Power assembly with inclined mounting surface and electric vehicle

Abstract

The utility model provides a power assembly with an inclined mounting surface and an electric vehicle, the power assembly comprises a motor and a speed reducer, and a shell of the power assembly comprises at least one of a motor cavity and a speed reducer cavity. The outer surface of the shell comprises an inclined mounting surface, and the inclined mounting surface comprises a through hole. The through hole is used for communicating the exterior of the shell with the motor cavity or the speed reducer cavity. And one inclined mounting surface is used for fixing one cover plate. And the cover plate comprises another inclined mounting surface. And the included angle between the other inclined mounting surface and the axial direction of the through hole is the same as the included angle between one inclined mounting surface and the axial direction of the through hole, and the value of the included angle is greater than 0 and less than 90. And at least one of one inclined mounting surface and the other inclined mounting surface comprises an annular groove. The annular groove is used for containing an annular sealing ring, and the annular sealing ring is used for being matched with one inclined installation face and the other inclined installation face to seal the through hole. The annular sealing ring is not prone to falling off in the assembling process, and the assembling efficiency of the power assembly is improved.

Description

Technical Field

[0001] The present application relates to the technical field of powertrain, and in particular to a powertrain and an electric vehicle with an inclined mounting surface. Background Art

[0002] The housing of the powertrain usually includes a through hole, which is sealed by a sealing ring to reduce the risk of lubricating oil leaking from the through hole. However, during the assembly process of the powertrain, there is a risk of the sealing ring falling off, which reduces the sealing reliability of the through hole. Utility Model Content

[0003] The present application provides a powertrain and an electric vehicle with an inclined mounting surface.

[0004] In a first aspect, the present application provides a powertrain with an inclined mounting surface, the powertrain including a motor and a reducer. The housing of the powertrain includes at least one of a motor cavity and a reducer cavity. The motor cavity is used to fix the stator of the motor. The reducer cavity is used to accommodate multiple gears of the reducer. The outer surface of the housing includes an inclined mounting surface. The inclined mounting surface includes a through hole. The through hole is used to connect the outside of the housing with the motor cavity or the reducer cavity. The inclined mounting surface is used to fix a cover plate. The cover plate includes another inclined mounting surface. The other inclined mounting surface and the one inclined mounting surface have the same axial angle with the one through hole, and the value of the angle is greater than 0 and less than 90. At least one of the one inclined mounting surface and the other inclined mounting surface includes an annular groove. The one annular groove is used to accommodate an annular sealing ring. The annular sealing ring is used to cooperate with the one inclined mounting surface and the other inclined mounting surface to seal the through hole.

[0005] In the embodiment of the present application, the two inclined mounting surfaces are both inclined relative to the axial direction of the through hole, and the annular sealing ring accommodated in the annular groove is inclined. The annular groove can support the annular sealing ring, so that the annular sealing ring is not easy to fall off from the annular groove, thereby improving the sealing reliability of the through hole. In addition, during the installation process of the cover plate, the annular sealing ring and the housing, the annular sealing ring is not easy to be displaced, reducing the risk of poor installation. The inside and outside of the housing are reliably isolated, which is conducive to ensuring the normal operation of the powertrain. In addition, the two inclined mounting surfaces have a larger area for sealing the through hole, which improves the convenience and operability of sealing the through hole, and is more conducive to sealing the through hole.

[0006] In one embodiment, the angle between the other inclined mounting surface and the one inclined mounting surface and the axial direction of the through hole is greater than 5 and less than 30. In the embodiment of the present application, the angle between each inclined mounting surface and the axial direction of the through hole is greater than 5°, so that the annular sealing ring is not easy to fall off from the annular groove, reducing the difficulty of installing the annular sealing ring and improving the sealing reliability of the through hole. The angle between each inclined mounting surface and the axial direction of the through hole is less than 30°, and the two inclined mounting surfaces are easy to form, which is conducive to reducing the axial size of the powertrain along the through hole.

[0007] In one embodiment, the axis of the through hole coincides with the axis of the motor shaft of the motor or the axis of the input shaft of the reducer. In the embodiment of the present application, the through hole is coaxially arranged with the motor shaft or the input shaft of the reducer, and the through hole can be used to assist the automated assembly of the powertrain, thereby improving the assembly efficiency and convenience of the powertrain.

[0008] In one embodiment, the one through hole is used to connect the outside of the housing with the one reducer cavity. In the embodiment of the present application, the through hole connects the reducer cavity, which improves the convenience and feasibility of opening the through hole and reduces the adverse effects of the opening of the through hole on the housing structure and wiring.

[0009] In one embodiment, the housing includes an end cover, the outer surface of the end cover includes the inclined mounting surface, and the inner surface of the end cover is used to rotatably connect a bearing of the input shaft of the reducer. The through hole penetrates the inner surface and the outer surface of the end cover along the axial direction of the through hole. In the embodiment of the present application, the end cover of the reducer includes a through hole, which has little effect on the housing structure and routing, thereby improving the operability and feasibility of opening the through hole.

[0010] In one embodiment, the inner surface of the end cover is used to rotate a bearing of the motor shaft connected to the motor. In the embodiment of the present application, the end cover of the motor includes a through hole, and the relatively flat end cover facilitates the opening of the through hole. The through holes are arranged along the axial direction and can be used to assist the assembly of the powertrain.

[0011] In one embodiment, the diameter of the through hole is smaller than or equal to the inner diameter of the outer ring of the one bearing, which is beneficial to improving the structural strength of the end cover.

[0012] In one embodiment, the outer diameter of the one inclined mounting surface is greater than or equal to the outer diameter of the outer ring of the one bearing. In the embodiment of the present application, the one inclined mounting surface can provide a larger area for fixing the other inclined mounting surface, which is convenient for installing the other inclined mounting surface. The larger outer diameter of the one inclined mounting surface can also increase the diameter of the annular sealing ring. An annular sealing ring of larger size is easier to fit into the annular groove. The opening of the annular groove is also simpler.

[0013] In one embodiment, the outer surface of the housing includes an annular protrusion structure, and the annular protrusion structure protrudes toward the other inclined mounting surface along the axial direction of the one through hole. The end surface of the annular protrusion structure facing the other inclined mounting surface along the axial direction of the one through hole is used to form the one inclined mounting surface.

[0014] In the embodiment of the present application, the annular protrusion structure is protruded on the outer surface of the shell, which is conducive to fixing the cover plate to the shell and improving the convenience of assembly of the cover plate. In addition, the annular protrusion structure is more likely to form the inclined mounting surface to reduce the risk of the annular sealing ring falling off, thereby improving the sealing reliability of the through hole.

