Four speed ratio transaxle having disengageable overrunning brake for reverse drive gearset reaction.

摘要

A transaxle for use in an automotive vehicle driveline include a torque converter (10) and a compound planetary gear system having two simple planetary gear units adapted to provide four forward driving torque delivery paths, the highest speed ratio torque delivery path being an overdrive, the axis of the converter (10) being located on the crankshaft axis (15) of the vehicle engine and the torque output shaft axis (34,35) being parallel to the converter axis. Clutches and brakes including overrunning clutches and friction clutches in series relationship. A disengageable overrunning brake (92) provides a reverse drive reaction force for the gearset. A mircoprocessor (110) produces a control signal when operation in reverse drive is desired. The signal produces a responsive actuation force applied to the disengageable brake (92) causing the brake to connect a gearset member to the transmission casing. <IMAGE>