EP0578963A1 - Fuel injection system - Google Patents

Fuel injection system Download PDF

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Publication number
EP0578963A1
EP0578963A1 EP93108991A EP93108991A EP0578963A1 EP 0578963 A1 EP0578963 A1 EP 0578963A1 EP 93108991 A EP93108991 A EP 93108991A EP 93108991 A EP93108991 A EP 93108991A EP 0578963 A1 EP0578963 A1 EP 0578963A1
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EP
European Patent Office
Prior art keywords
fuel
fuel injection
injection device
receiving bore
flow
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Withdrawn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
EP93108991A
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German (de)
French (fr)
Inventor
Matthias Entenmann
Stefan Meyer
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
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0578963A1 publication Critical patent/EP0578963A1/en
Withdrawn legal-status Critical Current

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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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
    • F02M69/462—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down
    • 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
    • F02M61/165—Filtering elements specially adapted in fuel inlets to injector
    • 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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/04—Injectors peculiar thereto
    • 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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
    • 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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
    • F02M69/54—Arrangement of fuel pressure regulators

Definitions

  • the invention relates to a fuel injection device according to the preamble of the main claim.
  • a fuel injection device is already known (Bosch, technical information: Mono-Jetronic, 1st edition 6/91, page 24), in which at least one flow opening is formed between the fuel supply duct and the fuel discharge duct outside the fuel injection valve, through which fuel flows and through which, for example degassing of the supplied fuel takes place before entry into the fuel injection valve, but it cannot be prevented that foreign bodies which are also flushed in the fuel and which arise, for example, during assembly of the fuel lines, pass through the flow opening into the fuel discharge duct and from there into the pressure regulator, where they cause disturbances in the pressure control.
  • the fuel injector according to the invention with the characterizing features of the main claim has the advantage that, despite the fuel injector and the This enables degassing of the fuel to be avoided, so that foreign bodies carried in the fuel cause disturbances in the pressure control. This is achieved in that from a size dependent on the design of the flow openings, foreign bodies cannot pass through them.
  • FIG. 1 shows a longitudinal section of a fuel injection device
  • FIGS. 2 and 3 each show further exemplary embodiments of the invention.
  • 1 denotes a fuel injection device which is placed on a throttle valve connector, designated 2, of an air intake pipe of a mixture-compressing, spark-ignited internal combustion engine.
  • the cross section of the throttle valve body 2 can be controlled by a throttle valve which is not shown in FIG. 1 and can be actuated in a known manner, so that more or less air can flow to the internal combustion engine via the throttle valve body 2 in the direction of the arrows 3.
  • the fuel injection device 1 has a carrier body 4, which is placed upstream of the throttle valve on the throttle valve connector 2 and at least one Has web part 5, which projects into a flow cross section 8 of the throttle valve connector 2.
  • the web part 5 has, at its end projecting into the flow cross section 8, a stepped receiving bore 9, into which a fuel injection valve 10 is inserted concentrically with the flow cross section 8 of the throttle valve connector 2 and via the mouthpiece 11 of which fuel can be sprayed off in the direction of the arrows 3.
  • a fuel injection valve 10 is inserted concentrically with the flow cross section 8 of the throttle valve connector 2 and via the mouthpiece 11 of which fuel can be sprayed off in the direction of the arrows 3.
  • Averted from the mouthpiece 11, the receiving bore 9 in the carrier body 4 is covered by a covering 12 which is fastened to the web part 5 by means of a screw 13.
  • a fuel supply duct 17 and a fuel discharge duct 18 running in the web part 5 each open into a fuel chamber 16 formed by the receiving bore 9 and the fuel injection valve 10.
  • the fuel supply duct 17 is connected to an intermediate space 19 formed in the carrier body 4, into which a connecting duct 20 opens, via which the fuel supply the fuel injector 1.
  • Fuel openings of the fuel injector 10, not shown in the drawing, through which fuel can flow from the fuel chamber 16 into the interior of the fuel injector 10, or can flow out of the interior of the fuel injector 10 into the fuel chamber 16, are surrounded by sieve bodies 23 and 24, which Prevent the penetration of foreign bodies flushed in the fuel into the interior of the fuel injection valve 10 and of which the screen body 23 lies approximately in the area of the mouths of the fuel supply channel 17 and fuel discharge channel 18 and the screen body 24 close to the mouthpiece 11.
