• Design a pinion and gear to transmit 25 HP with a pinion speed of 2000 RPM and a gear speed of 500 RPM. The gear ratio is 4:1. Design for strength and pitting resistance to achieve approximately 20,000 hours of life with a reliability of at least 99.9%
• For the pinion and gear, provide the following data in one table. Use proper units.
  • Diametral Pitch
  • Number of teeth on pinion
  • Number of teeth on gear
  • Diameter of pinion [in]
  • Diameter of gear [in]
  • Center distance [in]
  • Face width [in]
  • Tangential force [lbf]
  • Required bending stress number for pinion [psi]
  • Required contact stress number for pinion [psi]
  • Material of construction

A table is not needed, I will fill that out. I only need help with the 7 that are in bold.

Please show all work.

Here is what I have so far:

Diametral pitch, Pd = 8

Number of teeth on pinion = 20

Number of teeth on gear = 80

Overload factor, Co = 1.5

Elastic coefficient = 2300

Quality number = A9

Geometry factor, J = 0.43

Pitting factor, I = 0.115

Tangential force = 630.56 lb