EP2852754B1 - Injecteur d'un système d'injection de carburant - Google Patents

Injecteur d'un système d'injection de carburant Download PDF

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Publication number
EP2852754B1
EP2852754B1 EP13718835.5A EP13718835A EP2852754B1 EP 2852754 B1 EP2852754 B1 EP 2852754B1 EP 13718835 A EP13718835 A EP 13718835A EP 2852754 B1 EP2852754 B1 EP 2852754B1
Authority
EP
European Patent Office
Prior art keywords
pressure
bore
resonator
injector
accumulator
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.)
Not-in-force
Application number
EP13718835.5A
Other languages
German (de)
English (en)
Other versions
EP2852754A1 (fr
Inventor
Franz Guggenbichler
Martin Bernhaupt
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2852754A1 publication Critical patent/EP2852754A1/fr
Application granted granted Critical
Publication of EP2852754B1 publication Critical patent/EP2852754B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • 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
    • F02M55/008—Arrangement of fuel passages inside 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
    • 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
    • F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for
    • 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
    • F02M2200/40—Fuel-injection apparatus with fuel accumulators, e.g. a fuel injector having an integrated fuel accumulator
    • 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
    • F02M2200/8076—Fuel injection apparatus manufacture, repair or assembly involving threaded members
    • 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
    • F02M2200/852—Mounting of fuel injection apparatus provisions for mounting the fuel injection apparatus in a certain orientation, e.g. markings or notches

