Power assembly and electric vehicle

Abstract

The utility model provides a power assembly and an electric vehicle, the power assembly comprises a driving motor and a speed reducer, a main shell of the power assembly comprises a motor shell and a motor end cover, the motor end cover comprises two side faces, the two side faces are opposite in the axial direction of the power assembly, and one side face is used for enclosing the motor shell to form a motor cavity. The other side face comprises an arc-shaped protrusion, the arc-shaped protrusion protrudes away from one side face in the axial direction of the power assembly, so that the arc-shaped protrusion protrudes towards the auxiliary frame in the axial direction of the power assembly, the arc-shaped protrusion comprises a suspension hole, and an opening of the suspension hole faces away from one side face in the axial direction of the power assembly. The distance between the suspension hole formed in the arc-shaped protrusion and the auxiliary frame is closer, the suspension hole is used for directly fixing one auxiliary frame of the electric vehicle, use of an adapter bracket can be reduced, the assembling process is simplified, and the fixing stability between the power assembly and the auxiliary frame is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric vehicles, in particular to a power assembly and an electric vehicle. BACKGROUND

[0002] The suspension system in the electric vehicle is used to support the driving motor, and at present, the driving motor of the power assembly and the subframe of the electric vehicle are mainly fixed by using an adapter support. Not only is the assembly space reserved for assembling the adapter support, but also the adapter support is prone to breaking, the assembly process is complex, and the assembly operability of the whole vehicle is poor. CONTENT OF THE UTILITY MODEL

[0003] The present application provides a power assembly and an electric vehicle to improve the stability of the power assembly installed on the subframe and reduce the installation space.

[0004] In a first aspect, the present application provides a power assembly, which includes a driving motor and a reducer. The total housing of the power assembly includes a motor housing and a motor end cover. The motor end cover includes two sides, which are opposite along the axial direction of the power assembly. One side is used to enclose the motor housing to form a motor cavity. The motor cavity is used to accommodate the stator and rotor of the driving motor. The motor shaft of the driving motor is used to drive the input shaft of the reducer. The other side includes an arc-shaped protrusion, which protrudes away from the one side along the axial direction of the power assembly. The arc-shaped protrusion includes a suspension hole, the opening of which faces away from the one side along the axial direction of the power assembly. The suspension hole is used to directly fix a subframe of an electric vehicle.

[0005] In the embodiment of the present application, the other side of the motor end cover includes an arc-shaped protrusion, which protrudes away from the one side along the axial direction of the power assembly, so that the arc-shaped protrusion is closer to the subframe. The arc-shaped protrusion includes a suspension hole, so that the distance between the suspension hole formed in the arc-shaped protrusion and the subframe is closer, and the suspension hole can be directly fixed to the subframe.

[0006] In the embodiment of the present application, the arc-shaped protrusion refers to its extension along the circumferential direction of the power assembly. The circumferential distribution of each part of the arc-shaped protrusion makes the motor end cover have high structural strength.

[0007] In this embodiment, the opening of a mounting hole faces away from one side along the powertrain axial direction, such that the opening of the mounting hole faces the subframe along the powertrain axial direction. This allows the subframe to be directly fixed to the mounting hole from the outside of the subframe along the powertrain axial direction using bolts, simplifying the assembly process. Compared to using an adapter bracket for indirect fixing to the subframe, directly fixing the subframe to a mounting hole with an arc-shaped protrusion on the motor end cover reduces the need for adapter brackets, enhancing the stability of the powertrain mounted on the subframe and making installation more convenient.

[0008] In this embodiment, a motor end cap directly fixes the subframe, which can also reduce the axial space required when fixing the powertrain to the subframe, making the overall axial dimension of the powertrain smaller after it is fixed to the subframe, which is beneficial to optimizing the layout of the powertrain in the vehicle.

[0009] In this embodiment, a motor end cap is directly fixed to the subframe, and the length of the arc-shaped protrusion along the axial direction of the powertrain is smaller than that of the adapter bracket. Alternatively, the powertrain is fixed to a subframe of the same size. In the scheme of directly fixing the powertrain to the subframe via an arc-shaped protrusion of a motor end cap in this application, the arc-shaped protrusion has a smaller axial length than the adapter bracket, which allows the axial length of the powertrain fixed to the subframe of the same size to be larger. This can increase the volume of the drive motor or reducer in the powertrain, thereby improving the power performance of the powertrain.

[0010] In this embodiment of the application, an arc-shaped protrusion is integrally formed on a motor end cover, which makes the overall structure of the motor end cover stronger and less vibrating. The use of the adapter bracket is eliminated, and the vibration noise generated between the adapter bracket and the drive motor during the operation of the electric vehicle can also be avoided, which is beneficial to improving the NVH performance of the electric vehicle.

[0011] In this embodiment, an arc-shaped protrusion is formed on the side of a motor end cover opposite to the stator of the drive motor, causing the arc-shaped protrusion to bulge towards the subframe along the powertrain axis. This brings the distance between the mounting hole formed on the arc-shaped protrusion and the subframe closer, allowing the motor end cover to be directly fixed to the subframe. This reduces the use of adapter brackets, simplifies the assembly process, and reduces the overall axial dimensions of the powertrain and subframe. The arc-shaped protrusion also increases the structural strength of the motor end cover, resulting in a more stable fixation between the motor end cover and the subframe, which is beneficial for improving the NVH performance of the electric vehicle.

[0012] In one embodiment, an arcuate protrusion includes two ends arranged opposite each other along the circumference of the powertrain, the length of the arcuate protrusion along the axial direction of the powertrain increases and then decreases from one end to the other, and the length of the arcuate protrusion portion containing a suspension hole along the axial direction of the powertrain is greater than the length of either end along the axial direction of the powertrain.

[0013] In the embodiments of this application, an arc-shaped protrusion includes two ends arranged opposite each other along the circumference of the powertrain. The arc-shaped protrusion is arranged along the circumference of the powertrain so that it can make full use of the space on the other side of a motor end cover, making it easier to form a larger arc-shaped protrusion, and making the direct fixed connection between a motor end cover and the subframe more stable.

[0014] In this embodiment, a mounting hole is formed between two opposite ends of an arc-shaped protrusion arranged circumferentially along the powertrain. The axial length of the arc-shaped protrusion along the powertrain first increases and then decreases from one end to the other. This allows for a greater axial thickness of the arc-shaped protrusion at the location where the mounting hole is formed, ensuring that the mounting hole of the motor end cover can be directly fixed to the subframe. The smaller axial thickness at both ends of the arc-shaped protrusion contributes to weight reduction of the motor end cover. Furthermore, the forces acting on the arc-shaped protrusion can be better distributed circumferentially along the powertrain to the motor end cover, enhancing its structural strength. The fact that the axial length of the arc-shaped protrusion along the powertrain first increases and then decreases from one end to the other also reduces the die-casting difficulty of the arc-shaped protrusion.

[0015] In this embodiment, the length of the arc-shaped protrusion containing a suspension hole along the axial direction of the powertrain is greater than the length of either end along the axial direction of the powertrain, so that a suspension hole can be formed in an arc-shaped protrusion with a larger axial length, and so that a suspension hole of a motor end cover can be closer to the subframe and directly fixed to the subframe.

[0016] In one embodiment, an arcuate protrusion includes two sides arranged opposite each other along the radial direction of the powertrain, the length of the arcuate protrusion along the axial direction of the powertrain increases and then decreases from one side to the other, and a suspension hole is arranged between the two sides along the radial direction of the powertrain.

[0017] In this embodiment, the length of an arc-shaped protrusion along the axial direction of the powertrain increases and then decreases from one side to the other, forming an arc surface on the surface of the arc-shaped protrusion facing away from one side. The curvature of the arc surface faces a motor housing. The arc surface allows for a more even distribution of the force on the arc-shaped protrusion, thereby increasing the structural strength of the arc-shaped protrusion and the motor end cover. The fact that the length of the arc-shaped protrusion along the axial direction of the powertrain increases and then decreases from one side to the other also reduces the die-casting difficulty of the arc-shaped protrusion.

[0018] In this embodiment, a suspension hole is arranged between the two sides along the radial direction of the powertrain, so that a suspension hole can be formed at a position with a large axial length of an arc-shaped protrusion, so that a suspension hole of a motor end cover can be directly fixed to the subframe.

