Dual-motor hybrid drive system and hybrid vehicle

Abstract

The present invention discloses a dual-motor hybrid drive system and a hybrid vehicle, including an engine, a first motor, a second motor, and a transmission, wherein the transmission includes a first input shaft assembly, an intermediate shaft assembly, a second input shaft assembly, and a differential, wherein the second motor is directly connected to the engine and can be directly used to start the engine, and the engine can also directly charge the second motor. Because the engine and the second motor are directly connected without intermediate gear transmission, the transmission efficiency and power generation efficiency are relatively high. During the gear shifting process, the first motor is used to compensate for the torque, and the power will not be interrupted during the gear shifting process, and the driving performance is excellent. The first motor output has two gears, which can better utilize the high-efficiency range of the motor to achieve a higher pure electric vehicle speed and a stronger pure electric driving force, so as to better adapt to various different working conditions.

Description

Technical Field

[0001] The present invention relates to the field of vehicles, and in particular to a dual-motor hybrid power drive system and a hybrid power vehicle. Background Art

[0002] With the increasing shortage of oil supply and the increasing environmental pollution, the development and utilization of new energy vehicles has gradually become a trend. Among them, hybrid vehicles in new energy vehicles can be driven by engines or motors or both engines and motors at the same time, with multiple driving modes, so that the engine and motor can operate in the high efficiency range as much as possible, thus having good fuel economy and low emissions.

[0003] Representative dual-motor systems currently known include SAIC EDU and Toyota's E-CVT, which are hybrid transmission systems. Toyota's E-CVT includes two motors and a planetary gear transmission device. Its power transmission route is: 1) Engine drive: engine-first motor-planetary gear set-outer gear ring-output shaft, 2) Pure electric drive: second motor-outer gear ring-output shaft, 3) Hybrid drive: engine-first motor combined with second motor-planetary gear set-outer gear ring-output shaft. The advantages of this transmission system are smooth speed change, high transmission efficiency, and simple structure. The disadvantage is that it does not have a pure engine operation mode, and the transmission ratio of the motor is fixed and cannot be changed.

[0004] SAIC EDU includes an engine, a generator motor, a drive motor, two clutches and a two-speed transmission gear set. Since the engine and the two motors are coaxially arranged, the power motor is arranged on the input shaft and cannot compensate for the torque at the output end. Therefore, the torque needs to be interrupted when shifting gears, and the gear shifting comfort is poor. Summary of the invention

[0005] The purpose of the present invention is to provide a dual-motor hybrid power drive system and a hybrid vehicle in view of the deficiencies in the prior art. The dual-motor hybrid power drive system of the present invention has many advantages such as high transmission efficiency, compact structure, light weight, etc. It alleviates the power interruption problem that occurs when shifting gears in a conventional transmission in engine drive and hybrid drive modes, improves the shifting comfort, and ensures that the vehicle has good power and shifting characteristics. In pure electric conditions, there are two motor gears, and the gears are variable, which ensures that the vehicle has good economy and reduces vehicle fuel consumption and pollutant emissions.

[0006] The objective of the present invention is achieved by adopting the following scheme: The present invention discloses a dual-motor hybrid power drive system, including an engine, a first motor, a second motor, and a transmission, wherein the transmission includes a first input shaft assembly, an intermediate shaft assembly, a second input shaft assembly, and a differential, wherein the first input shaft assembly includes a first input shaft, and the first input shaft is a hollow shaft, the engine and the second motor are respectively located at two ends of the first input shaft, the output shaft of the engine is fixedly connected to the motor shaft of the second motor, the output shaft of the engine is connected to the first input shaft through a clutch, a first-speed input gear and a second-speed input gear are provided on the first input shaft, the intermediate shaft assembly includes an intermediate shaft, a first-speed output gear, a second-speed output gear, a first-speed output gear of the motor, and a second-speed output gear of the motor are hollowly sleeved on the intermediate shaft, the first-speed output gear is meshed with the first-speed input gear to form a first-speed gear pair, and the second-speed output gear is meshed with the second-speed output gear to form a first-speed gear pair. The first gear output gear and the second gear output gear mesh with each other to form a second gear gear pair. A first and second gear synchronizer is provided between the first gear output gear and the second gear output gear. The first and second gear synchronizer is fixedly connected to the intermediate shaft. A motor gear synchronizer is provided between the first gear output gear of the motor and the second gear output gear of the motor. The motor gear synchronizer is fixedly connected to the intermediate shaft. The second input shaft assembly includes a second input shaft. A motor first gear input gear, a motor second gear input gear and a motor intermediate gear are provided on the second input shaft. The motor first gear input gear meshes with the motor first gear output gear to form a motor first gear gear pair. The motor second gear input gear meshes with the motor second gear output gear to form a motor second gear gear pair. The motor intermediate gear meshes with the motor input gear. The motor input gear is fixedly provided on the motor shaft of the first motor. A constant meshing gear is provided on the intermediate shaft. The constant meshing gear meshes with the input gear of the differential or the constant meshing gear meshes with the input gear of the differential via the output gear. The first gear input gear and the second gear input gear are circumferentially fixedly connected to the first input shaft, and can also be integrally formed with the first input shaft as a whole, and are provided as needed. The constant meshing gear is circumferentially fixedly connected to the intermediate shaft, or it can be integrally formed with the intermediate shaft as a whole, and it can be set as needed. The motor intermediate gear is circumferentially fixedly connected to the second input shaft, or it can be integrally formed with the second input shaft as a whole, and it can be set as needed. The motor first gear input gear and the motor second gear input gear are circumferentially fixedly connected to the second input shaft, or they can be integrally formed with the second input shaft as a whole, and they can be set as needed. The output gear is circumferentially fixedly connected to the output shaft, or it can be integrally formed with the output shaft as a whole, and it can be set as needed.

