EP0789810B1 - Fuel injection valve - Google Patents

Fuel injection valve Download PDF

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Publication number
EP0789810B1
EP0789810B1 EP96917360A EP96917360A EP0789810B1 EP 0789810 B1 EP0789810 B1 EP 0789810B1 EP 96917360 A EP96917360 A EP 96917360A EP 96917360 A EP96917360 A EP 96917360A EP 0789810 B1 EP0789810 B1 EP 0789810B1
Authority
EP
European Patent Office
Prior art keywords
valve
closing body
armature
needle portion
fuel injection
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP96917360A
Other languages
German (de)
French (fr)
Other versions
EP0789810A1 (en
Inventor
Ferdinand Reiter
Assadollah Awarzamani
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 EP0789810A1 publication Critical patent/EP0789810A1/en
Application granted granted Critical
Publication of EP0789810B1 publication Critical patent/EP0789810B1/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
    • 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
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S239/00—Fluid sprinkling, spraying, and diffusing
    • Y10S239/90—Electromagnetically actuated fuel injector having ball and seat type valve
    • 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

Definitions

  • the invention is based on a fuel injector according to the genus of claim 1 or claim 6.
  • a fuel injector is already known, the one Includes valve needle, which in turn consists of an anchor, a Valve closing member and an anchor with the z.
  • the enumerated Parts are separate parts represents that only by means of cohesive joining processes, e.g. B. by laser welding. So are at least two more cohesive through the application Joining procedures achieved before. Due to the high thermal loads in processes such as welding or soldering can lead to undesirable deformations on the Valve needle come.
  • the anchor engages around the connecting pipe completely radial and at least partially axial, since that Connection tube in a continuous longitudinal opening of the Anchor is attached.
  • the connecting pipe itself also points a continuous inner longitudinal opening in the fuel can flow towards the valve closing member, which then near the valve closing member by in the wall of the Connecting pipe inserted, radially extending Cross openings emerges.
  • a Known fuel injector which is a valve needle which has anchors from the three components, Valve needle section and valve closing body, wherein the valve needle section is sleeve-shaped and firm is connected to the armature and the valve closing body, and at which the fixed connection between the valve needle section and anchor made non-cohesively by flanging is.
  • the spherical valve closing body is as usual with such valve needles, on the sleeve-shaped Valve needle section integrally through a weld or weld spots attached.
  • JP 63-183266 A is an axially movable valve part Known as a valve needle, the only two connected together Has components. On the one hand, this is one tubular inner core (anchor) and the other around one projectile-like valve closing body attached to the anchor made of plastic. An anchor and one Valve closing body connecting sleeve-shaped Valve needle section is not provided.
  • the anchor points a sleeve shape and has a lower one Receiving area for the valve closing body.
  • the Valve closing body is used to secure it in the Receiving area of the anchor inserted and caulking fixed.
  • valve needle valve closing body and Valve needle section as a connecting part between the anchor and Valve closing body through the application of a non-integral joining process is achieved.
  • Joining processes are particularly well known for this Processes such as pressing or pressing, clamping or squeezing.
  • valve closing body It is advantageous to have one in the valve closing body provide cylindrical recess into which the sleeve-shaped Valve needle section is introduced.
  • a tensioning body In the A tensioning body is inserted, which is at least partially surrounded by the valve closing body.
  • the actual pressing i.e. the making of the solid Connection of valve needle section and valve closing body takes place only after inserting the tensioning body.
  • retractable tool is a on the bracing body axially acting pressure force applied.
  • a tool engagement side Depression knockout
  • the material of the Bracing body is now plastically deformed so that due to the good surface pressure an optimal connection between the valve needle portion and the valve closing body arises.
  • valve closing body Form cylinder section
  • the sleeve-shaped Valve needle section on the cylinder section of the Valve closing body is pushed.
  • the Valve needle section engages in the area of Cylinder section an annular body on which a press tool acts to the firm connection of valve needle section and valve closing body.
  • FIG. 1 shows it Fuel injection valve with an inventive Valve needle
  • Figure 2 shows a first connection type two Components of a valve needle
  • Figure 3 shows a second Connection type of two components of a valve needle
  • Figure 4 a third type of connection of two components of a valve needle
  • FIG. 5 shows a fourth type of connection between two components of one Valve needle
  • Figures 2 and 3 options for Connecting spherical valve closing bodies and sleeve-shaped valve needle sections
  • Fuel injection valve for fuel injection systems from mixture-compressing, spark-ignition internal combustion engines has one surrounded by a magnetic coil 1, as Fuel inlet connector serving tubular core 2, the for example, a constant over its entire length Has outer diameter.
  • stepped bobbin 3 takes a winding of Magnetic coil 1 and allows in connection with the core 2 a compact design of the injection valve in the area of Solenoid coil 1.
  • valve seat support 16 which is fixed, for example is connected to the intermediate part 12.
  • Valve seat carrier 16 runs a longitudinal bore 17, the is formed concentrically with the valve longitudinal axis 10.
  • a valve needle 18 according to the invention with a z. B. tubular or tubular Valve needle section 19 arranged.
  • valve closing body 24 At the downstream end 23 of the valve needle portion 19 is a valve closing body 24 provided, for example at least one largely has spherical outer contour and on its circumference for example, five flats 25 to flow past Fuel are provided.
  • the spherical, for example trained valve closing body 24 is there according to the invention with the tubular valve needle section 19 through the use of a non-material Joining procedure firmly connected.
  • the injection valve is actuated in a known manner Way z. B. electromagnetic.
  • Way z. B. electromagnetic For the axial movement of the Valve needle 18 and thus to open against the spring force a return spring 26 or to close the Injector serves the electromagnetic circuit with the Solenoid 1, the core 2 and an armature 27.
  • a return spring 26 or to close the Injector serves the electromagnetic circuit with the Solenoid 1, the core 2 and an armature 27.
  • armature 27 Der for example tubular anchor 27 is with a Valve closing body 24 facing away from the end 20 of this first embodiment inserted into the anchor 27 Valve needle section 19 fixed by a weld connected and aligned to the core 2.
  • the anchor 27 and connecting the valve closing body 24 Valve needle section 19 forms together with these two Components the valve needle 18th
  • Valve seat carrier 16 In the downstream end of the core 2 facing away Valve seat carrier 16 is in the longitudinal bore 17 cylindrical valve seat body 29, which has a fixed Has valve seat 30, tightly mounted by welding.
  • the valve closing body 24 to Guiding the valve closing body 24 during the Axial movement of the valve needle 18 along the Longitudinal valve axis 10 serves a guide opening 32 of the Valve seat body 29.
  • the valve closing body 24 also cooperates the tapered in the direction of flow Valve seat 30 of the valve seat body 29 together.
  • a cup-shaped, for example trained spray plate 34 firmly and tightly by a z.
  • At least one, for example, four formed by eroding or stamping Spray openings 39 are provided.
  • the insertion depth of the valve seat body 29 with the Spray plate 34 determines the size of the stroke of the Valve needle 18.
  • One end position is the Valve needle 18 when the solenoid 1 is not energized by the Installation of the valve closing body 24 on the valve seat 30 of the Valve seat body 29 set while the other End position of the valve needle 18 when the solenoid coil 1 is excited results from the installation of the armature 27 at the core end 9.
  • Adjustment sleeve 48 is used to adjust the spring preload the return spring 26 resting on the adjusting sleeve 48, which in turn is on the opposite side of the Valve needle section 19 is supported.
  • the injector is largely enclosed with a plastic extrusion 51, starting from the core 2 in the axial direction over the Solenoid coil 1 extends to the valve seat support 16.
  • plastic encapsulation 51 belongs, for example co-molded electrical connector 52.
  • valve needle 18 shows a valve needle 18 as a single component shown enlarged, with only the tubular Valve needle section 19 and valve closing body 24 are shown and on the representation of the armature 27 is waived.
  • the non-integral connection according to the invention firm connection between the valve needle portion 19 and the valve closing body 24 can thus be explained in more detail.
  • a Pipe wall radially penetrating slot 58 is provided z. B. over the entire length of the valve needle portion 19 extends and through which the anchor 27 into one Inner channel 59 of the valve needle section 19 flowing in Fuel into the longitudinal bore 17 and so to the valve seat 30 can reach.
  • a fuel flow in the Injection valve up to the at least one spray opening 39 ensures the fuel in an intake manifold or hosed a cylinder of an internal combustion engine becomes.
  • the slot 58 provides a large area hydraulic flow cross section through which the Fuel very quickly from the inner channel 59 in the Longitudinal bore 17 and the valve seat 30 can flow.
  • other, e.g. B. circular flow openings in the valve needle section 19 be provided, which then the fuel more evenly distribute the scope.
  • the manufacture of the Valve needle section 19 from a sheet metal section a particularly light and simple method of manufacture, the also allows the use of various materials.
  • this part is resilient, so that for the inner Opening of the armature 27, the valve needle section 19 itself and also the valve closing body 24 have relatively rough tolerances can be chosen because of the resilient Compliance of the valve needle section 19 with its two Ends under tension in the other components can be inserted, which also facilitates assembly.
  • valve needle 18 In the case of the valve needle 18 according to the invention, the previously usual, with an integral joining process (e.g. Welding) Valve needle section 19 and valve closing body 24 through a connection with non-cohesive Joining processes, such as pressing, clamping or squeezing, is achieved, replaced.
  • the embodiment of Figure 2 is from one side of the A recess 62 extends circumferentially in the valve closing body 24 generated, which is cylindrical and one Has diameter that is approximately the diameter of the tubular valve needle section 19 corresponds.
  • Manufacturing methods for the recess 62 are available Drilling, milling, eroding or grinding.
  • the deepening 62 extends z. B. in a spherical Valve closing body 24 up to the center of the ball or to the level of a spherical equator 63 with a dash-dot line is indicated.
  • valve needle section 19 In this recess 62 is the Valve needle section 19 with its one end section 64 pushed in, passing through the slot 58 and with it connected spring elasticity is possible Valve needle section 19 by slight compression to bring a slightly smaller diameter and so that To slide in to simplify.
  • the valve needle section 19 can then be relieved and presses with his End portion 64 due to its springback against the inner side wall of the recess 62, while a End surface 65 of the valve needle portion 19 z. B. on one Base 66 of the recess 62 stands up.
  • an additional cylindrical Bracing body 68 made of an easily deformable material (e.g. soft metal) into the valve needle portion 19 of its end face 69 opposite the end face 65 brought in.
  • the cylindrical bracing body 68 has one slightly smaller diameter than the inner channel 59 of the valve needle section 19.
  • the tensioning body slips 68 along the inner channel 59 into the recess 62 of the Valve closing body 24, where it e.g. also on the Recess base 66 rests.
  • the actual pressing, thus establishing the fixed connection of Valve needle section 19 and valve closing body 24 takes place only after inserting the tensioning body 68.
  • a tool 70 axially retractable into the inner channel 59, z. B. in the form of a stamp is on the Bracing body 68 on its end surface 65 facing away Page 72 applied an axially acting compressive force.
  • a recess 75 (Knockout) may be provided, the z. B. centrally located and has a conical contour.
  • the recess 75 in the clamping body 68 can also, depending on the tool shape trough-shaped, funnel-shaped, crater-shaped, channel-shaped or be otherwise trained.
  • valve needle 18 with a non-integral connection of Valve closing body 24 and valve needle section 19 shows the Figure 3.
  • it is for example spherical valve closing body 24 machined on one side so that there is no longer a spherical contour in this area.
  • This processing is done for. B. only on one half of the ball, so that on the other side of the ball starting from the ball equator 63 the spherical shape remains, namely as spherical Section 77, in the specific case as a hemisphere section.
  • This spherical section 77 of the valve closing body 24 accordingly cooperates with the valve seat 30.
  • valve seat 30 cooperating section 77 exactly one hemisphere represents as shown in Figure 3; it can also be bigger or be smaller.
  • contour z On the spherical section 77 opposite side is the contour z. B. means Turning, grinding or eroding so that a extending out of the spherical portion 77 Cylinder section 78 is formed.
  • This cylinder section 78 has approximately a diameter on as the inner channel 59 of the valve needle portion 19, so that the valve needle portion 19 with its one End section 64 very simply onto the cylinder section 78 can be postponed.
  • a firm connection of valve closing body 24 and Valve needle section 19 is achieved by an annular body 82 on the valve needle section 19 at its end section 64 is pushed on and / or pressed on.
  • the ring body 82 can be closed or slotted.
  • valve closing body 24 can also have any other shape have and therefore conical, cylindrical or otherwise be trained.
  • FIGs 4 and 5 show two embodiments of Valve needles 18, in which only the sleeve-shaped Valve needle section 19 and one attached to it Anchor 27 can be seen and on a representation of the on the the armature 27 opposite side of the Valve needle section 19 to be attached Valve closing body 24 is dispensed with.
  • Valve closing body 24 u. a. with the valve needle sections 19 be connected.
  • FIGs 4 and 5 but Rather, it is shown that there is a firm connection of valve needle section 19 and armature 27 also use non-integral joining methods. It when the armature 27 is stepped is particularly advantageous is executed.
  • the tube-like anchor 27 has an inner Longitudinal opening 86, which extends over the entire length of the Anchor 27 extends to u. a. also the fuel supply in To ensure direction to the valve closing body 24.
  • On Upper paragraph 87 in the longitudinal opening 86 serves, for example as a support for the return spring 26.
  • the Longitudinal opening 86 next to paragraph 87 another downstream stage 88 through which the Cross section of the longitudinal opening 86 seen in the flow direction extended.
  • the size of this level 88 is e.g. B. chosen so that the tubular valve needle portion 19 into the inner Longitudinal opening 86 of the armature 27 extends, in this way far that the valve needle portion 19 with its upper End face 69 abuts the step 88 and the diameter the longitudinal opening 86 above the step 88 the diameter of the inner channel 59 of the valve needle section 19 corresponds.
  • the valve needle section 19 is inserted into the longitudinal opening 86 pressed in, d. H.
  • valve needle section 19 can e.g. B. in its upper, surrounded by the anchor 27 Knurled area, whereby further (larger) Tolerances for the fit can be selected.
  • Press connections are based on the friction between the Connection partners due to surface pressure caused by Deformation due to an oversize of the two components to each other. The non-positive Connection can easily pull the tensile forces when opening of the injection valve act on the valve needle 18, take up.
  • valve needle section 19 In the second embodiment of a press connection between valve needle section 19 and armature 27 according to FIG. 5 the sleeve-shaped valve needle section 19 on the Outer contour of the armature 27 is pressed.
  • the outer contour of the Armature 27 extends, for example, in steps, with an outer one Level 89 e.g. B. approximately in the middle of the axial extent the armature 27 is provided. Seen in the direction of flow there is a reduction in the level 89 The outer diameter of the armature 27.
  • the inner longitudinal opening 86 in anchor 27 now extends to the upper paragraph 87 for the return spring 26 with a constant diameter.
  • the Valve needle section 19 is thus on a lower one anchor portion 90 having a reduced outer diameter pressed that the valve needle portion 19 with its upper Face 69 abuts the step 89.
  • the inner channel 59 of the Valve needle section 19 points downstream of armature 27 approximately the same diameter as the outer diameter of the lower anchor section 90.

