Power driving system and vehicle

Abstract

The utility model relates to a power driving system and a vehicle, the power driving system comprises a first motor, a planet row and a differential mechanism, and the planet row comprises a transmission part and a sun gear which are in transmission connection; the differential mechanism is in transmission connection with the transmission part, and the differential mechanism comprises two half shafts; a motor shaft of the first motor and an input shaft of the sun gear are arranged on the same half shaft in an empty sleeving mode, and the motor shaft of the first motor is in driving connection with the input shaft of the sun gear. By adopting axial integrated layout and planet row transmission, the compactness of the system is improved, the size is reduced, the weight is reduced, the cost is reduced, and the overall layout of the vehicle is optimized.

Description

Technical Field

[0001] The present application relates to the field of automotive technology, and in particular to a power drive system and a vehicle. Background Art

[0002] In related technologies, the power drive system is mainly arranged in a parallel axis manner, that is, various power transmission components (such as motors, reducers, differentials, etc.) are arranged along the X direction (i.e., the front and rear direction) of the vehicle, and power is transmitted through multiple parallel axes (such as motor shafts, transmission shafts, differential shafts, etc.). The parallel axis arrangement often requires the use of multiple intermediate shafts and reduction gears. Therefore, the power drive system is heavy, costly, and occupies a large space, which is not conducive to the spatial layout of the entire vehicle. Utility Model Content

[0003] The embodiments of the present application provide a power drive system and a vehicle, which improve the system compactness, compress the volume, reduce the weight, lower the cost, and optimize the overall layout of the vehicle, so as to at least partially solve the above-mentioned technical problems.

[0004] In order to achieve the above objectives, according to a first aspect of the present application, a power drive system is provided, comprising:

[0005] First motor;

[0006] A planetary gear including a transmission member and a sun gear in driving connection; and

[0007] a differential, in driving connection with the transmission member, the differential comprising two half-shafts;

[0008] The motor shaft of the first motor and the input shaft of the sun gear are loosely mounted on the same half-shaft, and the motor shaft of the first motor and the input shaft of the sun gear are drivingly connected.

[0009] Optionally, the transmission member includes a planetary gear shaft and a first planetary gear, wherein the first planetary gear is mounted on the planetary gear shaft and meshes with the sun gear;

[0010] The differential also includes a differential case, planetary gears and two half-shaft gears. The differential case is fixedly connected to the planetary gear shaft, the planetary gears are rotatably mounted on the differential case, and the two half-shaft gears are respectively mounted on the two half-shafts and respectively mesh with the planetary gears.

[0011] Optionally, the power drive system further includes an engine, which is drive-connected to the differential.

[0012] Optionally, the planetary gear set further includes a second planetary gear and a ring gear, wherein the second planetary gear is mounted on the planetary gear shaft, and the second planetary gear is meshed with the ring gear;

[0013] The engine is capable of driving the ring gear to rotate.

[0014] Optionally, the power drive system also includes a first gear, the engine can drive the first gear to rotate, the ring gear has relatively arranged internal teeth and external teeth, the internal teeth of the ring gear are engaged with the second planetary gear, and the external teeth of the ring gear are engaged with the first gear.

[0015] Optionally, the number of teeth of the first gear is smaller than the number of teeth of the outer teeth of the ring gear.

[0016] Optionally, the power drive system further includes a clutch, and the engine and the first gear are connected via the clutch.

[0017] Optionally, the power drive system further includes a coupling shaft, one end of which is mounted with the first gear, and the other end of which is connected to the output shaft of the engine via the clutch.

[0018] Optionally, the power drive system further includes a second motor, and the engine is capable of driving the second motor to rotate.

[0019] Optionally, the power drive system further includes a second gear and a third gear, the second gear being mounted on the output shaft of the engine, the third gear being mounted on the motor shaft of the second motor, and the third gear being meshed with the second gear so that the engine can drive the second motor to rotate.

[0020] Optionally, the number of teeth of the second gear is smaller than the number of teeth of the third gear.

[0021] Optionally, the motor shaft of the second motor, the output shaft of the engine, and the motor shaft of the first motor are arranged parallel to each other.

[0022] Optionally, in the axial direction of the motor shaft of the first motor, the second motor is located between the first motor and the engine.

