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EP1108134B1 - Fuel injection valve - Google Patents

Fuel injection valve Download PDF

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Publication number
EP1108134B1
EP1108134B1 EP00909055A EP00909055A EP1108134B1 EP 1108134 B1 EP1108134 B1 EP 1108134B1 EP 00909055 A EP00909055 A EP 00909055A EP 00909055 A EP00909055 A EP 00909055A EP 1108134 B1 EP1108134 B1 EP 1108134B1
Authority
EP
European Patent Office
Prior art keywords
valve seat
seat body
fuel injection
valve
coating
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
EP00909055A
Other languages
German (de)
French (fr)
Other versions
EP1108134A1 (en
Inventor
Dieter Maier
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 EP1108134A1 publication Critical patent/EP1108134A1/en
Application granted granted Critical
Publication of EP1108134B1 publication Critical patent/EP1108134B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/188—Spherical or partly spherical shaped valve member ends
    • 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
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • 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
    • 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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49405—Valve or choke making
    • Y10T29/49412—Valve or choke making with assembly, disassembly or composite article making

Definitions

  • the invention is based on a fuel injection valve according to the preamble of independent claim 1 or according to the preamble of independent claim 7.
  • a fuel injector is already known from DE-OS 44 08 875 (see FIG. 1), which has a spherical valve closing body which interacts with a flat valve seat surface of a valve seat body.
  • a spray orifice plate is firmly connected by means of a weld seam.
  • This valve seat part consisting of an orifice plate and valve seat body, is tightly fastened in a valve seat support.
  • the fixed connection between the valve seat part and the valve seat support is carried out on a holding edge of the spray orifice plate, which is under radial tension, with a circumferential weld seam.
  • a fuel injector is already known from DE-PS 41 25 155, in which at least one spray hole is already provided in the valve seat body.
  • the cylindrical valve seat body is therefore not firmly connected to the valve seat support via a spray orifice plate, but directly on its outer circumference via a circumferential weld seam.
  • an electromagnetically actuated fuel injection valve which, among other things, has a non-magnetic thin-walled sleeve as a connecting part between a core and a valve seat body. With its two axial ends, the sleeve is firmly connected to the core and to the valve seat body, so that the sleeve serves as a valve seat support for the valve seat body.
  • the core and the valve seat body are designed with an outer diameter such that they extend into the sleeve at the two ends, so that the sleeve completely surrounds the two components core and valve seat body in these protruding areas.
  • the fixed connections of the sleeve to the core and the valve seat body are, for. B. achieved by pressing. There is a risk that the connection area will not remain completely hydraulically sealed after being pressed in or over the operating period of the injection valve.
  • the fuel injection valves according to the invention with the characterizing features of claim 1 and claim 7 have the advantage of a simple and inexpensive solution to achieve complete hydraulic tightness between a valve seat body and a valve seat body receiving the valve seat body.
  • the coating is applied to the outer surface of the easy-to-use valve seat body, the production of the coating is simple and reliable. Simple quality monitoring of the coatings to be applied is also possible.
  • FIG. 1 shows a known fuel injector, shown partially
  • FIG. 2 shows two exemplary embodiments of a valve seat body to be fastened in a valve seat carrier
  • FIG. 3 shows another exemplary embodiment of a valve seat body to be fastened in a valve seat carrier.
  • FIG. 1 partially shows an already known valve in the form of an injection valve for fuel injection systems of mixed-compression spark-ignition internal combustion engines.
  • the injection valve has a tubular valve seat support 1, in which a longitudinal opening 3 is formed concentrically with a valve longitudinal axis 2.
  • a longitudinal opening 3 is formed concentrically with a valve longitudinal axis 2.
  • tubular valve needle 5 arranged at its downstream end 6 with a spherical Valve closing body 7, on the circumference of which, for example, five flats 8 are provided, is connected.
  • the injection valve is actuated in a known manner, for example electromagnetically.
  • piezoelectric or magnetostrictive actuators are also conceivable as excitation elements.
  • An indicated electromagnetic circuit with a magnet coil 10, an armature 11 and a core 12 is used for the axial movement of the valve needle 5 and thus for opening against the spring force of a return spring (not shown) or closing the injection valve.
  • the armature 11 is facing away from the valve closing body 7 End of the valve needle 5 by z.
  • B. a weld seam connected by a laser and aligned with the core 12.
  • the magnet coil 10 surrounds the core 12, which represents the end of an inlet connector (not shown in more detail) which is enclosed by the magnet coil 10 and which serves to supply the fuel to be metered by means of the valve.
  • a guide opening 15 of a valve seat body 16 is used to guide the valve closing body 7 during the axial movement.
  • the cylindrical valve seat body 16 is tightly mounted by welding in the longitudinal end 3 of the valve seat carrier 1, which end faces away from the core 11, and extends concentrically to the longitudinal axis 2 of the valve.
  • the circumference of the valve seat body 16 has a slightly smaller diameter than the longitudinal opening 3 of the valve seat carrier 1.
  • On its one lower end face 17, which faces away from the valve closing body 7, the valve seat body 16 is concentrically and firmly connected to a base part 20 of, for example, a cup-shaped spray nozzle disk 21.
  • valve seat body 16 and spray plate 21 are made by a circumferential and sealed, for. B. by means of a laser-formed first weld seam 22.