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  • 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)

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Brennstoffeinspritzventil nach der Gattung des Anspruchs 1 bzw. des Anspruchs 6. Aus der DE-OS 40 08 675 ist bereits ein Brennstoffeinspritzventil bekannt, das eine Ventilnadel beinhaltet, die wiederum aus einem Anker, einem Ventilschließglied und einem den Anker mit dem z. B. kugelförmigen Ventilschließglied verbindenden hülsenförmigen bzw. rohrförmigen Verbindungsrohr besteht. Die aufgezählten Teile stellen getrennt voneinander gefertigte Einzelteile dar, die erst mittels stoffschlüssiger Fügeverfahren, z. B. durch Laserschweißen, miteinander verbunden werden. So liegen wenigstens zwei durch die Anwendung stoffschlüssiger Fügeverfahren erzielte Verbindungsstellen vor. Aufgrund der hohen thermischen Belastungen bei Verfahren wie Schweißen oder Löten kann es zu unerwünschten Deformationen an der Ventilnadel kommen. Der Anker umgreift das Verbindungsrohr vollständig radial und zumindest teilweise axial, da das Verbindungsrohr in einer durchgehenden Längsöffnung des Ankers befestigt ist. Das Verbindungsrohr weist selbst auch eine durchgehende innere Längsöffnung auf, in der Brennstoff in Richtung zum Ventilschließglied strömen kann, der dann nahe des Ventilschließglieds durch in der Wandung des Verbindungsrohrs eingebrachte, radial verlaufende Queröffnungen austritt.The invention is based on a fuel injector according to the genus of claim 1 or claim 6. From DE-OS 40 08 675 a fuel injector is already known, the one Includes valve needle, which in turn consists of an anchor, a Valve closing member and an anchor with the z. B. spherical valve-closing member connecting sleeve-shaped or tubular connecting tube. The enumerated Parts are separate parts represents that only by means of cohesive joining processes, e.g. B. by laser welding. So are at least two more cohesive through the application Joining procedures achieved before. Due to the high thermal loads in processes such as welding or soldering can lead to undesirable deformations on the Valve needle come. The anchor engages around the connecting pipe completely radial and at least partially axial, since that Connection tube in a continuous longitudinal opening of the Anchor is attached. The connecting pipe itself also points a continuous inner longitudinal opening in the fuel can flow towards the valve closing member, which then near the valve closing member by in the wall of the Connecting pipe inserted, radially extending Cross openings emerges.

