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我厂生产的4115柴油机在保用期内和超保用期中,曲轴早期疲劳折断时有发生。曲轴断裂多是通过主轴颈和连杆轴颈圆角部位并沿曲柄臂处折断,断口有明显疲劳特征,有疲劳断裂区和普通断裂区。对整根曲轴来说折断部位多发生在邻近二、四主轴承的曲柄臂处。一般多在一处折断,个别也有二处折断即曲轴折断为三截。
The 4115 diesel engine produced by our factory during the warranty period and the period of super-guarantee, the crankshaft early fatigue fracture occurred from time to time. Crankshaft fracture is mostly through the main journal and connecting rod fillet parts and along the crank arm at the fracture, the fracture has obvious fatigue characteristics, fatigue fracture zone and the general fault zone. For the entire root of the crankshaft fracture occurred in the vicinity of two or four main bearing crank arm. Generally more than one break, there are also two separate break that crankshaft broken for three.