fluid-drive

fluid drive

noun Automotive.
a power coupling for permitting a smooth start in any gear, consisting of two vaned rotors in a sealed casing filled with oil, such that one rotor, driven by the engine, moves the oil to drive the other rotor, which in turn drives the transmission.

Origin:
1940–45

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World English Dictionary
fluid drive
 
n
fluid coupling, fluid clutch, Also called: fluid flywheel a type of coupling for transmitting power from the engine of a motor vehicle to the transmission, using a torque converter

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