Patent ID: 6837823
Filing Date: 2005-01-04
Classification: F16H

Abstract:
1. 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; 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 connected 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 or second planetary gear set with other members of said first or second planetary gear set or with said first input clutch; fourth, fifth and sixth torque-transmitting mechanisms selectively interconnecting members of said third planetary gear set with said second and third members of said fourth planetary gear set; seventh and eighth torque-transmitting mechanisms selectively interconnecting said stationary member with members of said first or second planetary gear set that are not continuously connected with said output shaft or said first input clutch; 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.