Conductive mechanism of motor and vehicle
By setting the limiting element to have conductive function in the conductive structure of the motor, providing a current guide path to guide the current to the motor housing, solving the electrocorrosion problem caused by high-frequency current of the bearings on the motor shaft. , achieving the effect of simplifying structure and effective protection.
Patent Information
- Application Number
- CN202323667800.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-29
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2033-12-29
AI Technical Summary
In hybrid vehicles or pure electric vehicles, the bearings on the motor shaft are prone to electrocorrosion due to high-frequency currents, especially when the vehicle voltage platform rises to 800V.
A conductive structure of a motor is designed, in which the limiting member is arranged to have a conductive function, and by contacting the limiting member on the motor shaft with the housing, a current guide path is provided to guide the current through the bearing to the motor. on the housing, thereby avoiding electrical corrosion of the bearing.
This conductive structure effectively avoids electrocorrosion of bearings, simplifies the anti-electrocorrosion structure of the drive system, and reduces space occupation and assembly complexity.
Smart Images
Figure CN222464345U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of vehicle technology, and in particular to a conductive structure of a motor and a vehicle. Background Art
[0002] In the reduction gearbox or transmission of hybrid or pure electric vehicles, the motor shaft is usually equipped with a bearing to assist the motor shaft to rotate. However, the high-frequency current on the motor shaft may flow through the bearing surface, causing electrical corrosion of the bearing. Moreover, as the vehicle voltage platform increases from 400V to 800V, the electrical corrosion of the bearing becomes more serious.
[0003] In the related art, the current that causes the electrocorrosion is guided to the outside by adding an additional conductive ring or conductive oil seal near the bearing. However, this conductive method of avoiding electrocorrosion will make the drive system structure in the vehicle complicated, occupy a large space, and increase the assembly process. Summary of the invention
[0004] In view of this, the present application provides a conductive structure of a motor and a vehicle, which can prevent electrical corrosion of the bearings on the motor shaft.
[0005] Specifically, the following technical solutions are included:
[0006] A first aspect of an embodiment of the present application provides a conductive structure of a motor, the conductive structure comprising a motor shaft, a housing, a bearing and a limiter;
[0007] The motor shaft is at least partially located inside the housing;
[0008] The outer ring of the bearing is connected to the housing, the inner ring of the bearing is fixedly sleeved on the motor shaft, and the first end of the bearing is in contact with the motor shaft;
[0009] The limiting member is fixedly sleeved on the motor shaft and abuts against the second end of the bearing to limit the bearing, and the first end and the second end are opposite to each other;
[0010] Wherein, the limiting member is a component with a conductive function, and is in contact with the motor shaft and the housing respectively.
[0011] In an implementation of the embodiment of the present application, the position-limiting member includes a body and at least one conductive unit;
[0012] A through hole is provided inside the body, and the motor shaft passes through the through hole;
[0013] One end of the conductive unit is connected to the body, and the other end is in contact with the shell.
[0014] In one implementation of the embodiment of the present application, a mounting hole is opened on the outer wall of the body, the opening direction of the mounting hole is perpendicular to the opening direction of the through hole, and the conductive unit partially extends into the mounting hole to be connected to the body.
[0015] In one implementation of the embodiment of the present application, there are multiple mounting holes, and the multiple mounting holes are spaced and evenly arranged along the circumference of the through hole;
[0016] The limiting member includes a plurality of the conductive units, and each of the conductive units is respectively connected to a corresponding mounting hole.
[0017] In an implementation manner of the embodiment of the present application, the outer periphery of the main body is a regular polygon, and each face of the regular polygon is connected to one of the conductive units.
[0018] In one implementation of the embodiment of the present application, the shell has a matching cavity inside, the limiting member is located in the matching cavity, and one end of the conductive unit away from the body is in contact with the inner wall of the matching cavity.
[0019] In one implementation of the embodiment of the present application, the conductive unit includes a connecting segment and a conductive segment;
[0020] One end of the connecting section is connected to the mounting hole, and the other end is connected to the conductive section;
[0021] The conductive segment is at least partially located outside the mounting hole and includes a plurality of carbon rods arranged in an array, wherein the carbon rods are in contact with the shell.
