Patent ID: 7798934
Filing Date: 2010-09-21
Classification: F16H

Abstract:
1. A multi-speed transmission comprising: an input member; an output member; first, second, third and fourth planetary gear sets each having first, second and third members; a first interconnecting member continuously connecting said third member of said first planetary gear set with said first member of said second planetary gear set; a second interconnecting member continuously connecting said second member of said third planetary gear set with said third member of said fourth planetary gear set; a third interconnecting member continuously connecting said third member of said third planetary gear set with said second member of said fourth planetary gear set; said third member of said first planetary gear set being continuously connected with a stationary member; and five torque-transmitting devices, wherein each torque-transmitting device selectively interconnects a respective member of said planetary gear sets with the stationary member or with another member of said planetary gear sets, said five torque-transmitting devices being engaged in combinations of three to establish at least eight forward speed ratios and at least one reverse speed ratio between said input member and said output member, and a first of said five torque-transmitting devices is operable for selectively connecting said first member of said first planetary gear set with said stationary member.