A rotor assembly, electric machine, and vehicle

Abstract

This article provides a rotor assembly, a motor, and a vehicle. The rotor assembly includes a rotor core and a rotor shaft, with the rotor core sleeved on the outer periphery of the rotor shaft. The rotor shaft includes a shaft body and an oil passage. The shaft body includes an oil inlet section and a mating section. The oil inlet section has an axially extending oil inlet channel. The rotor core is sleeved on the outer periphery of the mating section, and the mating section has an oil inlet cavity. The oil inlet channel communicates with the oil inlet cavity. The oil passage is disposed on the side wall of the mating section and communicates with the oil inlet cavity. The oil passage penetrates the side wall of the mating section, and at least a portion of the inner surface of the rotor core is exposed to the oil passage. This allows the cooling and lubricating oil passing through the rotor shaft to flow through the oil passage to the inner surface of the rotor core, thereby significantly improving the cooling and lubrication efficiency of the rotor assembly.

Description

Technical Field

[0001] This article relates to, but is not limited to, the field of vehicle technology, and in particular to a rotor assembly, an electric motor, and a vehicle. Background Technology

[0002] As one of the core components for the power output of electric vehicles, electric motors are required to have high power density, high torque density, high system efficiency, as well as lightweight, low cost and better mass production processability, in order to meet users' requirements for high performance and low cost of electric and hybrid vehicles.

[0003] Cooling and lubrication are crucial for electric motors, especially high-performance motors. High-performance motors generate significant heat, requiring cooling and lubrication to reduce their operating temperature to a manageable range for their components. Taking an AC asynchronous motor as an example, the main heat-generating components are the stator windings, stator core, rotor core, and permanent magnets. Currently, automotive motor cooling and lubrication technologies primarily employ three methods: air cooling, water cooling, and oil cooling, with oil cooling being the dominant method for high-performance motors. While there are numerous and relatively mature cooling and lubrication solutions for motor stator assemblies, there are fewer solutions for rotor assemblies, particularly efficient ones.

[0004] The current mainstream cooling and lubrication solution for motor rotor assemblies mainly involves using an oil pump to introduce cooling and lubricating oil into the hollow rotor shaft. The oil then flows through oil holes in the shaft into oil holes in the end pressure plates, and finally into the rotor core's oil holes to cool and lubricate the rotor core. The oil then splashes through the pressure plates' oil holes onto the stator windings at the stator ends under centrifugal force, further cooling and lubricating them. This cooling and lubrication solution suffers from low efficiency, failing to meet the requirements of high-performance motors.

[0005] It should be noted that the above content falls within the inventor's technical knowledge and does not necessarily constitute prior art. Summary of the Invention

[0006] The purpose of this application is to provide a rotor assembly, an electric motor, and a vehicle that significantly improves the cooling and lubrication efficiency of the rotor assembly.

[0007] The technical solution of this application embodiment is as follows:

[0008] A rotor assembly includes a rotor core and a rotor shaft, the rotor core being sleeved on the outer periphery of the rotor shaft; the rotor shaft includes a shaft body and an oil passage groove; the shaft body includes an oil inlet section and a mating section, the oil inlet section having an axially extending oil inlet channel, the rotor core being sleeved on the outer periphery of the mating section, the mating section having an oil inlet cavity, the oil inlet channel communicating with the oil inlet cavity, the oil passage groove being disposed on the side wall of the mating section, the oil passage groove communicating with the oil inlet cavity, the oil passage groove penetrating the side wall of the mating section, at least a portion of the inner surface of the rotor core being exposed to the oil passage groove, so that cooling lubricating oil passing through the rotor shaft can be guided to the inner surface of the rotor core through the oil passage groove.

[0009] By arranging oil grooves on the mating section of the rotor shaft opposite to the rotor core, at least part of the inner surface of the rotor core is exposed to the oil grooves, so that the cooling lubricating oil flowing in from the oil inlet channel can be directly guided to the inner surface of the rotor core, thereby optimizing the flow path of the cooling lubricating oil as a whole and effectively improving the cooling and lubrication efficiency of the rotor assembly.

[0010] In some exemplary embodiments, a plurality of oil passage grooves are evenly spaced along the circumference of the shaft, the oil passage grooves penetrate the mating section radially, and the oil passage grooves extend along the axial direction of the shaft.

