EP0682179B1 - Fuel injection valve - Google Patents

Fuel injection valve Download PDF

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Publication number
EP0682179B1
EP0682179B1 EP95105421A EP95105421A EP0682179B1 EP 0682179 B1 EP0682179 B1 EP 0682179B1 EP 95105421 A EP95105421 A EP 95105421A EP 95105421 A EP95105421 A EP 95105421A EP 0682179 B1 EP0682179 B1 EP 0682179B1
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EP
European Patent Office
Prior art keywords
insert
injection valve
fuel injection
main body
fuel
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
EP95105421A
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German (de)
French (fr)
Other versions
EP0682179A1 (en
Inventor
Waldemar Dipl.-Ing. Hans
Christian Preussner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Filing date
Publication date
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Publication of EP0682179A1 publication Critical patent/EP0682179A1/en
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Publication of EP0682179B1 publication Critical patent/EP0682179B1/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
    • 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
    • F02M51/0675—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 valve body having cylindrical guiding or metering portions, e.g. with fuel passages
    • F02M51/0678—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 valve body having cylindrical guiding or metering portions, e.g. with fuel passages all portions having fuel passages, e.g. flats, grooves, diameter reductions
    • 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
    • F02M69/04—Injectors peculiar thereto
    • F02M69/047—Injectors peculiar thereto injectors with air chambers, e.g. communicating with atmosphere for aerating the nozzles
    • 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
    • F02M69/08—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel characterised by the fuel being carried by compressed air into main stream of combustion-air

