SIEMENS
FLENDER Standard Couplings
Torsionally Rigid All-Steel Couplings — ARPEX Series
General information
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Siemens MD 10.1 · 2015
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Overview
ARPEX couplings have proved themselves for over 30 years in
all areas of technology where reliable, maintenance-free torque
transmission is required. ARPEX couplings link machine shafts
and compensate for shaft misalignments, while generating only
low restorative forces. Thanks to the use of spring steel plates
and backlash-free screw connections, ARPEX couplings are tor-
sionally rigid and backlash-free. All ARPEX coupling compo-
nents are manufactured from high-quality steel. Robust, com-
pact construction guaranteeing a high level of operational
reliability and a long service life is therefore possible. High-pre-
cision production ensures that at speed in the assembled condi-
tion only low forces act on the machine parts connected to them.
ARPEX couplings can be used for both directions of rotation and
are thus also suitable for reverse operation.
ARPEX couplings are not subject to wear and, if correctly de-
signed, assembled and installed, can be expected to have an
unlimited service life. With most types the intermediate spacer
can be fitted radially without having to move the driving and
driven machines.
Thanks to a large number of standard components ARPEX cou-
plings can be combined to make many different types. In this
way, standard types can be used with many drives.
ARPEX couplings can withstand temperatures between
-40 °C and +280 °C in operation. On request, they can also be
specially equipped for use in other temperature ranges.
Coupling suitable for use in potentially explosive
atmospheres.
Complies with the current ATEX Directive for:
II 2G T2/T3/T4/T5/T6
-40 °C
≤
T
a
≤
+230 °C/+150 °C/+85 °C/+50 °C/+35 °C
II 2D T 120 °C -40 °C
≤
T
a
≤
+70 °C
I M2
To meet the high quality demands made of ARPEX couplings,
the development and manufacture of ARPEX couplings is inte-
grated into a certified quality management system in accor-
dance with the requirements of DIN EN ISO 9001.
Type approval for use of ARPEX couplings in shipbuilding has
been issued by the following classification societies: American
Bureau of Shipping (ABS), Det Norske Veritas (DNV), Ger-
manischer Lloyd (GL) and Lloyd's Register of Shipping. Product
certification to GOST-R for the Russian market has already been
obtained.
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Design
ARPEX couplings are manufactured completely from steel.
Torque is transmitted by means of torsionally rigid, flexible
plates. The plates are held together by a sleeve and ring to form
a compact plate pack. This ensures easy, operationally safe in-
stallation. Two plate packs fastened alternately to the flanges
permit compensation of shaft misalignments in an angular, radial
and axial direction. On coupling types with a single plate pack
only angular and axial misalignments are possible.
Materials
All coupling parts like hubs, spacers and flanges are manufac-
tured from high-grade steel; the plates are made from stainless,
hard-rolled CrNi spring steel. Bolts and nuts are of quality 10.9
or 10.
Application
ARPEX couplings are available as a catalog standard from
92 Nm to 1450000 Nm and are divided into various series. Be-
cause of this series diversity, ARPEX couplings meet most
torque and speed requirements as a universal coupling solution
in general mechanical engineering. The individual series and
their corresponding possible applications are described in full in
the following sections.
Plate pack
The flexible elements in an ARPEX coupling take the form of
plate packs. The individual, thin plates are held together by a
socket and ring to form a compact plate pack. The picture below
shows the structure of a ring plate pack.
Socket
Plate
G_MD10_EN_00140
Ring
© Siemens AG 2015