EP1400311B1 - Verfahren zur Herstellung eines Einspritzventils mit einer in einer gemeinsamen Ebene liegenden Endfläche - Google Patents

Verfahren zur Herstellung eines Einspritzventils mit einer in einer gemeinsamen Ebene liegenden Endfläche Download PDF

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Publication number
EP1400311B1
EP1400311B1 EP20020018665 EP02018665A EP1400311B1 EP 1400311 B1 EP1400311 B1 EP 1400311B1 EP 20020018665 EP20020018665 EP 20020018665 EP 02018665 A EP02018665 A EP 02018665A EP 1400311 B1 EP1400311 B1 EP 1400311B1
Authority
EP
European Patent Office
Prior art keywords
face
nozzle
needle
sealing
common
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.)
Expired - Fee Related
Application number
EP20020018665
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English (en)
French (fr)
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EP1400311A1 (de
Inventor
Fabrizio Biagetti
Luca Matteucci
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.)
Continental Automotive Italy SpA
Original Assignee
Siemens VDO Automotive SpA
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 Siemens VDO Automotive SpA filed Critical Siemens VDO Automotive SpA
Priority to EP20020018665 priority Critical patent/EP1400311B1/de
Priority to DE2002605027 priority patent/DE60205027T2/de
Publication of EP1400311A1 publication Critical patent/EP1400311A1/de
Application granted granted Critical
Publication of EP1400311B1 publication Critical patent/EP1400311B1/de
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B15/00—Machines or devices designed for grinding seat surfaces; Accessories therefor
    • B24B15/02—Machines or devices designed for grinding seat surfaces; Accessories therefor in valve housings
    • 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
    • F02M61/08—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 the valves opening in direction of fuel flow
    • 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
    • F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for

