Mannesmann Vdo Ag

Michael Haede

Thomas Hannewald

Rolf Oppermann

Armin Seeger

Carlos Backes

R&uuml;diger M&ouml;rbe

Horst Sch&auml;fer

The invention relates to a method for producing a housing ( ) for a throttle valve connection piece ( ), which housing is to have particularly high dimensional stability. For this purpose, the housing ( ), which has a throttle orifice ( ) for a throttle valve ( ), is produced from plastic ( ) by the injection molding method, plastic ( ) being partially injected around a metal cylinder ( ) which, at least in the region of the throttle valve ( ), forms the throttle orifice ( ). In this case, before the injection molding method, an expanding mandrel ( ) is expanded against the inner face ( ) of the metal cylinder ( ). During the injection molding method, the inner face ( ) of the metal cylinder ( ) is supported at least partially by the expanding mandrel ( ). After the injection molding method, a reduction in the outer circumference ( ) of the expanding mandrel ( ) is carried out in order to remove the expanding mandrel ( ) from the interior ( ) of the metal cylinder ( ).

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Schotten, Germany

Michael Haede