[0019] In one embodiment, one side includes a bearing groove for fixing the outer ring of a bearing, the inner ring of a bearing is fixed to the motor shaft of a drive motor, and a motor end cover includes a through hole that extends through the bottom of the bearing groove and the other side along the axial direction of the powertrain. The arcuate protrusion containing a suspension hole has a radial length greater than the distance between the arcuate protrusion and the through hole.

[0020] In this embodiment, the length of the arc-shaped protrusion where a suspension hole is located along the radial direction of the powertrain is greater than the distance between the arc-shaped protrusion and a through hole. The large length of the arc-shaped protrusion where a suspension hole is located along the radial direction of the powertrain results in a larger size of the arc-shaped protrusion along the radial direction of the powertrain on the motor end cover, thereby ensuring that the motor end cover has strong structural strength. It also allows the arc-shaped protrusion to form a suspension hole, making the motor end cover more securely fixed to the subframe.

[0021] In one embodiment, the other side also includes a mounting boss, which is fixed to an arcuate raised surface and protrudes from the arcuate raised surface away from a side. The mounting boss includes a mounting surface that is planar, a mounting hole that extends through the mounting surface along the axial direction of the powertrain, and the mounting surface that contacts a subframe when a subframe is fixed in the mounting hole.

[0022] In this embodiment, an arc-shaped protrusion extends circumferentially along the powertrain, resulting in a relatively long circumferential length. However, this also reduces the contact area between the arc-shaped protrusion and the subframe. A mounting boss is fixed to the surface of the arc-shaped protrusion, protruding away from a side protrusion. The mounting surface of the mounting boss is flat, which increases the contact area between the arc-shaped protrusion and the subframe during installation, making the mounting hole of the arc-shaped protrusion more securely fixed to the subframe. The mounting boss enhances the structural strength of the motor end cover, ensuring both its structural strength and the stability of its installation with the subframe, thereby comprehensively improving the overall strength of the powertrain and subframe.

[0023] In this embodiment, by forming a mounting boss on an arc-shaped protrusion, and a mounting hole penetrating the mounting surface of the mounting boss along the axial direction of the powertrain, compared to directly fixing through only a mounting hole, the support force of the fixation can be increased, the deformation of the arc-shaped protrusion can be reduced, and the modality of the arc-shaped protrusion can be improved.

[0024] In one embodiment, one side includes a groove recessed along the axial direction of the powertrain toward an arcuate protrusion. The distance between the bottom of the groove and the surface of the arcuate protrusion along the axial direction of the powertrain is less than the length of the arcuate protrusion.

[0025] In this embodiment, one side includes a groove that is recessed toward an arc-shaped protrusion along the axial direction of the powertrain. This allows for weight reduction of the motor end cover while ensuring that a suspension hole is arranged on the arc-shaped protrusion with a large axial length. It also saves materials and reduces production costs.

[0026] In this embodiment, the distance between the bottom of the groove along the axial direction of the powertrain and the surface of an arc-shaped protrusion is less than the length of the arc-shaped protrusion, which reduces the weight of a motor end cover while allowing the arc-shaped protrusion to be directly and stably fixed to the subframe.

[0027] In one embodiment, the powertrain housing further includes a reducer housing, which is arranged adjacent to a motor housing along the axial direction of the powertrain. The reducer housing accommodates a gear shaft assembly of the reducer and includes an output shaft bore for accommodating a half-shaft for drive connection to a wheel. The outer peripheral wall of the reducer housing includes another mounting hole for securing a subframe. Along the radial direction of the powertrain, a motor housing, an output shaft bore, and the other mounting hole are arranged sequentially at intervals. The opening of the other mounting hole faces away from the motor housing along the radial direction of the powertrain.

[0028] In this embodiment, a reducer housing and a motor housing are arranged adjacent to each other along the axial direction of the powertrain. Each reducer housing includes an output shaft hole for accommodating a half-shaft, which is used to drive a wheel. This allows the input shaft of the reducer, after receiving power from the motor shaft of a drive motor, to transmit the power to the wheel through the half-shaft in the output shaft hole of the reducer housing, thus driving the electric vehicle. In one embodiment, the motor housing and the reducer housing are integrally die-cast, resulting in a stronger overall housing structure for the powertrain.

[0029] In this embodiment, the outer peripheral wall of a reducer housing includes another mounting hole for fixing the subframe. A motor housing, an output shaft hole, and another mounting hole are arranged sequentially at intervals along the radial direction of the powertrain, thereby forming another mounting hole on the side of the output shaft hole of a reducer housing opposite to the motor housing for directly fixing the subframe. This allows both the drive motor and the reducer of the powertrain to be directly fixed to the subframe, making the fixing of the powertrain to the subframe more stable.

[0030] In this embodiment, the opening of another mounting hole along the radial direction of the powertrain is away from one of the motor housings, so that the other mounting hole can be directly fixed to the subframe by bolts passing through the powertrain radially from the outside of the subframe, making installation more convenient.

[0031] In one embodiment, the distance between another mounting hole and one mounting hole along the radial direction of the powertrain is greater than the distance between the other mounting hole and the axis of the motor shaft.

[0032] In this embodiment, the distance between the other mounting hole and the first mounting hole along the radial direction of the powertrain is greater than the distance between the other mounting hole and the axis of the motor shaft. This makes the other mounting hole of the reducer housing and the mounting hole of the motor end cover arranged on both sides of the axis of the motor shaft, making the fixing position between the powertrain and the subframe more uniform, and making the support force of the subframe on the powertrain more balanced, which is conducive to making the fixing of the powertrain and the subframe more balanced and stable.

[0033] In one embodiment, the powertrain housing further includes a connecting plate that encloses a portion of the outer wall of a motor housing and a portion of the outer wall of a reducer housing to form an electrical control slot, which accommodates functional components of a motor controller. Another mounting hole is located on the side of the connecting plate opposite to the portion of the outer wall of the reducer housing.

[0034] In this embodiment, the connecting plate encloses a portion of the outer wall of a motor housing and a portion of the outer wall of a reducer housing to form an electrical control slot. By reusing the outer walls of both housings, the slot walls are not excessively occupied by the electrical control slot, thus reducing the overall size of the housing and facilitating the powertrain's layout within the vehicle. Furthermore, it fully utilizes the space between the motor housing and the reducer housing, resulting in a more compact overall powertrain housing layout.

[0035] In this embodiment, another mounting hole is arranged on the side of the connecting plate away from the outer wall of a reducer housing, such that along the height direction of the powertrain, another mounting hole of a reducer housing is arranged below the electronic control slot, thereby utilizing the space below the electronic control slot to fix it to the subframe, making the arrangement of the powertrain and the subframe more compact, which is beneficial to optimizing the layout of the powertrain and the subframe in the whole vehicle.

[0036] In one embodiment, a motor housing, a reducer housing, and a connecting plate are integrally formed, resulting in greater overall strength of the powertrain housing.

[0037] In one embodiment, a connecting plate includes a base plate, and the base plate includes two sub-plates. One sub-plate is arranged axially adjacent to a reducer housing along the powertrain, and the other sub-plate is arranged radially adjacent to a reducer housing along the powertrain. The two sub-plates form part of the bottom of an electrical control slot. The outer peripheral wall of one reducer housing also includes another mounting boss. Along the radial direction of the powertrain, the other mounting boss protrudes away from an output shaft hole. Along the circumferential direction of the powertrain, another mounting boss is arranged on one side of the outer wall of the other sub-plate away from the reducer housing. Another mounting hole is formed in the other mounting boss.

[0038] In this embodiment, another sub-plate is arranged radially adjacent to a reducer housing along the powertrain. This other sub-plate forms the bottom of the electrical control slot, expanding its radial space and providing more room to accommodate the functional components of the motor controller. Another mounting boss is arranged circumferentially on the other sub-plate on the side of the outer wall of the reducer housing, allowing it to fully utilize the space below the other sub-plate along the circumference of the powertrain.

