内燃机与配件www.nrjpj.cn基于径向滑移传播理论的新型防松结构设计彭阳(博世汽车部件(长沙)有限公司项目部,湖南长沙410100)摘要:螺栓接头在振动环境下容易发生自松动,并可能引起螺栓疲劳断裂,造成严重后果。明确螺纹的自松机理,在此基础上开发新型防松螺纹结构是十分必要的。径向滑移传播理论为自松动过程提供了新的见解,该理论指出沿螺纹表面径向方向的滑移引起了更多的滑移区域(滑移传播),并且随着振动循环次数的增加,螺纹和轴承表面接触状态的动态演变和传播导致了自松动的发生。因此,基于径向滑移传播理论提出了一种新型的防松结构———阶梯螺纹啮合螺栓接头,该接头可以防止外螺纹和内螺纹在径向上发生相对运动,从而阻止滑移的传播。实验验证了改新型防松结构优异的防松、抗疲劳性能,且安装拆卸方便。关键词:螺栓连接;径向滑移传播理论;防松结构中图分类号:U463文献标识码:A文章编号:1674-957X(2023)08-0007-03DesignofNovelAnti-looseningStructuresBasedonTheRadialSlippagePropagationTheoryPengYang(BoschAutomotiveProducts(Changsha)Co.,Ltd,HunanChangsha410100)Abstract:Boltedjointsarepronetoself-looseninginthevibrationenvironmentandmaycauseboltfatiguefracturewithcatastrophicconsequences.Itisessentialtoclarifytheself-looseningmechanismandonthisbasistodevelopanovelanti-looseningthreadstructure.Thetheoryofradialslippagepropagationprovidesnewin-sightsintotheprocessofself-loosening.Thistheorypointsoutthattheslippagealongtheradialdirectionofthethreadsurfaceinducesmoreslippageareas(slippagepropagation),andself-looseningoccursduetothedynamicevolutionandpropagationofcontactstatesonthethreadandbearingsurfaceswithanincreaseinthenumberofvibrationcycles.Therefore,anovelboltedjointwithstepthreadengagementwasdevelopedbasedontheradialslippagepropagationtheory,whichcouldpreventtheoccurrenceofrelativemotionoftheexternalandinternalthreadsintheradialdirectionandthusblockslippagepropagation.Experimentsvalidateditssuperioranti-loose-ningandanti-fatigueperformances,andtheconvenienceofinstallationandremoval.Keywords:Boltedjoint;Radialslippagepropagationtheory;Anti-looseningstructures作者简介:彭阳(1983—),女,湖南长沙人,本科学历,中级工程师,研究方向机械设计...
