Four-wheel-drive hybrid electric vehicle system and four-wheel-drive hybrid electric vehicle

Abstract

The invention provides a four-wheel-drive hybrid electric vehicle system and a four-wheel-drive hybrid electric vehicle, the four-wheel-drive hybrid electric vehicle system is used for conveying power to two pairs of wheels of the vehicle, the two wheels of one pair of wheels are connected through a speed reduction differential mechanism, the two wheels of the other pair of wheels are connected through an electric drive axle, the system comprises a motor and an engine, and the motor and the engine are arranged in a spaced mode; the output end of the motor is connected with the output end of the engine through the first transmission clutch mechanism; the output end of the motor is connected with the speed reduction differential mechanism through the second transmission clutch mechanism; the battery is electrically connected with the motor and the electric drive axle; according to the system, the engine, the motor connected with the engine and the pure electric drive axle form a flexibly-driven four-wheel-drive hybrid electric vehicle system, and compared with the prior art, due to the fact that one motor is omitted, the manufacturing cost is lower, the weight is lighter, and the size is smaller.

Description

Technical Field

[0001] The present invention belongs to the technical field of power transmission, and more specifically, relates to a four-wheel drive hybrid vehicle system and a four-wheel drive hybrid vehicle. Background Art

[0002] The market acceptance of hybrid electric vehicles is increasing rapidly, but the existing technical solutions are too expensive to completely replace fuel vehicles. Compared with pure fuel vehicles, the added costs of hybrid vehicles and plug-in hybrid vehicles include batteries, motors, power coupling and transmission systems, fuel evaporative pollutant control systems, etc. Among them, the cost of motors is second only to batteries and is one of the main factors affecting the cost of the entire vehicle.

[0003] At present, common hybrid four-wheel drive vehicles are generally composed of an electric drive axle and a hybrid drive system. There are three main categories, including the THS system with planetary gear coupling, the P2 system based on a high-torque automatic transmission, and the P13 system based on a series-parallel connection of dual motors. The P13 series-parallel system has the largest installed capacity. However, there are two motors in the P13 series-parallel system. This is because the P13 series-parallel system cannot guarantee that the engine can participate in the drive at all vehicle speeds. If the vehicle is at a low speed for a long time, the vehicle must rely on electric drive, and the battery storage capacity is limited. Therefore, there must be a motor in the P13 series-parallel system as a generator to work with the engine to power the electric drive system, that is, the series driving mode. At this time, because two motors need to be arranged in the system, the axial size of the four-wheel drive hybrid vehicle system will be larger, and it will be difficult to arrange it on some models. In addition, the manufacturing cost of the motor is high, which will lead to an increase in the cost of the entire four-wheel drive hybrid vehicle system.

[0004] To this end, the purpose of the present invention is to provide a hybrid power coupling transmission arrangement scheme that is simpler in structure and lower in cost than the P13 series-parallel system, so as to further reduce the manufacturing cost of the four-wheel drive hybrid vehicle system. Summary of the invention

[0005] The purpose of the present invention is to provide a four-wheel drive hybrid vehicle system and a four-wheel drive hybrid vehicle in view of the deficiencies in the existing technology, so as to solve the problem that the existing four-wheel drive hybrid vehicle system proposed in the above background technology has two motors arranged in the system to avoid power exhaustion during electric drive, which will cause layout difficulties on some vehicle models and increase the manufacturing cost.

[0006] In order to achieve the above object, the present invention provides a four-wheel drive hybrid vehicle system for transmitting power to two pairs of wheels of the vehicle, wherein two wheels of one pair of wheels are connected through a reduction differential mechanism, and two wheels of another pair of wheels are connected through an electric drive axle, and the system comprises:

[0007] A motor and an engine, wherein the motor and the engine are arranged at an interval;

[0008] a first transmission clutch mechanism, wherein the output end of the motor is connected to the output end of the engine via the first transmission clutch mechanism;

[0009] A second transmission clutch mechanism, wherein the output end of the motor is connected to the reduction differential mechanism via the second transmission clutch mechanism;

[0010] A battery is electrically connected to the motor and the electric drive axle.

