A four-gear, single-motor driven hybrid transmission

Abstract

The application discloses a four-gear single-motor-driven hybrid power transmission device, which comprises an engine, an input shaft, a C2 wet clutch, a C1 wet clutch, a driving motor, a motor driving gear, a motor driven gear, a motor shaft, an S3 sun gear, a planet carrier, an S2 sun gear, a P2 short planet wheel, a P3 long planet wheel, a B1 brake, a B2 brake, an outer ring gear, an output shaft driving gear, an output shaft driven gear, a front transmission shaft, a differential, and a half shaft flange. Different combinations of two clutches and two brakes, different working states of the engine and the motor can realize four-gear engine, EV gear and parallel mode, have energy recovery and parking power generation functions, the motor can also give quite effective assistance during acceleration, and the motor is designed with a reduction ratio, so that the performance of the motor is reduced under the condition that the wheel end torque is unchanged, and the effect of cost reduction is achieved.

Description

Technical Field

[0001] This invention belongs to the field of transmission technology and relates to a hybrid power device, specifically a hybrid power transmission device based on a dual single-stage planetary gear set and a single motor drive. Background Technology

[0002] With the rapid development and technological innovation of the automotive industry, and the gradual increase in the actual number of new energy vehicles in operation, the application of new energy hybrid power units in the field of transmissions is becoming more and more widespread. Hybrid power units can meet various power combination modes of engines, generators, and electric motors, and multi-speed transmissions can change the speed ratio according to different operating conditions, which can achieve better overall vehicle benefits. In the next few years, it will be the main development direction of new energy vehicles.

[0003] However, existing hybrid power systems have few gears, mainly single or two, with significant speed differences between gears and prominent issues such as large gear shift shocks. At the same time, battery placement is also a major challenge, especially since PHEVs have higher requirements for battery capacity, resulting in larger battery sizes. Summary of the Invention

[0004] The purpose of this invention is to provide a simple and compact four-speed, single-motor driven hybrid power transmission device, which also integrates a front drive shaft and enables longitudinal front-drive power.

[0005] The objective of this invention is achieved through the following technical solution: A four-speed, single-motor driven hybrid power transmission device includes an engine, an input shaft, a C2 wet clutch, a C1 wet clutch, a drive motor, a motor drive gear, a motor driven gear, a motor shaft, an S3 sun gear, a planet carrier, an S2 sun gear, a P2 short planet gear, a P3 long planet gear, a B1 brake, a B2 brake, an external gear ring, an output shaft drive gear, an output shaft driven gear, a front drive shaft, a differential, and a half-shaft flange, wherein: One end of the input shaft is connected to the engine, and the other end is connected to the C1 wet clutch and the C2 wet clutch; The C2 wet clutch is connected to the planetary carrier; The C1 wet clutch is connected to the S3 sun gear; The S3 sun gear is connected to the motor shaft; The motor shaft is connected to the motor driven gear via a spline; The motor drive gear is connected to the drive motor via a spline; The motor drive gear is connected to the motor driven gear to form a speed ratio i1; One end of the B1 brake is connected to the housing, and the other end is connected to the Ravina planetary carrier; One end of the B2 brake is connected to the housing, and the other end is connected to the S2 sun gear; One end of the P2 short planetary gear is connected to the S2 long sun gear, and the other end is connected to the P3 long planetary gear; One end of the external gear ring is connected to the P3 long planetary gear, and the other end is connected to the output shaft drive gear through a spline; The output shaft drive gear and the output shaft driven gear are connected to form a speed ratio i2; The driven gear of the output shaft is connected to the front drive shaft; The front drive shaft is connected to the differential; The half-shaft flange is connected to the half-shaft gear of the differential via a spline; The differential is connected to the half-shaft of the vehicle via a half-shaft flange, and power is transmitted to the wheels.

[0006] Compared with the prior art, the present invention has the following advantages: 1. This invention provides a hybrid vehicle drive device that, through a single motor and an Alavi planetary gear set structure, provides multiple drive modes, effectively reduces fuel consumption, and provides a new arrangement of new energy transmission mechanisms.

