|
Size
code |
Displacement
Vg (cc/rev) |
Operating
pressure P2 (bar) |
Maximum
speed (rpm) |
Minimum
speed (rpm) |
|
060 |
6.2 |
250 |
4000 |
400 |
|
080 |
8.3 |
250 |
4000 |
400 |
|
110 |
11.3 |
250 |
3600 |
400 |
|
140 |
14.5 |
250 |
3300 |
400 |
|
160 |
16.5 |
250 |
3000 |
400 |
|
190 |
19.6 |
250 |
3000 |
400 |
|
230 |
23.7 |
210 |
2800 |
400 |
Operating pressure
P2 - max. 20 sec loaded following 10 sec minimum unloaded. Minimum
speed is valid for CALMA pump series with optional Low speed
feature (Design code ”L”).
Low speed feature (Design code ”L”):
At 400 RPM and operating pressure 250 bar - max. 2,5 sec load
duration. Reduced operating pressure results in longer load duration
(>2,5 sec).
Min. viscosity range: min. 10 mm2 /s.
Haldex launches quietest
hydraulic pump for vehicles
The pump, designated
CALMA, features a newly engineered tooth geometry, innovative
true dual-flank gear engagement, reduced trapped oil volume and
advanced trapped oil management. The design reduces pressure pulsation
by 75%,
which is the key factor determining the pump's noise levels,
while also reducing energy consumption.
In the market
for electric and gas-powered vehicles, low noise is a key requirement,
while low-speed operation enables improved control and positioning
for various vehicle functions. Consequently, gear pumps that can operate
efficiently and quietly at low speeds are now among the most
important priorities for electric vehicle designers. The trend towards lower
noise standards, which has been further encouraged by legislation
in Europe and elsewhere, also applies to other markets including
truck, bus and off-highway, where CALMA is also expected to find
many applications.
Apart from its
low noise benefits, the CALMA pump offers important energy-saving
advantages. Considerable excess hydraulic flow is generated in
maneuvring the vehicle and this energy is normally dumped via
valves, creating waste heat and a premature drain on battery
power. CALMA's
adjustable and low-speed capability avoid unnecessary power drain
and further increase battery life.
Both static and
in-vehicle tests have demonstrated that CALMA series pumps offer
significantly lower noise operation when compared with other
external gear pumps. In many cases, they can also match or even
out-perform more expensive internal gear pumps on efficiency
and low-noise operation. CALMA is especially well suited to applications
on electric counterbalanced lift trucks and warehouse lift trucks.
Sound power testing
in comparison with other quiet gear pumps on these vehicles showed
CALMA provided significant
reductions in noise during the steer, tilt and lift functions
by 50% to 85%.
CALMA is also well suited to electric aerial work platforms and
other mobile equipment where low noise, low speed and high efficiency
are required.
Following an
exhaustive program of research and development in collaboration
with the University of Dresden, Haldex Hydraulics has introduced
a range of CALMA pumps in displacements from 6.2 cc to 23.7 cc.
The company is a specialist in hydraulic gear product technology
and established itself as a leader in low-noise gear products
a decade ago when it introduced the first WQ series (quiet) gear
pump product line. This introduced the concept of true dual flank
engagement of the gear teeth (as opposed to “almost dual
flank engagement”), which is unique to Haldex and which
reduces the amplitude of the pressure pulsations introduced into
the hydraulic system.
Like other products
in the Haldex range, the new CALMA pump is designed to be used
as a single unit or as an element within multiple hydraulic assemblies.
The modular
philosophy common to the Haldex range means that standard housings
can easily be varied to incorporate different functions and different
internal connections. The modular approach also helps to ensure the
very exacting production standards required to deliver market-leading
technologies cost-efficiently.
|
