Patent ID: 7438662

Claim:
A six-speed power train of an automatic transmission for a vehicle comprising: a first planetary gear set, which is a double pinion planetary gear set comprising a first operational element always operating as an input element, a second operational element selectively operating as an output and a fixed element, and a third operational element selectively operating as an input element, an output element, and a fixed element; a second planetary gear set, which is a Ravingneaux type planetary gear set comprising a first operational element selectively operating as an input element, a second operational element always operating as an output element, a third operational element selectively operating as an input element and a fixed element, and a fourth operational element selectively operating as a fixed element; a plurality of clutches disposed between and variably connecting operational elements of the first and second planetary gear sets; and a plurality of brakes variably connecting a transmission housing with one of the fixed elements of the first and second planetary gear sets.