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

One interconnecting shaft (42) interconnects ring gear (14A) of one planetary gear set (14) with transmission housing (50). Second shaft (44) interconnects ring gears (16A,18A) of second and third sets (16,18). Third shaft (46) interconnects sun gears (16C,20C) of second set and fourth set (20). Fourth shaft (48) interconnects carriers (18B,20B) of third and fourth sets. Five torque-transmitting clutches (26,28,30,32,34) engage the gears, carrier and housing in combinations of three to establish eight forward speed ratios and one reverse speed ratio between the input and output shafts (12,22).