[0007] 2. Different combinations of two clutches and two brakes, and different working states of the engine and motor can realize four-speed engine, EV mode, and parallel mode. It has energy recovery and parking power generation functions. The motor can also provide quite effective assistance during acceleration. At the same time, the motor is designed with a reduction ratio, which can reduce the performance of the motor while keeping the wheel end torque unchanged, thereby achieving the effect of cost reduction.

[0008] 3. The gear ring of the planetary gear set and another planet carrier are rigid components, and the planet carrier is the transmission output end. The two planetary gear sets can be designed with independent transmission ratios, which have the characteristics of high transmission efficiency, low component speed and large transmission ratio. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the hybrid power transmission device in Specific Implementation Method 1; Figure 2 This is a schematic diagram of the hybrid power transmission device in the second specific implementation method; In the diagram, 1. Engine; 2. Input shaft; 3. C2 wet clutch; 4. C1 wet clutch; 5. Drive motor; 6. Motor drive gear; 7. Motor driven gear; 8. Motor shaft; 9. S3 sun gear; 10. Ravina planetary carrier; 11. S2 sun gear; 12. P2 short planetary gear; 13. P3 long planetary gear; 14. B1 brake; 15. B2 brake; 16. External gear ring; 17. Output shaft drive gear; 18. Output shaft driven gear; 19. Front drive shaft; 20. Differential; 21. Half-shaft flange. Detailed Implementation

[0010] The technical solution of the present invention will be further described below with reference to the accompanying drawings, but it is not limited thereto. Any modifications or equivalent substitutions to the technical solution of the present invention that do not depart from the spirit and scope of the technical solution of the present invention should be covered within the protection scope of the present invention.

[0011] Specific Implementation Method 1: This implementation method provides a four-speed, single-motor driven hybrid power transmission device, such as... Figure 1 As shown, the device includes an engine 1, an input shaft (including a shock absorber) 2, a C2 wet clutch 3, a C1 wet clutch 4, a drive motor 5, a motor drive gear 6, a motor driven gear 7, a motor shaft 8, an S3 sun gear 9, a Ravina planetary carrier 10, an S2 sun gear 11, a P2 short planetary gear 12, a P3 long planetary gear 13, a B1 brake 14, a B2 brake 15, an external gear ring 16, an output shaft drive gear 17, an output shaft driven gear 18, a front drive shaft 19, a differential 20, and a half-shaft flange 21, wherein: One end of the input shaft 2 is connected to the power system of the engine 1, and the other end is connected to the C1 wet clutch 4 and the C2 wet clutch 3. The C2 wet clutch 3 is connected to the rear Ravina planetary carrier 10; The C1 wet clutch 4 is connected to the S3 sun gear 9; The S3 sun gear 9 is connected to the motor shaft 8; The motor shaft 8 is connected to the motor driven gear 7 via a spline; The motor drive gear 7 is connected to the drive motor 5 via a spline; The motor drive gear 6 is connected to the motor driven gear 7 to form a speed ratio i1. This speed ratio is generally greater than 1 in order to reduce the torque of the motor and meet the power requirements of the whole vehicle. One end of the B1 brake 14 is connected to the housing, and the other end is connected to the Ravina planetary carrier 10; One end of the B2 brake 15 is connected to the housing, and the other end is connected to the S2 sun gear 11; One end of the P2 short planetary gear 12 is connected to the S2 long sun gear 11, and the other end is connected to the P3 long planetary gear 13; One end of the external gear ring 16 is connected to the P3 long planetary gear 13, and the other end is connected to the output shaft drive gear 17 via a spline. The output shaft drive gear 17 and the output shaft driven gear 18 are connected to form a speed ratio i2. This speed ratio is generally greater than 1 in order to reduce the torque of the motor and meet the power requirements of the whole vehicle. The driven gear 18 of the output shaft is connected to the front drive shaft 19; The front drive shaft 19 is connected to the differential 20; The half-shaft flange 21 is connected to the half-shaft gear of the differential 20 via a spline; The differential 20 is connected to the half-shaft of the vehicle via the half-shaft flange 21, and power is transmitted to the wheels.

[0012] In this embodiment, different combinations of the clutch and brake are used to achieve four engine gears, EV gear, and parallel mode. Detailed gear positions are shown in Table 1. After the four engine gears and two motor gears are established, the output is transmitted through the external gear ring 16.

