To make a transition gear in the middle, it is necessary to realize the gear rotation, the shaft does not turn, how to use deep groove ball bearings? Axle diameter 8mm, gear indexing circle diameter about 30mm, thickness about 10mm. The key is that the gear sleeve is on the outer ring of the bearing. How to fix the gear in the axial direction? Use common materials, simple methods. Flange bearings can be used. I don't have much experience. I hope the experienced master will preach. Thank you.
A thrust bearing is added at each end of the gear, and one end of the thrust bearing is axially fixed, and the other end of the bearing is contacted with the gear wheel hub to ensure that the rotation of the gear is not impeded, and the axial direction can not move. (gear wheel hub is wider than bearing width, 2mm width at each side of assembly, easy to locate).
Thus, the shaft does not rotate, but the driven gear will rotate and the movement will not pass to the shaft. If you do not consider other problems, the gear can be fixed axially:
The gear sleeve is sheathed on the outer ring of the bearing, namely, the outer ring of the bearing rotates with the gear. In this way, the inner ring of the bearing is sheathed on the shaft, and both ends of the shaft are fixed on the frame
