某四缸汽油机气缸盖气缸体组合结构有限元分析

Finite Element Analysis of the Combination Structures for Cylinder Head and Block of A Four-cylinder Gasoline Engine

建立了某四缸汽油机气缸盖、缸体、主轴承盖等零件的三维有限元组合模型。使用有限元分析软件Abaqus,在考虑各组件非线性接触关系的基础上,计算了该组合体在标定工况下的振动响应。对该发动机进行了表面振动测量,通过振动测点处实验数据与该点处计算数据的对比验证了有限元模型建立的合理性。分析了爆发工况下缸体、缸盖火力面及缸孔的振动变形。结果表明:缸体裙部刚度较弱容易产生变形;缸盖火力面鼻梁区变形较大,缸盖火力面与气缸盖连接处容易产生较大的应力;缸孔的变形量较小在工程允许的范围之内。

The integrating finite model for cylinder head,cylinder block and main bearing cap was established,the nonlinear contact boundary conditions were employed by using Abaqus software. The vibration response of the assembly under the rated speed was calculated,and the computed results were compared with the testing results. It shows that the finite model is rational. The deformation of cylinder block,cylinder head fire surface and cylinder hole was analyzed at the maximum firing pressure. The results show that the stiffness of cylinder body skirt is small; the deformation of the central area of cylinder head fire surface is large,the stress in the connection region between cylinder head fire surface and cylinder head is large; the deformation of cylinder hole is small and in engineering allowance.