EP2286081B1 - Hold-down member for a fuel injection device - Google Patents

Hold-down member for a fuel injection device Download PDF

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Publication number
EP2286081B1
EP2286081B1 EP09753724A EP09753724A EP2286081B1 EP 2286081 B1 EP2286081 B1 EP 2286081B1 EP 09753724 A EP09753724 A EP 09753724A EP 09753724 A EP09753724 A EP 09753724A EP 2286081 B1 EP2286081 B1 EP 2286081B1
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EP
European Patent Office
Prior art keywords
hold
down member
fuel injection
webs
injection valve
Prior art date
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Active
Application number
EP09753724A
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German (de)
French (fr)
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EP2286081A1 (en
Inventor
Thilo Bolz
Thomas Fuerst
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
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Publication of EP2286081A1 publication Critical patent/EP2286081A1/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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • F02M55/025—Common rails
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/004—Joints; Sealings
    • 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
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/85—Mounting of fuel injection apparatus
    • F02M2200/852—Mounting of fuel injection apparatus provisions for mounting the fuel injection apparatus in a certain orientation, e.g. markings or notches
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/85—Mounting of fuel injection apparatus
    • F02M2200/853—Mounting of fuel injection apparatus involving use of quick-acting mechanism, e.g. clips
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/85—Mounting of fuel injection apparatus
    • F02M2200/856—Mounting of fuel injection apparatus characterised by mounting injector to fuel or common rail, or vice versa

