Front-wheel drive single-motor hybrid power gearbox and hydraulic cooling and lubricating system

Abstract

The invention relates to the technical field of hybrid power gearboxes, in particular to a front-wheel driving single-motor hybrid power gearbox and a hydraulic cooling and lubricating system, which are constructed on the basis that a vehicle is provided with a rear-wheel pure electric driving system. The system comprises two power sources, namely a generator and an engine, a gear transmission system and a clutch system for transmitting power of the two power sources, and a hydraulic system and a cooling and lubricating system for assisting the generator, the gear transmission system and the clutch system to work, a clutch system is composed of two clutches, opening and closing control of the first clutch determines separation and connection of engine power, and opening and closing control of the second clutch determines whether power of two power sources participates in vehicle driving or not. A rear wheel pure electric driving system is matched, four-wheel pure electric driving and four-wheel hybrid driving are achieved, and the dynamic property and off-road performance of the vehicle are improved; according to the modular design scheme, the same-platform development of multiple types of hybrid power gearboxes with different functions is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of hybrid power transmissions, and in particular to a front-wheel drive single-motor hybrid power transmission and a hydraulic cooling and lubrication system. Background Art

[0002] With the rapid growth of the global automobile ownership, the pressure on energy, environment, safety and other aspects is increasing, which has accelerated the global automobile energy conservation and electrification process. Faced with the industry bottlenecks such as the range anxiety 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.

[0003] 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 vehicle's power performance under multiple operating conditions by real-time control of the power coupling between the engine and the electric motor.

[0004] Some medium and large SUVs, MPVs and pickup trucks are large and heavy, and traditional fuel vehicles mostly use rear-wheel drive. These types of vehicles generally use rear-wheel pure electric drive solutions on the road to electrification, and their hybrid routes mostly use front-mounted range extenders or front-mounted dual-motor extended-range hybrid transmission solutions. However, the front-mounted range extender cannot achieve the vehicle's four-wheel drive, and the vehicle's power is seriously insufficient; the front-mounted dual-motor extended-range hybrid transmission can achieve the vehicle's four-wheel pure electric drive, but the engine cannot participate in the drive, which also leads to its insufficient fuel economy at high speeds, and the dual motors plus dual motor controllers also lead to high transmission costs. Vehicles with rear-wheel pure electric drive generally have larger battery packs and can be recharged. On the basis that the engine can participate in the drive, the demand for generator power generation is not high.

[0005] Therefore, developing a single-motor hybrid transmission with a simple structure, light weight, low manufacturing cost, and in which both the generator and the engine can participate in driving has become an urgent problem that needs to be solved. Summary of the invention

[0006] The technical problem to be solved by the present invention is: in order to solve the problems existing in the prior art in the above-mentioned background technology, a front-wheel drive single-motor hybrid power transmission and a hydraulic cooling and lubrication system are provided.

[0007] The technical solution adopted by the present invention to solve the technical problem is: a front-wheel drive single-motor hybrid power transmission and a hydraulic cooling and lubrication system, comprising: Power sources, including generators and engines, A gear transmission system is used to transmit the power of the power source, which includes a generator driven gear arranged on the generator gear shaft, a hybrid drive driving gear arranged on the input shaft and meshing with the generator driven gear, and a hybrid drive driven gear installed on the hybrid drive output shaft and meshing with the hybrid drive driving gear, and the hybrid drive output shaft is also equipped with a main reduction driving gear) and a main reduction driven gear installed on the differential and meshing with the main reduction driving gear, The clutch system includes a first clutch coaxial with the engine and connecting the input flange and the input shaft, and a second clutch mounted on the hybrid drive output shaft and connecting the hybrid drive driven gear and the hybrid drive output shaft. Cooling and lubrication system, used to cool and lubricate the generator, gear transmission system and clutch system, The hydraulic system is used to control the opening and closing of the two clutches in the clutch system, realize the separation and connection of engine power, and determine whether the power of the two power sources is involved in vehicle driving.

[0008] Further, the power generation driven gear is arranged on the generator gear shaft, and the generator gear shaft is spline-connected with the generator rotor shaft; the hybrid drive driving gear is arranged on the input shaft; the input shaft is coaxially arranged with the input flange and connected through a first clutch; the input flange is spline-connected with the engine through a shock absorber; and a second clutch is arranged on the hybrid drive output shaft; When the first clutch is closed and the second clutch is opened, the power of the engine drives the generator to generate electricity through the shock absorber, input flange, first clutch, input shaft, hybrid drive driving gear, generator driven gear, generator gear shaft, and generator rotor shaft, entering the engine driven generator power generation mode.

[0009] Further, the hybrid drive output shaft is provided with a hybrid drive driven gear and a second clutch, and the hybrid drive driven gear is connected to the hybrid drive output shaft via the second clutch; When the first clutch is open and the second clutch is closed, the power of the generator drives the vehicle through the generator rotor shaft, the generator gear shaft, the generator driven gear, the hybrid drive driving gear, the hybrid drive driven gear, the second clutch, the hybrid drive output shaft, the main reduction driving gear, the main reduction driven gear, and the differential, entering the generator single-gear drive mode.

[0010] Furthermore, when the first clutch and the second clutch are both closed, the power of the engine drives the vehicle through the shock absorber, input flange, first clutch, input shaft, hybrid drive driving gear, hybrid drive driven gear, second clutch, hybrid drive output shaft, main reduction driving gear, main reduction driven gear, and differential, and enters the engine single-speed drive system.

[0011] Furthermore, the first clutch is arranged between the input shaft and the input flange, and includes a clutch inner hub, a clutch friction plate, a clutch steel plate, a clutch outer hub with a retaining ring, a clutch piston, a clutch return spring and a clutch return spring baffle. The clutch inner hub is welded to the input flange and is slidingly splined to the clutch friction plate; the clutch outer hub with a retaining ring is welded to the hybrid drive driving gear and is slidingly splined to the clutch steel plate; the clutch piston is arranged in the space between the input shaft and the hybrid drive driving gear, and is slidingly connected to the input shaft and the hybrid drive driving gear through the inner and outer diameters; the first clutch hydraulic working chamber is formed between the input shaft, the hybrid drive driving gear and the clutch piston.

[0012] Furthermore, the second clutch is located at the motor side end of the hybrid drive output shaft, and includes a clutch inner hub, a clutch friction plate, a clutch steel plate, a clutch outer hub with a retaining ring, a clutch piston, a clutch return spring, a clutch return spring baffle and a clutch outer hub support. The clutch inner hub is welded to the hybrid drive driven gear and is slidingly connected to the clutch friction plate. The clutch outer hub with a retaining ring is welded to the clutch outer hub support and is slidingly connected to the clutch steel plate. The clutch outer hub support is splined to the hybrid drive output shaft. The clutch piston is installed in the space formed by the clutch outer hub support and is slidingly connected to the clutch outer hub support through the inner and outer diameters. A second clutch piston hydraulic working chamber is formed between the clutch outer hub support and the clutch piston.

