An electric motor and a vehicle

Abstract

This application provides an electric motor and a vehicle. The electric motor includes a stator, a rotor, a shaft, and end plates. The stator surrounds the outer periphery of the rotor. The shaft passes through the rotor and forms a conveying oil passage. End plates are provided on opposite sides of the rotor along the axial direction. Cooling oil grooves are formed on the side of the end plates facing the rotor and are connected to the conveying oil passage. The end plates have mounting holes, and the shaft passes through the mounting holes. One of the inner circumferential surface of the mounting hole and the outer circumferential surface of the shaft forms a rotation-limiting protrusion, and the other forms a rotation-limiting groove. The rotation-limiting protrusion is located within the rotation-limiting groove to limit the rotation of the end plates relative to the shaft. According to the electric motor of this application, the pre-positioning of the end plates on the shaft can be achieved through the cooperation of the rotation-limiting protrusion and the rotation-limiting groove, thereby improving the installation position accuracy of the end plates and simultaneously completing the positioning between the cooling oil groove and the conveying oil passage. This reduces the assembly difficulty of the electric motor and improves assembly efficiency.

Description

Technical Field

[0001] This application relates to the field of electrical machinery technology, and in particular to an electric motor and a vehicle. Background Technology

[0002] With the continuous development of new energy vehicle technology, motors, as a core component of new energy vehicles, are also developing towards higher torque density and higher power density. At the same time, higher requirements are placed on the cooling and heat dissipation capabilities of motors. In related technologies, motors typically have cooling flow paths set on different components, and the heat generated by the motor is absorbed through the flow of cooling medium. However, since the cooling flow paths on different components need to be connected, the precision requirements for motor assembly also increase, leading to a decrease in motor assembly efficiency. Summary of the Invention

[0003] This application provides an electric motor and a vehicle, which aim to improve the problem of low assembly efficiency of the electric motor.

[0004] In a first aspect, this application provides an electric motor, comprising: a stator and a rotor, the stator surrounding the outer periphery of the rotor; a shaft passing through the rotor and forming an oil delivery passage; end plates, each provided on opposite sides of the rotor along its axial direction, the end plates having cooling oil grooves formed on their sides facing the rotor, the cooling oil grooves communicating with the oil delivery passage; wherein, the end plates have mounting holes, the shaft passing through the mounting holes, one of the inner peripheral surface of the mounting hole and the outer peripheral surface of the shaft forming a rotation-limiting protrusion, the other forming a rotation-limiting groove, the rotation-limiting protrusion being located within the rotation-limiting groove to restrict the rotation of the end plate relative to the shaft.

[0005] In the above technical solution, the pre-positioning of the end plate on the rotating shaft can be achieved by the cooperation of the rotation limiting protrusion and the rotation limiting groove, thereby improving the installation position accuracy of the end plate. In addition, the positioning between the cooling oil tank and the conveying oil circuit can be completed simultaneously, which simplifies the installation process of the end plate and reduces the assembly difficulty of the motor to improve the assembly efficiency.

[0006] In some embodiments, both the rotation limiting protrusion and the rotation limiting groove are provided with a plurality of protrusions arranged circumferentially along the rotation axis.

[0007] In some embodiments, the oil conveying circuit includes a conveying cavity and a conveying hole. The conveying cavity is formed inside the rotating shaft and has an oil inlet located on one end face of the rotating shaft. The conveying hole penetrates the outer peripheral wall of the conveying cavity. The inner peripheral surface of the mounting hole forms an oil inlet communicating with the cooling oil tank. The conveying hole and the oil inlet are arranged opposite to each other in a one-to-one correspondence.

[0008] In some embodiments, the oil inlet is provided with an oil injection nozzle, which forms an oil injection channel extending axially along the rotating shaft. The cross-sectional area of ​​the oil injection channel gradually decreases along the direction from the oil inlet to the delivery cavity.

