CN220896409U - Motor, power assembly and electric vehicle - Google Patents

Abstract

The application provides a motor, a power assembly and an electric vehicle, wherein the motor comprises a die-casting shell and a stator, the die-casting shell comprises an inner oil duct, a stator sleeve and a cylinder wall protrusion, the stator sleeve is used for forming a stator cavity, the stator cavity is used for fixing and accommodating a stator, the protruding direction of the cylinder wall protrusion deviates from the stator sleeve, and the inner oil duct comprises at least one of an axial oil duct in the cylinder wall protrusion and a radial oil duct in the stator sleeve. The aperture of the axial oil duct along the circumferential direction of the motor is larger than the aperture along the radial direction of the motor. The radial oil duct is used for communicating the stator cavity, and the aperture of the radial oil duct along the circumferential direction of the motor is greater than the aperture along the axial direction of the motor. According to the application, the radial oil duct on the die-casting shell is larger than the aperture along the axial direction of the motor in the aperture along the circumferential direction of the motor, so that the edge stress of the oil hole is reduced, the cracking risk of the shell is reduced, the reliability of the strength of the die-casting shell is improved, the overall reliability of the power assembly is improved, and the cooling effect of the motor is ensured.

Description

Motor, power assembly and electric vehicle

Technical Field

The application relates to the technical field of power assemblies, in particular to a motor, a power assembly and an electric vehicle.

Background

Existing electric vehicles typically employ an integrated powertrain as a power source. At present, the power assembly comprises a plurality of components such as a motor, a motor controller, a speed reducer, a heat exchanger and the like, and in order to improve the overall performance of the electric vehicle, the power assembly needs to consider various design requirements such as reliability, heat dissipation performance and the like. In order to reduce the temperature of the power assembly in a working state, different cooling pipelines including a cooling liquid pipeline, a cooling liquid pipeline and the like are usually required to be arranged on the surface of the shell, however, the arrangement of the pipelines can cause the problems of abrupt change of the cross section of the shell structure, stress concentration, thickness reduction of the shell wall and the like, and further the stress concentration of the shell is caused to cause easy breakage, so that the overall structural strength of the power assembly is reduced.

Disclosure of utility model

The application provides a motor, a power assembly and an electric vehicle, which can reduce stress concentration of a shell.

In a first aspect, an embodiment of the present application provides an electric machine, including a die-cast housing and a stator, the die-cast housing including an internal oil passage, an integrally die-cast stator sleeve and a barrel wall protrusion, the stator sleeve being configured to form a stator cavity, the stator cavity being configured to secure and accommodate a stator, the barrel wall protrusion having a protrusion direction away from the stator sleeve, the internal oil passage including at least one of an axial oil passage in the barrel wall protrusion and a radial oil passage in the stator sleeve. The aperture of the axial oil duct along the circumferential direction of the motor is larger than the aperture along the radial direction of the motor, the radial oil duct is used for communicating with the stator cavity, and the aperture of the radial oil duct along the circumferential direction of the motor is larger than the aperture along the axial direction of the motor.

In the embodiment of the application, the aperture of the axial oil passage along the circumferential direction of the motor refers to the maximum aperture of the axial oil passage along the circumferential direction of the motor. The aperture of the axial oil passage along the radial direction of the motor refers to the maximum aperture of the axial oil passage along the radial direction of the motor. The aperture of the radial oil passage in the motor circumferential direction refers to the maximum aperture of the radial oil passage in the motor circumferential direction. The aperture of the radial oil passage in the axial direction of the motor refers to the maximum aperture of the radial oil passage in the axial direction of the motor.

In the embodiment of the application, the stator sleeve and the cylinder wall protrusion are formed by integral die casting, so that the structural strength of the die casting shell is improved. The stator sleeve is used for being in interference fit with the stator so that the stator is fixed in the stator sleeve. The cylinder wall bulge is positioned outside the stator sleeve, an axial oil passage is formed in the cylinder wall bulge, and materials of the stator sleeve are not required to be removed when the axial oil passage is formed, so that the structural strength of the stator sleeve is ensured.

In the embodiment of the application, the axial oil passage is used for conveying the cooling oil cooled by the heat exchanger into the die-casting shell, and the radial oil passage is used for inputting the cooling oil into the motor stator and cooling and lubricating parts in the motor.

In the embodiment of the application, the aperture of the radial oil duct along the circumferential direction of the motor is larger than the aperture of the radial oil duct along the axial direction of the motor, and when the die-casting shell is in interference fit with the stator to generate tensile stress, the tensile stress value along the motor shaft is larger than the tensile stress along the circumferential direction of the motor.

In the embodiment of the application, the aperture of the axial oil passage along the circumferential direction of the motor is larger than the aperture of the axial oil passage along the radial direction of the motor. The axial oil duct is flat in cross section, and when the aperture along the radial direction of the motor is smaller, the space occupied by the bulge of the cylinder wall above the stator sleeve along the radial direction of the motor is reduced, the power assembly is more compact, the whole volume of the power assembly is reduced, the aperture of the axial oil duct along the circumferential direction of the motor is large, the circulation of cooling oil is facilitated, and the circulation resistance is reduced.

In one embodiment, the radial oil passage includes an inboard opening that extends through an inner wall of the stator sleeve. The value of the included angle between the length direction of the inner opening and the axial direction of the motor is larger than 45 degrees and smaller than or equal to 90 degrees, wherein the length direction of the inner opening is the connecting line direction with the longest distance between two points in the inner opening.

In the embodiment of the application, the arrangement mode of the inner opening on the stator sleeve ensures that the aperture of the inner opening along the circumferential direction of the motor is larger than the aperture along the axial direction of the motor, ensures that the tensile stress born by the inner opening along the axial direction of the motor is larger than the tensile stress born by the inner opening along the circumferential direction of the motor, is more beneficial to dispersing the tensile stress generated in the axial direction of the stator sleeve when the stator sleeve is in interference fit with the stator, and reduces the tensile stress born by the inner opening on the die-casting shell in the axial direction of the stator sleeve, thereby increasing the strength reliability of the die-casting shell and reducing the cracking risk of the die-casting shell.

In the embodiment of the application, the radial oil duct further comprises an outer opening, the outer opening penetrates through the inner wall of the axial oil duct, and the outer opening, the inner opening and the stator are sequentially arranged along the radial direction of the motor, so that cooling oil sequentially passes through the outer opening and the inner opening from the axial oil duct and enters the inside of the stator sleeve.

In the embodiment of the application, the projections of the outer opening and the inner opening along the radial direction of the motor are in the projection of the stator, so that the cooling oil input by the radial oil duct is beneficial to directly contact with the stator of the motor to cool and lubricate, the cooling oil conveyed by the radial oil duct is beneficial to be output on the stator of the motor more quickly, and the cooling effect of the cooling oil on the motor is ensured.