[0015] In one embodiment, the annular protrusion structure includes two ends along the direction of gravity, and the two ends of the annular protrusion structure have different thicknesses along the axial direction of the power assembly. In the embodiment of the present application, since the two ends of the annular protrusion structure have different thicknesses along the direction of gravity, the end with a larger thickness can support the annular sealing ring. Relying on the effect of gravity, the annular sealing ring is not easy to fall off, which is conducive to the efficient assembly of the power assembly and improves the sealing reliability of the through hole.

[0016] In one embodiment, the outer surface of the shell includes a plurality of mounting posts, and the plurality of mounting posts are used to fix the one cover plate. The plurality of mounting posts are sequentially arranged at intervals along the circumference of the one through hole on the outer peripheral side of the one annular protrusion structure. In the embodiment of the present application, the plurality of mounting posts are convexly arranged on the outer surface of the shell, which is conducive to fixing the cover plate with the plurality of mounting posts, thereby improving the convenience of assembling the cover plate.

[0017] In one embodiment, the end surface of each mounting post facing the other inclined mounting surface along the axial direction of the one through hole is parallel to the other inclined mounting surface. The end surfaces of the multiple mounting posts facing the other inclined mounting surface along the axial direction of the one through hole are coplanar. In the embodiment of the present application, the end surfaces of the multiple mounting posts facing the other inclined mounting surface are on the same plane, which is conducive to fixing the cover plate with the multiple mounting posts and improves the convenience of assembly of the cover plate.

[0018] In one embodiment, the inner surface of the housing includes another annular protrusion structure, the inner circumference of which is used to fix the outer ring of a bearing of the motor shaft of the motor or the input shaft of the reducer. The protrusion direction of the other annular protrusion structure is opposite to that of the one annular protrusion structure.

[0019] In the embodiment of the present application, the other annular protrusion structure protrudes away from the outer surface of the shell along the axis of the through hole, and the other annular protrusion structure can make full use of the space in the shell to reduce the size of the power assembly.

[0020] In one embodiment, the axis of the other annular protrusion structure coincides with the axis of the one annular protrusion structure. In the embodiment of the present application, the two annular protrusion structures are coaxially arranged, and the through hole is coaxially arranged with the motor shaft or the input shaft of the reducer. The through hole can be used to assist the automatic assembly of the powertrain, thereby improving the assembly efficiency and convenience of the powertrain.

[0021] In one embodiment, along the axial direction of the through hole, the minimum thickness of the one annular protrusion structure is less than the thickness of the other annular protrusion structure. In the embodiment of the present application, since the axial end surface of the one annular protrusion structure is used to form the one inclined mounting surface, reducing the axial thickness of the one annular protrusion structure is conducive to reducing the axial size of the powertrain.

[0022] In one embodiment, the one inclined mounting surface includes the one annular groove, and the one inclined mounting surface includes two ends along the gravity direction. Along the gravity direction, the height of one end of the one inclined mounting surface is greater than the height of the other end of the one inclined mounting surface. Along the axial direction of the one through hole, the distance between the one end of the one inclined mounting surface and the inner surface of the shell is smaller than the distance between the other end of the one inclined mounting surface and the inner surface of the shell.

[0023] In the embodiment of the present application, the inclined form of the one inclined mounting surface allows the annular sealing ring to be installed in the annular groove, and the annular sealing ring is not easy to fall off under the action of gravity, thereby improving the power assembly efficiency and the sealing reliability of the through hole. In addition, since the annular groove is provided on the one inclined mounting surface, the cover plate is easy to observe during assembly, reducing the risk of displacement and falling off of the annular sealing ring.

[0024] In one embodiment, the outer surface of the cover plate is opposite to the other inclined mounting surface along the axial direction of the one through hole, the other inclined mounting surface includes the one annular groove, and the other inclined mounting surface includes two ends along the gravity direction. In the gravity direction, the height of one end of the other inclined mounting surface is greater than the height of the other end of the other inclined mounting surface. In the axial direction of the one through hole, the distance between the one end of the other inclined mounting surface and the outer surface of the cover plate is smaller than the distance between the other end of the other inclined mounting surface and the outer surface of the cover plate.

[0025] In the embodiment of the present application, the inclination of the other inclined mounting surface enables the annular sealing ring to be installed in the annular groove, and the annular sealing ring is not easy to fall off under the action of gravity, thereby improving the powertrain assembly efficiency and the sealing reliability of the through hole.

[0026] In one embodiment, the inner diameter of the annular groove is larger than the diameter of the through hole, which is beneficial for the annular sealing ring to seal the through hole.

[0027] In one embodiment, the outer diameter of the one annular groove is smaller than the outer diameter of the one inclined mounting surface, and smaller than the outer diameter of the other inclined mounting surface. The annular groove includes two groove walls. The two groove walls of the annular groove can limit the annular sealing ring in the radial direction of the through hole, reduce the risk of radial displacement of the annular sealing ring, and improve the reliability of the annular sealing ring sealing the through hole.

[0028] In one embodiment, the angle between the bottom of the annular groove and the axial direction of the through hole is greater than 0 and less than 90. In the embodiment of the present application, the bottom of the annular groove is inclined relative to the axial direction of the through hole, which is beneficial to reduce the maximum depth of the annular groove and facilitate the opening of the annular groove.

[0029] In one embodiment, the bottom of the annular groove is parallel to the one inclined mounting surface or the other inclined mounting surface. In the embodiment of the present application, the bottom of the annular groove is parallel to any inclined mounting surface, which is beneficial to reduce the maximum depth of the annular groove and facilitate the opening of the annular groove.

[0030] In one embodiment, the depth of the annular groove along the axial direction of the annular groove is less than or equal to the width of the annular groove along the radial direction of the annular groove. In the embodiment of the present application, the width of the annular groove is greater than the depth of the annular groove. When the annular sealing ring is assembled into the annular groove, the annular sealing ring is easily assembled due to the large width of the annular groove, thereby improving the assembly efficiency of the powertrain.

[0031] In a second aspect, the present application provides an electric vehicle, comprising wheels, a battery pack, and a powertrain as described in any one of the above items, wherein the powertrain is used to receive power from the battery pack and drive the wheels. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments of the present application will be described below.

[0033] Figure 1 A schematic diagram of an electric vehicle provided in accordance with an embodiment of the present application.

[0034] Figure 2 A schematic diagram of a powertrain provided in accordance with an embodiment of the present application.

[0035] Figure 3 A schematic diagram of a powertrain provided in accordance with an embodiment of the present application.

[0036] Figure 4 An exploded view of a housing, a sealing ring and a cover plate provided in one embodiment of the present application.

[0037] Figure 5 A cross-sectional view of a powertrain provided in accordance with an embodiment of the present application.

