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EP2525077A1 - Nozzle - Google Patents

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Publication number
EP2525077A1
EP2525077A1 EP20120003561 EP12003561A EP2525077A1 EP 2525077 A1 EP2525077 A1 EP 2525077A1 EP 20120003561 EP20120003561 EP 20120003561 EP 12003561 A EP12003561 A EP 12003561A EP 2525077 A1 EP2525077 A1 EP 2525077A1
Authority
EP
European Patent Office
Prior art keywords
hole
injection
seat
nozzle
blind hole
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP20120003561
Other languages
German (de)
French (fr)
Other versions
EP2525077B1 (en
Inventor
Edgar Bignion
Waldemar Hampel
Walter Meindl
Werner Aichberger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Liebherr Machines Bulle SA
Original Assignee
Liebherr Machines Bulle SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Liebherr Machines Bulle SA filed Critical Liebherr Machines Bulle SA
Publication of EP2525077A1 publication Critical patent/EP2525077A1/en
Application granted granted Critical
Publication of EP2525077B1 publication Critical patent/EP2525077B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F02M61/184—Discharge orifices having non circular sections
    • 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
    • F02M61/1873—Valve seats or member ends having circumferential grooves or ridges, e.g. toroidal
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/494—Fluidic or fluid actuated device making

Definitions

  • the present invention relates to a nozzle with a nozzle body in which a blind hole or seat hole is introduced at the rear, wherein at least one injection hole originates from the blind hole or the seat hole.
  • the present invention relates to a Kraftstoffinjektordüse for injecting fuels in internal combustion engines.
  • nozzles with a dome-shaped elevation as a nozzle body are known from the prior art, in which the cylindrical or conical blind hole or seat hole is introduced at the back. From this then usually run a plurality of injection holes radially outward to the peripheral region of the survey.
  • the injection holes themselves are usually designed as a cylindrical bore.
  • the object of the present invention is to provide, starting from this prior art, a nozzle which has improved endurance, in particular in the area of the spray-hole inlets.
  • a nozzle according to the first aspect of the present invention has a nozzle body, in which a blind hole or seat hole is introduced at the rear, wherein at least one injection hole originates from the blind hole or the seat hole. It is provided that the injection hole in the region of the injection hole inlet has a non-circular cross-section. The non-round cross section allows a targeted alignment of the forces acting on the spray hole and the nozzle body forces. In the injection hole entry is this the blind hole or the seat hole facing the end of the injection hole through which a fluid flowing through the nozzle from the blind hole or seat hole enters the injection hole.
  • the injection hole has a cross section with a longer and a shorter axis of symmetry in the region of the injection hole entry, e.g. an oval cross-section.
  • it is an elliptical cross section.
  • the injection hole in the region of the injection hole outlet on a circular cross-section is obtained.
  • the injection hole outlet is the end of the injection hole remote from the blind hole or seat hole, through which a fluid flowing through the nozzle exits from the injection hole.
  • the first aspect is used in the present invention in nozzles having a plurality of injection holes, which emanate from the blind hole or seat hole, wherein several or all of the injection holes in the region of the injection hole inlet have a non-circular cross-section.
  • the non-circular cross-sections of all blind holes have the same orientation with respect to the longitudinal axis of the blind hole or the seat hole or seat hole.
  • the short or long axes of symmetry of all injection holes with respect to the longitudinal axis of the blind hole or the seat hole or seat hole are all aligned in the same way.
  • the longer axis of the non-round cross-section in particular the longer axis of the ellipse, is aligned parallel or perpendicular to the longitudinal axis of the blind hole or the seat hole or seat hole.
  • the longer axis of the injection hole inlet can be aligned according to the acting stress in the nozzle body, wherein the cross section of the injection hole does not fall below the required minimum cross-section.
  • the nozzle according to a second aspect of the present invention comprises a nozzle body in which a blind hole or seat hole is introduced at the rear, wherein from the blind hole or seat hole run out several injection holes.
  • the blind hole or seat hole has a groove from which the injection holes go out.
  • the arrangement of the spray hole inlets in the region of a groove on the inside of the blind hole or the seat hole can also be the notch stress, which arises in conventional Bohrungsverschneidung be reduced.
  • the groove is arranged rotationally symmetrical to the longitudinal axis of the blind hole or the seat hole.
  • the injection holes are arranged in relation to the blind hole axis at the same height.
  • the width of the groove in the direction of the longitudinal axis of the blind hole or the seat hole is wider than the diameter of the injection holes.
  • the injection holes are distributed uniformly on the circumference of the groove, d. H. that equal distances are provided between the individual spray holes.
  • a nozzle according to a third aspect of the present invention comprises a nozzle body in which a blind hole or seat hole is introduced at the rear, wherein at least one injection hole originates from the blind hole or seat hole.
  • the injection hole is enlarged at the injection hole exit by a reduction. This makes it possible to increase the wall thickness along the injection hole axis, without increasing the spray hole length. This also leads to an increased fatigue strength, especially in the injection hole inlet.
  • the reduction is carried out rotationally symmetrical to the injection hole axis.
  • the countersinking is essentially U-shaped, so that it less influences the geometry of the jet cone leaving the injection hole.
  • the three aspects of the present invention taken alone, allow an increase in the fatigue strength of a nozzle, in particular a fuel injector nozzle.
  • the individual aspects can also be combined with each other.
  • first aspect of the present invention may be combined with the second and / or the third aspect.
  • second aspect can also be combined with the first or third aspect.
  • third aspect can be combined with the first and / or the second aspect.
  • the nozzle body is rotationally symmetrical.
  • the blind hole or seat hole can be performed rotationally symmetrical.
  • a plurality of injection holes are provided, which are arranged uniformly in the circumferential direction about the longitudinal axis of the nozzle body or the blind hole or the seat hole, d. H. with circumferentially equal distances.
  • the nozzle body may comprise a survey, in which the back of the blind hole or seat hole is introduced, wherein a plurality of injection holes leading from the blind hole or seat hole, starting radially outward to the peripheral region of the survey.
  • the survey can be dome-shaped.
  • the nozzle is in particular a fuel injector nozzle for injecting fuel in an internal combustion engine.
  • very high pressures are used in particular in direct injection engines, so that the increased fatigue strength of the nozzle by the present invention is of particular advantage.
  • the present invention further includes an internal combustion engine having such a nozzle for injecting fuel.
  • the nozzle can serve for the direct injection of fuel into the cylinder.
  • the present invention further includes a method of manufacturing a nozzle according to the first aspect of the present invention.
  • the non-round cross-section of the spray hole in the region of the spray hole entry is generated with an erosion wire which, during the production of the spray hole, leaves a path corresponding to the non-circular cross section of the spray hole in the space.
  • the web can be chosen not only in one plane, but also in depth.
  • the nozzle according to the invention advantageously consists of metal.
  • All embodiments of the present invention show a nozzle with a nozzle body 5, in which a blind hole or seat hole 1 is introduced at the back. From the blind hole or seat hole 1 while several spray holes 2 extend to the outside. The injection holes 2 are facing the blind hole or seat hole with their spray hole inlets 3, while the spray hole exits 4 point to the outside of the nozzle body 5.
  • the nozzle body 5 has in the region of the blind hole or the seat hole 1 on a survey, in which the blind hole or seat hole is introduced.
  • the elevation 5 has in the region of the blind hole or the seat hole 1 essentially a dome shape. Both the survey 5 and the blind hole or seat hole 1 are rotationally symmetrical in the embodiment.
  • the injection holes 2 extend from the side walls of the blind hole or the seat hole 1 radially outward to the peripheral region of the nozzle body 5.
  • the longitudinal axes of the injection holes 2 have in the height direction at an acute angle Longitudinal axis of the blind hole or the seat hole 1 and the nozzle body 5 on.
  • the injection holes 2 are arranged evenly around the blind hole or seat hole 1 in the circumferential direction.
  • the injection holes each have a non-circular injection hole entrance 3. Due to the non-circular design of the injection hole inlet 3 and the corresponding orientation of the injection hole inlets, the stresses acting in the region of the nozzle body 5 can be adjusted in a targeted manner.
  • all spray hole inlets have the same non-circular shape and the same orientation with respect to the longitudinal axis of the blind hole or the seat hole 1.
  • the spray hole outlets 4 of the spray holes continue to be circular in order to obtain a conventional fuel jet cone.
  • the spray hole entries are each formed elliptical.
  • the longer symmetry axis of the elliptical shape of the spray hole entry is aligned in accordance with the acting stresses (circumferential or axial stress), wherein the cross-sectional area of the ellipse does not fall below the required minimum cross-sectional area.
  • the ellipse is arranged horizontally at dominating hoop stress in the blind hole or seat hole.
  • the ellipse is arranged horizontally, when the longer axis of symmetry of the ellipse extends in a plane which is perpendicular to the longitudinal axis of the blind hole or the seat hole 1 and the nozzle body 5. This produces a lower notch effect in the direction of loading than when using a circular cross section.
  • the ellipse is arranged vertically at the dominant axial stress in the blind hole or seat hole.
  • the longer axis of symmetry of the ellipse is aligned in the direction of the longitudinal axis of the nozzle. This creates a lower notch effect in the direction of loading than in the circular cross section.
  • FIG. 3 an embodiment of the second aspect of the present invention is shown.
  • a rotationally symmetrical to the blind hole axis 7 groove 6 is provided in the region of the spray hole entries 3.
  • the groove 6 is provided in the side walls of the blind hole or the seat hole 1 and has in the height direction in approximately an extension, which corresponds to the injection holes 2.
  • the spray hole entries 3 are thus completely in the groove 6.
  • FIG. 4 an embodiment of the third aspect of the present invention is shown, according to which a drop 8 is provided at the injection hole outlet 4 respectively.
  • the counterbore 8 is designed rotationally symmetrical to the injection-hole axis 9.
  • the reduction has a U-shaped profile.
  • the present invention further includes a method of manufacturing a nozzle according to the first aspect of the present invention.
  • an erosion wire is used, which moves through a suitable control a defined path in space and thereby provides the non-circular cross section of the injection holes in the inlet region 3 and the round cross section in the exit region 4.
  • an EDM machine is used, in which the web can be chosen not only in one plane, but also in depth.
  • the present invention increases the reliability of the nozzles in the area of bore intersection of blind hole or seat hole to injection hole without having a significant influence on the geometry of the jet cone.
  • the nozzle is used as a fuel injection nozzle.

