Range-extending-driven hybrid power gearbox and cooling and lubricating system

Abstract

The utility model relates to the technical field of hybrid power gearboxes, in particular to an extended-range driving hybrid power gearbox and a cooling and lubricating system, which comprise three power sources, namely an engine, a driving motor and a generator, and a gear transmission system for transmitting the power of the three power sources, the cooling and lubricating system is used for ensuring normal work of two motors and a gear transmission system; the gearbox is composed of a power generation system and a pure electric drive system which are mutually independent, and an engine, a generator and a gear transmission system connected with the two power sources form a power generation system. Power of the driving motor drives the vehicle to run through the gear transmission system and the differential mechanism to form a pure electric driving system. The cooling and lubricating system comprises an electric control oil pump, an oil cooler and a cooling and lubricating oil way, and lubricating oil needed by cooling and lubricating is provided for the motor stator, the rotor and the gear transmission system. The device is simple and reliable in structure, low in manufacturing cost and low in control difficulty, and various deformation schemes can be achieved through the modular design to meet the requirements of various vehicle types.

Description

Technical Field

[0001] The utility model relates to the technical field of hybrid gearboxes, in particular to a range-extended hybrid gearbox and a cooling and lubrication system thereof. Background Technique

[0002] With the rapid growth of the global automobile ownership, the pressures in aspects such as energy, environment, and safety are increasing day by day, which has accelerated the process of global automobile energy conservation and electrification. Facing the industrial bottlenecks of pure electric vehicles, such as range anxiety, imperfect construction of charging infrastructure, and the difficulty of achieving major technological breakthroughs in power batteries in the short and medium terms, pure electric vehicles are currently difficult to meet the current market demand for automobile use.

[0003] Ordinary hybrid electric vehicles (HEVs) and plug-in hybrid electric vehicles (PHEVs) can not only meet the current target requirements in the direction of emissions and energy conservation at home and abroad, but also meet the current market use conditions to a high degree, and have been widely promoted and applied globally. In the medium and long term, passenger cars using hybrid forms will still be important models in the domestic and foreign automobile consumption fields and have great market prospects.

[0004] As the core component of the powertrain system of hybrid electric vehicles (HEVs, PHEVs), the hybrid gearbox can improve the fuel economy of the whole vehicle and optimize the power performance of the whole vehicle under multiple working conditions by controlling the power coupling of the engine and the motor in real time. The existing mass-produced hybrid transmission products of the company are difficult to meet the development needs of the future driving market due to their relatively complex structure and high manufacturing cost.

[0005] Therefore, it has become an urgent problem to develop a hybrid gearbox with a simple structure, low control difficulty, low manufacturing cost, modular design that can be extended with multiple functions, small external dimensions, high transmission efficiency, good cooling effect, and can cover more vehicle models. Summary of the Invention

[0006] The technical problem to be solved by the utility model is: to provide a range-extended hybrid gearbox and a cooling and lubrication system to solve the problems existing in the prior art in the above background technique.

[0007] The technical solution adopted by the utility model to solve its technical problems is: a range-extended hybrid gearbox and a cooling and lubrication system, including three power sources: an engine, a drive motor, and a generator, including a gear transmission system for transmitting the power of the three power sources, and including a cooling and lubrication system for ensuring the normal operation of the two motors and the gear transmission system; the gear transmission system is composed of two independent systems: power generation and pure electric drive, and the cooling and lubrication system includes an electronic control oil pump, an oil cooler, and a cooling lubricating oil circuit.

[0008] Further, the power generation system in the gear transmission system includes two power sources, namely a generator and an engine, and a first gear transmission system connecting the two power sources. The first gear transmission system includes a power generation driving gear and a power generation driven gear. The power generation driving gear is arranged on the input shaft, and the input shaft is splined to the shock absorber on the engine; the power generation driven gear is arranged on the generator rotor shaft, and the power generation driven gear meshes with the power generation driving gear on the input shaft.

[0009] Further, the pure electric drive system in the gear transmission system includes a drive motor and a differential, and a second gear transmission system connecting the drive motor and the differential. The second gear transmission system includes a drive motor rotor shaft, a drive motor gear shaft, an electric drive output shaft, an electric drive driving gear, an electric drive driven gear, an electric drive main reduction driving gear, and a main reduction driven gear. The electric drive driving gear is arranged on the drive motor gear shaft; the drive motor gear shaft is splined to the drive motor rotor shaft; the electric drive driven gear is arranged on the electric drive output shaft and meshes with the electric drive driving gear on the drive motor gear shaft; an electric drive main reduction driving gear is further arranged on the electric drive output shaft; a main reduction driven gear is arranged on the differential; and the main reduction driven gear meshes with the electric drive main reduction driving gear on the electric drive output shaft.

