Electric machine and vehicle

Abstract

This application discloses an electric motor and a vehicle, belonging to the field of vehicle technology. The electric motor includes a housing and a stator, with the stator installed inside the housing. At least one first oil groove is provided on the outer wall of the stator, extending circumferentially along the stator, with its opening facing the inner wall of the housing. The housing is provided with at least one first oil passage, the inlet end of which is adapted to communicate with an oil reservoir storing cooling oil, and the outlet end of which communicates with at least one first oil groove. By employing the technical solution provided in this application, excessively high motor temperatures can be avoided.

Description

Technical Field

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

[0002] With increasing emphasis on environmental protection and sustainable development, new energy vehicles have gradually become an important part of modern transportation. New energy vehicles typically include one or more motors to provide power for vehicle operation. When the motor is working, it converts electrical energy into mechanical energy and heat energy. Mechanical energy is used to drive the vehicle and represents useful work. Heat energy is wasted work; the continuous accumulation of heat affects the motor's efficiency, thus reducing the vehicle's pure electric driving range. Furthermore, the sustained accumulation of high heat poses a significant challenge to the motor's insulation system, thereby affecting the motor's lifespan.

[0003] In related technologies, when the motor temperature exceeds a certain level, the motor's output capacity is limited, specifically the output torque, thus controlling and protecting the motor's temperature. However, this can easily lead to insufficient power and inability to drive normally during vehicle operation. Summary of the Invention

[0004] In view of this, this application provides an electric motor and a vehicle that can prevent the motor from overheating.

[0005] On one hand, embodiments of this application provide an electric motor, the electric motor including a housing and a stator, the stator being installed inside the housing;

[0006] The outer wall of the stator is provided with at least one first oil groove, the first oil groove extends circumferentially along the stator, and the opening of the first oil groove faces the inner wall of the housing;

[0007] The housing is provided with at least one first oil passage, the oil inlet of the first oil passage is adapted to communicate with an oil reservoir storing cooling oil, and the oil outlet of the first oil passage is communicated with at least one first oil tank.

[0008] Optionally, the outer wall of the stator is provided with a plurality of first oil grooves, and the plurality of first oil grooves are connected sequentially along the circumference of the stator.

[0009] Optionally, the first oil tank includes a first tank wall, which is located near a first end of the housing;

[0010] The first groove wall is provided with at least one first opening, which extends parallel to the axial direction of the stator from the first groove wall toward the first end of the housing to form a second oil groove.

[0011] Optionally, the first oil tank includes a second tank wall, which is disposed opposite to the first tank wall. The second tank wall is close to the second end of the housing, and the first end of the housing is opposite to the second end of the housing.

[0012] The second groove wall is provided with at least one second opening, which extends parallel to the axial direction of the stator from the second groove wall toward the second end of the housing to form a third oil groove.

[0013] Optionally, the first opening and the second opening are arranged opposite each other in the axial direction of the stator.

[0014] Optionally, the first opening and the second opening are staggered one-to-one along the axial direction of the stator.

[0015] Optionally, the motor further includes a shaft and a rotor;

[0016] The rotor is sleeved on the rotating shaft, the rotor is located inside the stator, and the rotating shaft, the rotor and the stator are coaxial;

[0017] The rotating shaft has a hollow structure, and the inner wall of the rotating shaft is provided with a plurality of first oil holes. The first oil holes extend radially to the outer wall of the rotating shaft to form a second oil passage.

[0018] The cooling oil flows from inside the shaft through the second oil passage to the outside of the shaft.

[0019] Optionally, the motor further includes at least one oil ring, which is sleeved on at least one end of the stator;

[0020] One end face of the oil ring abuts against the end face of the stator, and a portion of the outer wall of the other end of the oil ring abuts against the inner wall of the housing. The outer wall of the oil ring that does not abut against the inner wall of the housing, a portion of the end face of the stator, and the inner wall of the housing form an annular cavity.

