The hardness of the standard spider is 92° Shore A (yellow). Spiders with a hardness of 98° Shore A (red) can be used for higher torque values. For high torque values, a spider with 64° Shore D (green) is recommended; this is extremely hard and has only a slight damping effect. As deformation progresses, the crowned teeth of the spider absorb deformation energy at a disproportionally increasing rate. Consequently, the coupling action at low torque transmission rates is relatively soft, becoming harder as torque increases. The result is a progressive spring characteristic curve. A particular advantage of this progressive spring characteristic curve is the resonance behaviour of the DELTEX coupling.

In this way, the progressive spring characteristic prevents, above all, any impermissible overloading of the coupling. The spring rigidity can also be influenced by selection of an appropriate Shore hardness. A higher Shore hardness shifts the natural frequency to a higher range, while a lower Shore hardness shifts it to lower range. If in doubt, we recommend that you calculate the system using the respective mass inertia moments of the driving and driven sides. 4 Standard DELTEX Wellenkupplung NBL spielfreie Ausführung