A power drive system and vehicle

Abstract

The application relates to the technical field of vehicle power, in particular to a power driving system and a vehicle. The power driving system comprises a first driving mechanism and a second driving mechanism; the first driving mechanism comprises a first sub-driving mechanism and a second sub-driving mechanism; the first sub-driving mechanism comprises an engine, a first motor, a first speed reduction mechanism, a first engagement and disengagement device and a second engagement and disengagement device; the first engagement and disengagement device is connected between an output shaft of the first motor and an output shaft of the engine, and is used for selectively engaging or disconnecting the connection between the output shaft of the first motor and the output shaft of the engine; the second engagement and disengagement device is connected between the output shaft of the first motor and an input end of the first speed reduction mechanism, and is used for selectively engaging or disconnecting the connection between the output shaft of the first motor and the input end of the first speed reduction mechanism; an output end of the first speed reduction mechanism is adapted to be connected to a first wheel on one side, and the second sub-driving mechanism is adapted to drive a first wheel on the other side.

Description

Technical Field

[0001] This application relates to the field of vehicle power technology, and in particular to a power drive system and a vehicle. Background Technology

[0002] Distributed electric drive is a hot topic in power drive system research, which consists of two or more drive motors that independently drive their respective wheels.

[0003] In existing technologies, range-extended drive systems developed based on distributed electric drive require three motors for the front drive: one motor for generating electricity and the other two motors for driving the left and right wheels, which is costly. Summary of the Invention

[0004] This application provides a power drive system and vehicle, which aims to improve the high cost of range-extended drive systems developed based on distributed electric drive.

[0005] To address the aforementioned issues, this application provides a power drive system, including a first drive mechanism and a second drive mechanism. The first drive mechanism drives a first wheel, and the second drive mechanism drives a second wheel. The first wheel and the second wheel are, respectively, a front axle wheel and a rear axle wheel. The first drive mechanism includes a first sub-drive mechanism and a second sub-drive mechanism. The first sub-drive mechanism includes an engine, a first motor, a first reduction mechanism, a first engagement / disengagement device, and a second engagement / disengagement device. The first engagement / disengagement device is connected between the output shaft of the first motor and the output shaft of the engine, and is used to selectively engage or disengage the connection between the output shaft of the first motor and the output shaft of the engine; The second engagement / disengagement device is connected between the output shaft of the first motor and the input end of the first reduction mechanism, and is used to selectively engage or disengage the connection between the output shaft of the first motor and the input end of the first reduction mechanism; The output end of the first deceleration mechanism is adapted to connect to the first wheel on one side, and the second sub-drive mechanism is adapted to drive the first wheel on the other side.

[0006] Furthermore, the second sub-drive mechanism includes a second motor and a second reduction mechanism, the output shaft of the second motor is connected to the input end of the second reduction mechanism, and the output end of the second reduction mechanism is adapted to connect to the first wheel on the other side.

[0007] Furthermore, the first motor and the second motor are integrated into the same housing; The output shaft of the first motor is parallel to or coaxial with the output shaft of the second motor.

[0008] Furthermore, the second drive mechanism includes a third motor, a third reduction mechanism, a fourth reduction mechanism, and a fourth motor. The output shaft of the third motor is connected to the input end of the third reduction mechanism, and the output end of the third reduction mechanism is adapted to connect to one side of the second wheel. The output shaft of the fourth motor is connected to the input end of the fourth reduction mechanism, and the output end of the fourth reduction mechanism is adapted to connect to the other side of the second wheel.

[0009] Furthermore, the third and fourth motors are integrated into the same housing; The output shaft of the third motor is parallel to or coaxial with the output shaft of the fourth motor.

[0010] Furthermore, the power drive system has a range-extended drive mode and a pure electric distributed drive mode; In the range-extended drive mode, the first engagement / disengagement device is engaged, the second engagement / disengagement device is disengaged, the engine drives the first motor to generate electricity, the second motor is not working, and the third motor and the fourth motor drive the engine. In the pure electric distributed drive mode, the first engagement disconnection device is disconnected, the second engagement disconnection device is engaged, the engine is not working, and the first motor, second motor, third motor and fourth motor are driven to enter the pure electric distributed drive mode.

