EP1114253A1 - Fuel injection valve and method for the production thereof - Google Patents

Fuel injection valve and method for the production thereof

Info

Publication number
EP1114253A1
EP1114253A1 EP00954299A EP00954299A EP1114253A1 EP 1114253 A1 EP1114253 A1 EP 1114253A1 EP 00954299 A EP00954299 A EP 00954299A EP 00954299 A EP00954299 A EP 00954299A EP 1114253 A1 EP1114253 A1 EP 1114253A1
Authority
EP
European Patent Office
Prior art keywords
valve
valve member
combustion chamber
fuel injection
bore
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.)
Withdrawn
Application number
EP00954299A
Other languages
German (de)
French (fr)
Inventor
Erguen Filiz
Dieter Niemeyer
Güngör Yurtseven
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1114253A1 publication Critical patent/EP1114253A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • F02M61/042—The valves being provided with fuel passages
    • 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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • 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

Definitions

  • the invention relates to a fuel injection valve for internal combustion engines, with a valve member which is axially displaceable in the guide bore of a valve body and has a valve sealing surface at its end on the combustion chamber side, which cooperates with a valve seat formed on the end of the guide bore on the combustion chamber side, in order to establish the connection between a high-pressure channel in the valve body and to control at least one injection opening, and with a control channel in the valve member, via which the high-pressure channel can be connected to a relief chamber when the valve member is lifted off the valve seat and which is formed by a blind bore extending from the combustion chamber end of the valve member.
  • Such a fuel injection valve is known from DE 196 23 581 AI.
  • the space between the valve member and the valve body above the valve seat and valve sealing surface acts as a throttle.
  • the throttle cross-section depends on the position of the valve member relative to the valve body.
  • the object of the invention is to provide a fuel injector with an improved To provide injection behavior that is simple and inexpensive to manufacture.
  • a method for producing a valve member for such a fuel injection valve is to be specified.
  • the task is in a Kraf material injection valve for internal combustion engines, with a valve member axially displaceable in a guide bore of a valve body, which has at its combustion chamber end a valve sealing surface with one at the combustion chamber end of
  • Guide bore formed valve seat cooperates to control the connection between a high-pressure channel in the valve body and at least one injection opening, and with a control channel in the valve member, via which the high-pressure channel can be connected to a relief chamber when the valve member is lifted from the valve seat and which is connected to the combustion chamber end of the valve member outgoing blind bore is formed, solved in that a throttle with a constant throttle cross section is formed in the combustion chamber end of the valve member.
  • the throttle has the advantage that the high pressure prevailing at the combustion chamber end of the valve member is slowly reduced when the injection valve is opened and closed. This avoids pressure surges that can damage the fuel injector. Otherwise, the invention provides
  • Fuel injection valve has the same advantages as the fuel injection valve described in DE 19S 23 581 AI.
  • a special embodiment of the invention is characterized in that a throttle bore is provided in the combustion chamber end of the valve member, which opens into the blind bore and whose diameter is significantly smaller than the diameter of the blind bore.
  • the diameter of the throttle bore is preferably 0.1 mm - 0.3 mm.
  • the throttle bore can be implemented simply and inexpensively according to the method specified below.
  • Another special embodiment of the invention is characterized in that the throttle bore extends axially in the valve member. This ensures that the space in the area of the injection openings is permanently connected to the relief space.
  • Another special embodiment of the invention is characterized in that the throttle bore extends obliquely to the longitudinal axis of the valve member and opens below a valve seat edge.
  • the arrangement of the orifice of the throttle bore below the edge of the valve seat ensures that the high-pressure channel is not connected to the relief chamber when the fuel injector is closed.
