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Cylinder liner for an opposed-piston engine

  • US 9,845,764 B2
  • Filed: 03/31/2015
  • Issued: 12/19/2017
  • Est. Priority Date: 03/31/2015
  • Status: Active Grant
First Claim
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1. A cylinder liner for an opposed-piston engine, comprising:

  • a cylindrical wall with an interior surface defining a bore centered on a longitudinal axis of the liner, the bore having a first diameter relative to the longitudinal axis;

    intake and exhaust ports formed in the cylindrical wall near respective opposite ends of the liner;

    an intermediate portion of the liner extending between the ends and including an annular liner portion containing piston top center (TC) locations;

    the annular liner portion defined between first and second top ring reversal planes extending orthogonally to the longitudinal axis, in which the first top ring reversal plane is at a first axial position where the topmost ring of a first piston is located when the piston is at its TC location, and the second top ring reversal plane is at a second axial position where the topmost ring of a second piston is located when the piston is at its TC location;

    an annular groove in a portion of the bore in the annular liner portion; and

    ,a liner ring seated in the annular groove, in which the liner ring has an interior annular surface with a second diameter relative to the longitudinal axis that is less than the first diameter;

    wherein;

    grooves on an outer annular surface of the liner ring that form one or more air resistors with the bore which act between the liner ring and the bore; and

    ,the liner ring is formed from a material having a first thermal resistance and the cylinder liner is formed from a material having a second thermal resistance less than the first thermal resistance.

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