EP0675283A1 - Injection valve - Google Patents
Injection valve Download PDFInfo
- Publication number
- EP0675283A1 EP0675283A1 EP95103810A EP95103810A EP0675283A1 EP 0675283 A1 EP0675283 A1 EP 0675283A1 EP 95103810 A EP95103810 A EP 95103810A EP 95103810 A EP95103810 A EP 95103810A EP 0675283 A1 EP0675283 A1 EP 0675283A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- injection valve
- perforated
- perforated disk
- punching
- 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.)
- Granted
Links
Images
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
- 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
- F02M51/0682—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 the body being hollow and its interior communicating with the fuel flow
-
- 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
- F02M61/166—Selection of particular materials
-
- 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
-
- 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
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49428—Gas and water specific plumbing component making
- Y10T29/49432—Nozzle making
Definitions
- the invention is based on an injection valve according to the preamble of the main claim.
- an injection valve is already known which has a perforated disk downstream of its valve seat surface.
- the perforated disc has several spray holes through which a medium such as fuel can escape.
- the spray holes are made by eroding in the perforated disc.
- perforated disks on injection valves that have injection holes made by punching.
- the cup-shaped perforated disks represent a thin sheet and, depending on the material, have a tensile strength of 400 to 600 N / mm2.
- the punching of the spray holes in the perforated disk has the result that a punching indentation is formed on a first surface on which the punch hits the perforated disk, while on a second surface on which the punch emerges from the perforated disk again on A raised area in the form of a ridge arises.
- This disadvantageous ridge cannot be kept constant in many punching processes, so that it is relatively large Flow and beam angle scatter can occur. In large series production, however, these variations should be kept as low as possible. Grinding the punch burrs would represent an additional process that further increases manufacturing costs.
- the injection valve according to the invention with the characterizing features of the main claim has the advantage that little effort and cost-effectively produced perforated disks with punched spray holes do not have any disadvantageous burr and, above all, the scattering of the jet angle or the flow rate is significantly reduced. A complex deburring is therefore inevitable. In large series production, the quality of the spray holes can be kept largely constant, so that the scattering of the medium flowing through is less.
- FIG. 1 shows a partially illustrated injection valve
- FIG. 2 shows a perforated disk
- FIG. 3 shows a partially illustrated perforated disk of low hardness with a spray hole according to the prior art
- FIG. 4 shows a perforated disk of greater hardness with a spray hole
- FIG. 5 shows a perforated disk of greater hardness with a spray hole , which is punched in the opposite direction of flow.
- the injection valve has a tubular valve seat support 1, in which a longitudinal opening 3 is formed concentrically with a valve longitudinal axis 2.
- a longitudinal opening 3 is formed concentrically with a valve longitudinal axis 2.
- the injection valve is actuated in a known manner, for example electromagnetically.
- An indicated electromagnetic circuit with a magnet coil 10, an armature 11 and a core 12 serves for the axial movement of the valve needle 5 and thus for opening against the spring force of a return spring (not shown) or closing the injection valve.
- the armature 11 is facing away from the valve closing body 7 End of the valve needle 5 by z.
- a guide opening 15 of a valve seat body 16 is used to guide the valve closing body 7 during the axial movement.
- the cylindrical valve seat body 16 is tightly mounted in the longitudinal opening 3 which is concentric to the longitudinal axis 2 of the valve by welding.
- the valve seat body 16 On its one lower end face 17 facing away from the valve closing body 7 the valve seat body 16 with a bottom part 20 of a z.
- B. pot-shaped perforated disc 21 concentrically and firmly connected so that the bottom part 20 abuts with its upper end face 44 on the lower end face 17 of the valve seat body 16.
- valve seat body 16 and the perforated disk 21 are connected, for example, by a circumferential and sealed first weld seam 22 which is formed by a laser.
- This type of assembly increases the risk of undesired deformation of the base part 20 in its central region 24, in which at least one, For example, four injection holes 25 formed by stamping are avoided.
- a peripheral holding edge 26 adjoins the base part 20 of the pot-shaped perforated disk 21, for example.
- the holding edge 26 exerts a radial spring action on the wall of the longitudinal opening 3. This prevents chip formation on the valve seat part and on the longitudinal opening 3 when the valve seat part consisting of valve seat body 16 and perforated disk 21 is inserted into the longitudinal opening 3 of the valve seat carrier 1.
