Distributed electric drive system and vehicle

Abstract

The present application provides a distributed electric drive system and a vehicle. The distributed electric drive system comprises two transmission devices. Each transmission device comprises: a driving device, the driving device being provided with a first output shaft; a second output shaft, the second output shaft being arranged coaxially with the first output shaft and being configured for being in transmission connection with a wheel; and a speed reducer device, which comprises a first-gear transmission assembly, a second-gear transmission assembly and a coupling member, wherein an input end of the first-gear transmission assembly and an input end of the second-gear transmission assembly are both connected to the first output shaft, an output end of the first-gear transmission assembly and an output end of the second-gear transmission assembly are both in transmission connection with the second output shaft, the first-gear transmission assembly can be connected by means of the coupling member and is thus driven by the driving device to drive the second output shaft to rotate at a first speed, and the second-gear transmission assembly can be connected by means of the coupling member and is thus driven by the driving device to drive the second output shaft to rotate at a second speed. The distributed electric drive system implements dual-gear transmission and has a compact structure, and the radial size of the distributed electric drive system is reduced.

Description

Distributed electric drive system and vehicle

[0001] Cross-reference to Related Applications

[0002] The present application claims priority to the Chinese patent application No. 202410459026.6, filed on April 16, 2024, and entitled “Distributed electric drive system and vehicle”, the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present application relates to the technical field of vehicles, and particularly relates to a distributed electric drive system and vehicle. BACKGROUND

[0004] The existing distributed electric drive assembly mostly adopts a one-gear scheme, but such distributed electric drive assembly has low high-speed efficiency, in order to ensure the same endurance of the whole vehicle, the requirement for battery power is increased, thereby increasing the system cost. On the other hand, there is also a distributed electric drive assembly adopting a two-gear scheme, for example, a two-gear planetary reduction mechanism and a planetary differential are adopted, or a parallel shaft arrangement of a motor, a reduction driven wheel and a differential is adopted. The distributed electric drive assembly adopting the two-gear scheme often has the problem of complex structure, and increases the radial size of the vehicle, resulting in large envelope size, which brings difficulties to the arrangement of the whole vehicle. SUMMARY

[0005] In view of the above-mentioned deficiencies of the prior art, the purpose of the present application is to provide a distributed electric drive system and vehicle, which realizes two-gear reduction and has compact overall structure, and can effectively reduce the X-direction space occupied by the distributed electric drive system in the vehicle.

[0006] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0007] The technical scheme of the first aspect of the present application proposes a distributed electric drive system, which comprises two transmission devices, and the two transmission devices are respectively used to drive the wheels on both sides to rotate, and the transmission device comprises:

[0008] a driving device, the driving device being provided with a first output shaft;

[0009] a second output shaft, which is coaxially arranged with the first output shaft, and is used to be in transmission connection with the wheel;

[0010] The reduction gear device comprises a first transmission assembly, a second transmission assembly and a coupling member, the input ends of the first transmission assembly and the second transmission assembly are connected with the first output shaft, the output ends of the first transmission assembly and the second transmission assembly are connected with the second output shaft, the coupling member is connected with the first output shaft, the first transmission assembly can be coupled by the coupling member to drive the second output shaft to rotate at a first speed under the driving of the driving device, the second transmission assembly can be coupled by the coupling member to drive the second output shaft to rotate at a second speed under the driving of the driving device, wherein the first speed is different from the second speed.

[0011] The first aspect of the present application discloses a distributed electric drive system, wherein two wheels are respectively driven to rotate by corresponding driving devices, so that the wheels on both sides can be independently driven, the input ends of the first transmission assembly and the second transmission assembly in the reduction gear device are connected with the first output shaft, and the output ends are respectively connected with the second output shaft, since the coupling member is connected with the first output shaft, the power of the first output shaft can be transmitted to the second output shaft at different speeds by controlling the coupling member to select one of the first transmission assembly and the second transmission assembly, which can increase the power performance and economy of the vehicle using the distributed electric drive system, and reduce the maximum torque and the highest speed demand of the two driving devices, thereby reducing the cost of the motor, improving the high-speed efficiency, reducing the high-speed noise and improving the reliability; at the same time, the first output shaft of the driving device and the second output shaft for driving the wheel are coaxially arranged in the distributed electric drive system, which can effectively reduce the radial size of the distributed electric drive system and reduce the space occupation of the assembly in the X direction of the vehicle.

