Transmission unit, power transmission system and vehicle comprising the same

• US 9,849,771 B2
• Filed: 06/30/2015
• Issued: 12/26/2017
• Est. Priority Date: 01/16/2015
• Status: Active Grant

• Current Assignee: BYD Company Limited
• Original Assignee: BYD Company Limited
• Inventors: Zhang, Jintao, Hua, Yu, Chai, Lingdao, Mu, Jinhui, Liu, Jing
• Primary Examiner(s): Scott, Jacob S
• Application Number:
  US14/755,775
• Publication Number:
  US 20160207392A1
• Time in Patent Office: 910 Days
• 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 2006/4841 the gear provides shifting between multiple ratios
• CPC Class Codes: B60K 6/36 characterised by the transmission gearings
• CPC Class Codes: B60K 6/365 with the gears having orbital motion
• 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: B60Y 2400/80 Differentials
• 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: F16H 37/0806 with a plurality of driving or driven shafts
• CPC Class Codes: Y02T 10/62 : Hybrid vehicles
• CPC Class Codes: Y10S 903/909 : Gearing
• CPC Class Codes: Y10S 903/911 : with two or more gear sets
• CPC Class Codes: Y10S 903/912 : Drive line clutch
• CPC Class Codes: Y10S 903/915 : Specific drive or transmission adapted for hev

Abstract

A transmission unit includes: input shafts; output shafts configured to transmit with a corresponding input shaft via gears; a reverse output gear fitted over one output shaft; a reverse synchronizer; a reverse shaft configured to rotate together with a input shaft and a reverse output gear; a motor power shaft; a first and a second motor gears fitted over the motor power shaft; the second motor gear configured to rotate together with a shift driven gear; and a motor synchronizer. A power transmission system including the transmission unit and a vehicle including the power transmission system are also provided.

Claims

1. A transmission unit for a vehicle, comprising:

a plurality of input shafts, each of the input shafts having a shift driving gear thereon;

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

a reverse output gear fitted over one of the output shafts;

a reverse synchronizer configured to engage with the reverse output gear;

a reverse shaft configured to rotate together with one of the input shafts and to rotate together with the reserve output gear;

a motor power shaft;

a first motor gear fitted over the motor power shaft;

a second motor gear fitted over the motor power shaft and configured to rotate together with one of the shift driven gears; and

a motor synchronizer disposed on the motor power shaft and between the first and second motor gears.

2. The transmission unit according to claim 1, further comprising:

an idler shaft;

a first idler gear fixed on the idler shaft and configured to mesh with one of the shift driven gears; and

a second idler gear fixed on the idler shaft and configured to mesh with the second motor gear.

3. The transmission unit according to claim 1, further comprising:

an idler shaft; and

a third idler gear fixed on the idler shaft, wherein power of the second motor gear is transmitted to one of the shift driven gears by the third idler gear.

4. The transmission unit according to claim 1, wherein the second motor gear is configured to mesh with one of the shift driven gears directly.

5. The transmission unit according to claim 1, wherein the reverse output gear includes one or two reverse output gears;

wherein one or two reverse idler gears are disposed on the reverse shaft; and

wherein the reverse idler gears are configured to mesh with the corresponding reverse output gears.

6. The transmission unit according to claim 5, wherein each of the reverse output gears is configured to share a shift synchronizer with an adjacent shift driven gear;

wherein the shift synchronizer is configured as the reverse synchronizer.

7. The transmission unit according to claim 6, 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 output shafts comprise a first and a second output shaft.

8. The transmission unit according to claim 4, wherein the plurality of shift driving gears comprise:

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

wherein the plurality of shift driven gears comprise;

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

wherein the power transmission system further comprises 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, a fifth gear synchronizer disposed on a side of the fifth-gear driven gear, and a sixth gear synchronizer disposed on a side of the sixth-gear driven gear.

9. The transmission unit according to claim 7, wherein the plurality of shift driving gears comprise:

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

wherein the plurality of shift driven gears comprise;

a first-gear driven gear fitted over the first output shaft, a second-gear driven gear fitted over the first output shaft, a third-gear driven gear fitted over the second output shaft, a fourth-gear driven gear fitted over the first output shaft, a fifth-gear driven gear fitted over the first output shaft, and a sixth-gear driven gear fitted over the second output shaft; and

wherein the power transmission system further comprises a first-fifth gear synchronizer disposed between the first-gear driven gear and the fifth-gear driven gear, a second-fourth gear synchronizer disposed between the second-gear driven gear and the fourth-gear driven gear, a third gear synchronizer disposed on a side of the third-gear driven gear, and a sixth gear synchronizer disposed on a side of the sixth-gear driven gear.

10. The transmission unit according to claim 9, wherein the distance between the fifth-gear shift driving gear and the engine, the distance between the first-gear shift driving gear and the engine, and the distance between the third-gear shift driving gear and the engine are in order from large to small;

wherein the distance between the third-gear shift driving gear and the engine, the distance between the first-gear shift driving gear and the engine, and the distance between the fifth-gear shift driving gear and the engine are in order from large to small; and

wherein the distance between the first-gear shift driving gear and the engine, the distance between the fifth-gear shift driving gear and the engine, and the distance between the third-gear shift driving gear and the engine are in order from large to small.

11. The transmission unit according to claim 7, further comprising a first output gear fixed on the first output shaft and a second output gear fixed on the second output shaft, wherein the first output gear, the second output gear and the first motor gear are configured to mesh with the driven gear of a main reducer.

