EP3014104B1 - Ensemble buse pour un injecteur de carburant et injecteur de carburant - Google Patents

Ensemble buse pour un injecteur de carburant et injecteur de carburant Download PDF

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Publication number
EP3014104B1
EP3014104B1 EP14720622.1A EP14720622A EP3014104B1 EP 3014104 B1 EP3014104 B1 EP 3014104B1 EP 14720622 A EP14720622 A EP 14720622A EP 3014104 B1 EP3014104 B1 EP 3014104B1
Authority
EP
European Patent Office
Prior art keywords
nozzle
valve seat
nozzle needle
pressure bore
blind
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
EP14720622.1A
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German (de)
English (en)
Other versions
EP3014104A1 (fr
Inventor
Christian Wehr
Gerhard Suenderhauf
Andreas Koeninger
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
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP3014104A1 publication Critical patent/EP3014104A1/fr
Application granted granted Critical
Publication of EP3014104B1 publication Critical patent/EP3014104B1/fr
Active 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies
    • 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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
    • F02M61/1813—Discharge orifices having different orientations with respect to valve member direction of movement, e.g. orientations being such that fuel jets emerging from discharge orifices collide with each other
    • 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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
    • F02M61/182—Discharge orifices being situated in different transversal planes with respect to valve member direction of movement
    • 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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1886—Details of valve seats not covered by groups F02M61/1866 - F02M61/188
    • 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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1893—Details of valve member ends not covered by groups F02M61/1866 - F02M61/188
    • 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
    • F02M2200/02—Fuel-injection apparatus having means for reducing wear
    • 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
    • F02M2200/06—Fuel-injection apparatus having means for preventing coking, e.g. of fuel injector discharge orifices or valve needles
    • 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

