Wheel drive assembly and vehicle

Abstract

The present invention discloses a wheel-side drive assembly and a vehicle. The wheel-side drive assembly comprises: a first drive motor and a second drive motor, the first drive motor and the second drive motor are arranged front and rear along the length direction of the vehicle, and the central axes of the first drive motor and the second drive motor extend along the width direction of the vehicle; a first transmission and a second transmission, the first transmission and the second transmission are arranged on both sides of the first drive motor and the second drive motor in the width direction of the vehicle, respectively, along the length direction of the vehicle, the first transmission also comprises a first output half shaft, the central axis of the first output half shaft is arranged parallel or collinear with the central axis of the first output shaft; along the length direction of the vehicle, the second transmission also comprises a second output half shaft, the second output half shaft and the second output shaft are arranged parallel, and the first output half shaft and the second output half shaft are arranged collinearly.

Description

[0001] This application is a divisional application with application number: 202011378556.6, application date: November 30, 2020, and invention name: "Wheel-side drive assembly and vehicle" Technical Field

[0002] The invention relates to the technical field of wheel-side drive, and in particular to a wheel-side drive assembly and a vehicle. Background Art

[0003] With the development of vehicle technology, electric vehicles are becoming more and more popular. For example, the four-wheel independent drive system of electric vehicles uses four motors to independently drive the four wheels of the vehicle. The torque and speed of the four wheels can be accurately controlled independently of each other, which brings a series of advantages, such as achieving smaller radius turns, assisting ESP functions, assisting steering functions, assisting braking functions, etc.

[0004] Generally, a wheel-side drive solution is often used in a four-wheel independent drive system. In the existing wheel-side drive solution, the left and right drive assemblies are often self-contained, occupying a large space and having a high cost. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a wheel side drive assembly with compact structure and high space utilization.

[0006] The present invention also provides a vehicle having the wheel-side drive assembly.

[0007] According to an embodiment of the present invention, the wheel-side drive assembly includes: a first drive motor and a second drive motor, the first drive motor and the second drive motor are arranged front and rear along the length direction of the vehicle, and the central axes of the first drive motor and the second drive motor extend along the width direction of the vehicle; a first transmission and a second transmission, the first transmission and the second transmission are respectively arranged on both sides of the first drive motor and the second drive motor in the width direction of the vehicle, 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; the first transmission also includes a first output half shaft, and the central axis of the first output half shaft is parallel or collinearly arranged with the central axis of the first output shaft; the second transmission also includes a second output half shaft, the second output half shaft is parallel to the second output shaft, and the first output half shaft and the second output half shaft are collinearly arranged.

[0008] In some embodiments of the present invention, the power transmission path from the first input shaft to the first output half shaft is a U-shaped transmission path.

[0009] In some embodiments of the present invention, the first transmission also includes a first intermediate shaft, which is spaced apart from the first input shaft in the length direction of the vehicle, and a first angle between a line connecting the axial center of the first input shaft and the axial center of the first intermediate shaft and a line connecting the axial center of the first output half shaft and the axial center of the first intermediate shaft is less than 90°.

[0010] In some embodiments of the present invention, the first transmission further includes a first intermediate shaft, which is spaced apart from the first input shaft in the length direction of the vehicle, and the first input shaft and the first output half shaft are located on the same side of the first intermediate shaft.

[0011] In some embodiments of the present invention, the first input shaft and the first output half shaft are located on a side of the first intermediate shaft facing a central axis of the first drive motor.

[0012] In some embodiments of the present invention, in a vehicle length direction, the length of the first transmission is shorter than the length of the second transmission.

[0013] In some embodiments of the present invention, the first transmission further includes a primary reduction gear set and a secondary reduction gear set, and the primary reduction gear set is located on the side of the secondary reduction gear set facing the first drive motor.

[0014] In some embodiments of the present invention, the first-stage reduction gear set includes: a first input gear, which is arranged on the first input shaft; a first intermediate gear, which is arranged on the first intermediate shaft, the first intermediate gear is meshed with the first input gear, and the diameter of the first intermediate gear is larger than the diameter of the first input gear.