[0023] According to a second aspect of the present application, a vehicle is provided, comprising a power drive system as described in any one of the above items.

[0024] In the power drive system of the embodiment of the present application, by loosely fitting the motor shaft of the first motor and the input shaft of the sun gear on the same half-shaft, an axially integrated arrangement of the first motor, the planetary gear and the differential is achieved, thereby simplifying the overall layout of the system, reducing the volume of the system, and optimizing the spatial layout of the entire vehicle. The planetary gear replaces the complex intermediate shaft and reduction gear in the relevant parallel shaft arrangement scheme with its compact structure and multi-point power transmission characteristics, thereby reducing the weight of the system, reducing the volume, and reducing the manufacturing cost. That is, by adopting an axially integrated layout and planetary gear transmission, the compactness of the system is improved, the volume is compressed, the weight is reduced, the cost is reduced, and the overall layout of the vehicle is optimized.

[0025] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0027] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same drawing numbers represent the same parts in the following description.

[0028] Figure 1 This is a first structural diagram of the power drive system disclosed in the present invention;

[0029] Figure 2 is a second structural schematic diagram of the power drive system disclosed in the present invention;

[0030] Figure 3 is a third structural schematic diagram of the power drive system disclosed in the present invention;

[0031] Figure 4 yes Figure 3 The power flow diagram of the power drive system in working mode 1;

[0032] Figure 5 yes Figure 3 The power flow diagram of the power drive system in working mode 2;

[0033] Figure 6 yes Figure 3 Power flow diagram of the power drive system in working mode three.

[0034] Description of reference numerals:

[0035] 100. Power drive system; 1. First motor; 2. Planetary gear; 21. Sun gear; 22. Planetary gear shaft; 23. First planetary gear; 24. Second planetary gear; 25. Ring gear; 3. Differential; 31. Axle shaft; 32. Differential case; 33. Planetary gear; 34. Axle shaft gear; 4. Engine; 51. First gear; 52. Second gear; 53. Third gear; 6. Clutch; 7. Coupling shaft; 8. Second motor; 200. Wheel. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0037] This application provides a power drive system, please refer to Figure 1 , Figures 1 to 3 A schematic diagram of the structure of the power drive system provided in an embodiment of the present application.

[0038] The power drive system 100 includes a first motor 1 , a planetary gear set 2 and a differential 3 .

[0039] The first motor 1 serves as a power source, and the direct connection between its motor shaft and the input shaft of the sun gear 21 ensures direct and efficient transmission of power to the planetary gear 2 .

[0040] The planetary gear 2 is composed of a sun gear 21 and a transmission member, wherein the sun gear 21 receives the power of the motor, and the transmission member is responsible for transmitting the received power to the differential 3, thereby achieving power distribution and deceleration.

[0041] The differential 3 comprises two half-shafts 31 connected to the wheels 200 on either side of the vehicle. This ensures that the wheels 200 rotate at different speeds during cornering, maintaining smooth driving. The motor shaft of the first motor 1 and the input shaft of the sun gear 21 are loosely mounted on the same half-shaft 31, allowing the first motor 1, planetary gear set 2, and differential 3 to be axially integrated. This layout not only simplifies the system structure but also further reduces overall size and optimizes the space.

[0042] In the technical solution of the present application, by loosely fitting the motor shaft of the first motor 1 and the input shaft of the sun gear 21 on the same half-shaft 31, an axially integrated arrangement of the first motor 1, the planetary gear 2 and the differential 3 is achieved, thereby simplifying the overall layout of the system, reducing the volume of the system, and optimizing the spatial layout of the entire vehicle. The planetary gear 2, with its compact structure and multi-point power transmission characteristics, replaces the complex intermediate shaft and reduction gear in the relevant parallel shaft arrangement scheme, thereby reducing the weight of the system, reducing the volume, and reducing the manufacturing cost. That is, by adopting the axially integrated layout and the planetary gear 2 transmission, the compactness of the system is improved, the volume is compressed, the weight is reduced, the cost is reduced, and the overall layout of the vehicle is optimized.

