CN114571986A

CN114571986A - Wheel limit drive assembly and vehicle

Info

Publication number: CN114571986A
Application number: CN202011378538.8A
Authority: CN
Inventors: 杨胜麟; 邹小松; 郭海; 高缘; 李富章
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2020-11-30
Filing date: 2020-11-30
Publication date: 2022-06-03

Abstract

The invention relates to the technical field of wheel-side driving, and discloses a wheel-side driving assembly and a vehicle. The wheel side driving assembly comprises an integrated motor unit and a transmission unit, wherein the transmission unit is arranged on one side of the motor unit in the width direction of the vehicle, and the motor unit comprises a first driving motor and a second driving motor which are integrated together and arranged in the length direction of the vehicle; the transmission unit includes a transmission housing, a first speed change mechanism including a first input shaft, a first intermediate shaft, and a first input gear set, and a second speed change mechanism including a second input shaft, a second intermediate shaft, and a second input gear set, the first input gear set being disposed between the second input gear set and the motor unit; the first output half shaft of the first transmission mechanism and the second output half shaft of the second transmission mechanism are arranged coaxially with a half shaft central axis a. The wheel edge driving assembly is integrated, and has the advantages of compact structure, high space utilization rate, small volume and weight and low cost.

Description

Wheel limit drive assembly and vehicle

Technical Field

The invention relates to the technical field of wheel-side driving, in particular to a wheel-side driving assembly and a vehicle.

Background

With the development of vehicle technology, electric vehicles are becoming more and more popular. For example, a four-wheel independent drive system of an electric vehicle drives four wheels of the vehicle by four motors each independently, and the torque and speed of the four wheels can be precisely controlled independently of each other, thereby bringing a series of advantages such as realization of a smaller radius turn, an auxiliary ESP function, an auxiliary steering function, an auxiliary braking function, and the like.

Generally, a wheel-side driving scheme is often adopted in a four-wheel independent driving system, and in the existing wheel-side driving scheme, a left driving assembly and a right driving assembly are often integrated into a whole, so that the occupied space is large, and the cost is high.

Disclosure of Invention

The invention aims to provide a wheel-side driving assembly which is integrated into a whole, compact in structure, high in space utilization rate, small in volume and weight and low in cost.

In order to achieve the above object, the present invention provides a wheel-side drive assembly including a motor unit and a transmission unit integrated together, the transmission unit being provided on one side of the motor unit in a vehicle width direction, wherein the motor unit includes a first drive motor and a second drive motor integrated together and arranged in a vehicle length direction, respective motor center axes of the first drive motor and the second drive motor being adapted to extend in the vehicle width direction; the transmission unit includes a transmission case, a first speed change mechanism and a second speed change mechanism provided in the transmission case, wherein the first speed change mechanism includes a first input shaft in power transmission connection with the first drive motor, a first intermediate shaft, and a first input gear set connected to the first input shaft and the first intermediate shaft, the second speed change mechanism includes a second input shaft in power transmission connection with the second drive motor, a second intermediate shaft, and a second input gear set connected to the second input shaft and the second intermediate shaft, wherein the first input gear set is arranged between the second input gear set and the motor unit; the first output half shaft of the first transmission mechanism and the second output half shaft of the second transmission mechanism are arranged coaxially with the half shaft center axis a.

In the technical scheme, the motor unit and the transmission unit are integrated together, the motor unit comprises a first driving motor and a second driving motor which are integrated together, arranged in the length direction of the vehicle and transversely arranged along the width direction of the vehicle, so that the first driving motor and the second driving motor can adopt a slender driving motor with a small iron core diameter and a long length, the two driving motors are arranged in parallel in the length direction of the vehicle, the space in the length direction (X direction) of the vehicle is fully utilized, the space occupation of the wheel side driving assembly in the height direction (Z direction) of the vehicle is reduced, the installation space in the Z direction is provided for the subsequent installation of an electronic control unit, meanwhile, the transmission unit is arranged on one side of the motor unit in the width direction of the vehicle, the space in the width direction (Y direction) of the vehicle is fully utilized, and the whole structure of the wheel side driving assembly is compact, the wheel driving assembly has the advantages of high space utilization rate and high integration, so that the wheel driving assembly is compact in structure, high in space utilization rate, small in volume and weight and low in cost.

Further, the second intermediate shaft is an intermediate hollow shaft, the first intermediate shaft passes through the intermediate hollow shaft, and the first input driven gear of the first input gear set is located between the second input driven gear of the second input gear set and the motor unit.

Still further, the first speed change mechanism includes a first output gear set, a first output driving gear of which is provided on a shaft section of the first intermediate shaft passing through the intermediate hollow shaft, and a first output driven gear of which is provided on the first output half shaft.

Further, the second speed change mechanism comprises a second output gear set, a second output driving gear of the second output gear set is arranged on the intermediate hollow shaft, and a second output driven gear of the second output gear set is arranged on the second output half shaft.

Furthermore, the second input shaft is an input hollow shaft, a second input driving gear of the second input gear set is arranged on the input hollow shaft, and the second output half shaft penetrates out of the input hollow shaft.

Further, an axial channel is formed in a central shaft of the second driving motor, and the second output half shaft penetrates out of the axial channel.

Further, 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 greater than 90 °; and a second included angle between a connecting line of the axial center of the second input shaft and the axial center of the second intermediate shaft and a connecting line of the axial center of the second output half shaft and the axial center of the second intermediate shaft is smaller than 90 degrees.

Further, the motor unit includes a motor housing, a first driving motor assembly and a second driving motor assembly, wherein the first driving motor assembly and the second driving motor assembly are disposed in the motor housing and are arranged at intervals in a vehicle length direction, and respective motor assembly central axes of the first driving motor assembly and the second driving motor assembly are configured to extend in a vehicle width direction to form the first driving motor and the second driving motor that share the same motor housing; at least a part of one side wall of the motor housing serves as an inner side wall of the transmission housing.

Further, a motor cooling water channel is arranged in a motor shell of the motor unit and comprises a cooling water inlet and a cooling water outlet, wherein the motor cooling water channel starts from the cooling water inlet and alternately winds the first driving motor and the second driving motor and extends to the cooling water outlet.

In addition, the wheel-side driving assembly comprises a flat electronic control unit, wherein the flat electronic control unit is fixedly connected to the top of the motor unit and the top of the transmission shell in the height direction of the vehicle.

Further, a motor cooling water channel is arranged in a motor shell of the motor unit, an electric control cooling water channel is arranged in an electric control shell of the flat electric control unit, and the motor cooling water channel is communicated with the electric control cooling water channel in a sealing mode.

Further, one of the motor unit and the flat electronic control unit comprises a copper bar, the other of the motor unit and the flat electronic control unit comprises a copper bar connecting end, the copper bar connecting end is connected with the copper bar, and the electronic control shell of the flat electronic control unit comprises a maintenance cover which is positioned at the copper bar connecting end and the copper bar connecting position and can be opened.

Further, the wheel-side driving assembly comprises a rotary transformer and a temperature sensor, wherein the rotary transformer and the temperature sensor extend into a motor shell of the motor unit, and connecting wires between the rotary transformer and the temperature sensor and the flat electronic control unit are shielded by the electronic control shell of the flat electronic control unit and the motor shell and do not leak.

Finally, the present invention provides a vehicle provided with the wheel-drive assembly as described in any of the above, wherein one of the first output half shaft and the second output half shaft serves as a left output half shaft and the other serves as a right output half shaft.

Drawings

FIG. 1 is a schematic view of a wheel-side drive assembly provided by an embodiment of the present invention;

FIG. 2 is a schematic structural view of the flat electronic control unit and the motor unit disassembled in one configuration of the wheel-side drive assembly according to the embodiment of the present invention;

FIG. 3 is a schematic view of a motor cooling water path of a motor unit of the wheel drive assembly according to the exemplary embodiment of the present invention;

FIG. 4 is another schematic view of a motor cooling water path of a motor unit in a wheel-side drive assembly according to an embodiment of the present invention.

