Question

Answer given is 325 rpm

O2 P2 Figure 4.12 shows the arrangement of part of a pre- selective compound gearbox. Input shaft I is rotating at 700 rpm while gear N is rotating at 600 rpm. The number of teeth are as follow : Ai(internal)=75; Al(external)=90 ; Si=25 ; Sz=35; Az=105 and N=30. With this condition, calculate the velocity of shaft 01, gear Ai and Az if the overall efficiency is 90%. [325 rpm] Si S2 Figure 4.12

Answer 1

N Ny = too Nu= 6oo A LAN IP A, (Int) = 75 A,(Ext.) = 90 S, = 25 S2=35 o I A2 =los N=30 A-90 NN=600 NA =200 W=30 Ns, Ne =-TP -200 Tsz Ne2 Duo -200 0 - 200 0 NA Tapi TO PL from @ @ Ns, -200 -3 35 NA2-200 3 (NA -20) N 239) Ns, No Np No Te 25 Np - No N. 75 'AL -No Te

from @ eo Ns, - No, NA -No, -3 Ns, - No, 200 - No Ns, - No, e-3 (200 -No,) 6 from ③ Ns, = Ns = N₂ = 700 given) (Too - 200) = 3(NA, -2:00) +200 - NA2 500 -3 500 - 600 - 3 10o 3 NAZ loo 3 from 6 700 No No, -3/200 - No ) =-600 + 3 No, 1300 = 40o, No, = 325 RPM Ang i NA = 200 RPM No, = 325 RPM NAZ lesz = 33.33 RPM