  • a one-piece screen body is formed between the fuel chamber 16 and the fuel injection valve 10, which also covers the fuel openings for the inflowing and outflowing fuel and prevents the ingress of foreign bodies into the interior of the fuel injection valve 10.
  • At least one flow opening 25 is formed within the fuel chamber 16 between the fuel supply duct 17 and the fuel discharge duct 18, via which fuel can flow from upstream of the at least one flow opening 25 outside the fuel injection valve 10 downstream into the upper part 21 of the fuel chamber 16 and through which, for example, a degassing of the Fuel.
  • fuel flows through the fuel discharge channel 18 running in the web part 5 into an equalizing chamber 27 of a pressure regulator 26, which is delimited by a membrane 28, the periphery of which rests on a shoulder 29, against which it is supported by an annular flange 30 a cover 33 is pressed on which a clamping ring 34 engages, which is fastened to the carrier body 4 with the aid of screws (not shown in the drawing).
  • the cover 33 encloses an air chamber 35 which is separated from the compensation chamber 27 by the membrane 28.
  • An insert body 36 penetrates the membrane 28 and is positively connected to a spring plate 37, on which a spring 38 is supported, which on the other hand engages the cover 33.
  • a ball 40 is rotatably supported, which is held in the cone 39 by a retaining washer 42 and is integrally connected to a valve disk 43 which is connected to the membrane 28 and the parts 36, 37, 38, 40 and 42 forms the movable valve part of the pressure regulator 26.
  • a valve seat 45 is formed on a valve seat body 46, which is partially inserted into the compensation chamber 27 and protrudes into a fastening bore 47 in the support body 4, for example, is screwed or pressed in.
  • the flow opening 25 is designed in such a way that foreign bodies which are also flushed in the fuel are retained on the flow opening 25 from a size dependent on the design thereof.
  • the flow opening 25 is formed in the form of an annular gap 31 by the radial distance between a lower edge 51 of the sieve body 23 and the wall of the receiving bore 9.
  • FIG. 1 A further exemplary embodiment of the invention is shown in FIG.
  • the parts that are the same and have the same name as in the exemplary embodiment according to FIG. 1 are identified by the same reference numerals.
  • the flow opening 25 can be formed not only by the annular gap 31 shown in dashed lines in FIG. 2, but also by individual cutouts 32 which are formed, for example, in an edge 51 of the screen body 23 arranged around the injection valve 10.
  • the flow opening 25 can also be formed by a combination of the annular gap 31 and cutouts 32.
  • the recesses 32 can be formed by holes in the edge 51 of the screen body 23 which are opened or closed towards the periphery of the edge 51.
  • the edge 51 can also assume a gear-shaped configuration.
  • each recesses 32 be formed in the wall of the receiving bore 9, as shown in dotted lines in Figure 2.
  • the free cross section of each recess 32 can have any shape, such as circular, oval, rectangular, trapezoidal and others.
  • the number of recesses 32 formed is determined by the amount of fuel that the fuel injector 10 is to flow around as desired.
  • the annular gap 31 forming the flow opening 25 has a radial width 44 which is at most the same size how the opening diameter 49 of the return bore 48 of the pressure regulator 26 is, and the flow openings 25 formed by recesses 32, possibly including an annular gap 31, have dimensions such as a greatest depth 52 in the radial direction starting from the wall of the receiving bore 9 and a greatest circumferential direction Width 53, which are at most the same size as the opening diameter 49 of the return bore 48 of the pressure regulator 26.
  • FIG. 1 Another exemplary embodiment is shown in FIG.
  • the parts which remain the same and have the same effect as in the exemplary embodiment according to FIGS. 1 and 2 are identified by the same reference numerals.
  • the flow openings 25 are formed as recesses 32 in a separate annular body 54 arranged between the wall of the receiving bore 9 and the strainer body 23 or directly on the circumference of the fuel injection valve 10, with dimensions that are at most the same size as the opening diameter 49 of the return bore 48 of the pressure regulator 26 are.
  • the shape of the cutouts 32 corresponds to the shapes described in FIG. 2. In Figure 3 annular recesses are shown.
  • the ring body 54 is made with a radially extending filter material 55 provided, which at least retains all foreign bodies that are larger than the opening diameter 49 of the return bore 48 of the pressure regulator 26.
  • a radially extending filter material 55 provided, which at least retains all foreign bodies that are larger than the opening diameter 49 of the return bore 48 of the pressure regulator 26.
  • an additional annular gap 31 can also be provided between the circumference of the ring body 54 and the wall of the receiving bore 9 in the exemplary embodiments according to FIG Pressure regulator 26 is.

