Patent ID: 6743139
Filing Date: 2004-06-01
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, said first member of said fourth planetary gear set and said output shaft; a first input clutch 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 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 that are not continuously connected with the output shaft with a stationary member; seventh and eighth torque-transmitting mechanisms selectively interconnecting said second and third members of said fourth planetary gear set with said stationary member; and a ninth torque-transmitting mechanism selectively interconnecting a member of said first or second planetary gear set with another member of said first or second planetary gear set, with said first input clutch or with said stationary member; 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.