Power transmission system and vehicle comprising the same

• US 9,889,734 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 Dinh
• Application Number:
  US14/755,695
• Publication Number:
  US 20160207391A1
• 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 6/40 characterised by the assembly or relative disposition of components
• 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 2003/0822 characterised by the arrangement of at least one reverse gear
• 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, 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 generator gear fixed on one of the output shafts; a reverse output gear configured to rotate together with or to disengage from a shift driving gear; an output idler gear configured to engage with one of the output shafts so as to rotate together with the output shaft or disengage from the output shaft so as to rotate with the output shaft at different speeds; a motor power shaft configured to rotate together with the generator gear; and a first motor generator configured to rotate together with the motor power shaft. 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 having a shift driving gear thereon;

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

a generator gear fixed on one of the output shafts;

a reverse output gear configured to rotate together with or to disengage from a shift driving gear;

an output idler gear, wherein the output idler gear is configured to engage with one of the output shafts so as to rotate together with the output shaft or to disengage from one of the output shafts so as to rotate with the output shaft at a different speed;

a motor power shaft, wherein the motor power shaft is configured to rotate together with the generator gear;

a motor power shaft gear fixed on the motor power shaft and configured to mesh with the generator gear; and

a first motor generator configured to rotate together with the motor power shaft.

2. The power transmission system according to claim 1, further comprising an output idler gear synchronizer configured to synchronize the output idler gear with one of the output shafts.

3. The power transmission system according to claim 2, wherein the output idler gear synchronizer is disposed on one of the output shafts and configured to engage with the output idler gear.

4. The power transmission system according to claim 2, wherein the output idler gear is fitted over one of the output shafts.

5. The power transmission system according to claim 2, further comprising a reverse idler gear configured to rotate together with a shift rotating gear;

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

6. The power transmission system according to claim 5, further comprising a reverse synchronizer configured to synchronize the reverse output gear with the reverse idler gear.

7. The power transmission system according to claim 6,

wherein the reverse synchronizer and the output idler gear synchronizer are configured to share a shift fork mechanism;

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

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

8. The power transmission system according to claim 6, wherein the reverse idler gear comprises:

a first reverse idler gear configured to mesh with a 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.

9. The power transmission system according to claim 8,

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.

10. The power transmission system according to claim 8,

wherein the reverse output gear and the third reverse output gear are configured to fit over the motor power shaft;

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

11. The power transmission system according to claim 8, wherein the first reverse idler gear and the second reverse idler gear are configured to form as an integrated joint gear structure.

12. The power transmission system according to claim 1, further comprising a fixed-output gear configured to be fixed on other output shafts.

13. The power transmission system according to claim 12, wherein the fixed-output gear and the reverse output gear are configured to mesh with a shift driven gear of a main reducer.

14. The power transmission system according to claim 7,

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; and

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.

15. The power transmission system according to claim 14,

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.

16. The power transmission system according to claim 15,

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 idler gear is fitted over the second output shaft.

17. The power transmission system according to claim 14, 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 shaft to cause the first motor generator to generate electric power.

18. The power transmission system according to claim 14, wherein the engine is configured to transmit power to the generator gear, and to transmit the power to the first motor generator to drive the first motor generator to generate electric power, when the vehicle is in a parking state.

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

19. A power transmission system, comprising:

a dual clutch comprising;

an input terminal;

a first output terminal; and

a second output terminal;

an engine connected with the input terminal;

a first input shaft connected with the first output terminal;

a second input shaft fitter over the first input shaft and connected with the second output terminal, wherein each of the of the input shafts is provided with a shift driving gear;

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

a fixed output gear fixed on the first output shaft;

an output idler gear fitted over the second output shaft;

an output idler gear synchronizer fitted over the second output shaft and configured to engage with the output idler gear;

a generator gear fixed on the second output shaft;

a motor power shaft;

a reverse output gear fitted over the motor power shaft;

a motor power shaft gear fixed on the motor power shaft and configured to mesh with the generator gear;

a first reverse idler gear configured to mesh with a shift driving gear and fitted over a second reverse idler gear, wherein the first reverse idler gear and the second reverse idler gear are formed as an integrated structure;

a third reverse idler gear fitted over the motor power shaft and configured to mesh with second reverse idler gear;

a reverse synchronizer disposed on one of the third reverse idler gear and the reverse output gear and configured to mesh with the other; and

a first motor generator configured to mesh with the motor power shaft.