Plug-in hybrid powertrain and vehicle

Abstract

The present application provides a plug-in hybrid system and vehicle, which relates to the field of power systems, including an engine, a clutch, a first motor, a first reduction mechanism, a second motor, a second reduction mechanism, a first shift mechanism and a drive axle; the output shaft of the engine is connected to one end of the clutch, and the other end of the clutch is connected to the second motor through the second reduction mechanism; the other end of the clutch is also connected to the drive axle through the first shift mechanism, and the first shift mechanism is used to connect or disconnect the clutch from the drive axle; the drive axle is also connected to the first motor through the first reduction mechanism. The present application can realize multiple switching modes of oil-electric hybrid power and can be applied to various road conditions.

Description

Technical Field

[0001] The present application relates to the field of power systems, and in particular to a plug-in hybrid power system and a vehicle. Background Art

[0002] With the advancement of the country's dual carbon policy, the pressure on commercial vehicles to reduce carbon emissions is increasing. The number of commercial vehicles is large, and it is difficult to improve the thermal efficiency of small engines. Therefore, the pressure on commercial vehicles to reduce carbon emissions is relatively high.

[0003] The effective technology routes for reducing carbon emissions in commercial vehicles include zero-carbon engines, hybrid power, and pure electric vehicles. Zero-carbon engines are still immature, and the research focus is on high-horsepower engines. The pure electric technology route has a large battery weight, which greatly reduces the effective load during use. On the other hand, the pure electric technology route has a range that is difficult to meet the needs of users. Hybrid vehicles are mostly single series-parallel hybrid systems, and their adaptability to road conditions is too poor.

[0004] In view of the above-mentioned defects, there is an urgent need for a plug-in hybrid power system and a vehicle that can realize multiple switching modes of oil-electric hybrid power and can be suitable for various road conditions. Summary of the invention

[0005] The present application provides a plug-in hybrid power system and a vehicle, which can realize a variety of switching modes of oil-electric hybrid power and can be applied to a variety of road conditions.

[0006] In a first aspect, the present application provides a plug-in hybrid system, including an engine, a clutch, a first motor, a first reduction mechanism, a second motor, a second reduction mechanism, a first shift mechanism, and a drive axle; wherein

[0007] The output shaft of the engine is connected to one end of the clutch, and the other end of the clutch is connected to the second motor through the second reduction mechanism; the other end of the clutch is also connected to the drive axle through the first shifting mechanism, and the first shifting mechanism is used to realize or disconnect the connection between the clutch and the drive axle; the drive axle is also connected to the first motor through the first reduction mechanism.

[0008] In a possible design, the first shift mechanism is further connected to the drive axle via a second shift mechanism; the drive axle is further connected to the first reduction mechanism via the second shift mechanism;

[0009] The first shift mechanism is used to disconnect or connect the clutch with the second shift mechanism, and the second shift mechanism is used to disconnect or connect the first reduction mechanism with the drive axle.

[0010] In a possible design, the system further includes a fifth transmission mechanism, and the first reduction mechanism is a planetary reducer; wherein

[0011] The fifth transmission mechanism is engaged with the first gear of the second shift mechanism, the fifth transmission mechanism is connected to the intermediate shaft of the planetary carrier of the first reduction mechanism, and the sun gear intermediate shaft of the first reduction mechanism is coaxially fixedly connected to the first motor.

[0012] In a possible design, the system further includes a second transmission mechanism, wherein the second reduction mechanism is a planetary reducer, wherein:

[0013] The other end of the clutch is connected to the second reduction mechanism through the second transmission mechanism, the output shaft of the second reduction mechanism is connected to the second transmission mechanism, and the input shaft of the second reduction mechanism is connected to the second motor shaft.

[0014] In a possible design, the system further includes a first transmission mechanism, and an end of the first shift mechanism away from the clutch is connected to the first reduction mechanism through an output shaft of the first transmission mechanism, and the first reduction mechanism is a planetary reducer.

[0015] In a possible design, the system further includes a transmission mechanism, and the first shift mechanism or the second shift mechanism is further connected to the drive axle via the transmission mechanism.

[0016] In a possible design, the speed change mechanism is a two-speed gearbox, the speed change mechanism includes a fifth gear shift mechanism and a third transmission mechanism; the fifth gear shift mechanism includes a first gear, a second gear and an intermediate gear, the first gear of the fifth gear shift mechanism can be meshed and linked with the intermediate gear of the fifth gear shift mechanism through a gear set, the second gear of the fifth gear shift mechanism can be meshed and linked with the intermediate gear of the fifth gear shift mechanism through a gear set; the first gear of the fifth gear shift mechanism and the second gear of the fifth gear shift mechanism can also be linked through the third transmission mechanism;

[0017] The first gear position of the fifth gear shift mechanism is linked to the first gear shift mechanism or the second gear shift mechanism, and the middle gear position of the fifth gear shift mechanism is connected to the driving shaft of the driving axle.

[0018] In a possible design, the speed change mechanism is a four-speed gearbox, and the speed change mechanism includes a sixth gear change mechanism, a seventh gear change mechanism and a fourth transmission mechanism; the sixth gear change mechanism includes a first gear, a second gear and an intermediate gear, and the first gear of the sixth gear change mechanism can be meshed and linked with the intermediate gear of the sixth gear change mechanism through a gear set, and the second gear of the sixth gear change mechanism can be meshed and linked with the intermediate gear of the sixth gear change mechanism through a gear set;

[0019] The seventh gear shift mechanism comprises a first gear, a second gear and an intermediate gear, the intermediate gear of the seventh gear shift mechanism can be meshed and linked with the first gear of the seventh gear shift mechanism through a gear set, and the intermediate gear of the seventh gear shift mechanism can be meshed and linked with the second gear of the seventh gear shift mechanism through a gear set;

[0020] The first gear position of the sixth gear shift mechanism can be linked with the first gear shift mechanism or the second gear shift mechanism, and the intermediate gear position of the sixth gear shift mechanism can be linked with the drive shaft through the intermediate gear position of the seventh gear shift mechanism;

[0021] The first gear of the sixth gear shift mechanism, the second gear of the sixth gear shift mechanism, the first gear of the seventh gear shift mechanism and the second gear of the seventh gear shift mechanism can also be linked according to the fourth transmission mechanism;

[0022] In a possible design, the drive axle is a single drive axle or a double mechanical drive axle.