[0039] In this embodiment, another mounting hole is formed on another mounting boss, which can enhance the fixing stability of the other mounting hole and the subframe. In addition, the other mounting boss protrudes away from an output shaft hole along the powertrain radial direction, so that the other mounting hole formed in the other mounting boss can be closer to the subframe, which facilitates the fitting and installation of the other mounting hole and the subframe.

[0040] In one embodiment, the length of the other mounting boss protruding along the radial direction of the powertrain is less than the length of the other sub-plate. This ensures that the additional mounting boss does not occupy additional space beyond the radial direction of the electrical control slot along the powertrain, thus contributing to a smaller powertrain size.

[0041] In one embodiment, the powertrain further includes another drive motor and another reducer, arranged between the first and second drive motors. The overall housing of the powertrain also includes another motor housing and another motor end cover. One side of the other motor end cover encloses the other motor housing to form another motor cavity, which accommodates the stator and rotor of the other drive motor. Another side of the other motor end cover includes another arcuate protrusion. This arcuate protrusion on the other side of the other motor end cover has the same structure as an arcuate protrusion on the first motor end cover, and the arcuate protrusion on the other side of the other motor end cover is aligned with the arcuate protrusion on the first motor end cover along the axial direction of the powertrain.

[0042] In this embodiment, a reducer and another reducer are arranged between a drive motor and another drive motor, so that one motor end cover of one drive motor and another motor end cover of the other drive motor can be arranged opposite to each other along the axial direction of the powertrain, and one arc-shaped protrusion of one motor end cover and another arc-shaped protrusion of the other motor end cover can also be arranged opposite to each other along the axial direction of the powertrain, so that the fixing of one arc-shaped protrusion and another arc-shaped protrusion to the subframe is more balanced and stable.

[0043] In this embodiment, the other arc-shaped protrusion on the other side of the other motor end cover has the same structure as the arc-shaped protrusion on the first motor end cover. The other arc-shaped protrusion on the side of the other motor end cover is aligned with the arc-shaped protrusion on the first motor end cover along the axial direction of the powertrain, making the arrangement of the powertrain more regular. It also makes the force for fixing the powertrain and the subframe balanced along the axial direction of the powertrain, making the direct fixing of the powertrain and the subframe more stable, thereby comprehensively improving the overall structural strength of the powertrain and the subframe.

[0044] In one embodiment, the powertrain housing further includes an intermediate housing arranged axially between a motor housing and another motor housing. The intermediate housing includes two sides, each side including a reducer receiving slot for receiving a portion of a gear from a reducer. The outer walls of the peripheral walls of the two reducer receiving slots include at least one fixing hole for securing a wiring harness.

[0045] In this embodiment of the application, an intermediate housing along the axial direction of the powertrain is arranged between one motor housing and another motor housing. The intermediate housing includes two sides, each side of the intermediate housing includes a reducer receiving groove. Each reducer receiving groove is used to receive a part of a gear of the reducer, such that the groove peripheral wall of each reducer receiving groove has a large length along the axial direction of the powertrain, thereby allowing the outer wall of the groove peripheral wall of the two reducer receiving grooves to have space to form at least one fixing hole.

[0046] In this embodiment, the mounting holes are used to secure wiring harnesses, including those for the powertrain's internal oil pump. The mounting holes can also be used to secure acoustic enclosures, simplifying the powertrain mounting process. These acoustic enclosures are used to reduce powertrain noise. The mounting holes in the intermediate housing can mate with mounting holes on one motor end cover, another motor end cover, another gearbox housing, and another gearbox housing to securely fix the powertrain to the subframe.

[0047] In one embodiment, an outer peripheral surface of an intermediate housing includes a receiving groove, the recess of which faces the gap between one reducer and another reducer. The receiving groove is used to house an electrical component for receiving direct current (DC) power from a power battery and for supplying DC power to the motor controllers of one drive motor and the other drive motor, respectively. At least one fixing hole is arranged on the outer side of one receiving groove.

[0048] In this embodiment, the recessed direction of the receiving groove is toward the gap between one reducer and another reducer, so that the space between the gear shaft assembly of one reducer and another reducer is fully utilized. The receiving groove is used to accommodate an electrical component, so that some functional components of the motor controller can be placed in the receiving groove, thereby reducing the space required for the electrical control groove to accommodate the functional components of the motor controller, thereby reducing the volume of the electrical control groove, and further reducing the volume of the overall powertrain housing, thus optimizing the layout of the powertrain in the vehicle.

[0049] In this embodiment, at least one fixing hole is arranged on the outside of the receiving groove, making it easier to fix the fixing hole to the external component.

[0050] In one embodiment, an intermediate housing further includes two side plates spaced apart circumferentially along the powertrain. Each side plate is fixedly connected to the outer wall of one reducer receiving slot and the outer wall of the other reducer receiving slot. The two side plates enclose a portion of the outer wall of one reducer receiving slot and a portion of the outer wall of the other reducer receiving slot to form a receiving slot. At least one fixing hole is arranged circumferentially along the powertrain on the side of either side plate opposite to the outer wall of a portion of the reducer receiving slot.

[0051] In this embodiment, two side plates are used to enclose a portion of the outer wall of one reducer receiving slot and a portion of the outer wall of another reducer receiving slot to form a receiving slot. The formation of the receiving slot reuses a portion of the outer wall of the reducer receiving slot and a portion of the outer wall of the reducer receiving slot, which makes the integration of the intermediate housing higher and the stability stronger. It also ensures that the receiving slot does not occupy additional space of the reducer receiving slot and the reducer receiving slot along the radial direction of the powertrain, thus reducing the volume of the overall housing of the powertrain.

[0052] In this embodiment of the application, at least one fixing hole is arranged along the circumference of the powertrain on the side of any side plate opposite to the outer side of a portion of the groove wall of a reducer receiving groove, such that the fixing hole is located on the outside of the receiving groove, which facilitates the fixing hole to be fixedly connected to external components.

[0053] Secondly, this application provides an electric vehicle, which includes a frame, a power battery, and a powertrain as described in the first aspect. The frame is used to fix the power battery and the powertrain. The power battery is used to drive a drive motor of the powertrain. The drive motor is used to drive the wheels through a reducer.

[0054] The powertrain in this embodiment includes a motor end cover. Another side of the motor end cover includes an arc-shaped protrusion. This arc-shaped protrusion protrudes away from one side along the axial direction of the powertrain, causing it to protrude towards the subframe along the axial direction of the powertrain. This brings the mounting holes formed on the arc-shaped protrusion closer to the subframe, allowing the motor end cover to be directly fixed to the subframe, reducing the need for adapter brackets and simplifying the assembly process. The arc-shaped protrusion also increases the structural strength of the motor end cover, resulting in a more stable fixation between the motor end cover and the subframe, thereby improving the overall vehicle reliability. Attached Figure Description

[0055] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the embodiments of this application will be described below.

[0056] Figure 1 This is a schematic diagram of an electric vehicle provided in an embodiment of this application;

[0057] Figure 2This is a schematic diagram of a powertrain and subframe provided in an embodiment of this application;

[0058] Figure 3 This is a schematic diagram of a powertrain provided in an embodiment of this application;

[0059] Figure 4 This is another schematic diagram of the powertrain provided in the embodiments of this application;

[0060] Figure 5 This is an exploded view of the overall casing provided in an embodiment of this application;

[0061] Figure 6 This is a schematic diagram of a motor end cover provided in an embodiment of this application;

[0062] Figure 7 This is another schematic diagram of the motor end cover provided in an embodiment of this application;

[0063] Figure 8 This is a cross-sectional view of the motor end cover provided in an embodiment of this application;

[0064] Figure 9 This is a schematic diagram of the overall housing provided in an embodiment of this application;

[0065] Figure 10 This is another schematic diagram of the overall housing provided in the embodiments of this application;

[0066] Figure 11 This is a schematic diagram of an intermediate shell provided in an embodiment of this application;

[0067] Figure 12 This is a cross-sectional view of a powertrain provided in an embodiment of this application. Detailed Implementation

[0068] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0069] For ease of understanding, the English abbreviations and related technical terms used in the embodiments of this application will be explained and described below.

[0070] NVH is an abbreviation for Noise, Vibration, and Harshness, which refers to noise, vibration, and acoustic roughness.

