EP3199794A1 - Fuel distribution rail and method for producing the same - Google Patents

Fuel distribution rail and method for producing the same Download PDF

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Publication number
EP3199794A1
EP3199794A1 EP16153634.7A EP16153634A EP3199794A1 EP 3199794 A1 EP3199794 A1 EP 3199794A1 EP 16153634 A EP16153634 A EP 16153634A EP 3199794 A1 EP3199794 A1 EP 3199794A1
Authority
EP
European Patent Office
Prior art keywords
base tube
fuel rail
fuel
rail according
connection
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
EP16153634.7A
Other languages
German (de)
French (fr)
Other versions
EP3199794B1 (en
Inventor
Uwe Fiedler
Manouchehr Kambakhsh
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.)
TI Automotive Heidelberg GmbH
Original Assignee
TI Automotive Heidelberg 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 TI Automotive Heidelberg GmbH filed Critical TI Automotive Heidelberg GmbH
Priority to EP16153634.7A priority Critical patent/EP3199794B1/en
Priority to CN201710055371.3A priority patent/CN107023428B/en
Priority to US15/420,432 priority patent/US10260469B2/en
Priority to JP2017015296A priority patent/JP6845701B2/en
Priority to KR1020170014431A priority patent/KR20170091531A/en
Publication of EP3199794A1 publication Critical patent/EP3199794A1/en
Application granted granted Critical
Publication of EP3199794B1 publication Critical patent/EP3199794B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
    • F02M69/462—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down
    • F02M69/465—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down of fuel rails
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • F02M55/025—Common rails
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/004—Joints; Sealings
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8069—Fuel injection apparatus manufacture, repair or assembly involving removal of material from the fuel apparatus, e.g. by punching, hydro-erosion or mechanical operation
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8084—Fuel injection apparatus manufacture, repair or assembly involving welding or soldering

