R series helical gear hard-tooth surface reducer has the characteristics of small size and large transmission torque; it is designed and manufactured on the basis of modular combination system, and there are a lot of motor combinations, installation forms and structural schemes, and the transmission ratio is finely graded to meet different applications. Working conditions, to achieve mechanical and electrical integration; high transmission efficiency, low energy consumption, superior performance; the box body adopts high rigidity cast iron box body with ribs; the hard tooth surface gear adopts high-quality alloy steel; the surface is carburized and quenched and hardened. The teeth are finely processed, smooth transmission, low noise, large carrying capacity, low temperature rise and long life.