Rotor end plate, rotor assembly, motor, and vehicle

Abstract

The present invention provides a rotor end plate, a rotor assembly, a motor, and a vehicle. The rotor end plate comprises a plate body; one end of the plate body in the axial direction forms a first plate surface, and the other end thereof in the axial direction forms a second plate surface; the first plate surface is arranged to face a rotor core, and an oil channel is recessed on the first plate surface; oil inlets are formed in one end of the oil channel and used for receiving cooling oil from a rotating shaft; oil outlet holes are formed in the end of the oil channel distant from the oil inlets; one end of each oil outlet hole is communicated with the oil channel, and the other end of the oil outlet hole extends through to the second plate surface, so as to form an oil outlet communicated with the oil outlet hole on the second plate surface; each oil outlet hole is arranged obliquely with respect to the axial direction of the plate body, and is inclined radially outward from the oil channel to the corresponding oil outlet. The oil channel is formed on the first plate body, allowing the cooling oil to come into direct contact with the rotor core and magnetic steel; moreover, the cooling oil can be directly thrown out through the obliquely arranged oil outlet holes, taking away the heat on the stator winding in time, further improving the cooling effect for the motor.

Description

Rotor end plate, rotor assembly, motor and vehicle

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on February 23, 2024, with application number 202410204866.8, and invention name “Rotor end plate, rotor assembly, motor and vehicle”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The invention relates to the field of vehicle technology, and mainly relates to a rotor end plate, a rotor assembly, a motor and a vehicle. Background Art

[0003] With the continuous development of new energy vehicle technology, electric motors, as core components of new energy vehicles, are increasingly developing towards high torque density and high power density, which will place higher demands on the cooling and heat dissipation capabilities of the motors. Currently, the market uses oil cooling to dissipate heat. By providing a rotor oil tank that runs axially through the rotor core, cooling oil is transported to the rotor oil tank via the rotating shaft, thereby cooling the rotor core and rotor magnets. However, this method will have a negative impact on the dynamic balance of the motor and NVH (Noise, Vibration, Harshness) performance.

[0004] Summary of the Invention

[0005] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a rotor end plate, a rotor assembly, a motor and a vehicle, which cool the rotor core and the stator assembly by adopting the method of oil throwing of the rotor end plate, thereby avoiding the dynamic balance problem of the motor caused by opening an oil channel in the rotor core, and improving the cooling performance of the motor.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] The technical solution of one aspect of the present invention proposes a rotor end plate, comprising: a plate body, wherein a first plate surface is formed at one end of the plate body along the axial direction, and a second plate surface is formed at the other end along the axial direction, the first plate surface is used to be set toward the rotor core, an oil channel is recessed on the first plate surface, an oil inlet is provided at one end of the oil channel, and the oil inlet is used to receive cooling oil from the rotating shaft, an oil outlet is provided at one end of the oil channel away from the oil inlet, one end of the oil outlet is connected with the oil channel, and the other end of the oil outlet extends through the second plate surface to form an oil outlet connected with the oil outlet hole on the second plate surface, the oil outlet hole is inclined relative to the axial direction of the plate body, and the oil outlet hole is inclined radially outward from the oil channel to the oil outlet.

[0008] The rotor end plate disclosed in this application has an oil channel recessed on the first plate surface, allowing cooling oil to directly contact the rotor core and the magnets embedded therein, thereby effectively cooling the rotor core and the magnets. Furthermore, an oil outlet is provided at one end of the oil channel, distal from the oil inlet, with the other end extending through the second plate surface to form an oil outlet. As the rotor end plate rotates with the shaft, cooling oil can be directly ejected from the second plate surface through the oil outlet and the outlet. The tilt angle increases the flow dynamics of the cooling oil. When the rotor rotates at high speed, the cooling oil is more likely to flow radially outward under the action of centrifugal force, thereby more effectively ejecting the cooling oil. The ejected cooling oil, under the action of centrifugal force and pressure, splashes onto the ends of the stator windings located outside the rotor. The cooling oil removes heat from the stator windings, reducing the winding temperature and thereby extending the service life of the motor. Furthermore, the tilted design of the oil outlet increases the efficiency and range of oil ejection, further enhancing the cooling effect.