Definitions

  • the invention relates to a fuel rail for a fuel injection for internal combustion engines in motor vehicles, in particular for gasoline engines.
  • the invention further relates to a method for producing the fuel rail.
  • Fuel rail for the direct injection of gasoline are basically known in practice. They comprise a tube-like element with a fuel channel, from which fuel channel usually branch off three, four or even more outlet openings. The outlet openings are fluidly connected to a respective injection nozzle.
  • the fuel rail also includes an inlet passage for supplying fuel to the fuel rail.
  • the fuel rail is a forging.
  • this requires in the manufacturing process at least one bore per connection piece for generating the connection channel. Due to the required minimum length The connecting pieces are thus deep drilling required, which are expensive. These deep holes are particularly expensive due to the high tolerance requirements in terms of position and diameter, which makes the manufacturing process correspondingly more expensive.
  • the invention is therefore the technical problem of providing a fuel rail, in which the above-mentioned disadvantage is avoided.
  • the invention addresses the technical problem of specifying a fuel rail, in which the manufacturing cost is reduced.
  • the invention teaches a fuel rail for fuel injection for internal combustion engines in motor vehicles, in particular for gasoline engines, comprising a base tube, wherein the base tube has a extending in the longitudinal direction of the base tube fuel passage, wherein the base tube comprises at least two outlet openings, wherein the outlet openings branch off from the fuel channel, wherein a connection element is arranged on the base tube, wherein the connection element has a voltage applied to the base tube abutment wall, wherein the connection element is integrally connected to the base tube, wherein the connection element has at least two connecting pieces, wherein the connecting pieces each have a connection channel to fluidic connection each have an outlet opening, each with an injection nozzle.
  • the invention is based on the finding that a decoupling of the fuel channel and the connecting piece at the beginning of the manufacturing process is very advantageous.
  • the decoupling is accomplished by the fact that the fuel channel is formed by the base tube and the connecting pieces are attached to the base tube only in a later manufacturing step.
  • the Connecting pieces are arranged on the connecting element, which connecting element is firmly bonded and preferably by means of soldering to the base tube.
  • This decoupling has the advantage that initially only the outlet openings are produced by means of bores on the base tube. These holes only need to penetrate the wall thickness of the base pipe, so that a deep drilling process is not required here. As a result, even very high tolerance requirements in terms of position and diameter of the outlet openings are much less expensive.
  • the connection channels can z. B. be made by deep drilling, but then expediently the connection channels have a correspondingly large diameter, so that in this respect only small tolerance requirements must be met. The production cost is thus significantly reduced.
  • connection element comprises steel and advantageously an austenitic steel.
  • the steel of the connection element preferably has an austenitic structural component and is advantageously a duplex steel.
  • connection element and / or the base tube comprises a steel corrosion-resistant against fuel.
  • the base tube may be seamless or double or multi-walled.
  • connection element is firmly bonded and preferably fixed to the base tube by means of soldering, particularly preferably by means of brazing and very particularly preferably by means of high-temperature brazing. It is possible that the connection element is attached by welding to the base tube.
  • connection element comprises a forging part and advantageously a drop forging part. Conveniently, has the connection element on a ridge or burrs or deburred places. It is preferred that the connection element is formed at least predominantly and preferably completely integrally.
  • integral means in particular the production of a forged part or a cast.
  • the connecting pieces are integrally connected to the plant wall.
  • the connection element comprises one and preferably only one casting. The casting preferably comprises cast iron.
  • connection element encloses the base tube at least in sections and preferably along the entire length of the base tube only partially, preferably at most around 350 °, preferably at most around 270 ° and particularly preferably at most around 190 °.
  • the base tube and the connecting element are formed such that the base tube can be inserted into the connecting element due to the partial enclosing of the connecting element.
  • the connecting element has two edges, which run parallel to the longitudinal axis of the base tube and form one end of the connecting element in the circumferential direction and which edges preferably form part of the abutment wall. It is preferred that the two edges extend at least along 50%, 75% and 100% of the length spanned by the outlet openings.
  • a respective weld seam is arranged along the two edges.
  • the connecting element in each case has an arcuate edge at its own ends facing the base tube ends, along which arcuate edges expediently a respective weld seam is arranged.
  • a longitudinal axis of at least one connecting piece or a connecting channel intersects the longitudinal axis of the fuel channel.
  • a longitudinal axis of at least one connection channel or connection piece lies in a plane with the longitudinal axis of the fuel channel. This condition is considered fulfilled if the longitudinal axis of the connection channel or connecting piece does not pass by more than +/- 10% from the inner diameter of the base tube on the longitudinal axis of the fuel channel. It is particularly preferred if the longitudinal axis of the fuel channel and the longitudinal axis of at least one connecting piece or connecting channel lie in one plane and enclose a substantially rectangular angle relative to one another.
  • At least one of the connecting pieces has an inner wall, which inner wall forms the connecting channel, wherein the inner wall is formed integrally with the at least one connecting piece and wherein the inner wall is the innermost wall. It is preferred that the inner wall can be brought into contact with the fuel.
  • the connection piece is integrally formed.
  • the connecting piece is designed so that it has no inner sleeve.
  • At least one connecting piece is assigned at least one connecting piece, which connecting piece extends at least in sections parallel to the at least one connecting piece.
  • the connecting piece runs along its predominant length parallel to the connecting piece.
  • the at least one connecting piece is part of the connecting element and preferably a portion of the forging or casting.
  • the connection piece is formed integrally with the connection element. It is appropriate that the connecting piece and the connecting piece share at least one common wall.
  • the end facing away from the base tube of the at least one connecting piece is aligned with an end of the connecting piece facing away from the base tube. It is expedient that a longitudinal axis of the connecting piece does not intersect the base tube. It is preferred that an end of the connecting piece facing the base tube is aligned with an edge of the connecting element running parallel to the longitudinal axis of the fuel channel.
  • the connecting piece conveniently has a passage opening along its longitudinal axis.
  • the base tube has a wall thickness of at least 1.0 mm, preferably of at least 1.5 mm and particularly preferably of at least 2 mm.
  • a wall thickness of the base tube is at most 15 mm, preferably at most 10 mm and particularly preferably at most 7 mm.
  • the inner diameter of the base tube is advantageously at least 8 mm, preferably at least 12 mm and particularly preferably at least 15 mm.
  • the base tube preferably has an inner diameter of at most 60 mm, preferably at most 50 mm, and particularly preferably at most 40 mm.
  • the abutment wall comprises at least one window-like opening.
  • the connecting element between the at least two connecting pieces on an intermediate region preferably comprises only a part of the abutment wall.
  • the intermediate region is particularly preferably designed like a partial shell and expediently connects the two connecting pieces.
  • the intermediate region comprises at least two window-like openings, wherein the window-like openings are expediently separated from one another by a web.
  • At least one of the diameters of the connection channels is at least a factor of 1.2, preferably 1.5 and particularly preferably 2.0 greater than the diameter of the associated outlet opening.
  • a diameter of at least one or all outlet openings is expediently at least 1.0 mm, preferably at least 1.5 mm and particularly preferably at least 2.0 mm.
  • At least one or all outlet openings expediently have a diameter of at most 20 mm, preferably of at most 15 mm and particularly preferably of at most 10 mm.
  • a diameter of the connecting channels is expediently at least 4 mm, preferably at least 6 mm and particularly preferably at least 8 mm.
  • the connection channels expediently have a diameter of at most 50 mm, preferably of at most 35 mm and particularly preferably of at most 25 mm.
  • connecting pieces or connecting channels only each have a longitudinal axis. It is preferred that none of the connection channels is bent or angled. If the connecting pieces or connecting channels only each have a longitudinal axis, so hereby any connecting pieces or connection channels are excluded, which are designed bent or angled.
  • the fuel rail is designed so that it can be subjected to pressures of at most 1500 bar, preferably up to at most 1000 bar and more preferably up to at most 700 bar.
  • the fuel rail is designed so that it is only suitable for gasoline engines. It is preferred that the fuel rail can withstand the usual pressures in gasoline engines easily, but not the usual pressures in diesel engines.
  • the invention further provides a method for producing a fuel rail, in particular a fuel rail according to the invention, wherein a base tube is provided with a extending in the longitudinal direction of the base tube fuel passage, wherein at least two outlet openings are drilled in the base tube, so that the outlet openings branch off from the fuel channel wherein a connection element is arranged on the base tube, so that a contact wall of the connection element rests against the base tube, wherein the connection element is integrally connected to the base tube, wherein the connection element has at least two connection pieces, wherein the connection pieces each have a connection channel for the fluidic connection of one Have outlet opening, each with an injection nozzle.
  • connection element is produced by forging and more preferably by drop forging.
  • connection element is produced by casting.
  • connection element is connected by means of soldering material fit with the base tube.
  • connection element is connected to the base tube by means of brazing and particularly preferably by means of high-temperature brazing.
  • connection element can also be fastened to the base tube by means of welding.
  • Fig. 1 is a base tube 1 of a fuel rail according to the invention shown.
  • the base tube 1 has a fuel channel 2 extending in the longitudinal direction of the base tube 1. From this fuel channel 2 branch off a total of four outlet openings 3 with a diameter of for example 4 mm. Due to the perspective view can not be seen that on the back of the base tube 1 is still an inlet opening.
  • the base tube 1 consists of an austenitic steel, has a wall thickness of z. B. 3 mm and an exemplary inner diameter of 20 mm.
  • connection element 4 can be seen, which on the base tube 1 from Fig. 1 is put on.
  • each outlet opening 3 of the base tube 1 is assigned a connection piece 6.
  • the connecting pieces 6 connect the outlet openings 3 and thus the fuel channel 2 fluidly with the respective injection nozzles, not shown, via connecting channels 7.
  • the connecting piece 6 is in each case assigned a connecting piece 8, wherein the longitudinal axes of the connecting piece 8 extend parallel to the longitudinal axes of the connecting piece 6.
  • Each connecting piece 8 touches its associated connection piece 6, so that they are a common wall divide.
  • An inner diameter of the connecting piece 6 and a diameter of the connecting channels 7 is for example 12 mm.
  • connection element 4 is designed so that it can rest against the base tube 1, for which purpose it has a contact wall 5.
  • the abutment wall 5 has, between the four connecting pieces 6, an intermediate region 12 which is made relatively thin.
  • the strength of the investment wall 5 in the intermediate regions 12 is z. B. 3 mm.
  • each of the three intermediate regions 12 has two windows 9, which are separated from each other by a web 13.
  • the connection element 4 ideally consists entirely of an austenitic steel.
  • the connecting piece 6 and the connecting piece 8 are integrally connected to the plant wall 5.
  • the terminal of this embodiment was made by swaging.
  • the connection channels 7 are produced by drilling or deep drilling.
  • the base tube 1 and the connection element 4 are assembled by means of soldering. Such a fuel rail is made in Fig. 3 displayed.
  • the base tube 1 has been closed at the ends by means of plugs 10. Further, an inlet nozzle 11 has been soldered to the base tube 1, so that a fluidic connection of the inlet opening with a fuel line, not shown, is possible.

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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)

Abstract

Kraftstoffverteilerleiste für eine Kraftstoffeinspritzung für Brennkraftmaschinen in Kraftfahrzeugen, insbesondere für Ottomotoren. Die Kraftstoffverteilerleiste umfasst ein Basisrohr, wobei das Basisrohr einen sich in Längsrichtung des Basisrohres erstreckenden Kraftstoffkanal aufweist. Das Basisrohr umfasst wenigstens zwei Austrittsöffnungen, wobei die Austrittsöffnungen von dem Kraftstoffkanal abzweigen. Ein Anschlusselement ist an dem Basisrohr angeordnet, wobei das Anschlusselement eine an dem Basisrohr anliegende Anlagewand aufweist. Das Anschlusselement ist stoffschlüssig mit dem Basisrohr verbunden und umfasst wenigstens zwei Anschlussstutzen. Die Anschlussstutzen weisen je einen Anschlusskanal zur fluidischen Verbindung je einer Austrittsöffnung mit je einer Einspritzdüse auf.Fuel rail for fuel injection for internal combustion engines in motor vehicles, in particular for gasoline engines. The fuel rail comprises a base tube, wherein the base tube has a fuel channel extending in the longitudinal direction of the base tube. The base tube comprises at least two outlet openings, wherein the outlet openings branch off from the fuel channel. A connection element is arranged on the base tube, wherein the connection element has an abutment against the base tube abutment wall. The connecting element is integrally connected to the base tube and comprises at least two connecting pieces. The connecting pieces each have a connection channel for the fluidic connection of an outlet opening, each with an injection nozzle.

