User Guide
dampers, is moved to a lower resonance speed range.
This ensures excellent damping of engine vibration even
at idle speeds.
The functioning principle of a DMF is simple, yet ecient.
Owing to the additional mass on the transmission input
sha, the vibration torque range, which is normally
between 1,200 rpm and 2,400 rpm with original torsion
. Function
2 Dual mass flywheel – DMF
Working principle with a dual mass flywheelWorking principle of a conventional flywheel
Transfer of torsional vibration
1 Engine
2 Clutch
3 Transmission
4 Torsion damper
5 Primary mass
6 Secondary mass
7 Flywheel
1 3
Engine
Transmission
Engine
Transmission
1/min 1/min
With a dual mass flywheel: in contrast, the spring/
damper system of the DMF lters out torsional vibration
caused by the engine. This prevents gearbox components
knocking against each other – rattling does not occur
and the driver’s demands for higher comfort are fully
met.
With a conventional flywheel: in the design that was
previously common, with a conventional flywheel and
torsion-damped clutch disc, the torsional vibrations in
the idling range are transferred practically unltered to
the gearbox and cause the gear teeth edges to knock
together (gearbox rattle).
7 2 3 1 5 4 6 2