Seal for a joint or juncture – Seal between relatively movable parts – Piston ring or piston ring expander or seat therefor
Patent
1998-09-28
2000-10-31
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
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.
Iwashita Takatsugu
Yamashita Nobuyuki
Knight Anthony
Schwing Karlena D.
Teikoku Piston Ring Co. Ltd.
LandOfFree
Piston ring does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Piston ring, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Piston ring will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2042970