In one embodiment, the mouth wall of the inside opening includes a partial mouth wall oppositely disposed along a length direction of the inside opening and a partial mouth wall oppositely disposed along a width direction of the inside opening, the width direction of the inside opening being perpendicular to the length direction of the inside opening. The radius of curvature of the partial opening walls oppositely arranged in the width direction of the inner opening is larger than that of the partial opening walls oppositely arranged in the length direction of the inner opening.

In the embodiment of the application, the part of the opening walls which are oppositely arranged in the width direction of the inner opening bear the tensile stress generated by the stator sleeve and the stator in the motor shaft direction, the part of the opening walls which are oppositely arranged in the length direction of the inner opening bear the tensile stress generated by the stator sleeve and the stator in the motor circumferential direction, and when the stator sleeve is in interference fit with the stator, the tensile stress generated in the motor shaft direction is larger than the tensile stress generated in the motor circumferential direction. In the embodiment of the application, the curvature radius of the part of the opening walls which are oppositely arranged in the width direction of the inner opening is larger than that of the part of the opening walls which are oppositely arranged in the length direction of the inner opening, so that the inner opening on the die-casting shell bears larger tensile stress in the motor shaft direction, and the part of the opening walls which are oppositely arranged in the width direction of the inner opening disperses the tensile stress, thereby ensuring that the tensile stress borne by the opening walls of the inner opening in the length direction and the width direction becomes relatively uniform, being beneficial to improving the structural strength reliability of the die-casting shell, reducing the cracking risk of the die-casting shell, prolonging the service life of the die-casting shell and improving the reliability of a power assembly.

In one embodiment, the inner opening is elliptical, the length direction of the inner opening is parallel to the major axis direction of the ellipse, and the minor axis direction of the ellipse is parallel to the motor axis direction.

In the embodiment of the application, the inner opening is designed to be elliptical, the elliptical structure is regular, the casting advantage is good, and the processing and casting of the oil hole designed on the die-casting shell in the production process are facilitated. The inboard opening is designed to oval, oval structural feature for the atress of die-casting casing in radial oil duct department is more even, also is favorable to dispersing the great tensile stress that produces in the motor shaft when die-casting casing and stator are joined in marriage simultaneously, thereby reduces the risk that die-casting casing breaks, makes the overall structure intensity of power assembly improve.

In one embodiment, the oil holes of the radial oil passage are distributed along the radial direction of the motor in equal diameter, or the axis of the radial oil passage is parallel to the radial direction of the motor.

In the embodiment of the application, the radial oil passage penetrates through the inner wall of the stator sleeve and the inner wall of the inner oil passage. The apertures of the radial oil channels are distributed along the radial equal diameter of the motor, so that the radial oil channels vertically penetrate through the stator sleeve, and cooling oil flowing from the axial oil channels reaches the stator through the radial oil channels in the shortest path for cooling and lubrication. The axis of the radial oil duct is parallel to the radial direction of the motor, the radial oil duct vertically penetrates through the stator sleeve, the path of cooling oil flowing from the axial oil duct through the radial oil duct to the stator is shortest, and the cooling process is quickened. Meanwhile, the radial oil duct penetrates through the stator sleeve in a vertical mode, so that the stator sleeve is regular in structure and favorable for dispersing tensile stress received by the radial oil duct.

In one embodiment, the radial oil passage is drilled or drawn radially from the motor.

In the embodiment of the application, the radial oil duct penetrates through the inner wall of the stator sleeve and the inner wall of the inner oil duct, and the radial oil duct is formed in a drilling mode, so that the operation is simple, the process difficulty is low, and the application range is enlarged. The inner wall of the radial oil duct formed by drawing is a blank surface, the density is high, and the leakage of cooling oil is avoided.

In one embodiment, along the radial direction of the motor, the projection of the radial oil passage is located in the projection of the cylinder wall, the radial oil passage is also used for communicating with the axial oil passage, and the projection of the radial oil passage is partially overlapped with the projection of the axial oil passage.

In the embodiment of the application, the radial oil duct is wrapped in the stator cylinder wall of the cylinder wall bulge along the radial direction of the motor, so that the integral structural strength of the stator sleeve is not affected even if the stator sleeve wall is perforated. In the embodiment of the application, the radial oil duct is communicated with the axial oil duct and receives the cooling oil conveyed from the axial oil duct, and the projection of the radial oil duct is overlapped with the projection part of the axial oil duct, so that the path of the cooling oil flowing through the axial oil duct and the radial oil duct to reach the stator is shortest along the radial direction of the motor, and the cooling oil is conveyed to the motor to cool and lubricate the motor more quickly.

In one embodiment, the axial oil passage has an elliptical cross section, wherein the cross section of the axial oil passage is perpendicular to the motor axis and the minor axis of the ellipse is parallel to the motor radial direction.

In the embodiment of the application, when the axial oil passage is communicated with the radial oil passage, the part of the axial oil passage section, which is attached to the opening at the outer side of the radial oil passage, is an elliptical arc, so that the cooling oil in the axial oil passage is more beneficial to be transmitted from the axial oil passage to the radial oil passage. In the embodiment of the application, the section of the axial oil duct is elliptical, the minor axis of the ellipse is parallel to the radial direction of the motor, and the curvature radius of the contact edge of the section of the axial oil duct and the radial oil duct is larger, so that the contact area is larger, the axial oil duct can be aligned with the axial oil duct more easily during the processing of the radial oil duct, the processing precision is improved, the processing difficulty is reduced, and the elliptical structure is also convenient for the demolding operation of the axial oil duct in the die casting process.

In the embodiment of the application, the section of the communication part of the axial oil passage and the radial oil passage falls into the projection of the radial oil passage along the radial direction of the motor. So that the radial oil passage has a larger flow area to receive the cooling oil delivered from the axial oil passage.

In one embodiment, the apertures of the axial oil channels are equiradially distributed along the motor axis, or the axis of the axial oil channels is parallel to the motor axis.

In the embodiment of the application, the axial oil passage is positioned in the cylinder wall bulge, the axial oil passage is parallel to the stator sleeve, and the axial oil passage is perpendicular to the radial oil passage.

In the embodiment of the application, the apertures of the axial oil channels are distributed along the axial equal diameter of the motor, so that the axial oil channels are parallel and penetrate through the stator sleeve, the axial oil channels do not occupy too much space of the stator sleeve along the radial direction of the motor, and the motor is beneficial to compact structure, so that the power assembly is compact in structure and small in overall occupied volume. The axis of the axial oil passage is parallel to the axial direction of the motor, and the cooling oil transmitted from the axial oil passage can be transmitted to the radial oil passage in the shortest path, so that parts inside the power supply are cooled and lubricated.

In one embodiment, the axial oil passage is drilled or drawn axially along the motor.

In the embodiment of the application, the axial oil passage penetrates through the cylinder wall bulge, and the axial oil passage is parallel to the stator sleeve. The axial oil duct is formed in a drilling mode, so that the operation is simple, the process difficulty is low, and the application range is enlarged. The inner wall of the axial oil duct formed by drawing is a blank surface, the density is high, and the leakage of cooling oil is avoided.

