EP1795743B1 - Edge filter - Google Patents

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Publication number
EP1795743B1
EP1795743B1 EP06122398A EP06122398A EP1795743B1 EP 1795743 B1 EP1795743 B1 EP 1795743B1 EP 06122398 A EP06122398 A EP 06122398A EP 06122398 A EP06122398 A EP 06122398A EP 1795743 B1 EP1795743 B1 EP 1795743B1
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EP
European Patent Office
Prior art keywords
splitting
fuel
basic body
region
stick filter
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Not-in-force
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EP06122398A
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German (de)
French (fr)
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EP1795743A1 (en
Inventor
Giovanni Ferraro
Dietmar Uhlmann
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP1795743A1 publication Critical patent/EP1795743A1/en
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Publication of EP1795743B1 publication Critical patent/EP1795743B1/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/165Filtering elements specially adapted in fuel inlets to injector

Definitions

  • the invention relates to a rod filter for fuel injection valves according to the preamble of claim 1.
  • Such a rod filter is for example by the DE 103 07 529 A1 known.
  • the known rod filter has a filter body which is inserted into an inlet channel of a nozzle body of a fuel injection valve and fixed in the axial direction by a diameter constriction of the inlet channel and a securing element.
  • the diameter of the filter body is smaller than the diameter of the inlet channel, so that the fuel must flow through the resulting gap.
  • the difference of the outer diameter in a region of the filter body and the diameter of the inlet channel determine the width of the gap through which the fuel must flow, with particles that are larger than this gap width remain in longitudinal grooves of the filter body and do not get into the fuel injection valve.
  • the rod filter according to the invention with the features of claim 1 and the fuel injection valve according to the invention with the features of claim 11 have the advantage that the particles are supplied to the dicing area, wherein due to the reduced gap width, which dictates the flow cross-section in the dicing, the dewatering effect in the ditching is improved.
  • the dicing region may adjoin the first section directly or may be arranged slightly spaced from the first section.
  • the main body of the rod filter has on its surface one or more dicing areas.
  • the surface of the base body is structured at least in the dicing area.
  • Such structuring may be produced by knurling, indentations, impressions or otherwise.
  • a plurality of dicing edges is provided in the dicing area, which are formed for example on a plurality of pyramidal elevations.
  • the cross section of the main body in the dicing area increases in the flow direction. This will initially be relatively large particles divided and with decreasing flow cross-section, which is due to the enlargement of the cross section of the body in the flow direction, a further division of particles is made possible.
  • the base body is designed ellipsoidal, whereby the particle reduction is further improved.
  • the dicing region is preferably provided in a middle region of the base body, in which the base body has a relatively large cross section, so that the gap remaining with respect to a fuel inlet channel is relatively small.
  • At least one fastening device connected to the main body is advantageously provided, which has mutually twisted fastening webs.
  • a fastening device may have three fixing webs which are offset by 120 ° relative to one another.
  • the rod filter is particularly suitable for filtering fuel that is passed under high pressure through a fuel line.
  • a pressure pulse which is generated, for example, by the opening and closing of a fuel injection valve or by a pressure generating device provided on the fuel line, preferably an elastic deformation of the base body and / or an elastic deformation of the fuel line is effected, so that in the region of the dicing region of the rod filter between the main body and the fuel line existing flow cross section is varied. This results in an advantageous chopping of the particles entrained in the fuel.
  • Fig. 1 shows a first embodiment of a rod filter 1 of the invention, which is arranged in a fuel inlet channel 2 of a partially shown fuel inlet nozzle 3 of a fuel injection valve.
  • the rod filter 1 is used in particular for injectors of fuel injection systems of air-compressing, self-igniting internal combustion engines, in which a fuel under high pressure is filtered through the rod filter 1.
  • a preferred use of the rod filter 1 is for a fuel injection system with a common rail, the diesel fuel under high pressure leads to multiple fuel injectors.
  • the rod filter 1 according to the invention and the fuel injection valve according to the invention are also suitable for other applications.
  • the rod filter 1 has a base body 4, which is configured as an ellipsoidal base body 4. Furthermore, the bar filter 1 has a first fastening device 5 and a second fastening device 6, wherein the first fastening device 5 comprises three fixing webs 7, 8 offset by 120 ° to one another and the second fastening device 6 comprises three fastening rods 9, 10 arranged offset from one another by 120 ° , With respect to a flow direction 11 of a fuel flow, the fastening rods 7, 8 of the first fastening device 5 are rotated by 60 ° relative to the fastening rods 9, 10 of the second fastening device 6, resulting in an advantageous influencing of the fuel flow.
  • the main body 4 of the rod filter 1 has a dicing region 13 on a surface 12.
  • the dicing region 13 has the shape of a strip with the width B, wherein the dicing region 13 is provided in a middle region of the base body 4, in which a distance A between the fuel inlet channel 2 and the surface 12 of the base body 4 is relatively small.
  • the distance A defines an annular gap which defines a minimum flow cross-section for the fuel flow flowing in the flow direction 11. Due to the ellipsoidal shape of the base body 4 is the Fuel flow led to the dicing area 13 and accelerated to the dicing area 13 out.
  • the fuel flow is usually not continuous, but is pulsed with the opening and closing of the fuel injector.
  • a periodic pressure build-up can take place on the side of the common rail or a high pressure can be present continuously, which leads to pressure pulsations via the switching of the fuel injection valve.
  • the pressure pulsations of the fuel result in an elastic deformation of the fuel inlet nozzle 3 and / or of the main body 4 of the rod filter 1, so that the distance A varies with the pressure pulsations.
  • Particles contained in the fuel, which are supplied to the dicing area 13, are thereby divided into the dicing area 13.
  • the surface 12 of the base body 4 at least in the dicing region 13 a pyramidal structure, based on the Fig. 3 is described in detail. In the in Fig. 1 illustrated embodiment, the pyramidal structure over the entire surface 12 of the base body 4 is executed.
  • Fig. 1 Traces 14, 15, 16 represented by the particles contained in the fuel, which are chopped in the dicing region 13 between the surface 12 and the fuel inlet channel 2.
  • Fig. 2 shows a rod filter 1, which is arranged in a fuel inlet channel 2 of a fuel inlet nozzle 3 of a fuel injection valve, according to a second embodiment of the invention.
  • the base body 4 has a first End piece 21, a second end piece 22 and an intermediate piece 23 which connects the first end piece 21 with the second end piece 22.
  • the end pieces 21, 22 are each ellipsoid Halb Eisenörmig configured so that they each form half of an ellipsoidal body.
  • the intermediate piece 23 is cylindrical.
  • the dicing area 13 is provided on the surface 12 of the intermediate piece 23 of the main body 4, the surface 12 being substantially smooth on the end pieces 21, 22.
  • the pyramidal structure in the dicing region 13 can be configured, for example, by a plurality of indentations, the indentations being formed, for example, by V-shaped grooves of a thickness in which a multiplicity of points are formed, as is apparent from FIGS Fig. 3 is shown in more detail.
  • the indentations may be provided at an angle of 45 ° to the surface 12 of the main body 4.
  • Fig. 3 shows a partial section along the in Fig. 1 with III designated cutting line in a viewing direction, the opposite to the flow direction 11 is.
  • the fastening web 7 of the first fastening device 5 bears against the fuel inlet channel 2 of the fuel inlet nozzle 3.
  • the remaining fastening webs of the fastening devices 5, 6 abut against the fuel inlet channel 2 of the fuel inlet nozzle 3.
  • the fastening devices 5, 6 can be pressed in the fuel inlet 3, in order to allow a reliable attachment of the rod filter 1 in the fuel inlet 3.
  • the main body 4 has a pyramidal structure which comprises a large number of pyramidal elevations 24 to 32.
  • a tip 33 of the elevation 24 has a distance A from the fuel inlet channel 2. Due to the oidförmigen design of the base body 4, a distance A 'a tip 34 of the pyramidal elevation 29 is greater than the distance A. Since the particles transported by the fuel first reach the pyramidal elevation 34, a further division of initially relatively large particles is possible. The division of the particles takes place essentially by means of edges 35, 36 of the pyramidal elevation 24 and further (in the Fig. 3 not designated) edges of the elevations 25 to 32.
  • a division of the passing past the edges 35, 36 particles is already possible because of the mediated by the pulsed fuel flow jerky movement of the particles.
  • an elastic configuration of the base body 4 and / or an elastic configuration of the fuel inlet nozzle 3 is possible, which allows a variation of the distance A and the distance A with respect to the pressure pulsations of the fuel. This can specifically chop up the particles be achieved.
  • the geometry and the number of pyramidal elevations 24 to 32 in the Fig. 3 to simplify the explanation of the invention. Specifically, a significantly larger number of juxtaposed pyramidal elevations 24 to 27 and juxtaposed pyramidal elevations 28 to 32 may be provided.
  • the elevations 24 to 32 may also have a different configuration, in particular a truncated pyramidal configuration is possible.
  • the structuring of the dicing region 13 is possible by cutting or non-cutting methods, in particular by embossing.

