EP3599372A1 - Rampe de carburant destinée à un système d'injection de carburant et procédé de fabrication d'une telle rampe de carburant - Google Patents

Rampe de carburant destinée à un système d'injection de carburant et procédé de fabrication d'une telle rampe de carburant Download PDF

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Publication number
EP3599372A1
EP3599372A1 EP18185163.5A EP18185163A EP3599372A1 EP 3599372 A1 EP3599372 A1 EP 3599372A1 EP 18185163 A EP18185163 A EP 18185163A EP 3599372 A1 EP3599372 A1 EP 3599372A1
Authority
EP
European Patent Office
Prior art keywords
fuel rail
fuel
peripheral wall
outlets
manufacturing
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
EP18185163.5A
Other languages
German (de)
English (en)
Inventor
Roberto Ricci
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 EP18185163.5A priority Critical patent/EP3599372A1/fr
Publication of EP3599372A1 publication Critical patent/EP3599372A1/fr
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
    • 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
    • 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
    • F02M2200/8046—Fuel injection apparatus manufacture, repair or assembly the manufacture involving injection moulding, e.g. of plastic or metal
    • 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
    • F02M2200/9015—Elastomeric or plastic 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
    • 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 for a fuel injection system for an internal combustion engine and to a method of manufacturing a fuel rail.
  • a fuel rail for a fuel injection system for an internal combustion engine 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 multi-cylinder internal combustion engine has a fuel injector which injects fuel directly into the combustion chamber.
  • EP 3 253 962 A discloses a fuel rail formed from a forged blank which is subsequently subjected to two auto-frettage steps to shape the fuel rail so that it is thicker in certain parts subject to stress.
  • the present disclosure provides a fuel rail which is compact, lightweight and which can be manufactured in a cost effective manner.
  • a fuel rail for a fuel injection system for an internal combustion engine comprises an elongate substantially tubular fuel rail having a fuel inlet and a plurality of fuel outlets spaced along the fuel rail along a common axis.
  • the fuel rail has a substantially uniform cross-section and a peripheral wall with a portion having an increased thickness in the region of the common axis so that the fuel outlets are located in the portion of the peripheral wall having the increased thickness.
  • the fuel outlet(s) each have the form of a hole or bore that extends through the thickness of the peripheral wall of the fuel rail.
  • the peripheral wall of the fuel rail therefore, includes a locally increased thickness providing a thickened portion in which the fuel outlets are positioned.
  • the fuel outlets are, therefore, provided with additional mechanical strength since they are formed in the thickened portion. This avoids the formation of high stress points or regions at the fuel outlets and improves the reliability of the fuel rail.
  • the fuel rail therefore, includes a local increased reinforcement with reduced stress concentration at the fuel outlets.
  • the thickness of the remainder of the peripheral wall outside of the portion with increased thickness of the fuel rail can be lower also in the presence of higher operative pressure or stresses.
  • the cross-section and volume of the fuel rail may be substantially the same throughout the length also in the presence of higher operative pressure or stresses.
  • the fuel rail also offers the possibility of having a lower fuel weight also in the presence of higher operative pressure or stresses as the fuel rail outlets are reinforced by the locally thickened peripheral wall.
  • the substantially uniform cross-section, and, therefore, uniform volume along the longitudinal length of the fuel rail enables a uniform fuel pressure within the fuel rail and, therefore, uniform fuel pressure to be provided at each of the fuel outlets.
  • the portion of the peripheral wall including the increased thickness may be provided by a rib that is located within the fuel rail.
  • the internal rib may extend longitudinally along a length of the fuel rail and along the common axis in which the fuel outlets are positioned.
  • the rib may be integrally formed with the peripheral wall of the fuel rail and positioned in the interior of the fuel rail so that the outer surface of the fuel rail is substantially circular, whilst the inner surface includes the rib.
  • the rib has a substantially flat planar surface within which the fuel outlets are formed.
  • This enables the holes to be formed in a substantially flat planar surface rather than in a curved surface as would be the case for a tubular fuel rail having a circular internal cross-section.
  • the formation of the holes in the substantially flat planar surface enables the holes to be formed more easily and also more cleanly by techniques such as drilling, thus simplifying manufacture.
  • the flat planar surface may lie substantially on a chord of the tubular fuel rail, in particular a chord of the inner surface of a substantially circular tubular fuel rail.
  • the rib may be formed on the exterior of the fuel rail and extend longitudinally along the length of the fuel rail.
