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EP0917623A1 - Soupape d'injection de carburant - Google Patents

Soupape d'injection de carburant

Info

Publication number
EP0917623A1
EP0917623A1 EP98912280A EP98912280A EP0917623A1 EP 0917623 A1 EP0917623 A1 EP 0917623A1 EP 98912280 A EP98912280 A EP 98912280A EP 98912280 A EP98912280 A EP 98912280A EP 0917623 A1 EP0917623 A1 EP 0917623A1
Authority
EP
European Patent Office
Prior art keywords
valve
sealing element
valve seat
fuel injection
wire
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.)
Withdrawn
Application number
EP98912280A
Other languages
German (de)
English (en)
Inventor
Ferdinand Reiter
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 EP0917623A1 publication Critical patent/EP0917623A1/fr
Withdrawn legal-status Critical Current

Links

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
    • 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
    • F02M51/0635—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding
    • F02M51/066—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature and the valve being allowed to move relatively to each other or not being attached to each other
    • 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
    • F02M51/0635—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding
    • F02M51/0642—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto
    • F02M51/0653—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto the valve being an elongated body, e.g. a needle valve
    • 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
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • 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

Definitions

  • the invention relates to a fuel injector according to the preamble of the main claim.
  • DE-OS 25 08 390 it is already known in a fuel injector to design an axially movable valve needle as a thin, stiff rod or unstiff wire.
  • the rod is integrally connected at its downstream end to a closing head which interacts with a valve seat.
  • the rod passes through an anchor, being connected to a tension spring upstream of the anchor.
  • the tension spring ensures that when the solenoid coil is not excited, the closing head is pulled up to the valve seat via the rod, so that the valve is in the closed position. If current flows through the solenoid, the armature is attracted and the tension spring is stretched. As a result, the rod moves axially such that the closing head lifts off the valve seat. In order to close the valve again, the tensile forces of the tension spring act when the solenoid coil is not energized.
  • DE-OS 34 27 526 and DE-OS 35 35 438 fuel injectors are already known which can be actuated electromagnetically and have a flat armature in their magnetic circuit, DE-OS 34 27 526 also showing a light and elongated valve needle.
  • valve needle is advantageously designed as a thin wire which is connected to a sealing element, the sealing element in turn interacting with a valve seat.
  • valve needle and the sealing element are designed in such a way that the wire in the closed position of the valve, that is to say when the sealing element is in contact with the valve seat, transmits compressive forces to the sealing element and the valve seat.
  • the wire serving as a valve needle in one piece as a downstream, elongated continuation of a spiral return spring, by means of the compression spring force of which the sealing element passes over the
  • Valve needle is brought into the closed position of the valve.
  • the valve needle is advantageously provided with a support element that is very easy to manufacture.
  • a very high bending stiffness with the smallest possible additional mass is achieved by an L-shaped angle plate, which partially envelops the spring wire lying in the bend of the angle plate. Slipping of the angle plate on the wire is avoided by means of the connecting tabs connecting the two legs of the support element.
  • a non-positive connection is advantageously present between the wire and the sealing element.
  • the wire rounded at its downstream end engages in a recess in the sealing element and thus transmits the compressive forces of the return spring to the sealing element. It is particularly advantageous if the depression is shaped conically, the base of the depression ideally having the same radius as the rounded wire end.
  • an armature of the electromagnetic circuit is also advantageous to design as a flat armature, on which the return spring is supported. Due to its low overall height, a flat anchor construction is particularly suitable.
  • the formation of a flat anchor allows the use of a non-magnetic, e.g. austenitic material for a valve seat carrier, which can be deep-drawn much better than a ferritic material, which results in lower production costs.
  • the fuel injector according to the invention it is very easy to represent widely protruding injection points (e.g. already within an intake manifold) (extended tip injector), since the lengths of the deep-drawn valve seat carrier and the spring wire can be varied easily and inexpensively. It is of great advantage that the above-mentioned spray point is achieved with a very small moving mass due to the above-mentioned configuration of the valve needle.
  • Annular chambers 34 are formed between the two annular lugs 33 themselves and between the inner annular lug 33 and the core 2 and the outer annular lug 33 and the valve jacket 12.
  • a sealing ring 35 is inserted, which e.g. is designed as an O-ring. This measure ensures that the magnet coil 1 is dry.
  • the axial fixation of the sealing rings 35 takes place in that a holding ring 36, which has a T-shaped cross section, is arranged between the magnetic coil 1 and the armature 21, an axially extending arm engaging in the central annular chamber 34 between the two annular lugs 33.
  • the radially extending arms of the retaining ring 36 press against the sealing rings 35.
  • the anchor 21, designed as a flat anchor, is in the form of a thin, circular disk which is punched out, for example, from a larger sheet.
  • a central through opening 38 serves the fuel throughflow, which flows from the core 2 in the direction of the valve seat, and the passage of a spring wire 51 of the valve needle 18. Outside the central through opening 38, further holes 39 are provided in a circle in the armature 21, with which a reduction of so-called Splash losses due to the otherwise excessive flow resistance in the anchor area.
  • the passage opening 38 On the upstream side of the armature 21 the passage opening 38 has an embossed shoulder 40 on which the return spring 20 is supported.
  • the upstream end face of the armature 21 opposite these surfaces is surface-coated, for example hard chrome-plated or chemically nickel-plated, in order to guarantee adequate wear protection.
