Motor and automobile
By designing the motor's rotor shaft as a hollow shaft and setting up a flow guide assembly inside it, the shaft current is transmitted to the end cover, which solves the problem of damage to the bearing by shaft current, reduces the occupation of the motor's internal space, and improves the integrated design level of the motor.
Patent Information
- Application Number
- CN202420821907.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-19
- Publication Date
- 2025-05-06
- Estimated Expiration
- 2034-04-19
AI Technical Summary
In existing motors, shaft current caused by uneven magnetic field will flow to the outside through the rotor shaft and bearing, causing electrocorrosion and lubricant degradation, and damage to the bearing. The existing flow diversion structure is usually arranged outside the shaft, occupying the internal space of the motor.
The rotor shaft is designed as a hollow shaft, and a flow guide assembly is installed inside it, which transmits the shaft current to the end cover through the flow guide assembly, thereby preventing the shaft current from entering the bearing and reducing space occupation.
It effectively avoids the damage to the bearing by shaft current, reduces the occupation of the internal space of the motor, and improves the integrated design level of the motor.
Smart Images
Figure CN222839531U_ABST
Abstract
Description
Technical Field
[0001] The present application belongs to the field of motor technology, and specifically relates to motors and automobiles. Background Art
[0002] When the rotor of the motor rotates in the magnetic field, if the magnetic field is uneven, an unbalanced electric potential will be generated on the rotor, causing the current to flow through the rotor shaft and bearings to the ground or other parts of the machine. This flowing current is called shaft current. The existence of shaft current causes many hazards to the bearings, the most direct of which is electrocorrosion. In addition, shaft current may also cause degradation of the lubricating oil, further aggravating bearing damage. Existing solutions usually adopt two strategies: flow-guiding structure and flow-blocking structure. Existing flow-guiding structures are usually set on the outside of the shaft, and this design takes up space inside the motor. Utility Model Content
[0003] An object of the invention of the present application is to provide a motor which can reduce the space occupied by the motor by designing the rotor shaft as a hollow shaft and arranging the flow guide component inside the hollow shaft.
[0004] According to an embodiment of the present application, a first aspect provides a motor, the motor comprising:
[0005] A rotor shaft, wherein the rotor shaft is a hollow shaft;
[0006] an end cover, disposed at one end of the rotor shaft;
[0007] A bearing, wherein the bearing is disposed between the rotor shaft and the end cover;
[0008] A flow guide component is provided, wherein the flow guide component connects the inner wall of the rotor shaft and the end cover, and the flow guide component transmits the shaft current of the rotor shaft to the end cover.
[0009] In one embodiment, the flow guide assembly includes a first flow guide, one end of the first flow guide is connected to the end cover, and the other end of the first flow guide is in contact with the inner wall portion of the rotor shaft.
[0010] In one embodiment, the flow guide assembly further includes a second flow guide body, which is disposed between the first flow guide body and the inner wall of the rotor shaft, and the second flow guide body rotates relative to the first flow guide body and the inner wall of the rotor shaft respectively.
[0011] In one embodiment, a first limiting portion is provided on the inner wall of the rotor shaft, a contact portion and a second limiting portion opposite to the first limiting portion are provided on the side of the first flow guide body facing the first limiting portion, and the second flow guide body is provided at the contact portion of the first limiting portion and is jointly limited by the first limiting portion and the second limiting portion.
[0012] In one embodiment, the contact length between the second flow guide and the inner wall of the rotor shaft is 5 cm to 15 cm, and the length of the contact portion of the first flow guide is greater than the length of the second flow guide.
[0013] In one embodiment, a mounting hole is provided on a side of the end cover facing the shaft body, and the first flow guide is installed in the mounting hole with an interference fit.
[0014] In one embodiment, the second flow guide is connected with the inner wall of the rotor shaft and the first flow guide by a clearance fit.
