EP1076771B1 - Fuel injection valve for internal combustion engines - Google Patents

Fuel injection valve for internal combustion engines Download PDF

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Publication number
EP1076771B1
EP1076771B1 EP99932634A EP99932634A EP1076771B1 EP 1076771 B1 EP1076771 B1 EP 1076771B1 EP 99932634 A EP99932634 A EP 99932634A EP 99932634 A EP99932634 A EP 99932634A EP 1076771 B1 EP1076771 B1 EP 1076771B1
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EP
European Patent Office
Prior art keywords
area
bore
guide
piston
fuel injection
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP99932634A
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German (de)
French (fr)
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EP1076771A2 (en
Inventor
Hakan Yalcin
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Siemens AG
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Siemens AG
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Publication of EP1076771A2 publication Critical patent/EP1076771A2/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting

Definitions

  • the invention relates to a fuel injection valve according to the preamble of claim 1.
  • Such a fuel injector is from the document EP 0 363 142 A1 known.
  • the nozzle body of the known fuel injection valve is the partition between the pilot hole and the fuel supply channel through the high Injection pressure extremely stressed.
  • the fuel inlet channel runs from the front of the nozzle body, first essentially parallel to the guide bore, then in bend further course curved in the direction of the pressure chamber and finally to flow into the pressure room.
  • the object of the invention is the compressive strength to increase the fuel injection valve.
  • An advantage of the invention is the compressive strength to increase the nozzle body. Another advantage is low manufacturing costs.
  • a fuel injector, especially for diesel fuel must have a high compressive strength to the high To withstand fuel pressure.
  • the compressive strength is dependent of the achievable minimum wall thickness of the components of the fuel injector.
  • the part of a fuel injector shown in Figure 1 has a nozzle body 300 with a rotationally symmetrical Basic form on the intermediate layer of an intermediate piece 200 by means of a sleeve-shaped union nut 600 a nozzle holder body 100 is attached.
  • the nozzle body 300 is from its end face to the nozzle holder body 100 pointing end in following body sections divided: into a guide area 310, a pressure area 330, a shaft area 350 and a the nozzle body 300 final nozzle tip 370.
  • the nozzle body 300 has one at its front end beginning and ending at its nozzle tip 370, central Nozzle body bore, its diameter and function with the body portions of the nozzle body 300 varies.
  • a nozzle needle 500 runs in the direction of the nozzle body bore the nozzle tip 370 into a guide piston 510, a Ring shoulder 520, a shaft piston 530 and a valve tip 540 is divided.
  • the guide area 310 has a central guide bore 312, which serves to guide the guide piston 510 and a bore opening on the front side of the guide region 310 314 has.
  • the pressure chamber region 330 connects to the guide region 310 which has a pressure chamber 334.
  • the guide bore 312 opens into the pressure chamber 334 into which the guide piston 510 is led.
  • the guide piston preferably goes in the pressure chamber 334 510 into the tapered ring shoulder 520 over, which merges into the shaft piston 530.
  • An inlet channel 338 is arranged on the side of the guide bore 312, which preferably opens laterally into the pressure chamber 334.
  • the inlet channel 338 has at the front end of the guide area 310 an inlet opening 342 and is preferred designed as a cylindrical bore, which is advantageous is easy and precise to manufacture, e.g. by eroding or Drill.
  • the axis of the inlet channel 338 preferably forms a plane with the longitudinal axis 301 of the nozzle body 300.
  • the guide area 310 is preferably through a shoulder into an upper body portion 316 with an annular Face 322 and in a lower body portion 318 with an annular shoulder surface 324, the upper body portion 316 at the front end of the guide area 310 is arranged.
  • the normals of the face 322 and shoulder surface 324 are preferably approximately parallel directed to the longitudinal axis 301.
  • a simple manufacture is thereby advantageously possible, e.g. by turning and polishing of the areas.
  • the upper body portion 316 has a smaller one Diameter on than the lower body portion 318.
  • the End face 322 has the bore opening 314 that Shoulder surface 324 has the inlet opening 324.
  • the shaft region 350 connects to the pressure chamber region 330 and has a shaft bore 355 that connects to the pressure chamber 334 connects and through which the shaft piston 530 runs.
  • the pressure chamber 334 is preferably symmetrical in cross section handle-shaped recess formed between the guide bore 312 and the shaft bore 355. in the The area of the upper part of the handle closes the wall of the Guide bore 312 with the wall of the pressure chamber 334 a An angle that is preferably in the range of 90 °. In the area The pressure space 334 runs in the lower part of the handle conical together, the wall of the pressure chamber 334 goes down at a flat angle into the wall of the shaft area 350 about.
