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Curved jaw couplings for a wide variety of applications

31 October 2015

Curved jaw types of flexible shaft coupling consist of two hubs and a central polyurethane element with curved faces.

Techdrives offer curved jaw couplings in simple up to high performance designs suiting shafts from 3 to 90mm diameter.

The curved shape of the polyurethane elements ensure that surface loads are spread and always in compression. This leads to long service life and aids flexibility giving a typical misalignment capacity of 1 to 1.5 degrees.

Coupling characteristics can be modified by changing the hardness of the element. Techdrives offer a ‘yellow’ softer element with hardness of 92 Shore A. This results in medium levels of torque and softness.  Interchangeable is a ‘red’ element that is harder at 98 Shore A resulting in about 40 percent more rated torque and double the stiffness.

The hubs for basic couplings have cast jaws to minimise costs. They are supplied in either aluminium or cast iron and fixed to shafts with a keyway and grubscrew. Higher performance versions have aluminium hubs that are split with a side clamping bolt to achieve a clamp connection to the shaft without a keyway.

Note that the transmittable torque may be limited by the shaft diameter.  These hubs have fully machined jaws resulting in zero backlash. They are proven as a good low-cost solution for reversing servo drives.

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