Mechanical Power Transmission Disc Couplings Selection Process 6 Disc Coupling Selection Process 1) Determine coupling type suitable for application. Angular, axial and parrallel misalignment properties need to be considered. Size will be determined by the selection torque and shaft diameters. 2) Next, calculate the application torque and apply the service factor to calculate the selection torque. Application torque Application torque x service factor = selection torque 3) Use the relevant table on the relevant page for model of coupling for torque rating and shaft size. Sometimes to have the right bore size it may be necessary to have a coupling with more than sufficient torque capabilities. 4) Ensure selected coupling has sufficient speed rating using tables provided. 5) To determine if the coupling will handle the parallel misalignment, use the trig function of tan 1° = offset allowed for 25.4 mm = 0.0174 Multiply the 0.0174 x the distance between disc packs or ‘S’ dimension from the table on page 13. Recommended Information Needed to Specify a Disc Coupling from jbj Techniques Limited. The following information should be provided when placing an order to ensure the proper selection of the disc coupling: » Application and type of duty » Type of driver (engine, motor, turbine, etc.) » Speed and horsepower » Type of driven equipment » Shaft sizes and separation » Space limitations for major diameter and length » Type of fit (Interference fit default, clearance fit and shaft locking device preparation available upon request) » Special requirements (vertical mounting, drop out center, flange mount, electrically insulated, API-610 up to 3,800 RPM, shear pins, balancing, etc.) Nm = (kW x 9550) RPM www.jbj.co.uk/disc-couplings.html #DriveLineHarmony
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