Piston and method of making a piston
AssigneeFederal-Mogul Corporation
InventorsAIRTON MARTINS, CARMO RIBEIRO
Life of this patent
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Abstract
A one-piece piston including a combustion bowl which is cast to its final form and includes at least one irregularity spaced from a central axis. The piston is initially fabricated of an upper crown member and a lower crown member, which are joined together. The piston is then chucked into a machine tool, such as a CNC lathe, which locates either the piston's top surface or a portion of the combustion bowl and establishes its location as a datum plane. It is this datum plane which serves as a reference location for subsequent machining operations of the piston.
Claims9
A method of making a piston comprising the steps of:
- preparing a single piece upper crown member of steel having a top surface and a combustion bowl recessed in said top surface, wherein the combustion bowl has a final finish form that is produced by other than machining;
- preparing a lower crown member as a discrete component separate from the upper crown member;
- joining the upper and lower crown members together;
- and
- machining at least a portion of said jointed upper and lower crown members other than said combustion bowl.
The method of claim wherein the final finish form of the combustion bowl is produced by casting.
Dependencies are inferred from the claim text.