[0071] This application provides a powertrain including a drive motor and a reducer. The powertrain's main housing includes a motor housing and a motor end cover. The motor end cover has two sides facing each other along the axial direction of the powertrain. One side encloses the motor housing to form a motor cavity, which accommodates the stator and rotor of the drive motor. The motor shaft of the drive motor is used to drively connect to the input shaft of the reducer. The other side includes an arc-shaped protrusion that protrudes away from the first side along the axial direction of the powertrain. The arc-shaped protrusion includes a mounting hole with its opening facing away from the first side along the axial direction of the powertrain. The mounting hole is used to directly fix a subframe of the electric vehicle.

[0072] In this embodiment, the other side of the motor end cover includes an arc-shaped protrusion. This arc-shaped protrusion protrudes away from one side along the powertrain axial direction, causing it to protrude towards the subframe along the powertrain axial direction. This brings the mounting hole formed on the arc-shaped protrusion closer to the subframe, allowing the motor end cover to be directly fixed to the subframe, reducing the need for adapter brackets and simplifying the assembly process. The arc-shaped protrusion also increases the structural strength of the motor end cover, resulting in a more stable fixation between the motor end cover and the subframe.

[0073] The powertrain provided in this application embodiment is used in electric vehicles to improve the overall performance of electric vehicles.

[0074] Figure 1 This is a schematic diagram of an electric vehicle 1 provided in an embodiment of this application.

[0075] In one embodiment, the electric vehicle 1 includes a powertrain 10, a frame 20, a power battery 30, and wheels 40, such as Figure 1 As shown, the frame 20 is used to fix the powertrain 10, the wheels 40 and the power battery 30. The powertrain 10 is connected to the wheels 40 in a transmission manner, and the power battery 30 provides electrical energy to the powertrain 10.

[0076] In this embodiment of the application, the electric vehicle 1 is a car, and the powertrain 10 is capable of driving the wheels 40 to rotate.

[0077] Figure 2 This is a schematic diagram of the powertrain 10 and subframe 50 provided in an embodiment of this application.

[0078] like Figure 2 As shown, in one embodiment, the electric vehicle 1 further includes a subframe 50 for securing the powertrain 10 to the frame 20. The subframe 50 surrounds the powertrain 10.

[0079] Figure 3 This is a schematic diagram of a powertrain 10 provided in an embodiment of this application.

[0080] In one embodiment, the powertrain 10 includes a drive motor 11, a reducer 12, and a motor controller 13.

[0081] In the embodiments of this application, such as Figure 2 and Figure 3 As shown, the power battery 30 is used to supply high-voltage direct current to the motor controller 13. The motor controller 13 converts the high-voltage direct current into alternating current and transmits it to the drive motor 11. The motor shaft 120 of the drive motor 11 (as shown) Figure 4 (As shown) The transmission is connected to the input shaft of the reducer 12, and the output shaft of the reducer 12 is connected to the wheel 40 to drive the wheel 40 to move.

[0082] Currently, powertrains mainly use adapter brackets to fix the drive motor of the powertrain and the subframe of the electric vehicle. This requires reserving assembly space for the adapter brackets, which makes the installation and fixing of the powertrain difficult. Furthermore, the use of adapter brackets can lead to breakage and reduced reliability.

[0083] In this application, by forming an arc-shaped protrusion on the motor end cover and forming a suspension hole on the arc-shaped protrusion for direct fixed connection with the subframe, a direct fixed connection without adapter brackets is achieved. This not only enhances the stability of the powertrain mounted on the subframe, but also makes installation more convenient. It also reduces the axial space required when fixing the powertrain to the subframe, which is beneficial for optimizing the layout of the powertrain in the vehicle. Furthermore, it avoids vibration and noise generated between the adapter bracket and the drive motor during the operation of the electric vehicle, which is beneficial for improving the NVH performance of the electric vehicle.

[0084] The powertrain 10 provided in the embodiments of this application will be described in detail below.

[0085] Figure 4 This is another schematic diagram of the powertrain 10 provided in the embodiments of this application. Figure 5 This is an exploded view of the overall casing 10a provided in an embodiment of this application. Figure 6 This is a schematic diagram of a motor end cover 200 provided in an embodiment of this application. Figure 7 This is another schematic diagram of the motor end cover 200 provided in the embodiments of this application.

[0086] In one embodiment, such as Figure 4 As shown, the powertrain 10 includes a drive motor 11a and a reducer 12a, as... Figures 5 to 7As shown, the main housing 10a of the powertrain 10 includes a motor housing 100 and a motor end cover 200. The motor end cover 200 includes two sides 200a and 200b, which face each other along the axial direction O of the powertrain 10. One side 200a encloses the motor housing 100 to form a motor cavity 110, which houses the stator and rotor of the drive motor 11a. The motor shaft 120 of the drive motor 11a is used for transmission connection to the input shaft of the reducer 12a. The other side 200b includes an arc-shaped protrusion 210, such as... Figure 2 and Figure 5 As shown, the arc-shaped protrusion 210 protrudes away from the side 200a along the axial direction O of the powertrain 10. The arc-shaped protrusion 210 includes a suspension hole 211. The opening of the suspension hole 211 faces away from the side 200a along the axial direction O of the powertrain 10. The suspension hole 211 is used to directly fix a subframe 50 of the electric vehicle 1.

[0087] In this embodiment, the side 200b of the motor end cover 200 includes an arc-shaped protrusion 210. The arc-shaped protrusion 210 protrudes away from the side 200a along the axial direction O of the powertrain 10, so that the arc-shaped protrusion 210 is closer to the subframe 50. The arc-shaped protrusion 210 includes a suspension hole 211, so that the distance between the suspension hole 211 formed in the arc-shaped protrusion 210 and the subframe 50 is closer, thereby allowing the suspension hole 211 to be directly fixed to the subframe 50.

[0088] In this embodiment, the arc-shaped protrusion 210 refers to its extension along the circumferential direction C of the powertrain 10. The distribution of the arc-shaped protrusion 210 along the circumferential direction C of the powertrain 10 results in high structural strength of the motor end cover 200. In one embodiment, the length of the arc-shaped protrusion 210 along the circumferential direction C of the powertrain 10 is greater than or equal to one-quarter of the circumference of the motor end cover 200. In another embodiment, the angle between the two ends of the arc-shaped protrusion 210 along the circumferential direction C of the powertrain 10 and the central angle of the axis of the drive motor 11a is greater than or equal to 90°.

[0089] In this embodiment, the opening of the suspension hole 211 faces away from the side 200a along the axial direction O of the powertrain 10, so that the opening of the suspension hole 211 faces the subframe 50 along the axial direction O of the powertrain. This allows the subframe 50 to be directly fixed to the suspension hole 211 from the outside of the subframe 50 along the axial direction O of the powertrain using bolts, simplifying the assembly process. Compared to indirectly fixing the subframe 50 to the subframe 50 using an adapter bracket, directly fixing the suspension hole 211 of the arc-shaped protrusion 210 of the motor end cover 200 to the subframe 50 reduces the need for adapter brackets, not only enhancing the stability of the powertrain 10 mounted on the subframe 50 but also making installation more convenient.

[0090] In this embodiment, the motor end cover 200 directly fixes the subframe 50, which can also reduce the axial space that needs to be reserved when fixing the powertrain 10 to the subframe 50. This makes the overall axial dimension of the powertrain 10 after it is fixed to the subframe 50 smaller, which is beneficial to optimizing the layout of the powertrain 10 in the vehicle.

[0091] In this embodiment, the motor end cover 200 is directly fixed to the subframe 50, and the length of the arc-shaped protrusion 210 along the axial direction O of the powertrain 10 is smaller than that of the adapter bracket. Alternatively, the powertrain 10 is fixed to a subframe 50 of the same size. In the scheme of directly fixing the powertrain 10 to the subframe 50 via the arc-shaped protrusion 210 of the motor end cover 200, the arc-shaped protrusion 210 has a smaller axial length than the adapter bracket, which allows the axial length of the powertrain 10 fixed to the subframe 50 of the same size to be larger. This can increase the volume of the drive motor 11 or the reducer 12 in the powertrain 10, thereby improving the power performance of the powertrain 10.