[0015] In some embodiments of the present invention, the two-stage reduction gear set includes: a first mating gear, which is arranged on the first intermediate shaft to rotate synchronously with the first intermediate gear, and the diameter of the first mating gear is smaller than the diameter of the first intermediate gear; a first output gear, which is arranged on the first output half shaft, the first output gear and the first mating gear are meshed, and the diameter of the first output gear is larger than the diameter of the first mating gear.

[0016] In some embodiments of the present invention, the second transmission further includes a second intermediate shaft, which is spaced apart from the second input shaft in the length direction of the vehicle, and the second input shaft and the second output half shaft are located on both sides of the second intermediate shaft.

[0017] In some embodiments of the present invention, the second transmission also includes: a third input gear, the third input gear is arranged on the second input shaft; a second intermediate gear, the second intermediate gear is arranged on the second intermediate shaft, and the second intermediate gear is meshed with the third input gear; a second mating gear, the second mating gear is arranged on the second intermediate shaft to rotate synchronously with the second intermediate gear, and the diameter of the second mating gear is smaller than the diameter of the second intermediate gear; a second output gear, the second output gear is arranged on the second output half shaft, the second output gear is meshed with the second mating gear, and the diameter of the second output gear is larger than the diameter of the second mating gear.

[0018] In some embodiments of the present invention, a support member is provided in the first transmission, and both ends of the first input shaft are respectively supported on the support member and the inner side wall of the first transmission, and both ends of the first output half shaft are respectively supported on the support member and the outer side wall of the first transmission.

[0019] In some embodiments of the present invention, both the first transmission and the second transmission are two-stage speed reducers.

[0020] In some embodiments of the present invention, the primary reduction gear set of the first transmission and the primary reduction gear set of the second transmission are centrally symmetrically arranged, and the secondary reduction gear set of the first transmission and the secondary reduction gear set of the second transmission are mirror-symmetrically arranged.

[0021] In some embodiments of the present invention, the wheel-side drive assembly includes a flat electronic control unit, wherein in the height direction of the vehicle, the flat electronic control unit is fixedly connected to the top of the first drive motor and the second drive motor.

[0022] The vehicle according to the embodiment of the present invention comprises the wheel drive assembly according to the above embodiment of the present invention.

[0023] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0025] Figure 1 It is a schematic diagram of a wheel side drive assembly provided in a specific embodiment of the present invention;

[0026] Figure 2 is another schematic diagram of a wheel side drive assembly provided in a specific embodiment of the present invention;

[0027] Figure 3 It is a three-dimensional structural schematic diagram of a wheel side drive assembly provided in a specific embodiment of the present invention;

[0028] Figure 4 yes Figure 3 A schematic diagram of the disassembled structure of the flat electronic control unit and the motor unit of the wheel side drive assembly;

[0029] Figure 5 yes Figure 3 The exploded state diagram of the wheel side drive assembly;

[0030] Figure 6 It is a schematic diagram of a motor cooling water channel of a motor unit in a wheel side drive assembly provided in a specific embodiment of the present invention;

[0031] Figure 7 It is another schematic diagram of a motor cooling water channel of a motor unit in a wheel side drive assembly provided in a specific embodiment of the present invention;

[0032] Figure 8 It is another three-dimensional structural schematic diagram of a wheel side drive assembly provided in a specific embodiment of the present invention;

[0033] Fig. 9 yes Figure 8 The exploded state diagram of the wheel side drive assembly;

[0034] Fig.10 yes Fig. 9 Schematic diagram of the disassembled structure of the flat electronic control unit and the motor unit of the wheel-side drive assembly.

[0035] Reference numerals:

[0036] 1-first transmission, 2-second transmission, 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, 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 bar, 25-maintenance cover DETAILED DESCRIPTION

[0037] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0038] refer to Figure 1 and Figure 2 As shown in the two schematic structures, the wheel-side drive assembly provided by the present invention includes a motor unit 3, a first transmission 1 and a second transmission 2 which are integrated together, wherein 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 a first drive motor 4 and a second drive motor 5 which are integrated together and arranged in the vehicle length direction and transversely placed along the vehicle width direction, that is, the motor center axis of the first drive motor 4 and the second drive motor 5 are respectively 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; 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 with the half shaft center axis A, and the half shaft center axis A is located in the cross section of the rotor of the first drive motor 4.

