摘要:
A low friction sliding combination of a cam and a cam follower which are in slidable contact with each other in presence of a lubricating oil. The cam follower includes a cylindrical and hollow outer roller (24) having an outer peripheral surface in slidable contact with the cam (12). A fixed pin (22) is coaxially disposed inside the outer roller and rotatably movable relative to the outer roller. A diamond-like carbon material is coated on a sliding surface of at least one of the outer roller (24) and the fixed pin (12). The lubricating oil contains at least one of ashless fatty acid ester friction modifier and ashless aliphatic amine friction modifier.
摘要:
A member for an internal combustion engine, such as a piston, a valve and a fuel injection valve. The member includes a substrate. A carbon-based coating film is formed on the substrate to cover at least a part of a region of the substrate to which region fuel for the internal combustion engine is contactable. The carbon-based coating film contains fluorine and has a thickness of 10 µm or less.
摘要:
A piston for an internal combustion engine of an automotive vehicle. The piston has a piston ring and a piston skirt section each of which has a sliding section in slidable contact with a cylinder bore section of a cylinder block in presence of a lubricating oil. The cylinder bore section is formed of eutectic or hyper-eutectic aluminum alloy. Additionally, a hard carbon thin film is coated on the sliding section of the piston 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.
摘要:
A fuel injection valve for an automotive internal combustion engine comprises a needle valve and an opposite member which are in slidable contact with each other in presence of fuel. A hard carbon thin film is coated on at least one of the sliding sections of the base materials of the needle valve and the opposite member. The hard carbon thin film has a surface hardness ranging from 1500 to 4500 kg/mm 2 in Knoop hardness, a film thickness ranging from 0.3 to 2.0 µm, and a surface roughness (Ry) (µm) which satisfies a relationship represented by the following formula (A): Ry where h is the thickness (µm) of the hard carbon thin film; Hk is the surface hardness in Knoop hardness (kg/mm 2 ) of the hard carbon thin film.
摘要:
A sliding structure for an automotive engine includes a sliding member with a sliding portion and a lubricant applied to the sliding portion so that the sliding portion can make sliding contact with a counterpart member via the lubricant. The sliding member is either of a piston ring, a piston pin, a cam lobe, a cam journal, a plain bearing, a rotary vane and a timing chain. The sliding portion has a base made of a steel or aluminum material and a hard carbon film formed on the base to coat the sliding portion. The hard carbon film has a thickness of 0.3 to 2.0 µm, a Knoop hardness of 1500 to 4500 kg/mm 2 , a surface roughness Ry (µm) satisfying the following equation: Ry 2 ) of the film.