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EP2938875B1 - Pressure control valve for a fuel injection system - Google Patents

Pressure control valve for a fuel injection system Download PDF

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Publication number
EP2938875B1
EP2938875B1 EP13786516.8A EP13786516A EP2938875B1 EP 2938875 B1 EP2938875 B1 EP 2938875B1 EP 13786516 A EP13786516 A EP 13786516A EP 2938875 B1 EP2938875 B1 EP 2938875B1
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EP
European Patent Office
Prior art keywords
valve
pressure control
control valve
closing element
spherical
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.)
Active
Application number
EP13786516.8A
Other languages
German (de)
French (fr)
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EP2938875A1 (en
Inventor
Stefan Schuerg
Vittorio Caroli
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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 EP2938875A1 publication Critical patent/EP2938875A1/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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/005—Pressure relief valves
    • F02M63/0052—Pressure relief valves with means for adjusting the opening pressure, e.g. electrically controlled
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0033—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat
    • F02M63/0036—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat with spherical or partly spherical shaped valve member ends
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0071—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059 characterised by guiding or centering means in valves including the absence of any guiding means, e.g. "flying arrangements"
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • F02M63/023—Means for varying pressure in common rails
    • F02M63/0235—Means for varying pressure in common rails by bleeding fuel pressure
    • F02M63/025—Means for varying pressure in common rails by bleeding fuel pressure from the common rail
    • 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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for