[0092] In this embodiment of the application, the arc-shaped protrusion 210 is integrally formed on the motor end cover 200, which makes the overall structure of the motor end cover 200 stronger and the vibration smaller. The use of the adapter bracket is eliminated, and the vibration noise generated between the adapter bracket and the drive motor 11 during the operation of the electric vehicle 1 can also be avoided, which is beneficial to improving the NVH performance of the electric vehicle.

[0093] In this embodiment, an arc-shaped protrusion 210 is formed on the side 200b of the motor end cover 200 facing away from the stator of the drive motor 11. This arc-shaped protrusion 210 protrudes towards the subframe 50 along the powertrain axis O, bringing the mounting hole 211 formed on the arc-shaped protrusion 210 closer to the subframe 50. This allows the motor end cover 200 to be directly fixed to the subframe 50, reducing the use of adapter brackets, simplifying the assembly process, and reducing the overall axial dimensions of the powertrain 10 and the subframe 50. The arc-shaped protrusion 210 also increases the structural strength of the motor end cover 200, resulting in a more stable fixation between the motor end cover 200 and the subframe 50, which is beneficial for improving the NVH performance of the electric vehicle 1.

[0094] in, Figure 4 The motor shaft 120 of the drive motor 11a is a schematic position of the motor shaft 120 and does not represent the specific structure.

[0095] In one embodiment, the arcuate protrusion 210 includes two ends 212, 213 arranged opposite each other along the circumferential C of the powertrain 10, such as... Figure 5 and Figure 6As shown, the length of the arc-shaped protrusion 210 along the axial direction O of the powertrain 10 increases first and then decreases from one end 212 of the two ends 212 and 213 to the other end 213. The length of the arc-shaped protrusion 214 where the suspension hole 211 is located along the axial direction O of the powertrain 10 is greater than the length of either end 212 or 213 along the axial direction O of the powertrain 10.

[0096] In this embodiment, the arc-shaped protrusion 210 includes two ends 212 and 213 arranged opposite each other along the circumferential direction C of the powertrain 10. The arc-shaped protrusion 210 is arranged along the circumferential direction C of the powertrain so that the arc-shaped protrusion 210 can make full use of the space on the side 200b of the motor end cover 200, which facilitates the formation of a larger arc-shaped protrusion 210, making the direct fixed connection between the motor end cover 200 and the subframe 50 more stable.

[0097] In this embodiment, the suspension hole 211 is formed between the two ends 212 and 213 of the arc-shaped protrusion 210 arranged opposite each other along the circumferential C of the powertrain. The length of the arc-shaped protrusion 210 along the axial direction O of the powertrain 10 first increases and then decreases from one end 212 to the other end 213. This allows for a larger axial thickness of the arc-shaped protrusion 210 at the location where the suspension hole 211 is formed, ensuring that the suspension hole 211 of the motor end cover 200 can be directly fixed to the subframe 50. The smaller axial thickness of the two ends 212 and 213 of the arc-shaped protrusion 210 is beneficial for weight reduction of the motor end cover 200. It also allows the force on the arc-shaped protrusion 210 to be better distributed to the motor end cover 200 along the circumferential C of the powertrain, enhancing the structural strength of the motor end cover 200. The length of the arc-shaped protrusion 210 along the axial direction O of the powertrain 10 increases first and then decreases from one end 212 to the other end 213 at both ends 212 and 213, which can also reduce the difficulty of die casting the arc-shaped protrusion 210.

[0098] In this embodiment, the length of the arc-shaped protrusion 214 where the suspension hole 211 is located along the axial direction O of the powertrain 10 is greater than the length of either end 212 or 213 along the axial direction O of the powertrain 10. This allows the suspension hole 211 to be formed on the arc-shaped protrusion 214 with a larger axial length, so that the suspension hole 211 of the motor end cover 200 can be closer to the subframe 50 and directly fixed to the subframe 50.

[0099] In one embodiment, the arcuate protrusion 210 includes two sides 215, 216 arranged opposite each other along the radial direction R of the powertrain 10, such as... Figure 6 As shown, the arc-shaped protrusion 210 increases in length along the axial direction O of the powertrain 10 from one side 215 to the other side 216 of the two sides 215 and 216, and the suspension holes 211 are arranged between the two sides 215 and 216 along the radial direction R of the powertrain 10.

[0100] In the embodiments of this application, such as Figure 5 and Figure 6 As shown, the length of the arc-shaped protrusion 210 along the axial direction O of the powertrain 10 increases first and then decreases from one side 215 of the two sides 215 and 216 to the other side 216, making the surface 217 of the arc-shaped protrusion 210 facing away from the side 200a form an arc surface. The curvature of the arc surface faces the motor housing 100. The arc surface makes the force on the arc-shaped protrusion 210 more evenly distributed, thereby making the structural strength of the arc-shaped protrusion 210 and the motor end cover 200 stronger. The fact that the length of the arc-shaped protrusion 210 along the axial direction O of the powertrain 10 increases first and then decreases from one side 215 of the two sides 215 and 216 to the other side 216 can also reduce the difficulty of die-casting the arc-shaped protrusion 210.

[0101] In this embodiment, the radial R suspension holes 211 of the powertrain 10 are arranged between the two sides 215 and 216, so that the suspension holes 211 can be formed at the position with a large axial length of the arc protrusion 210, so that the suspension holes 211 of the motor end cover 200 can be directly fixed to the subframe 50.

[0102] In one embodiment, such as Figure 6 and Figure 7 As shown, side surface 200a includes a bearing groove 221 for fixing the outer ring of a bearing. The inner ring of the bearing is fixed to the motor shaft 120 of the drive motor 11a. The motor end cover 200 includes a through hole 230, which extends through the bottom of the bearing groove 221 and the side surface 200b along the axial direction O of the powertrain 10. The arc-shaped protrusion 214 containing the suspension hole 211 has a length along the radial direction R of the powertrain 10 greater than the distance between the arc-shaped protrusion 214 and the through hole 230.

[0103] In this embodiment, the length of the arc-shaped protrusion 214 where the suspension hole 211 is located along the radial direction R of the powertrain 10 is denoted as L1, and the distance between the arc-shaped protrusion 214 and the through hole 230 is denoted as L2. Since L1 > L2, the larger L1 makes the arc-shaped protrusion 210 along the radial direction R of the powertrain larger in the motor end cover 200, thereby ensuring that the motor end cover 200 has strong structural strength. It also allows the arc-shaped protrusion 210 to have space to form the suspension hole 211, so that the motor end cover 200 is more firmly fixed to the subframe 50.

[0104] in, Figure 7 The motor shaft 120 in the diagram represents only the schematic position of the motor shaft 120 and does not represent the specific structure.

[0105] In one embodiment, the side surface 200b further includes a suspension boss 223, such as Figure 6As shown, the mounting boss 223 is fixed to the surface 217 of the arc-shaped protrusion 210, and the mounting boss 223 protrudes from the surface 217 of the arc-shaped protrusion 210 away from the side 200a. The mounting boss 223 includes a mounting surface 244, which is planar. The mounting hole 211 penetrates the mounting surface 244 along the axial direction O of the powertrain 10. The mounting surface 244 is used to contact the subframe 50 when the subframe 50 is fixed in the mounting hole 211.

[0106] In this embodiment, the arc-shaped protrusion 210 extends along the circumferential direction C of the powertrain 10, giving it a relatively long length along the circumferential direction C. However, this also results in a smaller contact area between the arc-shaped protrusion 210 and the subframe 50. The mounting protrusion 223 is fixed to the surface 217 of the arc-shaped protrusion 210. The mounting protrusion 223 protrudes from the surface 217 of the arc-shaped protrusion 210 away from the side 200a. The mounting surface 244 of the mounting protrusion 223 is flat, which increases the contact area between the arc-shaped protrusion 210 and the subframe 50 when the arc-shaped protrusion 210 is installed and fixed to the subframe 50, making the mounting hole 211 of the arc-shaped protrusion 210 more securely installed and fixed to the subframe 50. The mounting boss 223 can enhance the structural strength of the motor end cover 200, thereby ensuring both the structural strength of the motor end cover 200 and the stability of the installation between the motor end cover 200 and the subframe 50, thus comprehensively improving the overall strength of the powertrain 10 and the subframe 50.

