EP1478843A1 - Injection nozzle with a fuel filter - Google Patents

Injection nozzle with a fuel filter

Info

Publication number
EP1478843A1
EP1478843A1 EP03708080A EP03708080A EP1478843A1 EP 1478843 A1 EP1478843 A1 EP 1478843A1 EP 03708080 A EP03708080 A EP 03708080A EP 03708080 A EP03708080 A EP 03708080A EP 1478843 A1 EP1478843 A1 EP 1478843A1
Authority
EP
European Patent Office
Prior art keywords
filter
injection nozzle
bores
nozzle according
nozzle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP03708080A
Other languages
German (de)
French (fr)
Other versions
EP1478843B1 (en
Inventor
Günter Kampichler
Herbert Geier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Motorenfabrik Hatz GmbH and Co KG
Original Assignee
Motorenfabrik Hatz GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Motorenfabrik Hatz GmbH and Co KG filed Critical Motorenfabrik Hatz GmbH and Co KG
Priority to SI200330055T priority Critical patent/SI1478843T1/en
Publication of EP1478843A1 publication Critical patent/EP1478843A1/en
Application granted granted Critical
Publication of EP1478843B1 publication Critical patent/EP1478843B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/165—Filtering elements specially adapted in fuel inlets to injector

Definitions

  • the invention relates to an injection nozzle with a fuel filter for reciprocating piston internal combustion engines with a filter body in the pressure line of a holder body and nozzle holder comprising nozzle bodies.
  • fuel filters are required in order to protect the sensitive components against particle contamination of the fuel in the form of chips, detached burrs or the like. Such fuel filters thus extend the service life of the injection nozzle and ensure its trouble-free operation.
  • Known rod filters are used either in the holder body of the nozzle holder or outside the same, within the screw connections in the fuel pressure line.
  • a partition wall which is spaced apart from the wall of the pressure channel and extends in the channel direction, they enable undesired residues to be collected in a dirt space on one side of the partition wall.
  • the fuel washing around the partition in the circumferential direction reaches the pressure channel leading to the nozzle body via a clean room on the clean side of the rod filter.
  • rod filters are limited because, because of the space required, they can only be arranged at a distance from the nozzle body, and because the residues increasingly fill the dirt space, some of which get caught in the filter gaps. This leads to malfunctions that only can be remedied by replacing the rod filter or the component receiving it. Due to the strict press fit, metal particles can become detached when installing such rod filters.
  • the present invention has for its object to provide a robust and largely maintenance-free fuel filter for injection nozzles, which also manages with a relatively small filter area, so that it can be positioned as close as possible to the nozzle needle.
  • the filter surface or filter gaps are formed by bores in the filter body and filter elements arranged movably therein.
  • a dynamically acting fuel filter in which filter elements loosely arranged in the bores ensure that the residues entering the bores of the filter body are effectively hammered, ground and thus crushed by the filter elements pulsating with the flow until they become one Have reached particle size, which allows a passage through the filter gap.
  • the dynamic size reduction effect of the filter elements enables a fuel filter with a relatively small filter area to be realized, the gap dimensions of which have to be designed to match the structural design of the injection nozzle.
  • Such a dynamic fuel filter is particularly well suited for injection nozzles for direct injection engines, especially for those with seat-drilled nozzles that are equipped with the Known rod filters can no longer be adequately protected.
  • a plurality of boreholes with parallel flow can be provided, depending on the size of the filter surface to be guaranteed.
  • a plurality of filter elements can also be provided in each bore in order to improve the crushing effect in this way.
  • the filter elements are balls that form filter gaps with the walls of the bores, from which the filter surface is composed. Two or more of these balls can be arranged one behind the other in a bore. In this way, a particularly good comminution effect is achieved because several balls pulsate strongly not only in the direction of flow, but also transversely thereto, insofar as this is possible within the existing filter gaps.
  • the pressure line opens and / or opens into antechambers of the filter body, which in turn communicate with the filter surface or the filter gaps.
  • both the pressure lines on the one hand and the bores on the other hand open into antechambers on the input and / or output side of the bores, by means of which the path of movement of the filter elements or the balls in the flow direction is limited in accordance with the dimensions of these antechambers.
  • the residues present in the antechambers will work together there crushed with the adjacent preferably hardened component walls under the impact of the filter elements, which are preferably also hardened.
  • a preferred embodiment of the filter body is that it is essentially disc-shaped, so that it can advantageously be clamped between the holder body and the nozzle body. It then simultaneously forms the intermediate plate usually present in injection nozzles, which is lapped on both sides, so that it ensures a tight connection with the pressure line with correspondingly machined surfaces of the holder body on the one hand and the nozzle body on the other hand.
  • the antechambers may be formed by grooves which are wider than the diameter of the bores.
  • the groove depth is less than the ball radius, so that the ball is always held with its largest diameter inside the bores.
  • the groove shape is expediently chosen such that all the bores open into it and that the pressure line is connected to it, offset from the bores. In this way, the connection from the pressure line to the filter surface or the filter gaps, ie the fuel flows from the pressure line connected to the inlet via the inlet-side prechamber through the holes and the outlet-side prechamber into the pressure line leading to the nozzle needle.
  • filter disks By assembling the filter body from several filter disks, it is possible to use filter disks with cutouts that correspond to the groove shape instead of the grooves forming the prechambers. While the pre-chambers are formed by such filter disks, a further filter disk is required, in which the bores are made. Assembled, all filter disks result in the filter body according to the invention.
  • a preferred embodiment provides four bores distributed within half a circumference, which are connected to one another by a prechamber in the form of a part-circular groove.
  • a prechamber in the form of a part-circular groove.
  • FIG. 1 shows an axial section through an injection nozzle with section II of FIG. 3 2 shows an axial section through the injection nozzle according to FIG. 1 with a section according to II-II of FIG. 4
  • FIG. 3 shows a cross section through FIG. 1 according to III-III
  • FIG. 4 shows a cross section through FIG. 2 according to IV-IV 5 shows a variant of the filter body with associated enlargement
  • Figures 1 to 4 show different sections of an injection nozzle 1, the nozzle holder 2 a holder body
  • a compression spring 5 is received, which is biased against a nozzle needle 7 via a pressure pin 6.
  • An intermediate plate which is designed as a disk-shaped filter body 8, is located between the holder body 3 and the nozzle body 4.
  • Holder body 3 and nozzle body 4 are clamped against one another by means of a nozzle clamping nut 9 and centered relative to one another by means of two fixing pins 10.
  • a fuel inlet 11 is connected to the holder body via a connection 12 to a pressure line 13, the upper section of which
  • FIGS. 1 and 2 show the same cross section; they differ only in the different information about the cutting profiles of the associated axial cuts according to FIGS. 1 and 2.
  • the cutting profile II according to FIG. 3 relates to the illustration according to FIG. 1; the course of the cut according to II-II according to FIG. 4 relates to the representations 2.
  • the sectional plane While on the right side of the sectional view according to FIGS. 1 and 2, the sectional plane is in each case laid by a locating pin 10, their sectional sides, which are on the left with respect to the longitudinal axis, differ from one another; in Figure 1, the corresponding sectional plane runs through the fuel pressure line 13; in Figure 2, the corresponding sectional plane runs through one of a total of four bores 18 in the filter body 8.
  • each of these bores 18 there is a filter element in the form of a ball 19, which is thrown back and forth between the stop surfaces during operation of the injection pump, one of which through the Holder body 3, the other is formed by the nozzle body 4.
  • a prechamber 20 is located on both sides between the ball 19 and the associated stop surfaces, as is indicated more precisely in the enlargement of FIG. 5 for drawing reasons.
  • the filter body in the embodiment according to FIG. 5 differs from that according to FIGS. 1 to 4 only in that two balls 19 are filled in the bore 18, whereas in the embodiment according to FIGS. 1 to 4 only a single ball 19 is provided, as can be seen in FIG. 2.
  • 5 shows the filter body 8 as such, ie, with a central bore 21 for the nozzle needle 7 and a further bore 22 for a fixing pin 10.
  • the two end faces of the filter body 8 are lapped so that they are close to the lapped end faces of the holder body 3 on the one hand and the nozzle body 4 on the other.
  • the enlargement V to FIG. 5 illustrates the formation of the antechambers 20 by a groove 23 which, as shown in FIGS.

Landscapes

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

Abstract

Disclosed is an injection nozzle (1) with a fuel filter for a reciprocating internal combustion engine, comprising a filter body (8) in the pressure duct (13) of a nozzle holder (2) which is provided with a holding body (3) and a nozzle body (4). The filter surface or filter slots of the inventive injection nozzle (1) is/are formed by bore holes in the filter body (8) and filter elements that are movably arranged therein. The filter elements are configured as loose balls (19) forming filter slots with the walls of the bore holes (18) such that said loose balls (19) can pulsate as a result of the flow of fuel and dynamically reduce the size of residues.

Description

Einspritzdüse mit Kraftstofffilter Injector with fuel filter
Die Erfindung betrifft eine Einspritzdüse mit Kraftstofffilter für Hubkolbenverbrennungsmotoren mit einem Filterkörper in der Druckleitung eines Halterkörper und Düsenkörper umfassenden Düsenhalters.The invention relates to an injection nozzle with a fuel filter for reciprocating piston internal combustion engines with a filter body in the pressure line of a holder body and nozzle holder comprising nozzle bodies.
Bei Einspritzdüsen, die aus hochpräzisen Passungsteilen bestehen, sind Kraftstofffilter erforderlich, um die empfindlichen Bauteile gegenüber Teilchenverunreinigungen des Kraftstoffs in Form von Spänen, abgelösten Graten oder dergl. zu schützen. Derartige Kraftstofffilter verlängern somit die Standzeit der Einspritzdüse und gewährleisten deren störungsfreien Betrieb.In the case of injection nozzles, which consist of high-precision fitting parts, fuel filters are required in order to protect the sensitive components against particle contamination of the fuel in the form of chips, detached burrs or the like. Such fuel filters thus extend the service life of the injection nozzle and ensure its trouble-free operation.
Bekannte Stabfilter sind entweder im Halterkörper des Düsenhalters oder außerhalb desselben, innerhalb von Anschlußverschraubungen in die Kraftstoffdruckleitung eingesetzt. Durch eine mit Spaltbreite von der Wand des Druckkanals entfernte, in Kanalrichtung erstreckte Trennwand ermöglichen sie das Sammeln unerwünschter Rückstände in einem Schmutzraum auf einer Seite der Trennwand. Der die Trennwand in Umfangsrichtung umspülende Kraftstoff gelangt über einen Sauberraum auf der Reinseite des Stabfilters in den zum Düsenkörper führenden Druckkanal .Known rod filters are used either in the holder body of the nozzle holder or outside the same, within the screw connections in the fuel pressure line. By means of a partition wall which is spaced apart from the wall of the pressure channel and extends in the channel direction, they enable undesired residues to be collected in a dirt space on one side of the partition wall. The fuel washing around the partition in the circumferential direction reaches the pressure channel leading to the nozzle body via a clean room on the clean side of the rod filter.
Die Wirksamkeit derartiger Stabfilter ist begrenzt, da sie wegen des erforderlichen Bauraums nur mit Entfernung vom Düsenkörper angeordnet werden können, und da die Rückstände den Schmutzraum zunehmend füllen, wobei sie teilweise in den Filterspalten hängenbleiben. Auf diese Weise kommt es zu Funktionsstörungen, die nur dadurch behoben werden können, daß der Stabfilter, bzw. das ihn aufnehmende Bauteil ausgewechselt wird. Bedingt durch den strengen Presssitz kann es bei der Montage derartiger Stabfilter zur Ablösung von Metallpartikeln kommen.The effectiveness of such rod filters is limited because, because of the space required, they can only be arranged at a distance from the nozzle body, and because the residues increasingly fill the dirt space, some of which get caught in the filter gaps. This leads to malfunctions that only can be remedied by replacing the rod filter or the component receiving it. Due to the strict press fit, metal particles can become detached when installing such rod filters.
Dem gegenüber liegt der vorliegenden Erfindung die Aufgabe zugrunde, einen robusten und weitgehend wartungsfreien Kraftstofffilter für Einspritzdüsen zu schaffen, der zudem mit einer verhältnismäßig kleinen Filterfläche auskommt, so daß er möglichst nahe der Düsennadel positioniert werden kann.In contrast, the present invention has for its object to provide a robust and largely maintenance-free fuel filter for injection nozzles, which also manages with a relatively small filter area, so that it can be positioned as close as possible to the nozzle needle.
Dazu ist nach dem erfindungsgemäßen Lösungsvorschlag vorgesehen, daß Filterfläche bzw. Filterspalten durch Bohrungen im Filterkörper und darin beweglich angeordnete Filterelemente gebildet sind.For this purpose, according to the proposed solution according to the invention it is provided that the filter surface or filter gaps are formed by bores in the filter body and filter elements arranged movably therein.
