Abstract: A fluid friction coupling comprises a coupling hub (1) and a coupling housing (2) rotatably supported on the coupling hub. The coupling also comprises sets of plates (6; 7) non-rotatably mounted on the hub and housing. One set of plates has spacing teeth (8) which, while eliminating the previously used spacer rings, permit accurate spacing of the set of plates. A predetermined number of spacing teeth (8) of the axially immovable plates (7) are bent out of the plane of the respective plate so as to be Z-shaped with both bending angles approximately 90 degrees. This measure ensures that the plates for a friction coupling are designed in such a way that they are accurately spaced at predetermined distances and that they are suitable for automatic assembly purposes.

Abstract: A coupling flange on a torque transmitting shaft or the like for coupling in face-to-face relationship with a counter-flange has at least two tooth systems on its coupling surface and each system comprising a plurality of substantially parallel axially projecting teeth having inclined flanks. At least one tooth in each tooth system has a different height, spacing or shape from the other teeth in the tooth system and the tooth systems are engagable with a complementary configuration on the counter-flange so as to connect nonrotatably the flanges.