Power transmission system and vehicle comprising the same

• US 9,889,733 B2
• Filed: 06/30/2015
• Issued: 02/13/2018
• Est. Priority Date: 01/16/2015
• Status: Active Grant

• Current Assignee: BYD Company Limited
• Original Assignee: BYD Company Limited
• Inventors: Yang, Dongsheng, Lian, Yubo, Zhang, Jintao, Luo, Hongbin
• Primary Examiner(s): Ho, Ha D
• Application Number:
  US14/755,629
• Publication Number:
  US 20160207390A1
• Time in Patent Office: 959 Days
• Field of Search: 74330, 74331, 74333, 74340
• CPC Class Codes: B60K 1/02 comprising more than one electric motor
• CPC Class Codes: B60K 17/356 having fluid or electric motor, for driving one or more wheels disposition of motor in, or adjacent to, traction wheel B60K7/00
• CPC Class Codes: B60K 2006/4808 Electric machine connected or connectable to gearbox output shaft
• CPC Class Codes: B60K 6/36 characterised by the transmission gearings
• CPC Class Codes: B60K 6/38 characterised by the driveline clutches shift clutches within the gearing or transmission B60K6/36 , B60K6/54
• CPC Class Codes: B60K 6/448 Electrical distribution type
• CPC Class Codes: B60K 6/48 Parallel type
• CPC Class Codes: B60K 6/52 Driving a plurality of drive axles, e.g. four-wheel drive
• CPC Class Codes: B60K 6/547 the transmission being a stepped gearing
• CPC Class Codes: B60Y 2304/00 Optimising design; Manufacturing; Testing
• CPC Class Codes: B60Y 2400/428 Double clutch arrangements; Dual clutches
• CPC Class Codes: B60Y 2400/70 Gearings
• CPC Class Codes: F16H 2003/0931 each countershaft having an output gear meshing with a single common gear on the output shaft
• CPC Class Codes: F16H 3/006 power being selectively transmitted by either one of the parallel flow paths
• CPC Class Codes: F16H 3/085 with more than one output shaft
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• CPC Class Codes: Y10S 903/909 Gearing
• CPC Class Codes: Y10S 903/912 Drive line clutch
• CPC Class Codes: Y10S 903/919 Stepped shift

Abstract

A power transmission system for a vehicle includes: an engine; input shafts, at least one of which configured to selectively engage with the engine, each of the input shafts being provided with a shift driving gear thereon; output shafts, each of the output shafts being provided with a shift driven gear configured to mesh with a corresponding shift driving gear; a motor power shaft configured to rotate together with one of the output shafts; and a first motor generator configured to rotate together with the motor power shaft, wherein when the motor power shaft is rotated together with one of the output shafts, the first motor generator is configured to generate electric power utilizing at least parts of power generated by the engine while the vehicle in a running state or a parking state. A vehicle including the power transmission system is also provided.

Claims

1. A power transmission system for a vehicle, comprising:

an engine;

a plurality of input shafts, wherein at least one of the input shafts is configured to engage with the engine;

each of the input shafts being provided with a shift driving gear thereon;

a plurality of output shafts, wherein each of the output shafts is provided with a shift driven gear configured to mesh with a corresponding shift driving gear;

a motor power shaft, wherein the motor power shaft is configured to rotate together with one of the output shafts; and

a first motor generator configured to operate together with the motor power shaft;

wherein when the motor power shaft is rotated together with the one of the output shafts, the first motor generator is configured to generate electric power utilizing at least parts of power generated by the engine while a vehicle having the engine is in a running state or a parking state.

2. The power transmission system according to claim 1, further comprising an output unit configured to rotate with the one of the output shafts at a different speed or to engage with the one of the output shafts so as to rotate together with the one of the output shafts.

3. The power transmission system according to claim 2, further comprising an output unit synchronizer configured to synchronize the output unit with the one of the output shafts.

4. The power transmission system according to claim 3, wherein the output unit synchronizer is disposed on the one of the output shafts and configured to engage with the output unit.

5. The power transmission system according to claim 2, wherein the output unit comprises an output idler gear fitted over the one of the output shafts.

6. The power transmission system according to claim 3, wherein the motor power shaft is configured to rotate together with the one of the output shafts via a gear pair.

