EP0489124B1 - Soupape d'injection de carburant - Google Patents

Soupape d'injection de carburant Download PDF

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Publication number
EP0489124B1
EP0489124B1 EP91909756A EP91909756A EP0489124B1 EP 0489124 B1 EP0489124 B1 EP 0489124B1 EP 91909756 A EP91909756 A EP 91909756A EP 91909756 A EP91909756 A EP 91909756A EP 0489124 B1 EP0489124 B1 EP 0489124B1
Authority
EP
European Patent Office
Prior art keywords
protective cap
injection valve
fuel injection
fuel
nozzle body
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 - Lifetime
Application number
EP91909756A
Other languages
German (de)
English (en)
Other versions
EP0489124A1 (fr
Inventor
Waldemar Hans
Christian Preussner
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 EP0489124A1 publication Critical patent/EP0489124A1/fr
Application granted granted Critical
Publication of EP0489124B1 publication Critical patent/EP0489124B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F02M61/168—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
    • 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 injector according to the preamble of the main claim.
  • a fuel injector has already been proposed in DE-A-39 27 390, in which a cup-shaped protective cap is provided which has a through opening downstream of the at least one injection opening in its base.
  • the protective cap is intended to prevent damage in the region of the at least one injection opening and to prevent particles from the surroundings of the fuel injection valve which projects into the intake manifold with its nozzle body from being deposited in the region of the at least one injection opening and to narrow the at least one injection opening, as a result of which the injected one Fuel quantity undesirably reduced.
  • the narrow gap formed between the bottom of the protective cap and an end face of the fuel injection valve by a contact section of the protective cap ensures that fuel deposits due to the successive operating and shutdown phases do not lead to an undesirable reduction in the amount of fuel metered by the fuel injection valve, even when the internal combustion engine is operating for a longer period becomes.
  • the fuel injection valve is closed and any fuel present in the gap and the passage opening is partially evaporated due to the increased heating of the internal combustion engine, whereby only the components of the fuel evaporating at lower temperatures evaporate, while those at Components which evaporate higher temperatures are not sufficiently heated, move radially outward in the gap due to the capillary action of the narrow gap and are deposited there, so that the at least one injection opening and the through opening remain free of deposits.
  • the contact section of the protective cap according to DE-A-39 27 390 does not always guarantee an exact axial adjustment of the narrow gap, as is required for the capillary action.
  • the production of the protective cap for series production is complex.
  • a fuel injector according to EP-A-0 357 498 is known in which a disc with elevations is arranged between the bottom of a protective cap and the end face of the fuel injector, the elevations abutting the end face and thus flow channels for the air with large axial cross sections form.
  • the fuel injector according to the invention with the characterizing features of claim 1 has the advantage of simple and inexpensive manufacture and the possibility of an exact axial adjustment of the narrow gap, which is achieved by the surveys in a simple manner.
  • the narrow gap formed between the bottom of the protective cap and the end face of the fuel injection valve exerts a capillary action on the fuel and reliably prevents fuel deposits from having the free flow cross section of the at least one injection opening and the passage opening and thus the amount of fuel metered by the fuel injection valve when the internal combustion engine is operating for a longer period of time undesirably reduce.
  • the protective cap has a radially outwardly projecting retaining collar at its end facing away from the base, in which at least two bulges are formed. These bulges serve to increase the strength of the retaining collar, which serves as a side surface for a sealing ring.
  • the protective cap is made of a metallic material.
  • the protective cap is formed by sheet metal forming.
