Kolbenring und Verfahren zur Montage des Kolbenrings

摘要

The present invention provides a piston ring structural body (10) composed of an outer ring (20) continuously formed of a resinous material, an inner ring (30) continuously formed of a resinous material and a ring tensile force applying member (40) for pressing the outer ring radially outwards via the inner ring. The piston ring structural body (10) has a construction wherein the outer ring (20) continuously formed of polyimide is pressed outwards in the radial direction of the piston by a coil expander (40) via the inner ring (30) continuously formed of PTFE. A sliding face (24, 25) of the outer ring, which slides on a cylinder wall (200), is divided into upper and lower sliding faces, whose respective upper edge portions are provided with chamfers (26, 27). A contact portion of the inner ring that contacts the coil expander is provided with an upper inclined face (33) extending inwards and upwards and a lower inclined face (34) extending inwards and downwards. The angles of inclination of the upper and lower inclined faces range from 30 DEG to 60 DEG .