Description of the reference numerals

1-a first gear change mechanism, 2-a second gear change mechanism, 3-a motor unit, 4-a first drive motor, 5-a second drive motor, 6-a transmission housing, 7-a first input shaft, 8-a first countershaft, 9-a second input shaft, 10-a second countershaft, 11-a first input gear set, 12-a second input gear set, 13-a first output semi-shaft, 14-a second output semi-shaft, 15-a first input driven gear, 16-a second input driven gear, 17-a motor housing, 18-a first output driving gear, 19-a first output driven gear, 20-a flat electric control unit, 21-a motor cooling water channel, 22-a cooling water inlet, 23-a cooling water outlet, 24-a copper bar, 25-service cover, 26-second output driving gear, 27-second output driven gear, 28-second input driving gear, 29-axial channel, 30-first driving motor assembly, 31-second driving motor assembly.

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

Referring to two schematic configurations shown in fig. 1 and 2, the wheel-side drive assembly provided by the present invention includes a motor unit 3 and a transmission unit that are integrated together, the transmission unit being provided on one side of the motor unit in the vehicle width direction, wherein the motor unit includes a first drive motor 4 and a second drive motor 5 that are integrated together and arranged in the vehicle length direction, the first drive motor 4 and the second drive motor 5 being disposed laterally in the vehicle width direction, that is, respective motor center axes of the first drive motor 4 and the second drive motor 5 are adapted to extend in the vehicle width direction; the transmission unit comprises a transmission housing 6, a first transmission mechanism 1 and a second transmission mechanism 2 arranged in the transmission housing, wherein the first transmission mechanism 1 comprises a first input shaft 7 in power transmission connection with the first drive motor 4, a first intermediate shaft 8 and a first input gear set 11 connected to the first input shaft 7 and the first intermediate shaft 8, the second transmission mechanism 2 comprises a second input shaft 9 in power transmission connection with the second drive motor 5, a second intermediate shaft 10 and a second input gear set 12 connected to the second input shaft 9 and the second intermediate shaft 10, wherein the first input gear set 11 is arranged between the second input gear set 12 and the motor unit 3; the first output half shaft 13 of the first transmission mechanism 1 and the second output half shaft 14 of the second transmission mechanism 2 are arranged coaxially with the axle center axis a.

Because the motor unit and the transmission unit are integrated together, the motor unit comprises a first driving motor and a second driving motor which are integrated together and arranged in the length direction of the vehicle and transversely arranged along the width direction of the vehicle, so that the first driving motor and the second driving motor can adopt slender driving motors with small core diameter and longer length, the two driving motors are arranged in parallel in the length direction of the vehicle, the space in the length direction (X direction) of the vehicle is fully utilized, the space occupation of the wheel side driving assembly in the height direction (Z direction) of the vehicle is reduced, and the installation space in the Z direction is provided for the subsequent installation of an electronic control unit, meanwhile, the transmission unit is arranged on one side of the motor unit in the width direction of the vehicle, so that the space in the width direction (Y direction) of the vehicle is fully utilized, and simultaneously, because the first input gear group is arranged between the second input gear group and the motor unit, therefore, the Y-direction size of the wheel edge driving assembly is reduced, so that the wheel edge driving assembly is compact in overall structure and high in space utilization rate, high integration of the wheel edge driving assembly is realized, and the wheel edge driving assembly is compact in structure, high in space utilization rate, small in volume and weight and low in cost.

In addition, in fig. 1, such structural arrangement of the first transmission mechanism 1 and the second transmission mechanism 2 within the transmission case 6 may also be such that the transmission case 6 forms an empty space at a portion indicated by a dotted line square in fig. 1, and if necessary, a case portion of the transmission case 6 located at the empty space may be removed, thereby forming an escape space at the area of the transmission case 6, which may be provided with other accessories of the wheel-side drive assembly, or may be such that the wheel-side drive assembly may be provided in actual installation, which may accommodate a portion of the structure or accessories provided with the vehicle body.

In this wheel-side drive assembly, the second intermediate shaft 10 may be a solid shaft, and in this case, the power transmission structure between the first output half shaft 13 of the first transmission mechanism 1 and the first intermediate shaft 8 may include other structures such as other gear sets or worm gear sets, and the like.