  • FIG. 1 shows a first embodiment on the left of the longitudinal valve axis and a second exemplary embodiment of a fuel injector designed according to the invention on the right of the longitudinal valve axis
  • FIG. 2 shows a view of the protective cap according to the first exemplary embodiment in the direction of arrow X in FIG. 1.
  • the fuel injector shown in partial view in FIG. 1 essentially corresponds to a fuel injector described in DE-OS 37 10 467 for a fuel injection system of a mixture-compressing spark-ignition internal combustion engine and is used for fuel injection, for example, into the intake manifold of the internal combustion engine.
  • a nozzle body 1 is connected to a valve housing (not shown), in which a valve needle 3 is guided in a guide opening 2.
  • the guide opening 2 ends in the illustrated nozzle body 1 in a backstitch 5, which is followed by a conically tapering valve seat surface 8 in the flow direction of the fuel.
  • a cylindrical transition opening 11 runs between the valve seat surface 8 and a nozzle body end surface 9 of a nozzle body end 10 .
  • valve needle 3 In the closed state of the fuel injector, the valve needle 3 rests with the sealing seat 12 on the valve seat surface 8, while in the open state of the fuel injector Sealing seat 12 is lifted off the valve seat surface 8 and fuel can flow to the transition opening 11.
  • a thin perforated plate 15 is tightly attached to the nozzle body end face 9, for example by welding or soldering, and has at least one injection opening 16 serving for fuel metering in its area covered by the transition opening 11.
  • the two injection openings 16 shown for example penetrate the perforated plate 15 and in the exemplary embodiment shown are inclined with respect to a longitudinal valve axis 17.
  • the inclinations can run such that the fuel jets emerging from the individual injection openings 16 are directed either in the direction of the valve longitudinal axis 17 inwards or away from the valve longitudinal axis 17.
  • the cross section of the injection openings 16 measures the amount of fuel injected per unit of time when the fuel injector is open.
  • the fuel injector is opened electromagnetically in a manner not shown.
  • The, for example, two injection openings 16 are arranged in the perforated plate 15 in such a way that they start from the annular space formed between the pin 13 of the valve needle 3 and the wall of the transition opening 11, the cylindrical pin 13 projecting almost to the perforated plate 15 when the fuel injection valve is closed.
  • a cup-shaped protective cap 20 is pushed onto the nozzle body end 10 and partially surrounds the nozzle body 1 in the axial direction with a cylinder jacket 21.
  • FIG. 2 which shows a view of the protective cap 20 according to the first exemplary embodiment in the direction of the arrow X in FIG. 1, are shown on the cylinder jacket 21 the protective cap 20, for example Four inwardly directed latching shoulders 22 are formed, which engage in an annular groove 23, for example, of the nozzle body 1 and thus serve to fix the protective cap 20 on the nozzle body 1.
  • the protective cap 20 is connected to the nozzle body 1 by notching the material of the protective cap 20 in the region of the annular groove 23 of the nozzle body 1 such that, for example, a circumferential retaining collar of the protective cap 20 engages in the annular groove 23 of the nozzle body 1.
  • a second exemplary embodiment according to the invention which is shown on the right of the longitudinal valve axis 17 in FIG. 1 and differs from the first exemplary embodiment only in the type of connection of the protective cap 20 to the nozzle body 1, at least two are inward on the cylinder jacket 21 for this purpose projecting retaining tongues 25 are formed, which snap into the circumferential annular groove 23 of the nozzle body 1, for example.
  • a base 28 of the protective cap 20 has a through opening 29 concentric to the longitudinal axis 17 of the valve and extends in the radial direction over the perforated plate 15 to the cylinder jacket 21.
  • At least three elevations 30 are formed from the base 28, which have approximately the same distance from one another and protrude from the bottom 28 at a predetermined axial distance 31 in the direction of the nozzle body end 10 of the nozzle body 1. For example, four elevations 30 are shown in FIG.
