Oil cooling motor and oil cooling power assembly

Abstract

The utility model provides an oil cooling motor and an oil cooling power assembly. The oil cooling motor is used for driving wheels of an electric vehicle. The shell of the oil-cooled motor is used for fixing and accommodating a motor stator and an oil injection ring of the oil-cooled motor. A stator iron core of the motor stator and the oil injection ring are adjacently arranged in the axial direction of the oil-cooled motor, and the end portion of the stator winding is exposed out of the stator iron core and surrounded by the oil injection ring. Each through hole in the multiple through holes of the oil injection ring is used for communicating the inner circumferential face and the outer circumferential face of the oil injection ring. Each through hole in the axial direction of the oil cooling motor is closer to the stator iron core than an annular protrusion on the outer circumferential face of the oil injection ring, the annular protrusions are used for fixing a plurality of axial protrusions arranged in the circumferential direction of the oil injection ring at intervals, and the axial protrusions are used for abutting against the inner circumferential face of the shell to fix the oil injection ring. One end of each axial protrusion is fixed to the annular protrusion, the other end of each axial protrusion protrudes out of the annular protrusion in the axial direction of the oil cooling motor, and the other end of each axial protrusion is farther from the central axis of the oil injection ring than one end of each axial protrusion in the radial direction of the oil injection ring.

Description

Technical Field

[0001] The present application relates to the field of electric vehicles, and in particular to an oil-cooled motor and an oil-cooled powertrain. Background Art

[0002] Drive motors have been widely used in electric vehicles in recent years, and their heat dissipation is a key parameter for evaluating their overall performance. Heat generated by the stator windings in the drive motors is the primary heat source. To improve the heat dissipation of the stator windings, one approach is to install an oil spray ring between the stator core and the end cap of the drive motor. This allows lubricating oil within the motor's casing to be sprayed through the oil holes in the oil spray ring onto the stator windings, cooling them.

[0003] However, the structure and fixing method of the existing oil injection ring are relatively complicated, which increases the manufacturing cost of the drive motor. Utility Model Content

[0004] The present application provides an oil-cooled motor and an oil-cooled powertrain. The structure and fixing method of the oil injection ring in the oil-cooled motor are relatively simple, and the oil injection ring has many application scenarios, thereby reducing the manufacturing cost of the drive motor and powertrain.

[0005] An embodiment of the present application provides an oil-cooled motor for driving the wheels of an electric vehicle. The housing of the oil-cooled motor is used to fix and accommodate the motor stator and an oil spray ring of the oil-cooled motor. The stator core of the motor stator and the oil spray ring are arranged adjacent to each other along the axial direction of the oil-cooled motor. The end of the stator winding of the motor stator is exposed from the stator core, and the oil spray ring surrounds the end of the stator winding of the motor stator. An oil spray ring includes a plurality of through holes, each of which is used to connect the inner circumference and outer circumference of an oil spray ring. In addition, the outer circumference of an oil spray ring includes an annular protrusion. The distance between each through hole and the stator core along the axial direction of the oil-cooled motor is less than the distance between an annular protrusion and the stator core. An annular protrusion is used to fix multiple axial protrusions. The multiple axial protrusions are arranged at intervals along the circumference of an oil spray ring. The multiple axial protrusions are used to respectively abut the inner circumference of the housing to fix an oil spray ring. One end of each axial protrusion is fixed to an annular protrusion, and the other end of each axial protrusion protrudes from an annular protrusion along the axial direction of the oil-cooled motor. Along the radial direction of an oil injection ring, the distance between the other end of each axial protrusion and the central axis of an oil injection ring is greater than the distance between one end of each axial protrusion and the central axis of an oil injection ring.

[0006] In the oil-cooled motor provided in the embodiments of the present application, an annular protrusion is provided on the outer circumference of the oil-cooled motor, and multiple outward-expanding axial protrusions are fixedly provided on the annular protrusion. The oil-cooled motor ring does not need to rely on other components of the oil-cooled motor. The multiple axial protrusions of the annular protrusion abut the inner circumference of the oil-cooled motor housing, thereby achieving the axial fixation of the oil-cooled motor itself. As a result, the structural design and fixing method of the oil-cooled motor ring are relatively simple. In addition, the multiple outward-expanding axial protrusions do not occupy the inner space of the oil-cooled motor ring and do not affect other components within the inner space of the oil-cooled motor ring, such as the gear transmission system of the motor shaft of the oil-cooled motor or the layout of the stator winding. This increases the application scenarios of the oil-cooled motor ring. In addition, the manufacturing cost of the oil-cooled motor is reduced.

[0007] In one implementation, along the radial direction of an oil injection ring, the thickness of one end of each axial protrusion is smaller than the thickness of the other end.

[0008] The thickness of one end of each axial protrusion is processed to be thinner than the thickness of the other end of each axial protrusion along the radial direction of an oil injection ring, so that the other end of each axial protrusion abuts the inner circumferential surface of the shell to fix the oil injection ring, thereby simplifying the processing technology of the oil injection ring.

[0009] In one implementation, the outer peripheral surface of an oil injection ring further includes another annular protrusion, and a plurality of through holes are distributed between the another annular protrusion and the one annular protrusion along the axial direction of the oil-cooled motor.

[0010] Another annular protrusion is machined on the outer circumference of the oil spray ring, and the other annular protrusion is machined on the side of the through hole away from the one annular protrusion, so that the groove between the other annular protrusion and the one annular protrusion can collect coolant, ensuring that a sufficient amount of coolant flows into the through hole and sprays on the end of the stator winding, thereby improving the cooling effect of the stator winding and further improving the performance of the oil-cooled motor, such as high torque density and high power density.

[0011] In addition, an annular protrusion not only serves as a component for fixing the axial protrusion, but also serves as a component for forming a groove wall between another annular protrusion and an annular protrusion. Therefore, the injection ring reuses the structure of an annular protrusion, which can reduce the axial size of the injection ring along the oil-cooled motor.

[0012] In one implementation, the outer peripheral surface of an oil injection ring further includes another annular protrusion, and the another annular protrusion and the one annular protrusion are arranged at intervals along the axial direction of the oil-cooled motor and arranged on the same side of multiple through holes, and the distance between each through hole and the another annular protrusion along the axial direction of the oil-cooled motor is smaller than the distance between each through hole and the one annular protrusion, and the gap between the another annular protrusion and the one annular protrusion is used to accommodate an annular seal.

[0013] Another annular protrusion is machined on the outer circumferential surface of the oil spray ring, and another annular protrusion is machined between the through hole and an annular protrusion, and an annular seal is provided in the gap between the another annular protrusion and an annular protrusion, thereby reducing the coolant flowing out along the gap between the inner circumferential surface of the housing of the oil-cooled motor and the oil spray ring, allowing more coolant to flow into the through hole and spray into the end of the stator winding, thereby improving the cooling effect of the stator winding, and further improving the performance of the oil-cooled motor such as high torque density and high power density.

[0014] An annular protrusion not only serves as a component for fixing the axial protrusion, but also serves as a component of a groove wall of a groove for accommodating an annular seal. Therefore, the injection ring reuses an annular protrusion structure, which can reduce the axial size of the injection ring along the oil-cooled motor.

