Importance

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Abstract

Fluid friction clutches tend to operate discontinuously when the performance requirement is low and therefore the filling ratio in the working chamber is also low. This so-called 'surging' is to be avoided. According to the invention, a forced guiding is provided for the clutch fluid from a front part of the working chamber into the rear part of the working chamber, and only then is the return flow provided to the storage chamber which is achieved by a sealing-off of the working chamber into these two areas by means of the clutch disk and by means of the arrangement of a fluid deflector with damming bodies at a part of the circumference. The resulting forced distribution of clutch fluid on both sides of the clutch disk permits a smooth operation of the clutch and, when pumping elements are arranged, also a reduction of the hysteresis. Fluid friction clutches of this type are particularly suitable for fan drives for cooling devices of motor vehicles.

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First Claim