Abstract
This paper describes load sharing of piston skirt in mixed lubrication. It can be estimated that piston friction coefficient is approximately same level as piston ring o measured friction at firing condition. Experimental results by means of both change of oil supply and applied load, using test piece with streak shape indicate that piston skirt is under mixed lubrication at least in expansion stroke because of starved oil supply. Also, it is found that load supported by fluid film is closely related with average depth of worn streak and oil starvation level, but without nearly applied load.
