EP0925441A1 - Electromagnetically actuated valve - Google Patents

Electromagnetically actuated valve

Info

Publication number
EP0925441A1
EP0925441A1 EP98928077A EP98928077A EP0925441A1 EP 0925441 A1 EP0925441 A1 EP 0925441A1 EP 98928077 A EP98928077 A EP 98928077A EP 98928077 A EP98928077 A EP 98928077A EP 0925441 A1 EP0925441 A1 EP 0925441A1
Authority
EP
European Patent Office
Prior art keywords
valve
connecting part
closing body
valve according
slots
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
Application number
EP98928077A
Other languages
German (de)
French (fr)
Other versions
EP0925441B1 (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 EP0925441A1 publication Critical patent/EP0925441A1/en
Application granted granted Critical
Publication of EP0925441B1 publication Critical patent/EP0925441B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • 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
    • Y10T29/49405—Valve or choke making
    • Y10T29/49412—Valve or choke making with assembly, disassembly or composite article making
    • Y10T29/49416—Valve or choke making with assembly, disassembly or composite article making with material shaping or cutting
    • Y10T29/49423—Valve or choke making with assembly, disassembly or composite article making with material shaping or cutting including metal deforming

Definitions

  • the invention relates to an electromagnetically actuated valve according to the preamble of the main claim. From DE-PS 38 31 196 an electromagnetically actuated valve is already known, one in one
  • the valve needle is formed by a cylindrical armature, a spherical valve closing body and a tubular or sleeve-shaped connecting part connecting the two components to one another.
  • the connecting part is made of a flat metal sheet, which is subsequently rolled or bent until it takes on a cylindrical, sleeve-like shape.
  • the connecting part has a slot which extends over its entire axial length and which can either run parallel to the axis or obliquely to the longitudinal axis of the valve.
  • the two longitudinal end faces of the metal sheets used lie opposite one another, forming the slot between them, at a constant distance.
  • valve closing body is fastened to the connecting part with a weld seam, the weld seam being interrupted at least in the region of the longitudinal slot or additionally at further points in the circumferential direction.
  • the electromagnetically actuated valve according to the invention with the characterizing features of the main claim has the advantage that it can be produced inexpensively in a particularly simple manner.
  • the advantage of a connecting part with relatively large tolerances results.
  • the connecting part With a low weight and great stability, the connecting part has a large hydraulic flow cross-section.
  • the connecting part is spring elastically towards one end, thereby facilitating the connection with the anchor 'is. Due to the resilient flexibility, the connecting part with its two half-shells is under tension in the inner
  • Opening of the armature can be inserted so that disadvantageous chip formation during the armature assembly is avoided.
  • the valve closing body can be attached very simply and securely to the unslit end of the connecting part without having to bridge slots.
  • the slots of the connecting part made of a non-magnetic material avoid undesirable eddy current formation.
  • the connecting part from a metal sheet by first punching out sheet metal sections in the form of a wristwatch and then deep-drawing them.
  • sheet metal section is deep-drawn, two molded-on sheet metal tabs are bent over in such a way that two half-shells with a semicircular cross-section are formed, the slots being formed in such a way that the elongated end faces of the two sheet metal tabs lie opposite each other at a short distance.
  • the fixed connection of the valve closing body which is, for example, spherical
  • a weld seam which is completely circumferential by 360 ° and which, due to its complete contact, has a very high dynamic strength.
  • the advantage here is the simple and safe handling of the components when attaching the weld seam, which has no interruptions due to the circumferential end of the connecting part and is therefore very homogeneous.
  • FIG. 1 shows a partially illustrated electromagnetically actuated valve
  • FIG. 2 shows a connecting part of an axially movable valve needle as a single component
  • FIG. 3 shows a plan view of the connecting part according to FIG. 2
  • FIG. 4 shows a sheet metal section for forming a connecting part.
  • an electromagnetically actuated valve in the form of an injection valve for fuel injection systems of mixture-compressing spark-ignition internal combustion engines is partially shown as an embodiment.
  • the valve has a tubular valve seat support 1, in which a longitudinal bore 3 is formed concentrically with a longitudinal valve axis 2.
  • An axially movable valve needle 6 is arranged in the longitudinal bore 3.
  • the valve is actuated electromagnetically in a known manner.
  • an electromagnetic circuit with a magnetic coil 10, a core 11 and an armature 12 is only partially shown.
  • the valve needle 6 is held by the armature 12, formed, for example, a spherical valve closing body 13 and a connecting part 14 connecting the two individual parts, the connecting part 14 having a tubular shape.
  • the return spring 8 is supported with its lower end on the upper end face of the
  • the armature 12 is connected to the end of the connecting part 14 facing away from the valve closing body 13 by a weld seam 15 and is aligned with the core 11.
  • the valve closing body 13 is also firmly connected to the end of the connecting part 14 facing away from the armature 12, for example with a weld seam 16.
  • the magnet coil 10 surrounds the core 11, which is the end of an unspecified fuel inlet connection which is enclosed by the magnet coil 10 and which serves to supply the medium to be metered by means of the valve, here fuel.
  • a tubular, metal intermediate part 19 is connected, for example by welding, concentrically to the longitudinal axis 2 of the valve.
  • a cylindrical valve seat body 25 is tightly mounted by welding in the longitudinal bore 3 running concentrically to the longitudinal axis 2 of the valve.
  • the valve seat body 25 has a fixed valve seat 26 facing the core 11.
