单孔轴针式喷油器在工作中,有少量柴油从针阀导向部的间隙中泄漏,经挺杆导向部上升,由回油孔流出,随着磨损加重,间隙增大,回油量越来越多,这属正常现象。但是笔者曾遇到过一次罕见的故障,即回油量突然大增,甚至只回油不喷油,直到把调压螺钉拧得很松,才喷一点油。起初认为是针阀卡死,或针阀与导向孔磨损过重,或喷油器体与喷油嘴固定不紧等原因造成的。但经检查分析,这些情况都不存在。 Single-hole axial needle injectors in the work, a small amount of diesel leaks from the needle valve guide gap, the tappet guide rises from the oil return hole outflow, as wear increases, the gap increases, the amount of oil back More and more, this is normal. But I have encountered a rare failure, that a sudden surge in oil return, or even return to the oil is not injected until the pressure screw is screwed loose, before spraying a little oil. Initially that the needle stuck, or needle and guide hole wear too heavy, or injector body and injector fixed not tight and other causes. However, after examination and analysis, these situations do not exist.