CN104960414B - Power transmission system and vehicle having same - Google Patents

Abstract

The invention discloses a power transmission system and a vehicle having the power transmission system. The power transmission system comprises a shell, a drive motor, an input shaft, a first clutch, a second clutch, a first planetary gear mechanism, a second planet gear mechanism, an output gear, a main reducer, a differential and a hydraulic control system. The input shaft is connected to the drive motor, the first clutch and the second clutch are arranged on the input shaft, the first clutch is selectively connected with a first sun gear of the first planetary gear mechanism, the second clutch is selectively connected with a second planetary frame of the second planetary gear mechanism, a first planetary frame is fixedly connected with the output gear, a second gear ring is fixedly connected with the first planetary frame, the first sun gear is fixedly connected with a second sun gear, and the hydraulic control system is used for controlling the first clutch and the second clutch to be connected and disconnected. According to the power transmission system, the highly effective range of the drive motor can be effectively used, and the climbing speed is fast.

Description

Powertrain and vehicle having same

technical field

The invention relates to the field of vehicles, in particular to a power transmission system and a vehicle with the power transmission system.

Background technique

In related technologies, there are many forms of power transmission systems for pure electric vehicles. Among them, it mainly adopts the power transmission system matching the motor and single-stage reducer and the power transmission system matching the motor and multi-speed automatic transmission, and some adopts the power transmission system matching motor and single-planetary two-speed automatic transmission.

The power transmission system equipped with a motor and a single-stage reducer has high requirements on the motor in order to meet the conditions of climbing and high-speed driving, and there are fewer opportunities for the motor to work in the high-efficiency range, resulting in low efficiency of the power transmission system. The power transmission system matched with the motor and the mechanical automatic transmission overcomes the shortcomings of the single-stage reducer. However, since the mechanical automatic transmission mostly adopts a parallel shaft structure, the mass and volume are large, which is not conducive to the realization of light weight and affects the electric drive. The mileage of the car. Moreover, when the mechanical automatic transmission shifts gears, there is a power interruption, the shifting impact is relatively large, and the comfort is poor. The scheme of single planetary two-speed automatic transmission generally uses a wet clutch as a shift element, which has low transmission efficiency, and the range of single planetary gear ratio is small and poor adaptability. Spline connection or flange connection is generally used between the pure electric vehicle motor and single-stage reduction device or mechanical automatic transmission, which brings certain difficulties to processing and assembly, and the cost is correspondingly high.

Contents of the invention

The present invention aims to solve one of the technical problems in the related art at least to a certain extent. For this reason, the present invention proposes a power transmission system, which can effectively utilize the high-efficiency range of the driving motor, and has fast acceleration when climbing.

The invention further proposes a vehicle.

