公开(公告)号：US5163621A

公开(公告)日：1992-11-17

申请号：US624104

申请日：1990-12-10

申请人： Masaaki Kato ,  Hiroyuki Kano ,  Masahiro Okajima ,  Yoshihiro Narahara ,  Tertada Kojima ,  Shigeki Tojo

发明人： Masaaki Kato ,  Hiroyuki Kano ,  Masahiro Okajima ,  Yoshihiro Narahara ,  Tertada Kojima ,  Shigeki Tojo

IPC分类号： F02M61/10 ,  F02M61/16 ,  F02M61/18

CPC分类号： F02M61/1813 ,  F02M61/163 ,  F02M61/18 ,  F02M61/1833 ,  F02M61/1846

摘要： A fuel injection valve of a diesel engine, comprising a valve body including a concave conical surface in the tip portion of the valve body, and fuel injection holes extending from the concave surface to the outside of the valve body, and a needle valve movable in the valve body and including a cylindrical shaft portion, a first conical surface adjacent to the shaft portion and having a conical angle smaller than that of the concave surface, the lower edge of the first conical surface defining a contact line separably contacting with the concave surface, a second conical surface adjacent to the first surface and having a conical angle substantially equal to that of the concave surface, a third conical surface adjacent to the second surface and having a conical angle greater than that of the concave surface. In case of a smaller lift amount of the needle valve, the fuel flow speed flowing into the fuel injection hole is fast and the atomized fuel injection divergence angle from the injection hole is great, thereby producing active producing mixing of the fuel with the air and enhancing the ignition feature, while in case of a greater lift amount, the fuel flow speed is slow and the atomized fuel injection divergence angle from the injection hole is small, thereby increasing the fuel flow reach and producing an active mixing of the fuel with the air by virtue of the kinetic energy of the atomized fuel flow.

摘要翻译： 一种柴油发动机的燃料喷射阀，包括阀体，该阀体包括在阀体的顶端部分中的凹形锥形表面，以及从阀体的凹面向外部延伸的燃料喷射孔， 所述阀体包括圆柱形轴部分，与所述轴部分相邻并且具有比所述凹形表面小的圆锥角的第一锥形表面，所述第一锥形表面的下边缘限定与所述凹面可分离地接触的接触线 与所述第一表面相邻并且具有基本上等于所述凹表面的圆锥角的第二锥形表面，与所述第二表面相邻并且具有大于所述凹面的圆锥角的锥形角。 在针阀的提升量较小的情况下，流入燃料喷射孔的燃料流速快，并且来自喷射孔的雾化燃料喷射发散角大，从而产生燃料与空气的主动产生混合， 提高点火特征，而在提升量较大的情况下，燃料流速变慢，喷射孔的雾化燃料喷射发散角小，从而增加燃料流量到达并产生燃料与主燃料的主动混合 借助于雾化燃料流的动能，空气。