Published on February 3, 2018
i = n1/nc = 1 — ((Z2.Z4)/(Z1.Z3))
n1: velocity of the yellow gear, its tooth number Z1 = 44
nc: velocity of the blue crank.
Z2 = 44 (green internal gear); Z3 = 40 (orange internal gear); Z4 = 20 (fixed pink gear). The green gear and the orange one are fixed together.
Z2 — Z1 = Z3 — Z4
i = 1/12
The crank, the yellow gear rotate the same direction for this case.
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