Konecranes Presents
the world's first hybrid reach stacker
"Konecranes is a pioneer and leader in
allow. Such examples may be fuel
stacker, the hydraulic pumps are elec-
lifting technology and service. Our
cells or an energy storage that can be
trically driven and electronically
new hybrid reach stacker is an exciting
recharged via a connection to the
controlled. Dedicated electric motors
step forward for our industry and
power grid," Mr. Nilsson continues.
drive the pumps that provide the
further proofs that Konecranes is
Electrification of the driveline
hydraulic energy for lifting and steer-
committed to offering its customers
In a conventional reach stacker, the
ing. The speed of these pumps can be
eco-efficient products and services,"
driveline is a diesel/mechanical
controlled independently of diesel
says Lars Fredin, Vice-President and
system consisting of a diesel engine,
engine speed. More importantly, the
Head of Business Unit Lift Trucks,
torque converter and transmission.
return flow from the hydraulic cylin-
Konecranes.
The diesel engine produces the
ders is not converted into heat, but fed
Significantly reduced diesel fuel
energy for propulsion. The flow of
backwards through the pumps which
consumption
energy is mechanical and a quite
now act as hydraulic motors, thus
The new Konecranes hybrid reach
complex mechanical gearbox is
regenerating electrical energy.
stacker will offer customers substan-
required. The energy generated by
Electrical energy storage
tial cost and environmental benefits.
braking is converted into heat that is
A traditional reach stacker has
Estimated fuel consumption at normal
dissipated to the ambient and wasted.
conventional batteries for starting the
handling of fully loaded containers will
In the new Konecranes hybrid reach
engine and powering the electrical
be at least 30% lower than for equiva-
stacker, the driveline is a serial config-
systems including lights.
lent diesel powered reach stackers.
ured diesel/electric system consisting
The new Konecranes hybrid reach
This is achieved by electrifying all
of a diesel engine, an electrical gener-
stacker has a super capacitor system
flows of energy across the driveline,
ator and an electrical traction motor.
for energy storage that is connected to
the hydraulic lifting system and the
The diesel engine runs at constant
the truck's electrics. This system
energy storage system.
RPM for optimum fuel efficiency and
stores electrical energy that has been
"Propulsion and lifting are powered by
powers the generator. Propulsion is
recovered for later re-use, and boosts
dedicated electric motors that all can
provided by an electric motor that is an
the diesel powered electrical genera-
operate in regenerative modes. The
integral part of the drive axle. This
tor at times of peak power demand.
energy generated from braking and
motor also generates electrical energy
load lowering is recovered and stored
when braking, minimizing the need for
for later re-use. This results in a
mechanical braking and saving
substantial reduction in diesel fuel
energy.
consumption and environmental
Electrification of the hydraulic lift-
impact. Meanwhile, productivity is
ing system
increased in terms of quicker
In a conventional reach stacker, the
response and higher acceleration,"
diesel engine mechanically drives vari-
says Anders Nilsson, Technical
able displacement piston pumps that
Director, Konecranes Lift Trucks.
provide the hydraulic energy for lifting
"Potentially, the diesel engine of the
and steering. The energy that is
hybrid reach stacker could be
generated in lowering is dissipated to
replaced by another source of electri-
the ambient and wasted.
cal energy, as technology and price
In the new Konecranes hybrid reach
18
Issue 70 September 2013 2013 70

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