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root form diameter(dFf)是渐开线起始圆吧?base diameter是基圆直径。 . l8 h. Z7 Y( D* V' E+ S+ ~下面是ISO 21771-2007 5.4.1的一段话1 H9 {6 }' |% k “The root form diameter, dFf, is the start of the involute portion of the profile. For an external gear it is the, b X7 q5 J% g# I greatest of the base diameter, db, or the diameter of the intersection of the flank with the root fillet or trochoid / W# G e: D7 j( b( ](taking into account undercut if necessary)” $ H- q' N% I2 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)。 5 i6 f7 g' l1 J2 x4 U问题:翻译有没有问题? 2 g+ Y( Y1 _, ~2 |% u. O: A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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