In one embodiment, the minimum distance between the inner wall of the radial oil passage and the outer wall of the cylinder wall protrusion is greater than or equal to the minimum distance between the inner wall of the axial oil passage and the outer wall of the cylinder wall protrusion.

In the embodiment of the application, the minimum distance between the inner wall of the radial oil duct and the outer wall of the cylinder wall protrusion is the minimum distance between the outer opening and the outer wall of the cylinder wall protrusion, and the minimum distance between the outer opening and the outer wall of the cylinder wall protrusion is larger than the minimum distance between the inner wall of the axial oil duct and the outer wall of the cylinder wall protrusion, so that the stator sleeve has higher structural strength even if the radial oil duct and the axial oil duct are arranged at the same time in the radial direction.

In one embodiment, the diameter of the radial oil passage along the motor circumferential direction is greater than or equal to the diameter of the axial oil passage along the motor circumferential direction, and the diameter of the radial oil passage along the motor circumferential direction is smaller than the maximum outer diameter of the cylinder wall protrusion along the motor circumferential direction.

In the embodiment of the application, the aperture of the radial oil passage along the circumferential direction of the motor is larger than or equal to the aperture of the axial oil passage along the circumferential direction of the motor, and the aperture of the radial oil passage along the axial direction of the motor is larger than that of the axial oil passage, so that the radial oil passage can completely receive cooling oil from the axial oil passage when the cooling oil in the axial oil passage flows through the radial oil passage, the circulation efficiency of the cooling oil is improved, and the control of the temperature rise of the motor is more facilitated. And on designing the stator sleeve with the radial oil duct, the radial oil duct is less than the protruding biggest external diameter along motor circumference of section of thick bamboo wall along motor circumference's aperture, and the radial oil duct can be wrapped up in the section of thick bamboo wall arch completely along motor circumference, is favorable to improving the structural strength of stator sleeve section of thick bamboo wall, reduces the fracture risk of die casting casing.

In one embodiment, the stator sleeve includes a stator oil passage section and two stator fixing sections, the two stator fixing sections are used for fixing the stator, the stator oil passage section is used for communicating with the radial oil passage, and the two stator fixing sections are respectively arranged on two sides of the stator oil passage section along the axial direction of the motor. The inner diameter of the stator oil duct section is larger than that of each stator fixed section, and the projection of the radial oil duct is located in the stator oil duct section along the radial direction of the motor.

In the embodiment of the application, the stator oil passage section is positioned between the two stator fixing sections, so that cooling oil can be conveyed to the motor stator in a larger range through the stator oil passage section to be cooled, and in the arrangement mode, the cooling oil can also come out of the radial oil passage at the fastest speed and then cover the motor stator to realize cooling and lubrication. When the stator is assembled in the stator sleeve, because the inner diameter of the stator oil duct section is larger than the inner diameter of the stator fixed sections, the stator is in interference fit with the inner parts of the two stator fixed sections, a gap is formed between the stator and the inner wall of the stator oil duct section, and when cooling oil flows into the stator oil duct from the radial oil duct, the stator oil duct is used for containing the cooling oil and conveying the cooling oil to other positions of the stator, so that the cooling effect of the motor is improved.

In a second aspect, an embodiment of the present application provides a power assembly, including a heat exchanger, a speed reducer, and any one of the motors described above, wherein an input shaft of the speed reducer in the speed reducer is fixed to a motor shaft in the motor, and the heat exchanger is configured to communicate an axial oil passage and a radial oil passage of the motor. According to the power assembly provided by the application, the motor converts electric energy provided by the motor controller into kinetic energy and transmits the kinetic energy to the input shaft of the speed reducer in the speed reducer, the input shaft of the speed reducer transmits power to the internal gear of the speed reducer, and the output shaft of the speed reducer is used for transmitting the power of the motor to wheels. The heat exchanger is used for carrying out heat exchange on cooling oil and cooling water of the whole vehicle and cooling the hot cooling oil. According to the motor provided by the application, the radial oil duct on the motor is designed to be longer than the axial length of the motor, so that the edge stress of the oil hole is reduced, the cracking risk of the shell is reduced, the reliability of the strength of the die-casting shell is improved, and the overall reliability of the power assembly is improved.

In a third aspect, an embodiment of the present application provides an electric vehicle, including a cooling system and a power assembly according to the second aspect, where the cooling system is configured to exchange heat with an oil passage of a heat exchanger in the power assembly, and cooling oil in the oil passage of the heat exchanger flows into an axial oil passage and a radial oil passage in a die-casting housing, and heights of the axial oil passage and the radial oil passage are higher than a height of a motor shaft of the motor along a gravity direction. The radial oil duct of the motor is designed to be longer than the radial oil duct of the motor, so that the edge stress of the oil hole is reduced, the reliability of the die-casting shell is improved, cooling oil is more beneficial to cooling internal parts of the motor, the reliability and the heat dissipation capacity of the power assembly are improved, and the overall performance of the electric vehicle is further improved.

Drawings

In order to more clearly describe the technical solution in the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be described below.

Fig. 1 is a schematic structural view of an electric vehicle according to an embodiment of the present application;

FIG. 2 is a cross-sectional view of a powertrain along a radial direction of a motor provided in accordance with an embodiment of the present application;

FIG. 3 is a cross-sectional view of a powertrain along an axial direction of a motor provided in accordance with an embodiment of the present application;

FIG. 4 is a schematic view illustrating an axial angle between an inner opening and a motor according to an embodiment of the present application;

FIG. 5 is an enlarged partial view of portion M1 of the powertrain of FIG. 3 in cross-section;

FIG. 6 is a schematic illustration of the shape of an inboard opening of a radial oil gallery provided by an embodiment of the application;

FIG. 7 is a partial cross-sectional view of a motor stator sleeve according to one embodiment of the present application;

FIG. 8 is an enlarged partial view of portion M2 of the powertrain of FIG. 2 in cross-section;

FIG. 9 is an enlarged partial view of portion M2 of the powertrain of FIG. 2 in cross-section;

FIG. 10 is a partial cross-sectional view of a motor stator sleeve according to one embodiment of the present application;

FIG. 11 is a stress cloud of a circular radial oil gallery provided by an embodiment of the present application;

FIG. 12 is a stress cloud of an elliptical radial oil gallery provided in accordance with an embodiment of the present application.

Detailed Description

The following description of the technical solutions according to the embodiments of the present application will be given with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments.

Furthermore, herein, the terms "upper," "lower," and the like, are defined with respect to the orientation in which the structure is schematically disposed in the drawings, and it should be understood that these directional terms are relative concepts, which are used for descriptive and clarity with respect thereto and which may be varied accordingly with respect to the orientation in which the structure is disposed.

For convenience of understanding, the following description will explain and describe related technical terms related to the embodiments of the present application.

