EP3365551B1 - Electromagnetically operable inlet valve and high-pressure pump having an inlet valve - Google Patents

Electromagnetically operable inlet valve and high-pressure pump having an inlet valve Download PDF

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Publication number
EP3365551B1
EP3365551B1 EP16763548.1A EP16763548A EP3365551B1 EP 3365551 B1 EP3365551 B1 EP 3365551B1 EP 16763548 A EP16763548 A EP 16763548A EP 3365551 B1 EP3365551 B1 EP 3365551B1
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EP
European Patent Office
Prior art keywords
magnet
inlet valve
armature
magnetic core
pump
Prior art date
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Application number
EP16763548.1A
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German (de)
French (fr)
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EP3365551A1 (en
Inventor
Stefan Kolb
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP3365551A1 publication Critical patent/EP3365551A1/en
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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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46—Valves
    • F02M59/466—Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
    • F02M59/366—Valves being actuated electrically
    • F02M59/368—Pump inlet valves being closed when actuated
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/02—Fuel-injection apparatus having means for reducing wear

Definitions

  • the invention relates to an electromagnetically operable inlet valve for a high pressure pump, in particular a fuel injection system, according to the preamble of claim 1. Furthermore, the invention relates to a high pressure pump with such an inlet valve.
  • An electromagnetically actuated intake valve for a high-pressure pump of a fuel injection system is characterized by the DE 10 2013 220 593 A1 known.
  • the high-pressure pump has at least one pump element with a pump piston driven in a stroke movement, which delimits a pump working space.
  • the pump working space can be connected to an inlet for the fuel via the inlet valve.
  • the inlet valve comprises a valve member which cooperates with a valve seat for control and which is movable between an open position and a closed position. In its closed position, the valve member comes to rest against the valve seat.
  • the inlet valve comprises an electromagnetic actuator, through which the valve member is movable.
  • the electromagnetic actuator has an armature acting at least indirectly on the valve member, a magnetic coil surrounding the magnet armature and a magnetic core.
  • the magnet armature is displaceably guided in a carrier element, wherein the carrier element and the magnetic core are connected to one another.
  • the solenoid When the solenoid is energized, the armature is movable against the force of a return spring and comes at least indirectly on the magnetic core to the plant.
  • a spacer made of non-magnetic material may be arranged to ensure a residual air gap and to magnetically bond the armature to the magnetic core avoid.
  • a fuel injector which has an electromagnetically actuable control valve.
  • the control valve has an electromagnetic actuator, which in turn has a magnetic armature, a magnetic coil and a magnetic core.
  • the magnetic core is arranged together with a hydraulic connection part in a sleeve-shaped housing body.
  • the magnetic core is provided with a coating of elastic material, by which a seal between the magnetic core and the connection part is ensured. The coating can also cause a damping between the magnetic core and the connecting part when striking the armature on the magnetic core.
  • a fuel injection valve which has an electromagnetically actuable control valve.
  • the control valve has an electromagnetic actuator, which in turn has a magnetic armature, a magnetic coil and a magnetic core.
  • the magnetic core is arranged together with the magnetic coil in a housing body.
  • these are encapsulated in a synthetic resin material, wherein the entire space between the magnetic core and the magnetic coil and the housing body is filled with the synthetic resin material.
  • a large amount of material is required and an expensive process for introducing the synthetic resin material required.
  • the inlet valve according to the invention with the features of claim 1 has the advantage that a secure support of the magnetic core is achieved by the intermediate layer consisting of adhesive, which hardens after introduction of the magnetic core, and thereby the load on the connection between the support member and the magnetic core Striking the armature can be relieved.
  • the arrangement of the intermediate layer only on the side facing away from the magnet armature of the magnetic core only a small amount of material is required.
  • FIG. 1 a schematic longitudinal section through a high-pressure pump
  • FIG. 2 in an enlarged view a in FIG. 1 labeled II section with the inlet valve of the high-pressure pump
  • FIG. 3 one in FIG. 2 With III designated section in a further enlarged view according to an embodiment.
  • FIG. 1 is a fragmentary illustrated a high-pressure pump, which is provided for fuel delivery in a fuel injection system of an internal combustion engine.
  • the high-pressure pump has at least one pump element 10, which in turn has a pump piston 12 which is driven by a drive in a lifting movement, is guided in a cylinder bore 14 of a housing part 16 of the high-pressure pump and limits a pump working chamber 18 in the cylinder bore 14.
  • a drive shaft 20 may be provided with a cam 22 or eccentric on which the pump piston 12 directly or via a plunger, for example a Roller tappet, supports.
  • the pump working chamber 18 can be connected to a fuel inlet 26 via an inlet valve 24 and via an outlet valve 28 to a reservoir 30.
  • the pump working chamber 18 can be filled with fuel when the inlet valve 24 is open.
  • the delivery stroke of the pump piston 12 is displaced by this fuel from the pump working chamber 18 and conveyed into the memory 30.
  • the inlet valve 24 has a piston-shaped valve member 34 which has a shaft 36 displaceably guided in the through-bore 32 and a head 38 which is larger in diameter than the shaft 36 and which is arranged in the pump working space 18.
  • a valve seat 40 is formed on the housing part 16, with which the valve member 34 cooperates with a formed on its head 38 sealing surface 42.
  • the through hole 32 has a larger diameter than in the shaft 36 of the valve member 34 leading section, so that the shaft 36 of the valve member 34 surrounding annular space 44 is formed.
  • the annular space 44 open one or more inlet bores 46, on the other hand open on the outside of the housing part 16.
  • valve member 34 protrudes on the pump working chamber 18 side facing away from the housing part 16 out of the through hole 32 and on this a support member 48 is attached.
  • a valve spring 50 is supported, which on the other hand is supported on a portion 52 of the housing part 16 surrounding the shaft 36 of the valve member 34.
  • the valve spring 50 is formed for example as a helical compression spring.
  • the inlet valve 24 is actuated by an electromagnetic actuator 60, which in particular in FIG. 2 is shown.
  • the actuator 60 is controlled by an electronic control device 62 as a function of operating parameters of the internal combustion engine to be supplied.
  • the electromagnetic actuator 60 has a magnetic coil 64, a magnetic core 66 and a magnet armature 68.
  • the electromagnetic actuator 60 is arranged on the pump working chamber 18 side facing away from the inlet valve 24.
