一、前言 对于超小模数齿轮或小模数塑料齿轮,由于尺寸偏差与模数相比较大,因此计算重合度时必须考虑尺寸偏差的影响。 采用如下的方法计算重合度的统计值: 1.用公称尺寸计算重合度的初始值; 2.将影响重合度的各尺寸公差带的中线对应的尺寸与相应公称尺寸之差值作 I. Introduction For ultra-small modulus gears or small modulus plastic gears, the size deviation must be taken into consideration when calculating the degree of coincidence because of the large dimensional deviation compared with the modulus. The following method is used to calculate the statistical value of the coincidence degree: 1. Calculate the initial value of the coincidence degree with the nominal size; 2. Make the difference between the corresponding size and the corresponding nominal size of each tolerance zone