[0009] In some embodiments, the rotor includes an iron core and a permanent magnet. An mounting groove for accommodating the permanent magnet is formed on the axial end face of the iron core. The projection of the mounting groove onto a reference plane is spaced apart from the projection of the cooling oil groove onto the reference plane. The reference plane is perpendicular to the axial direction of the rotating shaft.

[0010] In some embodiments, the cooling oil tank includes a first oil tank and a plurality of second oil tanks, the plurality of second oil tanks being arranged at intervals along the circumference of the rotating shaft, the first oil tank being annularly extending along the circumference of the rotating shaft and communicating with the conveying oil passage, and the plurality of second oil tanks being located on the outer periphery of the first oil tank and communicating with the first oil tank.

[0011] In some embodiments, the second oil trough has an oil drain hole on the bottom wall facing the rotor, and the second oil trough communicates with the outside of the end plate through the oil drain hole.

[0012] In some embodiments, the second oil sump includes a connecting section and two branch sections. The branch sections are located on the side of the connecting section away from the first oil sump and communicate with the first oil sump through the connecting section. The connecting section extends radially along the rotating shaft. The branch sections are inclined relative to the connecting section. Along the direction from the central axis of the rotor to the outer peripheral surface of the rotor, the two branch sections extend inclinedly in a direction away from each other. The oil drain hole is located at the end of the branch section away from the connecting section.

[0013] In some embodiments, the cooling oil tank further includes a plurality of third oil tanks, which are evenly spaced along the circumference of the rotating shaft on the inner circumferential side of the first oil tank. The third oil tanks extend radially along the rotating shaft, with one end of the third oil tank communicating with the first oil tank and the other end of the third oil tank extending to the inner circumferential surface of the mounting hole to form an oil inlet, which is communicating with the conveying oil passage.

[0014] In some embodiments, the number of third oil grooves is the same as that of the second oil grooves and they correspond one-to-one. Along the radial direction of the rotating shaft, the connecting segments of the third oil grooves and the corresponding second oil grooves are arranged opposite to each other; and / or, along the circumferential direction of the rotating shaft, the width of the connecting segment is greater than the width of the third oil groove.

[0015] In some embodiments, the oil drain hole extends obliquely in a direction away from the rotor, and one end of the oil drain hole away from the cooling oil groove extends to the side of the end plate opposite to the rotor.

[0016] In some embodiments, a plurality of the second oil grooves are arranged at uniform intervals along the circumference of the axis of rotation.

[0017] In some embodiments, the two end plates are a first end plate and a second end plate, respectively. Along the circumference of the rotation axis, the projection of a single second oil groove of the first end plate onto the reference surface is a first projection, and the projection of a single second oil groove of the second end plate onto the reference surface is a second projection. A plurality of first projections and a plurality of second projections are arranged alternately along the circumference of the rotation axis.

[0018] Secondly, this application provides a vehicle including: the motor described in the first aspect embodiment above.

[0019] In the above technical solution, the pre-positioning of the end plate on the rotating shaft can be achieved by the cooperation of the rotation limiting protrusion and the rotation limiting groove, thereby improving the installation position accuracy of the end plate. In addition, the positioning between the cooling oil tank and the conveying oil circuit can be completed simultaneously, which simplifies the installation process of the end plate and reduces the assembly difficulty of the motor to improve the assembly efficiency.

[0020] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0021] Figure 1 This is a cross-sectional view of a motor according to an embodiment of this application;

[0022] Figure 2 This is a schematic diagram of the side of the end plate of the motor facing the rotor according to an embodiment of this application; Figure 3 yes Figure 2 Enlarged view of region A in the middle; Figure 4 yes Figure 2 A cross-sectional view along the middle BB.