Parallel: the parallelism defined by the embodiments of the present application is not limited to absolute parallelism, and the definition of parallelism is understood to be substantially parallel, allowing for non-absolute parallelism due to factors such as assembly tolerances, design tolerances, structural flatness, etc.

And (3) vertical: the vertical defined in the embodiments of the present application is not limited to an absolute vertical intersection (the included angle is 90 degrees), and allows a small angle range of error, for example, an assembly error range ranging from 80 degrees to 100 degrees, to be understood as a vertical relationship in a relation other than an absolute vertical intersection due to factors such as assembly tolerance, design tolerance, and structural flatness.

In order to reduce the temperature of the motor in the operating condition, generally, a cooling pipeline is required to be arranged on the surface of the shell to convey cooling oil to the inside of the shell, however, the arrangement of the pipeline can cause the cross section of the shell structure to be suddenly changed, the stress concentration is caused, the wall thickness of the shell is reduced, and the like, so that the strength of the shell is not satisfied.

The embodiment of the application provides a motor, which comprises a die-casting shell and a stator, wherein the die-casting shell comprises a stator sleeve and a cylinder wall protrusion which are integrally die-cast, and the integrally die-casting shell has higher structural strength. The stator sleeve is used for fixing and accommodating a stator, the cylinder wall protrusion comprises an axial oil passage, the stator sleeve comprises a radial oil passage, and the radial oil passage is used for communicating the inside of the stator sleeve. The length of the radial oil duct along the circumferential direction of the motor is larger than that of the radial oil duct along the axial direction of the motor. According to the embodiment of the application, the round oil hole on the die-casting shell is designed as the hole with the length along the circumferential direction of the motor being longer than the length along the axial direction of the motor, so that the edge stress of the oil hole is reduced, the cracking risk of the shell is reduced, the reliability of the strength of the die-casting shell is improved, and the cooling effect of the motor is ensured. Or the length of the axial oil duct along the circumferential direction of the motor is larger than the length of the axial oil duct along the radial direction of the motor, so that the section shape of the axial oil duct is relatively flat, the length of the axial oil duct along the axial direction of the motor is large, the circulation of cooling oil is facilitated, when the length of the axial oil duct along the radial direction of the motor is smaller, the space occupied by the cylinder wall protrusion above the stator sleeve along the radial direction of the motor is reduced, the arrangement of the power assembly is facilitated, the whole volume of the power assembly is reduced, and the transportation of the cooling oil in the cylinder wall protrusion of the axial oil duct is facilitated.

The motor provided by the embodiment of the application is applied to the power assembly, and the power assembly is applied to the electric vehicle, so that the overall performance of the electric vehicle is improved.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an electric vehicle 1 according to an embodiment of the application. In the embodiment of the application, the electric vehicle 1 includes a powertrain 10, a vehicle body 20, a battery pack 30, and wheels 40. The power assembly 10 and the battery pack 30 are fixed to the vehicle body 20. The powertrain 10 is configured to receive power from the battery pack 30 and to drive the wheels 40.

In embodiments of the present application, the battery pack 30 may also be referred to as a power battery.

In the embodiment of the present application, the electric vehicle 1 refers to a wheeled apparatus driven or towed by a power device.

The motor and the power assembly provided by the embodiment of the application are described in detail below.

Referring to fig. 2 and 3, fig. 2 is a sectional view of a power assembly along a radial direction of a motor according to an embodiment of the present application, and fig. 3 is a sectional view of the power assembly along an axial direction of the motor according to an embodiment of the present application.

As shown in fig. 2 and 3, the power train includes a motor 100, a decelerator 200, and a heat exchanger (not shown). Wherein the motor 100 converts electric energy provided from a motor controller (not shown) into kinetic energy and transmits the kinetic energy to a decelerator input shaft (not shown) in the decelerator 200, the decelerator input shaft transmitting power to an internal gear of the decelerator 200, and an output shaft of the decelerator 200 for transmitting the power of the motor 100 to the wheels 40. The heat exchanger is used for carrying out heat exchange on cooling oil and cooling water of the whole vehicle and cooling the hot cooling oil.

In the embodiment of the present application, as shown in fig. 2, the motor 100 and the decelerator 200 are arranged along the motor axial direction O, and a motor shaft (not shown) of the motor 100 is fixed to a decelerator input shaft of the decelerator 200.

In one embodiment, the powertrain 10 further includes a motor controller for receiving the direct current of the battery pack 30 and for outputting alternating current to the motor 100, the motor 100 for receiving the alternating current output by the motor controller and for driving the wheels 40 of the electric vehicle 1. The decelerator 200 serves to transmit power of the motor 100 to the wheels 40.

In the embodiment of the present application, the heat exchanger is used for cooling the cooling oil in the power assembly 10, and the cooled cooling oil output from the heat exchanger cools and lubricates the motor 100 and the speed reducer 200, thereby realizing temperature rise control of the power assembly 10.

With continued reference to fig. 2 and 3, in one embodiment, motor 100 includes die cast housing 110 and stator 120, with 120 being used to illustrate the position of stator 120 in fig. 2, without showing the structural configuration of stator 120. The die-cast housing 110 includes an internal oil passage, an integrally die-cast stator sleeve 130 and a cylinder wall protrusion 140, the stator sleeve 130 is used for forming a stator cavity S for fixing and accommodating the stator 120, the protrusion direction of the cylinder wall protrusion 140 is away from the stator 120 from the stator sleeve 130, the internal oil passage includes at least one of an axial oil passage 150 in the cylinder wall protrusion 140, and a radial oil passage 160 in the stator sleeve 130. Wherein, the aperture of the axial oil duct 150 along the motor circumferential direction C is larger than the aperture along the motor radial direction R, the radial oil duct 160 is used for communicating with the stator cavity S, and the aperture of the radial oil duct 160 along the motor circumferential direction C is larger than the aperture along the motor axial direction O.

In the embodiment of the present application, the aperture of the axial oil passage 150 in the motor circumferential direction C refers to the maximum aperture of the axial oil passage 150 in the motor circumferential direction C. The aperture of the axial oil passage 150 in the motor radial direction R refers to the maximum aperture of the axial oil passage 150 in the motor radial direction R. The aperture of the radial oil passage 160 in the motor circumferential direction C refers to the maximum aperture of the radial oil passage 160 in the motor circumferential direction C. The aperture of the radial oil passage 160 in the motor axial direction O refers to the maximum aperture of the radial oil passage 160 in the motor axial direction O.

In the embodiment of the present application, the motor 100 further includes a rotor (not shown), which is fixedly sleeved on the motor shaft, and the stator 120 drives the rotor to rotate after receiving the ac power, so as to drive the motor shaft to rotate. The die-cast housing 110 is used to house a motor shaft, a rotor and a stator 120. The axial oil passage 150 is parallel to the motor axial direction O, and the axial oil passage 150 is located outside the stator sleeve 130 in the motor radial direction R.

