Patent ID: 6811512
Filing Date: 2004-11-02
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 a member of said first or second planetary gear set with said first member of said third planetary gear set and said output shaft; said first member of said fourth planetary gear set being continuously connected with a stationary member; a first input clutch continuously 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, 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, or with said first input clutch; fourth, fifth, sixth and seventh torque-transmitting mechanisms selectively interconnecting members of said third planetary gear set with said second or third members of said fourth planetary gear set; eighth and ninth torque-transmitting mechanisms selectively interconnecting members of said first or second planetary gear set, that are not continuously connected with said output shaft, with a 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.