Hybrid power system and vehicle

Abstract

The invention relates to a hybrid power system and a vehicle, the hybrid power system comprises a planetary gear train, the planetary gear train comprises a first transmission part, a second transmission part and a third transmission part, the second transmission part is used for inputting power, and the third transmission part is used for outputting power; the engine is connected with the second transmission part; the driving motor is connected with the second transmission part; the brake is used for locking or unlocking the first transmission part; and the first clutch is used for connecting or disconnecting the first transmission part and the second transmission part or connecting or disconnecting the first transmission part and the third transmission part. In this way, multiple driving modes such as two-gear output of engine power, two-gear output of driving motor power and two-gear output of parallel power of the engine and the driving motor can be achieved, and the economical efficiency and the dynamic property of the vehicle are guaranteed. The hybrid power system is more compact in structure, smaller in occupied space, simpler and easier to arrange.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of power systems, in particular, to a hybrid power system and a vehicle. BACKGROUND

[0002] The hybrid power system includes an engine powered by fuel and a drive motor driven by electricity, and the hybrid power system can drive in combination of the two different powers, and the connection and control between the engine and the drive motor will directly affect the performance of the hybrid vehicle.

[0003] Since the working conditions of the whole vehicle are variable during actual driving, and the driving mode of the existing hybrid power system is relatively single, it is difficult for the vehicle to select a suitable driving mode in different driving scenes, and when the driving conditions are complex, the vehicle is difficult to select the optimal driving mode, which affects the economy and power of the vehicle. SUMMARY

[0004] The purpose of the present disclosure is to provide a hybrid power system and a vehicle to at least partially solve the problems existing in the related art.

[0005] In order to achieve the above-mentioned purpose, the present disclosure provides a hybrid power system, comprising:

[0006] a planetary gear train, comprising a first transmission member, a second transmission member and a third transmission member, wherein the second transmission member is used for inputting power, and the third transmission member is used for outputting power;

[0007] an engine connected with the second transmission member;

[0008] a drive motor connected with the second transmission member;

[0009] a brake used for locking or unlocking the first transmission member; and

[0010] a first clutch used for engaging or disconnecting the first transmission member and the second transmission member, or used for engaging or disconnecting the first transmission member and the third transmission member.

[0011] Optionally, the extension direction of the output shaft of the engine is parallel to the extension direction of the vehicle half shaft.

[0012] Optionally, the hybrid power system further comprises a differential, and the input shaft of the differential is connected with the third transmission member.

[0013] Optionally, the hybrid power system further comprises a second driving gear and a second driven gear capable of engaging with each other, the second driving gear is connected with the third transmission member, and the second driven gear is connected with the power shaft of the differential.

[0014] Optionally, the second driving gear includes a first gear unit coaxially arranged with the third transmission member and a second gear unit coaxially arranged with the second driven gear, the first gear unit has a diameter greater than that of the second gear unit.

[0015] Optionally, the hybrid power system further includes a second clutch for engaging or disengaging the engine and a second transmission member.

[0016] Optionally, the hybrid power system further includes a transmission shaft fixedly connected with the second transmission member, one end of the transmission shaft is drivingly connected to the engine via the second clutch, and the other end of the transmission shaft is connected to the driving motor, the first transmission member and the third transmission member are coaxially sleeved on the transmission shaft.

[0017] Optionally, the hybrid power system further includes a first driving gear and a first driven gear capable of being engaged with each other, the first driving gear is connected with an output shaft of the driving motor, and the first driven gear is connected with the transmission shaft, wherein a transmission ratio between the first driving gear and the first driven gear is greater than a transmission ratio between the engine and the transmission shaft.

[0018] Optionally, the hybrid power system further includes a generator connected with the engine, the generator is configured to be driven by the engine to generate electricity.

[0019] Optionally, the generator is connected with the second transmission member.

[0020] Optionally, a power shaft of the generator is coaxially sleeved on an output shaft of the engine.

