Piston ring

Details Piston ring Piston ring

1998-09-28

2000-11-07

Knight, Anthony

Seal for a joint or juncture

Seal between relatively movable parts

Piston ring or piston ring expander or seat therefor

277442, 277444, 277938, F16J 926

Patent

active

061424811

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 30 micrometers on the gas nitrided layer at the upper and lower surfaces. The hard film comprises diamond-like carbon in which are dispersed 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. The hard film may be formed directly on the upper and lower surfaces of the piston ring in a thickness from 0.5 to 30 micrometers

REFERENCES:
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, No. 04000064, Publ. Jun. 1992 (Riken Corp.).

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