Definitions

  • the invention relates to a method for producing an injector with a plane common face for an end face of a needle and an end face of one corresponding nozzle of an outwardly opening injector.
  • the injectors are arranged in a cylinder head whereby the tip of the injector is within a combustion chamber of the combustion engine.
  • a directly injecting injector shows the advantage that the fuel air mixture can be formed in the cylinder and the mass of fuel which has to be injected for a good combustion process can be precisely injected into the combustion chamber.
  • the disadvantage of the directly injecting injector is that the injector is subjected to high pressure, high temperature and a chemically aggressive atmosphere. The high temperature could lead to building up combustion residues at an opening of an injector nozzle.
  • DE 10 012 969 A1 describes an injection nozzle and a method for forming a fuel-air mixture.
  • the described injection nozzle comprises a housing end face and a closure member which together form a common, planar surface in the closed state of the injection nozzle. The result of this is that the combustion residues which accumulate in the region of the nozzle outlet, are broken-up by the outwardly opening closing member during a next injection process and are detached by the emergent fuel jet. A growth in combustion residues in the region of the outlet opening or nozzle opening is prevented in this manner.
  • closure member and the housing of the injection nozzle are produced independently. This procedure shows the disadvantage that for forming a planar surface the closure member end face and the housing end face have to be produced with a precise shape in order to correspond to each other.
  • US 6,349,885 describes an injector nozzle with a nozzle body and a poppet.
  • the nozzle body has an internal bore in which the poppet is inserted and that tapers in a constant angle of taper from a front seating region to a fuel reservoir region.
  • a corresponding surface of the poppet diverges slightly from that of the internal bore of the nozzle.
  • the corresponding surfaces of the bore and the poppet form flow control surfaces which terminate in a sharp-edged orifice at the front face of the nozzle.
  • the front face of the nozzle and the poppet in the closed state of the injector are machined to form a common planar surface.
  • WO 91/11609 is the closest prior art and describes a fuel injector with a nozzle and a valve member.
  • the terminal faces of the nozzle and the valve member are substantially co-planar and are of a truncated conical form. This is achieved by grinding the surfaces after assembly.
  • the nozzle has an internal annular surface and the valve member has a corresponding external annular surface. Both annular surfaces are in sealing contact in the closed state of the injector.
  • the annular surfaces meet in a circular seat line that seals the injector in the closed state. This is accomplished by slightly different angles of the annular surfaces in respect to the common axis.
  • the method disclosed in WO 91/11609 for producing a plane common face for an end face of a needle and an end face of a corresponding nozzle of an outwardly opening injector comprises the steps:
  • the common plane end face is grinded as a conical face.
  • there is a sealing face between the needle and the nozzle which shows the shape of a ring which is arranged at a given distance from the common end face. The given distance is of advantage for forming an injecting jet.
  • the rotational position of the needle and the nozzle is fixed during the grinding process and the needle and the nozzle are arranged in that rotational grinding position in the injector for use in a combustion engine.
  • Fixing the needle and the nozzle at a rotational position during the grinding process shows the advantage that there is a precise fitting of the needle and the nozzle providing a plane common face.
  • Using the needle and the nozzle at the rotational grinding position during use in the injector guarantees a precise plane common face.
  • Fig. 1 shows a sectional view of a nozzle 2 of an injector which opens outwardly.
  • the nozzle 2 is part of a direct injector which is arranged in a cylinder head protruding into a combustion chamber of a combustion engine. The combustion chamber is limited by a respective piston.
  • the nozzle 2 shows the shape of a sleeve, whereby the sleeve comprises at an end portion an outer end face 6 and an inner end face 18 at which a first sealing face 3 is arranged.
  • the needle 1 comprises a closing member 4 which is arranged at an end portion of the nozzle 2.
  • the shown injector opens outwardly, which means that the closing member 4 comprises an upper and a lower end face 19, 7.
  • the upper end face 19 comprises a second sealing face 5 which corresponds to the first sealing face 3.
  • the first sealing face 3 defines a valve seat for the closing member 4.
  • Fig. 2 shows a detail of the end portion of the nozzle 2 and the closing member 4 of the needle 1 before the grinding process.
  • the needle 1 and the nozzle 2 were produced in preshaped forms which fit together with regard to the first and the second sealing faces 3, 5.
  • a main feature of the preshaped form is that the outer end face 6 of the nozzle 2 and the lower end face 7 of the closing member 4 are not arranged at a common plane.
  • the lower end face 7 is set a step back in comparison to the outer end face 6.
  • Fig. 3 shows the nozzle 2 and the closing member 4 after the grinding process.
  • a layer of the outer end face 6 and a layer of the lower end face 7 are grinded off.
  • the outer end face 6 is grinded first and after grinding the outer end face 6 to a common plane with the lower end face 7, the lower end face 7 is grinded commonly with the outer end face 6.
  • a common plane face 8 which is partly formed by the nozzle 2 and the closing member 4.
  • the common end face 8 is polished after grinding using an abrasive paper and finally lapped using a diamond paste. This process steps improve the quality of the common end face 8.
  • the sealing face between the closing member 4 and the nozzle 2 shows the shape of a ring which is located at a given distance to the common end face 8.
  • the effective sealing face is located at a given distance from an inner wall of the nozzle 2. Therefore advantageously there is a split between the inner end face 18 of the nozzle 2 and the upper end face 19 of the closing member 4 in direction to the common end face 8 and in direction of a fuel chamber 17 which is arranged within the nozzle 2 and limited by the needle 1.
  • Fig. 4 shows an assembly tool 12 in which the nozzle 2 and the needle 1 is retained. Therefore the nozzle 2 shows a shoulder 15 which shows a greater diameter as a hole of the assembly tool. The nozzle 2 is inserted into the hole lying with the shoulder 15 upon the assembly tool 12. On the top of the nozzle 2 there is a holding sleeve 13 which is protruded by the needle 1. The upper ending of the needle 1 is fixed using a washer 10, an elastic retainer 11 and a spring 9. The spring 9 is arranged between the holding sleeve 13 and the washer 10. The closing member 4 of the needle 1 is pressed by the force of the spring 9 against the first sealing face 3 of the nozzle 2. In this way the nozzle and the needle are fixed within the assembling tool 12.
  • a grinding tool 14 is situated within the hole of the assembly tool 12 grinding the common plane face 8 as shown in Fig. 3. In the shown embodiment the grinding tool 14 comprises a conical grinding face which produces a conical common plane end face 8.
  • the sealing faces between the closing member of the needle and the nozzle are polished using a polishing paste, which is applied between the sealing surfaces, whereby the needle is rotated and pressed against the first sealing surface of the nozzle. This procedure guarantees a precise plane sealing surface between the needle and the nozzle. This step is carried out prior to the grinding process.
  • the needle and the nozzle are fixed in a rotational position during the grinding process and the relative position is marked on the needle and the nozzle.
  • the needle and the nozzle are mounted in the marked position in an injector and held in the marked rotational grinding position. This procedure shows the advantage that the outer end face 6 and the lower end face 7 are in the grinding position. Therefore the common end face 8 is as plane as it has been produced by the grinding process.