[0038] Figure 6 A three-dimensional diagram of a housing provided in accordance with an embodiment of the present application. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0040] In addition, in this article, directional terms such as "upper" and "lower" are defined relative to the orientation of the structure schematically placed in the drawings. It should be understood that these directional terms are relative concepts. They are used for relative description and clarification, and they can change accordingly according to the change of the orientation of the structure.

[0041] For ease of understanding, the relevant technical terms involved in the embodiments of the present application are explained and described below.

[0042] Parallelism: The parallelism defined in the embodiments of the present application is not limited to absolute parallelism. This definition of parallelism can be understood as basic parallelism, which allows for situations where the absolute parallelism is not achieved due to factors such as assembly tolerance, design tolerance, and the influence of structural flatness.

[0043] Vertical: The verticality defined in the embodiments of the present application is not limited to an absolute vertical intersection relationship (angle of 90 degrees). It allows for a relationship that is not absolutely vertical due to factors such as assembly tolerance, design tolerance, and influence of structural flatness. It also allows for errors in a small angle range. For example, the assembly error range of 80 to 100 degrees can be understood as a vertical relationship.

[0044] See also Figure 1 , Figure 1 Schematic diagram of an electric vehicle provided in one embodiment of the present application. The electric vehicle 1 includes a battery pack 4, wheels 3 and a powertrain 2. The powertrain 2 and the battery pack 4 are mounted on the frame of the electric vehicle 1, and the powertrain 2 is used to receive power from the battery pack 4 and drive the wheels 3 to rotate. In one embodiment, the electric vehicle 1 may include one or more powertrains 2.

[0045] Among them, the electric vehicle 1 includes a two-wheeled, three-wheeled or four-wheeled electric vehicle 1. The electric vehicle 1 can be a pure electric vehicle (Pure Electric Vehicle / Battery Electric Vehicle, PEV / BEV), a hybrid vehicle (Hybrid Electric Vehicle, HEV), a range extended electric vehicle (Range Extended Electric Vehicle, REEV), a plug-in hybrid electric vehicle (Plug-in Hybrid Electric Vehicle, PHEV), and a new energy vehicle (NewEnergy Vehicle). In one embodiment, the electric vehicle 1 is a means of transportation. The electric vehicle 1 is one of a commercial vehicle, a passenger car, a motorcycle, a flying car, and a train. In one embodiment, the electric vehicle 1 is an industrial vehicle or an engineering vehicle. The electric vehicle 1 is one of a forklift, a trailer, a tractor, an excavator, a bulldozer, and a crane. In one embodiment, the electric vehicle 1 can also be agricultural equipment, amusement equipment, a toy vehicle, etc.

[0046] See also Figure 2 , Figure 2 Schematic diagram of a powertrain provided in one embodiment of the present application. The powertrain 2 includes a reducer 10 and a motor 20. The input shaft 11 of the reducer 10 is used to transmit and connect the motor shaft 21 of the motor 20. The input shaft 11 of the reducer 10 is used to receive power transmitted by the motor shaft 21. The axial direction of the input shaft 11 of the reducer 10 is parallel to the axial direction of the motor shaft 21. The multiple gears of the reducer 10 can change the transmission ratio between the motor 20 and the wheel 3.

[0047] In one embodiment, the powertrain 2 further includes a wheel drive axle 5 and a differential 6 (eg Figure 2 The wheel drive axle 5 is fixedly connected to the wheel 3. The reducer 10 receives the power transmitted by the motor shaft 21 through the input shaft of the reducer and transmits the power to the wheel drive axle 5 through the differential 6 to drive the wheel 3 to rotate. The differential 6 can enable the left and right (or front and rear) wheels to rotate at different speeds.

[0048] In one embodiment, the powertrain 2 includes two motors 20 , and the two motors 20 are used to independently control the wheels 3 on both sides.

[0049] In one embodiment, the motor 20 includes a motor shaft 21, a motor rotor, a motor stator, and a motor winding, wherein the motor rotor is sleeved and fixed to the outer surface of the motor shaft 21. The motor stator is sleeved on the motor rotor and spaced from the outer surface of the motor rotor. The motor winding is installed and fixed to the motor stator.

[0050] In one embodiment, the powertrain 2 further includes a motor controller. The battery pack 4 includes at least one power battery. The motor controller connects the battery pack 4 and the motor winding of the motor 20, and the motor controller is used to receive the direct current output by the battery pack 4 and convert the direct current output by the battery pack 4 into alternating current and transmit it to the motor winding. The rotating magnetic field generated by the motor winding after receiving the alternating current interacts with the permanent magnet on the motor rotor. The action of the electromagnetic field causes the motor rotor to rotate, thereby driving the motor shaft 21 to rotate.

[0051] See also Figure 3 , Figure 3 A schematic diagram of a powertrain provided in an embodiment of the present application. The present application provides a powertrain 2 with an inclined mounting surface, the powertrain 2 including a motor 20 and a reducer 10. The housing 30 of the powertrain 2 includes at least one of a motor cavity 32 and a reducer cavity 31. A motor cavity 32 is used to fix the stator of the motor 20, and a reducer cavity 31 is used to accommodate multiple gears of the reducer 10.

[0052] See also Figure 4 , Figure 4 An exploded view of a housing, a sealing ring and a cover plate provided in one embodiment of the present application. The outer surface of the housing 30 includes an inclined mounting surface 100. For the convenience of description, an inclined mounting surface 100 is defined as an inclined mounting surface 100a. The inclined mounting surface 100a includes a through hole 110. The through hole 110 is used to connect the outside of the housing 30 with the motor cavity 32 or the reducer cavity 31. The inclined mounting surface 100a is used to fix a cover plate 40.

[0053] The cover plate 40 includes another inclined mounting surface 100. For the convenience of description, the other inclined mounting surface 100 is defined as an inclined mounting surface 100b. The inclined mounting surface 100b and the inclined mounting surface 100a have the same angle with the axial direction of the through hole 110, and the value of the angle is greater than 0 and less than 90.

[0054] See also Figure 5 , Figure 5 A cross-sectional view of a powertrain provided in one embodiment of the present application. At least one of the inclined mounting surface 100a and the inclined mounting surface 100b includes an annular groove 120. The annular groove 120 is used to accommodate an annular sealing ring 130. The annular sealing ring 130 is used to cooperate with the inclined mounting surface 100a and the inclined mounting surface 100b to seal the through hole 110.

[0055] The motor cavity 32 is also used to accommodate the rotor of the motor 20 and the motor shaft 21. The multiple gears of the reducer 10 are used to drive and connect the motor shaft 21 and the wheel 3.

[0056] The through hole 110 is used to connect the outside and the inside of the housing 30. In one embodiment, the through hole 110 is used to connect the outside of the housing 30 with the motor cavity 32. In one embodiment, the through hole 110 is used to connect the outside of the housing 30 with the reducer cavity 31.

