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Failure Analysis of a 1990 Mazda Miata Crankshaft and Timing Pulley Bolt

机译:1990年马自达Miata曲轴和正时皮带轮螺栓的失效分析

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摘要

A Mazda Miata crankshaft and timing belt pulley bolt failed in service. This caused extensive damage to the engine. The crankshaft and bolt were analyzed to determine the cause of failure. Using visual examination and other means, it was determined that the crankshaft and bolt failed by fatigue. The crankshaft failure initiated at the keyway, while the timing belt pulley bolt initiated in the threads. Inadequate clamping force during installation of the timing belt pulley bolt is thought to have initiated failure.
机译:马自达Miata曲轴和正时皮带轮螺栓在维修中失败。这对发动机造成了广泛的损害。分析了曲轴和螺栓以确定故障原因。通过目视检查和其他手段,确定曲轴和螺栓由于疲劳而失效。曲轴故障在键槽处引发,而同步皮带轮螺栓在螺纹处引发。在安装同步皮带轮螺栓时,夹紧力不足被认为是引发故障的原因。

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