EP1442211A1 - 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 pieceInfo
- Publication number
- EP1442211A1 EP1442211A1 EP02776874A EP02776874A EP1442211A1 EP 1442211 A1 EP1442211 A1 EP 1442211A1 EP 02776874 A EP02776874 A EP 02776874A EP 02776874 A EP02776874 A EP 02776874A EP 1442211 A1 EP1442211 A1 EP 1442211A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- connection
- fuel storage
- storage line
- line
- connection piece
- 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
Links
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 8.
- Fuel storage lines are used in the field of automotive engineering to build a common rail injection system.
- the fuel storage line serves as
- Storage volume in which a fuel with a relatively high pressure is kept ready.
- the fuel is discharged from the fuel storage line into the combustion chamber of the internal combustion engine via associated injection valves.
- the fuel storage line is used in both direct-injection gasoline and direct-injection diesel engines.
- a very high pressure in the fuel storage line is desirable, especially with diesel fuel. Pressures of 1500 to 2000 bar are now being reached. This pressure range places particularly high demands on the quality of the fuel storage line.
- 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. Connecting a line requires a hole in the wall of the fuel storage line. A wall with a hole has the disadvantage that cracks form in the area of the hole, which tear open at high pressure. It is also necessary to press the line against the fuel storage line at high pressure in order to seal against the high pressures.
- connection piece For connecting a line to the fuel storage line, it is known, for example from DE 3 817 413 AI, to provide an annular connecting piece which is arranged in the region of a connection bore in the fuel storage line.
- the connecting piece encompasses the fuel storage line in the area of the connection bore and has a thread.
- the thread serves to screw in a retaining nut with which a line to be connected to the fuel storage line is pretensioned in the direction of the fuel storage line. Since the connector comprises 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 to the fuel storage line via a weld seam.
- the object of the invention is to provide an improved method for producing a fuel storage line and an improved fuel storage line.
- An advantage of the invention is that the connector is applied to the fuel storage line with a pretension. This creates a non-positive connection between the connecting piece and the fuel storage line using a simple method. Thus, the position of the connector with respect to the fuel storage line is fixed. Furthermore, the pretensioning of the connecting piece has the advantage that a pretension acts on the fuel storage line and the high pressure resistance of the fuel storage line is thereby increased. In particular in a connection area in which there is a hole in the fuel storage line, the pretension has a positive effect, since the material structure of the force Material storage line in the area of the connector is kept in a more stable area by the bias.
- the hole is only introduced into the fuel storage line after the connection piece has been installed.
- the connector can already have an opening in the area of the hole to be made.
- connection piece is applied by a temporal expansion of the inside diameter of the connection piece or by a temporal shrinkage of the outside diameter of the fuel »storage line.
- the widening of the connecting piece and / or the shrinking of the outer diameter of the fuel storage line are simple and common methods by means of which a connecting piece can be mounted on the fuel storage line with a preload.
- the connection piece has an inner diameter that is smaller than the outer diameter of the fuel storage line.
- connection piece and / or the outside diameter of the fuel storage line again assumes the original size, so that the connection piece exerts a prestressing force directed radially towards the center of the fuel storage line on the wall of the fuel storage line.
- a uniform distribution of the pretensioning force over the circumference of the fuel storage line is thus achieved overall.
- a fuel storage line is used which has at least two connection areas, the outside diameters of which are different. In this way, a first connection piece with a larger inner diameter can be pushed on from one side via an outer connection area with a smaller outer diameter. Only then is the first connection piece pushed onto the second connection area by a lateral pressing-on process.
- a second connection piece is provided for the second connection area, which has a smaller inner diameter compared to the first connection piece and is also pushed onto the second connection area by a lateral pressing-on process. In this way it is possible to push a connection piece over a connection area to a further connection area without a shrinking or widening process and only to apply the connection piece to the fuel storage line with a pretensioning with a pretensioning in the further connection area.
- a connection area is produced by compressing the fuel storage line.
- the outer diameter of the fuel storage line is increased by the compression.
- 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 produced through a solid tube, into which a cavity is introduced through a longitudinal bore. Subsequently, the outer diameter of the fuel storage line is increased by compressing the fuel storage line in predetermined connection areas. This creates a structural stress in the compression area, which leads to improved compressive strength and, in addition, the material thickness in the area of the connection areas is increased. A larger material thickness leads to increased compressive strength.
