一台采用斯太尔WD615型柴油机的自卸汽车在使用了近一年时间后出现异响,拆检发现,油底壳有较多的金属磨屑, Ⅳ缸连杆瓦严重损坏,曲轴连杆轴颈磨损严重,拆下曲轴后测量,Ⅳ缸连杆轴颈最大磨损量达0．85mm,同时沿轴向出现锥度。由于不便修复,最后只得更换了曲轴。经分析,造成这种情况可能有两方面的原因:一是该道轴瓦质量有问题:二是因机械杂质或连杆弯曲所致。下面就曲轴轴颈与轴承的磨损规律进行简要分析。 A Taiwan Steyr WD615 diesel dump truck used in nearly a year after the occurrence of abnormal sound, disassembled found that the oil pan has more metal debris, Ⅳ cylinder connecting rod is severely damaged, the crankshaft with Rod shaft wear serious, measured after removing the crankshaft, Ⅳ cylinder connecting rod journal maximum wear of 0.85mm, along the axial taper. Due to inconvenience to repair, finally had to replace the crankshaft. After analysis, resulting in this situation may have two reasons: First, the road bearing quality problems: the second is due to mechanical impurities or connecting rod bending caused. The following crankshaft journal and bearing wear rules for a brief analysis.