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EP0383085B1 - Orifice plate for a fuel injection valve - Google Patents

Orifice plate for a fuel injection valve Download PDF

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Publication number
EP0383085B1
EP0383085B1 EP90101708A EP90101708A EP0383085B1 EP 0383085 B1 EP0383085 B1 EP 0383085B1 EP 90101708 A EP90101708 A EP 90101708A EP 90101708 A EP90101708 A EP 90101708A EP 0383085 B1 EP0383085 B1 EP 0383085B1
Authority
EP
European Patent Office
Prior art keywords
orifice plate
orifice
cylindrical
fuel injection
injection valve
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
EP90101708A
Other languages
German (de)
French (fr)
Other versions
EP0383085A1 (en
Inventor
Martin Dipl.-Ing. Maier
Jürgen Buchholz
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
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0383085A1 publication Critical patent/EP0383085A1/en
Application granted granted Critical
Publication of EP0383085B1 publication Critical patent/EP0383085B1/en
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
    • 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
    • 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
    • F02M51/08—Injectors peculiar thereto with means directly operating the valve needle specially for low-pressure fuel-injection

Definitions

  • the invention relates to a perforated plate according to the preamble of claim 1.
  • a perforated plate shows e.g. document DE-A-3640830
  • a plate with bores is arranged downstream of the valve seat surface, through which the atomization of the fuel then takes place. Most of the time these plates contain several holes. It is also known to provide these bores at an angle to the valve axis or to provide an annular groove in a surface of the plate, from which the individual bores then extend. However, line blasting with relatively poor atomization is caused by the individual bores.
  • the object of the present invention is to generate flat jets or fan jets for atomizing the fuel, so as to obtain better atomization.
  • the measures according to the characterizing part of claim 1 are proposed to achieve this object.
  • the jet shape such as jet angle and jet distribution, can be influenced in a simple manner by varying the inlet geometry, for example the inlet depth of the inlet angle, etc.
  • single-jet valves with full cone distribution as well as two- and three-jet valves can be produced, which have a better preparation than the previous valves.
  • There is a simple design option for the jet shape and the invention can be applied directly to series injection valves.
  • FIG. 1 represents the lowermost part of an injection valve
  • FIG. 2 shows a plan view of a perforated plate designed according to the invention in viewing direction A of FIG. 3 and FIG show in Fig.2.
  • a fuel injection valve for a fuel injection system of a mixture-compressing, spark-ignited internal combustion engine.
  • a fuel injection valve is also described and illustrated, for example, in DE-OS 3 640 830 and reference is expressly made here to this publication.
  • a holding sleeve 2 is screwed onto a nozzle body 1, the nozzle body 1 having a sealing seat surface 6 which, together with a cone 5 of a valve needle 4, forms the actual valve.
  • a collecting bore 7 is formed in the nozzle body 1 and ends at an end face 17 of the nozzle body 1.
  • a thin perforated plate 3 is clamped perpendicular to the valve axis and has at least one hole 9. The fuel jet or jets then emerge via this hole or these holes 9 and thereby penetrate a bore 8 in the holding sleeve 2.
  • the invention is now shown in more detail, and these figures show a perforated plate 3 with a single hole 9.
  • the perforated plate 3 may have several such holes.
  • an elongated indentation 10 is formed open to the collecting bore 7 in the perforated plate 3, each of which opens into the cylindrical hole 9 opposite one another, namely the edge 13 of each indentation 10 running in the flow direction is approximately on both sides connected to the edge 14 of the cylindrical hole 9 and, as can be seen, the width of the indentation 10 corresponds approximately to the corresponding diameter of the cylindrical hole 9.
  • the indentations 10 preferably extend inclined from the surface of the perforated plate 3 to the hole 9, as shown in FIG. 3 shows.
  • the holes 9 are preferably circular cylindrical.
  • current threads 11 are shown in FIGS. 2 and 3. It can be seen that in the two opposing impressions 10, the current threads 11 are directed against the central axis of the hole, meet there and the flow direction is then deflected by 90 °, so that a flat jet 12 shown in broken lines is formed and emerges from the hole 9, which is aligned perpendicular to the longitudinal axis of the impressions 10. Since here a flatter liquid lamella emerges at the exit from the hole than with line jets, the atomization of the supplied fuel is significantly increased. As already mentioned, by changing the inlet geometry, i.e. the depth of the impressions, the beam shape, ie the beam angle and the beam distribution and the like, can be influenced in a simple manner. By combining several flat jets 12, single jet valves with full cone distribution as well as two and three jet valves can be produced.