[0021] Optionally, the hybrid power system further includes a third driving gear and a third driven gear capable of being engaged with each other, the third driving gear is connected with the output shaft of the engine, and the third driven gear is connected with the power shaft of the generator.

[0022] Optionally, the hybrid power system further includes a box, the planetary gear train, the brake and the first clutch are respectively accommodated in the box, wherein one end of the brake is fixedly connected with the box, and the other end of the brake is selectively connected with the first transmission member.

[0023] Optionally, at least one of the engine and the driving motor is accommodated in the box.

[0024] Optionally, the first transmission member is a sun gear, the second transmission member is a ring gear, and the third transmission member is a planet carrier.

[0025] According to a second aspect of the present disclosure, there is also provided a vehicle comprising the hybrid power system described above.

[0026] By means of the above technical solution, the brake can lock or unlock the first transmission member, and the first clutch can engage any two of the planetary gear set, so that when the second transmission member receives the power transmitted from the engine and the drive motor, the power can be output from the third transmission member in two gears by adjusting the engagement or disconnection among the three of the first transmission member, the second transmission member and the third transmission member. Thus, the hybrid power system of the present disclosure can realize multiple driving modes such as two-gear output of engine power, two-gear output of drive motor power and two-gear output of parallel power of engine and drive motor. When the hybrid power system is applied to a vehicle, the vehicle can select different driving modes according to different driving scenarios, thereby ensuring the economy and power performance of the vehicle. The hybrid power system can realize multiple driving modes by using one planetary gear set, one brake and one clutch, and has a more compact structure and occupies less space, and is simpler and easier to arrange.

[0027] Other features and advantages of the present disclosure will be described in detail in the following detailed description section. BRIEF DESCRIPTION OF DRAWINGS

[0028] The accompanying drawings are included to provide a further understanding of the present disclosure and constitute a part of the specification, and are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation of the present disclosure. In the drawings:

[0029] Figure 1 is a schematic principle diagram of a hybrid power system according to a first embodiment of the present disclosure;

[0030] Figure 2 is a schematic principle diagram of a hybrid power system according to a second embodiment of the present disclosure;

[0031] Figure 3 is a schematic principle diagram of a hybrid power system according to a third embodiment of the present disclosure;

[0032] Figure 4 is a schematic principle diagram of a hybrid power system according to a fourth embodiment of the present disclosure;

[0033] Figure 5 is a schematic principle diagram of a hybrid power system according to a fifth embodiment of the present disclosure;

[0034] Figure 6 is a schematic principle diagram of a hybrid power system according to a sixth embodiment of the present disclosure;

[0035] Figure 7is a schematic principle diagram of a hybrid system according to a seventh embodiment of the present disclosure;

[0036] Figure 8 is a schematic principle diagram of a hybrid system according to an eighth embodiment of the present disclosure;

[0037] Figure 9 is a schematic principle diagram of a hybrid system according to a ninth embodiment of the present disclosure.

[0038] BRIEF DESCRIPTION OF DRAWINGS

[0039] 1 - planetary gear train; 11 - first transmission member; 12 - second transmission member; 13 - third transmission member; 2 - engine; 3 - drive motor; 4 - brake; 51 - first clutch; 52 - second clutch; 6 - transmission shaft; 71 - first driving gear; 72 - first driven gear; 73 - second driving gear; 731 - first gear unit; 732 - second gear unit; 74 - second driven gear; 75 - third driving gear; 76 - third driven gear; 8 - differential; 9 - generator DETAILED DESCRIPTION

[0040] The specific embodiments of the present disclosure will be described in detail hereinafter with reference to the drawings. It should be understood that the specific embodiments described herein are merely intended to explain and illustrate the present disclosure, and are not intended to limit the present disclosure.

[0041] In the present disclosure, unless otherwise stated, "inner" and "outer" are in relation to the self outline of the respective components, and the terms "first", "second", etc. are used for the purpose of distinguishing different components, and do not have sequential or important meanings. In the present disclosure, the following description refers to the drawings, and the same numbers in different drawings represent the same or similar elements unless otherwise indicated.

