Shaft Couplings

CouplingsSince mechanical drives were invented there has been a need to couple driving parts together, so the range of couplings available is reflected in this. There are a variety of flexible and rigid couplings, the most widely used being the flexible coupling, which has the ability to be able to compensate for a small amount of mis-alignment.

These photographs show examples of the most popular couplings that we supply, but we also supply many special and non-standard items. They are normally bored and keyed to suit the shafts that the hubs are being fitted to, or they use standard tapered bushes in a similar manner to taper bored pulleys and sprockets.

Rigid shaft couplings are usually only available pilot bored, so machining will be necessary to enable them to fit the required shaft diameter. It is also important that the shafts are aligned perfectly. However, a rigid shaft coupling allows for torque limiting as a safety factor. This can be from friction plates that will slip when a certain torque is reached, or shear pins that will break at a certain torque. The advantage of this feature is that, for example, if you have an electric motor driving a conveyor system, and the conveyor jams or otherwise becomes overloaded, when the preset torque is reached the connection between the two shafts will be severed, and this prevents the motor from damage as well.

Flexible shaft types are more common. They offer the advantage of being able to compensate for minor shaft misalignments. There are numerous designs, but the majority feature two hubs (usually metal – one for each shaft) and a cushioning element that fits between them. This element is pliable and it is this that compensates for the misalignment in the shafts, as well as absorbing the backlash from when rotation is started or stopped. The hubs can be pilot-bored, or often they are also available to take a taper lock bush, which lets shafts of different diameters to be coupled together. The most common types of flexible couplings include HRC, Beam, Tyre, and Essex type.

Catalogues
All of our catalogues are available to download in PDF format. To view our catalogues see links to the main Drives, Controllers and Couplings catalogue and main Shaft Coupling sections below.

Full Catalogue
Drives, Controllers and Couplings

Shaft Coupling Catalogue Sections
Shaft Couplings – Chain Couplings
Shaft Couplings – Tyre Couplings
Shaft Couplings – Jaw Couplings
Shaft Couplings – HRC Couplings
Shaft Couplings – Nylon Sleeve Gear Couplings

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