  • the magnetic coil 10 is at least partially surrounded in the circumferential direction by at least one guide element 30, which is designed, for example, as a bracket and serves as a ferromagnetic element, one end of which rests on the core 11 and the other end of which rests on the valve seat support 1 and is used e.g. is connected by welding, soldering or an adhesive connection.
  • guide element 30 is designed, for example, as a bracket and serves as a ferromagnetic element, one end of which rests on the core 11 and the other end of which rests on the valve seat support 1 and is used e.g. is connected by welding, soldering or an adhesive connection.
  • a guide opening 31 of the valve seat body 25 is used to guide the valve closing body 13 during the axial movement.
  • the valve seat body 25 On its one lower end face 32, which faces away from the valve closing body 13, the valve seat body 25 is concentrically and firmly connected to a, for example, cup-shaped injection orifice plate 34.
  • the connection of valve seat body 25 and The spray hole disk 34 is made, for example, by a circumferential and tight weld seam 45, for example a laser. This type of assembly avoids the risk of undesired deformation of the spray hole disk 34 in the region of its at least one, for example four, spray openings 46 formed by eroding or stamping.
  • valve seat part consisting of valve seat body 25 and spray orifice plate 34 into the
  • Longitudinal bore 3 determines i.a. the setting of the stroke of the valve needle 6, since the one end position of the valve needle 6 when the solenoid 10 is not energized is determined by the contact of the valve closing body 13 on the surface of the valve seat 26 of the valve seat body 25.
  • the other end position of the valve needle 6 is determined when the solenoid 10 is excited, for example by the abutment of the upper end face of the armature 12 on a lower end face 35 of the core 11.
  • the path between these two end positions of the valve needle 6 represents the stroke.
  • the spherical valve closing body 8 interacts with the surface of the valve seat 26 of the valve seat body 25 that tapers in the shape of a truncated cone in the direction of flow and is formed downstream of the guide opening 31 of the valve seat body 25.
  • the guide opening 31 has at least one flow passage 27 which enables the medium to flow in the direction of the valve seat 26 of the valve seat body 25.
  • flow passages in the form of grooves or flats can also be provided on the valve closing body 13.
  • FIGs 2 and 3 the connecting part 14 of the valve needle 6 according to the invention is again shown as a single component before achieving the firm connections with the armature 12 and the valve closing body 13, wherein Figure 3 is a plan view of the connecting part 14 at its upstream end, at which for example, a chamfer 48 is annular.
  • Figure 3 is a plan view of the connecting part 14 at its upstream end, at which for example, a chamfer 48 is annular.
  • two elongated slots 50 are provided which penetrate radially completely through the wall and do not extend over the entire length of the connecting part 14. Rather, the slots 50, which extend parallel to the longitudinal axis 2 of the valve, run only over the major part of the axial length of the connecting part 14, namely at least over 75% of the length, for example over 90% or more.
  • the length of the unslit end 55 downstream of the slit end 51 is, for example, only about 1 mm, so that the lower blind hole volume facing the valve closing body 13 is kept very small in the longitudinal opening 52.
  • the fuel flowing from the core 11 into an inner longitudinal opening 52 reaches the outside into the longitudinal bore 3 of the valve seat carrier 1.
  • Via the flow passages 27 in the valve seat body 25 or on The circumference of the valve closing body 13 reaches the fuel up to the valve seat 26 and to the spray openings 46 provided downstream, via which the fuel is sprayed into an intake manifold or a cylinder of an internal combustion engine.
  • the slots 50 provide one Large hydraulic flow cross section through which the fuel can very quickly get from the inner longitudinal opening 52 into the longitudinal bore 3.
  • the thin-walled connecting part 14 ensures maximum stability with the lowest weight.
  • a connecting part 14 can be produced by severing individual tubular connecting parts 14 according to the required length from a commercially available tube and then introducing the slots 50 in the longitudinal direction starting from one end, for example by milling, sawing, laser cutting or the like.
  • connection part 14 can also be produced in such a way that sheet metal sections 56, as shown in FIG. 4, are produced from a flat metal sheet in a so-called wristwatch shape, for example by stamping.
  • the sheet metal section 56 consists of a central circular region 57, from which two elongated sheet metal tabs 58 extend in exactly the opposite direction.
  • the sheet metal tabs 58 have a smaller width than the diameter of the central region 57.
  • a stamp of a deep-drawing tool not shown, first engages in the region 57, as a result of which the latter is deep-drawn in a cup-shaped manner.
  • the two sheet metal flaps 58 subsequently fold about 90 ° in the deep-drawing process and are bent in a semicircular shape, so that they are two resilient
  • the connecting part 14 is optionally provided with a plurality of flow openings 60 which penetrate the walls of the two half-shells of the connecting part 14.
  • the flow openings 60 for example circular and made by punching, are indicated by dashed lines on the connecting part 14 in FIG. 2.
  • the production of the connecting part 14 from a sheet metal section 56 represents a particularly light and simple type of production, which enables the use of different materials and which allows series production in large numbers.
  • the provision of the slots 50 in the connecting part 14 makes the connecting part 14 resilient on the side facing the armature 12, so that relatively coarse tolerances can be selected for the inner opening of the armature 12 and the connecting part 14 itself. Due to the resilient flexibility, the connecting part 14 with its two half-shells can be inserted under tension into the inner opening of the armature 12. Due to the all-round connection part 14 with its slotted, non-resilient end 55, the weld seam 16 can be achieved with a very high dynamic strength.