  • the protective cap 20 lies with flat or sharp-edged contact surfaces 32 of the elevations 30 on the perforated plate 15 of the fuel injector.
  • an annular gap 36 is formed between the bottom 28 of the protective cap 20 and the end face 35 of the fuel injector formed by the perforated plate 15, which gap, due to the predetermined axial distance 31 with which the protrusions 30 protrude from the bottom 28, has an exactly definable extent in the direction the valve longitudinal axis 17.
  • the axial distance 31 and thus the axial extent of the gap 36 is small compared to the diameter of the through opening 29 of the protective cap 20.
  • the gaps 30 divide the gap 36 by sector.
  • the annular gap 36 exerts such a large capillary action on the fuel regardless of the open state of the fuel injector that the fuel present in the gap 36 does not flow out of the passage opening 29 due to its weight.
  • the narrow gap 36 can taper or widen starting from the through opening 29 with increasing radial extension in the axial direction.
  • the fuel injection valve is closed and any fuel present in the gap 36 and the passage opening 29 is partially evaporated due to the increased heating of the internal combustion engine, only the components of the fuel evaporating at lower temperatures evaporate, while the components evaporating at higher temperatures are not sufficiently heated and move radially outward through the capillary action in the annular gap 36, where they are deposited on the wall 38 of the cylinder jacket 21, so that the through opening 29 and the perforated plate 15 in The area of, for example, two injection openings 16 remain free of fuel deposits.
  • the protective cap 20 has at its end facing away from the bottom 28 a radially outwardly pointing retaining collar 40.
  • a radially outwardly pointing retaining collar 40 For example, four bulges 41 are formed in the retaining collar 40, which serve to increase the strength of the retaining collar 40 and protrude from the retaining collar 40 with an axial distance 42 in the direction of the bottom 28 of the protective cap 20.
  • Both the elevations 30 and the bulges 41 can, in addition to the circular shape shown in the two exemplary embodiments, be configured in any other way, for example oval, rectangular, notch-shaped or annular.
  • the retaining collar 40 with its end face 43 facing away from the bottom 28 and a retaining ring 45 which is arranged on the circumference of the nozzle body 1 facing away from the nozzle body end 10 form the side surfaces of an annular groove 46, the groove base 47 of which is formed by the circumference of the nozzle body 1.
  • a sealing ring 48 is arranged, which enables a reliable and secure seal between the nozzle body 1 of the fuel injector and a valve receptacle, not shown, surrounding the fuel injector.
  • the protective cap 20 is formed, for example, from a metallic material. Due to the generally higher thermal conductivity of metallic materials compared to plastics and the associated improved heat dissipation of a metallic protective cap 20, condensation effects acting on the fuel occur. After the internal combustion engine, and thus also the fuel injection system, has been switched off, the evaporation of the low-boiling components of the fuel and thus the deposits of the higher-boiling components in the annular gap 36 are substantially reduced. The risk of deposits in the region of, for example, two injection openings 16 and the through opening 29 of the protective cap 20 is further reduced.
  • a simple and inexpensive manufacture of a metal protective cap 20 according to the invention is made possible by forming the protective cap 20 together with the elevations 30, the holding collar 40 and the bulges 41 by sheet metal forming.
  • the sheet thickness of the to be formed Sheet is, for example, 0.5 mm. However, it is also possible to form the metal protective cap 20 by machining.
  • the protective cap 20 attached to the nozzle body 1 of the fuel injection valve not only serves to protect the at least one injection opening 16 from damage and the deposition of particles, but also to avoid deposits of higher-boiling components of the fuel in the region of the at least one injection opening 16 and the through opening 29, since the narrow annular gap 36 exerts a capillary action on the fuel and the higher-boiling components of the fuel are deposited therein.

