Patent ID: 7014589
Filing Date: 2006-03-21
Classification: F16H

Abstract:
1. A multi-speed transmission comprising: an input shaft; an output shaft; a planetary gear arrangement having first, second, third and fourth planetary gear sets, each planetary gear set having first, second and third members; said input shaft being continuously interconnected with said first member of said first planetary gear set, and said output shaft being continuously interconnected with said second member of said fourth planetary gear set; and said third member of said first planetary gear set being continuously connected with a transmission housing; a first interconnecting member continuously interconnecting said second member of said second planetary gear set with said second member of said third planetary gear set, and a second interconnecting member continuously interconnecting said first member of said third planetary gear set with said first member of said fourth planetary gear set; a first torque-transmitting mechanism selectively interconnecting said second member of said first planetary gear set with said third member of said third planetary gear set; a second torque-transmitting mechanism selectively interconnecting said third member of said second planetary gear set with said transmission housing; a third torque-transmitting mechanism selectively interconnecting said second member of said first planetary gear set with said third member of said second planetary gear set; a fourth torque-transmitting mechanism selectively interconnecting said first member of said first planetary gear set with said second member of said third planetary gear set; a fifth torque-transmitting mechanism selectively interconnecting said second member of said second planetary gear set with said transmission housing; a sixth torque-transmitting mechanism selectively interconnecting said third member of said fourth planetary gear set with said transmission housing; a seventh torque-transmitting mechanism selectively interconnecting said first member of said fourth planetary gear set with said third member of said fourth planetary gear set; and said first, second, third, fourth, fifth, sixth and seventh torque-transmitting mechanisms being engaged in combinations of three to establish seven forward speed ratios and a reverse speed ratio between said input shaft and said output shaft.