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

Abstract

In a known fuel injection device, in which fuel and foreign bodies can pass through a flow orifice arranged between fuel feed passage and fuel outlet passage outside the fuel injection valve and through which, for example, degassing of the fuel occurs before entering the fuel injection valve, the foreign bodies entrained in the fuel can cause faults in the pressure control. <??>By a suitable choice of the dimensions for the flow orifice (25), which is provided between a strainer body (23) of the fuel injection valve (10) and the wall of a receiving bore (9), foreign bodies are prevented from getting into the pressure regulator. <??>The fuel injection device is used in fuel injection systems for mixture-compressing internal combustion engines with applied ignition. <IMAGE>

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einer Brennstoffeinspritzvorrichtung nach der Gattung des Hauptanspruchs. Es ist schon eine Brennstoffeinspritzvorrichtung bekannt (Bosch, Technische Unterrichtung: Mono-Jetronic, 1. Ausgabe 6/91, Seite 24), bei der Zwischen Brennstoffzuführungskanal und Brennstoffabführungskanal außerhalb des Brennstoffeinspritzventiles wenigstens eine Strömungsöffnung ausgebildet ist, durch die Brennstoff strömt und durch die beispielsweise eine Entgasung des zugeführten Brennstoffs vor Eintritt in das Brennstoffeinspritzventil erfolgt, wobei jedoch nicht verhindert werden kann, daß im Brennstoff mitgespülte Fremdkörper, die beispielsweise bei der Montage der Brennstoffleitungen entstehen, durch die Strömungsöffnung in den Brennstoffabführungskanal und von dort weiter in den Druckregler gelangen, wo sie Störungen in der Druckregelung verursachen.The invention relates to a fuel injection device according to the preamble of the main claim. A fuel injection device is already known (Bosch, technical information: Mono-Jetronic, 1st edition 6/91, page 24), in which at least one flow opening is formed between the fuel supply duct and the fuel discharge duct outside the fuel injection valve, through which fuel flows and through which, for example degassing of the supplied fuel takes place before entry into the fuel injection valve, but it cannot be prevented that foreign bodies which are also flushed in the fuel and which arise, for example, during assembly of the fuel lines, pass through the flow opening into the fuel discharge duct and from there into the pressure regulator, where they cause disturbances in the pressure control.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Brennstoffeinspritzvorrichtung mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß trotz Umspülung des Brennstoffeinspritzventiles und der dadurch ermöglichten Entgasung des Brennstoffs vermieden wird, daß im Brennstoff mitgeführte Fremdkörper Störungen in der Druckregelung verursachen. Dies wird dadurch erreicht, daß ab einer von der Ausführung der Strömungsöffnungen abhängigen Größe Fremdkörper diese nicht passieren können.The fuel injector according to the invention with the characterizing features of the main claim has the advantage that, despite the fuel injector and the This enables degassing of the fuel to be avoided, so that foreign bodies carried in the fuel cause disturbances in the pressure control. This is achieved in that from a size dependent on the design of the flow openings, foreign bodies cannot pass through them.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen der im Hauptanspruch angegebenen Brennstoffeinspritzvorrichtung möglich. Besonders vorteilhaft ist die Ausbildung der Strömungsöffnungen im Rand eines eine Brennstofföffnung des Brennstoffeinspritzventiles umschließenden Siebkörpers.Advantageous further developments and improvements of the fuel injection device specified in the main claim are possible through the measures listed in the subclaims. The formation of the flow openings in the edge of a sieve body enclosing a fuel opening of the fuel injection valve is particularly advantageous.

Zeichnungdrawing

Ausführungsbeispiele der Erfindung sind in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 einen Längsschnitt einer Brennstoffeinspritzvorrichtung, Figur 2 und 3 jeweils weitere Ausführungsbeispiele der Erfindung.Embodiments of the invention are shown in simplified form in the drawing and explained in more detail in the following description. FIG. 1 shows a longitudinal section of a fuel injection device, FIGS. 2 and 3 each show further exemplary embodiments of the invention.

