EP3653866B1 - Ensemble de rampe de carburant pour un système d'injection de carburant d'un moteur à combustion interne et procédé de fabrication d'un ensemble de rampe de carburant - Google Patents

Ensemble de rampe de carburant pour un système d'injection de carburant d'un moteur à combustion interne et procédé de fabrication d'un ensemble de rampe de carburant Download PDF

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Publication number
EP3653866B1
EP3653866B1 EP18206634.0A EP18206634A EP3653866B1 EP 3653866 B1 EP3653866 B1 EP 3653866B1 EP 18206634 A EP18206634 A EP 18206634A EP 3653866 B1 EP3653866 B1 EP 3653866B1
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EP
European Patent Office
Prior art keywords
fuel rail
fuel
sensor port
internal combustion
combustion engine
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.)
Active
Application number
EP18206634.0A
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German (de)
English (en)
Other versions
EP3653866A1 (fr
Inventor
Giandomenico Serra
Gisella Di Domizio
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
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Vitesco Technologies GmbH
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Publication date
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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
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/24—Fuel-injection apparatus with sensors
    • 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
    • F02M2200/8061—Fuel injection apparatus manufacture, repair or assembly involving press-fit, i.e. interference or friction fit
    • 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

Definitions

  • the fuel rail may include a sensor port for a fuel pressure sensor which is brazed to the exterior of the fuel rail.
  • Such ports as in JP 2013 217328 A , increase the space required in the engine bay for the fuel rail assembly.
  • the sensor port has a body, which may be substantially tubular or cylindrical and has a bore for a sensor.
  • a body which may be substantially tubular or cylindrical and has a bore for a sensor.
  • the sensor port may be sized and shaped to accommodate a sensor such as a fuel pressure sensor.
  • the position of the sensor port in the fuel rail may be selected depending on the application, for example, depending on the position in the fuel rail that the pressure of the fuel should be measured. In some embodiments more than one sensor port may be provided. This enables the fuel pressure to be measured at different positions within the fuel rail.
  • the sensor positioned in the sensor port is not limited to a fuel pressure sensor. Sensors for sensing other parameters of the fuel, for example, temperature may also be provided.
  • the location of at least part of the sensor port within the interior volume of the fuel rail provides an obstacle to the flow of fuel that may be used to dampen fluctuations in fuel pressure. Pressure variations may have adverse effects on the performance of the injectors which can lead to excessive fuel injection or too little fuel injection with the risk of causing potential damage to the engine. By dampening the pressure fluctuations, an improved harmonization of the internal pressure of the fuel rail is provided so as to better control the pressure of the fuel at the injector and better control the combustion process. Emissions can be reduced.
  • At least 50% or 75% of the volume of the sensor port is positioned within the interior volume of the fuel rail.
  • the opening of the sensor port through which the sensor is inserted is flush with the exterior surface of the fuel rail so that the sensor port is positioned essentially entirely within the interior volume of the fuel rail, in particular within the tubular body.
  • the disclosure provides a fuel rail assembly for a fuel injection system for an internal combustion engine, in which the sensor port has a generally cylindrical bore adapted to receive a sensor and has an axis at an angle to the longitudinal axis of the fuel rail, i.e. the axis of the sensor port is not parallel to the longitudinal axis of the fuel rail so that the sensor can be described as a radial sensor.
