Drive electric motor for electric vehicle, powertrain and electric vehicle

Abstract

A drive electric motor (100) for an electric vehicle, a powertrain (10) and an electric vehicle (1). An end cover (110) of a housing of the drive electric motor comprises a mounting groove (111) and two side surfaces, wherein one side surface (110a) faces a rotor (130b) of the drive electric motor, and the other side surface (110b) faces away from the rotor of the drive electric motor. The groove bottom or groove wall of the mounting groove comprises an opening (114a). One side surface comprises a bearing recess (140), and the other side surface is configured to fix a cover plate (150), which is configured to enclose the other side surface to form an accommodating cavity (160). The recess bottom (140a) of the bearing recess comprises a through hole (113), which is configured to communicate the bearing recess with the accommodating cavity. The other side surface comprises another opening (114b), which is exposed to the accommodating cavity and is configured to communicate with the former opening through an internal channel (115) of the end cover, such that oil and gas entering the accommodating cavity are discharged from the other opening via the internal channel of the end cover and the former opening, thereby extending a condensation path of the oil and gas.

Description

Drive motor, power assembly and electric vehicle for electric vehicle

[0001] The present application claims priority to the Chinese patent application No. 202411358129.X filed on September 27, 2024, and entitled "Drive motor, power assembly and electric vehicle for electric vehicle", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of power assembly, in particular to a drive motor, a power assembly and an electric vehicle for electric vehicle. BACKGROUND

[0003] The power assembly usually includes a motor, a motor controller and a reducer. In the new energy vehicle industry, the power assembly is the power source of the whole vehicle and plays an important role in the driving process of the electric vehicle. When the motor is in working state, a large amount of heat is generated inside the motor, causing the internal gas to expand due to heating. Therefore, a breather valve needs to be provided in the motor to ensure the balance of internal and external air pressure. At the same time, in order to avoid the internal temperature of the motor being too high, cooling oil needs to be introduced to cool and dissipate heat of the heating device. However, the cooling oil will evaporate into oil mist at high temperature. Due to the short oil mist condensation path in the current motor, the oil mist is prone to accumulate in the breather valve, causing the breather valve to be unable to ventilate. When the breather valve accumulates a large amount of oil mist, it may also cause leakage of the cooling oil, thereby reducing the utilization rate of the cooling oil and weakening the heat dissipation effect. SUMMARY

[0004] The present application provides a drive motor, a power assembly and an electric vehicle for electric vehicle.

[0005] In a first aspect, the present application provides a drive motor for electric vehicle. The housing of the drive motor includes an end cover and a sleeve. The sleeve is used to fix a stator of the drive motor and accommodate a rotor of the drive motor. The end cover includes an installation slot and two side surfaces. One of the two side surfaces faces the rotor of the drive motor, and the other of the two side surfaces faces away from the rotor of the drive motor. The installation slot is used to fix and accommodate a breather valve. The bottom or wall of the installation slot includes an opening. The one side surface includes a bearing groove used to fix an outer ring of a bearing. The inner ring of the bearing is used to drive connect one end of a motor shaft of the drive motor. The other side surface is used to fix a cover plate. The cover plate is used to enclose at least part of the other side surface to form an accommodation cavity. The bottom of the bearing groove includes a through hole used to communicate the bearing groove and the accommodation cavity. The other side surface includes another opening exposed to the accommodation cavity. The other opening is used to communicate the opening through an internal passage of the end cover. The axis of the opening intersects the axis of the installation slot.

[0006] In the embodiment of the present application, the other one of the two sides is away from the rotor of the driving motor, the bottom of the bearing groove comprises a through hole for connecting the bearing groove and the accommodating cavity, and the other side comprises another opening, so that the opening direction of the other opening along the driving motor is away from the stator of the driving motor, thereby avoiding that the gaseous cooling oil formed by evaporation of the cooling oil in the sleeve at high temperature of the driving motor directly enters the other opening from the bearing groove through the through hole, and the oil gas condensation path is extended. The other opening is exposed to the accommodating cavity, so that the high-pressure gas in the sleeve can be discharged into the accommodating cavity through the through hole, and then into the other opening through the accommodating cavity.

[0007] In the embodiment of the present application, the other opening is used to connect the one opening through the internal passage of the end cover, so that the oil gas from the sleeve can enter the other opening and then pass through the internal passage of the end cover, the one opening and the mounting groove in sequence to be discharged from the driving motor, so that the gaseous cooling oil has a longer flow path in the end cover under the condition that the oil gas discharge ensures the air pressure balance between the inside and outside of the driving motor, and the gaseous cooling oil condensation path is further extended, thereby facilitating the condensation of the gaseous cooling oil.

[0008] In the embodiment of the present application, the axis of the one opening intersects the axis of the mounting groove, so that the path of the internal passage connected with the one opening is longer, and the gaseous cooling oil condensation path is further extended. In addition, under the condition that the axial dimension of the cover plate is small, the gaseous cooling oil condensation path in the oil gas can be extended by intersecting the axis of the one opening with the axis of the mounting groove, thereby facilitating the condensation of the gaseous cooling oil, and further recycling and utilizing the cooling oil to improve the utilization efficiency of the cooling oil. Or by intersecting the axis of the one opening with the axis of the mounting groove, the axial dimension of the end cover can be reduced under the condition that the other cooling oil condensation path is extended, thereby reducing the axial dimension of the driving motor.

[0009] In the driving motor provided by the embodiment of the present application, the through hole connects the bearing groove and the accommodating cavity, and the other opening connects the accommodating cavity and the one opening through the internal passage of the end cover, so that the oil gas in the sleeve passes through the bearing groove, the through hole, the accommodating cavity, the other opening, the internal passage of the end cover and the one opening in sequence to be discharged, the gaseous cooling oil condensation path in the oil gas is extended, and the condensation of the gaseous cooling oil is facilitated. The axis of the one opening intersects the axis of the mounting groove, so that the internal passage between the one opening and the other opening is extended, and the end cover can further extend the oil gas condensation path under the condition that the axial dimension is small.

[0010] In one embodiment, the one opening is arranged between the axis of the one mounting groove and the stator of the driving motor along the axial direction of the driving motor.

[0011] In the embodiment of the present application, one opening is arranged between the axis of the mounting groove and the stator of the driving motor in the axial direction of the driving motor, so that the opening is conveniently machined from the mounting groove, and the machining process is simplified. The opening is inclined to be close to the stator of the driving motor, and the internal passage of the end cover is arranged in an inclined manner, so that the condensation path of the oil gas is prolonged, and the gaseous cooling oil is condensed.

[0012] In one embodiment, the end cover further comprises a first protrusion, the first protrusion protrudes from the end cover away from the stator of the driving motor, and the mounting groove is formed in the first protrusion.

[0013] In the embodiment of the present application, the first protrusion protrudes from the end cover away from the stator of the driving motor, and the mounting groove is formed in the first protrusion, so that the axis of the opening in the mounting groove can be inclined from the side away from the stator to the stator, the length of the internal passage connected with the opening is prolonged, and the opening can be inclined at a larger angle when the end cover is thin, the condensation path of the oil gas is prolonged, and the gaseous cooling oil is condensed. The first protrusion protrudes from the end cover away from the stator of the driving motor, so that the first protrusion of the end cover has sufficient thickness to form the mounting groove without affecting the strength of the end cover. The mounting groove is formed in the first protrusion, so that the axial length of other parts of the end cover can be smaller, thereby reducing the weight of the end cover.

[0014] In one embodiment, along the radial direction of the driving motor, the distance between the other opening and the axis of the driving motor is greater than half the inner diameter of the bearing groove.

[0015] In the embodiment of the present application, since the bearing groove occupies the axial part of the end cover corresponding to the bearing groove, the other opening needs to avoid the position of the bearing groove, and the distance between the other opening and the axis of the driving motor is greater than half the inner diameter of the bearing groove, so that the internal passage path connected with the other opening can be longer, thereby prolonging the condensation path of the oil gas, and the gaseous cooling oil is condensed.

