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【20160416】Undercutting: A# T1 F2 t1 [" ^/ o
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Interference can also be avoided by removing the material on the gear tooth between the base circle and dedendum circle. This is the portion of the gear tooth that is not an involute and would interfere with the mating tooth. An undercut gear tooth is shown in Figure 10.11.2 b6 a4 U) o5 @
通過切除基圓與齒根圓間的材料也可以做到避免干涉。齒輪的這部分不具有漸開線廓線,會導(dǎo)致配合齒輪的干涉。如圖為一掏槽齒輪的齒。
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0 Y# \% p* X) u% UUndercutting obviously reduces the strength of the gear, thus reducing the power that can be safely transmitted. In addition, it also reduces the length of contact, which reduces the contact ratio and results in rougher and noisier gear action. Therefore, undercutting should be avoided unless the application absolutely requires a compact gear set. In these cases, advanced kinematic and strength analyses and experiments are necessary to verify proper operation.
! o# H2 W& s, h顯然,掏槽降低了齒輪的強度,因此力可以平緩傳遞。(齒輪傳遞力需要高韌性,否則很脆,強度降低可以理解為韌性提高)同時這也減少了接觸的長度,使得接觸比降低,配合會產(chǎn)生更大噪音。因此,應(yīng)盡量避免使用掏槽,除非必須要用到緊湊的齒輪組。這時需要更高級的運動分析和實驗擬合。2 K) l3 x+ T% X0 [/ I, q: r4 D# s; t
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