Power transmission system and vehicle comprising the same

Patent metadata

Field	Value
Publication number	US-9568066-B2
Application number	US-201514644943-A
Country	US
Kind code	B2
Filing date	Mar 11, 2015
Priority date	Sep 10, 2014
Publication date	Feb 14, 2017
Grant date	Feb 14, 2017

Abstract

A power transmission system for a vehicle includes: an engine; a plurality of input shafts, wherein at least one of the input shafts is configured to selectively engage with the engine; a plurality of output shafts configured to mesh with a corresponding shift driving gear; a transmission gear provided on one of the output shafts; a motor power shaft; a first and a second motor gears fitted over the motor power shaft; a motor synchronizer; a reverse gear fitted over the motor power shaft; a middle idler configured to mesh with the shift driving gear provided on one of the input shafts; a reverse idler gear configured to mesh with the reverse gear and to selectively rotate together with the middle idler; and a first motor generator configured to operate correspondingly with the motor power shaft. 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, wherein at least one of the input shafts is 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, wherein each of the output shafts is provided with a shift driven gear configured to mesh with a corresponding shift driving gear;
a transmission gear provided on one of the output shafts;
a motor power shaft;
a first motor gear and a second motor gear both fitted over the motor power shaft;
a motor synchronizer disposed on the motor power shaft and between the first and second motor gears;
a reverse gear fitted over the motor power shaft;
a middle idler configured to mesh with the shift driving gear provided on one of the input shafts;
a reverse idler gear configured to mesh with the reverse gear and to selectively rotate together with the middle idler, wherein the first motor gear is configured to mesh with the middle idler, and the second gear is configured to mesh with the transmission gear; and
a first motor generator configured to operate together with the motor power shaft.

2. The power transmission system according to claim 1 , further comprising a reverse synchronizer configured to synchronize the middle idler and the reverse idler gear.

3. The power transmission system according to claim 1 , wherein the reverse idler gear comprises a gear sleeve, and the middle idler is fitted over the gear sleeve.

4. The power transmission system according to claim 3 , wherein the reverse synchronizer is disposed on the gear sleeve and configured to engage with the middle idler, and/or the reverse synchronizer is disposed on the middle idler and configured to engage with the gear sleeve or with the reverse idler gear.

5. The power transmission system according to claim 1 , wherein the plurality of input shafts comprises 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 parallel to respectively the first and second input shafts; wherein the power transmission system further comprises a dual clutch comprising: an input terminal connected with the engine, a first output terminal coupled with the first input shaft, and a second output shaft coupled with the second input shaft.

6. The power transmission system according to claim 5 , wherein the plurality of shift driving gears comprise 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 comprise 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 second-gear driven gear and the fourth-gear driven gear, and a fifth gear synchronizer disposed at a side of the fifth-gear driven gear.

7. The power transmission system according to claim 6 , wherein the reverse idler gear is fitted over the second output shaft, wherein the middle idler is configured to mesh with the second-gear driving gear, and wherein the transmission gear is fixed on the second output shaft.

8. The power transmission system according to claim 6 , wherein the reverse synchronizer and the fifth gear synchronizer share a shift fork mechanism.

9. The power transmission system according to claim 1 , wherein the reverse gear is a duplex gear comprising a first part configured to mesh with the reverse idler gear and a second part configured to mesh with a driven gear of a main reducer of the vehicle.

10. The power transmission system according to claim 9 , 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 and second output gears are both configured to mesh with the driven gear of the main reducer.

11. The power transmission system according to claim 5 , wherein the engine is configured to engage the input terminal of the dual clutch with the first output terminal and the second output terminal of the dual clutch simultaneously to transmit a first part of power to one or more wheels of the vehicle via one of the output shafts, and to transmit a second part of power to the first motor generator via the motor power shaft to cause the first motor generator to generate electric power.

12. The power transmission system according to claim 1 , wherein the engine is configured to transmit power to one of the input shafts, and to transmit the power to the first motor generator; wherein the motor synchronizer disposed on the motor power shaft is configured to synchronize with the first gear to cause the first motor generator to generate electric power, when the vehicle is in a parking state.

13. The power transmission system according to claim 5 , wherein the vehicle includes a mechanical reverse mode, an electric reverse mode and a hybrid reverse mode, wherein:
when the vehicle is 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 synchronization of the reverse synchronizer;
when the vehicle is in an electric reverse mode, the first motor generator is configured to generate a second power and to transmit the second power to the reverse gear via synchronization of the reverse synchronizer and via synchronizing the first motor gear by the motor synchronizer disposed on the motor power shaft; and
when the vehicle is in a hybrid 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 synchronization of the reverse synchronizer, and the first motor generator is configured to generate a second power and to transmit the second power the reverse gear via synchronization of the reverse synchronizer and via synchronizing the first motor gear by the motor synchronizer disposed on the motor power shaft.

14. 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 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 synchronization of the reverse synchronizer;
when the vehicle is in an electric reverse mode, the first motor generator is configured to generate a second power and to output the second power from the second output shaft via synchronizing the second gear by the motor synchronizer disposed on the motor power shaft; and
when the vehicle is in a hybrid 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 synchronization of the reverse synchronizer, and the first motor generator is configured to generate a second power and to output the second power from the seco

Assignees

• Byd Co Ltd

Inventors

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

Classifications

• B60K7/0007

  the motor being electric · CPC title

• F16H2003/0822

  characterised by the arrangement of at least one reverse gear · CPC title

• F16H2200/0056

  the gear ratios comprising seven forward speeds · CPC title

• B60K17/356

  having fluid or electric motor, for driving one or more wheels · CPC title

• B60K2007/0046

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