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ＹＺ１４Ｂ振动压路机已成为我公司的主导产品。随着该产品在道路工程中的广泛使用，亦相应出现了一些质量问题，如变速器二轴六角螺母（见图１）在随二轴一起旋转的过程中易脱落，掉人工作腔内后造成该壳体破裂，同时变速器内部零件也受到损坏。１．事故原因分析（ｌ）二轴上
YZ14B Vibration roller has become my company’s leading product. As the product is widely used in road engineering, some quality problems have appeared correspondingly. For example, the two-shaft hexagonal nut of the transmission (see FIG. 1) is easy to fall off during rotation with the two shafts, The housing is broken and the internal parts of the transmission are also damaged. 1. Analysis of the cause of the accident (l) on the two axes