Definitions

  • the invention relates to a nozzle assembly for a fuel injector for injecting fuel into the combustion chamber of an internal combustion engine with the features of the preamble of claim 1. Furthermore, the invention relates to a fuel injector with such a nozzle assembly.
  • a nozzle assembly for a fuel injector comprising a nozzle body having a bore which opens via a conical nozzle needle seat for a conical sealing surface of a received in the bore nozzle needle in a blind hole.
  • a conical nozzle needle seat for a conical sealing surface of a received in the bore nozzle needle in a blind hole.
  • the nozzle needle has a nozzle needle tip with a pin which dips into the blind hole and in this way reduces the dead volume remaining in the blind hole in the closed position of the nozzle needle.
  • the peg-like nozzle needle tip can be lifted completely out of the blind hole, so that there is a risk of the nozzle needle striking the nozzle body during re-immersion.
  • the result is increased wear in the transition region from the nozzle needle seat into the blind hole, in particular in the area of an intersecting edge. The wear in turn leads to a changed switching behavior of the nozzle needle.
  • a nozzle needle fuel injectors for diesel engines is known with an injector, wherein the nozzle needle cooperates with a formed in the Injektorgeophuse conical seat for opening and closing at least one injection port.
  • the nozzle needle has a cylindrical end portion, which is arranged in a cylindrical portion of the injector and this has a distance of two to three hundredths of a millimeter.
  • the invention is therefore based on the object to provide a nozzle assembly for a fuel injector, comprising a nozzle needle with a submersible in a blind hole pin, which is less subject to wear.
  • the proposed nozzle assembly comprises a nozzle body and a nozzle needle, which is accommodated for releasing and closing at least one injection port in a high-pressure bore of the nozzle body, wherein a in a blind hole-like end portion overflowing conical portion of the high-pressure bore for forming a valve seat with a conical sealing surface of the nozzle needle, to which is a plunged into the blind hole-like end portion pin is attached, sealingly cooperates.
  • a valve seat near guide region upstream of the valve seat between the nozzle needle and the nozzle body is formed for permanent guidance of the nozzle needle in the high pressure bore, whose radial guide clearance smaller than a radial gap between a cylindrical part of the blind hole-like end portion of the high-pressure bore and a cylindrical part of the pin of the nozzle needle.
  • the permanent guidance of the nozzle needle via the at least one valve seat near the guide region upstream of the valve seat prevents a radial deflection of the nozzle needle and thus the risk of striking the nozzle needle on the nozzle body. In this way, the wear in the transition region from the valve seat in the blind hole-like end portion is significantly reduced.
  • the pin of the nozzle needle is designed so that he a cylindrical part of the blind hole-like end portion cooperating throttle forming.
  • the throttle formation is dependent on the stroke of the nozzle needle, so that over this the inflow to at least one injection port is controllable.
  • the radial gap is greater than the radial guide clearance of the valve seat near the guide region upstream of the valve seat selected. Because the radial gap is not suitable for permanent guidance of the nozzle needle in the high-pressure bore, since its formation is dependent on the stroke of the nozzle needle. A guiding function could take over the radial gap therefore only temporarily.
  • a radial gap of less than 20 microns, preferably less than 10 microns is proposed.
  • the leadership function of the valve seat near guide area is maintained, its radial guide clearance is to be chosen correspondingly smaller.
  • the at least two injection openings are arranged at an axial distance from one another. This allows the formation of at least two axially spaced spray hole rows. The arrangement of the axially spaced injection openings is preferably carried out in such a way that the inflow of fuel through the throttle-forming radial gap in dependence on the stroke of the nozzle needle is controllable.
  • the at least two axially spaced injection openings can for example be arranged such that at least one injection opening in the region of the blind-hole-like end portion and at least one further injection opening in the region of the conical portion downstream of the valve seat open into the high-pressure bore.
  • the at least one injection opening opening into the blind-hole-like end section is then controllable via the throttle-forming radial gap.
  • a guide region near the valve seat does not preclude that an additional guide region for permanent guidance of the nozzle needle is formed at an axial distance therefrom, ie in a region of the high-pressure bore remote from the valve seat, as is conventionally the case with known nozzle assemblies for fuel injectors.
  • the permanent guidance of the nozzle needle via the at least one valve seat near guide region not only has a wear-reducing effect, but also prevents an asymmetrical spray pattern caused by a disalignment of the nozzle needle. This has an advantageous effect on the pollutant emissions of the internal combustion engine when using the nozzle assembly in a fuel injector for injecting fuel into a combustion chamber of an internal combustion engine.
