www.jbj.co.uk/couplings.html#flender 33 #DriveLineHarmony ELPEX Series Design & Configurations Highly Flexible Couplings Types ENGS and EFGS are provided with a fail-safe device. In normal operation the torsion angle of the flexible rings is smaller than the gap between the cams. In normal operation there is nometal-metal contact. If the flexible rings fail, cams transmit the torque from the inner part and outer part. These enable the coupling to be used in emergency mode for a short time. This option is frequently required e.g. in the case of marine drives. Fail-safe device of ELPEX coupling G_MD10_XX_00040 A A A - A Fail-safe device Coupling load in continuous operation Coupling Selection The ELPEX-S coupling is especially suitable for rough operating environments. An application factor lower than that in Chapter E is therefore sufficient for all applications. Configuration In the case of machines which excite torsional vibration, It is highly recommended to carry out a torsional vibration calculation or measure the coupling load occurring in the drive. The operating principles of the driving and driven machines are divided into categories and the application factor FB derived from these in accordance with DIN 3990-1. Electric motors, hydraulic motors, gas and water turbines 1.0 1.3 1.4 Internal-combustion engines 1.3 1.4 1.6 Torque characteristic of the driven machine Uniform with moderate shock loads Non uniform Very rough Application Factor FB Temperature factor FT Temperature Ta on the coupling Coupling Elastomer -40 up to -30 °C -30 up to +50 °C up to 60 °C up to 70 °C up to 80 °C ELPEX NR 1.1 1.0 1.25 1.40 1.60 NR = Natural rubber mixture Coupling size T ≥ T • FB • FT KN N 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.
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