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Highly flexible couplings – Technical information


A driveline will normally consist of:

  • a driving machine (prime mover)
  • coupling elements (couplings, gears etc.)
  • a driven machine (power consumer)

The individual components of a driveline are made of elastic materials (e.g. steel) and have a mass. Accordingly they represent a system susceptible to torsional vibration. If this system is incited, it will start vibrating with a determined frequency: its natural frequency and amplitude.

If a damping is introduced, the vibration amplitude will assume a finite value. A reciprocating diesel engine does not convey its capacity evenly over one rotation of the crankshaft. Nonetheless, a diesel engine strains the driveline considerably, especially since the new injection technologies have been introduced and there is the trend towards ever lighter inertia weights.

A useful operational strength and unit lifetime is often achieved only after a highly flexible coupling has been installed in the driveline.

Customer benefits of the highly flexible coupling

Customer benefit by using a Voith highly flexible coupling in the driveline:

  • increased availability of all components in the driveline
    due to damping of torsional vibrations and load peaks in the driveline
  • decreased life cycle costs
    due to increases lifetime of all driveline components
  • increased comfort
    due to less vibration and noise

Dimensioning of highly flexible couplings

Dimensioning a highly flexible coupling is an iterative process due to the complexity of the material stressing: