Patent ID: 6679803
Filing Date: 2004-01-20
Classification: F16H

Abstract:
A family of transmissions having a plurality of family embers wherein each family member comprises:an input shaft; an output shaft; a transmission housing; a first planetary gearset having first, second, and third members, each member comprised of a sun gear member, a ring gear member or a planet carrier assembly member; a second planetary gearset having first, second, and third members, each member comprised of a sun gear member, a ring gear member or a planet carrier assembly member; a third planetary gearset having first, second, and third members, each member comprised of a sun gear member, a ring gear member or a planet carrier assembly member; an interconnecting member continuously interconnecting said first members of said planetary gearsets; said second member of said first planetary gearset being continuously interconnected with said transmission housing; said input shaft being continuously interconnected with a member of one of said planetary gearsets; said output shaft being continuously interconnected with another member of one of said planetary gearsets; a first torque transmitting mechanism selectively interconnecting a member of said first planetary gearset with either said input shaft, said output shaft, said interconnecting member, or a member of said second or third planetary gearset; a second torque transmitting mechanism selectively interconnecting a member of said second planetary gearset with either said input shaft, said output shaft, said interconnecting member, or a member of said first or third planetary gearset; a third torque transmitting mechanism selectively interconnecting a member of said third planetary gearset with either said input shaft, said output shaft, said interconnecting member, or a member of said first or second planetary gearset; a fourth torque transmitting mechanism selectively interconnecting a member of one of said planetary gearsets with said interconnecting member or another member of said one of said planetary gearsets; or selectively interconnecting said transmission housing with a member of said second or third planetary gearset; a fifth torque transmitting mechanism selectively interconnecting a member of one of said planetary gearsets with said input shaft, said output shaft, or another member of one of said planetary gearsets; or selectively interconnecting said transmission housing with a member of one of said planetary gearsets; and said five torque transmitting mechanisms being operable in combinations of two to establish at least six forward speed ratios and one reverse ratio between said input shaft and said output shaft.