EP3470663A1 - Kraftstoffleistenanordnung für ein kraftstoffeinspritzsystem für eine brennkraftmaschine - Google Patents

Kraftstoffleistenanordnung für ein kraftstoffeinspritzsystem für eine brennkraftmaschine Download PDF

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Publication number
EP3470663A1
EP3470663A1 EP17196196.4A EP17196196A EP3470663A1 EP 3470663 A1 EP3470663 A1 EP 3470663A1 EP 17196196 A EP17196196 A EP 17196196A EP 3470663 A1 EP3470663 A1 EP 3470663A1
Authority
EP
European Patent Office
Prior art keywords
fuel
adapter
fuel rail
thickness
rail
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP17196196.4A
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English (en)
French (fr)
Other versions
EP3470663B1 (de
Inventor
Giandomenico Serra
Gisella Di Domizio
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.)
Vitesco Technologies 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
Priority to EP17196196.4A priority Critical patent/EP3470663B1/de
Publication of EP3470663A1 publication Critical patent/EP3470663A1/de
Application granted granted Critical
Publication of EP3470663B1 publication Critical patent/EP3470663B1/de
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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/004—Joints; Sealings
    • F02M55/005—Joints; Sealings for high pressure conduits, e.g. connected to pump outlet or to injector inlet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
    • F02M69/462—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down
    • F02M69/465—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down of fuel rails
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/03—Fuel-injection apparatus having means for reducing or avoiding stress, e.g. the stress caused by mechanical force, by fluid pressure or by temperature variations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8084—Fuel injection apparatus manufacture, repair or assembly involving welding or soldering
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/85—Mounting of fuel injection apparatus
    • F02M2200/856—Mounting of fuel injection apparatus characterised by mounting injector to fuel or common rail, or vice versa

