How Do You Calculate Planetary Gear Ratio?
Planetary gear systems are composed of three main parts. The ring gear is the outermost gear on the gearset. The sun gear is the center gear of the system and is encircled by the planetary gears. Planetary gears are able to function on one single axis instead of many. This makes calculating the gear ratio easier because you only have to count teeth in one specific section, whereas other gear ratios would require you to count multiple different gear units. It is important to note whether the gear is in overdrive or underdrive and the action of the carrier, as this will affect the process of calculating the gear ratio. Count the number of sun gear teeth and the number of ring gear teeth if the planetary gear is set in underdrive with the carrier as the output. Add the two numbers together. Divide the resulting number by the number of teeth on the driving member for the gear in underdrive when the carrier is the output. The total is the gear ratio for that gear setting. Divide the number
