The fourth level planetary gear reducer includes a body, and the product body includes an input shaft. The input shaft of the product is connected to the first planetary gear carrier through an isolation gasket, and the first planetary gear carrier of the product is connected to the second planetary gear carrier through a bearing. The second planetary gear carrier of the product is connected to the third planetary gear carrier through a bearing, and the third planetary gear carrier of the product is connected to the fourth planetary gear carrier through a bearing, The fourth planetary gear carrier of the product is movably connected to one end of the output shaft, and the other end of the output shaft of the product is fixedly connected to the output rod through the output end cover. The four stage planetary gear reducer is equipped with a first planetary gear carrier, a second planetary gear carrier, a third planetary gear carrier, and a fourth planetary gear carrier. The setting of the four stages reduces rotational speed, increases torque, and reduces the inertia ratio of the servo motor, resulting in better deceleration effect and higher accuracy, making it convenient for people to use.

The secondary planetary gear reducer includes a primary planetary support, a primary planetary gear installed on the primary planetary support, a secondary planetary support, and a secondary planetary gear installed on the secondary planetary support. The primary planetary gear is internally meshed with the primary gear ring, and the middle of the primary gear ring is equipped with a primary transmission gear. The primary transmission gear passes through the secondary planetary support and is externally meshed with the secondary planetary gear; The secondary planetary gear is internally meshed with the secondary gear ring, and the middle of the secondary gear ring is synchronously connected to an output shaft; The first and second stage planetary supports have mounting flanges, which are respectively equipped with buckles and protrusions. The first stage planetary support is fixedly connected to the second stage planetary support. By setting the two planetary brackets in a form with mounting flanges and clamping, the installation process is simplified. The two-stage planetary gear reducer with this structure has a clever structure, convenient assembly, and easy disassembly and maintenance.