Power transmission system for vehicle and vehicle comprising the same

• US 9,568,080 B2
• Filed: 10/29/2014
• Issued: 02/14/2017
• Est. Priority Date: 01/30/2014
• 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:
  US14/526,816
• Publication Number:
  US 20150211614A1
• Time in Patent Office: 839 Days
• Field of Search: 743/30, 743/31, 743/33, 743/40, 746/61
• US Class Current: 1/1
• 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 6/387 Actuated clutches, i.e. clutches engaged or disengaged by electric, hydraulic or mechanical actuating means
• CPC Class Codes: B60K 6/442 Series-parallel switching type
• CPC Class Codes: B60K 6/448 Electrical distribution type
• CPC Class Codes: B60K 6/52 Driving a plurality of drive axles, e.g. four-wheel drive
• CPC Class Codes: B60K 7/0007 the motor being electric
• CPC Class Codes: F16H 37/0806 with a plurality of driving or driven shafts
• CPC Class Codes: Y02T 10/60 Other road transportation technologies with climate change mitigation effect
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• CPC Class Codes: Y10S 903/917 with transmission for changing gear ratio
• CPC Class Codes: Y10T 74/19014 Plural prime movers selectively coupled to common output

Abstract

A power transmission system for a vehicle and a vehicle including the same are provided. The power transmission system includes: an engine unit configured to generate power; a transmission unit adapted to selectively couple with the engine unit, and configured to transmit the power generated by the engine unit; a first motor generator coupled with the transmission unit; an output unit configured to transmit the power output by the transmission unit to at least one of front and rear wheels of the vehicle; a power switching device adapted to enable or interrupt a power transmitting between the transmission unit and the output unit; and a second motor generator configured to drive the at least one of the front and rear wheels.

Claims

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

an engine unit configured to generate power;

a transmission unit adapted to selectively couple with the engine unit, and configured to transmit the power generated by the engine unit;

a first motor generator coupled with the transmission unit;

an output unit configured to transmit the power output by the transmission unit to at least one of front and rear wheels of the vehicle;

a power switching device adapted to enable or interrupt a transmitting of power between the transmission unit and the output unit; and

at least one second motor generator configured to drive the at least one of the front and rear wheels,

wherein the power switching device is configured as a synchronizer adapted to selectively synchronize the output unit with the transmission unit;

wherein the transmission unit comprises;

a transmission power input part selectively engaged with the engine unit to transmit the power generated by the engine unit; and

a transmission power output part configured to output the power from the transmission power input part to the output unit via the synchronizer;

wherein the transmission power input part comprises an input shaft configured to selectively engage with the engine unit, and a driving gear disposed on the input shaft;

wherein the transmission power output part comprises an output shaft, and a driven gear disposed on the output shaft and configured to mesh with the driving gear on the input shaft;

wherein the driven gear is a linked gear rotatable differentially relative to the output shaft; and

wherein the synchronizer is disposed on the output shaft and is configured to selectively engage with the driven gear.

2. The power transmission system according to claim 1, wherein the output unit being rotatable differentially relative to the output shaft, and wherein the synchronizer is configured to selectively engage with the output unit to rotate the output unit synchronously with the output shaft to drive the at least one of the front and rear wheels.

3. The power transmission system according to claim 2, wherein the input shaft comprises a plurality of input shafts, which are coaxial and fitted over one another sequentially, and the engine unit is adapted to selectively engage with one of the plurality of input shafts to transmit power to the one of the plurality of input shafts.

4. The power transmission system according to claim 2, wherein the output unit is configured to drive a first pair of wheels of the vehicle, the first pair of wheels being one pair of a pair of front wheels and a pair of rear wheels, and wherein a pair of second motor generators is provided and is configured to drive the first pair of wheels.

5. The power transmission system according to claim 4, further comprising:

at least one third motor generator configured to drive a second pair of wheels of the vehicle, wherein the second pair of wheels is the other pair of the pair of front wheels and the pair of rear wheels.

6. The power transmission system according to claim 5, further comprising:

a differential disposed between the first pair of wheels and configured to cooperate with the output unit to transmit power.

7. The power transmission system according to claim 6, wherein the pair of second motor generators is disposed on two sides of the differential and is integrally formed with the differential.

8. The power transmission system according to claim 6, wherein each second motor generator is a wheel-side motor.

9. The power transmission system according to claim 4, further comprising:

a differential disposed between the first pair of wheels and configured to cooperate with the output unit to transmit power.

10. The power transmission system according to claim 2, wherein the output unit is configured to drive a first pair of wheels of the vehicle and the second motor generator is configured to drive a second pair of wheels of the vehicle, the first pair of wheels being one of the pair of front wheels and the pair of rear wheels, and the second pair of wheels being the other one of the pair of front wheels and the pair of rear wheels.

11. The power transmission system according to claim 1, wherein the power switching device is configured as a clutch adapted to enable or interrupt the transmitting of power between the transmission unit and the output unit.

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

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

an engine unit configured to generate power;

a transmission unit adapted to selectively couple with the engine unit, and configured to transmit the power generated by the engine unit;

a first motor generator coupled with the transmission unit;

an output unit configured to transmit the power output by the transmission unit to at least one of front and rear wheels of the vehicle;

a power switching device adapted to enable or interrupt a transmitting of power between the transmission unit and the output unit; and

at least one second motor generator configured to drive the at least one of the front and rear wheels;

wherein the power switching device is configured as a synchronizer adapted to selectively synchronize the output unit with the transmission unit;

wherein the transmission unit comprises;

a transmission power input part selectively engaged with the engine unit to transmit the power generated by the engine unit; and

a transmission power output part configured to output the power from the transmission power input part to the output unit via the synchronizer;

wherein the transmission power input part comprises an input shaft configured to selectively engage with the engine unit, and a driving gear disposed on the input shaft;

wherein the transmission power output part comprises an output shaft, and a driven gear disposed on the output shaft and configured to mesh with the driving gear on the input shaft;

wherein the synchronizer is disposed on the output shaft, the output unit being rotatable differentially relative to the output shaft;

wherein the synchronizer is configured to selectively engage with the output unit to rotate the output unit synchronously with the output shaft to drive the at least one of the front and rear wheels;

wherein the input shaft comprises a plurality of input shafts, which are coaxial and fitted over one another sequentially, and the engine unit is adapted to selectively engage with one of the plurality of input shafts to transmit power to the one of the plurality of input shafts; and

wherein one driving gear is fixed on each of the plurality of input shafts, a plurality of driven gears are fixed on the output shaft, and the driven gears are configured to mesh with the driving gears on the plurality of input shafts respectively.

14. The power transmission system according to claim 13, wherein the plurality of the input shafts comprises:

a first input shaft, and a second input shaft fitted over the first input shaft; and

wherein the power transmission system further comprises

a dual clutch comprising;

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