[0023] In a second aspect, the present application provides a vehicle comprising the above-mentioned plug-in hybrid power system.

[0024] The present application provides a plug-in hybrid system and vehicle, including an engine, a clutch, a first motor, a first reduction mechanism, a second motor, a second reduction mechanism, a first shift mechanism and a drive axle, wherein the output shaft of the engine is connected to one end of the clutch, and the other end of the clutch is connected to the second motor through the second reduction mechanism; the other end of the clutch is also connected to the drive axle through the first shift mechanism, and the first shift mechanism is used to connect or disconnect the clutch and the drive axle; the drive axle is also connected to the first motor through the first reduction mechanism. The following technical effects are achieved: the present application has a compact structure and can be applied to a variety of working conditions and a variety of vehicle models to meet the user's demand for commercial vehicles; it can reduce no-load losses, while ensuring the power of the system, and taking into account fuel economy, and improving fuel saving rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A schematic diagram of a plug-in hybrid system provided in an embodiment of the present application Figure 1 ;

[0027] Figure 2 A schematic diagram of a plug-in hybrid system provided in an embodiment of the present application Figure 2 ;

[0028] Figure 3 A schematic diagram of a plug-in hybrid system provided in an embodiment of the present application Figure 3 ;

[0029] Figure 4 A schematic diagram of a plug-in hybrid system provided in an embodiment of the present application Figure 4 .

[0030] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments.

[0031] Description of reference numerals:

[0032] 101-engine; 102-clutch; 103-first shift mechanism; 104-second transmission mechanism; 105-second reduction mechanism; 106-second motor; 107-drive shaft; 108-first transmission mechanism; 109-first reduction mechanism; 110-first motor; 111-drive axle;

[0033] 201- second shift mechanism; 202- fifth transmission mechanism;

[0034] 300-two-speed gearbox; 301-fifth gear shift mechanism; 302-third transmission mechanism;

[0035] 400 - fourth gear gearbox; 401 - sixth gear shift mechanism; 402 - seventh gear shift mechanism; 403 - fourth transmission mechanism. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] In the description of the present application, it should be understood that the terms used include "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. to indicate orientation or positional relationships. They are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the equipment or method of the present application. They are not used to indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0039] In the specification and claims of the present application and the above-mentioned drawings, the terms "first", "second", and "third" are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the objects used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example.

[0040] In addition, the described terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusions; for example, a process, method, system, product, or maintenance tool that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but also includes other steps or units not explicitly listed or inherent to these processes, methods, products, or maintenance tools.

[0041] In the existing technology, the operating conditions of commercial vehicles are relatively complex. Under complex operating conditions, the hybrid powertrain system can play a higher advantage and significantly improve the fuel saving rate. In addition, hybrid vehicles do not have the anxiety of driving range. The power density of the entire powertrain system is high, so it will not affect the load. A single series hybrid system or parallel system has poor road adaptability and low fuel saving rate.

[0042] The present application provides a plug-in hybrid system and a vehicle thereof, aiming to solve the above technical problems of the prior art.

[0043] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0044] Figure 1 A schematic diagram of a plug-in hybrid system provided in an embodiment of the present application Figure 1 ;like Figure 1 As shown, the system provided in this embodiment includes an engine 101, a clutch 102, a first motor 110, a first reduction mechanism 109, a second motor 106, a second reduction mechanism 105, a first shift mechanism 103 and a drive axle 111; wherein

[0045] The output shaft of the engine 101 is connected to one end of the clutch 102, and the other end of the clutch 102 is connected to the second motor 106 through the second reduction mechanism 105; the other end of the clutch 102 is also connected to the drive axle 111 through the first shifting mechanism 103, and the first shifting mechanism 103 is used to realize or disconnect the connection between the clutch 102 and the drive axle 111; the drive axle 111 is also connected to the first motor 110 through the first reduction mechanism 109.

[0046] Specifically, the first gear shifting mechanism 103 includes a first gear and a second gear. The first gear and the second gear of the first gear shifting mechanism 103 can be engaged or disconnected through gears. The end of the first gear shifting mechanism 103 connected to the first gear is the input end, and the end connected to the second gear is the output end. The input end of the first gear shifting mechanism 103 is coaxially connected to the clutch 102, and the output end of the first gear shifting mechanism 103 is coaxially connected to the output shaft of the drive axle 111.

[0047] The system provided in the embodiment of the present application includes an engine 101, a clutch 102, a first motor 110, a first reduction mechanism 109, a second motor 106, a second reduction mechanism 105, a first shift mechanism 103 and a drive axle 111. The output shaft of the engine 101 is connected to one end of the clutch 102, and the other end of the clutch 102 is connected to the second motor 106 through the second reduction mechanism 105; the other end of the clutch 102 is also connected to the drive axle 111 through the first shift mechanism 103, and the first shift mechanism 103 is used to connect or disconnect the clutch 102 and the drive axle 111; the drive axle 111 is also connected to the first motor 110 through the first reduction mechanism 109. The following technical effects can be achieved:

[0048] The embodiment of the present application can realize a pure electric mode driven by a single motor: this is achieved by disconnecting the clutch 102 and the first shift mechanism 103, and the first motor 110 is working, and the torque is amplified by the first reduction mechanism 109 and then transmitted to the drive shaft 107 of the drive axle 111 for driving the vehicle wheels, thereby realizing a pure electric mode driven by a single motor.

[0049] The embodiment of the present application can realize a pure electric mode of dual-motor drive: the clutch 102 is disconnected and the first shift mechanism 103 is engaged, so that the first motor 110 and the second motor 106 can work simultaneously, and the first motor 110 amplifies the torque through the first reduction mechanism 109 and transmits it to the drive shaft 107 of the drive axle 111; the second motor 106 amplifies the torque through the second reduction mechanism 105 and the first shift mechanism 103 and transmits it to the drive shaft 107 of the drive axle 111; the drive shaft 107 is used to drive the vehicle wheels, thereby realizing a pure electric mode of dual-motor drive.

