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root form diameter(dFf)是漸開線起始圓吧?base diameter是基圓直徑。# ^) P4 W0 J- w, M0 H% R
下面是ISO 21771-2007 5.4.1的一段話
6 d; z/ `/ l& ~+ R“The root form diameter, dFf, is the start of the involute portion of the profile. For an external gear it is the! {3 a8 h c6 A/ n$ j2 [: [# p. b
greatest of the base diameter, db, or the diameter of the intersection of the flank with the root fillet or trochoid
5 r6 o/ t+ ~9 x W& P(taking into account undercut if necessary)”0 p- c' S- f5 X% a" X$ p5 p9 U
英語不好,,翻錯(cuò)了請輕拍:漸開線起始圓是齒形漸開線起點(diǎn)所在的圓。對外齒輪來說最好就是基圓直徑,,或齒側(cè)與過渡圓角的連接點(diǎn)(如果有根切,,需要考慮在內(nèi))。
- c8 f: ~) T) y; Z7 C問題:翻譯有沒有問題,?
8 |6 L; z# X1 D; ?) f 如果沒問題,,漸開線起始圓真的越靠近基圓越好嗎,靠太近漸開線齒輪好加工嗎,? |
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