EP1848891B1 - Dichtungseinrichtung für einen kraftstoffinjektor sowie verfahren zum abdichten - Google Patents

Dichtungseinrichtung für einen kraftstoffinjektor sowie verfahren zum abdichten Download PDF

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Publication number
EP1848891B1
EP1848891B1 EP06706983A EP06706983A EP1848891B1 EP 1848891 B1 EP1848891 B1 EP 1848891B1 EP 06706983 A EP06706983 A EP 06706983A EP 06706983 A EP06706983 A EP 06706983A EP 1848891 B1 EP1848891 B1 EP 1848891B1
Authority
EP
European Patent Office
Prior art keywords
sealing
concave
tension nut
nozzle
region
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
EP06706983A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1848891A1 (de
Inventor
Maximilian Kronberger
Hartmut Stehr
Roman Brauneis
Dejan Jovovic
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 GmbH
Volkswagen AG
Original Assignee
Continental Automotive GmbH
Volkswagen AG
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 Continental Automotive GmbH, Volkswagen AG filed Critical Continental Automotive GmbH
Publication of EP1848891A1 publication Critical patent/EP1848891A1/de
Application granted granted Critical
Publication of EP1848891B1 publication Critical patent/EP1848891B1/de
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
    • 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
    • F02M61/166—Selection of particular materials
    • 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
    • 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 sealing arrangement for a fuel injector, in particular the invention relates to a sealing arrangement for a nozzle retaining nut of a fuel injector, to ensure a fluid-tight connection between the fuel injector and a cylinder head. Furthermore, the invention relates to a nozzle retaining nut for a fuel injector.
  • a nozzle retaining nut holds the two main components of a fuel injector - an injector and a valve body - firmly together.
  • the injection nozzle protrudes in the assembled state of the fuel injector in a cylinder head into a combustion chamber of an automobile engine, wherein the valve body arranged above actuates the injection nozzle.
  • seal assembly At such a seal assembly high demands are made. On the one hand, it is exposed to high thermal loads, -40 ° C at cold start in winter to over + 150 ° C under operating conditions, and secondly high mechanical loads, in particular vibration loads. In addition, the seal assembly must ensure a durable sealing state between fuel injector and cylinder head with long-lasting loads.
  • both sealing surfaces must be machined very accurately in order to get the connection ever fluid-tight. Due to the lateral play to be provided between the fuel injector and the injector bore, no centering between the fuel injector and the injector bore is possible with this design, so that this must be done by means of other inputs or devices.
  • the angular difference of 2 ° to 5 ° is too small to prevent jamming and to ensure self-centering.
  • increasing the angular difference between the truncated cone on the nozzle retaining nut and the conical bore in the cylinder head to more than 5 ° smears would be made to the later seal quality, which can lead to leaks in the operation of the fuel injector.
  • the DE 101 02 192 A1 discloses fastener means for a fuel injector on a cylinder head, wherein the fuel injector within the cylinder head is surrounded by a sleeve which sealingly cooperates in cooperation with a sealing element of soft metal lying on a bottom of a stepped bore in the cylinder head.
  • the fuel injector should have a good self-centering when mounted in the cylinder head and produce a permanently fluid-tight connection between the fuel injector and the cylinder head in cooperation with the cylinder head. This should preferably be done by means of the nozzle retaining nut of the fuel injector.
  • the object of the invention is achieved by means of a sealing device or a sealing arrangement for a cylinder head and a fuel injector, in particular for a nozzle retaining nut of the fuel injector and the cylinder head, wherein the one component has a radially preferably completely encircling, extending in a longitudinal direction, concave cross-sectional profile, which on / in a sealing surface or sealing edge of a second component fluid-sealing attachable / einpressbar is.
  • the nozzle retaining nut of the fuel injector is configured with a radial and completely circumferential concave chamfer.
  • a sealing seat edge is horizontally extending within a stepped Injektorbohrung or tapered at an angle.
  • the concave chamfer and the sealing edge of the sealing seat edge interact in a special way.
  • a Vormontage- or centering state of the fuel injector is used with its nozzle lock nut in the Injektorbohrung without artificial forces acting on the fuel injector.
  • the dimensions of the nozzle retaining nut and the injector bore are selected such that the concave region or the concave chamfer of the nozzle retaining nut is seated against the sealing edge of the sealing seat edge of the injector bore.
