EP1373713B2 - Fuel injection device, especially injector, for internal combustion engines - Google Patents

Fuel injection device, especially injector, for internal combustion engines Download PDF

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Publication number
EP1373713B2
EP1373713B2 EP02726070.2A EP02726070A EP1373713B2 EP 1373713 B2 EP1373713 B2 EP 1373713B2 EP 02726070 A EP02726070 A EP 02726070A EP 1373713 B2 EP1373713 B2 EP 1373713B2
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EP
European Patent Office
Prior art keywords
annular
fuel injection
spherical segment
injection device
injection housing
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Expired - Lifetime
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EP02726070.2A
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German (de)
French (fr)
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EP1373713A1 (en
EP1373713B1 (en
Inventor
Michael Kurz
Gerd Wahr
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Robert Bosch GmbH
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Robert Bosch GmbH
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    • 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
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • 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

Definitions

  • the invention relates to a fuel injection device, in particular injector, for internal combustion engines, with a base body, with an injection housing, with a clamping device which comprises at least one clamping nut with a ring land and an annular shoulder on the injection housing and which axially clamps the injection housing with the base body, with a fuel inlet and at least one valve element.
  • Such a fuel injection device is known from DE 197 29 843 A1 known.
  • a fuel injection valve for internal combustion engines is shown, which has a clamping nut which rests with an inner, conical annular web on an annular shoulder of an injection housing. In this way, the injection housing is clamped against the base body.
  • the annular shoulder is formed curved on its side facing the annular web so that at a predetermined distance from the longitudinal axis of the fuel injector results in an annular circumferential support point at which the conical annular ridge rests in the mounted state.
  • EP 0 890 734 A2 describes a fuel injector in which an annular surface of the tensioner is formed in the manner of a portion of a circular section ring.
  • the present invention has the object to improve the seal between the injection housing and the base body in a fuel injection device of the type mentioned. Furthermore, the scatter of the injection quantity should be reduced. In addition, the wear on the nozzle needle guide 5 and on the nozzle needle seat is reduced by the uniform axial tensioning.
  • the clamping device has at least one ring land of the clamping nut facing annular surface which is convexly curved in the manner of a spherical segment surface, the center of which is arranged on a longitudinal axis of the fuel injection device.
  • the surface pressure in the contact area between the base body and the injection housing is made uniform, the occurrence of leaks in this contact area is less likely. Moreover, the likelihood of injector deformation is also less, such that the amount of fuel injection varies less from one fuel injector to the other, if any.
  • the clamping device comprises a complementary to the convex spherical segment surface concave spherical segment surface on which the convex spherical segment surface is applied flat.
  • a kind of "ball socket ball joint” is created.
  • the alignment of the injection housing relative to the base body during assembly of the fuel injection device is particularly low-power and easy. This leads to a particularly uniform surface pressure at the junction between the base body and injection housing.
  • the clamping device has a convex spherical segment surface facing oblique and flat annular surface against which the spherical segment surface is linear.
  • Such an oblique annular surface is easy to manufacture and enables the low-cost production of the fuel injection device according to the invention.
  • the oblique annular surface forms an angle of approximately 120 °. At such an angle, the axial forces necessary for a secure connection and sealing are still well transferred, and on the other hand, such a slope provides a good fit for the convex spherical segment surface.
  • the clamping device comprises an annular disc which is arranged between the injection housing and the clamping nut is, wherein either the convex spherical segment surface or the oblique annular surface is formed on the annular disc.
  • annular disk allows, for example, the use of a conventional clamping nut, which keeps the production costs of the fuel injection device according to the invention low.
  • the injection housing may also have a conventional annular shoulder, on which neither a bevel nor a spherical segment surface is present when the annular disc according to the invention is provided.
  • the convex spherical segment surface is formed on the annular shoulder of the injection housing.
  • the injection housing is in any case a relatively complex part, at which the additional processing step means a comparatively little additional effort.
  • the alignment of the injection housing relative to the base body is further facilitated if the convex spherical segment surface and cooperating with this oblique annular surface with a low-friction layer, preferably Teflon, are provided.
  • Fig. 1 It carries a base body 12, an injection housing 14 and a clamping nut 16. On the base body 12, a thread 18 is present, with which the clamping nut 16 is screwed.
  • the injection housing 14 has a recess extending in its longitudinal direction 20 is provided, in which a valve needle 22 is arranged.
  • a fuel inlet 24 supplies an annular space 26 between valve needle 22 and recess 20 with fuel.
  • the fuel injector 10 generally serves to inject fuel directly into the combustion chamber of an internal combustion engine. With it gasoline or diesel fuel can be injected.
  • the clamping nut 16 (see. Fig. 3-5 ) It is a hollow cylindrical part, which has a wall portion 30 and a in the in Fig. 1 lower end formed radially inwardly facing annular web 32 includes.
  • Upper surface 33 of the annular ridge 32 and the inner surface of the wall portion 30 are at an angle of approximately 90 ° to each other.
  • the injection housing 14 has a larger diameter portion 34 and a smaller diameter portion 36.
  • the diameter of the smaller-diameter portion 36 is slightly smaller than the diameter of the opening 38 bounded by the annular land 32 of the tightening nut 16.
  • the diameter of the portion 34 of the injection housing 14 is slightly smaller than the inner diameter of the wall portion 30 of the tightening nut 16.
  • annular shoulder 40 is formed between the portion 34 and the portion 36 of the injection housing 14.
  • the annular shoulder 40 is convexly curved in the manner of a spherical segment surface 41.
  • the center M of the spherical segment surface 41 lies on the longitudinal axis 42 of the fuel injector 10.
  • the radius of the sphere from which the spherical segment surface 41 is cut out is R.
  • annular disc 44 is present (see. Fig. 2 ).
  • the inner diameter of the annular disc 44 is slightly larger than the outer diameter of the portion 36 of the injection housing 14, whereas the outer diameter of the annular disc 44 is slightly smaller than the inner diameter of the wall portion 30 of the clamping nut 16.
  • the top 45 of the annular disc 44 is concave Ball segment surface 46 is formed, which is complementary to the convex spherical segment surface 41 on the injection housing 14.
  • the underside of the annular disc 44 has a conical depression.
  • the radius of the ball from which the concave spherical segment surface 46 is cut is thus also R, and the center M of this ball is also located on the longitudinal axis 42 of the fuel injector 10.
  • Both spherical segment surfaces 41 and 46 are coated with a low-friction Teflon layer (not visible) ) Mistake.
  • the ball segment surfaces 41 and 46 thus cooperate in the manner of a ball socket ball joint.
  • the clamping nut 16 with the annular web 32, the annular shoulder 40 on the injection housing 14 and the annular disc 44 together form a clamping device 48th
  • the assembly of the fuel injection device 10 by means of the tensioning device 48 proceeds as follows:
  • the annular disc 44 is pushed over from below over the portion 36 of the injection housing 14.
  • the concave spherical segment surface 46 of the annular disc 44 upwards, ie to the annular shoulder 40 of the injection housing 14 to.
  • the clamping nut 16 is pushed over the injection housing 14, wherein the annular web 32 is arranged below.
  • the clamping nut 16 is now bolted to the thread 18 on the base body 12.
  • a sealing element such as an O-ring, may be present between the two parts.
  • fuel injection device 10 is the in Fig. 6 upwardly facing surface of the annular web 32 of the clamping nut 16 is formed as an inclined annular surface 50.
  • the oblique annular surface 50 encloses an angle of approximately 120 ° (cf. Fig. 9 ).
  • the annular shoulder 40 of the injection housing 14 is not convexly curved in the present embodiment, but extends from the smaller diameter portion 36 of the injection housing 14 in a straight line and at an angle of approximately 90 ° radially outward.
  • the annular disc 44 in turn has on its underside an annular surface which is convexly curved in the manner of a spherical segment surface 41.
  • the top 45 of the annular disc 44 has a depression.

