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root form diameter(dFf)是渐开线起始圆吧?base diameter是基圆直径。
( g+ u2 l" j$ H7 \下面是ISO 21771-2007 5.4.1的一段话
3 U; O) z6 D' Y3 g. N" i* x9 h, g“The root form diameter, dFf, is the start of the involute portion of the profile. For an external gear it is the
1 e3 J2 \( A" _1 I/ W( }/ egreatest of the base diameter, db, or the diameter of the intersection of the flank with the root fillet or trochoid3 A& G8 \- h1 Z9 G( h" @1 \
(taking into account undercut if necessary)”
9 Y( y, _1 I; C- A3 j! b3 W" 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)。
! @" ^% D7 j W# q0 {问题:翻译有没有问题?6 `: e! Z5 v1 x
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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