[0023] Figure label: 100. Electric motor; 1. Rotor; 11. Iron core; 12. Permanent magnet; 2. Rotating shaft; 21. Oil conveying passage; 211. Conveying chamber; 2111. Oil inlet; 212. Conveying hole; 22. Oil injection nozzle; 221. Oil injection channel; 3. End plate; 31. Cooling oil tank; 311. First oil tank; 312. Second oil tank; 3121. Connecting section; 3122. Branch section; 313. Third oil tank; 3131. Oil inlet; 32. Mounting hole; 321. Rotation limiting protrusion; 33. Oil drain hole; 4. Tighten the nut. Detailed Implementation

[0024] To make the technical problems, technical solutions, and beneficial effects solved by this application clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0025] The vehicle according to a second aspect of this application is described below with reference to the accompanying drawings.

[0026] like Figures 1 to 4 As shown, the motor 100 according to the first aspect embodiment of this application includes: a stator (not shown), a rotor 1, a shaft 2, and an end plate 3. The stator surrounds the outer periphery of the rotor 1, and the shaft 2 passes through the rotor 1, forming a conveying oil passage 21. The rotor 1 has end plates 3 on opposite sides along the axial direction, and the side of the end plate 3 facing the rotor 1 forms a cooling oil groove 31, which is connected to the conveying oil passage 21. That is, the cooling medium can enter the cooling oil groove 31 through the conveying oil passage 21. The conveying oil passage 21 can be connected to an external cooling medium conveying device such as an oil pump to ensure a stable supply of cooling medium. Since the cooling oil groove 31 is formed on the side of the end plate 3 facing the rotor 1, the cooling medium entering the cooling oil groove 31 can contact the rotor 1, absorb the heat at the rotor 1, and cool the rotor 1. This avoids the risk of demagnetization of the permanent magnet 12 of the rotor 1 due to overheating, thereby improving the reliability of the motor 100 operation.

[0027] The end plate 3 has a mounting hole 32, through which the rotating shaft 2 passes. A limiting rotation protrusion 321 is formed on one of the inner circumferential surface of the mounting hole 32 and the outer circumferential surface of the rotating shaft 2, while a limiting rotation groove is formed on the other. The limiting rotation protrusion 321 is located within the limiting rotation groove to restrict the rotation of the end plate 3 relative to the rotating shaft 2. In other words, during the process of fitting the end plate 3 onto the rotating shaft 2, after aligning the limiting rotation protrusion 321 with the limiting rotation groove, the end plate 3 is pushed axially along the rotating shaft 2 to allow the limiting rotation protrusion 321 to enter the limiting rotation groove. This achieves the pre-positioning of the end plate 3 on the rotating shaft 2, thereby improving the installation position accuracy of the end plate 3. Furthermore, it can be designed that when the rotation limiting protrusion 321 is located in the rotation limiting groove, the cooling oil groove 31 is connected to the conveying oil passage 21. That is, through the cooperation of the rotation limiting protrusion 321 and the rotation limiting groove, the positioning between the cooling oil groove 31 and the conveying oil passage 21 can be completed simultaneously, so as to simplify the installation process of the end plate 3, thereby reducing the assembly difficulty of the motor 100 and improving the assembly efficiency.

[0028] In the above technical solution, the pre-positioning of the end plate 3 on the rotating shaft 2 can be achieved by the cooperation of the rotation limiting protrusion 321 and the rotation limiting groove, thereby improving the installation position accuracy of the end plate 3. In addition, the positioning between the cooling oil tank 31 and the conveying oil circuit 21 can be completed simultaneously, so as to simplify the installation process of the end plate 3 and reduce the assembly difficulty of the motor 100 to improve the assembly efficiency.

[0029] In some embodiments of this application, both the rotation-limiting protrusions 321 and the rotation-limiting grooves are provided in multiple locations spaced apart along the circumference of the rotating shaft 2. That is, the multiple rotation-limiting protrusions 321 correspond one-to-one with the multiple rotation-limiting grooves to jointly restrict the free movement of the end plate 3 relative to the rotating shaft 2 along its circumference. This improves the installation position accuracy of the end plate 3 relative to the rotating shaft 2 along its circumference, i.e., enhances the positioning effect between the end plate 3 and the rotating shaft 2, ensuring the positioning accuracy between the cooling oil groove 31 and the oil delivery passage 21. Furthermore, the connection position between the end plate 3 and the rotating shaft 2 can be increased, thereby improving the stability of the connection between the end plate 3 and the rotating shaft 2 and preventing abnormal noises caused by the rotation of the end plate 3 relative to the rotating shaft 2.

