Patent ID: 7037233
Filing Date: 2006-05-02
Classification: F16H

Abstract:
1. An automatic transmission, comprising: an input member; an output member; an auxiliary shift portion including a third planetary gear set having a sun gear, a carrier and a ring gear, a first one of which is coupled to the input member, a second one of which is selectively inhibited from rotating by a third brake, and a third one of which serves as an intermediate output member and is rotated at a reduced speed as compared with that of the input member to output power; and a main shift portion including a first planetary gear set and a second planetary gear set each of which includes a sun gear, a carrier and a ring gear, at least one of the sun gear, the carrier and the ring gear of the first planetary gear set being coupled to at least one of the sun gear, the carrier and the ring gear of the second planetary gear set to provide a first rotating element, a second rotating element, a third rotating element and a fourth rotating element, the main shift portion further including a first brake that selectively stops rotation of the first rotating element, a second brake that selectively stops rotation of the second rotating element, a first clutch that selectively couples the first rotating element to the input member, and a second clutch that selectively couples the second rotating element to the input member, the fourth rotating element being coupled integrally to the intermediate output member, the third rotating element being coupled integrally to the output member, wherein: the first planetary gear set is of a single pinion planetary gear; the second planetary gear set is of a double pinion planetary gear; the first rotating element is the sun gear of the first planetary gear set; the second rotating element is the carrier of the first planetary gear set and the carrier of the second planetary gear set that are coupled to each other; the third rotating element is the ring gear of the first planetary gear set and the ring gear of the second planetary gear set that are coupled to each other; and the fourth rotating element is the sun gear of the second planetary gear set.