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Torque limiters can be mounted on gearbox input shafts

12 July 2015

While the ideal place for torque limiting is usually at the output shaft of the gearbox, mounting here can be impractical if high torque conditions demand large and costly torque limiters.

The new range of ComInTec PR torque limiters, now available in the UK from Techdrives, gets round this problem with a design suited to B5 mounting at the high speed input shaft to the gearbox. This offers a more cost-effective solution for machine protection, particularly when used with efficient gearboxes - helical and helical bevel designs, for example.

PR torque limiters with B5 aluminium housing are easily mounted between the motor and gearbox, and are suitable for frame sizes from 63 to 180. The assembly comes with a proximity switch set to sense an overload with the trip torque pre-set to customer requirements.

Compared with mounting at the output of the gearbox, the required trip torque is much reduced as a result of the gear ratio (ComInTec offers a trip range from 3 to 720Nm). PR torque limiters are backlash free with single position engagement. They are highly sensitive, thanks to the use of disc springs, and a negative spring rate means that the residual torque drops sharply following an overload condition. Re-engagement is automatic.

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