The internal structure and working principle of the planetary gearbox

The planetary gearbox is also called the gearbox. Its structure is a mechanism in which multiple planetary gears rotate around a sun gear. It is also a mechanism that reduces the transmission speed ratio while increasing the torque of the motor proportionally.

Planetary gears can generally be divided into simple planetary gears and complex planetary gears. Simple planetary gears have a sun gear, an outer ring gear, a planet gear and a planet carrier. Complex planetary gears usually refer 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 high reduction ratio and high torque. Generally speaking, the shafts are parallel to each other, but there are also some planetary gears, such as a pencil sharpener, whose gear shafts are at a certain angle and use multiple spiral bevel gears.

Advantages: The advantages of planetary gears are large carrying capacity, small size, pure torque transmission, and stable operation. Moreover, multiple planetary gears can interact with each other. Disadvantages: The disadvantage of planetary gears is that their mechanical structure is relatively complex and requires certain manufacturing processes.

Another major disadvantage is that the efficiency of planetary gears decreases significantly as the transmission ratio increases, but this feature can be used for reduction gears.