Piston ring

Seal for a joint or juncture – Seal between relatively movable parts – Piston ring or piston ring expander or seat therefor

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Details

277442, 277444, 277938, F16J 926

Patent

active

061390224

ABSTRACT:
A piston ring is formed over the entire surface with a gas nitrided layer and a hard film with a thickness of 0.5 to 10 micrometers on the gas nitrided layer at the outer circumferential surface. The hard film comprises diamond-like carbon in which are dispersed carbides of one or more elements selected from the group consisting of silicon, titanium, tungsten, chromium, molybdenum, niobium, and vanadium. The diamond-like carbon is configured with any one of an amorphous carbon structure, an amorphous carbon structure having partly a diamond structure, or an amorphous carbon structure having partly a graphite structure. The content of the above elements is 5 to 40 atomic percent, and the hard film has a Vicker's hardness in a range from 700 to 2,000. A chromium plating film or ion plating film may be used instead of the gas nitrided layer. The hard film may be formed directly on the outer circumferential surface of the piston ring in a thickness from 10 to 30 micrometers

REFERENCES:
patent: 3731941 (1973-05-01), Mori et al.
patent: 4974498 (1990-12-01), Lemelson
patent: 5582414 (1996-12-01), Miyazaki et al.
patent: 5601293 (1997-02-01), Fukutome et al.
patent: 5743536 (1998-04-01), Komuro et al.
patent: 5820131 (1998-10-01), Tanaka et al.
patent: 5960762 (1999-10-01), Imai
Patent Abstracts of Japan, Shigeru, "Combination of Piston Rings", Publication No. JP 55069744, published May 26, 1980.

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