COMBINATION OF CYLINDER AND PISTON RING

• Main Authors: SHIBATA SHIRO, TAKEUCHI KOJI
• Format: Patent
• Language: English
• Published: 09.04.2003
• Edition: 7
• Subjects: APPARATUS THEREFOR; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES; BLASTING; CASTING; CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES; CHEMISTRY; COMBUSTION ENGINES; CYLINDERS; CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ELECTROFORMING; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; LIGHTING; MECHANICAL ENGINEERING; METALLURGY; PERFORMING OPERATIONS; PISTONS; POWDER METALLURGY; PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS; SEALINGS; THERMAL INSULATION IN GENERAL; TRANSPORTING; WEAPONS

PROBLEM TO BE SOLVED: To provide the combination of a cylinder and a piston ring capable of reducing frictional force in sliding and the abrasion of both of the cylinder and the piston ring, and improving its scuff-proof characteristic. SOLUTION: The combination is composed of the aluminium alloy cylinder and the piston ring provided with hard chrome laminated plating film composed of at least two hard chrome plating layers at least on an outer peripheral sliding face of a base material surface. The hard chrome plating layers forming the hard chrome laminated plating film are provided with fine cracks including a part opened to an outer face side and stayed in each hard chrome plating layer having the self-opening with respect to its depth direction, and a part extended to the hard chrome plating layer lower than the hard chrome plating layer having the self-opening, in a distributed state. Whereby the oil-holding property can be improved, the change of the oil-holding property is hardly found, and the low frictional force can be constantly kept in sliding.