[0011] Multiple oil grooves are evenly spaced along the circumference of the shaft, and the oil grooves penetrate the mating section radially, making the mating section of the shaft have a hollow design. This reduces the weight of the rotor shaft and increases the flow of oil, thereby improving the efficiency of cooling and lubrication.

[0012] In some exemplary embodiments, the diameter of the mating section is larger than the diameter of the oil inlet section, the oil inlet section and the mating section form a stepped structure, and the wall thickness of the stepped structure is greater than the wall thickness of the oil inlet section.

[0013] By segmenting and differentiating the rotor shaft design, the overall structural layout is optimized. This reduces the weight of the rotor shaft while still meeting the motor's requirements for the diameter of the mating area between the rotor shaft and the rotor core, thus ensuring optimal transmission performance. Furthermore, designing the oil inlet section and the mating section as stepped sections effectively simplifies the manufacturing process and reduces manufacturing costs.

[0014] In some exemplary embodiments, the shaft body is an integral structure, the shaft body is a hollow shaft, and the oil groove is a hollow structure formed in the shaft body.

[0015] By optimizing the overall structure of the oil groove and the shaft, the shaft can be obtained by integral molding, which reduces the complexity of the manufacturing process and improves the manufacturing precision of the rotor shaft.

[0016] In some exemplary embodiments, the inner wall of the oil inlet channel is provided with a spiral groove, and the rotation direction of the spiral groove is the same as the rotation direction of the rotor shaft.

[0017] By setting spiral grooves on the inner wall of the oil inlet channel, the cooling lubricating oil can be guided to a certain extent, reducing the velocity loss of the cooling lubricating oil during the flow process and reducing the cost of cooling lubrication.

[0018] In some exemplary embodiments, the rotor shaft further includes an oil outlet section having an oil outlet channel, the oil outlet channel being coaxially arranged with the oil inlet channel, and the oil outlet channel communicating with the oil inlet channel through the oil inlet cavity.

[0019] By setting up an oil outlet channel that is connected to the oil inlet channel, other components mounted on the rotor shaft can be cooled and lubricated, thereby improving the cooling and lubrication efficiency.

[0020] In some exemplary embodiments, the inner wall of the rotor core is provided with one or more first flow guiding grooves extending along the axial direction of the rotor core. The first flow guiding grooves penetrate both ends of the rotor core and their openings face the inner cavity of the rotor core. The rotor core and the rotor shaft form a flow passage at the first flow guiding grooves, and the flow passages communicate with the oil inlet cavity.

[0021] After the cooling lubricating oil comes out of the rotor shaft, it flows through the first guide groove set on the inner wall of the rotor core to both ends of the rotor core. This increases the contact area between the cooling lubricating oil and the rotor core, and facilitates the cooling and lubrication of the stator assembly.

[0022] In some exemplary embodiments, the rotor assembly further includes two pressure plates; at least a portion of the rotor core is pressed between the two pressure plates, and the pressure plates abut against and are fixedly connected to the stepped structure of the rotor shaft;

[0023] The pressure plate has one or more flow guide holes, which are connected to the first flow guide groove.

[0024] By setting a pressure plate and providing guide holes on the pressure plate, the cooling lubricating oil, after passing through the first guide groove, flows along a designed path, effectively reducing energy loss during the flow process. After flowing through the guide holes, the cooling lubricating oil splashes out from both ends of the rotor assembly, thus achieving cooling and lubrication of the stator windings of the stator assembly.

[0025] An electric motor includes a stator assembly and a rotor assembly; the rotor assembly is the rotor assembly described in any of the above embodiments, the stator assembly is located on the outer periphery of the rotor core, and the rotor assembly further includes two pressure plates; the two pressure plates are respectively disposed at both ends of the oil passage groove; each pressure plate is provided with one or more guide holes, and the guide holes communicate with a first guide groove.

[0026] The guide hole is configured to guide the cooling lubricating oil passing through the rotor assembly to the space where the stator winding of the stator assembly is located; the guide hole is configured as an arc-shaped hole along the circumferential direction of the rotor axis.

[0027] The guide hole is set as an arc-shaped hole extending along the circumference of the rotor shaft, which is adapted to the circumferential motion of the rotor assembly. This allows the cooling and lubricating oil to splash out through the arc-shaped guide hole with a large flow channel under the action of circumferential inertial force, so as to achieve effective cooling and lubrication of the stator winding of the stator assembly over a large area.

