PISTON WITH COOLING GALLERY HAVING ENHANCED OIL INLET AND METHOD OF CONSTRUCTION THEREOF

摘要

A piston and method of construction thereof are provided. The piston includes an upper crown having an upper combustion surface and a lower crown depending therefrom. The lower crown includes a pair of laterally spaced, axially aligned pin bores configured for receipt of a wrist pin. A substantially closed, annular outer cooling gallery is formed between the upper and lower crowns, wherein a bottom surface of the cooling gallery is formed by a floor of the lower crown. An oil inlet and an oil outlet extend through the floor. The oil inlet includes an upstanding toroid-shaped protrusion that extends upwardly from the floor into the cooling gallery, wherein the protrusion is formed as a monolithic extrusion from the material of the lower crown floor.

主权项

1. A piston for an internal combustion engine, comprising:
an upper crown having an upper combustion surface with a generally cylindrical upper land, including a ring belt region, depending therefrom; a lower crown depending from the upper crown, the lower crown including a pair of laterally spaced, axially aligned pin bores configured for receipt of a wrist pin; a substantially closed, annular outer oil gallery formed between the upper and lower crowns, said gallery having a bottom surface formed by a floor of the lower crown; an oil inlet and an oil outlet extending through said floor, wherein said oil inlet includes an upstanding toroid-shaped protrusion that extends upwardly from said floor into the cooling gallery, wherein said protrusion is formed as a monolithic extrusion from the material of said floor.