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    Unit injector with hard stop timing plunger
    3.
    发明授权
    Unit injector with hard stop timing plunger 失效
    单元喷油器具有硬停止定时柱塞

    公开(公告)号：US5894991A

    公开(公告)日：1999-04-20

    申请号：US916267

    申请日：1997-08-22

    申请人： Steven D. Edwards ,  Dan K. Vetters ,  Dan K. Hickey ,  George L. Muntean ,  Ray J. Amlung ,  Jeffrey L. Campbell

    发明人： Steven D. Edwards ,  Dan K. Vetters ,  Dan K. Hickey ,  George L. Muntean ,  Ray J. Amlung ,  Jeffrey L. Campbell

    IPC分类号： F02M55/04 ,  F02M57/02 ,  F02M59/32 ,  F02M63/00 ,  F02M45/00 ,  F02M47/02

    CPC分类号： F02M57/024 ,  F02M55/04 ,  F02M57/021 ,  F02M59/32 ,  F02M2200/304

    摘要： An improved cam operated, open nozzle, unit injector is disclosed including an injector body formed by a barrel, spring housing, and nozzle and containing a central bore for receiving a variable length plunger assembly mounted for reciprocal movement within the injector body wherein the variable length plunger is formed by an outer plunger and inner plunger combined with a timing plunger, mounted between the inner and outer plungers to form a collapsible timing chamber into which a variable quantity of fuel may be metered and expelled on a cycle by cycle basis to provide a variable effective length to the plunger assembly to cause controlled variation in injection timing based on variation in the timing fluid supplied to the injector and wherein the timing plunger is provided with a radial flange for engaging a stop formed in the injector barrel to hold the timing plunger in a predetermined precise location during metering of timing fluid into the collapsible timing chamber and to render the injector timing insensitive to unpredictable pressure variations. The disclosed injector may include a damping chamber for receiving the radial flange of the plunger to eliminate damaging engagement between the timing plunger and the injector barrel. Improved fuel flow passages, check valves and an improved coupling between the outer plunger and the injector's outer return spring are provided along with means for easily changing the rated injection quantity of the disclosed injector.

    摘要翻译： 公开了一种改进的凸轮操作的开口喷嘴单元喷射器，其包括由筒体，弹簧壳体和喷嘴形成的喷射器主体，并且包含用于接收安装成用于在喷射器主体内往复运动的可变长度柱塞组件的中心孔，其中可变长度 活塞由外柱塞和内柱塞组成，内柱塞与定时柱塞组合，安装在内柱塞和外柱塞之间以形成可折叠的定时室，可变量的燃料可以逐周期地计量并排出，以提供一个 可变有效长度到柱塞组件，以根据供应给喷射器的定时流体的变化引起喷射正时的受控变化，并且其中定时柱塞设置有径向凸缘，用于接合形成在喷射器筒中的止动件，以保持定时柱塞 在计量定时流体进入可折叠定时室期间的预定精确位置 呃注射器时间对不可预测的压力变化不敏感。 所公开的喷射器可以包括用于接收柱塞的径向凸缘的阻尼室，以消除定时柱塞和喷射器筒之间的有害接合。 提供了改进的燃料流通道，止回阀以及外部柱塞和喷射器的外部复位弹簧之间的改进的联接以及用于容易地改变所公开的喷射器的额定喷射量的装置。