Power transmission system of vehicle

Abstract

The utility model provides a power transmission system of a vehicle, which belongs to the technical field of vehicles and comprises an engine, a first rotating shaft, a driving motor and a transmission connecting mechanism, and the first rotating shaft and an output shaft of the engine are coaxially arranged; a rotor of the driving motor is arranged on the first rotating shaft in a sleeving manner and is in transmission connection with the first rotating shaft through a transmission gear set; the transmission connection mechanism is arranged between the engine and the driving motor, and the transmission connection mechanism is used for connecting or disconnecting power transmission between an output shaft of the engine and the first rotating shaft; wherein the vehicle is driven by the engine or the driving motor to run. The rotor of the driving motor is arranged on the first rotating shaft in a sleeving manner and is in transmission connection with the first rotating shaft through the transmission gear set, so that the rotating speed output by an engine can be directly transmitted to a rear axle and / or a front axle of the vehicle without being changed through a gearbox when the vehicle is in a high-speed direct-drive mode.

Description

Technical Field

[0001] This utility model belongs to the field of vehicle technology, and in particular relates to a vehicle power transmission system. Background Technology

[0002] With the continuous depletion of energy resources, the development and utilization of new energy vehicles has gradually become a trend. Hybrid vehicles, as a type of new energy vehicle, combine an engine and an electric motor. Especially when driving at low speeds and in urban areas, the use of the electric motor can significantly reduce fuel consumption. Furthermore, through vehicle braking energy recovery, fuel efficiency can be further improved. Therefore, hybrid vehicles have advantages such as good fuel economy, lower exhaust emissions than pure gasoline vehicles, and strong cruising ability.

[0003] In existing dual-motor series-parallel longitudinal configurations, due to the need to achieve four different drive types and the constraints of vehicle installation space, the output shafts of the drive motor and the engine often need to be coaxially arranged. In existing technologies, the rotor of the drive motor is selectively coupled to the output shaft of the engine so that the drive motor and the engine can jointly drive the vehicle in parallel mode. However, the aforementioned coaxial arrangement requires a gearbox to be placed after the drive motor so that the speed of the drive motor matches the speed required by the vehicle. If the vehicle installation space is insufficient or the manufacturing cost of the vehicle needs to be reduced, a gearbox must be placed after the drive motor. With this arrangement, in high-speed direct drive mode, the kinetic energy generated by the engine must pass through the gearbox before it can be transmitted to the rear axle and / or the front axle, which will reduce the distance traveled by the vehicle in high-speed direct drive mode, thereby affecting the fuel economy of the vehicle in high-speed direct drive mode, and making it difficult to directly transmit the kinetic energy of the engine to the rear axle and / or the front axle. Utility Model Content

[0004] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a vehicle power transmission system to solve the problem that when a gearbox is set after the drive motor to meet the installation requirements of the vehicle, the fuel economy of the vehicle in high-speed direct drive mode will be reduced.

[0005] To achieve the above and other related objectives, this utility model provides a vehicle power transmission system, comprising:

[0006] engine;

[0007] A first rotating shaft is coaxially arranged with the output shaft of the engine;

[0008] A drive motor, wherein the rotor of the drive motor is sleeved on the first rotating shaft, and the rotor of the drive motor is connected to the first rotating shaft through a transmission gear set;

[0009] A transmission connection mechanism is arranged between the engine and the driving motor, and is used to connect or disconnect the power transmission between the output shaft of the engine and the first rotating shaft.

[0010] The vehicle is driven by the engine and / or the driving motor.

[0011] Optionally, the rotor of the driving motor is arranged on the first rotating shaft through a rotor hollow shaft sleeve, two groups of hollow shaft bearings are arranged on the rotor hollow shaft, the rotor of the driving motor is arranged between the two groups of hollow shaft bearings, and the first rotating shaft is sequentially provided with at least two supporting bearings along the axial direction of the first rotating shaft.

[0012] Optionally, the first rotating shaft is coaxially arranged with the rotor hollow shaft.

