Driving motor for electric vehicle, power assembly and electric vehicle

Abstract

The embodiment of the invention provides a driving motor for an electric vehicle, a power assembly and the electric vehicle, an end cover of a shell of the driving motor comprises a mounting groove and two side faces, one side face faces a rotor of the driving motor, and the other side face deviates from the rotor of the driving motor. The groove bottom or the groove wall of the installation groove comprises an open hole. One side face comprises a bearing groove, the other side face is used for fixing a cover plate, and the cover plate is used for enclosing the other side face to form a containing cavity. A through hole is formed in the groove bottom of the bearing groove and used for communicating the bearing groove with the containing cavity, so that oil gas on one side of the bearing groove flows into the containing cavity through the through hole. The other side surface comprises another open hole, the other open hole is exposed out of the accommodating cavity and is used for being communicated with one open hole through an internal channel of the end cover, and the axis of one open hole is intersected with the axis of the mounting groove, so that oil gas entering the accommodating cavity passes through the internal channel of the end cover from the other open hole and is arrayed through one open hole with an inclined axis; and an oil-gas condensation path is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of powertrain, and in particular to a drive motor for an electric vehicle, a powertrain and an electric vehicle. Background Art

[0002] The powertrain usually includes a motor, a motor controller, and a reducer. In the new energy vehicle industry, the powertrain is the power source of the entire vehicle and plays an important role in the driving process of electric vehicles. When the motor is in operation, a lot of heat will be generated inside the motor, causing the internal gas to expand due to the heat. Therefore, a breather valve needs to be installed in the motor to ensure the balance of internal and external air pressure. At the same time, in order to avoid excessive internal temperature of the motor, cooling oil needs to be introduced to cool the heating components. The cooling oil will evaporate into oil mist at high temperatures. Since the condensation path of the oil mist in the current motor is short, the oil mist is easily accumulated in the breather valve, making the breather valve unable to ventilate. When there is a lot of oil mist accumulated in the breather valve, 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 of the invention

[0003] The present application provides a drive motor, a powertrain and an electric vehicle for an electric vehicle.

[0004] In a first aspect, the present application provides a driving motor for an electric vehicle, wherein the housing of the driving motor includes an end cover and a sleeve, wherein the sleeve is used to fix the stator of the driving motor and to accommodate the rotor of the driving motor, and wherein the end cover includes a mounting groove and two side surfaces, wherein one of the two side surfaces faces the rotor of the driving motor, and the other of the two side surfaces faces away from the rotor of the driving motor. Among them, a mounting groove is used to fix and accommodate a breathable valve, and the groove bottom or groove wall of a mounting groove includes an opening. One side surface includes a bearing groove, wherein the bearing groove is used to fix the outer ring of a bearing, and the inner ring of a bearing is used to drive and connect one end of the motor shaft of the driving motor. The other side surface is used to fix a cover plate, and the cover plate is used to enclose at least part of the other side surface to form an accommodating cavity. The groove bottom of a bearing groove includes a through hole, wherein the through hole is used to connect a bearing groove and an accommodating cavity, and the other side surface includes another opening, wherein the other opening is exposed to an accommodating cavity, and the other opening is used to connect an opening through an internal channel of an end cover, and the axis of an opening intersects with the axis of a mounting groove.

[0005] In the embodiment of the present application, the other side of the two side surfaces faces away from the rotor of the drive motor, the bottom of the bearing groove includes a through hole, and the through hole is used to connect the bearing groove and the accommodating cavity, and the other side surface includes another opening, so that the opening direction of the other opening along the axis of the drive motor faces away from the stator of the drive motor, thereby preventing the cooling oil in the sleeve from evaporating at the high temperature of the drive motor to form gaseous cooling oil directly entering the other opening through the through hole from the bearing groove, which is conducive to extending the oil and gas condensation path. 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 enter the other opening through the accommodating cavity.

[0006] In an embodiment of the present application, another opening is used to connect an opening through the internal channel of the end cover, so that the oil and gas coming out of the sleeve can enter from the other opening and then be discharged from the drive motor through the internal channel of the end cover, an opening and the mounting groove in sequence, so that while the oil and gas discharge ensures the balance of air pressure inside and outside the drive motor, the flow path of the gaseous cooling oil in the end cover is also longer, thereby extending the condensation path of the gaseous cooling oil, which is beneficial to the condensation of the gaseous cooling oil.

[0007] In an embodiment of the present application, the axis of an opening intersects with the axis of the mounting groove, so that the path of the internal channel connected to the opening is longer, thereby extending the condensation path of the gaseous cooling oil. In addition, when the axial dimension of the cover plate is small, by intersecting the axis of the opening with the axis of the mounting groove, the condensation path of the gaseous cooling oil in the oil gas can be extended, which is conducive to condensing the gaseous cooling oil, and then recycling the cooling oil, improving the utilization efficiency of the cooling oil. Or by intersecting the axis of the opening with the axis of the mounting groove, the axial dimension of the end cover can be made smaller while satisfying the extension of the condensation path of other cooling oils, thereby reducing the axial dimension of the drive motor.

[0008] In the drive motor provided by the embodiment of the present application, the through hole connects the bearing groove and the accommodating cavity, and another opening connects the accommodating cavity and an opening through the internal channel of the end cover, so that the oil and gas in the sleeve are discharged through the bearing groove, the through hole, the accommodating cavity, the other opening, the internal channel of the end cover and an opening in sequence, extending the condensation path of the gaseous cooling oil in the oil and gas, which is conducive to the condensation of the gaseous cooling oil. The axis of an opening intersects with the axis of the mounting groove, so that the internal channel between one opening and another opening is extended, and the end cover can also extend the condensation path of the oil and gas when the axial dimension is small.

[0009] In one embodiment, an opening is arranged between an axis of a mounting slot and a stator of the driving motor along the axial direction of the driving motor.

[0010] In the embodiment of the present application, an opening is arranged between the axis of the mounting slot and the stator of the driving motor along the axial direction of the driving motor, so that it is convenient to process an opening from the mounting slot and simplify the processing technology. It is beneficial to make an opening close to the stator of the driving motor at an angle, and it is beneficial to make the internal channel of the end cover inclined, thereby extending the condensation path of the oil gas and facilitating the condensation of the gaseous cooling oil.

[0011] In one embodiment, an end cover further includes a first protrusion, a first protrusion protruding from an end cover away from a stator of the driving motor, and a mounting groove is formed in the first protrusion.

[0012] In the embodiment of the present application, the first protrusion is away from the stator protrusion of the drive motor from the end cover, and the installation groove is formed in the first protrusion, so that the axis of an opening in the installation groove can be tilted from the side away from the stator toward the stator, extending the length of the internal channel connected by an opening, and also allowing an opening to have a larger tilt angle when the end cover is thin, extending the oil and gas condensation path, which is conducive to the condensation of gaseous cooling oil. The first protrusion is away from the stator protrusion of the drive motor from the end cover, so that the first protrusion of the end cover has sufficient thickness to open the installation groove without affecting the strength of the end cover. The installation 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.

[0013] In one embodiment, along the radial direction of the drive motor, a distance between the other opening and the axis of the drive motor is greater than half of an inner diameter of a bearing groove.

