发动机配气机构刚柔耦合动力学特性研究

A Research on Rigid-flexible Coupling Dynamics of Engine Valve-train

基于三维实体模型,运用刚柔耦合理论,把摇臂视为柔性体,采用动态子结构法,建立了某顶置气门发动机配气机构凸轮轴—摇臂—气门系统三维刚柔耦合动力学模型,对其动态特性进行了仿真,得出气门的动力学响应、摇臂动态应力等变化规律。结果表明该发动机配气机构气门升程曲线连续光滑,凸轮与摇臂工作接触过程中无脱离现象发生。

Based on 3D solid model, applying the theory of rigid-flexible coupling dynamics, taking rocker ann as flexible body,and using dynamic substructure method, a 3D Rigid-flexible Coupling Dynamics Model for the camshaft-rocker-valve system of a overhead valve engine is established. A simulation on its dynamic characteristic is carried out, with the dynamics response of Valve system and the changing rule of rocker arm dynamic stress ob- tained. The results show that the valve lift curve is continuous and smooth and the cam and rocker arm keep proper contact throughout the whole working process.