- the holding edge 26 of the perforated disk 21 is connected to the wall of the longitudinal opening 3, for example by a circumferential and tight second weld seam 30.
- the insertion depth of the valve seat part consisting of valve seat body 16 and cup-shaped perforated disk 21 into the longitudinal opening 3 determines the presetting of the stroke of the valve needle 5, since the one end position of the valve needle 5 when the solenoid coil 10 is not energized due to the valve closing body 7 resting on a valve seat surface 29 of the valve seat body 16 is set.
- the other end position the valve needle 5 is fixed when the magnet coil 10 is excited, for example by the armature 11 resting on the core 12.
- the path between these two end positions of the valve needle 5 thus represents the stroke.
- the spherical valve closing body 7 interacts with the valve seat surface 29 of the valve seat body 16 which tapers in the shape of a truncated cone, which is formed in the axial direction between the guide opening 15 and the lower end face 17 of the valve seat body 16.
- a protective cap 40 is arranged on the periphery of the valve seat support 1 at its downstream end facing away from the solenoid 10 and is connected to the valve seat support 1 by means of, for example, a snap-in connection.
- a sealing ring 41 serves to seal between the circumference of the injection valve and a valve receptacle, not shown, for example the intake line of the internal combustion engine.
- FIG. 2 shows the perforated disk 21 with its spray holes 25 arranged in the central region 24.
- B symmetrically around the longitudinal valve axis 2 in the form of corner points of a square and thus each have the same distance from each other and to the longitudinal valve axis 2.
- the bottom part 20 of the perforated disc 21 has the upper end face 44, which corresponds to a second flat surface, and an opposite lower Face 19, which corresponds to a first flat surface.
- the injection holes 25 are introduced in the opposite direction on the injection valve according to the invention.
- the punching direction is indicated by an arrow 45.
- the punches of the punching tool thus first meet the first surface 19 of the bottom part 20 of the perforated disk 21, which in the later installation position of the perforated disk 21 on the injection valve is downstream of the second surface 44, and penetrate the material of the perforated disk 21 to the second surface 44, where they leak out of the material.
- the punching direction is therefore opposite to the medium flow direction ( Figure 2).
- FIG. 3 shows a spray hole 25 in a perforated disk 21, as is the case with punching which has been customary to date.
- the known perforated disks have a tensile strength of 400 to 600 N / mm2 depending on the material.
- the relatively low hardness resulting from these values is the reason why a punching indentation 50, i.e. an enlargement of the cross-section of the injection hole 25, occurs on the first surface 19 due to the entry of the punch, while a ridge 51 on the second surface 44 extends over the Surface 44 protrudes, arises.
- the consequences of these phenomena at the spray hole 25, which are not shown to scale, are comparatively large flow and jet angle scatterings.
- FIG. 4 shows a spray hole 25 in the perforated disk 21, which is made of a material of greater hardness than the material of the perforated disk 21 according to FIG. 3.
- the perforated disk 21 now has a tensile strength of> 800 N / mm2, which corresponds approximately to a Vickers hardness of> 300 HV1.
- the usual perforated disks 21 can be brought to a greater material hardness, for example, by work hardening.
- the greater material hardness means that there is little or no negligible punching or burring. Due to the greater brittleness of the material, there is no burr formation, but there is a punch breakout 52 at the injection hole 25, and the material breaks out on the exit surface of the punch, that is to say on the second surface 44.
- This punch cutout 52 slightly enlarges the cross section of the spray hole 25 only in the vicinity of the second surface 44. The scatter of the flow rates can be reduced as a result; the beam angle scattering is retained by the punch cutout 52 on the downstream second
- FIG. 5 shows a perforated disk 21 with a spray hole 25, which was punched in the opposite direction to the later medium flow direction, namely from the first surface 19 to the second surface 44, as indicated by the arrow 45 for the punching direction.
- the material properties are the same as for the perforated disc 21 shown in FIG. 4, the tensile strength of the material is therefore also> 800 N / mm2.
- the punch cutout 52 created by the punching lies on the second surface 44 of the perforated disk 21, but in the installed state in the injection valve faces the valve closing body 7.
- the transition from the spraying hole 25 to the first surface 19 is therefore relatively sharp-edged and therefore has almost no deformations which cause negative effects when spraying.