[0015] In one embodiment, the first flow guide body is made of brass; and / or, a side of the first flow guide body away from the inner wall of the rotor shaft is provided with a plurality of flow guide grooves extending along the axial direction of the rotor shaft.
[0016] In one embodiment, the second flow guide is a needle bearing.
[0017] According to an embodiment of the present application, a second aspect provides a car, comprising the motor.
[0018] In the motor of the present application, when the rotor in the motor is working, the shaft current in the rotor shaft is transmitted to the end cover through the flow guide component arranged between the inner wall of the rotor shaft and the end cover. The transmission path of the shaft current is from the inner wall of the rotor shaft to the flow guide component, and then transmitted to the end cover through the flow guide component. In this way, the risk of the shaft current transmitted by the rotor shaft entering the bearing and damaging the bearing is better avoided. Since the rotor shaft is designed as a hollow shaft in the present application, the flow guide component can be arranged on the inner wall of the rotor shaft, that is, the flow guide component can be hidden and designed inside the rotor shaft. In this way, the internal space of the motor can be further reduced, which is conducive to the integrated design of the motor. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a cross-sectional schematic diagram of a partial structure of a motor in one embodiment of the present application;
[0020] Figure 2 for Figure 1 A partial enlarged schematic diagram in the middle.
[0021] Description of Figure Numbers:
[0022] 100, rotor shaft; 110, first limiting portion; 200, end cover; 210, assembly hole;
[0023] 300, bearings;
[0024] 400, flow guide assembly; 410, first flow guide; 411, contact portion; 412, second limit portion;
[0025] 420. A second conducting body. DETAILED DESCRIPTION
[0026] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.
[0027] It should be noted that the illustrations provided in this embodiment are only used to schematically illustrate the basic concept of the present invention.
[0028] The structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology, and are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportion or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.
[0029] The directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "middle", "longitudinal", "lateral", "horizontal", "inner", "outer", "radial", "circumferential" and the like in this specification are based on the directions or positional relationships shown in the drawings and are only for the convenience of simplifying the description. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.
[0030] As introduced in the background, when the rotor of the motor rotates in the magnetic field, if the magnetic field is uneven, an unbalanced electric potential will be generated on the rotor, causing the current to flow through the rotor shaft and bearings to the ground or other parts of the machine. This flowing current is called shaft current. The existence of shaft current causes various hazards to the bearing, the most direct of which is electrocorrosion. In addition, shaft current may also cause degradation of lubricating oil, further aggravating bearing damage. Two strategies, namely, flow-guiding structure and flow-blocking structure, are generally adopted in existing schemes. The existing flow-guiding structure is arranged on the outside of the shaft, and this design will occupy the space inside the motor. In order to better solve this problem, the researchers in this application proposed a motor, by designing the rotor shaft of the motor as a hollow shaft, designing the flow-guiding component inside the rotor shaft, that is, hiding the flow-guiding component inside the rotor shaft, which can further reduce the space of the motor. The researchers intend to improve the internal integration of the motor through this improvement method.
[0031] like Figure 1 As shown, Figure 1 The figure is a cross-sectional schematic diagram of a partial structure of a motor in an embodiment of the present application. The motor includes: a rotor shaft 100, an end cover 200, a bearing 300 and a flow guide assembly 400, wherein the rotor shaft 100 is an axis arranged in the rotor, and the rotor shaft 100 is designed as a hollow shaft; the end cover 200 and the bearing 300 are used to support the rotor shaft 100, wherein the end cover 200 is connected to the housing of the motor, the bearing 300 is arranged on the end cover 200, and the rotor shaft 100 is connected to the bearing 300; the flow guide assembly 400 is arranged inside the rotor shaft 100, and the flow guide assembly 400 connects the inner wall of the rotor shaft 100 and the end cover 200, wherein the inner wall of the rotor shaft 100 refers to the inner wall produced after the hollow design of the rotor shaft 100. The researchers plan to use the guide component 400 to guide the shaft current on the rotor shaft 100 to the end cover 200, thereby completing the release of the shaft current and reducing the damage of the shaft current to the bearing 300; because the guide component 400 is hidden inside the rotor shaft 100, the internal space of the motor is further reduced, which is more conducive to the integrated design of the motor.