  • the tapered nozzle tip adjoins the shaft region 350 370 to which an internal valve seat 374 for for receiving the valve tip 540.
  • the nozzle tip 370 has at least one spray hole 378 through which the Fuel is injected into the combustion chamber of the internal combustion engine becomes.
  • the axial movement of valve tip 540 controls the fuel flow into the combustion chamber, being at rest the valve tip 540 covers the spray holes 378 or stops the flow of fuel to the spray holes 378.
  • the fuel is supplied from the inlet channel 338 in the nozzle body 300 via the pressure chamber 334, the shaft bore 355, the valve seat 374 led to the spray holes 378.
  • the outside of the nozzle body 300 is preferably in height of the pressure chamber 334 and stepped at the height of the shaft region 350, wherein the diameter of the nozzle body 300 changes reduced in the direction of the nozzle tip 370.
  • the intermediate piece 200 is hollow cylindrical and has a central piston bore 215 for guiding a piston 400 and one on the side, preferably approximately parallel to the piston bore 215 arranged feed channel 235.
  • the intermediate piece 200 limits the stroke of the nozzle needle 500 since the piston bore 215 has a smaller diameter than the guide piston 510 of the nozzle needle 500.
  • the piston 400 transmits the axial one through a control valve or an actuator-generated movement on the nozzle needle 500.
  • the nozzle needle 500 exerts an axial direction on the piston 400 of the piston 400 directed force from the fuel pressure on the ring shoulder 520 and on the effective one Annular surface is generated at the valve tip 540.
  • FIG. 2 shows details of the fuel injection valve from FIG 1 with the nozzle body 300 and the intermediate piece 200.
  • the Inlet channel 338 is preferably a cylindrical bore trained, which are advantageously manufactured easily and accurately can.
  • the area between the paragraph at the level of the print area 334 and the end face 322 of the guide area 310, is the collar area with the collar length dl and the collar diameter db at the level of the pressure chamber 334.
  • the axial height difference between the face 322 and the shoulder surface 324 is the heel length la.
  • the intermediate wall 346 Between the inlet channel 338 and the guide bore 312 there is an intermediate wall 346. At the mouths of the inlet channel 338 and the guide bore 312 in the pressure chamber 334 the intermediate wall 346 has a smallest wall thickness d.
  • a large wall thickness d advantageously leads to a high one Compressive strength of the nozzle body 300.
  • the inlet channel 338 forms an angle a with the guide bore 312.
  • the Wall thickness d depends on from the angle a, from the collar diameter db, the bundle length dl and the heel length la.
  • An embodiment of the nozzle body 300 from FIG. 2 has a collar diameter db of approximately 14.3 mm and a collar length dl from about 15 mm.
  • the angle a in the range from 10 ° to 45 °. In a preferred one Form of training occurs for example with a paragraph length of 9 mm an angle of approx. 28 °.
  • the angle is preferably a in the range of 10 ° to 45 °.
  • the intermediate piece 200 is through a shoulder on its Piston bore 215 facing inside in the axial direction divided into a hollow cylindrical feed area 220 and a hollow cylindrical piston portion 240, the piston portion 240 has a smaller inner diameter than the feed area 220.
  • the piston area 240 is closer to Nozzle holder body 100 located as the feed area 220.
  • the feed channel 235 runs in the jacket of the feed area 220 and preferably in the jacket of the piston region 240 approximately parallel to piston bore 215.
  • the shoulder of the intermediate piece 200 closes with that on the front End of the nozzle body 300 located paragraph of the guide area 310 conclusively.
  • the inlet channel 338 of the nozzle body 300 connects to the feed channel 235 of the intermediate piece 200 at.
  • the shoulder surface 324 of the nozzle body 300 lies flat on the end face of the adapter 200 at. Due to the strong pressing force between nozzle body 300 and adapter 200 creates a high pressure resistant connection.
  • the normals are Front surface 322, the shoulder surface 324 and the front Surface of the intermediate piece 200 directed obliquely to the longitudinal axis 301.
  • the compressive strength is also advantageous to increase if the edges in the area of the smallest wall thickness d additionally be rounded off, e.g. about electrochemical rounding.
  • FIG 3 shows a further embodiment of the nozzle body 300 with the intermediate piece 200.
  • the intermediate piece 200 as hollow cylindrical feed sleeve 230 without internal shoulder educated.
  • the feed channel 235 is in the jacket Feed sleeve 230 arranged.
  • the feed sleeve 230 encloses preferably entirely the upper body portion 316 of the Guide area 310.
  • the one end face of the feed sleeve 230 connects to the shoulder surface 324 of the guide area 310 at.
  • the feed sleeve 230 and the end face 322 adjoin the nozzle holder body 100.
  • the inlet channel 338 of the nozzle body 300 connects to the feed channel 235 of the feed sleeve 230.

Description

Die Erfindung betrifft ein Kraftstoffeinspritzventil gemäß dem Oberbegriff von Patentanspruch 1.The invention relates to a fuel injection valve according to the preamble of claim 1.

