an axial clutch has to transmit rotation 200 rpm with a torq

an axial clutch has to transmit rotation 200 rpm, with a torque capacity of 400 N-m. The friction surfaces have a coefficient of friction of 0.15, maximum allowable velocity of 24 m/sec, maximum allowable pressure of 800 kPa and PV rating of 2 MPa m/sec. The outer diameter of the friction disk is not more than 24 cm and the inner diameter is not less than 18 cm.a) For a safety factor of 1.2, find the ( minimum) needed number of pairs of friction surfaces ? b) What are then the internal and external diameters if a minimum actuating force is required ?c) What is then the actuating force ?

Solution

an axial clutch has to transmit rotation 200 rpm, with a torque capacity of 400 N-m. The friction surfaces have a coefficient of friction of 0.15, maximum allowable velocity of 24 m/sec, maximum allowable pressure of 800 kPa and PV rating of 2 MPa m/sec. The outer diameter of the friction disk is not more than 24 cm and the inner diameter is not less than 18 cm.a) For a safety factor of 1.2, find the ( minimum) needed number of pairs of friction surfaces ? b) What are then the internal and external diameters if a minimum actuating force is required ?c) What is then the actuating force ?