Cylindrical gear - Entouhaguruma

Japanese: 円筒歯車 - えんとうはぐるま
Cylindrical gear - Entouhaguruma

...For this reason, extremely small numbers of teeth are generally not used in practice. To briefly note the minimum number of teeth for cylindrical gears (gears with a cylindrical pitch surface, such as spur gears and bevel gears), for involute spur gears, if the number of teeth is equal for a pair of gears, the minimum number is five. For cycloid gears, the minimum number is three. ...

*Some of the terminology that refers to "cylindrical gears" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…このため一般には,極端に少ない歯数は実際には使われない。円筒歯車(平歯車,かさ歯車など,円筒をピッチ面とする歯車)において,最小歯数は何枚であるかについて,簡単に記しておくと,インボリュート平歯車の場合は,1組の歯車で歯数が等しい場合は最小歯数は5枚である。サイクロイド歯車では3枚が最小歯数である。…

※「円筒歯車」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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