Definitions

  • the invention is based on a fuel injector according to the genus of the main claim. It's already a Electromagnetically actuated valve for the injection of a Fuel-gas mixture in a mixture-compression-ignition Internal combustion engine known from US Pat. No. 4,957,241, where between a nozzle body and a protective cap a spacer plate to influence the air volume is installed is.
  • the spacer plate between the nozzle body and Protective cap has a central opening in which the immersed downstream pin end of a valve needle.
  • the Air supply to the exiting from a fuel channel Fuel is directed through air channels and air chambers.
  • the radial air supply is used to tap the valve needle determined and done by the height of spacer knobs around the entire fuel jet. Ultimately it will but by the size of that extending in the axial direction Annular gap between the pin of the valve needle and the amount of opening in the spacer plate and the composition of the fuel-air mixture.
  • Injection valves (US Pat. No. 4,982,716) are also known, where an adapter is provided at the downstream end is formed in the air supply channels. Downstream A single spray opening is a baffle in the adapter provided on which the hosed fuel jet hits and is directed in a film into two spray channels, being on the fuel films formed after the impact targeted air is directed from the air supply ducts.
  • the functions of air supply and metering and the Attachment to the injector released together, so that a Optimally both functions hardly possible due to the integration is.
  • the fuel injector according to the invention with the characteristic Features of the main claim has the advantage that very simple and inexpensive very good atomization of fuel achieved through a targeted gas supply becomes. This is due to an inexpensive attachment body possible, which can be easily mounted on the fuel injector and is removable. It also results from the Multi-part structural design of the front body a large variety of variants that influence the Gas throughput and the direction of the fuel very much allows quick and easy.
  • the insert is mainly for gas supply and metering responsible.
  • a beam splitter can advantageously be provided, which is a double jet of the fuel injector maintained or strengthened.
  • the insert part has at least one guide shoulder that is in an axial Engages slot of the base body.
  • a large variety of variants it is very easy to achieve that only the insert parts for various specific applications be replaced while the body is multiple is usable. So there is a modular system. A Disassembly of the front body from the fuel injector is easy at all times due to the easy to handle attachment possible.
  • a ring spring For attaching the attachment body to the fuel injector it is advantageous to use a ring spring that a radial tension on the base body of the attachment body exercises so that this also due to an additional locking connection on the fuel injector even with strong ones Vibrations cannot slip.
  • the ring spring must may not be completely circular, but can be more open Spring washer be formed.
  • FIG. 1 shows a partially shown Fuel injector
  • Figure 2 is a plan view on an insert part according to the invention
  • Figure 3 is a bottom view to an insert part according to the invention.
  • a valve is shown in FIG. 1 as an exemplary embodiment in the form of a fuel injector for fuel injection systems of mixture compressing spark-ignited Internal combustion engines partially shown. Together with one the fuel injector is used according to the invention for the injection of a fuel-gas mixture into an intake pipe or directly into the combustion chamber of the Internal combustion engine.
  • the one that can be actuated electromagnetically, for example Fuel injector 1 extends concentrically along a longitudinal valve axis 2.
  • the fuel injector 1 has one at the downstream end extending nozzle body 5.
  • a stepped longitudinal bore 7 is formed in the nozzle body 5, which runs concentrically to the valve longitudinal axis 2 and in the one z.
  • B. arranged needle-shaped valve closing part 10 is.
  • the valve closing part 10 has, for example, two Guide sections 11, 12, together with a guide area 13 of the wall of the longitudinal bore 7 of the nozzle body 5 serve to guide the valve closing part 10.
  • the Longitudinal bore 7 of the nozzle body 5 has at its downstream End up in the direction of fuel flow frustoconical tapered fixed valve seat 15 with one frustoconical in the direction of fuel flow tapered sealing section 17 of the valve closing part 10 together forms a seat valve.
  • Valve closing part 10 connected to a tubular armature 20, the one with the armature 20 partially in the axial direction surrounding magnetic coil 22 and an armature 20 in the fixed valve seat 15 opposite direction tubular core 23 of the fuel injector 1 cooperates.
  • Valve closing part 10 is a return spring 25 with its one end, which strives to close the valve closure member 10 in To move towards the fixed valve seat 15. With your the other end, the return spring 25 is supported on one e.g. B. non-magnetic adjusting sleeve 27.
  • a spray orifice plate 32 On an end face 30 of the nozzle body facing away from the core 23 5 of the fuel injection valve 1 is a spray orifice plate 32 which, for example, by means of Laser welding produced weld seam firmly with the nozzle body 5 is connected.
  • the spray plate 32 has, for example four spray orifices 33 through which the at lifted valve closing part 10 flowing past the valve seat 15 Fuel is sprayed.
  • armature 20 z. B. on the scope of a valve jacket also belonging to the valve housing 35 of the fuel injector 1 has a recess 37 formed in which an upper sealing ring 38 is arranged is the sealing of a stepped bobbin 39, which engages around the magnetic coil 22, with respect to the fuel serves.
  • a second sealing ring 40 provides one in the circumference of the nozzle body 5 introduced groove 42 for sealing between the nozzle body 5 and the valve jacket 35.
  • a Sealing element 44 on the circumference of the valve jacket 35 serves for sealing between the circumference of the injector and one Valve holder, not shown.
  • an attachment body 50 For supplying and metering a gas that the improved Processing and atomization of the fuel is at the downstream end an attachment body 50 made of plastic intended.
  • the Use of recirculated exhaust gas enables a reduction the pollutant emission of the internal combustion engine.
  • the feeder of the gas up to the attachment body 50 is not closer shown.
  • the attachment body 50 is formed in three parts, one at least partially tubular base body 51 the downstream End of the nozzle body 5 radially surrounds and for example is attached to this by snapping.
  • the basic body 51 also extends downstream in the axial direction the spray plate 32.
  • a in the base body 51st insert 52 can be used immediately when installed arranged downstream of the spray plate 32.
  • the insert 52 is designed so that a gas from outside of the front body 50 coming into the interior of the front body 50 between insert 52 and base body 51 can flow in.
  • a complete and secure fixation of the Attachment body 50 on the nozzle body 5 of the fuel injector 1 is ensured by an annular spring 55 which with its radial spring force, part of the base body 51 presses against the nozzle body 5.
  • the ring spring 55 can, for. B. a not completely closed spring washer.
  • the base body 51 of the front body 50 sits down again of an upstream support section 57 and a downstream beam splitting section 58 together.
  • Carrier section 57 is used to fasten the attachment body 50 on the nozzle body 5 since it is the downstream end of the nozzle body 5 radially surrounds, and the gas supply from outside of the front body 50 in the direction of the insert 52.
  • Im tubular support section 57 is on its outer contour a circumferential groove 60 is provided, for example most of the axial extent of the support section 57 is formed and receive the ring spring 55 can.
  • the carrier section 57 has outside the groove 60 a largely constant outer diameter, being at its upper end 61 chamfers 62 can be introduced to the To simplify assembly of the attachment body 50.
  • the beam splitting section 58 has three annular areas different outside diameter, which are concentric run to the valve longitudinal axis 2 and follow one another axially.
  • Two radially to the same extent over the support section 57 protruding ring areas 64 serve an annular groove 65 form in which a sealing ring 66 for sealing between the scope of the injection valve and one not shown Valve holder, for example the intake line of the Internal combustion engine, can be used.
  • the ring groove 65 is axially through the two ring regions 64 and radially through delimits a groove bottom 68 which has a smaller diameter than the outside diameter of the support portion 57, but is, for example, the same size as the diameter of the Inner wall of the tubular support section 57.
  • the entire base body 51 is on the fuel injector 1, especially on the nozzle body 5 by snapping one formed circumferentially in the carrier section 57, of the Inner wall extending radially in the direction of the longitudinal axis 2 of the valve and a low height bead 70 in a circumferential groove 72 attached to the nozzle body 5.
  • This Locking connection prevents the base body from slipping 51, especially with strong vibrations, not yet completely. In addition, there is no security against rotation by snapping into place guaranteed.
  • the annular spring arranged in the groove 60 of the carrier section 57 55 is therefore used.
  • the carrier section 57 In order to make the carrier section 57 sufficiently flexible, is in the carrier section 57 at least one axially over the entire Length of the carrier section 57, that is, from the upper end 61 to the upper of the two ring areas 64, extending Slot 74 provided.
  • This at least one slot 74 in Carrier section 57 enables the carrier section to be spread apart 57 when mounting on the nozzle body 5 and ensures thus for simplified handling. For example, are conceivable also two opposite in the carrier section 57 slots made 74.
  • the at least one slot 74 serves as an opening in the carrier section 57 the supply of gas towards the insert 52.
  • the base body 51 is in its beam splitting section 58 with two diagonally to the valve longitudinal axis 2, in bores 75 diverging downstream, over which the fuel-gas mixture is sprayed becomes.
  • the one remaining between the two holes 75 Material inevitably acts as a beam splitter 76. Since the Bores 75 starting from a lying in the insert 52 Hosing chamber 77 immediately downstream of the orifice plate 32 run, the beam splitter 76 has one Pointed cutting edge 78, which is directed toward the spray perforated disk 32 is, while starting from the cutting edge 78, the beam splitter 76 wider in cross-section in the downstream direction becomes.
  • the double spray already through the spray openings 33 of the spray plate 32 generated and for example for injecting fuel in the direction of two intake valves is needed, but through the intermediary Gas supply can be affected by the Beam splitter 76 and the two bores 75 thus obtained or is reinforced.
  • the insert 52 is received in a designated extending in the axial region of the upper ring region 64 and centrally arranged trough 80 of the base body 51.
  • a trough bottom 81 which is the trough 80 downstream limited, is formed, for example, where the spray chamber 77 ends inside the insert 52 Bores 75 begin and the cutting edge 78 lies. Furthermore it is possible to form the bores 75 so that the Cutting edge 78 of the beam splitter 76 protrudes into the spray chamber 77, is further upstream than the trough bottom 81, so that by one on one of the trough 80 of the base body 51 facing end face 83 arranged gas supply channel 84 inflowing gas reaches exactly in a bore 75.
  • the insert 52 is designed so that it with his outer contour, at least with that of the spray orifice plate 32 facing away from end 83, which is directly in the trough 80 is set, fits in the recess 80.
  • Next to the Trough bottom 81 has trough 80 radially outside the bores 75 differently beveled surfaces on, through which reaches a defined installation position of the insert 52 and ensures gas supply in two areas, for example becomes.
  • the insert part 52 are namely in its lower, from the Splash plate 32 facing away from the lower part Front 83 for example with two gas supply channels 84 e.g. trapezoidal cross-section introduced on the front, the open to the beam splitting section 58 of the base body 51 are, but in the installed state of the insert 52 of the tapered surfaces of the trough 80 are also limited.
  • the completely surrounded gas supply channels 84 thus represent Inflow spaces for the gas. That through the inflow spaces in gas entering the spray chamber 77 is affected by the configuration the gas supply channels 84 largely perpendicular to the fuel sprayed out of the spray openings 33.
  • the slope of the largely frustoconical Wall of the spray chamber 77 is, for example, identical with those of the divergent holes 75.
  • the at least one Guide lug 85 engages radially in the assembled state at least one axial slot 74 of the carrier section 57 on so that the installation position is precisely defined and slipping of the insert part 52 relative to the base body 51 can be excluded by the anti-rotation device.
  • the at least one guide extension 85 extends radially Direction beyond at least one annular region 86.
  • the annular area 86 exerts a spring action, because it is surrounded by a circulating and groove-shaped recess 89 axially to a small extent is mobile.
  • FIG. 2 shows a top view of the insert 52 It becomes clear how, for example, the two leadership approaches 85 which in the slots 74 of the support portion 57 engage radially over the one having an axial spring action Area 86 protrude. Depending on the width of the Slots 74 are also the guide lugs 85 with a corresponding Width trained.
  • the gas supply channels 84 are in the center of the guide lugs 85 arranged so that the gas below the Guide approaches 85 flows through the slots 74 and then gets directly into the gas supply channels 84.
  • the flow cross section for the gas in the inflow spaces tapers from outer circumference to the spray chamber 77 so that the gas is strong is accelerated and that emerging from the spray openings 33 and fuel 52 flowing axially through the insert, that the gas hits largely vertically, especially is atomized finely.
  • the gas supply channels can 84 perpendicular to the valve longitudinal axis 2 or inclined in the direction of flow of the fuel.

