SIEMENS
FLENDER Standard Couplings
Highly Flexible Couplings — ELPEX-S Series
General information
11/4
Siemens MD 10.1 · 2015
11
Further application-related coupling types are available.
Dimension sheets for and information on these are available on
request.
The following versions have already been implemented a num-
ber of times:
•
ELPEX-S coupling with brake drum, brake disk or flywheel
mass
•
ELPEX-S coupling with axial backlash limiter
•
ELPEX-S coupling with adapter
•
ELPEX-S coupling with bearing for mounting a cardan shaft
•
ELPEX-S coupling for engaging/disengaging during standstill
•
ELPEX-S coupling as part of a coupling combination
•
ELPEX-S coupling with fail-safe device
Fail-safe device of ELPEX-S coupling
The ELPEX-S coupling can also be designed with a fail-safe de-
vice. If the rubber disk element fails, the coupling can continue
operating in emergency mode for a short time. This option is fre-
quently required e.g. in the case of marine drives.
If the rubber disk element fails, cams transmit the torque from the
inner and outer parts of the fail-safe device.
In normal operation the torsion angle of the rubber disk element
is smaller than the gap between the cams, so there is no metal-
metal contact.
■
Function
The ELPEX-S coupling's transmission characteristic is deter-
mined essentially by the rubber disk element. The torque is
transmitted positively between the rubber disk element and the
outer flange. The outer flange can be bolted to e.g. a diesel mo-
tor or compressor flywheel.
■
Configuration
Coupling selection
The ELPEX-S coupling is especially suitable for rough oper-
ating environments. An application factor lower than that in
catalog section 3 is therefore sufficient for all applications.
In the case of machines which excite torsional vibration,
Siemens urgently recommends carrying out a torsional vi-
bration calculation or measuring the coupling load occur-
ring in the drive.
Coupling load in continuous operation
Examples of torque characteristic in driven machines:
•
uniform with moderate shock loads: generators, fans, blowers
•
non uniform: reciprocating compressors, mixers,
conveyor systems
•
very rough: crushers, excavators, presses, mills
NR
= natural-synthetic rubber mixture
VMQ
= silicone rubber
G_MD10_XX_00023
Application factor FB
Torque characteristic of the driven machine
Torque characteristic
of the driving machine
uniform with
moderate shock
loads
non uniform
very rough
Electric motors,
hydraulic motors,
gas and water turbines
1.0
1.3
1.4
Internal combustion
engines
1.3
1.4
1.6
Temperature factor FT
Temperature
T
a
on the coupling
Coupling
Rubber
version
Elastomer
material
-40
to
-30 °C
-30
to
+50 °C
to
60 °C
to
70 °C
to
80 °C
to
90 °C
to
100 °C
to
110 °C
to
120 °C
ELPEX-S
SN, NN, WN
NR
1.1
1.0
1.25
1.40
1.60
ELPEX-S
NX
VMQ
1.1
1.0
1.0
1.0
1.0
1.1
1.25
1.4
1.6
Select coupling size with:
T
KN
≥
T
N
⋅
FB
⋅
FT
© Siemens AG 2015