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EP0853725B1 - Soupape d'injection de carburant - Google Patents

Soupape d'injection de carburant Download PDF

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Publication number
EP0853725B1
EP0853725B1 EP97918045A EP97918045A EP0853725B1 EP 0853725 B1 EP0853725 B1 EP 0853725B1 EP 97918045 A EP97918045 A EP 97918045A EP 97918045 A EP97918045 A EP 97918045A EP 0853725 B1 EP0853725 B1 EP 0853725B1
Authority
EP
European Patent Office
Prior art keywords
valve seat
valve
seat body
opening
fuel injection
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
EP97918045A
Other languages
German (de)
English (en)
Other versions
EP0853725A1 (fr
Inventor
Hans-Dieter Schmid
Peter Romann
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 EP0853725A1 publication Critical patent/EP0853725A1/fr
Application granted granted Critical
Publication of EP0853725B1 publication Critical patent/EP0853725B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664Injectors 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
    • F02M51/0671Injectors 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
    • F02M51/0682Injectors 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 the body being hollow and its interior communicating with the fuel flow
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1806Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1853Orifice plates

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 after finishing in the valve seat body provided valve seat on an end face of the Valve seat body is welded an orifice plate. This creates stresses in the valve seat body, which among other things, the roundness of the valve seat surface deteriorate, causing the tightness of the Fuel injector in the closed state is influenced and unwanted from the closed Fuel injector fuel in small quantities leaks.
  • the fuel injector according to the invention with the characteristic features of claim 1 has in contrast the advantage that it is avoided in a simple manner, that the weld of the spray plate to the Valve seat body the roundness of the valve seat surface deteriorates, causing a when the valve is closed Leakage reduction is achieved.
  • the Valve seat surface Through the groove in the front of the valve seat body is the Valve seat surface mechanically and thermally decoupled and is thus no tension caused by welding exposed. Deformations caused by heat Valve seat bodies are from the area of the Valve seat body in which the weld he follows.
  • valve housing Provide longitudinal opening into which the valve seat body is inserted, and in the area of the lower end of the Valve seat body in the direction away from the valve seat body Extension opening with a larger cross section than that Provide longitudinal opening with the wall of the Spray plate connected by a second weld is.
  • 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 partial representation of 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.
  • 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 circumferential groove 18.
  • a bottom part 20 of a z. B. cup-shaped spray plate 21 is located its upper end face 19 on the lower end face 17 of Valve seat body 16 and is concentric and fixed with this connected by a first weld 31.
  • Central area 24 has the bottom part 20 of the Spray plate 21 at least one spray hole 25, for example four formed by eroding or stamping Spray holes 25 on.
  • 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 second weld seam 30 intended.
  • a welding edge 33 is formed, on the of the first circumferential weld 31 the bottom part 20 tightly the valve seat body 16 is connected.
  • valve seat body 16 and spray plate 21 and of Spray plate 21 and valve housing 1 A tight connection of valve seat body 16 and spray plate 21 and of Spray plate 21 and valve housing 1 is required 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 housing 1 and the retaining edge 26 of the pot-shaped spray perforated disk 21 directly into a 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 exact stroke setting for the valve closing body 7 takes place by bending the spray orifice plate 21 between the welds 30, 31 in the axial direction.
  • the circumferential groove 18 on the lower end face 17 of the Valve seat body 16 causes that when attaching the first weld 31 on the spray plate 21 and the Welding edge 33 throttling the heat transfer Valve seat surface 29 takes place so that tensions as a result the thermal and mechanical load only in Welding edge 33 occur and from the valve seat surface 29 in the same way as mechanical stresses are kept away become.
  • the roundness of the valve seat surface 29 thus remains which is a prerequisite for the tightness of the Forms fuel injector in the closed state, receive.
  • the thermal and mechanical decoupling of the Valve seat 29 from the first weld 31 is then especially large when the first weld 31 is nearby the circumference of the valve seat body 16 and the radial
  • the distance between the groove 18 and the first weld 31 is smaller than to the outflow opening 32, so that there is a possible narrow welding edge 33 results.
  • Deviating from the embodiment according to Figure 1 is in the embodiment of Figure 2 in Area of the lower end face 17 of the valve seat body 16 in the direction of the valve closing body 7 away from the Extension opening 40 adjoining longitudinal opening 3 provided that has a larger cross section than that Longitudinal opening 3.
  • the spray perforated disk 21 extends with their holding edge 26 up to the wall of the expansion opening 40 and is through with the wall of the extension opening 40 the circumferential second weld 30 is tightly connected.
  • the air ring gap 41 has, for example, a radial width of approximately 0.2 mm and an axial extension of, for example, about 1 mm.
  • the groove 21 has, for example, a radial width of approximately 0.6 mm and a depth of about 0.5 mm.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)

