我公司有一台俄罗斯产T-170型推土机，使用不久就发生了发动机气缸套沿上台肩横向断裂的故障。通过分析，我们认为断裂的原因有三个：所用材质中含有杂质；铸造中产生缩孔缩松等缺陷；局部结构设计不合理，台肩处过渡突然，形成较大的应力集中。鉴于此，我们决定改进结构、选用 Our company has a Russian-made T-170 bulldozer, and soon after it was used, there was a fault in the transverse rupture of the engine cylinder liner along the upper shoulder. Through analysis, we believe that there are three causes of fracture: materials used contain impurities; shrinkage shrinkage and other defects occur in casting; local structure design is not reasonable, the sudden transition at the shoulder, forming a large stress concentration. In view of this, we decided to improve the structure and use