Patent ID: 9541169
Date: 2017-01-10
CPC Classifications: F16H

Claim:
1. A multi-stage transmission for a vehicle, comprising: an input shaft and an output shaft; first, second, third and fourth planetary gear devices each having three rotating elements disposed between the input shaft and the output shaft to transfer a torque; and at least six shifting elements connected to the rotating elements of the planetary gear devices; wherein a first rotating element of the first planetary gear device is permanently connected to the input shaft and a second rotating element of the third planetary gear device, a second rotating element of the first planetary gear device is installed to be fixable by one shifting element of the at least six shifting elements and variably connected to a first rotating element of the second planetary gear device and a third rotating element of the second planetary gear device, and a third rotating element of the first planetary gear device is permanently connected to a second rotating element of the second planetary gear device; wherein the first rotating element of the second planetary gear device is variably connected to a first rotating element of the third planetary gear device, the second rotating element of the second planetary gear device is variably connected to the first rotating element of the third planetary gear device, and the third rotating element of the second planetary gear device is variably connected to a first rotating element of the fourth planetary gear device; wherein a third rotating element of the third planetary gear device is permanently connected to a second rotating element of the fourth planetary gear device and the output shaft; and wherein a third rotating element of the fourth planetary gear device is permanently fixed.