EP3234346B1 - Fuel injection device - Google Patents

Fuel injection device Download PDF

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Publication number
EP3234346B1
EP3234346B1 EP15784719.5A EP15784719A EP3234346B1 EP 3234346 B1 EP3234346 B1 EP 3234346B1 EP 15784719 A EP15784719 A EP 15784719A EP 3234346 B1 EP3234346 B1 EP 3234346B1
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EP
European Patent Office
Prior art keywords
fuel injection
injection valve
decoupling element
receiving bore
injection device
Prior art date
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Active
Application number
EP15784719.5A
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German (de)
French (fr)
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EP3234346A1 (en
Inventor
Johann Bayer
Wilhelm Reinhardt
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP3234346A1 publication Critical patent/EP3234346A1/en
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    • 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 F02M39/00Ā -Ā 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 F02M39/00Ā -Ā F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02Ā -Ā 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/85—Mounting of fuel injection apparatus
    • F02M2200/858—Mounting of fuel injection apparatus sealing arrangements between injector and engine

Definitions

  • the invention relates to a fuel injection device according to the preamble of the main claim.
  • a fuel injection device known from the prior art in which a flat intermediate element is provided on a fuel injection valve installed in a receiving bore of a cylinder head of an internal combustion engine.
  • such intermediate elements are deposited as support elements in the form of a washer on a shoulder of the receiving bore of the cylinder head.
  • manufacturing and assembly tolerances are compensated for and a lateral force-free bearing is ensured even when the fuel injector is slightly inclined.
  • the fuel injection device is particularly suitable for use in fuel injection systems of mixed-compression spark-ignition internal combustion engines.
  • the intermediate element is a washer with a circular cross-section, which is arranged in an area in which both the fuel injector and the wall of the mounting hole in the cylinder head run in the shape of a truncated cone, and serves as a compensating element for mounting and supporting the fuel injector.
  • Intermediate elements for fuel injection devices which are more complicated and much more complex to manufacture, are also known from DE 100 27 662 A1 , DE 100 38 763 A1 and EP 1 223 337 A1 known. These intermediate elements are characterized by the fact that they are all made up of several parts or several layers, and some of them are supposed to perform sealing and damping functions. That from the DE 100 27 662 A1 Known intermediate element comprises a base and carrier body, in which a sealant is used, which is penetrated by a nozzle body of the fuel injector. From the DE 100 38 763 A1 a multilayer compensation element is known, which is composed of two rigid rings and an elastic intermediate ring arranged between them in a sandwich-like manner. This compensating element enables both the tilting of the fuel injector to the axis of the receiving bore over a relatively large angular range and also a radial displacement of the fuel injector from the central axis of the receiving bore.
  • a multilayer intermediate element is also from the EP 1 223 337 A1 known, this intermediate element is composed of several washers, which consist of a damping material.
  • the damping material made of metal, rubber or PTFE is selected and designed in such a way that noise dampening of the vibrations and noises generated by the operation of the fuel injector is made possible.
  • the intermediate element must comprise four to six layers in order to achieve a desired damping effect.
  • the US 6,009,856 A also propose to surround the fuel injector with a sleeve and to fill the resulting space with an elastic, noise-damping compound.
  • this type of noise reduction is very complex, unfriendly to assemble and expensive.
  • the fuel injection device for fuel injection systems of internal combustion engines, in particular for the direct injection of fuel into a combustion chamber, is already known.
  • the fuel injection device comprises at least one fuel injection valve and a receiving bore for the fuel injection valve.
  • a sealing element is introduced between a valve housing of the fuel injection valve and a wall of the receiving bore.
  • the sealing element is arranged on the fuel injector in such a way that it is secured against loss, in that a securing O-ring is applied below the sealing element on the outer circumference of the fuel injector.
  • the O-ring is a closed ring made of a rubber such as Perbunan, which dissolves during the operation of the internal combustion engine.
  • a fuel injection device which comprises at least one fuel injection valve and a receiving bore for the fuel injection valve and in which a sealing washer is introduced between a valve housing of the fuel injection valve and a wall of the receiving bore and is fixed to the fuel injection valve by a prestressed elastomer ring.
  • the fuel injection device according to the invention with the characterizing features of claim 1 has the advantage that it is very simple and inexpensive to apply a loss protection for the decoupling element on the fuel injection valve, as a result of which the decoupling element cannot slip before the fuel injection valve is installed in the receiving bore.
  • the securing against loss is taken over according to the invention by a compact, massive and nevertheless filigree locking ring which is arranged below the decoupling element on the outer circumference of the fuel injection valve.
  • the retaining ring is characterized by a particularly high level of functional integration, since the retaining ring, which is a solid component, is formed with functional areas that protrude in different directions, which hold, secure, center, preposition and insert without damage and serving.
  • the decoupling element is characterized by a low overall height, which means that it can also be used in a small installation space.
  • the decoupling element also has great fatigue strength even at high temperatures.
  • the decoupling element is very simple and inexpensive to manufacture. The entire suspension of the system consisting of fuel injector and decoupling element can also be easily and quickly assembled or disassembled.
  • a valve in the form of an injection valve 1 for fuel injection systems of mixed-compression spark-ignition internal combustion engines is shown in a side view.
  • the fuel injection valve 1 is part of the fuel injection device.
  • the fuel injection valve 1 which is designed in the form of a direct injection fuel injector for the direct injection of fuel into a combustion chamber 25 of the internal combustion engine, is installed in a receiving bore 20 of a cylinder head 9.
  • a sealing ring 2, in particular made of Teflon TM, ensures an optimal seal of the fuel injection valve 1 with respect to the wall of the receiving bore 20 of the cylinder head 9.
  • a flat intermediate element 24 which is designed as a support element in the form of a washer, is inserted at right angles to the longitudinal extension of the receiving bore 20 shoulder 23 of the receiving bore 20.
  • the fuel injection valve 1 has at its inlet end 3 a plug connection to a fuel rail 4, which is sealed by a sealing ring 5 between a connecting piece 6 of the fuel rail 4, which is shown in section, and an inlet nozzle 7 of the fuel injector 1.
  • the fuel injection valve 1 is inserted into a receiving opening 12 of the connecting piece 6 of the fuel distributor line 4.
  • the connecting piece 6 emerges, for example, in one piece from the actual fuel distributor line 4 and has, upstream of the receiving opening 12, a smaller-diameter flow opening 15, via which the flow to the fuel injection valve 1 takes place.
  • the fuel injector 1 has via an electrical connector 8 for the electrical contact for actuating the fuel injector 1.
  • a hold-down device 10 is provided between the fuel injector 1 and the connecting piece 6.
  • the hold-down device 10 is designed as a bow-shaped component, e.g. as a stamped and bent part.
  • the hold-down device 10 has a partially ring-shaped base element 11, from which a hold-down bracket 13 extends, which bears against a downstream end face 14 of the connecting piece 6 on the fuel distributor line 4 in the installed state.
  • the mounting of the fuel injection valve 1 on the passive intermediate element 24 in the receiving bore 20 of the cylinder head 9 can be represented as a conventional spring-mass damper system, as shown in FIG Figure 2 is shown.
  • the mass M of the cylinder head 9 can be assumed to be infinitely large compared to the mass m of the fuel injector 1.
  • the transmission behavior of such a system is characterized by an amplification at low frequencies in the range of the resonance frequency f R and an isolation range above the decoupling frequency f E (see Figure 3 ).
  • the decoupling element 25 with its cushion-like cross-section is further designed over its annular course so that a lower, e.g. largely flat end face 26 is provided, which rests on a shoulder 23 of the receiving bore 20 in the cylinder head 9, and an upper end face 27 is provided which rises conically from radially outside to radially inside and makes contact with a spherically curved shoulder surface 21 of the valve housing 22 of the Has fuel injector 1.
  • FIG 4 is a cross section through a decoupling element 25 in an installation situation on a fuel injection valve 1 in the area of the in Figure 1 shown disc-shaped intermediate element 24, wherein the intermediate element 24 is replaced by the decoupling element 25.
  • the decoupling element 25 is arranged on the fuel injection valve 1 in such a way that it is secured against loss, in that a securing ring 29 is applied below the decoupling element 25 on the outer circumference of the fuel injection valve 1.
  • the locking ring 29 represents a closed plastic ring.
  • the locking ring 29 is characterized as a solid component that is small and compact and has functional areas that protrude in different directions.
  • the decoupling element 25 must be securely attached to the fuel injector 1 in order to enable the fuel injector 1 and the decoupling element 25 to be assembled and disassembled at the OEM in the cylinder head 9 of the internal combustion engine. In this way, the OEM only has to handle one complete assembly.
  • the radially furthest inward functional area is a holding area 30, which corresponds to a groove 31 made in the valve housing 22.
  • an inclined area 32 pointing in the direction of the decoupling element 25 extends with an insertion bevel, which is intended to perform a pre-positioning function.
  • the radially outermost functional area is a securing area 33, which engages radially under the decoupling element 25 (with a small axial distance, at least in the installed state), so that the decoupling element 25 cannot slip off the fuel injector 1 before it is installed in the receiving bore 20 .
  • a downwardly projecting functional area is a centering area 34, which is designed like a ring collar and bears against the valve housing 22 with a clearance fit.
  • the locking ring 29 is just as compact and its outer dimensions are such that, in the event of the fuel injection valve 1 being deflected / tilted, there is no contact between the wall of the receiving bore 20 of the cylinder head 9 and the locking ring 29. This would again lead to a lateral force input on the fuel injection valve 1 and thus to an undesirable bend. In addition, a secure holding of the locking ring 29 on the fuel injector 1 would no longer be guaranteed over the entire service life.
  • the retaining ring 29 made of plastic is conditioned before it is installed on the fuel injector 1.
  • the plastic is specifically enriched with water to swell. This increases its elasticity without tears or the like. arise in the structure of the plastic.
  • the locking ring 29 is stretched over a collar 37 on the valve housing 22.
  • the resulting load is compatible due to the specially conditioned condition for the locking ring 29.
  • the fuel injection valve 1 has an insertion slope of, for example, 30 Ā° on its collar 37. A short cylindrical section on the collar 37 provided above the insertion slope helps to reliably prevent the locking ring 29 from being turned over during assembly.
  • the locking ring 29 is equipped with the inclined area 32, which has an insertion bevel of, for example, 45 Ā°.
  • the groove 31 made on the valve housing 22 ensures that the holding area 30 following the inclined area 32 is caught, so that it is prevented that none in the installed state Contact or a seat "on block" on the decoupling element 25 is present. Otherwise, the pivotability of the fuel injection valve 1 would be considerably restricted.
  • the locking ring 29 is designed with pressure in the groove 31, that is to say the maximum inner diameter of the locking ring 29 is smaller than the minimum outer diameter of the groove base on the valve housing 22.
  • the decoupling element 25 has on its upper side the conical or conical end face 27, which in the installed state corresponds to the spherical or spherical, convexly curved shoulder surface 21 of the valve housing 22 of the fuel injection valve 1.
  • the shoulder surface 21 of the valve housing 22 is formed on a radially outwardly projecting shoulder 28.
  • the shoulder surface 21 of the valve housing 22 does not have to be spherically arched throughout; such a shape is sufficient in the contact area with the conical end face 27 of the decoupling element 25.
  • the respective transitions of the upper end face 27 and the lower end face 26 to the two inner and outer annular jacket surfaces of the decoupling element 25 can be rounded.
  • a pivotable or tiltable connection is created for tolerance compensation. If there is an offset between the fuel injection valve 1 and the receiving bore 20 within the scope of the tolerated production fluctuations, the fuel injection valve 1 may be slightly skewed. The pivotable connection between the fuel injection valve 1 and the decoupling element 25 then largely prevents lateral forces when the fuel injection valve 1 is tilted.
  • FIG. 6 and 7 An alternative embodiment of a locking ring 29 according to the invention is shown, wherein Figure 6 shows the installation situation and Figure 7 the locking ring 29 as a single component in an oblique plan view.
  • This embodiment of the locking ring 29 also represents a compact, solid, closed plastic ring.
  • This variant of the locking ring 29 advantageously offers the possibility of non-directional assembly in the production plant of the fuel injector 1.
  • the locking ring 29 In the in the Figures 4 and 5 In the embodiment shown, the locking ring 29 must be fed in a directed manner in the assembly line due to its prepositioning chamfer designed as an inclined region 32, which results in a certain susceptibility to errors.
  • the locking ring 29 is designed quasi symmetrically on its top and bottom. It is therefore irrelevant in which position the circlip 29 is mounted on the fuel injector 1. It behaves the same in both installation directions with regard to installation and function. Similar to the ring collar-like centering region 34 of the first exemplary embodiment, web-section-shaped web regions 42 protrude upward and downward from the base body of the securing ring 29, of which e.g. six spaced apart are formed over the entire ring.
  • the locking ring 29 is only quasi-symmetrical on the top and bottom, since the interrupted web areas 42, which have a slightly trapezoidal cross-section, e.g. are arranged offset by 30 Ā° so that the gaps between the web areas 42 on one side are always opposite web areas 42 on the other side. Such a shape has advantages in terms of strength as well as injection molding.