Definitions

  • the invention is based on a hold-down device for a fuel injection device according to the preamble of claim 1.
  • a fastening device for a fuel injection valve for attachment to a suction tube in which the axial fixation of the fuel injection valve on the fuel distributor line or on a plug-in nipple by a fastener, which is designed as a U-shaped securing clip provided with two resiliently resilient legs is.
  • the securing clip engages in the mounted state by corresponding recesses of the plug-in nipple and can be latched into a recess formed as an annular groove in a connecting piece of the fuel injection valve.
  • the axial clearance between the recesses and the securing clip as well as between the annular groove and the securing clip should be kept small in order to achieve an exact fixation of the fuel injection valve without tension of the seal.
  • a disadvantage of the DE 29 26 490 A1 known fastening device is in particular the bracing effect of the various mounting parts on the fuel injection valve.
  • the force flow generated in the fuel injection valve leads to deformations and thus to changes in the stroke of the valve needle to jamming and to a pressure or bending load of the housing parts, which are generally thin-walled and welded together at several points.
  • each fastening measure leads, for example by a support collar to increase the radial extent of the fuel injection valve and thus to an increased space requirement during installation.
  • the fastening device comprises a sleeve which is clamped between a shoulder of the fuel rail and a shoulder of the fuel injection valve and is formed of an elastic material. Due to its tubular structure, the sleeve can transfer the hold-down forces to the fuel injector only to a limited extent effectively.
  • the claimed by the shoulders of the fuel injection valve and fuel distributor surfaces of the sleeve serving as a holding down represent the production edges resulting from the production of the blank of the sleeve cutting edges.
  • the hold-down device according to the invention for a fuel injection device with the characterizing features of claim 1 has the advantage that it has a particularly simple design, is very simple and inexpensive to produce and still a very effective holddown of a fuel injector in a receiving bore of a cylinder head or an intake pipe is achieved.
  • conventional manufacturing processes such as stamping, eroding or laser cutting
  • blanks for the subsequent hold-down can be removed from sheets of spring steel or stainless steel and bent into numerous, quite complex desired shapes.
  • the inventive embodiment of the hold-down is characterized in particular by its compact design, so that the radially required space is extremely low, especially in the region of the passage of the connector of the fuel injection valve.
  • the fuel injector includes at least one fuel injector, a fuel injector containment bore, and a fuel rail manifold, the hold down being clamped between a shoulder of the fuel injector and an end surface of the port.
  • the hold-down device has a part-ring-shaped base element, from which an axially compliant hold-down bracket extends, which has at least two webs, two inclined sections and two contact sections.
  • the hold-down device in the circumferential direction with an open area in such a way that it is penetrated by the connection plug of the fuel injection valve, so that an unambiguous installation position is defined for the hold-down device.
  • a Verwarfix ist the blank holder relative to the connection piece is eliminated by the mating pin / recess on the fuel injector / nozzle.
  • the holding-down device is mounted on the fuel injection valve in such a way that a hold-down clip subjected to bending stress is directed away from the connection plug of the fuel injection valve.
  • FIG. 1 a partially illustrated fuel injection device with a known first hold-down in a side view
  • FIG. 2 in the fuel injection device of FIG. 1 used hold-down as a single component
  • FIG. 3 a known second embodiment of a hold-down
  • FIG. 4 an embodiment of a hold-down device according to the invention.
  • a valve in the form of an injection valve 1 for fuel injection systems of mixture-compression spark-ignited internal combustion engines is shown in a side view.
  • the fuel injection valve 1 is Part of a fuel injector.
  • the fuel injection valve 1 which is designed in the form of a direct-injection injector for injecting fuel directly into a combustion chamber of the internal combustion engine, is installed in a receiving bore of a cylinder head, not shown.
  • a sealing ring 2, in particular of Teflon®, ensures optimum sealing of the fuel injection valve 1 with respect to the wall of the cylinder head.
  • the valve receptacle can also be provided on a receiving socket of a suction pipe, not shown.
  • the fuel injection valve 1 has at its inlet-side end 3 a plug connection to a fuel distributor line 4, which is sealed by a sealing ring 5 between a connection piece 6 of the fuel distributor line 4, which is shown in section, and an inlet connection 7 of the fuel injection valve 1.
  • the fuel injection valve 1 has an electrical connection plug 8 for the electrical contacting for actuating the fuel injection valve 1.
  • a holding-down device 10 is provided between the fuel injection valve 1 and the connecting piece 6.
  • the hold-down 10 is designed as a bow-shaped component, for example as a stamped and bent part.
  • the hold-down 10 has a part-ring-shaped base element 11, wherein this base element 11, which does not rotate through 360 °, but for example has only an extension of about 250 ° to 320 °, is supported on a shoulder 12 of the fuel injection valve 1.
  • axially resilient hold-down bracket 13 of the hold-down 10 abuts a downstream end surface 14 of the connecting piece 6 to the fuel rail 4 in the installed state.
  • the hold-down 10 is interrupted, said known hold-down 10 forms a closed bracket element, in particular the FIG. 2 clarified.
  • the hold-down 10 can surround the fuel injector 1 and still allows the passage of the electrical connector plug 8.
  • the hold-down bar 13 protrudes with its resilient brackets from the connector 8 away.
  • a pin-shaped raised pin 15 is provided on the fuel injection valve 1, which corresponds to a groove-like depression or recess 16 on the connecting piece 6 of the fuel distribution line 4.
  • the protruding into the recess 16 pin 15 of the fuel injector 1 provides a direct and thus very secure rotation of the fuel injector 1 relative to the fuel rail 4 and for a reliable assignment of the rotational position of the blank holder 10 to the fuel injector 1.
  • the in the fuel injection device according to FIG. 1 used down device 10 is in the FIG. 2 again shown as a single component.
  • the hold-down 10 is characterized by the fact that, starting from a planar part-ring-shaped base element 11, at least one bent, axially resilient hold-down bar 13 extends out of the plane of the base element 11.
  • the base member 11 is formed like a plunger and surrounds the fuel injection valve 1 in the region of its inflow-side end 3.
  • the base member 11 is made flat, for example, with a thickness of about 1.5 mm, so that a large bearing surface on the shoulder 12 is present.
  • two webs 21 extend with increased width largely in the axial direction and thus substantially perpendicular to the extension plane of the base member 11. These webs 21 go kinked into the actual axially resilient hold-down bracket 13, wherein the hold-down bracket 13 composed of three essential sections.
  • the hold-down bar 13 has, starting from the webs 21, only a small axial extent, which results from two uniform oblique sections 22.
  • the oblique sections 22 merge into slightly curved contact sections 23 which, in the installed state, ultimately have touching contact with the end face 14 of the connecting piece 6.
  • a connecting portion 24 is provided, which is designed to be slightly lowered relative to the abutment portions 23 and ensures that the entire hold-down 10 is closed.
  • a likewise known hold-down device 10 In contrast to the hold-down device 10 described above, a likewise known hold-down device 10 according to FIG. 3 no connection portion 24, so that an overall open holddown 10 is present.
  • the webs 21 extend with respect to their wall thickness twisted relative to the base member 11, wherein the transition region 25 is rotated to the outside.
  • the webs 21 go over bent into the actual axially resilient hold-down bar 13, wherein the hold-down bar 13 composed of two sections.
  • the oblique sections 22 merge into slightly curved contact sections 23 which, in the installed state, ultimately have touching contact with the end face 14 of the connecting piece 6.
  • the basic element 11 of the hold-down 10 is designed edgewise and, for example, again has a wall thickness of about 1.5 mm.
  • FIG. 4 an embodiment of a hold-down 10 according to the invention is shown.
  • two transition regions 25, which further upright from the sheet metal alignment and thereby largely parallel to each other. Without rotation, the transitional regions 25 merge into the two webs 21, which are likewise largely aligned parallel to one another and extend out of the plane of the base element 11. Since no rotation takes place in the transition regions 25, the two webs 21 face with their broad sides of this sheet metal section and not with their cutting edges 27, which arise from the sheet when being removed.
  • the base element 11 opposite end of the webs 21, however, these are twisted or bent by 90 °, for example, as in FIG. 4 shown outward.
  • the inclined section 22 parallel to each other, now facing by the rotation of the cut edges 27, and back in the direction from the open area 20 back ,
  • the oblique sections 22 merge into slightly curved contact sections 23 which, in the installed state, ultimately have touching contact with the end face 14 of the connecting piece 6 and terminate separately from one another.
  • the hold-down 10 again has a wall thickness of about 1.5 mm.
  • the hold-down 10 is removed, for example, by punching, eroding or laser cutting from sheets of spring steel or stainless steel (with a thickness of about 1.5 mm) and subsequently brought into the desired shape by means of bending.
  • An opening 28 provided in the base element 11 can serve for transport reception during the production run and has no influence on the actual hold-down function.

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

Abstract

The hold-down device for a fuel injection device has a design which is simple in particular, which nonetheless enables a fuel injector (1) to be held down very effectively. The fuel injection device includes at least one fuel injector (1), a receptacle bore for the fuel injector (1) and a connecting fitting (6) of a fuel distributor line (4), the hold-down device (10) being clamped between a shoulder (12) of the fuel injector (1) and an end surface (14) of the connecting fitting (6). The hold-down device (10) has a base element (11) in the shape of a partial ring, from which an axially flexible hold-down clip (13) extends in a bent-away fashion, the clip having at least two webs (21), two oblique segments (22), and two contact segments (23). The fuel injector (1) is suitable in particular for use in fuel injection systems of mixture-compressing, externally ignited internal combustion engines.

Description

Die Erfindung geht aus von einem Niederhalter für eine Brennstoffeinspritzvorrichtung nach der Gattung des Anspruchs 1.The invention is based on a hold-down device for a fuel injection device according to the preamble of claim 1.

