Introduction to planetary wheel system structure
A planetary gear is a gear system that, in addition to being able to rotate around its own axis like a fixed shaft gear, also rotates along the axis of the planetary rack around other gears.
The rotation around one's own axis is called "rotation", and the rotation around the axis of other gears is called "revolution", just like the planets in the solar system, hence the name.

Structural features:
At the center of the rotation is the sun wheel; The planetary wheels revolve around the sun and rotate at the same time. The planetary gear and the adjacent solar wheel and gear ring are always in constant meshing state; The compact structure, with the sun wheel, planetary rack and gear ring all concentric, allows the elimination of intermediate shaft and intermediate gear; Helical gears are usually used to improve the smoothness of work; Planetary gears generally have 3/4 gears, and the more the number, the stronger the carrying capacity.

Drive combination

In a gear system containing planetary gears, the transmission principle is different from that of fixed shaft gears.

Because of the planetary rack, there are three rotating shafts that allow power input/output, and one of these shafts can be limited by means of a clutch or brake if needed, leaving only two shafts for transmission.

Thus, the relationships between meshing gears can be in a variety of combinations:

(1) the power is input from the sun wheel and output from the outer gear ring, and the planetary frame is locked through the mechanism;

(2) the power is input from the solar wheel and output from the planetary frame, and the outer gear ring is locked;

(3) power input from the planetary frame, output from the sun wheel, locked outer gear ring;

(4) the power is input from the planetary frame and output from the outer gear ring, and the solar wheel is locked;

(5) power input from the outer gear ring, output from the planetary frame, locked solar wheel;

(6) power input from the outer gear ring, output from the sun wheel, planetary frame locked;

(7) the two power sources are input from the sun wheel and outer gear ring respectively, and output from the planetary frame after synthesis;

(8) the two power sources are input from the planetary frame and solar wheel respectively, and output from the outer gear ring after synthesis;

(9) the two power sources are input from the planetary frame and outer gear ring respectively, and output from the solar wheel after synthesis;

(10) power is input from the sun wheel and output from the outer gear ring and the planetary frame in two ways;

(11) power is input from the planetary frame and output from the sun wheel and outer gear ring in two ways;

(12) the power outer gear ring input is output from the solar wheel and the planetary frame in two ways.