Patent ID: 6716132
Filing Date: 2004-04-06
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 said second member of said first planetary gear set with said second member of said second planetary gear set; a third 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; a fourth interconnecting member continuously interconnecting said second member of said third planetary gear set with said first member of said fourth planetary gear set; a first input clutch connected with said input shaft; a second input clutch selectively interconnecting said input shaft with said third 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 third planetary gear set with members of said fourth planetary gear set; fifth and sixth torque-transmitting mechanisms selectively interconnecting members of said first or second planetary gear set with a stationary member; a seventh torque-transmitting mechanism selectively interconnecting a member of said fourth planetary gear set with said stationary member; an eighth torque-transmitting mechanism selectively interconnecting a member of said first or second planetary gear set with said first input clutch or selectively interconnecting a member of said fourth planetary gear set 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.