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Functionality of the Retarder

The rotor which is driven by the propshaft accelerates the oil, which is then decelerated in the stator. Due to the oil turbulences, the rotor and consequently the vehicle is slowed down. The braking heat arising thereby is dissipated via the vehicle’s cooling system.

To understand the functionality of the Voith Retarders, here you can view or download a 2D -Flash - animation.
 
Animation - Functionality of the Voith Retarder
 

Hydrodynamic principle


When the retarder is operated, liquid is pressed into the working chamber between rotor and stator.

The rotor must incorporate the liquid in its rotation and accelerate the same.

In this process the liquid is transferred to the outside diameter and passes over to the stator.

Inside the stator the liquid is turned aside and fed back again to the rotor at the inside diameter of the working chamber.

The energy required to accelerate the liquid is taken from the vehicle kinetic energy and has thus a retarding effect.

The developing hydrodynamic energy is converted into heat.
Animation - Hydrodynamic principle
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