[0012] In some embodiments of the present application, the transmission device further comprises a transmission shaft and a transmission gear mechanism, the output ends of the first transmission assembly and the second transmission assembly are connected with the transmission shaft, and the transmission shaft is connected with the second output shaft through the transmission gear mechanism. The transmission shaft and the second output shaft are arranged in parallel, and the second output shaft connected with the output end of the transmission gear mechanism is coaxially arranged with the first output shaft, which not only optimizes the structural layout of the distributed electric drive system, but also reduces the complexity of the distributed electric drive system and improves the reliability of the system.

[0013] In some embodiments of the present application, the transmission gear mechanism comprises a first transmission gear and a second transmission gear, the first transmission gear is engaged with the second transmission gear, the first transmission gear is connected with the transmission shaft, and the second transmission gear is connected with the second output shaft. In this way, the first transmission assembly or the second transmission assembly is transmitted to the first transmission gear through the transmission shaft, the engagement of the first transmission gear and the second transmission gear enables the power to be transmitted to the second transmission gear, and then drives the second output shaft to rotate, realizing the smooth transmission of power and the transformation of speed.

[0014] In some embodiments of the present application, the engaging member is connected to the first output shaft.

[0015] In some embodiments of the present application, the engaging member is connected to the transmission shaft.

[0016] In some embodiments of the present application, the first gear mechanism includes a first input gear and a first output gear, the first input gear and the first output gear are engaged, the first input gear is connected to the first output shaft and can rotate relative to the first output shaft, and the first output gear is connected to the transmission shaft.

[0017] The second gear mechanism includes a second input gear and a second output gear, the second input gear and the second output gear are engaged, the second input gear is connected to the first output shaft and can rotate relative to the first output shaft, and the second output gear is connected to the transmission shaft.

[0018] In some embodiments of the present application, the first gear mechanism includes a first input gear and a first output gear, the first input gear and the first output gear are engaged, the first input gear is connected to the first output shaft and can rotate relative to the first output shaft, and the first output gear is connected to the transmission shaft.

[0019] The second gear mechanism includes a second input gear and a second output gear, the second input gear and the second output gear are engaged, the second input gear is connected to the first output shaft and can rotate relative to the first output shaft, and the second output gear is connected to the transmission shaft.

[0020] In some embodiments of the present application, a first bearing is further included, the first input gear and the first output shaft are connected through the first bearing to enable the first input gear to rotate relative to the first output shaft. By providing the first bearing between the first input gear and the first output shaft, the first input gear can freely rotate on the first output shaft without causing mutual interference or friction between the first gear mechanism and the second gear mechanism.

[0021] In some embodiments of the present application, a second bearing is further included, the second input gear and the first output shaft are connected through the second bearing to enable the second input gear to rotate relative to the first output shaft. By providing the first bearing between the second input gear and the first output shaft, the second input gear can freely rotate on the first output shaft without causing mutual interference or friction between the first gear mechanism and the second gear mechanism.

[0022] In some embodiments of the present application, an electric control device is further included, and the driving device includes driving motors, and the electric control device is electrically connected to the driving motors of the two transmission devices. By electrically connecting the driving motors of the two transmission devices to the electric control device, the electric control device can accurately control and manage the operation of the two driving motors.

[0023] In some embodiments of the present application, the driving motors of the two transmission devices are coaxially arranged, the transmission shaft is arranged in parallel with the first output shaft, the electric control device is arranged corresponding to the driving motors, and the electric control device is located between the output end of the first gear transmission assembly and the output end of the second gear transmission assembly. In this way, the overall size of the distributed electric drive system can be effectively reduced.

