EP1245826A2 - Sealing for a high-pressure fuel system of an internal combustion engine - Google Patents

Sealing for a high-pressure fuel system of an internal combustion engine Download PDF

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Publication number
EP1245826A2
EP1245826A2 EP02004834A EP02004834A EP1245826A2 EP 1245826 A2 EP1245826 A2 EP 1245826A2 EP 02004834 A EP02004834 A EP 02004834A EP 02004834 A EP02004834 A EP 02004834A EP 1245826 A2 EP1245826 A2 EP 1245826A2
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EP
European Patent Office
Prior art keywords
pressure
fuel system
sealing film
pressure fuel
valve
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.)
Withdrawn
Application number
EP02004834A
Other languages
German (de)
French (fr)
Other versions
EP1245826A3 (en
Inventor
Michael Kurz
Kurt Frank
Juergen Hanneke
Marcus Haefele
Friedrich Boecking
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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 EP1245826A2 publication Critical patent/EP1245826A2/en
Publication of EP1245826A3 publication Critical patent/EP1245826A3/en
Withdrawn legal-status Critical Current

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    • 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
    • F02M55/00Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/004Joints; Sealings
    • F02M55/005Joints; Sealings for high pressure conduits, e.g. connected to pump outlet or to injector inlet
    • 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
    • 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
    • F02M2200/00Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/16Sealing of fuel injection apparatus not otherwise provided for

