You need to design a pulley and belt system that can handle

You need to design a pulley and belt system that can handle an 80 lb.-in. load at 300 rpm at the output shaft. The driver gear has 14 teeth and the driven gear (output) has 28 teeth and the belt series is “heavy”. Find the belt width that minimizes overdesign and appropriate shaft diameters (both shafts) to handle the load with a factor of safety of 2.

For the shaft: Sy=66,000 psi, Sut=78,000 psi

k values for endurance strength:

ka=0.78

Assume a diameter for the kb then double check that it is correct. If a wrong value of kb was assumed, mention it but you don’t need to repeat the calculation.

The belt tension (not including torque) is 5 lbs.

The attached sheet has an equation to find the angle of the belt created when two pulleys are different size.

You may need to MC-Master to find parameters.

Figure ll IS Belt geometry. op lew e View N 30G rpm D-d D-d

Solution

The answer of the following question is as follows .

Thedesign of the belt and pulley as per the standard criteria or data book is D = 45 cm , N = 479 rpm , tension = 76