Series hybrid power gearbox with longitudinally-arranged engine

Abstract

The invention relates to the technical field of hybrid power gearboxes, in particular to a series hybrid power gearbox with a longitudinally-arranged engine, which comprises a longitudinally-arranged engine, a generator and a driving motor, the gear clutch transmission system is connected with the three power sources, transmits power of the three power sources and realizes power generation and driving; the gear clutch transmission system comprises a power generation system, a drive motor pure electric drive system, a generator two-gear pure electric drive system, an engine two-gear drive system and a front drive transfer system. On one hand, rear wheel two-gear driving and double-motor pure electric driving with the engine arranged longitudinally can be achieved, on the other hand, four-wheel hybrid driving is achieved through the built-in front-drive transfer shaft, and meanwhile parts such as a hydraulic control wet clutch or a driving motor and a gear thereof, the front-drive transfer shaft and the like are omitted; various hybrid power transmission products with different functions can be designed on the same platform and produced on the same line, and the requirements of different users and vehicle types are met.

Description

Technical Field

[0001] The present invention relates to the technical field of hybrid transmissions, and in particular to a series of hybrid transmissions with longitudinally mounted engines. 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 of the whole vehicle and optimize the power performance of the whole vehicle under multiple working conditions by real-time controlling the power coupling of the engine, generator and drive motor.

[0003] Many high-end passenger cars with fuel engines, medium and large SUVs, as well as light commercial vehicles such as pickups and light trucks use rear-wheel drive or four-wheel drive with longitudinally mounted engines. Most of the mass-produced hybrid transmissions on the domestic market adopt front-wheel drive with transversely mounted engines. There are still few mass-produced longitudinally mounted rear-wheel drive hybrid transmissions. During the new energy transformation of such models with longitudinally mounted engines and rear-wheel drive, some models use a hybrid drive method composed of pure electric drive of the rear wheels plus a single-motor or dual-motor hybrid transmission of the front wheels. Some models, in order to be able to use the mass-produced transversely mounted front-wheel drive hybrid transmission, change the longitudinally mounted engine to a transversely mounted manner. However, changing the longitudinal engine to a transverse one requires relatively large modifications to the vehicle, and many models cannot well complete the adjustment design of this engine layout.

[0004] Such models generally require relatively large driving forces. Especially some models with longitudinally mounted engines and four-wheel drive often pursue extreme off-road performance. Some of these models have used a solution of a longitudinally mounted rear-wheel drive hybrid transmission plus a four-wheel drive transfer case with two gear functions. The four-wheel drive transfer case has two speed ratio gears. The speed ratio of gear one is 1, which belongs to the normal driving gear; the speed ratio of gear two is generally greater than 2, which can multiply the output torque of the transmission. This gear is used to ensure the extreme off-road performance of the vehicle. However, the independently purchased two-speed four-wheel drive transfer case results in a high overall cost of the system. Summary of the Invention

[0005] The technical problem to be solved by the present invention is: to solve the problems in the above background art that the existing longitudinally mounted hybrid transmissions are few in mass production, some models are forced to switch to transverse or rear-wheel drive pure electric + front-wheel drive hybrid solutions, the cost of an independent two-speed transfer case is high, and it is difficult to balance performance and economy, and to provide a series of hybrid transmissions with longitudinally mounted engines.

[0006] The technical solution adopted by the present invention to solve its technical problems is: a series of hybrid transmissions with longitudinally mounted engines, including: A power source, which includes a longitudinally mounted engine with a shock absorber, as well as a generator and a drive motor coaxially arranged with the engine; A gear clutch transmission system, which includes: Shafting: input shaft, intermediate shaft, rear drive output shaft, idler shaft, front drive transfer shaft; Transmission components: gears, bearings, clutches and synchronizers installed on each shaft, Functional subsystems: a. Power generation system: The engine on the input shaft drives the driving gear to mesh with the driven gear on the intermediate shaft, and the power transmission to the generator is controlled by a hydraulically controlled wet clutch; b. Two-speed engine drive system: Select the high-speed driving gear or the low-speed and electric drive gear assembly through the synchronous shift device to transmit the engine power to the rear drive output shaft; c. Single-speed pure electric drive system of the drive motor: The electric driving gear on the drive motor rotor shaft meshes with the electric driven gear fixed to the low-speed gear assembly to drive the rear drive output shaft; d. Two-speed pure electric drive system of the generator: When the hydraulically controlled wet clutch is disengaged, the power of the generator is transmitted to the rear drive output shaft through the intermediate shaft and the synchronous shift device for gear shifting; e. Front drive transfer system: The idler on the idler shaft meshes with the low-speed driving driven gear and the front drive transfer shaft gear, and the power output to the front drive transfer shaft is controlled by an electromagnetic clutch.

