Wheel drive assembly and vehicle

Abstract

The application relates to the technical field of wheel drive, and discloses a wheel drive assembly and a vehicle. The wheel drive assembly comprises a motor unit, a first transmission and a second transmission which are integrated together, the central axes of the motor components of the first driving motor component and the second driving motor component in the motor unit are used to extend along the width direction of the vehicle so as to form a first driving motor and a second driving motor which share one motor shell; the first output shaft of the first driving motor is in power transmission connection with the first input shaft of the first transmission, and the second output shaft of the second driving motor is in power transmission connection with the second input shaft of the second transmission; the first output axle half of the first transmission and the second output axle half of the second transmission are arranged along the axle half central axis A, and the axle half central axis A is located in the cross section of the rotor of the first driving motor. The wheel drive assembly is integrated together, the structure is compact, the volume weight is small, and the cost is low.

Description

[0001] This application is a divisional application of Chinese patent application filed on November 30, 2020, with application number 202011378556.6 and invention title "Wheel-side drive assembly and vehicle". Technical Field

[0002] This invention relates to the field of wheel-side drive technology, and more specifically to a wheel-side drive assembly and a vehicle. Background Technology

[0003] With the development of vehicle technology, electric vehicles are becoming increasingly popular. For example, the four-wheel independent drive system of electric vehicles uses four motors to drive the four wheels of the vehicle independently. The torque and speed of the four wheels can be controlled independently and precisely, which brings a series of advantages, such as enabling smaller turning radius, ESP assistance function, assisted steering function, assisted braking function, and so on.

[0004] Typically, wheel-side drive systems often employ a four-wheel independent drive system. In existing wheel-side drive systems, the left and right drive assemblies are often separate units, which occupy a large space and are costly. Summary of the Invention

[0005] The purpose of this invention is to provide a wheel-side drive assembly that is integrated into one unit, has a compact structure, high space utilization, small size and weight, and low cost.

[0006] To achieve the above objectives, the present invention provides a wheel-side drive assembly, which includes an integrated motor unit, a first transmission, and a second transmission, wherein the first transmission and the second transmission are respectively disposed on both sides of the motor unit in the vehicle width direction; the motor unit further includes a motor housing, a first drive motor assembly, and a second drive motor assembly, wherein the first drive motor assembly and the second drive motor assembly are disposed within the motor housing and spaced apart in the vehicle length direction, and the central axis of each of the first drive motor assembly and the second drive motor assembly extends along the vehicle width direction to form a first drive motor and a second drive motor sharing the same motor housing; the first output shaft of the first drive motor is connected to the first input shaft of the first transmission for power transmission, and the second output shaft of the second drive motor is connected to the second input shaft of the second transmission for power transmission; a portion of one sidewall of the motor housing serves as the inner sidewall of the first transmission, and at least a portion of the other sidewall of the motor housing serves as the inner sidewall of the second transmission; wherein the first output half-shaft of the first transmission and the second output half-shaft of the second transmission are arranged along the same half-shaft central axis A, and the half-shaft central axis A is located within the cross-section of the rotor of the first drive motor.

[0007] In this technical solution, the motor unit, the first transmission, and the second transmission are integrated together. The first transmission and the second transmission are respectively located on both sides of the motor unit in the vehicle width direction. The motor unit includes a first drive motor and a second drive motor integrated together and arranged in the vehicle length direction, with their respective central axes extending along the vehicle width direction. This reduces the height of the motor unit in the vehicle height direction. Furthermore, the first output half-shaft of the first transmission and the second output half-shaft of the second transmission are arranged along the central axis A of the half-shaft, which is located within the cross-section of the rotor of the first drive motor. This makes the power transmission structure within the first transmission compact, reducing the length of the first transmission in the vehicle length direction. Simultaneously, the first and second output half-shafts are arranged close to the first drive motor to meet overall vehicle layout requirements and avoid interference with the subframe or body. Therefore, this wheel-side drive assembly is integrated into a single unit, with a compact structure, high space utilization, small size and weight, and low cost.

[0008] Furthermore, the central axis A of the half-shaft coincides with the central axis B of the first drive motor.

[0009] Furthermore, the first transmission includes a first intermediate shaft that is spaced apart from and parallel to the first input shaft in the vehicle's length direction, and a first input gear disposed on the first input shaft meshes with a first intermediate gear disposed on the first intermediate shaft.

