Rotor assembly, motor and vehicle

Abstract

The utility model relates to a rotor assembly, a motor and a vehicle, the rotor assembly comprises a rotating shaft and a rotor core, the rotor core sleeves the rotating shaft, at least one of the rotor core and the rotating shaft is provided with an insertion part, at least the other one is provided with an insertion matching part, the insertion part is inserted into the insertion matching part, and the insertion part is in interference fit with the insertion matching part. According to the rotor assembly, the matching degree of the rotating shaft and the rotor core can be improved through the interference fit of the insertion part and the insertion matching part between the rotating shaft and the rotor core, and the condition that the rotor core generates displacement in the radial direction or the axial direction of the rotating shaft can be reduced, so that vibration generated when the motor rotor rotates at a high speed is reduced, and the performance of the motor is optimized.

Description

Technical Field

[0001] The present disclosure relates to the technical field of vehicles and motors thereof, and in particular, to a rotor assembly, a motor and a vehicle. Background Art

[0002] The motor rotor generally includes a motor shaft and a rotor core. The rotor core is usually formed by stacking multiple rotor punchings. When the motor rotor rotates at high speed, the rotor core is easily pulled by the high-speed centrifugal phenomenon, causing relative displacement in the radial direction with the motor shaft and deviating from the original position, thereby causing the motor rotor to have a large imbalance and produce greater vibration. Utility Model Content

[0003] The purpose of the present disclosure is to provide a rotor assembly, a motor and a vehicle, which can improve the fit between the shaft and the rotor core, reduce the radial or axial displacement of the rotor core along the shaft, reduce the vibration generated by the motor rotor when rotating at high speed, and at least partially solve the above-mentioned technical problems.

[0004] In order to achieve the above-mentioned purpose, the first aspect of the present disclosure provides a rotor assembly, including a rotating shaft and a rotor core, wherein the rotor core is sleeved on the rotating shaft, at least one of the rotor core and the rotating shaft is provided with a plug-in portion, and at least the other is provided with a plug-in fitting portion, wherein the plug-in portion is plugged into the plug-in fitting portion, and the plug-in portion and the plug-in fitting portion are interference fit.

[0005] Optionally, the rotating shaft has an outer circumferential wall, the rotor core has an inner circumferential wall, and the outer circumferential wall and the inner circumferential wall are transitionally matched.

[0006] Optionally, the rotating shaft has an outer peripheral wall, the rotor core has an inner peripheral wall, the plug-in portion is arranged on at least one of the outer peripheral wall and the inner peripheral wall, and the plug-in fitting portion is arranged on at least the other of the outer peripheral wall and the inner peripheral wall.

[0007] Optionally, the plug-in portion includes a key structure, and the plug-in mating portion includes a key slot.

[0008] Optionally, the keyway includes a bottom surface, the key structure includes a top surface, the bottom surface and the top surface are arranged opposite to each other in a radial direction of the rotating shaft or the rotor core, and the bottom surface and the top surface are interference fit.

[0009] Optionally, the interference between the bottom surface and the top surface is 0.07-0.13 mm.

[0010] Optionally, the keyway further includes two first side surfaces located on both sides of the bottom surface, and the key structure further includes two second side surfaces respectively opposite to the two first side surfaces, and the first side surfaces and the opposite second side surfaces are interference fit, transition fit, or clearance fit.

[0011] Optionally, the keyway is arranged on the rotating shaft, and the depth of the keyway is not greater than 1 / 3 of the diameter of the rotating shaft.

[0012] Optionally, the depth of the keyway is 5 mm.

[0013] Optionally, the width of the keyway is 6 mm.

[0014] Optionally, the number of the plug-in portion and the number of the plug-fitting portion are both plural, and the plurality of the plug-in portions and the plurality of the plug-fitting portions are respectively arranged at intervals along the circumferential direction of the rotating shaft or the rotor core.