[0032] Specifically, the rotor shaft 100 is a hollow shaft; the end cover 200 is arranged at one end of the rotor shaft 100; the bearing 300 is arranged between the rotor shaft 100 and the end cover 200; the flow guide component 400 connects the inner wall of the rotor shaft 100 and the end cover 200, and the flow guide component 400 transmits the shaft current of the rotor shaft 100 to the end cover 200. It should be noted that the flow guide component 400 connects the inner wall of the rotor shaft 100 and the end cover 200, which means that the flow guide component 400 is at least partially in contact with the rotor shaft 100 and the end cover 200, that is, when the shaft current is released, the flow guide component 400 acts as a medium to transfer the shaft current in the rotor shaft 100 to the end cover 200, and releases the shaft current through the end cover 200. The end cover 200 will be grounded in design, so that the shaft current entering the end cover 200 can be released.
[0033] In this embodiment, when the motor generates shaft current during operation, the shaft current enters the flow guide assembly 400 along the rotor shaft 100, and enters the end cover 200 through the flow guide assembly 400, and is finally released. The shaft current release process can be referred to in Figure 1 In the present embodiment, since the rotor shaft 100 is designed as a hollow shaft, the flow guide assembly 400 is arranged inside the rotor shaft 100, that is, the flow guide assembly 400 is hidden inside the rotor shaft 100. In this way, the space occupied by the motor can be reduced, which is more conducive to the integrated design of the motor.
[0034] Furthermore, in one embodiment, the flow guide assembly 400 includes a first flow guide 410 , one end of the first flow guide 410 is connected to the end cover 200 , and the other end of the first flow guide 410 is in contact with the inner wall portion of the rotor shaft 100 .
[0035] In this embodiment, the first flow guide 410 in the flow guide assembly 400 is a connecting medium between the rotor shaft 100 and the end cover 200, and the shaft current in the rotor shaft 100 can be released to the end cover 200 through the first flow guide 410. In addition, when the first flow guide 410 is connected to the inner wall of the rotor shaft 100, the first flow guide 410 can be hidden in the inner wall of the rotor shaft 100. In this way, compared with the solution of setting the first flow guide 410 on the outer wall of the rotor shaft 100, the space occupied by the motor can be further reduced, which is conducive to the integrated design of the motor. When the first flow guide 410 connects the rotor shaft 100 and the end cover 200, the first flow guide 410 can be realized by mechanical connection.
[0036] Researchers have found that when the first flow guide 410 directly contacts the inner wall of the rotor shaft 100, since the rotor shaft 100 is continuously rotating, the inner part of the rotor shaft 100 contacts the first flow guide 410, and both will be worn, which will affect the mechanical properties of the first flow guide 410 and the rotor shaft 100. In order to better solve this problem, in one embodiment, refer to Figure 1 and Figure 2 As shown, the flow guide assembly 400 further includes a second flow guide 420 , wherein the second flow guide 420 is disposed between the first flow guide 410 and the inner wall of the rotor shaft 100 , and the second flow guide 420 rotates relative to the first flow guide 410 and the inner wall of the rotor shaft 100 .
[0037] In this embodiment, the second flow guide 420 is disposed between the first flow guide 410 and the rotor shaft 100 , and the wear between the first flow guide 410 and the rotor shaft 100 is reduced by rotating the second flow guide 420 relative to the inner wall of the rotor shaft 100 and relative to the outer wall of the first flow guide 410 .
