Power transmission system for vehicle and vehicle comprising the same

• US 9,944,165 B2
• Filed: 10/29/2014
• Issued: 04/17/2018
• 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): Knutson, Jacob D
• Application Number:
  US14/527,522
• Publication Number:
  US 20150210153A1
• Time in Patent Office: 1,266 Days
• Field of Search: 74330, 74331, 180 6521, 180 6522, 180 65265, 180233, 477 5, 477 30, 477 36, 477 3, 701 22
• 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 6/547 the transmission being a stepped gearing
• CPC Class Codes: B60K 7/0007 the motor being electric
• CPC Class Codes: F16H 3/006 power being selectively transmitted by either one of the parallel flow paths
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• CPC Class Codes: Y10S 903/919 Stepped shift

Abstract

A power transmission system for a vehicle and a vehicle including the same are provided. The power transmission system includes an engine unit to generate power, input shafts to receive power from the engine unit, an output shaft to transfer the power from the input shafts, linked gears rotatable differentially relative to the output shaft to mesh with driving gears on the input shafts, an output unit coupled on the output shaft to transmit the power to the front wheels of the vehicle, a synchronizer disposed on the output shaft to selectively engage with the linked gears, a first motor generator to perform power transmission with at least one of the input shafts and the output shaft, one or more second motor generators to drive two front wheels of the vehicle, and one or more third motor generators to drive two rear wheels of the vehicle.

Claims

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

an engine unit;

a plurality of input shafts comprising a first input shaft, a second input shaft fitted over the first input shaft, and a third input shaft fitted over the second input, 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 the driving gears is disposed respectively on each of the input shafts, wherein three of the plurality of driving gears disposed on the first, second, and third input shafts respectively;

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 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 of the plurality of driving gears respectively, wherein the first gear part, the second gear part, and the third gear part are linked together;

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 one of the plurality of input shafts via at least one of the one or more linked gears;

a first motor generator configured 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 at least one of the front wheels of the vehicle; and

one or more third motor generators configured to drive two rear wheels of the vehicle, wherein the second motor generators and the third motor generators are wheel-side motors.

2. 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.

3. The power transmission system according to claim 1, 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.

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

a plurality of input shafts comprising 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 a fourth input shaft fitted over the third input shaft, wherein an 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 the driving gears is disposed respectively on each of the input shafts, wherein four of the plurality of driving gears are fixed on the first, second, third, and fourth input shafts respectively;

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 one or more linked gears comprises two linked gears, each linked gear being a double-linked gear comprising a first gear part and a second gear part of the plurality of gear parts, and each gear part being configured to mesh with each of the four driving gears respectively, wherein the first gear part and the second gear part are linked together, and wherein the synchronizer is disposed between the two linked gears;

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 one of the plurality of input shafts via at least some one of the one or more linked gears;

a first motor generator configured 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 at least one of the front wheels of the vehicle; and

one or more third motor generators configured to drive two rear wheels of the vehicle, wherein the second motor generators and the third motor generators are wheel-side motors.

5. The power transmission system according to claim 4, 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.

6. A vehicle, comprising:

two front wheels and two rear wheels; and

a power transmission system, comprising;

an engine unit;

a plurality of at least three input shafts that are coaxial and fitted over one another sequentially, 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;

at least three driving gears disposed respectively on each of the at least three 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 one or more linked gears comprise a triple-linked gear, the triple-linked gear comprising at least three gear parts that are linked together, wherein the at least three gear parts are configured to respectively mesh with the at least three driving gears;

an output unit coupled 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 be selectively engaged with one of the plurality of input shafts via at least one of the one or more linked gears;

a first motor generator configured 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 the two front wheels of the vehicle; and

one or more third motor generators configured to drive the two rear wheels of the vehicle, wherein the second motor generators and the third motor generators are wheel-side motors.