Product Range
 
 
 
 

Torsionally Flexible Couplings
 
   
 

  1. Know your application Nomination Torque :
    Determine the Nominal Torque rating of the applications power source in Nm. Nominal Torque if not known, can be calculated using power & speed, by the following formulae:

  2. Know your application service factor :
    Determine the appropriate service factor of your application. For list of typical service factor, refer table overleaf.

  3. Calculate coupling selection torque :
    The coupling selection torque can be calculated by multiplying the service factor to the nominal torque.

   
 
 
4.

Select coupling on the basis of torque rating :
Considering the calculated coupling selection Torque, select the coupling with a rated torque equal to or greater than your calculated torque.
   
5.

Check for the maximum Bore capacity :
Check that the maximum bore capacity of the coupling you selected is equal to or larger than either of the two shafts. If necessary, select the next larger coupling that will accommodate your shaft sizes.
   
6.

Check for the Distance between shafts :
Determine desired shaft separation and check that the coupling type selected meets these requirements.
 
   
  Installation  
 
 
 

  1. Mount the coupling hubs on the shafts & insert the keys.

  2. Series N: Put the drive insert into one of the hubs, and move the hubs on the respective shafts with a slight axial force, till the jaws & the insert mate evenly with each other. If the shaft length is longer than the length through bore (dimension 'D', D1') it does not matter if one of the shaft enters the bore of the spider.

  3. a) In case of Series SWN, & all other series, where individual free floating drive inserts are used, mount the coupling hubs on the respective shafts, ensuring that the gap (dimension 'C') is correctly maintained between the coupling halves. Remember to insert the external steel collar on one half of the coupling. Using a straight edge as shown in fig.4., check the alignment at different points on the circumference of the hub, to ensure that the straight edge is in full contact with both the halves of the coupling. If required, realign the assembly till the straight edge is in full contact with both the hubs.
    b) Put the wrap-around insert or the free floating drive insets as the case may be, inside the coupling all around the periphery. Insert the drive pad with the arrow mark facing the coupling. Shift the external steel retaining collar over the drive inserts and lock the collar retaining screws securely.

  4. Accuracy of the alignment will greatly affect the service life of the insert & the coupling. The shaft ends to be coupled should be supported on both sides close to the coupling halves.

  5. If clamping hubs are uses, tighten the socket screw of the clamping hub to achieve an interference fit.

  6. a ) If KWIKFIX taper bushings are used for keyless shaft hub locking, ensure that no trace of oil or lubricant is left in the bores or the shaft. Cleaning the bore & the shaft with trychloroethylene will improve the frictional locking of the shaft & the bore. Tighten the hexagon head screws in a diametrically opposite sequence in several steps till the shaft is fully gripped in the bush.
    b) To dismantle the coupling, slacken all the hexagon head screws & insert them into two or more ejector holes provided in the KWIKFIX bushing. As the screws are tightened in the ejector holes, the KWIKFIX bushing can be pushed out of the hubs.

  7. The coupling should be appropriately covered with a guard to ensure that the rotaing parts cannot be touched

  
 

Next

  
     
Copyright © 2008 by National Engineering Company. All Rights Reserved.