POWER TRANSMISSION SYSTEM OF HYBRID ELECTRIC VEHICLE

摘要

A power transfer system of a hybrid electric vehicle is disclosed. The power transfer system of a hybrid electric vehicle according to an embodiment of the present invention comprises: an input shaft into which power of an engine is inputted; an output shaft separated from the input shaft by a prescribed gap and arranged in parallel with the input shaft; a planetary gear set which is arranged on the input shaft, wherein a first rotational element among three rotational elements thereof is driven by an electric driving force, a second rotational element is externally engaged with the output shaft as an output element, and a third rotational element is driven by the rotational power of the engine; a first motor/generator arranged on the input shaft and directly connected to the first rotational element of the planetary gear set; a second motor/generator arranged on the input shaft and externally engaged with the output shaft selectively; a first transfer gear selectively connected to the input shaft and directly connected to the second motor/generator; a second transfer gear selectively connected to the input shaft and directly connected to the second rotational element; a variable connection means to selectively connect the first transfer gear to the input shaft or the output shaft; and a variable direct connection means to selectively connect two rotational elements among the three rotational elements of the second planetary gear set.