According to the power transmission system of the present invention, it includes: a casing; a driving motor, the driving motor is arranged in the casing and has a motor shaft; an input shaft, the input shaft is connected with the motor shaft; a first clutch, The first clutch includes a first driving disc and a first driven disc, the first driving disc is fixedly connected to the input shaft, and the first driven disc is provided on the input shaft with an empty sleeve, so The first driving disc selectively engages and disconnects the first driven disc; the second clutch includes a second driving disc and a second driven disc, and the second driving disc is fixedly connected to On the input shaft, the second driven disc is provided with an empty sleeve on the input shaft, and the second driving disc selectively engages and disconnects the second driven disc; the first planetary gear mechanism, The first planetary gear mechanism includes: a first sun gear, a first planet gear, a first planet carrier and a first ring gear, the first sun gear is fixedly connected with the first driven plate, and the first The planetary gears are sleeved on the first planetary carrier and respectively meshed with the first ring gear and the first sun gear, and the first ring gear is fixedly connected with the housing; the second planetary gear mechanism, The second planetary gear mechanism includes: a second sun gear, a second planet gear, a second planet carrier and a second ring gear, the second sun gear is fixedly connected to the first sun gear, and the second planet The wheel sleeve is set on the second planet carrier and meshes with the second sun gear and the second ring gear respectively, the second ring gear is fixedly connected with the first planet carrier, and the second planet The carrier is fixedly connected with the second driven plate; the output gear is fixedly connected with the first planetary carrier; the final reducer is provided with a final reducer gear, and the final reducer The gear meshes with the output gear; the differential, the differential is connected with the final drive; the hydraulic control system, the hydraulic control system includes: an oil tank; the filter assembly, the filter assembly connected with the oil tank; an oil pump, the oil pump is connected with the filter assembly, and the oil pump is provided with an oil pump motor; a one-way valve, the one-way valve is connected with the oil pump; a first control valve, The first control valve is connected with the one-way valve; a first hydraulic cylinder, the first hydraulic cylinder is provided with a first piston and is connected with the first control valve so that the first control valve controls the The first piston moves; the first shift fork is connected between the first piston and the first driving plate to control the engagement of the first driving plate and the first driven plate and disconnect; the second control valve, the second control valve is connected with the one-way valve; the second hydraulic cylinder, the second hydraulic cylinder is provided with a second piston and is connected with the second control valve so that The second control valve controls the movement of the second piston; the second shift fork is connected between the second piston and the second driving disc to control the second driving disc and the second driving disc. engagement and disengagement of the second driven disc; an accumulator connected in common between the one-way valve and the first control valve and the one-way valve and the second control valve On the connecting pipeline; the control unit, the control unit is connected with the first control valve and the The second control valve is connected to control the opening and closing state of the first control valve and the opening and closing state of the second control valve.

According to the power transmission system of the present invention, there are two gears, which can effectively utilize the high-efficiency range of the drive motor, accelerate acceleration on hills, and the power transmission system has a compact structure, light weight, and small volume, and the power is consistent during the gear shifting process. In addition, the power transmission system adopts the first planetary gear mechanism and the second planetary gear mechanism with various structural forms, and different speed ratios can be designed according to the needs to meet the design requirements of different vehicles.

In addition, the power transmission system according to the present invention may also have the following additional technical features:

In some examples of the present invention, the first sun gear, the second sun gear and the first driven plate are coaxially arranged.

In some examples of the present invention, the first sun gear, the second sun gear and the first driven plate are integrally formed.

In some examples of the present invention, the first clutch is a dog clutch, and the second clutch is a dry clutch.

In some examples of the present invention, the first clutch is disposed adjacent to the first planetary gear mechanism, the second clutch is disposed between the second planetary gear mechanism and the driving motor, and the second active A disk is disposed adjacent to the drive motor.

In some examples of the present invention, the filter assembly includes a first filter and a second filter, the first filter is connected between the oil tank and the oil pump, and the second A filter is connected between the oil pump and the check valve.

In some examples of the present invention, the input shaft is a solid shaft, and the first sun gear, the second sun gear and the first driven disk together form a hollow shaft and are hollowly sleeved on the input shaft .

In some examples of the present invention, the first control valve and the second control valve are solenoid valves.

In some examples of the present invention, the first clutch, the second clutch, the first planetary gear mechanism, the second planetary gear mechanism, the drive motor and the final reducer are integrated in the inside the shell.

A vehicle according to the present invention includes the above-mentioned power transmission system. The vehicle with the above-mentioned power transmission system has high efficiency, fast climbing acceleration, compact structure, and can also realize the lightweight of the vehicle, and the power is consistent during the gear shifting process, and the speed ratio can be designed according to requirements.

Additional aspects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and comprehensible from the description of the embodiments in conjunction with the following drawings, wherein:

Fig. 1 is a schematic structural view of a power transmission system according to an embodiment of the present invention;

FIG. 2 is a power transmission route diagram of the first gear of the power transmission system according to an embodiment of the present invention;

Fig. 3 is a power transmission route diagram of the second gear of the power transmission system according to the embodiment of the present invention.

