正常齿制，m=4mm，a=20°。
在渐开线少齿差行星传动中通常使用短齿，其齿根高与正常齿相同，而齿顶高小于正常齿。
The stub gear tooth is often adopted in the involute planetary gear transmission with a few tooth number difference.
通过利用这些模型，可以得到滚筒的速度、加速度、作用在变化齿对的正常受力和效率。
By using these models, the velocity, acceleration, normal forces acting on the conjugated pairs and efficiency of roller drives can be obtained.
因此，在齿面非正常接触导致齿顶接触应力过大的情况下，该齿轮发生了早期疲劳剥落。
Due to the above mentioned defects, early fatigue peeling occurs under the condition of overly contact stress at the top of the tooth caused by abnormal contact at the tooth surface.
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