[0107] In this embodiment, by forming a suspension boss 223 on the arc-shaped protrusion 210, and the suspension hole 211 passing through the mounting surface 244 of the suspension boss 223 along the axial direction O of the powertrain 10, compared with direct fixation through the suspension hole 211, the support force of fixation can be increased, the deformation of the arc-shaped protrusion 210 can be reduced, and the modality of the arc-shaped protrusion 210 can be improved.

[0108] Figure 8 This is a cross-sectional view of the motor end cover 200 provided in an embodiment of this application.

[0109] In one embodiment, side surface 200a includes a recess 222, such as Figure 7 and Figure 8 As shown, the groove 222 is recessed towards the arc-shaped protrusion 210 along the axial direction O of the powertrain 10. The distance between the bottom 222a of the groove 222 and the surface 217 of the arc-shaped protrusion 210 along the axial direction O of the powertrain 10 is less than the length of the arc-shaped protrusion 210.

[0110] In this embodiment, the side surface 200a includes a groove 222, which is recessed toward the arc-shaped protrusion 210 along the axial direction O of the powertrain 10. This allows for weight reduction of the motor end cover 200 while ensuring that the arc-shaped protrusion 210 has a large axial length for arranging the suspension hole 211. It also saves materials and reduces production costs.

[0111] In this embodiment, the distance between the bottom 222a of the groove 222 along the axial direction of the powertrain 10 and the surface 217 of the arc-shaped protrusion 210 is less than the length of the arc-shaped protrusion 210, so that the weight of the motor end cover 200 can be reduced while the arc-shaped protrusion 210 can be directly and stably fixed to the subframe 50.

[0112] It should be noted that the comparison of the distance between the bottom 222a of the groove 222 of the powertrain 10 and the surface 217 of the arc-shaped protrusion 210 and the length of the arc-shaped protrusion 210 is based on the comparison of the bottom 222a of the groove 222 and the surface 217 of the arc-shaped protrusion 210 at the same position along the radial R and circumferential C of the powertrain.

[0113] In one embodiment, multiple reinforcing ribs (not shown) are arranged on the inner side of the groove 222 to enhance the structural strength of the motor end cover 200.

[0114] In one embodiment, the powertrain 10's main housing 10a further includes a reduction gear housing 300, such as Figure 4 and Figure 5 As shown, the reducer housing 300 and the motor housing 100 are arranged adjacent to each other along the axial direction O of the powertrain 10. The reducer housing 300 is used to accommodate the gear shaft assembly of the reducer 12a. The reducer housing 300 includes an output shaft hole 310 for accommodating a half shaft 311, which is used to drive the wheel 40. The outer peripheral wall 320 of the reducer housing 300 includes another suspension hole 321 for fixing the subframe 50. The motor housing 100, the output shaft hole 310, and the suspension hole 321 are arranged sequentially at intervals along the radial direction R of the powertrain 10. The opening of the suspension hole 321 is away from the motor housing 100 along the radial direction R of the powertrain 10.

[0115] In this embodiment, the reducer housing 300 and the motor housing 100 are arranged adjacent to each other along the axial direction O of the powertrain 10. The reducer housing 300 includes an output shaft hole 310 for accommodating a half-shaft 311. The half-shaft 311 is used to drive the wheel 40, so that after the input shaft of the reducer 12a receives the power transmitted from the motor shaft 120 of the drive motor 11a, it can transmit the power to the wheel 40 through the half-shaft 311 in the output shaft hole 310 of the reducer housing 300, thereby driving the electric vehicle 1. In one embodiment, the motor housing 100 and the reducer housing 300 are integrally die-cast, making the overall housing 10a of the powertrain 10 structurally stronger.

[0116] In this embodiment, the outer peripheral wall 320 of the reducer housing 300 includes a suspension hole 321 for fixing the subframe 50. The motor housing 100, the output shaft hole 310 and the suspension hole 321 are arranged sequentially and at intervals along the radial direction of the powertrain 10, so that the suspension hole 321 is formed on the side 215 of the output shaft hole 310 of the reducer housing 300 away from the motor housing 100 for directly fixing the subframe 50. This allows the drive motor 11 and the reducer 12 of the powertrain 10 to be directly fixed to the subframe 50, making the fixation between the powertrain 10 and the subframe 50 more stable.

[0117] In this embodiment, the opening of the suspension hole 321 along the radial R of the powertrain 10 is away from the motor housing 100, so that the suspension hole 321 and the subframe 50 can be directly fixed by bolts passing through the powertrain along the radial R of the subframe 50 from the outside of the subframe 50, making the installation more convenient.

[0118] in, Figure 5 The middle half-shaft 311 is only a schematic position of the half-shaft 311 and does not represent the specific structure.

[0119] In one embodiment, such as Figure 4 As shown, the distance between the suspension hole 321 and the suspension hole 211 along the radial direction R of the powertrain 10 is greater than the distance between the suspension hole 321 and the axis of the motor shaft 120.

[0120] In this embodiment, the distance between the radial suspension hole 321 and the suspension hole 211 along the powertrain 10 is greater than the distance between the suspension hole 321 and the axis of the motor shaft 120. This makes the suspension hole 321 of the reducer housing 300 and the suspension hole 211 of the motor end cover 200 arranged on both sides of the axis of the motor shaft 120. This makes the fixing position between the powertrain 10 and the subframe 50 more uniform, and makes the support force of the subframe 50 on the powertrain 10 more balanced. This is beneficial to make the fixing of the powertrain 10 and the subframe 50 more balanced and stable.

[0121] Figure 9 This is a schematic diagram of the overall housing 10a provided in an embodiment of this application.

[0122] In one embodiment, the main housing 10a of the powertrain 10 further includes a connecting plate 400, such as Figure 5 and Figure 9 As shown, the connecting plate 400 encloses a portion of the outer wall 130 of the motor housing 100 and a portion of the outer wall 330 of the reducer housing 300 to form an electrical control groove 500, which is used to accommodate the functional components of a motor controller 13. Figure 9 As shown, the suspension holes 321 are arranged on one side of the outer wall 330 of the connecting plate 400 away from the reducer housing 300.

[0123] In this embodiment, the connecting plate 400 encloses a portion of the outer wall 130 of the motor housing 100 and a portion of the outer wall 330 of the reducer housing 300 to form an electrical control groove 500. By reusing the portion of the outer wall 130 of the motor housing 100 and the portion of the outer wall 330 of the reducer housing 300 to form the groove wall of the electrical control groove 500, the electrical control groove 500 does not excessively occupy the space of the total housing 10a, which helps to reduce the volume of the total housing 10a and facilitates the layout of the powertrain 10 within the vehicle. It also makes full use of the space between the motor housing 100 and the reducer housing 300, making the layout of the total housing 10a of the powertrain 10 more compact.

[0124] In this embodiment, the suspension holes 321 are arranged on the side of the connecting plate 400 away from the outer wall 330 of the reducer housing 300, so that along the height direction of the powertrain 10, the suspension holes 321 of the reducer housing 300 are arranged below the electronic control slot 500, thereby utilizing the space below the electronic control slot 500 to fix it to the subframe 50, making the arrangement of the powertrain 10 and the subframe 50 more compact, which is beneficial to optimizing the layout of the powertrain 10 and the subframe 50 in the whole vehicle.

[0125] In one embodiment, the motor housing 100, the reducer housing 300, and the connecting plate 400 are integrally formed, which makes the overall strength of the powertrain 10 housing 10a stronger.

[0126] In one embodiment, such as Figure 5 and Figure 9 As shown, the connecting plate 400 includes a base plate 410, which includes two sub-plates 411 and 412. One sub-plate 411 is arranged adjacent to the reducer housing 300 along the axial direction O of the powertrain 10, and the other sub-plate 412 is arranged adjacent to the reducer housing 300 along the radial direction R of the powertrain 10. The two sub-plates 411 and 412 are used to form part of the bottom 510 of the electrical control slot 500. The outer peripheral wall 320 of the reducer housing 300 also includes another suspension boss 322. The suspension boss 322 protrudes away from an output shaft hole 310 along the radial direction R of the powertrain. The suspension boss 322 is arranged on the side of the sub-plate 412 away from the outer wall 330 of the reducer housing 300 along the circumferential direction C of the powertrain 10. The suspension hole 321 is formed in the suspension boss 322.

