EP1442211B1 - Method for producing a fuel accumulator line comprising a prestressed connection piece - Google Patents
Method for producing a fuel accumulator line comprising a prestressed connection piece Download PDFInfo
- Publication number
- EP1442211B1 EP1442211B1 EP02776874A EP02776874A EP1442211B1 EP 1442211 B1 EP1442211 B1 EP 1442211B1 EP 02776874 A EP02776874 A EP 02776874A EP 02776874 A EP02776874 A EP 02776874A EP 1442211 B1 EP1442211 B1 EP 1442211B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fuel storage
- storage line
- line
- connection
- fuel accumulator
- 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.)
- Expired - Lifetime
Links
- 239000000446 fuel Substances 0.000 title claims description 98
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 238000000034 method Methods 0.000 claims description 14
- 238000007789 sealing Methods 0.000 claims description 13
- 238000002485 combustion reaction Methods 0.000 claims description 9
- 238000007906 compression Methods 0.000 claims description 9
- 238000003860 storage Methods 0.000 description 84
- 230000006835 compression Effects 0.000 description 7
- 238000002347 injection Methods 0.000 description 7
- 239000007924 injection Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 230000002123 temporal effect Effects 0.000 description 4
- 239000007769 metal material Substances 0.000 description 3
- 238000002788 crimping Methods 0.000 description 2
- 230000008092 positive effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
Images
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
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S138/00—Pipes and tubular conduits
- Y10S138/05—Pre-stress
Definitions
- the invention relates to a method for producing a fuel storage line according to the preamble of patent claim 1 and a fuel storage line according to the preamble of patent claim 6.
- Fuel storage lines are used in the field of automotive technology to build a common rail injection system.
- the fuel storage line serves as a storage volume in which a fuel is kept at a relatively high pressure.
- the fuel is discharged via associated injection valves from the fuel storage line into the combustion chamber of the internal combustion engine.
- One application of the fuel storage line is in both direct injection gasoline and direct injection diesel engines.
- connection of a line to the fuel storage line is a critical function that has a major influence on the quality of the fuel storage line.
- Connection of a pipe requires a hole in the wall of the fuel storage pipe. A wall with a hole has the disadvantage that cracks form in the area of the hole, which tear at high pressure.
- the connector comprises the fuel storage line in the region of the connection bore and has a thread.
- the thread is used to screw in a retaining nut, with which a line to be connected to the fuel storage line is biased in the direction of the fuel storage line. Since the connector includes the fuel storage line, the line can be biased against the fuel storage line with a relatively large force. For better fixation, it is provided to connect the connecting piece via a weld with the fuel storage line.
- the object of the invention is to provide an improved method for producing a fuel storage line and an improved fuel storage line.
- the hole is introduced into the fuel storage line only after the assembly of the connection piece.
- the connection piece may already have an opening in the region of the hole to be introduced.
- a bias on the fuel storage line from the outside has a positive effect on Ver GmbHs Siegen or cracking when inserting a hole in the fuel storage line.
- the connector is applied by a temporal expansion of the inner diameter of the connector or by a temporal shrinkage of the outer diameter of the fuel storage line.
- the expansion of the fitting and / or the shrinkage of the outer diameter of the fuel storage line are simple and common methods by which a fitting with bias can be mounted on the fuel storage line.
- the connector has a smaller inner diameter than the outer diameter of the fuel storage line under normal ambient conditions.
- the inner diameter of the fitting and / or the outer diameter of the fuel storage line again assumes the original size, so that the connecting piece exerts a radially directed to the center of the fuel storage line biasing force on the wall of the fuel storage line.
- an overall uniform distribution of the biasing force on the circumference of the fuel storage line is achieved.
- a fuel storage line which has at least two connection regions whose outer diameters are of different sizes.
- a first connection piece with a larger inner diameter can be slid over an outer connection area with a smaller outer diameter from one side. Only then, the first connection piece is pushed onto the second connection region by a lateral pressing-on process.
- a second connection piece is provided, which has a smaller inner diameter than the first connection piece and is likewise pushed onto the second connection region via a lateral pressing-on process.
- connection piece it is possible, without a shrinking or expansion process, to push a connection piece over a connection region to a further connection region and only apply the connection piece to the fuel storage line via a squeezing operation with a bias voltage in the further connection region.
- a connection region is produced by a compression of the fuel storage line.
- the compression increases the outer diameter of the fuel storage line.
- the compression offers additional advantages for the strength of the fuel storage line in the area of the connection area.
- the fuel storage line can be made by a full tube into which a cavity space is introduced through a longitudinal bore. Subsequently, an enlargement of the outer diameter of the fuel storage line is achieved by a compression of the fuel storage line in predetermined connection areas.
- a microstructural stress is generated in the compression area, which leads to an improved compressive strength and also the material thickness is increased in the region of the connection areas. A larger material thickness leads to increased pressure resistance.
- the increased compressive strength is somewhat reduced by the introduction of the hole, but overall is still sufficiently large to withstand the required high pressure ranges without damage.
- FIGS. Show it Fig. 1 a perspective view of a known fuel storage line with fittings, Fig. 2 a cross section through the known fuel storage line in the connection area, Fig. 3 a cross section through a further known embodiment of a connection area, Fig. 4 a third embodiment of a connection region of a known fuel storage line and Fig. 5 a cross section through a fuel storage line with connection areas having different outer diameters.
