δ1, if it continues to deteriorate, the working bearing will instantly burn out), and the vehicle prompts the drive system to alarm for maintenance.
[0035] The motor housing 1 is further provided with an axial pipeline 11 , and two ends of the axial pipeline 11 are respectively connected with the front cover pipeline 31 and the rear cover pipeline 21 .
[0036] There are two front end cover pipelines 31, one end of the two front end cover pipelines 31 are connected to the vicinity of the support bearing A8, the other end of one front end cover pipeline 31 is connected to the axial pipeline 11, and the other end of the other front end cover pipeline 31 is connected to the oil port A34; there are two rear end cover pipelines 21, one end of the two rear end cover pipelines 21 are connected to the vicinity of the support bearing B7, the other end of one rear end cover pipeline 21 is connected to the axial pipeline 11, and the other end of the other rear end cover pipeline 21 is connected to the oil port B24.
[0037] There are two axial pipelines 11, and the two ends of the two axial pipelines 11 are respectively connected to the two front cover pipelines 31 and the two rear cover pipelines 21. The two front cover pipelines 31 are at an angle of 180 degrees, and the two rear cover pipelines 21 are also at an angle of 180 degrees. The oil port A34 and the oil port B24 form an angle of 180 degrees.
[0038] In this embodiment, the front end cover pipeline, the rear end cover pipeline and the axial pipeline on the motor housing form a loop, and flowing conductive grease is passed through the loop to lubricate the two supporting bearings; and the motor shaft current is conducted to the motor housing to solve the problem of electrical corrosion of the two working bearings.
[0039] In summary, the utility model solves the problem of power loss caused by bearing burning, and improves the safety of the vehicle when driving at high speed; at the same time, the utility model has a simple overall structure, solves the problem of electrical corrosion of the working bearing, and has cost advantages.
[0040] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0041] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.
Claims
1. A motor for preventing bearing jamming and bearing electrical corrosion, comprising a motor housing (1), a front end cover (3), a stator assembly (4), a rotor core (5) and a rotating shaft (6), wherein the stator assembly (4) is fixed to the inner wall of the motor housing (1), the rotor core (5) is fixed to the rotating shaft (6) and is arranged on the inner side of the stator assembly (4), and the two ends of the rotating shaft (6) are rotatably connected to the front end cover (3) and the motor housing (1) through a working bearing A (35) and a working bearing B (22), respectively, and characterized in that: A support bearing A (8) is also provided on the rotating shaft (6) outside the working bearing A (35), a gap δ1 is provided between the support bearing A (8) and the front end cover (3), and the maximum eccentricity of the rotating shaft is δ2, δ1>δ2.
2. A motor for preventing bearing jamming and bearing electrical corrosion according to claim 1, characterized in that: The front end cover (3) is provided with an oil port A (34), and the front end cover (3) is also provided with a front end cover pipeline (31), one end of the front end cover pipeline (31) is connected to the oil port A (34), and the other end is connected to the vicinity of the support bearing A (8), the front end cover pipeline (31) is filled with conductive grease, and the rotating shaft (6) is also provided with an oil seal A (32) for blocking the conductive grease, and the oil seal A (32) is located on the outside of the working bearing A (35).
3. A motor for preventing bearing jamming and bearing electrical corrosion according to claim 1 or 2, characterized in that: A support bearing B (7) is also provided on the rotating shaft (6) outside the working bearing B (22), and the gap between the support bearing B (7) and the motor housing (1) is also δ1.
4. A motor for preventing bearing jamming and bearing electrical corrosion according to claim 3, characterized in that: A rear end cover (2) is also fixed to the other end of the motor housing (1), and a gap between the support bearing B (7) and the rear end cover (2) is also δ1; an oil port B (24) is provided on the rear end cover (2), and a rear end cover pipeline (21) is also provided in the rear end cover (2), one end of the rear end cover pipeline (21) is connected to the oil port B (24), and the other end is connected to the vicinity of the support bearing B (7), and the rear end cover pipeline (21) is filled with conductive grease, and an oil seal B (23) for blocking the conductive grease is also provided on the rotating shaft (6), and the oil seal B (23) is located on the outer side of the working bearing B (22).
5. A motor for preventing bearing jamming and bearing electrical corrosion according to claim 4, characterized in that: The motor housing (1) is also provided with an axial pipeline (11), and two ends of the axial pipeline (11) are respectively connected to the front cover pipeline (31) and the rear cover pipeline (21).
6. A motor for preventing bearing jamming and bearing electrical corrosion according to claim 5, characterized in that: There are two front end cover pipelines (31), one end of each of the two front end cover pipelines (31) is connected to the vicinity of the support bearing A (8), the other end of one front end cover pipeline (31) is connected to the axial pipeline (11), and the other end of the other front end cover pipeline (31) is connected to the oil port A (34); there are two rear end cover pipelines (21), one end of each of the two rear end cover pipelines (21) is connected to the vicinity of the support bearing B (7), the other end of one rear end cover pipeline (21) is connected to the axial pipeline (11), and the other end of the other rear end cover pipeline (21) is connected to the oil port B (24).
7. A motor for preventing bearing jamming and bearing electrical corrosion according to claim 6, characterized in that: There are also two axial pipelines (11), and the two ends of the two axial pipelines (11) are respectively connected to the two front end cover pipelines (31) and the two rear end cover pipelines (21).
8. A motor for preventing bearing jamming and bearing electrical corrosion according to claim 6 or 7, characterized in that: The two front end cover pipelines (31) are at an angle of 180 degrees, and the two rear end cover pipelines (21) are also at an angle of 180 degrees.
9. A motor for preventing bearing jamming and bearing electrical corrosion according to claim 8, characterized in that: The oil port A (34) and the oil port B (24) form an angle of 180 degrees.
10. A motor for preventing bearing jamming and bearing electrical corrosion according to claim 4, characterized in that: The front end cover (3) is also provided with a circle of convex edges A (33), and the rear end cover (2) is also provided with a circle of convex edges B (25), and the convex edges A (33) and the convex edges B (25) are respectively clamped at the two ends of the motor housing (1).