Multi-rail piston ring
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United States of America Patent
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Mar 26, 2013
Grant Date -
Jul 8, 2010
app pub date -
Jan 7, 2009
filing date -
Jan 7, 2009
priority date (Note) -
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Abstract
A piston ring assembly includes a ring or rail defining a seal surface configured to seal against a piston bore surface of an engine. The seal surface defines a radially outer periphery. The oil control rail assembly further includes two positioning rings. A first one of the positioning rings is disposed axially above the oil control rail and a second one of the positioning rings is disposed axially below the oil control rail. Each of the positioning rings defines an outermost periphery of the positioning ring that is disposed radially inward with respect to the seal surface of the oil control rail. The outermost peripheries of the positioning rings thus generally do not contact a bore surface that is contacted by the seal surface of the oil control rail.
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