EP3475555A1 - Nozzle body for a fuel injector - Google Patents

Nozzle body for a fuel injector

Info

Publication number
EP3475555A1
EP3475555A1 EP17731874.8A EP17731874A EP3475555A1 EP 3475555 A1 EP3475555 A1 EP 3475555A1 EP 17731874 A EP17731874 A EP 17731874A EP 3475555 A1 EP3475555 A1 EP 3475555A1
Authority
EP
European Patent Office
Prior art keywords
nozzle body
nozzle
cooling
matrix
kidney
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
EP17731874.8A
Other languages
German (de)
French (fr)
Other versions
EP3475555B1 (en
Inventor
Walter Walkner
Arno Seiringer
Heinrich Werger
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP3475555A1 publication Critical patent/EP3475555A1/en
Application granted granted Critical
Publication of EP3475555B1 publication Critical patent/EP3475555B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M53/00—Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means
    • F02M53/04—Injectors with heating, cooling, or thermally-insulating means
    • F02M53/043—Injectors with heating, cooling, or thermally-insulating means with cooling means other than air cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K21/00—Making hollow articles not covered by a single preceding sub-group
    • B21K21/08—Shaping hollow articles with different cross-section in longitudinal direction, e.g. nozzles, spark-plugs
    • 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
    • F02M61/1866—Valve seats or member ends having multiple cones
    • 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
    • F02M2700/00—Supplying, feeding or preparing air, fuel, fuel air mixtures or auxiliary fluids for a combustion engine; Use of exhaust gas; Compressors for piston engines
    • F02M2700/07—Nozzles and injectors with controllable fuel supply
    • F02M2700/077—Injectors having cooling or heating means

Definitions

  • the invention relates to a nozzle body for a fuel injector for
  • a nozzle body for a fuel injector for injecting fuel into the combustion chamber of an internal combustion engine according to the preamble of claim 1 is known from EP 1 781 931 Bl.
  • the known fuel injector comprises a holding body, a valve body with throttle plate and a nozzle body.
  • the holding body and the nozzle body are through a nozzle retaining nut
  • a pressure chamber is formed, which is supplied via an inlet bore with pressurized fuel.
  • An at least one injection opening releasing or closing longitudinally movable nozzle needle is arranged to be longitudinally movable in the pressure chamber.
  • the nozzle body according to the invention for a fuel injector has cooling channels which are optimized in their cooling effect. Nevertheless, the nozzle body is designed in one piece, so that can be dispensed with elaborate manufacturing techniques and seals. Furthermore, the structural weakening of the nozzle body by the cooling channels is only marginal. For this purpose, a pressure chamber is formed in the nozzle body, which has a
  • Inlet bore can be supplied with fuel under high pressure.
  • a nozzle needle releasing or closing at least one injection opening is arranged longitudinally movably in the pressure space. The at least one
  • Injection opening is formed in a nozzle tip of the nozzle body.
  • In the nozzle body can be flowed through with cooling medium cooling channels.
  • Cooling channels comprise a cooling matrix formed in the nozzle tip.
  • the nozzle body is also made in one piece.
  • the cooling matrix has the largest possible effective for the cooling surface, so that the heat input from the nozzle tip into the cooling medium is very large and the cooling of the nozzle body thereby particularly effective.
  • the cooling channels, in particular the cooling matrix, are
  • the cooling matrix is designed fence-shaped, meandering or helical.
  • the entire convection surface of the cooling matrix ie the separation surface between the nozzle body and the cooling matrix, can be made very large.
  • a large heat flow from the nozzle tip into the Cooling medium is the result.
  • the cooling of the nozzle body is thereby particularly effective.
  • the flow through the cooling matrix is additionally designed in a particularly defined manner; there is no danger of the cooling medium standing in local areas and not flowing.
  • the cooling matrix is designed ring-cylindrical.
  • the nozzle body can be made very compact in its axial dimensions.
  • the cooling matrix is penetrated by material pores of the nozzle tip. As a result, the entire convection surface can be increased again. The heat exchange between the nozzle tip and the cooling medium is thereby further optimized.
  • the cooling channels comprise an elongated
  • Inlet channel and an elongated flow channel for supplying and discharging cooling medium in the cooling matrix and from the cooling matrix.
  • the nozzle tip is the hottest portion of the nozzle body and the cooling matrix disposed therein.
  • the supply and removal of the cooling medium in the nozzle body or from the nozzle body takes place at the nozzle tip
  • Drain channel is therefore a fluidically favorable design to connect the cooling matrix hydraulically to the supply of cooling medium.
  • the cooling channels have an inlet kidney and an outlet kidney.
  • the inlet kidney and the Auslassniere are formed on one of the nozzle tip opposite end face of the nozzle body.
  • the inlet kidney goes into the inlet channel and the outlet kidney goes into the outlet channel.
  • the nozzle body can be braced on the end face with a further component, for example a holding body or a throttle plate, the connection of the cooling channels not being tight
  • the inlet kidney and the outlet kidney are the hydraulic connection of the cooling channels to the adjacent component. Due to the comparatively large areas of the two kidneys, have Dimensional deviations to the connection geometries no disadvantage
  • the nozzle body has a
  • Thermal conductivity has as the remaining area of the nozzle body.
  • the amount of heat transported through the convection area is therefore particularly large.
  • defined main heat flows can be advantageously arranged, for example, from the injection openings to the cooling matrix.
  • a particularly thermally conductive material for example, copper for the
  • Convection area can be used. Due to the 3D printing process nevertheless creates a solid cohesive connection to the other
  • Nozzle body in a fuel injector has a
  • Control valve for controlling the pressure of a control room.
  • the control chamber is limited by the nozzle needle.
  • the opening and closing movements of the nozzle needle are thus controlled by the pressure in the control chamber, which in turn is controlled by the control valve.
  • the manufacturing method of the nozzle body according to the invention is an SD printing method, since only so that the complex geometry of the cooling matrix can be realized in a one-piece nozzle body. Sealing plugs, other components, welds, sealants and the like
  • Body made of the nozzle body, preferably by forging or casting.
  • this basic body optional partial geometries of the Be designed cooling channels, for example as a longitudinal section of holes or as a half-model. Subsequently, the remaining, the cooling channels
  • convection areas can then also be applied with a material of high thermal conductivity by means of 3D printing.
  • Fig. 4 shows a detail of a negative form of cooling channels in another
  • FIG. 1 shows a longitudinal section of a fuel injector 100 for injecting fuel into the combustion chamber of an internal combustion engine, as is known from the prior art.
  • the known fuel injector 100 comprises a holding body 1, a
  • Valve body 3 a throttle plate 5 and a nozzle body 16. All these components are held together by a nozzle retaining nut 7.
