EP3470664A1 - Brennstoffschienenanordnung für ein brennstoffeinspritzsystem und verfahren zur herstellung solch einer brennstoffschienenanordnung - Google Patents

Brennstoffschienenanordnung für ein brennstoffeinspritzsystem und verfahren zur herstellung solch einer brennstoffschienenanordnung Download PDF

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Publication number
EP3470664A1
EP3470664A1 EP17196394.5A EP17196394A EP3470664A1 EP 3470664 A1 EP3470664 A1 EP 3470664A1 EP 17196394 A EP17196394 A EP 17196394A EP 3470664 A1 EP3470664 A1 EP 3470664A1
Authority
EP
European Patent Office
Prior art keywords
fuel
fuel rail
stainless steel
rail assembly
components
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.)
Ceased
Application number
EP17196394.5A
Other languages
English (en)
French (fr)
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 Technologies 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 Technologies GmbH filed Critical Continental Automotive Technologies GmbH
Priority to EP17196394.5A priority Critical patent/EP3470664A1/de
Publication of EP3470664A1 publication Critical patent/EP3470664A1/de
Ceased 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
    • 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
    • F02M61/166—Selection of particular materials
    • 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
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors
    • 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
    • F02M2200/80—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
    • 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
    • F02M2200/90—Selection of particular materials
    • F02M2200/9053—Metals