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

Claims (9)

  1. Verfahren zur Herstellung einer gemeinsamen ebenen Fläche (8) für eine Endfläche (7) einer Nadel (1) und eine Endfläche (6) einer entsprechenden Düse (2) einer sich nach außen öffnenden Einspritzvorrichtung mit den folgenden Schritten:
    die Düse (2) und die Nadel (1) werden mit Formen hergestellt, die zumindest grob aneinander angepaßt sind;
    die Nadel (1) besitzt ein Schließelement (4) mit einer oberen Endfläche (19) mit einer zweiten Dichtungsfläche (5) und einer unteren Endfläche (7);
    die Düse (2) besitzt ein Öffnungsende mit einer inneren Endfläche (18) mit einer ersten Dichtungsfläche (3) und einer äußeren Endfläche (6);
    die Nadel (1) wird vom Öffnungsende und der Dichtungsfläche (5) der Nadel (1) in die Düse (2) eingesetzt, und die Dichtungsfläche (3) der Düse (2) wird unter Verwendung einer Polierpaste, die zwischen die Dichtungsflächen (5,3) aufgebracht wird, poliert und die Nadel (1) wird gedreht und mit der zweiten Dichtungsfläche (5) gegen die erste Dichtungsfläche (3) der Düse (2) gepreßt; und
    danach werden die untere Endfläche (7) der Nadel (1) und die äußere Endfläche (6) der Düse (2) zu einer gemeinsamen ebenen Endfläche (8) geschliffen, die sich zumindest an der Grenze der unteren Endfläche (7) und der äußeren Endfläche (6) befindet.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Öffnungsende der Düse (2) einen größeren Durchmesser besitzt als der Durchmesser des Schließelementes der Nadel und daß am Beginn des Schleifprozesses eine Stufe zwischen der äußeren Endfläche (6) der Düse (2) und der unteren Endfläche (7) der Nadel vorhanden ist, wobei die äußere Endfläche (6) weiter außen als die untere Endfläche (7) angeordnet ist.
  3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Schleifen der unteren Endfläche (7) der Nadel (1) und der äußeren Endfläche der Düse (2) bei einer maximalen Schleiftiefe der unteren Endfläche (7) der Nadel (1) gestoppt wird.
  4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß die maximale Tiefe 0,05 mm, insbesondere 0,03 mm, beträgt.
  5. Verfahren nach einem der Ansprüche 1 - 4, dadurch gekennzeichnet, daß die gemeinsame ebene Endfläche (8) als konische Fläche geschliffen wird.
  6. Verfahren nach einem der Ansprüche 1 - 5, dadurch gekennzeichnet, daß die Dichtungsflächen (5,3) der Nadel (1) und der Düse (2) so hergestellt werden, daß die Dichtungsflächen Ringflächen sind, die in einem vorgegebenen Abstand von der gemeinsamen Endfläche (8) angeordnet sind, und daß es einen Sprung zwischen der inneren Endfläche (18) der Düse (2) und der oberen Endfläche (19) der Nadel gibt, der an der gemeinsamen Endfläche bis zu den Dichtungsflächen (5,3) beginnt.
  7. Verfahren nach einem der Ansprüche 1 - 6, dadurch gekennzeichnet, daß die Dichtungsflächen (5,3) der Nadel (1) und der Düse (2) so hergestellt werden, daß sie die Form von Ringflächen besitzen, und daß ein Sprung zwischen der Nadel und der Düse vorhanden ist, der bei einer Kraftstoffkammer beginnt und von der Nadel (1) und der Düse (2), die an den Dichtungsflächen (5,3) der Nadel (1) und der Düse (2) enden, festgelegt wird.
  8. Verfahren nach einem der Ansprüche 1 - 7, dadurch gekennzeichnet, daß während des Schleifprozesses eine Drehlage zwischen der Nadel und der Düse fixiert wird und daß die Nadel und die Düse in der Drehschleiflage in der Einspritzvorrichtung angeordnet werden.
  9. Verfahren nach einem der Ansprüche 1 - 8, dadurch gekennzeichnet, daß die gemeinsame Endfläche unter Verwendung eines Schleifpapiers poliert und schließlich unter Verwendung einer Diamantpaste gelappt wird.
EP20020018665 2002-08-20 2002-08-20 Verfahren zur Herstellung eines Einspritzventils mit einer in einer gemeinsamen Ebene liegenden Endfläche Expired - Fee Related EP1400311B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP20020018665 EP1400311B1 (de) 2002-08-20 2002-08-20 Verfahren zur Herstellung eines Einspritzventils mit einer in einer gemeinsamen Ebene liegenden Endfläche
DE2002605027 DE60205027T2 (de) 2002-08-20 2002-08-20 Verfahren zur Herstellung eines Einspritzventils mit einer in einer gemeinsamen Ebene liegenden Endfläche

