Fluid Coupling, Glossary and Terms, Automotive, Motorcycle, Boat Dealers
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"Fluid Coupling"
Any device that transfers power through a fluid between its inputs and outputs. A fluid coupling basically consists of two fans in a sealed, oil-filled housing. The input fan churns the oil, and the churning oil in turn twirls the output fan. Such a coupling allows some speed difference between its input and output shafts.