Patent ID: 7905809
Filing Date: 2011-03-15
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; a first torque transmitting mechanism selectively engageable to interconnect the input member with the first member of the second planetary gear set; a second torque transmitting mechanism selectively engageable to interconnect the third member of the fourth planetary gear set with at least one of the third member of the first planetary gear set and the third member of the second planetary gear set; a third torque transmitting mechanism selectively engageable to interconnect the second member of the first planetary gear set with the third member of the fourth planetary gear set; a fourth torque transmitting mechanism selectively engageable to interconnect the second member of the fourth planetary gear set with at least one of the third member of the first planetary gear set and the third member of the second planetary gear set; and a fifth torque transmitting mechanism selectively engageable to interconnect the second member of the fourth planetary gear set with the third member of the third planetary gear set, and wherein a plurality of combinations of two torque-transmitting mechanisms are disengaged to establish at least eight forward speed ratios and at least one reverse speed ratio between the input member and the output member.