Power transmission apparatus for hybrid electric vehicle

摘要

A transmission for a vehicle may include first and second input shafts, first and second shifting output units, a reverse speed idle unit and an electric driving force unit. Each input shaft may include a plurality of input gears having different numbers of gear teeth. The second input shaft may be hollow and disposed at a front side of the first input shaft without any rotational interference with the first input shaft. Each shifting output unit may include an output shaft, shift rotational driving force transferred through shifting gears selectively outer-engaging with corresponding input gears by a synchronizing unit and output the shifted rotational driving force through an output gear. The reverse speed idle unit may regulate reverse speed shifting. The electric driving force unit may selectively transfer rotational driving force of a motor/generator to the first input shaft or the second shifting output unit.

主权项

1. A transmission for a vehicle, comprising:
a first input shaft which includes a first plurality of input gears each having different number of gear teeth at an outer circumferential side of a rear side of the first input shaft and is selectively connected through a first clutch to an output side of an engine; a second input shaft which includes a second plurality of input gears each having different number of gear teeth at an outer circumferential side of the second input shaft, is a hollow shaft disposed at a front side of the first input shaft without any rotational interference with the first input shaft, and is selectively connected through a second clutch to the output side of the engine; a first shifting output unit which includes a first output shaft disposed substantially in parallel with the first and second input shafts, shifts rotational driving force transferred through shifting gears selectively outer-engaging with corresponding input gears in the first and second pluralities of the input gears by a synchronizing unit and outputs the shifted rotational driving force through a first output gear; a second shifting output unit which includes a second output shaft disposed substantially in parallel with the first and second input shafts, shifts rotational driving force transferred through the shifting gears selectively outer-engaging with corresponding input gears in the first and second pluralities of the input gears by the synchronizing unit and outputs the shifted rotational driving force through a second output gear; a reverse speed idle unit which is disposed between the second input shaft and the second shifting output unit and regulates reverse speed shifting; and an electric driving force unit which is configured to selectively transfer, to the first input shaft or the second shifting output unit, rotational driving force of a motor/generator disposed at a third input shaft which is disposed coaxially with the first input shaft and at the rear side of the first input shaft.