[0021] The inner wall of the oil ring is provided with a plurality of second oil holes, which extend radially to the outer wall of the oil ring to form a third oil passage;

[0022] The annular cavity is connected to the second oil tank and the third oil passage respectively; and / or, the annular cavity is connected to the third oil tank and the third oil passage respectively.

[0023] Optionally, the motor further includes at least one first sealing ring and at least one second sealing ring;

[0024] The first end face of the first sealing ring abuts against the end face of the oil ring near the stator, the second end face of the first sealing ring abuts against the end face of the stator near the oil ring, and the first end face and the second end face are opposite to each other;

[0025] The inner wall of the second sealing ring abuts against the outer wall of the oil ring, which is a portion away from the stator, and the outer wall of the second sealing ring abuts against the inner wall of the housing.

[0026] On the other hand, embodiments of this application also provide a vehicle, the vehicle including the motor described in any of the above claims.

[0027] The motor provided in this embodiment includes a housing and a stator. The housing is fitted onto the stator, and the stator does not rotate when the motor is in operation. The outer wall of the stator has at least one first oil groove extending circumferentially along the stator, with its opening facing the inner wall of the housing. The housing has at least one first oil passage, the inlet of which is adapted to communicate with an oil reservoir, and the outlet of which communicates with at least one of the first oil grooves. The oil reservoir is adapted to store cooling oil. With this arrangement, cooling oil can flow from the oil reservoir to the first oil passage, and then into the first oil groove. Since the first oil groove extends circumferentially along the stator, the cooling oil in the first oil groove can diffuse circumferentially along the stator, thereby carrying away some heat from the stator and dissipating heat in a timely manner, reducing the stator's temperature. In other words, it can cool the stator in a timely manner, reducing the motor's temperature and preventing it from overheating, thus ensuring the motor maintains normal operating conditions. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of an electric motor provided in an embodiment of this application;

[0030] Figure 2 This is a cross-sectional schematic diagram of an electric motor provided in an embodiment of this application;

[0031] Figure 3 This is a partial cross-sectional schematic diagram of an electric motor provided in an embodiment of this application.

[0032] Figure label:

[0033] 100. Housing; 110. First oil passage;

[0034] 200, Stator; 210, First oil groove; 211, First groove wall; 212, Second groove wall; 2111, First opening; 2121, Second opening; 220, Second oil groove; 230, Third oil groove; 240, Main body; 250, Protrusion; 260, Fourth oil groove;

[0035] 300, Rotating shaft; 310, First oil hole; 320, Second oil passage;

[0036] 400, Rotor; 410, Third oil hole; 420, Fourth oil passage;

[0037] 510, Second oil hole; 520, Third oil passage; 530, First oil ring; 540, Second oil ring;

[0038] 600. Annular cavity;

[0039] 700. First sealing ring;

[0040] 800, Second sealing ring.

[0041] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0042] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0043] Unless otherwise defined, all technical terms used in the embodiments of this application have the same meaning as commonly understood by those skilled in the art.

[0044] To make the technical solutions and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0045] Combination Figures 1 to 3 As shown, this application embodiment provides an electric motor, which includes a housing 100 and a stator 200, with the stator 200 installed inside the housing 100.

[0046] The outer wall of the stator 200 is provided with at least one first oil groove 210, which extends circumferentially along the stator 200 and has an opening facing the inner wall of the housing 100. The housing 100 is provided with at least one first oil passage 110, the oil inlet of which is adapted to communicate with an oil reservoir storing cooling oil, and the oil outlet of which is communicated with at least one first oil groove 210.

[0047] It should be noted that, with the above configuration, cooling oil can flow from the oil reservoir to the first oil passage 110, and then into the first oil trough 210. Since the first oil trough 210 extends circumferentially along the stator 200, the cooling oil in the first oil trough 210 can diffuse circumferentially along the stator 200, thereby carrying away some heat from the stator 200 and dissipating heat from the stator 200 in a timely manner, thus reducing the temperature of the stator 200. In other words, the stator 200 can be cooled in a timely manner, reducing the temperature of the motor and preventing the motor from overheating, thereby ensuring that the motor maintains normal operating conditions.

