某四缸汽油机缸体螺纹滑扣失效分析

摘要

针对缸体主轴承盖螺栓螺纹在试验和装配过程中出现滑扣，对导致此现象的原因进行分析。主要从缸体螺纹设计、加工、缸体铸造质量、螺栓设计、螺栓加工等方面进行详细分析，结果表明，主要原因为缸体螺纹加工工艺选择不合适、螺栓旋合长度偏小、螺栓结构设计不合理和初始力矩选择不合适。%This paper presents the slippery buck le in view of the cylinder body main bearing cap bolt thread in the experiment and the assembly process, to causes this phenomenon the reason to carry on the analysis. Mainly from cylinder body aspects and so on thread design, processing, cylinder body castability, bolt design, bolt processing carries on the multianalysis, finally indicated:The primary cause for the cylinder body thread machining craft choice inappropriate, the bolt turns on lathe gathers the length to be small, the bolt structural design unreasonable and the initial moment of force choice is inappropriate.