EP1157208A1 - Injection nozzle with blind bore for internal combustion engine with rounded passage between the blind bore and the injector needle seat - Google Patents

Injection nozzle with blind bore for internal combustion engine with rounded passage between the blind bore and the injector needle seat

Info

Publication number
EP1157208A1
EP1157208A1 EP00954296A EP00954296A EP1157208A1 EP 1157208 A1 EP1157208 A1 EP 1157208A1 EP 00954296 A EP00954296 A EP 00954296A EP 00954296 A EP00954296 A EP 00954296A EP 1157208 A1 EP1157208 A1 EP 1157208A1
Authority
EP
European Patent Office
Prior art keywords
blind hole
needle seat
nozzle needle
injection nozzle
nozzle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP00954296A
Other languages
German (de)
French (fr)
Other versions
EP1157208B1 (en
Inventor
Friedrich Boecking
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
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1157208A1 publication Critical patent/EP1157208A1/en
Application granted granted Critical
Publication of EP1157208B1 publication Critical patent/EP1157208B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1806Injection 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

Definitions

  • Blind hole injection nozzle for internal combustion engines with a rounded transition between blind hole and nozzle needle seat
  • the invention is based on an injection nozzle for internal combustion engines with a blind hole having at least one spray hole and with a nozzle needle seat adjoining the blind hole.
  • Blind hole injection nozzles of the generic type have a large scatter in the flow resistance and thus also in the amount of fuel injected, especially in the partial stroke area of the nozzle needle. As a result, the emission and consumption behavior of many of the internal combustion engines equipped with these blind hole injection nozzles is not optimal.
  • the invention has for its object to provide a blind hole injection nozzle in which the scatter of the injection quantity in the partial stroke area of the nozzle needle is reduced in different examples of a blind hole injection nozzle of the same type and thus the consumption and emission behavior of the with the invention
  • a variant of an injection nozzle according to the invention provides that the nozzle needle seat is frustoconical, which results in a good sealing effect and good centering of the nozzle needle in the nozzle needle seat.
  • the cone angle of the nozzle needle seat is 60 °, so that a good sealing effect between the nozzle needle and the nozzle needle seat is achieved.
  • the cone angle of the nozzle needle is up to one degree, preferably 15-30 minutes, greater than the cone angle of the nozzle needle seat, so that the sealing surface is reduced and moved into the area of the largest diameter of the nozzle needle.
  • blind hole is a mini blind hole or a micro blind hole, so that the advantages according to the invention can also be used with these injection nozzles.
  • the transition between the spray hole and the blind hole is rounded, so that the throttling effect of the spray hole is reduced and spreads within a narrower tolerance range.
  • an injection nozzle for internal combustion engines with a blind hole having at least one spray hole characterized in that the transition between the spray hole and the blind hole is rounded. This measure reduces the scatter of the operating behavior of the injection nozzles.
  • Figure 1 a cross section through a blind hole injection nozzle
  • Figure 2 a characteristic of the hydraulic diameter of the
  • an injection nozzle 1 is shown with a conical blind hole 2.
  • the blind hole 2 can also be cylindrical or it can be a mini or micro blind hole 2. In the latter, the volume of the blind hole 2 is reduced compared to the type shown in FIG. 1. As a result, less fuel evaporates into the combustion chamber when the internal combustion engine is switched off.
  • the fuel not shown, reaches the combustion chamber, which is also not shown, from the blind hole 2 via a spray hole 3.
  • a conical nozzle needle seat 4 connects to the conical blind hole 2.
  • the nozzle needle seat 4 can have a cone angle of 60 °.
  • the blind hole 2 does not have to be conical, but can also be cylindrical.
  • a nozzle needle 5 rests on the nozzle needle seat 4.
  • FIG. 1 clearly shows that the cone angle of the nozzle needle 5 is larger than the cone angle of the nozzle needle seat 4.
  • the contact zone 6 between the nozzle needle 5 and the nozzle needle seat 4 lies in the region of the largest diameter of the nozzle needle 5 and
  • edge 7 On the left side of FIG. 1, a transition between blind hole 2 and nozzle needle seat 4 according to the prior art is shown as edge 7. This edge 7 arises when grinding the nozzle needle seat 4. Depending on the type of
  • the edge 7 can be a sharp burr or a smooth edge.
  • the flow resistance of the edge 7 is significantly influenced by the nature thereof.
  • a transition 8, rounded according to the invention, between blind hole 2 and nozzle needle seat 4 is shown.
  • the rounding of the transition 8 can be circular in cross section, for example, the radius being in the range from 0.01 mm to 0.1 mm, preferably 0.04 mm to 0.06 mm.
  • the rounding according to the invention means that the geometry of the transition 8 between the nozzle needle seat 4 and the blind hole 2 in the case of injection nozzles 1 of the same type only scatters within a very narrow tolerance range; d. H. the geometry of the transition 8 is defined and thus the flow resistance of the transition 8 is also clearly defined when the nozzle needle 5 is lifted from the nozzle needle seat 4 in the direction of a nozzle needle stroke 9. As a result, the scatter in the flow resistance of various specimens of injection nozzles according to the invention decreases sharply in the region of the transition 8 between nozzle needle seat 4 and blind hole 2.
  • transition 8 between nozzle needle seat 4 and blind hole 2 result in changes in the hydraulic diameter 10.
  • the spray hole 3 of the injection nozzle 1 is decisive for the hydraulic diameter of the injection nozzle 1.
  • the effects of different geometries of the transition 7 or 8 on the hydraulic diameter in the partial stroke area were indicated by the characteristic curves 11, 12 and 13.
  • the characteristic curve 12 shown in dashed lines represents a geometry of an edge 7 or a transition 8, which has a larger hydraulic diameter than the characteristic curve 11 and consequently has lower throttle losses.
  • the characteristic curve 13 shown in broken lines shows the effects of a geometry of a transition 7 or 8, which is stronger in relation to the characteristic curve 11 in FIG Has throttling effect.
  • the map of the internal combustion engine and the associated injection system is determined by measurements using one or more selected test copies.
  • the characteristic maps determined in this way are used as a basis for all injection systems of the same type.
  • the characteristic curve 11 is a measured characteristic curve and that this characteristic curve 11 is stored in the control unit of the injection system. It is also assumed that two injection nozzles taken from series production have the characteristic curves 12 and 13. If the injection nozzles 1 with the characteristic curves 12 and 13 cooperate with a control unit in which the characteristic curve 11 is stored, then the actual injection quantity in the partial stroke range does not match the optimal injection quantity according to the characteristic curve 11 measured in the test specimens, so that the output and / or the emission behavior of the internal combustion engine is deteriorated.

