Reverse taper piston for pneumatic actuators
AssigneeBorgWarner Inc.
InventorsRYAN THOMAS HOWELL, Brian Edward Handlon
Life of this patent
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Abstract
A product may include a canister and a diaphragm may separate a control chamber within the canister. A piston may be movable in the canister between a first position and a second position in response to a pressure change in the control chamber. The piston may have a body and a skirt may extend from the body. The skirt may taper inward relative to the body as the skirt extends away from the body.
Claims15
A product comprising a canister, a diaphragm separating a control chamber within the canister, a piston movable in the canister between a first position and a second position in response to a pressure change in the control chamber, the piston has a body and a skirt extending from the body, the skirt tapering inward relative to the body as the skirt extends away from the body.
A product comprising a canister with an interior defined by a perimeter wall extending between a first end and a second end, a piston that has a body oriented substantially perpendicular to the perimeter wall and extending across a portion of the interior, the piston body defining a piston perimeter as a part of the piston closest to the perimeter wall, a skirt extending from the body at the piston perimeter from a proximal edge at the piston perimeter to a terminal edge, the skirt tapering away from the perimeter wall from the proximal edge to the terminal edge, and a diaphragm extending across the interior to the perimeter wall and separating out a control chamber in the canister.
A method of increasing the position control resolution of a valve plate comprising:
- providing a canister;
- assembling a piston in the canister;
- providing an actuator shaft connected with the valve plate, connecting the actuator shaft to the piston;
- providing the piston with an outer perimeter;
- extending a skirt from a proximal edge at the outer perimeter to a terminal edge, locating the terminal edge at a position further from the outer perimeter than the proximal edge and closer to the actuator shaft than the outer perimeter;
- connecting a diaphragm across the canister to separate a control chamber in the canister;
- moving the piston to a first position where the diaphragm overlies and contacts the skirt to place the valve plate is in a closed position;
- and moving the piston to a second position to open the valve to a full open position where the diaphragm separates from the skirt;
- and
- providing a reduced effective area of the piston when in the first position relative to when in the second position, by forming a trough behind the piston that is open to the control chamber.
Dependencies are inferred from the claim text.