  • the magnetic core 66 and the magnetic coil 64 are arranged in a housing body 70 which can be fastened to the housing part 16 of the high-pressure pump.
  • the housing body 70 can be fastened to the housing part 16, for example, by means of a screw ring 72 which overlaps it and which is screwed onto a collar 74 of the housing part 16 provided with an external thread.
  • the armature 68 is at least substantially cylindrical in shape and slidably guided over its outer jacket in a bore 76 in a carrier element 78 arranged in the housing body 70.
  • the bore 76 in the support member 78 extends at least approximately coaxially to the through hole 32 in the housing part 16 and thus to the valve member 34.
  • the support member 78 has in its the housing part 16 opposite end portion 79 has a cylindrical outer shape.
  • the magnetic core 66 is arranged in the housing body 70 on the side facing away from the housing part 16 of the support member 78 and has a cylindrical outer shape.
  • the armature 68 has an at least approximately coaxial with the longitudinal axis 69 of the magnet armature 68 disposed central bore 80 into which a on the valve member 34 remote from the armature 68 disposed return spring 82 projects, which is supported on the armature 68.
  • the return spring 82 is supported at its other end at least indirectly on the magnetic core 66 having a central bore 84 into which the return spring 82 protrudes.
  • a support member 85 may be inserted for the return spring 82, for example, be pressed.
  • an intermediate element 86 is inserted, which may be formed as an anchor bolt.
  • the anchor bolt 86 is preferably pressed into the bore 80 of the magnet armature 68.
  • the return spring 80 may also be supported in the bore 80 on the anchor bolt 86.
  • the magnet armature 68 may have one or more passage openings 67.
  • annular shoulder 88 is formed by a reduction in diameter between the armature 68 and the inlet valve 24, by which the movement of the armature 68 is limited to the inlet valve 24 out. If the housing body 70 is not yet attached to the housing part 16 of the high pressure pump, the armature 68 is secured by the annular shoulder 88 against falling out of the bore 76. Between the annular shoulder 88 and the magnet armature 68, a disc 89 may be arranged.
  • the carrier element 78 and the magnetic core 66 are connected to one another by means of a sleeve-shaped connecting element 90.
  • the connecting element 90 is arranged with its one axial end portion 90a on the cylindrical portion 79 of the support member 78 and connected thereto and arranged with its other axial end portion 90b on the cylindrical magnetic core 66 and connected thereto.
  • the connecting element 90 is, for example, materially connected to the carrier element 78 and the magnetic core 66, in particular welded.
  • the connecting element 90 is connected neither to the carrier element 78 nor to the magnetic core 66 and bridges an axial distance between the carrier element 78 and the magnetic core 66.
  • the housing body 70 is preferably made of plastic, for example in an injection molding process.
  • the magnetic coil 64 and optionally further parts of the electromagnetic actuator 60 are encapsulated by the plastic material of the housing body 70.
  • the magnetic core 66 together with the carrier element 78 forms a preassembled module, which is used after the production of the housing body 70 in this.
  • the magnetic core 66 in this case enters into a surrounding recess 94 in the housing body 70 on its circumference.
  • the recess 94 is limited on its side facing away from the carrier element 78 by a wall 95 of the housing body 70.
  • the magnetic core 66 at least on its side facing away from the magnet armature 68 via an intermediate layer 96 on the housing body 70, in particular on the wall 95 is supported.
  • the intermediate layer 96 is applied before the introduction of the magnetic core 66 on the housing body 70 and / or on the magnetic core 66 and partially displaced during the introduction of the magnetic core 66 into the housing body 70.
  • the intermediate layer 96 consists of an adhesive which is plastically deformable during the introduction of the magnetic core 66 into the housing body 70.
  • the adhesive is partially displaced by the magnetic core 66, so that it is ensured that a space present between the end face of the magnetic core 66 and the wall 95 is completely filled with adhesive.
  • the adhesive hardens, so that the magnetic core 66 is supported on the wall 95 of the housing body 70 via the intermediate layer 96 of adhesive.
  • the load of the connection by means of the connecting element 92 between the support member 78 and the magnetic core 66 when striking the armature 68 at least indirectly on the magnetic core 66th decreases, since a portion of the forces occurring from the magnetic core 66 via the intermediate layer 96 is received by the housing body 70.
  • the inlet valve 24 is opened by the valve member 34 is in its open position, in which this is arranged with its sealing surface 42 away from the valve seat 40.
  • the movement of the valve member 34 in its open position is effected by the prevailing between the fuel inlet 26 and the pump working chamber 18 pressure difference against the force of the valve spring 50.
  • the magnetic coil 64 of the actuator 60 may be energized or de-energized. When the solenoid 64 is energized, the armature 68 is pulled by the resulting magnetic field against the force of the return spring 80 to the magnetic core 66 out.
  • the armature 68 When the solenoid 64 is deenergized, the armature 68 is urged toward the inlet valve 24 by the force of the return spring 82. The magnet armature 68 abuts over the anchor bolt 86 on the end face of the shaft 36 of the valve member 34.
  • valve member 34 of the inlet valve 24 is in its open position or closed position.
  • the armature 68 is pressed by the return spring 82 in the direction of arrow B in Figure 2, wherein the valve member 34 is pressed by the armature 68 against the valve spring 50 in the direction of adjustment B in its open position.
  • the force of the force acting on the armature 68 return spring 82 is greater than the force of the valve member 34 acting on the valve spring 50.
  • the armature 68 acts on the valve member 34 and the armature 68 and the valve member 34 are together in the direction of adjustment B emotional.
  • the solenoid coil 64 is not energized can thus be promoted by the pump piston 12 no fuel in the memory 30 but displaced by the pump piston 12 fuel is fed back into the fuel inlet 26. If during the delivery stroke of the pump piston 12 fuel is to be conveyed into the reservoir 30, the magnetic coil 64 is energized, so that the armature 68 toward the magnetic core 66 in a direction opposite to the direction of adjustment B direction of arrow A in FIG. 2 is pulled.
  • the armature 68 thus no longer exerts force on the valve member 34, wherein the magnet armature 68 is moved by the magnetic field in the direction A and the valve member 34 independent of the armature 68 due to the valve spring 50 and between the pump working chamber 18 and the fuel inlet 26 prevailing pressure difference in the direction of adjustment A is moved to its closed position.
  • the delivery rate of the high-pressure pump can be set variably in the memory 30.
  • the intake valve 34 is kept open by the actuator 60 during a large part of the delivery stroke of the pump piston 12, and if a large fuel delivery amount is required, the intake valve 34 becomes only for a small part or not at all during the delivery stroke the pump piston 12 is kept open.

