EP2596230B1 - Injection device having improved spray preparation - Google Patents

Injection device having improved spray preparation Download PDF

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Publication number
EP2596230B1
EP2596230B1 EP11724597.7A EP11724597A EP2596230B1 EP 2596230 B1 EP2596230 B1 EP 2596230B1 EP 11724597 A EP11724597 A EP 11724597A EP 2596230 B1 EP2596230 B1 EP 2596230B1
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EP
European Patent Office
Prior art keywords
spray
holes
hole
spray hole
spray holes
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EP11724597.7A
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German (de)
French (fr)
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EP2596230A1 (en
Inventor
Guenter Dantes
Bernd Krauss
Andreas Krause
Anja Melsheimer
Harald Lang
Martin Stahl
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP2596230A1 publication Critical patent/EP2596230A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
    • F02M61/1833—Discharge orifices having changing cross sections, e.g. being divergent
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
    • F02M61/1813—Discharge orifices having different orientations with respect to valve member direction of movement, e.g. orientations being such that fuel jets emerging from discharge orifices collide with each other
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
    • F02M61/1846—Dimensional characteristics of discharge orifices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1853—Orifice plates

Definitions

  • the present invention relates to an injection device for injecting fluid, in particular fuel, with an improved spray treatment.
  • Fuel injection devices are known in the prior art in various configurations. Injectors are often used in which a spray perforated disk is arranged at the injection-side end.
  • the injection holes provided in the spray perforated disk define u.a. the spray treatment during the injection of fuel.
  • Such spray perforated disks have proven themselves in principle; However, there is a continuing effort to further reduce fuel consumption and reduce pollutant emissions through improved spray treatment.
  • the injection device according to the invention for the injection of fluid, in particular fuel, having the features of claim 1 having the features of claim 1
  • an injection is carried out in such a way that the injected fluid is torn open at the outlet from the spray holes as widely as possible and in particular forms a partial hollow lamella in order to achieve a very good spray distribution.
  • This is inventively achieved in that at least a first and a second injection hole are arranged at a distance from each other, which is less than or equal to, as a twice the opening edge distance at the inflow side of the spray holes.
  • the opening edge distance is the distance which, when a straight line is formed at the inflow opening, has the maximum distance between two edge points of the inflow opening.
  • Further spray hole axes of the injection holes according to the invention are arranged in mutually different directions. As a result, a spray treatment in different directions is achieved at the outlet from the first and second spray hole, so that a relatively wide space area is covered with injected fluid. Furthermore, due to the relatively close arrangement of the first and second injection holes relative to one another, in particular the inflow at the two injection holes is positively influenced by the main inflows influencing each other in the two injection holes and causing a strong deflection on the inflow side of the injection holes.
  • the injection holes are thus intentionally not arranged at equal intervals along the circumference, but preferably in pairs with a small distance, so that a positive mutual influence of the flow of the two injection holes of the injection hole pair is achieved. It should be noted that the condition must be met even with two differently sized first and second spray holes, ie, the distance is defined by the largest opening edge distance of one of the injection holes.
  • the distance between the first and second injection hole is 0.5 times to 1.5 times the maximum opening edge spacing of the injection holes and more preferably the distance between the two injection holes corresponds approximately to the maximum opening edge spacing of the injection holes.
  • the spray hole axes of the first and second spray hole are arranged at different angles of inclination.
  • the angle of inclination is understood to mean an angle in which the injection-hole axis runs through a plane which encompasses the inflow opening.
  • the inclination angle of the injection hole axes are preferably in a range from 5 ° to 85 °, preferably 20 ° to 60 °, and the angles of inclination are more preferably approximately up to 40 °, and preferably approximately 40 °.
  • the spray holes of a spray hole pair each have a spray hole axis, which have the same angle of inclination, but are directed in different directions. As a result, essentially the same shape spray cone per injection hole can be achieved.
  • an even number of spray holes is provided, wherein in each case two of the spray holes are arranged in pairs, corresponding to the arrangement of the first and second spray holes.
  • This enables a particularly good spray treatment, wherein in particular a spray pattern with two spray guns can be produced in each case in the form of a cone, wherein each spray jet is generated by a plurality of spray holes.
  • an odd number of spray holes are provided, which preferably produce a spray pattern with only a single jet of spray in cone shape.
  • At least one of the injection holes has a widening shape, in particular a conically widening shape.
  • the spray-hole shape expands particularly preferably in the direction of flow.
  • one of the injection holes of a spray hole pair has a widening shape, whereby an additional widening of the spray is achieved and in particular form the individual spray jets shortly after exit a partial lamella and unite the individual partial lamellae into a spray jet in the cone shape.
  • both spray holes have an expanding shape, wherein the expanding shapes may be the same or different.
  • an inflow opening of a spray hole is circular or oval.
  • the maximum opening edge spacing on the inflow side corresponds to a diameter of the injection hole opening.
  • the maximum opening edge distance of a largest axis corresponds to one of the oval-shaped openings, in particular a main axis of an ellipse.
  • the first and second spray holes are arranged on a circumference and the injection hole axes are arranged at a hole pitch angle of 20 ° to 60 °, preferably 20 ° to 30 °, and preferably about 25 °.
  • the injection device further comprises a funnel-shaped inflow space, which is arranged on the inflow side of the injection holes.
  • a funnel-shaped inflow space Through this funnel-shaped inflow a relatively sharp deflection of the inflow fluid is achieved in the injection holes, which entails an increased turbulence of the fluid and contributes to improved spray conditioning.
  • a main flow of the fluid is supplied to each spray hole in an inflow angle, so that a sum of the inflow angle and an angle of the spray hole axis is less than or equal to 90 °.
  • the inflow angle between 40 ° and 60 °.
  • the injection device further comprises a third and a fourth injection hole, which are arranged at a distance which is less than or equal to a double maximum opening edge distance at the inflow side of the injection holes and the injection hole axes are arranged in mutually different directions. Furthermore, the third and fourth injection hole are arranged opposite the first and second injection hole.
  • the injection device comprises a fifth and a sixth injection hole, which are arranged opposite to each other and whose spray hole axes are arranged in different directions.
  • the fifth and sixth injection hole are arranged at a greater distance from adjacent spray holes than paired injection holes.
  • the injection holes are preferably arranged in a spray perforated disk.
  • the spray perforated disc can then be easily attached to the injector.
  • FIGS. 1 to 3 a fuel injection valve with a spray disk 2 according to a first embodiment of the invention described in detail.
  • the injection valve 1 comprises a spray perforated disk 2, which is arranged on a valve seat 4. Fuel is supplied for injection through an opening 4a in the valve seat 4 in a funnel-shaped, expanding inflow space 5 and guided there to the spray holes.
  • FIG. 2 is the flow of fuel to the spray holes indicated by the arrows A, B, C.
  • the spray perforated disk 2 comprises a total of six injection holes, namely a first injection hole 11, a second injection hole 12, a third injection hole 13, a fourth injection hole 14, a fifth injection hole 15 and a sixth injection hole 16.
  • first and the second injection hole 11, 12 and the third and the fourth injection hole 13, 14 arranged as a spray hole pair each relatively close to each other.
  • the injection holes 11,12,13, 14,15, 16 are cylindrical and all have the same diameter. In FIG. 1 is for clarity, only the first diameter D1 of the first Plotted injection hole and the diameter D2 of the second injection hole, wherein the cylindrical injection holes of each plan view of FIG. 1 appear oval-shaped.
  • a distance 3 between the first injection hole 11 and the second injection hole 12 corresponds to the diameter D1 or D2 of the two injection holes.
