While valve gear is drove by valve cam and its performance is decided by the shape and structure of cam . so the design of valve cam has great effect to the performance of internal combustion engine 而整个配气机构是由配气凸轮驱动的，配气机构的性能在很大程度上取决于配气凸轮的形状和结构，因此配气凸轮设计的好坏对整个内燃机的性能有重要影响。
