Abstract
An analyzing system of oil film behavior was developed which measures oil film thickness on the piston skirt bearing area using oil film images obtained by high-speed digital camera through the sapphire liner. Quantified oil film images were animated to observe oil film movement and analyze the factors affecting the oil film formation on the piston skirt. As a result, new phenomena of the oil supply route to the skirt bearing area were observed during the upward stroke of the piston as well as the downward stroke. The factors influenced to the oil film formation were identified.