[0048] The following is in conjunction with the appendix Figures 1 to 3 The components and functions of the motor provided in the embodiments of this application will be described in more detail.

[0049] like Figure 1 As shown, in some embodiments, the outer wall of the stator 200 is provided with a plurality of first oil grooves 210, which are sequentially connected along the circumference of the stator 200. With this arrangement, when cooling oil flows from the first oil passage 110 into any one of the first oil grooves 210, the cooling oil can flow sequentially along the circumference to the other first oil grooves 210, thereby cooling the circumferential outer wall of the stator 200, reducing the temperature of the stator 200, preventing the motor temperature from becoming too high, and ensuring that the motor can maintain normal operating conditions.

[0050] In some embodiments, a plurality of first oil grooves 210 are arranged spirally along the circumferential direction of the outer wall of the stator 200 and are sequentially connected. It should be noted that since the plurality of first oil grooves 210 arranged spirally along the circumferential direction of the outer wall of the stator 200 are also distributed along the axial direction of the stator 200, the cooling oil can flow not only along the circumferential direction of the stator 200, but also along the axial direction of the stator 200, thereby accelerating the cooling speed of the stator 200, that is, improving the cooling efficiency of the motor.

[0051] In other embodiments, a plurality of first oil grooves 210 are arranged circumferentially along the outer wall of the stator 200 and are sequentially connected. This arrangement allows cooling oil to flow sequentially from one first oil groove 210 into adjacent first oil grooves 210 along the circumference, thereby reducing the temperature of the stator 200 in a timely manner, preventing the motor temperature from becoming too high, and ensuring that the motor can maintain normal operating conditions.

[0052] It should be noted that the multiple first oil tanks 210 are connected in sequence, which can be achieved by the end faces of the multiple first oil tanks 210 abutting each other in sequence, or by the end faces of the multiple first oil tanks 210 being opposite each other and having a preset interval. Figure 1 The diagram shows a plurality of first oil grooves 210 arranged circumferentially along the outer wall of the stator 200, with their end faces facing each other and having a preset interval.

[0053] like Figure 1 As shown, in some embodiments, when the end faces of the plurality of first oil grooves 210 are opposite each other and have a preset interval, the outer wall of the stator 200 is provided with a fourth oil groove 260 at the preset interval. The fourth oil groove 260 extends along the axial direction of the stator 200 from the first end to the second end of the stator 200. The side wall of the fourth oil groove 260 communicates with the side wall of the first oil grooves 210, so that the cooling oil in the first oil grooves 210 can flow into the fourth oil groove 260 and then flow along the axial direction of the stator 200. With this arrangement, the cooling oil can cool the outer wall of the stator 200 along the fourth oil groove 260, thereby achieving a better cooling effect on the motor.

[0054] like Figure 1 As shown, in some embodiments, the first oil groove 210 includes a first groove wall 211, which is close to the first end of the housing 100. The first groove wall 211 has at least one first opening 2111, which extends parallel to the axial direction of the stator 200 from the first groove wall 211 toward the first end of the housing 100, forming a second oil groove 220. With this configuration, the cooling oil flowing into the first oil groove 210 can also flow into the second oil groove 220 through the first opening 2111. Since the second oil groove 220 extends along the axial direction of the stator 200, the cooling oil can be distributed more quickly on the axial outer wall of the stator 200 and flow toward the first end of the housing 100 to cool the axial outer wall of the stator 200, thereby further improving the cooling speed of the stator 200, that is, accelerating the cooling speed of the motor and preventing the motor from failing to work properly due to overheating.