Reference signs:

powertrain 100;

Oil tank 1; first filter 2; oil pump motor 3; oil pump 4; second filter 5; one-way valve 6; accumulator 7; first control valve 8; control unit 9; first hydraulic cylinder 10; First shift fork 11; first ring gear 12; first planetary gear 13; first driving disc 14; first driven disc 15; input shaft 16; first sun gear 17; output gear 18; final reducer gear 19 Housing 20; first planet carrier 21; axle shaft 22; differential 23; first planetary gear mechanism 24; second ring gear 25; second planetary gear 26; second planet carrier 27; second driven disc 28; second driving disc 29; drive motor 30; second shift fork 31; second hydraulic cylinder 32; second control valve 33; second sun gear 34; second planetary gear mechanism 35; filter assembly 36; A clutch 37; a second clutch 38; a hydraulic control system 40.

detailed description

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Orientation indicated by rear, left, right, vertical, horizontal, top, bottom, inside, outside, clockwise, counterclockwise, etc. The positional relationship is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, Therefore, it should not be construed as limiting the invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connection, or integral connection; it may be mechanical connection or electrical connection; it may be direct connection or indirect connection through an intermediary, and it may be the internal communication of two elements or the interaction relationship between two elements. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In the present invention, unless otherwise clearly specified and limited, a first feature being "on" or "under" a second feature may include direct contact between the first and second features, and may also include the first and second features Not in direct contact but through another characteristic contact between them. Moreover, "above", "above" and "above" the first feature on the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. "Below", "beneath" and "under" the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

A power transmission system 100 according to an embodiment of the present invention will be described below with reference to FIGS. 1-3 . The power transmission system 100 according to the embodiment of the present invention can be applied to a vehicle (such as an electric vehicle).

As shown in FIG. 1, a power transmission system 100 according to an embodiment of the present invention may include: a housing 20, a drive motor 30, an input shaft 16, a first clutch 37, a second clutch 38, a first planetary gear mechanism 24, a second Planetary gear mechanism 35 , output gear 18 , final drive, differential 23 and hydraulic control system 40 .

The driving motor 30 is arranged in the casing 20, and the driving motor 30 is provided with a motor shaft, and the input shaft 16 is connected with the motor shaft, so that the driving motor 30 can drive the input shaft 16 to rotate to output power. The first clutch 37 includes a first driving disc 14 and a first driven disc 15, the first driving disc 14 is fixedly connected on the input shaft 16, the first driven disc 15 is set on the input shaft 16 in a hollow sleeve, and the first driving disc 14 selectively engages and disengages the first driven plate 15 . The first planetary gear mechanism 24 includes: the first sun gear 17, the first planet gear 13, the first planet carrier 21 and the first ring gear 12, the first sun gear 17 is fixedly connected with the first driven disc 15, and the first planet The wheel 13 is sheathed on the first planet carrier 21 , and the first planetary gear 13 meshes with the first ring gear 12 and the first sun gear 17 respectively, and the first ring gear 12 is fixedly connected with the casing 20 . Since the first driving disc 14 is fixedly connected to the input shaft 16, and the first sun gear 17 is fixedly connected to the first driven disc 15, when the first driving disc 14 and the first driven disc 15 are engaged, the input shaft 16 can The power output by the driving motor 30 is transmitted to the first sun gear 17 , and the first sun gear 17 serves as the power input end of the first planetary gear mechanism 24 . Since the first ring gear 12 is fixedly connected to the housing 20 , the first planet carrier 21 serves as a power output end of the first planetary gear mechanism 24 . The output gear 18 is fixedly connected with the first planet carrier 21, and the first planet carrier 21 can transmit the power of the driving motor 30 to the output gear 18 to drive the vehicle to move. Optionally, the first clutch 37 may be a jaw clutch.

