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Elastic couplings
Elastic couplings

Elastic couplings, determining factors for choosing

The joint is a device capable of making solidarity the two shaft ends, so that one send twisting movement. There are many types of joint, among which it's necessary choosing depending by specific application requirements.

They are the most used: - hard joint (able to connect two coaxial shafts perfectly, without differences) - elastic coupling (thanks to a flexible element when the vibration absorption, main cause of breakage) - gear couplings (allow to have a slight misalignment between the two shafts) - articulated joints (allow very long transmission and compensate axial expansion) - hydraulic couplings - safety couplings - viscous couplings.

The choice is influenced by the type of irregularity that our transmissione is subjected: you may have, in fact, irregularity or positioning operation. In the first case the trees are not perfectly aligned, while in the second the joint is subjected to tension, bumps or tears. Of course, each joint can withstand a given torque, given by service factors and influenced by the diameter of the shaft and from stress.

You must first consider the size of the joint that transmit the necessary torque, using the actual available power of the driving machine rather than the power consumed by the driven machine, as long as the latter does not exceed. Set the HP or KW to be transmitted, divide these for the rotational speed to obtain the nominal power in HP or KW to a tour/1 '; multiply and then the same for the service factors.

After taking into account the flexibility with an investigation of the movements of the axis and compared these movements with the misalignment of the coupling size allowed by the chosen, make sure that the hole of the hub is suitable for the tree on which it is mounted.

If after doing the choice are acceptable other factors such as weight, inertia and torsional rigidity, we can proceed to the choice of the coupling. As you can see, this calculations to be carried out are extremely complex, since the choice of the joint is affected by numerous and important technical factors: for this you should, generally, to avail itself of the advice of specialists.


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