[0055] like Figure 1As shown, in some embodiments, the first oil groove 210 includes a second groove wall 212, which is disposed opposite to the first groove wall 211. The second groove wall 212 is close to the second end of the housing 100, and the first end of the housing 100 is opposite to the second end of the housing 100. The second groove wall 212 is provided with at least one second opening 2121, which extends parallel to the axial direction of the stator 200 from the second groove wall 212 toward the second end of the housing 100 to form a third oil groove 230. With this configuration, the cooling oil flowing into the first oil tank 210 can also flow into the third oil tank 230 through the second opening 2121. Since the third oil tank 230 extends along the axial direction of the stator 200, the cooling oil can be distributed more quickly on the axial outer wall of the stator 200 and flow towards the second end of the housing 100 to cool the axial outer wall of the stator 200. This further improves the cooling speed of the stator 200, which in turn speeds up the cooling speed of the motor and prevents the motor from failing to work properly due to overheating.

[0056] like Figure 1 As shown, in some embodiments, the first opening 2111 and the second opening 2121 are arranged opposite to each other in the axial direction of the stator 200. Thus, the cooling oil in the first oil tank 210 can flow into the second oil tank 220 and the third oil tank 230 through the first opening 2111 and the second opening 2121 respectively, so as to accelerate the cooling speed of the stator 200, that is, improve the cooling speed of the motor.

[0057] In some embodiments, the first opening 2111 and the second opening 2121 are staggered in the axial direction of the stator 200. It should be noted that, because the first opening 2111 and the second opening 2121 are staggered, a portion of the cooling oil can flow from the first oil tank 210 into the second oil tank 220 through the first opening 2111, while another portion of the cooling oil flows circumferentially a certain distance before flowing into the third oil tank 230 through the second opening 2121. This increases the length of the cooling oil flow path, allowing for sufficient cooling of the outer wall of the stator 200 and achieving a better cooling effect.

[0058] Combination Figure 1 and Figure 2As shown, in some embodiments, the motor further includes a shaft 300 and a rotor 400. The rotor 400 is sleeved on the shaft 300 and is located inside the stator 200. The shaft 300, rotor 400, and stator 200 are coaxial. The shaft 300 has a hollow structure, and its inner wall is provided with a plurality of first oil holes 310. The first oil holes 310 extend radially along the shaft 300 to the outer wall of the shaft 300, forming a second oil passage 320. Cooling oil flows from inside the shaft 300 through the second oil passage 320 to the outside of the shaft 300. It should be noted that some of the cooling oil in the oil reservoir can be introduced into the interior of the shaft 300 from its end. The cooling oil then flows from the interior of the shaft 300 through the first oil hole 310 into the second oil passage 320, and then flows out of the second oil passage 320 to the outside of the shaft 300, thus cooling the inner walls of both the rotor 400 and the stator 200. Understandably, when the motor is operating, the shaft 300 and the rotor 400 rotate synchronously, allowing the cooling oil to flow out of the second oil passage 320 and be thrown towards the stator 200, thereby cooling the inner wall of the stator 200.

[0059] In some embodiments, the motor further includes a winding (not shown) located between the stator 200 and the rotor 400. It is understood that the cooling oil flowing from the second oil passage 320 can flow sequentially to the rotor 400, the winding, and the stator 200 to cool the inner walls of the rotor 400, the winding, and the stator 200 respectively, thereby improving the cooling effect and cooling speed of the motor.

[0060] like Figure 2 As shown, in some embodiments, the rotor 400 is sleeved on a portion of the outer wall of the shaft 300, and the first oil hole 310 is located on the portion of the shaft 300 that does not contact the rotor 400. With this arrangement, the cooling oil ejected from the second oil passage 320 can directly contact the windings and the inner wall of the stator 200, thereby accelerating the cooling speed of the inner wall of the stator 200 and also cooling the windings, thus accelerating the cooling speed and effectiveness of the motor.

[0061] like Figure 2 As shown, in some embodiments, the inner wall of the rotor 400 is provided with a plurality of third oil holes 410. The third oil holes 410 extend radially along the rotor 400 to the outer wall of the rotor 400, forming a fourth oil passage 420, which is connected to the second oil passage 320. Thus, the cooling oil ejected from the second oil passage 320 can not only flow along the gap between the rotor 400 and the shaft 300 to cool the inner wall of the rotor 400, but can also be ejected from the fourth oil passage 420 to the outside of the rotor 400, thereby cooling the outer wall of the rotor 400, the windings, and the stator 200, achieving sufficient cooling of the motor and improving the cooling speed and effect.

