gear pair with small teeth difference
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渐开线少齿差齿轮副，由于是内啮合，齿轮副的齿对之间的间隙很小，在受力后轮齿变形而使得同时有多对齿啮合。
As the gap of teeth of internal matins gears with small tooth number difference is small, several teeth will mate simultaneously after the teeth are deformed by load.
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