  • This type of assembly avoids the risk of undesired deformation of the base part 20 in its central region 24, in which there are at least one, for example four, spray openings 25 formed by eroding or punching.
  • the base part 20 of the cup-shaped spray perforated disk 21 is adjoined by a circumferential retaining edge 26, which extends in the axial direction away from the valve seat body 16 and is conically bent outwards up to its end 27.
  • the holding edge 26 exerts a radial spring action on the wall of the longitudinal opening 3. This prevents chip formation at the valve seat part and at the longitudinal opening 3 when the valve seat part consisting of valve seat body 16 and spray orifice plate 21 is inserted into the longitudinal opening 3 of the valve seat carrier 1.
  • the insertion depth of the valve seat part consisting of valve seat body 16 and cup-shaped spray orifice plate 21 into the longitudinal opening 3 determines the size of the stroke of the valve needle 5, since the one end position of the valve needle 5 when the solenoid coil 10 is not energized due to the valve closing body 7 resting on a valve seat surface 29 of the valve seat body 16 is set.
  • the other end position of the valve needle 5 is determined when the solenoid 10 is excited, for example by the armature 11 resting on the core 12. The way between these two end positions of the valve needle 5 thus represent the stroke.
  • the spherical valve closing body 7 interacts with the valve seat surface 29 of the valve seat body 16 which tapers in the shape of a truncated cone in the direction of flow and is formed in the axial direction between the guide opening 15 and the lower end face 17 of the valve seat body 16.
  • the diameter of the guide opening 15 is designed such that the spherical valve closing body 7 projects through the guide opening 15 outside of its flattened portions 8 with a small radial distance.
  • FIGS. 2 and 3 show several exemplary embodiments of valve seat bodies 16 to be fastened in a valve seat carrier 1.
  • the valve seat carrier 1 and valve seat body 16 shown in FIGS. 2 and 3 are designed in a slightly different manner from the components shown in FIG. 1 in order to make various embodiments clear.
  • the valve seat support 1 according to FIGS. 2 and 3 is sleeve-shaped with the longitudinal opening 3. Such a thin-walled valve seat support 1 can, for example, be at least partially surrounded by a plastic coating, not shown.
  • the valve seat support 1 has been formed, for example, by deep drawing, the material being a non-magnetic material, e.g. a rust-proof CrNi steel is used. Another difference from the valve seat support 1 shown in FIG.
  • valve seat support 1 of FIGS. 2 and 3 comprises a jacket section 39 and a bottom section 40, the bottom section 40 forming the downstream end of the valve seat support 1.
  • the longitudinal opening 3 of the valve seat carrier 1 continues in the bottom section 40 as an outlet opening 41.
  • the valve seat body 16 shown in FIGS. 2 and 3 is characterized in that it has a recess 43 downstream of the valve seat surface 29, into which e.g. a spray plate 21 can be used.
  • a spray plate 21 e.g., spray perforated disks 21 made of sheet metal, silicon or with a metallic, galvanically produced multilayer structure, etc. be used.
  • the valve seat body 16 With its lower end face 17, the valve seat body 16 bears against the bottom section 40 of the valve seat carrier 1 in an edge region surrounding the outlet opening 41.
  • valve seat body 16 So far, it has been known to provide a weld seam between valve seat body 16 and valve seat support 1 in order to achieve hydraulic tightness.
  • the assembly of these two components 1, 16 is simplified by coating a lateral surface 44 of the cylindrical valve seat body 16 in whole or in part, so that a weld seam can be dispensed with.
  • the valve seat body 16 is usually made of a Cr steel. According to the invention, a thin coating 45 is applied to the lateral surface 44 of the valve seat body 16 before it is installed in the valve seat carrier 1. The coating 45 is with a applied in such a thickness that a press connection is created in the pairing of valve seat body 16 / valve seat support 1. When the valve seat body 16 is pressed into the valve seat support 1, the relatively soft coating material deforms plastically in the connection area of the two components and in this way ensures a secure hydraulically sealed connection without additional connection measures, such as the application of a weld seam.
  • Suitable coating materials are, for example, metals, such as copper, tin or nickel, or plastics, such as PTFE, which is known under the registered name Teflon®. The coating is carried out either by galvanic deposition, by spraying technology or by vulcanization.
  • the coating 45 is applied to the outer lateral surface 44 of the easy-to-handle valve seat body 16, the production of the coating 45 is simple and reliable. Simple quality monitoring of the coatings 45 to be applied is also possible.
  • FIG. 2 Two exemplary embodiments of coatings 45 are indicated schematically in FIG. 2, the coating thickness not being given to scale.
  • the coating 45 can only be carried out in an axial partial area of the lateral surface 44; the right side, on the other hand, shows a coating 45 which extends over the entire axial extent of the lateral surface 44 of the valve seat body 16.
  • Figure 3 illustrates an embodiment in which a circumferential groove 48 is provided on the lateral surface 44, which is slightly recessed to the remaining lateral surface 44. This groove 48 is with a coating 45 made of metal or plastic. Ultimately, this is again a partially coated lateral surface 44.
  • the coating 45 can also be achieved by applying an adhesive.
  • a fuel-resistant, microencapsulated adhesive is used.
  • Such an adhesive can e.g. be a liquid capillary gap adhesive.
  • the encapsulation of the adhesive is broken up and the adhesive released can harden in the connection area.
  • a subsequent hydraulic sealing weld 30 and / or fixation for axial securing is no longer necessary.
  • the adhesive is applied, for example, only in an axial partial area of the lateral surface 44 of the valve seat body 16, as it is e.g. is already indicated on the left in FIG. 2 for the coating 45.

