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root form diameter(dFf)是漸開線起始圓吧,?base diameter是基圓直徑,。6 l! C$ S1 a3 o8 W
下面是ISO 21771-2007 5.4.1的一段話- p3 k* t G' q5 U; N% T
“The root form diameter, dFf, is the start of the involute portion of the profile. For an external gear it is the) U( `: z. E; ~+ B/ w, D. D
greatest of the base diameter, db, or the diameter of the intersection of the flank with the root fillet or trochoid
: d& J" c( ]& ?0 e0 q# v; h(taking into account undercut if necessary)”" C Z8 j3 [) n. b6 C r
英語不好,,翻錯了請輕拍:漸開線起始圓是齒形漸開線起點所在的圓,。對外齒輪來說最好就是基圓直徑,,或齒側與過渡圓角的連接點(如果有根切,需要考慮在內),。! t# u' ~. l% ~- t
問題:翻譯有沒有問題,?1 R- B3 G1 r, c& P. C
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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