[0030] In a specific example, the motor 100 also includes a locking nut 4. An external thread that mates with the locking nut 4 is formed on the outer circumferential surface of the connecting shaft. The external thread is located on the side of the end plate 3 away from the rotor 1. By tightening the locking nut 4, the end plate 3 can be pressed onto the rotor 1 to securely fix the end plate 3. This can prevent the cooling medium in the cooling oil tank 31 from leaking to the outside of the cooling oil tank 31, allowing the cooling medium to flow stably along a set path to absorb heat.

[0031] In some embodiments of this application, the oil conveying passage 21 includes a conveying cavity 211 and a conveying hole 212. The conveying cavity 211 is formed inside the rotating shaft 2 and has an oil inlet 2111 located on one end face of the rotating shaft 2. The conveying hole 212 penetrates the outer peripheral wall of the conveying cavity 211. The inner peripheral surface of the mounting hole 32 has an oil inlet 3131 that communicates with the cooling oil tank 31. The conveying hole 212 and the oil inlet 3131 are arranged opposite to each other. That is, the external cooling medium enters the conveying cavity 211 through the oil inlet 2111. As the injected cooling medium gradually increases and the rotating shaft 2 rotates, the cooling medium in the conveying cavity 211 can enter the cooling oil tank 31 through the conveying hole 212 and the oil inlet 3131 in sequence under the action of pressure and centrifugal force, thereby conveying the cooling medium in the oil conveying passage 21 to the cooling oil tank 31 to cool the rotor 1.

[0032] In a specific example, each end plate 3 is provided with multiple oil inlets 3131 arranged circumferentially along the shaft 2. The shaft 2 is provided with two sets of holes arranged axially along the shaft 2. Each set of holes includes multiple conveying holes 212 arranged circumferentially along the shaft 2. This ensures that the conveying chamber 211 can simultaneously convey cooling medium to the cooling oil tanks 31 of the two end plates 3 through the two sets of holes. The conveying medium can be conveyed to different positions of each end plate 3 along the shaft 2, so that the cooling medium can uniformly cover different areas of the rotor 1 to improve the uniformity of cooling the rotor 1.

[0033] In some embodiments of this application, an oil inlet 2111 is provided with an oil injection nozzle 22, which forms an oil injection channel 221 extending axially along the rotating shaft 2. The cross-sectional area of ​​the oil injection channel 221 gradually decreases along the direction from the oil inlet 2111 to the conveying chamber 211. Therefore, as the cooling medium enters the conveying chamber 211 from the outside of the rotating shaft 2 through the oil injection nozzle 22, the gradually decreasing cross-sectional area of ​​the oil injection channel 221 effectively increases the pressure of the cooling medium entering the conveying chamber 211. This allows the cooling medium in the conveying chamber 211 to enter the cooling oil tank 31 under greater pressure, thus increasing the flow velocity of the cooling medium and improving the cooling effect on the rotor 1.

[0034] Furthermore, since end plates 3 are provided on both opposite sides of the rotor 1 along the axial direction, in order to ensure that both end plates 3 can receive the cooling medium, conveying holes 212 need to be provided on the shaft 2 at positions corresponding to the end plates 3 on both sides. That is, the conveying holes 212 corresponding to the end plates 3 on both sides are arranged along the axial direction of the shaft 2. Therefore, by providing the oil nozzle 22, it can be ensured that the cooling medium is conveyed to the conveying hole 212 which is farther away from the oil nozzle 22, so as to ensure a stable supply of cooling medium on the end plate 3 which is farther away from the oil nozzle 22.

