Hybrid power gearbox driven by two gears of engine

Abstract

The utility model belongs to the technical field of hybrid power gearboxes, and particularly relates to an engine two-gear driven hybrid power gearbox which comprises an engine with a shock absorber, a generator, a driving motor, three power sources, and a gear clutch transmission system which is connected with the three power sources and transmits power of the three power sources. The connection and separation of the engine and the driving output end of the gearbox and the conversion of a power transmission path of the engine are realized through the opening and closing control of a clutch in the gear clutch transmission system; on one hand, according to the modular design scheme of each functional system, through the design change of the two-gear driving system of the engine, the same-platform development of multiple types of hybrid power gearboxes with different functions can be realized; on the other hand, under the control of the motor driving unit, the gearbox control unit and the hybrid power system control unit which are integrated, the three power sources work cooperatively, and the vehicle dynamic property and the fuel economy are improved. And the requirements of emission regulations are met.

Description

Technical Field

[0001] The utility model relates to the technical field of hybrid power gearboxes, in particular to a hybrid power gearbox driven by an engine in two gears. Background Art

[0002] As a core component of the powertrain system of hybrid electric vehicles (HEV, PHEV), the hybrid transmission can improve the fuel economy and optimize the power of the vehicle under multiple working conditions by controlling the power coupling of the engine and the motor in real time. With the rapid growth of the global car ownership, the pressure on energy, environment, safety and other aspects is increasing, forcing the global automobile energy conservation and electrification process to accelerate. Faced with the industry bottlenecks such as the anxiety of driving range of pure electric vehicles, the imperfect construction of charging infrastructure, and the difficulty of achieving major technological breakthroughs in power batteries in the short and medium term, pure electric vehicles are currently unable to meet the current market demand for automobile use. Ordinary hybrid electric vehicles (HEV) and plug-in hybrid electric vehicles (PHEV) can not only meet the current domestic and foreign emission energy conservation target requirements, but also meet the current market conditions, and have been widely promoted and applied worldwide. In the medium and long term, passenger cars using hybrid power will still be an important model in the domestic and foreign automobile consumption field, with great market prospects. Developing a hybrid transmission with powerful functions, low control difficulty, simple structure, low manufacturing cost, modular design, multi-variety function expansion, and small size to cover more models has become an urgent problem to be solved.

[0003] In order to solve the above problems, the present application proposes a hybrid power transmission with two-speed engine drive. Utility Model Content

[0004] (I) Purpose of the utility model

[0005] In order to solve the technical problems existing in the background technology, the utility model proposes a hybrid power transmission driven by an engine in two gears.

[0006] (II) Technical solution

[0007] In order to solve the above problems, the utility model provides a hybrid transmission driven by an engine in two gears, including an engine with a shock absorber, a generator and a drive motor, and a gear clutch transmission system that connects the three power sources and transmits the power of the three power sources. Through the opening and closing control of the clutch in the gear clutch transmission system, the connection and separation of the engine power and the transmission drive output end and the transformation of the power transmission path are realized. The gear clutch transmission system includes an engine-driven generator power generation system, a drive motor pure electric drive system and an engine two-gear drive system.

[0008] Furthermore, the engine driven generator power generation system includes a generator and a generator rotor shaft, the generator rotor shaft is provided with a generator driven gear, the generator driven gear is meshed with a generator driving gear provided on an input shaft, and the input shaft is spline-connected to a shock absorber on the engine, thereby constituting an engine driven generator power generation system.

[0009] Furthermore, the pure electric drive system of the drive motor includes a drive motor gear shaft splined to the drive motor, an electric drive driving gear is arranged on the drive motor gear shaft, and the electric drive driving gear is meshed with the electric drive driven gear arranged on the electric drive output shaft; the electric drive output shaft is also provided with an electric drive main reduction driving gear, and the electric drive main reduction driving gear is meshed with the main reduction driven gear on the differential, forming a pure electric drive system of the drive motor.

[0010] Furthermore, the engine two-speed drive system includes an engine low-speed gear drive system, wherein a first clutch and an engine low-speed gear drive driving gear are arranged on the input shaft, and the engine low-speed gear drive driving gear is meshed with an engine low-speed gear drive driven gear arranged on the engine drive output shaft; an engine drive main reduction driving gear is also arranged on the engine drive output shaft, and the engine drive main reduction driving gear is meshed with the main reduction driven gear on the differential, thereby constituting the engine low-speed gear drive system.

