An actuator has a drive element and an output element each rotatable about a rotation axis, and a coupling device which couples the drive element to the output element to form a torsion backlash.
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1. An actuator, comprising: a drive element rotatable about a rotation axis;an output element rotatable about the rotation axis;a coupling device which couples the drive element to the output element to create a torsional force, the coupling device including a transmission element rotatably coupled
1. An actuator, comprising: a drive element rotatable about a rotation axis;an output element rotatable about the rotation axis;a coupling device which couples the drive element to the output element to create a torsional force, the coupling device including a transmission element rotatably coupled to the output element, and which is axially displaceable with respect to the output element between a rest position and an operating position in which the transmission element is rotatable about the rotation axis, wherein the transmission element is radially displaceable with respect to the drive element;a brake device, secured to a housing of the actuator, and which secures the transmission element against torsion in the rest position; anda resilient device which pretensions the transmission element into the rest position, and which applies a direct force between the output element, the transmission element, at least one roller member, and the drive element,wherein the coupling device is configured such that, starting from the rest position of the transmission element, by way of an initial rotation movement of the drive element, using a torsional backlash, the transmission element is displaceable into the operating position counter to the pretensioning by the resilient device, and after the transmission element reaches the operating position, the transmission element is configured to be driven by the drive element in a radial direction to carry out a rotation movement by way of an additional rotation movement of the drive element in order thereby to also drive the output element to carry out a rotation movement,wherein the resilient device is configured to provide a force between the output element and the transmission element. 2. The actuator of claim 1, wherein the coupling device comprises the at least one roller member through which the drive element cooperates with the transmission element during the initial rotation movement. 3. The actuator of claim 1, wherein the coupling device is configured such that the transmission element is repelled by the drive element counter to the resilient pretensioning during the initial rotation movement of the drive element. 4. The actuator of claim 1, wherein the coupling device has a redirection device which redirects the initial rotation movement of the drive element into an axial and/or radial movement of the transmission element. 5. The actuator of claim 4, wherein the redirection device comprises at least one ramp. 6. The actuator of claim 1, wherein the coupling device comprises at least one stop through which the drive element cooperates with the transmission element during the additional rotation movement. 7. The actuator of claim 1, wherein the coupling device is configured such that, after the additional rotation movement of the drive element ceased, the transmission element may be displaced back into the rest position by way of the resilient pretensioning. 8. The actuator of claim 1, wherein the coupling device is effective in different manners for various rotation directions of the drive element. 9. The actuator of claim 1, wherein the brake device is arranged in a stationary manner. 10. The actuator of claim 1, wherein the brake device comprises a friction device which has a conical operating face. 11. The actuator of claim 1, wherein the brake device comprises a friction device which has a flat operating face. 12. The actuator of claim 1, wherein the brake device comprises a positive-locking brake. 13. The actuator of claim 1, wherein the drive element and the output element are supported in an axially fixed manner. 14. The actuator of claim 13, wherein the output element comprises a shaft rotatably supported on the drive element. 15. The actuator of claim 1, wherein the output element comprises a shaft rotatably supported on the drive element. 16. The actuator of claim 1, wherein the transmission element is supported on the output element in an axially movable manner. 17. The actuator of claim 1, wherein: the resilient device comprises a spring and is configured to provide the force in an axial direction. 18. The actuator of claim 1, wherein the resilient device comprises a spring and is configured to provide a force in an axial direction. 19. The actuator of claim 1, wherein the drive element and/or the transmission element is formed as a shaped sheet metal component. 20. An actuator, comprising: a drive element rotatable about a rotation axis;an output element rotatable about the rotation axis;a coupling device to couple the drive element to the output element and which includes: a transmission element having an outer cone on an outer peripheral face thereof, and which is located in a rotationally secure and axially displaceable manner on the output element between a rest position in which the actuator is deactivated and the transmission element is secured against torsion, and an operating position in which the actuator is activated and the transmission element is at least axially moveable relative to the output element;at least one roller member positioned for guided movement between the transmission element the drive element in order to convert the rotational movement of the drive element into an axial movement and a radial movement of the transmission element,a resilient device which pretensions the transmission element into the rest position, and which applies a direct force between the output element, the transmission element, the at least one roller member, and the drive element; anda brake device having an inner cone which, in the rest position of the transmission element, engages the outer cone to secure the transmission element against torsion in the rest position.
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