Patent ID: 8272986

Claim:
A transmission configured for receiving power from an engine comprising: an input member connectable with the engine; an output member; a stationary member; a transmission gearing arrangement operatively connected between the input member and the output member and including a plurality of rotatable gear members; a clutch having an engaged state and a disengaged state; wherein the clutch transmits torque between one of the gear members and another of the gear members, between said one of the gear members and the stationary member, or between the engine and the transmission when in the engaged state, and does not transmit torque when in the disengaged state; wherein the clutch includes a mechanical member selectively movable to a first position in which the mechanical member is configured to retain the clutch in the engaged state without application of power, including at least hydraulic, pneumatic, and electrical power; wherein the mechanical member is further selectively movable to a second position in which the mechanical member is configured to retain the clutch in the disengaged state without application of power, including at least hydraulic, pneumatic, and electrical power; a hydraulically-actuated valve having a first and a second piston and a piston support connecting the first and the second piston; wherein the hydraulically-actuated valve at least partially defines a first annular chamber at the first piston and a second annular chamber at the second piston; wherein the piston support is operatively connected to the mechanical member such that the mechanical member is movable to the first position by application of hydraulic pressure in the first annular chamber to place the clutch in the engaged state and is movable to the second position by application of hydraulic pressure in the second annular chamber to place the clutch in the disengaged state; and a plurality of levers operatively connected to the mechanical member and to the piston support and configured to pivot at the housing and to provide a mechanical advantage between the hydraulically-actuated valve and the mechanical member.