• US 20090026711A1
  • Filed: 07/21/2008
  • Published: 01/29/2009
  • Est. Priority Date: 07/27/2007
  • Status: Abandoned Application
First Claim
Patent Images

1. A compression piston ring in a form of a generally circular shape and having an outer peripheral surface in sliding contact with a cylinder, an inner peripheral surface in confrontation with a piston, and a pair of end faces splitting the circular shape in a radial direction thereof for defining a gap portion, the compression piston ring having a first portion including a notched portion formed at the inner peripheral surface and extending over a predetermined circumferential length portion starting from the end face, and a second portion other than the first portion, the second portion having a radial thickness ranging from 2.0 mm to 6.0 mm, and the first portion having a radial thickness smaller than that of the second portion;

  • wherein the notched portion is a plane shape gradually reaching the outer peripheral surface toward the end face, andwherein the end face has a radial thickness ranging from 0.2 times to less than 0.5 times as large as the radial thickness of the second portion; and

    wherein the outer peripheral surface defines a center serving as a center of a center angle, and the predetermined circumferential length portion being defined by the center angle ranging from 26.5 degrees to 14 degrees.

View all claims

    Thank you for your feedback