Piston for internal combustion engine

• Main Author: NISHIMURA KIMIO,MABUCHI YUTAKA,HAMADA TAKAHIRO,KANO MAKOTO,MIYAKE HIDENORI,OTA TOMOHITO
• Format: Patent
• Language: English
• Published: 11.07.2007
• Subjects: ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES; 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; COMBUSTION ENGINES; CYLINDERS; CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; DIFFUSION TREATMENT OF METALLIC MATERIAL; ENGINEERING ELEMENTS AND UNITS; FUELS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; LIGHTING; LUBRICANTS; LUBRICATING COMPOSITIONS; MACHINES OR ENGINES FOR LIQUIDS; MECHANICAL ENGINEERING; METALLURGY; OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR; PEAT; PETROLEUM, GAS OR COKE INDUSTRIES; PISTONS; POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS; PRODUCING MECHANICAL POWER; SEALINGS; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TECHNICAL GASES CONTAINING CARBON MONOXIDE; THERMAL INSULATION IN GENERAL; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATINGINGREDIENTS IN A LUBRICATING COMPOSITION; WEAPONS; WIND, SPRING WEIGHT AND MISCELLANEOUS MOTORS

A piston (3) for an internal combustion engine (1) of an automotive vehicle. The piston (3) has a piston ring (4) and a piston skirt section (3a) each of which has a sliding section in slidable contact with a cylinder bore section (2a) of a cylinder block (2) in presence of a lubricating oil. The cylinder bore section (2a) is formed of eutectic or hyper-eutectic aluminum alloy. Additionally, a hard carbon thin film is coated on the sliding section of the piston (3) and contains hydrogen atom in an amount of not more than 1 atomic %. Here, the lubricating oil contains at least one selected from the group consisting of ashless fatty acid ester friction modifier, ashless aliphatic amine friction modifier, polybutenyl succinimide, derivative of polybutenyl succinimide, zinc dithiophosphate, and derivative of zinc dithiophosphate.