Description

Die Erfindung betrifft eine Kraftstoffverteilerleiste für eine Kraftstoffeinspritzung für Brennkraftmaschinen in Kraftfahrzeugen, insbesondere für Ottomotoren. Die Erfindung betrifft ferner ein Verfahren zur Herstellung der Kraftstoffverteilerleiste.The invention relates to a fuel rail for a fuel injection for internal combustion engines in motor vehicles, in particular for gasoline engines. The invention further relates to a method for producing the fuel rail.

Kraftstoffverteilerleisten für die Direkteinspritzung von Benzin sind grundsätzlich aus der Praxis bekannt. Sie umfassen ein rohrartiges Element mit einem Kraftstoffkanal, von welchem Kraftstoffkanal üblicherweise drei, vier oder noch mehr Austrittsöffnungen abzweigen. Die Austrittsöffnungen sind fluidisch mit jeweils einer Einspritzdüse verbunden. Die Kraftstoffverteilerleiste umfasst ferner einen Eintrittskanal zwecks Zuführung von Kraftstoff in die Kraftstoffverteilerleiste.Fuel rail for the direct injection of gasoline are basically known in practice. They comprise a tube-like element with a fuel channel, from which fuel channel usually branch off three, four or even more outlet openings. The outlet openings are fluidly connected to a respective injection nozzle. The fuel rail also includes an inlet passage for supplying fuel to the fuel rail.

Hierbei gestaltet sich die fluidische Verbindung der Austrittsöffnungen mit der jeweiligen Einspritzdüse als aufwendig. So ist es in der Praxis zunächst bekannt, ein Basisrohr bereitzustellen, welches den Kraftstoffkanal bildet und sodann mittels Bohrungen entlang des Basisrohres die Austrittsöffnungen herzustellen. An diese Austrittsöffnungen werden dann einzelne Anschlussstutzen mit jeweils einem Anschlusskanal angeschlossen, welcher Anschlusskanal der fluidischen Verbindung der Einspritzdüse dient. Sowohl das Basisrohr als auch die Anschlussstutzen bestehen gemäß diesem aus der Praxis bekannten Stand der Technik aus Stahl.Here, the fluidic connection of the outlet openings with the respective injection nozzle designed as consuming. Thus, it is initially known in practice to provide a base tube which forms the fuel channel and then produce the outlet openings by means of bores along the base tube. At this outlet openings then individual connecting pieces are connected, each having a connection channel, which serves connection channel of the fluidic connection of the injection nozzle. Both the base pipe and the connecting pieces are made of steel according to this known from the prior art.

Gemäß einer anderen Ausführungsform des aus der Praxis bekannten Standes der Technik ist die Kraftstoffverteilerleiste ein Schmiedeteil. Dies aber bedingt im Herstellungsprozess wenigstens eine Bohrung je Anschlussstutzen zur Erzeugung des Anschlusskanals. Auf Grund der erforderlichen Mindestlänge der Anschlussstutzen sind dadurch Tiefbohrungen erforderlich, welche aufwendig sind. Diese Tiefbohrungen sind vor allem auf Grund der hohen Toleranzanforderungen hinsichtlich Position und Durchmesser aufwendig, was den Herstellungsprozess entsprechend kostspieliger macht.According to another embodiment of the known prior art, the fuel rail is a forging. However, this requires in the manufacturing process at least one bore per connection piece for generating the connection channel. Due to the required minimum length The connecting pieces are thus deep drilling required, which are expensive. These deep holes are particularly expensive due to the high tolerance requirements in terms of position and diameter, which makes the manufacturing process correspondingly more expensive.

Der Erfindung liegt damit das technische Problem zugrunde, eine Kraftstoffverteilerleiste anzugeben, bei welcher der vorstehend genannte Nachteil vermieden wird. Insbesondere liegt der Erfindung das technische Problem zugrunde, eine Kraftstoffverteilerleiste anzugeben, bei welcher der Herstellungsaufwand verringert wird.The invention is therefore the technical problem of providing a fuel rail, in which the above-mentioned disadvantage is avoided. In particular, the invention addresses the technical problem of specifying a fuel rail, in which the manufacturing cost is reduced.

Zur Lösung dieses technischen Problems lehrt die Erfindung eine Kraftstoffverteilerleiste für eine Kraftstoffeinspritzung für Brennkraftmaschinen in Kraftfahrzeugen, insbesondere für Ottomotoren, umfassend ein Basisrohr, wobei das Basisrohr einen sich in Längsrichtung des Basisrohres erstreckenden Kraftstoffkanal aufweist, wobei das Basisrohr wenigstens zwei Austrittsöffnungen umfasst, wobei die Austrittsöffnungen von dem Kraftstoffkanal abzweigen, wobei ein Anschlusselement an dem Basisrohr angeordnet ist, wobei das Anschlusselement eine an dem Basisrohr anliegende Anlagewand aufweist, wobei das Anschlusselement stoffschlüssig mit dem Basisrohr verbunden ist, wobei das Anschlusselement wenigstens zwei Anschlussstutzen aufweist, wobei die Anschlussstutzen je einen Anschlusskanal zur fluidischen Verbindung je einer Austrittsöffnung mit je einer Einspritzdüse aufweisen.To solve this technical problem, the invention teaches a fuel rail for fuel injection for internal combustion engines in motor vehicles, in particular for gasoline engines, comprising a base tube, wherein the base tube has a extending in the longitudinal direction of the base tube fuel passage, wherein the base tube comprises at least two outlet openings, wherein the outlet openings branch off from the fuel channel, wherein a connection element is arranged on the base tube, wherein the connection element has a voltage applied to the base tube abutment wall, wherein the connection element is integrally connected to the base tube, wherein the connection element has at least two connecting pieces, wherein the connecting pieces each have a connection channel to fluidic connection each have an outlet opening, each with an injection nozzle.

Der Erfindung liegt die Erkenntnis zugrunde, dass eine Entkopplung des Kraftstoffkanals und der Anschlussstutzen zu Beginn des Herstellungsprozesses sehr vorteilhaft ist. Die Entkopplung wird dadurch bewerkstelligt, dass der Kraftstoffkanal durch das Basisrohr gebildet wird und die Anschlussstutzen erst in einem späteren Herstellungsschritt an dem Basisrohr befestigt werden. Die Anschlussstutzen sind an dem Anschlusselement angeordnet, welches Anschlusselement stoffschlüssig und vorzugsweise mittels Löten an dem Basisrohr befestigt wird. Diese Entkopplung hat den Vorteil, dass zunächst nur die Austrittsöffnungen mittels Bohrungen an dem Basisrohr hergestellt werden. Diese Bohrungen müssen lediglich die Wandstärke des Basisrohres durchdringen, so dass hier ein Tiefbohrprozess nicht erforderlich ist. In der Folge sind auch sehr hohe Toleranzanforderungen hinsichtlich Position und Durchmesser der Austrittsöffnungen deutlich weniger kostspielig. Die Anschlusskanäle können z. B. mittels Tiefbohren hergestellt werden, wobei dann aber zweckmäßigerweise die Anschlusskanäle einen entsprechend großen Durchmesser aufweisen, so dass diesbezüglich nur geringe Toleranzanforderungen erfüllt werden müssen. Der Herstellungsaufwand wird somit deutlich verringert.The invention is based on the finding that a decoupling of the fuel channel and the connecting piece at the beginning of the manufacturing process is very advantageous. The decoupling is accomplished by the fact that the fuel channel is formed by the base tube and the connecting pieces are attached to the base tube only in a later manufacturing step. The Connecting pieces are arranged on the connecting element, which connecting element is firmly bonded and preferably by means of soldering to the base tube. This decoupling has the advantage that initially only the outlet openings are produced by means of bores on the base tube. These holes only need to penetrate the wall thickness of the base pipe, so that a deep drilling process is not required here. As a result, even very high tolerance requirements in terms of position and diameter of the outlet openings are much less expensive. The connection channels can z. B. be made by deep drilling, but then expediently the connection channels have a correspondingly large diameter, so that in this respect only small tolerance requirements must be met. The production cost is thus significantly reduced.

