Abstract:In the remanufacturing process of engineering machinery, the characteristic of tooth root crack is treated as a main test standard for gear failure, which directly decides the remanufacture processing scheme for recycled gears. A gear strength analysis method based on crack modeling was introduced. According to the cracks statistics in recycled gears, a series of geometrical parameters of the crack characteristic were designed and introduced into gear pair models with the modeling technique for tooth root crack. These models were analyzed in static status by finite element analysis (FEA) method using Ansys system. The curves that described the relation of maximum equivalent stress Von Mises in the gear interior with the crack geometrical parameters were obtained. The results show that as compared with the Max. Von Mises 108 MPa at pulled side of tooth without root crack, the variable range of Von Mises at place of crack is 301~890 MPa, which shows obviously concentration effect of stress with tooth root crack. Under the condition of same geometrical parameters, the Max. Von Mises at middle place of crack is larger than that of at end place, and the middle place of crack has larger influence on stress concentration. Curvature of curve of change along depth is larger than that of length by the Max. Von Mises of crack, and the depth of crack has stronger influence than that of length on Max. Von Mises.