초록 ▼

An injection for injecting fuel under high pressure in a combustion chamber of an internal combustion engine has a control chamber, a valve body which is pressure loaded from the control chamber, a further control chamber, a nozzle needle which is pressure loaded from the further control chamber, a

An injection for injecting fuel under high pressure in a combustion chamber of an internal combustion engine has a control chamber, a valve body which is pressure loaded from the control chamber, a further control chamber, a nozzle needle which is pressure loaded from the further control chamber, a nozzle inlet, a nozzle chamber provided for the nozzle needle and loaded from the nozzle inlet, a valve body formed as a 3/2-way valve for pressure controlling the injector, a 2/2-way valve for stroke controlling of the injector at a leakage oil side, and a common controller, the valves being controllable either by the common controller or separately from one another.

대표청구항 ▼

1. An injection for injecting fuel under high pressure in a combustion chamber of an internal combustion engine, comprising means forming a control chamber; a valve body which is pressure loaded from said control chamber; means forming a further control chamber; a nozzle needle which is pressure loa

1. An injection for injecting fuel under high pressure in a combustion chamber of an internal combustion engine, comprising means forming a control chamber; a valve body which is pressure loaded from said control chamber; means forming a further control chamber; a nozzle needle which is pressure loaded from said further control chamber; a nozzle inlet; a nozzle chamber provided for said nozzle needle and loaded from said nozzle inlet; a valve body formed as a 3/2-way valve for pressure controlling the injector; a 2/2-way valve for stroke controlling of the injector at a leakage oil side; and a common controller, said valves being controllable either by said common controller or separately from one another. 2. An injection as defined in claim 1, wherein said valve body has an inlet throttle element through which said first-mentioned control chamber is connected permanently with an inlet from a high pressure collecting chamber. 3. An injection as defined in claim 1, wherein said valve body has slider portions which are provided with a control edge for controlling a high pressure. 4. An injection as defined in claim 1; and further comprising an injector housing provided with a seat for said valve body, and an opening which communicates with a pressure-releasing control chamber and acts on a nozzle needle piston. 5. An injection as defined in claim 1; and further comprising a supply throttle element integrated in an inlet to said further control chamber in said injector housing. 6. An injection as defined in claim 1; and further comprising a pressure element acted by said controller which is common for said pressure part and said stroke part for acting on a closure element and providing a maximum stroke path of a pressure rod coupled with said pressure element. 7. An injection as defined in claim 1, wherein said further control chamber is pressure relieved by controlling a closing element when said common controller has a greater stroke path than a stroke path of a pressure rod, so as to pressure control the injector. 8. An injection as defined in claim 1, wherein a closure element is closed when said common controller provides a smaller stroke path of a pressure element than a predetermined stroke path, so as to control the injector in a stroke-controlled manner. 9. An injection as defined in claim 1, wherein said common controller is a piezoactuator. 10. An injection as defined in claim 1, wherein said valve body has a slider portion formed so that during a partial closing of said valve body via said slider portion said further chamber is acted with a high pressure and a closure piston loads said nozzle needle. 11. An injection as defined in claim 1; and further comprising an outlet throttle providing a pressure relief of said further control chamber. 12. An injection as defined in claim 1, wherein said valve body which acts as a 3/2-way valve performs a vertical movement which is mechanically coupled with an opening and closing movement of said 2/2-way valve. 13. An injection as defined in claim 1, wherein said valve body has a slider portion and an unloading opening located under said slider portion and branching from said nozzle inlet to said nozzle chamber, and a closure element which is coupled with a vertical movement of said valve body inside an injector housing. 14. An injection as defined in claim 1, wherein said nozzle needle is movable as a single component with a nozzle needle piston acted through said further control chamber and a pressure stage from a nozzle seat.