EP3824174B1 - Common-rail-einspritzvorrichtung - Google Patents

Common-rail-einspritzvorrichtung Download PDF

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Publication number
EP3824174B1
EP3824174B1 EP19752733.6A EP19752733A EP3824174B1 EP 3824174 B1 EP3824174 B1 EP 3824174B1 EP 19752733 A EP19752733 A EP 19752733A EP 3824174 B1 EP3824174 B1 EP 3824174B1
Authority
EP
European Patent Office
Prior art keywords
injection well
injection
zone
cylindrical element
channel
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
EP19752733.6A
Other languages
English (en)
French (fr)
Other versions
EP3824174A1 (de
Inventor
Pierre-Yves GRIVEAU
Gilles DAUBORD
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.)
Duncha France SAS
Original Assignee
Duncha France SAS
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 Duncha France SAS filed Critical Duncha France SAS
Publication of EP3824174A1 publication Critical patent/EP3824174A1/de
Application granted granted Critical
Publication of EP3824174B1 publication Critical patent/EP3824174B1/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
    • F02M61/14—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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/28—Details of throttles in fuel-injection apparatus
    • 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
    • F02M2200/31—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements
    • F02M2200/315—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements for damping fuel pressure fluctuations
    • 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 invention relates to a common rail injection device for an internal combustion engine.
  • the injection devices of the state of the art comprise a common rail having a main chamber, an inlet orifice opening into the main chamber and intended to be connected to a fuel supply tube, a plurality of wells injection which are distributed along the common rail and are each intended to receive an injector and a plurality of conduits each allowing the main chamber to be connected to one of the injection wells.
  • the injection wells are offset from the main chamber of the common rail.
  • the geometric axis of the injection wells does not cross the main chamber of the common rail.
  • the machining is carried out transversely to the common rail through the main chamber of the common rail.
  • the injection devices are equipped with nozzles which are formed by a reduction in the fuel passage section so as to generate a pressure loss which makes it possible to dampen the pressure waves.
  • the first consists of fitting an axially drilled cylindrical element into the conduit connecting the main chamber of the common rail to the injection well. This fitting is particularly difficult to achieve, given the restricted accessibility of the conduits, for the aforementioned structures in which the injection wells are offset from the main chamber of the common rail.
  • the conduit connecting the main chamber to the injection well presents at the junction between said conduit and the injection well a weaker section.
  • the machining of this weaker section requires the use of a drill of small diameter but of significant length to reach the end of the conduit.
  • the use of a small drill bit over such a long length makes it fragile with a risk of generating numerous manufacturing rejects and defects in the finished product.
  • one of the aims of the present invention is to provide an injection device comprising a common rail, which makes it possible to obviate the above drawbacks.
  • Another aim of the invention is to provide such a device which is simple and inexpensive to produce.
  • the sprinkler function being carried out in a more easily accessible zone, namely in the bottom of the injection well and not in the conduit, said function can be carried out in a simpler and more reliable manner.
  • such an injection device may have one or more of the following characteristics.
  • the nozzle is a cylindrical element which is fitted into the bottom of the injection well and which provides a space for the passage of fuel from the conduit to the injector interface zone.
  • a cylindrical element forming a nozzle can thus be fitted more easily into the bottom of the injection well than when it must be fitted into the conduit connecting the main chamber to the bottom of the injection well.
  • the cylindrical element is force-fitted into the bottom of the injection well.
  • the bottom of the injection well has a diameter smaller than that of the injector interface zone. This facilitates the fitting of the cylindrical element forming a nozzle into the bottom of the injection well.
  • the nozzle comprises at least a first channel and a second channel opening into each other and opening respectively facing the injector interface zone and facing the conduit, the first channel and the second channel having a diameter smaller than that of the conduit.
  • the nozzle abuts against the end of the injection well. This ensures precise axial positioning of the cylindrical element along the first axis.
  • the cylindrical element comprises keying means making it possible to guarantee positioning of the nozzle relative to the bottom of the injection well in a relative position such that the second channel is directed facing the conduit.
  • the cylindrical element provides a fuel passage space between the conduit and a zone of the bottom provided between the cylindrical element and one end of the injection well, the cylindrical element further comprising a channel crossing oriented along the first axis, opening on the one hand into said bottom zone and, on the other hand, into the injector interface zone.
  • the through channel oriented along the first axis has a diameter smaller than that of the conduit.
  • the cylindrical element provides a fuel passage space between the conduit and a zone of the bottom provided between the cylindrical element and one end of the injection well, the cylindrical element further comprising a flat providing a space between the cylindrical element and a bottom wall of the injection well allowing the passage of fuel from said bottom zone to the injector interface zone.
  • the injection device 1 represents an injection device designated as a whole by the reference 1.
  • the injection device 1 comprises a common rail 2 which extends in a longitudinal direction.
  • the common rail 2 is hollow and thus defines a main chamber 4 of tubular shape, illustrated in the figure 2 , extending in the longitudinal direction of the common rail 2.
  • the common rail 2 is advantageously made in one piece, for example by a forging process.
  • the common rail 2 includes an inlet orifice 3 opening into the main chamber 4 of the common rail 2 and intended to be connected to a fuel supply tube, not illustrated.
