Shaft couplings

To select the best coupling for your application, many things can play a role during the selection proces. Sometimes it is really easy and the selection is done just by calculating the torque, speed and applicable service factor.

The torque can be calculated as follows:

M[Nm]= P[kW] x 9550 / n[rpm]

The most important selection criteria are:

The torsional stiffness, backlash / backlashfree and failsafe. But other features can also play a major role in your decision. Single flexing or double flexing (in case of single flexing couplings, the coupling will only allow angular misalignment, while double flexing couplings also accept parallel misalignment).

Is simple mounting possible? Should the hubs be heated to shrink the hubs on the shaft or is it prefered to mount the hubs without temperature difference, what is the nominal speed (is it important that the parts are well balanced or what is the potential unbalance), is it a typical strongly changing loads (torsional vibrations). Is it prefered that the coupling can be assembled axially (plug in variation). In what way should the allignment be organized? Is the allignment organized by pilots, or is the to be connected equipment not aligned at all, or is there equipment mounted on an instable fixture (for example in case of shockabsorbers). If there is an emergency stop in the system, what are the occuring torques in case of an emergency stop. Is there a big difference in moments of inertia between the driving and the driven equipment?

In certain circumstances, some specifications are applicable, like API (American Petroleum Institute) or in case of risk of explosions, or lightly inflamable products so called Ex area's. But other criteria can also play a role. Ambient temperature, maintenance interval, hygienic environment and other criteria.

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