WO2015149965A1 - Pressure control valve for a high pressure accumulator - Google Patents

Pressure control valve for a high pressure accumulator Download PDF

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Publication number
WO2015149965A1
WO2015149965A1 PCT/EP2015/052064 EP2015052064W WO2015149965A1 WO 2015149965 A1 WO2015149965 A1 WO 2015149965A1 EP 2015052064 W EP2015052064 W EP 2015052064W WO 2015149965 A1 WO2015149965 A1 WO 2015149965A1
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WO
WIPO (PCT)
Prior art keywords
control valve
pressure control
pressure
closing member
piezoelectric actuator
Prior art date
Application number
PCT/EP2015/052064
Other languages
German (de)
French (fr)
Inventor
Michael Jupe
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2015149965A1 publication Critical patent/WO2015149965A1/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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
    • F02M69/54—Arrangement of fuel pressure regulators
    • 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
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/21—Fuel-injection apparatus with piezoelectric or magnetostrictive elements
    • 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
    • F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • F02M2200/701—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger mechanical
    • 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
    • F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic
    • 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
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8046—Fuel injection apparatus manufacture, repair or assembly the manufacture involving injection moulding, e.g. of plastic or metal

Definitions

  • the present invention relates to a pressure control valve for a high pressure accumulator and a high pressure accumulator with such a pressure control valve.
  • Modern diesel engines generally have a storage injection system (common rail) in which fuel is compressed by a high-pressure pump and fed to a high-pressure accumulator. From this memory, the fuel is then injected by means of injectors into the individual combustion chambers of the diesel engine.
  • so-called pressure control valves are provided on known high-pressure accumulators with which the pressure in the high-pressure accumulator can be reduced to a specific value
  • Pressure level is adjusted.
  • a pressure regulating valve is known from EP-2333298 Bl.
  • the pressure regulating valve has a closing member, via which a fluidic connection between high-pressure accumulator and a return line, via which the fuel can circulate back into the reservoir, can be opened.
  • a solenoid actuator is provided, which acts on the closing member of the pressure regulating valve.
  • a disadvantage of such an embodiment is that the magnetic actuator requires a relatively large amount of space to provide the necessary magnetic forces to open the closing member and the pressure control valve thus has to be made relatively large and heavy.
  • the pressure control valve according to the invention with the features of claim 1 offers the advantage that the opening and closing of the closing member by a piezoelectric actuator takes place.
  • a piezoelectric actuator can provide an equal force compared to a magnetic actuator with less space to open the closing member of the pressure regulating valve.
  • the switching times of the piezoelectric actuator are faster than the switching times of a solenoid actuator, so that the closing member can open and close faster and thus more accurate control of the pressure in the high-pressure accumulator is possible.
  • a first advantageous development is that the piezoelectric actuator is biased by a plate spring.
  • a plate spring is a cheap and simple component to create a bias on the piezoelectric actuator, which is necessary in the operation of the pressure control valve.
  • a spring plate is arranged between the plate spring and an end face of the piezoelectric actuator.
  • Such a spring plate distributes the force of the plate spring uniformly over the end face of the piezoelectric actuator and thus ensures that the mechanical load is distributed uniformly over the end face of the piezoelectric actuator.
  • such a spring plate may optionally be ground in different thickness classes to compensate for easy and cost-effective manufacturing tolerances and always to realize a constant biasing force by the plate spring in a simple and secure manner.
  • Heat dissipation is at least partially embedded by a potting compound on its lateral surface.
  • a potting compound serves both as a mechanical protection for the piezoelectric actuator, as well as to safely dissipate the heat occurring in the operation of the piezoelectric actuator to the outside. It is particularly advantageous if at least 80% of the lateral surface are embedded in the potting compound in order to ensure the most stable and secure positioning and heat dissipation.
  • the pressure control valve has a valve seat, which cooperates with the closing member, wherein the valve seat is designed as a metal injection molding (MIM) part. Molding is by a metal injection a complex geometry without expensive post-processing possible. It is particularly advantageous if the valve seat, a guide for the closing member and a housing for the piezoelectric actuator are produced as a common component by metal injection molding, whereby the assembly cost can be significantly reduced.
