Power transmission system and vehicle comprising the same

Patent metadata

Field	Value
Publication number	US-9874266-B2
Application number	US-201514644881-A
Country	US
Kind code	B2
Filing date	Mar 11, 2015
Priority date	Sep 10, 2014
Publication date	Jan 23, 2018
Grant date	Jan 23, 2018

Abstract

A power transmission system for a vehicle is provided. The system comprises an engine, a plurality of input shafts, at least one of the input shafts being configured to selectively engage with the engine, each of the input shafts being provided with a shift driving gear thereon, a plurality of output shafts, each of the output shafts being provided with a shift driven gear configured to mesh with a corresponding shift driving gear, a motor power shaft configured to rotate together with one of the input shafts, and a first motor generator configured to rotate together with the motor power shaft. When the motor power shaft rotates together with the one of the input shafts, the first motor generator uses at least a part of power output by the engine to generate electric power when the vehicle is parking or running. A vehicle including the power transmission system is also provided.

First claim

What is claimed is:

1. A power transmission system for a vehicle, comprising:
an engine;
a plurality of input shafts, at least one of the input shafts being configured to selectively engage with the engine, each of the input shafts being provided with a shift driving gear thereon;
a plurality of output shafts, each of the output shafts being provided with a shift driven gear configured to mesh with a corresponding shift driving gear;
a motor power shaft configured to rotate together with one of the input shafts;
a first motor generator configured to rotate together with the motor power shaft, wherein when the motor power shaft rotates together with the one of the input shafts, the first motor generator uses at least a part of power output by the engine to generate electric power when the vehicle is parking or running;
a reverse gear freely fitted over the motor power shaft; and
a reverse idler gear configured to mesh with the reverse gear, wherein the reverse gear is configured as a duplex gear, the duplex gear comprising a first part meshed with the reverse idler gear and a second part meshed with a driven gear of a main reducer of the vehicle.

2. The power transmission system according to claim 1 , wherein the motor power shaft is configured to rotate together with one of the output shafts, wherein when the motor power shaft rotates together with one of the output shafts, the first motor generator generates power and transmits the power to the one output shaft; and the power transmission system further comprises:
a motor synchronizer disposed on the motor power shaft, wherein the motor power shaft is configured to selectively rotate together with one of the input shafts or one of the output shafts via a synchronization of the motor synchronizer.

3. The power transmission system according to claim 2 , further comprising a first motor gear and a second motor gear, the first motor gear and the second motor gear being freely fitted over the motor power shaft;
wherein the first motor gear is configured to rotate together with one of the input shafts, the second motor gear is configured to rotate together with one of the output shafts, and the motor synchronizer is disposed between the first motor gear and the second motor gear.

4. The power transmission system according to claim 3 , wherein the first motor gear is configured to perform a direct transmission or indirect transmission with the shift driving gear disposed on the one input shaft.

5. The power transmission system according to claim 4 , further comprising a middle idler configured to mesh with the first motor gear and the shift driving gear provided on one of the input shafts respectively.

6. The power transmission system according to claim 5 ,
wherein the reverse idler gear is configured to selectively rotate together with the middle idler.

7. The power transmission system according to claim 6 , further comprising a reverse synchronizer configured to synchronize the middle idler and the reverse idler gear.

8. The power transmission system according to claim 7 , wherein the reverse idler gear comprises a gear sleeve disposed thereon, and the middle idler is freely fitted over the gear sleeve.

9. The power transmission system according to claim 8 , wherein the reverse synchronizer is disposed on the gear sleeve and configured to be engaged with the middle idler, or the reverse synchronizer is disposed on the middle idler and is configured to be engaged with the gear sleeve or with the reverse idler gear.

10. The power transmission system according to claim 7 , wherein both the reverse idler gear and the middle idler are freely fitted over one of the output shafts;
wherein the reverse synchronizer is disposed on the middle idler and is configured to be engaged with the reverse idler gear, or the reverse synchronizer is disposed on the reverse idler gear and is configured to be engaged with the middle idler.

11. The power transmission system according to claim 7 , wherein the vehicle has a mechanical reverse mode, an electric reverse mode and a hybrid reverse mode;
wherein when the vehicle is operated in the mechanical reverse mode, the engine is configured to generate a first power, to transmit the first power to one of the input shafts, and to transmit the first power to the reverse gear via a synchronization of the reverse synchronizer;
wherein when the vehicle is operated in an electric reverse mode, the first motor generator is configured to generate a second power and transmit the second power to the reverse gear via the synchronization of the reverse synchronizer and the synchronization of the motor synchronizer to the first motor gear; and
wherein when the vehicle is operated in a hybrid reverse mode, the engine is configured to generate the first power, to transmit the first power to one of the input shafts, and to transmit the first power to the reverse gear via the synchronization of the reverse synchronizer; and the first motor generator is configured to generate the second power and to transmit the second power the reverse gear via the synchronization of the reverse synchronizer and the synchronization of the motor synchronizer to the first motor gear.

12. 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 output shafts comprises a first output shaft and a second output shaft, the first and second output shafts being disposed parallel to the first and second input shafts;
wherein the power transmission system further comprises:
a dual clutch, wherein the dual clutch defines an input terminal connected with the engine;
a first output terminal connected with the first input shaft; and
a second output shaft connected with the second input shaft.

13. The power transmission system according to claim 12 , 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 with the first output terminal and the second output terminal of the dual clutch simultaneously to drive the vehicle; wherein the engine is further configured to transmit a second part of power to the first motor generator via the motor power shaft to drive the first motor generator to generate electric power.

14. The power transmission system according to claim 12 , wherein the engine is configured to transmit power to one of the input shafts; wherein the engine is further configured to transmit the power to the first motor generator by synchronizing the first motor gear via the motor synchronizer to drive the first motor generator to generate electric power when the vehicle is in a parking state.

15. The power transmission system according to claim 12 , wherein the plurality of shift driving gears comprises 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, and a fifth-gear driving gear disposed on the first input shaft;
wherein the plurality of shift driven gears comprises a first-gear to fourth-gear driven gears disposed on the first output shaft, and a fifth-gear driven gear disposed on the second output shaft;
and wherein the power transmission system further comprise:
a first-third gear synchronizer disposed between the first-gear driven gear and the third-gear driven gear;
a second-fourth synchronizer disposed between the

Assignees

• Byd Co Ltd

Inventors

• Yang Dongsheng
• Lian Yubo
• Zhang Jintao
• Luo Hongbin

Classifications

• Y02T10/6265

  Cross-Sectional Technologies · mapped topic

• B60K2007/0061

  the motor axle being parallel to the wheel axle · CPC title

• F16H3/006 Primary

  power being selectively transmitted by parallel flow paths, e.g. dual clutch transmissions · CPC title

• B60K6/547

  the transmission being a stepped gearing · CPC title

• B60K2007/0046

  the motor moving together with the vehicle body, i.e. moving independently from the wheel axle · CPC title