Patent ID: 7695398
Filing Date: 2010-04-13
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 second member of said second planetary gear set; a second interconnecting member continuously connecting said third member of the second planetary gear set with said second member of said third planetary gear set and with said third member of said fourth planetary gear set; a third interconnecting member continuously connecting said first member of said first planetary gear set with said first member of said third planetary gear set; and six torque-transmitting devices for selectively interconnecting said members of said planetary gear sets with a stationary member or with other members of said planetary gear sets, said six torque-transmitting devices being engaged in combinations of three to establish at least nine forward speed ratios and at least one reverse speed ratio between said input member and said output member.