[0009] According to some technical solutions of the present invention, the oil passage includes a first guide groove, which includes a converging channel and at least two branch channels. The liquid inlet end of the converging channel is connected to the oil inlet, one end of each branch channel intersects and connects to the liquid outlet end of the converging channel, and the other ends of each branch channel are separated and each is provided with the oil outlet hole. The diversion design of the converging channel and the branch channels on the first guide groove can more evenly distribute the cooling oil to the various oil outlet holes, ensuring that each oil outlet hole has sufficient oil for oil removal, and also enhancing the efficiency of oil removal, which can more effectively remove heat from the motor windings.

[0010] According to some technical solutions of the present invention, a buffer wall is provided between two adjacent branch channels, and the buffer wall includes a flat wall and an arc-shaped wall. The flat wall is arranged opposite to the liquid outlet of the confluence channel, and the two sides of the flat wall are connected to the arc-shaped wall, respectively. The arc-shaped wall is used to guide the cooling oil in the confluence channel into the branch channel. The flat wall provides a smooth transition interface for the oil flow, which reduces the resistance encountered by the oil flow when passing through this area, thereby reducing the back pressure on one side of the confluence channel. The arc-shaped wall can effectively guide the cooling oil to flow smoothly from the confluence channel into each branch channel, avoiding sudden changes in direction or speed during the flow process, which may cause instability in the oil circuit.

[0011] Some technical solutions of the present invention further include a convex curved surface connected between the liquid outlet of the converging channel and the branch channel. Because the convex curved surface has a continuous curved surface structure, it reduces friction and resistance during the flow of the cooling oil, reduces turbulence, and ensures smoother flow of the cooling oil.

[0012] According to some technical solutions of the present invention, the branch channels of the same first guide groove are arranged symmetrically. The symmetrical arrangement of the branch channels reduces stress concentration caused by asymmetry, helps maintain the balance and stability of the rotor end plate, and reduces vibration or deviation caused by asymmetry.

[0013] According to some technical solutions of the present invention, the oil channel includes a plurality of the first guide grooves, and the plurality of the first guide grooves are arranged at intervals along the circumference of the plate body.

[0014] According to some technical solutions of the present invention, the oil channel further includes a second guide groove, which connects the converging channels of two circumferentially adjacent first guide grooves.

[0015] According to some technical solutions of the present invention, the plate body is in a ring shape, the oil inlet is arranged near the center end of the plate body, and at least one positioning block protruding relative to the annular inner wall is provided on the annular inner wall of the plate body. The positioning block is used to be embedded in the groove of the rotating shaft to fix the radial connection between the plate body and the rotating shaft.

[0016] The technical solutions of the second aspect of the present invention provide a rotor assembly comprising a rotor, the rotor comprising a rotating shaft, a rotor core, and a magnet, the rotor core being nested in the rotating shaft, the magnet being embedded in the rotor core, the rotating shaft being provided with an oil channel for conveying cooling oil; and a rotor end plate as described in any of the above embodiments, wherein the rotor end plates comprise two rotor end plates, the first plate surface of each rotor end plate being disposed toward the rotor core, the rotor end plates being disposed at each axial end of the rotor core, the oil channel being connected to the oil inlet for conveying cooling oil. By disposing the rotor end plates of any of the above embodiments at both axial ends of the rotor core, under high-speed rotation of the rotating shaft, cooling oil in the oil channel is directly contacted with the ends of the rotor core through the rotor end plates at both ends, thereby effectively removing heat from the ends of the rotor core. Furthermore, the rotor end plates are provided with oil channels and oil outlet holes arranged obliquely relative to the rotating shaft and extending away from the center of the rotating shaft, enabling the cooling oil to splash and cool the stator assembly, thereby improving the cooling performance of the motor.

[0017] According to some technical solutions of the present invention, the rotating shaft is formed along the axis to form the oil delivery channel, and also includes an oil guide hole, which radially penetrates along the wall thickness direction of the rotating shaft, and the oil guide hole connects the oil delivery channel and the oil inlet.

[0018] The technical solutions of the three aspects of the present invention propose a motor, including a motor housing; a rotor assembly as described in any of the above embodiments, the rotor assembly is installed in the motor housing; and a stator assembly, the stator assembly is arranged on the outside of the rotor assembly.