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

Abstract

The nozzle has a stud hole or seat hole (1) arranged on a rear side of a nozzle body (5), and a spray hole (2) that leads outward from the stud hole or seat hole. The spray hole in a region of the spray hole inlet (3) exhibits a non-circular cross section and an oval cross section i.e. elliptical cross section. The spray hole in a region of a spray hole outlet (4) exhibits a circular cross section, and the stud hole or seat hole exhibits a groove (6), where the spray hole leads out from the groove. The spray hole is widened by a counter-bore at the spray hole outlet. An independent claim is also included for a method for manufacturing a nozzle.

Description

Die vorliegende Erfindung betrifft eine Düse mit einem Düsenkörper, in welchem rückseitig ein Sackloch oder Sitzloch eingebracht ist, wobei von dem Sackloch oder dem Sitzloch mindestens ein Spritzloch ausgeht. Insbesondere betrifft die vorliegende Erfindung dabei eine Kraftstoffinjektordüse zum Einspritzen von Kraftstoffen in Verbrennungsmotoren.The present invention relates to a nozzle with a nozzle body in which a blind hole or seat hole is introduced at the rear, wherein at least one injection hole originates from the blind hole or the seat hole. In particular, the present invention relates to a Kraftstoffinjektordüse for injecting fuels in internal combustion engines.

Aus dem Stand der Technik sind dabei Düsen mit einer kuppelförmigen Erhebung als Düsenkörper bekannt, in welchen rückseitig das zylindrische oder konische Sackloch oder Sitzloch eingebracht ist. Von diesem aus verlaufen dann üblicherweise mehrere Spritzlöcher radial nach außen zum Umfangsbereich der Erhebung. Die Spritzlöcher selbst sind dabei üblicherweise als zylindrische Bohrung ausgeführt.In this case, nozzles with a dome-shaped elevation as a nozzle body are known from the prior art, in which the cylindrical or conical blind hole or seat hole is introduced at the back. From this then usually run a plurality of injection holes radially outward to the peripheral region of the survey. The injection holes themselves are usually designed as a cylindrical bore.

Aufgabe der vorliegenden Erfindung ist es, ausgehend von diesem Stand der Technik eine Düse zur Verfügung zu stellen, welche eine verbesserte Dauersicherheit insbesondere im Bereich der Spritzlocheintritte aufweist.The object of the present invention is to provide, starting from this prior art, a nozzle which has improved endurance, in particular in the area of the spray-hole inlets.