[0050] The embodiment of the present application can realize the series mode: it is realized by engaging the clutch 102 and disconnecting the first shift mechanism 103. On the one hand, the engine 101 is working, and the battery is charged through the clutch 102, the second reduction mechanism 105 and the second motor 106 in sequence. On the other hand, the first motor 110 amplifies the torque through the first reduction mechanism 109 and transmits it to the drive shaft 107 of the drive axle 111 for driving the vehicle wheels. In the series mode, the battery charging and the vehicle driving can be realized at the same time.

[0051] The embodiment of the present application can realize the parallel mode of dual-motor hybrid: when the clutch 102 is engaged and the first shift mechanism 103 is engaged, on the one hand, the engine 101 is working, and the wheel transmission is carried out through the clutch 102, the first shift mechanism 103, and the drive shaft 107 in sequence; on the other hand, the first motor 110 is working, and the wheel transmission is realized through the first reduction mechanism 109 to the drive axle 111; on the third hand, the second motor 106 amplifies the torque through the second reduction mechanism 105 and the first shift mechanism 103 and transmits it to the drive shaft 107 of the drive axle 111; this parallel mode can realize that three power sources provide power at the same time. When multiple power sources are driven, the drive shaft 107 receives power as a torque merging unit.

[0052] In summary, the embodiment of the present invention can provide a plug-in hybrid system, which can realize the pure electric mode of single motor drive, the pure electric mode of dual motor drive, the series model of parallel power generation and driving, and the parallel mode of dual motor hybrid according to the cooperation between the clutch 102 and the first shift mechanism 103. The system provided by this embodiment has a compact structure and can be applied to a variety of working conditions and a variety of vehicle models to meet the user's demand for commercial vehicles; it can reduce no-load losses, while ensuring the power of the system, and taking into account fuel economy, thereby improving the fuel saving rate.

[0053] Figure 2 A schematic diagram of a plug-in hybrid system provided in an embodiment of the present application Figure 2 ;like Figure 2 As shown, the system includes an engine 101, a clutch 102, a first motor 110, a first reduction mechanism 109, a second motor 106, a second reduction mechanism 105, a first gear shifting mechanism 103, a second gear shifting mechanism 201 and a drive axle 111; the output shaft of the engine 101 is connected to one end of the clutch 102, and the other end of the clutch 102 is connected to the second motor 106 through the second reduction mechanism 105; the other end of the clutch 102 is also connected to the drive axle 111 through the first gear shifting mechanism 103 and the second gear shifting mechanism 201 in sequence, and the drive axle 111 is also connected to the first reduction mechanism 109 and the first motor 110 in sequence through the second gear shifting mechanism 201; the first gear shifting mechanism 103 is used to disconnect or realize the connection between the clutch 102 and the second gear shifting mechanism 201, and the second gear shifting mechanism 201 is used to disconnect or realize the connection between the first reduction mechanism 109 and the drive axle 111.

[0054] Specifically, the first gear shifting mechanism 103 includes a first gear and a second gear, wherein the first gear and the second gear can be engaged or disconnected through gears, the end of the first gear shifting mechanism 103 connected to the first gear is the input end, and the end connected to the second gear is the output end; the input end of the first gear shifting mechanism 103 is coaxially connected to the clutch 102, and the output end of the first gear shifting mechanism 103 is coaxially connected to the input end of the second gear shifting mechanism 201.

[0055] Specifically, the second gear shifting mechanism 201 includes a first gear and a second gear, and the first gear and the second gear can be engaged or disconnected through gears. The output end of the second gear shifting mechanism 201 is coaxially connected to the drive shaft 107 of the drive axle 111 through the second gear of the second gear shifting mechanism 201, and the first gear of the second gear shifting mechanism 201 is connected to the first motor 110 through the first reduction mechanism 109.

[0056] The system provided by the embodiment of the present application includes an engine 101, a clutch 102, a first motor 110, a first reduction mechanism 109, a second motor 106, a second reduction mechanism 105, a first gear shifting mechanism 103, a second gear shifting mechanism 201 and a drive axle 111; the output shaft of the engine 101 is connected to one end of the clutch 102, and the other end of the clutch 102 is connected to the drive axle 111 through the second reduction mechanism 105 and the second motor 106; the other end of the clutch 102 is also connected to the drive axle 111 through the first gear shifting mechanism 103 and the second gear shifting mechanism 201 in sequence, and the drive axle 111 is also connected to the first reduction mechanism 109 and the first motor 110 in sequence through the second gear shifting mechanism 201; the first gear shifting mechanism 103 is used to disconnect or realize the connection between the clutch 102 and the second gear shifting mechanism 201, and the second gear shifting mechanism 201 is used to disconnect or realize the connection between the first reduction mechanism 109 and the drive axle 111. The following technical effects can be achieved:

[0057] The embodiment of the present application can realize a pure electric mode driven by a single motor: this is achieved by disconnecting the clutch 102, disconnecting the first gear shifting mechanism 103 and engaging the second gear shifting mechanism 201, the first motor 110 works, and after the torque is amplified by the first reduction mechanism 109, it is transmitted to the drive shaft 107 of the drive axle 111 through the second gear shifting mechanism 201, and is used to drive the vehicle wheels, thereby realizing a pure electric mode driven by a single motor.

[0058] The embodiment of the present application can realize a pure electric mode of dual-motor drive: the clutch 102 is disconnected and the first gear shift mechanism 103 is engaged and the second gear shift mechanism 201 is engaged, so that the first motor 110 and the second motor 106 can work simultaneously, and the first motor 110 amplifies the torque through the first reduction mechanism 109 and transmits it to the drive shaft 107 of the drive axle 111 through the second gear shift mechanism 201; the second motor 106 amplifies the torque through the second reduction mechanism 105 and transmits it to the drive shaft 107 of the drive axle 111 through the first gear shift mechanism 103 and the second gear shift mechanism 201; the drive shaft 107 is used to drive the vehicle wheels, thereby realizing a pure electric mode of dual-motor drive.