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

a transmission unit according to claim 1; and

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

13. The power transmission system according to claim 12, wherein:

the reverse output gear includes one or two reverse output gears;

one or two reverse idler gears are disposed on the reverse shaft;

the reverse idler gears are configured to mesh with the corresponding reverse output gears, and each of the reverse output gears is configured to share a shift synchronizer with an adjacent shift driven gear;

the shift synchronizer is configured as the reverse synchronizer;

the plurality of input shafts comprise a first input shaft and a second input shaft coaxially fitted over the first input shaft;

the plurality of output shafts comprise a first and a second output shaft; and

wherein the power transmission system further comprises;

an engine; and

a dual clutch, wherein the dual clutch comprises;

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

14. The transmission unit according to claim 12, further comprising a third motor gear fixed on the motor power shaft;

wherein the first motor generator is configured to mesh with the third motor gear directly.

15. The transmission unit according to claim 14, further comprising a first generator gear disposed on the motor shaft of the first motor generator, and to perform a transmission with the third motor gear via an idler gear.

16. The transmission unit according to claim 12, wherein the first motor generator is coaxially connected with the motor power shaft.

17. The power transmission system according to claim 13, wherein the engine is configured to transmit power to a shift driven gear rotated together with the second motor gear, and to transmit the power to the first motor generator by synchronizing the second motor gear via a motor synchronizer to drive the first motor generator to generate electric power, when the vehicle is in a parking state.

18. The power transmission system according to claim 13, wherein the vehicle is operable in a mechanical reverse mode, an electric reverse mode and a hybrid reverse mode,

wherein the engine is configured to generate a first power and the first motor generator is configured to generate a second power;

when the vehicle is operated in the mechanical reverse mode, the engine is configured to transmit the first power to the reverse shaft of the transmission unit, and to transmit the first power to the reverse output gear via a synchronization of the reverse synchronizer to one of the reverse output gears;

wherein, when the vehicle is operated in the electric reverse mode, the first motor generator is configured to transmit the second power to the first motor gear via a synchronization of the motor synchronizer to the first motor gear; and

wherein, when the vehicle is operated in the hybrid reverse mode, the engine is configured to transmit the first power to the reverse shaft of the transmission unit, and to transmit the first power to the reverse output gear via the synchronization of the reverse synchronizer to one of the reverse output gears; and

the first motor generator is configured to transmit the second power to the first motor gear via the synchronization of the motor synchronizer to the first motor gear.

19. The power transmission system according to claim 13, wherein the engine is configured to transmit a first part of power to wheels of the vehicle via one of the output shafts by engaging the input terminal of the dual clutch with the first output terminal and the second output terminal of the dual clutch simultaneously to drive the vehicle, and to transmit a second part of power to the first motor generator via the second motor gear to drive the first motor generator to generate electric power.

20. The power transmission system according to claim 13, further comprising a second motor generator, wherein the second motor generator is configured to perform power transmission with a driven gear of a main reducer of the vehicle;

or

wherein the second motor generator is connected with the first output shaft;

or

wherein the second motor generator is connected with the first input shaft;

or

wherein the driven gear of the main reducer is disposed on a differential of the vehicle, and two second motor generators are provided and disposed on two sides of the differential respectively.

21. The power transmission system according to claim 13, wherein the engine and/or the first motor generator is configured to drive a first pair of wheels of the vehicle, and the power transmission system further comprises:

a third motor generator configured to rotate together with one of a second pair of wheels of the vehicle;

a fourth motor generator configured to rotate together with the other of the second pair of wheels of the vehicle,

an antiskid synchronizer configured to selectively synchronize the second pair of wheels,

wherein the first pair of wheels are one pair of front wheels and rear wheels of the vehicle, and the second pair of wheels are the other pair of the front wheels and the rear wheels.

22. The power transmission system according to claim 21, further comprising

a first gear disposed on a first power output shaft corresponding to the third motor generator;

a second gear disposed on a first drive shaft connected with the one of the second pair of wheels corresponding to the third motor generator;

a third gear configured to mesh with the first gear;

a fourth gear coaxially arranged with the third gear and configured to mesh with the second gear and rotate synchronously with the third gear;

a fifth gear disposed on a second power output shaft corresponding to the fourth motor generator;

a sixth gear disposed on a second drive shaft connected with a wheel corresponding to the fourth motor generator;

a seventh gear configured to mesh with the fifth gear;

an eighth gear coaxially arranged with the seventh gear and configured to mesh with the sixth gear and rotate synchronously with the seventh gear,

wherein the antiskid synchronizer is disposed on the first drive shaft and configured to selectively engage with the sixth gear;

or

wherein the antiskid synchronizer is disposed on the first power output shaft corresponding to the third motor generator and is configured to selectively engage with the fifth gear;

or

wherein the third gear and the fourth gear are fixed on a first gear shaft, the seventh gear and the eighth gear are fixed on a second gear shaft, and the antiskid synchronizer is disposed on the first gear shaft and configured to selectively engage with the seventh gear.

23. The power transmission system according to claim 21, wherein the first power output shaft is coaxially connected with a wheel corresponding to the first output shaft, the second power output shaft is coaxially connected with a wheel corresponding to the second output shaft, the antiskid synchronizer is disposed on the first power output shaft and configured to engage with the second power output shaft.

24. A vehicle comprising a power transmission system for a vehicle according to claim 15.