Abstract

The filter has a base body (4) which is formed in ellipsoid shape and includes a fragmentation area (13) on a surface (12). The area fragments the particles that flow through it, and includes a pyramid structure with a set of pyramid shaped elevations. Two fixing units (5, 6) are connected with the base body and include fixing bars (7, 8) and rods (9, 10) which are arranged at 120 degrees to one another in an offset manner, respectively.

Description

Stand der TechnikState of the art

Die Erfindung betrifft ein Stabfilter für Brennstoffeinspritzventile gemäß dem Oberbegriff von Anspruch 1.The invention relates to a rod filter for fuel injection valves according to the preamble of claim 1.

Ein derartiges Stabfilter ist beispielsweise durch die DE 103 07 529 A1 bekannt geworden.Such a rod filter is for example by the DE 103 07 529 A1 known.

Das bekannte Stabfilter weist einen Filterkörper auf, der in einen Zulaufkanal eines Düsenkörpers eines Kraftstoffeinspritzventils eingelegt und in axialer Richtung durch eine Durchmesserverengung des Zulaufkanals und ein Sicherungselement fixiert ist. Der Durchmesser des Filterkörpers ist kleiner als der Durchmesser des Zulaufkanals, so dass der Kraftstoff durch den sich ergebenden Spalt fließen muss. Der Unterschied des Außendurchmessers in einem Bereich des Filterkörpers und des Durchmessers des Zulaufkanals legen die Breite des Spalts fest, durch den der Kraftstoff strömen muss, wobei Partikel, die größer als diese Spaltbreite sind, in Längsnuten des Filterkörpers bleiben und nicht in das Kraftstoffeinspritzventil gelangen.The known rod filter has a filter body which is inserted into an inlet channel of a nozzle body of a fuel injection valve and fixed in the axial direction by a diameter constriction of the inlet channel and a securing element. The diameter of the filter body is smaller than the diameter of the inlet channel, so that the fuel must flow through the resulting gap. The difference of the outer diameter in a region of the filter body and the diameter of the inlet channel determine the width of the gap through which the fuel must flow, with particles that are larger than this gap width remain in longitudinal grooves of the filter body and do not get into the fuel injection valve.

