Sunless Compound Planetary Gear Set
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Visualization of sunless compound planetary gear set.
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Planetary gear set has a sun but this gear set is without a sun. Also, it has double plannet(s). One ring is fixed while the other is the output. Motor rotates the planet(s) around the common center of the rings. There could be a single planet (like in cycloidal gear) or more planets (like in planetary gear).
Advantages
- High gear ratio
- Less parts
- More ratios possible
- High torque
- Does not need special components (like in cycloidal gear)
- Bi-directional (you can swap input/output)
Disadvantages
- Axial output configuration suffers from torsion
- Torsion avoidance configuration has side output only or requires counter balast
Gear ratio
1 : dr2 / (dr2 - dr1 * ds2 / ds1)
ds1 .. diameter (number of teeth) of the 1st spur gear
dr1 .. diameter of the 1st/fixed ring
ds2 .. diameter of the 2nd spur gear
dr2 .. diameter of the 2nd/output ring
Negative number represents counter-rotation.
There's a Python script to find proper gearing for the specified gear ratio.
Examples
- Prusa Nextruder (1:20): 5, 6, 7, 8
- LDO Sherpa Mini Extruder (1:5): 4, 6, 8, 10
- hours (1:12): 6, 7, 13, 14