Abstract: A gear wheel includes precisely two teeth. The gear wheel is mounted rotatably about a gear wheel axis and wherein, in a sectional plane arranged orthogonally to the gear wheel axis, the gear wheel has a cross-sectional surface, which is intersected in its geometric center by the gear wheel axis (12), which has in the region of both teeth (10a, 10b) its maximum extension (dmax) through the geometric center and which, offset in the circumferential direction with respect to the direction of maximum extension, has its minimum extension (dmin). The outer contour of the cross-sectional surface is formed convexly over the entire circumference.