Coupling suitable for use in potentially explosive atmospheres. Complies with the current ATEX Directive for: II 2GEx h IICT6 ... T4Gb X II 2DEx h IIICT85 °C ... 110 °CDb X I M2 Ex hMb X N-EUPEX and N-EUPEX DS claw couplings (also known as pin / cam couplings) connect machines. They compensate for shaft misalignment, generating only low restorative forces. The torque is transmitted through elastomer elements, so the coupling has typically flexible rubber properties. N-EUPEX couplings are overload-holding. By contrast, the N-EUPEXDS series is designed so that overload or advanced wear causes irreparable damage to the elastomer elements. Themetal parts of N-EUPEXDS couplings can then rotate freely against one another without contact. Benefits N-EUPEX couplings are designed on the modular principle and have a very simple construction. N-EUPEX types are made up of subassemblies to suit requirements. The couplings are assembled by simply fitting the coupling halves together. Wear is restricted to the elastomer elements, which must be replaced at the end of their service life. Depending on type, the elastomer elements can be changed without moving the coupledmachines. The coupling parts are readily available from stock and aremostly finish-machined, i.e. with finished bore, keyway, set screw and balancing. Please note that if the couplings are finished machined / bored and keyed in the jbj Techniques machine shop, the couplings will be supplied un-balanced, unless specifically requested. Application The N-EUPEX coupling is available as a catalogue standard in 23 sizes with a rated torque up to and 85,000 Nm. The coupling is suitable for use at ambient temperatures of between -30 °C and +80 °C. By using alternative elastomer elements, the permissible ambient temperature range can be extended to between -50 °C and +100 °C. Frequently, the coupling is used to connect the motor to the gear unit input shaft. The coupling is suitable especially for drives with uniform to average dynamic loads. Examples of applications are pump drives, ventilator drives or crane running gear. Furthermore, N-EUPEX couplings can be used as add-on couplings, particularly on FLUDEX fluid couplings or ARPEX AKR safety couplings. In the case of drives with a diesel engine, N-EUPEX couplings are suitable for driven machines with a low mass moment of inertia. In the case of diesel engine drives, the actual dynamic coupling load should be checked by measurement or torsional vibration calculations. Design andConfigurations N-EUPEX and N-EUPEX DS couplings consist of two hub parts mounted on the machine shafts. The coupling parts are connected positively by means of elastomer elements. On the two-part variant, the elastomer elements can be changed only if one of the coupled machines is moved. On the three-part variants, the bolted cam ring can be released and moved to enable the element to be changed without moving the coupled machines. 1 #DriveLineHarmony N-Eupex Series Introduction Torsionally Flexible Couplings N-EUPEX as overload-holding, fail-safe series N-EUPEX DS as overload-shedding, non-fail-safe series www.jbj.co.uk/couplings.html#flender Note aboutATEX compliance Both series are ATEX certificated, but importantly it must be noted that the N-Eupex coupling is ATEX compliant as long as the coupling is operated in accordance with the installation, operation and maintenance manual. More importantly the maintenance aspect, replacing the elastomers prior to failure. This is due to the fail-safe design allowing torque transmission should the elastomers fail. If complete ATEX safety is required, without needing to adhere to the N-Eupex maintenance requirements, then the N-Eupex DS is the coupling to use.
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