[0043] It can be understood that the integrated axial arrangement of the first motor 1, the planetary gear 2 and the differential 3 (i.e., the Y direction of the vehicle, i.e., the left and right directions of the vehicle) and the reduction of the arrangement along the X direction (i.e., the front and rear directions) of the vehicle can significantly reduce the size of the power drive system 100 in the X direction (i.e., the front and rear directions) of the vehicle, and can be better applied to small vehicles.

[0044] Continue reading Figure 1 In some embodiments, the transmission member includes a planetary shaft 22 and a first planetary gear 23, the first planetary gear 23 is mounted on the planetary shaft 22 and meshes with the sun gear 21; the differential 3 also includes a differential case 32, planetary gears 33 and two side shaft gears 34, the differential case 32 is fixedly connected to the planetary shaft 22, the planetary gears 33 are rotatably mounted on the differential case 32, and the two side shaft gears 34 are respectively mounted on the two half shafts 31 and respectively mesh with the planetary gears 33. In these embodiments, power is first output by the first motor 1 to the sun gear 21. Since the sun gear 21 is engaged with the first planetary gear 23, the power is then transmitted to the planetary gear shaft 22 through the first planetary gear 33. The rotation of the planetary gear shaft 22 is indirectly transmitted to the planetary gear 33 through the fixedly connected differential case 32. The two half-shaft gears 34 are engaged with the planetary gears 33. After receiving the power from the planetary gears 33, they are respectively transmitted to the corresponding half-shafts 31, and finally transmitted to the wheels 200, completing the efficient transmission of power from the first motor 1 to the wheels 200.

[0045] See also Figure 2In some embodiments, the power drive system 100 further includes an engine 4, which is in driving connection with the differential 3. In these embodiments, the addition of the engine 4 provides an additional power source, allowing the system to rely on pure electric drive from the first motor 1, switch to engine 4 drive, or both work together, thereby enhancing the adaptability and flexibility of the vehicle. For example, under certain operating conditions such as low speed and high load, the engine 4 may be more efficient than the electric motor. Through a reasonable control strategy, an optimal allocation can be made between the two power sources to achieve a higher energy efficiency ratio and energy conservation and emission reduction effects. The hybrid configuration allows full utilization of the high power output of the engine 4 during the acceleration phase, combined with the immediate response capability of the first motor 1, to achieve a stronger acceleration and driving experience. Combined with battery energy storage and fuel supply, the vehicle's total cruising range is significantly extended. Especially on long-distance trips, there is no need to worry about the risk of power exhaustion, which enhances the driver's confidence and convenience.

[0046] Continue reading Figure 2 In some embodiments, the planetary gear set 2 further includes a second planetary gear 24 and a ring gear 25. The second planetary gear 24 is mounted on the planetary gear shaft 22 and meshes with the ring gear 25. The engine 4 can drive the ring gear 25 to rotate. In these embodiments, power is first transmitted from the engine 4 to the ring gear 25. Since the ring gear 25 meshes with the second planetary gear 24, the power is then transferred to the planetary gear shaft 22 via the second planetary gear 33. The rotation of the planetary gear shaft 22 is indirectly transmitted to the planetary gear 33 via the fixed differential case 32. The two side gears 34 mesh with the planetary gears 33. After receiving the power from the planetary gears 33, they transmit it to the corresponding side gears 31, and ultimately to the wheels 200. This achieves efficient power transmission from the engine 4 to the wheels 200. The power transmission from the engine 4 to the differential 3 and the power transmission from the first motor 1 to the differential 3 share the planetary gear set 2, further simplifying the system structure, reducing the overall size, and optimizing the spatial layout.

[0047] It can be understood that the engine 4 can drive the ring gear 25 to rotate, which means that the engine 4 can drive the ring gear 25 to rotate as a power source. The engine 4 can directly drive the ring gear 25 to rotate, or it can indirectly drive the ring gear 25 to rotate.

