Multi-stage gear drive, particularly automatic gear drive for motor vehicle, has drive shaft, output shaft and four planetary wheel sets, which are arranged in housing

摘要

The multi-stage gear drive has a drive shaft (1), an output shaft (2) and four planetary wheel sets (P1,P2,P3,P4), which are arranged in a housing (G). Rotatable shafts (3-8) and six switching elements are also provided, where switching elements comprise brakes (03,04) and clutches (14,56,68,78), whose selective engagement causes gear transmission ratio between the drive shaft and the output shaft, so that nine forward speed and one reverse speed are realized.