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AssigneeLean-Burn Combustion, Inc.
InventorsMichael Ira Keller, Andrew E. Meyer, William R. Bandy, Sidney Lynn Reed
Estimating the term…
An automotive internal combustion engine piston is formed to have a bowl in the piston crown, at least one micro chamber formed in a side surface of the piston body at a position lower than a floor of the bowl, and extended orifices to provide 2-way communication of gaseous materials between the micro chambers and bowl. The micro chamber volume is defined by a removable casting core that incorporates a strut to secure the core at the circumference of the piston body in the casting mold. Subsequent to casting and removal of the core material, the cavity from the strut to secure the core is prepared to receive a tapered thread plug that is sealed by circumferential friction stir welding on the outer diameter of the piston body. The micro chamber is thereby isolated except for the extended orifice to the bowl.
A method of forming a piston for an internal combustion engine having a piston crown and piston body in which is formed at least one micro chamber for creating and supplying auto-ignition radicals from a hydrocarbon fuel to a combustion zone defined by the piston crown containing a bowl formed by a depression in the piston crown and a top side area surrounding the bowl, the method comprising the steps of:
Dependencies are inferred from the claim text.