Piston ring and method of making same

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

1979-09-12

1981-11-10

Ward, Jr., Robert S.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277224, 291566, F16J 922

Patent

active

042994012

ABSTRACT:
A piston ring is to be mounted in a groove in a piston. The piston ring has sidewalls for engaging sidewalls of the piston ring groove. Each of the sidewalls of the piston ring is hardened in respective localized areas. The localized areas each include a band of hardened material extending around each respective sidewall of the piston ring near the outer periphery of the piston ring. The hardened areas terminate short of the outer periphery of the piston ring. The piston ring due to the termination of the hardened areas short of the outer periphery of the piston ring has unhardened side surface areas immediately adjacent the outer periphery thereof for location adjacent the corners of the piston ring groove at the outer periphery of the piston. The localized areas are hardened by moving a piston ring blank relative to a laser beam, after the piston ring blank is machined.

REFERENCES:
patent: 2511874 (1950-06-01), Phillips
patent: 2905512 (1959-09-01), Anderson
patent: 3435502 (1969-04-01), Thompson et al.
patent: 3575433 (1971-04-01), Beyer et al.
patent: 3650537 (1972-03-01), Sugahara
patent: 4123072 (1978-10-01), Sharpe
patent: 4161321 (1979-07-01), Hendrixon et al.
Iron Age, Jan. 31, 1977, pp. 25-28.
Laser Technology, 1979, 2nd Edition, pp. 128-131 & title page, (Howard W. Sams & Co., Inc.: Indianapolis), Muncheryan.
Production, Nov. 1976, pp. 74-81.

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