EP1442211B1 - Procede pour produire une conduite de reservoir de carburant comprenant une piece de raccordement precontrainte - Google Patents

Procede pour produire une conduite de reservoir de carburant comprenant une piece de raccordement precontrainte Download PDF

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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 - Fee Related
Application number
EP02776874A
Other languages
German (de)
English (en)
Other versions
EP1442211A1 (fr
Inventor
Helmut Hummel
Georg Weigl
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.)
Continental Automotive GmbH
Original Assignee
Continental Automotive 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 Continental Automotive GmbH filed Critical Continental Automotive GmbH
Publication of EP1442211A1 publication Critical patent/EP1442211A1/fr
Application granted granted Critical
Publication of EP1442211B1 publication Critical patent/EP1442211B1/fr
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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
    • 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.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Branch Pipes, Bends, And The Like (AREA)

Claims (6)

  1. Procédé de fabrication d'une conduite de réservoir de carburant (1) pour un moteur à combustion interne, au moins un trou (8) étant mis en place dans la paroi de la conduite de réservoir de carburant (1) dans une zone de raccordement (5), une pièce de raccordement (2) étant appliquée avec précontrainte sur la zone de raccordement (5), et
    le diamètre intérieur (I) de la pièce de raccordement (2) étant inférieur au diamètre extérieur de la zone de raccordement (5), caractérisé en ce que la pièce de raccordement (2) est engagée par pression sur la zone de raccordement (5) par l'opération d'engagement par pression latéral.
  2. Procédé selon la revendication 1, caractérisé en ce que le trou est mis en place dans la conduite de réservoir de carburant (1) seulement après le montage de la pièce de raccordement (2).
  3. Procédé selon l'une quelconque des revendications 1 ou 2, caractérisé en ce qu'une face d'étanchéité (9, 12, 15) est réalisée au niveau de la paroi de la conduite de réservoir de carburant (1) dans la zone du trou, permettant le raccordement d'une conduite (4).
  4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce qu'au moins deux pièces de raccordement (2A, 2B) sont engagées par pression sur deux zones de raccordement (5A, 5B),
    en ce que les diamètres intérieurs des deux pièces de raccordement (2A, 2B) sont de taille différente,
    en ce que les diamètres extérieurs des deux zones de raccordement (5A, 5B) sont de taille différente,
    en ce que le diamètre intérieur d'une deuxième pièce de raccordement (2B) est inférieur au diamètre extérieur de la zone de raccordement intérieure (5B) associée,
    en ce que le diamètre intérieur de la première pièce de raccordement (2A) est supérieur au diamètre extérieur de la zone de raccordement extérieur (5B), et
    en ce que les deux pièces de raccordement (2A, 2B) sont engagées par pression sur les zones de raccordement associées par des opérations d'engagement par pression latéral.
  5. Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce qu'un agrandissement du diamètre extérieur est généré par une opération de refoulement dans la zone de raccordement (5A, 5B).
  6. Conduite de réservoir de carburant (1) dotée d'une pièce de raccordement (2) permettant de raccorder une conduite (4),
    la pièce de raccordement (2) étant disposée dans une zone de raccordement (5) de la conduite de réservoir de carburant (1), une ouverture de raccordement (8) étant mise en place dans la conduite de réservoir de carburant (1) dans la zone de raccordement (5), et la pièce de raccordement (2) présentant une précontrainte en direction de la conduite de réservoir de carburant (1),
    caractérisée en ce
    qu'au moins deux zones de raccordement (5A, 5B) sont prévues, parmi lesquelles (5A, 5B) au moins une partie présente des diamètres extérieurs différents.
EP02776874A 2001-11-07 2002-11-06 Procede pour produire une conduite de reservoir de carburant comprenant une piece de raccordement precontrainte Expired - Fee Related EP1442211B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10154645A DE10154645A1 (de) 2001-11-07 2001-11-07 Verfahren zum Herstellen einer Kraftstoffspeicherleitung mit einem vorgespannten Anschlussstück
DE10154645 2001-11-07
PCT/DE2002/004114 WO2003040547A1 (fr) 2001-11-07 2002-11-06 Procede pour produire une conduite de reservoir de carburant comprenant une piece de raccordement precontrainte

Publications (2)

Publication Number Publication Date
EP1442211A1 EP1442211A1 (fr) 2004-08-04
EP1442211B1 true EP1442211B1 (fr) 2009-01-21

Family

ID=7704892

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Application Number Title Priority Date Filing Date
EP02776874A Expired - Fee Related EP1442211B1 (fr) 2001-11-07 2002-11-06 Procede pour produire une conduite de reservoir de carburant comprenant une piece de raccordement precontrainte

Country Status (6)

Country Link
US (1) US7213577B2 (fr)
EP (1) EP1442211B1 (fr)
JP (1) JP2005508478A (fr)
DE (2) DE10154645A1 (fr)
HU (1) HU228720B1 (fr)
WO (1) WO2003040547A1 (fr)

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WO2007015566A1 (fr) * 2005-08-04 2007-02-08 Nippon Steel Corporation Distributeur d’allumage accumulateur à injection à haute pression pour automobile et son procédé de fabrication
JP4651030B2 (ja) * 2006-05-31 2011-03-16 本田技研工業株式会社 燃料供給装置
DE102006034171A1 (de) * 2006-07-24 2008-01-31 Siemens Ag Bohrungsanordnung
JP2008095629A (ja) * 2006-10-13 2008-04-24 Bosch Corp コモンレール
DE102007018471A1 (de) * 2007-04-19 2008-10-23 Robert Bosch Gmbh Verschneidungsbereich zwischen einer Hochdruckkammer und einem Hochdruckkanal
DE102008007904B4 (de) * 2008-02-06 2013-01-31 Hugo Kern Und Liebers Gmbh & Co. Kg Platinen- Und Federnfabrik Vorrichtung zur Verbindung einer Injektorleitung mit einem Hochdruckrohr
DE102009051065B3 (de) * 2009-10-28 2011-01-20 Benteler Automobiltechnik Gmbh Kraftstoffverteiler
AT509177B1 (de) * 2009-11-23 2013-09-15 Bosch Gmbh Robert Druckrohrstutzen für common-rail-einspritzsystem
EP2392816B1 (fr) * 2010-06-03 2013-10-09 Delphi Technologies Holding S.à.r.l. Détente d'un système d'écoulement fluidique pressurisé
CN104514937A (zh) * 2013-09-30 2015-04-15 武汉市无穷大能源科技有限公司 一种多通管道伸缩接头
JP6382665B2 (ja) 2014-09-26 2018-08-29 臼井国際産業株式会社 ガソリン用デリバリパイプ
DE102017104608B4 (de) * 2017-03-06 2022-12-29 Gkn Powder Metallurgy Engineering Gmbh Rohrleitungsabschnitt einer Common-Rail-Leitung und Verfahren zu dessen Herstellung
EP3470663B1 (fr) * 2017-10-12 2022-08-31 Vitesco Technologies GmbH Ensemble rampe de carburant pour un système d'injection de carburant d'un moteur à combustion interne

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Also Published As

Publication number Publication date
DE10154645A1 (de) 2003-06-12
WO2003040547A1 (fr) 2003-05-15
JP2005508478A (ja) 2005-03-31
HU228720B1 (en) 2013-05-28
US7213577B2 (en) 2007-05-08
EP1442211A1 (fr) 2004-08-04
US20040206336A1 (en) 2004-10-21
HUP0401960A2 (hu) 2005-01-28
DE50213243D1 (de) 2009-03-12

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