[0014] In the embodiment of the present application, since the bearing slot occupies the axial portion of the corresponding end cover, another opening needs to be opened away from the position of the bearing slot. The distance between the other opening and the axis of the drive motor is greater than half of the inner diameter of the bearing slot, so that the internal channel path connected to the other opening can be opened longer, thereby extending the condensation path of the oil and gas, which is beneficial to the condensation of the gaseous cooling oil.

[0015] In one embodiment, an internal channel of an end cover includes a first channel, and the first channel extends from another opening to the stator of the drive motor along the axial direction of the drive motor, and the first channel is used to communicate with an opening.

[0016] In the embodiment of the present application, the first channel extends from another opening to the stator of the drive motor along the axial direction of the drive motor, so that one opening can be connected to the first channel in a direction inclined toward the stator side of the drive motor, thereby facilitating the extension of the condensation path of the oil and gas between one opening and another opening, and facilitating the condensation of the gaseous cooling oil. The gas in the accommodating cavity enters the first channel from another opening, and then is discharged from the drive motor from an opening, the mounting groove, and the breathable valve.

[0017] In one embodiment, the inner wall of a first channel includes a communication port, and the communication port is used to connect a first channel and an opening. Wherein, along the axial direction of the drive motor, the distance between an opening and a notch of a bearing groove is greater than the distance between a communication port and a notch of a bearing groove.

[0018] In an embodiment of the present application, the inner wall of the first channel includes a connecting port, which is used to connect the first channel and an opening, so that the oil and gas in the accommodating chamber can flow through another opening, the first channel, the connecting port and an opening in sequence.

[0019] In the embodiment of the present application, an opening and a connecting port are connected through the internal channel of the end cover, and the distance between an opening and the notch of the bearing groove along the axial direction of the drive motor is greater than the distance between the connecting port and the notch of the bearing groove, so that part of the internal channel between an opening and the connecting port can be tilted toward the stator in the end cover, and the length of the part of the internal channel between an opening and the connecting port can be increased, which is conducive to better condensation of gaseous cooling oil when it flows through an opening and the connecting port and the part of the internal channel between the two, and can also avoid the cooling oil after condensation from being blocked in the installation groove. The cooling oil after condensation can flow back to another opening along the part of the internal channel of the inclined end cover, and then flow back to the position of the through hole, avoiding leakage of the cooling oil. In addition, the distance between an opening and the notch of the bearing groove along the axial direction of the drive motor is greater than the distance between the connecting port and the notch of the bearing groove, so that an opening is away from the side compared with the connecting port, which is convenient for the processing of an opening and the connecting port.

[0020] In one embodiment, a mounting groove is spaced from another opening along the circumference of the drive motor, and a distance between an mounting groove and an axis of a through hole along the radial direction of the drive motor is greater than a distance between another opening and an axis of a through hole.

[0021] In an embodiment of the present application, the mounting groove and another opening are spaced circumferentially from each other along the driving motor, so that the internal channel between another opening and an opening of the mounting groove has not only axial and radial components, but also circumferential components, thereby extending the condensation path of the oil and gas between another opening and an opening, which is beneficial to the condensation of the gaseous cooling oil.

[0022] In the embodiment of the present application, the distance between the radial mounting groove and the axis of the through hole along the drive motor is greater than the distance between the axis of the other opening and 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 larger, so that the distance for the gaseous cooling oil to reach the mounting groove from the other opening is longer, so that the gaseous cooling oil can be better condensed. The distance between the radial mounting groove and the axis of the through hole along the drive motor is greater than the distance between the axis of the other opening and the through hole. The distance between the axis of the other opening and the through hole is smaller, which facilitates the oil and gas coming out of the through hole to quickly enter the other opening, speeds up the discharge of the high-pressure gas in the sleeve, and is beneficial to the balance of the air pressure inside and outside the drive motor.

[0023] In one embodiment, the aperture of the other opening is larger than the aperture of the one opening, and the aperture of the one opening is smaller than half of the inner diameter of the one mounting groove.

[0024] In an embodiment of the present application, the aperture of another opening is larger than that of one opening. The larger aperture of the other opening allows the oil and gas in the accommodating cavity to enter the other opening faster and more, and then enter the one opening, which is beneficial to the discharge of oil and gas in the sleeve and to maintaining the air pressure balance in the sleeve of the drive motor. The smaller aperture of one opening is beneficial to the fact that the gaseous cooling oil cannot be quickly discharged from the opening, and the gaseous cooling oil contacts the inner wall of the internal channel in a smaller space, so that the gaseous cooling oil is better condensed in the internal channel of the end cover between one opening and the other opening.

[0025] In the embodiment of the present application, the aperture of an opening is smaller than half of the inner diameter of an installation groove. Since the oil and gas can condense between the two openings, the smaller aperture of one opening can, on the one hand, enable the gaseous cooling oil to be better condensed in the internal channel of the end cover. On the other hand, it also enables the opening to be connected to the internal channel of the end cover from the groove wall or the groove bottom of the installation groove, thereby avoiding the aperture of one opening being too large and penetrating the groove wall or the groove bottom of the installation groove and failing to connect to the internal channel of the end cover.

[0026] In one embodiment, the other side further comprises a plurality of fixing holes, which are arranged around a through hole at intervals along the circumference of the drive motor, and the plurality of fixing holes are used to fix a cover plate. In which, along the radial direction of the drive motor, the distance between at least some of the fixing holes and a through hole is greater than the distance between another opening and the through hole.

[0027] In an embodiment of the present application, a plurality of fixing holes are used to fix the cover plate, and the plurality of fixing holes are arranged around the through hole at intervals along the circumference of the drive motor, which is conducive to fixing the cover plate more firmly, and is also conducive to isolating the accommodating cavity enclosed by the cover plate and the end cover from the outside, thereby preventing leakage of gaseous cooling oil from the accommodating cavity.

[0028] In the embodiment of the present application, along the radial direction of the drive motor, the distance between at least part of the fixed holes and the through hole is greater than the distance between another opening and the through hole, so that the other opening can be exposed in the accommodating cavity, so that the high-pressure gas discharged from the sleeve to the accommodating cavity can enter the other opening, and then flow through the connecting port, the second channel, an opening and the mounting groove in sequence. If the distance between at least part of the fixed holes and the through hole is less than the distance between the other opening and the through hole, the other opening needs to avoid the fixed hole when arranged, which will make the other opening farther away from the through hole, so that under the condition of ensuring that a sufficiently long internal channel of the end cover is provided for the condensation of the gaseous cooling oil, the overall height of the entire flow path needs to be moved up along the axial direction of the mounting groove, and the distance between at least part of the fixed holes and the through hole is set to be greater than the distance between the other opening and the through hole, so that the other opening can be opened at a lower position along the axial direction of the mounting groove, which is conducive to the entire path through which the gaseous cooling oil and the high-pressure gas flow will not occupy the space outside the end cover along the axial direction of the mounting groove, thereby avoiding the increase in the size of the drive motor along the axial direction of the mounting groove, which is conducive to the miniaturization layout of the drive motor and the power assembly.

[0029] In one embodiment, an end cover also includes a groove, a groove is recessed from an end cover toward the stator of the drive motor, a notch of a groove is used to enclose a cover plate to form a accommodating cavity, another opening is formed at the bottom of a groove, and a through hole penetrates the bottom of a groove.