[0011] Preferably, the first transmission clutch mechanism comprises:

[0012] Input shaft;

[0013] A first clutch, wherein the input shaft is connected to the output end of the engine through the first clutch.

[0014] Preferably, the second transmission clutch mechanism comprises:

[0015] Output shaft;

[0016] A first gear set, wherein the output shaft is connected to the reduction differential mechanism through the first gear set;

[0017] a second gear set connected to the input shaft;

[0018] The second clutch, the first gear set and the second gear set are connected through the output shaft and the second clutch.

[0019] Preferably, when the motor and the engine are arranged opposite to each other, the output end of the motor is connected to the input shaft.

[0020] Preferably, when the motor is arranged on the side of the input shaft, the first transmission clutch mechanism further includes a third gear set, and the output end of the motor is connected to the output shaft through the third gear set.

[0021] Preferably, when the motor is arranged on the side of the input shaft, the first transmission clutch mechanism further includes a transmission gear, the output end of the motor is connected to the transmission gear, and the transmission gear is meshedly connected to the second gear set.

[0022] Preferably, the first gear set includes a first driving gear and a first driven gear, the first driving gear is connected to the output shaft, the first driven gear is connected to the reduction differential mechanism, and the first driving gear and the first driven gear are meshingly connected.

[0023] Preferably, the second gear set includes a second driving gear and a second driven gear, the second driving gear is connected to the input shaft, and the second driven gear is connected to the first driving gear and the output shaft via the second clutch.

[0024] Preferably, the third gear set includes a third driving gear and a third driven gear, the output end of the motor is connected to the third driving gear, the input shaft is connected to the third driven gear, and the third driving gear is meshingly connected to the third driven gear.

[0025] A four-wheel drive hybrid vehicle comprises a four-wheel drive hybrid vehicle system.

[0026] The present invention provides a four-wheel drive hybrid vehicle system and a four-wheel drive hybrid vehicle, which have the following beneficial effects: the output end of the motor of the system is connected to the output end of the engine through a first transmission clutch mechanism, the output end of the motor is connected to the reduction differential mechanism through a second transmission clutch mechanism, the battery is electrically connected to the motor and the electric drive axle, when the four-wheel drive hybrid vehicle is running at a low speed and is driven only by pure electricity, the electric drive axle uses the electric energy stored in the battery to drive the four-wheel drive hybrid vehicle to run, the first transmission clutch mechanism is engaged, the second transmission clutch mechanism is disengaged, the motor generates electricity together with the engine, and together with the battery, the drive axle drives the four-wheel drive hybrid vehicle to run, if the energy consumption of the four-wheel drive hybrid vehicle is greater than the power generation, the battery is in a discharged state, such as the four-wheel drive hybrid vehicle The energy consumption of the four-wheel drive vehicle is less than the power generation, and the battery is in a charging state. At this time, during long-term pure electric driving, the battery power is not easily exhausted and can be replenished in time; when parallel hybrid driving is used, the first transmission clutch mechanism is engaged, the second transmission clutch mechanism is engaged, and the engine directly drives the four-wheel drive hybrid vehicle. The motor can generate electricity or drive electrically according to the needs and control strategy of the four-wheel drive hybrid vehicle, and the electric drive axle can generate electricity or drive electrically according to the needs and control strategy of the four-wheel drive hybrid vehicle. The system consists of an engine, a motor connected to the engine and a pure electric drive axle to form a flexible drive four-wheel drive hybrid vehicle system. Compared with the prior art, due to the reduction of one motor, the manufacturing cost is lower, the weight is lighter and the volume is smaller.

[0027] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present invention.