Auf diese Weise entsteht ein dynamisch wirkender Kraft- Stofffilter, bei welchem lose in den Bohrungen angeordnete Filterelemente dafür sorgen, daß die in die Bohrungen des Filterkδrpers gelangenden Rückstände durch die mit der Strömung pulsierenden Filterelemente wirksam zerhämmert, zerrieben und damit zerkleinert werden, bis sie eine Teilchengröße erreicht haben, die ein Passieren des Filterspalts ermöglicht. Gerade durch den dynamischen Zerkleinerungseffekt der Filterelemente kann ein Kraftstofffilter mit verhältnismäßig kleiner Filterfläche verwirklicht werden, wobei dessen Spaltabmessungen in Anpassung an die konstruktive Ausgestaltung der Einspritzdüse auszulegen sind. Ein derartiger dynamischer Kraftstofffilter eignet sich besonders gut für Einspritzdüsen bei Direkteinspritzern, insbesondere bei solchen mit sitzgebohrten Düsen, die mit dem be- kannten Stabfilter nicht mehr ausreichend geschützt werden können.In this way, a dynamically acting fuel filter is created, in which filter elements loosely arranged in the bores ensure that the residues entering the bores of the filter body are effectively hammered, ground and thus crushed by the filter elements pulsating with the flow until they become one Have reached particle size, which allows a passage through the filter gap. The dynamic size reduction effect of the filter elements enables a fuel filter with a relatively small filter area to be realized, the gap dimensions of which have to be designed to match the structural design of the injection nozzle. Such a dynamic fuel filter is particularly well suited for injection nozzles for direct injection engines, especially for those with seat-drilled nozzles that are equipped with the Known rod filters can no longer be adequately protected.
Nach einer weiteren Ausgestaltung können mehrere parallel durchströmte Bohrungen vorgesehen sein, je nach Größe der zu gewährleistenden Filterfläche. Es können in jeder Bohrung auch eine Mehrzahl von Filterelementen vorgesehen sein, um auf diese Weise den Zerkleinerungs- effekt zu verbessern.According to a further embodiment, a plurality of boreholes with parallel flow can be provided, depending on the size of the filter surface to be guaranteed. A plurality of filter elements can also be provided in each bore in order to improve the crushing effect in this way.
Besonders vorteilhaft ist es, wenn die Filterelemente Kugeln sind, die mit den Wänden der Bohrungen Filterspalten bilden, aus denen die Filterfläche zusammengesetzt ist. In einer Bohrung können zwei oder mehrere dieser Kugeln hintereinander angeordnet sein. Auf diese Weise erreicht man eine besonders gute Zerkleinerungs- wirkung, weil mehrere Kugeln nicht nur in Strömungsrichtung, sondern auch quer dazu stark pulsieren, soweit dies im Rahmen der vorhandenen Filterspalte möglich ist.It is particularly advantageous if the filter elements are balls that form filter gaps with the walls of the bores, from which the filter surface is composed. Two or more of these balls can be arranged one behind the other in a bore. In this way, a particularly good comminution effect is achieved because several balls pulsate strongly not only in the direction of flow, but also transversely thereto, insofar as this is possible within the existing filter gaps.
Zur Verbesserung der Zerkleinerungswirkung der durch die intermittierende KraftstoffStrömung bewegten Filterelemente ist erfindungsgemäß vorgesehen, daß die Druckleitung in Vorkammern des Filterkörpers ein- und/ oder ausmündet, die wiederum mit der Filterfläche bzw. den Filterspalten kommunizieren. Das bedeutet, daß sowohl die Druckleitungen einerseits als auch die Bohrungen andererseits auf der Ein- und/oder Ausgangsseite der Bohrungen in Vorkammern münden, durch welche der Bewegungsweg der Filterelemente bzw. der Kugeln in Strömungsrichtung entsprechend der Dimensionierung dieser Vorkammern begrenzt wird. Die in den Vorkammern vorhandenen Rückstände werden dort in Zusammenwirken mit den angrenzenden vorzugsweise gehärteten Bauteil- wänden unter der Schlagwirkung der Filterelemente zermalmt, die vorzugsweise ebenfalls gehärtet sind.In order to improve the crushing effect of the filter elements moved by the intermittent fuel flow, it is provided according to the invention that the pressure line opens and / or opens into antechambers of the filter body, which in turn communicate with the filter surface or the filter gaps. This means that both the pressure lines on the one hand and the bores on the other hand open into antechambers on the input and / or output side of the bores, by means of which the path of movement of the filter elements or the balls in the flow direction is limited in accordance with the dimensions of these antechambers. The residues present in the antechambers will work together there crushed with the adjacent preferably hardened component walls under the impact of the filter elements, which are preferably also hardened.
Bei Verwendung von Kugeln als bewegliche Filterelemente ist es zweckmäßig, den Kugeldurchmesser 0,01 bis 0,1 mm kleiner zu wählen als dem Bohrungsdurchmesser entspricht, wobei die maximale Spaltbreite diesem Maß entspricht .When using balls as movable filter elements, it is expedient to choose a ball diameter of 0.01 to 0.1 mm smaller than the bore diameter, the maximum gap width corresponding to this dimension.
