PISTON RING ASSEMBLY AND METHOD OF MAKING SAME

摘要

A piston and piston ring assembly wherein the piston is provided with a piston ring receiving groove having at least one inwardly converging side wall and as associated piston ring loosely received within the groove wherein the piston ring has at least one inwardly converging side wall of curved cross-section in facing relation with the inwardly converging side wall of the groove of the piston.