[0013] Furthermore, the hydraulic system includes a high-pressure oil pump, a first clutch solenoid valve and a high-pressure oil circuit, and a second clutch solenoid valve and a high-pressure oil circuit.

[0014] When the first clutch solenoid valve and the high-pressure oil circuit are at high pressure, the high-pressure lubricating oil enters the hydraulic working chamber of the first clutch through the central oil hole at the left end of the input shaft to drive the clutch piston to move in the piston space formed by the input shaft and the hybrid drive active gear, thereby realizing the closing of the first clutch; when the first clutch solenoid valve and the high-pressure oil circuit are at low pressure, the clutch return spring returns the clutch piston to realize the opening of the first clutch.

[0015] When the second clutch solenoid valve and the high-pressure oil circuit are at high pressure, the high-pressure lubricating oil enters the hydraulic working chamber of the second clutch through the center hole at the left end of the hybrid drive output shaft to drive the clutch piston to move in the piston space of the clutch outer hub support, thereby realizing the closing of the second clutch; when the second clutch solenoid valve and the high-pressure oil circuit are at low pressure, the clutch return spring returns the clutch piston to realize the opening of the second clutch.

[0016] Furthermore, the cooling and lubricating system comprises a low-pressure oil pump, an oil cooler, a cooling and lubricating oil circuit, a generator stator cooling oil pipe and high- and low-pressure connecting oil circuits. The low-pressure oil pump pumps out the lubricating oil at the bottom of the gearbox and enters the oil cooler fixed on the outside of the gearbox housing through the housing oil passage. The vehicle's water cooling facility provides cooling water to perform heat exchange in the oil cooler to cool the lubricating oil, and the cooled lubricating oil is circulated into the gearbox housing and transported to all operating and heating parts in the gearbox through the cooling and lubricating oil circuit in the gearbox housing. The main oil circuit of the cooling and lubricating oil circuit is arranged in the gearbox housing on the engine side, and the oil cooler is fixed on the outside of the gearbox housing. The generator stator cooling oil pipe guides the lubricating oil of the cooling lubricating oil circuit to the upper part of the stator of the generator, and sprays it to the part of the stator of the generator that needs to be cooled; The high- and low-pressure connecting oil circuit includes a switch valve and a relief valve. When the clutch is not working, the first clutch solenoid valve and the high-pressure oil circuit and the second clutch solenoid valve and the high-pressure oil circuit both require low pressure, the switch valve of the high- and low-pressure connecting oil circuit is opened, and the lubricating oil in the high-pressure oil circuit enters the cooling lubricating oil circuit as a supplement to the cooling lubricating oil circuit. When the generator and the engine need to work, at least one of the first clutch solenoid valve and the high-pressure oil circuit and the second external clutch solenoid valve and the high-pressure oil circuit requires high-pressure oil, the switch valve of the high- and low-pressure connecting oil circuit is closed, and the excess high-pressure oil generated by the continuous operation of the high-pressure oil pump enters the low-pressure oil circuit through the relief valve of the high- and low-pressure connecting oil circuit.

[0017] Furthermore, the second clutch is a dual-clutch structure consisting of an inner clutch and an outer clutch, the input shaft is also equipped with a hybrid drive second driving gear, and the hybrid drive output shaft is also equipped with a hybrid drive second driven gear; that is, a hybrid power transmission is formed in which both the generator and the engine can be driven in two gears.

[0018] The inner clutch comprises an inner clutch inner hub, an inner clutch friction plate, an inner clutch steel plate, an inner clutch piston, an inner clutch return spring, an inner clutch return spring baffle, a clutch intermediate hub with inner and outer snap rings, and a clutch intermediate hub support; the outer clutch comprises a clutch intermediate hub with inner and outer snap rings, a clutch intermediate hub support, an outer clutch outer hub, an outer clutch friction plate, an outer clutch steel plate, an outer clutch piston, an outer clutch piston support, an outer clutch return spring, and an outer clutch return spring baffle; the clutch intermediate hub with inner and outer snap rings and the clutch intermediate hub support are common parts of the inner clutch and the outer clutch; The inner hub of the inner clutch is welded to the hybrid drive driven gear, and is connected to the inner clutch friction plate by sliding splines; the clutch intermediate hub with inner and outer retaining rings is welded to the clutch intermediate hub support, and is connected to the inner clutch steel plate and the outer clutch steel plate by sliding splines; the clutch intermediate hub support is splined to the hybrid drive output shaft; the inner clutch piston is installed in the space formed by the clutch intermediate hub support and is connected to the clutch intermediate hub support by sliding through the inner and outer diameters; the inner clutch piston hydraulic working chamber is formed between the clutch intermediate hub support and the inner clutch piston; The outer hub of the external clutch is welded to the second driven gear of the hybrid drive, and is slidingly splined to the external clutch friction plate. The external clutch piston is arranged in the space of the external clutch piston support, and is slidingly matched with the external clutch piston support through the inner and outer diameters. The external clutch piston support is splined to the hybrid drive output shaft, and an external clutch piston hydraulic working chamber is formed between the external clutch piston and the external clutch piston support.

[0019] Furthermore, the hydraulic system of the two-speed drive hybrid transmission includes a high-pressure oil pump, a first clutch solenoid valve and a high-pressure oil circuit, an inner clutch solenoid valve and a high-pressure oil circuit, and an outer clutch solenoid valve and a high-pressure oil circuit. When the inner clutch solenoid valve and the high-pressure oil circuit are at high pressure, the high-pressure oil enters the inner clutch hydraulic working chamber through the left end center hole of the hybrid drive output shaft, and the hydraulic pressure pushes the inner clutch piston to move in the piston space of the clutch intermediate hub support to achieve the closing of the inner clutch; when the inner clutch solenoid valve and the high-pressure oil circuit are at low pressure, the inner clutch return spring returns the inner clutch piston to achieve the opening of the inner clutch; When the external clutch solenoid valve and the high-pressure oil circuit are under high pressure, the hydraulic oil enters the eccentric hole closed at one end through the outer diameter of the hybrid drive output shaft and then enters the hydraulic working chamber of the external clutch. The hydraulic pressure pushes the external clutch piston to move to achieve the closing of the external clutch; when the external clutch solenoid valve and the high-pressure oil circuit are under low pressure, the external clutch return spring returns the external clutch piston to achieve the opening of the external clutch.