[0057] The two inclined mounting surfaces 100 are two surfaces opposite to the housing 30 and the cover plate 40. The two inclined mounting surfaces 100 are inclined relative to the axial direction of the through hole 110. Each inclined mounting surface 100 intersects with the axial direction of the through hole 110 to form two angles. The value of one of the angles is greater than 0 and less than 90. Each inclined mounting surface 100 is not perpendicular to the axial direction of the through hole 110.

[0058] The area of ​​the inclined mounting surface 100a is larger than the area of ​​the projection of the inclined mounting surface 100a along the axial direction of the through hole 110. The area of ​​the inclined mounting surface 100b is larger than the area of ​​the projection of the inclined mounting surface 100b along the axial direction of the through hole 110. The inclined mounting surface 100b is used to cover the through hole 110 of the inclined mounting surface 100a. The two inclined mounting surfaces 100 are sealed and connected by the annular sealing ring 130 in the annular groove 120.

[0059] See also Figure 6 , Figure 6 A three-dimensional diagram of a housing provided in one embodiment of the present application. In one embodiment, the inner diameter of the annular groove 120 is greater than the diameter of the through hole 110. Since the annular sealing ring 130 surrounds the outer peripheral side of the through hole 110, the through hole 110 is sealed. In one embodiment, the housing 30 contains lubricating oil, and since the through hole 110 is sealed, the lubricating oil contained in the lubricating housing 30 cannot leak to the outside of the housing 30 through the through hole 110.

[0060] In one embodiment, along a direction perpendicular to the inclined mounting surface 100 , the annular groove 120 is recessed from one of the two inclined mounting surfaces 100 away from the other of the two inclined mounting surfaces 100 .

[0061] In one embodiment, one of the inclined mounting surfaces 100a and 100b includes an annular groove 120, the annular sealing ring 130 is interference fit with the groove bottom of the annular groove 120, and the annular sealing ring 130 is interference fit with the other of the inclined mounting surfaces 100a and 100b to seal the through hole 110.

[0062] In the embodiment of the present application, the two inclined mounting surfaces 100 are both inclined relative to the axial direction of the through hole 110, and the annular sealing ring 130 accommodated in the annular groove 120 is inclined. The annular groove 120 can support the annular sealing ring 130, so that the annular sealing ring 130 is not easy to fall off from the annular groove 120, thereby improving the sealing reliability of the through hole 110. In addition, during the installation process of the cover plate 40, the annular sealing ring 130 and the housing 30, the annular sealing ring 130 is not easy to be displaced, thereby reducing the risk of poor installation. The inside and outside of the housing 30 are reliably isolated, which is conducive to ensuring the normal operation of the powertrain 2. In addition, the two inclined mounting surfaces 100 have a larger area for sealing the through hole 110, which improves the convenience and operability of sealing the through hole 110, and is more conducive to sealing the through hole 110.

[0063] In one embodiment, the axial direction of the through hole 110 is perpendicular to the direction of gravity, and the angle between each inclined mounting surface 100 and the direction of gravity is greater than 0° and less than 90°. Figure 4 The direction of gravity is as follows Figure 4 In the embodiment of the present application, the axial direction of the through hole 110 is parallel to the horizontal direction. Each inclined mounting surface 100 is inclined relative to the horizontal direction, and the annular sealing ring 130 is not easy to fall off when placed in the annular groove 120 with an angle, thereby improving the sealing reliability of the through hole 110.

[0064] In one embodiment, the outer diameter of the annular groove 120 is smaller than the outer diameter of the inclined mounting surface 100a and smaller than the outer diameter of the inclined mounting surface 100b. The outer diameter of the annular groove 120 is smaller than the outer diameter of any inclined mounting surface 100, and the annular groove 120 includes two groove walls. The two groove walls of the annular groove 120 can limit the annular sealing ring 130 in the radial direction of the through hole 110, reduce the risk of radial displacement of the annular sealing ring 130, and improve the reliability of the annular sealing ring 130 sealing the through hole 110.

[0065] In one embodiment, the annular sealing ring 130 is elastic. The annular sealing ring 130 includes a compressed state and a natural state. Along the depth direction of the annular groove 120, the thickness of the annular sealing ring 130 in the natural state is greater than the thickness of the annular sealing ring 130 in the compressed state, and is greater than the depth of the annular groove 120. Among them, the depth direction of the annular groove 120 is the arrangement direction of the notch and the groove bottom of the annular groove 120. Before fixing the cover plate 40, the annular sealing ring 130 is in a natural state. The cover plate 40 is installed to the inclined mounting surface 100a, the annular sealing ring 130 is compressed, and the annular sealing ring 130 is converted from a natural state to a compressed state. In the embodiment of the present application, the thickness of the annular sealing ring 130 in the natural state is greater than the depth of the annular groove 120, the inclined mounting surface 100b is fixed to the inclined mounting surface 100a, and the annular sealing ring 130 can be interference fit with the two inclined mounting surfaces 100, thereby improving the sealing reliability of the through hole 110.

[0066] In one embodiment, one of the inclined mounting surface 100a and the inclined mounting surface 100b includes an annular groove 120, and the thickness of the annular sealing ring 130 in a natural state along the depth direction of the annular groove 120 is less than or equal to the depth of the annular groove 120. The other of the inclined mounting surface 100a and the inclined mounting surface 100b includes a boss, and at least part of the boss is accommodated in the annular groove 120. Among them, the groove bottom of the annular groove 120, the annular sealing ring 130 and the boss are arranged in sequence along the depth direction of the annular groove 120. In the embodiment of the present application, the cover plate 40 is mounted to the housing 30, and the boss extends into the annular groove 120 to compress the annular sealing ring 130. The annular sealing ring 130 abuts against the groove bottom and the boss of the annular groove 120 along the depth direction of the annular groove 120 to seal the two inclined mounting surfaces 100, thereby sealing the through hole 110.

[0067] In one embodiment, along the arrangement direction of the two groove walls of the annular groove 120, the width of the annular sealing ring 130 in a natural state is smaller than the spacing between the two groove walls of the annular groove 120. Among them, along the depth direction of the annular groove 120, one end of the two groove walls is connected to the groove bottom of the annular groove 120, and the other ends of the two groove walls are spaced apart to form a notch of the annular groove 120. When assembling the power assembly 2, the annular sealing ring 130 is generally installed into the annular groove 120 first, and then the cover plate 40 is fixed to the housing 30. In the embodiment of the present application, since the thickness of the annular sealing ring 130 in a natural state is smaller than the width of the annular groove 120, the annular sealing ring 130 is easy to assemble, which improves the assembly rhythm of the power assembly 2 production line.

