FLENDER Standard Couplings Highly Flexible Couplings — ELPEX-S Series © Siemens AG 2015 General information Further application-related coupling types are available. Dimension sheets for and information on these are available on request. Fail-safe device of ELPEX-S coupling 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 G_MD10_XX_00023 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 Coupling load in continuous operation 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. Torque characteristic of the driving machine uniform with moderate shock loads non uniform very rough 11 Electric motors, hydraulic motors, gas and water turbines 1.0 1.3 1.4 Internal combustion engines 1.3 1.4 1.6 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 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 NR = natural-synthetic rubber mixture VMQ = silicone rubber Select coupling size with: T KN ≥ T N ⋅ FB ⋅ FT 11/4 Siemens MD 10.1 · 2015 Application factor FB Torque characteristic of the driven machine Temperature factor FT Temperature Ta on the coupling Coupling Rubber version Elastomer material -40 to -30 °C -30 to +50 °C to 60 °C to 70 °C to to 80 °C 90 °C to to 100 °C 110 ° to C 120 °C