In the embodiment of the present application, the stator sleeve 130 and the cylinder wall protrusion 140 are formed by integral die casting, thereby improving the structural strength of the die-cast housing 110. The stator sleeve 130 is configured to have an interference fit with the stator 120 such that the stator 120 is secured within the stator sleeve 130. The cylinder wall protrusion 140 is positioned outside the stator sleeve 130, an axial oil passage 150 is formed in the cylinder wall protrusion 140, and the material of the stator sleeve 130 is not required to be removed when the axial oil passage 150 is formed, so that the structural strength of the stator sleeve 130 is ensured.

In the embodiment of the present application, the axial oil passage 150 is used for conveying the cooling oil cooled by the heat exchanger into the die-casting housing 110, and the radial oil passage 160 is used for inputting the cooling oil into the motor stator 120, so that the parts inside the power supply 100 are cooled and lubricated.

In the embodiment of the present application, the aperture of the radial oil passage 160 in the motor circumferential direction C is larger than the aperture of the radial oil passage 160 in the motor axial direction O, and when the die-casting housing 110 and the stator 120 are in interference fit to generate tensile stress, the tensile stress value in the motor axial direction O is larger than the tensile stress in the motor circumferential direction C. The embodiment of the application is beneficial to enlarging the area of the tensile stress borne by the part of the die-casting shell 110 where the radial oil duct 160 is distributed along the axial direction O of the motor, thereby being beneficial to dispersing the tensile stress of the die-casting shell 110 on the circumferential side of the radial oil duct 160, improving the strength reliability of the die-casting shell 110 and reducing the risk of cracking of the die-casting shell 110.

With continued reference to FIG. 2, in one embodiment, the radial oil gallery 160 includes an outboard opening 161 and an inboard opening 162. An inner opening 162 penetrates the inner wall of the stator sleeve 130 and an outer opening 161 penetrates the inner wall of the axial oil passage 150. The radial oil passage 160 penetrates the stator sleeve 130 in the motor radial direction R, so that the cooling oil flows more smoothly from the axial oil passage 150 into the inside of the stator sleeve 130, and the cooling oil flow path is reduced. In the embodiment of the present application, along the motor radial direction R, the axial oil passage 150, the outer opening 161, the inner opening 162 and the stator 120 are sequentially arranged, so that the cooling oil sequentially enters the inside of the stator sleeve 130 from the axial oil passage 150 through the outer opening 161 and the inner opening 162.

In the embodiment of the present application, the projections of the outer opening 161 and the inner opening 162 along the radial direction R of the motor are located in the projection of the stator 120, which is favorable for the cooling oil input by the radial oil duct 160 to directly contact with the stator 120 of the motor 100 so as to cool and lubricate, and is favorable for faster outputting the cooling oil conveyed by the radial oil duct 160 on the motor stator 120, so as to ensure the cooling effect of the cooling oil on the motor 100.

Referring to fig. 4, fig. 4 is a schematic diagram illustrating an axial angle between an inner opening and a motor according to an embodiment of the application. In one embodiment, as shown in a diagram of fig. 4, an included angle β between a length direction L of the inner opening 162 and the motor axial direction O is greater than 45 ° and less than or equal to 90 °, where the length direction L of the inner opening 162 refers to a connecting line direction with a longest distance between two points in the inner opening 162.

In the present embodiment, the inner opening 162 refers to an opening in which the radial oil passage 160 communicates with the inner wall of the stator sleeve 130.

In the embodiment of the present application, the arrangement manner of the inner opening 162 on the stator sleeve 130 ensures that the tensile stress born by the inner opening 162 along the motor axial direction O is greater than the tensile stress born by the inner opening 162 along the motor circumferential direction C, which is more favorable for dispersing the tensile stress generated in the axial direction of the stator sleeve 130 when the stator sleeve 130 is in interference fit with the stator 120, so that the tensile stress born by the inner opening 162 on the die-casting shell 110 along the axial direction of the stator sleeve 130 is reduced, thereby improving the strength reliability of the die-casting shell 110 and reducing the cracking risk of the die-casting shell 110.

Referring to fig. 4 b, in one embodiment, the angle β between the length direction L of the inner opening 162 and the axial direction O of the motor is equal to 90 °, so that the inner opening 162 receives a larger tensile stress along the axial direction O of the motor, and the cracking risk of the die-casting housing 110 is reduced.

Referring to fig. 4 c, in an embodiment, the value of the included angle β between the length direction L of the inner opening 162 and the axial direction O of the motor is equal to 60 °, so that the inner opening 162 can adapt to various application scenarios while bearing a larger tensile stress along the axial direction O of the motor, and the process requirement is reduced.

In one embodiment, the mouth walls of the inner opening 162 include a portion of mouth walls that are oppositely disposed along the length of the inner opening 162 and a portion of mouth walls that are oppositely disposed along the width of the inner opening 162, the width of the inner opening 162 being perpendicular to the length of the inner opening 162. The radius of curvature of the portion of the mouth wall that is oppositely disposed in the width direction of the inner opening 162 is larger than the radius of curvature of the portion of the mouth wall that is oppositely disposed in the length direction of the inner opening 162.

In the embodiment of the present application, the part of the opening walls of the inner opening 162 which are arranged in the width direction are subjected to the tensile stress generated by the stator sleeve 130 and the stator 120 in the motor axial direction O, the part of the opening walls of the inner opening 162 which are arranged in the length direction are subjected to the tensile stress generated by the stator sleeve 130 and the stator 120 in the motor circumferential direction C, and when the stator sleeve 130 is in interference fit with the stator 120, the tensile stress generated in the motor axial direction O is greater than the tensile stress generated in the motor circumferential direction C. In the embodiment of the application, the radius of curvature of the opening walls of the inner side opening 162 which are oppositely arranged in the width direction is larger than that of the opening walls of the inner side opening 162 which are oppositely arranged in the length direction, so that the inner side opening 162 on the die-casting shell 110 can bear larger tensile stress in the axial direction O of the motor, and the opening walls of the inner side opening 162 which are oppositely arranged in the width direction can better disperse the tensile stress, so that the tensile stress borne by the opening walls of the inner side opening 162 in the length direction and the width direction becomes relatively uniform, thereby being beneficial to improving the reliability of the structural strength of the die-casting shell 110, reducing the cracking risk of the die-casting shell 110, prolonging the service life of the die-casting shell 110 and improving the reliability of the power assembly 10.

Referring to fig. 3 and 5, fig. 5 is an enlarged partial view of the portion M1 of the powertrain shown in fig. 3 in cross-section.

As shown in fig. 5, in one embodiment, the inner opening 162 has an elliptical shape, and the length direction L of the inner opening 162 is parallel to the major axis direction of the ellipse, and the minor axis direction of the ellipse is parallel to the motor axis direction O. In the embodiment of the present application, the major axis direction of the ellipse is denoted as a, and the minor axis direction of the ellipse is denoted as B.

