Multi-mode dual-motor range-extending type hybrid power driving system

Abstract

A multi-mode dual-motor range-extending type hybrid power driving system comprises a first motor, a second motor, an engine, an input shaft, an intermediate shaft and a differential mechanism, the first motor and the second motor are arranged on the two sides of the differential mechanism in the radial direction, the engine is arranged opposite to the first motor and the second motor, the engine is fixedly connected with the input shaft, and the intermediate shaft is connected with the differential mechanism. The input shaft is provided with a first input gear, the first motor is fixedly connected with a first motor shaft, the first motor shaft is provided with a first driven gear, the first driven gear is meshed with the first input gear, a differential mechanism main reduction gear is fixed to the differential mechanism in the circumferential direction, and the second motor is fixedly connected with a second motor shaft. A second driving gear is arranged on the second motor shaft, an output driving gear and a second driven gear are arranged on the intermediate shaft, the output driving gear is meshed with the differential main reduction gear, and the second driven gear is meshed with the second driving gear.

Description

Technical Field

[0001] The present invention relates to the field of automobile transmission technology, and in particular to a multi-mode dual-motor range-extended hybrid power drive system. Background Art

[0002] Traditional fuel vehicles usually use oil as an energy source. With the scarcity of resources and the environmental pollution caused by automobile exhaust emissions, the country's restrictions on automobile exhaust emissions have become increasingly strict. Therefore, many automakers are gradually inclined to develop new energy vehicles with low emissions and low fuel consumption. However, pure electric vehicles among new energy vehicles have problems that are difficult to solve in the short term, such as high vehicle cost, long charging time, and unstable battery life. Hybrid vehicles, as a new energy vehicle, have the advantages of both traditional fuel vehicles and pure electric vehicles. Hybrid vehicles are driven by a drive motor and have working conditions such as motor direct drive, series drive, brake energy recovery, and engine idling power generation. They have a variety of efficient drive modes, which keep the engine running in a high efficiency range, thus having good fuel economy and low emissions. In the dual-motor hybrid systems currently available on the market, the motor shaft and the gear fixed on it are usually connected by splines, and the motor shafts of the generator and the drive motor are usually supported by three-point bearings. The axial arrangement space is large, and the three-point bearing support after the spline connection is easy to cause NVH problems in the drive system, and promotion has limitations. The existing dual-motor hybrid system generator and drive motor are usually supported and fixed at both ends by ball bearings, and the ball bearing + ball bearing support method has low transmission efficiency. Therefore, for reasons such as structural reliability, transmission efficiency of the transmission system, and component costs, the structure of the hybrid transmission still needs to be simplified. Summary of the invention

[0003] The purpose of the present invention is to provide a multi-mode dual-motor extended-range hybrid drive system to address the corresponding deficiencies of the prior art. The drive system has low fuel consumption, high transmission system efficiency, low pollutant emissions, and high vehicle power economy performance.

[0004] The objective of the present invention is achieved by adopting the following scheme: a multi-modal dual-motor extended-range hybrid drive system, comprising a first motor, a second motor, an engine, an input shaft, an intermediate shaft and a differential, wherein the first motor and the second motor are radially arranged on both sides of the differential, the engine is arranged opposite to the first motor and the second motor, the engine is connected and fixed to the input shaft, a first input gear is arranged on the input shaft, the first motor is connected and fixed to the first motor shaft, a first driven gear is arranged on the first motor shaft, the first driven gear is meshed with the first input gear, a differential main reduction gear is circumferentially fixed on the differential, the second motor is connected and fixed to the second motor shaft, a second driving gear is arranged on the second motor shaft, an output driving gear and a second driven gear are arranged on the intermediate shaft, the output driving gear is meshed with the differential main reduction gear, and the second driven gear is meshed with the second driving gear.

[0005] The first motor shaft, the second motor shaft, the input shaft and the intermediate shaft are parallel to each other.

[0006] Both ends of the input shaft are supported by a first ball bearing and a second ball bearing.

[0007] Both ends of the first motor shaft are supported by a first column bearing and a third ball bearing.

[0008] The differential main reduction gear is circumferentially fixed on the differential, and both ends of the differential are supported by a first cone bearing and a second cone bearing.

[0009] Both ends of the second motor shaft are supported by a fourth ball bearing and a second column bearing.

