Loading patent…
AssigneeEaton Corporation
InventorsDavid Genise, Suzanne Zampaloni, Andrew Harman, Michael Zampaloni, Farhang Pourboghrat
Estimating the term…
A cylinder head (10) for an internal combustion engine has hydroformed port liners (18) positioned within selected ports, either exhaust and/or intake ports (14, 16). The hydroformed port liner (18) includes an air gap (24) for an insulation layer within the selected port (14, 16) between an outer surface (19) of the hydroformed port liner (18) and the wall of the port (14, 16). A cylinder head (12) with a predetermined port configuration has selected ports (14, 16) cast with protrusions (22). The selected ports (14,16) have a larger diameter than a standard size port diameter for that cylinder head to provide a predetermined port configuration by a preset amount based on the thickness of the hydroformed port liner (18) and a desired air gap (22). Protrusions (22) in the wall of the selected ports (14, 16) or on the insert sleeves (17) facilitate formation of the air gap during the hydroforming process.
In a cylinder head having at least one port situated therein and a port liner disposed within the at least one port in an arrangement that forms an air gap between an outer surface of the port liner and a wall of the at least one port, the improvement comprises, a hydroformed port liner disposed in said at least one port for forming a double walled port, said hydroformed port liner being situated within said at least one port in an arrangement in which at least a substantial portion of said outer surface of the port liner is disposed apart from the wall of said at least one port to provide said air gap disposed between the wall of said at least one port and said outer surface of said hydroformed port liner for forming an insulation layer.
A method for making an improved cylinder head having a predetermined port configuration with selected double walled ports for an internal combustion engine, comprising the steps of:
In a conventional cast cylinder head for an internal combustion engine having a predetermined port configuration, the improvement comprises a cast cylinder head with hydroformed port liners in selected ports, each hydroformed port liner forming an air gap between the hydroformed port liner and a wall of the port while maintaining the predetermined port configuration in the selected ports.
A method for forming a double walled port in a cylinder head, comprising the steps of:
Dependencies are inferred from the claim text.