  • the valve seat support 16 is made with its inner longitudinal opening 17 such that the upper region 17a takes over the radial guidance of the armature 21.
  • An adjusting sleeve 43 inserted into a flow bore 42 of the core 2 concentric to the longitudinal axis 10 of the valve serves to adjust the spring preload of the return spring 20 resting on the adjusting sleeve 43, which is supported with its opposite side on the shoulder 40 of the armature 21.
  • the valve seat support 16 with the upper region 17a ensures the radial Guiding the plate spring 45. While the slightly curved outer ring 47 is supported on the lower end face of the armature 21 outside the holes 39, the Inner ring 48 of the plate spring 45 on a shoulder 49 of the valve seat carrier 16 which extends radially between the regions 17a and 17b.
  • the inner bending radius between the shoulder 49 and the lower area 17b facing the valve longitudinal axis 10 is suitable as the contact area.
  • the wire 51 serving as valve needle 18, in particular spring wire, provides the e.g. is a one-piece continuation of the return spring 20, which extends helically up to the shoulder 40 of the armature 21 and from there extends axially elongated in the downstream direction.
  • the valve needle 18 is rounded, for example, to fit into a middle, e.g. engage conical recess 50 of a sealing element 52.
  • the valve needle 18 transmits the spring force (compressive force) of the return spring 20 to the sealing element 52.
  • the disk-shaped sealing element 52 interacts with the valve seat body 23 and forms a seat valve.
  • valve needle 18 has an additional angled, in
  • the support element 53 is a sheet metal which is bent in a simple manner and which surrounds the spring wire 51 at approximately a right angle over most of the axial extension of the valve needle 18.
  • stabilization of the spring wire 51 is achieved, for example, by connecting tabs 54 being clamped in the kink of the support element 53 and connecting the two legs of the support element 53.
  • the spring wire 51 of the valve needle 18 can also be firmly connected to the support element 53 by welding, soldering or gluing. In a simple manner, a high bending stiffness of the valve needle 18 is achieved with a support element 53.
  • the disk-shaped sealing element 52 has on its lower end face 56, which faces the valve seat body 23, an outer, completely circumferential recess 57, in which an annular, resilient corrugated disk 58 is arranged.
  • the lower end face 56 of the sealing element 52 made, for example, of a stainless steel or ceramic, which serves as a sealing side interacting with the valve seat body 23, is very precisely machined, for example lapped, except in the region of the recess 57.
  • the radial guidance of the sealing element 52 during its axial movement along the longitudinal valve axis 10 takes place through the corrugated disk 58 in the region 17b of the valve seat support 16.
  • the corrugated disk 58 primarily has the task of lifting the sealing element 52 off the valve seat body 23 when the magnet coil 1 is excited.
  • the magnet coil 1 When the magnet coil 1 is not energized and the valve is closed, there is a frictional connection between the spring wire 51 and the sealing element 52 and the sealing element 52 and valve seat body 23 due to the pressure force effect of the return spring 20, since the spring force is transmitted to the sealing element 52 via the valve needle 18.
  • the solenoid coil 1 is now energized, the armature 21 is attracted against the spring force of the return spring 20, the valve needle 18 being forced to move axially. This movement of the valve needle 18 would result in the spring wire 51 lifting off the sealing element 52 and the sealing element 52 itself remaining on the valve seat body 23. Due to the spring washer 58 having a spring force against the spring force of the return spring 20, the sealing element 52 follows the movement of the valve needle 18, and that
  • the sealing element 52 and the valve seat body 23 are, for example, made of the same material, e.g. made of stainless steel or ceramic.
  • the valve seat support 16 has a bulge 60 with a larger inner diameter than in the region 17b, into which the valve seat body 23 is inserted with exact dimensions. In this case, the valve seat body 23 can still rest against an inclined surface 62 of the bulge 60 which serves as a stop.
  • small depressions are made in such a way that at least two raised areas are formed, on the one hand an outer support area 65 and on the other hand an inner sealing area 66.
  • the two areas 65 and 66 represent e.g.
  • the valve seat body 29 On its lower end facing away from the sealing element 52, the valve seat body 29 is provided with a spray-perforated disk 75, for example in the form of a pot.
  • the spray hole disk 75 nestles above all against the wall of the conical opening area 69, while it has a circumferential flat holding edge 76 radially outside the opening region 69.
  • a sealing ring 77 is arranged, for example, between the valve seat body 23, the bulge 60 of the valve seat support 16 and the spray hole disk 75 for sealing the seat area.
  • At least one, for example four, spray openings 78 formed by eroding or stamping are provided in a largely flat bottom region of the spray perforated disk 75 near the valve longitudinal axis 10.
  • the largely conical design within the opening area 69 is very advantageous for self-centering of the spray perforated disk 75.
  • the cone angle of the spray hole disk 75 is approximately 2 ° smaller than the cone angle of the opening region 69 of the valve seat body 23.
  • the spray hole disk 75 is fastened, for example, by a support disk 79 arranged downstream, which is designed in a circular shape and the holding edge 76 of the spray hole disk 75 between itself and the valve seat body 23 is jammed.
  • The, for example, deep-drawn valve seat support 16 consists of a non-magnetic austenitic material.
  • valve seat support 16 in the recessed section 12b is tightly and firmly connected to the valve jacket 12, for example by a weld seam formed by a laser.
  • the insertion depth of the valve seat body 23 determines the presetting of the stroke of the valve needle 18. Die precise stroke adjustment is carried out by plastic deformation of the radially extending shoulder 49 of the valve seat carrier 16 in the axial direction.
  • the one end position of the valve needle 18 when the magnet coil 1 is not energized is determined by the contact of the sealing element 52 on the valve seat body 23, while the other end position of the valve needle 18 when the magnet coil 1 is energized results from the contact of the armature 21 on the stop surface 25 of the core 2.
  • the injection valve is enclosed with plastic encapsulation 30, which encases the core 2 over a larger area and extends in the axial direction up to section 12a of the valve jacket 12, the valve jacket 12 being partially covered axially and in the circumferential direction.