[0007] According to an embodiment of the present invention, in the power generation system, the hydraulically controlled wet clutch is arranged on the intermediate shaft for connecting or disconnecting the engine-driven driven gear and the intermediate shaft; the power generation driven gear on the generator rotor shaft meshes with the power generation driving gear on the intermediate shaft.

[0008] According to an embodiment of the present invention, in the two-speed engine drive system, the high-speed driving gear meshes with the high-speed driving driven gear on the rear drive output shaft; the low-speed and electric drive gear assembly connects the low-speed driving gear and the electric driven gear and meshes with the low-speed driving driven gear on the rear drive output shaft; the synchronous shift device is installed on the intermediate shaft for switching the high-speed or low-speed power path.

[0009] According to an embodiment of the present invention, in the single-speed pure electric drive system of the drive motor, the electric driving gear is fixed to the drive motor rotor shaft and drives the rear drive output shaft through a single path of the electric driven gear and the low-speed driving gear.

[0010] According to an embodiment of the present invention, in the two-speed pure electric drive system of the generator, the power transmission path of the generator shares the high-speed driving gear and the low-speed and electric drive gear assembly with the two-speed engine drive system, and the gear shifting is controlled by the synchronous shift device.

[0011] According to one embodiment of the present invention, the single-speed pure electric drive system of the drive motor and the two-speed pure electric drive system of the generator constitute a dual-motor pure electric drive system.

[0012] According to an embodiment of the present invention, in the front-drive transfer system, the electromagnetic clutch is disposed at the end of the front-drive transfer shaft to control the engagement and disengagement of the front drive force.

[0013] According to one embodiment of the present invention, the hydraulically controlled wet clutch is eliminated and the engine driven driven gear is fixedly connected to the intermediate shaft, thereby forming a longitudinal four-wheel drive hybrid transmission without a generator and a two-speed drive function.

[0014] According to one embodiment of the present invention, the idler shaft and the front drive transfer shaft are eliminated to form a rear-wheel drive two-speed hybrid transmission.

[0015] According to one embodiment of the present invention, the drive motor and the electric drive driving gear are eliminated, and the rear-drive output shaft is replaced by the output shaft to form a single-motor longitudinal front-drive two-speed hybrid transmission.

[0016] According to one embodiment of the present invention, a front-wheel drive differential axle is also integrated, the front-wheel drive differential axle is provided with a spiral bevel gear driven gear, and the end of the front drive transfer shaft is provided with a spiral bevel gear driving gear, which meshes with the spiral bevel gear driven gear on the front-wheel drive differential axle to achieve front-wheel drive. The structure is suitable for achieving front-wheel drive for vehicles without an independent front-wheel drive axle, and the structure of the integrated front-wheel drive differential axle is suitable for all the above-mentioned hybrid solutions involved in the present invention.

[0017] Beneficial effects of the present invention: The present invention uses a coaxially arranged generator, engine and gear clutch transmission system to smoothly realize the hybrid power function of a vehicle with a longitudinally mounted engine and rear-wheel drive. The built-in front-drive transfer system ensures that the vehicle has a part-time four-wheel drive function; A hydraulically controlled wet clutch is set between the engine-driven driven gear and the intermediate shaft, which enables the generator to have the function of pure electric drive. This setting enables the transmission to have the ability of dual-motor pure electric drive, allowing the vehicle to burst out powerful pure electric drive force. Combined with the built-in front-wheel drive transfer system, the vehicle ensures that it has powerful off-road capabilities. The vehicle also does not need an external two-speed four-wheel drive transfer system, which greatly reduces the cost of the four-wheel drive hybrid assembly.

[0018] By controlling the opening and closing of the hydraulic wet clutch, the gear control of the hydraulic or electric control synchronous shift device, and the opening and closing of the electromagnetic clutch, functions such as engine start-stop, parking power generation, single-motor pure electric drive of the drive motor, dual-motor pure electric drive with two-speed pure electric drive of the generator, two-speed drive of the engine, rear-wheel drive, four-wheel drive, reverse, and braking energy recovery can be achieved. On the premise of ensuring the driving performance and power performance of the vehicle, the fuel economy of the vehicle is improved to meet the emission requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below in conjunction with the drawings and embodiments.

[0020] Figure 1 FIG. is a schematic structural diagram of Embodiment 1 (a longitudinally-mounted four-wheel drive two-speed hybrid transmission with a P2+P3 scheme) of the present invention.