[0062] Combination Figures 1 to 3 As shown, in some embodiments, the motor further includes at least one oil ring, which is sleeved on at least one end of the stator 200. One end face of the oil ring abuts against the end face of the stator 200, and a portion of the outer wall of the other end of the oil ring abuts against the inner wall of the housing 100. The outer wall of the oil ring that does not abut against the inner wall of the housing 100, a portion of the end face of the stator 200, and the inner wall of the housing 100 form an annular cavity 600. The inner wall of the oil ring is provided with a plurality of second oil holes 510, which extend radially to the outer wall of the oil ring, forming a third oil passage 520. The annular cavity 600 communicates with the second oil groove 220 and the third oil passage 520, respectively; and / or, the annular cavity 600 communicates with the third oil groove 230 and the third oil passage 520, respectively. It should be noted that the abutment of the outer wall of the other end of the oil ring against the inner wall of the housing 100 refers to the abutment of the outer wall of the other end of the oil ring against the circumferential inner wall of the housing 100. With this configuration, the cooling oil located in the second oil tank 220 and / or the third oil tank 230 can flow into the third oil passage 520 and flow out from the second oil hole 510 to the outer wall of the end of the stator 200, so as to fully cool the end of the stator 200, thereby further improving the cooling speed of the stator 200, that is, improving the cooling speed of the motor.

[0063] like Figure 3 As shown, in some embodiments, the stator 200 includes a body portion 240 and a protrusion 250. One end of the protrusion 250 is connected to the body portion 240, and the other end of the protrusion 250 extends in a direction away from the body portion 240. An oil ring is fitted onto the outer wall of at least one end of the body portion 240. The end face of one end of the oil ring abuts against a portion of the end face of the protrusion 250, and a portion of the outer wall of the other end of the oil ring abuts against the inner wall of the housing 100. The outer wall of the oil ring that does not abut against the inner wall of the housing 100, the end face of the protrusion 250 pointing from the outer wall of the oil ring to the inner wall of the housing 100, and the inner wall of the housing 100 form an annular cavity 600. It is understood that the cooling oil flowing out from the third oil passage 520 can sufficiently cool the outer walls of both ends of the body portion 240, thereby improving the cooling effect and cooling speed of the stator 200.

[0064] Combination Figures 1 to 3As shown, in some embodiments, the motor includes a first oil ring 530, which is sleeved on the outer wall of the body portion 240 near the first end of the housing 100. The end face of the first oil ring 530 away from the first end of the housing 100 abuts against the end face of the protrusion 250 near the first end of the housing 100, and a portion of the outer wall of the first oil ring 530 near the first end of the housing 100 abuts against the inner wall of the housing 100. The outer wall of the first oil ring 530 that does not abut against the inner wall of the housing 100 is recessed in a direction away from the inner wall of the housing 100. The outer wall of the first oil ring 530 that does not abut against the inner wall of the housing 100, the end face of the protrusion 250 pointing from the outer wall of the first oil ring 530 to the inner wall of the housing 100, and the inner wall of the housing 100 form an annular cavity 600.

[0065] Combination Figures 1 to 3 As shown, in some embodiments, the motor further includes a second oil ring 540, which is sleeved on the outer wall of the body portion 240 near the second end of the housing 100. The end face of the second oil ring 540 away from the second end of the housing 100 abuts against the end face of the protrusion 250 near the second end of the housing 100, and a portion of the outer wall of the second oil ring 540 near the second end of the housing 100 abuts against the inner wall of the housing 100. The outer wall of the second oil ring 540 that does not abut against the inner wall of the housing 100 is recessed in a direction away from the inner wall of the housing 100. The outer wall of the second oil ring 540 that does not abut against the inner wall of the housing 100, the end face of the protrusion 250 pointing from the outer wall of the second oil ring 540 to the inner wall of the housing 100, and the inner wall of the housing 100 form an annular cavity 600.

