Planetary Gear Train

number of teeth:

ring gear

18

planet gear

5

Sun gear: 8

lock

ring gear

Sun gear

planet carrier

animation

This Demonstration simulates a planetary gear train with cycloidal gears. A typical planetary gear train has three components: the ring gear, the Sun gear, and the planet carrier connecting the two together.

You can see a wide range of reductions by holding stationary any one of these components and using the remaining ones as inputs and outputs.