Ein solches Kraftstoffeinspritzventil ist aus dem Dokument EP 0 363 142 A1 bekannt. Im Düsenkörper des bekannten Kraftstoffeinspritzventils ist die Zwischenwand zwischen der Führungsbohrung und dem Kraftstoffzulaufkanal durch den hohen Einspritzdruck extrem belastet. Der Kraftstoffzulaufkanal verläuft, von der Stirnseite des Düsenkörpers ausgehend, zuerst im wesentlichen parallel zur Führungsbohrung, um dann im weiteren Verlauf gekrümmt in Richtung des Druckraums abzubiegen und schließlich in den Druckraum zu münden.Such a fuel injector is from the document EP 0 363 142 A1 known. In the nozzle body of the known fuel injection valve is the partition between the pilot hole and the fuel supply channel through the high Injection pressure extremely stressed. The fuel inlet channel runs from the front of the nozzle body, first essentially parallel to the guide bore, then in bend further course curved in the direction of the pressure chamber and finally to flow into the pressure room.

Die Aufgabe der Erfindung besteht darin, die Druckfestigkeit des Kraftstoffeinspritzventils zu steigern.The object of the invention is the compressive strength to increase the fuel injection valve.

Die Aufgabe der Erfindung wird durch die Merkmale des Patentanspruchs 1 gelöst.The object of the invention is achieved by the features of the patent claim 1 solved.

Weitere vorteilhafte Ausbildungen und Verbesserungen der Erfindung sind in den abhängigen Ansprüchen angegeben.Further advantageous developments and improvements of the invention are specified in the dependent claims.

Ein Vorteil der Erfindung besteht darin, die Druckfestigkeit des Düsenkörpers zu erhöhen. Ein weiterer Vorteil liegt im geringen Fertigungsaufwand.An advantage of the invention is the compressive strength to increase the nozzle body. Another advantage is low manufacturing costs.

Ein Kraftstoffeinspritzventil, insbesondere für Dieselkraftstoff, muß eine hohe Druckfestigkeit aufweisen, um dem hohen Kraftstoffdruck standzuhalten. Die Druckfestigkeit ist abhängig von den erzielbaren minimalen Wandstärken der Komponenten des Kraftstoffeinspritzventils. Durch die bevorzugte Ausbildung eines Absatzes an der Stirnseite des Düsenkörpers wird eine hohe Wandstärke in kritischen Bereichen und somit eine hohe Druckfestigkeit erzielt.A fuel injector, especially for diesel fuel must have a high compressive strength to the high To withstand fuel pressure. The compressive strength is dependent of the achievable minimum wall thickness of the components of the fuel injector. By preferred training a paragraph on the face of the nozzle body a high wall thickness in critical areas and therefore a high compressive strength achieved.

Im folgenden wird die Erfindung anhand der Figuren näher erläutert; es zeigen:

Figur 1
einen Längsschnitt durch einen Teil eines Kraftstoffeinspritzventils,
Figur 2
einen Längsschnitt eines ersten Ausführungsbeispiels eines Düsenkörpers und eines Zwischenstücks aus Figur 1, und
Figur 3
einen Längsschnitt eines zweiten Ausführungsbeispiels eines Düsenkörpers und eines Zwischenstücks.
The invention is explained in more detail below with reference to the figures; show it:
Figure 1
2 shows a longitudinal section through part of a fuel injection valve,
Figure 2
a longitudinal section of a first embodiment of a nozzle body and an intermediate piece from Figure 1, and
Figure 3
a longitudinal section of a second embodiment of a nozzle body and an intermediate piece.

Elemente gleicher Konstruktion oder Funktion tragen in den Figuren 1 bis 4 im Allgemeinen dieselben Bezugszeichen.Elements of the same construction or function carry in the Figures 1 to 4 generally the same reference numerals.

Der in Figur 1 dargestellte Teil eines Kraftstoffeinspritzventils weist einen Düsenkörper 300 mit rotationssymmetrischer Grundform auf, der unter Zwischenlage eines Zwischenstücks 200 mittels einer hülsenförmigen Überwurfmutter 600 an einen Düsenhalterkörper 100 befestigt ist.The part of a fuel injector shown in Figure 1 has a nozzle body 300 with a rotationally symmetrical Basic form on the intermediate layer of an intermediate piece 200 by means of a sleeve-shaped union nut 600 a nozzle holder body 100 is attached.

Der Düsenkörper 300 ist von seinem stirnseitigen, zum Düsenhalterkörper 100 weisenden Ende in folgende Körperabschnitte unterteilt: in einen Führungsbereich 310, einen Druckraumbereich 330, einen Schaftbereich 350 und eine den Düsenkörper 300 abschließenden Düsenspitze 370.The nozzle body 300 is from its end face to the nozzle holder body 100 pointing end in following body sections divided: into a guide area 310, a pressure area 330, a shaft area 350 and a the nozzle body 300 final nozzle tip 370.