[0011] Furthermore, the second drive mechanism includes a fifth motor, a fifth reduction mechanism, and a sixth reduction mechanism. The fifth motor has dual-end outputs. One output end of the fifth motor is connected to the input end of the fifth reduction mechanism, and the output end of the fifth reduction mechanism is adapted to connect to one side of the second wheel. The other output end of the fifth motor is connected to the input end of the sixth reduction mechanism, and the output end of the sixth reduction mechanism is adapted to connect to the other side of the second wheel.

[0012] Furthermore, the first engagement / disengagement device is a clutch or a synchronizer; and / or, The second engagement / disengagement device is a clutch or a synchronizer.

[0013] On the other hand, this application also provides a vehicle including the aforementioned power drive system.

[0014] Furthermore, it also includes a battery pack that can supply power to the first motor, the second sub-drive mechanism and the second drive mechanism, and can charge the battery pack when the engine drives the first motor to generate electricity.

[0015] In the power drive system of this application, by controlling the working states of the engine, the first motor, and the second sub-drive mechanism, and selectively engaging or disengaging the first engagement / disengagement device and the second engagement / disengagement device, both pure electric distributed drive and range-extended drive functions can be achieved. The pure electric distributed architecture and the range-extended architecture share the first motor, meaning that based on the traditional distributed electric drive configuration, only the first and second engagement / disengagement devices need to be added to achieve both functions, eliminating the need for additional motors as in existing technologies and reducing costs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the configuration of a power drive system provided in one embodiment of this application; Figure 2 yes Figure 1 The schematic diagram of the power drive system in range-extended drive mode; Figure 3 yes Figure 1 The schematic diagram of the power drive system in pure electric distributed drive mode.

[0017] The reference numerals in the accompanying drawings are as follows: 100, First sub-drive mechanism; 200, Second sub-drive mechanism; 300, Second drive mechanism; 400, Front controller; 500, Rear controller; 600, Battery pack; 1. Engine; 2. First engagement / disengagement device; 3. First motor; 4. First reduction gear; 5. Second engagement / disengagement device; 6. Second motor; 7. Second reduction gear; 8. Third motor; 9. Third reduction gear; 10. Fourth motor; 11. Fourth reduction gear. Detailed Implementation

[0018] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0019] In existing technologies, range-extended drive systems developed based on distributed electric drive require three motors for the front drive: one for generating electricity and the other two for driving the left and right wheels. For example, some existing vehicle models use a range-extended power layout consisting of a range extender (containing one motor) and four motors (front and rear), totaling five motors to achieve range-extended and distributed electric drive. The front drive requires three motors (one of which is the range extender motor), resulting in higher costs and the need to develop the range extender separately.

[0020] To address the aforementioned problems, this application provides a power drive system, as shown in the attached diagram. Figure 1 It includes a first drive mechanism and a second drive mechanism 300, the first drive mechanism is used to drive a first wheel, and the second drive mechanism 300 is used to drive a second wheel; the first wheel and the second wheel, one of which is a front axle wheel and the other is a rear axle wheel.

[0021] The first drive mechanism includes a first sub-drive mechanism 100 and a second sub-drive mechanism 200. The first sub-drive mechanism 100 includes an engine 1, a first motor 3, a first reduction mechanism 4, a first engagement / disengagement device 2, and a second engagement / disengagement device 5.

[0022] The first engagement / disengagement device 2 is connected between the output shaft of the first motor 3 and the output shaft of the engine 1, and is used to selectively engage or disengage the connection between the output shaft of the first motor 3 and the output shaft of the engine 1.

[0023] The second engagement / disengagement device 5 is connected between the output shaft of the first motor 3 and the input end of the first reduction mechanism 4, and is used to selectively engage or disengage the connection between the output shaft of the first motor 3 and the input end of the first reduction mechanism 4.

[0024] The output end of the first reduction mechanism 4 is adapted to connect to the first wheel on one side, and the second sub-drive mechanism 200 is adapted to drive the first wheel on the other side.

