Control diaphragm for diaphragm carburetors

A control diaphragm for controlling a fuel feed in a diaphragm carburetor of an internal combustion engine, the carburetor having a controlling lever, the control diaphragm comprising:

• a central, substantially flat sensing region having a functional region extending concentrically around the sensing region and a peripheral fastening border for fastening the control diaphragm in the diaphragm carburetor;
• the control diaphragm closing, in the installed state, a control chamber of the diaphragm carburetor in a sealing manner;
• the central sensing region of the control diaphragm functionally connected to the controlling lever of the diaphragm carburetor, which is arranged in the control chamber and senses the axial deflection of the sensing region in dependence on an operational pressure change in the control chamber;
• the control diaphragm consists of a thermally stable and fuel-resistant, non-elastomeric plastic film with uniform thickness, in which a plurality of concentric corrugations forming the functional region are arranged such that the axial deflection of the sensing region in dependence on the operational pressure change in the control chamber progresses in accordance with a predefined displacement/pressure characteristic, the diaphragm not including a separate reinforcing plate.