The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 18, 2003
Filed:
Apr. 18, 2001
Thomas Hannewald, Griesheim, DE;
Armin Seeger, Bad Soden, DE;
Rolf Oppermann, Schwalbach, DE;
Michael Haede, Schotten, DE;
Rüdiger Mörbe, Niedernhausen, DE;
Carlos Backes, Eppstein, DE;
Horst Schäfer, Sulzbach, DE;
Mannesmann VDO AG, Frankfurt, DE;
Abstract
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 ( ).