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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

Es wird eine Einspritzdüse (1) mit Sackloch (2) vorgeschlagen, bei der Übergang (8) zwischen Sackloch (2) und Düsennadelsitz (4) abgerundet ist. Dadurch verringert sich die Toleranz des Strömungswiderstands der Einspritzdüse (1) bei Teilhub der Düsennadel (5) und ermöglicht so eine genauere Bemessung der eingespritzten Kraftstoffmenge.

Description

Sackloch-Einspritzdüse für Brennkraftmaschinen mit abgerundetem Übergang zwischen Sackloch und DüsennadelsitzBlind hole injection nozzle for internal combustion engines with a rounded transition between blind hole and nozzle needle seat
Stand der TechnikState of the art
Die Erfindung geht aus von einer Einspritzdüse für Brennkraftmaschinen mit einem, mindestens ein Spritzloch aufweisenden Sackloch und mit einem an das Sackloch anschließenden Düsennadelsitz.The invention is based on an injection nozzle for internal combustion engines with a blind hole having at least one spray hole and with a nozzle needle seat adjoining the blind hole.
Sackloch-Einspritzdüsen der gattungsgemäßen Art weisen vor allem im Teilhubbereich der Düsennadel eine große Streuung des Strömungswiderstands und damit auch der eingespritzten Kraftstoffmenge auf. In Folge dessen ist das Emissions- und Verbrauchsverhalten vieler der mit diesen Sackloch- Einspritzdüsen ausgerüsteten Brennkraftmaschinen nicht optimal .Blind hole injection nozzles of the generic type have a large scatter in the flow resistance and thus also in the amount of fuel injected, especially in the partial stroke area of the nozzle needle. As a result, the emission and consumption behavior of many of the internal combustion engines equipped with these blind hole injection nozzles is not optimal.
Der Erfindung liegt die Aufgabe zugrunde, eine Sackloch- Einspritzdüse bereitzustellen, bei der die Streuung der Einspritzmenge im Teilhubbereich der Düsennadel bei verschiedenen Exemplaren einer Sackloch-Einspritzdüse gleicher Bauart verringert wird und somit das Verbrauchs- und Emissionsverhalten der mit der erfindungsgemäßenThe invention has for its object to provide a blind hole injection nozzle in which the scatter of the injection quantity in the partial stroke area of the nozzle needle is reduced in different examples of a blind hole injection nozzle of the same type and thus the consumption and emission behavior of the with the invention
Sackloch-Einspritzdüse ausgerüsteten Brennkraftmaschinen verbessert wird. Blind hole injection nozzle equipped internal combustion engines is improved.
Eine Variante einer erfindungsgemäßen Einspritzdüse sieht vor, dass der Düsennadelsitz kegelstumpfförmig ist, wodurch sich eine gute Dichtwirkung und eine gute Zentrierung der Düsennadel im Düsennadelsitz ergibt.A variant of an injection nozzle according to the invention provides that the nozzle needle seat is frustoconical, which results in a good sealing effect and good centering of the nozzle needle in the nozzle needle seat.
Bei einer anderen Ausführung der Erfindung beträgt der Kegelwinkel des Düsennadelsitzes 60°, so dass eine gute Dichtwirkung zwischen Düsennadel und Düsennadelsitz erzielt wird.In another embodiment of the invention, the cone angle of the nozzle needle seat is 60 °, so that a good sealing effect between the nozzle needle and the nozzle needle seat is achieved.
In Ergänzung der Erfindung ist der Kegelwinkel der Dusennadel bis zu einem Grad, vorzugsweise 15 - 30 Winkelminuten, größer als der Kegelwinkel des Düsennadelsitzes, so dass die Dichtfläche verkleinert und in den Bereich des größten Durchmessers der Düsennadel verlegt wird.In addition to the invention, the cone angle of the nozzle needle is up to one degree, preferably 15-30 minutes, greater than the cone angle of the nozzle needle seat, so that the sealing surface is reduced and moved into the area of the largest diameter of the nozzle needle.