Diese Aufgabe wird jeweils unabhängig voneinander durch eine Düse gemäß Anspruch 1, eine Düse gemäß Anspruch 5 sowie durch eine Düse gemäß Anspruch 7 gelöst.This object is achieved independently of each other by a nozzle according to claim 1, a nozzle according to claim 5 and by a nozzle according to claim 7.

Eine Düse gemäß dem ersten Aspekt der vorliegenden Erfindung weist dabei einen Düsenkörper auf, in welchen rückseitig ein Sackloch oder Sitzloch eingebracht ist, wobei von dem Sackloch oder dem Sitzloch aus mindestens ein Spritzloch ausgeht. Dabei ist vorgesehen, dass das Spritzloch im Bereich des Spritzlocheintritts einen nicht-runden Querschnitt aufweist. Der nicht-runde Querschnitt erlaubt dabei eine gezielte Ausrichtung der auf das Spritzloch und den Düsenkörper wirkenden Kräfte. Bei dem Spritzlocheintritt handelt es sich dabei um das dem Sackloch oder dem Sitzloch zugewandte Ende des Spritzlochs, durch welches ein durch die Düse hindurchfließendes Fluid von dem Sackloch oder Sitzloch in das Spritzloch eintritt.A nozzle according to the first aspect of the present invention has a nozzle body, in which a blind hole or seat hole is introduced at the rear, wherein at least one injection hole originates from the blind hole or the seat hole. It is provided that the injection hole in the region of the injection hole inlet has a non-circular cross-section. The non-round cross section allows a targeted alignment of the forces acting on the spray hole and the nozzle body forces. In the injection hole entry is this the blind hole or the seat hole facing the end of the injection hole through which a fluid flowing through the nozzle from the blind hole or seat hole enters the injection hole.

Vorteilhafterweise weist das Spritzloch dabei im Bereich des Spritzlocheintritts einen Querschnitt mit einer längeren und einer kürzeren Symmetrieachse auf, z.B. einen ovalen Querschnitt. Vorteilhafterweise handelt es sich um einen elliptischen Querschnitt.Advantageously, the injection hole has a cross section with a longer and a shorter axis of symmetry in the region of the injection hole entry, e.g. an oval cross-section. Advantageously, it is an elliptical cross section.

Weiterhin vorteilhafterweise weist das Spritzloch im Bereich des Spritzlochaustritts einen kreisförmigen Querschnitt auf. Hierdurch wird der übliche Strahlkonus des die Düse verlassenden Strahls erhalten. Bei dem Spritzlochaustritt handelt es sich dabei um das dem Sackloch oder Sitzloch abgewandte Ende des Spritzlochs, durch welches ein durch die Düse hindurchfließendes Fluid aus dem Spritzloch austritt.Further advantageously, the injection hole in the region of the injection hole outlet on a circular cross-section. As a result, the usual beam cone of the jet leaving the nozzle is obtained. The injection hole outlet is the end of the injection hole remote from the blind hole or seat hole, through which a fluid flowing through the nozzle exits from the injection hole.

Vorteilhafterweise wird der erste Aspekt in der vorliegenden Erfindung dabei bei Düsen eingesetzt, welche mehrere Spritzlöcher aufweisen, welche vom Sackloch oder Sitzloch ausgehen, wobei mehrere oder alle der Spritzlöcher im Bereich des Spritzlocheintritts einen nicht-runden Querschnitt aufweisen.Advantageously, the first aspect is used in the present invention in nozzles having a plurality of injection holes, which emanate from the blind hole or seat hole, wherein several or all of the injection holes in the region of the injection hole inlet have a non-circular cross-section.

Vorteilhafterweise weisen die nicht-runden Querschnitte aller Sacklöcher dabei die gleiche Ausrichtung bezüglich der Längsachse des Sacklochs oder des Sitzlochs oder Sitzlochs auf. Insbesondere sind dabei die kurzen bzw. langen Symmetrieachsen aller Spritzlöcher in Bezug auf die Längsachse des Sacklochs oder des Sitzlochs oder Sitzlochs alle in gleicher Weise ausgerichtet.Advantageously, the non-circular cross-sections of all blind holes have the same orientation with respect to the longitudinal axis of the blind hole or the seat hole or seat hole. In particular, the short or long axes of symmetry of all injection holes with respect to the longitudinal axis of the blind hole or the seat hole or seat hole are all aligned in the same way.

Weiterhin vorteilhafterweise ist dabei die längere Achse des nicht-runden Querschnitts, insbesondere die längere Achse der Ellipse, parallel oder senkrecht zur Längsachse des Sacklochs oder des Sitzlochs oder Sitzlochs ausgerichtet.Further advantageously, the longer axis of the non-round cross-section, in particular the longer axis of the ellipse, is aligned parallel or perpendicular to the longitudinal axis of the blind hole or the seat hole or seat hole.

Durch die nicht-runde Form des Spritzlocheintritts läßt sich die längere Achse des Spritzlocheintritts entsprechend der wirkenden Spannung im Düsenkörper ausrichten, wobei der Querschnitt des Spritzlochs den geforderten Mindestquerschnitt nicht unterschreitet.Due to the non-round shape of the injection hole entry, the longer axis of the injection hole inlet can be aligned according to the acting stress in the nozzle body, wherein the cross section of the injection hole does not fall below the required minimum cross-section.

Bei dominierender Umfangsspannung im Sackloch oder Sitzloch wird dabei die längere Achse horizontal angeordnet, d. h. in eine Ebene senkrecht zur Längsachse des Sacklochs oder des Sitzlochs oder Sitzlochs. Hierdurch entsteht in Belastungsrichtung eine geringere Kerbwirkung als beim Kreisquerschnitt. Bei dominierender Axialspannung im Sackloch oder Sitzloch wird die längere Achse des Spritzlocheintritts dagegen vertikal angeordnet, d. h. jeweils in einer Ebene, welche parallel zur Längsachse des Sacklochs oder des Sitzlochs oder Sitzlochs verläuft. Auch durch diese Anordnung kann in Belastungsrichtung eine geringere Kerbwirkung erzielt werden als bei der Verwendung eines Kreisquerschnitts für den Spritzlocheintritt.At dominating hoop stress in the blind hole or seat hole while the longer axis is arranged horizontally, d. H. in a plane perpendicular to the longitudinal axis of the blind hole or the seat hole or seat hole. This creates a lower notch effect in the direction of loading than in the circular cross section. At dominant axial stress in the blind hole or seat hole, however, the longer axis of the injection hole entry is arranged vertically, d. H. each in a plane which is parallel to the longitudinal axis of the blind hole or the seat hole or seat hole. Also by this arrangement, a lower notch effect can be achieved in the loading direction than when using a circular cross-section for the injection hole entry.