Definitions

  • the invention relates to a high-pressure fuel system for Internal combustion engines from, as it is from the published application DE 198 27 628 A1 is known.
  • a high pressure fuel system as in this document in the form of a Fuel injection valve is a valve holding body and a valve body in place by a tension nut be pressed together. Through the contact surface of the an inlet channel passes through both bodies, through which Fuel under high pressure to the injection ports of the Fuel injector arrives. To ensure the tightness of the inlet channel when passing through the contact surface of the two To ensure bodies are on one of the contact surfaces of the raised both body areas, in particular surround the passage of the inlet channel.
  • the clamping nut With the same tightening torque the clamping nut turns the surface pressure in this area increases so that there is better sealing of the inlet channel results.
  • the known high-pressure fuel system however, the disadvantage of that training such raised areas is relatively complex and therefore costly.
  • the high-pressure fuel system according to the invention with the characteristic In contrast, features of claim 1 the advantage that a between the two high pressure bodies Sealing film is arranged, the passage of the channel surrounded by the contact surface and so in a simple and inexpensive Way leads to a seal.
  • the sealing film can be designed so that they next to the inlet channel also further penetrations of channels and holes surrounds that are formed in the high-pressure fuel system are.
  • the sealing film can be manufactured separately and for example punched out of a corresponding plate be so that it is easy and inexpensive to manufacture.
  • the formation of the invention is particularly advantageous Sealing film on a fuel injector where the sealing film between a high-pressure body Valve holding body and a high-pressure body Valve body is arranged.
  • the sealing film is made of a metal.
  • This metal is preferably soft compared to steel, from which the two high pressure bodies are made.
  • Copper or soft iron has been found to be an advantageous material the sealing film proved.
  • the sealing film preferably has a thickness in the range of a few ⁇ m up to a few hundred ⁇ m. This can the sealing effect and the flow properties of the sealing film optimal when bracing the two high pressure bodies against each other be matched to the desired tightness.
  • FIG. 1 shows an exemplary embodiment of a High-pressure fuel system shown in longitudinal section.
  • the high pressure fuel system here is a fuel injection valve, which has a housing that has two high pressure bodies, a valve holding body 1 and a valve body 10 includes.
  • the valve body 10 is by means of a clamping nut 12 axially clamped against the valve holding body 1, see above that the two bodies 1.10 touch in a sealing surface 14.
  • a bore 8 is formed in the valve body 10, in which a piston-shaped valve needle 16 is longitudinally displaceable is arranged.
  • the valve needle 16 faces its combustion chamber End a valve sealing surface 25 which with a trained at the end of the bore 8 facing the combustion chamber Valve seat 23 cooperates and so on their longitudinal movement controls the opening of at least one injection opening 27, which is formed on the valve seat 23.
  • the valve needle 16 has a pressure shoulder 13 which faces the combustion chamber is directed and which is surrounded by a pressure chamber 11, by a radial expansion of the bore 8 in the valve body 10 is formed.
  • the pressure chamber 11 is one formed in the valve body 10 and in the valve holding body 1 Inlet channel 20 with one not shown in the drawing High pressure fuel source connected so that the pressure chamber 11 be filled with fuel under high pressure can.
  • valve needle 16 goes in a pressure pin 7, which in a in the valve holding body 1 designed spring chamber 3 coaxial to the valve needle 16 is arranged to be longitudinally displaceable.
  • spring chamber 3 arranged to generate a closing force on the valve needle 16, which are here in the form of a closing spring 5, which between the pressure pin 7 and the combustion chamber facing away End of the spring chamber 3 arranged under pressure is, so that the valve needle 16 by the closing spring 5 in Closing direction is applied.
  • valve piston 18 Goes away from the combustion chamber the pressure pin 7 in a valve piston 18, which in a piston bore 17 formed in valve holding body 1 is arranged to be longitudinally displaceable and by means of a the drawing, not shown, a closing force can be exerted on the valve needle 16.
  • a closing force can be exerted on the valve needle 16.
  • This closing force is caused by the valve needle 16 Pressure in the pressure chamber 11 and the associated hydraulic Force on the pressure shoulder 13 in the opening direction, i.e. from Combustion chamber away, moved or by the closing force of the valve piston 18 with the valve sealing surface 25 on the valve seat 23 pressed so that the injection openings there 27th be closed.
  • the valve holding body 1 designed as a high-pressure body lies with a contact surface 101 on the valve body 10 trained contact surface 110.
  • Figure 2 shows the area the contact surfaces of valve holding body 1 and valve body 10 in an exploded view.
  • a sealing film 35 is arranged, so is designed so that it the passages of the inlet channel 20th and centering pin bores 32 through the sealing surface 14 surrounds.
  • In the centering pin bores 32 are centering pins 30 arranged, both in the valve holding body 1 and also protrude into the valve body 10 and thus a precise alignment enable the two high pressure bodies against each other.
  • FIG. 2 shows a possible embodiment of the sealing film 35 shown.
  • the sealing film 35 comprises in that shown here Embodiment in which in the valve body 10 in addition the inlet channel 20 and the bore 8 two centering pin bores 32 are formed, three ring-shaped areas, the inlet channel 20 and the two center pin holes 32 surrounded and the one another by connecting webs 36 are connected.
  • figure 3 is an enlargement of FIG. 1 in the area of the contact surfaces, here the sealing film 35 for the sake of clarity is shown thickened. You can see that the sealing film 35 both the passage of the inlet channel 20 and the Passage of the centering pin holes 32 surrounds without in the to protrude into each passage.
  • FIG 4 is another embodiment of an inventive Sealing film 35 shown.
  • the one shown here Valve body 10 has only one centering pin bore 32 and next to it only the bore 8 and the inlet channel 20. Since here the inlet channel 20 and the centering pin bore 32 have the same diameter and each other with respect to the Opposite the center of the circular contact surface 110, can the sealing film 35 designed mirror-symmetrical be so that when assembling the fuel injector not be installed in the wrong way can.
  • the contact surface 110 of the valve body 10 is one Recess 37 formed, in which the sealing film 35 is inserted is.
  • the recess 37 is formed such that the sealing film 35 is not laterally on the contact surface 110 can slip.
  • the recess 37 is not so deep that the sealing film 35 is completely immersed in it so that it is raised relative to the contact surface 110.
  • the fuel injection valve comes into contact surface 101 of the valve holding body 1 on the sealing film 35 for contact and not on the contact surface 110.
  • the sealing film 35 can be made from various materials his. For example, Steel which is a larger or may have a lower hardness than the steel from which the high pressure bodies are made. Furthermore, it can be provided, the sealing film 35 from a compared to Steel to produce soft metal, for example from copper or soft iron. Such a soft metal allows that the material flows when the clamping nut is tightened, so that minor bumps on the contact surfaces or dirt particles do not affect the tightness.
  • the thickness of the Sealing film 35 can meet the corresponding requirements of Fuel injector or other high pressure fuel system be adjusted. It can only be a few ⁇ m or a few tenths of a millimeter, preferably the sealing film 35 has a thickness of 5 to 500 microns.
  • the hardness of the material and the tightening torque of the nut is more or less strong flow of the sealing film 35 between the two High pressure bodies. Care must be taken here that the material of the sealing film 35 is not in the inlet channel 20 flows in and there to a narrowing of the flow cross section leads. In addition, it can also be provided that To produce sealing film 35 from a plastic, the Fuel is not dissolved and its softness ensures a good seal with low contact pressure.
  • Sealing film 35 can also be provided, depending on the number the passage of channels or holes through the contact surfaces the high pressure body of the sealing film 35 other shapes to give. However, it must always be ensured that the Sealing film 35 the channels in the area of the passage in the form of an annular disk surrounds, so that there is always a good seal results.
  • Example of a high pressure fuel system in the form of a Fuel injection valve can be a sealing film according to the invention also provided in other high-pressure fuel systems be in which the passage of a high-pressure fuel channel sealed by the contact surfaces of two high pressure bodies shall be. Examples of such high pressure fuel systems are high-pressure fuel pumps, line seals or pump-nozzle units and any connections of high pressure lines on high pressure bodies.
  • the sealing film 35 is not a separate one To produce a part, but as a molding directly onto a Apply contact surface of a high pressure body. This can happen, for example, that a corresponding Layer electrolytically, galvanically or with a phototechnical Process is applied to the contact surface, so that the passages of the high pressure channels and the other holes are surrounded by a raised surface.

Abstract

The high pressure fuel system has two high pressure components (1,10) bearing one upon the other by contact surfaces (101,110) with a feed channel (20) formed in each component. A sealing foil (35) is installed between the two HP components and encompasses at least the passage of the HP fuel channel through the contact surfaces. The sealing foil consists of metal, and the HP components consist of metal, with the metal of the sealing foil softer than the steel of the HP components. The metal material may be copper or soft iron.