  • the first injection hole 11 and the second injection hole 12 are arranged relatively close to each other, whereby the flow on an inflow side 2 a of the spray hole 2 disc mutually influenced.
  • the spray holes can conically widen or taper or also have different diameters in the flow direction, wherein any combinations are possible.
  • FIG. 3 11 shows a sectional view through the first and second injection holes 11 and 12.
  • the reference numeral 11a designates a spray hole axis of the first injection hole 11
  • the reference character 12a designates a second injection hole axis of the second injection hole 12.
  • the first injection hole 11 and the second injection hole 12 are in different directions arranged and also have different angles of inclination.
  • the angle of inclination of the injection holes is in each case the one angle which forms the smallest angle on the inflow side 2a with a plane comprising the injection hole opening.
  • ⁇ is about 45 ° and ⁇ about 70 °.
  • FIGS. 1 and 3 the arrows C, the inflow of fuel to the spray holes 11, 12 shown.
  • the arrows C indicate the main flow direction of the fuel.
  • the fuel is supplied to the first injection hole 11 in an inflow angle ⁇ and at the second injection hole 12 in an inflow angle ⁇ .
  • a sum of the inclination angle ⁇ and the inflow angle ⁇ at the first injection hole 11 is about 85 ° and thus smaller than 90 °.
  • the sum of the inflow angle ⁇ and the inclination angle ⁇ at the second injection hole 12 is about 85 °. Because the sum of the angle of inclination and the inflow angle at each injection hole is less than 90 °, a relatively flat flow of the injection holes can be achieved. Further, how out FIG.
  • FIG. 1 is achieved by the close arrangement of the first and second spray hole 11, 12 a reinforced one-sided Lochanströmung for each injection hole.
  • the flows of the individual spray holes are indicated by the arrows, wherein the length of the arrows corresponds to the magnitude of the flow.
  • the main flow to the spray holes is marked with the letter C.
  • Lower inflowing fuel quantities are indicated by the arrows D and E.
  • a hole spacing angle ⁇ between the first injection hole 11 and the second injection hole 12 is about 25 °.
  • the hole spacing angle ⁇ is thereby defined by a center M of the spray perforated disk 2. All injection holes 11, 12, 13, 14, 5 and 16 lie on a common circumference K. Alternatively, the injection holes can not lie on a common circumference.
  • the paired arrangement of spray holes with a relatively small distance thus allows an increased one-sided spray hole flow.
  • this flow is particularly preferably counter to a direction of inclination of the spray hole, so that the smallest possible angle between the main flow of the spray hole and the spray hole axes is realized. This allows a very good fuel conditioning.
  • injection hole axes of the injection holes are arranged such that the spray jets generated do not meet in the injection space. This ensures the widest possible spread of the fuel droplets in the injection space without overlaps.
  • a thickness of the spray perforated disk 2 corresponds approximately to a diameter of the injection holes.
  • the main flow in the paired spray holes 11, 12 and 13, 14 is substantially in a central region from the outside of the injection hole pair.
  • the angle of the injection hole axis is different from the Hauptansfrömwinkel, resulting in an additional impact in the spray hole.
  • the jet generated by the injection hole is deformed more to a hollow cone, which further improves the fuel treatment.
  • the Spray hole angle ⁇ at the first injection hole about 45 ° and the main flow angle ⁇ is about 35 °.
  • the difference between the main flow angle ⁇ and the angle of inclination ⁇ is preferably equal to or greater than 10 °.
  • FIGS. 4 to 10 Plotted arrows on the spray holes indicate in each case the inclination directions of the injection holes, wherein the FIGS. 4 to 10 each represent a plan view of the inflow sides 2 a of the spray perforated disks 2.
  • a total of eight injection holes 11 to 18 are provided, wherein two pairs of spray holes 11, 12 and 13, 14 are arranged at a distance 3, which corresponds to a maximum opening edge distance of the injection holes on the inflow side.
  • the injection holes are cylindrical in this embodiment and due to the inclination form the cylindrical injection holes on the surface of the spray perforated disc ovals, so that the distance 3 corresponds to a longitudinal axis of the oval.
  • the centers of the injection holes 11 to 18 are all on a common circumference K. Furthermore, the injection directions of the injection holes are chosen such that only two directions are present. Here, in the paired spray holes 11 and 12 and 13 and 14, the injection directions are chosen such that they are opposite to each other (see. FIG. 4 ).
  • injection holes 11 to 16 are provided, wherein the fuel holes are also cylindrical.
  • the centers of the injection holes lie on a common circumference K.
  • the injection holes are inclined in mutually different directions, so that at the downstream side, as indicated by the arrows, fuel in various directions emerges.
  • injection holes 11 to 14 are arranged.
  • the injection holes are again on a circumference K and the opening directions of the injection holes are chosen so that the injection hole axes of the pairwise injection holes are directed by an angle ⁇ by about 140 ° opposite to each other.
  • all existing spray holes are arranged in pairs, resulting in a particularly good fuel processing.
  • FIG. 7 shown fifth embodiment corresponds essentially to the third embodiment of FIG. 5
  • the injection directions of the injection holes are directed in each case only in two directions. These directions are opposite each other by 180 °, of the six arranged spray holes four are arranged in two spray-hole pairs and the injection holes 11, 12 and 13, 14 are directed in opposite directions.
  • FIG. 8 Also shown sixth embodiment also has a total of six injection holes 11 to 16, wherein the injection holes 11 and 12 and 13 and 14 are each arranged at a distance 3 to each other.
  • the distance 3 is equal to twice the maximum opening edge distance of the injection holes 11, 12, 13, 14. Since the cylindrical injection holes are inclined in this embodiment again to the axial direction, the maximum opening edge distance is the major axis of the ovals of the injection holes.
  • the injection direction of all injection holes 11 to 16 is directed inwards, so that a high fuel concentration is obtained in a central region of an injection space.
  • FIG. 9 shown seventh embodiment corresponds substantially to the in FIG. 8 shown embodiment, wherein the injection directions of the injection holes 11 to 16 are different.
  • the injection direction of the injection holes 11 and 12 is directed outward.
  • FIG. 10 shows an eighth embodiment of the invention, which substantially the in FIG. 6 shown corresponds.
  • a distance 3 between the first and second injection hole 11, 12 and the third and fourth injection hole 13, 14 equal to a double opening edge distance of the injection holes 11, 12 and 13, 14.
  • the two spray-hole pairs each other arranged opposite and also the injection directions of the respective injection holes go substantially inward.
  • At least two spray holes form a spray hole pair, which is arranged at a maximum distance 3 of a double opening edge distance from each other.
  • the shape (circular shape, ellipse, etc.), the direction of the injection hole axis, the inclination angle of the injection hole axis, the inner shape (cylindrical, conical, tapered, etc.) of the injection holes can be chosen differently, with the spray holes of the spray hole pair the condition is that the distance 3 between the two spray holes is smaller than twice the maximum opening edge distance at the inflow side and the injection hole axes of the two injection holes are arranged in mutually different directions, to avoid that the generated fuel sprays overlap.

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

Description

Stand der TechnikState of the art

Die vorliegende Erfindung betrifft eine Einspritzvorrichtung zur Einspritzung von Fluid, insbesondere von Kraftstoff, mit einer verbesserten Spray-Aufbereitung.The present invention relates to an injection device for injecting fluid, in particular fuel, with an improved spray treatment.

Einspritzvorrichtungen für Kraftstoff sind aus dem Stand der Technik in unterschiedlichen Ausgestattungen bekannt. Häufig werden hierbei Einspritzventile verwendet, bei denen am einspritzseitigen Ende eine Spritzlochscheibe angeordnet ist. Die in der Spritzlochscheibe vorgesehenen Spritzlöcher definieren dabei u.a. die Spray-Aufbereitung bei der Einspritzung von Kraftstoff. Derartige Spritzlochscheiben haben sich grundsätzlich bewährt; jedoch gibt es ein fortgesetztes Bestreben, durch eine verbesserte Spray-Aufbereitung den Kraftstoffverbrauch weiter zu senken und die Schadstoffemissionen weiter zu reduzieren.Fuel injection devices are known in the prior art in various configurations. Injectors are often used in which a spray perforated disk is arranged at the injection-side end. The injection holes provided in the spray perforated disk define u.a. the spray treatment during the injection of fuel. Such spray perforated disks have proven themselves in principle; However, there is a continuing effort to further reduce fuel consumption and reduce pollutant emissions through improved spray treatment.

