torque converter

noun Machinery.
a fluid coupling in which three or more rotors are used, one of which can be checked so that output torque is augmented and output speed diminished.

Origin:
1925–30

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World English Dictionary
torque converter
 
n
Also called: hydraulic coupling a hydraulic device for the smooth transmission of power in which an engine-driven impeller transmits its momentum to a fluid held in a sealed container, which in turn drives a rotor

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Example sentences
The sole transmission is a six-speed automatic with a new torque converter, up
  from the current five-speed.
Typically, transmissions with electronic transmission control, have more than
  one set of torque converter lockup preconditions.
Change all fluids such as engine, transmission, torque converter transfer case
  and other differentials.
For automatic transmissions, the input and output speed of the torque converter
  turbine can be used to infer crankshaft torque.
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