Viscous coupling unit

An example of a viscous coupling unit opened up
The fluid inside the VC
Completely disassembled
The internal plates

A viscous coupling is a sealed mechanical device that transfers torque and rotation between two shafts by means of a viscous fluid. One use is in automobiles as a differential, especially in four-wheel drive vehicles. The device works automatically without computers or electronics to link the rear axle to the front so that when one set of wheels starts to slip, torque will be transferred to the other axle.

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