As shown in Figure 1, the second driving disc 29 is fixedly connected on the input shaft 16, the second driven disc 28 is set on the input shaft 16 in a hollow sleeve, and the second driving disc 29 selectively engages and disconnects the second driven disc. Disk 28. Optionally, the second clutch 38 may be a dry clutch. The second planetary gear mechanism 35 includes: the second sun gear 34, the second planet gear 26, the second planet carrier 27 and the second ring gear 25, the second sun gear 34 is fixedly connected with the first sun gear 17, and the second planet gear 26 is sleeved on the second planet carrier 27, and the second planet gear 26 meshes with the second sun gear 34 and the second ring gear 25 respectively, the second ring gear 25 is fixedly connected with the first planet carrier 21, and the second planet carrier 27 is fixedly connected with the second driven plate 28. It can be understood that when the second clutch 38 is engaged and the first clutch 37 is disengaged, the second planet carrier 27 serves as the power input end of the second planetary gear mechanism 35 , and the second ring gear 25 serves as the power input end of the second planetary gear mechanism 35 . At the power output end, since the first planet carrier 21 is connected between the output gear 18 and the second ring gear 25, the second ring gear 25 can transmit power to the output gear 18 to drive the vehicle. Optionally, as shown in Figure 1, the first clutch 37 can be arranged adjacent to the first planetary gear mechanism 24, the second clutch 38 can be arranged between the second planetary gear mechanism 35 and the driving motor 30, and the second driving disc 29 is adjacent to The drive motor 30 is provided so that the power transmission system 100 can be reasonably arranged, compact in structure and stable in transmission.

Optionally, as shown in FIG. 1 , the first sun gear 17 , the second sun gear 34 and the first driven plate 15 can be coaxially arranged, so that the power transmission system 100 can be compact in structure and reduce space occupation. Optionally, the first sun gear 17, the second sun gear 34, and the first driven plate 15 can be integrally formed, so that the overall performance of the first sun gear 17, the second sun gear 34, and the first driven plate 15 can be improved. The structural strength can further prolong the service life of the power transmission system 100 . Optionally, as shown in Figure 1, the input shaft 16 can be a solid shaft, the first sun gear 17, the second sun gear 34 and the first driven disc 15 together form a hollow shaft, and the first sun gear 17, the second The sun gear 34 and the first driven disc 15 are sleeved on the input shaft 16 .

As shown in FIGS. 1-3 , the final reducer is provided with a final reducer gear 19 , the final reducer gear 19 meshes with the output gear 18 , and the differential 23 is connected with the final reducer. It can be understood that the output gear 18 can be transmitted to the final drive through the final drive gear 19 , and the final drive can further transmit power to the differential 23 to drive the vehicle to move.

Optionally, the first clutch 37, the second clutch 38, the first planetary gear mechanism 24, the second planetary gear mechanism 35, the drive motor 30 and the final reducer can be integrated in the casing 20, so that the power transmission can be further saved. The space of the system 100 can be reduced, and the arrangement of installation structures (such as installation flanges, nuts and screws) can be reduced, and the manufacturing cost and difficulty of manufacturing can be reduced.

As shown in Figure 1, the hydraulic control system 40 includes: a fuel tank 1, a filter assembly 36, an oil pump 4, a one-way valve 6, a first control valve 8, a first hydraulic cylinder 10, a first shift fork 11, a second control Valve 33 , second hydraulic cylinder 32 , second shift fork 31 , accumulator 7 and control unit 9 . The filter assembly 36 is connected with the oil tank 1 , the oil pump 4 is connected with the filter assembly 36 , and the oil pump 4 is provided with an oil pump motor 3 , and the check valve 6 is connected with the oil pump 4 . By setting the filter assembly 36, the function of filtering oil can be played. Specifically, as shown in FIG. 1, the filter assembly 36 may include a first filter 2 and a second filter 5, the first filter 2 is connected between the oil tank 1 and the oil pump 4, and the second filter The device 5 is connected between the oil pump 4 and the one-way valve 6. It should be noted that the hydraulic control system 40 can selectively turn on and turn off the oil pump motor 3 according to the needs of hydraulic control so as to reduce fuel consumption. In addition, the oil pump of the existing vehicle is driven by the engine, but the drive motor has no idle state, and the hydraulic control system cannot work when the electric vehicle starts. Therefore, the power transmission system 100 according to the embodiment of the present invention can drive the oil pump 4 through the oil pump motor 3, thereby The above disadvantages can be overcome. It should be noted that the accumulator 7 can convert the energy in the hydraulic control system 40 into compression energy or potential energy and store it at an appropriate time, and convert the compression energy or potential energy into hydraulic pressure when the hydraulic control system 40 needs it. Energy such as air pressure or air pressure is released and supplied to the hydraulic control system 40 again.