Eine andere Ausführungsform sieht vor, dass das Sackloch ein Minisackloch oder ein Mikrosackloch ist, so dass die erfindungsgemäßen Vorteile auch bei diesen Einspritzdüsen nutzbar sind.Another embodiment provides that the blind hole is a mini blind hole or a micro blind hole, so that the advantages according to the invention can also be used with these injection nozzles.
Bei einer anderen Ausführungsform ist der Übergang zwischen Spritzloch und Sackloch abgerundet, so dass die Drosselwirkung des Spritzlochs verringert wird und innerhalb eines engeren Toleranzbereichs streut.In another embodiment, the transition between the spray hole and the blind hole is rounded, so that the throttling effect of the spray hole is reduced and spreads within a narrower tolerance range.
Die eingangs genannte Aufgabe wird auch gelöst durch eine Einspritzdüse für Brennkraftmaschinen mit einem, mindestens ein Spritzloch aufweisenden Sackloch, dadurch gekennzeichnet, dass der Übergang zwischen Spritzloch und Sackloch abgerundet ist . Durch diese Maßnahme wird die Streuung des Betriebsverhaltens der Einspritzdüsen verringert .The above-mentioned object is also achieved by an injection nozzle for internal combustion engines with a blind hole having at least one spray hole, characterized in that the transition between the spray hole and the blind hole is rounded. This measure reduces the scatter of the operating behavior of the injection nozzles.
Weitere Vorteile und vorteilhafte Ausgestaltungen der Erfindung sind der nachfolgenden Beschreibung, der Zeichnung und den Ansprüchen entnehmbar.Further advantages and advantageous configurations of the Invention can be found in the following description, the drawing and the claims.
Ein Ausführungsbeispiel des Gegenstands der Erfindung ist in der Zeichnung dargestellt und im Folgenden näher beschrieben. Es zeigen:An embodiment of the object of the invention is shown in the drawing and described in more detail below. Show it:
Figur 1: einen Querschnitt durch eine Sackloch- Einspritzdüse und Figur 2: eine Kennlinie des hydraulischen Durchmessers derFigure 1: a cross section through a blind hole injection nozzle and Figure 2: a characteristic of the hydraulic diameter of the
Einspritzdüse über dem Hub der Düsennadel .Injection nozzle over the stroke of the nozzle needle.
In Figur 1 ist eine Einspritzdüse 1 mit einem konischen Sackloch 2 dargestellt. Das Sackloch 2 kann auch zylindrisch sein oder es kann sich um eine Mini- oder Mikro-Sackloch 2 handeln. Bei letztgenannten ist das Volumen des Sacklochs 2 gegenüber der in Figur 1 dargestellten Bauart verringert. Dadurch verdunstet bei abgestellter Brennkraftmaschine weniger Kraftstoff in den Brennraum.In Figure 1, an injection nozzle 1 is shown with a conical blind hole 2. The blind hole 2 can also be cylindrical or it can be a mini or micro blind hole 2. In the latter, the volume of the blind hole 2 is reduced compared to the type shown in FIG. 1. As a result, less fuel evaporates into the combustion chamber when the internal combustion engine is switched off.
Über ein Spritzloch 3 gelangt der nicht dargestellte Kraftstoff aus dem Sackloch 2 in den ebenfalls nicht dargestellten Brennraum. An das konische Sackloch 2 schließt sich ein kegelstumpfförmiger Düsennadelsitz 4 an. Der Düsennadelsitz 4 kann einen Kegelwinkel von 60° haben. Das Sackloch 2 muß nicht konisch sein, sondern kann auch zylindrisch sein.The fuel, not shown, reaches the combustion chamber, which is also not shown, from the blind hole 2 via a spray hole 3. A conical nozzle needle seat 4 connects to the conical blind hole 2. The nozzle needle seat 4 can have a cone angle of 60 °. The blind hole 2 does not have to be conical, but can also be cylindrical.
