Mechanical Power Transmission S-Flex Couplings Selection Process 6 S-Flex Endurance Coupling Selection Process The selection process for determining the proper S-Flex coupling requires using the charts shown on the following pages. There are three components to be selected, two flanges and one sleeve. Information necessary before a coupling can be selected: » kW/HP and RPM of Driver or running torque. » Shaft size of Driver and Driven equipment and corresponding keyways. » Application or equipment description. » Environmental conditions (i.e. extreme temperature, corrosive conditions, space limitations). List of Charts provided for Selection: » Chart 1 -Application Service Factors page 7 » Chart 2 - Sleeve Performance Data page 8 » Chart 3 - S-Flex Nominal Rated Torque Data page 8 Formulas: Nominal Torque Nm= (kWx 9550) RPM in-lb= (HP x 63025) RPM Design Torque = Nominal Torque xApplication Service Factor Steps in Selecting n S-Flex Endurance Coupling 1) Determine the Nominal Torque using the formula shown above. 2) Using theApplication Service Factor Chart 1 page 7 select the service factor which best corresponds to your application. 3) Calculate the Design Torque of your application by multiplying the Nominal Torque calculated in Step 1 by theApplication Service Factor determined in Step 2. Design Torque = Nominal Torque xApplication Service Factor. 4) Using the Sleeve Performance Data Chart 2 page 8 select the sleevematerial which best corresponds to your application. 5) Using the S-Flex Nominal Rated Torque Chart 3 page 8 locate the appropriate sleevematerial column for the sleeve selected in Step 4. 6) Scan down this column to the first entry where the Torque Value in the column is greater than or equal to the Design Torque calculated in Step 3. Refer to the maximum RPM value of the coupling size to ensure that the application requirements are met. If the maximum RPM value is less than the application requirement, S-Flex couplings are not recommended for the application. Note: If Nominal Torque is less than 1/4 of the coupling’s nominal rated torque, misalignment capacities are reduced by 1/2. Once torque value is located, refer to the corresponding coupling size in the first column of the S-Flex Nominal Rated Torque Data Chart 3 page 8. 7) Compare the application driver/driven shaft sizes to the maximum bore size available on the coupling selected. If coupling max bore is not large enough for the shaft diameter, select the next largest coupling that will accommodate the driver/driven shaft diameters. 8) Using the ItemSelection tables, find the appropriate Keyway and Bore size required and locate the Lovejoy UPC number. For assistance inmaking the correct selection please contact the jbj Techniques technical office, telephone: +44 (0)1737 767493 or email: info@jbj.co.uk www.jbj.co.uk/s-flex-couplings.html #DriveLineHarmony
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