EP0460125B1 - Electromagnetically actuated valve - Google Patents

Electromagnetically actuated valve Download PDF

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Publication number
EP0460125B1
EP0460125B1 EP90916030A EP90916030A EP0460125B1 EP 0460125 B1 EP0460125 B1 EP 0460125B1 EP 90916030 A EP90916030 A EP 90916030A EP 90916030 A EP90916030 A EP 90916030A EP 0460125 B1 EP0460125 B1 EP 0460125B1
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EP
European Patent Office
Prior art keywords
valve
closing member
process step
seat body
connection part
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
EP90916030A
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German (de)
French (fr)
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EP0460125A1 (en
Inventor
Ferdinand Reiter
Rudolf Babitzka
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Robert Bosch GmbH
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Robert Bosch GmbH
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Filing date
Publication date
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Publication of EP0460125A1 publication Critical patent/EP0460125A1/en
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Publication of EP0460125B1 publication Critical patent/EP0460125B1/en
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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
    • F02M51/0614—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of electromagnets or fixed armature
    • 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
    • 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

Definitions

  • the invention is based on an electromagnetically actuated valve according to the preamble of patent claim 1.
  • an electromagnetically actuated valve with axial fuel inflow is already known, in which a stop device which limits the opening travel of the valve closing member is provided for which, however, depending on the inclination or deviation of the valve needle consisting of valve closing member, rod and armature, leads to different attachment points and thus to different opening strokes of the valve closing member.
  • a stop device which limits the opening travel of the valve closing member is provided for which, however, depending on the inclination or deviation of the valve needle consisting of valve closing member, rod and armature, leads to different attachment points and thus to different opening strokes of the valve closing member.
  • the electromagnetically actuated valve according to the invention with the characterizing features of claim 1 has the advantage that the opening stroke of the valve closing member is not influenced by an inclined position of the valve needle. In addition, it does not apply a possibly required, non-magnetisable stop disc that creates a residual air gap. The large axial distance between the guide on the valve closing member and the armature guide also largely prevents the valve needle from tilting. It is also advantageous that the stop rod is connected to a displaceably mounted displacement sleeve, so that a simple and quick assembly of the stop rod as well as a problem-free fuel flow through the displacement sleeve is ensured.
  • valve closing member has a convex surface in the region touched by the stop rod in the open position of the valve, in order to ensure an exact stop location and thus a constant opening stroke of the valve closing member even in the case of larger oblique positions of the valve needle.
  • the stop rod has a convex surface on its end side facing the valve closing member.
  • the sliding sleeve has embossments which run in the axial direction and point radially inwards, form the contact surfaces between the sliding sleeve and the stop rod and thus enable the fixed connection of the two parts, be it by welding, soldering or by pressing.
  • a sliding sleeve designed in this way permits problem-free fuel flow despite its low manufacturing outlay.
  • a bearing bush which is pressed into the core downstream of the sliding sleeve and has openings in the flow direction for the stop rod and the fuel, as a system for the return spring acting on the valve closing member. This ensures that the spring force of the return spring is set independently of the insertion or screwing depth of the sliding sleeve into the core.
  • valve needle consisting of valve closing member, connecting tube and armature is inserted into a connecting part of the valve.
  • a valve seat body having the valve seat is introduced into a holding bore of the connecting part which is concentric with the longitudinal axis of the valve and is introduced onto the valve closing member, and the axial play of the valve needle consisting of the preselected sum of valve needle stroke and residual air gap is determined by the axial position of the valve seat body in the holding bore by the valve seat body is tight with the connecting part is connected.
  • the setting of the stroke of the valve closing member and thus also the amount of fuel sprayed off and the force of the return spring is carried out in a subsequent process step by screwing in or pressing in the displacement sleeve connected to the stop rod into a flow bore of the core, so that overall a simple and exact setting of Residual air gap and valve needle lift results.
  • valve needle consisting of valve closing member, connecting pipe and armature is inserted into a connecting part of the valve and in a next process step the residual air gap is determined by the screwing-in or pressing-in depth of a sliding sleeve connected to the stop rod into a flow bore of the core.
  • valve seat body having the valve seat is inserted into a holding bore of the connecting part, the axial positioning of the valve seat body serving to adjust the valve needle stroke and thus also the amount of fuel sprayed off and the force of the return spring, and in a final process step the valve seat body with the connecting part is tightly connected.
  • a bearing bush serves as a system for the return spring, it is particularly advantageous for the manufacture of a valve according to the invention if, in a first method step, a valve needle consisting of valve closing member, connecting tube and armature is inserted into a connecting part of the valve. In a next method step, a valve seat body having the valve seat is inserted into a holding bore of the connecting part, and the axial play of the valve needle consisting of the preselected sum of the valve needle stroke and residual air gap is determined by the axial position of the valve seat body in the holding bore and then the valve seat body is tightly connected to the connecting part. The force of the return spring is set in a subsequent process step by pressing the bearing bush into a flow hole in the core.
  • the stroke of the valve closing member is adjusted by the screwing-in or pressing-in depth of the sliding sleeve connected to the stop rod into the flow bore.
  • Another advantageous method for producing a valve according to the invention with a bearing bush serving as a system for the return spring can be described in that, in a first process step, the bearing bush first into a flow bore of the core and then a valve needle consisting of valve closing member, connecting pipe and armature into a connecting part of the valve is inserted. In a next process step, the residual air gap is determined by the screwing-in or press-in depth of the sliding sleeve connected to the stop rod into the flow bore. In a subsequent method step, a valve seat body having the valve seat is inserted into a holding bore of the connecting part, the axial positioning of the valve seat body serving to adjust the valve needle stroke, and then the valve seat body is tightly connected to the connecting part. The setting of the force of the return spring takes place in a further process step by changing the press-in depth of the bearing bush in the flow bore.
  • FIG. 1 shows a first embodiment of an inventive configured valve
  • Figure 2 shows an enlarged section through the sliding sleeve along the line II-II in Figure 1
  • Figure 3 shows a second embodiment of the valve designed according to the invention.
  • the electromagnetically actuated valve shown in FIG. 1, for example, in the form of an injection valve for fuel as an aggregate of a fuel injection system of a mixture-compressing spark-ignition internal combustion engine has a tubular metal core 1 made of ferromagnetic material, on the lower core end 2 of which a magnet coil 3 is arranged. At the upper end of the core 1, a fuel inlet port 5 is formed. Subsequent to the core end 2, a tubular intermediate part 6 is connected to the core 1 concentrically with the valve longitudinal axis 4, for example by soldering or welding.
  • the intermediate part 6 is made, for example, of non-magnetic sheet metal, which is deep-drawn and has a first connecting section 60, which extends coaxially to the valve longitudinal axis and with which it completely surrounds the core end 2 and is tightly connected to it.
  • the connecting section 60 has on its inner bore facing away from the fuel inlet connector 5 a sliding bore 67 provided with a smaller diameter, into which a cylindrical armature 12 projects and through which the armature 12 is guided.
  • the axial extension of the sliding bore 67 is small compared to the axial length of the armature 12, it is approximately 1/15 the length of the armature.
  • a collar 61 which extends radially outward from the first connecting section 60, leads to a second connecting section 62 of the intermediate part 6, which extends coaxially to the longitudinal valve axis 4 and partially extends beyond a tubular cylindrical connecting part 50 in the axial direction and is tight with it is connected, for example by soldering or welding.
  • the diameter of the second connecting section 62 is thus larger than the diameter of the first connecting section 60, so that in the assembled state the tubular connecting part 50 rests with an end face 70 on the collar 61.
