A flange coupling is to connect two 57 mm shafts. The hubs of the coupling are each 111 mm in diameter and 92 mm hub length. Six 16-mm bolts in a 165-mm diameter bolts circle connect the flanges. The keyway is 6 mm shorter than the hub length and the key is 14 mm x 14 mm. Coupling is to transmit 45 kW at 160 rpm. For all parts, yield point value in shear is one-half the yield point value in tension or compression that is 448 MPa. Find a) the shearing stress of key and its factor of safety; b) the bearing stress of key and the factor of safety based on yield point; c) the shearing stress in bolts and factor of safety based on yield point. (Board problem, November 1983)

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Clutches, Brakes, Couplings, and Flywheels

The clutch is described as a machine element used to connect or disconnect two shafts together to transmit torque or power. The clutch works on the principles of friction. The clutch is commonly used in automobiles to transfer power from the driving shaft to the driven shaft.