Description

Stand der TechnikState of the art

Die Erfindung geht von einem Kraftstoffhochdrucksystem für Brennkraftmaschinen aus, wie es aus der Offenlegungsschrift DE 198 27 628 A1 bekannt ist. Bei einem solchen Kraftstoffhochdrucksystem, wie es in dieser Schrift in Form eines Kraftstoffeinspritzventils vorliegt, ist ein Ventilhaltekörper und ein Ventilkörper vorhanden, die durch eine Spannmutter aneinandergepreßt werden. Durch die Anlagefläche der beiden Körper tritt ein Zulaufkanal hindurch, durch den Kraftstoff unter hohem Druck zu den Einspritzöffnungen des Kraftstoffeinspritzventils gelangt. Um die Dichtheit des Zulaufkanals beim Durchtritt durch die Anlagefläche der beiden Körper zu gewährleisten, sind an einer der Anlageflächen der beiden Körper erhabene Bereiche ausgebildet, die insbesondere den Durchtritt des Zulaufkanals umgeben. Bei gleichem Anzugsmoment der Spannmutter wird so die Flächenpressung in diesem Bereich erhöht, so daß sich eine bessere Abdichtung des Zulaufkanals ergibt. Hierbei weist das bekannte Kraftstoffhochdrucksystem jedoch den Nachteil auf, daß die Ausbildung solcher erhabener Bereiche relativ aufwendig ist und damit kostenintensiv. Darüber hinaus sind die beiden Körper aus einem harten Stahl gefertigt, der sich beim Anpressen durch die Spannmutter nicht plastisch verformt, so daß an die Oberflächengüte der erhabenen Bereiche hohe Anforderungen gestellt werden müssen, um eine gute Dichtung zu erreichen.The invention relates to a high-pressure fuel system for Internal combustion engines from, as it is from the published application DE 198 27 628 A1 is known. With such a high pressure fuel system, as in this document in the form of a Fuel injection valve is a valve holding body and a valve body in place by a tension nut be pressed together. Through the contact surface of the an inlet channel passes through both bodies, through which Fuel under high pressure to the injection ports of the Fuel injector arrives. To ensure the tightness of the inlet channel when passing through the contact surface of the two To ensure bodies are on one of the contact surfaces of the raised both body areas, in particular surround the passage of the inlet channel. With the same tightening torque the clamping nut turns the surface pressure in this area increases so that there is better sealing of the inlet channel results. Here, the known high-pressure fuel system however, the disadvantage of that training such raised areas is relatively complex and therefore costly. In addition, the two bodies made of a hard steel, which is when pressed not plastically deformed by the clamping nut, so that at the surface quality of the raised areas makes high demands must be put in order to achieve a good seal.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Kraftstoffhochdrucksystem mit den kennzeichnenden Merkmalen des Patentanspruchs 1 hat demgegenüber den Vorteil, daß zwischen den beiden Hochdruckkörpern eine Dichtfolie angeordnet ist, die den Durchtritt des Kanals durch die Anlagefläche umgibt und so in einfacher und kostengünstiger Weise zu einer Abdichtung führt. Die Dichtfolie kann dabei so ausgebildet sein, daß sie neben dem Zulaufkanal auch noch weitere Durchtritte von Kanälen und Bohrungen umgibt, die im Kraftstoffhochdrucksystem ausgebildet sind. Die Dichtfolie kann separat gefertigt werden und beispielsweise aus einer entsprechenden Platte ausgestanzt sein, so daß sie einfach und kostengünstig herzustellen ist.The high-pressure fuel system according to the invention with the characteristic In contrast, features of claim 1 the advantage that a between the two high pressure bodies Sealing film is arranged, the passage of the channel surrounded by the contact surface and so in a simple and inexpensive Way leads to a seal. The sealing film can be designed so that they next to the inlet channel also further penetrations of channels and holes surrounds that are formed in the high-pressure fuel system are. The sealing film can be manufactured separately and for example punched out of a corresponding plate be so that it is easy and inexpensive to manufacture.

Besonders vorteilhaft ist die Ausbildung der erfindungsgemäßen Dichtfolie an einem Kraftstoffeinspritzventil, bei dem die Dichtfolie zwischen einem als Hochdruckkörper ausgebildeten Ventilhaltekörper und einem als Hochdruckkörper ausgebildeten Ventilkörper angeordnet ist. Insbesondere bei Einspritzsystemen, die mit einem konstant anliegenden Druck im Ventilkörper arbeiten, sogenannten Common Rail-Systemen, kann so mit einfachen Mitteln eine gute Dichtheit des Zulaufkanals, der im Ventilhaltekörper durch die Dichtfläche hindurch zum Ventilkörper hin verläuft, erreicht werden.The formation of the invention is particularly advantageous Sealing film on a fuel injector where the sealing film between a high-pressure body Valve holding body and a high-pressure body Valve body is arranged. Especially with injection systems, with a constant pressure in the Valve bodies work, so-called common rail systems, can easily seal the inlet duct with simple means, that in the valve holding body through the sealing surface runs through to the valve body can be reached.

In einer vorteilhaften Ausgestaltung des Gegenstandes der Erfindung ist die Dichtfolie aus einem Metall ausgebildet. Dieses Metall ist vorzugsweise weich im Vergleich zum Stahl, aus dem die beiden Hochdruckkörper gefertigt sind. Als besonders vorteilhaft hat sich Kupfer oder Weicheisen als Material der Dichtfolie erwiesen.In an advantageous embodiment of the subject of Invention, the sealing film is made of a metal. This metal is preferably soft compared to steel, from which the two high pressure bodies are made. As special Copper or soft iron has been found to be an advantageous material the sealing film proved.

