Dual-mass flywheel

Modern engines can be driven at extremely low speeds. The trend is towards increasingly higher engine torques. Furthermore, bodies are getting quieter and many components getting...

Function

Modern engines can be driven at extremely low speeds. The trend is towards increasingly higher engine torques. Furthermore, bodies are getting quieter and many components getting lighter and lighter in order to reduce weight and thus save fuel. Other measures designed to find the optimum technical solution are resulting in more sources of noise but less natural damping. The principle of the reciprocating piston engine is still with us. Its periodic combustion processes induce torsional vibration in the drive train, with the unpleasant consequences of rattling gearboxes and roaring bodies. The dual-mass flywheel (DMF) effectively isolates engine vibrations from the gearbox and the drive train, offsetting such disadvantages.

The dual-mass flywheel

The dual-mass flywheel is a flywheel complete with a torsional vibration damper. It prevents torsional vibration from the reciprocating piston engine being transmitted to the drive train. The DMF uses a spring damping system to decouple the primary flywheel mass on the engine side and the inbound secondary flywheel mass. The spring damping system absorbs virtually all of the torsional vibration and the resulting noises in the drive train. Vehicles with DMF benefit from increased noise and ride comfort. Furthermore, as the mass to be synchronised is less on vehicles with DMF, the gearbox can be shifted more easily and synchronisation wear is reduced.

Safety

The increasingly dense traffic on our roads requires maximum concentration on the part of drivers. For this reason, it is increasingly important to keep all sources of distraction at bay. The technology of the DMF makes relaxed, safe and smooth driving possible.

Depreciation

DMF technology is maintenance-free.

Avoid damage to the DMF

To avoid damage to the DMF, faulty clutches should be replaced as quickly as possible. When a clutch is repaired, the dual-mass flywheel should be checked with a special tool to ensure that it is in perfect working order and replaced if necessary. 

Malfunction

Every DMF is matched to the performance characteristic of the engine. Intervening in the engine electronics to increase performance will cause the DMF to malfunction or fail prematurely.

Environmental protection

Alongside high levels of ride and noise comfort, the DMF promotes driving in operating ranges in which consumption is optimised, thereby making a significant contribution to the reduction of CO2 emissions. Moreover, the operational smoothness required for economical engine concepts (three-cylinder engines, for example) can be achieved with the DMF.

  • Exploded view of dual-mass flywheel centrifugal pendulum
  • Dual-mass flywheel

Manufacturer

  • Logo HERTH+BUSS
  • Logo Schaeffler Automotive Aftermarket
  • SACHS Logo

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