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

摘要

Four planetary gear sets (14,16,18,20) are used. One interconnecting shaft (42) interconnects the ring gear (14C) of first set with the planet carrier (18C) of third set. The second shaft (44) interconnects the sun gears (16B,18B) of second and third sets. The third shaft (46) interconnects the sun gear of third set with the ring gear (20B) of fourth set. Five torque-transmitting clutches are engageable to the gears, carriers and transmission housing (50) in combinations of three to establish eight forward speed ratios and one reverse speed ratio between input shaft (12) and output shaft (22).