Die Dichtfolie weist vorzugsweise eine Dicke im Bereich von wenigen µm bis zu einigen hundert µm auf. Hierdurch können die Dichtwirkung und die Fließeigenschaften der Dichtfolie beim Verspannen der beiden Hochdruckkörper gegeneinander optimal auf die gewünschte Dichtheit abgestimmt werden.The sealing film preferably has a thickness in the range of a few µm up to a few hundred µm. This can the sealing effect and the flow properties of the sealing film optimal when bracing the two high pressure bodies against each other be matched to the desired tightness.

Weitere Vorteile und vorteilhafte Ausgestaltungen des Gegenstandes der Erfindung sind der Zeichnung, der Beschreibung und den Ansprüchen entnehmbar.Further advantages and advantageous configurations of the object the invention are the drawing, the description and removable from the claims.

Zeichnungdrawing

In der Zeichnung ist ein Ausführungsbeispiel des erfindungsgemäßen Kraftstoffhochdrucksystems dargestellt. Es zeigt

  • Figur 1 ein Kraftstoffhochdrucksystem in Form eines Kraftstoffeinspritzventils im Längsschnitt,
  • Figur 2 eine Vergrößerung im Bereich der Dichtfläche zwischen Ventilhaltekörper und Ventilkörper in einer Explosionsdarstellung,
  • Figur 3 eine Vergrößerung von Figur 1 im Bereich der Dichtfolie und
  • Figur 4 eine Draufsicht der Anlagefläche des Ventilkörpers mit darin eingelegter Dichtfolie.
In the drawing, an embodiment of the high-pressure fuel system according to the invention is shown. It shows
  • FIG. 1 shows a high-pressure fuel system in the form of a fuel injection valve in longitudinal section,
  • FIG. 2 shows an enlargement in the area of the sealing surface between the valve holding body and the valve body in an exploded view,
  • Figure 3 is an enlargement of Figure 1 in the area of the sealing film and
  • Figure 4 is a plan view of the contact surface of the valve body with the sealing film inserted therein.

Beschreibung des AusführungsbeispielsDescription of the embodiment

In Figur 1 ist ein erfindungsgemäßes Ausführungsbeispiel eines Kraftstoffhochdrucksystems im Längsschnitt dargestellt. Das Kraftstoffhochdrucksystem ist hier ein Kraftstoffeinspritzventil, das ein Gehäuse aufweist, das zwei Hochdruckkörper, einen Ventilhaltekörper 1 und einen Ventilkörper 10 umfaßt. Hierbei ist der Ventilkörper 10 mittels einer Spannmutter 12 gegen den Ventilhaltekörper 1 axial verspannt, so daß sich die beiden Körper 1,10 in einer Dichtfläche 14 berühren. Im Ventilkörper 10 ist eine Bohrung 8 ausgebildet, in der eine kolbenförmige Ventilnadel 16 längsverschiebbar angeordnet ist. Die Ventilnadel 16 weist an ihrem brennraumzugewandten Ende eine Ventildichtfläche 25 auf, die mit einem am brennraumzugewandten Ende der Bohrung 8 ausgebildeten Ventilsitz 23 zusammenwirkt und so über ihre Längsbewegung die Öffnung wenigstens einer Einspritzöffnung 27 steuert, die am Ventilsitz 23 ausgebildet ist. Die Ventilnadel 16 weist eine Druckschulter 13 auf, die auf den Brennraum zu gerichtet ist und die von einem Druckraum 11 umgeben ist, der durch eine radiale Erweiterung der Bohrung 8 im Ventilkörper 10 ausgebildet ist. Der Druckraum 11 ist über einen im Ventilkörper 10 und im Ventilhaltekörper 1 ausgebildeten Zulaufkanal 20 mit einer in der Zeichnung nicht dargestellten Kraftstoffhochdruckquelle verbunden, so daß der Druckraum 11 mit Kraftstoff unter hohem Druck befüllt werden kann.FIG. 1 shows an exemplary embodiment of a High-pressure fuel system shown in longitudinal section. The high pressure fuel system here is a fuel injection valve, which has a housing that has two high pressure bodies, a valve holding body 1 and a valve body 10 includes. Here, the valve body 10 is by means of a clamping nut 12 axially clamped against the valve holding body 1, see above that the two bodies 1.10 touch in a sealing surface 14. A bore 8 is formed in the valve body 10, in which a piston-shaped valve needle 16 is longitudinally displaceable is arranged. The valve needle 16 faces its combustion chamber End a valve sealing surface 25 which with a trained at the end of the bore 8 facing the combustion chamber Valve seat 23 cooperates and so on their longitudinal movement controls the opening of at least one injection opening 27, which is formed on the valve seat 23. The valve needle 16 has a pressure shoulder 13 which faces the combustion chamber is directed and which is surrounded by a pressure chamber 11, by a radial expansion of the bore 8 in the valve body 10 is formed. The pressure chamber 11 is one formed in the valve body 10 and in the valve holding body 1 Inlet channel 20 with one not shown in the drawing High pressure fuel source connected so that the pressure chamber 11 be filled with fuel under high pressure can.