  • a valve member with a blind hole is closed at the end on the combustion chamber side by kneading / hammering in;
  • the method according to the invention has the advantage that it can be applied to the valve members of conventional fuel injection valves.
  • FIG. 1 shows a longitudinal section through a fuel injection valve according to a first
  • Figure 2 shows a longitudinal section through a
  • Figure 3 shows the free end of a valve member in the initial state
  • Figure 4 shows the valve member of Figure 3 after a first
  • Figure 5 shows the finished valve member according to the first embodiment
  • Figure 6 shows the finished valve member according to the second embodiment.
  • FIG. 1 In the first exemplary embodiment of the invention shown in FIG. 1
  • a piston-shaped valve member 1 is guided axially displaceably in a guide bore of a valve body 2.
  • the free end of the cylindrical valve body 2 projects into the combustion chamber (not shown) supplying internal combustion engine.
  • the valve body 2 rests on an intermediate disk which is adjoined by a spring chamber which serves to receive a return spring.
  • valve member 1 At its end on the combustion chamber side, valve member 1 has a valve sealing surface 3, which in the exemplary embodiment is designed as a conical sealing surface.
  • the valve surface 3 acts on the combustion chamber end of the
  • Valve body 2 formed valve seat surface 4 together, which is hollow-conical.
  • a valve seat edge 10 is formed on the valve sealing surface 3.
  • an injection opening 5 is provided, through which the fuel to be injected can get into the combustion chamber of the internal combustion engine.
  • a high-pressure channel 6 is formed between the valve body 2 and the valve member 1. The high-pressure channel 6 is connected via an injection line to a high-pressure fuel pump which supplies the fuel injection valve with fuel under high pressure.
  • a control channel 7 is provided in valve member 1 for a delayed opening stroke movement of valve member 1.
  • the control channel 7 enables a connection between the high-pressure channel 6 and one during the opening stroke movement of the valve member 1
  • a throttle bore 8 is formed at the end of the control channel 7 directed towards the injection opening 5.
  • the longitudinal axis of the throttle bore 8 coincides with the longitudinal axis of the control channel 7.
  • Throttle bore 8 is considerably smaller than the diameter the control channel 7.
  • the second embodiment of a fuel injection valve according to the invention shown in Figure 2 is similar to the embodiment shown in Figure 1.
  • the same reference numerals are used to designate the same parts. To avoid repetition, reference is made to the above description of FIG. 1.
  • the difference between the first and the second embodiment is that in the in
  • FIG. 2 shown second embodiment, an oblique throttle bore 9 is provided instead of an axial throttle bore.
  • the oblique throttle bore 9 opens into the valve sealing surface 3 below the valve seat edge 10.
  • the fuel injection valve according to the invention functions as follows: in the closed state, the valve member 1 is held by the return spring with its valve sealing surface 3 in contact with the valve seat surface 4. In this state, the injection opening 5 is closed off from the high-pressure duct 6.
  • Injection opening 5 in the combustion chamber of the internal combustion engine is a beneficial effect on the Preparation of the fuel in the combustion chamber.
  • the injection is ended in a known manner by a pressure drop in the high-pressure channel 6.
  • valve member 1 comes into contact with the valve seat surface 4.
  • part of the fuel flows out via the throttle bore 8 or 9 and the control channel 7, as a result of which the closing stroke speed is increased.
  • FIG. 3 shows a valve member 1 with a blind hole 11.
  • a valve member 1 can be used as an output part for producing a valve member according to the invention.
  • the open end of the blind hole 11 is closed by kneading and piercing, as can be seen in FIG.
  • the free end 12 of the valve member 1 is tapered with a valve seat edge 10.
  • the valve member shown in FIG. 4 is drilled out at the closed end.
  • FIGS. 5 and 6 show that, depending on the machining direction of the drilling tool, different throttle bores 8 and 9 can be made at the free end 12 of the valve member 1.
  • the re-drilling at the free end 12 of the valve member 1 is carried out with a drill diameter of 0.1 mm - 0.3 mm.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