  • the axis of the sensor port is at 90° to the longitudinal axis of the fuel rail. The angle of the axis of the sensor port with respect to the longitudinal axis of the fuel rail may be selected depending on the engine design and/or position at which the sensor head should be positioned.
  • the sensor port may be provided as a separate component that is joined to the fuel rail, in particular inserted into a hole in the outer wall of the fuel rail so that it is located at least partially within the interior volume of the fuel rail.
  • This separate component can be attached to the fuel rail in various ways in a fluid-tight manner.
  • the sensor port is provided with a peripheral flange on its outer end which has a diameter larger than the diameter of the hole in the fuel rail, which serves to locate the sensor port on the fuel rail wall.
  • the peripheral flange may have a peripheral slot adjacent the exterior surface of the fuel rail. The slot is adapted to receive a brazing paste or brazing ring by which the sensor port is secured to the fuel rail.
  • the peripheral slot is formed in the wall of the fuel rail.
  • the sensor port is located with a press fit in the hole in the fuel rail wall.
  • the sensor port is arranged to abut the opposing interior surface of the fuel rail thereby to locate the sensor port in the desired position.
  • the sensor port may extend across the interior diameter of the fuel rail to abut the opposing interior surface of the fuel rail.
  • the axis of the sensor port extends perpendicularly to the longitudinal axis of the fuel rail.
  • the sensor portion may extend at a tangent to the interior wall and not cross the longitudinal axis of the fuel rail.
  • the sensor port is integrally formed with the tubular body.
  • the fuel rail assembly may be formed by an additive manufacturing technology in order to form the sensor port integrally with the tubular body.
  • the fuel rail may be formed of a synthetic plastics material or a metal such as stainless steel or other alloy.
  • the additive manufacturing technology uses alternative materials for certain parts of the fuel rail assembly.
  • Additive manufacturing techniques may be used to build up the fuel rail layer by layer.
  • the elongate body and the sensor port may be built up layer by layer using 3D (Three-dimensional) printing or Powder Bed Fusion or Directed Energy Deposition.
  • the fuel rail may be built up layer by layer by movement of the metal jet print head, laser or electron beam controlled according to a three dimensional model of the fuel rail.
  • the sensor port is positioned partially or completely inside the main gallery of the fuel rail.
  • a fuel rail and a fuel rail assembly with reduced overall dimensions are provided which simplifies installation of the fuel rail in the engine environment.
  • the fuel rail is applicable for embodiments in which the sensor port is not parallel to the main or longitudinal axis of the fuel rail or main gallery, for example the sensor port protrudes radially from the longitudinal axis. Additionally, the weight and cost of the fuel rail is reduced due to reduction in the use of the material.
  • the sensor port may be brazed to the main gallery or fuel rail.
  • the sensor port can be positioned with respect to its axis by, for example, a press fit or a loose fit and attached to the main gallery by welding which may be inside the main gallery, or with a mechanical stop.
  • the mechanical stop may be achieved by the sensor port having a portion having an external diameter larger than the diameter of the hole in the wall of the fuel rail which is used to position the sensor port with respect to the main gallery.
  • the mechanical stop may be, for example, a flange at the opening to the sensor port.
  • the bottom surface of the sensor port may act as a mechanical stop.
  • the lower part of the sensor port is shaped so as to affect the flow of the fluid to provide a desired flow.
  • the position of the sensor port within the fuel rail as well as the shape of the sensor port including the bottom part can provide benefits in terms of reducing pressure oscillation by interrupting or splitting the total interior volume.
  • two flat parallel surfaces are provided in the external portion of the sensor, which allow the application of the sensor tightening torque without stressing the brazed connection between the sensor port and the fuel rail.