Das aus der DE 103 07 529 A1 bekannte Stabfilter hat den Nachteil, dass sich die zum Filtern des Kraftstoffs vorgesehenen Längsnuten während des Betriebs mit Partikeln füllen, so dass die Funktionsfähigkeit des Filters mit der Zeit abnimmt und gegebenenfalls ein Austausch erforderlich ist. Dabei kann der Zulaufkanal auch verstopfen, wodurch das betroffene Kraftstoffeinspritzventil ausfällt.That from the DE 103 07 529 A1 known rod filter has the disadvantage that fill the grooves provided for filtering the fuel during operation with particles, so that the functionality of the filter decreases over time and, if necessary, an exchange is required. In this case, the inlet channel can also clog, causing the affected fuel injector fails.

Aus der nachveröffentlichten EP-A-1729006 ist ein Stabfilter mit zwei Gruppen von axial einseitig offenen Nuten bekannt, die jeweils durch einen strukturierten gehen von der einen Stirnfläche des Stabfilters und die Nuten der anderen Gruppe von der anderen Stirnfläche des Stabfilters aus. Der strukturierte Oberflächenabschnitt ist beispielsweise durch eine Rändelung gebildet.From the post-published EP-A-1729006 is a rod filter with two groups of axially one-sided open grooves known, each through a structured emanate from the one end face of the rod filter and the grooves of the other group from the other end face of the rod filter. The structured surface portion is formed for example by knurling.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Stabfilter mit den Merkmalen des Anspruchs 1 und das erfindungsgemäße Brennstoffeinspritzventil mit den Merkmalen des Anspruchs 11 haben demgegenüber den Vorteil, dass die Partikel dem Zerteilungsbereich zugeführt werden, wobei auf Grund der reduzierten Spaltbreite, die den Strömungsquerschnitt im Zerteilungsbereich vorgibt, die Zerteilungswirkung im Zerteilungsbereich verbessert ist. Der Zerteilungsbereich kann sich unmittelbar an den ersten Abschnitt anschließen oder auch etwas beabstandet zum ersten Abschnitt angeordnet sein.The rod filter according to the invention with the features of claim 1 and the fuel injection valve according to the invention with the features of claim 11 have the advantage that the particles are supplied to the dicing area, wherein due to the reduced gap width, which dictates the flow cross-section in the dicing, the dewatering effect in the ditching is improved. The dicing region may adjoin the first section directly or may be arranged slightly spaced from the first section.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen des im Anspruch 1 angegebenen Stabfilters und des im Anspruch 11 angegebenen Brennstoffeinspritzventils möglich.The measures listed in the dependent claims advantageous refinements of the specified in claim 1 rod filter and the fuel injection valve specified in claim 11 are possible.

Der Grundkörper des Stabfilters weist an seiner Oberfläche ein oder mehrere Zerteilungsbereiche auf. In vorteilhafter Weise ist die Oberfläche des Grundkörpers zumindest im Zerteilungsbereich strukturiert. Solch eine Strukturierung kann durch eine Rändelung, durch Einkerbungen, durch Einprägungen oder auf andere Weise erzeugt sein. Vorzugsweise ist im Zerteilungsbereich eine Vielzahl von Zerteilungskanten vorgesehen, die beispielsweise an einer Vielzahl von pyramidenförmigen Erhebungen ausgebildet sind. Durch eine im Zerteilungsbereich vorgesehene Pyramidenstruktur werden die im Brennstoff mitgeführten Partikel besonders wirksam zerteilt. Bei der Zerteilung werden vorzugsweise relativ große Partikel zerhakt oder auf andere Weise zerkleinert. Relativ kleine Partikel können zusätzlich zerkleinert werden. Die das Stabfilter passierenden, zumindest teilweise zerkleinerten Partikel sind klein genug, dass ein Ausspülen über das Brennstoffeinspritzventil im normalen Betrieb möglich ist.The main body of the rod filter has on its surface one or more dicing areas. Advantageously, the surface of the base body is structured at least in the dicing area. Such structuring may be produced by knurling, indentations, impressions or otherwise. Preferably, a plurality of dicing edges is provided in the dicing area, which are formed for example on a plurality of pyramidal elevations. By means of a pyramid structure provided in the dividing region, the particles entrained in the fuel are broken up particularly effectively. When dividing, relatively large particles are preferably chopped up or otherwise comminuted. Relatively small particles can be crushed additionally. The particles passing through the rod filter, at least partially comminuted, are small enough that flushing out via the fuel injection valve is possible during normal operation.

