| 摘要 |
The invention relates to a coupling unit having a viscous coupling A and a friction coupling B. The coupling housing 29 of the friction coupling B is connected to the input and the hub 12 of the viscous coupling A to the output. Between the end face of the housing 17 of the viscous coupling A and the end face of the pressure plate 28 of the friction coupling B there are provided setting means 27 in the form of ramps. Up to a predetermined torque value, the torque is transmitted from the coupling housing 29 to the hub 12, i.e. it is transmitted only by the viscous coupling A to the hub 12 and the plug-in shaft connected thereto, and after the predetermined torque has been exceeded, torque is additionally transmitted by the friction coupling B via the coupling hub 48 to the plug-in shaft also connected to the latter. By associating the setting means with the end faces at the housing 17 and pressure plate 28 it is ensured that when using such coupling units in motor vehicles for at least partially blocking the functions of an axle differential, it is possible to obtain characteristic curves for blocking purposes of the most varied type because the setting means are provided with long rotational paths for being converted into axial setting movements.
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