- the beam angle scatter advantageously remains very low due to this arrangement.
- the variation in the flow rate can be reduced even further by varying the punch diameter of the punching tool.
- the configuration of the perforated disk 21 according to the invention is possible with any shape of the perforated disk, that is to say also with perforated disks which do not have a holding edge 26.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fuel-Injection Apparatus (AREA)
- Powder Metallurgy (AREA)
Abstract
Description
Die Erfindung geht aus von einem Einspritzventil nach der Gattung des Hauptanspruchs. Aus der DE-OS 40 26 721 ist bereits ein Einspritzventil bekannt, das stromabwärts seiner Ventilsitzfläche eine Lochscheibe aufweist. Die Lochscheibe weist mehrere Abspritzlöcher auf, durch die ein Medium wie Brennstoff austreten kann. Die Abspritzlöcher sind durch Erodieren in der Lochscheibe eingebracht.The invention is based on an injection valve according to the preamble of the main claim. From DE-OS 40 26 721 an injection valve is already known which has a perforated disk downstream of its valve seat surface. The perforated disc has several spray holes through which a medium such as fuel can escape. The spray holes are made by eroding in the perforated disc.
Außerdem ist bereits bekannt, Lochscheiben an Einspritzventilen zu verwenden, die mittels Stanzen eingebrachte Abspritzlöcher aufweisen. Die beispielsweise topfförmig ausgebildeten Lochscheiben stellen ein dünnes Blech dar und besitzen je nach Werkstoff eine Zugfestigkeit von 400 bis 600 N/mm². Das Stanzen der Abspritzlöcher in die Lochscheibe hat zur Folge, daß sich an einer ersten Fläche, an der der Stanzstempel auf die Lochscheibe auftrifft, am Lochrand ein Stanzeinzug bildet, während an einer zweiten Fläche, an der der Stanzstempel aus der Lochscheibe wieder austritt, am Lochrand eine Erhebung in Form eines Grates entsteht. Dieser nachteilige Grat läßt sich unmöglich bei vielen Stanzvorgängen konstant halten, so daß relativ große Durchfluß- und Strahlwinkelstreuungen auftreten können. In der Großserienproduktion sollen jedoch diese Streuungen möglichst gering gehalten werden. Ein Abschleifen der Stanzgrate wurde ein zusätzliches Verfahren darstellen, das die Herstellungskosten weiter in die Höhe treibt.In addition, it is already known to use perforated disks on injection valves that have injection holes made by punching. The cup-shaped perforated disks, for example, represent a thin sheet and, depending on the material, have a tensile strength of 400 to 600 N / mm². The punching of the spray holes in the perforated disk has the result that a punching indentation is formed on a first surface on which the punch hits the perforated disk, while on a second surface on which the punch emerges from the perforated disk again on A raised area in the form of a ridge arises. This disadvantageous ridge cannot be kept constant in many punching processes, so that it is relatively large Flow and beam angle scatter can occur. In large series production, however, these variations should be kept as low as possible. Grinding the punch burrs would represent an additional process that further increases manufacturing costs.
Das erfindungsgemäße Einspritzventil mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß mit geringem Aufwand und kostengünstig hergestellte Lochscheiben mit gestanzten Abspritzlöchern keinen nachteiligen Grat aufweisen und damit vor allen Dingen die Streuung der Strahlwinkel bzw. der Durchflußmenge deutlich herabgesetzt ist. Ein aufwendiges Entgraten entfällt deshalb zwangsläufig. Bei der Großserienproduktion kann die Qualität der Abspritzlöcher weitgehend konstant gehalten werden, so daß die Streuungen des durchströmenden Mediums geringer sind.The injection valve according to the invention with the characterizing features of the main claim has the advantage that little effort and cost-effectively produced perforated disks with punched spray holes do not have any disadvantageous burr and, above all, the scattering of the jet angle or the flow rate is significantly reduced. A complex deburring is therefore inevitable. In large series production, the quality of the spray holes can be kept largely constant, so that the scattering of the medium flowing through is less.