[0042] Referring to Figures 1 to 9 The present disclosure provides a hybrid system, which can include a planetary gear train 1, an engine 2, a drive motor 3, a brake 4, and a first clutch 51, wherein the planetary gear train 1 includes a first transmission member 11, a second transmission member 12, and a third transmission member 13, wherein the second transmission member 12 is configured to input power, and the third transmission member 13 is configured to output power; the engine 2 is connected to the second transmission member 12; the drive motor 3 is connected to the second transmission member 12; the brake 4 is configured to lock or unlock the first transmission member 11; and the first clutch 51 is configured to engage or disengage the first transmission member 11 and the second transmission member 12, or to engage or disengage the first transmission member 11 and the third transmission member 13.

[0043] By the above technical solution, the brake can lock or unlock the first transmission member, and the first clutch can engage any two of the planetary gear train, so that when the second transmission member receives the power transmitted by the engine and the drive motor, the power can be output from the third transmission member in two gears by adjusting the engagement or disconnection among the three of the first transmission member, the second transmission member and the third transmission member. Thus, the hybrid power system disclosed in the application can realize multiple driving modes such as two-gear output of engine power, two-gear output of drive motor power and two-gear output of parallel power of the engine and the drive motor. When the hybrid power system is applied to a vehicle, the vehicle can select different driving modes according to different driving scenes, thereby ensuring the economy and power performance of the vehicle. The hybrid power system can realize multiple driving modes by using one planetary gear train, one brake and one clutch, has a more compact structure, occupies less space and is simpler and easier to arrange.

[0044] Specifically, in the first gear, the brake 4 brakes the first transmission member 11 and the first clutch 51 is disconnected, so that the first transmission member 11 no longer rotates, and when the second transmission member 12 rotates, it directly drives the third transmission member 13 to rotate, so that the third transmission member 13 can output power. Since there is a certain transmission ratio between the second transmission member 12 and the third transmission member 13, the power output by the third transmission member 13 is different from the power transmitted to the second transmission member 12.

[0045] In the second gear, the brake 4 unlocks the first transmission member 11 and the first clutch 51 is engaged, so that the first clutch 51 engages the first transmission member 11 and the second transmission member 12 or engages the first transmission member 11 and the third transmission member 13. At this time, two of the three transmission members are combined into one through the first clutch 51, and at this time, the entire planetary gear train 1 operates as a whole, the three transmission members rotate in the same direction and have the same speed, and the transmission ratio between the second transmission member 12 and the third transmission member 13 is 1. At this time, the power output by the third transmission member 13 is equivalent to the power transmitted to the second transmission member 12.

[0046] The second transmission member 12 can receive the power transmitted by the engine 2 and the drive motor 3. When only the engine 2 provides power, two-gear output of engine 2 power can be realized. When only the drive motor 3 provides power, two-gear output of drive motor 3 power can be realized. When the drive motor 3 and the engine 2 provide power at the same time, two-gear output of parallel power of the engine 2 and the drive motor 3 can be realized. That is, in the case of having two driving members of the engine 2 and the drive motor 3, the hybrid power system of the application can realize at least six driving modes.

[0047] As an exemplary embodiment of the present disclosure, the extension direction of the output shaft of the engine 2 is parallel to the extension direction of the vehicle half shaft, and the engine is a transverse engine. Because the power transmission distance is short and the directions are consistent, the transmission efficiency is higher. Because the transverse engine occupies less vertical space, the vertical space of the engine compartment can be greatly shortened, thereby bringing more expansion space for the driving space, especially the legroom of the front passengers, which is particularly important for compact cars with limited size.

[0048] In the embodiment of the present disclosure, the hybrid power system can further comprise a differential 8, and the input shaft of the differential 8 is connected with the third transmission member 13. The third transmission member 13 can output power to the differential 8, and then transmit power to the wheels.