The invention relates to a fuel injection valve for internal combustion engines comprising a valve member (1) that can be axially displaced in a guide hole in a valve body (2). Said valve member has a valve sealing surface (3) on the combustion chamber side cooperating with a valve seat (4) formed on the combustion chamber side of the guide hole in order to control the connection between a high pressure channel (6) in the valve body (2) and at least one injection port (5). Said valve member (1) also has a control channel (7) by means of which the high pressure channel (6) can be connected to a relief chamber when the valve member (1) is lifted from the valve seat (4) and is formed by a blind pocket extending from the combustion chamber side of the valve member (1). In order to improve the injection ratio of the fuel injection valve, a choke (8) having a constant throttle cross section is formed on the combustion chamber side of the valve member (1).

Description

KRAFTSTOFFEINSPRITZVENTIL UND VERFAHREN ZU DESSEN HERSTELLUNGFUEL INJECTION VALVE AND METHOD FOR THE PRODUCTION THEREOF
Stand der TechnikState of the art
Die Erfindung betrifft ein Kraftstoffeinspritzventil für Brennkraftmaschinen, mit einem in einer in Führungsbohrung eines Ventilkörpers axial verschiebbaren Ventilglied, das an seinem brennraumseitigen Ende eine Ventildichtfläche aufweist, die mit einem am brennraumseitigen Ende der Führungsbohrung gebildeten Ventilsitz zusammenwirkt, um die Verbindung zwischen einem Hochdruckkanal im Ventilkörper und wenigstens einer Einspritzöffnung zu steuern, und mit einem Absteuerkanal im Ventilglied, über den der Hochdruckkanal bei vom Ventilsitz abgehobenem Ventilglied mit einem Entlastungsraum verbindbar ist und der durch eine vom brennraumseitigen Ende des Ventilgliedes ausgehende Sackbohrung gebildet ist.The invention relates to a fuel injection valve for internal combustion engines, with a valve member which is axially displaceable in the guide bore of a valve body and has a valve sealing surface at its end on the combustion chamber side, which cooperates with a valve seat formed on the end of the guide bore on the combustion chamber side, in order to establish the connection between a high-pressure channel in the valve body and to control at least one injection opening, and with a control channel in the valve member, via which the high-pressure channel can be connected to a relief chamber when the valve member is lifted off the valve seat and which is formed by a blind bore extending from the combustion chamber end of the valve member.
Ein derartiges Kraftstoffeinspritzventil ist aus der DE 196 23 581 AI bekannt. Bei dem bekannten Kraftstoffeinspritzventil wirkt der Zwischenraum zwischen dem Ventilglied und dem Ventilkörper oberhalb von Ventilsitz und Ventildichtfläche als Drossel. Der Drosselquerschnitt ist abhängig von der Position des Ventilgliedes relativ zu dem Ventilkörper.Such a fuel injection valve is known from DE 196 23 581 AI. In the known fuel injection valve, the space between the valve member and the valve body above the valve seat and valve sealing surface acts as a throttle. The throttle cross-section depends on the position of the valve member relative to the valve body.
Aufgabe ist der Erfindung ist es, ein Kraftstoffeinspritzventil mit einem verbesserten Einspritzverhalten bereitzustellen, das einfach aufgebaut und kostengünstig herstellbar ist. Außerdem soll ein Verfahren zur Herstellung eines Ventilgliedes für ein derartiges Kraftstoffeinspritzventil angegeben werden.The object of the invention is to provide a fuel injector with an improved To provide injection behavior that is simple and inexpensive to manufacture. In addition, a method for producing a valve member for such a fuel injection valve is to be specified.
Die Aufgabe ist bei einem Kraf stoffeinspritzventil für Brennkraftmaschinen, mit einem in einer Führungsbohrung eines Ventilkörpers axial verschiebbaren Ventilgliedes, das an seinem brennraumseitigen Ende eine Ventildichtfläche aufweist, die mit einem am brennraumseitigen Ende derThe task is in a Kraf material injection valve for internal combustion engines, with a valve member axially displaceable in a guide bore of a valve body, which has at its combustion chamber end a valve sealing surface with one at the combustion chamber end of
