Abstract: The main function of the air-conditioning air guide driving mechanism is to drive the transmission mechanism rack to expand and contract through the forward and reverse operation of the stepper motor, and to complete the direction change through the trigger signal of the micro switch component to complete the air guide switch and air supply purpose. In the front end of the design, three-dimensional tolerance simulation and other analysis methods were used to analyze the theoretical reliability of the wind guide and drive mechanism, so as to solve the FC fault, abnormal sound, jitter and other problems occurred in the operation of the mechanism, and meet the quality development requirements

Key words: Air conditioner, Drive mechanism, Reliability, FC failure