Rotor assembly of motor, motor and vehicle

Abstract

The utility model discloses a rotor assembly of a motor, a motor and a vehicle, and relates to the technical field of motors, and the rotor assembly comprises a plurality of cooling channels formed in a rotor core; the rotating shaft penetrates through the rotor iron core and is fixed with the rotor iron core; the two balance plates are fixedly arranged on the rotating shaft and are spaced in the axial direction of the rotating shaft, the rotor iron core is located between the two balance plates, each balance plate is provided with an oil inlet hole and an oil throwing hole, and the multiple cooling flow channels are communicated with the oil inlet hole of one balance plate and the oil throwing hole of the other balance plate respectively. The balance plate is arranged to form the oil inlet hole and the oil throwing hole, cooling oil can flow to the cooling flow channel from the oil inlet hole, the cooling oil exchanges heat with the rotor core and then flows out of the oil throwing hole, the structure is simple, the development cost is low, uniform heat dissipation of the rotor core is facilitated, the cooling oil enters the rotor core and directly cools the rotor core, and the service life of the rotor core is prolonged. The cooling efficiency of the cooling oil can be improved, so that the risk of low working efficiency of the motor caused by temperature rise of the rotor core is effectively reduced.

Description

Technical Field

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

[0002] In the related art, the motor generates heat during operation. The increase in motor temperature can easily lead to a decrease in motor efficiency or even motor failure. The heat of the water-cooled motor can only be transferred to the motor housing through air for cooling, and the motor rotor cannot be directly cooled, resulting in low heat dissipation efficiency. For oil-cooled motors, especially oil-cooled motors installed on coaxial electric drive axles, since the half shaft of the drive axle needs to pass through the middle of the motor shaft, the cooling oil cannot flow into the inside of the motor shaft, and the rotor core is cooled by opening corresponding oil holes on the motor shaft to connect to the inside of the rotor. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a rotor assembly of a motor, which directly cools the rotor core, dissipates heat uniformly from the rotor core, and effectively reduces the risk of low working efficiency of the motor.

[0004] The utility model further provides a motor.

[0005] The utility model further provides a vehicle.

[0006] According to an embodiment of the present invention, a rotor assembly of an electric motor includes: a rotor core, which is formed with a plurality of cooling channels; a rotating shaft, which passes through the rotor core and is fixed to the rotor core; two balancing plates, which are fixed to the rotating shaft and spaced apart along the axial direction of the rotating shaft, and the rotor core is located between the two balancing plates, each balancing plate is formed with an oil inlet hole and an oil throwing hole, and the plurality of cooling channels are respectively connected to the oil inlet hole of one balancing plate and the oil throwing hole of the other balancing plate.

[0007] According to an embodiment of the present invention, a rotor assembly of a motor is provided with an oil inlet hole and an oil-slinging hole by setting a balancing plate, so that cooling oil can flow from the oil inlet hole to the cooling channel, and the cooling oil flows out from the oil-slinging hole after heat exchange with the rotor core. The structure is simple and the development cost is low, which is beneficial to uniform heat dissipation of the rotor core. Moreover, the cooling oil enters the rotor core and directly cools the rotor core, which can improve the cooling efficiency of the cooling oil, thereby effectively reducing the risk of low working efficiency of the motor due to increased temperature of the rotor core.

[0008] In some embodiments of the utility model, an oil collecting groove is formed on a side of each balancing plate away from the rotor core along the axial direction of the rotating shaft, and the oil collecting groove is communicated with the corresponding oil inlet hole.

[0009] In some embodiments of the present invention, an oil inlet hole is formed on the bottom wall of the oil collecting tank.

[0010] In some embodiments of the utility model, an oil outlet groove is formed on a side of each balancing plate facing the rotor core along the axial direction of the rotating shaft, and the oil outlet groove is connected to the corresponding cooling channel and the corresponding oil throwing hole.

[0011] In some embodiments of the present invention, the oil outlet groove extends in the radial direction of the corresponding balancing plate.

