EP1799996B1 - Soupape d'injection de carburant - Google Patents

Soupape d'injection de carburant Download PDF

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Publication number
EP1799996B1
EP1799996B1 EP05794491A EP05794491A EP1799996B1 EP 1799996 B1 EP1799996 B1 EP 1799996B1 EP 05794491 A EP05794491 A EP 05794491A EP 05794491 A EP05794491 A EP 05794491A EP 1799996 B1 EP1799996 B1 EP 1799996B1
Authority
EP
European Patent Office
Prior art keywords
fuel injection
injection valve
valve according
perforated disc
diameter
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
EP05794491A
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German (de)
English (en)
Other versions
EP1799996A1 (fr
Inventor
Markus Gesk
Guenter Dantes
Joerg Heyse
Andreas Krause
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 EP1799996A1 publication Critical patent/EP1799996A1/fr
Application granted granted Critical
Publication of EP1799996B1 publication Critical patent/EP1799996B1/fr
Active 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
    • F02M61/1853—Orifice plates

Definitions

  • the invention relates to a fuel injection valve according to the preamble of the main claim.
  • a fuel injector is already known in which a perforated disc is provided with a plurality of outlet openings downstream of the valve seat.
  • an inlet opening with a larger diameter is formed between an outlet opening in the valve seat body and the perforated disk, which forms an annular inflow cavity for the outlet openings.
  • the outlet openings of the perforated disc are in direct flow communication with the inflow opening and the annular inflow cavity and are thereby from the upper boundary of the inflow opening covered. In other words, there is a complete offset from the outlet opening defining the inlet of the inflow opening and the outlet openings.
  • a fuel injection valve with a perforated disk which has a plurality of functional planes having different opening geometries.
  • the individual functional levels of the perforated disc are built on each other by means of galvanic metal deposition (multilayer electroplating).
  • the valve seat body should in no case limit or cover the inlet openings in the upper functional level of the perforated disc.
  • a fuel injection valve for fuel injection systems of internal combustion engines which has a valve seat body having a fixed valve seat with the valve seat, a valve closing body cooperates, which is axially movable along a valve longitudinal axis.
  • a perforated disc Downstream of the valve seat, a perforated disc is arranged, which has a plurality of outlet openings. The outlet openings extend in the direction of flow widening frustoconically.
  • a circular inflow region is provided, which has a larger diameter than an upstream outlet opening of the valve seat body.
  • the outlet openings themselves are located on a larger diameter than the diameter of the outlet opening, so that a flow deflection takes place radially outward to the outlet openings out.
  • the frusto-conical outlet openings all emanate from this one single inflow area and are accordingly supplied with a flow coming from it.
  • the perforated disk of the fuel injection valve here has no circular inflow region, but an inflow region, which is composed of an inner inflow region and a plurality of outgoing channel-like inflow branches.
  • an inflow region which is composed of an inner inflow region and a plurality of outgoing channel-like inflow branches.
  • the fuel injection valve according to the invention with the characterizing features of the main claim has the advantage that in a simple manner uniform atomization of the fuel is achieved, with a particularly high quality of preparation and Zerstäubungsgüte is achieved with very small fuel droplets.
  • This is achieved in an advantageous manner in that downstream of a valve seat, a perforated disc is provided as atomizing disc with a specific geometry of the outlet openings.
  • fuel sprays can be sprayed off with an atomization quality which is about 20 ⁇ m for the SMD, the so-called Sauter Mean Diameter of the fuel droplets, as an essential measure of the atomization quality.
  • the horizontal velocity components of the flow entering the outlet ports are not obstructed by the wall of the respective outlet port at the entry plane, so that the fuel jet, upon exiting the outlet port, has the full intensity of the horizontal components generated in the onflow cavity and therefore fan out with maximum atomization.
  • an inflow opening with the annular Anströmhohlraum is provided in the valve seat body upstream of the outlet openings, which is greater than an outlet opening downstream of the valve seat.
  • the valve seat body already assumes the function of influencing the flow in the perforated disc.
  • the formation of the inflow opening achieves an S-blow in the flow for atomization improvement of the fuel, since the valve-seat body with the upper boundary of the inflow opening covers the outlet openings of the perforated disk.