[0010] Further, the cooling and lubrication system includes an electronically controlled oil pump and an oil cooler cooling lubricating oil circuit; the electronically controlled oil pump is arranged at the bottom of the gearbox housing, and the cooling lubricating oil circuit is arranged on the gearbox housing on the engine side.

[0011] Further, the cooling lubricating oil circuit further includes cooling and lubricating branch oil circuits composed of a plurality of hollow shafts, including branch oil circuit one and branch oil circuit two. Branch oil circuit one communicates with the hollow generator rotor shaft, and branch oil circuit two communicates with the hollow drive motor gear shaft and the hollow drive motor rotor shaft splined thereto.

[0012] Further, the cooling and lubrication system further includes a generator stator cooling oil pipe, a drive motor stator cooling oil pipe and an oil sump. The generator stator cooling oil pipe is arranged on the upper part of the generator stator, the drive motor stator cooling oil pipe is arranged on the upper part of the drive motor stator, and both the generator stator cooling oil pipe and the drive motor stator cooling oil pipe are connected to the cooling lubricating oil circuit.

[0013] Further, the cooling 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 on the engine side.

[0014] The beneficial effects of the present utility model:

[0015] This utility model generates electricity by an engine driving a generator and provides power to the vehicle through a driving motor for pure electric driving. The two motors operate independently, with low control difficulty, simple structure, and low manufacturing cost. The cooling and lubrication system ensures the cooling of the motors and the lubrication of the transmission gear set and the gear transmission system through the setting of an electronically controlled oil pump and an oil cooler, ensuring normal motor temperature during low-speed vehicle driving and not affecting vehicle performance.

[0016] On the one hand, each functional system of this utility model is modularly designed. Through the design changes of the two-speed driving system of the engine, multiple hybrid gearboxes with different functions can be developed on the same platform. On the other hand, the three power sources work together to improve the vehicle's power performance and fuel economy.

[0017] This utility model can realize functions such as engine start-stop, parking power generation, pure electric driving, range-extending driving, reversing, and braking energy recovery, ultimately improving the vehicle's fuel economy and meeting emission requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The following further illustrates this utility model in conjunction with the drawings and embodiments.

[0019] Figure 1 is a schematic cross-sectional structure diagram of this utility model.

[0020] Figure 2 is a schematic diagram of the principle of this utility model.

[0021] In the figures: 100, generator; 200, engine; 300, driving motor; 1, shock absorber; 2, input shaft; 4, driving gear for power generation; 5, generator rotor shaft; 6, driven gear for power generation; 7, driving motor rotor shaft; 8, driving motor gear shaft; 9, main driving gear for electric drive; 10, output shaft for electric drive; 11, driven gear for electric drive; 12, main driving gear for electric drive and main reduction gear; 13, differential; 14, driven gear of the main reduction gear; 30, electronically controlled oil pump; 31, oil cooler; 32, cooling and lubricating oil circuit; 321, branch oil circuit one; 322, branch oil circuit two; 33, generator stator cooling oil pipe; 34, driving motor stator cooling oil pipe; 35, oil sump. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] Now, this utility model will be further described in detail in conjunction with the drawings. These drawings are all simplified schematic diagrams, only illustrating the basic structure of this utility model in a schematic manner, so they only show the components related to this utility model.

[0023] As Figure 1 and Figure 2As shown, a range-extended hybrid transmission and cooling and lubrication system includes three power sources: an engine 200, a drive motor 300, and a generator 100, a gear transmission system for transmitting the power of the three power sources, and a cooling and lubrication system for ensuring the normal operation of the two motors and the gear transmission system; the gear transmission system consists of two independent systems: a power generation system and a pure electric drive system, and the cooling and lubrication system includes an electronically controlled cooling oil pump 30, an oil cooler 31, and a cooling lubricating oil circuit 32, which provide cooling and lubrication for the stator, rotor of the generator 100, drive motor 300, and the gear transmission system. The generator 100 includes a generator rotor shaft 5, and the generator rotor shaft 5 is connected to the input shaft 2 through a transmission gear set. The drive motor 300 transmits power to the differential 13 through the gear transmission system; the cooling and lubrication system includes an electronically controlled oil pump 30, an oil cooler 31, and a cooling lubricating oil circuit 32. The electronically controlled oil pump 30 is connected to the oil cooler 31 and also to the cooling lubricating oil circuit 32. The cooling lubricating oil circuit 32 includes a plurality of branch oil circuits corresponding to the positions of the generator 100, drive motor 300, transmission gear set, and gear transmission system respectively.