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)

Abstract

L'invention concerne une soupape d'injection de carburant pour systèmes d'injection de carburant de moteurs à combustion interne, qui se caractérise par des composants individuels pouvant être fabriqués facilement et à faibles coûts. L'aiguille de soupape (18), qui peut se déplacer le long de l'axe longitudinal de soupape (10), est constituée principalement d'un fil métallique (51) mince qui constitue le prolongement aval de forme allongé d'un ressort de rappel (20) en spirale. L'aiguille de soupape (18) s'engage dans un élément d'échantéité (52) qui coopère avec un corps (23) présentant un siège de soupape fixe. L'aiguille de soupape (18) et l'élément d'étanchéité (52) sont disposés, par rapport au siège de soupape (23), de sorte que le fil métallique (51) transmette, lorsque la soupape est en position fermée, des forces de pression à l'élément d'étanchéité (52) et au siège de soupape (23). La soupape d'injection de carburant présentée se prête en particulier à une utilisation dans des systèmes d'injection de carburant de moteurs à combustion interne à compression du mélange et à allumage commandé.
EP98912280A 1997-06-06 1998-02-20 Soupape d'injection de carburant Withdrawn EP0917623A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19723953A DE19723953A1 (de) 1997-06-06 1997-06-06 Brennstoffeinspritzventil
DE19723953 1997-06-06
PCT/DE1998/000506 WO1998055763A1 (fr) 1997-06-06 1998-02-20 Soupape d'injection de carburant

