汽油机凸轮型线改进设计

应用配气机构模拟计算软件AVL-TYCON对国内某四缸汽油机配气机构进行运动学、动力学分析.结果显示,原机配气机构存在的进、排气门升程丰满系数较低,进排气凸轮与挺柱间的最大接触应力大等不足.本文根据其不足之处,通过重新设计进、排气凸轮型线,解决了原机配气机构存在的问题,提高了配气机构的可靠性和寿命,而且提高了充气效率和发动机整机性能.

Improvement Design of Gasoline Engine Cam Profile

The widely used valve-train simulation software, AVL-TYCON, was applied to perform both kinematic and dynamic simulations for the valve-train of a four-cylinder gasoline engine. Simulation results indicate that the original valve-train has some design drawbacks,such as the plump coefficient of the intake and exhaust valve being cow,the contact stresses between cam and tappet being greater,which may lead to durability issues. The intake and exhaust cams were then redesigned via computer simulation optimization, which not only solved the primary design issues and but also improved the durability. The engine performance simulation results also indicate an improvement to the full load volumetric efficiency, which results in an increase of maximum engine power output.