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)
  • Manufacturing & Machinery (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Magnetically Actuated Valves (AREA)

Abstract

The invention relates to an electromagnetically actuated valve characterized in that it includes an axially moveable valve needle (6) which is formed by an armature (12), a valve closing body (13) and a connector piece (14) joining both parts. The tubular connector piece (14) has two longitudinally extended slots (50) which do not extend along the entire length of the connector piece(14) but which do extend over at least 75 % of the length thereof. Two elastic half- shells are located in the slotted area. The valve closing body (13) is secured to the non-slotted end of the connector piece (14). The valve is particularly suited for use in fuel injection systems of mixture compressing externally ignited internal combustion engines.

Description

Elektromagnetisch betatigbares VentilElectromagnetically actuated valve
Stand der TechnikState of the art
Die Erfindung geht aus von einem elektromagnetisch betätigbaren Ventil nach der Gattung des Hauptanspruchs. Aus der DE-PS 38 31 196 ist bereits ein elektromagnetisch betätigbares Ventil bekannt, das eine in einerThe invention relates to an electromagnetically actuated valve according to the preamble of the main claim. From DE-PS 38 31 196 an electromagnetically actuated valve is already known, one in one
Durchgangsbohrung eines Ventilsitzträgers axial bewegbare Ventilnadel aufweist. Die Ventilnadel wird von einem zylindrischen Anker, einem kugelförmigen Ventilschließkörper und einem beide Bauteile miteinander verbindenden röhr- bzw. hülsenförmigen Verbindungsteil gebildet. Das Verbindungsteil wird aus einem ebenen Metallblech hergestellt, das nachfolgend gerollt oder gebogen wird, bis es eine zylindrische, hülsenähnliche Form annimmt. In dieser Form weist das Verbindungsteil einen sich über seine gesamte axiale Länge erstreckenden Schlitz auf, der entweder achsparallel oder schräg zur Ventillängsachse verlaufen kann. Die beiden in Längsrichtung verlaufenden Stirnflächen der verwendeten Metallbleche liegen den Schlitz zwischen sich bildend mit konstantem Abstand einander gegenüber.Through hole of a valve seat carrier has axially movable valve needle. The valve needle is formed by a cylindrical armature, a spherical valve closing body and a tubular or sleeve-shaped connecting part connecting the two components to one another. The connecting part is made of a flat metal sheet, which is subsequently rolled or bent until it takes on a cylindrical, sleeve-like shape. In this form, the connecting part has a slot which extends over its entire axial length and which can either run parallel to the axis or obliquely to the longitudinal axis of the valve. The two longitudinal end faces of the metal sheets used lie opposite one another, forming the slot between them, at a constant distance.
Aus der DE-OS 40 08 675 ist bereits ein elektromagnetisch betätigbares Ventil bekannt, bei dem der Ventilschließkörper mit einer Schweißnaht an dem Verbindungsteil befestigt ist, wobei die Schweißnaht mindestens im Bereich des Längsschlitzes oder noch zusätzlich an weiteren Stellen in Umfangsrichtung unterbrochen ist.From DE-OS 40 08 675 an electromagnetically actuated valve is already known, in which the valve closing body is fastened to the connecting part with a weld seam, the weld seam being interrupted at least in the region of the longitudinal slot or additionally at further points in the circumferential direction.
Vorteile der ErfindungAdvantages of the invention
Das erfindungsgemäße elektromagnetisch betätigbare Ventil mit den kennzeichnenden Merkmalen des Hauptanspruchs hat den Vorteil, daß es auf besonders einfache Art und Weise kostengünstig herstellbar ist. Es ergibt sich der Vorteil eines Verbindungsteils mit relativ großen Toleranzen. Bei geringem Gewicht und großer Stabilität besitzt das Verbindungsteil einen großflächigen hydraulischen Strömungsguerschnit . Infolge der sich über einen großen Teil der axialen Länge erstreckenden Schlitze ist das Verbindungsteil zum einen Ende hin federelastisch, wodurch die Verbindung mit dem Anker erleichtert' wird. Durch die federelastische Nachgiebigkeit ist das Verbindungsteil mit seinen beiden Halbschalen unter Spannung in die innereThe electromagnetically actuated valve according to the invention with the characterizing features of the main claim has the advantage that it can be produced inexpensively in a particularly simple manner. The advantage of a connecting part with relatively large tolerances results. With a low weight and great stability, the connecting part has a large hydraulic flow cross-section. As a result of extending over a large part of the axial length of the slots, the connecting part is spring elastically towards one end, thereby facilitating the connection with the anchor 'is. Due to the resilient flexibility, the connecting part with its two half-shells is under tension in the inner
