Hybrid power transmission system and vehicle

Abstract

The present invention discloses a hybrid power transmission system and a vehicle, the hybrid power transmission system comprises: an engine, a first motor, a second motor, a clutch, a brake structure and a planetary gear coupling mechanism, the first motor is connected to the engine, the clutch is installed in the first motor, the first motor, the second motor, the first planetary row and the second planetary row are arranged in parallel along the coaxial line in sequence, the first planetary row is connected to the second motor through the first transmission shaft, one side of the second planetary row crosses the first planetary row and the second motor through the second transmission shaft to connect with the clutch and the engine, and the other side of the second planetary row is connected to the output shaft; the first transmission shaft and the second transmission shaft are coaxially sleeved. The above hybrid power transmission system arranges two single planetary rows side by side, simplifies the connection structure of the related elements of the two planetary rows, and the second transmission shaft passes through the inside of the second motor, and the clutch is integrated in the first motor, so the integration is relatively high.

Description

Technical Field

[0001] The present invention relates to the technical field of power transmission, and in particular to a hybrid power transmission system and a vehicle. Background Art

[0002] With the increasing shortage of oil supply and the increasing environmental pollution, the development and utilization of new energy vehicles has gradually become a trend.

[0003] Among them, hybrid vehicles can be driven by the engine or motor, or by the engine and motor at the same time, with multiple driving modes, so that the engine and motor can operate in the high efficiency range as much as possible, with good fuel economy and low emissions. Currently known dual-motor systems usually use two motors and a fixed-axis transmission device, which can achieve engine-driven, pure electric-driven, hybrid-driven and other working modes, but the fixed-axis structure is difficult to arrange dual motors, and the entire transmission device space is relatively large, which is difficult to arrange on the whole vehicle. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is that it is difficult to arrange dual motors in the fixed-axis structure in the prior art, and the space of the entire transmission device is relatively large, which makes it difficult to arrange on the whole vehicle.

[0005] To this end, the present invention provides a hybrid power transmission system, comprising: an engine, a first motor, a second motor, a clutch, a brake structure and a planetary gear coupling mechanism, wherein the first motor is connected to the engine; the planetary gear coupling mechanism comprises a first planetary gear row and a second planetary gear row connected to each other; the brake structure is suitable for braking the first planetary gear row and / or the second planetary gear row;

[0006] Among them, the clutch is installed in the first motor, and the first motor, the second motor, the first planetary row and the second planetary row are arranged side by side along a coaxial line in sequence. The first planetary row is connected to the second motor through a first transmission shaft, and one side of the second planetary row spans the first planetary row and the second motor through a second transmission shaft to be connected to the clutch and the engine, and the other side of the second planetary row is connected to the output shaft; the first transmission shaft and the second transmission shaft are coaxially sleeved.

[0007] Optionally, in the hybrid power transmission system, the first planetary gear comprises: a first sun gear, a first planetary gear, a first planetary carrier and a first ring gear; the first sun gear, the first planetary gear and the first ring gear are meshed for transmission, and the first planetary carrier is connected to the first planetary gear;

[0008] The second planetary gear comprises: a second sun gear, a second planetary gear, a second planet carrier and a second ring gear; the second sun gear, the second planetary gear and the second ring gear are meshed for transmission, and the second planet carrier is connected to the second planetary gear;

[0009] Among them, the second sun gear is connected to the clutch through the second transmission shaft; the first sun gear is connected to the second motor rotor through the first transmission shaft; the first ring gear is fixedly connected to the second planetary carrier, the second ring gear is fixedly connected to the housing of the planetary gear coupling mechanism, and the second planetary carrier is connected to the output shaft.

[0010] Optionally, the hybrid power transmission system further comprises a braking structure, wherein the braking structure comprises:

[0011] A first brake, which is disposed between the first planet carrier and a housing of the planetary gear coupling mechanism and is used to brake the first planetary gear;

[0012] A second brake, wherein the second brake is arranged between the first ring gear and the housing of the planetary gear coupling mechanism and is used for braking the second planetary gear set.

[0013] Optionally, in the above hybrid power transmission system, the first transmission shaft is a hollow shaft, and the second transmission shaft is inserted into the hollow shaft.

[0014] Optionally, in the above hybrid powertrain system, the first motor includes a first stator and a first rotor, the first rotor is disposed in the first stator, and the clutch is integrated in the first rotor.