Aus der DE 39 25 212 A1 ist bereits ein Brennstoffeinspritzventil bekannt, das eine Ventilnadel aufweist, die aus den drei Bauteilen Anker, Ventilnadelabschnitt und Ventilschließkörper besteht, wobei der Ventilnadelabschnitt hülsenförmig ausgebildet und fest mit dem Anker und dem Ventilschließkörper verbunden ist, und an der die feste Verbindung zwischen Ventilnadelabschnitt und Anker nichtstoffschlüssig durch Umbördeln vorgenommen ist. Dabei liegt eine Umbördelung des Ventilnadelabschnitts an einer Schulter innerhalb des Ankers auf, während eine durch Stauchung erzielte Verdickung des Ventilnadelabschnitts zusätzlich am stromabwärtigen Ende des Ankers anliegt. Der kugelförmige Ventilschließkörper ist, wie bei solchen Ventilnadeln üblich, an dem hülsenförmigen Ventilnadelabschnitt stoffschlüssig durch eine Schweißnaht oder Schweißpunkte befestigt.From DE 39 25 212 A1 is already a Known fuel injector, which is a valve needle which has anchors from the three components, Valve needle section and valve closing body, wherein the valve needle section is sleeve-shaped and firm is connected to the armature and the valve closing body, and at which the fixed connection between the valve needle section and anchor made non-cohesively by flanging is. There is a flanging of the valve needle section on a shoulder inside the anchor while one thickening of the Valve needle section additionally at the downstream end of the Anchor is present. The spherical valve closing body is as usual with such valve needles, on the sleeve-shaped Valve needle section integrally through a weld or weld spots attached.

Aus der JP 63-183266 A ist ein axial bewegliches Ventilteil als Ventilnadel bekannt, das nur zwei miteinander verbundene Bauteile aufweist. Dabei handelt es sich zum einen um einen rohrförmigen inneren Kern (Anker) und zum anderen um einen am Anker befestigten projektilartigen Ventilschließkörper aus Kunststoff. Ein einen Anker und einen Ventilschließkörper verbindender hülsenförmiger Ventilnadelabschnitt ist nicht vorgesehen. Der Anker weist eine Hülsenform auf und besitzt einen unteren Aufnahmebereich für den Ventilschließkörper. Der Ventilschließkörper wird zu dessen Befestigung in den Aufnahmebereich des Ankers eingeschoben und durch Verstemmen fixiert.From JP 63-183266 A is an axially movable valve part Known as a valve needle, the only two connected together Has components. On the one hand, this is one tubular inner core (anchor) and the other around one projectile-like valve closing body attached to the anchor made of plastic. An anchor and one Valve closing body connecting sleeve-shaped Valve needle section is not provided. The anchor points a sleeve shape and has a lower one Receiving area for the valve closing body. The Valve closing body is used to secure it in the Receiving area of the anchor inserted and caulking fixed.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Brennstoffeinspritzventil mit den Merkmalen des Anspruchs 1 bzw. des Anspruchs 6 hat den Vorteil, daß auf besonders einfache und kostengünstige Art und Weise eine Ventilnadel für das Einspritzventil mit sehr einfachen und sicheren Verbindungen einzelner Ventilnadelbauteile ohne die Folgen thermischer Belastung herstellbar ist. Dies wird erfindungsgemäß dadurch erreicht, daß eine feste Verbindung von den unter anderem die Ventilnadel bildenden Bauteilen Ventilschließkörper und Ventilnadelabschnitt als Verbindungsteil zwischen Anker und Ventilschließkörper durch die Anwendung eines nichtstoffschlüssigen Fügeverfahrens erzielt ist. Als Fügeverfahren eignen sich dafür besonders bekannte Verfahren, wie Ein- oder Aufpressen, Klemmen oder Quetschen. Von Vorteil ist es, daß eine sichere und zuverlässige Verbindung der beiden Bauteile der Ventilnadel erreicht wird, ohne daß es zu unerwünschten Deformationen an der Ventilnadel kommt, die besonders bei stoffschlüssigen Fügeverfahren, wie Schweißen oder Löten, aufgrund der hohen thermischen Belastungen auftreten können. Eine Kostenreduzierung wird dadurch erreicht, daß die Toleranzen der Bauteile vergleichsweise groß sein können, da durch die Fügeverfahren aufgrund der genauen Einstellung von Verfahrensparametern ein guter Ausgleich von Abweichungen möglich ist. Außerdem ist eine sehr hohe Produktivität bei der Herstellung der Ventilnadeln erzielbar, da die Fertigung sehr gut automatisiert werden kann.The fuel injector according to the invention with the Features of claim 1 and claim 6 has the Advantage that in a particularly simple and inexpensive way and way a valve needle for the injector with very simple and secure connections between individuals Valve needle components without the consequences of thermal stress can be produced. This is achieved according to the invention by that a firm connection from among others the Components forming valve needle valve closing body and Valve needle section as a connecting part between the anchor and Valve closing body through the application of a non-integral joining process is achieved. As Joining processes are particularly well known for this Processes such as pressing or pressing, clamping or squeezing. It is advantageous that it is safe and reliable Connection of the two components of the valve needle reached will, without causing undesirable deformations on the Valve needle comes especially with cohesive Joining processes, such as welding or soldering, due to the high thermal loads can occur. A Cost reduction is achieved in that the tolerances of the components can be comparatively large because of the Joining process due to the exact setting of Process parameters a good compensation of deviations is possible. It also has a very high productivity the manufacture of the valve needles achievable since the manufacture can be automated very well.

Von Vorteil ist es, in dem Ventilschließkörper eine zylindrische Vertiefung vorzusehen, in die der hülsenförmige Ventilnadelabschnitt eingebracht wird. In den Ventilnadelabschnitt wird ein Verspannkörper eingeschoben, der zumindest teilweise vom Ventilschließkörper umgeben ist. Die eigentliche Verpressung, also das Herstellen der festen Verbindung von Ventilnadelabschnitt und Ventilschließkörper erfolgt erst nach dem Einlegen des Verspannkörpers. Mit Hilfe eines in den Innenkanal des Ventilnadelabschnitts einfahrbaren Werkzeugs wird auf den Verspannkörper eine axial wirkende Druckkraft aufgebracht. Besonders vorteilhaft ist es, wenn an dessen Werkzeugeingriffseite bereits eine Vertiefung (Vorprägung) vorgesehen ist, so daß ein Verrutschen des Werkzeugs ausgeschlossen ist und die Kraftwirkung gezielt erfolgt. Das Material des Verspannkörpers wird nun plastisch so verformt, daß aufgrund der guten Flächenpressung eine optimale Verbindung zwischen dem Ventilnadelabschnitt und dem Ventilschließkörper entsteht.It is advantageous to have one in the valve closing body provide cylindrical recess into which the sleeve-shaped Valve needle section is introduced. In the A tensioning body is inserted, which is at least partially surrounded by the valve closing body. The actual pressing, i.e. the making of the solid Connection of valve needle section and valve closing body takes place only after inserting the tensioning body. With Help one in the inner channel of the valve needle section retractable tool is a on the bracing body axially acting pressure force applied. Particularly advantageous it is when there is already a tool engagement side Depression (knockout) is provided so that a Slipping of the tool is excluded and the Power is targeted. The material of the Bracing body is now plastically deformed so that due to the good surface pressure an optimal connection between the valve needle portion and the valve closing body arises.

