Patent ID: 8156915

Claim:
A two piece piston for an internal combustion engine, the two piece piston comprising: a metal piston body portion having an outer cylindrical wall and an inner cylindrical wall defining a cylindrical bore, said outer cylindrical wall having a plurality of annular grooves for the receipt of piston rings, said inner wall having an annular groove; a ceramic/ceramic composite piston head of unitary construction, having an upper piston head crown, formed on a circumferential base complimentary with the circumference of said metal piston body, said circumferential complimentary base having depending there from a cylindrical disk member, the dimensions of which are complimentary with said cylindrical bore in said metal piston body, said depending cylindrical disk member having an annular groove formed thereabout; a locking ring secured about said annular groove of said depending cylindrical disk member, said locking ring engageable in said annular groove of said inner wall of said metal piston body when said ceramic/ceramic composite piston head is press fit into said metal piston body securing it thereto.