In the embodiment of the present application, the inner opening 162 is designed to be oval, and the oval structure is regular, which has good casting advantages and facilitates the processing and casting of the oil hole designed on the die-casting housing 110 in the production process. The inner opening 162 is designed to be oval, and the oval structural feature makes the stress of the die-casting housing 110 at the radial oil duct 160 more uniform, and is also beneficial to dispersing the larger tensile stress generated in the axial direction O of the motor when the die-casting housing 110 is matched with the stator 120, so that the risk of cracking the die-casting housing 110 is reduced, and the overall structural strength of the power assembly 10 is improved.

Referring to fig. 6, fig. 6 is a schematic view illustrating an inner opening shape of a radial oil gallery according to an embodiment of the application. In one embodiment, the structure of the inner opening 162 may be a combination of other shapes, provided that the inner opening 162 satisfies that the radius of curvature of the portion of the opening walls that are arranged opposite to each other in the width direction of the inner opening 162 is larger than the radius of curvature of the portion of the opening walls that are arranged opposite to each other in the width direction of the inner opening 162. Illustratively, the shape of the inside opening 162 shown in fig. 6 a is a gothic roof type, the shape of the inside opening 162 shown in fig. 6 b is a parabolic type, the shape of the inside opening 162 shown in fig. 6 c is a U type, and the shape of the inside opening 162 shown in fig. 6 d is a catenary type, not limited to an elliptical structure. In one embodiment, the shape of the inner opening 162 is a symmetrical structure, and the symmetry axis is parallel to the motor axis O. In the several cases provided in the embodiment of the present application, the radius of curvature of the part of the opening walls that are oppositely arranged in the width direction of the inner opening 162 is larger than the radius of curvature of the part of the opening walls that are oppositely arranged in the length direction of the inner opening 162, so that the inner opening 162 of the radial oil duct 160 shown in fig. 5 can achieve the effect of dispersing the tensile stress of the die-casting housing 110 in the axial direction O of the motor, and the cracking risk of the die-casting housing 110 is reduced.

In one embodiment, the apertures of the radial oil passages 160 are equiradially distributed along the motor radial direction R, or the axes of the radial oil passages 160 are parallel to the motor radial direction R.

In an embodiment of the present application, the radial oil passage 160 penetrates the inner wall of the stator sleeve 130 and the inner wall of the axial oil passage 150. The diameter of the radial oil passage 160 is distributed along the radial direction R of the motor in a constant diameter manner, so that the radial oil passage 160 vertically penetrates the stator sleeve 130, and the cooling oil flowing from the axial oil passage 150 reaches the stator 120 through the radial oil passage 160 in the shortest path for cooling and lubrication. The axis of the radial oil passage 160 is parallel to the radial direction R of the motor, the radial oil passage 160 vertically penetrates the stator sleeve 130, and the path of the cooling oil flowing from the axial oil passage 150 through the radial oil passage 160 to the stator 120 is shortest, thereby accelerating the cooling process. Meanwhile, the radial oil duct 160 penetrates through the stator sleeve 130 in a vertical mode, so that the stator sleeve 130 is regular in structure and is beneficial to distributing tensile stress received by the radial oil duct 160.

In one embodiment, the radial oil gallery 160 is drilled or drawn along the motor radial direction R. In the embodiment of the present application, the radial oil passage 160 penetrates through the inner wall of the stator sleeve 130 and the inner wall of the axial oil passage 150, and the radial oil passage 160 is formed in a drilling manner, so that the operation is simple, the process difficulty is low, and the application range is enlarged. The inner wall of the radial oil duct 160 formed by drawing is a blank surface, the density is high, and the leakage of cooling oil is avoided.

In one embodiment, along motor radial direction R, the projection of outer opening 161 completely overlaps the projection of inner opening 162.

In the embodiment of the present application, the projection overlapping of the inner opening 162 and the outer opening 161 is beneficial to the processing of the radial oil duct 160, and ensures that the flow path of the cooling oil in the radial oil duct 160 is shortest, which is more beneficial to the rapid cooling of the cooling oil introduced into the motor 100. The same radial positioning of the inner opening 162 and the outer opening 161 is also advantageous for making the structure of the die-cast housing 110 more regular and for distributing the tensile stress.

With continued reference to fig. 2, in one embodiment, the axial oil passage 150 has a larger aperture in the machine circumferential direction C than the axial oil passage 150 has in the machine radial direction R. In the embodiment of the present application, the cross-sectional shape of the axial oil passage 150 is flat, the aperture of the axial oil passage 150 along the motor circumferential direction C refers to the maximum aperture of the axial oil passage 150 along the motor circumferential direction C, and the aperture of the axial oil passage 150 along the motor radial direction R refers to the maximum aperture of the axial oil passage 150 along the motor radial direction R. In the embodiment of the application, when the aperture along the radial direction R of the motor is smaller, the space occupied by the cylinder wall protrusion 140 above the stator sleeve 130 along the radial direction R of the motor is reduced, the power assembly 10 is arranged more compactly, the whole volume of the power assembly 10 is reduced, the length of the axial oil duct 150 along the circumferential direction C of the motor is large, the circulation of cooling oil is facilitated, and the circulation resistance is reduced.

Referring to fig. 7, fig. 7 is a partial cross-sectional view of a stator sleeve of an electric motor according to an embodiment of the application. In one embodiment, along the radial direction R of the motor, the projection of the radial oil passage 160 is located within the projection of the cylinder wall protrusion 140, the radial oil passage 160 is further configured to communicate with the axial oil passage 150, and the projection of the radial oil passage 160 partially overlaps with the projection of the axial oil passage 150.

In the embodiment of the present application, the radial oil passage 160 is wrapped in the wall of the stator 120 along the radial direction R of the motor by the wall protrusion 140, so that the overall structural strength of the stator sleeve 130 is not affected even if the wall of the stator sleeve 130 is perforated. In the embodiment of the present application, the radial oil passage 160 is communicated with the axial oil passage 150, and receives the cooling oil conveyed from the axial oil passage 150, and the projection of the radial oil passage 160 overlaps with the projection of the axial oil passage 150, so that the path of the cooling oil flowing through the axial oil passage 150 and the radial oil passage 160 to reach the stator 120 is shortest along the radial direction R of the motor, so that the cooling oil can be conveyed to the motor 100 more quickly to cool and lubricate the internal parts of the motor 100.

Referring to fig. 2 and 8, fig. 8 is an enlarged partial view of the portion M2 of the powertrain shown in fig. 2 in cross-section. In one embodiment, the axial oil passage 150 has an elliptical cross-section, wherein the cross-section of the axial oil passage 150 is perpendicular to the motor axis O and the minor axis of the ellipse is parallel to the motor radial direction R.

In the embodiment of the present application, the axial oil passage 150 is parallel to the stator sleeve 130, and the section of the axial oil passage 150 along the radial direction R of the motor is the section of the axial oil passage 150.