Öffnung des Ankers einschiebbar, so daß eine nachteilige Spanbildung bei der Ankermontage vermieden wird. Andererseits kann der Ventilschließkörper am ungeschlitzten Ende des Verbindungsteils sehr einfach und sicher befestigt werden, ohne Schlitze überbrücken zu müssen. Die Schlitze des aus einem unmagnetischen Material gefertigten Verbindungsteils vermeiden eine unerwünschte Wirbelstrombildung.Opening of the armature can be inserted so that disadvantageous chip formation during the armature assembly is avoided. On the other hand, the valve closing body can be attached very simply and securely to the unslit end of the connecting part without having to bridge slots. The slots of the connecting part made of a non-magnetic material avoid undesirable eddy current formation.
Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Hauptanspruch angegebenen Ventils möglich. Besonders vorteilhaft ist es, das Verbindungsteil aus einem Metallblech zu fertigen, indem Blechabschnitte in Armbanduhrform zuerst ausgestanzt und nachfolgend tiefgezogen werden. Beim Tiefziehen des Blechabschnitts werden zwei angeformte Blechlaschen derart umgebogen, daß zwei im Querschnitt halbkreisförmige Halbschalen entstehen, wobei die Schlitze dadurch gebildet werden, daß die jeweils langgestreckten Stirnflächen der beiden Blechlaschen mit geringem Abstand jeweils einander gegenüberliegen.Advantageous further developments and improvements of the valve specified in the main claim are possible through the measures listed in the subclaims. It is particularly advantageous to manufacture the connecting part from a metal sheet by first punching out sheet metal sections in the form of a wristwatch and then deep-drawing them. When the sheet metal section is deep-drawn, two molded-on sheet metal tabs are bent over in such a way that two half-shells with a semicircular cross-section are formed, the slots being formed in such a way that the elongated end faces of the two sheet metal tabs lie opposite each other at a short distance.
In vorteilhaf er Weise ist die feste Verbindung des Ventilschließkörpers, der beispielsweise kugelförmig ausgebildet ist, an dem ungeschlitzten, nicht federnden Ende des Verbindungsteils durch eine um 360° vollständig umlaufende Schweißnaht erzielbar, die aufgrund seiner vollständigen Anlage eine sehr hohe dynamische Festigkeit besitzt. Von Vorteil ist dabei die einfache und sichere Handhabbarkeit der Bauteile beim Anbringen der Schweißnaht, die keine Unterbrechungen aufgrund des umlaufenden Endes des Verbindungsteils aufweist und also sehr homogen verläuf .In an advantageous manner, the fixed connection of the valve closing body, which is, for example, spherical, can be achieved at the unslotted, non-resilient end of the connecting part by a weld seam which is completely circumferential by 360 ° and which, due to its complete contact, has a very high dynamic strength. The advantage here is the simple and safe handling of the components when attaching the weld seam, which has no interruptions due to the circumferential end of the connecting part and is therefore very homogeneous.
Zeichnungdrawing
Ausführungsbeispiele der Erfindung sind in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 ein teilweise dargestelltes elektromagnetisch betätigbares Ventil, Figur 2 ein Verbindungsteil einer axial bewegbaren Ventilnadel als Einzelbauteil, Figur 3 eine Draufsicht auf das Verbindungsteil gemäß Figur 2 und Figur 4 einen Blechabschnitt zur Ausformung eines Verbindungsteils. Beschreibung der AusführungsbeispieleEmbodiments of the invention are shown in simplified form in the drawing and explained in more detail in the following description. 1 shows a partially illustrated electromagnetically actuated valve, FIG. 2 shows a connecting part of an axially movable valve needle as a single component, FIG. 3 shows a plan view of the connecting part according to FIG. 2, and FIG. 4 shows a sheet metal section for forming a connecting part. Description of the embodiments
In der Figur 1 ist als ein Ausführungsbeispiel ein elektromagnetisch betätigbares Ventil in der Form eines Einspritzventils für Brennstoffeinspritzanlagen von gemischverdichtenden fremdgezündeten Brennkraf maschinen teilweise dargestellt. Das Ventil hat einen rohrförmigen Ventilsitzträger 1, in dem konzentrisch zu einer Ventillängsachse 2 eine Längsbohrung 3 ausgebildet ist. In der Längsbohrung 3 ist eine axial bewegliche Ventilnadel 6 angeordnet .In Figure 1, an electromagnetically actuated valve in the form of an injection valve for fuel injection systems of mixture-compressing spark-ignition internal combustion engines is partially shown as an embodiment. The valve has a tubular valve seat support 1, in which a longitudinal bore 3 is formed concentrically with a longitudinal valve axis 2. An axially movable valve needle 6 is arranged in the longitudinal bore 3.
Die elektromagnetische Betätigung des Ventils erfolgt in bekannter Weise. Zur axialen Bewegung der Ventilnadel 6 und damit zum Öffnen entgegen der Federkraft einer Rückstellfeder 8 bzw. Schließen des Ventils dient ein nur teilweise dargestellter elektromagnetischer Kreis mit einer Magnetspule 10, einem Kern 11 und einem Anker 12. Die Ventilnadel 6 wird von dem Anker 12, einem beispielsweise kugelförmigen Ventilschließkörper 13 und einem die beiden Einzelteile verbindenden Verbindungsteil 14 gebildet, wobei das Verbindungsteil 14 eine rohrförmige Gestalt aufweist. Die Rückstellfeder 8 stützt sich mit ihrem unteren Ende an der oberen Stirnfläche desThe valve is actuated electromagnetically in a known manner. For the axial movement of the valve needle 6 and thus for opening against the spring force of a return spring 8 or closing the valve, an electromagnetic circuit with a magnetic coil 10, a core 11 and an armature 12 is only partially shown. The valve needle 6 is held by the armature 12, formed, for example, a spherical valve closing body 13 and a connecting part 14 connecting the two individual parts, the connecting part 14 having a tubular shape. The return spring 8 is supported with its lower end on the upper end face of the
