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Cylinder bore with selective surface treatment and method of making the same

  • US 8,726,874 B2
  • Filed: 05/01/2012
  • Issued: 05/20/2014
  • Est. Priority Date: 05/01/2012
  • Status: Active Grant
First Claim
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1. A cylinder bore having a longitudinal axis and a cylindrical wall extending along the longitudinal axis, the cylindrical wall comprising:

  • a first end portions having a first diameter; and

    a middle portion axially adjacent to the first end portion, the middle portion having a second diameter greater than the first diameter and a plurality of parallel, alternating teeth and grooves formed therein to provide a surface roughness of the middle portion greater than a surface roughness of the first end portion.

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