- the invention will be described below using the embodiment of a fuel storage line for an internal combustion engine, in particular for a diesel or gasoline-powered internal combustion engine.
- the invention is not limited to this embodiment, but can be used in any type of high pressure line to which lines are to be connected.
- Fig. 1 shows a perspective view of a known fuel storage line for an internal combustion engine.
- the fuel storage line 1 in this embodiment has a hollow cylindrical shape, which is closed in a first end region and is formed in a second end region for connecting a supply line.
- the supply line communicates with a fuel pump that delivers fuel from a tank to the fuel storage line.
- Common pressure ranges for fuel are in the range of direct injection gasoline internal combustion engines at 100 to 150 bar and diesel engines in the range from 1500 bar.
- the hollow cylindrical shape of the fuel storage line 1 is produced for example by the production of a full tube and a subsequent longitudinal bore of a cavity in the full tube. This embodiment has the advantage that one end of the hollow tube is closed in one piece with the wall of the hollow tube.
- a fuel storage line 1 has a plurality of connection regions 5, to which lines 6 are connected.
- the lines 6 are connected to injection valves which inject the fuel supplied from the fuel storage line via the line 6 into the internal combustion engine.
- a connection piece 2 is provided, which is of annular design and comprises the fuel storage line 1.
- a terminal screw 3 is screwed in the illustrated embodiment. The connecting pieces 2 are applied to the fuel storage line 1 in such a way that the connecting pieces 2 exert a bias in the direction of the wall of the fuel storage line 1.
- the bias voltage is generated, for example, by the outer diameter of the connection region 5 being greater than the inner diameter of the connection piece 2 before assembly.
- the connection piece 2 In order for the connection piece 2 to be applied to the connection region 5, either the inner diameter of the connection piece 2 is widened and / or the outer diameter of the connection area 5 reduced.
- An expansion of the inner diameter of the connecting piece 2 is achieved for example by an increase in temperature of the connecting piece 2.
- the connector 2 is usually made of a metallic material which expands as the temperature increases. Due to the expansion of the inner diameter of the connecting piece 2 is increased.
- a shrinkage of the outer diameter of the fuel storage line 1 in the region of the connection region 5 is achieved in that the fuel storage line 5, which is usually made of a metallic material, is cooled to a lower temperature than the ambient temperature. As a result of the cooling, the metallic material shrinks and the outer diameter of the fuel storage line decreases.
- connection piece 2 After arranging the connection piece 2 in the connection region 5, the connection piece 2 and / or the connection region 5 is brought back to ambient temperature. In this case, the inner diameter of the connecting piece 2 is reduced and / or the outer diameter of the connection region 5 increases. Thus, the connector 2 has a biasing force acting in the radial direction to the fuel storage line 1.
- the outer diameter of the connection region 5 is greater by a few percent than the inner diameter of the connection piece 2.
- the connection piece 2 is pushed onto the connection region 5 via a lateral crimping process. Due to the mechanical properties of the connecting piece 5, a widening of the inner diameter of the connecting piece 5 and / or a compression of the outer diameter of the fuel storage line is achieved, but preferably the yield point of the material of the connecting piece 2 is not reached.
- the widening of the inner diameter of the connecting piece 2 causes a bias of the connecting piece 2, which acts after completion of Aufquetschvorganges in the direction of the fuel storage line.
- Fig. 2 shows a cross section through a connection region 5 of the fuel storage line of Fig. 1
- the fuel storage line 1 is formed in the selected embodiment in the form of a hollow cylinder with a hollow volume 7.
- the wall of the fuel storage line 1 has a connection opening 8, which is guided by the hollow volume 7 to the outer surface of the fuel storage line 1.
- the connection opening 8 widens its cross-section and forms a sealing surface 9, which is annular in shape in the selected embodiment.
- On the sealing surface 9 is an associated sealing surface of the terminal screw 3.
- the terminal screw 3 has an external thread which is screwed to an internal thread of the connecting piece 2.
- the connecting piece 2 is formed in the direction of the line 4 with a larger material thickness.
- the larger material thickness has the advantage that a long internal thread can be formed. With the long internal thread, the terminal screw 3 can be pressed onto the sealing surface 9 with sufficient force without damaging the internal thread.
- the terminal screw 3 has a through hole, which is guided to a second end piece 10.
- the terminal screw 3 has an external thread, via which a line 4 via a union nut 11 is sealingly screwed against the terminal screw 3.
- the second end piece 10 has a further sealing surface 12, which is conical in this embodiment.
- the conduit 4 at the end associated with the second end piece 10 also has a conical outer sealing surface.
- Fig. 2A shows a cross section through a connecting piece 2. It can be clearly seen the circular inner diameter I, which is encompassed by the connecting piece 2. At the same time, the planar surface 13 can be seen, which is in the range of Connection opening 14 is arranged, through which the terminal screw 3 is guided in the mounted state.
- Fig. 2B shows a cross section through the fuel storage line 1 in the region of the connection bore. 8
- Fig. 3 shows a further embodiment of a known fuel storage line 1, wherein the connection opening 8 in the outer end region has a conical third sealing surface 15.
