PISTONS WITH COMBUSTION BOWL INSERTS

摘要

A piston for an internal combustion engine comprises a piston body (5) of aluminium or aluminium alloy and an insert (12) of a ferrous material having a combustion bowl (7) formed therein. The insert (12) is surrounded by the piston body (5) and the outer surface of the insert (12) and the adjacent surface of the piston body (5) are spaced apart at the crown ends thereof to form an annular gap (13) therebetween which opens onto the crown (6). This insulates the piston body (5) from the insert (12).