[0015] Optionally, in the above hybrid powertrain system, the clutch comprises a clutch outer hub and a clutch inner hub, the clutch outer hub is fixedly connected to the first rotor and connected to the engine, and the clutch inner hub is connected to the second transmission shaft.

[0016] Optionally, in the hybrid powertrain system, the first motor and the second motor are adapted to be electrically connected to a vehicle battery, and the hybrid powertrain system has the following working modes:

[0017] Pure electric mode: the clutch is disconnected and the first motor is not working, the second motor is working through the battery, the first brake is closed and the second brake is disconnected, and the second motor drives the output shaft to rotate through the first planetary gear and the second planetary carrier;

[0018] Engine mode: the engine is started and the clutch is engaged, the first brake and the second brake are disconnected, and the second transmission shaft drives the output shaft to rotate through the second planetary gear;

[0019] Hybrid power mode: the engine is started and the clutch is engaged, the first brake is closed and the second brake is disconnected, and the second motor is working; wherein the engine drives the output shaft to rotate through the clutch, the second transmission shaft and the second planetary gear; the second motor drives the first planetary gear through the first transmission shaft and drives the output shaft to rotate through the second planetary carrier.

[0020] Optionally, the hybrid power transmission system further comprises the following working modes:

[0021] Extended-range mode: the engine is started and the clutch is open, the first brake is closed, the second brake is disengaged, the second motor is working, and the second motor drives the first planetary gear and the second planetary carrier to move through the first transmission shaft and then drives the output shaft to rotate; the engine drives the first motor to generate electricity through the clutch to supplement the power of the second motor.

[0022] Optionally, the hybrid powertrain system described above,

[0023] The hybrid powertrain system also includes the following operating modes:

[0024] Energy recovery: the engine is turned off, the first motor is turned off, the clutch is opened, the first brake is closed and the second brake is disconnected, and the output shaft transfers energy to the first planetary row through the second planet carrier and to the second motor through the first transmission shaft, so as to drive the second motor to generate electricity;

[0025] Starter generator: the first motor is started and the clutch is opened, the second motor does not work, and the first motor transmits power to the engine through the clutch;

[0026] Braking: The clutch is disengaged, the first brake is disengaged and the second brake is disengaged, and the second planet carrier does not move.

[0027] A vehicle comprises the hybrid power transmission system mentioned above.

[0028] The technical solution provided by the present invention has the following advantages:

[0029] 1. The hybrid power transmission system provided by the present invention comprises: an engine, a first motor, a second motor, a clutch, a brake structure and a planetary gear coupling mechanism, wherein the first motor is connected to the engine, the planetary gear coupling mechanism comprises a first planetary gear and a second planetary gear arranged side by side; the brake structure is suitable for braking the first planetary gear and / or the second planetary gear; the first planetary gear is respectively connected to the second motor and the output shaft through a first transmission shaft, and the second planetary gear is respectively connected to the output shaft and the engine through a clutch through a second transmission shaft; wherein the clutch is installed in the first motor, and the first transmission shaft and the second transmission shaft are coaxially sleeved. The above hybrid power transmission system, two single planetary gears connected to each other arranged side by side, simplifies the connection structure of the related elements of the two planetary gears, the first transmission shaft and the second transmission shaft are sleeved to each other, and the second transmission shaft passes through the second motor and the first planetary gear, which greatly saves the space size in the radial direction. In addition, the clutch is integrated in the first motor, and the integration is relatively high. The above hybrid power transmission system has high transmission efficiency and compact structure, can reduce vehicle fuel consumption and reduce pollutant emissions, and occupies a small space, and is suitable for the arrangement of longitudinal rear-wheel drive vehicles.

[0030] 2. The hybrid power transmission system provided by the present invention mainly adopts three power split drive modes when the vehicle is traveling in hybrid power mode, and has three hybrid power modes with fixed transmission ratios. It has high adaptability to road conditions and can take into account the fuel economy and power requirements of the whole vehicle. In the three power split drive modes, the whole vehicle can achieve stepless speed change. At this time, the engine speed changes infinitely, and the engine always operates in a high-efficiency range with a narrow speed range. The performance of the engine itself can be guaranteed within the commonly used speed range. The hybrid power system embodied in the present invention is more conducive to the efficient operation of the engine and avoids it from operating in a low-efficiency and high-emission operating range. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 A schematic diagram of the structure of the hybrid power transmission system provided in Example 1 of the present application;