[0068] In one embodiment, the angle between the inclined mounting surface 100b and the inclined mounting surface 100a and the axial direction of the through hole 110 is greater than 5 and less than 30. The angle between each inclined mounting surface 100 and the axial direction of the through hole 110 is greater than 5 and less than 30. In the embodiment of the present application, the angle between each inclined mounting surface 100 and the axial direction of the through hole 110 is greater than 5°, so that the annular sealing ring 130 is not easy to fall off from the annular groove 120, which reduces the difficulty of installing the annular sealing ring 130 and improves the sealing reliability of the through hole 110. The angle between each inclined mounting surface 100 and the axial direction of the through hole 110 is less than 30°, and the two inclined mounting surfaces 100 are easy to form, which is conducive to reducing the axial size of the power assembly 2 along the through hole 110.

[0069] Combined with reference Figure 3 and Figure 5 In one embodiment, the axis of the through hole 110 coincides with the axis of the motor shaft 21 of the motor 20 or the axis of the input shaft 11 of the reducer 10. The motor shaft 21 of the motor 20 is fixedly connected to the input shaft 11 of the reducer 10. In one embodiment, the axis of the motor shaft 21 of the motor 20 coincides with the axis of the input shaft 11 of the reducer 10.

[0070] In one embodiment, during the assembly process of the power assembly 2, the through hole 110 is used to accommodate the assembly shaft to pass through. The assembly shaft is used to realize the automatic assembly of the power assembly 2. After the assembly of the power assembly 2 is completed, the assembly shaft exits the through hole 110. The cover plate 40 and the annular sealing ring 130 are installed on the housing 30 to seal the through hole 110, thereby reducing the risk of lubricating oil in the housing 30 leaking through the through hole 110.

[0071] In the embodiment of the present application, the through hole 110 is coaxially arranged with the motor shaft 21 or the input shaft 11 of the reducer 10 , and the through hole 110 can be used to assist the automated assembly of the power assembly 2 , thereby improving the assembly efficiency and convenience of the power assembly 2 .

[0072] In one embodiment, the through hole 110 can also be used to transmit lubricating oil. In one embodiment, the lubricating oil can be injected into the housing 30 through the internal channel of the cover plate 40 and the through hole 110 in sequence.

[0073] Combined with reference Figure 3 and Figure 5In one embodiment, the through hole 110 is used to connect the outside of the shell 30 with the reducer cavity 31. Among them, the shell 30 includes a reducer shell, and the reducer shell is used to surround and form the reducer cavity 31. The through hole 110 is used to penetrate the reducer shell. Generally, compared with the motor shell, the reducer shell structure is simpler and has no complicated wiring. In the embodiment of the present application, the through hole 110 is connected to the reducer cavity 31, which improves the convenience and feasibility of opening the through hole 110 and reduces the adverse effects of the opening of the through hole 110 on the structure and wiring of the shell 30.

[0074] In one embodiment, the housing 30 includes an end cover 321. The outer surface of the end cover 321 includes an inclined mounting surface 100a. The inner surface of the end cover 321 is used to rotatably connect a motor shaft 21 of the motor 20 or a bearing of the input shaft 11 of the reducer 10. The axial through hole 110 passes through the inner surface and the outer surface of the end cover 321. The end cover 321 is used to form the reducer cavity 31. The outer surface of the end cover 321 and the inner surface of the end cover 321 are opposite to each other along the axial direction of the input shaft 11 of the reducer 10.

[0075] In one embodiment, the housing 30 further includes a partition plate and a circumferential housing, wherein the partition plate, the circumferential housing and the end cover 321 are arranged in sequence along the axial direction of the input shaft 11 of the reducer 10 .

[0076] In one embodiment, the end cover 321 is the end cover 321 of the reducer 10, and the partition, the circumferential shell and the end cover 321 are used to enclose and form the reducer cavity 31. The input shaft 11 of the reducer 10 is rotatably connected to the partition and the end cover 321 through two bearings. In the embodiment of the present application, the end cover 321 of the reducer 10 includes a through hole 110, and the through hole 110 has little effect on the structure and routing of the shell 30, thereby improving the operability and feasibility of opening the through hole 110.

[0077] In one embodiment, the end cover 321 is the end cover 321 of the motor 20, and the partition, the circumferential housing and the end cover 321 are used to enclose and form the motor cavity 32. The motor shaft 21 of the motor 20 is rotatably connected to the partition and the end cover 321 through two bearings. In the embodiment of the present application, the end cover 321 of the motor 20 includes a through hole 110, and the end cover 321 is relatively flat, which brings convenience to the opening of the through hole 110. The through holes 110 are arranged along the axial direction and can be used to assist the assembly of the powertrain 2.

[0078] Combined with reference Figure 3 and Figure 5In one embodiment, the diameter of the through hole 110 is less than or equal to the inner diameter of the outer ring of a bearing. The inner surface of the end cover 321 includes a bearing groove. The outer ring of a bearing is fixed to the inner circumference of a bearing groove. The inner ring of a bearing is fixed to the outer circumference of the input shaft 11 of the reducer 10. In the embodiment of the present application, the diameter of the through hole 110 is less than or equal to the inner diameter of the outer ring of the bearing, which is conducive to improving the structural strength of the end cover 321.

[0079] In one embodiment, the diameter of the through hole 110 is larger than the inner diameter of the inner ring of a bearing. In the embodiment of the present application, the through hole 110 has a larger diameter, which helps the through hole 110 to assist in assembling the power assembly 2. In addition, since the diameter of the annular sealing ring 130 is larger than the diameter of the through hole 110, the diameter of the annular sealing ring 130 is larger, which reduces the difficulty of assembling the annular sealing ring 130.

[0080] In one embodiment, the outer diameter of the inclined mounting surface 100a is greater than or equal to the outer diameter of the outer ring of a bearing. In the embodiment of the present application, the inclined mounting surface 100a can provide a larger area for fixing the inclined mounting surface 100b, which is convenient for the installation of the inclined mounting surface 100b. The larger outer diameter of the inclined mounting surface 100a can also increase the diameter of the annular sealing ring 130. The larger size of the annular sealing ring 130 is easier to fit into the annular groove 120. The opening of the annular groove 120 is also simpler.

[0081] In one embodiment, the outer diameter of the inclined mounting surface 100a is smaller than the distance between the axis of the input shaft 11 of the reducer 10 and the axis of the intermediate shaft. The intermediate shaft of the reducer 10 is used to drive and connect the input shaft 11 of the reducer 10 and the output shaft of the reducer 10. In the embodiment of the present application, the upper limit of the outer diameter of the inclined mounting surface 100a is limited, which is conducive to improving the strength of the housing 30.

