Patent ID: 7559555
Filing Date: 2009-07-14
Classification: B29C,B29L,F16J

Abstract:
1. A resin oil sealing ring for a hydraulic mechanism, said resin oil sealing ring having a circumference of 360° and having two abutments confronting each other, said two abutments being located in a first region on said circumference at a first point on said circumference designated as 180°, said first point being located opposite a second point located at a midpoint of a second region on said circumference, said second point being designated as 0° on said circumference of said resin sealing ring; said first and second regions being spaced apart from one another on said circumference to define two other portions of said circumference located between each of said first and second regions, said second region having a circumference within a range of 5° to 30° along said circumference on each side of said second point designated as 0° on said circumference of said resin sealing ring; said two other portions each containing a portion that has a smaller thickness around said circumference of said resin sealing ring as compared to thicknesses of said first and second regions, and said portion that has the smaller thickness having a circumference of 20° to 130°.