[0039] Since the motor unit, the first transmission and the second transmission are integrated together, the first transmission and the second transmission are respectively arranged on both sides of the motor unit in the vehicle width direction. At the same time, the motor unit includes a first drive motor and a second drive motor that are integrated together and arranged in the vehicle length direction and horizontally arranged along the vehicle width direction. In this way, the height of the motor unit in the vehicle height direction can be reduced. At the same time, the first output half shaft of the first transmission and the second output half shaft of the second transmission are arranged with the half shaft center axis A, and the half shaft center axis A is located in the cross-section of the rotor of the first drive motor. In this way, the power transmission structure in the first transmission can be compact and the length of the first transmission in the vehicle length direction can be reduced. At the same time, the first output half shaft and the second output half shaft are arranged close to the first drive motor to meet the vehicle layout requirements and avoid interference with the subframe or the body. Therefore, the wheel-side drive assembly is integrated into one, with compact structure, high space utilization, small volume and weight, and low cost.

[0040] In addition, in the wheel-side drive assembly, the half-shaft center axis A can be located at any position within the cross section of the rotor of the first drive motor 4. For example, in one embodiment, the half-shaft center axis A 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 1 , the half shaft center axis A coincides with the motor 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 be in the first position. In this way, the power transmission structure in the first transmission can be made more compact, and the length of the first transmission in the vehicle length direction can be further reduced.

[0041] In addition, the first transmission 1 may have a power transmission mechanism, such as a plurality of gear sets or a worm gear set. Figure 1 The first transmission 1 includes a first intermediate shaft 11 which is spaced apart from and arranged in parallel with the first input shaft 7 in the length direction of the vehicle. The first input gear 12 provided on the first input shaft 7 is meshed with the first intermediate gear 13 provided on the first intermediate shaft 11. 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 the first intermediate gear 13, and the first intermediate shaft 11 transmits the rotational force to the subsequent power transmission mechanism.

[0042] 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 at the second position closer to the second drive motor 5 than the first position, that is, the distance between the first drive motor 4 and the second drive motor 5 is shortened so that the half-shaft center axis A is located on the side of the motor center axis B of the first drive motor 4 that is away from the second drive motor 5; at the same time, in the second position, the first input shaft 7 is provided with a second input gear 14 having a smaller diameter than the first input gear 12 and replacing the first input gear, and the second input gear 14 is meshed with the first intermediate gear 13. In this way, the diameter of the second input gear 14 can be further reduced, so that the structural size of the first transmission 1 is more compact.

[0043] In addition, in an alternative embodiment, reference Figure 2 , the distance between the first drive motor 4 and the second drive motor 5 remains unchanged, and the half-shaft center axis A is located on the side of the motor center axis B of the first drive motor 4 that faces away from the second drive motor 5. 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 accordingly according to the actual layout requirements of the wheel-side drive assembly on the vehicle model, so as to meet the layout of different vehicle models, meet the layout requirements of the entire vehicle, and avoid interference with the subframe or the vehicle body.

[0044] In addition, refer to Figure 1 and Figure 2A support member 15 is provided in the first transmission 1, and both 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 both 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, since the structure of the first transmission 1 is more compact, the first output half shaft 9 and the first input shaft 7 can be isolated and supported by the support member 15, thereby shortening the length of the first output half shaft 9 and the first input shaft 7 in the vehicle width direction, reducing the width of the first transmission in the vehicle width direction, and making the first transmission more compact.

[0045] In addition, 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 smaller 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 make the power transmission mechanism in the first transmission more simplified and compact.

[0046] In addition, refer to Figure 1 and Figure 2 The first transmission 1 includes a first intermediate shaft 11 which is spaced apart from and arranged in parallel with the first input shaft 7 in the vehicle length direction, and the first input shaft 7 and the first output half shaft 9 are located on the same side of the first intermediate shaft 11, so that, for example, the power transmission path from the first input shaft 7 to the first output half shaft 9 can be a U-shaped transmission path. At the same time, the second transmission 2 includes a second intermediate shaft 16 which is spaced apart from the second input shaft 8 in the vehicle length direction, and the second input shaft 8 and the second output half shaft 10 are located on both sides of the second intermediate shaft 16; wherein, a first angle between a line connecting the axial center of the first input shaft 7 and the axial center of the first intermediate shaft 11 and a 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°, so that the width of the first transmission in the vehicle width direction can be further reduced; a second angle between a line connecting the axial center of the second input shaft 8 and the axial center of the second intermediate shaft 16 and a 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 180°, so that the width of the second transmission in the vehicle width direction can be further reduced.

