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WordNet
torque converter

n. converter for transmitting and amplifying torque (especially by hydraulic means)

Wikipedia
Torque converter

In modern usage, a torque converter is generally a type of fluid coupling that is used to transfer rotating power from a prime mover, such as an internal combustion engine or electric motor, to a rotating driven load. The torque converter normally takes the place of a mechanical clutch in a vehicle with an automatic transmission, allowing the load to be separated from the power source. It is usually located between the engine's flexplate and the transmission.

The key characteristic of a torque converter is its ability to multiply torque when there is a substantial difference between input and output rotational speed, thus providing the equivalent of a reduction gear. Some of these devices are also equipped with a temporary locking mechanism which rigidly binds the engine to the transmission when their speeds are nearly equal, to avoid slippage and a resulting loss of efficiency.

Usage examples of "torque converter".

Because the tractors transmission was a torque converter, the thrumming engine note remained constant though the chink of the treads slowed.

Because the tractor's transmission was a torque converter, the thrumming engine note remained constant though the chink of the treads slowed.

The truck's torque converter built to a peevish whine as inertia fought the diesel's rattling surge.

The jeep's engine lugged for a moment before its torque converter caught up with the demand.

The jeeps engine lugged for a moment before its torque converter caught up with the demand.