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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)
  • Fuel-Injection Apparatus (AREA)

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einer Brennstoffeinspritzvorrichtung nach der Gattung des Hauptanspruchs.The invention relates to a fuel injection device according to the preamble of the main claim.

In der Figur 1 ist beispielhaft eine aus dem Stand der Technik bekannte Brennstoffeinspritzvorrichtung gezeigt, bei der an einem in einer Aufnahmebohrung eines Zylinderkopfes einer Brennkraftmaschine eingebauten Brennstoffeinspritzventil ein flaches Zwischenelement vorgesehen ist. In bekannter Weise werden solche Zwischenelemente als AbstĆ¼tzelemente in Form einer Unterlegscheibe auf einer Schulter der Aufnahmebohrung des Zylinderkopfes abgelegt. Mit Hilfe solcher Zwischenelemente werden Fertigungs- und Montagetoleranzen ausgeglichen und eine querkraftfreie Lagerung auch bei leichter Schiefstellung des Brennstoffeinspritzventils sichergestellt. Die Brennstoffeinspritzvorrichtung eignet sich besonders fĆ¼r den Einsatz in Brennstoffeinspritzanlagen von gemischverdichtenden fremdgezĆ¼ndeten Brennkraftmaschinen.In the Figure 1 a fuel injection device known from the prior art is shown by way of example, in which a flat intermediate element is provided on a fuel injection valve installed in a receiving bore of a cylinder head of an internal combustion engine. In a known manner, such intermediate elements are deposited as support elements in the form of a washer on a shoulder of the receiving bore of the cylinder head. With the help of such intermediate elements, manufacturing and assembly tolerances are compensated for and a lateral force-free bearing is ensured even when the fuel injector is slightly inclined. The fuel injection device is particularly suitable for use in fuel injection systems of mixed-compression spark-ignition internal combustion engines.

Eine andere Art eines einfachen Zwischenelements fĆ¼r eine Brennstoffeinspritzvorrichtung ist bereits aus der DE 101 08 466 A1 bekannt. Bei dem Zwischenelement handelt es ich um einen Unterlegring mit einem kreisfƶrmigen Querschnitt, der in einem Bereich, in dem sowohl das Brennstoffeinspritzventil als auch die Wandung der Aufnahmebohrung im Zylinderkopf kegelstumpffƶrmig verlaufen, angeordnet ist und als Ausgleichselement zur Lagerung und StĆ¼tzung des Brennstoffeinspritzventils dient.Another type of simple intermediate element for a fuel injector is already known from the DE 101 08 466 A1 known. The intermediate element is a washer with a circular cross-section, which is arranged in an area in which both the fuel injector and the wall of the mounting hole in the cylinder head run in the shape of a truncated cone, and serves as a compensating element for mounting and supporting the fuel injector.