Definitions

  • the present disclosure relates to a fuel rail assembly for a fuel injection system for an internal combustion engine and to a method of manufacturing a fuel rail assembly.
  • a fuel rail assembly for a fuel injection system for an internal combustion engine comprises a fuel rail, also known as a common rail or a main gallery, which typically comprises an elongate tubular member forming a reservoir for fuel which is supplied to an inlet of the fuel rail under high pressure by a fuel pump.
  • the fuel rail has a plurality of fuel outlets spaced along its length each of which is in hydraulic communication with a fuel injector by which fuel is injected into the engine.
  • each cylinder of a multicylinder internal combustion engine has a fuel injector which injects fuel directly into the combustion chamber.
  • the present disclosure makes use of the idea to manufacture the individual components of the fuel rail assembly by different materials having different characteristics selected from a group of materials, in particular steels.
  • the present disclosure provides a fuel rail assembly for a fuel injection system for an internal combustion engine.
  • the fuel rail assembly comprises a plurality of components.
  • the plurality of components of the fuel rail assembly includes at least an elongate fuel rail having a fuel inlet and a plurality of fuel outlets spaced along the fuel rail, each outlet having a fuel adapter bonded thereto to provide a mechanical and hydraulic communication with a fuel injector cup adapted to receive a fuel injector.
  • Two or more of the components comprise differing materials, in particular differing steels, preferably differing stainless steels.
  • the material from which the two or more of the components is manufactured may be selected from a group of materials in dependence upon one or more characteristics or properties required for the component.
  • the group of materials may be the group of steels and in some embodiments the group of stainless steels.
  • the fuel rail assembly may be thought of as a multi-steel fuel rail assembly.
  • the group of steels may comprise duplex stainless steel, austenitic stainless steel, ferritic stainless steel, martensitic stainless steel and carbon steel.
  • the differing steels may be differing steels of a class of steels, for example, differing types of austenitic steel, or may belong to different classes of steels, for example a duplex steel and a ferritic steel.
  • the characteristic of the material and of the component may be corrosion resistance against fuel.
  • the components of the fuel rail assembly which in use come into contact with fuel may comprise a steel, in particular, a stainless steel which has better corrosion resistance against fuel.
  • the components of the fuel rail assembly which in use do not come into contact with fuel may comprise a steel, including a stainless steel, which has a worse corrosion resistance against fuel than the steel used for the components or some of the components that come into contact with fuel.
  • the component parts which, in use, are in contact with the fuel may include the fuel rail, a blanking plate, the fuel inlet, a sensor adapter port, the fuel outlet adapters, the fuel cup and a fuel pipe.
  • the component parts which, in use, are in contact with the fuel may be formed of one or more stainless steels with a better corrosion resistance against fuel, for example a duplex stainless steel or an austenitic stainless steel.
  • One or more or all of the components of this group may be formed of the same stainless steel or all of the components may be formed from different stainless steels.
  • the components which are not in contact with the fuel may be formed from a steel that is less corrosion resistant to fuel, for example carbon steel, austenitic stainless steel, or ferritic stainless steel. These materials may be cheaper and/or easier to manufacture.
  • One or more or all of the components of this group may be formed of the same steel or all of the components may be formed from different steels.
  • the fuel rail is formed of duplex stainless steel.
  • Duplex stainless steels have a two-phase microstructure consisting of grains of ferritic and austenitic stainless steel. The austenitic phase may be present as "islands" surrounded by the ferritic phase.
  • a duplex stainless steel may include approximately 50% austenite phases and 50% ferrite phases.
  • duplex structure gives duplex stainless steels a combination of attractive properties:
  • duplex stainless steels Due to the increased yield strength of duplex stainless steels compared to austenitic stainless steel, it may be possible to reduce the section thickness of a component fabricated from a duplex stainless steel. This can lead to significant cost and weight savings compared to a solution in austenitic stainless steels.
  • the mechanical and hydraulic communication between the fuel adapter the mechanical and hydraulic communication between the fuel adapter and the fuel injector cup includes a fuel pipe.
  • the fuel pipe may be formed of duplex stainless steel.
  • the fuel rail may be formed of duplex stainless steel, for example 1.4162.
  • the blanking plate, fuel inlet, sensor adapter port, fuel outlet adapters, and injector cups may be formed of austenitic stainless steel, for example 1.4305.
  • the fuel pipe may be formed of austenitic stainless steel, for example 1.4301, and the mount bracket may be formed of carbon steel, for example 1.0214. Straps and the fuel rail mounting bracket may be formed of ferritic stainless steel, for example 1.4509.
  • the numbers 1.4162, 1.4305, 1.4301, 1.0214 and 1.4509 in this paragraph and elsewhere in this disclosure denote the respective steel grades according to the Euronorm (EN).
  • a fuel rail formed of duplex stainless steel 1.4162, a blanking plate, fuel inlet, sensor adapter port, a fuel outlet adapter and an injector cup formed of austenitic stainless steel 1.4305, a fuel pipe formed in austenitic stainless steel 1.4301, a mount bracket formed of carbon steel 1.0214, and straps and a fuel rail mounting bracket formed of ferritic stainless steel 1.4509 may be used.
  • the present disclosure also provides a method of manufacturing a fuel rail assembly for a fuel injection system for an internal combustion engine.
  • the fuel rail assembly comprises a plurality of components.
  • the plurality of components may include at lest an elongate fuel rail having a fuel inlet and a plurality of fuel outlets spaced along the fuel rail each outlet having a fuel adapter bonded thereto to provide a mechanical and hydraulic communication with a fuel injector cup adapted to receive a fuel injector.