Führungsbohrung gebildeten Ventilsitz zusammenwirkt, um die Verbindung zwischen einem Hochdruckkanal im Ventilkörper und wenigstens einer Einspritzöffnung zu steuern, und mit einem Absteuerkanal im Ventilglied, über den der Hochdruckkanal bei vom Ventilsitz abgehobenem Ventilglied mit einem Entlastungsraum verbindbar ist und der durch eine vom brennraumseitigen Ende des Ventilgliedes ausgehende Sackbohrung gebildet ist, dadurch gelöst, dass in dem brennraumseitigen Ende des Ventilgliedes eine Drossel mit konstantem Drosselquerschnitt ausgebildet ist. Die Drossel liefert den Vorteil, dass der am brennraumseitigen Ende des Ventilglieds herrschende Hochdruck beim Öffnen und Schließen des Einspritzventils langsam abgebaut wird. Dadurch werden Druckstöße, die zu Beschädigungen des Kraftstoffeinspritzventils führen können, vermieden. Ansonsten liefert das erfindungsgemäßeGuide bore formed valve seat cooperates to control the connection between a high-pressure channel in the valve body and at least one injection opening, and with a control channel in the valve member, via which the high-pressure channel can be connected to a relief chamber when the valve member is lifted from the valve seat and which is connected to the combustion chamber end of the valve member outgoing blind bore is formed, solved in that a throttle with a constant throttle cross section is formed in the combustion chamber end of the valve member. The throttle has the advantage that the high pressure prevailing at the combustion chamber end of the valve member is slowly reduced when the injection valve is opened and closed. This avoids pressure surges that can damage the fuel injector. Otherwise, the invention provides
Kraftstoffeinspritzventil die gleichen Vorteile wie das in der DE 19S 23 581 AI beschriebene Kraftstoffeinspritzventil .Fuel injection valve has the same advantages as the fuel injection valve described in DE 19S 23 581 AI.
Eine besondere Ausführungsart der Erfindung ist dadurch gekennzeichnet, dass in dem brennraumseitigen Ende des Ventilgliedes eine Drosselbohrung vorgesehen ist, die in die Sackbohrung mündet und deren Druchmesser deutlich kleiner als der Durchmesser der Sackbohrung ist. Der Durchmesser der Drosselbohrung beträgt vorzugsweise 0,1 mm - 0,3 mm. Die Drosselbohrung kann gemäß dem weiter unten angegebenen Verfahren einfach und kostengünstig realisiert werden.A special embodiment of the invention is characterized in that a throttle bore is provided in the combustion chamber end of the valve member, which opens into the blind bore and whose diameter is significantly smaller than the diameter of the blind bore. The diameter of the throttle bore is preferably 0.1 mm - 0.3 mm. The throttle bore can be implemented simply and inexpensively according to the method specified below.
Eine weitere besondere Ausführungsart der Erfindung ist dadurch gekennzeichnet, dass die Drosselbohrung axial in dem Ventilglied verläuft. Dadurch ist gewährleistet, dass der Raum im Bereich der Einspritzöffnungen dauernd mit dem Entlastungsraum in Verbindung steht.Another special embodiment of the invention is characterized in that the throttle bore extends axially in the valve member. This ensures that the space in the area of the injection openings is permanently connected to the relief space.
Eine weitere besondere Ausführungsart der Erfindung ist dadurch gekennzeichnet, dass die Drosselbohrung schräg zur Längsachse des Ventilgliedes verläuft und unterhalb einer Ventilsitzkante mündet. Durch die Anordnung der Mündung der Drosselbohrung unterhalb der Ventilsitzkante ist gewährleistet, dass der Hochdruckkanal im geschlossenen Zustand des Kraftstoffeinspritzventils nicht mit dem Entlastungsraum in Verbindung steht.Another special embodiment of the invention is characterized in that the throttle bore extends obliquely to the longitudinal axis of the valve member and opens below a valve seat edge. The arrangement of the orifice of the throttle bore below the edge of the valve seat ensures that the high-pressure channel is not connected to the relief chamber when the fuel injector is closed.