Ausführungsbeispiele der Erfindung sind in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 ein teilweise dargestelltes Einspritzventil, Figur 2 eine Lochscheibe, Figur 3 eine teilweise dargestellte Lochscheibe geringer Härte mit einem Abspritzloch nach dem Stand der Technik, Figur 4 eine Lochscheibe größerer Härte mit einem Abspritzloch und Figur 5 eine Lochscheibe größerer Härte mit einem Abspritzloch, das entgegengesetzt der späteren Strömungsrichtung gestanzt ist.Embodiments of the invention are shown in simplified form in the drawing and explained in more detail in the following description. FIG. 1 shows a partially illustrated injection valve, FIG. 2 shows a perforated disk, FIG. 3 shows a partially illustrated perforated disk of low hardness with a spray hole according to the prior art, FIG. 4 shows a perforated disk of greater hardness with a spray hole and FIG. 5 shows a perforated disk of greater hardness with a spray hole , which is punched in the opposite direction of flow.
In der Figur 1 ist als ein Ausführungsbeispiel ein Ventil in der Form eines Einspritzventils für Brennstoffeinspritzanlagen von gemischverdichtenden fremdgezündeten Brennkraftmaschinen teilweise dargestellt. Das Einspritzventil hat einen rohrförmigen Ventilsitzträger 1, in dem konzentrisch zu einer Ventillängsachse 2 eine Längsöffnung 3 ausgebildet ist. In der Längsöffnung 3 ist eine z. B. rohrförmige Ventilnadel 5 angeordnet, die an ihrem stromabwärtigen Ende 6 mit einem z. B. kugelförmigen Ventilschließkörper 7, an dessen Umfang beispielsweise fünf Abflachungen 8 vorgesehen sind, verbunden ist.1 shows, as an exemplary embodiment, a valve in the form of an injection valve for fuel injection systems of mixed-compression spark-ignition internal combustion engines. The injection valve has a tubular valve seat support 1, in which a
Die Betätigung des Einspritzventils erfolgt in bekannter Weise, beispielsweise elektromagnetisch. Zur axialen Bewegung der Ventilnadel 5 und damit zum Öffnen entgegen der Federkraft einer nicht dargestellten Rückstellfeder bzw. Schließen des Einspritzventils dient ein angedeuteter elektromagnetischer Kreis mit einer Magnetspule 10, einem Anker 11 und einem Kern 12. Der Anker 11 ist mit dem dem Ventilschließkörper 7 abgewandten Ende der Ventilnadel 5 durch z. B. eine Schweißnaht mittels eines Lasers verbunden und auf den Kern 12 ausgerichtet.The injection valve is actuated in a known manner, for example electromagnetically. An indicated electromagnetic circuit with a
Zur Führung des Ventilschließkörpers 7 während der Axialbewegung dient eine Führungsöffnung 15 eines Ventilsitzkörpers 16. In das stromabwärts liegende, dem Kern 11 abgewandte Ende des Ventilsitzträgers 1 ist in der konzentrisch zur Ventillängsachse 2 verlaufenden Längsöffnung 3 der zylinderförmige Ventilsitzkörper 16 durch Schweißen dicht montiert. An seiner einen, dem Ventilschließkörper 7 abgewandten, unteren Stirnseite 17 ist der Ventilsitzkörper 16 mit einem Bodenteil 20 einer z. B. topfförmig ausgebildeten Lochscheibe 21 konzentrisch und fest verbunden, so daß das Bodenteil 20 mit seiner oberen Stirnseite 44 an der unteren Stirnseite 17 des Ventilsitzkörpers 16 anliegt.A guide opening 15 of a
Die Verbindung von Ventilsitzkörper 16 und Lochscheibe 21 erfolgt beispielsweise durch eine umlaufende und dichte, mittels eines Lasers ausgebildete erste Schweißnaht 22. Durch diese Art der Montage ist die Gefahr einer unerwünschten Verformung des Bodenteils 20 in seinem zentralen Bereich 24, in dem sich wenigstens eine, beispielsweise vier durch Stanzen ausgeformte Abspritzlöcher 25 befinden, vermieden.The
