A speed reducer has 20 deg full depth teeth, and the single reduction spur gear

Question

A speed reducer has 20 deg full depth teeth, and the single reduction spur gear gearset has 22 and 60 teeth. The diametrical pitch is 4 teeth/in and the face width is 3 1/2 in. The pinion shaft speed is 1145 rev/min ............
Why in the solition Sf = Sh and why is it equal to 1?
14-24 A speed reducer has 200 full-depth teeth, and the single-reduction spur-gear gearset has 22 and 60 teeth. The diametral pitch is 4 teeth/in and the face width is 3 in. The pinion shaft speed is 1145 rev/min. The life goal of 5-year 24-hour-per-day service is about 30109) pinion revolutions. The absolute value of the pitch variation is such that the transmission accuracy level number is 6. The materials are 4340 through-hardened grade 1 steels, heat-treated to 250 Brinell, core and case, both gears. The load is moderate shock and the power is smooth. For a reliability of 0.99, rate the speed reducer for power.

Explanation / Answer

safety factor SFguarding against bending fatigue failure and

safety factor SH guarding against pitting failure.

As in the problem statements its mentioned as For a reliability of 0.99, Sf and Sh taken is equal to 1

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