Planetary gear train of automatic transmission for vehicle

摘要

A planetary gear train may include an input shaft into which power of an engine may be input, a first planetary gear set including a first sun gear, a first planetary carrier, and a first ring gear, a second planetary gear set including a second sun gear, a second planetary carrier, and a second ring gear, a third planetary gear set including a third sun gear, a third planetary carrier, and a third ring gear, and a fourth planetary gear set including a fourth sun gear, a fourth planetary carrier, and a fourth ring gear, and first to eighth rotational shafts.

主权项

1. A planetary gear train of an automatic transmission for a vehicle comprising:
an input shaft into which power of an engine is input; a first planetary gear set including a first sun gear, a first planetary carrier, and a first ring gear; a second planetary gear set including a second sun gear, a second planetary carrier, and a second ring gear; a third planetary gear set including a third sun gear, a third planetary carrier, and a third ring gear; a fourth planetary gear set including a fourth sun gear, a fourth planetary carrier, and a fourth ring gear; a first rotational shaft including the second sun gear and directly connected to the input shaft; a second rotational shaft including the second planet carrier; a third rotational shaft including the first planet carrier and the second ring gear and selectively connected to a transmission housing; a fourth rotational shaft including the first sun gear and selectively connected to the transmission housing or the second rotational shaft; a fifth rotational shaft including the first ring gear and the third ring gear and selectively connected to the second rotational shaft; a sixth rotational shaft including the third planet carrier and the fourth ring gear and selectively connected to the first rotational shaft; a seventh rotational shaft including the fourth planet carrier and directly connected to an output shaft; an eighth rotational shaft including the third sun gear and the fourth sun gear and selectively connected to the first rotational shaft; a first clutch selectively connecting the second rotational shaft with the fourth rotational shaft; a second clutch selectively connecting the second rotational shaft with the fifth rotational shaft; a third clutch selectively connecting the input shaft with the sixth rotational shaft; a fourth clutch selectively connecting the input shaft with the eighth rotational shaft; a first brake selectively connecting the fourth rotational shaft with the transmission housing; and a second brake selectively connecting the third rotational shaft with the transmission housing.