The calculation results demonstrate the effective eccentricity and the lifting force of the upper drill string are the major influential factors. 计算结果表明，有效偏心距和上部钻柱的提升力是影响近井口套管偏磨的主要因素。
The fit-lost condition in gear mesh is analysed, and the relationship between tooth drum guantity of Klingelnberg Spiral bevel gear sysytem and tooth plate eccentricity is derived. 分析了齿轮副啮合中的失配现象，并推导了克林贝格螺旋锥齿轮副轮齿的鼓形量与刀盘偏心距之间的关系。
