WO2022166952A1

WO2022166952A1 - Coaxial electric drive system and vehicle

Info

Publication number: WO2022166952A1
Application number: PCT/CN2022/075363
Authority: WO
Inventors: 宋鹏飞; 刘欢; 李锋勇; 高方; 李伯洋; 张小波
Original assignee: 中国第一汽车股份有限公司
Priority date: 2021-02-07
Filing date: 2022-02-07
Publication date: 2022-08-11
Also published as: CN112895808A

Abstract

A coaxial electric drive system and a vehicle; the coaxial electric drive system comprises a motor housing (11), a speed reduction device housing (12), a differential housing (13), a motor, a speed reduction device, a differential (4) and a disconnection device (5); the motor comprises a first half shaft (231) and a second half shaft (232) which are coaxially arranged; the speed reduction device is arranged in the speed reduction device housing (12); the speed reduction device comprises a sun gear (31), a first planet gear (32), a second planet gear (33) and a ring gear (34); the ring gear (34) is arranged on the speed reduction device housing (12); the first planet gear (32) and the second planet gear (33) are rotatably arranged on the differential housing (13); at least a part of the differential (4) is located between the second planet gear (33) and the first half shaft (231); and the disconnection device (5) is provided at the end of the first half shaft (231) away from the second half shaft (232), and the disconnection device (5) is configured to selectively connect or disconnect the first half shaft (231) and a wheel hub. The coaxial electric drive system has a compact structure and high integration, and can realize the switching of four-wheel drive or hybrid drive of a vehicle, being more energy-saving and emission-reducing.

Description

Coaxial electric drive system and vehicle

This application claims the priority of the Chinese patent application with an application date of February 7, 2021 and an application number of 202110179778.3, the entire contents of which are incorporated herein by reference.

technical field

The present application relates to the technical field of vehicles, for example, to a coaxial electric drive system and a vehicle.

Background technique

In the related art, electric drive axles of electric vehicles are generally divided into two types: parallel shaft type and coaxial type. Among them, the coaxial electric drive axle mostly adopts a parallel shaft gear train, that is, the motor shaft and the hub shaft are concentric.

In order to realize the functions of deceleration and differential speed of the electric drive axle, the electric drive axle is usually provided with a deceleration device and a differential, which leads to a further increase in the radial space occupied by the coaxial electric drive axle, which makes the layout of the whole vehicle more difficult. ; At the same time, some electric drive axles do not have a disconnect device in order to reduce the axial size, so that the electric drive axles work all the time, which makes the vehicle unable to switch between four-wheel drive or hybrid, resulting in high energy consumption and reduced vehicle economy. .

SUMMARY OF THE INVENTION

The present application provides a coaxial electric drive system and a vehicle, which have a compact structure, a high degree of integration, and are more energy-saving and emission-reducing.

An embodiment provides a coaxial electric drive system, including: a motor housing; a reduction gear housing connected to the motor housing; a differential housing arranged in the reduction gear housing; The motor housing includes a relatively rotating rotor and a stator, the rotor is arranged on the motor shaft, and the motor shaft includes a coaxially arranged first half shaft and a second half shaft; a speed reduction device is arranged on the speed reducer Inside the device casing, the speed reduction device includes a sun gear arranged on the first half shaft, a first planetary gear meshed with the sun gear, and a second planetary gear coaxial with the first planetary gear and fixedly arranged a wheel, and a ring gear meshing with the second planetary gear, the ring gear is arranged on the reduction gear housing, and the first planetary gear and the second planetary gear are rotatably arranged on the differential housing upper; a differential, arranged in the differential housing, the differential is arranged between the first half shaft and the second half shaft, and the differential is at least partially located in the first half shaft between the two planetary gears and the first half shaft; and a disconnecting device, which is arranged at one end of the first half shaft away from the second half shaft, and the disconnecting device is configured to selectively connect or disconnect all Describe the first half shaft and the hub.

An embodiment also provides a vehicle including the above-mentioned coaxial electric drive system.

