关键词: 电驱桥减速器壳体；壳体强度；断口分析；仿真分析

Abstract: A light commercial vehicle new energy electric drive bridge, in the full load 6.5T, 30 000 km road durability test process, running about 6 000 kilometers, abnormal power interruption occurred. After investigation, it is found that the shell of the electric drive bridge reducer is broken in the area of the differential bearing mounting hole, and even some of the main reducer gear of the faulty product have broken teeth. The fracture of the shell is analyzed by scanning electron microscope and confirmed as overload fracture. Combined with the static strength simulation of the shell, the results show that the fracture source region is consistent with the region where the simulated stress of the shell strength exceeds the yield strength of the material. By optimizing the shell structure, the stiffness of the area is increased and the strain is reduced. Combined with simulation analysis and test verification, the performance requirements are met.

Key words: Electric drive bridge reducer housing; Housing strength; Fracture analysis; Simulation analysis