An dem Düsennadelsitz 4 liegt eine Düsennadel 5 auf. InA nozzle needle 5 rests on the nozzle needle seat 4. In
Figur 1 ist deutlich zu erkennen, dass der Kegelwinkel der Düsennadel 5 größer als der Kegelwinkel des Düsennadelsitzes 4 ist. Dadurch liegt die Kontaktzone 6 zwischen Düsennadel 5 und Düsennadelsitz 4 im Bereich des größten Durchmessers der Düsennadel 5 und dieFIG. 1 clearly shows that the cone angle of the nozzle needle 5 is larger than the cone angle of the nozzle needle seat 4. As a result, the contact zone 6 between the nozzle needle 5 and the nozzle needle seat 4 lies in the region of the largest diameter of the nozzle needle 5 and
Flächenpressung zwischen Düsennadel 5 und Düsennadelsitz 4 wird erhöht. Die Differenz der Kegelwinkel von Düsennadel 5 und Düsennadelsitz 4 ist in Figur 1 übertrieben dargestellt. In der Regel ist die o. g. Differenz kleiner als 1 Grad und bewegt sich im Bereich von wenigen Winkelminuten.Surface pressure between nozzle needle 5 and nozzle needle seat 4 will be raised. The difference between the cone angles of the nozzle needle 5 and nozzle needle seat 4 is exaggerated in FIG. 1. As a rule, the above-mentioned difference is less than 1 degree and is in the range of a few angular minutes.
Auf der linken Seite von Figur 1 ist ein Übergang zwischen Sackloch 2 und Düsennadelsitz 4 nach dem Stand der Technik als Kante 7 dargestellt. Diese Kante 7 entsteht beim Schleifen des Düsennadelsitzes 4. Je nach Art derOn the left side of FIG. 1, a transition between blind hole 2 and nozzle needle seat 4 according to the prior art is shown as edge 7. This edge 7 arises when grinding the nozzle needle seat 4. Depending on the type of
Bearbeitung kann die Kante 7 ein scharfer Grat oder eine glatte Kante sein. Der Strömungswiderstand der Kante 7 wird wesentlich von der Beschaffenheit derselben beeinflusst.Machining, the edge 7 can be a sharp burr or a smooth edge. The flow resistance of the edge 7 is significantly influenced by the nature thereof.
Auf der rechten Seite von Figur 1 ist ein erfindungsgemäß abgerundeter Übergang 8 zwischen Sackloch 2 und Düsennadelsitz 4 dargestellt. Die Abrundung des Übergangs 8 kann im Querschnitt beispielsweise kreisförmig sein, wobei der Radius im Bereich von 0,01 mm bis 0,1 mm, vorzugsweise 0,04 mm bis 0,06 mm beträgt. Das erfindungsgemäße Abrunden führt jedenfalls dazu, dass die Geometrie des Übergangs 8 zwischen Düsennadelsitz 4 und Sackloch 2 bei Einspritzdüsen 1 gleicher Bauart nurmehr innerhalb eines sehr engen Toleranzbereichs streut; d. h. die Geometrie des Übergangs 8 ist definiert und damit ist auch der Strömungswiderstand des Übergangs 8 eindeutig definiert, wenn die Düsennadel 5 in Richtung eines Düsennadelhubs 9 vom Düsennadelsitz 4 abgehoben wird. Demzufolge nimmt die Streuung des Strömungswiderstands verschiedener Exemplare von erfindungsgemäßen Einspritzdüsen im Bereich des Übergangs 8 zwischen Düsennadelsitz 4 und Sackloch 2 stark ab.On the right-hand side of FIG. 1, a transition 8, rounded according to the invention, between blind hole 2 and nozzle needle seat 4 is shown. The rounding of the transition 8 can be circular in cross section, for example, the radius being in the range from 0.01 mm to 0.1 mm, preferably 0.04 mm to 0.06 mm. In any case, the rounding according to the invention means that the geometry of the transition 8 between the nozzle needle seat 4 and the blind hole 2 in the case of injection nozzles 1 of the same type only scatters within a very narrow tolerance range; d. H. the geometry of the transition 8 is defined and thus the flow resistance of the transition 8 is also clearly defined when the nozzle needle 5 is lifted from the nozzle needle seat 4 in the direction of a nozzle needle stroke 9. As a result, the scatter in the flow resistance of various specimens of injection nozzles according to the invention decreases sharply in the region of the transition 8 between nozzle needle seat 4 and blind hole 2.
