Reducer in the prime mover and working machine or actuator between the matching speed and transfer of torque, reducer is a relatively precise machinery, the purpose of using it is to reduce the speed, Guo MAO reducer is divided into gear reducer, worm reducer and planetary gear reducer; According to the transmission series can be divided into single stage and multistage reducer factory wheel shape can be divided into cylindrical gear reducer, bevel gear reducer and cone-cylindrical gear reducer; According to the layout of the transmission form can be divided into expansion type, split type and into shaft type reducer. Reducer is a kind of closed in the rigid shell of the gear drive, worm drive, gear - worm drive composed of independent parts, commonly used as the original moving parts and working machine between the deceleration transmission device. In the prime mover and working machine or actuator between the matching speed and transfer of torque, in modern machinery is widely used.

Reducer is generally used in low speed high torque transmission device, the electric motor, internal combustion engine, or other high speed operating of power on the input shaft of the reducer gear of big gear on the output shaft gear mesh less to achieve the purpose of deceleration, ordinary there is few on the same principle of gear reducer and achieve ideal reduction effect, the size of the ratio of the number of teeth on the gears, transmission ratio.