I refer to the "Mechanical Worker" 1974 "6th Planetary Reduction Pulley", designed the planetary shifting pulley, the effect is good, the following is introduced: The planetary shifting pulley structure is shown in the figure. On the basis of the planetary reduction pulley, two sets of planetary gears 19 and 21 are added to the output end to mesh with the sun gears 20 and 23, respectively. Planetary gears use standard cylindrical gears. Fasten to the same planet axle with the key. 3 sun gears with displacement gears
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