Patent ID: 9512902
Filing Date: 2016-12-06
CPC Classification: F16H

Claim Text:
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 each including three rotating elements; and at least six shifting elements connected to the rotating elements of the first to fourth planetary gear devices, wherein a first rotating element of the first planetary gear device is selectively connected to each of a first rotating element and a second rotating element of the second planetary gear device and a third rotating element of the third planetary gear device, a second rotating element of the first planetary gear device is continuously connected to a second rotating element of the third planetary gear device, and a third rotating element of the first planetary gear device is selectively connected to the third rotating element of the third planetary gear device; the first rotating element of the second planetary gear device is fixably installed by one of the shifting elements, the second rotating element of the second planetary gear device is continuously connected to the input shaft, and a third rotating element of the second planetary gear device is continuously connected to a first rotating element of the third planetary gear device; the first rotating element of the third planetary gear device is continuously connected to a first rotating element of the fourth planetary gear device and the second rotating element of the third planetary gear device is continuously connected to a third rotating element of the fourth planetary gear device; and a second rotating element of the fourth planetary gear device is continuously connected to the output shaft and the third rotating element of the fourth planetary gear device is fixably installed by another of the shifting elements.