Kompliziertere und in der Herstellung deutlich aufwƤndigere Zwischenelemente fĆ¼r Brennstoffeinspritzvorrichtungen sind u.a. auch aus den DE 100 27 662 A1 ,
DE 100 38 763 A1 und EP 1 223 337 A1 bekannt. Diese Zwischenelemente zeichnen sich dadurch aus, dass sie allesamt mehrteilig bzw. mehrlagig aufgebaut sind und z.T. Dicht- und DƤmpfungsfunktionen Ć¼bernehmen sollen. Das aus der
DE 100 27 662 A1 bekannte Zwischenelement umfasst einen Grund- und TrƤgerkƶrper, in dem ein Dichtmittel eingesetzt ist, das von einem DĆ¼senkƶrper des Brennstoffeinspritzventils durchgriffen wird. Aus der DE 100 38 763 A1 ist ein mehrlagiges Ausgleichselement bekannt, das sich aus zwei starren Ringen und einem sandwichartig dazwischen angeordneten elastischen Zwischenring zusammensetzt. Dieses Ausgleichselement ermƶglicht sowohl ein Verkippen des Brennstoffeinspritzventils zur Achse der Aufnahmebohrung Ć¼ber einen relativ groƟen Winkelbereich als auch ein radiales Verschieben des Brennstoffeinspritzventils aus der Mittelachse der Aufnahmebohrung.Intermediate elements for fuel injection devices, which are more complicated and much more complex to manufacture, are also known from DE 100 27 662 A1 ,
DE 100 38 763 A1 and EP 1 223 337 A1 known. These intermediate elements are characterized by the fact that they are all made up of several parts or several layers, and some of them are supposed to perform sealing and damping functions. That from the
DE 100 27 662 A1 Known intermediate element comprises a base and carrier body, in which a sealant is used, which is penetrated by a nozzle body of the fuel injector. From the DE 100 38 763 A1 a multilayer compensation element is known, which is composed of two rigid rings and an elastic intermediate ring arranged between them in a sandwich-like manner. This compensating element enables both the tilting of the fuel injector to the axis of the receiving bore over a relatively large angular range and also a radial displacement of the fuel injector from the central axis of the receiving bore.

Ein ebenfalls mehrlagiges Zwischenelement ist auch aus der EP 1 223 337 A1 bekannt, wobei dieses Zwischenelement aus mehreren Unterlegscheiben zusammengesetzt ist, die aus einem DƤmpfungsmaterial bestehen. Das DƤmpfungsmaterial aus Metall, Gummi oder PTFE ist dabei so gewƤhlt und ausgelegt, dass eine GerƤuschdƤmpfung der durch den Betrieb des Brennstoffeinspritzventils erzeugten Vibrationen und GerƤusche ermƶglicht wird. Das Zwischenelement muss dazu jedoch vier bis sechs Lagen umfassen, um einen gewĆ¼nschten DƤmpfungseffekt zu erzielen.A multilayer intermediate element is also from the EP 1 223 337 A1 known, this intermediate element is composed of several washers, which consist of a damping material. The damping material made of metal, rubber or PTFE is selected and designed in such a way that noise dampening of the vibrations and noises generated by the operation of the fuel injector is made possible. However, the intermediate element must comprise four to six layers in order to achieve a desired damping effect.

Zur Reduzierung von GerƤuschemissionen schlƤgt die US 6,009,856 A zudem vor, das Brennstoffeinspritzventil mit einer HĆ¼lse zu umgeben und den entstehenden Zwischenraum mit einer elastischen, gerƤuschdƤmpfenden Masse auszufĆ¼llen. Diese Art der GerƤuschdƤmpfung ist allerdings sehr aufwƤndig, montageunfreundlich und kostspielig.To reduce noise emissions, the US 6,009,856 A also propose to surround the fuel injector with a sleeve and to fill the resulting space with an elastic, noise-damping compound. However, this type of noise reduction is very complex, unfriendly to assemble and expensive.

Aus der DE 198 07 819 C1 ist bereits eine Brennstoffeinspritzvorrichtung fĆ¼r Brennstoffeinspritzanlagen von Brennkraftmaschinen, insbesondere zum direkten Einspritzen von Brennstoff in einen Brennraum, bekannt. Die Brennstoffeinspritzvorrichtung umfasst wenigstens ein Brennstoffeinspritzventil und eine Aufnahmebohrung fĆ¼r das Brennstoffeinspritzventil. AuƟerdem ist ein Dichtelement zwischen einem VentilgehƤuse des Brennstoffeinspritzventils und einer Wandung der Aufnahmebohrung eingebracht. Das Dichtelement ist dabei verliergesichert am Brennstoffeinspritzventil angeordnet, indem ein sichernder O-Ring unterhalb des Dichtelements am AuƟenumfang des Brennstoffeinspritzventils aufgebracht ist. Der O-Ring ist ein geschlossener Ring aus einem Kautschuk wie Perbunan, der sich wƤhrend des Betriebs der Brennkraftmaschine auflƶst.From the DE 198 07 819 C1 a fuel injection device for fuel injection systems of internal combustion engines, in particular for the direct injection of fuel into a combustion chamber, is already known. The fuel injection device comprises at least one fuel injection valve and a receiving bore for the fuel injection valve. In addition, a sealing element is introduced between a valve housing of the fuel injection valve and a wall of the receiving bore. The sealing element is arranged on the fuel injector in such a way that it is secured against loss, in that a securing O-ring is applied below the sealing element on the outer circumference of the fuel injector. The O-ring is a closed ring made of a rubber such as Perbunan, which dissolves during the operation of the internal combustion engine.

Auch aus der DE 42 40 514 A1 ist bereits eine Brennstoffeinspritzvorrichtung bekannt, die wenigstens ein Brennstoffeinspritzventil und eine Aufnahmebohrung fĆ¼r das Brennstoffeinspritzventil umfasst und bei der eine Dichtscheibe zwischen einem VentilgehƤuse des Brennstoffeinspritzventils und einer Wandung der Aufnahmebohrung eingebracht und von einem vorgespannten Elastomerring am Brennstoffeinspritzventil fixiert ist.Also from the DE 42 40 514 A1 a fuel injection device is already known which comprises at least one fuel injection valve and a receiving bore for the fuel injection valve and in which a sealing washer is introduced between a valve housing of the fuel injection valve and a wall of the receiving bore and is fixed to the fuel injection valve by a prestressed elastomer ring.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemƤƟe Brennstoffeinspritzvorrichtung mit den kennzeichnenden Merkmalen des Anspruchs 1 hat den Vorteil, dass sehr einfach und kostengĆ¼nstig eine Verliersicherung fĆ¼r das Entkopplungselement auf dem Brennstoffeinspritzventil aufbringbar ist, wodurch ein Abrutschen des Entkopplungselements vor der Montage des Brennstoffeinspritzventils in der Aufnahmebohrung ausgeschlossen ist. Die Verliersicherung wird erfindungsgemƤƟ von einem kompakten, massiven und trotzdem filigranen Sicherungsring Ć¼bernommen, der unterhalb des Entkopplungselements am AuƟenumfang des Brennstoffeinspritzventils angeordnet ist.The fuel injection device according to the invention with the characterizing features of claim 1 has the advantage that it is very simple and inexpensive to apply a loss protection for the decoupling element on the fuel injection valve, as a result of which the decoupling element cannot slip before the fuel injection valve is installed in the receiving bore. The securing against loss is taken over according to the invention by a compact, massive and nevertheless filigree locking ring which is arranged below the decoupling element on the outer circumference of the fuel injection valve.

Der Sicherungsring zeichnet sich trotz seiner sehr einfachen und leicht herstellbaren Geometrie und Konturgebung durch eine besonders hohe Funktionsintegration aus, da an dem ein massives Bauelement darstellenden Sicherungsring in verschiedene Richtungen abstehende Funktionsbereiche ausgeformt sind, die dem Halten, Sichern, Zentrieren, Vorpositionieren und dem beschƤdigungsfreien EinfĆ¼hren und Aufbringen dienen.In spite of its very simple and easy-to-produce geometry and contouring, the retaining ring is characterized by a particularly high level of functional integration, since the retaining ring, which is a solid component, is formed with functional areas that protrude in different directions, which hold, secure, center, preposition and insert without damage and serving.