[0015] Optionally, the number of the plug-in parts and the plug-fitting parts are both two, the two plug-in parts are spaced 180° apart in the circumferential direction of the rotor core or the rotating shaft, and the two plug-fitting parts are spaced 180° apart in the circumferential direction of the rotating shaft or the rotor core.

[0016] Optionally, the rotor core includes one or more rotor punchings stacked in the axial direction, and a connecting portion is provided on the rotor punching, and one or more of the connecting portions stacked in the axial direction form the plug-in portion or the plug-fitting portion.

[0017] Optionally, the connecting portion is constructed as a protrusion protruding from the rotor punching sheet, and one or more of the protrusions arranged in a stacked manner form the plug-in portion; or, the connecting portion is constructed as a groove recessed in the rotor punching sheet, and one or more of the grooves arranged in a stacked manner along the axial direction form the plug-in fitting portion.

[0018] A second aspect of the present disclosure provides an electric motor comprising a rotor assembly as described in any of the above schemes.

[0019] A third aspect of the present disclosure provides a vehicle comprising the above-mentioned motor.

[0020] Through the above technical scheme, when the rotor core and the rotating shaft are assembled, the fit between the rotor core and the rotating shaft can be improved by means of interference fit between the plug-in part and the plug-in fitting part. When the rotor assembly rotates at a high speed, the rotor core can also be tightly fitted with the rotating shaft through the interference fit between the plug-in part and the plug-in fitting part, thereby reducing the radial or axial displacement of the rotor core along the rotating shaft, and also reducing the imbalance of the rotor core on the rotating shaft, so as to reduce the vibration generated by the rotor assembly when it rotates at a high speed, thereby optimizing the performance of the motor.

[0021] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0023] Figure 1 is a schematic structural diagram of a rotor assembly provided in an exemplary embodiment of the present disclosure;

[0024] Figure 2 is a front view showing the cooperation between a rotating shaft and a rotor core provided in an exemplary embodiment of the present disclosure;

[0025] Figure 3 yes Figure 2 A partial enlarged view of position A in the middle;

[0026] Figure 4 is a schematic structural diagram of a rotating shaft provided in an exemplary embodiment of the present disclosure;

[0027] Figure 5 Schematic diagram of the structure of a rotor core provided in an exemplary embodiment of the present disclosure.

[0028] Description of Reference Numerals

[0029] 1-shaft; 101-outer peripheral wall; 110-plug-in fitting part; 111-keyway; 111a-bottom surface; 111b-first side surface; 2-rotor core; 2a-rotor punching sheet; 2a1-connecting part; 201-inner peripheral wall; 210-plug-in part; 211-key structure; 211a-top surface; 211b-second side surface. DETAILED DESCRIPTION

[0030] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0031] In the present disclosure, unless otherwise specified, directional words such as "inside" and "outside" refer to the inside and outside relative to the outline of the structure or component itself; "first, second" and the like are intended to distinguish one element from another and have no order or importance. In addition, the same figure marks in different reference drawings represent the same elements.

[0032] In a first aspect of the present disclosure, a rotor assembly is provided, referring to Figures 1 to 5 As shown, the rotor assembly includes a rotating shaft 1 and a rotor core 2, the rotor core 2 is sleeved on the rotating shaft 1, at least one of the rotor core 2 and the rotating shaft 1 is provided with a plug-in portion 210, and at least the other is provided with a plug-in fitting portion 110, the plug-in portion 210 is plugged into the plug-in fitting portion 110, and the plug-in portion 210 and the plug-in fitting portion 110 are interference fit.

[0033] Through the above-mentioned method, that is, the rotor assembly provided by the present invention, when the rotor core 2 and the rotating shaft 1 are assembled, the fit between the rotor core 2 and the rotating shaft 1 can be improved by means of interference fit between the plug-in portion 210 and the plug-in fitting portion 110. When the rotor assembly rotates at a high speed, the rotor core 2 can also be tightly fitted with the rotating shaft 1 through the interference fit between the plug-in portion 210 and the plug-in fitting portion 110, thereby reducing the radial or axial displacement of the rotor core 2 along the rotating shaft 1, and also reducing the imbalance of the rotor core 2 on the rotating shaft 1, so as to reduce the vibration generated by the rotor assembly when rotating at a high speed and optimize the performance of the motor.

