Flap device for an internal combustion engine

A flap device for an internal combustion engine, the flap device comprising:

• a flow housing comprising a flow channel;
• an actuating shaft;
• a flap body arranged on the actuating shaft in the flow channel;
• a bore comprising a shoulder, the bore being arranged in the flow housing and being configured to have the actuating shaft protrude therethrough to an exterior of the bore;
• a first bearing bush arranged in the bore, the first bearing bush being configured to have the actuating shaft be mounted therein;
• a closure bush;
• a slide ring comprising a slide ring radially inner portion;
• and
• a sealing element configured to radially surround the actuating shaft, the sealing element comprising an annular metal membrane which comprises an annular metal membrane radially inner portion and an annular metal membrane radially outer portion,
• wherein,
• the annular metal membrane radially outer portion is clamped axially between the closure bush and the shoulder of the bore so as to form a contact surface on the bore of the flow housing, and
• the annular metal membrane radially inner portion rests against the slide ring radially inner portion so as to form a mating surface, the mating surface being arranged closer to the flow channel than to the contact surface.