Patent ID: 6764426
Filing Date: 2004-07-20
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 first member of said third planetary gear set and with said output shaft; a third interconnecting member continuously interconnecting said second member of said third planetary gear set with said fist member of said fourth planetary gear set; a first input clutch selectively interconnecting said input shaft with said second member of said second planetary gear set; a second input clutch selectively interconnecting said input shaft with said third member of said third planetary gear set; a first torque-transmitting mechanism selectively interconnecting said second member of said second planetary gear set with said third member of said first planetary gear set; a second torque-transmitting mechanism selectively interconnecting said third member of said second planetary gear set with a member of said first planetary gear set; a third torque-transmitting mechanism selectively interconnecting said second or third member of said first or second planetary gear set with another member of said first or second planetary gear set; fourth and fifth torque-transmitting mechanisms selectively interconnecting said first member of said third planetary gear set with said second and third members of said fourth planetary gear set, respectively; sixth and seventh torque-transmitting mechanisms selectively interconnecting said first and third members of said first planetary gear set, receptively, with a stationary member, and eighth and ninth torque-transmitting mechanisms selectively interconnecting said second and third members of said fourth planetary gear set, respectively, 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.