www.jbj.co.uk/couplings.html#flender 14 #DriveLineHarmony ELPEX-S Series Design & Configurations Highly Flexible Couplings Fail-safe device of ELPEX-S coupling G_MD10_XX_00023 The ELPEX-S coupling can also be designed with a fail-safe device. If the rubber disk element fails, the coupling can continue operating in emergency mode for a short time. This option is frequently 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 tometal contact. In the case of machines which excite torsional vibration, it is highly recommended carrying out a torsional vibration calculation or measuring the coupling load occurring in the drive. Function The ELPEX-S coupling's transmission characteristic is determined 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 motor or compressor flywheel. Coupling selection The ELPEX-S coupling is especially suitable for rough operating environments. An application factor lower than that in the chapter introduction is therefore sufficient for all applications. Configuration Coupling Load inContinuousOperation Internal combustion engines 1.3 1.4 1.6 Torque Characteristic of Driven Machine Uniform with Moderate Non Uniform Very Rough ShockLoads Application Factor FB Electric motors, hydraulic motors, gas and water turbines 1.0 1.3 1.4 » Uniform with moderate shock loads: generators, fans, blowers. » Non uniform: reciprocating compressors, mixers, conveyor systems. » Very harsh: crushers, excavators, presses, mills. Examples of torque characteristic in driven machines: NR = Natural-synthetic rubber mixture. NX VMQ 1.1 1.0 1.0 1.0 1.0 1.1 1.25 1.4 1.6 VMQ = Silicone rubber. Temperature Factor FT Temperature T on the coupling a Coupling Rubber Elastomer -40°C up to -30°C up to up to up to up to up to up to up to up to version material -30°C +50°C 60°C 70°C 80°C 90°C 100°C 110°C 120°C SN, NN,WN NR 1.1 1.0 1.25 1.40 1.60 – – – – ELPEX-S Coupling size T ≥ T • FB • FT KN N
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