FLENDER Standard Couplings Flexible Couplings — N-EUPEX and N-EUPEX DS Series © Siemens AG 2015 General information ■ 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 assem- bled by simply fitting the coupling halves together. Wear is re- stricted to the elastomer flexibles, which must be replaced at the end of their service life. Depending on type, the elastomer flexibles can be changed without moving the coupled machines. The coupling parts are readily available from stock and are mostly finish-machined, i.e.
with finished bore, keyway, set screw and balancing. The wear indicator for N-EUPEX couplings enables the condition of the flexible to be easily assessed. The wear condition can also be ascertained with the aid of a stroboscope while the coupling is rotating. The production process can thus continue undis- turbed. Optionally: If the stroboscope is to be used in a potentially explosive environment, you can enquire about the equipment for this at Siemens. Pocket part (part 1, 10) Cam part (part 3, 4, 7) G_MD10_EN_00176 7 The wear indicator must be attached to the outside diameter of the coupling after the coupling has been fitted.
■ Application The N-EUPEX coupling is available as a catalog standard in 23 sizes with a rated torque of between 19 Nm and 62000 Nm. The coupling is suitable for use at ambient temperatures of between -30 °C and +80 °C. By using alternative elastomer buffers, the permissible ambient temperature range can be extended to be- tween -50 °C and +100 °C. In the case of diesel engine drives, the actual dynamic coupling load should be checked by measurement or torsional vibration calculations. 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. Further- more, 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 mo- ment of inertia. Coupling suitable for use in potentially explosive atmospheres. Complies with the current ATEX Directive for: II 2 G T4 / T5 / T6 D120 °C -30 °C ≤ T a ≤ +80 °C / +50 °C / +40 °C I M2 ■ Function The motor torque is transmitted to the hub at the drive end via the shaft-hub connection, which is mostly designed as a keyway connection.
The torque is transmitted to the hub on the output side with the aid of elastomer flexibles. The hub on the output side further transmits the torque to the driven machine or a gear unit placed in between. Because of the primarily compression- loaded elastomer flexibles, the coupling has a progressive tor- sional stiffness. In the case of the N-EUPEX DS coupling series, the elastomer flexible is subjected to bending and compression loads. In the event of overload or advanced wear, the coupling disconnects positively and the flexibles are irreparably damaged. The metal parts then rotate without touching one another.
After new elasto- mer flexibles are fitted, the N-EUPEX DS coupling is once more operable. N-EUPEX DS couplings are maintenance-free, even in poten- tially explosive environments, so long as the possible torque in- terruption does not lead to an unacceptable disruption of the production process. 7/3 Siemens MD 10.1 · 2015