The first control valve 8 is connected with the one-way valve 6, the first hydraulic cylinder 10 is provided with a first piston (not shown), and the first hydraulic cylinder 10 is connected with the first control valve 8 so that the first control valve 8 controls The first piston moves, and the first shift fork 11 is connected between the first piston and the first driving disc 14 to control the engagement and disconnection of the first driving disc 14 and the first driven disc 15 .

The second control valve 33 is connected with the one-way valve 6, the second hydraulic cylinder 32 is provided with a second piston (not shown), and the second hydraulic cylinder 32 is connected with the second control valve 33 so that the second control valve 33 controls The second piston moves, and the second shift fork 31 is connected between the second piston and the second driving disc 29 to control the engagement and disconnection of the second driving disc 29 and the second driven disc 28 . Optionally, both the first control valve 8 and the second control valve 33 may be electromagnetic valves. The first control valve 8 and the second control valve 33 may both be normally closed solenoid valves. When there is no electric signal input, the solenoid valve is closed, and when there is an electric signal input, the solenoid valve is open.

The accumulator 7 is connected to the connection pipeline shared by the check valve 6 and the first control valve 8 and the check valve 6 and the second control valve 33 . It can be understood that the inlet of the one-way valve 6 is connected with the second filter 5, the outlet of the one-way valve 6 is connected with the accumulator 7, and also connected with the first control valve 8 and the second control valve 33, so that Can control the flow of oil.

The control unit 9 is respectively connected with the first control valve 8 and the second control valve 33 to control the opening and closing state of the first control valve 8 and the opening and closing state of the second control valve 33 . Optionally, both the first control valve 8 and the second control valve 33 may be two-position three-way valves.

The working principle of the power transmission system 100 according to the embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

First-gear transmission process: the drive motor 30 transmits power to the input shaft 16 through the motor shaft, the first driving disc 14 of the first clutch 37 engages the first driven disc 15, and the input shaft 16 transmits power to the first driven disc 15 through the first clutch 37 The first sun gear 17 of a planetary gear mechanism 24, since the first ring gear 12 is fixed to the housing 20, the first planet carrier 21 serves as the power output end of the first planetary gear mechanism 24 to output power, and the output power is transmitted to the output The gear 18 and the output gear 18 mesh with the final drive gear 19, so that power can be transmitted to the differential 23 through the final drive to drive the vehicle. It should be noted that when the first gear is set, the steering of the drive motor 30 is forward rotation, and when the drive motor 30 is reversed, the power transmission system 100 can realize reverse gear driving. The black thick line shown in Figure 2 is the road map of the first gear transmission.

Second gear transmission process: the drive motor 30 transmits power to the input shaft 16 through the motor shaft, the second driving disc 29 of the second clutch 38 engages the second driven disc 28, and the input shaft 16 transmits power to the first driven disc 28 through the second clutch 38 Two planetary carriers 27, the second planetary carrier 27 is used as the power input end of the second planetary gear mechanism 35, and the second ring gear 25 can be used as the power output end of the second planetary gear mechanism 35, because the second ring gear 25 and the first planetary gear The frame 21 is fixedly connected, so the second ring gear 25 can transmit power to the output gear 18, and the output gear 18 meshes with the final drive gear 19, so that the power can be transmitted to the differential 23 through the final drive to drive the vehicle. The black bold line shown in Fig. 3 is the road map of the second gear transmission.