[0020] Beneficial effects of the present invention: On the one hand, the invention can realize the four-wheel pure electric drive of the generator single / two-speed drive and the four-wheel hybrid drive of the engine single / two-speed drive on the basis of the vehicle already having a rear-wheel pure electric drive system, which can greatly improve the pure electric drive power of the vehicle and the fuel economy of the vehicle under high-speed driving conditions; on the other hand, the reasonable hydraulic and cooling lubrication scheme makes the transmission structure simpler, and the single motor plus the single motor controller can make the transmission cost lower; at the same time, the modular design scheme of each functional system can realize the development of multiple hybrid transmissions with different functions on the same platform; The present invention integrates coordinated control of the single motor controller, transmission controller and hybrid system controller to realize engine start-stop, parking power generation, extended-range drive, four-wheel pure electric drive, four-wheel hybrid drive and other functions, while reversing and brake energy recovery are implemented by the rear wheel pure electric drive, and the generator can also participate in brake energy recovery when participating in driving. Ultimately, the vehicle's fuel economy is improved to meet emission regulations. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0022] Figure 1 is a schematic structural diagram of Embodiment 1 of the present invention; Figure 2 It is a structural diagram of embodiment 2 of the present invention.

[0023] Figure 3 yes Figure 2 Schematic diagram of the enlarged structure at I in the middle.

[0024] In the figure: 1. shock absorber; 2. input flange; 3. input shaft; 4. hybrid drive driving gear; 5. generator gear shaft; 6. generator driven gear; 7. generator rotor shaft; 8. hybrid drive output shaft; 9. hybrid drive driven gear; 10. main reduction driving gear; 11. differential; 12. main reduction driven gear; 13. clutch inner hub; 14. clutch friction plate; 15. clutch steel plate; 16. clutch outer hub with retaining ring; 17. clutch piston; 18. clutch return spring; 19. clutch return spring baffle; 20. clutch outer hub support; 21. high-pressure oil pump; 22. first clutch solenoid valve and high-pressure oil circuit; 23. second clutch solenoid valve and high-pressure oil circuit; 32. Inner clutch inner hub; 33. Inner clutch friction plate; 34. Inner clutch steel plate; 35. Inner clutch piston; 36. Inner clutch return spring; 37. Inner clutch return spring baffle; 38. Clutch intermediate hub with inner and outer snap rings; 39. Clutch intermediate hub support; 310. Outer clutch outer hub; 311. Outer clutch friction plate; 312. Outer clutch steel plate; 313. Outer clutch piston; 314. Outer clutch piston support; 315. Outer clutch return spring; 316. Outer clutch return spring baffle; 40. Hybrid drive second driven gear; 41. Hybrid drive second driving gear; 42. Inner clutch solenoid valve and high-pressure oil circuit; 43. Outer clutch solenoid valve and high-pressure oil circuit; 44. Low-pressure oil pump; 45. Oil cooler; 46. Cooling lubricating oil circuit; 47. Generator stator cooling oil pipe; 48. High and low pressure connecting oil circuits; 100, generator; 200, engine; 400, first clutch; 500, second clutch; 501, inner clutch; 502, outer clutch. DETAILED DESCRIPTION

[0025] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0026] Embodiment 1 like Figure 1 As shown, a front-wheel drive single-motor hybrid power transmission and hydraulic cooling and lubrication system is a front-wheel drive single-motor single-speed hybrid power transmission formed together with a front engine on the basis of a vehicle having rear-wheel pure electric drive, realizing single-speed four-wheel pure electric drive and single-speed four-wheel hybrid drive of the whole vehicle, specifically including two power sources, a generator 100 and an engine 200 with a shock absorber 1, a gear transmission system connecting the two power sources and transmitting the power of the two power sources, a clutch system, a hydraulic system assisting the clutch, and a cooling and lubrication system providing cooling and lubrication for the motor and the gear transmission system. The gear transmission system controls the opening and closing of the clutch through the hydraulic system to realize the output of the power of the engine 200, and whether the power of the engine 200 and the generator 100 is transmitted to the output end of the transmission; the cooling and lubrication system realizes the cooling of the generator 100 and the cooling and lubrication of the gear transmission system; the gear transmission system, the clutch system and the power source can enable the transmission to enter the engine-driven generator power generation mode, the generator single-speed drive mode and the engine single-speed drive mode.

[0027] Engine driven generator power generation mode: The engine 200 provides power, the power generation driven gear 6 is arranged on the generator gear shaft 5, the generator gear shaft 5 is splined to the generator rotor shaft 7, the power generation driven gear 6 is meshed with the hybrid drive driving gear 4 arranged on the input shaft 3, the input shaft 3 is coaxially arranged with the input flange 2 and connected through the first clutch 400, the input flange 2 is splined to the shock absorber 1 on the engine 200G, and the second clutch 500 is arranged on the hybrid drive output shaft 8. When the first clutch 400 is closed and the second clutch 500 is opened, the power of the engine 200 drives the generator 100 to generate electricity through the shock absorber 1, the input flange 2, the first clutch 400, the input shaft 3, the hybrid drive driving gear 4, the power generation driven gear 6, the generator gear shaft 5, and the generator rotor shaft 7.

[0028] Generator single gear driving mode: the generator 100 provides power, the hybrid drive output shaft 8 is provided with a hybrid drive driven gear 9 and a second clutch 500, the hybrid drive driven gear 9 is connected to the hybrid drive output shaft 8 through the second clutch 500, the hybrid drive driven gear 9 is meshed with the hybrid drive driving gear 4 provided on the input shaft 3, the hybrid drive output shaft 8 is also provided with a main reduction driving gear 10, and the main reduction driving gear 10 is meshed with the main reduction driven gear 12 on the differential 11. When the first clutch 400 is open and the second clutch 500 is closed, the power of the generator 100 drives the vehicle to travel through the generator rotor shaft 7, the generator gear shaft 5, the generator driven gear 6, the hybrid drive driving gear 4, the hybrid drive driven gear 9, the second clutch 500, the hybrid drive output shaft 8, the main reduction driving gear 10, the main reduction driven gear 12, and the differential 11.

[0029] Engine single-gear driving mode: The engine 200 provides power. When the first clutch 400 and the second clutch 500 are both closed, the power of the engine 200 drives the vehicle to travel through the shock absorber 1, the input flange 2, the first clutch 400, the input shaft 3, the hybrid drive driving gear 4, the hybrid drive driven gear 9, the second clutch 500, the hybrid drive output shaft 8, the main reduction driving gear 10, the main reduction driven gear 12, and the differential 11.

[0030] In this embodiment, the hybrid drive driving gear 4 arranged on the input shaft 3 has the functions of power generation, engine single-speed driving driving gear and generator single-speed driving intermediate idler gear.