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Brennstoffeinspritzventil nach der Gattung des Hauptanspruchs. Es ist schon ein elektromagnetisch betätigbares Ventil zur Einspritzung eines Brennstoff-Gas-Gemisches in eine gemischverdichtende fremdgezündete Brennkraftmaschine aus der US-PS 4 957 241 bekannt, bei dem zwischen einem Düsenkörper und einer Schutzkappe eine Abstandsplatte zur Luftmengenbeeinflussung eingebaut ist. Die Abstandsplatte zwischen Düsenkörper und Schutzkappe besitzt eine zentrale Öffnung, in die das stromabwärtige Zapfenende einer Ventilnadel eintaucht. Die Luftzufuhr zu dem aus einem Brennstoffkanal austretenden Brennstoff erfolgt ungezielt über Luftkanäle und Luftkammern. Dabei wird die radiale Luftzufuhr zum Zapfen der Ventilnadel durch die Höhe von Abstandsnoppen bestimmt und erfolgt um den gesamten Brennstoffstrahl herum. Letztlich wird aber durch die Größe des sich in axialer Richtung erstreckenden Ringspaltes zwischen dem Zapfen der Ventilnadel und dem Umfang der Öffnung in der Abstandsplatte die Menge und die Zusammensetzung des Brennstoff-Luft-Gemisches festgelegt. The invention is based on a fuel injector according to the genus of the main claim. It's already a Electromagnetically actuated valve for the injection of a Fuel-gas mixture in a mixture-compression-ignition Internal combustion engine known from US Pat. No. 4,957,241, where between a nozzle body and a protective cap a spacer plate to influence the air volume is installed is. The spacer plate between the nozzle body and Protective cap has a central opening in which the immersed downstream pin end of a valve needle. The Air supply to the exiting from a fuel channel Fuel is directed through air channels and air chambers. The radial air supply is used to tap the valve needle determined and done by the height of spacer knobs around the entire fuel jet. Ultimately it will but by the size of that extending in the axial direction Annular gap between the pin of the valve needle and the amount of opening in the spacer plate and the composition of the fuel-air mixture.

Bekannt sind ebenfalls Einspritzventile (US-PS 4 982 716), bei denen am stromabwärtigen Ende ein Adapter vorgesehen ist, in dem Luftzuführkanäle ausgebildet sind. Stromabwärts einer einzigen Abspritzöffnung ist im Adapter eine Prallfläche vorgesehen, auf die der abgespritzte Brennstoffstrahl trifft und filmförmig in zwei Abspritzkanäle geleitet wird, wobei auf die nach dem Aufprall gebildeten Brennstoffilme gezielt Luft aus den Luftzuführkanälen gerichtet ist. Dabei werden die Funktionen Luftzuführung bzw. -zumessung und die Befestigung am Einspritzventil zusammen gelöst, so daß ein Optimum beider Funktionen aufgrund der Integration kaum möglich ist.Injection valves (US Pat. No. 4,982,716) are also known, where an adapter is provided at the downstream end is formed in the air supply channels. Downstream A single spray opening is a baffle in the adapter provided on which the hosed fuel jet hits and is directed in a film into two spray channels, being on the fuel films formed after the impact targeted air is directed from the air supply ducts. Here the functions of air supply and metering and the Attachment to the injector released together, so that a Optimally both functions hardly possible due to the integration is.

Außerdem ist auch aus der DE-OS 41 08 279 bereits bekannt, einen Vorsatzkörper stromabwärts eines Ventilsitzes anzuordnen. Der aus einer Düse säulenförmig austretende Brennstoff gelangt unmittelbar in ein Zerstäubungsloch des Vorsatzkörpers, wo er von aus in den Seitenwänden eingebrachten Unterstützungsluftkanälen ausströmender Luft ummantelt und aufbereitet wird.In addition, it is already known from DE-OS 41 08 279 to arrange an attachment body downstream of a valve seat. The fuel emerging from a nozzle in the form of a column gets directly into an atomizing hole of the attachment body, where it from from supporting air channels introduced in the side walls escaping air jacketed and processed becomes.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Brennstoffeinspritzventil mit den kennzeichnenden Merkmalen des Hauptanspruchs hat den Vorteil, daß sehr einfach und kostengünstig eine sehr gute Zerstäubung von Brennstoff durch eine gezielte Gaszufuhr erreicht wird. Dies ist durch einen kostengünstigen Vorsatzkörper möglich, der sehr einfach am Brennstoffeinspritzventil montierbar und demontierbar ist. Außerdem ergibt sich durch die mehrteilige konstruktive Ausgestaltung des Vorsatzkörpers eine große Variantenvielfalt, die eine Beeinflussung des Gasdurchsatzes und der Strahlrichtung des Brennstoffs sehr schnell und einfach zuläßt. The fuel injector according to the invention with the characteristic Features of the main claim has the advantage that very simple and inexpensive very good atomization of fuel achieved through a targeted gas supply becomes. This is due to an inexpensive attachment body possible, which can be easily mounted on the fuel injector and is removable. It also results from the Multi-part structural design of the front body a large variety of variants that influence the Gas throughput and the direction of the fuel very much allows quick and easy.

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

Besonders vorteilhaft ist es, den Vorsatzkörper dreiteilig, nämlich aus einem rohrförmigen Grundkörper, einem in den Grundkörper einsetzbaren Einsatzteil und einer Ringfeder auszubilden. Während der Grundkörper der Abdichtung des Brennstoffeinspritzventils zu einer Ansaugleitung und der Befestigung des Vorsatzkörpers am Brennstoffeinspritzventil dient, ist das Einsatzteil hauptsächlich für die Gaszuführung und -zumessung verantwortlich. Im Grundkörper kann zudem in vorteilhafter Weise ein Strahlteiler vorgesehen sein, der eine Zweistrahligkeit des Brennstoffeinspritzventils aufrechterhält bzw. verstärkt.It is particularly advantageous to have three parts, namely from a tubular base body, one in the Insert insert and a ring spring to train. During the basic body of the sealing of the Fuel injector to an intake line and the Attachment of the attachment body to the fuel injector serves, the insert is mainly for gas supply and metering responsible. In the base body can also a beam splitter can advantageously be provided, which is a double jet of the fuel injector maintained or strengthened.

Um eine eindeutige Einbaulage des Einsatzteils im Grundkörper zu gewährleisten, ist es günstig, wenn das Einsatzteil wenigstens einen Führungsansatz besitzt, der in einen axialen Schlitz des Grundkörpers eingreift. Eine große Variantenvielfalt läßt sich insofern sehr einfach erreichen, daß für verschiedene konkrete Anwendungsfälle nur die Einsatzteile ausgetauscht werden, während der Grundkörper mehrfach verwendbar ist. Es liegt also ein Baukastensystem vor. Eine Demontage des Vorsatzkörpers vom Brennstoffeinspritzventil ist aufgrund der gut handhabbaren Befestigung jederzeit einfach möglich.To ensure a clear installation position of the insert in the base body To ensure it is convenient if the insert part has at least one guide shoulder that is in an axial Engages slot of the base body. A large variety of variants it is very easy to achieve that only the insert parts for various specific applications be replaced while the body is multiple is usable. So there is a modular system. A Disassembly of the front body from the fuel injector is easy at all times due to the easy to handle attachment possible.

Zur Befestigung des Vorsatzkörpers am Brennstoffeinspritzventil ist es vorteilhaft, eine Ringfeder zu verwenden, die eine radiale Spannung auf den Grundkörper des Vorsatzkörpers ausübt, so daß dieser auch aufgrund einer zusätzlichen Rastverbindung am Brennstoffeinspritzventil sogar bei starken Erschütterungen nicht verrutschen kann. Die Ringfeder muß dabei nicht vollständig umlaufend sein, sondern kann als offener Federring ausgebildet sein.For attaching the attachment body to the fuel injector it is advantageous to use a ring spring that a radial tension on the base body of the attachment body exercises so that this also due to an additional locking connection on the fuel injector even with strong ones Vibrations cannot slip. The ring spring must may not be completely circular, but can be more open Spring washer be formed.

