Patent ID: 6746357
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 another member of said first or second planetary gear set with said first member of said third planetary gear set and with said output shaft; a third interconnecting member continuously interconnecting a member of said third planetary gear set with a member of said fourth planetary gear set; a first input clutch selectively interconnecting said input shaft with a member of said first or said second planetary gear set that is not continuously interconnected with said output shaft; a second input clutch selectively interconnecting said input shaft with a second member of said third planetary gear set; a first, second and third torque-transmitting mechanism selectively interconnecting members of said first or second planetary gear sets with other members of said first or second planetary gear set or with said first input clutch; a fourth and fifth torque-transmitting mechanism selectively interconnecting members of said third planetary gear set with members of said fourth planetary gear set; a sixth torque-transmitting mechanism selectively interconnecting a member of said first or second planetary gear set with a stationary member; a seventh and eighth torque-transmitting mechanism selectively interconnecting members 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.