[0030] In an embodiment of the present application, the groove is recessed from the end cover toward the stator of the drive motor, and the notch of the groove is used to enclose the cover plate to form a receiving cavity. The groove is used to enclose the cover plate to form a receiving cavity, which can reduce the axial length of the drive motor. The through hole runs through the bottom of the groove, so that the oil and gas in the sleeve can be discharged through the through hole and enter another opening. Another opening is formed at the bottom of the groove, so that the distance between the other opening and the through hole and the sleeve is closer, so that the oil and gas in the sleeve can be quickly discharged from the other opening. In addition, when separating the cover plate and the end cover, the groove facilitates the removal tool to abut the bottom of the groove to pry open the cover plate.

[0031] In one embodiment, the other side further includes a second protrusion, the second protrusion faces away from the stator protrusion of the motor, and the second protrusion is exposed in an accommodating cavity. The second protrusion surrounds a through hole, and the second protrusion is arranged between the through hole and the other opening in the radial direction of the drive motor. The distance between the second protrusion and the through hole in the radial direction of the drive motor is smaller than the distance between the second protrusion and the other opening.

[0032] In an embodiment of the present application, the second protrusion is away from the stator protrusion of the drive 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 another opening along the radial direction of the drive motor, so that the gaseous cooling oil coming out of the through hole needs to pass through the second protrusion when entering the other opening, and contact the second protrusion, which increases the contact surface area between the gaseous cooling oil and the other side, thereby facilitating the condensation of the gaseous cooling oil. The second protrusion is arranged between the through hole and another opening along the radial direction of the drive motor, which is also beneficial to reduce the direct impact of the condensed cooling oil on the motor shaft when it is discharged from the other opening, thereby reducing the loss of the motor shaft.

[0033] In the embodiment of the present application, the distance between the second protrusion and the through hole along the radial direction of the drive motor is smaller than the distance between the second protrusion and another opening, so that the second protrusion is arranged closer to the through hole, which is conducive to the rapid condensation of the gaseous cooling oil coming out of the through hole. It is also conducive to the second protrusion to better reinforce the through hole.

[0034] In one embodiment, the other side further includes two third protrusions, the two third protrusions are away from the stator protrusion of the drive motor, and the two third protrusions are exposed in an accommodating cavity. The two third protrusions are arranged on both sides of the other opening along the circumferential direction of the drive motor. A through hole, a second protrusion and two third protrusions are arranged in sequence along the radial direction of the drive motor. The length of at least one third protrusion along the radial direction of the drive motor is greater than the distance between another opening and a second protrusion.

[0035] 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 accommodating cavity, which is beneficial for the gaseous cooling oil to have more contact area with the shell of the end cover when in the accommodating cavity, which is beneficial for the heat dissipation of the gaseous cooling oil and accelerates the condensation rate of the gaseous cooling oil.

[0036] In the embodiment of the present application, the opening of another opening will reduce the strength of the end cover. Arranging two third protrusions on both sides of the other opening along the circumference of the drive motor can strengthen the strength of the end cover and increase the reliability of the end cover.

[0037] In the embodiment of the present application, the radial through hole, the second protrusion and the two third protrusions are arranged in sequence along the driving motor, so that the third protrusion can also strengthen the second protrusion and improve the overall strength of the end cover.

[0038] In an embodiment of the present application, the length of at least one third protrusion along the radial direction of the drive motor is greater than the distance between another opening and a second protrusion, and the distance between another opening and a second protrusion is smaller, which is conducive to the oil and gas discharged from the through hole to pass through the second protrusion faster and enter the other opening, thereby speeding up the discharge process of the oil and gas.

[0039] In one embodiment, the other side further includes two fourth protrusions, the two fourth protrusions are away from the stator protrusion of the drive motor, and the two fourth protrusions are exposed in an accommodating cavity. The two fourth protrusions are arranged at both ends of a second protrusion along the circumference of the drive motor. The distance between each fourth protrusion and a cover plate along the axial direction of the drive motor is smaller than the distance between a second protrusion and a cover plate.

[0040] In the embodiment of the present application, the fourth protrusion is used to support the cover plate, and the two fourth protrusions are arranged at both ends of the second protrusion along the circumference of the drive motor, which is conducive to the relatively dispersed arrangement of the two fourth protrusions, so that the two fourth protrusions can better support the cover plate, thereby avoiding the cover plate and the second protrusion from being tightly attached to hinder the oil and gas from passing through the second protrusion into another opening, and avoiding the oil and gas in the sleeve from being unable to be discharged.

[0041] In the embodiment of the present application, the distance between each fourth protrusion and the cover plate along the axial direction of the drive motor is smaller than the distance between the second protrusion and the cover plate, so that even if the drive motor is squeezed along the axial direction of the drive motor and the cover plate is deformed, the second protrusion and the cover plate can be spaced apart by the two fourth protrusions, so that the oil and gas in the sleeve can be discharged normally, thereby ensuring the normal operation of the drive motor.

[0042] In a second aspect, the present application provides a power assembly, which includes a reducer and a drive motor as in the first aspect, wherein an input shaft of the reducer is drivingly connected to a motor shaft of the drive motor.

[0043] In the drive motor in the embodiment of the present application, the drive motor uses a through hole to connect the bearing groove and the accommodating cavity, and another opening connects the accommodating cavity and an opening through the internal channel of the end cover, which is beneficial to extend the condensation path of the oil and gas in the sleeve and the condensation of the gaseous cooling oil. The axis of an opening intersects with the axis of the mounting groove, so that the path of the internal channel connected to an opening is longer, thereby extending the condensation path of the gaseous cooling oil. The condensed cooling oil can flow back to the other opening along the inclined internal channel, and then flow back to the position of the through hole, thereby avoiding leakage of the cooling oil of the drive motor and improving the reliability of the powertrain.

[0044] In a third aspect, the present application provides an electric vehicle, comprising a frame, a power battery and a powertrain as in the second aspect, wherein the frame is used to fix the power battery and the powertrain, and the drive motor of the powertrain is used to receive electrical energy provided by the power battery and drive the wheels of the electric vehicle through a reducer of the powertrain.

[0045] The powertrain in the embodiment of the present application includes a drive motor, which uses a through hole to connect the bearing groove and the accommodating cavity, and another opening connects the accommodating cavity and an opening through the internal channel of the end cover, which is beneficial to extend the condensation path of the oil and gas in the sleeve and the condensation of the gaseous cooling oil. The axis of an opening intersects with the axis of the mounting groove, so that the path of the internal channel connected to an opening is longer, thereby extending the condensation path of the gaseous cooling oil. In addition, when the axial dimension of the cover plate is small, by intersecting the axis of the opening with the axis of the mounting groove, the condensation path of the gaseous cooling oil in the oil and gas can be extended, which is beneficial to condense the gaseous cooling oil, and then recycle and reuse the cooling oil, improve the utilization efficiency of the cooling oil, improve the reliability of the powertrain, and then improve the overall performance of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments of the present application will be described below.