Die Folgen der Streuung des Strömungswiderstands von Einspritzdüsen 1 im Bereich des Übergangs 7 oder 8 werden anhand des in Figur 2 dargestellten Diagramms veranschaulicht . ω J t to in o tn o cn o LΠThe consequences of the scattering of the flow resistance of injection nozzles 1 in the region of the transition 7 or 8 are illustrated using the diagram shown in FIG. 2. ω J t to in o tn o cn o LΠ
des Übergangs 8 zwischen Düsennadelsitz 4 und Sackloch 2 Änderungen des hydraulischen Durchmessers 10 zur Folge haben. Im Bereich des vollen Düsennadelhubs "c" ist das Spritzloch 3 der Einspritzdüse 1 maßgeblich für den hydraulischen Durchmesser der Einspritzdüse 1.of transition 8 between nozzle needle seat 4 and blind hole 2 result in changes in the hydraulic diameter 10. In the area of the full nozzle needle stroke “c”, the spray hole 3 of the injection nozzle 1 is decisive for the hydraulic diameter of the injection nozzle 1.
Gemäß dem vorstehend Gesagten führen Streuungen in der Geometrie der Kante 7 oder des Übergangs 8 zu einer Änderung der Kennlinie 11 der Einspritzdüse 1 vor allem im Teilhubbereich zwischen "a" und "b" .According to what has been said above, scattering in the geometry of the edge 7 or the transition 8 leads to a change in the characteristic curve 11 of the injection nozzle 1, especially in the partial stroke range between "a" and "b".
Nicht dargestellt wurde in Figur 1 die Möglichkeit, auch den Übergang zwischen Sackloch 2 und Spritzloch 3 abzurunden. Dadurch wird der Strömungswiderstand der Einspitzdüse verringert und es wird verhindert, dass beispielsweise beim Bohren des Spritzlochs 3, welches in der Regel von außen nach innen erfolgt, ein Grat stehenbleibt. Ein solcher Grat kann dazu führen, dass der Strömungswiderstand einer Einspritzdüse 1 vor allem bei vollem Düsennadelhub ansteigt. Die daraus resultierenden Nachteile entsprechen den bereits genannten und im folgenden weiter beschriebenen Nachteilen von Einspritzdüsen 1 bei denen der Strömungswiderstand der Kante 7 oder des Übergangs 8 stark streut.The possibility of also rounding off the transition between blind hole 2 and spray hole 3 was not shown in FIG. 1. As a result, the flow resistance of the injection nozzle is reduced and it is prevented that, for example, a burr remains when drilling the spray hole 3, which generally takes place from the outside inwards. Such a burr can lead to an increase in the flow resistance of an injection nozzle 1, especially when the nozzle stroke is full. The resulting disadvantages correspond to the disadvantages of injection nozzles 1 already mentioned and described further below, in which the flow resistance of the edge 7 or the transition 8 diffuses strongly.
In Figur 2 wurden andeutungsweise die Auswirkungen verschiedener Geometrien des Übergangs 7 oder 8 auf den hydraulischen Durchmesser im Teilhubbereich durch die Kennlinien 11, 12 und 13 dargestellt. Die gestrichelt dargestellte Kennlinie 12 repräsentiert eine Geometrie einer Kante 7 oder eines Übergangs 8, welche im Vergleich zu der Kennlinie 11 einen größeren hydraulischen Durchmesser hat und demzufolge geringere Drosselverluste aufweist. Die gestrichelt dargestellte Kennlinie 13 zeigt die Auswirkungen einer Geometrie eines Übergangs 7 oder 8, welche relativ zu der Kennlinie 11 in Figur 2 eine stärkere Drosselwirkung hat.In FIG. 2, the effects of different geometries of the transition 7 or 8 on the hydraulic diameter in the partial stroke area were indicated by the characteristic curves 11, 12 and 13. The characteristic curve 12 shown in dashed lines represents a geometry of an edge 7 or a transition 8, which has a larger hydraulic diameter than the characteristic curve 11 and consequently has lower throttle losses. The characteristic curve 13 shown in broken lines shows the effects of a geometry of a transition 7 or 8, which is stronger in relation to the characteristic curve 11 in FIG Has throttling effect.