Beschreibung der AusführungsbeispieleDescription of the embodiments

In Figur 1 ist mit 1 eine Brennstoffeinspritzvorrichtung bezeichnet, die auf einem mit 2 bezeichneten Drosselklappenstutzen eines Luftansaugrohres einer gemischverdichtenden, fremdgezündeten Brennkraftmaschine aufgesetzt ist. Der Querschnitt des Drosselklappenstutzens 2 ist durch eine in Figur 1 nicht dargestellte, in bekannter Weise betätigbare Drosselklappe steuerbar, so daß über den Drosselklappenstutzen 2 in Richtung der Pfeile 3 mehr oder weniger Luft zur Brennkraftmaschine strömen kann. Die Brennstoffeinspritzvorrichtung 1 weist einen Trägerkörper 4 auf, der stromaufwärts der Drosselklappe auf dem Drosselklappenstutzen 2 aufgesetzt ist und mindestens ein Stegteil 5 hat, das in einen Strömungsquerschnitt 8 des Drosselklappenstutzens 2 ragt. Das Stegteil 5 weist an seinem in den Strömungsquerschnitt 8 ragenden Ende eine gestufte Aufnahmebohrung 9 auf, in die konzentrisch zum Strömungsquerschnitt 8 des Drosselklappenstutzens 2 ein Brennstoffeinspritzventil 10 eingesetzt ist, über dessen Mundstück 11 Brennstoff in Richtung der Pfeile 3 abspritzbar ist. Dem Mundstück 11 abgewandt ist die Aufnahmebohrung 9 im Trägerkörper 4 durch eine Verkleidung 12 abgedeckt, die mittels einer Schraube 13 am Stegteil 5 befestigt ist. In eine von Aufnahmebohrung 9 und Brennstoffeinspritzventil 10 gebildete Brennstoffkammer 16 münden je ein im Stegteil 5 verlaufender Brennstoffzuführungskanal 17 und ein Brennstoffabführungskanal 18. Der Brennstoffzuführungskanal 17 ist mit einem im Trägerkörper 4 ausgebildeten Zwischenraum 19 verbunden, in den ein Anschlußkanal 20 mündet, über den die Brennstoffversorgung der Brennstoffeinspritzvorrichtung 1 erfolgt. In der Zeichnung nicht näher dargestellte Brennstofföffnungen des Brennstoffeinspritzventiles 10, durch die Brennstoff aus der Brennstoffkammer 16 in das Innere des Brennstoffeinspritzventiles 10 einströmen, bzw. aus dem Inneren des Brennstoffeinspritzventiles 10 in die Brennstoffkammer 16 ausströmen kann, sind von Siebkörpern 23 und 24 umgeben, die das Eindringen von im Brennstoff mitgespülten Fremdkörpern in das Innere des Brennstoffeinspritzventiles 10 verhindern und von denen der Siebkörper 23 etwa im Bereich der Mündungen von Brennstoffzuführungskanal 17 und Brennstoffabführungskanal 18 und der Siebkörper 24 nahe zum Mundstück 11 liegt. In einer weiteren, in der Zeichnung nicht dargestellten Ausführung einer Brennstoffeinspritzvorrichtung 1 ist zwischen Brennstoffkammer 16 und Brennstoffeinspritzventil 10 ein einteiliger Siebkörper ausgebildet, der ebenfalls zugleich die Brennstofföffnungen für den einströmenden und ausströmenden Brennstoff abdeckt und das Eindringen von Fremdkörpern in das Innere des Brennstoffeinspritzventiles 10 verhindert.In FIG. 1, 1 denotes a fuel injection device which is placed on a throttle valve connector, designated 2, of an air intake pipe of a mixture-compressing, spark-ignited internal combustion engine. The cross section of the throttle valve body 2 can be controlled by a throttle valve which is not shown in FIG. 1 and can be actuated in a known manner, so that more or less air can flow to the internal combustion engine via the throttle valve body 2 in the direction of the arrows 3. The fuel injection device 1 has a carrier body 4, which is placed upstream of the throttle valve on the throttle valve connector 2 and at least one Has web part 5, which projects into a flow cross section 8 of the throttle valve connector 2. The web part 5 has, at its end projecting into the flow cross section 8, a stepped receiving bore 9, into which a fuel injection valve 10 is inserted concentrically with the flow cross section 8 of the throttle valve connector 2 and via the mouthpiece 11 of which fuel can be sprayed off in the direction of the arrows 3. Averted from the mouthpiece 11, the receiving bore 9 in the carrier body 4 is covered by a covering 12 which is fastened to the web part 5 by means of a screw 13. A fuel supply duct 17 and a fuel discharge duct 18 running in the web part 5 each open into a fuel chamber 16 formed by the receiving bore 9 and the fuel injection valve 10. The fuel supply duct 17 is connected to an intermediate space 19 formed in the carrier body 4, into which a connecting duct 20 opens, via which the fuel supply the fuel injector 1. Fuel openings of the fuel injector 10, not shown in the drawing, through which fuel can flow from the fuel chamber 16 into the interior of the fuel injector 10, or can flow out of the interior of the fuel injector 10 into the fuel chamber 16, are surrounded by sieve bodies 23 and 24, which Prevent the penetration of foreign bodies flushed in the fuel into the interior of the fuel injection valve 10 and of which the screen body 23 lies approximately in the area of the mouths of the fuel supply channel 17 and fuel discharge channel 18 and the screen body 24 close to the mouthpiece 11. In a further embodiment, not shown in the drawing, of a fuel injection device 1, a one-piece screen body is formed between the fuel chamber 16 and the fuel injection valve 10, which also covers the fuel openings for the inflowing and outflowing fuel and prevents the ingress of foreign bodies into the interior of the fuel injection valve 10.

Innerhalb der Brennstoffkammer 16 ist zwischen Brennstoffzuführungskanal 17 und Brennstoffabführungskanal 18 wenigstens eine Strömungsöffnung 25 ausgebildet, über die Brennstoff von stromaufwärts der wenigstens einen Strömungsöffnung 25 außerhalb des Brennstoffeinspritzventiles 10 nach stromabwärts in den oberen Teil 21 der Brennstoffkammer 16 strömen kann und durch die beispielsweise eine Entgasung des Brennstoffs erfolgt. Vom oberen Teil 21 der Brennstoffkammer 16 strömt Brennstoff durch den im Stegteil 5 verlaufenden Brennstoffabführungskanal 18 in eine Ausgleichskammer 27 eines Druckreglers 26, die durch eine Membran 28 begrenzt wird, die mit ihrem Umfang auf einem Absatz 29 aufliegt, gegen den sie von einem Ringflansch 30 eines Deckels 33 gepreßt wird, an dem ein Spannring 34 angreift, der mit Hilfe von in der Zeichnung nicht dargestellter Schrauben am Trägerkörper 4 befestigt ist. Der Deckel 33 umschließt eine Luftkammer 35, die durch die Membran 28 von der Ausgleichskammer 27 getrennt ist.At least one flow opening 25 is formed within the fuel chamber 16 between the fuel supply duct 17 and the fuel discharge duct 18, via which fuel can flow from upstream of the at least one flow opening 25 outside the fuel injection valve 10 downstream into the upper part 21 of the fuel chamber 16 and through which, for example, a degassing of the Fuel. From the upper part 21 of the fuel chamber 16, fuel flows through the fuel discharge channel 18 running in the web part 5 into an equalizing chamber 27 of a pressure regulator 26, which is delimited by a membrane 28, the periphery of which rests on a shoulder 29, against which it is supported by an annular flange 30 a cover 33 is pressed on which a clamping ring 34 engages, which is fastened to the carrier body 4 with the aid of screws (not shown in the drawing). The cover 33 encloses an air chamber 35 which is separated from the compensation chamber 27 by the membrane 28.

