an axial adjusting device includes two discs which are rotatable relative to one another and coaxially supported relative to one another , between which two discs balls are guided in pairs of ball grooves . the depth of the pairs of ball grooves is variable across the circumference of the discs . one of the discs is axially supported and one is axially displaceable against resilient returning forces of a first spring mechanism . at least one of the discs can be driven by a motor via a gear drive . a second spring mechanism is provided which — during the return motion of the discs , after the balls have reached their end positions in the ball grooves , which end positions are determined by the greatest groove depth — permit the drivable disc to overshoot against the resilient returning forces of the second spring mechanism .