[0015] In addition, due to the presence of another annular protrusion, the axial size of the groove for collecting coolant along the oil-cooled motor is reduced from the spacing between another annular protrusion and one annular protrusion to the spacing between another annular protrusion and another annular protrusion, thereby reducing the coolant retained in the groove, further improving the cooling effect of the stator winding, and further improving the performance of the oil-cooled motor such as high torque density and high power density.

[0016] In one implementation, the outer diameter of the further annular protrusion is smaller than the outer diameter of the one annular protrusion, and the outer diameter of the one annular seal is larger than the outer diameter of the one annular protrusion.

[0017] The other annular protrusion is closer to the stator core than the first annular protrusion, and the outer diameter of the other annular protrusion is set smaller than the outer diameter of the first annular protrusion, thereby increasing the contact area between the coolant and the annular seal between the other annular protrusion and the first annular protrusion, thereby preventing the coolant from scouring the annular seal and causing the annular seal to become skewed.

[0018] In one implementation, an oil injection ring further includes an annular receiving groove, a notch of which faces the stator core along the axial direction of the oil-cooled motor, and the annular receiving groove is used to fix another annular seal.

[0019] An annular receiving groove with a notch facing the stator core is machined on the oil spray ring, and an annular seal is embedded in the annular receiving groove, thereby reducing the coolant flowing out along the gap between the stator core and the oil spray ring, allowing more coolant to flow into the through hole and spray onto the end of the stator winding, thereby improving the cooling effect of the stator winding and further improving the performance of the oil-cooled motor, such as high torque density and high power density.

[0020] In one implementation, an annular accommodating groove includes two radial groove walls, one of the two radial groove walls surrounds the other radial groove wall, and the distance between one radial groove wall and the stator core along the axial direction of the oil-cooled motor is greater than the distance between the other radial groove wall and the stator core.

[0021] One slot wall of the annular receiving groove is closer to the outer peripheral surface of the stator core than the other slot wall, and the distance between one slot wall and the stator core is set to be larger than the distance between the other slot wall and the stator core, thereby increasing the contact area between the coolant and the annular seal in the annular receiving groove, thereby preventing the coolant from scouring the annular seal and causing the annular seal to become skewed.

[0022] In one implementation, another annular seal is arranged between the stator core and an oil injection ring along the axial direction of the oil-cooled motor. The another annular seal includes an annular groove, the notch of which faces the oil injection ring along the axial direction of the annular groove. The annular groove includes two abutting groove walls, one of which surrounds the other abutting groove wall, one of which is configured to abut the outer circumferential surface of the oil injection ring, and the other abutting groove wall is configured to abut the inner circumferential surface of the oil injection ring.

[0023] An annular groove with a notch facing the oil spray ring is machined on the annular seal, and the oil spray ring is embedded in the annular groove, thereby reducing the coolant flowing out along the gap between the stator core and the oil spray ring, allowing more coolant to flow into the through hole and spray onto the end of the stator winding, thereby improving the cooling effect of the stator winding and further improving the performance of the oil-cooled motor, such as high torque density and high power density.

[0024] In one implementation, the inner circumferential surface of the housing includes a plurality of grooves, each groove being used to accommodate the other end of an axial protrusion.

[0025] A plurality of grooves are machined on the inner circumference of the shell, so that the other end of each axial protrusion is embedded in a groove, which not only fixes the oil injection ring itself along the axial direction of the oil-cooled motor, but also fixes the oil injection ring itself along the radial direction of the oil-cooled motor.

[0026] In one implementation, a plurality of grooves are connected along the circumference of the oil-cooled motor to form an annular connecting groove.

[0027] An annular connecting groove is machined on the inner circumference of the housing as a groove for embedding the other end of each axial protrusion, thereby simplifying not only the processing technology of the oil-cooled motor, but also the assembly technology of the oil injection ring and the housing of the oil-cooled motor.

[0028] In one implementation, an annular connecting groove includes two axial groove walls arranged opposite each other along the axial direction of the oil-cooled motor. The spacing between the two axial groove walls gradually decreases in the direction away from the central axis of an oil injection ring in the radial direction of the oil-cooled motor. This not only facilitates the axial installation of the oil injection ring into the motor housing, but also prevents the oil injection ring from backing out once installed, thereby improving the reliability of the oil injection ring structure.

[0029] In one implementation, an annular protrusion is also used to fix a radial protrusion. Along the circumference of an oil injection ring, a radial protrusion is arranged between two axial protrusions. Along the radial direction of an oil injection ring, a radial protrusion protrudes from the outer peripheral surface of an annular protrusion.

[0030] The radial protrusions help position the oil spray ring during installation into the oil-cooled motor housing, improving its efficiency. Furthermore, once assembled, the radial protrusions prevent the ring from rotating radially around the motor, improving its structural reliability.

[0031] In one implementation, the thickness of the other end of each axial protrusion increases and then decreases in the radial direction of the oil spray ring, away from the central axis of the oil spray ring. This not only facilitates the axial installation of the oil spray ring into the housing of the oil-cooled motor, but also prevents the oil spray ring from sliding back once installed, thereby improving the reliability of the oil spray ring structure.

[0032] In one implementation, the circumferential dimension of each axial protrusion along the oil injection ring is greater than its radial dimension along the oil injection ring. This increases the contact area between each axial protrusion and the inner circumferential surface of the oil-cooled motor housing along the circumferential direction of the oil injection ring, thereby improving the securement between the oil injection ring and the oil-cooled motor housing.

[0033] In one implementation, multiple axial protrusions and multiple through holes are distributed on both sides of an annular protrusion along the axial direction of the oil-cooled motor. Thus, the layout of the axial protrusions on the oil spray ring does not affect the flow of coolant or the layout of other components on the outer circumference of the oil spray ring.

[0034] In a second aspect, an oil-cooled powertrain is provided, which includes a reducer and an oil-cooled motor as described in the first aspect and any one of the implementations of the first aspect, wherein the motor shaft of the oil-cooled motor is used for transmission connection to the input shaft of the reducer.

[0035] The oil-cooled motor provided in the embodiments of the present application has a low manufacturing cost, which helps reduce the manufacturing cost of the oil-cooled powertrain. In addition, the oil-cooled motor provided in the embodiments of the present application has improved performance, such as high torque density and high power density, which helps improve the power performance of the oil-cooled powertrain.

[0036] In a third aspect, an electric vehicle is provided, comprising wheels, a transmission mechanism, and the oil-cooled powertrain as described in the second aspect, wherein the oil-cooled powertrain is used to drive the wheels through the transmission mechanism.

[0037] The oil-cooled powertrain provided in the embodiments of the present application has a low manufacturing cost, which is beneficial to reducing the manufacturing cost of electric vehicles. In addition, the oil-cooled powertrain provided in the embodiments of the present application has improved power performance, which is beneficial to improving the power performance of electric vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A schematic diagram of an electric vehicle provided in an embodiment of the present application.

[0039] Figure 2 Another schematic diagram of an electric vehicle provided in an embodiment of the present application.

[0040] Figure 3 A schematic diagram of an oil-cooled motor provided in an embodiment of the present application.

[0041] Figure 4 A schematic diagram of a housing provided in an embodiment of the present application.