[0024] In this embodiment, the power generation system in the gear transmission system includes two power sources: the generator 100 and the engine 200, and a first gear transmission system connecting the two power sources. The first gear transmission system includes a power generation driving gear 4 and a power generation driven gear 6. The power generation driving gear 4 is arranged on the input shaft 2, and the input shaft 2 is splined to the shock absorber 1 on the engine 200; the power generation driven gear 6 is arranged on the generator rotor shaft 5, and the power generation driven gear 6 meshes with the power generation driving gear 4 on the input shaft 2.

[0025] The pure electric drive system in the gear transmission system includes the drive motor 300 and the differential 13, and a second gear transmission system connecting the drive motor 300 and the differential 13. The second gear transmission system includes a drive motor rotor shaft 7, a drive motor gear shaft 8, an electric drive output shaft 10, an electric drive driving gear 9, an electric drive driven gear 11, an electric drive main reduction driving gear 12, and a main reduction driven gear 14. The electric drive driving gear 9 is arranged on the drive motor gear shaft 8; the drive motor gear shaft 8 is splined to the drive motor rotor shaft 5; the electric drive driven gear 11 is arranged on the electric drive output shaft 10 and meshes with the electric drive driving gear 9 on the drive motor gear shaft 8; an electric drive main reduction driving gear 12 is also arranged on the electric drive output shaft; the main reduction driven gear 14 is arranged on the differential 13; the main reduction driven gear 14 meshes with the electric drive main reduction driving gear 12 on the electric drive output shaft 10.

[0026] In this embodiment, the cooling and lubrication system includes an electronically controlled oil pump 30, an oil cooler 31, and a cooling and lubricating oil path 32. The electronically controlled oil pump 30 is arranged at the bottom of the transmission housing, pumps out the lubricating oil at the bottom of the transmission, and transports it through the oil path on the transmission housing into the oil cooler 31 fixed outside the transmission housing. The lubricating oil is cooled in the oil cooler 31 by the vehicle's water cooling system, and the cooled lubricating oil is sent into the cooling and lubricating oil path 32 inside the transmission. The cooling and lubricating oil path 32 is arranged on the transmission housing on the engine side.

[0027] In this embodiment, the cooling and lubricating oil path 32 further includes cooling and lubricating branch oil paths formed by several hollow shafts, including branch oil path one 321 and branch oil path two 322. Branch oil path one 321 is connected to the hollow generator rotor shaft 5 and is used for cooling the generator rotor and lubricating the generator gear parts. Branch oil path two 322 is connected to the hollow drive motor gear shaft 8 and the hollow drive motor rotor shaft 7 splined thereto, and is used for cooling the drive motor rotor and lubricating the electric drive gear parts.

[0028] The cooling and lubrication system further includes a generator stator cooling oil pipe 33, a drive motor stator cooling oil pipe 34, and an oil sump 35. The generator stator cooling oil pipe 33 is arranged on the upper part of the stator of the generator 100 and is used for cooling the stator of the generator 100. The drive motor stator cooling oil pipe 34 is arranged on the upper part of the stator of the drive motor 300 and is used for cooling the stator of the drive motor 300. Both the generator stator cooling oil pipe 33 and the drive motor stator cooling oil pipe 34 are connected to the cooling and lubricating oil path 32. The oil sump 35 collects the lubricating oil splashed by the gears in the transmission and converges it to the upper part of the motor stator of the generator 100 for supplementary cooling of the stator of the generator 100. The oil sump 35 is not connected to the cooling and lubricating oil path 32.

[0029] The cooling and lubricating oil path 32 is arranged inside the transmission housing on the engine 200 side, and the oil cooler 31 is fixed outside the transmission housing on the engine 200 side. The electronically controlled oil pump 30 pumps out the lubricating oil at the bottom of the transmission, enters the oil cooler 31 fixed outside the transmission housing through the housing oil passage, the lubricating oil is cooled by the vehicle's water cooling facilities, and the cooled lubricating oil is introduced into the transmission and transported to all the rotating and heating parts in the transmission through the cooling and lubricating oil path 32 in the transmission.