Durch die in den UnteransprĆ¼chen aufgefĆ¼hrten MaƟnahmen sind vorteilhafte Weiterbildungen und Verbesserungen der im Anspruch 1 angegebenen Brennstoffeinspritzvorrichtung mƶglich.Advantageous further developments and improvements of the fuel injection device specified in claim 1 are possible through the measures listed in the subclaims.

Das Entkopplungselement zeichnet sich durch eine geringe Bauhƶhe aus, wodurch es auch bei kleinem Bauraum einsetzbar ist. Das Entkopplungselement besitzt zudem eine groƟe Dauerfestigkeit auch bei hohen Temperaturen. Das Entkopplungselement ist fertigungstechnisch sehr einfach und kostengĆ¼nstig herstellbar. Die gesamte AufhƤngung des Systems aus Brennstoffeinspritzventil und Entkopplungselement kann zudem einfach und schnell moniert bzw. demontiert werden.The decoupling element is characterized by a low overall height, which means that it can also be used in a small installation space. The decoupling element also has great fatigue strength even at high temperatures. The decoupling element is very simple and inexpensive to manufacture. The entire suspension of the system consisting of fuel injector and decoupling element can also be easily and quickly assembled or disassembled.

Zeichnungdrawing

AusfĆ¼hrungsbeispiele der Erfindung sind in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung nƤher erlƤutert. Es zeigen

Figur 1
eine teilweise dargestellte Brennstoffeinspritzvorrichtung in einer bekannten AusfĆ¼hrung mit einem scheibenfƶrmigen Zwischenelement,
Figur 2
ein mechanisches Ersatzschaltbild der AbstĆ¼tzung des Brennstoffeinspritzventils im Zylinderkopf bei der Kraftstoffdirekteinspritzung, das ein gewƶhnliches Feder-Masse-DƤmpfer-System wiedergibt,
Figur 3
das Ɯbertragungsverhalten eines in Figur 2 gezeigten Feder-Masse-DƤmpfer-Systems mit einer VerstƤrkung bei niedrigen Frequenzen im Bereich der Resonanzfrequenz fR und einem Isolationsbereich oberhalb der Entkoppelfrequenz fE,
Figur 4
einen Querschnitt durch eine erfindungsgemƤƟe Brennstoffeinspritzvorrichtung in einer Einbausituation an einem Brennstoffeinspritzventil im Bereich des in Figur 1 gezeigten scheibenfƶrmigen Zwischenelements,
Figur 5
eine Detailansicht V aus Figur 4 und
Figuren 6 und 7
eine alternative AusfĆ¼hrung eines erfindungsgemƤƟen Sicherungsrings, wobei Figur 6 die Einbausituation in einer Ansicht analog Figur 5 zeigt und Figur 7 den Sicherungsring als Einzelbauteil in einer schrƤgen Draufsicht zeigt.
Embodiments of the invention are shown in simplified form in the drawing and explained in more detail in the following description. Show it
Figure 1
a partially illustrated fuel injection device in a known embodiment with a disc-shaped intermediate element,
Figure 2
a mechanical equivalent circuit diagram of the support of the fuel injector in the cylinder head during direct fuel injection, which represents a conventional spring-mass damper system,
Figure 3
the transmission behavior of an in Figure 2 spring-mass-damper system shown with a gain at low frequencies in the range of the resonance frequency f R and an isolation area above the decoupling frequency f E ,
Figure 4
a cross section through a fuel injection device according to the invention in an installation situation on a fuel injection valve in the area of the in Figure 1 disc-shaped intermediate element shown,
Figure 5
a detailed view V from Figure 4 and
Figures 6 and 7
an alternative embodiment of a circlip according to the invention, in which Figure 6 the installation situation in a view analogous Figure 5 shows and Figure 7 shows the locking ring as a single component in an oblique plan view.

Beschreibung der AusfĆ¼hrungsbeispieleDescription of the embodiments

Zum VerstƤndnis der Erfindung wird im Folgenden anhand der Figur 1 eine bekannte AusfĆ¼hrungsform einer Brennstoffeinspritzvorrichtung nƤher beschrieben. In der Figur 1 ist als ein AusfĆ¼hrungsbeispiel ein Ventil in der Form eines Einspritzventils 1 fĆ¼r Brennstoffeinspritzanlagen von gemischverdichtenden fremdgezĆ¼ndeten Brennkraftmaschinen in einer Seitenansicht dargestellt. Das Brennstoffeinspritzventil 1 ist Teil der Brennstoffeinspritzvorrichtung. Mit einem stromabwƤrtigen Ende ist das Brennstoffeinspritzventil 1, das in Form eines direkt einspritzenden Einspritzventils zum direkten Einspritzen von Brennstoff in einen Brennraum 25 der Brennkraftmaschine ausgefĆ¼hrt ist, in eine Aufnahmebohrung 20 eines Zylinderkopfes 9 eingebaut. Ein Dichtring 2, insbesondere aus Teflonā„¢, sorgt fĆ¼r eine optimale Abdichtung des Brennstoffeinspritzventils 1 gegenĆ¼ber der Wandung der Aufnahmebohrung 20 des Zylinderkopfes 9.To understand the invention, the following is based on the Figure 1 a known embodiment of a fuel injection device described in more detail. In the Figure 1 As an exemplary embodiment, a valve in the form of an injection valve 1 for fuel injection systems of mixed-compression spark-ignition internal combustion engines is shown in a side view. The fuel injection valve 1 is part of the fuel injection device. With a downstream end, the fuel injection valve 1, which is designed in the form of a direct injection fuel injector for the direct injection of fuel into a combustion chamber 25 of the internal combustion engine, is installed in a receiving bore 20 of a cylinder head 9. A sealing ring 2, in particular made of Teflon ā„¢, ensures an optimal seal of the fuel injection valve 1 with respect to the wall of the receiving bore 20 of the cylinder head 9.

Zwischen einem Absatz 21 eines VentilgehƤuses 22 und einer z.B. rechtwinklig zur LƤngserstreckung der Aufnahmebohrung 20 verlaufenden Schulter 23 der Aufnahmebohrung 20 ist ein flaches Zwischenelement 24 eingelegt, das als AbstĆ¼tzelement in Form einer Unterlegscheibe ausgefĆ¼hrt ist. Mit Hilfe eines solchen Zwischenelements 24 werden Fertigungs- und Montagetoleranzen ausgeglichen und eine querkraftfreie Lagerung auch bei leichter Schiefstellung des Brennstoffeinspritzventils 1 sichergestellt.Between a shoulder 21 of a valve housing 22 and a e.g. A flat intermediate element 24, which is designed as a support element in the form of a washer, is inserted at right angles to the longitudinal extension of the receiving bore 20 shoulder 23 of the receiving bore 20. With the help of such an intermediate element 24, manufacturing and assembly tolerances are compensated for and a lateral force-free mounting is ensured even when the fuel injector 1 is slightly skewed.

Das Brennstoffeinspritzventil 1 weist an seinem zulaufseitigen Ende 3 eine Steckverbindung zu einer Brennstoffverteilerleitung (Fuel Rail) 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 ist in eine Aufnahmeƶffnung 12 des Anschlussstutzens 6 der Brennstoffverteilerleitung 4 eingeschoben. Der Anschlussstutzen 6 geht dabei z.B. einteilig aus der eigentlichen Brennstoffverteilerleitung 4 hervor und besitzt stromaufwƤrts der Aufnahmeƶffnung 12 eine durchmesserkleinere Strƶmungsƶffnung 15, Ć¼ber die die Anstrƶmung des Brennstoffeinspritzventils 1 erfolgt. Das Brennstoffeinspritzventil 1 verfĆ¼gt Ć¼ber einen elektrischen Anschlussstecker 8 fĆ¼r die elektrische Kontaktierung zur BetƤtigung des Brennstoffeinspritzventils 1.The fuel injection valve 1 has at its inlet end 3 a plug connection to a fuel rail 4, which is sealed by a sealing ring 5 between a connecting piece 6 of the fuel rail 4, which is shown in section, and an inlet nozzle 7 of the fuel injector 1. The fuel injection valve 1 is inserted into a receiving opening 12 of the connecting piece 6 of the fuel distributor line 4. The connecting piece 6 emerges, for example, in one piece from the actual fuel distributor line 4 and has, upstream of the receiving opening 12, a smaller-diameter flow opening 15, via which the flow to the fuel injection valve 1 takes place. The fuel injector 1 has via an electrical connector 8 for the electrical contact for actuating the fuel injector 1.