[0042] Figure 5 for Figure 4 A schematic diagram of part A of the housing is shown.

[0043] Figure 6 Another schematic diagram of a housing provided in an embodiment of the present application.

[0044] Figure 7 A schematic diagram of the fuel injection ring provided in an embodiment of the present application.

[0045] Figure 8 Another schematic diagram of the fuel injection ring provided in an embodiment of the present application.

[0046] Figure 9 for Figure 7 Schematic diagram of part B of the oil injection ring is shown.

[0047] Figure 10 for Figure 8 Schematic diagram of part C of the oil injection ring is shown.

[0048] Figure 11 Another schematic diagram of the fuel injection ring provided in an embodiment of the present application.

[0049] Figure 12 for Figure 11 Schematic diagram of part D of the oil injection ring is shown.

[0050] Figure 13 Another schematic diagram of an oil-cooled motor provided in an embodiment of the present application.

[0051] Figure 14 Another schematic diagram of the annular seal provided in an embodiment of the present application.

[0052] Figure 15 Another schematic diagram of an oil-cooled motor provided in an embodiment of the present application.

[0053] Figure 16 and Figure 17 Each of them is another schematic diagram of the oil-cooled motor provided in an embodiment of the present application. DETAILED DESCRIPTION

[0054] The technical solution in this application will be described below with reference to the accompanying drawings.

[0055] The terms "equal" and "equal to" used in this application are not strictly equal, but rather fall within an acceptable error range. The terms "parallel" and "perpendicular" are not strictly parallel, but rather fall within an acceptable error range. The terms "perpendicular" and "perpendicular" are not strictly perpendicular, but rather fall within an acceptable error range.

[0056] In the embodiments of this application, the same reference numerals represent the same component or part. In the embodiments of this application, for multiple identical parts, only one of the parts may be labeled with a reference numeral in the drawings as an example. The same reference numerals apply to other identical parts or components. In addition, the sizes and dimensions of the parts shown in the drawings are for illustrative purposes only.

[0057] Figure 1 A schematic diagram of an electric vehicle provided in an embodiment of the present application. Figure 1 As shown, the electric vehicle 1 includes one or more oil-cooled powertrains 10, a power battery 20, and wheels 30. In one embodiment, the oil-cooled powertrain 10 is used to receive power from the power battery 20 and convert electrical energy into mechanical energy to drive the wheels 30 to rotate.

[0058] The electric vehicles provided in the embodiments of the present application include pure electric vehicles, hybrid electric vehicles, extended-range electric vehicles, plug-in hybrid electric vehicles or new energy vehicles, etc. Among them, pure electric vehicles are also called pure electric vehicle / battery electric vehicle, or simply pure EV / battery EV. Hybrid electric vehicles are also called hybrid electric vehicles, or simply HEV. Extended-range electric vehicles are also called range extended electric vehicles, or simply REEV. Plug-in hybrid electric vehicles are also called plug-in hybrid electric vehicles, or simply PHEV. New energy vehicles are also called new energy vehicles, or simply NEV.

[0059] Figure 2 Another schematic diagram of an electric vehicle provided in an embodiment of the present application. Figure 2 As shown, in addition to the oil-cooled powertrain 10, power battery 20, and wheels 30 described above, electric vehicle 2 also includes a power module 40. Power module 40 is configured to receive power from an external power source 50 to charge power battery 20. In one embodiment, external power source 50 is an AC power grid, an AC charging station, or a DC charging station. Power module 40 includes at least one of a DC charger and an AC charger.

[0060] In one embodiment, the oil-cooled powertrain 10 includes an oil-cooled motor 100 and a motor controller 200. In one embodiment, the oil-cooled powertrain 10 includes an oil-cooled motor 100, a motor controller 200, and a reducer 300. In one embodiment, the oil-cooled powertrain 10 includes an oil-cooled motor 100 and a reducer 300.

[0061] like Figure 2 As shown, the motor controller 200 is used to receive the DC power output by the power battery 20 and convert the DC power output by the power battery 20 into AC power to control the oil-cooled motor 100 to drive the wheels 30 of the electric vehicle 2 through the reducer 300.

[0062] Figure 3 A schematic diagram of an oil-cooled motor provided in an embodiment of the present application. The oil-cooled motor 100 includes: Figure 3 The housing 110 shown in FIG. Figure 3 The motor stator 120, the motor rotor, the motor shaft and the Figure 3 The fuel injection ring 130 is shown.

[0063] The housing 110 houses the various components of the oil-cooled motor 100. Specifically, the housing 110 houses the motor stator 120 and the oil injection ring 130. The motor stator 120 houses the motor rotor, which is connected to the motor shaft. When the motor controller 200 controls the operation of the oil-cooled motor 100, the motor rotor rotates relative to the motor stator 120, driving the rotation of the motor shaft.

[0064] Furthermore, the housing 110 is used to secure the motor stator 120 and the oil spray ring 130. In one embodiment, the diameter of the inner circumferential surface S of the housing 110 along the radial direction of the oil-cooled motor 100 is equal to the diameter of the motor stator 120. The diameter of the inner circumferential surface S of the housing 110 along the radial direction of the oil-cooled motor 100 is also equal to the maximum outer diameter of the oil spray ring 130.

[0065] In the embodiment of the present application, the radial direction of the oil-cooled motor 100 can be understood as the radial direction of the motor stator 120 in the oil-cooled motor 100, the radial direction of the motor rotor in the oil-cooled motor 100, the radial direction of the motor shaft in the oil-cooled motor 100, the radial direction of the stator core 121, the radial direction of the oil injection ring 130, the radial direction of the annular seal 140, and the radial direction of the annular seal 150.

[0066] In some embodiments, the oil-cooled motor 100 and the oil-cooled powertrain 10 share a housing, that is, the housing 110 of the oil-cooled motor 100 serves as the housing of the oil-cooled powertrain 10. In one embodiment, the housing 110 includes a motor cavity and a motor controller cavity. The motor cavity of the housing 110 is used to accommodate the various components of the oil-cooled motor 100, and the motor controller cavity of the housing 110 is used to accommodate the various components of the motor controller 200. In one embodiment, the housing 110 includes a motor cavity, a motor controller cavity, and a reducer accommodating cavity. The motor cavity of the housing 110 is used to accommodate the various components of the oil-cooled motor 100, the motor controller cavity of the housing 110 is used to accommodate the various components of the motor controller 200, and the reducer accommodating cavity of the housing 110 is used to accommodate the various components of the reducer 300. In one embodiment, the housing 110 includes a motor cavity 410 and a reducer accommodating cavity. The motor cavity of the housing 110 is used to accommodate the various components of the oil-cooled motor 100, and the reducer accommodating cavity of the housing 110 is used to accommodate the various components of the reducer 300. The inner wall of the motor cavity of the housing 110 is the inner circumferential surface S of the housing 110 .

[0067] Figure 4 A schematic diagram of a housing provided in an embodiment of the present application. Figure 5 for Figure 4 A schematic diagram of part A of the shell shown in FIG. Figure 4 and Figure 5 As shown, the housing 110 includes an opening H, and the opening H of the housing 110 is oriented parallel to the axial direction of the oil-cooled motor 100 .