[0029] Figure 1The schematic diagram shows a structure of a four-wheel drive hybrid vehicle system in which the second clutch is arranged opposite to the output shaft and the motor axis is opposite to the input shaft according to an embodiment of the present invention. Figure 1 ;

[0030] Figure 2 A schematic diagram showing a structure in which a second clutch of a four-wheel drive hybrid vehicle system according to an embodiment of the present invention is arranged between a second driven gear and an output shaft, and a motor is driven through a third gear set and an input shaft;

[0031] Figure 3 A schematic diagram showing a structure of a four-wheel drive hybrid vehicle system according to an embodiment of the present invention, in which a second clutch is arranged in meshing transmission between a second driven gear and an output shaft and a motor and a second driving gear through a transmission gear;

[0032] Figure 4 A schematic structural diagram showing a four-wheel drive hybrid vehicle system according to an embodiment of the present invention when a second clutch is arranged on a first driving gear and an output shaft;

[0033] Figure 5 A schematic structural diagram of a four-wheel drive hybrid vehicle system according to an embodiment of the present invention is shown when a single-plate friction clutch is used as the second clutch.

[0034] Description of reference numerals:

[0035] 1. Wheels; 2. Reduction differential mechanism; 3. Electric drive axle; 4. Motor; 5. Engine; 6. Battery; 7. Input shaft; 8. First clutch; 9. Output shaft; 10. First gear set; 11. Second gear set; 12. Second clutch; 13. Third gear set; 14. Transmission gear. DETAILED DESCRIPTION

[0036] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0037] like Figure 1 and Figure 4 As shown, the present invention provides a four-wheel drive hybrid vehicle system for transmitting power to two pairs of wheels of a vehicle, wherein two wheels 1 of one pair of wheels 1 are connected via a reduction differential mechanism 2, and two wheels 1 of another pair of wheels 1 are connected via an electric drive axle 3, and the system comprises:

[0038] The motor 4 and the engine 5 are arranged at intervals;

[0039] A first transmission clutch mechanism, wherein the output end of the motor 4 is connected to the output end of the engine 5 via the first transmission clutch mechanism;

[0040] A second transmission clutch mechanism, wherein the output end of the motor 4 is connected to the reduction differential mechanism 2 via the second transmission clutch mechanism;

[0041] The battery 6 is electrically connected to the motor 4 and the electric drive axle 3 .

[0042] Specifically, in order to solve the problem of existing four-wheel drive hybrid vehicle systems, in order to avoid power exhaustion during electric drive, two motors are arranged in the system, which will be difficult to arrange in some vehicle models and increase the manufacturing cost. The present invention provides a four-wheel drive hybrid vehicle system, in which the output end of the motor 4 is connected to the output end of the engine 5 through a first transmission clutch mechanism, the output end of the motor 4 is connected to the reduction differential mechanism 2 through a second transmission clutch mechanism, the battery 6 is electrically connected to the motor 4 and the electric drive bridge 3, when the four-wheel drive hybrid vehicle is traveling at a low speed and is only driven by pure electricity, the electric drive bridge 3 uses the electric energy stored in the battery 6 to drive the four-wheel drive hybrid vehicle to travel, the first transmission clutch mechanism is engaged, the second transmission clutch mechanism is disengaged, the motor 4 generates electricity together with the engine 5, and together with the battery 6 supplies power to the drive bridge 3 to drive the four-wheel drive hybrid vehicle to travel, such as When the energy consumption of a hybrid vehicle is greater than the power generation, the battery 6 is in a discharging state. When the energy consumption of a four-wheel drive hybrid vehicle is less than the power generation, the battery 6 is in a charging state. At this time, during long-term pure electric driving, the power of the battery 6 is not easily exhausted and can be replenished in time. When parallel hybrid driving is performed, the first transmission clutch mechanism is engaged, the second transmission clutch mechanism is engaged, the engine 5 directly drives the four-wheel drive hybrid vehicle, the motor 4 can generate electricity or drive electrically according to the needs and control strategy of the four-wheel drive hybrid vehicle, and the electric drive axle 3 can generate electricity or drive electrically according to the needs and control strategy of the four-wheel drive hybrid vehicle. The system constitutes a flexible drive four-wheel drive hybrid vehicle system through an engine 5, a motor 4 connected to the engine 5 and a pure electric drive axle 3. Compared with the prior art, due to the reduction of one motor 4, the manufacturing cost is lower, the weight is lighter and the volume is smaller.

