Eight-speed automatic transmission has torque-transmitting devices that are engageable to the gears, planet carriers and transmission housing in combinations of three to establish eight forward speed ratios and one reverse speed ratio

摘要

Four interconnecting shafts are provided where the first shaft interconnects a sun gear and a brake to a transmission housing. The second shaft couples two planet carriers together. The third shaft couples a ring gear to another planet carrier. The fourth shaft interconnects another ring gear and the other two clutches. Five torque-transmitting devices are engageable to the gears, carriers and transmission housing in combinations of three to establish eight forward speed ratios and one reverse speed ratio between the input and output shafts.