[0016] In one embodiment, the internal passage of the end cover comprises a first passage, the first passage extends from the other opening to the stator of the driving motor in the axial direction of the driving motor, and the first passage is used to connect the opening.

[0017] In the embodiment of the present application, the first passage extends from the other opening to the stator of the driving motor in the axial direction of the driving motor, so that the opening can be connected to the first passage in the direction of being inclined to the side of the stator of the driving motor, thereby facilitating the prolongation of the condensation path of the oil gas between the opening and the other opening, and the gaseous cooling oil is condensed. The gas in the accommodating cavity enters the first passage from the other opening, and then is discharged from the driving motor through the opening, the mounting groove and the air vent valve.

[0018] In an embodiment, the inner wall of the first channel comprises a communication port for communicating the first channel and an opening. Wherein the distance between the opening and the slot of the bearing groove along the axial direction of the driving motor is greater than the distance between the communication port and the slot of the bearing groove.

[0019] In the embodiment, the inner wall of the first channel comprises a communication port for communicating the first channel and an opening. Wherein the distance between the opening and the slot of the bearing groove along the axial direction of the driving motor is greater than the distance between the communication port and the slot of the bearing groove.

[0020] In the embodiment, the opening and the communication port are communicated through the internal passage of the end cover. The distance between the opening and the slot of the bearing groove along the axial direction of the driving motor is greater than the distance between the communication port and the slot of the bearing groove. This can make the part of the internal passage between the opening and the communication port in the end cover inclined towards the stator, increase the length of the part of the internal passage between the opening and the communication port, and facilitate the condensation of the gaseous cooling oil when flowing through the opening, the communication port and the part of the internal passage between the opening and the communication port. In addition, the condensed cooling oil can flow back to the other opening along the inclined part of the internal passage of the end cover, and then flow back to the position of the through hole, thereby avoiding the leakage of the cooling oil. In addition, the distance between the opening and the slot of the bearing groove along the axial direction of the driving motor is greater than the distance between the communication port and the slot of the bearing groove, so that the opening is away from the side surface compared with the communication port, facilitating the machining of the opening and the communication port.

[0021] In an embodiment, the mounting groove and the other opening are spaced apart along the circumferential direction of the driving motor. The distance between the mounting groove and the axis of the through hole along the radial direction of the driving motor is greater than the distance between the other opening and the axis of the through hole.

[0022] In the embodiment, the mounting groove and the other opening are spaced apart along the circumferential direction of the driving motor. This makes the internal passage between the other opening and the opening of the mounting groove not only have axial and radial components, but also have a circumferential component, thereby prolonging the condensation path of the oil gas between the other opening and the opening, and facilitating the condensation of the gaseous cooling oil.

[0023] In the embodiment of the present application, the distance between the mounting groove along the radial direction of the driving motor and the axis of the through hole is greater than the distance between the other opening and the axis of the through hole. After the gaseous cooling oil enters the other opening, the distance between the mounting groove and the axis of the through hole is greater, so that the gaseous cooling oil has a longer distance from the other opening to the mounting groove, so that the gaseous cooling oil can be better condensed. The distance between the mounting groove along the radial direction of the driving motor and the axis of the through hole is greater than the distance between the other opening and the axis of the through hole, and the distance between the other opening and the axis of the through hole is smaller, so that the oil gas from the through hole can quickly enter the other opening, accelerate the discharge of the high-pressure gas in the sleeve, and help the pressure balance inside and outside the driving motor.

[0024] In an embodiment, the diameter of the other opening is greater than the diameter of the one opening, and the diameter of the one opening is less than half the inner diameter of the one mounting groove.

[0025] In the embodiment of the present application, the diameter of the other opening is greater than the diameter of the one opening, and the diameter of the other opening is greater, so that the oil gas in the accommodating cavity can enter the other opening faster and more, and then enter the one opening, which is conducive to the discharge of the oil gas in the sleeve, and helps to maintain the pressure balance of the driving motor sleeve. The diameter of the one opening is smaller, which is conducive to the gaseous cooling oil not being able to quickly discharge the opening, so that the gaseous cooling oil contacts the inner wall of the internal passage in a smaller space, so that the gaseous cooling oil is better condensed in the internal passage of the end cover between the one opening and the other opening.

[0026] In the embodiment of the present application, the diameter of the one opening is less than half the inner diameter of the one mounting groove. Since the oil gas can be condensed between the two openings, the diameter of the one opening is smaller, which can make the gaseous cooling oil better condensed in the internal passage of the end cover, and on the other hand, it also makes the opening be able to communicate from the groove wall or groove bottom of the mounting groove to the internal passage of the end cover, avoiding that the diameter of the one opening is too large to penetrate the groove wall or groove bottom of the mounting groove and cannot be communicated to the internal passage of the end cover.

[0027] In an embodiment, the other side further comprises a plurality of fixing holes, and the plurality of fixing holes are arranged around the one through hole along the circumferential direction of the driving motor. The plurality of fixing holes are used for fixing a cover plate. Wherein, along the radial direction of the driving motor, the distance between at least part of the fixing holes and the one through hole is greater than the distance between the other opening and the one through hole.

[0028] In the embodiment of the present application, the plurality of fixing holes are used for fixing the cover plate, and the plurality of fixing holes are arranged around the through hole along the circumferential direction of the driving motor, which is conducive to making the cover plate more firmly fixed, and also conducive to making the accommodating cavity enclosed by the cover plate and the end cover isolated from the outside, avoiding the gaseous cooling oil leaking from the accommodating cavity.

[0029] In the embodiments of the present application, the distance between the at least partially fixed hole and the through hole is greater than the distance between the other opening and the through hole along the radial direction of the driving motor, so that the other opening can be exposed in the accommodating cavity, and the high-pressure gas discharged from the sleeve into the accommodating cavity can enter the other opening and then flow through the communication port, the second channel, and the one opening and the mounting groove in turn. If the distance between the at least partially fixed hole and the through hole is less than the distance between the other opening and the through hole, the other opening needs to be arranged away from the fixed hole, which makes the other opening farther away from the through hole, and in order to ensure that the internal channel of the end cover is long enough to provide the gaseous cooling oil for condensation, the overall height of the entire flow path needs to be moved along the axis direction of the mounting groove. However, by setting the distance between the at least partially fixed hole and the through hole to be greater than the distance between the other opening and the through hole, the other opening can be arranged at a lower position along the axis direction of the mounting groove, which is beneficial to the entire path of the gaseous cooling oil and the high-pressure gas without occupying the space outside the axis direction of the mounting groove, thereby avoiding the increase of the driving motor along the axis direction of the mounting groove, and facilitating the miniaturization of the driving motor and the power assembly.

[0030] In an embodiment, the end cover further comprises a recess, the recess is recessed from the end cover towards the stator of the driving motor, the opening of the recess is used to enclose the cover plate to form an accommodating cavity, the other opening is formed in the bottom of the recess, and the through hole penetrates the bottom of the recess.

[0031] In the embodiments of the present application, the recess is recessed from the end cover towards the stator of the driving motor, and the opening of the recess is used to enclose the cover plate to form the accommodating cavity, which can reduce the axial length of the driving motor. The through hole penetrates the bottom of the recess, so that the oil and gas in the sleeve can be discharged through the through hole and enter the other opening. The other opening is formed in the bottom of the recess, so that the distance between the other opening and the through hole is close to the sleeve, and the oil and gas in the sleeve can be quickly discharged from the other opening. In addition, when the cover plate and the end cover are separated, the recess is beneficial to the prying of the cover plate by the tool abutting against the bottom of the recess.