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

Description

Stand der TechnikState of the art

Die Erfindung betrifft eine Kraftstoff-Einspritzvorrichtung, insbesondere Injektor, für Brennkraftmaschinen, mit einem Basiskörper, mit einem Einspritzgehäuse, mit einer Spanneinrichtung, welche mindestens eine Spannmutter mit einem Ringsteg und eine Ringschulter am Einspritzgehäuse umfasst und welche das Einspritzgehäuse axial mit dem Basiskörper verspannt, mit einem Kraftstoff-Einlass und mit mindestens einem Ventilelement.The invention relates to a fuel injection device, in particular injector, for internal combustion engines, with a base body, with an injection housing, with a clamping device which comprises at least one clamping nut with a ring land and an annular shoulder on the injection housing and which axially clamps the injection housing with the base body, with a fuel inlet and at least one valve element.

Eine derartige Kraftstoff-Einspritzvorrichtung ist aus der DE 197 29 843 A1 bekannt. Dort ist ein Kraftstoffeinspritzventil für Brennkraftmaschinen gezeigt, welches eine Spannmutter aufweist, die mit einem inneren, konisch ausgebildeten Ringsteg an einer Ringschulter eines Einspritzgehäuses anliegt. Auf diese Weise wird das Einspritzgehäuse gegen den Basiskörper verspannt. Die Ringschulter ist auf ihrer dem Ringsteg zugewandten Seite derart gekrümmt ausgebildet, dass sich in einem vorgegebenen Abstand von der Längsachse der Kraftstoff-Einspritzvorrichtung ein ringförmig umlaufender Auflagepunkt ergibt, an dem der konische Ringsteg im montierten Zustand anliegt.Such a fuel injection device is known from DE 197 29 843 A1 known. There, a fuel injection valve for internal combustion engines is shown, which has a clamping nut which rests with an inner, conical annular web on an annular shoulder of an injection housing. In this way, the injection housing is clamped against the base body. The annular shoulder is formed curved on its side facing the annular web so that at a predetermined distance from the longitudinal axis of the fuel injector results in an annular circumferential support point at which the conical annular ridge rests in the mounted state.