An ihrem brennraumabgewandten Ende geht die Ventilnadel 16 in einen Druckbolzen 7 über, der in einem im Ventilhaltekörper 1 ausgebildeten Federraum 3 koaxial zur Ventilnadel 16 längsverschiebbar angeordnet ist. Im Federraum 3 sind Mittel zur Erzeugung einer Schließkraft auf die Ventilnadel 16 angeordnet, die hier in Form einer Schließfeder 5 vorliegen, welche zwischen dem Druckbolzen 7 und dem brennraumabgewandten Ende des Federraums 3 unter Druckvorspannung angeordnet ist, so daß die Ventilnadel 16 durch die Schließfeder 5 in Schließrichtung beaufschlagt ist. Brennraumabgewandt geht der Druckbolzen 7 in einen Ventilkolben 18 über, der in einer im Ventilhaltekörper 1 ausgebildeten Kolbenbohrung 17 längsverschiebbar angeordnet ist und über den durch eine in der Zeichnung nicht dargestellte Vorrichtung eine Schließkraft auf die Ventilnadel 16 ausgeübt werden kann. Je nach Größe dieser Schließkraft wird die Ventilnadel 16 durch den Druck im Druckraum 11 und die damit verbundene hydraulische Kraft auf die Druckschulter 13 in Öffnungsrichtung, d.h. vom Brennraum weg, bewegt oder durch die Schließkraft des Ventilkolbens 18 mit der Ventildichtfläche 25 auf den Ventilsitz 23 gepreßt, so daß die dortigen Einspritzöffnungen 27 verschlossen werden.At its end remote from the combustion chamber, the valve needle 16 goes in a pressure pin 7, which in a in the valve holding body 1 designed spring chamber 3 coaxial to the valve needle 16 is arranged to be longitudinally displaceable. There are means in the spring chamber 3 arranged to generate a closing force on the valve needle 16, which are here in the form of a closing spring 5, which between the pressure pin 7 and the combustion chamber facing away End of the spring chamber 3 arranged under pressure is, so that the valve needle 16 by the closing spring 5 in Closing direction is applied. Goes away from the combustion chamber the pressure pin 7 in a valve piston 18, which in a piston bore 17 formed in valve holding body 1 is arranged to be longitudinally displaceable and by means of a the drawing, not shown, a closing force can be exerted on the valve needle 16. Depending on The size of this closing force is caused by the valve needle 16 Pressure in the pressure chamber 11 and the associated hydraulic Force on the pressure shoulder 13 in the opening direction, i.e. from Combustion chamber away, moved or by the closing force of the valve piston 18 with the valve sealing surface 25 on the valve seat 23 pressed so that the injection openings there 27th be closed.

Der als Hochdruckkörper ausgebildete Ventilhaltekörper 1 liegt mit einer Anlagefläche 101 an der am Ventilkörper 10 ausgebildeten Anlagefläche 110 an. Figur 2 zeigt den Bereich der Anlageflächen von Ventilhaltekörper 1 und Ventilkörper 10 in einer Explosionsdarstellung. Zwischen den Anlageflächen 101 und 110 ist eine Dichtfolie 35 angeordnet, die so ausgebildet ist, daß sie die Durchtritte des Zulaufkanals 20 und von Zentrierstiftbohrungen 32 durch die Dichtfläche 14 umgibt. In den Zentrierstiftbohrungen 32 sind Zentrierstifte 30 angeordnet, die sowohl in den Ventilhaltekörper 1 als auch in den Ventilkörper 10 ragen und so eine präzise Ausrichtung der beiden Hochdruckkörper gegeneinander ermöglichen. In Figur 2 ist eine mögliche Ausgestaltung der Dichtfolie 35 gezeigt. Die Dichtfolie 35 umfaßt in dem hier gezeigten Ausführungsbeispiel, bei dem im Ventilkörper 10 neben dem Zulaufkanal 20 und der Bohrung 8 zwei Zentrierstiftbohrungen 32 ausgebildet sind, drei ringscheibenförmige Bereiche, die den Zulaufkanal 20 und die beiden Zentrierstiftbohrungen 32 umgeben und die untereinander durch Verbindungsstege 36 verbunden sind. Hierdurch erhält man eine zusammenhängende Dichtfolie 35, die sich bei bereits montierten Zentrierstiften 30 im Ventilkörper 10 einfach über diese positionieren läßt und so ohne eine weitere Justage alle Durchgänge durch die Anlageflächen 101 und 110 umgibt. Figur 3 ist eine Vergrößerung von Figur 1 im Bereich der Anlageflächen, wobei hier die Dichtfolie 35 der Deutlichkeit halber verdickt dargestellt ist. Man sieht, daß die Dichtfolie 35 sowohl den Durchtritt des Zulaufkanals 20 als auch den Durchtritt der Zentrierstiftbohrungen 32 umgibt, ohne in den jeweiligen Durchtritt hineinzuragen.The valve holding body 1 designed as a high-pressure body lies with a contact surface 101 on the valve body 10 trained contact surface 110. Figure 2 shows the area the contact surfaces of valve holding body 1 and valve body 10 in an exploded view. Between the contact surfaces 101 and 110 a sealing film 35 is arranged, so is designed so that it the passages of the inlet channel 20th and centering pin bores 32 through the sealing surface 14 surrounds. In the centering pin bores 32 are centering pins 30 arranged, both in the valve holding body 1 and also protrude into the valve body 10 and thus a precise alignment enable the two high pressure bodies against each other. FIG. 2 shows a possible embodiment of the sealing film 35 shown. The sealing film 35 comprises in that shown here Embodiment in which in the valve body 10 in addition the inlet channel 20 and the bore 8 two centering pin bores 32 are formed, three ring-shaped areas, the inlet channel 20 and the two center pin holes 32 surrounded and the one another by connecting webs 36 are connected. This gives you a coherent Sealing film 35, which are already installed Centering pins 30 in the valve body 10 simply over this can be positioned and so all without further adjustment Passages through the contact surfaces 101 and 110 surrounds. figure 3 is an enlargement of FIG. 1 in the area of the contact surfaces, here the sealing film 35 for the sake of clarity is shown thickened. You can see that the sealing film 35 both the passage of the inlet channel 20 and the Passage of the centering pin holes 32 surrounds without in the to protrude into each passage.

