Structure for preventing electric corrosion of motor bearing
By opening holes in the shaft and using three-claw conductive seats and conductive pins to deduct the current, the problem of electric corrosion of the bearings of new energy vehicles is solved, and a simple and effective protective effect is achieved.
Patent Information
- Application Number
- CN202421833666.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-31
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2034-07-31
AI Technical Summary
When permanent magnet motors for new energy vehicles are inverted, the bearings are electrocorrosive due to the accumulation of shaft voltage, which affects the service life and increases maintenance costs. Existing solutions such as replacing insulated bearings or conductive parts have problems such as contact wear and poor conductivity.
The shaft is opened and the current is exported using the three-claw conductive seat and the conductive pin. The current on the motor shaft is exported through the conductive pin and the three-claw conductive seat to prevent the shaft current from passing through the bearing.
It effectively prevents electrical corrosion of bearings, has a simple structure and is convenient to install, ensuring conductive effect and avoids electrical corrosion problems of bearings.
Smart Images
Figure CN223066958U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of motors, and more specifically, to a structure for preventing electric corrosion of motor bearings. Background Art
[0002] When a permanent magnet motor for a new energy vehicle is frequency-converted, shaft voltage will be generated between the motor rotor shaft, the shaft and the bearing. When the shaft voltage accumulates to the maximum bearing value of the bearing, it will break down the bearing and discharge inside the bearing, thereby generating an electric corrosion phenomenon, affecting the service life of the bearing, and increasing the maintenance cost of the entire motor.
[0003] In order to avoid the electric corrosion failure of the bearing, some manufacturers replace the insulating bearing. However, after the motor bearing is insulated, the shaft voltage (current) will cause electric corrosion to the bearing on the reducer side, and the problem has not been fundamentally solved. There are also some manufacturers that connect conductive parts such as conductive brushes or conductive rings to the motor shaft to conduct the shaft voltage (current) on the motor shaft to the ground. However, during the high-speed operation of the motor shaft, the high-speed rotation of its conductive brushes or conductive rings will cause contact wear with surrounding related parts (such as the motor housing), resulting in poor contact and poor conductivity. Summary of the Utility Model
[0004] In order to solve the above technical problems, the purpose of the utility model is to provide a structure for preventing electric corrosion of motor bearings, which is simple in structure, convenient to install, and can effectively prevent electric corrosion of the bearings.
[0005] In order to achieve the above utility model purpose, the utility model adopts the following technical solutions:
[0006] A structure for preventing electric corrosion of motor bearings includes a motor cover plate and a rotating shaft. One end of the rotating shaft is rotatably arranged on the motor cover plate through a bearing, and further includes a conductive pin and a three-claw conductive seat. The conductive pin is inserted and fixed in the middle of the three-claw conductive seat, the outer ring of the three-claw conductive seat is fixed on the motor cover plate, a blind hole is provided at the end of the rotating shaft, and the conductive pin abuts against the blind hole.
[0007] As a preferred solution: The conductive pin includes a pin body. One end of the pin body is provided with a groove, a spring is arranged in the groove, and a steel ball is also arranged at the opening of the groove. The spring makes the steel ball always abut against the bottom of the blind hole.
[0008] As a preferred solution: The groove of the pin body is filled with conductive grease, and an oil seal is also arranged between the blind hole near the opening and the pin body.
[0009] As a preferred solution: A carbon rod block is also arranged in the blind hole, and the spring makes the steel ball, the carbon rod block and the blind hole always abut against each other.
[0010] As a preferred solution: The conductive pin includes a pin body, and a plurality of conductive wires are arranged at intervals at the end of the pin body, and the conductive wires are always in contact with the bottom of the blind hole.
[0011] As a preferred solution: The three-claw conductive seat includes a support ring and three support arms fixedly arranged at equal intervals on the outer wall of the support ring. The support arms are fixed to the motor cover plate by bolts, and the conductive pin is inserted and fixed in the support ring.
[0012] As a preferred solution: A resolver rotor is also sleeved on the rotating shaft, and the resolver rotor is fastened to the rotating shaft by a resolver rotor retaining ring.
[0013] As a preferred solution: A resolver stator is also arranged on the periphery of the resolver rotor, and the resolver stator is fastened to the motor cover plate by a resolver stator pressing plate.
[0014] As a preferred solution: The resolver stator pressing plate is integrally C-shaped, and the resolver stator pressing plate and the three-claw conductive seat are fastened to the motor cover plate by the same set of bolts.
[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0016] By opening a hole on the rotating shaft and using the three-claw conductive seat to make the conductive pin contact with the blind hole of the rotating shaft, the present utility model enables the current generated on the motor shaft to be led out through the conductive pin and the three-claw conductive seat, preventing the shaft current from passing through the bearing and solving the problem of bearing electro-corrosion. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The specification drawings forming a part of the present application are used to provide a further understanding of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute a limitation to the present application.
