A bushed-pin type flexible coupling is used to connect two shafts and transmit 5 kW power at 720 r.p.m. Shafts, keys and pins are made of commercial steel (S= Se = 240 N/mm) and the factor of safety is 3. The flanges are made of cast iron FG 200 (S= 200 N/mm) and the factor of safety is 6. Assume, Say = 0.5 S and S 0.5 S There are 4 pins. The pitch circle diameter of the pins is four times of shaft diameter. The permissible shear stress for pins is 35 N/mm. The permissible bearing pressure for rubber bushes is 1 N/mm. The keys have square cross-section. su Calculate: (i) diameter of the shafts; (ii) dimensions of the key; (iii) diameter of the pins; (iv) outer diameter and effective length of the bushes.
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