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How can I merge two input into one? (gear mechanism) There are a tube, a shaft, and a gear. The shaft is in the tube and both of them rotates in same direction. And I have to deliver the power to the gear at the bottom. How can I merge two input and deliver it to one gear without interrupting one's rotation? There would be no reverse rotation of gear.

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One way you could do that (it might require significant rework) is with the use of a differential /planetary gear system.

The planetary gear arrangement with the sun-planets-ring might lend itself more to the endeavour

enter image description here

i.e. attach:

  • the red shaft to the sun
  • the outer (blue) tube to the ring
  • the gear to the planet carrier.

There are a lot of asterisks, i.e. what is the rpm on the output compared to the rpm of the shaft and the ring, however, since you did any information I assumed that you wanted to transfer power/torque.

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you can use a mechanism like a car differential, connecting the tube and shaft to the sides but in a reverse sense. And the output is where it is in a car is the engine shaft.diff

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