[0010] Furthermore, the distance between the first input shaft and the first drive motor and the second drive motor is reduced, so that the central axis A of the half shaft is located on the side opposite to the second drive motor of the motor central axis B of the first drive motor; a second input gear with a smaller diameter than the first input gear is provided on the first input shaft and replaces the first input gear, and the second input gear meshes with the first intermediate gear.

[0011] Alternatively, the distance between the first drive motor and the second drive motor remains unchanged, and the center axis A of the half-shaft is located on the side opposite to the second drive motor of the motor center axis B of the first drive motor.

[0012] In addition, a support member is provided inside the first transmission. The two ends of the first input shaft are respectively supported on the support member and the inner side wall of the first transmission, and the two ends of the first output half shaft are respectively supported on the support member and the outer side wall of the first transmission.

[0013] In addition, in the first transmission, the power transmission path from the first input shaft to the first output half shaft is a U-shaped transmission path; the U-shaped transmission path makes the length of the first transmission in the vehicle length direction less than the length of the second transmission in the vehicle length direction.

[0014] Additionally, the first transmission includes a first intermediate shaft spaced apart from and parallel to the first input shaft along the vehicle's length direction, with the first input shaft and the first output half-shaft located on the same side of the first intermediate shaft; the second transmission includes a second intermediate shaft spaced apart from the second input shaft along the vehicle's length direction, with the second input shaft and the second output half-shaft located on opposite sides of the second intermediate shaft; wherein, a first angle between the line connecting the axial center of the first input shaft and the axial center of the first intermediate shaft and the line connecting the axial center of the first output half-shaft and the axial center of the first intermediate shaft is less than 90°; and a second angle between the line connecting the axial center of the second input shaft and the axial center of the second intermediate shaft and the line connecting the axial center of the second output half-shaft and the axial center of the second intermediate shaft is greater than 90°.

[0015] In addition, a motor cooling water channel is provided inside the motor housing of the motor unit. The motor cooling water channel includes a cooling water inlet and a cooling water outlet. The motor cooling water channel starts from the cooling water inlet and alternately winds around the first drive motor and the second drive motor to the cooling water outlet.

[0016] Furthermore, the wheel-side drive assembly includes a flat electronic control unit, wherein, in the vehicle height direction, the flat electronic control unit is fixedly connected to the top of the motor unit, the first transmission, and the second transmission.

[0017] Furthermore, the motor unit has a motor cooling water channel inside its motor housing, and the flat electronic control unit has an electronic control cooling water channel inside its electronic control housing, wherein the motor cooling water channel and the electronic control cooling water channel are sealed and connected.

[0018] Furthermore, one of the motor unit and the flat electronic control unit includes a copper busbar, and the other of the flat electronic control unit and the motor unit includes a copper busbar connection end, which is connected to the copper busbar. The electronic control housing of the flat electronic control unit includes an openable maintenance cover located at the copper busbar connection end and the copper busbar connection point.

[0019] Furthermore, the wheel-side drive assembly includes a rotary transformer and a temperature sensor, wherein the rotary transformer and the temperature sensor extend into the motor housing of the motor unit, and the connection lines of the rotary transformer and the temperature sensor to the flat electronic control unit are shielded by the electronic control housing of the flat electronic control unit and the motor housing and are not exposed.

[0020] Finally, the present invention provides a vehicle equipped with any of the wheel-side drive assemblies described above, wherein one of the first output half-shaft and the second output half-shaft serves as the left output half-shaft and the other serves as the right output half-shaft. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a wheel-side drive assembly provided in a specific embodiment of the present invention;

[0022] Figure 2 This is another schematic diagram of the wheel-side drive assembly provided in a specific embodiment of the present invention;

[0023] Figure 3 This is a three-dimensional structural schematic diagram of a wheel-side drive assembly provided in a specific embodiment of the present invention;

[0024] Figure 4 yes Figure 3 A schematic diagram of the disassembled, flattened electronic control unit and motor unit of the wheel-side drive assembly;

[0025] Figure 5 yes Figure 3 Exploded view of the wheel-side drive assembly;

[0026] Figure 6 This is a schematic diagram of the motor cooling water channel of the motor unit in the wheel-side drive assembly provided in a specific embodiment of the present invention;

[0027] Figure 7 This is another schematic diagram of the motor cooling water channel of the motor unit in the wheel-side drive assembly provided in a specific embodiment of the present invention;

[0028] Figure 8 This is a schematic diagram of another three-dimensional structure of the wheel-side drive assembly provided in a specific embodiment of the present invention;

[0029] Figure 9 yes Figure 8 Exploded view of the wheel-side drive assembly;

[0030] Figure 10 yes Figure 9 A schematic diagram of the disassembled, flattened electronic control unit and motor unit of the wheel-side drive assembly.