  • the nozzle body 16 in this case contains a nozzle needle 6, which in an im
  • Nozzle body 16 formed pressure chamber 8 is arranged longitudinally displaceable. During an opening movement of the nozzle needle 6 fuel over several in Nozzle body 16 injection openings 60 injected into the combustion chamber of the internal combustion engine.
  • a collar is visible, on which a compression spring 61 is supported.
  • the other end of the compression spring 61 is supported on a control sleeve 62, which in turn rests against the underside of the throttle plate 5.
  • the control sleeve 62 defines with the upper, the injection openings 60 opposite end face of the nozzle needle 6 and the underside of the throttle plate 5 a control chamber 63.
  • the pressure prevailing in the control chamber 63 pressure is decisive for the control of the longitudinal movement of the nozzle needle 6.
  • An inlet bore 64 is formed in the fuel injector 100. About the
  • the fuel pressure on the one hand in the pressure chamber 8 is effective, where he exerts a force in the opening direction of the nozzle needle 6 via a pressure shoulder of the nozzle needle 6.
  • this fuel pressure acts via an inlet throttle 65 formed in the control sleeve 62 in the control chamber 63 and, supported by the force of the compression spring 61, holds the nozzle needle 6 in its
  • the fuel injector 100 further includes a control valve 2 for controlling the
  • Outflow channel 76 flow.
  • the lowering of the hydraulic force in this way on the upper end face of the nozzle needle 6 leads to an opening of the nozzle needle 6.
  • the fuel from the pressure chamber 8 thus passes through the injection openings 60 into the combustion chamber of the internal combustion engine.
  • cooling passages 30 are in valve body 3, throttle plate 5 and nozzle body 16 of the known
  • Fuel injector 100 is formed. Thus, especially the tip of the nozzle needle 6 and the nozzle body 16 can be cooled.
  • the cooling channels 30 are partially in the inlet bore 64. However, this is only due to the sectional view, in the embodiments are the
  • Cooling channels 30 separated from the inlet bore 64.
  • the cooling channels 30 are now formed in a one-piece SD printed nozzle body 16.
  • any shapes of the cooling channels can be realized, on the other hand can be dispensed with a complex construction with multiple components.
  • FIG. 2 shows a nozzle body 16 produced in the 3D printing process in a perspective transparent view.
  • the inlet bore 64 in the pressure chamber 8 is not shown.
  • the nozzle body 16 are as usual the
  • Cooling channels 30 are formed so that they have a very large area to the nozzle body 16 in the region of the nozzle tip 16a of the nozzle body 16, ie near the injection openings 60.
  • the cooling channels 30 comprise an inlet kidney 33 and an outlet kidney 34 for connection to the component adjacent to the nozzle body 16, thus, for example, the throttle plate 5 or the holding body 1, depending on the design of the
  • Fuel injector 100 The external cooling connections of the fuel injector 100 are generally formed on the holding body 1.
  • the cooling channels 30 further comprise an elongate inlet channel 31, an elongate outlet channel 32 and a cooling matrix 35.
  • the cooling matrix 35 is preferably provided with a large total area for effective cooling of the nozzle tip 16a, so that maximum heat transfer from the very hot nozzle tip 16a in FIG that the cooling channels 30th can flow through cooling medium. This extends the
  • Cooling matrix 35 preferably also over the entire circumference of the nozzle tip 16a.
  • Convection region 37 as shown in Figure 2 surrounding the cooling matrix 35.
  • the convection region 37 is made of a different material, for example copper, than the remaining nozzle body 16, but nevertheless connected to it in a material-locking manner due to the 3D printing.
  • the convection region 37 has a particularly high thermal conductivity and serves to conduct the largest possible amount of heat from very hot regions of the nozzle body 16 to the cooling matrix 35.
  • the convection region 37 is arranged in the vicinity of the injection openings 60 in the nozzle tip 16a, since there usually the highest temperatures of the fuel injector 100 prevail.
  • cooling matrix 35 is executed fence-shaped. Further embodiments are shown in the following figures 3 and 4.
  • FIG 3 shows a negative model of the cooling matrix 35 - ie the geometry of the cooling medium - in helical or meander shape. Due to the meandering shape, the cooling matrix 35 flows through in a particularly defined manner, since there are no branches in the flow direction. Standing cooling medium - and thus locally low heat transfer coefficients - are thus excluded.
  • cooling matrix 35 as a ring cylinder with a plurality of
  • the pores 36 are thus material of the nozzle body 16, for example steel.
  • the convection surface of the cooling matrix 35 is particularly large. Accordingly, a large heat input from the nozzle tip 16a into the cooling medium can occur.
  • the cooling matrix 35 may also be annular.
  • Nozzle body 16 to use. Especially with regard to the property of the thermal conductivity, heat flows in the direction of the cooling channels 30 can thus be advantageously influenced.
  • One or more convection regions 37 which have a particularly high thermal conductivity and preferably run from the region of the injection openings 60 to the cooling matrix 35, are applied by means of 3D printing.
  • the cooling channels 30 may already be present in partial contours.
  • the outer region of the nozzle body 16, in particular the region surrounding the cooling matrix 35 and optionally also the convection region 17, is then applied by means of 3D printing.

Landscapes

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

Abstract

The invention relates to a nozzle body (16), in particular in use in a fuel injector (100) for injecting fuel into the combustion chamber of an internal combustion engine. The nozzle body (16) is made in one piece. The nozzle body (16) comprises a pressure chamber (8) which can be supplied, via a supply bore (64), with high-pressure fuel. A nozzle needle (6), which opens or closes at least one injection opening (60), is arranged in the pressure chamber (8) so as to be able to move longitudinally. The at least one injection opening (60) is formed in a nozzle tip (16a) of the nozzle body (16). Cooling channels (30), through which coolant can be made to flow, are formed in the nozzle body (16). The cooling channels (30) include a cooling matrix (35) formed in the nozzle tip (16a).

Description

Beschreibung  description
Titel title
Düsenkörper für einen Kraftstoffinjektor Stand der Technik  Nozzle body for a fuel injector prior art
Die Erfindung betrifft einen Düsenkörper für einen Kraftstoffinjektor zum The invention relates to a nozzle body for a fuel injector for
Einspritzen von Kraftstoff in den Brennraum einer Brennkraftmaschine, wobei der Düsenkörper Kühlkanäle aufweist. Injecting fuel into the combustion chamber of an internal combustion engine, wherein the nozzle body has cooling channels.