Vorteilhaft ist es ebenso, an dem Ventilschließkörper einen Zylinderabschnitt auszubilden, wobei der hülsenförmige Ventilnadelabschnitt auf den Zylinderabschnitt des Ventilschließkörpers geschoben wird. Den Ventilnadelabschnitt umgreift im Bereich des Zylinderabschnitts ein Ringkörper, auf den ein Preßwerkzeug einwirkt, um die feste Verbindung von Ventilnadelabschnitt und Ventilschließkörper zu erreichen.It is also advantageous to have one on the valve closing body Form cylinder section, the sleeve-shaped Valve needle section on the cylinder section of the Valve closing body is pushed. The Valve needle section engages in the area of Cylinder section an annular body on which a press tool acts to the firm connection of valve needle section and valve closing body.

Durch die in den abhängigen Ansprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des in den Ansprüchen 1 und 6 angegebenen Brennstoffeinspritzventils möglich.By the measures listed in the dependent claims advantageous developments and improvements in the Claims 1 and 6 specified fuel injector possible.

Auch zum Verbinden des hülsenförmigen Ventilnadelabschnitts mit einem rohrförmigen Anker bieten sich nichtstoffschlüssige Fügeverfahren an. Besonders einfach und kostengünstig kann ein Ein- bzw. Aufpressen des Ventilnadelabschnitts in eine innere Längsöffnung des Ankers bzw. auf den äußeren Umfang des Ankers erfolgen. Von Vorteil ist es dabei, wenn der Anker innen bzw. außen gestuft ausgeführt ist, so daß die Stufen jeweils als Anschläge für die ein- bzw. aufzupressenden Ventilnadelabschnitte dienen. Also for connecting the sleeve-shaped valve needle section with a tubular anchor non-integral joining processes. Particularly simple and a pressing in or pressing the Valve needle section in an inner longitudinal opening of the armature or on the outer circumference of the anchor. Advantageous it is when the anchor is stepped inside or outside is executed so that the stages each as stops for the valve needle sections to be pressed in or pressed on.

Zeichnungdrawing

Ausführungsbeispiele der Erfindung sind in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 ein Brennstoffeinspritzventil mit einer erfindungsgemäßen Ventilnadel, Figur 2 eine erste Verbindungsart zweier Bauteile einer Ventilnadel, Figur 3 eine zweite Verbindungsart zweier Bauteile einer Ventilnadel, Figur 4 eine dritte Verbindungsart zweier Bauteile einer Ventilnadel und Figur 5 eine vierte Verbindungsart zweier Bauteile einer Ventilnadel, wobei die Figuren 2 und 3 Möglichkeiten zum Verbinden von kugelförmigen Ventilschließkörpern und hülsenförmigen Ventilnadelabschnitten und die Figuren 4 und 5 Möglichkeiten zum Verbinden von hülsenförmigen Ventilnadelabschnitten und rohrförmigen Ankern zeigen.Embodiments of the invention are in the drawing shown in simplified form and in the following Description explained in more detail. 1 shows it Fuel injection valve with an inventive Valve needle, Figure 2 shows a first connection type two Components of a valve needle, Figure 3 shows a second Connection type of two components of a valve needle, Figure 4 a third type of connection of two components of a valve needle and FIG. 5 shows a fourth type of connection between two components of one Valve needle, Figures 2 and 3 options for Connecting spherical valve closing bodies and sleeve-shaped valve needle sections and Figures 4 and 5 ways to connect sleeve-shaped Show valve needle sections and tubular anchors.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Das in der Figur 1 beispielsweise dargestellte Brennstoffeinspritzventil für Brennstoffeinspritzanlagen von gemischverdichtenden, fremdgezündeten Brennkraftmaschinen hat einen von einer Magnetspule 1 umgebenen, als Brennstoffeinlaßstutzen dienenden rohrförmigen Kern 2, der beispielsweise über seine gesamte Länge einen konstanten Außendurchmesser aufweist. Ein in radialer Richtung gestufter Spulenkörper 3 nimmt eine Bewicklung der Magnetspule 1 auf und ermöglicht in Verbindung mit dem Kern 2 einen kompakten Aufbau des Einspritzventils im Bereich der Magnetspule 1.The example shown in Figure 1 Fuel injection valve for fuel injection systems from mixture-compressing, spark-ignition internal combustion engines has one surrounded by a magnetic coil 1, as Fuel inlet connector serving tubular core 2, the for example, a constant over its entire length Has outer diameter. One in the radial direction stepped bobbin 3 takes a winding of Magnetic coil 1 and allows in connection with the core 2 a compact design of the injection valve in the area of Solenoid coil 1.

Mit einem unteren Kernende 9 des Kerns 2 ist konzentrisch zu einer Ventillängsachse 10 dicht ein rohrförmiges, metallenes Zwischenteil 12 beispielsweise durch Schweißen verbunden und umgibt das Kernende 9 teilweise axial. Stromabwärts des Spulenkörpers 3 und des Zwischenteils 12 erstreckt sich ein rohrförmiger Ventilsitzträger 16, der beispielsweise fest mit dem Zwischenteil 12 verbunden ist. In dem Ventilsitzträger 16 verläuft eine Längsbohrung 17, die konzentrisch zu der Ventillängsachse 10 ausgebildet ist. In der Längsbohrung 17 ist eine erfindungsgemäße Ventilnadel 18 mit einem z. B. hülsen- bzw. rohrförmigen Ventilnadelabschnitt 19 angeordnet. Am stromabwärtigen Ende 23 des Ventilnadelabschnitts 19 ist ein Ventilschließkörper 24 vorgesehen, der beispielsweise zumindest eine weitgehend kugelförmige Außenkontur aufweist und an dessen Umfang beispielsweise fünf Abflachungen 25 zum Vorbeiströmen des Brennstoffs vorgesehen sind. Der beispielsweise kugelförmig ausgebildete Ventilschließkörper 24 ist dabei erfindungsgemäß mit dem rohrförmigen Ventilnadelabschnitt 19 durch die Anwendung eines nichtstoffschlüssigen Fügeverfahrens fest verbunden.With a lower core end 9 of the core 2 is concentric a valve longitudinal axis 10 tightly a tubular, metallic Intermediate part 12 connected, for example, by welding and partially surrounds the core end 9 axially. Downstream of the Coil body 3 and the intermediate part 12 extends tubular valve seat support 16, which is fixed, for example is connected to the intermediate part 12. By doing Valve seat carrier 16 runs a longitudinal bore 17, the is formed concentrically with the valve longitudinal axis 10. In the longitudinal bore 17 is a valve needle 18 according to the invention with a z. B. tubular or tubular Valve needle section 19 arranged. At the downstream end 23 of the valve needle portion 19 is a valve closing body 24 provided, for example at least one largely has spherical outer contour and on its circumference for example, five flats 25 to flow past Fuel are provided. The spherical, for example trained valve closing body 24 is there according to the invention with the tubular valve needle section 19 through the use of a non-material Joining procedure firmly connected.

