CN106627093B - A four-speed hybrid transmission for a hybrid vehicle and its use method - Google Patents

Abstract

The invention relates to a four-gear hybrid transmission for a hybrid electric vehicle and a use method thereof, belonging to the technical field of hybrid electric vehicle transmissions. The technical proposal is as follows: a second driving gear (12) and a third driving gear (11) which are arranged on an engine input shaft (10); a first driving gear (21) disposed on an input shaft (20) of the motor EM 1; an M1-gear driven gear (33), a G2-gear driven gear (32), a main reduction driving gear (31) and a synchronizer S2 which are arranged on an output shaft (30); a G1-gear driven gear (43), a G4-gear driven gear (42), a main reduction driving gear (41) and a synchronizer S1 which are arranged on an output two-shaft (40); a driving gear disposed on an input shaft (60) of the motor EM 2. The invention improves the gear multiplexing rate, the driving comfort and the power performance, has small size, reduces the oil consumption of the hybrid electric vehicle and reduces the exhaust emission.

Description

A four-speed hybrid transmission for a hybrid vehicle and its use method

technical field

The invention relates to a four-speed hybrid transmission for a hybrid electric vehicle and a method for using the same, belonging to the technical field of transmissions for hybrid electric vehicles.

Background technique

In recent years, the energy crisis and environmental pollution problems have become increasingly serious, and the formulation and implementation of relevant policies have emerged as the times require. Among many policies, the development and promotion of new energy vehicles has been greatly encouraged, and it is not difficult to see that it will become the new favorite trend of the automobile market.

Hybrid generally refers to gasoline-electric hybrid. Hybrid vehicles have dual engines of motor and engine, which can be driven by the single power of the motor or the engine, or can be driven by the motor and the engine at the same time. When the engine shifts gears, the motor provides power compensation, and the engine will be coordinated according to the driver's operation intention and road conditions during normal operation. and power output of the motor. A hybrid vehicle realizes the power matching of the electric motor and the engine through a hybrid transmission. Realize the advantages of sufficient power, low noise, low fuel consumption, and good comfort.

At present, the gearbox used in hybrid electric vehicles is difficult to achieve the advantages of compact structure, small size, good integration, and infinitely variable speed, but its control strategy is complicated, the machining accuracy is high, and the cost is high.

Contents of the invention

The object of the present invention is to provide a four-speed hybrid transmission for hybrid electric vehicles and its use method, which can achieve the perfect match of power, economy and driving comfort, reduce the fuel consumption of the car, provide power compensation for shifting, and eliminate the need for shifting gears. The feeling of frustration in the process improves the driving comfort and power of the vehicle, and solves the problems existing in the background technology.

Technical scheme of the present invention is:

A four-speed hybrid transmission for a hybrid electric vehicle, comprising: an engine input shaft, an electric motor EM1 input shaft, an electric motor EM2 input shaft, an intermediate wheel shaft and two output shafts arranged in parallel in the transmission; the two output shafts are respectively output one shaft and the second output shaft, No. 2 driving gear and No. 3 driving gear placed on the input shaft of the engine; No. 1 driving gear placed on the input shaft of the motor; G2 gear driven gear and main reduction gear placed on the first output shaft Driving gear, motor M1 gear driven gear and No. 2 synchronizer S2; G1 gear driven gear, G3 gear driven gear, main reduction driving gear, No. 1 synchronizer S1 placed on the second output shaft; set in the transmission case The differential in the body, the differential ring gear connected to the differential.

The above-mentioned parts are the basic structure of the transmission of the present invention, and the "basic structure" will refer to the whole composed of the above-mentioned parts.

In the transmission, the two ends of the differential are respectively connected to the wheels through the drive shaft; the No. 2 driving gear is in constant mesh with the G1 gear driven gear, the No. 3 driving gear is in constant mesh with the G2 gear and the G3 gear driven gear, and the motor EM1 The No. driving gear is in constant mesh with the driven gear of motor M1, the driving gear of motor EM2 is in constant mesh with the intermediate gear, the intermediate gear is in constant mesh with the G gear driven wheel, the main reduction driving gear is in constant mesh with the differential ring gear; the engine input shaft is in constant mesh with The engine is connected, and the motor input shaft is connected with the motor.