Bei einem Verfahren zur Herstellung eines Ventilgliedes für das vorab beschriebene Kraftstoffeinspritzventil ist die oben angegebene Aufgabe durch die folgenden Verfahrensschritte gelöst:In a method for producing a valve member for the fuel injection valve described above, the above-mentioned object is achieved by the following method steps:
a) Ein Ventilglied mit einem Sackloch wird an dem brennraumseitigen Ende durch Rundkneten/Einstichhämmern verschlossen;a) A valve member with a blind hole is closed at the end on the combustion chamber side by kneading / hammering in;
b) durch Bohren wird eine Verbindung zu dem Sackloch in dem Ventilglied hergestellt.b) a connection is made to the blind hole in the valve member by drilling.
Das erfindungsgemäße Verfahren hat den Vorteil, dass es auf die Ventilglieder herkömmlicher Kraftstoffeinspritzventile angewendet werden kann.The method according to the invention has the advantage that it can be applied to the valve members of conventional fuel injection valves.
Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung, in der unter Bezugnahme auf die Zeichnung verschiedene Ausführungsbeispiele der Erfindung im Einzelnen beschrieben sind. Dabei können die in den Ansprüchen und in der Beschreibung erwähnten Merkmale jeweils einzeln für sich oder in beliebiger Kombination erfindungswesentlich sein. In der Zeichnung zeigen:Further advantages, features and details of the invention result from the following description, in which various exemplary embodiments of the invention are described in detail with reference to the drawing. The features mentioned in the claims and in the description can each be essential to the invention individually or in any combination. The drawing shows:
Figur 1 einen Längsschnitt durch ein Kraftstoffeinspritzventil gemäß einer ersten1 shows a longitudinal section through a fuel injection valve according to a first
Ausführungsform;embodiment;
Figur 2 einen Längsschnitt durch einFigure 2 shows a longitudinal section through a
Kraftstoffeinspritzventil gemäß einer zweiten Ausführungsform;Fuel injection valve according to a second embodiment;
Figur 3 das freie Ende eines Ventilgliedes im Ausgangszustand;Figure 3 shows the free end of a valve member in the initial state;
Figur 4 das Ventilglied aus Figur 3 nach einer erstenFigure 4 shows the valve member of Figure 3 after a first
Bearbeitungsstufe ;Processing stage;
Figur 5 das fertig bearbeitete Ventilglied gemäß der ersten Ausführungsform; undFigure 5 shows the finished valve member according to the first embodiment; and
Figur 6 das fertig bearbeitete Ventilglied gemäß der zweiten Ausführungsform.Figure 6 shows the finished valve member according to the second embodiment.
Bei dem in der Figur 1 dargestellten ersten Ausführungsbeispiel des erfindungsgemäßenIn the first exemplary embodiment of the invention shown in FIG. 1
Kraftstoffeinspritzventils für Brennkraftmaschinen ist ein kolbenförmiges Ventilglied 1 in einer Führungsbohrung eines Ventilkörpers 2 axial verschiebbar geführt. Der zylinderförmige Ventilkörper 2 ragt dabei mit seinem freien Ende in den nicht näher dargestellten Brennraum der zu versorgenden Brennkraftmaschine. Mit seinem anderen, als flache Stirnfläche ausgebildeten Ende, liegt der Ventilkörper 2 an einer Zwischenscheibe an, an die sich ein Federraum anschließt, der zur Aufnahme einer Rückstellfeder dient .Fuel injection valve for internal combustion engines, a piston-shaped valve member 1 is guided axially displaceably in a guide bore of a valve body 2. The free end of the cylindrical valve body 2 projects into the combustion chamber (not shown) supplying internal combustion engine. With its other end, which is designed as a flat end face, the valve body 2 rests on an intermediate disk which is adjoined by a spring chamber which serves to receive a return spring.
An seinem brennraumseitigen Ende weist das Ventilglied 1 eine Ventildichtfläche 3 auf, die im Ausführungsbeispiel als konische Dichtfläche ausgebildet ist. Die Ventilfläche 3 wirkt mit einer am brennraumseitigen Ende desAt its end on the combustion chamber side, valve member 1 has a valve sealing surface 3, which in the exemplary embodiment is designed as a conical sealing surface. The valve surface 3 acts on the combustion chamber end of the
