Patent ID: 6659903
Filing Date: 2003-12-09
Classification: F16H

Abstract:
A multi-seed transmissions 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 a member of said planetary gear sets, and 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 and 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 third member of said second planetary gear set being continuously connected with a transmission housing; a first torque-transmitting mechanism selectively interconnecting said second member of said first planetary gear set with a member of said third planetary gear set; a second torque-transmitting mechanism selectively interconnecting a member of said second planetary gear set with a member of said first or third planetary gear set; a third torque-transmitting mechanism selectively interconnecting a member of said third planetary gear set with a member of said first or second planetary gear set; a fourth torque-transmitting mechanism selectively interconnecting a member of said first, or third planetary gear set with another member of said planetary gear set, or with said transmission housing; a fifth torque-transmitting mechanism selectively interconnecting a member of said first, or third planetary gear set with another member of said planetary gear sets, or with said transmission housing; and a sixth torque-transmitting mechanism selectively interconnecting a member of the first, second or third planetary gear set with another member of said first, second or third planetary gear set, or with said transmission housing; 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.