Eine bevorzugte Ausführungsform des Filterkörpers besteht darin, das dieser im wesentlichen scheibenförmig ausgebildet ist, so daß er vorteilhaft zwischen Halterkörper und Düsenkörper eingespannt werden kann. Er bildet dann gleichzeitig die bei Einspritzdüsen üblicherweise vorhandene Zwischenplatte, welche auf beiden Seiten geläppt ist, so daß sie mit entsprechend bearbeiteten Oberflächen des Halterkörper einerseits und des Düsenkörpers andererseits eine gegenüber der Druckleitung dichte Verbindung gewährleistet .A preferred embodiment of the filter body is that it is essentially disc-shaped, so that it can advantageously be clamped between the holder body and the nozzle body. It then simultaneously forms the intermediate plate usually present in injection nozzles, which is lapped on both sides, so that it ensures a tight connection with the pressure line with correspondingly machined surfaces of the holder body on the one hand and the nozzle body on the other hand.
Bei einem derartigen scheibenförmigen Filterkörper kann es zweckmäßig sein, daß die Vorkammern durch Nuten gebildet sind, welche breiter sind als der Durchmesser der Bohrungen. Bei Verwendung von Kugeln als Filterelemente ist dabei zweckmäßig, daß die Nuttiefe geringer ist als der Kugelradius, so daß die Kugel stets mit ihrem größten Durchmesser im Inneren der Bohrungen gehalten ist.With such a disk-shaped filter body, it may be expedient for the antechambers to be formed by grooves which are wider than the diameter of the bores. When using balls as filter elements, it is expedient that the groove depth is less than the ball radius, so that the ball is always held with its largest diameter inside the bores.
Zwecksmäßigerweise ist die Nutenform so gewählt, daß darin alle Bohrungen münden und daß daran, versetzt zu den Bohrungen, auch die Druckleitung angeschlossen ist. Auf diese Weise wird die Verbindung von der Drucklei- tung zur Filterfläche bzw. den Filterspalten hergestellt, d. h., der Kraftstoff strömt aus der mit dem Zulauf verbundenen Druckleitung über die ein- gangsseitige Vorkammer durch die Bohrungen und die aus- gangsseitige Vorkammer in die zur Düsennadel führende Druckleitung.The groove shape is expediently chosen such that all the bores open into it and that the pressure line is connected to it, offset from the bores. In this way, the connection from the pressure line to the filter surface or the filter gaps, ie the fuel flows from the pressure line connected to the inlet via the inlet-side prechamber through the holes and the outlet-side prechamber into the pressure line leading to the nozzle needle.
Indem der Filterkδrper aus mehreren Filterscheiben zusammengesetzt wird, besteht die Möglichkeit, anstelle der die Vorkammern bildenden Nuten solche Filterscheiben mit Ausschnitten einzusetzen, welche der Nutenform entsprechen. Während durch derartige Filterscheiben die Vorkammern ausgebildet werden, ist eine weitere Filterscheibe erforderlich, in welcher die Bohrungen eingebracht sind. Zusammengesetzt ergeben alle Filterscheiben den erfindungsgemäßen Filterkδrper.By assembling the filter body from several filter disks, it is possible to use filter disks with cutouts that correspond to the groove shape instead of the grooves forming the prechambers. While the pre-chambers are formed by such filter disks, a further filter disk is required, in which the bores are made. Assembled, all filter disks result in the filter body according to the invention.
Eine bevorzugte Ausführungsform sieht vier innerhalb eines halben Umfangs verteilte Bohrungen vor, die durch eine Vorkammer in Form einer teilkreisförmigen Nut miteinander verbunden sind. Im Rahmen der Erfindung besteht jedoch die Möglichkeit, noch weitere Bohrungen in der anderen Hälfte des Filterkörpers anzubringen, sollte eine entsprechend vergrößerte Filterfläche erforderlich sein. Zwischen den Bohrungen ist noch Platz vorzusehen, für die Anordnung wenigstens zweier Fixierstifte und den gegenüber den Bohrungen versetzten Anschluß der Kraftstoffdruckleitung.A preferred embodiment provides four bores distributed within half a circumference, which are connected to one another by a prechamber in the form of a part-circular groove. Within the scope of the invention, however, there is the possibility of making further bores in the other half of the filter body if a correspondingly enlarged filter area is required. Space must still be provided between the bores for the arrangement of at least two fixing pins and the connection of the fuel pressure line offset with respect to the bores.
Im folgenden wird ein Ausführungsbeispiel der Erfindung anhand der Zeichnung erläutert . Es zeigenAn exemplary embodiment of the invention is explained below with reference to the drawing. Show it
