PISTON RING

PROBLEM TO BE SOLVED: To provide a chromium-plated piston ring excellent in oil retainability and having fatigue strength and film impact strength withstanding the high outputting of an internal combustion engine. SOLUTION: An under coat layer (lowest chromium plating layer) 2 is formed on the outer...

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Bibliographische Detailangaben
1. Verfasser:	TAMEGAI ETSUO
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS THEREFOR BLASTING CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL CYLINDERS DIFFUSION TREATMENT OF METALLIC MATERIAL ELECTROFORMING ELECTROLYTIC OR ELECTROPHORETIC PROCESSES ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL LIGHTING MECHANICAL ENGINEERING METALLURGY PISTONS PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS SEALINGS SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION THERMAL INSULATION IN GENERAL WEAPONS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a chromium-plated piston ring excellent in oil retainability and having fatigue strength and film impact strength withstanding the high outputting of an internal combustion engine. SOLUTION: An under coat layer (lowest chromium plating layer) 2 is formed on the outer face including at least the sliding face of a piston ring body 1, and, a chromium plating layer group 3 is formed thereon. The chromium plating layer group 3 is composed of laminated plating 3A consisting of the aggregation of plural chromium plating layers 3a, 3b having the same thickness and an outermost circumferential chromium plating layer 3B formed on the outermost circumference and subjected to polishing working along the sliding face. Fine cracks are formed on the surface of each chromium plating layer 3a, 3b by a reverse electrolysis stage. The outermost circumferential chromium plating layer 3B is thicker than each chromium plating layer 3a or the like composing the laminated plating 3A, and the thickness of the outermost circumferential chromium plating layer 3B is within the range of 1 to 80 μm.