  • the method comprises selecting the material from which two or more of the components is manufactured from a group of materials in dependence upon at least one characteristic required for the component, such that at least two of the components comprise differing steels.
  • the group of materials may consist of a group of steels or a group of stainless steels and may comprise duplex stainless steel, austenitic stainless steel, ferritic stainless steel, martensitic stainless steel and carbon steel
  • the at least one characteristic comprises corrosion resistance to fuel.
  • one or more of characteristics including mechanical strength, formability, for example ductility, machinability, suitability for welding or brazing, for example, may be taken into consideration for selecting the material for a particular part.
  • the components that come into contact with fuel such as the fuel rail, a blanking plate, the fuel inlet, a sensor adapter port, the fuel outlet adapters, the fuel cup and a fuel pipe are formed of an austenitic steel or a duplex steel.
  • the components which in use do not come into contact with the fuel may be formed from a steel that is less corrosion resistant to fuel, for example carbon steel, austenitic stainless steel, or ferritic stainless steel.
  • the fuel rail assembly further comprises at least one mounting bracket adapted to enable the fuel rail assembly to be fastened to the engine.
  • the method further comprises forming the mounting bracket from ferritic stainless steel.
  • the materials of the components have different coefficients of thermal expansion. If two components which are to be brazed together having different coefficients of thermal expansion, the method may further comprise manufacturing the components with dimensions such that when the components are heated to a predetermined brazing temperature in a furnace the gap between the surfaces to be brazed together is at a predetermined spacing. This enables a reliable brazed joint to be formed despite the change in relative dimensions between the parts to be joined at the brazing temperature compared to room temperature.
  • At least two of the components are welded together. Alternatively and/or additionally, at least two of the components are brazed together.
  • the fuel rail assembly comprises a fuel rail 2 which comprises an elongate tubular member forming a reservoir for fuel.
  • the fuel rail 2 is formed of duplex stainless steel. At one end the tube is supplied with a fuel inlet 4 connected to a high-pressure fuel pump by which fuel is supplied to the fuel rail. The other end of the fuel rail 2 is closed by a blanking plate 6. Intermediate its length, the fuel rail has a sensor adapter port 8 for a sensor (not shown) monitoring the fuel pressure in the fuel rail 2.
  • a fuel rail mounting bracket 10 by which the fuel rail 2 is secured to the engine is provided intermediate the length of the fuel rail 2 at a position determined by the installation conditions of the engine.
  • the fuel rail 2 Spaced along its length the fuel rail 2 has four fuel adapters 12, or fuel outlet adapters, which provide a mechanical and hydraulic connection to a fuel cup 14 which is adapted to receive an inlet port of a fuel injector (not shown).
  • the fuel outlet adapter 12 is connected mechanically and hydraulically to the fuel cup 14 by means of a fuel pipe 16. It will be understood that the present disclosure may be adapted for use for engines having one or more cylinders, particularly for example, in designs in which the fuel is injected into the engine intake manifold.
  • the fuel rail assembly is connected to the engine by mount brackets 18 which have a through bore 20 through which a bolt (not shown) passes to secure the mount brackets 18 to the engine.
  • the mount brackets 18 are secured to the respective fuel pipes 16 by straps 22.
  • the component parts which, in use, are in contact with the fuel may all be formed of a stainless steel selected from the group consisting of duplex stainless steel, and austenitic stainless steel.
  • the components which are not in contact with the fuel for example the mount bracket 18, straps 22 and the fuel rail mounting bracket 10, may be formed from a carbon steel, austenitic stainless steel, ferritic stainless steel or in principle any other steel material more suited to manufacture by techniques such as cold-forming or stamping.
  • the fuel rail 2 is formed of duplex stainless steel, for example, 1.4162, which, because of its strength, enables the fuel rail to be formed of a thinner, and hence lighter, material than previous fuel rails, which reduces considerably the stresses applied to the fuel rail and its related components caused by vibration.
  • the blanking plate 6, fuel inlet 4, sensor adapter port 8, fuel outlet adapter 12, and injector cup 14 are formed in austenitic stainless steel, for example, 1.4305.
  • the fuel pipe 16 is formed in austenitic stainless steel, for example 1.4301, and the mount bracket 18 is formed in carbon steel, for example 1.0214.
  • the straps 22 and the fuel rail mounting bracket are formed of ferritic stainless steel, for example 1.4509.
  • the reduction in stress caused by the lower weight of the fuel rail 2 enables the mass of material used in the fuel pipe 16 and the fuel cup 14, together with the mount brackets 18 and the straps 22 also to be reduced with a consequent saving in weight and cost.
  • the components may be welded together but in order to ensure reliable corrosion resistance between the components particularly those contacted by the fuel, it may be preferable that they are brazed together.
  • the fuel outlet adapters 12 prefferably be formed of a lower cost stainless steel such as ferritic stainless steel because of its easier machinability, which, apart from its lower cost, facilitates the production of the item at a lower cost.
  • the components which are not subjected to the corrosive effects of the fuel such as the mount brackets 18 and the straps 22 are formed of a lower grade stainless steel, and as well as other components not in contact with the fuel, may alternatively be formed of carbon steel with its easier workability and low cost compared with stainless steel.
  • the components have different coefficients of thermal expansion.
  • this difference in thermal expansion coefficients can produce practical changes in the dimensions of the components.
  • the difference in thermal expansion coefficient, particularly for adjoining components that are brazed together may be taken into account when selecting and determining the dimensions of the components. It is therefore desirable for the dimensions of the components as manufactured to take the difference in thermal expansion into account such that when heated to the brazing temperature in a furnace, the gap between the surfaces to be brazed is at the correct spacing for the brazing to be successfully carried out.

