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Study of planetary nut-screw drive 1b

Input: yellow pulley.

Internal gear (35 teeth) is stationary. Pink nut is fixed to the pink gear (30 teeth). The nut (lead = t1) rotates in eccentric hole (in pink) of the yellow pulley. The nut can roll on the screw thus reduces the friction.

Output: green screw (lead = t2 = t1) moving linearly an amount of S in 1 revolution of the input.

S = t2+(Z2/Z1)*t1

If no grey internal gear, the output motion depends on the friction between the nut and the screw. If no friction the screw does not move.

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