Der Düsenkörper 300 weist eine an seinem stirnseitigen Ende beginnende und an seiner Düsenspitze 370 endende, zentrale Düsenkörperbohrung auf, dessen Durchmesser und Funktion mit den Körperabschnitten des Düsenkörpers 300 variiert. In der Düsenkörperbohrung verläuft eine Düsennadel 500, die in Richtung der Düsenspitze 370 in einen Führungskolben 510, eine Ringschulter 520, einen Schaftkolben 530 und eine Ventilspitze 540 unterteilt ist.The nozzle body 300 has one at its front end beginning and ending at its nozzle tip 370, central Nozzle body bore, its diameter and function with the body portions of the nozzle body 300 varies. In the A nozzle needle 500 runs in the direction of the nozzle body bore the nozzle tip 370 into a guide piston 510, a Ring shoulder 520, a shaft piston 530 and a valve tip 540 is divided.

Der Führungsbereich 310 weist eine zentrale Führungsbohrung 312 auf, die zur Führung des Führungskolbens 510 dient und die an der Stirnseite des Führungsbereichs 310 eine Bohrungsöffnung 314 hat.The guide area 310 has a central guide bore 312, which serves to guide the guide piston 510 and a bore opening on the front side of the guide region 310 314 has.

An den Führungsbereich 310 schließt der Druckraumbereich 330 an, der einen Druckraum 334 aufweist. Die Führungsbohrung 312 mündet in den Druckraum 334, in den der Führungskolben 510 geführt ist. Vorzugsweise im Druckraum 334 geht der Führungskolben 510 in die sich konisch verjüngende Ringschulter 520 über, die in den Schaftkolben 530 übergeht.The pressure chamber region 330 connects to the guide region 310 which has a pressure chamber 334. The guide bore 312 opens into the pressure chamber 334 into which the guide piston 510 is led. The guide piston preferably goes in the pressure chamber 334 510 into the tapered ring shoulder 520 over, which merges into the shaft piston 530.

Seitlich der Führungsbohrung 312 ist ein Zulaufkanal 338 angeordnet, der vorzugsweise seitlich in den Druckraum 334 mündet. Der Zulaufkanal 338 weist am stirnseitigen Ende des Führungsbereichs 310 eine Zulauföffnung 342 auf und ist vorzugsweise als zylindrische Bohrung ausgeführt, die vorteilhaft einfach und genau zu fertigen ist, z.B. durch Erodieren oder Bohren. Vorzugsweise bildet die Achse des Zulaufkanals 338 mit der Längsachse 301 des Düsenkörpers 300 eine Ebene.An inlet channel 338 is arranged on the side of the guide bore 312, which preferably opens laterally into the pressure chamber 334. The inlet channel 338 has at the front end of the guide area 310 an inlet opening 342 and is preferred designed as a cylindrical bore, which is advantageous is easy and precise to manufacture, e.g. by eroding or Drill. The axis of the inlet channel 338 preferably forms a plane with the longitudinal axis 301 of the nozzle body 300.

Vorzugsweise ist der Führungsbereich 310 durch einen Absatz in einen oberen Körperabschnitt 316 mit einer ringförmigen Stirnfläche 322 und in einen unteren Körperabschnitt 318 mit einer ringförmigen Schulterfläche 324 abgestuft, wobei der obere Körperabschnitt 316 am stirnseitigen Ende des Führungsbereichs 310 angeordnet ist. Die Normalen der Stirnfläche 322 und der Schulterfläche 324 sind vorzugsweise annähernd parallel zur Längsachse 301 gerichtet. Eine einfache Fertigung ist dadurch vorteilhaft möglich, z.B. durch Drehen und Polieren der Flächen. Der obere Körperabschnitt 316 weist einen geringeren Durchmesser auf als der untere Körperabschnitt 318. Die Stirnfläche 322 weist die Bohrungsöffnung 314 auf, die Schulterfläche 324 weist die Zulauföffnung 324 auf.The guide area 310 is preferably through a shoulder into an upper body portion 316 with an annular Face 322 and in a lower body portion 318 with an annular shoulder surface 324, the upper body portion 316 at the front end of the guide area 310 is arranged. The normals of the face 322 and shoulder surface 324 are preferably approximately parallel directed to the longitudinal axis 301. A simple manufacture is thereby advantageously possible, e.g. by turning and polishing of the areas. The upper body portion 316 has a smaller one Diameter on than the lower body portion 318. The End face 322 has the bore opening 314 that Shoulder surface 324 has the inlet opening 324.

Der Schaftbereich 350 schließt an den Druckraumbereich 330 an und weist eine Schaftbohrung 355 auf, die an den Druckraum 334 anschließt und durch die der Schaftkolben 530 verläuft.The shaft region 350 connects to the pressure chamber region 330 and has a shaft bore 355 that connects to the pressure chamber 334 connects and through which the shaft piston 530 runs.

