Patent ID: 8968143
Filing Date: 2015-03-03
Classification: F16H,Y10T

Abstract:
1. A transmission in a motor vehicle, the transmission comprising: an input member; an output member; first, second, third and fourth planetary gear sets each having first, second and third members; five torque transmitting mechanisms each selectively engageable to interconnect one of the first, second, and third members with at least one other of the first members, second members, third members and a stationary member, 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; and a first latching mechanism connected to a second of the five torque transmitting mechanisms, wherein the first latching mechanism latches the second torque transmitting mechanism in a ready state when the motor vehicle is stopped; a second latching mechanism connected to a first of the five torque transmitting mechanisms, wherein the second latching mechanism latches the first torque transmitting mechanism in a ready state when the motor vehicle is stopped; and a third latching mechanism connected to the first of the five torque transmitting mechanisms, wherein the third latching mechanism latches the first torque transmitting mechanism in a ready state when the motor vehicle is stopped, wherein the first and second torque transmitting mechanisms are in the engaged state during a first forward gear or a second forward gear.