[0028] A vehicle comprising the motor described in the above embodiments.

[0029] After reading and understanding the accompanying diagrams and detailed descriptions, other aspects can be understood. Attached Figure Description

[0030] The accompanying drawings are provided to further understand the technical solutions in this paper and form part of the specification. They are used together with the embodiments of this application to explain the technical solutions in this paper and do not constitute a limitation on the technical solutions in this paper.

[0031] Figure 1 This is an exploded view of a partial structure of a motor according to an embodiment of this application;

[0032] Figure 2 This is a schematic cross-sectional view of a rotor shaft according to an embodiment of this application. Figure 1 ;

[0033] Figure 3 This is a schematic cross-sectional view of a rotor shaft according to an embodiment of this application. Figure 2 ;

[0034] Figure 4 This is a schematic cross-sectional view of a partial structure of a motor according to an embodiment of this application.

[0035] Figure label:

[0036] 1-Rotor shaft, 11-Shaft body, 11a-Oil inlet section, 11b-Matching section, 11c-Oil outlet section, 11d-Stepped structure, 12-Oil passage groove, 13-Helical groove, 14-Second guide groove;

[0037] 2-Rotor core, 21-First guide groove;

[0038] 3-Stator assembly, 31-Stator winding, 32-Stator core;

[0039] 4-Pressure plate, 41-Guide hole. Detailed Implementation

[0040] The technical solutions described herein will be further illustrated below with reference to the accompanying drawings and specific embodiments. It is understood that the specific embodiments described herein are merely for illustrative purposes and not for limiting the scope of this document.

[0041] In one embodiment of this application, as Figures 1 to 4 As shown, a rotor assembly is provided. The rotor assembly includes a rotor core 2 and a rotor shaft 1, with the rotor core 2 fitted around the outer circumference of the rotor shaft 1. The rotor shaft 1 includes a shaft body 11 and an oil inlet groove 12 disposed on the shaft body 11. An oil inlet channel is provided on a section of the shaft body 11, and the shaft body 11 can be constructed entirely as a hollow shaft. Alternatively, the shaft body 11 can be partially hollowed out within a portion of a solid shaft section, with the channel within this hollow section serving as the oil inlet channel.

[0042] An oil passage groove 12 is disposed on the side wall of the shaft 11 and penetrates the side wall of the shaft 11. The oil passage groove 12 can be centrally disposed on the shaft 11 along the axial direction. The cross-sectional shape of the oil passage groove 12 along the axial direction can be rectangular, elongated, or oblong. The oil passage groove 12 is connected to an oil inlet channel disposed inside the shaft 11. The end of the oil passage groove 12 near the rotor core 2 is used as an oil outlet.

[0043] like Figure 1 As shown, the shaft 11 can be configured to include an oil inlet section 11a and a mating section 11b arranged sequentially, with the diameters of the two sections being different. An oil passage groove 12 can be disposed on the mating section 11b, which mates with the rotor core 2. The axial dimension of the oil passage groove 12 can be designed to be slightly smaller than the axial dimension of the rotor core 2 to prevent the cooling lubricating oil from splashing indiscriminately and affecting the cleanliness of the rotor assembly. An oil inlet channel is disposed on the oil inlet section 11a. An oil inlet cavity is provided inside the mating section 11b, one end of which is connected to one end of the oil inlet channel. Figure 4 As shown, the cooling lubricating oil enters from the other end of the oil inlet channel (the left end shown in the figure), flows through the oil inlet cavity, and then flows out from the oil groove 12, so as to guide the cooling lubricating oil to part or all of the inner surface of the rotor core 2, so as to achieve cooling and lubrication of the rotor core 2.

[0044] The design of the entire rotor shaft 1 allows for the installation of various types of oil outlets. The oil groove 12 can be used as an oil outlet, and the end extending axially along the rotor shaft 1, opposite to the oil inlet channel, can also be used as an oil outlet. The overall layout of the oil outlets is related to the specific structure of the motor, increasing adaptability. By providing the oil groove 12 on the rotor shaft 1, which is arranged opposite to the rotor core 2, some or all of the cooling and lubricating oil can be directly guided to the rotor core 2, optimizing the overall flow path of the cooling and lubricating oil and effectively improving the cooling and lubrication efficiency of the rotor assembly.

