外齿轮：轮齿在外圆上的是外齿轮，轮齿在内圆上的是内齿轮。在机械上很常见的就是外齿轮。 一般分度圆的周长为：L=M*Z。
绳下降笨重的外齿轮与多个睫毛点。
用于外齿轮加工的径向剃齿刀，其齿向曲线为内凹超越曲线，这给剃齿刀的刃磨带来了困难。
The tooth curve of a plunge shaving cutter for an external gear is a recess transcendental curve, so it is difficult to grind it.
按照传动形式的不同将传动系统分为圆柱外齿轮系和行星齿轮系两类，分析了每一类中多个典型案例。
According to driving type, the driving systems were classified into two groups, including the cylindrical gear system and the planet gear system.
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