POWER TRANSMISSION SYSTEM OF HYBRID ELECTRIC VEHICLE

The invention relates to a power transmission system of a hybrid electric vehicle. The power transmission apparatus of a hybrid electric vehicle may include an input shaft receiving an engine torque output from an engine, an output shaft disposed at a same axis with the input shaft and outputting a shifted torque, first and second motor/generators, a first shifting section including a first planetary gear set, outputting a rotation speed from the input shaft as inputted or increased, or forming an adjusted torque from the engine torque and torques of the first and second motor/generators, andoutputting the adjusted torque, and a second shifting section including a compound planetary gear set formed as a combination of second and third planetary gear sets and outputting a shifted torque atleast three stages from a torque received from the first shifting section to the output shaft. 本发明涉及混合动力电动车辆的动力传递系统。混合动力电动车辆的动力传递装置可以包括：输入轴，其接收从发动机输出的发动机扭矩；输出轴，其与输入轴设置在同一轴线上并输出改变的扭矩；第一电动机/发电动机和第二电动机/发电动机；第一变速部分，其包括第一行星齿轮组，原样或