[0012] In some embodiments of the present invention, the oil-slinging holes extend obliquely toward the radial outer side of the corresponding balancing plate from a side of the balancing plate facing the rotor core to a side away from the rotor core.

[0013] In some embodiments of the present invention, the two balancing boards have the same structure.

[0014] In some embodiments of the present invention, each balancing plate is formed with a plurality of oil inlet holes and a plurality of oil-slinging holes, and the plurality of cooling channels, the plurality of oil inlet holes and the plurality of oil-slinging holes correspond to each other one by one.

[0015] A motor according to an embodiment of the present invention includes the rotor assembly of the motor of the above embodiment.

[0016] A vehicle according to an embodiment of the present invention comprises the motor of the above embodiment.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 is a cross-sectional view of a rotor assembly according to an embodiment of the utility model;

[0020] Figure 2 is a schematic diagram of the structure of a balance board according to an embodiment of the utility model;

[0021] Figure 3 is a side view of a balance board according to an embodiment of the utility model;

[0022] Figure 4 is a cross-sectional view of a balance board according to an embodiment of the utility model;

[0023] Figure 5 It is a schematic diagram of the rotating shaft structure according to an embodiment of the utility model.

[0024] Reference numerals:

[0025] Rotor assembly 100;

[0026] Rotor core 1;

[0027] Cooling channel 11;

[0028] Axis 2;

[0029] Keyway 21;

[0030] Balance board 3;

[0031] Oil inlet hole 31; oil throwing hole 32; oil collecting groove 33; oil outlet groove 34; assembly part 35; through hole 36;

[0032] Press ring 4. DETAILED DESCRIPTION

[0033] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0034] Reference below Figure 1-Figure 5 A rotor assembly 100 according to an embodiment of the present invention is described, and the rotor assembly 100 is applied to a motor.

[0035] like Figure 1-Figure 5 As shown, a rotor assembly 100 of an electric motor according to an embodiment of the present invention includes: a rotor core 1, the rotor core 1 is formed with a plurality of cooling channels 11; a rotating shaft 2, the rotating shaft 2 is passed through the rotor core 1 and fixed to the rotor core 1; two balancing plates 3, the two balancing plates 3 are fixed to the rotating shaft 2 and are spaced apart along the axial direction of the rotating shaft 2, the rotor core 1 is located between the two balancing plates 3, each balancing plate 3 is formed with an oil inlet hole 31 and an oil throwing hole 32, and the plurality of cooling channels 11 are respectively connected to the oil inlet hole 31 of one balancing plate 3 and the oil throwing hole 32 of another balancing plate 3.

[0036] Among them, the rotor assembly 100 includes a rotor core 1, a rotating shaft 2 and two balancing plates 3. The rotor core 1 is formed with a plurality of cooling channels 11. For example, the rotor core 1 can be formed with two, three or more cooling channels 11. The present application takes the rotor core 1 as an example in which three cooling channels 11 are formed. The three cooling channels 11 can be evenly arranged along the circumference of the rotor core 1. The three cooling channels 11 can extend along the axial direction of the rotor core 1. The three cooling channels 11 penetrate the rotor core 1 along the axial direction of the rotor core 1. The cooling oil flows through the three cooling channels 11, which is beneficial to the uniform heat dissipation of the rotor core 1. As some embodiments of the present application, the rotating shaft 2 can be constructed as a hollow shaft. The rotating shaft 2 is passed through the rotor core 1 and fixed to the rotor core 1. As some embodiments of the present application, the rotor core 1 can be formed by multiple rotor punchings stacked along the axial direction of the rotor core 1, the rotor core 1 is formed with a cam, and a keyway 21 can be formed on the rotating shaft 2, the cam is assembled in the keyway 21, the rotor core 1 and the rotating shaft 2 are interference fit and fixed to the rotating shaft 2 by the cam, so that the rotating shaft 2 and the rotor core 1 rotate synchronously, reducing the risk of noise and vibration generated by the asynchronous rotation of the rotating shaft 2 and the rotor core 1, and can also reduce the energy loss caused by the relative movement of the rotating shaft 2 and the rotor core 1, which is beneficial to improving the working efficiency of the motor.

