Polyon Hard-Tooth-Faced speed reducer 1. Optimizing design is made on the gears for hard-tooth-faced speed reducers in the national standard,and the actual bearing capability of some speed reducers is improved. 2.The box-type design has broken through the thinking model in which the hard-tooth-faced speed reducers are led by curves in the national standard ,and has introduced a shape of polygon led by straight lines. 3.The polygon boxes can be mounted in any way and are adaptive widely. 4.Small volume,light weight,low noise,high efficiency and long service life. Foot, hollow shaft, solid shaft and shrinkage disk connections Can handle with backstop in order to rotate in single direction Coupled with high power engines, achieve high capacity Parallel-shaft series Range of ratio: 1-step:1.25-5.6 2 step: 8-14 3 step: 16-50 4 step: 56-355 9 assembling types Orthogonal-shaft series: 2-step:8-14 3-step: 16-50 4-step 56-355 4-7 assembling types