小模数蜗杆一般是指模数小于1mm的蜗杆。小模数蜗杆的轴向齿距较小,要测量其法向齿厚就比较困难。为此,常用量棒置于齿槽中来测量跨棒距M。但在M值测量中,查不到有关尺寸偏差M,故本文就此作主要讨论。一、S和d的计算蜗杆齿厚减薄量为S,与其相应的分度圆直径变动量为d。 (1)关于蜗杆齿厚减薄量中的上、下偏差一般在图纸上都予以注明。例如:有一蜗杆轴向模数m=0.5、头数k=1、分度圆直径d=8.5、蜗轮副中心距如按8-Dc级精度查有关手册,可得:蜗杆法向齿厚及其齿厚偏差S为:其中: Small modulus worm generally refers to the modulus of less than 1mm worm. Small modulus worm axial pitch smaller, to measure the normal tooth thickness is more difficult. For this purpose, a common gauge rod is placed in the alveolus to measure the span M. However, in the measurement of M value, the size deviation M can not be found, so this article mainly discusses this. First, the calculation of S and d worm gear thickness reduction S, and its corresponding indexing circle diameter variation of d. (1) The upper and lower deviations in the thickness reduction of worm teeth are generally indicated on the drawings. For example: a worm axial modulus m = 0.5, the number of heads k = 1, d = 8.5 pitch circle, worm gear center distance, such as by 8-Dc level check the relevant manual precision available: worm tooth thickness and The tooth thickness deviation S is: Among them: