Patent ID: 6752736
Filing Date: 2004-06-22
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; said first member of said first planetary gear set being continuously or selectively connectable with said first member of said second planetary gear set; an 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 with said output shaft; said first member of said fourth planetary gear set being continuously connected with a stationary member; 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 said second member of said third planetary gear set; first, second and third torque-transmitting mechanisms selectively interconnecting members of said first and second planetary gear sets with other members of said first and second planetary gear set; fourth, fifth, sixth and seventh torque-transmitting mechanisms selectively interconnecting members of said third planetary gear set with said second and third members of said fourth planetary gear set; an eighth torque-transmitting mechanism selectively interconnecting a member of said first or second planetary gear set with said stationary member; a ninth torque-transmitting mechanism selectively interconnecting a member of said first planetary gear set with a member of said second planetary gear set, or selectively interconnecting another member of said first or second planetary gear member 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.