[0082] In one embodiment, the difference between the outer diameter of the inclined mounting surface 100a and the diameter of the through hole 110 is greater than the difference between the inner diameter and the outer diameter of the outer ring of a bearing. In the embodiment of the present application, the inclined mounting surface 100a has a larger area for locking the inclined mounting surface 100b, which is conducive to sealing the through hole 110 and improving the sealing reliability of the through hole 110.

[0083] In one embodiment, a projection of an outer ring of a bearing along a bearing axis is located within a projection of the inclined mounting surface 100 a .

[0084] Combined with reference Figure 3 and Figure 5In one embodiment, the outer surface of the housing 30 includes an annular protrusion structure 33. For the convenience of description, an annular protrusion structure 33 is defined as an annular protrusion structure 33a. The annular protrusion structure 33a protrudes toward the inclined mounting surface 100b along the axial direction of the through hole 110. The end surface of the annular protrusion structure 33a along the axial direction of the through hole 110 facing the inclined mounting surface 100b is used to form the inclined mounting surface 100a.

[0085] The inner surface of the annular protrusion structure 33a is used to surround and form the through hole 110. In the embodiment of the present application, the annular protrusion structure 33a is protruded from the outer surface of the housing 30, which is conducive to fixing the cover plate 40 to the housing 30 and improving the convenience of assembling the cover plate 40. In addition, the annular protrusion structure 33a is more likely to form an inclined mounting surface 100a to reduce the risk of the annular sealing ring 130 falling off, thereby improving the sealing reliability of the through hole 110.

[0086] In one embodiment, the annular protrusion structure 33a includes two ends along the gravity direction, and the two ends of the annular protrusion structure 33a have different thicknesses along the axial direction of the powertrain, wherein the thickness of one end of the annular protrusion structure 33a is less than the thickness of the other end of the annular protrusion structure 33a.

[0087] In the embodiment of the present application, since the thickness of the two ends of the annular protrusion structure 33a along the gravity direction is different, the end with a larger thickness can support the annular sealing ring 130. The annular sealing ring 130 is not easy to fall off due to gravity, which is conducive to the efficient assembly of the power assembly 2 and improves the sealing reliability of the through hole 110.

[0088] In one embodiment, the thickness of one end of the annular protrusion structure 33a is the minimum thickness of the annular protrusion structure 33a. The thickness of the other end of the annular protrusion structure 33a is the maximum thickness of the annular protrusion structure 33a. In the embodiment of the present application, the thickness difference between the two ends of the annular protrusion structure 33a along the gravity direction is the largest, and the annular sealing ring 130 is less likely to fall off when the power assembly 2 is horizontally assembled.

[0089] See also Figure 6 In one embodiment, the outer surface of the housing 30 includes a plurality of mounting posts 34. The plurality of mounting posts 34 are used to fix the cover plate 40. The plurality of mounting posts 34 are sequentially arranged at intervals on the outer peripheral side of the annular protrusion structure 33a along the circumference of the through hole 110. The plurality of mounting posts 34 are arranged at intervals along the circumference of the through hole 110. Each mounting post 34 includes a mounting notch. The mounting notch is recessed from the end surface of the mounting post 34 close to the inclined mounting surface 100b toward the inner surface of the housing 30 along the axial direction of the through hole 110.

[0090] In the embodiment of the present application, a plurality of mounting posts 34 are protruded from the outer surface of the housing 30 , which is beneficial for the plurality of mounting posts 34 to fix the cover plate 40 , thereby improving the convenience of assembling the cover plate 40 .

[0091] In one embodiment, the end surface of each mounting post 34 facing the inclined mounting surface 100b along the axial direction of the through hole 110 is parallel to the inclined mounting surface 100b. The end surfaces of multiple mounting posts 34 facing the inclined mounting surface 100a along the axial direction of the through hole 110 are coplanar. Among them, the end surfaces of multiple mounting posts 34 facing the inclined mounting surface 100b are parallel to each other. In one embodiment, the end surfaces of multiple mounting posts 34 facing the inclined mounting surface 100b along the axial direction of the through hole 110 are coplanar with the end surface of the annular protrusion structure 33a facing the inclined mounting surface 100b. Coplanar means on the same plane. The end surfaces of multiple mounting posts 34 facing the inclined mounting surface 100b along the axial direction of the through hole 110 and the end surface of the annular protrusion structure 33a facing the inclined mounting surface 100b are used together to form the inclined mounting surface 100a.

[0092] In the embodiment of the present application, the end surfaces of the plurality of mounting posts 34 facing the inclined mounting surface 100 b are on the same plane, which is beneficial for the plurality of mounting posts 34 to fix the cover plate 40 , thereby improving the convenience of assembling the cover plate 40 .

[0093] Combined with reference Figure 3 and Figure 5 In one embodiment, the inner surface of the housing 30 includes another annular protrusion structure 33. For the convenience of description, the other annular protrusion structure 33 is defined as an annular protrusion structure 33b. The inner circumference of the annular protrusion structure 33b is used to fix the outer ring of a bearing of the motor shaft 21 of the motor 20 or the input shaft 11 of the reducer 10. The protrusion direction of the annular protrusion structure 33b is opposite to that of the annular protrusion structure 33a. Among them, the annular protrusion structure 33b is used to form a bearing groove of a bearing.

[0094] In the embodiment of the present application, the annular protrusion structure 33b protrudes away from the outer surface of the housing 30 along the axial direction of the through hole 110, and the annular protrusion structure 33b can fully utilize the space in the housing 30 to reduce the size of the power assembly 2. In addition, the annular protrusion structure 33b and the annular protrusion structure 33a protrude toward the inner side and the outer side of the housing 30 respectively, which is conducive to reducing the axial size of the power assembly 2.

[0095] In one embodiment, the axis of the annular protrusion structure 33b coincides with the axis of the annular protrusion structure 33a. In the embodiment of the present application, the two annular protrusion structures 33 are coaxially arranged, and the through hole 110 is coaxially arranged with the motor shaft 21 or the input shaft 11 of the reducer 10. The through hole 110 can be used to assist the automatic assembly of the power assembly 2, thereby improving the assembly efficiency and convenience of the power assembly 2.

[0096] In one embodiment, the minimum thickness of the annular protrusion structure 33a is less than the thickness of the annular protrusion structure 33b along the axial direction of the through hole 110. The end surface of the annular protrusion structure 33a facing the inclined mounting surface 100b is an inclined surface, and the minimum thickness of the annular protrusion structure 33a refers to the minimum distance between the end surface of the annular protrusion structure 33a facing the inclined mounting surface 100b and the outer surface of the housing 30.

[0097] In one embodiment, the end surface of the annular protrusion structure 33b that is away from the annular protrusion structure 33a along the axial direction of the through hole 110 is perpendicular to the axial direction of the through hole 110. The maximum thickness and the minimum thickness of the annular protrusion structure 33b are equal.