EP 0 890 734 A2 beschreibt eine Kraftstoff-Einspritzvorrichtung, bei der eine Ringfläche der Spanneinrichtung in der Art eines Bereichs eines Ringes mit kreisförmigem Querschnitt gebildet ist. EP 0 890 734 A2 describes a fuel injector in which an annular surface of the tensioner is formed in the manner of a portion of a circular section ring.

Die vorliegende Erfindung hat die Aufgabe, bei einer Kraftstoff-Einspritzvorrichtung der eingangs genannten Art die Abdichtung zwischen dem Einspritzgehäuse und dem Basiskörper zu verbessern. Ferner sollen die Streuungen der Einspritzmenge verringert werden. Zudem wird durch die gleichmäßige axiale Verspannnung der Verschleiss an der Düsennadelführung5 sowie am Düsennadelsitz verringert.The present invention has the object to improve the seal between the injection housing and the base body in a fuel injection device of the type mentioned. Furthermore, the scatter of the injection quantity should be reduced. In addition, the wear on the nozzle needle guide 5 and on the nozzle needle seat is reduced by the uniform axial tensioning.

Diese Aufgabe wird bei einer Kraftstoff-Einspritzvorrichtung der eingangs genannten Art dadurch gelöst, dass die Spanneinrichtung mindestens eine dem Ringsteg der Spannmutter zugewandte Ringfläche aufweist, die in der Art einer Kugelsegmentfläche konvex gekrümmt ist, deren Mittelpunkt auf einer Längsachse der Kraftstoff-Einspritzvorrichtung angeordnet ist.This object is achieved in a fuel injection device of the type mentioned above in that the clamping device has at least one ring land of the clamping nut facing annular surface which is convexly curved in the manner of a spherical segment surface, the center of which is arranged on a longitudinal axis of the fuel injection device.

Vorteile der ErfindungAdvantages of the invention

Erfindungsgemäß wurde festgestellt, dass gewisse Undichtigkeiten zwischen dem Einspritzgehäuse und dem Basiskörper dadurch auftreten können, dass die Anpresskraft an der Kontaktfläche zwischen Basiskörper und Einspritzgehäuse nicht gleichmäßig verläuft. Sind Stellen vorhanden, an denen die Anpresskraft nur gering ist, ist an diesen Stellen auch die Abdichtung nur relativ gering. An anderen Stellen kann es dagegen zu Kraftspitzen kommen, welche zu einer Verformung des Einspritzgehäuses führen. Dies kann wiederum die Ursache sein für Streuungen bei der Einspritzmenge von einer Kraftstoff-Einspritzvorrichtung zur anderen. Die Ursache für die ungleichmäßige Kraftverteilung liegt in Planlauftoleranzen einerseits am Körpergewinde des Basiskörpers und andererseits am Gewinde der Spannmutter selbst.According to the invention, it has been found that certain leaks between the injection housing and the base body can occur because the contact pressure on the contact surface between the base body and the injection housing is not uniform. Are places available where the contact pressure is low, at these points, the seal is relatively low. In other places, however, it can lead to force peaks, which lead to a deformation of the injection housing. This, in turn, may be the cause of variations in the amount of injection from one fuel injector to another. The cause of the uneven force distribution lies in axial tolerances on the one hand on the body thread of the base body and on the other hand on the thread of the clamping nut itself.

Derartige Ungleichmäßigkeiten der axialen Spannkraft zwischen Basiskörper und Einspritzgehäuse werden bei der erfindungsgemäßen Kraftstoff-Einspritzvorrichtung weitgehend vermieden. Dies wird dadurch erreicht, dass sich das Einspritzgehäuse aufgrund der vorhandenen Kugelsegmentfläche bei der Montage automatisch so ausrichtet, dass die Kraft über den Umfang der Spanneinrichtung im Wesentlichen gleichmäßig verteilt ist. Durch die Kugelsegmentfläche wird also eine Art Gelenkfunktion bereitgestellt, welche ein selbsttätiges und optimales Ausrichten des Einspritzgehäuses gegenüber Basiskörper bei der Montage der Kraftstoff-Einspritzvorrichtung ermöglicht.Such irregularities of the axial clamping force between the base body and injection housing are largely avoided in the fuel injection device according to the invention. This is achieved by virtue of the fact that the injection housing, due to the existing spherical segment surface, automatically aligns during assembly in such a way that the force is distributed essentially uniformly over the circumference of the clamping device. By the spherical segment surface thus a kind of joint function is provided, which allows an automatic and optimal alignment of the injection housing relative to the base body during assembly of the fuel injection device.

Da die Flächenpressung im Kontaktbereich zwischen Basiskörper und Einspritzgehäuse vergleichmäßigt ist, ist das Auftreten von undichten Stellen in diesem Kontaktbereich weniger wahrscheinlich. Darüber hinaus ist die Wahrscheinlichkeit von Verformungen des Einspritzgehäuses ebenfalls geringer, so dass die Einspritzmenge von einer Kraftstoff-Einspritzvorrichtung zur anderen - wenn überhaupt - weniger variiert.Since the surface pressure in the contact area between the base body and the injection housing is made uniform, the occurrence of leaks in this contact area is less likely. Moreover, the likelihood of injector deformation is also less, such that the amount of fuel injection varies less from one fuel injector to the other, if any.