[0059] The embodiment of the present application can realize the series mode: it is realized by engaging the clutch 102, disconnecting the first shift mechanism 103 and engaging the second shift mechanism 201. On the one hand, the engine 101 is working, and the battery is charged through the clutch 102, the second reduction mechanism 105 and the second motor 106 in sequence. On the other hand, the first motor 110 amplifies the torque through the first reduction mechanism 109 and transmits it to the drive shaft 107 of the drive axle 111 through the second shift mechanism 201 for driving the vehicle wheels. In the series mode, the battery charging and the vehicle driving can be realized at the same time.

[0060] The embodiment of the present application can realize the first parallel mode of single-motor hybrid: it is realized by engaging the clutch 102, engaging the first shift mechanism 103 and disconnecting the second shift mechanism 201. On the one hand, the engine 101 works, and provides power to the drive axle 111 through the clutch 102, the first shift mechanism 103 and the second shift mechanism 201 in sequence. On the other hand, the second motor 106 amplifies the torque through the second reduction mechanism 105, and transmits the power to the drive shaft 107 of the drive axle 111 through the first shift mechanism 103 and the second shift mechanism 201. Thus, the second motor 106 and the engine 101 dual power sources work simultaneously.

[0061] The embodiment of the present application can realize the second parallel mode of dual-motor hybrid: when the clutch 102 is engaged, the first shift mechanism 103 is engaged and the second shift mechanism 201 is engaged, on the one hand, the engine 101 is working, and the wheel transmission is carried out through the clutch 102, the first shift mechanism 103 and the drive shaft 107 in sequence; on the other hand, the first motor 110 is working, and the wheel transmission is realized through the first reduction mechanism 109 to the drive axle 111; on the third hand, the second motor 106 amplifies the torque through the second reduction mechanism 105 and the first shift mechanism 103 and transmits it to the drive shaft 107 of the drive axle 111; this parallel mode can realize that three power sources provide power at the same time. When multiple power sources are driven, the drive shaft 107 receives power as a torque merging unit.

[0062] In summary, the embodiment of the present invention can provide a plug-in hybrid system, which can realize the pure electric mode of single motor drive, the pure electric mode of dual motor drive, the series model of parallel power generation and driving, the first parallel mode of single motor hybrid, and the second parallel mode of dual motor hybrid according to the cooperation of the clutch 102 with the first shift mechanism 103 and the second shift mechanism 201. The system provided by this embodiment has a compact structure and can be applied to a variety of working conditions and a variety of vehicle models to meet the user's demand for commercial vehicles; it can reduce no-load losses, while ensuring the power of the system, and taking into account fuel economy, thereby improving the fuel saving rate.

[0063] Figure 3 A schematic diagram of a plug-in hybrid system provided in an embodiment of the present application Figure 3 ;like Figure 3 As shown, the system includes an engine 101, a clutch 102, a first motor 110, a first reduction mechanism 109, a second motor 106, a second reduction mechanism 105, a first shift mechanism 103 and a drive axle 111; wherein

[0064] The output shaft of the engine 101 is connected to one end of the clutch 102, and the other end of the clutch 102 is connected to the second motor 106 through the second reduction mechanism 105; the other end of the clutch 102 is also connected to the drive axle 111 through the first shifting mechanism 103, and the first shifting mechanism 103 is used to realize or disconnect the connection between the clutch 102 and the drive axle 111; the drive axle 111 is also connected to the first motor 110 through the first reduction mechanism 109.

[0065] Specifically, the first gear shifting mechanism 103 includes a first gear and a second gear. The first gear and the second gear of the first gear shifting mechanism 103 can be engaged or disconnected through gears. The end of the first gear shifting mechanism 103 connected to the first gear is the input end, and the end connected to the second gear is the output end. The input end of the first gear shifting mechanism 103 is coaxially connected to the clutch 102, and the output end of the first gear shifting mechanism 103 is coaxially connected to the output shaft of the drive axle 111.

[0066] Furthermore, the system also includes a second transmission mechanism 104, and the second reduction mechanism 105 is a planetary reducer; the other end of the clutch 102 is connected to the second reduction mechanism 105 through the second transmission mechanism 104, the output shaft of the second reduction mechanism 105 is connected to the second transmission mechanism 104, and the input shaft of the second reduction mechanism 105 is connected to the shaft of the second motor 106.

[0067] Specifically, the second transmission mechanism 104 includes a first gear and a second gear that are meshed with each other; the first gear is coaxially connected to the other end of the clutch 102 or the input end of the first shift mechanism 103, the second gear is coaxially connected to one end of the planetary carrier of the second reduction mechanism 105, and one end of the sun gear of the second reduction mechanism 105 is coaxially fixed to the second motor 106.

[0068] Furthermore, the system also includes a first transmission mechanism 108 , and one end of the first shift mechanism 103 away from the clutch 102 is connected to a first reduction mechanism 109 through the first transmission mechanism 108 , and the first reduction mechanism 109 is a planetary reducer.

[0069] Specifically, the first transmission mechanism 108 includes a third gear and a fourth gear that are meshed with each other; the third gear is coaxially connected to the output end of the first shifting mechanism 103, the fourth gear is coaxially connected to one end of the planetary carrier of the first reduction mechanism 109, and one end of the sun gear in the first reduction mechanism 109 is coaxially connected to the first motor 110.

[0070] Specifically, the first reduction mechanism 109 is used to increase the torque of the first motor 110 , and the second reduction mechanism 105 is used to increase the torque of the second motor 106 .

[0071] Furthermore, the system also includes a speed change mechanism, and the first shift mechanism 103 is connected to the drive axle 111 via the speed change mechanism.

[0072] Specifically, the input end of the speed change mechanism is coaxially connected to the output end of the first shift mechanism 103, and the output end of the speed change mechanism is coaxially connected to the drive axle 111;

[0073] As an embodiment, the speed change mechanism is a double intermediate shaft gearbox.

[0074] Optionally, the speed change mechanism may be a two-speed gearbox 300 or a four-speed gearbox 400. The four-speed gearbox 400 can be applied to 4×2 and 6×4 medium and heavy trucks.

[0075] like Figure 3 The two-speed gearbox 300 includes a fifth gear shifting mechanism 301 and a third transmission mechanism 302; the fifth gear shifting mechanism 301 includes a first gear, a second gear and an intermediate gear; the first gear of the fifth gear shifting mechanism 301 can be meshed and linked with the intermediate gear of the fifth gear shifting mechanism 301 through a gear set; the second gear of the fifth gear shifting mechanism 301 can be meshed and linked with the intermediate gear of the fifth gear shifting mechanism 301 through a gear set; the first gear of the fifth gear shifting mechanism 301 and the second gear of the fifth gear shifting mechanism 301 can also be linked through the third transmission mechanism 302.

