Device for operating a clutch

The invention is based on a device for actuating a clutch ( 10 ), in particular for motor-vehicle drives, having an electronically controllable clutch servo unit ( 16 ) that comprises an electric motor ( 18, 52 ) and a reduction actuator gear ( 20 ) having two gear elements arranged coaxially in relation to each other ( 28, 38, 62 and/or 68, 82 and/or 96, 98 ) that are interconnected with each other in terms of propulsion via a thread ( 84, 86, 88 ) and that are displaced axially in relation to each other when they rotate relative to one another, whereby one of the gear elements ( 38, 68, 96 ) is immobilized axially in a housing ( 22, 58 ) of the clutch servo unit, and the actuating motion of the other gear element ( 28, 62, 82, 98 ) is transferred to a throwout bearing ( 42 ) of a clutch disk. It is proposed that the gear element ( 28, 62, 82, 98 ) that is axially displaceable relative to the housing ( 22, 58 ) is interconnected via a longitudinal guide ( 26, 66 ) with a rotor ( 56 ) or a motor shaft ( 24 ) of the electric motor ( 18 ) in a fashion that is torsion-resistant but axially displaceable, and acts on the throwout bearing ( 42 ) via an actuator ( 40, 74 ).