[0022] In one implementation of the embodiment of the present application, an external thread is provided on a side of the connecting section close to the through hole, an internal thread is provided in the mounting hole, and the internal thread matches the external thread.
[0023] In an implementation manner of the embodiment of the present application, the limiting member is threadedly connected to the motor shaft.
[0024] A second aspect of an embodiment of the present application provides a vehicle, wherein the vehicle includes the conductive structure of the above-mentioned motor.
[0025] The beneficial effects of the technical solution provided by the embodiments of the present application include at least:
[0026] The conductive mechanism of the motor and the vehicle provided in the embodiments of the present application can provide a current guiding path to guide the current passing through the bearing to the motor housing, thereby avoiding electrical corrosion of the bearing, by setting the limiting member on the motor shaft for limiting the bearing as a component with a conductive function. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0028] Figure 1 An assembly diagram of a stopper and a motor shaft provided in an embodiment of the present application is shown;
[0029] Figure 2 A first structural schematic diagram of a position limiting member provided in an embodiment of the present application is shown;
[0030] Figure 3 A second structural schematic diagram of the position limiting member provided in an embodiment of the present application is shown;
[0031] Figure 4 A schematic diagram of the structure of a conductive unit provided in an embodiment of the present application is shown;
[0032] Figure 5 A partial enlarged view of a conductive unit provided in an embodiment of the present application is shown. Description of the drawings:
[0034] 1. Motor shaft;
[0035] 2. housing; 21. matching cavity;
[0036] 3. Bearings;
[0037] 4. Limiting member; 41. Main body; 411. Through hole; 412. Mounting hole; 42. Conductive unit; 421. Connecting section; 422. Conductive section; 4221. Carbon rod.
[0038] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION
[0039] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application. In order to make the technical solutions and advantages of the present application clearer, the conductive mechanism of the motor and the vehicle will be described in detail below in conjunction with the drawings.
[0040] In the reduction gearbox or transmission of hybrid or pure electric vehicles, the motor shaft is usually equipped with a bearing to assist the motor shaft to rotate. However, the high-frequency current on the motor shaft may flow through the bearing surface, causing electrical corrosion of the bearing. Moreover, as the vehicle voltage platform increases from 400V to 800V, the electrical corrosion of the bearing becomes more serious.
[0041] In the related art, the current that causes the electrocorrosion is guided to the outside by adding an additional conductive ring or conductive oil seal near the bearing. However, this conductive method of avoiding electrocorrosion will make the drive system structure in the vehicle complicated, occupy a large space, and increase the assembly process.
[0042] In this regard, an embodiment of the present application provides a conductive structure of a motor, such as Figure 1 As shown, the conductive structure may include a motor shaft 1, a housing 2, a bearing 3 and a limiter 4; the motor shaft 1 is at least partially located inside the housing 2; the outer ring of the bearing 3 is connected to the housing 2, the inner ring of the bearing 3 is fixedly sleeved on the motor shaft 1, and the first end of the bearing 3 abuts against the motor shaft 1; the limiter 4 is fixedly sleeved on the motor shaft 1 and abuts against the second end of the bearing 3, and is used to limit the bearing 3, with the first end and the second end facing each other; wherein the limiter 4 is a component with a conductive function, and is in contact with the motor shaft 1 and the housing 2 respectively.
[0043] The conductive structure of the motor provided in the embodiment of the present application can provide a current guiding path to guide the current passing through the bearing 3 to the motor housing 2, thereby avoiding electrical corrosion of the bearing 3, by setting the limiting member 4 on the motor shaft 1 for limiting the bearing 3 as a component with a conductive function.
[0044] In addition, in the conductive structure provided in the embodiment of the present application, the limiter 4 originally used to limit the bearing 3 is improved so that it has both the limiting and conductive functions. Therefore, there is no need to arrange other conductive or anti-electrical devices to prevent the bearings on the motor shaft from being electrolytically corroded, which simplifies the anti-electrolytic corrosion structure in the drive system, takes up less space, and simplifies the assembly process.
