Patent ID: 8905892
Filing Date: 2014-12-09
Classification: B60K,F16H,Y02T,Y10S

Abstract:
1. A power transmission system of a hybrid electric vehicle comprising: an input shaft receiving torque of an engine; a first rotation shaft parallel with the input shaft; a first planetary gear set on the first rotation shaft, and including a first rotation element connected to a first motor/generator through a first externally-meshed gear, a second rotation element connected to an output gear through a second rotation shaft disposed without rotational interference with the first rotation shaft, and a third rotation element connected to the input shaft through a second externally-meshed gear; a second planetary gear set on the first rotation shaft, and including a fourth rotation element connected to a second motor/generator through the first rotation shaft and selectively connected to the input shaft through a third externally-meshed gear, a fifth rotation element connected to the second rotation element, and a sixth rotation element selectively connected to a transmission housing; transfer gears forming the externally-meshed gears, respectively; and frictional elements selectively connecting one rotation element of the second planetary gear set to the input shaft, directly coupling the second planetary gear set, or selectively connecting another rotation element of the second planetary gear set to the transmission housing.