Bei in Serie gefertigten Brennkraftmaschinen wird das Kennfeld der Brennkraftmaschine und des zugehörigen Einspritzsystems anhand eines oder mehrerer ausgewählter Testexemplare durch Messungen ermittelt. Die solcherart ermittelten Kennfelder werden allen bauartgleichen Einspritzsystemen zugrundegelegt .In the case of mass-produced internal combustion engines, the map of the internal combustion engine and the associated injection system is determined by measurements using one or more selected test copies. The characteristic maps determined in this way are used as a basis for all injection systems of the same type.
Im Folgenden wird angenommen, dass die Kennlinie 11 eine gemessene Kennlinie ist, und dass diese Kennlinie 11 in dem Steuergerät des Einspritzsystems abgespeichert ist. Weiter wird unterstellt, dass zwei der Serienfertigung entnommene Einspritzdüsen die Kennlinien 12 und 13 haben. Wenn nun die Einspritzdüsen 1 mit den Kennlinien 12 und 13 mit einer Steuergerät zusammenwirken, in dem die Kennlinie 11 abgespeichert ist, dann stimmt die tatsächliche Einspritzmenge im Teilhubbereich nicht mit der bei den Testexemplaren gemessenen optimalen Einspritzmenge gemäß der Kennlinie 11 überein, so dass die Leistung und/oder das Emissionsverhalten der Brennkraftmaschine verschlechtert wird.It is assumed below that the characteristic curve 11 is a measured characteristic curve and that this characteristic curve 11 is stored in the control unit of the injection system. It is also assumed that two injection nozzles taken from series production have the characteristic curves 12 and 13. If the injection nozzles 1 with the characteristic curves 12 and 13 cooperate with a control unit in which the characteristic curve 11 is stored, then the actual injection quantity in the partial stroke range does not match the optimal injection quantity according to the characteristic curve 11 measured in the test specimens, so that the output and / or the emission behavior of the internal combustion engine is deteriorated.
Im Umkehrschluss kann man sagen, dass durch das Abrunden des Übergangs 8 zwischen Düsennadelsitz 4 und Sackloch 2 die Streuung der Kennlinien 11, 12 und 13 verringert wird. Damit wird die Übereinstimmung zwischen der im Steuergerät abgespeicherten Kennlinie 11 und der Kennlinien 11 und 12 von zwei der Serienfertigung entnommenen Einspritzdüsen deutlich verbesssert. Die Übereinstimmung kann beispielsweise um den Faktor 2 bis 3 verbessert werden. In Folge dessen entspricht die tatsächlich eingespritzte Kraftstoffmenge genau der von dem Steuergerät vorgegebenen Einspritzmenge und das Verbrauchs- und Emissionsverhalten der Brennkraftmaschine ist optimal. Alle in der Beschreibung, den nachfolgenden Ansprüchen und der Zeichnung dargestellten Merkmale können sowohl einzeln als auch in beliebiger Kombination miteinander erfindungswesentlich sein. Conversely, it can be said that by rounding the transition 8 between the nozzle needle seat 4 and the blind hole 2, the scatter of the characteristic curves 11, 12 and 13 is reduced. This significantly improves the correspondence between the characteristic curve 11 stored in the control unit and the characteristic curves 11 and 12 of two injection nozzles taken from series production. The match can be improved by a factor of 2 to 3, for example. As a result, the quantity of fuel actually injected corresponds exactly to the injection quantity specified by the control unit, and the consumption and emission behavior of the internal combustion engine is optimal. All the features shown in the description, the following claims and the drawing can be essential to the invention both individually and in any combination with one another.

