A torque converter is a type of fluid coupling which transfers rotating power from a prime mover, like an internal combustion engine, to a rotating driven load.
source/image(PrtSc): Learn Engineering
Most of us enjoy the smooth and effortless feeling of driving in an automatic transmission car. The driving is effortless because you don’t need to worry about gear changing and you don’t have a clutch pedal to operate. Watch the video from Learn Engineering for more info:
In an automatic transmission car the work, of the clutch pedal, is automatically done by a hidden component, which is truly an engineering marvel, the torque converter. The torque converter can even multiply the torque. Let’s see how this purely mechanical device performs its tasks.
The main characteristic of a torque converter is its ability to multiply torque when the output rotational speed is so low that it allows the fluid coming off the curved vanes of the turbine to be deflected off the stator while it is locked against its one-way clutch, thus providing the equivalent of a reduction gear.