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root form diameter(dFf)是渐开线起始圆吧?base diameter是基圆直径。
) n$ n1 v+ u! {6 r. \) y# c! H% V下面是ISO 21771-2007 5.4.1的一段话3 h1 f6 ^2 J7 p) `6 C7 J( l- B0 b
“The root form diameter, dFf, is the start of the involute portion of the profile. For an external gear it is the
2 ^3 e7 Z- f1 Sgreatest of the base diameter, db, or the diameter of the intersection of the flank with the root fillet or trochoid6 q& z3 G% i5 ~
(taking into account undercut if necessary)”5 _' X- [% }5 Z" ] {3 v4 }
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)。7 Y" i: T* \3 q0 B) B7 ~- K
问题:翻译有没有问题?1 f7 S9 z$ z* T: f
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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