[0019] The technical solutions of the four aspects of the present invention provide a vehicle comprising a vehicle body and a drive system arranged on the vehicle body, wherein the drive system includes the above-mentioned motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] FIG1 is a front view of a rotor end plate according to an embodiment of the present application;

[0021] FIG2 is a rear view of a rotor end plate according to an embodiment of the present application;

[0022] FIG3 is a perspective view of a rotor end plate according to an embodiment of the present application;

[0023] FIG4 is a cross-sectional view of a rotor end plate according to an embodiment of the present application;

[0024] FIG5 is a partial enlarged view of point A in FIG4 ;

[0025] FIG6 is an axial cross-sectional view of a rotor assembly according to an embodiment of the present application;

[0026] FIG7 is a radial cross-sectional view of a rotor assembly according to an embodiment of the present application;

[0027] FIG8 is a partial enlarged view of point B in FIG7 .

[0028] The corresponding relationship between the reference numerals and component names is as follows:

[0029] 1 plate body, 101 first plate surface, 102 second plate surface, 103 oil inlet, 104 oil outlet, 105 oil outlet, 106 first guide groove, 1061 converging channel, 1062 branch channel, 107 second guide groove;

[0030] 2 buffer wall, 21 plane wall, 22 curved wall;

[0031] 3 convex arc surface;

[0032] 4 positioning blocks;

[0033] 100 rotor end plate;

[0034] 200 rotor, 201 oil delivery channel, 202 oil guide hole, 210 rotating shaft, 220 rotor core, 230 magnetic steel. DETAILED DESCRIPTION

[0035] The present invention provides a rotor end plate 100, a rotor 200 assembly, a motor, and a vehicle. To clarify the objectives, technical solutions, and advantages of the present invention, the present invention is further described below with reference to the accompanying drawings and examples. It should be understood that the specific examples described herein are intended only to illustrate the present invention and are not intended to limit its scope.

[0036] In the description of the present invention, it should be understood that the terms "upper", "lower", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0037] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections, or mutual communication; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0038] Please refer to Figures 1 to 5. An embodiment of one aspect of the present application provides a rotor end plate 100, including a plate body 1, wherein a first plate surface 101 is formed at one end of the plate body 1 along the axial direction, and a second plate surface 102 is formed at the other end along the axial direction. The first plate surface 101 is used to be set toward the core of the rotor 200, and an oil channel is recessed on the first plate surface 101. An oil inlet 103 is provided at one end of the oil channel. The oil inlet 103 is used to receive cooling oil from the rotating shaft 210, and an oil outlet hole 104 is provided at one end of the oil channel away from the oil inlet 103. One end of the oil outlet hole 104 is connected to the oil channel, and the other end of the oil outlet hole 104 passes through the second plate surface 102, so that an oil outlet 105 connected to the oil outlet hole 104 is formed on the second plate surface 102, and the oil outlet hole 104 is inclined relative to the axial direction of the plate body 1, and the oil outlet hole 104 is inclined radially outward from the oil channel to the oil outlet 105.

[0039] Specifically, as shown in FIG3 , an oil channel is recessed on the first plate surface 101, which is disposed toward the core of the rotor 200. An oil inlet 103 is provided at one end of the oil channel for receiving cooling oil from the rotating shaft 210. Thus, during operation of the motor, the cooling oil channel within the rotating shaft 210 moves along with the rotating shaft 210 and enters the oil channel of the plate body 1 through the oil inlet 103, allowing the cooling oil to directly contact the rotor core 220 and the magnets 230 embedded therein, thereby achieving a good cooling effect on the rotor core 220 and the magnets 230. Then, an oil outlet hole 104 is provided at one end of the oil passage away from the oil inlet 103, and the other end of the oil outlet hole 104 penetrates into the second plate surface 102 to form an oil outlet 105. When the rotor end plate 100 rotates along with the rotating shaft 210, the cooling oil can be directly thrown out from the second plate surface 102 through the oil outlet hole 104 and the oil outlet 105.

[0040] Furthermore, as shown in Figures 4 and 5, since the oil outlet hole 104 is tilted relative to the axial direction of the plate body 1 and tilted radially outward from the oil channel to the oil outlet 105, a certain inclination angle is generated between the oil outlet hole 104 and the axial direction of the plate body 1. This inclination angle increases the flow dynamics of the cooling oil. When the rotor 200 rotates at high speed, the cooling oil is more likely to flow radially outward under the action of centrifugal force, thereby more effectively throwing out the cooling oil. The thrown cooling oil splashes onto the end of the stator winding located outside the rotor 200 under the action of centrifugal force and pressure. The cooling oil will take away the heat from the stator winding, reduce the temperature of the winding, and thus extend the service life of the motor. At the same time, the tilted design of the oil outlet hole 104 can increase the efficiency and range of oil throwing, further improving the cooling effect.