A method for using a four-speed hybrid transmission for a hybrid electric vehicle. The transmission is provided with four forward gears in total, and three forward gears are provided corresponding to the power transmission route of the engine, which are respectively second gear, third gear and fourth gear; The power transmission route of the electric motor has a forward gear and first gear; the corresponding forward gear of the engine is used for low-speed power assist, limp and high-speed driving respectively, and the electric motor can provide power compensation during the shifting process of the three gears; corresponding The forward gear of the electric motor is used for starting, climbing, normal driving and reversing of the car.

When the car is running at low speed, it is mainly driven by the electric motor, and the engine is mainly used for power assistance. When the car is running at high speed, it is mainly driven by the engine, and the electric motor provides power assistance. The electric motor EM2 is used for starting the engine, power compensation, energy recovery and charging the battery.

In addition to the basic structure, the transmission of the present invention also includes a shifting device, the No. 1 synchronizer on the output shaft and the No. 2 synchronizer fixedly connected on the output two shafts, so as to realize the gear shifting of the engine gear and the motor gear.

The four-speed hybrid transmission provided by the invention can realize the engine driving the car alone, the motor alone driving the car, the engine and the motor jointly driving the car, energy recovery, power compensation during gear shifting, the engine charging the battery, and the motor starting the engine.

Beneficial effects of the present invention: the present invention has the advantages of low cost, good inheritance, simple control, high transmission efficiency and high utilization rate. The four-speed hybrid transmission provided by the present invention enables the hybrid electric vehicle to be more driven by electric motors, improves the driving comfort, and takes into account the power and economy of the whole vehicle, reduces the fuel consumption of the hybrid electric vehicle, and reduces exhaust emissions . Therefore, the four-speed hybrid transmission provided by the present invention has very good application prospects.

Description of drawings

Fig. 1 is a schematic structural view of Embodiment 1 of the present invention;

Fig. 2 is a structural schematic diagram of Embodiment 2 of the present invention;

Fig. 3 is a schematic structural diagram of Embodiment 3 of the present invention;

Fig. 4 is a schematic structural diagram of Embodiment 4 of the present invention;

Fig. 5 is a schematic structural diagram of Embodiment 5 of the present invention;

Fig. 6 is a schematic diagram of the detailed structure of the present invention;

In the figure: engine EG, electric motor EM1, electric motor EM2; engine input shaft 10, No. 2 driving gear 12, No. 3 driving gear 11; first output shaft 30, main deceleration driving gear 31, G2 gear driven gear 32, M1 gear slave Driven gear 33; two output shafts 40, main deceleration driving gear 41, G3 gear driven gear 42, G1 gear driven gear 43; motor EM1 input shaft 20, No. 1 driving gear 21; intermediate wheel shaft 50, intermediate gear 51; EM2 Input shaft 60, EM2 driving wheel 61; differential 70, differential ring gear 71, drive shaft 72; No. 1 synchronizer S1, No. 2 synchronizer S2.

Detailed ways

The implementation of the present invention will be described in detail below through examples in conjunction with the accompanying drawings.

A four-speed hybrid transmission for a hybrid vehicle, comprising: an engine input shaft 10, an electric motor EM1 input shaft 20, an output first shaft 30, an output second shaft 40, an electric motor EM2 output shaft 60, and an intermediate wheel shaft 50 arranged in parallel in the transmission Place No. 2 driving gear 12 and No. 3 driving gear 11 on the engine input shaft 10; Place the No. 1 driving gear 21 on the motor input shaft 20; Place the M1 block driven gear 33 on the output first shaft 30, G2 gear driven gear 32, main deceleration driving gear 31, No. 2 synchronizer S2; G1 gear driven gear 43, G3 gear driven gear 42, main deceleration driving gear 41, No. 2 synchronization placed on the second output shaft 40 gear S1; the intermediate wheel 51 placed on the intermediate wheel shaft 50; the driving gear 61 placed on the motor input shaft 60; the differential 70 arranged in the transmission case, and the differential gear connected to the differential 70 Ring 71; the two ends of the differential 70 are respectively connected to the wheels through the transmission shaft 72. The above parts are the basic structure of the transmission of the present invention (hereinafter "basic structure" will refer to the whole composed of the above parts).

