Patent ID: 6055726
Filing Date: 2000-05-02
Classification: F01N,F01P,F02B,F02D,F02F,F02M,F05C,Y02T,Y10T

Abstract:
A method of forming a piston for an internal combustion engine from the group of materials consisting of aluminum and aluminum alloys, the piston being comprised of a head portion for forming in part a combustion chamber, the piston head portion having at least one piston ring groove for receiving a piston ring, a skirt portion below the head portion for slidably engaging an associated cylinder wall, and a piston pin boss formed below the head portion and at least in part inwardly of the skirt portion for connection by a piston pin to the small end of a connecting rod, said method comprising the steps of surface treating at least said head portion for increasing its hardness and reducing its heat conductivity for protection from excessive heating by treating the piston surface with an acid bath to dissolve surface silicon and subsequently performing an alumite treatment on the surface.