| 某汽油机连杆断裂失效分析 |
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| 引用本文： | 邓君,王延亮.某汽油机连杆断裂失效分析[J].内燃机与配件,2020(13):29-31. |
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| 作者姓名： | 邓君 王延亮 |
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| 作者单位： | 上海汽车集团股份有限公司技术中心,上海200125;上海汽车集团股份有限公司技术中心,上海200125 |
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| 摘 要： | 某汽油机在进行断油转速试验时发生连杆断裂的失效故障。通过断口分析和逻辑推理,找到了失效原因,即连杆螺栓孔尾端存在非全螺纹,极限尺寸情况,螺栓孔的非全螺纹跟螺栓的全螺纹存在啮合的可能,非全螺纹啮合引起螺纹干涉和应力集中,从而导致连杆的疲劳断裂。改进方案通过FEA计算和试验验证,为其他连杆设计提供借鉴。
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| 关 键 词： | 断油转速 连杆断裂 非全螺纹啮合 应力集中 |
Failure Analysis of A Broken Gasoline Engine Con-rod Assembly |
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| DENG Jun,WANG Yan-Liang.Failure Analysis of A Broken Gasoline Engine Con-rod Assembly[J].Internal Combustion Engine & Parts,2020(13):29-31. |
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| Authors: | DENG Jun WANG Yan-Liang |
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| Affiliation: | (SAIC Motor Co.Ltd.,Technical Center,Shanghai 200125,China) |
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| Abstract: | A gasoline engine con-rod was broken during the cut off speed test.Through fracture analysis and logical reasoning root cause was found.Incomplete thread existed in con-rod bolt hole.Under limit-situation the incomplete thread interfered with the full thread of the bolt which caused stress concentration and led to the fatigue failure of the con-rod.The improved design passed the FEA calculation and dyno-tests.This case can be referenced for other con-rod design. |
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| Keywords: | cut off speed con-rod assembly broken incomplete thread engagement stress concentration |
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