- the line 4 is guided directly to the third conical sealing surface 15.
- the line 4 in the end region, which is assigned to the fuel storage line 1 likewise has a conical outer sealing surface.
- the line 4 is screwed via an adjusting sleeve 16 and a second union nut 17 with the connector 2.
- the second union nut 17 has an external thread which is screwed to the internal thread of the connection piece 2.
- the adjusting sleeve 16 rests with a lower edge region on a flank 19 of the line 4.
- Fig. 4 shows a further embodiment of the known connection of a line 4 to a fuel storage line 1, wherein in this embodiment, the prestressed connector 2 has an external thread and a third union nut 18 is provided, which is screwed via an internal thread with the second connector 2. Also in this embodiment, an adjustment sleeve 16 is provided in order to achieve an optimal introduction of force to the line 4.
- Fig. 5 shows an inventive embodiment of a fuel storage line 1, the connection areas 5 having different outer diameters.
- the connection regions 5 are divided into two inner connection regions 5A and two outer connection regions 5B.
- the inner terminal areas 5A have a first outer diameter R1 and the outer terminal areas 5B have a second outer diameter R2.
- the first outer diameter R1 is greater than the second outer diameter R2.
- First terminal pieces 2A are applied to the inner terminal portions 5A, whose inner diameters are adapted to the outer diameters of the inner terminal portions 5A in such a manner that the first terminal pieces 2A are pushed laterally onto the inner terminal portions 5A via a crimping operation and then after the pushing-up operation with a bias voltage rest on the inner connection areas 5A.
- the outer terminal portions 5 B are associated with second connecting pieces 2 B, whose inner diameter are adapted to the outer diameters of the outer terminal portions 5 B in such a way that the connecting pieces 2 are pushed by a lateral Aufquetschvorgang from the outside to the outer terminal portions 5 B and after the Aufschiebevorgang with a bias on the outer terminal areas 5B rest.
- the inner diameters of the first terminals 2A are formed in such a manner that the first terminals 2A can be pushed over the outer terminal area 5B to the inner terminal area 5A without a squeezing operation. In this way, it is possible to apply fittings even with more than two terminal areas via a simple lateral Aufquetschvorgang with a bias to inner terminal areas.
- connection piece 2 or of the connection region 5 it is not necessary to carry out a temporal widening and / or a temporal shrinkage of the connection piece 2 or of the connection region 5.
- the embodiment of the Fig. 5 shows four connections, but also a plurality of connections can be represented by a corresponding adjustment of the outer diameter of the connection areas 5 and the inner diameter of the connecting pieces 2.
- connection areas In another manufacturing method, fittings and connection areas have almost the same inner and outer diameters. This allows connecting pieces to be pushed onto the connection areas without any problems. Subsequently, the outer diameter of the connection areas is increased by a compression process. As a result, a bias voltage is generated in the connector, which acts on the fuel storage line. A compression is generated for example in that the connection areas have a stepped enlarged diameter relative to the fuel storage line ( Fig. 5 ). On the stepped side surface 21, two tools 22 can attack, which compress the connection area.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
- Branch Pipes, Bends, And The Like (AREA)
Description
Die Erfindung betrifft ein Verfahren zum Herstellen einer Kraftstoffspeicherleitung gemäß dem Oberbegriff des Patentanspruchs 1 und eine Kraftstoffspeicherleitung gemäß dem Oberbegriff des Patentanspruchs 6.The invention relates to a method for producing a fuel storage line according to the preamble of patent claim 1 and a fuel storage line according to the preamble of patent claim 6.
Kraftstoffspeicherleitungen werden im Bereich der Kraftfahrzeugtechnik zum Aufbau eines Common-Rail-Einspritzsystems eingesetzt. Dabei dient die Kraftstoffspeicherleitung als Vorratsvolumen, in dem ein Kraftstoff mit einem relativ hohen Druck bereitgehalten wird. Der Kraftstoff wird über zugeordnete Einspritzventile aus der Kraftstoffspeicherleitung in den Brennraum der Brennkraftmaschine abgegeben. Eine Anwendung der Kraftstoffspeicherleitung findet sich sowohl bei direkt einspritzenden Benzin- als auch direkt einspritzenden Dieselbrennkraftmaschinen.Fuel storage lines are used in the field of automotive technology to build a common rail injection system. In this case, the fuel storage line serves as a storage volume in which a fuel is kept at a relatively high pressure. The fuel is discharged via associated injection valves from the fuel storage line into the combustion chamber of the internal combustion engine. One application of the fuel storage line is in both direct injection gasoline and direct injection diesel engines.