[0031] The first clutch 400 is arranged between the input shaft 3 and the input flange 2. The first clutch 400 is composed of a clutch inner hub 13, a clutch friction plate 14, a clutch steel plate 15, a clutch outer hub 16 with a retaining ring, a clutch piston 17, a clutch return spring 18, and a clutch return spring baffle 19. The clutch inner hub 13 is welded to the input flange 2 and is also connected to the clutch friction plate 14 by sliding splines. The clutch outer hub 16 with a retaining ring is welded to the hybrid drive driving gear 4 and is also connected to the clutch steel plate 15 by sliding splines. The clutch piston 17 is arranged in the space between the input shaft 3 and the hybrid drive driving gear 4 and is slidably connected to the input shaft 3 and the hybrid drive driving gear 4 through the inner and outer diameters. The first clutch hydraulic working chamber is formed between the input shaft 3, the hybrid drive driving gear 4, and the clutch piston 17. The first clutch 400 is controlled by the first clutch solenoid valve and the high-pressure oil circuit 22; when the first clutch solenoid valve and the high-pressure oil circuit 22 are at high pressure, the high-pressure lubricating oil drives the clutch piston 17 to move in the piston space formed by the input shaft 3 and the hybrid drive active gear 4, thereby closing the first clutch 400; when the first clutch solenoid valve and the high-pressure oil circuit 22 are at low pressure, the clutch return spring 18 returns the clutch piston 17 to open the first clutch 400.

[0032] The second clutch 500 is arranged on the hybrid drive output shaft 8, and is located at the motor side end of the hybrid drive output shaft 8. The second clutch 500 is composed of a clutch inner hub 13, a clutch friction plate 14, a clutch steel plate 15, a clutch outer hub 16 with a retaining ring, a clutch piston 17, a clutch return spring 18, a clutch return spring retaining plate 19, and a clutch outer hub support 20. Except for the clutch outer hub support 20, other clutch parts are common to the first clutch 400, or have slight adjustments due to structural reasons; the clutch inner hub 13 is welded and connected to the hybrid drive driven gear 9, and is slidably connected to the clutch friction plate 14; the clutch outer hub 16 with a retaining ring is welded and connected to the clutch outer hub support 20, and is slidably connected to the clutch steel plate 15; the clutch outer hub support 20 is splined to the hybrid drive output shaft 8; the clutch piston 17 is installed in the space formed by the clutch outer hub support 20 and is slidably connected to the clutch outer hub support 20 through the inner and outer diameters, and the second clutch piston hydraulic working chamber is formed between the clutch outer hub support 20 and the clutch piston 17. The second clutch 500 is controlled by the second clutch solenoid valve and the high-pressure oil circuit 23. When the second clutch solenoid valve and the high-pressure oil circuit 23 are at high pressure, the high-pressure lubricating oil drives the clutch piston 17 to move in the piston space of the clutch outer hub support 20, thereby realizing the closing of the second clutch 500; when the second clutch solenoid valve and the high-pressure oil circuit 23 are at low pressure, the clutch return spring 18 returns the clutch piston 17, thereby realizing the opening of the second clutch 500.

[0033] The arrangement order of parts on the coaxially arranged input shaft 3 and input flange 2 from the engine side to the motor side is shock absorber 1, input flange 2, first clutch 400, input shaft 3, hybrid drive driving gear 4. The arrangement order of parts on the hybrid drive output shaft 8 from the engine side to the motor side is main reduction driving gear 10, hybrid drive driven gear 9, second clutch 500.

[0034] In this embodiment, the hydraulic system includes a high-pressure oil pump 21 and a first clutch solenoid valve and a high-pressure oil circuit 22 for controlling the operation of the first clutch 400, and a second clutch solenoid valve and a high-pressure oil circuit 23 for controlling the operation of the second clutch 500. The hydraulic system is arranged on the gearbox housing on the two motor sides.

[0035] In this embodiment, the cooling and lubricating system includes a low-pressure oil pump 44, an oil cooler 45, a cooling and lubricating oil circuit 46, a generator stator cooling oil pipe 47 and a high-low pressure connecting oil circuit 48. The low-pressure oil pump 44 pumps out the lubricating oil at the bottom of the gearbox, and enters the oil cooler 45 fixed on the outside of the gearbox housing through the housing oil passage. The vehicle's water cooling facilities provide cooling water to perform heat exchange in the oil cooler 45 to cool the lubricating oil, and the cooled lubricating oil is circulated into the gearbox and transported to all operating and heating parts in the gearbox through the cooling and lubricating oil circuit 46 in the gearbox. The main oil circuit of the cooling and lubricating oil circuit 46 is set in the gearbox housing on the engine 200 side, and the oil cooler 45 is fixed on the outside of the gearbox housing. The generator stator cooling oil pipe 47 guides the lubricating oil in the cooling and lubricating oil circuit 46 to the upper part of the stator of the generator 100, and sprays it to the part of the stator of the generator 100 that needs to be cooled. The high- and low-pressure connecting oil circuit 48 includes a switch valve and a relief valve. The first clutch solenoid valve and the high-pressure oil circuit 22, the second clutch solenoid valve and the high-pressure oil circuit 23 all require low pressure. The switch valve of the high- and low-pressure connecting oil circuit 48 is opened, and the lubricating oil in the high-pressure oil circuit enters the cooling and lubricating oil circuit as a supplement to the cooling and lubricating oil circuit. When the clutch is working, at least one of the first clutch solenoid valve and the high-pressure oil circuit 22 and the second clutch solenoid valve and the high-pressure oil circuit 23 requires high-pressure oil, then the switch valve of the high- and low-pressure connecting oil circuit 48 is closed, and the excess high-pressure oil generated by the continuous operation of the high-pressure oil pump enters the low-pressure oil circuit through the relief valve of the high- and low-pressure connecting oil circuit 48.

[0036] In this embodiment, the cooling lubrication of the gear system includes the cooling lubrication of the input flange 2, the input shaft 3, the generator gear shaft 5 and the generator rotor shaft 7 splined therewith, and the hybrid drive output shaft 8. These five shafts are all hollow shafts, and the lubricating oil required for the cooling lubrication of the running parts on the five shafts and the two motor rotors is introduced through the cooling lubricating oil circuit 46; the input shaft 3 and the hybrid drive output shaft 8 are composed of holes that are not connected to each other at both ends. The left end hole leads to high-pressure oil that controls the operation of the two clutches, and the right end hole leads to lubricating oil that provides cooling lubrication for the clutch and wheel axle parts.

[0037] In addition, there are many options for the high-pressure oil pump 21 and the low-pressure oil pump 44: a high-low pressure double electronic pump, a split electronic pump, a gear mechanical pump, or a combination of a gear mechanical pump and an electronic pump. When the high-pressure oil pump 21 uses a gear mechanical pump, it should be set on the input shaft 3 or meshed with the hybrid drive driving gear 4 on the input shaft 3 and the power generation driven gear 6 or the hybrid drive driven gear 9 meshed therewith; when the low-pressure oil pump 44 uses a gear mechanical pump, it should be considered to be set on the hybrid drive output shaft 8, or it can be meshed with the main reduction driving gear 10 or the main reduction driven gear 12.