Ein Düsenkörper für einen Kraftstoffinjektor zum Einspritzen von Kraftstoff in den Brennraum einer Brennkraftmaschine nach dem Oberbegriff des Anspruchs 1 ist aus der EP 1 781 931 Bl bekannt. Der bekannte Kraftstoffinjektor umfasst einen Haltekörper, einen Ventilkörper mit Drosselplatte und einen Düsenkörper. Der Haltekörper und der Düsenkörper sind durch eine Düsenspannmutter A nozzle body for a fuel injector for injecting fuel into the combustion chamber of an internal combustion engine according to the preamble of claim 1 is known from EP 1 781 931 Bl. The known fuel injector comprises a holding body, a valve body with throttle plate and a nozzle body. The holding body and the nozzle body are through a nozzle retaining nut
miteinander verspannt. In dem Düsenkörper ist ein Druckraum ausgebildet, der über eine Zulaufbohrung mit unter Druck stehendem Kraftstoff versorgbar ist. Eine zumindest eine Einspritzöffnung freigebende oder verschließende längsbewegliche Düsennadel ist in dem Druckraum längsbeweglich angeordnet. braced together. In the nozzle body, a pressure chamber is formed, which is supplied via an inlet bore with pressurized fuel. An at least one injection opening releasing or closing longitudinally movable nozzle needle is arranged to be longitudinally movable in the pressure chamber.
Weiterhin weist der bekannte Kraftstoffinjektor in dem Düsenkörper ausgebildete Kühlkanäle auf. Über die Ausführung und Herstellung dieser Kühlkanäle offenbart die EP 1 781 931 Bl jedoch nichts. Des Weiteren ist die nichtvorveröffentlichte DE 10 2016 206 796 AI aus demFurthermore, the known fuel injector in the nozzle body formed on cooling channels. However, EP 1 781 931 Bl discloses nothing about the design and manufacture of these cooling channels. Furthermore, the unpublished DE 10 2016 206 796 AI from the
Stand der Technik bekannt, welche die Ausbildung von Kühlkanälen zwischen dem Düsenkörper und einem zusätzlichen Bauteil, der Kühlkappe, offenbart. Known in the art, which discloses the formation of cooling channels between the nozzle body and an additional component, the cooling cap.
Die Ausführungen der Kühlkanäle der bekannten Kraftstoffinjektoren erfordern komplexe Ausführungen und einen hohen fertigungstechnischen Aufwand. Offenbarung der Erfindung The designs of the cooling channels of the known Kraftstoffinjektoren require complex designs and high manufacturing complexity. Disclosure of the invention
Der erfindungsgemäße Düsenkörper für einen Kraftstoffinjektor weist demgegen- über Kühlkanäle auf, die in ihrer Kühlwirkung optimiert sind. Dennoch ist der Düsenkörper einstückig gestaltet, so dass auf aufwändige Fertigungstechniken und Abdichtungen verzichtet werden kann. Weiterhin ist die Strukturschwächung des Düsenkörpers durch die Kühlkanäle nur marginal. Dazu ist in dem Düsenkörper ein Druckraum ausgebildet, der über eine In contrast, the nozzle body according to the invention for a fuel injector has cooling channels which are optimized in their cooling effect. Nevertheless, the nozzle body is designed in one piece, so that can be dispensed with elaborate manufacturing techniques and seals. Furthermore, the structural weakening of the nozzle body by the cooling channels is only marginal. For this purpose, a pressure chamber is formed in the nozzle body, which has a
Zulaufbohrung mit unter Hochdruck stehendem Kraftstoff versorgbar ist. Eine zumindest eine Einspritzöffnung freigebende oder verschließende Düsennadel ist in dem Druckraum längsbeweglich angeordnet. Die zumindest eine  Inlet bore can be supplied with fuel under high pressure. A nozzle needle releasing or closing at least one injection opening is arranged longitudinally movably in the pressure space. The at least one
Einspritzöffnung ist in einer Düsenspitze des Düsenkörpers ausgebildet. In dem Düsenkörper sind mit Kühlmedium durchströmbare Kühlkanäle ausgebildet. DieInjection opening is formed in a nozzle tip of the nozzle body. In the nozzle body can be flowed through with cooling medium cooling channels. The
Kühlkanäle umfassen eine in der Düsenspitze ausgebildete Kühlmatrix. Der Düsenkörper ist weiterhin einstückig ausgeführt. Cooling channels comprise a cooling matrix formed in the nozzle tip. The nozzle body is also made in one piece.
Im Betrieb des Kraftstoff injektors ist besonders die Düsenspitze sehr hohen Temperaturen ausgesetzt. Eine effektive Kühlung der Düsenspitze hat eine robuste Funktionalität und eine erhöhte Lebensdauer des Kraftstoffinjektors zur Folge. Die Kühlmatrix weist eine möglichst große, für die Kühlung wirksame Gesamtfläche auf, so dass der Wärmeeintrag von der Düsenspitze in das Kühlmedium sehr groß ist und die Kühlung des Düsenkörpers dadurch besonders effektiv. Die Kühlkanäle, insbesondere die Kühlmatrix sind mittels SD-In the operation of the fuel injector especially the nozzle tip is exposed to very high temperatures. Effective cooling of the nozzle tip results in robust functionality and increased fuel injector life. The cooling matrix has the largest possible effective for the cooling surface, so that the heat input from the nozzle tip into the cooling medium is very large and the cooling of the nozzle body thereby particularly effective. The cooling channels, in particular the cooling matrix, are
Druck-Verfahren hergestellt. Mit anderen Fertigungsverfahren, beispielsweise konventioneller Dreh- und Bohrtechnik, kann die Geometrie der Kühlmatrix in einem einstückigen Düsenkörper nicht hergestellt werden. Auf aufwändige Ersatzmaßnahmen wie Schweißen oder Verschlussstopfen kann daher verzichtet werden. Damit einhergehende Anschlussprobleme wie mangelnde Dichtheit oder verminderte Festigkeit entfallen. Printing process produced. With other manufacturing methods, such as conventional turning and drilling technique, the geometry of the cooling matrix in a one-piece nozzle body can not be produced. Complex replacement measures such as welding or sealing plugs can therefore be dispensed with. Associated connection problems such as lack of tightness or reduced strength eliminated.
In vorteilhaften Ausführungen ist die Kühlmatrix zaunförmig, mäanderförmig oder wendeiförmig gestaltet. Dadurch kann die gesamte Konvektionsfläche der Kühlmatrix, also die Trennfläche zwischen Düsenkörper und Kühlmatrix, sehr groß gestaltet werden. Ein großer Wärmefluss von der Düsenspitze in das Kühlmedium ist die Folge. Die Kühlung des Düsenkörpers ist dadurch besonders effektiv. Bei den wendel- und mäanderförmigen Ausführungen der Kühlmatrix ist die Durchströmung der Kühlmatrix zusätzlich besonders definiert gestaltet, es gibt keine Gefahr, dass das Kühlmedium in lokalen Bereichen steht und nicht fließt. In advantageous embodiments, the cooling matrix is designed fence-shaped, meandering or helical. As a result, the entire convection surface of the cooling matrix, ie the separation surface between the nozzle body and the cooling matrix, can be made very large. A large heat flow from the nozzle tip into the Cooling medium is the result. The cooling of the nozzle body is thereby particularly effective. In the helical and meander-shaped versions of the cooling matrix, the flow through the cooling matrix is additionally designed in a particularly defined manner; there is no danger of the cooling medium standing in local areas and not flowing.