[0013] Optionally, the transmission gear set comprises a first gear, a second gear, a third gear, a fourth gear and a second rotating shaft arranged in parallel with the first rotating shaft, the first gear is fixedly connected with the hollow shaft bearing, the fourth gear is fixedly connected with the first rotating shaft, the second gear and the third gear are sequentially fixedly connected on the second rotating shaft along the axial direction of the second rotating shaft, and the first gear is engaged with the second gear, and the third gear is engaged with the fourth gear.

[0014] Optionally, the first rotating shaft is sequentially provided with three groups of supporting bearings, two groups of the supporting bearings are arranged on the two sides of the fourth gear respectively, and the other group of the supporting bearings is arranged on the side of the driving motor close to the transmission connection mechanism.

[0015] Optionally, a generator speed regulating motor is further arranged between the engine and the transmission connection mechanism, the rotor of the generator speed regulating motor is connected with the output shaft of the engine, the output shaft of the engine is used to drive the rotor of the generator speed regulating motor to rotate, and the power transmission system of the vehicle further comprises an electric control system, which is electrically connected with the generator speed regulating motor and the driving motor respectively.

[0016] Optionally, a shock absorber is further arranged between the engine and the generator speed regulating motor.

[0017] Optionally, a transfer is further arranged on the side of the driving motor away from the engine, and the transfer is used to transmit the kinetic energy of the first rotating shaft to the rear axle and / or the front axle of the vehicle.

[0018] Optionally, the power divider comprises a third rotating shaft, a fourth rotating shaft, a sixth gear, a seventh gear, a ninth gear and a tenth gear, the third rotating shaft is coaxially arranged with the first rotating shaft, the sixth gear is fixedly connected to the first rotating shaft, the seventh gear is fixedly connected to the third rotating shaft, a first coaxial device is arranged between the sixth gear and the seventh gear, the ninth gear is sleeved on the fourth rotating shaft, the tenth gear is fixedly connected to the fourth rotating shaft, a second coaxial device is arranged between the tenth gear and the ninth gear, and the ninth gear is dynamically coupled with the seventh gear.

[0019] Optionally, the power divider further comprises a fifth rotating shaft, a fifth gear, an eleventh gear and an eighth gear, the fifth gear is sleeved on the first rotating shaft, the fifth gear, the sixth gear and the seventh gear are sequentially arranged along the axial direction of the first rotating shaft, the first coaxial device comprises a sixth sleeve sleeved on the sixth gear and engaged with the sixth gear, a fifth gear engaging spline arranged on the fifth gear and a seventh gear engaging spline arranged on the seventh gear, the sixth sleeve is used for engaging with the fifth gear engaging spline or the seventh gear engaging spline, the eleventh gear and the eighth gear are fixedly connected to the fifth rotating shaft, the eighth gear is engaged with the seventh gear and the ninth gear respectively, and the eleventh gear is engaged with the fifth gear.

[0020] As described above, the power transmission system of the vehicle has the following beneficial effects: by sleeving the rotor of the driving motor on the first rotating shaft and connecting the first rotating shaft and the driving motor through the transmission gear set, the rotation speed of the engine output can be directly transmitted to the rear axle and / or the front axle of the vehicle without being changed by the gearbox in the high-speed direct drive mode, the kinetic energy of the engine in the high-speed direct drive mode is efficiently utilized, the limited installation space of the vehicle is adapted, and the manufacturing cost of the vehicle is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the power transmission system of the vehicle of the embodiment of the utility model.

[0022] Figure 2 It is an energy transmission schematic diagram (shown by a red line) of the vehicle in the pure electric mode of the embodiment of the utility model.

[0023] Figure 3 It is an energy transmission schematic diagram (shown by a red line and a green line) of the vehicle in the series mode of the embodiment of the utility model.

[0024] Figure 4 It is an energy transmission schematic diagram (shown by a red line and a green line) of the vehicle in the parallel mode of the embodiment of the utility model.