Gemäß einer besonders bevorzugten Ausführungsform umfasst das Anschlusselement Stahl und vorteilhafterweise einen austenitischen Stahl. Der Stahl des Anschlusselementes weist vorzugsweise einen austenitischen Gefügebestandteil auf und ist vorteilhafterweise ein Duplex-Stahl. Zweckmäßigerweise umfasst das Anschlusselement und/oder das Basisrohr einen gegen Kraftstoff korrosionsresistenten Stahl. Das Basisrohr kann nahtlos oder doppel- bzw. mehrwandig ausgebildet sein.According to a particularly preferred embodiment, the connection element comprises steel and advantageously an austenitic steel. The steel of the connection element preferably has an austenitic structural component and is advantageously a duplex steel. Conveniently, the connection element and / or the base tube comprises a steel corrosion-resistant against fuel. The base tube may be seamless or double or multi-walled.

Besonders vorzugsweise ist das Anschlusselement stoffschlüssig und bevorzugt mittels Löten, besonders bevorzugt mittels Hartlöten und ganz besonders bevorzugt mittels Hochtemperatur-Hartlöten an dem Basisrohr befestigt. Es ist möglich, dass das Anschlusselement mittels Schweißen an dem Basisrohr befestigt ist.Particularly preferably, the connection element is firmly bonded and preferably fixed to the base tube by means of soldering, particularly preferably by means of brazing and very particularly preferably by means of high-temperature brazing. It is possible that the connection element is attached by welding to the base tube.

Gemäß einer bevorzugten Ausführungsform umfasst das Anschlusselement ein Schmiedeteil und vorteilhafterweise ein Gesenkschmiedeteil. Zweckmäßigerweise weist das Anschlusselement einen Grat bzw. Grate bzw. entgratete Stellen auf. Es ist bevorzugt, dass das Anschlusselement wenigstens überwiegend und vorzugsweise vollständig integral ausgebildet ist. Der Ausdruck "integral" meint insbesondere die Herstellung aus einem Schmiedeteil oder aus einem Guss. Gemäß einer besonders bevorzugten Ausführungsform sind die Anschlussstutzen integral mit der Anlagewand verbunden. Gemäß einer Ausführungsform umfasst das Anschlusselement ein und vorzugsweise lediglich ein Gussteil. Das Gussteil umfasst vorzugsweise Gusseisen.According to a preferred embodiment, the connection element comprises a forging part and advantageously a drop forging part. Conveniently, has the connection element on a ridge or burrs or deburred places. It is preferred that the connection element is formed at least predominantly and preferably completely integrally. The term "integral" means in particular the production of a forged part or a cast. According to a particularly preferred embodiment, the connecting pieces are integrally connected to the plant wall. According to one embodiment, the connection element comprises one and preferably only one casting. The casting preferably comprises cast iron.

Es wird bevorzugt, dass das Anschlusselement das Basisrohr wenigstens längenabschnittsweise und bevorzugt entlang der ganzen Länge des Basisrohres lediglich teilweise, bevorzugt höchstens um 350°, vorzugsweise höchstens um 270° und besonders vorzugsweise höchstens um 190° umschließt. In einer speziellen Ausführungsform sind das Basisrohr und das Anschlusselement so ausgebildet, dass das Basisrohr aufgrund des nur teilweisen Umschließens des Anschlusselementes in das Anschlusselement einlegbar ist. Sehr vorteilhafterweise weist das Anschlusselement zwei Kanten auf, welche parallel zur Längsachse des Basisrohres verlaufen und in Umfangsrichtung hier ein Ende des Anschlusselementes bilden und welche Kanten vorzugsweise einen Teil der Anlagewand bilden. Es ist bevorzugt, dass sich die beiden Kanten wenigstens entlang von 50 % bzw. 75 % bzw. 100 % der von den Austrittsöffnungen aufgespannten Länge erstrecken. Vorteilhafterweise ist entlang der beiden Kanten je eine Schweißnaht angeordnet. Es ist zweckmäßig, dass das Anschlusselement an seinen den Basisrohrenden zugewandten eigenen Enden jeweils eine bogenförmig verlaufende Kante aufweist, entlang welcher bogenförmigen Kanten zweckmäßigerweise jeweils eine Schweißnaht angeordnet ist.It is preferred that the connection element encloses the base tube at least in sections and preferably along the entire length of the base tube only partially, preferably at most around 350 °, preferably at most around 270 ° and particularly preferably at most around 190 °. In a specific embodiment, the base tube and the connecting element are formed such that the base tube can be inserted into the connecting element due to the partial enclosing of the connecting element. Very advantageously, the connecting element has two edges, which run parallel to the longitudinal axis of the base tube and form one end of the connecting element in the circumferential direction and which edges preferably form part of the abutment wall. It is preferred that the two edges extend at least along 50%, 75% and 100% of the length spanned by the outlet openings. Advantageously, a respective weld seam is arranged along the two edges. It is expedient that the connecting element in each case has an arcuate edge at its own ends facing the base tube ends, along which arcuate edges expediently a respective weld seam is arranged.

Es liegt im Rahmen der Erfindung, dass eine Längsachse wenigstens eines Anschlussstutzens bzw. eines Anschlusskanals die Längsachse des Kraftstoffkanals schneidet. Mit anderen Worten ist es zweckmäßig, dass eine Längsachse wenigstens eines Anschlusskanals bzw. Anschlussstutzens in einer Ebene mit der Längsachse des Kraftstoffkanals liegt. Diese Bedingung gilt als erfüllt, wenn die Längsachse des Anschlusskanals bzw. Anschlussstutzens um nicht mehr als +/- 10% vom Innendurchmesser des Basisrohres an der Längsachse des Kraftstoffkanals vorbeiläuft. Es ist besonders bevorzugt, wenn die Längssachse des Kraftstoffkanals und die Längsachse wenigstens eines Anschlussstutzens bzw. Anschlusskanals in einer Ebene liegen und zueinander einen im Wesentlichen rechtwinkligen Winkel einschließen.It is within the scope of the invention that a longitudinal axis of at least one connecting piece or a connecting channel intersects the longitudinal axis of the fuel channel. In other words, it is expedient that a longitudinal axis of at least one connection channel or connection piece lies in a plane with the longitudinal axis of the fuel channel. This condition is considered fulfilled if the longitudinal axis of the connection channel or connecting piece does not pass by more than +/- 10% from the inner diameter of the base tube on the longitudinal axis of the fuel channel. It is particularly preferred if the longitudinal axis of the fuel channel and the longitudinal axis of at least one connecting piece or connecting channel lie in one plane and enclose a substantially rectangular angle relative to one another.