[0047] In addition, the housings of the first drive motor 4 and the second drive motor 5 can be integrated, for example, welded together, or, as shown in FIG. Figure 1-Figure 5As 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, wherein the first drive motor assembly 18 and the second drive motor assembly 19 are arranged in the motor housing 17 and are arranged at intervals in the vehicle length direction and are transversely arranged along the vehicle width direction, that is, the motor assembly center axis of each of the first drive motor assembly 18 and the second drive motor assembly 19 is used to extend along the vehicle width direction to form the first drive motor 4 and the second drive motor 5 that share the same motor housing 17, thus forming the first drive motor 4 and the second drive motor 5 that are integrated together, a part of the side wall of one side of the motor housing 17 is used as the inner side wall of the first transmission 1, and at least a part of the side wall of the other side of the motor housing 17 is used as the inner side wall of the second transmission 2. In this way, the side wall can be shared between the motor housing 17 and the transmission, thereby further improving the integration of the wheel-side drive assembly.

[0048] In addition, refer to Figure 6 and Figure 7 As shown, a motor cooling water channel 21 is provided in the motor housing of the motor unit 3, and the motor cooling water channel 21 includes a cooling water inlet 22 and a cooling water outlet 23, wherein the motor cooling water channel 21 is alternately wound around the first drive motor 4 and the second drive motor 5 from the cooling water inlet and extends 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 alternately flow 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 be cooled to the same extent, and improving the balance of heat dissipation.

[0049] In addition, the same motor housing shared by the first drive motor 4 and the second drive motor 5 is easier to be provided with such a motor cooling water channel 21 .

[0050] Of course, optionally, the cooling water channels on the respective shells of the first drive motor 4 and the second drive motor 5 can also be connected alternately in sequence, so that the formed motor cooling water channel 21 starts from the cooling water inlet and alternately winds on the first drive motor 4 and the second drive motor 5 to extend to the cooling water outlet 23.

[0051] The motor cooling water channel 21 starts from the cooling water inlet and is alternately wound around the first drive motor 4 and the second drive motor 5 and extends to the cooling water outlet 23. There are many ways, for example, Figure 6 In the manner, the motor cooling water channel 21 is wound around the first drive motor 4 (for example, the first drive motor assembly 18) once, then wound around the second drive motor 5 (for example, the second drive motor assembly 19) in the middle of the two drive motors, and then wound around the first drive motor 4 in the middle of the two drive motors, and the winding is alternated in sequence. Figure 7 In the method, the motor cooling water channel 21 is wound around the first drive motor 4 to the upper part in the middle of the two drive motors, then axially bends and returns to be wound around the first drive motor 4 to the lower part in the middle of the two drive motors, and then is wound around the second drive motor 5 to the upper part in the middle of the two drive motors, then axially bends and returns to be wound around the second drive motor 5 to the lower part in the middle of the two drive motors, and then is wound around the first drive motor 4, and the windings are alternately performed in sequence.

[0052] Further, the cooling water inlet 22 and the cooling water outlet 23 of the motor cooling water channel 21 are formed at a middle position between the first drive motor 4 and the second drive motor 5 .

[0053] In addition, refer to Figure 3 , Figure 4 and Figure 5 The wheel side drive assembly includes a flat electric control unit 20, wherein in the vehicle height direction, the flat electric control unit 20 is fixedly connected to the top of the motor unit 3, the first transmission 1 and the second transmission 2. Thus, by adopting the flat electric control unit 20, the height of the wheel side drive assembly in the vehicle height direction can be reduced, and at the same time, the electric control unit, the motor unit and the transmission of the wheel side drive assembly can be more integrated.

