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root form diameter(dFf)是渐开线起始圆吧?base diameter是基圆直径。 3 f% K6 i X9 {* ]9 s下面是ISO 21771-2007 5.4.1的一段话6 U0 B0 z9 S. g; H “The root form diameter, dFf, is the start of the involute portion of the profile. For an external gear it is the 5 f( S9 `& [( i" E6 J# b7 a8 v$ }greatest of the base diameter, db, or the diameter of the intersection of the flank with the root fillet or trochoid1 n3 I' w r0 u1 m3 K$ M (taking into account undercut if necessary)” 9 \( J8 \0 Y9 |4 ~. n/ Q英语不好,翻错了请轻拍:渐开线起始圆是齿形渐开线起点所在的圆。对外齿轮来说最好就是基圆直径,或齿侧与过渡圆角的连接点(如果有根切,需要考虑在内)。+ E8 y) F: v" Q$ W Z& D, C$ h i 问题:翻译有没有问题? & I* r$ T i$ P3 U n2 L, t ]如果没问题,渐开线起始圆真的越靠近基圆越好吗,靠太近渐开线齿轮好加工吗? |
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