Description

Die Erfindung betrifft ein elektromagnetisch betätigbares Einlassventil für eine Hochdruckpumpe, insbesondere eines Kraftstoffeinspritzsystems, gemäß dem Oberbegriff des Anspruchs 1. Ferner betrifft die Erfindung eine Hochdruckpumpe mit einem solchen Einlassventil.The invention relates to an electromagnetically operable inlet valve for a high pressure pump, in particular a fuel injection system, according to the preamble of claim 1. Furthermore, the invention relates to a high pressure pump with such an inlet valve.

Stand der TechnikState of the art

Ein elektromagnetisch betätigbares Einlassventil für eine Hochdruckpumpe eines Kraftstoffeinspritzsystems, ist durch die DE 10 2013 220 593 A1 bekannt. Die Hochdruckpumpe weist wenigstens ein Pumpenelement auf mit einem in einer Hubbewegung angetriebenen Pumpenkolben, der einen Pumpenarbeitsraum begrenzt. Der Pumpenarbeitsraum ist über das Einlassventil mit einem Zulauf für den Kraftstoff verbindbar. Das Einlassventil umfasst ein Ventilglied, das mit einem Ventilsitz zur Steuerung zusammenwirkt und das zwischen einer Öffnungsstellung und einer Schließstellung bewegbar ist. In seiner Schließstellung kommt das Ventilglied am Ventilsitz zur Anlage. Ferner umfasst das Einlassventil einen elektromagnetischen Aktor, durch den das Ventilglied bewegbar ist. Der elektromagnetische Aktor weist einen zumindest mittelbar auf das Ventilglied wirkenden Magnetanker, eine den Magnetanker umgebende Magnetspule und einen Magnetkern auf. Der Magnetanker ist in einem Trägerelement verschiebbar geführt, wobei das Trägerelement und der Magnetkern miteinander verbunden sind. Bei Bestromung der Magnetspule ist der Magnetanker gegen die Kraft einer Rückstellfeder bewegbar und kommt zumindest mittelbar am Magnetkern zur Anlage. Zwischen dem Magnetanker und dem Magnetkern kann ein Abstandselement aus nichtmagnetischem Material angeordnet sein, um einen Restluftspalt sicherzustellen und ein magnetisches Kleben des Magnetankers am Magnetkern zu vermeiden. Beim Anschlagen des Magnetankers am Magnetkern kann es zu hohen Belastungen dieser beiden Bauteile sowie der Verbindung zwischen dem Trägerelement und dem Magnetkern kommen, was über eine längere Betriebsdauer zu Beschädigungen der dieser Bauteile führen kann, wodurch die Funktionsfähigkeit des Einlassventils beeinträchtigt werden kann.An electromagnetically actuated intake valve for a high-pressure pump of a fuel injection system, is characterized by the DE 10 2013 220 593 A1 known. The high-pressure pump has at least one pump element with a pump piston driven in a stroke movement, which delimits a pump working space. The pump working space can be connected to an inlet for the fuel via the inlet valve. The inlet valve comprises a valve member which cooperates with a valve seat for control and which is movable between an open position and a closed position. In its closed position, the valve member comes to rest against the valve seat. Furthermore, the inlet valve comprises an electromagnetic actuator, through which the valve member is movable. The electromagnetic actuator has an armature acting at least indirectly on the valve member, a magnetic coil surrounding the magnet armature and a magnetic core. The magnet armature is displaceably guided in a carrier element, wherein the carrier element and the magnetic core are connected to one another. When the solenoid is energized, the armature is movable against the force of a return spring and comes at least indirectly on the magnetic core to the plant. Between the armature and the magnetic core, a spacer made of non-magnetic material may be arranged to ensure a residual air gap and to magnetically bond the armature to the magnetic core avoid. When hitting the armature on the magnetic core, it can lead to high loads of these two components and the connection between the support member and the magnetic core, which can lead to damage of these components over a longer period of operation, whereby the functioning of the intake valve can be impaired.

Durch die EP 1 486 665 A1 ist ein Kraftstoffinjektor bekannt, der ein elektromagnetisch betätigbares Steuerventil aufweist. Das Steuerventil weist einen elektromagnetischen Aktor auf, der wiederum einen Magnetanker, eine Magnetspule und einen Magnetkern aufweist. Der Magnetkern ist zusammen mit einem hydraulischen Anschlussteil in einem hülsenförmigen Gehäusekörper angeordnet. Bei Bestromung der Magnetspule kommt der Magnetanker am Magnetkern zur Anlage, wobei sich der Magnetkern am Anschlussteil abstützt. Der Magnetkern ist mit einer Beschichtung aus elastischem Material versehen, durch die eine Abdichtung zwischen dem Magnetkern und dem Anschlussteil sichergestellt wird. Die Beschichtung kann außerdem eine Dämpfung zwischen dem Magnetkern und dem Anschlussteil beim Anschlagen des Magnetankers am Magnetkern bewirken. Bei einem elektromagnetisch betätigbaren Einlassventil gemäß der DE 10 2013 220 593 A1 , bei dem der Magnetkern auch mit dem Trägerelement verbunden ist, kann durch eine derartige elastische Beschichtung jedoch unter Umständen keine ausreichende Abstützung des Magnetkerns erreicht werden.By the EP 1 486 665 A1 a fuel injector is known which has an electromagnetically actuable control valve. The control valve has an electromagnetic actuator, which in turn has a magnetic armature, a magnetic coil and a magnetic core. The magnetic core is arranged together with a hydraulic connection part in a sleeve-shaped housing body. When the magnet coil is energized, the magnet armature comes to rest on the magnet core, with the magnet core being supported on the connection part. The magnetic core is provided with a coating of elastic material, by which a seal between the magnetic core and the connection part is ensured. The coating can also cause a damping between the magnetic core and the connecting part when striking the armature on the magnetic core. In an electromagnetically actuated intake valve according to the DE 10 2013 220 593 A1 in which the magnetic core is also connected to the carrier element, however, under certain circumstances, sufficient support of the magnetic core can not be achieved by such an elastic coating.