When going down a long slope and braking the vehicle, the vehicle can reverse-drag the motor to generate power to realize braking energy recovery. The first driving disc 14 of the first clutch 37 engages the first driven disc 15, the power is transmitted to the differential 23 through the wheels and the half shaft 22, and the differential 23 is transmitted to the final drive, and the final drive can pass through the final drive Gear 19 transmits to output gear 18, and output gear 18 can transmit power to first planetary gear mechanism 24, and first planetary gear mechanism 24 can transmit power to first clutch 37, thereby can transmit to input shaft 16 so that input shaft 16 can drive the drive motor 30 to realize braking energy recovery.

When the first gear is up to the second gear: When the power transmission system 100 meets the condition of the first gear up to the second gear, the control unit 9 sends a control signal to the first control valve 8 and the second control valve 33, the second control valve 33 is opened, and the hydraulic oil enters In the second hydraulic cylinder 32, the second piston in the second hydraulic cylinder 32 can be pushed to move, and then the second piston can drive the second shift fork 31 to connect the second driving disc 29 of the second clutch 38 to the second driven disc. 28. The rotational speed difference between the first driving disc 14 and the first driven disc 15 of the first clutch 37 can gradually decrease through the slipping of the second clutch 38 . When the rotational speeds of the first driving disc 14 and the first driven disc 15 were synchronized, the first control valve 8 was closed, and a return spring was provided in the first hydraulic cylinder 10, and the return spring could impel the first driving disc 14 and the first driven disc 14 to A driven disc 15 is disconnected, thereby completing the process of upgrading the first gear to the second gear, and there is no power interruption in the gear shifting process.

When downshifting from the second gear to the first gear: When the control unit 9 judges that the power transmission system 100 satisfies the condition for downshifting from the second gear to the first gear, the control unit 9 sends control signals to the first control valve 8 and the second control valve 33, and the second hydraulic cylinder 32 A return spring is provided. Under the action of the return spring, the second driving disc 29 and the second driven disc 28 of the second clutch 38 can be separated gradually. When the rotating speed of the first driving disc 14 and the first driven disc 15 When the rotation speed is synchronized, the first control valve 8 is opened, the hydraulic oil enters the first hydraulic cylinder 10, the first piston pushes the first shift fork 11 to make the first driving disc 14 and the first driven disc 15 engage, thus completing the second gear In the process of downshifting, there is no power interruption during the shifting process.

According to the power transmission system 100 of the embodiment of the present invention, there are two gears, which can effectively use the high-efficiency range of the driving motor 30, and the climbing acceleration is fast, and the power transmission system 100 is compact in structure, light in weight, and small in size. The power is consistent in the process. In addition, the power transmission system 100 adopts the first planetary gear mechanism 24 and the second planetary gear mechanism 35 with various structural forms, and different speed ratios can be designed according to requirements to meet the design requirements of different vehicles.

A vehicle according to an embodiment of the present invention includes the power transmission system 100 of the above-described embodiment. The vehicle with the power transmission system 100 of the above embodiment has high efficiency, fast acceleration when climbing, and compact structure, and can also realize light weight of the vehicle, and the power is consistent during the gear shifting process, and the speed ratio can be designed according to requirements.

In the description of this specification, references to the terms "one embodiment," "some embodiments," "exemplary embodiments," "example," "specific examples," or "some examples" are intended to mean that the implementation A specific feature, structure, material, or characteristic described by an embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications, substitutions and modifications can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the invention is defined by the claims and their equivalents.