In the embodiment of the present application, when the axial oil passage 150 is communicated with the radial oil passage 160, the section of the axial oil passage 150, which is attached to the opening 161 outside the radial oil passage 160, is an elliptical arc, which is more favorable for the cooling oil in the axial oil passage 150 to be transferred from the axial oil passage 150 to the radial oil passage 160. In the embodiment of the application, the cross section of the axial oil duct 150 is elliptical, the minor axis of the ellipse is parallel to the radial direction R of the motor, and the curvature radius of the contact edge between the cross section of the axial oil duct 150 and the radial oil duct 160 is larger, so that the contact area is larger, the axial oil duct 150 can be aligned with the radial oil duct 160 more easily during processing, the processing precision is improved, the processing difficulty is reduced, and the elliptical structure is also convenient for the demolding operation of the axial oil duct 150 in the die casting process.

In the embodiment of the present application, as shown in fig. 2, along the motor radial direction R, the projection of the cross section where the axial oil passage 150 communicates with the radial oil passage 160 falls into the projection of the radial oil passage 160, so that the radial oil passage 160 has a larger flow area to receive the cooling oil delivered from the axial oil passage 150.

In one embodiment, the apertures of the axial oil passage 150 are equiradially distributed along the motor axial direction O, or the axis of the axial oil passage 150 is parallel to the motor axial direction O.

In the embodiment of the present application, the axial oil passage 150 is located in the cylinder wall protrusion 140, the axial oil passage 150 is parallel to the stator sleeve 130, and the axial oil passage 150 is perpendicular to the radial oil passage 160.

In the embodiment of the application, the apertures of the axial oil channels 150 are distributed along the axial direction O of the motor in equal diameter, so that the axial oil channels 150 are parallel to penetrate the stator sleeve 130, the axial oil channels 150 do not occupy too much space above the stator sleeve 130 along the radial direction R of the motor, and the motor 100 is beneficial to compact structure, so that the power assembly 10 is compact in structure and small in overall occupied volume. The axis of the axial oil passage 150 is parallel to the motor axial direction O, and the cooling oil transferred from the axial oil passage 150 can be transferred to the radial oil passage 160 in the shortest path, so that the components inside the power supply machine 100 are cooled and lubricated.

In one embodiment, the axial oil passage 150 is drilled or drawn along the motor axis O. In an embodiment of the present application, an axial oil passage 150 penetrates through the cylindrical wall protrusion 140, and the axial oil passage 150 is parallel to the stator sleeve 130. The axial oil duct 150 is formed in a drilling mode, so that the operation is simple, the process difficulty is low, and the application range is enlarged. The inner wall of the axial oil duct 150 formed by drawing is a blank surface, the density is high, and the leakage of cooling oil is avoided.

With continued reference to fig. 2 and 8, in one embodiment, the minimum distance between the inner wall of the radial oil passage 160 and the outer wall of the barrel wall protrusion 140 is greater than or equal to the minimum distance between the inner wall of the axial oil passage 150 and the outer wall of the barrel wall protrusion 140.

As shown in fig. 8, in the embodiment of the present application, the minimum distance between the inner wall of the radial oil passage 160 and the outer wall of the cylinder wall protrusion 140 is the minimum distance between the outer opening 161 and the outer wall of the cylinder wall protrusion 140, the minimum distance between the outer opening 161 and the outer wall of the cylinder wall protrusion 140 is denoted as D1, and the minimum distance between the inner wall of the axial oil passage 150 and the outer wall of the cylinder wall protrusion 140 is denoted as D2.

In the embodiment of the application, D1 is equal to or greater than D2, so that even though the radial oil duct 160 and the axial oil duct 150 are arranged at the same time, the stator sleeve 130 has higher structural strength, namely the problem of strength reduction caused by the reduction of wall thickness due to the design of the pipeline on the wall protrusion 140 of the motor 100 is solved.

Referring to fig. 9, fig. 9 is an enlarged partial view of portion M2 of the powertrain of fig. 2 in cross-section. In one embodiment, the radial oil passage 160 has a bore diameter in the motor circumferential direction C that is greater than or equal to the bore diameter of the axial oil passage 150 in the motor circumferential direction C, and the radial oil passage 160 has a bore diameter in the motor circumferential direction C that is less than the maximum outer diameter of the cartridge wall protrusion 140 in the motor circumferential direction C.

In the embodiment of the present application, the aperture of the radial oil passage 160 in the motor circumferential direction C refers to the maximum aperture of the radial oil passage 160 in the motor circumferential direction C. The aperture of the axial oil passage 150 in the motor circumferential direction C refers to the maximum aperture of the axial oil passage 150 in the motor circumferential direction C. The aperture of the radial oil passage 160 in the motor circumferential direction C refers to the maximum aperture of the radial oil passage 160 in the motor circumferential direction C.

In the embodiment of the present application, as shown in fig. 9, the aperture of the radial oil passage 160 in the motor circumferential direction C is denoted as D3, the aperture of the axial oil passage 150 in the motor circumferential direction C is denoted as D4, and the maximum outer diameter of the cylinder wall protrusion 140 in the motor circumferential direction C is denoted as D5.

In the embodiment of the application, D3 is larger than or equal to D4, and the aperture of the radial oil duct 160 along the axial direction O of the motor is larger than that of the axial oil duct 150, so that when cooling oil in the axial oil duct 150 flows through the radial oil duct 160, the radial oil duct 160 can completely receive the cooling oil from the axial oil duct 150, the circulation efficiency of the cooling oil is improved, and the control of the temperature rise of the motor 100 is facilitated. And D3 is less than D5, radial oil duct 160 can be completely wrapped in cylinder wall protrusion 140 along motor circumferential direction C, which is beneficial to improving structural strength of the cylinder wall of stator sleeve 130 and reducing cracking risk of die-casting shell 110.

Referring to fig. 7 and 10, fig. 10 is a partial cross-sectional view of a stator sleeve of an electric motor according to an embodiment of the application. In one embodiment, the stator sleeve 130 includes a stator oil passage segment 170 and two stator fixing segments 180, the two stator fixing segments 180 are used to fix the stator 120, the stator oil passage segment 170 is used to communicate with the radial oil passage 160, and the stator fixing segments 180 are respectively arranged on two sides of the stator oil passage segment 170 along the motor axial direction O. The inner diameter of the stator oil passage segment 170 is greater than the inner diameter of each stator stationary segment 180, and the projection of the radial oil passage 160 along the motor radial direction R is located within the stator oil passage segment.

In the embodiment of the present application, as shown in fig. 10, the inner diameter of the stator oil passage segment 170 is denoted as D6, and the inner diameter of the stator fixing segment 180 is denoted as D7.

In the embodiment of the present application, the stator oil passage segment 170 is located in the middle of the two stator fixing segments 180, which is favorable for the cooling oil to be delivered to the motor stator 120 in a larger range through the stator oil passage segment 170 for cooling, and in such an arrangement, the cooling oil can also exit from the radial oil passage 160 at the fastest speed, and then cover the motor stator 120 for cooling and lubrication. When the stator is assembled in the stator sleeve 130, since D6 > D7 makes the stator and the inside of the two stator fixing sections 180 in interference fit, a gap is formed between the stator 120 and the inner wall of the stator oil passage section 170 to form a stator oil passage, and when the cooling oil flows into the stator oil passage section 170 from the radial oil passage 160, the stator oil passage section 170 is used for accommodating the cooling oil and delivering the cooling oil to other positions of the stator 120, thereby improving the cooling effect of the motor 100.