Definitions

  • the invention relates to a pressure regulating valve for a fuel injection system, in particular a common rail injection system for pressure control in a high-pressure fuel storage, with the features of the preamble of claim 1.
  • a pressure regulating valve of the aforementioned type comprises a valve housing in which a magnetic actuator and an armature cooperating with the magnetic actuator are accommodated, and a valve member which is connected to the valve housing.
  • a mostly conical valve seat is formed, which cooperates with a spherical valve closing element.
  • the armature has an anchor pin or anchor bolt which serves as a force transmission member and acts on the spherical valve closure element in such a way that it is pressed against the valve seat when the magnetic actuator is energized via the anchor pin or anchor bolt.
  • the anchor pin or the anchor bolt generally have a dome-shaped receptacle for the radial guidance of the spherical valve closure element, which is produced by means of embossing.
  • the present invention has for its object to provide a pressure control valve, which does not have the disadvantages mentioned above.
  • the proposed pressure control valve includes a solenoid actuator for actuating a spherical valve closure member, the solenoid actuator cooperating with a liftable armature connected to an anchor pin for transmitting the force of the solenoid actuator to the spherical valve closure member.
  • the spherical valve closing element and / or the anchor pin are guided in an axially displaceable manner in a valve piece which forms a valve seat cooperating with the spherical valve closing element.
  • at least the spherical valve closing element is axially displaceably guided over the valve piece in such a way that it can no longer perform a radial movement when opening or closing.
  • the anchor pin is guided axially displaceably over the valve piece.
  • the leadership of the anchor pin and the spherical valve closing element is thus carried out on one and the same component. This does not exclude that the anchor pin further in another component of the pressure regulating valve, for example, in a valve housing of the valve, is guided axially displaceable. If there should be an axial offset between the guide in the valve housing and the valve seat, this is compensated by the valve seat closer to the guide in the valve piece.
  • the valve piece has at least two guide surfaces, which limit the radial movement space of the spherical valve closing element and / or the anchor pin.
  • the number of guide surfaces can be even or odd. With an even number of guide surfaces, preferably at least two of the radial movement space of the spherical valve closing element and / or the anchor pin limiting guide surfaces are opposite. These guide surfaces are then aligned parallel to each other.
  • At least two guide surfaces connect directly to the valve seat, which is preferably conical in shape. This means that the guide surfaces grow out of the valve seat.
  • the guide surfaces are axially aligned. The axially extending guide surfaces are therefore preferably on the conical surface of the valve seat.
  • the spherical valve closure element is preferably performed.
  • the anchor pin which has a larger outer diameter than the spherical valve closing element, further preferably guide surfaces are provided, which are arranged opposite to the immediately adjacent to the valve seat guide surfaces radially outward.
  • the guide surfaces for guiding the spherical valve closing element and / or the anchor pin formed on radially extending webs form the guide surfaces.
  • the radially extending webs are arranged at the same angular distance from each other. In three webs, the angular distance - in each case based on the central axes of the webs - 120 °, four webs 90 °, etc. Four webs are therefore preferably cross-shaped and five webs arranged in a star shape, wherein the webs - in contrast to a cross or star - do not cross.
  • the webs limit flow channels. This means that the free spaces between the webs can be used as flow channels in order to ensure the expiry of a controlled via the pressure control valve amount.
  • At least part of the flow channels is hydraulically connected to an armature space.
  • the armature space is therefore connected via at least one flow channel with a formed in the valve piece valve chamber of the pressure control valve. The connection allows pressure equalization between the valve chamber and the armature space.
  • the guide surfaces for guiding the spherical valve member and / or the anchor pin preferably form tangents with respect to the outer diameter of the spherical valve closure member and / or the anchor pin.
  • the spherical valve closure element accordingly has a punctiform contact region and the cylindrical anchor pin has a linear contact region with the respective associated guide surfaces. The contact area is thus reduced to a minimum.
  • the valve piece is a metal powder injection molded part. As such, it has been produced in a metal injection molding (MIM) process. The use of such a method simplifies the manufacture of the valve piece including the guide surfaces.
  • MIM metal injection molding
  • the valve piece has a biting edge on a support surface facing away from the valve seat.
  • the support surface serves to support the valve piece or the pressure control valve when inserted into a stepped bore of a High-pressure accumulator body. About the biting edge can then be achieved a sealing effect.
  • the proposed pressure control valve is designed as a 2/2-way valve.
  • the pressure control valve is particularly suitable for use in a high-pressure fuel storage. In an open position of the pressure regulating valve, a connection of the high pressure accumulator is made with a return, so that the pressure in the high pressure accumulator can be reduced. In a closed position of the pressure control valve, the connection of the high-pressure accumulator is separated to the return, so that pressure can be built up.
  • FIG. 1 illustrated pressure control valve comprises a magnetic actuator 1, which has an annular magnetic coil 17 and cooperates with a liftable armature 3, which is designed in the present case as a plunger armature.
  • the armature 3 is connected to an anchor pin 4, which transmits, as a force transmitting member, the force of the magnetic actuator 1 to a spherical valve closure member 2 when the magnetic actuator 1 is activated, ie. the solenoid 17 is energized.
  • the armature 3 including the anchor pin 4 are moved counter to the spring force of a spring 15 in the direction of the spherical valve closing element 2.
  • the pressure control valve is presently received in a stepped bore 18 of the high pressure accumulator 13 and connected via a screw 19 with this.
  • an external thread is formed on a valve housing 14 of the pressure control valve, which is connectable to an internal thread of the stepped bore 18.
  • the pressure control valve can be axially biased against the high-pressure accumulator, wherein the pressure control valve is supported via a support surface 11 of a valve member 5 at a stage of the stepped bore 18.
  • a trained in the region of the support surface 11 biting edge 12 seals the high-pressure accumulator 13 to the outside.
  • valve piece 5, which also forms the valve seat 6, has a first guide area a for guiding the spherical valve closure element 2 and a second guide area b for guiding the anchor pin 4.
  • the guide is effected in each case via five guide surfaces 7, which are each formed by five webs 8, which are arranged in a star shape around the valve seat 6 around.
  • the five webs 8 of a guide region a, b are each arranged at the same angular distance from each other, so that between the webs 8 flow channels 9 are formed, which are hydraulically connected to an armature space 10 (see FIG. 1 ).
  • the guide surfaces 7 for guiding the spherical valve closing element 2 are located further radially inward than the guide surfaces 7, which serve to guide the anchor pin 4.
  • the guide surfaces 7 for guiding the anchor pin 4 are formed by separate webs 8, which in the present case are arranged in the same angular position as the webs 8 for forming the guide surfaces 7 for guiding the spherical valve closing element 2. In this way, the respectively formed between the webs 8 flow channels 9 overlap.
  • FIG. 2 can also be seen, connect the webs 8 including the guide surfaces 7 of the guide portion a directly to the conical surface of the valve seat 6. They rise, as it were, out of the valve seat area.
  • the conical surface of the valve seat 6 goes beyond, so that the webs 8 of the Guide area b from the conical surface of the valve seat 6 raise. Accordingly, the webs 8 of the two guide areas a, b are connected via the conical surface.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Magnetically Actuated Valves (AREA)
  • Fuel-Injection Apparatus (AREA)

Description

Die Erfindung betrifft ein Druckregelventil für ein Kraftstoffeinspritzsystem, insbesondere ein Common-Rail-Einspritzsystem zur Druckregelung in einem Kraftstoffhochdruckspeicher, mit den Merkmalen des Oberbegriffs des Anspruchs 1.The invention relates to a pressure regulating valve for a fuel injection system, in particular a common rail injection system for pressure control in a high-pressure fuel storage, with the features of the preamble of claim 1.