Claims (4)

  1. Injecteur de carburant pour moteurs à combustion interne, comprenant
    un corps d'injecteur logeant un organe d'obturation (7), mobile, coopérant avec une surface formant siège de soupape réalisée sur un corps (16) formant siège de soupape dont l'extrémité aval se transforme en un orifice de sortie (32) s'étendant jusqu'au niveau d'une face frontale inférieure du corps formant siège de soupape (16), et
    un disque comportant au moins un orifice d'éjection, (21) et fixé contre la face inférieure du corps formant siège de soupape par un premier cordon de soudure,
    caractérisé en ce que
    la face frontale inférieure (17) du corps formant siège de soupape (16) comporte, entre l'orifice de sortie (32) et le premier cordon de soudure (31), une rainure (18) entourant l'orifice de sortie (32) à une certaine distance radiale.
  2. Injecteur de carburant selon la revendication 1,
    caractérisé en ce que
    le premier cordon de soudure (31) est situé à proximité de la périphérie du corps formant siège de soupape (16) et la distance radiale de la rainure (18) par rapport au premier cordon de soudure (31), est inférieure à celle par rapport à l'orifice de sortie (32).
  3. Injecteur de carburant selon l'une quelconque des revendications 1 ou 2,
    caractérisé en ce que
    le corps d'injecteur (1) comporte une ouverture longitudinale (3) dans laquelle est glissé le corps formant siège de soupape (16) et, au niveau de la face frontale inférieure (17) du corps formant siège de soupape (16), dans la direction à l'opposé de l'organe d'obturation (7), il est prévu une ouverture élargie (40) prolongeant l'ouverture longitudinal (3) avec une plus grande section.
  4. Injecteur de carburant selon la revendication 3,
    caractérisé en ce que
    le disque à orifices d'éjection (21) est relié à la paroi de l'ouverture élargie (40) par un second cordon de soudure (30).
EP97918045A 1996-07-05 1997-03-21 Soupape d'injection de carburant Expired - Lifetime EP0853725B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19627090 1996-07-05
DE19627090A DE19627090A1 (de) 1996-07-05 1996-07-05 Brennstoffeinspritzventil
PCT/DE1997/000577 WO1998001665A1 (fr) 1996-07-05 1997-03-21 Soupape d'injection de carburant

Publications (2)

Publication Number Publication Date
EP0853725A1 EP0853725A1 (fr) 1998-07-22
EP0853725B1 true EP0853725B1 (fr) 2001-08-29

Family

ID=7799015

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97918045A Expired - Lifetime EP0853725B1 (fr) 1996-07-05 1997-03-21 Soupape d'injection de carburant

Country Status (8)

Country Link
EP (1) EP0853725B1 (fr)
JP (1) JPH11512167A (fr)
KR (1) KR19990028585A (fr)
BR (1) BR9706538A (fr)
DE (2) DE19627090A1 (fr)
ES (1) ES2163754T3 (fr)
RU (1) RU2173788C2 (fr)
WO (1) WO1998001665A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6378792B2 (en) * 1998-04-10 2002-04-30 Aisan Kogyo Kabushiki Kaisha Fuel injection nozzle
DE10118164B4 (de) * 2001-04-11 2007-02-08 Robert Bosch Gmbh Brennstoffeinspritzventil
JP4077004B2 (ja) 2005-10-27 2008-04-16 三菱電機株式会社 燃料噴射弁装置
JP5921240B2 (ja) * 2012-02-10 2016-05-24 日立オートモティブシステムズ株式会社 燃料噴射弁

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4026721A1 (de) * 1990-08-24 1992-02-27 Bosch Gmbh Robert Einspritzventil und verfahren zur herstellung eines einspritzventils

Also Published As

Publication number Publication date
DE19627090A1 (de) 1998-01-08
BR9706538A (pt) 1999-07-20
WO1998001665A1 (fr) 1998-01-15
EP0853725A1 (fr) 1998-07-22
RU2173788C2 (ru) 2001-09-20
ES2163754T3 (es) 2002-02-01
DE59704441D1 (de) 2001-10-04
JPH11512167A (ja) 1999-10-19
KR19990028585A (ko) 1999-04-15

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