Ring Gear and Pinion

This is a basic ring gear with 54 teeth, set at 1/8" spacing. I made the hub to fit a standard 1/4" shaft on the ring gear. The pinion gear has a 1/8" shaft hole and 10 teeth.

I did not include any shaft lock recess, such as a key slot or flat or set screw holes in order to let you design your own into it. For precision, I usually bore out my shaft holes and either machine from aluminum or 3D print a new custom shaft hub designed to fit my motor output shaft and just glue or screw it into the gear model. So, the axel holes are more or less just centering holes, although they will accept standard shaft sizes as is.

My purpose for this gear arrangement is to move the bulk of the motor drive above the large wheel axel. This gear set was originally designed in order to move the wheel motor above the drive wheel axel for ground clearance. This was for a heavy duty rock crawler/ATV rover I built.

There is a disadvantage, however; dirt and debris can collect inside the gear and ca