[0007] The present invention discloses a dual-motor hybrid power drive system, comprising an engine, a first motor, a second motor, and a transmission, wherein the transmission comprises a first input shaft assembly, an intermediate shaft assembly, a second input shaft assembly, and a differential, wherein the first input shaft assembly comprises a first input shaft, wherein the first input shaft is a hollow shaft, wherein the engine and the second motor are respectively located at two ends of the first input shaft, wherein the output shaft of the engine is fixedly connected to the motor shaft of the second motor, wherein the output shaft of the engine is connected to the first input shaft through a clutch, wherein a first-speed input gear and a second-speed input gear are arranged on the first input shaft, wherein the intermediate shaft assembly comprises an intermediate shaft, wherein a first-speed output gear and a second-speed output gear are hollowly sleeved on the intermediate shaft, wherein a first-speed output gear and a second-speed output gear are arranged between the first-speed output gear and the second-speed output gear, wherein the first-speed synchronizer and the second-speed synchronizer are fixedly connected to the intermediate shaft, wherein the first-speed output gear meshes with the first-speed input gear to form a first-speed gear pair, and the second-speed output gear meshes with the second-speed output gear to form a first-speed gear pair. The first gear input gear and the second gear input gear of the motor are meshed to form a second gear gear pair. The intermediate shaft is also provided with a motor first gear output gear and a motor second gear output gear. The second input shaft assembly includes a second input shaft. The second input shaft is sleeved with a motor first gear input gear and a motor second gear input gear. A motor gear synchronizer is provided between the motor first gear input gear and the motor second gear input gear. The motor gear synchronizer is fixedly connected to the second input shaft. The motor first gear input gear is meshed with the motor first gear output gear to form a motor first gear gear pair. The motor second gear input gear is meshed with the motor second gear output gear to form a motor second gear gear pair. The second input shaft is also provided with a motor intermediate gear. The motor intermediate gear is meshed with the motor input gear. The motor input gear is fixedly arranged on the motor shaft of the first motor. The intermediate shaft is also provided with a constant meshing gear. The constant meshing gear is meshed with the input gear of the differential or the constant meshing gear is meshed with the input gear of the differential via the output gear. The first gear input gear and the second gear input gear are circumferentially fixedly connected to the first input shaft, and can also be integrally formed with the first input shaft as a whole, and are arranged as needed. The constant meshing gear is circumferentially fixedly connected to the intermediate shaft, or it can be integrally formed with the intermediate shaft as a whole, and it can be set as needed. The motor first gear output gear and the motor second gear output gear are circumferentially fixedly connected to the intermediate shaft, or it can be integrally formed with the intermediate shaft as a whole, and it can be set as needed. The motor intermediate gear is circumferentially fixedly connected to the second input shaft, or it can be integrally formed with the second input shaft as a whole, and it can be set as needed.

[0008] The output gear is fixedly connected to the output shaft in the circumferential direction, and can also be integrally formed with the output shaft as a whole, and can be arranged as required.

[0009] Furthermore, the clutch comprises a clutch outer hub and a clutch inner hub, the clutch outer hub of the clutch is fixedly connected to the output shaft of the engine, and the clutch inner hub of the clutch is fixedly connected to the first input shaft.

[0010] Furthermore, both ends of the intermediate shaft are supported in the transmission housing through bearings.

[0011] Furthermore, both ends of the second input shaft are supported in the transmission housing through bearings.

[0012] Furthermore, the output gear is fixed on the output shaft; the output shaft is supported in the housing of the transmission through bearings.

[0013] Furthermore, the axis center lines of the output shaft of the engine, the motor shaft of the second motor and the axis center line of the first input shaft are located on the same straight line.

[0014] The invention also discloses a hybrid vehicle, which adopts the dual-motor hybrid drive system.

[0015] The beneficial effects of the present invention are as follows: since the present invention has a motor drive mode, an engine drive mode, and a hybrid drive mode, when the motor works alone, the present invention can use the first motor to start, or use the second motor to start the engine under the conditions of speed and torque suitable for engine starting. When the engine and the motor are driven in a hybrid manner, the first or second gear of the engine can be selected in time to transmit power according to road conditions. When the engine works alone, the motor can be charged and fed back. During the gear shifting process, the present invention uses the first motor to compensate for the torque, and the power will not be interrupted during the gear shifting process, and the driving performance is excellent.

