Elastic Couplings to Improve Drive System

September 10, 2012 8:59 am

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 for repair and loss of productivity. In addition to preventing dangers, superfluous noise should also be avoided.
Things can often be put right by the use of a flexible coupling originating from KTR’s extensive programme. KTR’s product portfolio is based on 50 years of experience in the development and production of innovative couplings transmitting torques up to 750 kNm setting trends in the market.
Rigid Connections or CouplingsConnections realised 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 (Image 2), the amount of wear would considerably reduced. A high amount of wear was realised 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 (Image 1) are characterised 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.

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