[0037] The two balancing plates 3 are fixed on the rotating shaft 2. As some embodiments of the present application, the balancing plates 3 can be formed by machining after stamping of aluminum alloy. A through hole 36 can be formed on the balancing plate 3. The rotating shaft 2 is passed through the through hole 36 and the rotating shaft 2 and the through hole 36 are loosely matched. An assembly groove can be formed on the rotating shaft 2. The assembly groove can be configured as the key groove 21 of the above embodiment. The two balancing plates 3 are formed with an assembly part 35. The assembly part 35 can also be configured as a convex key structure. The size and shape of the convex key are adapted to the size and shape of the key groove 21, so that the convex key and the key groove 21 can be assembled together, so that the two balancing plates 3 are fixed on the rotating shaft 2. Furthermore, the key groove 21 and the convex key can be set to multiple, and the multiple key grooves 21 correspond to the multiple convex keys one by one, so as to improve the connection reliability between the balancing plate 3 and the rotating shaft 2 and reduce the risk of separation between the balancing plate 3 and the rotating shaft 2. The two balancing plates 3 are spaced apart along the axial direction of the rotating shaft 2, and the rotor core 1 is located between the two balancing plates 3. That is to say, the two balancing plates 3 are respectively arranged at both ends of the rotor core 1, which is conducive to the balancing plates 3 to reliably play a balancing role on both sides of the rotor core 1 and improve the stability of the motor operation.

[0038] Each balancing plate 3 is formed with an oil inlet hole 31 and an oil-slinging hole 32. The number of the oil inlet holes 31 on each balancing plate 3 is the same as the number of the cooling channels 11, and the number of the oil-slinging holes 32 on each balancing plate 3 is the same as the number of the cooling channels 11, so that the multiple cooling channels 11 are respectively connected to the oil inlet hole 31 of one balancing plate 3 and the oil-slinging hole 32 of another balancing plate 3. The cooling oil can flow from the oil inlet hole 31 of one balancing plate 3 into the cooling channel 11 and directly exchange heat with the rotor core 1 and the magnetic steel. After the heat exchange is completed, the cooling oil flows out of the cooling channel 11 from the oil-slinging hole 32 of another balancing plate 3 and directly cools the stator end winding, effectively reducing the temperature of the rotor core 1, the stator winding and the magnetic steel, and improving the cooling efficiency of the motor. Furthermore, since the magnetic steel can be cooled by the cooling oil, the magnetic steel with a lower temperature resistance grade can be assembled in the motor, which is conducive to reducing the production cost of the motor.

[0039] Specifically, the rotor core 1 is formed with three cooling channels 11, and the three cooling channels 11 are evenly arranged along the circumference of the rotor core 1, which is conducive to uniform heat dissipation of the rotor core 1. The rotating shaft 2 is passed through the rotor core 1 and fixed to the rotor core 1 by a convex key, so that the rotor core 1 and the rotating shaft 2 rotate synchronously, reducing the risk of noise and vibration when the rotating shaft 2 is not synchronized with the rotor core 1. The two balancing plates 3 can also be fixed to the rotating shaft 2 by a convex key, so that the balancing plates 3 and the rotating shaft 2 rotate synchronously, and the two balancing plates 3 are spaced apart along the axial direction of the rotating shaft 2, and the rotor core 1 is located between the two balancing plates 3, so that the balancing plates 3 can reliably play a balancing role on both sides of the rotor core 1, thereby improving the stability of the motor operation. Each balancing plate 3 is formed with three oil inlet holes 31 and three oil-swing holes 32. The multiple cooling channels 11 are respectively connected to an oil inlet hole 31 of one balancing plate 3 and an oil-swing hole 32 of another balancing plate 3. The cooling oil flows into the cooling channel 11 from the oil inlet hole 31 of one balancing plate 3 and directly exchanges heat with the rotor core 1. After the heat exchange is completed, the cooling oil flows out of the cooling channel 11 from the oil-swing hole 32 of the other balancing plate 3 and directly cools the stator end winding, thereby effectively reducing the temperature of the rotor core 1, the stator winding and the magnetic steel, and improving the cooling efficiency of the motor.

