Suspension actuator

Suspension actuator for positioning a movably mounted component of a vehicle suspension, comprising a first actuator component connected to the movably mounted component and a second actuator component connected to a fixed suspension component, wherein both of the actuator components can be adjusted relative to each other in an axial direction by a ball-type screw drive comprising a threaded spindle and a nut running on the threaded spindle, wherein either the nut can be driven by a drive motor for an axial adjustment of the threaded spindle or the spindle can be driven by the drive motor for an axial adjustment of the nut, a brake unit is provided that is activatable by an external, suspension-side force acting on the nut or the spindle and rotating the nut or the spindle and the brake unit builds up a friction moment acting against a nut rotation or a spindle rotation, the brake unit includes a helical wrap-spring having two angled spring ends, with an opening element that can be rotated in either direction by the drive motor for opening the spring wrap and a closing element locked in rotation directly or indirectly with the nut or the spindle for closing the spring wrap connected to the angled spring ends, with the friction moment acting between the nut or the spindle and a first stationary actuator element or between a drive shaft of the drive motor and a second stationary actuator element allocated to the drive motor.