Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1985-12-27
1987-06-02
Shoap, Allan N.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277157, 277165, 277193, 277215, 277216, F16J 906, F16J 908, F16J 1540
Patent
active
046697365
ABSTRACT:
A sealing piston ring assembly for a Stirling engine which is effective to maintain the required pressure differential on opposite sides of the piston while still enabling free reciprocating movement of the piston within the cylinder. The piston ring assembly consists of a main annular ring member formed of metal and pair of sealing ring units on opposite end faces of the main ring member that are formed of low frictional material and are continuously urged into sealing engagement with the cylinder wall. Each sealing ring unit comprises a pair of thin axially engaged annular sealing ring members which are slotted so that they have spaced ends and are circumferentially expansible to maintain the necessary seal with the cylinder wall. In each unit, the slots in the sealing ring members are circumferentially spaced so that they do not affect the ability of the sealing ring unit to effectively seal against one wall of the piston ring groove, the units being alternately engageable with the piston ring groove walls during reciprocation of the piston. The slots can be particularly shaped to insure this necessary seal.
REFERENCES:
patent: 1988726 (1935-01-01), Godron
patent: 2348939 (1944-05-01), Thompson
patent: 2349170 (1944-05-01), Jackman
patent: 2466428 (1949-04-01), Hufferd et al.
patent: 3455565 (1969-07-01), Jepsen
patent: 3522950 (1970-08-01), Scheck, Jr.
Shoap Allan N.
Stirling Thermal Motors, Inc.
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