Patent ID: 9541171
Date: 2017-01-10
CPC Classifications: F16H

Claim:
1. An automatic transmission for a vehicle comprising: an input shaft; an output member; a stationary portion; a first planetary gear set including three rotation elements that are a first sun gear, a first ring gear, and a first pinion carrier, which are respectively defined as a first element, a third element, and a second element; a second planetary gear set which is a Ravigneaux type, and which includes a second sun gear, a third sun gear, a second pinion engaged with the second sun gear, a third pinion engaged with the second pinon and the third sun gear, a second pinion carrier which rotatably supports the second pinion and the third pinion, and a second ring gear engaged with the third pinion; and five frictional engagement elements that are a first clutch, a second clutch, a first brake, a second brake, and a third brake, the input shaft being constantly connected to the second element, the input shaft being connected to the second sun gear by an engagement of the first clutch, and the input shaft being engaged with the third sun gear by an engagement of the second clutch, the output member being constantly connected to the second ring gear, the first element being fixed to the stationary portion by an engagement of the first brake, the third element being constantly connected to the second pinion carrier, and the third element being fixed to the stationary portion by an engagement of the second brake, and the third sun gear being fixed to the stationary portion by an engagement of the third brake.