[0025] For details, please refer to the appendix. Figure 2 When the first engagement disconnection device 2 engages the connection between the output shaft of the first motor 3 and the output shaft of the engine 1, and the second engagement disconnection device 5 disconnects the connection between the output shaft of the first motor 3 and the input end of the first reduction mechanism 4, the first reduction mechanism 4 cannot transmit power from the output shaft of the first motor 3 to the first wheel on one side. The second sub-drive mechanism 200 does not work, and the second drive mechanism 300 drives the second wheel to rotate, causing the first wheel to rotate with the vehicle. At this time, the engine 1 does not participate in driving; instead, the engine 1 drives the first motor 3 to generate electricity, allowing the first motor 3 to function as a generator. The electricity generated by the first motor 3 can charge the vehicle battery, giving the vehicle a range-extended drive function to address the user's range anxiety.

[0026] Reference Appendix Figure 3When the first engagement disconnection device 2 disconnects the output shaft of the first motor 3 from the output shaft of the engine 1, and the second engagement disconnection device 5 connects the output shaft of the first motor 3 to the input end of the first reduction mechanism 4, the engine 1 does not work, the first motor 3 is used as a drive motor, the first reduction mechanism 4 can transmit the power of the output shaft of the first motor 3 to the first wheel on one side, the second sub-drive mechanism 200 works to drive the first wheel on the other side to rotate, and the second drive mechanism 300 works to drive the second wheel to rotate, so that the vehicle has a pure electric distributed drive function.

[0027] The entire power drive system, the range-extended drive architecture and the pure electric distributed architecture share the first motor 3. By selectively engaging or disengaging the first engagement / disengagement device 2 and the second engagement / disengagement device 5, the working state of the first motor 3 is switched. In the range-extended drive architecture, the engine 1 drives the first motor 3 to generate electricity, and the first motor 3 is used as a generator. In the pure electric distributed architecture, the engine 1 does not work, and the first motor 3 is used as a drive motor. The first motor 3 transmits power to the first wheel on one side through the first reduction mechanism 4.

[0028] In the power drive system of this application, by controlling the working states of the engine 1, the first motor 3, and the second sub-drive mechanism 200, and selectively engaging or disengaging the first engagement / disengagement device 2 and the second engagement / disengagement device 5, both pure electric distributed drive and range-extended drive functions can be realized. The pure electric distributed architecture and the range-extended architecture share the first motor 3, meaning that based on the traditional distributed electric drive configuration, only the first engagement / disengagement device 2 and the second engagement / disengagement device 5 need to be added to achieve both pure electric distributed drive and range-extended drive functions. This eliminates the need to add a motor or range extender as in existing technologies, reducing costs, minimizing the development of range extenders, and reducing mold development expenses.

[0029] Example 1 Reference Appendix Figure 1 The second sub-drive mechanism 200 includes a second motor 6 and a second reduction mechanism 7. The output shaft of the second motor 6 is connected to the input end of the second reduction mechanism 7, and the output end of the second reduction mechanism 7 is adapted to connect to the first wheel on the other side.

[0030] The first motor 3 and the second motor 6 are integrated into the same housing, making the structure of the first drive mechanism compact and easy to arrange.

[0031] The output shaft of the first motor 3 is parallel to or coaxial with the output shaft of the second motor 6.

[0032] The output shaft of the first motor 3 is designed to be parallel or coaxial with the output shaft of the second motor 6, which allows the first motor 3, the first reduction mechanism 4, the second motor 6 and the second reduction mechanism 7 to be laterally symmetrically distributed and arranged more compactly under the vehicle chassis. This is especially suitable for small vehicles or scenarios with strict space requirements.

[0033] Reference Appendix Figure 1 The first wheel is the front axle wheel, the second wheel is the rear axle wheel, the first drive mechanism is used to drive the front axle wheel to rotate, the second drive mechanism 300 is used to drive the rear axle wheel to rotate, the output end of the first reduction mechanism 4 is adapted to connect to the wheel on one side of the front axle, the output end of the second reduction mechanism 7 is adapted to connect to the wheel on the other side of the front axle, and the second drive mechanism 300 is used to drive the rear axle wheel to rotate.

[0034] The power drive system also includes a front controller 400, which is electrically connected to the first motor 3, the first engagement / disengagement device 2, the second engagement / disengagement device 5 and the second sub-drive mechanism 200, respectively, and is used to control the working state of the first motor 3 and the second sub-drive mechanism 200 and selectively engage or disengage the first engagement / disengagement device 2 and the second engagement / disengagement device 5.