  • the nozzle body or the nozzle needle to form the valve seat near the guide region upstream of the valve seat at least two axially extending guide ribs, between which flow channels are formed.
  • the flow channels ensure the inflow of fuel to the at least one injection port during operation of the fuel injector.
  • the guide ribs are formed on the nozzle body, they preferably cooperate with a cylindrical shaft portion of the nozzle needle gap-forming.
  • the guide ribs are preferably on a radial wall defining the high-pressure bore cylindrical wall surface of the nozzle body arranged and protrude into the high pressure bore.
  • the guide ribs may be formed on the nozzle needle and cooperate with a high pressure bore radially bounding cylindrical wall surface of the nozzle body gap-forming.
  • the guide ribs can be arranged in this case on a cylindrical shaft portion of the nozzle needle, so that they protrude into the high-pressure bore.
  • the axially extending guide ribs for forming the valve seat near guide region upstream of the valve seat are arranged at the same angular distance from each other.
  • at least three guide ribs are provided at an angular distance of 120 °.
  • the angular distance is 90 °, with five guide ribs 72 ° and with six guide ribs 60 °.
  • more than six guide ribs can be provided, wherein it must be ensured that sufficiently large flow channels remain between the guide ribs.
  • the same angular distance of the guide ribs to each other ensures optimal guidance of the nozzle needle in the high-pressure bore.
  • a plurality of injection openings are provided for forming at least one spray hole row.
  • the plurality of injection openings of a spray hole row are preferably arranged at equal angular distance from each other to produce a symmetrical spray pattern.
  • a fuel injector is proposed with a nozzle assembly according to the invention further.
  • the less wear-prone nozzle assembly increases the life of the fuel injector:
  • the pollutant emissions can also be reduced because the permanent guide prevents radial deflection of the nozzle needle and thus an asymmetric spray pattern.
  • the fuel injector may in particular be a fuel injector for a common-rail injection system.
  • FIG. 1 shows a longitudinal section through a nozzle assembly according to the invention in the region of a valve seat.
  • the nozzle assembly shown comprises a nozzle body 1 with a high-pressure bore 4, in which a nozzle needle 2 is received in a liftable manner.
  • the high-pressure bore 4 has, to form a valve seat 7, a conical section 6, which merges into a blind-hole-like end section 5, into which at least one injection opening 3 opens.
  • a further injection opening 3 opens into the conical section 5 into the high-pressure bore 4.
  • the nozzle needle 2 has a conical sealing surface 8 sealingly cooperating with the valve seat 7 a pin 9 is attached.
  • the pin 9 has a directly adjacent to the conical sealing surface 8 cylindrical part which cooperates with a cylindrical portion of the blind hole-like end portion 5 - in response to the stroke of the nozzle needle 2 - forming a radial gap 11.
  • the radial gap 11 has a throttle function to control the inflow of fuel to the injection port 3, which opens into the blind-hole-like end portion 5 of the high-pressure bore 4. This has the consequence that in a first phase of the opening stroke of the nozzle needle 2, the injection takes place primarily via the injection port 3, which opens into the conical portion 6 of the high-pressure bore 4.
  • the nozzle assembly shown has a valve seat near guide portion 10 upstream of the valve seat 7.
  • the guide region 10 is formed by a plurality of axially extending guide ribs 12 of the nozzle body 1, which cooperate with a cylindrical shaft portion of the nozzle needle 2 forming a gap.
  • the guide ribs 12 protrude from a cylindrical wall surface of the nozzle body 1 to the radial boundary of the high-pressure bore 4 into the high-pressure bore 4.
  • the guide ribs 12 are provided at an angular distance of 90 °, wherein between the guide ribs 12 axially extending flow channels are formed, which ensure the inflow of fuel to the injection openings 3.
  • the guide region 10 ensures a permanent guidance of the nozzle needle 2 in the high-pressure bore 4 independently of the stroke of the nozzle needle 2. This ensures that the nozzle needle 2 undergoes no radial deflection, which could lead to the striking of the pin 9 on the nozzle body 1.
  • the Radial gap 11 greater than the radial guide clearance of the valve seat near the guide region 10 is selected.
  • Another advantage of the permanent guidance of the nozzle needle 2 via the valve seat near guide region 10 is the fact that an asymmetric spray pattern associated with a desalination of the nozzle needle 2 is prevented. This has a favorable effect on the pollutant emissions when using the nozzle assembly in a fuel injector for injecting fuel into the combustion chamber of an internal combustion engine. This means that pollutant emissions are reduced.
  • the invention is not limited to the illustrated preferred embodiment. Modifications are possible, which relate in particular to the number, arrangement and specific design of the guide ribs 12 for forming the guide region 10.
  • the guide ribs 12 may also be formed on the nozzle needle 2.
  • the number, the arrangement and the specific configuration of preferably a plurality of injection openings 3 are freely selectable.