[0031] Explanation of reference numerals in the attached figures

[0032] 1-First gearbox, 2-Second gearbox, 3-Motor unit, 4-First drive motor, 5-Second drive motor, 6-First output shaft, 7-First input shaft, 8-Second input shaft, 9-First output half shaft, 10-Second output half shaft, 11-First intermediate shaft, 12-First input gear, 13-First intermediate gear, 14-Second input gear, 15-Support member, 16-Second intermediate shaft, 17-Motor housing, 18-First drive motor assembly, 19-Second drive motor assembly, 20-Flat electronic control unit, 21-Motor cooling water channel, 22-Cooling water inlet, 23-Cooling water outlet, 24-Copper busbar, 25-Maintenance cover. Detailed Implementation

[0033] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0034] refer to Figure 1 and Figure 2 The two schematic structures shown indicate that the wheel-side drive assembly provided by the present invention includes an integrated motor unit 3, a first transmission 1, and a second transmission 2. The first transmission 1 and the second transmission 2 are respectively arranged on both sides of the motor unit 3 in the vehicle width direction. The motor unit 3 includes an integrated first drive motor 4 and a second drive motor 5 arranged in the vehicle length direction and transversely along the vehicle width direction. That is, the motor central axis of each of the first drive motor 4 and the second drive motor 5 is used to extend along the vehicle width direction. The first output shaft 6 of the first drive motor 4 is connected to the first input shaft 7 of the first transmission 1 for power transmission, and the second output shaft of the second drive motor 5 is connected to the second input shaft 8 of the second transmission 2 for power transmission. The first output half-shaft 9 of the first transmission 1 and the second output half-shaft 10 of the second transmission 2 are arranged with the half-shaft central axis A, which is located within the cross-section of the rotor of the first drive motor 4.

[0035] Because the motor unit, the first transmission, and the second transmission are integrated together, with the first and second transmissions positioned on either side of the motor unit in the vehicle width direction, and the motor unit comprising a first drive motor and a second drive motor integrated together and arranged transversely along the vehicle width direction in the vehicle length direction, the height of the motor unit in the vehicle height direction can be reduced. Furthermore, the first output half-shaft of the first transmission and the second output half-shaft of the second transmission are arranged along the half-shaft center axis A, which is located within the cross-section of the rotor of the first drive motor. This allows for a compact power transmission structure within the first transmission, reducing the length of the first transmission in the vehicle length direction. Simultaneously, the first and second output half-shafts are positioned close to the first drive motor to meet overall vehicle layout requirements and avoid interference with the subframe or body. Therefore, this wheel-side drive assembly is integrated into a single unit, resulting in a compact structure, high space utilization, small size and weight, and low cost.

[0036] In addition, the housings of the first drive motor 4 and the second drive motor 5 can be integrated, for example, welded together, or, refer to Figures 1-5 As shown, the first drive motor 4 and the second drive motor 5 share the same motor housing. That is, the motor unit 3 includes a motor housing 17, a first drive motor assembly 18, and a second drive motor assembly 19. The first drive motor assembly 18 and the second drive motor assembly 19 are disposed within the motor housing 17 and spaced apart along the vehicle's length direction and transversely positioned along the vehicle's width direction. Specifically, the central axes of each motor assembly of the first drive motor assembly 18 and the second drive motor assembly 19 extend along the vehicle's width direction to form the first drive motor 4 and the second drive motor 5 sharing the same motor housing 17. The first drive motor assembly 18 forms the first drive motor 4, and the second drive motor assembly 19 forms the second drive motor 5, thus forming an integrated first drive motor 4 and second drive motor 5. A portion of one sidewall of the motor housing 17 serves as the inner sidewall of the first transmission 1, and at least a portion of the other sidewall of the motor housing 17 serves as the inner sidewall of the second transmission 2. This allows the motor housing 17 and the transmission to share a sidewall, thereby further improving the integration of the wheel-side drive assembly.