[0068] In the embodiment of the present application, the axial direction of the oil-cooled motor 100 can be understood as the axial direction of the motor stator 120 in the oil-cooled motor 100, the axial direction of the motor rotor in the oil-cooled motor 100, the axial direction of the motor shaft in the oil-cooled motor 100, the axial direction of the stator core 121, the axial direction of the oil injection ring 130, the axial direction of the annular seal 140, and the axial direction of the annular seal 150.

[0069] In one embodiment, Figure 4 and Figure 5 As shown, the inner circumferential surface S of the housing 110 includes an axial groove G11, which communicates with the opening H of the housing 110 and is adapted to engage the radial protrusion P12 of the oil injection ring 130. Thus, the axial groove G11 of the inner circumferential surface S of the housing 110 serves as a positioning reference. The radial protrusion P12 of the oil injection ring 130 is aligned with the axial groove G11 of the inner circumferential surface S of the housing 110, allowing the oil injection ring 130 to be installed into the housing 110 along the axial direction of the oil-cooled motor 100. This simplifies the installation process of the oil injection ring 130 and improves its assembly efficiency.

[0070] In one embodiment, the extending direction of the axial groove G11 is parallel to the axial direction of the oil-cooled motor 100. In one embodiment, the width of the axial groove G11 along the circumferential direction of the oil-cooled motor 100 decreases along the axial direction of the oil-cooled motor 100 away from the opening H of the housing 110. Figure 4 and Figure 5 As shown, the width W1 of the portion of the axial groove G11 near the opening H of the housing 110 along the circumferential direction of the oil-cooled motor 100 is greater than the width W2 of the portion of the axial groove G11 away from the opening H of the housing 110 along the circumferential direction of the oil-cooled motor 100. Consequently, when the oil spray ring 130 is installed into the housing 110 along the axial direction of the oil-cooled motor 100, the radial protrusion P12 of the oil spray ring 130 along the axial direction of the oil-cooled motor 100 can be easily pushed into the axial groove G11 on the inner circumferential surface S of the housing 110, thereby improving the assembly efficiency of the oil spray ring 130.

[0071] In the embodiment of the present application, the circumferential direction of the oil-cooled motor 100 can be understood as the circumferential direction of the motor stator 120 in the oil-cooled motor 100, the circumferential direction of the motor rotor in the oil-cooled motor 100, the circumferential direction of the motor shaft in the oil-cooled motor 100, the circumferential direction of the stator core 121, the circumferential direction of the oil injection ring 130, the circumferential direction of the annular seal 140, and the circumferential direction of the annular seal 150. The circumferential direction can be understood as the circumferential direction.

[0072] In one embodiment, the inner circumferential surface S of the housing 110 further includes a plurality of grooves. These grooves are spaced apart along the circumference of the oil-cooled motor 100, and each groove is configured to accommodate the other end of an axial protrusion P11 of the oil spray ring 130. Thus, along the circumference of the oil-cooled motor 100, the other end of each axial protrusion P11 of the oil spray ring 130 is engaged with a groove on the inner circumferential surface S of the housing 110, preventing the oil spray ring 130 from moving circumferentially and axially of the oil-cooled motor 100 and enhancing the secure connection between the oil spray ring 130 and the housing 110.

[0073] In one embodiment, the plurality of grooves on the inner circumferential surface S of the housing 110 are connected along the circumferential direction of the oil-cooled motor 100 to form a Figure 4 or Figure 5 The annular communicating groove G12 is shown, thereby simplifying the processing technology of the multiple grooves on the inner peripheral surface S of the housing 110.

[0074] In one embodiment, the distance between the axial annular connecting groove G12 of the oil-cooled motor 100 and the opening H of the housing 110 is less than the length of the axial groove G11. Figure 4 and Figure 5 As shown, along the axial direction of the oil-cooled motor 100 , the axial groove G11 passes through the annular communicating groove G12 .

[0075] Figure 6 Another schematic diagram of a housing provided in an embodiment of the present application. In one embodiment, as Figure 6 As shown, the annular connecting groove G12 includes two axial groove walls R1~R2 arranged opposite to each other along the axial direction of the oil-cooled motor 100, and the distance between the two axial groove walls R1~R2 gradually decreases along the radial direction of the oil-cooled motor 100 away from the central axis of the inner circumferential surface S of the shell 110.

[0076] In the embodiment of the present application, the central axis S of the inner circumferential surface of the shell 110 can be understood as the central axis of the motor stator 120 in the oil-cooled motor 100, the central axis of the motor rotor in the oil-cooled motor 100, the central axis of the motor shaft in the oil-cooled motor 100, the central axis of the stator core 121, the central axis of the oil injection ring 130, the central axis of the annular seal 140 or the central axis of the annular seal 150.

[0077] In one embodiment, Figure 6 As shown, the groove wall R1 of the annular connecting groove G12 is farther away from the opening H of the shell 110 than the groove wall R2, and the angle α between the groove wall R1 of the annular connecting groove G12 and the axial direction of the oil-cooled motor 100 is smaller than the angle β between the groove wall R2 of the annular connecting groove G12 and the axial direction of the oil-cooled motor 100.

[0078] In one embodiment, Figure 4 and Figure 5As shown, the inner circumference S of the housing 110 further includes an annular groove G13 for accommodating the annular seal 140. The annular groove G13 is arranged on the side of the annular connecting groove G12 away from the opening H of the housing 110 along the axial direction of the oil-cooled motor 100.

[0079] In one embodiment, Figure 5 and Figure 6 As shown, there is a gap between the annular groove G13 and the axial groove G11 along the axial direction of the oil-cooled motor 100. Thus, the annular groove G13 avoids the axial groove G11, thereby preventing the annular seal 140 of the annular groove G13 from being squeezed due to the existence of the axial groove G11.

[0080] like Figure 3 As shown, the motor stator 120 includes a stator core 121 and a stator winding 122. The stator core 121 includes a plurality of winding slots, which penetrate the stator core 121 along the axial direction of the oil-cooled motor 100. The plurality of winding slots are arranged at intervals along the circumferential direction of the oil-cooled motor 100. Each winding slot is connected to the inner circumference of the stator core 121. The stator winding 122 passes through the plurality of winding slots and is wound around the stator core 121. Figure 3 As shown, two ends of the stator winding 122 are exposed from the stator core 121 along the axial direction of the oil-cooled motor 100. The stator winding 122 is used to receive the alternating current provided by the motor controller 200.

[0081] In one embodiment, the outer circumferential surface of the stator core 121 includes a plurality of axial oil passage grooves, which are arranged at intervals along the circumference of the oil-cooled motor 100. Each axial oil passage groove extends through the stator core 121 in the axial direction of the oil-cooled motor 100. Each axial oil passage groove is used to connect to the oil passage of the housing 110.

[0082] The oil spray ring 130 surrounds the ends of the stator winding 122 of the motor stator 120. In one embodiment, there is one oil spray ring 130, which surrounds one of the two ends of the stator winding 122 of the motor stator 120 along the circumference of the oil-cooled motor 100. In another embodiment, there are two oil spray rings 130, which are distributed on both sides of the stator core 121 along the axial direction of the oil-cooled motor 100. Along the circumference of the oil-cooled motor 100, one oil spray ring 130 surrounds one of the two ends of the stator winding 122 of the motor stator 120, and the other oil spray ring 130 surrounds the other of the two ends of the stator winding 122 of the motor stator 120.