[0035] In some embodiments of this application, the rotor 1 includes an iron core 11 and a permanent magnet 12. A mounting groove for accommodating the permanent magnet 12 is formed on the axial end face of the iron core 11. The projection of the mounting groove onto a reference plane is spaced apart from the projection of the cooling oil groove 31 onto the reference plane, and the reference plane is perpendicular to the axial direction of the rotating shaft 2. That is, the permanent magnet 12 is embedded into the iron core 11 through the mounting groove, which is offset from the cooling oil groove 31 on the end plate 3 on the same side. This prevents the cooling medium in the cooling oil groove 31 from entering the mounting groove, thereby avoiding problems such as aging and abnormal noise caused by the cooling medium seeping into the mounting groove, and thus improving the reliability of the motor 100.

[0036] In some embodiments of this application, the cooling oil tank 31 includes a first oil tank 311 and a plurality of second oil tanks 312. The plurality of second oil tanks 312 are arranged at intervals along the circumference of the rotating shaft 2. The first oil tank 311 is annular and extends along the circumference of the rotating shaft 2 and is connected to the conveying oil passage 21. The plurality of second oil tanks 312 are located on the outer periphery of the first oil tank 311 and are connected to the first oil tank 311. That is, the plurality of second oil tanks 312 can be connected through the first oil tank 311. By setting the first oil tank 311 and the plurality of second oil tanks 312, the coverage area of ​​the cooling oil tank 31 on the axial end face of the rotor 1 can be increased, thereby increasing the contact area between the rotor 1 and the cooling medium. In addition, during the rotation of the rotating shaft 2, the cooling medium deflects to a certain extent relative to the radial direction of the rotating shaft 2, so that the cooling medium can flow along the first oil tank 311, thereby increasing the residence time of the cooling medium in the cooling oil tank 31. This allows the cooling medium to fully contact the rotor 1 and absorb the heat of the rotor 1, thereby improving the cooling effect on the rotor 1.

[0037] In some embodiments of this application, the second oil groove 312 has an oil drain hole 33 on its bottom wall facing the rotor 1, and the second oil groove 312 communicates with the outside of the end plate 3 through the oil drain hole 33. It should be noted that the outside of the end plate 3 here refers to the space located on the outer periphery of the end plate 3 and the space on the side of the end plate 3 away from the rotor 1. That is to say, the cooling medium in the second oil groove 312 can be discharged from the end plate 3 through the oil drain hole 33 under the action of centrifugal force, etc., and the cooling medium discharged through the oil drain hole 33 can flow to the stator located on the outer periphery of the rotor 1 under the action of centrifugal force, etc., to cool the stator. By providing an oil drain hole 33 on the bottom wall of the second oil tank 312, the cooling medium in the first oil tank 311 must enter the second oil tank 312 before it can be discharged from the end plate 3. That is, the cooling medium in the first oil tank 311 cannot be directly discharged from the end plate 3. This avoids the cooling medium being discharged from the end plate 3 while flowing along the first oil tank 311, thereby increasing the turbulence of the cooling medium in the first oil tank 311 and increasing the residence time of the cooling medium in the cooling oil tank 31, which is beneficial for heat dissipation of the rotor 1.

[0038] In some embodiments of this application, the second oil tank 312 includes a connecting section 3121 and two branch sections 3122. The branch sections 3122 are located on the side of the connecting section 3121 away from the first oil tank 311 and are connected to the first oil tank 311 through the connecting section 3121. The connecting section 3121 extends radially along the rotating shaft 2. The branch sections 3122 are inclined relative to the connecting section 3121. Along the direction from the central axis of the rotor 1 to the outer peripheral surface of the rotor 1, the two branch sections 3122 extend inclinedly in a direction away from each other. Therefore, through the two branch sections 3122, on the one hand, the two branch sections 3122 can respectively adapt to the different deflection directions of the cooling medium when the shaft 2 rotates forward and reverse. That is, when rotating forward, the cooling medium in the connecting section 3121 deflects towards one of the branch sections 3122 and is thrown out through the corresponding oil drain hole 33. When rotating in reverse, the cooling medium in the connecting section 3121 deflects towards the other branch section 3122 and is thrown out through the corresponding oil drain hole 33. This ensures that the cooling medium in the cooling oil tank 31 can be thrown out through the corresponding branch sections 3122 when the shaft 2 rotates forward and reverse, that is, it can better meet the oil throwing requirements when the shaft 2 rotates forward and reverse.

