Patent ID: 6746363
Filing Date: 2004-06-08
Classification: F16H

Abstract:
A multi-speed transmission comprising:an input shaft; an output shaft; first, second, third and fourth planetary gear sets each having first, second and third members; a first interconnecting member continuously interconnecting said first member of said first planetary gear set with said first member of said second planetary gear set; a second interconnecting member continuously interconnecting a member of said first or second planetary gear set with said first member of said third planetary gear set and said output shaft; said first member of said fourth planetary gear set being continuously connected with a stationary member; a first input clutch continuously connected with said input shaft; a second input clutch selectively interconnecting said input shaft with said second member of said third planetary gear set; first and second torque-transmitting mechanisms selectively interconnecting members of said first and second planetary gear sets with said first input clutch; third and fourth torque-transmitting mechanisms selectively interconnecting members of said first and second planetary gear sets with other members of said first or second planetary gear set or with said first input clutch; fifth, sixth, seventh and eighth torque-transmitting mechanisms selectively interconnecting members of said third planetary gear set with said second and third members of said fourth planetary gear set; a ninth torque-transmitting mechanism selectively interconnecting a member of said first or second planetary gear set, that is not continuously connected with said output shaft, with said stationary member; and said input clutches and torque-transmitting mechanisms being engaged in combinations of at least three to provide at least six forward speed ratios and a reverse speed ratio.