Definitions

  • the present disclosure relates to a fuel rail assembly for a fuel injection system for an internal combustion engine and also to a method of manufacturing and assembling together components of the assembly.
  • Fuel rails also referred to as common rails or main galleries, are widely used in fuel injection systems for internal combustion engines, and consist of a reservoir typically in the form of an elongate tube having a fuel inlet and a plurality of fuel outlets spaced along the rail. Fuel at high pressure is fed to the fuel inlet of the fuel rail from whence it is delivered through the fuel outlets to fuel injectors.
  • the fuel injectors may inject fuel into a manifold of the internal combustion engine but, more usually, each cylinder of the engine has an associated fuel injector which injects fuel directly into the combustion chamber of the cylinder.
  • the fuel rail assembly has a fuel adapter that is bonded, usually by brazing, to each of the fuel outlets of the fuel rail.
  • the fuel adapter has an outlet providing a hydraulic connection between the fuel rail, the fuel adapter and the fuel injector, the hydraulic connection including a fuel injector cup into which the fuel injector is inserted.
  • the fuel injector cup is formed as an integral part of the fuel adapter and in another form, a pipe leads from the fuel adapter to a fuel injector cup.
  • Such systems operate in a harsh environment when placed in a vehicle which involves high temperatures and high pressure which is variable throughout each induction phase of the engine.
  • the systems are also subject to vibration from the vehicle and its movement and also to separate vibration of the engine on its engine mounts.
  • the components subject to the fuel pressure are additionally subjected to substantial stresses caused by the variation in the fuel pressure.
  • components and the brazed joints between them are subject to stresses which can lead to premature failure and insufficient durability.
  • European Patent No. EP 246 6111 discloses an arrangement in which a separate mounting structure is provided which is adapted to disperse the stress caused by an impact applied to an injector cup due to a repulsive force when the fuel is injected.
  • the structure has a mount unit which is connected to the fuel rail by brazing and is also connected to a fuel adapter which incorporates an injector cup.
  • the injector cup is bonded to the fuel pipe and to the mount via a bridge.
  • the mount unit is secured to the fuel rail adjacent the fuel adapter but in one form is spaced from the fuel adapter further along the fuel rail in order to spread the stresses.
  • This arrangement is expensive to manufacture, takes up extra space in the engine bay and also limits the manner in which the fuel rail can be installed in the engine as it must be very close to the engine cylinder head.
  • a fuel rail assembly for a fuel injection system for an internal combustion engine comprising an elongate fuel rail having a fuel inlet and a plurality of fuel outlets spaced along the fuel rail, each outlet has a fuel adapter bonded thereto to provide a hydraulic communication with a fuel injector cup.
  • the fuel injector cup is in particular adapted - i.e. in particular shaped and arranged - to receive a fuel injector.
  • the fuel adapter has a variable material thickness. With advantage, the thickness may be adapted to the characteristics of the fuel rail and the fuel adapter in order, in use, to equalise substantially the stresses applied to these components and the bond therebetween.
  • the present disclosure describes an advantageous approach in which the fuel adapter and its bonding area, where it is bonded to the fuel rail, are designed to dissipate the stresses in a particulary uniform manner throughout the components and the brazed joint.
  • the fuel adapter is brazed to the fuel rail over a bonding area, the size of the bonding area and its shape being determined to provide a uniform stress in the brazed joint.
  • the shape of the fuel adapter may also be formed to provide a uniform stress, in particular a uniform stress in and around the brazed joint, for example by avoiding edges and points and/or by providing a smoothly varying shape.
  • the cross-sectional area of the fuel adaptor may be varied along its length by varying its lateral extent as well as, or alternatively by varying its thickness.
  • the fuel adapter may be brazed to the fuel rail over a bonding area defined by a fuel adapter base, the bonding area and its shape being determined to provide, in use, a substantially uniform stress across the brazed joint.
  • the inner face of the fuel adapter base is shaped to mate with the periphery of the fuel rail. For example, if the fuel rail has an arcuate surface, for example a convex surface as it has the form of a cylindrical tube, the inner face of the base of the fuel adapter has an arcuate surface, for example a concave surface, so that it can mate with the periphery of the fuel rail.
  • the periphery of the bonding area has no sharp changes in direction which would result in stress concentration in the joint.
  • the thickness of the material of the fuel adapter is reduced towards the periphery of the bonding area so that the uniformity of the stress in increased and the stress distribution is more uniform in order that little or no stress concentration arises as a result of the change in material thickness between the fuel adapter and the fuel rail at the junction at the periphery of the bonding area, for example at the periphery of the base of the fuel adapter.
  • the hydraulic connection between the fuel adapter and the fuel injector cup includes a delivery pipe which is brazed to the fuel adapter.
  • the delivery pipe is located in a bore in a spigot of the fuel adapter and the thickness of the material of the fuel adapter is reduced towards the outer end of the bore or spigot. In this way, little or no stress concentration may arise as an advantageous result of the change in material thickness at the junction between the fuel adapter and the pipe.
  • the spigot may be positioned at the opposing end of the fuel adapter to the fuel adapter base.
