Analysis on Piston Skirt Friction

- Effect of Oil Film Distribution on Piston Skirt -

Abstract

Understanding of piston skirt friction is important for reducing piston friction in internal combustion engines. For this purpose, the oil film distribution on the piston skirt is visualized and observed in a gasoline engine with a transparent sapphire cylinder. In this study, friction calculations are carried out for the striated oil film area of skirt. It is supposed that the area has a Couette flow by analyzing oil film images. It is found that the friction of the striated oil film area is around 3.5 to 9.9% of the friction of whole skirt.