[0018] Figure 1 is the overall structural schematic diagram of the present utility model;
[0019] Figure 2 is the exploded structural schematic diagram of Embodiment 1 of the present utility model;
[0020] Figure 3 is the cross-sectional structural schematic diagram of Embodiment 1 of the present utility model;
[0021] Figure 4 is the partial enlarged structural schematic diagram of Embodiment 1 of the present utility model;
[0022] Figure 5 is the exploded structural schematic diagram of Embodiment 2 of the present utility model;
[0023] Figure 6 is the cross-sectional structural schematic diagram of Embodiment 2 of the present utility model;
[0024] Figure 7 It is a partial enlarged structural schematic diagram of Embodiment 2 of the present utility model;
[0025] The reference numerals in the drawings are: 1, motor cover plate; 2, rotating shaft; 21, blind hole; 3, conductive pin; 30, spring; 31, pin body; 32, steel ball; 33, conductive wire; 4, three-claw conductive seat; 5, resolver stator; 6, resolver stator pressing plate; 7, resolver rotor; 8, resolver rotor retaining ring; 9, oil seal. Specific embodiments
[0026] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.
[0027] 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 "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0028] In addition, in the description of the present utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying 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 utility model.
[0029] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise stated, the meaning of "plurality" is two or more, unless otherwise clearly defined.
[0030] In the present utility model, unless otherwise clearly specified or defined, terms such as "installation", "connection", "linkage", "fixation", etc. shall 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 an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0031] In the present utility model, unless otherwise clearly specified or defined, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on the top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "under the bottom of" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.
[0032] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments:
[0033] Embodiment 1
[0034] As Figures 1 to 4 shown, a structure for preventing the electro-corrosion of a motor bearing includes a motor cover plate 1, a rotating shaft 2, a conductive pin 3, and a three-claw conductive seat 4. One end of the rotating shaft 2 is rotatably arranged on the motor cover plate 1 through a bearing. The conductive pin 3 is inserted and fixed in the middle of the three-claw conductive seat 4. The outer ring of the three-claw conductive seat 4 is fixed on the motor cover plate 1. A blind hole 21 is provided at the end of the rotating shaft 2, and the conductive pin 3 abuts against the blind hole 21.
[0035] The conductive pin 3 includes a pin body 31. A groove is provided at one end of the pin body 31. A spring 30 is arranged in the groove, and a steel ball 32 is further provided at the opening of the groove. The spring 30 enables the steel ball 32 to always abut against the bottom of the blind hole 21.
[0036] The conductive pin and the shaft share the same center line, and there is no radial contact between the conductive pin and the rotating shaft; the front end of the conductive pin is a rotatable steel ball, and the steel ball has a point contact with the rotating shaft; the conductive pin is internally provided with a spring. When the contact surface between the steel ball and the rotating shaft is worn, the stroke can be compensated to ensure that the conductive pin always remains in contact with the rotating shaft; the conductive effect is better, and it can better avoid the electro-corrosion of the bearing.
[0037] The three-claw conductive seat 4 includes a support ring and three support arms fixed to the outer wall of the support ring at equal intervals, the support arms are fixed to the motor cover 1 by bolts, and the conductive pin 3 is inserted and fixed in the support ring. The conductive pin and the support ring can be fixed by threaded fixing, interference fit, etc.
[0038] The rotating shaft 2 is also provided with a resolver rotor 7, and the resolver rotor 7 is fastened to the rotating shaft 2 by a resolver rotor pressure ring 8. The resolver rotor 7 is also provided with a resolver stator 5 on the periphery, and the resolver stator 5 is fastened to the motor cover 1 by a resolver stator pressure plate 6. The resolver stator pressure plate 6 is C-shaped as a whole, and the resolver stator pressure plate 6 and the three-claw conductive seat 4 are fastened to the motor cover 1 by the same set of bolts.
[0039] The groove of the pin body 31 is filled with conductive grease. As the front end steel ball rotates, the conductive grease will gradually coat the surface of the steel ball, thereby achieving the function of conducting shaft current. At the same time, the conductive grease overflowing from the steel ball end will be stored in the blind hole of the rotating shaft. An oil seal 9 is also provided between the blind hole 21 near the opening and the pin body 31.
[0040] The current path of the shaft in the above structure is as follows: shaft → conductive pin → three-claw conductive seat → motor cover grounding.
[0041] In other embodiments, a carbon rod block is further provided in the blind hole 21, and the spring 30 makes the steel ball 32, the carbon rod block and the blind hole 21 always abut each other. The carbon rod block is interference fit with the rotating shaft, and the size of the carbon rod block can be adjusted according to the size of the rotating shaft; the end of the conductive pin is against the carbon rod block; the rotating shaft, the carbon rod block and the conductive pin are all in the same axial position;
[0042] The current path of the rotating shaft in the above structure is as follows: rotating shaft → carbon rod block → conductive pin → three-claw conductive seat → motor cover grounding.
