Steel piston for an internal combustion engine
AssigneeFederal-Mogul Nurnberg GmbH
InventorRalf Meske
Life of this patent
Estimating the term…
Abstract
A steel piston (10) for an internal combustion engine includes a cooling cavity (20) extending in a rotationally symmetrical manner about the piston axis and at least three annular grooves (12, 14, 16), wherein the third annular groove (16), as viewed from the piston crown (18), has a greater depth (T3) than the depth (T2) of a second annular groove (14).
Claims17
A steel piston for an internal combustion engine comprising a cooling cavity extending in a rotationally symmetrical manner about the piston axis, the piston including a first annular groove, a second annular groove, a third annular groove, and no more than three annular grooves between a crown of the piston and a skirt of the piston, wherein the third annular groove, as viewed from the piston crown, has a greater depth than a depth of the first annular groove and a depth of the second annular groove, and wherein a welding bead or welding seam is present between the first annular groove and the third annular groove.
A steel piston for an internal combustion engine comprising a cooling cavity extending in a rotationally symmetrical manner about the piston axis and at least a first annular groove, a second annular groove, and a third annular groove, wherein the cooling cavity extends longitudinally along an entirety of a length of each of the annular grooves, wherein a minimum wall thickness between the third annular groove and the cooling cavity is smaller than a minimum wall thickness between the second annular groove and the cooling cavity and smaller than a minimum wall thickness between the first annular groove and the cooling cavity due to a local increase in the cross-section of the cooling cavity adjacent the third annular groove, and wherein each minimum wall thickness extends perpendicular to the piston axis from the respective annular groove to the cooling gallery, wherein a welding bead or weld seam is present between the first annular groove and the third annular groove.
Dependencies are inferred from the claim text.