[0039] In some embodiments of this application, the cooling oil tank 31 further includes a plurality of third oil tanks 313. The plurality of third oil tanks 313 are evenly spaced along the circumference of the rotating shaft 2 on the inner circumferential side of the first oil tank 311. The third oil tanks 313 extend radially along the rotating shaft 2. One end of the third oil tank 313 is connected to the first oil tank 311, and the other end of the third oil tank 313 extends to the inner circumferential surface of the mounting hole 32 to form an oil inlet 3131. The oil inlet 3131 is connected to the conveying oil passage 21. In other words, the first oil groove 311 and the inner circumferential surface of the mounting hole 32 are spaced apart. The first oil groove 311 is connected to the conveying oil passage 21 through multiple third oil grooves 313. Since the multiple third oil grooves 313 are evenly spaced along the circumference of the rotating shaft 2, the conveying oil passage 21 can evenly convey the cooling medium to multiple positions along the circumference of the rotating shaft 2 through the multiple third oil grooves 313. This ensures the uniform distribution of the cooling medium in the first oil groove 311, thereby improving the uniformity of cooling different areas of the rotor 1.

[0040] In some embodiments of this application, the number of third oil grooves 313 and second oil grooves 312 are the same and correspond one-to-one. Along the radial direction of the rotating shaft 2, the connecting sections 3121 of the third oil grooves 313 and their corresponding second oil grooves 312 are arranged opposite each other. That is, the third oil grooves 313 and their corresponding second oil grooves 312 are located on opposite sides of the first oil groove 311 along the radial direction of the rotating shaft 2, and the third oil grooves 313 and their corresponding second oil grooves 312 are connected through the first oil groove 311. Therefore, when the rotating shaft 2 rotates, the cooling medium in the third oil groove 313 enters the first oil groove 311 under the action of centrifugal force, etc. A portion of this medium can directly enter the connecting section 3121 to cool the portion of the rotor 1 opposite to the second oil groove 312, while another portion can flow along the first oil groove 311 after deflection, cooling the portion of the rotor 1 opposite to the first oil groove 311. In other words, this ensures that both the first oil groove 311 and the second oil groove 312 have flowing cooling medium, thereby improving the overall cooling effect on the rotor 1.

[0041] In some embodiments of this application, the width of the connecting section 3121 along the circumferential direction of the rotating shaft 2 is greater than the width of the third oil tank 313. Therefore, the connecting section 3121 can provide a larger flow area for the cooling medium, meaning it can carry a larger flow rate of cooling medium, thereby effectively preventing blockage of the cooling medium in the cooling oil tank 31 and ensuring smooth flow of the cooling medium.

[0042] In some embodiments of this application, the oil drain hole 33 extends obliquely in a direction away from the rotor 1, away from the central axis of the rotating shaft 2. One end of the oil drain hole 33, away from the cooling oil groove 31, extends to the side of the end plate 3 facing away from the rotor 1. By obliquely setting the oil drain hole 33, the cooling medium in the second oil groove 312 can be discharged more smoothly through the oil drain hole 33 under the action of centrifugal force. By setting the end of the oil drain hole 33 away from the cooling oil groove 31 on the side of the end plate 3 facing away from the rotor 1, the distance between the cooling medium thrown out through the oil drain hole 33 and the center of the stator along the axial direction of the rotating shaft 2 can be increased. This allows the cooling medium in the oil drain hole 33 to be thrown towards both ends of the stator along the axial direction of the rotating shaft 2, thereby cooling the ends of the stator windings and preventing the cooling medium from entering the space between the rotor 1 and the stator and remaining there. That is, during the flow of the cooling medium within the motor 100, both the rotor 1 and the stator can be cooled, and the cooling medium can be prevented from penetrating between the rotor 1 and the stator and affecting the performance of the motor 100.

