Piston ring structural body and method of mounting the piston ring structural body
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United States of America Patent
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Sep 4, 2001
Grant Date -
N/A
app pub date -
Feb 4, 1999
filing date -
Feb 20, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention provides a piston ring structural body composed of an outer ring continuously formed of a resinous material, an inner ring continuously formed of a resinous material and a ring tensile force applying member for pressing the outer ring radially outwards via the inner ring. The piston ring structural body has a construction wherein the outer ring continuously formed of polyimide is pressed outwards in the radial direction of the piston by a coil expander via the inner ring continuously formed of PTFE. A sliding face of the outer ring, which slides on a cylinder wall, is divided into upper and lower sliding faces, whose respective upper edge portions are provided with chamfers. A contact portion of the inner ring that contacts the coil expander is provided with an upper inclined face extending inwards and upwards and a lower inclined face extending inwards and downwards. The angles of inclination of the upper and lower inclined faces range from 30.degree. to 60.degree..
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