  • MIM metal injection molding
  • a further advantageous development is that between the piezoelectric actuator and the closing member, a hydraulic coupler is arranged. In this way, a simple and fast coupling of the closing member to the piezoelectric actuator can take place. It is particularly advantageous if the hydraulic coupler comprises a booster piston.
  • a further advantageous development is that the closing member, in particular a valve needle, is guided in a screw-in sleeve.
  • a simple and secure mounting of the pressure control valve according to the invention on the high-pressure accumulator is possible.
  • a shoulder is formed on the screw-in sleeve, in particular an outer diameter of the screw-in sleeve, wherein the shoulder carries a sealing element. In this way, a simple and secure seal between screw-in and housing of the high-pressure accumulator is possible. Such a seal can be realized particularly easily by means of an O-ring.
  • the high-pressure accumulator according to the invention has the advantage that the combination of accumulator and pressure control valve is both lighter and requires less installation space.
  • the high-pressure accumulator can be easily mounted and fits even in tightly packed unit assemblies under the hood of a motor vehicle.
  • the weight savings can increase both fuel consumption and passive safety in the event of a crash.
  • FIG. 1 shows an embodiment of a high pressure accumulator (1) according to the invention with a pressure control valve (10) according to the invention.
  • FIG. 1 an inventive high-pressure accumulator 1 is shown with a pressure control valve 10 according to the invention.
  • the high-pressure accumulator 1 has a housing 2 and a fluid chamber 3.
  • the high-pressure accumulator 1 also has on an end face 6 an opening 7 for receiving a pressure regulating valve 10.
  • the high-pressure accumulator 1 also has an opening 5 for connecting a return line
  • the pressure regulating valve 10 comprises a housing 12, which is designed in the example shown in three parts and a valve seat 40, a screw 44 and an end piece 49 has.
  • the valve seat 40 can be closed by a closing member 20, in particular a valve needle 21, so that a fluidic connection from the fluid chamber 3 of the high-pressure accumulator 1 to the return line 35 is interrupted.
  • a closing member 20 in particular a valve needle 21
  • an opening 13 is formed, via which the
  • Housing 12 is at least indirectly fluidly connected to the return line 35.
  • the pressure regulating valve 10 also has a spring 37 which acts on the closing member 20 and prevents the fluidic connection between the fluid chamber 3 and the return line 35.
  • a piezoelectric actuator 30 is envisaged, which can act with a hydraulic coupler 32, in particular with a booster piston 33, on the closing member 20 when the piezoelectric actuator 30 is energized.
  • the piezoelectric actuator 30 is biased by a plate spring 50, wherein between the plate spring 50 and the piezoelectric actuator 30, a spring plate 51 is arranged, which the force of the plate spring 50 evenly on an end face of the piezoelectric actuator 30 distributed.
  • Spring plate 51 can be made to adjust the spring force, for example by different manufacturing tolerances in piezoelectric actuator 30 and housing 12 in different thickness classes as a selection group to facilitate the adjustment of the spring force.
  • a lateral surface 36 of the piezoelectric actuator 30 is enveloped by a potting compound 34.
  • the piezoelectric actuator 30 is securely positioned in the housing 12 and electrically insulated by the potting compound 34; on the other hand, heat that is produced during operation of the piezoelectric actuator 30 can be dissipated to the housing via the potting compound 34.
  • a shoulder 45 is formed, which carries a sealing element 46, in particular an O-ring.
  • a fluidic sealing of the fluid space 3 or of the pressure regulating valve 10 to the outside takes place via the sealing element, so that no fuel can escape from the fluid space 3.
  • the screw-in sleeve 44 also has an external thread 47 with which the screw-in sleeve 44 can be screwed into the opening 7 of the high-pressure accumulator 1.
  • the valve seat 40 can be designed as a turned part, but is preferably designed as a metal injection molding (MIM) component.