[0034] It should be noted that the arrangement of the plug-in portion 210 and the plug-in mating portion 110 can be arbitrarily appropriate, and the present disclosure does not make any specific limitation on this. For example, when the plug-in portion 210 is arranged on the rotor core 2, the plug-in mating portion 110 mating with the plug-in portion 210 can be arranged on the rotating shaft 1; when the plug-in portion 210 is arranged on the rotating shaft 1, the plug-in mating portion 210 mating with the plug-in portion 210 can be arranged on the rotor core 2; when the rotor core 2 is provided with both the plug-in portion 210 and the plug-in mating portion 110, the rotating shaft is also provided with the plug-in mating portion 110 and the plug-in portion 210 accordingly. At the same time, the positions of the plug-in portion 210 and the plug-in fitting portion 110 on the rotor core 2 and the rotating shaft 1 can also be arbitrarily appropriate. For example, the plug-in portion 210 and the plug-in fitting portion 110 can both be arranged at the ends of the rotor core 2 and the rotating shaft 1 for plug-in fitting, or can also be arranged on the inner wall of the rotor core 2 and the outer wall of the rotating shaft 1 for plug-in fitting.

[0035] In the related art, in order to reduce the vibration generated by the rotating shaft 1 and the rotor core 2 when rotating at high speed, the outer wall surface of the rotating shaft 1 and the inner wall surface of the rotor core 2 are usually made to have an interference fit when the rotor core 2 is sleeved on the rotating shaft 1, and the vibration is reduced by increasing the interference. However, the method of reducing vibration in this way will cause the rotor core 2 to have a large deformation when the rotating shaft 1 and the rotor core 2 are assembled. The deformation may cause the gap of the rotor core 2 to increase. For the rotor core 2 with an oil circuit design, it is easy for oil to leak into the air gap of the motor and cause the motor to overheat. Therefore, reference can be made to Figures 1 to 5As shown, the shaft 1 has an outer peripheral wall 101, and the rotor core 2 has an inner peripheral wall 201. The outer peripheral wall 101 and the inner peripheral wall 201 are transitionally matched. In this matching mode, the transitional fit between the outer peripheral wall 101 of the shaft 1 and the inner peripheral wall 201 of the rotor core 2 can reduce the deformation of the rotor core 2, thereby reducing the occurrence of oil leakage. On this basis, the interference fit between the plug-in portion 210 and the plug-in fitting portion 110 can reduce the vibration generated by the rotor assembly when rotating at high speed. Exemplarily, when the rotor core 2 and the shaft 1 are assembled, the diameter of the inner wall surface of the rotor core 2 can be made equal to the diameter of the outer wall surface of the shaft 1 to achieve the transitional fit between the rotor core 2 and the shaft 1. It can be understood that the diameter of the inner wall surface of the rotor core 2 is equal to the diameter of the outer wall surface of the shaft 1, which is a design target in the design stage, and its protection range should include the tolerance caused by the manufacturing process of the rotor core 2 and the shaft 1.