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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)

Claims (6)

  1. Ensemble de buse pour un injecteur de carburant, comprenant un corps de buse (1) et un pointeau (2), qui est logé avec un mouvement de levée dans un alésage haute pression (4) du corps de buse (1) afin de libérer et de fermer au moins un orifice d'injection (3), dans lequel une partie conique (6) de l'alésage haute pression (4) se prolongeant par une partie finale (5) en forme de trou borgne pour former un siège de soupape (7) coopère de façon étanche avec une surface d'étanchéité conique (8) du pointeau (2), sur laquelle est placé un bout (9) pouvant pénétrer dans la partie d'extrémité en forme de trou borgne (5), dans lequel une zone de guidage (10) proche du siège de soupape est formée en amont du siège de soupape (7) entre le pointeau (2) et le corps de soupape (1) pour le guidage permanent du pointeau (2) dans l'alésage haute pression (4), zone dont le jeu de guidage radial est plus petit qu'un écartement radial (11) entre une partie cylindrique de la partie d'extrémité en forme de trou borgne (5) de l'alésage haute pression (4) et une partie cylindrique du bout (9) du pointeau (2), dans lequel le bout (9) du pointeau (2) coopère avec la partie cylindrique de la partie d'extrémité en forme de trou borgne (5) en formant un étranglement et la formation de l'étranglement dépend en l'occurrence de la levée du pointeau (2), caractérisé en ce que l'écartement radial (11) est inférieur à 20 µm, de préférence inférieur à 10 µm et en ce qu'il est prévu au moins deux orifices d'injection (3) qui sont disposés à une distance axiale l'un de l'autre, dans lequel au moins un orifice d'injection (3) débouche dans la région de la partie d'extrémité en forme de trou borgne (5) et au moins un autre orifice d'injection (3) débouche dans la région de la partie conique (6) en aval du siège de soupape (7) dans l'alésage haute pression (4).
  2. Ensemble de buse selon la revendication 1, caractérisé en ce que le corps de buse (1) ou le pointeau (2) comporte au moins deux nervures de guidage s'étendant axialement (12) pour la formation de la zone de guidage proche du siège de soupape (10) en amont du siège de soupape (7), entre lesquelles des canaux d'écoulement sont formés.
  3. Ensemble de buse selon la revendication 2, caractérisé en ce que les nervures de guidage s'étendant axialement (12) pour la formation de la zone de guidage proche du siège de soupape (10) en amont du siège de soupape (7) sont disposées à des distances angulaires égales l'une de l'autre.
  4. Ensemble de buse selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il est prévu plusieurs orifices d'injection (3) pour la formation d'au moins une rangée de trous d'injection, dans lequel les multiples orifices d'injection (10) d'une rangée de trous d'injection sont de préférence disposés à des distances angulaires égales l'un de l'autre.
  5. Ensemble de buse selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il est prévu au moins deux orifices d'injection (3), dont les axes longitudinaux sont inclinés différemment par rapport à un axe longitudinal (A) de l'alésage haute pression (4).
  6. Injecteur de carburant avec un ensemble de buse selon l'une quelconque des revendications précédentes.
EP14720622.1A 2013-06-25 2014-04-30 Ensemble buse pour un injecteur de carburant et injecteur de carburant Active EP3014104B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013212142.3A DE102013212142A1 (de) 2013-06-25 2013-06-25 Düsenbaugruppe für einen Kraftstoffinjektor sowie Kraftstoffinjektor
PCT/EP2014/058928 WO2014206610A1 (fr) 2013-06-25 2014-04-30 Ensemble buse pour un injecteur de carburant et injecteur de carburant

Publications (2)

Publication Number Publication Date
EP3014104A1 EP3014104A1 (fr) 2016-05-04
EP3014104B1 true EP3014104B1 (fr) 2017-06-14

Family

ID=50628834

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14720622.1A Active EP3014104B1 (fr) 2013-06-25 2014-04-30 Ensemble buse pour un injecteur de carburant et injecteur de carburant

Country Status (3)

Country Link
EP (1) EP3014104B1 (fr)
DE (1) DE102013212142A1 (fr)
WO (1) WO2014206610A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018206101A1 (de) * 2018-04-20 2019-10-24 Robert Bosch Gmbh Düsenbaugruppe für einen Kraftstoffinjektor, Kraftstoffinjektor
DE102019210631A1 (de) * 2019-07-18 2021-01-21 Robert Bosch Gmbh Kraftstoffinjektor für Brennkraftmaschinen

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2050592A5 (fr) * 1969-06-18 1971-04-02 Ffsa
IT1167325B (it) * 1983-04-11 1987-05-13 Roberto Bosio Polverizzatore per iniettori del combustibile di motori diesel
EP0283154A1 (fr) * 1987-03-14 1988-09-21 LUCAS INDUSTRIES public limited company Injecteur de combustible
DE19642513A1 (de) * 1996-10-15 1998-04-16 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE10207189A1 (de) * 2001-03-03 2002-09-12 Fev Motorentech Gmbh Schaltbare Einspritzeinrichtung zur Einspritzung unterschiedlicher Kraftstoffmengen
DE10348928A1 (de) * 2003-10-18 2005-05-12 Bosch Gmbh Robert Kraftstoffeinspritzvorrichtung
DE202006007883U1 (de) * 2006-05-17 2006-10-19 Robert Bosch Gmbh Kraftstoffinjektor mit doppelter Nadelführung
DE102008039920A1 (de) 2008-08-27 2010-03-04 Continental Automotive Gmbh Düsenkörper, Düsenbaugruppe und Kraftstoffinjektor, sowie Verfahren zum Herstellen eines Düsenkörpers
DE102011076665A1 (de) * 2011-05-30 2012-12-06 Robert Bosch Gmbh Düsenbaugruppe für einen Kraftstoffinjektor sowie Kraftstoffinjektor

Also Published As

Publication number Publication date
WO2014206610A1 (fr) 2014-12-31
EP3014104A1 (fr) 2016-05-04
DE102013212142A1 (de) 2015-01-08

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