汽车发动机气门机构的运动学分析

对顶置式气门机构进行了运动学分析，通过平底推杆的运动规律求得气门的升程、速度和加速度，分别给出了精确解和近似解。两种方法的计算结果基本吻合。计算结果表明，对称凸轮会得到一个不对称的气门运动规律。

Kinematic Analysis of Air Valve Unit of Motors

In this paper, kinematics of upper air valve unit is analyzed. The displacement, velocity and acceleration of air valve are calculated by accurate and approximate methods. The solutions by different methods are almost identical. It is found that the displacement, velocity and acceleration of air valve are unsymmetrical although the shape of cam is symmetrical.