Ventilkörpers 2 ausgebildeten Ventilsitzfläche 4 zusammen, die hohlkegelförmig ausgebildet ist. An der Ventildichtfläche 3 ist eine Ventilsitzkante 10 ausgebildet .Valve body 2 formed valve seat surface 4 together, which is hollow-conical. A valve seat edge 10 is formed on the valve sealing surface 3.
An der Spitze des Ventilkörpers 2 ist eine Einspritzöffnung 5 vorgesehen, durch die der einzuspritzende Kraftstoff in den Brennraum der Brennkraftmaschine gelangen kann. Zwischen dem Ventilkörper 2 und dem Ventilglied 1 ist ein Hochdruckkanal 6 ausgebildet. Der Hochdruckkanal 6 steht über einer Einspritzleitung mit einer Kraftstoffhochdruckpumpe in Verbindung, die das Kraftstoffeinspritzventil mit unter hohem Druck stehenden Kraftstoff versorgt.At the tip of the valve body 2, an injection opening 5 is provided, through which the fuel to be injected can get into the combustion chamber of the internal combustion engine. A high-pressure channel 6 is formed between the valve body 2 and the valve member 1. The high-pressure channel 6 is connected via an injection line to a high-pressure fuel pump which supplies the fuel injection valve with fuel under high pressure.
Für eine verzögerte Öffnungshubbewegung des Ventilgliedes 1 ist in dem Ventilglied 1 ein Absteuerkanal 7 vorgesehen. Der Absteuerkanal 7 ermöglicht während der Öffnungshubbewegung des Ventilgliedes 1 eine Verbindung zwischen dem Hochdruckkanal 6 und einemA control channel 7 is provided in valve member 1 for a delayed opening stroke movement of valve member 1. The control channel 7 enables a connection between the high-pressure channel 6 and one during the opening stroke movement of the valve member 1
Druckentlastungsraum. An dem zu der Einspritzδffnung 5 gerichteten Ende des Absteuerkanals 7 ist eine Drosselbohrung 8 ausgebildet. Die Längsachse der Drosselbohrung 8 fällt mit der Längsachse des Absteuerkanals 7 zusammen. Der Durchmesser derPressure relief chamber. A throttle bore 8 is formed at the end of the control channel 7 directed towards the injection opening 5. The longitudinal axis of the throttle bore 8 coincides with the longitudinal axis of the control channel 7. The diameter of the
Drosselbohrung 8 ist erheblich kleiner als der Druch esser des Absteuerkanals 7.Throttle bore 8 is considerably smaller than the diameter the control channel 7.
Die in Figur 2 dargestellte zweite Ausführungsform eines erfindungsgemäßen Kraftstoffeinspritzventils ähnelt der in Figur 1 dargestellten Ausführungsform. Der Einfachheit halber werden zur Bezeichnung gleicher Teile dieselben Bezugszeichen verwendet. Um Wiederholungen zu vermeiden, wird auf die vorstehende Beschreibung der Figur 1 verwiesen. Der Unterschied zwischen der ersten und der zweiten Ausführungsform besteht darin, dass bei der inThe second embodiment of a fuel injection valve according to the invention shown in Figure 2 is similar to the embodiment shown in Figure 1. For the sake of simplicity, the same reference numerals are used to designate the same parts. To avoid repetition, reference is made to the above description of FIG. 1. The difference between the first and the second embodiment is that in the in
Figur 2 dargestellten zweiten Ausführungsform statt einer axialen Drosselbohrung eine schräg verlaufende Drosselbohrung 9 vorgesehen ist. Die schräg verlaufende Drosselbohrung 9 mündet in der Ventildichtfläche 3 unterhalb der Ventilsitzkante 10.Figure 2 shown second embodiment, an oblique throttle bore 9 is provided instead of an axial throttle bore. The oblique throttle bore 9 opens into the valve sealing surface 3 below the valve seat edge 10.
Das erfindungsgemäße Kraftstoffeinspritzventil funktioniert wie folgt: Im geschlossenen Zustand wird das Ventilglied 1 durch die Rückstellfeder mit seiner Ventildichtfläche 3 in Anlage an der Ventilsitzfläche 4 gehalten. In diesem Zustand ist die Einspritzöffnung 5 gegenüber dem Hochdruckkanal 6 verschlossen.The fuel injection valve according to the invention functions as follows: in the closed state, the valve member 1 is held by the return spring with its valve sealing surface 3 in contact with the valve seat surface 4. In this state, the injection opening 5 is closed off from the high-pressure duct 6.