[0025] Figure 5 The energy transmission schematic diagram (shown by a green line) of the vehicle in the high-speed direct drive mode of the embodiment of the utility model.

[0026] Figure 6 The bearing installation schematic diagram of the transmission gear set and the driving motor of the embodiment of the utility model.

[0027] Figure 7 The structure schematic diagram of the transfer case of the embodiment of the utility model.

[0028] Figure 8 The energy transmission schematic diagram (shown by a red line) when the transfer case of the embodiment of the utility model is two drive.

[0029] Figure 9 The energy transmission schematic diagram (shown by a red line) when the transfer case of the embodiment of the utility model is four drive low gear.

[0030] Figure 10 The energy transmission schematic diagram (shown by a red line) when the transfer case of the embodiment of the utility model is four drive high gear.

[0031] Label explanation: 1, engine; 2, shock absorber; 3, power generation speed regulation motor; 4, transmission connecting mechanism; 5, transmission gear set; L1 first gear; L2 second gear; L3 third gear; L4 fourth gear; Z1 first rotating shaft; Z2 second rotating shaft; 6, transfer case; L5 fifth gear; L6 sixth gear; L7 seventh gear; L8 eighth gear; L9 ninth gear; L10 tenth gear; L11 eleventh gear; Z3 third rotating shaft; Z4 fourth rotating shaft; Z5 fifth rotating shaft; T1 first coaxial device; T2 second coaxial device; 7, driving motor; 8, battery; 9, controller; 10, supporting bearing; 11, rotor hollow shaft. DETAILED DESCRIPTION

[0032] The following specific embodiments illustrate the implementation of the utility model, and those skilled in the art can easily understand other advantages and effects of the utility model from the content disclosed in the specification.

[0033] Please refer to Figures 1 to 10It is to be understood that the structures, proportions, sizes and the like shown in the drawings of the present specification are merely used to illustrate the content disclosed in the present specification, to be understood and read by those skilled in the art, and are not used to limit the implementation of the present application, and therefore do not have substantial technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effect and purpose of the present application, should still fall within the scope of the technical content disclosed by the present application. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" in the present specification are merely for the convenience of clear description, and are not used to limit the scope of the present application. The change or adjustment of the relative relationship, without substantially changing the technical content, is also considered as the implementation of the present application.

[0034] In order to describe the present application in detail, the power transmission system of a vehicle is described as follows:

[0035] Please refer to Figures 1 to 5 The present application provides a power transmission system of a vehicle, comprising an engine 1, a first rotating shaft Z1, a driving motor 7 and a transmission connection mechanism 4. The first rotating shaft Z1 is coaxially arranged with the output shaft of the engine 1. The rotor of the driving motor 7 is sleeved on the first rotating shaft Z1, and the rotor of the driving motor 7 is transmissionally connected with the first rotating shaft Z1 through a transmission gear set 5. The transmission connection mechanism 4 is arranged between the engine 1 and the driving motor 7, and is used to communicate or disconnect the power transmission between the output shaft of the engine 1 and the first rotating shaft Z1. Wherein, the vehicle is driven to run by the engine 1 and / or the driving motor 7. By sleeving the rotor of the driving motor 7 on the first rotating shaft Z1 and transmissionally connecting the rotor of the driving motor 7 with the first rotating shaft Z1 through the transmission gear set 5, the rotation speed output by the engine 1 can be directly transmitted to the rear axle and / or the front axle of the vehicle without being changed by the gearbox in the high-speed direct drive mode, so as to ensure the efficient use of kinetic energy in the high-speed direct drive mode of the engine, and at the same time, the limited installation space of the vehicle is adapted, and the manufacturing cost of the vehicle is reduced. Wherein, the transmission connection mechanism 4 can be a clutch, and in the present embodiment, the transmission connection mechanism 4 is a multi-plate hydraulic clutch.