[0036] In some embodiments, reference Figures 1 to 5 As shown, the rotating shaft 1 has an outer peripheral wall 101, the rotor core 2 has an inner peripheral wall 201, the plug-in portion 210 is arranged on at least one of the outer peripheral wall 101 and the inner peripheral wall 201, and the plug-in fitting portion 110 is arranged on at least the other of the outer peripheral wall 101 and the inner peripheral wall 201. In this way, the plug-in portion 210 and the plug-in fitting portion 110 are arranged on the inner peripheral wall 201 and the outer peripheral wall 201 respectively. When the rotor assembly rotates at a high speed, the rotating shaft 1 and the rotor core 2 can be more closely matched, that is, the two can rotate synchronously more stably, thereby reducing the vibration generated by the rotating shaft 1 and the rotor core 2 when the high-speed rotation occurs. In addition, it should be noted that the arrangement of the plug-in portion 210 and the plug-in fitting portion 110 can be arbitrarily suitable, for example, it can refer to Figure 3 As shown, when the plug-in portion 210 is arranged on the inner peripheral wall 201, the plug-in mating portion 110 can be arranged on the outer peripheral wall 101. Conversely, in an embodiment not shown in the figure, when the plug-in portion 210 is arranged on the outer peripheral wall 101, the plug-in mating portion 110 can be arranged on the inner peripheral wall 101, or, when the plug-in portion 210 and the plug-in mating portion 110 are provided on the outer peripheral wall 101, the inner peripheral wall 201 is correspondingly provided with the plug-in mating portion 110 and the plug-in portion 210. The present disclosure does not make any specific limitation on this.

[0037] In some embodiments, reference Figures 1 to 5 As shown, the plug-in portion 210 includes a key structure 211, and the plug-in mating portion 110 includes a key slot 111. In this way, the mating mode of the key structure 211 and the key slot 111 can more stably matingly connect the rotating shaft 1 and the rotor core 2, and can also more stably transmit the torque.

[0038] In addition, in an embodiment not shown in the figures, in order to further improve the close fit between the rotating shaft 1 and the rotor core 2, the plug-in portion 210 and the plug-in mating portion 110 may also include other components that can achieve plug-in fit. For example, the plug-in portion 210 may include any suitable protruding structure such as a locating pin or a locating column, and the plug-in mating portion 110 may include a groove structure that is plug-fitted with a protruding structure such as a locating pin or a locating column, etc. The present disclosure does not make specific limitations on this.

[0039] In some embodiments, reference Figures 1 to 5 As shown, the key slot 111 includes a bottom surface 111a, the key structure 211 includes a top surface 211a, the bottom surface 111a and the top surface 211a are arranged opposite to each other along the radial direction of the rotating shaft 1 or the rotor core 2, and the bottom surface 111a and the top surface 211a are interference fit. In this way, the top surface 211a of the key structure 211 and the bottom surface 111a of the key slot 111 are interference fit, which can make it easier to assemble the rotating shaft 1 and the rotor core 2. At the same time, the rotating shaft 1 and the rotor core 2 can be more tightly fixed after assembly.

[0040] In some embodiments, reference Figures 1 to 5 As shown, the interference between the bottom surface 111a and the top surface 211a is 0.07-0.13mm. In this way, when the shaft 1 and the rotor core 2 are assembled, the range of the interference can ensure that the rotor core 2 and the shaft 1 are always in contact, thereby ensuring that the two can rotate synchronously in the circumferential direction around the axial direction of the shaft 1, thereby reducing the possibility of the rotor core 2 being separated from the original position of the shaft 1 and moving radially, and reducing the vibration of the rotor assembly when rotating at high speed.

[0041] In a preferred embodiment, the interference between the bottom surface 111a and the top surface 211a can be 0.1 mm. In an embodiment with this interference size, the rotor core 2 and the rotating shaft 1 can be more closely matched, and the vibration of the rotor assembly during high-speed rotation can be minimized.

[0042] In some embodiments, reference Figures 1 to 5 As shown, the key slot 111 also includes two first side surfaces 111b located on both sides of the bottom surface 111a, and the key structure 211 also includes two second side surfaces 211b respectively opposite to the two first side surfaces 111b, and the first side surface 111b and the opposite second side surface 211b are interference fit or transition fit or clearance fit. In this way, when the key slot 111 and the key structure 211 are plugged into each other, the first side surface 111b and the second side surface 211b can also be matched in any suitable way among the above-mentioned ways, thereby improving the convenience of the key slot 111 and the key structure 211, and also improving the stability of the synchronous rotation after the key slot 111 and the key structure 211 are matched.