Alternatively, referring to fig. 1, the second intermediate shaft 10 is an intermediate hollow shaft, so that the first intermediate shaft 8 can pass through the intermediate hollow shaft, so that a power transmission arrangement can be arranged between the shaft section of the first intermediate shaft 8 passing through the intermediate hollow shaft and the first output half shaft 13, while the first input driven gear 15 of the first input gear set 11 is located between the second input driven gear 16 of the second input gear set 12 and the motor unit 3. In this way, the structure of the transmission unit can be made further compact.

In addition, referring to fig. 1, the power transmission structure arranged between the shaft section through which the first intermediate shaft 8 passes out of the intermediate hollow shaft and the first output half shaft 13 may be a plurality of sets of gear sets, or the power transmission structure arranged between the shaft section through which the first intermediate shaft 8 passes out of the intermediate hollow shaft and the first output half shaft 13 may be a set of gear sets, that is, the first speed change mechanism 1 includes a first output gear set of which a first output driving gear 18 is provided on the shaft section through which the first intermediate shaft 8 passes out of the intermediate hollow shaft and of which a first output driven gear 19 is provided on the first output half shaft 13. Thus, referring to fig. 1, the first transmission mechanism 1 can transmit power through two sets of gear sets, so that the structure of the transmission unit is further compact, the weight is reduced, and the cost is reduced.

In addition, in the second transmission mechanism 2, the power transmission mechanism between the second intermediate shaft 10 and the second output axle shaft 14 may include a plurality of sets of gear sets, or the power transmission mechanism between the second intermediate shaft 10 and the second output axle shaft 14 may include a set of gear sets, that is, referring to fig. 1, the second transmission mechanism 2 includes a second output gear set, a second output driving gear 26 of the second output gear set is provided on the intermediate hollow shaft, and a second output driven gear 27 of the second output gear set is provided on the second output axle shaft 14. Thus, referring to fig. 1, the second transmission mechanism 2 can also realize power transmission output through two sets of gear sets, so that the structure of the transmission unit is further compact, the weight is reduced, and the cost is reduced.

In addition, in the wheel-side drive assembly, the second input shaft 9 may be a solid shaft. Alternatively, with reference to fig. 1, the second input shaft 9 is an input hollow shaft on which the second input driving gear 28 of the second input gear set is disposed, and the second output half shaft 14 protrudes from the input hollow shaft, so that, in the embodiment of fig. 1, the first transmission mechanism 1 can transmit power to the first output half shaft 13 through one set of first output gear sets, and the second transmission mechanism 2 can transmit power to the second output half shaft 14 through one set of second output gear sets, while also reducing the diameters of the second output driving gear 26 and the second output driven gear 27, and the first output driving gear 18 and the first output driven gear 19, so that the structure of the transmission unit is further compact.

In addition, in one embodiment, another gear set may be provided between the central shaft of the second driving motor 5 and the second input shaft 9. Alternatively, in another embodiment, referring to fig. 1, the central shaft of the second driving motor 5 is formed with an axial passage 29, and the second output half shaft 14 is extended out from the axial passage 29, so that the central shaft and the second input shaft 9 can be directly connected, thereby making the structure of the transmission unit further compact.

In one embodiment, the second input shaft 9 is an input hollow shaft, the second input driving gear 28 of the second input gear set is disposed on the input hollow shaft, the second output half shaft 14 passes through the input hollow shaft, meanwhile, the central shaft of the second driving motor 5 is formed with an axial passage 29, the second output half shaft 14 passes through the axial passage 29, and the central shaft is directly connected with the second input shaft 9.

In addition, referring to fig. 1, 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 8 and a line connecting the axial center of the first output half shaft 13 and the axial center of the first intermediate shaft 8 is larger than 90 °, and the first angle may be any value larger than 90 °, such as 135 ° to 180 °, which makes it possible to further reduce the width of the transmission unit in the vehicle width direction; a second angle between a line connecting the axial center of the second input shaft 9 and the axial center of the second intermediate shaft 10 and a line connecting the axial center of the second output half shaft 14 and the axial center of the second intermediate shaft 10 is smaller than 90 °, and the second angle may be any value smaller than 90 °, for example, the second angle is 15 ° to 45 °, which may further reduce the width of the transmission unit in the vehicle width direction, make the transmission unit and the motor unit more compact, and further reduce the width dimension of the wheel-side drive assembly.

