An electric motor is"driving" a machine in a textile factory with a "flat belt". The motor is delivering 1.25 hp at 1725 rpm to the machine and the coefficient of friction between the belt and the 3.5 in diameter steel pulley attached to the motor shaft is μ = 0.25. If the tension in the "tight side" of the flat belt is 54 lb, what is the minimum "angle of wrap" needed to prevent the flat belt from slipping on the motor pulley? Ans. 151.3°
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- The single-plate clutch transmits the torque C from the input shaft on the left to the output shaft on the right. Compression springs between the clutch housing and the pressure plate provide the necessary pressure on the friction surface. The splines prevent the clutch plate from rotating relative to the output shaft. If Ri=4 in. and R0=9 in., determine the total force that must be applied to the pressure plate by the springs if the clutch is to transmit a torque of C=56lbft when it is new.Calculate the horizontal force P required to push the 85-lb lawn mower at constant speed. The center of gravity of the mower is at G, and the coefficients of rolling resistance are 0.12 for the front wheels and 0.18 for the rear wheels.The cone clutch transmits the torque C through a conical friction surface with cone angle . The inner and outer radii of the friction surface are a and b, respectively. The left half of the clutch is keyed to the shaft, and the right half drives a machine (not shown) through a gear attached to its outer rim. Assuming uniform pressure on the friction surface, show that the maximum torque that can be transmitted by the clutch is
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