Es ist bereits aus der DE 29 26 490 A1 eine Befestigungsvorrichtung für ein Brennstoffeinspritzventil zur Befestigung an einem Saugrohr bekannt, bei welcher die axiale Fixierung des Brennstoffeinspritzventils an der Brennstoffverteilerleitung bzw. an einem Stecknippel durch ein Befestigungselement erfolgt, das als U-förmige Sicherungsklammer gestaltet ist, die mit zwei in radialer Richtung federnden Schenkeln versehen ist. Die Sicherungsklammer greift dabei im montierten Zustand durch entsprechende Aussparungen des Stecknippels und ist in eine als Ringnut ausgebildete Ausnehmung in einem Anschlussstutzen des Brennstoffeinspritzventils einrastbar. Das axiale Spiel zwischen den Aussparungen und der Sicherungsklammer sowie zwischen der Ringnut und der Sicherungsklammer soll dabei klein gehalten werden, um eine exakte Fixierung des Brennstoffeinspritzventils ohne Verspannungen der Dichtung zu erreichen.It is already out of the DE 29 26 490 A1 a fastening device for a fuel injection valve for attachment to a suction tube, in which the axial fixation of the fuel injection valve on the fuel distributor line or on a plug-in nipple by a fastener, which is designed as a U-shaped securing clip provided with two resiliently resilient legs is. The securing clip engages in the mounted state by corresponding recesses of the plug-in nipple and can be latched into a recess formed as an annular groove in a connecting piece of the fuel injection valve. The axial clearance between the recesses and the securing clip as well as between the annular groove and the securing clip should be kept small in order to achieve an exact fixation of the fuel injection valve without tension of the seal.

Nachteilig an der aus der DE 29 26 490 A1 bekannten Befestigungsvorrichtung ist insbesondere die verspannende Wirkung der verschiedenen Halterungsteile auf das Brennstoffeinspritzventil. Der im Brennstoffeinspritzventil erzeugte Kraftfluss führt zu Verformungen und somit zu Hubänderungen der Ventilnadel bis zum Verklemmen sowie zu einer Druck- oder Biegebelastung der Gehäuseteile, die im allgemeinen dünnwandig und an mehreren Stellen miteinander verschweißt sind. Zudem führt jede Befestigungsmaßnahme beispielsweise durch einen Auflagebund zu einer Vergrößerung der radialen Ausdehnung des Brennstoffeinspritzventils und damit zu einem erhöhten Platzbedarf beim Einbau.A disadvantage of the DE 29 26 490 A1 known fastening device is in particular the bracing effect of the various mounting parts on the fuel injection valve. The force flow generated in the fuel injection valve leads to deformations and thus to changes in the stroke of the valve needle to jamming and to a pressure or bending load of the housing parts, which are generally thin-walled and welded together at several points. In addition, each fastening measure leads, for example by a support collar to increase the radial extent of the fuel injection valve and thus to an increased space requirement during installation.

Bekannt ist bereits aus der DE 101 08 193 A1 eine Befestigungsvorrichtung zur wechselseitigen Befestigung eines Brennstoffeinspritzventils in einem Zylinderkopf einerIt is already known from the DE 101 08 193 A1 a fastening device for the mutual attachment of a fuel injection valve in a cylinder head of a

Brennkraftmaschine und des Brennstoffeinspritzventils an einer Brennstoffverteilerleitung. Die Befestigungsvorrichtung umfasst eine Hülse, die zwischen einer Schulter der Brennstoffverteilerleitung und einer Schulter des Brennstoffeinspritzventils eingespannt ist und aus einem elastischen Material ausgebildet ist. Die Hülse kann aufgrund ihrer rohrförmigen Struktur die Niederhaltekräfte nur bedingt wirksam auf das Brennstoffeinspritzventil übertragen. Die durch die Schultern von Brennstoffeinspritzventil und Brennstoffverteilerleitung beanspruchten Flächen der als Niederhalter dienenden Hülse stellen die bei der Herstellung des Rohlings der Hülse fertigungsbedingt entstehenden Schnittkanten dar.Internal combustion engine and the fuel injection valve to a fuel rail. The fastening device comprises a sleeve which is clamped between a shoulder of the fuel rail and a shoulder of the fuel injection valve and is formed of an elastic material. Due to its tubular structure, the sleeve can transfer the hold-down forces to the fuel injector only to a limited extent effectively. The claimed by the shoulders of the fuel injection valve and fuel distributor surfaces of the sleeve serving as a holding down represent the production edges resulting from the production of the blank of the sleeve cutting edges.

Verschiedene Bauformen von Niederhalteelementen sind zudem aus der DE 10 2004 048 401 A1 bekannt, auf die zum besseren Verständnis der Erfindung anhand der Figuren 1 bis 3 im Folgenden Bezug genommen wird. Einschub am Ende des 2. Absatzes auf Seite 2 der ursprünglich eingereichten AnmeldungsunterlagenDifferent types of hold-down elements are also made of DE 10 2004 048 401 A1 known, for a better understanding of the invention with reference to the FIGS. 1 to 3 hereinafter referred to. Insert at the end of the second paragraph on page 2 of the originally filed application documents

Fortsetzung mit dem Abschnitt "Vorteile der Erfindung" auf Seite 2 der ursprünglich eingereichten AnmeldungsunterlagenContinuing with the section "Advantages of the invention" on page 2 of the originally filed application documents

