Jaw Type Coupling Selection Process The selection process for determining the proper jaw coupling size and elastomer requires using the charts shown on the following pages. There are three components to be selected, two hubs and one elastomer. When the shaft size of the driver and driven of the application are of the same diameter, the hubs selected will be the same. When shaft diameters differ, hubs selected will differ accordingly. Information necessary before a coupling can be selected: ■ HP (or KW) and RPM or Torque of driver ■ Shaft sizes of driver and driven equipment and corresponding keyways ■ Application description ■ Environmental conditions (i.e. extreme temperature, corrosive conditions, space limitations) Steps In Selecting A Jaw Coupling Step 1: Determine the Nominal Torque of your application by using the following formula: Nominal Torque = in-lb = (HP x 63025) RPM Nm = (KW x 9550) RPM Step 2: Using the Application Service Factors Chart 1 (page 8) select the service factor which best corresponds to your application. Step 3: Calculate the Design Torque of your application by multiplying the Nominal Torque calculated in Step 1 by the Application Service Factor determined in Step 2. Design Torque = Nominal Torque x Application Service Factor Step 4: Using the Spider Performance Data Chart 2 (page 9), select the elastomer material which best corresponds to your application. Step 5: Using the Jaw Nominal Rated Torque Chart 3 (page 9), locate the appropriate elastomer material column for the elastomer selected in Step 4. Scan down this column to the first entry where the Torque Value in the appropriate column is greater than or equal to the Design Torque calculated in Step 3. Once this value is located, refer to the corresponding coupling size in the first column of the Jaw Nominal Rated Torque Chart 3 (page 9). List of Charts provided for Selection: ■ Chart 1– Application Service Factors (page 8) ■ Chart 2 – Spider Performance Data (page 9) ■ Chart 3 – Jaw Nominal Rated Torque (page 9) ■ Jaw Type Performance Ratings (page 22) Formulas: Nominal Torque = in-lb = (HP x 63025) RPM Nm = (KW x 9550) RPM Design Torque = Nominal Torque x Application Service Factor Refer to the maximum RPM value (page 22) for this elastomer torque capability to ensure that the application requirements are met. If the requirement is not satisfied at this point, another type of coupling may be required for the application. Please consult Lovejoy engineering for assistance. Step 6: Compare the application driver/driven shaft sizes to the maximum bore size available on the coupling selected. If coupling bore size is not large enough for the shaft diameter, select the next largest coupling that will accommodate the driver/driven shaft diameters. Refer to Chart 3 (page 9). Step 7: Using the UPC number selection table (pages 11 or 12), find the appropriate Bore and Keyway sizes required and locate the Lovejoy UPC number. 6 #DriveLineHarmony www.jbj.co.uk/spider-couplings.html Straight Jaw Spider Couplings Selection Process
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