[0013] Table 1 In this embodiment, the specific operation of the hybrid power transmission device is as follows: In gear 1: C1 wet clutch 4 and B1 brake 14 work together. Engine power 1 is transmitted to S3 sun gear 9 via input shaft 2 and C1 wet clutch 4, causing S3 sun gear 9 to rotate clockwise. This rotation, through P3 long planetary gear 13, drives the external gear ring 16 of Ravina planetary carrier 10 to rotate clockwise. The external gear ring 16 of Ravina planetary carrier 10 is connected to the output shaft, outputting power. In gear 1, the speed is low. When P3 long planetary gear 13 drives the external gear ring 16 assembly of Ravina planetary carrier 10 to rotate clockwise, it generates a torque on Ravina planetary carrier 10 to rotate counterclockwise. To prevent counterclockwise rotation, B1 brake 14 is engaged. Thus, engine power is transmitted to the output shaft drive gear 17 via input shaft, S3 sun gear, P3 long planetary gear 13, and external gear ring 16. The output shaft drive gear 17 connects to the output shaft driven gear 18 to form a first-level speed ratio. It is connected to the differential 20 through the front drive shaft 19 and transmitted to the half-shaft flange 21, which is connected to the half-shaft of the vehicle, and the power is transmitted to the wheels.

[0014] 2nd gear: C1 wet clutch 4 and B2 brake 15 work together. Engine power is transmitted to S3 sun gear 9 via input shaft 2 and C1 wet clutch 4, causing S3 sun gear 9 to rotate clockwise. This rotation, through P2 short planetary gear 12, drives P3 long planetary gear 13 to rotate clockwise. B2 brake 15 is engaged, and S2 sun gear 11 is fixed. At this time, while P3 long planetary gear 13 rotates clockwise, it also revolves clockwise, thereby driving the external gear ring 16 and output shaft to rotate clockwise at a faster speed. Engine power is then transmitted to Ravina planet carrier 10 via input shaft 2, S3 sun gear 9, P2 short planetary gear 12, and P3 long planetary gear 13. From there, it is transmitted to the external gear ring 16 and output shaft drive gear 17. The output shaft drive gear 17 connects to the output shaft driven gear 18 to form a first-level speed ratio. It is connected to the differential 20 through the front drive shaft 19 and transmitted to the half-shaft flange 21, which is connected to the half-shaft of the vehicle, and the power is transmitted to the wheels.

[0015] 3rd gear: C2 wet clutch 3 and C1 wet clutch 4 work together. Engine power is transmitted via input shaft 2, C2 wet clutch 3, and C1 wet clutch 4 to S3 sun gear 9 and Ravina planetary carrier 10. Input shaft 2 is connected to S3 sun gear 9 and Ravina planetary carrier 10 as a whole, and both rotate clockwise with input shaft 2 at the same speed. At this time, P2 short planetary gear 12 and P3 long planetary gear 13 cannot rotate on their own, but can only revolve together with S3 sun gear 9 and Ravina planetary carrier 10, driving the external gear ring 16 to rotate clockwise. At this time, engine power is directly transmitted to the external gear ring 16 and output shaft drive gear 17 via input shaft 2, S3 sun gear 9, and Ravina planetary carrier 10. Output shaft drive gear 17 connects to output shaft driven gear 18 to form a first-level speed ratio, and is transmitted to the differential 20 through front drive shaft 19, and then to the half-shaft flange 21, which connects to the half-shaft of the vehicle, and the power is transmitted to the wheels.

[0016] 4th gear: C2 wet clutch 3 and B2 brake 15 work together. Engine power is transmitted via input shaft 2 and C2 wet clutch 3 to Ravina planetary carrier 10, causing Ravina planetary carrier 10 to rotate clockwise. This rotates P2 long planetary gear 12 and P3 short planetary gear 13 clockwise, which in turn rotates the external ring gear 16 and output shaft 2 clockwise. B2 brake 15 fixes S2 sun gear 11. At this time, engine power is transmitted via input shaft 2 and Ravina planetary carrier 10, and then from Ravina planetary carrier 10 to external ring gear 16 and output shaft drive gear 17. Output shaft drive gear 17 connects to output shaft driven gear 18 to form a first-order speed ratio. This speed is transmitted via front drive shaft 19 to differential 20, and then to half-shaft flange 21, which connects to the vehicle's half-shaft, thus transmitting power to the wheels.

