Piston ring

  • US 9,709,169 B2
  • Filed: 10/29/2012
  • Issued: 07/18/2017
  • Est. Priority Date: 10/31/2011
  • Status: Active Grant
First Claim
Patent Images

1. A piston ring having a resin-based film covering at least one of the upper and lower sides, wherein the resin-based film contains a fibrous filler with a mean fiber diameter of 50 to 500 nm and an aspect ratio of 30 to 500, whereinthe fibrous filler in the resin-based film is aligned at least roughly parallel to a surface of the resin-based film, anda ground layer roughness of the resin-based film is 1.0 to 6.0 μ

  • m, as a ten-point height of irregularities Rz. JIS.

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