Patent ID: 6240827
Filing Date: 2001-06-05
Classification: B21C,B21K,F02F,F05C

Abstract:
A composite piston for a reciprocating machine comprised of a pair of dissimilar materials affixed to each other solely through bonding by a forging process, one of said materials having a property having characteristics selected from the group of strength and abrasion resistance that is substantially greater than that of the other of said materials and comprised of aluminum alloyed with iron (Fe) having a particle diameter not greater than 10 .mu.m, said piston being comprised of a head portion having an upper surface adapted to experience pressure and a peripheral ring groove portion for receiving at least one sealing ring below said upper surface, a skirt portion comprised of at least a pair of surfaces for sliding engagement with a cylinder bore formed below said head portion, and a pair of piston pin bosses having piston pin receiving openings for connection to a connecting rod small end by a piston pin, said piston pin bosses being formed between circumferentially spaced portions of said skirt portion surfaces, said one material forming at least a portion of the outer surface of said piston in an area extending at least in part across portions of said piston pin receiving opening that are engaged by the piston pin.