一、前言遵照伟大领袖毛主席关于走自己工业发展道路的指示,为提高国产柴油机质量,几年来,我所在提高柴油机曲轴弯曲强度方面进行了一些工作,其中包括结构、工艺、疲劳试验等方面。在结构应力分析中,主要是改进单拐结构以提高曲轴弯曲静载与动载强度,并减轻曲轴重量、简化工艺。曲轴是发动机的主要承载零件之一,在使用中发生的曲轴断裂情况,暴露出曲轴在强度方面是存在问题的。再者为进一步改进柴油机的性能,采用低增压技术,提高功率指标、现有的曲轴也不能满足要求。因此各有关单位曾从不同的方面对曲轴强度问题进行过很多试验研究。国外对曲轴的强度问题已经进行了广泛深入的研究,如G·Stahl 针对薄柄臂的汽油机曲轴,就轴颈直径、柄臂宽度、厚度、过渡圆角半径、重迭度等结构参数对曲轴强度的影响 I. Preface In accordance with the instructions of Chairman Mao, the great leader, on his own way of industrial development, in order to improve the quality of domestic diesel engines, some efforts have been made to improve the bending strength of diesel engine crankshafts in recent years, including structure, workmanship and fatigue tests. In the structural stress analysis, the main one is to improve the single-turn structure to improve the crankshaft bending static load and dynamic load strength, and reduce the crankshaft weight and simplify the process. Crankshafts are one of the major load-bearing parts of the engine and the crankshaft breakage that occurs during use reveals that there is a problem with the crankshaft in terms of strength. Furthermore, to further improve the performance of diesel engines, the use of low supercharging technology to improve power specifications, the existing crankshaft can not meet the requirements. Therefore, the relevant units have conducted many experiments and studies on the strength of crankshafts from different aspects. Crankshaft strength abroad, the problem has been extensively studied, such as G · Stahl for thin-arm gasoline engine crankshaft, journal diameter, arm width, thickness, transition fillet radius, overlap and other structural parameters of the crankshaft The impact of strength