[0048] Continue reading Figure 2In some embodiments, the power drive system 100 further includes a first gear 51. The engine 4 can drive the first gear 51 to rotate. The ring gear 25 has internal and external teeth arranged in opposite directions. The internal teeth of the ring gear 25 mesh with the second planetary gears 24, and the external teeth of the ring gear 25 mesh with the first gear 51. In these embodiments, the engine 4 can drive the first gear 51 to rotate, and the external teeth of the ring gear 25 mesh with the first gear 51. That is, the power of the engine 4 is indirectly transmitted to the ring gear 25 via the first gear 51, thereby enabling the engine 4 to drive the ring gear 25 to rotate. Through the first gear 51, the system can more flexibly adjust torque, smooth power output, protect the engine 4 and the ring gear 25, achieve multiple transmission ratios, and improve overall efficiency to meet diverse application requirements. The ring gear 25 has internal and external teeth arranged in opposite directions, respectively, which can achieve transmission connections between the ring gear 25 and the second planetary gears 24 and between the ring gear 25 and the first gear 51. This allows the ring gear 25 to be shared, further simplifying the system structure, reducing the overall size, and optimizing the spatial layout.

[0049] In some embodiments, the number of teeth on the first gear 51 is smaller than the number of teeth on the outer teeth of the ring gear 25. In these embodiments, the smaller number of teeth on the first gear 51 than on the outer teeth of the ring gear 25 allows the first gear 51 and the ring gear 25 to form a reduction mechanism. This can optimize the output characteristics of the power system through the deceleration and torque-increasing effect, thereby providing better power performance and operational performance in specific application scenarios.

[0050] Continue reading Figure 2 In some embodiments, the power drive system 100 further includes a clutch 6, through which the engine 4 and the first gear 51 are connected. In these embodiments, the clutch 6 connects and disconnects the power between the engine 4 and the first gear 51. By operating the clutch 6, power can be smoothly transferred to the first gear 51 while the engine 4 is running, and then further transferred. The clutch 6 also allows for temporary power cutoff during gear shifting or maintenance, protecting the engine 4 and transmission system components from damage, thereby ensuring driver safety and vehicle performance.

[0051] In some embodiments, the clutch 6 is a one-way clutch 6, which is configured to transmit power from the engine 4 toward the first gear 51. In this way, it ensures that power can only be transmitted from the engine 4 to the first gear 51 in one direction, preventing damage caused by reverse torque and providing additional protection. The one-way clutch 6 helps to eliminate the impact during downshifting, making gear shifting smoother and improving driving comfort. By controlling the direction of power transmission, the loss of related friction plates can be reduced, the service life of the transmission system can be extended, the reliability and durability of the system can be improved, and it also helps to improve the overall performance and driving experience of the vehicle.

[0052] This application does not limit the specific method of how to connect the engine 4 and the first gear 51 through the clutch 6. For example, the first gear 51 can be directly fixed on the clutch 6. For example, the clutch 6 can be built into the connection between the output shaft of the engine 4 and the first gear 51 to form an integrated design.

[0053] Continue reading Figure 2 In some embodiments, the power drive system 100 further includes a coupling shaft 7, one end of which is mounted with a first gear 51, and the other end of the coupling shaft 7 is connected to the output shaft of the engine 4 via a clutch 6. In these embodiments, the presence of the coupling shaft 7 allows the first gear 51 and the clutch 6 to be independently designed and adjusted, and also allows for a certain amount of space or angle adjustment between the output shaft of the engine 4 and the first gear 51, providing greater design freedom. The coupling shaft 7 can absorb minor deviations caused by manufacturing tolerances, thermal expansion, or vibration, thereby improving power transmission. It can also serve as a buffer element to reduce impact loads that may occur during direct connection, thereby improving reliability.

[0054] See also Figure 3 In some embodiments, the power drive system 100 further includes a second motor 8, and the engine 4 can drive the second motor 8 to rotate. In these embodiments, the engine 4 can drive the second motor 8 to rotate, and the power of the engine 4 can not only be transmitted through the differential 3 to drive the vehicle, but can also be provided to the second motor 8 for use, and can be converted into electrical energy by the second motor 8 for charging the battery or meeting other power needs in the vehicle, thereby improving the energy efficiency and energy utilization of the entire power system. Specifically, the power drive system 100 further includes a clutch 6, and the engine 4 and the first gear 51 are connected by the clutch 6. When the clutch 6 cuts off the power flow between the engine 4 and the first gear 51, the power output of the engine 4 is transmitted to the second motor 8.

