Patent ID: 8303447
Filing Date: 2012-11-06
Classification: B60K,B60L,F16H,Y02T

Abstract:
1. A power transmission system of a hybrid electric vehicle, comprising: an input shaft adapted to receive a torque of an engine; a first planetary gear set having first, second, and third rotation elements, wherein the first rotation element is directly connected to a first motor/generator and the third rotation element is connected to the input shaft; a second planetary gear set having fourth, fifth, and sixth rotation elements, wherein the fourth rotation element is directly connected to the second rotation element and a second motor/generator, and the fifth rotation element is selectively connected to the first rotation element, an output gear connected to the sixth rotation element of the second planetary gear set; a first clutch adapted to selectively connect the first rotation element of the first planetary gear set with the fifth rotation element of the second planetary gear set; a second clutch adapted to selectively connect two rotation elements among the rotation elements of the first planetary gear set; a first brake interposed between the fifth rotation element of the second planetary gear set and a transmission housing; and a second brake interposed between the fourth rotation element of the second planetary gear set connected to the second motor/generator and the transmission housing, wherein the first planetary gear set is a double pinion planetary gear set having a first sun gear, a first planet carrier, and a first ring gear as rotation elements thereof, wherein the first sun gear is selectively connected to the first ring gear through the second clutch and is selectively connected to the fifth rotation element of the second planetary gear set through the first clutch, the first planet carrier is connected to the second motor/generator, is selectively connected to the transmission housing through the second brake, and is directly connected to the fourth rotation element of the second planetary gear set, and the first ring gear is directly connected to the input shaft.