POWER TRANSMISSION SYSTEM OF HYBRID ELECTRIC VEHICLE

摘要

A power transmission system of hybrid electric vehicle includes an input shaft, counter shaft, an output shaft, first motor/generator, second motor/generator, first planetary gear set, second planetary gear set to selectively externally gear-connect fourth rotation element to third rotation element through counter shaft while being directly connected to counter shaft and to directly connect fifth rotation element to output shaft and selectively connect sixth rotation element to transmission housing, first transfer gear disposed between second rotation element and output shaft, second transfer gear disposed between third rotation element and counter shaft, variable direct connection device to selectively connect two of three rotation elements of second planetary gear set, and variable connection device to selectively connect sixth rotation element to transmission housing or selectively external gear-connect third rotation element to fourth rotation element.

主权项

1. A power transmission system of a hybrid electric vehicle, comprising:
an input shaft configured to be input with power of an engine; a counter shaft configured to be disposed in parallel with the input shaft at a predetermined interval therefrom; an output shaft configured to be disposed on a same shaft line as the counter shaft; a first motor/generator configured to be disposed on the input shaft to be operated as a motor and a generator; a second motor/generator configured to be disposed in parallel with the counter shaft at a predetermined interval therefrom to be externally gear-connected with the counter shaft; a first planetary gear set configured to be disposed on the input shaft to connect a first rotation element to the first motor/generator and externally gear-connect a second rotation element to the output shaft, and directly connect a third rotation element to the input shaft; a second planetary gear set configured to be disposed on the counter shaft to selectively externally gear-connect a fourth rotation element to the third rotation element through the counter shaft while being directly connected to the counter shaft and to directly connect a fifth rotation element to the output shaft and selectively connect a sixth rotation element to a transmission housing; a first transfer gear configured to be disposed between the second rotation element and the output shaft; a second transfer gear configured to be disposed between the third rotation element and the counter shaft; a variable direct connection device configured to selectively connect two of three rotation elements of the second planetary gear set; and a variable connection device configured to selectively connect the sixth rotation element to the transmission housing or selectively external gear-connect the third rotation element to the fourth rotation element.