Description of drawings

1 is a schematic diagram of a coaxial electric drive system provided by an embodiment of the present application;

2 is a schematic diagram of a disconnecting device (a sleeve body that hides a tooth sleeve) provided in an embodiment of the present application in a disconnected position;

3 is a schematic diagram of the disconnecting device (the sleeve body that hides the tooth sleeve) provided in an embodiment of the present application in a connected position;

4 is a schematic diagram of a first half shaft of a disconnecting device provided by an embodiment of the present application;

5 is a schematic diagram of a gear hub of a disconnecting device provided by an embodiment of the present application;

6 is a schematic diagram of a coupling of a disconnecting device provided by an embodiment of the present application;

FIG. 7 is a schematic diagram of a tooth sleeve of a disconnecting device provided by an embodiment of the present application.

In the picture:

11. Motor housing; 111. Front housing; 112. Rear housing; 12. Reduction gear housing; 13. Differential housing; 14. First end cover; 15. Second end cover;

21, rotor; 22, stator; 23, motor shaft; 231, first half shaft; 2311, second meshing tooth; 232, second half shaft;

31, sun gear; 32, first planetary gear; 33, second planetary gear; 34, ring gear; 35, planetary gear shaft; 36, needle bearing; 37, shaft pin;

4. Differential; 41. The first bearing; 42. The second bearing;

5. Disconnect the device;

51, coupling; 511, limit groove; 5111, deep groove; 5112, shallow groove; 512, guide groove; 513, second guide surface;

52, tooth sleeve; 521, sleeve body; 522, guide tooth; 5221, first inclined surface; 5222, first abutting surface; 523, ring groove;

53, tooth hub; 531, first meshing tooth; 532, limit protrusion; 5321, high protrusion; 5322, low protrusion; 533, top column; 5331, second slope; 5332, second abutting surface; 534. The first guide surface;

54. Drive parts.

Detailed ways

As shown in FIG. 1 , the present embodiment provides a coaxial electric drive system for a vehicle, the device includes a motor, a reduction device, a differential 4 and a disconnect device 5 , wherein the motor is placed in a motor housing 11 , the motor includes a relatively rotating rotor 21 and a stator 22, the rotor 21 is arranged on the motor shaft 23, and the motor shaft 23 includes a first half shaft 231 and a second half shaft 232 arranged coaxially; the reduction gear is arranged on the reduction gear housing 12 Inside, the speed reduction device includes a sun gear 31 arranged on the first half shaft 231, a first planetary gear 32 meshing with the sun gear 31, a second planetary gear 33 coaxial with the first planetary gear 32 and fixedly arranged, and The second planetary gear 33 meshes with a ring gear 34, the ring gear 34 is arranged on the reduction gear casing 12, the first planetary gear 32 and the second planetary gear 33 are rotatably arranged on the differential case 13; the differential gear 4 is arranged on the differential Inside the gear housing 13, the differential 4 is arranged between the first half shaft 231 and the second half shaft 232, and the differential gear 4 is at least partially located between the second planetary gear 33 and the first half shaft 231; One end of the shaft 231 away from the second half shaft 232 is provided with a disconnecting device 5, and the disconnecting device 5 can selectively connect or disconnect the first half shaft 231 and the wheel hub.

By arranging the deceleration device and the differential 4, the deceleration of the motor and the differential function between the two wheels are realized; The differential 4 is partially located between the second planetary wheel 33 and the first half shaft 231, which reduces the axis size of the coaxial electric drive system and facilitates the layout of the entire vehicle; Selective connection or disconnection between the shaft 23 and the hub, when the motor shaft 23 is connected with the hub, the motor can drive the hub, and when the motor shaft 23 is disconnected from the hub, the motor no longer drives the hub, and the motor shaft 23 corresponds to the hub. The hub is used as a driven wheel to realize the switching of the vehicle's four-wheel drive or hybrid; in addition, the setting of the sun gear 31, the first planetary gear 32, the second planetary gear 33 and the ring gear 34 can achieve two-stage deceleration, and the deceleration effect is better. The structure is more compact.

In one embodiment, in order to realize the fixed connection between the first planetary gear 32 and the second planetary gear 33, the first planetary gear 32 and the second planetary gear 33 can be welded or the first planetary gear 32 and the second planetary gear 33 can be welded together. One piece. In addition, in order to ensure the stability of the operation of the reduction gear, at least two first planetary gears 32 and second planetary gears 33 are respectively provided, and the first planetary gears 32 and the second planetary gears 33 are provided in a one-to-one correspondence.

