Patent ID: 9670993
Date: 2017-06-06
CPC Classifications: F16H

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