[0049] Further, the hybrid power system can further comprise a second driving gear 73 and a second driven gear 74 capable of engaging with each other, the second driving gear 73 is connected with the third transmission member 13, and the second driven gear 74 is connected with the power shaft of the differential 8. By arranging the second driving gear 73 and the second driven gear 74, the rotation speed of the differential 8 can be flexibly adjusted to adapt to the optimal rotation speed range, and is not completely limited by the output rotation speed of the third transmission member 13, thereby improving the stability of power output.

[0050] As an exemplary embodiment of the present disclosure, with reference to Figure 1 、 Figure 3 、 Figure 5 、 Figure 7 、 Figure 9 , the second driving gear 73 can comprise a first gear body 731 and a second gear body 732 arranged coaxially, the first gear body 731 is connected with the third transmission member 13, and the second gear body 732 is engaged with the second driven gear 74, and the diameter of the first gear body 731 is greater than the diameter of the second gear body 732. By arranging the first gear body 731 and the second gear body 732, the differential 8 is arranged staggered with the planetary gear system 1 in the transverse direction, which can save longitudinal space and more flexibly adjust the rotation speed of the second driven gear 74, avoid the gear shaft of the second driving gear 73 interfering with the second transmission member 12, so as to more reasonably utilize the space.

[0051] According to some embodiments, the hybrid power system can further comprise a second clutch 52 for engaging or disengaging the engine 2 and the second transmission member 12. The second clutch 52 can make the power output by the engine 2 transmitted to the second transmission member 12 more smoothly. For example, when the vehicle starts, the power can be output by the engine 2, at this time, the second clutch 52 can be gradually engaged from the disengaged state, the torque transmitted by the second clutch 52 can gradually increase from zero, and the power can be smoothly transmitted to the second transmission member 12, so that the vehicle starts smoothly. And when only the driving motor 3 provides power, the second clutch 52 can disconnect the connection between the engine 2 and the second transmission member 12, and the power transmitted by the driving motor 3 to the second transmission member 12 will not drive the engine 2 to idle, ensuring transmission efficiency.

[0052] In some embodiments, the hybrid power system can further comprise a transmission shaft 6 fixedly connected to the second transmission member 12, one end of the transmission shaft 6 is drivingly connected to the engine 2 via the second clutch 52, and the other end is connected to the driving motor 3, and the first transmission member 11 and the third transmission member 13 are coaxially sleeved on the transmission shaft 6, respectively. In the planetary gear train 1, the drivable members include a sun gear, a ring gear, a plurality of planet gears, and a planet carrier, the planet carrier is connected to the plurality of planet gears at the same time, and the planet carrier and the planet gears need to be connected to each other to rotate at the same time, so the planetary gear train 1 can be generally understood as having three transmission members, i.e. the sun gear, the ring gear, and the planet carrier. The first transmission member 11 can be any one of the sun gear, the ring gear, and the planet carrier, the second transmission member 12 can be any one of the other two except the first transmission member 11, and the third transmission member 13 can be the last one. The power of the engine 2 and the driving motor 3 can be transmitted to the second transmission member 12 through the transmission shaft 6, respectively, and the engine 2 and the driving motor 3 can also drive the transmission shaft 6 at the same time. The engine 2 and the driving motor 3 share a transmission structure, so that the hybrid power system is more compact and occupies less space, and is simpler and easier to arrange. At the same time, in the planetary gear train 1, the first transmission member 11, the second transmission member 12, and the third transmission member 13 are coaxial, which is also more convenient for the arrangement of the transmission shaft 6, and the transmission shaft 6 can be directly arranged in the planetary gear train 1.