[0041] The rotor end plate 100 disclosed in this application, by providing oil channels on the plate body 1 and an oil outlet hole 104 inclined relative to the axial direction, can directly contact the rotor core 220 and the magnet 230, thereby directly removing heat from the rotor core 220 and the magnet 230. Then, under the influence of the centrifugal force and pressure of the rotor end plate 100, the cooling oil is directly splashed onto the stator winding side through the oil outlet hole 104 that penetrates the second plate surface 102. More specifically, the splashing method directly hits the motor winding end, allowing the cooling oil to more evenly cover the winding end, increasing the contact area between the cooling oil and the winding, and thus improving the cooling effect. The technical solution of the present application can not only greatly alleviate the risk of demagnetization of the magnet 230 and improve the problem of poor cooling of the motor end winding, but also avoid the need for a rotor 200 oil tank that runs axially through the rotor core 220 in the rotor core 220, and transport the cooling oil to the rotor 200 oil tank through the rotating shaft 210, thereby cooling the rotor core 220 and the rotor 200 magnet 230, which would bring negative impacts on the dynamic balance and NVH (Noise, Vibration, Harshness) of the motor.

[0042] It can be understood that the rotor end plate 100 is nested on the motor shaft 210, and the two ends of the plate body 1 along the axial direction respectively form a first plate surface 101 and a second plate surface 102. In actual application, the axial direction of the plate body 1 is consistent with the axial direction of the motor shaft 210.

[0043] Specifically, the oil channel includes a first guide groove 106, the first guide groove 106 includes a converging channel 1061 and at least two branch channels 1062, the liquid inlet end of the converging channel 1061 is connected to the oil inlet 103, one end of each branch channel 1062 intersects and is connected to the liquid outlet end of the converging channel 1061, and the other ends of each branch channel 1062 are separated and each is provided with an oil outlet hole 104.

[0044] Referring to Figures 1, 3, and 7, the first guide groove 106 has a bifurcated structure, with the converging channel 1061 serving as the trunk of the branch structure, and the branch channels 1062 serving as branches connected to the trunk. Specifically, the first guide groove 106 includes a converging channel 1061 and at least two branch channels 1062. The liquid inlet end of the converging channel 1061 is connected to the oil inlet 103, which means that the cooling oil first enters the converging channel 1061 and then, at the liquid outlet end of the converging channel 1061, is diverted to each branch channel 1062. Each branch channel 1062 has an oil outlet hole 104 at the other end. The oil outlet hole 104 allows the cooling oil to be transferred from the first plate surface 101 to the second plate surface 102 and ejected through the oil outlet 105 that penetrates the second plate surface 102. Thus, the diversion design of the converging channel 1061 and the branching channels 1062 can more evenly distribute the cooling oil to each oil outlet 104, ensuring that each oil outlet 104 has sufficient oil for oil shunting. Moreover, in actual design, the number of branching channels 1062 can be adjusted according to demand, and each branching channel 1062 is provided with an oil outlet 104 at the other end. This not only increases the flow rate of the cooling oil, but also enhances the efficiency of oil shunting, more effectively removing heat from the motor windings, thereby extending the service life of the motor.

[0045] More specifically, as shown in Figures 3 and 4 , a buffer wall 2 is provided between two adjacent branch channels 1062. The buffer wall 2 comprises a planar wall surface 21 and a curved wall surface 22. The planar wall surface 21 is positioned opposite the liquid outlet of the converging channel 1061. The curved walls 22 are connected on either side of the planar wall surface 21. These curved walls 22 are used to guide the cooling oil from the converging channel 1061 into the branch channels 1062. Thus, when the cooling oil flows out of the converging channel 1061, it first encounters the planar wall surface 21, providing a clear flow direction for the cooling oil. Subsequently, the planar wall surface 21 is connected on either side of the curved wall surface 22, thereby guiding the cooling oil from the converging channel 1061 to flow more smoothly into the various branch channels 1062.