Aus der US 2006/0157595 A1 ist ein Einspritzventil bekannt, bei dem sich an den Einströmraum V1 eine im mittleren Bereich genapfte Spritzlochscheibe 10 anschließt, wodurch der Einströmraum V1 noch um das Volumen V2 vergrößert wird. In der Spritzlochscheibe 10 sind zwei Vierergruppen von Spritzlöchern 142 halbkreisartig angeordnet, die in ihrer jeweiligen Gruppe dicht beieinander liegen und ausschließlich von radial innen angeströmt werden. Die Spritzlochachsen der vier in Gruppen angeordneten Spritzlöcher verlaufen parallel zueinander.From the US 2006/0157595 A1 an injection valve is known, in which adjoins the inflow space V1 a perforated in the central region spray perforated disk 10, whereby the inflow space V1 is still increased by the volume V2. In the spray perforated disk 10 two groups of four spray holes 142 are arranged in a semicircle, which are close to each other in their respective group and are flowed exclusively by radially inward. The spray hole axes of the four spray holes arranged in groups run parallel to one another.

Offenbarung der ErfindungDisclosure of the invention

Die erfindungsgemäße Einspritzvorrichtung zur Einspritzung von Fluid, insbesondere Kraftstoff, mit den Merkmalen des Anspruchs 1 weist demgegenüber den Vorteil auf, dass eine verbesserte Spray-Aufbereitung möglich ist, wodurch ein Kraftstoffverbrauch und Schadstoffemissionen weiter reduziert werden können. Erfingdungsgemäß wird dabei eine Einspritzung derart vorgenommen, dass das eingespritzte Fluid am Austritt aus den Spritzlöchern möglichst breit aufgerissen wird und insbesondere eine Teilhohllamelle bildet, um eine sehr gute Spray-Verteilung zu erreichen. Dies wird erfindungsgemäß dadurch erreicht, dass wenigstens ein erstes und ein zweites Spritzloch in einem Abstand zueinander angeordnet sind, welcher kleiner oder gleich ist, wie ein zweifacher Öffnungsrandabstand an der Einströmseite der Spritzlöcher. Der Öffnungsrandabstand ist dabei der Abstand, welcher bei Anlegen einer Gerade an der Einströmöffnung den maximalen Abstand zwischen zwei Randpunkten der Einströmöffnung aufweist. Weiter sind erfindungsgemäß Spritzlochachsen der Spritzlöcher in zueinander unterschiedlichen Richtungen angeordnet. Hierdurch wird bei Austritt aus dem ersten und zweiten Spritzloch eine Spray-Aufbereitung in unterschiedlichen Richtungen erreicht, so dass ein relativ breiter Raumbereich mit eingespritztem Fluid überdeckt wird. Durch die erfindungsgemäße relativ nahe Anordnung des ersten und zweiten Spritzlochs zueinander wird ferner insbesondere die Einströmung an den beiden Spritzlöchern positiv beeinflusst, indem sich die Haupteinströmungen in die beiden Spritzlöcher gegenseitig beeinflussen und eine starke Umlenkung an der Einströmseite der Spritzlöcher hervorrufen. Erfindungsgemäß werden somit die Spritzlöcher absichtlich nicht mit gleichen Abständen entlang des Umfangs angeordnet, sondern vorzugsweise paarweise mit kleinem Abstand, so dass eine positive gegenseitige Beeinflussung der Anströmungen der beiden Spritzlöcher des Spritzlochpaares erreicht wird. Es sei angemerkt, dass die Bedingung auch bei zwei unterschiedlich großen ersten und zweiten Spritzlöchern erfüllt sein muss, d.h., der Abstand wird durch den größten Öffnungsrandabstand eines der Spritzlöcher definiert.The injection device according to the invention for the injection of fluid, in particular fuel, having the features of claim 1 In contrast, the advantage that an improved spray treatment is possible, whereby fuel consumption and pollutant emissions can be further reduced. According to the invention, an injection is carried out in such a way that the injected fluid is torn open at the outlet from the spray holes as widely as possible and in particular forms a partial hollow lamella in order to achieve a very good spray distribution. This is inventively achieved in that at least a first and a second injection hole are arranged at a distance from each other, which is less than or equal to, as a twice the opening edge distance at the inflow side of the spray holes. The opening edge distance is the distance which, when a straight line is formed at the inflow opening, has the maximum distance between two edge points of the inflow opening. Further spray hole axes of the injection holes according to the invention are arranged in mutually different directions. As a result, a spray treatment in different directions is achieved at the outlet from the first and second spray hole, so that a relatively wide space area is covered with injected fluid. Furthermore, due to the relatively close arrangement of the first and second injection holes relative to one another, in particular the inflow at the two injection holes is positively influenced by the main inflows influencing each other in the two injection holes and causing a strong deflection on the inflow side of the injection holes. According to the invention, the injection holes are thus intentionally not arranged at equal intervals along the circumference, but preferably in pairs with a small distance, so that a positive mutual influence of the flow of the two injection holes of the injection hole pair is achieved. It should be noted that the condition must be met even with two differently sized first and second spray holes, ie, the distance is defined by the largest opening edge distance of one of the injection holes.

Die Unteransprüche zeigen bevorzugte Weiterbildungen der Erfindung.The dependent claims show preferred developments of the invention.

Besonders bevorzugt beträgt der Abstand zwischen dem ersten und zweiten Spritzloch das 0,5-fache bis 1,5-fache des maximalen Öffnungsrandabstands der Spritzlöcher und besonders bevorzugt entspricht der Abstand zwischen den beiden Spritzlöchern ungefähr dem maximalen Öffnungsrandabstand der Spritzlöcher.Particularly preferably, the distance between the first and second injection hole is 0.5 times to 1.5 times the maximum opening edge spacing of the injection holes and more preferably the distance between the two injection holes corresponds approximately to the maximum opening edge spacing of the injection holes.

Gemäß einer weiteren bevorzugten Ausgestaltung der vorliegenden Erfindung sind die Spritzlochachsen des ersten und zweiten Spritzloches in unterschiedlichen Neigungswinkeln angeordnet. Erfindungsgemäß wird dabei unter dem Neigungswinkel ein Winkel verstanden, in welchem die Spritzlochachse durch eine die Einströmöffnung umfassenden Ebene verläuft. Die Neigungswinkel der Spritzlochachsen liegen vorzugsweise in einem Bereich von 5° bis 85°, bevorzugt 20° bis 60°, und die Neigungswinkel sind besonders bevorzugt ungefähr bis zu 40°, und vorzugsweise ungefähr 40°.According to a further preferred embodiment of the present invention, the spray hole axes of the first and second spray hole are arranged at different angles of inclination. According to the invention, the angle of inclination is understood to mean an angle in which the injection-hole axis runs through a plane which encompasses the inflow opening. The inclination angle of the injection hole axes are preferably in a range from 5 ° to 85 °, preferably 20 ° to 60 °, and the angles of inclination are more preferably approximately up to 40 °, and preferably approximately 40 °.