[0036] As Figure 6As shown, the rotor of the driving motor 7 is sleeved on the first rotating shaft Z1 through the rotor hollow shaft 11, two groups of hollow shaft bearings are arranged on the rotor hollow shaft 11, the rotor of the driving motor 7 is arranged between the two groups of hollow shaft bearings, and the first rotating shaft Z1 is sequentially provided with at least two support bearings 10 along the axial direction of the first rotating shaft Z1. By arranging two groups of hollow shaft bearings on the rotor hollow shaft 11, the support of the hollow shaft sleeve can be ensured, and by arranging multiple support bearings 10 on the first rotating shaft Z1, the support property of the first rotating shaft Z1 can be ensured, so that the first rotating shaft Z1 is prevented from being deformed in the rotating process, and the rotor hollow shaft 11 is prevented from being blocked when being sleeved around the axis of the first rotating shaft Z1 and being rotated relative to the first rotating shaft Z1. In the embodiment, the first rotating shaft Z1 is coaxially arranged with the rotor hollow shaft 11, so that the gap between the first rotating shaft Z1 and the rotor hollow shaft 11 in the radial direction is kept consistent, and the first rotating shaft Z1 is ensured to rotate smoothly around the axis of the first rotating shaft Z1 relative to the hollow shaft sleeve, so that the blocking or jamming is avoided.

[0037] The transmission gear set 5 includes the first gear L1, the second gear L2, the third gear L3, the fourth gear L4, and the second rotating shaft Z2 arranged in parallel with the first rotating shaft Z1. The first gear L1 is fixedly connected with the hollow shaft bearing, the fourth gear L4 is fixedly connected with the first rotating shaft Z1, the second gear L2 and the third gear L3 are sequentially fixedly connected on the second rotating shaft Z2 along the axial direction of the second rotating shaft Z2, and the first gear L1 is engaged with the second gear L2 and the third gear L3 is engaged with the fourth gear L4. The above structure is simple, has high transmission efficiency, and is compact. By adjusting the speed ratio between the gears, the rotating speed output by the driving motor 7 can be matched with the use requirement of the vehicle. The arrangement mode of the transmission gear set 5 can be adjusted according to the actual use requirement, which is not limited herein.

[0038] Specifically, the first rotating shaft Z1 is sequentially provided with three groups of support bearings 10, two groups of support bearings 10 are arranged on the two sides of the fourth gear L4, and the other group of support bearings 10 is arranged on the side of the driving motor 7 close to the transmission connection mechanism 4. By arranging three groups of support bearings, the support property of the first rotating shaft Z1 can be improved, and the bending or torsional deformation of the first rotating shaft Z1 in the rotating process can be avoided. In some embodiments, the first rotating shaft Z1 can be sequentially provided with four groups of support bearings 10, and the number of support bearings 10 arranged on the first rotating shaft Z1 can be adjusted according to the actual use requirement.

