Dual-motor two-gear power dividing driving system

Abstract

The invention belongs to the technical field of vehicle hybrid power systems, and provides a dual-motor two-gear power dividing driving system which is provided with a power generation motor and a driving motor, and a planetary power dividing mechanism is arranged between the power generation motor and an engine. The planetary power dividing mechanism transmits redundant part power of the engine to the power generation motor for power generation, the other part of power is coupled with power transmitted to the output shaft by the driving motor to drive a vehicle, double-motor hybrid power is achieved, the oil saving efficiency of the driving system is improved, and the pause feeling generated by power interruption of the driving motor in the gear shifting process can be reduced. Power source switching is realized by adopting a speed change device and a planetary power dividing mechanism; due to the fact that vehicle power can be provided by power coupling of the driving motor and the engine, the engine can be maintained in an efficient working area by changing the proportion of the power provided by the driving motor in total power.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle hybrid power systems, and in particular provides a dual-motor two-speed power split drive system. Background Art

[0002] Hybrid technology can significantly reduce fuel consumption and exhaust emissions through the synergy of electric motors and internal combustion engines. Traditional single-motor multi-speed hybrids can only use engine drive mode when the battery power is insufficient, which has poor fuel saving efficiency, and both engine drive and motor drive have the problem of frustration caused by power interruption during gear shifting. When other hybrid power transmission schemes are applied to commercial vehicles, the speed ratio adjustment ability is limited, it is difficult to take into account the low-speed climbing ability and the maximum vehicle speed, and it is impossible to effectively utilize the engine's efficient working area or realize the engine direct drive function. Prior art CN116198312A provides a two-speed longitudinal rear-drive dual-motor hybrid system, including an engine, a generator, a drive motor, an engine intermediate shaft, a transmission shaft, a first synchronizer, and a second synchronizer. The engine and the generator are connected through an engine input shaft, and the engine input shaft, the engine intermediate shaft, and the output shaft are located on the same axis. The first synchronizer is installed on the output shaft, and the first synchronizer controls the disconnection and combination of the engine intermediate shaft and the output shaft power. The output shaft is also equipped with a second synchronizer, and the transmission shaft is connected to the output shaft through two gear sets with different speed ratios. The second synchronizer controls the interruption of the connection and the speed ratio of the connection. In the prior art transmission device, there is a short-term power interruption during the gear shifting process, and there is an obvious sense of frustration. The engine maintains a small range of efficient working state. The inventor believes that there is a large room for improvement in the prior art. Summary of the invention

[0003] The purpose of the present invention is that the first-gear and second-gear switching structure can take into account the climbing performance and maximum speed requirements of the whole vehicle, and can adjust the generator speed to maintain the engine in an efficient working area. Secondly, part of the engine power is used for vehicle driving, and the redundant part can be used for vehicle power generation, thereby maximizing fuel efficiency and avoiding the sense of frustration caused by power interruption during gear shifting. To this end, the present invention provides a dual-motor two-gear power split drive system, including an input shaft, an output shaft and an engine, the drive system is provided with a generator motor and a drive motor, a planetary power split mechanism is provided between the generator motor and the engine, and a speed change device is provided between the drive motor and the output shaft; the input end of the input shaft is connected to the engine, the output end of the input shaft is connected to the planetary power split mechanism, and the output shaft is connected to the planetary power split mechanism. The generator motor and the drive motor are combined with a planetary power split mechanism. The planetary power split mechanism transmits the redundant power of the engine to the generator motor for power generation, and the other part is coupled with the power transmitted to the output shaft by the drive motor to drive the vehicle, realizing dual-motor hybrid and improving the fuel-saving efficiency of the drive system; the gear shifting is realized by meshing different gear pairs of the speed change device and the planetary power split mechanism, which improves the low-speed climbing ability of the vehicle and meets the maximum speed requirement; the speed change device and the planetary power split mechanism are used to realize the switching of power sources. When the speed change device is in neutral, the drive motor is disconnected from the input end of the output shaft, and the engine can directly drive the vehicle through the output shaft. When the vehicle is driving and the transmission is in the first gear or the second gear, the power of the drive motor is coupled with the power of the engine at the output shaft; since the vehicle power can be provided by the power coupling of the drive motor and the engine, the proportion of the power provided by the drive motor in the total power can be changed to maintain the engine in the high-efficiency working area, thereby improving the fuel-saving efficiency of the drive system; since there is a short-term power interruption of the drive motor during the gear shifting process of the transmission, a planetary power splitting mechanism is used to cooperate with the engine and the drive motor to provide power to the output shaft through power coupling, and appropriate power compensation can be performed through the engine to reduce the sense of frustration caused by the power interruption of the drive motor during the gear shifting process.