Die Betätigung des Einspritzventils erfolgt in bekannter Weise z. B. elektromagnetisch. Zur axialen Bewegung der Ventilnadel 18 und damit zum Öffnen entgegen der Federkraft einer Rückstellfeder 26 bzw. zum Schließen des Einspritzventils dient der elektromagnetische Kreis mit der Magnetspule 1, dem Kern 2 und einem Anker 27. Der beispielsweise rohrförmige Anker 27 ist mit einem dem Ventilschließkörper 24 abgewandten Ende 20 des in diesem ersten Ausführungsbeispiel in den Anker 27 eingeschobenen Ventilnadelabschnitts 19 durch eine Schweißnaht fest verbunden und auf den Kern 2 ausgerichtet. Der den Anker 27 und den Ventilschließkörper 24 verbindende Ventilnadelabschnitt 19 bildet zusammen mit diesen beiden Bauteilen die Ventilnadel 18.The injection valve is actuated in a known manner Way z. B. electromagnetic. For the axial movement of the Valve needle 18 and thus to open against the spring force a return spring 26 or to close the Injector serves the electromagnetic circuit with the Solenoid 1, the core 2 and an armature 27. Der for example tubular anchor 27 is with a Valve closing body 24 facing away from the end 20 of this first embodiment inserted into the anchor 27 Valve needle section 19 fixed by a weld connected and aligned to the core 2. The anchor 27 and connecting the valve closing body 24 Valve needle section 19 forms together with these two Components the valve needle 18th

In das stromabwärts liegende, dem Kern 2 abgewandte Ende des Ventilsitzträgers 16 ist in der Längsbohrung 17 ein zylinderförmiger Ventilsitzkörper 29, der einen festen Ventilsitz 30 aufweist, durch Schweißen dicht montiert. Zur Führung des Ventilschließkörpers 24 während der Axialbewegung der Ventilnadel 18 entlang der Ventillängsachse 10 dient eine Führungsöffnung 32 des Ventilsitzkörpers 29. Der Ventilschließkörper 24 wirkt mit dem sich in Strömungsrichtung kegelstumpfförmig verjüngenden Ventilsitz 30 des Ventilsitzkörpers 29 zusammen. An seiner dem Ventilschließkörper 24 abgewandten Stirnseite ist der Ventilsitzkörper 29 mit einer beispielsweise topfförmig ausgebildeten Spritzlochscheibe 34 fest und dicht durch eine z. B. mittels eines Lasers ausgebildete Schweißnaht verbunden. In der Spritzlochscheibe 34 sind wenigstens eine, beispielsweise vier durch Erodieren oder Stanzen ausgeformte Abspritzöffnungen 39 vorgesehen.In the downstream end of the core 2 facing away Valve seat carrier 16 is in the longitudinal bore 17 cylindrical valve seat body 29, which has a fixed Has valve seat 30, tightly mounted by welding. to Guiding the valve closing body 24 during the Axial movement of the valve needle 18 along the Longitudinal valve axis 10 serves a guide opening 32 of the Valve seat body 29. The valve closing body 24 also cooperates the tapered in the direction of flow Valve seat 30 of the valve seat body 29 together. At his the valve closing body 24 facing away from the end Valve seat body 29 with a cup-shaped, for example trained spray plate 34 firmly and tightly by a z. B. weld seam formed by a laser connected. At least one, for example, four formed by eroding or stamping Spray openings 39 are provided.

Die Einschubtiefe des Ventilsitzkörpers 29 mit der Spritzlochscheibe 34 bestimmt die Größe des Hubs der Ventilnadel 18. Dabei ist die eine Endstellung der Ventilnadel 18 bei nicht erregter Magnetspule 1 durch die Anlage des Ventilschließkörpers 24 am Ventilsitz 30 des Ventilsitzkörpers 29 festgelegt, während sich die andere Endstellung der Ventilnadel 18 bei erregter Magnetspule 1 durch die Anlage des Ankers 27 am Kernende 9 ergibt.The insertion depth of the valve seat body 29 with the Spray plate 34 determines the size of the stroke of the Valve needle 18. One end position is the Valve needle 18 when the solenoid 1 is not energized by the Installation of the valve closing body 24 on the valve seat 30 of the Valve seat body 29 set while the other End position of the valve needle 18 when the solenoid coil 1 is excited results from the installation of the armature 27 at the core end 9.

Eine in eine konzentrisch zur Ventillängsachse 10 verlaufende Strömungsbohrung 46 des Kerns 2 eingeschobene Einstellhülse 48 dient zur Einstellung der Federvorspannung der an der Einstellhülse 48 anliegenden Rückstellfeder 26, die sich wiederum mit ihrer gegenüberliegenden Seite an dem Ventilnadelabschnitt 19 abstützt. Das Einspritzventil ist weitgehend mit einer Kunststoffumspritzung 51 umschlossen, die sich vom Kern 2 ausgehend in axialer Richtung über die Magnetspule 1 bis zum Ventilsitzträger 16 erstreckt. Zu dieser Kunststoffumspritzung 51 gehört beispielsweise ein mitangespritzter elektrischer Anschlußstecker 52. One in a concentric to the valve longitudinal axis 10 running flow bore 46 of the core 2 inserted Adjustment sleeve 48 is used to adjust the spring preload the return spring 26 resting on the adjusting sleeve 48, which in turn is on the opposite side of the Valve needle section 19 is supported. The injector is largely enclosed with a plastic extrusion 51, starting from the core 2 in the axial direction over the Solenoid coil 1 extends to the valve seat support 16. To this plastic encapsulation 51 belongs, for example co-molded electrical connector 52.

In der Figur 2 ist eine Ventilnadel 18 als einzelnes Bauteil vergrößert dargestellt, wobei nur der rohrförmige Ventilnadelabschnitt 19 und der Ventilschließkörper 24 gezeigt sind und auf die Darstellung des Ankers 27 verzichtet wird. Die erfindungsgemäße nichtstoffschlüssige feste Verbindung zwischen dem Ventilnadelabschnitt 19 und dem Ventilschließkörper 24 kann so näher erläutert werden. In der Rohrwand des Ventilnadelabschnitts 19 ist ein die Rohrwand radial durchdringender Schlitz 58 vorgesehen, der sich z. B. über die gesamte Länge des Ventilnadelabschnitts 19 erstreckt und durch den der vom Anker 27 in einen Innenkanal 59 des Ventilnadelabschnitts 19 zuströmende Brennstoff in die Längsbohrung 17 und so zum Ventilsitz 30 gelangen kann. Letztlich wird so eine Brennstoffströmung im Einspritzventil bis zu der wenigstens einen Abspritzöffnung 39 gewährleistet, über die der Brennstoff in ein Saugrohr oder einen Zylinder einer Brennkraftmaschine abgespritzt wird. Der Schlitz 58 stellt einen großflächigen hydraulischen Strömungsquerschnitt dar, über den der Brennstoff sehr schnell aus dem Innenkanal 59 in die Längsbohrung 17 und zum Ventilsitz 30 strömen kann. Zusätzlich zum Schlitz 58 können auch andere, z. B. kreisförmige Strömungsöffnungen im Ventilnadelabschnitt 19 vorgesehen sein, die den Brennstoff dann gleichmäßiger über den Umfang verteilen. Die Fertigung des Ventilnadelabschnitts 19 aus einem Blechabschnitt stellt eine besonders leichte und einfache Herstellungsart dar, die auch den Einsatz verschiedenster Materialien ermöglicht. Durch das Vorsehen des Schlitzes 58 im Ventilnadelabschnitt 19 ist dieses Teil federelastisch, so daß für die innere Öffnung des Ankers 27, den Ventilnadelabschnitt 19 selbst und auch den Ventilschließkörper 24 relativ grobe Toleranzen gewählt werden können, da durch die federelastische Nachgiebigkeit der Ventilnadelabschnitt 19 mit seinen beiden Enden jeweils unter Spannung in die anderen Bauteile einschiebbar ist, wodurch sich auch die Montage erleichtert. 2 shows a valve needle 18 as a single component shown enlarged, with only the tubular Valve needle section 19 and valve closing body 24 are shown and on the representation of the armature 27 is waived. The non-integral connection according to the invention firm connection between the valve needle portion 19 and the valve closing body 24 can thus be explained in more detail. In the tube wall of the valve needle section 19 is a Pipe wall radially penetrating slot 58 is provided z. B. over the entire length of the valve needle portion 19 extends and through which the anchor 27 into one Inner channel 59 of the valve needle section 19 flowing in Fuel into the longitudinal bore 17 and so to the valve seat 30 can reach. Ultimately, a fuel flow in the Injection valve up to the at least one spray opening 39 ensures the fuel in an intake manifold or hosed a cylinder of an internal combustion engine becomes. The slot 58 provides a large area hydraulic flow cross section through which the Fuel very quickly from the inner channel 59 in the Longitudinal bore 17 and the valve seat 30 can flow. In addition to slot 58, other, e.g. B. circular flow openings in the valve needle section 19 be provided, which then the fuel more evenly distribute the scope. The manufacture of the Valve needle section 19 from a sheet metal section a particularly light and simple method of manufacture, the also allows the use of various materials. By providing the slot 58 in the valve needle section 19, this part is resilient, so that for the inner Opening of the armature 27, the valve needle section 19 itself and also the valve closing body 24 have relatively rough tolerances can be chosen because of the resilient Compliance of the valve needle section 19 with its two Ends under tension in the other components can be inserted, which also facilitates assembly.

