Question

1. A commercial straight pinion has an 8 teeth / in. Diametric pitch, a 1.5 in. Face width, 16 teeth and a 20 pressure angle with full height teeth (calculating the Kx speed maker considering a milled profile). To be mated with a 50-tooth crown made of cast iron ASTM No. 50. With a tangential load of 382 lbf, estimate the safety factor of the transmission, based on the possibility of fatigue failure on the surface.

Answer 1

# commercial straight prerion. 8 teeth / Inch. Diametric pitch 1.5 in For 200 full depth Involute system y = 0.175 -0.84) 16 teeth fall width 200 y = 0.175 -0.841 50 full y = 0.15818 Now, lewis equation. Pressure angle height teeth so tooth crown made of CE from Astm No. so, we get Tangential load 382 Rbf EP - 30 MPsi vP = 0.292 EG = 14.5mps) VG = 0.211 Sc = 83.8ksi 383-8X103 psi y module teeth - 1 Diametic Pt mb Scy KV FOS 382 = 0.122X12X83.8 X 103 FOS Xo.15818 of 1.4 pitch FOS 382 X 1.9 0.122x1.2 483.8 x 103 X015818 teeth (m) = = 0.122 inch/ from Design data book, table we get value forku dynamic load factor FOS 0.374 10.3 KV - KN = 1.9 por Now, lewis form factor or tooth form factor.