[0004] Preferably, the planetary power splitting mechanism includes a planetary carrier assembly and a ring gear, the output end of the input shaft is connected to the planetary carrier assembly, and the ring gear is connected to the input end of the output shaft. The output end of the input shaft is connected to the planetary carrier assembly and indirectly connected to the output shaft by gear transmission, so that the output end power of the input shaft is coupled with the input end power of the output shaft; the ring gear is connected to the input end of the output shaft to realize the power splitting of the engine, so that part of the engine power is used for the output shaft, and the redundant power is used for the generator motor, so as to improve the fuel saving efficiency of the drive system and maintain the engine in the high-efficiency working area.

[0005] Preferably, the rotor shaft of the generator motor is provided with a brake, the movable end of the brake is connected to the rotor shaft of the generator motor, and the fixed end of the brake is fixed to the housing of the drive system. The engagement and disengagement of the brake realizes the stopping and rotation of the sun gear of the planetary power splitting mechanism. When parking and generating electricity, the speed change device is in the neutral position, the drive motor does not work, and the brake is disengaged. Since the vehicle is in a stationary state, the ring gear of the planetary power splitting mechanism cannot rotate, the power is input from the planetary carrier assembly, and the sun gear is output, and the generator motor realizes parking and generating electricity.

[0006] Preferably, the driving motor includes a driving gear shaft and a driven gear shaft, and a speed change device is provided between the driving gear shaft and the driven gear shaft. The driving motor realizes the change of transmission ratio through the driving gear shaft and the driven gear shaft; the speed change device is used to control the transmission ratio of the driving gear shaft and the driven gear shaft, thereby improving the speed ratio adjustment capability and taking into account the low-speed climbing capability and maximum vehicle speed requirements of the vehicle.

[0007] Preferably, an oil pump is arranged on the planetary carrier assembly and the input shaft, an oil channel is arranged inside the input shaft, the oil channel is provided with at least two oil outlets, and the oil channel is connected to the generator motor. The arrangement of the oil pump on the planetary carrier assembly and the input shaft facilitates the lubrication of the internal parts in the drive system casing and the cooling of the motor; the oil channel is arranged inside the input shaft to shorten the distance that the oil pump pumps the oil to the generator motor and each gear pair, thereby improving the cooling efficiency of the generator motor and maintaining the lubrication state of the internal parts for a long time.

[0008] Preferably, a torsional damper is provided between the engine and the input shaft. The use of a torsional damper can reduce the torsional stiffness of the joint between the engine crankshaft and the input shaft, reduce the torsional natural frequency of the transmission system, increase the torsional damping of the transmission system, suppress the amplitude corresponding to the torsional resonance, absorb the pulsation impact during the gear shifting process, and reduce the frustration of power interruption during the gear shifting process.

[0009] Preferably, a constant meshing gear pair is provided between the driven gear shaft and the output shaft of the driving motor. The constant meshing gear pair is provided between the driven gear shaft and the output shaft, which is beneficial to increase the output torque of the output shaft and improve the climbing ability of the vehicle.

[0010] Preferably, the speed change device is provided with at least two pairs of gear pairs, the gear pairs including a gear pair with a gear ratio greater than 1 and a gear pair with a gear ratio not exceeding 1. Gear pairs with different gear ratios correspond to different gears of the speed change device, respectively realizing the low-speed climbing capability of the vehicle and meeting the maximum speed requirement of the vehicle.

