Patent ID: 8042453
Filing Date: 2011-10-25
Classification: F02F,F16J

Abstract:
1. A piston, comprising: a piston body having an upper crown portion; a pair of pin bosses depending from said upper crown and having pin bores aligned with one another along a pin bore axis; and a pair of skirt portions arranged on opposite sides of said pin bore axis, each of said skirt portions having a convex outer surface and an inner surface facing a cavity with an opening providing fluid communication between said outer surface and said cavity, said openings providing said convex outer surfaces of said skirt portions with a circumferentially extending upper band portion above a horizontal plane extending through said pin bore axis and a circumferentially extending convex lower band portion below said horizontal plane, said openings having peripheral upper and lower edges and peripheral side edges, at least one of said upper and lower edges having a parabolic radius of curvature extending from said convex outer surface inwardly toward said cavity.