Injection system and method for producing an injection system

{
  "publication_number": "US2009200406A1",
  "country": "US",
  "kind": "A1",
  "title": "Injection system and method for producing an injection system",
  "abstract": "An injection system (1) for injecting fuel at a predetermined fuel pressure has: an actuator (2, 3) providing a stroke for lifting an injector needle (4) that opens a nozzle into which the fuel is injected; a leverage apparatus (5) for translating the provided stroke into a modified stroke, the apparatus has a compensating device (6) coupled to the actuator (2, 3), and a lever device (7), which is coupled to the injector needle (4), wherein the lever device has at least two symmetrically disposed, single-arm levers (8 a, 8 b), which each come in contact with an injector needle head (10) of the injector needle (4) when lifting the injector needle (4) by means of a single needle head support (9 a, 9 b); and wherein the compensating device (6) is suited to compensate a varying force application of the actuator (2, 3) on the single-arm lever (8 a, 8 b).",
  "claims": [
    "1. An injection system for injection of fuel at a predetermined fuel pressure comprising: a) an actuator, which provides a stroke for lifting an injector which opens a nozzle into which the fuel is injected; b) a lever transmission facility for translating the stroke provided into a modified stroke, which features comprises a compensation device which is coupled to the actuator and a lever device which is coupled to the injector needle, c) wherein the lever device comprises at least two symmetrically-arranged single-arm levers which each contact by means of an individual needle head support an injector needle head of the injector needle during lifting of the injector needle; and d) wherein the compensation device is suitable for compensating for a different force effect of the actuator on the single-arm levers. 2. The injection system according to claim 1, wherein the actuator is embodied as a magnetic actuators or as a piezoactuator. 3. The injection system according to claim 2, wherein the magnetic actuator has a flat armature or a plunger armature. 4. The injection system according to claim 3, wherein the magnetic actuator with the plunger armature has an ancillary air gap. 5. The injection system according to claim 3, wherein the magnetic actuator with the flat armature has a torus coil or a toroidal coil. 6. The injection system according to claim 1, wherein the single-arm levers are separated from each other by means of a separation gap. 7. The injection system according to claim 2, wherein a hydraulic compensator is provided which comprises a compensator bowl and a piston engaging in the compensator bowl, with a space being embodied between the compensator bowl and the piston which is filled with a fluid, with the space being coupled for hydraulic compensation to a compensation volume via a flow gap. 8. The injection system according to claim 7, wherein a base plate of the piezoactuator is coupled to the compensator bowl and the compensation device comprises the piston. 9. The injection system according to claim 7, wherein a base plate of the piezoactuator is coupled to the piston and the compensation device comprises the compensator bowl. 10. The injection system according to claim 2, wherein the piezoactuator comprises a controllable piezo stack which, depending on a control signal, provides the stroke for actuating the injector needle in a closing direction or in an opening direction. 11. A method for manufacturing an injection system for injection of fuel at a predetermined fuel pressure comprising the following steps: a) Arranging an actuator in a housing of the injection system, which provides a stroke for lifting an injector needle which opens a nozzle into which the fuel is injected; b) Coupling the actuator to a lever translation facility for translating the stroke provided into a modified stroke, which comprises a compensation device which is coupled to the actuator, and a lever device which is coupled to the injector needle, with the lever device comprising at least two symmetrically-arranged single-arm levers which in each case by means of an individual needle head support contact an injector needle head of the injector needle for lifting the injector needle, wherein the compensation device is operable to compensate for a different force effect of the actuator on the single-arm levers. 12. The method according to claim 11, wherein the modified stroke is an increased stroke. 13. The injection system according to claim 3, wherein the magnetic actuator with the flat armature has a torus coil or a toroidal coil, wherein the flat armature has a square cross-section. 14. The injection system according to claim 7, wherein the fluid is the fuel. 15. An method for injection of fuel at a predetermined fuel pressure comprising the steps of: a) providing a stroke by an actuator for lifting an injector needle which opens a nozzle into which the fuel is injected; and b) translating the stroke provided into a modified stroke by a compensation device which is coupled to the actuator and a lever device which is coupled to the injector needle, wherein the lever device comprises at least two symmetrically-arranged single-arm levers which each contact by means of an individual needle head support an injector needle head of the injector needle during lifting of the injector needle; and wherein the compensation device is suitable for compensating for a different force effect of the actuator on the single-arm levers. 16. The method according to claim 15, comprising the step of separating the single-arm levers from each other by means of a separation gap. 17. The method according to claim 15, comprising the step of providing a hydraulic compensator which comprises a compensator bowl and a piston engaging in the compensator bowl, with a space being embodied between the compensator bowl and the piston which is filled with the fuel, with the space being coupled for hydraulic compensation to a compensation volume via a flow gap. 18. The method according to claim 17, comprising the step of coupling a base plate of a piezoactuator to the compensator bowl wherein the compensation device comprises the piston. 19. The method according to claim 17, comprising the step of coupling a base plate of a piezoactuator to the piston wherein the compensation device comprises the compensator bowl. 20. The method according to claim 15, comprising the step of providing the stroke for actuating the injector needle in a closing direction or in an opening direction by a piezoactuator comprising a controllable piezo stack controlled by a control signal."
  ],
  "cpc": [
    "F02M 51/0603",
    "F02M 2200/702",
    "F02M 2200/705",
    "Y10T 29/49428"
  ],
  "assignees": [
    "KRONBERGER MAXIMILIAN"
  ],
  "filing_date": "2006-10-02",
  "publication_date": "2009-08-13",
  "priority_date": "2006-07-07",
  "application_number": "US-30645906-A",
  "family_id": "37913722",
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}