Fig. 1 einen Axialschnitt durch eine Einspritzdüse mit Schnittverlauf I-I der Fig. 3 Fig. 2 einen Axialschnitt durch die Einspritzdüse gemäß Fig. 1 mit Schnittverlauf gemäß II-II der Fig. 4 Fig. 3 einen Querschnitt durch Fig. 1 gemäß III-III Fig. 4 einen Querschnitt durch Fig. 2 gemäß IV-IV Fig. 5 eine Variante des Filterkörpers mit zugehöriger Ausschnittsvergrößerung1 shows an axial section through an injection nozzle with section II of FIG. 3 2 shows an axial section through the injection nozzle according to FIG. 1 with a section according to II-II of FIG. 4 FIG. 3 shows a cross section through FIG. 1 according to III-III FIG. 4 shows a cross section through FIG. 2 according to IV-IV 5 shows a variant of the filter body with associated enlargement
Die Figuren 1 bis 4 zeigen verschiedene Schnitte einer Einspritzdüse 1, deren Düsenhalter 2 einen HalterkörperFigures 1 to 4 show different sections of an injection nozzle 1, the nozzle holder 2 a holder body
3 und einen Düsenkörper 4 umfaßt. Im Halterkörper 3 ist eine Druckfeder 5 aufgenommen, welche über einen Druckbolzen 6 gegen eine Düsennadel 7 vorgespannt ist. Zwischen Halterkörper 3 und Düsenkörper 4 befindet sich eine Zwischenplatte, welche als scheibenförmiger Filterkörper 8 ausgebildet ist . Halterkörper 3 und Düsenkörper 4 sind mittels einer Düsenspannmutter 9 gegeneinander verspannt und mittels zweier Fixierstifte 10 zueinander zentriert. Am Halterkörper ist ein Kraft- stoffzulauf 11 über eine Anschlußverbindung 12 an eine Druckleitung 13 angeschlossen, deren oberer Abschnitt3 and a nozzle body 4 comprises. In the holder body 3, a compression spring 5 is received, which is biased against a nozzle needle 7 via a pressure pin 6. An intermediate plate, which is designed as a disk-shaped filter body 8, is located between the holder body 3 and the nozzle body 4. Holder body 3 and nozzle body 4 are clamped against one another by means of a nozzle clamping nut 9 and centered relative to one another by means of two fixing pins 10. A fuel inlet 11 is connected to the holder body via a connection 12 to a pressure line 13, the upper section of which
14 über den Filterkörper 8 und einen unteren Abschnitt14 over the filter body 8 and a lower section
15 mit einem Ringraum 16 zum Betätigen der Düsennadel 7 in Verbindung steht . Am oberen Ende des die Druckfeder 5 enthaltenden Niederdruckraums ist ein Leckanschluß 17 vorgesehen. Soweit die genannten Bauteile in den Figuren 1 bis 4 vorkommen, sind sie mit denselben Bezugs- z-eichen versehen. Die Schnitte gemäß den Figuren 3 und15 communicates with an annular space 16 for actuating the nozzle needle 7. At the upper end of the low pressure chamber containing the compression spring 5, a leakage connection 17 is provided. Insofar as the components mentioned appear in FIGS. 1 to 4, they are provided with the same reference signs. The cuts according to Figures 3 and
4 zeigen denselben Querschnitt; sie unterscheiden sich lediglich durch unterschiedliche Angaben zu den Schnittverläufen der zugehörigen Axialschnitte gemäß den Figuren 1 und 2. Der Schnittverlauf I-I gemäß Figur 3 betrifft die Darstellung nach Figur 1; der Schnitt- verlauf gemäß II-II gemäß Figur 4 betrifft die Darstel- lung nach Figur 2. Während auf der rechten Seite der Schnittdarstellung nach den Figuren 1 und 2 die Schnittebene jeweils durch einen Fixierstift 10 gelegt ist, unterscheiden sich deren bezüglich der Längsachse linken SchnittSeiten voneinander; in Figur 1 verläuft die entsprechende Schnittebene durch die Kraftstoffdruckleitung 13; in Figur 2 verläuft die entsprechende Schnittebene durch eine von insgesamt vier Bohrungen 18 im Filterkörper 8. In jeder dieser Bohrungen 18 befindet sich ein Filterelement in Form einer Kugel 19, welche im Betrieb der Einspritzpumpe zwischen Anschlagflächen hin- und hergeschleudert wird, deren eine durch den Halterkörper 3 die andere durch den Düsenkörper 4 gebildet ist. Auf beiden Seiten zwischen der Kugel 19 und den zugeordneten Anschlagflächen befindet sich eine Vorkammer 20, wie aus zeichnerischen Gründen genauer in der Vergrößerung zu Figur 5 angegeben ist.4 show the same cross section; they differ only in the different information about the cutting profiles of the associated axial cuts according to FIGS. 1 and 2. The cutting profile II according to FIG. 3 relates to the illustration according to FIG. 1; the course of the cut according to II-II according to FIG. 4 relates to the representations 2. While on the right side of the sectional view according to FIGS. 1 and 2, the sectional plane is in each case laid by a locating pin 10, their sectional sides, which are on the left with respect to the longitudinal axis, differ from one another; in Figure 1, the corresponding sectional plane runs through the fuel pressure line 13; in Figure 2, the corresponding sectional plane runs through one of a total of four bores 18 in the filter body 8. In each of these bores 18 there is a filter element in the form of a ball 19, which is thrown back and forth between the stop surfaces during operation of the injection pump, one of which through the Holder body 3, the other is formed by the nozzle body 4. A prechamber 20 is located on both sides between the ball 19 and the associated stop surfaces, as is indicated more precisely in the enlargement of FIG. 5 for drawing reasons.
