Patent ID: 8226521
Filing Date: 2012-07-24
Classification: F16H

Abstract:
1. A transmission comprising: an input member; an output member; first, second, third and fourth planetary gear sets each having first, second and third members, and wherein the input member is continuously interconnected with the first member of the fourth planetary gear set and the output member is continuously interconnected with the second member of the third planetary gear set and the second member of the fourth planetary gear set; five interconnecting members each continuously interconnecting one of the first, second and third members of one of the planetary gear sets with one of the first, second and third members of another of the planetary gear sets; and a first torque transmitting device selectively engageable to interconnect at least one of the first member of the first planetary gear set and the first member of the second planetary gear set with the first member of the fourth planetary gear set; a second torque transmitting device selectively engageable to interconnect the second member of the first planetary gear set with the first member of the fourth planetary gear set; a third torque transmitting device selectively engageable to interconnect the third member of the first planetary gear set with a stationary member; a fourth torque transmitting device is selectively engageable to interconnect at least one of the second member of the first planetary gear set and the second member of the second planetary gear with the stationary member, and a fifth torque transmitting device selectively engageable to interconnect the third member of the third planetary gear set with the stationary member; and wherein the torque transmitting devices are selectively engageable in combinations of at least two to establish at least eight forward speed ratios and at least one reverse speed ratio between the input member and the output member.