It should be noted that, the motor in the present application may also be used as a separate device and a separate speed reducer to form a power assembly, that is, various embodiments of the radial oil passage of the stator sleeve and the axial oil passage in the protrusion of the cylinder wall in the separate motor are the same as those of the motor in the power assembly in the foregoing, and will not be described herein.

Referring to fig. 2, 11 and 12, fig. 11 is a stress cloud of a circular radial oil passage according to an embodiment of the present application, and fig. 12 is a stress cloud of an elliptical radial oil passage according to an embodiment of the present application. In the embodiment of the application, the maximum stress born by the die casting shell 110 in the axial direction O of the motor in the scheme of the elliptical radial oil duct 160 is 135MPa, and the maximum stress born by the die casting shell 110 in the axial direction O of the motor in the scheme of the circular radial oil duct 160 is 218MPa, namely, the radial oil duct 160 is designed to be elliptical in the embodiment of the application, the maximum stress born by the die casting shell 110 in the axial direction O of the motor is reduced by 38%, the stress of the die casting shell 110 is obviously reduced, the reliability of the die casting shell 110 is improved, the interference fit failure rate of the die casting shell 110 and the stator 120 is also reduced, the integral performance of the motor 100 is improved, and the integral structural strength of the power assembly 10 is further improved. It should be noted that, when the material, the size, and the size of the radial oil passage 160 of the die-cast housing 110 are different, the maximum stress value of the radial oil passage 160 in the motor axial direction O may be different, and fig. 12 is only used to illustrate that the use of the elliptical radial oil passage 160 can reduce the maximum stress compared to the circular radial oil passage 160, and improve the structural strength of the motor 100.

The motor, the power assembly and the electric vehicle provided by the embodiment of the application are described in detail, and specific examples are applied to illustrate the principle and the embodiment of the application, and the description of the embodiment is only used for helping to understand the method and the core idea of the application; meanwhile, as those skilled in the art will have variations in specific embodiments and application scope in light of the ideas of the present application, the present description should not be construed as limiting the present application.

Claims (15)

1. The utility model provides a motor, its characterized in that, the motor includes die-casting casing and stator, the die-casting casing includes inside oil duct, integrative die-casting's stator sleeve and section of thick bamboo wall arch, the stator sleeve is used for forming the stator chamber, the stator chamber is used for fixing and holds the stator, the bellied protruding direction of section of thick bamboo wall deviates from the stator sleeve the stator, inside oil duct includes at least one of axial oil duct in the section of thick bamboo wall arch, radial oil duct in the stator sleeve, wherein:

The aperture of the axial oil duct along the circumferential direction of the motor is larger than the aperture along the radial direction of the motor;

The radial oil duct is used for communicating the stator cavity, and the aperture of the radial oil duct along the circumferential direction of the motor is larger than the aperture along the axial direction of the motor.

2. The electric machine of claim 1, wherein the radial oil passage includes an inboard opening extending through an inner wall of the stator sleeve, wherein:

The value of the included angle between the length direction of the inner opening and the axial direction of the motor is larger than 45 degrees and smaller than or equal to 90 degrees, wherein the length direction of the inner opening is the connecting line direction with the longest distance between two points in the inner opening.

3. The motor of claim 2, wherein the mouth walls of the inside opening include partial mouth walls oppositely arranged in a longitudinal direction of the inside opening and partial mouth walls oppositely arranged in a width direction of the inside opening, the width direction of the inside opening being perpendicular to the longitudinal direction of the inside opening:

The curvature radius of the part of the opening walls which are oppositely arranged along the width direction of the inner opening is larger than that of the part of the opening walls which are oppositely arranged along the length direction of the inner opening.

4. The motor of claim 2, wherein the inner opening has an elliptical shape, a length direction of the inner opening is parallel to a major axis direction of the elliptical shape, and a minor axis direction of the elliptical shape is parallel to the motor axis direction.

5. The electric machine of claim 1, wherein the apertures of the radial oil channels are equiradially distributed along the machine radial direction or the axes of the radial oil channels are parallel to the machine radial direction.

6. The electric machine of claim 5, wherein the radial oil passage is drilled or drawn radially along the electric machine.

7. The electric machine of any one of claims 1-6, wherein a projection of the radial oil passage along a radial direction of the electric machine is located within a projection of the barrel wall protrusion, the radial oil passage further configured to communicate with the axial oil passage, the projection of the radial oil passage partially overlapping the projection of the axial oil passage.

8. The electric machine of any of claims 1-6, wherein the cross-section of the axial oil passage is elliptical, wherein the cross-section of the axial oil passage is perpendicular to the machine axis, and wherein a minor axis of the ellipse is parallel to the machine radial direction.

9. The electric machine of any one of claims 1-6, wherein the apertures of the axial oil channels are equiradially distributed along the machine axis or the axis of the axial oil channels is parallel to the machine axis.

10. The electric machine of claim 9, wherein the axial oil passage is drilled or drawn axially along the electric machine.

11. The electric machine of claim 7, wherein a minimum distance between an inner wall of the radial oil passage and an outer wall of the cylinder wall protrusion is greater than or equal to a minimum distance between an inner wall of the axial oil passage and an outer wall of the cylinder wall protrusion.

12. The electric machine of claim 7, wherein the radial oil passage has an aperture in the machine circumferential direction that is greater than or equal to an aperture in the machine circumferential direction of the axial oil passage, and wherein the radial oil passage has an aperture in the machine circumferential direction that is less than a maximum outer diameter of the cylinder wall protrusion in the machine circumferential direction.

13. The electric machine of claim 7, wherein the stator sleeve includes a stator oil passage section and two stator fixing sections for fixing the stator, the stator oil passage section being for communicating with the radial oil passage, the two stator fixing sections being arranged on both sides of the stator oil passage section in the machine axial direction, respectively, wherein:

The inner diameter of the stator oil duct section is larger than that of each stator fixed section, and the projection of the radial oil duct along the radial direction of the motor is positioned in the stator oil duct section.

14. A powertrain comprising a heat exchanger, a reducer and the motor of any one of claims 1-13, wherein a reducer input shaft in the reducer is fixed to a motor shaft in the motor, and the heat exchanger is configured to communicate an axial oil passage and a radial oil passage of the motor.

15. An electric vehicle comprising a cooling system for exchanging heat with the oil passage of a heat exchanger in the power assembly and the power assembly of claim 14, wherein the cooling oil in the heat exchanger oil passage flows into the axial oil passage and the radial oil passage in the die casting housing, and the heights of the axial oil passage and the radial oil passage are higher than the height of a motor shaft of the motor along the gravity direction.