[0045] In some embodiments, Figure 1 and Figure 2 As shown, the stopper 4 can be any one of a snap ring, a locking ring or a nut. The stopper 4 can abut against the inner ring of the bearing 3 sleeved on the motor shaft 1, and rotate with the motor shaft 1 together with the inner ring. In addition, in some embodiments, the height of the stopper 4 in the radial direction of the motor shaft 1 can be lower than the height of the outer ring of the bearing 3, and the stopper 4 can be isolated from the outer ring, so that the stopper 4 will not rub against the outer ring of the bearing 3 during the rotation of the motor shaft 1.
[0046] In one implementation of the embodiment of the present application, Figure 2As shown, the limiter 4 includes a body 41 and at least one conductive unit 42 ; a through hole 411 is provided inside the body 41 , and the motor shaft 1 passes through the through hole 411 ; one end of the conductive unit 42 is connected to the body 41 , and the other end is in contact with the housing 2 .
[0047] In the conductive structure of the motor provided in the embodiment of the present application, the motor shaft 1 can be interference-fitted with the through hole 411, so that the limiter 4 is fixedly sleeved on the motor shaft 1. And the conductive unit 42 is arranged on the body 41, so that when the motor shaft 1 rotates, the body 41 is driven to rotate, and then the conductive unit 42 is driven to rotate. The conductive unit 42 contacts the housing 2 during the rotation process, so that the current on the motor shaft 1 or the current on the bearing 3 can flow to the housing 2 through the body 41 and the conductive unit 42 to achieve the grounding of the motor shaft 1. By forming the above-mentioned current guiding path to achieve the grounding of the motor shaft 1, it is possible to avoid electrical corrosion of the bearing 3 sleeved on the motor shaft 1.
[0048] In one implementation of the embodiment of the present application, Figure 3 As shown, a mounting hole 412 is opened on the outer wall of the body 41 , and the opening direction of the mounting hole 412 is perpendicular to the opening direction of the through hole 411 . The conductive unit 42 partially extends into the mounting hole 412 to be connected with the body 41 .
[0049] In other words, the conductive unit 42 can be arranged along the radial direction of the body 41, perpendicular to the central axis of the stopper 4. Compared with setting the conductive unit 42 parallel to the opening direction of the through hole 411, since the conductive unit 42 in the vertical direction is more easily supported by the mechanical load, the arrangement adopted in the embodiment of the present application can provide better mechanical stability for the conductive unit 42. In addition, the conductive unit 42 is arranged along the radial direction of the body 41, which can expand the radial size of the stopper 4. In contrast, if the conductive unit 42 is arranged parallel to the opening direction of the through hole 411 (i.e., arranged along the axial direction of the body 41), when the conductive unit 42 rotates with the body 41, the end of the conductive unit 42 away from the body 41 makes a circular motion in a plane perpendicular to the axial direction of the body 41, and the range of motion is smaller than that of the conductive unit 42 in the vertical direction, and it is not easy to come into contact with the housing 2. If the conductive function needs to be realized, the housing 2 has higher requirements, and a smaller space needs to be processed to cooperate with the conductive unit 42, which increases the manufacturing difficulty and cost of the housing 2.
[0050] In one implementation of the embodiment of the present application, Figure 1As shown, the housing 2 has a matching cavity 21 inside, the stopper 4 is located in the matching cavity 21, and the end of the conductive unit 42 away from the body 41 is in contact with the inner wall of the matching cavity 21. By providing the matching cavity 21 for the stopper 4 in the housing 2, it is convenient to achieve that the end of the conductive unit 42 away from the body 41 is in continuous and stable contact with the housing 2, thereby improving the grounding reliability of the motor shaft 1.
