POWER TRANSMISSION SYSTEM OF HYBRID ELECTRIC VEHICLE

摘要

A power transmission system of a hybrid electric vehicle includes: an input shaft; a first shaft; a first planetary assembly on the first shaft, and including a first element connected to a first motor/generator, a second element connected to an output gear through a second shaft without rotational interference with the first shaft, and a third element connected to the input shaft; a second planetary assembly on the first shaft including a fourth element connected to a second motor/generator through the first shaft and selectively connected to the input shaft, a fifth element connected to the second element, and a sixth element selectively connected to a housing; transfer gears; and frictional elements selectively connecting one element of the second planetary assembly to the input shaft, directly coupling the second planetary assembly, or selectively connecting another element of the second planetary assembly to the housing.

主权项

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 an 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 an 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 an 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.