Patent ID: 7485069

Claim:
A power train of an automatic transmission, comprising: a Ravigneaux planetary gear set having a Ravigneaux ring gear, a Ravigneaux planet carrier, and first and second Ravigneaux sun gears, wherein the Ravigneaux ring gear always acts as an output member; a simple planetary gear set comprising an input member that is fixedly connected to an input shaft, a fixedly connected member that is fixedly connected to the Ravigneaux planet carrier, and a variably connected member that is variably connected to the Ravigneaux ring gear; a first brake for variably stopping the Ravigneaux planet carrier; a second brake for variably stopping the first Ravigneaux sun gear; a first clutch for rotating the simple planetary gear set; a second clutch for variably connecting the second Ravigneaux sun gear to the input shaft; a third clutch for variably connecting the first Ravigneaux sun gear to the input shaft; and a fourth clutch for variably connecting the variably connected member to the Ravigneaux ring gear.