[0127] In this embodiment, the sub-plate 412 and the reducer housing 300 are arranged adjacent to each other along the radial direction R of the powertrain 10. The sub-plate 412 is used to form the bottom 510 of the electrical control groove 500, expanding the radial space of the electrical control groove 500 and providing more space to accommodate the functional components of the motor controller 13. Suspension bosses 322 are arranged along the circumferential direction C of the powertrain 10 on the side of the sub-plate 412 facing away from the outer wall 330 of the reducer housing 300, thereby allowing the arrangement of the suspension bosses 322 to fully utilize the space below the sub-plate 412 along the circumferential direction C of the powertrain 10.

[0128] In this embodiment, the mounting hole 321 is formed on the mounting boss 322, which can enhance the fixing stability of the mounting hole 321 and the subframe 50. In addition, the mounting boss 322 protrudes away from an output shaft hole 310 along the powertrain radial direction R, so that the mounting hole 321 formed in the mounting boss 322 can be closer to the subframe 50, which facilitates the fitting and installation of the mounting hole 321 and the subframe 50.

[0129] In one embodiment, such as Figure 5 As shown, along the radial direction R of the powertrain 10, the length of the protrusion of the mounting boss 322 is less than the length of the sub-plate 412. This ensures that the mounting boss 322 does not occupy additional space in the electrical control slot 500 beyond the radial direction R of the powertrain 10, which helps to make the powertrain 10 have a smaller volume.

[0130] In one embodiment, along the circumferential direction C of the powertrain 10, multiple reinforcing ribs are arranged around the suspension boss 322 to enhance the structural strength of the suspension boss 322 and improve the stability of the suspension boss 322 fixed to the subframe 50.

[0131] Figure 10 This is another schematic diagram of the overall housing 10a provided in the embodiments of this application.

[0132] In one embodiment, such as Figure 4 As shown, the powertrain 10 also includes another drive motor 11b and another reducer 12b, with reducers 12a and 12b arranged between drive motors 11a and 11b, as shown. Figure 10As shown, the main housing 10a of the powertrain 10 also includes another motor housing 600 and another motor end cover 700. One side 700a of the motor end cover 700 encloses the motor housing 600 to form another motor cavity 610, which is used to accommodate the stator and rotor of the drive motor 11b. The other side 700b of the motor end cover 700 includes another arcuate protrusion 710. The arcuate protrusion 710 of the side 700b of the motor end cover 700 has the same structure as the arcuate protrusion 210 of the motor end cover 200, and the arcuate protrusion 710 of the side 700b of the motor end cover 700 and the arcuate protrusion 210 of the motor end cover 200 are aligned along the axial direction O of the powertrain 10.

[0133] In this embodiment, reducers 12a and 12b are arranged between drive motors 11a and 11b, such that the motor end cover 200 of drive motor 11a and the motor end cover 700 of drive motor 11b can be arranged opposite to each other along the axial direction O of the powertrain 10, and the arc-shaped protrusion 210 of motor end cover 200 and the arc-shaped protrusion 710 of motor end cover 700 can also be arranged opposite to each other along the axial direction O of the powertrain 10, so that the arc-shaped protrusion 210 and the arc-shaped protrusion 710 are more balanced and stable in fixing to the subframe 50.

[0134] In this embodiment, the arc-shaped protrusion 710 on the other side 700b of the motor end cover 700 has the same structure as the arc-shaped protrusion 210 of the motor end cover 200. The arc-shaped protrusion 710 on the side 700b of the motor end cover 700 and the arc-shaped protrusion 210 of the motor end cover 200 are aligned along the axial direction O of the powertrain 10, making the arrangement of the powertrain 10 more regular. It also makes the force for fixing the powertrain 10 and the subframe 50 balanced along the axial direction O of the powertrain, making the direct fixation of the powertrain 10 and the subframe 50 more stable, thereby comprehensively improving the overall structural strength of the powertrain 10 and the subframe 50.

[0135] In one embodiment, the arc-shaped protrusion 710 on the other side 700b of the motor end cover 700 has the same structure as the arc-shaped protrusion 210 of the motor end cover 200. Specifically, the shape, size, and structure of the arc-shaped protrusion 710, as well as the suspension boss of the arc-shaped protrusion 710, are the same as those of the arc-shaped protrusion 210 of the motor end cover 200, and will not be described again here.

[0136] Figure 11 This is a schematic diagram of an intermediate shell 800 provided in an embodiment of this application. Figure 12 This is a cross-sectional view of the powertrain 10 provided in an embodiment of this application.

[0137] In one embodiment, such as Figure 4As shown, the main housing 10a of the powertrain 10 also includes an intermediate housing 800, which is arranged between the motor housing 100 and the motor housing 600 along the axial direction of the powertrain 10. Figure 11 and Figure 12 As shown, the intermediate housing 800 includes two sides 810, each side 810 of the intermediate housing 800 including a reducer receiving groove 811, each reducer receiving groove 811 for receiving a portion of a gear of a reducer 12. The outer wall of the groove periphery of the two reducer receiving grooves 811 includes at least one fixing hole 812 for fixing a wire harness.

[0138] In this embodiment, an intermediate housing 800 is arranged between the motor housing 100 and the motor housing 600 along the axial direction O of the powertrain 10. The intermediate housing 800 includes two side surfaces 810, each side surface 810 of which includes a reducer receiving groove 811. Each reducer receiving groove 811 is used to receive a portion of a gear of the reducer 12, such that the groove peripheral wall of each reducer receiving groove 811 has a large length along the axial direction O of the powertrain 10, thereby allowing the outer wall of the groove peripheral wall of the two reducer receiving grooves 811 to have space to form at least one fixing hole 812.

[0139] In this embodiment, the fixing hole 812 is used to fix the wiring harness, including the wiring harness of the oil pump inside the powertrain 10. The fixing hole 812 can also be used to fix the acoustic package, making the fixing of the powertrain 10 simpler. The acoustic package is used to reduce the noise of the powertrain 10. The fixing hole 812 of the intermediate housing 800 can cooperate with the mounting holes 211 of the motor end cover 200, the mounting holes 211 of the motor end cover 700, the mounting holes 321 of the reducer housing 300, and the mounting hole 321 of another reducer housing 900 to securely fix the powertrain 10 to the subframe 50.

[0140] In one embodiment, such as Figure 11 and Figure 12 As shown, an outer peripheral surface 820 of the intermediate housing 800 includes a receiving groove 821. The recessed direction of the receiving groove 821 faces the gap between the reducer 12a and the reducer 12b. The receiving groove 821 is used to accommodate an electrical component 822, which is used to receive DC power output from the power battery 30 and to supply DC power to the motor controllers 13 of the drive motors 11a and 11b, respectively. At least one fixing hole 812 is arranged on the outer side of the receiving groove 821.

[0141] In this embodiment, the recessed direction of the receiving groove 821 is toward the gap between the reducer 12a and the reducer 12b, so that the space between the gear shaft assembly of the reducer 12a and the reducer 12b is fully utilized. The receiving groove 821 is used to accommodate an electrical component 822, so that some functional components of the motor controller 13 can be placed in the receiving groove 821, thereby reducing the space required by the electrical control groove 500 to accommodate the functional components of the motor controller 13, thereby reducing the volume of the electrical control groove 500, and further reducing the volume of the overall housing 10a of the powertrain 10, thus optimizing the layout of the powertrain 10 in the vehicle.

[0142] In this embodiment of the application, at least one fixing hole 812 is arranged on the outside of the receiving groove 821, making it easier to fix the fixing hole 812 to the external component.

[0143] in Figure 11 The electrical component 822 is only a schematic location of the electrical component 822 and does not represent the specific structure.

[0144] In one embodiment, such as Figure 11 and Figure 12 As shown, the intermediate housing 800 also includes two side plates 830, which are spaced apart along the circumferential direction C of the powertrain 10. Each side plate 830 is fixedly connected to the outer side wall of one reducer receiving groove 811a and the other reducer receiving groove 811b. The two side plates 830 are used to enclose a portion of the outer side wall of one reducer receiving groove 811a and a portion of the outer side wall of the other reducer receiving groove 811b to form a receiving groove 821. At least one fixing hole 812 is arranged along the circumferential direction C of the powertrain 10 on the side of either side plate 830 opposite to the outer side wall of a portion of the reducer receiving groove 811a.

