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Dual Mass FlywheelCalming the drive train
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The LuK Dual Mass Flywheel (DMF) has
been used by car manufacturers as
original equipment for decades.
Why? Because excellent noise and
vibration damping is extremely im-
portant in order to satisfy the
increasing demands for driving
comfort. A clutch system therefore
must not only ensure safe coupling and
decoupling of engine and transmission,
but also absorb vibrations to prevent
gearbox rattle and body boom.
Less vibration in the drive train more
momentum in your business
The DMF provides technical benefits
manufacturers cannot ignore! As a sup-
plementary part of the clutch, the DMF
is positioned between the engine and
the transmission to neutralize vibration
and relieve the strain on the crankshaft.
Thus the DMF meets the ever greater
demands for smooth running, driving
comfort and fuel efficiency.
Torsional vibration withconventional flywheel
Torsional vibration with DMF
The DMF, like the clutch itself, is subject
to normal wear and tear. It is therefore
important to test and replace the DMF,
if necessary.
In summary:
fulfills the increased demand for
driving comfort
reduces noise and fuel consumption
must also be checked during a clutch
repair and replaced if necessary
cannot be retrofitted
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ORIGINALEQUIPMENT
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2000 2002 2004 2006 2008 20100
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20
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60
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The number of new vehicles fitted with a LuK
Dual Mass Flywheel continues to increase.
millionpassengercars
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... with a thriving future!
Today, every second passenger car or light commercial
vehicle
which rolls off the assembly line is equipped with a DMF and
that share is still increasing! The trend towards more
engine
torque and more gear speeds ensures excellent prospects
for the DMF. Because the DMF offers just what the market
needs: more driving comfort and less fuel consumption. And
due to the increasing market share in the OE sector, the
DMFs
business potential in the aftermarket is also growing.
In short:
a success story for more than 20 years
expanding market share in original equipment
(every second car in Europe)
A success story
Since its launch in 1984, the LuK Dual Mass Flywheel (DMF)
has been fitted as original equipment in more and more car
models. And that for a very good reason where a conven-
tional single-mass clutch and rigid flywheel reach their
limits,
the DMF, with its decoupled dual masses and a torsion angle
of up to 180, can absorb much more oscillating energy.
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The characteristics of each DMF areprecisely designed for its
correspondingapplication. Springs, dampers andmasses must be
perfectly harmonisedwith the vehicles drive train components.
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The following vehicle manufacturers trust
in superior original equipment quality made
by LuK:
Audi, Bertone, BMW, Chevrolet, Citron, Fiat, Ford,
Honda, Hyundai, Jaguar, Jeep, Kia, Lancia, Land
Rover/Range Rover, LDV, Mazda, Mercedes-
Benz, MG, Mini, Mitsubishi, Nissan, Opel,
Peugeot, Porsche, Puch, Renault, Rover,
Saab, Seat, Ssangyong, Suzuki, Toyota,
Vauxhall, Volkswagen, Volvo.
The DMF is on the way to becoming
an OE standard in passenger cars and
light commercial vehicles with almost
every leading vehicle manufacturer. The
list of makes and models ranges from A as
in Audi to V as in Volvo and speaks for itself.
OE quality in its full variety
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In order for you, the independent workshop, to benefit most
from the DMF, LuK strives to make its handling as easy as
possible. The following useful advice helps you to detect
wear and tear and damage patterns on a DMF.
Friction surface A:
Scoring marks on the friction surface are
caused by the rivets of a worn out clutch.
Torque can no longer be transferred and
the friction surface is subjected to
continued wear.
Friction surface B:
Cracks in the friction surface occur as a
result of thermal overload, caused e.g. by
a worn out clutch disk. The DMFs oper-
ational reliability is no longer maintained.
Plain bearing:
Radial bearing clearance of up to 0.17mm
is within the limits of normal wear and tear.
Caution: If clearance exceeds 0.17mm, in-
creased tilting movement of the secondary
flywheel occurs.
Identify , verify , act!
The basic rule is: A DMF cannot be repaired, it must be
replaced. Whether or not a DMF requires replacement can
be determined by the following symptoms:
DMF outer edges :
Blue/purple discolouration at the outer edges,
on the connecting bars where the DMF is
bolted to the crankshaft, on the back side
as well as other visible damage indicates
that very high thermal loads were applied.
Starter ring gear:
A heavily worn starter ring gear is caused
by a defective starter, this can be accompa-
nied by noise emission at engine start-up.
Sensor ring:
Bent sensor ring teeth indicate mechanical
damage and are detrimental to the smooth
running of the engine.
Grease egress:
Little grease egress is no reason for concern.
If however more than 20g have leaked, the
amount of grease left in the housing is no
longer sufficient to ensure effective lubri-
cation of the DMF components.
Europe relies on the DMF. Be ready!
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A smooth ride in more than 45 millioncars in EuropeThe Dual Mass
Flywheel for efficient vibration damping.
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For further information please contact:
Phone: +49 (0) 18 01 - 753-333
Fax: +49 (0) 61 03 - 753-297
E-Mail: [email protected]
Internet: www.LuK-AS.com
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