Automobile engine valve gear system SIMM and rihuta, and these and being automobile engine valve gear system

摘要

PROBLEM TO BE SOLVED: To suppress breakage and exfoliation of a film occurring during application of the film to a slide part, regarding a rigid thin film having less ductility, secure reliability for durability and realize a low friction factor, and provide combination of an automobile valve system shim, a lifter, and a cam shaft excellent in friction characteristics and durability.;SOLUTION: An automobile engine valve system shim or filter slides with the cam lobe of a cam shaft forming a mating material to drive a suction exhaust valve for an internal combustion engine. The outermost surface of a surface sliding with a cam lobe forming a mating material is covered by a rigid carbon film. The rigid carbon film has surface hardness of 1500-4500 kg/mm² in Knoop hardness, a film thickness is 0.3-2.0 μm, and surface roughness Ry (μm) satisfies a relation represented by a formula Ry{(0.75-Hk/8000)×h+0.07/0.8}...(A), wherein h in the formula is the thickness (μm) and Hk indicates Knoop hardness (kg/mm²) of the rigid carbon film.;COPYRIGHT: (C)2002,JPO