[0021] Figure 2 FIG. is a schematic structural diagram of Embodiment 2 (a longitudinally-mounted four-wheel drive two-speed hybrid transmission with a P1+P3 scheme) of the present invention.

[0022] Figure 3 FIG. is a schematic structural diagram of Embodiment 3 (a longitudinally-mounted rear-wheel drive two-speed hybrid transmission with a P2+P3 scheme) of the present invention.

[0023] Figure 4 FIG. is a schematic structural diagram of Embodiment 4 (a longitudinally-mounted rear-wheel drive two-speed hybrid transmission with a P1+P3 scheme) of the present invention.

[0024] Figure 5 FIG. is a schematic structural diagram of Embodiment 5 (a longitudinally-mounted front-wheel drive two-speed hybrid transmission with a single P2 motor) of the present invention.

[0025] Figure 6 FIG. is a schematic structural diagram of Embodiment 6 (a longitudinally-mounted front-wheel drive two-speed hybrid transmission with a single P2 motor and a front-wheel drive differential drive axle) of the present invention.

[0026] In the figure: 1. Shock absorber; 2. Generator rotor shaft; 3. Driven gear for power generation; 4. Input shaft; 5. Driving active gear of the engine; 6. Intermediate shaft; 7. Driving active gear for power generation; 8. Driven gear of the engine drive; 9. Hydraulically controlled wet clutch; 10. Driving active gear for high gear; 11. Synchronous shift device; 12. Low gear and electric drive gear assembly; 13. Driving active gear for low gear; 14. Driven gear for electric drive; 15. Rear drive output shaft; 16. Driven gear for high gear drive; 17. Driven gear for low gear drive; 18. Rotor shaft of the drive motor; 19. Driving active gear for electric drive; 20. Idler shaft; 21. Idler gear; 22. Front drive transfer shaft; 23. Gear of the front drive transfer shaft; 24. Electromagnetic clutch; 25. Output shaft; 26. Spiral bevel driving gear; 27. Spiral bevel driven gear; 100. Engine; 200. Generator; 300. Drive motor; 400. Front-wheel drive differential drive axle. Detailed implementation manners

[0027] Now, the present invention will be further described in detail with reference to the accompanying drawings. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present invention in a schematic way, so they only show the components related to the present invention.

[0028] Before describing the structure and function of the first embodiment, the meanings of P1, P2, P3, and P4 in the embodiment naming and subsequent descriptions will be briefly explained.

[0029] These codes are the naming methods for motors in a hybrid transmission generally recognized in the automotive industry.

[0030] The P1 and P2 motors refer to the generators in the hybrid transmission. The P1 motor is directly connected or gear-driven to the engine drive input shaft, and the P1 motor cannot work independently of the engine. There is a clutch between the P2 motor and the engine drive input shaft. When the clutch is opened, the P2 motor can independently participate in vehicle driving.

[0031] The P3 and P4 motors refer to the drive motors. The P3 motor refers to the drive motor provided in the transmission, and the P4 motor is independent of the transmission and can independently drive the vehicle in pure electric mode, including the motor and the drive system.

[0032] In addition, Figures 1 to 6 in, ENG refers to the engine 100 of the vehicle; EM refers to the electric motor, EM1 represents the generator 200, and EM2 represents the drive motor 300; FWD refers to front-wheel drive; RWD refers to rear-wheel drive.

[0033] Such as Figure 1As shown in the figure, Embodiment 1 of a series hybrid transmission with a longitudinally mounted engine: a longitudinally mounted four-wheel drive two-speed hybrid transmission with a P2+P3 scheme, including a longitudinally mounted engine 100 with a shock absorber 1, as well as a generator 200 and a drive motor 300 coaxially arranged with the engine; it also includes a gear clutch transmission system, which includes: Shaft system: input shaft 4, intermediate shaft 6, rear drive output shaft 15, idler shaft 20, front drive transfer shaft 22; Transmission components: gears, bearings, clutches, synchronizers and other parts installed on various shafts; Functional subsystems: a. Power generation system: The engine on the input shaft 4 drives the driving gear 5 to mesh with the driven gear 8 of the engine on the intermediate shaft 6, and the power transmission is controlled by the hydraulic wet clutch 9 to the generator 200; b. Two-speed engine drive system: Select the high-speed drive driving gear 10 or the low-speed and electric drive gear assembly 12 through the synchronous shifter 11 to transmit the engine power to the rear drive output shaft 15; c. Drive motor single-speed pure electric drive system: The electric drive driving gear 19 meshes with the electric drive driven gear 14 fixed to the low-speed and electric drive gear assembly 12 to drive the rear drive output shaft 15; d. Two-speed pure electric drive system of the generator: When the hydraulic wet clutch 9 is disengaged, the power of the generator 200 is transmitted to the rear drive output shaft 15 through the intermediate shaft 6 by the synchronous shifter 11 to switch gears; e. Front drive transfer system: The idler 21 on the idler shaft 20 meshes with the low-speed drive driven gear 17 and the front drive transfer shaft gear 23, and the electromagnetic clutch 24 controls whether the power is output to the front drive transfer shaft 22.