[0035] Reference Appendix Figure 1 The second drive mechanism 300 includes a third motor 8, a third reduction mechanism 9, a fourth reduction mechanism 11, and a fourth motor 10. The output shaft of the third motor 8 is connected to the input end of the third reduction mechanism 9, and the output end of the third reduction mechanism 9 is adapted to connect to the second wheel on one side. The output shaft of the fourth motor 10 is connected to the input end of the fourth reduction mechanism 11, and the output end of the fourth reduction mechanism 11 is adapted to connect to the second wheel on the other side. This allows the third motor 8 and the fourth motor 10 to independently drive the wheels on one side, thereby reducing the power and torque requirements of the third motor 8 and the fourth motor 10. Furthermore, the third motor 8 can be closely coupled to the wheel on one side of the axle, and the fourth motor 10 can be closely coupled to the wheel on the other side of the axle, which is more conducive to the integration, lightweighting, and modular design of the power drive system.

[0036] Reference Appendix Figure 1 The third motor 8 and the fourth motor 10 are integrated into the same housing, making the structure of the second drive mechanism 300 more compact and easier to arrange.

[0037] The output shaft of the third motor 8 is parallel to or coaxial with the output shaft of the fourth motor 10.

[0038] The output shaft of the third motor 8 is designed to be parallel or coaxial with the output shaft of the fourth motor 10, which allows the third motor 8, the third reduction mechanism 9, the fourth motor 10 and the fourth reduction mechanism 11 to be laterally symmetrically distributed. This allows them to be arranged more compactly under the vehicle chassis, making them particularly suitable for small vehicles or scenarios with strict space requirements.

[0039] Reference Appendix Figure 1 The third motor 8 of the second drive mechanism 300 is used to drive one side of the rear axle wheel through the third reduction mechanism 9, and the fourth motor 10 is used to drive the other side of the rear axle wheel through the fourth reduction mechanism 11. The power drive system also includes a rear controller 500, which is electrically connected to the third motor 8 and the fourth motor 10 respectively, and is used to control the working state of the third motor 8 and the fourth motor 10.

[0040] Reference Appendix Figure 2 and Figure 3 The power drive system has a range-extended drive mode and a pure electric distributed drive mode; In range-extended drive mode, the first engagement / disengagement device 2 is engaged, the second engagement / disengagement device 5 is disengaged, the engine 1 drives the first motor 3 to generate electricity, the second motor 6 does not work, and the third motor 8 and the fourth motor 10 are driven.

[0041] In the pure electric distributed drive mode, the first engagement disconnection device 2 is disconnected, the second engagement disconnection device 5 is engaged, the engine 1 is not working, and the first motor 3, the second motor 6, the third motor 8 and the fourth motor 10 are driven to enter the pure electric distributed drive mode.

[0042] Reference Appendix Figure 2 and Figure 3 By controlling the operating states of engine 1, first motor 3, second motor 6, third motor 8, and fourth motor 10, and selectively engaging or disengaging the first engagement / disengagement device 2 and the second engagement / disengagement device 5, the system switches between range-extended drive mode and pure electric distributed drive mode. In pure electric distributed drive mode, first motor 3, second motor 6, third motor 8, and fourth motor 10 participate in driving, achieving four-wheel drive; in range-extended drive mode, third motor 8 and fourth motor 10 participate in driving, achieving two-wheel drive.

[0043] The control parameters for range-extended drive mode and pure electric distributed drive mode are shown in Table 1 below.

[0044] Table 1 The first engagement / disengagement device 2 is a clutch.

[0045] The second engagement / disengagement device 5 is a clutch.

[0046] Reference Appendix Figure 1The first sub-drive mechanism 100 is positioned near the left wheel of the front axle and is used to drive the left wheel of the front axle to rotate. The second sub-drive mechanism 200 is positioned near the right wheel of the front axle and is used to drive the right wheel of the front axle to rotate. Of course, the first sub-drive mechanism 100 can be positioned near the right wheel of the front axle to drive the right wheel to rotate, and the second sub-drive mechanism 200 can be positioned near the left wheel of the front axle to drive the left wheel to rotate.

