A fluid coupling or hydraulic coupling is a hydrodynamic device used to transmit rotating mechanical power. It has been used in automobile transmissions as an alternative to a mechanical clutch. It also has widespread application in marine and industrial machine drives, where variable speed operation and controlled start-up without shock loading o...
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http://en.wikipedia.org/wiki/Fluid_coupling
(from the article `automatic transmission`) ...of gears from low to high (ratios of the speeds of drive shaft and engine shaft) until the two shafts are directly connected through the oil in ...
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http://www.britannica.com/eb/a-z/f/40
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.
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http://www.caranddriver.com/reviews/glossary-of-terms-info
an apparatus in which a fluid, usually oil, transmits torque from one shaft to another, producing an equal torque in the other shaft. Also calledCf. hydraulic torque converter.
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https://www.infoplease.com/dictionary/fluid-coupling
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