Vorteilhafte Weiterbildungen der Erfindung sind in Unteransprüchen angegeben.Advantageous developments of the invention are specified in subclaims.

Bei einem nicht erfindungsgemäßen Einspritzventil umfasst die Spanneinrichtung eine zu der konvexen Kugelsegmentfläche komplementäre konkave Kugelsegmentfläche, an der die konvexe Kugelsegmentfläche flächig anliegt. Hierdurch wird eine Art "Kugelpfannen-Kugelkopf-Gelenk" geschaffen. In diesem Fall erfolgt das Ausrichten des Einspritzgehäuses gegenüber dem Basiskörper bei der Montage der Kraftstoff-Einspritzvorrichtung besonders kraftarm und leicht. Dies führt zu einer besonders gleichmäßigen Flächenpressung an der Verbindungsstelle zwischen Basiskörper und Einspritzgehäuse.In a non-inventive injection valve, the clamping device comprises a complementary to the convex spherical segment surface concave spherical segment surface on which the convex spherical segment surface is applied flat. As a result, a kind of "ball socket ball joint" is created. In this case, the alignment of the injection housing relative to the base body during assembly of the fuel injection device is particularly low-power and easy. This leads to a particularly uniform surface pressure at the junction between the base body and injection housing.

Möglich ist aber auch, dass die Spanneinrichtung eine der konvexen Kugelsegmentfläche zugewandte schräge und ebene Ringfläche aufweist, an der die Kugelsegmentfläche linienhaft anliegt. Eine derartige schräge Ringfläche ist leicht herzustellen und ermöglicht die preiswerte Fertigung der erfindungsgemäßen Kraftstoff-Einspritzvorrichtung.But it is also possible that the clamping device has a convex spherical segment surface facing oblique and flat annular surface against which the spherical segment surface is linear. Such an oblique annular surface is easy to manufacture and enables the low-cost production of the fuel injection device according to the invention.

Besonders bevorzugt ist dabei, dass die schräge Ringfläche einen Winkel von ungefähr 120° einschließt. Bei einem solchen Winkel werden die für eine sichere Verbindung und Abdichtung erforderlichen axialen Kräfte noch gut übertragen, und andererseits bietet eine solche Schräge einen guten Sitz für die konvexe Kugelsegmentfläche.It is particularly preferred that the oblique annular surface forms an angle of approximately 120 °. At such an angle, the axial forces necessary for a secure connection and sealing are still well transferred, and on the other hand, such a slope provides a good fit for the convex spherical segment surface.

Besonders bevorzugt ist, wenn die Spanneinrichtung eine Ringscheibe umfasst, welche zwischen dem Einspritzgehäuse und der Spannmutter angeordnet ist, wobei entweder die konvexe Kugelsegmentfläche oder die schräge Ringfläche an der Ringscheibe ausgebildet ist. Eine derartige Ringscheibe ermöglicht beispielsweise die Verwendung einer üblichen Spannmutter, was die Herstellkosten der erfindungsgemäßen Kraftstoff-Einspritzvorrichtung niedrig hält. Alternativ kann aber auch das Einspritzgehäuse eine übliche Ringschulter aufweisen, an der also weder eine Schräge noch eine Kugelsegmentfläche vorhanden ist, wenn die erfindungsgemäße Ringscheibe vorgesehen wird.It is particularly preferred if the clamping device comprises an annular disc which is arranged between the injection housing and the clamping nut is, wherein either the convex spherical segment surface or the oblique annular surface is formed on the annular disc. Such an annular disk allows, for example, the use of a conventional clamping nut, which keeps the production costs of the fuel injection device according to the invention low. Alternatively, however, the injection housing may also have a conventional annular shoulder, on which neither a bevel nor a spherical segment surface is present when the annular disc according to the invention is provided.

Bevorzugt ist jedoch, wenn die konvexe Kugelsegmentfläche an der Ringschulter des Einspritzgehäuses ausgebildet ist. Beim Einspritzgehäuse handelt es sich ohnehin um ein relativ komplexes Teil, an dem der zusätzliche Bearbeitungsschritt einen vergleichsweise nur geringen Zusatzaufwand bedeutet.However, it is preferred if the convex spherical segment surface is formed on the annular shoulder of the injection housing. The injection housing is in any case a relatively complex part, at which the additional processing step means a comparatively little additional effort.

Das Ausrichten des Einspritzgehäuses gegenüber dem Basiskörper wird nochmals erleichtert, wenn die konvexe Kugelsegmentfläche und die mit dieser zusammenarbeitende schräge Ringfläche mit einer reibungsarmen Schicht, vorzugsweise Teflon, versehen sind.The alignment of the injection housing relative to the base body is further facilitated if the convex spherical segment surface and cooperating with this oblique annular surface with a low-friction layer, preferably Teflon, are provided.

