Double-clutch two-gear longitudinal front-drive hybrid system and vehicle

Abstract

The utility model discloses a double-clutch two-gear longitudinal front-drive hybrid power system and a vehicle, the double-clutch two-gear longitudinal front-drive hybrid power system comprises an engine input shaft, double clutches, a first motor and a second motor, the double clutches comprise a clutch C1 and a clutch C2, and the engine input shaft is connected with the clutch C1; the second motor is connected with a second planet row, the second planet row comprises a second planet carrier, and the second planet carrier is connected with the C2 clutch; the first motor is connected with a first planet row, the first planet row comprises a first planet carrier, the first planet carrier is in meshed connection with first motor output teeth, the first motor output teeth are fixedly connected with an intermediate shaft, the end of the intermediate shaft is connected with a differential mechanism, output shafts are arranged at the two ends of the differential mechanism, and a gear shifting mechanism is arranged between the double clutch and the intermediate shaft. By the adoption of the double-clutch two-gear longitudinal front-drive hybrid power system, the fuel economy of the whole vehicle is improved, and the power performance of the whole vehicle is improved.

Description

Technical Field

[0001] The present invention belongs to the field of automobile drive systems, and in particular relates to a dual-clutch two-speed longitudinal front-wheel drive hybrid system and a vehicle. Background Art

[0002] A hybrid vehicle system is a vehicle powertrain that combines an internal combustion engine and an electric motor. This system is designed to improve fuel efficiency, reduce emissions, and provide better driving performance.

[0003] In current automotive hybrid systems, the generator cannot be decoupled from the engine when the engine is directly driven, so the engine will drag the generator to idle, resulting in no-load losses in the generator and low fuel economy of the entire vehicle. In hybrid systems, the generator can only generate electricity and cannot participate in pure electric drive during the vehicle's starting phase. As a result, the vehicle can only be accelerated by the drive motor during the pure electric phase, forcing the drive motor to be very large, which limits the space in the vehicle body, makes layout difficult, and also results in a waste of cost.

[0004] Patent publication number CN109941081A, published on January 28, 2019, discloses a parallel-shaft dual-motor, two-speed electric drive transmission. The transmission comprises a transmission housing, a main motor, an auxiliary motor, and an input spindle and intermediate shaft mounted on the transmission housing. The main motor's rotating shaft is connected to the input spindle, while the auxiliary motor's rotating shaft is connected to the input spindle via a one-way clutch. A synchronizer and two freely rotating driving gears of different diameters are coaxially mounted on the input spindle. The synchronizer's driving plate is coaxially fixed to the input spindle, the right driven plate is coaxially fixed to the first driving gear, and the left driven plate is coaxially fixed to the second driving gear. A reduction drive gear and two driven gears are coaxially fixed to the intermediate shaft, with the first driven gear meshing with the first driving gear and the second driven gear meshing with the second driving gear. This parallel-shaft dual-motor, two-speed electric drive transmission does not resolve the aforementioned technical issues. Summary of the Invention

[0005] The purpose of the present invention is to address the deficiencies of the existing technology and provide a dual-clutch two-speed longitudinal front-wheel drive hybrid system that improves the fuel economy and power performance of the vehicle.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] The dual-clutch, two-speed longitudinal front-wheel drive hybrid system includes an engine input shaft, a dual clutch, a first motor and a second motor. The dual clutch includes a C1 clutch and a C2 clutch, and the engine input shaft is connected to the C1 clutch; the second motor is connected to a second planetary gear set, which includes a second planetary carrier, which is connected to the C2 clutch; the first motor is connected to a first planetary gear set, which includes a first planetary carrier, which is meshed with the output teeth of the first motor, and the output teeth of the first motor are fixedly connected to an intermediate shaft, the end of the intermediate shaft is connected to a differential, and output shafts are provided at both ends of the differential. A shift mechanism is provided between the dual clutch and the intermediate shaft.

[0008] The dual clutch includes an external gear hub, on which are provided first-gear input teeth and second-gear input teeth, the first-gear input teeth being meshedly connected with the first-gear output teeth, and the second-gear input teeth being meshedly connected with the second-gear output teeth; the shifting mechanism includes a synchronizer, which is provided on an intermediate shaft, and the first-gear output teeth and the second-gear output teeth are both provided on the intermediate shaft and located on both sides of the synchronizer.

