Abstract: During the operation of the air-conditioning deflector, the motor gears continuously mesh and are subjected to alternating loads. It can easily cause fatigue fracture and affect the movement of the air-conditioning fan panel, which affects the air supply function and overall reliability of the air-conditioning system. Therefore, conducting research on the strength and fatigue life analysis of the motor gears has important engineering significance. Based on the finite element method, the strength and fatigue life of the motor gear of the air-conditioning fan plate were analyzed. Firstly, a simplified finite element model of the motor gear set was established to obtain the gear strength. Furthermore, through Abaqus and Fe-safe joint simulation, the Wöhler curve of the gear material was fitted, and the fatigue life of the gear was predicted, which met the requirements under nominal torque. Finally, the reasons for fatigue fracture of gears under extreme conditions were discussed, providing reference for the structural reliability design of motion mechanisms and the selection of motor performance.

Key words: Motor gear, Strength check, Fatigue life analysis, Finite element analysis