Patent ID: 9546711
Date: 2017-01-17
CPC Classifications: F16H

Claim:
1. A multi-stage transmission for a vehicle, comprising: an input shaft and an output shaft; a first planetary gear device, a second planetary gear device, a third planetary gear device, and a fourth planetary gear device provided between the input shaft and the output shaft so as to transfer a torque; and at least six clutches connected to the first to fourth planetary gear devices, wherein a first rotating element of the first planetary gear device is directly connected to a third rotating element of the second planetary gear device, a second rotating element of the first planetary gear device is directly connected to a second rotating element of the third planetary gear device and a third rotating element of the fourth planetary gear device, and a third rotating element of the first planetary gear device is selectively connected to a second rotating element of the second planetary gear device by one of the clutches, a first rotating element of the second planetary gear device is selectively connected to a first rotating element of the fourth planetary gear device by another of the clutches, the second rotating element of the second planetary gear device is directly connected to the input shaft, and the third rotating element of the second planetary gear device is directly connected to a first rotating element of the third planetary gear device, a third rotating element of the third planetary gear device is selectively connected to the first rotating element and a second rotating element of the fourth planetary gear device, and the second rotating element of the fourth planetary gear device is directly connected to the output shaft.