Es liegt im Rahmen der Erfindung, dass wenigstens einer der Anschlussstutzen eine Innenwand aufweist, welche Innenwand den Anschlusskanal bildet, wobei die Innenwand integral mit dem wenigstens einen Anschlussstutzen ausgebildet ist und wobei die Innenwand die innerste Wand ist. Es ist bevorzugt, dass die Innenwand in Berührung mit dem Kraftstoff bringbar ist. Zweckmäßigerweise ist der Anschlussstutzen integral ausgebildet. Insbesondere ist der Anschlussstutzen so ausgebildet, dass er keine innenliegende Hülse aufweist.It is within the scope of the invention that at least one of the connecting pieces has an inner wall, which inner wall forms the connecting channel, wherein the inner wall is formed integrally with the at least one connecting piece and wherein the inner wall is the innermost wall. It is preferred that the inner wall can be brought into contact with the fuel. Conveniently, the connection piece is integrally formed. In particular, the connecting piece is designed so that it has no inner sleeve.

Gemäß einer bevorzugten Ausführungsform ist wenigstens einem Anschlussstutzen wenigstens ein Verbindungsstutzen zugeordnet, welcher Verbindungsstutzen wenigstens abschnittsweise parallel zu dem wenigstens einen Anschlussstutzen verläuft. Bevorzugt verläuft der Verbindungsstutzen entlang seiner überwiegenden Länge parallel zu dem Anschlussstutzen. Zweckmäßigerweise ist der wenigstens eine Verbindungsstutzen ein Teil des Anschlusselementes und bevorzugt ein Abschnitt des Schmiede- bzw. Gussteiles. Besonders bevorzugt ist der Verbindungsstutzen integral mit dem Anschlusselement ausgebildet. Es ist zweckmäßig, dass sich der Anschlussstutzen und der Verbindungsstutzen wenigstens eine gemeinsame Wand teilen. Zweckmäßigerweise fluchtet das dem Basisrohr abgewandte Ende des wenigstens einen Verbindungsstutzens mit einem dem Basisrohr abgewandten Ende des Anschlussstutzens. Es ist zweckmäßig, dass eine Längsachse des Verbindungsstutzens das Basisrohr nicht schneidet. Es ist bevorzugt, dass ein dem Basisrohr zugewandtes Ende des Verbindungsstutzens mit einer zur Längsachse des Kraftstoffkanals parallel verlaufenden Kante des Anschlusselementes fluchtet. Der Verbindungsstutzen weist praktischerweise eine Durchgangsöffnung entlang seiner Längsachse auf.According to a preferred embodiment, at least one connecting piece is assigned at least one connecting piece, which connecting piece extends at least in sections parallel to the at least one connecting piece. Preferably, the connecting piece runs along its predominant length parallel to the connecting piece. Conveniently, the at least one connecting piece is part of the connecting element and preferably a portion of the forging or casting. Particularly preferably, the connection piece is formed integrally with the connection element. It is appropriate that the connecting piece and the connecting piece share at least one common wall. Conveniently, the end facing away from the base tube of the at least one connecting piece is aligned with an end of the connecting piece facing away from the base tube. It is expedient that a longitudinal axis of the connecting piece does not intersect the base tube. It is preferred that an end of the connecting piece facing the base tube is aligned with an edge of the connecting element running parallel to the longitudinal axis of the fuel channel. The connecting piece conveniently has a passage opening along its longitudinal axis.

Es ist vorteilhaft, wenn das Basisrohr eine Wandstärke von wenigstens 1,0 mm, bevorzugt von wenigstens 1,5 mm und besonders bevorzugt von wenigstens 2 mm aufweist. Zweckmäßigerweise beträgt eine Wandstärke des Basisrohres höchstens 15 mm, vorzugsweise höchstens 10 mm und besonders vorzugsweise höchstens 7 mm. Der Innendurchmesser des Basisrohres beträgt vorteilhafterweise wenigstens 8 mm, vorzugsweise wenigstens 12 mm und besonders vorzugsweise wenigstens 15 mm. Das Basisrohr weist bevorzugt einen Innendurchmesser von höchstens 60 mm, vorzugsweise von höchstens 50 mm und besonders vorzugsweise von höchstens 40 mm auf.It is advantageous if the base tube has a wall thickness of at least 1.0 mm, preferably of at least 1.5 mm and particularly preferably of at least 2 mm. Conveniently, a wall thickness of the base tube is at most 15 mm, preferably at most 10 mm and particularly preferably at most 7 mm. The inner diameter of the base tube is advantageously at least 8 mm, preferably at least 12 mm and particularly preferably at least 15 mm. The base tube preferably has an inner diameter of at most 60 mm, preferably at most 50 mm, and particularly preferably at most 40 mm.

Gemäß einer bevorzugten Ausführungsform umfasst die Anlagewand wenigstens eine fensterartige Öffnung. Zweckmäßigerweise weist das Anschlusselement zwischen den wenigstens zwei Anschlussstutzen einen Zwischenbereich auf. Der Zwischenbereich umfasst vorzugsweise lediglich einen Teil der Anlagewand. Der Zwischenbereich ist besonders bevorzugt teilschalenartig ausgebildet und verbindet zweckmäßigerweise die zwei Anschlussstutzen. Gemäß einer bevorzugten Ausführungsform umfasst der Zwischenbereich wenigstens zwei fensterartige Öffnungen, wobei die fensterartigen Öffnungen zweckmäßigerweise durch einen Steg voneinander getrennt sind.According to a preferred embodiment, the abutment wall comprises at least one window-like opening. Conveniently, the connecting element between the at least two connecting pieces on an intermediate region. The intermediate region preferably comprises only a part of the abutment wall. The intermediate region is particularly preferably designed like a partial shell and expediently connects the two connecting pieces. According to a preferred embodiment, the intermediate region comprises at least two window-like openings, wherein the window-like openings are expediently separated from one another by a web.

Gemäß einer besonders bevorzugten Ausführungsform ist wenigstens einer der Durchmesser der Anschlusskanäle wenigstens um den Faktor 1,2, bevorzugt 1,5 und besonders bevorzugt 2,0 größer gegenüber dem Durchmesser der zugeordneten Austrittsöffnung. Ein Durchmesser wenigstens einer der bzw. aller Austrittsöffnungen beträgt zweckmäßigerweise wenigstens 1,0 mm, bevorzugt wenigstens 1,5 mm und besonders bevorzugt wenigstens 2,0 mm. Wenigstens eine der bzw. alle Austrittsöffnungen weisen zweckmäßigerweise einen Durchmesser von höchstens 20 mm, bevorzugt von höchstens 15 mm und besonders bevorzugt von höchstens 10 mm auf. Ein Durchmesser der Anschlusskanäle beträgt zweckmäßigerweise wenigstens 4 mm, vorzugsweise wenigstens 6 mm und besonders vorzugsweise wenigstens 8 mm. Die Anschlusskanäle weisen zweckmäßigerweise einen Durchmesser von höchstens 50 mm, bevorzugt von höchstens 35 mm und besonders bevorzugt von höchstens 25 mm auf.According to a particularly preferred embodiment, at least one of the diameters of the connection channels is at least a factor of 1.2, preferably 1.5 and particularly preferably 2.0 greater than the diameter of the associated outlet opening. A diameter of at least one or all outlet openings is expediently at least 1.0 mm, preferably at least 1.5 mm and particularly preferably at least 2.0 mm. At least one or all outlet openings expediently have a diameter of at most 20 mm, preferably of at most 15 mm and particularly preferably of at most 10 mm. A diameter of the connecting channels is expediently at least 4 mm, preferably at least 6 mm and particularly preferably at least 8 mm. The connection channels expediently have a diameter of at most 50 mm, preferably of at most 35 mm and particularly preferably of at most 25 mm.