[0024] In some embodiments of the present application, the engagement member is one of a synchronizer, a brake, or a clutch.

[0025] The second aspect of the technical solution of the present application proposes a vehicle, including a vehicle body, wheels, and an electric drive system, the wheels are installed on the vehicle body, and the electric drive system includes a distributed electric drive system according to any one of the above. The distributed electric drive system is used to drive two wheels to move. By using the above-mentioned distributed electric drive system, each wheel can be independently driven by a transmission device, so that the vehicle can accurately distribute and control power according to different road conditions and driving requirements. Moreover, the distributed electric drive system disclosed in the present application is provided with a first gear transmission assembly and a second gear transmission assembly, and under the action of the engagement member engaging the first gear transmission assembly or the second gear transmission assembly, the wheels on both sides rotate at corresponding speeds, so that the vehicle can be flexibly adjusted under different driving conditions and driving requirements. Moreover, since the first output shaft of the driving device of the distributed electric drive system is coaxially arranged with the second output shaft for driving the wheels to rotate, the structural layout of the distributed electric drive system is optimized, the X-direction space occupied by the distributed electric drive system is effectively reduced, and the space utilization of the vehicle is improved. BRIEF DESCRIPTION OF DRAWINGS

[0026] FIG. 1 is a schematic view of a distributed electric drive system according to some embodiments of the present application.

[0027] Among them, the correspondence between the reference signs and the component names is:

[0028] 1 driving device;

[0029] 2 first output shaft;

[0030] 3 second output shaft;

[0031] 4 reduction device, 41 first gear transmission assembly, 411 first input gear, 412 first output gear, 42 second gear transmission assembly, 421 second input gear, 422 second output gear, 43 engagement member;

[0032] 5 transmission shaft;

[0033] 6 transmission gear mechanism, 61 first transmission gear, 62 second transmission gear;

[0034] 71 first bearing, 72 second bearing;

[0035] 8 electric control device. DETAILED DESCRIPTION

[0036] The application provides a distributed electric drive system and a vehicle. In order to make the purpose, technical scheme and effect of the application more clear and explicit, the application is further described in detail below with reference to the drawings and examples. It should be understood that the specific examples described herein are only used to explain the application and do not limit the protection scope of the application.

[0037] In the description of the application, it should be understood that the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application.

[0038] In the description of the application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection or can communicate with each other; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0039] With the gradual development of new energy vehicles as one of the mainstream development directions of the automobile industry, distributed electric drive assemblies are more and more applied in the field of new energy vehicles. Distributed electric drive can independently drive left and right wheels, so that the speed and torque of the wheels can be independently controlled, which can greatly improve the controllability and safety of the wheels, and also can reduce the turning radius of the wheels.

[0040] However, most of the current distributed electric drive assemblies adopt a one-gear scheme, which requires high speed of the motor at high vehicle speed, thereby bringing the disadvantages of low high-speed efficiency, high-frequency screeching noise of the motor, and decreased reliability of the shaft tooth life; at low vehicle speed, in order to ensure the power performance of the vehicle, the demand for peak torque of the motor is large; due to the low high-speed efficiency, in order to ensure the same endurance of the vehicle, the demand for battery power is increased, thereby increasing the system cost.

[0041] On the other hand, a coaxial two-gear scheme is also used, which overcomes the shortcomings of the one-gear scheme, but mainly uses a two-gear planetary reduction mechanism and a planetary differential, making the structure complex, and using clutches, brakes and planetary differentials for gear shifting control and differential control, making control difficult, and the left and right wheels cannot be completely independently controlled; some use a motor, a reduction driven wheel and a differential parallel shaft arrangement, which increases the radial size of the vehicle, resulting in a large envelope size, making it difficult to arrange the whole vehicle.

[0042] Please refer to Figure 1, an embodiment of one aspect of the present application proposes a distributed electric drive system, which includes two transmission devices, and the two transmission devices are respectively used to drive the wheels on both sides to rotate, so that the wheels on both sides can be independently driven, which can improve the controllability and safety performance. Among them, the transmission device includes a driving device 1, a second output shaft 3 and a reduction device 4, and the reduction device 4 includes a one-gear transmission assembly 41, a two-gear transmission assembly 42 and an engagement piece 43.

[0043] The driving device 1 is provided with a first output shaft 2, and the second output shaft 3 is coaxially arranged with the first output shaft 2, and the second output shaft 3 is used to be in transmission connection with the wheels. The power generated by the operation of the driving device 1 makes the first output shaft 2 rotate, for example, the driving device 1 can use a driving motor, and the rotor of the driving motor is connected with the first output shaft 2, so as to drive the first output shaft 2 to rotate.

[0044] The reduction device 4 includes a one-gear transmission assembly 41, a two-gear transmission assembly 42 and an engagement piece 43, the input ends of the one-gear transmission assembly 41 and the two-gear transmission assembly 42 are respectively connected with the first output shaft 2, the output ends of the one-gear transmission assembly 41 and the two-gear transmission assembly 42 are respectively in transmission connection with the second output shaft 3, and the engagement piece 43 is in transmission connection with the first output shaft 2. The one-gear transmission assembly 41 can be combined with the engagement piece 43 to drive the second output shaft 3 to rotate at a first speed under the drive of the driving device 1, and the two-gear transmission assembly 42 can be combined with the engagement piece 43 to drive the second output shaft 3 to rotate at a second speed under the drive of the driving device 1, wherein the first speed and the second speed are different.

[0045] Specifically, the deceleration device 4 plays a role of deceleration in the transmission process of the distributed electric drive system. The input ends of the first transmission assembly 41 and the second transmission assembly 42 are connected with the first output shaft 2, and the output ends are respectively in transmission connection with the second output shaft 3. Since the engaging member 43 is in transmission connection with the first output shaft 2, the power of the first output shaft 2 can be transmitted to the second output shaft 3 at a speed selected by controlling the engaging member 43 to engage one of the first transmission assembly 41 and the second transmission assembly 42. When the first transmission assembly 41 is engaged by the engaging member 43, the second output shaft 3 can be driven to rotate at a first speed under the drive of the drive device 1. When the second transmission assembly 42 is engaged by the engaging member 43, the second output shaft 3 rotates at a second speed. The first speed and the second speed are different, so that the wheels on both sides rotate at corresponding speeds. The system can be flexibly adjusted according to the driving conditions and driving requirements.

[0046] It can be understood that when the engaging member 43 does not engage the first transmission assembly 41 and the second transmission assembly 42, the engaging member 43 is in the N gear state. Thus, when the distributed electric drive system is used as an auxiliary drive, the no-load loss can be effectively reduced by controlling the engaging member 43 in the N gear state.

[0047] The distributed electric drive system can select different transmission ratios as needed to adjust the rotational speed of the second output shaft 3. For example, the first transmission assembly 41 is configured as a large speed ratio, and the second transmission assembly 42 is configured as a small speed ratio. Thus, when the distributed electric drive system is applied to a vehicle, the large speed ratio of the first transmission assembly 41 can reduce the peak power and maximum torque of the motor, and the small speed ratio of the second transmission assembly 42 can reduce the maximum rotational speed of the motor, while keeping the overall performance of the vehicle (such as driving speed, braking performance, handling stability, etc.) unchanged. In the case where the motor (such as the type, power, torque, etc. of the motor) remains unchanged, the large speed ratio of the first transmission assembly 41 can improve the acceleration and climbing performance, and the small speed ratio of the second transmission assembly 42 can improve the maximum speed. Therefore, the system can be flexibly adjusted according to the driving conditions and driving requirements.