Definitions

  • the invention relates to an injector of a modular common rail fuel injection system with a high-pressure accumulator integrated in the injector body, wherein the injector has an injection nozzle with axially displaceable guided, surrounded by a nozzle chamber nozzle needle, the high pressure accumulator with the nozzle chamber connecting high pressure bore, a parallel to the high pressure bore Resonator bore which communicates with the injection nozzle and opens via a resonator in the high-pressure accumulator, and has a holding body which is frontally screwed to the high-pressure accumulator forming member, in particular a storage tube and through which the high-pressure bore and the resonator bore.
  • Injection injectors of this type are used in modular common rail systems, which are characterized in that a part of the existing storage volume in the system is present in the injector itself.
  • Modular common-rail systems are used in particularly large engines, in which the individual injectors may be mounted at a considerable distance from each other.
  • the sole use of a common rail for all injectors is not useful in such engines, as it would come due to the long lines during injection to a massive slump in Ein-injection pressure, so with prolonged injection duration, the injection rate would noticeably break. In such engines, it is therefore intended to arrange a high-pressure accumulator inside each injector.
  • each injector has its own high-pressure accumulator and thus can be used as a stand-alone module.
  • a high-pressure accumulator is not a common line to understand, but it is at a high-pressure accumulator to a pressure-resistant vessel with an inlet and outlet, whose diameter is significantly increased compared to the high pressure lines, thus from the High-pressure accumulator can be discharged a certain amount of injection, without causing an immediate pressure drop.
  • WO 2007/143768 A1 One way of reducing pressure pulsations is the WO 2007/143768 A1 can be seen, wherein a parallel to the high-pressure line between the injection nozzle and high-pressure accumulator switched resonator is provided, the high-pressure accumulator side has a resonator.
  • the resonator throttle is preferably arranged at the inlet of the resonator line into the high-pressure accumulator.
  • the resonator bore is first drilled in the form of a blind hole with a diameter of eg 3 mm from one side of the holding body ago. Thereafter, the resonator throttle is drilled, for example, with a diameter of 0.7 - 0.9 mm from the opposite side, this hole should open as central as possible in the resonator bore for reasons of high pressure resistance.
  • the axis of the resonator bore should thus coincide with the axis of the resonator choke.
  • the invention therefore aims to realize the described resonator function in injectors with longer high-pressure wells in a structurally simple manner, without significantly impairing the high-pressure resistance.
  • the invention essentially provides, starting from an injector of the type mentioned above, that an end portion of the high-pressure bore facing the high-pressure accumulator and an end portion of the resonator bore facing the high-pressure accumulator and having the resonator throttle is embodied in a separate component which extends between the holding body and the storage tube is inserted and fixed by the screwing of the holding body and storage tube.
  • the separate component is made shorter than the holding body, so for example. is formed with an axial length of less than 100mm, preferably less than 50 mm, more preferably less than 30mm. At most, an offset occurs at the transition between the resonator bore embodied in the holding body and the end portion of the resonator bore executed in the separate component, which is less critical with regard to the high-pressure resistance.
  • the separate component is in this case held only by the axial force generated during screwing of the holding body with the storage tube and clamped between these two components without the need for further fasteners as it were.
  • a preferred embodiment of the invention provides that the holding body and the separate component are secured against rotation by means of an axial pin.
  • the separate component carries a conical sealing surface which cooperates with a formed on a shoulder of the storage tube conical mating surface of the storage tube.
  • the separate component preferably has a planar sealing surface which cooperates with the planar end face of the holding body.
  • a preferred embodiment provides that the two end sections converge towards one another.
  • the two end sections open into a blind hole formed in the separate component.
  • the two end sections can also run parallel to one another.
  • the separate component is designed as a plate.
  • the resonator throttle is arranged at the inlet of the resonator bore in the high-pressure accumulator.
  • the resonator choke is thus formed in the separate component.
  • the resonator throttle can be designed in different lengths.
  • the resonator choke can be made relatively short so that it extends only over a short axial section, in particular via an end section of the separate component, in particular the plate, facing the high-pressure accumulator.
  • the resonator choke can extend through the separate component, in particular the plate, so that its length corresponds to the axial extension of the separate component, in particular the plate.
  • the inventive design is particularly advantageous for injectors to bear, in which the nozzle needle for controlling its opening and closing movement of the prevailing in a fuel-pressurized control chamber pressure in the axial direction can be acted upon, wherein the control chamber with a inlet throttle having inlet channel and an outlet channel having a flow channel is in communication and at least one of the inlet or outlet channel opening or closing control valve provided is, with which the pressure in the control chamber is controlled, that the inlet throttle and the outlet throttle are formed in a throttle plate, that the control valve is formed in a valve plate and that the high-pressure bore and the resonator bore, the valve plate and the throttle plate prevail.
  • the injector is usually designed such that an injector and / or holding body accommodating the high-pressure accumulator, the valve plate, the throttle plate and the injection nozzle are held together by a nozzle retaining nut.
  • the high-pressure bore and the resonator bore extend through the holding body, the valve plate and the throttle plate and thereby connect the high-pressure accumulator with the injection nozzle.
  • the length of the resonator bore is preferably matched to the length of the high-pressure bore so that the pressure oscillations induced by the injector mutually weaken or extinguish each other.
  • the length of the resonator bore between the injection nozzle and the resonator throttle as well as the length of the high-pressure bore between the injection nozzle and the inlet of the high-pressure bore into the pressure accumulator are each preferably an integer multiple of the wavelength of the pressure oscillation induced by the injection nozzle.
  • the length of the resonator bore between the nozzle front chamber and the resonator throttle preferably corresponds substantially to the length of the high-pressure bore between the nozzle front chamber and the inlet of the high-pressure bore into the pressure accumulator.
  • FIG. 1 schematically a cross section of an equipped with a high-pressure accumulator injector according to the prior art
  • Fig. 2 a detailed representation of the junction region of the resonator in the high-pressure accumulator.
  • an injector 1 having an injector 2, a throttle plate 3, a valve plate 4, a holding body 5 and a high-pressure accumulator 6, wherein a screwed to the holding body 5 nozzle retaining nut 7, the injection nozzle 2, the throttle plate 3 and the valve plate 4 together.
  • the solenoid valve 13 is closed, so that high pressure fuel from the high-pressure accumulator 6 via the high-pressure bore 8, the cross-connection 9 and the inlet throttle 10 flows into the control chamber 11 of the injection nozzle 2, the outflow from the control chamber 11 via the outlet throttle 12 but blocked at the valve seat of the solenoid valve 13 is.
  • a resonator is used. This consists of a resonator 20, which has the same length and possibly the same diameter as the high-pressure bore 8, and a resonator 21, which is attached to the memory-side end of the resonator 20 and connects them to the high-pressure accumulator 6.
  • the solenoid valve 13 When the solenoid valve 13 is closed, the pressure pulse generated at the nozzle seat 16 is propagated via the nozzle chamber 19 into the high-pressure bore 8 and the resonator bore 20.
  • FIG. 2 shows a disposed between the storage tube 25, the high-pressure accumulator 6 and the holding body 5 plate 23, which represents the inventively provided separate component.
  • the plate 23 has a conical sealing surface 24 which cooperates with a formed on a shoulder 26 of the storage tube 25 conical mating sealing surface.
  • the shoulder 26 of the storage tube 25 is connected via an annular groove-like recess 27 with a thin-walled, provided with an internal thread 28 portion 29 of the storage tube 25.
  • the plate 23 is inserted between the holding body 5 and the storage tube 25 and fixed by the screw connection of these two components.
  • the plate 23 is secured by means of at least one pin 30 against rotation.
  • a ring seal 36 provides an additional seal.
  • an end portion 32 of the high-pressure bore 8 and an end portion 33 of the resonator bore 20 is now formed.
  • the two end portions extend obliquely to the injector 34 and converge toward a high-pressure accumulator-side blind hole 35, in which both end portions 32, 33 open.
  • the end section 33 of the resonator bore 20 opens into the high-pressure accumulator 6 via the resonator throttle 21.
  • the end section 32 merges into the high-pressure bore 8 and the end section 3 into the resonator bore.