Vorteile der ErfindungAdvantages of the invention

Der erfindungsgemäße Niederhalter für eine Brennstoffeinspritzvorrichtung mit den kennzeichnenden Merkmalen des Anspruchs 1 hat den Vorteil, dass er eine besonders einfache Bauweise aufweist, sehr einfach und kostengünstig herstellbar ist und trotzdem eine sehr wirksame Niederhaltung eines Brennstoffeinspritzventils in einer Aufnahmebohrung eines Zylinderkopfes oder eines Ansaugrohres erzielbar ist. Mit herkömmlichen Fertigungsverfahren, wie Stanzen, Erodieren oder Laserschneiden lassen sich aus Blechen aus Federstahl bzw. Edelstahl Rohlinge für den späteren Niederhalter herauslösen und durch Biegen in zahlreiche, recht komplexe gewünschte Formen bringen. Die erfindungsgemäße Ausführungsform des Niederhalters zeichnet sich insbesondere durch seine kompakte Bauform aus, so dass der radial benötigte Bauraum speziell im Bereich des Durchtritts des Anschlusssteckers des Brennstoffeinspritzventils äußerst gering ist.The hold-down device according to the invention for a fuel injection device with the characterizing features of claim 1 has the advantage that it has a particularly simple design, is very simple and inexpensive to produce and still a very effective holddown of a fuel injector in a receiving bore of a cylinder head or an intake pipe is achieved. With conventional manufacturing processes, such as stamping, eroding or laser cutting, blanks for the subsequent hold-down can be removed from sheets of spring steel or stainless steel and bent into numerous, quite complex desired shapes. The inventive embodiment of the hold-down is characterized in particular by its compact design, so that the radially required space is extremely low, especially in the region of the passage of the connector of the fuel injection valve.

Mit dem erfindungsgemäßen Niederhalter ohne Mittel zur Verdrehfixierung ist eine genauere Ausrichtung des Brennstoffeinspritzventils gegenüber bekannten Niederhaltern mit integrierten Verdrehfixierungen möglich, da die Bauteiltoleranzen des Niederhalters für die Verdrehfixierung durch die erfindungsgemäße Ausgestaltung entfallen. Der Niederhalter kann zudem größere axiale Toleranzen ausgleichen, als dies mit bekannten Niederhaltern möglich ist. Vor allen Dingen in Verbindung mit der Brennstoffeinspritzvorrichtung, die eine einfache Verdrehfixierung aufweist, ergeben sich die oben angegebenen Vorteile.With the hold-down device according to the invention without means for Verdrehfixierung a more accurate alignment of the fuel injector over known holddowns with integrated Verdrehfixierungen is possible, since the component tolerances of the hold-down for Verdrehfixierung omitted by the inventive design. The hold-down device can also compensate for larger axial tolerances than is possible with known hold-downs. Above all, in connection with the fuel injection device, which has a simple Verdrehfixierung, the above-mentioned advantages.

Aus der DE 10 2004 048 401 A1 sind bereits Niederhalter für eine Brennstoffeinspritzvorrichtung bekannt, die sich durch eine besonders einfache Bauweise auszeichnen, die trotzdem eine sehr wirksame Niederhaltung eines Brennstoffeinspritzventils erlauben. Die Brennstoffeinspritzvorrichtung umfasst wenigstens ein Brennstoffeinspritzventil, eine Aufnahmebohrung für das Brennstoffeinspritzventil und einen Anschlussstutzen einer Brennstoffverteilerleitung, wobei der Niederhalter zwischen einer Schulter des Brennstoffeinspritzventils und einer Endfläche des Anschlussstutzens eingespannt ist. Der Niederhalter weist ein teilringförmiges Grundelement auf, von dem sich aus abgebogen ein axial nachgiebiger Niederhaltebügel erstreckt, der wenigstens zwei Stege, zwei Schrägabschnitte und zwei Anlageabschnitte besitzt.From the DE 10 2004 048 401 A1 already hold-down for a fuel injection device are known, which are characterized by a particularly simple design, yet allow a very effective holddown of a fuel injector. The fuel injector includes at least one fuel injector, a fuel injector containment bore, and a fuel rail manifold, the hold down being clamped between a shoulder of the fuel injector and an end surface of the port. The hold-down device has a part-ring-shaped base element, from which an axially compliant hold-down bracket extends, which has at least two webs, two inclined sections and two contact sections.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Anspruch 1 angegebenen Niederhalters möglich.The measures listed in the dependent claims advantageous refinements and improvements of the claim 1 hold-down are possible.

Von Vorteil ist es, den Niederhalter als Stanz-Biege-Teil auszuführen und derart zu formen und in einer Brennstoffeinspritzvorrichtung zu verbauen, dass die durch Biegespannung beanspruchten Flächen der Schrägabschnitte und Anlageabschnitte des Niederhalters senkrecht zu den Schnittkanten verlaufen, die beim Herauslösen des Rohlings für den Niederhalter aus dem entsprechenden Blech entstehen. Auf diese Weise lässt sich die dauerhafte Belastbarkeit der auf Biegung beanspruchten Abschnitte des Niederhaltebügels des Niederhalters erhöhen und eine optimale Niederhaltekraft auf das Brennstoffeinspritzventil zur sicheren Fixierung in der Aufnahmebohrung erzielen.It is advantageous to carry out the hold-down as a stamped and bent part and shape and obstruct in a fuel injector that the stress of bending stress surfaces of the inclined portions and abutment portions of the blank perpendicular to the cutting edges, the release of the blank for the Hold-downs from the corresponding sheet arise. In this way, the permanent load capacity of the stressed portions of the hold-down bracket of the hold-down can be increased and achieve an optimum hold-down force on the fuel injection valve for secure fixation in the receiving bore.

