Rotation damper

A rotation damper, comprising:

• a unitary damper housing comprising an electromagnetic damper motor having a stator fixed to the damper housing and a rotor rotatably supported in the damper housing;
• a coupling lever connected with a second mass;
• a bearing shaft having a first end connected with the coupling lever for supporting the coupling lever in the rotation damper and a second end facing the damper motor with an axially extending bearing axle, with the axially extending bearing axle has a bore into which a threaded bolt engages, wherein a screw head of the threaded bolt is supported on the rotor so that a tightening of the threaded bolt results in an axial tensioning of the bearing shaft relative to a separate fastening part,
• with the separate fastening part surrounding the bearing shaft and indirectly fastened on the damper housing in rotative fixed relationship with the damper housing and adapted for fastening the damper housing to a first mass;
• a gear mechanism for transmitting and/or converting a relative rotational movement between the fastening part on the first mass and the coupling lever on the second mass to the electromagnetic damper motor for damping vibrations;
• and
• rolling bearings rotatably supporting the separate fastening part on the bearing shaft, a first one of said rolling bearings arranged between the bearing shaft and the separate fastening part, a second one of said rolling bearings arranged between the damper housing and the rotor, and a third one of said rolling bearings arranged between the rotor and the bearing shaft and rotatably supporting the rotor of the damper motor on the axially extending bearing axle.