Turbo Retarder Clutch

Handling heavy transporters made easy:
The Turbo Retarder Clutch VIAB

Powerful start-up and safe braking - with no wear and for loads up to 250 tons. With the Turbo Retarder Clutch (from the German: Wear-free Integrated Starting and Braking system), two elements that appear to be mutually exclusive work together: The advantages of hydrodynamics when starting and braking with the high efficiencies of a mechanical driveline while driving.

Stress and tension behind the wheel? Not anymore. VIAB scores high when it comes to sensitive start-up and braking behaviour, as well as driving comfort. Just put your foot on the metal. As usual, simply pull the lever and the retarder decelerates safety and without wear. As many times as you like. Forget about overheating problems and all the other disadvantages of traditional torque converter solutions.

Experience it for yourself: The Turbo Retarder Clutch VIAB is a standard feature in the Mercedes Benz Actros SLT.

Powerful start-up and safe braking - with no wear and for loads up to 250 tons.

Start-up System



The Turbo Retarder Clutch VIAB is a completely new start-up and braking system with a fill-regulated, hydrodynamic fluid coupling as the main component. It unites the hydrodynamic start-up and hydrodynamic braking functions into one system.

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The benefits to you

  • High comfort through sensitive hydrodynamic start-up and shifting
  • High availability thanks to a wear-free start-up without friction coupling
  • Integrated high performance primary retarder
  • Maximum start-up tractive power at low speeds
  • Full conversion of engine torque up to traction limit
  • Overload-resistant with high thermal stability
  • Lower fuel consumption in comparison to conventional converter solutions
  • New efficient automatic transmission concept: combination of turbo coupling and automated manual transmission

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Principle of operation

Principle of operation diagram

Turbokupplung Funktionsschema

ÜK Converter lockup clutch
D Torsional vibration damper
TK Fluid coupling
P Impeller
T Turbine wheel
R Rotor
S Stator
F Free wheel coupling
TB Turbine brakes

Upon start-up, the motor transfers power via the hydrodynamic circuit, as well as the downstream free wheel, to the transmission input shaft. Parallel to the circuit, a conventional friction coupling is arranged as a converter coupling.

When braking, the turbine brake arrests the turbine wheel. The system turns into a high performing retarder.

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Turbo Retarder Clutch VIAB       - Trucks     

Voith Turbo GmbH & Co. KG
Alexanderstraße 2
89522 Heidenheim, Germany      

Mr Martin Becke
Tel. +49 7321 37-4426
Fax +49 7321 37-134426

Turbo couplings - industrial applications   

Voith Turbo GmbH & Co.        Start-up Components (ait) Voithstraße 1                          74564 Crailsheim, Germany

Tel. +49 7951 32-409
Fax +49 7951 32-480

Voith at the IAA 2014

Experience Voith at the IAA 2014 in Hannover from 25.09 - 02.10.
We look forward to welcoming you at our booth A14 in hall 17.
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Turbo Retarder Clutch VIAB

Turbo Retarder Clutch VIAB

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