7. The power transmission system according to claim 6, further comprising a motor power shaft gear configured to fix on the motor power shaft and a generator gear fixed on the one of the output shafts and to mesh with the motor power shaft gear.

8. The power transmission system according to claim 7, further comprising:

a reverse idler gear configured to rotate together with the shift driving gear; and

a reverse output gear configured to selectively rotate together with the reverse idler gear.

9. The power transmission system according to claim 8, further comprising a reverse synchronizer configured to selectively synchronize the reverse output gear with the reverse idler gear.

10. The power transmission system according to claim 9, wherein the reverse synchronizer and the output unit synchronizer are configured to share a shift fork mechanism;

wherein the output unit synchronizer is in a disengaged state when the output unit synchronizer synchronizes the reverse output gear with the reverse idler gear;

wherein the reverse synchronizer is in a disengaged state when the output unit synchronizer synchronizes the output unit with the one of the output shafts.

11. The power transmission system according to claim 9, wherein the reverse idler gear comprises:

a first reverse idler gear configured to mesh with the shift driving gear;

a second reverse idler gear configured to rotate together with the first reverse idler gear;

a third reverse idler gear configured to mesh with the second reverse idler gear;

wherein the reverse synchronizer is configured to selectively synchronize the reverse output gear with the third reverse idler gear.

12. The power transmission system according to claim 11, wherein the reverse output gear is coaxially arranged with the third reverse idler gear;

wherein the reverse synchronizer is disposed on one of the reverse output gear and the third reverse idler gear and to engage with the other.

13. The power transmission system according to claim 12, wherein the reverse output gear and the third reverse output gear are fitted over the motor power shaft;

wherein the reverse synchronizer is disposed on the reverse output gear.

14. The power transmission system according to claim 11, wherein the first reverse idler gear and the second reverse idler gear are formed as an integrated joint gear structure.

15. The power transmission system according to claim 8, further comprising a fixed output gear;

wherein the fixed output gear is fixed on other output shafts.

16. The power transmission system according to claim 15, wherein the output unit, the fixed output gear and the reverse output gear are configured to mesh with the shift driven gear of a main reducer of a vehicle.

17. The power transmission system according to claim 10, wherein the plurality of input shafts comprise a first input shaft and a second input shaft coaxially fitted over the first input shaft;

wherein the plurality of the output shafts comprise a first output shaft and a second output shaft parallel to respectively the first and second input shafts;

wherein the power transmission system further comprises a dual clutch comprising;

an input terminal connected with the engine, a first output terminal coupled with the first input shaft, and a second output terminal coupled with the second input shaft.

18. The power transmission system according to claim 17, wherein the plurality of shift driving gears comprise:

a first-gear driving gear disposed on the first input shaft, a second-gear driving gear disposed on the second input shaft, a third-gear driving gear disposed on the first input shaft, a fourth-gear driving gear disposed on the second input shaft, a fifth-gear driving gear disposed on the first input shaft, and a fourth-sixth-gear driving gear disposed on the second input shaft;

wherein the plurality of shift driven gears comprise;

first-gear to fourth-gear driven gears disposed on the first output shaft, a fifth-gear driven gear and a sixth-gear driven gear disposed on the second output shaft;

wherein a first-third gear synchronizer disposed between the first-gear driven gear and the third-gear driven gear, a second-fourth gear synchronizer disposed between the second-gear driven gear and the fourth-gear driven gear, and a fifth-sixth gear synchronizer disposed between the fifth-gear shift driven gear and the sixth-gear shift driven gear.

19. The power transmission system according to claim 18, wherein the reverse idler gear is configured to mesh with the second-gear shift driving gear;

wherein the generator gear is fixed on the second output shaft;

wherein the output unit is fitted over the second output shaft.

20. The power transmission system according to claim 17, wherein the engine is configured to engage the input terminal of dual clutch with the first output terminal and the second output terminal of the dual clutch simultaneously to transmit a first part of power to one or more wheels via one of the output shafts, and to transmit a second part of power to the first motor generator via the generator gear to cause the first motor generator to generate electric power.

21. A vehicle comprising a power transmission system for a vehicle according to claim 1.