[0034] The power generation system includes the input shaft 4, the intermediate shaft 6 and the generator rotor shaft 2; the input shaft 4 is provided with an engine drive driving gear 5; the intermediate shaft 6 is provided with an engine drive driven gear 8, a power generation driving gear 7 and a hydraulic wet clutch 9; the engine drive driven gear 8 meshes with the engine drive driving gear 5 on the input shaft 4; the hydraulic wet clutch 9 is used for connecting and separating the engine drive driven gear 8 and the intermediate shaft 6; the generator rotor shaft 2 is provided with a power generation driven gear 3, and the power generation driven gear 3 meshes with the power generation driving gear 7 on the intermediate shaft 6; when the hydraulic wet clutch 9 is closed, the power of the engine 100 drives the generator 200 to generate electricity through the shock absorber 1, the input shaft 4, the engine drive driving gear 5, the engine drive driven gear 8, the hydraulic wet clutch 9, the intermediate shaft 6, the power generation driving gear 7, the power generation driven gear 3 and the generator rotor shaft 2, constituting the power generation system.

[0035] The two-speed drive system of the engine includes an input shaft 4, a hydraulically controlled wet clutch 9, an intermediate shaft 6, and a rear drive output shaft 15. A high-speed drive driving gear 10, a synchronous shift device 11, and a low-speed and electric drive gear assembly 12 are also provided on the intermediate shaft 6. The synchronous shift device 11 is used to switch the power transmission path of the engine 100 to determine that the engine can achieve two-speed drive. The low-speed and electric drive gear assembly 12 is provided with a low-speed drive driving gear 13 and an electric drive driven gear 14. The rear drive output shaft 15 is provided with a high-speed drive driven gear 16 and a low-speed drive driven gear 17. The high-speed drive driven gear 16 meshes with the high-speed drive driving gear 10 on the intermediate shaft 6. The low-speed drive driven gear 17 meshes with the low-speed drive driving gear 13 on the low-speed and electric drive gear assembly 12. When the hydraulically controlled wet clutch 9 is closed, the power of the engine 100 passes through the shock absorber 1, the input shaft 4, the engine drive driving gear 5, the engine drive driven gear 8, the hydraulically controlled wet clutch 9, and the intermediate shaft 6. Then, according to the gear state of the synchronous shift device 11, it is determined whether the power of the engine 100 is transmitted to the rear drive output shaft 15 through the high-speed drive driving gear 10 and the high-speed drive driven gear 16, or through the low-speed drive driving gear 13 and the low-speed drive driven gear 17, thus forming the two-speed drive system of the engine.

[0036] The single-speed pure electric drive system of the drive motor includes a drive motor rotor shaft 18, an intermediate shaft 6, and a rear drive output shaft 15. An electric drive driving gear 19 is provided on the drive motor rotor shaft 18, and the electric drive driving gear 19 meshes with the electric drive driven gear 14 on the low-speed and electric drive gear assembly 12. The power of the drive motor drives the vehicle to travel through the drive motor rotor shaft 18, the electric drive driving gear 19, the electric drive driven gear 14 on the low-speed and electric drive gear assembly 12, the low-speed drive driving gear 13 on the low-speed and electric drive gear assembly 12, the low-speed drive driven gear 17, and the rear drive output shaft 15, thus forming the single-speed drive system of the drive motor.

[0037] The two-speed pure electric drive system of the generator includes a generator rotor shaft 2, an intermediate shaft 6, and a rear drive output shaft 15; O When the hydraulically controlled wet clutch 9 is opened, the power of the generator 200 passes through the generator rotor shaft 2, the power generation driven gear 3, the power generation driving gear 7, and the intermediate shaft 6. After that, its power transmission path and method are the same as those of the two-speed drive system of the engine, thus forming the two-speed drive system of the generator.

[0038] The single-speed pure electric drive system of the drive motor and the two-speed drive system of the generator together form the dual-motor pure electric drive system.