Besonders vorteilhaft ist es, den Niederhalter in Umfangsrichtung gesehen derart mit einem offenen Bereich zu versehen, dass dieser von dem Anschlussstecker des Brennstoffeinspritzventils durchragt wird, so dass für den Niederhalter eine eindeutige Einbauposition definiert ist. Eine Verdrehfixierung des Niederhalters gegenüber dem Anschlussstutzen entfällt durch die Paarung Zapfen/Ausnehmung am Brennstoffeinspritzventil/Anschlussstutzen. Der Niederhalter ist dabei derart am Brennstoffeinspritzventil montiert, dass ein durch Biegespannung beanspruchter Niederhaltebügel vom Anschlussstecker des Brennstoffeinspritzventils weg gerichtet ist.It is particularly advantageous to provide the hold-down device in the circumferential direction with an open area in such a way that it is penetrated by the connection plug of the fuel injection valve, so that an unambiguous installation position is defined for the hold-down device. A Verdrehfixierung the blank holder relative to the connection piece is eliminated by the mating pin / recess on the fuel injector / nozzle. The holding-down device is mounted on the fuel injection valve in such a way that a hold-down clip subjected to bending stress is directed away from the connection plug of the fuel injection valve.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 ein teilweise dargestellte Brennstoffeinspritzvorrichtung mit einem bekannten ersten Niederhalter in einer Seitenansicht, Figur 2 den in der Brennstoffeinspritzvorrichtung der Figur 1 verwendeten Niederhalter als Einzelbauteil, Figur 3 eine bekannte zweite Ausführungsform eines Niederhalters und Figur 4 eine erfindungsgemäße Ausführungsform eines Niederhalters.An embodiment of the invention is shown in simplified form in the drawing and explained in more detail in the following description. Show it FIG. 1 a partially illustrated fuel injection device with a known first hold-down in a side view, FIG. 2 in the fuel injection device of FIG. 1 used hold-down as a single component, FIG. 3 a known second embodiment of a hold-down and FIG. 4 an embodiment of a hold-down device according to the invention.

Beschreibung des AusführungsbeispielsDescription of the embodiment

In der Figur 1 ist als ein bekanntes Beispiel ein Ventil in der Form eines Einspritzventils 1 für Brennstoffeinspritzanlagen von gemischverdichtenden fremdgezündeten Brennkraftmaschinen in einer Seitenansicht dargestellt. Das Brennstoffeinspritzventil 1 ist Teil einer Brennstoffeinspritzvorrichtung. Mit einem stromabwärtigen Ende ist das Brennstoffeinspritzventil 1, das in Form eines direkt einspritzenden Einspritzventils zum direkten Einspritzen von Brennstoff in einen Brennraum der Brennkraftmaschine ausgeführt ist, in eine Aufnahmebohrung eines nicht dargestellten Zylinderkopfes eingebaut. Ein Dichtring 2, insbesondere aus Teflon ®, sorgt für eine optimale Abdichtung des Brennstoffeinspritzventils 1 gegenüber der Wandung des Zylinderkopfes. Die Ventilaufnahme kann ebenso an einem Aufnahmestutzen eines nicht dargestellten Ansaugrohrs vorgesehen sein.In the FIG. 1 As a known example, a valve in the form of an injection valve 1 for fuel injection systems of mixture-compression spark-ignited internal combustion engines is shown in a side view. The fuel injection valve 1 is Part of a fuel injector. With a downstream end, the fuel injection valve 1, which is designed in the form of a direct-injection injector for injecting fuel directly into a combustion chamber of the internal combustion engine, is installed in a receiving bore of a cylinder head, not shown. A sealing ring 2, in particular of Teflon®, ensures optimum sealing of the fuel injection valve 1 with respect to the wall of the cylinder head. The valve receptacle can also be provided on a receiving socket of a suction pipe, not shown.

Das Brennstoffeinspritzventil 1 weist an seinem zulaufseitigen Ende 3 eine Steckverbindung zu einer Brennstoffverteilerleitung 4 auf, die durch einen Dichtring 5 zwischen einem Anschlussstutzen 6 der Brennstoffverteilerleitung 4, der im Schnitt dargestellt ist, und einem Zulaufstutzen 7 des Brennstoffeinspritzventils 1 abgedichtet ist. Das Brennstoffeinspritzventil 1 verfügt über einen elektrischen Anschlussstecker 8 für die elektrische Kontaktierung zur Betätigung des Brennstoffeinspritzventils 1.The fuel injection valve 1 has at its inlet-side end 3 a plug connection to a fuel distributor line 4, which is sealed by a sealing ring 5 between a connection piece 6 of the fuel distributor line 4, which is shown in section, and an inlet connection 7 of the fuel injection valve 1. The fuel injection valve 1 has an electrical connection plug 8 for the electrical contacting for actuating the fuel injection valve 1.

