顶置凸轮配气机构仿真分析

Dynamic simulation analysis of overhead camshaft valve－ train

运用多体力学的方法对配气机构进行了动态仿真分析，采用数字多体程序的方法，建立了配气系统的理论模型，进行配气机构的运动学、动力学分析，除了得到气门的升程、速度、加速度外，还考虑了摇臂与气门之间的碰撞，以及摇臂支座的柔性。因此得到气门与摇臂之间的碰撞力，摇臂支座的柔性衬套的受力，气门弹簧力，凸轮轴支座反力，气门座反力及凸轮与摇臂之间的压力角等。为凸轮型线、摇臂形状和整个配气机构的设计改进提供了重要依据。

Valve－ train has been dynamically simulated by the multi－ body method.A theory model has been built for the valve train by using the digital multi－ body program.Not only the lift height,speed and acceleration of valve but also the collision between valve and rocker and the flexibility of rocker support are taken into account.Therefore， the colliding force between valve and rocker,loading on the flexible bearing of rocker support,valve spring force,cam support counter－ force,valve ring counter－ force and direction angle of acting force between cam and rocker have been carried out.The important basis on design improvement for cam profile,rocker form and valve train have been provided.