[0047] Reference Appendix Figure 1 The first reduction mechanism 4 is a parallel shaft reducer, which has a simple structure, low cost, and high transmission efficiency.

[0048] The first reduction mechanism 4 is a two-stage parallel shaft reducer, including an input shaft, an intermediate shaft, and an output shaft. The second engagement / disengagement device 5 is connected between the input shaft of the first reduction mechanism and the output shaft of the first motor 3. The input shaft, intermediate shaft, and output shaft are arranged in parallel and spaced apart. The intermediate shaft is located between the input shaft and the output shaft. One end of the input shaft is connected to the motor output shaft, and the other end is supported on the housing by a bearing. A first-stage drive gear is fixed on the input shaft. The intermediate shaft is supported on the housing by a bearing, and a first-stage driven gear and a second-stage drive gear are fixed on the intermediate shaft. A second-stage driven gear is fixed on the output shaft. The first-stage drive gear meshes with the first-stage driven gear, and the second-stage drive gear meshes with the second-stage driven gear. One end of the output shaft is supported on the housing by a bearing, and the other end of the output shaft is connected to the wheel axle.

[0049] The second reduction mechanism 7 is a parallel shaft reducer, which has a simple structure, low cost, and high transmission efficiency.

[0050] Reference Appendix Figure 1 The second reduction mechanism 7 is a two-stage parallel shaft reducer.

[0051] The third reduction mechanism 9 is a parallel shaft reducer, which has a simple structure, low cost, and high transmission efficiency.

[0052] Reference Appendix Figure 1 The third reduction mechanism 9 is a two-stage parallel shaft reducer.

[0053] The fourth reduction mechanism 11 is a parallel shaft reducer, which has a simple structure, low cost, and high transmission efficiency.

[0054] Reference Appendix Figure 1 The fourth reduction mechanism 11 is a two-stage parallel shaft reducer.

[0055] The power drive system also includes a torsional damper, which is connected between the output shaft of the engine 1 and the first engagement disconnect device 2 to reduce the lateral movement of the engine 1 to the wheel ends and improve the stability of the vehicle during driving.

[0056] Example 2 The second drive mechanism 300 may include a fifth motor, a fifth reduction mechanism, and a sixth reduction mechanism. The fifth motor has dual-ended outputs. One output end of the fifth motor is connected to the input end of the fifth reduction mechanism. The output end of the fifth reduction mechanism is adapted to connect to the second wheel on one side. The other output end of the fifth motor is connected to the input end of the sixth reduction mechanism. The output end of the sixth reduction mechanism is adapted to connect to the second wheel on the other side, so as to drive the second wheels on both sides to rotate simultaneously using the dual-axis output of the fifth motor.

[0057] Alternatively, the first reduction mechanism 4 can also be a planetary gear reducer.

[0058] The second reduction mechanism 7 can also be a planetary gear reducer.

[0059] The third reduction mechanism 9 can also be a planetary gear reducer.

[0060] The fourth reduction mechanism 11 can also be a planetary gear reducer.

[0061] Alternatively, the first engagement disconnection device 2 can be a synchronizer.

[0062] The second engagement / disengagement device 5 can be a synchronizer.

[0063] Example 3 The first wheel and the second wheel can be interchanged. The first wheel is the rear axle wheel, and the second wheel is the front axle wheel. The first drive mechanism is used to drive the rear axle wheel, and the second drive mechanism 300 is used to drive the front axle wheel.

[0064] It should be understood that, apart from the differences mentioned above, the other settings in Embodiments 2 and 3 can be the same as those in Embodiment 1.

[0065] On the other hand, this application also provides a vehicle including the aforementioned power drive system. This vehicle is a pure electric or hybrid vehicle.

[0066] The vehicle also includes a battery pack 600, which can supply power to the first motor 3, the second sub-drive mechanism 200 and the second drive mechanism 300. When the engine 1 drives the first motor 3 to generate electricity, it can charge the battery pack 600, so that the battery pack 600 stores the electricity generated by the first motor 3 and solves the user's range anxiety problem.

[0067] In this application, "multiple" refers to two or more.