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  • 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)

Description

Stand der TechnikState of the art

Die Erfindung betrifft eine Lochplatte nach der Gattung des Anspruches 1. Eine derartige Lochplatte zeigt z.B. das Dokument DE-A-3640830 Es ist bekannt, daß man bei Kraftstoffeinspritzventilen stromabwärts der Ventilsitzfläche ein Plättchen mit Bohrungen anordnet, durch das dann die Zerstäubung des Kraftstoffes erfolgt. Meistens enthalten diese Plättchen mehrere Bohrungen. Es ist auch schon bekannt, diese Bohrungen unter einem Winkel zur Ventilachse vorzusehen bzw. in einer Fläche des Plättchens eine ringförmige Nut vorzusehen, von der aus sich dann die einzelnen Bohrungen erstrecken. Durch die einzelnen Bohrungen werden jedoch Schnurstrahlen mit einer relativ schlechten Zerstäubung hervorgerufen.The invention relates to a perforated plate according to the preamble of claim 1. Such a perforated plate shows e.g. document DE-A-3640830 It is known that in fuel injectors a plate with bores is arranged downstream of the valve seat surface, through which the atomization of the fuel then takes place. Most of the time these plates contain several holes. It is also known to provide these bores at an angle to the valve axis or to provide an annular groove in a surface of the plate, from which the individual bores then extend. However, line blasting with relatively poor atomization is caused by the individual bores.

Aufgabe der ErfindungObject of the invention

Die vorliegende Erfindung hat die Aufgabe, zur Zerstäubung des Kraftstoffes Flachstrahlen oder Fächerstrahlen zu erzeugen, um so eine bessere Zerstäubung zu erhalten.The object of the present invention is to generate flat jets or fan jets for atomizing the fuel, so as to obtain better atomization.

Erfindungsgemäß werden zur Lösung dieser Aufgabe die Maßnahmen gemäß dem Kennzeichen des Anspruches 1 vorgeschlagen. Durch die Form der Einlaufprägung in der Lochplatte werden zwei Strömungshälften gebildet und die beiden Strömungshälften werden unmittelbar vor dem zylindrischen Loch gegeneinander gelenkt, wodurch sich trotz des anschließenden zylindrischen Querschnittes des Loches ein Flachstrahl erzeugen läßt. Durch die Variation der Einlaufgeometrie, z.B. der Einlauftiefe des Einlaufwinkels usw., kann in einfacher Weise die Strahlform, wie Strahlwinkel und Strahlverteilung, beeinflußt werden. Durch Kombination von mehreren Flachstrahlen in einer Lochplatte können Einstrahlventile mit Vollkegelverteilung sowie Zwei- und Dreistrahlventile hergestellt werden, welche eine bessere Aufbereitung als die bisherigen Ventile besitzen. Es ist eine einfache Gestaltungsmöglichkeit der Strahlform gegeben und die Erfindung läßt sich direkt auf Serieneinspritzventile anwenden.According to the invention, the measures according to the characterizing part of claim 1 are proposed to achieve this object. Due to the shape of the inlet stamping in the perforated plate, two flow halves are formed and the two flow halves are immediately in front the cylindrical hole directed against each other, whereby a flat jet can be generated despite the subsequent cylindrical cross section of the hole. The jet shape, such as jet angle and jet distribution, can be influenced in a simple manner by varying the inlet geometry, for example the inlet depth of the inlet angle, etc. By combining several flat jets in a perforated plate, single-jet valves with full cone distribution as well as two- and three-jet valves can be produced, which have a better preparation than the previous valves. There is a simple design option for the jet shape and the invention can be applied directly to series injection valves.

Zeichnungendrawings

Die Erfindung wird nun anhand der Zeichnungen beispielsweise dargestellt, wobei Fig.1 den untersten Teil eines Einspritzventiles darstellt, Fig.2 eine Draufsicht auf eine erfindungsgemäß ausgebildete Lochplatte in Blickrichtung A der Fig.3 und Fig.3 einen Schnitt entlang der Linie III-III in Fig.2 zeigen.The invention will now be illustrated, for example, with reference to the drawings, in which FIG. 1 represents the lowermost part of an injection valve, FIG. 2 shows a plan view of a perforated plate designed according to the invention in viewing direction A of FIG. 3 and FIG show in Fig.2.

Beschreibung eines AusführungsbeispielesDescription of an embodiment

In Fig.1 ist beispielsweise das untere Ende eines Kraftstoffeinspritzventiles für eine Kraftstoffeinspritzanlage einer gemischverdichtenden, fremdgezündeten Brennkraftmaschine gezeigt. Ein derartiges Kraftstoffeinspritzventil ist z.B. auch in der DE-OS 3 640 830 beschrieben und dargestellt und es wird hier ausdrücklich auf diese Veröffentlichung Bezug genommen. Wie man der Fig.1 entnehmen kann, ist auf einen Düsenkörper 1 eine Haltehülse 2 aufgeschraubt, wobei der Düsenkörper 1 eine Dichtsitzfläche 6 besitzt, die zusammen mit einem Kegel 5 einer Ventilnadel 4 das eigentliche Ventil bildet. Stromabwärts der Dichtsitzfläche 6 ist im Düsenkörper 1 eine Sammelbohrung 7 ausgebildet, die an einer Stirnfläche 17 des Düsenkörpers 1 endet. Zwischen der Stirnfläche 17 des Düsenkörpers 1 und der Haltehülse 2 ist senkrecht zur Ventilachse eine dünne Lochplatte 3 eingeklemmt, die mindestens ein Loch 9 besitzt. Über dieses Loch oder diese Löcher 9 treten dann der oder die Kraftstoffstrahlen aus und durchdringen dabei eine Bohrung 8 in der Haltehülse 2.1 shows, for example, the lower end of a fuel injection valve for a fuel injection system of a mixture-compressing, spark-ignited internal combustion engine. Such a fuel injection valve is also described and illustrated, for example, in DE-OS 3 640 830 and reference is expressly made here to this publication. 1, a holding sleeve 2 is screwed onto a nozzle body 1, the nozzle body 1 having a sealing seat surface 6 which, together with a cone 5 of a valve needle 4, forms the actual valve. Is downstream of the sealing seat 6 A collecting bore 7 is formed in the nozzle body 1 and ends at an end face 17 of the nozzle body 1. Between the end face 17 of the nozzle body 1 and the holding sleeve 2, a thin perforated plate 3 is clamped perpendicular to the valve axis and has at least one hole 9. The fuel jet or jets then emerge via this hole or these holes 9 and thereby penetrate a bore 8 in the holding sleeve 2.