Durch den Einsatz "maßgeschneiderter" Kunststoffe für die verschiedenen Bauteile ergeben sich weitere Vorteile. Dabei können entsprechend unterschiedlicher Einsatzzwecke verschiedene Kunststoffe für den Grundkörper und das Einsatzteil vorgesehen sein.By using "tailor-made" plastics for the Different components result in further advantages. Here can be different according to different purposes Plastics for the base body and the insert be provided.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 ein teilweise dargestelltes Brennstoffeinspritzventil, Figur 2 eine Draufsicht auf ein erfindungsgemäßes Einsatzteil und Figur 3 eine Unteransicht auf ein erfindungsgemäßes Einsatzteil.An embodiment of the invention is in the drawing shown in simplified form and in the description below explained in more detail. 1 shows a partially shown Fuel injector, Figure 2 is a plan view on an insert part according to the invention and Figure 3 is a bottom view to an insert part according to the invention.

Beschreibung des AusführungsbeispielsDescription of the embodiment

In der Figur 1 ist als ein Ausführungsbeispiel ein Ventil in der Form eines Brennstoffeinspritzventils für Brennstoffeinspritzanlagen von gemischverdichtenden fremdgezündeten Brennkraftmaschinen teilweise dargestellt. Zusammen mit einem erfindungsgemäßen Vorsatzkörper dient das Brennstoffeinspritzventil zur Einspritzung eines Brennstoff-Gas-Gemisches in ein Ansaugrohr oder unmittelbar in den Brennraum der Brennkraftmaschine. Das beispielsweise elektromagnetisch betätigbare Brennstoffeinspritzventil 1 erstreckt sich konzentrisch entlang einer Ventillängsachse 2. Als Teil eines Ventilgehäuses weist das Brennstoffeinspritzventil 1 einen sich am stromabwärtigen Ende erstreckenden Düsenkörper 5 auf. In dem Düsenkörper 5 ist eine gestufte Längsbohrung 7 ausgebildet, die konzentrisch zu der Ventillängsachse 2 verläuft und in der ein z. B. nadelförmiges Ventilschließteil 10 angeordnet ist. Das Ventilschließteil 10 weist beispielsweise zwei Führungsabschnitte 11, 12 auf, die zusammen mit einem Führungsbereich 13 der Wandung der Längsbohrung 7 des Düsenkörpers 5 der Führung des Ventilschließteils 10 dienen. Die Längsbohrung 7 des Düsenkörpers 5 besitzt an ihrem stromabwärtigen Ende einen sich in Richtung der Brennstoffströmung kegelstumpfförmig verjüngenden festen Ventilsitz 15, der mit einem sich in Brennstoffströmungsrichtung kegelstumpfförmig verjüngenden Dichtabschnitt 17 des Ventilschließteils 10 zusammen ein Sitzventil bildet.A valve is shown in FIG. 1 as an exemplary embodiment in the form of a fuel injector for fuel injection systems of mixture compressing spark-ignited Internal combustion engines partially shown. Together with one the fuel injector is used according to the invention for the injection of a fuel-gas mixture into an intake pipe or directly into the combustion chamber of the Internal combustion engine. The one that can be actuated electromagnetically, for example Fuel injector 1 extends concentrically along a longitudinal valve axis 2. As part of a valve housing the fuel injector 1 has one at the downstream end extending nozzle body 5. In a stepped longitudinal bore 7 is formed in the nozzle body 5, which runs concentrically to the valve longitudinal axis 2 and in the one z. B. arranged needle-shaped valve closing part 10 is. The valve closing part 10 has, for example, two Guide sections 11, 12, together with a guide area 13 of the wall of the longitudinal bore 7 of the nozzle body 5 serve to guide the valve closing part 10. The Longitudinal bore 7 of the nozzle body 5 has at its downstream End up in the direction of fuel flow frustoconical tapered fixed valve seat 15 with one frustoconical in the direction of fuel flow tapered sealing section 17 of the valve closing part 10 together forms a seat valve.

An seinem dem Dichtabschnitt 17 abgewandten Ende ist das Ventilschließteil 10 mit einem rohrförmigen Anker 20 verbunden, der mit einer den Anker 20 in axialer Richtung teilweise umgebenden Magnetspule 22 und einem dem Anker 20 in dem festen Ventilsitz 15 abgewandter Richtung gegenüberliegenden rohrförmigen Kern 23 des Brennstoffeinspritzventils 1 zusammenwirkt. An dem mit dem Anker 20 verbundenen Ende des Ventilschließteils 10 liegt eine Rückstellfeder 25 mit ihrem einen Ende an, die bestrebt ist, das Ventilschließteil 10 in Richtung des festen Ventilsitzes 15 zu bewegen. Mit ihrem anderen Ende stützt sich die Rückstellfeder 25 an einer z. B. nichtmagnetischen Einstellhülse 27 ab.At its end facing away from the sealing section 17, this is Valve closing part 10 connected to a tubular armature 20, the one with the armature 20 partially in the axial direction surrounding magnetic coil 22 and an armature 20 in the fixed valve seat 15 opposite direction tubular core 23 of the fuel injector 1 cooperates. At the end connected to the anchor 20 Valve closing part 10 is a return spring 25 with its one end, which strives to close the valve closure member 10 in To move towards the fixed valve seat 15. With your the other end, the return spring 25 is supported on one e.g. B. non-magnetic adjusting sleeve 27.

An einer dem Kern 23 abgewandten Stirnseite 30 des Düsenkörpers 5 des Brennstoffeinspritzventils 1 liegt eine Spritzlochscheibe 32 an, die beispielsweise durch eine mittels Laserschweißen hergestellte Schweißnaht fest mit dem Düsenkörper 5 verbunden ist. Die Spritzlochscheibe 32 weist beispielsweise vier Abspritzöffnungen 33 auf, durch die der bei abgehobenem Ventilschließteil 10 an dem Ventilsitz 15 vorbeiströmende Brennstoff abgespritzt wird.On an end face 30 of the nozzle body facing away from the core 23 5 of the fuel injection valve 1 is a spray orifice plate 32 which, for example, by means of Laser welding produced weld seam firmly with the nozzle body 5 is connected. The spray plate 32 has, for example four spray orifices 33 through which the at lifted valve closing part 10 flowing past the valve seat 15 Fuel is sprayed.

