By comparing the results of calculation, we can get that the modulus of the two groups is larger according to the contact fatigue strength of tooth surface. Because the bending strength determines the bearing capacity of the gear, and can determine the module of the gear. At the same time, the diameter of the gear determines the contact strength of the tooth surface and its bearing capacity. Therefore, the calculation modulus is adopted according to the calculation value of the bending strength, and the value is optimized by taking the value
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