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20020018665 EP1400311B1 (de) 2002-08-20 2002-08-20 Verfahren zur Herstellung eines Einspritzventils mit einer in einer gemeinsamen Ebene liegenden Endfläche

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EP1400311A1 EP1400311A1 (de) 2004-03-24
EP1400311B1 true EP1400311B1 (de) 2005-07-13

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EP20020018665 Expired - Fee Related EP1400311B1 (de) 2002-08-20 2002-08-20 Verfahren zur Herstellung eines Einspritzventils mit einer in einer gemeinsamen Ebene liegenden Endfläche

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DE (1) DE60205027T2 (de)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2246557B1 (de) * 2009-04-20 2012-06-20 Continental Automotive GmbH Injektor zum Einspritzen von Fluid

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB842543A (en) * 1959-03-18 1960-07-27 Caterpillar Tractor Co Valve lapping machine
EP0393328B1 (de) * 1986-05-31 1993-11-10 Robert Bosch Gmbh Kraftstoffeinspritzventil
DE3925043A1 (de) * 1988-08-26 1990-03-08 Bosch Gmbh Robert Verfahren und vorrichtung zur herstellung von dichtflaechen an ventilen
IN180853B (de) * 1990-01-26 1998-03-28 Orbital Eng Pty
DE19545333A1 (de) * 1995-12-05 1997-06-12 Bosch Gmbh Robert Ventilschließkörper und Verfahren und Vorrichtung zur Herstellung von Dichtsitzen an Ventilschließkörpern
US6109549A (en) * 1999-03-12 2000-08-29 Outboard Marine Corporation Fuel injector for internal combustion engines and method for making same

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DE60205027D1 (de) 2005-08-18
EP1400311A1 (de) 2004-03-24
DE60205027T2 (de) 2006-01-05

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