In einer anderen vorteilhaften Ausführung ist die Kühlmatrix ringzylinderförmig gestaltet. Dadurch kann der Düsenkörper in seinen axialen Abmaßen sehr kompakt ausgeführt werden. In another advantageous embodiment, the cooling matrix is designed ring-cylindrical. As a result, the nozzle body can be made very compact in its axial dimensions.
In vorteilhaften Weiterbildungen ist die Kühlmatrix von Materialporen der Düsenspitze durchsetzt. Dadurch kann die gesamte Konvektionsfläche noch einmal vergrößert werden. Der Wärmeaustausch zwischen Düsenspitze und Kühlmedium ist dadurch weiter optimiert. In advantageous developments, the cooling matrix is penetrated by material pores of the nozzle tip. As a result, the entire convection surface can be increased again. The heat exchange between the nozzle tip and the cooling medium is thereby further optimized.
In vorteilhaften Ausführungen umfassen die Kühlkanäle einen länglichen In advantageous embodiments, the cooling channels comprise an elongated
Zulaufkanal und einen länglichen Ablaufkanal zum Zu- und Abführen von Kühlmedium in die Kühlmatrix und aus der Kühlmatrix. Typischerweise ist die Düsenspitze der heißeste Bereich des Düsenkörpers und die Kühlmatrix in diesem angeordnet. Die Zu- und Abfuhr des Kühlmediums in den Düsenkörper bzw. aus dem Düsenkörper erfolgt jedoch an der der Düsenspitze Inlet channel and an elongated flow channel for supplying and discharging cooling medium in the cooling matrix and from the cooling matrix. Typically, the nozzle tip is the hottest portion of the nozzle body and the cooling matrix disposed therein. However, the supply and removal of the cooling medium in the nozzle body or from the nozzle body takes place at the nozzle tip
gegenüberliegenden Stirnseite des Düsenkörpers. Der längliche Zu- bzw. opposite end face of the nozzle body. The oblong Zu- or
Ablaufkanal ist demzufolge eine strömungstechnisch günstige Ausführung um die Kühlmatrix hydraulisch an die Versorgung mit Kühlmedium anzuschließen. Drain channel is therefore a fluidically favorable design to connect the cooling matrix hydraulically to the supply of cooling medium.
In vorteilhaften Weiterbildungen weisen die Kühlkanäle eine Einlassniere und eine Auslassniere auf. Die Einlassniere und die Auslassniere sind an einer der Düsenspitze gegenüberliegenden Stirnseite des Düsenkörpers ausgebildet. Die Einlassniere geht in den Zulaufkanal über, und die Auslassniere geht in den Ablaufkanal über. Dadurch kann der Düsenkörper an der Stirnseite mit einem weiteren Bauteil, beispielsweise einem Haltekörper oder einer Drosselplatte, verspannt werden, wobei die Anbindung der Kühlkanäle keinen engen In advantageous developments, the cooling channels have an inlet kidney and an outlet kidney. The inlet kidney and the Auslassniere are formed on one of the nozzle tip opposite end face of the nozzle body. The inlet kidney goes into the inlet channel and the outlet kidney goes into the outlet channel. As a result, the nozzle body can be braced on the end face with a further component, for example a holding body or a throttle plate, the connection of the cooling channels not being tight
Toleranzen unterliegen muss. Die Einlassniere und die Auslassniere sind die hydraulische Verbindung der Kühlkanäle zu dem benachbarten Bauteil. Durch die vergleichsweise großen Flächen der beiden Nieren, haben Maßabweichungen zu den Anschlussgeometrien keine nachteil Must be subject to tolerances. The inlet kidney and the outlet kidney are the hydraulic connection of the cooling channels to the adjacent component. Due to the comparatively large areas of the two kidneys, have Dimensional deviations to the connection geometries no disadvantage
Auswirkungen auf die Durchströmung der Kühlkanäle. Effects on the flow through the cooling channels.
In vorteilhaften Weiterbildungen weist der Düsenkörper einen In advantageous developments, the nozzle body has a
Konvektionsbereich auf, wobei der Konvektionsbereich eine größere Convection on, with the convection area a larger
Wärmeleitfähigkeit besitzt als der übrige Bereich des Düsenkörpers. Die durch den Konvektionsbereich transportierte Wärmemenge ist damit besonders groß. So können definierte Hauptwärmeströme vorteilhaft angeordnet werden, beispielsweise von den Einspritzöffnungen zu der Kühlmatrix. Als besonders wärmeleitfähiges Material kann beispielsweise Kupfer für den Thermal conductivity has as the remaining area of the nozzle body. The amount of heat transported through the convection area is therefore particularly large. Thus, defined main heat flows can be advantageously arranged, for example, from the injection openings to the cooling matrix. As a particularly thermally conductive material, for example, copper for the
Konvektionsbereich verwendet werden. Aufgrund des 3D-Druck-Verfahrens entsteht dennoch eine feste stoffschlüssige Verbindung zu den weiteren Convection area can be used. Due to the 3D printing process nevertheless creates a solid cohesive connection to the other
Bereichen des Düsenkörpers. Eine besonders vorteilhafte Verwendung findet der erfindungsgemäße Areas of the nozzle body. A particularly advantageous use of the invention
Düsenkörper in einem Kraftstoffinjektor. Der Kraftstoffinjektor weist ein  Nozzle body in a fuel injector. The fuel injector has a
Steuerventil zur Steuerung des Drucks eines Steuerraums auf. Der Steuerraum ist dabei durch die Düsennadel begrenzt. Die Öffnungs- und Schließbewegungen der Düsennadel werden also durch den Druck im Steuerraum gesteuert, welcher wiederum von dem Steuerventil gesteuert wird. Der Kraftstoffinjektor zumControl valve for controlling the pressure of a control room. The control chamber is limited by the nozzle needle. The opening and closing movements of the nozzle needle are thus controlled by the pressure in the control chamber, which in turn is controlled by the control valve. The fuel injector for
Einspritzen von unter Hochdruck stehendem Kraftstoff in den Brennraum einer Brennkraftmaschine ist besonders hohen Temperaturen ausgesetzt, dies gilt insbesondere für die Düsenspitze, an welcher die Einspritzöffnungen in den Brennraum ausgebildet sind. Die Kühlung der Düsenspitze über die Kühlmatrix ist für derartige Kraftstoffinjektoren daher besonders wichtig und besonders effektiv. Injection of high-pressure fuel into the combustion chamber of an internal combustion engine is exposed to particularly high temperatures, this is especially true for the nozzle tip, on which the injection openings are formed in the combustion chamber. The cooling of the nozzle tip via the cooling matrix is therefore particularly important and particularly effective for such fuel injectors.
