某汽油发动机凸轮轴凸轮异常磨损分析及改进

Analysis and Improvement of Cam Abnormal Wear in a Gasoline Engine Camshaft

某汽油发动机在研发初期出现凸轮轴凸轮异常磨损现象,本文从凸轮与挺柱的接触应力、凸轮与挺柱硬度、凸轮润滑、挺柱导向方面进行分析,发现凸轮润滑不良和挺柱导向不足是造成异常磨损的原因;针对上述问题优化凸轮轴供油油路和缸盖挺柱导向孔,经试验验证改进措施有效,凸轮异常磨损现象得以消除。

Cam abnormal wear appeared in a gasoline engine eamshaft during initial development stage, this paper analyses the problem from contact toree between cam and tappet, hardness of cam and tappet, cam lubrication and tappet guide, it finds that lack of earn lubrieation and shortage of tappet guide length are reasons of abnormal wear. According to above mentioned reasons oil supply circuit and tappet guide hole of cylinder head are optimized. The improvements are effective after test validation and earn abnormal wear disappears.