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Video Thermodynamics 1
Video Thermodynamics 2
Video Thermodynamics 3
Video Thermodynamics 4
Video Thermodynamics 5
Video Thermodynamics 6

Video Cooling

Video Add. Information
Video Summary
Video Maintenance
Video Repair
Video How to get engine warm?
Video Air Cooling
Video Air-stream Cooling
Video Air/Liquid Cooling
Video Blower Cooling
Video Axial Blower 1
Video Axial Blower 2
Video Radial Blower
Video Liquid Cooling
Video Cooling Module
Video Radiator
Video Closed Cooling S.
Video Coolant Pump 1
Video Coolant Pump 2
Video Coolant Pump 3
Video Coolant
Video Antifreeze
Video Frost Plug
Video Electr./Hydr. Fan
Video Vacuum Filling
Video Hydrostatic Blower
Video Belt Drive
Video V-belt Drive
Video Fuel Vaporization
Video Thermostat
Video Electronic Cooling 1
Video Electronic Cooling 2
Video Thermosiphon Cooling
Video Visc. Cooling Fan 1
Video Visc. Cooling Fan 2
Video Oil Cooling
Video Heat Exchanger
Video Charge Ait Cooler 1
Video Charge Ait Cooler 2
Video Fuel Cooling

          A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Visco-static Cooling Fan


In the straight mounted engine - and that's the only one we're talking about here - the cooling fan previously was simply mechanically connected to the crankshaft. However, just then, at high speeds, when the the fan demands a lot from the engine, it is used least, because enough air is blown through the radiator anyway. In contrast, particularly as far as trucks are concerned, when travelling slowly, where their cooling needs are high, the performance of the cooling fan is particularly weak. This problem is very elegantly solved, even without electrics, by the visco-static cooling fan.


One makes good use of the characteristics of the fan, because it is installed directly behind the radiator, in the airstream. Thus, not only can the fan draw the air through the radiator, in addition, it can also check whether it's necessary to also run or not. In it's center, it consists of ribbed aluminium to achieve the largest possible surface area, this then warms up more when the radiator temperature is too high. The broad, bi-metal spring in the center of figure 2 regulates the visco-static liquid, which, similar to the visco-static clutch, connects the fanwheel with the crankshaft. The more the temperature rises, the higher the torque transfer is. 12/10               Top of page               Index
2001-2015 Copyright programs, texts, animations, pictures: H. Huppertz - E-Mail
Translator: Don Leslie - Email:

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