[0055] Continue reading Figure 3 In some embodiments, the power drive system 100 further includes a second gear 52 and a third gear 53. The second gear 52 is mounted on the output shaft of the engine 4, and the third gear 53 is mounted on the motor shaft of the second motor 8. The third gear 53 and the second gear 52 mesh with each other, enabling the engine 4 to drive the second motor 8 to rotate. In these embodiments, power is transmitted from the engine 4 to the third gear 53, and then to the second motor 8 via the second gear 52 meshing with the third gear 53. The power of the engine 4 can be efficiently transmitted to the second motor 8, thereby enabling the second motor 8 to operate and achieving effective conversion and utilization of power.

[0056] In some embodiments, the number of teeth on the second gear 52 is smaller than the number of teeth on the third gear 53. In these embodiments, the number of teeth on the second gear 52 is smaller than the number of teeth on the third gear 53, so that the second gear 52 and the third gear 53 form a reduction mechanism. This can improve the output of the engine 4 to meet the needs of the second motor 8 through the deceleration and torque-increasing effect, ensuring that the entire power system operates in an efficient, safe, and reliable state.

[0057] Continue reading Figure 3 In some embodiments, the motor shaft of the second motor 8, the output shaft of the engine 4, and the motor shaft of the first motor 1 are arranged parallel to each other. In these embodiments, due to the coaxial integrated design of the first motor 1, the planetary gear set 2, and the differential 3, the motor shaft of the second motor 8 and the output shaft of the engine 4 are also parallel to the axial directions of the planetary gear set 2 and the differential 3. The output shaft of the engine 4 facilitates efficient power transmission between the engine 4 and the differential 3 directly or indirectly through gears or other transmission devices (for example, in some embodiments, through the meshing of the external teeth of the first gear 51 and the ring gear 25), reducing losses during power transmission, contributing to a compact mechanical design, and enabling a more efficient layout of the power system within a limited space, making more reasonable use of the vehicle's interior space. The parallel arrangement also makes the interaction between the components more intuitive, facilitating fault diagnosis and daily maintenance.

[0058] Continue reading Figure 3 In some embodiments, the second motor 8 is located between the first motor 1 and the engine 4 in the axial direction of the motor shaft of the first motor 1. In these embodiments, the second motor 8 is located between the first motor 1 and the engine 4 in the axial direction of the motor shaft of the first motor 1, that is, in the axial direction of the motor shaft of the first motor 1 (that is, the Y direction of the vehicle, that is, the left and right direction of the vehicle), the second motor 8, the first motor 1 and the engine 4 are staggered to avoid mutual interference in the X direction (that is, the front and back direction), which can be more compact and conducive to layout. In addition, since the main task of the second motor 8 is charging or auxiliary power supply, its workload is relatively low, so the heat generated is less than the first motor 1 and engine 4 that directly drive the vehicle. The second motor 8 is located between the first motor 1 and the engine 4, that is, the first motor 1 and the engine 4 with larger heat generation are arranged close to the outside of the vehicle, which is conducive to heat dissipation of the first motor 1 and the engine 4.

[0059] According to the second aspect of the present application, a vehicle is provided, including a power drive system 100. The structure of the power drive system 100 is as described above. Since the vehicle adopts all the technical solutions of all the above embodiments, it at least has the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0060] The following describes the working modes of the power drive system 100 in some embodiments:

[0061] See also Figure 4 , working mode 1 of the power drive system 100:

[0062] The clutch 6 is disengaged, and the power output by the engine 4 is output to the motor shaft of the second motor 8 through the second gear 52 and the third gear 53, driving the second motor 8. In this mode, the power of the engine 4 is converted into electrical energy, which can be used to charge the battery or meet other power needs of the vehicle.

[0063] See also Figure 5 , working mode 2 of the power drive system 100:

[0064] When the first motor 1 is in operation, the power output by the first motor 1 drives the sun gear 21 to rotate. At this time, the ring gear 25 of the planetary gear set 2 is fixed, and the first planetary gear 23 is driven by the sun gear 21. In turn, the differential case 32 is driven to rotate via the planetary gear shaft 22, thereby transmitting the power of the second motor 8 to the differential 3 and then to the wheels 200. This mode realizes the direct drive of the vehicle by the first motor 1 and is a pure electric drive mode.