[0033] Figure 2 This is a transmission schematic diagram of the hybrid power transmission system provided in Example 1 of the present application in pure electric mode;

[0034] Figure 3 A transmission schematic diagram of the hybrid power transmission system provided in Example 1 of the present application in the engine mode;

[0035] Figure 4 A transmission schematic diagram of the hybrid power transmission system provided in Example 1 of the present application in a hybrid power mode;

[0036] Figure 5 This is a transmission schematic diagram of the hybrid power transmission system provided in Example 1 of the present application in the extended range mode;

[0037] Description of reference numerals:

[0038] 10-Engine;

[0039] 21-clutch outer hub; 22-clutch inner hub;

[0040] 30-first motor; 31-first stator; 32-first rotor;

[0041] 40 - second motor; 41 - second stator; 42 - second rotor;

[0042] 50-first transmission shaft; 60-second transmission shaft; 70-output shaft; 80-crankshaft;

[0043] B1-first brake; B2-second brake;

[0044] PG1-first planetary gear; S1-first sun gear; P1-first planetary gear; PC1-first planet carrier; R1-first ring gear;

[0045] PG2-second planetary gear; S2-second sun gear; P2-second planetary gear; PC2-second planet carrier; R2-second ring gear. DETAILED DESCRIPTION

[0046] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0048] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0050] Example 1

[0051] This embodiment provides a hybrid power transmission system, such as Figure 1 As shown, it includes: an engine 10, a first motor 30, a second motor 40, a clutch, a braking structure and a planetary gear coupling mechanism, the first motor 30 is connected to the engine 10, the planetary gear coupling mechanism includes a first planetary row PG1 and a second planetary row PG2 connected to each other; the braking structure is suitable for braking the first planetary row PG1 and the second planetary row PG2; the clutch is installed in the first motor 30, the first motor 30, the second motor 40, PG1 and the second planetary row PG2 are arranged side by side along the coaxial line in sequence, the first planetary row PG1 is connected to the second motor 40 through the first transmission shaft 50, one side of the second planetary row PG2 crosses the first planetary row PG1 and the second motor 40 through the second transmission shaft 60 to be connected to the clutch and the engine 10, and the other side of the second planetary row PG2 is connected to the output shaft 70; the first transmission shaft 50 and the second transmission shaft 60 are coaxially sleeved.

[0052] The hybrid power transmission system provided in this embodiment arranges two single planetary gears side by side, which simplifies the connection structure of the related elements of the two planetary gears. At the same time, the second transmission shaft 60 is connected to the engine 10 by the second planetary gear PG1 passing through the second motor 40 and the first planetary gear PG1. At the same time, the first motor 30, the second motor 40, the first planetary gear PG1 and the second planetary gear PG2 are arranged side by side along the same axis in sequence, and all four extend along the same axis, which greatly reduces the size in the radial direction. At the same time, the clutch is integrated into the first motor 30, with a relatively high degree of integration, which further reduces the size in the radial direction. Therefore, the hybrid power transmission system provided above has high transmission efficiency and compact structure, can reduce vehicle fuel consumption and pollutant emissions, and occupies a small space, and is suitable for the layout of longitudinal rear-wheel drive vehicles.

[0053] Specifically in this embodiment, the first transmission shaft 50 is a hollow shaft, and the second transmission shaft 60 is inserted into the hollow shaft. The first transmission shaft 50 and the second transmission shaft are coaxially arranged, thereby improving the integration of the hybrid transmission system.

[0054] The hybrid powertrain system provided in this embodiment includes a first planetary gear PG1 including a first sun gear S1, a first planetary gear P1, a first planetary carrier PC1 and a first ring gear R1; wherein the first sun gear S1, the first planetary gear P1 and the first ring gear R1 are meshed for transmission, and the first planetary carrier PC1 is connected to the first planetary gear P1;

[0055] Similarly, the second planetary gear PG2 includes: a second sun gear S2, a second planetary gear P2, a second planet carrier PC2 and a second ring gear R2; wherein the second sun gear S2, the second planetary gear P2 and the second ring gear R2 are engaged for transmission, and the second planet carrier PC2 is connected to the second planetary gear P2; the second sun gear S2 is connected to the clutch through the second transmission shaft 60; the first sun gear S1 is connected to the second rotor 42 of the second motor 40 through the first transmission shaft 50; the first ring gear R1 is fixedly connected to the second planet carrier PC2, the second ring gear R2 is fixedly connected to the housing of the planetary gear coupling mechanism, and the second planet carrier PC2 is connected to the output shaft 70.

