标准齿轮按标准中心距安装时具有标准顶隙 ,顶隙和齿轮传动几何尺寸之间具有固定的关系。考虑到变位齿轮传动计算的特殊性 ,在利用顶隙计算齿轮传动几何尺寸时 ,可以不借助各种复杂的系数 ,推导出一定公式 ,给齿轮传动的设计、制造以及现场测绘带来诸多便利。通过计算实例说明了这一方法的工程合理性 The standard gear has a standard clearance gap when installed from the standard center distance with a fixed relationship between the headspace and the gear drive geometry. Considering the particularity of displacement gear drive calculation, when using the clearance to calculate the gear geometry, we can derive some formulas without using complicated coefficients, and bring many advantages to the design, manufacture and on-the-spot mapping of gear drive . The calculation example illustrates the engineering rationality of this method