[0076] Furthermore, the third transmission mechanism 302 is a coaxial gear set, which adjusts the torque through transmission of different gears and the tooth ratio between meshing gears.

[0077] Furthermore, the first gear position of the fifth gear shift mechanism 301 can be connected to the first gear shift mechanism 103 in linkage, and the middle gear position of the fifth gear shift mechanism 301 is connected to the drive shaft 107 of the drive axle 111 .

[0078] Specifically, the first gear of the two-speed gearbox 300 is the second gear that fits the middle gear, that is, the first shift mechanism 103 is directly connected to the drive shaft 107 through the first gear of the fifth shift mechanism 301, the third transmission mechanism 302, the second gear, and the middle gear in sequence, which is a low gear.

[0079] Specifically, the second gear of the two-speed gearbox 300 is the first gear and the middle gear are aligned, that is, the first shift mechanism 103 is linked with the drive shaft 107 through the first gear and the middle gear of the fifth shift mechanism 301 in sequence, which is a high gear.

[0080] Furthermore, the first motor 110 and the second motor 106 are both connected to a battery.

[0081] As an embodiment, the first motor 110 and the second motor 106 are high-speed motors.

[0082] As an embodiment, the first shifting mechanism 103 is a fork shifting mechanism.

[0083] As an embodiment, the speed change mechanism is connected to the drive shaft 107 via a universal joint.

[0084] Optionally, the output shaft of the first motor 110 , the output shaft of the second motor 106 and the drive shaft 107 are arranged in parallel.

[0085] Optionally, the drive axle 111 is a single drive axle 111 or a dual mechanical drive axle 111, so that the present embodiment can be applicable to different vehicle models.

[0086] The system provided in the embodiment of the present application can achieve the following technical effects:

[0087] The embodiment of the present application can realize a pure electric mode driven by a single motor: this is achieved by disconnecting the clutch 102 and the first shift mechanism 103, and the first motor 110 is working, and the torque is amplified by the first reduction mechanism 109 and then transmitted to the drive shaft 107 of the drive axle 111 for driving the vehicle wheels, thereby realizing a pure electric mode driven by a single motor.

[0088] The embodiment of the present application can realize a pure electric mode of dual-motor drive: the clutch 102 is disconnected and the first shift mechanism 103 is engaged, so that the first motor 110 and the second motor 106 can work simultaneously, and the first motor 110 amplifies the torque through the first reduction mechanism 109 and transmits it to the drive shaft 107 of the drive axle 111; the second motor 106 amplifies the torque through the second reduction mechanism 105 and the first shift mechanism 103 and transmits it to the drive shaft 107 of the drive axle 111; the drive shaft 107 is used to drive the vehicle wheels, thereby realizing a pure electric mode of dual-motor drive.

[0089] The embodiment of the present application can realize the series mode: it is realized by engaging the clutch 102 and disconnecting the first shift mechanism 103. On the one hand, the engine 101 is working, and the battery is charged through the clutch 102, the second reduction mechanism 105 and the second motor 106 in sequence. On the other hand, the first motor 110 amplifies the torque through the first reduction mechanism 109 and transmits it to the drive shaft 107 of the drive axle 111 for driving the vehicle wheels. In the series mode, the battery charging and the vehicle driving can be realized at the same time.

[0090] The embodiment of the present application can realize the parallel mode of dual-motor hybrid: when the clutch 102 is engaged and the first shift mechanism 103 is engaged, on the one hand, the engine 101 is working, and the wheel transmission is carried out through the clutch 102, the first shift mechanism 103, and the drive shaft 107 in sequence; on the other hand, the first motor 110 is working, and the wheel transmission is realized through the first reduction mechanism 109 to the drive axle 111; on the third hand, the second motor 106 amplifies the torque through the second reduction mechanism 105 and the first shift mechanism 103 and transmits it to the drive shaft 107 of the drive axle 111; this parallel mode can realize that three power sources provide power at the same time. When multiple power sources are driven, the drive shaft 107 receives power as a torque merging unit.

[0091] The embodiment of the present application can achieve speed shifting under different power source modes through the speed shifting mechanism. The speed shifting function is not affected by the power source mode, and speed shifting and forward movement can be achieved under the above different power source modes.

[0092] In summary, the embodiment of the present invention can provide a plug-in hybrid system, which can realize the pure electric mode of single motor drive, the pure electric mode of dual motor drive, the series model of parallel power generation and driving, and the parallel mode of dual motor hybrid according to the cooperation between the clutch 102 and the first shift mechanism 103, and can realize variable speed driving in the above modes. The system provided by this embodiment has a compact structure and can be applied to a variety of working conditions and a variety of vehicle models, including light commercial vehicles, 4×2 models, 6×4 medium and heavy trucks, etc., which can meet the user's demand for commercial vehicles; it can reduce no-load losses, while ensuring the power of the system, and taking into account fuel economy, and improving fuel saving rate.

[0093] Figure 4 A schematic diagram of a plug-in hybrid system provided in an embodiment of the present application Figure 4 ;like Figure 4 As shown, the system includes an engine 101, a clutch 102, a first motor 110, a first reduction mechanism 109, a second motor 106, a second reduction mechanism 105, a first gear shifting mechanism 103, a second gear shifting mechanism 201 and a drive axle 111; the output shaft of the engine 101 is connected to one end of the clutch 102, and the other end of the clutch 102 is connected to the second motor 106 through the second reduction mechanism 105; the other end of the clutch 102 is also connected to the drive axle 111 through the first gear shifting mechanism 103 and the second gear shifting mechanism 201 in sequence, and the drive axle 111 is also connected to the first reduction mechanism 109 and the first motor 110 in sequence through the second gear shifting mechanism 201; the first gear shifting mechanism 103 is used to disconnect or realize the connection between the clutch 102 and the second gear shifting mechanism 201, and the second gear shifting mechanism 201 is used to disconnect or realize the connection between the first reduction mechanism 109 and the drive axle 111.