[0016] The present invention has two motor gears, and the gears can be switched at any time according to different working conditions. Multiple motor transmission ratios can better adapt to various complex working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a first embodiment of a dual-motor hybrid drive system of the present invention;

[0018] Figure 2 is a structural schematic diagram of a second embodiment of a dual-motor hybrid drive system of the present invention;

[0019] Figure 3 This is a pure electric mode path diagram (1st gear) of the first embodiment of the present invention;

[0020] Figure 4 This is a pure electric mode path diagram (2nd gear) of the first embodiment of the present invention;

[0021] Figure 5 This is a pure engine mode path diagram (first gear) of the first embodiment of the present invention;

[0022] Figure 6 The pure engine mode path diagram (second gear) of the first embodiment of the present invention;

[0023] Figure 7 The hybrid power mode of the first embodiment of the present invention (engine first gear, motor first gear);

[0024] Figure 8 The hybrid power mode of the first embodiment of the present invention (engine second gear, motor first gear);

[0025] Fig. 9 The hybrid power mode of the first embodiment of the present invention (engine first gear, motor second gear);

[0026] Fig.10 This is the hybrid power mode of the first embodiment of the present invention (engine second gear, motor second gear). DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present invention clearer, detailed implementation modes are given, and the present invention will be further described in detail below in conjunction with the accompanying drawings:

[0028] Embodiment 1

[0029] See also Figure 1This embodiment discloses a dual-motor hybrid drive system, specifically including an engine 1, a clutch, a transmission, a first motor 7, and a second motor 4; the clutch includes a clutch outer hub 2-2 and a clutch inner hub 2-1; the transmission includes a first input shaft assembly 3, an intermediate shaft assembly 5, a second input shaft assembly 6, and a differential and output gear 15. The first input shaft assembly 3 includes a first input shaft 3-3, a first-gear input gear 3-1, and a second-gear input gear 3-3; the first-gear input gear 3-1 is fixedly connected to the first input shaft 3-3, and the second-gear input gear 3-3 is fixedly connected to the first input shaft 3-3. The first input shaft 3-3 is fixedly connected to the clutch inner hub 2-1; the engine 1 is fixedly connected to the clutch outer hub 2-2, and the second motor 4 is directly circumferentially fixedly connected to the engine 1; the axis center line of the output shaft of the engine 1 and the motor shaft of the second motor 4 is located on the same straight line as the axis center line of the first input shaft 3-3. The first input shaft 3-3 is a hollow shaft for the output shaft of the engine 1 or the motor shaft of the second motor 4 to extend into or pass through. The intermediate shaft assembly 5 includes an intermediate shaft 5-8, a constant meshing gear 5-1, a first gear output gear 5-2, a second gear output gear 5-4, a first and second gear synchronizer 5-3 and a motor gear synchronizer 5-6, a first gear output gear 5-5 of the motor, and a second gear output gear 5-7 of the motor; the intermediate shaft 5-8 is fixedly connected with the constant meshing gear 5-1, the first gear output gear 5-2 is loosely sleeved on the intermediate shaft 5-8 and idling on the intermediate shaft 5-8; the second gear output gear 5-4 is loosely sleeved on the intermediate shaft 5-8 and idling on the intermediate shaft 5-8; the first and second gear synchronizer 5-3 and the motor gear synchronizer 5-6 are fixedly connected with the first gear output gear 5-2 ...5 and idling on the intermediate shaft 5-8; the first and second gear synchronizer 5-3 and the motor gear synchronizer 5-6 are fixedly connected with the first gear output gear 5-2 and idling on the intermediate shaft 5-8; the first and second gear synchronizer 5-3 and the motor gear synchronizer 5-6 are fixedly connected 5-3 is fixedly connected to the intermediate shaft 5-8; the motor gear synchronizer 5-6 is fixedly connected to the intermediate shaft 5-8; the motor first gear output gear 5-5 and the motor second gear output gear 5-7 are idly sleeved on the intermediate shaft 5-8 and idly rotate on the intermediate shaft 5-8; the second input shaft assembly 6 includes a second input shaft 6-2, a motor first gear input gear 6-1, a motor second gear input gear 6-3 and a motor intermediate gear 6-4, and the motor first gear input gear 6-1, the motor second gear input gear 6-3 and the motor intermediate gear 6-4 are fixedly connected to the second input shaft 6-2;

[0030] The first gear input gear 3-1 is meshed with the first gear output gear 5-2 to form a first gear gear pair, and the second gear input gear 3-3 is meshed with the second gear output gear 5-4 to form a second gear gear pair; the motor first gear output gear 5-5 is meshed with the motor first gear input gear 6-1 to form a motor first gear gear pair, and the motor second gear output gear 5-7 is meshed with the motor second gear input gear 6-3 to form a motor second gear gear pair;

[0031] The constant meshing gear 5-1 is meshed with the output gear 15. The motor intermediate gear 6-4 is meshed with the motor input gear 7-1;

[0032] The first motor 7 is fixedly connected to a motor input gear 7-1;

[0033] The engine 1 may be a three-cylinder or four-cylinder engine 1, or may be an engine 1 of other series.

[0034] Furthermore, both ends of the intermediate shaft 5 - 8 are supported in the transmission housing through bearings.

[0035] Furthermore, both ends of the second input shaft 6 - 2 are supported in the transmission housing through bearings.

[0036] Furthermore, the output gear 15 is fixed on the output shaft; the output shaft is supported in the housing of the transmission through bearings.

