Study on the Movement of a Piston Pin : Measurements of Axial Movement and Load of Piston Pin

Abstract

The axial movement and load of a full floating-type piston pin were measured and the underlying mechanism was experimentally analyzed. Small bearing clearance of the connecting rod small-end or nonparallelism of big and small-ends led to deterioration of the lubricating characteristics of the small-end, which resulted in increasing linking degree of the piston pin and the connecting rod small-end and increasing axial load of the piston pin. The connecting rod mass was found to affect the measured load in the analysis of the relation between the load impulse and the piston pin velocity. These results indicated that the design factor of the connecting rod had a large effect on the improvement of the lubricating characteristics and the suppression of the axial movement and load of the piston pin.