  • the concave chamfer of the nozzle retaining nut sits only with a circle or a thin circular ring (centering state) on the edge of the sealing seat edge, as a result of which the nozzle clamping nut can not jam in the injector bore. Due to a low friction between the nozzle retaining nut and the cylinder head, the fuel injector is self-centering in the injector bore.
  • the concave chamfer preferably has the lowest possible coefficient of adhesion and / or sliding friction, as a result of which self-centering is still favored.
  • the sealing state between the fuel injector and the cylinder head can be assumed.
  • the fuel injector is pressed with a large static force in the Injektorbohrung or the sealing seat, which is formed in the bore, whereby the preferably harder relative to the cylinder head concave area the sealing seat edge preferably plastically deformed and pressed into the sealing seat edge is that a fluid-tight connection between the nozzle lock nut and the cylinder head is made.
  • a planar sealing section is formed between nozzle retaining nut and cylinder head, wherein due to the plastic deformation of the sealing seat rim, this adapts to the concave bevel and produces a high fluid pressure between the fuel injector and the cylinder head at high surface pressure. Furthermore, it is thereby possible to compensate for unevenness or small recesses in the surfaces. Such arrangements are permanently resistant to pressure undercurrents, so that a thermally and mechanically highly resilient seal assembly is realized with simultaneous long-term tightness.
  • the angle in the centering between a tangent to a contact point between the seat edge and Konkavfase, with the radially outwardly extending sealing seat edge is about 10 °, resulting in a good self-centering of the fuel injector in the cylinder head.
  • a tangent angle of a radially outer contact point between Konkavfase and sealing seat edge changes to the usual in the prior art 2 ° to 5 °.
  • the cylinder head or the sealing seat edge here are usually made of aluminum or magnesium.
  • the concave chamfer results in particular in the further inner radial region of the sealing seat edge an increased specific surface pressure, whereby the seal between the fuel injector and the cylinder head is improved over the prior art.
  • the highest surface pressure occurs at the inner region of the sealing seat edge, on which also the internal pressure of the combustion chamber rests; which is particularly advantageous, since a pressure infiltration can be effectively countered.
  • the voltage curve in the cylinder head is cheaper, resulting in fewer cracks in the cylinder head, which increases the durability of the cylinder head.
  • the introduction of force into the nozzle retaining nut is optimized over the prior art, which likewise results in a more favorable stress curve within the nozzle retaining nut.
  • a connecting line which in the centering state passes through the contact point of the concave chamfer with the sealing seat edge and through a peripheral point on the outer diameter of the concave region (in this case, the two points of the straight line and a longitudinal axis of the nozzle lock nut lie in one plane) a corresponding diametrically opposite straight line an angle of preferably about 108 ° or about 110 °.
  • the radius of the preferably part-circular concave bevel is 55 mm ⁇ 20 mm, in particular 55 mm ⁇ 5 mm.
  • the invention relates to an engine and / or a cylinder head with a fuel injector according to the invention or a fuel injector with a nozzle retaining nut according to the invention.
  • the first component has a radial and preferably completely circumferential concave portion, which for a pre-assembly state to a sealing seat edge of the second component for centering the two components to each other is set.
  • the concave region moves under an elastic, but preferably plastic, deformation of the material of the sealing seat edge into the second component in such a way that between the concave region and the sealing seat edge common sealing surface arises due to a surface pressure, which is fluid-tight even at high internal pressures.
  • nozzle retaining nut 10 is cut to the right and is not shown cut on the left, the nozzle retaining nut 10 bracing an injection nozzle 20 arranged at the bottom with a valve body 30 arranged at the top.
  • Fig. 1a and 1b show a seal assembly according to the invention, in particular for permanent and high-pressure fluid tightness of two components 10 and 40, z. B. a nozzle retaining nut 10 and a cylinder head 40th
  • the Fig. 1a represents a preassembled state of the two components 10, 40, wherein the component 10 relative to the component 40 preferably centered itself, therefore, this pre-assembly is also called centering.
  • this pre-assembly is also called centering.