  • the perforated disks can be produced in a reproducible manner in an extremely precise and cost-effective manner in very large numbers simultaneously.
  • this production allows an extremely large design freedom, since the contours of the openings in the perforated disc can be selected freely.
  • FIG. 1 a partially illustrated injection valve
  • FIG. 2 the section II in FIG. 1 with a Anströmhohlraum in the valve seat body and a plurality of outlet openings having perforated disc in an enlarged view
  • FIG. 3 A first embodiment of an inventively shaped outlet
  • FIG. 4 A second embodiment of an inventively shaped outlet opening
  • FIGS. 5A to 5C three production steps of producing a perforated disk according to the invention in the region of an outlet opening.
  • FIG. 1 As an exemplary embodiment, a valve in the form of an injection valve for fuel injection systems of mixture-compression spark-ignition internal combustion engines is partially shown.
  • the injection valve has a tubular valve seat carrier 1, which forms only part of a valve housing and in which a longitudinal opening 3 is formed concentrically to a valve longitudinal axis 2.
  • a longitudinal opening 3 In the longitudinal opening 3 is a z.
  • the actuation of the injection valve takes place in a known manner, for example electromagnetically.
  • a schematically indicated electromagnetic circuit with a solenoid 10, an armature 11 and a core 12.
  • the armature 11 is connected to the valve closing body. 7 opposite end of the valve needle 5 by eg a trained by a laser weld and aligned with the core 12.
  • valve seat body 16 In the downstream end of the valve seat carrier 1 is a valve seat body 16, e.g. tightly assembled by welding. On its lower end face 17 facing away from the valve closing body 7, the valve seat body 16 is stepped, with a depression 20 being provided in a middle region around the valve longitudinal axis 2, in which a flat, single-pored perforated disk 23 is introduced.
  • the perforated disc 23 has a plurality of outlet openings 24, ideally up to four hundred outlet openings 24 due to the small opening widths.
  • an inflow opening 19 Upstream of the recess 20 and thus of the outlet openings 24 of the perforated disc 23, an inflow opening 19 is provided in the valve seat body 16, via which the individual outlet openings 24 are flowed.
  • the inflow opening 19 has a diameter which is greater than the opening width of an outlet opening 27 in the valve seat body 16, from which the fuel flows into the inflow opening 19 and ultimately into the outlet openings 24.
  • the inflow opening 19 is designed in the immediate inflow region of the outlet openings 24 with a special geometry.
  • the opposite of the outlet opening 27 larger diameter annular region of the inflow opening 19 is in the FIG. 2 shown enlarged and is referred to below as Anströmhohlraum 26.
  • valve seat body 16 and perforated disc 23 are effected for example by a circumferential and dense, formed by a laser weld 25, which is placed outside of the inflow opening 19. After attachment of the perforated disc 23, this is sunk in the recess 20 opposite the end face 17th
  • the insertion depth of the valve seat body 16 with the perforated disc 23 in the longitudinal opening 3 determines the size of the stroke of the valve needle 5, since the one end position of the valve needle 5 at non-energized solenoid 10 by the system of the valve closing body 7 at a downstream conically tapered valve seat surface 29 of the valve seat body 16 is set.
  • the other end position of the valve needle 5 is fixed in the excited magnet coil 10, for example, by the system of the armature 11 to the core 12. The path between these two end positions of the valve needle 5 thus represents the hub.
  • the outlet openings 24 of the perforated disc 23 are in direct flow communication with the inflow opening 19 and the annular inflow cavity 26 and are thereby covered by the upper boundary of the inflow opening 19. In other words, there is a complete offset of the outlet opening 27 and the outlet openings 24 defining the inlet of the inflow opening 19. Due to the radial offset of the outlet openings 24 with respect to the outlet opening 27 results in an S-shaped flow pattern of the medium, here the fuel.
  • the perforated disc 23 is produced by means of galvanic metal deposition, wherein the production of the single-layer perforated disc 23 is particularly advantageous with the technique of the so-called lateral overgrowth, based on the FIGS. 5A to 5C is explained in more detail.
  • FIG. 2 shows an enlarged section II in FIG. 1 to clarify the geometry of the Anströmhohlraums 26 between a boundary surface 30 of the valve seat body 16 and the perforated disc 23 and the geometry of the outlet openings 24 in the perforated disc 23.