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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)

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Brennstoffeinspritzventil nach der Gattung des unabhängigen Anspruchs 1 bzw. nach der Gattung des unabhängigen Anspruchs 7.The invention is based on a fuel injection valve according to the preamble of independent claim 1 or according to the preamble of independent claim 7.

Aus der DE-OS 44 08 875 (siehe Figur 1) ist bereits ein Brennstoffeinspritzventil bekannt, das einen kugelförmigen Ventilschließkörper aufweist, der mit einer ebenen Ventilsitzfläche eines Ventilsitzkörpers zusammenwirkt. An dem Ventilsitzkörper ist an dessen stromabwärtiger Stirnseite eine Spritzlochscheibe mittels einer Schweißnaht fest verbunden. Dieses aus Spritzlochscheibe und Ventilsitzkörper bestehende Ventilsitzteil ist in einem Ventilsitzträger dicht befestigt. Die feste Verbindung zwischen dem Ventilsitzteil und dem Ventilsitzträger erfolgt an einem Halterand der Spritzlochscheibe, der unter radialer Spannung steht, mit einer umlaufenden Schweißnaht.A fuel injector is already known from DE-OS 44 08 875 (see FIG. 1), which has a spherical valve closing body which interacts with a flat valve seat surface of a valve seat body. On the downstream side of the valve seat body, a spray orifice plate is firmly connected by means of a weld seam. This valve seat part, consisting of an orifice plate and valve seat body, is tightly fastened in a valve seat support. The fixed connection between the valve seat part and the valve seat support is carried out on a holding edge of the spray orifice plate, which is under radial tension, with a circumferential weld seam.

Außerdem ist schon aus der DE-PS 41 25 155 ein Brennstoffeinspritzventil bekannt, bei dem wenigstens ein Spritzloch bereits im Ventilsitzkörper vorgesehen ist. Der zylinderförmige Ventilsitzkörper ist deshalb nicht über eine Spritzlochscheibe mit dem Ventilsitzträger fest verbunden, sondern unmittelbar an seinem äußeren Umfang über eine umlaufende Schweißnaht.In addition, a fuel injector is already known from DE-PS 41 25 155, in which at least one spray hole is already provided in the valve seat body. The cylindrical valve seat body is therefore not firmly connected to the valve seat support via a spray orifice plate, but directly on its outer circumference via a circumferential weld seam.

Aus der US-PS 4,946,107 ist bereits ein elektromagnetisch betätigbares Brennstoffeinspritzventil bekannt, das unter anderem eine unmagnetische dünnwandige Hülse als Verbindungsteil zwischen einem Kern und einem Ventilsitzkörper aufweist. Mit ihren beiden axialen Enden ist die Hülse fest mit dem Kern und mit dem Ventilsitzkörper verbunden, so dass die Hülse für den Ventilsitzkörper als Ventilsitzträger dient. Der Kern und der Ventilsitzkörper sind mit einem solchen Außendurchmesser ausgebildet, dass sie in die Hülse an den beiden Enden hineinreichen, so dass die Hülse die beiden Bauteile Kern und Ventilsitzkörper in diesen hineinragenden Bereichen vollständig umgibt. Die festen Verbindungen der Hülse mit dem Kern und dem Ventilsitzkörper werden z. B. mittels Einpressen erzielt. Dabei besteht die Gefahr, dass der Verbindungsbereich nach dem Einpressen bzw. über die Betriebsdauer des Einspritzventils nicht vollständig hydraulisch dicht bleibt.From US Pat. No. 4,946,107, an electromagnetically actuated fuel injection valve is already known, which, among other things, has a non-magnetic thin-walled sleeve as a connecting part between a core and a valve seat body. With its two axial ends, the sleeve is firmly connected to the core and to the valve seat body, so that the sleeve serves as a valve seat support for the valve seat body. The core and the valve seat body are designed with an outer diameter such that they extend into the sleeve at the two ends, so that the sleeve completely surrounds the two components core and valve seat body in these protruding areas. The fixed connections of the sleeve to the core and the valve seat body are, for. B. achieved by pressing. There is a risk that the connection area will not remain completely hydraulically sealed after being pressed in or over the operating period of the injection valve.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäßen Brennstoffeinspritzventile mit den kennzeichnenden Merkmalen des Anspruchs 1 bzw. des Anspruchs 7 haben den Vorteil einer einfachen und kostengünstigen Lösung zur Erzielung einer vollständigen hydraulischen Dichtheit zwischen einem Ventilsitzkörper und einem den Ventilsitzkörper aufnehmenden Ventilsitzträger.The fuel injection valves according to the invention with the characterizing features of claim 1 and claim 7 have the advantage of a simple and inexpensive solution to achieve complete hydraulic tightness between a valve seat body and a valve seat body receiving the valve seat body.

Besonders vorteilhaft ist es dabei, dass auf einen Wärmeeintrag benötigende Fügeverfahren, wie Laserschweißen, verzichtet werden kann, die in nachteiliger Weise die hochgenauen Formtoleranzen im Dichtbereich verschlechtern können.It is particularly advantageous in this case that there is no need for joining processes which require the introduction of heat, such as laser welding, which can disadvantageously impair the high-precision shape tolerances in the sealing area.

Da die Beschichtung an der äußeren Mantelfläche des einfach zu handhabenden Ventilsitzkörpers aufgebracht wird, ist die Herstellung der Beschichtung einfach und prozesssicher. Außerdem ist eine einfache Qualitätsüberwachung der aufzubringenden Beschichtungen möglich.Since the coating is applied to the outer surface of the easy-to-use valve seat body, the production of the coating is simple and reliable. Simple quality monitoring of the coatings to be applied is also possible.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen der im Anspruch 1 bzw. im Anspruch 7 angegebenen Brennstoffeinspritzventile möglich.The measures listed in the subclaims enable advantageous developments and improvements of the fuel injection valves specified in claim 1 and claim 7, respectively.

