Viscous coupling unit

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What Wikipedia says

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.

Excerpt from the Wikipedia article “Viscous coupling unit”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Ralf Pfeifer, CC BY-SA 4.0, via Wikimedia Commons.