When the clutch is disengaged, a fan speed of approx. 100 RPM results. This so-called drag speed is caused through the bearing friction.
When additional cooling is required, the electromagnet is activated. The fan now runs synchronous to the input speed, with no loss of speed. The signal for the electromagnet either comes directly from a temperature sensor in the cooling circuit or via the engine-control system. The result is demand-meeting fan engagement.
A mechanical interface, as an example, is the front of the engine. In this section, the clutch also contains the assembly plate as well as the pulley. Further possible interfaces, depending on application, can be the water pump or the crankshaft. When the fan is positioned offset of the engine, the pulley forms the mechanical interface.
This particular clutch is used in regions where it is continuously cold and active fan cooling is normally not required. Of course, the clutch provides additional safety, so that the maximum cooling capacity can be called off under high loads. Another application area of the 1-speed fan clutch is for emergency power generators. When starting a generator unit, the fan capacity can be reduced to "zero" through the disengaged clutch, until the gen set reaches its operating temperature. The gen set power output increases upon fan activation.
Specifications and technical data
|Transferable torque:||Up to 500 Nm|
|Diameters of driven fans:||Up to approx. 1,500 mm|
|Supply voltage:||12 or 24 V|
Further engine-cooling system products
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