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dual mass flywheel
A Dual mass flywheel or DMF is a rotating mechanical device that is used to provide continuous energy (rotational energy) in systems where the energy source is not continuous, the same way as a conventional flywheel acts, but damping any violent variation of torque or revolutions that could cause an unwanted vibration. The vibration reduction is achieved by accumulating stored energy in the two flywheel half masses over a period of time but damped by a series of strong springs, doing that at a rate that is compatible with the energy source, and then releasing that energy at a much higher rate over a relatively short time. The compact dual-mass flywheel also includes the whole clutch, (with the pressure plate and the friction disc).〔(Luk DMF's )〕
== History ==
''The Dual Mass Flywheels'' were developed to address the escalation of torque and power, especially at low revs. The growing concern for the environment and the adoption of more stringent regulations have marked the development of new engines, more efficient, lowering the cylinder number even to 3 or 2 cylinders-, and allowing to deliver more torque and power at low revolutions. The counterpart has been an increase in the level of vibration that traditional clutch discs are unable to absorb. This is where the ''Dual Mass Flywheels'' play a key role, making these mechanical developments more viable .〔(LUK Symposia )〕
The absorption capacity of the vibration depends on the moving parts of the DMF, obviously, they are subject to a certain wear. So when replacing the clutch -for a vehicle over 100,000 miles-, it is highly recommended that a competent workshop replace the dual mass flywheel when replacing the clutch. Otherwise, both the new clutch and the gearbox or crankshaft may suffer in excess.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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