公开(公告)号：US5323964A

公开(公告)日：1994-06-28

申请号：US861005

申请日：1992-03-31

申请人： Bela Doszpoly ,  Laszlo Tikk ,  Yul Tarr ,  Leonard Hummel

发明人： Bela Doszpoly ,  Laszlo Tikk ,  Yul Tarr ,  Leonard Hummel

IPC分类号： F02M45/08 ,  F02M57/02 ,  F02M59/30 ,  F02M63/04

CPC分类号： F02M57/02 ,  F02M59/30

摘要： A fuel injector includes an injector housing having a plunger assembly disposed within a central axial bore and including a lower plunger, an intermediate plunger, and an upper plunger. The lower plunger reciprocates within the central bore to meter a variable quantity of fuel and to inject this fuel during downward portions of the reciprocating motion. A timing chamber formed between the upper and intermediate plungers receives an amount of timing fluid to create a variable length hydraulic link between the plungers. The fluid is drained from the chamber through a drain passage at the end of the injection cycle. The timing chamber has associated with it a mechanism for changing the effective flow function of the drain passage, at a point in the cycle following fuel injection, to maintain a large downward pressure on the lower plunger to hold the lower plunger down and thus prevent additional, undesired fuel flow into the combustion chamber. In a preferred embodiment, the drain passage is located along the central axis of the intermediate plunger, and the upper plunger is provided with a projecting portion which moves into position as the timing chamber collapses to effectively constrict the drain passage, thus changing the timing fluid flow function to a function which provides greater fluid pressure in the timing chamber.

摘要翻译： 燃料喷射器包括具有设置在中心轴向孔内并包括下柱塞，中间柱塞和上柱塞的柱塞组件的喷射器壳体。 下部柱塞在中心孔内往复运动以计量可变量的燃料并且在往复运动的向下部分期间喷射该燃料。 形成在上部和中间柱塞之间的定时室接收一定量的定时流体以在柱塞之间产生可变长度的液压连杆。 在注射循环结束时，流体通过排水通道从腔室中排出。 正时室与其相关联地具有用于在燃料喷射之后的循环中的点处改变排水通道的有效流动功能的机构，以在下部柱塞上保持较大的向下压力以将下部柱塞向下保持，从而防止额外的 ，不期望的燃料流入燃烧室。 在优选实施例中，排水通道沿着中间柱塞的中心轴线定位，并且上柱塞设置有突出部分，该突出部分随着定时室塌陷而移动到位以有效地收缩排水通道，从而改变正时流体 流动功能到在定时室中提供较大流体压力的功能。