Liebherr Downloads - Manual (Page 6)

6
Liebherr actuator for tilting technology
Know-how from the aviation industry: electro-
hydraulic actuator from Liebherr for the Airbus A380
Yaw dampers prolong the service life of bogies
and reduce considerably maintenance costs
Electrohydraulic Actuators (EHA)
an Intelligent Solution for Rail Transport
Electrohydraulic actuators work as
compact, high-performance “power
houses” in rail vehicles and are pro-
duced by Liebherr to meet specific
customer requirements in a wide range
of applications.
These applications include active
lateral suspension and active lateral
centering systems, car positioning sys-
tems, active radial control, active wheel-
set control and tilt technology. Among
other attributes, EHA make a valuable
contribution to reducing the burden on
the environment and preventing wear
while increasing performance.
At train speeds of up to 350 km/h
EHA have to move heavy loads of sev-
eral tons into the position specified by
intelligent control units, or counteract
vibrations occurring on the vehicle.
They not only make faster train speeds
possible but also increase passenger
comfort.
A further key advantage of electro-
hydraulic actuators is that they reduce
car and infrastructure wear enormous-
ly. Initially rather high investment costs
are recouped very quickly through
lower maintenance expenses, reduced
total energy costs and higher carrying
capacity compared with conventional
hydraulic systems.
EHA are self-contained hydraulic
systems. Liebherr performs their as-
sembly, filling and final testing under
extremely clean conditions and thus
ensures they will achieve many years
of service in the tough environment of
rail transport. The car manufacturer fits
the Liebherr EHA to the vehicle and in-
stalls the cable connection for the en-
ergy supply and control systems. The
time-consuming installation work re-
quired on conventional hydraulic sys-
tems to route the lines and fill and vent
the circuit is thus eliminated. This also
removes the risk of contaminating the
hydraulic fluid through incorrect instal-
lation work and, as a result, damaging
the actuator. The system could almost
be described as having ‘plug and play’
functionality.
Electrohydraulic actuators from
Liebherr are fundamentally mainte-
nance-free. If a fault should occur,
however, the entire unit can be quickly
replaced without any hydraulic exper-
tise, thus avoiding prolonged vehicle
downtime.
A controller developed by Liebherr
regulates these innovative systems. Ac-
cording to requirements, the software
can be programmed up to safety level
Sil2 in accordance with EN 50128.
Active lateral suspension is the future, not only on Swedish trains
Railjet Siemens RH 1116