[0043] In some embodiments of this application, a plurality of second oil grooves 312 are arranged at uniform intervals along the circumference of the rotating shaft 2. Thus, the cooling medium in the plurality of second oil grooves 312 can uniformly cool different positions of the rotor 1 along the axial direction of the rotating shaft 2, thereby improving the cooling effect on the rotor 1.

[0044] In some embodiments of this application, the two end plates 3 are respectively the first end plate and the second end plate. Along the circumference of the rotating shaft 2, the projection of a single second oil groove 312 on the reference plane of the first end plate is the first projection, and the projection of a single second oil groove 312 on the reference plane of the second end plate is the second projection. Multiple first projections and multiple second projections are arranged alternately along the circumference of the rotating shaft 2. That is, the multiple second oil grooves 312 on the first end plate and the multiple second oil grooves 312 on the second end plate are staggered. Thus, the second oil grooves 312 on both sides can cover different positions of the rotor 1 to cool different positions of the rotor 1. For example, four second oil grooves 312 are provided on one side of the end plate 3, and a total of eight second oil grooves 312 on both end plates 3 can cover eight different areas of the rotor 1. In other words, through the cooperation of the second oil grooves 312 on both sides, while ensuring the cooling effect on the rotor 1, the number of second oil grooves 312 on a single end plate 3 can be reduced, thereby reducing the slotted area of ​​the cooling oil grooves 31 to improve the structural strength of the end plate 3 and improve the reliability of the motor 100.

[0045] The vehicle according to a second aspect of this application is described below with reference to the accompanying drawings.

[0046] The vehicle according to a second aspect of this application includes: the motor 100 described in the first aspect of this application.

[0047] According to the vehicle of the second aspect embodiment of this application, the pre-positioning of the end plate 3 on the rotating shaft 2 can be achieved by the cooperation of the rotation limiting protrusion 321 and the rotation limiting groove, thereby improving the installation position accuracy of the end plate 3. In addition, the positioning between the cooling oil tank 31 and the conveying oil circuit 21 can be completed simultaneously, thereby simplifying the installation process of the end plate 3 and reducing the assembly difficulty of the motor 100 to improve the assembly efficiency.

[0048] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0049] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0050] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

[0051] In this application, "multiple" refers to two or more.

[0052] In this application, unless otherwise expressly defined, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0053] The terms “first,” “second,” “third,” “fourth,” etc., in this application (if present) are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0054] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0055] Unless otherwise specified, all steps in this application may be performed sequentially or randomly. For example, if a method includes steps A and B, it means that the method may include steps A and B performed sequentially, or it may include steps B and A performed sequentially. For example, if a method may also include step C, it means that step C may be added to the method in any order. For example, the method may include steps A, B, and C, or it may include steps A, C, and B, or it may include steps C, A, and B, etc.

[0056] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An electric motor, characterized in that, include: A stator and a rotor, the stator surrounding the outer periphery of the rotor; A rotating shaft passes through the rotor and forms an oil conveying passage; End plates are provided on opposite sides of the rotor along the axial direction. Cooling oil grooves are formed on the side of the end plates facing the rotor and are connected to the conveying oil passage. The end plate has a mounting hole, the rotating shaft passes through the mounting hole, one of the inner circumferential surface of the mounting hole and the outer circumferential surface of the rotating shaft forms a limited rotation protrusion, and the other of the inner circumferential surface of the mounting hole and the outer circumferential surface of the rotating shaft forms a limited rotation groove. The limited rotation protrusion is located in the limited rotation groove to restrict the rotation of the end plate relative to the rotating shaft.