[0037] Embodiment 2

[0038] See also Figure 2The present embodiment discloses a dual-motor hybrid power drive system, a dual-motor hybrid power drive system, characterized in that: it includes an engine 1, a first motor 7, a second motor 4, and a transmission, the transmission includes a first input shaft assembly 3, an intermediate shaft assembly 5, a second input shaft assembly 6 and a differential, the first input shaft assembly 3 includes a first input shaft 3-3, the first input shaft 3-3 is a hollow shaft, the engine 1 and the second motor 4 are respectively located at both ends of the first input shaft 3-3, and the output shaft of the engine 1 is fixedly connected to the motor shaft of the second motor 4, The output shaft of the engine 1 is connected to the first input shaft 3-3 through the clutch 2. The first input shaft 3-3 is provided with a first gear input gear 3-1 and a second gear input gear 3-2. The intermediate shaft assembly 5 includes an intermediate shaft 5-8. The intermediate shaft 5-8 is sleeved with a first gear output gear 5-2 and a second gear output gear 5-4. A first-second gear synchronizer 5-3 is provided between the first gear output gear 5-2 and the second gear output gear 5-4. The first-second gear synchronizer 5-3 is fixedly connected to the intermediate shaft 5-8. The first gear output gear 5-2 is meshed with the first gear input gear 3-1 to form a first gear output gear 5-2. The first gear gear pair, the second gear output gear 5-4 is meshed with the second gear input gear 3-2 to form a second gear gear pair, the intermediate shaft 5-8 is also provided with a motor first gear output gear 5-5 and a motor second gear output gear 5-7, the second input shaft assembly 6 includes a second input shaft 6-2, the second input shaft 6-2 is sleeved with a motor first gear input gear 6-1 and a motor second gear input gear 6-3, a motor gear synchronizer 6-5 is provided between the motor first gear input gear 6-1 and the motor second gear input gear 6-3, and the motor gear synchronizer 6-5 is fixedly connected to the second input shaft 6-2 The first gear input gear 6-1 of the motor is meshed with the first gear output gear 5-5 of the motor to form a first gear gear pair of the motor, the second gear input gear 6-3 of the motor is meshed with the second gear output gear 5-7 of the motor to form a second gear gear pair of the motor, the second input shaft 6-2 is further provided with a motor intermediate gear 6-4, the motor intermediate gear 6-4 is meshed with the motor input gear 7-1, the motor input gear 7-1 is fixed on the motor shaft of the first motor 7, the intermediate shaft 5-8 is further provided with a constant meshing gear 5-1, the constant meshing gear 5-1 is meshed with the output gear 15. Other technical features of this embodiment are the same as those of the first embodiment.

[0039] Embodiment 3

[0040] This embodiment provides a hybrid vehicle, which adopts the dual-motor hybrid drive system described in the first or second embodiment.

[0041] like Figure 1 As shown, the working principle of the present invention is as follows:

[0042] In this embodiment, all gears on the transmission can be used for the transmission of the first motor 7, the second motor 4 and the engine 1, and the synchronizer is used to add gear selection functions in three modes: pure electric drive mode, hybrid drive mode and pure engine 1. When the transmission is shifting, the first motor 7 transmits torque to the intermediate shaft 5-8, and the intermediate shaft 5-8 is constantly meshed with the gear 5-1 to output to the wheel end through the differential and the output gear 15, so as to prevent the torque from being interrupted during the shifting and improve the shifting comfort.

[0043] like Figure 3 Pure electric mode (first gear) shown:

[0044] The clutch is in a disengaged state, the steel plate of the clutch outer hub 2-22 and the friction plate of the clutch inner hub 2-13 are not combined, the first and second gear synchronizer 5-3 are in a neutral state, the motor gear synchronizer 5-6 slides toward the motor first gear output gear 5-55 and engages with the motor first gear output gear 5-5. At this time, the intermediate shaft 5-8 is fixedly connected to the motor first gear output gear 5-55. The first motor 7 is started and the power is input to the motor input gear. The motor input gear transmits the power to the motor first gear input gear 3-1-motor first gear output gear 5-5-intermediate shaft 5-8-constant meshing gear 5-1-differential and output gear 15 through the motor intermediate gear.

[0045] like Figure 4 Pure electric mode (second gear) shown:

[0046] The clutch is in a disengaged state, the steel plate of the clutch outer hub 2-2 and the friction plate of the clutch inner hub 2-1 are not combined, the first and second gear synchronizers 5-3 are in a neutral state, the motor gear synchronizer 5-6 slides toward the motor second gear output gear 5-7 and engages with the motor second gear output gear 5-7. At this time, the intermediate shaft 5-8 is fixedly connected to the motor second gear output gear 5-7. The first motor 7 is started and the power is input to the motor input gear. The motor input gear transmits the power to the motor second gear input gear 3-3-motor second gear output gear 5-7-intermediate shaft 5-8-constant meshing gear 5-1-differential and output gear 15 through the motor intermediate gear.