[0083] Figure 7 A schematic diagram of the fuel injection ring provided in an embodiment of the present application. Figure 8 Another schematic diagram of the fuel injection ring provided in the embodiment of the present application. Figure 7 and Figure 8 As shown, the oil injection ring 130 includes an inner circumferential surface S1 and an outer circumferential surface S2 , and the inner circumferential surface S1 and the outer circumferential surface S2 are arranged opposite to each other in the radial direction of the oil-cooled motor 100 .

[0084] like Figure 7 and Figure 8 As shown, the oil spray ring 130 further includes a plurality of through holes T, each of which is used to connect the inner circumferential surface S1 and the outer circumferential surface S2 of the oil spray ring 130. Consequently, coolant in each axial oil channel groove on the outer circumferential surface of the stator core 121 flows through the gap between the oil spray ring 130 and the housing 110 into the through holes T and is sprayed onto the ends of the stator winding 122, thereby cooling the stator winding 122.

[0085] In one embodiment, each through hole T passes through the inner circumferential surface S1 and the outer circumferential surface S2 of the oil injection ring 130 along the radial direction of the oil-cooled motor 100 , thereby simplifying the processing technology of each through hole T.

[0086] In one embodiment, Figure 7 As shown, multiple through holes T are arranged at intervals along the circumference of the oil-cooled motor 100. The angle θ occupied by all through holes T along the circumference of the oil-cooled motor 100 ranges from 180 degrees to 330 degrees. That is, through holes T are arranged on the oil spray ring 130 within the range of 180 degrees to 330 degrees along the circumference of the oil-cooled motor 100. Therefore, when the oil spray ring 130 is installed into the housing 110 from one side of the opening H of the housing 110 along the axial direction of the oil-cooled motor 100, all through holes T of the oil spray ring 130 are arranged upward in the direction of gravity. This prevents excessive coolant from being distributed at the bottom of the housing 110 due to gravity, improves the cooling effect of the stator winding 122, and further enhances the performance of the oil-cooled motor 100, such as high torque density and high power density.

[0087] In one embodiment, multiple through holes T are arranged at equal intervals along the circumference of the oil-cooled motor 100. This allows the coolant to be evenly sprayed onto the ends of the stator windings 122, improving the cooling effect of the stator windings 122 and further enhancing the performance of the oil-cooled motor 100, such as high torque density and high power density.

[0088] like Figure 7 and Figure 8 As shown, the outer circumferential surface S2 of the oil injection ring 130 further includes an annular protrusion P1, which protrudes from the outer circumferential surface S2 of the oil injection ring 130 toward the outside of the oil injection ring 130. Along the axial direction of the oil-cooled motor 100, the distance between each through hole T and the stator core 121 is smaller than the distance between the annular protrusion P1 and the stator core 121. That is, each through hole T is closer to the stator core 121 than the annular protrusion P1.

[0089] In one embodiment, the outer diameter of the annular protrusion P1 along the radial direction of the oil-cooled motor 100 is equal to the diameter of the inner circumferential surface S of the housing 110. In this way, the annular protrusion P1 can block some coolant from flowing out through the gap between the annular protrusion P and the inner circumferential surface S of the housing 110.

[0090] like Figure 7 and Figure 8 As shown, the annular protrusion P1 is used to fix multiple axial protrusions P11. These multiple axial protrusions P11 are arranged at intervals along the circumference of the oil-cooled motor 100. These multiple axial protrusions P11 are used to respectively abut the inner circumferential surface S of the housing 110 to fix the oil spray ring 130. As a result, the oil spray ring 130 does not rely on other components of the oil-cooled motor 100. The multiple axial protrusions P1 of the annular protrusion P11 abut the inner circumferential surface S of the housing 110 of the oil-cooled motor 100, thereby securing the oil spray ring 130 axially in the oil-cooled motor 100. This simplifies the structural design and fixing method of the oil spray ring 130, thereby reducing the manufacturing cost of the oil-cooled motor 100.

[0091] One end of each axial protrusion P11 is fixed to the annular protrusion P1, and the other end of each axial protrusion P11 protrudes from the annular protrusion P1 along the axial direction of the oil-cooled motor 100. Along the radial direction of the oil-cooled motor 100, the distance between the other end of each axial protrusion P11 and the central axis of the oil injection ring 130 is greater than the distance between one end of each axial protrusion P11 and the central axis of the oil injection ring 130.

[0092] In other words, each axial protrusion P11 expands outward along the axial direction of the oil-cooled motor 100, away from the stator core 121. Consequently, these multiple axial protrusions P11 do not occupy the space inside the oil spray ring 130, nor do they affect the layout of other components within the space inside the oil spray ring 130, such as the gear transmission system of the motor shaft of the oil-cooled motor 100 or the stator winding 122. This increases the number of scenarios in which the oil spray ring 130 can be used in oil-cooled motors 100, thereby reducing the manufacturing cost of the oil-cooled motor 100.

[0093] In one embodiment, the other end of each axial protrusion P11 is configured to be received in one of the plurality of grooves in the inner circumferential surface S of the housing 110. Thus, along the circumference of the oil-cooled motor 100, the other end of each axial protrusion P11 of the oil-spray ring 130 is engaged with a groove in the inner circumferential surface S of the housing 110, preventing the oil-spray ring 130 from moving in the circumferential and radial directions of the oil-cooled motor 100 and enhancing the securement between the oil-spray ring 130 and the housing 110.

[0094] In one embodiment, the other end of each axial protrusion P11 is received in an annular connecting groove G12 formed by a plurality of grooves in the inner circumferential surface S of the housing 110. Thus, along the circumference of the oil-cooled motor 100, the other end of each axial protrusion P11 of the oil-injection ring 130 is engaged with the annular connecting groove G12 in the inner circumferential surface S of the housing 110. This not only prevents the oil-injection ring 130 from moving radially along the oil-cooled motor 100, thereby increasing the securement between the oil-injection ring 130 and the housing 110, but also simplifies the assembly process of the oil-injection ring 130.

[0095] Figure 9 for Figure 7 Schematic diagram of part B of the oil injection ring shown in FIG. Figure 9 As shown, the thickness H1 of one end of each axial protrusion P11 is smaller than the thickness H2 of the other end in the radial direction of the oil-cooled motor 100. The thickness of one end of each axial protrusion P11 is machined to be slightly thinner than the thickness of the other end of each axial protrusion P11 in the radial direction of the oil-cooled motor 100. This allows the other end of each axial protrusion P11 to abut the inner circumferential surface S of the housing 110, thereby securing the oil injection ring 130 and simplifying the machining process of the oil injection ring 130.

[0096] In one embodiment, Figure 9 As shown, the thickness of the other end of each axial protrusion P1 first increases and then decreases in the direction away from the central axis of the oil-cooled motor 100 in the radial direction of the oil-cooled motor 100. This not only facilitates the installation of the oil-cooled motor 100 into the housing 110 of the oil-cooled motor 100 along the axial direction of the oil-cooled motor 100, but also prevents the oil-cooled motor 130 from sliding back once installed in the housing 110 of the oil-cooled motor 100, thereby improving the structural reliability of the oil-cooled motor 130.