[0032] In an embodiment, the other side further comprises a second protrusion, the second protrusion protrudes away from the stator of the motor, and the second protrusion is exposed in the accommodating cavity. The second protrusion surrounds the through hole and is arranged between the through hole and the other opening along the radial direction of the driving motor. The distance between the second protrusion and the through hole is less than the distance between the second protrusion and the other opening along the radial direction of the driving motor.

[0033] In the embodiment of the present application, the second protrusion is away from the stator protrusion of the driving motor, and the second protrusion surrounds the through hole, so that the second protrusion can strengthen the rigidity of the through hole. The second protrusion is arranged between the through hole and the other opening along the radial direction of the driving motor, so that the gaseous cooling oil coming out of the through hole needs to pass through the second protrusion and contact the second protrusion when entering the other opening, thereby increasing the contact surface area of the gaseous cooling oil and the other side, thereby facilitating the condensation of the gaseous cooling oil. The second protrusion arranged between the through hole and the other opening along the radial direction of the driving motor also facilitates reducing the direct impact of the condensed cooling oil on the motor shaft when being discharged from the other opening, thereby reducing the loss of the motor shaft.

[0034] In the embodiment of the present application, the distance between the second protrusion and the through hole along the radial direction of the driving motor is less than the distance between the second protrusion and the other opening, so that the second protrusion is arranged closer to the through hole, thereby facilitating the rapid condensation of the gaseous cooling oil coming out of the through hole. It is also beneficial to better reinforce the through hole by the second protrusion.

[0035] In an embodiment, the other side further includes two third protrusions, the two third protrusions are away from the stator protrusion of the driving motor, and the two third protrusions are exposed in a receiving cavity. Among them, the two third protrusions are arranged on both sides of the other opening along the circumferential direction of the driving motor. The through hole, the second protrusion and the two third protrusions are arranged in sequence along the radial direction of the driving motor. The length of at least one third protrusion along the radial direction of the driving motor is greater than the distance between the other opening and the second protrusion.

[0036] In the embodiment of the present application, the two third protrusions are away from the stator protrusion of the driving motor, and the two third protrusions are exposed in the receiving cavity, which is beneficial to the gaseous cooling oil in the receiving cavity to have more contact area with the shell of the end cover, which is beneficial to the heat dissipation of the gaseous cooling oil and accelerates the condensation rate of the gaseous cooling oil.

[0037] In the embodiment of the present application, the opening of the other opening reduces the strength of the end cover, and arranging the two third protrusions on both sides of the other opening along the circumferential direction of the driving motor can strengthen the strength of the end cover and increase the reliability of the end cover.

[0038] In the embodiment of the present application, the through hole, the second protrusion and the two third protrusions are arranged in sequence along the radial direction of the driving motor, so that the third protrusion can also strengthen the second protrusion and improve the overall strength of the end cover.

[0039] In the embodiment of the present application, the length of at least one third protrusion along the radial direction of the driving motor is greater than the distance between the other opening and the second protrusion, and the distance between the other opening and the second protrusion is small, which is beneficial to the oil gas discharged from the through hole to pass through the second protrusion and enter the other opening more quickly, thereby accelerating the discharge process of the oil gas.

[0040] In an embodiment, the other side further comprises two fourth protrusions, the two fourth protrusions protrude away from the stator protrusion of the driving motor, and the two fourth protrusions are exposed to the accommodating cavity. The two fourth protrusions are arranged at two ends of the second protrusion along the circumferential direction of the driving motor. Each fourth protrusion is spaced apart from the cover plate along the axial direction of the driving motor, and the spacing distance between each fourth protrusion and the cover plate is smaller than the spacing distance between the second protrusion and the cover plate.

[0041] In the embodiments of the present application, the fourth protrusions are used to support the cover plate, and the two fourth protrusions are arranged at the two ends of the second protrusion along the circumferential direction of the driving motor, so that the two fourth protrusions can be arranged relatively dispersedly, and the cover plate can be better supported by the two fourth protrusions, so that the cover plate cannot be tightly attached to the second protrusion to hinder the oil and gas from entering the other opening through the second protrusion, and the oil and gas in the sleeve can be discharged normally.

[0042] In the embodiments of the present application, the spacing distance between each fourth protrusion and the cover plate along the axial direction of the driving motor is smaller than the spacing distance between the second protrusion and the cover plate, so that even if the driving motor is extruded in the axial direction of the driving motor, the deformation of the cover plate can be spaced apart from the second protrusion by the two fourth protrusions, so that the oil and gas in the sleeve can be discharged normally, and the normal operation of the driving motor is ensured.

[0043] In a second aspect, the present application provides a power assembly, the power assembly comprising a reducer and a driving motor as in the first aspect, and an input shaft of the reducer is drivingly connected to the motor shaft of the driving motor.

[0044] In the driving motor in the embodiments of the present application, the bearing groove and the accommodating cavity are communicated by the through hole, and the accommodating cavity and the other opening are communicated by the internal passage of the end cover, which is conducive to prolonging the condensation path of the oil and gas in the sleeve and condensing the gaseous cooling oil. The axis of the other opening intersects the axis of the mounting groove, so that the path of the internal passage communicated with the other opening is longer, and the condensation path of the gaseous cooling oil is further prolonged. The condensed cooling oil can flow back to the other opening along the inclined internal passage, and then flow back to the position of the through hole, so that the leakage of the cooling oil of the driving motor is avoided, and the reliability of the power assembly is improved.

[0045] In a third aspect, the present application provides an electric vehicle, the electric vehicle comprising a vehicle frame, a power battery, and a power assembly as in the second aspect, the vehicle frame is used to fix the power battery and the power assembly, and the driving motor of the power assembly is used to receive the electric energy provided by the power battery and drive the wheels of the electric vehicle through the reducer of the power assembly.

[0046] The power assembly in the embodiment of the present application comprises a driving motor, the driving motor utilizes a through hole to communicate the bearing groove and the accommodating cavity, another opening hole communicates the accommodating cavity and one opening hole through the internal passage of the end cover, which is conducive to prolonging the condensation path of the oil gas in the sleeve and condensing the gaseous cooling oil. The axis of the opening hole intersects with the axis of the mounting groove, so that the path of the internal passage communicated with the opening hole is longer, thereby prolonging the condensation path of the gaseous cooling oil. In addition, in the case that the axial dimension of the cover plate is small, by intersecting the axis of the opening hole with the axis of the mounting groove, the condensation path of the gaseous cooling oil in the oil gas can be prolonged, thereby facilitating the condensation of the gaseous cooling oil, recycling the cooling oil, improving the utilization efficiency of the cooling oil, improving the reliability of the power assembly, and further improving the overall performance of the vehicle. BRIEF DESCRIPTION OF DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be described below.

[0048] FIG. 1 is a schematic view of an electric vehicle according to an embodiment of the present application;

[0049] FIG. 2 is a schematic view of a power assembly according to an embodiment of the present application;

[0050] FIG. 3 is a schematic view of a driving motor according to an embodiment of the present application;

[0051] FIG. 4 is another schematic view of an end cover of the driving motor according to an embodiment of the present application;

[0052] FIG. 5 is an exploded view of the end cover of the driving motor according to an embodiment of the present application;

[0053] FIG. 6 is a schematic view of the end cover according to an embodiment of the present application;

[0054] FIG. 7 is another schematic view of the end cover according to an embodiment of the present application;

[0055] FIG. 8 is a partial enlarged view of M1 part of the driving motor in FIG. 3;

[0056] FIG. 9 is another schematic view of the end cover according to an embodiment of the present application;

[0057] FIG. 10 is a partial enlarged view of M2 part of the end cover in FIG. 9;

[0058] FIG. 11 is a partial enlarged view of M3 part of the driving motor in FIG. 3;

[0059] FIG. 12 is a partial enlarged view of M4 part of the end cover in FIG. 9. DETAILED DESCRIPTION

[0060] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0061] This application provides a drive motor for an electric vehicle. The drive motor housing includes an end cover and a sleeve. The sleeve is used to fix the stator of the drive motor and accommodate the rotor of the drive motor. The end cover includes a mounting groove and two sides. One side faces the rotor of the drive motor, and the other side faces away from the rotor. The mounting groove is used to fix and accommodate a vent valve. The bottom or wall of the mounting groove includes an opening. One side includes a bearing groove for fixing the outer ring of a bearing. The inner ring of the bearing is used to drively connect one end of the motor shaft of the drive motor. The other side is used to fix a cover plate, which encloses at least a portion of the other side to form a receiving cavity. The bottom of the bearing groove includes a through hole for connecting the bearing groove and the receiving cavity. The other side includes another opening exposed in the receiving cavity. This other opening connects to the first opening through an internal channel of the end cover. The axis of the first opening intersects the axis of the mounting groove.

