MULTY-STAGE TRANSMISSION FOR VEHICLE

The present invention relates to a technology capable of improving fuel efficiency of a vehicle by implementing as many shifting stages as possible with as few components as possible and in as straightforward a configuration as possible. A multi-stage transmission for a vehicle includes: an input shaft and an output shaft; a first planetary gear set, a second planetary gear set, a third planetary gear set, and a fourth planetary gear set provided between the input shaft and the output shaft to transfer a torque, each of the first to fourth planetary gear sets including three rotating elements; and six shifting elements connected to the rotating elements of the first, second, third and fourth planetary gear sets. A first rotating element of the first planetary gear set is fixedly connected to a first rotating element of the second planetary gear set, intermittently connected to a second rotating element of the first planetary gear set, and fixedly installed in a transmission case by one of transmission elements. The second rotating element of the first planetary gear set is fixedly connected to a first rotating element of the third planetary gear set and intermittently connected to the input shaft. A third rotating element of the first planetary gear set is intermittently connected to a second rotating element of the fourth planetary gear set and fixedly connected to a third rotating element of the fourth planetary gear set. 본 발명은 입력축 및 출력축과; 상기 입력축과 출력축 사이에 회전력을 전달할 수 있도록 구비되고, 각각 3개의 회전요소를 구비한 제1유성기어장치, 제2유성기어장치, 제3유성기어장치 및 제4유성기어장치와; 상기 유성기어장치들의 회전요소에 연결되는 6개의 변속요소를 포함하여 구성되며; 상기 제1유성기어장치의 제1회전요소는 상기 제2유성기어장치의 제1회전요소와 상시 연결됨과 아울러 제1유성기어장치의 제2회전요소에 단속 가능하게 설치되고 상기 변속요소들 중 하나에 의해 변속기케이스에 고정 가능하게 설치되며, 제2회전요소는 상기 제3유성기어장치의 제1회전요소와 상시 연결됨과 아울러 상기 입력축에 단속 가능하게 설치되고, 제3회전요소는 상기 제4유성기어장치의 제2회전요소에 단속 가능하게 설치됨과 아울러 제4유성기어장치의 제3회전요소에 상시 연결된 구성이다.