Patent ID: 9416851
Filing Date: 2016-08-16
CPC Classification: F16H

Claim Text:
1. An automatic transmission for a vehicle, comprising: a housing; three planetary gear mechanisms including a first planetary gear mechanism which is a single pinion type planetary gear mechanism, a second planetary gear mechanism which is one of a single pinion type planetary gear mechanism and a double pinion type planetary gear mechanism, and a third planetary gear mechanism which is a single pinion type planetary gear mechanism, the first planetary gear mechanism, the second planetary gear mechanism, and the third planetary gear mechanism being supported by the housing and being coaxial to a rotation axis; a second sun gear, a second carrier, and a second ring gear in an arranged order in a velocity diagram being defined as a first element, a second element, and a third element, respectively, in a case where the single pinion type planetary gear mechanism is applied as the second planetary gear mechanism; the second carrier, the second ring gear, and the second sun gear in an arranged order in a velocity diagram being defined as the first element, the second element, and the third element, respectively, in a case where the double pinion type planetary gear mechanism is applied as the second planetary gear mechanism; a first ring gear of the first planetary gear mechanism and a third sun gear of the third planetary gear mechanism being connected to each other, and the first element of the second planetary gear mechanism and a third ring gear of the third planetary gear mechanism being connected to each other; an input shaft supported by the housing to be rotatable about the rotation axis, the input shaft connected to a first carrier of the first planetary gear mechanism; an output shaft supported by the housing to be rotatable about the rotation axis, the output shaft connected to a third carrier of the third planetary gear mechanism; a first brake selectively fixing a first sun gear of the first planetary gear mechanism to the housing; a second brake selectively fixing the first element and the third ring gear which are connected to each other to the housing; a first clutch selectively connecting the first carrier and the third element; a second clutch selectively connecting the first sun gear and the third element; a third clutch selectively connecting the first ring gear and the second element; and a fourth clutch selectively connecting the second element and the third carrier; wherein the first brake fixes the first sun gear to the housing, the second clutch connects the first sun gear and the third element, and the fourth clutch connects the second element and the third carrier when a reverse speed is established.