In one embodiment, the reduction gear further includes a planetary gear shaft 35, the fixedly connected first planetary gear 32 and the second planetary gear 33 are rotatably arranged on the planetary gear shaft 35, the planetary gear shaft 35 is arranged on the differential case 13, In the embodiment, the planetary axle 35 is connected to the differential case 13 through the shaft pin 37 . The power passes through the motor shaft 23 through the sun gear 31 and the first planetary gear 32 to achieve a first-stage deceleration, and then through the second planetary gear 33 and the ring gear 34 to achieve a second-stage deceleration.

In order to ensure more stable rotation between at least one of the first planetary gear 32 and the second planetary gear 33 and the planetary gear shaft 35, at least one of the first planetary gear 32 and the second planetary gear 33 and the planetary gear shaft 35 are arranged between There are needle roller bearings 36, and the arrangement of the needle roller bearings 36 is also beneficial to reduce the radial dimension of the reduction gear; in order to adapt to the width of the first planetary gear 32 and the second planetary gear 33, double-row or triple-row bearings can also be provided. In one embodiment, the sun gear 31 is mounted on the first half shaft 231 by splines, and is fixed by a snap ring; the ring gear 34 is fixed on the reduction gear housing 12 by splines, and is fixed by the snap ring, and the splines are arranged to be able to transmit more torque.

In one embodiment, in order to reduce the axial gear of the coaxial electric drive system, the differential gear 4 is at least partially located between the second planetary gear 33 and the first half shaft 231, so as to realize the For support, a first bearing 41 is provided between the differential 4 and the first half shaft 231 , which is placed between the second planetary gear 33 and the first half shaft 231 .

In one embodiment, a second bearing 42 is provided between the first half shaft 231 and the motor casing 11 to realize the support between the first half shaft 231 and the motor casing 11; The support and rotation on the half shaft 231 are more reliable, and the sun gear 31 is arranged between the first bearing 41 and the second bearing 42 .

In this embodiment, the end of the second half shaft 232 away from the first half shaft 231 is also provided with the disconnecting device 5, and the second half shaft 232 and the disconnecting device 5 can be in the connecting position or the disconnecting position at the same time, which effectively avoids the need for Only when the disconnecting device 5 is provided at the end of the first half shaft 231, the second half shaft 232 drags the differential 4 in the reverse direction after disconnection, resulting in the problem of large drag torque, which is beneficial to reduce fuel consumption and reduce emissions .

As shown in FIG. 2 and FIG. 3 , the disconnecting device 5 includes a coupling 51 , a gear sleeve 52 and a gear hub 53 , the coupling 51 is connected with the wheel hub, the gear sleeve 52 is slidably connected with the coupling 51 , and the gear sleeve 52 is connected with The driving member 54 is connected, and the gear sleeve 52 can be driven by the driving member 54 to move along the axial direction of the motor shaft 23 ;

By arranging the coupling 51, the gear sleeve 52 and the gear hub 53 between the motor shaft 23 and the wheel hub, and driving the gear sleeve 52 through the driving member 54, the gear sleeve 52 is moved along the axial direction of the motor shaft 23, thereby driving the gear hub 53 is selectively connected with the motor shaft 23, when the gear hub 53 is connected with the motor shaft 23, the driving force of the rotor 21 of the motor can drive the motor shaft 23, the gear hub 53, the gear sleeve 52, the coupling 51 and the wheel hub to rotate in turn, The four-wheel drive and hybrid drive of the vehicle are realized. When the gear hub 53 is disconnected from the motor shaft 23, the vehicle is two-wheel drive. The disconnecting device 5 has a simple structure, a low space occupation rate, and a small drag when disconnected. Pulling torque can reduce fuel consumption and reduce emissions.

As shown in FIG. 2-FIG. 7, taking the first half shaft 231 as an example, in order to realize the connection between the gear hub 53 and the motor shaft 23, as shown in FIG. A meshing tooth 531, as shown in FIG. 4, the end of the first half shaft 231 close to the gear hub 53 is provided with a second meshing tooth 2311 meshing with the first meshing tooth 531; when the driving member 54 drives the gear sleeve 52 along the motor shaft 23 When the motor moves axially, the first meshing teeth 531 can mesh with the second meshing teeth 2311. At this time, the disconnecting device 5 is in the connecting position, and the rotor 21 of the motor can drive the motor shaft 23, the gear hub 53, the gear sleeve 52, and the coupling shaft. When the driving member 54 drives the gear sleeve 52 to move along the axial direction of the motor shaft 23 until the first meshing teeth 531 and the second meshing teeth 2311 are disengaged, the disconnecting device 5 is in the disconnecting position, and the tooth The hub 53, the gear sleeve 52, the coupling 51 and the wheel hub are rotated by the power provided by the engine.

