...The outermost part of a thread is called the crest, while the innermost part of a thread is called the root. The surface that connects the crest and root is called the flank, and the angle between two adjacent flanks is called the thread angle (Figure 3). Up until now, we have considered threads with threads that run along a helix on the surface of a cylinder, but there are also some that use a conical surface instead of a cylinder, and these are called tapered threads. ... *Some of the terminology that mentions "frank" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
… ねじ山のうち,おねじではもっとも外側,めねじではもっとも内側にある部分を山の頂といい,逆におねじではもっとも内側,めねじではもっとも外側にある部分を谷底という。また山の頂と谷底を連絡する面(軸線を含んだ断面形では一般に直線に規定されている)をフランクfrankといい,隣り合う二つのフランクのなす角をねじ山の角度という(図3)。 今まで円筒の表面状のつる巻線に沿ってねじ山をもつねじを考えてきたが,円筒のかわりに円錐表面を用いたものもあり,これをテーパーねじという。… ※「frank」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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