Patent ID: 9623745
Date: 2017-04-18
CPC Classifications: B60K,F16H,Y02T,Y10S

Claim:
1. A power transmission system of a hybrid electric vehicle, the power transmission system comprising: an input shaft to which power from an engine is input; an output shaft spaced apart from the input shaft by a predetermined distance and disposed to be parallel with the input shaft; a planetary gear set including three rotation elements disposed on the input shaft, a first rotation element being driven by electrical driving force, a second rotation element being engaged with the output shaft as an output element, and a third rotation element being driven by rotational power of an engine; a first motor/generator disposed on the input shaft and directly connected to the first rotation element of the planetary gear set; a second motor/generator disposed on the input shaft and selectively engaged with the output shaft; a first transfer gear selectively connected to the input shaft and directly connected to the second motor/generator; a second transfer gear selectively connected to the input shaft and directly connected to the second rotation element; a variable connecting apparatus selectively connecting the first transfer gear to the input shaft or the output shaft; and a variable direct coupling apparatus selectively connecting two rotation elements among the three rotation elements, of the planetary gear set.