[0039] The front-wheel drive transfer system includes an idler shaft 20 and a front-wheel drive transfer shaft 22. An idler gear 21 is provided on the idler shaft 20; a front-wheel drive transfer shaft gear 23, an electromagnetic clutch 24 are provided on the front-wheel drive transfer shaft 22. The idler gear 21 meshes with both a low-speed drive driven gear 17 on the rear-wheel drive output shaft 15 and the front-wheel drive transfer shaft gear 23 on the front-wheel drive transfer shaft 22. The function of the idler gear 21 is to ensure that the rotation direction of the front-wheel drive transfer shaft 22 is the same as that of the rear-wheel drive output shaft 15 and to compensate for the problem of the large center distance between the rear-wheel drive output shaft 15 and the front-wheel drive transfer shaft 22. The electromagnetic clutch 24 is used to connect and disconnect the power transmission path of the front-wheel drive transfer shaft 22, realizing the part-time four-wheel drive function of the transmission. Compared with the hydraulic wet clutch 9, the electromagnetic clutch 24 can transmit a larger driving torque by relying on hard teeth and spline connections.

[0040] Embodiment 1: The working modes of a longitudinally-mounted four-wheel drive two-speed hybrid transmission with a P2+P3 scheme are as follows: Park and generate electricity: When the vehicle is in a stopped state, the synchronous shifter 11 is placed in the neutral position, and the hydraulic wet clutch 9 is closed. The power of the engine 100 passes through the shock absorber 1, the input shaft 4, the engine drive driving gear 5, the engine drive driven gear 8, the intermediate shaft 6, the power generation driving gear 7, the power generation driven gear 3, and the generator rotor shaft 2 to drive the generator 200 to generate electricity and charge the vehicle battery pack.

[0041] Single-motor pure electric drive by the drive motor: The synchronous shifter 11 is placed in the neutral position. The power of the drive motor 300 passes through the drive motor rotor shaft 18, the electric drive driving gear 19, the electric drive driven gear 14, the low-speed drive driving gear 13, the low-speed drive driven gear 17, and the rear-wheel drive output shaft 15 to drive the vehicle to travel. The electric power required for the single-motor pure electric drive by the drive motor comes from the vehicle battery pack.

[0042] Dual-motor pure electric drive: While the drive motor 300 performs single-motor pure electric drive, the generator 200 can also participate in vehicle drive. When the hydraulic wet clutch 9 is open, the power of the generator 200 passes through the generator rotor shaft 2, the driven gear 3 of the generator, the driving gear 7 of the generator, and the intermediate shaft 6. Then, depending on the vehicle speed, the driving gear of the generator 200 is determined. At lower vehicle speeds, the synchronizer 11 is placed in the low gear, and the power of the generator 200 drives the vehicle through the synchronizer 11, the low gear and the electric drive gear assembly 12, the driven gear 17 of the low gear drive, and the rear drive output shaft 15. At higher vehicle speeds, the synchronizer 11 is placed in the high gear, and the power of the generator 200 drives the vehicle through the synchronizer 11, the driving gear 10 of the high gear drive, the driven gear 16 of the high gear drive, and the rear drive output shaft 15. The generator 200 generally does not independently participate in vehicle drive, but only participates in vehicle drive when the vehicle requires higher driving power performance and the power of the drive motor 300 is insufficient. Dual-motor pure electric drive can make the vehicle burst out with powerful driving force and improve the off-road performance of the vehicle. The electric power required for dual-motor pure electric drive comes from the vehicle battery pack.

[0043] Range-extended drive: In the condition of the vehicle driving at a low speed or frequently stopping, to ensure the fuel economy of the vehicle, the range-extended drive condition can be entered. The synchronizer 11 is placed in the neutral state. While the power of the drive motor 300 drives the vehicle through the drive motor rotor shaft 18, the driving gear 19 of the electric drive, the driven gear 14 of the electric drive, the driving gear 13 of the low gear drive, the driven gear 17 of the low gear drive, and the rear drive output shaft 15, the power of the engine 100 drives the generator 200 to generate electricity through the shock absorber 1, the input shaft 4, the driving gear 5 of the engine drive, the driven gear 8 of the engine drive, the hydraulic wet clutch 9, the intermediate shaft 6, the driving gear 7 of the generator, the driven gear 3 of the generator, and the generator rotor shaft 2. During range-extended drive, part of the electric power required by the drive motor 300 comes from the vehicle battery pack, and part comes from the generator 200.