Ferner ist es vorteilhaft, dass sich der Querschnitt des Grundkörpers im Zerteilungsbereich in der Strömungsrichtung vergrößert. Dadurch werden zunächst relativ große Partikel zerteilt und mit abnehmendem Strömungsquerschnitt, der durch die Vergrößerung des Querschnitts des Grundkörpers in Strömungsrichtung bedingt ist, wird eine weitere Zerteilung von Partikeln ermöglicht.Furthermore, it is advantageous that the cross section of the main body in the dicing area increases in the flow direction. This will initially be relatively large particles divided and with decreasing flow cross-section, which is due to the enlargement of the cross section of the body in the flow direction, a further division of particles is made possible.

In vorteilhafter Weise ist der Grundkörper ellipsoidförmig ausgestaltet, wodurch die Partikelverkleinerung weiter verbessert ist. Der Zerteilungsbereich ist vorzugsweise in einem mittleren Bereich des Grundkörpers vorgesehen, in dem der Grundkörper einen relativ großen Querschnitt aufweist, so dass der in Bezug auf einen Brennstoffeinlasskanal verbleibende Spalt relativ klein ist.Advantageously, the base body is designed ellipsoidal, whereby the particle reduction is further improved. The dicing region is preferably provided in a middle region of the base body, in which the base body has a relatively large cross section, so that the gap remaining with respect to a fuel inlet channel is relatively small.

Zur Befestigung des Stabfilters ist in vorteilhafter Weise zumindest eine mit dem Grundkörper verbundene Befestigungseinrichtung vorgesehen, die gegeneinander verdrehte Befestigungsstege aufweist. Beispielsweise kann eine Befestigungseinrichtung drei um jeweils 120° versetzt zueinander angeordnete Befestigungsstege aufweisen.For attachment of the rod filter, at least one fastening device connected to the main body is advantageously provided, which has mutually twisted fastening webs. For example, a fastening device may have three fixing webs which are offset by 120 ° relative to one another.

Das Stabfilter eignet sich besonders zum Filtern von Brennstoff, der unter hohem Druck durch eine Brennstoffleitung geführt ist. Bei einem Druckpuls, der beispielsweise durch das Öffnen und Schließen eines Brennstoffeinspritzventils oder durch eine an der Brennstoffleitung vorgesehene Druckerzeugungseinrichtung erzeugt wird, wird vorzugsweise eine elastische Verformung des Grundkörpers und/oder eine elastische Verformung der Brennstoffleitung bewirkt, so dass der im Bereich des Zerteilungsbereichs des Stabfilters zwischen dem Grundkörper und der Brennstoffleitung vorhandene Strömungsquerschnitt variiert wird. Dadurch kommt es zu einer vorteilhaften Zerhackung der im Brennstoff mitgeführten Partikel.The rod filter is particularly suitable for filtering fuel that is passed under high pressure through a fuel line. In the case of a pressure pulse which is generated, for example, by the opening and closing of a fuel injection valve or by a pressure generating device provided on the fuel line, preferably an elastic deformation of the base body and / or an elastic deformation of the fuel line is effected, so that in the region of the dicing region of the rod filter between the main body and the fuel line existing flow cross section is varied. This results in an advantageous chopping of the particles entrained in the fuel.

Zeichnungdrawing

Bevorzugte Ausführungsbeispiele der Erfindung sind in der nachfolgenden Beschreibung anhand der beigefügten Zeichnungen, in denen sich entsprechende Elemente mit übereinstimmenden Bezugszeichen versehen sind, näher erläutert. Es zeigt:

  • Fig. 1 ein erstes Ausführungsbeispiel eines erfindungsgemäßen Stabfilters, das in einem Brennstoffeinlasskanal eines Brennstoffeinspritzventils angeordnet ist;
  • Fig. 2 ein in einem Brennstoffeinlasskanal angeordnetes Stabfilter gemäß einem zweiten Ausführungsbeispiel der Erfindung und
  • Fig. 3 den in Fig. 1 mit III bezeichneten Schnitt durch das in einem Brennstoffeinlasskanal angeordnete Stabfilter in einer teilweisen Schnittdarstellung.
Preferred embodiments of the invention are explained in more detail in the following description with reference to the accompanying drawings, in which corresponding elements are provided with corresponding reference numerals. It shows:
  • Fig. 1 a first embodiment of a rod filter according to the invention, which is arranged in a fuel inlet passage of a fuel injection valve;
  • Fig. 2 a arranged in a fuel inlet duct rod filter according to a second embodiment of the invention and
  • Fig. 3 the in Fig. 1 III with a section through the arranged in a fuel inlet duct rod filter in a partial sectional view.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Fig. 1 zeigt ein erstes Ausführungsbeispiel eines Stabfilters 1 der Erfindung, das in einem Brennstoffeinlasskanal 2 eines teilweise dargestellten Brennstoffeinlassstutzens 3 eines Brennstoffeinspritzventils angeordnet ist. Das Stabfilter 1 dient insbesondere für Injektoren von Brennstoffeinspritzanlagen von luftverdichtenden, selbstzündenden Brennkraftmaschinen, bei denen ein unter hohem Druck stehender Brennstoff durch das Stabfilter 1 gefiltert wird. Ein bevorzugter Einsatz des Stabfilters 1 besteht für eine Brennstoffeinspritzanlage mit einem Common-Rail, das Dieselbrennstoff unter hohem Druck zu mehreren Brennstoffeinspritzventilen führt. Das erfindungsgemäße Stabfilter 1 und das erfindungsgemäße Brennstoffeinspritzventil eignen sich jedoch auch für andere Anwendungsfälle. Fig. 1 shows a first embodiment of a rod filter 1 of the invention, which is arranged in a fuel inlet channel 2 of a partially shown fuel inlet nozzle 3 of a fuel injection valve. The rod filter 1 is used in particular for injectors of fuel injection systems of air-compressing, self-igniting internal combustion engines, in which a fuel under high pressure is filtered through the rod filter 1. A preferred use of the rod filter 1 is for a fuel injection system with a common rail, the diesel fuel under high pressure leads to multiple fuel injectors. However, the rod filter 1 according to the invention and the fuel injection valve according to the invention are also suitable for other applications.

