【摘要】 以4缸4冲程柴油机为研究对象,考虑缸体—缸盖联结螺栓预紧力、气缸压力和活塞侧推力等机械负荷的影响,对缸套失圆进行仿真计算和分析,然后耦合冷却流场,对热负荷影响下的缸套失圆进行了模拟计算,最后耦合机械负荷和考虑冷却流场的热负荷,计算并分析了多种因素下的缸套失圆问题.结果表明,各因素对各个缸套的变形形态和具体失圆数据影响各不相同,热负荷对缸套失圆的影响更大些,其中冷却流场非均匀性的影响不容忽略,机械负荷对缸套失圆的影响稍小些,而螺栓预紧力对所有缸套的变形均具有显著影响,燃气压力和活塞侧推力只对缸套的局部区域影响较大,综合多种因素对缸套失圆进行的研究更能反映缸套在运行工况下的真实状况.更多还原

【Abstract】 The influencing factors to the roundness of cylinder liner were analyzed in a four-stroke four-cylinder engine.The mechanical influencing factors include the preload of joint bolts,gas pressure and thrust force from piston.Numerical study on the roundness of cylinder liner was made.By taking into ac-count of the effect of thermal influencing factors incorporating with cooling liquid,the deformation and distortion of cylinder liners were presented.Comprehensive distortion of cylinder liner was obtained con-sidering both mechanical load and thermal load and including cooling effect using couple method.Results indicate that thermal factors have larger influence on the shape and distortion of cylinder liner than the mechanical factors do.The cooling effect from the coolant should be considered.Meanwhile,the preload of joint bolt plays a significant role on the deformation of the whole part of all four cylinders,and gas pressure and piston thrust force only lead to the deformation and distortion of partial parts of cylinder liner.Comprehensive analysis considering multiple factors gives detailed description to cylinder liner distortion under real working condition.更多还原