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N-EUPEX Flexible high performance Coupling

N-EUPEX and N-EUPEX DS pin couplings connect machines. They compensate for shaft misalignment, generating only low restorative forces.
The torque is conducted through elastomer flexibles, so the coupling has typically flexible rubber properties.
N-EUPEX couplings are overload-holding. By contrast, the N-EUPEX DS series is designed so that overload or advanced wear causes irreparable damage to the elastomer flexibles. The metal parts of N-EUPEX DS couplings can then rotate freely against one another without contact.
Coupling suitable for use in potentially explosive atmospheres.
Complies with the current ATEX Directive for:
II 2G Ex h IIC T6 ... T4 Gb X
II 2D Ex h IIIC T85 °C ... 110 °C Db X
I M2 Ex h Mb X

product details

Your benefits at a glance

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 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.

application

The N-EUPEX coupling is available as a catalog standard in 23 sizes with a rated torque of between 28 Nm and 71000 Nm. The coupling is suitable for ambient tempera tures of between -30 °C and +80 °C. By using alternative elastomer flexibles, 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 and configurations

The teeth are lubricated with grease. On the ZAPEX type

N-EUPEX and N-EUPEX DS couplings consist of two coupling halves mounted on the machine shafts. The

coupling parts are connected positively by means of elastomer flexibles. On the two-part variant, the elastomer flexibles 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 flexible to be changed without moving the coupled machines.

Elastomer flexible of the N-EUPEX series

The flexibles of the N-EUPEX coupling are subjected to compression. This results in progressive torsion spring characteristics. If the flexibles are irreparably damaged, the hub parts come into contact with metal. This causes the torque to continue to be transmitted in “emergency

mode” for a short period of time.

Elastomer flexible of the N-EUPEX DS series

The flexibles of the N-EUPEX DS series are subjected to compression and bending forces. A linear torsion spring

characteristic curve is characteristic in this regard. If the flexibles are irreparably damaged, the metal parts turn against one another without contact, and the power trans mission is separated. Fitting new flexibles will make the coupling once more usable. The capacity of the N-EUPEX

DS series to shed overloads is especially in demand for highly sensitive machines.

Materials

All coupling parts such as cam parts, pocket parts, spacers, hub parts and mounting parts are manufactured from high grade cast iron with lamellar or spheroidal graphite, or from steel. The sleeve pipes of the type DK spacers are made from aluminum.

Modular principle of N-EUPEX types

N-EUPEX DK/DKS

In the case of larger radial misalignment, double-cardanic N-EUPEX couplings can be supplied in addition to the modular system.

The spacer (part 60 resp. 70) is centered with the help of the N-EUPEX elastomer elements.

Any radial misalignment that emerges between the shaft ends will accordingly be equalized through a corresponding tilt angle

in the elastomer joints with this two-joint versions. In the DK version, the separated hubs (part 41) made from steel facilitate simple installation. The DKS version is characterized by a reduced shaft distance.