Bei der erfindungsgemäßen Ventilnadel 18 soll die bisher übliche, mit einem stoffschlüssigen Fügeverfahren (z. B. Schweißen) hergestellte feste Verbindung von Ventilnadelabschnitt 19 und Ventilschließkörper 24 durch eine Verbindung, die mit nichtstoffschlüssigen Fügeverfahren, wie Einpressen, Klemmen oder Quetschen, erzielt wird, ersetzt werden. Bei einem ersten Ausführungsbeispiel nach Figur 2 wird von einer Seite des Umfangs her in dem Ventilschließkörper 24 eine Vertiefung 62 erzeugt, die zylindrisch ausgebildet ist und einen Durchmesser aufweist, der ungefähr dem Durchmesser des rohrförmigen Ventilnadelabschnitts 19 entspricht. Als Herstellungsverfahren für die Vertiefung 62 bieten sich Bohren, Fräsen, Erodieren oder Schleifen an. Die Vertiefung 62 erstreckt sich z. B. bei einem kugelförmigen Ventilschließkörper 24 bis zum Mittelpunkt der Kugel bzw. bis zur Ebene eines Kugeläquators 63, der mit einer Strich-Punkt-Linie angedeutet ist.In the case of the valve needle 18 according to the invention, the previously usual, with an integral joining process (e.g. Welding) Valve needle section 19 and valve closing body 24 through a connection with non-cohesive Joining processes, such as pressing, clamping or squeezing, is achieved, replaced. At a first The embodiment of Figure 2 is from one side of the A recess 62 extends circumferentially in the valve closing body 24 generated, which is cylindrical and one Has diameter that is approximately the diameter of the tubular valve needle section 19 corresponds. As Manufacturing methods for the recess 62 are available Drilling, milling, eroding or grinding. The deepening 62 extends z. B. in a spherical Valve closing body 24 up to the center of the ball or to the level of a spherical equator 63 with a dash-dot line is indicated.

In diese Vertiefung 62 wird nachfolgend der Ventilnadelabschnitt 19 mit seinem einen Endabschnitt 64 hineingeschoben, wobei es durch den Schlitz 58 und die damit verbundene Federelastizität möglich ist, den Ventilnadelabschnitt 19 durch geringes Zusammendrücken auf einen etwas kleineren Durchmesser zu bringen und so das Hineinschieben zu vereinfachen. Der Ventilnadelabschnitt 19 kann dann wieder entlastet werden und drückt mit seinem Endabschnitt 64 aufgrund seiner Rückfederung gegen die innere Seitenwandung der Vertiefung 62, während eine Endfläche 65 des Ventilnadelabschnitts 19 z. B. auf einem Vertiefungsgrund 66 der Vertiefung 62 aufsteht. Zur Gewährleistung sämtlicher Festigkeitsanforderungen und der gewünschten Verbindung wird ein zusätzlicher zylindrischer Verspannkörper 68 aus einem leicht deformierbaren Material (z. B. weiches Metall) in den Ventilnadelabschnitt 19 von seiner der Endfläche 65 gegenüberliegenden Stirnseite 69 her eingebracht. Der zylindrische Verspannkörper 68 weist einen geringfügig kleineren Durchmesser auf als der Innenkanal 59 des Ventilnadelabschnitts 19. So rutscht der Verspannkörper 68 im Innenkanal 59 entlang bis in die Vertiefung 62 des Ventilschließkörpers 24, wo er z.B. ebenfalls auf dem Vertiefungsgrund 66 aufliegt. Die eigentliche Verpressung, also das Herstellen der festen Verbindung von Ventilnadelabschnitt 19 und Ventilschließkörper 24 erfolgt erst nach dem Einlegen des Verspannkörpers 68. Mit Hilfe eines in den Innenkanal 59 axial einfahrbaren Werkzeugs 70, z. B. in der Form eines Druckstempels, wird auf den Verspannkörper 68 an dessen der Endfläche 65 abgewandten Seite 72 eine axial wirkende Druckkraft aufgebracht. An der oberen Seite 72 des Verspannkörpers 68 kann zum besseren Eingriff des Werkzeugs 70 bereits eine Vertiefung 75 (Vorprägung) vorgesehen sein, die z. B. zentral angeordnet ist und eine kegelförmige Kontur besitzt. Die Vertiefung 75 im Verspannkörper 68 kann je nach Werkzeugform auch muldenförmig, trichterförmig, kraterförmig, rinnenförmig oder anderweitig ausgebildet sein.In this recess 62 is the Valve needle section 19 with its one end section 64 pushed in, passing through the slot 58 and with it connected spring elasticity is possible Valve needle section 19 by slight compression to bring a slightly smaller diameter and so that To slide in to simplify. The valve needle section 19 can then be relieved and presses with his End portion 64 due to its springback against the inner side wall of the recess 62, while a End surface 65 of the valve needle portion 19 z. B. on one Base 66 of the recess 62 stands up. to Guarantee of all strength requirements and the desired connection is an additional cylindrical Bracing body 68 made of an easily deformable material (e.g. soft metal) into the valve needle portion 19 of its end face 69 opposite the end face 65 brought in. The cylindrical bracing body 68 has one slightly smaller diameter than the inner channel 59 of the valve needle section 19. The tensioning body slips 68 along the inner channel 59 into the recess 62 of the Valve closing body 24, where it e.g. also on the Recess base 66 rests. The actual pressing, thus establishing the fixed connection of Valve needle section 19 and valve closing body 24 takes place only after inserting the tensioning body 68. With the help a tool 70 axially retractable into the inner channel 59, z. B. in the form of a stamp, is on the Bracing body 68 on its end surface 65 facing away Page 72 applied an axially acting compressive force. At the upper side 72 of the tensioning body 68 can for the better Engagement of the tool 70 already a recess 75 (Knockout) may be provided, the z. B. centrally located and has a conical contour. The recess 75 in the clamping body 68 can also, depending on the tool shape trough-shaped, funnel-shaped, crater-shaped, channel-shaped or be otherwise trained.

Durch die axial einwirkende Druckkraft wird der Verspannkörper 68 plastisch so verformt, daß das radial nach außen weichende Material den Endabschnitt 64 des Ventilnadelabschnitts 19 stark an die Kontaktfläche Ventilschließkörper 24/Ventilnadelabschnitt 19 preßt. Durch die plastische Verformung des Verspannkörpers 68 wird eine sehr gute Flächenpressung und eine entsprechend optimale Verbindung erreicht. Es ist auch denkbar, anstelle des zylindrischen Verspannkörpers 68 einen Körper mit einer anderen Form zum Verpressen zu verwenden. Durch Krafteinwirkung auf eine Kugel, eine Scheibe oder einen Kegel als Verspannkörper 68, die nicht dargestellt sind, kann ebenso eine feste Verbindung zwischen Ventilschließkörper 24 und Ventilnadelabschnitt 19 erzielt werden.Due to the axially acting pressure force Bracing body 68 plastically deformed so that the radial outside softening material the end portion 64 of Valve needle section 19 strongly to the contact surface Valve closing body 24 / valve needle section 19 presses. By the plastic deformation of the tensioning body 68 becomes one very good surface pressure and a correspondingly optimal one Connection reached. It is also conceivable to replace the cylindrical bracing body 68 a body with a use another form for pressing. By Force applied to a ball, disc or one Cone as bracing body 68, which are not shown, can also establish a firm connection between Valve closing body 24 and valve needle section 19 achieved become.