[0045] In some exemplary embodiments, such as Figure 1 As shown, multiple oil passage grooves 12 can be arranged circumferentially along the mating section 11b. The multiple oil passage grooves 12 can be evenly spaced and extend axially along the shaft 11. Alternatively, the oil passage grooves 12 can penetrate the mating section 11b radially, that is, penetrate from one side wall of the mating section 11b along the diameter direction to the opposite side wall. The figure illustrates the technical solution in detail using four equally spaced rectangular oil passage grooves 12 as an example. The multiple oil passage grooves 12 give the shaft 11 a partially hollowed-out design structure. This hollowed-out structure reduces the overall weight of the rotor shaft 1 and increases the flow rate of cooling and lubricating oil per unit time, effectively improving the cooling and lubrication efficiency of the motor, thus achieving high efficiency.

[0046] In some exemplary embodiments, such as Figure 1 As shown, the diameter of the mating section 11b is larger than the diameter of the oil inlet section 11a. Therefore, the shaft 11 can be designed as a stepped shaft, forming a stepped structure 11d between the oil inlet section 11a and the mating section 11b. The wall thickness H of the stepped structure 11d is greater than the wall thickness h of the oil inlet section 11a. Figure 2 As shown, on one side of the shaft 11 (upper or lower along the central axis), the thickness of the stepped structure 11d in the vertical direction is greater than the wall thickness of the oil inlet section 11a to ensure the strength of the mating shaft section between the rotor shaft 1 and the rotor core 2. The oil inlet section 11a and the mating section 11b can be designed as hollow shaft sections with equal wall thickness. By segmenting the rotor shaft 1 and optimizing the overall structure, the weight of the rotor shaft 1 can be reduced while still meeting the diameter requirements of the motor for the mating area between the rotor shaft 1 and the rotor core 2 to meet transmission performance requirements. Designing the shaft 11 as a stepped shaft can also reduce the complexity of machining, thereby reducing the manufacturing cost of the rotor assembly.

[0047] In some exemplary embodiments, such as Figure 1As shown, the shaft 11 can also be configured to include an oil outlet section 11c. The oil inlet section 11a, the mating section 11b, and the oil outlet section 11c can be sequentially connected. An oil outlet channel is provided within the oil outlet section 11c, and the oil outlet channel and the oil inlet channel can be arranged on the same central axis. The oil outlet channel is connected to the oil inlet channel through the oil inlet cavity to form another cooling and lubricating oil passage. An oil outlet can be provided at the end of the oil outlet section 11c that is not connected to the mating section 11b. Alternatively, the oil outlet section 11c can be designed as a closed structure to increase the product diversity of the rotor shaft 1. The oil inlet section 11a, the mating section 11b, and the oil outlet section 11c can be configured as a one-piece structure with collinear central axes. This design eliminates the need for segmented molding and reassembly, reducing the overall manufacturing complexity of the rotor shaft 1 and effectively improving the manufacturing precision of the rotor shaft 1.

[0048] In some exemplary embodiments, such as Figure 2 , Figure 3 As shown, a spiral groove 13 is provided on the inner wall of the oil inlet channel of the rotor shaft 1. The spiral groove 13 can be provided only on the inner wall of the oil inlet section 11a, or it can be provided on the inner wall of the oil outlet section 11c. The cross-sectional shape of the spiral groove 13 can be semi-circular, triangular, or rectangular, etc. Two or three spiral grooves 13 can also be provided on the inner wall of the rotor shaft 1. The rotation direction of the spiral groove 13 is set to be the same as the rotation direction of the rotor shaft 1 to guide the cooling lubricating oil and facilitate its forward flow. The spiral groove 13 can also reduce the velocity loss of the cooling lubricating oil during flow to a certain extent, thereby reducing cooling lubrication costs.

[0049] In some exemplary embodiments, such as Figure 1 As shown, one or more first flow guiding grooves 21 are provided on the inner wall of the rotor core 2. The first flow guiding grooves 21 are designed to extend through the rotor core 2 along its thickness direction (axial direction), with their openings facing the inner cavity of the rotor core 2. The rotor core 2 and rotor shaft 1 form multiple flow channels along the axial direction of the rotor core 2 at the first flow guiding grooves 21. These multiple flow channels are connected to the oil inlet cavity. The cross-sectional shape of the first flow guiding groove 21 can be semi-circular, arc-shaped, etc. The multiple first flow guiding grooves 21 are evenly arranged along the circumference of the rotor core 2, or not evenly spaced. Figure 4 As shown by the dashed arrow, the cooling lubricating oil flows out from the oil groove 12 of the rotor shaft 1, and a portion enters the gap between the rotor shaft 1 and the rotor core 2. It then flows through the first guide groove 21 on the inner wall of the rotor core 2 to both ends of the rotor core 2. This flow path of the cooling lubricating oil increases the contact area between the oil and the rotor core 2, and also facilitates subsequent cooling and lubrication of the stator assembly 3.