Das Herstellungsverfahren des erfindungsgemäßen Düsenkörpers ist ein SD- Druck-Verfahren, da lediglich damit die komplexe Geometrie der Kühlmatrix in einem einstückigen Düsenkörper realisiert werden kann. Verschlussstopfen, weitere Bauteile, Schweißnähte, Abdichtmittel und ähnliche The manufacturing method of the nozzle body according to the invention is an SD printing method, since only so that the complex geometry of the cooling matrix can be realized in a one-piece nozzle body. Sealing plugs, other components, welds, sealants and the like
Umgehungsmaßnahmen entfallen dadurch. By-pass measures are eliminated.
In einer vorteilhaften Weiterbildung des Verfahrens wird zunächst ein In an advantageous embodiment of the method is initially a
Grundkörper des Düsenkörpers gefertigt, vorzugsweise durch Schmieden oder Gießen. In diesem Grundkörper können optional auch bereits Teilgeometrien der Kühlkanäle ausgebildet sein, beispielsweise als Längsschnitt von Bohrungen bzw. als Halbmodell. Anschließend wird das restliche, die Kühlkanäle Body made of the nozzle body, preferably by forging or casting. In this basic body optional partial geometries of the Be designed cooling channels, for example as a longitudinal section of holes or as a half-model. Subsequently, the remaining, the cooling channels
umgebende Material per 3D-Druck appliziert. Gegebenenfalls können dann auch noch Konvektionsbereiche mit einem besonders wärmeleitfähigen Material per 3D-Druck appliziert werden. surrounding material applied by 3D printing. If appropriate, convection areas can then also be applied with a material of high thermal conductivity by means of 3D printing.
Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung bevorzugter Ausführungsbeispiele sowie anhand der Zeichnungen. Further advantages, features and details of the invention will become apparent from the following description of preferred embodiments and from the drawings.
Diese zeigen in: These show in:
Fig. 1 einen Längsschnitt durch einen Kraftstoffinjektor gemäß dem Stand der Technik, 1 shows a longitudinal section through a fuel injector according to the prior art,
Fig. 2 einen Düsenkörper in transparenter perspektivischer Ansicht, 2 a nozzle body in a transparent perspective view,
Fig. 3 einen Ausschnitt einer Negativform von Kühlkanälen, 3 shows a detail of a negative form of cooling channels,
Fig. 4 einen Ausschnitt einer Negativform von Kühlkanälen in einer weiteren Fig. 4 shows a detail of a negative form of cooling channels in another
Ausführungsform.  Embodiment.
Gleiche Elemente bzw. Elemente mit gleicher Funktion sind in den Figuren mit den gleichen Bezugsziffern versehen. The same elements or elements with the same function are provided in the figures with the same reference numerals.
In der Fig.l ist ein Kraftstoffinjektor 100 zum Einspritzen von Kraftstoff in den Brennraum einer Brennkraftmaschine im Längsschnitt dargestellt, wie er aus dem Stand der Technik bekannt ist. FIG. 1 shows a longitudinal section of a fuel injector 100 for injecting fuel into the combustion chamber of an internal combustion engine, as is known from the prior art.
Der bekannte Kraftstoffinjektor 100 umfasst einen Haltekörper 1, einen The known fuel injector 100 comprises a holding body 1, a
Ventilkörper 3, eine Drosselplatte 5 und einen Düsenkörper 16. Alle diese Bauteile werden durch eine Düsenspannmutter 7 zusammengehalten. Der Düsenkörper 16 enthält hierbei eine Düsennadel 6, welche in einem im Valve body 3, a throttle plate 5 and a nozzle body 16. All these components are held together by a nozzle retaining nut 7. The nozzle body 16 in this case contains a nozzle needle 6, which in an im
Düsenkörper 16 ausgebildeten Druckraum 8 längsverschiebbar angeordnet ist. Bei einer Öffnungsbewegung der Düsennadel 6 wird Kraftstoff über mehrere im Düsenkörper 16 ausgebildete Einspritzöffnungen 60 in den Brennraum der Brennkraftmaschine eingespritzt. Nozzle body 16 formed pressure chamber 8 is arranged longitudinally displaceable. During an opening movement of the nozzle needle 6 fuel over several in Nozzle body 16 injection openings 60 injected into the combustion chamber of the internal combustion engine.
An der Düsennadel 6 ist ein Bund ersichtlich, an welchem eine Druckfeder 61 abgestützt ist. Das andere Ende der Druckfeder 61 ist an einer Steuerhülse 62 abgestützt, welche selbst wiederum an der Unterseite der Drosselplatte 5 anliegt. Die Steuerhülse 62 definiert mit der oberen, den Einspritzöffnungen 60 gegenüberliegenden Stirnfläche der Düsennadel 6 und mit der Unterseite der Drosselplatte 5 einen Steuerraum 63. Der im Steuerraum 63 herrschende Druck ist für die Steuerung der Längsbewegung der Düsennadel 6 maßgeblich. At the nozzle needle 6, a collar is visible, on which a compression spring 61 is supported. The other end of the compression spring 61 is supported on a control sleeve 62, which in turn rests against the underside of the throttle plate 5. The control sleeve 62 defines with the upper, the injection openings 60 opposite end face of the nozzle needle 6 and the underside of the throttle plate 5 a control chamber 63. The pressure prevailing in the control chamber 63 pressure is decisive for the control of the longitudinal movement of the nozzle needle 6.
