Patent ID: 9435406
Filing Date: 2016-09-06
CPC Classification: F16H

Claim Text:
1. A multi-stage transmission for a vehicle comprising: an input shaft; an output shaft; first, second, third and fourth planetary gear devices disposed between the input shaft and the output shaft to transmit rotary force, each of the first, second, third and fourth planetary gear devices having three rotary elements; and at least six shifting elements connected to the rotary elements of the planetary gear devices, wherein a first rotary element of the first planetary gear device is continuously connected to a third rotary element of the second planetary gear device, a second rotary element of the first planetary gear device is continuously connected to a first rotary element of the third planetary gear device and a third rotary element of the fourth planetary gear set, and a third rotary element of the first planetary gear device is installed to be fixable by a first shifting element of the at least six shifting elements, wherein a first rotary element of the second planetary gear device is selectively connected to a second rotary element of the third planetary gear device, a first rotary element and a second rotary element of the fourth planetary gear device, a second rotary element of the second planetary gear device is continuously connected to the input shaft and selectively connected the first rotary element of the fourth planetary gear device, and the third rotary element of the second planetary gear device is continuously connected to a third rotary element of the third planetary gear device, and wherein the first rotary element of the fourth planetary gear device is installed to be fixable by a second shifting element of the at least six shifting elements and the second rotary element of the fourth planetary gear device is continuously connected to the output shaft.