Patent ID: 9499039
Filing Date: 2016-11-22
CPC Classification: B60K,F16H,Y02T,Y10S

Claim Text:
1. A power transmission system of a hybrid electric vehicle, comprising: an input shaft input with power of an engine; an output gear disposed on the input shaft without rotation interference; a first planetary gear set disposed on the input shaft while including three rotation elements having a first sun gear, a first planetary carrier, and a first ring gear; a second planetary gear set disposed on a same shaft line as the first planetary gear set while including three rotation elements having a second sun gear, a second planetary carrier, and a second ring gear; a third planetary gear set disposed on a same shaft line as the second planetary gear set while including three rotation elements having a third sun gear, a third planetary carrier, and a third ring gear; a first rotation shaft directly connected to a first motor generator as one of the rotation elements of the first planetary gear set; a second rotation shaft directly connected to the output gear while directly connecting one of the rotation elements of the first planetary gear set other than the rotation elements configuring the first rotation shaft to one of the rotation elements of the second planetary gear set; a third rotation shaft directly connected to the input shaft as one of the rotation elements of the first planetary gear set other than the rotation elements configuring the first and second rotation shafts; a fourth rotation shaft directly connected to a second motor generator while directly connecting one of the rotation elements of the second planetary gear set other than the rotation elements configuring the second rotation shaft to one of the rotation elements of the third planetary gear set; a fifth rotation shaft selectively connected to a transmission housing as one of the rotation elements of the second planetary gear set other than the rotation elements configuring the second and fourth rotation shafts; a sixth rotation shaft continuously connected to the transmission housing as one of the rotation elements of the third planetary gear set other than the rotation elements configuring the fourth rotation shaft; a seventh rotation shaft selectively connected to the third rotation shaft as one of the rotation elements of the third planetary gear set other than the rotation elements configuring the fourth and sixth rotation shafts; and three friction elements configured to selectively connect the respective rotation shafts to each other or selectively connect the respective rotation shafts to the transmission housing.