A method for using a four-speed hybrid transmission for a hybrid electric vehicle. The transmission is provided with a power separation device for an electric motor EM1 and an electric motor EM2. The electric motor can also be used as a generator. There are four forward gears in total, corresponding to the power of the engine EG. There are three forward gears in the power transmission route, which are G1 gear, G2 gear, G3 gear, neutral gear, and N gear; corresponding to the power transmission route of the electric motor EM1, there is a forward gear, M1 gear, and a reverse gear (and M1 gear), neutral gear and N gear; the three forward gears corresponding to the engine EG are used for car power assist, limp and high-speed driving respectively, and during the shifting process between the two gears, the electric motors EM1 and EM2 can perform power compensation ; Corresponding to the forward gear of the motor EM1, the M1 gear can be used for car starting, reversing, climbing, power assist and normal driving.

When the car is running at low speed, it is mainly driven by the electric motor EM1. The engine EG is mainly used for power assistance. When the car is running at high speed, it is mainly driven by the engine EG. The electric motor EM1 is used for power compensation and charging, and EM2 is used for starting the engine and power compensation.

Energy recovery: when the hybrid vehicle brakes or releases the accelerator, the motor EM1 works in the power generation mode, and the vehicle runs under inertia, and the wheels drive the transmission shaft 72, the differential ring gear 71, the main reduction driving gear 31, and the output shaft 30 Rotate, at this time the M1 gear of the transmission works, then the output shaft 30 drives the M1 gear driven gear 33, the first gear driving gear 21, and the motor input shaft 20 to rotate, and the mechanical energy is converted into electrical energy by the motor EM1 and stored in the battery to realize energy Recycle.

Power compensation: when the engine E alone drives the car, the transmission can realize power compensation during the shifting process of the transmission in G1, G2 and G3; when the transmission is in G1, G2 and G3 When switching, the power of the engine E will be interrupted. In order to avoid frustration, the motor EM1 or EM2 is used as the power source to compensate the power for the vehicle and improve the driving comfort of the vehicle; The gear 21 and the first block driven gear 31 are transmitted to the output first shaft 30, and then transmitted to the wheels through the main reduction driving gear 31, the differential ring gear 71 and the transmission shaft 72; EM2 power is passed through the motor input shaft 60, the driving gear 61, The intermediate wheel 51 is transmitted to the G block driven wheel 32, and then transmitted to the wheels through the final reduction drive gear 31, the differential ring gear 71, and the transmission shaft 72.

Embodiment one.

As shown in accompanying drawing 1, it is the first mode of arrangement of the motor and the engine of the present invention, the M1 gear is the first gear of the transmission, the G1 gear is the second gear of the transmission, the G2 gear is the third gear of the transmission, and the G3 gear is the fourth gear of the transmission. The M1 gear is realized by the reverse rotation of the motor EM1, and the EM2 is constantly meshed with the G2 gear driven gear through the intermediate wheel.

No. 1 driving gear 21 is in constant mesh with M1 driven gear 33, No. 2 driving gear 12 is in constant mesh with G1 driven gear 43, and No. 3 driving gear 11 is in constant mesh with G2 driven gear 32 and G3 driven gear 42 meshing, the intermediate gear 51 is constantly meshing with the output driving wheel 61 of the electric motor EM2 and the G3 gear driven wheel 32, and the main reduction driving gears 31 and 41 are constantly meshing with the differential ring gear 71; the engine input shaft 10 is connected with the engine EG, and the motor input shaft 20 is connected to the motor EM1, and the motor input shaft 60 is connected to the motor EM2.

The implementation of each gear position and the power route of the four-speed transmission in Embodiment 1 are as follows:

① M1 gear: The motor EM1 alone drives the car, the second synchronizer S2 is put into the M1 gear to the left, and the synchronizer S1 is in the neutral state. The power of the electric motor EM1 is transmitted to the output first shaft 30 through the motor input shaft 20, No. 1 driving gear 21, and M1 gear driven gear 33, and then through the main reduction driving gear 31, the differential ring gear 71, and the transmission shaft 72.