Stand der TechnikState of the art

Ein Druckregelventil der vorstehend genannten Art umfasst ein Ventilgehäuse, in dem ein Magnetaktor und ein mit dem Magnetaktor zusammenwirkender Anker aufgenommen sind, sowie ein Ventilstück, das mit dem Ventilgehäuse verbunden ist. Im Ventilstück ist ein zumeist kegelförmiger Ventilsitz ausbildet, der mit einem kugelförmigen Ventilschließelement zusammenwirkt. Der Anker besitzt einen Ankerstift oder Ankerbolzen, der als Kraftübertragungsglied dient und auf das kugelförmige Ventilschließelement in der Weise einwirkt, dass es bei einer Bestromung des Magnetaktors über den Ankerstift bzw. Ankerbolzen gegen den Ventilsitz gedrückt wird. Der Ankerstift bzw. der Ankerbolzen weisen in der Regel eine kalottenförmige Aufnahme zur radialen Führung des kugelförmigen Ventilschließelements auf, die mittels Prägen hergestellt wird. Da der Ankerstift bzw. Ankerbolzen im Ventilgehäuse geführt ist, kann es bei einem Achsversatz zwischen der Führung im Ventilgehäuse und dem Ventilsitz über die kalottenförmige Prägung zu einer Überbestimmung des kugelförmigen Ventilschließelementes in Schließstellung des Ventils kommen. Beim Öffnen des Ventils stellt sich dann ein radialer Versatz ein, der beim Schließen dazu führt, dass das kugelförmige Ventilschließelement über die kegelförmige Fläche des Ventilsitzes zurück in den Dichtsitz rutscht (Schließhysterese). Hieraus folgt eine Druckdifferenz zwischen Öffnungs- und Schließdruck sowie eine unerwünschte Geräuschentwicklung.A pressure regulating valve of the aforementioned type comprises a valve housing in which a magnetic actuator and an armature cooperating with the magnetic actuator are accommodated, and a valve member which is connected to the valve housing. In the valve piece a mostly conical valve seat is formed, which cooperates with a spherical valve closing element. The armature has an anchor pin or anchor bolt which serves as a force transmission member and acts on the spherical valve closure element in such a way that it is pressed against the valve seat when the magnetic actuator is energized via the anchor pin or anchor bolt. The anchor pin or the anchor bolt generally have a dome-shaped receptacle for the radial guidance of the spherical valve closure element, which is produced by means of embossing. Since the anchor pin or anchor bolt is guided in the valve housing, there may be an over-determination of the spherical valve closing element in the closed position of the valve with an axial offset between the guide in the valve housing and the valve seat on the dome-shaped embossing. When the valve is opened, a radial offset then sets in which, when closing, causes the spherical valve closing element to slip back into the sealing seat via the conical surface of the valve seat (closing hysteresis). This results in a pressure difference between the opening and closing pressure and an undesirable noise.

Aus der Offenlegungsschrift DE 10 2010 043 092 A1 geht ein Druckregelventil der vorstehend genannten Art hervor, das zum Ausgleich eines etwaigen Achsversatzes zwischen der Führung des Ankerbolzens und dem Ventilsitz einen zumindest zweiteilig ausgeführten Ankerbolzen besitzt. Vorzugsweise umfasst der Ankerbolzen eine Übertragungsstange und ein Druckstück, das zum Ausgleich eines etwaigen Achsversatzes radial verschiebbar in der Übertragungsstange aufgenommen ist. Eine unerwünschte Geräuschentwicklung lässt sich dadurch jedoch nicht wirksam verhindern. Dokument EP 1 967 726 A offenbart auch ein Druckregelventil für ein Kraftstoffeinspritzsystem.From the publication DE 10 2010 043 092 A1 is a pressure control valve of the type mentioned above, which has an at least two-piece anchor bolt to compensate for any axial offset between the guide of the anchor bolt and the valve seat. Preferably, the anchor bolt comprises a transmission rod and a pressure piece which is received radially displaceable in the transmission rod to compensate for any axial offset. However, unwanted noise can not be effectively prevented. document EP 1 967 726 A also discloses a pressure control valve for a fuel injection system.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, ein Druckregelventil anzugeben, das die vorstehend genannten Nachteile nicht aufweist.The present invention has for its object to provide a pressure control valve, which does not have the disadvantages mentioned above.

Zur Lösung der Aufgabe wird ein Druckregelventil mit den Merkmalen des Anspruchs 1 vorgeschlagen. Vorteilhafte Weiterentwicklungen der Erfindung sind den Unteransprüchen zu entnehmen.To solve the problem, a pressure regulating valve with the features of claim 1 is proposed. Advantageous further developments of the invention can be found in the subclaims.

