Piston cooling gallery shaping to reduce piston temperature
AssigneeTenneco Inc.
InventorsEduardo Matsuo, Gregory Rudzik
Life of this patent
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Abstract
A piston for an internal combustion engine is provided. The piston includes a lower part joined to an upper part, for example by friction welding with inertia. The upper part presents a combustion surface and an undercrown surface. The piston also includes a cooling gallery surface provided by the upper part and the lower part. The cooling gallery surface surrounds a volume of space for containing a cooling media. The piston can include serrations in the cooling gallery surface and/or undercrown surface to increase surface area and thus reduce the temperature of the piston. The piston can also include shaped weld curls, instead of or in addition to the serrations, which also increase surface area and reduce the temperature of the piston.
Claims19
A piston for an internal combustion engine, comprising:
- a body formed of a metal material,
- said body presenting a combustion surface and an undercrown surface,
- said body including a cooling gallery surface surrounding a volume of space which extends circumferentially around said undercrown surface,
- said body including a plurality of serrations formed in said cooling gallery surface and/or said undercrown surface, each serration including a base surface which presents a concave shape, and said base surface being 1 to 3 mm deep relative to said cooling gallery surface and/or said undercrown surface.
A method of manufacturing a piston for an internal combustion engine, comprising the steps of:
- providing a body formed of a metal material, the body including an upper part presenting a combustion surface and an undercrown surface, the body including a cooling gallery surface surrounding a volume of space which extends around the undercrown surface, and
- forming a plurality of serrations in the cooling gallery surface and/or the undercrown surface, each serration including a base surface which presents a concave shape, and the base surface is 1 to 3 mm deep relative to the cooling gallery surface and/or the undercrown surface.
A piston for an internal combustion engine, comprising:
- a body formed of a metal material;
- said body including a lower part joined to an upper part by a weld, said an upper part presenting a combustion surface and an undercrown surface;
- said body including weld curls along said weld, said weld curls being shaped;
- said body including a cooling gallery surface surrounding a volume of space which extends circumferentially around said undercrown surface;
- and
- and said body including a plurality of serrations formed in said cooling gallery surface and/or said undercrown surface.
A method of manufacturing a piston for an internal combustion engine, comprising the steps of:
- welding a lower part formed of metal material to an upper part formed of metal material,
- the welding step including forming weld curls along the weld, and
- shaping the weld curls.
Dependencies are inferred from the claim text.