Zeichnungdrawing

Nachfolgend werden Ausführungsbeispiele der Erfindung unter Bezugnahme auf die beiliegende Zeichnung im Detail erläutert. In der Zeichnung zeigen:

Fig. 1:
einen teilweisen Längsschnitt durch eine nicht erfindungsgemäße Kraftstoff- Einspritzvorrichtung mit einer Spannmutter und einer Ringscheibe;
Fig. 2:
einen Schnitt durch die Ringscheibe der Kraftstoff-Einspritzvorrichtung von Fig. 1;
Fig. 3:
eine Draufsicht auf die Spannmutter der Kraftstoff-Einspritzvorrichtung von Fig. 1;
Fig. 4:
einen teilweisen Längsschnitt bzw. eine Seitenansicht der Spannmutter der Kraftstoff- Einspritzvorrichtung von Fig. 1;
Fig. 5:
einen Schnitt längs der Linie V-V von Fig. 4;
Fig. 6:
eine Ansicht ähnlich Fig. 1 eines Ausführungsbeispiels einer erfindungsgemäßen Kraftstoff- Einspritzvorrichtung mit einer Spannmutter und einer Ringscheibe;
Fig. 7:
eine Draufsicht auf die Ringscheibe der Kraftstoff-Einspritzvorrichtung von Fig. 6;
Fig. 8:
einen Schnitt längs der Linie IX-IX von Fig. 7; und
Fig. 9:
einen Längsschnitt durch einen Bereich der Spannmutter der Kraftstoff-Einspritzvorrichtung von Fig. 6.
Hereinafter, embodiments of the invention will be explained in detail with reference to the accompanying drawings. In the drawing show:
Fig. 1:
a partial longitudinal section through a non-inventive fuel injection device with a clamping nut and an annular disc;
Fig. 2:
a section through the annular disc of the fuel injection device of Fig. 1 ;
3:
a plan view of the clamping nut of the fuel injection device of Fig. 1 ;
4:
a partial longitudinal section and a side view of the clamping nut of the fuel injection device of Fig. 1 ;
Fig. 5:
a section along the line VV of Fig. 4 ;
Fig. 6:
a view similar Fig. 1 an embodiment of a fuel injection device according to the invention with a clamping nut and an annular disc;
Fig. 7:
a plan view of the annular disc of the fuel injection device of Fig. 6 ;
Fig. 8:
a section along the line IX-IX of Fig. 7 ; and
Fig. 9:
a longitudinal section through a portion of the clamping nut of the fuel injection device of Fig. 6 ,

Beschreibung der AusführungsbeispieleDescription of the embodiments

In Fig. 1 trägt eine nicht erfindungsgemäße Kraftstoff-Einspritzvorrichtung insgesamt das Bezugszeichen 10. Sie unmfasst einen Basiskörper 12, ein Einspritzgehäuse 14 sowie eine Spannmutter 16. Am Basiskörper 12 ist ein Gewinde 18 vorhanden, mit dem die Spannmutter 16 verschraubt ist. Im Einspritzgehäuse 14 ist eine in dessen Längsrichtung verlaufende Ausnehmung 20 vorhanden, in der eine Ventilnadel 22 angeordnet ist. Ein Kraftstoff-Einlass 24 versorgt einen Ringraum 26 zwischen Ventilnadel 22 und Ausnehmung 20 mit Kraftstoff. Durch eine axiale Bewegung der Ventilnadel 22 können in der Figur nicht dargestellte Kraftstoff-Austrittsöffnungen mit dem Ringraum 26 verbunden werden, so dass von der Kraftstoff-Einspritzvorrichtung 10 Kraftstoff abgegeben wird.In Fig. 1 It carries a base body 12, an injection housing 14 and a clamping nut 16. On the base body 12, a thread 18 is present, with which the clamping nut 16 is screwed. In the injection housing 14 has a recess extending in its longitudinal direction 20 is provided, in which a valve needle 22 is arranged. A fuel inlet 24 supplies an annular space 26 between valve needle 22 and recess 20 with fuel. By an axial movement of the valve needle 22 not shown in the figure, fuel outlet openings can be connected to the annulus 26, so that 10 fuel is discharged from the fuel injection device.

Die Kraftstoff-Einspritzvorrichtung 10 dient im Allgemeinen zum Einspritzen von Kraftstoff direkt in den Brennraum einer Brennkraftmaschine. Mit ihr kann Benzin- oder Dieselkraftstoff eingespritzt werden.The fuel injector 10 generally serves to inject fuel directly into the combustion chamber of an internal combustion engine. With it gasoline or diesel fuel can be injected.

Bei der Spannmutter 16 (vgl. Fig. 3 - 5) handelt es sich um ein hohlzylindrisches Teil, welches einen Wandabschnitt 30 und einen an dessen in Fig. 1 unterem Ende angeformten radial nach innen weisenden Ringsteg 32 umfasst. Die in Fig. 1 obere Oberfläche 33 des Ringstegs 32 und die innere Oberfläche des Wandabschnitts 30 liegen in einem Winkel von ungefähr 90° zueinander.When the clamping nut 16 (see. Fig. 3-5 ) It is a hollow cylindrical part, which has a wall portion 30 and a in the in Fig. 1 lower end formed radially inwardly facing annular web 32 includes. In the Fig. 1 Upper surface 33 of the annular ridge 32 and the inner surface of the wall portion 30 are at an angle of approximately 90 ° to each other.

