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在加工直齿渐开线齿轮或渐开线花键轴的过程中,经常使用两个标准圆柱形量棒来测量渐开线齿轮或渐开线花键轴分度圆弧齿厚,如图所示。图中跨棒距种量值M与渐开线齿轮或花键轴(以下抗称为齿轮)分度圆弧齿厚S之间的关系如下: 偶数齿时:M=d_0/cosα_M+d_p…………(1) 奇数齿时:M=d_0/cosα_M·cos(90°/Z)+d_p…(2) 式中:d_0—齿轮基圆直径;d_p—标准圆柱量棒(以下简称量棒)直径,一般取d_p=1.68m_s,并取成标准值;m_s—齿轮端面模数;α_M—量棒中心所在圆上的压力角。α_M按下式计算:
In the process of machining involute spur gear or involute spline shaft, two standard cylindrical gauges are often used to measure the tooth thickness of involute gear or involute spline shaft, as shown in the figure As shown. The relationship between the magnitude M of the spans of the spans and the tooth pitch S of the involute gear or spline shaft (hereinafter referred to as the gear) is as follows: Even teeth: M = d_0 / cosα_M + d_p (2) where: d_0- base circle diameter of the gear; d_p-standard cylinder rod (hereinafter referred to as the rod ) Diameter, generally take d_p = 1.68m_s, and take the standard value; m_s-gear modulus; α_M-the center of the circle where the rod pressure angle. α_M is calculated as follows: