- A Gearbox Is Needed To Provide An Exact 42 1 Increase In Speed While Minimizing The Overall Gearbox Size The Input And 1 (301.16 KiB) Viewed 33 times
a b AND c SECTIONS
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A gearbox is needed to provide an exact 42:1 increase in speed, while minimizing the overall gearbox size. The input and output shafts should be in-line. Specify appropriate teeth numbers. Input shaft transmits the power of 30 hp and rotates at 3000 rpm for air moving at 500 ft/min at 70 F with a = 1. The lubricant is SAE grade 20 oil. All gears are spur gears with 20° pressure angle. Gears have diametral pitch as 5 teeth/in. Teeths : N4 = 21 N5=147 N2 =24 N3 = 144 Calculate the diameter of shaft b with respect to a. stress consideration. Shaft is steel having 36.5 ksi yield strength. For shaft design factor of safety is 1.5. b. Deflection consideration; slope under gear 3 on shaft b must be 0.005 radian. E=30x10 psi. C. Critical speed consideration; find factor of safety.
6 in 4 input shaft a 5 3 shaft b 10 in 24 in 3 in