A horizontal belt conveyor arranged as shown in Fig. operates at a speed of 1.27 m/s and requires 15.7 kW at the 760 mm-diameter driving drum. The drum receives power from a countershaft through a pair of spur gears. A motor operating at 850 rpm delivers power to the countershaft through a roller chain. The mechanical efficiency of the chain drive is 94 percent and of the gears is 96 percent. (a) Determine the power of the motor you would recommend. (b) Calculate the number of teeth on the large sprocket required to run the conveyor belt at the speed specified. (c) Determine the torque in N-m on the countershaft corresponding to the rated power of the motor. (d) Assuming an allowable stress in shear equal to Ssy = 38 MPa, determine the diameter of countershaft you would recommend, use DE- Goodman theory. assume Su and Se (e) select a flat belt (f) In a commercial drive, a brake is placed at shaft AB so that the conveyer may be stopped, or to prevent its running backward in the event of power failure, What factors determine the location of the brake, that is, on motor shaft, on shaft AB, or on the belt drum shaft D? Gear module is 6.35 mm Motor 24T 18T 125 1060 A B 125 Chain, 25.4 pitch Brake drum 124T Countershaft Large sprocket7 Drum 1.27 m/s Conveyor belt

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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.