[0037] Furthermore, in this wheel-side drive assembly, the center axis A of the half-shaft can be located anywhere within the cross-section of the rotor of the first drive motor 4. For example, in one embodiment, the center axis A of the half-shaft can be located at the edge of the cross-section of the rotor of the first drive motor 4. Alternatively, in another embodiment, refer to... Figure 1The center axis A of the half-shaft coincides with the center axis B of the first drive motor 4. At this time, the first input shaft 7 and the first drive motor 4 are set to the first position. This allows the power transmission structure within the first gearbox to be more compact, further reducing the length of the first gearbox in the vehicle's length direction.

[0038] Additionally, the first transmission 1 may include a power transmission mechanism, such as multiple gear sets or worm gear sets. For example, in one embodiment, referencing... Figure 1 The first transmission 1 includes a first intermediate shaft 11 that is spaced apart from and parallel to the first input shaft 7 along the length of the vehicle. A first input gear 12 disposed on the first input shaft 7 and a first intermediate gear 13 disposed on the first intermediate shaft 11 mesh. In this way, the rotation output by the first drive motor 4 drives the first intermediate shaft 11 to rotate through the meshing first input gear 12 and first intermediate gear 13. The first intermediate shaft 11 then transmits the rotational power to the subsequent power transmission mechanism.

[0039] Further, refer to Figure 2 In other embodiments, the distance between the first input shaft 7 and the first drive motor 4 and the second drive motor 5 is reduced. That is, the first input shaft 7 and the first drive motor 4 are set in a second position closer to the second drive motor 5 than in the first position. In other words, the distance between the first drive motor 4 and the second drive motor 5 is shortened so that the central axis A of the half-shaft is located on the side of the motor central axis B of the first drive motor 4 facing away from the second drive motor 5. At the same time, in the second position, a second input gear 14 with a diameter smaller than the first input gear 12 is provided on the first input shaft 7 and replaces the first input gear. The second input gear 14 meshes with the first intermediate gear 13. In this way, the diameter of the second input gear 14 can be further reduced, thereby making the structural dimensions of the first transmission 1 more compact.

[0040] Additionally, in alternative embodiments, reference is made to Figure 2 The distance between the first drive motor 4 and the second drive motor 5 remains unchanged, and the center axis A of the half-shaft is located on the side opposite to the second drive motor 5, opposite to the center axis B of the first drive motor 4. In this way, the positions of the first output half-shaft 9 of the first transmission 1 and the second output half-shaft 10 of the second transmission 2 in the vehicle length direction can be adjusted according to the actual layout requirements of the wheel-side drive assembly on the vehicle model, thereby satisfying the layout requirements of different vehicle models and avoiding interference with the subframe or body.

[0041] Additionally, refer to Figure 1 and Figure 2The first transmission 1 is provided with a support member 15. The two ends of the first input shaft 7 are respectively supported on the support member 15 and the inner side wall of the first transmission 1, and the two ends of the first output half shaft 9 are respectively supported on the support member 15 and the outer side wall of the first transmission. In this way, the structure of the first transmission 1 is more compact. The support member 15 can isolate and support the first output half shaft 9 and the first input shaft 7, thereby shortening the length of the first output half shaft 9 and the first input shaft 7 in the vehicle width direction, and reducing the width of the first transmission in the vehicle width direction, so as to make the first transmission more compact.

[0042] Additionally, refer to Figure 1 and 2 In the first transmission, the power transmission path from the first input shaft 7 to the first output half-shaft 9 is a U-shaped transmission path. The U-shaped transmission path makes the length of the first transmission in the vehicle length direction less than the length of the second transmission in the vehicle length direction. In this way, the length of the first transmission in the vehicle length direction can be effectively reduced, making the first transmission more compact. At the same time, the U-shaped transmission path can simplify and compact the power transmission mechanism within the first transmission.