[0047] Figure 1 is a schematic diagram of an electric vehicle provided in an embodiment of the present application;

[0048] Figure 2 is a schematic diagram of a powertrain provided in an embodiment of the present application;

[0049] Figure 3 is a schematic diagram of a driving motor provided in an embodiment of the present application;

[0050] Figure 4 is another schematic diagram of the end cover of the drive motor provided in an embodiment of the present application;

[0051] Figure 5 This is an exploded view of the end cover of the drive motor provided in an embodiment of the present application;

[0052] Figure 6 is a schematic diagram of an end cap provided in an embodiment of the present application;

[0053] Figure 7 is another schematic diagram of the end cap provided in an embodiment of the present application;

[0054] Figure 8 yes Figure 3 A partial enlarged view of the M1 part of the middle drive motor;

[0055] Fig. 9 is another schematic diagram of the end cap provided in an embodiment of the present application;

[0056] Fig.10 yes Fig. 9 A partial enlarged view of the M2 part of the middle end cover;

[0057] Fig.11 yes Figure 3 A partial enlarged view of the M3 part of the middle drive motor;

[0058] Fig.12 yes Fig. 9 A partial enlarged view of the M4 portion of the middle end cover. DETAILED DESCRIPTION

[0059] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0060] The embodiment of the present application provides a driving motor for an electric vehicle, wherein the housing of the driving motor includes an end cover and a sleeve, wherein the sleeve is used to fix the stator of the driving motor and to accommodate the rotor of the driving motor, and the end cover includes a mounting groove and two side surfaces, wherein one of the two side surfaces faces the rotor of the driving motor, and the other of the two side surfaces faces away from the rotor of the driving motor. The mounting groove is used to fix and accommodate a breathable valve, and the groove bottom or groove wall of the mounting groove includes an opening. One side surface includes a bearing groove, wherein the bearing groove is used to fix the outer ring of a bearing, and the inner ring of a bearing is used to drive and connect one end of the motor shaft of the driving motor. The other side surface is used to fix a cover plate, and the cover plate is used to enclose at least part of the other side surface to form an accommodating cavity. The groove bottom of the bearing groove includes a through hole, wherein the through hole is used to connect the bearing groove and the accommodating cavity, and the other side surface includes another opening, wherein the other opening is exposed to the accommodating cavity, and the other opening is used to connect an opening through the internal channel of the end cover, and the axis of the opening intersects with the axis of the mounting groove.

[0061] In the drive motor provided by the embodiment of the present application, the through hole connects the bearing groove and the accommodating cavity, and another opening connects the accommodating cavity and an opening through the internal channel of the end cover, so that the oil and gas in the sleeve are discharged through the bearing groove, the through hole, the accommodating cavity, the other opening, the internal channel of the end cover and an opening in sequence, extending the condensation path of the gaseous cooling oil in the oil and gas, which is conducive to the condensation of the gaseous cooling oil. The axis of an opening intersects with the axis of the mounting groove, so that the internal channel between one opening and another opening is extended, and the end cover can also extend the condensation path of the oil and gas when the axial dimension is small.

[0062] The drive motor provided in the embodiment of the present application is applied to a powertrain, and the powertrain is applied to an electric vehicle to improve the overall performance of the electric vehicle.

[0063] Figure 1 1 is a schematic diagram of an electric vehicle 1 provided in an embodiment of the present application. Figure 1As shown, the electric vehicle 1 includes a power assembly 10, a frame 20, a power battery 30 and wheels 40. The power assembly 10 and the power battery 30 are fixed to the frame 20. The power assembly 10 is used to receive power from the power battery 30 and to drive the wheels 40.

[0064] In the embodiment of the present application, the power battery 30 may also be referred to as a battery pack. In the embodiment of the present application, the electric vehicle 1 refers to a wheeled device driven or towed by a power device.

[0065] Figure 2 1 is a schematic diagram of a powertrain 10 provided in an embodiment of the present application. Figure 2 As shown, the powertrain 10 includes a driving motor 100, a reducer 200 and a motor controller 300. In one embodiment, the powertrain 10 includes a driving motor 100 and a reducer 200.

[0066] In the embodiment of the present application, the motor controller 300 is used to receive direct current from the power battery 30 and output alternating current to the drive motor 100. The stator of the drive motor 100 receives the alternating current to drive the motor shaft to rotate. The drive motor 100 is used to drive and connect the reducer 200. The reducer 200 is used to drive and connect the wheels 40 of the electric vehicle 1.

[0067] In the embodiment of the present application, the motor shaft of the driving motor 100 is used to drive the input shaft of the reducer 200. The input shaft of the reducer 200 is connected to the output shaft of the reducer 200 through a gear assembly. In the embodiment of the present application, the gear assembly includes a single-speed reduction gear assembly, a two-speed or multi-speed reduction gear assembly.

[0068] The electrical energy provided by the motor controller 300 is converted into kinetic energy and transmitted to the reducer input shaft in the reducer 200. The reducer input shaft transmits power to the internal gears of the reducer 200. The output shaft of the reducer 200 is used to transmit the power of the drive motor 100 to the wheel 40.

[0069] Figure 3 1 is a schematic diagram of a drive motor 100 provided in an embodiment of the present application. Figure 3 As shown, the driving motor 100 includes a stator 130a, a rotor 130b and a motor shaft 130c. The rotor 130b is fixedly sleeved on the motor shaft 130c. After receiving alternating current, the stator 130a drives the rotor 130b to rotate, thereby driving the motor shaft 130c to rotate.

[0070] A large amount of heat is generated during the operation of the drive motor 100. In order to prevent the internal gas from expanding, a breather valve needs to be installed to balance the internal and external air pressures of the drive motor. In order to prevent the stator and rotor inside the drive motor from being overheated, cooling oil needs to be introduced to cool down the stator, rotor and other heat-generating components. Cooling oil is easily converted into oil mist at high temperatures. If the oil mist accumulates in the breather valve, it will not only cause the breather valve to be blocked, but may also cause the cooling oil to leak out of the breather valve.

[0071] In the present application, in the end cover of the driving motor, a through hole is opened to connect the bearing groove and the accommodating cavity, and another opening is opened to connect the accommodating cavity and an opening through the internal channel of the end cover. The axis of one opening intersects with the axis of the mounting groove, thereby extending the condensation path of the gaseous cooling oil in the oil and gas. In addition, the end cover can extend the condensation path of the oil and gas when the axial dimension is small, so that the condensed cooling oil can flow back into the inner cavity of the driving motor.

[0072] The drive motor 100 provided in an embodiment of the present application will be described in detail below.

[0073] Figure 4 is another schematic diagram of the end cover 110 of the drive motor 100 provided in an embodiment of the present application. Figure 5 is an exploded view of the end cover 110 of the drive motor 100 provided in an embodiment of the present application. Figure 6 is a schematic diagram of the end cover 110 provided in an embodiment of the present application, Figure 7 It is another schematic diagram of the end cover 110 provided in an embodiment of the present application.

[0074] In one embodiment, if Figures 3 to 7 As shown, a housing of a drive motor 100 for an electric vehicle 1 includes an end cover 110 and a sleeve 120. The sleeve 120 is used to fix the stator 130a of the drive motor 100 and accommodate the rotor 130b of the drive motor 100. The end cover 110 includes a mounting groove 111 and two side surfaces 110a and 110b. One side surface 110a of the two side surfaces 110a and 110b faces the rotor 130b of the drive motor 100, and the other side surface 110b of the two side surfaces 110a and 110b faces away from the rotor 130b of the drive motor 100. The mounting groove 111 is used to fix and accommodate a breathable valve 170, and the groove bottom or groove wall of the mounting groove 111 includes an opening 114a. Figure 6 As shown, the side surface 110a includes a bearing groove 140, and the bearing groove 140 is used to fix the outer ring of a bearing (not shown), and the inner ring of a bearing is used to drive and connect one end of the motor shaft 130c of the drive motor 100. Figure 5As shown, the side surface 110b is used to fix a cover plate 150, and the cover plate 150 is used to enclose at least a portion of the side surface 110b to form a receiving cavity 160. Figure 6 As shown, the groove bottom 140a of the bearing groove 140 includes a through hole 113, and the through hole 113 is used to connect the bearing groove 140 and the accommodating cavity 160. Figure 5 and Figure 4 As shown, the side surface 110 b includes another opening 114 b , which is exposed to the accommodating cavity 160 . The opening 114 b is used to communicate with the opening 114 a through the internal channel 115 of the end cover 110 , and the axis of the opening 114 a intersects with the axis Z of the mounting groove 111 .

