Question

Your company needs a spur gearset for speed reduction from input of 3750 to output of 1500 rpm. The motion input comes from a single cylinder engine, with the peak torque of 234 lb-in. Your lab already has a 20 teeth, 4-in pitch diameter, 20o pressure angle gear that you wish to use as a pinion. Your lab assistant determined that , and Jg are 0.34 and 0.4, Kv 0.8, Km = 1.6, Ks -KB 1. For contact stress calculation, he found that I-0.1 Both pinion and gear will be through hardened steel. Your lab assistant already corrected the bending and contact strengths; these are 29167 psi and 93543 psi respectively Determine all the parameters for this gearset and the safety factors for bending and contact

Answer 1

wwwCHE 66 com SOLUTION Pack engine tor џе-234 ld-in. Phion20 Teth 4-n pitch diameterd 20 pressur angle 0.3408 (Dnomie Faor OMIC Rim-lhicknosc factor sige factor Material : .Hardened 14167 pstCovneced. Fd all parcsffactons for bendin and coroc Slly covrected barding shengt Sfcorted t sthen Sale COY ending stress (o

JT whee, w- tangetial ransmiel load, lbf nSmitte Koover bad faetor kv = dyramic factor k, = size fac or ransverse diame F fe wi of the narrower member, in rans verse me tbMn. Cp= elastic co a乐cient, Csurface canditian faetor di diam pinonh where, -Surtace georR

fati。 さY on, Pinlan 12. А Torque (b.in. ) x NP (n hp 234 x 375O 63025 На 13-92 hp 3926.99

shok pauar sour) and moderate shock (drisen machine k- .5o .P 9.532 |21 IO, 92 pst