  • Der Valve seat body 16 is configured, for example, such that the boundary surface 30, starting from the outlet opening 27, slopes away from the perforated disc 23 in a radially outwardly inclined manner.
  • entry planes 31 of the outlet openings 24, which extend perpendicular to the valve longitudinal axis 2, have an ever smaller height of the onflow cavity 26 (decrease in the height of the oncoming cavity 26, for example from 100 ⁇ m to 30 ⁇ m) and the flow on the way to the radially outer outlet openings 24 is constantly accelerated.
  • the up to four hundred outlet openings 24 are arranged, for example, on a plurality of concentric circular paths in the perforated disc 23.
  • the distances between the individual outlet openings 24 are, for example, approximately 120 to 150 ⁇ m.
  • the outlet openings 24 ideally have a trumpet-shaped contour, wherein an upstream inflow region 33 has a cylindrical cross-section.
  • the inflow region 33 has a significantly larger diameter than an immediately following opening region of the actual trumpet-shaped outlet opening 24.
  • FIGS. 3 and 4 illustrate two embodiments of inventively shaped outlet openings 24th
  • the thickness H1 of the entire perforated disc 23 is about 50 to 100 microns.
  • the inflow region 33 of the outlet opening 24 only has a height H2 of approximately 3 to 5 ⁇ m.
  • the diameter D1 of the inflow region 33 of the outlet opening 24 is, for example, of the order of magnitude of approximately 100 to 150 .mu.m and is thus greater than the thickness H1 of the perforated disc 23.
  • This diameter-like inflow region 33 is therefore followed by approximately 3 to 5 .mu.m axial length
  • Outlet opening 24 sharp-edged downstream a significantly smaller diameter portion having a diameter D2 of only about 30 to 100 microns.
  • D2 is thus the narrowest diameter of the entire outlet opening 24.
  • the outlet opening 24 widens, for example, continuously curved, in particular in a trumpet shape with a constant radius R of the curvature of the wall in the downstream direction.
  • a diameter D3 at the exit plane 34 of the outlet opening 24 is achieved, which largely corresponds to the diameter D1 of the entry plane 31 and thus to the inflow region 33 and therefore also amounts to approximately 100 to 150 ⁇ m.
  • FIG. 4 embodiment shown differs from the in FIG. 3 in particular, in that the trumpet-shaped opening area is subdivided into two sections, wherein a first upstream section 35 has a substantially cylindrical contour, while the second downstream section 36 has a funnel-shaped contour.
  • a thickness H1 of the perforated disc 23 of approximately 50 to 100 ⁇ m
  • the first cylindrical portion 35 has a length H3 of approximately 20 to 50 ⁇ m.
  • the radii R of the curvatures of the walls of both embodiments of the outlet openings 24 are ideally constant and have their center exactly in the lower boundary angle of the Einström Symposiume.33.
  • FIGS. 5A to 5C the production steps of the production of the perforated disc 23 according to the invention are explained in particular in the region of an outlet opening 24.
  • a substrate body 37 two photoresist layers 38, 39 are deposited on each other.
  • the second lacquer layer 39 is applied only after the masking, exposure and patterning of the first lacquer layer 38.
  • both lacquer layers 38, 39 are developed in one step, ie unexposed areas of the lacquer layers 38, 39 are removed by wet-chemical means.
  • the coater tower 40 has a significantly larger diameter than in the second lacquer layer 39, which, however, is applied at a significantly greater height.
  • metal is electroplated onto the substrate body 37 around the paint towers 40 in a one-step process.
  • the electroplating layer 41 initially grows up from the substrate body 37 on the first lacquer layer 38, and overgrows this first lacquer layer 38 on its surface until the electroplating layer 41 completely touches the circumference of the second lacquer layer 39.
  • the electroplating is stopped at the moment in which a small galvanic layer thickness is present at the periphery of the second lacquer layer 39.
  • the overgrowth of the first lacquer layer 38 results in a desired funnel-shaped or trumpet-shaped indentation in the galvanic layer 41 ("lateral overgrowth") around the second lacquer layer 39 in the region of each paint tower 40. This indentation on each coating tower 40 ultimately forms the strongly diverging part of the respective outlet opening 24 in the perforated disc 23.
  • FIG. 5C After removing the paint towers 40 ("stripping") and the substrate body 37 is a single-layer perforated disc 23 with a plurality of outlet openings 24 before ( FIG. 5C ). Like the arrow in FIG. 5C indicates, the outlet openings 24 of the perforated disc 23 are flowed through in the installed state in the electroplating growth direction.
  • the cylindrical portion 35 of FIG. 4 shown outlet opening 24 with the narrowest cross section is formed by molding the second lacquer layer 39 with high precision.

