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US 10,610,984 B2Granted
Piston and method of making a piston
AssigneeTenneco Inc.
InventorsAirton Martins, Carmo Ribeiro
Life of this patent
Estimating the term…
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.
Claims5
A method of making a piston comprising the steps of:
- preparing a single piece upper crown member of cast steel having a top surface, a combustion bowl recessed in said top surface and an undercrown opposite the combustion bowl, wherein the combustion bowl and the undercrown has a final finish form that is produced by casting;
- preparing a lower crown member as a discrete component separate from the upper crown member;
- joining the upper and lower crown members together;
- machining at least a portion of said joined upper and lower crown members other than said undercrown and said combustion bowl;
- and
- wherein the combustion bowl includes at least one irregularity spaced radially from a central axis and extending less than circumferentially around the central axis.
3 more elements
Dependencies are inferred from the claim text.