Transmission assembly with four planetary gear sets providing nine forward and one reverse gear ratio

摘要

A transmission assembly having a first, a second, a third, and a fourth planetary gear set is disclosed. The transmission assembly further includes an input shaft which drives the sun gear of the first planetary gear set, a first member which connects the planet carrier of the third planetary gear set and the ring gear of the fourth planetary gear set, and a second member which connects the sun gear of the third planetary gear set to the sun gear of the fourth planetary gear set. The transmission assembly yet further includes a third member which connects the ring gear of the first planetary gear set to (i) the planet carrier of the second planetary gear set and (ii) the ring gear of the third planetary gear set. The transmission assembly still further includes a fourth member which connects the planet carrier of the first planetary gear set to the sun gear of the second planetary gear set and an output shaft driven the planet carrier of the fourth planetary set. The transmission assembly yet further includes (i) a first clutch between the input shaft and the second member, (ii) a second clutch between the input shaft and the first member, (iii) a third clutch between the fourth member and the housing, (iv) a fourth clutch between the ring gear of the second planetary gear set and the housing, (v) a fifth clutch between the third member and the housing, and (vi) a sixth clutch between the first member and the housing.