[0043] In some embodiments, reference Figures 1 to 5 As shown, the keyway 111 is arranged on the shaft 1, and the depth of the keyway 111 is not greater than 1 / 3 of the diameter of the shaft 1. In this way, the key structure 211 and the keyway 111 can be assembled more conveniently, and after the assembly, the key structure 211 can also be more tightly connected to the keyway 111. When the shaft 1 and the rotor core 2 rotate synchronously, the tightly connected key 211 and the keyway 111 can also make the shaft 1 and the rotor core 2 rotate synchronously more stably, thereby reducing the occurrence of the rotor core 2 detaching from the shaft 1. In addition, the structural strength of the shaft 1 itself can also be guaranteed.

[0044] In some embodiments, reference Figures 1 to 5 As shown, the depth of the keyway 111 is 5 mm and the width of the keyway is 6 mm. In this way, the keyway 111 can have a good and effective fit with the key structure 211.

[0045] In some embodiments, reference Figures 1 to 5 As shown, there are multiple plug-in parts 210 and multiple plug-in fitting parts 110, and the multiple plug-in parts 210 and multiple plug-in fitting parts 110 are arranged at intervals along the circumference of the rotating shaft 1 or the rotor core 2. In this way, when the rotating shaft 1 and the rotor core 2 rotate synchronously, the multiple plug-in parts 210 and the multiple plug-in fitting parts 110 can be plugged and matched one by one, so that the rotor core 2 is less likely to be separated from the rotating shaft 1, and the rotor core 2 can be more stably rotated synchronously with the rotating shaft 1, so as to reduce the vibration of the rotor assembly during high-speed rotation.

[0046] In some embodiments, reference Figures 1 to 5 As shown, the number of the plug-in parts 210 and the plug-in fitting parts 110 are both two, and the two plug-in parts 210 are spaced 180° apart in the circumferential direction of the rotor core 2 or the shaft 1, and the two plug-in fitting parts 110 are spaced 180° apart in the circumferential direction of the shaft 1 or the rotor core 2. In this way, the two plug-in parts 210 and the two plug-in fitting parts 110 are evenly spaced at 180°, so that the shaft 1 and the rotor core 2 can rotate more balanced when rotating synchronously.

[0047] In some embodiments, reference Figures 1 to 5 As shown, the rotor core 2 includes one or more rotor punchings 2a stacked in the axial direction, and a connecting portion 2a1 is provided on the rotor punching 2a. The one or more connecting portions 2a1 stacked in the axial direction form a plug-in portion 210 or a plug-in fitting portion 110. In this way, when the number of rotor punchings 2a is multiple, the multiple rotor punchings 2a can form a plug-in portion 210 or a plug-in fitting portion 110 through multiple connecting portions 2a1 to be plug-fitted with the rotating shaft 1. It should be noted that in Figure 1In the given embodiment, the number of rotor punchings 2a is one. In an embodiment not shown in the drawings, the number of rotor punchings 2a may be multiple. Multiple rotor punchings 2a may be stacked and sleeved on the rotating shaft 1. Multiple rotor punchings 2a may rotate synchronously with the rotating shaft 1.

[0048] In some embodiments, reference Figures 1 to 5 As shown, the connection part 2a1 is constructed as a protrusion protruding from the rotor punching 2a1, and one or more stacked protrusions form a plug-in part 210; or, the connection part 2a1 is constructed as a groove recessed in the rotor punching 2a, and one or more grooves stacked along the axial direction form a plug-in fitting part 110. In this way, when the connection part 2a1 is a protrusion, the protrusions on the multiple rotor punchings 2a1 form the plug-in fitting part 210, and the plug-in fitting part 110 is provided on the rotating shaft 1; when the connection part 2a1 is a groove, the grooves on the multiple rotor punchings 2a1 form the plug-in fitting part 110, and the plug-in fitting part 210 is provided on the rotating shaft 1. The appropriate structural form can be selected according to the actual assembly method, and the present disclosure does not make specific limitations on this.