Ein weiteres Ausführungsbeispiel einer Ventilnadel 18 mit einer nichtstoffschlüssigen Verbindung von Ventilschließkörper 24 und Ventilnadelabschnitt 19 zeigt die Figur 3. Bei diesem Beispiel ist der beispielsweise kugelförmige Ventilschließkörper 24 einseitig so bearbeitet, daß in diesem Bereich keine kuglige Kontur mehr vorliegt. Diese Bearbeitung erfolgt z. B. nur an einer Kugelhälfte, so daß an der anderen Kugelseite ausgehend vom Kugeläquator 63 die Kugelform erhalten bleibt, und zwar als kugliger Abschnitt 77, im konkreten Fall als Halbkugelabschnitt. Dieser kuglige Abschnitt 77 des Ventilschließkörpers 24 wirkt dementsprechend mit dem Ventilsitz 30 zusammen. Dabei ist keineswegs Bedingung, daß dieser mit dem Ventilsitz 30 zusammenwirkende Abschnitt 77 genau eine Halbkugel darstellt, wie es die Figur 3 zeigt; er kann auch größer oder kleiner sein. Auf der dem kugligen Abschnitt 77 gegenüberliegenden Seite ist die Kontur z. B. mittels Drehen, Schleifen oder Erodieren so ausgebildet, daß ein sich aus dem kugligen Abschnitt 77 heraus erstreckender Zylinderabschnitt 78 entsteht.Another embodiment of a valve needle 18 with a non-integral connection of Valve closing body 24 and valve needle section 19 shows the Figure 3. In this example it is for example spherical valve closing body 24 machined on one side so that there is no longer a spherical contour in this area. This processing is done for. B. only on one half of the ball, so that on the other side of the ball starting from the ball equator 63 the spherical shape remains, namely as spherical Section 77, in the specific case as a hemisphere section. This spherical section 77 of the valve closing body 24 accordingly cooperates with the valve seat 30. there is in no way a condition that the valve seat 30 cooperating section 77 exactly one hemisphere represents as shown in Figure 3; it can also be bigger or be smaller. On the spherical section 77 opposite side is the contour z. B. means Turning, grinding or eroding so that a extending out of the spherical portion 77 Cylinder section 78 is formed.

Dieser Zylinderabschnitt 78 weist ungefähr einen Durchmesser auf wie der Innenkanal 59 des Ventilnadelabschnitts 19, so daß der Ventilnadelabschnitt 19 mit seinem einen Endabschnitt 64 sehr einfach auf den Zylinderabschnitt 78 aufgeschoben werden kann. Dazu kann der Endabschnitt 64 des Ventilnadelabschnitts 19 beispielsweise auch leicht aufgeweitet werden. Aufgrund seiner Rückfederung drückt der Ventilnadelabschnitt 19 nach dem Aufschieben bereits gegen die äußere Mantelseite 80 des umhüllten Zylinderabschnitts 78. Eine feste Verbindung von Ventilschließkörper 24 und Ventilnadelabschnitt 19 wird erreicht, indem ein Ringkörper 82 auf den Ventilnadelabschnitt 19 an seinem Endabschnitt 64 aufgeschoben und/oder aufgepreßt wird. Der Ringkörper 82 kann geschlossen oder geschlitzt ausgeführt sein. Ein Preßwerkzeug 84 ist nur mit Pfeilen angedeutet, wobei hauptsächlich eine radiale Kraftwirkung vorliegt. Der Ringkörper 82 und der Ventilnadelabschnitt 19 stehen z. B. dabei auf einer oberen Begrenzungsfläche 85 des kugligen Abschnitts 77, die sich z. B. in der Ebene des Kugeläquators 63 befindet, auf. In den Figuren 1 bis 3 ist jeweils ein kugelförmiger Ventilschließkörper 24 dargestellt. Der Ventilschließkörper 24 kann jedoch auch jede andere Form haben und deshalb kegelförmig, zylindrisch oder anders ausgebildet sein.This cylinder section 78 has approximately a diameter on as the inner channel 59 of the valve needle portion 19, so that the valve needle portion 19 with its one End section 64 very simply onto the cylinder section 78 can be postponed. For this purpose, the end section 64 of the Valve needle section 19, for example, also slightly be expanded. Due to its springback, the Valve needle section 19 already after sliding against the outer jacket side 80 of the enveloped cylinder section 78. A firm connection of valve closing body 24 and Valve needle section 19 is achieved by an annular body 82 on the valve needle section 19 at its end section 64 is pushed on and / or pressed on. The ring body 82 can be closed or slotted. On Pressing tool 84 is only indicated with arrows, whereby there is mainly a radial force effect. The Annular body 82 and the valve needle section 19 are, for. B. thereby on an upper boundary surface 85 of the spherical Section 77, which z. B. in the plane of the spherical equator 63 is located on. In Figures 1 to 3 is one spherical valve closing body 24 shown. The However, valve closing body 24 can also have any other shape have and therefore conical, cylindrical or otherwise be trained.

Die Figuren 4 und 5 zeigen zwei Ausführungsbeispiele von Ventilnadeln 18, bei denen nur der hülsenförmige Ventilnadelabschnitt 19 und jeweils ein an ihm befestigter Anker 27 zu sehen sind und auf eine Darstellung des auf der dem Anker 27 gegenüberliegenden Seite des Ventilnadelabschnitts 19 zu befestigenden Ventilschließkörpers 24 verzichtet wird. Entsprechend den Ausführungsbeispielen nach den Figuren 2 und 3 können die Ventilschließkörper 24 u. a. mit den Ventilnadelabschnitten 19 verbunden sein. Mit den Figuren 4 und 5 soll aber vielmehr gezeigt werden, daß sich zum Herstellen einer festen Verbindung von Ventilnadelabschnitt 19 und Anker 27 ebenso nichtstoffschlüssige Fügeverfahren anwenden lassen. Besonders vorteilhaft ist es, wenn der Anker 27 gestuft ausgeführt ist. Der rohrähnliche Anker 27 weist eine innere Längsöffnung 86 auf, die sich über die gesamte Länge des Ankers 27 erstreckt, um u. a. auch die Brennstoffzufuhr in Richtung zum Ventilschließkörper 24 zu gewährleisten. Ein oberer Absatz 87 in der Längsöffnung 86 dient beispielsweise als Auflage für die Rückstellfeder 26.Figures 4 and 5 show two embodiments of Valve needles 18, in which only the sleeve-shaped Valve needle section 19 and one attached to it Anchor 27 can be seen and on a representation of the on the the armature 27 opposite side of the Valve needle section 19 to be attached Valve closing body 24 is dispensed with. According to the Embodiments according to Figures 2 and 3 can Valve closing body 24 u. a. with the valve needle sections 19 be connected. With Figures 4 and 5 but Rather, it is shown that there is a firm connection of valve needle section 19 and armature 27 also use non-integral joining methods. It when the armature 27 is stepped is particularly advantageous is executed. The tube-like anchor 27 has an inner Longitudinal opening 86, which extends over the entire length of the Anchor 27 extends to u. a. also the fuel supply in To ensure direction to the valve closing body 24. On Upper paragraph 87 in the longitudinal opening 86 serves, for example as a support for the return spring 26.

Bei dem Ausführungsbeispiel nach Figur 4 weist die Längsöffnung 86 neben dem Absatz 87 eine weitere stromabwärts liegende Stufe 88 auf, durch die sich der Querschnitt der Längsöffnung 86 in Strömungsrichtung gesehen erweitert. Die Größe dieser Stufe 88 ist z. B. so gewählt, daß der rohrförmige Ventilnadelabschnitt 19 in die innere Längsöffnung 86 des Ankers 27 hineinreicht, und zwar so weit, daß der Ventilnadelabschnitt 19 mit seiner oberen Stirnseite 69 an der Stufe 88 anliegt und der Durchmesser der Längsöffnung 86 oberhalb der Stufe 88 dem Durchmesser des Innenkanals 59 des Ventilnadelabschnitts 19 entspricht. Der Ventilnadelabschnitt 19 wird in die Längsöffnung 86 hineingepreßt, d. h. es liegt zwischen dem Anker 27 und dem Ventilnadelabschnitt 19 eine Preßpassung vor, die so eng gewählt ist, daß eine sichere und zuverlässige Verbindung auch beim Dauereinsatz in einem Einspritzventil einer Brennkraftmaschine und bei entsprechend auftretenden Erschütterungen gewährleistet ist. Der Ventilnadelabschnitt 19 kann z. B. in seinem oberen, durch den Anker 27 umgebenen Bereich eine Rändelung aufweisen, wodurch weitere (größere) Toleranzen für die Passung gewählt werden können. Preßverbindungen beruhen auf der Reibung zwischen den Verbindungspartnern infolge Flächenpressung, die durch Verformung aufgrund eines Übermaßes der beiden Bauteile zueinander hervorgerufen wird. Die kraftschlüssige Verbindung kann so problemlos die Zugkräfte, die beim Öffnen des Einspritzventils auf die Ventilnadel 18 wirken, aufnehmen.In the embodiment of Figure 4, the Longitudinal opening 86 next to paragraph 87 another downstream stage 88 through which the Cross section of the longitudinal opening 86 seen in the flow direction extended. The size of this level 88 is e.g. B. chosen so that the tubular valve needle portion 19 into the inner Longitudinal opening 86 of the armature 27 extends, in this way far that the valve needle portion 19 with its upper End face 69 abuts the step 88 and the diameter the longitudinal opening 86 above the step 88 the diameter of the inner channel 59 of the valve needle section 19 corresponds. The valve needle section 19 is inserted into the longitudinal opening 86 pressed in, d. H. it lies between the anchor 27 and the Valve needle section 19 a press fit before that so tight is chosen that a safe and reliable connection even when used continuously in an injection valve Internal combustion engine and when occurring accordingly Vibrations is guaranteed. The valve needle section 19 can e.g. B. in its upper, surrounded by the anchor 27 Knurled area, whereby further (larger) Tolerances for the fit can be selected. Press connections are based on the friction between the Connection partners due to surface pressure caused by Deformation due to an oversize of the two components to each other. The non-positive Connection can easily pull the tensile forces when opening of the injection valve act on the valve needle 18, take up.

