Reducer is widely used in modern instruments. Reducer is a separate closed rotation and transmission between the original machine and the working machine, which can meet all kinds of work needs. The reducer in the washing machine is a separate rotating accessory between the motor and the pulsator in the washing machine. Its main function is to slow down and increase the power, thus driving the pulsator to rotate and work, thus making the rotating spin-drying bucket stop immediately. The principle of this reducer is the same as that of bicycle braking.