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root form diameter(dFf)是渐开线起始圆吧?base diameter是基圆直径。
" z+ f" Q; q# s; j/ ]7 D: V4 y下面是ISO 21771-2007 5.4.1的一段话
) N7 u% ^% g* j“The root form diameter, dFf, is the start of the involute portion of the profile. For an external gear it is the
p4 S# s" I2 d; u( Z. }greatest of the base diameter, db, or the diameter of the intersection of the flank with the root fillet or trochoid
5 p1 J) M# |$ R5 Y3 K5 `(taking into account undercut if necessary)”
. N2 |2 h5 }" M" l e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)。
# |5 N- ^) B5 ^问题:翻译有没有问题?
2 |# ]& [+ M) `# R8 Q2 d9 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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