[0011] The present invention provides a dual-motor two-speed power split drive system, which can realize pure electric first gear, pure electric second gear, hybrid first gear, hybrid second gear, engine direct drive and parking power generation functions; the first gear and second gear switching structure can take into account the climbing performance and maximum speed requirements of the whole vehicle; the generator direct drive can make the generator still in the high-efficiency working area when the vehicle is at a high speed; in the hybrid mode, the generator speed can be adjusted to make the engine still in the high-efficiency working area; part of the engine power is used for vehicle driving, and the redundant part can be used for vehicle power generation, thereby maximizing the fuel saving efficiency and having the following beneficial effects: a generator motor and a drive motor are used in conjunction with a planetary power split mechanism, the planetary power split mechanism transmits the redundant part of the engine power to the generator motor for power generation, and the other part is coupled with the power transmitted to the output shaft by the drive motor to drive the vehicle, thereby realizing dual-motor hybrid to improve the fuel saving efficiency of the drive system; different gear pairs of the transmission are meshed and the planetary power The shunt mechanism realizes gear switching, improves the vehicle's low-speed climbing ability and meets the maximum speed requirement; the speed change device and the planetary power shunt mechanism are used to realize power source switching. When the speed change device is in neutral, the drive motor is disconnected from the input end of the output shaft, and the engine can directly drive the vehicle through the output shaft. When the speed change device is in the first gear position or the second gear position, the power of the drive motor is coupled with the power of the engine at the output shaft; since the vehicle power can be provided by the power coupling of the drive motor and the engine, the proportion of the power provided by the drive motor in the total power can be changed to keep the engine in the high-efficiency working area, thereby improving the fuel-saving efficiency of the drive system; since there is a short-term power interruption of the drive motor during the gear shifting process of the speed change device, the planetary power shunt mechanism is used to cooperate with the engine and the drive motor to provide power to the output shaft through power coupling, and appropriate power compensation can be performed through the engine to reduce the sense of frustration caused by the power interruption of the drive motor during the gear shifting process. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings described below are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0013] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a transmission schematic diagram of the pure electric first gear of the present invention; Figure 3 It is a transmission schematic diagram of the pure electric second gear of the present invention; Figure 4 It is a transmission schematic diagram of the hybrid first gear of the present invention; Figure 5 It is a transmission schematic diagram of the hybrid second gear of the present invention; Figure 6 It is a transmission schematic diagram of the engine direct drive of the present invention; Figure 7 It is a transmission schematic diagram of parking power generation of the present invention; Figure 8 Another structural schematic diagram of the present invention; Fig. 9 It is a partial enlarged view of the present invention.

[0014] Explanation of reference numerals: 1 engine; 2 torsional vibration damper; 3 planetary power split mechanism; 4 ring gear; 5 planet carrier assembly; 6 output shaft; 7 housing; 8 sun gear; 9 brake; 10 drive motor; 11 second gear position; 12 first gear position; 13 speed change device; 14 generator motor; 15 input shaft. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0016] Embodiment 1 Combination Figure 1 and Figure 8 As shown, a dual-motor two-speed power split drive system includes an engine 1, a torsional damper 2, a planetary power split mechanism 3, a ring gear 4, a planetary carrier assembly 5, an output shaft 6, a casing 7, a sun gear 8, a brake 9, a drive motor 10, a speed change device 13, a generator motor 14 and an input shaft 15. The drive system is provided with a generator motor 14 and a drive motor 10. A planetary power split mechanism 3 is provided between the generator motor 14 and the engine 1, and a speed change device 13 is provided between the drive motor 10 and the output shaft 6; an input end of the input shaft 15 is connected to the engine 1, an output end of the input shaft 15 is connected to the planetary power split mechanism 3, and the output shaft 6 is connected to the planetary power split mechanism 3.

[0017] In this embodiment, a generator motor 14 and a drive motor 10 are used in conjunction with a planetary power splitting mechanism 3. The planetary power splitting mechanism 3 includes a planetary carrier assembly 5, a sun gear 8 and a ring gear 4. The planetary carrier assembly 5 transmits the redundant power of the engine 1 to the generator motor 14 through the sun gear 8 for power generation, and the other part is transmitted to the power coupling on the output shaft 6 through the ring gear 4 and the drive motor 10 to drive the vehicle, thereby achieving the invention purpose of improving the fuel-saving efficiency of the drive system by dual-motor hybrid.

[0018] In this embodiment, different gear pairs of the speed change device 13 are meshed, that is, the first gear position 12 and the second gear position 11 are meshed, so as to realize gear switching, improve the low-speed climbing ability of the vehicle and meet the maximum vehicle speed requirement.