[0011] Furthermore, the engine two-speed drive system also includes an engine high-speed drive system, and a second clutch and an engine high-speed drive driven gear are arranged on the engine drive output shaft. The engine high-speed drive driven gear is meshed with the power generation driving gear and the engine high-speed drive driving gear arranged on the input shaft, and the power of the engine is transmitted through the engine drive main reduction driving gear, the main reduction driven gear, and the differential to form an engine high-speed drive system.

[0012] Furthermore, the power generation driving gear arranged on the input shaft also has the function of the engine high-speed driving gear.

[0013] Furthermore, the power generation driven gear is integrated on the generator rotor shaft.

[0014] Furthermore, the first clutch and the second clutch are hydraulic wet clutches.

[0015] Furthermore, the engine driven generator power generation system, the drive motor pure electric drive system and the engine two-speed drive system are modularly designed with a simpler structure. By adjusting the design of the engine two-speed drive system, two hybrid power transmission products with different functions, namely engine single-speed drive and non-engine drive (extended range), can be developed on the same platform and produced on the same line.

[0016] The above technical solution of the utility model has the following beneficial technical effects:

[0017] On the one hand, the modular design of each functional system of the utility model can realize the development of multiple hybrid transmissions with different functions on the same platform through the design changes of the engine two-speed drive system; on the other hand, under the control of the integrated motor drive unit, transmission control unit, and hybrid system control unit, the three power sources work together to improve the vehicle's power and fuel economy and meet the requirements of emission regulations.

[0018] The utility model integrates coordinated control of the motor drive unit, transmission control unit, and hybrid system control unit to realize functions such as engine start and stop, parking power generation, pure electric drive, engine two-speed drive, reversing, and brake energy recovery, ultimately achieving improved vehicle fuel economy and meeting emission regulations. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The utility model is a structural schematic diagram of a hybrid power transmission with two-speed engine drive.

[0020] In the figure:

[0021] 1. Engine; 2. Shock absorber; 3. Input shaft; 4. Engine low-speed gear driving driving gear; 5. Generator driving gear; 6. Engine high-speed gear driving driving gear; 7. Generator rotor shaft; 8. Generator driven gear; 9. Generator; 10. Engine drive output shaft; 11. Engine low-speed gear driving driven gear; 12. Engine drive main reduction driving gear; 13. Engine high-speed gear driving driven gear; 14. Drive motor; 15. Drive motor gear shaft; 16. Electric drive driving gear; 17. Electric drive output shaft; 18. Electric drive driven gear; 19. Electric drive main reduction driving gear; 20. Differential; 21. Main reduction driven gear; C1, first clutch; C2, second clutch. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail below in combination with specific implementation methods and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the utility model. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the utility model.

[0023] like Figure 1As shown, the utility model provides a hybrid power transmission driven by an engine in two gears, comprising three power sources, namely an engine 1 with a shock absorber 2, a generator 9 and a drive motor 14, and a gear clutch transmission system connecting the three power sources and transmitting the power of the three power sources. The connection and separation between the engine 1 and the transmission drive output end and the change of the power transmission path are realized by opening and closing control of the clutch in the gear clutch transmission system; the gear clutch transmission system comprises an engine driven generator power generation system, a drive motor pure electric drive system and an engine two-gear drive system.

[0024] In a specific embodiment of the present utility model, the engine driven generator power generation system includes a generator 9 and a generator rotor shaft 7, and a generator driven gear 8 is provided on the generator rotor shaft 7. The generator driven gear 8 is meshed with the generator driving gear 5 provided on the input shaft 3, and the input shaft 3 is spline-connected with the shock absorber 2 on the engine 1, forming an engine driven generator power generation system.

[0025] In a specific embodiment of the present utility model, the pure electric drive system of the drive motor includes a drive motor gear shaft 15 spline-connected to the drive motor 14, and an electric drive driving gear 16 is arranged on the drive motor gear shaft 15, and the electric drive driving gear 16 is meshed with an electric drive driven gear 18 arranged on the electric drive output shaft 17; the electric drive output shaft 17 is also provided with an electric drive main reduction driving gear 19, and the electric drive main reduction driving gear 19 is meshed with the main reduction driven gear 21 on the differential 20, forming a pure electric drive system of the drive motor.