In den Fig. 2 und 3 ist nunmehr die Erfindung näher dargestellt, und zwar zeigen diese Figuren eine Lochplatte 3 mit einem einzigen Loch 9. Es ist aber selbstverständlich, daß die Lochplatte 3 mehrere derartige Löcher haben kann. Auf seiner dem Düsenkörper 1 zugewandten Seite ist offen zur Sammelbohrung 7 hin in der Lochplatte 3 je eine längliche Einprägung 10 ausgebildet, die je in das zylindrische Loch 9 einander gegenüberliegend mündet, und zwar ist der in Strömungsrichtung verlaufende Rand 13 jeder Einprägung 10 beiderseits etwa mit dem Rand 14 des zylindrischen Loches 9 verbunden und, wie man sieht, entspricht die Breite der Einprägung 10 etwa dem entsprechenden Durchmesser des zylindrischen Loches 9. Die Einprägungen 10 verlaufen von der Oberfläche der Lochplatte 3 zum Loch 9 vorzugsweise geneigt, wie es die Fig.3 zeigt. Die Löcher 9 sind vorzugsweise kreiszylinderförmig.2 and 3, the invention is now shown in more detail, and these figures show a perforated plate 3 with a single hole 9. However, it is understood that the perforated plate 3 may have several such holes. On its side facing the nozzle body 1, an elongated indentation 10 is formed open to the collecting bore 7 in the perforated plate 3, each of which opens into the cylindrical hole 9 opposite one another, namely the edge 13 of each indentation 10 running in the flow direction is approximately on both sides connected to the edge 14 of the cylindrical hole 9 and, as can be seen, the width of the indentation 10 corresponds approximately to the corresponding diameter of the cylindrical hole 9. The indentations 10 preferably extend inclined from the surface of the perforated plate 3 to the hole 9, as shown in FIG. 3 shows. The holes 9 are preferably circular cylindrical.

Zum besseren Verständnis sind in den Fig. 2 und 3 Stromfäden 11 eingezeichnet. Man sieht, daß in den beiden einander gegenüberliegenden Einprägungen 10 die Stromfäden 11 gegen die Mittelachse des Loches gelenkt werden, dort aufeinandertreffen und die Strömungsrichtung dann um 90° umgelenkt wird, so daß ein gestrichelt dargestellter Flachstrahl 12 entsteht und aus dem Loch 9 austritt, der senkrecht zur Längsachse der Einprägungen 10 ausgerichtet ist. Da hier eine flachere Flüssigkeitslamelle beim Austritt aus dem Loch als bei Schnurstrahlen entsteht, wird die Zerstäubung des zugeführten Kraftstoffes wesentlich erhöht. Wie bereits erwähnt, kann durch Änderung der Einlaufgeometrie, also der Tiefe der Einprägungen, in einfacher Weise die Strahlform, d.h. der Strahlwinkel und die Strahlverteilung und dgl., beeinflußt werden. Durch Kombination mehrerer Flachstrahlen 12 können Einstrahlventile mit Vollkegelverteilung sowie Zwei- und Dreistrahlventile hergestellt werden.For better understanding, current threads 11 are shown in FIGS. 2 and 3. It can be seen that in the two opposing impressions 10, the current threads 11 are directed against the central axis of the hole, meet there and the flow direction is then deflected by 90 °, so that a flat jet 12 shown in broken lines is formed and emerges from the hole 9, which is aligned perpendicular to the longitudinal axis of the impressions 10. Since here a flatter liquid lamella emerges at the exit from the hole than with line jets, the atomization of the supplied fuel is significantly increased. As already mentioned, by changing the inlet geometry, i.e. the depth of the impressions, the beam shape, ie the beam angle and the beam distribution and the like, can be influenced in a simple manner. By combining several flat jets 12, single jet valves with full cone distribution as well as two and three jet valves can be produced.

Claims (4)

  1. Orifice plate (3) of a fuel injection valve for fuel injection systems of internal combustion engines, which orifice plate (3) is located downstream of a valve seat surface (6) provided in a nozzle body (1) and interacting with a valve closing body (4), characterised in that the orifice plate (3) has at least one cylindrical orifice (9) and a pair of mutually opposite longitudinal impressions (10) open into the cylindrical orifice (9) for the introduction of fuel, the longitudinal impressions (10) being formed on a surface of the orifice plate (3) which faces towards the nozzle body (1) and extending at an inclination from the surface of the orifice plate (3) to the cylindrical orifice (9).
  2. Orifice plate according to Claim 1, characterised in that the orifices (9) are circular-cylindrical.
  3. Orifice plate according to Claim 1 or 2, characterised in that the impressions (10) have a width which correspond (sic) approximately to the corresponding diameter of the cylindrical orifice (9).
  4. Orifice plate according to one of the preceding claims, characterised in that the edges (13) of each impression (10) are connected to, for instance, the periphery (14) of the associated orifice (9).
EP90101708A 1989-02-15 1990-01-29 Orifice plate for a fuel injection valve Expired - Lifetime EP0383085B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3904446A DE3904446A1 (en) 1989-02-15 1989-02-15 PERFORATED PLATE FOR A FUEL INJECTION VALVE
DE3904446 1989-02-15