[0043] Additionally, refer to Figure 1 and Figure 2 The first transmission 1 includes a first intermediate shaft 11 spaced apart from and parallel to the first input shaft 7 along the vehicle's length direction. The first input shaft 7 and the first output half-shaft 9 are located on the same side of the first intermediate shaft 11, thus, for example, making the power transmission path from the first input shaft 7 to the first output half-shaft 9 a U-shaped transmission path. Meanwhile, the second transmission 2 includes a second intermediate shaft 16 spaced apart from the second input shaft 8 along the vehicle's length direction. The second input shaft 8 and the second output half-shaft 10 are located on opposite sides of the second intermediate shaft 16. The first included angle between the line connecting the axial center of the first input shaft 7 and the axial center of the first intermediate shaft 11 and the line connecting the axial center of the first output half-shaft 9 and the axial center of the first intermediate shaft 11 is less than 90°, thus further reducing the width of the first transmission in the vehicle's width direction. The second included angle between the line connecting the axial center of the second input shaft 8 and the axial center of the second intermediate shaft 16 and the line connecting the axial center of the second output half-shaft 10 and the axial center of the second intermediate shaft 16 is greater than 90°, and further more than 180°, thus further reducing the width of the second transmission in the vehicle's width direction.

[0044] Additionally, refer to Figure 6 and Figure 7As shown, a motor cooling water channel 21 is provided inside the motor housing of the motor unit 3. The motor cooling water channel 21 includes a cooling water inlet 22 and a cooling water outlet 23. The motor cooling water channel 21 starts from the cooling water inlet and alternately winds around the first drive motor 4 and the second drive motor 5 to the cooling water outlet 23. In this way, after the cooling water enters the motor cooling water channel 21 from the cooling water inlet 22, it will flow alternately through the first drive motor 4 and the second drive motor 5 in sequence, thereby ensuring that the first drive motor 4 and the second drive motor 5 can receive the same degree of cooling and improving the uniformity of heat dissipation.

[0045] In addition, the shared motor housing of the first drive motor 4 and the second drive motor 5 makes it easier to set up such a motor cooling water channel 21.

[0046] Of course, alternatively, the cooling water channels on the housings of the first drive motor 4 and the second drive motor 5 can be connected alternately in sequence, so that the formed motor cooling water channel 21 starts from the cooling water inlet and alternately winds around the first drive motor 4 and the second drive motor 5 to the cooling water outlet 23.

[0047] "The motor cooling water channel 21, starting from the cooling water inlet, alternately winds around the first drive motor 4 and the second drive motor 5, extending to the cooling water outlet 23." This can be done in various ways, for example, in... Figure 6 In this method, the motor cooling water channel 21 wraps around the first drive motor 4 (e.g., the first drive motor assembly 18) once, then winds between the two drive motors onto the second drive motor 5 (e.g., the second drive motor assembly 19) and continues winding, then winds again between the two drive motors onto the first drive motor 4, and so on, alternately. Figure 7 In this method, the motor cooling water channel 21 is wound around the first drive motor 4 to the upper part between the two drive motors, then axially bent and then returned to the first drive motor 4 to the lower part between the two drive motors, then wound around the second drive motor 5 to the upper part between the two drive motors, then axially bent and then returned to the second drive motor 5 to the lower part between the two drive motors, and then wound around the first drive motor 4 again, and so on, alternately.

[0048] Furthermore, the cooling water inlet 22 and cooling water outlet 23 of the motor cooling water channel 21 are formed at the intermediate position between the first drive motor 4 and the second drive motor 5.

[0049] Additionally, refer to Figure 3 , Figure 4 and Figure 5The wheel-side drive assembly includes a flat electronic control unit 20, which is fixedly connected to the top of the motor unit 3, the first transmission 1, and the second transmission 2 in the vehicle height direction. Thus, by using the flat electronic control unit 20, the height of the wheel-side drive assembly in the vehicle height direction can be reduced, and the electronic control unit, motor unit, and transmissions of the wheel-side drive assembly can be more integrated.

[0050] In addition, the motor housing of motor unit 3 is provided with motor cooling water channels, and the electrical control housing of flat electronic control unit 20 is provided with electronic control cooling water channels. The motor cooling water channels and electronic control cooling water channels are sealed and connected. For example, the electronic control cooling water channels can be provided with a main inlet. Cooling water enters the electronic control cooling water channels from the main inlet to cool the flat electronic control unit 20. Because the flat shape of the flat electronic control unit 20 increases the heat dissipation area, and because the heat dissipation of the flat electronic control unit 20 is relatively small, the temperature of the cooling water will not rise significantly. Therefore, it can continue to flow into the motor cooling water channels to alternately cool the two drive motors. The cooling water can be discharged directly from the cooling water outlet 23 of motor unit 3.