Für eine präzise und effiziente Einspritzung ist insbesondere bei Dieselkraftstoff ein sehr hoher Druck in der Kraftstoffspeicherleitung wünschenswert. Mittlerweile werden Drücke von 1500 bis 2000 bar erreicht. Dieser Druckbereich stellt besonders hohe Anforderungen an die Qualität der Kraftstoffspeicherleitung. Insbesondere ist der Anschluss einer Leitung an die Kraftstoffspeicherleitung eine kritische Funktion, die einen großen.Einfluss auf die Qualität der Kraftstoffspeicherleitung hat. Ein Anschluss einer Leitung erfordert ein Loch in der Wandung der Kraftstoffspeicherleitung. Eine Wandung mit Loch weist den Nachteil auf, dass sich Risse im Bereich des Loches bilden, die bei hohem Druck aufreißen. Zudem ist es erforderlich, die Leitung mit großem Druck an die Kraftstoffspeicherleitung zu pressen, um gegen die hohen Drücke abzudichten.For a precise and efficient injection, especially for diesel fuel, a very high pressure in the fuel storage line is desirable. Meanwhile, pressures of 1500 to 2000 bar are reached. This pressure range places particularly high demands on the quality of the fuel storage line. In particular, the connection of a line to the fuel storage line is a critical function that has a major influence on the quality of the fuel storage line. Connection of a pipe requires a hole in the wall of the fuel storage pipe. A wall with a hole has the disadvantage that cracks form in the area of the hole, which tear at high pressure. In addition, it is necessary to press the line at high pressure to the fuel storage line to seal against the high pressures.
Zum Anschluss einer Leitung an die Kraftstoffspeicherleitung ist es beispielsweise aus
Eine aus
Die Aufgabe der Erfindung besteht darin, ein verbessertes Verfahren zur Herstellung einer Kraftstoffspeicherleitung und eine verbesserte Kraftstoffspeicherleitung bereitzustellen.The object of the invention is to provide an improved method for producing a fuel storage line and an improved fuel storage line.
Die Aufgabe der Erfindung wird durch die Merkmale des Anspruchs 1 und durch die Merkmale des Anspruchs 6 gelöst.The object of the invention is achieved by the features of claim 1 and by the features of claim 6.
In einer weiteren vorteilhaften Ausgestaltung des Verfahrens wird das Loch in die Kraftstoffspeicherleitung erst nach der Montage des Anschlussstückes eingebracht. Dabei kann das Anschlussstück schon eine Öffnung im Bereich des einzubringenden Loches aufweisen. Jedoch ist es auch möglich, erst in das montierte Anschlussstück eine Öffnung einzubringen. Auf diese Weise wird eine verbesserte Vorgehensweise beim Einbringen des Loches in die Kraftstoffspeicherleitung bereitgestellt. Eine Vorspannung auf die Kraftstoffspeicherleitung von außen wirkt sich positiv gegenüber Versetzungsbildungen oder Rissbildungen beim Einbringen eines Loches in die Kraftstoffspeicherleitung aus.In a further advantageous embodiment of the method, the hole is introduced into the fuel storage line only after the assembly of the connection piece. In this case, the connection piece may already have an opening in the region of the hole to be introduced. However, it is also possible to introduce an opening only in the assembled connector. In this way, an improved approach to the introduction of the hole in the fuel storage line is provided. A bias on the fuel storage line from the outside has a positive effect on Versetzungsbildungen or cracking when inserting a hole in the fuel storage line.
In einfachen Ausführungsformen des aus
In einer erfindungsgemässen Ausführungsform wird eine Kraftstoffspeicherleitung verwendet, die mindestens zwei Anschlussbereiche aufweist, deren Außendurchmesser unterschiedlich groß sind. Auf diese Weise kann von einer Seite ein erstes Anschlussstück mit einem größeren Innendurchmesser über einen äußeren Anschlussbereich mit einem kleineren Außendurchmesser aufgeschoben werden. Erst anschließend wird durch einen seitlichen Aufpressvorgang das erste Anschlussstück auf den zweiten Anschlussbereich aufgeschoben. Für den zweiten Anschlussbereich ist ein zweites Anschlussstück vorgesehen, das gegenüber dem ersten Anschlussstück einen kleineren Innendurchmesser aufweist und ebenfalls über einen seitlichen Aufpressvorgang auf den zweiten Anschlussbereich aufgeschoben wird. Auf diese Weise ist es möglich, ohne einen Schrumpf- oder Aufweitvorgang ein Anschlussstück über einen Anschlussbereich zu einem weiteren Anschlussbereich zu schieben und erst bei dem weiteren Anschlussbereich das Anschlussstück über einen Quetschvorgang mit einer Vorspannung auf die Kraftstoffspeicherleitung aufzubringen.In an embodiment according to the invention, a fuel storage line is used which has at least two connection regions whose outer diameters are of different sizes. In this way, a first connection piece with a larger inner diameter can be slid over an outer connection area with a smaller outer diameter from one side. Only then, the first connection piece is pushed onto the second connection region by a lateral pressing-on process. For the second connection region, a second connection piece is provided, which has a smaller inner diameter than the first connection piece and is likewise pushed onto the second connection region via a lateral pressing-on process. In this way it is possible, without a shrinking or expansion process, to push a connection piece over a connection region to a further connection region and only apply the connection piece to the fuel storage line via a squeezing operation with a bias voltage in the further connection region.
