抄録
Oil consumption is caused by the evaporation of oil film left on the cylinder wall or by the combustion of oil flowing out to the combustion camber through the piston ring gap. This study focusedd on oil outflow through the piston ring gap under a high vacuum operating condition in the intake manifold. Moreover, the oil film was visualized to determine oil film thickness. As a result, the oil flowed out steadily from the piston ring gaps at this operating condition, and moved through the surface of the top land to the combustion chamber. It was also found that the amount of oil outflow and the oil consumption were affected by the end gap design of the top ring.
