Daimler Chrysler Ag

Mercedes-benz Aktiengesellschaft

Pavel Hora

Martin Schlegl

Karl-Heinz Thiemann

Volker Keck

Walter Conradt

In a composite lightweight valve for internal combustion engines having a solid valve head provided with a center opening and a valve stem received in the center opening of the valve head in a positively locking manner, the valve components are permanently joined to one another by hot upsetting so as to be capable of withstanding the thermal and mechanical effective during engine operation.

Composite lightweight valve for internal combustion engines

A process for the production of a valve, in particular a charge cycle valve of an internal-combustion engine, having a separately produced hollow valve shank with a widening shank section arranged at the valve-side end, which is connected to a valve disk of highly heat resistant material. The valve shank is produced from a tubular starting material by cold forming to the shank diameter, and subsequently a transitional region lying between reduced valve shank and starting material is shaped as a shank section widening in the form of an arc. The valve shank is severed at the widening shank section at a point corresponding to the diameter of the point of connection between valve disk and valve shank.

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Kornwestheim, Germany

Pavel Hora