[0068] In this application, unless otherwise expressly defined, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0069] The terms “first,” “second,” “third,” “fourth,” etc., in this application (if present) are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0070] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0071] Unless otherwise specified, all steps in this application may be performed sequentially or randomly. For example, if the method includes steps A and B, it means that the method may include steps A and B performed sequentially, or it may include steps B and A performed sequentially. For example, if the method may also include step C, it means that step C may be added to the method in any order. For example, the method may include steps A, B, and C, or it may include steps A, C, and B, or it may include steps C, A, and B, etc.

[0072] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A power drive system, characterized by, It includes a first drive mechanism and a second drive mechanism, wherein the first drive mechanism is used to drive a first wheel and the second drive mechanism is used to drive a second wheel; the first wheel and the second wheel, one of which is a front axle wheel and the other is a rear axle wheel; The first drive mechanism includes a first sub-drive mechanism and a second sub-drive mechanism. The first sub-drive mechanism includes an engine, a first motor, a first reduction mechanism, a first engagement / disengagement device, and a second engagement / disengagement device. The first engagement / disengagement device is connected between the output shaft of the first motor and the output shaft of the engine, and is used to selectively engage or disengage the connection between the output shaft of the first motor and the output shaft of the engine; The second engagement / disengagement device is connected between the output shaft of the first motor and the input end of the first reduction mechanism, and is used to selectively engage or disengage the connection between the output shaft of the first motor and the input end of the first reduction mechanism; The output end of the first deceleration mechanism is adapted to connect to the first wheel on one side, and the second sub-drive mechanism is adapted to drive the first wheel on the other side.

2. The power drive system according to claim 1, characterized in that, The second sub-drive mechanism includes a second motor and a second reduction mechanism. The output shaft of the second motor is connected to the input end of the second reduction mechanism, and the output end of the second reduction mechanism is adapted to connect to the first wheel on the other side.

3. The power drive system of claim 2, wherein, The first motor and the second motor are integrated into the same housing; The output shaft of the first motor is parallel to or coaxial with the output shaft of the second motor.

4. The power drive system of claim 2, wherein, The second drive mechanism includes a third motor, a third reduction mechanism, a fourth reduction mechanism, and a fourth motor. The output shaft of the third motor is connected to the input end of the third reduction mechanism, and the output end of the third reduction mechanism is adapted to connect to one side of the second wheel. The output shaft of the fourth motor is connected to the input end of the fourth reduction mechanism, and the output end of the fourth reduction mechanism is adapted to connect to the other side of the second wheel.

5. The power drive system according to claim 4, characterized in that, The third motor and the fourth motor are integrated into the same housing; The output shaft of the third motor is parallel to or coaxial with the output shaft of the fourth motor.

6. The power drive system according to claim 4, characterized in that, The power drive system has a range-extended drive mode and a pure electric distributed drive mode; In the range-extended drive mode, the first engagement / disengagement device is engaged, the second engagement / disengagement device is disengaged, the engine drives the first motor to generate electricity, the second motor is not working, and the third motor and the fourth motor drive the engine. In the pure electric distributed drive mode, the first engagement disconnection device is disconnected, the second engagement disconnection device is engaged, the engine is not working, and the first motor, the second motor, the third motor and the fourth motor are driven.

7. The power drive system according to claim 1, characterized in that, The second drive mechanism includes a fifth motor, a fifth reduction mechanism, and a sixth reduction mechanism. The fifth motor has dual-end outputs. One output end of the fifth motor is connected to the input end of the fifth reduction mechanism, and the output end of the fifth reduction mechanism is adapted to connect to one side of the second wheel. The other output end of the fifth motor is connected to the input end of the sixth reduction mechanism, and the output end of the sixth reduction mechanism is adapted to connect to the other side of the second wheel.

8. The power drive system of claim 1, wherein, The first engagement / disengagement device is a clutch or synchronizer; and / or, The second engagement / disengagement device is a clutch or a synchronizer.

9. A vehicle characterized by comprising: The power drive system includes any one of claims 1 to 8.

10. The vehicle of claim 9, wherein, It also includes a battery pack that can supply power to the first motor, the second sub-drive mechanism and the second drive mechanism, and can charge the battery pack when the engine drives the first motor to generate electricity.

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