Das Stabfilter 1 weist einen Grundkörper 4 auf, der als ellipsoidförmiger Grundkörper 4 ausgestaltet ist. Ferner weist das Stabfilter 1 eine erste Befestigungseinrichtung 5 und eine zweite Befestigungseinrichtung 6 auf, wobei die erste Befestigungseinrichtung 5 drei um 120° versetzt zueinander angeordnete Befestigungsstege 7, 8 umfasst und die zweite Befestigungseinrichtung 6 drei zueinander um 120° versetzt angeordnete Befestigungsstäbe 9, 10 umfasst. In Bezug auf eine Strömungsrichtung 11 einer Brennstoffströmung sind die Befestigungsstäbe 7, 8 der ersten Befestigungseinrichtung 5 um 60° verdreht zu den Befestigungsstäben 9, 10 der zweiten Befestigungseinrichtung 6 angeordnet, wodurch sich eine vorteilhafte Beeinflussung der Brennstoffströmung ergibt.The rod filter 1 has a base body 4, which is configured as an ellipsoidal base body 4. Furthermore, the bar filter 1 has a first fastening device 5 and a second fastening device 6, wherein the first fastening device 5 comprises three fixing webs 7, 8 offset by 120 ° to one another and the second fastening device 6 comprises three fastening rods 9, 10 arranged offset from one another by 120 ° , With respect to a flow direction 11 of a fuel flow, the fastening rods 7, 8 of the first fastening device 5 are rotated by 60 ° relative to the fastening rods 9, 10 of the second fastening device 6, resulting in an advantageous influencing of the fuel flow.

Der Grundkörper 4 des Stabfilters 1 weist an einer Oberfläche 12 einen Zerteilungsbereich 13 auf. Der Zerteilungsbereich 13 weist dabei die Gestalt eines Streifens mit der Breite B auf, wobei der Zerteilungsbereich 13 in einem mittleren Bereich des Grundkörpers 4 vorgesehen ist, in dem ein Abstand A zwischen dem Brennstoffeinlasskanal 2 und der Oberfläche 12 des Grundkörpers 4 relativ klein ist. Durch den Abstand A ist ein Ringspalt vorgegeben, der einen minimalen Strömungsquerschnitt für die in der Strömungsrichtung 11 fließende Brennstoffströmung definiert. Durch die ellipsoidförmige Form des Grundkörpers 4 wird die Brennstoffströmung an den Zerteilungsbereich 13 geführt und zum Zerteilungsbereich 13 hin beschleunigt.The main body 4 of the rod filter 1 has a dicing region 13 on a surface 12. In this case, the dicing region 13 has the shape of a strip with the width B, wherein the dicing region 13 is provided in a middle region of the base body 4, in which a distance A between the fuel inlet channel 2 and the surface 12 of the base body 4 is relatively small. The distance A defines an annular gap which defines a minimum flow cross-section for the fuel flow flowing in the flow direction 11. Due to the ellipsoidal shape of the base body 4 is the Fuel flow led to the dicing area 13 and accelerated to the dicing area 13 out.

Die Brennstoffströmung erfolgt in der Regel nicht kontinuierlich, sondern wird mit dem Öffnen und Schließen des Brennstoffeinspritzventils gepulst. Dabei kann auf der Seite des Common-Rails ein periodischer Druckaufbau erfolgen oder kontinuierlich ein hoher Druck anliegen, der über das Schalten des Brennstoffeinspritzventils zu Druckpulsationen führt. Durch die Druckpulsationen des Brennstoffs kommt es zu einer elastischen Verformung des Brennstoffeinlassstutzens 3 und/oder des Grundkörpers 4 des Stabfilters 1, so dass der Abstand A mit den Druckpulsationen variiert. In dem Brennstoff enthaltene Partikel, die dem Zerteilungsbereich 13 zugeführt werden, werden dadurch im Zerteilungsbereich 13 zerteilt. Hierfür weist die Oberfläche 12 des Grundkörpers 4 zumindest im Zerteilungsbereich 13 eine Pyramidenstruktur auf, die anhand der Fig. 3 im Detail beschrieben ist. In dem in Fig. 1 dargestellten Ausführungsbeispiel ist die Pyramidenstruktur über die gesamte Oberfläche 12 des Grundkörpers 4 ausgeführt.The fuel flow is usually not continuous, but is pulsed with the opening and closing of the fuel injector. In this case, a periodic pressure build-up can take place on the side of the common rail or a high pressure can be present continuously, which leads to pressure pulsations via the switching of the fuel injection valve. The pressure pulsations of the fuel result in an elastic deformation of the fuel inlet nozzle 3 and / or of the main body 4 of the rod filter 1, so that the distance A varies with the pressure pulsations. Particles contained in the fuel, which are supplied to the dicing area 13, are thereby divided into the dicing area 13. For this purpose, the surface 12 of the base body 4, at least in the dicing region 13 a pyramidal structure, based on the Fig. 3 is described in detail. In the in Fig. 1 illustrated embodiment, the pyramidal structure over the entire surface 12 of the base body 4 is executed.