Zeichnungdrawing

Ausführungsbeispiele der Erfindung sind in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 ein teilweise dargestelltes bekanntes Brennstoffeinspritzventil, Figur 2 zwei Ausführungsbeispiele eines in einem Ventilsitzträger zu befestigenden Ventilsitzkörpers und Figur 3 ein weiteres Ausführungsbeispiel eines in einem Ventilsitzträger zu befestigenden Ventilsitzkörpers.Embodiments of the invention are shown in simplified form in the drawing and explained in more detail in the following description. FIG. 1 shows a known fuel injector, shown partially, FIG. 2 shows two exemplary embodiments of a valve seat body to be fastened in a valve seat carrier, and FIG. 3 shows another exemplary embodiment of a valve seat body to be fastened in a valve seat carrier.

Beschreibung der AusführungsbeispieleDescription of the embodiments

In der Figur 1 ist ein bereits bekanntes Ventil in der Form eines Einspritzventils für Brennstoffeinspritzanlagen von gemischverdichtenden fremdgezündeten Brennkraftmaschinen teilweise dargestellt. Das Einspritzventil hat einen rohrförmigen Ventilsitzträger 1, in dem konzentrisch zu einer Ventillängsachse 2 eine Längsöffnung 3 ausgebildet ist. In der Längsöffnung 3 ist eine z. B. rohrförmige Ventilnadel 5 angeordnet, die an ihrem stromabwärtigen Ende 6 mit einem kugelförmigen Ventilschließkörper 7, an dessen Umfang beispielsweise fünf Abflachungen 8 vorgesehen sind, verbunden ist.FIG. 1 partially shows an already known valve in the form of an injection valve for fuel injection systems of mixed-compression spark-ignition internal combustion engines. The injection valve has a tubular valve seat support 1, in which a longitudinal opening 3 is formed concentrically with a valve longitudinal axis 2. In the longitudinal opening 3 is a z. B. tubular valve needle 5 arranged at its downstream end 6 with a spherical Valve closing body 7, on the circumference of which, for example, five flats 8 are provided, is connected.

Die Betätigung des Einspritzventils erfolgt in bekannter Weise beispielsweise elektromagnetisch. Ebenso sind jedoch auch piezoelektrische oder magnetostriktive Aktoren als Erregerelemente denkbar. Zur axialen Bewegung der Ventilnadel 5 und damit zum Öffnen entgegen der Federkraft einer nicht dargestellten Rückstellfeder bzw. Schließen des Einspritzventils dient ein angedeuteter elektromagnetischer Kreis mit einer Magnetspule 10, einem Anker 11 und einem Kern 12. Der Anker 11 ist mit dem dem Ventilschließkörper 7 abgewandten Ende der Ventilnadel 5 durch z. B. eine Schweißnaht mittels eines Lasers verbunden und auf den Kern 12 ausgerichtet. Die Magnetspule 10 umgibt den Kern 12, der das sich durch die Magnetspule 10 umschließende Ende eines nicht näher gezeigten Einlaßstutzens, der der Zufuhr des mittels des Ventils zuzumessenden Brennstoffs dient, darstellt.The injection valve is actuated in a known manner, for example electromagnetically. However, piezoelectric or magnetostrictive actuators are also conceivable as excitation elements. An indicated electromagnetic circuit with a magnet coil 10, an armature 11 and a core 12 is used for the axial movement of the valve needle 5 and thus for opening against the spring force of a return spring (not shown) or closing the injection valve. The armature 11 is facing away from the valve closing body 7 End of the valve needle 5 by z. B. a weld seam connected by a laser and aligned with the core 12. The magnet coil 10 surrounds the core 12, which represents the end of an inlet connector (not shown in more detail) which is enclosed by the magnet coil 10 and which serves to supply the fuel to be metered by means of the valve.

Zur Führung des Ventilschließkörpers 7 während der Axialbewegung dient eine Führungsöffnung 15 eines Ventilsitzkörpers 16. In das stromabwärts liegende, dem Kern 11 abgewandte Ende des Ventilsitzträgers 1 ist in der konzentrisch zur Ventillängsachse 2 verlaufenden Längsöffnung 3 der zylinderförmige Ventilsitzkörper 16 durch Schweißen dicht montiert. Der Umfang des Ventilsitzkörpers 16 weist einen geringfügig kleineren Durchmesser auf als die Längsöffnung 3 des Ventilsitzträgers 1. An seiner einen, dem Ventilschließkörper 7 abgewandten, unteren Stirnseite 17 ist der Ventilsitzkörper 16 mit einem Bodenteil 20 einer z.B. topfförmig ausgebildeten Spritzlochscheibe 21 konzentrisch und fest verbunden.A guide opening 15 of a valve seat body 16 is used to guide the valve closing body 7 during the axial movement. The cylindrical valve seat body 16 is tightly mounted by welding in the longitudinal end 3 of the valve seat carrier 1, which end faces away from the core 11, and extends concentrically to the longitudinal axis 2 of the valve. The circumference of the valve seat body 16 has a slightly smaller diameter than the longitudinal opening 3 of the valve seat carrier 1. On its one lower end face 17, which faces away from the valve closing body 7, the valve seat body 16 is concentrically and firmly connected to a base part 20 of, for example, a cup-shaped spray nozzle disk 21.

