Published on February 4, 2018
i = n1/nc = 1 — ((Z2.Z4)/(Z1.Z3))
n1: velocity of the green internal gear, its tooth number Z1 = 44
nc: velocity of the blue crank.
Z2 = 24 (yellow gear); Z3 = 20 (pink gear); Z4 = 40 (fixed orange internal gear). The yellow gear and the pink one are fixed together.
Z1 – Z2 = Z4 — Z3
i = -1/11
The crank, the green gear rotate in opposite directions for this case.
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