[0038] The first clutch 400 and the second clutch 500 can be replaced by electromagnetic clutches. If the electromagnetic clutches are used, the high-pressure oil pump 21 and all the electromagnetic valves and high-pressure oil circuits for controlling the operation of the clutches can be cancelled.

[0039] The working modes of the front-wheel drive single-motor hybrid gearbox and hydraulic cooling and lubrication system of this embodiment are as follows: Parking power generation: When the vehicle is stopped, the first clutch 400 is closed and the second clutch 500 is opened. After the engine 200 is started using the power of the generator 100, the power of the engine 200 drives the generator 100 to generate electricity through the shock absorber 1, the input flange 2, the first clutch 400, the input shaft 3, the hybrid drive driving gear 4, the power generation driven gear 6, the generator gear shaft 5, and the generator rotor shaft 7 to charge the vehicle battery pack.

[0040] Generator single-gear pure electric drive: When the first clutch 400 is open and the second clutch 500 is closed, the power of the generator 100 drives the vehicle through the generator rotor shaft 7, the generator gear shaft 5, the generator driven gear 6, the hybrid drive driving gear 4, the hybrid drive driven gear 9, the second clutch 500, the hybrid drive output shaft 8, the main reduction driving gear 10, the main reduction driven gear 12, and the differential 11. The power used by the generator 100 comes from the vehicle battery pack. The generator single-gear drive condition can be combined with the rear-wheel pure electric drive system to achieve four-wheel pure electric drive of the vehicle.

[0041] Engine single-gear drive: When the first clutch 400 and the second clutch 500 are both closed, the power of the engine 200 drives the vehicle to travel through the shock absorber 1, the input flange 2, the first clutch 400, the input shaft 3, the hybrid drive driving gear 4, the hybrid drive driven gear 9, the second clutch 500, the hybrid drive output shaft 8, the main reduction driving gear 10, the main reduction driven gear 12, and the differential 11. Under this working condition, the generator 100 is in an idling state. The engine single-gear drive working condition can be combined with the rear-wheel pure electric drive system to realize the vehicle's four-wheel hybrid drive.

[0042] Engine single-gear drive, generator auxiliary drive: Under the aforementioned engine single-gear drive condition, the generator 100 is placed in a power generation state, and the engine 200 is placed in a high fuel efficiency range for stable operation. The vehicle acceleration and deceleration and braking energy recovery deceleration are controlled by switching the positive and negative torque of the rear wheel pure electric drive system or adjusting the drive torque.

[0043] Rear-wheel pure electric drive system with a single motor: When the vehicle battery pack has sufficient power, the rear-wheel pure electric drive system will perform the pure electric drive function when the vehicle starts slowly or on roads with low power requirements. The front-wheel drive single-motor single-speed hybrid system will not participate in the work, and the power required for the rear-wheel pure electric drive system comes from the vehicle battery pack.

[0044] Extended-range drive: When the vehicle is in motion, the first clutch 400 is closed and the second clutch 500 is open. The gearbox executes the function of the engine 200 driving the generator 100 to generate electricity, and cooperates with the rear-wheel pure electric drive system to achieve extended-range drive of the vehicle. During extended-range drive, part of the power required by the rear-wheel pure electric drive system comes from the vehicle battery pack, and part comes from the generator 100.

[0045] Engine start-stop: The start and stop of the engine 200 in the parking power generation or vehicle driving state is driven and controlled by the generator 100 when the first clutch 400 is closed and the second clutch 500 is open.

[0046] Reversing: The vehicle reverses when the drive motor of the rear-wheel pure electric drive system is driven in reverse under pure electric drive or extended-range drive conditions.

[0047] Braking energy recovery: Braking energy recovery during vehicle driving is implemented by converting the drive motor of the rear wheel pure electric drive system into a power generation state.

[0048] Embodiment 2 The difference from the first embodiment is that the second clutch 500 is a double clutch structure consisting of an inner clutch 501 and an outer clutch 502 , the input shaft 3 is further mounted with a hybrid drive second driving gear 41 , and the hybrid drive output shaft 8 is further mounted with a hybrid drive second driven gear 40 .

[0049] Among them, the inner clutch 501 connects the hybrid drive driven gear 9 and the hybrid drive output shaft 8, and the outer clutch 502 connects the hybrid drive second driven gear 40 and the hybrid drive output shaft 8. When the first clutch 400 is opened, after the power of the generator 100 passes through the generator rotor shaft 7, the generator gear shaft 5, the power generation driven gear 6, and the hybrid drive driving gear 4, there are two power transmission paths: the inner clutch 501 is closed, the outer clutch 502 is opened, and the power of the generator 100 is transmitted to the hybrid drive output shaft 8 through the hybrid drive driving gear 4, the hybrid drive driven gear 9, and the inner clutch 501; the inner clutch 501 is opened, the outer clutch 502 is closed, and the power of the generator 100 is transmitted to the hybrid drive output shaft 8 through the hybrid drive second driving gear 41, the hybrid drive second driven gear 40, and the outer clutch 502; after the power of the generator 100 is transmitted to the hybrid drive output shaft 8, the vehicle is driven to travel through the main reduction driving gear 10, the main reduction driven gear 12, and the differential 11, and the generator enters the two-speed driving mode.

[0050] When the engine 200 provides power and the first clutch 400 is closed, the power transmission path and gear change of the engine 200 after passing through the shock absorber 1, the input flange 2, the first clutch 400, and the input shaft 3 are consistent with the two-speed drive system of the generator 100, and the engine enters the two-speed drive mode. Specifically, the inner clutch 501 includes an inner clutch inner hub 32, an inner clutch friction plate 33, an inner clutch steel plate 34, an inner clutch piston 35, an inner clutch return spring 36, an inner clutch return spring baffle 37, a clutch intermediate hub 38 with inner and outer retaining rings, and a clutch intermediate hub support 39; the outer clutch 502 includes a clutch intermediate hub 38 with inner and outer retaining rings, a clutch intermediate hub support 39, an outer clutch outer hub 310, an outer clutch friction plate 311, an outer clutch steel plate 312, an outer clutch piston 313, an outer clutch piston support 314, an outer clutch return spring 315 and an outer clutch return spring baffle 316; the clutch intermediate hub 38 with inner and outer retaining rings and the clutch intermediate hub support 39 are common parts of the inner clutch 501 and the outer clutch 502. The inner hub 32 of the inner clutch is welded to the hybrid drive driven gear 9, and is slidingly splined to the inner clutch friction plate 33; the clutch intermediate hub 38 with inner and outer retaining rings is welded to the clutch intermediate hub support 39, and is slidingly splined to the inner clutch steel plate 34 and the outer clutch steel plate 312; the clutch intermediate hub support 39 is splined to the hybrid drive output shaft 8; the inner clutch piston 35 is installed in the space formed by the clutch intermediate hub support 39 and is slidingly connected to the clutch intermediate hub support 39 through the inner and outer diameters; the inner clutch piston hydraulic working chamber is formed between the clutch intermediate hub support 39 and the inner clutch piston 35. The outer clutch outer hub 310 is welded to the second driven gear 40 of the hybrid drive, and is slidingly splined to the outer clutch friction plate 311. The outer clutch piston 313 is arranged in the space of the outer clutch piston support 134, and is slidingly matched with the outer clutch piston support 314 through the inner and outer diameters. The outer clutch piston support 314 is splined to the hybrid drive output shaft 8, and an outer clutch piston hydraulic working chamber is formed between the outer clutch piston 313 and the outer clutch piston support 314.

