n1i 20 "Number of teeth, first gear (counter shaft)"
n2i 20 "Number of teeth, second gear (counter shaft)"
n3i 20 "Number of teeth, third gear (counter shaft)"
n4i 20 "Number of teeth, fourth gear (counter shaft)"
n5i 28 "Number of teeth, fifth gear (counter shaft)"
n1o 76 "Number of teeth, first gear (main shaft)"
n2o 44 "Number of teeth, second gear (main shaft)"
n3o 28 "Number of teeth, third gear (main shaft)"
n4o 20 "Number of teeth, fourth gear (main shaft)"
n5o 20 "Number of teeth, fifth gear (main shaft)"
gear_ratio1 n1o/n1i "Gear ratio, first gear"
gear_ratio2 n2o/n2i "Gear ratio, second gear"
gear_ratio3 n3o/n3i "Gear ratio, third gear"
gear_ratio4 n4o/n4i "Gear ratio, fourth gear"
gear_ratio5 n5o/n5i "Gear ratio, fifth gear"
cd 100[mm] "Center distance"
d1i 2*cd/(1+gear_ratio1) "Pitch diameter, first gear (counter shaft)"
d1o 2*cd-d1i "Pitch diameter, first gear (main shaft)"
d2i 2*cd/(1+gear_ratio2) "Pitch diameter, second gear (counter shaft)"
d2o 2*cd-d2i "Pitch diameter, second gear (main shaft)"
d3i 2*cd/(1+gear_ratio3) "Pitch diameter, third gear (counter shaft)"
d3o 2*cd-d3i "Pitch diameter, third gear (main shaft)"
d4i 2*cd/(1+gear_ratio4) "Pitch diameter, fourth gear (counter shaft)"
d4o 2*cd-d4i "Pitch diameter, fourth gear (main shaft)"
d5i 2*cd/(1+gear_ratio5) "Pitch diameter, fifth gear (counter shaft)"
d5o 2*cd-d5i "Pitch diameter, fifth gear (main shaft)"
alpha 25[deg] "Pressure angle"
beta 30[deg] "Helix angle"
omega 2*pi[rad]*800[rpm] "Engine or main shaft speed"
T 2*pi/omega "Time period of main shaft rotation"
T_ext 1e3[N*m] "Output torque"
kt 1e8[N/m] "Gear mesh stiffness"
R 0.75 "Sphere radius"
n 5 "Engaged gear"