AGRITECHNICA FLUID POWER
November 10-16, 2019
Bucher Hydraulics
Hall 17, Stand E17
iVTInternational.com September 2019
BUCHER
95
A NEWLY DESIGNED SYSTEM PUTS AN END TO THE USUAL DISADVANTAGES
ASSOCIATED WITH HYDRAULIC PUMPS
The electrification of construction machinery
opens up completely new possibilities that –
because of their operating principle – today’s hydraulic
systems simply cannot offer. A case in point is a mix of
different hydraulic drive concepts that can be applied
in a flexible combination to meet the requirements of
the application and the project budget. In order to
reach these new opportunities, the most powerful
actuators can be equipped with the new AX pump
technology from Bucher Hydraulics while, for
drives with lower outputs and shorter ‘on’ times,
conventional load-sensing valve technology may be
more cost-effective. But even with these drives, there
is plenty of potential for efficiency improvements.
Compare and contrast
Conventional hydraulic pumps have a high power
loss and a correspondingly low efficiency. This was the
starting point for Bucher Hydraulics’ development of a
new type of pump that systematically eliminates friction
losses. It is available with displacements from 18 to
76cm³/rev, and units with up to 122cm³/rev will be
ABOVE: The AX can handle
pressures up to 450 bar
BELOW: Power losses are only
1.6kW with the AX
available in future. The pump is suitable for continuous
pressures up to 450 bar, the usual maximum pressure
for construction machines.
Featuring high efficiencies over a wide operating
range, it is the ideal partner for efficient electric
drives. To appreciate its potential, consider the
following comparison. While a conventional pump
may exhibit a power loss of 5.2 kW, it is only 1.6 kW
with the new Bucher Hydraulics AX pump. This
saves a lot of kilowatt hours, a fact that is
particularly noticeable with battery operation. The
battery can either be made smaller and cheaper, or its
running time can be extended, as modeling calculations
and initial experience have shown. The extremely low
friction not only reduces the power loss, it also decreases
wear to almost zero. This makes it possible to achieve a
long and reliable service life.
The new AX pump also solves the well-known
problem of many electrification projects, namely the
high noise level of the hydraulic components. End users
expect electrical machines to have a low noise level that
today’s axial piston pumps simply cannot meet. In
contrast, the AX pump eliminates the causes of noise
emission. Even at high power levels, it operates at a
comfortably low noise level that is comparable with
that of electrical machines.
Good illustrations
A typical lifting/lowering function for construction
machines gives a good illustration of the energy-saving
potential of the AX pump when compared with a
valve-controlled system and with an electro-hydraulic
linear drive using a conventional pump. The power
loss from the high-efficiency AX pump can be as
much as 50% less. This also reduces the CO2 emissions.
The new operating principle also removes the minimum
speed limit that would otherwise have to be observed.
This makes it possible to achieve precise cylinder
movements without any additional measures. This
considerably simplifies and extends the application
scope for variable-speed pumps. The AX pump
from Bucher Hydraulics therefore meets all the
requirements for battery-electric drives for mobile
construction machines. iVT
By Dierk Peitsmeyer, product portfolio manager,
Bucher Hydraulics
Pump efficiencies
FREE READER INQUIRY SERVICE
To learn more about this advertiser, visit
www.magupdate.co.uk/pivt
/iVTInternational.com
/pivt