Die Düse gemäß einem zweiten Aspekt der vorliegenden Erfindung umfaßt einen Düsenkörper, in welchem rückseitig ein Sackloch oder Sitzloch eingebracht ist, wobei von dem Sackloch oder Sitzloch mehrere Spritzlöcher ausgehen. Erfindungsgemäß ist dabei vorgesehen, dass das Sackloch oder Sitzloch eine Nut aufweist, von welcher aus die Spritzlöcher ausgehen. Durch die Anordnung der Spritzlocheintritte im Bereich einer Nut auf der Innenseite des Sacklochs oder des Sitzlochs können ebenfalls die Kerbspannung, welche bei konventioneller Bohrungsverschneidung entsteht, verringert werden.The nozzle according to a second aspect of the present invention comprises a nozzle body in which a blind hole or seat hole is introduced at the rear, wherein from the blind hole or seat hole run out several injection holes. According to the invention it is provided that the blind hole or seat hole has a groove from which the injection holes go out. The arrangement of the spray hole inlets in the region of a groove on the inside of the blind hole or the seat hole can also be the notch stress, which arises in conventional Bohrungsverschneidung be reduced.

Vorteilhafterweise ist dabei vorgesehen, daß die Nut zu der Längsachse des Sacklochs oder des Sitzlochs rotationssymmetrisch angeordnet ist.Advantageously, it is provided that the groove is arranged rotationally symmetrical to the longitudinal axis of the blind hole or the seat hole.

Weiterhin kann vorgesehen sein, daß die Spritzlöcher in Bezug auf die Sacklochachse auf gleicher Höhe angeordnet sind. Vorteilhafterweise ist dabei die Breite der Nut in Richtung der Längsachse des Sacklochs oder des Sitzlochs breiter als der Durchmesser der Spritzlöcher.Furthermore, it can be provided that the injection holes are arranged in relation to the blind hole axis at the same height. Advantageously, the width of the groove in the direction of the longitudinal axis of the blind hole or the seat hole is wider than the diameter of the injection holes.

Weiterhin kann vorgesehen sein, daß die Spritzlöcher gleichmäßig auf dem Umfang der Nut verteilt sind, d. h. daß zwischen den einzelnen Spritzlöchern gleiche Abstände vorgesehen sind.Furthermore, it can be provided that the injection holes are distributed uniformly on the circumference of the groove, d. H. that equal distances are provided between the individual spray holes.

Eine Düse gemäß einem dritten Aspekt der vorliegenden Erfindung weist einen Düsenkörper auf, in welchem rückseitig ein Sackloch oder Sitzloch eingebracht ist, wobei von dem Sackloch oder Sitzloch mindestens ein Spritzloch ausgeht. Erfindungsgemäß ist dabei vorgesehen, daß das Spritzloch am Spritzlochaustritt durch eine Senkung erweitert ist. Diese ermöglicht es, die Wandstärke entlang der Spritzlochachse zu erhöhen, ohne die Spritzlochlänge zu vergrößern. Auch dies führt zu einer erhöhten Dauerfestigkeit insbesondere im Spritzlocheintritt.A nozzle according to a third aspect of the present invention comprises a nozzle body in which a blind hole or seat hole is introduced at the rear, wherein at least one injection hole originates from the blind hole or seat hole. According to the invention it is provided that the injection hole is enlarged at the injection hole exit by a reduction. This makes it possible to increase the wall thickness along the injection hole axis, without increasing the spray hole length. This also leads to an increased fatigue strength, especially in the injection hole inlet.

Vorteilhafterweise ist die Senkung dabei rotationssymmetrisch zur Spritzlochachse ausgeführt. Besonders vorteilhaft ist die Senkung dabei im Wesentlichen U-förmig, so daß sie die Geometrie des das Spritzloch verlassenden Strahlkonuses weniger beeinflußt.Advantageously, the reduction is carried out rotationally symmetrical to the injection hole axis. Particularly advantageously, the countersinking is essentially U-shaped, so that it less influences the geometry of the jet cone leaving the injection hole.

Die drei Aspekte der vorliegenden Erfindung erlauben bereits jeweils für sich genommen eine Steigerung der Dauerfestigkeit einer Düse, insbesondere einer Kraftstoffinjektordüse. Die einzelnen Aspekte können dabei auch miteinander kombiniert werden.The three aspects of the present invention, taken alone, allow an increase in the fatigue strength of a nozzle, in particular a fuel injector nozzle. The individual aspects can also be combined with each other.

Insbesondere kann dabei der erste Aspekt der vorliegenden Erfindung mit dem zweiten und/oder dem dritten Aspekt kombiniert werden. Weiterhin vorteilhaft kann auch der zweite Aspekt mit dem ersten oder dritten Aspekt kombiniert werden. Ebenso kann der dritte Aspekt mit dem ersten und/oder dem zweiten Aspekt kombiniert werden.In particular, the first aspect of the present invention may be combined with the second and / or the third aspect. Further advantageously, the second aspect can also be combined with the first or third aspect. Likewise, the third aspect can be combined with the first and / or the second aspect.

Sämtliche Aspekte der vorliegenden Erfindung kommen bevorzugt bei Düsen zum Einsatz, wie sie im Folgenden näher beschrieben werden:

  • Die Düse kann mehrere Spritzlöcher aufweisen, welche vom Sackloch oder Sitzloch aus ausgehen. Insbesondere sind dabei mehr als drei Spritzlöcher, weiterhin vorteilhafterweise mehr als sechs Spritzlöcher vorgesehen. Vorteilhafterweise verlaufen dabei die Längsachsen der Spritzlöcher in einem spitzen Winkel zur Längsachse des Sacklochs oder des Sitzlochs radial nach außen.
All aspects of the present invention are preferably used with nozzles, as described in more detail below:
  • The nozzle may have a plurality of injection holes, which emanate from the blind hole or seat hole. In particular, more than three injection holes, more advantageously more than six injection holes are provided. Advantageously, the longitudinal axes of the injection holes extend at an acute angle to the longitudinal axis of the blind hole or the seat hole radially outward.

