Patent ID: 6729993
Filing Date: 2004-05-04
Classification: F16H

Abstract:
A family of transmissions wherein each family member comprises:an input shaft; an output shaft; first, second and third planetary gear sets each having first, second and third members; said output shaft being continuously interconnected with a 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 said input shaft with a member of said first, second or third planetary gear set; a second torque-transmitting mechanism selectively interconnecting said input shaft with a member of said first, second or third planetary gear set or said first, second or third interconnecting member; a third torque-transmitting mechanism selectively interconnecting a member of said first, second or third planetary gear set with said input shaft, or another member of said first, second or third planetary gear set; a fourth torque-transmitting mechanism selectively interconnecting a member of said first, second or third planetary gear set or said first, second or third interconnecting member with a stationary member; a fifth torque-transmitting mechanism selectively interconnecting a member of said first, second or third planetary gear set with said stationary member; a sixth torque-transmitting mechanism selectively interconnecting a member of said first, second or third planetary gear set with another member of said first, second or third planetary gear set, or with said-stationary member; and said torque-transmitting mechanisms being engaged in combinations of three to establish at least seven forward speed ratios and a reverse speed ratio between said input shaft and said output shaft.