[0062] In the drive motor provided in this embodiment, a through hole connects the bearing groove and the receiving cavity, and another opening connects the receiving cavity and an opening through the internal channel of the end cap. This allows the oil and gas in the sleeve to exit sequentially through the bearing groove, the through hole, the receiving cavity, the other opening, the internal channel of the end cap, and an opening, thus extending the condensation path of the gaseous cooling oil in the oil and gas, which is beneficial for the condensation of the gaseous cooling oil. The axis of one opening intersects the axis of the mounting groove, which extends the internal channel between the two openings. In addition, it also allows the end cap to extend the condensation path of the oil and gas while maintaining a relatively small axial dimension.

[0063] The drive motor provided in this application embodiment is applied to the powertrain, which is then applied to electric vehicles to improve the overall performance of the electric vehicles.

[0064] Figure 1 is a schematic diagram of an electric vehicle 1 provided in an embodiment of this application. As shown in Figure 1, the electric vehicle 1 includes a powertrain 10, a frame 20, a power battery 30, and wheels 40. The powertrain 10 and the power battery 30 are fixed to the frame 20. The powertrain 10 receives power from the power battery 30 and drives the wheels 40.

[0065] In this embodiment, the power battery 30 may also be referred to as a battery pack. In this embodiment, the electric vehicle 1 refers to a wheeled device driven or towed by a power unit.

[0066] Figure 2 is a schematic diagram of the power assembly 10 according to an embodiment of the present application. As shown in Figure 2, the power assembly 10 comprises a driving motor 100, a speed reducer 200 and a motor controller 300. In one embodiment, the power assembly 10 comprises the driving motor 100 and the speed reducer 200.

[0067] In the embodiment of the present application, the motor controller 300 is configured to receive direct current from the power battery 30 and output alternating current to the driving motor 100. The stator of the driving motor 100 receives the alternating current to drive the shaft of the driving motor 100 to rotate. The driving motor 100 is configured to be drivingly connected to the speed reducer 200. The speed reducer 200 is configured to be drivingly connected to the wheels 40 of the electric vehicle 1.

[0068] In the embodiment of the present application, the shaft of the driving motor 100 is configured to be drivingly connected to the input shaft of the speed reducer 200. The input shaft of the speed reducer 200 is drivingly connected to the output shaft of the speed reducer 200 through a gear assembly. In the embodiment of the present application, the gear assembly comprises a single-gear speed reduction assembly, a two-gear speed reduction assembly or a multi-gear speed reduction assembly.

[0069] The electric energy provided by the motor controller 300 is converted into kinetic energy and transmitted to the input shaft of the speed reducer 200. The input shaft of the speed reducer 200 transmits the power to the internal gears of the speed reducer 200. The output shaft of the speed reducer 200 is configured to transmit the power of the driving motor 100 to the wheels 40.

[0070] Figure 3 is a schematic diagram of the driving motor 100 according to an embodiment of the present application. As shown in Figure 3, the driving motor 100 comprises a stator 130a, a rotor 130b and a motor shaft 130c. The rotor 130b is fixedly sleeved on the motor shaft 130c. The stator 130a is configured to drive the rotor 130b to rotate after receiving alternating current, thereby driving the motor shaft 130c to rotate.

[0071] A large amount of heat is generated during the operation of the driving motor 100. In order to avoid the expansion of the internal gas, a breather valve is needed to balance the internal and external air pressure of the driving motor. In order to avoid the temperature of the stator and the rotor inside the driving motor being too high, cooling oil is needed to be introduced to cool and lower the temperature of the heating devices such as the stator and the rotor. The cooling oil is easy to be converted into oil mist at high temperature. If the oil mist accumulates in the breather valve, not only the breather valve will be blocked, but also the cooling oil may leak out of the breather valve.

[0072] In the end cover of the driving motor, a through hole is formed to communicate the bearing groove and the accommodating cavity. Another opening is formed to communicate the accommodating cavity and one opening through the internal passage of the end cover. The axis of one opening intersects with the axis of the mounting groove. The condensation path of the gaseous cooling oil in the oil gas is extended. In addition, the end cover can extend the condensation path of the oil gas in the case of a smaller axial dimension, so that the condensed cooling oil flows back to the inner cavity of the driving motor.

[0073] The driving motor 100 provided by the embodiments of the present application will be described in detail below.

[0074] FIG. 4 is another schematic view of the end cover 110 of the driving motor 100 provided by the embodiments of the present application, FIG. 5 is an exploded view of the end cover 110 of the driving motor 100 provided by the embodiments of the present application, FIG. 6 is a schematic view of the end cover 110 provided by the embodiments of the present application, and FIG. 7 is another schematic view of the end cover 110 provided by the embodiments of the present application.

[0075] In one embodiment, as shown in FIGS. 3 to 7, a housing of a driving motor 100 for an electric vehicle 1 includes an end cover 110 and a sleeve 120, the sleeve 120 is used to fix a stator 130a of the driving motor 100 and accommodate a rotor 130b of the driving motor 100, the end cover 110 includes a mounting groove 111 and two side surfaces 110a, 110b, one of the two side surfaces 110a faces the rotor 130b of the driving motor 100, and the other of the two side surfaces 110b faces away from the rotor 130b of the driving motor 100. The mounting groove 111 is used to fix and accommodate an air permeable valve 170, and the groove bottom or groove wall of the mounting groove 111 includes an opening 114a. As shown in FIG. 6, the side surface 110a includes a bearing groove 140, the bearing groove 140 is used to fix an outer ring of a bearing (not shown), and an inner ring of the bearing is used to drivingly connect one end of a motor shaft 130c of the driving motor 100. As shown in FIG. 5, the side surface 110b is used to fix a cover plate 150, the cover plate 150 is used to enclose at least part of the side surface 110b to form an accommodation cavity 160. As shown in FIG. 6, the groove bottom 140a of the bearing groove 140 includes a through hole 113, the through hole 113 is used to communicate the bearing groove 140 and the accommodation cavity 160. As shown in FIGS. 5 and 4, the side surface 110b includes another opening 114b, the opening 114b is exposed to the accommodation cavity 160, the opening 114b is used to communicate the opening 114a through an internal passage 115 of the end cover 110, and the axis of the opening 114a intersects the axis Z of the mounting groove 111.

[0076] In the embodiment of the present application, the side 110b of the two sides 110a, 110b faces away from the rotor 130b of the driving motor 100, the groove bottom 140a of the bearing groove 140 comprises a through hole 113 for connecting the bearing groove 140 and the accommodating cavity 160, the side 110b comprises an opening hole 114b, and the opening direction of the opening hole 114b along the driving motor axial O faces away from the stator 130a of the driving motor 100, so that the gaseous cooling oil formed by evaporation of the cooling oil in the sleeve 120 under high temperature of the driving motor 100 can be prevented from directly entering the opening hole 114b from the bearing groove 140 through the through hole 113, and the oil gas condensation path is prolonged.

