A pair of identical straight bavel gears of 30 tooth and 6 in of pitch dia, 1.2 inch face width, 20° normal pressure angle, the gears are graded steel through hardened with a core and case hardness of 180 BHN, quality number of 6, uncrowned for general purpose use. For 10710^7107 cycle life at 600 rpm and 99% reliability, Find the power rating based on AGMA Bending strength.
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 900 rev/min and the normal pressure angle is 20°. The pinion is mounted outboard of its bearings; the bearing of the gear straddles it. What is the power rating based on AGMA bending strength? (For cast iron gear sets, reliability information has not been developed yet. We say life is greater than 10710^7107 revolutions; set KtK_tKt = 1, CLC_LCL = 1, CRC_RCR = 1, KRK_RKR = 1; and apply a factor of safety. Use, SFS_FSF = 2 and SHS_HSH = 2\sqrt{2}2)
A catalog of stock bevel gears lists a power rating of 5.2 hp at 1200 rev/min pinion speed for a straight-bevel gearset consisting of a 20-teeth pinion driving a 40-teeth gear. This gear pair has a 20∘20^{\circ}20∘ normal pressure angle, a face width of 0.71 in, and a diametral pitch of 10 teeth/in and is through-hardened to 300 BHN. Assume the gears are for general industrial use, are generated to a transmission accuracy number of 5, and are uncrowned. The gears are rated for a life of 3×1063 \times 10^63×106 revolutions with a 99 percent reliability. Given your opinion on the stated catalog power rating.
An uncrowned straight – bevel pinion has 22 teeth, a module of 4 mm and a transmission accuracy number of 5. The pinion and the gear are made of through -hardened steel, both having core and case hardness of 180 Brinell. The pinion drives the 24 tooth bevel gear. The shaft angle is 90∘90^{\circ}90∘, the pinion speed is 1800 rev/min, the face width is 25 mm, and the normal pressure angle is 20∘20^{\circ}20∘. Both gears have an outboard mounting. Find the power rating based on AGMA pitting resistance if the life goal is 10910^9109 revolutions of the pinion at 0.999 reliability.