Die Verbindung von Ventilsitzkörper 16 und Spritzlochscheibe 21 erfolgt durch eine umlaufende und dichte, z. B. mittels eines Lasers ausgebildete erste Schweißnaht 22. Durch diese Art der Montage ist die Gefahr einer unerwünschten Verformung des Bodenteils 20 in seinem zentralen Bereich 24, in dem sich wenigstens eine, beispielsweise vier durch Erodieren oder Stanzen ausgeformte Abspritzöffnungen 25 befinden, vermieden.The connection of valve seat body 16 and spray plate 21 is made by a circumferential and sealed, for. B. by means of a laser-formed first weld seam 22. This type of assembly avoids the risk of undesired deformation of the base part 20 in its central region 24, in which there are at least one, for example four, spray openings 25 formed by eroding or punching.

An das Bodenteil 20 der topfförmigen Spritzlochscheibe 21 schließt sich ein umlaufender Halterand 26 an, der sich in axialer Richtung dem Ventilsitzkörper 16 abgewandt erstreckt und bis zu seinem Ende 27 hin konisch nach außen gebogen ist. Der Halterand 26 übt eine radiale Federwirkung auf die Wandung der Längsöffnung 3 aus. Dadurch wird beim Einschieben des aus Ventilsitzkörper 16 und Spritzlochscheibe 21 bestehenden Ventilsitzteils in die Längsöffnung 3 des Ventilsitzträgers 1 eine Spanbildung am Ventilsitzteil und an der Längsöffnung 3 vermieden. An seinem Ende 27 ist der Halterand 26 der Spritzlochscheibe 21 mit der Wandung der Längsöffnung 3 durch eine umlaufende und dichte zweite, z. B. mittels eines Lasers ausgebildete Schweißnaht 30 verbunden.The base part 20 of the cup-shaped spray perforated disk 21 is adjoined by a circumferential retaining edge 26, which extends in the axial direction away from the valve seat body 16 and is conically bent outwards up to its end 27. The holding edge 26 exerts a radial spring action on the wall of the longitudinal opening 3. This prevents chip formation at the valve seat part and at the longitudinal opening 3 when the valve seat part consisting of valve seat body 16 and spray orifice plate 21 is inserted into the longitudinal opening 3 of the valve seat carrier 1. At its end 27, the holding edge 26 of the spray plate 21 with the wall of the longitudinal opening 3 by a circumferential and sealed second, z. B. connected by a laser formed weld 30.

Die Einschubtiefe des aus Ventilsitzkörper 16 und topfförmiger Spritzlochscheibe 21 bestehenden Ventilsitzteils in die Längsöffnung 3 bestimmt die Größe des Hubs der Ventilnadel 5, da die eine Endstellung der Ventilnadel 5 bei nicht erregter Magnetspule 10 durch die Anlage des Ventilschließkörpers 7 an einer Ventilsitzfläche 29 des Ventilsitzkörpers 16 festgelegt ist. Die andere Endstellung der Ventilnadel 5 wird bei erregter Magnetspule 10 beispielsweise durch die Anlage des Ankers 11 an dem Kern 12 festgelegt. Der Weg zwischen diesen beiden Endstellungen der Ventilnadel 5 stellt somit den Hub dar.The insertion depth of the valve seat part consisting of valve seat body 16 and cup-shaped spray orifice plate 21 into the longitudinal opening 3 determines the size of the stroke of the valve needle 5, since the one end position of the valve needle 5 when the solenoid coil 10 is not energized due to the valve closing body 7 resting on a valve seat surface 29 of the valve seat body 16 is set. The other end position of the valve needle 5 is determined when the solenoid 10 is excited, for example by the armature 11 resting on the core 12. The way between these two end positions of the valve needle 5 thus represent the stroke.

Der kugelförmige Ventilschließkörper 7 wirkt mit der sich in Strömungsrichtung kegelstumpfförmig verjüngenden Ventilsitzfläche 29 des Ventilsitzkörpers 16 zusammen, die in axialer Richtung zwischen der Führungsöffnung 15 und der unteren Stirnseite 17 des Ventilsitzkörpers 16 ausgebildet ist.The spherical valve closing body 7 interacts with the valve seat surface 29 of the valve seat body 16 which tapers in the shape of a truncated cone in the direction of flow and is formed in the axial direction between the guide opening 15 and the lower end face 17 of the valve seat body 16.

Damit die Strömung des Mediums von einem Ventilinnenraum 35 kommend auch die Abspritzöffnungen 25 der Spritzlochscheibe 21 erreicht, sind am Umfang des kugelförmigen Ventilschließkörpers 7 fünf Abflachungen 8 eingebracht. Zur exakten Führung des Ventilschließkörpers 7 und damit der Ventilnadel 5 während der Axialbewegung ist der Durchmesser der Führungsöffnung 15 so ausgebildet, dass der kugelförmige Ventilschließkörper 7 außerhalb seiner Abflachungen 8 die Führungsöffnung 15 mit geringem radialem Abstand durchragt.So that the flow of the medium coming from a valve interior 35 also reaches the spray openings 25 of the spray plate 21, five flats 8 are introduced on the circumference of the spherical valve closing body 7. For exact guidance of the valve closing body 7 and thus the valve needle 5 during the axial movement, the diameter of the guide opening 15 is designed such that the spherical valve closing body 7 projects through the guide opening 15 outside of its flattened portions 8 with a small radial distance.

