| 摘要 |
A combined piston ring comprising a special gap effective for reducing blowby to have excellent gas sealability, comprising a piston ring body of a high-strength, heat-resistant resin comprising a step-shaped gap exposed on upper and lower side surfaces and an outer peripheral surface, and a spring disposed on the inner peripheral side of the piston ring body for pushing the piston ring body radially outward, at least a side surface of the piston ring body on the combustion chamber side having a heat-resistant coating, whereby the side surface of the piston ring on the combustion chamber side is not subject to local deformation and melting by a burned gas from the combustion chamber.
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