[0051] Alternatively, when the flat electronic control unit 20 includes a main water outlet, the cooling water discharged from the cooling water outlet 23 can be discharged from the main water outlet of the flat electronic control unit 20, so that the flat electronic control unit 20 can be conveniently mounted on the motor unit 3 without avoiding the cooling water outlet 23.

[0052] In another embodiment, reference Figure 4 and Figure 5 One embodiment shown and Figures 8-10 In another embodiment shown, one of the motor unit 3 and the flat electronic control unit 20 includes a copper busbar 24, and the other of the motor unit 3 and the flat electronic control unit 20 includes a copper busbar connection end, which is connected to the copper busbar 24. The electronic control housing of the flat electronic control unit 20 includes an openable maintenance cover 25 located at the connection between the copper busbar connection end and the copper busbar 24. Thus, the connection between the copper busbar connection end and the copper busbar 24 facilitates a convenient three-phase electrical connection between the motor unit 3 and the flat electronic control unit 20, making the wheel-side drive assembly more integrated. Furthermore, after the motor unit 3 and the flat electronic control unit 20 are connected, the housings of the motor unit 3 and the flat electronic control unit 20 will cover the copper busbar connection end and the copper busbar 24 to prevent leakage, thus helping to meet protection requirements.

[0053] In another embodiment, the wheel-side drive assembly includes a rotary transformer and a temperature sensor. The rotary transformer and the temperature sensor extend into the motor housing of the motor unit 3, and the connection lines between the rotary transformer and the temperature sensor and the flat electronic control unit 20 are shielded by the electronic control housing of the flat electronic control unit 20 and the motor housing, thus preventing them from being exposed. In other words, after the flat electronic control unit 20 and the motor unit 20 are connected, the connection lines between the rotary transformer and the temperature sensor and the flat electronic control unit 20 are blocked, which helps to meet the protection requirements.

[0054] Finally, the present invention provides a vehicle equipped with any of the wheel-side drive assemblies described above, wherein one of the first output half-shaft 9 and the second output half-shaft 10 serves as the left output half-shaft and the other as the right output half-shaft. The left and right output half-shafts are respectively connected to the left and right wheels of the vehicle for power transmission. In this way, the overall quality of the vehicle is effectively improved.

[0055] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0056] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0057] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A wheel-side drive assembly, characterized in that, Including an integrated motor unit (3), a first gearbox (1), and a second gearbox (2), wherein, The first transmission (1) and the second transmission (2) are respectively disposed on both sides of the motor unit (3) in the vehicle width direction; The motor unit (3) includes a motor housing (17), a first drive motor assembly (18), and a second drive motor assembly (19), wherein, The first drive motor assembly (18) and the second drive motor assembly (19) are disposed within the motor housing (17) and spaced apart in the vehicle length direction. The central axis of each of the first drive motor assembly (18) and the second drive motor assembly (19) is extended along the vehicle width direction to form a first drive motor (4) and a second drive motor (5) sharing the same motor housing (17). The first output shaft (6) of the first drive motor (4) is connected to the first input shaft (7) of the first transmission (1) for power transmission, and the second output shaft of the second drive motor (5) is connected to the second input shaft (8) of the second transmission (2) for power transmission; a portion of one side wall of the motor housing (17) serves as the inner side wall of the first transmission (1), and at least a portion of the other side wall of the motor housing (17) serves as the inner side wall of the second transmission (2); Wherein, the first output half-shaft (9) of the first transmission (1) and the second output half-shaft (10) of the second transmission (2) are arranged on the same half-shaft central axis A, and the half-shaft central axis A is located within the cross-section of the rotor of the first drive motor (4); The motor unit (3) has a motor cooling water channel (21) inside its motor housing. The motor cooling water channel (21) includes a cooling water inlet (22) and a cooling water outlet (23). The motor cooling water channel (21) starts from the cooling water inlet and alternately winds around the first drive motor (4) and the second drive motor (5) to the cooling water outlet (23).

2. The wheel-side drive assembly according to claim 1, characterized in that, The central axis A of the half-shaft coincides with the central axis B of the first drive motor (4).