  • the first connecting section 60 encompasses a holding shoulder 81 of the core end 2, which has a smaller outer diameter than the core 1, and the second connecting section 62 surrounds a holding shoulder 82 of the connecting part 50, which is also formed with a smaller outer diameter than in the adjacent area
  • the connecting part 50 made of ferromagnetic material has a holding bore 75 facing away from the end face 70, into which a valve seat body 8 is inserted in a sealed manner, for example by pressing in, screwing, welding or soldering.
  • the holding bore 75 merges into a transition bore 76 which extends to the end face 70.
  • the metal valve seat body 8 has a fixed valve seat 9 facing the core end 2.
  • the series of core 1, intermediate part 6, connecting part 50 and valve seat body 8 represents a rigid metal unit.
  • a valve closing member 14 is connected, which may have the shape of a sphere, a hemisphere or another shape, for example.
  • the connection between the connecting tube 36 and armature 12 and the valve closing member 14 and connecting tube 36 is advantageously made by welding or soldering.
  • a stop rod 40 projecting into the connecting tube 36 and in the open position of the valve touching the valve closing member 14, which has an arbitrary, for example circular, cross-sectional shape. is firmly connected to a sliding sleeve 22.
  • the sliding sleeve 22 has, as shown enlarged in FIG. 2 as an exemplary embodiment, axially directed, radially inwardly directed impressions 25.
  • These three impressions 25, for example, shown form contact surfaces between the sliding sleeve 22 and the stop rod 40, so that on the one hand a simple fixed connection of the two parts is made possible by welding, soldering or pressing, but on the other hand a problem-free fuel flow through the Sliding sleeve 22 is guaranteed.
  • the stop rod 40 is made of a non-magnetizable material, its surface, in particular on its surface facing the valve closing member 14, is hardened.
  • the setting of the spring force of the return spring 18 results from the axial positioning of the sliding sleeve 22 screwed or pressed into the flow bore 21.
  • At least a part of the core 1 and the magnet coil 3 are enclosed in their entire axial length by a plastic sheath 24, which also encloses at least a part of the intermediate part 6 and the connecting tube 36.
  • the plastic jacket 24 can be achieved by pouring or extrusion coating with plastic.
  • an electrical connector 26 integrally formed, via which the electrical contact of the solenoid 3 and thus the excitation takes place.
  • the magnet coil 3 is surrounded by at least one guide element 28 serving as a ferromagnetic element for guiding the magnetic field lines, which is made of ferromagnetic material and extends in the axial direction over the entire length of the magnet coil 3 and at least partially surrounds the magnet coil 3 in the circumferential direction.
  • at least one guide element 28 serving as a ferromagnetic element for guiding the magnetic field lines, which is made of ferromagnetic material and extends in the axial direction over the entire length of the magnet coil 3 and at least partially surrounds the magnet coil 3 in the circumferential direction.
  • the guide element 28 is designed in the form of a bracket, with an area 29 which is adapted to the contour of the magnetic coil and which only partially surrounds the magnetic coil 3 in the circumferential direction, and an end portion 31 which extends inwards in the radial direction and which partially encompasses the core 1.
  • 1 shows a valve with a guide element 28.
  • the fuel flows from the fuel inlet nozzle 5 through the armature 12 into an inner channel 38 of the connecting tube 36 and via radial through openings 37 into the transition bore 76 and from there to the valve seat 9, downstream of which at least one spray opening 17 is formed in the valve seat body 8, via which the fuel is formed in an intake manifold or a cylinder of an internal combustion engine is hosed down.
  • FIG 3 a second embodiment of the invention is shown, in which the same and equivalent parts are identified by substantially the same reference numerals as in 1 and 2.
  • a valve closing member 44 has a flat surface 48 in the region touched by a stop rod 45 in the open position of the valve.
  • the surface of the stop rod 45 is curved outwards on its end face facing the valve closing member 44.
  • a bearing bush 46 which is pressed into the flow bore 21 of the core 1 between the displacement sleeve 22 and the restoring spring 18 serves as a system for the return spring 18, which acts on the valve closing member 44 by means of the connecting tube 36.
  • the bearing bush 46 has a concentric with the valve longitudinal axis 4 trained opening for the stop rod 45 and at least one flow opening 47, which serves the fuel flow through the bearing bush 46.
  • the size of the residual air gap and the stroke of the valve closing member 14 influencing the amount of fuel sprayed off must be set as simply and precisely as possible. For this reason, it is advantageous in a first method step to insert a valve needle consisting of valve closing member 14, connecting tube 36 and armature 12 into the connecting part 50 connected to the intermediate part 6 and the core 1 and in a next method step to insert the valve seat body 8 into the holding bore 75 and to determine the axial play of the valve needle consisting of the preselected sum of the valve needle stroke and residual air gap by the axial position of the valve seat body 8 in the holding bore 75. Thereafter, the valve seat body 8 is tightly connected to the connecting part 50. The stroke of the valve closing member 14 and the force of the return spring 18 are adjusted in a subsequent process step by the screwing-in or pressing-in depth of the displacement sleeve 22 connected to the stop rod 40 into the flow bore 21.
  • Another method which is advantageous for the precise and simple setting of the residual air gap, the valve needle stroke and the force of the return spring 18 of a valve designed according to the invention is, in a first method step, to insert a valve needle consisting of valve closing member 14, connecting tube 36 and armature 12 into the one with the intermediate part 6 and insert the connecting part 50 connected to the core 1 and, in a next process step, fix the residual air gap into the flow bore 21 by the screwing-in or pressing-in depth of the sliding sleeve 22 connected to the stop rod 40.
  • the valve seat body 8 is first inserted into the holding bore 75, the axial positioning of the valve seat body 8 serving to adjust the valve needle stroke and thus also the amount of fuel sprayed off and the force of the return spring 18. The valve seat body 8 is then tightly connected to the connecting part 50.
  • the bearing bush 46 serves as a system for the return spring 18, it is advantageous for the assembly of the valve according to the invention, in a first process step, to insert a valve needle consisting of valve closing member 44, connecting tube 36 and armature 12 into the valve needle Introduce the connecting part 50 connected between the intermediate part 6 and the core 1 and, in a next method step, insert the valve seat body 8 into the holding bore 75 and the axial play of the valve needle consisting of the preselected sum of the valve needle stroke and residual air gap due to the axial position of the valve seat body 8 in the holding bore 75 to be determined.
  • valve seat body 8 is tightly connected to the connecting part 50.
  • force of the return spring 18 is set by pressing the bearing bush 46 into the flow bore 21 of the core 1.
  • the setting of the stroke of the valve closing member 44 is carried out in a further process step by the screwing-in or pressing-in depth of the stop rod 45 connected sliding sleeve 22 into the flow bore 21.
  • Another advantageous method for producing a valve according to the invention when using a bearing bush 46 serving as a system for the return spring 18, as shown in FIG. 3, consists in a first step of the process first of all the bearing bush 46 in the flow bore 21 and then a valve closure member 44, Insert the connecting tube 36 and armature 12 existing valve needle into the connecting part 50 connected to the intermediate part 6 and the core 1.
  • the residual air gap is determined by the screwing-in or press-in depth of the sliding sleeve 22 connected to the stop rod 45 into the flow bore 21.
  • the valve seat body 8 is first inserted into the holding bore 75, the axial positioning of the valve seat body 8 serving to adjust the valve needle stroke and thus also the amount of fuel sprayed off.
  • the valve seat body 8 is then tightly connected to the connecting part 50.
  • the setting of the force of the return spring 18 takes place in a further method step by changing the pressing-in depth of the bearing bush 46 into the flow bore 21.
  • the central stop rod 40 or 45 of the valve according to the invention allows a constant opening stroke of the valve closing member 14 or 44 and thus the allocation of an exactly metered amount of fuel, regardless of the inclination of the valve needle.
  • the sliding sleeve 22 connected to the stop rod 40 or 45 enables simple and precise adjustment of the residual air gap and the stroke of the valve closing member 14 or 44 when installed in the flow bore 21.

Abstract

In known electromagnetically actuated valves with axial fuel feed, the opening stroke of the valve closing element is limited by an annular stop device. If the valve needle is skewed, however, only part of the stop makes contact, and therefore the injected volume is not metered with sufficient accuracy. The new stop device makes it possible to control the opening stroke of the valve closing element whether or not the valve needle is skewed. When the valve is open, the new stop rod (40), which is concentric with the longitudinal axis (4) of the valve, touches the valve closing element (14), thereby limiting its opening stroke. The stop rod (40) is mounted in the flow hole (21) of the core (1) by means of the sliding sleeve (22). The design of the stop device is particularly suited to fuel injection valves.

