Power transmission system for vehicle and vehicle comprising the same

• US 9,568,082 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:
  US14/527,496
• Publication Number:
  US 20150211616A1
• Time in Patent Office: 839 Days
• Field of Search: 743/30, 743/31, 743/33, 743/40
• 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 6/52 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 10/62 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, input shafts to receive power from the engine unit, an output shaft configured to transfer the power from the input shafts, linked gears rotatable differentially relative to the output shaft and configured to mesh with driving gears on the input shafts, an output unit fixed on the output shaft and configured to transmit the power to the front wheels of the vehicle, a synchronizer disposed on the output shaft and configured to selectively engage with the linked gears, a first motor configurable to perform either direct or indirect power transmission with at least one of the input shafts and the output shaft, and one or more second motor generators configured to drive the rear wheels of the vehicle.

Claims

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

an engine unit;

a plurality of input shafts, wherein the engine unit is configured to selectively engage with one of the input shafts when the engine unit transmits power to the one of the input shafts;

a plurality of driving gears, wherein each of driving gears is disposed respectively on each of the input shafts;

an output shaft configured to transfer the power from the input shafts;

one or more linked gears rotatable at a different speed relative to the output shaft, wherein the linked gears include a plurality of gear parts, the gear parts being configured to mesh with the driving gears on the input shafts;

an output unit coupled on the output shaft and configured to transmit the power to front wheels of the vehicle;

a synchronizer disposed on the output shaft, and configured to be selectively engaged with the linked gear;

a first motor generator configurable to perform power transmission with at least one of the input shafts and the output shaft; and

one or more second motor generators configured to drive one or more rear wheels of the vehicle,

wherein the first motor generator is further configured to adjust the rotating speed of the one or more linked gears to substantially match that of the output shaft.

2. The power transmission system according to claim 1, wherein the plurality of input shafts are coaxial and fitted over one another sequentially, and the driving gears are fixed on the input shafts respectively.

3. The power transmission system according to claim 1, wherein the plurality of input shafts comprise:

a first input shaft;

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

two driving gears fixed on the first input shaft and the second input shaft respectively;

wherein the one or more linked gears comprise a double-linked gear, the double-linked gear comprising a first gear part and a second gear part, wherein the first gear part and the second gear part are configured to mesh with the two driving gears respectively.

4. The power transmission system according to claim 3, further comprising a dual clutch, the dual clutch including:

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.

5. The power transmission system according to claim 4, wherein the first motor generator includes an output terminal directly or indirectly coupled with one or more of the driving gears for power transmission.

6. The power transmission system according to claim 1, further comprising an engagement gear ring, the engagement gear ring being fixed on a side facing the synchronizer, and wherein the synchronizer is adapted to engage with the engagement gear ring.

7. The power transmission system according to claim 1, wherein the plurality of input shafts comprise:

a first input shaft;

a second input shaft fitted over the first input shaft;

a third input shaft fitted over the second input shaft; and

three driving gears are disposed on the first, second and third input shafts respectively;

wherein the one or more linked gears comprise a triple-linked gear, the triple-linked gear comprising a first gear part, a second gear part and a third gear part, wherein the first gear part, the second gear part and the third gear part are configured to mesh with the three driving gears respectively.

8. The power transmission system according to claim 7, further comprising a triple clutch, the triple clutch including:

an input terminal coupled with the engine unit;

a first output terminal coupled with the first input shaft;

a second output terminal coupled with the second input shaft; and

a third output terminal coupled with the third input shaft.

9. The power transmission system according to claim 1, wherein the plurality of input shafts comprise:

a first input shaft;

a second input shaft fitted over the first input shaft;

a third input shaft fitted over the second input shaft;

a fourth input shaft fitted over the third input shaft; and

four driving gears fixed on the first, second, third and fourth input shafts respectively;

wherein the one or more linked gears comprise two linked gears, each linked gear being a double-linked gear comprising a first gear part and a second gear part, each gear part being configured to mesh with each of the four driving gears respectively; and

wherein the synchronizer is disposed between the two linked gears.

10. The power transmission system according to claim 9, further comprising a quadruple clutch comprising:

an input terminal coupled with the engine unit;

a first output terminal coupled with the first input shaft;

a second output terminal coupled with the second input shaft;

a third output terminal coupled with the third input shaft; and

a fourth output terminal coupled with the fourth input shaft.

11. The power transmission system according to claim 1, wherein the one or more second motor generators includes a motor generator configured to drive the rear wheels via a speed changing mechanism.

12. The power transmission system according to claim 1, wherein the one or more linked gears are disposed on the output shaft.

13. The power transmission system according to claim 1, further comprising a differential disposed between the front wheels of the vehicle.

14. The power transmission system according to claim 13, wherein the output unit comprises an output driving gear and an output driven gear meshed with the output driving gear, wherein the output driving gear is disposed on the differential.

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

an engine unit;

a plurality of input shafts, wherein the engine unit is configured to selectively engage with one of the input shafts when the engine unit transmits power to the one of the input shafts;

a plurality of driving gears, wherein each of driving gears is disposed respectively on each of the input shafts;

an output shaft configured to transfer the power from the input shafts;

one or more linked gears rotatable at a different speed relative to the output shaft, wherein the linked gears include a plurality of gear parts, the gear parts being configured to mesh with the driving gears on the input shafts;

an output unit coupled on the output shaft and configured to transmit the power to front wheels of the vehicle;

a synchronizer disposed on the output shaft, and configured to be selectively engaged with the linked gear;

a first motor generator configurable to perform power transmission with at least one of the input shafts and the output shaft;

one or more second motor generators configured to drive one or more rear wheels of the vehicle; and

one or more third motor generators configured to drive at least one of the front wheels.

16. The power transmission system according to claim 15, wherein the one or more second motor generators and the one or more third motor generators are further configured to indirectly adjust the rotating speed of the one or more linked gears to substantially match that of the output shaft.