In one embodiment, as shown in FIG. 6 , a limit groove 511 is provided at one end of the coupling 51 close to the gear hub 53 , and the limit groove 511 includes a deep groove 5111 and a shallow groove 5112 arranged alternately in sequence; as shown in FIG. 5 , one end of the gear hub 53 close to the coupling 51 is provided with a limit protrusion 532, and the limit protrusion 532 includes a high protrusion 5321 and a low protrusion 5322 arranged alternately in turn; when the gear sleeve 52 is driven, the high protrusion 5321 can be It is matched with the deep groove 5111 and the shallow groove 5112 in sequence; when the high protrusion 5321 is matched with the deep groove 5111, the first meshing tooth 531 meshes with the second meshing tooth 2311, the high protrusion 5321, the shallow groove 5112, the first meshing tooth 531 Together with the second meshing teeth 2311 to transmit the power of the motor rotor 21; when the high protrusions 5321 cooperate with the shallow grooves 5112, the first meshing teeth 531 and the second meshing teeth 2311 are disengaged, because the high protrusions 5321 cooperate with the shallow grooves 5112 , so only the gear hub 53 rotates with the hub along with the gear sleeve 52 and the coupling 51 .

In one embodiment, the outer peripheral wall of the coupling 51 is provided with a guide groove 512 , and the inner wall of the sleeve body 521 of the gear sleeve 52 is provided with guide teeth 522 that can slide in the guide groove 512 . When the drive member 54 drives the gear sleeve 52 to move, the guide teeth 522 slide in the guide groove 512 to provide a direction for the movement of the gear sleeve 52 so that the gear sleeve 52 only moves along the axial direction of the motor shaft 23 .

In this embodiment, one end of the guide tooth 522 close to the tooth hub 53 is provided with a first inclined surface 5221 , the outer peripheral wall of the tooth hub 53 is provided with a top post 533 , and one end of the top post 533 close to the gear sleeve 52 is provided with the first inclined surface 5221 The matching second slope 5331. The arrangement of the first inclined surface 5221 and the second inclined surface 5331 realizes one-time cooperation between the high protrusion 5321 and the deep groove 5111 and the shallow groove 5112 . Correspondingly, the surface of the guide teeth 522 opposite to the first inclined surface 5221 in the axial direction of the motor shaft 23 is the first contact surface 5222, and the surface of the top column 533 opposite to the second inclined surface 5331 in the axial direction of the motor shaft 23 is The second contact surface 5332 .

In one embodiment, the gear hub 53 is connected with an elastic member, and the elastic member can apply an elastic force toward the coupling 51 to the gear hub 53, so that the gear hub 53 can always be connected to the coupling when there is no driving of the gear sleeve 52. 51 butt.

The process of changing the disconnecting device 5 from the disconnecting position to the connecting position is as follows: the gear sleeve 52 is driven by the driving member 54 to move close to the motor shaft 23 along the axial direction of the motor shaft 23 , and the first inclined surface 5221 first abuts and cooperates with the second inclined surface 5331 , since the high protrusion 5321 is matched with the deep groove 5111 at this time, in the initial stage when the gear sleeve 52 drives the gear hub 53 to move, the gear hub 53 only moves in the circumferential direction of the motor shaft 23, so that the first meshing teeth 531 and the second The meshing teeth 2311 mesh; since the gear sleeve 52 drives the gear hub 53 in the axial direction of the motor shaft 23, the first inclined surface 5221 not only exerts a force along the axial direction of the motor shaft 23 on the second inclined surface 5331, but also applies a force to the second inclined surface 5331 in the axial direction of the motor shaft 23. A force is applied along the tangential direction of the outer peripheral wall of the toothed hub 53, so when the high protrusion 5321 is disengaged from the deep groove 5111, the toothed hub 53 will rotate by a preset angle until the first abutting surface 5222 and the second abutting surface 5332 abut At this time, the high protrusion 5321 is facing the shallow groove 5112; then the driving member 54 drives the gear sleeve 52 to move away from the motor shaft 23 along the axial direction of the motor shaft 23, because the gear hub 53 is connected with an elastic member, and the elastic member can The hub 53 exerts a force toward the coupling 51 in the axial direction of the motor shaft 23, so the gear hub 53 will also follow the gear sleeve 52 and move away from the motor shaft 23 in the axial direction of the motor shaft 23 until the high protrusion 5321 and the shallow groove 5112 abuts to realize the change of the disconnecting device 5 from the disconnecting position to the connecting position.

