基于弯曲疲劳试验的发动机曲轴疲劳试验设计探讨  

Exploration of Fatigue Test Design for Engine Crankshaft Based on Bending Fatigue Test

作　　者：唐晋 昝雪松 Tang Jin;Zan Xue-song(Hubei Industrial Polytechnic,Hubei Shiyan 442000)

机构地区：[1]湖北工业职业技术学院,湖北十堰442000

出　　处：《内燃机与配件》2024年第13期49-51,共3页Internal Combustion Engine & Parts

摘　　要：为了提高发动机曲轴部件工作的稳定性与可靠性,对某汽车发动机曲轴为试验对象,将其分成多个单拐试样,分别使用电磁谐振加载法与电液伺服加载法进行弯曲疲劳试验。试验结果表明,电液伺服加载法对弯矩的控制更为合理、精准;电磁谐振加载法可以有效缩短试验时间,减小试验成本;不同试验方法下获得的疲劳极限值并不相同,要结合曲轴试验目的选取适宜的试验方法;两种试验方式下曲轴失效形式均是连杆颈辊压槽处出现断裂。由此可以得出:两种加载方式得到的疲劳极限数值偏差幅度为4.4%;发动机曲轴部件中最为薄弱的部分在连杆颈辊压槽处。In order to improve the stability and reliability of the engine crankshaft components,a certain automobile engine crankshaft was taken as the test object,and it was divided into multiple single crank specimens.The electromagnetic resonance loading method and the electro-hydraulic servo loading method were respectively used for bending fatigue testing.The experimental results show that the electro-hydraulic servo loading method has a more reasonable and accurate control of bending moment;The electromagnetic resonance loading method can effectively shorten the testing time and reduce the testing cost;The fatigue limit values obtained under different testing methods are not the same,and a suitable testing method should be selected based on the purpose of crankshaft testing;The failure mode of the crankshaft under both test methods is fracture at the roller groove of the connecting rod neck.From this,it can be concluded that the deviation amplitude of the fatigue limit values obtained by the two loading methods is 4.4%;The weakest part of the engine crankshaft components is at the roller groove of the connecting rod journal.

关 键 词：弯曲疲劳试验 发动机 曲轴 电磁谐振加载法 电液伺服加载法 

分 类 号：U464.133.3[机械工程—车辆工程]