www.jbj.co.uk/couplings.html#flender 32 #DriveLineHarmony N-Eupex DK Torsionally Flexible Couplings guarantees increased damping over the entire drive train. In addition, due to the double-cardanic design, significantly lower restoring forces are generated. The high ratio of shaft and joint clearance also decreases the restoring forces. Depending on size, offset and installation dimensions, the restoring forces decrease by more than half. The result is a lower load on the shafts along with a lower load on the bearings. This is advantageous especially with thinner shafts, which can be damaged due to the wrong coupling design or improper installation, even up to the breakage point. The spacer, made of aluminumwith a joined pocket part made of gray cast iron, comes in standard increments for shaft spacing from 100 mm to 250 mm, so its length can be adapted to the customer's design. Here a special design feature, unique on the market and immediately noticeable, is the complete encapsulation of the elastomer elements. This covering prevents the sleeve from flying off if components break due to improper overload. In contrast to other solutions on the market, the elastomer elements are not located within the shaft diameter, but instead, outside of it. A greater distance from the axis of rotation means a lower load on the outer wall and, as a result, less wear. Due to this clearance, together with the decreased tendency of the 90 Shore A elements to undergo working in case of shaft offset, the elements have a longer service life, which increases the availability of the coupling. The standard use of elastomer elements with a hardness of 90 Shore A achieves a good compromise between damping and rigidity. Two springs connected in a series significantly reduce torsion spring rigidity. The N-EUPEX DK has a plastic cover on both sides of the spacer to prevent steel-to-steel contact in case of axial displacement. The cover also provides dust protection. Type DK couplings in the size range from 68 to 225 are appropriate for long and trouble-free operation, particularly for pump applications, because they enable compensation for large shaft offsets as a consequence of thermal expansion, for example. Due to very low restoring forces, the coupling provides a smooth solution in difficult and demanding cases. Moreover, the ATEX coupling is certified, so it is suitable for use in potentially explosive areas. 1.2 Split hub With the split hub, assembly and disassembly are simple and inexpensive, requiring only that the two half shells be connected or separated. The coupled drive and work machines do not have to be moved. In comparison with the conventional hub design, this saves up to half of the time required. For example, to exchange a pump, only the locating screw of the respective half shells has to be loosened. Then the hub can be easily removed. After the new pump is mounted or attached, the two half shells of the split hub can be simply placed in position and screwed together. The same is true for exchanging the elastomer elements, whichmust be replaced at specified intervals depending on operating behaviour and wear condition. Anew feature is that the half shells in the parallel keyway are split. When the clamping screws are tightened, the half shells are centred above the parallel key, which guarantees that the halves are positioned properly with respect to each other. A positive side effect here is that the keyed joint is constructed so that there is no backlash.
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