Es ist bevorzugt, dass die Anschlussstutzen bzw. Anschlusskanäle lediglich je eine Längsachse aufweisen. Es ist bevorzugt, dass keiner der Anschlusskanäle gebogen oder gewinkelt ausgeführt ist. Wenn die Anschlussstutzen bzw. Anschlusskanäle lediglich je eine Längsachse aufweisen, so werden hiermit jegliche Anschlussstutzen bzw. Anschlusskanäle ausgeschlossen, welche gebogen oder gewinkelt ausgeführt sind.It is preferred that the connecting pieces or connecting channels only each have a longitudinal axis. It is preferred that none of the connection channels is bent or angled. If the connecting pieces or connecting channels only each have a longitudinal axis, so hereby any connecting pieces or connection channels are excluded, which are designed bent or angled.

Es ist besonders vorteilhaft, wenn die Kraftstoffverteilerleiste so ausgebildet ist, dass sie mit Drücken bis höchstens 1.500 bar, vorzugsweise bis höchstens 1.000 bar und besonders vorzugsweise bis höchstens 700 bar beaufschlagt werden kann. Zweckmäßigerweise ist die Kraftstoffverteilerleiste so ausgebildet, dass sie lediglich für Ottomotoren verwendbar ist. Es ist bevorzugt, dass die Kraftstoffverteilerleiste den in Ottomotoren üblichen Drücken problemlos widerstehen kann, nicht aber den in Dieselmotoren üblichen Drücken.It is particularly advantageous if the fuel rail is designed so that it can be subjected to pressures of at most 1500 bar, preferably up to at most 1000 bar and more preferably up to at most 700 bar. Conveniently, the fuel rail is designed so that it is only suitable for gasoline engines. It is preferred that the fuel rail can withstand the usual pressures in gasoline engines easily, but not the usual pressures in diesel engines.

Gegenstand der Erfindung ist ferner ein Verfahren zur Herstellung einer Kraftstoffverteilerleiste, insbesondere einer erfindungsgemäßen Kraftstoffverteilerleiste, wobei ein Basisrohr mit einem sich in Längsrichtung des Basisrohres erstreckenden Kraftstoffkanal bereitgestellt wird, wobei in das Basisrohr wenigstens zwei Austrittsöffnungen gebohrt werden, so dass die Austrittsöffnungen von dem Kraftstoffkanal abzweigen, wobei ein Anschlusselement an dem Basisrohr angeordnet wird, so dass eine Anlagewand des Anschlusselementes an dem Basisrohr anliegt, wobei das Anschlusselement stoffschlüssig mit dem Basisrohr verbunden wird, wobei das Anschlusselement wenigstens zwei Anschlussstutzen aufweist, wobei die Anschlussstutzen je einen Anschlusskanal zur fluidischen Verbindung je einer Austrittsöffnung mit je einer Einspritzdüse aufweisen.The invention further provides a method for producing a fuel rail, in particular a fuel rail according to the invention, wherein a base tube is provided with a extending in the longitudinal direction of the base tube fuel passage, wherein at least two outlet openings are drilled in the base tube, so that the outlet openings branch off from the fuel channel wherein a connection element is arranged on the base tube, so that a contact wall of the connection element rests against the base tube, wherein the connection element is integrally connected to the base tube, wherein the connection element has at least two connection pieces, wherein the connection pieces each have a connection channel for the fluidic connection of one Have outlet opening, each with an injection nozzle.

Gemäß einer bevorzugten Ausführungsform wird das Anschlusselement durch Schmieden und besonders bevorzugt durch Gesenkschmieden hergestellt. Gemäß einer Ausführungsform wird das Anschlusselement mittels Gießen erzeugt. Besonders vorzugsweise wird das Anschlusselement mittels Löten stoffschlüssig mit dem Basisrohr verbunden. Vorzugsweise wird das Anschlusselement mittels Hartlöten und besonders vorzugsweise mittels Hochtemperatur-Hartlöten mit dem Basisrohr verbunden. Das Anschlusselement kann aber auch mittels Schweißen an dem Basisrohr befestigt werden.According to a preferred embodiment, the connection element is produced by forging and more preferably by drop forging. According to one embodiment, the connection element is produced by casting. Particularly preferably, the connection element is connected by means of soldering material fit with the base tube. Preferably, the connection element is connected to the base tube by means of brazing and particularly preferably by means of high-temperature brazing. However, the connection element can also be fastened to the base tube by means of welding.

Nachfolgend wird die Erfindung anhand einer lediglich ein Ausführungsbeispiel darstellenden Zeichnung näher erläutert. Es zeigen in schematischer Darstellung

Fig. 1
eine perspektivische Ansicht eines Basisrohres einer erfindungsgemäßen Kraftstoffverteilerleiste,
Fig. 2
eine perspektivische Ansicht eines Anschlusselementes der Kraftstoffverteilerleiste und
Fig. 3
eine perspektivische Ansicht der zusammengebauten Kraftstoffverteilerleiste, umfassend das Basisrohr aus Fig. 1 und das Anschlusselement aus Fig. 2.
The invention will be explained in more detail with reference to a drawing showing only one exemplary embodiment. It show in a schematic representation
Fig. 1
a perspective view of a base tube of a fuel rail according to the invention,
Fig. 2
a perspective view of a connecting element of the fuel rail and
Fig. 3
a perspective view of the assembled fuel rail, comprising the base tube Fig. 1 and the connection element Fig. 2 ,

In Fig. 1 ist ein Basisrohr 1 einer erfindungsgemäßen Kraftstoffverteilerleiste abgebildet. Das Basisrohr 1 weist einen sich in Längsrichtung des Basisrohres 1 erstreckenden Kraftstoffkanal 2 auf. Von diesem Kraftstoffkanal 2 zweigen insgesamt vier Austrittsöffnungen 3 mit einem Durchmesser von beispielsweise 4 mm ab. Aufgrund der perspektivischen Darstellung ist nicht zu sehen, dass sich auf der Rückseite des Basisrohres 1 noch eine Eintrittsöffnung befindet. Das Basisrohr 1 besteht aus einem austenitischen Stahl, weist eine Wandstärke von z. B. 3 mm und einen beispielhaften Innendurchmesser von 20 mm auf.In Fig. 1 is a base tube 1 of a fuel rail according to the invention shown. The base tube 1 has a fuel channel 2 extending in the longitudinal direction of the base tube 1. From this fuel channel 2 branch off a total of four outlet openings 3 with a diameter of for example 4 mm. Due to the perspective view can not be seen that on the back of the base tube 1 is still an inlet opening. The base tube 1 consists of an austenitic steel, has a wall thickness of z. B. 3 mm and an exemplary inner diameter of 20 mm.

