ONE PIECE CAST FERROUS CROWN PISTON FOR INTERNAL COMBUSTION ENGINE
A one-piece piston having an investment or other permanent or non-permanent mold/die precision cast piston crown, rod flange and piston skirt. The piston crown has a relative constant thickness, a flange requiring minimal machining and a skirt providing for a wall with a support against the angular shifting of the piston. This improves the distribution of heat within such crown and the angular stability of the piston wall at the piston rod connection.
1 . A piston designed for reciprocatable movement within a combustion chamber of an internal combustion engine, said piston comprising a piston crown with an integral piston skirt and two rod connecting flanges precision cast of high-strength ferrous material net to finished dimensions on all inner and outer surfaces to provide a controlled thickness throughout to ensure mechanical and thermal consistency with only secondary finishing of an outer cylindrical surface of the crown, outer edges of the rod connecting flanges, a rod connection bearing seat, and a top surface of the crown.
2 . The piston of claim 1 wherein said rod connection flanges extend off of an inner surface of said crown, each said rod connection flanges having a lower end, each of said rod connection flanges being either tapered from said inner surface of said crown to a reduced section at said lower end, or parallel to the axis of a connecting rod.
3 . The piston of claim 1 wherein the crown has a circumferentially interrupted lower surface comprising two equal and directly opposing arcuate sections parallel to the vertical axis of the piston, each of said sections being of a controlled thickness throughout to ensure mechanical and thermal consistency.
4 - 9 . (canceled)