②G1 gear: The engine EG alone drives the car, the No. 1 synchronizer S1 is shifted to the left and put into the G1 gear, and the synchronizer S2 is in the neutral state. The power of the engine EG is transmitted to the output two shaft 40 through the engine input shaft 10, No. two driving gear 12, G1 gear driven gear 43, and then through the main reduction driving gear 41, the differential ring gear 71, and the transmission shaft 72.

③G2 gear: The engine EG alone drives the car, the second synchronizer S2 is shifted to the left and put into the G2 gear, and the synchronizer S1 is in neutral. The power of the engine EG is transmitted to the first output shaft 30 through the engine input shaft 10, No. three driving gear 11, and G2 gear driven gear 32, and then through the main reduction driving gear 31, the differential ring gear 71, and the transmission shaft 72.

④ G3 gear: The engine EG alone drives the car, the No. 1 synchronizer S1 is shifted to the right to G3 gear, and the synchronizer S2 is in neutral. The power of the engine EG is transmitted to the output two shaft 40 through the engine input shaft 10, No. three driving gear 11, G3 gear driven gear 42, and then through the main reduction driving gear 41, the differential ring gear 71, and the transmission shaft 72.

⑤ When the M1 gear and the G1 gear work at the same time, the engine EG and the electric motor EM1 jointly drive the car. The power transmission route is: the power of the engine EG is transmitted to the output second gear through the engine input shaft 10, the second driving gear 12, and the G1 gear driven gear 43. Shaft 40, through the main deceleration drive gear 41, differential ring gear 71, the power of the motor EM1 is transmitted to the output shaft 30 through the motor input shaft 20, No. 1 driving gear 21, M1 gear driven gear 33, through the main deceleration The driving gear 31 is transmitted to the differential ring gear 71, and the two powers are coupled and transmitted by the transmission shaft 72.

⑥When the G2 gear and the motor EM2 gear work at the same time, the engine EG and the motor EM2 are jointly driven to drive the car. The power transmission route is: the power of the engine EG passes through the engine input shaft 10, the No. The power of the motor is transmitted to the G2 block driven wheel 32 through the motor input shaft 60, the driving wheel 61, and the intermediate wheel 51. Passed out through transmission shaft 72.

⑦When the M1 gear and the G3 gear work at the same time, the engine EG and the electric motor EM1 jointly drive the car. The power transmission route is: the power of the engine EG is transmitted to the output second gear through the engine input shaft 10, the third driving gear 11, and the G3 gear driven gear 42. Shaft 40, then through main deceleration drive gear 41, differential ring gear 71, the power of motor EM1 is transmitted to output first shaft 30 through motor input shaft 20, No. 1 driving gear 21, M1 block driven gear 33, and then through main The deceleration driving gear 31 and the differential ring gear 71 are coupled and transmitted through the drive shaft 72 after the two powers are coupled.

Embodiment two.

As shown in accompanying drawing 2, it is the second mode of arrangement of the motor and the engine of the present invention, the M1 gear is the first gear of the transmission, the G1 gear is the second gear of the transmission, the G2 gear is the third gear of the transmission, and the G3 gear is the fourth gear of the transmission. The M1 gear is realized by the reverse rotation of the motor EM1, and the EM2 is constantly meshed with the G2 gear driven gear through the intermediate wheel.

No. 1 driving gear 21 is in constant mesh with M1 gear driven gear 43, No. 2 driving gear 12 is in constant mesh with G1 gear driven gear 33, and No. 3 driving gear 11 is in constant mesh with G2 gear driven gear 32 and G3 gear driven gear 42 meshing, the intermediate gear 51 is constantly meshing with the output driving wheel 61 of the electric motor EM2 and the G2 gear driven wheel 32, and the main reduction driving gears 31 and 41 are constantly meshing with the differential ring gear 71; the engine input shaft 10 is connected with the engine EG, and the motor input shaft 20 is connected to the motor EM1, and the motor input shaft 60 is connected to the motor EM2.

