Planetary gear reducer has the characteristics of small size，light，high bearing capacity，long use life，smooth operation，low noisy，high output torque，various ratio，high efficiency and so on. It is a new reducer with comprehensive versatility, it can be widely used on robot、instruments and apparatus、food processing、packing machine、engineering machinery、metallurgy、petrochemical engineering、construction machinery、light and textile industry、medical apparatus and instruments、auto、ship、 ordnance industry and aerospace industry and other industry.