Piston Pin Noise Analysis of Press Fit Type Piston (Semi-floating System) (Second Report)

- Clarification of the Mechanism of Piston Pin Noise -

Abstract

In this research, it is a goal to clarify the mechanism of piston pin noise for the press fit type. CAE analysis and engine measurement for understanding of piston and piston pin behavior were conducted. As a result of each approach, it was made obvious that the pin noise is composed of the collision between piston and piston pin and the piston slap. And the relationship between the oil effect (1st report) and the piston and piston pin behavior was considered. It is suggested that the improvement of lubrication in piston pin hole reduces the piston pin noise level. Concerning the results of the CAE analysis, it was clarified that they have high correlation with actual engine behavior. So the CAE analysis was useful for the optimization of piston shape with the good piston pin noise level.