Abstract: A tooth profile in a meshing mechanism is arranged in such a way that the tooth profile of a deflectable tooth row is formed by a circular-arc-shaped addendum and lines tangential to the circular arc, while the tooth profile of two second tooth rows meshing with the tooth row with that tooth profile, one of the second tooth rows being fixed and the other being moveable, are based on an envelope of the locus of movement of the circular-arc-shaped addendum, or a line approximated thereto by circular arcs and straight lines. In the meshing mechanism having this tooth profile, the deflectable tooth row and the two tooth rows mesh with each other over a wide region and a low level of angular backlash can be obtained thereby. For this reason, the contact pressure on the working surfaces of the teeth can be alleviated, and the lifetime of the teeth can be prolonged.