[0046] Specifically, when the cooling oil enters the confluence channel 1061 from the oil inlet 103, a certain pressure will be formed in the confluence channel 1061 due to the increase in flow rate and change in direction, and the setting of the planar section wall surface 21 of the buffer wall 2 provides a smooth transition interface for the oil flow, so that the resistance encountered by the oil flow when passing through this area is reduced, thereby reducing the back pressure on one side of the confluence channel 1061. This is more conducive to improving the flow performance of the first guide groove 106, improving the cooling efficiency, and reducing problems such as component wear and thermal expansion caused by high back pressure. Then, the curved wall surface 22 can effectively guide the cooling oil to flow smoothly from the confluence channel 1061 into each branch channel 1062, avoiding sudden turns or speed changes during the flow process that cause the oil circuit to be unstable. The bifurcated structure of the first guide groove 106 provided in this application ensures that the flow stability of the cooling oil is maintained.

[0047] Furthermore, it also includes a convex curved surface 3, which is connected between the liquid outlet end of the converging channel 1061 and the branch channel 1062. Referring to Figures 1, 3, and 4, the branch channel 1062 includes two side walls, one side wall of the branch channel 1062 is connected to the buffer wall 2, and the other side wall of the branch channel 1062 is connected to the converging channel 1061. The convex curved surface 3 is connected between the other side wall of the branch channel 1062 and the converging channel 1061. In this way, when the cooling oil flows from the converging channel 1061 to the branch channel 1062, it will flow through the convex curved surface 3. Since the convex curved surface 3 has a continuous curved surface structure, it reduces the friction and resistance of the cooling oil during the flow process, reduces the formation of turbulence, and makes the flow of the cooling oil smoother.

[0048] In certain embodiments, as shown in FIG1 , the branch channels 1062 of the same first guide groove 106 are arranged symmetrically. By symmetrically arranging the branch channels 1062 on the plate body 1, when the shaft 210 rotates to drive the rotor end plate 100 to deliver cooling oil, the cooling oil can be more evenly distributed on the plate body 1 as it passes through the bifurcated structure. This reduces stress concentration caused by asymmetry, helps maintain the balance and stability of the rotor end plate 100, and reduces vibration or deviation caused by asymmetry.

[0049] In more detail, the first guide groove 106 is provided with a plurality of forked structures, and the plurality of forked structures are also distributed on the plate body 1 in a symmetrical distribution, so that it can still maintain efficient cooling function for the rotor core 220 of the motor and the windings distributed on the outside of the rotor core 220 when the rotor end plate 100 rotates at high speed or in a high temperature environment, thereby avoiding dynamic balance and NVH problems of the motor.

[0050] In certain embodiments, the oil passage includes a plurality of first guide grooves 106 , which are spaced apart along the circumference of the plate body 1 . Thus, the plurality of first guide grooves 106 are correspondingly connected to the converging channels 1061 , which is equivalent to providing a plurality of converging channels 1061 and branching channels 1062 . Furthermore, the spaced apart arrangement of the first guide grooves 106 along the circumference of the plate body 1 increases the contact area between the cooling oil and the rotor core 220 , thereby improving the cooling effect on the motor.

[0051] Furthermore, the oil passage includes a second guide groove 107, which connects the converging channels 1061 of two circumferentially adjacent first guide grooves 106. Thus, through the connecting effect of the second guide groove 107, the oil in the oil inlet 103 can flow more quickly and efficiently through the second guide groove 107 to the converging channel 1061 and the branch channel 1062 distributed away from the center of the plate body 1.

[0052] In more detail, as shown in Figures 1 and 3, the second guide grooves 107 are distributed in an annular shape on the plate body 1. The provision of the second guide grooves 107 can also help the cooling oil increase the coverage area of ​​the plate body 1, reduce the operating dysfunction of the motor caused by local overheating or insufficient cooling of the rotor core 220, and thereby improve the cooling effect of the rotor end plate 100 on the rotor core 220 and the magnet 230.