[0017] EV1 gear: Drive motor 5 and brake 14 work together. Drive motor 5 transmits power to sun gear 9 (S3), causing it to rotate clockwise. This rotation, in turn, drives planetary gear 12 (P2) clockwise via planetary short gear 13 (P3). Planetary long gear 12 then drives external ring gear 16 clockwise. External ring gear 16 is connected to the drive wheel via the output shaft, outputting power as in gear 1. This prevents the Ravina planetary carrier 10 from rotating counterclockwise. The Ravina planetary carrier 10 is fixed by brake 14 (B1). At this time, drive motor 5 provides power output, transmitting power via sun gear 9, planetary short gear 13, and planetary long gear 12 to external ring gear 16 and output shaft drive gear 17. Output shaft drive gear 17 connects to output shaft driven gear 18 to form a first-order speed ratio. This power is transmitted to the differential 20 via front drive shaft 19, and then to the half-shaft flange 21, which connects to the vehicle's half-shaft, thus transmitting power to the wheels.

[0018] EV2 mode: Drive motor 5 and brake 15 work together. Drive motor 5 transmits power to sun gear 9 (S3), causing it to rotate clockwise. This rotation, via short planetary gear 13 (P3), drives long planetary gear 12 (P2) to rotate clockwise. Brake 15 (B2) is engaged, and sun gear 11 (S2) remains stationary. While rotating clockwise, long planetary gear 12 (P2) also revolves clockwise, causing the external gear ring 16 and output shaft to rotate clockwise at a relatively high speed. Power from drive motor 5 is then transmitted through sun gear 9 (S3), short planetary gear 13 (P3), and long planetary gear 12 (P2) to the external gear ring 16 and output shaft drive gear 17. Output shaft drive gear 17 connects to driven gear 18 to form a single-speed ratio. This speed is transmitted via front drive shaft 19 to differential 20, and then to half-shaft flange 21, which connects to the vehicle's half-shaft, thus transmitting power to the wheels.

[0019] Range-extended power generation: Wet clutch C1 4 engages, brakes B1 14 and B2 15 disengage, wet clutch C1 4 connects to motor driven gear 7, and motor driven gear 7 is connected to drive motor 5 through motor drive gear 6. At this time, the speed ratio is the reciprocal of i1. Drive motor 5 generates electricity under the drive of engine 1. At the same time, the planetary gear set is in a free state, and power cannot be transmitted to the wheels through the external gear ring 16.

[0020] Series drive: Wet clutch C1 engages (4), brakes B1 (14) and B2 (15) disengage. Wet clutch C1 (4) connects to the driven gear 7 of the motor. The driven gear 7 is connected to the drive motor 5 via the drive gear 6, forming a speed ratio that is the reciprocal of i1. Drive motor 5 generates electricity under the drive of engine 1. Simultaneously, the planetary gear set is in a free state, and power cannot be transmitted to the wheels through the external gear ring 16. However, the entire vehicle is driven by motor P4, with electrical energy derived from the battery and generated by drive motor 5.

[0021] Parallel drive: In parallel drive, the drive motor 5 also participates in driving the engine in all four gears. The power transmission routes of the motor's planetary gear system in first, second, and third gears are consistent with the speed ratios of the engine's first three gears. In fourth gear, brake 15 (B2) engages. Drive motor 5 is connected to sun gear 9 (S3), which is equivalent to the transmission route of wet clutch 4 (C1) engaged. Wet clutch 4 (C1) and brake 15 (B2) are engaged, which is equivalent to the transmission route of second gear.

[0022] In this embodiment, the C1 wet clutch 4, C2 wet clutch 4, B1 brake 14, B2 brake 15 and Ravina planetary carrier 10 are combined to form four gears of the engine, and the input shaft is arranged coaxially with the above-mentioned mechanism.

[0023] In this embodiment, the speed ratios of the motor EV1 and EV2 are consistent with the speed ratios of the engine 1 and 2, and the power flow of the Ravina planetary carrier 10 is consistent.

