EP0774069B1 - Soupape d'injection de carburant pour moteurs a combustion interne - Google Patents

Soupape d'injection de carburant pour moteurs a combustion interne Download PDF

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Publication number
EP0774069B1
EP0774069B1 EP96900279A EP96900279A EP0774069B1 EP 0774069 B1 EP0774069 B1 EP 0774069B1 EP 96900279 A EP96900279 A EP 96900279A EP 96900279 A EP96900279 A EP 96900279A EP 0774069 B1 EP0774069 B1 EP 0774069B1
Authority
EP
European Patent Office
Prior art keywords
valve
injection
seat body
disc
hole
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
EP96900279A
Other languages
German (de)
English (en)
Other versions
EP0774069A1 (fr
Inventor
Clemens Willke
Klaus Franzke
Hartmut Albrodt
Norbert Belzner
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 EP0774069A1 publication Critical patent/EP0774069A1/fr
Application granted granted Critical
Publication of EP0774069B1 publication Critical patent/EP0774069B1/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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • 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
    • 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0671—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S239/00—Fluid sprinkling, spraying, and diffusing
    • Y10S239/90—Electromagnetically actuated fuel injector having ball and seat type valve

Definitions

  • the invention is based on a fuel injector according to the genus of claim 1. It's already a Fuel injector known (DE 42 21 185 A1), in which at very high engine and fuel temperatures Reduction of the amount of fuel injected (emaciation) occurs especially during hot start and hot idling. This is done in that the valve housing Heat the valve seat body and the spray orifice disk strongly, so that it is between the valve seat body and spray orifice plate or at the spray holes of the spray plate to a Vapor formation comes to a liquid Fuel and vapor bubbles formed two-phase flow leads through the spray holes with per time unit less fuel flow. This will make it Running behavior of the internal combustion engine in an undesirable manner so influenced that it leads to a non-circular run of the Internal combustion engine or even comes to a standstill.
  • the fuel injector according to the invention with the characteristic features of claim 1 has in contrast the advantage that in particular in a simple manner very high engine or fuel temperatures a reduction (emaciation) of the injected The amount of fuel is reduced or avoided entirely, so that the running behavior of the hot internal combustion engine in particular is also improved during hot start or hot idling.
  • the at least one transition element between the Valve seat body and the spray orifice plate reduces the Heat transfer from the valve seat body to Spray plate, decouples them from each other, so that the heat of vaporization required to evaporate the the spray holes sprayed fuel that the Spray plate is withdrawn to cool the Splash hole leads while a flow of heat continues from the valve seat body to the spray orifice plate through the Transitional element reduced or almost completely prevented becomes.
  • cooler spray plate becomes one Vapor formation upstream of the orifice plate or greatly reduced or completely avoided at the spraying holes, so that liquid fuel flows through the spray holes and thus the internal combustion engine, especially during a hot start and hot idling is supplied with sufficient fuel, to start safely and keep going.
  • the at least one transition element as raised body heel on the valve seat body is reduced the contact surface between the valve seat body and Spray plate and thereby forms one Throttling point for heat transfer.
  • At least one Transition element as raised disc heel on the Form spray hole disc, so that at least one Transitional element as a raised body heel on the Valve seat body and at least one transition element as raised disc heel on the spray perforated disc is formed, which also the Contact surface between the valve seat body and the Spray plate reduced and thus the heat transfer is throttled. It is also advantageous to Disc heel through a recessed step or Form arch in the spray orifice plate. It is also advantageous to the body heel or Form the disk shoulder in a circular shape.