Alternativ weisen die Spritzlöchern eines Spritzlochpaares jeweils eine Spritzlochachse auf, welche den gleichen Neigungswinkel aufweisen, jedoch in unterschiedliche Richtungen gerichtet sind. Hierdurch können im Wesentlichen gleich geformte Spray-Kegel pro Spritzloch erreicht werden.Alternatively, the spray holes of a spray hole pair each have a spray hole axis, which have the same angle of inclination, but are directed in different directions. As a result, essentially the same shape spray cone per injection hole can be achieved.

Besonders bevorzugt ist eine gerade Anzahl von Spritzlöchern vorgesehen, wobei jeweils zwei der Spritzlöcher paarweise, entsprechend der Anordnung des ersten und zweiten Spritzlochs, angeordnet sind. Dies ermöglicht eine besonders gute Spray-Aufbereitung, wobei insbesondere ein Spraybild mit zwei Spraystrahfen jeweils in Konusform erzeugbar ist, wobei jeder Spraystrahl durch mehrere Spritzlöcher erzeugt wird. Alternativ ist eine ungerade Anzahl vorn Spritzlöchern vorgesehen, welche vorzugsweise ein Spraybild mit nur einem einzigen Spraystrahl in Konusform erzeugten.Particularly preferably, an even number of spray holes is provided, wherein in each case two of the spray holes are arranged in pairs, corresponding to the arrangement of the first and second spray holes. This enables a particularly good spray treatment, wherein in particular a spray pattern with two spray guns can be produced in each case in the form of a cone, wherein each spray jet is generated by a plurality of spray holes. Alternatively, an odd number of spray holes are provided, which preferably produce a spray pattern with only a single jet of spray in cone shape.

Vorzugsweise weist wenigstens eines der Spritzlöcher eine sich erweiternde Form, insbesondere eine sich konisch erweiternde Form auf. Die Spritzlochform erweitert sich besonders bevorzugt in Durchströmungsrichtung. Somit ist es möglich, dass eines der Spritzlöcher eines Spritzlochpaares eine sich erweiternde Form aufweist, wodurch eine zusätzliche Aufweitung des Sprays erreicht wird und insbesondere die einzelnen Spraystrahlen kurz nach Austritt eine Teilhohllamelle bilden und sich die einzelnen Teilhohllamellen zu einem Spraystrahl in Konusform vereinigen. Besonders bevorzugt weisen beiden Spritzlöcher eine sich erweiternde Form auf, wobei die sich erweiternden Formen gleich oder auch unterschiedlich sein können.Preferably, at least one of the injection holes has a widening shape, in particular a conically widening shape. The spray-hole shape expands particularly preferably in the direction of flow. Thus, it is possible that one of the injection holes of a spray hole pair has a widening shape, whereby an additional widening of the spray is achieved and in particular form the individual spray jets shortly after exit a partial lamella and unite the individual partial lamellae into a spray jet in the cone shape. Particularly preferably, both spray holes have an expanding shape, wherein the expanding shapes may be the same or different.

Besonders bevorzugt ist eine Einströmöffnung eines Spritzlochs kreisrund oder oval. Bei kreisrunden Einströmöffnungen entspricht der maximale Öffnungsrandabstand an der Einströmseite einem Durchmesser der Spritzlochöffnung. Bei einer ovalförmigen Einströmöffnung entspricht der maximale Öffnungsrandabstand einer größten Achse einer der ovalförmigen Öffnungen, insbesondere einer Hauptachse einer Ellipse.Particularly preferably, an inflow opening of a spray hole is circular or oval. In the case of circular inflow openings, the maximum opening edge spacing on the inflow side corresponds to a diameter of the injection hole opening. In the case of an oval-shaped inflow opening, the maximum opening edge distance of a largest axis corresponds to one of the oval-shaped openings, in particular a main axis of an ellipse.

Vorzugsweise ist das erste und zweite Spritzloch auf einem Kreisumfang angeordnet und die Spritzlochachsen sind in einem Lochabstandswinkel von 20° bis 60°, bevorzugt 20° bis 30°, und vorzugsweise ungefähr 25°, angeordnet.Preferably, the first and second spray holes are arranged on a circumference and the injection hole axes are arranged at a hole pitch angle of 20 ° to 60 °, preferably 20 ° to 30 °, and preferably about 25 °.

Gemäß einer weiteren bevorzugten Ausgestaltung der vorliegenden Erfindung umfasst die Einspritzvorrichtung ferner einen trichterförmigen Einströmraum, welcher an der Einströmseite der Spritzlöcher angeordnet ist. Durch diesen trichterförmigen Einströmraum wird eine relativ scharfe Umlenkung des Einströmfluids in die Spritzlöcher erreicht, was eine verstärkte Verwirbelung des Fluids nach sich zieht und zu einer verbesserten Spray-Aufbereitung beiträgt. Vorzugsweise wird eine Hauptströmung des Fluids zu jedem Spritzloch in einem Einströmwinkel zugeführt, so dass eine Summe aus dem Einströmwinkel und einem Winkel der Spritzlochachse kleiner oder gleich 90° ist. Besonders bevorzugt ist der Einströmwinkel zwischen 40° und 60°.According to a further preferred embodiment of the present invention, the injection device further comprises a funnel-shaped inflow space, which is arranged on the inflow side of the injection holes. Through this funnel-shaped inflow a relatively sharp deflection of the inflow fluid is achieved in the injection holes, which entails an increased turbulence of the fluid and contributes to improved spray conditioning. Preferably, a main flow of the fluid is supplied to each spray hole in an inflow angle, so that a sum of the inflow angle and an angle of the spray hole axis is less than or equal to 90 °. Particularly preferred is the inflow angle between 40 ° and 60 °.

Bevorzugt umfasst die Einspritzvorrichtung ferner ein drittes und ein viertes Spritzloch, welche in einem Abstand zueinander angeordnet sind, der kleiner oder gleich wie ein zweifacher maximaler Öffnungsrandabstand an der Einströmseite der Spritzlöcher ist und deren Spritzlochachsen in zueinander unterschiedlichen Richtungen angeordnet sind. Weiterhin sind das dritte und vierte Spritzloch gegenüber dem ersten und zweiten Spritzloch angeordnet.Preferably, the injection device further comprises a third and a fourth injection hole, which are arranged at a distance which is less than or equal to a double maximum opening edge distance at the inflow side of the injection holes and the injection hole axes are arranged in mutually different directions. Furthermore, the third and fourth injection hole are arranged opposite the first and second injection hole.

Weiter bevorzugt umfasst die Einspritzvorrichtung ein fünftes und ein sechstes Spritzloch, welche einander gegenüberliegend angeordnet sind und deren Spritzlochachsen in unterschiedlichen Richtungen angeordnet sind. Dabei sind das fünfte und sechste Spritzloch in einer größeren Entfernung von benachbarten Spritzlöchern als paarweise angeordnete Spritzlöcher angeordnet.More preferably, the injection device comprises a fifth and a sixth injection hole, which are arranged opposite to each other and whose spray hole axes are arranged in different directions. In this case, the fifth and sixth injection hole are arranged at a greater distance from adjacent spray holes than paired injection holes.

Um eine möglichst einfache und kostengünstige Herstellbarkeit zu ermöglichen, sind die Spritzlöcher vorzugsweise in einer Spritzlochscheibe angeordnet. Die Spritzlochscheibe kann dann einfach an der Einspritzvorrichtung befestigt werden.In order to allow the simplest possible and cost-effective manufacturability, the injection holes are preferably arranged in a spray perforated disk. The spray perforated disc can then be easily attached to the injector.