Der Filterkörper in der Ausführungsform gemäß Figur 5 unterscheidet sich von demjenigen gemäß den Figuren 1 bis 4 nur dadurch, daß in der Bohrung 18 zwei Kugeln 19 eingefüllt sind, während bei der Ausführungsform gemäß den Figuren 1 bis 4 nur eine einzige Kugel 19 vorgesehen ist, wie in Figur 2 erkennbar. Im übrigen zeigt Figur 5 den Filterkörper 8 als solchen, d.h. , mit einer zentralen Bohrung 21 für die Düsennadel 7 und einer weiteren Bohrung 22 für einen Fixierstift 10. Die beiden Stirnseiten des Filterkörpers 8 sind geläppt, so daß sie dicht an den ebenfalls geläppten Stirnseiten des Halterkörpers 3 einerseits und des Düsenkδrpers 4 andererseits anliegen. Die Vergrößerung V zur Figur 5 verdeutlicht die Ausbildung der Vorkammern 20 durch eine Nut 23, welche wie in den Figuren 3 und 4 gezeigt, einen Teilkreisbogen beschreibt und damit alle Bohrun- gen 18 miteinander verbindet. Entsprechend der gewählten Nuttiefe schlagen die Kugeln 19 unter der Wirkung der intermittierenden Hochdruckströmung in der Druckleitung 13 in axialer Richtung gemäß Doppelpfeil 24 aneinander bzw. gegen die angrenzenden Anschlagflächen, welche gebildet sind durch die zugewandte Stirnseite 25 des Halterkörpers 3 einerseits und die gegenüberliegende Stirnseite 26 des Düsenkörpers 4 andererseits. Entsprechend ihrem freien Hub in axialer Richtung wirken die Kugeln 19 hammerartig gegen Metallspäne und dergleichen Rückstände, solange sich diese im Wirkungsbereich der Kugeln 19 befinden. Sie können die Bohrungen 18 passieren, wenn sie entweder von vornherein kleiner sind als die in der Vergrößerung V gezeichnete Spaltbreite zwischen Kugelumfang und Bohrungswand oder nachdem sie unter der Wirkung der Kugeln 19 entsprechend zerkleinert worden sind. Unter dieser dynamischen Zerkleinerungswirkung der Kugeln 19 gelingt es, Rückstände aus Metallspänen, Gratteilen und dergleichen, die sich in den Vorkammern ansammeln, derart zu zermalen, daß sie die Filterspalten überwinden können, so daß ein wartungsfreies Kraftstofffilter entsteht .The filter body in the embodiment according to FIG. 5 differs from that according to FIGS. 1 to 4 only in that two balls 19 are filled in the bore 18, whereas in the embodiment according to FIGS. 1 to 4 only a single ball 19 is provided, as can be seen in FIG. 2. 5 shows the filter body 8 as such, ie, with a central bore 21 for the nozzle needle 7 and a further bore 22 for a fixing pin 10. The two end faces of the filter body 8 are lapped so that they are close to the lapped end faces of the holder body 3 on the one hand and the nozzle body 4 on the other. The enlargement V to FIG. 5 illustrates the formation of the antechambers 20 by a groove 23 which, as shown in FIGS. 3 and 4, describes a partial arc and thus all bores. gen 18 connects with each other. In accordance with the selected groove depth, the balls 19 strike against one another or against the adjacent stop surfaces, which are formed by the facing end face 25 of the holder body 3 on the one hand and the opposite end face 26 of the bearing, under the effect of the intermittent high pressure flow in the pressure line 13 in the axial direction Nozzle body 4 on the other hand. Corresponding to their free stroke in the axial direction, the balls 19 act like a hammer against metal chips and the like residues as long as they are within the sphere of action of the balls 19. You can pass through the holes 18 if they are either smaller from the outset than the gap width drawn in the enlargement V between the circumference of the ball and the wall of the hole or after they have been comminuted accordingly under the action of the balls 19. Under this dynamic crushing action of the balls 19, residues of metal chips, burrs and the like, which accumulate in the antechambers, can be crushed in such a way that they can overcome the filter gaps, so that a maintenance-free fuel filter is produced.
Bei zwei übereinander angeordneten Kugeln wird diese Wirkung noch dadurch verbessert, daß die Mahlwirkung auch in Querrichtung gemäß den Doppelpfeilen 27 eintritt, da sich die Kugeln stets gegeneinander aus ihrer Mittenlage ablenken. In der Darstellung gemäß Vergrößerung V befindet sich die obere Kugel 19 in der linken, die untere Kugel 19 in der rechten Anlage an der Wand der Bohrung 18, so daß jeweils auf der gegenüberliegenden Seite der maximale Filterspalt gebildet ist, d.h., die Kugeln 19 ermöglichen den Durchtritt entsprechend dem gekrümmten Pfeil 28. In the case of two balls arranged one above the other, this effect is further improved by the fact that the grinding action also occurs in the transverse direction according to the double arrows 27, since the balls always deflect against one another from their central position. In the illustration according to enlargement V, the upper ball 19 is in the left, the lower ball 19 in the right system on the wall of the bore 18, so that the maximum filter gap is formed on the opposite side, ie, the balls 19 enable the passage corresponding to the curved arrow 28.