  • Embodiments of the invention are in the drawing shown in simplified form and in the following Description explained in more detail.
  • 1 shows a first Embodiment of the invention using a schematic fuel injector shown in partial representation
  • Figure 2 shows a second Embodiment of the invention
  • Figures 3 and 4 two further examples with a disc heel without the body wear according to claim 1, each with a partial representation a fuel injector.
  • FIG. 1 shows an example of what is otherwise already known Fuel injection valve for fuel injection systems from mixture-compression-ignition internal combustion engines partially shown, as the first embodiment is designed according to the invention.
  • the fuel injector has a tubular valve housing 1 in which is concentric a longitudinal opening 3 is formed in a longitudinal valve axis 2. In the longitudinal opening 3 is a z.
  • tubular valve needle 5 arranged at its downstream end 6 with a spherical valve closing body 7, on the circumference for example five circular flats 8 are provided, connected is.
  • the fuel injector is actuated in known way, for example, electromagnetic.
  • electromagnetic For axial Movement of the valve needle 5 and thus to open against the Spring force of a return spring (not shown) or Closing the fuel injector serves an indicated electromagnetic circuit with a magnetic coil 10, an armature 11 and a core 12.
  • the anchor 11 is with the Valve closing body 7 facing away from the end of the valve needle 5 e.g. B. connected and welded by means of a laser the core 12 aligned.
  • valve seat body 16 To guide the valve closing body 7 during the axial movement serves a guide opening 15 of a valve seat body 16.
  • a valve seat body 16 In the downstream end of the core 11 facing away from the core Valve housing 1 is concentric with the valve longitudinal axis 2 extending longitudinal opening 3 of the cylindrical valve seat body 16 inserted.
  • the circumference of the valve seat body 16 has one slightly smaller diameter than the longitudinal opening 3 of the Valve housing 1.
  • the valve closing body 7 Lower end face 17 facing away is valve seat body 16 provided with a raised body shoulder 18 on which a Bottom part 20 a z.
  • B. pot-shaped Spray face plate 21 abuts with its upper end face 19 and is concentrically and firmly connected to this.
  • In his Central area 24 has the bottom part 20 of the Spray plate 21 at least one, for example four through Eroding or punching molded injection holes 25.
  • a circumferential holding edge 26 which is in extends axially away from the valve seat body 16 and is bent conically outwards until its end 27. Since the Circumferential diameter of the valve seat body 16 is smaller than that Diameter of the longitudinal opening 3 of the valve housing 1 is only between the longitudinal opening 3 and the slightly conical externally curved holding edge 26 of the spray plate 21 a radial pressure.
  • the insertion depth of the valve seat body 16 and cup-shaped Spray plate 21 existing valve seat part in the Longitudinal opening 3 determines the default stroke Valve needle 5, since the one end position of the valve needle 5 at non-excited solenoid 10 by the system of Valve closing body 7 on a valve seat surface 29 of the Valve seat body 16 is fixed.
  • the other end position of the Valve needle 5 is, for example, when solenoid 10 is excited fixed by the installation of the anchor 11 on the core 12.
  • the Path between these two end positions of the valve needle 5 thus represents the hub.
  • the holding edge 26 of the spray disk 21 tightly and firmly connected to the wall of the longitudinal opening 3.
  • a circumferential weld seam 30 intended.
  • the bottom part 20 tightly the body shoulder 18 on the end face 17 of the valve seat body 16 connected.
  • valve seat body 16 and Spray plate 21 and spray plate 21 and Valve housing 1 is required so that the fuel is not between the longitudinal opening 3 of the valve housing 1 and the circumference of the valve seat body 16 through to the spray holes 25 or between the longitudinal opening 3 of the valve seat support 1 and the Holding edge 26 of the cup-shaped spray perforated disk 21 therethrough directly into an air intake line of the internal combustion engine can flow.