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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)

Abstract

Dans les soupapes d'injection de carburant proposées, une coiffe deprotection en forme générale de pot présente un évidement s'étendant radialement vers l'extérieur et formant avec la soupape d'injection de carburant, une fente tellement étroite que celle-ci exerce un effet capillaire sur le carburant, de sorte que lors d'un arrêt du moteur à combustion interne, les constituants du carburant à hauts points d'ébullition se déposent par capillarité sur le bord extérieur radial de la fente, les ouvertures d'injection demeurant ainsi exemptes d'incrustations. La coiffe de protection (20) selon l'invention présente au moins trois bossages (30) profilés à partir de sa base (28) et émergeant à une distance axiale prédéterminée (31) en direction de la soupape d'injection de carburant, bossages au moyen desquels la coiffe (20) s'applique sur la plaque perforée (15) de ladite soupape. Ceci permet d'obtenir de façon simple une fente axiale déterminée (36) entre la base (28) et la plaque perforée (15). La coiffe de protection peut être utilisée sur des soupapes d'injection de carburant de types variés.

Claims (9)

  1. Injecteur de carburant comprenant un corps (1) sur lequel est fixé un capuchon protecteur (20) en forme de pot ayant un fond (28) qui comporte au moins un orifice d'injection (16), et un orifice traversant (29) sensiblement concentrique à l'axe longitudinal (17) de l'injecteur et au moins un volume situé en amont du fond (28) du capuchon protecteur (20) et qui est ouvert en direction de l'orifice de passage (29), injecteur caractérisé en ce que le capuchon protecteur (20), est muni d'au moins trois bossages (30) mis en forme et qui sont en saillie en direction de l'injecteur, d'une faible distance axiale (31), prédéterminée pour s'appuyer contre la face frontale (35) de l'injecteur pour que le volume compris entre la face frontale (35) de l'injecteur et le fond (28) forment un intervalle (36) à effet capillaire.
  2. Injecteur selon la revendication 1, caractérisé en ce que l'intervalle (36) est subdivisé en des secteurs par les bossages (30).
  3. Injecteur selon la revendication 1 ou 2, caractérisé en ce que la capuchon protecteur (20) comporte à son extrémité opposée au fond (28) une collerette (40) radialement en saillie et qui est munie d'au moins deux parties bombées (41).
  4. Injecteur selon la revendication 1, caractérisé en ce que le capuchon protecteur (20) est en une matière métallique.
  5. Injecteur selon la revendication 4, caractérisé en ce que le capuchon protecteur (20) est réalisé par la mise en forme de tôle.
  6. Injecteur selon la revendication 1, caractérisé en ce que le capuchon protecteur (20) est relié au corps d'injecteur (1) par collage.
  7. Injecteur selon la revendication 1, caractérisé en ce qu'à la périphérie du capuchon protecteur (20) il y a au moins deux languettes d'accrochage (25) en saillie vers l'intérieur et qui viennent s'accrocher dans une rainure annulaire (23) du corps d'injecteur (1).
  8. Injecteur selon la revendication 1, caractérisé en ce qu'à la périphérie du capuchon protecteur (20) il y a au moins deux déformations d'accrochage (22) en saillie vers l'intérieur et qui viennent s'accrocher dans une rainure annulaire (23) du corps (1) de l'injecteur.
  9. Injecteur selon l'une des revendications précédentes, caractérisé en ce que la distance axiale (31) est inférieure au diamètre de l'orifice traversant (29) du capuchon protecteur (20).
EP91909756A 1990-06-21 1991-06-04 Soupape d'injection de carburant Expired - Lifetime EP0489124B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4019752 1990-06-21
DE4019752A DE4019752A1 (de) 1990-06-21 1990-06-21 Brennstoffeinspritzventil
PCT/DE1991/000469 WO1991019900A1 (fr) 1990-06-21 1991-06-04 Soupape d'injection de carburant

Publications (2)

Publication Number Publication Date
EP0489124A1 EP0489124A1 (fr) 1992-06-10
EP0489124B1 true EP0489124B1 (fr) 1995-01-11

Family

ID=6408780

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91909756A Expired - Lifetime EP0489124B1 (fr) 1990-06-21 1991-06-04 Soupape d'injection de carburant

Country Status (7)

Country Link
US (1) US5273215A (fr)
EP (1) EP0489124B1 (fr)
JP (1) JP3193042B2 (fr)
AU (1) AU627979B2 (fr)
DE (2) DE4019752A1 (fr)
ES (1) ES2067232T3 (fr)
WO (1) WO1991019900A1 (fr)