3. The wheel-side drive assembly according to claim 2, characterized in that, The first transmission (1) includes a first intermediate shaft (11) spaced apart from and arranged parallel to the first input shaft (7) in the vehicle length direction, wherein a first input gear (12) disposed on the first input shaft (7) and a first intermediate gear (13) disposed on the first intermediate shaft (11) mesh.

4. The wheel-side drive assembly according to claim 3, characterized in that, The distance between the first input shaft (7) and the first drive motor (4) and the second drive motor (5) is reduced so that the central axis A of the half shaft is located on the side opposite to the second drive motor (5) of the motor central axis B of the first drive motor (4); The first input shaft (7) is provided with a second input gear (14) with a diameter smaller than the first input gear (12) and replacing the first input gear. The second input gear (14) meshes with the first intermediate gear (13).

5. The wheel-side drive assembly according to claim 1, characterized in that, The distance between the first drive motor (4) and the second drive motor (5) remains unchanged, and the center axis A of the half shaft is located on the side of the motor center axis B of the first drive motor (4) facing away from the second drive motor (5).

6. The wheel-side drive assembly according to claim 1, characterized in that, The first transmission (1) is provided with a support member (15), and the two ends of the first input shaft (7) are respectively supported on the support member (15) and the inner side wall of the first transmission, and the two ends of the first output half shaft (9) are respectively supported on the support member (15) and the outer side wall of the first transmission.

7. The wheel-side drive assembly according to claim 1, characterized in that, In the first transmission, the power transmission path from the first input shaft (7) to the first output half shaft (9) is a U-shaped transmission path; The U-shaped transmission path makes the length of the first transmission in the vehicle length direction less than the length of the second transmission in the vehicle length direction.

8. The wheel-side drive assembly according to claim 1, characterized in that, The first transmission (1) includes a first intermediate shaft (11) spaced apart from and arranged parallel to the first input shaft (7) in the vehicle length direction, the first input shaft (7) and the first output half shaft (9) being located on the same side of the first intermediate shaft (11); The second transmission (2) includes a second intermediate shaft (16) arranged at a distance from the second input shaft (8) in the vehicle length direction, with the second input shaft (8) and the second output half shaft (10) located on both sides of the second intermediate shaft (16); Wherein, the first included angle between the line connecting the axial center of the first input shaft (7) and the axial center of the first intermediate shaft (11) and the line connecting the axial center of the first output half shaft (9) and the axial center of the first intermediate shaft (11) is less than 90°. The second included angle between the line connecting the axial center of the second input shaft (8) and the axial center of the second intermediate shaft (16) and the line connecting the axial center of the second output half shaft (10) and the axial center of the second intermediate shaft (16) is greater than 90°.

9. The wheel-side drive assembly according to any one of claims 1-8, characterized in that, The wheel-side drive assembly includes a flat electronic control unit (20), wherein, in the vehicle height direction, the flat electronic control unit (20) is fixedly connected to the top of the motor unit (3), the first transmission (1) and the second transmission (2).

10. The wheel-side drive assembly according to claim 9, characterized in that, The motor unit (3) has a motor cooling water channel inside its motor housing, and the flat electronic control unit (20) has an electronic control cooling water channel inside its electronic control housing. The motor cooling water channel and the electronic control cooling water channel are sealed and connected.

11. The wheel-side drive assembly according to claim 9, characterized in that, One of the motor unit (3) and the flat electronic control unit (20) includes a copper busbar (24), and the other of the motor unit (3) and the flat electronic control unit (20) includes a copper busbar connection end connected to the copper busbar (24). The electronic control housing of the flat electronic control unit (20) includes an openable maintenance cover (25) located at the connection between the copper busbar connection end and the copper busbar (24).

12. The wheel-side drive assembly according to claim 9, characterized in that, The wheel-side drive assembly includes a rotary transformer and a temperature sensor, wherein the rotary transformer and the temperature sensor extend into the motor housing of the motor unit (3), and the connection lines of the rotary transformer and the temperature sensor to the flat electronic control unit (20) are shielded by the electronic control housing of the flat electronic control unit (20) and the motor housing and are not exposed.

13. A vehicle, characterized in that, The vehicle is provided with a wheel-side drive assembly as described in any one of claims 1-12, wherein one of the first output half-shaft (9) and the second output half-shaft (10) is a left output half-shaft and the other is a right output half-shaft.

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