Durch die DE 14 76 146 A1 ist ein Brennstoffeinspritzventil bekannt, das ein elektromagnetisch betätigbares Steuerventil aufweist. Das Steuerventil weist einen elektromagnetischen Aktor auf, der wiederum einen Magnetanker, eine Magnetspule und einen Magnetkern aufweist. Der Magnetkern ist zusammen mit der Magnetspule in einem Gehäusekörper angeordnet. Zur Fixierung des Magnetkerns und der Magnetspule im Gehäusekörper sind diese in einem Kunstharzmaterial eingekapselt, wobei der gesamte Zwischenraum zwischen dem Magnetkern und der Magnetspule sowie dem Gehäusekörper mit dem Kunstharzmaterial ausgefüllt ist. Hierzu ist ein großer Materialeinsatz erforderlich und ein aufwendiger Prozeß zum Einbringen des Kunstharzmaterials erforderlich.By the DE 14 76 146 A1 For example, a fuel injection valve is known which has an electromagnetically actuable control valve. The control valve has an electromagnetic actuator, which in turn has a magnetic armature, a magnetic coil and a magnetic core. The magnetic core is arranged together with the magnetic coil in a housing body. For fixing the magnetic core and the magnetic coil in the housing body, these are encapsulated in a synthetic resin material, wherein the entire space between the magnetic core and the magnetic coil and the housing body is filled with the synthetic resin material. For this purpose, a large amount of material is required and an expensive process for introducing the synthetic resin material required.

Offenbarung der ErfindungDisclosure of the invention Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Einlassventil mit den Merkmalen des Anspruchs 1 hat demgegenüber den Vorteil, dass durch die aus Klebstoff bestehende Zwischenschicht, der nach Einbringung des Magnetkerns aushärtet, eine sichere Abstützung des Magnetkerns erreicht wird, und dadurch die Belastung der Verbindung zwischen dem Trägerelement und dem Magnetkern beim Anschlagen des Magnetankers entlastet werden kann. Durch die Anordnung der Zwischenschicht nur auf der dem Magnetanker abgewandten Seite des Magnetkerns ist nur ein geringer Materialeinsatz erforderlich.The inlet valve according to the invention with the features of claim 1 has the advantage that a secure support of the magnetic core is achieved by the intermediate layer consisting of adhesive, which hardens after introduction of the magnetic core, and thereby the load on the connection between the support member and the magnetic core Striking the armature can be relieved. The arrangement of the intermediate layer only on the side facing away from the magnet armature of the magnetic core only a small amount of material is required.

In den abhängigen Ansprüchen sind vorteilhafte Ausgestaltungen und Weiterbildungen des erfindungsgemäßen Einlassventils angegeben.In the dependent claims advantageous refinements and developments of the inlet valve according to the invention are given.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung wird nachfolgend anhand der beigefügten Zeichnung näher beschrieben. Es zeigen Figur 1 einen schematischen Längsschnitt durch eine Hochdruckpumpe, Figur 2 in vergrößerter Darstellung einen in Figur 1 mit II bezeichneten Ausschnitt mit dem Einlassventil der Hochdruckpumpe, Figur 3 einen in Figur 2 mit III bezeichneten Ausschnitt in weiter vergrößerter Darstellung gemäß einem Ausführungsbeispiel.An embodiment of the invention will be described below with reference to the accompanying drawings. Show it FIG. 1 a schematic longitudinal section through a high-pressure pump, FIG. 2 in an enlarged view a in FIG. 1 labeled II section with the inlet valve of the high-pressure pump, FIG. 3 one in FIG. 2 With III designated section in a further enlarged view according to an embodiment.

Beschreibung des AusführungsbeispielsDescription of the embodiment

In Figur 1 ist ausschnittsweise eine Hochdruckpumpe dargestellt, die zur Kraftstoffförderung in einem Kraftstoffeinspritzsystem einer Brennkraftmaschine vorgesehen ist. Die Hochdruckpumpe weist wenigstens ein Pumpenelement 10 auf, das wiederum einen Pumpenkolben 12 aufweist, der durch einen Antrieb in einer Hubbewegung angetrieben wird, in einer Zylinderbohrung 14 eines Gehäuseteils 16 der Hochdruckpumpe geführt ist und in der Zylinderbohrung 14 einen Pumpenarbeitsraum 18 begrenzt. Als Antrieb für den Pumpenkolben 12 kann eine Antriebswelle 20 mit einem Nocken 22 oder Exzenter vorgesehen sein, an dem sich der Pumpenkolben 12 direkt oder über einen Stößel, beispielsweise einen Rollenstößel, abstützt. Der Pumpenarbeitsraum 18 ist über ein Einlassventil 24 mit einem Kraftstoffzulauf 26 verbindbar und über ein Auslassventil 28 mit einem Speicher 30. Beim Saughub des Pumpenkolbens 12 kann der Pumpenarbeitsraum 18 bei geöffnetem Einlassventil 24 mit Kraftstoff befüllt werden. Beim Förderhub des Pumpenkolbens 12 wird durch diesen Kraftstoff aus dem Pumpenarbeitsraum 18 verdrängt und in den Speicher 30 gefördert.In FIG. 1 is a fragmentary illustrated a high-pressure pump, which is provided for fuel delivery in a fuel injection system of an internal combustion engine. The high-pressure pump has at least one pump element 10, which in turn has a pump piston 12 which is driven by a drive in a lifting movement, is guided in a cylinder bore 14 of a housing part 16 of the high-pressure pump and limits a pump working chamber 18 in the cylinder bore 14. As a drive for the pump piston 12, a drive shaft 20 may be provided with a cam 22 or eccentric on which the pump piston 12 directly or via a plunger, for example a Roller tappet, supports. The pump working chamber 18 can be connected to a fuel inlet 26 via an inlet valve 24 and via an outlet valve 28 to a reservoir 30. During the suction stroke of the pump piston 12, the pump working chamber 18 can be filled with fuel when the inlet valve 24 is open. During the delivery stroke of the pump piston 12 is displaced by this fuel from the pump working chamber 18 and conveyed into the memory 30.