The implementation of each gear and the power route of the four-speed transmission in embodiment two are as follows:

①M1 gear: The motor EM1 alone drives the car, the No. 1 synchronizer S1 is put into the M1 gear to the left, and the synchronizer S2 is in neutral. The power of the electric motor EM1 is transmitted to the second output shaft 40 through the motor input shaft 20, No. 1 driving gear 21, M1 gear driven gear 43, and then through the main reduction driving gear 41, the differential ring gear 71, and the transmission shaft 72.

② G1 gear: the specific implementation and power transmission route are the same as those of G1 gear in Embodiment 1;

③G2 gear: The engine EG alone drives the car, the second synchronizer S2 is put into the G2 gear to the right, and the synchronizer S1 is in neutral. The power of the engine EG is transmitted to the first output shaft 30 through the engine input shaft 10, No. three driving gear 11, and G2 gear driven gear 32, and then through the main reduction driving gear 31, the differential ring gear 71, and the transmission shaft 72.

4. G3 block: the specific implementation method and the power transmission route are identical with the G3 block in the embodiment one;

⑤ When M1 gear and G1 gear work at the same time, the engine EG and the electric motor EM1 jointly drive the car. The power transmission route is: the power of the engine EG is transmitted to the output one through the engine input shaft 10, the second driving gear 12, and the G1 gear driven gear 33. Shaft 30 passes through the main deceleration driving gear 31 and the differential ring gear 71, and the power of the motor EM1 is transmitted to the output second shaft 40 through the motor input shaft 20, No. 1 driving gear 21 and M1 gear driven gear 43, and then through the main deceleration The driving gear 41 is transmitted to the differential ring gear 71, and the two powers are coupled and transmitted by the transmission shaft 72.

⑥When the M1 gear and the G2 gear work at the same time, the engine EG and the electric motor EM1 can jointly drive the car. The power transmission route is: the power of the engine EG is transmitted to the output one through the engine input shaft 10, the second driving gear 11, and the G2 gear driven gear 32. Shaft 30 passes through the main deceleration driving gear 31 and the differential ring gear 71, and the power of the motor EM1 is transmitted to the output second shaft 40 through the motor input shaft 20, No. 1 driving gear 21 and M1 gear driven gear 43, and then through the main deceleration The driving gear 41 is transmitted to the differential ring gear 71, and the two powers are coupled and transmitted by the transmission shaft 72.

⑦When the G3 gear and the motor EM2 gear work at the same time, the engine EG and the motor EM2 jointly drive the car. The power transmission route is: the power of the engine EG passes through the engine input shaft 10, the third driving gear 11, the G2 gear driven gear 32, and the motor EM2 The power of the motor is transmitted to the G2 block driven wheel 32 through the motor input shaft 60, the driving wheel 61, and the intermediate wheel 51. Passed out through transmission shaft 72.

Embodiment three.

As shown in accompanying drawing 3, it is the third mode of arrangement of the motor and the engine of the present invention. The M1 gear is realized by the reverse rotation of the motor EM1, and the EM2 is constantly meshed with the G3 gear driven gear through the intermediate wheel.

No. 1 driving gear 21 is in constant mesh with M1 driven gear 33, No. 2 driving gear 12 is in constant mesh with G1 driven gear 43, and No. 3 driving gear 11 is in constant mesh with G2 driven gear 32 and G3 driven gear 42 meshing, the intermediate gear 51 is constantly meshing with the output driving wheel 61 of the motor EM2 and the G1 gear driven wheel 33, the main reduction driving gears 31 and 41 are constantly meshing with the differential ring gear 71; the engine input shaft 10 is connected with the engine EG, and the motor input shaft 20 is connected to the motor EM1, and the motor input shaft 60 is connected to the motor EM2.