An das Bodenteil 20 der beispielsweise topfförmigen Lochscheibe 21 schließt sich ein umlaufender Halterand 26 an. Der Halterand 26 übt eine radiale Federwirkung auf die Wandung der Längsöffnung 3 aus. Dadurch wird beim Einschieben des aus Ventilsitzkörper 16 und Lochscheibe 21 bestehenden Ventilsitzteils in die Längsöffnung 3 des Ventilsitzträgers 1 eine Spanbildung am Ventilsitzteil und an der Längsöffnung 3 vermieden. Der Halterand 26 der Lochscheibe 21 ist mit der Wandung der Längsöffnung 3 beispielsweise durch eine umlaufende und dichte zweite Schweißnaht 30 verbunden.A
Die Einschubtiefe des aus Ventilsitzkörper 16 und topfförmiger Lochscheibe 21 bestehenden Ventilsitzteils in die Längsöffnung 3 bestimmt die Voreinstellung des Hubs der Ventilnadel 5, da die eine Endstellung der Ventilnadel 5 bei nicht erregter Magnetspule 10 durch die Anlage des Ventilschließkörpers 7 an einer Ventilsitzfläche 29 des Ventilsitzkörpers 16 festgelegt ist. Die andere Endstellung der Ventilnadel 5 wird bei erregter Magnetspule 10 beispielsweise durch die Anlage des Ankers 11 an dem Kern 12 festgelegt. Der Weg zwischen diesen beiden Endstellungen der Ventilnadel 5 stellt somit den Hub dar.The insertion depth of the valve seat part consisting of
Der kugelförmige Ventilschließkörper 7 wirkt mit der sich in Strömungsrichtung kegelstumpfförmig verjüngenden Ventilsitzfläche 29 des Ventilsitzkörpers 16 zusammen, die in axialer Richtung zwischen der Führungsöffnung 15 und der unteren Stirnseite 17 des Ventilsitzkörpers 16 ausgebildet ist.The spherical valve closing body 7 interacts with the
Am Umfang des Ventilsitzträgers 1 ist an seinem stromabwärtigen, der Magnetspule 10 abgewandten Ende eine Schutzkappe 40 angeordnet und mittels beispielsweise einer Rastverbindung mit dem Ventilsitzträger 1 verbunden. Ein Dichtring 41 dient zur Abdichtung zwischen dem Umfang des Einspritzventils und einer nicht dargestellten Ventilaufnahme, beispielsweise der Ansaugleitung der Brennkraftmaschine.A
Die Figur 2 zeigt die Lochscheibe 21 mit ihren im zentralen Bereich 24 angeordneten Abspritzlöchern 25. Die beispielsweise vier Abspritzlöcher 25 befinden sich z. B. symmetrisch um die Ventillängsachse 2 in Form von Eckpunkten eines Quadrates verteilt und besitzen damit jeweils den gleichen Abstand zueinander und zur Ventillängsachse 2. Das Bodenteil 20 der Lochscheibe 21 besitzt die obere Stirnseite 44, die einer zweiten ebenen Fläche entspricht, und eine gegenüberliegende untere Stirnseite 19, die einer ersten ebenen Fläche entspricht.FIG. 2 shows the
Bisher ist es üblich, so wie in der Figur 3 dargestellt, das Stanzen der Abspritzlöcher 25 in der Lochscheibe 21 in der Richtung vorzunehmen, wie auch die Richtung der späteren Mediumströmung sein wird. Der Stanzvorgang erfolgt also bei bekannten Lochscheiben 21 von der ersten Fläche 19 aus bis hin zur zweiten Fläche 44, wobei die erste Fläche 19 im eingebauten Zustand stromaufwärts der zweiten Fläche 44 liegt.So far, it has been customary, as shown in FIG. 3, to punch the
Im Gegensatz dazu werden die Abspritzlöcher 25 am erfindungsgemäßen Einspritzventil in entgegengesetzter Richtung eingebracht. Die Stanzrichtung wird durch einen Pfeil 45 angezeigt. Die Stanzstempel des Stanzwerkzeugs treffen also zuerst auf die erste Fläche 19 des Bodenteils 20 der Lochscheibe 21, die in der späteren Einbaulage der Lochscheibe 21 am Einspritzventil stromabwärts der zweiten Fläche 44 liegt, und durchdringen das Material der Lochscheibe 21 bis zur zweiten Fläche 44, wo sie aus dem Material austreten. Die Stanzrichtung verläuft somit entgegengesetzt der Mediumströmungsrichtung (Figur 2).In contrast, the
In der Figur 3 ist ein Abspritzloch 25 in einer Lochscheibe 21 dargestellt, so wie es beim bisher üblichen Stanzen entsteht. Die bekannten Lochscheiben besitzen je nach Werkstoff eine Zugfestigkeit von 400 bis 600 N/mm². Die aus diesen Werten resultierende relativ geringe Härte ist die Ursache dafür, daß an der ersten Fläche 19 durch den Eintritt des Stanzstempels ein Stanzeinzug 50, also eine Querschnittsvergrößerung des Abspritzloches 25, auftritt, während an der zweiten Fläche 44 ein Grat 51, der über die Fläche 44 hinaussteht, entsteht. Die Folgen dieser Erscheinungen am Abspritzloch 25, die nicht maßstäblich dargestellt sind, sind vergleichsweise große Durchfluß- und Strahlwinkelstreuungen.FIG. 3 shows a
