The entire transmission device of the planetary cycloid pinwheel reducer can be divided into three parts: input part, reduction part, and output part. A double eccentric sleeve with a 180° offset is installed on the input shaft, and two roller bearings called swing arms are installed on the eccentric sleeve to form an H mechanism. The center holes of the two cycloid wheels are the raceways of the swing arm bearings on the eccentric sleeves, and the cycloid wheels are meshed with a group of circularly arranged pin teeth on the pin gear to form an internal meshing reduction mechanism with a tooth difference of one tooth (in order to reduce friction, in a reducer with a small speed ratio, the pin teeth are provided with a pin gear sleeve). When the input shaft rotates one circle with the eccentric sleeve, due to the characteristics of the tooth profile curve on the cycloid wheel and its restriction by the pin teeth on the pin gear, the movement of the cycloid wheel becomes a planar motion with both revolution and rotation. When the input shaft rotates forward, the eccentric sleeve also rotates one circle, and the cycloid wheel rotates one tooth in the opposite direction to obtain a reduction in speed. With the help of the W output mechanism, the low-speed rotation of the cycloid wheel is transmitted to the output shaft through the pin shaft, thereby obtaining a lower output speed.
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