[0053] In certain embodiments, the plate body 1 is annular in shape, with the oil inlet 103 positioned near one end of the plate body 1. The annular inner wall of the plate body 1 is provided with at least one positioning block 4 that protrudes relative to the annular inner wall. The positioning block 4 is designed to fit within a groove in the rotating shaft 210 to secure the radial connection between the plate body 1 and the rotating shaft 210. As shown in FIG1 , the annular design of the plate body 1 allows the plate body 1 to be nested within the rotating shaft 210 via a centrally located through-hole. Furthermore, the positioning of the oil inlet 103 near one end of the plate body 1 allows cooling oil to flow more evenly throughout the oil passages of the plate body 1, improving cooling efficiency. Furthermore, to prevent relative motion between the plate body 1 and the rotating shaft 210 during high-speed rotation, which could cause dynamic balance issues in the motor, at least one positioning block 4 is provided on the annular inner wall that protrudes relative to the annular inner wall. This positioning block 4 can fit within the groove in the rotating shaft 210, providing a radial connection and ensuring a stable connection between the rotor end plate 100 and the rotating shaft 210, while reducing relative displacement caused by vibration or other external factors.

[0054] 6 to 8 , two embodiments of the present application provide a rotor 200 assembly, including a rotor 200 and a rotor end plate 100 as described in any of the above embodiments.

[0055] As shown in Figure 6, the rotor 200 includes a shaft 210, a rotor core 220, and magnets 230. The rotor core 220 is nested in the shaft 210, and the magnets 230 are embedded in the rotor core 220. The shaft 210 is provided with an oil channel 201 for conveying cooling oil. The rotor end plates 100 include two rotor end plates 100, with the first plate surface 101 of each end plate facing the rotor core 220. A rotor end plate 100 is provided at each axial end of the rotor core 220. The oil channel 201 communicates with the oil inlet 103 to convey cooling oil. By placing the rotor end plates 100 according to any of the above embodiments at the axial ends of the rotor core 220, the cooling oil in the oil channel 201 directly contacts the ends of the rotor core 220 through the rotor end plates 100 at both ends under the high-speed rotation of the shaft 210, thereby effectively removing heat from the ends of the rotor core 220. Moreover, the rotor end plate 100 is provided with an oil channel and an oil outlet hole 104 which is arranged obliquely relative to the rotating shaft 210 and extends away from the center of the rotating shaft 210. This allows the cooling oil to directly contact and dissipate heat with the windings arranged on the outside of the rotor 200 in a splashing manner through the rotor end plates 100 on both sides under the centrifugal force and pressure of the high-speed rotation of the rotor 200, thereby greatly improving the cooling performance of the rotor 200 assembly and the motor equipped with the covered rotor 200 assembly. It can also avoid dynamic balance and NVH problems caused by the opening of the oil channel inside the rotor 200, and enhance the structural stability of the rotor 200 assembly.

[0056] In more detail, an oil guide nozzle is provided at one axial end of the rotating shaft 210, which is used to connect with the cooling oil supply device. Furthermore, an oil pump can be used to transport the oil from the cooling oil supply device to the oil delivery channel 201 of the rotating shaft 210, so that a better oil throwing effect can still be achieved when the rotating shaft 210 rotates at a low speed.

[0057] In certain embodiments, the rotating shaft 210 is formed along its axis to form an oil delivery channel 201. The oil delivery channels 201 also include oil guide holes 202 that extend radially through the wall thickness of the rotating shaft 210, connecting the oil delivery channel 201 with the oil inlet 103. Forming the oil delivery channel 201 along the axis of the rotating shaft 210 allows cooling oil to flow along the axis of the rotating shaft 210. Specifically, referring to Figures 6 and 7, the oil guide holes 202 extend radially through the wall thickness of the rotating shaft 210 and are located at both ends of the rotating shaft 210. These holes are positioned opposite the oil inlet 103 on the rotor end plate 100 to connect the oil delivery channel 201 with the oil passage. Furthermore, the oil guide holes 202 are spaced apart circumferentially around the rotating shaft 210, allowing cooling oil in the oil delivery channel 201 to enter the oil passage more evenly.

[0058] The three aspects of the present application provide a motor, comprising a motor housing, a rotor 200 assembly as described in any of the above embodiments, the rotor 200 assembly being installed in the motor housing, and a stator assembly being arranged on the outside of the rotor 200 assembly. By adopting the above rotor 200 assembly, the stator assembly being arranged on the outside of the rotor 200 assembly, and the rotor end plate 100 being provided with an oil channel and an oil outlet 104 inclined relative to the rotating shaft 210, the cooling oil in the rotating shaft 210 can cool the stator assembly by throwing oil, and the cooling oil can also take away the heat of the rotor core 220 and the magnet 230 by direct contact with them, which can significantly improve the temperature of the rotor 200 magnet 230 and the core, greatly improving the cooling performance of the motor, greatly alleviating the risk of demagnetization of the magnet 230 and improving the problem of poor cooling of the motor end winding.