[0039] As Figures 2 to 5As shown, the power transmission system of the vehicle further comprises a power generation speed regulation motor 3, a rotor of the power generation speed regulation motor 3 is connected with an output shaft of the engine 1, the output shaft of the engine 1 is used to drive the rotor of the power generation speed regulation motor 3 to rotate, the power transmission system of the vehicle further comprises an electric control system, the electric control system is electrically connected with the power generation speed regulation motor 3 and the driving motor 7 respectively. It can be understood that the electric control system comprises a controller 9 and a battery 8, the battery 8 is used to store electric energy, the controller 9 is used to receive the command of the driver and switch among four power modes according to the command of the driver, the four power modes comprise a pure electric mode, a series mode, a parallel mode and a high-speed direct drive mode. When the transmission connecting mechanism 4 is disconnected and the engine 1 is started, the engine 1 drives the rotor of the power generation speed regulation motor 3 to rotate, at this time, the power generation speed regulation motor 3 is used as a generator to charge the battery 8 in the electric control system, at the same time, the battery 8 supplies power to the driving motor 7 to drive the driving motor 7 to rotate and drive the vehicle to run, this mode is the series mode; when the transmission connecting mechanism 4 is disconnected and the engine 1 is not started, at this time, the battery 8 in the electric control system drives the driving motor 7 to rotate to drive the vehicle to run, this mode is the pure electric mode; when the transmission connecting mechanism 4 is coupled and the engine 1 is started, the battery 8 in the electric control system supplies power to the driving motor 7 to drive the driving motor 7 to rotate and drive the vehicle to run together with the engine 1, this mode is the parallel mode; when the transmission connecting mechanism 4 is coupled and the engine 1 is started, and the battery 8 in the electric control system does not supply power to the driving motor 7, at this time, only the engine 1 drives the vehicle to run, this mode is the high-speed direct drive mode. The transmission connecting mechanism 4 has two disconnection coupling parts respectively connected with the output shaft of the engine 1 and the driving motor 7, when the two disconnection coupling parts are combined, the output shaft of the engine 1 and the first rotating shaft are power connected, when the two disconnection coupling parts are separated, the output shaft of the engine 1 is disconnected with the first rotating shaft in power, by arranging the transmission connecting mechanism 4 between the power generation speed regulation motor 3 and the driving motor 7, the driving motor 7 can regulate the speed of the disconnection coupling part connected with it, the power of the power generation speed regulation motor 3 can also be directly transmitted to the engine 1 to start the engine 1, so that the output shaft of the engine 1 quickly reaches the target rotating speed to regulate the speed of the corresponding disconnection coupling part, at this time, the power generation speed regulation motor 3 is used as a starter to realize inductive switching and small wear when the vehicle is switched from the series mode or the pure electric mode to the hybrid mode or the high-speed direct drive mode through the transmission connecting mechanism 4. The above arrangement structure is simple, the driving motor 7 and the engine 1 are coupled smoothly, the driving and riding experience of the driver and the passenger is good, and the economic value is good.

[0040] The damper 2 is provided between the engine 1 and the motor generator 3. In the embodiment, the damper 2 has a limited torque function, which can realize torque overload protection, avoid the instantaneous torque overshoot of forward driving or reverse driving, and avoid the damage of the power transmission system of the vehicle due to the impact. Since the damper 2 has a large angle and low stiffness torsional damping structure, it can filter larger vibrations, so that the damped power has higher adaptability and the driving experience is more comfortable.

[0041] As shown in Figures 7 to 10 , the drive motor 7 is further provided with a transfer 6 away from the engine 1, and the transfer 6 is used for transmitting the kinetic energy of the first rotating shaft Z1 to the rear axle and / or the front axle of the vehicle. By providing the transfer 6, the vehicle can realize the switching between four-wheel drive and two-wheel drive in different power modes, and improve the adaptability of the vehicle to different environments and the driving experience of the driver and passenger. In the embodiment, the vehicle is a commercial vehicle, which needs to have a large driving force, so the rear wheels are mainly driven, and the power is transmitted to the front wheels through the transfer to realize four-wheel drive. In some embodiments, the vehicle can be a passenger car, and the front wheels can be mainly driven, and the power can be transmitted to the rear wheels through the transfer to realize four-wheel drive. It should be noted that in the embodiment, the arrow direction in Figures 1 to 5 is the driving direction of the vehicle.

[0042] Specifically, the transfer 6 includes a third rotating shaft Z3, a fourth rotating shaft Z4, a sixth gear L6, a seventh gear L7, a ninth gear L9 and a tenth gear L10. The third rotating shaft Z3 is coaxially arranged with the first rotating shaft Z1, the sixth gear L6 is fixedly connected to the first rotating shaft Z1, the seventh gear L7 is fixedly connected to the third rotating shaft Z3, the first coaxial device T1 is arranged between the sixth gear L6 and the seventh gear L7, the ninth gear L9 is sleeved on the fourth rotating shaft Z4, the tenth gear L10 is fixedly connected to the fourth rotating shaft Z4, the second coaxial device T2 is arranged between the tenth gear L10 and the ninth gear L9, and the ninth gear L9 is power-coupled with the seventh gear L7. The transmission is high in transmission efficiency and compact in structure.