Um das Brennstoffeinspritzventil 1 und die Brennstoffverteilerleitung 4 weitgehend radialkraftfrei voneinander zu beabstanden und das Brennstoffeinspritzventil 1 sicher in der Aufnahmebohrung des Zylinderkopfes niederzuhalten, ist ein Niederhalter 10 zwischen dem Brennstoffeinspritzventil 1 und dem Anschlussstutzen 6 vorgesehen. Der Niederhalter 10 ist als bĆ¼gelfƶrmiges Bauteil ausgefĆ¼hrt, z.B. als Stanz-Biege-Teil. Der Niederhalter 10 weist ein teilringfƶrmiges Grundelement 11 auf, von dem aus abgebogen ein NiederhaltebĆ¼gel 13 verlƤuft, der an einer stromabwƤrtigen EndflƤche 14 des Anschlussstutzens 6 an der Brennstoffverteilerleitung 4 im eingebauten Zustand anliegt.In order to space the fuel injector 1 and the fuel distributor line 4 from one another largely without radial force and to hold the fuel injector 1 securely in the receiving bore of the cylinder head, a hold-down device 10 is provided between the fuel injector 1 and the connecting piece 6. The hold-down device 10 is designed as a bow-shaped component, e.g. as a stamped and bent part. The hold-down device 10 has a partially ring-shaped base element 11, from which a hold-down bracket 13 extends, which bears against a downstream end face 14 of the connecting piece 6 on the fuel distributor line 4 in the installed state.

GegenĆ¼ber den bekannten Zwischenelementelƶsungen soll einerseits auf einfache Art und Weise eine verbesserte GerƤuschdƤmpfung, vor allen Dingen im gerƤuschkritischen Leerlaufbetrieb, durch eine gezielte Auslegung und Geometrie des Zwischenelements 24 erreicht werden, und andererseits soll einfach und kostengĆ¼nstig ein Toleranzausgleich, der ein Verkippen des Brennstoffeinspritzventils um bis zu 1Ā° erlaubt, und ein querkraftfreier Betrieb unter Temperatureinfluss ermƶglicht sein. Die maƟgebliche GerƤuschquelle des Brennstoffeinspritzventils 1 bei der direkten Hochdruckeinspritzung sind die wƤhrend des Ventilbetriebs in den Zylinderkopf 9 eingeleiteten KrƤfte (Kƶrperschall), die zu einer strukturellen Anregung des Zylinderkopfs 9 fĆ¼hren und von diesem als Luftschall abgestrahlt werden. Um eine GerƤuschverbesserung zu erreichen, ist daher eine Minimierung der in den Zylinderkopf 9 eingeleiteten KrƤfte anzustreben. Neben der Verringerung der durch die Einspritzung verursachten KrƤfte kann dies durch eine Beeinflussung des Ɯbertragungsverhaltens zwischen dem Brennstoffeinspritzventil 1 und dem Zylinderkopf 9 erreicht werden.Compared to the known intermediate element solutions, on the one hand, improved noise damping, above all in noise-critical idle operation, is to be achieved in a simple manner by means of a specific design and geometry of the intermediate element 24, and on the other hand, tolerance compensation that tilts the fuel injector by up to should be simple and inexpensive allowed to 1 Ā°, and a shear force-free operation under the influence of temperature. The decisive noise source of the fuel injection valve 1 in direct high-pressure injection are the forces (structure-borne noise) introduced into the cylinder head 9 during valve operation, which lead to a structural excitation of the cylinder head 9 and are emitted by the latter as airborne noise. In order to improve the noise, the forces introduced into the cylinder head 9 should therefore be minimized. In addition to reducing the forces caused by the injection, this can be achieved by influencing the transmission behavior between the fuel injection valve 1 and the cylinder head 9.

Im mechanischen Sinne kann die Lagerung des Brennstoffeinspritzventils 1 auf dem passiven Zwischenelement 24 in der Aufnahmebohrung 20 des Zylinderkopfes 9 als ein gewƶhnliches Feder-Masse-DƤmpfer-System abgebildet werden, wie dies in Figur 2 dargestellt ist. Die Masse M des Zylinderkopfs 9 kann dabei gegenĆ¼ber der Masse m des Brennstoffeinspritzventils 1 in erster NƤherung als unendlich groƟ angenommen werden. Das Ɯbertragungsverhalten eines solchen Systems zeichnet sich durch eine VerstƤrkung bei niedrigen Frequenzen im Bereich der Resonanzfrequenz fR und einen Isolationsbereich oberhalb der Entkoppelfrequenz fE aus (siehe Figur 3).In the mechanical sense, the mounting of the fuel injection valve 1 on the passive intermediate element 24 in the receiving bore 20 of the cylinder head 9 can be represented as a conventional spring-mass damper system, as shown in FIG Figure 2 is shown. The mass M of the cylinder head 9 can be assumed to be infinitely large compared to the mass m of the fuel injector 1. The transmission behavior of such a system is characterized by an amplification at low frequencies in the range of the resonance frequency f R and an isolation range above the decoupling frequency f E (see Figure 3 ).

Die Entkopplung des Brennstoffeinspritzventils 1 vom Zylinderkopf 9 mit Hilfe einer geringen Federsteifigkeit c des Entkopplungselements 25, das ringfƶrmig, insbesondere als geschlossener Ring, und im Querschnitt polsterartig ausgefĆ¼hrt ist, wird neben dem geringen Bauraum durch eine EinschrƤnkung der zulƤssigen axialen Maximalbewegung des Brennstoffeinspritzventils 1 wƤhrend des Motorbetriebs erschwert. Im Fahrzeug treten typischerweise folgende quasi-statische LastzustƤnde auf:

  1. 1. die nach der Montage durch einen Niederhalter 10 aufgebrachte statische Niederhaltekraft FNH,
  2. 2. die bei Leerlauf-Betriebsdruck vorliegende Kraft FL und
  3. 3. die bei nominalem Systemdruck vorliegende Kraft FSys.
The decoupling of the fuel injector 1 from the cylinder head 9 with the aid of a low spring stiffness c of the decoupling element 25, which is ring-shaped, in particular as a closed ring, and has a cushion-like cross section, is achieved in addition to the small installation space by restricting the permissible maximum axial movement of the fuel injector 1 during the Engine operation difficult. The following quasi-static load conditions typically occur in the vehicle:
  1. 1. the static hold-down force F NH applied after assembly by a hold-down device 10,
  2. 2. the force F L and at idle operating pressure
  3. 3. the force F Sys present at nominal system pressure.