Further, the respective housings of the first drive motor 4 and the second drive motor 5 may be integrated, for example, welded together, or, as shown with reference to fig. 1, the first drive motor 4 and the second drive motor 5 may share the same motor housing, that is, the motor unit may include a motor housing 17, a first drive motor assembly 30, and a second drive motor assembly 31, wherein the first drive motor assembly 30 and the second drive motor assembly 31 are provided in the motor housing 17 and arranged at intervals in the vehicle length direction and laterally along the vehicle width direction, that is, the respective motor assembly center axes of the first drive motor assembly 30 and the second drive motor assembly 31 are adapted to extend along the vehicle width direction to form the first drive motor 4 and the second drive motor 5 sharing the same motor housing 17, thus forming the first drive motor 4 and the second drive motor 5 integrated together, at least a part of one side wall of the motor housing 17 serves as an inner side wall of the transmission housing 6. In this way, a common side wall can be used between the motor housing 17 and the transmission, thereby further improving the integration of the wheel-side drive assembly.

In addition, referring to fig. 3 and 4, 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 extends from the cooling water inlet to the cooling water outlet 23 in the first driving motor 4 and the second driving motor 5 in an alternating winding manner. Thus, after the cooling water enters the motor cooling water channel 21 from the cooling water inlet 22, the cooling water alternately flows through the first driving motor 4 and the second driving motor 5 in sequence, so that the first driving motor 4 and the second driving motor 5 can be cooled to the same degree, and the balance of heat dissipation is improved.

In addition, it is easier to provide the motor cooling water passage 21 so as to form the same motor housing that is common to the first drive motor 4 and the second drive motor 5.

Of course, alternatively, the cooling water channels on the respective housings of the first driving motor 4 and the second driving motor 5 may be alternately connected in sequence, so that the formed motor cooling water channels 21 alternately extend from the cooling water inlet to the cooling water outlet 23 on the first driving motor 4 and the second driving motor 5 in a winding manner.

The "motor cooling water passage 21 alternately winds and extends from the cooling water inlet to the cooling water outlet 23" on the first drive motor 4 and the second drive motor 5 "may have various modes, for example, in the mode of fig. 3, the motor cooling water passage 21 winds and then winds on the second drive motor 5 (e.g., the second drive motor assembly 31) in the middle of the two drive motors after winding on the first drive motor 4 (e.g., the first drive motor assembly 30) once, and then winds on the first drive motor 4 in the middle of the two drive motors again, and then alternately winds in sequence. In the mode shown in fig. 4, the motor cooling water channel 21 is wound around the first driving motor 4 to the upper part of the middle of the two driving motors, then is bent axially, then is wound around the first driving motor 4 to the lower part of the middle of the two driving motors, then is wound around the second driving motor 5 to the upper part of the middle of the two driving motors, then is bent axially, then is wound around the first driving motor 4 after being wound around the second driving motor 5 to the lower part of the middle of the two driving motors, and is wound alternately in sequence.

Further, a cooling water inlet 22 and a cooling water outlet 23 of the motor cooling water passage 21 are formed at an intermediate position between the first drive motor 4 and the second drive motor 5.

In addition, referring to fig. 2, the wheel-side drive assembly includes a flat electronic control unit 20, wherein the flat electronic control unit 20 is fixedly attached to the top of the motor unit 3 and the transmission case 6 in the vehicle height direction. Thus, since the flat ecu 20 is used, the height of the wheel-side drive assembly in the vehicle height direction can be reduced, and at the same time, the ecu, the motor unit, and the transmission of the wheel-side drive assembly can be made more integrated.