[0066] Combination Figure 2 and Figure 3 As shown, in some embodiments, the motor further includes at least one first sealing ring 700 and at least one second sealing ring 800. The first end face of the first sealing ring 700 abuts against the end face of the oil ring near the stator 200, and the second end face of the first sealing ring 700 abuts against the end face of the stator 200 near the oil ring; the first end face and the second end face are opposite to each other. The inner wall of the second sealing ring 800 abuts against a portion of the outer wall of the oil ring away from the stator 200, and the outer wall of the second sealing ring 800 abuts against the inner wall of the housing 100. By providing the first sealing ring 700 and the second sealing ring 800, the sealing performance between the housing 100, the stator 200, and the contact surface of the oil ring can be improved, thereby ensuring that the cooling oil in the annular cavity 600 can flow out from the second oil hole 510 to the end of the stator 200, thereby improving the cooling speed and cooling effect of the stator 200.

[0067] Combination Figure 2 and Figure 3As shown, in some embodiments, the first end face of the first sealing ring 700 abuts against the end face of the first oil ring 530 near the protrusion 250, and the second end face of the first sealing ring 700 abuts against the end face of the protrusion 250 near the first oil ring 530, with the first end face and the second end face facing away from each other. The inner wall of the second sealing ring 800 abuts against a portion of the outer wall of the first oil ring 530 away from the protrusion 250, and the outer wall of the second sealing ring 800 abuts against the inner wall of the first end of the housing 100. Thus, the first sealing ring 700, the second sealing ring 800, the protrusion 250, and the housing 100 can form an annular cavity 600 with a high sealing between the contact surfaces.

[0068] Combination Figure 2 and Figure 3 As shown, in some embodiments, the first end face of the first sealing ring 700 abuts against the end face of the second oil ring 540 near the protrusion 250, and the second end face of the second sealing ring 800 abuts against the end face of the protrusion 250 near the second oil ring 540, with the first end face and the second end face facing away from each other. The inner wall of the second sealing ring 800 abuts against a portion of the outer wall of the second oil ring 540 away from the protrusion 250, and the outer wall of the second sealing ring 800 abuts against the inner wall of the second end of the housing 100. Thus, the first sealing ring 700, the second sealing ring 800, the protrusion 250, and the housing 100 can form an annular cavity 600 with a high sealing between the contact surfaces.

[0069] By providing matching first sealing rings 700 and second sealing rings 800 on both sides of the stator 200, the sealing performance between the contact surfaces of the first sealing ring 700, second sealing ring 800, stator 200, housing 100, first oil ring 530, and second oil ring 540 can be improved. This ensures that cooling oil can flow out from the second oil hole 510 through the third oil passage 520 to cool both ends of the stator 200. This improves the cooling speed and effect of the stator 200, preventing the motor from malfunctioning due to overheating.

[0070] Taking a 200KW motor with a stator diameter of 220mm as an example, the number of first oil grooves 210 and second oil grooves 220 can be 60 to 80, and the width of the first oil groove 210 and the width of the second oil groove 220 can be 3mm to 4mm respectively. The diameter of the opening at the end of the shaft can be 4mm to 6mm. The diameter of the second oil hole 510 can be 3mm to 4mm. The flow rate of cooling oil from the first oil passage 110 to the stator 200 can be 9L / min to 11L / min. The flow rate of cooling oil flowing into the end of the shaft 300 can be 2L / min to 3L / min. Since the flow rate of cooling oil flowing into the stator 200 is generally less than the flow rate of cooling oil flowing into the end of the shaft 300, it can avoid increasing the drag torque of the rotor 400 and reducing the overall efficiency of the motor, and can also achieve sufficient cooling for the stator 200, which is the main heat source of the motor. The dimensions of each oil hole, oil groove, or cooling oil flow rate can be determined based on flow field simulation and motor temperature field simulation for different motors, and then verified by fabricating a physical prototype. For example, multiple thermocouples can be arranged on the windings, and the modified electric drive system assembly can be run on a test bench to detect the temperature rise of each thermocouple at different speeds and torques, in order to support the final design of each oil ring, oil circuit, oil groove, and other components, and to match the appropriate cooling oil flow rate.