[0048] From the spatial distribution of the distributed electric drive system, the first output shaft 2 and the second output shaft 3 are coaxially arranged, which reduces the size of the distributed electric drive system in the direction perpendicular to the axis, avoids the envelope size of the distributed electric drive system being too large, provides more flexibility and optimization space for vehicle design, is conducive to improving the space utilization rate of the vehicle, reducing the manufacturing cost, and may help to improve the performance and driving experience of the vehicle.

[0049] In some embodiments, the transmission further comprises a transmission shaft 5 and a transmission gear mechanism 6, the output end of the first gear assembly 41 and the output end of the second gear assembly 42 are connected with the transmission shaft 5 respectively, and the transmission shaft 5 is connected with the second output shaft 3 through the transmission gear mechanism 6. In this way, the transmission shaft 5 can transmit the power of the first gear assembly 41 and the second gear assembly 42 to the transmission gear mechanism 6, and then transmit the power to the second output shaft 3 through the transmission gear mechanism 6, so that the second output shaft 3 can drive the wheels connected to one side to rotate. The transmission gear mechanism 6 can effectively transmit the power of the first gear assembly 41 and the second gear assembly 42 to the second output shaft 3, ensuring stable transmission and efficient use of power. Moreover, the transmission shaft 5 and the second output shaft 3 are arranged in parallel, and the second output shaft 3 connected with the output end of the transmission gear mechanism 6 is coaxially arranged with the first output shaft 2 through the arrangement of the transmission gear mechanism 6. In this way, the structure layout of the distributed electric drive system can be optimized, the complexity of the distributed electric drive system is reduced, and the reliability of the system is improved.

[0050] Specifically, the transmission gear mechanism 6 comprises a first transmission gear 61 and a second transmission gear 62, the first transmission gear 61 is engaged with the second transmission gear 62, the first transmission gear 61 is connected with the transmission shaft 5, and the second transmission gear 62 is connected with the second output shaft 3. The first gear assembly 41 or the second gear assembly 42 transmits power to the first transmission gear 61 through the transmission shaft 5, and the engagement of the first transmission gear 61 and the second transmission gear 62 enables the power to be transmitted to the second transmission gear 62, thereby driving the second output shaft 3 to rotate, achieving stable transmission of power and conversion of rotational speed.

[0051] In some embodiments of the present application, the engagement member 43 can be connected with the first output shaft 2, or the engagement member 43 is connected with the transmission shaft 5.

[0052] When the engagement member 43 is connected with the first output shaft 2, the engagement member 43 can be selectively combined with the input end of the first gear assembly 41 or the input end of the second gear assembly 42, thereby controlling the access and disconnection of the first gear assembly 41 and the second gear assembly 42.

[0053] When the engagement member 43 is connected with the transmission shaft 5, the engagement member 43 can be selectively combined with the output end of the first gear assembly 41 or the output end of the second gear assembly 42, thereby controlling the access and disconnection of the first gear assembly 41 and the second gear assembly 42.

[0054] In some embodiments, the first gear assembly 41 comprises a first gear mechanism, the input end of the first gear mechanism is connected with the first output shaft 2, the output end of the first gear mechanism is connected with the transmission shaft 5, and the input end of the first gear mechanism can be engaged by the engagement member 43 to drive the transmission shaft 5 to rotate at a first speed;

[0055] The second gear mechanism includes an input end connected with the first output shaft 2 and an output end connected with the transmission shaft 5, and the input end of the second gear mechanism can be engaged by the engaging member 43 to drive the transmission shaft 5 to rotate at a second speed.

[0056] The first gear mechanism and the second gear mechanism are connected with the first output shaft 2 and the transmission shaft 5 respectively, and the engaging member 43 is used to engage the first gear mechanism with the first output shaft 2 to drive the transmission shaft 5 to rotate at different speeds.

[0057] Specifically, the first gear mechanism in the first gear assembly 41 has an input end and an output end, and the input end is connected with the first output shaft 2. When the engaging member 43 engages the first gear mechanism with the first output shaft 2, power is transmitted from the first output shaft 2 to the input end of the first gear mechanism, and then transmitted to the output end of the first gear mechanism through the internal gear transmission of the first gear mechanism, thereby driving the transmission shaft 5 to rotate at a first speed.