Der Druckraum 334 ist als vorzugsweise symmetrische, im querschnitt henkelförmige Ausnehmung ausgebildet, die zwischen der Führungsbohrung 312 und der Schaftbohrung 355 liegt. Im Bereich des oberen Teils des Henkels schließt die Wandung der Führungsbohrung 312 mit der Wandung des Druckraum 334 einen Winkel ein, der vorzugsweise im Bereich von 90° liegt. Im Bereich des unteren Teils des Henkels läuft der Druckraum 334 konisch zusammen, die Wandung des Druckraums 334 geht unter einem flachen Winkel in die Wandung des Schaftbereichs 350 über.The pressure chamber 334 is preferably symmetrical in cross section handle-shaped recess formed between the guide bore 312 and the shaft bore 355. in the The area of the upper part of the handle closes the wall of the Guide bore 312 with the wall of the pressure chamber 334 a An angle that is preferably in the range of 90 °. In the area The pressure space 334 runs in the lower part of the handle conical together, the wall of the pressure chamber 334 goes down at a flat angle into the wall of the shaft area 350 about.

An den Schaftbereich 350 schließt die konisch zulaufende Düsenspitze 370 an, die einen innenliegenden Ventilsitz 374 zur zur Aufnahme der Ventilspitze 540 aufweist. Die Düsenspitze 370 weist mindestens ein Spritzloch 378 auf, durch das der Kraftstoff in den Brennraum der Brennkraftmaschine eingespritzt wird. Die axiale Bewegung der Ventilspitze 540 steuert den Kraftstoffzufluß in den Brennraum, wobei im Ruhezustand die Ventilspitze 540 die Spritzlöcher 378 abdeckt bzw. den Kraftstoffzufluß zu den Spritzlöchern 378 unterbricht. Der Kraftstoff wird im Düsenkörper 300 vom Zulaufkanal 338 über den Druckraum 334, die Schaftbohrung 355, den Ventilsitz 374 zu den Spritzlöchern 378 geführt.The tapered nozzle tip adjoins the shaft region 350 370 to which an internal valve seat 374 for for receiving the valve tip 540. The nozzle tip 370 has at least one spray hole 378 through which the Fuel is injected into the combustion chamber of the internal combustion engine becomes. The axial movement of valve tip 540 controls the fuel flow into the combustion chamber, being at rest the valve tip 540 covers the spray holes 378 or stops the flow of fuel to the spray holes 378. The fuel is supplied from the inlet channel 338 in the nozzle body 300 via the pressure chamber 334, the shaft bore 355, the valve seat 374 led to the spray holes 378.

Die Außenseite des Düsenkörpers 300 ist vorzugsweise in Höhe des Druckraumes 334 und in Höhe des Schaftbereichs 350 abgestuft, wobei sich der Durchmesser des Düsenkörpers 300 sich in Richtung der Düsenspitze 370 verringert.The outside of the nozzle body 300 is preferably in height of the pressure chamber 334 and stepped at the height of the shaft region 350, wherein the diameter of the nozzle body 300 changes reduced in the direction of the nozzle tip 370.

Das Zwischenstück 200 ist hohlzylindrisch ausgebildet und weist eine zentrale Kolbenbohrung 215 zur Führung eines Kolbens 400 und einen seitlich, vorzugsweise annähernd parallel zur Kolbenbohrung 215 angeordneten Zuführungskanal 235 auf.The intermediate piece 200 is hollow cylindrical and has a central piston bore 215 for guiding a piston 400 and one on the side, preferably approximately parallel to the piston bore 215 arranged feed channel 235.

Das Zwischenstück 200 begrenzt den Hub der Düsennadel 500, da die Kolbenbohrung 215 einen geringeren Durchmesser aufweist als der Führungskolben 510 der Düsennadel 500.The intermediate piece 200 limits the stroke of the nozzle needle 500 since the piston bore 215 has a smaller diameter than the guide piston 510 of the nozzle needle 500.

Der Kolben 400 überträgt die axiale, durch ein Steuerventil oder einen Aktor erzeugte Bewegung auf die Düsennadel 500. Die Düsennadel 500 übt auf den Kolben 400 eine axial in Richtung des Kolbens 400 gerichtete Kraft aus, die vom Kraftstoffdruck auf die Ringschulter 520 und auf die wirksame Ringfläche an der Ventilspitze 540 erzeugt wird.The piston 400 transmits the axial one through a control valve or an actuator-generated movement on the nozzle needle 500. The nozzle needle 500 exerts an axial direction on the piston 400 of the piston 400 directed force from the fuel pressure on the ring shoulder 520 and on the effective one Annular surface is generated at the valve tip 540.

Zur Verdeutlichung sind einige Bezugszeichen aus der Figur 1 ebenfalls in der Figur 2 aufgeführt.For clarification, some reference numerals from FIG. 1 are also listed in Figure 2.