Weiterhin vorteilhaftweise kann vorgesehen sein, daß der Düsenkörper rotationssymmetrisch ausgeführt ist. Ebenso kann das Sackloch oder Sitzloch rotationssymmentrisch ausgeführt sein. Vorteilhafterweise sind dabei mehrere Spritzlöcher vorgesehen, welche gleichmäßig in Umfangsrichtung um die Längsachse des Düsenkörpers bzw. des Sacklochs oder des Sitzlochs angeordnet sind, d. h. mit in Umfangsrichtung gleichen Abständen.Furthermore advantageously, it can be provided that the nozzle body is rotationally symmetrical. Likewise, the blind hole or seat hole can be performed rotationally symmetrical. Advantageously, a plurality of injection holes are provided, which are arranged uniformly in the circumferential direction about the longitudinal axis of the nozzle body or the blind hole or the seat hole, d. H. with circumferentially equal distances.

Weiterhin kann der Düsenkörper eine Erhebung aufweisen, in welcher rückseitig das Sackloch oder Sitzloch eingebracht ist, wobei mehrere Spritzlöcher vom Sackloch oder Sitzloch ausgehend radial nach außen zum Umfangsbereich der Erhebung führen. Insbesondere kann die Erhebung dabei kuppelförmig sein.Furthermore, the nozzle body may comprise a survey, in which the back of the blind hole or seat hole is introduced, wherein a plurality of injection holes leading from the blind hole or seat hole, starting radially outward to the peripheral region of the survey. In particular, the survey can be dome-shaped.

Sind dabei erfindungsgemäß mehrere Spritzlöcher vorgesehen, so sind diese vorteilhafterweise alle identisch ausgeführt.If according to the invention a plurality of injection holes are provided, these are advantageously all identical.

Wie bereits oben beschrieben, handelt es sich bei der Düse insbesondere um eine Kraftstoffinjektordüse zum Einspritzen von Kraftstoff in einem Verbrennungsmotor. Dabei werden insbesondere bei Direkteinspritzungsmotoren sehr hohe Drucke eingesetzt, so daß die durch die vorliegende Erfindung erhöhte Dauerfestigkeit der Düse von besonderem Vorteil ist.As described above, the nozzle is in particular a fuel injector nozzle for injecting fuel in an internal combustion engine. In this case, very high pressures are used in particular in direct injection engines, so that the increased fatigue strength of the nozzle by the present invention is of particular advantage.

Neben der Düse umfaßt die vorliegende Erfindung dabei weiterhin einen Verbrennungsmotor mit einer solchen Düse zur Injektion von Kraftstoff. Insbesondere kann die Düse dabei zur direkten Injektion von Kraftstoff in den Zylinder dienen.Besides the nozzle, the present invention further includes an internal combustion engine having such a nozzle for injecting fuel. In particular, the nozzle can serve for the direct injection of fuel into the cylinder.

Neben der Düse selbst umfaßt die vorliegende Erfindung weiterhin ein Verfahren zur Herstellung einer Düse gemäß dem ersten Aspekt der vorliegenden Erfindung. Erfindungsgemäß wird dabei der nicht-runde Querschnitt des Spritzlochs im Bereich des Spritzlocheintritts mit einem Erodierdraht erzeugt, welcher während der Herstellung des Spritzlochs eine dem nicht-runden Querschnitt des Spritzlochs entsprechende Bahn im Raum abfährt.Besides the nozzle itself, the present invention further includes a method of manufacturing a nozzle according to the first aspect of the present invention. According to the invention, the non-round cross-section of the spray hole in the region of the spray hole entry is generated with an erosion wire which, during the production of the spray hole, leaves a path corresponding to the non-circular cross section of the spray hole in the space.

Vorteilhafterweise wird dabei bei der Herstellung der Düse durch eine entsprechende Steuerung der Erodierdrahtmaschine eine definierte Bahn im Raum durch den Erodierdraht abgefahren, welcher das Spritzloch gemäß dem ersten Aspekt der vorliegenden Erfindung herstellt. Vorteilhafterweise kann die Bahn dabei nicht nur in einer Ebene beliebig gewählt werden, sondern auch in der Tiefe.Advantageously, in the production of the nozzle by a corresponding control of the erosion wire machine, a defined path in the space is traversed by the erosion wire, which produces the injection port according to the first aspect of the present invention. Advantageously, the web can be chosen not only in one plane, but also in depth.

Die Verwendung eines Erodierdrahts ermöglicht es so, den spezifischen Querschnitt des Spritzlochs im Bereich des Spritzlocheintritts und ggf. im Bereich des Spritzlochaustritts aus dem Material des Düsenkörpers herauszuschneiden.The use of an erosion wire thus makes it possible to cut out the specific cross-section of the injection hole in the region of the injection hole inlet and possibly in the region of the injection hole exit from the material of the nozzle body.

Die erfindungsgemäße Düse besteht dabei vorteilhafterweise aus Metall.The nozzle according to the invention advantageously consists of metal.

Die vorliegende Erfindung wird nun anhand von Ausführungsbeispielen sowie Zeichnungen näher beschrieben.The present invention will now be described in more detail with reference to embodiments and drawings.

Dabei zeigen:

Figur 1:
ein erstes Ausführungsbeispiel des ersten Aspekts der vorliegenden Erfindung,
Figur 2:
ein zweites Ausführungsbeispiel des ersten Aspekts der vorliegenden Erfindung,
Figur 3:
ein Ausführungsbeispiel des zweiten Aspekts der vorliegenden Erfindung, und
Figur 4:
ein Ausführungsbeispiel des dritten Aspekts der vorliegenden Erfindung.
Showing:
FIG. 1:
A first embodiment of the first aspect of the present invention
FIG. 2:
A second embodiment of the first aspect of the present invention
FIG. 3:
an embodiment of the second aspect of the present invention, and
FIG. 4:
an embodiment of the third aspect of the present invention.

Die drei Aspekte der vorliegenden Erfindung werden im Folgenden der besseren Übersicht halber jeweils einzeln anhand von Ausführungsbeispielen beschrieben. Besonders bevorzugt werden jedoch zwei der Aspekte oder alle drei Aspekte miteinander kombiniert.The three aspects of the present invention are described below for better clarity in each case individually with reference to exemplary embodiments. More preferably, however, two of the aspects or all three aspects are combined.