Offenbarung der ErfindungDisclosure of the invention

Das vorgeschlagene Druckregelventil umfasst einen Magnetaktor zur Betätigung eines kugelförmigen Ventilschließelements, wobei der Magnetaktor mit einem hubbeweglichen Anker zusammenwirkt, der mit einem Ankerstift zur Übertragung der Kraft des Magnetaktors auf das kugelförmige Ventilschließelement verbunden ist. Erfindungsgemäß ist bzw. sind das kugelförmige Ventilschließelement und/oder der Ankerstift in einem Ventilstück, das einen mit dem kugelförmigen Ventilschließelement zusammenwirkenden Ventilsitz ausbildet, axial verschiebbar geführt. Bevorzugt ist zumindest das kugelförmige Ventilschließelement über das Ventilstück in der Weise axial verschiebbar geführt, dass es keine radiale Bewegung beim Öffnen oder Schließen mehr ausführen kann. Dadurch werden unerwünschte Geräusche, die bei einer radialen Bewegung des Ventilschließelementes entstehen, wirksam verhindert. Ferner ist sichergestellt, dass es nicht zu einer Schließhysterese kommt, da sich ein radialer Versatz des kugelförmigen Ventilschließelements in Bezug auf den Ventilsitz nicht mehr einstellen kann. Des Weiteren bevorzugt ist zusätzlich der Ankerstift über das Ventilstück axial verschiebbar geführt. Die Führung des Ankerstifts und des kugelförmigen Ventilschließelements erfolgt demnach über ein und dasselbe Bauteil. Dies schließt nicht aus, dass der Ankerstift ferner in einem weiteren Bauteil des Druckregelventils, beispielsweise in einem Ventilgehäuse des Ventils, axial verschiebbar geführt ist. Sofern ein Achsversatz zwischen der Führung im Ventilgehäuse und dem Ventilsitz bestehen sollte, wird dieser über die dem Ventilsitz näher gelegene Führung im Ventilstück kompensiert.The proposed pressure control valve includes a solenoid actuator for actuating a spherical valve closure member, the solenoid actuator cooperating with a liftable armature connected to an anchor pin for transmitting the force of the solenoid actuator to the spherical valve closure member. According to the invention, the spherical valve closing element and / or the anchor pin are guided in an axially displaceable manner in a valve piece which forms a valve seat cooperating with the spherical valve closing element. Preferably, at least the spherical valve closing element is axially displaceably guided over the valve piece in such a way that it can no longer perform a radial movement when opening or closing. As a result, unwanted noise, resulting from a radial movement of the valve closing element, effectively prevented. Furthermore, it is ensured that there is no closing hysteresis, since a radial offset of the spherical valve closing element with respect to the valve seat can no longer adjust. Furthermore, preferably, the anchor pin is guided axially displaceably over the valve piece. The leadership of the anchor pin and the spherical valve closing element is thus carried out on one and the same component. This does not exclude that the anchor pin further in another component of the pressure regulating valve, for example, in a valve housing of the valve, is guided axially displaceable. If there should be an axial offset between the guide in the valve housing and the valve seat, this is compensated by the valve seat closer to the guide in the valve piece.

Aufgrund der Führung des kugelförmigen Ventilschließelements und/oder des Ankerstifts im Ventilstück ist eine kalottenförmige Prägung im Ankerstift entbehrlich. Dadurch vereinfacht sich die Herstellung des vorgeschlagenen Druckregelventils.Due to the guidance of the spherical valve closing element and / or the anchor pin in the valve piece a dome-shaped embossing in the anchor pin is unnecessary. This simplifies the production of the proposed pressure control valve.

Erfindungsgemäß besitzt das Ventilstück wenigstens zwei Führungsflächen, welche den radialen Bewegungsraum des kugelförmigen Ventilschließelements und/oder des Ankerstifts begrenzen. Die Anzahl der Führungsflächen kann gerade oder ungerade sein. Bei einer geraden Anzahl an Führungsflächen liegen sich vorzugsweise wenigstens zwei der den radialen Bewegungsraum des kugelförmigen Ventilschließelements und/oder des Ankerstifts begrenzende Führungsflächen gegenüber. Diese Führungsflächen sind dann parallel zueinander ausgerichtet.According to the invention, the valve piece has at least two guide surfaces, which limit the radial movement space of the spherical valve closing element and / or the anchor pin. The number of guide surfaces can be even or odd. With an even number of guide surfaces, preferably at least two of the radial movement space of the spherical valve closing element and / or the anchor pin limiting guide surfaces are opposite. These guide surfaces are then aligned parallel to each other.