Zur Veranschaulichung der Erfindung sind in der Fig. 1 Bahnen 14, 15, 16 von den in dem Brennstoff enthaltenen Partikeln dargestellt, die im Zerteilungsbereich 13 zwischen der Oberfläche 12 und dem Brennstoffeinlasskanal 2 zerhackt werden.To illustrate the invention are in the Fig. 1 Traces 14, 15, 16 represented by the particles contained in the fuel, which are chopped in the dicing region 13 between the surface 12 and the fuel inlet channel 2.

Fig. 2 zeigt ein Stabfilter 1, das in einen Brennstoffeinlasskanal 2 eines Brennstoffeinlassstutzens 3 eines Brennstoffeinspritzventils angeordnet ist, entsprechend einem zweiten Ausführungsbeispiel der Erfindung. In diesem Ausführungsbeispiel weist der Grundkörper 4 ein erstes Endstück 21, ein zweites Endstück 22 und ein Zwischenstück 23 auf, das das erste Endstück 21 mit dem zweiten Endstück 22 verbindet. Die Endstücke 21, 22 sind jeweils ellipsoidhalbkörperförmig ausgestaltet, so dass sie jeweils die Hälfte eines Ellipsoidkörpers bilden. Das Zwischenstück 23 ist zylinderförmig ausgestaltet. Der Zerteilungsbereich 13 ist an der Oberfläche 12 des Zwischenstücks 23 des Grundkörpers 4 vorgesehen, wobei die Oberfläche 12 an den Endstücken 21, 22 im Wesentlichen glatt ist. Abgesehen von der durch die pyramidenförmige Struktur des Zerteilungsbereichs 13 vorgegebene Strukturierung der Oberfläche 12 an dem Zwischenstück 23 ist der durch den Abstand A gegebene Strömungsquerschnitt über die Breite B des Zwischenstückes 23 im Wesentlichen konstant. Allerdings variiert der Abstand A zwischen dem Zerteilungsbereich 13 und dem Brennstoffeinlasskanal 2 mit den Druckpulsationen, die durch den Brennstoff vermittelt sind. Innerhalb des Zerteilungsbereichs 13 kommt es zu einer wirksamen Zerteilung der über die ellipsoidförmige Ausgestaltung des ersten Endstücks 21 an das Zwischenstück 23 geführten Partikel. Dies ist in der Fig. 2 durch die Partikelbahnen 14, 15 veranschaulicht. Die Pyramidenstruktur im Zerteilungsbereich 13 kann beispielsweise durch eine Vielzahl von Einprägungen ausgestaltet sein, wobei die Einprägungen beispielsweise durch V-förmige Nuten einer Stärke gebildet sind, bei der eine Vielzahl von Spitzen entsteht, wie es anhand der Fig. 3 in weiterem Detail dargestellt ist. In Bezug auf die Strömungsrichtung 11 können die Einprägungen unter einem Winkel von 45° an der Oberfläche 12 des Grundkörpers 4 vorgesehen sein. Fig. 2 shows a rod filter 1, which is arranged in a fuel inlet channel 2 of a fuel inlet nozzle 3 of a fuel injection valve, according to a second embodiment of the invention. In this embodiment, the base body 4 has a first End piece 21, a second end piece 22 and an intermediate piece 23 which connects the first end piece 21 with the second end piece 22. The end pieces 21, 22 are each ellipsoidhalbkörperförmig configured so that they each form half of an ellipsoidal body. The intermediate piece 23 is cylindrical. The dicing area 13 is provided on the surface 12 of the intermediate piece 23 of the main body 4, the surface 12 being substantially smooth on the end pieces 21, 22. Apart from the predetermined by the pyramidal structure of the dicing region 13 structuring of the surface 12 at the intermediate piece 23 of the given by the distance A flow cross-section over the width B of the intermediate piece 23 is substantially constant. However, the distance A between the dicing area 13 and the fuel inlet passage 2 varies with the pressure pulsations imparted by the fuel. Within the dicing region 13, there is an effective division of the particles guided over the ellipsoidal configuration of the first end piece 21 to the intermediate piece 23. This is in the Fig. 2 illustrated by the particle webs 14, 15. The pyramidal structure in the dicing region 13 can be configured, for example, by a plurality of indentations, the indentations being formed, for example, by V-shaped grooves of a thickness in which a multiplicity of points are formed, as is apparent from FIGS Fig. 3 is shown in more detail. With respect to the flow direction 11, the indentations may be provided at an angle of 45 ° to the surface 12 of the main body 4.