[0050] In some exemplary embodiments, such as Figure 1 As shown, a second flow-guiding groove 14 can be provided on the outer wall of the mating section 11b, and the second flow-guiding groove 14 extends axially along the mating section 11b. The cross-sectional shape of the second flow-guiding groove 14 can be set to be the same as the cross-sectional shape of the first flow-guiding groove 21. Multiple second flow-guiding grooves 14 can be equally spaced along the circumference of the mating section 11b. Multiple first flow-guiding grooves 21 and multiple second flow-guiding grooves 14 can be arranged sequentially with intervals between them.

[0051] In some exemplary embodiments, such as Figure 1 , Figure 4 As shown, the rotor assembly also includes two pressure plates 4. The two pressure plates 4 are located at the left and right ends of the mating section 11b, respectively. Part or all of the rotor core 2 is pressed between the two pressure plates 4. The pressure plates 4 can contact and be fixed to the stepped structure of the rotor shaft 1, for example, by bolts. After the motor is assembled, the stator winding 31 in the stator assembly 3 is fixed to the stator core 32 by winding. Both ends of the stator winding 31 extend a certain length beyond the stator core 32.

[0052] One or more flow guide holes 41 are provided on the pressure plate 4. All or part of the flow area of ​​the flow guide hole 41 is in communication with the first flow guide groove 21, or with the second flow guide groove 14, etc. In actual working conditions, such as... Figure 4 As shown, cooling lubricating oil is introduced from the oil sump into the oil inlet channel located on the rotor shaft 1 by an electronic oil pump or other device through oil pipes or oil passages. The spiral groove 13 set on the inner wall of the oil inlet channel and the rotor shaft 1 generate centripetal force during rotation, which is decomposed into axial force along the axis of the rotor shaft 1. This axial force pushes the cooling lubricating oil forward, further increasing the flow rate of the cooling lubricating oil and improving the lubrication effect. A portion of the cooling lubricating oil flows through the oil groove 12 to the rotor core 2, and then flows through the first guide groove 21 and the guide hole 41, causing the cooling lubricating oil to splash out from both ends of the rotor assembly, thereby achieving cooling and lubrication of the stator winding 31.

[0053] In some exemplary embodiments, such as Figure 1As shown, the two pressure plates 4 can be made identical to reduce the number of parts and lower the management cost of components. During actual assembly into a motor, the pressure plates 4 can be rotated at different angles to be mounted onto the rotor shaft 1. The guide holes 41 on the left pressure plate 4 can be configured to communicate with a portion of the first guide grooves 21 on the rotor core 2. The guide holes 41 on the right pressure plate 4 can be configured to communicate with the remaining first guide grooves 21 on the rotor core 2. The number of first guide grooves 21 communicating with the guide holes 41 on the left is the same as the number communicating with the guide holes 41 on the right, to increase the uniformity of flow to both ends of the stator winding 31 and improve the reliability of the motor.

[0054] In some exemplary embodiments, such as Figure 1 As shown, the guide hole 41 can be configured as an arc-shaped hole extending circumferentially along the rotor shaft 1. The arc-shaped hole is adapted to the circular motion of the rotor assembly. The center of the arc-shaped hole can be collinear with the central axis of the rotor shaft 1, allowing the cooling lubricating oil to splash out through the arc-shaped guide hole 41 with a larger flow channel under the action of circumferential inertial force. This is used to guide the cooling lubricating oil passing through the rotor assembly to the space where the stator winding 31 of the stator assembly 3 is located, such as... Figure 4 As shown.

[0055] In another embodiment of this application, such as Figure 1 , Figure 4 As shown, an electric motor is also provided. This electric motor includes a stator assembly 3 and a rotor assembly. The rotor assembly is configured as the rotor assembly described in any of the above embodiments, and therefore possesses all the beneficial effects of the aforementioned rotor assembly, which will not be elaborated further here.

