How To Check Your DMF Dual Mass Flywheel The Correct Way

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A dual-mass flywheel (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. A compact dual-mass flywheel often includes the whole clutch, including the pressure plate and the friction disc

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 more efficient new engines, lowering the cylinder number to 3 or even 2 cylinders, and allowing the delivery of more torque and power at low revolutions. The counterpart has been an increase in the level of vibration which traditional clutch discs are unable to absorb. This is where the dual-mass flywheels play a key role, making these mechanical developments more viable.[2]

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 two key wear characteristics are freeplay and sideplay (rock). These should be measured to determine whether the flywheel is serviceable. The wear limit specifications can be found in vehicle or flywheel manufacturer's published documentation. Other failure modes are severely grooved/damaged clutch mating surface, grease loss, and cracking
Individual bent spring
The simplest form of the bent spring is the standard single spring.

One-phase bent springs in parallel
The standard springs are called parallel springs of one phase. These consist of an outer and an inner spring of almost equal lengths and connected in parallel. The individual characteristic curves of the two springs are added to form the characteristic curve of the spring pair.

Two-phase bent springs in parallel
In the case of two-stage spring there are two curved parallel springs, one inside the other, but the internal spring is shorter so that it acts later. The characteristic curve of the outer spring is adapted to increase when the engine is started. The softer outer spring only acts to increase the problematic resonance frequency range. When the torque increases, reaching the maximum value, the internal spring also acts. In this second phase, the inner and outer springs work together. The collaboration of both springs thus ensures good acoustic isolation at all engine speeds.

Three-phase bent spring
This curved spring consists of an outer and two inner springs with different elastic characteristics connected in series. This category of bent spring uses the two concepts together: parallel and series connection in order to ensure optimal torsional compensation for each value of torque

Disclaimer:
Due to factors beyond the control of Bodgit And Leggit Garage, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. Bodgit And Leggit Garage assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. Bodgit And Leggit Garage recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of Bodgit And Leggit Garage, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained

#dmf #secret #correctway

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