Components of fluid coupling

A fluid coupling consists of three components, plus the hydraulic fluid:
The housing, also known as the shell(which must have an oil tight seal around the drive shafts), contains the fluid and turbines.
Two turbines (fan like components):
One connected to the input shaft; known as the pump or impellor, primary wheel input turbine
The other connected to the output shaft, known as the turbine, output turbine, secondary wheel or runner
The driving turbine, known as the ‘pump’, (or driving torus) is rotated by the prime mover, which is typically an electric motor or internal combustion engine. The impellor’s motion imparts both outwards linear and rotational motion to the fluid.