In einer weiteren Ausführungsform wird ein Anschlussbereich durch eine Stauchung der Kraftstoffspeicherleitung hergestellt. Durch die Stauchung wird der Außendurchmesser der Kraftstoffspeicherleitung vergrößert. Die Stauchung bietet zusätzliche Vorteile für die Festigkeit der Kraftstoffspeicherleitung im Bereich des Anschlussbereiches. Beispielsweise kann die Kraftstoffspeicherleitung durch ein Vollrohr hergestellt werden, in das durch eine Längsbohrung ein Höhlraum eingebracht wird. Anschließend wird durch eine Stauchung der Kraftstoffspeicherleitung in vorgegebenen Anschlussbereichen eine Vergrößerung des Außendurchmessers der Kraftstoffspeicherleitung erreicht. Somit wird eine Gefügespannung im Stauchbereich erzeugt, die zu einer verbesserten Druckfestigkeit führt und zudem wird die Materialdicke im Bereich der Anschlussbereiche erhöht. Eine größere Materialdicke führt zu einer erhöhten Druckfestigkeit. Die erhöhte Druckfestigkeit wird zwar durch die Einbringung des Loches wieder etwas erniedrigt, ist aber insgesamt noch ausreichend groß, um den erforderlichen hohen Druckbereichen ohne eine Beschädigung standzuhalten.In a further embodiment, a connection region is produced by a compression of the fuel storage line. The compression increases the outer diameter of the fuel storage line. The compression offers additional advantages for the strength of the fuel storage line in the area of the connection area. For example, the fuel storage line can be made by a full tube into which a cavity space is introduced through a longitudinal bore. Subsequently, an enlargement of the outer diameter of the fuel storage line is achieved by a compression of the fuel storage line in predetermined connection areas. Thus, a microstructural stress is generated in the compression area, which leads to an improved compressive strength and also the material thickness is increased in the region of the connection areas. A larger material thickness leads to increased pressure resistance. Although the increased compressive strength is somewhat reduced by the introduction of the hole, but overall is still sufficiently large to withstand the required high pressure ranges without damage.
Die Erfindung wird im Folgenden anhand der Figuren näher erläutert. Es zeigen
Die Erfindung wird im Folgenden am Ausführungsbeispiel einer Kraftstoffspeicherleitung für eine Brennkraftmaschine, insbesondere für eine diesel- oder benzinbetriebene Brennkraftmaschine beschrieben. Die Erfindung ist jedoch nicht auf dieses Ausführungsbeispiel beschränkt, sondern bei jeder Art von Hochdruckleitung einsetzbar, an denen Leitungen anzuschließen sind.The invention will be described below using the embodiment of a fuel storage line for an internal combustion engine, in particular for a diesel or gasoline-powered internal combustion engine. However, the invention is not limited to this embodiment, but can be used in any type of high pressure line to which lines are to be connected.
Die Vorspannung wird beispielsweise dadurch erzeugt, dass vor der Montage der Außendurchmesser des Anschlussbereiches 5 größer ist als der Innendurchmesser des Anschlussstückes 2. Damit das Anschlussstück 2 auf den Anschlussbereich 5 aufgebracht werden kann, wird entweder der Innendurchmesser des Anschlussstückes 2 aufgeweitet und/oder der Außendurchmesser des Anschlussbereiches 5 verkleinert. Eine Aufweitung des Innendurchmessers des Anschlussstückes 2 wird beispielsweise durch eine Temperaturerhöhung des Anschlussstücks 2 erreicht. Das Anschlussstück 2 ist üblicherweise aus einem metallischen Material gefertigt, das bei zunehmender Temperatur sich ausdehnt. Durch die Ausdehnung wird auch der Innendurchmesser des Anschlussstückes 2 vergrößert. Eine Schrumpfung des Außendurchmessers der Kraftstoffspeicherleitung 1 im Bereich des Anschlussbereiches 5 wird dadurch erreicht, dass die Kraftstoffspeicherleitung 5, die üblicherweise aus einem metallischen Material gefertigt ist, auf eine niedrigere Temperatur als die Umgebungstemperatur abgekühlt wird. Durch die Abkühlung schrumpft das metallische Material und der Außendurchmesser der Kraftstoffspeicherleitung nimmt ab.The bias voltage is generated, for example, by the outer diameter of the connection region 5 being greater than the inner diameter of the
Die Aufweitung und/oder die Schrumpfung wird so weit durchgeführt, bis das Anschlussstück 2 auf den Anschlussbereich 5 aufgeschoben werden kann. Nach dem Anordnen des Anschlussstücks 2 im Anschlussbereich 5 wird das Anschlussstück 2 und/oder der Anschlussbereich 5 wieder auf Umgebungstemperatur gebracht. Dabei reduziert sich der Innendurchmesser des Anschlussstückes 2 und/oder der Außendurchmesser des Anschlussbereiches 5 vergrößert sich. Somit weist das Anschlussstück 2 eine Vorspannkraft auf, die in radialer Richtung zur Kraftstoffspeicherleitung 1 wirkt.The expansion and / or the shrinkage is carried out until the
