Patent ID: 6656078
Filing Date: 2003-12-02
Classification: F16H

Abstract:
A family of six-speed transmissions, each family member comprising:an input shaft; an output shaft; a transmission housing; a planetary gear arrangement including a first planetary gearset, a second planetary gearset, a third planetary gearset, a first interconnecting member, a second interconnecting member, and five torque transmitting mechanisms; said first planetary gearset having a first member, a second member, and a third member, said second planetary gearset having a first member, a second member, and a third member, said third planetary gearset having a first member, a second member, and a third member; said first interconnecting member continuously interconnecting said first member of said first planetary gearset, said first member of said second planetary gearset, and said first member of said third planetary gearset; said second interconnecting member continuously interconnecting said second member of said first planetary gearset and said second member of said second planetary gearset; said second member of said third planetary gearset being continuously interconnected with said transmission housing; said output shaft being continuously interconnected with at least one member of one of said planetary gearsets; a first of said torque transmitting mechanisms being operable to selectively interconnect said input shaft with a member of a first group consisting of said members of said first and second planetary gearsets; a second of said torque transmitting mechanisms being operable to selectively interconnect said input shaft with a member of a second group consisting of said members of said second and third planetary gearsets; a third of said torque transmitting mechanisms being operable to selectively interconnect said input shaft with a member of a third group consisting of said members of said first, second, and third planetary gearsets; a fourth of said torque transmitting mechanisms being operable to either selectively interconnect one member of said third group with another member of said third group or selectively interconnecting said transmission housing with a member of a fourth group consisting of said members of said second and third planetary gearsets and said interconnecting members; a fifth of said torque transmitting mechanisms being operable to selectively interconnect said transmission housing with a member of said third group; and said five torque transmitting mechanisms being operable in combinations of two to establish six forward speed ratios and one reverse speed ratio between said input shaft and said output shaft through said planetary gear arrangement.