Im axialen Erstreckungsbereich des Ankers 20 ist z. B. an dem Umfang eines ebenfalls zum Ventilgehäuse gehörenden Ventilmantels 35 des Brennstoffeinspritzventils 1 eine Ausnehmung 37 ausgebildet, in der ein oberer Dichtring 38 angeordnet ist, der der Abdichtung eines gestuften Spulenkörpers 39, der die Magnetspule 22 umgreift, gegenüber dem Brennstoff dient. Ein zweiter Dichtring 40 sorgt in einer am Umfang des Düsenkörpers 5 eingebrachten Nut 42 für die Abdichtung zwischen dem Düsenkörper 5 und dem Ventilmantel 35. Ein Dichtelement 44 am Umfang des Ventilmantels 35 dient dem Abdichten zwischen dem Umfang des Einspritzventils und einer nicht dargestellten Ventilaufnahme.In the axial extent of the armature 20 z. B. on the scope of a valve jacket also belonging to the valve housing 35 of the fuel injector 1 has a recess 37 formed in which an upper sealing ring 38 is arranged is the sealing of a stepped bobbin 39, which engages around the magnetic coil 22, with respect to the fuel serves. A second sealing ring 40 provides one in the circumference of the nozzle body 5 introduced groove 42 for sealing between the nozzle body 5 and the valve jacket 35. A Sealing element 44 on the circumference of the valve jacket 35 serves for sealing between the circumference of the injector and one Valve holder, not shown.

Zur Zuführung und Zumessung eines Gases, das der verbesserten Aufbereitung und Zerstäubung des Brennstoffes dient, ist am stromabwärtigen Ende ein Vorsatzkörper 50 aus Kunststoff vorgesehen. Als Gas kann z. B. die durch einen Bypass vor einer Drosselklappe in einem Saugrohr der Brennkraftmaschine abgezweigte Saugluft, durch ein Zusatzgebläse geförderte Luft, aber auch rückgeführtes Abgas der Brennkraftmaschine oder eine Mischung von Luft und Abgas verwendet werden. Die Verwendung rückgeführten Abgases ermöglicht eine Reduzierung der Schadstoffemission der Brennkraftmaschine. Die Zuführung des Gases bis hin zu dem Vorsatzkörper 50 ist nicht näher dargestellt.For supplying and metering a gas that the improved Processing and atomization of the fuel is at the downstream end an attachment body 50 made of plastic intended. As a gas z. B. by a bypass a throttle valve in an intake manifold of the internal combustion engine branched suction air, conveyed by an additional fan Air, but also recirculated exhaust gas from the internal combustion engine or a mixture of air and exhaust gas can be used. The Use of recirculated exhaust gas enables a reduction the pollutant emission of the internal combustion engine. The feeder of the gas up to the attachment body 50 is not closer shown.

Der Vorsatzkörper 50 ist dreiteilig ausgebildet, wobei ein zumindest teilweise rohrförmiger Grundkörper 51 das stromabwärtige Ende des Düsenkörpers 5 radial umgibt und beispielsweise durch Einrasten an diesem befestigt ist. Der Grundkörper 51 erstreckt sich in axialer Richtung auch noch stromabwärts der Spritzlochscheibe 32. Ein in den Grundkörper 51 einsetzbares Einsatzteil 52 ist im eingebauten Zustand unmittelbar stromabwärts der Spritzlochscheibe 32 angeordnet. Das Einsatzteil 52 ist so ausgebildet, daß ein Gas von außerhalb des Vorsatzkörpers 50 kommend in das Innere des Vorsatzkörpers 50 zwischen Einsatzteil 52 und Grundkörper 51 einströmen kann. Eine vollständige und sichere Fixierung des Vorsatzkörpers 50 am Düsenkörper 5 des Brennstoffeinspritzventils 1 wird durch eine Ringfeder 55 gewährleistet, die mit ihrer radialen Federkraft einen Teil des Grundkörpers 51 gegen den Düsenkörper 5 drückt. Die Ringfeder 55 kann z. B. ein nicht vollständig geschlossener Federring sein.The attachment body 50 is formed in three parts, one at least partially tubular base body 51 the downstream End of the nozzle body 5 radially surrounds and for example is attached to this by snapping. The basic body 51 also extends downstream in the axial direction the spray plate 32. A in the base body 51st insert 52 can be used immediately when installed arranged downstream of the spray plate 32. The insert 52 is designed so that a gas from outside of the front body 50 coming into the interior of the front body 50 between insert 52 and base body 51 can flow in. A complete and secure fixation of the Attachment body 50 on the nozzle body 5 of the fuel injector 1 is ensured by an annular spring 55 which with its radial spring force, part of the base body 51 presses against the nozzle body 5. The ring spring 55 can, for. B. a not completely closed spring washer.

Der Grundkörper 51 des Vorsatzkörpers 50 setzt sich wiederum aus einem stromaufwärtigen Trägerabschnitt 57 und einem stromabwärtigen Strahlteilungsabschnitt 58 zusammen. Der Trägerabschnitt 57 dient dem Befestigen des Vorsatzkörpers 50 am Düsenkörper 5, da er das stromabwärtige Ende des Düsenkörpers 5 radial umgibt, und der Gaszufuhr von außerhalb des Vorsatzkörpers 50 in Richtung des Einsatzteils 52. Im rohrförmigen Trägerabschnitt 57 ist an dessen äußerer Kontur eine umlaufende Nut 60 vorgesehen, die beispielsweise über den größten Teil der axialen Erstreckung des Trägerabschnitts 57 ausgebildet ist und die Ringfeder 55 aufnehmen kann. Außerhalb der Nut 60 besitzt der Trägerabschnitt 57 einen weitgehend konstanten Außendurchmesser, wobei an seinem oberen Ende 61 Fasen 62 eingebracht sein können, um die Montage des Vorsatzkörpers 50 zu vereinfachen. Der Strahlteilungsabschnitt 58 weist dagegen drei ringförmige Bereiche unterschiedlichen Außendurchmessers auf, die konzentrisch zur Ventillängsachse 2 verlaufen und axial aufeinander folgen. Zwei radial in gleichem Maße über den Trägerabschnitt 57 hinausstehende Ringbereiche 64 dienen dazu, eine Ringnut 65 zu bilden, in die ein Dichtring 66 zum Abdichten zwischen dem Umfang des Einspritzventils und einer nicht dargestellten Ventilaufnahme, beispielsweise der Ansaugleitung der Brennkraftmaschine, eingesetzt werden kann. Die Ringnut 65 wird axial durch die zwei Ringbereiche 64 und radial durch einen Nutgrund 68 begrenzt, der einen kleineren Durchmesser als den Außendurchmesser des Trägerabschnitts 57 besitzt, aber beispielsweise genauso groß ist wie der Durchmesser der Innenwandung des rohrförmigen Trägerabschnitts 57.The base body 51 of the front body 50 sits down again of an upstream support section 57 and a downstream beam splitting section 58 together. Of the Carrier section 57 is used to fasten the attachment body 50 on the nozzle body 5 since it is the downstream end of the nozzle body 5 radially surrounds, and the gas supply from outside of the front body 50 in the direction of the insert 52. Im tubular support section 57 is on its outer contour a circumferential groove 60 is provided, for example most of the axial extent of the support section 57 is formed and receive the ring spring 55 can. The carrier section 57 has outside the groove 60 a largely constant outer diameter, being at its upper end 61 chamfers 62 can be introduced to the To simplify assembly of the attachment body 50. The beam splitting section 58, on the other hand, has three annular areas different outside diameter, which are concentric run to the valve longitudinal axis 2 and follow one another axially. Two radially to the same extent over the support section 57 protruding ring areas 64 serve an annular groove 65 form in which a sealing ring 66 for sealing between the scope of the injection valve and one not shown Valve holder, for example the intake line of the Internal combustion engine, can be used. The ring groove 65 is axially through the two ring regions 64 and radially through delimits a groove bottom 68 which has a smaller diameter than the outside diameter of the support portion 57, but is, for example, the same size as the diameter of the Inner wall of the tubular support section 57.