[0075] In the embodiment of the present application, the side surface 110b of the two side surfaces 110a and 110b faces away from the rotor 130b of the drive motor 100, the groove bottom 140a of the bearing groove 140 includes a through hole 113, and the through hole 113 is used to connect the bearing groove 140 and the accommodating chamber 160, and the side surface 110b includes an opening 114b, so that the opening direction of the opening 114b along the axial direction O of the drive motor faces away from the stator 130a of the drive motor 100, thereby preventing the cooling oil in the sleeve 120 from evaporating at high temperature of the drive motor 100 to form gaseous cooling oil directly entering the opening 114b from the bearing groove 140 through the through hole 113, which is conducive to extending the oil and gas condensation path. The opening 114b is exposed to the accommodating chamber 160, so that the high-pressure gas in the sleeve 120 can be discharged into the accommodating chamber 160 through the through hole 113, and then enter the opening 114b through the accommodating chamber 160.

[0076] In the embodiment of the present application, the opening 114b is used to connect the opening 114a through the internal channel 115 of the end cover 110, so that the oil and gas coming out of the sleeve 120 can enter from the opening 114b and then pass through the internal channel 115 of the end cover 110, the opening 114a and the mounting groove 111 in sequence to discharge the drive motor 100, so that while the oil and gas discharge ensures the balance of air pressure inside and outside the drive motor 100, the flow path of the gaseous cooling oil in the end cover 110 is also longer, thereby extending the condensation path of the gaseous cooling oil, which is beneficial to the condensation of the gaseous cooling oil.

[0077] In the embodiment of the present application, the axis of the opening 114a intersects with the axis Z of the mounting groove 111, so that the path of the internal channel 115 connected to one opening 114 is longer, thereby extending the condensation path of the gaseous cooling oil. In addition, when the axial dimension of the cover plate 150 is small, by intersecting the axis of the opening 114a with the axis Z of the mounting groove 111, the condensation path of the gaseous cooling oil in the oil gas can be extended, which is conducive to condensing the gaseous cooling oil, and then recycling the cooling oil, thereby improving the utilization efficiency of the cooling oil. Alternatively, by intersecting the axis of the opening 114a with the axis Z of the mounting groove 111, the axial dimension of the end cover 110 can be reduced while satisfying the requirement of extending the condensation path of the gaseous cooling oil, thereby reducing the axial dimension of the drive motor 100.

[0078] In one embodiment, the distance between the air 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 valve 170 does not occupy too much space of the drive motor 100, which is conducive to miniaturization of the drive motor 100.

[0079] Figure 8 yes Figure 3 A partial enlarged view of the M1 portion of the driving motor 100.

[0080] In one embodiment, if Figure 3 and Figure 8 As shown, the opening 114 a is arranged between the axis Z of the mounting slot 111 and the stator 130 a of the driving motor 100 along the axial direction O of the driving motor 100 .

[0081] In the embodiment of the present application, the opening 114a is arranged between the axis Z of the mounting groove 111 and the stator 130a of the driving motor 100 along the axial direction O of the driving motor 100, so as to facilitate the processing of the opening 114a from the mounting groove 111 and simplify the processing technology. It is also beneficial to make the opening 114a inclined close to the stator 130a of the driving motor 100, and to make the internal channel 115 of the end cover 110 inclined, so as to extend the condensation path of the oil gas, which is beneficial to the condensation of the gaseous cooling oil.

[0082] Fig. 9 is another schematic diagram of the end cap 110 provided in the embodiment of the present application, Fig.10 yes Fig. 9 A partial enlarged view of the M2 portion of the middle end cover 110 .

[0083] In one embodiment, if Figure 5 , Fig. 9 and Fig.10As shown, the end cover 110 further includes a first protrusion 118 a , which protrudes from the end cover 110 away from the stator 130 a of the drive motor 100 , and the mounting groove 111 is formed in the first protrusion 118 a .

[0084] In the embodiment of the present application, the first protrusion 118a protrudes from the end cover 110 away from the stator 130a of the drive motor 100, and the mounting groove 111 is formed in the first protrusion 118a, so that the axis of the opening 114a in the mounting groove 111 can be tilted from the side away from the stator 130a toward the stator 130a, extending the length of the internal channel 115 connected by the opening 114a, and also allowing the opening 114a to have a larger tilt angle when the end cover 110 is thin, extending the oil and gas condensation path, which is conducive to the condensation of gaseous cooling oil. The first protrusion 118a protrudes from the end cover 110 away from the stator 130a of the drive 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. The mounting groove 111 is formed in the first protrusion 118a, so that the axial length of other parts of the end cover 110 can be smaller, thereby reducing the weight of the end cover 110.

[0085] In one embodiment, if Figure 3 and Figure 8 As shown, the length of the first protrusion 118 a along the axial direction O of the driving motor 100 is greater than half of the inner diameter of the mounting groove 111 .

[0086] In the embodiment of the present application, the length of the first protrusion 118a along the axial direction O of the drive motor 100 is greater than half of the inner diameter of the mounting groove 111, so that the axis inclination angle of the opening 114a can be made larger, which is conducive to extending the oil and gas flow path. It also allows the first protrusion 118a to have enough space to open the mounting groove 111 for accommodating a breathable valve 170, and also allows the opening 114a in the mounting groove 111 to be inclined.

[0087] In one embodiment, the distance between the first protrusion 118 a and the through hole 113 is greater than the distance between the opening 114 b and the through hole 113 .

[0088] 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. 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 small, 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 large, so that the distance for the gaseous cooling oil to reach the mounting groove 111 from the opening 114b is long, so that the gaseous cooling oil can be condensed by the connecting section, thereby improving the utilization efficiency of the cooling oil.

[0089] Fig.11 yes Figure 3 A partial enlarged view of the M3 portion of the middle drive motor 100.

[0090] In one embodiment, if Figure 3 and Fig.11 As shown, along the radial direction R of the drive motor 100 , the distance between the opening 114 b and the axis of the drive motor 100 is greater than half of the inner diameter of the bearing groove 140 .

[0091] In the embodiments of the present application, Fig.11 As shown, the distance between the opening 114b and the axis of the drive motor 100 is recorded as L1, and half of the inner diameter of the bearing groove 140 is recorded as L2. Since the bearing groove 140 occupies the axial portion of the corresponding part of the end cover 110, the opening 114b avoids the position of the bearing groove 140. L1>L2, so that the internal channel 115 connected to the opening 114b can be opened longer, thereby extending the condensation path of the oil and gas, which is beneficial to the condensation of the gaseous cooling oil.

[0092] In one embodiment, if Figure 3 and Figure 8 As shown, the internal channel 115 of the end cover 110 includes a first channel 115b. The first channel 115b extends from the opening 114b to the stator 130a of the drive motor 100 along the axial direction O of the drive motor 100. The first channel 115b is used to communicate with the opening 114a.

