Axial setting device with spring-supported return

An axial setting device comprising:

• two discs (24, 29) which are rotatable relative to one another, which are supported coaxially relative to one another in a housing (102) and between which there are guided balls (35) in pairs of ball grooves (34, 39) whose depth varies across the circumference, one of the discs (24, 29) is axially supported and the other one of the discs (24, 29) is axially displaceable against elastic returning forces of a first spring (33), and one of the discs (24) can be rotatingly driven by a motor (11) via a gear drive, whereas the other one of the discs (29) is supported in the housing (102) with respect to rotation;
• and
• a second spring (66) which is inserted between the housing (102) and the disc (29) supported with respect to rotation which, during the return movement of the drivable disc (24), after the balls (35) have reached their end position defined by end stops in the ball grooves (34, 39), permits overshooting of the drivable disc (24) together with the disc (29) supported with respect to rotation against elastic returning farces of the second spring (66);
• wherein the rotatingly drivable disc (24) is the disc which is axially displaceable against the returning forces of the first spring (33) and wherein the disc (29) supported with respect to rotation is the disc which is axially supported in the housing (102).