In Figur 4 ist ein weiteres Ausführungsbeispiel einer erfindungsgemäßen Dichtfolie 35 gezeigt. Es ist hier eine Draufsicht auf den Ventilkörper 10 gezeigt, wobei der hier gezeigte Ventilkörper 10 nur eine Zentrierstiftbohrung 32 aufweist und daneben nur die Bohrung 8 und den Zulaufkanal 20. Da hier der Zulaufkanal 20 und die Zentrierstiftbohrung 32 den gleichen Durchmesser haben und einander bezüglich des Mittelpunkts der kreisförmigen Anlagefläche 110 gegenüberliegen, kann die Dichtfolie 35 spiegelsymmetrisch gestaltet werden, so daß sie bei der Montage des Kraftstoffeinspritzventils nicht in falscher Art und Weise eingebaut werden kann. In der Anlagefläche 110 des Ventilkörpers 10 ist eine Vertiefung 37 ausgebildet, in die die Dichtfolie 35 eingelegt ist. Hierbei ist die Vertiefung 37 so ausgebildet, daß die Dichtfolie 35 nicht auf der Anlagefläche 110 seitlich verrutschen kann. Die Vertiefung 37 ist jedoch nicht so tief, daß die Dichtfolie 35 ganz darin eintaucht, so daß sie gegenüber der Anlagefläche 110 erhaben ist. Bei der Montage des Kraftstoffeinspritzventils kommt so die Anlagefläche 101 des Ventilhaltekörpers 1 an der Dichtfolie 35 zur Anlage und nicht an der Anlagefläche 110.In Figure 4 is another embodiment of an inventive Sealing film 35 shown. Here is a top view shown on the valve body 10, the one shown here Valve body 10 has only one centering pin bore 32 and next to it only the bore 8 and the inlet channel 20. Since here the inlet channel 20 and the centering pin bore 32 have the same diameter and each other with respect to the Opposite the center of the circular contact surface 110, can the sealing film 35 designed mirror-symmetrical be so that when assembling the fuel injector not be installed in the wrong way can. In the contact surface 110 of the valve body 10 is one Recess 37 formed, in which the sealing film 35 is inserted is. Here, the recess 37 is formed such that the sealing film 35 is not laterally on the contact surface 110 can slip. However, the recess 37 is not so deep that the sealing film 35 is completely immersed in it so that it is raised relative to the contact surface 110. During installation of the fuel injection valve comes into contact surface 101 of the valve holding body 1 on the sealing film 35 for contact and not on the contact surface 110.

Die Dichtfolie 35 kann aus verschiedenen Materialien gefertigt sein. In Frage kommen z.B. Stahl, der eine größere oder eine geringere Härte aufweisen kann als der Stahl, aus dem die Hochdruckkörper gefertigt sind. Darüber hinaus kann es vorgesehen sein, die Dichtfolie 35 aus einem im Vergleich zu Stahl weichen Metall herzustellen, beispielsweise aus Kupfer oder Weicheisen. Ein solch weiches Metall ermöglicht es, daß das Material fließt beim Anziehen der Spannmutter, so daß kleinere Unebenheiten an den Anlageflächen oder Schmutzpartikel die Dichtheit nicht beeinträchtigen. Die Dicke der Dichtfolie 35 kann den entsprechenden Anforderungen des Kraftstoffeinspritzventils oder des sonstigen Kraftstoffhochdrucksystems angepaßt werden. Sie kann nur wenige µm betragen oder auch einige Zehntel Millimeter, vorzugsweise weist die Dichtfolie 35 eine Dicke von 5 bis 500 µm auf. Je nach Dicke der Dichtfolie 35, der Härte des Materials und dem Anzugsmoment der Schraubenmutter ergibt sich mehr oder weniger starkes Fließen der Dichtfolie 35 zwischen den beiden Hochdruckkörpern. Hierbei muß darauf geachtet werden, daß das Material der Dichtfolie 35 nicht in den Zulaufkanal 20 einfließt und dort zu einer Verengung des Durchflußquerschnitts führt. Daneben kann es auch vorgesehen sein, die Dichtfolie 35 aus einem Kunststoff zu fertigen, der vom Kraftstoff nicht gelöst wird und der durch seine Weichheit eine gute Abdichtung bei geringer Anpreßkraft gewährleistet.The sealing film 35 can be made from various materials his. For example, Steel which is a larger or may have a lower hardness than the steel from which the high pressure bodies are made. Furthermore, it can be provided, the sealing film 35 from a compared to Steel to produce soft metal, for example from copper or soft iron. Such a soft metal allows that the material flows when the clamping nut is tightened, so that minor bumps on the contact surfaces or dirt particles do not affect the tightness. The thickness of the Sealing film 35 can meet the corresponding requirements of Fuel injector or other high pressure fuel system be adjusted. It can only be a few µm or a few tenths of a millimeter, preferably the sealing film 35 has a thickness of 5 to 500 microns. ever according to the thickness of the sealing film 35, the hardness of the material and the tightening torque of the nut is more or less strong flow of the sealing film 35 between the two High pressure bodies. Care must be taken here that the material of the sealing film 35 is not in the inlet channel 20 flows in and there to a narrowing of the flow cross section leads. In addition, it can also be provided that To produce sealing film 35 from a plastic, the Fuel is not dissolved and its softness ensures a good seal with low contact pressure.