  • MIM metal injection molding
  • a method such as the metal injection molding also makes it possible to produce the housing 12 with the valve seat 40, the screw 44 and the end piece 49 as a common component, which significantly reduces the assembly effort.
  • the pressure control valve 10 is initially closed by the closing member 20 is pressed by the spring 37 against the valve seat 40.
  • the spring force is overcome and the closing member 20 rises from the valve seat 40, whereby fuel from the fluid chamber 3 of the high-pressure accumulator 1 through the pressure control valve 12 via the opening 13 in the return line 35 can flow and thus the pressure in the fluid space 3 of the High-pressure accumulator 1 is reduced. Due to the fast switching times of the piezoelectric actuator 30 a particularly fast and accurate control of the pressure is possible, so that the return amount can be limited, which increases the overall efficiency of the injection system, as less fuel circulates.

Landscapes

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

Abstract

The invention relates to a pressure control valve (10) and a high pressure accumulator (1) comprising a pressure control valve (10). Said pressure control valve (10) comprises a housing (12) in which a pressurised fluid, in particular fuel, can be stored. At least one opening (13) is provided on the housing (12), via which the housing (12) can be connected at least indirectly to a return line (35). Said pressure control valve (10) comprises a closing member (20) via which a fluidic connection between the high pressure accumulator (1) and the return line (35) can be opened and closed. A piezo actuator (30) is provided for moving the closing member (20).

Description

Druckregelventil für einen Hochdruckspeicher  Pressure control valve for a high-pressure accumulator
Die vorliegende Erfindung betrifft ein Druckregelventil für einen Hochdruckspeicher sowie einen Hochdruckspeicher mit einem solchen Druckregelventil. The present invention relates to a pressure control valve for a high pressure accumulator and a high pressure accumulator with such a pressure control valve.
Stand der Technik State of the art
Moderne Dieselmotoren verfügen in der Regel über ein Speicher- Einspritz-System (Common- Rail), bei dem Kraftstoff von einer Hochdruckpumpe verdichtet und einem Hochdruckspeicher zugeführt wird. Aus diesem Speicher wird der Kraftstoff dann mittels Injektoren in die einzelnen Brennräume des Dieselmotors eingespritzt. Um zu verhindern, dass der Druck im Hochdruckspeicher einen kritischen Schwellenwert übersteigt, sind an bekannten Hochdruckspeichern sogenannte Druckregelventile vorgesehen, mit denen der Druck im Hochdruckspeicher auf ein bestimmtes  Modern diesel engines generally have a storage injection system (common rail) in which fuel is compressed by a high-pressure pump and fed to a high-pressure accumulator. From this memory, the fuel is then injected by means of injectors into the individual combustion chambers of the diesel engine. In order to prevent the pressure in the high-pressure accumulator from exceeding a critical threshold value, so-called pressure control valves are provided on known high-pressure accumulators with which the pressure in the high-pressure accumulator can be reduced to a specific value
Druckniveau eingeregelt wird. Ein solches Druckregelventil ist aus der EP-2333298 Bl bekannt. Dabei weist das Druckregelventil ein Schließglied auf, über welches eine fluidische Verbindung zwischen Hochdruckspeicher und einer Rücklaufleitung, über die der Kraftstoff zurück in den Vorratsbehälter zirkulieren kann, geöffnet werden kann. Zum Öffnen und Schließen des Schließglieds ist ein Magnetaktuator vorgesehen, welcher auf das Schließglied des Druckregelventils einwirkt. Pressure level is adjusted. Such a pressure regulating valve is known from EP-2333298 Bl. In this case, the pressure regulating valve has a closing member, via which a fluidic connection between high-pressure accumulator and a return line, via which the fuel can circulate back into the reservoir, can be opened. For opening and closing the closing member, a solenoid actuator is provided, which acts on the closing member of the pressure regulating valve.
