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root form diameter(dFf)是渐开线起始圆吧?base diameter是基圆直径。
8 P. [0 W4 L" F# \/ H3 M2 v# B+ j( i0 z下面是ISO 21771-2007 5.4.1的一段话
4 Q" U( Y- W3 e) ^“The root form diameter, dFf, is the start of the involute portion of the profile. For an external gear it is the+ z2 w" P: O3 [. |7 _
greatest of the base diameter, db, or the diameter of the intersection of the flank with the root fillet or trochoid
0 U6 ]3 o9 q* ]7 S. @& h$ E(taking into account undercut if necessary)”7 R2 t0 z1 x+ d! C" h$ e
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)。
% {% t. Z ^8 \问题:翻译有没有问题?
; G3 ~7 d+ Q$ c 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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