Patent ID: 6886679

Claim:
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 ).