Ein Einsatzkörper 36 durchdringt die Membran 28 und ist mit einem Federteller 37 formschlüssig verbunden, an dem sich eine Feder 38 abstützt, die andererseits am Deckel 33 angreift. In einem Konus 39 des Einsatzkörpers 36 ist eine Kugel 40 drehbar gelagert, die durch eine Haltescheibe 42 in dem Konus 39 gehalten wird und mit einem Ventilteller 43 stoffschlüssig verbunden ist, der mit der Membran 28 und den Teilen 36, 37, 38, 40 und 42 das bewegliche Ventilteil des Druckreglers 26 bildet.An insert body 36 penetrates the membrane 28 and is positively connected to a spring plate 37, on which a spring 38 is supported, which on the other hand engages the cover 33. In a cone 39 of the insert body 36, a ball 40 is rotatably supported, which is held in the cone 39 by a retaining washer 42 and is integrally connected to a valve disk 43 which is connected to the membrane 28 and the parts 36, 37, 38, 40 and 42 forms the movable valve part of the pressure regulator 26.

Auf den Ventilteller 43 hin ausgerichtet ist ein Ventilsitz 45 an einem Ventilsitzkörper 46 ausgebildet, der teilweise in die Ausgleichskammer 27 ragend in eine Befestigungsbohrung 47 im Trägerkörper 4 eingesetzt ist, beispielsweise eingeschraubt oder eingepreßt ist. Eine in Längsrichtung des Ventilsitzkörpers 46 verlaufende Rücklaufbohrung 48, die einen bestimmten Öffnungsdurchmesser 49 in der Nähe eines Ventilsitzes 45 aufweist, ermöglicht bei vom Ventilsitz 45 abgehobenem Ventilteller 43 das Abströmen von Brennstoff aus der Ausgleichskammer 27.Aligned towards the valve plate 43, a valve seat 45 is formed on a valve seat body 46, which is partially inserted into the compensation chamber 27 and protrudes into a fastening bore 47 in the support body 4, for example, is screwed or pressed in. A return bore 48 running in the longitudinal direction of the valve seat body 46, which has a specific opening diameter 49 in the vicinity of a valve seat 45, enables the valve seat 45 lifted valve plate 43 the outflow of fuel from the equalization chamber 27.

Es hat sich gezeigt, daß im Brennstoff mitgespülte Fremdkörper, die beispielsweise bei der Montage der Brennstoffanschlüsse aus den Wandungen der Brennstoffleitungen herausgelöst werden, über den Brennstoffzuführungskanal 17, die Strömungsöffnung 25 und den Brennstoffabführungskanal 18 in die Ausgleichskammer 27 gelangen und sich dort aufgrund ihrer äußeren Gestalt bei abgehobenem Ventilteller 43 in dem Öffnungsdurchmesser 49 bzw. der Rücklaufbohrung 48 festsetzen, was Störungen in der Druckregelung verursacht.It has been shown that foreign bodies which are flushed in the fuel and which are detached from the walls of the fuel lines, for example during the assembly of the fuel connections, pass through the fuel supply duct 17, the flow opening 25 and the fuel discharge duct 18 into the compensation chamber 27, and there due to their external shape with the valve disc 43 lifted, fix it in the opening diameter 49 or the return bore 48, which causes malfunctions in the pressure control.

Erfindungsgemäß ist deshalb vorgesehen, die Strömungsöffnung 25 derart auszubilden, daß im Brennstoff mitgespülte Fremdkörper ab einer von der Ausführung der Strömungsöffnung 25 abhängigen Größe an dieser zurückgehalten werden. Die Strömungsöffnung 25 wird beim vorliegenden Ausführungsbeispiel durch den radialen Abstand zwischen einem unteren Rand 51 des Siebkörpers 23 und der Wandung der Aufnahmebohrung 9 in Form eines Ringspaltes 31 gebildet.According to the invention, it is therefore provided that the flow opening 25 is designed in such a way that foreign bodies which are also flushed in the fuel are retained on the flow opening 25 from a size dependent on the design thereof. In the present exemplary embodiment, the flow opening 25 is formed in the form of an annular gap 31 by the radial distance between a lower edge 51 of the sieve body 23 and the wall of the receiving bore 9.