[0026] In a specific embodiment of the present utility model, the engine two-speed drive system includes an engine low-speed gear drive system, the input shaft 3 is provided with a first clutch C1 and an engine low-speed gear drive driving gear 4, the engine low-speed gear drive driving gear 4 is meshed with an engine low-speed gear drive driven gear 11 provided on the engine drive output shaft 10; the engine drive output shaft 10 is also provided with an engine drive main reduction driving gear 12, the engine drive main reduction driving gear 12 is meshed with the main reduction driven gear 21 on the differential 20, forming an engine low-speed gear drive system.

[0027] In a specific embodiment of the present utility model, the engine two-speed drive system also includes an engine high-speed drive system, and a second clutch C2 and an engine high-speed drive driven gear 13 are provided on the engine drive output shaft 10, and the engine high-speed drive driven gear 13 is meshed with the power generation driving gear 5 and the engine high-speed drive driving gear 6 provided on the input shaft 3, and the power of the engine 3 is transmitted through the engine drive main reduction driving gear 12, the main reduction driven gear 21, and the differential 20 to form an engine high-speed drive system.

[0028] The working mode of the hybrid transmission of this engine two-speed drive is as follows:

[0029] Parking power generation: When the vehicle is stopped, the first clutch C1 and the second clutch C2 are both open, and the power of the engine 1 drives the generator 9 through the shock absorber 2, the input shaft 3, the power generation driving gear 5, the power generation driven gear 8, and the generator rotor shaft 7 to generate electricity and charge the vehicle battery pack.

[0030] Pure electric drive: The vehicle starts and is driven by a single drive motor 14. The first clutch C1 and the second clutch C2 are both open, and the power of the drive motor 14 drives the vehicle through the drive motor gear shaft 15, the electric drive driving gear 16, the electric drive driven gear 18, the electric drive output shaft 17, the electric drive main reduction driving gear 19, the main reduction driven gear 21, and the differential 20. The power used by the drive motor 14 comes from the vehicle battery pack.

[0031] Extended-range drive: When the vehicle is in motion and the first clutch C1 and the second clutch C2 are both open, the power of the engine 1 drives the generator 9 to generate electricity through the shock absorber 2, the input shaft 3, the generator driving gear 5, the generator driven gear 8, and the generator rotor shaft 7, and charges the vehicle battery pack or directly provides driving power to the drive motor 14. The drive motor 14 performs the aforementioned pure electric drive function. Unlike the aforementioned pure electric drive, the power required by the drive motor during extended-range drive comes partly from the vehicle battery pack and partly from the generator 9.

[0032] Engine start and stop: The start and stop of the engine 1 in the parking power generation or vehicle driving state is completely driven and controlled by the generator 9.

[0033] Reversing: The vehicle reverses when the drive motor is in pure electric drive or extended-range drive mode.

[0034] Braking energy recovery: Braking energy recovery during vehicle driving is implemented by converting the driving motor 14 into a power generation state.

[0035] Engine low-speed gear drive: When the first clutch C1 is closed and the second clutch C2 is open, the power of the engine 1 drives the vehicle through the shock absorber 2, the input shaft 3, the first clutch C1, the engine low-speed gear drive gear 4, the engine low-speed gear drive driven gear 11, the engine drive output shaft 10, the engine drive main reduction driving gear 12, the main reduction driven gear 21, and the differential 20. In this working condition, the generator 9 and the drive motor 14 are both in an idling state.

[0036] Engine low-speed gear drive, dual-motor auxiliary drive: Under the aforementioned engine low-speed gear drive condition, the generator 9 is placed in the power generation state, the engine is placed in a high fuel efficiency range for stable operation, and the vehicle acceleration and deceleration and brake energy recovery deceleration are controlled by switching the positive and negative torque of the drive motor 14 or adjusting the drive torque.

[0037] Engine high gear drive: When the first clutch C1 is open and the second clutch C2 is closed, the power of the engine 1 drives the vehicle forward through the input shaft 3, the power generation driving gear 5 and the engine high gear driving gear 6, the engine high gear driving driven gear 13, the second clutch C2, the engine drive output shaft 10, the engine drive main reduction driving gear 12, the main reduction driven gear 21, and the differential 20. The generator 9 and the drive motor 14 are both in an idling state.

