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EP0813651B1 - Fuel injection system - Google Patents

Fuel injection system Download PDF

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Publication number
EP0813651B1
EP0813651B1 EP96945492A EP96945492A EP0813651B1 EP 0813651 B1 EP0813651 B1 EP 0813651B1 EP 96945492 A EP96945492 A EP 96945492A EP 96945492 A EP96945492 A EP 96945492A EP 0813651 B1 EP0813651 B1 EP 0813651B1
Authority
EP
European Patent Office
Prior art keywords
fuel injection
fuel
injection system
plastic
intake pipe
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
EP96945492A
Other languages
German (de)
French (fr)
Other versions
EP0813651A1 (en
Inventor
Udo Hafner
Eckhard Bodenhausen
Thomas Gregorius
Thomas NÄGER
Thomas Raff
Albert Staacke
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 EP0813651A1 publication Critical patent/EP0813651A1/en
Application granted granted Critical
Publication of EP0813651B1 publication Critical patent/EP0813651B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • 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
    • F02M69/042—Positioning of injectors with respect to engine, e.g. in the air intake conduit
    • F02M69/044—Positioning of injectors with respect to engine, e.g. in the air intake conduit for injecting into the intake conduit downstream of an air throttle valve
    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10006—Air intakes; Induction systems characterised by the position of elements of the air intake system in direction of the air intake flow, i.e. between ambient air inlet and supply to the combustion chamber
    • F02M35/10072—Intake runners
    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10209—Fluid connections to the air intake system; their arrangement of pipes, valves or the like
    • F02M35/10216—Fuel injectors; Fuel pipes or rails; Fuel pumps or pressure regulators
    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10314—Materials for intake systems
    • F02M35/10321—Plastics; Composites; Rubbers
    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/1034—Manufacturing and assembling intake systems
    • F02M35/10347—Moulding, casting or the like
    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/104—Intake manifolds
    • F02M35/112—Intake manifolds for engines with cylinders all in one line
    • 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0671—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto
    • F02M51/0682—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto the body being hollow and its interior communicating with the fuel flow
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • 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
    • 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
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/50—Arrangements of springs for valves used in fuel injectors or fuel injection pumps
    • F02M2200/505—Adjusting spring tension by sliding spring seats
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2225/00—Synthetic polymers, e.g. plastics; Rubber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2225/00—Synthetic polymers, e.g. plastics; Rubber
    • F05C2225/08—Thermoplastics

