形位公差对小模数直齿轮传动系统精度的影响

Influence of Space and Place Error on the Accuracy of Fine-pitch Spur Gears Transmission System

形位公差是零件形状和位置特征变动的结果,形位特征的变动对于精密传动的传动精度产生很大影响。目前在小模数直齿轮传动系统精度计算中仅考虑齿轮副尺寸公差、齿轮副扭转弹性空回程、温度变化引起的圆周侧隙等,没有考虑形位公差的影响。本文以小模数直齿轮传动系统为研究对象,研究箱体形位公差对传动精度的影响。通过分析箱体的平行度、同轴度、垂直度等形位公差的定义,得出平行度、垂直度对中心距的影响,提出在独立原则下的小模数齿轮传动精度的计算方法,为计算小模数齿轮传动精度提供思路。最后通过一个工程应用实例,说明提出计算方法的必要性。

Space and place error is the result of the change of parts′space and place characteristics,and the change of space and place characteristics has a great influence on the transmission accuracy of precision transmission.At present,in the accuracy calculation of finepitch spur gears transmission system,only the dimensional tolerance of gear pair,the torsional elastic backlash of gear pair,and the circumferential backlash caused by temperature change are considered,and the influence of form and space and place error is not considered.Taking fine-pitch spur gears transmission system as the object,the influence of box space and place error on transmission accuracy is studied.By analyzing the definition of space and place error such as parallelism,coaxiality and perpendicularity of the box,the influence of space and place error on the center distance is obtained,and the calculation method of fine-pitch spur gear transmission accuracy under the principle of independence is proposed,which provides ideas for calculating fine-pitch spur gears transmission accuracy.Finally,an engineering application example is given to illustrate the necessity of the proposed calculation method.