  • the common rail 2 comprises injection wells 5 which are each intended to receive an injector 9, partially illustrated in the figure 2 .
  • Each of the injection wells 5 extends along a geometric axis A.
  • the injection wells 5 are offset relative to the main chamber 4. In other words, the geometric axis A of each injection well 5 does not pass through the main chamber 4.
  • Each injection well 5 has a bottom 5a and an injector interface zone 5b in which the injector 9 is mounted.
  • the bottom 5a like the injector interface zone 5b of each injection well 5 presents a general cylindrical shape.
  • the main chamber 4 of the common rail 2 is connected to each of the injection wells 5 by means of a conduit 6.
  • Each conduit 6 has a cylindrical shape extending along an axis B which intersects the axis A.
  • Each leads 6 opens, on the one hand, into the main chamber 4, and, on the other hand, into the bottom 5a of one of the injection wells 5 and thus makes it possible to conduct the fuel from the main chamber 4 towards said well. injection 5.
  • the conduit 6 opens laterally, that is to say at the level of the peripheral wall of the bottom 5a of the injection well 5.
  • each conduit 6 is machined transversely to the longitudinal axis of the common rail 2 and from the side of the common rail 2 opposite the injection wells. injection 5.
  • a through bore 7 is necessarily formed, in the common rail 2, facing said conduit 6.
  • the bore 7 extends coaxially to the geometric axis B of the conduit 6.
  • the diameter of conduit 6 is for example between 3 and 5 mm.
  • the axis B passes through the central axis of the main chamber 4.
  • the bore 7 is intended to be sealed in a sealed manner by means of a closing device, not shown.
  • the injection device 1 comprises a nozzle 8 provided in the bottom 5a of each of the injection wells 5.
  • the nozzle 8 aims to reduce the fuel passage section between the conduit 6 and the injector interface zone 5b of the injection well 5.
  • the nozzle 8 thus generates a pressure loss which makes it possible to dampen the pressure waves.
  • the nozzle 8 is a cylindrical element which is force-fitted into the bottom 5a of the injection well 5.
  • the nozzle 8 is for example made of stainless steel.
  • the bottom 5a has a diameter smaller than that of the injector interface zone 5b.
  • the nozzle 8 comprises a frustoconical portion 20 which is positioned, along the axis A, facing the conduit 6 and which thus allows the fuel to penetrate into the bottom 5a of the injection well 5, and more particularly in a zone located between the end 11 of the injection well 5 and the nozzle 8.
  • the nozzle 8 also includes a through channel 10, which is oriented along the axis A of the injection well 5 and thus makes it possible to conduct the fuel from the aforementioned bottom zone 5a from the injection well 5 towards the injector interface zone 5b.
  • channel 10 passes through nozzle 8 at its center.
  • the nozzle 8 comprises a through channel 10 which is oriented along the axis A of the injection well 5 and which passes through said nozzle 8.
  • the nozzle 8 further comprises one or more transverse channels 13 which pass through the nozzle 8 radially.
  • the channels 13 pass through the channel 10 and are advantageously perpendicular to said channel 10.
  • the nozzle 8 is oriented in the bottom 5a of the injection well 5 so that one of the channels 13 opens facing the conduit 6. Thanks to the plurality of channels 13, there is a greater number of positions making it possible to ensure relative positioning of the nozzle 8 relative to the injection well 5 in which one of the channels 13 opens facing the conduit 6.
  • the nozzle 8 comprises keying means making it possible to guarantee positioning of the nozzle 8 in a relative position such that one of the channels 13 is directed facing the conduit 6.
  • the coding means are formed by a visual indication provided on the lower surface of the nozzle 8.
  • the bottom 5a of the injection well and the nozzle 8 each have a singularity complementary geometry to ensure mechanical keying.
  • the nozzle 8 comprises a through channel 10 which is oriented along the axis A of the injection well 5 and which passes through said nozzle 8.
  • the nozzle 8 further comprises a blind channel 15 which is oriented in a radial orientation at the axis A, perpendicular to said channel 10.
  • channel 15 opens opposite conduit 6 and, on the other hand, it joins channel 10 so as to allow the passage of fuel from conduit 6 towards the zone d injector interface 5b of the injection well 5.
  • the nozzle 8 comprises keying means, as described above, making it possible to guarantee positioning of the nozzle in a position such that the channel 15 is directed in view of conduit 6.
  • the nozzle 8 comprises a channel 16 which is oriented along the axis A.
  • the channel 16 is blind, that is to say it only opens opposite the injector interface zone 5b of the injection well 5a.
  • the nozzle 8 further comprises another channel 15, also blind, which is oriented, in a radial orientation to the axis A, perpendicular to said channel 16.
  • the channel 15 opens opposite the conduit 6 and joins the channel 16 so as to allow the passage of fuel from conduit 6 to the injector interface zone 5b of the injection well 5.
  • the nozzle 8 is also likely to include keying means. Furthermore, in this embodiment, the nozzle 8 abuts against the end 11 of the injection well 5, which ensures correct positioning of the nozzle 8, and more particularly of the channel 15, along the A axis.
  • the channels 10, 13, 15, 16 have a diameter smaller than that of the conduit 6 in order to generate a pressure loss.
  • their diameter is between 0.75 to 1.5 mm.
  • the nozzle 8 does not have a channel but has a flat 8c extending over the entire length of said nozzle 8.
  • the nozzle 8 is fitted into the bottom 5a of the injection well 5 so as to maintain a space 18 between the conduit 6 and a zone located between the end 11 of the injection well 5 and the nozzle 8.
  • the flat 8c thus makes it possible to provide between the nozzle 8 and the cylindrical wall of the bottom 5a of the injection well 5 a space 19 authorizing the passage of fuel towards the injector interface zone 5b.
  • the axis A of the injection well 5 passes through the conduit 6 so that the bottom 5a of the injection well 5 opens into the conduit 6.
  • the bottom 5a of the injection well 5 which communicates the zone d
  • the injector interface 5b with the conduit 6 has a diameter smaller than that of the conduit 6 and that of the injector interface zone 5b.
  • the diameter of the bottom 5a of the injection well 5 is for example between 0.75 to 1.5 mm.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Claims (6)