[0071] The motor provided in this application embodiment, by setting different oil tanks or oil passages to allow cooling oil to flow in, cools the inner wall of the stator 200, the outer wall of the stator 200, and different areas of the stator 200 in the axial direction, thereby achieving sufficient and rapid cooling of the stator 200. This not only improves the cooling efficiency of the motor but also enhances the cooling effect, ensuring that the motor can be sufficiently cooled to avoid the motor failing to work due to overheating.

[0072] On the other hand, this application also provides a vehicle that includes the motor described in any of the embodiments of this application. It should be noted that the motor in this application has the same components and functions as the motor provided in the embodiments of this application, so these will not be repeated here. Because this motor can cool the stator 200 in a timely manner, reducing the motor temperature and preventing it from overheating, it ensures that the motor maintains normal operating conditions, thereby providing power to the vehicle and ensuring its normal operation.

[0073] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only.

[0074] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. An electric machine characterized in that, The motor includes a housing, a stator, and at least one oil ring. The stator is installed inside the housing, and the oil ring is sleeved on at least one end of the stator. The outer wall of the stator is provided with at least one first oil groove, the first oil groove extends circumferentially along the stator, the opening of the first oil groove faces the inner wall of the housing, and the first oil groove includes a first groove wall and a second groove wall that are disposed opposite to each other and close to opposite ends of the housing. The first groove wall is provided with a first opening, and the second groove wall is provided with a second opening. The first opening and the second opening extend in opposite directions along an axis parallel to the stator, and respectively form a second oil groove and a third oil groove. The housing is provided with at least one first oil passage, the oil inlet of the first oil passage is adapted to communicate with an oil reservoir storing cooling oil, and the oil outlet of the first oil passage is communicated with at least one first oil tank. One end face of the oil ring abuts against the end face of the stator, and a portion of the outer wall of the other end of the oil ring abuts against the inner wall of the housing. The outer wall of the oil ring that does not abut against the inner wall of the housing, the end face of the stator located between the oil ring and the housing, and the inner wall of the housing form an annular cavity. The inner wall of the oil ring is provided with a plurality of second oil holes, which extend radially along the oil ring to the outer wall of the oil ring to form a third oil passage. The annular cavity is connected to the second oil groove and the third oil passage respectively; and / or, the annular cavity is connected to the third oil groove and the third oil passage respectively.

2. The electric machine of claim 1, wherein, The stator has a plurality of first oil grooves on its outer wall, and the plurality of first oil grooves are connected sequentially along the circumference of the stator.

3. The electric machine of claim 1, wherein, The first opening and the second opening are arranged opposite each other in the axial direction of the stator.

4. The motor according to claim 1, characterized in that, The first opening and the second opening are staggered one-to-one along the axial direction of the stator.

5. The electric machine of claim 1, wherein, The motor also includes a shaft and a rotor; The rotor is sleeved on the rotating shaft, the rotor is located inside the stator, and the rotating shaft, the rotor and the stator are coaxial; The rotating shaft has a hollow structure, and the inner wall of the rotating shaft is provided with a plurality of first oil holes. The first oil holes extend radially to the outer wall of the rotating shaft to form a second oil passage. The cooling oil flows from inside the shaft through the second oil passage to the outside of the shaft.

6. The electric machine of claim 1, wherein, The motor further includes at least one first sealing ring and at least one second sealing ring; The first end face of the first sealing ring abuts against the end face of the oil ring near the stator, the second end face of the first sealing ring abuts against the end face of the stator near the oil ring, and the first end face and the second end face are opposite to each other; The inner wall of the second sealing ring abuts against the outer wall of the oil ring, which is a portion away from the stator, and the outer wall of the second sealing ring abuts against the inner wall of the housing.

7. A vehicle characterized by comprising: The vehicle includes an electric motor as described in any one of claims 1 to 6.

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