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《计量技术》辑编部: 根据机械工业部部标《渐开线圆柱齿轮精度》(JB179—83)要求,确定渐开线齿形测量部位,一般用两种方法;第一、按共轭齿轮啮合时的工作圆计算;第二、在相配齿轮不清楚时,按与标准齿条啮合时的工作圆计算。在按第二种方法计算齿廓起测点展开弧长b_1(或展开角φ_1,下同)时,一般都认为:齿数z≤16齿的齿轮,基圆半径r_b大于齿轮与标准齿条啮合时的工作圆半径R(即过齿条齿顶线与啮合线的交点T的圆,如图1所示),这时不需计
Department of Metrology: Department of Machinery Industry Department under the standard “involute cylindrical gear accuracy” (JB179-83) requirements, to determine involute tooth measurement sites, the general two ways; first, according to the conjugate The working circle when the gear meshing is calculated. Second, when the mating gear is not clear, it is calculated according to the working circle when engaging with the standard rack. In the second method to calculate the tooth profile measured from the starting arc arc length b_1 (or unfolding angle φ_1, the same below), generally considered: the number of teeth z ≤ 16 teeth of the gear base radius r_b greater than the gear meshing with standard gear When the working circle radius R (ie, over the top of the tooth mesh line and the intersection T of the circle, shown in Figure 1), then do not need to count