  • a self-centering of the two components 10, 40 to one another is not absolutely necessary for the invention; It is sufficient if the first component 10 can be attached to the second component 40, without a mutual self-centering. However, if a mutual centering is necessary, but self-centering is not possible, this should be done by external means.
  • the first component 10 has a concave region 122
  • the second component 40 has a sealing seat edge 422.
  • the concave portion 122 is seated with a central portion at the edge 424 of the sealing seat edge 422.
  • the center portion of the concave portion 122 is to be seen only as a point or a small area (contact point between the concave portion 122 and sealing seat edge 422), for the preferred rotationally symmetric component 10, this is idealized a circle or a thin circular ring.
  • a seating of the smallest diameter of the concave portion 122 (lower edge on the component 10) on the sealing seat edge 422 is also possible (further embodiment).
  • a portion of the concave portion 122 In a sealing state of the two components 10, 40, the in Fig. 1b is shown, a portion of the concave portion 122, by at least elastic, preferably plastic deformation of the material of the second member 40 in the sealing seat edge 422 impressed or pressed.
  • the impressions of the first component 10 in the second component 40 takes place in a portion of the edge 424 of the sealing seat edge 422 radially outward from a longitudinal axis L of the seal assembly path.
  • the deformation of the second member 40 is indicated by a broken line in FIG Fig. 1b indicated.
  • the Fig. 2 to 4 show a first preferred embodiment of the seal assembly according to the invention, wherein the seal assembly according to the invention is adapted to a nozzle retaining nut 10 and a cylinder head 40 associated therewith.
  • the sealing arrangement according to the invention serves to seal a fuel injector 1 preferably via its nozzle retaining nut 10 in an injector bore 42 of the cylinder head 40 with respect to a combustion chamber of an internal combustion engine.
  • a sealing device according to the invention is preferably located at the lower free end of the nozzle lock nut 10, which clamps together an injection nozzle 20 with a valve body 30 and combines them to form a fuel injector 1 (see FIG. Fig. 2 );
  • the sealing device according to the invention can also be provided on the fuel injector 1 itself, the nozzle retaining nut 10 then assumes no or only other sealing tasks for the fuel injector 1.
  • This first embodiment of the sealing device on the nozzle retaining nut 10 comes with a sealing seat in the injector bore 42 (FIG. Fig. 3a and 3b ) to the plant, said sealing means and sealing seat together according to the principle of the invention according to the Fig. 1a and 1b interact.
  • a sealing or centering region 12 of the nozzle retaining nut 10 is preferably constructed in two parts.
  • a frusto-conical region 126 follows from below when approaching a concave region 122.
  • Concave portion 122 and truncated cone portion 126 serve the nozzle retaining nut 10 and the fuel injector 1 in the injector bore 42 (FIGS. Fig. 3a and 3b ), wherein the concave portion 122 designed to is to center the nozzle retaining nut 10 at a sealing seat edge 422 of the injector bore 42 in the centering or pre-assembly state.
  • the nozzle retaining nut 10 is constructed radially symmetrical, wherein the concave portion 122 has a radially extending and fully encircling Konkavfase 124 which extends with its cross-sectional profile in the longitudinal or axial direction L of the nozzle lock nut 10 upwards.
  • the nozzle lock nut 10 may also be constructed so that the truncated cone portion 126 is absent and at the lower, substantially conical portion of the nozzle lock nut 10, only the concave portion 122 is present.
  • a cylinder region 14 of the nozzle retaining nut 10 adjoins above, in which mainly the valve body 30 is received.
  • the concave chamfer 124 or the concave portion 122 is seated on an edge 424 of a sealing seat edge 422.
  • the edge 424 of the sealing seat rim 422 essentially describes a circle or a thin circular ring on the concave chamfer 124. The more circular (in one plane) this section on the concave chamfer 124, the more centered the nozzle chuck nut 10 sits in the injector bore 42 of the cylinder head 40 ,
  • the injector bore 42 is preferably a stepped circular cylinder bore, whose lower portion of smaller diameter receives a portion of the injection nozzle 20 and the upper diameter larger portion of the nozzle retaining nut 10 of the fuel injector 1. Both regions are preferably connected via a cone or a circular ring bevel (referred to below as truncated cone region 426); however, it is also possible to have a horizontal step which forms a right angle with the respective section of the injector bore 42.