[0077] In the embodiment of the present application, the opening hole 114b is used to connect the opening hole 114a through the internal passage 115 of the end cover 110, so that the oil gas from the sleeve 120 can enter the opening hole 114b and then pass through the internal passage 115 of the end cover 110, the opening hole 114a and the mounting groove 111 in sequence to be discharged from the driving motor 100, so that the gaseous cooling oil has a longer flow path in the end cover 110 under the condition that the oil gas discharge ensures the air pressure balance between the inside and outside of the driving motor 100, and the gaseous cooling oil condensation path is prolonged, thereby facilitating the condensation of the gaseous cooling oil.

[0078] In the embodiment of the present application, the axis of the opening hole 114a intersects the axis Z of the mounting groove 111, so that the path of the internal passage 115 connected with one opening hole 114 is longer, and the gaseous cooling oil condensation path is prolonged. In addition, under the condition that the axial dimension of the cover plate 150 is small, the gaseous cooling oil condensation path in the oil gas can be prolonged by intersecting the axis of the opening hole 114a with the axis Z of the mounting groove 111, thereby facilitating the condensation of the gaseous cooling oil, recycling the cooling oil and improving the utilization efficiency of the cooling oil. Or by intersecting the axis of the opening hole 114a with the axis Z of the mounting groove 111, the axial dimension of the end cover 110 can be reduced under the condition that the gaseous cooling oil condensation path is prolonged, thereby reducing the axial dimension of the driving motor 100.

[0079] In one embodiment, the distance between the air permeable valve 170 and the through hole 113 is less than or equal to the distance between the outer edge of the end cover 110 and the through hole 113, so that the arrangement of the air permeable valve 170 does not excessively occupy the space of the driving motor 100, and the volume of the driving motor 100 is miniaturized.

[0080] FIG. 8 is a partial enlarged view of the M1 part of the driving motor 100 in FIG. 3.

[0081] In an embodiment, as shown in FIG. 3 and FIG. 8, the hole 114a is arranged along the axial direction O of the driving motor 100 between the axis Z of the mounting groove 111 and the stator 130a of the driving motor 100.

[0082] In the embodiment, the hole 114a is arranged along the axial direction O of the driving motor 100 between the axis Z of the mounting groove 111 and the stator 130a of the driving motor 100, so that the hole 114a is conveniently machined from the mounting groove 111, simplifying the machining process. It is also beneficial to make the hole 114a inclined close to the stator 130a of the driving motor 100, and beneficial to make the internal passage 115 of the end cover 110 inclined, so as to prolong the condensation path of the oil gas, and beneficial to the condensation of the gaseous cooling oil.

[0083] FIG. 9 is another schematic view of the end cover 110 according to the embodiment, and FIG. 10 is a partial enlarged view of the M2 portion of the end cover 110 in FIG. 9.

[0084] In an embodiment, as shown in FIG. 5, FIG. 9 and FIG. 10, the end cover 110 further comprises a first protrusion 118a protruding from the end cover 110 away from the stator 130a of the driving motor 100, and the mounting groove 111 is formed in the first protrusion 118a.

[0085] In the embodiment, the first protrusion 118a protrudes from the end cover 110 away from the stator 130a of the driving motor 100, and the mounting groove 111 is formed in the first protrusion 118a, so that the axis of the hole 114a in the mounting groove 111 can be inclined from the side away from the stator 130a towards the stator 130a, prolonging the length of the internal passage 115 connected by the hole 114a, and also making the hole 114a be able to be inclined at a larger angle when the end cover 110 is thinner, prolonging the oil gas condensation path, and beneficial to the condensation of the gaseous cooling oil. The first protrusion 118a protrudes from the end cover 110 away from the stator 130a of the driving motor 100, so that the first protrusion 118a of the end cover 110 has sufficient thickness to open the mounting groove 111 without affecting the strength of the end cover 110. Forming the mounting groove 111 in the first protrusion 118a makes the axial length of other parts of the end cover 110 smaller, thereby reducing the weight of the end cover 110.

[0086] In an embodiment, as shown in FIG. 3 and FIG. 8, the length of the first protrusion 118a along the axial direction O of the driving motor 100 is greater than half of the inner diameter of the mounting groove 111.

[0087] In the embodiment of the present application, the length of the first protrusion 118a along the axial direction O of the driving motor 100 is greater than half of the inner diameter of the mounting groove 111, so that the inclination angle of the axis of the opening 114a can be larger, which is conducive to prolonging the oil gas flow path. It also makes the first protrusion 118a have enough space to open the mounting groove 111 for accommodating a breather valve 170, and also makes the opening 114a in the mounting groove 111 can be inclined.

[0088] In an embodiment, the distance between the first protrusion 118a and the through hole 113 is greater than the distance between the opening 114b and the through hole 113.

[0089] In the embodiment of the present application, the distance between the first protrusion 118a and the through hole 113 is greater than the distance between the opening 114b and the through hole 113, and the mounting groove 111 is formed in the first protrusion 118a, so that the distance between the mounting groove 111 and the through hole 113 is also greater than the distance between the opening 114b and the through hole 113. The distance between the opening 114b and the through hole 113 is smaller, which facilitates the gaseous cooling oil coming out of the through hole 113 to quickly enter the opening 114b. After the gaseous cooling oil enters the opening 114b, the distance between the mounting groove 111 and the through hole 113 is larger, so that the gaseous cooling oil has a longer distance from the opening 114b to the mounting groove 111, so that the gaseous cooling oil can be condensed by the connecting section, thereby improving the utilization efficiency of the cooling oil.

[0090] Figure 11 is a partial enlarged view of the M3 part of the driving motor 100 in Figure 3.

[0091] In an embodiment, as shown in Figures 3 and 11, along the radial direction R of the driving motor 100, the distance between the opening 114b and the axis of the driving motor 100 is greater than half of the inner diameter of the bearing groove 140.

[0092] In the embodiment of the present application, as shown in Figure 11, the distance between the opening 114b and the axis of the driving motor 100 is denoted as L1, and half of the inner diameter of the bearing groove 140 is denoted as L2. Since the bearing groove 140 occupies the axial part of the part of the end cover 110 corresponding to it, the opening 114b avoids the position of the opening of the bearing groove 140, L1>L2, so that the internal passage 115 path connected with the opening 114b can be longer, thereby the condensation path of the oil gas can be prolonged, which is conducive to the condensation of the gaseous cooling oil.

[0093] In an embodiment, as shown in Figures 3 and 8, the internal passage 115 of the end cover 110 includes a first passage 115b, which extends from the opening 114b to the stator 130a of the driving motor 100 along the axial direction O of the driving motor 100, and the first passage 115b is used to communicate the opening 114a.

[0094] In the embodiment of the present application, the first channel 115b extends from the opening 114b to the stator 130a of the driving motor 100 along the axial direction O of the driving motor 100, so that the opening 114a can communicate with the first channel 115b in a direction inclined to the side of the stator 130a of the driving motor 100, thereby facilitating the extension of the condensation path of the oil gas between the opening 114a and the opening 114b and the condensation of the gaseous cooling oil. The gas in the accommodation cavity 160 enters the first channel 115b from the opening 114b, and then is discharged from the driving motor 100 through the opening 114a, the mounting groove 111 and the air valve 170.

[0095] In an embodiment, the length of the first channel 115b along the axial direction O of the driving motor 100 is greater than the distance between the opening 114b and the groove bottom 140a of the bearing groove 140.

[0096] In the embodiment of the present application, the length of the first channel 115b along the axial direction O of the driving motor 100 is greater than the distance between the opening 114b and the groove bottom 140a of the bearing groove 140, so that the opening 114a can be inclined to the side of the stator 130a and communicate with the first channel 115b through the inclined channel, thereby facilitating the extension of the condensation path of the oil gas and the condensation of the gaseous cooling oil.

