EP0471676B1 - Fuel distributor for fuel injection installations in internal combustion engines - Google Patents

Fuel distributor for fuel injection installations in internal combustion engines Download PDF

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Publication number
EP0471676B1
EP0471676B1 EP90905184A EP90905184A EP0471676B1 EP 0471676 B1 EP0471676 B1 EP 0471676B1 EP 90905184 A EP90905184 A EP 90905184A EP 90905184 A EP90905184 A EP 90905184A EP 0471676 B1 EP0471676 B1 EP 0471676B1
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EP
European Patent Office
Prior art keywords
distributor
sleeve
fuel
clamping
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
Application number
EP90905184A
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German (de)
French (fr)
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EP0471676A1 (en
Inventor
Klaus-Jürgen PETERS
Heinz Ehrentraut
Helmut Bassler
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP0471676A1 publication Critical patent/EP0471676A1/en
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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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • 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
    • F02M69/465—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down of fuel rails
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B77/00—Component parts, details or accessories, not otherwise provided for
    • F02B77/11—Thermal or acoustic insulation
    • F02B77/13—Acoustic insulation
    • 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/005—Arrangement of electrical wires and connections, e.g. wire harness, sockets, plugs; Arrangement of electronic control circuits in or on fuel injection apparatus
    • 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
    • F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors
    • F02M61/145—Arrangements of injectors with respect to engines; Mounting of injectors the injection nozzle opening into the air intake conduit
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/85—Mounting of fuel injection apparatus
    • F02M2200/858—Mounting of fuel injection apparatus sealing arrangements between injector and engine

