摘要
分析了一台摩托车配气机构出现严重磨损的原因。研究发现对于高速配气机构,在设计时如果为了防止高速出现飞脱反跳而提高弹簧预紧力将可能导致低速下接触应力超过限值。针对小型配气机构气门质量较小的特点进行了配气机构的试验。在试验测试时对比了传统的增加附加质量测量和光学非接触测量的方案,证明了采用高精度光学测量更加有利于获得准确的气门运动规律;分析了原配气机构的改进方法,提出了采用滚子摇臂的改进方案并设计了新的凸轮型线;分析了改进系统的性能,最后进行了改进前后发动机的整机试验。试验结果表明:新设计的滚子摇臂方案提高了许用应力,解决了磨损问题。
The cause of severe wear of a motorcycle valve train was analyzed in this paper. It is found that contact stress may exceed its limited value at lower speed if the spring preload of a high-speed valve train is increased for avoiding flying-away and rebound at higher speed. The experimental comparison of traditional additive mass measurement and optical non-contact measurement was performed. The experiment for a mini-valve train shows that an exact motion history of valve can be obtained by using accurate optical calibration system. A roller rocker and a new valve-train cam were designed on the basis of the original valve train. Analysis and testing results of the new system show that the allowable stress can be increased and wear problems can be solved.
出处
《内燃机工程》
EI
CAS
CSCD
北大核心
2008年第4期51-54,共4页
Chinese Internal Combustion Engine Engineering