[0047] like Figure 5 Shown in engine-only 1 mode (first gear)

[0048] The clutch is in an engaged state, the steel plate of the clutch outer hub 2-2 and the friction plate of the clutch inner hub 2-1 are engaged, the first and second gear synchronizers 5-3 slide toward the first gear output gear 5-2, and the first and second gear synchronizers 5-3 are engaged with the first gear output gear 5-2. At this time, the first gear output gear 5-2 and the first and second gear synchronizers 5-3 are fixed together, the first motor 7 is turned off, the engine 1 is started, the engine 1 transmits power to the clutch inner hub 2-1 and the clutch outer hub 2-2, the clutch outer hub 2-2 transmits power to the first input shaft 3-3, the first input shaft 3-3 transmits power to the first gear input gear 3-1-first gear output gear 5-2-intermediate shaft 5-8-constant mesh gear 5-1-differential and output gear 15;

[0049] like Figure 6 Shown in pure engine 1 mode (second gear)

[0050] The clutch is in an engaged state, the steel plate of the clutch outer hub 2-2 and the friction plate of the clutch inner hub 2-1 are engaged, the first and second gear synchronizers 5-3 slide toward the second gear output gear 5-4, the first and second gear synchronizers 5-3 are engaged with the second gear output gear 5-4, at this time the second gear output gear 5-4 is fixedly connected with the first and second gear synchronizers 5-3, the first motor 7 is turned off, the engine 1 is started, the engine 1 transmits power to the clutch outer hub 2-2, the clutch outer hub 2-2 transmits power to the clutch inner hub 2-1-first input shaft 3-3-second gear input gear 3-3-second gear output gear 5-4-intermediate shaft 5-8-constant mesh gear 5-1-differential and output gear 15;

[0051] like Figure 7 Hybrid mode shown (engine 1st gear, motor 1st gear)

[0052] The clutch is in an engaged state, the steel plate of the clutch outer hub 2-2 and the friction plate of the clutch inner hub 2-1 are engaged, the first and second gear synchronizers 5-3 slide toward the first gear output gear 5-2, and the first and second gear synchronizers 5-3 are engaged with the first gear output gear 5-2. At this time, the first gear output gear 5-2 is fixedly connected with the first and second gear synchronizers 5-3. The motor gear synchronizer 5-6 slides toward the motor first gear output gear 5-5 and is engaged with the motor first gear output gear 5-5. At this time, the intermediate shaft 5-8 is fixedly connected with the motor first gear output gear 5-5 Together, the engine 1 starts, the first motor 7 starts, the engine 1 transmits power to the clutch outer hub 2-2-clutch inner hub 2-1-first input shaft 3-3-first gear input gear 3-1-first gear output gear 5-2-intermediate shaft 5-8-constant mesh gear 5-1-differential and output gear 15, the first motor 7 transmits power to the motor input gear-motor first gear input gear 3-1-motor first gear output gear 5-5-intermediate shaft 5-8-constant mesh gear 5-1-differential and output gear 15. The engine 1 and the motor transmit power at the same time.

[0053] like Figure 8 Hybrid mode shown (engine 1 second gear, motor 1st gear)

[0054] The clutch is in an engaged state, the steel plate of the clutch outer hub 2-2 and the friction plate of the clutch inner hub 2-1 are engaged, the first and second gear synchronizers 5-3 slide toward the second gear output gear 5-4, the first and second gear synchronizers 5-3 are engaged with the second gear output gear 5-4, at this time the second gear output gear 5-4 is fixedly connected with the first and second gear synchronizers 5-3, the motor gear synchronizer 5-6 slides toward the motor first gear output gear 5-5, and is engaged with the motor first gear output gear 5-5, at this time the intermediate shaft 5-8 is fixedly connected with the motor first gear output gear 5-5, The engine 1 is started, the first motor 7 is started, the engine 1 transmits power to the clutch outer hub 2-2-clutch inner hub 2-1-first input shaft 3-3-second gear input gear 3-3-second gear output gear 5-4-first and second gear synchronizer 5-3-intermediate shaft 5-8-constant mesh gear 5-1-differential and output gear 15, the first motor 7 transmits power to the motor input gear-motor first gear input gear 3-1-motor first gear output gear 5-5-intermediate shaft 5-8-constant mesh gear 5-1-differential and output gear 15. The engine 1 and the motor transmit power at the same time.

[0055] like Fig. 9 Hybrid mode shown (engine 1st gear, motor 2nd gear)

[0056] The clutch is in an engaged state, the steel plate of the clutch outer hub 2-2 and the friction plate of the clutch inner hub 2-1 are engaged, the first and second gear synchronizers 5-3 slide toward the first gear output gear 5-2, and the first and second gear synchronizers 5-3 are engaged with the first gear output gear 5-2. At this time, the first gear output gear 5-2 is fixedly connected with the first and second gear synchronizers 5-3, and the motor gear synchronizer 5-6 slides toward the motor second gear output gear 5-7 and is engaged with the motor second gear output gear 5-7. At this time, the intermediate shaft 5-8 is fixedly connected with the motor second gear output gear 5-7, and the engine 1 is started. , the first motor 7 is started, the engine 1 transmits power to the clutch outer hub 2-2-clutch inner hub 2-1-first input shaft 3-3-first gear input gear 3-1-first gear output gear 5-2-first and second gear synchronizer 5-3-intermediate shaft 5-8-constant mesh gear 5-1-differential and output gear 15, the first motor 7 transmits power to the motor input gear-motor second gear input gear 3-3-motor second gear output gear 5-7-motor gear synchronizer 5-6-intermediate shaft 5-8-constant mesh gear 5-1-differential and output gear 15. The engine 1 and the motor transmit power at the same time.