[0040] Furthermore, the rotor assembly 100 may also include two pressure rings 4. Along the axial direction of the rotating shaft 2, the two pressure rings 4 are respectively arranged on the side of the two balancing plates 3 away from the rotor core 1. By pressing the corresponding balancing plates 3 by the pressure rings 4, the balancing plates 3 and the rotor core 1 can be tightly fitted, reducing the risk of gaps between the balancing plates 3 and the rotor core 1 causing poor flow of cooling oil, and can also reduce the risk of noise when the motor is working, which is beneficial to improving the stability of the motor operation.

[0041] Therefore, by setting the balance plate 3 to form an oil inlet hole 31 and an oil-slinging hole 32, the cooling oil can flow from the oil inlet hole 31 to the cooling channel 11, and the cooling oil flows out from the oil-slinging hole 32 after heat exchange with the rotor core 1. The structure is simple and the development cost is low, which is beneficial to uniform heat dissipation of the rotor core 1. In addition, the cooling oil enters the rotor core 1 and directly cools the rotor core 1, which can improve the cooling efficiency of the cooling oil, thereby effectively reducing the risk of low working efficiency of the motor due to increased temperature of the rotor core 1.

[0042] As some embodiments of the present application, the rotor assembly 100 proposed in the present application is applied to a motor, and the motor can be used as an oil-cooled motor arranged on a coaxial electric drive axle. As some embodiments of the present application, the half shaft of the vehicle can be passed through the rotating shaft 2.

[0043] In some embodiments of the present invention, Figure 1 , Figure 2 and Figure 4 As shown, along the axial direction of the rotating shaft 2 , an oil collecting groove 33 is formed on a side of each balancing plate 3 away from the rotor core 1 , and the oil collecting groove 33 is communicated with the corresponding oil inlet hole 31 .

[0044] Among them, along the axial direction of the rotating shaft 2, each balancing plate 3 is formed with an oil collecting groove 33, and after the oil is thrown up, the oil can flow into the oil collecting groove 33. The oil collecting groove 33 is formed on the side away from the rotor core 1, and the oil collecting groove 33 is open in the direction away from the rotor core 1. The oil collecting groove 33 is connected with the oil inlet hole 31 of the corresponding balancing plate 3. When the cooling oil is thrown to the end face of the side of the balancing plate 3 away from the rotor core 1, the centrifugal force generated by the rotation of the balancing plate 3 will cause the cooling oil to move along the radial direction of the balancing plate 3. The oil collecting groove 33 collects the cooling oil in the groove and flows into the cooling channel 11 of the rotor core 1 through the corresponding oil inlet hole 31, reducing the risk of the cooling oil being directly thrown out of the rotor assembly 100, so that the cooling oil can smoothly flow into the cooling channel 11 of the rotor core 1, and the cooling oil exchanges heat with the rotor core 1 in the cooling channel 11, so that the rotor core 1 is kept within a reasonable temperature range. As some embodiments of the present application, the cross-section of the oil collecting groove 33 is circular, so that the structure of the oil collecting groove 33 can be reasonable and the cooling oil can be effectively collected.

[0045] In some embodiments of the present invention, Figure 1-Figure 4 As shown, the bottom wall of the oil collecting groove 33 is formed with an oil inlet hole 31 .

