直齿圆锥齿轮的外形,有时因结构需要或设计者的意图,其外圆例角有不同的形式常见的有图1所示几种。一般产品图样上所标注的齿厚和齿高均系指“理论大端”(即图1中小黑点处)的计算尺寸。但因倒角关系,“理论尖点”不复存在。单件小批生产时,往往要在大端进行齿厚测量;为保证直锥齿轮副的传动侧隙能控制在规定范围内,齿厚又必须测量准确,不 Spur bevel gear shape, sometimes due to structural needs or the designer’s intentions, the outer corner of the case has a different form of common are shown in Figure 1 several. The tooth thickness and the tooth height marked on the general product design all refer to the calculated size of the “theoretical big end” (that is, the small black spots in FIG. 1). However, due to chamfering, “theoretical cusp” no longer exists. Single-piece small batch production, tend to tooth thickness measurement at the big end; In order to ensure the straight bevel gear drive backlash can be controlled within the specified range, tooth thickness and measurement must be accurate, not