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root form diameter(dFf)是渐开线起始圆吧?base diameter是基圆直径。
- ?4 w/ i g6 `. J( y下面是ISO 21771-2007 5.4.1的一段话
g! r2 G* w* B' s6 v( Y9 ^; \0 S“The root form diameter, dFf, is the start of the involute portion of the profile. For an external gear it is the: J! a4 U4 @5 K
greatest of the base diameter, db, or the diameter of the intersection of the flank with the root fillet or trochoid
! I U9 J5 `8 h9 [% t(taking into account undercut if necessary)”
- U4 u% M! z9 W& @) I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)。$ J5 }& z: A" J) g) _* i" t5 P/ l
问题:翻译有没有问题?, l' }- s; W& D7 T: ?
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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