  • a method of joining at least one component of a fuel rail assembly to a fuel rail including the step of varying the material thickness of the component over at least part of the component and reducing the thickness of the material towards the periphery of its contact area with the fuel rail so that the change in thickness of the material at the junction between the component and the fuel rail is minimal to reduce stress concentration at the junction.
  • the method may further comprise bonding the component to the fuel rail by brazing the contact area to the fuel rail.
  • the component is a fuel adapter and the contact area is provided by an inner face of a base of the fuel adapter, the inner face being shaped to mate with the periphery of the fuel rail.
  • the thickness of the material of the base of the fuel adapter may be increasingly reduced towards the periphery.
  • the form of the base and periphery may be without corners and edges to provide a smooth surface which avoids possible positions of stress concentration.
  • the fuel adapter may comprise a spigot defining a bore for a delivery pipe.
  • the spigot may be positioned at the opposing end of the adapter from the base.
  • a delivery pipe is located in the bore and bonded to the spigot.
  • the method may further comprise reducing the thickness of the material of the fuel adapter towards the outer end of the spigot of the fuel adapter to avoid a stress concentration arising as a result of a change in material thickness between the fuel adapter and the pipe.
  • the method may further comprise inserting the delivery pipe into the bore of the spigot and brazing the delivery pipe to the spigot to bond the delivery pipe to the fuel adapter.
  • the fuel rail assembly of the present disclosure has a structure of the components, in particular structure of the components at the joints between components which is shaped to avoid spatially localised areas of increased stress in order to improve the reliability and durability of the assembly.
  • the fuel rail assembly of the present disclosure also provides a very cost effective solution to improving the durability of the assembly since it does without the necessity of having an extra stress-relieving component thus also providing a more compact design. It also enables flexibility in the location of the fuel rail relative to the engine.
  • the fuel rail 2 comprises an elongated tube forming a reservoir for fuel which is supplied to an inlet 4.
  • the fuel rail 2 has a plurality of fuel outlets 6 (shown in Figure 2 ) spaced along the length of the fuel rail 2 but only one is shown for the purposes of illustration.
  • a fuel adapter 8 is brazed to the fuel rail 2 and provides a connection to a fuel pipe 10 which provides a fluid connection between the fuel rail to and a fuel injector cup 12 which is adapted to receive a fuel inlet port of a fuel injector (not shown) to provide a fuel passage from the fuel rail into the injector for injection into the engine.
  • the fuel adapter 8 has a fuel adapter base 16 which provides a bonding area by which the fuel adapter 8 is brazed to the fuel rail 2.
  • an interior surface of the adapter base 16 provides a bonding area shaped to provide a mating surface adapted to the exterior surface of the fuel rail 2 to enable the two components to be brazed together. The size and shape of the bonding area may be determined by the loads to which the brazed joint is subject in operation.
  • the periphery of the fuel adapter base 16 is shaped so as not to have any sudden changes in direction which would lead to a stress concentration point, thus, it can be seen that changes in direction of the periphery have a radius 20.
  • the thickness of the base 16 is at a minimum at the periphery 18 so that the change in material thickness at the junction between the fuel adapter base 16 and the fuel rail 2 is at a minimum to minimise stress concentrations at this point.
  • the material thickness of the base 16 increases to merge with a spigot 22 into which the fuel pipe 10 is inserted stop the fuel pipe 10 is brazed to the spigot 22 at the outer end 24 of the spigot 22.
  • the thickness of the outer end of the spigot is gradually reduced so that it is at a minimum at the junction between the outer ends 24 of the spigot and the fuel pipe 10 to thereby minimise stress concentrations at this point.
  • the thickness of the spigot wall and the spacing between the inlet end of the pipe 10 and the fuel rail 2 is determined by the stress levels encountered in practice, for example in a particular internal combustion engine. In this way the stresses applied to the components, the fuel rail 2, the fuel adapter 8 and the fuel pipe 10 and the brazed junctions between them are kept as low as possible by appropriate dimensions of the components. In this way, the cross-sectional area of the fuel adaptor 8 may be varied along its length by varying its lateral extent as well as, or alternatively and/or in addition to, varying its thickness. Thus, the stress level throughout the adapter and in the transition between adjacent components is achieved by gradual changes in material thickness and dimensions where appropriate to avoid stress concentrations.
  • Figures 1 and 2 also illustrate a schematic view of a mount 14 by which the fuel rail 2 is secured to the engine via the fuel pipe 10.
  • the mount 14 by which the fuel rail 2 is secured to the engine is not tied to the fuel rail 2 so it can be located in a more convenient position, which facilitates the installation in the engine bay.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Fuel-Injection Apparatus (AREA)
EP17196196.4A 2017-10-12 2017-10-12 Kraftstoffleistenanordnung für ein kraftstoffeinspritzsystem für eine brennkraftmaschine Active EP3470663B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP17196196.4A EP3470663B1 (de) 2017-10-12 2017-10-12 Kraftstoffleistenanordnung für ein kraftstoffeinspritzsystem für eine brennkraftmaschine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17196196.4A EP3470663B1 (de) 2017-10-12 2017-10-12 Kraftstoffleistenanordnung für ein kraftstoffeinspritzsystem für eine brennkraftmaschine