Mit Beginn der Einspritzphase gelangt von der Hochdruckpumpe geförderter Kraftstoff in den Hochdruckkanal 6 und hebt das Ventilglied 1 entgegen der Kraft der Rückstellfeder von der Ventilsitzfläche 4 ab. Daraufhin gelangt der unter hohem Druck stehende Kraftstoff über den aufgesteuerten Durchflussquerschnitt zwischen der Ventildichtfläche 3 und der Ventilsitzfläche 4 über dieAt the beginning of the injection phase, fuel delivered by the high-pressure pump enters the high-pressure channel 6 and lifts the valve member 1 against the force of the return spring from the valve seat surface 4. Thereupon the fuel under high pressure passes through the controlled flow cross-section between the valve sealing surface 3 and the valve seat surface 4 via the
Einspritzöffnung 5 in den Brennraum der Brennkraftmaschine. Während der Öffnungshubbewegung des Ventilgliedes 1 strömt ein Teil des Kraftstoffs über die Drosselbohrung 8 bzw. 9 und den Absteuerkanal 7 in den Druckentlastungsraum. Dadurch wird die Öffnungshubbewegung des Ventilgliedes 1 verzögert . Diese Verzögerung wirkt sich vorteilhaft auf die Aufbereitung des Kraftstoffs im Brennraum aus.Injection opening 5 in the combustion chamber of the internal combustion engine. During the opening stroke movement of the valve member 1, part of the fuel flows through the throttle bore 8 or 9 and the control channel 7 into the pressure relief chamber. As a result, the opening stroke movement of the valve member 1 is delayed. This delay has a beneficial effect on the Preparation of the fuel in the combustion chamber.
Mit Erreichen der maximalen Öffnungshublage des Ventilgliedes 1 wird der den Absteuerkanal 7 mit dem Druckentlastungsraum verbindende Durchflussquerschnitt verschlossen, so dass die gesamte geförderte Kraftstoffmenge zur Einspritzung in den Brennraum gelangt.When the maximum opening stroke position of the valve member 1 is reached, the flow cross section connecting the control channel 7 to the pressure relief chamber is closed, so that the entire quantity of fuel delivered reaches the combustion chamber for injection.
Die Einspritzung wird in bekannter Weise durch ein Druckabfall im Hochdruckkanal 6 beendet. Durch dieThe injection is ended in a known manner by a pressure drop in the high-pressure channel 6. Through the
Vorspannkraft der Rückstellfeder kommt das Ventilglied 1 wieder in Anlage an der Ventilsitzfläche 4. Während der Schließhubbewegung des Ventilglieds 1 strömt ein Teil des Kraftstoffs über die Drosselbohrung 8 bzw. 9 und den Absteuerkanal 7 ab, wodurch die Schließhubgeschwindigkeit erhöht wird.Biasing force of the return spring, the valve member 1 comes into contact with the valve seat surface 4. During the closing stroke movement of the valve member 1, part of the fuel flows out via the throttle bore 8 or 9 and the control channel 7, as a result of which the closing stroke speed is increased.
In Figur 3 sieht man ein Ventilglied 1 mit einem Sackloch 11. Ein derartiges Ventilglied 1 kann als Ausgangsteil zur Herstellung eines erfindungsgemäßen Ventilgliedes verwendet werden. Durch Rundkneten und Einstechhämmern wird das offene Ende des Sacklochs 11 verschlossen, wie in Figur 4 zu sehen ist. Außerdem wird das freie Ende 12 des Ventilgliedes 1 spitz zulaufend mit einer Ventilsitzkante 10 ausgebildet. In einem weiteren Bearbeitungsschritt wird das in Figur 4 dargestellte Ventilglied an dem geschlossen Ende aufgebohrt .FIG. 3 shows a valve member 1 with a blind hole 11. Such a valve member 1 can be used as an output part for producing a valve member according to the invention. The open end of the blind hole 11 is closed by kneading and piercing, as can be seen in FIG. In addition, the free end 12 of the valve member 1 is tapered with a valve seat edge 10. In a further processing step, the valve member shown in FIG. 4 is drilled out at the closed end.
In den Figuren 5 und 6 ist dargestellt, dass sich, je nach Bearbeitungsrichtung des Bohrwerkzeuges, verschiedene Drosselbohrungen 8 und 9 an dem freien Ende 12 des Ventilgliedes 1 anbringen lassen. Das Nachbohren an dem freien Ende 12 des Ventilgliedes 1 erfolgt mit einem Bohrerdurchmesser von 0,1 mm - 0,3 mm. FIGS. 5 and 6 show that, depending on the machining direction of the drilling tool, different throttle bores 8 and 9 can be made at the free end 12 of the valve member 1. The re-drilling at the free end 12 of the valve member 1 is carried out with a drill diameter of 0.1 mm - 0.3 mm.

