柴油机连杆齿形配合面裂纹成因研究  

Formation Reasons of Cracks on Tooth-shape Contact Surface of Connecting Rod for A Diesel Engine

作　　者：徐进[1] 朱旻昊[1] 江晓禹[2] 沈永平[3] 周仲荣[1] 

机构地区：[1]西南交通大学摩擦学研究所 [2]西南交通大学力学系,四川成都610031 [3]戚墅堰机车车辆厂,江苏常州213011

出　　处：《机械工程材料》2003年第4期51-54,共4页Materials For Mechanical Engineering

基　　金：国家杰出青年基金科学基金资助项目 ( 5 972 5 5 13 ) ;铁道部科学研究开发项目 ( 2 0 0 0J0 2 5 )

摘　　要：在 16V2 80ZJ型柴油机连杆齿形配合面的动力学分析、接触应力及相对微滑位移值计算的基础上 ,对连杆材料 (调质 4 2CrMo钢 )进行了微动试验研究。结果表明 ,连杆齿形配合面间发生微动 ,并运行于微动裂纹最易形成的混合区。结合连杆裂纹故障的特征 ,分析认为连杆齿形失效的根本原因在于接触齿面间复杂的微动疲劳作用加速了裂纹的萌生与扩展 ,大大降低了连杆使用寿命 ,并提出了减缓连杆齿形配合面微动疲劳损伤的方案。Fretting tests have been performed on the connecting rod material on the basis of the analysis of dynamics, contact stress and relative displacement amplitude of contact surfaces of the connecting rod for 16V280ZJ diesel engine. The results show that fretting occurs between two tightly combined surfaces for connecting rod tooth, and in the mix regime of running condition map for connecting rod material. In combination with the typical characteristics of connecting rod failure, it is considered that the complex fretting action aggravates the initiation and propagation of tooth surface crack. At last, a program is proposed to mitigating fretting damage of tooth shape combined surfaces for connecting rod.

关 键 词：柴油机连杆 微动 微动损伤 失效分析 

分 类 号：TK423.3[动力工程及工程热物理—动力机械及工程]