Alle Ausführungsbeispiele der vorliegenden Erfindung zeigen eine Düse mit einem Düsenkörper 5, in welchem rückseitig ein Sackloch oder Sitzloch 1 eingebracht ist. Von dem Sackloch oder Sitzloch 1 verlaufen dabei mehrere Spritzlöcher 2 nach außen. Die Spritzlöcher 2 sind dabei mit ihren Spritzlocheintritten 3 dem Sackloch oder Sitzloch zugewandt, während die Spritzlochaustritte 4 zur Außenseite des Düsenkörpers 5 weisen.All embodiments of the present invention show a nozzle with a nozzle body 5, in which a blind hole or seat hole 1 is introduced at the back. From the blind hole or seat hole 1 while several spray holes 2 extend to the outside. The injection holes 2 are facing the blind hole or seat hole with their spray hole inlets 3, while the spray hole exits 4 point to the outside of the nozzle body 5.

Der Düsenkörper 5 weist dabei im Bereich des Sacklochs oder des Sitzlochs 1 eine Erhebung auf, in welche das Sackloch oder Sitzloch eingebracht ist. Die Erhebung 5 hat dabei im Bereich des Sacklochs oder des Sitzlochs 1 im Wesentlichen eine Kuppelform. Sowohl die Erhebung 5 als auch das Sackloch oder Sitzloch 1 sind im Ausführungsbeispiel rotationssymmetrisch.The nozzle body 5 has in the region of the blind hole or the seat hole 1 on a survey, in which the blind hole or seat hole is introduced. The elevation 5 has in the region of the blind hole or the seat hole 1 essentially a dome shape. Both the survey 5 and the blind hole or seat hole 1 are rotationally symmetrical in the embodiment.

Die Spritzlöcher 2 verlaufen dabei von den Seitenwänden des Sacklochs oder des Sitzlochs 1 radial nach außen zum Umfangsbereich des Düsenkörpers 5. Die Längsachsen der Spritzlöcher 2 weisen in Höhenrichtung einen spitzen Winkel zur Längsachse des Sacklochs oder des Sitzlochs 1 bzw. des Düsenkörpers 5 auf. Die Spritzlöcher 2 sind in Umfangsrichtung gleichmäßig um das Sackloch oder Sitzloch 1 angeordnet.The injection holes 2 extend from the side walls of the blind hole or the seat hole 1 radially outward to the peripheral region of the nozzle body 5. The longitudinal axes of the injection holes 2 have in the height direction at an acute angle Longitudinal axis of the blind hole or the seat hole 1 and the nozzle body 5 on. The injection holes 2 are arranged evenly around the blind hole or seat hole 1 in the circumferential direction.

Bei den in Figuren 1 und 2 dargestellten Ausführungsbeispielen des ersten Aspekts der vorliegenden Erfindung weisen die Spritzlöcher jeweils einen nichtkreisförmigen Spritzlocheintritt 3 auf. Durch die nicht-runde Ausführung des Spritzlocheintritts 3 und die entsprechende Ausrichtung der Spritzlocheintritte können die im Bereich des Düsenkörpers 5 wirkenden Spannungen gezielt eingestellt werden. Insbesondere weisen dabei alle Spritzlocheintritte die gleiche nicht-runde Form und die gleiche Ausrichtung in Bezug auf die Längsachse des Sacklochs oder des Sitzlochs 1 auf. Die Spritzlochaustritte 4 der Spritzlöcher 2 sind dagegen weiterhin kreisförmig, um einen üblichen Kraftstoffstrahlkonus zu erhalten.At the in Figures 1 and 2 illustrated embodiments of the first aspect of the present invention, the injection holes each have a non-circular injection hole entrance 3. Due to the non-circular design of the injection hole inlet 3 and the corresponding orientation of the injection hole inlets, the stresses acting in the region of the nozzle body 5 can be adjusted in a targeted manner. In particular, all spray hole inlets have the same non-circular shape and the same orientation with respect to the longitudinal axis of the blind hole or the seat hole 1. The spray hole outlets 4 of the spray holes 2, however, continue to be circular in order to obtain a conventional fuel jet cone.

Bei beiden in Figur 1 und 2 gezeigten Ausführungsbeispielen sind die Spritzlocheintritte dabei jeweils ellipsenförmig geformt. Dabei ist die längere Symmetrieachse der Ellipsenform des Spritzlocheintritts entsprechend den wirkenden Spannungen (Umfangs- oder Axialspannung) ausgerichtet, wobei die Querschnittsfläche der Ellipse die geforderte Mindestquerschnittsfläche nicht unterschreitet.In both in FIGS. 1 and 2 The exemplary embodiments shown, the spray hole entries are each formed elliptical. In this case, the longer symmetry axis of the elliptical shape of the spray hole entry is aligned in accordance with the acting stresses (circumferential or axial stress), wherein the cross-sectional area of the ellipse does not fall below the required minimum cross-sectional area.

Wie in Figur 1 gezeigt, wird bei dominierender Umfangsspannung im Sackloch oder Sitzloch 1 die Ellipse horizontal angeordnet. Die Ellipse ist dabei horizontal angeordnet, wenn die längere Symmetrieachse der Ellipse in einer Ebene verläuft, die senkrecht auf der Längsachse des Sacklochs oder des Sitzlochs 1 bzw. des Düsenkörpers 5 liegt. Hierdurch entsteht in Belastungsrichtung eine geringere Kerbwirkung als bei Verwendung eines Kreisquerschnitts.As in FIG. 1 shown, the ellipse is arranged horizontally at dominating hoop stress in the blind hole or seat hole. The ellipse is arranged horizontally, when the longer axis of symmetry of the ellipse extends in a plane which is perpendicular to the longitudinal axis of the blind hole or the seat hole 1 and the nozzle body 5. This produces a lower notch effect in the direction of loading than when using a circular cross section.

Wie in Figur 2 dargestellt, wird bei dominierender Axialspannung im Sackloch oder Sitzloch dagegen die Ellipse vertikal angeordnet. Bei dieser Anordnung ist die längere Symmetrieachse der Ellipse in Richtung der Längsachse der Düse ausgerichtet. Hierdurch entsteht in Belastungsrichtung eine geringere Kerbwirkung als beim Kreisquerschnitt.As in FIG. 2 in contrast, the ellipse is arranged vertically at the dominant axial stress in the blind hole or seat hole. In this arrangement, the longer axis of symmetry of the ellipse is aligned in the direction of the longitudinal axis of the nozzle. This creates a lower notch effect in the direction of loading than in the circular cross section.

