SIEMENS
FLENDER Standard Couplings
Flexible Couplings — N-EUPEX and N-EUPEX DS Series
7/3
Siemens MD 10.1 · 2015
General information
7
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Benefits
N-EUPEX couplings are designed on the modular principle and
have a very simple construction. N-EUPEX types are made up of
subassemblies to suit requirements. The couplings are assem-
bled by simply fitting the coupling halves together. Wear is re-
stricted to the elastomer flexibles, which must be replaced at the
end of their service life.
Depending on type, the elastomer flexibles can be changed
without moving the coupled machines.
The coupling parts are readily available from stock and are
mostly finish-machined, i.e. with finished bore, keyway, set
screw and balancing.
Optionally:
The wear indicator for N-EUPEX couplings enables the condition
of the flexible to be easily assessed. The wear condition can also
be ascertained with the aid of a stroboscope while the coupling
is rotating. The production process can thus continue undis-
turbed.
If the stroboscope is to be used in a potentially explosive
environment, you can enquire about the equipment for this at
Siemens.
The wear indicator must be attached to the outside diameter of
the coupling after the coupling has been fitted.
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Application
The N-EUPEX coupling is available as a catalog standard in 23
sizes with a rated torque of between 19 Nm and 62000 Nm. The
coupling is suitable for use at ambient temperatures of between
-30 °C and +80 °C. By using alternative elastomer buffers, the
permissible ambient temperature range can be extended to be-
tween -50 °C and +100 °C.
Frequently, the coupling is used to connect the motor to the gear
unit input shaft. The coupling is suitable especially for drives with
uniform to average dynamic loads. Examples of applications are
pump drives, ventilator drives or crane running gear. Further-
more, N-EUPEX couplings can be used as add-on couplings,
particularly on FLUDEX fluid couplings or ARPEX AKR safety
couplings. In the case of drives with a diesel engine, N-EUPEX
couplings are suitable for driven machines with a low mass mo-
ment of inertia.
In the case of diesel engine drives, the actual dynamic coupling
load should be checked by measurement or torsional vibration
calculations.
Coupling suitable for use in potentially explosive
atmospheres.
Complies with the current ATEX Directive for:
II 2 G T4 / T5 / T6 D120 °C
-30 °C
≤
T
a
≤
+80 °C / +50 °C / +40 °C
I M2
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Function
The motor torque is transmitted to the hub at the drive end via
the shaft-hub connection, which is mostly designed as a keyway
connection. The torque is transmitted to the hub on the output
side with the aid of elastomer flexibles. The hub on the output
side further transmits the torque to the driven machine or a gear
unit placed in between. Because of the primarily compression-
loaded elastomer flexibles, the coupling has a progressive tor-
sional stiffness.
In the case of the N-EUPEX DS coupling series, the elastomer
flexible is subjected to bending and compression loads. In the
event of overload or advanced wear, the coupling disconnects
positively and the flexibles are irreparably damaged. The metal
parts then rotate without touching one another. After new elasto-
mer flexibles are fitted, the N-EUPEX DS coupling is once more
operable.
N-EUPEX DS couplings are maintenance-free, even in poten-
tially explosive environments, so long as the possible torque in-
terruption does not lead to an unacceptable disruption of the
production process.
Pocket part
(part 1, 10)
Cam part
(part 3, 4, 7)
G_MD10_EN_00176
© Siemens AG 2015