摘要
为提高双进双排气门的使用寿命,以气门-导管间隙ΔD为特征变量,采用有限元法分析ΔD、锥面角β对气门应力特性的影响,并探讨了在异常工况下双进双排气门的许用ΔD。研究表明:当ΔD≤0.22 mm时,最大应力及第二热点应力变化较稳定,而当ΔD>0.22 mm时,其随ΔD增大而急剧增大;此外,当ΔD=0.22mm时,最大表面应力随β的增加而增大,而第二热点应力随β的增加呈现先减小后增大趋势,且β=45°时,气门第二热点应力最小。研究有助于异常工况下双进双排气门的失效分析和气门结构的优化设计。
In order to improve the life of the double intake-exhaust valve,the effect of the valve-valve guide gaps（ΔD） and cone angles（β） on the stress characteristics of the valve were analyzed and the allowable ΔD was also investigated under abnormal working conditions by taking ΔD as the characteristic variable and using finite element method.The research results show that when ΔD is smaller than 0.22 mm,the maximum stress and the second hot spot stress present a stable value,whereas,when ΔD is beyond 0.22 mm,the stresses above sharply increase with the increase of ΔD.Furthermore,when ΔD is 0.22 mm,the maximum stress increases while the second hot spot stress firstly decreases then increases with the increase of β,meanwhile,when β is 45°,the second hot spot stress is the smallest.The research is useful to the failure analysis of the double intake-exhaust valve in abnormal working conditions and its structural optimization design.
出处
《武汉理工大学学报（信息与管理工程版）》
CAS
2011年第5期754-757,共4页
Journal of Wuhan University of Technology：Information & Management Engineering
基金
国家发改委科学研究基金资助项目(2004-024-28)
关键词
异常工况
双进双排气门
热点应力
气门-导管间隙
abnormal working conditions
double intake-exhaust valve
hot spot stress
valve-valve guide gap
