Lightweight research of automobile electric door lock parts

In order to realize the lightweight of an automobile electric door lock, the gear plate, an important part of the electric branch chain on the door lock was taken as the research object. According to the stall working condition of closing lock and child lock of the gear plate, the finite element models under two working conditions are established respectively. Before optimization, determine whether the gear plate has optimization space according to the static analysis results of the gear plate under two working conditions. After dividing the design domain of the gear plate, the multi-model topology optimization method based on the variable density method is used to optimize the gear plate, taking the maximum stress of the gear plate not exceeding the allowable stress as the constraint condition, taking the minimum mass of the gear plate as the objective function, and taking into account two working conditions as described above. Then, the optimization model of the gear plate is obtained, and the relatively rough optimization results are redesigned according to the actual machining needs, and the static analysis is carried out to verify. Finally, on the premise of meeting the design requirements, the optimized gear plate mass is reduced by 9.9 g, and the mass reduction percentage is about 32%.