Concept explainers
For the gearset and conditions of Prob. 15-3, find the power rating based on AGMA surface durability.
15-3 An uncrowned straight-bevel pinion has 30 teeth, a diametral pitch of 6, and a transmission accuracy number of 6. The driven gear has 60 teeth. Both are made of No. 30 cast iron. The shaft angle is 90°. The face width is 1.25 in, the pinion speed is 900 rev/min, and the normal pressure angle is 20°. The pinion is mounted outboard of its bearings and the bearings of the gear straddle it. What is the power rating based on AGMA bending strength? Note: For cast iron gearsets reliability information has not yet been developed. We say that if the life is greater than 107 revolutions, then set KL = 1, CL = 1, CR = 1, KR = 1, and apply a factor of safety. Use SF = 2 and SH =
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SHIGLEY'S MECHANICAL ENG.DESIGN W/CODE
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