The rotation angle of the gear hub 53 is related to the number of the top posts 533 provided on the outer peripheral wall of the gear hub 53 and the guide teeth 522 provided on the inner wall of the sleeve body 521 of the gear sleeve 52 , which is not specifically limited here. In addition, when the disconnecting device 5 is in the connection position, although the first meshing tooth 531 is engaged with the second meshing tooth 2311, there is a gap between the tooth root of the first meshing tooth 531 and the tooth root of the second meshing tooth 2311, so as to facilitate the When the disconnection device 5 changes from the connection position to the disconnection position, the high protrusion 5321 and the shallow groove 5112 can be disconnected.

The process of changing the disconnecting device 5 from the connected position to the disconnected position is as follows: the gear sleeve 52 is driven by the driving member 54 to move close to the motor shaft 23 along the axial direction of the motor shaft 23, the first inclined surface 5221 and the second inclined surface 5331 abut and cooperate, Since the high protrusions 5321 are matched with the shallow grooves 5112 at this time, at the initial stage when the gear sleeve 52 drives the gear hub 53 to move, the gear hub 53 only moves in the circumferential direction of the motor shaft 23 to offset the root of the first meshing tooth 531 and the The gap between the tooth roots of the second meshing teeth 2311; since the gear sleeve 52 drives the gear hub 53 in the axial direction of the motor shaft 23, the first inclined surface 5221 not only exerts a force along the axial direction of the motor shaft 23 on the second inclined surface 5331 , the second inclined surface 5331 will also exert a force along the tangential direction of the outer peripheral wall of the gear hub 53, so when the high protrusion 5321 is disengaged from the shallow groove 5112, the gear hub 53 will rotate by a preset angle until the first abutting surface 5222 Abutting with the second abutting surface 5332, at this time the high protrusion 5321 is facing the deep groove 5111; then the driving member 54 drives the gear sleeve 52 to move away from the motor shaft 23 in the axial direction of the motor shaft 23, because the gear hub 53 is connected elastically The elastic member can apply a force to the gear hub 53 toward the coupling 51 in the axial direction of the motor shaft 23, so the gear hub 53 will also follow the gear sleeve 52 and move away from the motor shaft 23 in the axial direction of the motor shaft 23. A meshing tooth 531 is out of contact with the second meshing tooth 2311, and at the same time, the high protrusion 5321 is in contact with the deep groove 5111, so as to realize the change of the disconnecting device 5 from the connection position to the disconnection position.

In one embodiment, one side of the high protrusion 5321 is provided with a first guide surface 534, and one side of the shallow groove 5112 is provided with a second guide surface 513 that cooperates with the first guide surface 534, which is the high protrusion 5321. The engaging connection with the shallow groove 5112 provides a guiding effect, so that the engaging connection between the high protrusion 5321 and the shallow groove 5112 is more accurate.

In this embodiment, the coupling 51 is provided with splines inside, and the hub is connected with the splines. The splines can transmit large power and are not easy to fail, which is beneficial to improve the service life of the disconnecting device 5 .

In one embodiment, an annular groove 523 is provided on the outer wall of the sleeve body 521 of the toothed sleeve 52 , and the driving member 54 is connected with the annular groove 523 . The driving member 54 may be a shift fork or a cylinder, etc., as long as the driving gear sleeve 52 can move in the axial direction of the motor shaft 23 , which is not specifically limited here.

In one embodiment, the coaxial electric drive system further includes a first end cover 14 and a second end cover 15 , the first end cover 14 , the motor casing 11 , the reduction gear casing 12 , the differential case 13 and the second end cover 14 . The covers 15 are connected in sequence to cover the disconnect device 5 , the motor, the reduction gear and the differential 4 . Optionally, the first end cover 14 , the motor case 11 , the reduction gear case 12 , the differential case 13 and the second end cover 15 can be detachably connected to facilitate installation and maintenance.