[0057] like Fig.10 Hybrid mode shown (engine 1 2nd gear, motor 2nd gear)

[0058] The clutch is in an engaged state, the steel plate of the clutch outer hub 2-2 and the friction plate of the clutch inner hub 2-1 are engaged, the first and second gear synchronizers 5-3 slide toward the second gear output gear 5-4, the first and second gear synchronizers 5-3 are engaged with the second gear output gear 5-4, at this time the second gear output gear 5-4 is fixedly connected with the first and second gear synchronizers 5-3, the motor gear synchronizer 5-6 slides toward the motor second gear output gear 5-7, and is engaged with the motor second gear output gear 5-7, at this time the intermediate shaft 5-8 is fixedly connected with the motor second gear output gear 5-7, and the engine 1 is started. , the first motor 7 is started, the engine 1 transmits power to the clutch outer hub 2-2-clutch inner hub 2-1-first input shaft 3-3-second gear input gear 3-3-second gear output gear 5-4-first and second gear synchronizer 5-3-intermediate shaft 5-8-constant mesh gear 5-1-differential and output gear 15, the first motor 7 transmits power to the motor input gear-motor second gear input gear 3-3-motor second gear output gear 5-7-motor gear synchronizer 5-6-intermediate shaft 5-8-constant mesh gear 5-1-differential and output gear 15. The engine 1 and the motor transmit power at the same time.

[0059] Power recovery mode

[0060] The clutch is disconnected, the engine 1 and the second motor 4 stop running, the motor gear synchronizer 5-6 on the intermediate shaft 5-8 is engaged with the motor first gear output gear 5-5 or the motor second gear output gear 5-7, the synchronizer on the transmission is disconnected from the gear gear of the corresponding gear, and the first motor 7 is in operation. During braking or sliding, the differential and output gear 15 transmit power through the intermediate shaft 5-8-motor gear synchronizer 5-6-motor first gear output gear 5-5 or motor second gear output gear 5-7-motor first gear input gear 3-1 or motor second gear input gear 3-3-motor intermediate gear-motor input gear-first motor 7, so that the first motor 7 charges the battery.

[0061] The clutch is engaged, the steel plate of the clutch outer hub 2-2 and the friction plate of the clutch inner hub 2-1 are engaged, the first and second gear synchronizer 5-3 slide toward the first gear output gear 5-2, and the first and second gear synchronizer 5-3 are engaged with the first gear output gear 5-2. At this time, the first gear output gear 5-2 is fixedly connected with the first and second gear synchronizer 5-3. During braking, the power passes through the differential and output gear 15-constant meshing gear 5-1-intermediate shaft 5-8-first and second gear synchronizer 5-3-first gear output gear 5-2-first gear input gear 3-1-first input shaft 3-3-clutch inner hub 2-1-clutch outer hub 2-2-second motor 4, so that the second motor 4 charges the battery.

[0062] The clutch is engaged, the steel plate of the clutch outer hub 2-2 and the friction plate of the clutch inner hub 2-1 are engaged, the first and second gear synchronizer 5-3 slides toward the second gear output gear 5-4, and the first and second gear synchronizer 5-3 is engaged with the second gear output gear 5-4. At this time, the second gear output gear 5-4 is fixedly connected with the first and second gear synchronizer 5-3. During braking, the power passes through the differential and output gear 15-constant meshing gear 5-1-intermediate shaft 5-8-first and second gear synchronizer 5-3-second gear output gear 5-4-second gear input gear 3-3-first input shaft 3-3-clutch inner hub 2-1-clutch outer hub 2-2-second motor 4, so that the second motor 4 charges the battery.

[0063] Charging Mode

[0064] In the hybrid mode and the pure engine 1 mode, the engine 1 and the second motor 4 are directly connected together. As long as the engine 1 starts running, the power will be directly transmitted to the second motor 4, so that the second motor 4 charges the battery.

[0065] The clutch is in an engaged state, the steel plate of the clutch outer hub 2-2 and the friction plate of the clutch inner hub 2-1 are engaged, the first and second gear synchronizers 5-3 slide toward the first gear output gear 5-2 or the second gear output gear 5-4, the first and second gear synchronizers 5-3 are engaged with the first gear output gear 5-2 or the second gear output gear 5-4, at this time, the first gear output gear 5-2 or the second gear output gear 5-4 is fixedly connected with the first and second gear synchronizers 5-3, the motor gear synchronizer 5-6 slides toward the motor first gear output gear 5-5 or the motor second gear output gear 5-7, at this time, the intermediate shaft 5-8 is fixedly connected with the motor first gear output gear 5-5 or the motor second gear output gear 5-7, and the engine Engine 1 starts, engine 1 transmits power to clutch outer hub 2-2, clutch outer hub 2-2 transmits power to clutch outer hub 2-2, clutch outer hub 2-2 is fixedly connected to first input shaft 3-3, first input shaft 3-3 transmits power to first gear input gear 3-1 or second gear input gear 3-3-first gear output gear 5-2 or second gear output gear 5-4-intermediate shaft 5-8-motor gear synchronizer 5-6-motor first gear output gear 5-5 or motor second gear output gear 5-7-motor first gear input gear 3-1 or motor second gear input gear 3-3-motor intermediate gear-motor input gear-first motor 7, so that first motor 7 charges the battery.

[0066] The second motor 4 starts the engine 1 mode:

[0067] The second motor 4 is running, the clutch is disconnected, and the second motor 4 transmits power to the engine 1 to start the engine 1.