The implementation of each gear and the power route of the four-speed transmission in embodiment three are as follows:

①M1 block: the specific implementation method and power transmission route are the same as those of the M1 block in the first embodiment;

② G1 gear: the specific implementation and power transmission route are the same as those of G1 gear in Embodiment 1;

3. G2 block: the specific implementation method and the power transmission route are the same as those of the G2 block in the first embodiment;

4. G3 block: the specific implementation method and the power transmission route are identical with the G3 block in the embodiment one;

⑤ When the M1 block and the G1 block work simultaneously, its power transmission route is the same as that of Embodiment 1; ⑤;

⑥When the gear G2 and the gear EM2 of the electric motor work at the same time, the power transmission route is the same as that of Example 1 ⑥

7. When the M1 gear and the G3 gear work simultaneously, its power transmission route is the same as that of Embodiment 1. 7.

Embodiment four.

As shown in accompanying drawing 4, it is the fourth mode of arrangement of the electric motor and the engine of the present invention. The M1 gear is realized by the reverse rotation of the motor EM1, and the EM2 is constantly meshed with the G2 gear driven gear through the intermediate wheel.

No. 1 driving gear 21 is in constant mesh with M1 gear driven gear 43, No. 2 driving gear 12 is in constant mesh with G1 gear driven gear 33, and No. 3 driving gear 11 is in constant mesh with G2 gear driven gear 32 and G3 gear driven gear 42 meshing, the intermediate gear 51 is constantly meshing with the output driving wheel 61 of the electric motor EM2 and the G2 gear driven wheel 32, and the main reduction driving gears 31 and 41 are constantly meshing with the differential ring gear 71; the engine input shaft 10 is connected with the engine EG, and the motor input shaft 20 is connected to the motor EM1, and the motor input shaft 60 is connected to the motor EM2.

The implementation of each gear and the power route of the four-speed transmission in Embodiment 4 are as follows:

① M1 block: the specific implementation method and power transmission route are the same as those of the M1 block in the second embodiment;

②G1 block: the specific implementation method and the power transmission route are the same as those of the G1 block in the second embodiment;

3. G2 block: the specific implementation method and the power transmission route are the same as those of G2 block in the second embodiment;

4. G3 block: specific implementation and power transmission route are identical with the G3 block in embodiment two;

⑤ When the M1 block and the G1 block work simultaneously, its power transmission route is the same as that of the second embodiment ⑤;

⑥ When the gear G2 and the EM2 gear of the electric motor work at the same time, the power transmission route is the same as that of Example 2 ⑥

7. When M1 block and G3 block work simultaneously, its power transmission route is identical with embodiment two 7.

Embodiment five.

As shown in accompanying drawing 5, it is the first mode of arrangement of the motor and the engine of the present invention, the M1 gear is the first gear of the transmission, the G1 gear is the second gear of the transmission, the G2 gear is the third gear of the transmission, and the G3 gear is the fourth gear of the transmission. The gear is the M1 gear and is realized through the reverse rotation of the electric motor EM1.

No. 1 driving gear 21 is in constant mesh with M1 driven gear 33, No. 2 driving gear 12 is in constant mesh with G1 driven gear 43, and No. 3 driving gear 11 is in constant mesh with G2 driven gear 32 and G3 driven gear 42 meshing, the final drive gears 31 and 41 are in constant mesh with the differential ring gear 71; the engine input shaft 10 is connected to the engine EG, the motor input shaft 20 is connected to the motor EM1, and the motor input shaft 60 is connected to the motor EM2.

The implementation of each gear and the power route of the four-speed transmission in the fifth embodiment are as follows:

①M1 block: the specific implementation method and power transmission route are the same as those of the M1 block in the first embodiment;

② G1 gear: the specific implementation and power transmission route are the same as those of G1 gear in Embodiment 1;

3. G2 block: the specific implementation method and the power transmission route are the same as those of the G2 block in the first embodiment;

4. G3 block: the specific implementation method and the power transmission route are identical with the G3 block in the embodiment one;

⑤ When the M1 block and the G1 block work simultaneously, its power transmission route is the same as that of Embodiment 1; ⑤;

6. When the M1 gear and the G3 gear work simultaneously, its power transmission route is the same as that of Embodiment 1. 7.