Zeichnungdrawing

Nachfolgend werden unter Bezugnahme auf die begleitende Zeichnung bevorzugte Ausführungsbeispiele der Erfindung im Detail beschrieben. In der Zeichnung ist:

Figur 1
eine Draufsicht einer Spritzlochgeometrie eines Kraftstoffeinspritzventils gemäß einem ersten Ausführungsbeispiel der Erfindung,
Figur 2
eine Schnittansicht entlang der Linie II-II von Figur 1,
Figur 3
eine schematische Schnittansicht entlang der Linie III-III, und
Figur 4 bis 10
Draufsichten von Spritzlochgeometrien gemäß weiteren Ausführungsbeispielen der Erfindung.
Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings. In the drawing is:
FIG. 1
a top view of a spray hole geometry of a fuel injection valve according to a first embodiment of the invention,
FIG. 2
a sectional view taken along the line II-II of FIG. 1 .
FIG. 3
a schematic sectional view taken along the line III-III, and
FIGS. 4 to 10
Top views of injection hole geometries according to further embodiments of the invention.

Ausführungsformen der ErfindungEmbodiments of the invention

Nachfolgend wird-unter Bezugnahme auf die Figuren 1 bis 3 ein Kraftstoffeinspritzventil mit einer Spritzlochscheibe 2 gemäß einem ersten Ausführungsbeispiel der Erfindung im Detail beschrieben.Hereinafter - with reference to the FIGS. 1 to 3 a fuel injection valve with a spray disk 2 according to a first embodiment of the invention described in detail.

Wie aus der Schnittansicht von Figur 2 und 3 ersichtlich ist, umfasst das Einspritzventil 1 eine Spritzlochscheibe 2, welche an einem Ventilsitz 4 angeordnet ist. Kraftstoff wird für eine Einspritzung durch eine Öffnung 4a im Ventilsitz 4 in einen trichterförmigen, sich weitenden Einströmraum 5 zugeführt und dort zu den Spritzlöchern geführt. In Figur 2 ist die Strömung des Kraftstoffs zu den Spritzlöchern durch die Pfeile A, B, C angedeutet.As seen from the sectional view of FIGS. 2 and 3 it can be seen, the injection valve 1 comprises a spray perforated disk 2, which is arranged on a valve seat 4. Fuel is supplied for injection through an opening 4a in the valve seat 4 in a funnel-shaped, expanding inflow space 5 and guided there to the spray holes. In FIG. 2 is the flow of fuel to the spray holes indicated by the arrows A, B, C.

Wie aus Figur 1 ersichtlich ist, umfasst die Spritzlochscheibe 2 insgesamt sechs Spritzlöcher, nämlich ein erstes Spritzloch 11, ein zweites Spritzloch 12, ein drittes Spritzloch 13, ein viertes Spritzloch 14, ein fünftes Spritzloch 15 und ein sechstes Spritzloch 16. Dabei sind das erste und das zweite Spritzloch 11, 12 sowie das dritte und das vierte Spritzloch 13, 14 als Spritzlochpaar jeweils relativ nah zueinander angeordnet. Die Spritzlöcher 11,12,13, 14,15, 16 sind zylindrisch und weisen alle jeweils den gleichen Durchmesser auf. In Figur 1 ist aus Übersichtlichkeitsgründen lediglich der erste Durchmesser D1 des ersten Spritzlochs und der Durchmesser D2 des zweiten Spritzlochs eingezeichnet, wobei die zylindrischen Spritzlöcher jeder Draufsicht von Figur 1 ovalförmig erscheinen. Ein Abstand 3 zwischen dem ersten Spritzloch 11 und dem zweiten Spritzloch 12 entspricht dabei dem Durchmesser D1 bzw. D2 der beiden Spritzlöcher. Somit sind das erste Spritzloch 11 und das zweite Spritzloch 12 relativ nah beieinander angeordnet, wodurch sich die Strömung an einer Einströmseite 2a der Spritzlochscheibe 2 gegenseitig beeinflusst. Alternativ können sich die Spritzlöcher in Strömungsrichtung konisch aufweiten oder auch verjüngen oder auch unterschiedliche Durchmesser aufweisen, wobei beliebige Kombinationen möglich sind.How out FIG. 1 it can be seen, the spray perforated disk 2 comprises a total of six injection holes, namely a first injection hole 11, a second injection hole 12, a third injection hole 13, a fourth injection hole 14, a fifth injection hole 15 and a sixth injection hole 16. Here are the first and the second injection hole 11, 12 and the third and the fourth injection hole 13, 14 arranged as a spray hole pair each relatively close to each other. The injection holes 11,12,13, 14,15, 16 are cylindrical and all have the same diameter. In FIG. 1 is for clarity, only the first diameter D1 of the first Plotted injection hole and the diameter D2 of the second injection hole, wherein the cylindrical injection holes of each plan view of FIG. 1 appear oval-shaped. A distance 3 between the first injection hole 11 and the second injection hole 12 corresponds to the diameter D1 or D2 of the two injection holes. Thus, the first injection hole 11 and the second injection hole 12 are arranged relatively close to each other, whereby the flow on an inflow side 2 a of the spray hole 2 disc mutually influenced. Alternatively, the spray holes can conically widen or taper or also have different diameters in the flow direction, wherein any combinations are possible.

Figur 3 zeigt eine Schnittansicht durch das erste und zweite Spritzloch 11 und 12. Das Bezugszeichen 11a bezeichnet dabei eine Spritzlochachse des ersten Spritzlochs 11 und das Bezugszeichen 12a bezeichnet eine zweite Spritzlochachse des zweiten Spritzlochs 12. Das erste Spritzloch 11 und das zweite Spritzloch 12 sind in unterschiedlichen Richtungen angeordnet und weisen ferner unterschiedliche Neigungswinkel auf. Der Neigungswinkel der Spritzlöcher ist dabei jeweils derjenige Winkel, welcher an der Einströmseite 2a den kleinsten Winkel mit einer die Spritzlochöffnung umfassenden Ebene bildet. In Figur 3 ist der Neigungswinkel des ersten Spritzlochs mit α bezeichnet und der Neigungswinkel des zweiten Spritzlochs 12 mit β, wobei α ca. 45° beträgt und β ca. 70°. FIG. 3 11 shows a sectional view through the first and second injection holes 11 and 12. The reference numeral 11a designates a spray hole axis of the first injection hole 11 and the reference character 12a designates a second injection hole axis of the second injection hole 12. The first injection hole 11 and the second injection hole 12 are in different directions arranged and also have different angles of inclination. The angle of inclination of the injection holes is in each case the one angle which forms the smallest angle on the inflow side 2a with a plane comprising the injection hole opening. In FIG. 3 is the inclination angle of the first injection hole designated α and the inclination angle of the second injection hole 12 with β, where α is about 45 ° and β about 70 °.

Ferner ist in Figur 1 und 3 mit den Pfeilen C die Zuströmung des Kraftstoffs zu den Spritzlöchern 11, 12 dargestellt. Die Pfeile C deuten dabei die Hauptströmungsrichtung des Kraftstoffs an. Hierbei wird der Kraftstoff zum ersten Spritzloch 11 in einem Einströmwinkel γ zugeführt und am zweiten Spritzloch 12 in einem Einströmwinkel δ. Dabei ist eine Summe des Neigungswinkels α und des Einströmwinkels γ am ersten Spritzlochs 11 ca. 85° und somit kleiner als 90°. Die Summe des Einströmwinkels δ und des Neigungswinkels β am zweiten Spritzloch 12 ist ca. 85°. Dadurch, dass die Summe von Neigungswinkel und Einströmwinkel an jedem Spritzloch kleiner als 90° ist, kann eine relativ flache Anströmung der Spritzlöcher erreicht werden. Ferner, wie aus Figur 1 ersichtlich ist, wird durch die enge Anordnung des ersten und zweiten Spritzlochs 11, 12 eine verstärkte einseitige Lochanströmung für jedes Spritzloch erreicht. In Figur 1 sind die Anströmungen der einzelnen Spritzlöcher durch die Pfeile angedeutet, wobei die Länge der Pfeile der Stärke der Anströmung entspricht. Hierbei ist die Hauptanströmung zu den Spritzlöchern jeweils mit dem Buchstaben C gekennzeichnet. Geringere einströmende Kraftstoffmengen sind mit den Pfeilen D und E gekennzeichnet.Furthermore, in FIGS. 1 and 3 the arrows C, the inflow of fuel to the spray holes 11, 12 shown. The arrows C indicate the main flow direction of the fuel. In this case, the fuel is supplied to the first injection hole 11 in an inflow angle γ and at the second injection hole 12 in an inflow angle δ. Here, a sum of the inclination angle α and the inflow angle γ at the first injection hole 11 is about 85 ° and thus smaller than 90 °. The sum of the inflow angle δ and the inclination angle β at the second injection hole 12 is about 85 °. Because the sum of the angle of inclination and the inflow angle at each injection hole is less than 90 °, a relatively flat flow of the injection holes can be achieved. Further, how out FIG. 1 can be seen, is achieved by the close arrangement of the first and second spray hole 11, 12 a reinforced one-sided Lochanströmung for each injection hole. In FIG. 1 the flows of the individual spray holes are indicated by the arrows, wherein the length of the arrows corresponds to the magnitude of the flow. Here, the main flow to the spray holes is marked with the letter C. Lower inflowing fuel quantities are indicated by the arrows D and E.