Der gesamte Grundkörper 51 wird an dem Brennstoffeinspritzventil 1, speziell an dem Düsenkörper 5 durch Einrasten einer im Trägerabschnitt 57 umlaufend ausgebildeten, von der Innenwandung sich radial in Richtung Ventillängsachse 2 erstreckenden und eine geringe Höhe aufweisenden Wulst 70 in einer umlaufenden Nut 72 am Düsenkörper 5 befestigt. Diese Rastverbindung sichert gegen ein Verrutschen des Grundkörpers 51, besonders bei starken Erschütterungen, noch nicht vollständig ab. Außerdem wird durch das Einrasten keine Verdrehsicherheit gewährleistet. Zur vollständigen sicheren Fixierung des Grundkörpers 51 am Düsenkörper 5 dient deshalb die in der Nut 60 des Trägerabschnitts 57 angeordnete Ringfeder 55.The entire base body 51 is on the fuel injector 1, especially on the nozzle body 5 by snapping one formed circumferentially in the carrier section 57, of the Inner wall extending radially in the direction of the longitudinal axis 2 of the valve and a low height bead 70 in a circumferential groove 72 attached to the nozzle body 5. This Locking connection prevents the base body from slipping 51, especially with strong vibrations, not yet completely. In addition, there is no security against rotation by snapping into place guaranteed. For complete secure Fixing the base body 51 on the nozzle body 5 is therefore used the annular spring arranged in the groove 60 of the carrier section 57 55.

Um den Trägerabschnitt 57 ausreichend flexibel zu gestalten, ist im Trägerabschnitt 57 wenigstens ein axial über die gesamte Länge des Trägerabschnittes 57, also vom oberen Ende 61 bis zum oberen der beiden Ringbereiche 64, verlaufender Schlitz 74 vorgesehen. Dieser wenigstens eine Schlitz 74 im Trägerabschnitt 57 ermöglicht ein Aufspreizen des Trägerabschnittes 57 bei der Montage auf dem Düsenkörper 5 und sorgt somit für eine vereinfachte Handhabung. Denkbar sind beispielsweise auch zwei im Trägerabschnitt 57 gegenüberliegend eingebrachte Schlitze 74. Neben der Verbesserung der Montage dient der wenigstens eine Schlitz 74 als Öffnung im Trägerabschnitt 57 der Zufuhr des Gases in Richtung des Einsatzteils 52.In order to make the carrier section 57 sufficiently flexible, is in the carrier section 57 at least one axially over the entire Length of the carrier section 57, that is, from the upper end 61 to the upper of the two ring areas 64, extending Slot 74 provided. This at least one slot 74 in Carrier section 57 enables the carrier section to be spread apart 57 when mounting on the nozzle body 5 and ensures thus for simplified handling. For example, are conceivable also two opposite in the carrier section 57 slots made 74. In addition to improving the assembly the at least one slot 74 serves as an opening in the carrier section 57 the supply of gas towards the insert 52.

In seinem Strahlteilungsabschnitt 58 ist der Grundkörper 51 mit zwei schräg zur Ventillängsachse 2 verlaufenden, in stromabwärtiger Richtung divergierenden Bohrungen 75 ausgebildet, über die das Brennstoff-Gas-Gemisch abgespritzt wird. Das zwischen den beiden Bohrungen 75 verbleibende Material wirkt zwangsläufig als ein Strahlteiler 76. Da die Bohrungen 75 ausgehend von einem im Einsatzteil 52 liegenden Abspritzraum 77 unmittelbar stromabwärts der Spritzlochscheibe 32 verlaufen, besitzt der Strahlteiler 76 eine spitze Schneide 78, die zur Spritzlochscheibe 32 hin gerichtet ist, während ausgehend von der Schneide 78 der Strahlteiler 76 in stromabwärtiger Richtung im Querschnitt breiter wird. Die Zweistrahligkeit, die bereits durch die Abspritzöffnungen 33 der Spritzlochscheibe 32 erzeugt und beispielsweise zum Einspritzen von Brennstoff in Richtung zweier Einlaßventile benötigt wird, aber durch die zwischengeschaltete Gaszufuhr beeinträchtigt werden kann, bleibt durch den Strahlteiler 76 und die beiden Bohrungen 75 also erhalten bzw. wird verstärkt.The base body 51 is in its beam splitting section 58 with two diagonally to the valve longitudinal axis 2, in bores 75 diverging downstream, over which the fuel-gas mixture is sprayed becomes. The one remaining between the two holes 75 Material inevitably acts as a beam splitter 76. Since the Bores 75 starting from a lying in the insert 52 Hosing chamber 77 immediately downstream of the orifice plate 32 run, the beam splitter 76 has one Pointed cutting edge 78, which is directed toward the spray perforated disk 32 is, while starting from the cutting edge 78, the beam splitter 76 wider in cross-section in the downstream direction becomes. The double spray already through the spray openings 33 of the spray plate 32 generated and for example for injecting fuel in the direction of two intake valves is needed, but through the intermediary Gas supply can be affected by the Beam splitter 76 and the two bores 75 thus obtained or is reinforced.

Das Einsatzteil 52 findet Aufnahme in einer dafür vorgesehenen, sich im axialen Bereich des oberen Ringbereichs 64 erstreckenden und zentral angeordneten Mulde 80 des Grundkörpers 51. Ein Muldenboden 81, der die Mulde 80 stromabwärts begrenzt, ist beispielsweise dort ausgeformt, wo der Abspritzraum 77 im Inneren des Einsatzteils 52 endet bzw. die Bohrungen 75 beginnen und die Schneide 78 liegt. Außerdem ist es möglich, die Bohrungen 75 so auszubilden, daß die Schneide 78 des Strahlteilers 76 in den Abspritzraum 77 hineinragt, also weiter stromaufwärts ist als der Muldenboden 81, so daß das durch einen an einer der Mulde 80 des Grundkörpers 51 zugewandten Stirnseite 83 angeordneten Gaszuführkanal 84 einströmende Gas genau in eine Bohrung 75 gelangt. Das Einsatzteil 52 ist so ausgestaltet, daß es mit seiner äußeren Kontur, zumindest mit der von der Spritzlochscheibe 32 abgewandten Stirnseite 83, die unmittelbar in die Mulde 80 gesetzt ist, maßgenau in die Mulde 80 paßt. Neben dem Muldenboden 81 weist die Mulde 80 radial außerhalb der Bohrungen 75 unterschiedlich angeschrägte Flächen auf, durch die eine definierte Einbaulage des Einsatzteils 52 erreicht und beispielsweise an zwei Bereichen die Gaszufuhr gewährleistet wird.The insert 52 is received in a designated extending in the axial region of the upper ring region 64 and centrally arranged trough 80 of the base body 51. A trough bottom 81 which is the trough 80 downstream limited, is formed, for example, where the spray chamber 77 ends inside the insert 52 Bores 75 begin and the cutting edge 78 lies. Furthermore it is possible to form the bores 75 so that the Cutting edge 78 of the beam splitter 76 protrudes into the spray chamber 77, is further upstream than the trough bottom 81, so that by one on one of the trough 80 of the base body 51 facing end face 83 arranged gas supply channel 84 inflowing gas reaches exactly in a bore 75. The insert 52 is designed so that it with his outer contour, at least with that of the spray orifice plate 32 facing away from end 83, which is directly in the trough 80 is set, fits in the recess 80. Next to the Trough bottom 81 has trough 80 radially outside the bores 75 differently beveled surfaces on, through which reaches a defined installation position of the insert 52 and ensures gas supply in two areas, for example becomes.

