In addition to friction clutches, hydrokinetic clutches have been used in some vehicles, transmitting power due to the inertia of the liquid rotating between the blades of the two rotors: propelling and driven. The impeller is coupled to the crankshaft of the engine, and the driven rotor - with the gearbox input shaft.

Due to the lack of a rigid connection between the driving and driven side, the turbo coupling works with constant slip. The value of the moment transmitted by such a clutch depends on the intensity of the spinning of the liquid, therefore this moment is all the greater, the greater the speed difference between both sides of the clutch.