Publications (1)

Publication Number Publication Date
EP0917623A1 true EP0917623A1 (fr) 1999-05-26

Family

ID=7831717

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98912280A Withdrawn EP0917623A1 (fr) 1997-06-06 1998-02-20 Soupape d'injection de carburant

Country Status (5)

Country Link
US (1) US6224002B1 (fr)
EP (1) EP0917623A1 (fr)
JP (1) JP2000516325A (fr)
DE (1) DE19723953A1 (fr)
WO (1) WO1998055763A1 (fr)

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Publication number Priority date Publication date Assignee Title
DE19932762A1 (de) * 1999-07-14 2001-01-18 Bosch Gmbh Robert Verfahren zur Einstellung des Ventilhubs eines Einspritzventils
DE10061572A1 (de) * 2000-12-11 2002-06-27 Bosch Gmbh Robert Brennstoffeinspritzventil
DE10131199A1 (de) * 2001-06-28 2003-01-16 Bosch Gmbh Robert Magnetventil zur Steuerung eines Einspritzventils einer Brennkraftmaschine
US20060249604A1 (en) * 2005-04-21 2006-11-09 Von Bacho Paul S Iii Fuel injector seat and director plate assembly
JP4491474B2 (ja) * 2007-05-31 2010-06-30 日立オートモティブシステムズ株式会社 燃料噴射弁及びそのストローク調整方法
DE102010029298A1 (de) * 2010-05-26 2011-12-01 Robert Bosch Gmbh Ventilanordnung zur Dosierung eines fluiden Mediums in einen Abgasstrang einer Brennkraftmaschine
JP6264966B2 (ja) * 2014-03-14 2018-01-24 株式会社デンソー 燃料噴射装置
DE102015226452A1 (de) * 2015-12-22 2017-06-22 Robert Bosch Gmbh Ventil zum Zumessen eines Fluids
DE102019104294A1 (de) * 2018-03-15 2019-09-19 Denso Corporation Korrosionsbeständige Vorrichtung

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US1879985A (en) * 1928-04-13 1932-09-27 Motorenfabrik Deutz Ag Cooled nozzle for fuel valves in internal combustion engines
GB334083A (en) * 1929-04-23 1930-08-28 Mansvet Kasik Improved fuel injection valve for internal combustion engines
US2756107A (en) * 1952-05-16 1956-07-24 Eugene J Korda Fuel injection valve
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US3542293A (en) * 1968-08-01 1970-11-24 Ford Motor Co Fuel injector
DE2508390A1 (de) * 1975-02-26 1976-09-09 Bosch Gmbh Robert Einspritz-magnetventil
US4057190A (en) 1976-06-17 1977-11-08 Bendix Corporation Fuel break-up disc for injection valve
DE2900176A1 (de) * 1979-01-04 1980-07-24 Bosch Gmbh Robert Einspritzventil fuer kraftstoffeinspritzanlagen
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DE3427526A1 (de) 1984-07-26 1986-02-06 Robert Bosch Gmbh, 7000 Stuttgart Elektromagnetisch betaetigbares ventil
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ITBO940223A1 (it) * 1994-05-18 1995-11-18 Weber Srl Iniettore ad alta capacita' di atomizzazione
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See references of WO9855763A1 *

Also Published As

Publication number Publication date
US6224002B1 (en) 2001-05-01
WO1998055763A1 (fr) 1998-12-10
DE19723953A1 (de) 1998-12-10
JP2000516325A (ja) 2000-12-05

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