[0059] The four embodiments of the present application provide a vehicle comprising a vehicle body and a drive system provided on the vehicle body, wherein the drive system includes a motor as described above. The above-described motor is applied to the vehicle of the present application to achieve all the above-described beneficial effects, which will not be further elaborated here.

[0060] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of the present invention, and all such changes or substitutions should fall within the scope of protection of the present invention.

Claims

1. A rotor end plate, characterized in that: include: A plate body, wherein a first plate surface is formed at one end of the plate body along the axial direction, and a second plate surface is formed at the other end along the axial direction, the first plate surface is used to be set toward the rotor core, an oil channel is recessed on the first plate surface, an oil inlet is provided at one end of the oil channel, and the oil inlet is used to receive cooling oil from the rotating shaft, an oil outlet is provided at one end of the oil channel away from the oil inlet, one end of the oil outlet is communicated with the oil channel, and the other end of the oil outlet extends through the second plate surface to form an oil outlet communicated with the oil outlet hole, the oil outlet hole is inclined relative to the axial direction of the plate body, and the oil outlet hole is inclined radially outward from the oil channel to the oil outlet.

2. The rotor end plate according to claim 1, characterized in that: The oil channel includes a first guide groove, which includes a converging channel and at least two branch channels. The liquid inlet end of the converging channel is connected to the oil inlet, one end of each of the branch channels intersects and is connected to the liquid outlet end of the converging channel, and the other ends of each of the branch channels are separated and each is provided with the oil outlet hole.

3. The rotor end plate according to claim 2, characterized in that: A buffer wall is provided between two adjacent branch channels, and the buffer wall includes a planar section wall and a curved wall. The planar section wall is arranged opposite to the liquid outlet end of the converging channel, and the curved wall is connected to both sides of the planar section wall respectively. The curved wall is used to guide the cooling oil in the converging channel into the branch channel.

4. The rotor end plate according to claim 2, characterized in that: It also includes a convex arc surface, wherein the convex arc surface is connected between the liquid outlet end of the converging channel and the branch channel; and / or The branch channels of the same first guide groove are arranged symmetrically.

5. The rotor end plate according to claim 2, characterized in that: The oil passage includes a plurality of first guide grooves, and the plurality of first guide grooves are arranged at intervals along the circumference of the plate body; The oil passage further includes a second guide groove, which connects the converging channels of two circumferentially adjacent first guide grooves.

6. The rotor end plate according to any one of claims 1 to 5, characterized in that: The plate body is in a ring shape, and the oil inlet is arranged near the center end of the plate body. At least one positioning block protruding relative to the annular inner wall is provided on the annular inner wall of the plate body. The positioning block is used to be embedded in the groove of the rotating shaft to fix the radial connection between the plate body and the rotating shaft.

7. A rotor assembly, characterized in that: include: The rotor comprises a rotating shaft, a rotor core and magnetic steel, wherein the rotor core is nested on the rotating shaft, the magnetic steel is embedded in the rotor core, and the rotating shaft is provided with an oil delivery channel for delivering cooling oil; The rotor end plate according to any one of claims 1 to 6, wherein the rotor end plate comprises two plates, the first plate surface of the rotor end plate is arranged toward the rotor core, and the axial ends of the rotor core are respectively The rotor end plate is separately provided, and the oil delivery channel is connected to the oil inlet to transfer cooling oil.

8. The rotor assembly according to claim 7, wherein: The rotating shaft is penetrated along the axis to form the oil delivery channel, and further includes an oil guide hole, which radially penetrates along the wall thickness direction of the rotating shaft, and the oil guide hole connects the oil delivery channel and the oil inlet.

9. A motor, characterized in that: include Motor housing; The rotor assembly according to claim 7 or 8, wherein the rotor assembly is installed in the motor housing; A stator assembly is arranged outside the rotor assembly.

10. A vehicle, characterized in that: It comprises a vehicle body and a driving system arranged on the vehicle body, wherein the driving system includes the motor as claimed in claim 9.

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