  • the fuel rail is preferably formed of a metal such as stainless steel, but alternatively may be formed of a plastics material.
  • the method comprises forming an elongate substantially tubular fuel rail with a portion of a peripheral wall of the fuel rail having a locally increased wall thickness extending along a longitudinal length of the fuel rail, and forming a plurality of holes for forming fuel outlets spaced along the longitudinal length of the fuel rail in the portion having the increased wall thickness.
  • the portion of the peripheral wall with the locally increased thickness may be formed on the interior of the fuel rail, for example by forming a rib on the interior surface of the fuel rail, the rib extending along the longitudinal length of the fuel rail.
  • the rib may be integral with the peripheral wall.
  • the rib may have a width that is greater than the diameter of the fuel outlets so that the fuel outlets are arranged in and extend through the portion of the peripheral wall having the increased thickness.
  • the rib has a flat planar surface in the interior of the fuel rail.
  • the holes for the fuel outlet may be formed in the flat planar surface, for example by drilling.
  • the fuel rail is formed with a substantially uniform cross-section throughout its length.
  • the substantially uniform cross-section, and, therefore, uniform volume along the longitudinal length of the fuel rail enables pressure fluctuations of the fuel within the fuel rail to be avoided.
  • the fuel rail may be formed by an extrusion or drawing process or by an additive manufacturing process.
  • the fuel rail assembly comprises a fuel rail 2 which comprises an elongate substantially tubular member forming a reservoir for fuel.
  • the fuel rail 2 is formed of a metal such as stainless steel.
  • the fuel rail 2 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.
  • the fuel rail has a sensor port 8 for a sensor (not shown) monitoring the fuel pressure in the fuel rail 2.
  • One or more fuel rail mounting brackets 10, by which the fuel rail 2 is secured to the engine, may be provided intermediate the length of the fuel rail 2 at a position determined by the installation conditions of the engine.
  • the fuel rail 2 may be formed by means of an extrusion or deep drawing process so that it has a substantially uniform cross-section along its length.
  • the fuel rail 2 of this embodiment is adapted to provide a direct fuel injection for a four-cylinder gasoline engine and has four fuel outlets 12 spaced along the fuel rail, the four outlets being substantially aligned along a common axis, which provide a mechanical and hydraulic connection to an inlet port of a fuel injector (not shown) for each cylinder.
  • a fuel injector not shown
  • 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 2 is formed with a uniform cross-section throughout its length by the use of an extrusion or deep drawing technique and is provided in the region of the fuel outlets 12 with a portion 14 of the peripheral wall 16 which has a locally increased thickness compared to the thickness of the remainder of the peripheral wall 16.
  • This thickened portion 14 of the fuel rail peripheral wall 16 extends longitudinally along the length of the fuel rail 2 and along the common axis of the fuel outlets 12.
  • the fuel outlets 14 are positioned in the thickened portion 14 of the peripheral wall 16. In this way, the stress forces in the region of the fuel outlets 12 are reduced and matched more closely to the forces acting on the remainder of the fuel rail 2.
  • the locally increased thickness of the peripheral wall may be provided using an internal rib 18 that extends longitudinally along the length of the fuel rail 2 and along the common axis of the fuel outlets 12.
  • the rib 18 may be integral with the peripheral wall 16 and formed with the fuel rail 2 by extrusion, for example.
  • the inner surface 20 of the rib 18 may be substantially flat and planar and form a chord with the inner surface of the fuel rail 2 which adjacent to the rib 18 is substantially circular.
  • the thickened portion 14 of the fuel rail 2 with a flat plane profile may have the form of a chord of a circle.
  • the flat planar surface 20 facilitates the machining of the holes of the fuel outlets 12 and the provision of chamfers for the holes on the flat surface 20. This has the advantage that the quality of the machining and the cleanliness of the process can be improved.
  • the fuel rail 2 with the local reinforcement in the region of the fuel outlets 12 and along the common axis of the fuel outlets 12 has the advantage that the effects of fatigue stress at the fuel outlets 12 are mitigate. Additionally, for a given operating pressure it is possible to form the bulk of the fuel rail 2 with a thinner wall thickness. This makes it possible to lower the weight of the fuel rail 2 or to enable the fuel rail 2 to operate with higher operating pressures and stresses without increasing the weight of the fuel rail. It also enables the interior volume of the fuel rail 2 to be substantially maintained without substantially increasing the overall size of the rail. This has operational advantages in that the volume of the fuel in the fuel rail 2 can be maintained in a space and cost efficient manner which facilitates reducing fluctuations of the pressure in the fuel rail 2 in operation. Also, the space required to fit the fuel rail 2 in a vehicle is reduced which provides a design advantage.

