rack

Japanese: rack
rack

...Instead of having teeth on the cylindrical surface, an internal gear has teeth on the inner surface of the cylinder (Figure 6-b). A spur gear with an infinite diameter is called a rack (Figure 6-c), and by combining it with a small gear (called a pinion in this case), it can convert between linear motion and rotary motion. In addition, since an involute curve becomes a straight line when the diameter is infinite, the rack tooth profile of an involute gear is a straight line tooth profile.

*Some of the terminology that mentions "rack" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…円筒面上に歯筋を設ける代りに,円筒の内面に歯筋を設けたものが内歯車である(図6‐b)。また平歯車の直径を無限大にしたものがラックrackで(図6‐c),小歯車(この場合ピニオンpinionと呼ばれる)と組み合わせることによって直線運動と回転運動との間の変換を行うことができる。なお,インボリュート曲線は直径を無限大にすると直線になるので,インボリュート歯車ではラックの歯形は直線歯形となる。…

※「rack」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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