Definitions

  • the invention relates to a fuel distributor for fuel injection systems of internal combustion engines of the type defined in the preamble of claim 1.
  • Such a fuel rail is known from DE 37 30 571 A1 or from DE 32 28 508 A1.
  • the attachment to the internal combustion engine takes place via webs or flanges with through holes arranged on the distributor housing, through which a screw is passed and screwed on the internal combustion engine side.
  • the working noises of the fuel injection valves and the pressure pulsations which are caused by the timing of the fuel injection valves, are transmitted to the adjacent components, such as the intake manifold of the internal combustion engine, and lead to unpleasant noise in the engine compartment of the motor vehicle.
  • an elastic ring is provided in a known so-called top-feed fuel injection valve (DE 28 27 850 A1), which is inserted directly into a connecting piece on the intake manifold and is enclosed by a holder clamped on the intake manifold, which non-positively surrounds the fuel injection valve is placed and on which the holder engages.
  • the fuel distributor according to the invention with the characterizing features of claim 1 has the advantage that it is largely sound-decoupled from the adjacent components even in the design with a distributor housing which receives a number of fuel injection valves in fuel-flushed receiving bores corresponding to the number of cylinders of the internal combustion engine. As a result, extensive noise reduction in the engine compartment of the vehicle is achieved even when using a fuel distributor of the type described in the introduction.
  • each vibrating metal element is formed by an elastic sleeve, eg made of elastomer and a clamping element that can be anchored to the intake manifold.
  • the elastic sleeve is inserted in mutually aligned through bores in the distributor housing and hold-down device, and the clamping element penetrates the sleeve with radial pressure on the sleeve against the bore walls and overlaps the sleeve with a clamping shoulder, the diameter of which is not greater than the outside diameter of the sleeve.
  • the clamping element consists of a clamping screw and a metallic spacer sleeve surrounding the screw shaft.
  • the spacer sleeve abuts the screw head and the mounting flange of the intake manifold so that the fuel rail can be attached to the mounting flange of the intake manifold with a defined torque.
  • the diameter of the screw head is slightly smaller than the diameter of the elastic sleeve surrounding the spacer sleeve, so that the vibrating metal character is retained.
  • the holding-down device also forms the contact strip for the electrical contacting of the electromagnetically actuated fuel injection valves
  • the connecting cables leading to the plug contacts in the contact strip are fixed in the cable channels provided in the holding-down device, e.g. by mechanical fasteners or by pouring or foaming. This avoids free, oscillatory conductor cross-sections and also prevents noise.
  • the distributor housing and hold-down are suitably made of plastic, but can also be made of metal.
  • the drawing shows a section of a cross section of a fuel distributor for a fuel injection system of an internal combustion engine.
  • the fuel distributor shown in cross section in the drawing has a plastic distributor housing 10, in which a plurality of receiving bores 11 are contained.
  • the number of receiving bores 11 corresponds to the number of cylinders of the internal combustion engine, so that four receiving bores 11 are provided in the distributor housing 10 for a fuel distributor for a four-cylinder internal combustion engine.
  • Each longitudinally continuous and stepped receiving bore 11 has a longer bore section 111 and a bore section 112 and 113 upstream and downstream of the bore section 111, the bore section 112 having a larger bore diameter and the bore section 113 having a smaller bore diameter than the central bore section 111.
  • the bore section 113 ends with an orifice opening 12 and protrudes after assembly into an injection opening 14 formed in an intake manifold 13 of an internal combustion engine.
  • a mounting flange 49 is provided on the intake pipe 13, on which a support surface is placed with the interposition of an elastic sealing ring 15 made of elastomer 16 rests, which is arranged on the distributor housing 10 coaxially to the receiving bore 11 and set back from the opening 12 of the receiving bore 11.
  • an electromagnetically actuated fuel injection valve 17 of a known type is used in each receiving bore 11, an electromagnetically actuated fuel injection valve 17 of a known type is used.
  • a fuel injection valve is shown in detail, for example, in DE 37 05 848 A1.
  • the fuel injection valve 17 lies in the bore section 112 with a housing flange 18 and in the bore section 113 with an orifice connection 19.
  • the bore section 111 which is connected to a fuel supply line that cannot be seen here, is liquid-tightly closed by two O-rings 20, 21, which are supported radially on the one hand on the fuel injection valve 17 and on the other hand on the bore wall in the bore section 111 or 113.
  • a complete distributor housing 10 with inserted fuel injection valves 17, in which the course of the fuel supply line can also be seen, is shown in DE 37 30 571 A1.
  • a holding-down device 22 made of plastic which rests with a clamping flange 23 on a support flange 24 on the distributor housing 10 and overlaps the housing flange 18 of the fuel injection valve 17. With this overlap area of the clamping flange 23, the hold-down device 22 holds the fuel injection valves 17 in the distributor housing 10.
  • a continuous flat gasket 25 made of elastomer is inserted between the clamping flange 23 of the hold-down device 22 and the carrier flange 24 of the distributor housing 10.
  • the hold-down device 22 is also designed as a so-called contact strip, which contains sockets 26 and connecting cables 27 leading to the sockets.
  • the sockets 26 are arranged so that they are when the Push the hold-down device 22 onto the distributor housing 10 via pins 28 on the fuel injection valves 17.
  • the power supply to the electromagnets of the fuel injection valves 17 is established via the connecting cables 27, sockets 26 and pins 28.
  • the connecting cables 27 are laid within the hold-down device 22 in cable channels 29. To avoid the development of noise, the connecting cables 27 are fixed in the cable channels 29, in the exemplary embodiment by a mechanical cable holder 30. To fix the connecting cables 27, the cable channels 29 can also be poured out or foamed.
  • Both the connection between the hold-down device 22 and the distributor housing 10 and also the fastening of the complete fuel distributor to the fastening flange 49 of the intake pipe 13 takes place by means of so-called vibrating metal elements 31 and 32.
  • Each vibrating metal element 31 or 32 is composed of a clamping element 33 or 34 and one this enclosing elastic sleeve 35 and 36 made of elastomer.
  • the elastic sleeve 35 is inserted into a through hole 37 in the distributor housing 10, while the elastic sleeve 36 is inserted into two mutually aligned through holes 38 and 39 in the distributor housing 10 and in the hold-down device 22.
  • the clamping element 31 penetrates the elastic sleeve 35 under radial pressure against the bore wall of the through bore 37 and is anchored in the hold-down device 22.
  • the clamping element 34 penetrates the elastic sleeve 36 in the same way with radial pressure on the bore walls of the through bores 38 and 39 and is anchored in the mounting flange 49 on the intake pipe 13.
  • the clamping element 33 or 34 overlaps the associated elastic sleeve 35 or 36 on its end face facing away from the anchoring with a Clamping shoulder 40 or 41, which is not larger than the outer diameter of the elastic sleeve 35 or 36.
  • Each clamping element 33, 34 is formed by a clamping screw 42, 43 and a metallic spacer sleeve 44 or 45 surrounding the screw shaft.
  • the undersides of the screw heads each form the clamping shoulders 40 and 41.
  • Corresponding threaded bushes 46 are inserted into the hold-down device 22, in each of which one of the clamping screws 42 is screwed in with a defined tightening torque.
  • the spacer sleeve 45 protrudes slightly on the underside of the distributor housing 10 facing the mounting flange 49 of the intake pipe 13, so that a small gap 48 remains between the distributor housing 10 and the mounting flange 49 of the intake pipe 13 when the fuel distributor is braced on the intake pipe 13.
  • the elastic sleeve 36 can also protrude by the same amount over the distributor housing 10, but this is not mandatory.
  • the screw shaft of the clamping screw 43 is also screwed into a threaded bore 47 in the mounting flange 49 with a defined tightening torque.
  • the two spacer sleeves 44, 45 enable the application of a precisely defined tightening torque of the clamping screws 42, 43 to the plastic design of the distributor housing 10 and hold-down device 22.
  • the distributor housing 10 and hold-down device 22 can also be made of metal with the fuel distributor being otherwise of the same construction.