In den Figuren 2 und 3 sind mehrere Ausführungsbeispiele von in einem Ventilsitzträger 1 zu befestigenden Ventilsitzkörper 16 dargestellt. Die in den Figuren 2 und 3 gezeigten Ventilsitzträger 1 und Ventilsitzkörper 16 sind dabei in geringfügig abweichender Weise gegenüber den in Figur 1 dargestellten Bauteilen ausgeführt, um verschiedene Ausführungsformen deutlich zu machen. Der Ventilsitzträger 1 gemäß den Figuren 2 und 3 ist hülsenförmig mit der Längsöffnung 3 ausgebildet. Ein solcher dünnwandiger Ventilsitzträger 1 kann beispielsweise mit einer nicht dargestellten Kunststoffumspritzung wenigstens teilweise umgeben sein. Der Ventilsitzträger 1 ist beispielsweise durch Tiefziehen ausgebildet worden, wobei als Werkstoff ein nichtmagnetisches Material, z.B. ein rostbeständiger CrNi-Stahl verwendet ist. Ein weiterer Unterschied zu dem in Figur 1 dargestellten Ventilsitzträger 1 besteht darin, dass der Ventilsitzträger 1 der Figuren 2 und 3 einen Mantelabschnitt 39 und einen Bodenabschnitt 40 umfasst, wobei der Bodenabschnitt 40 das stromabwärtige Ende des Ventilsitzträgers 1 bildet. Die Längsöffnung 3 des Ventilsitzträgers 1 setzt sich im Bodenabschnitt 40 als Austrittsöffnung 41 fort.FIGS. 2 and 3 show several exemplary embodiments of valve seat bodies 16 to be fastened in a valve seat carrier 1. The valve seat carrier 1 and valve seat body 16 shown in FIGS. 2 and 3 are designed in a slightly different manner from the components shown in FIG. 1 in order to make various embodiments clear. The valve seat support 1 according to FIGS. 2 and 3 is sleeve-shaped with the longitudinal opening 3. Such a thin-walled valve seat support 1 can, for example, be at least partially surrounded by a plastic coating, not shown. The valve seat support 1 has been formed, for example, by deep drawing, the material being a non-magnetic material, e.g. a rust-proof CrNi steel is used. Another difference from the valve seat support 1 shown in FIG. 1 is that the valve seat support 1 of FIGS. 2 and 3 comprises a jacket section 39 and a bottom section 40, the bottom section 40 forming the downstream end of the valve seat support 1. The longitudinal opening 3 of the valve seat carrier 1 continues in the bottom section 40 as an outlet opening 41.

Der in den Figuren 2 und 3 gezeigte Ventilsitzkörper 16 zeichnet sich dadurch aus, dass er stromabwärts der Ventilsitzfläche 29 eine Ausnehmung 43 besitzt, in die z.B. eine Spritzlochscheibe 21 einsetzbar ist. Dabei können Spritzlochscheiben 21 aus Blech, Silizium oder mit einem metallischen, galvanisch erzeugten Multilayeraufbau u.a. verwendet werden. Mit seiner unteren Stirnseite 17 liegt der Ventilsitzkörper 16 in einem die Austrittsöffnung 41 umgebenden Randbereich an dem Bodenabschnitt 40 des Ventilsitzträgers 1 an.The valve seat body 16 shown in FIGS. 2 and 3 is characterized in that it has a recess 43 downstream of the valve seat surface 29, into which e.g. a spray plate 21 can be used. In this case, spray perforated disks 21 made of sheet metal, silicon or with a metallic, galvanically produced multilayer structure, etc. be used. With its lower end face 17, the valve seat body 16 bears against the bottom section 40 of the valve seat carrier 1 in an edge region surrounding the outlet opening 41.

Bisher ist es bekannt, zur Erzielung einer hydraulischen Dichtheit zwischen Ventilsitzkörper 16 und Ventilsitzträger 1 eine Schweißnaht anzubringen. Erfindungsgemäß wird die Montage dieser beiden Bauteile 1, 16 vereinfacht, indem eine Mantelfläche 44 des zylinderförmigen Ventilsitzkörpers 16 ganz oder teilweise beschichtet wird, so dass auf eine Schweißnaht verzichtet werden kann.So far, it has been known to provide a weld seam between valve seat body 16 and valve seat support 1 in order to achieve hydraulic tightness. According to the invention, the assembly of these two components 1, 16 is simplified by coating a lateral surface 44 of the cylindrical valve seat body 16 in whole or in part, so that a weld seam can be dispensed with.

Üblicherweise ist der Ventilsitzkörper 16 aus einem Cr-Stahl hergestellt. Auf die Mantelfläche 44 des Ventilsitzkörpers 16 wird vor dessen Montage im Ventilsitzträger 1 erfindungsgemäß eine dünne Beschichtung 45 aufgebracht. Die Beschichtung 45 wird dabei mit einer solchen Dicke gezielt aufgebracht, dass in der Paarung Ventilsitzkörper 16/Ventilsitzträger 1 eine Pressverbindung entsteht. Beim Einpressen des Ventilsitzkörpers 16 in den Ventilsitzträger 1 verformt sich das relativ weiche Beschichtungsmaterial im Verbindungsbereich der beiden Bauteile plastisch und sorgt auf diese Weise für eine sichere hydraulisch dichte Verbindung ohne zusätzliche Verbindungsmaßnahmen, wie das Anbringen einer Schweißnaht. Als Beschichtungsmaterialien kommen beispielsweise Metalle, wie Kupfer, Zinn oder Nickel, oder Kunststoffe, wie PTFE, das unter dem eingetragenen Namen Teflon® bekannt ist, in Frage. Die Beschichtung erfolgt dabei entweder durch galvanisches Abscheiden, durch Spritztechnik oder durch Aufvulkanisieren.The valve seat body 16 is usually made of a Cr steel. According to the invention, a thin coating 45 is applied to the lateral surface 44 of the valve seat body 16 before it is installed in the valve seat carrier 1. The coating 45 is with a applied in such a thickness that a press connection is created in the pairing of valve seat body 16 / valve seat support 1. When the valve seat body 16 is pressed into the valve seat support 1, the relatively soft coating material deforms plastically in the connection area of the two components and in this way ensures a secure hydraulically sealed connection without additional connection measures, such as the application of a weld seam. Suitable coating materials are, for example, metals, such as copper, tin or nickel, or plastics, such as PTFE, which is known under the registered name Teflon®. The coating is carried out either by galvanic deposition, by spraying technology or by vulcanization.

