PISTON RING FOR ENGINE AND MANUFACTURING METHOD THEREOF

摘要

PURPOSE: An engine piston ring and a manufacturing method thereof are provided to reduce frictional loss and to improve fuel efficiency. CONSTITUTION: An engine piston ring comprises a Cr coating layer(200), Si-DLC(Diamond-Like Carbon) coating layers(600). The Cr coating layer is coated on the surface of a base material. The Si-DLC coating layer is coated on the outermost layer of the base material.