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root form diameter(dFf)是漸開線起始圓吧,?base diameter是基圓直徑,。 `$ \, W- x" [9 o* ~- z' F
下面是ISO 21771-2007 5.4.1的一段話# n& F& f" a& |% E2 A
“The root form diameter, dFf, is the start of the involute portion of the profile. For an external gear it is the
" I- F2 o6 l8 D" U9 ]greatest of the base diameter, db, or the diameter of the intersection of the flank with the root fillet or trochoid
" X _, N3 C6 R2 d(taking into account undercut if necessary)”
4 `5 L+ u5 a0 S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))。
# ~: ~4 d. d% r" x2 D3 A {7 \問題:翻譯有沒有問題,?, m$ f) w4 _# J1 S+ ^( ?# S/ A
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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