Um die gerƤuschentkoppelnden MaƟnahmen bei typischen Randbedingungen der Kraftstoffdirekteinspritzung (geringer Bauraum, groƟe KrƤfte, geringe axiale Gesamtbewegung des Brennstoffeinspritzventils 1) auf einfache und kostengĆ¼nstige Weise umsetzen zu kƶnnen, ist das Entkopplungselement 25 mit seinem polsterartigen Querschnitt Ć¼ber seinen ringfƶrmigen Verlauf weiterhin so gestaltet, dass eine untere, z.B. weitgehend ebene StirnflƤche 26 vorgesehen ist, die auf einer Schulter 23 der Aufnahmebohrung 20 im Zylinderkopf 9 aufliegt, und eine obere StirnflƤche 27 vorgesehen ist, die von radial auƟen nach radial innen konisch ansteigend verlƤuft und Anlagekontakt mit einer sphƤrisch gewƶlbten SchulterflƤche 21 des VentilgehƤuses 22 des Brennstoffeinspritzventils 1 hat.In order to be able to implement the noise-decoupling measures under typical boundary conditions of direct fuel injection (small installation space, large forces, low total axial movement of the fuel injection valve 1) in a simple and inexpensive manner, the decoupling element 25 with its cushion-like cross-section is further designed over its annular course so that a lower, e.g. largely flat end face 26 is provided, which rests on a shoulder 23 of the receiving bore 20 in the cylinder head 9, and an upper end face 27 is provided which rises conically from radially outside to radially inside and makes contact with a spherically curved shoulder surface 21 of the valve housing 22 of the Has fuel injector 1.

In der Figur 4 ist ein Querschnitt durch ein Entkopplungselement 25 in einer Einbausituation an einem Brennstoffeinspritzventil 1 im Bereich des in Figur 1 gezeigten scheibenfƶrmigen Zwischenelements 24 dargestellt, wobei das Zwischenelement 24 durch das Entkopplungselement 25 ersetzt ist.In the Figure 4 is a cross section through a decoupling element 25 in an installation situation on a fuel injection valve 1 in the area of the in Figure 1 shown disc-shaped intermediate element 24, wherein the intermediate element 24 is replaced by the decoupling element 25.

ErfindungsgemƤƟ ist das Entkopplungselement 25 verliergesichert am Brennstoffeinspritzventil 1 angeordnet, indem ein Sicherungsring 29 unterhalb des Entkopplungselements 25 am AuƟenumfang des Brennstoffeinspritzventils 1 aufgebracht ist. Der Sicherungsring 29 stellt dabei einen geschlossenen Kunststoffring dar. Der Sicherungsring 29 zeichnet sich als ein massives Bauelement aus, das klein und kompakt ausgefĆ¼hrt ist und das in verschiedene Richtungen abstehende Funktionsbereiche aufweist. Das Entkopplungselement 25 muss verliersicher am Brennstoffeinspritzventil 1 befestigt werden, um eine gemeinsame Montage und Demontage von Brennstoffeinspritzventil 1 und Entkopplungselement 25 beim OEM in den Zylinderkopf 9 der Brennkraftmaschine zu ermƶglichen. Auf diese Weise muss der OEM nur eine Gesamtbaugruppe handhaben.According to the invention, the decoupling element 25 is arranged on the fuel injection valve 1 in such a way that it is secured against loss, in that a securing ring 29 is applied below the decoupling element 25 on the outer circumference of the fuel injection valve 1. The locking ring 29 represents a closed plastic ring. The locking ring 29 is characterized as a solid component that is small and compact and has functional areas that protrude in different directions. The decoupling element 25 must be securely attached to the fuel injector 1 in order to enable the fuel injector 1 and the decoupling element 25 to be assembled and disassembled at the OEM in the cylinder head 9 of the internal combustion engine. In this way, the OEM only has to handle one complete assembly.

In einer vergrĆ¶ĆŸerten Detailansicht sind in der Figur 5 das Entkopplungselement 25 und der Sicherungsring 29 als Ausschnitt V der Figur 4 gezeigt. Der radial am weitesten nach innen stehende Funktionsbereich ist ein Halteebereich 30, der mit einer am VentilgehƤuse 22 eingebrachten Nut 31 korrespondiert. Ausgehend vom Haltebereich 30 erstreckt sich ein in Richtung zum Entkopplungselement 25 zeigender SchrƤgbereich 32 mit einer EinfĆ¼hrschrƤge, der eine Vorpositionierfunktion erfĆ¼llen soll. Der radial am weitesten nach auƟen stehende Funktionsbereich ist ein Sicherungsbereich 33, der radial soweit das Entkopplungselement 25 (mit einem zumindest im eingebauten Zustand geringen axialen Abstand) untergreift, dass ein Abrutschen des Entkopplungselements 25 vom Brennstoffeinspritzventil 1 vor dessen Einbau in der Aufnahmebohrung 20 ausgeschlossen ist. Ein nach unten abstehendender Funktionsbereich ist ein Zentrierbereich 34, der ringkragenartig ausgefĆ¼hrt ist und mit einer Spielpassung an dem VentilgehƤuse 22 anliegt.In an enlarged detail view are in the Figure 5 the decoupling element 25 and the locking ring 29 as a section V of Figure 4 shown. The radially furthest inward functional area is a holding area 30, which corresponds to a groove 31 made in the valve housing 22. Starting from the holding area 30, an inclined area 32 pointing in the direction of the decoupling element 25 extends with an insertion bevel, which is intended to perform a pre-positioning function. The radially outermost functional area is a securing area 33, which engages radially under the decoupling element 25 (with a small axial distance, at least in the installed state), so that the decoupling element 25 cannot slip off the fuel injector 1 before it is installed in the receiving bore 20 . A downwardly projecting functional area is a centering area 34, which is designed like a ring collar and bears against the valve housing 22 with a clearance fit.

ErfindungsgemƤƟ ist der Sicherungsring 29 genauso kompakt und in seinen AuƟenabmessungen gestaltet, dass im Auslenkungs-/Verkippungsfall des Brennstoffeinspritzventils 1 kein Kontakt zwischen der Wandung der Aufnahmebohrung 20 des Zylinderkopfes 9 und dem Sicherungsring 29 entsteht. Dies wĆ¼rde wieder zu einem Querkrafteintrag auf das Brennstoffeinspritzventil 1 und somit zur unerwĆ¼nschten Biegung fĆ¼hren. AuƟerdem wƤre ein sicheres Halten des Sicherungsrings 29 am Brennstoffeinspritzventil 1 Ć¼ber die gesamte Lebensdauer nicht mehr gewƤhrleistet.According to the invention, the locking ring 29 is just as compact and its outer dimensions are such that, in the event of the fuel injection valve 1 being deflected / tilted, there is no contact between the wall of the receiving bore 20 of the cylinder head 9 and the locking ring 29. This would again lead to a lateral force input on the fuel injection valve 1 and thus to an undesirable bend. In addition, a secure holding of the locking ring 29 on the fuel injector 1 would no longer be guaranteed over the entire service life.