[0053] Generally, the rotation speed range of the output shaft of the driving motor 3 is greater than that of the output shaft of the engine 2, and the torque output by the driving motor 3 is greater than that output by the engine 2. In order to ensure that the torque output by the driving motor 3 to the transmission shaft 6 is the same as the torque output by the engine 2 to the transmission shaft 6 when the engine 2 and the driving motor 3 drive the second transmission member 12 simultaneously, the hybrid power system can further comprise a first driving gear 71 and a first driven gear 72 capable of meshing with each other, the first driving gear 71 being connected with the output shaft of the driving motor 3, and the first driven gear 72 being connected with the transmission shaft 6, wherein the transmission ratio between the first driving gear 71 and the first driven gear 72 is greater than the transmission ratio between the engine 2 and the transmission shaft 6. When the transmission ratio between the first driving gear 71 and the first driven gear 72 is appropriate, the torque output by the driving motor 3 to the transmission shaft 6 is the same as the torque output by the engine 2 to the transmission shaft 6, thereby ensuring the stability of the transmission shaft 6. If the torque output by the driving motor 3 to the transmission shaft 6 is not the same as the torque output by the engine 2 to the transmission shaft 6 when the engine 2 and the driving motor 3 drive the second transmission member 12 simultaneously, the transmission shaft 6 will be subjected to torsional stress, resulting in bending deformation of the transmission shaft 6, which affects the strength and stability of the transmission shaft 6. In addition, the transmission shaft 6 will generate torsional vibration, increasing noise and affecting the smooth operation and service life of the hybrid power system.

[0054] According to an example embodiment of the present disclosure, the hybrid power system can further comprise a generator 9 connected with the engine 2, the generator 9 being configured to be driven by the engine 2 to generate electricity. When the engine 2 drives the second transmission member 12, the generator 9 can also be driven to generate electricity simultaneously, and when the engine 2 does not drive the second transmission member 12, the engine 2 can also drive the generator 9 to generate electricity alone. The electricity generated by the generator 9 can be further utilized by other devices, achieving energy recovery and optimizing energy utilization. When the engine 2 drives the generator 9 to generate electricity alone, the second clutch 52 can be disconnected at this time to avoid interference with the transmission shaft 6.

[0055] Further, with reference to Figure 9 , the generator 9 can be connected with the second transmission member 12. At this time, the engine 2 needs to drive the generator 9 to generate electricity while driving the second transmission member 12, and the above arrangement is simple in transmission structure and strong in reliability. The present disclosure does not limit the setting position of the generator 9 and the transmission connection relationship, and as long as the engine 2 drives the generator 9 to rotate to generate electricity, it all belongs to the protection scope of the present disclosure.

[0056] Wherein, with reference to Figure 3 , Figure 4 , Figure 7 , Figure 8In the ninth embodiment shown in FIG. 9, the power shaft of the generator 9 can be coaxially sleeved on the output shaft of the engine 2. In this way, the transmission structure between the generator 9 and the engine 2 is reduced, the maintenance difficulty and the risk of wearing of parts are reduced, and the reliability of the connection is improved.

[0057] In some embodiments, with reference to Figure 1 、 Figure 2 、 Figure 5 、 Figure 6 The hybrid power system can further include a third driving gear 75 and a third driven gear 76 capable of engaging with each other, the third driving gear 75 being connected with the output shaft of the engine 2, and the third driven gear 76 being connected with the power shaft of the generator 9. Through the third driving gear 75 and the third driven gear 76, the rotation speed of the generator 9 can be flexibly adjusted to adapt to the rotation speed range required for optimal power generation efficiency, without being completely limited by the output rotation speed of the engine 2, thereby improving the power generation efficiency and stability.

[0058] In some embodiments, the hybrid power system can further include a box, the planetary gear train 1, the brake 4 and the first clutch 51 being accommodated in the box, wherein one end of the brake 4 is fixedly connected with the box, and the other end is selectively connected with the first transmission member 11. The box can play a role in protecting the planetary gear train 1, the brake 4 and the first clutch 51, and can also be used to fix the brake 4.

[0059] Further, at least one of the engine 2 and the drive motor 3 is accommodated in the box, and in this embodiment, the box can play a role in protecting the engine 2 or the drive motor 3. In other embodiments, the engine 2 and the drive motor 3 can be independent of the box, so as to be maintained separately.