Definitions

  • the invention is based on a fuel injection system according to the genus of the main claim.
  • a fuel injection system is already known that a cylinder head of an internal combustion engine is mountable.
  • This fuel injection system includes several Intake lines that isolate into structure-borne noise elastic connecting pipe element open, which in turn with a flange is formed on the cylinder head side, with the a fixed connection to the cylinder head is realized.
  • the elastic connecting pipe element which is preferably made of is made of an elastomeric plastic partially on the suction lines and also has one sleeve-shaped receptacle for a fuel injector.
  • the receptacle is in one piece with the connecting tube element executed and surrounds the fuel injector in the installed condition over almost its entire Extension length. So the fuel injection system is formed in several parts, the complete Fuel injector is mounted in the receptacle that thus a holding device for the Fuel injector represents. The recording is included designed so that the outer contour of the Fuel injector is largely true to form.
  • EP-OS 0 501 612 is already a Fuel injection system known, the multi-part Has suction pipes that have flanges at their ends, with which they are interconnected.
  • the intake pipes are made of either aluminum or plastic and have next to their actual flow passages Receiving areas for fuel injectors.
  • This Recording areas each surround one Fuel injector largely with radial clearance, there z.
  • B. the fuel supply via the receiving areas to the so-called side feed injectors trained fuel injectors.
  • the Fuel injectors only become complete installed in these receiving areas.
  • a seal of the fuel injector in the Receiving areas must have at least two sealing rings respectively.
  • WO 92/02727 A is already a Fuel injection system for an internal combustion engine known that at least one intake pipe and at least one Includes fuel injector.
  • the Fuel injector is known with all Valve components equipped and at least partially by surrounded by a plastic encapsulation. Always done mounted fuel injector is in a to the Intake pipes provided valve seat used.
  • the Valve receptacles are also integral to one Plastic component comprising intake pipes.
  • the Fuel injector is therefore an overall component can be assembled and disassembled in a valve seat.
  • Embodiments of the invention are in the drawing shown in simplified form and in the following Description explained in more detail. It shows figure linen partial section through an inventive Fuel injection system, Figure 2 a Fuel injection system with single connector Fuel injectors and Figure 3 a Fuel injection system with a central plug.
  • FIG. 1 shows a partial section through Fuel injection system, among other things, at least one Fuel injector 1 comprises, which Fuel injection system especially as part of one Fuel injection system from mixture-compressing, spark ignition internal combustion engines is used.
  • In 1 is only one fuel injector on average 1 in connection with a single suction pipe Intake pipe 3 shown, the one not shown Combustion chamber of the internal combustion engine leads.
  • fuel injection system is usually for one MPI (multi-point injection) may be provided, in which, for. B. each combustion chamber of the internal combustion engine Fuel injector 1 is assigned.
  • a Internal combustion engine with four combustion chambers (4-cylinder engine) so run z. B. in the fuel injection system four Intake pipes 3 in the direction of the combustion chambers, one each Fuel injection valve 1 opens into an intake pipe 3.
  • Fuel injectors 1 for use in the Fuel injection system according to the invention are for Example so-called top feed injectors suitable at which the fuel supply through the intake manifold opposite end occurs.
  • top feed injectors suitable at which the fuel supply through the intake manifold opposite end occurs.
  • DE-OS 43 25 842 is already known, with differences of course in Area of plastic extrusion through the design of the fuel injection system according to the invention.
  • Other types of already known injection valves can also be used in the fuel injection system.
  • the fuel injector 1 is actuated in known manner z. B. electromagnetic.
  • the Fuel injector 1 therefore has one electromagnetic circuit with a Solenoid 5, one as a fuel inlet connector and Inner pole serving core 6 and an armature 7. Downstream the solenoid 5 extends a valve seat support 8, the partially the housing of the fuel injector 1 forms.
  • a Valve needle 9 arranged at its upstream end with the armature 7 and at its downstream end with a Valve closing body 10 is firmly connected.
  • the electromagnetic circuit is used for the injection valve.
  • a Valve seat body 12 tightly mounted, of a fixed Has valve seat, with which in turn Valve closing body 10 cooperates.
  • the fuel to be sprayed is, for example, via a pot-shaped spray plate 14 metered with the fixed is connected to the valve seat body 12 and at least one, for example four formed by eroding or stamping Has spray openings.
  • On the immediately downstream End of the valve seat carrier 8 is, for. B. a protective cap 15 arranged.
  • the magnet coil 5 is of at least one, z. B. trained as a bracket and as a ferromagnetic Element serving guide element 16 surrounding the Magnetic coil 5 at least partially surrounds in the circumferential direction and with its two ends on the core 6 and Valve seat support 8 abuts and firmly connected to them is.
  • a fuel filter 19 for filtering out Fuel constituents causing constipation and a Adjustment sleeve 20 for adjusting the spring preload Return spring 11 is provided.
  • the fuel injector 1 is not as before known with a plastic encapsulation as one in one Inclusion of a fuel injection system that can be installed Component in front, but is directly in the Fuel injection system integrated according to the invention.
  • a plastic casing 25 in one piece with the intake pipes 3 as a compact Fuel injection system is designed and therefore also in a plastic injection molding process is produced.
  • this Plastic jacket 25 also belongs to, for example each fuel injector 1 is provided co-molded electrical connector 26.
  • a fuel distributor 28 is also directly in the Fuel injection system provided, which is ultimately direct from the plastic jacket 25 of Fuel injector 1 is formed.
  • a fuel distributor 28 is also directly in the Fuel injection system provided, which is ultimately direct from the plastic jacket 25 of Fuel injector 1 is formed.
  • At the Injection molding is immediate in the injection mold above the inlet end of the Fuel injector 1 a across the Longitudinal valve axes 29 of fuel injection valves 1 extending injection molding core provided by the after Remove a fuel supply channel 30 for the Fuel injection valves 1 in the plastic casing 25 is formed.
  • Fuel supply channel 30 has, for example circular cross-section, the wall of the Fuel supply channel 30 plastic with a largely constant wall thickness is present.
  • the plastic jacket 25 with different Wall thicknesses should be formed depending on the Installation requirements.
  • the insertion depth determines this of the valve seat body 12 in the valve seat support 8 the size of the Strokes of the valve needle 9.
  • An end position of the valve needle 9 is when the solenoid 5 is not excited by the system of Valve closing body 10 on the valve seat of the valve seat body 12 set; the other end position of the valve needle 9 results when the solenoid 5 is excited by the system of Anchor 7 on the core 6.
  • the spring tension on the Valve needle 9 supporting return spring 11 is how already mentioned, adjusted by the adjusting sleeve 20.
  • the Sealing the solenoid 5 against that Fuel supply channel 30 takes place, for. B. over several Perimeter of core 6 near fuel rail 28 provided annular circumferential ribs 32, the one form so-called labyrinth seals. On the other hand, could also an ordinary one arranged on the circumference of the core 6 Be molded around.
  • the downstream area is 24 of fuel injector 1 exposed, d. H. there is no valve seat support 8 there Plastic. Rather, this area 24 projects into one Side mouth 33 of the intake pipe 3, for example one has circular cross section.
  • the Fuel injector 1 is z. B. aligned so that the fuel to be sprayed off essentially directly an intake valve, not shown, in the cylinder head Internal combustion engine aims. It is also conceivable that Fuel injector 1 extended and it thus allowing the side mouth 33 to protrude completely, the spray end of the fuel injector 1 to reaches into the intake pipe 3, as the dashed lines to hint.
  • FIGs 2 and 3 schematically show exemplary embodiments of the fuel injection system as a compact component Attachment to the cylinder head of the internal combustion engine.
  • the Intake pipes 3 end on a mounting flange 37, the z. B. has several openings 38 in the Fasteners for connecting the Fuel injection system insertable with the cylinder head are.
  • the individual fuel injection valves 1 are at the embodiment shown in Figure 2 separately contacted each other, d. H. each Fuel injector 1 has its own Connector 26, the z. B. the one in FIG can have the shape shown.
  • the intake pipes 3 run as so-called swing pipes at least in the described Fuel injection system separately and together form one Intake manifold.
  • the fuel rail 28 extends with its inner fuel supply channel 30 along of all fuel injectors 1, so that a simultaneous fuel supply for everyone Fuel injection valves 1 is possible.
  • the fuel distributor 28 has a connection element 40 on.
  • the connecting element 40 is z. B. in the form of a Nozzle trained, on which a not shown Fuel supply hose can be attached, or represents a so-called "quick connector" with which Bayonet-like quick connections can be achieved.
  • FIG. 3 shows an embodiment of the Fuel injection system shown in which the electrical contacting of the individual Fuel injection valves 1 via a contact rail 41 takes place, all the fuel injection valves 1 with each other combines.
  • the contact rail 41 which is directly at Injection molding of the fuel injection system is also provided and is completely encapsulated by plastic, has a central plug 42 at one contacting end, the z. B. with four to be contacted Fuel injection valves 1 is designed five poles.
  • the Number of 41 provided in the contact rail electrical lines 43 decrease with each Fuel injector 1 by one to Central connector 42 furthest away Fuel injector 1, two more electric Lead lines 43.
  • the contact rail 41 and the Fuel distributors 28 are by no means in FIG. 3 shown to scale and need not be separate run side by side or one above the other. Rather it is of advantage, the electrical lines 43 immediately in or to integrate the fuel distributor 28, so that only a transverse to the fuel injection valves 1 Plastic connector is present.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Abstract

PCT No. PCT/DE96/01939 Sec. 371 Date Dec. 18, 1997 Sec. 102(e) Date Dec. 18, 1997 PCT Filed Oct. 11, 1996 PCT Pub. No. WO97/25529 PCT Pub. Date Jul. 17, 1997A fuel injection system includes a substantial integration of various components, the fuel injection system including at least one fuel injector and at least one intake manifold, as well as a fuel supply channel, which are all surrounded by a plastic sheathing. The full integration of the fuel injectors into an induction pipe component made of plastic leads to the reduction or elimination of both electrical and hydraulic interfaces. Thus, only a compact component remains that is very simple to attach to a cylinder head of an internal combustion engine. Means for electrically contacting the fuel injectors (1), such as connector sockets, are also fully integrated in the plastic sheathing. This fuel injection system is especially suited for use in mixture-compressing internal combustion engines having externally supplied ignition.

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Brennstoffeinspritzsystem nach der Gattung des Hauptanspruchs. Aus der EP-PS 0 139 122 ist bereits ein Brennstoffeinspritzsystem bekannt, das an einem Zylinderkopf einer Brennkraftmaschine montierbar ist. Dieses Brennstoffeinspritzsystem umfaßt mehrere Ansaugleitungen, die in ein Körperschall isolierendes, elastisches Verbindungsrohrelement münden, das wiederum mit einem Flansch zylinderkopfseitig ausgebildet ist, mit dem eine feste Verbindung zum Zylinderkopf realisiert wird. Das elastische Verbindungsrohrelement, das vorzugsweise aus einem Elastomerkunststoff hergestellt ist, nimmt also teilweise die Ansaugleitungen auf und besitzt zudem eine hülsenförmige Aufnahme für ein Brennstoffeinspritzventil. Die Aufnahme ist einstückig mit dem Verbindungsrohrelement ausgeführt und umgibt das Brennstoffeinspritzventil im eingebauten Zustand über fast seine gesamte Erstreckungslänge. Das Brennstoffeinspritzsystem ist also mehrteilig ausgebildet, wobei das komplette Brennstoffeinspritzventil in der Aufnahme montiert wird, die somit eine Halteeinrichtung für das Brennstoffeinspritzventil darstellt. Die Aufnahme ist dabei so gestaltet, daß die Außenkontur des Brennstoffeinspritzventils weitgehend formtreu umgeben wird. The invention is based on a fuel injection system according to the genus of the main claim. From EP-PS 0 139 122 a fuel injection system is already known that a cylinder head of an internal combustion engine is mountable. This fuel injection system includes several Intake lines that isolate into structure-borne noise elastic connecting pipe element open, which in turn with a flange is formed on the cylinder head side, with the a fixed connection to the cylinder head is realized. The elastic connecting pipe element, which is preferably made of is made of an elastomeric plastic partially on the suction lines and also has one sleeve-shaped receptacle for a fuel injector. The receptacle is in one piece with the connecting tube element executed and surrounds the fuel injector in the installed condition over almost its entire Extension length. So the fuel injection system is formed in several parts, the complete Fuel injector is mounted in the receptacle that thus a holding device for the Fuel injector represents. The recording is included designed so that the outer contour of the Fuel injector is largely true to form.

Aus der EP-OS 0 501 612 ist bereits ein Brennstoffeinspritzsystem bekannt, das mehrteilige Ansaugrohre aufweist, die an ihren Enden Flansche besitzen, mit denen sie untereinander verbunden sind. Die Ansaugrohre sind entweder aus Aluminium oder Kunststoff gefertigt und haben neben ihren eigentlichen Strömungspassagen Aufnahmebereiche für Brennstoffeinspritzventile. Diese Aufnahmebereiche umgeben jeweils ein Brennstoffeinspritzventil weitgehend mit radialem Abstand, da z. B. die Brennstoffversorgung über die Aufnahmebereiche zu den als sogenannte Side-Feed-Einspritzventile ausgebildeten Brennstoffeinspritzventilen erfolgt. Die Brennstoffeinspritzventile werden erst in vollständig montiertem Zustand in diese Aufnahmebereiche eingesetzt. Eine Abdichtung des Brennstoffeinspritzventils in den Aufnahmebereichen muß mit wenigstens zwei Dichtringen erfolgen.From EP-OS 0 501 612 is already a Fuel injection system known, the multi-part Has suction pipes that have flanges at their ends, with which they are interconnected. The intake pipes are made of either aluminum or plastic and have next to their actual flow passages Receiving areas for fuel injectors. This Recording areas each surround one Fuel injector largely with radial clearance, there z. B. the fuel supply via the receiving areas to the so-called side feed injectors trained fuel injectors. The Fuel injectors only become complete installed in these receiving areas. A seal of the fuel injector in the Receiving areas must have at least two sealing rings respectively.

Aus der WO 92/02727 A ist bereits ein Brennstoffeinspritzsystem für eine Brennkraftmaschine bekannt, das wenigstens ein Ansaugrohr und wenigstens ein Brennstoffeinspritzventil umfasst. Das Brennstoffeinspritzventil ist mit allen bekannten Ventilbauteilen ausgestattet und zumindest teilweise von einer Kunststoffumspritzung umgeben. Das jeweils fertig montierte Brennstoffeinspritzventil wird in eine an den Ansaugrohren vorgesehene Ventilaufnahme eingesetzt. Die Ventilaufnahmen sind dabei einstückig an einem auch die Ansaugrohre umfassenden Kunststoffbauteil mitausgeführt.From WO 92/02727 A is already a Fuel injection system for an internal combustion engine known that at least one intake pipe and at least one Includes fuel injector. The Fuel injector is known with all Valve components equipped and at least partially by surrounded by a plastic encapsulation. Always done mounted fuel injector is in a to the Intake pipes provided valve seat used. The Valve receptacles are also integral to one Plastic component comprising intake pipes.

Zwischen dem Einspritzventil und der Ventilaufnahme ist ein Ringraum gebildet, über den die Versorgung des Einspritzventils mit Brennstoff ermöglicht wird. Mit zwei Dichtringen ist das Brennstoffeinspritzventil gegen die Ventilaufnahme des Ansaugmoduls abgedichtet. Das Brennstoffeinspritzventil ist also als Gesamtbaukomponente in einer Ventilaufnahme montierbar und demontierbar.There is a between the injection valve and the valve seat Annulus formed over which the supply of the Fuel injector is enabled. With two Sealing rings is the fuel injector against the Valve holder of the intake module sealed. The Fuel injector is therefore an overall component can be assembled and disassembled in a valve seat.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Brennstoffeinspritzsystem mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß auf einfache Art und Weise eine deutliche Kostenersparnis erzielt wird. Die Kostenreduzierung ist deshalb erreichbar, weil eine Integration der verschiedenen Komponenten des Brennstoffeinspritzsystems in extremem Maße vorgenommen ist. Die Vollintegration der Einspritzventile an einem aus Kunststoff ausgebildeten Ansaugrohr bzw. Ansaugverteiler führt dazu, daß sowohl elektrische als auch hydraulische Schnittstellen des Brennstoffeinspritzsystems reduziert bzw. ganz und gar vermieden werden. Außerdem ergeben sich durch den vorteilhaften Wegfall von Verbindungselementen und Dichtungselementen weitere Einsparungen an Bauteilen und somit auch an Material. Die Vielzahl der sich aus der Vollintegration ergebenden Vorteile soll in Kurzform nun noch einmal zusammengefaßt werden:

  • Wegfall der eigentlichen Kunststoffumspritzung am Brennstoffeinspritzventil,
  • Wegfall eines Bauteils zur Brennstoffversorgung (Brennstoffverteiler),
  • Wegfall von mehreren Verbindungselementen (Sicherungsringe, Schrauben und anderes),
  • Wegfall von verschiedenen Dichtungselementen (O-Ringe),
  • Wegfall mehrerer Montagevorgänge aufgrund der Einteiligkeit.
The fuel injection system according to the invention with the characterizing features of the main claim has the advantage that a significant cost saving is achieved in a simple manner. The cost reduction can be achieved because the various components of the fuel injection system have been integrated to an extreme extent. The full integration of the injection valves on an intake pipe or intake manifold made of plastic means that both electrical and hydraulic interfaces of the fuel injection system are reduced or completely avoided. In addition, the advantageous omission of connecting elements and sealing elements results in further savings in components and thus also in material. The large number of advantages resulting from full integration should now be summarized again briefly:
  • Elimination of the actual plastic encapsulation on the fuel injector,
  • Omission of a component for fuel supply (fuel distributor),
  • Omission of several connecting elements (circlips, screws and others),
  • Omission of various sealing elements (O-rings),
  • Elimination of several assembly processes due to the one-piece design.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Hauptanspruch angegebenen Brennstoffeinspritzsystems möglich.By the measures listed in the subclaims advantageous further developments and improvements of the Main claim specified fuel injection system possible.

Besonders vorteilhaft ist es, elektrische Leitungen zur gemeinsamen elektrischen Kontaktierung der Brennstoffeinspritzventile in dem der Brennstoffversorgung der Brennstoffeinspritzventile dienenden Brennstoffverteiler zu integrieren. Für den elektrischen Anschluß des Brennstoffeinspritzsystems nach außen ist dann nur ein Zentralstecker notwendig.It is particularly advantageous to use electrical lines common electrical contacting of the Fuel injectors in the fuel supply the fuel distributor serving fuel injectors to integrate. For the electrical connection of the The fuel injection system to the outside is then only one Central plug necessary.

Zeichnungdrawing

Ausführungsbeispiele der Erfindung sind in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur leinen teilweisen Schnitt durch ein erfindungsgemäßes Brennstoffeinspritzsystem, Figur 2 ein Brennstoffeinspritzsystem mit Einzelstecker aufweisenden Brennstoffeinspritzventilen und Figur 3 ein Brennstoffeinspritzsystem mit einem Zentralstecker.Embodiments of the invention are in the drawing shown in simplified form and in the following Description explained in more detail. It shows figure linen partial section through an inventive Fuel injection system, Figure 2 a Fuel injection system with single connector Fuel injectors and Figure 3 a Fuel injection system with a central plug.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Die Figur 1 zeigt einen teilweisen Schnitt durch ein Brennstoffeinspritzsystem, das unter anderem wenigstens ein Brennstoffeinspritzventil 1 umfaßt, wobei das Brennstoffeinspritzsystem besonders als Teil einer Brennstoffeinspritzanlage von gemischverdichtenden, fremdgezündeten Brennkraftmaschinen zum Einsatz kommt. In der Figur 1 ist im Schnitt nur ein Brennstoffeinspritzventil 1 in Verbindung zu einem als Einzelsaugrohr ausgebildeten Ansaugrohr 3 dargestellt, das zu einem nicht gezeigten Brennraum der Brennkraftmaschine führt. Das Brennstoffeinspritzsystem wird in der Regel jedoch für eine MPI (Multi-Point-Injection) vorgesehen sein, bei der z. B. jedem Brennraum der Brennkraftmaschine ein Brennstoffeinspritzventil 1 zugeordnet ist. Bei einer Brennkraftmaschine mit vier Brennräumen (4-Zylinder-Motor) verlaufen also z. B. im Brennstoffeinspritzsystem vier Ansaugrohre 3 in Richtung der Brennräume, wobei jeweils ein Brennstoffeinspritzventil 1 in ein Ansaugrohr 3 mündet. Über das beispielsweise einen kreisförmigen Querschnitt aufweisende Ansaugrohr 3 wird Ansaugluft bzw. rückgeführtes Abgas in der mit einem Pfeil angegebenen Richtung für die Brennkraftmaschine bereitgestellt, wobei die Steuerung der Luftmenge über ein nicht dargestelltes Drosselorgan stromaufwärts der Mündung des Brennstoffeinspritzventils 1 im Ansaugrohr 3 erfolgt.Figure 1 shows a partial section through Fuel injection system, among other things, at least one Fuel injector 1 comprises, which Fuel injection system especially as part of one Fuel injection system from mixture-compressing, spark ignition internal combustion engines is used. In 1 is only one fuel injector on average 1 in connection with a single suction pipe Intake pipe 3 shown, the one not shown Combustion chamber of the internal combustion engine leads. The However, fuel injection system is usually for one MPI (multi-point injection) may be provided, in which, for. B. each combustion chamber of the internal combustion engine Fuel injector 1 is assigned. At a Internal combustion engine with four combustion chambers (4-cylinder engine) so run z. B. in the fuel injection system four Intake pipes 3 in the direction of the combustion chambers, one each Fuel injection valve 1 opens into an intake pipe 3. about for example a circular cross section having intake pipe 3 becomes intake air or recirculated Exhaust gas in the direction indicated by an arrow for the Internal combustion engine provided, the control of the Air volume via a throttle element, not shown upstream of the mouth of the fuel injector 1 takes place in the intake pipe 3.

Als Brennstoffeinspritzventile 1 für den Einsatz in dem erfindungsgemäßen Brennstoffeinspritzsystem sind zum Beispiel sogenannte Top-Feed-Einspritzventile geeignet, bei denen die Brennstoffversorgung über das dem Ansaugrohr abgewandte Ende erfolgt. Auf eine detaillierte Beschreibung des beispielhaft und vereinfacht dargestellten Brennstoffeinspritzventils wird verzichtet, da ein solches Brennstoffeinspritzventil z. B. weitgehend aus der DE-OS 43 25 842 bereits bekannt ist, wobei sich Unterschiede natürlich im Bereich der Kunststoffumspritzung durch die Ausgestaltung des erfindungsgemäßen Brennstoffeinspritzsystems ergeben. Andere Bauarten bereits bekannter Einspritzventile können ebenso in dem Brennstoffeinspritzsystem zum Einsatz kommen.As fuel injectors 1 for use in the Fuel injection system according to the invention are for Example so-called top feed injectors suitable at which the fuel supply through the intake manifold opposite end occurs. On a detailed description of the illustrated and simplified Fuel injector is dispensed with as such Fuel injector z. B. largely from DE-OS 43 25 842 is already known, with differences of course in Area of plastic extrusion through the design of the fuel injection system according to the invention. Other types of already known injection valves can can also be used in the fuel injection system.

Die Betätigung des Brennstoffeinspritzventils 1 erfolgt in bekannter Weise z. B. elektromagnetisch. Das Brennstoffeinspritzventil 1 besitzt deshalb einen elektromagnetischen Kreis unter anderem mit einer Magnetspule 5, einem als Brennstoffeinlaßstutzen und Innenpol dienenden Kern 6 und einem Anker 7. Stromabwärts der Magnetspule 5 erstreckt sich ein Ventilsitzträger 8, der teilweise das Gehäuse des Brennstoffeinspritzventils 1 bildet. In dem rohrförmigen Ventilsitzträger 8 ist eine Ventilnadel 9 angeordnet, die an ihrem stromaufwärtigen Ende mit dem Anker 7 und an ihrem stromabwärtigen Ende mit einem Ventilschließkörper 10 fest verbunden ist. Zur axialen Bewegung der Ventilnadel 9 und damit zum Öffnen entgegen der Federkraft einer Rückstellfeder 11 bzw. Schließen des Einspritzventils dient der elektromagnetische Kreis. In das dem Kern 6 abgewandte Ende des Ventilsitzträgers 8 ist ein Ventilsitzkörper 12 dicht montiert, der einen festen Ventilsitz aufweist, mit dem wiederum der Ventilschließkörper 10 zusammenwirkt.The fuel injector 1 is actuated in known manner z. B. electromagnetic. The Fuel injector 1 therefore has one electromagnetic circuit with a Solenoid 5, one as a fuel inlet connector and Inner pole serving core 6 and an armature 7. Downstream the solenoid 5 extends a valve seat support 8, the partially the housing of the fuel injector 1 forms. In the tubular valve seat support 8 is one Valve needle 9 arranged at its upstream end with the armature 7 and at its downstream end with a Valve closing body 10 is firmly connected. For axial Movement of the valve needle 9 and thus to open against the Spring force of a return spring 11 or closing the The electromagnetic circuit is used for the injection valve. In the The end of the valve seat carrier 8 facing away from the core 6 is a Valve seat body 12 tightly mounted, of a fixed Has valve seat, with which in turn Valve closing body 10 cooperates.

Der abzuspritzende Brennstoff wird beispielsweise über eine topffönnige Spritzlochscheibe 14 zugemessen, die fest mit dem Ventilsitzkörper 12 verbunden ist und wenigstens eine, beispielsweise vier durch Erodieren oder Stanzen ausgeformte Abspritzöffnungen aufweist. Am unmittelbar stromabwärtigen Ende des Ventilsitzträgers 8 ist z. B. eine Schutzkappe 15 angeordnet. Die Magnetspule 5 ist von wenigstens einem, z. B. als Bügel ausgebildeten und als ferromagnetisches Element dienenden Leitelement 16 umgeben, das die Magnetspule 5 in Umfangsrichtung wenigstens teilweise umgibt sowie mit seinen beiden Enden am Kern 6 bzw. am Ventilsitztrager 8 anliegt und mit diesen fest verbunden ist. In einer Strömungsbohrung 18 des Kerns 6 sind beispielsweise ein Brennstoffilter 19 zur Herausfiltrierung Verstopfungen verursachender Brennstoffbestandteile und eine Einstellhülse 20 zur Einstellung der Federvorspannung der Rückstellfeder 11 vorgesehen.The fuel to be sprayed is, for example, via a pot-shaped spray plate 14 metered with the fixed is connected to the valve seat body 12 and at least one, for example four formed by eroding or stamping Has spray openings. On the immediately downstream End of the valve seat carrier 8 is, for. B. a protective cap 15 arranged. The magnet coil 5 is of at least one, z. B. trained as a bracket and as a ferromagnetic Element serving guide element 16 surrounding the Magnetic coil 5 at least partially surrounds in the circumferential direction and with its two ends on the core 6 and Valve seat support 8 abuts and firmly connected to them is. In a flow bore 18 of the core 6 are for example a fuel filter 19 for filtering out Fuel constituents causing constipation and a Adjustment sleeve 20 for adjusting the spring preload Return spring 11 is provided.

Das Brennstoffeinspritzventil 1 liegt nicht wie bisher bekannt mit einer Kunststoffumspritzung als ein in eine Aufnahme eines Brennstoffeinspritzsystems einbaubares Bauteil vor, sondern ist unmittelbar im Brennstoffeinspritzsystem erfindungsgemäß integriert. Bis auf einen kleinen stromabwärtigen Bereich 24 des Brennstoffeinspritzventils 1 ist das Brennstoffeinspritzventil 1 vollständig von Kunststoff umgeben, wobei diese Kunststoffummantelung 25 einteilig mit den Ansaugrohren 3 als ein kompaktes Brennstoffeinspritzsystem ausgebildet ist und also auch in einem Kunststoffspritzgießprozeß hergestellt wird. Zu dieser Kunststoffummantelung 25 gehört beispielsweise auch ein für jedes Brennstoffeinspritzventil 1 vorgesehener mitangespritzter elektrischer Anschlußstecker 26.The fuel injector 1 is not as before known with a plastic encapsulation as one in one Inclusion of a fuel injection system that can be installed Component in front, but is directly in the Fuel injection system integrated according to the invention. To to a small downstream area 24 of the Fuel injector 1 is that Fuel injector 1 made entirely of plastic surrounded, this plastic casing 25 in one piece with the intake pipes 3 as a compact Fuel injection system is designed and therefore also in a plastic injection molding process is produced. To this Plastic jacket 25 also belongs to, for example each fuel injector 1 is provided co-molded electrical connector 26.

Außerdem ist auch ein Brennstoffverteiler 28 unmittelbar im Brennstoffeinspritzsystem vorgesehen, der letztlich direkt von der Kunststoffummantelung 25 des Brennstoffeinspritzventils 1 mitgebildet wird. Beim Spritzgießen ist dabei in dem Spritzgießwerkzeug unmittelbar oberhalb des zulaufseitigen Endes des Brennstoffeinspritzventils 1 ein quer zu den Ventillängsachsen 29 der Brennstoffeinspritzventile 1 verlaufender Spritzgießkern vorgesehen, durch den nach dem Entfernen ein Brennstoffversorgungskanal 30 für die Brennstoffeinspritzventile 1 in der Kunststoffummantelung 25 gebildet ist. Dieser zu jeder Strömungsbohrung 18 hin offene Brennstoffversorgungskanal 30 weist beispielsweise einen kreisförmigen Querschnitt auf, wobei der die Wandung des Brennstoffversorgungskanals 30 bildende Kunststoff mit einer weitgehend konstanten Wandstärke vorhanden ist. Über die axiale Erstreckung des Brennstoffeinspritzventils 1 gesehen kann die Kunststoffummantelung 25 mit verschiedenen Wandstärken ausgebildet sein, je nach den Einbauanforderungen.In addition, a fuel distributor 28 is also directly in the Fuel injection system provided, which is ultimately direct from the plastic jacket 25 of Fuel injector 1 is formed. At the Injection molding is immediate in the injection mold above the inlet end of the Fuel injector 1 a across the Longitudinal valve axes 29 of fuel injection valves 1 extending injection molding core provided by the after Remove a fuel supply channel 30 for the Fuel injection valves 1 in the plastic casing 25 is formed. This open to each flow bore 18 Fuel supply channel 30 has, for example circular cross-section, the wall of the Fuel supply channel 30 plastic with a largely constant wall thickness is present. About the seen axial extent of the fuel injector 1 can the plastic jacket 25 with different Wall thicknesses should be formed depending on the Installation requirements.

Zum Umspritzen der Brennstoffeinspritzventile 1 liegen diese bereits eingestellt vor. Dabei bestimmt die Einschubtiefe des Ventilsitzkörpers 12 im ventilsitzträger 8 die Größe des Hubs der Ventilnadel 9. Eine Endstellung der Ventilnadel 9 ist bei nicht erregter Magnetspule 5 durch die Anlage des Ventilschließkörpers 10 am Ventilsitz des Ventilsitzkörpers 12 festgelegt; die andere Endstellung der Ventilnadel 9 ergibt sich bei erregter Magnetspule 5 durch die Anlage des Ankers 7 am Kern 6. Die Federspannung der sich an der Ventilnadel 9 abstützenden Rückstellfeder 11 wird, wie bereits erwähnt, durch die Einstellhülse 20 eingestellt. Die Abdichtung der Magnetspule 5 gegenüber dem Brennstoffversorgungskanal 30 erfolgt z. B. über mehrere am Umfang des Kerns 6 nahe des Brennstoffverteilers 28 vorgesehene ringförmig umlaufende Rippen 32, die eine sogenannte Labyrinthdichtung bilden. Andererseits könnte auch ein gewöhnlicher, am Umfang des Kerns 6 angeordneter Dichtring mitumspritzt werden. For injection molding around the fuel injection valves 1, these are located already set before. The insertion depth determines this of the valve seat body 12 in the valve seat support 8 the size of the Strokes of the valve needle 9. An end position of the valve needle 9 is when the solenoid 5 is not excited by the system of Valve closing body 10 on the valve seat of the valve seat body 12 set; the other end position of the valve needle 9 results when the solenoid 5 is excited by the system of Anchor 7 on the core 6. The spring tension on the Valve needle 9 supporting return spring 11 is how already mentioned, adjusted by the adjusting sleeve 20. The Sealing the solenoid 5 against that Fuel supply channel 30 takes place, for. B. over several Perimeter of core 6 near fuel rail 28 provided annular circumferential ribs 32, the one form so-called labyrinth seals. On the other hand, could also an ordinary one arranged on the circumference of the core 6 Be molded around.

