Patent ID: 9416852
Filing Date: 2016-08-16
CPC Classification: F16H

Claim Text:
1. An automatic transmission for a vehicle, comprising: a housing; three single pinion type planetary gear mechanisms including a first planetary gear mechanism having a first sun gear, a first ring gear, and a first carrier, a second planetary gear mechanism having a second sun gear, a second ring gear, and a second carrier, and a third planetary gear mechanism having a third sun gear, a third ring gear, and a third carrier, the first ring gear and the third sun gear being connected to each other, the second ring gear and the third carrier being connected to each other, said three single pinion type planetary gear mechanisms being supported by the housing and being coaxial to a rotation axis; an input shaft supported by the housing to be rotatable about the rotation axis, the input shaft connected to the 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 the third carrier of the third planetary gear mechanism; a brake selectively fixing and releasing the first sun gear of the first planetary gear mechanism to and from the housing; a first clutch selectively connecting the first carrier and the second sun gear of the second planetary gear mechanism; a second clutch selectively connecting the first sun gear of the first planetary gear mechanism and the second sun gear of the second planetary gear mechanism; a third clutch selectively connecting the second carrier of the second planetary gear mechanism and the third sun gear of the third planetary gear mechanism; a fourth clutch selectively connecting the third ring gear of the third planetary gear mechanism and the second carrier of the second planetary gear mechanism; and a switching clutch selectively switching positions to a position where the third ring gear is fixed to the housing, a position where the second carrier is fixed to the housing, or a position where the third ring gear and the second carrier are released relative to the housing; wherein when establishing a reverse speed, the first clutch connects the first carrier and the second sun gear, and the switching clutch fixes the second carrier to the housing.