Um das Brennstoffeinspritzventil 1 und die Brennstoffverteilerleitung 4 radialkraftfrei voneinander zu beabstanden und das Brennstoffeinspritzventil 1 sicher in der Aufnahmebohrung des Zylinderkopfes oder Ansaugrohrs niederzuhalten, ist ein Niederhalter 10 zwischen dem Brennstoffeinspritzventil 1 und dem Anschlussstutzen 6 vorgesehen. Der Niederhalter 10 ist als bügelförmiges Bauteil ausgeführt, z.B. als Stanz-Biege-Teil. Der Niederhalter 10 weist ein teilringförmiges Grundelement 11 auf, wobei sich dieses Grundelement 11, das nicht um 360° umläuft, sondern z.B. nur eine Erstreckung von ca. 250° bis 320° besitzt, an einer Schulter 12 des Brennstoffeinspritzventils 1 abstützt. Mit einem von dem ebenen Grundelement 11 aus abgebogenen, axial nachgiebigen Niederhaltebügel 13 liegt der Niederhalter 10 an einer stromabwärtigen Endfläche 14 des Anschlussstutzens 6 an der Brennstoffverteilerleitung 4 im eingebauten Zustand an. Im Bereich des elektrischen Anschlusssteckers 8 ist der Niederhalter 10 unterbrochen, wobei dieser bekannte Niederhalter 10 an sich ein geschlossenes Bügelelement bildet, wie insbesondere die Figur 2 verdeutlicht. Auf diese Weise kann der Niederhalter 10 das Brennstoffeinspritzventil 1 umschließen und ermöglicht trotzdem das Durchragen des elektrischen Anschlusssteckers 8. Der Niederhaltebügel 13 ragt mit seinen federnden Bügeln vom Anschlussstecker 8 weg.In order to space the fuel injection valve 1 and the fuel distributor line 4 radially from one another and to hold down the fuel injection valve 1 securely in the receiving bore of the cylinder head or intake pipe, a holding-down device 10 is provided between the fuel injection valve 1 and the connecting piece 6. The hold-down 10 is designed as a bow-shaped component, for example as a stamped and bent part. The hold-down 10 has a part-ring-shaped base element 11, wherein this base element 11, which does not rotate through 360 °, but for example has only an extension of about 250 ° to 320 °, is supported on a shoulder 12 of the fuel injection valve 1. With a bent from the flat base member 11, axially resilient hold-down bracket 13 of the hold-down 10 abuts a downstream end surface 14 of the connecting piece 6 to the fuel rail 4 in the installed state. In the area of the electrical connection plug 8, the hold-down 10 is interrupted, said known hold-down 10 forms a closed bracket element, in particular the FIG. 2 clarified. In this way, the hold-down 10 can surround the fuel injector 1 and still allows the passage of the electrical connector plug 8. The hold-down bar 13 protrudes with its resilient brackets from the connector 8 away.

Im Übergangsbereich des elektrischen Anschlusssteckers 8 zur das Brennstoffeinspritzventil 1 zumindest teilweise im Bereich des Zulaufstutzens 7 umhüllenden Kunststoffumspritzung ist am Brennstoffeinspritzventil 1 ein stiftförmiger erhabener Zapfen 15 vorgesehen, der mit einer nutähnlichen Vertiefung oder Ausnehmung 16 am Anschlussstutzen 6 der Brennstoffverteilerleitung 4 korrespondiert. Der in die Ausnehmung 16 ragende Zapfen 15 des Brennstoffeinspritzventils 1 sorgt für eine direkte und damit sehr sichere Verdrehsicherung des Brennstoffeinspritzventils 1 gegenüber der Brennstoffverteilerleitung 4 und für eine sichere Zuordnung der Drehlage des Niederhalters 10 zum Brennstoffeinspritzventil 1. Andererseits ist mit dem Niederhalter 10 eine genauere Ausrichtung des Brennstoffeinspritzventils 1 gegenüber bekannten Niederhaltern mit integrierten Verdrehfixierungen möglich, da die Bauteiltoleranzen des Niederhalters 10 für die Verdrehfixierung durch diese Ausgestaltung entfallen.In the transition region of the electrical connector 8 to the fuel injection valve 1 at least partially in the region of the inlet nozzle 7th Enveloping plastic injection molding a pin-shaped raised pin 15 is provided on the fuel injection valve 1, which corresponds to a groove-like depression or recess 16 on the connecting piece 6 of the fuel distribution line 4. The protruding into the recess 16 pin 15 of the fuel injector 1 provides a direct and thus very secure rotation of the fuel injector 1 relative to the fuel rail 4 and for a reliable assignment of the rotational position of the blank holder 10 to the fuel injector 1. On the other hand, with the hold-10 a more accurate alignment the fuel injection valve 1 compared to known hold-downs with integrated Verdrehfixierungen possible, since the component tolerances of the blank holder 10 accounts for the Verdrehfixierung by this configuration.

Der in der Brennstoffeinspritzvorrichtung gemäß Figur 1 eingesetzte Niederhalter 10 ist in der Figur 2 nochmals als Einzelbauteil gezeigt. Der Niederhalter 10 zeichnet sich dadurch aus, dass sich ausgehend von einem ebenen teilringförmigen Grundelement 11 wenigstens ein abgebogener, axial nachgiebiger Niederhaltebügel 13 aus der Ebene des Grundelements 11 heraus erstreckt. Das Grundelement 11 ist spangenförmig ausgebildet und umgibt das Brennstoffeinspritzventil 1 im Bereich seines zulaufseitigen Endes 3. Bei dem in Figur 2 dargestellten Niederhalter 10 ist das Grundelement 11 flach z.B. mit einer Dicke von ca. 1,5 mm ausgeführt, so dass eine große Auflagefläche an der Schulter 12 vorliegt.The in the fuel injection device according to FIG. 1 used down device 10 is in the FIG. 2 again shown as a single component. The hold-down 10 is characterized by the fact that, starting from a planar part-ring-shaped base element 11, at least one bent, axially resilient hold-down bar 13 extends out of the plane of the base element 11. The base member 11 is formed like a plunger and surrounds the fuel injection valve 1 in the region of its inflow-side end 3. In the in FIG. 2 illustrated hold-down 10, the base member 11 is made flat, for example, with a thickness of about 1.5 mm, so that a large bearing surface on the shoulder 12 is present.

