关键词: 配气机构, 顶置凸轮, 气门理论运动函数, 进气性能

Abstract: When designing valve-train cam on OHC, the desirable configuration of the acceleration curve could be obtained by setting the maximum velocity and the maximum acceleration to the expected position, which can result in the increase of fullness coefficient of the valve lift. Then, the valve movement function was transformed into corresponding cam lift data according to the geometric transmission relationship between the valve and the cam. The cam design and test demonstrate that the designing method is feasible and the new designed valve system can improve the intake performance of the engine.

Key words: valve train, overhead cam, valve theoretic movement function, inlet performance