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem elektromagnetisch betätigbaren Ventil nach der Gattung des Patentanspruchs 1. Aus der DE-A-31 02 642 ist schon ein elektromagnetisch betätigbares Ventil mit axialem Brennstoffzufluß bekannt, bei dem zwar eine den Öffnungsweg des Ventilschließgliedes begrenzende Anschlageinrichtung vorgesehen ist, bei der es jedoch, je nach Schiefstellung oder Abweichung der aus Ventilschließglied, Stange und Anker bestehenden Ventilnadel zu verschiedenen Anschlagorten und damit zu voneinander abweichenden Öffnungshüben des Ventilschließgliedes kommt. Außerdem besteht die Gefahr, daß bei einer mit zunehmender Betriebszeit durch ungleichmäßiges Anschlagen auftretenden Verformung der Anschlagflächen die abgespritzte Brennstoffmenge nicht mehr ausreichend genau dosiert werden kann.The invention is based on an electromagnetically actuated valve according to the preamble of patent claim 1. From DE-A-31 02 642, an electromagnetically actuated valve with axial fuel inflow is already known, in which a stop device which limits the opening travel of the valve closing member is provided for which, however, depending on the inclination or deviation of the valve needle consisting of valve closing member, rod and armature, leads to different attachment points and thus to different opening strokes of the valve closing member. In addition, there is the risk that if the operating time of the stop surfaces is deformed due to uneven striking, the amount of fuel sprayed off can no longer be dosed with sufficient accuracy.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße elektromagnetisch betätigbare Ventil mit den kennzeichnenden Merkmalen des Patentanspruchs 1 hat demgegenüber den Vorteil, daß der Öffnungshub des Ventilschließgliedes nicht durch eine Schiefstellung der Ventilnadel beeinflußt wird. Zudem entfällt eine eventuell erforderliche, einen Restluftspalt erzeugende, nicht magnetisierbare Anschlagscheibe. Der große axiale Abstand zwischen der Führung am Ventilschließglied und der Ankerführung verhindert außerdem weitgehend eine Schiefstellung der Ventilnadel. Ebenfalls vorteilhaft ist es, daß die Anschlagstange mit einer verschiebbar gelagerten Verschiebehülse verbunden ist, so daß eine einfache und schnelle Montage der Anschlagstange als auch ein problemloser Brennstofffluß durch die Verschiebehülse gewährleistet ist.The electromagnetically actuated valve according to the invention with the characterizing features of claim 1 has the advantage that the opening stroke of the valve closing member is not influenced by an inclined position of the valve needle. In addition, it does not apply a possibly required, non-magnetisable stop disc that creates a residual air gap. The large axial distance between the guide on the valve closing member and the armature guide also largely prevents the valve needle from tilting. It is also advantageous that the stop rod is connected to a displaceably mounted displacement sleeve, so that a simple and quick assembly of the stop rod as well as a problem-free fuel flow through the displacement sleeve is ensured.

Durch die in den abhängigen Patentansprüchen 2 bis 6 aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Patentanspruch 1 angegebenen Ventils möglich.The measures listed in the dependent claims 2 to 6 advantageous refinements and improvements of the valve specified in claim 1 are possible.

Besonders vorteilhaft ist es, wenn das Ventilschließglied in dem in Öffnungsstellung des Ventils durch die Anschlagstange berührten Bereich eine konvex ausgebildete Oberfläche aufweist, um auch bei größeren Schiefstellungen der Ventilnadel einen exakten Anschlagort und damit einen konstanten Öffnungshub des Ventilschließgliedes zu gewährleisten.It is particularly advantageous if the valve closing member has a convex surface in the region touched by the stop rod in the open position of the valve, in order to ensure an exact stop location and thus a constant opening stroke of the valve closing member even in the case of larger oblique positions of the valve needle.

Aus dem gleichen Grund ist es auch vorteilhaft, wenn die Anschlagstange an ihrer dem Ventilschließglied zugewandten Stirnseite eine konvex ausgebildete Oberfläche aufweist.For the same reason, it is also advantageous if the stop rod has a convex surface on its end side facing the valve closing member.

Es ist vorteilhaft, wenn die Verschiebehülse in axialer Richtung verlaufende, radial nach innen weisende Einprägungen aufweist, die Berührungsflächen zwischen der Verschiebehülse und der Anschlagstange ausbilden und so die feste Verbindung beider Teile, sei es durch Schweißen, Löten oder durch Pressen ermöglichen. Vor allem erlaubt eine derart ausgebildete Verschiebehülse trotz ihres geringen fertigungstechnischen Aufwandes einen problemlosen Brennstoffdurchfluß.It is advantageous if the sliding sleeve has embossments which run in the axial direction and point radially inwards, form the contact surfaces between the sliding sleeve and the stop rod and thus enable the fixed connection of the two parts, be it by welding, soldering or by pressing. Above all, a sliding sleeve designed in this way permits problem-free fuel flow despite its low manufacturing outlay.

Besonders vorteilhaft ist es, wenn die Verschiebehülse einer auf das Ventilschließglied wirkenden Rückstellfeder als Anlage dient, so daß sich eine einfache und kostengünstige Montage ergibt.It is particularly advantageous if the sliding sleeve of a return spring acting on the valve closing member serves as a system, so that there is a simple and inexpensive assembly.

Vorteilhaft ist es ebenfalls, als Anlage für die auf das Ventilschließglied wirkende Rückstellfeder eine in den Kern stromabwärts der Verschiebehülse eingepreßte, in Strömungsrichtung Öffnungen für die Anschlagstange und den Brennstoff aufweisende Lagerbuchse zu verwenden. So wird eine von der Einpreß- oder Einschraubtiefe der Verschiebehülse in den Kern unabhängige Einstellung der Federkraft der Rückstellfeder gewährleistet.It is also advantageous to use a bearing bush, which is pressed into the core downstream of the sliding sleeve and has openings in the flow direction for the stop rod and the fuel, as a system for the return spring acting on the valve closing member. This ensures that the spring force of the return spring is set independently of the insertion or screwing depth of the sliding sleeve into the core.

Bei der Herstellung des erfindungsgemäßen Ventils ist es besonders vorteilhaft, wenn in einem ersten Verfahrensschritt eine aus Ventilschließglied, Verbindungsrohr und Anker bestehende Ventilnadel in ein Verbindungsteil des Ventils eingeführt wird. In einem nächsten Verfahrensschritt wird ein den Ventilsitz aufweisender Ventilsitzkörper in eine konzentrisch zur Ventillängsachse ausgebildete Haltebohrung des Verbindungsteiles auf das Ventilschließglied ausgerichtet eingeführt und das aus der vorgewählten Summe von Ventilnadelhub und Restluftspalt bestehende Axialspiel der Ventilnadel durch die axiale Position des Ventilsitzkörpers in der Haltebohrung festgelegt, indem der Ventilsitzkörper mit dem Verbindungsteil dicht verbunden wird. Die Einstellung des Hubes des Ventilschließgliedes und damit auch der abgespritzten Brennstoffmenge sowie der Kraft der Rückstellfeder erfolgt in einem folgenden Verfahrensschritt durch die Einschraub- oder Einpreßtiefe der mit der Anschlagstange verbundenen Verschiebehülse in eine Strömungsbohrung des Kerns, so daß sich insgesamt eine einfache und exakte Einstellung von Restluftspalt und Ventilnadelhub ergibt.In the manufacture of the valve according to the invention, it is particularly advantageous if, in a first method step, a valve needle consisting of valve closing member, connecting tube and armature is inserted into a connecting part of the valve. In a next process step, a valve seat body having the valve seat is introduced into a holding bore of the connecting part which is concentric with the longitudinal axis of the valve and is introduced onto the valve closing member, and the axial play of the valve needle consisting of the preselected sum of valve needle stroke and residual air gap is determined by the axial position of the valve seat body in the holding bore by the valve seat body is tight with the connecting part is connected. The setting of the stroke of the valve closing member and thus also the amount of fuel sprayed off and the force of the return spring is carried out in a subsequent process step by screwing in or pressing in the displacement sleeve connected to the stop rod into a flow bore of the core, so that overall a simple and exact setting of Residual air gap and valve needle lift results.