[0009] The output shaft of the first motor is connected to a first sun gear, the first sun gear is meshed with a first planet gear, the first planet gear is connected to a first planet carrier, the output shaft of the second motor is connected to a second sun gear, the second sun gear is meshed with a second planet gear, and the second planet gear is connected to a second planet carrier.

[0010] The second planet carrier is fixedly connected with a transmission shaft, and the transmission shaft passes through the first gear input gear and the second gear input gear.

[0011] The output shaft of the second motor passes through the output shaft of the first motor and the first sun gear.

[0012] The engine input shaft, the first motor and the second motor are all coaxially arranged.

[0013] The engine input shaft is arranged in parallel with the intermediate shaft.

[0014] The first planetary gear and the second planetary gear are located between the dual clutch and the first electric machine.

[0015] A vehicle including the aforementioned dual-clutch two-speed longitudinal front-wheel drive hybrid system.

[0016] The technical effects of the present invention are as follows: the dual-clutch two-speed longitudinal front-wheel drive hybrid system of the present invention is adopted, and the power decoupling of the generator and the engine is realized through the dual-clutch and synchronizer two-speed structure when the engine is directly driven, thereby avoiding the no-load loss of the engine directly driving the generator to idle, improving the fuel economy of the whole vehicle, and reducing the cost of using the vehicle; solving the problem that the generator can only generate electricity and cannot participate in pure electric drive in the starting stage of the whole vehicle, so that when the whole vehicle is in the pure electric starting stage, the generator can participate in pure electric drive through the dual-clutch and synchronizer, realizing the dual-motor drive mode of the whole vehicle starting, thereby improving the power performance of the whole vehicle, and is also beneficial to reducing the size of the drive motor, making it easier to arrange the drive motor on the whole vehicle; the design layout of each component is reasonable, and can meet the layout requirements of the drive system under space-constrained conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] This manual includes the following drawings, which show the following contents:

[0018] Figure 1 Schematic diagram of the dual-clutch two-speed longitudinal front-wheel drive hybrid system of the present invention.

[0019] The markings in the figure are: 1. Engine input shaft; 11. Dual clutch; 12. C1 clutch; 13. C2 clutch; 14. First gear input gear; 15. Second gear input gear; 16. Output shaft; 17. Differential; 2. First motor; 21. First planetary carrier; 22. First motor output gear; 23. First sun gear; 24. First planetary gear; 25. Ring gear; 3. Second motor; 31. Second planetary carrier; 32. Second sun gear; 33. Second planetary gear; 34. Drive shaft; 4. Intermediate shaft; 41. First gear output gear; 42. Second gear output gear; 43. Synchronizer. DETAILED DESCRIPTION

[0020] The following is a further detailed description of the specific implementation methods of the present invention through the description of the embodiments with reference to the accompanying drawings, with the aim of helping those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention and to facilitate their implementation.

[0021] like Figure 1As shown, the dual-clutch two-speed longitudinal front-wheel drive hybrid system includes an engine input shaft 1, a dual clutch 11, a first motor 2 and a second motor 3. The dual clutch 11 includes a C1 clutch 12 and a C2 clutch 13, and the engine input shaft 1 is connected to the C1 clutch 12; the second motor 3 is connected to a second planetary gear, and the second planetary gear includes a second planetary carrier 31, and the second planetary carrier 31 is connected to the C2 clutch 13; the first motor 2 is connected to a first planetary gear, and the first planetary gear includes a first planetary carrier 21, and the first planetary carrier 21 is meshed and connected to the first motor output gear 22, and the first motor output gear 22 is fixedly connected to the intermediate shaft 4, and the end of the intermediate shaft 4 is connected to the differential 17, and the two ends of the differential 17 are provided with output shafts 16, and a shift mechanism is provided between the dual clutch 11 and the intermediate shaft 4.

[0022] The working principle of the dual-clutch two-speed longitudinal front-wheel drive hybrid system is as follows: the engine input shaft 1 is connected to the C1 clutch 12 friction plate of the dual-clutch, the C2 clutch 13 friction plate of the dual-clutch 11 is connected to the second planetary carrier 31, the dual-clutch 11 outer gear hub is connected to the first gear / second gear output gear 42 through the first gear / second gear output gear 42, and the first and second gear gear switching is realized through the synchronizer 43, the first motor 2 is connected to the first sun gear 23, and the power of the first motor 2 is transmitted to the first motor output gear 22 through the first sun gear 23 and the first planetary carrier 21, the second motor 3 is connected to the second sun gear 32, and the power is connected to the dual-clutch 11 gear hub through the C2 clutch 13, the gear hub is connected to the first and second gear driving gears, and the power is transmitted to the output shaft 16 through the intermediate differential 17 to realize power output.