[0068] The first motor 7 starts the engine 1 mode:

[0069] The clutch is in an engaged state, the steel plate of the clutch outer hub 2-2 and the friction plate of the clutch inner hub 2-1 are engaged, the first and second gear synchronizers 5-3 slide toward the first gear output gear 5-2 or the second gear output gear 5-4, the first and second gear synchronizers 5-3 are engaged with the first gear output gear 5-2 or the second gear output gear 5-4, at this time, the first gear output gear 5-2 or the second gear output gear 5-4 is fixedly connected with the first and second gear synchronizers 5-3, the motor gear synchronizer 5-6 slides toward the motor first gear output gear 5-5 or the motor second gear output gear 5-7, at this time The intermediate shaft 5-8 is fixedly connected with the motor first gear output gear 5-5 or the motor second gear output gear 5-7. When the first motor 7 is started, the first motor 7 transmits power to the motor input gear-motor intermediate gear-motor first gear output gear 5-5 or motor second gear output gear 5-7-intermediate shaft 5-8-first and second gear synchronizer 5-3-first gear output gear 5-2 or second gear output gear 5-4-first input shaft 3-3-clutch inner hub 2-1-clutch outer hub 2-2-engine 1, and power is transmitted to engine 1, thereby starting engine 1.

[0070] In this embodiment, when the first and second gear synchronizer 5-3 acts on the first gear output gear 5-2, the first gear output gear 5-2 is fixedly connected to the intermediate shaft 5-8, and the first gear output gear 5-2 and the first gear input gear 3-1 are always in meshing state, forming a first gear gear pair;

[0071] In this embodiment, when the first and second gear synchronizer 5-3 acts on the second gear output gear 5-4, the second gear output gear 5-4 is fixedly connected to the intermediate shaft 5-8, and the second gear output gear 5-4 and the second gear input gear 3-3 are always in meshing state, forming a second gear gear pair;

[0072] In this embodiment, when the motor gear synchronizer 5-6 acts on the motor first gear output gear 5-5, the motor first gear output gear 5-5 is fixedly connected to the intermediate shaft 5-8, and the motor first gear output gear 5-5 and the motor first gear input gear 3-1 are always in meshing state, forming the motor first gear gear pair;

[0073] In this embodiment, when the motor gear synchronizer 5-6 acts on the motor second gear output gear 5-75-4, the motor second gear output gear 5-7 is fixedly connected to the intermediate shaft 5-8, and the motor second gear output gear 5-7 and the motor second gear input gear 3-3 are always in meshing state, forming the motor second gear gear pair;

[0074] In this embodiment, the reverse gear function is realized by the reverse rotation of the first motor 7;

[0075] In this embodiment, during power generation or energy recovery, if the speed of the first motor 7 exceeds the maximum design limit speed, the motor gear synchronizer 5-6 is disconnected, cutting off the power transmission route of the first motor 7 to protect the first motor 7.

[0076] The dual-motor hybrid drive system of the present invention includes two motors, wherein the second motor is directly connected to the engine and can be directly used to start the engine. The engine can also directly charge the second motor. Because the engine and the second motor are directly connected without intermediate gear transmission, the transmission efficiency and power generation efficiency are relatively high. During the gear shifting process, the first motor is used to compensate for the torque, and the power will not be interrupted during the gear shifting process, and the driving performance is excellent. The first motor output has two gears, which can better utilize the high-efficiency range of the motor to achieve a higher pure electric vehicle speed and a stronger pure electric driving force, so as to better adapt to various different working conditions.

[0077] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A dual-motor hybrid drive system, characterized in that: The invention comprises an engine (1), a first motor (7), a second motor (4), and a transmission, wherein the transmission comprises a first input shaft assembly (3), an intermediate shaft assembly (5), and a second input shaft assembly (6), wherein the first input shaft assembly (3) comprises a first input shaft (3-3), wherein the first input shaft (3-3) is a hollow shaft, wherein the engine (1) and the second motor (4) are respectively located at two ends of the first input shaft (3-3), wherein the output shaft of the engine (1) is fixedly connected to the motor shaft of the second motor (4), wherein the output shaft of the engine (1) is connected to the first input shaft (3-3) via a clutch (2 ... first input shaft (3-3) is a hollow shaft, wherein the first input shaft (3-3) is a hollow shaft, wherein the first input shaft (3-3) is a hollow shaft, wherein the first input shaft (3-3) is a hollow shaft, wherein the first input shaft (3-3) is a hollow shaft, wherein the first input shaft (3-3) is a hollow shaft, wherein the first input shaft (3-3) is a hollow shaft, wherein the first input shaft (3-3) is a hollow shaft, wherein the first input shaft (3-3) is a hollow shaft, wherein the first input shaft (3-3) is a hollow shaft, wherein the first input shaft (3-3) is a hollow shaft, wherein the first input shaft (3-3) is a hollow shaft, wherein the first input shaft (3-3) is a hollow A first gear input gear (3-1) and a second gear input gear (3-2) are provided on the first input shaft (3-3); the intermediate shaft assembly (5) comprises an intermediate shaft (5-8); a first gear output gear (5-2), a second gear output gear (5-4), a motor first gear output gear (5-5), and a motor second gear output gear (5-7) are sleeved on the intermediate shaft (5-8); the first gear output gear (5-2) meshes with the first gear input gear (3-1) to form a first gear gear pair; the second gear output gear (5-4) meshes with the second gear input gear (3-2) to form a second gear gear pair; the first gear output gear (5-2) meshes with the second gear input gear (3-2) to form a second gear gear pair; A first- and second-gear synchronizer (5-3) is provided between the first- and second-gear output gears (5-4), and the first- and second-gear synchronizer (5-3) is fixedly connected to an intermediate shaft (5-8). A motor gear synchronizer (5-6) is provided between the first-gear output gear (5-5) of the motor and the second-gear output gear (5-7), and the motor gear synchronizer (5-6) is fixedly connected to the intermediate shaft (5-8). The second input shaft assembly (6) comprises a second input shaft (6-2), and the second input shaft (6-2) is provided with a first-gear input gear (6-1), a second-gear input gear (6-3) of the motor, and an intermediate gear (6-4) of the motor. The first-gear input gear (6-1) of the motor and the second-gear input gear (6-3) of the motor are provided. 1) meshes with the motor first gear output gear (5-5) to form a motor first gear gear pair, the motor second gear input gear (6-3) meshes with the motor second gear output gear (5-7) to form a motor second gear gear pair, the motor intermediate gear (6-4) meshes with the motor input gear (7-1), the motor input gear (7-1) is fixedly arranged on the motor shaft of the first motor (7), the intermediate shaft (5-8) is provided with a constant meshing gear (5-1), the constant meshing gear (5-1) meshes with the input gear of the differential or the constant meshing gear (5-1) meshes with the input gear of the differential via the output gear (15).