In Figur 3 ist ein Ausführungsbeispiel des zweiten Aspekts der vorliegenden Erfindung dargestellt. Dabei ist eine zur Sacklochachse 7 rotationssymmetrische Nut 6 im Bereich der Spritzlocheintritte 3 vorgesehen. Die Nut 6 ist dabei in den Seitenwänden des Sacklochs oder des Sitzlochs 1 vorgesehen und weist in Höhenrichtung in etwa eine Erstreckung auf, welche der der Spritzlöcher 2 entspricht. Die Spritzlocheintritte 3 befinden sich damit komplett im Bereich der Nut 6.In FIG. 3 an embodiment of the second aspect of the present invention is shown. In this case, a rotationally symmetrical to the blind hole axis 7 groove 6 is provided in the region of the spray hole entries 3. The groove 6 is provided in the side walls of the blind hole or the seat hole 1 and has in the height direction in approximately an extension, which corresponds to the injection holes 2. The spray hole entries 3 are thus completely in the groove 6.

Die hohen Kerbspannungen, welche bei konventioneller Bohrungsverschneidung entstehen, werden durch die erfindungsgemäße rotationssymmetrische Nut 6 im Sackloch oder Sitzloch, von welcher aus die Spritzlöcher 2 abgehen, verringert.The high notch stresses that occur in conventional Bohrungsverschneidung be reduced by the inventive rotationally symmetrical groove 6 in the blind hole or seat hole from which the spray holes 2 depart.

In Figur 4 ist ein Ausführungsbeispiel des dritten Aspekts der vorliegenden Erfindung gezeigt, gemäß welchem am Spritzlochaustritt 4 jeweils eine Senkung 8 vorgesehen ist. Im Ausführungsbeispiel ist die Senkung 8 dabei zur Spritzlochachse 9 rotationssymmetrisch ausgeführt. Insbesondere weist die Senkung dabei ein U-förmiges Profil auf. Gemäß dem dritten Aspekt der vorliegenden Erfindung ist es möglich, die Wandstärke des Düsenkörpers 5 entlang der Spritzlochachse zu vergrößern, ohne die Spritzlochlänge zu erhöhen. Dies führt zur Dauerfestigkeit im Spritzlocheintritt, und das bei nahezu gleichbleibender Geometrie des Strahlkonusses.In FIG. 4 an embodiment of the third aspect of the present invention is shown, according to which a drop 8 is provided at the injection hole outlet 4 respectively. In the exemplary embodiment, the counterbore 8 is designed rotationally symmetrical to the injection-hole axis 9. In particular, the reduction has a U-shaped profile. According to the third aspect of the present invention, it is possible to increase the wall thickness of the nozzle body 5 along the injection hole axis without increasing the injection hole length. This leads to fatigue strength in the injection hole entrance, and that with almost constant geometry of the jet cone.

Neben den Düsen selbst umfaßt die vorliegende Erfindung weiterhin ein Verfahren zur Herstellung einer Düse gemäß dem ersten Aspekt der vorliegenden Erfindung. Bei der Fertigung der Spritzlöcher wird dabei ein Erodierdraht eingesetzt, welcher durch eine passende Steuerung eine definierte Bahn im Raum abfährt und hierdurch den nicht-runden Querschnitt der Spritzlöcher im Eintrittsbereich 3 sowie den runden Querschnitt im Austrittsbereich 4 zur Verfügung stellt. Hierfür wird eine Erodiermaschine eingesetzt, bei welcher die Bahn nicht nur in einer Ebene beliebig gewählt werden kann, sondern auch in der Tiefe.Besides the nozzles themselves, the present invention further includes a method of manufacturing a nozzle according to the first aspect of the present invention. In the manufacture of the injection holes, an erosion wire is used, which moves through a suitable control a defined path in space and thereby provides the non-circular cross section of the injection holes in the inlet region 3 and the round cross section in the exit region 4. For this purpose, an EDM machine is used, in which the web can be chosen not only in one plane, but also in depth.

Die vorliegende Erfindung erhöht durch alle drei Aspekte die Dauersicherheit der Düsen im Bereich der Bohrungsverschneidung von Sackloch oder Sitzloch zu Spritzloch, ohne einen wesentlichen Einfluß auf die Geometrie des Strahlkonusses zu haben. Insbesondere wird die Düse dabei als Kraftstoffeinspritzdüse eingesetzt.The present invention, through all three aspects, increases the reliability of the nozzles in the area of bore intersection of blind hole or seat hole to injection hole without having a significant influence on the geometry of the jet cone. In particular, the nozzle is used as a fuel injection nozzle.

Claims (15)