In Fig. 2 ist ein Anschlusselement 4 ersichtlich, welches auf das Basisrohr 1 aus Fig. 1 aufgesetzt wird. Dabei ist jeder Austrittsöffnung 3 des Basisrohres 1 ein Anschlussstutzen 6 zugeordnet. Die Anschlussstutzen 6 verbinden die Austrittsöffnungen 3 und damit den Kraftstoffkanal 2 fluidisch mit den jeweiligen nicht dargestellten Einspritzdüsen über Anschlusskanäle 7. Den Anschlussstutzen 6 ist jeweils ein Verbindungsstutzen 8 zugeordnet, wobei sich die Längsachsen der Verbindungsstutzen 8 parallel zu den Längsachsen der Anschlussstutzen 6 erstrecken. Jeder Verbindungsstutzen 8 berührt den ihm zugeordneten Anschlussstutzen 6, so dass sie sich eine gemeinsame Wand teilen. Ein Innendurchmesser der Anschlussstutzen 6 bzw. ein Durchmesser der Anschlusskanäle 7 beträgt beispielsweise 12 mm.In Fig. 2 is a connection element 4 can be seen, which on the base tube 1 from Fig. 1 is put on. In this case, each outlet opening 3 of the base tube 1 is assigned a connection piece 6. The connecting pieces 6 connect the outlet openings 3 and thus the fuel channel 2 fluidly with the respective injection nozzles, not shown, via connecting channels 7. The connecting piece 6 is in each case assigned a connecting piece 8, wherein the longitudinal axes of the connecting piece 8 extend parallel to the longitudinal axes of the connecting piece 6. Each connecting piece 8 touches its associated connection piece 6, so that they are a common wall divide. An inner diameter of the connecting piece 6 and a diameter of the connecting channels 7 is for example 12 mm.

Das Anschlusselement 4 ist so ausgebildet, dass es an dem Basisrohr 1 anliegen kann, wozu es eine Anlagewand 5 aufweist. Die Anlagewand 5 weist in diesem Ausführungsbeispiel zwischen den vier Anschlussstutzen 6 jeweils einen Zwischenbereich 12 auf, welcher verhältnismäßig dünn ausgebildet ist. Die Stärke der Anlagewand 5 in den Zwischenbereichen 12 beträgt z. B. 3 mm. Ferner weist jeder der drei Zwischenbereiche 12 zwei Fenster 9 auf, welche jeweils durch einen Steg 13 voneinander getrennt sind. Das Anschlusselement 4 besteht idealerweise vollständig aus einem austenitischen Stahl. Somit sind insbesondere auch die Anschlussstutzen 6 und die Verbindungsstutzen 8 integral mit der Anlagewand 5 verbunden. Das Anschlusselement dieses Ausführungsbeispiels wurde durch Gesenkschmieden hergestellt. In einem nachfolgenden Schritt werden die Anschlusskanäle 7 durch Bohren bzw. Tiefbohren erzeugt.The connection element 4 is designed so that it can rest against the base tube 1, for which purpose it has a contact wall 5. In this exemplary embodiment, the abutment wall 5 has, between the four connecting pieces 6, an intermediate region 12 which is made relatively thin. The strength of the investment wall 5 in the intermediate regions 12 is z. B. 3 mm. Furthermore, each of the three intermediate regions 12 has two windows 9, which are separated from each other by a web 13. The connection element 4 ideally consists entirely of an austenitic steel. Thus, in particular, the connecting piece 6 and the connecting piece 8 are integrally connected to the plant wall 5. The terminal of this embodiment was made by swaging. In a subsequent step, the connection channels 7 are produced by drilling or deep drilling.

Das Basisrohr 1 und das Anschlusselement 4 werden mittels Löten zusammengesetzt. Eine derart hergestellte Kraftstoffverteilerleiste ist in Fig. 3 abgebildet. Das Basisrohr 1 ist an den Enden mittels Stopfen 10 verschlossen worden. Ferner ist ein Eintrittsstutzen 11 so an das Basisrohr 1 angelötet worden, so dass eine fluidische Verbindung der Eintrittsöffnung mit einer nicht abgebildeten Kraftstoffleitung möglich ist.The base tube 1 and the connection element 4 are assembled by means of soldering. Such a fuel rail is made in Fig. 3 displayed. The base tube 1 has been closed at the ends by means of plugs 10. Further, an inlet nozzle 11 has been soldered to the base tube 1, so that a fluidic connection of the inlet opening with a fuel line, not shown, is possible.

Claims (15)