Im Kraftstoffinjektor 100 ist eine Zulaufbohrung 64 ausgebildet. Über die An inlet bore 64 is formed in the fuel injector 100. About the
Zulaufbohrung 64 wird der Kraftstoffdruck einerseits im Druckraum 8 wirksam, wo er über eine Druckschulter der Düsennadel 6 eine Kraft in Öffnungsrichtung der Düsennadel 6 ausübt. Andererseits wirkt dieser Kraftstoffdruck über eine in der Steuerhülse 62 ausgebildete Zulaufdrossel 65 im Steuerraum 63 und hält, unterstützt von der Kraft der Druckfeder 61, die Düsennadel 6 in ihrer Inlet bore 64, the fuel pressure on the one hand in the pressure chamber 8 is effective, where he exerts a force in the opening direction of the nozzle needle 6 via a pressure shoulder of the nozzle needle 6. On the other hand, this fuel pressure acts via an inlet throttle 65 formed in the control sleeve 62 in the control chamber 63 and, supported by the force of the compression spring 61, holds the nozzle needle 6 in its
Schließstellung. Der Kraftstoffinjektor 100 weist weiterhin ein Steuerventil 2 zur Steuerung desClosed position. The fuel injector 100 further includes a control valve 2 for controlling the
Drucks im Steuerraum 63 auf: Wenn ein Elektromagnet 70 angesteuert wird, wird ein Magnetanker 71 sowie eine mit dem Magnetanker 71 verbundene Ventilnadel 72 von einem an dem Ventilkörper 3 ausgebildeten Ventilsitz 73 abgehoben. Der Kraftstoff aus dem Steuerraum 63 kann auf diese Weise durch eine in der Drosselplatte 5 ausgebildete Ablaufdrossel 75 über den Ventilsitz 73 in einenPressure in the control chamber 63 on: When an electromagnet 70 is driven, a magnet armature 71 and connected to the armature 71 valve needle 72 is lifted by a formed on the valve body 3 valve seat 73. The fuel from the control chamber 63 can in this way by a formed in the throttle plate 5 outlet throttle 75 via the valve seat 73 in a
Ablaufkanal 76 abströmen. Das auf diese Weise bewirkte Absinken der hydraulischen Kraft auf die obere Stirnfläche der Düsennadel 6 führt zu einem Öffnen der Düsennadel 6. Der Kraftstoff aus dem Druckraum 8 gelangt so durch die Einspritzöffnungen 60 in den Brennraum der Brennkraftmaschine. Outflow channel 76 flow. The lowering of the hydraulic force in this way on the upper end face of the nozzle needle 6 leads to an opening of the nozzle needle 6. The fuel from the pressure chamber 8 thus passes through the injection openings 60 into the combustion chamber of the internal combustion engine.
Sobald der Elektromagnet 70 abgeschaltet wird, wird der Magnetanker 71 durch die Kraft einer weiteren Druckfeder 74 in Richtung des Ventilsitzes 73 gedrückt, so dass die Ventilnadel 72 an den Ventilsitz 73 gepresst wird. Auf diese Weise wird der Ablaufweg des Kraftstoffs über die Ablaufdrossel 75 und den Ventilsitz 73 gesperrt. Über die Zulaufdrossel 65 wird im Steuerraum 63 wieder As soon as the electromagnet 70 is switched off, the magnet armature 71 is pressed in the direction of the valve seat 73 by the force of a further compression spring 74, so that the valve needle 72 is pressed against the valve seat 73. In this way, the drainage path of the fuel via the outlet throttle 75 and the valve seat 73 is blocked. About the inlet throttle 65 is in the control chamber 63 again
Kraftstoff druck aufgebaut, wodurch die hydraulische Schließkraft erhöht wird. Dadurch wird die Düsennadel 6 in Richtung der Einspritzöffnungen 60 Fuel pressure built up, whereby the hydraulic closing force is increased. As a result, the nozzle needle 6 in the direction of the injection openings 60th
verschoben und verschließt diese. Der Einspritzvorgang ist dann beendet. moved and closed this. The injection process is then completed.
Um die Bauteile im Bereich des Brennraums zu kühlen, sind Kühlkanäle 30 in Ventilkörper 3, Drosselplatte 5 und Düsenkörper 16 des bekannten In order to cool the components in the region of the combustion chamber, cooling passages 30 are in valve body 3, throttle plate 5 and nozzle body 16 of the known
Kraftstoffinjektors 100 ausgebildet. So können speziell die Spitze der Düsennadel 6 und der Düsenkörper 16 gekühlt werden. In der Schnittdarstellung der Fig.l liegen die Kühlkanäle 30 teilweise in der Zulaufbohrung 64. Dies ist jedoch lediglich der Schnittdarstellung geschuldet, in den Ausführungen sind die Fuel injector 100 is formed. Thus, especially the tip of the nozzle needle 6 and the nozzle body 16 can be cooled. In the sectional view of Fig.l the cooling channels 30 are partially in the inlet bore 64. However, this is only due to the sectional view, in the embodiments are the
Kühlkanäle 30 von der Zulaufbohrung 64 getrennt. Cooling channels 30 separated from the inlet bore 64.
Erfindungsgemäß sind nun die Kühlkanäle 30 in einem einstückigen SD- gedruckten Düsenkörper 16 ausgebildet. Dadurch können zum einen nahezu beliebige Formen der Kühlkanäle realisiert werden, zum anderen kann auf eine aufwändige Konstruktion mit mehreren Bauteilen verzichtet werden. According to the invention, the cooling channels 30 are now formed in a one-piece SD printed nozzle body 16. As a result, on the one hand almost any shapes of the cooling channels can be realized, on the other hand can be dispensed with a complex construction with multiple components.
Fig.2 zeigt einen im 3D-Druck-Verfahren hergestellten Düsenkörper 16 in perspektivischer transparenter Ansicht. Die Zulaufbohrung 64 in den Druckraum 8 ist dabei nicht abgebildet. In dem Düsenkörper 16 sind wie üblich der 2 shows a nozzle body 16 produced in the 3D printing process in a perspective transparent view. The inlet bore 64 in the pressure chamber 8 is not shown. In the nozzle body 16 are as usual the
Druckraum 8 und die Einspritzöffnungen 60 ausgebildet. Weiterhin sind die Kühlkanäle 30 so ausgebildet, dass sie im Bereich der Düsenspitze 16a des Düsenkörpers 16, also nahe den Einspritzöffnungen 60 eine sehr große Fläche zum Düsenkörper 16 aufweisen. Pressure chamber 8 and the injection openings 60 formed. Furthermore, the cooling channels 30 are formed so that they have a very large area to the nozzle body 16 in the region of the nozzle tip 16a of the nozzle body 16, ie near the injection openings 60.
Die Kühlkanäle 30 umfassen eine Einlassniere 33 und eine Auslassniere 34 zum Anschluss an das dem Düsenkörper 16 benachbarte Bauteil, also beispielsweise die Drosselplatte 5 oder den Haltekörper 1, je nach Ausführung des The cooling channels 30 comprise an inlet kidney 33 and an outlet kidney 34 for connection to the component adjacent to the nozzle body 16, thus, for example, the throttle plate 5 or the holding body 1, depending on the design of the
Kraftstoffinjektors 100. Die externen Kühlanschlüsse des Kraftstoffinjektors 100 sind dabei in der Regel am Haltekörper 1 ausgebildet. Fuel injector 100. The external cooling connections of the fuel injector 100 are generally formed on the holding body 1.
