Patent ID: 8474366

Claim:
A piston, comprising: a piston body having an upper crown portion extending along a central axis along which the piston reciprocates; 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 with opposite side edges extending to a free end and having a recessed slot extending radially into said convex outer surface to a recessed surface, said recessed surface separating an upper band section of said convex outer surface from a lower band section of said convex outer surface, wherein said recessed slots have upper and lower edges extending generally transverse to said central axis, each of said upper and lower edges have a radius of curvature extending from said convex outer surface toward said recessed surface, wherein said radius of curvature is parabolic.