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root form diameter(dFf)是渐开线起始圆吧?base diameter是基圆直径。6 F& e2 y1 d( R5 K3 W
下面是ISO 21771-2007 5.4.1的一段话
. L5 Q, y! r! k3 \- J5 _“The root form diameter, dFf, is the start of the involute portion of the profile. For an external gear it is the
" C B* n: a) ~7 Q$ Jgreatest of the base diameter, db, or the diameter of the intersection of the flank with the root fillet or trochoid
[% P9 W5 ^( F8 ^(taking into account undercut if necessary)”# j {" B: j# U/ ~/ h6 S
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)。
; }, I! Z3 J2 r9 q( z* t问题:翻译有没有问题?+ {0 O+ b: K: F
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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