重型汽车骑马螺栓断裂分析 |
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引用本文: | 徐萍,白培谦.重型汽车骑马螺栓断裂分析[J].汽车实用技术,2013(10):74-76. |
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作者姓名: | 徐萍 白培谦 |
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作者单位: | 陕西重型汽车有限公司,陕西西安710200 |
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摘 要: | 本文采用组织分析、扫描电镜断口及化学分析,对重型汽车骑马螺栓断裂原因进行分析,结果表明在车辆使用中,由于骑马螺栓拧紧力矩减小引起板簧侧向窜动,对骑马螺栓产生多次小能量冲击,形成附加弯矩,同时在螺栓热处理过程中表面贫碳降低表面的疲劳强度,最终发生弯曲疲劳断裂.
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关 键 词: | 骑马螺栓 板簧松动 疲劳断裂 附加弯矩 |
The analysis of facture of the U-bolt in the heavy truck |
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Authors: | Xu Ping Bai Peiqian |
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Institution: | (Shanxi Heavy Automobile Co.LTD, Shaanxi Xi'an 710200) |
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Abstract: | The facture of the U-bolt in the heavy truck was researched by microstructure, SEM and chemical analysis. The result showed that the tightening torque loss in U-bolt caused the lateral movement of leaf spring, which produced frequent small energy impact and additional bending moment to U-bolto Also, the carbon depleted surface after heat treatment reduced the fatigue strength of the surface, leaded to ultimate bending fatigue fracture. |
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Keywords: | U-bolt Leaf spring loose Fatigue fracture Additional bending moment |
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