内燃机配气机构传动链脱节概率

以某型发动机配气机构传动链为研究对象,应用随机摄动和概率可靠性等分析方法,建立了配气机构脱节概率可靠性数学模型.当配气机构基本随机变量为正态分布时,提出了传动链脱节的可靠性分析方法.通过算例分析获得了凸轮在不同运动阶段的传动链脱节概率,以及在不同转速下的脱节失效概率,并且随着转速升高传动链发生脱节的概率也会升高,与实际情况相符合,进一步表明了所提方法的正确性.此外,通过分析脱节的原因,提出了为降低脱节概率而应采取的方法,为今后内燃机配气机构传动链的可靠性设计提供了理论依据.

Disjoint Probability of Transmission Chain in Engine Valve Train

Based on the research of certain transmission chain in gas engine valve train， a probabilistic reliability mathematical model of the disconnection of valve train was established with the method of the stochastic perturbation and probabilistic reliability. A transmission chain disjointed reliability analysis method was proposed when the valve mechanism random variables belong to normal distribution. The disjoint probabilities in different sensorimotor stage and different speed were obtained by numerical examples. The disjoint probability increases with the increase of speed， which is consistent with actual situation， and shows the correctness of the as-proposed method. A solution was proposed to reduce the disjoint probability by analyzing the reasons for disconnection， which provide a theoretical basis to improve the follow-up reliability design about engine valve transmission chain.