[0010] Both ends of the intermediate shaft are supported by a third tapered bearing and a fourth tapered bearing.

[0011] The first motor shaft and the first driven gear are integrally formed.

[0012] The second motor shaft and the second input gear are integrally formed.

[0013] The advantage of the present invention is that, by adopting the above technical solution, the engine can be started and speed-regulated by the first motor, so that the engine always works in the high-efficiency zone, thereby improving the working efficiency and economy of the engine. In addition, the first motor shaft is supported and fixed by column bearings and ball bearings at both ends, and the second motor shaft is supported and fixed by column bearings and ball bearings at both ends, and both adopt a two-point support method, which effectively improves the mechanical transmission efficiency of the drive system, reduces the number of parts and costs, and has a simple structure and a small axial space size, and can adapt to all three-cylinder engines and four-cylinder engine compartment layouts on the market, and can adapt to more models.

[0014] This drive system has the advantages of simple structure, small space size, good adaptability of engine compartment layout, and adaptability to a wide range of vehicle models. In addition, this drive system has low fuel consumption, high transmission efficiency, low pollutant emissions, and high vehicle power economy performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the pure electric driving mode; Figure 3 It is a schematic diagram of the series driving mode; Figure 4 It is a schematic diagram of energy recovery mode; Figure 5 This is a schematic diagram of the idle power generation mode; Figure 6 This is a schematic diagram of the engine starting mode. DETAILED DESCRIPTION

[0016] like Figure 1 As shown, a multi-mode dual-motor extended-range hybrid drive system includes a first motor 4, a second motor 22, an engine ICE, an input shaft 6, an intermediate shaft 14 and a differential 11, wherein the first motor shaft 2, the second motor shaft 21, the input shaft 6 and the intermediate shaft 14 are parallel to each other. The first motor 4 and the second motor 22 are radially arranged on both sides of the differential 11, the engine ICE is arranged opposite to the first motor 4 and the second motor 22, the engine ICE is connected and fixed to the input shaft 6, the two ends of the input shaft 6 are supported by the first ball bearing 9 and the second ball bearing 7, the input shaft 6 is provided with a first input gear 8, the first motor 4 is connected and fixed to the first motor shaft 2, the two ends of the first motor shaft 2 are supported by the first column bearing 1 and the third ball bearing 5, the first motor shaft 2 is provided with a first driven gear 3, and the first motor shaft 2 and the first driven gear 3 are integrally formed. The first driven gear 3 is meshed with the first input gear 8, the differential main reduction gear 12 is circumferentially fixed on the differential 11, and the two ends of the differential 11 are supported by the first cone bearing 13 and the second cone bearing 10, the second motor 22 is connected and fixed to the second motor shaft 21, and the two ends of the second motor shaft 21 are supported by the fourth ball bearing 23 and the second column bearing 19, the second motor shaft 21 is provided with a second driving gear 20, and the second motor shaft 21 is integrally formed with the second input gear 20. The intermediate shaft 14 is provided with an output driving gear 17 and a second driven gear 16, and the two ends of the intermediate shaft 14 are supported by the third cone bearing 18 and the fourth cone bearing 15, the output driving gear 17 is meshed with the differential main reduction gear 12, and the second driven gear 16 is meshed with the second driving gear 20.

[0017] In the drive system, the first motor and the second motor share the same battery group, or they can use different battery groups respectively. The engine can be a three-cylinder or four-cylinder engine, or other engines with similar functions. The first input gear meshes with the first driven gear to form an engine power generation gear pair; the engine is connected and fixed to the input shaft, that is, as long as the engine is in operation, the engine can drive the first motor to rotate to charge the battery. The second input gear meshes with the second driven gear to form a pure electric drive gear pair, and the output driving gear meshes with the differential main reduction gear to form a power output gear pair. The second motor transmits power to the wheels through the pure electric drive gear pair, the power output gear pair and the differential. At the same time, when the wheel is braked, the braking recovery energy is transmitted to the second motor through the differential, the power output gear pair and the pure electric drive gear pair, realizing the braking energy recovery of the drive system.

[0018] When the drive system is working, under the control of the control module, it has the following drive modes: Pure electric driving mode: like Figure 2 As shown in the figure, when the power system is in pure electric drive mode, the engine and the first motor stop running. At this time, the second motor and the second driven gear transmit power to the intermediate shaft, and then the intermediate shaft transmits power to the differential through the output driving gear and the differential main reduction gear, and finally the differential outputs power.