Claims (10)

1. A power transmission system, characterized in that, comprising: case; a driving motor, the driving motor is arranged in the housing and has a motor shaft; an input shaft connected to the motor shaft; The first clutch, the first clutch includes a first driving disc and a first driven disc, the first driving disc is fixedly connected to the input shaft, and the first driven disc is set on the input shaft On the shaft, the first driving disc selectively engages and disengages the first driven disc; The second clutch, the second clutch includes a second driving disc and a second driven disc, the second driving disc is fixedly connected to the input shaft, and the second driven disc is set on the input shaft shaft, the second driving disc selectively engages and disengages the second driven disc; A first planetary gear mechanism, the first planetary gear mechanism includes: a first sun gear, a first planetary gear, a first planet carrier and a first ring gear, the first sun gear is fixed to the first driven plate connected, the first planetary gear is sleeved on the first planetary carrier and meshes with the first ring gear and the first sun gear respectively, and the first ring gear is fixedly connected with the housing; The second planetary gear mechanism, the second planetary gear mechanism includes: a second sun gear, a second planetary gear, a second planet carrier and a second ring gear, the second sun gear is fixedly connected to the first sun gear , the second planetary gear is sleeved on the second planetary carrier and meshes with the second sun gear and the second ring gear respectively, and the second ring gear is fixedly connected with the first planetary carrier , the second planet carrier is fixedly connected to the second driven plate; an output gear, the output gear is fixedly connected to the first planet carrier; A final reducer, the final reducer is provided with a final reducer gear, and the final reducer gear meshes with the output gear; a differential, the differential is connected to the final drive; A hydraulic control system, the hydraulic control system includes: an oil tank; a filter assembly connected to the fuel tank; An oil pump, the oil pump is connected to the filter assembly, and the oil pump is provided with an oil pump motor; a one-way valve, the one-way valve is connected with the oil pump; a first control valve, the first control valve is connected to the one-way valve; a first hydraulic cylinder, the first hydraulic cylinder is provided with a first piston and is connected to the first control valve so that the first control valve controls the movement of the first piston; a first shift fork, the first shift fork is connected between the first piston and the first driving disc to control the engagement and disconnection of the first driving disc and the first driven disc; a second control valve, the second control valve is connected to the one-way valve; a second hydraulic cylinder, the second hydraulic cylinder is provided with a second piston and is connected with the second control valve so that the second control valve controls the movement of the second piston; a second shift fork, the second shift fork is connected between the second piston and the second driving disc to control the engagement and disconnection of the second driving disc and the second driven disc; an accumulator, the accumulator is connected to the connecting pipeline shared by the one-way valve and the first control valve and the one-way valve and the second control valve; A control unit, the control unit is respectively connected with the first control valve and the second control valve to control the opening and closing state of the first control valve and the opening and closing state of the second control valve. 2 . The power transmission system according to claim 1 , wherein the first sun gear, the second sun gear and the first driven plate are coaxially arranged. 3. The power transmission system according to claim 2, wherein the first sun gear, the second sun gear and the first driven plate are integrally formed. 4. The power transmission system according to claim 1, wherein the first clutch is a dog clutch, and the second clutch is a dry clutch. 5. The power transmission system according to claim 1, wherein the first clutch is disposed adjacent to the first planetary gear mechanism, and the second clutch is disposed between the second planetary gear mechanism and the drive Between the motors, the second driving disc is arranged adjacent to the drive motor. 6. The power transmission system according to claim 1, wherein the filter assembly comprises a first filter and a second filter, the first filter is connected between the oil tank and the Between the oil pump, the second filter is connected between the oil pump and the one-way valve. 7. The power transmission system according to claim 1, wherein the input shaft is a solid shaft, and the first sun gear, the second sun gear and the first driven disc together form a hollow shaft And empty sleeve on the input shaft. 8. The power transmission system of claim 1, wherein the first control valve and the second control valve are solenoid valves. 9. The power transmission system according to claim 1, wherein the first clutch, the second clutch, the first planetary gear mechanism, the second planetary gear mechanism, the drive motor and The final reducer is integrated in the housing. 10. A vehicle, characterized by comprising the power transmission system according to any one of claims 1-9.