Um den Restluftspalt und den Ventilnadelhub genau und einfach einstellen zu können, ist es zur Herstellung des erfindungsgemäßen Ventils ebenfalls vorteilhaft, wenn in einem ersten Verfahrensschritt eine aus Ventilschließglied, Verbindungsrohr und Anker bestehende Ventilnadel in ein Verbindungsteil des Ventils eingeführt und in einem nächsten Verfahrensschritt der Restluftspalt durch die Einschraub- oder Einpreßtiefe einer mit der Anschlagstange verbundenen Verschiebehülse in eine Strömungsbohrung des Kerns festgelegt wird. In einem folgenden Verfahrensschritt wird ein den Ventilsitz aufweisender der Ventilsitzkörper in eine Haltebohrung des Verbindungsteils eingeführt, wobei die axiale Positionierung des Ventilsitzkörpers zur Einstellung des Ventilnadelhubes und damit auch der abgespritzten Brennstoffmenge sowie der Kraft der Rückstellfeder dient und in einem abschließenden Verfahrensschritt der Ventilsitzkörper mit dem Verbindungsteil dicht verbunden wird.In order to be able to set the residual air gap and the valve needle stroke precisely and easily, it is also advantageous for the manufacture of the valve according to the invention if, in a first process step, a valve needle consisting of valve closing member, connecting pipe and armature is inserted into a connecting part of the valve and in a next process step the residual air gap is determined by the screwing-in or pressing-in depth of a sliding sleeve connected to the stop rod into a flow bore of the core. In a subsequent process step, the valve seat body having the valve seat is inserted into a holding bore of the connecting part, the axial positioning of the valve seat body serving to adjust the valve needle stroke and thus also the amount of fuel sprayed off and the force of the return spring, and in a final process step the valve seat body with the connecting part is tightly connected.

Dient eine Lagerbuchse als Anlage für die Rückstellfeder, so ist es für die Herstellung eines erfindungsgemäßen Ventils besonders vorteilhaft, wenn in einem ersten Verfahrensschritt eine aus Ventilschließglied, Verbindungsrohr und Anker bestehende Ventilnadel in ein Verbindungsteil des Ventils eingeführt wird. In einem nächsten Verfahrensschritt wird ein den Ventilsitz aufweisender Ventilsitzkörper in eine Haltebohrung des Verbindungsteils eingeführt, das aus der vorgewählten Summe von Ventilnadelhub und Restluftspalt bestehende Axialspiel der Ventilnadel durch die axiale Position des Ventilsitzkörpers in der Haltebohrung festgelegt und anschließend der Ventilsitzkörper mit dem Verbindungsteil dicht verbunden. Die Kraft der Rückstellfeder wird in einem folgenden Verfahrensschritt eingestellt, indem die Lagerbuchse in eine Strömungsbohrung des Kerns eingepreßt wird. In einem weiteren Verfahrensschritt erfolgt die Einstellung des Hubes des Ventilschließgliedes durch die Einschraub- oder Einpreßtiefe der mit der Anschlagstange verbundenen Verschiebehülse in die Strömungsbohrung. Das bedeutet, daß bei diesem Verfahren eine von der Einschraub- oder Einpreßtiefe der Verschiebehülse unabhängige Einstellung der Kraft der Rückstellfeder durchführbar ist.If a bearing bush serves as a system for the return spring, it is particularly advantageous for the manufacture of a valve according to the invention if, in a first method step, a valve needle consisting of valve closing member, connecting tube and armature is inserted into a connecting part of the valve. In a next method step, a valve seat body having the valve seat is inserted into a holding bore of the connecting part, and the axial play of the valve needle consisting of the preselected sum of the valve needle stroke and residual air gap is determined by the axial position of the valve seat body in the holding bore and then the valve seat body is tightly connected to the connecting part. The force of the return spring is set in a subsequent process step by pressing the bearing bush into a flow hole in the core. In a further process step, the stroke of the valve closing member is adjusted by the screwing-in or pressing-in depth of the sliding sleeve connected to the stop rod into the flow bore. This means that with this method, the force of the return spring can be adjusted independently of the screwing-in or pressing-in depth of the sliding sleeve.

Ein anderes vorteilhaftes Verfahren zur Herstellung eines erfindungsgemäßen Ventils mit einer als Anlage für die Rückstellfeder dienenden Lagerbuchse ist dadurch zu beschreiben, daß in einem ersten Verfahrensschritt zunächst die Lagerbuchse in eine Strömungsbohrung des Kerns und anschließend eine aus Ventilschließglied, Verbindungsrohr und Anker bestehende Ventilnadel in ein Verbindungsteil des Ventils eingeführt wird. Der Restluftspalt wird in einem nächsten Verfahrensschritt durch die Einschraub- oder Einpreßtiefe der mit der Anschlagstange verbundenen Verschiebehülse in die Strömungsbohrung festgelegt. In einem folgenden Verfahrensschritt wird ein den Ventilsitz aufweisender Ventilsitzkörper in eine Haltebohrung des Verbindungsteils eingeführt, wobei die axiale Positionierung des Ventilsitzkörpers zur Einstellung des Ventilnadelhubes dient, und anschließend der Ventilsitzkörper mit dem Verbindungsteil dicht verbunden. Das Einstellen der Kraft der Rückstellfeder geschieht in einem weiteren Verfahrensschritt, indem die Einpreßtiefe der Lagerbuchse in der Strömungsbohrung verändert wird.Another advantageous method for producing a valve according to the invention with a bearing bush serving as a system for the return spring can be described in that, in a first process step, the bearing bush first into a flow bore of the core and then a valve needle consisting of valve closing member, connecting pipe and armature into a connecting part of the valve is inserted. In a next process step, the residual air gap is determined by the screwing-in or press-in depth of the sliding sleeve connected to the stop rod into the flow bore. In a subsequent method step, a valve seat body having the valve seat is inserted into a holding bore of the connecting part, the axial positioning of the valve seat body serving to adjust the valve needle stroke, and then the valve seat body is tightly connected to the connecting part. The setting of the force of the return spring takes place in a further process step by changing the press-in depth of the bearing bush in the flow bore.

