Patent ID: 9631705
Date: 2017-04-25
CPC Classifications: F16H

Claim:
1. A multi-stage automatic transmission for vehicle comprising: first, second, third and fourth planetary gear sets, each including first, second and third rotation elements; friction members including first, second, third and fourth clutches and first and second brakes, wherein an input shaft is connected to the first rotation element of the second planetary gear set and the third rotation element of the fourth planetary gear set, an output shaft is connected to the second rotation element of the fourth planetary gear set, the second rotation element of first planetary gear set is connected to the third rotation element of the second planetary gear set, the third rotation element of the first planetary gear set is connected to the first rotation element of the third planetary gear set, and the first rotation element of the third planetary gear set is connected to the first rotation element of the fourth planetary gear set, and wherein the first brake fixes the first rotation element of the first planetary gear set, the second brake fixes the second rotation element of the second planetary gear set, the first clutch selectively connects the third rotation element of the second planetary gear set and the third rotation element of the third planetary gear set, the second clutch selectively connects the second rotation element of the second planetary gear set and the third rotation element of the third planetary gear set, the third clutch selectively connects the third rotation element of the second planetary gear set and the second rotation element of the third planetary gear set, and the fourth clutch selectively connects the third rotation element of the third planetary gear set and the second rotation element of the fourth planetary gear set.