special feature: drivetrain
SACHS Clutch Disc with
Torsional Damper
SACHS, a brand of ZF, demonstrates expertise in generating comprehensive solutions
with its integrated powertrain systems. ZF pursues a systems approach in developing and
manufacturing new products and technologies that represent real advances. ZF provides
overall solutions that meet the demands of overall systems.
Torsional dampers are individually tuned
because each engine/transmission
aggregate has its own characteristics.
The resulting superior spring
and damping characteristics
generate outstanding decoupling
qualities.
Peace and Quiet in the
Powertrain
Clutch discs are subject to
immense loads during
the vehicle’s life cycle,
and are complex
components
w ith compact
dimensions.
Besides
transmitting
torque, they
have additional
tasks such
as damping
torsional
vibrations,
ensuring good
operating
comfort, and
offering high
thermal resistance.
Clutch facings:
Long-lasting and
environmentally
friendly
By enabling carefully
calibrated sippage
in the launch phase,
the friction facings
and cashion springs
allow precision torque
calibration and are
therefore responsible for
the gentle clutch engagement
needed to start vehicles
smoothly.
Function: The
task
Ignition-induced irregularities in
rotational speed and rapid load alterations
generate vibrations in the powertrain,
which in turn cause disturbing noises in
the vehicle body and unpleasant rattling
in the transmission. Modern engines are
featuring smaller displacements and supercharging (down-sizing) in order to reduce
fuel consumption. These engines generate
high levels of torque at low rpm levels
(down-speeding) This constellation of
engine characteristics leads to an increase
in torsional vibrations. Yet drivers continue
to demand higher performance from their
damping systems.
Benefits: The technology
The torsional damper integrated in
the clutch disc is the main element for
adjusting torsional rotation properties
throughout the powertrain, from the
combustion engine to the wheels.
This effective vibrational damping system
consists of a friction unit and spring sets
for both driving and idling. Coil springs
positioned in windows allow a limited
degree of rotation between the crankshaft
and the transmission input shaft.
| words in action
34
august 2014
Clutch facings are made of a
number of carefully matched materials:
glass or aramid fiber together with
copper brass wire, embedded in a mixture
of resin, rubber, and fillers. Especially when
launching under tough conditions, but
also under normal driving operations, the
facings subjected to high friction speeds,
strong clamp loads, and extremely high
temperatures.
During all these types of conditions,
drivers still expect full performance. Clutch
facings from ZF contain no lead and are
manufactured via environmentally friendly
processes and comply with EU vehicle
recycling regulations.