Speed reducer is a dynamic communication agency, used gear speed converters, motor (motor) Rotary gear to the number you want, and the bodies of larger torque. Currently used to transmit power and movement of body, reducers apply a wide range of. Almost in all kinds of mechanical of drive system in the are can see it of trail, from transport of ship, and car, and locomotive, building with of heavy machines, mechanical industrial by with of processing machines and the automation production equipment, to daily in the common of appliances, watches and so on. its application from big power of transmission work, to small load, precise of angle transmission are can see deceleration machine of application, and in industrial application Shang, deceleration machine has deceleration and the increased turned moment function. So widely in speed and torque converter.