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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 (13)

  1. Soupape d'injection de carburant pour installations d'injection de carburant de moteurs à combustion interne, comprenant un axe longitudinal de soupape (2), un corps de soupape (16) présentant un siège de soupape fixe (29), un corps de fermeture de soupape (7) coopérant avec le siège de soupape (29), qui peut être déplacé axialement le long de l'axe longitudinal de soupape (2), et un disque perforé (23) disposé en aval du siège de soupape (29), qui possède une pluralité d'ouvertures de sortie (24), caractérisée en ce que les ouvertures de sortie (24) possèdent chacune une région d'afflux amont propre (33) cylindrique périphérique, dont le diamètre D1 est nettement supérieur au diamètre D2 d'une région suivante à arête vive immédiatement en aval, qui forme la section transversale la plus étroite de l'ouverture de sortie (24) et depuis laquelle l'ouverture de sortie (24) s'élargit dans la direction d'écoulement jusqu'à un diamètre D3.
  2. Soupape d'injection de carburant selon la revendication 1, caractérisée en ce que le disque perforé (23) a une épaisseur H1 de 50 à 100 µm.
  3. Soupape d'injection de carburant selon la revendication 1 ou 2, caractérisée en ce que la région d'afflux (33) a une hauteur H2 de 3 à 5 µm.
  4. Soupape d'injection de carburant selon l'une quelconque des revendications précédentes, caractérisée en ce que la région d'afflux (33) a un diamètre D1 de 100 à 150 µm.
  5. Soupape d'injection de carburant selon la revendication 4, caractérisée en ce que l'ouverture de sortie (24) a son plus petit diamètre D2 dans la transition à arête vive de la région d'afflux (33), qui vaut 30 à 100 µm.
  6. Soupape d'injection de carburant selon la revendication 4 ou 5, caractérisée en ce que l'ouverture de sortie (24) s'élargit jusqu'à un diamètre D3 de 100 à 150 µm.
  7. Soupape d'injection de carburant selon l'une quelconque des revendications précédentes, caractérisée en ce que depuis la transition à arête vive de la région d'afflux (33), l'ouverture de sortie (24) présente un contour en forme de trompette ou d'entonnoir.
  8. Soupape d'injection de carburant selon la revendication 7, caractérisée en ce que la courbure de la paroi de l'ouverture de sortie (24) s'étend avec un rayon constant R.
  9. Soupape d'injection de carburant selon la revendication 8, caractérisée en ce que le rayon R de la courbure de la paroi a son centre dans l'angle de délimitation inférieur de la région d'afflux (33).
  10. Soupape d'injection de carburant selon l'une quelconque des revendications précédentes, caractérisée en ce que la région d'ouverture se raccordant à la région d'afflux (33) est divisée en deux portions (35, 36), une première portion amont (35) de contour cylindrique et une deuxième portion aval (36) de contour en forme d'entonnoir.
  11. Soupape d'injection de carburant selon l'une quelconque des revendications précédentes, caractérisée en ce que le disque perforé (23) présente jusqu'à quatre cents ouvertures de sortie (24).
  12. Soupape d'injection de carburant selon l'une quelconque des revendications précédentes, caractérisée en ce qu'une cavité d'afflux (26) réalisée en amont du disque perforé (23) est réalisée sous forme inclinée en biais.
  13. Soupape d'injection de carburant selon l'une quelconque des revendications précédentes, caractérisée en ce que le disque perforé (23) peut être fabriqué avec une seule couche au moyen d'un dépôt galvanique de métal.
EP05794491A 2004-10-09 2005-09-20 Soupape d'injection de carburant Active EP1799996B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004049280A DE102004049280A1 (de) 2004-10-09 2004-10-09 Brennstoffeinspritzventil
PCT/EP2005/054698 WO2006040246A1 (fr) 2004-10-09 2005-09-20 Soupape d'injection de carburant

