Abstract
It is research of piston pin noise of press fit type. Piston supporting system can be roughly divided into floating type called “full-floating” and press fit type called “semi-floating”. The semi-floating system is often used for its cost advantage. This type of supporting system, on the other hand, is more likely to cause piston pin noise. So, in this research, the goal is piston pin noise level of semi-floating system reduce to the same level as full-floating system, via clarification of mechanism of piston pin noise and optimization of piston shape. First of all, in this report, the aims are to be cleared oil behavior at piston pin noise occurred with visualization. As a result of visualization, it was cleared that oil came rushing out from pin hole via groove and doesn’t reach to piston hole from undersurface of piston land.