In addition, a motor cooling water channel is arranged in the motor housing of the motor unit 3, and an electronic control cooling water channel is arranged in the electronic control housing of the flat electronic control unit 20, wherein the motor cooling water channel and the electronic control cooling water channel are communicated in a sealing manner. For example, the electrically controlled cooling water channel may be formed with a total water inlet, so that the cooling water enters the electrically controlled cooling water channel from the total water inlet to cool the flat electronic control unit 20, and since the flat shape of the flat electronic control unit 20 may increase the heat dissipation area, and meanwhile, the heat dissipation amount of the flat electronic control unit 20 is small, the temperature of the cooling water does not substantially increase, and thus, the cooling water may continuously flow into the motor cooling water channel to sequentially and alternately cool the two driving motors. The cooling water can be discharged directly from the cooling water outlet 23 of the motor unit 3.

Alternatively, when the flat electronic control unit 20 includes the total water outlet, the cooling water discharged from the cooling water outlet 23 may be discharged from the total water outlet of the flat electronic control unit 20, so that the flat electronic control unit 20 can be easily assembled to the motor unit 3 without avoiding the cooling water outlet 23.

In addition, in an embodiment, referring to fig. 2, one of the motor unit 3 and the flat electronic control unit 20 includes a copper bar 24, and the other of the motor unit 3 and the flat electronic control unit 20 includes a copper bar connecting end connected to the copper bar 24, wherein the electronic control housing of the flat electronic control unit 20 includes an openable maintenance cover 25 at the connecting position of the copper bar connecting end and the copper bar 24. Like this, through the connection of copper bar link and copper bar 24, can realize the three-phase electric connection between motor unit 3 and the platykurtic electrical unit 20 conveniently for this wheel limit drive assembly is more integrated. Further, after the motor unit 3 is connected with the flat electronic control unit 20, the shell of the motor unit 3 and the shell of the flat electronic control unit 20 can shield the copper bar connecting end and the copper bar 24 without leakage, so that the protection requirement can be favorably met.

In addition, in an embodiment, the wheel-side driving 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 respective connection lines between the rotary transformer and the temperature sensor and the flat electronic control unit 20 are shielded by the electronic control housing and the motor housing of the flat electronic control unit 20 without leakage, that is, the respective connection lines between the rotary transformer and the temperature sensor and the flat electronic control unit 20 are shielded after the flat electronic control unit 20 and the motor unit 20 are connected, which is favorable for meeting the protection requirement.

Finally, the invention provides a vehicle provided with a wheel-drive assembly as described in any of the above, wherein one of the first and second

output half shafts

13, 14 is the left output half shaft and the other is the right output half shaft. The left output half shaft and the right output half shaft are respectively in power transmission connection with a left wheel and a right wheel of the vehicle. Thus, the overall quality of the vehicle is effectively improved.

The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications all fall within the protection scope of the present invention.

It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition.

In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.

Claims

1. A wheel-side drive assembly characterized by comprising an electric motor unit (3) and a transmission unit that are integrated together, the transmission unit being disposed on one side of the electric motor unit in a vehicle width direction, wherein,

the motor unit (3) includes a first drive motor (4) and a second drive motor (5) integrated together and arranged in a vehicle length direction, respective motor center axes of the first drive motor (4) and the second drive motor (5) being configured to extend in a vehicle width direction;

the transmission unit comprises a transmission housing (6), a first transmission mechanism (1) and a second transmission mechanism (2) arranged in the transmission housing, wherein the first speed change mechanism (1) comprises a first input shaft (7) in power transmission connection with the first driving motor (4), a first intermediate shaft (8) and a first input gear set (11) connected to the first input shaft (7) and the first intermediate shaft (8), the second speed change mechanism (2) comprises a second input shaft (9) in power transmission connection with the second driving motor (5), a second intermediate shaft (10) and a second input gear set (12) connected to the second input shaft (9) and the second intermediate shaft (10), wherein the first input gear set (11) is arranged between the second input gear set (12) and the motor unit (3);

the first output half shaft (13) of the first transmission mechanism (1) and the second output half shaft (14) of the second transmission mechanism (2) are arranged with a half shaft central axis A.

2. A wheel-side drive assembly according to claim 1, characterised in that the second intermediate shaft (10) is an intermediate hollow shaft through which the first intermediate shaft (8) passes, the first input driven gear (15) of the first input gear set (11) being located between the second input driven gear (16) of the second input gear set (12) and the motor unit (3).