Der Sicherungsring 29 aus Kunststoff wird vor seiner Montage auf dem Brennstoffeinspritzventil 1 konditioniert. Dabei wird der Kunststoff gezielt mit z.B. Wasser zum Aufquellen angereichert. Hierdurch erhƶht sich seine Dehnbarkeit, ohne dass Risse o.Ƥ. im GefĆ¼ge des Kunststoffs entstehen. AnschlieƟend wird der Sicherungsring 29 Ć¼ber einen Bund 37 am VentilgehƤuse 22 gedehnt. Die dabei entstehende Belastung ist aufgrund des speziell konditionierten Zustands fĆ¼r den Sicherungsring 29 vertrƤglich. Um dem Montageprozess sicher und zuverlƤssig durchfĆ¼hren zu kƶnnen, besitzt das Brennstoffeinspritzventil 1 an seinem Bund 37 eine EinfĆ¼hrschrƤge von z.B. 30Ā°. Ein Ć¼ber der EinfĆ¼hrschrƤge vorgesehener kurzer zylindrischer Abschnitt am Bund 37 hilft dabei, ein UmstĆ¼lpen des Sicherungsringes 29 beim Montieren sicher zu unterbinden. Um ein radiales Vorpositionieren des Sicherungsringes 29 zu ermƶglichen, ist der Sicherungsring mit dem SchrƤgbereich 32 ausgestattet, der eine EinfĆ¼hrschrƤge von z.B. 45Ā° besitzt. Die am VentilgehƤuse 22 eingebrachte Nut 31 sorgt dafĆ¼r, dass der dem SchrƤgbereich 32 folgende Haltebereich 30 gefangen wird, so dass verhindert ist, dass im eingebauten Zustand kein Kontakt oder ein Sitz "auf Block" an dem Entkopplungselement 25 vorliegt. Hierdurch wĆ¼rde ansonsten die Schwenkbarkeit des Brennstoffeinspritzventils 1 erheblich eingeschrƤnkt werden. Im montierten Zustand ist der Sicherungsring 29 mit Pressung in der Nut 31 ausgelegt, d.h. der maximale Innendurchmesser des Sicherungsringes 29 ist kleiner als der minimale AuƟendurchmesser des Nutgrundes am VentilgehƤuse 22. Nach der Montage der Baueinheit Brennstoffeinspritzventil 1/Entkopplungselement 25/Sicherungsring 29 in der Aufnahmebohrung 20 wird der Kunststoff seinen Feuchtigkeitsgehalt wieder auf das ursprĆ¼ngliche MaƟ abbauen, wodurch der Festsitz am Brennstoffeinspritzventil 1 nochmals erhƶht wird.The retaining ring 29 made of plastic is conditioned before it is installed on the fuel injector 1. The plastic is specifically enriched with water to swell. This increases its elasticity without tears or the like. arise in the structure of the plastic. Then the locking ring 29 is stretched over a collar 37 on the valve housing 22. The resulting load is compatible due to the specially conditioned condition for the locking ring 29. In order to be able to carry out the assembly process safely and reliably, the fuel injection valve 1 has an insertion slope of, for example, 30 Ā° on its collar 37. A short cylindrical section on the collar 37 provided above the insertion slope helps to reliably prevent the locking ring 29 from being turned over during assembly. In order to enable a radial prepositioning of the locking ring 29, the locking ring is equipped with the inclined area 32, which has an insertion bevel of, for example, 45 Ā°. The groove 31 made on the valve housing 22 ensures that the holding area 30 following the inclined area 32 is caught, so that it is prevented that none in the installed state Contact or a seat "on block" on the decoupling element 25 is present. Otherwise, the pivotability of the fuel injection valve 1 would be considerably restricted. In the assembled state, the locking ring 29 is designed with pressure in the groove 31, that is to say the maximum inner diameter of the locking ring 29 is smaller than the minimum outer diameter of the groove base on the valve housing 22. After the assembly of the fuel injector 1 / decoupling element 25 / locking ring 29 in the receiving bore 20, the plastic will reduce its moisture content back to the original level, as a result of which the tight fit on the fuel injector 1 is increased again.

In dem dargestellten AusfĆ¼hrungsbeispiel weist das Entkopplungselement 25 an seiner Oberseite die konisch bzw. kegelig verlaufende StirnflƤche 27 auf, die im eingebauten Zustand mit der ballig bzw. sphƤrisch ausgefĆ¼hrten, konvex gewƶlbten SchulterflƤche 21 des VentilgehƤuses 22 des Brennstoffeinspritzventils 1 korrespondiert. Die SchulterflƤche 21 des VentilgehƤuses 22 ist dabei an einer radial nach auƟen stehenden Schulter 28 ausgebildet. Die SchulterflƤche 21 des VentilgehƤuses 22 muss nicht durchgehend sphƤrisch gewƶlbt verlaufen; es genĆ¼gt eine solche Ausformung im Kontaktbereich mit der konisch verlaufenden StirnflƤche 27 des Entkopplungselements 25. Die jeweiligen ƜbergƤnge der oberen StirnflƤche 27 und der unteren StirnflƤche 26 zu den beiden inneren und ƤuƟeren RingmantelflƤchen des Entkopplungselements 25 kƶnnen abgerundet sein. Die Geometrie mit einem flachen Winkel bzw. einem groƟen Radius der Wƶlbung an der sphƤrisch gewƶlbten SchulterflƤche 21 des VentilgehƤuses 22 und der konisch bzw. kegelig verlaufenden StirnflƤche 27 des Entkopplungselements 25 ermƶglicht in Verbindung mit einem relativ groƟen Spiel nach radial innen zum Brennstoffeinspritzventil 1 hin und mit einem geringen Spiel nach radial auƟen zur Wandung der Aufnahmebohrung 20 hin den Einsatz eines spritzbaren Kunststoffelements oder eines kaltverformten Aluminiumelements. Ein solches Entkopplungselement 25 ist kostengĆ¼nstig zu fertigen und entkoppelt den Kƶrperschall in der gewĆ¼nschten Weise.In the exemplary embodiment shown, the decoupling element 25 has on its upper side the conical or conical end face 27, which in the installed state corresponds to the spherical or spherical, convexly curved shoulder surface 21 of the valve housing 22 of the fuel injection valve 1. The shoulder surface 21 of the valve housing 22 is formed on a radially outwardly projecting shoulder 28. The shoulder surface 21 of the valve housing 22 does not have to be spherically arched throughout; such a shape is sufficient in the contact area with the conical end face 27 of the decoupling element 25. The respective transitions of the upper end face 27 and the lower end face 26 to the two inner and outer annular jacket surfaces of the decoupling element 25 can be rounded. The geometry with a flat angle or a large radius of curvature on the spherically curved shoulder surface 21 of the valve housing 22 and the conical or tapered end surface 27 of the decoupling element 25 in conjunction with a relatively large clearance radially inward towards the fuel injection valve 1 and with a slight play radially outwards towards the wall of the receiving bore 20, the use of a sprayable plastic element or a cold-formed aluminum element. Such a decoupling element 25 is inexpensive to manufacture and decouples the structure-borne noise in the desired manner.

Zusammen mit der geringfĆ¼gig konvex gewƶlbten SchulterflƤche 21 des VentilgehƤuses 22 entsteht eine schwenkbare bzw. verkippbare Verbindung zum Toleranzausgleich. Bei Versatz zwischen dem Brennstoffeinspritzventil 1 und der Aufnahmebohrung 20 im Rahmen der tolerierten Fertigungsschwankungen kann es zu einer leichten Schiefstellung des Brennstoffeinspritzventils 1 kommen. Durch die schwenkbare Verbindung zwischen dem Brennstoffeinspritzventil 1 und dem Entkopplungselement 25 werden dann QuerkrƤfte bei einer Schiefstellung des Brennstoffeinspritzventils 1 weitgehend vermieden. Ein Ć¼ber die Schulter 23 der Aufnahmebohrung 20 in Richtung zum Sicherungsring 29 ragender und schrƤg ausgefĆ¼hrter Kragen 38 am Entkopplungselement 25 kann fĆ¼r eine noch bessere Stabilisierung des Entkopplungselements 25 im Verkippungsfall sorgen bzw. ermƶglicht die sehr kompakte AusfĆ¼hrung des Sicherungsrings 29, da das Entkopplungselement 25 im Bereich des Kragens 38 bei geringen radialen Abmessungen des Sicherungsringes 29 bereits sicher untergriffen ist.Together with the slightly convexly curved shoulder surface 21 of the valve housing 22, a pivotable or tiltable connection is created for tolerance compensation. If there is an offset between the fuel injection valve 1 and the receiving bore 20 within the scope of the tolerated production fluctuations, the fuel injection valve 1 may be slightly skewed. The pivotable connection between the fuel injection valve 1 and the decoupling element 25 then largely prevents lateral forces when the fuel injection valve 1 is tilted. One over the Shoulder 23 of the receiving bore 20 projecting and inclined collar 38 on the decoupling element 25 in the direction of the securing ring 29 can ensure an even better stabilization of the decoupling element 25 in the event of tilting or enables the very compact design of the securing ring 29, since the decoupling element 25 in the region of the collar 38 is already securely gripped with small radial dimensions of the locking ring 29.

