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曲柄销的耐磨性在很大程度上取决于表面光洁度、尺寸和形状的精度,也取决于其圆柱部分和曲轴端面的表面层质量。连杆轴颈的疲劳强度取决于联结轴颈圆柱面和端面的圆根表面的光洁度和质量,也取决于曲轴轴颈表面层上剩余应力的符号、纵深和数值。此外,曲轴连杆轴颈——连杆轴瓦付的表面质量和耐磨性取决于曲轴轴颈表面最后那道精磨工序的加工余量。己知〔1〕曲轴轴颈——连杆轴瓦摩擦付（在精磨时,轴颈表面余量去掉50微米,达到10～11级光洁度）的寿命比表面加工余量为5～15微米而取得同样表面光洁
The wear resistance of the crankpin depends very much on the precision of the surface finish, size and shape, and on the quality of the surface layer of its cylindrical part and crankshaft end face. The fatigue strength of the connecting rod journal depends on the finish and quality of the root surface of the cylindrical surface and the end surface of the coupling journal and also on the sign, depth and value of the residual stress on the surface layer of the crankshaft journal. In addition, the surface quality and wear resistance of the crankshaft connecting rod journal-connecting rod bearing depends on the machining allowance of the final grinding of the crankshaft journal surface. It has been known [1] crankshaft journal - connecting rod friction pay (in the fine grinding, the journal surface allowance to remove 50 microns, reaching 10 to 11 smooth finish) than the surface life of 5 to 15 microns Get the same smooth surface