直齿锥齿轮在加工过程中的测量,通常都是用齿轮卡尺测量齿厚(单齿测量)。下面介绍一种用公法线长度L_n测量直齿圆锥齿轮齿厚的新方法。这种方法的优点在于,测量时不以齿顶圆作基准,故不受外径尺寸误差的影响,此外,通过测量公法线长度的变动量,可测出齿轮的周节或基节的累积误差等。用公法线长度测量直齿圆锥齿轮时,将测量量具接触在锥齿轮的大端背锥边缘上(如 Spur bevel gear in the process of measuring, usually with a gear caliper to measure tooth thickness (single tooth measurement). The following describes a new method of measuring the tooth thickness of spur bevel gears with the common normal length L_n. The advantage of this method is that the measurement is not based on the addendum circle and therefore is not affected by the dimensional error of the outer diameter. In addition, by measuring the variation of the length of the common normal, the accumulation of the periphery or base of the gear can be measured Error and so on. When measuring the straight bevel gear with the common normal length, contact the measuring gage with the edge of the large end of the bevel gear