The Huco Dynatork MS worm gearbox with integral torque limiter is useful for safeguarding machinery and operatives by stopping rotation of the low-speed shaft whenever the stall torque exceeds the calibrated value of the internal torque limiter.
Of course, in the event of a power cut, this safety gearbox effectively locks and, in the majority of applications, this is an appropriate consequence. For others, however, it is a disadvantage.
Take, for example, a motorised factory door. Under normal circumstances the MS gearbox would ensure safe operation, but a loss of power can leave the door stuck open or closed. And it is for applications such as this that Huco Dynatork has introduced the MRV50.LS safety worm gear box with disengaging torque limiter. A disengaging lever provides a manual override so that, in this application example, the door can still be operated until power is restored.
This is just one of many applications that will benefit from this new introduction. Indeed it is claimed that there is no other comparable product available. The alternatives are disengaging couplings or electromagnetic clutches, but neither has the simplicity nor the cost-efficiency of the MRV50.LS.
The built-in torque limiter comprises a symmetrical cone on the output shaft acting against a hollow cone on the worm wheel, all rotating in an oil bath. This gives precise adjustment and consistency in the slipping point during torque overload. The low contact pressure between the conical hub and the worm wheel of the gearbox make constant adjustment unnecessary during the life of the product. Thanks to use of quality materials and the inclusion of an oil bath, component wear is greatly minimised.
Disengaging models are available for single-, three-phase and dc operation, with 40-80mm centres; power range is 0.09-3kW.
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