Butterfly flap reduction gear

A regulating flap reduction gear for an electrically driven regulating flap for regulating a gas or liquid volume flow, comprising:

• two parallel bearing plates, being a first bearing plate and a second bearing plate, between which rotary gear parts are rotatably arranged;
• and
• a plurality of spacers which keep the two parallel bearing plates at a distance from one another;
• wherein the plurality of spacers are designed as tabs of one, the first bearing plate, which are bent by 90° from the plane of the first bearing plate and comprise at least one lateral projection, and the tabs are inserted with their free tab ends into plug-in openings of the second bearing plate until their at least one lateral projection rests against the second bearing plate;
• and
• wherein one of the rotary gear parts is a pivotable gear part that can be pivoted between two end positions and rests against one of the tabs in at least one of its two end positions, the first bearing plate comprises a bearing opening for the pivotable gear part and is reinforced around the bearing opening in a region of that tab against which the pivotable gear part rests in its end position, and the first bearing plate is reinforced, in a region of that tab against which the pivotable gear part rests, by a bulge that radially inwardly projects into the bearing opening.