[0051] The hydraulic system includes a high-pressure oil pump 21, a first clutch solenoid valve and a high-pressure oil circuit 22 for controlling the operation of the first clutch 400, an inner clutch solenoid valve and a high-pressure oil circuit 42 for controlling the operation of the inner clutch 501, and a second clutch outer clutch solenoid valve and a high-pressure oil circuit 43 for controlling the operation of the outer clutch 502. The cooling and lubricating oil circuit of the outer clutch 502 needs to be guided to the left end of the hybrid drive output shaft 8 and enter the outer clutch 502 of the second clutch 500 from the eccentric hole at the left end of the hybrid drive output shaft 8.

[0052] When the inner clutch solenoid valve and the high-pressure oil circuit 42 are at high pressure, the high-pressure oil enters the inner clutch hydraulic working chamber through the center hole at the left end of the hybrid drive output shaft 8, and the hydraulic pressure pushes the inner clutch piston 35 to move in the piston space of the clutch intermediate hub support 39 to achieve the closing of the inner clutch 501; when the inner clutch solenoid valve and the high-pressure oil circuit 42 are at low pressure, the inner clutch return spring 36 returns the inner clutch piston 35 to achieve the opening of the inner clutch 501; when the outer clutch solenoid valve and the high-pressure oil circuit 43 are at high pressure, the hydraulic oil enters the eccentric hole closed at one end through the outer diameter of the left end of the hybrid drive output shaft 8 and then enters the outer clutch hydraulic working chamber, and the hydraulic pressure pushes the outer clutch piston 313 to move to achieve the closing of the outer clutch 502; when the outer clutch solenoid valve and the high-pressure oil circuit 43 are at low pressure, the outer clutch return spring 315 returns the outer clutch piston 313 to achieve the opening of the outer clutch 502.

[0053] When the clutch is not working, the first clutch solenoid valve and the high-pressure oil circuit 22, the inner clutch solenoid valve and the high-pressure oil circuit 42, and the outer clutch solenoid valve and the high-pressure oil circuit 43 all require low pressure, the switch valve of the high- and low-pressure connecting oil circuit 48 is opened, and the lubricating oil in the high-pressure oil circuit enters the cooling lubricating oil circuit 46 as a supplement to the cooling lubricating oil circuit 46. When the generator 100 and the engine 200 need to work, at least one of the first clutch solenoid valve and the high-pressure oil circuit 22, the inner clutch solenoid valve and the high-pressure oil circuit 42, and the outer clutch solenoid valve and the high-pressure oil circuit 43 requires high-pressure oil, the switch valve of the high- and low-pressure connecting oil circuit 48 is closed, and the excess high-pressure oil generated by the continuous operation of the high-pressure oil pump enters the low-pressure oil circuit through the overflow valve of the high- and low-pressure connecting oil circuit 48.

[0054] The working mode of this embodiment is as follows: Parking power generation: When the vehicle is stopped, the first clutch 400 is closed and the inner and outer clutches of the second clutch 500 are opened. After the engine 200 is started using the power of the generator 100, the power of the engine 200 drives the generator 100 to generate electricity through the shock absorber 1, the input flange 2, the first clutch 400, the input shaft 3, the hybrid drive driving gear 4, the power generation driven gear 6, the generator gear shaft 5, and the generator rotor shaft 7 to charge the vehicle battery pack.

[0055] Generator two-speed drive: When the first clutch 400 is open and the second clutch 500 is closed, the power of the generator 100 passes through the generator rotor shaft 7, the generator gear shaft 5, the generator driven gear 6, and the hybrid drive driving gear 4. At a lower vehicle speed, the inner clutch 501 is opened and the outer clutch 502 is closed, and the power of the generator 100 is transmitted to the hybrid drive output shaft 8 through the hybrid drive second driving gear 41, the hybrid drive second driven gear 40, and the outer clutch 502; at a higher vehicle speed, the inner clutch 501 is closed and the outer clutch 502 is opened, and the power of the generator 100 is transmitted to the hybrid drive output shaft 8 through the hybrid drive driving gear 4, the hybrid drive driven gear 9, and the inner clutch 501; after the power of the generator 100 is transmitted to the hybrid drive output shaft 8, the vehicle is driven to travel through the main reduction driving gear 10, the main reduction driven gear 12, and the differential 11, thereby realizing the two-speed drive of the generator, and cooperating with the rear-wheel pure electric drive system to realize the two-speed four-wheel pure electric drive of the vehicle. The power used to drive the generator 100 comes from the vehicle battery pack. The two-speed drive of the generator is generally used for pure electric driving conditions with high power requirements and emergency vehicle starts.

[0056] Engine two-speed drive: When the first clutch 400 is closed, the power transmission path and gear control of the engine 200 after passing through the shock absorber 1, the input flange 2, the first clutch 400, and the input shaft 3 are consistent with the generator two-speed drive, forming an engine two-speed drive, and cooperating with the rear-wheel pure electric drive system to achieve the vehicle's two-speed four-wheel hybrid drive. The engine two-speed drive is generally used when the vehicle is at medium and high speeds, especially in high-speed driving conditions, to give full play to the engine's fuel efficiency.

[0057] Engine two-speed drive, generator auxiliary drive: Under the engine two-speed drive condition, the generator 100 is placed in a power generation state, and the engine 200 is placed in a high fuel efficiency range for stable operation. The vehicle acceleration and deceleration and brake energy recovery deceleration are controlled by switching the positive and negative torque of the rear wheel pure electric drive system or adjusting the drive torque.

[0058] Extended-range drive: When the vehicle is in driving state, the first clutch 400 is closed, the inner clutch 501 and the outer clutch 502 of the second clutch 500 are both opened, and the gearbox performs the function of the engine driving the generator to generate electricity, and cooperates with the rear-wheel pure electric drive system to realize the extended-range drive of the vehicle; during extended-range drive, part of the power required by the rear-wheel pure electric drive system comes from the vehicle battery pack, and part comes from the generator 100.

