Planetary hub reductions
Thursday 4 August 2011, by
When i saw Zblj’s planetary hub reductions on his TATRA i decided to make my own.
holding the grey part of turntable stationary, planet carrier as output directly connected to wheel and "sun" 8 tooth gear as input gearing ratio can be calculated from 1/(1+Na/Ns)= 1/(1+24/8)=1/4=0.25
so one rotation of the input rotates 1/4 on the output
[Na=24 (number of teeth in the stationary - grey part of turntable), Ns=8 (number of teeth of input "sun" gear)]
My design uses only 2 8 tooth gear in the carrier instead of Zblj’s 4 but it’s enough to prevent slipping gears (tire will slip on the rim).