The viscous-coupling test stand is the result of many years of research dealing with the system of Visco-transmission. It is a "Spin-off" of a master thesis from the University of Applied Sciences Technikum Wien.


The unusual vertical build of the test stand results from the basic idea that was central when it came to its construction:
• In order to closely investigate the problem of "oilsucking",
realistic test runs of the viscous-coupling in gear oil should be possible.

• Test runs concerning the service life, done for several hours at a
constant temperature level are only possible in a cooling medium (e.g. gear oil).


Rebuilding always happens according to the manufacturer’s instructions, which allow for a tolerance band of ±10% regarding the characteristic curve. Deviating from its original state, a special valve is additionally screwed into the case cover in order to solve the problem of oilsucking:


Main Components

An overview of the mechanical construction:

• An asynchronous motor fed by a frequency converter drives a planetary gear

• The hub of the viscous-coupling is powered by a drive shaft

• The analysis is done by a highly sensitive load cell following the principle of measuring the reactive torque.

Recorded figures

• Case temperature of the viscous-coupling

• Transmitted torque

• Measurement of the inner pressure (currently planned)
Thanks to the vertical build of the test stand, it is also possible to conduct realistic test runs of the viscous-coupling in gear oil.

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