Planetary Gears

Planetary gear, Epicyclic Gearing is a gear structure, usually one or more external gears revolve around a central gear, just like planets revolve around the sun, hence the name.

Description

Planetary Gears Are Also Called Planetary Gearboxes and Planetary Gear Transmissions.

Planetary gear, Epicyclic Gearing is a gear structure, usually one or more external gears revolve around a central gear, just like planets revolve around the sun, hence the name. In addition, the planetary gear usually has an outer ring gear on the outermost side, which is used to fit the trajectory of the planetary gear.

Planetary gears can generally be divided into simple planetary gears and complex planetary gears. Simple planetary gears are sun gear, outer ring gear, planet gears, and planet carrier. A complex planetary gear generally refers to a gear train that includes both a planetary gear train and a sun gear train.

Compared with simple planetary gears, complex planetary gears have the characteristics of a high reduction ratio and high torque.
Generally, the axes are parallel to each other, but there are some planetary gears, such as pencil sharpeners, where the gear axes are at an angle and use multiple spiral bevel gears.

Advantage

The advantages of planetary gears are large load capacity, small size, pure transmission torque, and stable operation. Additionally, multiple planetary gears can interact.

Since the planetary gear is pure torque transmission, it has excellent transmission efficiency. The efficiency loss between stages of gear transmission is only 3%. Based on such a high transmission efficiency, the planetary gear can guarantee a very high power output/input ratio.

Since the power distributed to each external gear in the planetary gear is equal, the power output of the planetary gear is very stable, and it is also commonly used in the gearboxes of various large machinery and vehicles.