[0054] In addition, a motor cooling water channel is provided in the motor housing of the motor unit 3, and an electric control cooling water channel is provided in the electric control housing of the flat electric control unit 20, wherein the motor cooling water channel and the electric control cooling water channel are sealed and connected. For example, the electric control cooling water channel can be provided with a total water inlet, so that the cooling water enters the electric control cooling water channel from the total water inlet to cool the flat electric control unit 20. Since the flat shape of the flat electric control unit 20 can increase the heat dissipation area, and at the same time, the heat dissipation of the flat electric control unit 20 is small, the temperature of the cooling water will basically not rise, so it can continue to flow into the motor cooling water channel to cool the two drive motors alternately in sequence. The cooling water can be directly discharged from the cooling water outlet 23 of the motor unit 3.

[0055] Alternatively, optionally, when the flat electronic control unit 20 includes a total water outlet, the cooling water discharged from the cooling water outlet 23 can be discharged from the total water outlet of the flat electronic control unit 20, so that the flat electronic control unit 20 can be conveniently assembled on the motor unit 3 without avoiding the cooling water outlet 23.

[0056] In addition, in one embodiment, reference Figure 4 and Figure 5 An embodiment shown and Figure 8-Figure 10In another embodiment shown, one of the motor unit 3 and the flat electric control unit 20 includes a copper bar 24, and the other of the motor unit 3 and the flat electric control unit 20 includes a copper bar connection end, and the copper bar connection end is connected to the copper bar 24, wherein the electric control housing of the flat electric control unit 20 includes an openable maintenance cover 25 located at the connection between the copper bar connection end and the copper bar 24. In this way, through the connection between the copper bar connection end and the copper bar 24, the three-phase electrical connection between the motor unit 3 and the flat electric control unit 20 can be conveniently achieved, making the wheel-side drive assembly more integrated. Furthermore, after the motor unit 3 and the flat electric control unit 20 are connected, the housing of the motor unit 3 and the housing of the flat electric control unit 20 will shield the copper bar connection end and the copper bar 24 from leaking out, which can help meet the protection requirements.

[0057] In addition, in one embodiment, the wheel-side drive assembly includes a rotating transformer and a temperature sensor, wherein the rotating transformer and the temperature sensor extend into the motor housing of the motor unit 3, and the connection lines between the rotating transformer and the temperature sensor and the flat electric control unit 20 are respectively blocked by the electric control housing and the motor housing of the flat electric control unit 20 and do not leak out. That is, after the flat electric control unit 20 and the motor unit 20 are connected, the connection lines between the rotating transformer and the temperature sensor and the flat electric control unit 20 are respectively blocked, which can help meet the protection requirements.

[0058] Finally, the present invention provides a vehicle, which is provided with any of the above-mentioned wheel-side drive assemblies, wherein one of the first output half shaft 9 and the second output half shaft 10 is used as a left output half shaft and the other is used as a right output half shaft. The left output half shaft and the right output half shaft are respectively connected to the left wheel and the right wheel of the vehicle for power transmission. In this way, the overall quality of the vehicle is effectively improved.

[0059] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0060] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0061] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A wheel drive assembly, characterized in that: include: A first drive motor (4) and a second drive motor (5), wherein the first drive motor (4) and the second drive motor (5) are arranged front and rear along the length direction of the vehicle, and central axes of the first drive motor (4) and the second drive motor (5) extend along the width direction of the vehicle; A first transmission (1) and a second transmission (2), wherein the first transmission (1) and the second transmission (2) are respectively arranged on both sides of the first drive motor (4) and the second drive motor (5) in the vehicle width direction, a first output shaft (6) of the first drive motor (4) is connected to a first input shaft (7) of the first transmission (1) for power transmission, and a second output shaft of the second drive motor (5) is connected to a second input shaft (8) of the second transmission (2) for power transmission; The first transmission (1) further comprises a first output half shaft (9), wherein a central axis of the first output half shaft (9) is arranged parallel or co-linearly with a central axis of the first output shaft; The second transmission (2) further comprises a second output half shaft (10), the second output half shaft and the second output shaft being arranged in parallel; The first output half shaft (9) and the second output half shaft (10) are arranged collinearly; A support member (15) is provided in the first transmission (1), 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 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 (1); The first drive motor (4) and the second drive motor (5) are arranged at an interval, and the distance between the two motors remains unchanged, and the half-shaft central axis A is located on the side of the motor central axis B of the first drive motor (4) that is away from the second drive motor (5).

2. The wheel side drive assembly according to claim 1, characterized in that: The power transmission path from the first input shaft (7) to the first output half shaft (9) is a U-shaped transmission path.

