Liebherr Downloads - Manual (Page 10)

10
Electro-Hydraulic Actuators −
an Intelligent Solution for Rail Transport
Electro-hydraulic actuators (EHA) work
as compact, high-performance “power
houses” in rail vehicles, and are pro-
duced by Liebherr to meet specific cus-
tomer requirements in a wide range of
applications.
These applications include active lateral
suspension and active lateral centering
systems, car positioning systems, ac-
tive radial control, active wheelset control
and tilt technology. Among other attrib-
utes, EHA make a valuable contribution
to reducing the burden on the environ-
ment and preventing wear while increas-
ing performance.
At train speeds of up to 350 km/h EHA
have to move heavy loads of several 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 EHA is that
they reduce car and infrastructure wear
enormously. Initially rather high invest-
ment costs are recouped very quickly
through lower maintenance expenses,
reduced total energy costs and higher
carrying capacity compared with con-
ventional hydraulic systems. EHA are
self-contained hydraulic systems.
Liebherr performs their assembly, fill-
ing 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 installs the cable con-
nection for the energy supply and con-
trol systems. The time-consuming in-
stallation work required on conventional
hydraulic systems to route the lines, fill
and vent the circuit is thus eliminated.
This also removes the risk of contaminat-
ing the hydraulic fluid through incorrect
installation work and, as a result, dam-
aging the actuator. The system could
almost be described as having ‘plug and
play’ functionality.
EHA from Liebherr are fundamental-
ly maintenance-free. If, nevertheless, a
fault should occur, the entire unit can be
quickly replaced without any hydraulic
expertise, thus avoiding prolonged vehi-
cle downtime.
The innovative EHA systems are regulat-
ed by a controller which communicates
with the vehicle control unit via CAN bus.
This controller was also developed by
Liebherr.
Liebherr’s EHA can be adapted for all
customer requirements and ensure fast,
comfortable, and above all safe arrivals
at the destinations.
Above: Active yaw
damper system
Below: Actuator for
tilting technology
Twindexx Express
© Bombardier Transportation
Transportation Systems