[0097] In one embodiment, Figure 9 As shown, each axial protrusion P11 includes two surfaces E1 and E2, arranged radially away from the central axis of the oil-cooled motor 100. Surfaces E1 and E2 are arranged radially opposite to each other in the oil-cooled motor 100. Surface E1 includes three sections, E11 to E13, which are connected in sequence in the direction of the oil-cooled motor 100's axial direction away from the stator core 121. Surfaces E12 and E13 are surfaces at the other end of axial protrusion P11. Surfaces E11 and E12 each form an angle with the axial direction of the oil-cooled motor 100, resulting in the thickness of each axial protrusion P1 at the other end increasing and then decreasing in the direction of the oil-cooled motor 100's radial direction away from the central axis of the oil-cooled motor 100.

[0098] In one embodiment, the angle between the surface E11 of the axial protrusion P11 and the axial direction of the oil-cooled motor 100 is approximately α, and the angle between the surface E12 of the axial protrusion P11 and the axial direction of the oil-cooled motor 100 is approximately β. Consequently, when the oil injection ring 130 is installed into the housing 110 of the oil-cooled motor 100 along the axial direction of the oil-cooled motor 100, the contact area between the surface E11 and the groove wall R1 of the annular connecting groove G12 and the contact area between the surface E12 and the groove wall R2 of the annular connecting groove G12 are maximized, thereby improving the securement between the oil injection ring 130 and the housing 110 of the oil-cooled motor 100.

[0099] Furthermore, because α is smaller than β, a smaller α relative to β facilitates the installation of the oil spray ring 130 into the housing 110 of the oil-cooled motor 100 along the axial direction of the oil-cooled motor 100. A larger β relative to α prevents the oil spray ring 130 from retracting after being installed into the housing 110 of the oil-cooled motor 100, thereby improving the structural reliability of the oil spray ring 130.

[0100] In one embodiment, Figure 9 As shown, the dimension of each axial protrusion P11 along the circumferential direction of the oil-cooled motor 100 is greater than the dimension of each axial protrusion P11 along the radial direction of the oil-cooled motor 100. This increases the contact area between each axial protrusion P11 and the inner circumferential surface S of the housing 110 of the oil-cooled motor 100 along the circumferential direction of the oil-cooled motor 100, thereby improving the firmness between the oil injection ring 130 and the housing 110 of the oil-cooled motor 100.

[0101] In one embodiment, Figure 7 and Figure 8 As shown, multiple axial protrusions P11 and multiple through holes T are distributed on both sides of the annular protrusion P1 along the axial direction of the oil-cooled motor 100. Therefore, the layout of the axial protrusions P11 on the oil spray ring 130 does not affect the flow of coolant, nor does it affect the layout of other components on the outer peripheral surface S2 of the oil spray ring 130.

[0102] In one embodiment, Figure 7 and Figure 8 As shown, the annular protrusion P1 is also used to fix a radial protrusion P12, and the radial protrusion P12 is arranged between the two axial protrusions P11 along the circumference of the oil-cooled motor 100. Figure 8 As shown, along the radial direction of the oil-cooled motor 100 , the radial protrusion P12 protrudes from the outer circumferential surface of the annular protrusion P1 .

[0103] Combine Figure 5 、 Figure 7 and Figure 8The radial protrusion P12 is designed to engage with the axial groove G11 in the inner circumferential surface S of the housing 110. During the installation of the oil injection ring 130 into the housing 110 of the oil-cooled motor 100, the radial protrusion P12 serves as a positioning reference, thereby improving the assembly efficiency of the oil injection ring 130. Furthermore, after the oil injection ring 130 is assembled, the radial protrusion P12 prevents the oil injection ring 130 from rotating radially relative to the oil-cooled motor 100, thereby improving the structural reliability of the oil injection ring 130.

[0104] In one embodiment, Figure 7 and Figure 8 As shown, the outer peripheral surface S2 of the oil spray ring 130 also includes another annular protrusion P2. Multiple through-holes T are distributed along the axial direction of the oil-cooled motor 100 between the annular protrusion P2 and the annular protrusion P1. Thus, the groove formed between the annular protrusion P2 and the annular protrusion P1 can collect coolant, ensuring that a sufficient amount of coolant flows into the through-holes T and is sprayed onto the ends of the stator winding 122. This improves the cooling effect of the stator winding 122 and, in turn, enhances the performance of the oil-cooled motor 100, such as high torque density and high power density. Furthermore, the annular protrusion P1 not only serves as a component for fixing the axial protrusion P11 but also as a component forming a groove wall of the groove between the annular protrusion P2 and the annular protrusion P1. As a result, the oil spray ring 130 reuses the structure of the annular protrusion P1, which can reduce the size of the oil spray ring 130 along the axial direction of the oil-cooled motor 100.

[0105] In one embodiment, the outer diameter of the annular protrusion P2 is smaller than the outer diameter of the annular protrusion P1 along the radial direction of the oil-cooled motor 100. Thus, the coolant can easily flow from one side of the annular protrusion P2 into the groove between the annular protrusion P2 and the annular protrusion P1.

[0106] In one embodiment, the annular protrusion P2 is aligned with the end surface of the oil-cooled motor 100 facing the stator core 121 along the axial direction of the oil-cooled motor 100. The annular protrusion P1 is aligned with the end surface of the oil-cooled motor 100 facing away from the stator core 121. This maximizes the width of the groove between the annular protrusion P2 and the annular protrusion P1 along the axial direction of the oil-cooled motor 100, thereby increasing the amount of coolant collected.

[0107] In one embodiment, Figure 3 As shown, the oil-cooled motor 100 further includes an annular seal 140 , which is used to seal the gap between the portion of the multiple through holes T in the oil injection ring 130 away from the stator core 121 and the inner circumferential surface S of the housing 110 of the oil-cooled motor 100 .

[0108] In one embodiment, the outer diameter of the annular seal 140 along the radial direction of the oil-cooled motor 100 is greater than the diameter of the inner circumferential surface S of the housing 110. In this embodiment, the diameter of the inner circumferential surface S of the housing 110 can be understood as the diameter of the inner circumferential surface S of the housing 110 without the groove.

[0109] In one embodiment, the annular seal 140 is configured to be received in the annular groove G13 on the inner circumferential surface S of the housing 110 . In one embodiment, the annular seal 140 is configured to be received in the annular groove on the outer circumferential surface of the oil injection ring 130 .

[0110] In one embodiment, Figure 7 and Figure 8 As shown, the outer circumferential surface S2 of the oil spray ring 130 further includes another annular protrusion P3. The annular protrusion P3 and the annular protrusion P1 are arranged at intervals along the axial direction of the oil-cooled motor 100 and on the same side of the plurality of through holes T. The annular protrusion P3 and the annular protrusion P2 are arranged at intervals along the axial direction of the oil-cooled motor 100 and on both sides of the plurality of through holes T.