[0094] Specifically, the first gear shifting mechanism 103 includes a first gear and a second gear, wherein the first gear and the second gear can be engaged or disconnected through gears, the end of the first gear shifting mechanism 103 connected to the first gear is the input end, and the end connected to the second gear is the output end; the input end of the first gear shifting mechanism 103 is coaxially connected to the clutch 102, and the output end of the first gear shifting mechanism 103 is coaxially connected to the input end of the second gear shifting mechanism 201.

[0095] Specifically, the second gear shifting mechanism 201 includes a first gear and a second gear, and the first gear and the second gear can be engaged or disconnected through gears. The output end of the second gear shifting mechanism 201 is coaxially connected to the drive shaft 107 of the drive axle 111 through the second gear of the second gear shifting mechanism 201, and the first gear of the second gear shifting mechanism 201 is connected to the first motor 110 through the first reduction mechanism 109.

[0096] Furthermore, the first gear of the second shift mechanism 201 is also connected to the first reduction mechanism 109 through the fifth transmission mechanism 202 , the fifth transmission mechanism 202 is engaged with the first gear of the second shift mechanism 201 , and the fifth transmission mechanism 202 is coaxially connected to the output shaft of the first reduction mechanism 109 .

[0097] Furthermore, the first reduction mechanism 109 is a planetary reducer, the fifth transmission mechanism 202 is coaxially connected to one end of the planetary carrier of the first reduction mechanism 109 , and the input shaft of the first reduction mechanism 109 is connected to the shaft of the first motor 110 .

[0098] Furthermore, the system also includes a second transmission mechanism 104, and the second reduction mechanism 105 is a planetary reducer; the other end of the clutch 102 is connected to the second reduction mechanism 105 through the second transmission mechanism 104, the output shaft of the second reduction mechanism 105 is connected to the second transmission mechanism 104, and the input shaft of the second reduction mechanism 105 is connected to the shaft of the second motor 106.

[0099] Specifically, the second transmission mechanism 104 includes a first gear and a second gear that are meshed with each other; the first gear is coaxially connected to the other end of the clutch 102 or the input end of the first shift mechanism 103, the second gear is coaxially connected to one end of the planetary carrier of the second reduction mechanism 105, and one end of the sun gear of the second reduction mechanism 105 is coaxially fixed to the second motor 106.

[0100] Specifically, the first reduction mechanism 109 is used to increase the torque of the first motor 110 , and the second reduction mechanism 105 is used to increase the torque of the second motor 106 .

[0101] Furthermore, the system also includes a speed change mechanism, and the first shift mechanism 103 is connected to the drive axle 111 via the speed change mechanism.

[0102] Specifically, the input end of the speed change mechanism is coaxially connected to the output end of the first shift mechanism 103, and the output end of the speed change mechanism is coaxially connected to the drive axle 111;

[0103] As an embodiment, the speed change mechanism is a double intermediate shaft gearbox.

[0104] Optionally, the speed change mechanism may be a two-speed gearbox 300 or a four-speed gearbox 400. The four-speed gearbox 400 can be applied to 4×2 and 6×4 medium and heavy trucks.

[0105] like Figure 4 The two-speed gearbox 300 is a four-speed gearbox 400 including a sixth gearshift mechanism 401, a seventh gearshift mechanism 402 and a fourth transmission mechanism 403; the sixth gearshift mechanism 401 includes a first gear, a second gear and an intermediate gear, the first gear of the sixth gearshift mechanism 401 can be meshed and linked with the intermediate gear of the sixth gearshift mechanism 401 through a gear set, and the second gear of the sixth gearshift mechanism 401 can be meshed and linked with the intermediate gear of the sixth gearshift mechanism 401 through a gear set;

[0106] The seventh gear shift mechanism 402 includes a first gear, a second gear and an intermediate gear. The intermediate gear of the seventh gear shift mechanism 402 can be meshed and linked with the first gear of the seventh gear shift mechanism 402 through a gear set, and the intermediate gear of the seventh gear shift mechanism 402 can be meshed and linked with the second gear of the seventh gear shift mechanism 402 through a gear set.

[0107] The first gear position of the sixth gear shift mechanism 401 can be linked with the second gear shift mechanism 201, and the middle gear position of the sixth gear shift mechanism 401 can be linked with the drive shaft 107 through the middle gear position of the seventh gear shift mechanism 402;

[0108] The first gear position of the sixth gear shift mechanism 401, the second gear position of the sixth gear shift mechanism 401, the first gear position of the seventh gear shift mechanism 402, and the second gear position of the seventh gear shift mechanism 402 can also be linked according to the fourth transmission mechanism 403;

[0109] Furthermore, the fourth transmission mechanism 403 is a coaxial gear set, which adjusts the torque through transmission of different gears and the tooth ratio between meshing gears.

[0110] Specifically, the four-speed gearbox 400 achieves speed change in the following manner:

[0111] First gear: the sixth gear shift mechanism 401 is placed in the middle gear position (i.e., not engaged with the first gear position or the second gear position), and the second gear position in the seventh gear shift mechanism 402 is engaged with the middle gear position, then the output shaft of the second gear shift mechanism 201 drives the drive axle 111 in sequence through the first gear position of the sixth gear shift mechanism 401, the fourth transmission mechanism 403, the second gear position of the seventh gear shift mechanism 402, and the middle gear position.

[0112] Second gear: the sixth gear shift mechanism 401 is placed in the middle gear position (i.e. not engaged with the first gear position or the second gear position), and the first gear position in the seventh gear shift mechanism 402 is engaged with the middle gear position, then the output shaft of the second gear shift mechanism 201 drives the drive axle 111 in sequence through the first gear position of the sixth gear shift mechanism 401, the fourth transmission mechanism 403, the first gear position of the seventh gear shift mechanism 402, and the middle gear position.

[0113] Third gear: The second gear position of the sixth gear shift mechanism 401 is aligned with the middle gear position, and the seventh gear shift mechanism 402 is placed in the middle gear position. Then the output shaft of the second gear shift mechanism 201 drives the drive axle 111 through the first gear position of the sixth gear shift mechanism 401, the fourth transmission mechanism 403, the second gear position, the middle gear position, and the middle gear position of the seventh gear shift mechanism 402.