Publications (2)

Publication Number Publication Date
EP1799996A1 EP1799996A1 (fr) 2007-06-27
EP1799996B1 true EP1799996B1 (fr) 2010-03-24

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EP05794491A Active EP1799996B1 (fr) 2004-10-09 2005-09-20 Soupape d'injection de carburant

Country Status (6)

Country Link
US (1) US20090200402A1 (fr)
EP (1) EP1799996B1 (fr)
JP (1) JP4646256B2 (fr)
CN (1) CN101035980B (fr)
DE (2) DE102004049280A1 (fr)
WO (1) WO2006040246A1 (fr)

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DE102008042116B4 (de) * 2008-09-15 2019-12-24 Robert Bosch Gmbh Ventil, zum Zerstäuben von Fluid
JPWO2010055927A1 (ja) * 2008-11-14 2012-04-12 日立オートモティブシステムズ株式会社 燃料噴射装置
DE102010029298A1 (de) * 2010-05-26 2011-12-01 Robert Bosch Gmbh Ventilanordnung zur Dosierung eines fluiden Mediums in einen Abgasstrang einer Brennkraftmaschine
KR101337713B1 (ko) * 2012-12-20 2013-12-06 주식회사 현대케피코 연료 미립화 밸브 시트 바디를 구비한 차량용 고압 직분식 인젝터
WO2014170956A1 (fr) * 2013-04-16 2014-10-23 三菱電機株式会社 Soupape d'injection de carburant
WO2015068516A1 (fr) * 2013-11-11 2015-05-14 株式会社エンプラス Structure de fixation de plaque de buses pour dispositif d'injection de carburant
DE102013225948A1 (de) * 2013-12-13 2015-06-18 Continental Automotive Gmbh Düsenkopf und Fluid-Einspritzventil
DE102015210487A1 (de) 2015-06-09 2016-12-15 Robert Bosch Gmbh Spritzlochbauteil einer Einspritzvorrichtung
WO2019133585A1 (fr) * 2017-12-26 2019-07-04 3M Innovative Properties Company Structure de buse d'injecteur de carburant dotée d'une ouverture de sortie de trou traversant étranglée
US10724486B2 (en) * 2018-03-21 2020-07-28 Delphi Technologies Ip Limited Fluid injector having a director plate
EP4170154A1 (fr) * 2021-10-21 2023-04-26 Heinz Hänggi Stanztechnik Disque atomiseur et procédé de fabrication d'un disque atomiseur

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Also Published As

Publication number Publication date
CN101035980A (zh) 2007-09-12
EP1799996A1 (fr) 2007-06-27
CN101035980B (zh) 2010-12-29
DE502005009285D1 (de) 2010-05-06
US20090200402A1 (en) 2009-08-13
JP2008516136A (ja) 2008-05-15
DE102004049280A1 (de) 2006-04-13
WO2006040246A1 (fr) 2006-04-20
JP4646256B2 (ja) 2011-03-09

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