SIEMENS
FLENDER Standard Couplings
Flexible Couplings — RUPEX Series
General information
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Siemens MD 10.1 · 2015
8
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Overview
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
RUPEX pin and bush couplings link machine shafts and com-
pensate for shaft misalignment with weak restorative forces.
The torque is conducted through elastomer buffers, so the cou-
pling has typically flexible rubber properties.
Thanks to their robust design, RUPEX couplings are also suit-
able for rough operating conditions.
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Benefits
RUPEX couplings can also hold loads when overloaded and are
therefore especially suitable for drives for special safety and re-
liability requirements.
Torque shock loads and changing loads are no problem for
robust, compact flexible RUPEX couplings.
The steel variant is also especially suitable for high-speed
drives.
RUPEX couplings are fitted by putting together the coupling
halves. Fitting with low torsional backlash is simplified by the
barrel-shaped geometry of the buffers.
RUPEX couplings require little maintenance. Only the elastomer
buffers, as wear parts, need be replaced and the coupled ma-
chines need not be moved to do so.
RUPEX couplings are suitable for reversing operation and hori-
zontal and vertical fitting or fitting at any required angle.
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Application
RUPEX couplings are available as a catalog standard in 26 sizes
with a rated torque of between 200 Nm and 1300000 Nm.
The coupling is suitable for use at ambient temperatures of be-
tween -30 °C and +80 °C. By using alternative elastomer buf-
fers, the permissible ambient temperature range can be ex-
tended to between -50 °C and +100 °C.
Frequently, the coupling is used to connect the gear shaft to the
driven machine. In the case of drives without gear units, the cou-
pling is particularly suitable for operation in rough conditions or
heavy-duty drives with electric motor drive. Ventilator drives with
high ventilator mass and drives in the cement industry are typi-
cal applications.
Examples of particularly safety-relevant areas of application are
cable railway drives, lifting gear for crane drives or escalator
drives.
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Design
A RUPEX coupling comprises two hub sections which are
mounted on the machine shafts. The hub parts are connected
positively by steel pins and elastomer buffers. The coupling can
be fitted with add-on parts such as brake disks or brake drums.
Up to size 360, the pins and buffers are fitted on one side. From
size 400 up, the pins and buffers are fitted in the hubs on alter-
nate sides.
Materials
Hubs
•
Types RWN and RWB made of grey cast iron EN-GJL-250
•
Types RWS and RBS made of steel
Flange
•
Types RFN, RFS made of steel
Pin
Material steel 42CrMo4, surface fine-machined
Buffer material
Brake disks
•
Type RWB made of EN-GJS-400 spheroidal graphite cast iron
•
Type RBS made of steel
Brake drums
•
Type RWB made of EN-GJL-250 grey cast iron
•
Type RBS made of steel
Material/description
Hardness
Identification
Ambient
temperature
NBR
standard type
80
ShoreA
Buffer black
-30 °C ... +80 °C
NBR
electrically insulating
80 ShoreA
Buffer green
-30 °C ... +80 °C
NBR
soft
65 ShoreA
Buffer black with
green dot
-30 °C ... +80 °C
NBR
hard
90 ShoreA
Buffer black with
magenta dot
-30 °C ... +80 °C
NR
for low temperature
80 ShoreA
Buffer black with
white dot
-50 °C ... +50 °C
HNBR
high temperature
80 ShoreA
Buffer black with
red dot
-10 °C ... +100 °C
© Siemens AG 2015