ST torque limiters handle huge torques
A
Tandler Precision product story
Edited by the Engineeringtalk editorial team
Oct 5, 2009
R+W's new ST torque limiters, available from Tandler, offer benefits over shear pin and hydraulic alternatives and are smaller than other mechanical torque limiters rated for up to 160,000Nm.
These torque limiters are also lighter in weight, making assembly easier and quicker.
They are easily adjustable and can be serviced in situ.
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 difference in overall coupling weight in the most extreme case is one ton, allowing greater circumferential speed.
The size factor in particular makes the ST torque limiter easier to install.
A lighter weight drive line that can be pre-assembled is another benefit.
Lower overall weight also reduces mass moment of inertia as a consequence of lower flywheel mass.
In addition to shortening the acceleration and braking processes, the system achieves greater dynamics.
This translates into higher productivity.
A shear pin coupling by comparison may cost less but it requires considerably more time to install, adjust and put into operation.
It also demands heavy duty and specialist maintenance, a factor that is especially pronounced in the event of a stoppage.
And while a hydraulic overload coupling is extremely compact, this is counterbalanced by the need for complicated procedures following overload and the potential of oil contamination to nearby components.
The R+W operating principle utilises disc springs, allowing the ST's immediate re-engagement following a stoppage.
There is no need to replace any expendable parts such as pins or valves.
Furthermore, its disengagement does not result in hydraulic oil being sprayed onto adjacent components.
The most important factor of all is that the ST torque limiter is 100 per cent reliable.
Thanks to R+W's spring-loaded ball detent design, the coupling will disengage at exactly the same torque, again and again.
The disengagement value is easily set via the torque adjustment range 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.
If minimal space and high torque are the pre-requisites for an application, 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 in a package that includes torque limiter, torque-adjustment wrench and a special tool for manual disengagement and re-setting.
The ST product programme also comprises three application-specific classes.
The ST1 is for indirect drives and ideal for power transfer in heavy machine construction.
For direct drives, the ST2 includes in its design an elastomer compensation element that accommodates axial, lateral and angular misalignment.
This feature also filters torque fluctuations.
Model ST3 is configured as a torsion-resistant coupling.
It is characterised by exact torque transmission, exceptional durability and compensation for all three types of misalignment with very 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.
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Contact Tandler Precision
Tel +44 1604 588056
Other Tandler Precision stories
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Torque limiters keep it clean
The R+W SK range of torque limiters is characterised by its highly compact and uncomplicated design, patented backlash-free operation and millisecond disengagement. -
Redesigned gearboxes boast twice the torque
The new PowerMaster gearboxes are available in three sizes with maximum torques of 300, 640 and 1200Nm and in three ratios per size of 1:1, 2:1 and 3:1. -
Smaller torque limiters promise longer life
The latest generation of R + W torque limiters from Tandler Precision are more compact, weigh less and deliver an even longer service life than their forerunners. -
Elastomer couplings cope with sudden loads
The major advantage of R+W elastomer couplings is that they transmit high torque with no backlash while accommodating misalignment and dampening vibration. -
Gearboxes and couplings gain ATEX approval
Several types of Tandler's spiral bevel gearboxes and couplings are now ATEX rated.
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