Piston blank, piston and method
AssigneeKS Kolbenschmidt GmbH
InventorsMatthias Laqua, Klaus Bacher
Life of this patent
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Abstract
Piston blank for a piston, comprising a piston lower part, which comprises a first joining surface running around a central axis of the piston blank, and a piston upper part, which comprises a second joining surface running around the central axis and an inner surface running around the central axis and adjoining the second joining surface as viewed along the central axis, wherein the piston upper part can be placed with its second joining surface on the first joining surface, and wherein a tangential plane which is assigned to the second joining surface is inclined relative to the central axis such that the tangential plane intersects the inner surface.
Claims14
A piston blank for a piston, comprising
- a piston lower part, which comprises a first joining surface running around a central axis of the piston blank, and
- a piston upper part, which comprises a second joining surface running around the central axis and an inner surface running around the central axis and adjoining the second joining surface as viewed along the central axis,
- wherein the piston upper part can be placed with its second joining surface on the first joining surface,
- wherein a tangential plane which is assigned to the second joining surface is inclined relative to the central axis such that the tangential plane intersects the inner surface, and
- wherein the inner surface is part of a wall of a cooling channel provided between the piston lower part and the piston upper part, and the tangential plane does not intersect the cooling channel.
A method for manufacturing a piston by means of a piston blank, comprising the following steps:
- a) providing the piston blank, which comprises a piston lower part, which comprises a first joining surface running around a central axis of the piston blank, and a piston upper part which comprises a second joining surface running around the central axis and an inner surface running around the central axis and adjoining the second joining surface as viewed along the central axis, wherein a tangential plane which is assigned to the second joining surface is inclined relative to the central axis in such a way that the tangential plane intersects the inner surface,
- b) placing the piston upper part with its second joining surface on the first joining surface, and
- c) welding the piston lower part to the piston upper part at the joining surfaces,
- wherein the inner surface is part of a wall of a cooling channel provided between the piston lower part and the piston upper part, wherein the tangential plane does not intersect the cooling channel.
Dependencies are inferred from the claim text.