Abstract

A fuel distributor for fuel injection installations in internal combustion engines has a distributor casing (10) with a plurality of drillings (11) interconnected by a fuel supply pipe to take electromagnetically actuated fuel injection valves (17), a clamp (22) stretched on the distributor casing (10) to hold the fuel injection valves (17) in the drillings (11) and means of securing on the inlet pipe (13) of the engine. To prevent the transmission of noise between the fuel distributor and the neighbouring components, a flat sound-insulating seal (25) is inserted between the distributor casing (10) and the clamp (22) and the securing means are made of oscillating metal components (32). Where the fuel distributor is made of plastic, the oscillating metal components (32) preferably consist of a turnbuckle (43), a metal spacer (45) and an elastic sleeve (36) which are arranged coaxially in the above order and pass through drillings (38, 39) in the distributor casing (10) and the clamp (22).

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Kraftstoffverteiler für Kraftstoffeinspritzanlagen von Brennkraftmaschinen der im Oberbegriff des Anspruchs 1 definierten Gattung.The invention relates to a fuel distributor for fuel injection systems of internal combustion engines of the type defined in the preamble of claim 1.

Ein solcher Kraftstoffverteiler ist aus der DE 37 30 571 A1 oder aus der DE 32 28 508 A1 bekannt. Bei beiden Kraftstoffverteilern erfolgt die Befestigung an der Brennkraftmaschine über an dem Verteilergehäuse angeordnete Stege oder Flansche mit Durchgangslöchern, durch welche jeweils eine Schraube hindurchgeführt und brennkraftmaschinenseitig verschraubt wird.Such a fuel rail is known from DE 37 30 571 A1 or from DE 32 28 508 A1. In both fuel distributors, the attachment to the internal combustion engine takes place via webs or flanges with through holes arranged on the distributor housing, through which a screw is passed and screwed on the internal combustion engine side.

Bei solchen Kraftstoffverteilern werden die Arbeitsgeräusche der Kraftstoffeinspritzventile sowie die Druckpulsationen, die durch das Takten der Kraftstoffeinspritzventile verursacht werden, auf die angrenzenden Bauteile, wie Saugrohr der Brennkraftmaschine, übertragen und führen zu einer unangenehmen Geräuschentwicklung im Motorraum des Kraftfahrzeugs.In such fuel distributors, the working noises of the fuel injection valves and the pressure pulsations, which are caused by the timing of the fuel injection valves, are transmitted to the adjacent components, such as the intake manifold of the internal combustion engine, and lead to unpleasant noise in the engine compartment of the motor vehicle.

Zur Geräuschminderung ist bei einem bekannten sog. top-feed-Kraftstoffeinspritzventil (DE 28 27 850 A1), das unmittelbar in einen Anschlußstutzen am Saugrohr eingesetzt ist und von einem am Saugrohr festgespannten Halter umfaßt wird, ein elastischer Ring vorgesehen, der kraftschlüssig um das Kraftstoffeinspritzventil gelegt ist und an dem der Halter angreift.To reduce noise, an elastic ring is provided in a known so-called top-feed fuel injection valve (DE 28 27 850 A1), which is inserted directly into a connecting piece on the intake manifold and is enclosed by a holder clamped on the intake manifold, which non-positively surrounds the fuel injection valve is placed and on which the holder engages.

Vorteile der ErfindungAdvantages of the invention

Der erfindungsgemäße Kraftstoffverteiler mit den kennzeichnenden Merkmalen des Anspruchs 1 hat den Vorteil, daß er auch in der Bauart mit einem Verteilergehäuse, das eine der Anzahl der Zylinder der Brennkraftmaschine entsprechende Zahl von Kraftstoffeinspritzventilen in kraftstoffbespülten Aufnahmebohrungen aufnimmt, von den angrenzenden Bauteilen weitgehend schallentkoppelt ist. Dadurch wird auch bei Verwendung eines Kraftstoffverteilers der eingangs beschriebenen Art eine weitreichende Geräuschminderung im Motorraum des Fahrzeugs erreicht.The fuel distributor according to the invention with the characterizing features of claim 1 has the advantage that it is largely sound-decoupled from the adjacent components even in the design with a distributor housing which receives a number of fuel injection valves in fuel-flushed receiving bores corresponding to the number of cylinders of the internal combustion engine. As a result, extensive noise reduction in the engine compartment of the vehicle is achieved even when using a fuel distributor of the type described in the introduction.

