Patent ID: 6764425
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 second member of said second planetary gear set; a third interconnecting member continuously interconnecting said third member of said second planetary gear set with said first member of said third planetary gear set and said output shaft; a fourth interconnecting member continuously interconnecting said second member of said third planetary gear set with said first member of said fourth planetary gear set; a first input clutch selectively interconnecting said input shaft with said third member of said third planetary gear set; first and second torque-transmitting mechanisms selectively engageable to interconnect said first and third members of said first planetary gear set, respectively, and said input shaft; third and fourth torque-transmitting mechanisms for selectively interconnecting said first member of said third planetary gear set with said second and third members of said fourth planetary gear set, respectively; fifth and sixth torque-transmitting mechanisms for selectively interconnecting two of said members of said first planetary gear set with a stationary member, respectively; 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, said eighth torque-transmitting mechanism selectively interconnecting said third member of said fourth planetary gear set with said stationary member, or said eighth torque-transmitting mechanism selectively interconnecting a member of said first planetary gear set with one of said input shaft or said stationary member; and said first input clutch and torque-transmitting mechanisms being engaged in combinations of at least three to provide at least five forward speed ratios and a reverse speed ratio.