Claims (8)

  1. Injecteur d'un système d'injection de carburant modulaire à rampe commune, comprenant un accumulateur haute pression intégré dans le corps d'injecteur, l'injecteur présentant une buse d'injection avec un pointeau de buse guidé de manière déplaçable axialement dans celle-ci, entouré par un espace de buse, un alésage haute pression reliant l'accumulateur haute pression à l'espace de buse, un alésage de résonateur monté en parallèle avec l'alésage haute pression, qui est en liaison avec la buse d'injection et qui débouche par le biais d'un étranglement de résonateur dans l'accumulateur haute pression, et un corps de fixation qui est vissé du côté frontal avec le composant formant l'accumulateur haute pression, en particulier le tube d'accumulateur, et à travers lequel s'étendent l'alésage haute pression et l'alésage de résonateur, caractérisé en ce qu'une portion d'extrémité (32) de l'alésage haute pression (8) tournée vers l'accumulateur haute pression (6) et une portion d'extrémité (33) de l'alésage de résonateur (20) tournée vers l'accumulateur haute pression (6) et présentant l'étranglement de résonateur (21) sont réalisées dans un composant séparé (23) qui est introduit entre le corps de fixation (5) et le tube d'accumulateur (25) et qui est fixé par le vissage du corps de fixation (5) et du tube d'accumulateur (25).
  2. Injecteur selon la revendication 1, caractérisé en ce que le composant séparé (23) porte une surface d'étanchéité conique (24) qui coopère avec une surface d'étanchéité conique conjuguée du tube d'accumulateur (25) réalisée au niveau d'un épaulement (26) du tube d'accumulateur (25).
  3. Injecteur selon la revendication 1 ou 2, caractérisé en ce que le composant séparé (23) présente au niveau du côté frontal tourné vers le corps de fixation (5) une surface d'étanchéité plane qui coopère avec le côté frontal plan du corps de fixation (5).
  4. Injecteur selon la revendication 1, 2 ou 3, caractérisé en ce que le corps de fixation (5) et le composant séparé (23) sont bloqués en rotation au moyen d'une goupille axiale (30).
  5. Injecteur selon l'une quelconque des revendications 1 à 4, caractérisé en ce que les deux portions d'extrémité (32, 33) convergent l'une vers l'autre.
  6. Injecteur selon l'une quelconque des revendications 1 à 5, caractérisé en ce que les deux portions d'extrémité (32, 33) débouchent dans un trou borgne (35) réalisé dans le composant séparé (23).
  7. Injecteur selon l'une quelconque des revendications 1 à 6, caractérisé en ce que l'étranglement de résonateur (21) s'étend à travers le composant séparé (23).
  8. Injecteur selon l'une quelconque des revendications 1 à 7, caractérisé en ce que le pointeau de buse (15), pour la commande de son mouvement d'ouverture et de fermeture, peut être sollicité dans la direction axiale par la pression régnant dans un espace de commande (11) pouvant être alimenté en carburant sous pression, l'espace de commande (11) étant en liaison avec un canal d'alimentation (9) présentant un étranglement d'alimentation (10) et un canal de sortie présentant un étranglement de sortie (12) et au moins une soupape de commande (13) ouvrant ou fermant le canal d'alimentation ou de sortie étant prévue, avec laquelle la pression dans l'espace de commande (11) est commandée.
EP13718835.5A 2012-05-22 2013-04-24 Injecteur d'un système d'injection de carburant Not-in-force EP2852754B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT6012012A AT512960B1 (de) 2012-05-22 2012-05-22 Injektor eines modularen Common-Rail-Kraftstoffeinspritzsystems
PCT/EP2013/058491 WO2013174601A1 (fr) 2012-05-22 2013-04-24 Injecteur d'un système d'injection de carburant