[0043] Preferably, the first transmission clutch mechanism comprises:

[0044] Input shaft 7;

[0045] The first clutch 8 , the input shaft 7 is connected to the output end of the engine 5 via the first clutch 8 .

[0046] Specifically, when the first clutch 8 is engaged, the power of the engine 5 is input to the input shaft through the first clutch 8 , and when the first clutch 8 is disengaged, the engine 5 is disconnected from the input shaft 7 .

[0047] Preferably, the second transmission clutch mechanism comprises:

[0048] Output shaft 9;

[0049] The first gear set 10, the output shaft 9 is connected to the reduction differential mechanism 2 through the first gear set 10;

[0050] A second gear set 11, the second gear set 11 is connected to the input shaft 7;

[0051] The second clutch 12 , the first gear set 10 and the second gear set 11 are connected to the output shaft 9 via the second clutch 12 .

[0052] Specifically, when the second clutch 12 is engaged, the power of the engine 5 and / or the power of the motor 4 is input into the reduction differential mechanism 2 through the input shaft 7, the second gear set 11, the output shaft 9, and the first gear set 10 in sequence. When the second clutch 12 is disengaged, the second gear set 11 is disconnected from the first gear set 10.

[0053] like Figure 5 As shown, the first clutch 8 and the second clutch 12 are selected according to the layout space requirements, operation control requirements, etc., including but not limited to dry friction clutch, wet clutch, single-plate friction clutch, multi-plate friction clutch, synchronizer clutch device, meshing sleeve clutch device and different types of combinations thereof, and the operation control mode may include hydraulic, pneumatic, and electronically controlled mechanical.

[0054] like Figure 1 As shown, preferably, when the motor 4 and the engine 5 are arranged opposite to each other, the output end of the motor 4 is connected to the input shaft 7 .

[0055] like Figure 2 As shown, preferably, when the motor 4 is arranged on the side of the input shaft 7 , the first transmission clutch mechanism further includes a third gear set 13 , and the output end of the motor 4 is connected to the output shaft 9 through the third gear set 13 .

[0056] like Figure 3 As shown, preferably, when the motor 4 is arranged on the side of the input shaft 7, the first transmission clutch mechanism also includes a transmission gear 14, the output end of the motor 4 is connected to the transmission gear 14, and the transmission gear 14 is meshed and connected with the second gear set 11.

[0057] Specifically, according to the space layout requirements of the vehicle, the motor 4 can be arranged relative to the engine 5, and the motor 4 can be set on the side of the input shaft and connected through the enemy gear set 13 or meshed with the second gear set through the transmission gear 14.

[0058] When the motor 4 and the engine 5 are arranged opposite to each other, the output end of the motor 4 is coaxial with the input shaft 7 . When the motor 4 is arranged on the side of the input shaft, the transmission is performed through the third gear set 13 , or through the transmission gear 14 .

[0059] Preferably, the first gear set 10 includes a first driving gear and a first driven gear, the first driving gear is connected to the output shaft 9, the first driven gear is connected to the reduction differential mechanism 2, and the first driving gear and the first driven gear are meshingly connected.

[0060] Specifically, the reduction differential mechanism 2 includes a reducer and a differential, and the first gear set may be a gear in the reducer.

[0061] Preferably, the second gear set 11 includes a second driving gear and a second driven gear, the second driving gear is connected to the input shaft 7 , and the second driven gear is connected to the first driving gear through the second clutch 12 and the output shaft 9 .

[0062] Specifically, Figure 3 As shown, the second clutch 12 is arranged between the second driven gear and the output shaft 9, or as shown in Figure 4 As shown, it is arranged between the first driving gear and the output shaft 9, or as shown Figure 5 As shown, it is arranged on the output shaft 9.

[0063] Preferably, the third gear set 13 includes a third driving gear and a third driven gear, the output end of the motor 4 is connected to the third driving gear, the input shaft 7 is connected to the third driven gear, and the third driving gear is meshedly connected to the third driven gear.

[0064] Preferably, the third driven gear can be formed as a single part with the second driving gear.

[0065] Preferably, the battery is electrically connected to the motor 4 and the electric drive axle 3 via cables.

