Patent ID: 6032570
Filing Date: 2000-03-07
Classification: B21C,B21K,B23P,F02F,F05C,F16J

Abstract:
A composite piston for a reciprocating machine comprised of a pair of dissimilar materials bonded together 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, 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 first material formiing at least a portion of the outer surface of said piston in an area extending from the top part of said head portion to an area below the upper edges of said piston pin receiving openings around the complete circumference of said piston.