Das Einspritzgehäuse 14 weist einen Abschnitt 34 mit größerem und einen Abschnitt 36 mit kleinerem Durchmesser auf. Der Durchmesser des Abschnitts 36 mit kleinerem Durchmesser ist etwas kleiner als der Durchmesser der vom Ringsteg 32 der Spannmutter 16 begrenzten Öffnung 38. Der Durchmesser des Abschnitts 34 des Einspritzgehäuses 14 ist etwas kleiner als der Innendurchmesser des Wandabschnitts 30 der Spannmutter 16.The injection housing 14 has a larger diameter portion 34 and a smaller diameter portion 36. The diameter of the smaller-diameter portion 36 is slightly smaller than the diameter of the opening 38 bounded by the annular land 32 of the tightening nut 16. The diameter of the portion 34 of the injection housing 14 is slightly smaller than the inner diameter of the wall portion 30 of the tightening nut 16.

Zwischen dem Abschnitt 34 und dem Abschnitt 36 des Einspritzgehäuses 14 ist eine Ringschulter 40 gebildet. Die Ringschulter 40 ist in der Art einer Kugelsegmentfläche 41 konvex gekrümmt. Der Mittelpunkt M der Kugelsegmentfläche 41 liegt auf der Längsachse 42 der Kraftstoff-Einspritzvorrichtung 10. Der Radius der Kugel, aus welcher die Kugelsegmentfläche 41 ausgeschnitten ist, beträgt R.Between the portion 34 and the portion 36 of the injection housing 14, an annular shoulder 40 is formed. The annular shoulder 40 is convexly curved in the manner of a spherical segment surface 41. The center M of the spherical segment surface 41 lies on the longitudinal axis 42 of the fuel injector 10. The radius of the sphere from which the spherical segment surface 41 is cut out is R.

Zwischen dem Ringsteg 32 der Spannmutter 16 und der Ringschulter 40 am Einspritzgehäuse 14 ist eine Ringscheibe 44 vorhanden (vgl. Fig. 2). Der Innendurchmesser der Ringscheibe 44 ist etwas größer als der Außendurchmesser des Abschnitts 36 des Einspritzgehäuses 14, wohingegen der Außendurchmesser der Ringscheibe 44 etwas kleiner ist als der Innendurchmesser des Wandabschnitts 30 der Spannmutter 16. Die Oberseite 45 der Ringscheibe 44 ist als konkave Kugelsegmentfläche 46 ausgebildet, welche zu der konvexen Kugelsegmentfläche 41 am Einspritzgehäuse 14 komplementär ist. Die Unterseite der Ringscheibe 44 weist eine konische Einsenkung auf.Between the annular web 32 of the clamping nut 16 and the annular shoulder 40 on the injection housing 14, an annular disc 44 is present (see. Fig. 2 ). The inner diameter of the annular disc 44 is slightly larger than the outer diameter of the portion 36 of the injection housing 14, whereas the outer diameter of the annular disc 44 is slightly smaller than the inner diameter of the wall portion 30 of the clamping nut 16. The top 45 of the annular disc 44 is concave Ball segment surface 46 is formed, which is complementary to the convex spherical segment surface 41 on the injection housing 14. The underside of the annular disc 44 has a conical depression.

Der Radius der Kugel, aus welcher die konkave Kugelsegmentfläche 46 ausgeschnitten ist, beträgt somit ebenfalls R, und der Mittelpunkt M dieser Kugel liegt ebenfalls auf der Längsachse 42 der Kraftstoff-Einspritzvorrichtung 10. Beide Kugelsegmentflächen 41 und 46 sind mit einer reibungsarmen Teflonschicht (nicht sichtbar) versehen. Die Kugelsegmentflächen 41 und 46 arbeiten somit in der Art eines Kugelpfannen-Kugelkopf-Gelenks zusammen. Die Spannmutter 16 mit dem Ringsteg 32, die Ringschulter 40 am Einspritzgehäuse 14 und die Ringscheibe 44 bilden insgesamt eine Spanneinrichtung 48.The radius of the ball from which the concave spherical segment surface 46 is cut is thus also R, and the center M of this ball is also located on the longitudinal axis 42 of the fuel injector 10. Both spherical segment surfaces 41 and 46 are coated with a low-friction Teflon layer (not visible) ) Mistake. The ball segment surfaces 41 and 46 thus cooperate in the manner of a ball socket ball joint. The clamping nut 16 with the annular web 32, the annular shoulder 40 on the injection housing 14 and the annular disc 44 together form a clamping device 48th

Die Montage der Kraftstoff-Einspritzvorrichtung 10 mittels der Spanneinrichtung 48 geht folgendermaßen vor sich:The assembly of the fuel injection device 10 by means of the tensioning device 48 proceeds as follows:

Zunächst wird die Ringscheibe 44 von unten über den Abschnitt 36 des Einspritzgehäuses 14 übergeschoben. Dabei weist die konkave Kugelsegmentfläche 46 der Ringscheibe 44 nach oben, also auf die Ringschulter 40 des Einspritzgehäuses 14 zu. Dann wird die Spannmutter 16 über das Einspritzgehäuse 14 übergeschoben, wobei der Ringsteg 32 unten angeordnet ist. Die Spannmutter 16 wird nun mit dem Gewinde 18 am Basiskörper 12 verschraubt.First, the annular disc 44 is pushed over from below over the portion 36 of the injection housing 14. In this case, the concave spherical segment surface 46 of the annular disc 44 upwards, ie to the annular shoulder 40 of the injection housing 14 to. Then the clamping nut 16 is pushed over the injection housing 14, wherein the annular web 32 is arranged below. The clamping nut 16 is now bolted to the thread 18 on the base body 12.