Wie weiter aus Figur 1 ersichtlich ist, ist ein Lochabstandswinkel ε zwischen dem ersten Spritzloch 11 und dem zweiten Spritzloch 12 ca. 25°. Der Lochabstandswinkel ε wird dabei von einem Mittelpunkt M der Spritzlochscheibe 2 aus definiert. Alle Spritzlöcher 11, 12, 13, 14, 5 und 16 liegen dabei auf einem gemeinsamen Kreisumfang K. Alternativ können die Spritzlöcher auch nicht auf einem gemeinsamen Kreisumfang liegen.How farther FIG. 1 it can be seen, a hole spacing angle ε between the first injection hole 11 and the second injection hole 12 is about 25 °. The hole spacing angle ε is thereby defined by a center M of the spray perforated disk 2. All injection holes 11, 12, 13, 14, 5 and 16 lie on a common circumference K. Alternatively, the injection holes can not lie on a common circumference.

Die paarweise Anordnung von Spritzlöchern mit relativ geringem Abstand ermöglicht somit eine verstärkte einseitige Spritzlochanströmung. Besonders bevorzugt ist diese Anströmung dabei entgegen einer Neigungsrichtung des Spritzloches, so dass ein möglichst kleiner Winkel zwischen der Hauptanströmung des Spritzlochs und der Spritzlochachsen realisiert ist. Dies ermöglicht eine sehr gute Kraftstoffaufbereitung.The paired arrangement of spray holes with a relatively small distance thus allows an increased one-sided spray hole flow. In this case, this flow is particularly preferably counter to a direction of inclination of the spray hole, so that the smallest possible angle between the main flow of the spray hole and the spray hole axes is realized. This allows a very good fuel conditioning.

Ferner sei angemerkt, dass die Spritzlochachsen der Spritzlöcher derart angeordnet sind, dass sich die erzeugten Spray-Strahlen im Einspritzraum nicht treffen. Dies stellt eine möglichst weite Verbreitung der Kraftstofftröpfchen im Einspritzraum ohne Überschneidungen sicher. Eine Dicke der Spritzlochscheibe 2 entspricht dabei ungefähr einem Durchmesser der Spritzlöcher.It should also be noted that the injection hole axes of the injection holes are arranged such that the spray jets generated do not meet in the injection space. This ensures the widest possible spread of the fuel droplets in the injection space without overlaps. A thickness of the spray perforated disk 2 corresponds approximately to a diameter of the injection holes.

Wie weiter aus Figur 1 ersichtlich ist, ist die Hauptanströmung des fünften und sechsten Spritzlochs 15, 16 aufgrund der Neigung der Spritzlochachsen 15a und 16a nach innen sowie der Form des Einströmraums 5 hauptsächlich von außen. Im Gegensatz dazu ist die Hauptanströmung bei den paarweise angeordneten Spritzlöchern 11, 12 sowie 13, 14 im Wesentlichen in einem mittleren Bereich von der Außenseite des Spritzlochpaares. An den inneren Bereichen der Spritzlöcher ist eine relativ geringe Anströmung vorhanden. Weiterhin ist der Winkel der Spritzlochachse unterschiedlich zum Hauptansfrömwinkel, was zu einem zusätzlichen Prall im Spritzloch führt. Hierdurch wird der durch das Spritzloch erzeugte Strahl stärker zu einem Hohlkegel deformiert, was die Kraftstoffaufbereitung weiter verbessert. Beispielsweise beträgt der Spritzlochwinkel α am ersten Spritzloch ca. 45° und der Hauptanströmwinkel γ beträgt ca. 35°. Der Unterschied zuwischen dem Hauptanströmwinkel γ und dem Neigungswinkel α ist vorzugsweise gleich oder größer 10°.How farther FIG. 1 is apparent, the main flow of the fifth and sixth injection hole 15, 16 due to the inclination of the injection hole axes 15a and 16a inward and the shape of the inflow space 5 mainly from the outside. In contrast, the main flow in the paired spray holes 11, 12 and 13, 14 is substantially in a central region from the outside of the injection hole pair. At the inner areas of the injection holes a relatively small flow is present. Furthermore, the angle of the injection hole axis is different from the Hauptansfrömwinkel, resulting in an additional impact in the spray hole. As a result, the jet generated by the injection hole is deformed more to a hollow cone, which further improves the fuel treatment. For example, the Spray hole angle α at the first injection hole about 45 ° and the main flow angle γ is about 35 °. The difference between the main flow angle γ and the angle of inclination α is preferably equal to or greater than 10 °.

Nachfolgend werden weitere Ausführungsbeispiele unter Bezugnahme auf die Figuren 4 bis 10 im Detail beschrieben, wobei gleiche bzw. funktional gleiche Teile mit den gleichen Bezugszeichen wie im ersten Ausführungsbeispiel bezeichnet sind. Die in den Figuren 4 bis 10 eingezeichneten Pfeile an den Spritzlöchern geben dabei jeweils die Neigungsrichtungen der Spritzlöcher an, wobei die Figuren 4 bis 10 jeweils eine Draufsicht auf die Einströmseiten 2a der Spritzlochscheiben 2 darstellen.Hereinafter, further embodiments will be described with reference to FIGS FIGS. 4 to 10 described in detail, wherein identical or functionally identical parts are denoted by the same reference numerals as in the first embodiment. The in the FIGS. 4 to 10 Plotted arrows on the spray holes indicate in each case the inclination directions of the injection holes, wherein the FIGS. 4 to 10 each represent a plan view of the inflow sides 2 a of the spray perforated disks 2.

Bei dem in Figur 4 gezeigten zweiten Ausführungsbeispiel sind insgesamt acht Spritzlöcher 11 bis 18 vorgesehen, wobei zwei Paare von Spritzlöchern 11, 12 und 13, 14 mit einem Abstand 3 angeordnet sind, welcher einen maximalen Öffnungsrandabstand der Spritzlöcher an der Einströmseite entspricht. Wie aus Figur 4 ersichtlich ist, sind die Einspritzlöcher in diesem Ausführungsbeispiel zylindrisch ausgebildet und aufgrund der Neigung bilden die zylindrischen Spritzlöcher an der Oberfläche der Spritzlochscheibe Ovale, so dass der Abstand 3 einer Längsachse des Ovals entspricht.At the in FIG. 4 shown second embodiment, a total of eight injection holes 11 to 18 are provided, wherein two pairs of spray holes 11, 12 and 13, 14 are arranged at a distance 3, which corresponds to a maximum opening edge distance of the injection holes on the inflow side. How out FIG. 4 it can be seen, the injection holes are cylindrical in this embodiment and due to the inclination form the cylindrical injection holes on the surface of the spray perforated disc ovals, so that the distance 3 corresponds to a longitudinal axis of the oval.

