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The strength design of gears, like the design of general machinery, is carried out with the aim of preventing damage, and among various designs, strength design occupies a particularly important position. The strength design for gears is mainly conducted regarding: - Bending strength of the teeth - Surface pressure strength of the tooth surface - Scoring strength against tooth surface seizure There are many types of gear damage, but they can be broadly classified into "tooth breakage" and "tooth surface damage." Common examples of tooth breakage include fatigue breakage and overload breakage. Fatigue breakage occurs when a load is repeatedly applied that generates bending stress exceeding the material's fatigue limit, causing cracks that begin at the root fillet of the tooth to propagate and lead to tooth breakage. Overload breakage occurs when an extremely large overload acts on the tooth, resulting in breakage due to one or a few cycles of slight load repetition.