[0066] A four-wheel drive hybrid vehicle comprises a four-wheel drive hybrid vehicle system.

[0067] Preferably, the four-wheel drive hybrid vehicle also includes two pairs of wheels 1, the two wheels 1 of one pair of wheels 1 are connected by a reduction differential mechanism 2, and the two wheels 1 of the other pair of wheels 1 are connected by an electric drive axle 3. One pair of wheels 1 is the front wheels of the four-wheel drive hybrid vehicle, and the other pair of wheels 1 is the rear wheels of the four-wheel drive hybrid vehicle.

[0068] In summary, when the four-wheel drive hybrid vehicle system of the present application is applied to a four-wheel drive hybrid vehicle, the driving functions that can be achieved are as follows:

[0069] Pure electric drive axle two-wheel drive: the second clutch 12 is disengaged, and the electric drive axle 3 uses the electric energy stored in the battery 6 to drive the four-wheel drive hybrid vehicle;

[0070] Pure electric motor two-wheel drive: the electric drive axle 3 does not work, the second clutch 12 is engaged, the first clutch 8 is disengaged, and the motor 4 uses the electric energy stored in the battery 6 to drive the four-wheel drive hybrid vehicle to travel;

[0071] Pure electric four-wheel drive: the electric drive axle 3 uses the electric energy stored in the battery 6 to drive the four-wheel drive hybrid vehicle to drive, the second clutch 12 is engaged, the first clutch 8 is disengaged, and the motor 4 uses the electric energy stored in the battery 6 to drive the four-wheel drive hybrid vehicle to drive;

[0072] The engine and the motor are connected in parallel for two-wheel drive: the electric drive axle 3 does not work, the first clutch 8 is engaged, the second clutch 12 is engaged, and the motor 4 uses the electric energy stored in the battery 6 to drive the four-wheel drive hybrid vehicle in parallel with the engine 5; the engine and the motor are connected in parallel for four-wheel drive: the electric drive axle 3 uses the electric energy stored in the battery 6 to drive the four-wheel drive hybrid vehicle, the first clutch 8 is engaged, the second clutch 12 is engaged, and the motor 4 uses the electric energy stored in the battery 6 to drive the four-wheel drive hybrid vehicle in parallel with the engine 5;

[0073] The engine and the motor are connected in series for two-wheel drive: the electric drive axle 3 uses the electric energy stored in the battery 6 to drive the four-wheel drive hybrid vehicle, the first clutch 8 is engaged, the second clutch 12 is disengaged, the motor 4 generates electricity together with the engine 5, and together with the battery 6, the drive axle 3 is connected in parallel to drive the four-wheel drive hybrid vehicle. If the energy consumption of the four-wheel drive hybrid vehicle is greater than the power generation, the battery 6 is in a discharging state. If the energy consumption of the four-wheel drive hybrid vehicle is less than the power generation, the battery 6 is in a charging state.

[0074] The engine and the motor are connected in series and in parallel with the four-wheel drive: the electric drive axle 3 drives the four-wheel drive hybrid vehicle to drive, the first clutch 8 is engaged, the second clutch 12 is engaged, and the engine 5 generates electricity together with the motor 4 while driving the four-wheel drive hybrid vehicle to drive, and together with the battery 6, the drive axle 3 is connected in parallel to drive the four-wheel drive hybrid vehicle to drive, if the other electrical energy consumption of the electric drive axle 3 is greater than the power generation, the battery 6 is in a discharging state, if the electric drive axle 3 and other electrical energy consumption is less than the power generation, the battery 6 is in a charging state.