Publications (2)

Publication Number Publication Date
EP2852754A1 EP2852754A1 (fr) 2015-04-01
EP2852754B1 true EP2852754B1 (fr) 2016-12-21

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP13718835.5A Not-in-force EP2852754B1 (fr) 2012-05-22 2013-04-24 Injecteur d'un système d'injection de carburant

Country Status (3)

Country Link
EP (1) EP2852754B1 (fr)
AT (1) AT512960B1 (fr)
WO (1) WO2013174601A1 (fr)

Families Citing this family (7)

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Publication number Priority date Publication date Assignee Title
GB714502A (en) * 1951-06-15 1954-09-01 Ici Ltd Improvements in or relating to plastic articles reinforced with fibrous materials comprising aromatic polyesters
US9644590B2 (en) * 2014-01-31 2017-05-09 Cummins Inc. Fuel injection pressure pulsation dampening system
GB201504729D0 (en) * 2015-03-20 2015-05-06 Delphi International Operations Luxembourg S.�.R.L. Control valve body
CN107035586B (zh) * 2017-01-18 2023-01-03 哈尔滨工程大学 一种带液力反馈的微动态回油谐振式电控喷油器
CN106523222A (zh) * 2017-01-18 2017-03-22 哈尔滨工程大学 一种带有刻沟的双路进油谐振孔板式电控喷油器
DE102021200154A1 (de) * 2021-01-11 2022-07-14 Robert Bosch Gesellschaft mit beschränkter Haftung Kraftstoffeinspritzvorrichtung
CN114165376B (zh) * 2021-12-17 2023-06-30 中国船舶集团有限公司第七一一研究所 喷油器以及喷油方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10060812A1 (de) * 2000-12-07 2002-06-13 Bosch Gmbh Robert Kraftstoffeinspritzsystem für Brennkraftmaschinen
DE10060811A1 (de) * 2000-12-07 2002-06-13 Bosch Gmbh Robert Kraftstoffeinspritzsystem für Brennkraftmaschinen
DE10121891A1 (de) * 2001-05-05 2002-11-07 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE10157135B4 (de) * 2001-11-21 2004-03-11 Man B & W Diesel Ag Kraftstoffversorgungsanlage in Form eines Common-Rail-Systems einer Brennkraftmaschine mit mehreren Zylindern
FR2862352B1 (fr) * 2003-11-14 2006-02-24 Renault Sas Dispositif d'injection de carburant equipe de moyens d'amortissement d'ondes de pression
AT503660B1 (de) * 2006-06-13 2007-12-15 Bosch Gmbh Robert Vorrichtung zum einspritzen von kraftstoff in den brennraum einer brennkraftmaschine
JP2010275908A (ja) * 2009-05-27 2010-12-09 Yanmar Co Ltd インジェクタ
CH702496B1 (de) * 2010-05-07 2011-07-15 Liebherr Machines Bulle Sa Hochdruckinjektor.
AT509877B1 (de) * 2010-11-02 2011-12-15 Bosch Gmbh Robert Vorrichtung zum einspritzen von kraftstoff in den brennraum einer brennkraftmaschine

Also Published As

Publication number Publication date
AT512960B1 (de) 2014-03-15
AT512960A1 (de) 2013-12-15
WO2013174601A1 (fr) 2013-11-28
EP2852754A1 (fr) 2015-04-01

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