www.jbj.co.uk/couplings.html #DriveLineHarmony To simplify calculations, our Technical Department has drawn up a table for the coefficient K on the following page. Example calculation of minimum hub diameter Dmin Using the SIT-LOCK® 5B locking device to connect a shaft d = 50 mm with a hub made out of a material that has an elastic load σ0,2 = 500 N/mm², and a shape type and hub width equivalent to X=1. ® From the SIT-LOCK 5B 50 x 80 table, the outer diameter D is equal to 80 mm, the pressure P on the hub is equal to 70 N/mm². n In the table on the next page, by taking the P value (70 N/mm²), the X value (1) and of the elastic load σ of the hub material (500 N/mm²), coefficient K can be n 0,2 found to be 1.15. Therefore: D ≥ D • K ≥ 80 • 1.15 ≥ 92 mm min APPLICATION A X=1 APPLICATION B X=0,8 APPLICATION C X=0,6 D ≥ 2H Dmin D Dmin ≥ 2H D Dmin ≥ 2H D Dmin ≥ 2H D d Dmin ≥ H D Dmin ≥ H Formulas for Correct Use ® SIT-LOCK Keyless Locking Elements 6
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