Claims

Ansprüche Expectations
1. Einspritzdüse (1) für Brennkraftmaschinen mit einem, mindestens ein Spritzloch (3) aufweisenden Sackloch (2) und mit einem an das Sackloch (2) anschließenden Düsennadelsitz (4), dadurch gekennzeichnet, dass der Übergang (8) zwischen Düsennadelsitz (4) und Sackloch (2) abgerundet ist.1. Injection nozzle (1) for internal combustion engines with a blind hole (2) having at least one spray hole (3) and with a nozzle needle seat (4) adjoining the blind hole (2), characterized in that the transition (8) between the nozzle needle seat (4 ) and blind hole (2) is rounded.
2. Einspritzdüse (1) nach Anspruch 1, dadurch gekennzeichnet, dass der Übergang (8) zwischen Düsennadelsitz (4) und Sackloch (2) mit einem Radius zwischen 0,01 mm und 0,1 mm, vorzugsweise zwischen 0,04 mm und 0,06 mm abgerundet ist.2. Injection nozzle (1) according to claim 1, characterized in that the transition (8) between the nozzle needle seat (4) and blind hole (2) with a radius between 0.01 mm and 0.1 mm, preferably between 0.04 mm and 0.06 mm is rounded.
3. Einspritzdüse (1) nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Sackloch (2) konisch ist.3. Injection nozzle (1) according to claim 1 or 2, characterized in that the blind hole (2) is conical.
4. Einspritzdüse (1) nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Sackloch (2) zylindrisch ist.4. Injection nozzle (1) according to claim 1 or 2, characterized in that the blind hole (2) is cylindrical.
5. Einspritzdüse (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Düsennadelsitz (4) kegelstumpfförmig ist.5. Injection nozzle (1) according to one of the preceding claims, characterized in that the nozzle needle seat (4) is frustoconical.
6. Einspritzdüse (1) nach Anspruch 5, dadurch gekennzeichnet, dass der Kegelwinkel des Düsennadelsitzes (4) 60° beträgt.6. Injection nozzle (1) according to claim 5, characterized in that the cone angle of the nozzle needle seat (4) is 60 °.
7. Einspritzdüse (1) nach einem der Ansprüche 5 oder 6, dadurch gekennzeichnet, dass der Kegelwinkel der Düsennnadel (5) bis zu einem Grad, vorzugsweise 15 bis 30 Winkelminuten, größer als der Kegelwinkel des Düsennadelsitzes (4) ist.7. Injection nozzle (1) according to one of claims 5 or 6, characterized in that the cone angle of the nozzle needle (5) is greater than the cone angle of the nozzle needle seat (4) by up to one degree, preferably 15 to 30 angular minutes.
8. Einspritzdüse (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Sackloch (2) ein Mini-Sackloch oder ein Mikro-Sackloch ist.8. Injection nozzle (1) according to one of the preceding claims, characterized in that the blind hole (2) is a mini blind hole or a micro blind hole.
9. Einspritzdüse (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Übergang zwischen Spritzloch (3) und Sackloch (2) abgerundet ist.9. Injection nozzle (1) according to one of the preceding claims, characterized in that the transition between spray hole (3) and blind hole (2) is rounded.
10. Einspritzdüse (1) für Brennkraftmaschinen mit einem, mindestens ein Spritzloch (3) aufweisenden Sackloch (2), dadurch gekennzeichnet, dass der Übergang zwischen Spritzloch (3) und Sackloch (2) abgerundet ist. 10. Injection nozzle (1) for internal combustion engines with a, at least one spray hole (3) having blind hole (2), characterized in that the transition between spray hole (3) and blind hole (2) is rounded.
EP00954296A 1999-07-08 2000-06-29 Injection nozzle with blind bore for internal combustion engine with rounded passage between the blind bore and the injector needle seat Expired - Lifetime EP1157208B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19931761A DE19931761A1 (en) 1999-07-08 1999-07-08 Blind hole injection nozzle for internal combustion engines with a rounded transition between blind hole and nozzle needle seat
DE19931761 1999-07-08
PCT/DE2000/002125 WO2001004490A1 (en) 1999-07-08 2000-06-29 Injection nozzle with blind bore for internal combustion engine with rounded passage between the blind bore and the injector needle seat

