| 摘要:针对某型船用柴油机配气凸轮机构凸轮副接触疲劳失效，从生产、加工质量着手，采用化学成分及机械性能分析、硬度检测、电镜扫描等手段排查材料是否存在缺陷；基于设计仿真分析凸轮滚轮的接触应力以及影响因素。结果表明:挺柱体导向块间隙过大，改变了凸轮与滚轮的接触状态，使其接触应力超过材料的疲劳极限是导致凸轮副疲劳失效的根本原因。 |
| 关键词: 凸轮副 疲劳失效 接触应力 挺柱 |
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| Contact Fatigue Failure Analysis on the Cam-Pair of a Diesel Engine |
| Chen Yibo,Tu Danhong,Song Yali |
| China Shipbuilding Power Engineering Institute Co., Ltd., Shanghai 200120 |
| Abstract:Aiming at the contact fatigue failure of the cam-pair of a diesel engine′s valve cam mechanism, focusing on its processing quality, inspections were carried out with the analysis of chemical composition and mechanical performance, hardness measurement, and electron microscope scanning to judge if the material has flaws. Simulation analysis was carried out to study the contract stress of the cam and the roller and its influence factors. The results showed that the guide block of the tappet had excessive clearance, which changed the contact status of the cam and the roller, thus made its contact stress go beyond the fatigue limitation of this material, which was the main reason for fatigue failure of cam-pair. |
| Key words: cam-pair fatigue failure contact stress tappet |