[0058] Similarly, the second gear mechanism in the second gear assembly 42 also has an input end and an output end, and the input end is also connected with the first output shaft 2. When it is needed to switch to the second gear transmission, the engaging member 43 engages the second gear mechanism with the first output shaft 2, and power is transmitted to the input end of the second gear mechanism, and then transmitted to the output end through the internal gear transmission of the second gear mechanism, thereby driving the transmission shaft 5 to rotate at a second speed.

[0059] In more detail, the first gear mechanism includes a first input gear 411 and a first output gear 412, the first input gear 411 and the first output gear 412 are engaged with each other, the first input gear 411 is connected with the first output shaft 2 and can rotate relative to the first output shaft 2, and the first output gear 412 is connected with the transmission shaft 5.

[0060] The second gear mechanism includes a second input gear 421 and a second output gear 422, the second input gear 421 and the second output gear 422 are engaged with each other, the second input gear 421 is connected with the first output shaft 2 and can rotate relative to the first output shaft 2, and the second output gear 422 is connected with the transmission shaft 5, wherein the engaging member 43 is used to select one of the first input gear 411 and the second input gear 421 as the connection object.

[0061] In this way, the first input gear 411 and the second input gear 421 are coaxially arranged on the first output shaft 2, and the first output gear 412 and the second output gear 422 are coaxially arranged on the transmission shaft 5. When the engagement member 43 selects to engage the first input gear 411 with the first output shaft 2, the power of the first output shaft 2 is transmitted to the transmission shaft 5 through the engagement of the first input gear 411 and the first output gear 412, and then transmitted to the second output shaft 3 through the transmission gear mechanism 6, so that the wheels connected with the second output shaft 3 rotate.

[0062] Similarly, when the engagement member 43 selects to engage the second input gear 421 with the first output shaft 2, the power of the first output shaft 2 is transmitted to the transmission shaft 5 through the engagement of the second input gear 421 and the second output gear 422, and then transmitted to the second output shaft 3 through the transmission gear mechanism 6, so that the wheels connected with the second output shaft 3 rotate. By setting different transmission ratios of the first gear mechanism and the second gear mechanism, the wheels rotate at different speeds under the engagement of the engagement member 43, different transmission ratios and speed outputs are achieved, and the operation flexibility of the distributed electric drive system is improved.

[0063] Further, the first gear assembly 41 further comprises a first bearing 71, and the first input gear 411 and the first output shaft 2 are connected through the first bearing 71, so that the first input gear 411 can rotate relative to the first output shaft 2; the second gear assembly 42 further comprises a second bearing 72, and the second input gear 421 and the first output shaft 2 are connected through the second bearing 72, so that the second input gear 421 can rotate relative to the first output shaft 2. By arranging the first bearing 71 between the first input gear 411 and the first output shaft 2 and the second bearing 71 between the second input gear 421 and the first output shaft 2, the first input gear 411 and the second input gear 421 can freely rotate on the first output shaft 2 without interfering with each other or generating friction.

[0064] Specifically, when the first engagement member 43 selects to engage the first input gear 411 with the first output shaft 2, the first output shaft 2 can transmit power to the second output shaft 3 through the first gear assembly 41, and make the second output shaft 3 rotate at a first speed. At this time, the second input gear 421 is not engaged, so it can rotate relative to the first output shaft 2, so as not to interfere with the transmission process of the first gear assembly 41. On the other hand, the use of bearings can effectively reduce the friction and energy loss between the gears and the input shaft, so that the power transmission process is smoother and more efficient. At the same time, the bearing can bear a certain load and impact force, reducing system damage or failure caused by vibration and impact.