In Figur 2 ist ein weiteres Ausführungsbeispiel der Erfindung gezeigt. Die gegenüber dem Ausführungsbeispiel nach Figur 1 gleichbleibenden und gleichnamigen Teile sind durch die gleichen Bezugszeichen gekennzeichnet. Die Strömungsöffnung 25 kann nicht nur durch den in Figur 2 gestrichelt dargestellten Ringspalt 31, sondern auch durch einzelne Aussparungen 32 gebildet werden, die beispielsweise in einem Rand 51 des um das Einspritzventil 10 angeordneten Siebkörpers 23 ausgebildet sind. Außerdem kann die Strömungsöffnung 25 auch durch eine Kombination aus Ringspalt 31 und Aussparungen 32 gebildet werden. Die Aussparungen 32 können dabei durch Löcher im Rand 51 des Siebkörpers 23 gebildet sein, die zum Umfang des Randes 51 hin geöffnet oder geschlossen sind. Der Rand 51 kann auch eine zahnradförmige Ausbildung annehmen. In entsprechender Weise können die Aussparungen 32 in der Wandung der Aufnahmebohrung 9 ausgebildet sein, wie in Figur 2 gepunktet dargestellt ist. Der freie Querschnitt jeder Aussparung 32 kann eine beliebige Form haben, wie kreisförmig, oval, rechteckig, trapezförmig u.a.. Die Anzahl der ausgebildeten Aussparungen 32 wird von der Brennstoffmenge bestimmt, die wunschgemäß das Brennstoffeinspritzventil 10 umströmen soll.A further exemplary embodiment of the invention is shown in FIG. The parts that are the same and have the same name as in the exemplary embodiment according to FIG. 1 are identified by the same reference numerals. The flow opening 25 can be formed not only by the annular gap 31 shown in dashed lines in FIG. 2, but also by individual cutouts 32 which are formed, for example, in an edge 51 of the screen body 23 arranged around the injection valve 10. In addition, the flow opening 25 can also be formed by a combination of the annular gap 31 and cutouts 32. The recesses 32 can be formed by holes in the edge 51 of the screen body 23 which are opened or closed towards the periphery of the edge 51. The edge 51 can also assume a gear-shaped configuration. In a corresponding way, the recesses 32 be formed in the wall of the receiving bore 9, as shown in dotted lines in Figure 2. The free cross section of each recess 32 can have any shape, such as circular, oval, rectangular, trapezoidal and others. The number of recesses 32 formed is determined by the amount of fuel that the fuel injector 10 is to flow around as desired.

Damit verhindert wird, daß im Brennstoff mitgespülte Fremdkörper vom Brennstoffzuführungskanal 17 über die Strömungsöffnung 25 und den Brennstoffabführungskanal 18 in den Druckregler 26 gelangen und dort Störungen in der Druckregelung verursachen, hat der die Strömungsöffnung 25 bildende Ringspalt 31 eine radiale Breite 44, die höchstens gleich groß wie der Öffnungsdurchmesser 49 der Rücklaufbohrung 48 des Druckreglers 26 ist, und die durch Aussparungen 32, eventuell einschließlich eines Ringspaltes 31, gebildeten Strömungsöffnungen 25 haben Abmessungen, wie in radialer Richtung ausgehend von der Wandung der Aufnahmebohrung 9 eine größte Tiefe 52 und in Umfangsrichtung eine größte Breite 53, die jeweils höchstens gleich groß wie der Öffnungsdurchmeser 49 der Rücklaufbohrung 48 des Druckreglers 26 sind.To prevent foreign bodies that are flushed in the fuel from entering the pressure regulator 26 via the flow opening 25 and the fuel discharge duct 18 and causing disturbances in the pressure control there, the annular gap 31 forming the flow opening 25 has a radial width 44 which is at most the same size how the opening diameter 49 of the return bore 48 of the pressure regulator 26 is, and the flow openings 25 formed by recesses 32, possibly including an annular gap 31, have dimensions such as a greatest depth 52 in the radial direction starting from the wall of the receiving bore 9 and a greatest circumferential direction Width 53, which are at most the same size as the opening diameter 49 of the return bore 48 of the pressure regulator 26.

In Figur 3 ist ein weiteres Ausführungsbeispiel gezeigt. Die gegenüber dem Ausführungsbeispiel nach Figur 1 und 2 gleichbleibenden und gleichwirkenden Teile sind durch die gleichen Bezugszeichen gekennzeichnet. Die Strömungsöffnungen 25 sind dabei als Aussparungen 32 in einem zwischen der Wandung der Aufnahmebohrung 9 und dem Siebkörper 23 oder direkt am Umfang des Brennstoffeinspritzventiles 10 angeordneten separaten Ringkörper 54 ausgebildet, mit Abmessungen, die höchstens gleich groß wie der Öffnungsdurchmesser 49 der Rücklaufbohrung 48 des Druckreglers 26 sind. Die Form der Aussparungen 32 entspricht den in Figur 2 beschriebenen Formen. In Figur 3 sind ringförmige Aussparungen dargestellt. In einer weiteren Ausführung ist der Ringkörper 54 mit einem radial sich erstreckenden Filtermaterial 55 versehen, das wenigstens alle Fremdkörper zurückhält, die größer als der Öffnungsdurchmesser 49 der Rücklaufbohrung 48 des Druckreglers 26 sind. Wie bereits zur Figur 2 beschrieben wurde, kann auch bei den Ausführungsbeispielen nach Figur 3 zwischen dem Umfang des Ringkörpers 54 und der Wandung der Aufnahmebohrung 9 ein zusätzlicher Ringspalt 31 vorgesehen sein, dessen radiale Breite 44 höchstens gleich groß wie der Öffnungsdurchmesser 49 der Rücklaufbohrung 48 des Druckreglers 26 ist.Another exemplary embodiment is shown in FIG. The parts which remain the same and have the same effect as in the exemplary embodiment according to FIGS. 1 and 2 are identified by the same reference numerals. The flow openings 25 are formed as recesses 32 in a separate annular body 54 arranged between the wall of the receiving bore 9 and the strainer body 23 or directly on the circumference of the fuel injection valve 10, with dimensions that are at most the same size as the opening diameter 49 of the return bore 48 of the pressure regulator 26 are. The shape of the cutouts 32 corresponds to the shapes described in FIG. 2. In Figure 3 annular recesses are shown. In a further embodiment, the ring body 54 is made with a radially extending filter material 55 provided, which at least retains all foreign bodies that are larger than the opening diameter 49 of the return bore 48 of the pressure regulator 26. As already described for FIG. 2, an additional annular gap 31 can also be provided between the circumference of the ring body 54 and the wall of the receiving bore 9 in the exemplary embodiments according to FIG Pressure regulator 26 is.