Die Figur 4 zeigt im Vergleich dazu ein Abspritzloch 25 in der Lochscheibe 21, die aus einem Material größerer Härte als dem Material der Lochscheibe 21 nach Figur 3 gefertigt ist. Die Lochscheibe 21 weist nun eine Zugfestigkeit von > 800 N/mm² auf, was ungefähr einer Vickershärte von > 300 HV1 entspricht. Die üblichen Lochscheiben 21 sind beispielsweise durch Kaltverfestigung auf eine größere Materialhärte zu bringen. Die größere Materialhärte führt dazu, daß kein bzw. nur vernachlässigbar geringer Stanzeinzug bzw. Grat auftritt. Durch die größere Sprödigkeit des Materials erfolgt nun keine Gratbildung, sondern es ergibt sich ein Stanzausbruch 52 am Abspritzloch 25, und zwar bricht das Material an der Austrittsfläche des Stanzstempels, also an der zweiten Fläche 44 aus. Dieser Stanzausbruch 52 vergrößert etwas den Querschnitt des Abspritzloches 25 nur in der Nähe der zweiten Fläche 44. Die Streuung der Durchflußmengen kann hierdurch zwar verringert werden; die Strahlwinkelstreuung bleibt durch den Stanzausbruch 52 an der stromabwärts liegenden zweiten Fläche 44 erhalten.In comparison, FIG. 4 shows a
In der Figur 5 ist nun eine Lochscheibe 21 mit einem Abspritzloch 25 teilweise dargestellt, das in entgegengesetzter Richtung zur späteren Mediumströmungsrichtung gestanzt wurde, nämlich von der ersten Fläche 19 ausgehend zur zweiten Fläche 44 hin, so wie es der Pfeil 45 für die Stanzrichtung anzeigt. Die Materialeigenschaften sind dabei die gleichen wie bei der in Figur 4 gezeigten Lochscheibe 21, die Zugfestigkeit des Materials liegt also ebenfalls bei > 800 N/mm². Der durch das Stanzen entstandene Stanzausbruch 52 liegt auch in diesem Fall an der zweiten Fläche 44 der Lochscheibe 21, jedoch im eingebauten Zustand im Einspritzventil dem Ventilschließkörper 7 zugewandt. An der stromabwärts liegenden ersten Fläche 19, an der das Medium, hier beispielsweise Brennstoff, unmittelbar aus dem Abspritzloch 25 austritt, existiert ein qualitativ guter Abspritzbereich, der durch das Stanzen kaum negative Erscheinungen aufweist. Der Übergang des Abspritzloches 25 zur ersten Fläche 19 ist also relativ scharfkantig ausgebildet und weist daher nahezu keine beim Abspritzen negative Wirkungen verursachende Verformungen auf. Insbesondere die Strahlwinkelstreuung bleibt vorteilhafterweise durch diese Anordnung sehr gering. Durch eine Variation der Stempeldurchmesser des Stanzwerkzeugs läßt sich die Streuung der Durchflußmenge noch weiter reduzieren.FIG. 5 shows a
Die erfindungsgemäße Ausgestaltung der Lochscheibe 21 ist bei jeder Form der Lochscheibe möglich, also auch bei Lochscheiben, die keinen Halterand 26 aufweisen.The configuration of the
Claims (2)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4411554 | 1994-04-02 | ||
DE4411554A DE4411554A1 (en) | 1994-04-02 | 1994-04-02 | Injector |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0675283A1 true EP0675283A1 (en) | 1995-10-04 |
EP0675283B1 EP0675283B1 (en) | 1998-06-03 |
Family
ID=6514553
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95103810A Expired - Lifetime EP0675283B1 (en) | 1994-04-02 | 1995-03-16 | Injection valve |
Country Status (5)
Country | Link |
---|---|
US (1) | US5626295A (en) |
EP (1) | EP0675283B1 (en) |
JP (1) | JPH07279798A (en) |
DE (2) | DE4411554A1 (en) |
ES (1) | ES2117317T3 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107842453A (en) * | 2016-09-20 | 2018-03-27 | 罗伯特·博世有限公司 | Fuel injection module for port fuel injection device |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5984208A (en) * | 1997-11-03 | 1999-11-16 | Caterpillar Inc. | Fuel injector having a press-in valve seat |