[0044] Engine start-stop: In the parking state, the start and stop of the engine 100 are controlled by the generator 200. The synchronizer 11 is placed in the neutral state, and the hydraulic wet clutch 9 is closed. The generator 200 controls the start and stop of the engine through speed control. The start and stop of the engine during vehicle driving are controlled by the hydraulic wet clutch 9. When the vehicle reaches a certain speed, the synchronizer 11 is placed in the appropriate gear according to the vehicle speed state and the hydraulic wet clutch 9 is closed, and the engine 100 is started by relying on the frictional torque of the hydraulic wet clutch 9. When the vehicle speed is lower than a certain speed, the engine 100 stops fuel supply and the hydraulic wet clutch 9 is opened, and the engine 100 stops working by itself.

[0045] Reverse: Vehicle reverse is generally implemented under the parking condition. The synchronous shift gear 11 is placed in the neutral state, and the drive motor 300 drives in reverse with a single motor. When a quick reverse is required, the hydraulic control wet clutch 9 is opened, and the generator 200 can also drive in reverse. In the range extender condition, it can only be driven in reverse by the drive motor 300 with a single motor.

[0046] Two-speed engine drive: When the vehicle reaches a speed suitable for engine drive and engine drive is required, the synchronous shift gear 11 is placed in the appropriate gear according to the vehicle speed state, and the hydraulic control wet clutch 9 is closed. The engine 100 is started using frictional torque. After the engine starts, it generally mainly drives with the engine 100, and the generator 200 and the drive motor 300 are placed in the idling state, or one of the motors is placed in the idling state, and the other motor makes the engine 100 always operate stably in the high-efficiency operation range through the adjustment of positive and negative torques.

[0047] Brake energy recovery: During the range extender condition of brake energy recovery during vehicle driving, it is implemented by converting the drive motor 300 into a power generation state. In the pure electric drive condition of the drive motor with a single motor, the two-speed drive condition of the two motors, and the two-speed drive condition of the engine, the generator 200 can also participate in brake energy recovery.

[0048] In the driving condition with low acceleration requirements, the front-wheel drive transfer case system generally does not participate in the work. The electromagnetic clutch 24 is placed in the open state, and the idler shaft 20 and the front-wheel drive transfer shaft 22 are in the idling state without torque transmission. All the torque power transmitted to the rear-wheel drive output shaft 15 drives the vehicle to travel through the rear-wheel drive output shaft 15, the rear-wheel axle differential, and the rear wheels. However, in the driving condition with high acceleration requirements or in the off-road condition, the driving torque that can be provided by the rear wheels alone cannot meet the vehicle driving needs. The transmission can be switched to the four-wheel drive state, and the electromagnetic clutch 24 on the front-wheel drive transfer shaft 22 is closed. The torque transmitted to the rear-wheel drive output shaft 15 will drive the vehicle to travel through the driven gear 17 in the low gear, the idler gear 21, the front-wheel drive transfer shaft gear 23, the front-wheel drive transfer shaft 22, the front-wheel axle differential, and the front wheels, and the vehicle enters the four-wheel drive driving condition.

[0049] Embodiment 2: A longitudinally-mounted four-wheel drive two-speed hybrid transmission with the P1+P3 scheme.

[0050] The difference from Embodiment 1 is that as Figure 2As shown in the figure, the hydraulic wet clutch 9 that connects the engine-driven driven gear 8 and the intermediate shaft 6 in the second embodiment is cancelled, and the engine-driven driven gear 8 is directly connected to the intermediate shaft 6. In this way, the generator rotor shaft 2 and the input shaft 4 are directly connected through two-stage gears. In this way, the generator 200 cannot work independently from the engine. Due to the cancellation of the hydraulic wet clutch 9, the transmission does not require a hydraulic system design, which can greatly reduce the production cost. Also due to the cancellation of the hydraulic wet clutch 9, the second embodiment does not have the function that needs the hydraulic wet clutch 9 to be opened in the first embodiment, that is, the two-speed driving function of the generator 200, that is, the second embodiment does not have the dual-motor pure electric driving function. In addition, the second embodiment has functions such as parking power generation, single-motor pure electric driving of the driving motor, range-extending driving, engine start-stop, two-speed driving of the engine, reverse, braking energy recovery, and four-wheel drive. Among them, the functions of reverse and braking energy recovery can only be completed by the driving motor 300. When the engine is in two-speed driving, the generator 200 can also participate in braking energy recovery.

[0051] Embodiment 3: A longitudinally-mounted rear-wheel drive two-speed hybrid transmission with a P2+P3 scheme.