[0056] The hybrid power transmission system provided in this embodiment also includes a braking structure, which includes: a first brake B1 and a second brake B2, the first brake B1 is used to brake the first planetary gear PG1; the second brake B2 is used to brake the second planetary gear PG2; wherein the first brake B1 is arranged between the first planetary carrier PC1 and the housing of the planetary gear coupling mechanism; the second brake B2 is arranged between the first ring gear R1 and the housing of the planetary gear coupling mechanism.

[0057] When the first brake B1 is disconnected, the first planet carrier is not connected to the housing. At this time, if the first sun gear rotates, the first planet gear, the first planet carrier and the first ring gear may all rotate. Among them, whether the first ring gear rotates or not depends on whether the second brake is applied. When the first brake B1 is closed, the first planet carrier is connected to the housing. At this time, the first planet carrier does not move. If the first sun gear rotates at this time, in the first case, the first planet gear will also rotate and drive the first ring gear to rotate. In the second case, if the first ring gear is braked, the force on the second sun gear will not be able to drive the planet gear to rotate. Usually in the second case, in order to protect the planetary gear, there will be no driving force to drive the first sun gear.

[0058] When the second brake B2 is closed, the first ring gear R1 is fixedly connected to the housing, and the second planetary carrier connected to the first ring gear is also fixedly connected to the housing, and then stops rotating. At this time, the output shaft 70 stops moving; and when the second brake B2 is disconnected, the first ring gear is not fixedly connected to the housing, but is only fixedly connected to the second planetary carrier. That is, at this time, if the first ring gear rotates, the second planetary carrier will move with it, and at the same time, will drive the output shaft 70 to rotate.

[0059] In the hybrid power transmission system provided in this embodiment, the first motor 30 includes a first stator 31 and a first rotor 32, the first rotor 32 is arranged in the first stator 31, and the clutch is integrated in the first rotor 32. In the hybrid power transmission system provided in this embodiment, the clutch includes a clutch outer hub 21 and a clutch inner hub 22, the clutch outer hub 21 is fixedly connected to the first rotor 32 and connected to the crankshaft 80 of the engine 10, and the clutch inner hub 22 is connected to the second transmission shaft 60. The combination of the clutch and the engine 10 can realize the transmission of the power of the engine on the second transmission shaft 60, and the separation of the clutch and the engine 10 can realize the terminal of the power of the engine on the second transmission shaft 60. Among them, the combination or separation of the clutch and the engine 10 depends on whether the clutch inner hub 22 and the clutch outer hub 21 are combined or separated.

[0060] In the hybrid power transmission system provided in this embodiment, the first motor 30 and the second motor 40 are adapted to be electrically connected to the vehicle battery, and the hybrid power transmission device has the following working modes:

[0061] Pure electric mode: Figure 2As shown, the clutch is disconnected and the first motor 30 is not working, the second motor 40 is working through the battery, the first brake B1 is closed and the second brake B2 is disconnected, at this time, the first planetary carrier PC1 is fixedly connected to the case and remains stationary, the first ring gear R1 and the second planetary carrier PC2 are connected and are not fixedly connected to the case; in this process, the second motor 40 transmits power through the first transmission shaft 50, and drives the first sun gear S1, the second planetary gear P1 and the first ring gear R1 of the first planetary row PG1 to rotate, and the second planetary carrier PC2 drives the output shaft 70 to rotate, thereby realizing power output in pure electric mode.

[0062] Engine Mode: Figure 3 As shown, the engine 10 is started and the clutch inner hub 22 and the clutch outer hub 21 are coupled to each other, the first brake B1 and the second brake B2 are disconnected, and the power of the engine is transmitted to the clutch outer hub 21 and the clutch inner hub 22 via the crankshaft 80 of the engine 10. Then, the power is transmitted along the second transmission shaft 60 through the second sun gear S2 and the second planetary gear P2 of the second planetary gear PG2, thereby driving the second planet carrier PC2 to rotate, and then driving the output shaft 70 to rotate; at this point, the power output in the engine mode is realized.

