What is a Dual-Mass Flywheel?

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Dual-Mass Flywheel:

A dual-mass flywheel (DMF or DMFW) is a rotating machine that’s wont to provide continuous energy (rotational energy) in systems where the energy source isn’t continuous, the identical way as a traditional flywheel acts but damping any violent variation of torque or revolutions that might cause unwanted vibration.

The vibration reduction is achieved by accumulating stored energy within the two flywheels half masses over a while but damped by a series of strong springs, doing that at a rate that’s compatible with the energy source, so releasing that energy at a way higher rate over a comparatively short time. A compact dual-mass flywheel often includes the full clutch, including the pressure plate and also the friction disc.



Dual-mass flywheels were developed to handle the escalation of torque and power, especially at low revs. The growing concern for the environment and also the adoption of more stringent regulations have marked the event of more efficient new engines, lowering the cylinder number to three or maybe 2 cylinders, and allowing the delivery of more torque and power at low revolutions. The counterpart has been a rise within the level of vibration that traditional clutch discs are unable to soak up. This can be where the dual-mass flywheels play a key role, making these mechanical developments more viable.

The absorption capacity of the vibration depends on the moving parts of the DMF, these parts are subject to wear. Whenever the clutch is replaced, the DMF should be checked for wear. The 2 key wear characteristics are Free to play and side play (rock). These should be measured to see whether the flywheel is serviceable. The damage limit specifications may be found in the vehicle or flywheel manufacturer’s published documentation. Other failure modes are severely grooved/damaged clutch mating surfaces, grease loss, and cracking.

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