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Failure investigation of a truck diesel engine gear train consisting of crankshaft and camshaft gears

机译:包含曲轴和凸轮轴齿轮的卡车柴油发动机齿轮系的故障调查

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摘要

A failure investigation has been conducted on a diesel engine gear train consisting of a drive crankshaft and a driven camshaft gears that were used in a truck. The gears are made from a nitrided 42CrMo steel. Adjacent teeth fracture regions appeared on the gears after a service of 4.2 X 10~4 km. Fractographic features indicate that multiple origins fatigue fracture was the dominant failure mechanism for the gear teeth. The crankshaft gear fracture first, followed by the camshaft gear. Low hardness in subsurface and core region of the nitrided crankshaft gear makes it difficult for the matrix to support the load by the engaged camshaft gear to lead to initiating the fatigue crack at the root fillet bearing the maximum tensile stress. The crankshaft gear is the component causing trouble for the failed gears train.
机译:已经对柴油发动机齿轮系进行了故障调查,该齿轮系由卡车中使用的驱动曲轴和从动凸轮轴齿轮组成。齿轮由氮化的42CrMo钢制成。经过4.2 X 10〜4 km的磨合后,齿轮上出现了相邻的牙齿断裂区域。分形特征表明,多源疲劳断裂是齿轮齿的主要失效机理。曲轴齿轮先断裂,然后凸轮轴齿轮断裂。渗氮曲轴齿轮的表面和下部区域的硬度较低,使得基体难以通过啮合的凸轮轴齿轮支撑负载,从而导致在承受最大拉应力的根部圆角处引发疲劳裂纹。曲轴齿轮是导致齿轮系故障的组件。

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