Published on February 4, 2018
i = nc/n4 = 1/(1+ ((Z1.Z3)/(Z2.Z4)))
nc: velocity of the green crank.
n4: velocity of the blue internal gear, its tooth number: Z4 = 70.
Z2 = 30 (yellow gear); Z3 = 20 (pink gear); Z1 = 20 (fixed orange gear)
Z1 + Z2 = Z4 — Z3
i = 21/25
The crank, the blue internal gear always rotate in the same direction independently of the tooth numbers.
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