[0065] See also Figure 6 , working mode three of the power drive system 100:

[0066] When first motor 1 is not operating and outputting power (for example, when the battery level is low), clutch 6 engages, and the power from the output shaft of engine 4 is transmitted through clutch 6 to coupling shaft 7, and then through first gear 51 to ring gear 25. Sun gear 21 is now fixed, and the power input from ring gear 25 drives the second planetary gears 24, which in turn rotate the differential case 32 via the planetary gear shaft 22, thereby transmitting the power from engine 4 to differential 3 and, in turn, to wheels 200. This mode ensures that engine 4 can directly drive the vehicle when first motor 1 is inoperative, embodying the backup drive function of conventional engine 4 in a hybrid system.

[0067] It can be understood that working mode one can be combined with working mode two, and working mode two can be combined with working mode three to enrich the working modes. The vehicle can flexibly switch working modes under different working conditions and energy states, which enhances the vehicle's adaptability and endurance, and helps to improve the vehicle's overall performance and energy utilization efficiency.

[0068] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0069] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0070] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0071] The above are merely preferred embodiments of the present application and do not constitute any form of limitation to the present application. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A power drive system, characterized in that: include: First motor; A planetary gear, including a transmission member and a sun gear connected in a transmission manner; as well as, a differential, in driving connection with the transmission member, the differential comprising two half-shafts; The motor shaft of the first motor and the input shaft of the sun gear are loosely mounted on the same half-shaft, and the motor shaft of the first motor and the input shaft of the sun gear are drivingly connected.

2. The power drive system according to claim 1, characterized in that: The transmission member includes a planetary gear shaft and a first planetary gear, wherein the first planetary gear is mounted on the planetary gear shaft and meshes with the sun gear; The differential also includes a differential case, planetary gears and two half-shaft gears. The differential case is fixedly connected to the planetary gear shaft, the planetary gears are rotatably mounted on the differential case, and the two half-shaft gears are respectively mounted on the two half-shafts and respectively mesh with the planetary gears.

3. The power drive system according to claim 2, characterized in that: The power drive system further includes an engine, which is drivingly connected to the differential.

4. The power drive system according to claim 3, characterized in that: The planetary gear set further includes a second planetary gear and a ring gear, wherein the second planetary gear is mounted on the planetary gear shaft and meshes with the ring gear; The engine is capable of driving the ring gear to rotate.

5. The power drive system according to claim 4, characterized in that: The power drive system also includes a first gear, and the engine can drive the first gear to rotate. The ring gear has internal teeth and external teeth arranged opposite to each other. The internal teeth of the ring gear are engaged with the second planetary gear, and the external teeth of the ring gear are engaged with the first gear.

6. The power drive system according to claim 5, characterized in that: The number of teeth of the first gear is smaller than the number of teeth of the outer teeth of the ring gear.

7. The power drive system according to claim 5, characterized in that: The power drive system further includes a clutch, and the engine and the first gear are connected via the clutch.

8. The power drive system according to claim 7, characterized in that: The power drive system further includes a coupling shaft, one end of which is mounted with the first gear, and the other end of which is connected to the output shaft of the engine via the clutch.

9. The power drive system according to any one of claims 3 to 8, characterized in that: The power drive system further includes a second motor, and the engine is capable of driving the second motor to rotate.

10. The power drive system according to claim 9, characterized in that: The power drive system also includes a second gear and a third gear, the second gear is mounted on the output shaft of the engine, the third gear is mounted on the motor shaft of the second motor, and the third gear is engaged with the second gear so that the engine can drive the second motor to rotate.

11. The power drive system according to claim 10, characterized in that: The number of teeth of the second gear is smaller than the number of teeth of the third gear.

12. The power drive system according to claim 9, characterized in that: The motor shaft of the second motor, the output shaft of the engine, and the motor shaft of the first motor are arranged parallel to each other.

13. The power drive system according to claim 12, characterized in that: The second motor is located between the first motor and the engine in an axial direction of the motor shaft of the first motor.

14. A vehicle, characterized in that: Comprising the power drive system according to any one of claims 1 to 13.

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