Robert Boschgmbh

Peter Baur

Erwin Krimmer

Christian Lorenz

Klaus Kaiser

Bruno Hezel

Ralph Krause

Hubert Hickl

The invention relates to a method for producing a throttle valve unit for installation into a flow conduit through which a gas flow passes. A flap shaft of the throttle valve unit is affixed to a stamped insert part inside a fastening region. The stamped insert part, which includes an insert border, is molded into a housing. At the same time as the stamped insert part is molded into the housing, the flap shaft affixed to the stamped insert part is molded-in inside the fastening region. A planar region of the stamped insert part connected to the flap shaft is cut out from this stamped insert part.

Butterfly valve with injection-molded shaft

In a flap valve for controlling a gas flow, with a valve tube ( ) that carries the gas flow and with a valve flap ( ) that is pivotable in the valve tube ( ) and that in its closing position rests sealingly with its outer contour on the inner wall of a flexible thin-walled tube ( ) disposed coaxially in the valve tube ( ), and with a valve shaft ( ) connected to the valve flap ( ) in a manner fixed against relative rotation, it is provided, in order to attain a sensitive adjustment of the valve flap ( ) and for the sake of technologically simple, inexpensive production of the flap valve ( ), that the valve shaft ( ) is positioned at an acute angle (&ggr;) relative to the valve plane, and the thin-walled tube ( ) is formed directly and integrally onto the valve tube ( ) (FIG. ).

Flap valve

Growing community of inventors

Waiblingen, Germany

Peter Baur