[0114] Fourth gear: the first gear position and the middle gear position of the sixth gear shift mechanism 401 match each other, and the seventh gear shift mechanism 402 is placed in the middle gear position. Then the output shaft of the second gear shift mechanism 201 drives the drive axle 111 through the first gear position, the middle gear position of the sixth gear shift mechanism 401 and the middle gear position of the seventh gear shift mechanism 402.

[0115] It should be noted that, among the above four gears, the higher the gear, the higher the speed.

[0116] Furthermore, the first motor 110 and the second motor 106 are both connected to a battery.

[0117] As an embodiment, the first motor 110 and the second motor 106 are high-speed motors.

[0118] As an embodiment, the first shifting mechanism 103 is a fork shifting mechanism.

[0119] As an embodiment, the speed change mechanism is connected to the drive shaft 107 via a universal joint.

[0120] Optionally, the output shaft of the first motor 110 , the output shaft of the second motor 106 and the drive shaft 107 are arranged in parallel.

[0121] Optionally, the drive axle 111 is a single drive axle 111 or a dual mechanical drive axle 111, so that the present embodiment can be applicable to different vehicle models.

[0122] The system provided in the embodiment of the present application can achieve the following technical effects:

[0123] The embodiment of the present application can realize a pure electric mode driven by a single motor: this is achieved by disconnecting the clutch 102, disconnecting the first gear shifting mechanism 103 and engaging the second gear shifting mechanism 201, the first motor 110 works, and after the torque is amplified by the first reduction mechanism 109, it is transmitted to the drive shaft 107 of the drive axle 111 through the second gear shifting mechanism 201, and is used to drive the vehicle wheels, thereby realizing a pure electric mode driven by a single motor.

[0124] The embodiment of the present application can realize a pure electric mode of dual-motor drive: the clutch 102 is disconnected and the first gear shift mechanism 103 is engaged and the second gear shift mechanism 201 is engaged, so that the first motor 110 and the second motor 106 can work simultaneously, and the first motor 110 amplifies the torque through the first reduction mechanism 109 and transmits it to the drive shaft 107 of the drive axle 111 through the second gear shift mechanism 201; the second motor 106 amplifies the torque through the second reduction mechanism 105 and transmits it to the drive shaft 107 of the drive axle 111 through the first gear shift mechanism 103 and the second gear shift mechanism 201; the drive shaft 107 is used to drive the vehicle wheels, thereby realizing a pure electric mode of dual-motor drive.

[0125] The embodiment of the present application can realize the series mode: it is realized by engaging the clutch 102, disconnecting the first shift mechanism 103 and engaging the second shift mechanism 201. On the one hand, the engine 101 is working, and the battery is charged through the clutch 102, the second reduction mechanism 105 and the second motor 106 in sequence. On the other hand, the first motor 110 amplifies the torque through the first reduction mechanism 109 and transmits it to the drive shaft 107 of the drive axle 111 through the second shift mechanism 201 for driving the vehicle wheels. In the series mode, the battery charging and the vehicle driving can be realized at the same time.

[0126] The embodiment of the present application can realize the first parallel mode of single-motor hybrid: it is realized by engaging the clutch 102, engaging the first shift mechanism 103 and disconnecting the second shift mechanism 201. On the one hand, the engine 101 works, and provides power to the drive axle 111 through the clutch 102, the first shift mechanism 103 and the second shift mechanism 201 in sequence. On the other hand, the second motor 106 amplifies the torque through the second reduction mechanism 105, and transmits the power to the drive shaft 107 of the drive axle 111 through the first shift mechanism 103 and the second shift mechanism 201. Thus, the second motor 106 and the engine 101 dual power sources work simultaneously.

[0127] The embodiment of the present application can realize the second parallel mode of dual-motor hybrid: when the clutch 102 is engaged, the first shift mechanism 103 is engaged and the second shift mechanism 201 is engaged, on the one hand, the engine 101 is working, and the wheel transmission is carried out through the clutch 102, the first shift mechanism 103 and the drive shaft 107 in sequence; on the other hand, the first motor 110 is working, and the wheel transmission is realized through the first reduction mechanism 109 to the drive axle 111; on the third hand, the second motor 106 amplifies the torque through the second reduction mechanism 105 and the first shift mechanism 103 and transmits it to the drive shaft 107 of the drive axle 111; this parallel mode can realize that three power sources provide power at the same time. When multiple power sources are driven, the drive shaft 107 receives power as a torque merging unit.

[0128] The embodiment of the present application can achieve speed shifting under different power source modes through the speed shifting mechanism. The speed shifting function is not affected by the power source mode, and speed shifting and forward movement can be achieved under the above different power source modes.

[0129] In summary, the embodiment of the present invention can provide a plug-in hybrid power system, which can realize the pure electric mode of single motor drive, the pure electric mode of dual motor drive, the series model of parallel power generation and driving, the first parallel mode of single motor hybrid, and the second parallel mode of dual motor hybrid according to the cooperation of the clutch 102 with the first shift mechanism 103 and the second shift mechanism 201, and can realize variable speed driving in the above modes. The system provided by this embodiment has a compact structure and can be applied to a variety of working conditions and a variety of vehicle models, including light commercial vehicles, 4×2 models, 6×4 medium and heavy trucks, etc., which can meet the user's demand for commercial vehicles; it can reduce no-load loss, while ensuring the power of the system, and taking into account fuel economy, and improving the fuel saving rate.

[0130] An embodiment of the present application further provides a vehicle, including the above-mentioned plug-in hybrid system, whose implementation principle and technical effect are similar to those of the above-mentioned system and will not be repeated here.