- the increased pressure resistance is admittedly made a little easier by the introduction of the hole. low, but overall it is still sufficiently large to withstand the required high pressure ranges without damage.
- FIG. 1 is a perspective view of a fuel storage line with connectors
- FIG. 2 shows a cross section through the fuel storage line in the connection area
- FIG. 3 shows a cross section through a further embodiment of a connection area
- Fig. 4 shows a third embodiment of a connection area of a fuel storage line
- connection areas which have different outside diameters.
- the invention is described below using the exemplary embodiment of a fuel storage line for an internal combustion engine, in particular for a diesel or gasoline-operated internal combustion engine.
- the invention is not limited to this exemplary embodiment, but can be used in any type of high-pressure line to which lines are to be connected.
- the fuel storage line 1 shows a perspective illustration of a fuel storage line for an internal combustion engine.
- the fuel storage line 1 has a hollow cylindrical shape, which is closed in a first end region and is designed in a second end region to connect a supply line.
- the supply line is connected to a fuel pump, the
- a fuel storage line 1 has a plurality of connection areas 5, to which lines 6 are connected. In the example of internal combustion engines, lines 6 are connected to injection valves which inject the fuel supplied from the fuel storage line via line 6 into the internal combustion engine.
- connection piece 2 is provided, which is ring-shaped and comprises the fuel storage line 1.
- a connecting screw 3 is screwed onto the connecting piece 2.
- the connection pieces 2 are applied to the fuel storage line 1 in such a way that the connection pieces 2 exert a pretension in the direction of the wall of the fuel storage line 1.
- the preload is generated, for example, by the fact that the outer diameter of the connection area 5 is larger than the inner diameter of the connection piece 2 before the assembly. So that the connection piece 2 can be applied to the connection area 5, either the inner diameter of the connection piece 2 is expanded and / or the outer diameter of the connection area 5 reduced.
- An expansion of the inside diameter of the connector 2 is achieved, for example, by an increase in the temperature of the connector 2.
- the connector 2 is usually made of a metallic material that expands with increasing temperature. The expansion also increases the inside diameter of the connector 2.
- a shrinkage of the outside diameter of the fuel storage line 1 in the area of the connection area 5 is achieved in that the force material 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 outside diameter of the fuel storage line decreases.
- connection piece 2 has been arranged in the connection area 5
- connection piece 2 and / or the connection area 5 is brought to ambient temperature again.
- the inside diameter of the connection piece 2 is reduced and / or the outside diameter of the connection area 5 increases.
- the connector 2 has a biasing force which acts in the radial direction to the fuel storage line 1.
- the outside diameter of the connection area 5 is a few percent larger than the inside diameter of the connection piece 2.
- the connection piece 2 is pushed onto the connection area 5 by a lateral crimping process. Due to the mechanical properties of the connector 5, an expansion of the inner diameter of the connector 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 connector 2 is not reached. The widening of the inside diameter of the connection piece 2 causes the connection piece 2 to be pretensioned, which acts on the fuel storage line after the crimping process has ended.
- FIG. 2 shows a cross section through a connection area 5 of the fuel storage line of FIG. 1.
- the fuel storage line 1 is in the form of a hollow cylinder with a hollow volume 7.
- the wall of the fuel storage line 1 has an Closing opening 8, which is guided from the hollow volume 7 to the outer surface of the fuel storage line 1.
- Near the outer surface of the fuel accumulator line 1 widens that the connection opening 8 ⁇ their cross-section and forms a sealing surface 5 9, selected in the.
- Embodiment is annular.
- An associated sealing surface of the connecting screw 3 lies on the sealing surface 9.
- the connecting screw 3 has an external thread which is screwed to an internal thread of the connecting piece 2.
- the connector 2 is formed in the direction of the line 4 with a greater material thickness.
- the greater material thickness has the advantage that a long • internal thread can be formed. With the long internal thread, the connecting screw 3 can be placed on the sealing surface 9
- the connecting screw 3 has a through hole which is guided to a second end piece 10. At the second end piece 10, the connection screw 3 has an external thread,
- the second end piece 10 has a further sealing surface 12, which is conical in this exemplary embodiment.
- the line 4 has at the end that the second
- End piece 10 is also assigned a conical outer sealing surface.
- the connector 2 preferably has a plane
- connection piece 2A shows a cross section through a connection piece 2.
- the circular inner diameter I which is encompassed by the connection piece 2, can be clearly seen.
