Browse By Letter

Search engineering dictionary:


Fluid Drive Couplings

A fluid drive coupling is a special type of coupling commonly found in power transmission systems to transfer torque from one component to another. Rather than a mechanical coupling that connect two shafts, a pair of rotating blade rows is used. The rotating blade set on one shaft acts as a pump and turns the fluid. The rotating fluid then turns the turbine - the rotating blade row attached to the second shaft, thereby transmitting the torque by means of the fluid. Due to friction losses in the blades, a fluid coupling is not 100% efficient.