[0097] In an embodiment, as shown in FIGS. 3 and 8, the inner wall of the first channel 115b includes a communication port 112 for communicating the first channel 115b and the opening 114a. Wherein, the distance between the opening 114a and the groove opening of the bearing groove 140 along the axial direction O of the driving motor 100 is greater than the distance between the communication port 112 and the groove opening of the bearing groove 140.

[0098] In the embodiment of the present application, the inner wall of the first channel 115b includes a communication port 112 for communicating the first channel 115b and the opening 114a, so that the oil gas in the accommodation cavity 160 can flow through the opening 114b, the first channel 115b, the communication port 112 and the opening 114a in sequence.

[0099] In the embodiment of the present application, as shown in FIG. 3, the distance between the opening 114a and the slot of the bearing groove 140 along the axial direction O of the driving motor 100 is denoted as L3, and the distance between the communication port 112 and the slot of the bearing groove 140 is denoted as L4. The opening 114a and the communication port 112 are communicated through the partial internal passage 115 of the end cover 110. L3>L4, so that the partial internal passage 115 between the opening 114a and the communication port 112 is inclined towards the stator 130a in the end cover 110, the length of the partial internal passage 115 between the opening 114a and the communication port 112 is increased, which is conducive to better condensation of the gaseous cooling oil flowing through the opening 114a, the communication port 112 and the partial internal passage 115 therebetween, and can also avoid that the condensed cooling oil is blocked in the mounting groove 111. The condensed cooling oil can flow back to the opening 114b along the inclined partial internal passage 115 of the end cover 110, and then flow back to the position of the through hole 113, thereby avoiding the leakage of the cooling oil. In addition, L3>L4 makes the opening 114a deviate from the side surface 110a compared with the communication port 112, which facilitates the processing of the opening 114a and the communication port 112.

[0100] In an embodiment, as shown in FIG. 3 and FIG. 8, the internal passage 115 of the end cover 110 further comprises a second passage 115a for communicating the opening 114a and the communication port 112. The length of the second passage 115a is greater than the length of the projection of the second passage 115a along the radial direction R of the driving motor and the length of the projection of the second passage 115a along the axial direction O of the driving motor. The projection length of the second passage 115a along the axial direction O of the driving motor is greater than the projection length of the second passage 115a along the radial direction R of the driving motor.

[0101] In the embodiment of the present application, the second passage 115a is used to communicate the opening 114a and the communication port 112, so that the gas entering the opening 114b can pass through the communication port 112, the second passage 115a and the communication port 112 in turn and be discharged from the mounting groove 111.

[0102] In the embodiment of the present application, the length of the second passage 115a is greater than the length of the projection of the second passage 115a along the radial direction R of the driving motor and the length of the projection of the second passage 115a along the axial direction O of the driving motor. The second passage 115a is an inclined partial internal passage 115, and the length of the second passage 115a is increased, which is conducive to the condensation of the gaseous cooling oil flowing through the second passage 115a and then flowing back to the opening 114b and the through hole 113.

[0103] In the embodiment of the present application, the projection length of the second channel 115a along the axial direction O of the driving motor is greater than the projection length of the second channel 115a along the radial direction R of the driving motor, and the second channel 115a is arranged at a large inclination angle in the end cover 110, thereby facilitating the smooth sliding of the condensed cooling oil along the interior of the second channel 115a to the opening 114b, and facilitating the recovery of the cooling oil. The projection length of the second channel 115a along the axial direction O of the driving motor is greater than the projection length of the second channel 115a along the radial direction R of the driving motor, which also facilitates the second channel 115a having a longer length without excessively increasing the size of the end cover 110, thereby facilitating the condensation of the gaseous cooling oil in the second channel 115a.

[0104] In an embodiment, as shown in FIGS. 9 and 10, the mounting groove 111 is spaced apart from the opening 114b along the circumferential direction C of the driving motor 100, and the distance between the mounting groove 111 and the axis of the through hole 113 along the radial direction R of the driving motor 100 is greater than the distance between the opening 114b and the axis of the through hole 113.

[0105] In the embodiment of the present application, the mounting groove 111 is spaced apart from the opening 114b along the circumferential direction C of the driving motor 100, so that the internal channel 115 between the opening 114b and the opening 114a of the mounting groove 111 has not only an axial path component and a radial path component, but also a circumferential path component, thereby prolonging the condensation path of the oil gas between the opening 114b and the opening 114a, and facilitating the condensation of the gaseous cooling oil.

[0106] In the embodiment of the present application, the distance between the mounting groove 111 and the axis of the through hole 113 is denoted as L5, and the distance between the opening 114b and the axis of the through hole 113 is denoted as L6, L5>L6, after the gaseous cooling oil enters the opening 114b, L5 is greater, so that the gaseous cooling oil has a longer distance from the opening 114b to the mounting groove 111, so that the gaseous cooling oil can be better condensed. L5>L6, L6 is smaller, which facilitates the oil gas coming out of the through hole 113 to quickly enter the opening 114b, speeds up the discharge of the high-pressure gas in the sleeve 120, and facilitates the balance of the internal and external air pressures in the driving motor 100.

[0107] As shown in FIG. 10, in the embodiment of the present application, the axis Z of the mounting groove 111 intersects the radial direction R of the driving motor 100.

[0108] In an embodiment, as shown in FIGS. 4, 5 and 8, the hole diameter of the opening 114b is greater than the hole diameter of the opening 114a, and the hole diameter of the opening 114a is less than half of the inner diameter of one mounting groove 111.

[0109] In the embodiment of the present application, the aperture of the opening 114b is denoted as L7, the aperture of the opening 114a is denoted as L8, L7>L8, L7 is larger, so that the oil and gas in the accommodating cavity 160 can enter the opening 114b faster and more, and then enter the opening 114a, which is beneficial to the discharge of the oil and gas in the sleeve 120, and is beneficial to maintaining the air pressure balance in the sleeve 120 of the driving motor 100, L8 is smaller, which is beneficial to the gaseous cooling oil not being able to be discharged from the opening 114a quickly, and making the gaseous cooling oil contact the inner wall of the internal passage 115 in a smaller space, so that the gaseous cooling oil is better condensed when in the internal passage 115 of the end cover 110 between the opening 114a and the opening 114b.

[0110] In the embodiment of the present application, the aperture of the mounting groove 111 is denoted as L9, L8<0.5L9, because the oil and gas can be condensed between the two openings 114a and 114b, L8 is smaller, which can make the gaseous cooling oil better condensed in the internal passage 115 of the end cover 110, and on the other hand, also makes the opening 114a be able to be communicated to the internal passage 115 of the end cover 110 from the groove wall or groove bottom of the mounting groove 111, avoiding that L8 is too large to penetrate the groove wall or groove bottom of the mounting groove 111 and cannot be communicated to the internal passage 115 of the end cover 110. In an embodiment, when the mounting groove 111 is formed in the first protrusion 118a, if L8 is designed to be too large, the opening 114a will penetrate the outer side of the first protrusion 118a along the radial direction R of the driving motor and cannot be communicated to the internal passage 115 of the end cover 110.

[0111] In an embodiment, as shown in FIGS. 5, 9 and 10, the side surface 110b further comprises a plurality of fixing holes 116, the plurality of fixing holes 116 are arranged around the through hole 113 along the circumferential direction C of the driving motor, and the plurality of fixing holes 116 are used for fixing the cover plate 150. Among them, along the radial direction R of the driving motor, the distance between at least part of the fixing holes 116 and the through hole 113 is greater than the distance between the opening 114b and the through hole 113.

[0112] In the embodiment of the present application, the plurality of fixing holes 116 are used for fixing the cover plate 150, and the plurality of fixing holes 116 are arranged around the through hole 113 along the circumferential direction C of the driving motor, which is beneficial to more firmly fixing the cover plate 150, and is also beneficial to isolating the accommodating cavity 160 formed by the cover plate 150 and the end cover 110 from the outside, avoiding the gaseous cooling oil leaking from the accommodating cavity 160.

