Piston for internal combustion engines
AssigneeKS Kolbenschmidt GmbH
InventorsVolker Gniesmer, Emmerich Ottliczky, Gunter Bayer
Life of this patent
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Abstract
A piston of an internal combustion engine, includes a piston upper part and a piston lower part which are supported via corresponding joining webs, in each case forming a joining zone connected in a material-to-material manner by means of a multi-orbital rotary friction weld. The joining webs and which are in each case directly connected have a wall thickness S1, S2 which is identical as far as possible. The piston encloses a combustion-chamber recess and at least one cooling duct which are made centrally or eccentrically in the piston. The combustion chamber recess and the cooling duct form a circular contour or a contour which deviates from a circular shape.
Claims12
A piston for an internal combustion engine that is designed as a single-piece piston including a combustion chamber recess and at least one cooling duct, the piston having a piston upper part and a piston lower part that are supported by matching joining webs connected material-to-material using multi-orbital friction welding, comprising:
- the combustion chamber recess and/or the cooling duct located one of centrically or eccentrically in the piston and have one of an identically circular shape or a form deviating from a circular form, where the piston upper part and the piston lower part are supported by the joining webs of at least approximately the same wall thickness.
A method for producing a piston for an internal combustion engine comprising:
- producing a piston upper part and a piston lower part as one of forged or cast blanks;
- pre-machining the piston upper part and the piston lower part that includes introducing a combustion chamber recess and a cooling duct following its contour;
- using multi-orbital friction welding to connect joining webs of the piston upper part and the piston lower part that are supported by joining zones;
- and
- final machining of the piston.
Dependencies are inferred from the claim text.