[0019] In this embodiment, a speed change device 13 and a planetary power splitting mechanism 3 are used to switch the power source, and three power modes of pure electric, hybrid and engine direct drive are realized. When the speed change device 13 is in neutral, the drive motor 10 is disconnected from the input end of the output shaft 6, and the engine 1 can directly drive the vehicle to travel through the output shaft 6. When the speed change device 13 is in the first gear position 12 or the second gear position 11, the power of the drive motor 10 is coupled with the power of the engine 1 at the output shaft 6 to drive the vehicle to travel. The engine 1 stops working, and the power of the drive motor 10 is reduced in speed and torque increased through a constant meshing gear pair to drive the vehicle to travel; since the vehicle power can be provided by the power coupling of the drive motor 10 and the engine 1, the proportion of the power provided by the drive motor 10 in the total power can be changed to keep the engine 1 in the high-efficiency working area, thereby improving the fuel-saving efficiency of the drive system.

[0020] In this embodiment, since there is a short period of power interruption in the drive motor 10 during the gear shifting process of the speed change device 13, a planetary power splitter mechanism 3 is used to cooperate with the engine 1 and the drive motor 10 to provide power to the output shaft 6 through power coupling. Appropriate power compensation can be performed through the engine 1, thereby achieving the purpose of the invention of reducing the sense of frustration caused by the power interruption of the drive motor 10 during the gear shifting process.

[0021] The planetary power splitting mechanism 3 includes a planet carrier assembly 5 and a ring gear 4. The output end of the input shaft 15 is connected to the planet carrier assembly 5, and the ring gear 4 is connected to the input end of the output shaft 6. The output end of the input shaft 15 is connected to the planet carrier assembly 5, and is indirectly connected to the output shaft 6 by gear transmission, so that the output end power of the input shaft 15 is coupled with the input end power of the output shaft 6; the ring gear 4 is connected to the input end of the output shaft 6 to realize the power splitting of the engine 1, so that part of the power of the engine 1 is used for the output shaft 6, and the redundant power is used for the generator motor 14, so as to improve the fuel saving efficiency of the drive system and maintain the engine 1 in the high-efficiency working area.

[0022] The rotor shaft of the generator motor 14 is provided with a brake 9, the movable end of the brake 9 is connected to the rotor shaft of the generator motor 14, and the fixed end of the brake 9 is fixed to the housing 7 of the drive system. The engagement and disengagement of the brake 9 realizes the stop and rotation of the sun gear 8 of the planetary power split mechanism 3. When parking and generating electricity, the speed change device 13 is in the neutral position, the drive motor 10 does not work, the brake 9 is disengaged, and since the vehicle is in a stationary state, the ring gear 4 of the planetary power split mechanism 3 cannot rotate, the power is input from the planetary carrier assembly 5, and the sun gear 8 is output, and the generator motor 14 realizes parking and generating electricity.

[0023] The driving motor 10 includes a driving gear shaft and a driven gear shaft, and a speed change device 13 is provided between the driving gear shaft and the driven gear shaft. The driving motor 10 realizes the change of the transmission ratio through the driving gear shaft and the driven gear shaft; the speed change device 13 is used to control the transmission ratio of the driving gear shaft and the driven gear shaft, thereby improving the speed ratio adjustment capability and taking into account the low-speed climbing capability and the maximum speed requirement of the vehicle.

[0024] Combination Figure 8 and Fig. 9 As shown, an oil pump is arranged on the planetary carrier assembly 5 and the input shaft 15, and an oil channel is arranged inside the input shaft 15, and the oil channel is provided with three oil outlets, and the oil channel is connected to the generator motor 14. The oil pump is arranged on the planetary carrier assembly 5 and the input shaft 15, which is convenient for lubrication of internal parts in the drive system housing 7 and cooling of the motor; the oil channel is arranged inside the input shaft 15 to shorten the distance for the oil pump to pump oil to the generator motor 14 and each gear pair, improve the cooling efficiency of the generator motor 14 and maintain the lubrication state of internal parts. Through the above arrangement, pure electric first gear, pure electric second gear, hybrid first gear, hybrid second gear, engine 1 direct drive and parking power generation functions are realized. In other embodiments, the oil pump can be arranged at other positions, for example, the oil pump is arranged at the output end of the engine 1, the oil pump is arranged at the input end of the output shaft 6, etc., the oil pump and the shaft are arranged coaxially, or the oil pump is arranged in parallel with the shaft through different transmission methods such as gears and sprocket chains.

[0025] A torsional damper 2 is provided between the engine 1 and the input shaft 15. The torsional damper 2 can reduce the torsional stiffness of the joint between the crankshaft of the engine 1 and the input shaft 15, reduce the torsional natural frequency of the transmission system, increase the torsional damping of the transmission system, suppress the amplitude corresponding to the torsional resonance, and reduce the frustration caused by power interruption during the gear shifting process.