Publications (2)

Publication Number Publication Date
EP3470663A1 true EP3470663A1 (de) 2019-04-17
EP3470663B1 EP3470663B1 (de) 2022-08-31

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EP17196196.4A Active EP3470663B1 (de) 2017-10-12 2017-10-12 Kraftstoffleistenanordnung für ein kraftstoffeinspritzsystem für eine brennkraftmaschine

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Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1085953A (ja) * 1996-09-11 1998-04-07 Nippon Steel Corp 金属管の液相拡散接合部構造
WO2001071179A2 (en) * 2000-03-21 2001-09-27 Siemens Aktiengesellschaft Fuel injector assembly for mounting and aligning a fuel injector to a fuel rail
EP1378658A1 (de) * 2002-07-04 2004-01-07 Denso Corporation Speicherkraftstoffeinspritzsystem für Brennkraftmaschinen
US20040206336A1 (en) * 2001-11-07 2004-10-21 Helmut Hummel Method for producing a fuel accumulator line comprising a prestressed connection piece
US7028668B1 (en) * 2004-12-21 2006-04-18 Robert Bosch Gmbh Self-damping fuel rail
DE102008035494A1 (de) * 2008-07-30 2010-02-04 Daimler Ag Railbaugruppe einer Kraftstoffeinspritzanlage
JP2010133323A (ja) * 2008-12-04 2010-06-17 Otics Corp コモンレール
WO2010072651A2 (en) * 2008-12-23 2010-07-01 Delphi Technologies, Inc. Fuel injection system
EP2466111A2 (de) 2009-08-11 2012-06-20 Kefico Corporation Befestigungsstruktur für eine brennstoffdirekteinspritzleiste
US20140326217A1 (en) 2013-05-01 2014-11-06 Denso International America, Inc. Connecting element for gdi tube stress reduction

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2544448B1 (fr) * 1983-04-13 1985-07-19 Dba Procede de formation d'un raccordement hydraulique
CA2230745A1 (en) * 1997-03-03 1998-09-03 Kikuo Asada Method for improving fatigue strength due to repeated pressure at branch hole part in member for high pressure fluid, branch hole part of member for high pressure fluid formed by the method, and member for high pressure fluid with built-in slider having the branch hole
US6637776B2 (en) * 2001-06-13 2003-10-28 Cummins Inc. Fluid manifold connector and fluid manifold assembly
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
DE102014223060A1 (de) * 2014-11-12 2016-05-12 Robert Bosch Gmbh Brennstoffeinspritzanlage und Brennstoffspeicher für Brennstoffeinspritzanlagen

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1085953A (ja) * 1996-09-11 1998-04-07 Nippon Steel Corp 金属管の液相拡散接合部構造
WO2001071179A2 (en) * 2000-03-21 2001-09-27 Siemens Aktiengesellschaft Fuel injector assembly for mounting and aligning a fuel injector to a fuel rail
US20040206336A1 (en) * 2001-11-07 2004-10-21 Helmut Hummel Method for producing a fuel accumulator line comprising a prestressed connection piece
EP1378658A1 (de) * 2002-07-04 2004-01-07 Denso Corporation Speicherkraftstoffeinspritzsystem für Brennkraftmaschinen
US7028668B1 (en) * 2004-12-21 2006-04-18 Robert Bosch Gmbh Self-damping fuel rail
DE102008035494A1 (de) * 2008-07-30 2010-02-04 Daimler Ag Railbaugruppe einer Kraftstoffeinspritzanlage
JP2010133323A (ja) * 2008-12-04 2010-06-17 Otics Corp コモンレール
WO2010072651A2 (en) * 2008-12-23 2010-07-01 Delphi Technologies, Inc. Fuel injection system
EP2466111A2 (de) 2009-08-11 2012-06-20 Kefico Corporation Befestigungsstruktur für eine brennstoffdirekteinspritzleiste
US20140326217A1 (en) 2013-05-01 2014-11-06 Denso International America, Inc. Connecting element for gdi tube stress reduction

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