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root form diameter(dFf)是漸開(kāi)線起始圓吧,?base diameter是基圓直徑,。
* D- V( n1 Q6 O4 m! E0 L8 O下面是ISO 21771-2007 5.4.1的一段話
8 v( l$ U# k1 M4 T* b$ B, x6 x“The root form diameter, dFf, is the start of the involute portion of the profile. For an external gear it is the
, g- x, Y# f& K/ [$ a8 P" G% f4 Xgreatest of the base diameter, db, or the diameter of the intersection of the flank with the root fillet or trochoid
% s- b7 d& a: l% N(taking into account undercut if necessary)”
l3 Q5 V% c9 C- ~英語(yǔ)不好,,翻錯(cuò)了請(qǐng)輕拍:漸開(kāi)線起始圓是齒形漸開(kāi)線起點(diǎn)所在的圓,。對(duì)外齒輪來(lái)說(shuō)最好就是基圓直徑,,或齒側(cè)與過(guò)渡圓角的連接點(diǎn)(如果有根切,需要考慮在內(nèi)),。, z+ [% ^3 A& n) e+ w. I! J
問(wèn)題:翻譯有沒(méi)有問(wèn)題,?% \( |8 l; v) s/ L' Y# n N0 _
如果沒(méi)問(wèn)題,漸開(kāi)線起始圓真的越靠近基圓越好嗎,,靠太近漸開(kāi)線齒輪好加工嗎,? |
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