Durch die in den weiteren Ansprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Anspruch 1 angegebenen Kraftstoffverteilers möglich.Advantageous further developments and improvements of the fuel distributor specified in claim 1 are possible through the measures listed in the further claims.

Bei einer vorteilhaften Ausführungsform der Erfindung ist jedes Schwingmetallelement durch eine elastische Hülse, z.B. aus Elastomer, und einem am Saugrohr verankerbaren Aufspannelement realisiert. Die elastische Hülse ist in miteinander fluchtenden Durchgangsbohrungen im Verteilergehäuse und Niederhalter eingesetzt, und das Aufspannelement durchdringt die Hülse unter radialer Anpressung der Hülse an die Bohrungswände und übergreift die Hülse mit einer Aufspannschulter, deren Durchmesser nicht größer ist als der Außendurchmesser der Hülse.In an advantageous embodiment of the invention, each vibrating metal element is formed by an elastic sleeve, eg made of elastomer and a clamping element that can be anchored to the intake manifold. The elastic sleeve is inserted in mutually aligned through bores in the distributor housing and hold-down device, and the clamping element penetrates the sleeve with radial pressure on the sleeve against the bore walls and overlaps the sleeve with a clamping shoulder, the diameter of which is not greater than the outside diameter of the sleeve.

Gemäß einer weiteren Ausführungsform der Erfindung besteht das Aufspannelement aus einer Spannschraube und einer den Schraubenschaft umschließenden metallischen Distanzhülse. Die Distanzhülse liegt stirnseitig am Schraubenkopf und am Befestigungsflansch des Saugrohrs an, so daß der Kraftstoffverteiler mit einem definierten Anzugsmoment am Befestigungsflansch des Saugrohrs befestigt werden kann. Der Durchmesser des Schraubenkopfes ist geringfügig kleiner als der Durchmesser der die Distanzhülse umschließenden elastischen Hülse, so daß der Schwingmetallcharakter erhalten bleibt.According to a further embodiment of the invention, the clamping element consists of a clamping screw and a metallic spacer sleeve surrounding the screw shaft. The spacer sleeve abuts the screw head and the mounting flange of the intake manifold so that the fuel rail can be attached to the mounting flange of the intake manifold with a defined torque. The diameter of the screw head is slightly smaller than the diameter of the elastic sleeve surrounding the spacer sleeve, so that the vibrating metal character is retained.

Bildet der Niederhalter zugleich die Kontaktleiste zur elektrischen Kontaktierung der elektromagnetisch betätigten Kraftstoffeinspritzventile, so sind gemäß einer weiteren Ausführungsform der Erfindung die zu den Steckkontakten in der Kontaktleiste führenden Verbindungskabel in den in dem Niederhalter vorgesehenen Kabelkanälen fixiert, z.B. durch mechanische Befestigungselemente oder durch Ausgießen oder Ausschäumen. Dadurch werden freie, schwingungsfähige Leiterquerschnitte vermieden und wird auch hier eine Geräuschentwicklung unterbunden.If the holding-down device also forms the contact strip for the electrical contacting of the electromagnetically actuated fuel injection valves, then according to a further embodiment of the invention the connecting cables leading to the plug contacts in the contact strip are fixed in the cable channels provided in the holding-down device, e.g. by mechanical fasteners or by pouring or foaming. This avoids free, oscillatory conductor cross-sections and also prevents noise.

Verteilergehäuse und Niederhalter bestehen zweckmäßigerweise aus Kunststoff, können aber auch aus Metall gefertigt werden.The distributor housing and hold-down are suitably made of plastic, but can also be made of metal.

Zeichnungdrawing

Die Erfindung ist anhand eines in der Zeichnung dargestellten Ausführungsbeispiels in der nachfolgenden Beschreibung näher erläutert. Dabei zeigt die Zeichnung ausschnittweise einen Querschnitt eines Kraftstoffverteilers für eine Kraftstoffeinspritzanlage einer Brennkraftmaschine.The invention is explained in more detail in the following description with reference to an embodiment shown in the drawing. The drawing shows a section of a cross section of a fuel distributor for a fuel injection system of an internal combustion engine.

