Patent ID: 6649111
Filing Date: 2003-11-18
Classification: F02D,F05C,Y10T

Abstract:
A method for producing a housing (12) for a throttle valve (10), which housing (12) has a throttle orifice (16) for a throttle valve (20), the housing (12) being produced from plastic (14) by an injection molding method, and, during the injection molding method, the plastic (14) being partially injected around a metal cylinder (28) whereby said metal cylinder provides dimensional stability and which, at least in a region of the throttle valve (20), an inner face of said metal cylinder forms the throttle orifice (16), wherein, 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), and, after the injection molding method, an outer circumference (80) of the expanding mandrel (50) is reduced to remove the expanding mandrel (50) from an interior (70) of the metal cylinder (28).