Fig. 3 zeigt einen Teilschnitt entlang der in Fig. 1 mit III bezeichneten Schnittlinie in einer Blickrichtung, die entgegengesetzt zu der Strömungsrichtung 11 ist. Der Befestigungssteg 7 der ersten Befestigungseinrichtung 5 liegt an dem Brennstoffeinlasskanal 2 des Brennstoffeinlassstutzens 3 an. Entsprechend liegen auch die übrigen Befestigungsstege der Befestigungseinrichtungen 5, 6 an dem Brennstoffeinlasskanal 2 des Brennstoffeinlassstutzens 3 an. Die Befestigungseinrichtungen 5, 6 können dabei in dem Brennstoffeinlassstutzen 3 eingepresst sein, um eine zuverlässige Befestigung des Stabfilters 1 in dem Brennstoffeinlassstutzen 3 zu ermöglichen. Fig. 3 shows a partial section along the in Fig. 1 with III designated cutting line in a viewing direction, the opposite to the flow direction 11 is. The fastening web 7 of the first fastening device 5 bears against the fuel inlet channel 2 of the fuel inlet nozzle 3. Correspondingly, the remaining fastening webs of the fastening devices 5, 6 abut against the fuel inlet channel 2 of the fuel inlet nozzle 3. The fastening devices 5, 6 can be pressed in the fuel inlet 3, in order to allow a reliable attachment of the rod filter 1 in the fuel inlet 3.

Zumindest im Zerteilungsbereich 13 weist der Grundkörper 4 eine Pyramidenstruktur auf, die eine Vielzahl von pyramidenförmigen Erhebungen 24 bis 32 umfasst. Dabei hat eine Spitze 33 der Erhebung 24 einen Abstand A von dem Brennstoffeinlasskanal 2. Auf Grund der oidförmigen Ausgestaltung des Grundkörpers 4 ist ein Abstand A' einer Spitze 34 der pyramidenförmigen Erhebung 29 größer als der Abstand A. Da die von dem Brennstoff transportierten Partikel zunächst die pyramidenförmige Erhebung 34 erreichen, ist ein weitergehendes Zerteilen von zunächst relativ großen Partikeln möglich. Das Zerteilen der Partikel erfolgt dabei im Wesentlichen mittels Kanten 35, 36 der pyramidenförmigen Erhebung 24 und weiterer (in der Fig. 3 nicht bezeichneter) Kanten der Erhebungen 25 bis 32. Eine Zerteilung der an den Kanten 35, 36 vorbeiströmenden Partikel ist bereits auf Grund der durch den gepulsten Brennstofffluss vermittelten ruckartigen Bewegung der Partikel möglich. Außerdem ist auch eine elastische Ausgestaltung des Grundkörpers 4 und/oder eine elastische Ausgestaltung des Brennstoffeinlassstutzens 3 möglich, die eine Variation des Abstands A und des Abstands A in Bezug auf die Druckpulsationen des Brennstoffes ermöglicht. Dadurch kann speziell ein Zerhacken der Partikel erreicht werden. Es ist anzumerken, dass die Geometrie und die Anzahl der pyramidenförmigen Erhebungen 24 bis 32 in der Fig. 3 zur Erläuterung der Erfindung vereinfacht dargestellt ist. Speziell kann eine erheblich größere Anzahl an nebeneinander angeordneten pyramidenförmigen Erhebungen 24 bis 27 sowie nebeneinander angeordneter pyramidenförmiger Erhebungen 28 bis 32 vorgesehen sein. Außerdem ist über die Breite B des Zerteilungsbereichs 13 eine mehr oder weniger ausgeprägte Variation des Abstandes A beziehungsweise A' möglich. Außerdem können die Erhebungen 24 bis 32 auch eine andere Ausgestaltung haben, insbesondere ist eine pyramidenstumpfförmige Ausgestaltung möglich. Ferner ist die Strukturierung des Zerteilungsbereichs 13 durch spanende oder spanlose Verfahren, insbesondere durch Prägen, möglich.At least in the dicing area 13, the main body 4 has a pyramidal structure which comprises a large number of pyramidal elevations 24 to 32. In this case, a tip 33 of the elevation 24 has a distance A from the fuel inlet channel 2. Due to the oidförmigen design of the base body 4, a distance A 'a tip 34 of the pyramidal elevation 29 is greater than the distance A. Since the particles transported by the fuel first reach the pyramidal elevation 34, a further division of initially relatively large particles is possible. The division of the particles takes place essentially by means of edges 35, 36 of the pyramidal elevation 24 and further (in the Fig. 3 not designated) edges of the elevations 25 to 32. A division of the passing past the edges 35, 36 particles is already possible because of the mediated by the pulsed fuel flow jerky movement of the particles. In addition, an elastic configuration of the base body 4 and / or an elastic configuration of the fuel inlet nozzle 3 is possible, which allows a variation of the distance A and the distance A with respect to the pressure pulsations of the fuel. This can specifically chop up the particles be achieved. It should be noted that the geometry and the number of pyramidal elevations 24 to 32 in the Fig. 3 to simplify the explanation of the invention. Specifically, a significantly larger number of juxtaposed pyramidal elevations 24 to 27 and juxtaposed pyramidal elevations 28 to 32 may be provided. In addition, over the width B of the dicing region 13, a more or less pronounced variation of the distance A or A 'is possible. In addition, the elevations 24 to 32 may also have a different configuration, in particular a truncated pyramidal configuration is possible. Furthermore, the structuring of the dicing region 13 is possible by cutting or non-cutting methods, in particular by embossing.

Die Erfindung ist nicht auf die beschriebenen Ausführungsbeispiele beschränkt.The invention is not limited to the described embodiments.