[0093] In the embodiment of the present application, the first channel 115b extends from the opening 114b to the stator 130a of the drive motor 100 along the axial direction O of the drive motor 100, so that the opening 114a can be connected to the first channel 115b in a direction inclined toward the stator 130a side of the drive motor 100, thereby facilitating the extension of the condensation path of the oil gas between the opening 114a and the opening 114b, and facilitating the condensation of the gaseous cooling oil. The gas in the accommodating cavity 160 enters the first channel 115b from the opening 114b, and then is discharged from the drive motor 100 from the opening 114a, the mounting groove 111, and the breathable valve 170.

[0094] In one embodiment, the length of the first channel 115 b along the axial direction O of the drive motor 100 is greater than the distance between the opening 114 b and the groove bottom 140 a of the bearing groove 140 .

[0095] In the embodiment of the present application, the length of the first channel 115b along the axial direction O of the drive motor 100 is greater than the distance between the opening 114b and the bottom 140a of the bearing groove 140, so that the opening 114a can be inclined toward the stator 130a side and connected to the first channel 115b through the inclined channel, which is beneficial to extend the condensation path of the oil and gas and facilitate the condensation of the gaseous cooling oil.

[0096] In one embodiment, if Figure 3 and Figure 8 As shown, the inner wall of the first channel 115b includes a connecting port 112, and the connecting port 112 is used to connect the first channel 115b and the opening 114a. The distance between the opening 114a and the notch of the bearing groove 140 along the axial direction O of the drive motor 100 is greater than the distance between the connecting port 112 and the notch of the bearing groove 140.

[0097] In the embodiment of the present application, the inner wall of the first channel 115b includes a connecting port 112, which is used to connect the first channel 115b and the opening 114a, so that the oil and gas in the accommodating chamber 160 can flow through the opening 114b, the first channel 115b, the connecting port 112 and the opening 114a in sequence.

[0098] In the embodiments of the present application, Figure 3As shown, along the axial direction O of the drive motor 100, the distance between the opening 114a and the notch of the bearing groove 140 is recorded as L3, and the distance between the connecting port 112 and the notch of the bearing groove 140 is recorded as L4. The opening 114a and the connecting port 112 are connected through the partial internal channel 115 of the end cover 110, and L3>L4. The partial internal channel 115 between the opening 114a and the connecting port 112 can be tilted toward the stator 130a in the end cover 110, and the length of the partial internal channel 115 between the opening 114a and the connecting port 112 can be increased, which is conducive to better condensation of gaseous cooling oil when it flows through the opening 114a and the connecting port 112 and the partial internal channel 115 therebetween, and can also prevent the condensed cooling oil from being blocked in the mounting groove 111. The condensed cooling oil can flow back to the opening 114b along the inclined partial internal channel 115 of the end cover 110, and then flow back to the position of the through hole 113, thereby avoiding leakage of the cooling oil. In addition, L3>L4, so that the opening 114a is away from the side surface 110a compared to the communication port 112, which facilitates the processing of the opening 114a and the communication port 112.

[0099] In one embodiment, if Figure 3 and Figure 8 As shown, the internal channel 115 of the end cover 110 further includes a second channel 115a, and the second channel 115a is used to connect the opening 114a and the communication port 112. The length of the second channel 115a is greater than the length of its projection along the radial direction R of the drive motor and the length of its projection along the axial direction O of the drive motor. The projection length of the second channel 115a along the axial direction O of the drive motor is greater than the length of its projection along the radial direction R of the drive motor.

[0100] In the embodiment of the present application, the second channel 115a is used to connect the opening 114a and the connecting port 112, so that the gas entering the opening 114b can pass through the connecting port 112, the second channel 115a and the connecting port 112 in sequence and be discharged from the installation groove 111.

[0101] In the embodiment of the present application, the length of the second channel 115a is greater than the length of its projection along the radial direction R of the drive motor and the length of its projection along the axial direction O of the drive motor. The second channel 115a is a partial internal channel 115 arranged obliquely. Increasing the length of the second channel 115a is beneficial to the gaseous cooling oil flowing through the second channel 115a and then condensing in the second channel 115a and flowing back to the opening 114b and the through hole 113.

[0102] In the embodiment of the present application, the projection length of the second channel 115a along the axial direction O of the drive motor is greater than the projection length along the radial direction R of the drive motor, and the second channel 115a is arranged at a large inclination angle in the end cover 110, which is conducive to the cooling oil condensed in the second channel 115a to slide more smoothly along the inside of the second channel 115a to the opening 114b, which is conducive to the recovery of the cooling oil. The projection length of the second channel 115a along the axial direction O of the drive motor is greater than the projection length along the radial direction R of the drive motor, which is also conducive to making the second channel 115a have a longer length without increasing the size of the end cover 110 too much, thereby facilitating the condensation of the gaseous cooling oil in the second channel 115a.

[0103] In one embodiment, if Fig. 9 and Fig.10 As shown, the mounting groove 111 and the opening 114 b are spaced apart along the circumferential direction C of the drive 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 drive motor 100 is greater than the distance between the axis of the opening 114 b and the axis of the through hole 113 .

[0104] In the embodiment of the present application, the mounting groove 111 and the opening 114b are spaced along the circumferential direction C of the drive motor 100, so that the internal channel 115 between the opening 114b and the opening 114a of the mounting groove 111 has not only axial and radial path components, but also circumferential path components, thereby extending the condensation path of the oil and gas between the opening 114b and the opening 114a, which is beneficial to the condensation of the gaseous cooling oil.

[0105] In the embodiment of the present application, the distance between the axis of the mounting groove 111 and the through hole 113 is recorded as L5, and the distance between the axis of the opening 114b and the through hole 113 is recorded as L6. L5>L6. After the gaseous cooling oil enters the opening 114b, L5 is larger, so that the distance for the gaseous cooling oil to reach the mounting groove 111 from the opening 114b is longer, so that the gaseous cooling oil can be better condensed. L5>L6, L6 is smaller, which facilitates the oil and gas coming out of the through hole 113 to quickly enter the opening 114b, accelerates the discharge of the high-pressure gas in the sleeve 120, and is conducive to the balance of the internal and external air pressures of the driving motor 100.

[0106] like Fig.10 As shown, in the embodiment of the present application, the axis Z of the mounting groove 111 intersects with the radial direction R of the drive motor 100 .

[0107] In one embodiment, if Figure 4 , Figure 5 and Figure 8 As shown, the aperture of the opening 114 b is larger than that of the opening 114 a , and the aperture of the opening 114 a is smaller than half of the inner diameter of one mounting groove 111 .

[0108] In the embodiment of the present application, the aperture of the opening 114b is recorded as L7, and the aperture of the opening 114a is recorded as L8, L7>L8, L7 is larger, so that the oil and gas in the accommodating chamber 160 can enter the opening 114b faster and more, and then enter the opening 114a, which is beneficial to the discharge of oil and gas in the sleeve 120, and is beneficial to maintaining the air pressure balance in the sleeve 120 of the drive motor 100. L8 is smaller, which is beneficial to the gaseous cooling oil not being able to be quickly discharged from the opening 114a, and the gaseous cooling oil contacts the inner wall of the internal channel 115 in a smaller space, so that the gaseous cooling oil is better condensed in the internal channel 115 of the end cover 110 between the opening 114a and the opening 114b.