[0052] The difference from Embodiment 1 is that as Figure 3 shown, on the basis of Embodiment 1, Embodiment 3 cancels the front-wheel drive transfer system including the idler shaft 20 and the front-wheel drive transfer shaft 22, and thus does not have the four-wheel drive function of Embodiment 1. In addition, Embodiment 3 has functions such as parking power generation, single-motor pure electric driving of the driving motor, dual-motor pure electric driving, range-extending driving, engine start-stop, two-speed driving of the engine, reverse, and braking energy recovery. The role played by the generator 200 during reverse and braking energy recovery is the same as that in Embodiment 1.

[0053] Embodiment 4: A longitudinally-mounted rear-wheel drive two-speed hybrid transmission with a P1+P3 scheme.

[0054] The difference from Embodiment 2 is that as Figure 4 shown, on the basis of Embodiment 2, Embodiment 4 cancels the front-wheel drive transfer system including the idler shaft 20 and the front-wheel drive transfer shaft 22, and thus does not have the four-wheel drive function of Embodiment 2. Therefore, this scheme has functions such as parking power generation, single-motor pure electric driving of the driving motor, range-extending driving, engine start-stop, two-speed driving of the engine, reverse, and braking energy recovery.

[0055] Embodiment 5: A longitudinally-mounted front-wheel drive two-speed hybrid transmission with a single P2 motor.

[0056] The difference between Embodiment 5 and Embodiment 1 is that as Figure 5As shown, in the fifth embodiment, based on the first embodiment, the drive motor 300 is cancelled. Naturally, the drive motor rotor shaft 18, the electric drive driving gear 19, and the electric drive driven gear 14 are also cancelled. The transmission no longer has all the functions that the drive motor 300 played in the first embodiment. In addition, the spline shaft for rear-wheel drive of the rear drive output shaft 15 is cancelled, and the output shaft 25 no longer has the rear-wheel drive function.

[0057] The significance of the fifth embodiment lies in that on the basis of the vehicle already having a rear-wheel P4 single-motor pure electric system, relying on the engine 100, the front-wheel hybrid drive is implemented. From another perspective, in the fifth embodiment, the drive motor 300 of the first embodiment is directly moved to the rear drive axle of the vehicle to independently complete the pure electric drive of the vehicle's rear wheels, and the remaining parts of the first embodiment are responsible for the front-wheel drive of the vehicle. Therefore, the fifth embodiment has functions such as parking power generation, range-extending drive, engine start-stop, two-speed engine drive, reverse, and braking energy recovery. Cooperating with the rear-wheel P4 pure electric drive system, the vehicle has the functions of four-wheel pure electric drive, range-extending drive, and four-wheel hybrid drive.

[0058] The sixth embodiment: A P2 single-motor longitudinally-mounted front-wheel drive two-speed hybrid transmission with a front-wheel drive differential drive axle.

[0059] The difference between the sixth embodiment and the fifth embodiment is that in the fifth embodiment, when the vehicle is equipped with a front-wheel drive differential drive axle 400, the front-wheel drive transfer shaft 22 only needs to be connected to the spline or flange of the vehicle's front-wheel drive differential drive axle. If the vehicle does not have a built-in front-wheel drive differential drive axle, the transmission can be equipped with a front-wheel drive differential drive axle itself to reduce the vehicle's design and manufacturing costs.

[0060] The sixth embodiment is based on the fifth embodiment, and a front-wheel drive differential drive axle 400 is added to the transmission. A spiral bevel gear driven gear 27 is provided on the front-wheel drive differential drive axle 400, and a spiral bevel gear driving gear 26 is provided on the front-wheel drive transfer shaft 22, which meshes with the spiral bevel gear driven gear 27 on the front-wheel drive differential drive axle 400.

[0061] In addition to having the function of front-wheel differential drive, the other functions of the sixth embodiment and the fifth embodiment are exactly the same.

[0062] The structure of the transmission of the sixth embodiment with a self-contained front-wheel drive differential system is also applicable to the first and second embodiments.

