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R+W is offering its ST torque limiters, which it claims offer benefits over shear pin and hydraulic alternatives, and are smaller than other mechanical torque limiters rated for up to 160,000Nm.

The torque limiters are lightweight for easier, quicker assembly, are easily adjustable and can be serviced in situ.

Available from sole UK distributor Tandler, the ST torque limiter is up to 23 per cent more compact, with respect to outer diameter at a given torque, by comparison with its mechanical competitors.

The R+W operating principle uses disc springs, allowing the ST’s immediate re-engagement following a stoppage.

Due to a spring-loaded ball detent design, the coupling will repeatedly disengage at exactly the same torque.

The disengagement value is easily set via the torque adjustment range that is engraved on the body of the coupling.

Dependent on the disengagement torque required, three, six or nine actuation elements are distributed around the given radius but additional elements can be retrofitted at any time.

Up to 12 actuation elements can be fitted or the number of disc springs increased to produce greater force.

Such measures can increase performance by as much as 25 per cent.

The ST torque limiters are available for torques from 1,000 to 160,000Nm in four different body sizes and shaft diameters from 40-290mm.

They are backlash and maintenance free and supplied with a torque adjustment wrench and a tool for manual disengagement and re-setting.

The ST product programme also comprises three application-specific classes.

The ST1 is for indirect drives and suitable for power transfer in heavy machine construction.

For direct drives, the ST2 includes an elastomer compensation element that accommodates axial, lateral and angular misalignment.

This feature also has the effect of filtering torque fluctuations.

Model ST3 is configured as a torsion resistant coupling.

It is characterised by exact torque transmission, durability and compensation for all three types of misalignment, with small restoring forces.

Where the ST torque limiter is to be used in aggressive, corrosive environments, a stainless-steel version can be supplied.

Atex certification for hazardous areas Zone 1/21 and Zone 2/22 is also available.

R and W Coupling Technology

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