Im Gehäuseteil 16 der Hochdruckpumpe schließt sich wie in Figur 2 dargestellt an die Zylinderbohrung 14 auf deren dem Pumpenkolben 12 abgewandter Seite eine Durchgangsbohrung 32 mit kleinerem Durchmesser als die Zylinderbohrung 14 an, die auf der Außenseite der Gehäuseteils 16 mündet. Das Einlassventil 24 weist ein kolbenförmiges Ventilglied 34 auf, das einen in der Durchgangsbohrung 32 verschiebbar geführten Schaft 36 und einen im Durchmesser gegenüber dem Schaft 36 größeren Kopf 38 aufweist, der im Pumpenarbeitsraum 18 angeordnet ist. Am Übergang von der Zylinderbohrung 14 zur Durchgangsbohrung 32 ist am Gehäuseteil 16 ein Ventilsitz 40 gebildet, mit dem das Ventilglied 34 mit einer an seinem Kopf 38 ausgebildeten Dichtfläche 42 zusammenwirkt.In the housing part 16 of the high-pressure pump closes as in FIG. 2 represented on the cylinder bore 14 on the pump piston 12 side facing away from a through hole 32 with a smaller diameter than the cylinder bore 14, which opens on the outside of the housing part 16. The inlet valve 24 has a piston-shaped valve member 34 which has a shaft 36 displaceably guided in the through-bore 32 and a head 38 which is larger in diameter than the shaft 36 and which is arranged in the pump working space 18. At the transition from the cylinder bore 14 to the through hole 32, a valve seat 40 is formed on the housing part 16, with which the valve member 34 cooperates with a formed on its head 38 sealing surface 42.

In einem an den Ventilsitz 40 anschließenden Abschnitt weist die Durchgangsbohrung 32 einen größeren Durchmesser auf als in deren den Schaft 36 des Ventilglieds 34 führendem Abschnitt, so dass ein den Schaft 36 des Ventilglieds 34 umgebender Ringraum 44 gebildet ist. In den Ringraum 44 münden eine oder mehrere Zulaufbohrungen 46, die andererseits auf der Außenseite des Gehäuseteils 16 münden.In a subsequent to the valve seat 40 portion, the through hole 32 has a larger diameter than in the shaft 36 of the valve member 34 leading section, so that the shaft 36 of the valve member 34 surrounding annular space 44 is formed. In the annular space 44 open one or more inlet bores 46, on the other hand open on the outside of the housing part 16.

Der Schaft 36 des Ventilglieds 34 ragt auf der dem Pumpenarbeitsraum 18 abgewandten Seite des Gehäuseteils 16 aus der Durchgangsbohrung 32 heraus und auf diesem ist ein Stützelement 48 befestigt. Am Stützelement 48 stützt sich eine Ventilfeder 50 ab, die sich andererseits an einem den Schaft 36 des Ventilglieds 34 umgebenden Bereich 52 des Gehäuseteils 16 abstützt. Durch die Ventilfeder 50 wird das Ventilglied 34 in einer Stellrichtung A in dessen Schließrichtung beaufschlagt, wobei das Ventilglied 34 in seiner Schließstellung mit seiner Dichtfläche 42 am Ventilsitz 40 anliegt. Die Ventilfeder 50 ist beispielsweise als Schraubendruckfeder ausgebildet.The shaft 36 of the valve member 34 protrudes on the pump working chamber 18 side facing away from the housing part 16 out of the through hole 32 and on this a support member 48 is attached. On the support member 48, a valve spring 50 is supported, which on the other hand is supported on a portion 52 of the housing part 16 surrounding the shaft 36 of the valve member 34. By the valve spring 50, the valve member 34 is acted upon in a direction of adjustment A in the closing direction, wherein the valve member 34 rests in its closed position with its sealing surface 42 on the valve seat 40. The valve spring 50 is formed for example as a helical compression spring.

Das Einlassventil 24 ist durch einen elektromagnetischen Aktor 60 betätigbar, der insbesondere in Figur 2 dargestellt ist. Der Aktor 60 wird durch eine elektronische Steuereinrichtung 62 in Abhängigkeit von Betriebsparametern der zu versorgenden Brennkraftmaschine angesteuert. Der elektromagnetische Aktor 60 weist eine Magnetspule 64, einen Magnetkern 66 und einen Magnetanker 68 auf. Der elektromagnetische Aktor 60 ist auf der dem Pumpenarbeitsraum 18 abgewandten Seite des Einlassventils 24 angeordnet. Der Magnetkern 66 und die Magnetspule 64 sind in einem Gehäusekörper 70 angeordnet, der am Gehäuseteil 16 der Hochdruckpumpe befestigbar ist. Der Gehäusekörper 70 ist beispielsweise mittels eines dieses übergreifenden Schraubrings 72 am Gehäuseteil 16 befestigbar, der auf einem mit einem Außengewinde versehenen Kragen 74 des Gehäuseteils 16 aufgeschraubt ist.The inlet valve 24 is actuated by an electromagnetic actuator 60, which in particular in FIG. 2 is shown. The actuator 60 is controlled by an electronic control device 62 as a function of operating parameters of the internal combustion engine to be supplied. The electromagnetic actuator 60 has a magnetic coil 64, a magnetic core 66 and a magnet armature 68. The electromagnetic actuator 60 is arranged on the pump working chamber 18 side facing away from the inlet valve 24. The magnetic core 66 and the magnetic coil 64 are arranged in a housing body 70 which can be fastened to the housing part 16 of the high-pressure pump. The housing body 70 can be fastened to the housing part 16, for example, by means of a screw ring 72 which overlaps it and which is screwed onto a collar 74 of the housing part 16 provided with an external thread.

Der Magnetanker 68 ist zumindest im wesentlichen zylinderförmig ausgebildet und über seinen Außenmantel in einer Bohrung 76 in einem im Gehäusekörper 70 angeordneten Trägerelement 78 verschiebbar geführt. Die Bohrung 76 im Trägerelement 78 verläuft zumindest annähernd koaxial zur Durchgangsbohrung 32 im Gehäuseteil 16 und somit zum Ventilglied 34. Das Trägerelement 78 weist in seinem dem Gehäuseteil 16 abgewandten Endbereich 79 eine zylindrische Außenform auf. Der Magnetkern 66 ist im Gehäusekörper 70 auf der dem Gehäuseteil 16 abgewandten Seite des Trägerelements 78 angeordnet und weist eine zylindrische Außenform auf.The armature 68 is at least substantially cylindrical in shape and slidably guided over its outer jacket in a bore 76 in a carrier element 78 arranged in the housing body 70. The bore 76 in the support member 78 extends at least approximately coaxially to the through hole 32 in the housing part 16 and thus to the valve member 34. The support member 78 has in its the housing part 16 opposite end portion 79 has a cylindrical outer shape. The magnetic core 66 is arranged in the housing body 70 on the side facing away from the housing part 16 of the support member 78 and has a cylindrical outer shape.

