Method for producing a hollow valve with an optimised interior stem geometry for internal combustion engines

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United States of America Patent

PATENT NO 11732622
APP PUB NO 20210199029A1
SERIAL NO

17057469

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Abstract

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A method for producing a valve body of a hollow valve with optimised interior stem geometry includes a preform with a valve plate and a tubular wall surrounding a cavity. Flow forming the tubular wall over a flow-forming mandrel, which is inserted into the cavity to enlarge a length of the tubular wall. An interior area of the tubular wall is embossed with a structure either due to the fact that the flow-forming mandrel is a structuring mandrel having a surface structure, or alternatively, because the method includes a further step of reducing an outer diameter of the tubular wall by swaging or drawing and ironing over a structuring mandrel. Furthermore, a hollow valve is produced by this method.

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Patent Owner(s)

Patent OwnerAddress
FEDERAL-MOGUL VALVETRAIN GMBH30890 BARSINGHAUSEN

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Bayard, Guido Dortmund, DE 17 13
Matthais, Thorsten Garbsen, DE 1 0
Wolking, Antonius Barsinghausen, DE 17 13

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