Publications (2)

Publication Number Publication Date
EP0383085A1 EP0383085A1 (en) 1990-08-22
EP0383085B1 true EP0383085B1 (en) 1993-05-26

Family

ID=6374076

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90101708A Expired - Lifetime EP0383085B1 (en) 1989-02-15 1990-01-29 Orifice plate for a fuel injection valve

Country Status (7)

Country Link
US (1) US5012983A (en)
EP (1) EP0383085B1 (en)
JP (1) JP3011731B2 (en)
AU (1) AU614687B2 (en)
BR (1) BR9000666A (en)
DE (2) DE3904446A1 (en)
ES (1) ES2041052T3 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4104019C1 (en) * 1991-02-09 1992-04-23 Robert Bosch Gmbh, 7000 Stuttgart, De
IT1250845B (en) * 1991-10-11 1995-04-21 Weber Srl ELECTROMAGNETICALLY OPERATED FUEL DOSING AND PULVERIZING VALVE FOR AN ENDOTHERMAL MOTOR FEEDING DEVICE
US5492277A (en) * 1993-02-17 1996-02-20 Nippondenso Co., Ltd. Fluid injection nozzle
DE4307159B4 (en) * 1993-03-06 2009-03-26 Robert Bosch Gmbh Spray orifice plate for a valve and method of manufacture
US5765750A (en) * 1996-07-26 1998-06-16 Siemens Automotive Corporation Method and apparatus for controlled atomization in a fuel injector for an internal combustion engine
US6572028B1 (en) 2000-01-19 2003-06-03 Visteon Global Technologies, Inc. Combined needle guide, filter, and flow director for gasoline fuel injectors
US20060226264A1 (en) * 2005-04-08 2006-10-12 Bacho Paul S V Iii Fuel injector director plate having chamfered passages and method for making such a plate
JP2014073105A (en) * 2012-10-04 2014-04-24 Maeda Kosen Co Ltd Vegetation mat

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1589245A (en) * 1919-07-03 1926-06-15 Super Diesel Tractor Corp Injection valve
US1589238A (en) * 1919-07-03 1926-06-15 Super Diesel Tractor Corp Injection valve
US2308504A (en) * 1940-02-03 1943-01-19 Louis O French Spray nozzle
US4646974A (en) * 1985-05-06 1987-03-03 General Motors Corporation Electromagnetic fuel injector with orifice director plate
US4699323A (en) * 1986-04-24 1987-10-13 General Motors Corporation Dual spray cone electromagnetic fuel injector
DE3640830C2 (en) * 1986-11-28 1996-02-22 Bosch Gmbh Robert Fuel injector
DE8632002U1 (en) * 1986-11-28 1988-03-31 Robert Bosch Gmbh, 7000 Stuttgart Fuel injection valve

Also Published As

Publication number Publication date
JP3011731B2 (en) 2000-02-21
BR9000666A (en) 1991-01-15
DE59001520D1 (en) 1993-07-01
JPH02241975A (en) 1990-09-26
US5012983A (en) 1991-05-07
ES2041052T3 (en) 1993-11-01
EP0383085A1 (en) 1990-08-22
DE3904446A1 (en) 1990-08-16
AU4895690A (en) 1990-08-23
AU614687B2 (en) 1991-09-05

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