Fluid coupling
Device used to transmit rotating mechanical power / From Wikipedia, the free encyclopedia
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This article is about hydrodynamic fluid couplings. For hydroviscous fluid couplings, see Viscous coupling unit.
A fluid coupling or hydraulic coupling is a hydrodynamic or 'hydrokinetic' device used to transmit rotating mechanical power.[1] 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 of the power transmission system is essential.
Hydrokinetic drives, such as this, should be distinguished from hydrostatic drives, such as hydraulic pump and motor combinations.