Bei dem zweiten Ausführungsbeispiel einer Preßverbindung zwischen Ventilnadelabschnitt 19 und Anker 27 nach Figur 5 wird der hülsenförmige Ventilnadelabschnitt 19 auf die Außenkontur des Ankers 27 gepreßt. Die äußere Kontur des Ankers 27 verläuft beispielsweise gestuft, wobei eine äußere Stufe 89 z. B. ungefähr in der Mitte der axialen Erstreckung des Ankers 27 vorgesehen ist. In Strömungsrichtung gesehen erfolgt durch die Stufe 89 eine Reduzierung des Außendurchmessers des Ankers 27. Die innere Längsöffnung 86 im Anker 27 verläuft jetzt bis auf den oberen Absatz 87 für die Rückstellfeder 26 mit einem konstanten Durchmesser. Der Ventilnadelabschnitt 19 wird so auf einen unteren, den reduzierten Außendurchmesser aufweisenden Ankerabschnitt 90 gepreßt, daß der Ventilnadelabschnitt 19 mit seiner oberen Stirnseite 69 an der Stufe 89 anliegt. Der Innenkanal 59 des Ventilnadelabschnitts 19 weist stromabwärts des Ankers 27 ungefähr den Durchmesser auf wie der Außendurchmesser des unteren Ankerabschnitts 90. Die bereits oben gemachten Aussagen zum Einpressen bzw. Aufpressen gelten hier analog.In the second embodiment of a press connection between valve needle section 19 and armature 27 according to FIG. 5 the sleeve-shaped valve needle section 19 on the Outer contour of the armature 27 is pressed. The outer contour of the Armature 27 extends, for example, in steps, with an outer one Level 89 e.g. B. approximately in the middle of the axial extent the armature 27 is provided. Seen in the direction of flow there is a reduction in the level 89 The outer diameter of the armature 27. The inner longitudinal opening 86 in anchor 27 now extends to the upper paragraph 87 for the return spring 26 with a constant diameter. The Valve needle section 19 is thus on a lower one anchor portion 90 having a reduced outer diameter pressed that the valve needle portion 19 with its upper Face 69 abuts the step 89. The inner channel 59 of the Valve needle section 19 points downstream of armature 27 approximately the same diameter as the outer diameter of the lower anchor section 90. The ones already made above Statements on pressing in or pressing on apply analogously here.

Claims (11)

  1. Fuel injection valve, with a core (2) surrounded by a magnet coil (1), with a fixed valve seat (30), with an armature (27) facing the core (2), and with a valve needle (18) which cooperates with the valve seat (30) and which is formed by the armature (27), a valve-closing body (24) and a sleeve-shaped valve-needle portion (19), the valve-needle portion (19) lying between the armature (27) and the valve-closing body (24), and the armature (27), valve-needle portion (19) and valve-closing body (24) being directly connected firmly to one another, and the firm connection between the valve-needle portion (19) and the valve-closing body (24) being non-materially integral, characterized in that the valve-closing body (24) has, starting from its surface, a depression (62), into which the valve-needle portion (19) projects with an end portion (64), and the valve-needle portion (19) has, in the longitudinal direction, a continuous inner duct (59), in which is arranged a bracing body (68) which is surrounded at least partially by the valve-closing body (24) .
  2. Fuel injection valve according to Claim 1, characterized in that the depression (62) in the valve-closing body (24) is of cylindrical design and has a depression bottom (66), on which the valve-needle portion (19) and the bracing body (68) come to bear.
  3. Fuel injection valve according to Claim 2, characterized in that the depression bottom (66) of the depression (62) in the valve-closing body (24) runs through the mid-point of a spherically designed valve-closing body (24) and therefore in the plane of a sphere equator (63).
  4. Fuel injection valve according to Claim 1, characterized in that the bracing body (68) is of cylindrical design and, before the firm connection is made, possesses a slightly smaller outside diameter than the diameter of the inner duct (59) of the valve-needle portion (19).
  5. Fuel injection valve according to one of Claims 1 to 4, characterized in that the bracing body (68) has an upper side (72) which projects out of the depression (62) of the valve-closing body (24), and the upper side (72) has provided in it a depression (75), into which a tool (70) for making the firm connection can engage.
  6. Fuel injection valve, with a core (2) surrounded by a magnet coil (1), with a fixed valve seat (30), with an armature (27) facing the core (2) and with a valve needle (18) which cooperates with the valve seat (30) and which is formed by the armature (17), a valve-closing body (24) and a sleeve-shaped valve-needle portion (19), the valve-needle portion (19) lying between the armature (27) and the valve-closing body (24), and the armature (27), valve-needle portion (19) and valve-closing body (24) being directly connected firmly to one another, and the firm connection between the valve-needle portion (19) and the valve-closing body (24) being non-materially integral, characterized in that the valve-closing body (24) has a cylindrical portion (78) which projects into an inner duct (59) of an end portion (64) of the valve-needle portion (19), and an annular body (82) is pressed onto the end portion (64).
  7. Fuel injection valve according to Claim 6, characterized in that the valve-closing body (24) possesses a spherical portion (77) which is designed as a hemispherical portion, and the transition to the cylindrical portion (78) lies in the plane of a sphere equator (63).
  8. Fuel injection valve according to Claim 6 or 7, characterized in that the annular body (82) surrounding the end portion (64) of the valve-needle portion (19) is of closed or slotted design.
  9. Fuel injection valve according to Claim 1 or 6, characterized in that the firm connection between the valve-needle portion (19) of the armature (27) is likewise non-materially integral.
  10. Fuel injection valve according to Claim 9, characterized in that the valve-needle portion (19) is pressured partially into a longitudinal orifice (86) of the armature (27).
  11. Fuel injection valve according to Claim 9, characterized in that the valve-needle portion (19) is pressed partially onto the outer contour of a portion (90) of the armature (27).
EP96917360A 1995-09-06 1996-06-19 Fuel injection valve Expired - Lifetime EP0789810B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19532865A DE19532865A1 (en) 1995-09-06 1995-09-06 Fuel injector
DE19532865 1995-09-06
PCT/DE1996/001078 WO1997009528A1 (en) 1995-09-06 1996-06-19 Fuel injection valve

Publications (2)

Publication Number Publication Date
EP0789810A1 EP0789810A1 (en) 1997-08-20
EP0789810B1 true EP0789810B1 (en) 2003-09-03

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Family Applications (1)

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EP96917360A Expired - Lifetime EP0789810B1 (en) 1995-09-06 1996-06-19 Fuel injection valve

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US (1) US5875975A (en)
EP (1) EP0789810B1 (en)
JP (1) JPH10510026A (en)
CN (1) CN1067744C (en)
BR (1) BR9606621A (en)
DE (2) DE19532865A1 (en)
ES (1) ES2206577T3 (en)
WO (1) WO1997009528A1 (en)

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BR9606621A (en) 1997-09-30
CN1164885A (en) 1997-11-12
DE59610702D1 (en) 2003-10-09
EP0789810A1 (en) 1997-08-20
JPH10510026A (en) 1998-09-29
DE19532865A1 (en) 1997-03-13
US5875975A (en) 1999-03-02
ES2206577T3 (en) 2004-05-16
WO1997009528A1 (en) 1997-03-13
CN1067744C (en) 2001-06-27

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