共轨喷油器细长杆类零件变形及其影响

Elastic Deformation of Injector Slender Rod Part and its influence

针对典型针阀不限位结构的共轨喷油器,通过理论经典公式、有限元计算、试验分析及一维液力计算等多种方法对喷油器细长杆控制活塞受高压后的轴向变形进行研究,研究结果表明,理论计算与试验结果符合较好,控制活塞在受压力的情况下会发生轴向变形,随着压力的升高,轴向变形越大,基本呈线性变化,控制活塞的轴向变形使得针阀升程增大,喷油开启延迟和关闭延迟均增大,直接影响喷油器的喷油特性,而在设计初期的理论液力分析中未考虑此变形,是导致实际喷油特性与理论喷油特性不一致的原因之一。

This paper analysis the elastic deformations due to the high forces acting on the injector control piston, based on the typical no needle lift limit injector structure through theoretic formula Hooke＇ s law, ABAQUS software, test analysis and AMESim software. The results of calculation were similar compared with the experiment＇ s results. Control piston will cause elastic deformation because of high pressure . The deformation value will become higher as pressure is higher, and will increase linearly with the operating pressure. The effective needle lift increases because of this elastic deformation in no needle lift limit injector, and inject opening time and closing time will become longer, this will change the injection event. This event is not be considered in hydraulic analysis before, that is one of the reason why theoretic value is different with the test value.