【20160417】Profile-shifted gears
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, N% L# j! W6 ~8 g+ nTo avoid interference on small pinions, the tooth form can be changed from the standard.
: C) [9 |$ }: T4 [9 ~" H为避免小齿轮的干涉问题,齿的形状可以从标准型作适当转化。
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Standard gears:, B; E D: Q! o5 k8 B4 `
apinion= agear' m8 G9 x2 M! _6 I/ E: Z" O1 U9 s% \
标准齿轮:大轮小轮齿顶高相等
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+ b; }+ Z/ G/ S1 s8 lProfile-shifted gears:
, ~- l2 i: a; J; papinion> agear9 X) t. |4 O! X1 h
变位齿轮:小轮齿顶高大于齿根高! `, @# t0 Z3 F
: B. P$ B: n2 x% j \The AGMA defines addendum modification coefficients, x1 and x2.
' T& F& Y* J0 A4 x3 {; f6 yx1>0: is applied to increase the pinion addendum: G" V/ Z% R0 G" l$ V, U3 g" [5 ^
x2<0: is applied to decrease the gear addendum9 ^$ s; u% g- ?
X1提高小轮齿顶高,X2提高大轮齿顶高。/ Z7 Z8 x9 `: {2 z" N4 x+ i
/ x6 `; h: F! m8 `+ @Objective
* |5 @: k, H5 k8 X, H. \& O: ITo shift the pinion addendum circle outside its base circle and eliminates the noninvolute portion of pinion tooth below the base circle.
( k b6 F( y" h! x4 y E; V! tThe standard coefficients are ±0.25 and ±0.506 c' h, S+ Y) L# _$ @+ E" j# @
目标
( a+ Q+ ^) b; y改变小轮基圆外的齿顶高,减小基圆内非渐开线部分的齿。( ?' |3 x' F/ ~. @# j- u9 X# k1 X
标准系数正负0.25和正负0.5.
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