Figur 2 zeigt Details des Kraftstoffeinspritzventils aus Figur 1 mit dem Düsenkörper 300 und dem Zwischenstück 200. Der Zulaufkanal 338 ist vorzugsweise als zylindrische Bohrung ausgebildet, die vorteilhaft einfach und genau gefertigt werden kann.FIG. 2 shows details of the fuel injection valve from FIG 1 with the nozzle body 300 and the intermediate piece 200. The Inlet channel 338 is preferably a cylindrical bore trained, which are advantageously manufactured easily and accurately can.

Der Bereich, der zwischen dem Absatz in Höhe des Druckaumes 334 und der Stirnfläche 322 des Führungsbereichs 310 liegt, ist der Bundbereich mit der Bundlänge dl und dem Bunddurchmesser db in Höhe des Druckraumes 334.The area between the paragraph at the level of the print area 334 and the end face 322 of the guide area 310, is the collar area with the collar length dl and the collar diameter db at the level of the pressure chamber 334.

Der axiale Höhenunterschied zwischen der Stirnfläche 322 und der Schulterfläche 324 ist die Absatzlänge la. The axial height difference between the face 322 and the shoulder surface 324 is the heel length la.

Zwischen dem Zulaufkanal 338 und der Führungsbohrung 312 liegt eine Zwischenwand 346. An den Mündungen des Zulaufkanals 338 und der Führungsbohrung 312 in den Druckraum 334 weist die Zwischenwand 346 eine geringste Wandstärke d auf. Eine große Wandstärke d führt vorteilhaft zu einer hohen Druckfestigkeit des Düsenkörpers 300. Der Zulaufkanal 338 schließt mit der Führungbohrung 312 einen Winkel a ein. Die Wandstärke d hängt u.a. vom Winkel a, vom Bunddurchmesser db, der Bundlänge dl und von der Absatzlänge la ab.Between the inlet channel 338 and the guide bore 312 there is an intermediate wall 346. At the mouths of the inlet channel 338 and the guide bore 312 in the pressure chamber 334 the intermediate wall 346 has a smallest wall thickness d. A large wall thickness d advantageously leads to a high one Compressive strength of the nozzle body 300. The inlet channel 338 forms an angle a with the guide bore 312. The Wall thickness d depends on from the angle a, from the collar diameter db, the bundle length dl and the heel length la.

Je kleiner die Bundlänge dl bei vorgegebener Position des Absatzes in Höhe des Druckraumes 334, je größer die Absatzlänge la und je größer der Bunddurchmesser db ist, desto größer kann der Winkel a ausgebildet werden, was zu einer größeren Wandstärke d führt.The smaller the bundle length dl for a given position of the heel at the height of the pressure chamber 334, the greater the length of the heel la and the larger the collar diameter db, the larger the angle a can be formed, resulting in a larger one Wall thickness d leads.

Dieser Zusammenhang gilt auch für Düsenkörper mit Ausbildungsformen, die von den in den Ausbildungsbeispielen angegebenen Ausbildungsformen abweichen.This connection also applies to nozzle bodies with training forms, those of those given in the training examples Forms of training differ.

Eine Ausführungsform des Düsenkörpers 300 aus Figur 2 weist einen Bunddurchmesser db von etwa 14,3 mm und eine Bundlänge dl von etwa 15 mm auf. Abhängig von der Absatzlänge la liegt der Winkel a im Bereich von 10° bis 45°. In einer bevorzugten Ausbildungsform tritt beispielsweise bei einer Absatzlänge von 9 mm ein Winkel von ca. 28° auf.An embodiment of the nozzle body 300 from FIG. 2 has a collar diameter db of approximately 14.3 mm and a collar length dl from about 15 mm. Depending on the length of the heel la the angle a in the range from 10 ° to 45 °. In a preferred one Form of training occurs for example with a paragraph length of 9 mm an angle of approx. 28 °.

Andere Ausbildungsformen mit abweichenden Bunddurchmessern db, Bundlängen dl und Absatzlängen la weisen entsprechend andere Bereiche des Winkels a auf. Vorzugsweise liegt der Winkel a im Bereich von 10° bis 45°.Other forms of training with different collar diameters db, bundle lengths dl and heel lengths la have other accordingly Areas of the angle a on. The angle is preferably a in the range of 10 ° to 45 °.

Das Zwischenstück 200 ist durch einen Absatz an seiner zur Kolbenbohrung 215 weisenden Innenseite in axialer Richtung unterteilt in einen hohlzylindrischen Zuführungsbereich 220 und einen hohlzylindrischen Kolbenbereich 240, wobei der Kolbenbereich 240 einen geringeren Innendurchmesser aufweist als der Zuführungsbereich 220. Der Kolbenbereich 240 ist näher am Düsenhalterkörper 100 gelegen als der Zuführungsbereich 220.The intermediate piece 200 is through a shoulder on its Piston bore 215 facing inside in the axial direction divided into a hollow cylindrical feed area 220 and a hollow cylindrical piston portion 240, the piston portion 240 has a smaller inner diameter than the feed area 220. The piston area 240 is closer to Nozzle holder body 100 located as the feed area 220.