  1. Vorrichtung zur Injektion (1), umfassend eine Common-Rail (2), die sich in Längsrichtung erstreckt und eine Hauptkammer (4) definiert, wobei die Common-Rail (2) umfasst:
    - einen Einlass (3), der in die Hauptkammer (4) mündet und dazu bestimmt ist, mit einem Kraftstoffversorgungsrohr verbunden zu werden,
    - mindestens einen Injektionsschacht (5), der sich entlang einer ersten Achse erstreckt, wobei der Injektionsschacht (5) einen Boden (5a) und eine Injektorschnittstellenzone (5b) umfasst, in die ein Injektor (9) montiert werden soll;
    - mindestens einen Querkanal (6), der sich entlang einer zweiten Achse erstreckt und einerseits in die Hauptkammer (4) und andererseits in den Boden (5a) des Injektionsschachts (5) mündet, um die Hauptkammer (4) mit dem Injektionsschacht (5) zu verbinden, wobei die erste und die zweite Achse eine Schnittlinie bilden; und
    - eine Düse (8), die im Boden (5a) des Injektionsschachts (5) angeordnet ist und den Kraftstoffdurchgangsquerschnitt zwischen der Leitung (6) und der Injektorschnittstellenzone (5b) des Injektionsschachts (5) verringert, und so konfiguriert ist, dass sie einen Druckverlust erzeugt, der die Druckwellen dämpft, wobei die Vorrichtung dadurch gekennzeichnet ist, dass die Düse (8) ein zylindrisches Element ist, das fest in den Boden (5a) des Injektionsschachts (5) eingepresst ist und einen Raum (10, 13, 15, 16, 18, 19) für den Durchgang von Kraftstoff aus der Leitung (6) in Richtung der Injektorschnittstellenzone (5b) bildet.
  2. Vorrichtung (1) nach Anspruch 2, wobei der Boden (5a) des Injektionsschachts (5) einen Durchmesser aufweist, der kleiner ist als der der Injektorschnittstellenzone (5b).
  3. Vorrichtung (1) nach Anspruch 1 oder 2, wobei die Düse (8) mindestens einen ersten Kanal (10, 16) und einen zweiten Kanal (13, 15) aufweist, die ineinander münden und jeweils gegenüber der Injektorschnittstellenzone (5b) bzw. gegenüber der Leitung (6) münden, wobei der erste Kanal und der zweite Kanal einen kleineren Durchmesser als die Leitung (6) aufweisen.
  4. Vorrichtung (1) nach Anspruch 3, wobei die Düse (8) am Ende (11) des Injektionsschachts (5) anliegt.
  5. Vorrichtung (1) nach Anspruch 1 oder 2, wobei das zylindrische Element einen Kraftstoffdurchgangsraum zwischen der Leitung (6) und einem Bodenbereich (5a), der zwischen dem zylindrischen Element und einem Ende (11) des Einspritzschachts (5) angeordnet ist, bereitstellt, wobei das zylindrische Element weiterhin einen Durchgangskanal (10) umfasst, der entlang der ersten Achse ausgerichtet ist und einerseits in den Bodenbereich (5a) und andererseits in die Injektorschnittstellenzone (5b) mündet.
  6. Vorrichtung (1) nach Anspruch 1 oder 2, wobei das zylindrische Element einen Kraft-stoffdurchgangsraum zwischen der Leitung (6) und einem Bodenbereich (5a), der zwischen dem zylindrischen Element und einem Ende (11) des Einspritzschachts (5) angeordnet ist, be-reitstellt, wobei das zylindrische Element weiterhin eine Abflachung (8c) aufweist, die zwischen dem zylindrischen Element und einer Bodenwand (5a) des Injektionsschachts (5) einen Raum (19) bildet, der den Durchgang des Kraftstoffs von dem Bodenbereich (5a) zu der Injektorschnittstellenzone (5b) zulässt
EP19752733.6A 2018-07-16 2019-07-15 Common-rail-einspritzvorrichtung Active EP3824174B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1856543A FR3083830B1 (fr) 2018-07-16 2018-07-16 Dispositif d'injection a rampe commune
PCT/FR2019/051770 WO2020016513A1 (fr) 2018-07-16 2019-07-15 Dispositif d'injection a rampe commune