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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)
EP18185163.5A 2018-07-24 2018-07-24 Rampe de carburant destinée à un système d'injection de carburant et procédé de fabrication d'une telle rampe de carburant Ceased EP3599372A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP18185163.5A EP3599372A1 (fr) 2018-07-24 2018-07-24 Rampe de carburant destinée à un système d'injection de carburant et procédé de fabrication d'une telle rampe de carburant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18185163.5A EP3599372A1 (fr) 2018-07-24 2018-07-24 Rampe de carburant destinée à un système d'injection de carburant et procédé de fabrication d'une telle rampe de carburant

Publications (1)

Publication Number Publication Date
EP3599372A1 true EP3599372A1 (fr) 2020-01-29

Family

ID=63041865

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18185163.5A Ceased EP3599372A1 (fr) 2018-07-24 2018-07-24 Rampe de carburant destinée à un système d'injection de carburant et procédé de fabrication d'une telle rampe de carburant

Country Status (1)

Country Link
EP (1) EP3599372A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020112697A1 (en) * 2000-11-14 2002-08-22 Helmut Knoedl Fuel high pressure accumulator for fuel injection system of internal combustion engines
JP2004239212A (ja) * 2003-02-07 2004-08-26 Denso Corp 蓄圧式燃料噴射装置
US20110283973A1 (en) * 2010-05-18 2011-11-24 Aisan Kogyo Kabushiki Kaisha Fuel delivery pipe
EP3199793A1 (fr) * 2014-09-26 2017-08-02 Usui Co., Ltd. Tuyau d'alimentation pour essence
DE102016209423A1 (de) * 2016-05-31 2017-11-30 Robert Bosch Gmbh Hochdruckspeicher und Verfahren zur Herstellung eines Hochdruckspeichers
EP3253962A1 (fr) 2015-02-06 2017-12-13 Delphi International Operations Luxembourg S.à r.l. Procédé de fabrication d'une rampe commune

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020112697A1 (en) * 2000-11-14 2002-08-22 Helmut Knoedl Fuel high pressure accumulator for fuel injection system of internal combustion engines
JP2004239212A (ja) * 2003-02-07 2004-08-26 Denso Corp 蓄圧式燃料噴射装置
US20110283973A1 (en) * 2010-05-18 2011-11-24 Aisan Kogyo Kabushiki Kaisha Fuel delivery pipe
EP3199793A1 (fr) * 2014-09-26 2017-08-02 Usui Co., Ltd. Tuyau d'alimentation pour essence
EP3253962A1 (fr) 2015-02-06 2017-12-13 Delphi International Operations Luxembourg S.à r.l. Procédé de fabrication d'une rampe commune
DE102016209423A1 (de) * 2016-05-31 2017-11-30 Robert Bosch Gmbh Hochdruckspeicher und Verfahren zur Herstellung eines Hochdruckspeichers

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