[0038] Engine high gear drive dual motor auxiliary drive: Under the engine high gear drive condition, the generator 9 is placed in a power generation state, the engine is placed in a high fuel efficiency range for stable operation, and the drive motor 14 controls vehicle acceleration and deceleration and brake energy recovery deceleration by converting positive and negative drive torque or adjusting the drive torque.

[0039] The first clutch C1 and the second clutch C2 are hydraulically controlled wet clutches.

[0040] The gearbox is equipped with an electric oil pump, including a high-pressure oil pump, a low-pressure oil pump and a solenoid valve. The high-pressure oil pump and the solenoid valve are used for clutch opening and closing control, and the low-pressure oil pump is used for cooling and lubricating the running parts, generators and drive motors in the gearbox.

[0041] Although the embodiments of the present invention have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and purposes of the present invention, including but not limited to: changing the hydraulic clutch to an electronically controlled mechanical clutch, changing the electronically controlled oil pump to a mechanical oil pump, and changing the generator driven gear integrated on the generator rotor shaft to a non-integrated split scheme; or reducing the engine drive gears and clutches to transform into two hybrid transmission schemes of engine single gear drive or extended range drive; etc. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A hybrid transmission with two-speed engine drive, comprising three power sources, namely an engine (1) with a shock absorber (2), a generator (9) and a drive motor (14), and a gear clutch transmission system for connecting the three power sources and transmitting the power of the three power sources, characterized in that: The connection and separation between the engine (1) and the transmission drive output end and the change of the power transmission path are achieved by opening and closing the clutch in the gear clutch transmission system; the gear clutch transmission system comprises an engine driven generator power generation system, a drive motor pure electric drive system and an engine two-speed drive system; the engine driven generator power generation system comprises a generator (9) and a generator rotor shaft (7); a generator driven gear (8) is arranged on the generator rotor shaft (7); the generator driven gear (8) is meshed with a generator driving gear (5) arranged on the input shaft (3); the input shaft (3) is spline-connected with the shock absorber (2) on the engine (1), thereby forming the engine driven generator power generation system; the drive motor pure electric drive system comprises a drive motor (14) and a drive motor gear shaft (15) spline-connected to the drive motor rotor shaft; the drive motor gear shaft (15) is provided with an electric drive driving gear (16); the electric drive driving gear (16) is meshed with the electric drive driving gear (5) arranged on the input shaft (3); the input shaft (3) is spline-connected with the shock absorber (2) on the engine (1), thereby forming the engine driven generator power generation system; The driven gear (16) meshes with an electric driven driven gear (18) provided on the electric driven output shaft (17); the electric driven output shaft (17) is also provided with an electric driven main reduction driving gear (19), the electric driven main reduction driving gear (19) meshes with a main reduction driven gear (21) on the differential (20), forming a pure electric drive system of the drive motor; the engine two-speed drive system comprises an engine low-speed gear drive system, the input shaft (3) is provided with a first clutch (C1) and an engine low-speed gear driving gear (4), the engine low-speed gear driving gear (4) meshes with an engine low-speed gear driven gear (11) provided on the engine driven output shaft (10); the engine driven main reduction driving gear (12) is also provided on the engine driven output shaft (10), the engine driven main reduction driving gear (12) meshes with a main reduction driven gear (21) on the differential (20), forming an engine low-speed gear drive system.

2. The engine two-speed driven hybrid power transmission according to claim 1, characterized in that: The engine two-speed drive system also includes an engine high-speed drive system, wherein a second clutch (C2) and an engine high-speed drive driven gear (13) are arranged on the engine drive output shaft (10), and the engine high-speed drive driven gear (13) is meshed with a power generation driving gear (5) and an engine high-speed drive driving gear (6) arranged on the input shaft (3), so that the power of the engine (1) is transmitted through the engine drive main reduction driving gear (12), the main reduction driven gear (21), and the differential (20), thereby forming an engine high-speed drive system.

3. The engine two-speed driven hybrid power transmission according to claim 2, characterized in that: The power generation driving gear (5) on the input shaft (3) also has the function of driving the engine high-speed gear driving gear (6).

4. The engine two-speed driven hybrid power transmission according to claim 1, characterized in that: The generator driven gear (8) is integrated on the generator rotor shaft (7).

5. The engine two-speed driven hybrid power transmission according to claim 1, characterized in that: The first clutch (C1) and the second clutch (C2) are hydraulically controlled wet clutches.

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