  • the spherical valve closing body 7 acts with the in Direction of flow tapering in the shape of a truncated cone Valve seat surface 29 of the valve seat body 16 together, which in axial direction between the guide opening 15 and one Outflow opening 32 in the lower end face 17 of the Valve seat body 16 is formed.
  • the valve seat body 16 has a valve seat body opening facing solenoid 10 34 on, which has a larger diameter than that Diameter of the guide opening 15 of the valve seat body 16.
  • the central area 24 of the bottom part 20 of the Spray plate 21 is downstream, for example Direction, ie in the direction pointing away from the valve closing body 7 Direction bent out of the plane of the bottom part 20, so that there is a bulge 36 in the central area.
  • the at least one body heel 18 on the bottom End face 17 of the valve seat body 16 forms a Transition element from the valve seat body 16 to Spray plate 21 and throttles the heat transfer between Valve seat body and spray washer.
  • the Body shoulder 18 annular, in particular concentric to the valve longitudinal axis 2, trained and reduces the Contact surface between the bottom part 20 of the Spray plate 21 and the valve seat body 16.
  • the body shoulder 18 in the axial direction parallel to the longitudinal axis 2 of the valve Height of a few hundredths of a millimeter, for example five hundredths of a millimeter.
  • the width of the body heel 18 in the radial direction, that is to say transversely to the valve longitudinal axis 2 is about one millimeter, for example 0.8 mm.
  • the Location of the body shoulder 18 on the lower end face 17 of the Valve seat body 16 can be selected in a suitable manner between a position near the outflow opening 32 and a location close to the diameter of the Valve seat body 16, i.e. in the vicinity of the longitudinal opening 3.
  • the Transition element between the valve seat body 16 and the Spray plate 21 is used, a thermal decoupling and thus a throttling of the heat transfer between the Valve seat body and the spray orifice plate reached so that even with a hot internal combustion engine during the hot start and the hot idle the heat of vaporization of the Spray holes 25 sprayed fuel is sufficient Spray plate 21 in the region of the collecting space 37 such cool that there and at the spray holes 25 none or there are almost no vapor bubbles that lead to one lead to undesirable running behavior of the internal combustion engine.
  • FIG. 2 is a partial representation Fuel injector shown at the bottom Front 17 of the valve seat body 16, the transition element as a body shoulder is trained. Deviating from the embodiment of the figure In the second embodiment according to FIG. 2, 1 is additionally Transition element as raised disc heel 39 formed over the upper end face 19 of the bottom part 20 protrudes towards the valve seat body 16 and on the body shoulder 18 is applied and by means of circumferential weld 31 is connected to this.
  • the at least one disc heel 39 on z. B. 0.15 mm thick Bottom part 20 of the spray plate 21 is preferred circular and has about the same Dimensions like the body heel 18 at the first Embodiment.
  • the second exemplary embodiment according to FIG. 2 thus represents one Combination in which as a transition element the body heel 18 on Valve seat body 16 and the disc shoulder 39 on Bottom part 20 of the spray plate 21 is used, the Disc heel 39 bears against the body heel 18 and by means of the circumferential weld seam 31 tightly connected to this is.
  • the central area 24 with the at least one spray hole 25 surrounds with a larger diameter, so that from the Level 52 starting up to the circumference of the bottom part 20 of the Disc paragraph 39 is formed, which is at the bottom End face 17 of the valve seat body 16 abuts.
  • the central area 24 with the at least one Spray hole 25 surrounds with a larger diameter, so that starting from the arch 53 to the extent of Bottom part 20 of the disc heel 39 is formed on the lower end face 17 of the valve seat body 16 abuts.
  • Spray hole discs are suitable, but they also apply to only very just designed spray hole discs.