[0056] In another embodiment of this application, a vehicle is also provided. This vehicle includes the motor described in the above embodiments. Therefore, this vehicle possesses all the beneficial effects of the aforementioned motor, which will not be repeated here.

[0057] In the description herein, the terms “upper,” “lower,” “one side,” “the other side,” “one end,” “the other end,” “side,” “opposite,” “four corners,” “periphery,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the structure referred to has a specific orientation, or is constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this document.

[0058] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the terms "connection," "direct connection," "indirect connection," "fixed connection," "installation," and "assembly" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. The terms "installation," "connection," and "fixed connection" can refer to a direct connection or an indirect connection through an intermediate medium, or they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this document based on the specific circumstances.

[0059] While the embodiments disclosed herein are as described above, the content is merely for the purpose of understanding this document and is not intended to limit it. Any person skilled in the art may make any modifications and changes to the form and details of the implementation without departing from the spirit and scope disclosed herein; however, the scope of patent protection herein shall still be defined by the appended claims.

Claims

1. A rotor assembly, comprising a rotor core and a rotor shaft, wherein the rotor core is sleeved on the outer periphery of the rotor shaft, and is characterized in that, The rotor shaft includes: a shaft body and an oil passage groove; the shaft body includes an oil inlet section and a mating section, the diameter of the mating section is greater than that of the oil inlet section, the oil inlet section and the mating section form a stepped structure, the wall thickness of the stepped structure is greater than that of the oil inlet section, the oil inlet section is provided with an oil inlet channel extending axially, the rotor core is sleeved on the outer peripheral side of the mating section, the mating section has an oil inlet inner cavity, the oil inlet channel is communicated with the oil inlet inner cavity, the oil passage groove is arranged on the side wall of the mating section, the oil passage groove is communicated with the oil inlet inner cavity, the oil passage groove penetrates through the side wall of the mating section, and at least part of the inner surface of the rotor core is exposed to the oil passage groove, so that the cooling lubricating oil passing through the rotor shaft can be guided to the inner surface of the rotor core through the oil passage groove; A plurality of the oil passage grooves are uniformly arranged at equal intervals along the circumferential direction of the shaft body, the oil passage groove penetrates through the mating section along the radial direction of the mating section, and the oil passage groove extends along the axial direction of the shaft body; the shaft body is a hollow shaft, and the oil passage groove is a hollowed-out structure formed on the shaft body.

2. The rotor assembly according to claim 1, wherein The shaft body is an integral structure.

3. The rotor assembly according to claim 1 or 2, characterized in that, The inner wall of the oil inlet channel is provided with a spiral groove, and the rotation direction of the spiral groove is the same as the rotation direction of the rotor shaft.

4. The rotor assembly according to claim 3, wherein The rotor shaft further includes an oil outlet section, the oil outlet section has an oil outlet channel, the oil outlet channel is coaxially arranged with the oil inlet channel, and the oil outlet channel is communicated with the oil inlet channel through the oil inlet inner cavity.

5. The rotor assembly according to claim 3, wherein, One or more first diversion grooves extending along the axial direction of the rotor core are arranged on the inner wall of the rotor core, the first diversion grooves penetrate through both end faces of the rotor core, and the openings thereof face the inner cavity of the rotor core. An oil flow channel is formed between the rotor core and the rotor shaft at the first diversion grooves, and the oil flow channel is communicated with the oil inlet inner cavity.

6. The rotor assembly according to claim 5, wherein It further includes two pressing plates; at least part of the rotor core is pressed between the two pressing plates, and the pressing plates are abutted against the stepped structure of the rotor shaft and fixedly connected; One or more diversion holes are arranged on the pressing plate, and the diversion holes are communicated with the first diversion grooves.

7. A motor, comprising a stator assembly and a rotor assembly; characterized in that, The rotor assembly is the rotor assembly according to any one of claims 1-5 above. The stator assembly is located on the outer periphery of the rotor core. The rotor assembly further includes two pressing plates; the two pressing plates are respectively arranged at both ends of the oil passage groove; one or more diversion holes are arranged on the pressing plate, and the diversion holes are communicated with the first diversion grooves; Wherein, the diversion holes are arranged to guide the cooling lubricating oil passing through the rotor assembly to the space where the stator windings of the stator assembly are located; the diversion holes are arranged as arc-shaped holes along the circumferential direction of the rotor shaft.

8. A vehicle, characterized in that, It includes the motor according to claim 7 above.

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