Pistons with complex shaped piston crowns and manufacturing processes
AssigneeFederal-Mogul Corporation
InventorNorbert G. Schneider
Life of this patent
Estimating the term…
Abstract
A steel piston with an oil gallery, and process for forming a steel piston oil gallery channel, which corresponds to the complex shape of the combustion bowl in the piston crown. The piston crown is made by a cast metal or powder metal forming process. The oil gallery channel is formed to the basic shape that corresponds to the shape of the walls of the combustion bowl. Machine-turning surfaces in the oil gallery channel can be machine-finished as desired. Surfaces in the oil gallery which cannot be machined with conventional turning operations, such as recesses and protrusions into the channel, are left in the original as-formed condition.
Claims5
A piston comprising:
- a lower member, said lower member comprising sidewalk portions and pin bores;
- an upper crown member joined to said lower member, said upper crown member having a combustion bowl on an upper side thereof and an oil gallery recess on a lower side thereof, wherein said combustion bowl includes a plurality of radially inwardly or outwardly projecting protrusions spaced circumferentially from one another, and wherein said oil gallery recess includes machined portions and un machined portions.
Dependencies are inferred from the claim text.