Neben den in den Figuren 2, 3 und 4 gezeigten Formen der Dichtfolie 35 kann es auch vorgesehen sein, je nach Anzahl der Durchtritte von Kanälen oder Bohrungen durch die Anlageflächen der Hochdruckkörper der Dichtfolie 35 andere Formen zu geben. Hierbei ist jedoch stets darauf zu achten, daß die Dichtfolie 35 die Kanäle im Bereich des Durchtritts ringscheibenförmig umgibt, so daß sich dort stets eine gute Abdichtung ergibt. Neben dem in der Zeichnung dargestellten Beispiel eines Kraftstoffhochdrucksystems in Form eines Kraftstoffeinspritzventils kann eine erfindungsgemäße Dichtfolie auch in anderen Kraftstoffhochdrucksystemen vorgesehen sein, bei denen der Durchtritt eines Kraftstoffhochdruckkanals durch die Anlageflächen zweier Hochdruckkörper abgedichtet werden soll. Beispiele für solche Kraftstoffhochdrucksysteme sind Kraftstoffhochdruckpumpen, Leitungsdichtungen oder Pumpe-Düse-Einheiten und beliebige Anschlüsse von Hochdruckleitungen an Hochdruckkörpern. In addition to the forms shown in Figures 2, 3 and 4 Sealing film 35 can also be provided, depending on the number the passage of channels or holes through the contact surfaces the high pressure body of the sealing film 35 other shapes to give. However, it must always be ensured that the Sealing film 35 the channels in the area of the passage in the form of an annular disk surrounds, so that there is always a good seal results. In addition to that shown in the drawing Example of a high pressure fuel system in the form of a Fuel injection valve can be a sealing film according to the invention also provided in other high-pressure fuel systems be in which the passage of a high-pressure fuel channel sealed by the contact surfaces of two high pressure bodies shall be. Examples of such high pressure fuel systems are high-pressure fuel pumps, line seals or pump-nozzle units and any connections of high pressure lines on high pressure bodies.

Neben den in der Zeichnung dargestellten Dichtfolien 35 kann es auch vorgesehen sein, die Dichtfolie 35 nicht als separates Teil zu fertigen, sondern als Anformung direkt auf eine Anlagefläche eines Hochdruckkörpers aufzubringen. Dies kann beispielsweise dadurch geschehen, daß eine entsprechende Schicht elektrolytisch, galvanisch oder mit einem phototechnischen Verfahren auf die Anlagefläche aufgebracht wird, so daß die Durchtritte der hochdruckführenden Kanäle und der sonstigen Bohrungen von einer erhabenen Fläche umgeben sind.In addition to the sealing films 35 shown in the drawing it can also be provided that the sealing film 35 is not a separate one To produce a part, but as a molding directly onto a Apply contact surface of a high pressure body. This can happen, for example, that a corresponding Layer electrolytically, galvanically or with a phototechnical Process is applied to the contact surface, so that the passages of the high pressure channels and the other holes are surrounded by a raised surface.

Claims (14)

