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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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  • $\begingroup$ I'm going to point out that this could work if the far side axle was thinner and made to run through the near side axle, and if the near side axel is hollow. The drive shaft output can be removed entirely, and it could be made inline if the "cup" part of the differential could be mirrored to the other side and an axle welded on. Feel free to tell me, reader, if this comment was inappropriate and I'll delete it if necessary. $\endgroup$
    – Harry Mu
    Commented Oct 22 at 22:08

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