Zeichnungdrawing

Ausführungsbeispiele der Erfindung sind in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 ein erstes Ausführungsbeispiel eines erfindungsgemäß ausgestalteten Ventils, Figur 2 einen vergrößert dargestellten Schnitt durch die Verschiebehülse entlang der Linie II-II in Figur 1 und Figur 3 ein zweites Ausführungsbeispiel des erfindungsgemäß ausgestalteten Ventils.Embodiments of the invention are shown in simplified form in the drawing and explained in more detail in the following description. 1 shows a first embodiment of an inventive configured valve, Figure 2 shows an enlarged section through the sliding sleeve along the line II-II in Figure 1 and Figure 3 shows a second embodiment of the valve designed according to the invention.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Das in der Figur 1 beispielsweise dargestellte elektromagnetisch betätigbare Ventil in Form eines Einspritzventils für Brennstoff als Aggregat einer Brennstoffeinspritzanlage einer gemischverdichtenden fremdgezündeten Brennkraftmaschine hat einen rohrförmigen metallenen Kern 1 aus ferromagnetischem Material, auf dessen unterem Kernende 2 eine Magnetspule 3 angeordnet ist. Am oberen Ende des Kernes 1 ist ein Brennstoffeinlaßstutzen 5 ausgebildet. Anschließend an das Kernende 2 ist konzentrisch zur Ventillängsachse 4 dicht mit dem Kern 1 ein rohrförmiges Zwischenteil 6 verbunden, beispielsweise durch Verlöten oder Verschweißen. Das Zwischenteil 6 ist beispielsweise aus nichtmagnetischem Blech gefertigt, das tiefgezogen ist und koaxial zur Ventillängsachse verlaufend einen ersten Verbindungsabschnitt 60 hat, mit dem es vollständig das Kernende 2 umgreift und mit diesem dicht verbunden ist. Der Verbindungsabschnitt 60 weist an seiner inneren Bohrung dem Brennstoffeinlaßstutzen 5 abgewandt eine mit kleinerem Durchmesser versehene Gleitbohrung 67 auf, in die ein zylindrischer Anker 12 ragt und durch die der Anker 12 geführt wird. Die axiale Erstreckung der Gleitbohrung 67 ist im Vergleich zur axialen Länge des Ankers 12 gering, sie beträgt etwa 1/15 der Lange des Ankers.The electromagnetically actuated valve shown in FIG. 1, for example, in the form of an injection valve for fuel as an aggregate of a fuel injection system of a mixture-compressing spark-ignition internal combustion engine has a tubular metal core 1 made of ferromagnetic material, on the lower core end 2 of which a magnet coil 3 is arranged. At the upper end of the core 1, a fuel inlet port 5 is formed. Subsequent to the core end 2, a tubular intermediate part 6 is connected to the core 1 concentrically with the valve longitudinal axis 4, for example by soldering or welding. The intermediate part 6 is made, for example, of non-magnetic sheet metal, which is deep-drawn and has a first connecting section 60, which extends coaxially to the valve longitudinal axis and with which it completely surrounds the core end 2 and is tightly connected to it. The connecting section 60 has on its inner bore facing away from the fuel inlet connector 5 a sliding bore 67 provided with a smaller diameter, into which a cylindrical armature 12 projects and through which the armature 12 is guided. The axial extension of the sliding bore 67 is small compared to the axial length of the armature 12, it is approximately 1/15 the length of the armature.

Ein sich vom ersten Verbindungsabschnitt 60 radial nach außen erstreckender Kragen 61 führt zu einem zweiten Verbindungsabschnitt 62 des Zwischenteiles 6, der sich koaxial zur Ventillängsachse 4 verlaufend erstreckt und in axialer Richtung ein rohrförmiges zylindrisches Verbindungsteil 50 teilweise überragt und mit diesem dicht verbunden ist, beispielsweise durch Verlöten oder Verschweißen. Der Durchmesser des zweiten Verbindungsabschnittes 62 ist somit größer als der Durchmesser des ersten Verbindungsabschnittes 60, so daß im montierten Zustand das rohrförmige Verbindungsteil 50 mit einer Stirnfläche 70 am Kragen 61 anliegt. Um kleine Außenmaße des Ventils zu ermöglichen, umgreift der erste Verbindungsabschnitt 60 einen Halteabsatz 81 des Kernendes 2, der einen geringeren Außendurchmesser als der Kern 1 hat und der zweite Verbindungsabschnitt 62 umgreift einen ebenfalls mit geringerem Außendurchmesser als im angrenzenden Bereich ausgebildeten Halteabsatz 82 des Verbindungsteiles 50. Das aus ferromagnetischem Material gefertigte Verbindungsteil 50 hat der Stirnfläche 70 abgewandt eine Haltebohrung 75, in die ein Ventilsitzkörper 8 dicht eingesetzt ist, beispielsweise durch Einpressen, eine Verschraubung, Verschweißung oder Verlötung. Die Haltebohrung 75 geht in eine Übergangsbohrung 76 über, die sich bis zur Stirnfläche 70 erstreckt.A collar 61, which extends radially outward from the first connecting section 60, leads to a second connecting section 62 of the intermediate part 6, which extends coaxially to the longitudinal valve axis 4 and partially extends beyond a tubular cylindrical connecting part 50 in the axial direction and is tight with it is connected, for example by soldering or welding. The diameter of the second connecting section 62 is thus larger than the diameter of the first connecting section 60, so that in the assembled state the tubular connecting part 50 rests with an end face 70 on the collar 61. In order to enable small external dimensions of the valve, the first connecting section 60 encompasses a holding shoulder 81 of the core end 2, which has a smaller outer diameter than the core 1, and the second connecting section 62 surrounds a holding shoulder 82 of the connecting part 50, which is also formed with a smaller outer diameter than in the adjacent area The connecting part 50 made of ferromagnetic material has a holding bore 75 facing away from the end face 70, into which a valve seat body 8 is inserted in a sealed manner, for example by pressing in, screwing, welding or soldering. The holding bore 75 merges into a transition bore 76 which extends to the end face 70.

Dem Kernende 2 zugewandt weist der metallene Ventilsitzkörper 8 einen festen Ventilsitz 9 auf. Die Aneinanderreihung von Kern 1, Zwischenteil 6, Verbindungsteil 50 und Ventilsitzkörper 8 stellt eine starre metallene Einheit dar. In eine Befestigungsöffnung 13 des Ankers 12 ist ein Ende eines in die Übergangsbohrung 76 ragenden dünnwandigen runden Verbindungsrohres 36 eingesetzt sowie mit diesem verbunden. Mit dessen dem Ventilsitz 9 zugewandten anderen Ende ist ein Ventilschließglied 14 verbunden, das beispielsweise die Form einer Kugel, einer Halbkugel oder eine andere Form haben kann. Die Verbindung zwischen Verbindungsrohr 36 und Anker 12 sowie Ventilschließglied 14 und Verbindungsrohr 36 erfolgt in vorteilhafter Weise durch Verschweißen oder Verlöten.The metal valve seat body 8 has a fixed valve seat 9 facing the core end 2. The series of core 1, intermediate part 6, connecting part 50 and valve seat body 8 represents a rigid metal unit. In a fastening opening 13 of the armature 12, one end of a thin-walled round connecting tube 36 projecting into the transition bore 76 is inserted and connected to it. With its other end facing the valve seat 9, a valve closing member 14 is connected, which may have the shape of a sphere, a hemisphere or another shape, for example. The connection between the connecting tube 36 and armature 12 and the valve closing member 14 and connecting tube 36 is advantageously made by welding or soldering.

Eine in das Verbindungsrohr 36 ragende und in Öffnungsstellung des Ventils das Ventilschließglied 14 berührende Anschlagstange 40, die eine beliebige, beispielsweise kreisförmige Querschnittsform aufweist, ist mit einer Verschiebehülse 22 fest verbunden. Die Verschiebehülse 22 weist, wie in Figur 2 als Ausführungsbeispiel vergrößert dargestellt, in axialer Richtung verlaufende, radial nach innen gerichtete Einprägungen 25 auf. Diese beispielsweise drei dargestellten Einprägungen 25 bilden Berührungsflächen zwischen der Verschiebehülse 22 und der Anschlagstange 40 aus, so daß auf der einen Seite eine einfache feste Verbindung beider Teile durch Schweißen, Löten oder durch Pressen ermöglicht wird, auf der anderen Seite aber ein problemloser Brennstofffluß durch die Verschiebehül- se 22 gewährleistet ist.A stop rod 40 projecting into the connecting tube 36 and in the open position of the valve touching the valve closing member 14, which has an arbitrary, for example circular, cross-sectional shape. is firmly connected to a sliding sleeve 22. The sliding sleeve 22 has, as shown enlarged in FIG. 2 as an exemplary embodiment, axially directed, radially inwardly directed impressions 25. These three impressions 25, for example, shown form contact surfaces between the sliding sleeve 22 and the stop rod 40, so that on the one hand a simple fixed connection of the two parts is made possible by welding, soldering or pressing, but on the other hand a problem-free fuel flow through the Sliding sleeve 22 is guaranteed.

In dem von der Anschlagstange 40 in Öffnungsstellung des Ventils berührten Kontaktbereich ist die Oberfläche des Ventilschließgliedes 14 nach außen gekrümmt ausgebildet. Die Anschlagstange 40 ist aus einem nicht magnetisierbaren Material ausgeführt, ihre Oberfläche, insbesondere an ihrer dem Ventilschließglied 14 zugewandten Fläche, gehärtet.In the contact area touched by the stop rod 40 in the open position of the valve, the surface of the valve closing member 14 is curved outward. The stop rod 40 is made of a non-magnetizable material, its surface, in particular on its surface facing the valve closing member 14, is hardened.