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Publication number Priority date Publication date Assignee Title
JP3440534B2 (ja) * 1994-03-03 2003-08-25 株式会社デンソー 流体噴射ノズル
DE4446241A1 (de) * 1994-12-23 1996-06-27 Bosch Gmbh Robert Brennstoffeinspritzventil
JP3183156B2 (ja) * 1995-04-27 2001-07-03 株式会社デンソー 流体噴射ノズル
US5625946A (en) * 1995-05-19 1997-05-06 Siemens Automotive Corporation Armature guide for an electromechanical fuel injector and method of assembly
DE19522284B4 (de) * 1995-06-20 2007-05-10 Robert Bosch Gmbh Brennstoffeinspritzventil
JP3750126B2 (ja) * 1996-03-26 2006-03-01 株式会社デンソー 燃料噴射弁
DE19736548A1 (de) * 1997-08-22 1999-02-25 Bosch Gmbh Robert Brennstoffeinspritzventil
US6161649A (en) * 1998-09-18 2000-12-19 Uniwave, Inc. Oil lubricator apparatus with improved low flow rate characteristics
US6360960B1 (en) * 2000-05-17 2002-03-26 Siemens Automotive Corporation Fuel injector sac volume reducer
US6334576B1 (en) 2000-06-30 2002-01-01 Siemens Automotive Corporation Fuel injector having a ball seat with multiple tip geometry
DE10059420A1 (de) * 2000-11-30 2002-06-06 Bosch Gmbh Robert Brennstoffeinspritzventil
DE10130685A1 (de) 2001-06-26 2003-01-02 Bosch Gmbh Robert Brennstoffeinspritzventil
DE10130684A1 (de) * 2001-06-26 2003-02-06 Bosch Gmbh Robert Brennstoffeinspritzventil
JP3969247B2 (ja) * 2001-11-06 2007-09-05 株式会社デンソー 燃料噴射弁
US6820598B2 (en) * 2002-03-22 2004-11-23 Chrysalis Technologies Incorporated Capillary fuel injector with metering valve for an internal combustion engine
US7357124B2 (en) * 2002-05-10 2008-04-15 Philip Morris Usa Inc. Multiple capillary fuel injector for an internal combustion engine
US7021570B2 (en) * 2002-07-29 2006-04-04 Denso Corporation Fuel injection device having injection hole plate
US7337768B2 (en) * 2004-05-07 2008-03-04 Philip Morris Usa Inc. Multiple capillary fuel injector for an internal combustion engine
US20060010886A1 (en) * 2004-07-14 2006-01-19 Clamage Eric D Liquid cryogen dosing system with nozzle for pressurizing and inerting containers
DE102005019837A1 (de) * 2005-04-28 2006-11-02 Robert Bosch Gmbh Brennstoffeinspritzventil und Verfahren zu dessen Montage
JP4669852B2 (ja) * 2007-03-09 2011-04-13 株式会社ケーヒン 電磁式燃料噴射弁
CN105593512B (zh) * 2013-10-01 2018-12-04 恩普乐斯股份有限公司 燃料喷射装置用喷嘴板的安装构造
CN107842453B (zh) * 2016-09-20 2022-04-12 罗伯特·博世有限公司 用于进气口燃料喷射器的燃料喷射模块
US11959446B2 (en) 2021-08-20 2024-04-16 Delphi Technologies Ip Limited Fluid injector having a director plate and a director plate retainer

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Publication number Priority date Publication date Assignee Title
US4057190A (en) * 1976-06-17 1977-11-08 Bendix Corporation Fuel break-up disc for injection valve
DE3113466A1 (de) * 1981-04-03 1982-10-14 Klöckner-Humboldt-Deutz AG, 5000 Köln Verfahren zum befestigen einer kappe an einem duesenkoerper
DE8802464U1 (de) * 1988-02-25 1989-06-22 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzventil
FR2635827B1 (fr) * 1988-08-30 1993-11-26 Solex Dispositif d'injection de combustible a chambre d'aeration
DE3836413A1 (de) * 1988-10-26 1990-05-03 Bosch Gmbh Robert Kraftstoff-einspritzduese fuer brennkraftmaschinen

Also Published As

Publication number Publication date
AU627979B2 (en) 1992-09-03
JP3193042B2 (ja) 2001-07-30
AU7890691A (en) 1992-01-07
WO1991019900A1 (fr) 1991-12-26
DE59104245D1 (de) 1995-02-23
ES2067232T3 (es) 1995-03-16
EP0489124A1 (fr) 1992-06-10
JPH05500407A (ja) 1993-01-28
US5273215A (en) 1993-12-28
DE4019752A1 (de) 1992-01-02

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