Dabei kommt ein in Fig. 1 von der Spannmutter 16 verdeckter Bereich des Einspritzgehäuses 14 an einen in Fig. 1 ebenfalls verdeckten Bereich des Basiskörpers 12 in Anlage. Gegebenenfalls kann zwischen beiden Teilen auch ein Dichtelement, beispielsweise ein O-Ring, vorhanden sein. Beim Festziehen der Spannmutter 16 am Basiskörper 12 richtet sich das Einspritzgehäuse 14 gegenüber dem Basiskörper 12 so aus, dass die Flächenpressung an der Dichtfläche zwischen Einspritzgehäuse 14 und Basiskörper 12 ungefähr gleichmäßig ist.It comes in a Fig. 1 covered by the clamping nut 16 area of the injection housing 14 to a in Fig. 1 also hidden area of the base body 12 in Appendix. Optionally, a sealing element, such as an O-ring, may be present between the two parts. When tightening the clamping nut 16 on the base body 12, the injection housing 14 is oriented relative to the base body 12 so that the surface pressure at the sealing surface between the injection housing 14 and base body 12 is approximately uniform.

Dies ist dadurch möglich, dass die Kugelsegmentfläche 46 einerseits und die Kugelsegmentfläche 41 andererseits in der Art eines Kugelpfannen-Kugelkopf-Gelenks zusammenarbeiten und somit die axiale Ausrichtung der Spannmutter 16 und des Einspritzgehäuses 14 voneinander entkoppelt ist. Planlauftoleranzen am Gewinde 18 des Basiskörpers 12 sowie an dem in Fig. 1 nicht sichtbaren Innengewinde der Spannmutter 16 haben somit keine Auswirkungen mehr auf die Ausrichtung des Einspritzgehäuses 14.This is possible because the ball segment surface 46 on the one hand and the ball segment surface 41 on the other hand cooperate in the manner of a ball socket ball joint and thus the axial alignment of the clamping nut 16 and the injection housing 14 is decoupled from each other. Taper tolerances on the thread 18 of the base body 12 and on in the Fig. 1 invisible internal thread of the clamping nut 16 thus have no effect on the orientation of the injection housing 14th

Nun wird auf ein Ausführungsbeispiel einer erfindungsgemäßen Kraftstoff-Einspritzvorrichtung Bezug genommen, welches in den Fig. 6 - 9 dargestellt ist. Dabei tragen solche Teile und Elemente, welche äquivalente Funktionen zu der in den Fig. 1 - 5 dargestellten Kraftstoff-Einspritzvorrichtung aufweisen, die gleichen Bezugszeichen und sind nicht nochmals im Detail erläutert.Reference will now be made to an embodiment of a fuel injection device according to the invention, which in the Fig. 6-9 is shown. It bear such parts and elements, which equivalent functions to those in the Fig. 1-5 have shown fuel injection device, the same reference numerals and are not explained again in detail.

Im Unterschied zu der in den Fig. 1 - 5 dargestellten Kraftstoff-Einspritzvorrichtung 10 ist die in Fig. 6 nach oben weisende Oberfläche des Ringstegs 32 der Spannmutter 16 als schräge Ringfläche 50 ausgebildet. Die schräge Ringfläche 50 schließt dabei einen Winkel von ungefähr 120° ein (vgl. Fig. 9). Die Ringschulter 40 des Einspritzgehäuses 14 ist in dem vorliegenden Ausführungsbeispiel nicht konvex gekrümmt, sondern erstreckt sich vom Abschnitt 36 mit kleinerem Durchmesser des Einspritzgehäuses 14 geradlinig und in einem Winkel von ungefähr 90° radial nach außen. Die Ringscheibe 44 wiederum weist auf ihrer Unterseite eine Ringfläche auf, die in der Art einer Kugelsegmentfläche 41 konvex gekrümmt ist. Die Oberseite 45 der Ringscheibe 44 weist eine Einsenkung auf.Unlike in the Fig. 1-5 shown fuel injection device 10 is the in Fig. 6 upwardly facing surface of the annular web 32 of the clamping nut 16 is formed as an inclined annular surface 50. The oblique annular surface 50 encloses an angle of approximately 120 ° (cf. Fig. 9 ). The annular shoulder 40 of the injection housing 14 is not convexly curved in the present embodiment, but extends from the smaller diameter portion 36 of the injection housing 14 in a straight line and at an angle of approximately 90 ° radially outward. The annular disc 44 in turn has on its underside an annular surface which is convexly curved in the manner of a spherical segment surface 41. The top 45 of the annular disc 44 has a depression.