[0051] In one implementation of the embodiment of the present application, Figure 3 As shown, there are multiple mounting holes 412 , which are spaced and evenly arranged along the circumference of the through hole 411 ; the position limiting member 4 includes multiple conductive units 42 , and each conductive unit 42 is respectively connected to a corresponding mounting hole 412 .
[0052] In the conductive structure of the motor provided in the embodiment of the present application, a plurality of conductive units 42 are provided which are spaced apart and evenly arranged, so that the wear generated by the conductive units 42 during rotation is more evenly distributed on the surface of each carbon brush, and the current can be simultaneously directed to the housing 2 through the plurality of conductive units 42, resulting in a better conductive effect.
[0053] In one implementation of the embodiment of the present application, Figure 2 As shown, the outer periphery of the body 41 is a regular polygon, and each face of the regular polygon is connected to a conductive unit 42 .
[0054] In the conductive structure of the motor provided in the embodiment of the present application, the outer contour of the body 41 is set to a polygonal shape, which can make it easier to install and disassemble. When the staff needs to tighten or loosen, the polygon provides more force application surfaces, making the operation more convenient and labor-saving. In addition, the polygonal outer contour of the body 41 can provide a larger installation plane for opening the installation hole 412, thereby improving the installation stability of the conductive unit 42.
[0055] In one implementation of the embodiment of the present application, Figure 4 and Figure 5 As shown, the conductive unit 42 includes a connecting segment 421 and a conductive segment 422; one end of the connecting segment 421 is connected to the mounting hole 412, and the other end is connected to the conductive segment 422; the conductive segment 422 is at least partially located outside the mounting hole 412, and includes a plurality of carbon rods 4221 arranged in an array, and the carbon rods 4221 are in contact with the shell 2.
[0056] In the conductive structure of the motor provided in the embodiment of the present application, the connecting section 421 is mainly used to connect the carbon rod 4221 and the main body 41, and the current on the motor shaft 1 (or bearing 3) is guided to the carbon rod 4221 through the main body 41 and the connecting section 421; and the carbon rod 4221 is the working part of the carbon brush, which is responsible for contacting the shell 2. The carbon rod 4221 usually has good friction conductivity properties and can provide a stable current conduction effect, and the carbon rod 4221 usually has self-lubricating properties, which helps to reduce friction and wear between the shell 2 and can extend the service life of the conductive unit 42; in addition, since the carbon brush will generate a certain amount of heat during the friction working process, the carbon rod 4221 section is set to a structure composed of a plurality of carbon rods 4221 arrays, and each carbon rod 4221 has a certain gap between them, which helps the carbon rod 4221 section to dissipate heat and prevent it from overheating.
[0057] Optionally, the connecting segment 421 is usually made of a metal or alloy with good conductivity to ensure that the current can flow smoothly to the conductive segment 422 .
[0058] Optionally, the conductive unit 42 is a carbon brush.
[0059] In one implementation of the embodiment of the present application, an external thread is provided on one side of the connecting section 421 close to the through hole 411 , and an internal thread is provided in the mounting hole 412 , and the internal thread matches the external thread.
[0060] In the conductive structure of the motor provided in the embodiment of the present application, the connecting section 421 and the mounting hole 412 are configured to be threadedly matched to achieve a detachable connection between the connecting section 421 and the main body 41, so that the conductive unit 42 and the main body 41 can be easily disassembled and reinstalled, and the operation is easier when the conductive unit 42 needs to be replaced or maintained.
[0061] In some embodiments, the distance between the conductive segment 422 and the body 41 can be adjusted by adjusting the distance that the conductive unit 42 is screwed into the mounting hole 412 , so that the conductive segment 422 is adapted to the size of the above-mentioned cavity.
[0062] In one implementation of the embodiment of the present application, the limiting member 4 is threadedly connected to the motor shaft 1 .
[0063] In the conductive structure of the motor provided in the embodiment of the present application, the limit member 4 is detachably connected to the motor shaft 1 through a thread, which facilitates the convenient disassembly and reinstallation of the limit member 4. When the limit member 4 needs to be replaced or maintained, the operation is simpler.