[0065] In some embodiments, the distributed electric drive system further comprises an electric control device 8, the drive device 1 comprises drive motors, and the electric control device 8 is electrically connected with the drive motors of the two transmission devices. By electrically connecting the drive motors of the two transmission devices with the electric control device 8, the electric control device 8 can accurately control and manage the operation of the two drive motors.

[0066] Specifically, the electric control device 8 can receive various signals and information from the vehicle, including vehicle speed, acceleration, steering angle, etc., and then adjust the operating state of the drive motor in real time according to these information. Under the control of the electric control device 8, the drive motor can accurately adjust the speed and torque according to the actual needs of the vehicle, so as to realize more efficient and stable driving. For example, the electric control device 8 can control the engagement piece 43 to selectively engage the first or second transmission assembly 41 or 42 with the first output shaft 2, realizing accurate control and management of the vehicle power system and improving the performance and safety of the vehicle.

[0067] Further, the drive motors of the two transmission devices are coaxially arranged, the transmission shaft 5 is arranged in parallel with the first output shaft 2, and the electric control device 8 is arranged corresponding to the drive motors in front and back, and the electric control device 8 is located between the output end of the first transmission assembly 41 and the output end of the second transmission assembly 42.

[0068] Among them, the drive motors of the two transmission devices are coaxially arranged, which is conducive to reducing the radial size of the distributed electric drive system, the transmission shaft 5 is arranged in parallel with the first output shaft 2, and the output end of the first transmission assembly 41 and the output end of the second transmission assembly 42 are respectively in transmission connection with the first output shaft 2. Please refer to FIG. 1, in the radial direction of the distributed electric drive system, the output end of the first transmission assembly 41 and the output end of the second transmission assembly 42, and the drive motors of the two transmission devices collectively enclose a containing space, so that the electric control device 8 can be accommodated in the containing space. In terms of space arrangement, the electric control device 8 can be arranged corresponding to the drive motors in front and back, so that the electric control device 8 can be directly electrically connected with the electric control device 8, which helps the electric control device 8 to quickly and accurately receive and send signals, realizes accurate control of the drive motor, and can effectively reduce the overall size of the distributed electric drive system.

[0069] Of course, the electric control device 8 and the drive motor can also be arranged in a top-down corresponding manner, and the electric control device 8 can be installed at the top position of the drive motor.

[0070] In some embodiments, the engagement piece 43 adopts one of a synchronizer, a brake, or a clutch.

[0071] In some embodiments of the present application, the synchronizer is selected as the engagement member 43, which can realize smooth transition and synchronous rotation between different gears, avoid impact and noise between gears, and improve the smoothness and comfort of gear shifting.

[0072] Embodiments of the second aspect of the present application disclose a vehicle, comprising a vehicle body, vehicle wheels and an electric drive system, the vehicle wheels are arranged on the vehicle body, and the electric drive system comprises the distributed electric drive system according to any one of the above embodiments, and the distributed electric drive system is used to drive the two vehicle wheels to move. By adopting the distributed electric drive system, each vehicle wheel can be independently driven by the transmission device, so that the vehicle can accurately allocate and control power according to different road conditions and driving requirements. In addition, the distributed electric drive system disclosed in the present application is provided with a first gear transmission assembly 41 and a second gear transmission assembly 42, and under the action of the engagement member 43 engaging the first gear transmission assembly 41 or the second gear transmission assembly 42, the two vehicle wheels rotate at corresponding speeds, so that the vehicle can be flexibly adjusted under different driving conditions and driving requirements. Moreover, since the first output shaft 2 of the driving device 1 of the distributed electric drive system is coaxially arranged with the second output shaft 3 for driving the vehicle wheels to rotate, the structural layout of the distributed electric drive system is optimized, the X-direction space occupied by the distributed electric drive system is effectively reduced, and the space utilization of the vehicle is improved.

[0073] It can be understood that, for those skilled in the art, equivalent replacements or changes can be made according to the technical solutions and inventive concepts of the present application, and all these changes or replacements shall fall within the protection scope of the present application.