[0049] According to a second aspect of the present disclosure, a motor is provided, which includes the rotor assembly mentioned in the above specific embodiments, and the rotor assembly has all the beneficial effects in the above specific embodiments, wherein the motor can be any suitable type of motor such as a synchronous motor or an asynchronous motor.

[0050] According to a third aspect of the present disclosure, a vehicle is provided, which includes the motor mentioned in the above specific embodiments, and the motor has the beneficial effects in the above specific embodiments, wherein the vehicle can be a new energy vehicle or a fuel vehicle, etc.

[0051] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0052] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0053] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A rotor assembly, characterized in that: It includes a rotating shaft and a rotor core, wherein the rotor core is sleeved on the rotating shaft, at least one of the rotor core and the rotating shaft is provided with a plug-in portion, and at least the other is provided with a plug-in fitting portion, wherein the plug-in portion is plugged into the plug-in fitting portion, and the plug-in portion and the plug-in fitting portion are interference fit.

2. The rotor assembly according to claim 1, characterized in that The rotating shaft has an outer peripheral wall, and the rotor core has an inner peripheral wall, and the outer peripheral wall and the inner peripheral wall are transitionally matched.

3. The rotor assembly according to claim 1, characterized in that: The rotating shaft has an outer peripheral wall, the rotor core has an inner peripheral wall, the plug-in portion is arranged on at least one of the outer peripheral wall and the inner peripheral wall, and the plug-in fitting portion is arranged on at least the other of the outer peripheral wall and the inner peripheral wall.

4. The rotor assembly according to claim 3, characterized in that: The plug-in portion includes a key structure, and the plug-fitting portion includes a keyway.

5. The rotor assembly according to claim 4, characterized in that: The key slot includes a bottom surface, the key structure includes a top surface, the bottom surface and the top surface are arranged opposite to each other in a radial direction of the rotating shaft or the rotor core, and the bottom surface and the top surface are interference fit.

6. The rotor assembly according to claim 5, characterized in that The interference between the bottom surface and the top surface is 0.07-0.13 mm.

7. The rotor assembly according to claim 5, characterized in that: The keyway further includes two first side surfaces located on both sides of the bottom surface, and the key structure further includes two second side surfaces respectively opposite to the two first side surfaces, and the first side surfaces are interference fit, transition fit, or clearance fit with the opposite second side surfaces.

8. The rotor assembly according to claim 4, characterized in that The keyway is arranged on the rotating shaft, and the depth of the keyway is not greater than 1 / 3 of the diameter of the rotating shaft.

9. The rotor assembly according to claim 8, characterized in that The depth of the keyway is 5 mm.

10. The rotor assembly according to claim 9, characterized in that The width of the keyway is 6 mm.

11. The rotor assembly according to claim 1, characterized in that There are multiple plug-in parts and multiple plug-in fitting parts, and the multiple plug-in parts and the multiple plug-in fitting parts are respectively arranged at intervals along the circumferential direction of the rotating shaft or the rotor core.

12. The rotor assembly according to claim 1, characterized in that The number of the plug-in parts and the plug-fitting parts are both two, the two plug-in parts are spaced 180° apart in the circumferential direction of the rotor core or the rotating shaft, and the two plug-fitting parts are spaced 180° apart in the circumferential direction of the rotating shaft or the rotor core.

13. The rotor assembly according to any one of claims 1 to 12, characterized in that: The rotor core includes one or more rotor punchings stacked in the axial direction, and a connecting portion is provided on the rotor punching. One or more connecting portions stacked in the axial direction form the plug-in portion or the plug-in fitting portion.

14. The rotor assembly according to claim 13, characterized in that The connecting portion is configured as a protrusion protruding from the rotor sheet, and one or more protrusions arranged in a stacked manner form the plug-in portion; or, The connecting portion is configured as a groove recessed in the rotor punching sheet, and one or more grooves stacked in the axial direction form the plug-in fitting portion.

15. A motor, characterized in that: Comprising a rotor assembly as described in any one of claims 1-14.

16. A vehicle, characterized in that: Comprising the motor as claimed in claim 15.

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