[0026] A constant meshing gear pair is provided between the driven gear shaft of the driving motor 10 and the output shaft 6. The constant meshing gear pair is provided between the driven gear shaft and the output shaft 6, which is beneficial to increase the output torque of the output shaft 6 and improve the climbing ability of the vehicle.

[0027] The speed change device 13 is provided with two pairs of gear pairs, including a gear pair with a gear ratio greater than 1 and a gear pair with a gear ratio not exceeding 1. Gear pairs with different gear ratios correspond to different gears of the speed change device 13, respectively realizing the low-speed climbing capability of the vehicle and meeting the maximum speed requirement of the vehicle.

[0028] like Figure 2As shown, the arrow direction is the power transmission direction, wherein in pure electric first gear, the speed change device 13 is in the first gear position, and the drive motor 10 transmits power to the output shaft 6 through the gear pair in the first gear position, the driven gear shaft and the constant meshing gear pair of the output shaft 6. At this time, the engine 1 does not work, and the first motor rotates freely. The pure electric first gear can realize the forward and reverse functions of the vehicle by adjusting the driving rotation direction of the drive motor 10.

[0029] like Figure 3 As shown, the arrow direction is the power transmission direction. When the vehicle is in the second gear, the transmission device 13 is in the second gear position. The drive motor 10 transmits power to the output shaft 6 through the gear pair in the second gear position, the driven gear shaft and the constant meshing gear pair of the output shaft 6. The engine 1 does not work, and the generator motor 14 rotates freely. The second gear can also realize the forward and reverse functions of the vehicle by adjusting the driving rotation direction of the drive motor 10.

[0030] like Figure 4 As shown, the direction of the arrow is the power transmission direction. When the hybrid is in the first gear, the speed change device 13 is in the first gear position, and the drive motor 10 transmits power to the output shaft 6 through the gear pair in the first gear position, the driven gear shaft and the constant meshing gear pair of the output shaft 6. A part of the power of the engine 1 is transmitted to the output shaft 6 through the ring gear 4 through the planetary power splitting mechanism 3, and the redundant part of the power is used for the generator motor 14 to generate electricity. The power of the engine 1 and the drive motor 10 are coupled on the output shaft 6 to drive the vehicle.

[0031] like Figure 5 As shown, the direction of the arrow is the power transmission direction. When the hybrid is in the second gear, the speed change device 13 is in the second gear position, and the drive motor 10 transmits power to the output shaft 6 through the gear pair in the second gear position, the driven gear shaft and the constant meshing gear pair of the output shaft 6. A part of the power of the engine 1 is transmitted to the output shaft 6 through the ring gear 4 through the planetary power splitting mechanism 3, and the redundant part of the power is used for the generator motor 14 to generate electricity. The power of the engine 1 and the drive motor 10 is coupled on the output shaft 6 to drive the vehicle.

[0032] like Figure 6 As shown, the arrow direction is the power transmission direction. When the engine 1 is directly driven, the speed change device 13 is in the neutral position, that is, the gear pairs of the first gear position and the second gear position 11 are not engaged, the drive motor 10 does not work, the brake 9 locks the sun gear 8 and the generator motor 14 shaft, and the power of the engine 1 directly drives the vehicle to travel through the planetary power split mechanism 3.

[0033] like Figure 7 As shown, the direction of the arrow is the direction of power transmission, the speed change device 13 is in the neutral position, the drive motor 10 is not working, the brake 9 is disengaged, the vehicle is stationary, the ring gear 4 cannot rotate, the power is input from the planetary carrier assembly 5 to the sun gear 8, and the generator motor 14 generates electricity.