Der Magnetanker 68 weist eine zumindest annähernd koaxial zur Längsachse 69 des Magnetankers 68 angeordnete zentrale Bohrung 80 auf, in die eine auf der dem Ventilglied 34 abgewandten Seite des Magnetankers 68 angeordnete Rückstellfeder 82 hineinragt, die sich am Magnetanker 68 abstützt. Die Rückstellfeder 82 ist an ihrem anderen Ende zumindest mittelbar am Magnetkern 66 abgestützt, der eine zentrale Bohrung 84 aufweist, in die die Rückstellfeder 82 hineinragt. In der Bohrung 84 des Magnetankers 66 kann ein Abstützelement 85 für die Rückstellfeder 82 eingefügt, beispielsweise eingepresst sein. In die zentrale Bohrung 80 des Magnetankers 68 ist ein Zwischenelement 86 eingesetzt, das als Ankerbolzen ausgebildet sein kann. Der Ankerbolzen 86 ist vorzugsweise in die Bohrung 80 des Magnetankers 68 eingepresst. Die Rückstellfeder 80 kann sich in der Bohrung 80 auch am Ankerbolzen 86 abstützen. Der Magnetanker 68 kann eine oder mehrere Durchgangsöffnungen 67 aufweisen.The armature 68 has an at least approximately coaxial with the longitudinal axis 69 of the magnet armature 68 disposed central bore 80 into which a on the valve member 34 remote from the armature 68 disposed return spring 82 projects, which is supported on the armature 68. The return spring 82 is supported at its other end at least indirectly on the magnetic core 66 having a central bore 84 into which the return spring 82 protrudes. In the bore 84 of the armature 66, a support member 85 may be inserted for the return spring 82, for example, be pressed. In the central bore 80 of the magnet armature 68, an intermediate element 86 is inserted, which may be formed as an anchor bolt. The anchor bolt 86 is preferably pressed into the bore 80 of the magnet armature 68. The return spring 80 may also be supported in the bore 80 on the anchor bolt 86. The magnet armature 68 may have one or more passage openings 67.

In der Bohrung 76 ist durch eine Durchmesserverringerung zwischen dem Magnetanker 68 und dem Einlassventil 24 eine Ringschulter 88 gebildet, durch die die Bewegung des Magnetankers 68 zum Einlassventil 24 hin begrenzt ist. Wenn der Gehäusekörper 70 noch nicht am Gehäuseteil 16 der Hochdruckpumpe befestigt ist, so ist der Magnetanker 68 durch die Ringschulter 88 gegen Herausfallen aus der Bohrung 76 gesichert. Zwischen der Ringschulter 88 und dem Magnetanker 68 kann eine Scheibe 89 angeordnet sein.In the bore 76, an annular shoulder 88 is formed by a reduction in diameter between the armature 68 and the inlet valve 24, by which the movement of the armature 68 is limited to the inlet valve 24 out. If the housing body 70 is not yet attached to the housing part 16 of the high pressure pump, the armature 68 is secured by the annular shoulder 88 against falling out of the bore 76. Between the annular shoulder 88 and the magnet armature 68, a disc 89 may be arranged.

Das Trägerelement 78 und der Magnetkern 66 sind mittels eines hülsenförmigen Verbindungselements 90 miteinander verbunden. Das Verbindungselement 90 ist dabei mit seinem einen axialen Endbereich 90a auf dem zylindrischen Abschnitt 79 des Trägerelements 78 angeordnet und mit diesem verbunden und mit seinem anderen axialen Endbereich 90b auf dem zylindrischen Magnetkern 66 angeordnet und mit diesem verbunden. Das Verbindungselement 90 ist beispielsweise mit dem Trägerelement 78 und dem Magnetkern 66 stoffschlüssig verbunden, insbesondere verschweißt. In einem zwischen dessen axialen Endbereichen 90a,90b angeordneten mittleren Bereich 90c ist das Verbindungselement 90 weder mit dem Trägerelement 78 noch mit dem Magnetkern 66 verbunden und überbrückt einen axialen Abstand zwischen Trägerelement 78 und Magnetkern 66. Bei Bestromung der Magnetspule 64 wird der Magnetanker 68 gegen die Kraft der Rückstellfeder 82 zum Magnetkern 66 hin gezogen und kommt zumindest mittelbar am Magnetkern 66 zur Anlage.The carrier element 78 and the magnetic core 66 are connected to one another by means of a sleeve-shaped connecting element 90. The connecting element 90 is arranged with its one axial end portion 90a on the cylindrical portion 79 of the support member 78 and connected thereto and arranged with its other axial end portion 90b on the cylindrical magnetic core 66 and connected thereto. The connecting element 90 is, for example, materially connected to the carrier element 78 and the magnetic core 66, in particular welded. In a middle region 90c arranged between its axial end regions 90a, 90b, the connecting element 90 is connected neither to the carrier element 78 nor to the magnetic core 66 and bridges an axial distance between the carrier element 78 and the magnetic core 66. When the magnetic coil 64 is energized, the magnet armature 68 is counteracted the force of the return spring 82 is pulled towards the magnetic core 66 and comes at least indirectly on the magnetic core 66 to the plant.

Der Gehäusekörper 70 ist vorzugsweise aus Kunststoff hergestellt, beispielsweise in einem Spritzgießverfahren. Hierbei wird die Magnetspule 64 sowie gegebenenfalls weitere Teile des elektromagnetischen Aktors 60 von dem Kunststoffmaterial des Gehäusekörpers 70 umspritzt. Der Magnetkern 66 bildet jedoch zusammen mit dem Trägerelement 78 eine vormontierte Baugruppe, die nach der Herstellung des Gehäusekörpers 70 in diesen eingesetzt wird. Der Magnetkern 66 tritt dabei in eine diesen auf dessen Umfang umgebende Vertiefung 94 im Gehäusekörper 70 ein. Die Vertiefung 94 ist auf deren dem Trägerelement 78 abgewandter Seite durch eine Wandung 95 des Gehäusekörpers 70 begrenzt.The housing body 70 is preferably made of plastic, for example in an injection molding process. In this case, the magnetic coil 64 and optionally further parts of the electromagnetic actuator 60 are encapsulated by the plastic material of the housing body 70. However, the magnetic core 66 together with the carrier element 78 forms a preassembled module, which is used after the production of the housing body 70 in this. The magnetic core 66 in this case enters into a surrounding recess 94 in the housing body 70 on its circumference. The recess 94 is limited on its side facing away from the carrier element 78 by a wall 95 of the housing body 70.