2. A dual-motor hybrid drive system, characterized in that: The invention comprises an engine (1), a first motor (7), a second motor (4), and a transmission, wherein the transmission comprises a first input shaft assembly (3), an intermediate shaft assembly (5), a second input shaft assembly (6), and a differential, wherein the first input shaft assembly (3) comprises a first input shaft (3-3), wherein the first input shaft (3-3) is a hollow shaft, wherein the engine (1) and the second motor (4) are respectively located at two ends of the first input shaft (3-3), wherein the output shaft of the engine (1) is fixedly connected to the motor shaft of the second motor (4), wherein the output shaft of the engine (1) is connected to the first input shaft (3-3) via a clutch (2), and wherein the first input shaft ( A first gear input gear (3-1) and a second gear input gear (3-2) are provided on the intermediate shaft assembly (5), the intermediate shaft assembly (5) comprises an intermediate shaft (5-8), a first gear output gear (5-2) and a second gear output gear (5-4) are sleeved on the intermediate shaft (5-8), a first gear output gear (5-2) and a second gear output gear (5-4) are provided between the first gear output gear (5-2) and the second gear output gear (5-4), the first and second gear synchronizer (5-3) is fixedly connected to the intermediate shaft (5-8), the first gear output gear (5-2) meshes with the first gear input gear (3-1) to form a first gear gear pair, and the second gear output gear (5-4) meshes with the second gear input gear (3-2) to form a first gear gear pair. The intermediate shaft (5-8) is also provided with a motor first gear output gear (5-5) and a motor second gear output gear (5-7); the second input shaft assembly (6) comprises a second input shaft (6-2); a motor first gear input gear (6-1) and a motor second gear input gear (6-3) are sleeved on the second input shaft (6-2); a motor gear synchronizer (6-5) is provided between the motor first gear input gear (6-1) and the motor second gear input gear (6-3); the motor gear synchronizer (6-5) is fixedly connected to the second input shaft (6-2); the motor first gear input gear (6-1) is meshed with the motor first gear output gear (5-5); A motor first gear pair is formed, the motor second gear input gear (6-3) meshes with the motor second gear output gear (5-7) to form a motor second gear pair, the second input shaft (6-2) is also provided with a motor intermediate gear (6-4), the motor intermediate gear (6-4) meshes with the motor input gear (7-1), the motor input gear (7-1) is fixedly arranged on the motor shaft of the first motor (7), the intermediate shaft (5-8) is also provided with a constant meshing gear (5-1), the constant meshing gear (5-1) meshes with the input gear of the differential or the constant meshing gear (5-1) meshes with the input gear of the differential via the output gear (15).

3. The dual-motor hybrid drive system according to claim 1 or 2, characterized in that: The clutch (2) comprises a clutch outer hub (2-2) and a clutch inner hub (2-1), the clutch outer hub (2-2) of the clutch (2) being fixedly connected to the output shaft of the engine (1), and the clutch inner hub (2-1) of the clutch (2) being fixedly connected to the first input shaft (3-3).

4. The dual-motor hybrid drive system according to claim 1 or 2, characterized in that: Both ends of the intermediate shaft (5-8) are supported in the housing of the transmission through bearings.

5. The dual-motor hybrid drive system according to claim 1 or 2, characterized in that: Both ends of the second input shaft (6-2) are supported in a transmission housing via bearings.

6. The dual-motor hybrid drive system according to claim 1 or 2, characterized in that: The output gear (15) is fixed on the output shaft; the output shaft is supported in the housing of the transmission via a bearing.

7. The dual-motor hybrid drive system according to claim 1 or 2, characterized in that: The axis center lines of the output shaft of the engine (1), the motor shaft of the second motor (4), and the axis center line of the first input shaft (3-3) are located on the same straight line.

8. A hybrid vehicle, characterized in that: A dual-motor hybrid drive system as claimed in claim 1 or 2 is adopted.

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