[0030] The cooling and lubrication system further includes a generator stator cooling oil pipe 33, a drive motor stator cooling oil pipe 34 and an oil sump 35. Both the generator stator cooling oil pipe 33 and the drive motor stator cooling oil pipe 34 are connected to the cooling lubricating oil path 32. The generator stator cooling oil pipe 33 guides the lubricating oil in the cooling lubricating oil path 32 to the upper part of the stator of the generator 100 and sprays it onto the parts of the stator of the generator 100 that need to be cooled; the drive motor stator cooling oil pipe 34 guides the lubricating oil in the cooling lubricating oil path 32 to the upper part of the stator of the drive motor 300 and sprays it onto the parts of the stator of the drive motor 300 that need to be cooled; the oil sump 35 collects the lubricating oil splashed by the gears in the gear chamber of the gearbox and converges it to the middle position of the upper part of the stator of the generator 100 for supplementary cooling of the stator of the generator 100. The setting of the oil sump 35 can strengthen the cooling of the stator of the generator 100 without energy consumption. At the same time, it can reduce the demand for the cooling oil volume of the generator stator cooling oil pipe 33, provide more lubricating oil for the cooling of the drive motor 300, and appropriately reduce the cooling flow demand of the assembly for the low-pressure oil pump.

[0031] In addition, the power generation system of the extended-range drive hybrid gearbox takes into account the engine drive scheme and can be developed on the same platform as a hybrid gearbox with a single-gear or multi-gear engine drive; at the same time, in the design of the extended-range drive hybrid gearbox without considering the engine drive, the input shaft 2 is shortened, and the power generation driving gear 4, the power generation driven gear 6, the generator rotor shaft 5, and the generator 100 as a whole move towards the engine direction, which can shorten the overall design length of the power generation system. Moreover, the pure electric drive system of the drive motor is relatively independent of the engine and the power generation system. By adjusting the positions of the overall movement, the main and driven gears of the electric drive, the main and driven gears of the main reducer of the electric drive, the differential design, and the central positions of the drive motor 300, the electric drive output shaft 10, and the differential 13, it can meet the requirements of various vehicle models and the layout requirements of the engine compartments with various special structures.

[0032] The specific working modes are as follows:

[0033] Parked power generation: When the vehicle is in a stopped state, the power of the engine 200 drives the generator 100 to generate electricity through the shock absorber 1, the input shaft 2, the power generation driving gear 4, the power generation driven gear 6, and the generator rotor shaft 5 to charge the vehicle battery pack.

[0034] Pure electric drive: The start-up of the vehicle and the pure electric driving of the vehicle are completed by the single-motor drive of the drive motor 300. The power of the drive motor 300 drives the vehicle to travel through the drive motor gear shaft 8 splined to the drive motor rotor shaft 7, the electric drive driving gear 9, the electric drive driven gear 11, the electric drive output shaft 10, the electric drive main reducer driving gear 12, the main reducer driven gear 14, and the differential 13. The electricity used by the drive motor 300 comes from the vehicle battery pack

[0035] Range-extended drive: When the vehicle is in motion, the power of the engine 200 drives the generator 100 to generate electricity through the shock absorber 1, input shaft 2, driving power generation gear 4, driven power generation gear 6, and generator rotor shaft 5, charging the vehicle battery pack or directly providing driving power to the drive motor 300. At the same time, the drive motor 300 performs the aforementioned pure electric drive function. Different from the aforementioned pure electric drive, when in range-extended drive, part of the power required by the drive motor 300 comes from the vehicle battery pack and part comes from the generator 100.

[0036] Engine start-stop: The start and stop of the engine 200 during parking power generation or when the vehicle is in motion are driven and controlled by the generator 100.

[0037] Reverse: The vehicle reverses under the condition of pure electric drive or range-extended drive, driven by the reverse rotation of the drive motor 300.

[0038] Regenerative braking energy recovery: The regenerative braking energy recovery during vehicle operation is implemented by converting the drive motor 300 into a power generation state.