[0145] In this embodiment, two side plates 830 are used to enclose a portion of the outer side of the groove wall of a reducer receiving groove 811a and a portion of the outer side of the groove wall of another reducer receiving groove 811b to form a receiving groove 821. The formation of the receiving groove 821 reuses a portion of the outer side of the groove wall of the reducer receiving groove 811a and a portion of the outer side of the groove wall of the reducer receiving groove 811b, which makes the integration of the intermediate housing 800 higher and the stability stronger. It also ensures that the receiving groove 821 does not occupy additional space along the radial R of the powertrain of the reducer receiving groove 811a and the reducer receiving groove 811b, thus reducing the volume of the overall housing 10a of the powertrain 10.

[0146] In this embodiment of the application, at least one fixing hole 812 is arranged along the circumferential direction C of the powertrain 10 on the side of any side plate 830 away from the outer side of a portion of the groove wall of a reducer receiving groove 811, such that the fixing hole 812 is located outside the receiving groove 821, which facilitates the fixing hole 812 to be fixedly connected to external components.

[0147] In one embodiment, the outer wall of the groove peripheral wall of the two reducer receiving grooves 811 includes a plurality of fixing holes 812, which are arranged at intervals along the circumferential direction C of the powertrain 10.

[0148] The powertrain and electric vehicle provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and embodiments of this application. The description of the embodiments above is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in specific embodiments and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A powertrain, characterized in that, The powertrain includes a drive motor and a reducer. The powertrain housing includes a motor housing and a motor end cover. The motor end cover has two sides facing each other along the axial direction of the powertrain. One side encloses the motor housing to form a motor cavity. The motor cavity accommodates the stator and rotor of the drive motor. The motor shaft of the drive motor is used for a drive connection to the input shaft of the reducer. Another side includes an arcuate protrusion that is axially opposite to the first side protrusion of the powertrain. The arcuate protrusion includes a mounting hole with its opening facing axially opposite to the first side of the powertrain. The mounting hole is used to directly secure a subframe of the electric vehicle.

2. The powertrain according to claim 1, characterized in that, The arc-shaped protrusion includes two ends arranged opposite each other along the circumference of the powertrain. The length of the arc-shaped protrusion along the axial direction of the powertrain increases and then decreases from one end to the other. The length of the arc-shaped protrusion portion where the suspension hole is located along the axial direction of the powertrain is greater than the length of either end along the axial direction of the powertrain.

3. The powertrain according to claim 1, characterized in that, The arc-shaped protrusion includes two sides arranged opposite each other along the radial direction of the powertrain. The length of the arc-shaped protrusion along the axial direction of the powertrain increases and then decreases from one side to the other. The suspension hole is arranged between the two sides along the radial direction of the powertrain.

4. The powertrain according to claim 1, characterized in that, One side includes a bearing groove for fixing the outer ring of a bearing, the inner ring of the bearing being fixed to the motor shaft of the drive motor, and the motor end cover including a through hole extending through the bottom of the bearing groove and the other side along the axial direction of the powertrain, wherein: The length of the arc-shaped protrusion containing the suspension hole along the radial direction of the powertrain is greater than the distance between the arc-shaped protrusion and the through hole.

5. The powertrain according to claim 1, characterized in that, The other side also includes a suspension boss, which is fixed to the surface of the arc-shaped protrusion. The suspension boss protrudes from the surface of the arc-shaped protrusion away from the side protrusion, wherein: The mounting boss includes a mounting surface, which is a plane. The mounting hole extends through the mounting surface along the axial direction of the powertrain. The mounting surface is used to contact the subframe when the subframe is fixed in the mounting hole.

6. The powertrain according to claim 1, characterized in that, One side includes a groove that is recessed toward the arcuate protrusion along the axial direction of the powertrain, wherein: The distance between the bottom of the groove and the surface of the arcuate protrusion along the axial direction of the powertrain is less than the length of the arcuate protrusion.

7. The powertrain according to any one of claims 1-6, characterized in that, The powertrain housing also includes a reducer housing, which is arranged adjacent to the motor housing along the axial direction of the powertrain. The reducer housing accommodates the gear shaft assembly of the reducer and includes an output shaft bore for accommodating a half-shaft, which is used to drive a wheel. The outer peripheral wall of one reducer housing includes another mounting hole for fixing the one subframe. The motor housing, the output shaft hole and the other mounting hole are arranged in sequence at intervals along the radial direction of the powertrain. The opening of the other mounting hole is away from the motor housing along the radial direction of the powertrain.

8. The powertrain according to claim 7, characterized in that, The distance between the other mounting hole and the first mounting hole along the radial direction of the powertrain is greater than the distance between the other mounting hole and the axis of the motor shaft.

9. The powertrain according to claim 7, characterized in that, The powertrain housing also includes a connecting plate, which encloses a portion of the outer wall of a motor housing and a portion of the outer wall of a reducer housing to form an electrical control slot. This electrical control slot accommodates functional components of a motor controller, wherein: The other suspension hole is located on the side of the connecting plate opposite to the outer wall of the portion of the reducer housing.

10. The powertrain according to claim 9, characterized in that, The connecting plate includes a base plate, and the base plate includes two sub-plates. One sub-plate is arranged adjacent to the reducer housing along the axial direction of the powertrain, and the other sub-plate is arranged adjacent to the reducer housing along the radial direction of the powertrain. The two sub-plates form part of the bottom of the electrical control slot, wherein: The outer peripheral wall of the reducer housing also includes another mounting boss, which protrudes away from the output shaft hole along the powertrain radial direction. The other mounting boss is arranged on the side of the other sub-plate away from the portion of the outer wall of the reducer housing along the circumferential direction of the powertrain. The other mounting hole is formed in the other mounting boss.

11. The powertrain according to any one of claims 1-6, characterized in that, The powertrain also includes another drive motor and another reducer, which are arranged between the first drive motor and the second drive motor. The overall housing of the powertrain also includes another motor housing and another motor end cover. One side of the other motor end cover encloses the other motor housing to form another motor cavity, which is used to accommodate the stator and rotor of the other drive motor. The other side of the other motor end cover includes another arcuate protrusion, wherein: The other arcuate protrusion on the other side of the other motor end cover has the same structure as the arcuate protrusion on the first motor end cover, and the other arcuate protrusion on the other side of the other motor end cover is aligned with the arcuate protrusion on the first motor end cover along the axial direction of the powertrain.

12. The powertrain according to claim 11, characterized in that, The powertrain housing also includes an intermediate housing arranged axially between the motor housing and the other motor housing. The intermediate housing includes two sides, each side including a reducer receiving slot for receiving a portion of a gear from one of the reducers. The outer wall of the peripheral wall of the two reducer receiving slots includes at least one fixing hole for fixing the wire harness.

13. The powertrain according to claim 12, characterized in that, An outer peripheral surface of one of the intermediate housings includes a receiving groove, the recess of which faces the gap between the one reducer and the other reducer. The receiving groove is used to accommodate an electrical component for receiving direct current (DC) power from the power battery and for supplying DC power to the motor controllers of the one drive motor and the other drive motor, respectively. The at least one fixing hole is arranged on the outside of the receiving groove.

14. The powertrain according to claim 13, characterized in that, The intermediate housing also includes two side plates, which are spaced apart circumferentially along the powertrain. Each side plate is fixedly connected to the outer side wall of one reducer receiving slot and the other reducer receiving slot. The two side plates enclose a portion of the outer side wall of one reducer receiving slot and a portion of the outer side wall of the other reducer receiving slot to form a receiving slot, wherein: At least one fixing hole is arranged circumferentially along the powertrain on the side of any of the side plates opposite to the outer side of the partial groove wall of the reducer receiving groove.

15. An electric vehicle, characterized in that, The electric vehicle includes a frame, a power battery, and a powertrain as described in any one of claims 1-14, wherein the frame is used to fix the power battery and the powertrain, the power battery is used to drive the drive motor of the powertrain, and the drive motor is used to drive the wheels through a reducer.

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