Die Mittelpunkte der Spritzlöcher 11 bis 18 liegen alle auf einem gemeinsamen Kreisumfang K. Ferner sind die Spritzrichtungen der Spritzlöcher derart gewählt, dass lediglich zwei Richtungen vorhanden sind. Dabei sind bei den paarweise angeordneten Spritzlöchern 11 und 12 sowie 13 und 14 die Spritzrichtungen derart gewählt, dass sie einander entgegengesetzt sind (vgl. Figur 4).The centers of the injection holes 11 to 18 are all on a common circumference K. Furthermore, the injection directions of the injection holes are chosen such that only two directions are present. Here, in the paired spray holes 11 and 12 and 13 and 14, the injection directions are chosen such that they are opposite to each other (see. FIG. 4 ).

Beim dritten Ausführungsbeispiel von Figur 5 sind insgesamt sechs Spritzlöcher 11 bis 16 vorgesehen, wobei die Spritilöcher ebenfalls zylindrisch ausgebildet sind. Die Mittelpunkte der Spritzlöcher liegen auf einem gemeinsamen Kreisumfang K. Die Spritzlöcher sind dabei in zueinander unterschiedlichen Richtungen geneigt, so dass an der Abströmseite, wie durch die Pfeile angedeutet, Kraftstoff in verschiedenste Richtungen austritt.In the third embodiment of FIG. 5 are a total of six injection holes 11 to 16 are provided, wherein the fuel holes are also cylindrical. The centers of the injection holes lie on a common circumference K. The injection holes are inclined in mutually different directions, so that at the downstream side, as indicated by the arrows, fuel in various directions emerges.

Bei dem in Figur 6 gezeigten Ausführungsbeispiel sind lediglich vier Spritzlöcher 11 bis 14 angeordnet. Die Spritzlöcher liegen wieder auf einem Kreisumfang K und die Öffnungsrichtungen der Spritzlöcher sind so gewählt, dass die Spritzlochachsen der paarweisen Spritzlöcher um einen Winkel γ um ca. 140° einander entgegengesetzt gerichtet sind. Somit sind bei diesem Ausführungsbeispiel alle vorhandenen Spritzlöcher paarweise angeordnet, was zu einer besonders guten Kraftstoffaufbereitung führt.At the in FIG. 6 shown embodiment, only four injection holes 11 to 14 are arranged. The injection holes are again on a circumference K and the opening directions of the injection holes are chosen so that the injection hole axes of the pairwise injection holes are directed by an angle γ by about 140 ° opposite to each other. Thus, in this embodiment, all existing spray holes are arranged in pairs, resulting in a particularly good fuel processing.

Das in Figur 7 gezeigte fünfte Ausführungsbeispiel entspricht im Wesentlichen dem dritten Ausführungsbeispiel von Figur 5, wobei im Unterschied dazu die Spritzrichtungen der Spritzlöcher jeweils nur in zwei Richtungen gerichtet sind. Diese Richtungen sind einander um 180° entgegengesetzt, wobei von den sechs angeordneten Spritzlöchern vier in zwei Spritzlochpaaren angeordnet sind und die Spritzlöcher 11, 12 und 13, 14 in jeweils entgegengesetzte Richtungen gerichtet sind.This in FIG. 7 shown fifth embodiment corresponds essentially to the third embodiment of FIG. 5 In contrast, the injection directions of the injection holes are directed in each case only in two directions. These directions are opposite each other by 180 °, of the six arranged spray holes four are arranged in two spray-hole pairs and the injection holes 11, 12 and 13, 14 are directed in opposite directions.

Das in Figur 8 gezeigte sechste Ausführungsbeispiel weist ebenfalls insgesamt sechs Spritzlöcher 11 bis 16 auf, wobei die Spritzlöcher 11 und 12 sowie 13 und 14 jeweils mit einem Abstand 3 zueinander angeordnet sind. In diesem Ausführungsbeispiel ist der Abstand 3 gleich dem zweifachen maximalen Öffnungsrandabstand der Spritzlöcher 11, 12, 13, 14. Da die zylindrischen Spritzlöcher in diesem Ausführungsbeispiel wieder zur axialen Richtung geneigt sind, ist der maximale Öffnungsrandabstand die Hauptachse der Ovale der Spritzlöcher. Die Einspritzrichtung aller Spritzlöcher 11 bis 16 ist dabei nach innen gerichtet, so dass eine hohe Kraftstoffkonzentration in einem mittleren Bereich eines Einspritzraums erhalten wird.This in FIG. 8 Also shown sixth embodiment also has a total of six injection holes 11 to 16, wherein the injection holes 11 and 12 and 13 and 14 are each arranged at a distance 3 to each other. In this embodiment, the distance 3 is equal to twice the maximum opening edge distance of the injection holes 11, 12, 13, 14. Since the cylindrical injection holes are inclined in this embodiment again to the axial direction, the maximum opening edge distance is the major axis of the ovals of the injection holes. The injection direction of all injection holes 11 to 16 is directed inwards, so that a high fuel concentration is obtained in a central region of an injection space.

Das in Figur 9 gezeigte siebte Ausführungsbeispiel entspricht im Wesentlichen dem in Figur 8 gezeigten Ausführungsbeispiel, wobei die Einspritzrichtungen der Spritzlöcher 11 bis 16 unterschiedlich sind. Die Einspritzrichtung der Spritzlöcher 11 und 12 ist nach außen gerichtet.This in FIG. 9 shown seventh embodiment corresponds substantially to the in FIG. 8 shown embodiment, wherein the injection directions of the injection holes 11 to 16 are different. The injection direction of the injection holes 11 and 12 is directed outward.

Figur 10 zeigt ein achtes Ausführungsbeispiel der Erfindung, welches im Wesentlichen dem in Figur 6 gezeigten entspricht. Im Unterschied dazu ist ein Abstand 3 zwischen dem ersten und zweiten Spritzloch 11, 12 und dem dritten und vierten Spritzloch 13, 14 gleich einem zweifachen Öffnungsrandabstand der Spritzlöcher 11, 12 bzw. 13, 14. Ferner sind die beiden Spritzlochpaare einander entgegengesetzt angeordnet und auch die Einspritzrichtungen der jeweiligen Einspritzlöcher gehen im Wesentlichen nach Innen. FIG. 10 shows an eighth embodiment of the invention, which substantially the in FIG. 6 shown corresponds. In contrast, a distance 3 between the first and second injection hole 11, 12 and the third and fourth injection hole 13, 14 equal to a double opening edge distance of the injection holes 11, 12 and 13, 14. Further, the two spray-hole pairs each other arranged opposite and also the injection directions of the respective injection holes go substantially inward.