Vom Grundelement 11 erstrecken sich zwei Stege 21 mit vergrößerter Breite weitgehend in axialer Richtung und somit weitgehend senkrecht zur Erstreckungsebene des Grundelements 11. Diese Stege 21 gehen abgeknickt in den eigentlichen axial nachgiebigen Niederhaltebügel 13 über, wobei sich der Niederhaltebügel 13 aus drei wesentlichen Abschnitten zusammensetzt. Der Niederhaltebügel 13 weist ausgehend von den Stegen 21 nur noch eine geringe axiale Ausdehnung auf, die sich durch zwei gleichförmige Schrägabschnitte 22 ergibt. Die Schrägabschnitte 22 gehen in leicht gewölbte Anlageabschnitte 23 über, die letztlich im eingebauten Zustand berührenden Kontakt zur Endfläche 14 des Anschlussstutzens 6 besitzen. Zwischen den Anlageabschnitten 23 ist ein Verbindungsabschnitt 24 geschaffen, der gegenüber den Anlageabschnitten 23 etwas gesenkt ausgeführt ist und dafür sorgt, dass der gesamte Niederhalter 10 geschlossen ist.From the base member 11, two webs 21 extend with increased width largely in the axial direction and thus substantially perpendicular to the extension plane of the base member 11. These webs 21 go kinked into the actual axially resilient hold-down bracket 13, wherein the hold-down bracket 13 composed of three essential sections. The hold-down bar 13 has, starting from the webs 21, only a small axial extent, which results from two uniform oblique sections 22. The oblique sections 22 merge into slightly curved contact sections 23 which, in the installed state, ultimately have touching contact with the end face 14 of the connecting piece 6. Between the abutment portions 23, a connecting portion 24 is provided, which is designed to be slightly lowered relative to the abutment portions 23 and ensures that the entire hold-down 10 is closed.

Im Unterschied zum zuvor beschriebenen Niederhalter 10 weist ein ebenfalls bekannter Niederhalter 10 gemäß Figur 3 keinen Verbindungsabschnitt 24 auf, so dass insgesamt ein offener Niederhalter 10 vorliegt. Vom Grundelement 11 erstrecken sich wiederum zwei Stege 21 weitgehend in axialer Richtung und somit weitgehend senkrecht zur Erstreckungsebene des Grundelements 11. Die Stege 21 verlaufen bezüglich ihrer Wandungsdicke verdreht gegenüber dem Grundelement 11, wobei der Übergangsbereich 25 nach außen gedreht ist. Die Stege 21 gehen abgeknickt in den eigentlichen axial nachgiebigen Niederhaltebügel 13 über, wobei sich der Niederhaltebügel 13 aus jeweils zwei Abschnitten zusammensetzt. Die Niederhaltebügel 13 weisen ausgehend von den Stegen 21 nur noch eine geringe axiale Ausdehnung auf, die sich durch zwei gleichförmige Schrägabschnitte 22 ergibt. Die Schrägabschnitte 22 gehen in leicht gewölbte Anlageabschnitte 23 über, die letztlich im eingebauten Zustand berührenden Kontakt zur Endfläche 14 des Anschlussstutzens 6 besitzen. Das Grundelement 11 des Niederhalters 10 ist hochkant ausgelegt und besitzt z.B. wiederum eine Wandstärke von ca. 1,5 mm.In contrast to the hold-down device 10 described above, a likewise known hold-down device 10 according to FIG FIG. 3 no connection portion 24, so that an overall open holddown 10 is present. From the base element 11 again extend two Webs 21 largely in the axial direction and thus substantially perpendicular to the plane of extension of the base member 11. The webs 21 extend with respect to their wall thickness twisted relative to the base member 11, wherein the transition region 25 is rotated to the outside. The webs 21 go over bent into the actual axially resilient hold-down bar 13, wherein the hold-down bar 13 composed of two sections. The hold-down bar 13, starting from the webs 21 only a small axial extent, resulting in two uniform oblique sections 22. The oblique sections 22 merge into slightly curved contact sections 23 which, in the installed state, ultimately have touching contact with the end face 14 of the connecting piece 6. The basic element 11 of the hold-down 10 is designed edgewise and, for example, again has a wall thickness of about 1.5 mm.

In der Figur 4 ist eine erfindungsgemäße Ausführungsform eines Niederhalters 10 dargestellt. Ausgehend von einem hochkant stehenden Grundelement 11 schließen sich auf der Seite des offenen Bereichs 20, der von dem Anschlussstecker 8 des Brennstoffeinspritzventils 1 durchragt wird, zwei Übergangsbereiche 25 an, die von der Blechausrichtung weiter hochkant und dabei aber weitgehend parallel zueinander verlaufen. Ohne Verdrehung gehen die Übergangsbereiche 25 in die zwei Stege 21 über, die ebenfalls weitgehend parallel zueinander ausgerichtet sind und sich aus der Ebene des Grundelements 11 heraus erstrecken. Da keine Verdrehung in den Übergangsbereichen 25 erfolgt, stehen sich die beiden Stege 21 mit ihren Breitseiten dieses Blechabschnitts gegenüber und nicht mit ihren Schnittkanten 27, die beim Herauslösen aus dem Blech entstehen. Am dem Grundelement 11 abgewandten Ende der Stege 21 sind diese jedoch verdreht bzw. um 90° gebogen, z.B. wie in Figur 4 gezeigt nach außen hin. Von diesen umgebogenen Endbereichen der Stege 21 des Niederhaltebügels 13 aus erstrecken sich axial weiter ansteigend zwei gleichförmige Schrägabschnitte 22. Die Schrägabschnitt 22 verlaufen parallel zueinander, wobei sich durch die Drehung nun die Schnittkanten 27 gegenüberstehen, und wieder in Richtung vom offenen Bereich 20 aus gesehen zurück. Die Schrägabschnitte 22 gehen in leicht gewölbte Anlageabschnitte 23 über, die letztlich im eingebauten Zustand berührenden Kontakt zur Endfläche 14 des Anschlussstutzens 6 besitzen und separat voneinander enden. Der Niederhalter 10 besitzt z.B. wiederum eine Wandstärke von ca. 1,5 mm.In the FIG. 4 an embodiment of a hold-down 10 according to the invention is shown. Starting from an upright basic element 11 close to the side of the open area 20, which is penetrated by the connector 8 of the fuel injection valve 1, two transition regions 25, which further upright from the sheet metal alignment and thereby largely parallel to each other. Without rotation, the transitional regions 25 merge into the two webs 21, which are likewise largely aligned parallel to one another and extend out of the plane of the base element 11. Since no rotation takes place in the transition regions 25, the two webs 21 face with their broad sides of this sheet metal section and not with their cutting edges 27, which arise from the sheet when being removed. At the base element 11 opposite end of the webs 21, however, these are twisted or bent by 90 °, for example, as in FIG. 4 shown outward. Of these bent end portions of the webs 21 of the hold-down 13 extending axially further increasing two uniform oblique sections 22. The inclined section 22 parallel to each other, now facing by the rotation of the cut edges 27, and back in the direction from the open area 20 back , The oblique sections 22 merge into slightly curved contact sections 23 which, in the installed state, ultimately have touching contact with the end face 14 of the connecting piece 6 and terminate separately from one another. The hold-down 10, for example, again has a wall thickness of about 1.5 mm.