[0038] In one embodiment, the second flow conductor 420 is a needle bearing. In this embodiment, the researchers use the second flow conductor 420 as a needle bearing. Since the needle bearing has no inner and outer ring structure, the inner wall of the rotor shaft 100 can be regarded as the outer ring of the needle bearing, and the first flow conductor 410 can be regarded as the inner ring of the needle bearing. In this way, on the one hand, the shaft current can be transferred from the rotor shaft 100 to the first flow conductor 410 through the second flow conductor 420; on the other hand, the wear between the rotor shaft 100 and the first flow conductor 410 can also be reduced.
[0039] Furthermore, the researchers considered that when the second flow guide 420 rotates relative to the inner wall of the rotor shaft 100 and the second flow guide 420, the second flow guide 420 may move out from between the first flow guide 410 and the rotor shaft 100. In order to better solve this problem, in one embodiment, refer to Figure 2As shown, the inner wall of the rotor shaft 100 is provided with a first limiting portion 110, the first flow guide 410 is provided with a contact portion 411 and a second limiting portion 412 opposite to the first limiting portion 110 on the side facing the first limiting portion 110, and the second flow guide 420 is provided at the contact portion 411 of the first limiting portion 110 and is jointly limited by the first limiting portion 110 and the second limiting portion 412.
[0040] In this embodiment, the shaft current of the rotor shaft 100 enters the contact portion 411 of the first body guide 410 along the second body guide 420, and then enters the end cover 200 along the first body guide 410. Since the second body guide 420 is disposed between the first body guide 410 and the inner wall of the rotor shaft 100, it is also limited by the first limiting portion 110 of the rotor shaft 100 and the second limiting portion 412 of the first body guide 410 that are relatively disposed, that is, a relatively closed space is formed between the rotor shaft 100 and the first body guide 410, so that the second body guide 420 can be limited, thereby preventing the second body guide 420 from moving out from between the first body guide 410 and the rotor shaft 100.
[0041] In one embodiment, the length of the second flow guide 420 in contact with the inner wall of the rotor shaft 100 is 5 cm to 15 cm; in addition, the length of the contact portion 411 of the first flow guide 410 is greater than the length of the second flow guide 420 .
[0042] In this embodiment, when optimizing the length of the rotor shaft 100 in contact with the inner wall, the researchers believe that when the length of the second body conductor 420 is set to 5 cm to 15 cm, it can ensure that the current is evenly distributed when the shaft current is transmitted, avoiding the generation of hot spots. In addition, the length of the contact portion 411 of the first body conductor 410 is greater than the length of the second body conductor 420. The reason is that such a design can ensure that there is enough contact area between the first body conductor 410 and the second body conductor 420 to optimize the transmission and distribution of the current; this can not only further reduce the contact resistance, but also reduce the local overheating problem caused by current concentration.
[0043] In one embodiment, see Figure 1 As shown, a mounting hole 210 is provided on one side of the end cover 200 facing the rotor shaft 100 , and the first flow guide 410 is installed in the mounting hole 210 by interference fit.
[0044] In this embodiment, the researchers set an assembly hole 210 on the end cover 200, and installed the first flow guide 410 in the assembly hole 210 by interference fit. The installation method of the first flow guide 410 and the assembly hole 210 can significantly enhance the fixation of the first flow guide 410 in the end cover 200, reduce vibration and relative displacement during operation, and provide higher mechanical stability. It should be noted that when the first flow guide 410 is installed in cooperation with the assembly hole 210 of the end cover 200, the first flow guide 410 is also shaft-shaped.
[0045] In one embodiment, the second flow guide 420 is connected with the inner wall of the rotor shaft 100 and the second flow guide 420 by clearance fit.
[0046] In this embodiment, the second flow guide 420 is connected to the inner wall of the rotor shaft 100 and the first flow guide 410 by a clearance fit. This connection method can reduce the wear between the second flow guide 420 and the rotor shaft 100 and the first flow guide 410. In addition, since shaft current is transmitted between the second flow guide 420 and the rotor shaft 100 and the first flow guide 410, the clearance fit method reserves deformation space for thermal expansion during the process of transmitting shaft current.