Publications (2)

Publication Number Publication Date
EP1157208A1 true EP1157208A1 (en) 2001-11-28
EP1157208B1 EP1157208B1 (en) 2005-03-16

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ID=7914036

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00954296A Expired - Lifetime EP1157208B1 (en) 1999-07-08 2000-06-29 Injection nozzle with blind bore for internal combustion engine with rounded passage between the blind bore and the injector needle seat

Country Status (7)

Country Link
US (1) US6695230B1 (en)
EP (1) EP1157208B1 (en)
JP (1) JP2003504554A (en)
KR (1) KR100737711B1 (en)
CZ (1) CZ295060B6 (en)
DE (2) DE19931761A1 (en)
WO (1) WO2001004490A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10307873A1 (en) * 2003-02-25 2004-09-02 Robert Bosch Gmbh Blind hole and seat hole injection nozzle for an internal combustion engine with a transition cone between the blind hole and nozzle needle seat
JP5976586B2 (en) * 2013-03-29 2016-08-23 株式会社デンソー Fuel injection nozzle
JP2014194197A (en) * 2013-03-29 2014-10-09 Denso Corp Fuel injection nozzle
JP6109758B2 (en) * 2014-01-30 2017-04-05 株式会社日本自動車部品総合研究所 Fuel injection nozzle
JP7167663B2 (en) 2018-11-28 2022-11-09 株式会社デンソー fuel injector

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2927737A (en) * 1952-04-12 1960-03-08 Bosch Gmbh Robert Fuel injection valves
US3836080A (en) * 1973-09-10 1974-09-17 Ambac Ind Fuel injection nozzle
DE2451536A1 (en) * 1974-10-30 1976-05-06 Bosch Gmbh Robert PROCESS FOR CARBURIZING WORKPIECES OF STEEL
DE2557772A1 (en) * 1975-12-20 1977-06-23 Kloeckner Humboldt Deutz Ag FUEL INJECTION VALVE
US4417694A (en) * 1980-10-22 1983-11-29 The Bendix Corporation Injector valve with contoured valve seat and needle valve interface
DE3605082A1 (en) * 1986-02-18 1987-08-20 Bosch Gmbh Robert FUEL INJECTION NOZZLE FOR INTERNAL COMBUSTION ENGINES
DE3733604A1 (en) * 1987-10-05 1989-04-13 Bosch Gmbh Robert HOLE BODY FOR A FUEL INJECTION VALVE
WO1989003935A1 (en) * 1987-10-30 1989-05-05 Nauchno-Proizvodstvennoe Obiedinenie Po Toplivnoi Pulverizer of diesel nozzle
DE3740283A1 (en) * 1987-11-27 1989-06-08 Man B & W Diesel Gmbh Injection valve
GB8827107D0 (en) * 1988-11-19 1988-12-21 Lucas Ind Plc Fuel injection nozzle
US5026462A (en) * 1990-03-06 1991-06-25 Ail Corporation Method and apparatus for electrochemical machining of spray holes in fuel injection nozzles
JPH04314961A (en) * 1991-04-11 1992-11-06 Nissan Motor Co Ltd Fuel injection nozzle
JP2568323B2 (en) * 1991-06-28 1997-01-08 株式会社日立製作所 Nozzle with valve seat, method of manufacturing the same, and solenoid valve
DE19507188C1 (en) * 1995-03-02 1996-08-14 Bosch Gmbh Robert Fuel injection valve for internal combustion engines
JPH09177640A (en) * 1995-12-15 1997-07-11 Caterpillar Inc Combustion exhaust emission control system by fuel injector having high suck capacity and its method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0104490A1 *

Also Published As

Publication number Publication date
DE19931761A1 (en) 2001-01-18
EP1157208B1 (en) 2005-03-16
WO2001004490A1 (en) 2001-01-18
KR20010079756A (en) 2001-08-22
US6695230B1 (en) 2004-02-24
CZ2001820A3 (en) 2001-12-12
KR100737711B1 (en) 2007-07-11
DE50009793D1 (en) 2005-04-21
CZ295060B6 (en) 2005-05-18
JP2003504554A (en) 2003-02-04

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