Der Niederhalter 10 wird z.B. mittels Stanzen, Erodieren oder Laserschneiden aus Blechen aus Federstahl bzw. Edelstahl (mit einer Dicke von ca. 1,5 mm) herausgelöst und nachfolgend mittels Biegen in die gewünschte Form gebracht.The hold-down 10 is removed, for example, by punching, eroding or laser cutting from sheets of spring steel or stainless steel (with a thickness of about 1.5 mm) and subsequently brought into the desired shape by means of bending.

Eine in dem Grundelement 11 vorgesehene Öffnung 28 kann der Transportaufnahme während des Fertigungsdurchlaufs dienen und hat auf die eigentliche Niederhaltefunktion keinen Einfluss.An opening 28 provided in the base element 11 can serve for transport reception during the production run and has no influence on the actual hold-down function.

Claims (9)

  1. Hold-down member for a fuel injection device which comprises at least one fuel injection valve (1), a receiving bore for the fuel injection valve (1) and a connector (6) for a fuel distribution line (4), wherein the hold-down member (10) is clamped between a shoulder (12) of the fuel injection valve (1) and an end surface (14) of the connector (6), wherein the hold-down member (10) has a partially annular basic element (11) from which an axially flexible hold-down bracket (13) extends, the hold-down bracket (13) having at least two webs (21), two oblique portions (22) and two bearing portions (23), and wherein the basic element (11) is designed as a partial ring which stands on edge and the wall thickness of which corresponds to the plate thickness used, characterized in that the basic element (11) merges into the two webs (21) of the hold-down bracket (13) in such a manner that the webs (21) which extend out of the plane of the basic element (11) face each other by the wide plate sides thereof, and the webs (21) are bent at the end thereof which faces away from the basic element (11) in such a manner that the oblique sections (22) extend from the bent-over end regions of the webs (21) such that the cut edges (27) in the plate now face each other.
  2. Hold-down member according to Claim 1, characterized in that the basic element (11) of the hold-down member (10) can be placed onto the shoulder (12) of the fuel injection valve (1).
  3. Hold-down member according to Claim 1 or 2, characterized in that the bearing portions (23) of the hold-down bracket (13) can be placed onto the end surface (14) of the connector (6).
  4. Hold-down member according to one of the preceding claims, characterized in that the surfaces of the oblique portions (22) and bearing portions (23), which surfaces are subjected to bending stress, run perpendicularly to the cut edges (27) which are produced when the blank for the hold-down member (10) is detached from the corresponding plate.
  5. Hold-down member according to one of the preceding claims, characterized in that it is designed as a punched and bent part.
  6. Hold-down member according to one of the preceding claims, characterized in that the plate used for the hold-down member (10) consists of spring steel or special steel.
  7. Hold-down member according to Claim 4 or 6, characterized in that the hold-down member (10) has a wall thickness of approx. 1.5 mm corresponding to the plate thickness used.
  8. Hold-down member according to one of Claims 1 to 7, characterized in that the two bearing portions (23) of the hold-down bracket (13) end the latter such that the hold-down member (10) is open.
  9. Hold-down member according to one of the preceding claims, characterized in that the webs (21) are bent outwards at the end regions thereof which face away from the basic element (11) in order to merge from there into the oblique portions (22).
EP09753724A 2008-05-30 2009-04-07 Hold-down member for a fuel injection device Active EP2286081B1 (en)

Applications Claiming Priority (2)

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DE102008002122A DE102008002122A1 (en) 2008-05-30 2008-05-30 Downholder for a fuel injection device
PCT/EP2009/054137 WO2009144069A1 (en) 2008-05-30 2009-04-07 Hold-down member for a fuel injection device

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EP2286081A1 EP2286081A1 (en) 2011-02-23
EP2286081B1 true EP2286081B1 (en) 2011-10-05

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US (1) US8707930B2 (en)
EP (1) EP2286081B1 (en)
JP (1) JP5243601B2 (en)
KR (1) KR101562838B1 (en)
CN (1) CN102046958B (en)
AT (1) ATE527443T1 (en)
DE (1) DE102008002122A1 (en)
WO (1) WO2009144069A1 (en)

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CN102046958A (en) 2011-05-04
DE102008002122A1 (en) 2009-12-03
JP2011522147A (en) 2011-07-28
US20110186016A1 (en) 2011-08-04
JP5243601B2 (en) 2013-07-24
KR20110010745A (en) 2011-02-07
WO2009144069A1 (en) 2009-12-03
CN102046958B (en) 2013-08-21
US8707930B2 (en) 2014-04-29
KR101562838B1 (en) 2015-10-23
ATE527443T1 (en) 2011-10-15
EP2286081A1 (en) 2011-02-23

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