Patent ID: 6736751
Filing Date: 2004-05-18
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, said first member of said fourth planetary gear set and said output shift; 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 second planetary gear set with a member of said first planetary gear set; a second torque-transmitting mechanism selectively interconnecting said second member of said first planetary gear set with another member of said first or second planetary gear set; a third torque-transmitting mechanism selectively interconnecting said third member of said third planetary gear set with said second member of said fourth planetary gear set; a fourth torque-transmitting mechanism selectively interconnecting said third member of said third planetary gear set with said third member of said fourth planetary gear set; a fifth torque-transmitting mechanism selectively interconnecting said first or third members of said first planetary gear set with a stationary member; a sixth torque-transmitting mechanism selectively interconnecting said third member of said first or second planetary gear set with said stationary member, said member interconnected with said stationary member by said sixth torque-transmitting mechanism being different from said member interconnected with said stationary member by said fifth torque-transmitting mechanism; a seventh torque-transmitting mechanism selectively interconnecting said second member of said fourth planetary gear set with said stationary member; an eighth torque-transmitting mechanism selectively interconnecting said third member of said fourth planetary gear set 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.