Kraftstoffhochdrucksystem für Brennkraftmaschinen mit einem Gehäuse, das zwei Hochdruckkörper (1; 10) umfaßt, die zumindest mittelbar mit Anlageflächen (101; 110) aneinander anliegen und durch eine Spannvorrichtung gegeneinander gepreßt werden, und mit einem in den Hochdruckkörpern (1; 10) ausgebildeten Zulaufkanal (20), der Kraftstoff unter hohem Druck führt und der durch die Anlageflächen (101; 110) der beiden Hochdruckkörper (1; 10) hindurchtritt, dadurch gekennzeichnet, daß zwischen den beiden Hochdruckkörpern (1; 10) eine Dichtfolie (35) angeordnet ist, die zumindest den Durchtritt des Hochdruckkanals (20) durch die Anlageflächen (101; 110) umgibt.High-pressure fuel system for internal combustion engines with a housing which comprises two high-pressure bodies (1; 10), which at least indirectly abut one another with contact surfaces (101; 110) and are pressed against one another by a tensioning device, and with an inlet channel formed in the high-pressure bodies (1; 10) (20) which carries fuel under high pressure and which passes through the contact surfaces (101; 110) of the two high-pressure bodies (1; 10), characterized in that a sealing film (35) is arranged between the two high-pressure bodies (1; 10) which at least surrounds the passage of the high-pressure duct (20) through the contact surfaces (101; 110). Kraftstoffhochdrucksystem nach Anspruch 1, dadurch gekennzeichnet, daß die Dichtfolie (35) aus Metall besteht.High-pressure fuel system according to claim 1, characterized in that the sealing film (35) consists of metal. Kraftstoffhochdrucksystem nach Anspruch 2, dadurch gekennzeichnet, daß die Hochdruckkörper (1; 10) aus Metall bestehen und daß das Metall der Dichtfolie (35) weicher als der Stahl der Hochdruckkörper (1; 10) ist.High-pressure fuel system according to Claim 2, characterized in that the high-pressure bodies (1; 10) consist of metal and that the metal of the sealing film (35) is softer than the steel of the high-pressure body (1; 10). Kraftstoffhochdrucksystem nach Anspruch 3, dadurch gekennzeichnet, daß das Metall Kupfer ist.High-pressure fuel system according to claim 3, characterized in that the metal is copper. Kraftstoffhochdrucksystem nach Anspruch 3, dadurch gekennzeichnet, daß das Metall Weicheisen ist.High-pressure fuel system according to claim 3, characterized in that the metal is soft iron. Kraftstoffhochdrucksystem nach Anspruch 1, dadurch gekennzeichnet, daß die Dichtfolie nur einen Teil der Anlageflächen (101; 110) der Hochdruckkörper (1;10) bedeckt. High-pressure fuel system according to Claim 1, characterized in that the sealing film covers only part of the contact surfaces (101; 110) of the high-pressure body (1; 10). Kraftstoffhochdrucksystem nach Anspruch 6, dadurch gekennzeichnet, daß die Dichtfolie (35) den Durchtritt des Hochdruckkanals (20) und gegebenenfalls weiterer Durchtritte ringscheibenförmig umgibt.High-pressure fuel system according to Claim 6, characterized in that the sealing film (35) surrounds the passage of the high-pressure duct (20) and, if appropriate, further passages in the form of an annular disk. Kraftstoffhochdrucksystem nach Anspruch 7, dadurch gekennzeichnet, daß die ringscheibenförmigen Bereiche der Dichtfolie (35) durch Verbindungsstege (36) miteinander verbunden sind.High-pressure fuel system according to claim 7, characterized in that the annular disk-shaped regions of the sealing film (35) are connected to one another by connecting webs (36). Kraftstoffhochdrucksystem nach Anspruch 1, dadurch gekennzeichnet, daß die Dichtfolie (35) in eine Vertiefung (37) eingelegt ist, die in einer der Anlageflächen (101; 110) ausgebildet ist.High-pressure fuel system according to Claim 1, characterized in that the sealing film (35) is inserted into a recess (37) which is formed in one of the contact surfaces (101; 110). Kraftstoffhochdrucksystem nach Anspruch 1, dadurch gekennzeichnet, daß die Dichtfolie (35) eine Dicke im Bereich von 5 bis 500 µm aufweist.High-pressure fuel system according to Claim 1, characterized in that the sealing film (35) has a thickness in the range from 5 to 500 µm. Kraftstoffhochdrucksystem nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die Dichtfolie (35) durch Anformung auf einer Anlagefläche (101; 110) eines Hochdruckkörpers (1; 10) ausgebildet ist.High-pressure fuel system according to one of the preceding claims, characterized in that the sealing film (35) is formed by molding on a contact surface (101; 110) of a high-pressure body (1; 10). Kraftstoffhochdrucksystem nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß das Kraftstoffhochdrucksystem ein Kraftstoffeinspritzventil ist.High-pressure fuel system according to one of the preceding claims, characterized in that the high-pressure fuel system is a fuel injection valve. Kraftstoffeinspritzventil nach Anspruch 12, dadurch gekennzeichnet, daß einer der Hochdruckkörper ein Ventilkörper (10) ist, in dem eine Ventilnadel (16) längsverschiebbar angeordnet ist.Fuel injection valve according to Claim 12, characterized in that one of the high pressure bodies is a valve body (10) in which a valve needle (16) is arranged to be longitudinally displaceable. Kraftstoffeinspritzventil nach Anspruch 13, dadurch gekennzeichnet, daß der andere Hochdruckkörper ein Ventilhaltekörper (1) ist, in dem Mittel vorhanden sind, die eine Schließkraft auf die Ventilnadel (16) ausüben.Fuel injection valve according to Claim 13, characterized in that the other high-pressure body is a valve holding body (1) in which there are means which exert a closing force on the valve needle (16).
EP02004834A 2001-03-28 2002-03-02 Sealing for a high-pressure fuel system of an internal combustion engine Withdrawn EP1245826A3 (en)

Applications Claiming Priority (2)

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DE10115214 2001-03-28
DE10115214A DE10115214A1 (en) 2001-03-28 2001-03-28 High-pressure fuel system for internal combustion engines

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Also Published As

Publication number Publication date
DE10115214A1 (en) 2002-10-10
EP1245826A3 (en) 2004-02-04
US20020139869A1 (en) 2002-10-03
US6575142B2 (en) 2003-06-10
JP2002357171A (en) 2002-12-13

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