[0043] In detail, the transfer 6 further comprises a fifth rotating shaft Z5, a fifth gear L5, an eleventh gear L11 and an eighth gear L8, the fifth gear L5 is sleeved on the first rotating shaft Z1, the fifth gear L5, the sixth gear L6 and the seventh gear L7 are arranged in sequence along the axial direction of the first rotating shaft Z1, the first coaxial device T1 comprises a sixth sleeve sleeved on and engaged with the sixth gear L6, a fifth gear engaging spline arranged on the fifth gear L5 and a seventh gear engaging spline arranged on the seventh gear L7, the sixth sleeve is used for being engaged with the fifth gear engaging spline or the seventh gear engaging spline, the eleventh gear L11 and the eighth gear L8 are fixedly connected to the fifth rotating shaft Z5, the eighth gear L8 is engaged with the seventh gear L7 and the ninth gear L9 respectively, and the eleventh gear L11 is engaged with the fifth gear L5. When the sixth sleeve slides along the axial direction of the first rotating shaft Z1 to the seventh gear L7 and is engaged with the seventh gear engaging spline of the seventh gear L7, the first rotating shaft Z1 and the third rotating shaft Z3 rotate coaxially, kinetic energy is sequentially transmitted from the first rotating shaft Z1 to the sixth gear L6, the seventh gear L7 and the third rotating shaft Z3, and then transmitted to the rear axle through the third rotating shaft Z3, at this time, it is two drive, that is, only the rear wheels drive the vehicle to move; the ninth gear L9 and the tenth gear L10 rotate coaxially through the second coaxial device T2, on the basis of two drive, kinetic energy is sequentially transmitted from the seventh gear L7 to the eighth gear L8, the ninth gear L9, the tenth gear L10 and the fourth rotating shaft Z4, and then transmitted to the front axle through the fourth rotating shaft Z4, realizing four-wheel drive function, that is, the four wheels of the vehicle jointly drive the vehicle to move, at this time, it is four-wheel drive high gear; when the sixth sleeve slides along the axial direction of the first rotating shaft Z1 to the fifth gear L5 and is engaged with the fifth gear engaging spline, and the ninth gear L9 and the tenth gear L10 rotate coaxially through the second coaxial device T2, kinetic energy is sequentially transmitted from the first rotating shaft Z1 to the sixth gear L6, the fifth gear L5, the eleventh gear L11, the fifth rotating shaft Z5 and the eighth gear L8, since the eighth gear L8 is engaged with the seventh gear L7 and the ninth gear L9 respectively, kinetic energy can be sequentially transmitted to the seventh gear L7 and the third rotating shaft Z3 through the eighth gear L8, and then transmitted to the rear axle through the third rotating shaft, at the same time, kinetic energy is sequentially transmitted to the ninth gear L9, the tenth gear L10 and the fourth rotating shaft Z4 through the eighth gear L8, and then transmitted to the front axle through the fourth rotating shaft Z4, at this time, it is four-wheel drive low gear. By arranging four-wheel drive high gear and four-wheel drive low gear, the vehicle can adapt to low-speed escape and short-time temporary climbing and the like, the power transmission system increases the coping strategy for temporary conditions, and the driving experience of the driver when driving the vehicle is improved.

[0044] In summary, by sleeving the rotor of the driving motor on the first rotating shaft Z1 and by driving connection with the first rotating shaft Z1 through the transmission gear set, the vehicle can be directly driven at high speed in the mode that the rotating speed output by the engine 1 is not changed through the gearbox and is directly transmitted to the rear axle and / or the front axle of the vehicle, ensuring efficient use of kinetic energy of the engine in the high-speed direct drive mode, while adapting to the limited installation space of the vehicle and reducing the manufacturing cost of the vehicle.

[0045] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the present application should be covered by the claims of the present application.