Verbindungsteils 14 ab. Der Anker 12 ist mit dem dem Ventilschließkörper 13 abgewandten Ende des Verbindungsteils 14 durch eine Schweißnaht 15 verbunden und auf den Kern 11 ausgerichtet. Andererseits ist auch der Ventilschließkörper 13 mit dem dem Anker 12 abgewandten Ende des Verbindungsteils 14 z.B. mit einer Schweißnaht 16 fest verbunden. Die Magnetspule 10 umgibt den Kern 11, der das sich durch die Magnetspule 10 umschließende Ende eines nicht näher gekennzeichneten Brennstoffeinlaßstutzens, der der Zufuhr des mittels des Ventils zuzumessenden Mediums, hier Brennstoff, dient, darstellt.Connection part 14 from. The armature 12 is connected to the end of the connecting part 14 facing away from the valve closing body 13 by a weld seam 15 and is aligned with the core 11. On the other hand, the valve closing body 13 is also firmly connected to the end of the connecting part 14 facing away from the armature 12, for example with a weld seam 16. The magnet coil 10 surrounds the core 11, which is the end of an unspecified fuel inlet connection which is enclosed by the magnet coil 10 and which serves to supply the medium to be metered by means of the valve, here fuel.
Mit dem unteren Ende des Kerns 11 sowie mit dem Ventilsitzträger 1 ist konzentrisch zur Ventillängsachse 2 dicht ein rohrförmiges , metallenes Zwischenteil 19 beispielsweise durch Schweißen verbunden. In das stromabwärts liegende, dem Kern 11 abgewandte Ende des Ventilsitzträgers 1 ist in der konzentrisch zur Ventillängsachse 2 verlaufenden Längsbohrung 3 ein zylinderförmiger Ventilsitzkörper 25 durch Schweißen dicht montiert. Der Ventilsitzkörper 25 weist dem Kern 11 zugewandt einen festen Ventilsitz 26 auf.With the lower end of the core 11 and with the valve seat support 1, a tubular, metal intermediate part 19 is connected, for example by welding, concentrically to the longitudinal axis 2 of the valve. In the downstream end of the valve seat carrier 1 facing away from the core 11, a cylindrical valve seat body 25 is tightly mounted by welding in the longitudinal bore 3 running concentrically to the longitudinal axis 2 of the valve. The valve seat body 25 has a fixed valve seat 26 facing the core 11.
Die Magnetspule 10 ist von wenigstens einem beispielsweise als Bügel ausgebildeten, als ferromagnetisches Element dienenden Leitelement 30 in Umfangsrichtung wenigstens teilweise umgeben, das mit seinem einen Ende an dem Kern 11 und mit seinem anderen Ende an dem Ventilsitzträger 1 anliegt und mit diesen z.B. durch Schweißen, Löten oder eine Klebeverbindung verbunden ist.The magnetic coil 10 is at least partially surrounded in the circumferential direction by at least one guide element 30, which is designed, for example, as a bracket and serves as a ferromagnetic element, one end of which rests on the core 11 and the other end of which rests on the valve seat support 1 and is used e.g. is connected by welding, soldering or an adhesive connection.
Zur Führung des Ventilschließkörpers 13 während der Axialbewegung dient eine Führungsöffnung 31 des Ventilsitzkörpers 25. An seiner einen, dem Ventilschließkörper 13 abgewandten unteren Stirnseite 32 ist der Ventilsitzkörper 25 mit einer z.B. topfförmig ausgebildeten Spritzlochscheibe 34 konzentrisch und fest verbunden. Die Verbindung von Ventilsitzkörper 25 und Spritzlochscheibe 34 erfolgt beispielsweise durch eine umlaufende und dichte, z.B. mittels eines Lasers ausgebildete Schweißnaht 45. Durch diese Art der Montage ist die Gefahr einer unerwünschten Verformung der Spritzlochscheibe 34 im Bereich seiner wenigstens einen, beispielsweise vier durch Erodieren oder Stanzen ausgeformten Abspritzöffnungen 46 vermieden.A guide opening 31 of the valve seat body 25 is used to guide the valve closing body 13 during the axial movement. On its one lower end face 32, which faces away from the valve closing body 13, the valve seat body 25 is concentrically and firmly connected to a, for example, cup-shaped injection orifice plate 34. The connection of valve seat body 25 and The spray hole disk 34 is made, for example, by a circumferential and tight weld seam 45, for example a laser. This type of assembly avoids the risk of undesired deformation of the spray hole disk 34 in the region of its at least one, for example four, spray openings 46 formed by eroding or stamping.
Die Einschubtiefe des aus Ventilsitzkörper 25 und Spritzlochscheibe 34 bestehenden Ventilsitzteils in dieThe insertion depth of the valve seat part consisting of valve seat body 25 and spray orifice plate 34 into the
