Patent ID: 8574113

Claim:
A transmission comprising: an input shaft; an output shaft; a transmission case; and first, second, third, and fourth simple planetary gear sets, each simple planetary gear set having a sun gear, a planet carrier, a ring gear, and a plurality of planet gears supported for rotation relative to the planet carrier and in continuous meshing engagement with both the sun gear and the ring gear wherein the input shaft is fixedly coupled to the second planet carrier and selectively coupled to the fourth sun gear; the output shaft is fixedly coupled to the fourth planet carrier and coupled to the third planet carrier; the second sun gear is selectively coupled to the transmission case and coupled to the first sun gear; the first ring gear is coupled to the transmission case; the fourth ring gear is coupled to the first planet carrier and selectively directly coupled to the second ring gear; the second ring gear is coupled to the third sun gear and selectively coupled to the fourth sun gear; and the third ring gear is coupled to the fourth sun gear.