  • the contact point M (sectional view of the Fig. 3a ) or the Bermm Vietnamese (ring) M (Realsituation with fuel injector 1) centered in injector bore 42, from edge 424 and concave chamfer 124 between a circumferential point (circumferential) circle (ring) I to the (lower) inner diameter D I ( Fig. 4 ) of the concave chamfer 124 and a circumferential point / circle (ring).
  • the sealing seat edge 422 of the injector bore 42 is preferably an inner portion of the truncated cone portion 426 of the injector bore 42, wherein the truncated cone portion 426 with the truncated cone portion 126 of the nozzle lock nut 10 has a circumferential opening angle of about 0.5 ° to 5 ° (ideal centering - that of all Points M formed circle is perpendicular to L). Other angle relationships as in Fig. 3a are shown in the explanation of Fig. 4 given.
  • the Fig. 3b shows a sealing state of nozzle retaining nut 10 and cylinder head 40, wherein the nozzle lock nut 10 is pressed into the sealing seat edge 422 of the injector bore 42 with a preferably plastic deformation of the sealing seat edge 422.
  • deformation of the inner sealing seat edge 422 preferably takes place inwardly (see description of FIG Fig. 1b ).
  • a circular surface pressure with a high, uniform circular ring thickness and the highest possible surface pressure out, which has no points of discontinuity in the pressing.
  • the outer diameter edge (A) of the concave chamfer 124 does not dive straight into the truncated cone region 426 or the sealing seat edge 422.
  • Fig. 4 shows the sealing portion 12 of the nozzle lock nut 10 which is divided into truncated cone portion 126 and concave portion 122 in detail.
  • the truncated cone portion 126 and the concave portion 122 have a common circle in the Fig. 4 among other things in point A can be seen. This is at the same time a circumferential circle point A of the largest outer diameter D A of the concave region 122.
  • the concave chamfer 124 is preferably formed part-circular, wherein the radius R can vary between 20mm and 100mm. In a preferred embodiment of the invention, the radius of the concave chamfer 124 is 55 55 ⁇ 5 mm. Correspondingly different radii arise when applying the inventive idea to other components; In principle, it is important that it is a concave contour. Not part-circular contours, which differ from a simple truncated cone, are also possible according to the invention.
  • the following angle specifications for the sealing device according to the invention relate to an inner opening angle of a cone which is formed by a line rotating about the longitudinal axis L of the nozzle retaining nut 10.
  • a straight line T M is the tangent to the point M in the centering state of the nozzle retaining nut 10
  • the opening angle ⁇ M of the cone in the centering state preferably being between 104 ° and 110 °, depending on the radius R of the concave chamfer 124.
  • a corresponding angle ⁇ A of the tangent T A at the point A is preferably between 107 ° and 113 °, again depending on the radius R of the concave chamfer 124.
  • An angle ⁇ of a connecting line MA of the points M and A is preferably 106 ° to 112 °. All of these details are related to a point M, which adjusts itself in the centering state of the nozzle retaining nut 10.
  • the point M begins when the nozzle retaining nut 10 is pressed into the cylinder head 40 along the concave chamfer 124 in the direction of the point A (and of course linearly along the sealing seat edge 422) (point Mn), with a straight line MnA of the tangent T A becoming more and more approaches. This is detailed in the sectional view of the Fig. 4 clarified.
  • Mn is a radially outermost point of contact between concave chamfer 124 and sealing seat edge 422
  • the Fig. 5a shows a second embodiment of the sealing device according to the invention for the fuel injector 1 and the nozzle lock nut 10, wherein not the concave chamfer 124 at the edge 424 of the sealing seat edge 422 centered, but the lower edge of the sealing seat edge 422.
  • This has the advantage that the injector bore 42 in diameter can be made smaller and can come closer to the injection nozzle 20 of the fuel injector 1.
  • the upper edge of the concave chamfer 124 may also be seated alone on the sealing seat edge 422 (circle (ring) A, largest diameter of the concave chamfer 124).
  • the sealing state shows Fig. 5b , wherein the two circles or circular edges I and A are pressed into the sealing seat edge 422 of the cylinder head 40 and form two sealing regions in the illustrated case.
  • Other configurations of the sealing state in which z. B. imprint only the lowest circle edge I or only the top circle edge A in the sealing seat edge 422.
  • the nozzle retaining nut 10 there is no cavity between the nozzle retaining nut 10 and the cylinder head 40.
  • this vent closes automatically by the Pressing the nozzle lock nut 10 in the cylinder head 40.
  • This can, for. B. done by a groove in the cylinder head 40 or in the nozzle lock nut 10, in which material of the nozzle retaining nut 10 and material of the cylinder head 40 penetrates during insertion.
  • holes are suitable which can be closed in a similar way.

