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root form diameter(dFf)是渐开线起始圆吧?base diameter是基圆直径。1 s( S" J# J6 w1 E* B% O
下面是ISO 21771-2007 5.4.1的一段话
; e4 T0 _- C9 P( S' ?# u0 w“The root form diameter, dFf, is the start of the involute portion of the profile. For an external gear it is the5 ~2 h2 ]- K1 v
greatest of the base diameter, db, or the diameter of the intersection of the flank with the root fillet or trochoid
3 ?" M" v& t% g6 C1 t( R+ A(taking into account undercut if necessary)”
6 ^5 }, ]( P y B9 L$ q$ `/ n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)。
x. B+ C' N5 V8 y, k问题:翻译有没有问题?
$ g5 T N2 s2 F: J 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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