Im Einsatzteil 52 sind nämlich in seinem unteren, von der Spritzlochscheibe 32 abgewandten Teil an dessen unterer Stirnseite 83 beispielsweise zwei Gaszuführkanäle 84 mit z.B. trapezförmigem Querschnitt stirnseitig eingebracht, die zum Strahlteilungsabschnitt 58 des Grundkörpers 51 hin offen sind, jedoch im eingebauten Zustand des Einsatzteils 52 von den angeschrägten Flächen der Mulde 80 auch begrenzt werden. Die vollständig umgebenen Gaszuführkanäle 84 stellen also Zuströmräume für das Gas dar. Das durch die Zuströmräume in den Abspritzraum 77 eintretende Gas trifft durch die Ausgestaltung der Gaszuführkanäle 84 weitgehend senkrecht auf den aus den Abspritzöffnungen 33 abgespritzten Brennstoff. Der weitgehend kegelstumpfförmige innere Abspritzraum 77 ist derart ausgebildet, daß er nahe der Spritzlochscheibe 32 einen so großen, leicht elliptischen Querschnitt hat, daß der Brennstoff aus den Abspritzöffnungen 33 ungehindert eintreten kann und an seinem anderen Ende, also im Bereich des Muldenbodens 81, einen solchen Querschnitt besitzt, so daß ein stufenloser Übergang zu den Bohrungen 75 erfolgt und damit keine querschnittsverkleinernde Überdeckung der Bohrungen 75 vorliegt. Die Neigung der weitgehend kegelstumpfförmigen Wandung des Abspritzraumes 77 ist beispielsweise identisch mit denen der divergierenden Bohrungen 75.In the insert part 52 are namely in its lower, from the Splash plate 32 facing away from the lower part Front 83 for example with two gas supply channels 84 e.g. trapezoidal cross-section introduced on the front, the open to the beam splitting section 58 of the base body 51 are, but in the installed state of the insert 52 of the tapered surfaces of the trough 80 are also limited. The completely surrounded gas supply channels 84 thus represent Inflow spaces for the gas. That through the inflow spaces in gas entering the spray chamber 77 is affected by the configuration the gas supply channels 84 largely perpendicular to the fuel sprayed out of the spray openings 33. Of the is largely frustoconical inner spray chamber 77 formed such that he near the spray plate 32 has such a large, slightly elliptical cross section that the Fuel can freely enter the spray openings 33 can and at its other end, i.e. in the area of the Trough bottom 81, has such a cross section, so that a stepless transition to the holes 75 takes place and thus no cross-sectional covering of the holes 75 is present. The slope of the largely frustoconical Wall of the spray chamber 77 is, for example, identical with those of the divergent holes 75.

Von dem inneren Abspritzraum 77 erstrecken sich radial nach außen unmittelbar stromabwärts der Spritzlochscheibe 32 z. B. ein oder zwei Führungsansätze 85, die dem lagerichtigen Einbau des Einsatzteils 52 dienen. Der wenigstens eine Führungsansatz 85 greift in montiertem Zustand radial in den wenigstens einen axialen Schlitz 74 des Trägerabschnitts 57 ein, so daß die Einbaulage genau definiert ist und ein Verrutschen des Einsatzteils 52 gegenüber dem Grundkörper 51 durch die Verdrehsicherung ausgeschlossen werden kann. Der wenigstens eine Führungsansatz 85 erstreckt sich in radialer Richtung über wenigstens einen ringförmigen Bereich 86 hinaus. Der ringförmige Bereich 86 übt eine Federwirkung aus, da er durch einen unmittelbar stromabwärts liegenden, umlaufenden und nutförmigen Einstich 89 axial in geringem Maße beweglich ist. Geringe axiale Toleranzen können somit einfach ausgeglichen werden. Im eingebauten Zustand liegt das Einsatzteil 52 mit seiner oberen Stirnfläche, also auch mit dem Bereich 86 und teilweise mit dem wenigstens einen Führungsansatz 85 federnd an der Spritzlochscheibe 32 an. Nach der Montage des Vorsatzkörpers 50 am Brennstoffeinspritzventil 1 liegt eine genau definierte Zumeßgeometrie vor. Aufgrund der sehr einfachen Montage und auch Demontage des Vorsatzkörpers 50 lassen sich z. B. durch Verwendung unterschiedlicher Einsatzteile 52 einfach und kostengünstig Gasdurchsatz und Strahlrichtung des Brennstoffs beeinflussen.Extend radially from the inner spray chamber 77 outside immediately downstream of the orifice plate 32 e.g. B. one or two guide lugs 85 that the correct position Installation of the insert 52 serve. The at least one Guide lug 85 engages radially in the assembled state at least one axial slot 74 of the carrier section 57 on so that the installation position is precisely defined and slipping of the insert part 52 relative to the base body 51 can be excluded by the anti-rotation device. Of the at least one guide extension 85 extends radially Direction beyond at least one annular region 86. The annular area 86 exerts a spring action, because it is surrounded by a circulating and groove-shaped recess 89 axially to a small extent is mobile. Small axial tolerances can therefore be simple be balanced. This is in the installed state Insert part 52 with its upper end face, that is also with the area 86 and partially with the at least one guiding approach 85 resiliently on the spray orifice plate 32. After the assembly of the attachment body 50 on the fuel injector 1 there is a precisely defined metering geometry. Because of the very easy assembly and disassembly of the front body 50 can be z. B. by using different Insert parts 52 simple and inexpensive gas throughput and influence the jet direction of the fuel.

Die Figur 2 stellt eine Draufsicht auf das Einsatzteil 52 dar. Dabei wird deutlich, wie die beispielsweise zwei Führungsansätze 85, die in die Schlitze 74 des Trägerabschnittes 57 greifen, radial über den eine axiale Federwirkung besitzenden Bereich 86 hinausragen. Je nach Breite der Schlitze 74 sind auch die Führungsansätze 85 mit einer entsprechenden Breite ausgebildet.FIG. 2 shows a top view of the insert 52 It becomes clear how, for example, the two leadership approaches 85 which in the slots 74 of the support portion 57 engage radially over the one having an axial spring action Area 86 protrude. Depending on the width of the Slots 74 are also the guide lugs 85 with a corresponding Width trained.