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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)
EP17196394.5A 2017-10-13 2017-10-13 Brennstoffschienenanordnung für ein brennstoffeinspritzsystem und verfahren zur herstellung solch einer brennstoffschienenanordnung Ceased EP3470664A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP17196394.5A EP3470664A1 (de) 2017-10-13 2017-10-13 Brennstoffschienenanordnung für ein brennstoffeinspritzsystem und verfahren zur herstellung solch einer brennstoffschienenanordnung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17196394.5A EP3470664A1 (de) 2017-10-13 2017-10-13 Brennstoffschienenanordnung für ein brennstoffeinspritzsystem und verfahren zur herstellung solch einer brennstoffschienenanordnung

Publications (1)

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EP3470664A1 true EP3470664A1 (de) 2019-04-17

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EP17196394.5A Ceased EP3470664A1 (de) 2017-10-13 2017-10-13 Brennstoffschienenanordnung für ein brennstoffeinspritzsystem und verfahren zur herstellung solch einer brennstoffschienenanordnung

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Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0273279A2 (de) * 1986-12-30 1988-07-06 Nisshin Steel Co., Ltd. Verfahren zur Herstellung von rostfreien Chromstahlband mit Zweiphasen-Gefüge mit hoher Festigkeit und hoher Dehnung und mit niedriger Anisotropie
JP3342329B2 (ja) * 1996-12-02 2002-11-05 三菱重工業株式会社 異種材料の接合方法
US20060243353A1 (en) * 2005-04-29 2006-11-02 Milam David L Welding together low and high carbon steels
US20070012748A1 (en) * 2001-06-29 2007-01-18 Mccrink Edward J Method for manufacturing multi-component structural members
WO2008028704A1 (de) * 2006-09-07 2008-03-13 Robert Bosch Gmbh Injektor zum einspritzen von kraftstoff
US20100001215A1 (en) * 2008-07-07 2010-01-07 Keihin Corporation Electromagnetic fuel injection valve
WO2010050566A1 (ja) * 2008-10-31 2010-05-06 株式会社神菱 デリバリパイプ
US20140261330A1 (en) * 2013-03-15 2014-09-18 Robert J. Doherty Internal secondary fuel rail orifice
EP2789845A1 (de) * 2013-04-08 2014-10-15 Benteler Automobiltechnik GmbH Kraftstoffverteiler aus Duplexstahl
KR20150048548A (ko) * 2013-10-28 2015-05-07 주식회사 현대케피코 차량용 연료레일
WO2017050850A1 (en) * 2015-09-24 2017-03-30 Continental Automotive Gmbh Fuel rail assembly and method for manufacturing a fuel rail assembly
DE102015226795A1 (de) * 2015-12-29 2017-06-29 Robert Bosch Gmbh Komponente einer hydraulischen Einrichtung, insbesondere einer Brennstoffeinspritzanlage für Brennkraftmaschinen

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0273279A2 (de) * 1986-12-30 1988-07-06 Nisshin Steel Co., Ltd. Verfahren zur Herstellung von rostfreien Chromstahlband mit Zweiphasen-Gefüge mit hoher Festigkeit und hoher Dehnung und mit niedriger Anisotropie
JP3342329B2 (ja) * 1996-12-02 2002-11-05 三菱重工業株式会社 異種材料の接合方法
US20070012748A1 (en) * 2001-06-29 2007-01-18 Mccrink Edward J Method for manufacturing multi-component structural members
US20060243353A1 (en) * 2005-04-29 2006-11-02 Milam David L Welding together low and high carbon steels
WO2008028704A1 (de) * 2006-09-07 2008-03-13 Robert Bosch Gmbh Injektor zum einspritzen von kraftstoff
US20100001215A1 (en) * 2008-07-07 2010-01-07 Keihin Corporation Electromagnetic fuel injection valve
WO2010050566A1 (ja) * 2008-10-31 2010-05-06 株式会社神菱 デリバリパイプ
US20140261330A1 (en) * 2013-03-15 2014-09-18 Robert J. Doherty Internal secondary fuel rail orifice
EP2789845A1 (de) * 2013-04-08 2014-10-15 Benteler Automobiltechnik GmbH Kraftstoffverteiler aus Duplexstahl
KR20150048548A (ko) * 2013-10-28 2015-05-07 주식회사 현대케피코 차량용 연료레일
WO2017050850A1 (en) * 2015-09-24 2017-03-30 Continental Automotive Gmbh Fuel rail assembly and method for manufacturing a fuel rail assembly
DE102015226795A1 (de) * 2015-12-29 2017-06-29 Robert Bosch Gmbh Komponente einer hydraulischen Einrichtung, insbesondere einer Brennstoffeinspritzanlage für Brennkraftmaschinen

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