[0024] In this embodiment, the motor drive gear 6, the motor driven gear 7, the output shaft drive gear 17, and the output shaft driven gear 18 are arranged in parallel shafts.

[0025] In this embodiment, the transmission is integrated with the front axle, and the engine power can be transmitted to the front wheels via the hybrid transmission.

[0026] In this embodiment, the hybrid power transmission device can be combined with the P4 hub motor to form a four-wheel drive system.

[0027] Specific Implementation Method Two: This implementation method differs from Specific Implementation Method One in the arrangement position of the B1 brake 14. For example... Figure 2 As shown, the B1 brake 14 is arranged after the C2 wet clutch 3. One end of the B1 brake 14 is connected to the housing, and the other end is connected to the C2 wet clutch 3.

Claims

1. A four-speed, single-motor driven hybrid power transmission device, characterized in that... The device includes an engine, an input shaft, a C2 wet clutch, a C1 wet clutch, a drive motor, a motor drive gear, a motor driven gear, a motor shaft, an S3 sun gear, a Ravina planetary carrier, an S2 long sun gear, a P2 short planetary gear, a P3 long planetary gear, a B1 brake, a B2 brake, an external gear ring, an output shaft drive gear, an output shaft driven gear, a front drive shaft, a differential, and a half-shaft flange, wherein: One end of the input shaft is connected to the engine, and the other end is connected to the C1 wet clutch and the C2 wet clutch; The C2 wet clutch is connected to the Ravina planetary carrier; The C1 wet clutch is connected to the S3 sun gear; The S3 sun gear is connected to the motor shaft; The motor shaft is connected to the motor driven gear via a spline; The motor drive gear is connected to the drive motor via a spline; The motor drive gear is connected to the motor driven gear; One end of the B1 brake is connected to the housing, and the other end is connected to the Ravina planetary carrier; One end of the B2 brake is connected to the housing, and the other end is connected to the S2 long sun gear; One end of the P2 short planetary gear is connected to the S2 long sun gear, and the other end is connected to the P3 long planetary gear; One end of the external gear ring is connected to the P3 long planetary gear, and the other end is connected to the output shaft drive gear through a spline; The output shaft drive gear and the output shaft driven gear are connected; The driven gear of the output shaft is connected to the front drive shaft; The front drive shaft is connected to the differential; The half-shaft flange is connected to the half-shaft gear of the differential via a spline; The differential is connected to the vehicle's half-shaft via a half-shaft flange, and power is transmitted to the wheels. The device achieves four engine gears, EV gear, and parallel mode through different combinations of C1 wet clutch, C2 wet clutch, B1 brake, and B2 brake. The specific operating method is as follows: 1st gear: C1 wet clutch and B1 brake work together; 2nd gear: C1 wet clutch and B2 brake work together; 3rd gear: C2 wet clutch and C1 wet clutch work together; 4th gear: C2 wet clutch and B2 brake work together; EV1 mode: The drive motor and B1 brake work together; EV2 mode: The drive motor and B2 brake work together; Range extender generator: C1 wet clutch engages, B1 brake and B2 brake disengage; Series drive: C1 wet clutch is engaged, B1 brake and B2 brake are disengaged; Parallel drive: In parallel drive, the drive motor also participates in driving in the four gears of the engine.

2. The four-speed, single-motor driven hybrid power transmission device according to claim 1, characterized in that... The C1 wet clutch, C2 wet clutch, B1 brake, and B2 brake, together with the Ravina planetary carrier, form four gears for the engine. The input shaft is coaxially arranged with the C1 wet clutch, C2 wet clutch, B1 brake, and B2 brake.

3. The four-speed, single-motor driven hybrid power transmission device according to claim 1, characterized in that... The gear ratios of EV1 and EV2 are the same as those of the engine's 1st and 2nd gears, and the power flow of the Ravina planetary carrier is consistent.

4. The four-speed, single-motor driven hybrid power transmission device according to claim 1, characterized in that... The motor drive gear, motor driven gear, output shaft drive gear, and output shaft driven gear are arranged in parallel shafts.

5. The four-speed, single-motor driven hybrid power transmission device according to claim 1, characterized in that... The hybrid powertrain works in conjunction with the P4 wheel hub motor to form a four-wheel drive system.

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