[0113] In the embodiment of the present application, as shown in FIG. 10, along the radial direction R of the driving motor, the distance between the at least partially fixed hole 116 and the through hole 113 is recorded as L10, and the distance between the opening hole 114b and the through hole 113 is recorded as L11, L10>L11, so that the opening hole 114b can be exposed in the accommodating cavity 160, so that the high-pressure gas discharged from the sleeve 120 to the accommodating cavity 160 can enter the opening hole 114b, and then flow through the communication port 112, the second channel 115a, and the opening hole 114a and the mounting groove 111 in sequence. If L10L11, the opening hole 114b needs to be arranged to avoid the fixed hole 116, which will make the opening hole 114b far away from the through hole 113, so that in the case of ensuring that the internal channel 115 of the end cover 110 provides a long enough space for the gaseous cooling oil to condense, the entire height of the entire flow path needs to be moved along the axis Z direction of the mounting groove 111, and L10>L11 can make the opening hole 114b be arranged at a lower position along the axis Z direction of the mounting groove 111, which is beneficial to make the entire path of the gaseous cooling oil and the high-pressure gas flow through not occupy the space of the end cover 110 along the axis Z direction of the mounting groove 111, thereby avoiding the increase of the size of the driving motor 100 along the axis Z direction of the mounting groove 111, which is beneficial to the miniaturization of the driving motor 100 and the power assembly 10.

[0114] In an embodiment, the distance between the partially fixed hole 116 and the through hole 113 is smaller than the distance between the opening hole 114b and the through hole 113, so that the distance between the partially fixed hole 116 and the through hole 113 is smaller, so that the part of the side surface 110b that does not form the opening hole 114b does not need to reserve a larger space to form the fixed hole 116, so that the accommodating cavity 160 formed by the cover plate 150 and the side surface 110b is as small as possible under the condition of meeting the exhaust, thereby reducing the volume of the driving motor 100.

[0115] In an embodiment, as shown in FIG. 5, FIG. 9 and FIG. 10, the end cover 110 further comprises a groove 117, the groove 117 is recessed from the end cover 110 towards the stator 130a of the driving motor 100, the groove 117 is used to enclose the cover plate 150 to form the accommodating cavity 160, the opening hole 114b is formed in the groove bottom 117a of the groove 117, and the through hole 113 penetrates the groove bottom 117a of the groove 117.

[0116] In the embodiment of the present application, the recess 117 is recessed from the end cover 110 towards the stator 130a of the drive motor 100, and the slot of the recess 117 is used to enclose the cover plate 150 to form the accommodating cavity 160. The recess 117 is used to enclose the cover plate 150 to form the accommodating cavity 160, which can reduce the axial length O of the drive motor. The through hole 113 penetrates the slot bottom 117a of the recess 117, so that the oil gas in the sleeve 120 can be discharged through the through hole 113 and enter the opening 114b. The opening 114b is formed in the slot bottom 117a of the recess 117, so that the opening 114b and the through hole 113 are close to the sleeve 120, so that the oil gas in the sleeve 120 can be quickly discharged from the opening 114b. In addition, when the cover plate 150 and the end cover 110 are separated, the recess 117 is beneficial to the abutment of the tool to the slot bottom of the recess 117 to pry open the cover plate 150.

[0117] In an embodiment, as shown in FIGS. 3 and 5, the depth of the recess 117 along the axial direction O of the drive motor is less than the slot width of the mounting groove 111.

[0118] In the embodiment of the present application, the recess 117 is used to enclose the cover plate 150 to form the accommodating cavity 160, which can reduce the axial length O of the drive motor. If the axial slot depth of the recess 117 is too large, the end cover 110 will not have axial space to form the axial first channel 115b. Therefore, the depth of the recess 117 is less than the slot width of the mounting groove 111 located in the end cover 110.

[0119] In an embodiment, as shown in FIGS. 4, 5 and 10, the side surface 110b further comprises a second protrusion 118b, the second protrusion 118b protrudes away from the stator 130a of the drive motor 100, and the second protrusion 118b is exposed in the accommodating cavity 160. The second protrusion 118b surrounds the through hole 113, and the second protrusion 118b is arranged between the through hole 113 and the opening 114b along the radial direction R of the drive motor. The distance between the second protrusion 118b and the through hole 113 along the radial direction R of the drive motor 100 is less than the distance between the second protrusion 118b and the opening 114b.

[0120] In the embodiment of the present application, the second protrusion 118b protrudes away from the stator 130a of the drive motor 100, and the second protrusion 118b surrounds the through hole 113, so that the second protrusion 118b can strengthen the rigidity of the through hole 113. The second protrusion 118b is arranged between the through hole 113 and the opening 114b along the radial direction R of the drive motor, so that the gaseous cooling oil coming out of the through hole 113 needs to pass through the second protrusion 118b and contact the second protrusion 118b when entering the opening 114b. This increases the contact surface area of the gaseous cooling oil with the side surface 110b, thereby facilitating the condensation of the gaseous cooling oil.

[0121] In the embodiment of the present application, as shown in FIG. 10, the distance between the second protrusion 118b and the through hole 113 along the radial direction R of the driving motor 100 is smaller than the distance between the second protrusion 118b and the opening 114b, so that the second protrusion 118b is arranged closer to the through hole 113, which is conducive to the rapid condensation of the gaseous cooling oil coming out of the through hole 113. It is also conducive to the better reinforcement of the through hole 113 by the second protrusion 118b.

[0122] In an embodiment, the opening 114b and the through hole 113 are formed in the groove 117, so that the opening 114b and the through hole 113 are close to the sleeve 120, so that the oil gas in the sleeve 120 can be quickly discharged from the opening 114b, and in order to prolong the cooling path of the gaseous cooling oil, the second protrusion 118b is formed at the bottom of the groove 117, so that the gas can be quickly discharged and the cooling path of the gaseous cooling oil can be prolonged, avoiding the blockage and loss of the cooling oil.

[0123] In an embodiment, when the side surface 110b is not provided with the groove 117, in order to form the accommodating cavity 160, the cover plate 150 can be designed as a groove structure, and the groove structure of the cover plate 150 is recessed away from the end cover 110, so that the cover plate 150 and the side surface 110b form the accommodating cavity 160. The second protrusion 118b can be formed on the planar portion of the side surface 110b.

[0124] In an embodiment, as shown in FIG. 10, the length of the second protrusion 118b accounts for more than or equal to one third and less than or equal to one half of the circumference of the through hole 113. In this way, the second protrusion 118b can stably reinforce the through hole 113 while using less material, which is conducive to weight reduction.

[0125] FIG. 12 is a partial enlarged view of the M4 portion of the end cover 110 in FIG. 9.

[0126] In an embodiment, as shown in FIGS. 4, 5 and 12, the side surface 110b further comprises two third protrusions 118c, which protrude away from the stator 130a of the driving motor 100 and are exposed in the accommodating cavity 160. The two third protrusions 118c are arranged on both sides of the opening 114b along the circumferential direction C of the driving motor 100. The through hole 113, the second protrusion 118b and the two third protrusions 118c are arranged in sequence along the radial direction R of the driving motor 100.

[0127] In the embodiment of the present application, the two third protrusions 118c protrude away from the stator 130a of the driving motor 100 and are exposed in the accommodating cavity 160, which is conducive to the gaseous cooling oil having more contact area with the end cover 110 when the gaseous cooling oil is in the accommodating cavity 160, which is conducive to the heat dissipation of the gaseous cooling oil and accelerates the condensation rate of the gaseous cooling oil.

[0128] In the embodiment of the present application, the opening of the opening hole 114b reduces the strength of the end cover 110, and the two third protrusions 118c arranged on both sides of the opening hole 114b along the motor circumferential direction C can strengthen the strength of the end cover 110 and increase the reliability of the end cover 110.