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  • 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)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Closing Of Containers (AREA)
EP06706983A 2005-02-15 2006-02-15 Dichtungseinrichtung für einen kraftstoffinjektor sowie verfahren zum abdichten Not-in-force EP1848891B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005006818A DE102005006818A1 (de) 2005-02-15 2005-02-15 Dichtungseinrichtung für einen Kraftstoffinjektor sowie Verfahren zum Abdichten
PCT/EP2006/001381 WO2006087186A1 (de) 2005-02-15 2006-02-15 Dichtungseinrichtung für einen kraftstoffinjektor sowie verfahren zum abdichten

Publications (2)

Publication Number Publication Date
EP1848891A1 EP1848891A1 (de) 2007-10-31
EP1848891B1 true EP1848891B1 (de) 2010-04-14

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP06706983A Not-in-force EP1848891B1 (de) 2005-02-15 2006-02-15 Dichtungseinrichtung für einen kraftstoffinjektor sowie verfahren zum abdichten

Country Status (7)

Country Link
US (1) US7559312B2 (enExample)
EP (1) EP1848891B1 (enExample)
JP (1) JP4664990B2 (enExample)
CN (1) CN101146994B (enExample)
AT (1) ATE464473T1 (enExample)
DE (2) DE102005006818A1 (enExample)
WO (1) WO2006087186A1 (enExample)

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Publication number Publication date
CN101146994B (zh) 2012-08-29
WO2006087186A1 (de) 2006-08-24
EP1848891A1 (de) 2007-10-31
DE102005006818A1 (de) 2006-08-17
JP2008530427A (ja) 2008-08-07
US7559312B2 (en) 2009-07-14
JP4664990B2 (ja) 2011-04-06
CN101146994A (zh) 2008-03-19
US20080156298A1 (en) 2008-07-03
ATE464473T1 (de) 2010-04-15
DE502006006694D1 (de) 2010-05-27

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