[0063] Hybrid mode: Figure 4 As shown, the engine 10 is started and the clutch is engaged, the first brake B1 is closed and the second brake B2 is disconnected, and the second motor 40 is working; at this time, the first planet carrier PC1 is fixedly connected to the housing and remains stationary, and the first ring gear R1 is connected to the second planet carrier PC2 and is not fixedly connected to the housing. In this process, on the one hand, the power of the engine 10 is transmitted to the clutch outer hub 21 and the clutch inner hub 22 via the engine crankshaft 80, and then the power passes through the second sun gear S2 and the second planet gear P2 of the second planet row PG2 along the second transmission shaft 60, thereby driving the second planet carrier PC2 to rotate, and then driving the output shaft 70 to rotate; on the other hand, the second motor 40 transmits the power through the first transmission shaft 50, and drives the first sun gear S1, the second planet gear P1 and the first ring gear R1 of the first planet row PG1 to rotate, and the second planet carrier PC2 drives the output shaft 70 to rotate. At this point, the power output in the hybrid mode is realized.

[0064] Extended range mode: Figure 5As shown, the engine 10 is started and the clutch is opened, the first brake B1 is closed, the second brake B2 is disconnected, and the second motor 40 is working; at this time, the first planetary carrier PC1 is stationary, and the second planetary carrier PC2 is connected to the first ring gear R1; in this process, the second motor 40 outputs power through the first transmission shaft 50, and drives the first sun gear S1, the second planetary gear P1 and the first ring gear R1 of the first planetary row PG1 to rotate, and the second planetary carrier PC2 drives the output shaft 70 to rotate; and the engine 10 is connected to the clutch outer hub 21 and thereby drives the first rotor 32 to rotate, so that the first motor 30 generates electricity to supplement the power of the second motor 40.

[0065] Energy recovery: the engine 10 is turned off, the first motor 30 is turned off and the clutch is opened, the first brake B1 is closed and the second brake B2 is disconnected, wherein the first planetary carrier PC1 is fixedly connected to the housing, and the second planetary carrier PC2 is fixedly connected to the first ring gear R1. During this process, the output shaft 70 transfers the wheel side energy during braking and sliding to the first ring gear R1 of the first planetary row PG1 through the second planetary carrier PC2, and then transfers it to the first planetary gear P1 and the first sun gear S1. Then, the power will be transferred to the second rotor 42 of the second motor 40 through the first transmission shaft 50 connected to the first sun gear S1, thereby driving the second rotor 42 to rotate to drive the second motor 40 to generate electricity; at this point, the energy recovery process is completed.

[0066] Starting the generator: the first motor 30 is started and the clutch is opened, and the second motor 40 does not work; during this process, the first motor 30 transmits power to the crankshaft 80 through the clutch outer hub 21, and then to the engine 10, so as to start the engine 10.

[0067] Braking: The clutch is disengaged, the first brake B1 is disengaged and the second brake B2 is disengaged. At this time, the first planet carrier PC1 is fixedly connected to the housing, and the first ring gear R1 is fixedly connected to the housing. At this time, the second planet carrier PC2 fixedly connected to the first ring gear R1 does not move, so that the output shaft 70 is braked, thereby achieving the purpose of braking the entire vehicle.

[0068] The hybrid power transmission system provided in the present embodiment mainly adopts three power split driving modes when the vehicle is traveling in hybrid power mode, and has three hybrid power modes with fixed transmission ratios. It has high adaptability to road conditions and can take into account the fuel economy and power requirements of the whole vehicle. In the three power split driving modes, the whole vehicle can achieve stepless speed change. At this time, the speed of the engine 10 changes infinitely, and the engine 10 always works in a high-efficiency range with a narrow speed range. The performance of the engine 10 itself can be guaranteed within the commonly used speed range. The hybrid power system used in the present invention is more conducive to the efficient operation of the engine 10 and avoids it working in a low-efficiency and high-emission operating range.

[0069] Example 2

[0070] This embodiment provides a vehicle, including the hybrid powertrain system provided in Embodiment 1.

