Volcanic lithological character is involute. Owing to the influence of volcanic formation fashion and structure, distribution of lithology has obvious rule either in portrait or in landscape.
火山岩岩性复杂，由于受火山岩形成方式和构造的影响，岩性分布无论在纵向还是横向上都无明显的规律性；
The transmission part is an involute gear, and the working part can adopt different working faces, such as a cylinder excircle face, a circular arc tooth or an involutes tooth gear top cavetto.
传动部分是渐开线齿轮，工作部分可采用不同的工作面，如圆柱外圆面或圆弧形齿或渐开线齿轮齿顶修圆。
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