[0075] The four-wheel drive hybrid vehicle system integrates multiple driving functions, and different driving functions can be selected as needed. When the four-wheel drive hybrid vehicle is traveling at a low speed and is driven only by pure electricity, the electric drive bridge 3 uses the electric energy stored in the battery 6 to drive the four-wheel drive hybrid vehicle, the first clutch 8 is engaged, the second clutch 12 is disengaged, the motor 4 generates electricity together with the engine 5, and supplies power to the drive bridge 3 together with the battery 6 to drive the four-wheel drive hybrid vehicle. If the energy consumption of the four-wheel drive hybrid vehicle is greater than the power generation, the battery 6 is in a discharging state. If the energy consumption of the four-wheel drive hybrid vehicle is less than the power generation, the battery 6 is in a charging state. At this time, during long-term pure electric driving, the power of the battery 6 is not easily exhausted and can be replenished in time. The system forms a flexible drive four-wheel drive hybrid vehicle system through an engine 5, a motor 4 connected to the engine 5, and a pure electric drive bridge 3. Compared with the prior art, due to the reduction of one motor 4, the manufacturing cost is lower, the weight is lighter, and the volume is smaller.

[0076] A generator involves the design of the motor stator and rotor, motor driver, motor heat dissipation and electromagnetic system. The current device cost is more than 3,000 yuan, and the motor is large in size and weight, which makes it difficult to control the axial length of the system and difficult to arrange in many car models. This application only uses the clutch to make the vehicle no longer need this motor, and a pair of clutches costs only tens to hundreds of yuan, the axial size can be controlled within tens of millimeters, and the weight is only a few kilograms. Taking a passenger car as an example, therefore, this application has lower cost, lighter weight and smaller size.

[0077] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A four-wheel drive hybrid vehicle system for transmitting power to two pairs of wheels of a vehicle, wherein two wheels of one pair of wheels are connected by a reduction differential mechanism, and two wheels of another pair of wheels are connected by an electric drive axle, characterized in that: The system includes: Motors and engines; a first transmission clutch mechanism, wherein the output end of the motor is connected to the output end of the engine via the first transmission clutch mechanism; A second transmission clutch mechanism, wherein the output end of the motor is connected to the reduction differential mechanism via the second transmission clutch mechanism; A battery is electrically connected to the motor and the electric drive axle.

2. A four-wheel drive hybrid vehicle system according to claim 1, characterized in that: The first transmission clutch mechanism comprises: Input shaft; A first clutch, wherein the input shaft is connected to the output end of the engine through the first clutch.

3. A four-wheel drive hybrid vehicle system according to claim 2, characterized in that: The second transmission clutch mechanism comprises: Output shaft; A first gear set, wherein the output shaft is connected to the reduction differential mechanism through the first gear set; a second gear set connected to the input shaft; A second clutch, the first gear set and the second gear set are connected to the output shaft through the second clutch.

4. A four-wheel drive hybrid vehicle system according to claim 3, characterized in that: When the motor is arranged opposite to the engine, the output end of the motor is connected to the input shaft.

5. The four-wheel drive hybrid vehicle system according to claim 3, characterized in that: When the motor is arranged on the side of the input shaft, the first transmission clutch mechanism further includes a third gear set, and the output end of the motor is connected to the output shaft through the third gear set.

6. A four-wheel drive hybrid vehicle system according to claim 3, characterized in that: When the motor is arranged on the side of the input shaft, the first transmission clutch mechanism further includes a transmission gear, the output end of the motor is connected to the transmission gear, and the transmission gear is meshedly connected to the second gear set.

7. The four-wheel drive hybrid vehicle system according to claim 3, characterized in that: The first gear set includes a first driving gear and a first driven gear, the first driving gear is connected to the output shaft, the first driven gear is connected to the reduction differential mechanism, and the first driving gear and the first driven gear are meshingly connected.

8. The four-wheel drive hybrid vehicle system according to claim 7, characterized in that: The second gear set includes a second driving gear and a second driven gear, the second driving gear is connected to the input shaft, and the second driven gear is connected to the first driving gear and the output shaft via the second clutch.

9. The four-wheel drive hybrid vehicle system according to claim 5, characterized in that: The third gear set includes a third driving gear and a third driven gear. The output end of the motor is connected to the third driving gear, the input shaft is connected to the third driven gear, and the third driving gear is meshedly connected to the third driven gear.

10. A four-wheel drive hybrid vehicle, characterized in that: It comprises a four-wheel drive hybrid vehicle system according to any one of claims 1-9.

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