[0111] Along the axial direction of the oil-cooled motor 100, the distance between each through-hole T and the annular protrusion P3 is smaller than the distance between each through-hole T and the annular protrusion P1. That is, the annular protrusion P3 is closer to each through-hole T than the annular protrusion P1. An annular groove G21 is formed between the annular protrusion P3 and the annular protrusion P1, and an annular groove G22 is formed between the annular protrusion P3 and the annular protrusion P2. The gap between the annular protrusion P3 and the annular protrusion P1, or the annular groove G21, is used to accommodate the annular seal 140. This reduces the amount of coolant that flows out through the gap between the inner circumferential surface S of the housing 110 of the oil-cooled motor 100 and the oil spray ring 130, allowing more coolant to flow into the through-holes T and spray onto the ends of the stator winding 122, thereby improving the cooling effect on the stator winding 122 and enhancing the performance of the oil-cooled motor 100, such as high torque density and high power density.

[0112] The annular protrusion P2 not only serves as a component for fixing the axial protrusion P11, but also serves as a component of a groove wall of the groove for accommodating the annular seal 140. Therefore, the injection ring 120 reuses the structure of the annular protrusion P2, which can reduce the axial size of the injection ring 130 along the oil-cooled motor 100.

[0113] Furthermore, due to the presence of annular protrusion P3, the groove formed between annular protrusion P2 and annular protrusion P1 includes two sections: one section is formed between annular protrusion P3 and annular protrusion P1, and the other section is formed between annular protrusion P3 and annular protrusion P1. One section of the groove is used to accommodate annular seal 140, and the other section is used to collect coolant. This reduces the axial dimension of the coolant collection groove along the oil-cooled motor 100 from the spacing between annular protrusion P2 and annular protrusion P1 to the spacing between annular protrusion P3 and annular protrusion P1. This reduces the amount of coolant retained in the groove, further improving the cooling effect on the stator winding 122, and thereby further enhancing the performance of the oil-cooled motor 100, such as high torque density and high power density.

[0114] In one embodiment, the outer diameter of annular protrusion P3 is smaller than that of annular protrusion P1, and the outer diameter of annular seal 140 is larger than that of annular protrusion P1. Annular protrusion P3 is closer to stator core 121 than annular protrusion P1. Setting the outer diameter of annular protrusion P3 smaller than that of annular protrusion P1 increases the contact area between the coolant and annular seal 140 between annular protrusions P3 and P1, thereby preventing coolant from eroding annular seal 140 and causing it to tilt.

[0115] In the embodiment of the present application, the outer diameter of the annular protrusion P1 along the radial direction of the oil-cooled motor 100 is equivalent to the maximum outer diameter of the oil injection ring 130 .

[0116] In one embodiment, the oil-cooled motor 100 further includes: Figure 3 Another annular seal 150 is shown. The annular seal 150 is arranged axially between the oil spray ring 130 and the stator core 121 of the oil-cooled motor 100. The annular seal 150 is used to seal the gap between the oil spray ring 130 and the stator core 121 of the oil-cooled motor 100. This reduces the amount of coolant that escapes through the gap between the stator core 121 and the oil spray ring 130, allowing more coolant to flow into the through-holes T and spray onto the ends of the stator windings 122. This improves the cooling effect on the stator windings 122 and, in turn, enhances the performance of the oil-cooled motor 100, such as high torque density and high power density.

[0117] In one embodiment, another annular seal 150 is used to securely connect the oil injection ring 130 .

[0118] Figure 10 for Figure 8 FIG. 1 is a schematic diagram of portion C of the oil injection ring 130 . Figure 11 Another schematic diagram of the fuel injection ring provided in the embodiment of the present application. In one embodiment, as Figure 10 and Figure 11As shown, the oil injection ring 130 further includes an annular receiving groove G23 , the notch of which faces the stator core 121 along the axial direction of the oil-cooled motor 100 , and the annular receiving groove G23 is used to fix the annular seal 150 .

[0119] Figure 12 for Figure 11 Schematic diagram of the D portion of the oil injection ring shown. In one embodiment, as Figure 12 As shown, the annular receiving groove G23 includes two radial groove walls G231-G232, with one radial groove wall G231 surrounding the other radial groove wall G232. Along the axial direction of the oil-cooled motor 100, the distance between the radial groove wall G231 and the stator core 121 is greater than the distance between the radial groove wall G232 and the stator core 121.

[0120] One groove wall G231 of the annular receiving groove G23 is closer to the outer peripheral surface of the stator core 121 than the other groove wall G232. The distance between the groove wall G231 and the stator core 121 in the annular receiving groove G23 is set to be larger than the distance between the other groove wall G232 and the stator core 121, thereby increasing the contact area between the coolant and the annular seal 150 in the annular receiving groove G23, thereby preventing the coolant from eroding the annular seal 150 and causing the annular seal 150 to become skewed.

[0121] Figure 13 A schematic diagram of the annular seal provided in an embodiment of the present application. Figure 14 Another schematic diagram of the annular seal 150 provided in an embodiment of the present application. Figure 15 Another schematic diagram of an oil-cooled motor provided in an embodiment of the present application.

[0122] In one embodiment, Figure 13 and Figure 14 As shown, the annular seal 150 includes an annular groove G31 , which is used to accommodate the oil injection ring 130 .

[0123] like Figures 13 to 15 As shown, the opening of the annular groove G31 faces the oil injection ring 130 along the axial direction of the oil-cooled motor 100. The annular groove G31 includes two abutting groove walls G311 and G312, with one abutting groove wall G311 surrounding the other abutting groove wall G312. The abutting groove wall G311 abuts the outer circumferential surface S2 of the oil injection ring 130, while the abutting groove wall G312 abuts the inner circumferential surface S1 of the oil injection ring. Thus, the annular seal 150 encases the oil injection ring 130.

[0124] In one embodiment, Figure 14 and Figure 15As shown, the thickness of the annular seal 150 increases in the radial direction of the oil-cooled motor 100 in the direction away from the stator core 121 along the axial direction of the oil-cooled motor 100. This reduces the material used for the annular seal 150 and reduces the manufacturing cost of the annular seal 150.

[0125] Figure 16 and Figure 17 Another schematic diagram of the oil-cooled motor provided in the embodiment of the present application is shown. Figure 16 and Figure 17 As shown, the oil injection ring 130 forms a space K with the stator core 121 and the inner circumferential surface S of the housing 110. Due to the presence of the annular seal 140 and the annular seal 150, the space K is a relatively closed space.

[0126] like Figure 16 and Figure 17 As shown, the coolant in the oil channel of the housing 110 of the oil-cooled motor 100 flows into each axial oil channel groove G of the stator core 121, flows into the space K along each axial oil channel groove G of the stator core 121, and is sprayed on the end of the stator winding 122 through the through hole T, thereby cooling the stator winding 122.

[0127] In the oil-cooled motor 100 provided in the embodiment of the present application, the oil injection ring 130 has multiple axial protrusions P1 of the annular protrusion P11 abutting against the inner circumferential surface S of the housing 110 of the oil-cooled motor 100, thereby fixing the oil injection ring 130 itself along the axial direction of the oil-cooled motor 100. As a result, the structural design and fixing method of the oil injection ring 130 are relatively simple. The multiple outward-expanding axial protrusions P11 do not occupy the inner space of the oil injection ring 130 and do not affect other components within the inner space of the oil injection ring 130, such as the gear transmission system of the motor shaft of the oil-cooled motor 100 or the layout of the stator winding 122. This increases the scenarios in which the oil injection ring 130 can be used in the oil-cooled motor 100. In turn, this reduces the manufacturing cost of the oil-cooled motor 100.

