MP-43 · GEARS
Planetary Gear Train Ratio
Calculate a simple planetary reduction ratio for a fixed ring, sun input, and carrier output from sun and ring tooth counts.
Preliminary design support. Your inputs and results stay in this browser.
WHAT THIS SCREEN ANSWERS
Planetary gear trains can create compact reduction while sharing torque among planets, but the starting decision is kinematic. The fixed-ring, sun-input relationship uses entered sun and ring tooth counts to show ratio and carrier speed. This screen is intended to clarify the next engineering question.
Planet phasing, tooth geometry, load sharing, bearings, backlash, torque capacity, and packaging remain separate design questions. Confirm the exact arrangement, tooth counts, torque rating, efficiency, backlash, and supplier information. The simplified relation does not resolve it.
Planetary gear trains can create compact reduction while sharing torque among planets, but the starting decision is kinematic. Planet phasing, tooth geometry, load sharing, bearings, backlash, torque capacity, and packaging remain separate design questions. Do not let a convenient default become an undocumented design requirement.
The fixed-ring, sun-input relationship uses entered sun and ring tooth counts to show ratio and carrier speed. Confirm the exact arrangement, tooth counts, torque rating, efficiency, backlash, and supplier information. The decision remains specific to this application because planetary gear trains can create compact reduction while sharing torque among planets, but the starting decision is kinematic. Keep this output with the drawing or concept it informed.