3. The wheel side drive assembly according to claim 1, characterized in that: The first transmission (1) further comprises a first intermediate shaft (11), the first intermediate shaft (11) being arranged at an interval from the first input shaft (7) in the longitudinal direction of the vehicle, and a first angle between a line connecting the axial center of the first input shaft (7) and the axial center of the first intermediate shaft (11) and a line connecting the axial center of the first output half shaft (9) and the axial center of the first intermediate shaft (11) being less than 90°.

4. The wheel side drive assembly according to claim 1, characterized in that: The first transmission (1) further comprises a first intermediate shaft (11), the first intermediate shaft (11) being arranged at an interval from the first input shaft (7) in the length direction of the vehicle, and the first input shaft (7) and the first output half shaft (9) being located on the same side of the first intermediate shaft (11).

5. The wheel side drive assembly according to claim 4, characterized in that: The first input shaft (7) and the first output half shaft (9) are located on a side of the first intermediate shaft (11) facing the central axis of the first drive motor (4).

6. The wheel side drive assembly according to claim 1, characterized in that: In the vehicle length direction, the length of the first transmission (1) is shorter than the length of the second transmission (2).

7. The wheel drive assembly according to claim 1, characterized in that: The first transmission (1) further comprises a primary reduction gear set and a secondary reduction gear set, wherein the primary reduction gear set is located on a side of the secondary reduction gear set facing the first drive motor (4).

8. The wheel side drive assembly according to claim 7, characterized in that: The primary reduction gear set comprises: A first input gear (12), the first input gear (12) being arranged on the first input shaft (7); A first intermediate gear (13), the first intermediate gear (13) being arranged on the first intermediate shaft (11), the first intermediate gear (13) being meshed with the first input gear (12), and the diameter of the first intermediate gear (13) being greater than the diameter of the first input gear (12).

9. The wheel side drive assembly according to claim 8, characterized in that: The secondary reduction gear set comprises: a first mating gear, the first mating gear being arranged on the first intermediate shaft (11) so as to rotate synchronously with the first intermediate gear (13), the diameter of the first mating gear being smaller than the diameter of the first intermediate gear (13); A first output gear, wherein the first output gear is arranged on the first output half shaft (9), the first output gear is meshed with the first matching gear, and the diameter of the first output gear is greater than the diameter of the first matching gear.

10. The wheel side drive assembly according to claim 1, characterized in that: The second transmission (2) further comprises a second intermediate shaft (16), the second intermediate shaft (16) being arranged at an interval from the second input shaft (8) in the length direction of the vehicle, and the second input shaft (8) and the second output half shaft (10) being located on both sides of the second intermediate shaft (16).

11. The wheel side drive assembly according to claim 10, characterized in that: The second transmission further includes: a third input gear, the third input gear being arranged on the second input shaft (8); a second intermediate gear, the second intermediate gear being arranged on the second intermediate shaft (16), the second intermediate gear being meshed with the third input gear; a second mating gear, the second mating gear being arranged on the second intermediate shaft (16) so as to rotate synchronously with the second intermediate gear, the diameter of the second mating gear being smaller than the diameter of the second intermediate gear; A second output gear, wherein the second output gear is arranged on the second output half shaft (10), the second output gear is meshed with the second matching gear, and the diameter of the second output gear is greater than the diameter of the second matching gear.

12. The wheel drive assembly according to claim 1, characterized in that: The first transmission (1) and the second transmission (2) are both two-stage speed reducers.

13. The wheel side drive assembly according to claim 12, characterized in that: The primary reduction gear set of the first transmission (1) and the primary reduction gear set of the second transmission (2) are arranged in a center-symmetrical manner, and the secondary reduction gear set of the first transmission (1) and the secondary reduction gear set of the second transmission (2) are arranged in a mirror-symmetrical manner.

14. The wheel drive assembly according to any one of claims 1 to 13, characterized in that: The wheel side drive assembly comprises a flat electric control unit (20), wherein in the vehicle height direction, the flat electric control unit (20) is fixedly connected to the top of the first drive motor (4) and the second drive motor (5).

15. A vehicle, characterized in that: It comprises a wheel drive assembly according to any one of claims 1-14.

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