Method for producing a housing for a throttle valve connection piece

US6649111B2 · kind B2 · utility

Assignee

• Mannesmann VDO AG · DE

Inventors

• 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 Schafer · Aschaffenburg, DE

Key dates

• Filing date: Apr 18, 2001
• Grant date: Nov 18, 2003
• Expiry date: Apr 18, 2021

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/0525
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

The invention relates to a method for producing a housing (12) for a throttle valve connection piece (10), which housing is to have particularly high dimensional stability. For this purpose, the housing (12), which has a throttle orifice (16) for a throttle valve (20), is produced from plastic (14) by the injection molding method, plastic (14) being partially injected around a metal cylinder (28) which, at least in the region of the throttle valve (20), forms the throttle orifice (16). In this case, before the injection molding method, an expanding mandrel (50) is expanded against the inner face (33) of the metal cylinder (28). During the injection molding method, the inner face (33) of the metal cylinder (28) is supported at least partially by the expanding mandrel (50). After the injection molding method, a reduction in the outer circumference (80) of the expanding mandrel (50) is carried out in order to remove the expanding mandrel (50) from the interior (70) of the metal cylinder (28).