Beschreibung des AusführungsbeispielsDescription of the embodiment

Der in der Zeichnung im Querschnitt dargestellte Kraftstoffverteiler weist ein Verteilergehäuse 10 aus Kunststoff auf, in welchem eine Mehrzahl von Aufnahmebohrungen 11 enthalten sind. Die Anzahl der Aufnahmebohrungen 11 entspricht der Anzahl der Zylinder der Brennkraftmaschine, so daß bei einem Kraftstoffverteiler für eine vierzylindrige Brennkraftmaschine im Verteilergehäuse 10 vier Aufnahmebohrungen 11 vorgesehen sind. Jede längsdurchgehende und abgestuft ausgebildete Aufnahmebohrung 11 hat einen längeren Bohrungsabschnitt 111 und einen jeweils dem Bohrungsabschnitt 111 vor- und nachgeordneten Bohrungsabschnitt 112 und 113, wobei der Bohrungsabschnitt 112 einen größeren Bohrungsdurchmesser und der Bohrungsabschnitt 113 einen kleineren Bohrungsdurchmesser als der mittlere Bohrungsabschnitt 111 aufweist. Der Bohrungsabschnitt 113 endet mit einer Mündungsöffnung 12 und ragt nach Montage in eine in einem Saugrohr 13 einer Brennkraftmaschine ausgebildete Einspritzöffnung 14. Im Bereich der Einspritzöffnung 14 ist am Ansaugrohr 13 ein Befestigungsflansch 49 vorgesehen, an dem unter Zwischenlage eines elastischen Dichtringes 15 aus Elastomer eine Auflagefläche 16 aufliegt, die am Verteilergehäuse 10 koaxial zur Aufnahmebohrung 11 und von der Mündungsöffnung 12 der Aufnahmebohrung 11 zurückversetzt angeordnet ist.The fuel distributor shown in cross section in the drawing has a plastic distributor housing 10, in which a plurality of receiving bores 11 are contained. The number of receiving bores 11 corresponds to the number of cylinders of the internal combustion engine, so that four receiving bores 11 are provided in the distributor housing 10 for a fuel distributor for a four-cylinder internal combustion engine. Each longitudinally continuous and stepped receiving bore 11 has a longer bore section 111 and a bore section 112 and 113 upstream and downstream of the bore section 111, the bore section 112 having a larger bore diameter and the bore section 113 having a smaller bore diameter than the central bore section 111. The bore section 113 ends with an orifice opening 12 and protrudes after assembly into an injection opening 14 formed in an intake manifold 13 of an internal combustion engine. In the area of the injection opening 14, a mounting flange 49 is provided on the intake pipe 13, on which a support surface is placed with the interposition of an elastic sealing ring 15 made of elastomer 16 rests, which is arranged on the distributor housing 10 coaxially to the receiving bore 11 and set back from the opening 12 of the receiving bore 11.

In jeder Aufnahmebohrung 11 ist ein elektomagnetisch betätigbares Kraftstoffeinspritzventil 17 bekannter Bauart eingesetzt. Ein solches Kraftstoffeinspritzventil ist beispielsweise in der DE 37 05 848 A1 im einzelnen dargestellt. Das Kraftstoffeinspritzventil 17 liegt mit einem Gehäuseflansch 18 im Bohrungsabschnitt 112 und mit einem Mündungsstutzen 19 im Bohrungsabschnitt 113 ein. Der Bohrungsabschnitt 111, der an einer hier nicht zu sehenden Kraftstoffversorgungsleitung angeschlossen ist, ist durch zwei O-Ringe 20,21, die sich einerseits am Kraftstoffeinspritzventil 17 und andererseits an der Bohrungswand im Bohrungsabschnitt 111 bzw. 113 radial abstützen, flüssigkeitsdicht abgeschlossen. Ein vollständiges Verteilergehäuse 10 mit eingesetzten Kraftstoffeinspritzventilen 17, in welchem auch der Verlauf der Kraftstoffversorgungsleitung zu sehen ist, ist in der DE 37 30 571 A1 dargestellt.In each receiving bore 11, an electromagnetically actuated fuel injection valve 17 of a known type is used. Such a fuel injection valve is shown in detail, for example, in DE 37 05 848 A1. The fuel injection valve 17 lies in the bore section 112 with a housing flange 18 and in the bore section 113 with an orifice connection 19. The bore section 111, which is connected to a fuel supply line that cannot be seen here, is liquid-tightly closed by two O-rings 20, 21, which are supported radially on the one hand on the fuel injection valve 17 and on the other hand on the bore wall in the bore section 111 or 113. A complete distributor housing 10 with inserted fuel injection valves 17, in which the course of the fuel supply line can also be seen, is shown in DE 37 30 571 A1.