Nachteilig bei einer solchen Ausführungsform ist allerdings, dass der Magnetaktuator relativ viel Bauraum benötigt, um die notwendigen Magnetkräfte zum Öffnen des Schließgliedes bereit zu stellen und das Druckregelventil somit relativ groß und schwer ausgeführt werden muss. A disadvantage of such an embodiment, however, is that the magnetic actuator requires a relatively large amount of space to provide the necessary magnetic forces to open the closing member and the pressure control valve thus has to be made relatively large and heavy.
Offenbarung der Erfindung Disclosure of the invention
Das erfindungsgemäße Druckregelventil mit den Merkmalen des Anspruchs 1 bietet demgegenüber den Vorteil, dass das Öffnen und Schließen des Schließgliedes durch einen Piezoaktor erfolgt. Ein Piezoaktor kann im Vergleich zu einem Magnetaktuator bei geringerem Bauraum eine gleich große Kraft bereitstellen, um das Schließglied des Druckregelventils zu öffnen. Zudem sind die Schaltzeiten des Piezoaktors schneller als die Schaltzeiten eines Magnetaktuators, so dass das Schließglied schneller öffnen und schließen kann und somit eine genauere Regelung des Drucks im Hochdruckspeicher möglich ist. The pressure control valve according to the invention with the features of claim 1 offers the advantage that the opening and closing of the closing member by a piezoelectric actuator takes place. A piezoelectric actuator can provide an equal force compared to a magnetic actuator with less space to open the closing member of the pressure regulating valve. In addition, the switching times of the piezoelectric actuator are faster than the switching times of a solenoid actuator, so that the closing member can open and close faster and thus more accurate control of the pressure in the high-pressure accumulator is possible.
Durch die in den abhängigen Ansprüchen angeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen der im unabhängigen Anspruch angegebenen Druckregelventils und des Hochdruckspeichers möglich. The measures cited in the dependent claims advantageous refinements and improvements of the independent claim specified pressure control valve and the high-pressure accumulator are possible.
Eine erste vorteilhafte Weiterbildung besteht darin, dass der Piezoaktor über eine Tellerfeder unter Vorspannung gesetzt ist. Eine Tellerfeder ist ein günstiges und einfaches Bauteil, um eine Vorspannung auf den Piezoaktor zu erzeugen, welche im Betrieb des Druckregelventils notwendig ist. Besonders vorteilhaft ist dabei, wenn zwischen der Tellerfeder und einer Stirnseite des Piezoaktors ein Federteller angeordnet ist. Ein solcher Federteller verteilt die Kraft der Tellerfeder gleichmäßig über die Stirnfläche des Piezoaktors und sorgt somit dafür, dass die mechanische Belastung gleichmäßig über die Stirnfläche des Piezoaktors verteilt wird. Zudem kann ein solcher Federteller ggf. in unterschiedlichen Dickenklassen geschliffen werden, um auf einfach und kostengünstig Fertigungstoleranzen auszugleichen und auf einfache und sichere Weise stets eine konstante Vorspannkraft durch die Tellerfeder zu realisieren. Eine weitere vorteilhafte Weiterbildung besteht darin, dass der Piezoaktor zurA first advantageous development is that the piezoelectric actuator is biased by a plate spring. A plate spring is a cheap and simple component to create a bias on the piezoelectric actuator, which is necessary in the operation of the pressure control valve. It is particularly advantageous if a spring plate is arranged between the plate spring and an end face of the piezoelectric actuator. Such a spring plate distributes the force of the plate spring uniformly over the end face of the piezoelectric actuator and thus ensures that the mechanical load is distributed uniformly over the end face of the piezoelectric actuator. In addition, such a spring plate may optionally be ground in different thickness classes to compensate for easy and cost-effective manufacturing tolerances and always to realize a constant biasing force by the plate spring in a simple and secure manner. A further advantageous development is that the piezoelectric actuator for
Wärmeabfuhr an seiner Mantelfläche zumindest Abschnittsweise von einer Vergussmasse eingebettet ist. Eine solche Vergussmasse dient sowohl als mechanischer Schutz für den Piezoaktor, als auch, um die im Betreib des Piezoaktors auftretende Wärme sicher nach außen abzuführen. Besonders vorteilhaft ist dabei, wenn mindestens 80% der Mantelfläche in die Vergussmasse eingebettet sind, um eine möglichst stabile und sichere Positionierung und Wärmeabfuhr zu gewährleisten. Heat dissipation is at least partially embedded by a potting compound on its lateral surface. Such a potting compound serves both as a mechanical protection for the piezoelectric actuator, as well as to safely dissipate the heat occurring in the operation of the piezoelectric actuator to the outside. It is particularly advantageous if at least 80% of the lateral surface are embedded in the potting compound in order to ensure the most stable and secure positioning and heat dissipation.