Claims (15)

Brennstoffeinspritzvorrichtung für eine gemischverdichtende, fremdgezündete Brennkraftmaschine mit einem Trägerkörper, in dem wenigstens eine Aufnahmebohrung ausgebildet ist, die mit wenigstens einem Brennstoffzuführungskanal und wenigstens einem Brennstoffabführungskanal verbunden und in die jeweils ein Brennstoffeinspritzventil eingesetzt ist, wobei auf dem Brennstoffeinspritzventil ein Siebkörper angeordnet ist, der einen Rand hat, der sich in Richtung einer Wandung der Aufnahmebohrung erstreckt und einen mit dem Brennstoffzuführungskanal verbundenen Bereich begrenzt, wobei am Rand des Siebkörpers wenigstens eine Strömungsöffnung vorgesehen ist, über die Brennstoff vom Brennstoffzuführungskanal zum Brennstoffabführungskanal strömen kann und von dort zu einer einen bestimmten Öffnungsdurchmesser aufweisenden Rücklaufbohrung eines Druckreglers, dadurch gekennzeichnet, daß die wenigstens eine Strömungsöffnung (25, 31, 32) Abmessungen hat, die höchstens gleich groß wie der Öffnungsdurchmesser (49) der Rücklaufbohrung (48) des Druckreglers (26) ist.Fuel injection device for a mixture-compressing, spark-ignited internal combustion engine with a carrier body, in which at least one receiving bore is formed, which is connected to at least one fuel supply duct and at least one fuel discharge duct and in each of which a fuel injector is inserted, a sieve body having an edge being arranged on the fuel injector has, which extends in the direction of a wall of the receiving bore and delimits an area connected to the fuel supply duct, at least one flow opening being provided at the edge of the screen body, through which fuel can flow from the fuel supply duct to the fuel discharge duct and from there to a return bore having a specific opening diameter of a pressure regulator, characterized in that the at least one flow opening (25, 31, 32) has dimensions which are at most the same size as the opening diameter (49) of the return bore (48) of the pressure regulator (26). Brennstoffeinspritzvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die wenigstens eine Strömungsöffnung (25, 31, 32) in radialer Richtung ausgehend von der Wandung der Aufnahmebohrung (9) eine größte Tiefe (52) hat, die höchstens gleich groß wie der Öffnungsdurchmesser (49) der Rücklaufbohrung (48) des Druckreglers (26) ist.Fuel injection device according to Claim 1, characterized in that the at least one flow opening (25, 31, 32) in the radial direction, starting from the wall of the receiving bore (9), has a greatest depth (52) which is at most the same size as the opening diameter (49) the return bore (48) of the pressure regulator (26). Brennstoffeinspritzvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Strömungsöffnung (25, 31, 32) im Rand (51) des Siebkörpers (23) ausgebildet ist.Fuel injection device according to Claim 1, characterized in that the flow opening (25, 31, 32) is formed in the edge (51) of the screen body (23). Brennstoffeinspritzvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Strömungsöffnungen (25) als zum Umfang des Randes (51) hin offene Aussparungen (32) ausgebildet sind.Fuel injection device according to Claim 1, characterized in that the flow openings (25) are designed as cutouts (32) which are open towards the periphery of the edge (51). Brennstoffeinspritzvorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß der Rand (51) zahnradförmig ausgebildet ist.Fuel injection device according to claim 4, characterized in that the edge (51) is gear-shaped. Brennstoffeinspritzvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Strömungsöffnungen (25) in der Wandung der Aufnahmebohrung (9) ausgebildet sind.Fuel injection device according to Claim 1, characterized in that the flow openings (25) are formed in the wall of the receiving bore (9). Brennstoffeinspritzvorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß jede Strömungsöffnung (25, 32) eine größte Breite (53) hat, die höchstens gleich groß wie der Öffnungsdurchmesser (49) der Rücklaufbohrung (48) des Druckreglers (26) ist.Fuel injection device according to one of the preceding claims, characterized in that each flow opening (25, 32) has a greatest width (53) which is at most the same size as the opening diameter (49) of the return bore (48) of the pressure regulator (26). Brennstoffeinspritzvorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß zwischen dem Rand (51) des Siebkörpers (23) und der Wandung der Aufnahembohrung (9) ein Ringspalt (31) gebildet ist.Fuel injection device according to one of the preceding claims, characterized in that an annular gap (31) is formed between the edge (51) of the screen body (23) and the wall of the receiving bore (9). Brennstoffeinspritzvorrichtung für eine gemischverdichtende, fremdgezündete Brennkraftmaschine mit einem Trägerkörper, in dem wenigstens eine Aufnahmebohrung ausgebildet ist, die mit wenigstens einem Brennstoffzuführungskanal und wenigstens einem Brennstoffabführungskanal verbunden und in die jeweils ein wenigstens einen Siebkörper aufweisendes Brennstoffeinspritzventil eingesetzt ist und ein mit dem