Eine dem Ventilschließglied 14 abgewandte, in eine Strömungsbohrung 21 des Kerns 1 ragende Rückstellfeder 18 liegt an der Verschiebehülse 22 an. Das andere, in die den Anker 12 durchdringende abgestufte Befestigungsöffnung 13 ragende Ende der Rückstellfeder 18 stützt sich an einer Stirnfläche des Verbindungsrohres 36 ab. Die Einstellung der Federkraft der Rückstellfeder 18 ergibt sich durch die axiale Positionierung der in die Strömungsbohrung 21 eingeschraubten oder eingepreßten Verschiebehülse 22.A return spring 18 facing away from the valve closing member 14 and protruding into a flow bore 21 of the core 1 bears against the sliding sleeve 22. The other end of the return spring 18 projecting into the stepped fastening opening 13 penetrating the armature 12 is supported on an end face of the connecting tube 36. The setting of the spring force of the return spring 18 results from the axial positioning of the sliding sleeve 22 screwed or pressed into the flow bore 21.

Mindestens ein Teil des Kerns 1 und die Magnetspule 3 sind in ihrer gesamten axialen Länge durch eine Kunststoffummantelung 24 umschlossen, die auch wenigstens einen Teil des Zwischenteils 6 und des Verbindungsrohres 36 umschließt. Die Kunststoffummantelung 24 kann durch Ausgießen oder Umspritzen mit Kunststoff erzielt werden. An der Kunststoffummantelung 24 ist zugleich ein elektrischer Anschlußstecker 26 angeformt, über den die elektrische Kontaktierung der Magnetspule 3 und damit deren Erregung erfolgt.At least a part of the core 1 and the magnet coil 3 are enclosed in their entire axial length by a plastic sheath 24, which also encloses at least a part of the intermediate part 6 and the connecting tube 36. The plastic jacket 24 can be achieved by pouring or extrusion coating with plastic. At the plastic sheath 24 is an electrical connector 26 integrally formed, via which the electrical contact of the solenoid 3 and thus the excitation takes place.

Die Magnetspule 3 ist von wenigstens einem als ferromagnetisches Element zur Führung der Magnetfeldlinien dienenden Leitelement 28 umgeben, das aus ferromagnetischem Material hergestellt ist und sich in axialer Richtung über die gesamte Länge der Magnetspule 3 erstreckt und die Magnetspule 3 in Umfangsrichtung wenigstens teilweise umgibt.The magnet coil 3 is surrounded by at least one guide element 28 serving as a ferromagnetic element for guiding the magnetic field lines, which is made of ferromagnetic material and extends in the axial direction over the entire length of the magnet coil 3 and at least partially surrounds the magnet coil 3 in the circumferential direction.

Das Leitelement 28 ist in Form eines Bügels ausgebildet, mit einem an die Kontur der Magnetspule angepaßten Bereich 29, der nur teilweise in Umfangsrichtung die Magnetspule 3 umgibt und einem sich in radialer Richtung nach innen erstreckenden Endabschnitt 31, der den Kern 1 teilweise umgreift. In Figur 1 ist ein Ventil mit einem Leitelement 28 dargestellt.The guide element 28 is designed in the form of a bracket, with an area 29 which is adapted to the contour of the magnetic coil and which only partially surrounds the magnetic coil 3 in the circumferential direction, and an end portion 31 which extends inwards in the radial direction and which partially encompasses the core 1. 1 shows a valve with a guide element 28.

Der Brennstoff strömt vom Brennstoffeinlaßstutzen 5 durch den Anker 12 in einen Innenkanal 38 des Verbindungsrohres 36 sowie über radiale Durchgangsöffnungen 37 in die Übergangsbohrung 76 und von dort zum Ventilsitz 9, stromabwärts dessen im Ventilsitzkörper 8 wenigstens eine Abspritzöffnung 17 ausgebildet ist, über die der Brennstoff in ein Saugrohr oder einen Zylinder einer Brennkraftmaschine abgespritzt wird.The fuel flows from the fuel inlet nozzle 5 through the armature 12 into an inner channel 38 of the connecting tube 36 and via radial through openings 37 into the transition bore 76 and from there to the valve seat 9, downstream of which at least one spray opening 17 is formed in the valve seat body 8, via which the fuel is formed in an intake manifold or a cylinder of an internal combustion engine is hosed down.

Sind zwei oder mehr Leitelemente 28 vorgesehen, so kann es auch aus räumlichen Gründen zweckmäßig sein, den elektrischen Anschlußstecker 26 in einer Ebene verlaufen zu lassen, die um 90° verdreht ist, also senkrecht auf der hier dargestellten Ebene steht.If two or more guide elements 28 are provided, it may also be expedient for spatial reasons to let the electrical connector plug 26 run in a plane that is rotated by 90 °, that is to say perpendicular to the plane shown here.

In Figur 3 ist ein zweites Ausführungsbeispiel der Erfindung dargestellt, bei dem die gleichen und gleichwirkenden Teile durch im wesentlichen die gleichen Bezugszeichen gekennzeichnet sind wie bei den Figuren 1 und 2. Ein Ventilschließglied 44 weist in dem in Öffnungsstellung des Ventils durch eine Anschlagstange 45 berührten Bereich eine ebene Oberfläche 48 auf. Demgebenüber ist die Oberfläche der Anschlagstange 45 an ihrer dem Ventilschließglied 44 zugewandten Stirnseite nach außen gekrümmt ausgeführt.In Figure 3, a second embodiment of the invention is shown, in which the same and equivalent parts are identified by substantially the same reference numerals as in 1 and 2. A valve closing member 44 has a flat surface 48 in the region touched by a stop rod 45 in the open position of the valve. In addition, the surface of the stop rod 45 is curved outwards on its end face facing the valve closing member 44.

Als Anlage für die Rückstellfeder 18, die mittels des Verbindungsrohres 36 auf das Ventilschließglied 44 wirkt, dient eine in die Stromungsbohrung 21 des Kerns 1 zwischen Verschiebehülse 22 und Rückstellfeder 18 eingepreßte Lagerbuchse 46. In axialer Richtung weist die Lagerbuchse 46 eine konzentrisch zu der Ventillängsachse 4 ausgebildete Öffnung für die Anschlagstange 45 sowie zumindest eine Strömungsöffnung 47 auf, die dem Brennstofffluß durch die Lagerbuchse 46 dient.A bearing bush 46 which is pressed into the flow bore 21 of the core 1 between the displacement sleeve 22 and the restoring spring 18 serves as a system for the return spring 18, which acts on the valve closing member 44 by means of the connecting tube 36. In the axial direction, the bearing bush 46 has a concentric with the valve longitudinal axis 4 trained opening for the stop rod 45 and at least one flow opening 47, which serves the fuel flow through the bearing bush 46.

Bei der Montage des erfindungsgemäßen Ventils muß die Größe des Restluftspaltes und des die abgespritzte Brennstoffmenge beeinflussenden Hubes des Ventilschließgliedes 14 möglichst einfach und exakt eingestellt werden. Aus diesem Grund ist es vorteilhaft, in einem ersten Verfahrensschritt eine aus Ventilschließglied 14, Verbindungsrohr 36 und Anker 12 bestehende Ventilnadel in das mit dem Zwischenteil 6 und dem Kern 1 verbundene Verbindungsteil 50 einzuführen und in einem nächsten Verfahrensschritt den Ventilsitzkörper 8 in die Haltebohrung 75 einzuführen und das aus der vorgewählten Summe von Ventilnadelhub und Restluftspalt bestehende Axialspiel der Ventilnadel durch die axiale Position des Ventilsitzkörpers 8 in der Haltebohrung 75 festzulegen. Danach wird der Ventilsitzkörper 8 mit dem Verbindungsteil 50 dicht verbunden. Die Einstellung des Hubes des Ventilschließgliedes 14 und der Kraft der Rückstellfeder 18 erfolgt in einem folgenden Verfahrensschritt durch die Einschraub- oder Einpreßtiefe der mit der Anschlagstange 40 verbundenen Verschiebehülse 22 in die Stromungsbohrung 21.When assembling the valve according to the invention, the size of the residual air gap and the stroke of the valve closing member 14 influencing the amount of fuel sprayed off must be set as simply and precisely as possible. For this reason, it is advantageous in a first method step to insert a valve needle consisting of valve closing member 14, connecting tube 36 and armature 12 into the connecting part 50 connected to the intermediate part 6 and the core 1 and in a next method step to insert the valve seat body 8 into the holding bore 75 and to determine the axial play of the valve needle consisting of the preselected sum of the valve needle stroke and residual air gap by the axial position of the valve seat body 8 in the holding bore 75. Thereafter, the valve seat body 8 is tightly connected to the connecting part 50. The stroke of the valve closing member 14 and the force of the return spring 18 are adjusted in a subsequent process step by the screwing-in or pressing-in depth of the displacement sleeve 22 connected to the stop rod 40 into the flow bore 21.