Des Weiteren bevorzugt schließen zumindest zwei Führungsflächen unmittelbar an den Ventilsitz an, der vorzugsweise kegelförmig ausgebildet ist. Das heißt, dass die Führungsflächen aus dem Ventilsitz erwachsen. Um den radialen Bewegungsraum des kugelförmigen Ventilschließelements und/oder des Ankerstifts zu begrenzen, sind die Führungsflächen axial ausgerichtet. Die axial verlaufenden Führungsflächen stehen demzufolge bevorzugt auf der Kegelfläche des Ventilsitzes.Furthermore, preferably at least two guide surfaces connect directly to the valve seat, which is preferably conical in shape. This means that the guide surfaces grow out of the valve seat. In order to limit the radial movement space of the spherical valve closing element and / or the anchor pin, the guide surfaces are axially aligned. The axially extending guide surfaces are therefore preferably on the conical surface of the valve seat.

Über die unmittelbar an den Ventilsitz anschließenden Führungsflächen wird vorzugsweise das kugelförmige Ventilschließelement geführt. Zur Führung des Ankerstifts, der einen größeren Außendurchmesser als das kugelförmige Ventilschließelement besitzt, sind weiterhin vorzugsweise Führungsflächen vorgesehen, die gegenüber den unmittelbar an den Ventilsitz anschließenden Führungsflächen weiter radial außen liegend angeordnet sind.About the immediately adjacent to the valve seat guide surfaces, the spherical valve closure element is preferably performed. To guide the anchor pin, which has a larger outer diameter than the spherical valve closing element, further preferably guide surfaces are provided, which are arranged opposite to the immediately adjacent to the valve seat guide surfaces radially outward.

Erfindungsgemäß sind die Führungsflächen zur Führung des kugelförmigen Ventilschließelements und/oder des Ankerstifts an radial verlaufenden Stegen ausgebildet. Die dem Ventilsitz zugewandten Stirnflächen der Stege bilden die Führungsflächen aus. Vorzugsweise sind die radial verlaufenden Stege im gleichen Winkelabstand zueinander angeordnet. Bei drei Stegen beträgt der Winkelabstand - jeweils bezogen auf die Mittelachsen der Stege - 120°, bei vier Stegen 90° usw. Vier Stege sind demnach bevorzugt kreuzförmig und fünf Stege sternförmig angeordnet, wobei sich die Stege - im Unterschied zu einem Kreuz oder Stern - nicht kreuzen.According to the invention, the guide surfaces for guiding the spherical valve closing element and / or the anchor pin formed on radially extending webs. The valve seat facing end surfaces of the webs form the guide surfaces. Preferably, the radially extending webs are arranged at the same angular distance from each other. In three webs, the angular distance - in each case based on the central axes of the webs - 120 °, four webs 90 °, etc. Four webs are therefore preferably cross-shaped and five webs arranged in a star shape, wherein the webs - in contrast to a cross or star - do not cross.

Alternativ oder ergänzend ist vorgesehen, dass die Stege Strömungskanäle begrenzen. Das heißt, dass die Freiräume zwischen den Stegen als Strömungskanäle nutzbar sind, um den Ablauf einer über das Druckregelventil abgesteuerten Menge zu gewährleisten.Alternatively or additionally, it is provided that the webs limit flow channels. This means that the free spaces between the webs can be used as flow channels in order to ensure the expiry of a controlled via the pressure control valve amount.

Als weiterbildende Maßnahme wird vorgeschlagen, dass zumindest ein Teil der Strömungskanäle mit einem Ankerraum hydraulisch verbunden ist. Der Ankerraum ist demnach über wenigstens einen Strömungskanal mit einem im Ventilstück ausgebildeten Ventilraum des Druckregelventils verbunden. Die Verbindung ermöglicht einen Druckausgleich zwischen Ventilraum und Ankerraum.As a further development measure, it is proposed that at least part of the flow channels is hydraulically connected to an armature space. The armature space is therefore connected via at least one flow channel with a formed in the valve piece valve chamber of the pressure control valve. The connection allows pressure equalization between the valve chamber and the armature space.

Legt man einen Querschnitt durch das Ventilstück, bilden die Führungsflächen zur Führung des kugelförmigen Ventilelements und/oder des Ankerstifts bevorzugt Tangenten in Bezug auf den Außendurchmesser des kugelförmigen Ventilschließelements und/oder des Ankerstifts aus. Das kugelförmige Ventilschließelement weist demzufolge einen punktuellen Kontaktbereich und der zylinderförmige Ankerstift einen linearen Kontaktbereich mit den jeweils zugeordneten Führungsflächen auf. Der Kontaktbereich ist somit auf ein Minimum reduziert.Placing a cross-section through the valve member, the guide surfaces for guiding the spherical valve member and / or the anchor pin preferably form tangents with respect to the outer diameter of the spherical valve closure member and / or the anchor pin. The spherical valve closure element accordingly has a punctiform contact region and the cylindrical anchor pin has a linear contact region with the respective associated guide surfaces. The contact area is thus reduced to a minimum.