[0098] In the embodiment of the present application, since the axial end surface of the annular protrusion structure 33 a is used to form the inclined mounting surface 100 a , reducing the axial thickness of the annular protrusion structure 33 a is beneficial to reducing the axial size of the power assembly 2 .

[0099] In one embodiment, the bottom of the bearing groove includes a through hole, and the through hole is used to connect with the through hole 110. The aperture of the through hole is smaller than the aperture of the through hole 110. The annular protrusion structure 33b is used to form the groove wall of the bearing groove. The through hole penetrates the bottom of the bearing groove along the axial direction of the through hole 110. The through hole is also used to connect with the interior of the housing 30. The through hole and the through hole 110 are arranged along the axial direction of the through hole 110.

[0100] In the embodiment of the present application, the bottom of the bearing groove between the inner circumferential surface of the bottom of the bearing groove along the radial direction of the through hole 110 and the inner circumferential surface of the annular protrusion structure 33a can be used to abut against the inner ring of a bearing. The inner diameter of the annular protrusion structure 33a is large, which is conducive to increasing the size of the annular sealing ring 130 and is more conducive to the assembly of the annular sealing ring 130.

[0101] In one embodiment, the inclined mounting surface 100a includes an annular groove 120. The inclined mounting surface 100a includes two ends along the gravity direction. The height of one end of the inclined mounting surface 100a along the gravity direction is greater than the height of the other end of the inclined mounting surface 100a. The distance between one end of the inclined mounting surface 100a and the inner surface of the shell 30 along the axial direction of the through hole 110 is smaller than the distance between the other end of the inclined mounting surface 100a and the inner surface of the shell 30. The annular groove 120 is recessed from the inclined mounting surface 100a away from the inclined mounting surface 100b. The annular sealing ring 130 is installed in the annular groove 120 of the inclined mounting surface 100a. Figure 4 As shown in FIG. 1 , the inclined mounting surface 100 a is inclined from the upper left to the lower right. The inclined mounting surface 100 b is inclined from the upper left to the lower right.

[0102] In the embodiment of the present application, the inclined form of the inclined mounting surface 100a enables the annular sealing ring 130 to be installed in the annular groove 120. Under the action of gravity, the annular sealing ring 130 is not easy to fall off, thereby improving the assembly efficiency of the power assembly 2 and the sealing reliability of the through hole 110. In addition, since the annular groove 120 is provided on the inclined mounting surface 100a, the cover plate 40 is easy to observe during assembly, reducing the risk of displacement and falling off of the annular sealing ring 130. Figure 3 As shown, the left side of the inclined mounting surface 100a is integrated with the motor controller, the motor 20, the reducer 10 and other components, and the line of sight from left to right is blocked. However, there are no other components on the right side of the cover plate 40, and the assembly of the cover plate 40 is easy to observe from right to left.

[0103] In one embodiment, the outer surface of the cover plate 40 is opposite to the inclined mounting surface 100b along the axial direction of the through hole 110. The inclined mounting surface 100b includes an annular groove 120. The inclined mounting surface 100b includes two ends along the gravity direction. The height of one end of the inclined mounting surface 100b along the gravity direction is greater than the height of the other end of the inclined mounting surface 100b. The distance between one end of the inclined mounting surface 100b and the outer surface of the cover plate 40 along the axial direction of the through hole 110 is less than the distance between the other end of the inclined mounting surface 100b and the outer surface of the cover plate 40.

[0104] The inner surface of the cover plate 40 includes an inclined mounting surface 100 b. The annular groove 120 is recessed from the inner surface toward the outer surface of the cover plate 40. The annular sealing ring 130 is installed in the annular groove 120 of the cover plate 40.

[0105] In the embodiment of the present application, the inclined form of the inclined mounting surface 100b allows the annular sealing ring 130 to be installed in the annular groove 120. Under the action of gravity, the annular sealing ring 130 is not easy to fall off, thereby improving the assembly efficiency of the powertrain 2 and the sealing reliability of the through hole 110.

[0106] In one embodiment, the angle between the bottom of the annular groove 120 and the axial direction of the through hole 110 is greater than 0 and less than 90. The area of ​​the bottom of the annular groove 120 is greater than the area of ​​the projection of the bottom of the annular groove 120 along the axial direction of the through hole 110. In the embodiment of the present application, the bottom of the annular groove 120 is inclined relative to the axial direction of the through hole 110, which is conducive to reducing the maximum depth of the annular groove 120 and facilitating the opening of the annular groove 120.

[0107] See also Figure 5 In one embodiment, the bottom of the annular groove 120 is parallel to the inclined mounting surface 100a or the inclined mounting surface 100b. In the embodiment of the present application, the bottom of the annular groove 120 is parallel to any inclined mounting surface 100, which is beneficial to reduce the maximum depth of the annular groove 120 and facilitate the opening of the annular groove 120.

[0108] In one embodiment, the depth of the annular groove 120 along the axial direction of the annular groove 120 is less than or equal to the width of the annular groove 120 along the radial direction of the annular groove 120. The axial direction of the annular groove 120 is the depth direction of the annular groove 120, that is, the arrangement direction of the notch and the groove bottom of the annular groove 120. The depth direction of the annular groove 120 is perpendicular to the inclined mounting surface 100a and the inclined mounting surface 100b. The depth direction of the annular groove 120 intersects with the axial direction of the through hole 110. The radial width of the annular groove 120 refers to the distance between the two groove walls of the annular groove.

[0109] In the embodiment of the present application, the width of the annular groove 120 is greater than the depth of the annular groove 120. When the annular sealing ring 130 is assembled into the annular groove 120, the annular sealing ring 130 is easily assembled due to the larger width of the annular groove 120, thereby improving the assembly efficiency of the power assembly 2.

[0110] The powertrain and electric vehicle with an inclined mounting surface provided in the embodiments of the present application are introduced in detail above. Specific examples are used herein to illustrate the principles and embodiments of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present application, there will be changes in the specific embodiments and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A power assembly with an inclined mounting surface, characterized in that: The power assembly includes a motor and a reducer, and the housing of the power assembly includes at least one of a motor cavity and a reducer cavity, wherein the motor cavity is used to fix the stator of the motor, and the reducer cavity is used to accommodate multiple gears of the reducer, wherein: The outer surface of the housing includes an inclined mounting surface, the inclined mounting surface includes a through hole, the through hole is used to connect the outside of the housing with the motor cavity or the reducer cavity, the inclined mounting surface is used to fix a cover plate, the cover plate includes another inclined mounting surface, the another inclined mounting surface and the inclined mounting surface have the same axial angle with the through hole, and the value of the angle is greater than 0 and less than 90; At least one of the one inclined mounting surface and the other inclined mounting surface includes an annular groove, the annular groove is used to accommodate an annular sealing ring, and the annular sealing ring is used to cooperate with the one inclined mounting surface and the other inclined mounting surface to seal the through hole.