Claims

Ansprüche Expectations
1. Kraftstoffeinspritzventil für Brennkraftmaschinen, mit einem in einer Führungsbohrung eines Ventilkörpers (2) axial verschiebbaren Ventilglied (1) , das an seinem brennraumseitigen Ende eine Ventildichtfläche (3) aufweist, die mit einem am brennraumseitigen Ende der Führungsbohrung gebildeten Ventilsitz (4) zusammenwirkt, um die Verbindung zwischen einem Hochdruckkanal (6) im Ventilkörper (2) und wenigstens einer Einspritzöffnung (5) zu steuern, und mit einem Absteuerkanal (7) im Ventilglied (1) , über den der Hochdruckkanal (6) bei vom Ventilsitz (4) abgehobenem Ventilglied (1) mit einem Entlastungsraum verbindbar ist und der durch eine vom brennraumseitigen Ende des Ventilgliedes (1) ausgehende Sackbohrung gebildet ist, dadurch gekennzeichnet, dass in dem brennraumseitigen Ende des Ventilgliedes (1) eine Drossel (8, 9) mit konstantem Drosselquerschnitt ausgebildet ist.1.Fuel injection valve for internal combustion engines, with a valve member (1) which is axially displaceable in a guide bore of a valve body (2) and has a valve sealing surface (3) at its combustion chamber end, which cooperates with a valve seat (4) formed at the combustion chamber end of the guide bore, to control the connection between a high-pressure channel (6) in the valve body (2) and at least one injection opening (5), and with a control channel (7) in the valve member (1), via which the high-pressure channel (6) at the valve seat (4) lifted valve member (1) can be connected to a relief chamber and which is formed by a blind bore extending from the combustion chamber end of the valve member (1), characterized in that in the combustion chamber end of the valve member (1) a throttle (8, 9) with a constant throttle cross section is trained.
2. Kraftstoffeinspritzventil nach Anspruch 1, dadurch gekennzeichnet, dass in dem brennraumseitigen Ende des Ventilgliedes (1) eine Drosselbohrung (8, 9) vorgesehen ist, die in die Sackbohrung (7) mündet und deren2. Fuel injection valve according to claim 1, characterized in that a throttle bore (8, 9) is provided in the combustion chamber end of the valve member (1), which opens into the blind bore (7) and the latter
Durchmesser deutlich kleiner als der Durchmesser der Sackbohrung (7) ist.Diameter is significantly smaller than the diameter of the blind bore (7).
3. Kraftstoffeinspritzventil nach Anspruch 2, dadurch gekennzeichnet, dass die Drosselbohrung (8) axial in dem Ventilglied (1) verläuft. 3. Fuel injection valve according to claim 2, characterized in that the throttle bore (8) extends axially in the valve member (1).
4. Kraftstoffeinspritzventil nach Anspruch 2, dadurch gekennzeichnet, dass die Drosselbohrung (9) schräg zur Längsachse des Ventilgliedes (1) verläuft und unterhalb einer Ventilsitzkante (10) mündet.4. Fuel injection valve according to claim 2, characterized in that the throttle bore (9) extends obliquely to the longitudinal axis of the valve member (1) and opens below a valve seat edge (10).
5. Verfahren zur Herstellung eines Ventilgliedes (1) für ein Kraftstoffeinspritzventil nach einem der vorhergehenden Ansprüche, gekennzeichnet durch die folgenden Verfahrensschritte :5. A method for producing a valve member (1) for a fuel injection valve according to one of the preceding claims, characterized by the following method steps:
a) Ein Ventilglied (1) mit einem Sackloch (11) wird an den brennraumseitigen Ende durch Rundkneten/Einstichhämmern verschlossen;a) A valve member (1) with a blind hole (11) is closed at the end on the combustion chamber side by kneading / hammering;
b) Durch Bohren wird eine Verbindung (8, 9) zu demb) A connection (8, 9) to the
Sackloch (11) in dem Ventilglied (1) hergestellt. Blind hole (11) made in the valve member (1).
EP00954299A 1999-07-07 2000-07-05 Fuel injection valve and method for the production thereof Withdrawn EP1114253A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19931274A DE19931274A1 (en) 1999-07-07 1999-07-07 Fuel injector
DE19931274 1999-07-07
PCT/DE2000/002134 WO2001004489A1 (en) 1999-07-07 2000-07-05 Fuel injection valve and method for the production thereof

Publications (1)

Publication Number Publication Date
EP1114253A1 true EP1114253A1 (en) 2001-07-11

Family

ID=7913896

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Application Number Title Priority Date Filing Date
EP00954299A Withdrawn EP1114253A1 (en) 1999-07-07 2000-07-05 Fuel injection valve and method for the production thereof

Country Status (7)

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EP (1) EP1114253A1 (en)
JP (1) JP2003504553A (en)
BR (1) BR0006904A (en)
CZ (1) CZ2001805A3 (en)
DE (1) DE19931274A1 (en)
SK (1) SK2892001A3 (en)
WO (1) WO2001004489A1 (en)

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JP4710785B2 (en) * 2006-10-03 2011-06-29 トヨタ自動車株式会社 Fuel injection nozzle for internal combustion engine

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Publication number Priority date Publication date Assignee Title
DE1817471A1 (en) * 1968-01-01 1969-08-14 British Internal Comb Engine R Fuel injection device for internal combustion engines
US5647536A (en) * 1995-01-23 1997-07-15 Cummins Engine Company, Inc. Injection rate shaping nozzle assembly for a fuel injector
DE19623581A1 (en) * 1995-07-21 1997-01-23 Bosch Gmbh Robert Fuel injection valve for IC engine
US5765755A (en) * 1997-01-23 1998-06-16 Cummins Engine Company, Inc. Injection rate shaping nozzle assembly for a fuel injector

Non-Patent Citations (1)

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Title
See references of WO0104489A1 *

Also Published As

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DE19931274A1 (en) 2001-01-25
SK2892001A3 (en) 2001-12-03
JP2003504553A (en) 2003-02-04
CZ2001805A3 (en) 2001-12-12
BR0006904A (en) 2001-06-12
WO2001004489A1 (en) 2001-01-18

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