[0039] Although the range-extended drive hybrid transmission and cooling and lubrication system of this embodiment have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present invention, including but not limited to: changing the electronically controlled oil pump to a mechanical oil pump, changing the driven power generation gear 6 integrated on the generator rotor shaft 7 to a non-integrated split scheme, or changing to a hybrid transmission with two-speed or single-speed engine drive through the setting of a clutch and the addition of an engine drive gear system.

[0040] Inspired by the above ideal embodiment of the present invention, through the above description, relevant staff can completely make various changes and modifications without departing 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 range-extended hybrid transmission and cooling and lubrication system, characterized in that: It includes three power sources, namely an engine (200), a drive motor (300), and a generator (100), a gear transmission system for transmitting the power of the three power sources, and a cooling and lubrication system for ensuring the normal operation of the two motors and the gear transmission system; the gear transmission system consists of two independent systems, namely a power generation system and a pure electric drive system, and the cooling and lubrication system includes an electronically controlled oil pump (30), an oil cooler (31), and a cooling and lubricating oil circuit (32).

2. The range-extended drive hybrid transmission and cooling and lubrication system according to claim 1, characterized in that: The power generation system in the gear transmission system includes two power sources, namely a generator (100) and an engine (200), and a first gear transmission system connecting the two power sources. The first gear transmission system includes a power generation driving gear (4) and a power generation driven gear (6). The power generation driving gear (4) is arranged on an input shaft (2), and the input shaft (2) is spline-connected to a shock absorber (1) on the engine (200); the power generation driven gear (6) is arranged on a generator rotor shaft (5), and the power generation driven gear (6) meshes with the power generation driving gear (4) on the input shaft (2).

3. The range-extended drive hybrid transmission and cooling and lubrication system according to claim 1, characterized in that: The pure electric drive system in the gear transmission system includes a drive motor (300) and a differential (13), and a second gear transmission system connecting the drive motor (300) and the differential (13). The second gear transmission system includes a drive motor rotor shaft (7), a drive motor gear shaft (8), an electric drive output shaft (10), an electric drive driving gear (9), an electric drive driven gear (11), an electric drive main reduction driving gear (12), and a main reduction driven gear (14). The electric drive driving gear (9) is arranged on the drive motor gear shaft (8); the drive motor gear shaft (8) is spline-connected to the drive motor rotor shaft (7); the electric drive driven gear (11) is arranged on the electric drive output shaft (10) and meshes with the electric drive driving gear (9) on the drive motor gear shaft (8); an electric drive main reduction driving gear (12) is further arranged on the electric drive output shaft; a main reduction driven gear (14) is arranged on the differential (13); and the main reduction driven gear (14) meshes with the electric drive main reduction driving gear (12) on the electric drive output shaft (10).

4. The range-extended drive hybrid transmission and cooling and lubrication system according to claim 1, characterized in that: The cooling and lubrication system includes an electronically controlled oil pump (30), an oil cooler (31), and a cooling and lubricating oil circuit (32); the electronically controlled oil pump (30) is arranged at the bottom of the gearbox housing, and the cooling and lubricating oil circuit (32) is arranged on the gearbox housing on the engine side.

5. The range-extended drive hybrid transmission and cooling and lubrication system according to claim 1, characterized in that: The cooling and lubricating oil circuit (32) further includes cooling and lubricating branch oil circuits composed of a plurality of hollow shafts, including a first branch oil circuit (321) and a second branch oil circuit (322). The first branch oil circuit (321) communicates with the hollow generator rotor shaft (5), and the second branch oil circuit (322) communicates with the hollow drive motor gear shaft (8) and the hollow drive motor rotor shaft (7) spline-connected thereto.

6. The range-extended drive hybrid transmission and cooling and lubrication system according to claim 1, characterized in that: The cooling and lubrication system further includes a generator stator cooling oil pipe (33), a drive motor stator cooling oil pipe (34), and an oil sump (35). The generator stator cooling oil pipe (33) is arranged on the upper part of the stator of the generator (100); the drive motor stator cooling oil pipe (34) is arranged on the upper part of the stator of the drive motor (300); both the generator stator cooling oil pipe (33) and the drive motor stator cooling oil pipe (34) are connected to the cooling lubricating oil path (32).

7. The range - extended drive hybrid transmission and cooling and lubrication system according to claim 1, wherein: The cooling lubricating oil path (32) is arranged in the gearbox housing on the engine (200) side, and the oil cooler (31) is fixed on the outer side of the gearbox housing on the engine (200) side.

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