Vorteilhafterweise ist das Ventilstück ein Metallpulverspritzgussteil. Als solches ist es in einem Metallpulverspritzgussverfahren (Metal Injection Molding, kurz MIM) hergestellt worden. Die Anwendung eines solchen Verfahrens vereinfacht die Herstellung des Ventilstücks einschließlich der Führungsflächen.Advantageously, the valve piece is a metal powder injection molded part. As such, it has been produced in a metal injection molding (MIM) process. The use of such a method simplifies the manufacture of the valve piece including the guide surfaces.

Erfindungsgemäß besitzt das Ventilstück auf einer dem Ventilsitz abgewandten Stützfläche eine Beißkante. Die Stützfläche dient der Abstützung des Ventilstücks bzw. des Druckregelventils beim Einsetzen in eine Stufenbohrung eines Hochdruckspeicherkörpers. Über die Beißkante kann dann eine Dichtwirkung erzielt werden.According to the invention, the valve piece has a biting edge on a support surface facing away from the valve seat. The support surface serves to support the valve piece or the pressure control valve when inserted into a stepped bore of a High-pressure accumulator body. About the biting edge can then be achieved a sealing effect.

In einer bevorzugten Ausführungsform ist das vorgeschlagene Druckregelventil als 2/2-Wegeventil ausgelegt. In dieser Ausführungsform ist das Druckregelventil insbesondere für den Einsatz in einem Kraftstoffhochdruckspeicher geeignet. In einer Offenstellung des Druckregelventils ist eine Verbindung des Hochdruckspeichers mit einem Rücklauf hergestellt, so dass der Druck im Hochdruckspeicher verringert werden kann. In einer Schließstellung des Druckregelventils ist die Verbindung des Hochdruckspeichers zum Rücklauf getrennt, so dass Druck aufgebaut werden kann.In a preferred embodiment, the proposed pressure control valve is designed as a 2/2-way valve. In this embodiment, the pressure control valve is particularly suitable for use in a high-pressure fuel storage. In an open position of the pressure regulating valve, a connection of the high pressure accumulator is made with a return, so that the pressure in the high pressure accumulator can be reduced. In a closed position of the pressure control valve, the connection of the high-pressure accumulator is separated to the return, so that pressure can be built up.

Eine bevorzugte Ausführungsform wird nachfolgend anhand der beigefügten Zeichnungen näher erläutert. Diese zeigen:

  • Figur 1 einen Längsschnitt durch eine bevorzugte Ausführungsform eines erfindungsgemäßen Druckregelventils und
  • Figur 2 einen vergrößerten Ausschnitt aus der Figur 1 im Bereich des Ventilstücks.
A preferred embodiment will be explained in more detail with reference to the accompanying drawings. These show:
  • FIG. 1 a longitudinal section through a preferred embodiment of a pressure control valve according to the invention and
  • FIG. 2 an enlarged section of the FIG. 1 in the area of the valve piece.

Ausführliche Beschreibung der ZeichnungenDetailed description of the drawings

Das in der Figur 1 dargestellte Druckregelventil umfasst einen Magnetaktor 1, der eine ringförmige Magnetspule 17 besitzt und mit einem hubbeweglichen Anker 3 zusammenwirkt, der vorliegend als Tauchanker ausgebildet ist. Der Anker 3 ist mit einem Ankerstift 4 verbunden, der als Kraftübertragungsglied die Kraft des Magnetaktors 1 auf ein kugelförmiges Ventilschließelement 2 überträgt, wenn der Magnetaktor 1 aktiviert wird, d h. die Magnetspule 17 bestromt wird. Dabei werden der Anker 3 einschließlich des Ankerstifts 4 entgegen der Federkraft einer Feder 15 in Richtung des kugelförmigen Ventilschließelements 2 bewegt. Da drückt der Ankerstift 4 das kugelförmige Ventilschließelement 2 gegen einen kegelförmigen Ventilsitz 6, so dass das Druckregelventil geschlossen und keine Verbindung eines Hochdruckspeichers 13 mit einem Rücklaufanschluss 16 hergestellt ist. Steigt der Druck im Hochdruckspeicher 13 über einen vorgegebenen Grenzwert an, wird die Bestromung der Magnetspule 17 beendet, so dass die Federkraft der Feder 15 den Anker 3 einschließlich des Ankerstifts 4 zurückstellt und das Ventil über den am kugelförmigen Ventilschließelement anliegenden Druck öffnet.That in the FIG. 1 illustrated pressure control valve comprises a magnetic actuator 1, which has an annular magnetic coil 17 and cooperates with a liftable armature 3, which is designed in the present case as a plunger armature. The armature 3 is connected to an anchor pin 4, which transmits, as a force transmitting member, the force of the magnetic actuator 1 to a spherical valve closure member 2 when the magnetic actuator 1 is activated, ie. the solenoid 17 is energized. In this case, the armature 3 including the anchor pin 4 are moved counter to the spring force of a spring 15 in the direction of the spherical valve closing element 2. As the anchor pin 4 presses the spherical valve closure member 2 against a conical valve seat 6, so that the pressure control valve is closed and no connection of a high pressure accumulator 13 is made with a return port 16. If the pressure in the high-pressure accumulator 13 rises above a predetermined limit value, the energization of the magnet coil 17 is ended, so that the Spring force of the spring 15, the armature 3 including the anchor pin 4 resets and opens the valve over the pressure applied to the spherical valve closure member.

