Actuator having a planetary roller screw drive

An actuator having a planetary roller screw drive, the actuator comprising:

• a housing having a cylinder chamber, a piston having a seal with a moving sealing lip supported on a wall of the cylinder chamber, and a fluid reservoir, wherein the fluid reservoir and the cylinder chamber form one common volume and the housing is filled with a hydraulic fluid and the planetary roller screw drive comprises a spindle having a profiling, the profiling meshing with a plurality of planetary rollers arranged around the spindle axially parallel to the spindle and each of the plurality of planetary rollers is supported in a respective recess of a planetary roller carrier, wherein the piston is fixed to an end of the spindle, wherein the plurality of planetary rollers mesh with an inner profiling of an internal ring gear surrounding the plurality of planetary rollers, and wherein the plurality of planetary rollers are supported in a sleeve surrounding the internal ring gear, the planetary roller carrier including one or more flow ducts-connecting an interior and an exterior of a chamber defined radially by the sleeve and axially by the planetary roller carrier, the planetary roller carrier includes recesses configured to receive rotational braces extending from the sleeve.