Claims

Ansprüche Expectations
Einspritzdüse (1) mit Kraftstofffilter für Hubkolbenverbrennungsmotor, mit einem Filterkörper (8) in der Druckleitung (13) eines Halterkörper (3) und Düsenkörper (4) umfassenden Düsenhalters (2) , dadurch gekennzeichnet, daß Filterfläche bzw. Filterspalten durch Bohrungen (18) im Filterkδrper (8) und darin beweglich angeordnete Filterelemente gebildet sind.Injection nozzle (1) with a fuel filter for a reciprocating piston internal combustion engine, with a filter body (8) in the pressure line (13) of a holder body (3) and nozzle holder (2) comprising nozzle body (4), characterized in that the filter surface or filter gaps are provided with bores (18). in the filter body (8) and filter elements movably arranged therein are formed.
Einspritzdüse nach Anspruch 1, dadurch gekennzeichnet, daß mehrere parallel durchströmte Bohrungen (18) vorgesehen sind.Injection nozzle according to Claim 1, characterized in that a plurality of bores (18) through which there are parallel flows are provided.
Einspritzdüse nach Anspruch 1, dadurch gekennzeichnet, daß die Druckleitung (13) in Vorkammern (20) des Filterkörpers (8) ein- und/oder ausmündet, die mit der Filterfläche bzw. den Filterspalten kommunizieren.Injection nozzle according to claim 1, characterized in that the pressure line (13) opens and / or opens into antechambers (20) of the filter body (8) which communicate with the filter surface or the filter gaps.
Einspritzdüse nach Anspruch 1, dadurch gekennzeichnet, daß der Filterkörper (8) im wesentlichen scheibenförmig ausgebildet und zwischen Halterkδrper (3) und Düsenkörper (4) eingespannt ist.Injection nozzle according to claim 1, characterized in that the filter body (8) is substantially disc-shaped and is clamped between the holder body (3) and the nozzle body (4).
Einspritzdüse nach Anspruch 4, dadurch gekennzeichnet, daß der Filterkörper (8) aus mehreren Filterscheiben zusammengesetzt ist. Einspritzdüse nach Anspruch 1, dadurch gekennzeichnet, daß die Filterelemente Kugeln (19) sind, die mit den Wänden der Bohrungen (18) Filterspalten bilden, aus denen die Filterfläche zusammengesetzt ist .Injection nozzle according to claim 4, characterized in that the filter body (8) is composed of several filter disks. Injection nozzle according to Claim 1, characterized in that the filter elements are balls (19) which, with the walls of the bores (18), form filter gaps from which the filter surface is composed.
Einspritzdüse nach Anspruch 6, dadurch gekennzeichnet, daß zwei oder mehrere Kugeln (19) hintereinander in eine Bohrung (18) eingesetzt sind.Injection nozzle according to claim 6, characterized in that two or more balls (19) are inserted one behind the other in a bore (18).
Einspritzdüse nach Anspruch 3, dadurch gekennzeichnet, daß die Vorkammern (20) durch Nuten (23) gebildet sind, welche breiter sind als der Durchmesser der Bohrungen (18) .Injection nozzle according to claim 3, characterized in that the antechambers (20) are formed by grooves (23) which are wider than the diameter of the bores (18).
Einspritzdüse nach Anspruch 8, dadurch gekennzeichnet, daß die Nuttiefe geringer ist als der Kugelradius.Injection nozzle according to claim 8, characterized in that the groove depth is less than the ball radius.
Einspritzdüse nach Anspruch 6, dadurch gekennzeichnet, daß der Kugeldurchmesser 0,01 bis 0,1 mm kleiner ist als der Bohrungsdurchmesser. Injection nozzle according to claim 6, characterized in that the ball diameter is 0.01 to 0.1 mm smaller than the bore diameter.
EP03708080A 2002-02-27 2003-02-01 Injection nozzle with a fuel filter Expired - Lifetime EP1478843B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI200330055T SI1478843T1 (en) 2002-02-27 2003-02-01 Injection nozzle with a fuel filter

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10208544 2002-02-27
DE10208544A DE10208544A1 (en) 2002-02-27 2002-02-27 Injector with fuel filter
PCT/EP2003/001014 WO2003072933A1 (en) 2002-02-27 2003-02-01 Injection nozzle with a fuel filter

Publications (2)

Publication Number Publication Date
EP1478843A1 true EP1478843A1 (en) 2004-11-24
EP1478843B1 EP1478843B1 (en) 2005-06-08

Family

ID=27740481

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03708080A Expired - Lifetime EP1478843B1 (en) 2002-02-27 2003-02-01 Injection nozzle with a fuel filter

Country Status (9)