2. The motor according to claim 1, characterized in that, Both the rotation-limiting protrusion and the rotation-limiting groove are provided with multiple protrusions arranged circumferentially along the rotation axis.

3. The motor according to claim 1, characterized in that, The oil conveying circuit includes a conveying cavity and a conveying hole. The conveying cavity is formed inside the rotating shaft and has an oil inlet located on one end face of the rotating shaft. The conveying hole penetrates the outer peripheral wall of the conveying cavity. The inner peripheral surface of the mounting hole forms an oil inlet that communicates with the cooling oil tank. The conveying hole and the oil inlet are arranged opposite each other in a one-to-one correspondence.

4. The motor according to claim 3, characterized in that, The oil inlet is provided with an oil injection nozzle, which forms an oil injection channel extending axially along the rotating shaft. The cross-sectional area of ​​the oil injection channel gradually decreases along the direction from the oil inlet to the delivery chamber.

5. The motor according to claim 1, characterized in that, The rotor includes an iron core and a permanent magnet. An installation groove for accommodating the permanent magnet is formed on the axial end face of the iron core. The projection of the installation groove on the reference plane is spaced apart from the projection of the cooling oil groove on the reference plane. The reference plane is perpendicular to the axial direction of the rotating shaft.

6. The motor according to claim 1, characterized in that, The cooling oil tank includes a first oil tank and a plurality of second oil tanks. The plurality of second oil tanks are arranged at intervals along the circumference of the rotating shaft. The first oil tank is annular and extends along the circumference of the rotating shaft and is connected to the conveying oil passage. The plurality of second oil tanks are located on the outer periphery of the first oil tank and are connected to the first oil tank.

7. The motor according to claim 6, characterized in that, The second oil tank has an oil drain hole on its bottom wall facing the rotor, and the second oil tank is connected to the outside of the end plate through the oil drain hole.

8. The motor according to claim 7, characterized in that, The second oil tank includes a connecting section and two branch sections. The branch sections are located on the side of the connecting section away from the first oil tank and are connected to the first oil tank through the connecting section. The connecting section extends radially along the rotating shaft. The branch sections are inclined relative to the connecting section. Along the direction from the central axis of the rotor to the outer circumferential surface of the rotor, the two branch sections extend inclinedly in a direction away from each other. The oil drain hole is located at the end of the branch section away from the connecting section.

9. The motor according to claim 8, characterized in that, The cooling oil tank also includes a plurality of third oil tanks, which are evenly spaced along the circumference of the rotating shaft on the inner circumferential side of the first oil tank. The third oil tanks extend radially along the rotating shaft. One end of the third oil tank is connected to the first oil tank, and the other end of the third oil tank extends to the inner circumferential surface of the mounting hole to form an oil inlet. The oil inlet is connected to the conveying oil passage.

10. The motor according to claim 9, characterized in that, The number of third oil grooves is the same as that of the second oil grooves and they correspond one-to-one. Along the radial direction of the rotating shaft, the connecting sections of the third oil grooves and the corresponding second oil grooves are arranged opposite to each other; and / or, along the circumferential direction of the rotating shaft, the width of the connecting section is greater than the width of the third oil groove.

11. The motor according to claim 7, characterized in that, In a direction away from the rotor, the oil drain hole extends obliquely in a direction away from the central axis of the rotating shaft, and one end of the oil drain hole away from the cooling oil groove extends to the side of the end plate opposite to the rotor.

12. The motor according to claim 6, characterized in that, The plurality of second oil tanks are arranged at uniform intervals along the circumference of the axis of rotation.

13. The motor according to claim 6, characterized in that, The two end plates are a first end plate and a second end plate, respectively. Along the circumference of the axis of rotation, the projection of a single second oil groove of the first end plate onto the reference surface is a first projection, and the projection of a single second oil groove of the second end plate onto the reference surface is a second projection. Multiple first projections and multiple second projections are arranged alternately along the circumference of the axis of rotation.

14. A vehicle, characterized in that, include: The motor according to any one of claims 1-13.

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