US6247656B1 (en) | 2000-04-26 | 2001-06-19 | Resources Conservation, Inc. | Shower head |
JP2002054533A (en) * | 2000-08-16 | 2002-02-20 | Unisia Jecs Corp | Fuel injection valve and method for manufacturing nozzle plate used in the fuel injection valve |
DE10042956A1 (en) * | 2000-08-31 | 2002-03-21 | Siemens Ag | Nozzle body for fuel injection valves has protective cap of thrmally insulating material for nozzle tip |
DE10246403B4 (en) * | 2001-10-05 | 2008-11-27 | Denso Corp., Kariya-shi | A method for producing a nozzle hole plate for an injection nozzle and injection nozzle with such a nozzle hole plate |
US6817545B2 (en) * | 2002-01-09 | 2004-11-16 | Visteon Global Technologies, Inc. | Fuel injector nozzle assembly |
US6789406B2 (en) | 2002-03-15 | 2004-09-14 | Siemens Vdo Automotive Corporation | Methods of forming angled orifices in an orifice plate |
US6945478B2 (en) | 2002-03-15 | 2005-09-20 | Siemens Vdo Automotive Corporation | Fuel injector having an orifice plate with offset coining angled orifices |
US7490784B2 (en) * | 2002-06-10 | 2009-02-17 | Siemens Aktiengesellschaft | Injector for injecting fuel |
US20040163254A1 (en) * | 2002-12-27 | 2004-08-26 | Masanori Miyagawa | Method for manufacturing injection hole member |
US20060107526A1 (en) * | 2004-11-22 | 2006-05-25 | Von Bacho Paul S Iii | Process for inserting flow passages in a work piece |
US10370177B2 (en) | 2016-11-22 | 2019-08-06 | Summit Packaging Systems, Inc. | Dual component insert with uniform discharge orifice for fine mist spray |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1994000686A1 (en) * | 1992-06-27 | 1994-01-06 | Robert Bosch Gmbh | Perforated injection plate for a valve and process for producing it |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57131567A (en) * | 1981-01-16 | 1982-08-14 | Ricoh Co Ltd | Nozzle for ink jet printer |
DE3567062D1 (en) * | 1985-10-22 | 1989-02-02 | Voest Alpine Automotive | Method of manufacturing an injection nozzle housing |
US4699323A (en) * | 1986-04-24 | 1987-10-13 | General Motors Corporation | Dual spray cone electromagnetic fuel injector |
US4923169A (en) * | 1987-12-23 | 1990-05-08 | Siemens-Bendix Automotive Electronics L.P. | Multi-stream thin edge orifice disks for valves |
US4934653A (en) * | 1987-12-23 | 1990-06-19 | Siemens-Bendix Automotive Electronics L.P. | Multi-stream thin edge orifice disks for valves |
GB8817774D0 (en) * | 1988-07-26 | 1988-09-01 | Lucas Ind Plc | Fuel injectors for i c engines |
US5052624A (en) * | 1988-03-11 | 1991-10-01 | Possis Corporation | Ultra high pressure water cleaning tool |
DE4026721A1 (en) * | 1990-08-24 | 1992-02-27 | Bosch Gmbh Robert | INJECTION VALVE AND METHOD FOR PRODUCING AN INJECTION VALVE |
US5350119A (en) * | 1993-06-01 | 1994-09-27 | Siemens Automotive L.P. | Clad metal orifice disk for fuel injectors |
-
1994
- 1994-04-02 DE DE4411554A patent/DE4411554A1/en not_active Withdrawn
-
1995
- 1995-03-16 DE DE59502382T patent/DE59502382D1/en not_active Expired - Fee Related
- 1995-03-16 ES ES95103810T patent/ES2117317T3/en not_active Expired - Lifetime
- 1995-03-16 EP EP95103810A patent/EP0675283B1/en not_active Expired - Lifetime
- 1995-04-03 US US08/415,272 patent/US5626295A/en not_active Expired - Fee Related
- 1995-04-03 JP JP7077963A patent/JPH07279798A/en not_active Abandoned
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1994000686A1 (en) * | 1992-06-27 | 1994-01-06 | Robert Bosch Gmbh | Perforated injection plate for a valve and process for producing it |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107842453A (en) * | 2016-09-20 | 2018-03-27 | 罗伯特·博世有限公司 | Fuel injection module for port fuel injection device |
CN107842453B (en) * | 2016-09-20 | 2022-04-12 | 罗伯特·博世有限公司 | Fuel injection module for port fuel injector |