[0034] The present invention provides a dual-motor two-speed power split drive system, which can realize pure electric first gear, pure electric second gear, hybrid first gear, hybrid second gear, engine 1 direct drive and parking power generation functions; the first gear and second gear switching structure can take into account the climbing performance of the whole vehicle and the maximum speed requirement; the generator direct drive can make the generator still in the high-efficiency working area when the vehicle is at a high speed; in the hybrid mode, the generator speed can be adjusted to make the engine 1 still in the high-efficiency working area; part of the power of the engine 1 is used for vehicle driving, and the redundant part can be used for vehicle power generation, thereby maximizing the fuel saving efficiency and having the following beneficial effects: the generator motor 14 and the drive motor 10 are used in conjunction with the planetary power split mechanism 3, the planetary power split mechanism 3 transmits the redundant part of the power of the engine 1 to the generator motor 14 for power generation, and the other part is coupled with the power transmitted to the output shaft 6 by the drive motor 10 to drive the vehicle, thereby realizing dual-motor hybrid to improve the fuel saving efficiency of the drive system; the gear positions are realized by meshing different gear pairs of the speed change device 13 and the planetary power split mechanism 3 Switching improves the low-speed climbing ability of the vehicle and meets the maximum speed requirement; the speed change device 13 and the planetary power splitting mechanism 3 are used to realize the switching of the power source. When the speed change device 13 is in neutral, the drive motor 10 is disconnected from the input end of the output shaft 6, and the engine 1 can directly drive the vehicle to travel through the output shaft 6. When the speed change device 13 is in the first gear position 12 or the second gear position, the power of the drive motor 10 is coupled with the power of the engine 1 at the output shaft 6; since the vehicle power can be provided by the power coupling of the drive motor 10 and the engine 1, the proportion of the power provided by the drive motor 10 in the total power can be changed to keep the engine 1 in the high-efficiency working area, thereby improving the fuel-saving efficiency of the drive system; since there is a short-term power interruption of the drive motor 10 during the gear shifting process of the speed change device 13, the planetary power splitting mechanism 3 is used to cooperate with the engine 1 and the drive motor 10 to provide power to the output shaft 6 through power coupling, and appropriate power compensation can be performed through the engine 1 to reduce the sense of frustration caused by the power interruption of the drive motor 10 during the gear shifting process.

[0035] The above embodiments and / or implementation methods are only used to illustrate the preferred embodiments and / or implementation methods for realizing the technology of the present invention, and are not intended to limit the implementation methods of the technology of the present invention in any form. Any technical personnel in this field may make slight changes to other equivalent embodiments without departing from the scope of the technical means disclosed in the content of the present invention, but they should still be regarded as technologies or embodiments that are essentially the same as the present invention.

Claims

1. A dual-motor two-speed power split drive system, comprising an input shaft (15), an output shaft (6) and an engine (1), characterized in that: The drive system is provided with a generator motor (14) and a drive motor (10); a planetary power splitting mechanism (3) is provided between the generator motor (14) and the engine (1); a speed change device (13) is provided between the drive motor (10) and the output shaft (6); an input end of the input shaft (15) is connected to the engine (1), an output end of the input shaft (15) is connected to the planetary power splitting mechanism (3), and the output shaft (6) is connected to the planetary power splitting mechanism (3).

2. A dual-motor two-speed power split drive system according to claim 1, characterized in that: The planetary power splitting mechanism (3) comprises a planet carrier assembly (5) and a ring gear (4), the output end of the input shaft (15) is connected to the planet carrier assembly (5), and the ring gear (4) is connected to the input end of the output shaft (6).

3. A dual-motor two-speed power split drive system according to claim 1, characterized in that: The rotor shaft of the generator motor (14) is provided with a brake (9), the movable end of the brake (9) is connected to the rotor shaft of the generator motor (14), and the fixed end of the brake (9) is fixed to the housing (7) of the drive system.

4. A dual-motor two-speed power split drive system according to claim 1, characterized in that: The driving motor (10) comprises a driving gear shaft and a driven gear shaft, and a speed change device (13) is provided between the driving gear shaft and the driven gear shaft.

5. A dual-motor two-speed power split drive system according to claim 2, characterized in that: An oil pump is arranged on the planetary carrier assembly (5) and the input shaft (15); an oil channel is provided inside the input shaft (15); the oil channel is provided with at least two oil outlets; and the oil channel is connected to a generator motor (14).

6. A dual-motor two-speed power split drive system according to claim 1, characterized in that: A torsional vibration damper (2) is provided between the engine (1) and the input shaft (15).

7. A dual-motor two-speed power split drive system according to claim 5, characterized in that: A constantly meshing gear pair is provided between the driven gear shaft of the drive motor (10) and the output shaft (6).

8. A dual-motor two-speed power split drive system according to claim 7, characterized in that: The speed change device (13) is provided with at least two pairs of gear pairs, wherein the gear pairs include a gear pair with a gear ratio greater than 1 and a gear pair with a gear ratio not exceeding 1.

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