Contact ratio: the average number of teeth in contact.

齿合系数 --- 啮合的平均齿数.

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Diametral pitch : the number of teeth per inch of pitch - circle diameter.

径节 --- 节圆直径每英寸长度上的齿数.

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When the number of teeth is less than the minimum, involute gears will be undercut.

当齿数较少时, 渐开线齿轮存在根切现象.

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NOTES: 1. Bottom diameter for even number of teeth, Caliper diameter for odd number of teeth.

注: 1. 底径用于偶数齿, 卡尺测量直径用于奇数齿.

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