Der Zuführungskanal 235 verläuft im Mantel des Zuführungsbereichs 220 und im Mantel des Kolbenbereichs 240 vorzugsweise annähernd parallel zur Kolbenbohrung 215.The feed channel 235 runs in the jacket of the feed area 220 and preferably in the jacket of the piston region 240 approximately parallel to piston bore 215.

Der Absatz des Zwischenstücks 200 schließt mit dem am stirnseitigen Ende des Düsenkörpers 300 gelegenen Absatz des Führungsbereichs 310 schlüssig ab. Der Zulaufkanal 338 des Düsenkörpers 300 schließt an den Zuführungskanal 235 des Zwischenstücks 200 an. Die Schulterfläche 324 des Düsenkörpers 300 liegt plan an der stirnseitigen Fläche des Zwischenstücks 200 an. Durch die starke Preßkraft zwischen Düsenkörper 300 und Zwischenstück 200 entsteht eine hochdruckfeste Verbindung.The shoulder of the intermediate piece 200 closes with that on the front End of the nozzle body 300 located paragraph of the guide area 310 conclusively. The inlet channel 338 of the nozzle body 300 connects to the feed channel 235 of the intermediate piece 200 at. The shoulder surface 324 of the nozzle body 300 lies flat on the end face of the adapter 200 at. Due to the strong pressing force between nozzle body 300 and adapter 200 creates a high pressure resistant connection.

In einer weiteren Ausbildungsform sind die Normalen der Stirnfläche 322, der Schulterfläche 324 und der stirnseitigen Fläche des Zwischenstücks 200 schräg zur Längsachse 301 gerichtet.In another form of training, the normals are Front surface 322, the shoulder surface 324 and the front Surface of the intermediate piece 200 directed obliquely to the longitudinal axis 301.

Die Druckfestigkeit ist zusätzlich vorteilhaft zu steigern, wenn die Kanten im Bereich der geringsten Wandstärke d zusätzlich abgerundet werden, z.B. über elektrochemisches Verrunden.The compressive strength is also advantageous to increase if the edges in the area of the smallest wall thickness d additionally be rounded off, e.g. about electrochemical rounding.

Figur 3 zeigt eine weiteres Ausführungsbeispiel des Düsenkörpers 300 mit dem Zwischenstück 200. Im Unterschied zum Ausführungsbeispiel aus Figur 2 ist das Zwischenstück 200 als hohlzylindrische Zuführungshülse 230 ohne innenliegenden Absatz ausgebildet. Der Zuführungskanal 235 ist im Mantel der Zuführungshülse 230 angeordnet. Die Zuführungshülse 230 umschließt vorzugsweise ganz den oberen Körperabschnitt 316 des Führungsbereichs 310. Das eine stirnseitige Ende der Zuführungshülse 230 schließt an die Schulterfläche 324 des Führungsbereichs 310 an. Die Zuführungshülse 230 und die Stirnfläche 322 grenzen an den Düsenhalterkörper 100. Der Zulaufkanal 338 des Düsenkörpers 300 schließt an den Zuführungskanal 235 der Zuführungshülse 230 an.Figure 3 shows a further embodiment of the nozzle body 300 with the intermediate piece 200. In contrast to the embodiment from Figure 2, the intermediate piece 200 as hollow cylindrical feed sleeve 230 without internal shoulder educated. The feed channel 235 is in the jacket Feed sleeve 230 arranged. The feed sleeve 230 encloses preferably entirely the upper body portion 316 of the Guide area 310. The one end face of the feed sleeve 230 connects to the shoulder surface 324 of the guide area 310 at. The feed sleeve 230 and the end face 322 adjoin the nozzle holder body 100. The inlet channel 338 of the nozzle body 300 connects to the feed channel 235 of the feed sleeve 230.

Claims (5)

