用质量损失函数确定渐开线圆柱齿轮精度

Determining the Accuracy Grades of Cylinder Gears with the Quality Loss Functions

在齿轮的第Ⅰ、Ⅱ、Ⅲ公差组中，选择具有综合性的公差或极限偏差项目作为目标，建立质量损失函数，计算它们的工厂容差，再按标准决定它们所属公差组的精度等级。由实际传动要求定出齿轮副侧隙的最小值、最大值及用户容差；考查齿厚（公法线长度）的波动和齿轮中心距的波动对侧隙波动的影响；计算每项指标的工厂容差，确定其公差和极限偏差，并选择齿轮副的侧隙代号。

From the tolerance groups of numbered Ⅰ,Ⅱ,and Ⅲ,one comprehensive tolerance or limits deviation is chosen as an object of the quatity loss functions and its work s allowance can be calculated by use of the function.And then the accuracy grade of the relevant tolerance group is determined by the corresponding work s allowance.The minimum and maximum backlash of gearing are resolved in view of the transmission requests.Considering the functions to backlash are due to Ess,Ews, and fa,wa can calculate their work s allowances and obtain standard tolerances and limits deviations.