Patent ID: 7691022

Claim:
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 the second member of the first planetary gear set with the third member of the second planetary gear set; a second interconnecting member continuously connecting the first member of the second planetary gear set with the first member of the third planetary gear set; a third interconnecting member continuously connecting the second member of the third planetary gear set with the third member of the fourth planetary gear set; a fourth interconnecting member continuously connecting the third member of the first planetary gear set with the third member of the 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.