Claims (12)

  1. Stick filter (1) for fuel injection valves, in particular for injectors for fuel injection systems of air-compressing auto-ignition internal combustion engines, with a basic body (4), characterized in that the basic body (4) has on a surface (12) at least one superficially structured splitting-up region (13) which is configured for splitting up particles flowing over the splitting-up region (13) of the basic body (4), and in that, at least in a first portion, a cross section of the basic body (4) is enlarged in a flow direction (11) to reduce a flow cross section provided for a fuel flow, and in that the splitting-up region (13) follows the first portion with respect to the flow direction (11).
  2. Stick filter according to Claim 1, characterized in that at least one splitting-up edge (35, 36) is provided in the splitting-up region (13).
  3. Stick filter according to Claim 1 or 2, characterized in that a multiplicity of splitting-up edges (35, 36) are provided.
  4. Stick filter according to one of Claims 1 to 3, characterized in that the basic body (4) has in the splitting-up region (13) a pyramid structure which comprises a multiplicity of pyramidal elevations (24-32).
  5. Stick filter according to one of Claims 1 to 4, characterized in that the cross section of the basic body (4) is enlarged, at least in portions, in the flow direction (11) in the splitting-up region (13).
  6. Stick filter according to one of Claims 1 to 5, characterized in that the basic body (4) has an at least essentially ellipsoidal configuration.
  7. Stick filter according to one of Claims 1 to 6, characterized in that the basic body (4) has a first end piece (21), a second end piece (22) and at least one intermediate piece (23), in that the first end piece (21) has a semi-ellipsoidal configuration, in that the second end piece (22) has a semi-ellipsoidal configuration, in that the intermediate piece (23) has an at least essentially cylindrical configuration, and in that the splitting-up region (13) is provided at least on the intermediate piece (23).
  8. Stick filter according to Claim 7, characterized in that the cylindrical intermediate piece (23) connects the first end piece (21) to the second end piece (22).
  9. Stick filter according to one of Claims 1 to 8, characterized in that at least one fastening device (5, 6) connected to the basic body (4) is provided, which has fastening webs (7, 8; 9, 10) twisted with respect to one another.
  10. Stick filter according to Claim 9, characterized in that a first fastening device (5) is connected to a first end piece (21) of the basic body (4), and in that a second fastening device (6) is connected to a second end piece (22).
  11. Fuel injection valve, in particular injector for fuel injection systems of air-compressing auto-ignition internal combustion engines, with a fuel inlet connection piece (3), which has a fuel inlet duct (2), and with a stick filter (1) according to one of Claims 1 to 10 which is arranged in the fuel inlet duct (2) of the fuel inlet connection piece (3).
  12. Fuel injection valve according to Claim 11, characterized in that the fuel inlet connection piece (3) is configured such that a pulsed supply of fuel which is under high pressure is made possible, and in that the splitting-up region (13) of the stick filter (1) cooperates with the fuel inlet duct (2) such that, by means of a pressure pulse, a temporary enlargement of a flow cross section between the fuel inlet duct (2) and the splitting-up region (13) of the stick filter (1) and a subsequent reduction in the flow cross section as a result of an elastic deformation of the basic body (4) and/or of the fuel inlet duct (2) are made possible for the purpose of splitting up the particles.
EP06122398A 2005-12-12 2006-10-17 Edge filter Not-in-force EP1795743B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005059164A DE102005059164A1 (en) 2005-12-12 2005-12-12 rod filter

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EP1795743A1 EP1795743A1 (en) 2007-06-13
EP1795743B1 true EP1795743B1 (en) 2009-12-23

Family

ID=37685042

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06122398A Not-in-force EP1795743B1 (en) 2005-12-12 2006-10-17 Edge filter

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EP (1) EP1795743B1 (en)
AT (1) ATE453047T1 (en)
DE (2) DE102005059164A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10967322B2 (en) 2013-03-15 2021-04-06 Donaldson Company, Inc. Ovate tubular filter cartridges and filter systems using the same
US11931681B2 (en) 2013-03-04 2024-03-19 Donaldson Company, Inc. Air filter systems and methods of using the same

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4437927C2 (en) * 1994-10-24 1996-09-12 Bosch Gmbh Robert Solenoid valve-controlled fuel injection device with an injection nozzle for fuel injection into the combustion chamber of a diesel internal combustion engine
GB9911889D0 (en) * 1999-05-22 1999-07-21 Lucas Ind Plc Filter
US6536417B2 (en) * 2000-12-20 2003-03-25 Detroit Diesel Corporation Easy flow improved edge filter and fuel system
DE10307529A1 (en) * 2003-02-21 2004-09-02 Robert Bosch Gmbh Fuel filter for a motor vehicle's fuel injection system has a rod-shaped filter body guided on its ends in a supply channel
WO2006049598A1 (en) * 2004-10-28 2006-05-11 Robert Bosch Gmbh Fuel injector filter
DE102005025527A1 (en) * 2005-06-03 2006-12-07 Robert Bosch Gmbh Filter arrangement with a surface-structured rod filter

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11931681B2 (en) 2013-03-04 2024-03-19 Donaldson Company, Inc. Air filter systems and methods of using the same
US10967322B2 (en) 2013-03-15 2021-04-06 Donaldson Company, Inc. Ovate tubular filter cartridges and filter systems using the same
US11701609B2 (en) 2013-03-15 2023-07-18 Donaldson Company, Inc. Ovate tubular filter cartridges and filter systems using the same

Also Published As

Publication number Publication date
EP1795743A1 (en) 2007-06-13
DE102005059164A1 (en) 2007-06-21
ATE453047T1 (en) 2010-01-15
DE502006005722D1 (en) 2010-02-04

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