[0047] In one embodiment, the first flow guide 410 is made of brass; and / or, a side of the first flow guide 410 away from the inner wall of the rotor shaft 100 is provided with a plurality of flow guide grooves extending along the axial direction of the rotor shaft 100 .
[0048] In this embodiment, the researchers selected brass as the material of the first flow guide 410 because brass has a high electrical conductivity and is suitable for current conduction applications. Brass can effectively transmit current and reduce resistance losses. In addition, the reason for setting a guide groove on the side of the first flow guide 410 away from the inner wall of the rotor shaft 100 is that lubricating oil is required in the rotor shaft 100 to cool the bearing 300 and other structures. By setting a guide groove in the first flow guide 410, the lubricating oil can be guided, thereby diverting the lubricating oil to a preset area.
[0049] The present application also proposes a car, in which the motor mentioned above is included. In this embodiment, since the flow guide assembly 400 of the motor is hidden in the rotor shaft 100, the motor has a higher degree of integration. After the motor is used in the car, the space occupied by the motor can be further reduced, which is conducive to a more reasonable allocation of the car space.
[0050] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0051] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.
Claims
1. A motor, characterized in that: The motor comprises: A rotor shaft (100), wherein the rotor shaft (100) is a hollow shaft; An end cover (200) is arranged at one end of the rotor shaft (100); A bearing (300), wherein the bearing (300) is arranged between the rotor shaft (100) and the end cover (200); A flow guide component (400) is provided, wherein the flow guide component (400) connects the inner wall of the rotor shaft (100) and the end cover (200), and the flow guide component (400) transmits the shaft current of the rotor shaft (100) to the end cover (200).
2. The motor according to claim 1, characterized in that: The flow guide assembly (400) comprises a first flow guide (410), one end of the first flow guide (410) is connected to the end cover (200), and the other end of the first flow guide (410) is in contact with the inner wall portion of the rotor shaft (100).
3. The motor according to claim 2, characterized in that: The flow guide assembly (400) further comprises a second flow guide (420), wherein the second flow guide (420) is arranged between the first flow guide (410) and the inner wall of the rotor shaft (100), and the second flow guide (420) rotates relative to the first flow guide (410) and the inner wall of the rotor shaft (100), respectively.
4. The motor according to claim 3, characterized in that: The inner wall of the rotor shaft (100) is provided with a first limiting portion (110); the first flow guide (410) is provided with a contact portion (411) and a second limiting portion (412) opposite to the first limiting portion (110) on a side facing the first limiting portion (110); the second flow guide (420) is provided at the contact portion (411) of the first limiting portion (110) and is limited by both the first limiting portion (110) and the second limiting portion (412).
5. The motor according to claim 4, characterized in that: The length of the second flow guide (420) in contact with the inner wall of the rotor shaft (100) is 5 cm to 15 cm, and the length of the contact portion (411) of the first flow guide (410) is greater than the length of the second flow guide (420).
6. The motor according to claim 3, characterized in that: A mounting hole (210) is provided on a side of the end cover (200) facing the rotor shaft (100), and the first flow guide (410) is installed in the mounting hole (210) by interference fit.
7. The motor according to claim 6, characterized in that: The second flow guide (420) is connected to the inner wall of the rotor shaft (100) and the first flow guide (410) in a clearance fit.
8. The motor according to claim 2, characterized in that: The material of the first flow guide (410) is brass; and / or a plurality of flow guide grooves extending along the axial direction of the rotor shaft (100) are provided on a side of the first flow guide (410) facing away from the inner wall of the rotor shaft (100).
9. The motor according to claim 3, characterized in that: The second flow guide (420) is a needle bearing.
10. An automobile, characterized in that: The vehicle comprises the motor according to any one of claims 1 to 9.