[0060] In Figures 1 to 9 the nine embodiments shown, the first transmission member 11 is a sun gear, the second transmission member 12 is a ring gear, and the third transmission member 13 is a planet carrier, wherein in the first embodiment, the second embodiment, the third embodiment and the fourth embodiment, the first clutch 51 is connected between the planet carrier and the sun gear, and the first clutch 51 is used to engage or disconnect the first transmission member 11 and the third transmission member 13. In the fifth embodiment, the sixth embodiment, the seventh embodiment, the eighth embodiment and the ninth embodiment, the first clutch 51 is connected between the ring gear and the sun gear, and the first clutch 51 is used to engage or disconnect the first transmission member 11 and the second transmission member 12.

[0061] Specifically, in the first gear position, the first clutch 51 is engaged, the second clutch 52 is disengaged, the third clutch 53 is engaged, and the fourth clutch 54 is disengaged. In this way, the first transmission member 11 is connected with the third transmission member 13, and the second transmission member 12 is disconnected from the third transmission member 13. Figures 1 to 9In the nine embodiments shown, the brake 4 locks the sun gear and the first clutch 51 is disconnected, at this time the sun gear no longer rotates, when the ring gear rotates, it directly drives the planet carrier to rotate, and the planet carrier outputs power. When the sum of the teeth of the plurality of planet gears connected to the planet carrier is greater than the number of teeth of the ring gear, the transmission ratio of the ring gear to the planet carrier is greater than 1, at this time the planet carrier rotates at a lower speed than the ring gear, and the power output on the planet carrier is less than the power input to the ring gear. Conversely, when the sum of the teeth of the plurality of planet gears connected to the planet carrier is less than the number of teeth of the ring gear, the transmission ratio of the ring gear to the planet carrier is less than 1, at this time the planet carrier rotates at a higher speed than the ring gear, and the power output on the planet carrier is greater than the power input to the ring gear.

[0062] In the second gear position, the brake 4 unlocks the sun gear and the first clutch 51 is engaged, in the first embodiment, the second embodiment, the third embodiment and the fourth embodiment, the sun gear and the planet carrier are combined as a whole through the first clutch 51, in the fifth embodiment, the sixth embodiment, the seventh embodiment, the eighth embodiment and the ninth embodiment, the ring gear and the planet carrier are combined as a whole through the first clutch 51. At this time, the entire planetary gear train 1 operates as a whole, the sun gear, the planet carrier and the ring gear rotate in the same direction at the same speed, the transmission ratio between the ring gear and the planet carrier is 1, at this time the power output on the planet carrier is equal to the power transmitted to the ring gear.

[0063] In addition to the above nine embodiments, the selection of the first transmission member 11, the second transmission member 12 and the third transmission member 13 can also have various embodiments. For example, the first transmission member 11 is the ring gear, the second transmission member 12 is the sun gear, and the third transmission member 13 is the planet carrier, in this way, by adjusting the relationship between the number of teeth of the plurality of planet gears connected to the planet carrier and the number of teeth of the sun gear, the speed increase and speed reduction of the first gear position relative to the second gear position can be determined. For another example, the first transmission member 11 is the sun gear, the second transmission member 12 is the planet carrier, and the third transmission member 13 is the ring gear, in this way, by adjusting the relationship between the number of teeth of the plurality of planet gears connected to the planet carrier and the number of teeth of the ring gear, the speed increase and speed reduction of the first gear position relative to the second gear position can be determined. It should be noted that the selection of the first transmission member 11, the second transmission member 12 and the third transmission member 13 is not specifically limited in the present disclosure, and can be adaptively selected according to the actual working scene and the structure of the planetary gear train 1.

[0064] According to a second aspect of the present disclosure, a vehicle is also provided, comprising the hybrid power system described above. The vehicle has all the beneficial effects of the hybrid power system described above, which will not be repeated here.