Längsbohrung 3 bestimmt u.a. die Einstellung des Hubs der Ventilnadel 6, da die eine Endstellung der Ventilnadel 6 bei nicht erregter Magnetspule 10 durch die Anlage des Ventilschließkörpers 13 an der Fläche des Ventilsitzes 26 des Ventilsitzkörpers 25 festgelegt ist. Die andere Endstellung der Ventilnadel 6 wird bei erregter Magnetspule 10 beispielsweise durch die Anlage der oberen Stirnseite des Ankers 12 an einer unteren Stirnseite 35 des Kerns 11 festgelegt. Der Weg zwischen diesen beiden Endstellungen der Ventilnadel 6 stellt den Hub dar.Longitudinal bore 3 determines i.a. the setting of the stroke of the valve needle 6, since the one end position of the valve needle 6 when the solenoid 10 is not energized is determined by the contact of the valve closing body 13 on the surface of the valve seat 26 of the valve seat body 25. The other end position of the valve needle 6 is determined when the solenoid 10 is excited, for example by the abutment of the upper end face of the armature 12 on a lower end face 35 of the core 11. The path between these two end positions of the valve needle 6 represents the stroke.
Der kugelförmige Ventilschließkörper 8 wirkt mit der sich in Strömungsrichtung kegelstumpfförmig verjüngenden Fläche des Ventilsitzes 26 des Ventilsitzkörpers 25 zusammen, die stromabwärts der Führungsöffnung 31 des Ventilsitzkörpers 25 ausgebildet ist. Die Führungsöffnung 31 weist wenigstens einen Strömungsdurchlaß 27 auf, der eine Strömung des Mediums in Richtung zum Ventilsitz 26 des Ventilsitzkörpers 25 ermöglicht. Andererseits können auch am Ventilschließkörper 13 Strömungsdurchlässe in Form von Nuten oder Abflachungen vorgesehen sein. In den Figuren 2 und 3 ist das erfindungsgemäße Verbindungsteil 14 der Ventilnadel 6 nochmals als Einzelbauteil vor dem Erzielen der festen Verbindungen mit dem Anker 12 und dem Ventilschließkörper 13 dargestellt, wobei die Figur 3 eine Draufsicht auf das Verbindungsteil 14 an seinem stromaufwärtigen Ende, an dem beispielsweise eine Fase 48 ringförmig ausgeformt ist, zeigt. In der Wandung des röhr- bzw. hülsenförmigen Verbindungsteils 14 sind zwei langgestreckte, die Wandung radial vollständig durchdringende Schlitze 50 vorgesehen, die sich nicht über die gesamte Länge des Verbindungsteils 14 erstrecken. Vielmehr verlaufen die sich parallel zur Ventillängsachse 2 erstreckenden Schlitze 50 nur über den größten Teil der axialen Länge des Verbindungsteils 14, und zwar mindestens über 75% der Länge, beispielsweise über 90% oder mehr. An dem ausgeführten Verbindungsteil 14 beträgt die Länge des ungeschlitzten Endes 55 stromabwärts des Schlitzendes 51 beispielsweise nur ca. 1 mm, so daß das dem Ventilschließkörper 13 zugewandte untere Sacklochvolumen in der Längsöffnung 52 sehr klein gehalten ist.The spherical valve closing body 8 interacts with the surface of the valve seat 26 of the valve seat body 25 that tapers in the shape of a truncated cone in the direction of flow and is formed downstream of the guide opening 31 of the valve seat body 25. The guide opening 31 has at least one flow passage 27 which enables the medium to flow in the direction of the valve seat 26 of the valve seat body 25. On the other hand, flow passages in the form of grooves or flats can also be provided on the valve closing body 13. In Figures 2 and 3, the connecting part 14 of the valve needle 6 according to the invention is again shown as a single component before achieving the firm connections with the armature 12 and the valve closing body 13, wherein Figure 3 is a plan view of the connecting part 14 at its upstream end, at which for example, a chamfer 48 is annular. In the wall of the tubular or sleeve-shaped connecting part 14, two elongated slots 50 are provided which penetrate radially completely through the wall and do not extend over the entire length of the connecting part 14. Rather, the slots 50, which extend parallel to the longitudinal axis 2 of the valve, run only over the major part of the axial length of the connecting part 14, namely at least over 75% of the length, for example over 90% or more. At the connecting part 14, the length of the unslit end 55 downstream of the slit end 51 is, for example, only about 1 mm, so that the lower blind hole volume facing the valve closing body 13 is kept very small in the longitudinal opening 52.
Durch die zwei Schlitze 50, die aufgrund ihrer begrenzten Länge ein geschlossenes stromabwärtiges Ende 51 aufweisen, gelangt der aus dem Kern 11 in eine innere Längsöffnung 52 zuströmende Brennstoff nach außen in die Längsbohrung 3 des Ventilsitzträgers 1. Über die Strömungsdurchlässe 27 im Ventilsitzkörper 25 oder am Umfang des Ventilschließkörpers 13 gelangt der Brennstoff bis zum Ventilsitz 26 und zu den stromabwärts vorgesehenen Abspritzöffnungen 46, über die der Brennstoff in ein Saugrohr oder einen Zylinder einer Brennkraftmaschine abgespritzt wird. Die Schlitze 50 stellen einen großflächigen hydraulischen Strömungsquerschnitt dar, über den der Brennstoff sehr schnell aus der inneren Längsöffnung 52 in die Längsbohrung 3 gelangen kann. Das dünnwandige Verbindungsteil 14 gewährleistet bei geringstem Gewicht größte Stabilität.Through the two slots 50, which have a closed downstream end 51 due to their limited length, the fuel flowing from the core 11 into an inner longitudinal opening 52 reaches the outside into the longitudinal bore 3 of the valve seat carrier 1. Via the flow passages 27 in the valve seat body 25 or on The circumference of the valve closing body 13 reaches the fuel up to the valve seat 26 and to the spray openings 46 provided downstream, via which the fuel is sprayed into an intake manifold or a cylinder of an internal combustion engine. The slots 50 provide one Large hydraulic flow cross section through which the fuel can very quickly get from the inner longitudinal opening 52 into the longitudinal bore 3. The thin-walled connecting part 14 ensures maximum stability with the lowest weight.
