Patent ID: 8133148
Filing Date: 2012-03-13
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, wherein the third member of the third planetary gear set is formed on an outer surface of the first member of the second planetary gear set, wherein the third member of the third planetary gear set includes an inner surface that defines an internal cavity, wherein the first, second, and third members of the second planetary gear set are disposed within the internal cavity, and wherein the input member is continuously interconnected to the second member of the second planetary gear set and the output member is continuously interconnected to the second member of the first planetary gear set and the second member of the third planetary gear set; a first interconnecting member continuously interconnecting the first member of the first planetary gear set with the second member of the fourth planetary gear set; a second interconnecting member continuously interconnecting the second member of the first planetary gear set with the second member of the third planetary gear set; a third interconnecting member continuously interconnecting the third member of the first planetary gear set with the third member of the second planetary gear set; and five torque transmitting mechanisms selectively engageable to interconnect one of the first, second, and third members with another of the first, second, third members and a stationary member, and wherein the torque transmitting mechanisms are selectively engageable in combinations of at least three to establish at least eight forward speed ratios and at least one reverse speed ratio between the input member and the output member.