[0129] In the embodiment of the present application, the through hole 113, the second protrusion 118b and the two third protrusions 118c are arranged in sequence along the motor radial direction R, so that the third protrusion 118c can also strengthen the second protrusion 118b and improve the overall strength of the end cover 110.

[0130] In one embodiment, the length of the at least one third protrusion 118c along the motor radial direction R is greater than the distance between the opening hole 114b and the second protrusion 118b.

[0131] In the embodiment of the present application, the length of the at least one third protrusion 118c along the motor radial direction R is denoted as L12, and the distance between the opening hole 114b and the second protrusion 118b is denoted as L13, L12>L13, and L13 is small, which is beneficial to the oil and gas discharged from the through hole 113 to pass through the second protrusion 118b into the opening hole 114b more quickly, thereby accelerating the oil and gas discharge process.

[0132] In one embodiment, as shown in FIGS. 4, 5 and 10, the side surface 110b further includes two fourth protrusions 118d protruding away from the stator 130a of the driving motor 100 and exposed in the accommodating cavity 160. Among them, the two fourth protrusions 118d are arranged at both ends of the second protrusion 118b along the motor circumferential direction C. The distance between each fourth protrusion 118d and the cover plate 150 along the motor axial direction O is less than the distance between the second protrusion 118b and the cover plate 150.

[0133] In the embodiment of the present application, the fourth protrusion 118d is used to support the cover plate 150, and the two fourth protrusions 118d are arranged at both ends of the second protrusion 118b along the motor circumferential direction C, so as to facilitate the relatively dispersed arrangement of the two fourth protrusions 118d, so that the two fourth protrusions 118d can better support the cover plate 150, thereby avoiding the cover plate 150 being close to the second protrusion 118b to hinder the oil and gas passing through the second protrusion 118b into the opening hole 114b, and avoiding the oil and gas in the sleeve 120 cannot be discharged.

[0134] In the embodiment of the present application, the distance between each fourth protrusion 118d and the cover plate 150 along the drive motor axial direction O is less than the distance between the second protrusion 118b and the cover plate 150, so that even if the drive motor 100 is subjected to extrusion along the drive motor axial direction O, the deformation of the cover plate 150 can be spaced by the two fourth protrusions 118d, so that the oil gas in the sleeve 120 can be normally discharged, and the normal operation of the drive motor 100 is ensured.

[0135] The driving motor for electric vehicles, the power assembly and the electric vehicle provided by the embodiments of the present application are described in detail above, and the principles and embodiments of the present application are described by applying specific examples. The above embodiment description is only used to help understand the method and core idea of the present application. Meanwhile, for those skilled in the art, according to the idea of the present application, the specific embodiments and application range will be changed, and the above description should not be understood as a limitation of the present application.

Claims

1. A drive motor for an electric vehicle, characterized by, The housing of the drive motor comprises an end cover and a sleeve for fixing the stator of the drive motor and accommodating the rotor of the drive motor, the end cover comprises a mounting slot and two sides, one of the two sides faces the rotor of the drive motor, the other of the two sides faces away from the rotor of the drive motor, wherein: The one mounting slot is used for fixing and accommodating a breather valve, the bottom or wall of the one mounting slot comprises an opening; The one side comprises a bearing groove for fixing the outer ring of a bearing, the inner ring of the bearing is used for driving connection with one end of the motor shaft of the drive motor; The other side is used for fixing a cover plate, the cover plate is used for enclosing at least part of the other side to form an accommodating cavity; The bottom of the one bearing groove comprises a through hole for communicating the one bearing groove and the one accommodating cavity, the other side comprises another opening exposed to the one accommodating cavity, the other opening is used for communicating the one opening through the internal passage of the one end cover, the axis of the one opening intersects the axis of the one mounting slot.

2. The drive motor of claim 1, wherein Along the axial direction of the drive motor, the one opening is arranged between the axis of the one mounting slot and the stator of the drive motor.

3. The drive motor according to claim 1 or 2, characterized in that The one end cover further comprises a first protrusion protruding away from the stator of the drive motor, and the one mounting slot is formed in the first protrusion.

4. Drive motor according to any of claims 1-3, characterized in that Along the radial direction of the drive motor, the distance between the other opening and the axis of the drive motor is greater than half the inner diameter of the one bearing groove.

5. Drive motor according to any of claims 1-4, characterized in that The internal passage of the one end cover comprises a first passage extending from the other opening to the stator of the drive motor along the axial direction of the drive motor, and the first passage is used for communicating the one opening.

6. The drive motor of claim 5, wherein, The inner wall of the one first passage comprises a communication port for communicating the one first passage and the one opening, wherein: Along the axial direction of the drive motor, the distance between the one opening and the slot opening of the one bearing groove is greater than the distance between the one communication port and the slot opening of the one bearing groove.

7. Drive motor according to any of claims 1-6, characterized in that The one mounting slot and the other opening are spaced along the circumferential direction of the drive motor, and along the radial direction of the drive motor, the distance between the one mounting slot and the axis of the one through hole is greater than the distance between the other opening and the axis of the one through hole.

8. Drive motor according to any of claims 1-7, characterized in that The diameter of the other opening is greater than the diameter of the one opening, and the diameter of the one opening is less than half the inner diameter of the one mounting slot.

9. Drive motor according to any of claims 1-8, characterized in that The other side further comprises a plurality of fixing holes arranged around the one through hole along the circumferential direction of the drive motor, and the fixing holes are used for fixing the one cover plate, wherein: Along the radial direction of the drive motor, the distance between at least part of the fixing holes and the one through hole is greater than the distance between the other opening and the one through hole.

10. Drive motor according to any of claims 1-9, characterized in that The one end cover further comprises a recess, the recess is recessed from the one end cover towards the stator of the driving motor, an opening of the recess is used to enclose the one cover plate to form the one accommodating cavity, the other opening is formed at a bottom of the recess, and the one through hole penetrates through the bottom of the recess.

11. Drive motor according to any of claims 1-10, characterized in that The other side further comprises a second protrusion, the second protrusion is protruded away from the stator of the driving motor, and the second protrusion is exposed in the one accommodating cavity, wherein: The second protrusion is arranged around the one through hole, and the second protrusion is arranged between the one through hole and the other opening along the radial direction of the driving motor. The distance between the second protrusion and the one through hole along the radial direction of the driving motor is smaller than the distance between the second protrusion and the other opening.

12. The drive motor of claim 11, wherein, The other side further comprises two third protrusions, the two third protrusions are protruded away from the stator of the driving motor, and the two third protrusions are exposed in the one accommodating cavity, wherein: The two third protrusions are arranged on two sides of the other opening along the circumferential direction of the driving motor. The one through hole, the second protrusion and the two third protrusions are arranged in sequence along the radial direction of the driving motor.

13. The drive motor of claim 11, wherein, The other side further comprises two fourth protrusions, the two fourth protrusions are protruded away from the stator of the driving motor, and the two fourth protrusions are exposed in the one accommodating cavity, wherein: The two fourth protrusions are arranged at two ends of the second protrusion along the circumferential direction of the driving motor. The distance between each fourth protrusion and the one cover plate along the axial direction of the driving motor is smaller than the distance between the second protrusion and the one cover plate.

14. A powertrain, characterized by, The power assembly comprises a reducer and a driving motor according to any one of claims 1-13, and an input shaft of the reducer is drivingly connected to the motor shaft of the driving motor.

15. An electric vehicle characterized by comprising: The electric vehicle comprises a frame, a power battery and a power assembly according to claim 14, the frame is used to fix the power battery and the power assembly, and the driving motor of the power assembly is used to receive the electric energy provided by the power battery and drive the wheels of the electric vehicle through the reducer of the power assembly.

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