Da die Beschichtung 45 an der äußeren Mantelfläche 44 des einfach zu handhabenden Ventilsitzkörpers 16 aufgebracht wird, ist die Herstellung der Beschichtung 45 einfach und prozesssicher. Außerdem ist eine einfache Qualitätsüberwachung der aufzubringenden Beschichtungen 45 möglich.Since the coating 45 is applied to the outer lateral surface 44 of the easy-to-handle valve seat body 16, the production of the coating 45 is simple and reliable. Simple quality monitoring of the coatings 45 to be applied is also possible.

In Figur 2 sind zwei Ausführungsbeispiele von Beschichtungen 45 schematisch angedeutet, wobei die Beschichtungsdicke nicht maßstäblich angegeben ist. Auf der linken Seite wird dabei verdeutlicht, dass die Beschichtung 45 nur in einem axialen Teilbereich der Mantelfläche 44 vorgenommen werden kann; die rechte Seite zeigt dagegen eine Beschichtung 45, die über die gesamte axiale Erstreckung der Mantelfläche 44 des Ventilsitzkörpers 16 verläuft. Figur 3 veranschaulicht ein Ausführungsbeispiel, bei dem an der Mantelfläche 44 eine umlaufende Nut 48 vorgesehen ist, die geringfügig vertieft zur übrigen Mantelfläche 44 vorliegt. Diese Nut 48 ist mit einer Beschichtung 45 aus Metall oder Kunststoff ausführbar. Dabei handelt es sich letztlich wiederum um eine teilweise beschichtete Mantelfläche 44.Two exemplary embodiments of coatings 45 are indicated schematically in FIG. 2, the coating thickness not being given to scale. On the left-hand side it is made clear that the coating 45 can only be carried out in an axial partial area of the lateral surface 44; the right side, on the other hand, shows a coating 45 which extends over the entire axial extent of the lateral surface 44 of the valve seat body 16. Figure 3 illustrates an embodiment in which a circumferential groove 48 is provided on the lateral surface 44, which is slightly recessed to the remaining lateral surface 44. This groove 48 is with a coating 45 made of metal or plastic. Ultimately, this is again a partially coated lateral surface 44.

Die Beschichtung 45 kann außer den genannten Möglichkeiten auch durch das Aufbringen eines Klebstoffs erzielt werden. Idealerweise wird dafür ein brennstoffbeständiger, mikroverkapselter Klebstoff verwendet. Ein solcher Klebstoff kann z.B. ein flüssiger Kapillarspaltkleber sein. Beim Einpressen des beschichteten Ventilsitzkörpers 16 in den Ventilsitzträger 1 wird die Verkapselung des Klebstoffs aufgebrochen und der freiwerdende Klebstoff kann im Verbindungsbereich aushärten. Auf diese Weise entsteht eine feste und hydraulisch dichte Verbindung von Ventilsitzkörper 16 und Ventilsitzträger 1. Eine anschließende hydraulische Dichtschweißung 30 und/oder Fixierung zur axialen Sicherung ist nicht mehr notwendig. Der Klebstoff wird beispielsweise nur in einem axialen Teilbereich der Mantelfläche 44 des Ventilsitzkörpers 16 aufgebracht, wie es z.B. in Figur 2 auf der linken Seite bereits für die Beschichtung 45 angedeutet ist.In addition to the possibilities mentioned, the coating 45 can also be achieved by applying an adhesive. Ideally, a fuel-resistant, microencapsulated adhesive is used. Such an adhesive can e.g. be a liquid capillary gap adhesive. When the coated valve seat body 16 is pressed into the valve seat carrier 1, the encapsulation of the adhesive is broken up and the adhesive released can harden in the connection area. In this way, a firm and hydraulically sealed connection of valve seat body 16 and valve seat support 1 is created. A subsequent hydraulic sealing weld 30 and / or fixation for axial securing is no longer necessary. The adhesive is applied, for example, only in an axial partial area of the lateral surface 44 of the valve seat body 16, as it is e.g. is already indicated on the left in FIG. 2 for the coating 45.