Zu allen beschriebenen Ausführungsformen sei angemerkt, dass wenigstens zwei Spritzlöcher ein Spritzlochpaar bilden, welches in einem maximalen Abstand 3 eines doppelten Öffnungsrandabstands voneinander entfernt angeordnet ist. Hierdurch wird eine positive gegenseitige Beeinflussung des Strömungsverhaltens an der Einströmseite 2a erreicht, wodurch sich eine verbesserte Spray-Aufbereitung ergibt. Die Form (Kreisform, Ellipse, etc.), die Richtung des Spritzlochachse, der Neigungswinkel der Spritzlochachse, die Innenform (zylindrisch, konisch, sich verjüngend, etc.) der Spritzlöcher können dabei verschieden gewählt werden, wobei für die Spritzlöcher des Spritzlochpaares die Bedingung gilt, dass der Abstand 3 zwischen den beiden Spritzlöchern kleiner als der zweifache, maximale Öffnungsrandabstand an der Einströmseite ist und die Spritzlochachsen der beiden Spritzlöcher in zueinander unterschiedlichen Richtungen angeordnet sind, um zu vermeiden, dass sich die erzeugten Kraftstoff-Sprays überschneiden.For all described embodiments, it should be noted that at least two spray holes form a spray hole pair, which is arranged at a maximum distance 3 of a double opening edge distance from each other. As a result, a positive mutual influence of the flow behavior is achieved on the inflow side 2a, resulting in an improved spray conditioning. The shape (circular shape, ellipse, etc.), the direction of the injection hole axis, the inclination angle of the injection hole axis, the inner shape (cylindrical, conical, tapered, etc.) of the injection holes can be chosen differently, with the spray holes of the spray hole pair the condition is that the distance 3 between the two spray holes is smaller than twice the maximum opening edge distance at the inflow side and the injection hole axes of the two injection holes are arranged in mutually different directions, to avoid that the generated fuel sprays overlap.

Claims (11)

  1. Injection device for injecting fluid, in particular fuel, comprising:
    - a valve seat (4) which, downstream of a sealing surface, has an opening (4a) with a diameter, which opening is adjoined by a funnel-shaped inflow chamber (5) which widens proceeding from said diameter and which serves for supplying the fluid to spray holes (11, 12, 13, 14, 15, 16),
    - wherein the spray holes (11, 12, 13, 14, 15, 16) are arranged so as to be situated radially outside the opening (4a) in the projection, such that a radially outwardly directed flow of the fluid (arrows B, C, D, E) is generated in the inflow chamber (5), characterized
    - in that at least one first spray hole (11) and one second spray hole (12) form a spray hole pair,
    - wherein the first and second spray holes (11, 12) are arranged such that a spacing (3) between the two spray holes (11, 12) is less than or equal to two times a maximum opening edge spacing (D1, D2) at an inflow side (2a) of the two spray holes (11, 12),
    - and wherein the spray hole pair has a spacing to other spray holes greater than the spacing (3) between the first and second spray holes (11, 12),
    - and wherein the spray hole axes (11a, 12a) of the first and second spray holes (11, 12) are arranged in mutually different directions, such that
    - the main flow of the inflowing fluid is directed to each of the two spray holes (11, 12) of a spray hole pair from a side opposite the region between the two spray holes (11, 12) with the spacing (3) (arrow C),
    - wherein a main flow (C) of the fluid is fed to each spray hole at an inflow angle (γ, δ), such that a sum of the inflow angle (γ, δ) and an angle of inclination (α, β) of the spray hole axes (11a, 12a) is less than or equal to 90°.
  2. Injection device according to Claim 1, characterized in that the spacing (3) between the first spray hole (11) and the second spray hole (12) is in a range from 0.5 to 1.5 times the maximum opening edge spacing of the first and/or second spray hole, and preferably in that the spacing (3) is equal to the maximum opening edge spacing of the first and/or second spray hole.
  3. Injection device according to one of the preceding claims, characterized in that the spray hole axes (11a, 12a) of the first and second spray holes (11, 12) are arranged at different angles of inclination ( , β).
  4. Injection device according to one of the preceding claims, characterized in that each of the spray holes (11, 12) has a spray hole axis, which spray hole axes have identical angles of inclination ( , β) but are oriented in different directions.
  5. Injection device according to one of the preceding claims, characterized in that at least four spray holes (11, 12, 13, 14) are provided, wherein in each case two spray holes form a spray hole pair.
  6. Injection device according to one of the preceding claims, characterized in that at least one of the spray holes has a widening shape, in particular a conically widening shape.
  7. Injection device according to one of the preceding claims, characterized in that the spray holes have, at the inflow side (2a), a circular shape, wherein the maximum opening edge spacing at the inflow side (2a) is a diameter of the spray hole, or in that the spray holes have, at the inflow side, an oval shape, in particular an elliptical shape, wherein the maximum opening edge spacing at the inflow side (2a) is defined as the longest axis of the oval shape.
  8. Injection device according to one of the preceding claims, characterized in that the first and second spray hole (11, 12) are arranged on a circle circumference (K), and the spray hole axes (11a, 12a) are arranged at a hole spacing angle (ε) of 20° to 60°, preferably approximately 25°.
  9. Injection device according to one of Claims 5 to 8, comprising a third spray hole (13) and a fourth spray hole (14), wherein the third and fourth spray holes (13, 14) are arranged such that a spacing (3) between the third and fourth spray holes is less than or equal to two times a maximum opening edge spacing (D1, D2) at the inflow side (2a) of the third and fourth spray holes, and wherein spray hole axes of the third and fourth spray holes (13, 14) are arranged in mutually different directions, wherein the third and fourth spray holes are arranged opposite the first and second spray holes (11, 12).
  10. Injection device according to Claim 9, furthermore comprising a fifth spray hole (15) and a sixth spray hole (16) which are arranged opposite one another and whose spray hole axes (15a, 16a) are arranged in different directions.
  11. Injection device according to one of the preceding claims, characterized in that the spray holes (11, 12, 13, 14, 15, 16) are arranged in a spray hole disc (2).
EP11724597.7A 2010-07-22 2011-05-27 Injection device having improved spray preparation Active EP2596230B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010031653A DE102010031653A1 (en) 2010-07-22 2010-07-22 Injection device with improved spray treatment
PCT/EP2011/058770 WO2012010356A1 (en) 2010-07-22 2011-05-27 Injection device having improved spray preparation

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EP2596230A1 EP2596230A1 (en) 2013-05-29
EP2596230B1 true EP2596230B1 (en) 2016-12-07

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US (1) US20130181068A1 (en)
EP (1) EP2596230B1 (en)
DE (1) DE102010031653A1 (en)
WO (1) WO2012010356A1 (en)

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DE102011118299A1 (en) 2011-11-10 2013-05-16 Daimler Ag injection
CN105492758A (en) * 2013-09-06 2016-04-13 3M创新有限公司 Injection molded nozzle preform with undercut micro features
CA3004539C (en) * 2015-11-10 2023-08-22 Nissan Motor Co., Ltd. Control method and control device of internal combustion engine
JP6654875B2 (en) * 2015-11-26 2020-02-26 日立オートモティブシステムズ株式会社 Fuel injection valve
US9964088B2 (en) * 2016-01-18 2018-05-08 Ford Global Technologies, Llc Multi-hole fuel injector with sequential fuel injection
DE102016222606A1 (en) * 2016-11-17 2018-05-17 Robert Bosch Gmbh Injection valve for internal combustion engines

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Publication number Priority date Publication date Assignee Title
JP3837283B2 (en) * 2000-10-24 2006-10-25 株式会社ケーヒン Fuel injection valve
JP3865603B2 (en) * 2001-07-13 2007-01-10 株式会社日立製作所 Fuel injection valve
US20060157595A1 (en) * 2005-01-14 2006-07-20 Peterson William A Jr Fuel injector for high fuel flow rate applications
JP4619989B2 (en) * 2005-07-04 2011-01-26 株式会社デンソー Fuel injection valve
JP4906466B2 (en) * 2006-10-16 2012-03-28 日立オートモティブシステムズ株式会社 Fuel injection valve and fuel injection device for internal combustion engine equipped with the same
JP4529992B2 (en) * 2007-04-05 2010-08-25 株式会社デンソー Injection hole plate and fuel injection valve having the same
JP4416023B2 (en) * 2007-09-10 2010-02-17 株式会社デンソー Fuel injection valve

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DE102010031653A1 (en) 2012-01-26
WO2012010356A1 (en) 2012-01-26
US20130181068A1 (en) 2013-07-18
EP2596230A1 (en) 2013-05-29

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