Planetary gear shafts can indeed achieve efficient power transmission in relatively small spaces, which is one of the important reasons why planetary gear systems are widely used in high-power density applications. Its core advantage lies in its compact structure, high transmission ratio, and high torque carrying capacity.

In a planetary gear system, multiple planetary gears rotate around a central sun gear and mesh with both the ring gear and the sun gear simultaneously. This coaxial layout concentrates multiple transmission paths in a compact cylindrical space, greatly saving installation space. Compared to traditional parallel axis or helical gear systems, planetary gear systems can transmit greater torque under the same volume conditions, thus having higher power density.

As an important component connecting the planetary gear and the planetary carrier, the planetary gear shaft must have high precision, rigidity, and strength to ensure efficient and stable power transmission during multi-point meshing operation in a compact space. Due to the fact that the load is shared by multiple planetary gears, the planetary gear shaft can achieve load distribution and transmission within a limited space, significantly reducing the load on a single component and improving the efficiency and lifespan of the entire system.

Due to the fact that the input shaft and output shaft can be arranged on the same axis during the planetary gear transmission process, additional intermediate transmission structures are avoided. This strong neutral advantage further saves equipment length and component quantity, which is beneficial for equipment lightweighting and modular design, thereby improving the integration and reliability of the overall mechanical system.