The round grinding wheel enveloping(ZC1)cylinder worm is applied in this shaft round cylinder worm decelerator. The tooth of worm gear and worm are conjugated. It is wide applied ranges from 0.59-75.84kw, the output torque locates between 180-7077N. M. The input rotating speed is no more than 1500r/m. The ambient temperature is -40 to +40, the lubricating oil must be heated up to 0, if the temperature is below 0.