Erfindungsgemäß ist vorgesehen, dass sich der Magnetkern 66 zumindest auf seiner dem Magnetanker 68 abgewandten Seite über eine Zwischenschicht 96 am Gehäusekörper 70, insbesondere an dessen Wandung 95 abstützt. Die Zwischenschicht 96 wird vor der Einbringung des Magnetkerns 66 auf dem Gehäusekörper 70 und/oder auf dem Magnetkern 66 aufgebracht und bei der Einbringung des Magnetkerns 66 in den Gehäusekörper 70 teilweise verdrängt.According to the invention, it is provided that the magnetic core 66 at least on its side facing away from the magnet armature 68 via an intermediate layer 96 on the housing body 70, in particular on the wall 95 is supported. The intermediate layer 96 is applied before the introduction of the magnetic core 66 on the housing body 70 and / or on the magnetic core 66 and partially displaced during the introduction of the magnetic core 66 into the housing body 70.

Bei einem in Figur 3 dargestellten Ausführungsbeispiel besteht die Zwischenschicht 96 aus einem Klebstoff, der während der Einbringung des Magnetkerns 66 in den Gehäusekörper 70 plastisch verformbar ist. Bei der Einbringung des Magnetkerns 66 in den Gehäusekörper 70 wird der Klebstoff teilweise vom Magnetkern 66 verdrängt, so dass sichergestellt ist, dass ein zwischen der Stirnseite des Magnetkerns 66 und der Wandung 95 vorhandener Zwischenraum vollständig mit Klebstoff gefüllt ist. Nach der Einbringung des Magnetkerns 66 in den Gehäusekörper 70 härtet der Klebstoff aus, so dass der Magnetkern 66 über die Zwischenschicht 96 aus Klebstoff an der Wandung 95 des Gehäusekörpers 70 abgestützt ist.At an in FIG. 3 1, the intermediate layer 96 consists of an adhesive which is plastically deformable during the introduction of the magnetic core 66 into the housing body 70. When introducing the magnetic core 66 into the housing body 70, the adhesive is partially displaced by the magnetic core 66, so that it is ensured that a space present between the end face of the magnetic core 66 and the wall 95 is completely filled with adhesive. After the introduction of the magnetic core 66 into the housing body 70, the adhesive hardens, so that the magnetic core 66 is supported on the wall 95 of the housing body 70 via the intermediate layer 96 of adhesive.

Durch die Abstützung des Magnetkerns 66 über die Zwischenschicht 96 am Gehäusekörper 70 auf der dem Magnetanker 68 abgewandten Seite des Magnetkerns 66 wird die Belastung der Verbindung mittels des Verbindungselements 92 zwischen dem Trägerelement 78 und dem Magnetkern 66 beim Anschlagen des Magnetankers 68 zumindest mittelbar am Magnetkern 66 verringert, da ein Teil der auftretenden Kräfte vom Magnetkern 66 über die Zwischenschicht 96 vom Gehäusekörper 70 aufgenommen wird.By supporting the magnetic core 66 via the intermediate layer 96 on the housing body 70 on the magnet armature 68 side facing away from the magnetic core 66, the load of the connection by means of the connecting element 92 between the support member 78 and the magnetic core 66 when striking the armature 68 at least indirectly on the magnetic core 66th decreases, since a portion of the forces occurring from the magnetic core 66 via the intermediate layer 96 is received by the housing body 70.

Nachfolgend wird die Funktion des elektromagnetisch betätigten Einlassventils 24 erläutert. Während des Saughubs des Pumpenkolbens 12 ist das Einlassventil 24 geöffnet, indem sich dessen Ventilglied 34 in seiner Öffnungsstellung befindet, in der dieses mit seiner Dichtfläche 42 vom Ventilsitz 40 entfernt angeordnet ist. Die Bewegung des Ventilglieds 34 in seine Öffnungsstellung wird durch die zwischen dem Kraftstoffzulauf 26 und dem Pumpenarbeitsraum 18 herrschende Druckdifferenz gegen die Kraft der Ventilfeder 50 bewirkt. Die Magnetspule 64 des Aktors 60 kann dabei bestromt oder unbestromt sein. Wenn die Magnetspule 64 bestromt ist so wird der Magnetanker 68 durch das entstehende Magnetfeld gegen die Kraft der Rückstellfeder 80 zum Magnetkern 66 hin gezogen. Wenn die Magnetspule 64 nicht bestromt ist so wird der Magnetanker 68 durch die Kraft der Rückstellfeder 82 zum Einlassventil 24 hin gedrückt. Der Magnetanker 68 liegt über den Ankerbolzen 86 an der Stirnseite des Schafts 36 des Ventilglieds 34 an.Hereinafter, the function of the solenoid-operated intake valve 24 will be explained. During the intake stroke of the pump piston 12, the inlet valve 24 is opened by the valve member 34 is in its open position, in which this is arranged with its sealing surface 42 away from the valve seat 40. The movement of the valve member 34 in its open position is effected by the prevailing between the fuel inlet 26 and the pump working chamber 18 pressure difference against the force of the valve spring 50. The magnetic coil 64 of the actuator 60 may be energized or de-energized. When the solenoid 64 is energized, the armature 68 is pulled by the resulting magnetic field against the force of the return spring 80 to the magnetic core 66 out. When the solenoid 64 is deenergized, the armature 68 is urged toward the inlet valve 24 by the force of the return spring 82. The magnet armature 68 abuts over the anchor bolt 86 on the end face of the shaft 36 of the valve member 34.

