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Friction Characteristics of Steel Piston for Diesel Engine
Published May 20, 2009 by Society of Automotive Engineers of Japan in Japan
Event: JSAE Spring Conference
Friction of the steel made piston and cast iron made piston was measured by floating liner method, and the friction of conventional aluminum piston was also measured for the comparison in this study. The measurement of the secondary motion of each piston was carried out for the analysis to piston friction and the following findings have been obtained. FCD piston shows 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 shows hydrodynamic lubrication condition through a cycle due to the lower stiffness of the skirt. The state of lubrication of the steel piston around TDC deteriorates at higher cylinder pressure condition because of the shifting contact point with the cylinder from skirt center to side end of the skirt.