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依发W50L型汽车在使用前期一般不发生曲轴断裂问题,但在使用后期,曲轴断裂现象逐渐产生,断裂部位大都在连杆轴颈根部与曲柄臂应力集中区。针对这一情况,我们分析了断裂原因,加强了措施,收到了一定效果。现介绍如下。一、曲轴断裂原因浅析 1、主轴承间隙过大,特别前后主轴承间隙过大,增加了冲击载荷,一缸和四缸连杆轴颈根部工作特别恶化。因为曲轴前有皮带轮,后有飞轮,以致先在该两缸曲柄臂处断裂。如图1a、d。 2、曲轴止推垫表面烧蚀或磨损造成曲轴端隙过大,发动机工况变动时,造成曲轴轴向窜动,曲柄臂受端面冲击作用更大。由于应力集中,曲轴的第二缸曲柄臂处断裂,如图1b。
According to the development of the W50L automobile, crankshaft rupture generally does not occur in the early stage of use, but the crankshaft rupture gradually occurs in the late stage of use. Most of the rupture parts are in the stress concentration area of the crankpin and root of the connecting rod. In response to this situation, we analyzed the causes of the fracture, strengthened the measures and received some results. Now introduced as follows. First, the crankshaft fracture analysis 1, the main bearing clearance is too large, especially before and after the main bearing clearance is too large, an increase of impact load, one-cylinder and four-cylinder connecting rod root work worsened. Because the crankshaft in front of the pulley, flywheel, so that the first two-cylinder crank arm rupture. As shown in Figure 1a, d. 2, the crankshaft thrust pad surface ablation or wear caused by crankshaft end clearance is too large, the engine operating conditions change, causing the crankshaft axial movement, the impact of the impact of the crank arm by the end face greater. Due to stress concentration, crankshaft second cylinder crank arm fracture, as shown in Figure 1b.