Friction Characteristics of Steel Piston for Diesel Engine

Abstract

It is forecast that the use of an iron piston expands due to higher power of the truck diesel engine. So, purpose of this study is to clarify the lubricated condition of the cast iron piston and the steel piston. Friction of the steel piston and the cast iro npiston were measured by floating liner method, and the friction of conventional aluminum piston also measured for he comparison in this study. The measurement of the secondary motion of each piston were carried out for the analysis to pisotn friction and following findings have been obtained. FCD piston showed boundary lubrication at compression top dead center(TDC). It is presumably caused by the lager tilting angle of the piston induced by larger piston clearance. Steel piston showed hydrodynamic lubrication condition in the TDC and BDC through a cycle due to the oil supply to the skirt.