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OEM Update
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FLEXIBLE COUPLINGS TO IMPROVE DRIVE SYSTEM

March 11, 2011 11:39 am

Today the customers need optimum integration of a coupling into the drive concerned. Kumar Karandikar, Sales Manager of KTR India outlines the unique advantages of flexible coupling
 
For all those traditional applications operating with either rigid connections or belt driven machines, sources of failures should be excluded as far as possible or as long as they are acceptable from an economic point of view. Failures always cause incredible expenses of repair and lose of productivity. In addition to preventing dangers, superfluous noise should be avoided, too.
 
Things can often be put right by the use of a flexible coupling originating from KTR’s extensive programme.
 
Rigid connections or couplings
Connections realized by a rigid sleeve are mainly used in the low cost segment. In such cases only low operating performances of partly less than 50 hours are assumed. The reason is often benefit in price or compactness only, however with this, considerable disadvantages may arise. If two shafts are combined by means of a rigid sleeve, torque peaks are transmitted without any damping and peak loads are transmitted directly to the adjacent components. The production of constraint forces has to be considered, too, since this type of connection is not in a position of compensating for displacement which may be caused. Such constraint forces reduce the service life of all components, the bearing and the shaft-hub-connection are loaded heavier and the feather keys break. This is also the case with agricultural engineering where the status of technology often is to combine two shafts by a rigid sleeve.
 
Instead, if KTR couplings are used to combine the shafts, the amount of wear is considerably reduced, as shown in the following figure. A high amount of wear was realized in the gearbox of an agricultural machine. Tests on a test bench have shown that the high amount of wear was caused by the combination of the shafts by means of a rigid sleeve. Having installed a ROTEX 38 with a PA6 spider by KTR, the service life of all components has considerably increased. ROTEX couplings are characterized by small dimensions, low weight and low flywheel effects while transmitting high torques. The accurate, all over machining has a positive influence on the running properties while increasing the service life of the couplings considerably. They assure power transmission while damping Torsional vibrations and compensate for shocks produced by engines with irregular operation.
 
The direct connection of driving and load side by means of hollow shaft gears which is often used by the industry is part of the rigid connections. Here a flexible separation does not take place. This means that the structure-borne noise is transmitted without any damping. The noise produced in this way may be unwanted in certain applications: In a theatre the windlasses have been connected directly to the hollow shaft gear up to now. This kind of connection has caused noise which disturbed the smooth running of the theatre. To solve this problem a flexible pin & bush coupling type REVOLEX KX 85 spec by KTR was installed between worm gear pair and windlass. The flexible separation makes the drives run at very low noise now so that the visitor of the theatre can enjoy the play without any disturbances. The torsionally flexible, fail-safe pin & bush couplings type REVOLEX KX can be plugged in axially and are characterized in particular by short dimensions. Moreover, they assure a disassembly of the elastomer rings including the pins while being assembled without any problems. In addition the couplings compensate for all kind of shaft misalignment.

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