Zur Arretierung der Kraftstoffeinspritzventile 17 in den Aufnahmebohrungen 11 des Verteilergehäuses 10 dient ein Niederhalter 22 aus Kunststoff, der mit einem Spannflansch 23 auf einem Trägerflansch 24 am Verteilergehäuse 10 aufliegt und den Gehäuseflansch 18 des Kraftstoffeinspritzventils 17 übergreift. Mit diesem Übergreifungsbereich des Spannflansches 23 hält der Niederhalter 22 die Kraftstoffeinspritzventile 17 im Verteilergehäuse 10 fest. Zur Vermeidung von Geräuschübertragungen ist zwischen dem Spannflansch 23 des Niederhalters 22 und dem Trägerflansch 24 des Verteilergehäuses 10 eine durchgehende Flachdichtung 25 aus Elastomer eingelegt.To hold the fuel injection valves 17 in the receiving bores 11 of the distributor housing 10, a holding-down device 22 made of plastic is used, which rests with a clamping flange 23 on a support flange 24 on the distributor housing 10 and overlaps the housing flange 18 of the fuel injection valve 17. With this overlap area of the clamping flange 23, the hold-down device 22 holds the fuel injection valves 17 in the distributor housing 10. To avoid noise transmission, a continuous flat gasket 25 made of elastomer is inserted between the clamping flange 23 of the hold-down device 22 and the carrier flange 24 of the distributor housing 10.

Der Niederhalter 22 ist gleichzeitig als sog. Kontaktleiste ausgebildet, die Steckbuchsen 26 und zu den Steckbuchsen führende Verbindungskabel 27 enthält. Die Steckbuchsen 26 sind so angeordnet, daß sie sich beim Aufsetzen des Niederhalters 22 auf das Verteilergehäuse 10 über Steckstifte 28 an den Kraftstoffeinspritzventilen 17 schieben. Über die Verbindungskabel 27, Steckbuchsen 26 und Steckstifte 28 wird die Stromversorgung der Elektromagnete der Kraftstoffeinspritzventile 17 hergestellt. Die Verbindungskabel 27 sind innerhalb des Niederhalters 22 in Kabelkanälen 29 verlegt. Zur Vermeidung von Geräuschentwicklungen sind die Verbindungskabel 27 in den Kabelkanälen 29 fixiert, im Ausführungsbeispiel durch einen mechanischen Kabelhalter 30. Zur Fixierung der Verbindungskabel 27 können aber auch die Kabelkanäle 29 ausgegossen oder ausgeschäumt werden.The hold-down device 22 is also designed as a so-called contact strip, which contains sockets 26 and connecting cables 27 leading to the sockets. The sockets 26 are arranged so that they are when the Push the hold-down device 22 onto the distributor housing 10 via pins 28 on the fuel injection valves 17. The power supply to the electromagnets of the fuel injection valves 17 is established via the connecting cables 27, sockets 26 and pins 28. The connecting cables 27 are laid within the hold-down device 22 in cable channels 29. To avoid the development of noise, the connecting cables 27 are fixed in the cable channels 29, in the exemplary embodiment by a mechanical cable holder 30. To fix the connecting cables 27, the cable channels 29 can also be poured out or foamed.

Sowohl die Verbindung zwischen Niederhalter 22 und Verteilergehäuse 10 als auch die Befestigung des kompletten Kraftstoffverteilers am Befestigungsflansch 49 des Ansaugrohrs 13 erfolgt mittels sog. Schwingmetallelemente 31 bzw. 32. Jedes Schwingmetallelement 31 bzw. 32 setzt sich zusammen aus einem Aufspannelement 33 bzw. 34 und einer dieses umschließenden elastischen Hülse 35 bzw. 36 aus Elastomer. Die elastische Hülse 35 ist in einer Durchgangsbohrung 37 im Verteilergehäuse 10 eingesetzt, während die elastische Hülse 36 in zwei miteinander fluchtende Durchgangsbohrungen 38 und 39 im Verteilergehäuse 10 und im Niederhalter 22 eingeführt ist. Das Aufspannelement 31 durchdringt die elastische Hülse 35 unter radialer Anpressung an die Bohrungswand der Durchgangsbohrung 37 und ist im Niederhalter 22 verankert. Das Aufspannelement 34 durchdringt in gleicher Weise unter radialer Anpressung an die Bohrungswände der Durchgangsbohrungen 38 und 39 die elastische Hülse 36 und ist im Befestigungsflansch 49 am Ansaugrohr 13 verankert. In beiden Fällen übergreift das Aufspannelement 33 bzw. 34 die zugeordnete elastische Hülse 35 bzw. 36 an deren der Verankerung abgekehrten Stirnseite mit einer Aufspannschulter 40 bzw. 41, die nicht größer ist als der Außendurchmesser der elastischen Hülse 35 bzw. 36.Both the connection between the hold-down device 22 and the distributor housing 10 and also the fastening of the complete fuel distributor to the fastening flange 49 of the intake pipe 13 takes place by means of so-called vibrating metal elements 31 and 32. Each vibrating metal element 31 or 32 is composed of a clamping element 33 or 34 and one this enclosing elastic sleeve 35 and 36 made of elastomer. The elastic sleeve 35 is inserted into a through hole 37 in the distributor housing 10, while the elastic sleeve 36 is inserted into two mutually aligned through holes 38 and 39 in the distributor housing 10 and in the hold-down device 22. The clamping element 31 penetrates the elastic sleeve 35 under radial pressure against the bore wall of the through bore 37 and is anchored in the hold-down device 22. The clamping element 34 penetrates the elastic sleeve 36 in the same way with radial pressure on the bore walls of the through bores 38 and 39 and is anchored in the mounting flange 49 on the intake pipe 13. In both cases, the clamping element 33 or 34 overlaps the associated elastic sleeve 35 or 36 on its end face facing away from the anchoring with a Clamping shoulder 40 or 41, which is not larger than the outer diameter of the elastic sleeve 35 or 36.