3. A wheel-drive assembly according to claim 2, characterized in that the first speed change mechanism (1) comprises a first output gear set, a first output driving gear (18) of which is arranged on a shaft section of the first intermediate shaft (8) passing through the intermediate hollow shaft, and a first output driven gear (19) of which is arranged on the first output half shaft (13).

4. A wheel-drive assembly according to claim 2, characterized in that the second gear change mechanism (2) comprises a second output gear set, a second output driving gear (26) of which is arranged on the intermediate hollow shaft and a second output driven gear (27) of which is arranged on the second output half shaft (14).

5. A wheel-drive assembly according to claim 1, characterized in that the second input shaft (9) is an input hollow shaft on which the second input driving gear (28) of the second input gear set is arranged, and the second output half shaft (14) protrudes from the input hollow shaft.

6. A wheel-rim drive assembly according to claim 1, characterized in that the central shaft of the second drive motor (5) is formed with an axial channel (29), the second output half-shaft (14) passing out of the axial channel (29).

7. A wheel-edge drive assembly according to claim 1, characterized in that a first angle between a line connecting the axial centre of the first input shaft (7) and the axial centre of the first intermediate shaft (8) and a line connecting the axial centre of the first output half shaft (13) and the axial centre of the first intermediate shaft (8) is greater than 90 °;

and a second included angle between a connecting line of the axial center of the second input shaft (9) and the axial center of the second intermediate shaft (10) and a connecting line of the axial center of the second output half shaft (14) and the axial center of the second intermediate shaft (10) is smaller than 90 degrees.

8. A wheel-rim drive assembly according to claim 1, characterized in that the motor unit comprises a motor housing (17), a first drive motor assembly (30) and a second drive motor assembly (31), wherein,

the first driving motor assembly (30) and the second driving motor assembly (31) are arranged in the motor shell (17) at intervals in the length direction of the vehicle, and the central axes of the first driving motor assembly (30) and the second driving motor assembly (31) are used for extending along the width direction of the vehicle to form the first driving motor (4) and the second driving motor (5) sharing the same motor shell (17);

at least one part of one side wall of the motor shell (17) is used as the inner side wall of the transmission shell (6).

9. A wheel-rim drive assembly according to claim 1, characterized in that a motor cooling water channel (21) is provided in the motor housing of the motor unit (3), the motor cooling water channel (21) comprising a cooling water inlet (22) and a cooling water outlet (23), wherein the motor cooling water channel (21) extends from the cooling water inlet to the cooling water outlet (23) alternately on the first drive motor (4) and the second drive motor (5).

10. Wheel-rim drive assembly according to any of claims 1-9, characterized in that it comprises a flat electronic control unit (20), wherein the flat electronic control unit (20) is fixedly connected to the top of the motor unit (3) and the transmission housing (6) in the vehicle height direction.

11. A wheel-rim drive assembly according to claim 10, wherein a motor cooling water channel is provided in the motor housing of the motor unit (3) and an electronically controlled cooling water channel is provided in the electronically controlled housing of the flat electronic control unit (20), wherein the motor cooling water channel and the electronically controlled cooling water channel are in sealed communication.

12. A wheel-rim drive assembly according to claim 10, wherein one of the electric motor unit (3) and the flat-shaped electric control unit (20) comprises a copper bar (24) and the other of the electric motor unit (3) and the flat-shaped electric control unit (20) comprises a copper bar connection end connected with the copper bar (24), wherein the electric control housing of the flat-shaped electric control unit (20) comprises an openable service cover (25) at the connection of the copper bar connection end and the copper bar (24).

13. Wheel-side drive assembly according to claim 10, characterized in that it comprises a resolver and a temperature sensor, wherein the resolver and the temperature sensor protrude into a motor housing of the motor unit (3) and their respective connection lines to the flat electronic control unit (20) are shielded from external leakage by the electronic control housing and the motor housing of the flat electronic control unit (20).

14. A vehicle, characterized in that it is provided with a wheel-drive assembly according to any one of claims 1-13, wherein one of said first (13) and second (14) output half shafts is the left output half shaft and the other is the right output half shaft.