[0043] Example 2
[0044] like Figures 5 to 7 As shown, a structure for preventing electric corrosion of motor bearings includes a motor cover 1, a rotating shaft 2, a conductive pin 3 and a three-claw conductive seat 4, one end of the rotating shaft 2 is rotatably arranged on the motor cover 1 through a bearing, the conductive pin 3 is inserted and fixed in the middle of the three-claw conductive seat 4, the outer ring of the three-claw conductive seat 4 is fixed on the motor cover 1, and a blind hole 21 is provided at the end of the rotating shaft 2, and the conductive pin 3 is against the blind hole 21.
[0045] The three-claw conductive seat 4 includes a support ring and three support arms fixed to the outer wall of the support ring at equal intervals, the support arms are fixed to the motor cover 1 by bolts, and the conductive pin 3 is inserted and fixed in the support ring. The conductive pin and the support ring can be fixed by threaded fixing, interference fit, etc.
[0046] A resolver rotor 7 is also sleeved on the rotating shaft 2, and the resolver rotor 7 is fastened to the rotating shaft 2 by a resolver rotor retaining ring 8. A resolver stator 5 is further arranged on the periphery of the resolver rotor 7, and the resolver stator 5 is fastened to the motor cover 1 by a resolver stator retaining plate 6. The resolver stator retaining plate 6 is integrally C-shaped, and the resolver stator retaining plate 6 and the three-claw conductive base 4 are fastened to the motor cover 1 by the same set of bolts.
[0047] The conductive pin 3 includes a pin body 31, and a plurality of conductive wires 33 are arranged at intervals at the end of the pin body 31. The conductive wires 33 are always in contact with the bottom of the blind hole 21. The above structure arranges flexible and wear-resistant conductive wires at the end of the conductive pin (the number of arranged conductive wires can be adjusted according to the actual current magnitude), so that the current on the rotating shaft can be led out after passing through the conductive wires, the pin body, the three-claw conductive base and the motor cover in sequence, avoiding bearing corrosion.
[0048] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.
[0049] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention without departing from the principles and purposes of the present invention. Any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.
Claims
1. A structure for preventing electric corrosion of a motor bearing, comprising a motor cover plate (1) and a rotating shaft (2), one end of the rotating shaft (2) is rotatably arranged on the motor cover plate (1) through a bearing, and it is characterized in that: It further includes a conductive pin (3) and a three-claw conductive base (4). The conductive pin (3) is inserted and fixed in the middle of the three-claw conductive base (4). The outer ring of the three-claw conductive base (4) is fixed on the motor cover plate (1). A blind hole (21) is provided at the end of the rotating shaft (2), and the conductive pin (3) abuts against the blind hole (21).
2. The structure for preventing electrical corrosion of a motor bearing according to claim 1, wherein: The conductive pin (3) includes a pin body (31). One end of the pin body (31) is provided with a groove. A spring (30) is arranged in the groove. A steel ball (32) is also provided at the opening of the groove. The spring (30) makes the steel ball (32) always abut against the bottom of the blind hole (21).
3. A structure for preventing electrical corrosion of a motor bearing according to claim 2, characterized in that: The groove of the pin body (31) is filled with conductive grease. An oil seal (9) is also provided between the blind hole (21) near the opening and the pin body (31).
4. A structure for preventing electrical corrosion of a motor bearing according to claim 2, characterized in that: A carbon rod block is also provided in the blind hole (21). The spring (30) makes the steel ball (32), the carbon rod block and the blind hole (21) always abut against each other.
5. A structure for preventing electric corrosion of a motor bearing according to claim 1, characterized in that: The conductive pin (3) includes a pin body (31). A plurality of conductive wires (33) are arranged at intervals at the end of the pin body (31). The conductive wires (33) always abut against the bottom of the blind hole (21).
6. The structure for preventing electrical corrosion of a motor bearing according to claim 1, characterized in that: The three-claw conductive base (4) includes a support ring and three support arms fixed at equal intervals on the outer wall of the support ring. The support arms are fixed to the motor cover plate (1) by bolts. The conductive pin (3) is inserted and fixed in the support ring.
7. A structure for preventing electrical corrosion of a motor bearing according to claim 1, characterized in that: A resolver rotor (7) is also sleeved on the rotating shaft (2), and the resolver rotor (7) is fastened to the rotating shaft (2) by a resolver rotor retaining ring (8).
8. A structure for preventing electrical corrosion of a motor bearing according to claim 7, characterized in that: A resolver stator (5) is also provided on the periphery of the resolver rotor (7). The resolver stator (5) is fastened to the motor cover plate (1) by a resolver stator pressing plate (6).
9. The structure for preventing electric corrosion of a motor bearing according to claim 8, wherein: The resolver stator pressing plate (6) is integrally C-shaped, and the resolver stator pressing plate (6) and the three-claw conductive base (4) are fastened to the motor cover plate (1) by the same set of bolts.