Planetary Gears

In a simple planetary gear mechanism. We locate the sun gear at the center of the planetary gear mechanism. The sun and planet gear often mesh, and the two external gears mesh in opposite rotation directions.

Just as the sun is at the center of the solar system, we name the sun wheel for its position. In addition to being able to rotate around the support axis of the planet carrier. The planet gear will also revolve around the central axis of the sun gear under the circumstances of the planet carrier, just like the rotation of the earth and the revolution around the sun. When this happens, it is called a planetary gear mechanism.

For example, in the entire planetary gear mechanism, the rotation of the planet gear exists, and it fix the planet carrier. This method is similar to a parallel shaft transmission called a fixed shaft transmission. The ring gear is an internal gear. It often meshes with the planetary gear—the internal and external gear mesh with the same rotation direction. The quantity of planetary gears depends on the design load of the transmission, and usually, there are three or four; the more the amount, the greater the burden.
People usually call the simple planetary gear mechanism as a three-component mechanism, which refers to the sun gear, planet carrier, and ring gear. Suppose these three components determine the relationship between each other. In that case, generally, people fix one of the components needs first. Then decide who is the active part and select the rotating speed and rotation direction of the active region. Finally, the rotating speed and direction of the passive role are determined.