2. The powertrain according to claim 1, characterized in that: The value of the angle between the other inclined mounting surface, the one inclined mounting surface and the axial direction of the one through hole is greater than 5 and less than 30.

3. The powertrain according to claim 1, characterized in that: The axis of the one through hole coincides with the axis of the motor shaft of the motor or the axis of the input shaft of the reducer.

4. The powertrain according to claim 1, characterized in that: The one through hole is used to connect the outside of the housing with the one reducer cavity.

5. The powertrain according to claim 3, characterized in that: The housing includes an end cover, the outer surface of the end cover includes the inclined mounting surface, and the inner surface of the end cover is used for rotatably connecting a motor shaft of the motor or a bearing of the input shaft of the reducer, wherein: The one through hole penetrates the inner surface and the outer surface of the one end cover along the axial direction of the one through hole; The diameter of the through hole is less than or equal to the inner diameter of the outer ring of the one bearing; The outer diameter of the inclined mounting surface is greater than or equal to the outer diameter of the outer ring of the bearing.

6. The powertrain according to any one of claims 1 to 5, characterized in that: The outer surface of the housing includes an annular protrusion structure, the annular protrusion structure protrudes toward the other inclined mounting surface along the axial direction of the one through hole, and the end surface of the annular protrusion structure facing the other inclined mounting surface along the axial direction of the one through hole is used to form the one inclined mounting surface, wherein: The annular protrusion structure includes two ends along the gravity direction, and the two ends of the annular protrusion structure have different thicknesses along the axial direction of the power assembly.

7. The powertrain according to claim 6, characterized in that: The outer surface of the housing includes a plurality of mounting posts, the plurality of mounting posts are used to fix the one cover plate, and the plurality of mounting posts are sequentially spaced along the circumference of the one through hole on the outer peripheral side of the one annular protrusion structure, wherein: The end surface of each mounting post along the axial direction of the one through hole facing the other inclined mounting surface is parallel to the other inclined mounting surface; The end surfaces of the plurality of mounting posts along the axial direction of the one through hole facing the other inclined mounting surface are coplanar.

8. The powertrain according to claim 6, characterized in that: The inner surface of the housing includes another annular protrusion structure, the inner circumference of which is used to fix the outer ring of a bearing of the motor shaft of the motor or the input shaft of the reducer, wherein: The axis of the other annular protrusion structure coincides with the axis of the one annular protrusion structure; The protrusion direction of the another annular protrusion structure is opposite to that of the one annular protrusion structure; Along the axial direction of the one through hole, the minimum thickness of the one annular protrusion structure is smaller than the thickness of the other annular protrusion structure.

9. The power assembly according to any one of claims 1-5, 7-8, characterized in that: The one inclined mounting surface includes the one annular groove, and the one inclined mounting surface includes two ends along the gravity direction, wherein: Along the gravity direction, the height of one end of the one inclined mounting surface is greater than the height of the other end of the one inclined mounting surface; Along the axial direction of the through hole, the distance between the one end of the inclined mounting surface and the inner surface of the shell is smaller than the distance between the other end of the inclined mounting surface and the inner surface of the shell.

10. The power assembly according to any one of claims 1-5, 7-8, characterized in that: The outer surface of the cover plate is opposite to the other inclined mounting surface along the axial direction of the one through hole, the other inclined mounting surface includes the one annular groove, and the other inclined mounting surface includes two ends along the gravity direction, wherein: Along the gravity direction, the height of one end of the other inclined mounting surface is greater than the height of the other end of the other inclined mounting surface; Along the axial direction of the one through hole, the distance between the one end of the other inclined mounting surface and the outer surface of the cover plate is smaller than the distance between the other end of the other inclined mounting surface and the outer surface of the cover plate.

11. The power assembly according to any one of claims 1-5, 7-8, characterized in that: The inner diameter of the annular groove is greater than the diameter of the through hole; The outer diameter of the one annular groove is smaller than the outer diameter of the one inclined mounting surface, and smaller than the outer diameter of the other inclined mounting surface.

12. The power assembly according to any one of claims 1-5, 7-8, characterized in that: The angle between the bottom of the annular groove and the axial direction of the through hole is greater than 0 and less than 90; A groove bottom of the one annular groove is parallel to the one inclined mounting surface or the other inclined mounting surface.

13. The power assembly according to any one of claims 1-5, 7-8, characterized in that: A depth of the annular groove along an axial direction of the annular groove is less than or equal to a width of the annular groove along a radial direction of the annular groove.

14. The powertrain according to claim 6, characterized in that: The one inclined mounting surface includes the one annular groove, and the one inclined mounting surface includes two ends along the gravity direction, wherein: Along the gravity direction, the height of one end of the one inclined mounting surface is greater than the height of the other end of the one inclined mounting surface; Along the axial direction of the through hole, the distance between the one end of the inclined mounting surface and the inner surface of the shell is smaller than the distance between the other end of the inclined mounting surface and the inner surface of the shell.

15. The powertrain according to claim 6, characterized in that: The outer surface of the cover plate is opposite to the other inclined mounting surface along the axial direction of the one through hole, the other inclined mounting surface includes the one annular groove, and the other inclined mounting surface includes two ends along the gravity direction, wherein: Along the gravity direction, the height of one end of the other inclined mounting surface is greater than the height of the other end of the other inclined mounting surface; Along the axial direction of the one through hole, the distance between the one end of the other inclined mounting surface and the outer surface of the cover plate is smaller than the distance between the other end of the other inclined mounting surface and the outer surface of the cover plate.

16. The powertrain according to claim 6, characterized in that: The inner diameter of the annular groove is greater than the diameter of the through hole; The outer diameter of the one annular groove is smaller than the outer diameter of the one inclined mounting surface, and smaller than the outer diameter of the other inclined mounting surface.

17. The powertrain according to claim 6, characterized in that: The angle between the bottom of the annular groove and the axial direction of the through hole is greater than 0 and less than 90; A groove bottom of the one annular groove is parallel to the one inclined mounting surface or the other inclined mounting surface.

18. The powertrain according to claim 6, characterized in that: A depth of the annular groove along an axial direction of the annular groove is less than or equal to a width of the annular groove along a radial direction of the annular groove.

19. An electric vehicle, characterized in that: The electric vehicle comprises wheels, a battery pack and a powertrain as described in any one of claims 1 to 18, wherein the powertrain is used to receive power from the battery pack and drive the wheels.

Images