Patent ID: 6679802
Filing Date: 2004-01-20
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; a first interconnecting member continuously interconnecting said first member of said first planetary gear set and said first member of said second planetary gear set; a second interconnecting member continuously interconnecting said second member of said first planetary gear set and 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; said input shaft being continuously interconnected with at least one member of said planetary gear sets, said output shaft being continuously interconnected with said third member of said first or third planetary gear set; a first torque-transmitting mechanism selectively interconnecting a stationary transmission housing with a member of said first planetary gear set; 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 a member of said third planetary gear set; a fifth torque-transmitting mechanism selectively interconnecting a member of said second planetary gear set with a member of said third planetary gear set; a sixth torque-transmitting mechanism selectively interconnecting a member of the first, second or third planetary gear set with another member of said planetary gear sets, said members interconnected with said sixth torque-transmitting mechanism being different from the members interconnected with said first, second, third, fourth and fifth torque-transmitting mechanisms; said members interconnected with said first, second and third torque-transmitting mechanisms being different from the members continuously interconnected with said input shaft and said output shaft; and 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.