[0128] In addition, the space K for coolant flow formed by the oil injection ring 130 , the stator core 121 , and the inner circumferential surface S of the housing 110 is relatively closed, thereby improving the cooling effect of the stator winding 122 in the oil-cooled motor 100 .

[0129] The oil-cooled powertrain 10 provided in the embodiment of the present application includes the oil-cooled motor 100 described above. The oil-cooled motor 100 has a relatively low manufacturing cost, which helps reduce the manufacturing cost of the oil-cooled powertrain 10. Furthermore, due to the excellent sealing effect of the coolant flow space K formed by the oil injection ring 130 in the oil-cooled motor 100, the stator core 121, and the inner circumferential surface S of the housing 110 of the oil-cooled motor 100, the stator winding 122 in the oil-cooled motor 100 is cooled, thereby improving the performance of the oil-cooled motor 100, such as high torque density and high power density, and thus improving the power performance of the oil-cooled powertrain 10.

[0130] The electric vehicle 1 or electric vehicle 2 provided in the embodiments of the present application includes the oil-cooled motor 100 or oil-cooled powertrain 10 described above. The low manufacturing cost of the oil-cooled motor 100 or oil-cooled powertrain 10 can reduce the manufacturing cost of the electric vehicle 1 or electric vehicle 2. In addition, the improved power performance of the oil-cooled motor 100 or oil-cooled powertrain 10 is conducive to improving the driving experience of the electric vehicle 1 or electric vehicle 2.

[0131] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. An oil-cooled motor for driving wheels of an electric vehicle, characterized in that: The housing of the oil-cooled motor is used to fix and accommodate the motor stator and an oil spray ring of the oil-cooled motor. The stator core of the motor stator and the oil spray ring are arranged adjacent to each other along the axial direction of the oil-cooled motor. The end of the stator winding of the motor stator is exposed from the stator core. The oil spray ring surrounds the end of the stator winding of the motor stator. The oil spray ring includes a plurality of through holes, each of which is used to connect the inner circumference and outer circumference of the oil spray ring. The outer circumference of the oil spray ring includes an annular protrusion, wherein: The distance between each through hole and the stator core along the axial direction of the oil-cooled motor is smaller than the distance between the one annular protrusion and the stator core. The one annular protrusion is used to fix a plurality of axial protrusions. The plurality of axial protrusions are arranged at intervals along the circumference of the one oil spray ring. The plurality of axial protrusions are used to respectively abut the inner circumferential surface of the housing to fix the one oil spray ring. One end of each of the axial protrusions is fixed to the annular protrusion, the other end of each of the axial protrusions protrudes from the annular protrusion along the axial direction of the oil-cooled motor, and the distance between the other end of each of the axial protrusions and the central axis of the oil injection ring along the radial direction of the oil injection ring is greater than the distance between one end of each of the axial protrusions and the central axis of the oil injection ring.

2. The oil-cooled motor according to claim 1, characterized in that: In each of the axial protrusions, a thickness at one end is smaller than a thickness at the other end in a radial direction of the one oil injection ring.

3. The oil-cooled motor according to claim 1, characterized in that: The outer peripheral surface of the one oil injection ring further includes another annular protrusion, and the multiple through holes are distributed between the another annular protrusion and the one annular protrusion along the axial direction of the oil-cooled motor.

4. The oil-cooled motor according to any one of claims 1 to 3, characterized in that: The outer peripheral surface of the oil injection ring also includes another annular protrusion, and the another annular protrusion and the one annular protrusion are arranged at intervals along the axial direction of the oil-cooled motor and arranged on the same side of the multiple through holes. The distance between each through hole and the another annular protrusion along the axial direction of the oil-cooled motor is smaller than the distance between each through hole and the one annular protrusion, and the gap between the another annular protrusion and the one annular protrusion is used to accommodate an annular seal.

5. The oil-cooled motor according to claim 4, characterized in that: The outer diameter of the further annular protrusion is smaller than the outer diameter of the one annular protrusion, and the outer diameter of the one annular seal is larger than the outer diameter of the one annular protrusion.

6. The oil-cooled motor according to claim 1, characterized in that: The oil injection ring further includes an annular receiving groove, the notch of which faces the stator core along the axial direction of the oil-cooled motor, and the annular receiving groove is used to fix another annular seal.

7. The oil-cooled motor according to claim 6, characterized in that: The annular receiving groove includes two radial groove walls, wherein: One of the two radial slot walls surrounds the other radial slot wall, and the distance between the one radial slot wall and the stator core along the axial direction of the oil-cooled motor is greater than the distance between the other radial slot wall and the stator core.

8. The oil-cooled motor according to any one of claims 1 to 3, 6 and 7, characterized in that: Another annular seal is arranged between the stator core and the one oil spray ring along the axial direction of the oil-cooled motor, and the another annular seal includes an annular groove, the notch of the one annular groove faces the one oil spray ring along the axial direction of the one annular groove, and the one annular groove includes two abutting groove walls, wherein: One of the two abutting groove walls surrounds the other abutting groove wall, the one abutting groove wall is used to abut the outer peripheral surface of the one oil injection ring, and the other abutting groove wall is used to abut the inner peripheral surface of the one oil injection ring.

9. The oil-cooled motor according to claim 1, characterized in that: The inner circumferential surface of the housing includes a plurality of grooves, each of which is used to accommodate the other end of one of the axial protrusions.

10. The oil-cooled motor according to claim 9, characterized in that: The plurality of grooves are connected along the circumferential direction of the oil-cooled motor to form an annular connecting groove.

11. The oil-cooled motor according to claim 10, characterized in that: The annular connecting groove includes two axial groove walls arranged opposite to each other along the axial direction of the oil-cooled motor, and the distance between the two axial groove walls gradually decreases along the radial direction of the oil-cooled motor away from the central axis of the oil injection ring.

12. The oil-cooled motor according to any one of claims 1, 10 or 11, characterized in that: The annular protrusion is also used to fix a radial protrusion. The radial protrusion is arranged between the two axial protrusions along the circumference of the oil injection ring, and protrudes from the outer peripheral surface of the annular protrusion along the radial direction of the oil injection ring.

13. The oil-cooled motor according to any one of claims 1 to 3, characterized in that: The thickness of the other end of each of the axial protrusions increases first and then decreases along the radial direction of the one oil injection ring away from the central axis of the one oil injection ring; A dimension of each of the axial protrusions along the circumferential direction of the oil injection ring is greater than a dimension of each of the axial protrusions along the radial direction of the oil injection ring.

14. The oil-cooled motor according to any one of claims 1 to 3, characterized in that: The multiple axial protrusions and the multiple through holes are distributed on both sides of the one annular protrusion along the axial direction of the oil-cooled motor.

15. An oil-cooled powertrain, characterized in that: The oil-cooled powertrain includes a reducer and an oil-cooled motor according to any one of claims 1 to 14, wherein a motor shaft of the oil-cooled motor is used for transmission connection with an input shaft of the reducer.

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