齿轮传动的计算⑴闭式传动闭式传动的主要失效形式为齿面点蚀和轮齿的弯曲疲劳折断。当采用软齿面（齿面硬度≤350HBS）时，其齿面接触疲劳强度相对较低。因此，一般应首先按齿面接触疲劳强度条件，计算齿轮的分度圆直径及其主要几何参数（如中心距、齿宽等），
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