Reducer is a kind of transmission, generally used for low-speed high-torque transmission equipment, the principle is to motor, internal combustion engine, motor or other high-speed operation of the power, through the reducer input shaft teeth less gear meshing output shaft Large gear, so as to achieve the purpose of deceleration; size gear ratio of teeth, that is, transmission ratio. The reducer is a kind of independent component which is composed of a gear drive, a worm drive and a gear-worm drive enclosed in a rigid shell. It is often used as a deceleration transmission between the original and the working machine. In the prime mover and the working machine or between the implementation of the matching speed and transmission torque from the role of modern machinery is widely used. Reducer in accordance with the different transmission stages can be divided into single-stage and multi-stage reducer wheel shape can be divided into cylindrical gear reducer, bevel gear reducer and cone-cylindrical gear reducer; in accordance with the transmission arrangement can be divided For the expansion, split and the same into the shaft reducer.