Um Kunststoff zu sparen, ist der stromabwärtige Bereich 24 des Brennstoffeinspritzventils 1 freiliegend ausgeführt, d. h. den Ventilsitzträger 8 umschließt dort kein Kunststoff. Vielmehr ragt dieser Bereich 24 in eine Seitenmündung 33 des Ansaugrohrs 3, die beispielsweise einen kreisförmigen Querschnitt besitzt. Das Brennstoffeinspritzventil 1 ist dabei z. B. so ausgerichtet, daß der abzuspritzende Brennstoff im wesentlichen direkt auf ein nicht gezeigtes Einlaßventil im Zylinderkopf der Brennkraftmaschine zielt. Denkbar ist auch, das Brennstoffeinspritzventil 1 verlängert auszubilden und es somit die Seitenmündung 33 völlig durchragen zu lassen, wobei das Abspritzende des Brennstoffeinspritzventils 1 bis in das Ansaugrohr 3 hineinreicht, wie es die Strichlinien andeuten sollen.To save plastic, the downstream area is 24 of fuel injector 1 exposed, d. H. there is no valve seat support 8 there Plastic. Rather, this area 24 projects into one Side mouth 33 of the intake pipe 3, for example one has circular cross section. The Fuel injector 1 is z. B. aligned so that the fuel to be sprayed off essentially directly an intake valve, not shown, in the cylinder head Internal combustion engine aims. It is also conceivable that Fuel injector 1 extended and it thus allowing the side mouth 33 to protrude completely, the spray end of the fuel injector 1 to reaches into the intake pipe 3, as the dashed lines to hint.

Die Figuren 2 und 3 zeigen schematisch Ausführungsbeispiele des Brennstoffeinspritzsystems als kompaktes Bauteil zur Befestigung an dem Zylinderkopf der Brennkraftmaschine. Die Ansaugrohre 3 enden an einem Befestigungsflansch 37, der z. B. mehrere Öffnungen 38 aufweist, in die Befestigungsmittel zum Verbinden des Brennstoffeinspritzsystems mit dem Zylinderkopf einführbar sind. Die einzelnen Brennstoffeinspritzventile 1 sind bei dem in der Figur 2 gezeigten Ausführungsbeispiel getrennt voneinander kontaktiert, d. h. jedes Brennstoffeinspritzventil 1 besitzt einen eigenen Anschlußstecker 26, der z. B. die in der Figur 1 dargestellte Form haben kann. Die Ansaugrohre 3 verlaufen als sogenannte Schwingrohre zumindest in dem beschriebenen Brennstoffeinspritzsystem separat und bilden zusammen eine Saugrohranlage. Der Brennstoffverteiler 28 erstreckt sich mit seinem inneren Brennstoffversorgungskanal 30 entlang aller Brennstoffeinspritzventile 1, so daß eine gleichzeitige Brennstoffversorgung aller Brennstoffeinspritzventile 1 möglich ist. An seinem einen Ende weist der Brennstoffverteiler 28 ein Anschlußelement 40 auf. Das Anschlußelement 40 ist dabei z. B. in Form eines Stutzens ausgebildet, an dem ein nicht gezeigter Brennstoffversorgungsschlauch befestigt werden kann, oder stellt einen sogenannten "quick connector" dar, mit dem bajonettähnliche Schnellverbindungen erzielbar sind.Figures 2 and 3 schematically show exemplary embodiments of the fuel injection system as a compact component Attachment to the cylinder head of the internal combustion engine. The Intake pipes 3 end on a mounting flange 37, the z. B. has several openings 38 in the Fasteners for connecting the Fuel injection system insertable with the cylinder head are. The individual fuel injection valves 1 are at the embodiment shown in Figure 2 separately contacted each other, d. H. each Fuel injector 1 has its own Connector 26, the z. B. the one in FIG can have the shape shown. The intake pipes 3 run as so-called swing pipes at least in the described Fuel injection system separately and together form one Intake manifold. The fuel rail 28 extends with its inner fuel supply channel 30 along of all fuel injectors 1, so that a simultaneous fuel supply for everyone Fuel injection valves 1 is possible. On his one At the end, the fuel distributor 28 has a connection element 40 on. The connecting element 40 is z. B. in the form of a Nozzle trained, on which a not shown Fuel supply hose can be attached, or represents a so-called "quick connector" with which Bayonet-like quick connections can be achieved.