Düse mit einem Düsenkörper (5), in welchen rückseitig ein Sackloch oder Sitzloch (1) eingebracht ist, wobei von dem Sackloch oder Sitzloch (1) mindestens ein Spritzloch (2) ausgeht,
dadurch gekennzeichnet,
dass das Spritzloch (2) im Bereich des Spritzlocheintritts (3) einen nicht-runden Querschnitt aufweist.Nozzle with a nozzle body (5), in which a blind hole or seat hole (1) is introduced at the rear, wherein at least one injection hole (2) emanates from the blind hole or seat hole (1),
characterized,
that the injection hole (2) has a non-round cross section in the region of the injection hole entrance (3). Düse nach Anspruch 1, wobei das Spritzloch (2) im Bereich des Spritzlocheintritts (3) einen ovalen Querschnitt aufweist, insbesondere einen elliptischen Querschnitt.Nozzle according to claim 1, wherein the spray hole (2) in the region of the spray hole inlet (3) has an oval cross section, in particular an elliptical cross section. Düse nach Anspruch 1 oder 2, wobei das Spritzloch (2) im Bereich des Spritzlochaustritts (4) einen kreisförmigen Querschnitt aufweist.Nozzle according to claim 1 or 2, wherein the spray hole (2) in the region of the spray hole outlet (4) has a circular cross-section. Düse nach einem der vorangegangenen Ansprüche, wobei mehrere Spritzlöcher (2) vorgesehen sind, welche vom Sackloch oder Sitzloch (1) ausgehen, wobei die nicht-runden Querschnitte aller Sacklöcher die gleiche Ausrichtung bezüglich der Längsachse (7) des Sacklochs oder des Sitzlochs aufweisen, wobei vorteilhafterweise die längere Achse der Öffnungen, welche die Spritzlöcher im Bereich ihrer Spritzlocheintritte (3) bilden, parallel oder senkrecht zur Längsachse (7) des Sacklochs oder des Sitzlochs ausgerichtet ist.Nozzle according to one of the preceding claims, wherein a plurality of spray holes (2) are provided, which extend from the blind hole or seat hole (1), wherein the non-round cross sections of all blind holes have the same orientation with respect to the longitudinal axis (7) of the blind hole or the seat hole, wherein advantageously the longer axis of the openings, which form the injection holes in the region of their spray hole inlets (3), is aligned parallel or perpendicular to the longitudinal axis (7) of the blind hole or the seat hole. Düse mit einem Düsenkörper (5), in welchen rückseitig ein Sackloch oder Sitzloch (1) eingebracht ist, wobei von dem Sackloch oder Sitzloch (1) mehrere Spritzlöcher (2) ausgehen,
dadurch gekennzeichnet,
dass das Sackloch oder Sitzloch (1) eine Nut (6) aufweist, von welcher aus die Spritzlöcher (2) ausgehen.Nozzle with a nozzle body (5), in which a blind hole or seat hole (1) is introduced at the rear, wherein from the blind hole or seat hole (1) run out several spray holes (2),
characterized,
that the blind hole or seat hole (1) has a groove (6), from which the injection holes (2) go out. Düse nach Anspruch 5, wobei die Nut (6) zu der Längsachse (7) des Sacklochs oder des Sitzlochs (1) rotationssymmetrisch angeordnet ist und/oder wobei die Spritzlöcher (2) in Bezug auf die Längsachse (7) des Sacklochs oder des Sitzlochs auf gleicher Höhe angeordnet sind und/oder wobei die Spritzlöcher (2) gleichmäßig auf den Umfang der Nut (6) verteilt sind.Nozzle according to claim 5, wherein the groove (6) is rotationally symmetrical about the longitudinal axis (7) of the blind hole or the seat hole (1) and / or the injection holes (2) are relative to the longitudinal axis (7) of the blind hole or the seat hole are arranged at the same height and / or wherein the injection holes (2) are evenly distributed over the circumference of the groove (6). Düse mit einem Düsenkörper (5), in welchen rückseitig ein Sackloch oder Sitzloch (1) eingebracht ist, wobei von dem Sackloch oder Sitzloch (1) mindestens ein Spritzloch (2) ausgeht,
dadurch gekennzeichnet,
dass das Spritzloch (2) am Spritzlochaustritt (4) durch eine Senkung (8) erweitert ist.Nozzle with a nozzle body (5), in which a blind hole or seat hole (1) is introduced at the rear, wherein at least one injection hole (2) emanates from the blind hole or seat hole (1),
characterized,
that the spray hole (2) at the spray hole outlet (4) is widened by a countersink (8). Düse nach Anspruch 7, wobei die Senkung (8) rotationssymmetrisch zur Spritzlochachse (9) ausgeführt ist.Nozzle according to claim 7, wherein the counterbore (8) is rotationally symmetrical to the injection-hole axis (9). Düse nach einem der Ansprüche 1 bis 4 mit den Merkmalen eines oder mehrerer der Ansprüche 5 bis 8.Nozzle according to one of Claims 1 to 4, having the features of one or more of Claims 5 to 8. Düse nach einem der Ansprüche 5 oder 6 mit den Merkmalen eines oder mehrerer der Ansprüche 1 bis 4 und/oder 7 und 8.Nozzle according to one of claims 5 or 6 having the features of one or more of claims 1 to 4 and / or 7 and 8. Düse nach einem der vorangegangenen Ansprüche, wobei mehrere Spritzlöcher (2) vorgesehen sind, welche vom Sackloch oder Sitzloch (1) ausgehen, wobei die Längsachsen (9) der Spritzlöcher vorteilhafterweise in einem spitzen Winkel zur Längsachse (7) des Sacklochs oder des Sitzlochs (1) radial nach außen verlaufen.Nozzle according to one of the preceding claims, wherein a plurality of injection holes (2) are provided, which extend from the blind hole or seat hole (1), wherein the longitudinal axes (9) of the injection holes advantageously at an acute angle to the longitudinal axis (7) of the blind hole or the seat hole ( 1) extend radially outwards. Düse nach einem der vorangegangenen Ansprüche, wobei der Düsenkörper (5) und/oder das Sackloch oder Sitzloch (1) rotationssymmetrisch ausgeführt sind.Nozzle according to one of the preceding claims, wherein the nozzle body (5) and / or the blind hole or seat hole (1) are rotationally symmetrical. Düse nach einem der vorangegangenen Ansprüche, wobei der Düsenkörper (5) eine vorteilhafterweise kuppelförmige Erhebung aufweist, in welche rückseitig das Sackloch oder Sitzloch (1) eingebracht ist, wobei mehrere Spritzlöcher (2) vom Sackloch oder Sitzloch ausgehend radial nach außen zum Umfangsbereich der Erhebung führen.Nozzle according to one of the preceding claims, wherein the nozzle body (5) has an advantageously dome-shaped elevation, in which the blind hole or seat hole (1) is introduced, wherein a plurality of injection holes (2) starting from the blind hole or seat hole radially outward to the peripheral region of the survey to lead. Verbrennungsmotor mit einer Düse nach einem der vorangegangenen Ansprüche zur Injektion von Kraftstoff.Internal combustion engine with a nozzle according to one of the preceding claims for the injection of fuel. Verfahren zur Herstellung einer Düse nach einem der Ansprüche 1 bis 4, wobei der nicht-runde Querschnitt des Spritzlochs (2) im Bereich des Spritzlocheintritts (3) mit einem Erodierdraht erzeugt wird, welcher während der Herstellung des Spritzlochs eine dem nicht-runden Querschnitt des Spritzlochs entsprechende Bahn im Raum abfährt.A method for producing a nozzle according to one of claims 1 to 4, wherein the non-round cross-section of the injection hole (2) in the region of the injection hole entrance (3) is produced with an erosion wire, which during the production of the injection hole a non-circular cross section of Spray hole corresponding web in the room leaves.
EP12003561.3A 2011-05-16 2012-05-07 Nozzle Active EP2525077B1 (en)

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EP2525077B1 (en) 2017-04-19
US20120292409A1 (en) 2012-11-22
CH704964A1 (en) 2012-11-30

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