Das Druckregelventil ist vorliegend in einer Stufenbohrung 18 des Hochdruckspeichers 13 aufgenommen und über eine Schraubverbindung 19 mit diesem verbunden. Hierzu ist an einem Ventilgehäuse 14 des Druckregelventils ein Außengewinde ausgebildet, das mit einem Innengewinde der Stufenbohrung 18 verbindbar ist. Über die Schraubverbindung 19 kann das Druckregelventil gegen den Hochdruckspeicher axial vorgespannt werden, wobei sich das Druckregelventil über eine Stützfläche 11 eines Ventilstücks 5 an einer Stufe der Stufenbohrung 18 abstützt. Eine im Bereich der Stützfläche 11 ausgebildete Beißkante 12 dichtet den Hochdruckspeicher 13 nach außen hin ab.The pressure control valve is presently received in a stepped bore 18 of the high pressure accumulator 13 and connected via a screw 19 with this. For this purpose, an external thread is formed on a valve housing 14 of the pressure control valve, which is connectable to an internal thread of the stepped bore 18. About the screw 19, the pressure control valve can be axially biased against the high-pressure accumulator, wherein the pressure control valve is supported via a support surface 11 of a valve member 5 at a stage of the stepped bore 18. A trained in the region of the support surface 11 biting edge 12 seals the high-pressure accumulator 13 to the outside.

Wie aus der Figur 2 ersichtlich weist das Ventilstück 5, das auch den Ventilsitz 6 ausbildet, einen ersten Führungsbereich a zur Führung des kugelförmigen Ventilschließelements 2 sowie einen zweiten Führungsbereich b zur Führung des Ankerstifts 4 auf. Die Führung wird jeweils über fünf Führungsflächen 7 bewirkt, die jeweils durch fünf Stege 8 ausgebildet werden, die sternförmig um den Ventilsitz 6 herum angeordnet sind. Die fünf Stege 8 eines Führungsbereichs a, b sind jeweils im gleichen Winkelabstand zueinander angeordnet, so dass zwischen den Stegen 8 Strömungskanäle 9 ausgebildet werden, die mit einem Ankerraum 10 hydraulisch verbunden sind (siehe Figur 1). Da das kugelförmige Ventilschließelement 2 einen kleineren Außendurchmesser als der Ankerstift 4 besitzt, liegen die Führungsflächen 7 zur Führung des kugelförmigen Ventilschließelements 2 weiter radial innen als die Führungsflächen 7, die der Führung des Ankerstifts 4 dienen. Die Führungsflächen 7 zur Führung des Ankerstifts 4 werden durch separate Stege 8 ausgebildet, die vorliegend in gleicher Winkellage wie die Stege 8 zur Ausbildung der Führungsflächen 7 zur Führung des kugelförmigen Ventilschließelements 2 angeordnet sind. Auf diese Weise überdecken sich die jeweils zwischen den Stegen 8 ausgebildeten Strömungskanäle 9.Like from the FIG. 2 the valve piece 5, which also forms the valve seat 6, has a first guide area a for guiding the spherical valve closure element 2 and a second guide area b for guiding the anchor pin 4. The guide is effected in each case via five guide surfaces 7, which are each formed by five webs 8, which are arranged in a star shape around the valve seat 6 around. The five webs 8 of a guide region a, b are each arranged at the same angular distance from each other, so that between the webs 8 flow channels 9 are formed, which are hydraulically connected to an armature space 10 (see FIG. 1 ). Since the spherical valve closing element 2 has a smaller outer diameter than the anchor pin 4, the guide surfaces 7 for guiding the spherical valve closing element 2 are located further radially inward than the guide surfaces 7, which serve to guide the anchor pin 4. The guide surfaces 7 for guiding the anchor pin 4 are formed by separate webs 8, which in the present case are arranged in the same angular position as the webs 8 for forming the guide surfaces 7 for guiding the spherical valve closing element 2. In this way, the respectively formed between the webs 8 flow channels 9 overlap.