Claims (7)

  1. Injecteur de carburant pour moteur à combustion interne comprenant
    un boítier d'injecteur (1),
    un organe d'obturation (7) mobile qui coopère avec une surface formant siège de soupape (29) réalisée dans un corps formant siège de soupape (16),
    un disque à orifices d'éjection (21) prévu en aval du corps formant siège de soupape et qui comporte au moins un orifice d'éjection (25), et
    au moins un élément de transition (18, 39) en forme d'anneau de cercle prévu entre le corps formant siège de soupape (16) et le disque à orifices d'éjection (21) par lequel le corps formant siège de soupape et le disque à orifices d'éjection se touchent,
    caractérisé en ce que
    dans la direction radiale le disque à orifices d'éjection (21) ne s'appuie nulle part entre au moins un orifice d'éjection (25) et au moins un élément de transition (18, 19), et cet élément de transition (18, 19) diminue le pont thermique entre le corps formant siège de soupape (16) et le disque à orifices d'éjection (21), cet élément de transition étant réalisé sur le corps formant siège de soupape (16) comme bossage (18).
  2. Injecteur de carburant selon la revendication 1,
    caractérisé en ce qu'
    en plus, au moins un élément de transition (39) est réalisé sur le disque à orifices d'éjection (21).
  3. Injecteur de carburant selon la revendication 2,
    caractérisé en ce qu'
    au moins un élément de transition est réalisé sur le disque à orifices d'éjection (21) sous la forme d'un bossage de disque (39).
  4. Injecteur de carburant selon la revendication 3,
    caractérisé en ce que
    le disque à orifices d'éjection (21) possède une zone centrale (24) munie d'au moins un orifice d'éjection (25), et dont la face (19) est tournée vers le corps formant siège de soupape (16), et pour former le bossage de disque (39) qui part de la périphérie, il est prévu un décrochement en creux (52) par rapport à la face supérieure (19) et qui entoure la zone centrale (24) avec un plus grand diamètre.
  5. Injecteur de carburant selon la revendication 3,
    caractérisé en ce que
    le disque à orifices d'éjection (21) présente une zone centrale (24) avec une face supérieure (19) tournée vers le corps formant siège de soupape (16) et ayant au moins un orifice d'éjection (25), et
    une partie bombée en creux (53) par rapport à la face supérieure (19) et qui entoure la zone centrale (24) avec un plus grand diamètre.
  6. Injecteur de carburant selon la revendication 1,
    caractérisé en ce que
    le disque à orifices d'éjection (21) s'applique contre le bossage (18) du corps et est relié à celui-ci.
  7. Injecteur de carburant selon l'une quelconque des revendications 2 à 5,
    caractérisé en ce que
    le disque à orifices d'éjection (21) s'appuie par le bossage de disque (39) contre le corps formant siège de soupape (16) et est y relié à celui-ci.
EP96900279A 1995-02-02 1996-01-17 Soupape d'injection de carburant pour moteurs a combustion interne Expired - Lifetime EP0774069B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19503269A DE19503269A1 (de) 1995-02-02 1995-02-02 Brennstoffeinspritzventil für Brennkraftmaschinen
DE19503269 1995-02-02
PCT/DE1996/000053 WO1996023968A1 (fr) 1995-02-02 1996-01-17 Soupape d'injection de carburant pour moteurs a combustion interne

Publications (2)

Publication Number Publication Date
EP0774069A1 EP0774069A1 (fr) 1997-05-21
EP0774069B1 true EP0774069B1 (fr) 2001-09-26

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ID=7752928

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96900279A Expired - Lifetime EP0774069B1 (fr) 1995-02-02 1996-01-17 Soupape d'injection de carburant pour moteurs a combustion interne

Country Status (10)

Country Link
US (1) US5862991A (fr)
EP (1) EP0774069B1 (fr)
JP (1) JP3625838B2 (fr)
KR (1) KR100441813B1 (fr)
CN (1) CN1062335C (fr)
BR (1) BR9605297A (fr)
DE (2) DE19503269A1 (fr)
ES (1) ES2164862T3 (fr)
RU (1) RU2151905C1 (fr)
WO (1) WO1996023968A1 (fr)

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Also Published As

Publication number Publication date
ES2164862T3 (es) 2002-03-01
RU2151905C1 (ru) 2000-06-27
KR100441813B1 (ko) 2004-11-08
KR970702431A (ko) 1997-05-13
JP3625838B2 (ja) 2005-03-02
DE19503269A1 (de) 1996-08-08
JPH09511308A (ja) 1997-11-11
BR9605297A (pt) 1997-09-16
EP0774069A1 (fr) 1997-05-21
DE59607762D1 (de) 2001-10-31
CN1145655A (zh) 1997-03-19
US5862991A (en) 1999-01-26
CN1062335C (zh) 2001-02-21
WO1996023968A1 (fr) 1996-08-08

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