机械科学与技术2017，Vol.36Issue(12)：1941-1948,8.DOI:10.13433/j.cnki.1003-8728.2017.1222
CNG发动机活塞热-机耦合应力分析
Thermo-mechanical Coupling Stress Analysis of CNG Engine Piston
摘要
Abstract
As the compressed natural gas (CNG) engine moves toward the direction of high speed and high power development,the piston pin hole stress is greater,causing fatigue crack on the piston pin hole.Therefore,we design the new structure of an arc surface bush piston pin hole.Such piston bush is derived from the movement analysis and assembly conditions analysis.The stress distribution state of the piston under different load conditions of mechanical load and thermo-mechanical coupling load were analyzed with the finite element method.Simulation results show that the Mises stress of the new structured piston bush decreases by 25.3％,that the Mises stress of the new structured piston pin hole decreases by 27.9％ compared with the original structured piston and that its contact stress decreases by 35.4％ under the mechanical load.The analysis results on the piston stress state of the thermomechanical coupled load are similar to those on the mechanical load.In addition,the piston's stress state has been greatly improved.The stress distribution of the piston pin hole with an arc surface bush is more homogeneous;it is easier to form oil film on the arc surface bush.Therefore,the new structure of the piston pin hole with arc surface bush has strong capability of decreasing stress and increasing the lubricity and anti-wear ability.关键词
CNG发动机/活塞/弧面衬套/结构设计/耦合分析/应力Key words
CNG engine/piston/arc surface bush/structural design/coupling stress analysis/stresses分类
能源科技引用本文复制引用
陈洋,何畏,贺军超,熊尉伶,杨志勇,张自立..CNG发动机活塞热-机耦合应力分析[J].机械科学与技术,2017,36(12):1941-1948,8.基金项目
四川省科技支撑计划项目(2015GZ0159)资助 （2015GZ0159）