Also Published As
Publication number | Publication date |
---|---|
DE59502382D1 (en) | 1998-07-09 |
EP0675283B1 (en) | 1998-06-03 |
ES2117317T3 (en) | 1998-08-01 |
US5626295A (en) | 1997-05-06 |
JPH07279798A (en) | 1995-10-27 |
DE4411554A1 (en) | 1995-10-05 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0497931B1 (en) | Fuel-injection valve and process for its manufacture | |
DE4307159B4 (en) | Spray orifice plate for a valve and method of manufacture | |
EP0718491B1 (en) | Method for manufacturing a valve | |
EP0853724A1 (en) | Fuel injection valve | |
DE19744739A1 (en) | Fuel injection valve for internal combustion engine | |
DE4446241A1 (en) | Fuel injector | |
EP1208298A1 (en) | Fuel injection valve and a method for manufacturing exit oulets on the valve | |
EP0796393B1 (en) | Electromagnetically operable valve, especially fuel injection valve | |
EP0683861B1 (en) | Electromagnetic valve | |
WO1994000686A1 (en) | Perforated injection plate for a valve and process for producing it | |
EP0646219B1 (en) | Device for injecting a fuel gas mixture | |
EP0675283B1 (en) | Injection valve | |
DE10130205A1 (en) | Fuel injector | |
DE19852980A1 (en) | Valve for the metered introduction of volatilized fuel | |
DE19835693A1 (en) | Fuel injector | |
EP0925441B1 (en) | Electromagnetically actuated valve | |
EP1115969B1 (en) | Valve for the dosed introduction of a volatilized combustible fuel into the intake line of an internal combustion engine | |
EP1613857B1 (en) | Method for producing and fixing a perforated disk | |
EP0917622A1 (en) | Valve | |
DE19627090A1 (en) | Fuel injector | |
DE10314672B4 (en) | Method for producing a perforated disc | |
DE4424463A1 (en) | Fuel injection valve with closure element acting on seat | |
DE19501833A1 (en) | Fuel injection valve for IC engine |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE ES FR GB IT SE |
|
17P | Request for examination filed |
Effective date: 19960404 |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
17Q | First examination report despatched |
Effective date: 19970808 |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): DE ES FR GB IT SE |
|
REF | Corresponds to: |
Ref document number: 59502382 Country of ref document: DE Date of ref document: 19980709 |
|
ET | Fr: translation filed | ||
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FG2A Ref document number: 2117317 Country of ref document: ES Kind code of ref document: T3 |
|
ITF | It: translation for a ep patent filed |
Owner name: STUDIO JAUMANN P. & C. S.N.C. |
|
GBT | Gb: translation of ep patent filed (gb section 77(6)(a)/1977) |
Effective date: 19980806 |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed | ||
REG | Reference to a national code |
Ref country code: GB Ref legal event code: IF02 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20030227 Year of fee payment: 9 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: ES Payment date: 20030311 Year of fee payment: 9 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20030319 Year of fee payment: 9 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: SE Payment date: 20030324 Year of fee payment: 9 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20030425 Year of fee payment: 9 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20040316 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20040317 Ref country code: ES Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20040317 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20041001 |
|
EUG | Se: european patent has lapsed | ||
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20040316 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20041130 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED. Effective date: 20050316 |
|
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FD2A Effective date: 20040317 |