3 EW) 24. A centrifugal clutch has four blocks which slide radially in a spider keyed to the driving shaft and make contact with the internal cylindrical surface of a drum keyed to the driven shaft. When the clutch is at rest each block is pulled against a stop by a spring so as to leave a radial clearance of 6 mm between the block and the drum. The pull exerted by the spring is then 450 N and the mass centre of the block is 200 mm from the axis of the clutch. If the internal diameter of the drum is 500 mm, the mass of each block is 7 kg, the stiffness of each spring is 35 kN/m and the coefficient of friction between block and drum is 0-3, find the maximum power the clutch can transmit at 500 rev/min. (I. Mech. E.) (Ans.: 51-7 kW)

3 EW) 24. A centrifugal clutch has four blocks which slide radially in a spider keyed to the driving shaft and make contact with the internal cylindrical surface of a drum keyed to the driven shaft. When the clutch is at rest each block is pulled against a stop by a spring so as to leave a radial clearance of 6 mm between the block and the drum. The pull exerted by the spring is then 450 N and the mass centre of the block is 200 mm from the axis of the clutch. If the internal diameter of the drum is 500 mm, the mass of each block is 7 kg, the stiffness of each spring is 35 kN/m and the coefficient of friction between block and drum is 0-3, find the maximum power the clutch can transmit at 500 rev/min. (I. Mech. E.) (Ans.: 51-7 kW)

International Edition---engineering Mechanics: Statics, 4th Edition

4th Edition

ISBN:9781305501607

Author:Andrew Pytel And Jaan Kiusalaas

Publisher:Andrew Pytel And Jaan Kiusalaas

Chapter7: Dry Friction

Section: Chapter Questions

Problem 7.76P: The clutch described in Prob. 7.75 is to transmit a torque of 120lbft when the total spring force...

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