Seal for a joint or juncture – Seal between relatively movable parts – Piston ring or piston ring expander or seat therefor
Patent
1998-05-14
2000-12-19
Knight, Anthony
Seal for a joint or juncture
Seal between relatively movable parts
Piston ring or piston ring expander or seat therefor
277444, F16J 926
Patent
active
061618373
ABSTRACT:
An improved piston ring is disclosed, together with a process form making the ring. An annular steel base body has a lower layer formed by electro-plating a peripheral surface of the body with either a chromium or titanium nitrided gas. The ring is normally lapped until dull, smooth and free of residual metallic plating nodules, yielding random micro-abrasions in the lower layer. An upper layer of metallic nitride or chromium ceramic is formed onto the lapped lower layer, using physical vapor deposition means.
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Beres John
Detroit Diesel Corporation
Knight Anthony
Panagos Bill C
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