Eine weitere vorteilhafte Weiterbildung besteht darin, dass das Druckregelventil einen Ventilsitz aufweist, der mit dem Schließglied zusammenwirkt, wobei der Ventilsitz als Metal-Injektion-Molding (MIM) Teil ausgeführt ist. Durch ein Metal-Injektion Molding ist eine komplexe Geometrieform ohne aufwendige Nachbearbeitung möglich. Besonders vorteilhaft ist dabei, wenn der Ventilsitz, eine Führung für das Schließglied sowie ein Gehäuse für den Piezoaktor als ein gemeinsames Bauteil per Metal-Injektion-Molding hergestellt werden, wodurch der Montageaufwand deutlich reduziert werden kann. A further advantageous development is that the pressure control valve has a valve seat, which cooperates with the closing member, wherein the valve seat is designed as a metal injection molding (MIM) part. Molding is by a metal injection a complex geometry without expensive post-processing possible. It is particularly advantageous if the valve seat, a guide for the closing member and a housing for the piezoelectric actuator are produced as a common component by metal injection molding, whereby the assembly cost can be significantly reduced.
Eine weitere vorteilhafte Weiterbildung besteht darin, dass zwischen dem Piezoaktor und dem Schließglied ein hydraulischer Koppler angeordnet ist. Auf diese Weise kann eine einfache und schnelle Ankoppelung des Schließglieds an den Piezoaktor erfolgen. Besonders vorteilhaft ist dabei, wenn der hydraulische Koppler einen Übersetzerkolben umfasst. A further advantageous development is that between the piezoelectric actuator and the closing member, a hydraulic coupler is arranged. In this way, a simple and fast coupling of the closing member to the piezoelectric actuator can take place. It is particularly advantageous if the hydraulic coupler comprises a booster piston.
Eine weitere vorteilhafte Weiterbildung besteht darin, dass das Schließglied, insbesondere eine Ventilnadel, in einer Einschraubhülse geführt ist. Durch die Einschraubhülse ist eine einfache und sichere Montage des erfindungsgemäßen Druckregelventils am Hochdruckspeicher möglich. Besonders vorteilhaft ist dabei, wenn an der Einschraubhülse, insbesondere einem Außendurchmesser der Einschraubhülse, ein Absatz ausgebildet ist, wobei der Absatz eine Dichtelement trägt. Auf diese Weise ist eine einfache und sichere Abdichtung zwischen Einschraubhülse und Gehäuse des Hochdruckspeichers möglich. Besonders einfach lässt sich eine solche Abdichtung durch einen O-Ring realisieren. A further advantageous development is that the closing member, in particular a valve needle, is guided in a screw-in sleeve. By screwing a simple and secure mounting of the pressure control valve according to the invention on the high-pressure accumulator is possible. It is particularly advantageous if a shoulder is formed on the screw-in sleeve, in particular an outer diameter of the screw-in sleeve, wherein the shoulder carries a sealing element. In this way, a simple and secure seal between screw-in and housing of the high-pressure accumulator is possible. Such a seal can be realized particularly easily by means of an O-ring.