[0023] Through the setting of the dual clutch 11, in the extended range mode or parking power generation mode, the second motor 3 acts as a generator, and the power of the fuel combustion will be transmitted to the second planetary carrier 31 through the dual clutch 11, thereby charging the battery, so that the vehicle can run for a long time without a charging pile.

[0024] like Figure 1 As shown, the dual clutch 11 includes an external gear hub, on which are mounted first-gear input teeth 14 and second-gear input teeth 15. The first-gear input teeth 14 mesh with the first-gear output teeth 41, while the second-gear input teeth 15 mesh with the second-gear output teeth 42. The shift mechanism includes a synchronizer 43, which is mounted on the intermediate shaft 4. The first-gear output teeth 41 and the second-gear output teeth 42 are both located on the intermediate shaft 4 and on either side of the synchronizer 43. The first-gear input teeth 14 and the second-gear input teeth 15 are used for driving the vehicle in first and second gears, respectively. Gear shifting between these two gears is achieved via the synchronizer 43. Engagement of the synchronizer 43 with either the first-gear input teeth 14 or the second-gear input teeth 15 transmits power from the second motor 3 to the wheels. When the synchronizer 43 is not engaged with either gear, the vehicle is in neutral, and the second motor 3 is either off or in generator mode.

[0025] like Figure 1 As shown, the output shaft of the first motor 2 is connected to the first sun gear 23, which is meshed with the first planetary gear 24, which is connected to the first planetary carrier 21. The output shaft of the second motor 3 is connected to the second sun gear 32, which is meshed with the second planetary gear 33, which is connected to the second planetary carrier 31. Both motors use planetary gears to transmit power, which can effectively reduce transmission losses, improve mechanical efficiency, enhance the transmission efficiency and response speed of the system, optimize the performance of the drive system, and make the system layout more reasonable and compact.

[0026] like Figure 1 As shown, the second planetary carrier 31 is fixedly connected to a transmission shaft 34, which passes through the first gear input teeth 14 and the second gear input teeth 15. Passing the transmission shaft 34 of the second planetary carrier 31 through the outer gear hub of the dual clutch 11 transmits the power of the second planetary gear of the second motor 3 to the dual clutch 11 without affecting the power transmission of the first gear input teeth 14 or the second gear input teeth 15. This also avoids spatial interference and reduces the difficulty of spatial layout.

[0027] like Figure 1 As shown, the output shaft of the second motor 3 passes through the output shaft of the first motor 2 and the first sun gear 23. In the above structure, the output shaft of the first motor 2 is hollowed, which enables the power of the second motor 3 to be transmitted to the second planetary gear set further away without affecting the power transmission between the output shaft 16 of the first motor 2 and the first planetary gear set, thereby reducing the difficulty of spatial layout.

[0028] like Figure 1 As shown, the engine input shaft 1, first motor 2, and second motor 3 are coaxially arranged. This coaxial arrangement saves interior space, which is beneficial for compact vehicles with limited space. It also reduces transmission components and overall vehicle weight, which helps improve fuel efficiency and performance. The coordinated operation of the motor and engine reduces energy loss during transmission, eliminating the need for additional transmission devices. This provides faster response and better power control, enabling flexible switching between different modes in the hybrid system and improving drivability.

[0029] like Figure 1 As shown, the engine input shaft 1 is arranged parallel to the intermediate shaft 4. This parallel design makes the overall structure compact, saves space, and facilitates installation and maintenance. It also meets the requirements of the longitudinal layout of the drive system and facilitates the configuration of combined gears according to different requirements to achieve different transmission ratios and output torques, making the configuration more flexible.

[0030] like Figure 1As shown, the first and second planetary gears are located between the dual clutch 11 and the first motor 2. Centralizing the planetary gears for the two motors saves space, making the system more compact and efficient, making it suitable for hybrid powertrains. It also reduces the impact of the planetary gear structure on surrounding components, enabling the axial arrangement of the dual clutch 11, planetary gears, and motors. This reduces assembly complexity and facilitates subsequent maintenance.

[0031] A vehicle including the aforementioned dual-clutch two-speed longitudinal front-wheel drive hybrid system.