In einem weiteren Herstellungsverfahren ist der Außendurchmesser des Anschlussbereiches 5 um einige Prozent größer als der Innendurchmesser des Anschlussstückes 2. Das Anschlussstück 2 wird über einen seitlichen Aufquetschvorgang auf den Anschlussbereich 5 aufgeschoben. Dabei wird aufgrund der mechanischen Eigenschaften des Anschlussstückes 5 eine Aufweitung des Innendurchmessers des Anschlussstückes 5 und/oder eine Stauchung des Außendurchmessers der Kraftstoffspeicherleitung erreicht, wobei jedoch vorzugsweise die Fließgrenze des Materials des Anschlussstückes 2 nicht erreicht wird. Die Aufweitung des Innendurchmessers des Anschlussstückes 2 bewirkt eine Vorspannung des Anschlussstückes 2, die nach Beendigung des Aufquetschvorganges in Richtung auf die Kraftstoffspeicherleitung wirkt.In a further production method, the outer diameter of the connection region 5 is greater by a few percent than the inner diameter of the
Die Anschlussschraube 3 weist eine durchgehende Bohrung auf, die zu einem zweiten Endstück 10 geführt ist. Am zweiten Endstück 10 weist die Anschlussschraube 3 ein Außengewinde auf, über das eine Leitung 4 über eine Überwurfmutter 11 dichtend gegen die Anschlussschraube 3 verschraubbar ist. Dazu weist das zweite Endstück 10 eine weitere Dichtfläche 12 auf, die in diesem Ausführungsbeispiel konisch ausgebildet ist. Vorzugsweise weist die Leitung 4 an dem Ende, das dem zweiten Endstück 10 zugeordnet ist, ebenfalls eine konische Außendichtfläche auf. Durch eine Verschraubung der Leitung 4 mit der Anschlussschraube 3 wird eine dichtende Leitungsverbindung zwischen der Leitung 4 und der Anschlussschraube 3 hergestellt. Das Anschlussstück 2 weist vorzugsweise eine plane Oberfläche auf, die senkrecht zur Längsrichtung der Anschlussschraube 3 ausgerichtet ist.The
Den äußeren Anschlussbereichen 5B sind zweite Anschlussstücke 2B zugeordnet, deren Innendurchmesser den Außendurchmessern der äußeren Anschlussbereiche 5B in der Weise angepasst sind, dass die Anschlussstücke 2 durch einen seitlichen Aufquetschvorgang von außen auf die äußeren Anschlussbereiche 5B aufschiebbar sind und nach dem Aufschiebevorgang mit einer Vorspannung auf den äußeren Anschlussbereichen 5B aufliegen. Die Innendurchmesser der ersten Anschlussstücke 2A sind in der Weise ausgebildet, dass die ersten Anschlussstücke 2A ohne einen Quetschvorgang über den äußeren Anschlussbereich 5B zum inneren Anschlussbereich 5A geschoben werden können. Auf diese Weise ist es möglich, Anschlussstücke auch bei mehr als zwei Anschlussbereichen über einen einfachen seitlichen Aufquetschvorgang mit einer Vorspannung auf innere Anschlussbereiche aufzubringen. In dieser Ausführungsform ist es nicht erforderlich, eine zeitliche Aufweitung und/oder eine zeitliche Schrumpfung des Anschlussstückes 2 bzw. des Anschlussbereiches 5 durchzuführen. Damit ist die Ausführung der Kraftstoffspeicherleitung 1 und der Anschlussstücke 2 nicht auf Materialien beschränkt, die zeitlich aufgeweitet oder eingeschrumpft werden können. Zudem werden auf diese Weise Nachteile, die durch eine Aufweitung und/oder eine Schrumpfung verursacht werden, vermieden.The outer
Die Ausführungsform der
In einem weiteren Herstellungsverfahren weisen Anschlussstücke und Anschlussbereiche nahezu gleich große Innen- bzw. Außendurchmesser auf. So können Anschlussstücke ohne Probleme auf die Anschlussbereiche geschoben werden. Anschließend wird der Außendurchmesser der Anschlussbereiche durch einen Stauchvorgang vergrößert. Dadurch wird im Anschlussstück eine Vorspannung erzeugt, die auf die Kraftstoffspeicherleitung einwirkt. Eine Stauchung wird beispielsweise dadurch erzeugt, dass die Anschlussbereiche einen stufig vergrößerten Durchmesser gegenüber der Kraftstoffspeicherleitung aufweisen (
Claims (6)
- Method for producing a fuel accumulator line (1) for an internal-combustion engine with at least one hole (8) being made in the wall of the fuel accumulator line (1) in a connecting area (5), with a connecting piece (2) being mounted onto the connecting area (5) with prestress, and with the inside diameter (I) of the connecting piece (2) being less than the outside diameter of the connecting area (5), characterised in that the connecting piece (2) presses onto the connecting area (5) via a lateral pressing-on process,
- Method according to claim 1, characterised in that the hole is only mounted after the connecting piece (2) has been mounted onto the fuel accumulator line (1).
- Method according to one of the claims 1 or 2, characterised in that in the area of the hole, a sealing surface (9, 12, 15) for connecting a line (4) is embodied on the wall of the fuel accumulator line (1).
- Method according to one of the claims 1 to 3, characterised in that at least two connecting pieces (2A, 2B) are pressed onto two connecting areas (5A, 5B),
that the inside diameters of the two connecting pieces (2A, 2B) differ in size,
that the outside diameters of the two connecting areas (5A, 5B) differ in size,
that the inside diameter of a second connecting piece (2B) is less than the outside diameter of the allocated inner connecting area (5B),
that the inside diameter of the first connecting piece (2A) exceeds the outside diameter of the outer connecting area (5B), and
that the two connecting pieces (2A, 2B) are pressed onto the allocated connecting areas via lateral pressing-on processes. - Method according to one of the claims 1 to 4, characterised in that in the connecting area (5A, 5B) the outside diameter increases because of a compression process.
