PISTON RING, PISTON AND PISTON ENGINE

摘要

PROBLEM TO BE SOLVED: To provide a piston ring capable of reducing quantity of a lubricating oil supplied from an oilhole without increasing friction and abrasion, a piston equipped with the piston ring, and a piston engine equipped with the piston. SOLUTION: This piston ring 10 is arranged in a plurality of ring grooves 12 formed on a piston body 11 mainly in order to keep airtightness of a high pressurized gas G generated on a piston head 13 side. The piston ring 10 is made of a thermoplastic resin having a self-lubricating property.