  1. Fuel injection valve with a nozzle element (300), comprising:
    a guide area (310) at its front face end with a central guide bore (312), which has a bore opening (314) at the front face end of the guide area (310),
    a pressure chamber area (330), which is connected to the guide area (310) and which comprises a pressure chamber (334), into which the guide bore (312) opens,
    an intake channel (338) arranged to the side of the guide bore (312) and opening into the pressure chamber (334), whereby the intake channel (338) has an intake opening (342) at the front face end of the guide area (310),
    characterized in that
    the guide area (310) is graduated by means of an offset into an upper section (316) with a front face (322) and a lower section (318) with a shoulder surface (324),
    the lower section (318) is arranged closer to the pressure chamber area (330) than the upper section (316),
    the upper section (316) has a smaller diameter than the lower section (318), and
    the intake opening (342) is located in the shoulder surface (324) and the bore opening (314) is located on the front face (322).
  2. Fuel injection valve according to Claim 1, characterized in that
    the intake channel (338) of the nozzle element (300) is configured as a cylindrical bore.
  3. Fuel injection valve according to one of Claims 1 or 2, characterized in that
    the angle (a), which the intake channel (338) forms with the guide bore (312) is in the range from 10° to 45°.
  4. Fuel injection valve according to one of Claims 1 to 3, characterized in that
    a hollow cylindrical intermediate piece (200) is arranged between the nozzle element (300) and a nozzle retaining element (100), comprising a central piston bore (215) and a supply channel (235) located to the side of the piston bore (215),
    the intermediate piece (200) is divided on its side facing the piston bore (215) by means of an offset into a hollow cylindrical supply area (220) and a hollow cylindrical piston area (240),
    the piston area (240) is arranged closer to the nozzle retaining element (100) than the supply area (220),
    the piston area (240) has a smaller internal diameter than the supply area (220),
    the supply channel (235) is arranged in the sheath of the supply area (220) and in the sheath of the piston area (240).
  5. Fuel injection valve according to Claim 4, characterized in that
    the intermediate piece (200) is configured as a hollow cylindrical supply sleeve (230),
    the supply channel (235) is arranged in the sheath of the supply sleeve (230).
EP99932634A 1998-05-07 1999-05-05 Fuel injection valve for internal combustion engines Expired - Lifetime EP1076771B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19820455 1998-05-07
DE19820455 1998-05-07
PCT/DE1999/001358 WO1999057433A2 (en) 1998-05-07 1999-05-05 Fuel injection valve for internal combustion engines

Publications (2)

Publication Number Publication Date
EP1076771A2 EP1076771A2 (en) 2001-02-21
EP1076771B1 true EP1076771B1 (en) 2004-03-17

Family

ID=7866993

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99932634A Expired - Lifetime EP1076771B1 (en) 1998-05-07 1999-05-05 Fuel injection valve for internal combustion engines

Country Status (4)

Country Link
US (1) US6354520B1 (en)
EP (1) EP1076771B1 (en)
DE (1) DE59908891D1 (en)
WO (1) WO1999057433A2 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE59905079D1 (en) * 1998-05-07 2003-05-22 Siemens Ag FUEL INJECTION VALVE FOR INTERNAL COMBUSTION ENGINES
DE19906383A1 (en) * 1999-02-16 2000-08-24 Siemens Ag Injector for an injection system of an internal combustion engine
DE10115214A1 (en) * 2001-03-28 2002-10-10 Bosch Gmbh Robert High-pressure fuel system for internal combustion engines
JP2006194173A (en) * 2005-01-14 2006-07-27 Denso Corp Fuel injection valve
US8205598B2 (en) * 2010-02-08 2012-06-26 International Engine Intellectual Property Company, Llc Fuel injector nozzle
CN102966476A (en) * 2012-12-04 2013-03-13 中国第一汽车股份有限公司无锡油泵油嘴研究所 Pressure-free chamber oil nozzle needle valve couple
JP6080087B2 (en) * 2014-02-28 2017-02-15 株式会社デンソー Fuel injection valve

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB962870A (en) * 1961-10-26 1964-07-08 Goetaverken Ab Improvements in or relating to fuel injectors for internal combustion engines
US3531052A (en) * 1968-02-19 1970-09-29 Clayton Dewandre Holdings Ltd Fuel injector for internal combustion engines
US4153205A (en) * 1977-10-19 1979-05-08 Allis-Chalmers Corporation Short seat fuel injection nozzle valve
JPS58128464A (en) 1982-01-27 1983-08-01 Nippon Soken Inc Fuel injection control device of internal-combustion engine
CH669822A5 (en) 1986-02-12 1989-04-14 Sulzer Ag
EP0363142A1 (en) * 1988-10-04 1990-04-11 LUCAS INDUSTRIES public limited company Fuel injection nozzles for internal combustion engines
US5522550A (en) * 1992-06-10 1996-06-04 Robert Bosch Gmbh Injection nozzle for internal combustion engines
DE4440369A1 (en) * 1994-11-11 1996-05-15 Bosch Gmbh Robert Fuel injection valve for IC engine
US5497743A (en) 1994-12-27 1996-03-12 Caterpillar Inc. Injector for separate control of flow and momentum
AUPN391295A0 (en) * 1995-06-30 1995-07-27 Orbital Engine Company (Australia) Proprietary Limited Fuel injection apparatus
DE29519296U1 (en) * 1995-12-06 1997-04-03 Bosch Gmbh Robert Fuel injection valve for internal combustion engines

Also Published As

Publication number Publication date
WO1999057433A2 (en) 1999-11-11
WO1999057433A3 (en) 1999-12-29
EP1076771A2 (en) 2001-02-21
US6354520B1 (en) 2002-03-12
DE59908891D1 (en) 2004-04-22

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