Patent ID: 9090155
Filing Date: 2015-07-28
Classification: B60K,F16H,Y02T,Y10S

Abstract:
1. A power transmission system of a hybrid electric vehicle, comprising: an input shaft receiving a torque of an engine; an output shaft disposed in parallel with the input shaft; a first planetary gear set disposed on the input shaft, and including a first rotation element connected to a first motor/generator, a second rotation element operating as an output element, and a third rotation element directly connected to the input shaft and selectively connected to a second motor/generator; first transfer gearing connected to the second rotation element; a second planetary gear set disposed on the output shaft, and including a fourth rotation element connected to the second motor/generator through second transfer gearing and selectively connected to the third rotation element, a fifth rotation element connected to the second rotation element through the first transfer gear and connected to the output shaft, and a sixth rotation element selectively connected to a transmission housing; a direct-coupling device connecting two rotation elements among selected from the group consisting of the fourth, fifth, and sixth rotation elements of the second planetary gear set; and at least one friction element selectively connecting at least one of the rotation elements to at least one of the first and second transfer gearing or selectively connecting at least one of the rotation elements to the transmission housing, wherein each transfer gearing includes a transfer drive gear and a transfer driven gear engaged with the transfer drive gear.