Clutch actuation using differential pressure

An actuator device for a selectable clutch having a plurality of mode positions for controlling relative rotation between two components connected by the selectable clutch, the actuator device comprising:

• a piston housing having an exterior surface, a piston housing longitudinal bore extending longitudinally there through, a first fluid passage extending inwardly from the exterior surface and intersecting the piston housing longitudinal bore proximate a first bore end, and a second fluid passage extending inwardly from the exterior surface and intersecting the piston housing longitudinal bore proximate a second bore end;
• a piston having a piston body disposed within the piston housing longitudinal bore for longitudinal motion therein,
• wherein a first pressure force acting on the piston body toward the second bore end is equal to a first pressure supplied at the first fluid passage multiplied by a first area equal to a first piston body cross-sectional area of the piston body,
• wherein a second pressure force acting on the piston body toward the first bore end is equal to a second pressure supplied at the second fluid passage multiplied by a second area equal to a second piston body cross-sectional area of the piston body.