Bei dem in den Fig. 6 - 9 dargestellten Ausführungsbeispiel wird die Entkopplung der Ausrichtung der Spannmutter 16 einerseits und der Ausrichtung des Einspritzgehäuses 14 andererseits also durch die schräge Ringfläche 50 und die mit dieser zusammenarbeitenden konvexen Kugelsegmentfläche 41 erzielt.In the in the Fig. 6-9 illustrated embodiment, the decoupling of the orientation of the clamping nut 16 on the one hand and the orientation of the injection housing 14 on the other hand thus achieved by the oblique annular surface 50 and cooperating with this convex spherical segment surface 41.

Claims (5)

  1. Fuel injection device (10), in particular injector, for internal combustion engines, having a basic body (12), having an injection housing (14), having a clamping device (48), which comprises at least one clamping nut (16) with an annular web (32) and an annular shoulder (40) on the injection housing (14) and which clamps the injection housing (14) axially to the basic body (12), having a fuel inlet (24) and having at least one valve element (22), with the clamping device (48) having at least one annular surface which faces towards the annular web (32) of the clamping nut (16), which annular surface is convexly curved in the manner of a spherical segment surface (41) whose central point (M) is arranged on a longitudinal axis (42) of the fuel injection device (10), with the clamping device (48) having an oblique and planar annular surface (50) which faces towards the convex spherical segment surface (41) and against which the spherical segment surface (41) bears with linear contact.
  2. Fuel injection device (10) according to Claim 1, characterized in that the oblique annular surface (50) encloses an angle of approximately 120°.
  3. Fuel injection device (10) according to one of the preceding claims, characterized in that the clamping device (48) comprises an annular disc (44) which is arranged between the injection housing (14) and, the clamping nut (16), with either the convex spherical segment surface (41) or the oblique annular surface being formed on the annular disc (44).
  4. Fuel injection device (10) according to one of the preceding claims, characterized in that the convex spherical segment surface (41) is formed on the annular shoulder (40) of the injection housing (14).
  5. Fuel injection device (10) according to one of the preceding claims, characterized in that the convex spherical segment surface (41) and the oblique annular surface (50) which interacts therewith are provided with a low-friction layer, preferably composed of Teflon.
EP02726070.2A 2001-03-28 2002-03-22 Fuel injection device, especially injector, for internal combustion engines Expired - Lifetime EP1373713B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10115352 2001-03-28
DE10115325A DE10115325A1 (en) 2001-03-28 2001-03-28 Fuel injector, for an IC motor, has a clamp system to hold the injector housing at the base body, with a convex curvature in a ball segment shape at the clamping surface for an increased sealing action
PCT/DE2002/001040 WO2002077443A1 (en) 2001-03-28 2002-03-22 Fuel injection device, especially injector, for internal combustion engines

Publications (3)

Publication Number Publication Date
EP1373713A1 EP1373713A1 (en) 2004-01-02
EP1373713B1 EP1373713B1 (en) 2009-07-01
EP1373713B2 true EP1373713B2 (en) 2013-07-03

Family

ID=7679408

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02726070.2A Expired - Lifetime EP1373713B2 (en) 2001-03-28 2002-03-22 Fuel injection device, especially injector, for internal combustion engines

Country Status (5)

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US (1) US6994280B2 (en)
EP (1) EP1373713B2 (en)
JP (1) JP4210522B2 (en)
DE (2) DE10115325A1 (en)
WO (1) WO2002077443A1 (en)

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JP2002242796A (en) * 2001-02-14 2002-08-28 Denso Corp Fuel injection nozzle
DE10149514A1 (en) * 2001-10-08 2003-04-24 Bosch Gmbh Robert Fuel injector for IC engine fuel injection system, has deformable compensation sleeve for compensation of skew between coupled components
GB0603056D0 (en) * 2006-02-15 2006-03-29 Delphi Tech Inc Fuel injector
JP2008232120A (en) * 2007-03-23 2008-10-02 Denso Corp Fuel injection valve
DE102012217991A1 (en) * 2012-10-02 2014-04-03 Continental Automotive Gmbh Nozzle assembly for a fluid injector and fluid injector
DE102021104408A1 (en) * 2021-02-24 2022-08-25 Robert Bosch Gesellschaft mit beschränkter Haftung Combustion chamber seal for a fuel injector and internal combustion engine

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DE490743C (en) † 1927-09-13 1930-01-31 Ove Petersen Fuel injection valve for airless injection in internal combustion engines
GB669110A (en) † 1948-06-04 1952-03-26 Burmeister & Wains Mot Mask Improvements in or relating to fuel injection nozzles for internal combustion engines
CH296118A (en) † 1951-10-13 1954-01-31 Saurer Ag Adolph Injection nozzle for internal combustion engines.
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Also Published As

Publication number Publication date
US6994280B2 (en) 2006-02-07
DE10115325A1 (en) 2002-10-17
JP2004518888A (en) 2004-06-24
DE50213647D1 (en) 2009-08-13
US20030173427A1 (en) 2003-09-18
EP1373713A1 (en) 2004-01-02
WO2002077443A1 (en) 2002-10-03
JP4210522B2 (en) 2009-01-21
EP1373713B1 (en) 2009-07-01

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