Brennstoffzuführungskanal verbundener Bereich der Aufnahmebohrung gegenüber einem mit dem Brennstoffabführungskanal verbundenen Bereich abgegrenzt ist und die Bereiche über wenigstens eine Strömungsöffnung miteinander verbunden sind, über die Brennstoff vom Brennstoffzuführungskanal am Brennstoffeinspritzventil vorbei strömen kann, und von dort zu einer einen bestimmten Öffnungsdurchmesser aufweisenden Rücklaufbohrung (48) eines Druckreglers, dadurch gekennzeichnet, daß der mit dem Brennstoffzuführkanal (17) verbundene Bereich der Aufnahmebohrung (9) von dem mit dem Brennstoffabführungskanal (18) verbundenen Bereich durch einen separaten Ringkörper (54) abgegrenzt ist, der zwischen der Wandung der Aufnahmebohrung (9) und dem Brennstoffeinspritzventil (10) angeordnet ist und an dem die Strömungsöffnungen (25) ausgebildet sind, die Abmessungen haben, die höchstens gleich groß wie der Öffnungsdurchmesser (49) der Rücklaufbohrung (48) des Druckreglers (26) sind.Fuel injection device for a mixture-compressing, spark-ignited internal combustion engine with a carrier body in which at least one receiving bore is formed, which is connected to at least one fuel supply channel and at least one fuel discharge channel and into which a fuel injection valve each having at least one screen body is inserted and an area of the receiving bore connected to the fuel supply channel is delimited from an area connected to the fuel discharge channel and the areas are connected to one another via at least one flow opening, through which fuel can flow from the fuel supply channel past the fuel injection valve, and from there to a return bore (48) of a pressure regulator having a specific opening diameter, characterized in that that the area of the receiving bore (9) connected to the fuel supply channel (17) is delimited from the area connected to the fuel discharge channel (18) by a separate ring body (54) which is located between the wall of the receiving bore (9) and the fuel injection valve (10) is arranged and on which the flow openings (25) are formed, which have dimensions that are at most the same size as the opening diameter (49) of the return bore (48) of the pressure regulator (26). Brennstoffeinspritzvorrichtung nach Anspruch 9, dadurch gekennzeichnet, daß die Strömungsöffnungen (25) in radialer Richtung, ausgehend von der Wandung der Aufnahmebohrung (9), eine größte Tiefe (52) haben, die höchstens gleich groß wie der Öffnungsdurchmesser (49) der Rücklaufbohrung (48) des Druckreglers (26) ist.Fuel injection device according to Claim 9, characterized in that the flow openings (25) in the radial direction, starting from the wall of the receiving bore (9), have a greatest depth (52) which is at most the same size as the opening diameter (49) of the return bore (48 ) of the pressure regulator (26). Brennstoffeinspritzvorrichtung nach Anspruch 10, dadurch gekennzeichnet, daß die Strömungsöffnungen (25) als zum Umfang des unteren Randes (51) hin offene Aussparungen (32) ausgebildet sind.Fuel injection device according to Claim 10, characterized in that the flow openings (25) are designed as recesses (32) which are open towards the periphery of the lower edge (51). Brennstoffeinspritzvorrichtung nach Anspruch 11, dadurch gekennzeichnet, daß der Rand des Ringkörpers (54) zahnradförmig ausgebildet ist.Fuel injection device according to Claim 11, characterized in that the edge of the ring body (54) is gear-shaped. Brennstoffeinspritzvorrichtung nach Anspruch 11 oder 12, dadurch gekennzeichnet, daß die Strömungsöffnungen (25) in radialer Richtung ausgehend von der Wandung der Aufnahmebohrung (9) eine größte Tiefe (52) haben, die höchstens gleich groß wie der Öffnungsdurchmesser (49) der Rücklaufbohrung (48) des Druckreglers (26) ist.Fuel injection device according to claim 11 or 12, characterized in that the flow openings (25) in the radial direction, starting from the wall of the receiving bore (9), have a greatest depth (52) which is at most the same size as the opening diameter (49) of the return bore (48 ) of the pressure regulator (26). Brennstoffeinspritzvorrichtung nach Anspruch 9, dadurch gekennzeichnet, daß der Ringkörper (54) mit einem Filtermaterial (55) versehen ist.Fuel injection device according to Claim 9, characterized in that the annular body (54) is provided with a filter material (55). Brennstoffeinspritzvorrichtung nach einem der Ansprüche 9 bis 14, dadurch gekennzeichnet, daß zwischen dem Rand des Ringkörpers (54) und der Wandung der Aufnahmebohrung (9) ein Ringspalt (31) gebildet ist.Fuel injection device according to one of Claims 9 to 14, characterized in that an annular gap (31) is formed between the edge of the annular body (54) and the wall of the receiving bore (9).
EP93108991A 1992-07-10 1993-06-04 Fuel injection system Withdrawn EP0578963A1 (en)

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DE4222628A DE4222628A1 (en) 1992-07-10 1992-07-10 Fuel injector
DE4222628 1992-07-10

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US5280774A (en) 1994-01-25
JPH06185437A (en) 1994-07-05

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