In der Figur 3, die eine Unteransicht auf das Einsatzteil 52 zeigt, sind die beispielsweise zwei Gaszuführkanäle 84 näher erkennbar. Die Gaszuführkanäle 84 sind mittig zu den Führungsansätzen 85 angeordnet, so daß das Gas unterhalb der Führungsansätze 85 durch die Schlitze 74 einströmt und dann direkt in die Gaszuführkanäle 84 gelangt. Der Strömungsquerschnitt für das Gas in den Zuströmräumen verjüngt sich vom äußeren Umfang zum Abspritzraum 77 hin, so daß das Gas stark beschleunigt wird und der aus den Abspritzöffnungen 33 austretende und das Einsatzteil 52 axial durchströmende Brennstoff, auf den das Gas weitgehend senkrecht trifft, besonders fein zerstäubt wird. Dabei können die Gaszuführkanäle 84 senkrecht zur Ventil längsachse 2 oder geneigt in Strömungsrichtung des Brennstoffs verlaufen.3, which is a bottom view of the insert 52 shows, for example, two gas supply channels 84 are closer recognizable. The gas supply channels 84 are in the center of the guide lugs 85 arranged so that the gas below the Guide approaches 85 flows through the slots 74 and then gets directly into the gas supply channels 84. The flow cross section for the gas in the inflow spaces tapers from outer circumference to the spray chamber 77 so that the gas is strong is accelerated and that emerging from the spray openings 33 and fuel 52 flowing axially through the insert, that the gas hits largely vertically, especially is atomized finely. The gas supply channels can 84 perpendicular to the valve longitudinal axis 2 or inclined in the direction of flow of the fuel.

Claims (9)

  1. Fuel injection valve for injecting a fuel/gas mixture for fuel injection systems of internal combustion engines, having a valve longitudinal centre line (2), having a movable valve closing body (10), having a nozzle body (5) which has a valve seat (15) interacting with the valve closing body, having at least one spray opening (33) downstream of the valve seat, having an attachment (50) arranged at the downstream end of the injection valve, which attachment has at least one means for gas supply and a fuel/gas mixture emerging from it, the attachment being formed at least from an axially extending tubular main body (51) and an insert (52) which can be inserted in a depression (80) of the main body and the insert being arranged with an inner opening as spray space downstream of the at least one spray opening, characterized in that at least one gas supply passage (84) is arranged in an end surface (83), of the insert (52), facing towards the depression (80) of the main body (51), which gas supply passage (84) extends from the outer periphery of the insert (52) as far as the spray space (77) and is bounded by the main body (51).
  2. Fuel injection valve according to Claim 1, characterized in that both the main body (51) and the insert (52) are manufactured from a plastic.
  3. Fuel injection valve according to Claim 1, characterized in that a jet splitter (76) is arranged in the main body (51) downstream of the insert (52).
  4. Fuel injection valve according to Claim 1, characterized in that the main body (51), of the attachment (50), radially surrounding the nozzle body (5) is pressed at least partially against the nozzle body (5) by a ring spring (55).
  5. Fuel injection valve according to Claim 1, characterized in that the insert (52) can be placed as a form fit in the depression (80) of the main body (51).
  6. Fuel injection valve according to Claim 1, characterized in that the insert (52) has an axially sprung region (86) which is in contact with the downstream end of the injection valve.
  7. Fuel injection valve according to Claim 6, characterized in that at least one guide protrusion (85) is elevated radially from the axially sprung region (86) of the insert (52) and is used for the positional fixing of the insert (52) relative to the main body (51).
  8. Fuel injection valve according to Claim 1, characterized in that the at least one gas supply passage (84) for gas supply and metering is configured in such a way that it tapers, starting from the outer periphery, in the direction towards the valve longitudinal centre line (2).
  9. Fuel injection valve according to Claim 1, characterized in that the spray space (77) within the insert (52) is elliptical in cross-section and extends in the axial direction substantially in the shape of a truncated cone.
EP95105421A 1994-05-11 1995-04-11 Fuel injection valve Expired - Lifetime EP0682179B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4416610 1994-05-11
DE4416610A DE4416610A1 (en) 1994-05-11 1994-05-11 Fuel injector

Publications (2)

Publication Number Publication Date
EP0682179A1 EP0682179A1 (en) 1995-11-15
EP0682179B1 true EP0682179B1 (en) 1998-07-08

Family

ID=6517859

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Application Number Title Priority Date Filing Date
EP95105421A Expired - Lifetime EP0682179B1 (en) 1994-05-11 1995-04-11 Fuel injection valve

Country Status (5)

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US (1) US5655715A (en)
EP (1) EP0682179B1 (en)
JP (1) JPH0842429A (en)
DE (2) DE4416610A1 (en)
ES (1) ES2120096T3 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5772122A (en) * 1995-04-27 1998-06-30 Nippondenso Co., Ltd. Fuel injection apparatus for an internal combustion engine
US6371387B1 (en) 1997-03-13 2002-04-16 Siemens Automotive Corporation Air assist metering apparatus and method
DE19744739A1 (en) * 1997-10-10 1999-04-15 Bosch Gmbh Robert Fuel injection valve for internal combustion engine
GB9914642D0 (en) * 1999-06-24 1999-08-25 Lucas Ind Plc Fuel injector
US6302337B1 (en) 2000-08-24 2001-10-16 Synerject, Llc Sealing arrangement for air assist fuel injectors
US6484700B1 (en) 2000-08-24 2002-11-26 Synerject, Llc Air assist fuel injectors
US6402057B1 (en) 2000-08-24 2002-06-11 Synerject, Llc Air assist fuel injectors and method of assembling air assist fuel injectors
US7104477B2 (en) 2001-09-13 2006-09-12 Synerject, Llc Air assist fuel injector guide assembly
WO2004106722A2 (en) * 2003-05-27 2004-12-09 Avl List Gmbh Internal combustion engine
JP2008533347A (en) * 2005-02-04 2008-08-21 ムラード、エム．イズマイロフ Fuel injection system and fuel injector having improved spray generator
US8820665B2 (en) 2007-09-25 2014-09-02 S.C. Johnson & Son, Inc. Fluid dispensing nozzle

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3046890A1 (en) * 1980-12-12 1982-07-15 Robert Bosch Gmbh, 7000 Stuttgart ELECTROMAGNETICALLY ACTUABLE VALVE, ESPECIALLY FUEL INJECTION VALVE FOR FUEL INJECTION SYSTEMS
US4982716A (en) * 1988-02-19 1991-01-08 Toyota Jidosha Kabushiki Kaisha Fuel injection valve with an air assist adapter for an internal combustion engine
FR2635827B1 (en) * 1988-08-30 1993-11-26 Solex FUEL INJECTION DEVICE WITH AERATION CHAMBER
DE4103918B4 (en) * 1990-02-15 2005-05-04 Aisan Kogyo K.K., Obu Multi-hole injection nozzle device
US5241938A (en) * 1990-03-14 1993-09-07 Aisan Kogyo Kabushiki Kaisha Injector with assist air passage for atomizing fuel
JP2996525B2 (en) * 1991-03-20 2000-01-11 株式会社日立製作所 Fuel injection valve
DE4129834A1 (en) * 1991-09-07 1993-03-11 Bosch Gmbh Robert DEVICE FOR INJECTING A FUEL-GAS MIXTURE
US5174505A (en) * 1991-11-01 1992-12-29 Siemens Automotive L.P. Air assist atomizer for fuel injector

Also Published As

Publication number Publication date
JPH0842429A (en) 1996-02-13
US5655715A (en) 1997-08-12
ES2120096T3 (en) 1998-10-16
DE59502729D1 (en) 1998-08-13
DE4416610A1 (en) 1995-11-16
EP0682179A1 (en) 1995-11-15

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