Experimental split ring/harmonic planetary drive by ErikRudec

Last crawled date: 3 years ago

This is an experimental split ring/harmonic planetary gearbox; Sun gear is the input, output is the top ring which has 2 more teeth than the ring below - each revolution of the carrier (planets) will move the outer ring by 1 tooth.
This is still experimental as i can't find or access suitable documentation on this type of gearing reduction.
Keep in mind that i didn't include the planet carrier because i'm still working on exact gear spacing, which isn't as trivial as it sounds because of 2 different modules i used to align ring diameters.
Some technical data:
Bottom(fixed) ring teeth: 56
Top(output) ring teeth: 58
Sun teeth: 24
Planet teeth: 16
Bottom ring module: 1.5mm
Top ring module: 1.45mm
Planet module: 1.45mm
Sun module: 1.5mm
I will be updating this project with real pictures soon, and if this turns out successful i'll be completing the design and sharing it.
NOTE: Designed to be mounted on NEMA23 standard motor
UPDATE: Added a video of the prototype in operation.
Experiment turned out to be a success, althought i had to print in PLA, which doesn't have the properties i'd like in a gear system. Tolerances turned out to be tight, and i had very little manual sanding and finishing.
Video shows a slightly modified output ring as i didn't need to enclose it fully to test it.
System functions with no visible or otherwise noticeable backlash, and works as intended.
Therefore i conclude this experiment as finished, and will be working on enclosing and releasing a fully functional and ready-to-print gearbox.
https://www.youtube.com/watch?v=7yRP8Xe_WHM