Ein anderes zur genauen und einfachen Einstellung des Restluftspaltes, des Ventilnadelhubes und der Kraft der Rückstellfeder 18 eines erfindungsgemäß ausgestalteten Ventils vorteilhaftes Verfahren besteht darin, in einem ersten Verfahrensschritt eine aus Ventilschließglied 14, Verbindungsrohr 36 und Anker 12 bestehende Ventilnadel in das mit dem Zwischenteil 6 und dem Kern 1 verbundene Verbindungsteil 50 einzuführen und in einem nächsten Verfahrensschritt den Restluftspalt durch die Einschraub- oder Einpreßtiefe der mit der Anschlagstange 40 verbundenen Verschiebehülse 22 in die Strömungsbohrung 21 festzulegen. In einem folgenden Verfahrensschritt wird der Ventilsitzkorper 8 zunächst in die Haltebohrung 75 eingeführt, wobei die axiale Positionierung des Ventilsitzkörpers 8 zur Einstellung des Ventilnadelhubes und damit auch der abgespritzten Brennstoffmenge sowie der Kraft der Rückstellfeder 18 dient. Anschließend wird der Ventilsitzkorper 8 mit dem Verbindungsteil 50 dicht verbunden.Another method which is advantageous for the precise and simple setting of the residual air gap, the valve needle stroke and the force of the return spring 18 of a valve designed according to the invention is, in a first method step, to insert a valve needle consisting of valve closing member 14, connecting tube 36 and armature 12 into the one with the intermediate part 6 and insert the connecting part 50 connected to the core 1 and, in a next process step, fix the residual air gap into the flow bore 21 by the screwing-in or pressing-in depth of the sliding sleeve 22 connected to the stop rod 40. In a subsequent process step, the valve seat body 8 is first inserted into the holding bore 75, the axial positioning of the valve seat body 8 serving to adjust the valve needle stroke and thus also the amount of fuel sprayed off and the force of the return spring 18. The valve seat body 8 is then tightly connected to the connecting part 50.

Dient, wie in der Figur 3 dargestellt, die Lagerbuchse 46 als Anlage für die Rückstellfeder 18, so ist es für die Montage des erfindungsgemaßen Ventils vorteilhaft, in einem ersten Verfahrensschritt eine aus Ventilschließglied 44, Verbindungsrohr 36 und Anker 12 bestehende Ventilnadel in das mit dem Zwischenteil 6 und dem Kern 1 verbundene Verbindungsteil 50 einzuführen und in einem nächsten Verfahrensschritt den Ventilsitzkörper 8 in die Haltebohrung 75 einzufüh- ren und das aus der vorgewählten Summe von Ventilnadelhub und Restluftspalt bestehende Axialspiel der Ventilnadel durch die axiale Position des Ventilsitzkörpers 8 in der Haltebohrung 75 festzulegen.If, as shown in FIG. 3, the bearing bush 46 serves as a system for the return spring 18, it is advantageous for the assembly of the valve according to the invention, in a first process step, to insert a valve needle consisting of valve closing member 44, connecting tube 36 and armature 12 into the valve needle Introduce the connecting part 50 connected between the intermediate part 6 and the core 1 and, in a next method step, insert the valve seat body 8 into the holding bore 75 and the axial play of the valve needle consisting of the preselected sum of the valve needle stroke and residual air gap due to the axial position of the valve seat body 8 in the holding bore 75 to be determined.

Danach wird der Ventilsitzkorper 8 mit dem Verbindungsteil 50 dicht verbunden. In einem folgenden Verfahrensschritt wird die Kraft der Rückstellfeder 18 eingestellt, indem die Lagerbuchse 46 in die Strömungsbohrung 21 des Kerns 1 eingepreßt wird. Die Einstellung des Hubes des Ventilschließgliedes 44 erfolgt in einem weiteren Verfahrensschritt durch die Einschraub- oder Einpreßtiefe der mit der Anschlagstange 45 verbundenen Verschiebehülse 22 in die Strömungsboh- rung 21.Thereafter, the valve seat body 8 is tightly connected to the connecting part 50. In a subsequent process step, the force of the return spring 18 is set by pressing the bearing bush 46 into the flow bore 21 of the core 1. The setting of the stroke of the valve closing member 44 is carried out in a further process step by the screwing-in or pressing-in depth of the stop rod 45 connected sliding sleeve 22 into the flow bore 21.

Ein anderes vorteilhaftes Verfahren zur Herstellung eines erfindungsgemäßen Ventils bei Verwendung einer als Anlage für die Rückstellfeder 18 dienenden Lagerbuchse 46, wie in Figur 3 dargestellt, besteht darin, in einem ersten Verfahrensschritt zunächst die Lagerbuchse 46 in die Strömungsbohrung 21 und anschließend eine aus Ventilschließglied 44, Verbindungsrohr 36 und Anker 12 bestehende Ventilnadel in das mit dem Zwischenteil 6 und dem Kern 1 verbundene Verbindungsteil 50 einzuführen. In einem nächsten Verfahrensschritt wird der Restluftspalt durch die Einschraub- oder Einpreßtiefe der mit der Anschlagstange 45 verbundenen Verschiebehülse 22 in die Strömungsbohrung 21 festgelegt. In einem folgenden Verfahrensschritt wird der Ventilsitzkörper 8 zunächst in die Haltebohrung 75 eingeführt, wobei die axiale Positionierung des Ventilsitzkörpers 8 zur Einstellung des Ventilnadelhubes und damit auch der abgespritzten Brennstoffmenge dient. Anschließend wird der Ventilsitzkörper 8 mit dem Verbindungsteil 50 dicht verbunden. Das Einstellen der Kraft der Rückstellfeder 18 erfolgt in einem weiteren Verfahrensschritt, indem die Einpreßtiefe der Lagerbuchse 46 in die Strömungsbohrung 21 verändert wird.Another advantageous method for producing a valve according to the invention when using a bearing bush 46 serving as a system for the return spring 18, as shown in FIG. 3, consists in a first step of the process first of all the bearing bush 46 in the flow bore 21 and then a valve closure member 44, Insert the connecting tube 36 and armature 12 existing valve needle into the connecting part 50 connected to the intermediate part 6 and the core 1. In a next process step, the residual air gap is determined by the screwing-in or press-in depth of the sliding sleeve 22 connected to the stop rod 45 into the flow bore 21. In a subsequent method step, the valve seat body 8 is first inserted into the holding bore 75, the axial positioning of the valve seat body 8 serving to adjust the valve needle stroke and thus also the amount of fuel sprayed off. The valve seat body 8 is then tightly connected to the connecting part 50. The setting of the force of the return spring 18 takes place in a further method step by changing the pressing-in depth of the bearing bush 46 into the flow bore 21.