Jedes Aufspannelement 33,34 wird von einer Spannschraube 42,43 und einer den Schraubenschaft umschließenden metallischen Distanzhülse 44 bzw. 45 gebildet. Die Unterseiten der Schraubenköpfe bilden jeweils die Aufspannschultern 40 bzw. 41. In den Niederhalter 22 sind entsprechende Gewindebuchsen 46 eingesetzt, in welchen jeweils eine der Spannschrauben 42 mit definiertem Anzugsmoment eingeschraubt ist. Die Distanzhülse 45 steht an der dem Befestigungsflansch 49 des Ansaugrohrs 13 zugekehrten Unterseite des Verteilergehäuses 10 über letzteres geringfügig vor, so daß bei am Ansaugrohr 13 verspanntem Kraftstoffverteiler zwischen dem Verteilergehäuse 10 und dem Befestigungsflansch 49 des Ansaugrohrs 13 ein kleiner Spalt 48 verbleibt. Die elastische Hülse 36 kann ebenfalls um das gleiche Maß über das Verteilergehäuse 10 vorstehen, was jedoch nicht zwingend ist. Der Schraubenschaft der Spannschraube 43 ist in einer Gewindebohrung 47 im Befestigungsflansch 49 ebenfalls mit definiertem Anzugsmoment eingeschraubt. Die beiden Distanzhülsen 44,45 ermöglichen bei der Kunststoffausführung von Verteilergehäuse 10 und Niederhalter 22 das Aufbringen eines genau definierten Anzugsmoments der Spannschrauben 42,43. Verteilergehäuse 10 und Niederhalter 22 können bei ansonst gleichem Aufbau des Kraftstoffverteilers auch aus Metall hergestellt werden.Each clamping element 33, 34 is formed by a clamping screw 42, 43 and a metallic spacer sleeve 44 or 45 surrounding the screw shaft. The undersides of the screw heads each form the clamping shoulders 40 and 41. Corresponding threaded bushes 46 are inserted into the hold-down device 22, in each of which one of the clamping screws 42 is screwed in with a defined tightening torque. The spacer sleeve 45 protrudes slightly on the underside of the distributor housing 10 facing the mounting flange 49 of the intake pipe 13, so that a small gap 48 remains between the distributor housing 10 and the mounting flange 49 of the intake pipe 13 when the fuel distributor is braced on the intake pipe 13. The elastic sleeve 36 can also protrude by the same amount over the distributor housing 10, but this is not mandatory. The screw shaft of the clamping screw 43 is also screwed into a threaded bore 47 in the mounting flange 49 with a defined tightening torque. The two spacer sleeves 44, 45 enable the application of a precisely defined tightening torque of the clamping screws 42, 43 to the plastic design of the distributor housing 10 and hold-down device 22. The distributor housing 10 and hold-down device 22 can also be made of metal with the fuel distributor being otherwise of the same construction.