[0059] Engine start-stop: The start and stop of the engine 200 in the parking power generation or vehicle driving state is driven and controlled by the generator 100 when the first clutch 400 is closed and the second clutch 500 is open.

[0060] Reversing: When the vehicle is reversing, the drive motor of the rear-wheel pure electric drive system is reverse driven under pure electric drive or extended-range drive conditions. If necessary, the generator of the front-wheel drive single-motor two-speed hybrid transmission can participate in the reverse drive.

[0061] Braking energy recovery: Braking energy recovery during vehicle driving is implemented by converting the drive motor of the rear wheel pure electric drive system into a power generation state.

[0062] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A front-wheel drive single-motor hybrid transmission and hydraulic cooling and lubrication system, characterized in that: include: A power source, comprising a generator (100) and an engine (200), A gear transmission system for transmitting power from a power source, comprising a generator driven gear (6) arranged on a generator gear shaft (5), a hybrid drive driving gear (4) arranged on an input shaft 3 and meshing with the generator driven gear (6), and a hybrid drive driven gear (9) mounted on a hybrid drive output shaft (8) and meshing with the hybrid drive driving gear (4), wherein a main reduction driving gear (10) and a main reduction driven gear (12) mounted on a differential (11) and meshing with the main reduction driving gear (10) are also mounted on the hybrid drive output shaft (8). A clutch system comprising a first clutch (400) coaxial with the engine and connecting an input flange (2) and an input shaft (3), and a second clutch (500) mounted on a hybrid drive output shaft (8) and connecting a hybrid drive driven gear (9) and the hybrid drive output shaft (8), A cooling and lubrication system for cooling and lubricating the generator (100), the gear transmission system and the clutch system, The hydraulic system is used to control the opening and closing of two clutches in the clutch system, realize the separation and connection of the power of the engine (200), and determine whether the power of the two power sources participates in the vehicle driving.

2. The front-wheel drive single-motor hybrid power transmission and hydraulic cooling and lubrication system according to claim 1, characterized in that: The power generation driven gear (6) is arranged on the generator gear shaft (5), and the generator gear shaft (5) is spline-connected to the generator rotor shaft (7); the hybrid drive driving gear (4) is arranged on the input shaft (3), and the input shaft (3) is coaxially arranged with the input flange (2) and connected through a first clutch (400); the input flange (2) is spline-connected to the shock absorber (1) on the engine (200); and a second clutch (500) is arranged on the hybrid drive output shaft (8); When the first clutch (400) is closed and the second clutch (500) is opened, the power of the engine (200) drives the generator to generate electricity through the shock absorber (1), the input flange (2), the first clutch (400), the input shaft (3), the hybrid drive driving gear (4), the generator driven gear (6), the generator gear shaft (5), and the generator rotor shaft (7), thereby entering the engine-driven generator power generation mode.

3. The front-wheel drive single-motor hybrid power transmission and hydraulic cooling and lubrication system according to claim 2, characterized in that: The hybrid drive output shaft (8) is provided with a hybrid drive driven gear (9) and a second clutch (500), and the hybrid drive driven gear (9) is connected to the hybrid drive output shaft (8) via the second clutch (500); When the first clutch (400) is opened and the second clutch (500) is closed, the power of the generator (100) drives the vehicle to travel through the generator rotor shaft (7), the generator gear shaft (5), the generator driven gear (6), the hybrid drive driving gear (4), the hybrid drive driven gear (9), the second clutch (500), the hybrid drive output shaft (8), the main reduction driving gear (10), the main reduction driven gear (12), and the differential (11), thereby entering the generator single-gear drive mode.

4. The front-wheel drive single-motor hybrid power transmission and hydraulic cooling and lubrication system according to claim 2, characterized in that: When the first clutch (400) and the second clutch (500) are both closed, the power of the engine (200) drives the vehicle to travel through the shock absorber (1), the input flange (2), the first clutch (400), the input shaft (3), the hybrid drive driving gear (4), the hybrid drive driven gear (9), the second clutch (500), the hybrid drive output shaft (8), the main reduction driving gear (10), the main reduction driven gear (12), and the differential (11), thereby entering the engine single-speed drive system.

5. The front-wheel drive single-motor hybrid power transmission and hydraulic cooling and lubrication system according to claim 2, characterized in that: The first clutch (400) is arranged between the input shaft (3) and the input flange (2), and comprises a clutch inner hub (13), a clutch friction plate (14), a clutch steel plate (15), a clutch outer hub (16) with a retaining ring, a clutch piston (17), a clutch return spring (18) and a clutch return spring retaining plate (19); the clutch inner hub (13) is welded to the input flange (2) and is slidably splined to the clutch friction plate (14); the clutch outer hub (16) with a retaining ring is welded to the hybrid drive driving gear (4) and is slidably splined to the clutch steel plate (15); the clutch piston (17) is arranged in the space between the input shaft (3) and the hybrid drive driving gear (4), and is slidably connected to the input shaft (3) and the hybrid drive driving gear (4) through inner and outer diameters; a first clutch hydraulic working chamber is formed between the input shaft (3), the hybrid drive driving gear (4) and the clutch piston (17).

6. The front-wheel drive single-motor hybrid power transmission and hydraulic cooling and lubrication system according to claim 5, characterized in that: The second clutch (500) is located at the motor-side end of the hybrid drive output shaft (8), and comprises a clutch inner hub (13), a clutch friction plate (14), a clutch steel plate (15), a clutch outer hub (16) with a retaining ring, a clutch piston (17), a clutch return spring (18), a clutch return spring retaining plate (19) and a clutch outer hub support (20). The clutch inner hub (13) is welded to the hybrid drive driven gear (9) and is slidably connected to the clutch friction plate (14). The clutch outer hub (16) with a retaining ring is welded to the clutch outer hub support (20) and is slidably connected to the clutch steel plate (15). The clutch outer hub support (20) is spline-connected to the hybrid drive output shaft (8). The clutch piston (17) is installed in a space formed by the clutch outer hub support (20) and is slidably connected to the clutch outer hub support (20) through inner and outer diameters. A second clutch piston hydraulic working chamber is formed between the clutch outer hub support (20) and the clutch piston (17).

7. The front-wheel drive single-motor hybrid power transmission and hydraulic cooling and lubrication system according to claim 6, characterized in that: The hydraulic system comprises a high-pressure oil pump (21), a first clutch solenoid valve and a high-pressure oil circuit (22), and a second clutch solenoid valve and a high-pressure oil circuit (23); When the first clutch solenoid valve and the high-pressure oil circuit (22) are at high pressure, the high-pressure lubricating oil enters the first clutch hydraulic working chamber through the central oil hole at the left end of the input shaft (3) to drive the clutch piston (17) to move in the piston space formed by the input shaft (3) and the hybrid drive driving gear (4), thereby closing the first clutch (400); when the first clutch solenoid valve and the high-pressure oil circuit (22) are at low pressure, the clutch return spring (18) returns the clutch piston (17), thereby opening the first clutch (400); When the second clutch solenoid valve and the high-pressure oil circuit (23) are at high pressure, the high-pressure lubricating oil enters the hydraulic working chamber of the second clutch through the center hole at the left end of the hybrid drive output shaft (8) to drive the clutch piston (17) to move in the piston space of the clutch outer hub support (20), thereby closing the second clutch (500); when the second clutch solenoid valve and the high-pressure oil circuit (23) are at low pressure, the clutch return spring (18) returns the clutch piston (17), thereby opening the second clutch (500).