Die Kühlkanäle 30 umfassen weiterhin einen länglichen Zulaufkanal 31, einen länglichen Ablaufkanal 32 und eine Kühlmatrix 35. Die Kühlmatrix 35 ist vorzugsweise mit einer großen Gesamtfläche zur wirksamen Kühlung der Düsenspitze 16a versehen, so dass eine größtmögliche Wärmeübertragung von der im Betrieb sehr heißen Düsenspitze 16a in das die Kühlkanäle 30 durchströmende Kühlmedium stattfinden kann. Dazu erstreckt sich die The cooling channels 30 further comprise an elongate inlet channel 31, an elongate outlet channel 32 and a cooling matrix 35. The cooling matrix 35 is preferably provided with a large total area for effective cooling of the nozzle tip 16a, so that maximum heat transfer from the very hot nozzle tip 16a in FIG that the cooling channels 30th can flow through cooling medium. This extends the
Kühlmatrix 35 vorzugsweise auch über den gesamten Umfang der Düsenspitze 16a. Cooling matrix 35 preferably also over the entire circumference of the nozzle tip 16a.
In vorteilhaften Ausführungen weist der Düsenkörper 16 einen In advantageous embodiments, the nozzle body 16 a
Konvektionsbereich 37 auf, wie in der Fig.2 die Kühlmatrix 35 umgebend dargestellt. Der Konvektionsbereich 37 ist aus einem anderen Material, beispielsweise Kupfer, als der restliche Düsenkörper 16 ausgeführt, aber dennoch aufgrund des 3D-Drucks mit diesem stoffschlüssig verbunden. Der Konvektionsbereich 37 weist eine besonders große Wärmeleitfähigkeit auf und dient dazu, eine möglichst große Wärmemenge von sehr heißen Bereichen des Düsenkörpers 16 zur Kühlmatrix 35 zu leiten. Convection region 37, as shown in Figure 2 surrounding the cooling matrix 35. The convection region 37 is made of a different material, for example copper, than the remaining nozzle body 16, but nevertheless connected to it in a material-locking manner due to the 3D printing. The convection region 37 has a particularly high thermal conductivity and serves to conduct the largest possible amount of heat from very hot regions of the nozzle body 16 to the cooling matrix 35.
Vorzugsweise ist der Konvektionsbereich 37 in der Nähe der Einspritzöffnungen 60 in der Düsenspitze 16a angeordnet, da dort üblicherweise die höchsten Temperaturen des Kraftstoffinjektors 100 herrschen. Preferably, the convection region 37 is arranged in the vicinity of the injection openings 60 in the nozzle tip 16a, since there usually the highest temperatures of the fuel injector 100 prevail.
In der Ausführung der Fig.2 ist die Kühlmatrix 35 zaunförmig ausgeführt. Weitere Ausführungsmöglichkeiten sind in den nachfolgenden Figuren 3 und 4 zu sehen. In the embodiment of Figure 2, the cooling matrix 35 is executed fence-shaped. Further embodiments are shown in the following figures 3 and 4.
Fig.3 zeigt ein Negativmodell der Kühlmatrix 35 - also die Geometrie des Kühlmediums - in Wendel- bzw. Mäanderform. Durch die Mäanderform wird die Kühlmatrix 35 besonders definiert durchströmt, da es keine Verzweigungen in Strömungsrichtung gibt. Stehendes Kühlmedium - und damit lokal geringe Wärmeübergangskoeffizienten - sind somit ausgeschlossen. 3 shows a negative model of the cooling matrix 35 - ie the geometry of the cooling medium - in helical or meander shape. Due to the meandering shape, the cooling matrix 35 flows through in a particularly defined manner, since there are no branches in the flow direction. Standing cooling medium - and thus locally low heat transfer coefficients - are thus excluded.
Fig.4 zeigt die Kühlmatrix 35 als Ringzylinder mit einer Vielzahl von 4 shows the cooling matrix 35 as a ring cylinder with a plurality of
Materialporen 36. Die Materialporen 36 sind somit Material des Düsenkörpers 16, beispielsweise Stahl. Dadurch ist die Konvektionsfläche der Kühlmatrix 35 besonders groß. Dementsprechend kann ein großer Wärmeeintrag von der Düsenspitze 16a in das Kühlmedium erfolgen. Alternativ kann die Kühlmatrix 35 auch ringförmig gestaltet sein. Material pores 36. The pores 36 are thus material of the nozzle body 16, for example steel. As a result, the convection surface of the cooling matrix 35 is particularly large. Accordingly, a large heat input from the nozzle tip 16a into the cooling medium can occur. Alternatively, the cooling matrix 35 may also be annular.
Durch das 3D-Druck-Verfahren als Herstellungsverfahren für den Düsenkörper 16 können nahezu beliebige Geometrien für die Kühlkanäle 30 realisiert werden und dennoch der Düsenkörper 16 einstückig ausgeführt sein. Dabei ist es auch möglich unterschiedliche Materialien für unterschiedliche Bereiche des As a result of the 3D printing method as a production method for the nozzle body 16, virtually any desired geometry for the cooling channels 30 can be realized, and nevertheless the nozzle body 16 can be made in one piece. And that's it possible different materials for different areas of the
Düsenkörpers 16 zu verwenden. Speziell hinsichtlich der Eigenschaft der Wärmeleitfähigkeit können so Wärmeflüsse in Richtung der Kühlkanäle 30 vorteilhaft beeinflusst werden. Mittels 3D-Druck werden dazu ein oder mehrere Konvektionsbereiche 37 appliziert, die eine besonders hohe Wärmeleitfähigkeit aufweisen und vorzugsweise vom Bereich der Einspritzöffnungen 60 bis zur Kühlmatrix 35 verlaufen. Nozzle body 16 to use. Especially with regard to the property of the thermal conductivity, heat flows in the direction of the cooling channels 30 can thus be advantageously influenced. One or more convection regions 37, which have a particularly high thermal conductivity and preferably run from the region of the injection openings 60 to the cooling matrix 35, are applied by means of 3D printing.
In einer Weiterbildung des Verfahrens wird zunächst ein Grundkörper des Düsenkörpers 16 mit einer konventionellen Fertigung - beispielsweise In one development of the method, first of all a main body of the nozzle body 16 with a conventional production - for example
Schmieden oder ein spanabtragendes Fertigungsverfahren - hergestellt. Optional können dabei die Kühlkanäle 30 schon in Teilkonturen vorhanden sein. Der äußere Bereich des Düsenkörpers 16, speziell der die Kühlmatrix 35 umgebende Bereich und gegebenenfalls auch der Konvektionsbereich 17, wird dann mittels 3D-Druck appliziert. Forging or a machining process - made. Optionally, the cooling channels 30 may already be present in partial contours. The outer region of the nozzle body 16, in particular the region surrounding the cooling matrix 35 and optionally also the convection region 17, is then applied by means of 3D printing.