Claims (10)

  1. Fuel injection valve for fuel injection systems of internal combustion engines, having a valve longitudinal axis, having a valve seat body which has a fixed valve seat, having a valve seat carrier which receives the valve seat body and is permanently connected to it, having a valve closing body which interacts with the valve seat of the valve seat body, characterized in that the valve seat body (16) has an outer surface (44) which is provided with a coating (45) composed of another material from the material of the valve seat body (16) and by means of which a hydraulically sealed connection can be brought about between the valve seat body (16) and the valve seat carrier (1).
  2. Fuel injection valve according to Claim 1, characterized in that the coating (45) is applied only in an axial part of the outer surface (44) of the valve seat body (16).
  3. Fuel injection valve according to Claim 1 or 2, characterized in that metals such as copper, tin or nickel, can be used as the coating material.
  4. Fuel injection valve according to Claim 1 or 2, characterized in that plastics, such as PTFE, can be used as the coating material.
  5. Fuel injection valve according to Claim 2, characterized in that the valve seat body (16) has, on its outer surface (44), a circumferential groove (48) which is filled with the coating (45).
  6. Fuel injection valve according to one of the preceding claims, characterized in that the coating (45) is applied in the circumferential direction, completely around the circumference.
  7. Fuel injection valve according to Claim 1, characterized in that the outer surface (44) of the valve seat body (16) is provided with an adhesive by means of which the hydraulically sealed connection between the valve seat body (16) and the valve seat carrier (1) can be brought about.
  8. Fuel injection valve according to Claim 7, characterized in that the adhesive is applied only in an axial part of the outer surface (44) of the valve seat body (16).
  9. Fuel injection valve according to Claim 7 or 8, characterized in that a micro-encapsulated adhesive can be used as the adhesive, the encapsulation of the adhesive not being broken until the valve seat body (16) is pressed into the valve seat carrier (1).
  10. Fuel injection valve according to one of Claims 7 to 9, characterized in that the adhesive is applied in the circumferential direction, completely around the circumference.
EP00909055A 1999-06-18 2000-02-22 Fuel injection valve Expired - Lifetime EP1108134B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19927898 1999-06-18
DE19927898A DE19927898A1 (en) 1999-06-18 1999-06-18 Fuel injection valve comprises a layer of material which is located on the outer surface of the valve body and ensures a hydraulically tight joint between the valve seat body and its carrier structure
PCT/DE2000/000494 WO2000079122A1 (en) 1999-06-18 2000-02-22 Fuel injection valve

Publications (2)

Publication Number Publication Date
EP1108134A1 EP1108134A1 (en) 2001-06-20
EP1108134B1 true EP1108134B1 (en) 2004-12-29

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EP00909055A Expired - Lifetime EP1108134B1 (en) 1999-06-18 2000-02-22 Fuel injection valve

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US (1) US6454188B1 (en)
EP (1) EP1108134B1 (en)
JP (1) JP2003502575A (en)
KR (1) KR100691204B1 (en)
CN (1) CN1133809C (en)
DE (2) DE19927898A1 (en)
WO (1) WO2000079122A1 (en)

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DE102007051585A1 (en) 2007-10-29 2009-04-30 Robert Bosch Gmbh Fuel injecting valve for internal-combustion engine of motor vehicle, has valve seat body fixed in housing, where radially abutted regions of body and housing are separated by intermediate layer made of elastically compressible material
DE102007051584A1 (en) 2007-10-29 2009-04-30 Robert Bosch Gmbh Fuel injection valve for fuel injection devices of internal combustion engines, has valve seat body that is axially braced against axial stop with additional spray hole washer by deformable plastic
DE102008040822A1 (en) 2008-07-29 2010-02-04 Robert Bosch Gmbh Injection valve for atomizing of e.g. urea water solution, in internal-combustion engine, has blowhole disk prefixed to valve seat body under leaving flow gap downstream to valve opening and designed as diaphragm
DE102008044242A1 (en) 2008-12-01 2010-06-02 Robert Bosch Gmbh Internal combustion engine
DE102008044243A1 (en) 2008-12-01 2010-06-02 Robert Bosch Gmbh Multi-cylinder internal-combustion engine for motor vehicle, has fuel injecting valves that are designed as multi-hole injecting valves with different fuel flows, where one of valves has less fuel flow in central installation position

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Publication number Priority date Publication date Assignee Title
DE102007051585A1 (en) 2007-10-29 2009-04-30 Robert Bosch Gmbh Fuel injecting valve for internal-combustion engine of motor vehicle, has valve seat body fixed in housing, where radially abutted regions of body and housing are separated by intermediate layer made of elastically compressible material
DE102007051584A1 (en) 2007-10-29 2009-04-30 Robert Bosch Gmbh Fuel injection valve for fuel injection devices of internal combustion engines, has valve seat body that is axially braced against axial stop with additional spray hole washer by deformable plastic
DE102008040822A1 (en) 2008-07-29 2010-02-04 Robert Bosch Gmbh Injection valve for atomizing of e.g. urea water solution, in internal-combustion engine, has blowhole disk prefixed to valve seat body under leaving flow gap downstream to valve opening and designed as diaphragm
DE102008044242A1 (en) 2008-12-01 2010-06-02 Robert Bosch Gmbh Internal combustion engine
DE102008044243A1 (en) 2008-12-01 2010-06-02 Robert Bosch Gmbh Multi-cylinder internal-combustion engine for motor vehicle, has fuel injecting valves that are designed as multi-hole injecting valves with different fuel flows, where one of valves has less fuel flow in central installation position

Also Published As

Publication number Publication date
KR20010072346A (en) 2001-07-31
EP1108134A1 (en) 2001-06-20
US6454188B1 (en) 2002-09-24
DE19927898A1 (en) 2000-12-21
WO2000079122A1 (en) 2000-12-28
CN1133809C (en) 2004-01-07
DE50009101D1 (en) 2005-02-03
KR100691204B1 (en) 2007-03-09
CN1313931A (en) 2001-09-19
JP2003502575A (en) 2003-01-21

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