Patent ID: 6427579
Filing Date: 2002-08-06
Classification: B22D,F02B,F02F,F05C,Y02T,Y10T

Abstract:
A piston of an internal combustion engine, comprising:a crown constructed of an aluminum alloy and having a bowl at a top surface thereof, said bowl serving as a combustion chamber; boss portions projected downward from said crown, said boss portions having aligned piston pin holes respectively, said aligned piston pin holes having a common first axis; and a generally annular reinforced zone provided on the top surface of said crown and extending around a peripheral edge of said bowl, wherein the mechanical strength of said reinforced zone gradually lowers as the distance from said first axis of said piston pin holes increases and wherein said generally annular reinforced zone is provided by fusing a fusible ring put on the crown top surface and a part of a base material of the piston, said fusible ring containing reinforcing materials.