Cycloid reducer is an application planetary transmission principle, the adoption of new gear cycloid tooth meshing. Full cycloid gearing can be divided into three parts: input part, slow down some of the output section. The input shaft is provided with a dislocation of 180 ° double eccentric, the eccentric sleeve is equipped with two roller bearings called boom, forming H institutions, the central hole of two cycloidal boom is eccentric sleeve bearing raceway, cycloid pin gear wheel and on a set of circumferentially arranged by needle teeth meshed to constitute a tooth difference of one tooth in the meshing of reduction mechanism, (in order to reduce friction, the ratio of the small gear with the needle teeth needle teeth sets).