内燃机中的活塞与缸套在修理中需预先准确地测量出其几何尺寸的变化情况,为制定修理工艺和选配提供依据。但由于这两个零件属非均匀磨损件,因此实际工作中如不能掌握这类零件的磨损规律和准确地测量部位,所测出的尺寸往往是虚假的,从而影响维修工作的质量,甚至造成浪费。活塞在工作中沿缸套内表面往复运动,承受燃烧室的气体压力、传递动力可分为两种情况:即爆发冲程(图1a)和压缩冲程(图1b),其中力N 作用于缸套内表面上,造成 Internal combustion engine piston and cylinder liner in the repair needs to be accurately measured in advance the changes in the geometric dimensions, to develop a repair process and matching provide the basis. However, since the two parts are non-uniform wear parts, the actual work if they can not grasp the wear rules of such parts and accurate measurement of the site, the measured size is often false, thus affecting the quality of maintenance work, and even caused waste. Pistons work reciprocating along the inner surface of the cylinder liner to withstand the gas pressure in the combustion chamber. The transmission of power can be divided into two situations: the explosion stroke (Figure 1a) and the compression stroke (Figure 1b), where the force N acts on the cylinder liner Inner surface, caused