Patent ID: 6758787
Filing Date: 2004-07-06
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 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 said second member of said first planetary gear set; a second input clutch selectively interconnecting said input shaft with said second member of said third planetary gear set; a first torque-transmitting mechanism selectively interconnecting said third member of said first planetary gear set with said stationary member; a second torque-transmitting mechanism selectively interconnecting said second member of said first planetary gear set with said third member of said second planetary gear set; a third torque-transmitting mechanism selectively interconnecting a member of said first or second planetary gear set with another member of said first or second planetary gear set; a fourth and a fifth torque-transmitting mechanism for selectively interconnecting said second member of said fourth planetary gear set with said first and third members of said third planetary gear set, respectively; a sixth and a seventh torque-transmitting mechanism selectively interconnecting said third member of said fourth planetary gear set with said first and third members of said third planetary gear set, respectively; and an eighth torque-transmitting mechanism selectively interconnecting a member of said second planetary gear set with another member of said second planetary gear set, or 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.