Patent ID: 6736749
Filing Date: 2004-05-18
Classification: F16H

Abstract:
A multi-speed-transmission comprising:an input shaft; an output shaft; first, second and third planetary gear sets each having first, second and third members; said input shaft being continuously interconnected with at least one member of said planetary gear sets, said output shaft being continuously interconnected with another member of said planetary gear sets; 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 first member of said third planetary gear set; a third interconnecting member continuously interconnecting said second member of said second planetary gear set with said second member of said third planetary gear set; a first torque-transmitting mechanism selectively interconnecting a stationary transmission housing with a member of said first or second planetary gear sets; a second torque-transmitting mechanism selectively interconnecting said stationary transmission housing with a member of said second planetary gear set; a third torque-transmitting mechanism selectively interconnecting a member of said third planetary gear set with said transmission housing; a fourth torque-transmitting mechanism selectively interconnecting a member of said first planetary gear set with another member of said planetary gear sets; a fifth torque-transmitting mechanism selectively interconnecting a member of said second planetary gear set with another member of said planetary gear sets; and a sixth torque-transmitting mechanism selectively interconnecting a member of said third planetary gear-set with another member of said planetary gear sets or with said transmission housing, said members interconnected by said sixth torque-transmitting mechanism being different from the members interconnected by said first, second, third, fourth and fifth torque-transmitting mechanisms; said members interconnected by said first, second and third torque-transmitting mechanisms being different from the members continuously interconnected with said input shaft and said output shaft; said torque-transmitting mechanisms being engaged in combinations of two to establish at least seven forward speed ratios and a reverse speed ratio between said input shaft and said output shaft.