Input: the red gear receiving rotation from the brown motor.
Output: the yellow rim to which a closed circular chain is attached. This chain plays acts as the internal teeth of the yellow rim.
Four blocks (each with three rollers) form a revolution joint between the rim and the gray base.
This design could be applied to an astronomical observatory:
https://vimeo.com/296041003?fl=pl&fe=cm
Inventor files of this video:
https://www.mediafire.com/file/t96yks2reoryx3u/InternalChainGearDriveInv.zip/file