Claims

1. A distributed electric drive system, characterized by, The transmission device comprises two driving devices, each of which is used to drive the wheels on two sides to rotate, and each of the driving devices comprises: a driving device provided with a first output shaft; a second output shaft coaxial with the first output shaft, which is used to be in driving connection with the wheels; a reduction device comprising a first gear assembly, a second gear assembly and an engaging member, the input ends of the first and second gear assemblies are connected with the first output shaft respectively, the output ends of the first and second gear assemblies are in driving connection with the second output shaft respectively, the engaging member is in driving connection with the first output shaft, the first gear assembly can be engaged by the engaging member to drive the second output shaft to rotate at a first speed under the drive of the driving device, the second gear assembly can be engaged by the engaging member to drive the second output shaft to rotate at a second speed under the drive of the driving device, wherein the first speed is different from the second speed.

2. The distributed electric drive system of claim 1, wherein, Further comprising: a transmission shaft and a transmission gear mechanism, the output ends of the first and second gear assemblies are connected with the transmission shaft respectively, the transmission shaft is in driving connection with the second output shaft through the transmission gear mechanism.

3. The distributed electric drive system according to claim 2, wherein the transmission gear mechanism comprises a first transmission gear and a second transmission gear, the first transmission gear is in engagement with the second transmission gear, the first transmission gear is connected with the transmission shaft, and the second transmission gear is connected with the second output shaft.

4. The distributed electric drive system according to claim 2 or 3, wherein the engaging member is connected with the first output shaft; or the engaging member is connected with the transmission shaft.

5. The distributed electric drive system according to claim 2 or 3, wherein the first gear assembly comprises a first gear mechanism, the input end of the first gear mechanism is connected with the first output shaft, the output end of the first gear mechanism is connected with the transmission shaft, and the input end of the first gear mechanism can be engaged by the engaging member to drive the transmission shaft to rotate at a first speed; the second gear assembly comprises a second gear mechanism, the input end of the second gear mechanism is connected with the first output shaft, the output end of the second gear mechanism is connected with the transmission shaft, and the input end of the second gear mechanism can be engaged by the engaging member to drive the transmission shaft to rotate at a second speed.

6. The distributed electric drive system according to claim 5, wherein the first gear mechanism comprises a first input gear and a first output gear, the first input gear and the first output gear are in engagement, the first input gear is connected with the first output shaft and can rotate relative to the first output shaft, and the first output gear is connected with the transmission shaft. The second gear mechanism comprises a second input gear and a second output gear, the second input gear and the second output gear are engaged, the second input gear is connected with the first output shaft and can rotate relative to the first output shaft, the second output gear is connected with the transmission shaft, wherein the engagement member is used to select one of the first input gear and the second input gear as the connection object.

7. The distributed electric drive system of claim 6, wherein, Further comprising: A first bearing, the first input gear and the first output shaft are connected through the first bearing, so that the first input gear can rotate relative to the first output shaft; A second bearing, the second input gear and the first output shaft are connected through the second bearing, so that the second input gear can rotate relative to the first output shaft.

8. The distributed electric drive system of claim 2 or 3, wherein, Further comprising: An electric control device, the drive device comprises a drive motor, and the electric control device is electrically connected with the drive motors of the two transmission devices.

9. The distributed electric drive system according to claim 8, wherein, The drive motors of the two transmission devices are coaxially arranged, the transmission shaft is arranged in parallel with the first output shaft, the electric control device is correspondingly arranged with the drive motors, and the electric control device is located between the output end of the first gear transmission assembly and the output end of the second gear transmission assembly.

10. The distributed electric drive system according to claim 2 or 3, wherein, The engagement member adopts one of a synchronizer, a brake or a clutch.

11. A vehicle characterized by comprising: A vehicle body, wheels and an electric drive system, the wheels are installed on the vehicle body, the electric drive system comprises the distributed electric drive system according to any one of claims 1 to 10, and the distributed electric drive system is used to drive the two wheels to move.

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