In der Figur 3 ist ein Ausführungsbeispiel des Brennstoffeinspritzsystems dargestellt, bei dem die elektrische Kontaktierung der einzelnen Brennstoffeinspritzventile 1 über eine Kontaktschiene 41 erfolgt, die alle Brennstoffeinspritzventile 1 miteinander verbindet. Die Kontaktschiene 41, die direkt beim Spritzgießen des Brennstoffeinspritzsystems mit vorgesehen wird und so vollständig von Kunststoff umspritzt ist, besitzt an einem Kontaktierungsende einen Zentralstecker 42, der z. B. bei vier zu kontaktierenden Brennstoffeinspritzventilen 1 fünfpolig ausgelegt ist. Die Anzahl der in der Kontaktschiene 41 vorgesehenen elektrischen Leitungen 43 verringert sich mit jedem Brennstoffeinspritzventil 1 um eine bis zum vom Zentralstecker 42 am weitesten entfernt liegenden Brennstoffeinspritzventil 1, zu dem noch zwei elektrische Leitungen 43 führen. Die Kontaktschiene 41 und der Brennstoffverteiler 28 sind in der Figur 3 keineswegs maßstäblich dargestellt und müssen nicht separat nebeneinander bzw. übereinander verlaufen. Vielmehr ist es von Vorteil, die elektrischen Leitungen 43 unmittelbar im bzw. am Brennstoffverteiler 28 zu integrieren, so daß nur ein quer zu den Brennstoffeinspritzventilen 1 verlaufendes Kunststoffverbindungsstück vorhanden ist.3 shows an embodiment of the Fuel injection system shown in which the electrical contacting of the individual Fuel injection valves 1 via a contact rail 41 takes place, all the fuel injection valves 1 with each other combines. The contact rail 41, which is directly at Injection molding of the fuel injection system is also provided and is completely encapsulated by plastic, has a central plug 42 at one contacting end, the z. B. with four to be contacted Fuel injection valves 1 is designed five poles. The Number of 41 provided in the contact rail electrical lines 43 decrease with each Fuel injector 1 by one to Central connector 42 furthest away Fuel injector 1, two more electric Lead lines 43. The contact rail 41 and the Fuel distributors 28 are by no means in FIG. 3 shown to scale and need not be separate run side by side or one above the other. Rather it is of advantage, the electrical lines 43 immediately in or to integrate the fuel distributor 28, so that only a transverse to the fuel injection valves 1 Plastic connector is present.

Claims (9)

  1. Fuel injection system for an internal combustion engine with at least one intake pipe and with at least one fuel injection valve, which is surrounded directly by a plastic sheath (25), the plastic sheath (25) being of one-piece construction with the at least one intake pipe (3) and furthermore surrounding a fuel supply passage (30) for the at least one fuel injection valve (1), characterized in that the plastic sheath is designed as a plastic encapsulation of the fuel injection valve (1).
  2. Fuel injection system according to Claim 1, characterized in that the plastic encapsulation (25) has a fixing flange (37), by means of which the fuel injection system can be fixed on a cylinder head of the internal combustion engine and at which the at least one intake pipe (3) ends.
  3. Fuel injection system according to Claim 1 or 2, characterized in that at least two fuel injection valves (1) are provided, to each of which is assigned an intake pipe (3), and each intake pipe (3) is of separate construction from the other intake pipes (3).
  4. Fuel injection system according to Claim 3, characterized in that the fuel supply passage (30) extends transversely to the longitudinal axes (29) of the at least two fuel injection valves (1), the fuel supply passage forming with the plastic surrounding it a fuel distributor (28) that emerges directly from the plastic encapsulation (25) of the fuel injection valves (1).
  5. Fuel injection system according to Claim 1, characterized in that each individual fuel injection valve (1) has a connector plug (26) of one-piece construction with the plastic encapsulation (25) to enable it to be contacted electrically.
  6. Fuel injection system according to Claim 1, characterized in that all the fuel injection valves (1) are connected to electrical lines (43) of a contact bar (41), via which electrical contacting of the fuel injection valves (1) is achieved, the contact bar (41) likewise emerging in one piece from the plastic encapsulation (25) and ending with a central plug (42).
  7. Fuel injection system according to Claim 4 and 6, characterized in that the electrical lines (43) are integrated into the fuel distributor (28).
  8. Fuel injection system according to Claim 1, characterized in that the at least one fuel injection valve (1) has a core (6) that serves as a fuel inlet stub and an internal pole and that forms the inlet end of the fuel injection valve (1), the end facing the fuel supply passage (30), and the core (6) has on its outer circumference a plurality of ribs (32) that run around in a ring and are surrounded by the plastic encapsulation (25).
  9. Fuel injection system according to Claim 1, characterized in that a region (24) of the fuel injection valve (1) that forms the downstream end of the fuel injection valve (1) and faces the intake pipe (3) is not immediately surrounded by plastic and extends into a lateral opening (33) in the intake pipe (3).
EP96945492A 1996-01-08 1996-10-11 Fuel injection system Expired - Lifetime EP0813651B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19600378A DE19600378A1 (en) 1996-01-08 1996-01-08 Fuel injection system
DE19600378 1996-01-08
PCT/DE1996/001939 WO1997025529A1 (en) 1996-01-08 1996-10-11 Fuel injection system

Publications (2)

Publication Number Publication Date
EP0813651A1 EP0813651A1 (en) 1997-12-29
EP0813651B1 true EP0813651B1 (en) 2002-03-20

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EP96945492A Expired - Lifetime EP0813651B1 (en) 1996-01-08 1996-10-11 Fuel injection system

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US (1) US5934252A (en)
EP (1) EP0813651B1 (en)
JP (1) JP3805376B2 (en)
KR (1) KR19980702840A (en)
AT (1) ATE214786T1 (en)
DE (2) DE19600378A1 (en)
WO (1) WO1997025529A1 (en)

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DE102015209646A1 (en) * 2015-05-27 2016-12-01 Bayerische Motoren Werke Aktiengesellschaft Fuel injector

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DE102015209646A1 (en) * 2015-05-27 2016-12-01 Bayerische Motoren Werke Aktiengesellschaft Fuel injector

Also Published As

Publication number Publication date
WO1997025529A1 (en) 1997-07-17
EP0813651A1 (en) 1997-12-29
US5934252A (en) 1999-08-10
DE59608924D1 (en) 2002-04-25
JP3805376B2 (en) 2006-08-02
ATE214786T1 (en) 2002-04-15
KR19980702840A (en) 1998-08-05
DE19600378A1 (en) 1997-07-10
JPH11502282A (en) 1999-02-23

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