Patent ID: 6689010
Filing Date: 2004-02-10
Classification: F16H

Abstract:
A transmission comprising:an input shaft; an output shaft; a transmission housing; a first planetary gearset having a first member, a second member, and a third member; a second planetary gearset having a first member, a second member, and a third member; a third planetary gearset having a first member, a second member, and a third member; a first interconnecting member continuously interconnecting said first member of said first planetary gearset with said first member of said second planetary gearset; a second interconnecting member continuously interconnecting said second member of said second planetary gearset with said first member of said third planetary gearset; a third interconnecting member continuously interconnecting said second member of said first planetary gearset with either said third member of said second planetary gearset, or said second member of said third planetary gearset; a member of said first planetary gearset being continuously interconnected with a stationary transmission housing; said output shaft being continuously interconnected with at least one member of one of said planetary gearsets; said input shaft being non-continuously interconnected with members of the planetary gearsets; six torque-transmitting mechanisms selectively connecting members of said planetary gearsets with said input shaft, said output shaft, said transmission housing or other members of said planetary gearsets, and being selectively engageable in combinations of two to establish at least seven forward speed ratios and one reverse speed ratio between said input shaft and said output shaft; and at least two of said torque-transmitting mechanisms being operable to provide selective connections between said input shaft and at least one member of one of said planetary gearsets.