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變位系數的確定及零齒差幾何尺寸及參數表

2014-10-17 11:35 作者:管理員11 來源:未知 瀏覽: 字號:

摘要:變位系數應使其既滿足嚙合方程,又滿足有關的限制條件。 從零齒差內嚙合的嚙合方程可知,在給定中心距及齒形角之后,待求的參數是徑向變位系數x1,x2以及切向變位系數x2和xa。確定這些變位系數的方法不止一種,下面只介紹其中一種。 零齒差的模數總比少齒差

    變位系數應使其既滿足嚙合方程,又滿足有關的限制條件。
    從零齒差內嚙合的嚙合方程可知,在給定中心距及齒形角之后,待求的參數是徑向變位系數x1,x2以及切向變位系數x2和xa。確定這些變位系數的方法不止一種,下面只介紹其中一種。
    零齒差的模數總比少齒差的模數大一些(一般大0.5一1倍),所以零齒差的齒數有時比較小,這應特別注意內齒輪在插齒時不產生徑向進刀頂切,驗算時可按照表9.2-32中的有關公式及說明。設計時根據插齒刀的參數及內齒輪的齒數由表,.2-34可以查出內齒輪的變位系數x2。當x2越大時,對于避免這種干涉越有利,所以只要齒頂厚足夠,x2也可選取比表9.2一34中所列數據再大一點的數值。
    其次再根據重合度的要求確定外齒輪的變位系數x1。由重合度的計算式可知,切向變位系數與重合度無關,只要α、a及x2為不變的常量,便可按重合度的預期值用逐步通近法求得相應的x1。其迭代程序如下


   

5.3.7零齒差幾何尺寸及參數表

    配用于一齒差傳動的零齒差幾何尺寸及參數列于表9.2-41。
配用于一齒差傳動的
零齒差幾何尺寸及參數表
 
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