Wie der Figur 2 ferner zu entnehmen ist, schließen die Stege 8 einschließlich der Führungsflächen 7 des Führungsbereichs a unmittelbar an die Kegelfläche des Ventilsitzes 6 an. Sie erheben sich gleichsam aus der Ventilsitzfläche. Die Kegelfläche des Ventilsitzes 6 geht darüber hinaus, so dass sich auch die Stege 8 des Führungsbereichs b aus der Kegelfläche des Ventilsitzes 6 erheben. Über die Kegelfläche sind demnach die Stege 8 der beiden Führungsbereiche a, b verbunden. Again FIG. 2 can also be seen, connect the webs 8 including the guide surfaces 7 of the guide portion a directly to the conical surface of the valve seat 6. They rise, as it were, out of the valve seat area. The conical surface of the valve seat 6 goes beyond, so that the webs 8 of the Guide area b from the conical surface of the valve seat 6 raise. Accordingly, the webs 8 of the two guide areas a, b are connected via the conical surface.

Claims (6)

  1. Pressure control valve for a fuel injection system, in particular a common-rail injection system, for controlling the pressure in a highpressure fuel accumulator, comprising a solenoid actuator (1) for the actuation of a spherical valve closing element (2), wherein the solenoid actuator (1) interacts with an armature (3) which can perform a stroke movement and which is connected to an armature pin (4) for the transmission of the force of the solenoid actuator (1) to the spherical valve closing element (2), wherein the spherical valve closing element (2) and the armature pin (3) are guided in axially displaceable fashion in a valve piece (5) which forms a valve seat (6) which interacts with the spherical valve closing element (2),
    characterized in that the valve piece (5) has at least two guide surfaces (7) which delimit the radial movement clearance of the spherical valve closing element (2), wherein the guide surfaces (7) are formed on the radially running webs (8) which are preferably arranged at uniform angular intervals with respect to one another and which delimit flow ducts (9), wherein the valve piece (5) has a biting edge (12) on a support surface (11) averted from the valve seat (6).
  2. Pressure control valve according to Claim 1,
    characterized in that at least two guide surfaces (7) directly adjoin the valve seat (6), which is preferably of conical form.
  3. Pressure control valve according to either of Claims 1 and 2,
    characterized in that at least a part of the flow ducts (9) is hydraulically connected to an armature chamber (10).
  4. Pressure control valve according to one of Claims 1 to 3,
    characterized in that, in a cross section of the valve piece (5), the guide surfaces (7) form tangents to the outer diameter of the spherical valve closing element (2) and/or of the armature pin (4).
  5. Pressure control valve according to one of the preceding claims,
    characterized in that the valve piece (5) is a metal injection molded part.
  6. Pressure control valve according to one of the preceding claims,
    characterized in that the pressure control valve is configured as a 2/2 directional valve.
EP13786516.8A 2012-12-27 2013-11-07 Pressure control valve for a fuel injection system Active EP2938875B1 (en)

Applications Claiming Priority (2)

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DE102012224403.4A DE102012224403A1 (en) 2012-12-27 2012-12-27 Pressure control valve for a fuel injection system
PCT/EP2013/073294 WO2014102028A1 (en) 2012-12-27 2013-11-07 Pressure control valve for a fuel injection system

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EP2938875A1 EP2938875A1 (en) 2015-11-04
EP2938875B1 true EP2938875B1 (en) 2019-03-13

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US (1) US10041459B2 (en)
EP (1) EP2938875B1 (en)
JP (1) JP6343622B2 (en)
CN (1) CN105102807B (en)
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WO (1) WO2014102028A1 (en)

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GB2547949B (en) * 2016-03-04 2019-11-13 Johnson Electric Int Ag Plunger for magnetic latching solenoid actuator
FR3064688A1 (en) * 2017-03-31 2018-10-05 Delphi International Operations Luxembourg S.A R.L. RAMP ASSEMBLY AND HIGH PRESSURE VALVE
CN110552827B (en) * 2018-06-04 2022-11-11 罗伯特·博世有限公司 Oil inlet valve for high-pressure oil pump and corresponding high-pressure oil pump

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CN105102807B (en) 2018-02-06
WO2014102028A1 (en) 2014-07-03
EP2938875A1 (en) 2015-11-04
CN105102807A (en) 2015-11-25
JP6343622B2 (en) 2018-06-13
US20160123289A1 (en) 2016-05-05
DE102012224403A1 (en) 2014-07-03
JP2016502031A (en) 2016-01-21
US10041459B2 (en) 2018-08-07

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