表面粗さ,境界潤滑,弾性変形を考慮したピストンスカート部潤滑解析

A computer program has been developed to analyze piston-skirt lubrication under conditions close to those in an actually operating engine. The program takes into account boundary lubrication and effects on the oil film pressure due to surface characteristics. It also considers the original profile, thermal expansion and elastic deformation of the piston-skirt, and can generate realistic results in this manner. The variation of piston-skirt lubrication conditions, such as boundary lubrication area and friction force, during an engine cycle has been analyzed in relation to such parameters as surface waviness, oil temperature, engine load and speed ; thus, a good understanding of piston-skirt lubrication has been obtained.