[0046] The bottom wall of the oil collecting groove 33 is formed with an oil inlet hole 31, and the oil collecting groove 33 collects the cooling oil in the groove. By forming the oil inlet hole 31 on the bottom wall of the oil collecting groove 33, the cooling oil in the oil collecting groove 33 can flow into the cooling channel 11 through the oil inlet hole 31. As some embodiments of the present application, the oil inlet hole 31 can be formed at the outer edge of the bottom wall of the oil collecting groove 33. Specifically, the balance plate 3 is fixed to the rotating shaft 2, and the balance plate 3 rotates with the rotating shaft 2. The cooling oil in the oil collecting groove 33 will move toward the peripheral wall of the oil collecting groove 33 under the action of centrifugal force. The oil inlet hole 31 is formed at the outer edge of the bottom wall of the oil collecting groove 33, which is conducive to the cooling oil flowing smoothly from the oil collecting groove 33 into the oil inlet hole 31, so that the cooling oil can flow smoothly into the rotor core 1.

[0047] In some embodiments of the present invention, Figure 1 , Figure 3 and Figure 4 As shown, along the axial direction of the rotating shaft 2 , an oil outlet groove 34 is formed on a side of each balancing plate 3 facing the rotor core 1 , and the oil outlet groove 34 communicates with the corresponding cooling channel 11 and the corresponding oil throwing hole 32 .

[0048] Among them, along the axial direction of the rotating shaft 2, each balancing plate 3 is formed with an oil outlet groove 34, and the oil outlet groove 34 is formed on the side facing the rotor core 1. The cooling oil in the cooling channel 11 can flow to the oil-swinging hole 32 through the oil outlet groove 34, and then flow out of the rotor core 1. The oil outlet groove 34 connects the corresponding cooling channel 11 and the corresponding oil-swinging hole 32. The cooling oil exchanges heat with the rotor core 1 in the cooling channel 11 and flows to the oil outlet groove 34, and flows out of the cooling channel 11 through the corresponding oil-swinging hole 32, which is conducive to the smooth flow of the cooling oil in the rotor assembly 100, so that the cooling oil continues to cool the motor.

[0049] As some embodiments of the present application, one side of the balancing plate 3 is formed with an oil collecting groove 33 as the outer end surface of the balancing plate 3, and one side of the balancing plate 3 is formed with an oil outlet groove 34 as the inner end surface of the balancing plate 3, and the inner end surface of the balancing plate 3 is in contact with the rotor core 1.

[0050] In some embodiments of the present invention, Figure 1 As shown, the oil outlet groove 34 extends in the radial direction of the corresponding balancing plate 3 .

[0051] Among them, the oil outlet groove 34 can extend along the radial direction of the corresponding balance plate 3. As some embodiments of the present application, the oil outlet groove 34 has two opposite ends, one end of the oil outlet groove 34 is connected to the cooling channel 11, and the other opposite end of the oil outlet groove 34 is connected to the corresponding oil-slinging hole 32, which is conducive to the smooth flow of cooling oil in the oil outlet groove 34 along the radial direction of the balance plate 3, reduces the risk of cooling oil forming eddy currents in the oil outlet groove 34, allows the cooling oil to flow smoothly from the oil outlet groove 34 to the oil-slinging hole 32, allows the cooling oil to circulate, and improves the cooling reliability of the motor.

[0052] In some embodiments of the present invention, Figure 1 and Figure 3 As shown, the oil-slinging holes 32 extend obliquely toward the radial outer side of the corresponding balancing plate 3 from the side of the balancing plate 3 facing the rotor core 1 to the side away from the rotor core 1 .

[0053] Among them, from the side of the balance plate 3 facing the rotor core 1 to the side away from the rotor core 1, the oil-throwing hole 32 extends obliquely toward the radial outer side of the corresponding balance plate 3. The oblique extension is conducive to the oblique throwing out of the cooling oil under the action of centrifugal force, so that it can be thrown out reliably and accurately to the stator end winding, which is conducive to the direct cooling of the stator end winding after the cooling oil flows out of the cooling channel 11, effectively reducing the temperature of the rotor core 1 and the stator winding, and improving the cooling efficiency of the motor.

[0054] In some embodiments of the present invention, Figure 1 As shown, the two balancing boards 3 have the same structure.