8. The front-wheel drive single-motor hybrid power transmission and hydraulic cooling and lubrication system according to claim 1, characterized in that: The cooling and lubricating system comprises a low-pressure oil pump (44), an oil cooler (45), a cooling and lubricating oil circuit (46), a generator stator cooling oil pipe (47) and a high- and low-pressure connecting oil circuit (48). The low-pressure oil pump (44) pumps out the lubricating oil at the bottom of the gearbox and enters the oil cooler (45) fixed on the outside of the gearbox housing through the housing oil passage. The vehicle's water cooling facility provides cooling water to perform heat exchange in the oil cooler (45) to cool the lubricating oil. The cooled lubricating oil is circulated into the gearbox housing and transported to all operating and heat-generating parts in the gearbox through the cooling and lubricating oil circuit (46) in the gearbox housing. The main oil circuit of the cooling and lubricating oil circuit (46) is arranged in the gearbox housing on the engine side, and the oil cooler (45) is fixed on the outside of the gearbox housing on the engine side. The generator stator cooling oil pipe (47) guides the lubricating oil of the cooling lubricating oil circuit (46) to the upper part of the stator of the generator (100), and sprays it to the part of the stator of the generator (100) that needs to be cooled; The high-low pressure connecting oil circuit (48) includes a switch valve and a relief valve. When the clutch is not working, the first clutch solenoid valve and the high-pressure oil circuit (22) and the second clutch solenoid valve and the high-pressure oil circuit (23) both require low pressure, the switch valve of the high-low pressure connecting oil circuit (48) is opened, and the lubricating oil in the high-pressure oil circuit enters the cooling lubricating oil circuit (46) as a supplement to the cooling lubricating oil circuit (46). When the generator (100) and the engine (200) need to work, at least one of the first clutch solenoid valve and the high-pressure oil circuit (22) and the second external clutch solenoid valve and the high-pressure oil circuit (23) requires high-pressure oil, the switch valve of the high-low pressure connecting oil circuit (48) is closed, and the excess high-pressure oil generated by the continuous operation of the high-pressure oil pump enters the low-pressure oil circuit through the relief valve of the high-low pressure connecting oil circuit (48).

9. The front-wheel drive single-motor hybrid power transmission and hydraulic cooling and lubrication system according to claim 6, characterized in that: The second clutch (500) is a dual clutch structure consisting of an inner clutch (501) and an outer clutch (502); the input shaft (3) is also equipped with a hybrid drive second driving gear (41); and the hybrid drive output shaft (8) is also equipped with a hybrid drive second driven gear (40); thus, a hybrid power transmission is formed in which both the generator and the engine can be driven in two gears; The inner clutch (501) comprises an inner clutch inner hub (32), an inner clutch friction plate (33), an inner clutch steel plate (34), an inner clutch piston (35), an inner clutch return spring (36), an inner clutch return spring baffle (37), a clutch intermediate hub (38) with inner and outer retaining rings, and a clutch intermediate hub support (39); the outer clutch (502) comprises a clutch intermediate hub (38) with inner and outer retaining rings, a clutch intermediate hub support (39), an outer clutch outer hub (310), an outer clutch friction plate (311), an outer clutch steel plate (312), an outer clutch piston (313), an outer clutch piston support (314), an outer clutch return spring (315), and an outer clutch return spring baffle (316); the clutch intermediate hub (38) with inner and outer retaining rings and the clutch intermediate hub support (39) are common parts of the inner clutch (501) and the outer clutch (502); The inner hub (32) of the inner clutch is welded to the hybrid drive driven gear (9) and is slidingly splined to the inner clutch friction plate (33); the clutch intermediate hub (38) with inner and outer retaining rings is welded to the clutch intermediate hub support (39) and is slidingly splined to the inner clutch steel plate (34) and the outer clutch steel plate (312); the clutch intermediate hub support (39) is splined to the hybrid drive output shaft (8); the inner clutch piston (35) is installed in the space formed by the clutch intermediate hub support (39) and is slidingly connected to the clutch intermediate hub support (39) through the inner and outer diameters; the clutch intermediate hub support (39) and the inner clutch piston (35) form an inner clutch piston hydraulic working chamber; The outer clutch outer hub (310) is welded to the hybrid drive second driven gear (40) and is slidingly splined to the outer clutch friction plate (311); the outer clutch piston (313) is arranged in the space of the outer clutch piston support (134) and is slidingly matched with the outer clutch piston support (314) through the inner and outer diameters; the outer clutch piston support (314) is splined to the hybrid drive output shaft (8); and an outer clutch piston hydraulic working chamber is formed between the outer clutch piston (313) and the outer clutch piston support (314).

10. The front-wheel drive single-motor hybrid power transmission and hydraulic cooling and lubrication system according to claim 9, characterized in that: The hydraulic system of a two-speed drive hybrid transmission comprises a high-pressure oil pump (21), a first clutch solenoid valve and a high-pressure oil circuit (22), and also comprises an inner clutch solenoid valve and a high-pressure oil circuit (42) and an outer clutch solenoid valve and a high-pressure oil circuit (43). When the inner clutch solenoid valve and the high-pressure oil circuit (42) are at high pressure, the high-pressure oil enters the hydraulic working chamber of the inner clutch through the center hole at the left end of the hybrid drive output shaft (8), and the hydraulic pressure pushes the inner clutch piston (35) to move in the piston space of the clutch intermediate hub support (39), thereby closing the inner clutch (501); when the inner clutch solenoid valve and the high-pressure oil circuit (42) are at low pressure, the inner clutch return spring (36) returns the inner clutch piston (35), thereby opening the inner clutch (501); When the external clutch solenoid valve and the high-pressure oil circuit (43) are at high pressure, the hydraulic oil enters the eccentric hole closed at one end through the outer diameter of the hybrid drive output shaft (8) and then enters the hydraulic working chamber of the external clutch, and the hydraulic pressure pushes the external clutch piston (313) to move to achieve the closing of the external clutch (502); when the external clutch solenoid valve and the high-pressure oil circuit (43) are at low pressure, the external clutch return spring (315) returns the external clutch piston (313) to achieve the opening of the external clutch (502).

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