When the four-speed transmission provided by the present invention is placed in a hybrid vehicle, the engine input shaft 10 is connected to the engine EG, the motor input shaft 20 is connected to the electric motor EM1, and the electric motor EM2 is connected to the G2 gear driven wheel. The functions that the transmission can realize and The implementation method is as follows:

a) The motor EM1 alone drives the car: When the M1 gear of the transmission is working, the motor EM1 can drive the car alone.

b) The engine EG alone drives the car: when the G1, G2 or G3 gear of the transmission works, the engine EG alone can drive the car.

c) The electric motor EM1 and the engine EG drive the car together: when one of the G1, G2, and G3 gears of the transmission works simultaneously with the M1 or EM2 gear, the engine EG and the electric motor EM are used as the power source. Realize that the electric motor EM and the engine EG jointly drive the vehicle to run.

d) When the engine is driven by itself, power compensation in the shifting process: when the engine EG alone drives the car, when the transmission changes between G1, G2, and G3, M1 or EM2 works, and the motor EM can be realized as the engine. The process of shifting gears provides power compensation; when the motor EM1 changes between M1 and G1, the EM2 motor works to provide power compensation.

e) Auxiliary energy recovery: When the car brakes or goes downhill, the transmission M1 gear works, and the electric motor EM1 works in the power generation mode, which can realize energy recovery.

Fig. 6 is a schematic diagram of the detailed structure of the present invention, the arrangement of the gears and the power transmission path are the same as those in the first embodiment (Fig. 1).

Claims (3)

1. A four-gear hybrid transmission for a hybrid electric vehicle is characterized in that: comprises an engine input shaft (10), a motor EM1 input shaft (20), an output one shaft (30), an output two shaft (40), a intermediate wheel shaft (50) and a motor EM2 input shaft (60) which are arranged in parallel in the transmission; a second driving gear (12) and a third driving gear (11) which are arranged on an engine input shaft (10); a first driving gear (21) disposed on an input shaft (20) of the motor EM 1; an M1-gear driven gear or G1-gear driven gear (33), a G2-gear driven gear (32) and a main reduction driving gear (31) which are arranged on an output shaft (30); a G1 gear driven gear or M1 gear driven gear (43), a G4 gear driven gear (42) and a main reduction driving gear (41) which are arranged on an output two shaft (40); a driving gear disposed on an input shaft (60) of the motor EM2; a intermediate wheel (51) disposed on the intermediate wheel shaft (50); a differential (70) disposed in the transmission case, a differential ring gear (71) connected to the differential (70); the two ends of the differential mechanism (70) are respectively connected with wheels through transmission shafts (72); the first driving gear 21 is normally meshed with the M1-gear driven gear, the second driving gear 12 is normally meshed with the G1-gear driven gear, the third driving gear 11 is normally meshed with the G2-gear driven gear and the G3-gear driven gear, the intermediate wheel 51 is normally meshed with the motor EM2 output driving wheel 61 and the G2-gear driven wheel 32, and the main reduction driving gears 31 and 41 are normally meshed with the differential gear ring 71; engine input shaft 10 is connected to engine EG, motor input shaft 20 is connected to motor EM1, and motor input shaft 60 is connected to motor EM 2.

2. The four-speed hybrid transmission for a hybrid vehicle according to claim 1, wherein: the speed changer comprises a second synchronizer (S2) fixedly connected to an output first shaft (30); a first synchronizer (S1) fixedly connected to the output biaxial (40); the second driving gear (12), the third driving gear (11) are fixedly connected to the input shaft (10); the first driving gear (21) is fixedly connected to the input shaft (20).

3. The application method of the four-gear hybrid transmission for the hybrid electric vehicle is characterized by comprising the following steps of: using the transmission defined in claim 1 or 2, the transmission is provided with four forward gears in total, and three forward gears, namely two gears, three gears and four gears, are arranged corresponding to the power transmission route of the engine; a forward gear and a first gear are arranged corresponding to the power transmission route of the motor; the corresponding engine forward gears are respectively used for low-speed power assisting, limp-home running and high-speed running of the automobile, and the motor can provide power compensation in the gear shifting process of the three gears; the forward gear of the corresponding motor is used for starting, climbing, normal running and reversing of the automobile.

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