  • a sensor port 18 is secured in the wall of the fuel rail 4 so as to be located at least partially, and preferably entirely, within the volume of the reservoir in the fuel rail 4 so as to be substantially flush with the exterior surface of the fuel rail 4.
  • FIG. 2A and 2B there is shown a cross-sectional side view of the fuel rail assembly 2 of Figure 1 showing a sensor port 18 located within the interior volume of the fuel rail 4 which is secured to the wall 20 of the fuel rail.
  • the exterior surface of the sensor port 18 located in the fuel rail 4 it is possible for the exterior surface of the sensor port 18 located in the fuel rail 4 to be shaped so as to assist damping pressure fluctuations occur the fuel being pumped into the fuel rail 4.
  • the sensor port 18 has a generally cylindrical shape terminating at its lower end in a frusto-conical profile.
  • the sensor port 18 has a cylindrical chamber open at its external end which lies substantially flush with the exterior surface of the fuel rail 4.
  • the sensor port 18 is adapted to receive a sensor (not shown), such as a fuel pressure sensor.
  • the sensor port 18 is located almost entirely within the volume of the fuel rail 4.
  • the internal end of the sensor port 18 is clear of and spaced apart from the opposite interior surface of the wall 20 of the fuel rail 4.
  • the sensor port 18 abuts the opposing interior surface of the wall 20 of the fuel rail 4, which serves to locate the sensor port 18 in the correct position relative to the exterior surface of the fuel rail 4.
  • FIG. 3A there is shown sectional side views of part of the fuel rail 4 and a sensor port 18 secured in the wall 20 of the fuel rail.
  • the sensor port 18 is a press fit in a hole in the wall 20 where it is further secured by brazing.
  • the sensor port 18 has a peripheral groove or slot 22 which is aligned with the wall 20 of the fuel rail.
  • the slot 22 is filled with a brazing paste or a brazing ring such as a copper ring to facilitate securely brazing the sensor port 18 to the wall 20 of the fuel rail 4.
  • the slot 22 is formed in the wall 20 of the fuel rail 4 and in the same way as the embodiment of Figure 3B , the slot 22 is filled with a brazing paste or brazing ring to facilitate securely brazing the sensor port 18 to the wall 20.
  • the sensor port 18 has a peripheral flange 24 which has a diameter larger than the diameter of the hole in which the sensor port 18 sits so that the flange 24 abuts the outer surface 26 of the wall 20 of the fuel rail 4 to locate the sensor port 18 in the desired position.
  • the sensor port 18 is a press fit in the hole in the wall 20 where it is preferably secured by brazing.
  • the peripheral flange 24 has a peripheral undercut which forms a slot 22 between the outer surface 26 of the wall 20 and the lower surface of the peripheral flange 24.
  • the slot 22 may be filled with a brazing paste or a brazing ring to facilitate the secure brazing of the sensor port 18 to the wall 20 of the fuel rail.
  • a peripheral slot 22 is formed in the outer surface 26 of the wall 20 of the fuel rail 4 and the slot 22 is filled with a brazing paste or brazing ring which abuts the underside of the peripheral flange 24 to facilitate the secure brazing of the sensor port 18 to the wall 20 of the fuel rail 4.
  • FIG. 5 there is shown an alternative construction in which the sensor port 18 is formed integrally with the wall 20 of the fuel rail 4.
  • This integral construction may be formed by an additive manufacturing technology.
  • additive manufacturing it is possible to adjust the wall thickness of the wall 20 and the sensor port 18 by forming a radiussed fillet in the region of the junction between the two portions, i.e. the sensor port 18 and the wall 20.
  • This curved contour may be used to prevent a stress concentration point and to eliminate the possibility of leaks occurring at the junction between the sensor port 18 and the wall 20 of the fuel rail, which may occur when two separate components are brazed together.
  • the sensor port 18 is positioned at least partially and, in some embodiments, substantially entirely within the interior volume of the fuel rail 4. Therefore, the space occupied by the fuel rail assembly 2 is reduced.

