Kinematics of the Planetary Gearset (Epicyclic gearing)

In an epicyclic gear train shown in Fig 15.46, the arm A is fixed to shaft S. The wheel B, having 90 teeth, rotates freely on shaft S, and wheel F with 135 teeth is separately driven. If arm A runs at 240 rpm clockwise and wheel F at 120 rpm in the same direction, find (a) the number of teeth on wheel C, and (b) the speed of wheel B.Fig. 15.46: Epicyclic gear train[Ans. 23, 421.3 rpm]

How does the epicyclic gear work? - TimesMojo

Basics of wave and cycloidal gearing for robotics and servo designs

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