4.2 High-quality elastomersmade of NBR or TPU In the N-EUPEX, torque is transferred by highly advanced elastomer elements – flexible coupling assemblies made of synthetic rubber. The special design of the N-EUPEX allows the elastomer element to have just the right amount of space it needs to deflect under load with simultaneous offset. The coupling reacts as follows in the event of radial shaft offset: While the pins and the assembly form an interlocking connection, the deformation of the rubber compensates for the corresponding offset. Each rotation rolls the elastomer element. No abrasive wear occurs within the permitted range of offset values. In case of angular offset between shafts, a horizontal compensation procedure is performed which also rolls the elastomer element without abrasive friction. Thanks to the elastomer elements, the N-EUPEX has very good damping capacity. This significantly reduces the disruption of alternating torque during start-up situations with an asynchronous motor. In addition, selecting the right Shore hardness can create distance between the drive’s natural frequency and that of the exciting frequency and thus prevent a critical resonance situation. The wear is limited to the elastomer elements, which must be replaced at the end of their service life. Depending on the type, the elastomer elements can be exchanged without moving the coupled machines. As an addition to the previously used rubber elements made of NBR, users can now also benefit from the advantages of the new elastomers made of TPU. These thermoplastic polyurethane elastomers (TPU) are already used in the cam rings of another Flender coupling. With the use of TPU elastomers, power density can be increased. The TPU elements are available in sizes 80 to 280. From size 315, the developers have come up with a special trick and combine the familiar NBR element with fabric inserts in order to be able to increase the torque capacity. Both variants, TPU or NBR elastomer with fabric inserts, are answers to the market demand for compact couplings. R & D engineers at Flender are systematically working to further increase the variety of combinations and ® the flexibility of this driveline technology. This includes the N-EUPEX modular system which is continuously growing and, with its detailed solutions, provides users with a wide range of sustainable options for making their machines and systems even more reliable, robust and efficient. #PROGRESSION~N-Eupex Torsionally Flexible Couplings www.jbj.co.uk/couplings.html#flender 42 #DriveLineHarmony
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