[0109] In the embodiment of the present application, the aperture of the mounting groove 111 is recorded as L9, L8<0.5L9, because the oil gas can be condensed between the two openings 114a, 114b, L8 is small, on the one hand, the gaseous cooling oil can be better condensed in the internal channel 115 of the end cover 110, on the other hand, it also allows the opening 114a to be connected to the internal channel 115 of the end cover 110 from the groove wall or groove bottom of the mounting groove 111, avoiding L8 being too large and penetrating the groove wall or groove bottom of the mounting groove 111 and failing to connect to the internal channel 115 of the end cover 110. In one embodiment, when the mounting groove 111 is formed on 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 drive motor and fail to connect to the internal channel 115 of the end cover 110.

[0110] In one embodiment, if Figure 5 , Fig. 9 and Fig.10 As shown, the side surface 110b further includes a plurality of fixing holes 116, which are arranged around the through hole 113 at intervals along the circumferential direction C of the drive motor, and the plurality of fixing holes 116 are used to fix the cover plate 150. In particular, along the radial direction R of the drive motor, the distance between at least some of the fixing holes 116 and the through hole 113 is greater than the distance between the opening 114b and the through hole 113.

[0111] In the embodiment of the present application, a plurality of fixing holes 116 are used to fix the cover plate 150. The plurality of fixing holes 116 are arranged at intervals around the through hole 113 along the circumferential direction C of the drive motor, which is beneficial for fixing the cover plate 150 more firmly and is also beneficial for isolating the accommodating cavity 160 enclosed by the cover plate 150 and the end cover 110 from the outside, thereby preventing leakage of gaseous cooling oil from the accommodating cavity 160.

[0112] In the embodiments of the present application, Fig.10As shown, along the radial direction R of the driving motor, the distance between at least part of the fixing hole 116 and the through hole 113 is recorded as L10, and the distance between the opening 114b and the through hole 113 is L11, L10>L11, so that the opening 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 114b, and then flow through the connecting port 112, the second channel 115a, the opening 114a and the mounting groove 111 in sequence. If L10<L11, the opening 114b needs to avoid the fixing hole 116 when being arranged, which will make the opening 114b farther away from the through hole 113, so that while ensuring that the internal channel 115 of the end cover 110 is long enough for the gaseous cooling oil to condense, the overall height of the entire flow path needs to be moved up along the axis Z direction of the mounting groove 111. If L10>L11, the opening 114b can be opened at a lower position along the axis Z direction of the mounting groove 111, which is beneficial for the entire path through which the gaseous cooling oil and high-pressure gas flow will not occupy the space outside the end cover 110 along the axis Z direction of the mounting groove 111, thereby avoiding an increase in the size of the drive motor 100 along the axis Z direction of the mounting groove 111, which is beneficial to the miniaturized layout of the drive motor 100 and the power assembly 10.

[0113] In one embodiment, the distance between some of the fixing holes 116 and the through hole 113 is smaller than the distance between the opening 114b and the through hole 113, so that the distance between this part of the fixing holes 116 and the through hole 113 is smaller, so that the side 110b does not need to form the opening 114b and does not need to reserve a large space to form the fixing holes 116, so that the accommodating cavity 160 formed by the cover plate 150 and the side 110b is as small as possible while meeting the exhaust requirements, thereby reducing the volume of the drive motor 100.

[0114] In one embodiment, Figure 5 , Fig. 9 and Fig.10 As shown, the end cover 110 also includes a groove 117, which is recessed from the end cover 110 toward the stator 130a of the drive motor 100. The notch of the groove 117 is used to enclose the cover plate 150 to form a accommodating cavity 160. The opening 114b is formed at the bottom 117a of the groove 117, and the through hole 113 passes through the bottom 117a of the groove 117.

[0115] In the embodiment of the present application, the groove 117 is recessed from the end cover 110 toward the stator 130a of the drive motor 100, and the notch of the groove 117 is used to enclose the cover plate 150 to form an accommodating chamber 160. The groove 117 is used to enclose the cover plate 150 to form an accommodating chamber 160, which can reduce the axial length O of the drive motor. The through hole 113 penetrates the groove bottom 117a of the groove 117, so that the oil and gas in the sleeve 120 can be discharged through the through hole 113 and enter the opening 114b. The opening 114b is formed at the groove bottom 117a of the groove 117, so that the distance between the opening 114b and the through hole 113 and the sleeve 120 is relatively close, so that the oil and gas in the sleeve 120 can be quickly discharged from the opening 114b. In addition, when separating the cover plate 150 and the end cover 110, the groove 117 is conducive to the removal tool abutting the groove bottom of the groove 117 to pry open the cover plate 150.

[0116] In one embodiment, if Figure 3 and Figure 5 As shown, the depth of the O-groove 117 along the axial direction of the driving motor is smaller than the groove width of the mounting groove 111 .

[0117] In the embodiment of the present application, the groove 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 groove depth of the groove 117 is too large, the end cover 110 will have no axial space to form the axial first channel 115b. Therefore, the depth of the groove 117 is smaller than the groove width of the installation groove 111 located at the end cover 110.

[0118] In one embodiment, if Figure 4 , Figure 5 and Fig.10 As shown, the side surface 110b further includes 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 100. Along the radial direction R of the drive motor 100, the distance between the second protrusion 118b and the through hole 113 is smaller than the distance between the second protrusion 118b and the opening 114b.

[0119] 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 when entering the opening 114b, and contacts the second protrusion 118b, thereby increasing the contact surface area between the gaseous cooling oil and the side 110b, which is conducive to the condensation of the gaseous cooling oil.

[0120] In the embodiments of the present application, Fig.10 As shown, the distance between the second protrusion 118b and the through hole 113 along the radial direction R of the drive 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 beneficial for the second protrusion 118b to better reinforce the through hole 113.

[0121] In one embodiment, the opening 114b and the through hole 113 are formed in the groove 117, so that the distance between the opening 114b and the through hole 113 and the sleeve 120 is relatively close, so that the oil and gas in the sleeve 120 can be quickly discharged from the opening 114b. In order to extend 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 exhausted and the cooling path of the gaseous cooling oil can be extended, thereby avoiding blockage and loss of the cooling oil.

[0122] In one embodiment, when the side surface 110b does not have the groove 117, in order to form the accommodation cavity 160, the cover plate 150 can be designed as a groove-shaped structure, and the groove-shaped 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 accommodation cavity 160. The second protrusion 118b can be formed on the flat portion of the side surface 110b.

[0123] In one embodiment, if Fig.10 As shown, the length of the second protrusion 118b is greater than or equal to one third of the circumference of the through hole 113 and less than or equal to one half of the circumference of the through hole 113. The second protrusion 118b can strengthen the through hole 113 while using less material, which is conducive to weight reduction.

[0124] Fig.12 yes Fig. 9 A partial enlarged view of the M4 portion of the middle end cover 110 .

[0125] In one embodiment, if Figure 4 , Figure 5 and Fig.12 As shown, the side surface 110b further includes two third protrusions 118c, the two third protrusions 118c protrude away from the stator 130a of the drive motor 100, and the two third protrusions 118c 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 drive motor. 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 drive motor.

[0126] In the embodiment of the present application, the two third protrusions 118c are away from the stator 130a protrusion of the drive motor 100, and the two third protrusions 118c are exposed in the accommodating cavity 160, which is beneficial for the gaseous cooling oil to have more contact area with the end cover 110 when in the accommodating cavity 160, which is beneficial for the heat dissipation of the gaseous cooling oil and accelerates the condensation rate of the gaseous cooling oil.