[0063] Enlightened by the above ideal embodiments of the present invention, through the above description, relevant staff can completely make various changes and modifications within the scope not deviating from the technical idea of this invention. The technical scope of this invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A series hybrid power transmission with a longitudinal engine, characterized in that: include: A power source, comprising a longitudinally mounted engine (100) with a shock absorber (1), and a generator (200) and a drive motor (300) coaxially arranged with the engine (100); A gear clutch transmission system comprising: Shaft system: input shaft (4), intermediate shaft (6), rear drive output shaft (15), idler shaft (20), front drive transfer shaft (22); Transmission components: gears, bearings, clutches and synchronizers installed on each shaft. Functional subsystem: a. Power generation system: The engine-driven driving gear (5) on the input shaft (4) meshes with the engine-driven driven gear (8) on the intermediate shaft (6), and the power is transmitted to the generator (200) through the hydraulically controlled wet clutch (9); b. Two-speed engine drive system: selects high-speed gear to drive the driving gear (10) or low-speed gear and electric drive gear assembly (12) through the synchronous shifter (11), and transmits the engine power to the rear drive output shaft (15); c. A single-speed pure electric drive system of a driving motor: the electric drive driving gear (19) is meshed with the electric drive driven gear (14) fixedly connected to the low-speed gear assembly (12), thereby driving the rear drive output shaft (15); d. Generator two-speed pure electric drive system: when the hydraulically controlled wet clutch (9) is disconnected, the power of the generator (200) is transmitted to the rear drive output shaft (15) through the intermediate shaft (6) by the synchronous shifter (11) switching the gear; e. Front drive transfer system: The idler gear (21) on the idler shaft (20) engages the low-speed drive driven gear (17) and the front drive transfer shaft gear (23), and controls whether the power is output to the front drive transfer shaft (22) through the electromagnetic clutch (24).

2. The longitudinally mounted engine series hybrid transmission according to claim 1, characterized in that: In the power generation system, a hydraulically controlled wet clutch (9) is arranged on the intermediate shaft (6) and is used to connect or disconnect the engine driven driven gear (8) and the intermediate shaft (6); the power generation driven gear (3) on the generator rotor shaft (2) is meshed with the power generation driving gear (7) on the intermediate shaft (6).

3. The longitudinally mounted engine series hybrid transmission according to claim 1, characterized in that: In the two-speed engine drive system, a high-speed drive driving gear (10) meshes with a high-speed drive driven gear (16) on a rear-drive output shaft (15); the low-speed and electric drive gear assembly (12) connects the low-speed drive driving gear (13) and the electric drive driven gear (14), and meshes with the low-speed drive driven gear (17) of the rear-drive output shaft (15); and the synchronous shifter (11) is mounted on an intermediate shaft (6) and is used to switch the high-speed or low-speed power path.

4. The longitudinally mounted engine series hybrid transmission according to claim 1, characterized in that: In the single-speed pure electric drive system of the drive motor, the electric drive driving gear (19) is fixed to the drive motor rotor shaft (18), and drives the rear drive output shaft (15) through a single path of the electric drive driven gear (14) and the low-speed drive driving gear (13).

5. The longitudinally mounted engine series hybrid transmission according to claim 1, characterized in that: In the generator two-speed pure electric drive system, the power transmission path of the generator (200) shares the high-speed drive active gear (10) and the low-speed and electric drive gear assembly (12) with the engine two-speed drive system, and the gear switching is controlled by the synchronous shifter (11).

6. The longitudinally mounted engine series hybrid transmission according to claim 4 or 5, characterized in that: The single-speed pure electric drive system of the drive motor and the two-speed pure electric drive system of the generator constitute a dual-motor pure electric drive system.

7. The longitudinally mounted engine series hybrid transmission according to claim 1, characterized in that: In the front drive transfer system, an electromagnetic clutch (24) is arranged at the end of the front drive transfer shaft (22) and is used to control the engagement and disengagement of the front drive force.

8. The longitudinally mounted engine series hybrid transmission according to claim 1, characterized in that: The hydraulically controlled wet clutch (9) is eliminated and the engine driven driven gear (8) is fixedly connected to the intermediate shaft (6), thereby forming a longitudinal four-wheel drive hybrid transmission without a generator two-speed drive function.

9. The longitudinally mounted engine series hybrid transmission according to claim 1, characterized in that: The idler shaft (20) and the front drive transfer shaft (22) are eliminated to form a rear-wheel drive two-speed hybrid transmission.

10. The longitudinally mounted engine series hybrid transmission according to claim 1, characterized in that: The drive motor (300) and the electric drive driving gear (19) are eliminated, and the rear drive output shaft (15) is replaced with an output shaft (25), thereby forming a single-motor longitudinal front-drive two-speed hybrid transmission.

11. The longitudinally mounted engine series hybrid transmission according to claim 1 or 7, characterized in that: A front-wheel drive differential drive axle (400) is also integrated, the front-wheel drive differential drive axle (400) is provided with a spiral bevel gear driven gear (27), and the end of the front-drive transfer shaft (22) is provided with a spiral bevel gear driving gear (26) which meshes with the spiral bevel gear driven gear (27) on the front-wheel drive differential drive axle (400) to achieve front-wheel drive.

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