[0055] Among them, the two balancing plates 3 have the same structure, so that the weight of the two balancing plates 3 can be the same, which can improve the working stability of the rotor assembly 100, and the cooling oil flows into the cooling channel 11 from the oil inlet hole 31 of one of the balancing plates 3, and flows out of the cooling channel 11 from the oil throwing hole 32 of the other balancing plate 3. The same structure of the two balancing plates 3 can keep the flow of cooling oil in the cooling channel 11 stable, improve the temperature uniformity of the rotor core 1, and reduce the risk of large temperature difference at different positions of the rotor core 1, thereby improving the working performance of the motor, and the number of molds for producing the balancing plates 3 can be reduced, which can reduce the production cost.

[0056] In some embodiments of the present invention, Figure 2 and Figure 3 As shown, each balancing plate 3 is formed with a plurality of oil inlet holes 31 and a plurality of oil-slinging holes 32 , and the plurality of cooling channels 11 , the plurality of oil inlet holes 31 and the plurality of oil-slinging holes 32 correspond one to one.

[0057] Each balancing plate 3 is formed with a plurality of oil inlet holes 31 and a plurality of oil-slinging holes 32, for example, each balancing plate 3 is formed with two oil inlet holes 31 and two oil-slinging holes 32, or each balancing plate 3 is formed with three oil inlet holes 31 and three oil-slinging holes 32, but the present application is not limited thereto, each balancing plate 3 may also be formed with more oil inlet holes 31 and more oil-slinging holes 32, as long as each balancing plate 3 is formed with a plurality of oil inlet holes 31 and a plurality of oil-slinging holes 32, the present application takes each balancing plate 3 as an example in which three oil inlet holes 31 and three oil-slinging holes 32 are formed, as an embodiment of the present application, the three oil inlet holes 31 and the three oil-slinging holes 32 are evenly arranged along the circumference of the balancing plate 3. As an embodiment of the present application, along the circumference of the balancing plate 3, an oil-slinging hole 32 is arranged between every two adjacent oil inlet holes 31. Along the radial direction of the balancing plate 3, the oil inlet hole 31 and the oil-swinging hole 32 are staggered. As an embodiment of the present application, along the radial direction of the balancing plate 3, the oil-swinging hole 32 is located outside the oil inlet hole 31, so that the balancing plate 3 can freely arrange the number of the oil inlet holes 31 and the oil-swinging holes 32 according to the cooling requirements of the rotor core 1, thereby improving the rationality of the layout of the rotor assembly 100.

[0058] Multiple cooling channels 11, multiple oil inlet holes 31 and multiple oil-slinging holes 32 correspond one to one, that is, one cooling channel 11 corresponds to one oil inlet hole 31 and one oil-slinging hole 32, so that the cooling oil flows into the corresponding cooling channel 11 from the oil inlet hole 31 of one balancing plate 3 and directly exchanges heat with the rotor core 1 and the magnetic steel. After the heat exchange is completed, the cooling oil flows out of the cooling channel 11 from the corresponding oil-slinging hole 32 of another balancing plate 3 and directly cools the stator end winding, effectively reducing the temperature of the rotor core 1, the stator winding and the magnetic steel, and improving the cooling efficiency of the motor.

[0059] A motor according to an embodiment of the present invention includes a rotor assembly 100 of the motor of the above embodiment. As some embodiments of the present application, along the axial direction of the rotating shaft 2, oil injection rings can be respectively provided on both sides of the rotor assembly 100, and oil injection holes are provided on the oil injection rings. The oil injection holes can spray oil toward the outer end surface of the balance plate 3. The cooling oil flows to the oil inlet hole 31 of the bottom wall of the oil collecting tank 33 under the action of centrifugal force, and flows from the oil inlet hole 31 to the cooling channel 11. The cooling oil flows out from the oil throwing hole 32 after heat exchange with the rotor core 1. The structure is simple, the development cost is low, and it is conducive to uniform heat dissipation of the rotor core 1. In addition, the cooling oil enters the rotor core 1 and directly cools the rotor core 1, which can improve the cooling efficiency of the cooling oil, thereby effectively reducing the risk of low working efficiency of the motor due to the increase in the temperature of the rotor core 1.