Die zentrale Anschlagstange 40 bzw. 45 des erfindungsgemäßen Ventils erlaubt unabhängig von der Schiefstellung der Ventilnadel einen konstanten Öffnungshub des Ventilschließgliedes 14 bzw. 44 und damit die Zuteilung einer exakt dosierten Brennstoffmenge. In Verbindung mit der Positionierung des Ventilsitzkörpers 8 in der Haltebohrung 75 ermöglicht die mit der Anschlagstange 40 bzw. 45 verbundene Verschiebehülse 22 bei der Montage in die Strömungsbohrung 21 eine einfache und genaue Einstellung des Restluftspaltes und des Hubes des Ventilschließgliedes 14 bzw. 44.The central stop rod 40 or 45 of the valve according to the invention allows a constant opening stroke of the valve closing member 14 or 44 and thus the allocation of an exactly metered amount of fuel, regardless of the inclination of the valve needle. In connection with the positioning of the valve seat body 8 in the holding bore 75, the sliding sleeve 22 connected to the stop rod 40 or 45 enables simple and precise adjustment of the residual air gap and the stroke of the valve closing member 14 or 44 when installed in the flow bore 21.

Claims (10)

  1. Electromagnetically actuable valve, especially fuel-injection valve for fuel-injection systems of mixture-compressing spark-ignition internal-combustion engines, with a tubular core (1) which is surrounded by a magnet coil (3), the upper end of which is designed as a fuel-inlet connection piece (5), with an armature (12) facing the core (1) and with a connecting tube (36) arranged concentrically to a longitudinal axis (4) of the valve and having a tube wall which is connected at its one end to the armature (12) and at its other end to a valve-closing member (14) cooperating with a fixed valve seat (9), as well as with a stop device limiting the opening travel of the valve-closing member (14), characterised in that the stop device is designed as a stop rod (40, 45) which is arranged concentrically to the longitudinal axis of the valve, projects into the connecting tube (36) and touches the valve-closing member (14, 44) in the opening position of the valve and which is connected to a displacement sleeve (22) mounted displaceably in the core (1) and having passage orifices for the fuel.
  2. Valve according to Claim 1, characterised in that the valve-closing member (14) has a convexly designed surface in the region touched by the stop rod (40, 45) in the opening position of the valve.
  3. Valve according to Claim 1, characterised in that the stop rod (40, 45) has a convexly designed surface on its end face confronting the valve-closing member (14, 44).
  4. Valve according to Claim 1, characterised in that the displacement sleeve (22) has axially extending indentations (25) which point radially inwards.
  5. Valve according to Claim 1 or 4, characterised in that the displacement sleeve (22) serves as bearing means for a return spring (18) acting on the valve-closing member (14).
  6. Valve according to Claim 1 or 4, characterised in that a bearing bush (46), which is pressed into the core (1) downstream of the displacement sleeve (22) and which has orifices for the stop rod (45) and fuel in the direction of flow, serves as bearing means for the return spring (18) acting on the valve-closing member (44).
  7. Process for producing an electromagnetically actuable valve according to at least one of Claims 1 to 6, characterised in that, in a first process step, a valve needle, consisting of valve-closing member (14), connecting tube (36) and armature (12), is introduced into a connection part (50) of the valve, in that, in a subsequent process step, a valve-seat body (8) having the valve seat (9) is introduced in alignment with the valve-closing member (14) into a holding bore (75) of the connection part (50), and the axial play of the valve needle, consisting of the preselected sum of valve-needle stroke and residual-air gap, is fixed by the axial position of the valve-seat body (8) in the holding bore (75), in that the valve-seat body (8) is connected sealingly to the connection part (50), and in that, in a following process step, the setting of the stroke of the valve-closing member (14) and of the force of the return spring (18) takes place by means of the screw-in or press-in depth of the displacement sleeve (22), connected to the stop rod (40), into a flow bore (21) of the core (1).
  8. Process for producing an electromagnetically actuable valve according to at least one of Claims 1 to 6, characterised in that, in a first process step, a valve needle, consisting of valve-closing member (14), connecting tube (36) and armature (12), is introduced into a connection part (50) of the valve, in that, in a subsequent process step, the residual-air gap is fixed by means of the screw-in or press-in depth of the displace- ment sleeve (22), connected to the stop rod (40), in a flow bore (21) of the core (1), in that, in a following process step, a valve-seat body (8) having the valve seat (9) is introduced in alignment with the valve-closing member (14) into a holding bore (75) of the connection part (50), the axial positioning of the valve-seat body (8) serving for setting the valve-needle stroke and therefore also the injected fuel quantity and the force of the return spring (18), and in that the valve-seat body (8) is connected sealingly to the connection part (50) in a concluding process step.
  9. Process for producing an electromagnetically actuable valve according to Claim 6, characterised in that, in a first process step, a valve needle, consisting of valve-closing member (44), connecting tube (36) and armature (12), is introduced into a connection part (50) of the valve, in that, in a subsequent process step, a valve-seat body (8) having the valve seat (9) is introduced in alignment with the valve-closing member (14) into a holding bore (75) of the connection part (50), the axial play of the valve needle, consisting of the pre-selected sum of valve-needle stroke and residual-air gap, is fixed by the axial position of the valve-seat body (8) in the holding bore (75), and the valve-seat body (8) is thereafter connected sealingly to the connection part (50), in that, in a following process step, the force of the return spring (18) is set by pressing the bearing bush (46) into a flow bore (21) of the core (1), and in that the setting of the stroke of the valve-closing member (44) takes place in a further process step by means of the screw-in or press-in depth of the displacement sleeve (22), connected to the stop rod (45), into the flow bore (21).
  10. Process for producing an electromagnetically actuable valve according to Claim 6, characterised in that, in a first process step, the bearing bush (46) is first introduced into a flow bore (21) of the core (1), and subsequently a valve needle, consisting of valve-closing member (44), connecting tube (36) and armature (12), is introduced into a connection part (50) of the valve, in that, in a subsequent process step, the residual-air gap is fixed by means of the screw-in or press-in depth of the displacement sleeve (22), connected to the stop rod (45), into the flow bore (21), in that, in a following process step, a valve-seat body (8) having the valve seat (9) is introduced in alignment with the valve-closing member (14) into a holding bore (75) of the connection part (50), the axial positioning of the valve-seat body (8) serving for setting the valve-needle stroke, in that the valve-seat body (8) is thereafter connected sealingly to the connection part (50), and in that the setting of the force of the return spring (18) takes place in a further process step by varying the press-in depth of the bearing bush (46) into the flow bore (21).
EP90916030A 1989-12-21 1990-11-10 Electromagnetically actuated valve Expired - Lifetime EP0460125B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3942306A DE3942306A1 (en) 1989-12-21 1989-12-21 ELECTROMAGNETICALLY ACTUABLE VALVE
DE3942306 1989-12-21

Publications (2)

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EP0460125A1 EP0460125A1 (en) 1991-12-11
EP0460125B1 true EP0460125B1 (en) 1993-11-03

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EP90916030A Expired - Lifetime EP0460125B1 (en) 1989-12-21 1990-11-10 Electromagnetically actuated valve

Country Status (8)

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US (1) US5143301A (en)
EP (1) EP0460125B1 (en)
JP (1) JP2839709B2 (en)
KR (1) KR100187996B1 (en)
BR (1) BR9007144A (en)
DE (2) DE3942306A1 (en)
ES (1) ES2046798T3 (en)
WO (1) WO1991010061A1 (en)

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US5651501A (en) * 1993-12-23 1997-07-29 Caterpillar Inc. Fluid damping of a valve assembly
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JPH0893947A (en) * 1994-09-28 1996-04-12 Aisin Seiki Co Ltd Solenoid valve device and manufacture thereof
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GB0102500D0 (en) * 2001-02-01 2001-03-14 Delphi Tech Inc Method of assembling an actuator arrangement
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Also Published As

Publication number Publication date
WO1991010061A1 (en) 1991-07-11
DE59003365D1 (en) 1993-12-09
JP2839709B2 (en) 1998-12-16
BR9007144A (en) 1992-02-18
US5143301A (en) 1992-09-01
ES2046798T3 (en) 1994-02-01
DE3942306A1 (en) 1991-06-27
EP0460125A1 (en) 1991-12-11
KR100187996B1 (en) 1999-06-01
KR920701660A (en) 1992-08-12

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