[0065] The preferred embodiments of the present disclosure are described in detail above with reference to the drawings, but the present disclosure is not limited to the specific details in the above-described embodiments. Various simple modifications can be made to the technical solutions of the present disclosure within the technical concept of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

[0066] In addition, it should be noted that each specific technical feature described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, various possible combinations are not described again in the present disclosure.

[0067] In addition, various different embodiments of the present disclosure can also be combined in any appropriate manner, as long as they do not deviate from the idea of the present disclosure, and they should also be considered as disclosed in the present disclosure.

Claims

1. A hybrid power system, characterized in that, include: A planetary gear train, comprising a first transmission component, a second transmission component, and a third transmission component, wherein the second transmission component is used for inputting power, and the third transmission component is used for outputting power; An engine, which is connected to the second transmission component; A drive motor, which is connected to the second transmission component; A brake, used to lock or unlock the first transmission element; and A first clutch is used to engage or disengage the first transmission member and the second transmission member, or to engage or disengage the first transmission member and the third transmission member.

2. The hybrid power system according to claim 1, characterized in that, The output shaft of the engine extends in a direction parallel to the direction of extension of the vehicle's half-shaft.

3. The hybrid power system according to claim 1, characterized in that, The hybrid power system also includes a differential, the input shaft of which is connected to the third transmission component.

4. The hybrid power system according to claim 3, characterized in that, The hybrid power system also includes a second driving gear and a second driven gear that can mesh with each other. The second driving gear is connected to the third transmission component, and the second driven gear is connected to the power shaft of the differential.

5. The hybrid power system according to claim 4, characterized in that, The second driving gear includes a first gear unit and a second gear unit arranged coaxially. The first gear unit is connected to the third transmission member, and the second gear unit meshes with the second driven gear. The diameter of the first gear unit is larger than the diameter of the second gear unit.

6. The hybrid power system according to claim 1, characterized in that, The hybrid system also includes a second clutch for engaging or disengaging the engine and the second transmission.

7. The hybrid power system according to claim 6, characterized in that, The hybrid power system also includes a drive shaft fixedly connected to the second transmission component. One end of the drive shaft is connected to the engine via the second clutch, and the other end is connected to the drive motor. The first transmission component and the third transmission component are coaxially loosely fitted on the drive shaft.

8. The hybrid power system according to claim 7, characterized in that, The hybrid power system further includes a first driving gear and a first driven gear that can mesh with each other. The first driving gear is connected to the output shaft of the drive motor, and the first driven gear is connected to the transmission shaft. The transmission ratio between the first driving gear and the first driven gear is greater than the transmission ratio between the engine and the transmission shaft.

9. The hybrid power system according to claim 1, characterized in that, The hybrid power system also includes a generator connected to the engine, the generator being configured to generate electricity by being driven by the engine.

10. The hybrid power system according to claim 9, characterized in that, The generator is connected to the second transmission component.

11. The hybrid power system according to claim 9, characterized in that, The generator's power shaft is coaxially mounted on the engine's output shaft.

12. The hybrid power system according to claim 9, characterized in that, The hybrid power system also includes a third driving gear and a third driven gear that can mesh with each other. The third driving gear is connected to the output shaft of the engine, and the third driven gear is connected to the power shaft of the generator.

13. The hybrid power system according to claim 1, characterized in that, The hybrid power system also includes a housing, in which the planetary gear train, the brake, and the first clutch are respectively housed. One end of the brake is fixedly connected to the housing, and the other end is selectively connected to the first transmission component.

14. The hybrid power system according to claim 13, characterized in that, At least one of the engine and the drive motor is housed within the housing.

15. The hybrid power system according to any one of claims 1-14, characterized in that, The first transmission component is a sun gear, the second transmission component is a gear ring, and the third transmission component is a planet carrier.

16. A vehicle, characterized in that, Includes the hybrid power system described in any one of claims 1-15.

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