Publications (2)

Publication Number Publication Date
EP3824174A1 EP3824174A1 (de) 2021-05-26
EP3824174B1 true EP3824174B1 (de) 2023-09-13

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19752733.6A Active EP3824174B1 (de) 2018-07-16 2019-07-15 Common-rail-einspritzvorrichtung

Country Status (4)

Country Link
EP (1) EP3824174B1 (de)
JP (1) JP2021535322A (de)
FR (1) FR3083830B1 (de)
WO (1) WO2020016513A1 (de)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE60115629T2 (de) * 2000-03-21 2006-06-29 Siemens Ag Brennstoffeinspritzvorrichtung zur befestigung und ausrichtung eines brennstoffeinpritzventiles zu einem brennstoffverteiler
JP2001349266A (ja) * 2000-06-08 2001-12-21 Toyota Motor Corp 燃料噴射弁
JP3694228B2 (ja) * 2000-09-18 2005-09-14 株式会社オティックス デリバリパイプ
JP2006233858A (ja) * 2005-02-24 2006-09-07 Denso Corp コモンレール式燃料噴射装置
DE102005061882A1 (de) * 2005-12-23 2007-07-05 Robert Bosch Gmbh Vorrichtung zur Dämpfung von Druckschwingungen in einem Hochdrucksammelraum
DE102007049357A1 (de) * 2007-10-15 2009-04-16 Robert Bosch Gmbh Brennstoffeinspritzvorrichtung
JP5823336B2 (ja) * 2012-04-04 2015-11-25 株式会社オティックス 燃料分配管
DE102012206241A1 (de) * 2012-04-17 2013-10-17 Robert Bosch Gmbh Vorrichtung zum Niederhalten eines Ventils zum Zumessen von Kraftstoff
DE102013203537A1 (de) * 2013-03-01 2014-09-04 Robert Bosch Gmbh Brennkraftmaschine

Also Published As

Publication number Publication date
JP2021535322A (ja) 2021-12-16
EP3824174A1 (de) 2021-05-26
WO2020016513A1 (fr) 2020-01-23
FR3083830B1 (fr) 2021-10-01
FR3083830A1 (fr) 2020-01-17

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