- the flat surface 13 can be seen, which in the area of a Connection opening 14 is arranged through which the connecting screw 3 is guided in the assembled state.
- FIG. 3 shows a further embodiment of a fuel storage line 1, in which the connection opening 8 has a conical third sealing surface 15 in the outer end region.
- the line 4 is led directly to the third conical sealing surface 15.
- line 4 also has a conical outer sealing surface in the end region, which is assigned to fuel storage line 1, for optimum sealing.
- the line 4 is screwed to the connecting piece 2 via an adjusting sleeve 16 and a second union nut 17.
- 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 lies with a lower edge area on a flank 19 of the line 4.
- FIG. 4 shows a further embodiment for the connection of a line 4 to a fuel storage line 1, wherein in this exemplary embodiment the prestressed connection piece 2 has an external thread and a third union nut 18 is provided, which is screwed to the second connection piece 2 via an internal thread , In this exemplary embodiment too, an adjusting sleeve 16 is provided in order to achieve an optimal introduction of force onto the line 4.
- FIG. 5 shows a further preferred embodiment of a fuel storage line 1, which has connection areas 5 with different outside diameters. In the exemplary embodiment shown, four connection openings 8 are provided.
- the connection areas 5 are divided into two inner connection areas 5A and two outer connection areas 5B.
- the inner connection areas 5A have a first outer diameter R1 and the outer connection areas 5B have a second outer diameter R2.
- the first outer diameter R1 is larger than the second outer diameter R2.
- First connection pieces 2A are applied to the inner connection areas 5A, the inner diameters of which are matched to the outer diameters of the inner connection areas 5A in such a way that the first connection pieces 2A are pushed laterally onto the inner connection areas 5A by a crimping process and then after the pushing-on process a prestress on the inner connection areas 5A.
- the outer connection areas 5B are assigned second connection pieces 2B, the inner diameters of which are adapted to the outer diameters of the outer connection areas 5B in such a way that the connection pieces 2 can be pushed onto the outer connection areas 5B from the outside by a lateral crimping process and after the pushing-on process with a pre-tension rest on the outer connection areas 5B.
- the inner diameters of the first connection pieces 2A are designed in such a way that the first connection pieces 2A can be pushed over the outer connection area 5B to the inner connection area 5A without a squeezing process. In this way, it is possible to apply connecting pieces to inner connection areas with a pretension even with more than two connection areas using a simple lateral crimping process.
- FIG. 5 shows four connections, but several connections can also be represented by a corresponding adaptation of the outside diameter of the connection areas 5 or the inside diameter of the connection pieces 2.
- connecting pieces and connecting areas have almost the same inside and outside diameters. This means that connection pieces can be pushed onto the connection areas without any problems.
- the outer diameter of the connection areas is then enlarged by an upsetting process. This creates a pretension in the connector, which acts on the fuel storage line.
- a compression is generated, for example, in that the connection areas have a stepwise enlarged diameter compared to the fuel storage line (FIG. 5).
- Two tools 22, which compress the connection area can engage on the stepped side surface 21.
Abstract
Description
Claims
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 true EP1442211A1 (en) | 2004-08-04 |
EP1442211B1 EP1442211B1 (en) | 2009-01-21 |
Family
ID=7704892
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02776874A Expired - Fee Related 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 (15)
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 |
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 |
GB2322922B (en) * | 1997-03-03 | 2002-03-06 | Usui Kokusai Sangyo Kk | 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 WO PCT/DE2002/004114 patent/WO2003040547A1/en active Application Filing
- 2002-11-06 JP JP2003542776A patent/JP2005508478A/en active Pending
- 2002-11-06 EP EP02776874A patent/EP1442211B1/en not_active Expired - Fee Related
- 2002-11-06 HU HU0401960A patent/HU228720B1/en not_active IP Right Cessation
- 2002-11-06 DE DE50213243T patent/DE50213243D1/en not_active Expired - Lifetime
-
2004
- 2004-05-06 US US10/840,565 patent/US7213577B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO03040547A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE10154645A1 (en) | 2003-06-12 |
US7213577B2 (en) | 2007-05-08 |
WO2003040547A1 (en) | 2003-05-15 |
HU228720B1 (en) | 2013-05-28 |
EP1442211B1 (en) | 2009-01-21 |
JP2005508478A (en) | 2005-03-31 |
HUP0401960A2 (en) | 2005-01-28 |
DE50213243D1 (en) | 2009-03-12 |
US20040206336A1 (en) | 2004-10-21 |
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