In den Figuren 6 und 7 ist eine alternative AusfĆ¼hrung eines erfindungsgemƤƟen Sicherungsrings 29 dargestellt, wobei Figur 6 die Einbausituation zeigt und Figur 7 den Sicherungsring 29 als Einzelbauteil in einer schrƤgen Draufsicht. Auch diese AusfĆ¼hrung des Sicherungsrings 29 stellt einen kompakten, massiven, geschlossenen Kunststoffring dar. Diese Variante des Sicherungsrings 29 bietet in vorteilhafter Weise die Mƶglichkeit einer ungerichteten Montage im Fertigungswerk des Brennstoffeinspritzventils 1. Bei der in den Figuren 4 und 5 gezeigten AusfĆ¼hrung muss der Sicherungsring 29 aufgrund seiner als SchrƤgbereich 32 ausgebildeten Vorpositionierfase in gerichteter Form in der Montagelinie zugefĆ¼hrt werden, was eine gewisse FehleranfƤlligkeit mit sich fĆ¼hrt.In the Figures 6 and 7 An alternative embodiment of a locking ring 29 according to the invention is shown, wherein Figure 6 shows the installation situation and Figure 7 the locking ring 29 as a single component in an oblique plan view. This embodiment of the locking ring 29 also represents a compact, solid, closed plastic ring. This variant of the locking ring 29 advantageously offers the possibility of non-directional assembly in the production plant of the fuel injector 1. In the in the Figures 4 and 5 In the embodiment shown, the locking ring 29 must be fed in a directed manner in the assembly line due to its prepositioning chamfer designed as an inclined region 32, which results in a certain susceptibility to errors.

Der Sicherungsring 29 ist auf seiner Ober- und Unterseite quasi symmetrisch ausgefĆ¼hrt. Deshalb ist es egal, in welcher Lage der Sicherungsring 29 auf dem Brennstoffeinspritzventil 1 montiert wird. Er verhƤlt sich bezĆ¼glich Montage und Funktion in beiden Einbaurichtungen gleich. Ƅhnlich dem ringkragenartigen Zentrierbereich 34 des ersten AusfĆ¼hrungsbeispiels stehen vom Grundkƶrper des Sicherungsrings 29 nach oben und unten ringabschnittfƶrmige Stegbereiche 42 ab, von denen z.B. sechs voneinander beabstandet Ć¼ber den Gesamtring ausgeformt sind. Der Sicherungsring 29 ist dabei auf der Unter- und Oberseite nur quasi symmetrisch aufgebaut, da die unterbrochenen Stegbereiche 42, die einen leicht trapezfƶrmigen Querschnitt aufweisen, z.B. um 30Ā° versetzt angeordnet sind, so dass den LĆ¼cken zwischen den Stegbereichen 42 der einen Seite immer Stegbereiche 42 auf der anderen Seite gegenĆ¼berliegen. Eine solche Ausformung hat sowohl festigkeits- als auch spritzgusstechnische Vorteile.The locking ring 29 is designed quasi symmetrically on its top and bottom. It is therefore irrelevant in which position the circlip 29 is mounted on the fuel injector 1. It behaves the same in both installation directions with regard to installation and function. Similar to the ring collar-like centering region 34 of the first exemplary embodiment, web-section-shaped web regions 42 protrude upward and downward from the base body of the securing ring 29, of which e.g. six spaced apart are formed over the entire ring. The locking ring 29 is only quasi-symmetrical on the top and bottom, since the interrupted web areas 42, which have a slightly trapezoidal cross-section, e.g. are arranged offset by 30 Ā° so that the gaps between the web areas 42 on one side are always opposite web areas 42 on the other side. Such a shape has advantages in terms of strength as well as injection molding.

Claims (12)

  1. Fuel injection device for fuel injection systems of internal combustion engines, in particular for direct injection of fuel into a combustion chamber, wherein the fuel injection device comprises at least one fuel injection valve (1) and a receiving bore (20) for the fuel injection valve (1), and a decoupling element (25) is introduced between a valve housing (22) of the fuel injection valve (1) and a wall of the receiving bore (20),
    wherein the decoupling element (25) is captively arranged on the fuel injection valve (1) in that a securing ring (29) is mounted on the outer circumference of the fuel injection valve (1) below the decoupling element (25) and the securing ring (29) is a closed plastic ring, characterized
    in that the securing ring (29) constitutes a solid structural element which has functional regions which project in different directions.
  2. Fuel injection device according to Claim 1,
    characterized
    in that the functional region which projects furthest inwards radially is a holding region (30), which corresponds to a groove (31) formed on the valve housing (22) .
  3. Fuel injection device according to Claim 2,
    characterized
    in that provision is made of an inclined region (32), which, from the holding region (30), points in the direction of the decoupling element (25) and which has an insertion bevel for pre-positioning.
  4. Fuel injection device according to one of Claims 1 to 3,
    characterized
    in that the functional region which projects furthest outwards radially is a securing region (33), which engages below the decoupling element (25) radially to such an extent that a situation in which, prior to being fitted in the receiving bore (20), the decoupling element (25) slips off from the fuel injection valve (1) is ruled out.
  5. Fuel injection device according to one of Claims 1 to 4,
    characterized
    in that a functional region projecting downwards is a centring region (34), which is of annular collar-like form.
  6. Fuel injection device according to Claim 1 or 2,
    characterized
    in that the securing ring (29) has on its top and bottom sides in each case multiple annular section-shaped web regions (42) which are formed spaced apart from one another over the entire ring.
  7. Fuel injection device according to Claim 6,
    characterized
    in that the annular section-shaped web regions (42), in a projection into a plane, are formed offset from one another such that situated opposite the gaps between the web regions (42) on one side are always web regions (42) on the other side.
  8. Fuel injection device according to one of the preceding claims,
    characterized
    in that the decoupling element (25) is of annular form, in particular is formed as a closed ring, which has a lower end surface (26), which abuts against a shoulder (23) of the receiving bore (20), and which has an upper end surface (27), which extends so as to rise conically from radially outside to radially inside and has abutting contact with a spherically curved shoulder surface (21) of the valve housing (22) of the fuel injection valve (1) .
  9. Fuel injection device according to Claim 8,
    characterized
    in that the decoupling element (25) is an injection-moulded plastic element or a cold-worked aluminium element.
  10. Fuel injection element according to one of the preceding claims,
    characterized
    in that the decoupling element (25) is fitted such that there is relatively large play radially inwards towards the fuel injection valve (1) and very little play radially outwards towards the wall of the receiving bore (20) .
  11. Fuel injection valve according to one of the preceding claims,
    characterized
    in that the decoupling element (25), in the region of its upper, conically extending end surface (27), enters into a pivotable or tiltable connection with the fuel injection valve (1) for tolerance compensation.
  12. Fuel injection valve according to one of the preceding claims,
    characterized
    in that the receiving bore (20) for the fuel injection valve (1) is formed in a cylinder head (9), and the receiving bore (20) has a shoulder (23) which extends perpendicular to the extent of the receiving bore (20) and on which the decoupling element (25) bears.
EP15784719.5A 2014-12-16 2015-10-26 Fuel injection device Active EP3234346B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014225976.2A DE102014225976A1 (en) 2014-12-16 2014-12-16 Fuel injection device
PCT/EP2015/074702 WO2016096204A1 (en) 2014-12-16 2015-10-26 Fuel injection device

Publications (2)

Publication Number Publication Date
EP3234346A1 EP3234346A1 (en) 2017-10-25
EP3234346B1 true EP3234346B1 (en) 2020-03-18

Family

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Application Number Title Priority Date Filing Date
EP15784719.5A Active EP3234346B1 (en) 2014-12-16 2015-10-26 Fuel injection device

Country Status (7)

Country Link
US (1) US10197033B2 (en)
EP (1) EP3234346B1 (en)
JP (1) JP6553725B2 (en)
KR (1) KR102476866B1 (en)
CN (1) CN107110098B (en)
DE (1) DE102014225976A1 (en)
WO (1) WO2016096204A1 (en)

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Also Published As

Publication number Publication date
WO2016096204A1 (en) 2016-06-23
EP3234346A1 (en) 2017-10-25
JP6553725B2 (en) 2019-07-31
KR102476866B1 (en) 2022-12-14
CN107110098A (en) 2017-08-29
DE102014225976A1 (en) 2016-06-16
CN107110098B (en) 2020-05-26
US10197033B2 (en) 2019-02-05
KR20170097039A (en) 2017-08-25
US20170350358A1 (en) 2017-12-07
JP2018500500A (en) 2018-01-11

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