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Viscous coupling unit

 
Viscous Coupling Unit

 
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Viscous coupling unit
 
 
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A viscous coupling is made up of alternating circular plates.






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Viscu
Vcoil
Vc1a
Vc2
A viscous coupling is made up of alternating circular plates. The plates have tabs or perforations in them. The plates are mounted in a sealed drum, and are located very close to each other. The drum is filled with silicone
Silicone

Silicones are largely inert, man-made compounds with a wide variety of forms and uses. Typically heat-resistant, nonstick, and rubberlike, they are commonly used in cookware, medicine, sealants, adhesives, lubricants, and insulation....
, or some dilatant fluid
Power-law fluid

A Power-law fluid is a type of generalized Newtonian fluid for which the shear stress, τ, is given bywhere:*K is the flow consistency index ,...
. When the two sets of plates are rotating in unison, the fluid stays cool and remains in a liquid state. When the plates start rotating at two different speeds, the shear effect of the tabs or perforations on the fluid will cause it to heat up and solidify (Silicone when heated will turn into a near solid; the viscosity
Viscosity

Viscosity is a measure of the Drag of a fluid which is being deformed by either shear stress or extensional stress. In everyday terms , viscosity is "thickness"....
 of dilatant fluids rapidly increases with shear). The fluid in this state will essentially glue the plates together and transmit power from one set of plates to the other. The size of the tabs or perforations on the plates, along with the number of plates and fluid used will determine the strength and onset of when this mechanical transfer will happen.

Viscous couplings are used as the center differential in some 4WD/AWD vehicles, and also as a limited slip differential
Limited slip differential

A limited slip differential is a modified or derived type of differential gear arrangement that allows for some difference in rotational velocity of the output shafts, but does not allow the difference in speed to increase beyond a preset amount....
 (LSD) in rear axles.

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