[0032] This dual-clutch, two-speed longitudinal front-wheel drive hybrid system uses a dual clutch 11 structure to achieve decoupling between the engine and the generator (second motor 3). This allows the generator and the second motor 3 to be inoperative when the engine is directly driven. The complete decoupling of the generator (second motor 3) reduces the no-load loss of the generator (second motor 3) when the engine is directly driven, thereby improving the fuel economy of the entire vehicle. The dual clutch 11, combined with the use of a two-speed synchronizer 43 structure, can decouple the generator (second motor 3) from the engine power in all operating stages of the entire vehicle, thereby enabling the vehicle to start with pure electric drive of the dual motors, and the second motor 3 can be driven in neutral, first gear, and second gear through the synchronizer 43. At the same time, the dual clutch 11 and the synchronizer 43 structure can meet the vehicle's extended-range drive mode, decoupling the power of the engine and the second motor 3 from the wheels, and realizing a series extended-range drive mode.

[0033] The dual-clutch, two-speed longitudinal front-wheel drive hybrid system has the following modes:

[0034]

[0035]

[0036] The specific mode is as follows:

[0037] Single-motor pure electric drive mode: only the first motor 2 is working, both clutches are disconnected, the synchronizer 43 is in neutral, and the power output by the first motor 2 is transmitted from the first sun gear 23, the first planetary gear 24, the first planetary carrier 21, and the first motor output gear 22 to the differential 17 in sequence, and then the differential 17 transmits the power to the two output shafts 16 respectively.

[0038] Dual-motor pure electric drive mode: both motors are working, the engine is not working, the C1 clutch 12 is disengaged, the C2 clutch 13 is engaged, and the power output by the first motor 2 is transmitted to the first motor output tooth 22 through the planetary mechanism; the output of the second motor 3 is transmitted from the second sun gear 32, the second planetary gear 33, and the second planetary carrier 31 to the C2 clutch 13, so that the first gear input tooth 14 and the second gear input tooth 15 connected by the dual clutch 11 are transmitted. When the synchronizer 43 is in 1st gear, the first gear output tooth 41 outputs power, and the power of the first gear output tooth 41 and the first motor output tooth 22 are transmitted to the differential 17. When the synchronizer 43 is in 2nd gear, the second gear output tooth 42 outputs power, and the power of the second gear output tooth 42 and the first motor output tooth 22 are transmitted to the differential 17. The synchronizer 43 is used to switch gears while the vehicle is driving.

[0039] Engine direct drive mode: only the engine is working, the C1 clutch 12 is engaged, the C2 clutch 13 is disengaged, the engine power is transmitted from the engine input shaft 1 to the dual clutch 11, and when the synchronizer 43 is in 1st gear, the power is transmitted to the differential 17 by the 1st gear output gear 41; when the synchronizer 43 is in 2nd gear, the power is transmitted to the differential 17 by the 2nd gear output gear 42. In this mode, the engine and the second motor 3 are decoupled, avoiding no-load loss of the second motor 3.

[0040] Range-extended mode: In engine direct drive mode, the first motor 2 and the engine are working, the C1 clutch 12 and the C2 clutch 13 are both engaged, the synchronizer 43 is in neutral, and through the engagement of the C2 clutch 13, part of the engine power is transmitted to the second planetary carrier 31 through the dual clutch 11, thereby causing the second motor 3 to reverse and generate electricity, that is, electricity is generated by burning fuel to charge the battery.

[0041] Parallel drive mode: the first motor 2 and the engine are working, the second motor 3 is not working, the C1 clutch 12 is engaged, the C2 clutch 13 is disengaged, the power of the first motor 2 is transmitted to the first motor output tooth 22, and the engine power is transmitted from the engine input shaft 1 to the dual clutch 11, and the 1st gear or 2nd gear drive is achieved through the synchronizer 43 to meet driving requirements.

[0042] Three-power drive mode: Both motors and the engine are working, the C1 clutch 12 and the C2 clutch 13 are engaged, and 1st gear or 2nd gear drive is achieved through the synchronizer 43.

[0043] Parking power generation mode: In this mode, the engine is started, the second motor 3 acts as a generator, and the power of fuel combustion is transmitted to the second planetary carrier 31 to charge the battery.

[0044] Braking energy recovery mode: When the vehicle decelerates or brakes, kinetic energy is converted into electrical energy. The braking energy recovery system converts this kinetic energy into electrical energy and stores it in the battery, thereby reducing energy loss.

