Piston ring
OwnerJecee Jarman, Zachary LeDuc +1inventors
InventorsJecee Jarman, Zachary LeDuc, John Holowczak
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Abstract
In accordance with at least one aspect of this disclosure, a pump system for an aircraft includes, a cylinder barrel configured to rotate within a pump housing of a pump, and a plurality of pistons seated within a respective bore defined in the cylinder barrel. Each piston further includes a piston ring disposed at an end thereof configured to form a hydrodynamic seal with an inner surface of the respective bore. Each respective piston ring is of silicon nitride. In embodiments, the piston ring can include a chamfer on at least a leading edge of the piston ring. In embodiments, the piston ring can include a cut therethrough configured to allow for thermal expansion of the piston ring.
Claims20
A pump system for an aircraft, comprising:
- a cylinder barrel comprising a main cylindrical body formed from tool steel, the cylinder barrel configured to rotate within a pump housing of a pump, and
- a plurality of pistons seated within a respective bore defined in the cylinder barrel, wherein each piston further includes a piston ring consisting of silicon nitride disposed at an end thereof configured to form a hydrodynamic seal with an inner surface of the respective bore.
A pump system for an aircraft, comprising:
- a cylinder barrel comprising a main cylindrical body formed from tool steel, the cylinder barrel configured to rotate within a pump housing of a pump, and
- a plurality of pistons seated within a respective bore defined in the cylinder barrel, wherein each piston further includes a piston ring comprised of at least ninety volume percent silicon nitride, with the silicon nitride comprised of less than ten percent in glassy phase, disposed at an end thereof configured to form a hydrodynamic seal with an inner surface of the respective bore.
A pump system for an aircraft, comprising:
- a cylinder barrel comprising a main cylindrical body formed from tool steel, the cylinder barrel configured to rotate within a pump housing of a pump, and
- a plurality of pistons seated within a respective bore defined in the cylinder barrel, wherein each piston further includes a ceramic piston ring comprised of silicon nitride, the piston ring being disposed at an end thereof configured to form a hydrodynamic seal with an inner surface of the respective bore.
Dependencies are inferred from the claim text.