[0127] In the embodiment of the present application, the opening 114b will reduce the strength of the end cover 110. Arranging the two third protrusions 118c on both sides of the opening 114b along the circumferential direction C of the drive motor can strengthen the strength of the end cover 110 and increase the reliability of the end cover 110.

[0128] In the embodiment of the present application, the through hole 113 , the second protrusion 118 b and the two third protrusions 118 c are arranged in sequence along the radial direction R of the drive motor, so that the third protrusion 118 c can also strengthen the second protrusion 118 b and improve the overall strength of the end cover 110 .

[0129] In one embodiment, the length of at least one third protrusion 118c along the radial direction R of the drive motor is greater than the distance between the opening 114b and the second protrusion 118b.

[0130] In the embodiment of the present application, the length of at least one third protrusion 118c along the radial direction R of the drive motor is recorded as L12, and the distance between the opening 114b and the second protrusion 118b is recorded as L13. L12>L13. L13 is smaller, which is conducive to the oil and gas discharged from the through hole 113 to pass through the second protrusion 118b faster and enter the opening 114b, thereby accelerating the discharge process of the oil and gas.

[0131] In one embodiment, if Figure 4 , Figure 5 and Fig.10 As shown, the side surface 110b further includes two fourth protrusions 118d, the two fourth protrusions 118d protrude away from the stator 130a of the drive motor 100, and the two fourth protrusions 118d are exposed in the accommodating cavity 160. The two fourth protrusions 118d are arranged at both ends of the second protrusion 118b along the circumferential direction C of the drive motor. The distance between each fourth protrusion 118d and the cover plate 150 along the axial direction O of the drive motor is smaller than the distance between the second protrusion 118b and the cover plate 150.

[0132] 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 circumferential direction C of the drive motor, which is conducive to 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 and the second protrusion 118b from being tightly attached to each other and hindering the oil and gas from passing through the second protrusion 118b into the opening 114b, thereby avoiding the oil and gas in the sleeve 120 from being unable to be discharged.

[0133] In the embodiment of the present application, the distance between each fourth protrusion 118d and the cover plate 150 along the axial direction O of the drive motor is smaller than the distance between the second protrusion 118b and the cover plate 150, so that even if the drive motor 100 is squeezed along the axial direction O of the drive motor and the cover plate 150 is deformed, the second protrusion 118b and the cover plate 150 can be spaced apart by the two fourth protrusions 118d, so that the oil and gas in the sleeve 120 can be discharged normally, thereby ensuring the normal operation of the drive motor 100.

[0134] The above is a detailed introduction to the drive motor, powertrain and electric vehicle for electric vehicles provided in the embodiments of the present application. Specific examples are used in this article to illustrate the principles and embodiments of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for general technical personnel in this field, according to the ideas of the present application, there will be changes in the specific embodiments and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A drive motor for an electric vehicle, characterized in that: The housing of the drive motor includes an end cover and a sleeve, wherein the sleeve is used to fix the stator of the drive motor and accommodate the rotor of the drive motor, and the end cover includes a mounting groove 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, wherein: The one installation groove is used to fix and accommodate a breathable valve, and the groove bottom or groove wall of the one installation groove includes an opening; The one side surface includes a bearing groove, the one bearing groove is used to fix the outer ring of a bearing, and the inner ring of the one bearing is used to drive and connect one end of the motor shaft of the driving motor; The other side surface is used to fix a cover plate, and the cover plate is used to enclose at least a portion of the other side surface to form a receiving cavity; The bottom of the bearing groove includes a through hole, which is used to connect the bearing groove and the accommodating cavity. The other side includes another opening, which is exposed to the accommodating cavity. The other opening is used to connect the opening through the internal channel of the end cover, and the axis of the opening intersects with the axis of the mounting groove.

2. The drive motor according to claim 1, characterized in that: The one opening is arranged between the axis of the one mounting slot and the stator of the driving motor along the axial direction of the driving motor.

3. The drive motor according to claim 1 or 2, characterized in that: The one end cover also includes a first protrusion, the one first protrusion is away from the stator protrusion of the drive motor from the one end cover, and the one mounting groove is formed in the one first protrusion.

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

5. The drive motor according to any one of claims 1 to 4, characterized in that: The internal channel of the one end cover includes a first channel, and the one first channel extends from the other opening to the stator of the drive motor along the axial direction of the drive motor, and the one first channel is used to communicate with the one opening.

6. The driving motor according to claim 5, characterized in that: The inner wall of the first channel includes a communication port, and the communication port is used to connect the first channel and the opening, wherein: Along the axial direction of the drive motor, the distance between the one opening and the notch of the one bearing groove is greater than the distance between the one communicating port and the notch of the one bearing groove.

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

8. The drive motor according to any one of claims 1 to 7, characterized in that: The aperture of the other opening is larger than the aperture of the one opening, and the aperture of the one opening is smaller than half of the inner diameter of the one mounting groove.

9. The drive motor according to any one of claims 1 to 8, characterized in that: The other side surface further comprises a plurality of fixing holes, the plurality of fixing holes are arranged at intervals around the one through hole along the circumferential direction of the drive motor, and the plurality of fixing holes are used to fix 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. The driving motor according to any one of claims 1 to 9, characterized in that: The end cover also includes a groove, which is recessed from the end cover toward the stator of the drive motor. The notch of the groove is used to enclose the cover plate to form the accommodating cavity. The other opening is formed at the bottom of the groove, and the through hole passes through the bottom of the groove.

11. The drive motor according to any one of claims 1 to 10, characterized in that: The other side surface further includes a second protrusion, the second protrusion is away from the stator protrusion of the drive motor, and the second protrusion is exposed in the accommodating cavity, wherein: The one second protrusion surrounds the one through hole, and the one second protrusion is arranged between the one through hole and the other opening along the radial direction of the drive motor; Along the radial direction of the drive motor, a distance between the one second protrusion and the one through hole is smaller than a distance between the one second protrusion and the other opening.

12. The driving motor according to claim 11, characterized in that: The other side surface further includes two third protrusions, the two third protrusions are away from the stator protrusion of the drive motor, and the two third protrusions are exposed in the one accommodating cavity, wherein: The two third protrusions are arranged on both sides of the other opening along the circumference of the drive motor; The one through hole, the one second protrusion and the two third protrusions are arranged in sequence along the radial direction of the driving motor.

13. The driving motor according to claim 11, characterized in that: The other side surface further includes two fourth protrusions, the two fourth protrusions are away from the stator protrusion of the drive 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 one second protrusion along the circumferential direction of the driving motor; Along the axial direction of the drive motor, the distance between each of the fourth protrusions and the one cover plate is smaller than the distance between the one of the second protrusions and the one cover plate.

14. A powertrain, characterized in that: The power assembly includes a reducer and a drive motor as described in any one of claims 1 to 13, and an input shaft of the reducer is drivingly connected to a motor shaft of the drive motor.

15. An electric vehicle, characterized in that: The electric vehicle includes a frame, a power battery and a powertrain as described in claim 14, wherein the frame is used to fix the power battery and the powertrain, and the drive motor of the powertrain is used to receive electric energy provided by the power battery and drive the wheels of the electric vehicle through one of the reducers of the powertrain.

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