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root form diameter(dFf)是渐开线起始圆吧?base diameter是基圆直径。1 A0 s6 e5 }" n/ ]. d
下面是ISO 21771-2007 5.4.1的一段话2 \: H% X' n, ]3 E6 |3 K% W# X
“The root form diameter, dFf, is the start of the involute portion of the profile. For an external gear it is the) j$ o& V% H. Q3 `/ `
greatest of the base diameter, db, or the diameter of the intersection of the flank with the root fillet or trochoid
6 h" S5 f C7 G5 d( ](taking into account undercut if necessary)”# k# ]/ ^( I* X4 H
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)。
) [8 J; s% J2 L7 K3 m: C问题:翻译有没有问题?+ |( B% Q* |; N) t c# S
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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