| 摘要 |
PURPOSE: Structure of a piston ring is provided to improve sealing performance of combustion gas by unifying three piston rings and removing a gap in an incision unit of the piston ring. CONSTITUTION: Structure of a piston ring comprises a piston(20) forming a ring groove to the upper part, a retainer(31) fitted into the ring groove, a first slide ring(40), and a second slide ring(42). In the first slide ring, the inner periphery of a fitting part(41) is elastically fitted into an upper groove(34) of the retainer. In the section of the outer periphery of contacting with the wall face of a cylinder liner(25), the longest diameter is formed to the lower side and the diameter of the outer periphery is getting smaller upwardly. The second slide ring is elastically fitted into a lower groove(35) of the retainer symmetrically to the first slide ring centering around a partition(32) of the retainer.
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