- Fuel accumulator line (1) with a connecting piece (2) for connecting a line (4),
with the connecting piece (2) being arranged in a connecting area (5) of the fuel accumulator line (1),
with a connecting opening (8) being made in the fuel accumulator line (1) in the connecting area (5),
and with the connecting piece (2) having a prestress in the direction of the fuel accumulator line (1),
characterised in that
at least two connecting areas (5A, 5B) are provided of which (5A, 5B) at least some have different outside diameters.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10154645A DE10154645A1 (en) | 2001-11-07 | 2001-11-07 | Method for producing a fuel storage line with a prestressed connector |
DE10154645 | 2001-11-07 | ||
PCT/DE2002/004114 WO2003040547A1 (en) | 2001-11-07 | 2002-11-06 | Method for producing a fuel accumulator line comprising a prestressed connection piece |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1442211A1 EP1442211A1 (en) | 2004-08-04 |
EP1442211B1 true EP1442211B1 (en) | 2009-01-21 |
Family
ID=7704892
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02776874A Expired - Lifetime EP1442211B1 (en) | 2001-11-07 | 2002-11-06 | Method for producing a fuel accumulator line comprising a prestressed connection piece |
Country Status (6)
Country | Link |
---|---|
US (1) | US7213577B2 (en) |
EP (1) | EP1442211B1 (en) |
JP (1) | JP2005508478A (en) |
DE (2) | DE10154645A1 (en) |
HU (1) | HU228720B1 (en) |
WO (1) | WO2003040547A1 (en) |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005140058A (en) | 2003-11-07 | 2005-06-02 | Denso Corp | Common-rail |
DE10360534B4 (en) * | 2003-12-22 | 2007-06-06 | Siemens Ag | High-pressure fuel pump for common-rail injection systems |
WO2007015566A1 (en) * | 2005-08-04 | 2007-02-08 | Nippon Steel Corporation | High-pressure fuel injection accumulator distributor for automobile and method of manufacturing the same |
JP4651030B2 (en) * | 2006-05-31 | 2011-03-16 | 本田技研工業株式会社 | Fuel supply device |
DE102006034171A1 (en) * | 2006-07-24 | 2008-01-31 | Siemens Ag | Drilling arrangement has small drilling and large drilling and supporting structure is formed by hollow body brought into small hole drilling |
JP2008095629A (en) * | 2006-10-13 | 2008-04-24 | Bosch Corp | Common rail |
DE102007018471A1 (en) * | 2007-04-19 | 2008-10-23 | Robert Bosch Gmbh | Intersection between a high pressure chamber and a high pressure channel |
DE102008007904B4 (en) * | 2008-02-06 | 2013-01-31 | Hugo Kern Und Liebers Gmbh & Co. Kg Platinen- Und Federnfabrik | Device for connecting an injector line to a high-pressure pipe |
DE102009051065B3 (en) * | 2009-10-28 | 2011-01-20 | Benteler Automobiltechnik Gmbh | Fuel distributor |
AT509177B1 (en) * | 2009-11-23 | 2013-09-15 | Bosch Gmbh Robert | PRESSURE TUBE FITTINGS FOR COMMON RAIL INJECTION SYSTEM |
EP2392816B1 (en) * | 2010-06-03 | 2013-10-09 | Delphi Technologies Holding S.à.r.l. | Stress Relief in Pressurized Fluid Flow System |
CN104514937A (en) * | 2013-09-30 | 2015-04-15 | 武汉市无穷大能源科技有限公司 | Expansion joint of multi-way pipeline |
JP6382665B2 (en) * | 2014-09-26 | 2018-08-29 | 臼井国際産業株式会社 | Delivery pipe for gasoline |
DE102017104608B4 (en) * | 2017-03-06 | 2022-12-29 | Gkn Powder Metallurgy Engineering Gmbh | Pipe section of a common rail pipe and method for its manufacture |
EP3470663B1 (en) * | 2017-10-12 | 2022-08-31 | Vitesco Technologies GmbH | A fuel rail assembly for a fuel injection system for an internal combustion engine |
JP7337725B2 (en) * | 2020-02-14 | 2023-09-04 | 臼井国際産業株式会社 | Fuel pressure sensor connection structure |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63185988U (en) | 1987-05-23 | 1988-11-29 | ||
JP2898384B2 (en) * | 1989-09-27 | 1999-05-31 | 臼井国際産業株式会社 | Connection structure of branch connector in high-pressure fuel rail |
JP2803383B2 (en) * | 1991-04-08 | 1998-09-24 | トヨタ自動車株式会社 | High pressure fluid fittings |
US6062263A (en) * | 1997-01-17 | 2000-05-16 | Textron Inc. | Thread-forming pipe plug |
US6126208A (en) * | 1997-03-03 | 2000-10-03 | Usui Kokusai Sangyo Kaisha Limited | Common rail and method of manufacturing the same |
CA2230744A1 (en) * | 1997-03-03 | 1998-09-03 | Usui Kokusai Sangyo Kaisha Limited | Common rail and method of manufacturing the same |
US6325108B1 (en) * | 1999-06-21 | 2001-12-04 | David S. Bettinger | Prestressed composite cryogenic piping |
DE19936535A1 (en) * | 1999-08-03 | 2001-02-15 | Bosch Gmbh Robert | High pressure fuel accumulator |
DE19948341A1 (en) * | 1999-10-07 | 2001-04-19 | Bosch Gmbh Robert | High pressure fuel accumulator |
DE19948338A1 (en) * | 1999-10-07 | 2001-04-12 | Bosch Gmbh Robert | Process for processing a high-pressure fuel accumulator, high-pressure fuel accumulator and connecting piece for using the method |
JP4107629B2 (en) * | 2000-02-07 | 2008-06-25 | 株式会社オティックス | Manufacturing method of common rail |
-
2001