[0131] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0132] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A plug-in hybrid system, characterized in that: It includes an engine, a clutch, a first motor, a first reduction mechanism, a second motor, a second reduction mechanism, a first shift mechanism and a drive axle; wherein: The output shaft of the engine is connected to one end of the clutch, and the other end of the clutch is connected to the second motor through the second speed reduction mechanism; the other end of the clutch is also connected to the drive axle through the first shifting mechanism, and the first shifting mechanism is used to realize or disconnect the connection between the clutch and the drive axle; the drive axle is also connected to the first motor through the first speed reduction mechanism; The first shift mechanism is also connected to the drive axle through a second shift mechanism; the drive axle is also connected to the first reduction mechanism through the second shift mechanism; The first shift mechanism is used to disconnect or realize the connection between the clutch and the second shift mechanism, and the second shift mechanism is used to disconnect or realize the connection between the first reduction mechanism and the drive axle; When the clutch is disconnected, the first shift mechanism is disconnected, and the second shift mechanism is engaged, the first motor works, and after the torque is amplified by the first reduction mechanism, it is transmitted to the drive shaft of the drive axle through the second shift mechanism to drive the vehicle wheels, thereby realizing a pure electric mode of single-motor drive; When the clutch is disconnected, the first shift mechanism is engaged, and the second shift mechanism is engaged, the first motor and the second motor work simultaneously, the first motor amplifies the torque through the first reduction mechanism and transmits it to the drive shaft of the drive axle through the second shift mechanism; the second motor amplifies the torque through the second reduction mechanism and transmits it to the drive shaft of the drive axle through the first shift mechanism and the second shift mechanism, and is used to drive the vehicle wheels, thereby realizing a pure electric mode of dual-motor drive; When the clutch is engaged, the first shift mechanism is disengaged and the second shift mechanism is engaged, the engine is operated to charge the battery through the clutch, the second reduction mechanism and the second motor in sequence; the first motor amplifies the torque through the first reduction mechanism and transmits it to the drive shaft of the drive axle through the second shift mechanism for driving the vehicle wheels, thereby realizing a series mode in which the battery is charged and the vehicle is driven simultaneously; When the clutch is engaged, the first shift mechanism is engaged, and the second shift mechanism is disengaged, the engine is operated, and power is provided to the drive axle through the clutch, the first shift mechanism, and the second shift mechanism in sequence; the second motor amplifies the torque through the second reduction mechanism, and transmits the power to the drive shaft of the drive axle through the first shift mechanism and the second shift mechanism, thereby realizing the first parallel mode of single-motor hybrid in which the second motor and the engine dual power sources work simultaneously; When the clutch is engaged, the first shift mechanism is engaged, and the second shift mechanism is engaged, the engine works, and the wheel transmission is carried out through the clutch, the first shift mechanism, and the drive shaft of the drive axle in sequence; the first motor works, and the wheel transmission is carried out through the first reduction mechanism to the drive axle; the second motor amplifies the torque through the second reduction mechanism and the first shift mechanism and transmits it to the drive shaft of the drive axle, realizing the second parallel mode of dual-motor hybrid.

2. The system according to claim 1, characterized in that The system further comprises a fifth transmission mechanism, wherein the first reduction mechanism is a planetary reducer; wherein: The fifth transmission mechanism is engaged with the first gear of the second shift mechanism, the fifth transmission mechanism is connected to the intermediate shaft of the planetary carrier of the first reduction mechanism, and the sun gear intermediate shaft of the first reduction mechanism is coaxially fixedly connected to the first motor.

3. The system according to claim 1, characterized in that The system further comprises a second transmission mechanism, wherein the second reduction mechanism is a planetary reducer, wherein: The other end of the clutch is connected to the second reduction mechanism through the second transmission mechanism, the output shaft of the second reduction mechanism is connected to the second transmission mechanism, and the input shaft of the second reduction mechanism is connected to the second motor shaft.

4. The system according to claim 1, characterized in that The system further comprises a first transmission mechanism, wherein one end of the first shift mechanism away from the clutch is connected to the first reduction mechanism via an output shaft of the first transmission mechanism, and the first reduction mechanism is a planetary reducer.

5. The system according to claim 1, characterized in that The system further comprises a transmission mechanism, and the first shift mechanism or the second shift mechanism is further connected to the drive axle via the transmission mechanism.

6. The system according to claim 5, characterized in that The speed change mechanism is a two-speed gearbox, and the speed change mechanism includes a fifth gear shift mechanism and a third transmission mechanism; the fifth gear shift mechanism includes a first gear, a second gear and an intermediate gear, the first gear of the fifth gear shift mechanism can be meshed and linked with the intermediate gear of the fifth gear shift mechanism through a gear set, the second gear of the fifth gear shift mechanism can be meshed and linked with the intermediate gear of the fifth gear shift mechanism through a gear set; the first gear of the fifth gear shift mechanism and the second gear of the fifth gear shift mechanism can also be linked through the third transmission mechanism; The first gear position of the fifth gear shift mechanism is linked to the first gear shift mechanism or the second gear shift mechanism, and the middle gear position of the fifth gear shift mechanism is connected to the driving shaft of the driving axle.

7. The system according to claim 6, characterized in that The speed change mechanism is a four-speed gearbox, and the speed change mechanism includes a sixth gear change mechanism, a seventh gear change mechanism and a fourth transmission mechanism; the sixth gear change mechanism includes a first gear, a second gear and an intermediate gear, and the first gear of the sixth gear change mechanism can be meshed and linked with the intermediate gear of the sixth gear change mechanism through a gear set, and the second gear of the sixth gear change mechanism can be meshed and linked with the intermediate gear of the sixth gear change mechanism through a gear set; The seventh gear shift mechanism comprises a first gear, a second gear and an intermediate gear, the intermediate gear of the seventh gear shift mechanism can be meshed and linked with the first gear of the seventh gear shift mechanism through a gear set, and the intermediate gear of the seventh gear shift mechanism can be meshed and linked with the second gear of the seventh gear shift mechanism through a gear set; The first gear position of the sixth gear shift mechanism can be linked with the first gear shift mechanism or the second gear shift mechanism, and the intermediate gear position of the sixth gear shift mechanism can be linked with the drive shaft through the intermediate gear position of the seventh gear shift mechanism; The first gear position of the sixth gear shift mechanism, the second gear position of the sixth gear shift mechanism, the first gear position of the seventh gear shift mechanism, and the second gear position of the seventh gear shift mechanism can also be linked through the fourth transmission mechanism.

8. The system according to claim 1, characterized in that The drive axle is a single drive axle or a double mechanical drive axle.

9. A vehicle, characterized in that: Comprising a system as claimed in any one of claims 1 to 8.

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