[0019] Series drive mode: like Figure 3 As shown, when the drive system is in series drive mode, the engine and the second motor run simultaneously. At this time, the engine transmits power to the first motor through the input shaft, the first input gear and the first driven gear, so that the first motor rotates to charge the battery; at the same time, the battery supplies energy to the second motor to make it rotate, and the second motor and the second driven gear transmit power to the intermediate shaft, and then the intermediate shaft transmits power to the differential through the output driving gear and the differential main reduction gear, and finally the differential outputs power.

[0020] Energy recovery mode: like Figure 4 As shown, when the drive system is in energy recovery mode, the control module can be used to control the hybrid drive system to achieve energy recovery mode. When the vehicle is braked, the braking energy of the vehicle is transferred to the second motor through the differential, the power output gear pair and the pure electric drive gear pair, so that the second motor charges the battery.

[0021] Idle power generation mode: like Figure 5As shown, when the drive system is in the idle power generation mode, the control module can be used to control the hybrid drive system to achieve the engine idle power generation mode. When the vehicle is idling, the second motor stops running, the engine is in an idle state, and the engine transmits power to the first motor through the input shaft and the engine power generation gear pair, so that the first motor rotates to charge the battery.

[0022] Start engine mode: like Figure 6 As shown, when the drive system is in the engine start mode, the control module can control the hybrid drive system to start the engine. The first motor transmits power to the engine through the engine generator gear pair and the input shaft, thereby achieving the purpose of starting the engine.

[0023] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification made to the present invention by those skilled in the art without departing from the spirit of the present invention shall fall within the protection scope of the present invention.

Claims

1. A multi-mode dual-motor range-extended hybrid drive system, comprising a first motor (4), a second motor (22), an engine (ICE), an input shaft (6), an intermediate shaft (14) and a differential (11), characterized in that: The first motor (4) and the second motor (22) are radially arranged on both sides of the differential (11); the engine (ICE) is arranged opposite to the first motor (4) and the second motor (22); the engine (ICE) is connected and fixed to the input shaft (6); a first input gear (8) is arranged on the input shaft (6); the first motor (4) is connected and fixed to the first motor shaft (2); a first driven gear (3) is arranged on the first motor shaft (2); the first driven gear (3) meshes with the first input gear (8); a differential main reduction gear (12) is circumferentially fixed on the differential (11); the second motor (22) is connected and fixed to the second motor shaft (21); a second driving gear (20) is arranged on the second motor shaft (21); an output driving gear (17) and a second driven gear (16) are arranged on the intermediate shaft (14); the output driving gear (17) meshes with the differential main reduction gear (12); and the second driven gear (16) meshes with the second driving gear (20).

2. The multi-mode dual-motor extended-range hybrid drive system according to claim 1 is characterized in that: The first motor shaft (2), the second motor shaft (21), the input shaft (6) and the intermediate shaft (14) are parallel to each other.

3. The multi-mode dual-motor extended-range hybrid drive system according to claim 1 is characterized in that: Both ends of the input shaft (6) are supported by a first ball bearing (9) and a second ball bearing (7).

4. The multi-mode dual-motor extended-range hybrid drive system according to claim 1 is characterized in that: Both ends of the first motor shaft (2) are supported by a first column bearing (1) and a third ball bearing (5).

5. The multi-mode dual-motor extended-range hybrid drive system according to claim 1 is characterized in that: The differential main reduction gear (12) is circumferentially fixed on the differential (11), and both ends of the differential (11) are supported by a first tapered bearing (13) and a second tapered bearing (10).

6. The multi-mode dual-motor extended-range hybrid drive system according to claim 1 is characterized in that: Both ends of the second motor shaft (21) are supported by a fourth ball bearing (23) and a second column bearing (19).

7. The multi-mode dual-motor extended-range hybrid drive system according to claim 1, characterized in that: The two ends of the intermediate shaft (14) are supported by a third tapered bearing (18) and a fourth tapered bearing (15).

8. The multi-mode dual-motor extended-range hybrid drive system according to claim 1, characterized in that: The first motor shaft (2) and the first driven gear (3) are integrally formed.

9. The multi-mode dual-motor extended-range hybrid drive system according to claim 1, characterized in that: The second motor shaft (21) and the second input gear (20) are integrally formed.

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