In one embodiment, the motor casing 11 includes a front casing 111 and a rear casing 112 , the front casing 111 is connected to the first end cover 14 , the rear casing 112 is connected to the reduction gear casing 12 , and the driving member 54 is slidably disposed on the first end cover. within 14.

This embodiment also discloses a vehicle, which includes the above-mentioned coaxial electric drive system, has a compact structure, a small axial dimension, and is provided with a disconnecting device 5, which is more energy-saving and emission-reducing.

In the description of this application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation or a specific orientation. construction and operation, and therefore should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed to indicate or imply relative importance. Therein, the terms "first position" and "second position" are two different positions.

In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood in specific situations.

Claims

A coaxial electric drive system, comprising:

motor housing (11);

a reduction gear casing (12), connected with the motor casing (11);

a differential case (13), arranged in the reduction gear case (12);

A motor, placed in the motor housing (11), includes a rotor (21) and a stator (22) that rotate relative to each other, the rotor (21) is arranged on a motor shaft (23), and the motor shaft (23) comprising a first half shaft (231) and a second half shaft (232) arranged coaxially;

A reduction gear is provided in the reduction gear housing (12), the reduction gear comprises a sun gear (31) arranged on the first half shaft (231), a second gear meshed with the sun gear (31) a planetary gear (32), a second planetary gear (33) coaxially and fixedly arranged with the first planetary gear (32), and a ring gear (34) meshing with the second planetary gear (33), The ring gear (34) is arranged on the reduction gear casing (12), and the first planetary gear (32) and the second planetary gear (33) are rotatably arranged on the differential casing (13) superior;

A differential (4) is arranged in the differential housing (13), and the differential (4) is arranged between the first half shaft (231) and the second half shaft (232) the differential (4) is at least partially located between the second planetary gear (33) and the first axle shaft (231); and

A disconnecting device (5) is arranged at one end of the first half shaft (231) away from the second half shaft (232), and the disconnecting device (5) is configured to selectively connect or disconnect the first half shaft (231). Half shaft (231) and hub.
The coaxial electric drive system according to claim 1, wherein the speed reduction device further comprises a planetary gear shaft (35), and the first planetary gear (32) and the second planetary gear (33) are rotatably arranged on the On the planetary wheel shaft (35), the planetary wheel shaft (35) is arranged on the differential case (13).
The coaxial electric drive system according to claim 2, further comprising at least one of the first planetary gear (32) and the second planetary gear (33) and the planetary gear shaft (35) needle bearing (36).
The coaxial electric drive system according to claim 1, further comprising a first bearing (41) disposed between the differential (4) and the first half shaft (231).
The coaxial electric drive system according to claim 4, further comprising a second bearing (42) disposed between the first half shaft (231) and the motor housing (11), the sun gear (31) is provided between the first bearing (41) and the second bearing (42).
The coaxial electric drive system according to claim 1, wherein the number of the disconnecting devices (5) is two, and the other disconnecting device (5) is arranged on the second half shaft (232) one end away from the first half shaft (231).
The coaxial electric drive system according to claim 1, further comprising a driving member (54), the disconnecting device (5) comprising:

Coupling (51);

A gear sleeve (52) is slidably connected with the coupling (51), the gear sleeve (52) is connected with the driving member (54), and the driving member (54) is configured to drive the gear sleeve (54). 52) moving along the axial direction of the motor shaft (23);

A gear hub (53) is in contact with the coupling (51), and the gear sleeve (52) is configured to drive the gear hub (53) to selectively connect with the motor shaft (23).
The coaxial electric drive system according to claim 7, wherein the gear hub (53) is connected with an elastic member, and the elastic member is configured to apply a force toward the coupling (51) to the gear hub (53) ) direction of the elastic force.
The coaxial electric drive system according to any one of claims 1-8, further comprising a first end cover (14) and a second end cover (15), the first end cover (14), the motor The case (11), the reduction gear case (12), the differential case (13) and the second end cover (15) are connected in sequence.
A vehicle, comprising the coaxial electric drive system according to any one of claims 1-9.