一般齿轮齿形曲线在一点邻域的高阶阶戴劳级数展开后，会发现齿面啮合点邻域间隙为2阶无穷小。

The common gear tooth profile curve launches after neighborhood higher order step taylor's series, can discover the tooth face meshing point neighborhood gap is 2 step infinitely greats.

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因此，研究一阶无穷小位移机构的刚化问题是非常重要的。

So the studies on the mechanism system are very important.

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