Hergestellt werden kann ein Verbindungsteil 14, indem von einem handelsüblichen Rohr einzelne rohrförmige Verbindungsteile 14 entsprechend der erforderlichen Länge abgetrennt werden und anschließend in Längsrichtung von einem Ende ausgehend die Schlitze 50 eingebracht werden, beispielsweise durch Fräsen, Sägen, Laserschneiden oder ähnliches .A connecting part 14 can be produced by severing individual tubular connecting parts 14 according to the required length from a commercially available tube and then introducing the slots 50 in the longitudinal direction starting from one end, for example by milling, sawing, laser cutting or the like.
Andererseits kann die Herstellung des Verbindungsteils 14 auch derart erfolgen, daß aus einem ebenen Metallblech Blechabschnitte 56, wie einer in Figur 4 dargestellt ist, in sogenannter Armbanduhrform beispielsweise durch Stanzen hergestellt werden. Der Blechabschnitt 56 besteht aus einem zentralen kreisförmigen Bereich 57, von dem sich zwei längliche Blechlaschen 58 in genau entgegengesetzter Richtung erstrecken. Die Blechlaschen 58 weisen dabei eine geringere Breite auf als der Durchmesser des zentralen Bereichs 57. Ein Stempel eines nicht dargestellten Tiefziehwerkzeugs greift zuerst in dem Bereich 57 an, wodurch dieser napfförmig tiefgezogen wird. Durch eine entsprechende Ausformung von Stempel und Matrize des Tiefziehwerkzeugs klappen die beiden Blechlaschen 58 nachfolgend im Tiefziehprozess um rund 90° um und werden halbkreisförmig verbogen, so daß sie zwei federndeOn the other hand, the connection part 14 can also be produced in such a way that sheet metal sections 56, as shown in FIG. 4, are produced from a flat metal sheet in a so-called wristwatch shape, for example by stamping. The sheet metal section 56 consists of a central circular region 57, from which two elongated sheet metal tabs 58 extend in exactly the opposite direction. The sheet metal tabs 58 have a smaller width than the diameter of the central region 57. A stamp of a deep-drawing tool, not shown, first engages in the region 57, as a result of which the latter is deep-drawn in a cup-shaped manner. By appropriately shaping the stamp and die of the deep-drawing tool, the two sheet metal flaps 58 subsequently fold about 90 ° in the deep-drawing process and are bent in a semicircular shape, so that they are two resilient
Halbschalen des Verbindungsteils 14 bilden. Letztlich bilden die jeweils langgestreckten Stirnflächen der beiden Blechlaschen 58 die zwei Schlitze 50, indem sie mit geringem Abstand jeweils einander gegenüberliegen.Form half-shells of the connecting part 14. Ultimately, the elongated end faces form the two Sheet metal tabs 58, the two slots 50 in that they are opposite each other at a short distance.
Um eine unerwünschte Beeinflussung der Strahlform des aus den Abspritzöffnungen 46 abgespritzten Brennstoffs durch den zum Ventilsitz 26 eventuell unsymmetrisch strömenden Brennstoff zu vermeiden, wird das Verbindungsteil 14 optional mit mehreren Strömungsöffnungen 60 versehen, die die Wandungen der beiden Halbschalen des Verbindungsteils 14 durchdringen. Die beispielsweise kreisförmigen und durch Stanzen eingebrachten Strömungsöffnungen 60 sind mit Strichlinien am Verbindungsteil 14 in Figur 2 angedeutet.In order to avoid an undesirable influence on the jet shape of the fuel sprayed out of the spray openings 46 by the fuel possibly flowing asymmetrically to the valve seat 26, the connecting part 14 is optionally provided with a plurality of flow openings 60 which penetrate the walls of the two half-shells of the connecting part 14. The flow openings 60, for example circular and made by punching, are indicated by dashed lines on the connecting part 14 in FIG. 2.
Die Fertigung des Verbindungsteils 14 aus einem Blechabschnitt 56 stellt eine besonders leichte und einfache Herstellungsart dar, die den Einsatz unterschiedlicher Materialien ermöglicht und die eine Serienfertigung in großen Stückzahlen erlaubt. Durch das Vorsehen der Schlitze 50 im Verbindungsteil 14 ist das Verbindungsteil 14 auf der dem Anker 12 zugewandten Seite federelastisch, so daß für die innere Öffnung des Ankers 12 und das Verbindungsteil 14 selbst relativ grobe Toleranzen gewählt werden können. Durch die federelastische Nachgiebigkeit ist das Verbindungsteil 14 mit seinen beiden Halbschalen unter Spannung in die innere Öffnung des Ankers 12 einschiebbar. Durch das rundum an dem Ventilschließkörper 13 anliegende Verbindungsteil 14 mit seinem ngeschlitzten, nicht federnden Ende 55 ist die Schweißnaht 16 mit einer sehr hohen dynamischen Festigkeit erzielbar. The production of the connecting part 14 from a sheet metal section 56 represents a particularly light and simple type of production, which enables the use of different materials and which allows series production in large numbers. The provision of the slots 50 in the connecting part 14 makes the connecting part 14 resilient on the side facing the armature 12, so that relatively coarse tolerances can be selected for the inner opening of the armature 12 and the connecting part 14 itself. Due to the resilient flexibility, the connecting part 14 with its two half-shells can be inserted under tension into the inner opening of the armature 12. Due to the all-round connection part 14 with its slotted, non-resilient end 55, the weld seam 16 can be achieved with a very high dynamic strength.