- 2001-11-07 DE DE10154645A patent/DE10154645A1/en not_active Withdrawn
-
2002
- 2002-11-06 HU HU0401960A patent/HU228720B1/en not_active IP Right Cessation
- 2002-11-06 WO PCT/DE2002/004114 patent/WO2003040547A1/en active Application Filing
- 2002-11-06 JP JP2003542776A patent/JP2005508478A/en active Pending
- 2002-11-06 DE DE50213243T patent/DE50213243D1/en not_active Expired - Lifetime
- 2002-11-06 EP EP02776874A patent/EP1442211B1/en not_active Expired - Lifetime
-
2004
- 2004-05-06 US US10/840,565 patent/US7213577B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
HU228720B1 (en) | 2013-05-28 |
HUP0401960A2 (en) | 2005-01-28 |
DE10154645A1 (en) | 2003-06-12 |
JP2005508478A (en) | 2005-03-31 |
US7213577B2 (en) | 2007-05-08 |
WO2003040547A1 (en) | 2003-05-15 |
EP1442211A1 (en) | 2004-08-04 |
DE50213243D1 (en) | 2009-03-12 |
US20040206336A1 (en) | 2004-10-21 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP1442211B1 (en) | Method for producing a fuel accumulator line comprising a prestressed connection piece | |
EP2203639B1 (en) | Fuel injection device | |
DE19511063C2 (en) | Pipe connection with a pipe with a connecting section and method for producing the same | |
EP1774217B1 (en) | Connection for high-pressure media conduits | |
DE19937444C1 (en) | Fuel distribution device for i.c. engine fuel injection system has fuel injection valves fitted directly to fuel distribution line via connection elements fitted to fuel distribution openings along fuel distribution line | |
EP3245433B1 (en) | Connection arrangement for establishing a hydraulic connection | |
WO2009021951A1 (en) | Housing arrangement for a stationary flow machine | |
DE10256668A1 (en) | support element | |
DE10340911B4 (en) | Adapter sleeve with temperature compensation | |
DE19531743C1 (en) | Pressure tester for e.g. fuel injection pipe | |
DE102020202949A1 (en) | Fuel injector | |
EP2592260B1 (en) | Fuel injector, method for the assembly of a fuel injector and tensioning device for mounting of a fuel injector | |
DE29521617U1 (en) | Pipe with a connection section and pipe connection | |
DE202008004065U1 (en) | High pressure seal | |
DE102006049202A1 (en) | Sealing system for fuel injection device of common rail diesel internal-combustion engine, has casing protruding from recess in partly assembled condition, rests on surface of components, and deformed such that surfaces contact each other | |
EP0999361B1 (en) | Device with junction of drilled holes | |
DE102019131537B4 (en) | Device for pressure regulation in a fuel supply of an internal combustion engine with a common rail injection | |
DE102004036518B4 (en) | Torsion-proof sealing cone connection in injection lines for fuel injection and method for their production | |
EP2301121B1 (en) | Installation space-optimized spark plug | |
DE102005029471B4 (en) | Method for producing a hollow cylindrical spring | |
DE102022211054A1 (en) | Fuel injector arrangement for mounting a fuel injector in an internal combustion engine | |
DE102005051005A1 (en) | Fuel injection valve for internal combustion engine has inflow-side end of valve housing in form of long connection shell deformable by radial forces | |
DE20320869U1 (en) | Fuel injection valve has clamp nut opening internal diameter corresponding essentially to external diameter of second cylindrical section of valve body with peripheral groove in transition from second cylindrical section to contact surface | |
DE102022208848A1 (en) | Spark plug with improved sealing properties | |
DE10249142A1 (en) | Connector for the pressure fuel pipe at the fuel injector, at an IC motor, has a ring collar at the outflow end which is distorted to press against a cut-back section in the sealing disk |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20040226 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: CONTINENTAL AUTOMOTIVE GMBH |
|
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): DE FR GB IT |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: FG4D Free format text: NOT ENGLISH |
|
REF | Corresponds to: |
Ref document number: 50213243 Country of ref document: DE Date of ref document: 20090312 Kind code of ref document: P |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed |
Effective date: 20091022 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20091106 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20091106 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20090121 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20121130 Year of fee payment: 11 Ref country code: FR Payment date: 20121130 Year of fee payment: 11 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST Effective date: 20140731 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R119 Ref document number: 50213243 Country of ref document: DE Effective date: 20140603 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20140603 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20131202 |