[0071] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A hybrid powertrain system, It is characterized in that Applicable to a longitudinal rear-wheel drive vehicle, the hybrid powertrain system comprises: an engine, a first motor, a second motor, a clutch, a brake structure and a planetary gear coupling mechanism, wherein the first motor is connected to the engine; the planetary gear coupling mechanism comprises a first planetary gear row and a second planetary gear row connected to each other; the brake structure is suitable for braking the first planetary gear row and / or the second planetary gear row; The clutch is installed in the first motor, the first motor, the second motor, the first planetary gear and the second planetary gear are sequentially arranged side by side along a coaxial line, the first planetary gear is connected to the second motor through a first transmission shaft, one side of the second planetary gear spans the first planetary gear and the second motor through a second transmission shaft to be connected to the clutch and the engine, and the other side of the second planetary gear is connected to the output shaft; the first transmission shaft and the second transmission shaft are coaxially sleeved; The first planetary gear comprises: a first sun gear, a first planetary gear, a first planet carrier and a first ring gear; the first sun gear, the first planetary gear and the first ring gear are meshed and driven, and the first planet carrier is connected to the first planetary gear; The second planetary gear comprises: a second sun gear, a second planetary gear, a second planet carrier and a second ring gear; the second sun gear, the second planetary gear and the second ring gear are meshed for transmission, and the second planet carrier is connected to the second planetary gear; Among them, the second sun gear is connected to the clutch through the second transmission shaft; the first sun gear is connected to the second motor rotor through the first transmission shaft; the first ring gear is fixedly connected to the second planetary carrier, the second ring gear is fixedly connected to the housing of the planetary gear coupling mechanism, and the second planetary carrier is connected to the output shaft.

2. The hybrid powertrain system according to claim 1, It is characterized in that It also includes a braking structure, which includes: a first brake, which is arranged between the first planet carrier and the housing of the planetary gear coupling mechanism and is used to brake the first planetary gear; A second brake, wherein the second brake is arranged between the first ring gear and the housing of the planetary gear coupling mechanism, and is used for braking the second planetary gear.

3. The hybrid powertrain system according to claim 1, It is characterized in that The first transmission shaft is a hollow shaft, and the second transmission shaft is inserted into the hollow shaft.

4. The hybrid powertrain system according to claim 1, It is characterized in that The first motor includes a first stator and a first rotor, the first rotor is disposed in the first stator, and the clutch is integrated in the first rotor.

5. The hybrid powertrain system according to claim 4, It is characterized in that The clutch comprises a clutch outer hub and a clutch inner hub, wherein the clutch outer hub is fixedly connected to the first rotor and connected to the engine, and the clutch inner hub is connected to the second transmission shaft.

6. The hybrid powertrain system according to claim 2, It is characterized in that The first motor and the second motor are adapted to be electrically connected to a vehicle battery, and the hybrid powertrain system has the following working modes: Pure electric mode: the clutch is disconnected and the first motor is not working, the second motor is working through the battery, the first brake is closed and the second brake is disconnected, and the second motor drives the output shaft to rotate through the first planetary gear and the second planetary carrier; Engine mode: the engine is started and the clutch is engaged, the first brake and the second brake are disconnected, and the second transmission shaft drives the output shaft to rotate through the second planetary gear; Hybrid power mode: the engine is started and the clutch is engaged, the first brake is closed and the second brake is disconnected, and the second motor is working; wherein the engine drives the output shaft to rotate through the clutch, the second transmission shaft and the second planetary gear; the second motor drives the first planetary gear through the first transmission shaft and drives the output shaft to rotate through the second planetary carrier.

7. The hybrid powertrain system according to claim 6, It is characterized in that The hybrid powertrain system also includes the following operating modes: Extended-range mode: the engine is started and the clutch is open, the first brake is closed, the second brake is disengaged, the second motor is working, and the second motor drives the first planetary gear and the second planetary carrier to move through the first transmission shaft and then drives the output shaft to rotate; the engine drives the first motor to generate electricity through the clutch to supplement the power of the second motor.

8. The hybrid powertrain system according to claim 6, It is characterized in that The hybrid powertrain system also includes the following operating modes: Energy recovery: the engine is turned off, the first motor is turned off, the clutch is opened, the first brake is closed and the second brake is disconnected, and the output shaft transfers energy to the first planetary row through the second planet carrier and to the second motor through the first transmission shaft, so as to drive the second motor to generate electricity; Starter generator: the first motor is started and the clutch is opened, the second motor does not work, and the first motor transmits power to the engine through the clutch; Braking: The clutch is disengaged, the first brake is disengaged and the second brake is disengaged, and the second planet carrier does not move.

9. A vehicle, It is characterized in that A hybrid powertrain system comprising the hybrid powertrain system of any one of claims 1-8.

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