Definitions for "Viscous Coupling"
A fluid coupling in which the input and output shafts mate with thin, alternately spaced discs in a cylindrical chamber filled with a viscous fluid that clings to the discs, thereby causing them to resist the speed differences between the two shafts. Viscous couplings are used to limit the speed differences between two inputs on a differential or between two axles on a vehicle.
Connection between two rotating components that employs the viscosity of fluid to transmit torque. Also, it applies to a torque-responsive 4WD drive unit that directs torque from the transmission to the wheels with most traction.
An arrangement of discs in a viscous fluid that allows two shafts to rotate at the same or only slightly different speeds. It can be incorporated in a differential to allow a slow, but not a high speed, differential action, ie. preventing wheel-spin without transmission wind-up. See [example
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