Piston ring and method of making the same

Details Piston ring and method of making the same Piston ring and method of making the same

1987-12-17

1989-01-24

Ward, Robert S.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

291566, 267 15, F16J 920, B23P 1506

Patent

active

047996943

ABSTRACT:
A piston ring assembly has an expander spring of sheet material bent into an annular configuration. The expander spring has a circumferential series of radially oriented tongues and each tongue has an approximately axially bent leg. The tongues and legs are defined by stamped-out slots provided in the expander spring in an alternatingly radially inwardly and radially outwardly oriented circumferential series. The expander spring has stamping burrs bounding the slots. The piston ring assembly further has two laminar oil scraper rings arranged generally concentrically with respect to the expander spring. The laminar oil scraper rings are axially supported by the tongues and are radially supported by the legs. The burrs are situated such that they are submitted solely to compression forces derived from bending stresses generated as a result of bending the spring into the annular configuration.

REFERENCES:
patent: 2111258 (1938-03-01), Zahodiakin
patent: 2697865 (1954-12-01), Norton
patent: 2834096 (1958-05-01), Norton
patent: 2837385 (1958-06-01), Mayfield
patent: 3181875 (1965-05-01), Shepard
patent: 3477732 (1969-11-01), Warrick
patent: 3633260 (1972-01-01), Warrick
patent: 3701275 (1972-10-01), Overway et al.
Spur et al, "Umformen und Zerteilen" (Reshaping and Severing), Handbuch der Fertigungstechnik (Handbook of the Manufacturing Technology), vols. 2/3, 1985, pp. 1290-1293, 1384-1385.

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