Patent ID: 6656077
Filing Date: 2003-12-02
Classification: F16H

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