Claims (8)

  1. Fuel distributor for fuel injection systems of internal combustion engines, having a distributor housing (10) with a plurality of accommodation holes (11), which are connected together by a fuel supply conduit and accommodate electromagnetically actuated fuel injection valves (17), having a holding-down unit (22) firmly clamped to the distributor housing (10) for restraining the fuel injection valves (17) in the accommodation holes (11), which holding-down unit (22) is located on a support flange (24) on the distributor housing (10) by means of a clamping flange (23) at least near each accommodation hole (11), having a seal (25) arranged between the clamping flange (23) and the support flange (24) and having fastening means for fastening the fuel distributor on the induction pipe (13) of the internal combustion engine, characterized in that the seal between the clamping and support flanges (23, 24) is configured as a noise-decoupling gasket (25), in elastomer for example, and in that each fastening means (32) has an elastic sleeve (36), in elastomer for example, which is inserted in mutually aligned passage holes (38, 39) in the distributor housing (10) and the holding-down unit (22), and has a clamping element (34) which can be anchored in a fastening flange (49) on the induction pipe (13), penetrates the sleeve (36) while pressing it radially onto the hole walls and, by means of a clamping shoulder (41) which is not larger than the outer diameter of the sleeve (36), laps over the latter at its end facing away from the induction pipe (13).
  2. Distributor according to Claim 1, characterized in that the clamping element (34) is formed by a clamping screw (43), the diameter of whose head is slightly smaller than the outer diameter of the sleeve (36) and whose stem can be screwed with a defined tightening torque into a threaded hole (47) in the fastening flange (49) on the induction pipe (13), and by a stiff, preferably metallic, distance sleeve (45) which encloses the stem of the screw and on which the head of the screw is supported.
  3. Distributor according to Claim 2, characterized in that a small end section of the distance sleeve (45) projects out of the passage hole (39) at the end of the latter which faces towards the fastening flange (49) on the induction pipe (13).
  4. Distributor according to one of Claims 1 to 3, characterized in that the holding-down unit (22) and the distributor housing (10) are connected together by means of further fastening means (31).
  5. Distributor according to Claim 4, characterized in that each further fastening means (31) has an elastic sleeve (35), in elastomer for example, which is inserted in a passage hole (37) in the distributor housing (10), and a clamping element (33) which can be anchored in the holding-down unit (22), penetrates the sleeve (35) while pressing it radially onto the hole wall and, by means of a clamping shoulder (40) which is not larger than the outer diameter of the sleeve (35), laps over the latter at its end facing away from the holding-down unit (22).
  6. Distributor according to Claim 5, characterized in that the clamping element (33) is formed by a clamping screw (42), the diameter of whose head is slightly smaller than the outer diameter of the sleeve (35) and whose stem can be screwed into a threaded bush (46) inserted in the holding-down unit (22), and by a stiff, preferably metallic, distance sleeve (44) which encloses the stem of the screw and on which the head of the screw is supported.
  7. Distributor according to one of Claims 1 to 6, characterized in that a contact surface (16) of the distributor housing (10) is located on the fastening flange (49) of the induction pipe (13) at least in the region of the accommodation holes (11) and in that an elastic sealing ring (15), in elastomer for example, is inserted between the contact surface (16) and the fastening flange (49).
  8. Distributor according to one of Claims 1 to 7, characterized in that the holding-down unit (22) is, at the same time, configured as a contact strip for making electrical contact with the fuel injection valves (17) and has plug-in contacts (26) and connecting cables (27) leading to the plug-in contacts (26), which connecting cables (27) are led within cable passages (29), and in that the connecting cables (27) are fixed in the cable passages (29), for example by mechanical fastening elements (30) or by grouting or by foam-filling.
EP90905184A 1989-05-09 1990-04-05 Fuel distributor for fuel injection installations in internal combustion engines Expired - Lifetime EP0471676B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE3915111 1989-05-09
DE3915111A DE3915111A1 (en) 1989-05-09 1989-05-09 FUEL DISTRIBUTOR FOR FUEL INJECTION SYSTEMS OF INTERNAL COMBUSTION ENGINES
PCT/DE1990/000267 WO1990013740A1 (en) 1989-05-09 1990-04-05 Fuel distributor for fuel injection installations in internal combustion engines

Publications (2)

Publication Number Publication Date
EP0471676A1 EP0471676A1 (en) 1992-02-26
EP0471676B1 true EP0471676B1 (en) 1994-07-20

Family

ID=6380308

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Application Number Title Priority Date Filing Date
EP90905184A Expired - Lifetime EP0471676B1 (en) 1989-05-09 1990-04-05 Fuel distributor for fuel injection installations in internal combustion engines

Country Status (6)

Country Link
US (1) US5172671A (en)
EP (1) EP0471676B1 (en)
JP (1) JPH04505042A (en)
KR (1) KR920700348A (en)
DE (2) DE3915111A1 (en)
WO (1) WO1990013740A1 (en)

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Also Published As

Publication number Publication date
DE3915111A1 (en) 1990-11-15
KR920700348A (en) 1992-02-19
US5172671A (en) 1992-12-22
JPH04505042A (en) 1992-09-03
EP0471676A1 (en) 1992-02-26
DE59006523D1 (en) 1994-08-25
WO1990013740A1 (en) 1990-11-15

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