[0045] This dual-clutch two-speed longitudinal front-wheel drive hybrid system, through the two-speed structure of the dual clutch 11 and the synchronizer 43, realizes the power decoupling of the generator and the engine when the engine is directly driven, avoids the no-load loss of the engine directly driving the generator to idle, improves the fuel economy of the whole vehicle, and reduces the cost of vehicle use; solves the problem that the generator can only generate electricity and cannot participate in pure electric drive during the starting stage of the whole vehicle, so that during the pure electric starting stage of the whole vehicle, the generator can participate in pure electric drive through the dual clutch 11 and the synchronizer 43, realizing the dual-motor drive mode for the starting of the whole vehicle, thereby improving the power performance of the whole vehicle, and is also conducive to reducing the size of the drive motor, making it easier to arrange the drive motor on the whole vehicle; the design layout of each component is reasonable, which can meet the layout requirements of the drive system under space-constrained conditions.

[0046] The present invention has been described above with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described method. Any non-substantial improvements made using the method concepts and technical solutions of the present invention, or any direct application of the above-described concepts and technical solutions to other situations without modification, fall within the scope of protection of the present invention.

Claims

1. A dual-clutch two-speed longitudinal front-wheel drive hybrid system, characterized by: The invention comprises an engine input shaft (1), a dual clutch (11), a first motor (2) and a second motor (3), wherein the dual clutch (11) comprises a C1 clutch (12) and a C2 clutch (13), and the engine input shaft (1) is connected to the C1 clutch (12); the second motor (3) is connected to a second planetary gear, the second planetary gear comprises a second planetary carrier (31), and the second planetary carrier (31) is connected to the C2 clutch (13); the first motor (2) is connected to a first planetary gear, the first planetary gear comprises a first planetary carrier (21), the first planetary carrier (21) is meshedly connected to a first motor output tooth (22), the first motor output tooth (22) is fixedly connected to an intermediate shaft (4), the end of the intermediate shaft (4) is connected to a differential (17), and the two ends of the differential (17) are provided with output shafts (16), and a shift mechanism is provided between the dual clutch (11) and the intermediate shaft (4).

2. The dual-clutch two-speed longitudinal front-wheel drive hybrid system according to claim 1, characterized in that: The dual clutch (11) includes an external gear hub, on which a first-gear input tooth (14) and a second-gear input tooth (15) are provided, wherein the first-gear input tooth (14) is meshedly connected to a first-gear output tooth (41), and the second-gear input tooth (15) is meshedly connected to a second-gear output tooth (42); the shift mechanism includes a synchronizer (43), wherein the synchronizer (43) is provided on an intermediate shaft (4), and the first-gear output tooth (41) and the second-gear output tooth (42) are both provided on the intermediate shaft (4) and located on both sides of the synchronizer (43).

3. The dual-clutch two-speed longitudinal front-wheel drive hybrid system according to claim 2, characterized in that: The output shaft of the first motor (2) is connected to a first sun gear (23), the first sun gear (23) is meshedly connected to a first planet gear (24), the first planet gear (24) is connected to a first planet carrier (21), the output shaft of the second motor (3) is connected to a second sun gear (32), the second sun gear (32) is meshedly connected to a second planet gear (33), the second planet gear (33) is connected to a second planet carrier (31).

4. The dual-clutch two-speed longitudinal front-wheel drive hybrid system according to claim 2 or 3, characterized in that: The second planet carrier (31) is fixedly connected to a transmission shaft (34), and the transmission shaft (34) passes through the first gear input teeth (14) and the second gear input teeth (15).

5. The dual-clutch two-speed longitudinal front-wheel drive hybrid system according to claim 4, characterized in that: The output shaft of the second motor (3) passes through the output shaft of the first motor (2) and the first sun gear (23).

6. The dual-clutch two-speed longitudinal front-wheel drive hybrid system according to claim 4, characterized in that: The engine input shaft (1), the first motor (2) and the second motor (3) are all coaxially arranged.

7. The dual-clutch two-speed longitudinal front-wheel drive hybrid system according to claim 6, characterized in that: The engine input shaft (1) and the intermediate shaft (4) are arranged in parallel.

8. The dual-clutch two-speed longitudinal front-wheel drive hybrid system according to claim 7, characterized in that: The first planetary gear and the second planetary gear are located between the dual clutch (11) and the first motor (2).

9. A vehicle, characterized in that: Including the dual-clutch two-speed longitudinal front-wheel drive hybrid system according to any one of claims 1-8.

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