Landscapes

  • 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)

Claims (12)

  1. Ensemble à rampe de carburant pour un système d'injection de carburant pour un moteur à combustion interne, ayant une rampe de carburant (4) comprenant un corps allongé généralement tubulaire formant un réservoir de carburant et ayant un orifice d'entrée de carburant (6) et au moins un ou plusieurs orifices de sortie de carburant (10) et un orifice de capteur (18), l'orifice de capteur (18) étant situé au moins partiellement à l'intérieur du volume intérieur de la rampe de carburant (4),
    caractérisé en ce que l'orifice de capteur (18) est situé dans un trou dans une paroi (20) de la rampe de carburant (4) afin de se trouver sensiblement au ras de la surface extérieure de la rampe de carburant (4).
  2. Ensemble à rampe de carburant pour un système d'injection de carburant pour un moteur à combustion interne, selon la revendication 1, dans lequel l'orifice de capteur (18) a un alésage généralement cylindrique adapté pour recevoir un capteur et a un axe à un angle par rapport à l'axe longitudinal de la rampe de carburant (4).
  3. Ensemble à rampe de carburant pour un système d'injection de carburant pour un moteur à combustion interne, selon la revendication 2, dans lequel l'axe de l'orifice de capteur (18) est à 90° par rapport à l'axe longitudinal de la rampe de carburant (4).
  4. Ensemble à rampe de carburant pour un système d'injection de carburant pour un moteur à combustion interne, selon l'une quelconque des revendications 1 à 3, dans lequel l'orifice de capteur (18) est brasé sur la paroi de la rampe de carburant (4).
  5. Ensemble à rampe de carburant pour un système d'injection de carburant pour un moteur à combustion interne selon la revendication 4, dans lequel une fente périphérique (22) ou un épaulement adapté pour recevoir une pâte ou bague de brasage est situé à la jonction entre la rampe de carburant paroi (20) et l'orifice de capteur (18).
  6. Ensemble à rampe de carburant pour un système d'injection de carburant pour un moteur à combustion interne, selon la revendication 5, dans lequel la fente (22) est prévue dans la paroi de la rampe de carburant (4) de façon adjacente à l'orifice de capteur (18) pour recevoir une pâte ou bague de brasage.
  7. Ensemble à rampe de carburant pour un système d'injection de carburant pour un moteur à combustion interne, selon l'une quelconque des revendications 1 à 6, dans lequel l'orifice de capteur (18) est pourvu d'une bride périphérique (24) sur son extrémité extérieure qui a un diamètre supérieur au diamètre du trou, laquelle bride sert à positionner l'orifice de capteur (18) sur la paroi de rampe de carburant (20).
  8. Ensemble à rampe de carburant pour un système d'injection de carburant pour un moteur à combustion interne, selon la revendication 7, dans lequel la bride périphérique (24) a une fente périphérique (22) adjacente à la surface extérieure de la rampe de carburant (4), adaptée pour recevoir une pâte de brasage ou une bague de brasage par laquelle l'orifice de capteur (18) est fixé à la rampe de carburant (4).
  9. Ensemble à rampe de carburant pour un système d'injection de carburant pour un moteur à combustion interne, selon la revendication 7, dans lequel la fente périphérique (22) est formée dans la paroi (20) de la rampe de carburant (4).
  10. Ensemble à rampe de carburant pour un système d'injection de carburant pour un moteur à combustion interne, selon l'une quelconque des revendications précédentes, dans lequel l'orifice de capteur (18) est situé, avec un ajustement avec serrage, dans le trou dans la rampe de carburant paroi (24).
  11. Ensemble à rampe de carburant pour un système d'injection de carburant pour un moteur à combustion interne, selon l'une quelconque des revendications précédentes, dans lequel la rampe de carburant (4) est formée d'un matériau plastique synthétique ou d'un métal tel qu'un acier inoxydable ou autre alliage.
  12. Procédé de formation d'un ensemble à rampe de carburant selon l'une quelconque des revendications précédentes en utilisant une technologie de fabrication additive.
EP18206634.0A 2018-11-16 2018-11-16 Ensemble de rampe de carburant pour un système d'injection de carburant d'un moteur à combustion interne et procédé de fabrication d'un ensemble de rampe de carburant Active EP3653866B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP18206634.0A EP3653866B1 (fr) 2018-11-16 2018-11-16 Ensemble de rampe de carburant pour un système d'injection de carburant d'un moteur à combustion interne et procédé de fabrication d'un ensemble de rampe de carburant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18206634.0A EP3653866B1 (fr) 2018-11-16 2018-11-16 Ensemble de rampe de carburant pour un système d'injection de carburant d'un moteur à combustion interne et procédé de fabrication d'un ensemble de rampe de carburant

Publications (2)

Publication Number Publication Date
EP3653866A1 EP3653866A1 (fr) 2020-05-20
EP3653866B1 true EP3653866B1 (fr) 2021-09-01

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EP18206634.0A Active EP3653866B1 (fr) 2018-11-16 2018-11-16 Ensemble de rampe de carburant pour un système d'injection de carburant d'un moteur à combustion interne et procédé de fabrication d'un ensemble de rampe de carburant

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Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007016668A (ja) * 2005-07-06 2007-01-25 Usui Kokusai Sangyo Kaisha Ltd 直噴ガソリンエンジン用燃料レール
JP5510992B2 (ja) * 2008-06-30 2014-06-04 臼井国際産業株式会社 高圧直噴内燃機関用燃料レール及びその製造方法
DE102008035494B4 (de) * 2008-07-30 2022-10-27 Mercedes-Benz Group AG Railbaugruppe einer Kraftstoffeinspritzanlage
DE102012205397B4 (de) * 2012-04-03 2017-07-06 Kendrion (Villingen) Gmbh Einrichtung für die Zufuhr von Kraftstoff zu einem Einspritzmotor
JP5891094B2 (ja) * 2012-04-11 2016-03-22 マルヤス工業株式会社 ダンパー機能を備えた燃料デリバリパイプ
US10208723B2 (en) * 2016-05-25 2019-02-19 Hi-Vol Products Threaded fuel rails
DE102017205691A1 (de) * 2017-04-04 2018-10-04 Robert Bosch Gmbh Kraftstoff-Hochdruckspeicher

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