[0060] Furthermore, by providing an oil collecting groove 33, an oil inlet hole 31, an oil outlet groove 34 and an oil throwing hole 32 on the balance plate 3, the weight of the balance plate 3 can be reduced, which is beneficial to the lightweight design of the motor. Moreover, without adding a new oil circuit structure, the rotor assembly 100 can have both oil inlet and oil throwing functions, with a simple structure and convenient processing, saving the size and development cost of the motor.

[0061] A vehicle according to an embodiment of the present invention includes the motor of the above embodiment. By setting the balance plate 3 to form an oil inlet hole 31 and an oil-slinging hole 32, the cooling oil can flow from the oil inlet hole 31 to the cooling channel 11, and the cooling oil flows out from the oil-slinging hole 32 after heat exchange with the rotor core 1. The structure is simple and the development cost is low, which is conducive to uniform heat dissipation of the rotor core 1. In addition, the cooling oil enters the rotor core 1 and directly cools the rotor core 1, which can improve the cooling efficiency of the cooling oil, thereby effectively reducing the risk of low motor working efficiency due to increased temperature of the rotor core 1, thereby improving vehicle performance.

[0062] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0063] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A rotor assembly (100) of an electric motor, characterized in that: include: A rotor core (1), wherein the rotor core (1) is formed with a plurality of cooling channels (11); A rotating shaft (2), the rotating shaft (2) passing through the rotor core (1) and being fixed to the rotor core (1); Two balancing plates (3), the two balancing plates (3) are fixedly arranged on the rotating shaft (2) and spaced apart along the axial direction of the rotating shaft (2), the rotor core (1) is located between the two balancing plates (3), each balancing plate (3) is formed with an oil inlet hole (31) and an oil throwing hole (32), and a plurality of cooling channels (11) are respectively connected to the oil inlet hole (31) of one balancing plate (3) and the oil throwing hole (32) of another balancing plate (3).

2. The rotor assembly (100) of the electric machine according to claim 1, characterized in that: An oil collecting groove (33) is formed on a side of each balancing plate (3) facing away from the rotor core (1) along the axial direction of the rotating shaft (2), and the oil collecting groove (33) is communicated with the corresponding oil inlet hole (31).

3. The rotor assembly (100) of the electric machine according to claim 2, characterized in that: The bottom wall of the oil collecting groove (33) is formed with the oil inlet hole (31).

4. The rotor assembly (100) of the electric machine according to claim 1, characterized in that: An oil outlet groove (34) is formed on a side of each balancing plate (3) facing the rotor core (1) along the axial direction of the rotating shaft (2), and the oil outlet groove (34) is connected to the corresponding cooling channel (11) and the corresponding oil throwing hole (32).

5. The rotor assembly (100) of the electric machine according to claim 4, characterized in that: The oil outlet groove (34) extends in the radial direction of the corresponding balancing plate (3).

6. The rotor assembly (100) of the electric machine according to claim 1, characterized in that: From the side of the balancing plate (3) facing the rotor core (1) to the side away from the rotor core (1), the oil-slinging hole (32) extends obliquely toward the radial outer side of the corresponding balancing plate (3).

7. The rotor assembly (100) of the electric machine according to claim 1, characterized in that: The two balancing plates (3) have the same structure.

8. The rotor assembly (100) of the electric machine according to any one of claims 1 to 7, characterized in that: Each of the balancing plates (3) is formed with a plurality of the oil inlet holes (31) and a plurality of the oil-slinging holes (32), and the plurality of the cooling channels (11), the plurality of the oil inlet holes (31) and the plurality of the oil-slinging holes (32) correspond one to one.

9. A motor, characterized in that: A rotor assembly (100) comprising an electric machine according to any one of claims 1-8.

10. A vehicle, characterized in that: Comprising an electric machine according to claim 9.

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