Während des Förderhubs des Pumpenkolbens 12 wird durch den Aktor 60 bestimmt ob sich das Ventilglied 34 des Einlassventils 24 in seiner Öffnungsstellung oder Schließstellung befindet. Bei unbestromter Magnetspule 64 wird der Magnetanker 68 durch die Rückstellfeder 82 in der Stellrichtung gemäß Pfeil B in Figur 2 gedrückt, wobei das Ventilglied 34 durch den Magnetanker 68 gegen die Ventilfeder 50 in der Stellrichtung B in seine Öffnungsstellung gedrückt wird. Die Kraft der auf den Magnetanker 68 wirkenden Rückstellfeder 82 ist größer als die Kraft der auf das Ventilglied 34 wirkenden Ventilfeder 50. In die Stellrichtung B wirkt der Magnetanker 68 auf das Ventilglied 34 und der Magnetanker 68 und das Ventilglied 34 werden gemeinsam in die Stellrichtung B bewegt. Solange die Magnetspule 64 nicht bestromt ist kann somit durch den Pumpenkolben 12 kein Kraftstoff in den Speicher 30 gefördert werden sondern vom Pumpenkolben 12 verdrängter Kraftstoff wird in den Kraftstoffzulauf 26 zurückgefördert. Wenn während des Förderhubs des Pumpenkolbens 12 Kraftstoff in den Speicher 30 gefördert werden soll so wird die Magnetspule 64 bestromt, so dass der Magnetanker 68 zum Magnetkern 66 hin in einer zur Stellrichtung B entgegengesetzten Stellrichtung gemäß Pfeil A in Figur 2 gezogen wird. Durch den Magnetanker 68 wird somit keine Kraft mehr auf das Ventilglied 34 ausgeübt, wobei der Magnetanker 68 durch das Magnetfeld in die Stellrichtung A bewegt wird und das Ventilglied 34 unabhängig vom Magnetanker 68 bedingt durch die Ventilfeder 50 und die zwischen dem Pumpenarbeitsraum 18 und dem Kraftstoffzulauf 26 herrschende Druckdifferenz in der Stellrichtung A in seine Schließstellung bewegt wird.During the delivery stroke of the pump piston 12 is determined by the actuator 60, whether the valve member 34 of the inlet valve 24 is in its open position or closed position. When energized solenoid 64, the armature 68 is pressed by the return spring 82 in the direction of arrow B in Figure 2, wherein the valve member 34 is pressed by the armature 68 against the valve spring 50 in the direction of adjustment B in its open position. The force of the force acting on the armature 68 return spring 82 is greater than the force of the valve member 34 acting on the valve spring 50. In the direction of adjustment B, the armature 68 acts on the valve member 34 and the armature 68 and the valve member 34 are together in the direction of adjustment B emotional. As long as the solenoid coil 64 is not energized can thus be promoted by the pump piston 12 no fuel in the memory 30 but displaced by the pump piston 12 fuel is fed back into the fuel inlet 26. If during the delivery stroke of the pump piston 12 fuel is to be conveyed into the reservoir 30, the magnetic coil 64 is energized, so that the armature 68 toward the magnetic core 66 in a direction opposite to the direction of adjustment B direction of arrow A in FIG. 2 is pulled. The armature 68 thus no longer exerts force on the valve member 34, wherein the magnet armature 68 is moved by the magnetic field in the direction A and the valve member 34 independent of the armature 68 due to the valve spring 50 and between the pump working chamber 18 and the fuel inlet 26 prevailing pressure difference in the direction of adjustment A is moved to its closed position.

Durch das Öffnen des Einlassventils 34 beim Förderhub des Pumpenkolbens 12 mittels des elektromagnetischen Aktors 60 kann die Fördermenge der Hochdruckpumpe in den Speicher 30 variabel eingestellt werden. Wenn eine geringe Kraftstofffördermenge erforderlich ist so wird das Einlassventil 34 durch den Aktor 60 während eines großen Teils des Förderhubs des Pumpenkolbens 12 offen gehalten und wenn eine große Kraftstofffördermenge erforderlich ist, so wird das Einlassventil 34 nur während eines kleinen Teils oder gar nicht während des Förderhubs des Pumpenkolbens 12 offen gehalten.By opening the inlet valve 34 during the delivery stroke of the pump piston 12 by means of the electromagnetic actuator 60, the delivery rate of the high-pressure pump can be set variably in the memory 30. When a small fuel delivery amount is required, the intake valve 34 is kept open by the actuator 60 during a large part of the delivery stroke of the pump piston 12, and if a large fuel delivery amount is required, the intake valve 34 becomes only for a small part or not at all during the delivery stroke the pump piston 12 is kept open.

Claims (4)

  1. Electromagnetically actuable inlet valve (24) for a high-pressure pump, in particular of a fuel injection system, having a valve member (34) which is able to be moved between an open position and a closed position, and having an electromagnetic actuator (60) by way of which the valve member (34) is able to be moved, wherein the electromagnetic actuator (60) has a magnet armature (68) which acts at least indirectly on the valve member (34), a magnet coil (64) which surrounds the magnet armature (68), and a magnet core (66) against which the magnet armature (68) comes to bear at least indirectly when the magnet coil (64) is energized, wherein the magnet armature (68) is guided in a displaceable manner in a carrier element (78), and wherein the carrier element (78) and the magnet core (66) are connected to one another,
    characterized in that the magnet core (66) is surrounded at least partially by a housing body (70), and in that the magnet core (66) is supported via an intermediate layer (96) in the housing body (70) only on that side of said magnet core which is averted from the magnet armature (68), and in that the intermediate layer (96) consists of adhesive which is plastically deformable while the magnet core (66) is being introduced into the housing body (70) and which cures after the magnet core (66) has been introduced.
  2. Inlet valve according to Claim 1,
    characterized in that the magnet core (66) is of at least approximately cylindrical form, and in that the intermediate layer (96) covers at least that end side of said magnet core which is averted from the magnet armature (68).
  3. Inlet valve according to either of the preceding claims,
    characterized in that the magnet coil (64) is also accommodated in the housing body (70).
  4. High-pressure pump, in particular high-pressure fuel pump, having at least one pump element (10) which has a pump piston (12) which delimits a pump working chamber (18), wherein the pump working chamber (18) is able to be connected to an inflow (26) via an inlet valve (24),
    characterized in that the inlet valve (24) is formed according to one of the preceding claims.
EP16763548.1A 2015-10-22 2016-09-13 Electromagnetically operable inlet valve and high-pressure pump having an inlet valve Active EP3365551B1 (en)

Applications Claiming Priority (2)

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DE102015220677.7A DE102015220677A1 (en) 2015-10-22 2015-10-22 Electromagnetically actuated inlet valve and high-pressure pump with inlet valve
PCT/EP2016/071571 WO2017067715A1 (en) 2015-10-22 2016-09-13 Electromagnetically operable inlet valve and high-pressure pump having an inlet valve

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DE102018218379A1 (en) * 2018-10-26 2020-04-30 Robert Bosch Gmbh Electromagnetically actuated inlet valve and high pressure pump with inlet valve

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Publication number Priority date Publication date Assignee Title
GB1064679A (en) * 1962-12-03 1967-04-05 Ass Eng Ltd Fuel injectors for internal combustion engines
EP1486665A4 (en) * 2002-03-15 2010-09-01 Bosch Automotive Systems Corp Fuel injector
DE102013220593A1 (en) 2013-10-11 2015-04-16 Robert Bosch Gmbh Electromagnetically controllable suction valve

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