[0064] An embodiment of the present application also provides a vehicle, wherein the vehicle includes the conductive structure of the above-mentioned motor.
[0065] The vehicle provided in the embodiment of the present application can provide a current guiding path to guide the current passing through the bearing 3 to the motor housing 2, thereby avoiding electrical corrosion of the bearing 3, by setting the limiting member 4 on the motor shaft 1 for limiting the bearing 3 as a component with a conductive function.
[0066] In addition, in the conductive structure provided in the embodiment of the present application, the limiter 4 originally used to limit the bearing 3 is improved so that it has both the limiting and conductive functions. Therefore, there is no need to arrange other conductive or anti-electrical devices to prevent the bearings on the motor shaft from being electrolytically corroded, which simplifies the anti-electrolytic corrosion structure in the drive system, takes up less space, and simplifies the assembly process.
[0067] In the present application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The term "plurality" refers to two or more than two, unless otherwise clearly defined.
[0068] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only.
[0069] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.
Claims
1. A conductive mechanism of a motor, characterized in that: The conductive mechanism of the motor comprises a motor shaft (1), a housing (2), a bearing (3) and a stopper (4); The motor shaft (1) is at least partially located inside the housing (2); The outer ring of the bearing (3) is connected to the housing (2), the inner ring of the bearing (3) is fixedly sleeved on the motor shaft (1), and the first end of the bearing (3) is in contact with the motor shaft (1); The limiting member (4) is fixedly sleeved on the motor shaft (1) and abuts against the second end of the bearing (3) to limit the bearing (3), the first end and the second end being opposite to each other; Wherein, the limiting member (4) is a component having a conductive function, and is in contact with the motor shaft (1) and the housing (2) respectively.
2. The conductive mechanism of the motor according to claim 1, characterized in that: The limiting member (4) comprises a body (41) and at least one conductive unit (42); A through hole (411) is provided inside the body (41), and the motor shaft (1) passes through the through hole (411); One end of the conductive unit (42) is connected to the body (41), and the other end is in contact with the shell (2).
3. The conductive mechanism of the motor according to claim 2, characterized in that: A mounting hole (412) is provided on the outer wall of the body (41), the opening direction of the mounting hole (412) is perpendicular to the opening direction of the through hole (411), and the conductive unit (42) partially extends into the mounting hole (412) to be connected to the body (41).
4. The conductive mechanism of the motor according to claim 3, characterized in that: The number of the mounting holes (412) is multiple, and the multiple mounting holes (412) are spaced and evenly arranged along the circumference of the through hole (411); The limiting member (4) comprises a plurality of the conductive units (42), and each of the conductive units (42) is respectively connected to a corresponding mounting hole (412).
5. The conductive mechanism of the motor according to claim 2, characterized in that: The outer periphery of the body (41) is in the shape of a regular polygon, and each face of the regular polygon is connected to a conductive unit (42).
6. The conductive mechanism of the motor according to claim 2, characterized in that: The shell (2) has a matching cavity (21) inside, the limiting member (4) is located in the matching cavity (21), and one end of the conductive unit (42) away from the body (41) is in contact with the inner wall of the matching cavity (21).
7. The conductive mechanism of the motor according to claim 3, characterized in that: The conductive unit (42) comprises a connecting segment (421) and a conductive segment (422); One end of the connecting section (421) is connected to the mounting hole (412), and the other end is connected to the conductive section (422); The conductive segment (422) is at least partially located outside the mounting hole (412) and comprises a plurality of carbon rods (4221) arranged in an array, wherein the carbon rods (4221) are in contact with the shell (2).
8. The conductive mechanism of the motor according to claim 7, characterized in that: An external thread is provided on one side of the connecting section (421) close to the through hole (411), and an internal thread is provided inside the mounting hole (412), wherein the internal thread matches the external thread.
9. The conductive mechanism of the motor according to claim 4, characterized in that: The limiting member (4) is threadedly connected to the motor shaft (1).
10. A vehicle, characterized in that: The vehicle comprises a conductive mechanism of the motor according to any one of claims 1 to 9.