Metallic couplings
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The purpose of a metallic couplings is to accept misalignment between the shafts of the connected machines. This misalignment may take the form of an axial movement of one or both the machine shafts, an angular misalignment between them or a relative radial (parallel) offset between their axes of rotation - or indeed any combination of these three. All these being accomodated whilst the metallic couplings are rotating at speed and transmitting the machine torque.
During installation the metallic couplings will usually be asked to accommodate some level of error in the set distance between the two machinery shafts. In addition, during operation, one of both of the machine shafts may move axially due to thermal (or other) influences. In both cases the coupling discs accommodate the misalignment by bending of the disc spans. In most normal applications this combined axial deflection does not vary rapidly and, as such, can be considered as introducing steady stress.
The basic principle of the metallic couplings dictates that, for a fixed bolt circle diameter, the greater the number of bolts the higher the torque that can be transmitted but with a reduction in the level of misalignment that can be accommodated. Euroflex Transmission in their design philosophy assess the requirements of each application and offer a solution incorporating the most advantageous combination of bolting arrangement to cover torque and misalignment considerations.