Claims

Patentansprüche claims
1. Elektromagnetisch betätigbares Ventil, insbesondere Brennstoffeinspritzventil für Brennstoffeinspritzanlagen von gemischverdichtenden fremdgezündeten Brennkraftmaschinen, mit einer Ventillängsachse, mit einem von einer Magnetspule zumindest teilweise umgebenen Kern, mit einem Anker, mit einem Ventilschließkörper, der mit einem Ventilsitz zusammenwirkt, mit einem den Anker und den Ventilschließkörper verbindenden Verbindungsteil , dadurch gekennzeichnet, daß das Verbindungsteil (14) mit zwei die Wandung durchdringenden Schlitzen (50) versehen ist, wobei sich die Schlitze (50) von ein und derselben Stirnfläche ausgehend über mehr als 75% und weniger als 100% der axialen Länge des Verbindungsteils (14) erstrecken.1. Electromagnetically actuated valve, in particular fuel injection valve for fuel injection systems of mixed-compression spark-ignition internal combustion engines, with a longitudinal valve axis, with a core at least partially surrounded by a magnetic coil, with an armature, with a valve closing body, which cooperates with a valve seat, with an armature and a valve closing body connecting part, characterized in that the connecting part (14) is provided with two slots (50) penetrating the wall, the slots (50) starting from one and the same end face over more than 75% and less than 100% of the axial length of the connecting part (14) extend.
2. Ventil nach Anspruch 1, dadurch gekennzeichnet, daß das Verbindungsteil (14) aus einem Metallblech ausgebildet ist.2. Valve according to claim 1, characterized in that the connecting part (14) is formed from a metal sheet.
3. Ventil nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß sich die beiden Schlitze (50) um 180° gegenüberstehen und parallel zur Ventillängsachse (2) verlaufen. 3. Valve according to claim 1 or 2, characterized in that the two slots (50) face each other by 180 ° and run parallel to the valve longitudinal axis (2).
4. Ventil nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Wandung des Verbindungsteils (14) mit wenigstens einer sie durchdringenden Strömungsöffnung4. Valve according to one of the preceding claims, characterized in that the wall of the connecting part (14) with at least one flow opening penetrating it
(60) versehen ist.(60) is provided.
5. Ventil nach Anspruch 1, dadurch gekennzeichnet, daß der Ventilschließkörper (13) kugelförmig ausgebildet und mit dem ungeschlitzten Ende (55) des Verbindungsteils (14) verbunden ist .5. Valve according to claim 1, characterized in that the valve closing body (13) is spherical and is connected to the unslit end (55) of the connecting part (14).
6. Ventil nach Anspruch 5, dadurch gekennzeichnet, daß die feste Verbindung zwischen Ventilschließkörper (13) und Verbindungsteil (14) durch eine um 360° vollständig umlaufende Schweißnaht (16) erzielbar ist.6. Valve according to claim 5, characterized in that the fixed connection between the valve closing body (13) and the connecting part (14) by a 360 ° completely circumferential weld (16) can be achieved.
7. Ventil nach Anspruch 2, dadurch gekennzeichnet, daß das Verbindungsteil (14) durch Stanzen und nachfolgendes Tiefziehen herstellbar ist.7. Valve according to claim 2, characterized in that the connecting part (14) can be produced by stamping and subsequent deep drawing.
8. Ventil nach Anspruch 7, dadurch gekennzeichnet, daß ein zur Herstellung des Verbindungsteils (14) aus dem Metallblech ausgestanzter Blechabschnitt (56) die Form einer Armbanduhr mit einem zentralen kreisförmigen Bereich (57) und zwei sich von ihm aus in entgegengesetzter Richtung erstreckenden Blechlaschen (58) hat. 8. Valve according to claim 7, characterized in that a sheet metal section (56) punched out of the metal sheet for producing the connecting part (14) has the shape of a wristwatch with a central circular area (57) and two sheet metal tabs extending from it in the opposite direction (58) has.
EP98928077A 1997-07-15 1998-03-26 Electromagnetically actuated valve Expired - Lifetime EP0925441B1 (en)

Applications Claiming Priority (3)

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DE19730202 1997-07-15
DE19730202A DE19730202A1 (en) 1997-07-15 1997-07-15 Electromagnetically actuated valve
PCT/DE1998/000885 WO1999004158A1 (en) 1997-07-15 1998-03-26 Electromagnetically actuated valve

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EP0925441B1 EP0925441B1 (en) 2002-10-30

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EP (1) EP0925441B1 (en)
JP (1) JP2001502400A (en)
KR (1) KR20000068545A (en)
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JP3993594B2 (en) * 2004-09-27 2007-10-17 株式会社ケーヒン Electromagnetic fuel injection valve
DE102008048597B4 (en) * 2008-09-23 2012-04-05 Robert Bosch Gmbh Electromagnetic seat valve of a hard sealing mating
GB2519171B (en) * 2013-10-14 2016-02-17 Redd & Whyte Ltd Micro-Valve
DE102017223866A1 (en) * 2017-12-29 2019-07-04 Robert Bosch Gmbh Valve for metering a fluid, in particular fuel injection valve
CN209164045U (en) * 2018-11-19 2019-07-26 浙江锐韦机电科技有限公司 Integrated pump valve mechanism
JPWO2021090388A1 (en) * 2019-11-06 2021-05-14

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JP2001502400A (en) 2001-02-20
US6317978B2 (en) 2001-11-20
EP0925441B1 (en) 2002-10-30
WO1999004158A1 (en) 1999-01-28
DE59806106D1 (en) 2002-12-05
ES2187031T3 (en) 2003-05-16
KR20000068545A (en) 2000-11-25
BR9806201A (en) 2000-02-15
CN1095034C (en) 2002-11-27
US20010015418A1 (en) 2001-08-23
DE19730202A1 (en) 1999-01-21

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