Machine Design I

A commercial enclosed gear drive consists of a 20° spur pinion having 16 teeth driving a 48 tooth gear. The pinion speed is 300 rev/min, the face width 50 mm, and the module 4 mm. The gears are grade 1 steel, through hardened at 200 Brinell, made to No. 6 quality standards, uncrowned, and are to be accurately and rigidly mounted. Assume a pinion life of (10^8) cycles and a reliability of 0.95. Determine the AGMA bending stress and the corresponding bending factors of safety if 4 kW is to be transmitted.