Claims

p p
Ansprüche claims
1. Düsenkörper (16) für einen Kraftstoffinjektor (100) zum Einspritzen von A nozzle body (16) for a fuel injector (100) for injecting
Kraftstoff in den Brennraum einer Brennkraftmaschine, wobei der  Fuel in the combustion chamber of an internal combustion engine, wherein the
Düsenkörper (16) einstückig ausgeführt ist, wobei in dem Düsenkörper (16) ein Druckraum (8) ausgebildet ist, der über eine Zulaufbohrung (64) mit unter Hochdruck stehendem Kraftstoff versorgbar ist, wobei eine zumindest eine Einspritzöffnung (60) freigebende oder verschließende Düsennadel (6) in dem Druckraum (8) längsbeweglich angeordnet ist, wobei die zumindest eine Einspritzöffnung (60) in einer Düsenspitze (16a) des Düsenkörpers (16) ausgebildet ist, wobei in dem Düsenkörper (16) mit Kühlmedium  Nozzle body (16) is made in one piece, wherein in the nozzle body (16) a pressure chamber (8) is formed, which is supplied via an inlet bore (64) with fuel under high pressure, wherein at least one injection opening (60) releasing or occluding nozzle needle (6) is arranged longitudinally movable in the pressure chamber (8), wherein the at least one injection opening (60) in a nozzle tip (16a) of the nozzle body (16) is formed, wherein in the nozzle body (16) with cooling medium
durchströmbare Kühlkanäle (30) ausgebildet sind,  flow-through cooling channels (30) are formed,
dadurch gekennzeichnet, dass  characterized in that
die Kühlkanäle (30) eine in der Düsenspitze (16a) ausgebildete Kühlmatrix (35) umfassen.  the cooling channels (30) comprise a cooling matrix (35) formed in the nozzle tip (16a).
2. Düsenkörper (16) nach Anspruch 1, 2. nozzle body (16) according to claim 1,
dadurch gekennzeichnet,  characterized,
dass die Kühlmatrix (35) zaunförmig, mäanderförmig oder wendeiförmig gestaltet ist.  in that the cooling matrix (35) is designed in the shape of a fence, meandering or helical.
3. Düsenkörper (16) nach Anspruch 1, 3. nozzle body (16) according to claim 1,
dadurch gekennzeichnet,  characterized,
dass die Kühlmatrix (35) ringzylinderförmig gestaltet ist.  in that the cooling matrix (35) is ring-cylindrical.
4. Düsenkörper (16) nach einem der Ansprüche 1 bis 3, 4. nozzle body (16) according to one of claims 1 to 3,
dadurch gekennzeichnet,  characterized,
dass die Kühlmatrix (35) von Materialporen (36) der Düsenspitze (16a) durchsetzt ist.  in that the cooling matrix (35) is penetrated by material pores (36) of the nozzle tip (16a).
5. Düsenkörper (16) nach einem der Ansprüche 1 bis 4, 5. nozzle body (16) according to one of claims 1 to 4,
dadurch gekennzeichnet, dass die Kühlkanäle (30) einen länglichen Zulaufkanal (31) und einen länglichen Ablaufkanal (32) zum Zu- und Abführen von Kühlmedium in Kühlmatrix und aus der Kühlmatrix (35) umfassen. characterized, in that the cooling channels (30) comprise an elongated inlet channel (31) and an elongate outlet channel (32) for feeding and discharging cooling medium in the cooling matrix and from the cooling matrix (35).
6. Düsenkörper (16) nach Anspruch 5, 6. nozzle body (16) according to claim 5,
dadurch gekennzeichnet,  characterized,
dass die Kühlkanäle (30) eine Einlassniere (33) und eine Auslassniere (34) aufweisen, wobei die Einlassniere (33) und die Auslassniere (34) an einer der Düsenspitze (16a) gegenüberliegenden Stirnseite des Düsenkörpers (16) ausgebildet sind, wobei die Einlassniere (33) in den Zulaufkanal (31) übergeht und wobei die Auslassniere (34) in den Ablaufkanal (32) übergeht.  in that the cooling channels (30) have an inlet kidney (33) and an outlet kidney (34), wherein the inlet kidney (33) and the outlet kidney (34) are formed on an end face of the nozzle body (16) opposite the nozzle tip (16a) Inlet kidney (33) merges into the inlet channel (31) and wherein the outlet kidney (34) merges into the outlet channel (32).
7. Düsenkörper (16) nach einem der Ansprüche 1 bis 6, 7. nozzle body (16) according to any one of claims 1 to 6,
dadurch gekennzeichnet,  characterized,
dass der Düsenkörper (16) einen Konvektionsbereich (37) aufweist, wobei der Konvektionsbereich (37) eine größere Wärmeleitfähigkeit besitzt als der übrige Bereich des Düsenkörpers (16).  the nozzle body (16) has a convection region (37), wherein the convection region (37) has a greater thermal conductivity than the remaining region of the nozzle body (16).
8. Kraftstoffinjektor (100) mit einem Düsenkörper (16) nach einem der 8. fuel injector (100) having a nozzle body (16) according to one of
Ansprüche 1 bis 7,  Claims 1 to 7,
dadurch gekennzeichnet,  characterized,
dass der Kraftstoffinjektor (100) ein Steuerventil (2) zur Steuerung des Drucks eines Steuerraums (63) aufweist, wobei die Düsennadel (6) den Steuerraum (63) begrenzt.  in that the fuel injector (100) has a control valve (2) for controlling the pressure of a control chamber (63), the nozzle needle (6) delimiting the control chamber (63).
Verfahren zur Herstellung eines Düsenkörpers (100) nach einem Method for producing a nozzle body (100) according to one
Ansprüche 1 bis 7,  Claims 1 to 7,
dadurch gekennzeichnet, dass  characterized in that
der Düsenkörper (16) im 3D-Druck-Verfahren gefertigt wird.  the nozzle body (16) is manufactured in the 3D printing process.
10. Verfahren nach Anspruch 9, 10. The method according to claim 9,
dadurch gekennzeichnet, dass  characterized in that
das Verfahren folgende Verfahrensschritte aufweist:  the method comprises the following method steps:
Fertigung eines Grundkörpers des Düsenkörpers (16), vorzugsweise durch Schmieden Applizieren des die Kühlmatrix (35) nach außen umgebenden Materials der Düsenspitze (16a) mittels 3D-Druck-Verfahren. Production of a main body of the nozzle body (16), preferably by forging Application of the cooling matrix (35) to the outside surrounding material of the nozzle tip (16a) by means of 3D printing process.
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KR20190020798A (en) 2019-03-04
JP2019518170A (en) 2019-06-27
DE102016211477A1 (en) 2017-12-28
EP3475555B1 (en) 2020-10-28
JP6757805B2 (en) 2020-09-23
KR102303418B1 (en) 2021-09-24
CN109416007B (en) 2021-04-30
CN109416007A (en) 2019-03-01
WO2018001797A1 (en) 2018-01-04

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