Claims

1. A power transmission system for a vehicle, characterized in that, include: engine; A first rotating shaft is coaxially arranged with the output shaft of the engine; A drive motor, wherein the rotor of the drive motor is sleeved on the first rotating shaft, and the rotor of the drive motor is connected to the first rotating shaft through a transmission gear set; A transmission connection mechanism is disposed between the engine and the drive motor, and the transmission connection mechanism is used to connect or disconnect the power transmission between the output shaft of the engine and the first rotating shaft; The vehicle is driven by the engine and / or the drive motor.

2. The power transmission system of the vehicle according to claim 1, characterized in that: The rotor of the drive motor is sleeved on the first rotating shaft via a hollow rotor shaft. Two sets of hollow shaft bearings are provided on the hollow rotor shaft. The rotor of the drive motor is positioned between the two sets of hollow shaft bearings. At least two support bearings are sequentially provided along the axial direction of the first rotating shaft.

3. The power transmission system of the vehicle according to claim 2, characterized in that: The first rotating shaft is coaxially arranged with the hollow rotor shaft.

4. The power transmission system of the vehicle according to claim 2, characterized in that: The transmission gear set includes a first gear, a second gear, a third gear, a fourth gear, and a second rotating shaft arranged parallel to the first rotating shaft. The first gear is fixedly connected to the hollow shaft bearing, the fourth gear is fixedly connected to the first rotating shaft, and the second gear and the third gear are sequentially fixedly connected to the second rotating shaft along the axial direction of the second rotating shaft. The first gear meshes with the second gear, and the third gear meshes with the fourth gear.

5. The power transmission system of the vehicle according to claim 4, characterized in that: Three sets of support bearings are sequentially arranged on the first rotating shaft, two of which are respectively arranged on both sides of the fourth gear, and the other set of support bearings is arranged on the side of the drive motor near the transmission connection mechanism.

6. The power transmission system of the vehicle according to any one of claims 1-5, characterized in that: A generator speed-regulating motor is also provided between the engine and the transmission connection mechanism. The rotor of the generator speed-regulating motor is connected to the output shaft of the engine. The output shaft of the engine is used to drive the rotor of the generator speed-regulating motor to rotate. The power transmission system of the vehicle also includes an electronic control system, which is electrically connected to the generator speed-regulating motor and the drive motor respectively.

7. The power transmission system of the vehicle according to claim 6, characterized in that: A vibration damper is also provided between the engine and the generator speed-regulating motor.

8. The power transmission system of the vehicle according to any one of claims 1-5, characterized in that: The drive motor is also provided with a transfer case on the side away from the engine, the transfer case being used to transfer the kinetic energy of the first shaft to the rear axle and / or front axle of the vehicle.

9. The power transmission system of the vehicle according to claim 8, characterized in that: The transfer case includes a third shaft, a fourth shaft, a sixth gear, a seventh gear, a ninth gear, and a tenth gear. The third shaft is coaxial with the first shaft. The sixth gear is fixedly connected to the first shaft. The seventh gear is fixedly connected to the third shaft. A first coaxial coupling is provided between the sixth gear and the seventh gear. The ninth gear is sleeved on the fourth shaft. The tenth gear is fixedly connected to the fourth shaft. A second coaxial coupling is provided between the tenth gear and the ninth gear. The ninth gear and the seventh gear are dynamically coupled together.

10. The power transmission system of the vehicle according to claim 9, characterized in that: The transfer case further includes a fifth rotating shaft, a fifth gear, an eleventh gear, and an eighth gear. The fifth gear is sleeved on the first rotating shaft. The fifth gear, the sixth gear, and the seventh gear are arranged sequentially along the axial direction of the first rotating shaft. The first coaxial device includes a sixth sliding sleeve sleeved on the sixth gear and meshing with the sixth gear, a fifth gear engagement spline provided on the fifth gear, and a seventh gear engagement spline provided on the seventh gear. The sixth sliding sleeve is used to mesh with the engagement spline of the fifth gear or the engagement spline of the seventh gear. The eleventh gear and the eighth gear are fixedly connected to the fifth rotating shaft. The eighth gear meshes with the seventh gear and the ninth gear respectively, and the eleventh gear meshes with the fifth gear.

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