Country Link
US (1) US20050116068A1 (en)
EP (1) EP1478843B1 (en)
JP (1) JP2005518502A (en)
KR (1) KR20040086440A (en)
CN (1) CN1630784A (en)
AU (1) AU2003212232A1 (en)
DE (2) DE10208544A1 (en)
ES (1) ES2234454T3 (en)
WO (1) WO2003072933A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005106237A1 (en) * 2004-04-29 2005-11-10 Mazrek Ltd. Arrangement of joint packing between the pump-injector (injector) body and nozzle body, for internal combustion engines.
DE102004028131A1 (en) * 2004-06-09 2006-01-05 Motorenfabrik Hatz Gmbh & Co. Kg Fuel injection device for diesel engines comprises an intermediate plate having an axial channel with a blocking valve for blocking the channel in the direction toward a nozzle holder
DE102014212779A1 (en) * 2014-07-02 2016-01-07 Continental Automotive Gmbh fuel injector

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1036576B (en) * 1946-01-17 1958-08-14 Giuseppe Sola Injection nozzle for internal combustion engines
US2749182A (en) * 1953-01-27 1956-06-05 John F Campbell Nozzle construction
DE3237932A1 (en) * 1982-10-13 1984-04-19 Robert Bosch Gmbh, 7000 Stuttgart FUEL INJECTION NOZZLE FOR INTERNAL COMBUSTION ENGINES
US5238192A (en) * 1991-12-18 1993-08-24 Siemens Automotive L.P. Filter for solenoid operated fluid metering devices
US6015103A (en) * 1998-06-08 2000-01-18 General Motors Corporation Filter for fuel injector
US6572028B1 (en) * 2000-01-19 2003-06-03 Visteon Global Technologies, Inc. Combined needle guide, filter, and flow director for gasoline fuel injectors
US6708906B2 (en) * 2000-12-29 2004-03-23 Siemens Automotive Corporation Modular fuel injector having a surface treatment on an impact surface of an electromagnetic actuator and having an integral filter and dynamic adjustment assembly

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO03072933A1 *

Also Published As

Publication number Publication date
AU2003212232A1 (en) 2003-09-09
EP1478843B1 (en) 2005-06-08
ES2234454T1 (en) 2005-07-01
DE10208544A1 (en) 2003-09-11
WO2003072933A1 (en) 2003-09-04
DE50300637D1 (en) 2005-07-14
ES2234454T3 (en) 2005-12-01
JP2005518502A (en) 2005-06-23
US20050116068A1 (en) 2005-06-02
CN1630784A (en) 2005-06-22
KR20040086440A (en) 2004-10-08

Similar Documents

Publication Publication Date Title
DE3328088C2 (en) Fuel injection pump for internal combustion engines
DE3725361A1 (en) AXIAL PISTON MACHINE IN TYPE DISC OR TYPE AXIS DESIGN WITH SLOT CONTROL AND PRESSURE COMPENSATION CHANNELS
EP0486505B1 (en) Fuel injection pump for diesel internal combustion engines
DE3610658A1 (en) FUEL INJECTION NOZZLE FOR INTERNAL COMBUSTION ENGINES
DE69509821T2 (en) Armature arrangement of a fuel injector
DE69616448T2 (en) Structure of a magnetic gap
DE3544130A1 (en) GRIPPERS FOR HANDLING DEVICES
EP1753989B1 (en) Check valve
DE69204075T2 (en) FUEL INJECTION VALVE FOR COMBUSTION ENGINES.
DE3729725C2 (en)
EP0084182A1 (en) Fuel injection nozzle for an internal-combustion engine
DE19628815A1 (en) Protective shield for hydraulic hammer
EP1478843B1 (en) Injection nozzle with a fuel filter
DE102005034879B4 (en) Nozzle assembly for an injection valve
DE10103161A1 (en) Piston pin arrangement
DE4000402C2 (en)
DE2815548A1 (en) EXHAUST VALVE FOR A ROTARY PISTON COMPRESSOR
WO2003072932A1 (en) Injection nozzle with a fuel filter
WO1995024552A1 (en) Injection nozzle for internal combustion engines
EP0089568A1 (en) Fluid operated linear-to-rotary actuator
DE2217066A1 (en) Fuel injection pump for internal combustion engines
EP0460592B1 (en) Hydraulically impulsed wrench
DE1036576B (en) Injection nozzle for internal combustion engines
CH717897A2 (en) Valve device for controlled passage of a medium, particularly in the high-pressure range.
DE102022005123A1 (en) Modular tool and method for ejecting an insert of a modular tool

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20040722

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT SE SI SK TR

AX Request for extension of the european patent

Extension state: AL LT LV MK RO

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GBC Gb: translation of claims filed (gb section 78(7)/1977)
GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): CZ DE ES GB IT SI

RBV Designated contracting states (corrected)

Designated state(s): CZ DE ES GB IT SI

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 20050608

REF Corresponds to:

Ref document number: 50300637

Country of ref document: DE

Date of ref document: 20050714

Kind code of ref document: P

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2234454

Country of ref document: ES

Kind code of ref document: T3

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SI

Payment date: 20060111

Year of fee payment: 4

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CZ

Payment date: 20060113

Year of fee payment: 4

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 20060220

Year of fee payment: 4

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20060228

Year of fee payment: 4

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20060428

Year of fee payment: 4

26N No opposition filed

Effective date: 20060309

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20070201

REG Reference to a national code

Ref country code: SI

Ref legal event code: KO00

Effective date: 20070911

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CZ

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070201

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070202

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070901

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070201

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20070202

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070202

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070201