Kraftstoffverteilerleiste für eine Kraftstoffeinspritzung für Brennkraftmaschinen in Kraftfahrzeugen, insbesondere für Ottomotoren, umfassend ein Basisrohr (1), wobei das Basisrohr (1) einen sich in Längsrichtung des Basisrohres (1) erstreckenden Kraftstoffkanal (2) aufweist, wobei das Basisrohr (1) wenigstens zwei Austrittsöffnungen (3) umfasst, wobei die Austrittsöffnungen (3) von dem Kraftstoffkanal (2) abzweigen, wobei ein Anschlusselement (4) an dem Basisrohr (1) angeordnet ist, wobei das Anschlusselement (4) eine an dem Basisrohr (1) anliegende Anlagewand (5) aufweist, wobei das Anschlusselement (4) stoffschlüssig mit dem Basisrohr (1) verbunden ist, wobei das Anschlusselement (4) wenigstens zwei Anschlussstutzen (6) aufweist, wobei die Anschlussstutzen (6) je einen Anschlusskanal (7) zur fluidischen Verbindung je einer Austrittsöffnung (3) mit je einer Einspritzdüse aufweisen.Fuel rail for fuel injection for internal combustion engines in motor vehicles, in particular for gasoline engines, comprising a base tube (1), wherein the base tube (1) in the longitudinal direction of the base tube (1) extending fuel channel (2), wherein the base tube (1) at least two Outlet openings (3), wherein the outlet openings (3) branch off from the fuel channel (2), wherein a connection element (4) on the base tube (1) is arranged, wherein the connection element (4) on the base pipe (1) adjacent conditioning wall (5), wherein the connecting element (4) is materially connected to the base tube (1), wherein the connecting element (4) has at least two connecting pieces (6), wherein the connecting pieces (6) each have a connection channel (7) for fluidic connection each have an outlet opening (3), each with an injection nozzle. Kraftstoffverteilerleiste nach Anspruch 1, wobei das Anschlusselement (4) Stahl aufweist.Fuel rail according to claim 1, wherein the connecting element (4) comprises steel. Kraftstoffverteilerleiste nach einem der Ansprüche 1 oder 2, wobei das Basisrohr (1) Stahl aufweist.Fuel rail according to one of claims 1 or 2, wherein the base tube (1) comprises steel. Kraftstoffverteilerleiste nach einem der Ansprüche 1 bis 3, wobei das Anschlusselement (4) mittels Löten an dem Basisrohr (1) befestigt ist.Fuel rail according to one of claims 1 to 3, wherein the connecting element (4) by means of soldering to the base tube (1) is attached. Kraftstoffverteilerleiste nach einem der Ansprüche 1 bis 4, wobei das Anschlusselement (4) das Basisrohr (1) wenigstens längenabschnittsweise lediglich teilweise umschließt.Fuel rail according to one of claims 1 to 4, wherein the connecting element (4), the base tube (1) encloses at least a portion of sections only partially. Kraftstoffverteilerleiste nach einem der Ansprüche 1 bis 5, wobei eine Längsachse wenigstens eines der Anschlussstutzen (6) in einer Ebene mit der Längsachse des Kraftstoffkanals (2) liegt.Fuel rail according to one of claims 1 to 5, wherein a longitudinal axis of at least one of the connecting piece (6) lies in a plane with the longitudinal axis of the fuel channel (2). Kraftstoffverteilerleiste nach einem der Ansprüche 1 bis 6, wobei wenigstens einer der Anschlussstutzen (6) eine Innenwand aufweist, welche Innenwand den Anschlusskanal (7) bildet, wobei die Innenwand integral mit dem wenigstens einen Anschlussstutzen (6) ausgebildet ist und wobei die Innenwand die innerste Wand ist.Fuel rail according to one of claims 1 to 6, wherein at least one of the connecting pieces (6) has an inner wall, which inner wall forms the connecting channel (7), wherein the inner wall is formed integrally with the at least one connecting piece (6) and wherein the inner wall of the innermost Wall is. Kraftstoffverteilerleiste nach einem der Ansprüche 1 bis 7, wobei wenigstens einem Anschlussstutzen (6) wenigstens ein Verbindungsstutzen (8) zugeordnet ist, welcher Verbindungsstutzen (8) wenigstens abschnittsweise parallel zu dem wenigstens einen Anschlussstutzen (6) verläuft.Fuel rail according to one of claims 1 to 7, wherein at least one connecting piece (6) is associated with at least one connecting piece (8), which connecting piece (8) extends at least in sections parallel to the at least one connecting piece (6). Kraftstoffverteilerleiste nach einem der Ansprüche 1 bis 8, wobei das Basisrohr (1) eine Wandstärke von wenigstens 1,0 mm, bevorzugt von wenigstens 1,5 mm und besonders bevorzugt von wenigstens 2,0 mm aufweist.Fuel rail according to one of claims 1 to 8, wherein the base tube (1) has a wall thickness of at least 1.0 mm, preferably of at least 1.5 mm and more preferably of at least 2.0 mm. Kraftstoffverteilerleiste nach einem der Ansprüche 1 bis 9, wobei das Anschlusselement (4) ein Schmiedeteil umfasst.Fuel rail according to one of claims 1 to 9, wherein the connecting element (4) comprises a forging. Kraftstoffverteilerleiste nach einem der Ansprüche 1 bis 10, wobei die Anlagewand (5) wenigstens eine fensterartige Öffnung (9) umfasst.Fuel rail according to one of claims 1 to 10, wherein the abutment wall (5) comprises at least one window-like opening (9). Kraftstoffverteilerleiste nach einem der Ansprüche 1 bis 11, wobei der Innendurchmesser eines der Anschlusskanäle (7) wenigstens um den Faktor 1,2, vorzugsweise 1,5 und besonders vorzugsweise 2,0 größer gegenüber dem Durchmesser der zugeordneten Austrittsöffnung (3) ist.Fuel rail according to one of claims 1 to 11, wherein the inner diameter of one of the connecting channels (7) at least by a factor of 1.2, preferably 1.5 and particularly preferably 2.0 greater than the diameter of the associated outlet opening (3). Kraftstoffverteilerleiste nach einem der Ansprüche 1 bis 12, wobei die Anschlussstutzen (6) bzw. Anschlusskanäle (7) lediglich je eine Längsachse aufweisen.Fuel rail according to one of claims 1 to 12, wherein the connecting piece (6) or connecting channels (7) only each have a longitudinal axis. Kraftstoffverteilerleiste nach einem der Ansprüche 1 bis 13, wobei die Kraftstoffverteilerleiste so ausgebildet ist, dass sie mit Drücken bis höchstens 1.500 bar, vorzugsweise bis höchstens 1.000 bar und besonders vorzugsweise bis höchstens 700 bar beaufschlagt werden kann.Fuel rail according to one of claims 1 to 13, wherein the fuel rail is designed so that it can be subjected to pressures of at most 1,500 bar, preferably up to at most 1,000 bar and more preferably up to at most 700 bar. Verfahren zur Herstellung einer Kraftstoffverteilerleiste, insbesondere einer Kraftstoffverteilerleiste gemäß wenigstens einem der Ansprüche 1 bis 14, wobei ein Basisrohr (1) mit einem sich in Längsrichtung des Basisrohres (1) erstreckendem Kraftstoffkanal (2) bereitgestellt wird, wobei in das Basisrohr (1) wenigstens zwei Austrittsöffnungen (3) gebohrt werden, so dass die Austrittsöffnungen (3) von dem Kraftstoffkanal (2) abzweigen, wobei ein Anschlusselement (4) an dem Basisrohr (1) angeordnet wird, so dass eine Anlagewand (5) des Anschlusselementes (4) an dem Basisrohr (1) anliegt, wobei das Anschlusselement (4) stoffschlüssig mit dem Basisrohr (1) verbunden wird, wobei das Anschlusselement (4) wenigstens zwei Anschlussstutzen (6) aufweist, wobei die Anschlussstutzen (6) je einen Anschlusskanal (7) zur fluidischen Verbindung je einer Austrittsöffnung (3) mit je einer Einspritzdüse aufweisen.A method for producing a fuel rail, in particular a fuel rail according to at least one of claims 1 to 14, wherein a base tube (1) is provided with a in the longitudinal direction of the base tube (1) extending fuel passage (2), wherein in the base tube (1) at least two outlet openings (3) are drilled so that the outlet openings (3) branch off from the fuel channel (2), wherein a connection element (4) is arranged on the base tube (1) so that a contact wall (5) of the connection element (4) on the base tube (1), wherein the connection element (4) is materially connected to the base tube (1), wherein the connection element (4) has at least two connecting pieces (6), wherein the connecting pieces (6) each have a connection channel (7) for the fluidic connection each having an outlet opening (3), each having an injection nozzle.
EP16153634.7A 2016-02-01 2016-02-01 Fuel distribution rail and method for producing the same Not-in-force EP3199794B1 (en)

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EP16153634.7A EP3199794B1 (en) 2016-02-01 2016-02-01 Fuel distribution rail and method for producing the same
CN201710055371.3A CN107023428B (en) 2016-02-01 2017-01-25 Fuel distribution strip and method for the production thereof
US15/420,432 US10260469B2 (en) 2016-02-01 2017-01-31 Fuel distributor rail and method for manufacturing same
JP2017015296A JP6845701B2 (en) 2016-02-01 2017-01-31 Fuel distribution races and methods for their manufacture
KR1020170014431A KR20170091531A (en) 2016-02-01 2017-02-01 Fuel distributor rail and method for manufacturing same

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DE102019220377A1 (en) * 2019-12-20 2021-06-24 Robert Bosch Gmbh Fluid distributor for an injection system, in particular a fuel distributor strip for a fuel injection system for mixture-compressing, externally ignited internal combustion engines

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US10260469B2 (en) 2019-04-16
EP3199794B1 (en) 2018-06-27
JP6845701B2 (en) 2021-03-24
US20170218903A1 (en) 2017-08-03
KR20170091531A (en) 2017-08-09
CN107023428A (en) 2017-08-08
CN107023428B (en) 2020-11-03

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