Der erfindungsgemäße Hochdruckspeicher bietet gegenüber den aus dem Stand der Technik bekannten Lösungen den Vorteil, dass die Kombination aus Speicher und Druckregelventil sowohl leichter ist, als auch weniger Bauraum benötigt. Somit kann der Hochdruckspeicher leichter montiert werden und passt auch bei eng gepackten Aggregatsanordnungen unter die Motorhaube eines Kraftfahrzeugs. Durch die Gewichtsersparnis kann sowohl der Kraftstoffverbrauch als auch die passive Sicherheit im Fall eines Crashs gesteigert werden. Compared with the solutions known from the prior art, the high-pressure accumulator according to the invention has the advantage that the combination of accumulator and pressure control valve is both lighter and requires less installation space. Thus, the high-pressure accumulator can be easily mounted and fits even in tightly packed unit assemblies under the hood of a motor vehicle. The weight savings can increase both fuel consumption and passive safety in the event of a crash.
Zeichnungen drawings
Ein Ausführungsbeispiel der Erfindung ist in der nachfolgenden Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Fig. 1 zeigt ein Ausführungsbeispiel eines erfindungsgemäßen Hochdruckspeichers (1 ) mit einem erfindungsgemäßen Druckregelventil (10). An embodiment of the invention is illustrated in the following drawings and explained in more detail in the following description. Fig. 1 shows an embodiment of a high pressure accumulator (1) according to the invention with a pressure control valve (10) according to the invention.
Kurze Beschreibung der Zeichnungen Brief description of the drawings
Die Erfindung sowie vorteilhafte Ausgestaltungen gemäß den Merkmalen der weiteren Ansprüche werden im Folgenden anhand der in den Zeichnungen dargestellten Ausführungsbeispiele näher erläutert.  The invention and advantageous embodiments according to the features of the other claims are explained in more detail below with reference to the embodiments illustrated in the drawings.
In Fig. 1 ist ein erfindungsgemäßer Hochdruckspeicher 1 mit einem erfindungsgemäßen Druckregelventil 10 dargestellt. Der Hochdruckspeicher 1 weist ein Gehäuse 2 sowie einen Fluidraum 3 auf. Der Hochdruckspeicher 1 weist ferner an einer Stirnseite 6 eine Öffnung 7 zur Aufnahme eines Druckregelventils 10 auf. Der Hochdruckspeicher 1 weist ferner eine Öffnung 5 zum Anschluss einer RücklaufleitungIn Fig. 1, an inventive high-pressure accumulator 1 is shown with a pressure control valve 10 according to the invention. The high-pressure accumulator 1 has a housing 2 and a fluid chamber 3. The high-pressure accumulator 1 also has on an end face 6 an opening 7 for receiving a pressure regulating valve 10. The high-pressure accumulator 1 also has an opening 5 for connecting a return line
35 sowie mindestens eine (nicht dargestellte) Öffnung zum Anschluss eines Kraftstoffinjektors. Das Druckregelventil 10 umfasst ein Gehäuse 12, welches in dem dargestellten Beispiel dreiteilig ausgeführt ist und einen Ventilsitz 40, einer Einschraubhülse 44 sowie eine Endstück 49 aufweist. Dem Fluidraum 3 des Hochdruckspeichers 1 zugewandt ist in Strömungsrichtung vor dem Ventilsitz 40 ein35 and at least one (not shown) opening for connection of a fuel injector. The pressure regulating valve 10 comprises a housing 12, which is designed in the example shown in three parts and a valve seat 40, a screw 44 and an end piece 49 has. The fluid space 3 of the high-pressure accumulator 1 facing in the flow direction in front of the valve seat 40 a
Partikelfilter 14 an dem Druckregelventil 10 angeordnet. Der Ventilsitz 40 kann durch ein Schließglied 20, insbesondere eine Ventilnadel 21, verschlossen werden, so dass eine fluidische Verbindung vom Fluidraum 3 des Hochdruckspeichers 1 zur Rücklaufleitung 35 unterbrochen ist. An dem Gehäuse 12 des Druckregelventils 10, insbesondere an dem Ventilsitz 40 ist eine Öffnung 13 ausgebildet, über welche dasParticle filter 14 disposed on the pressure control valve 10. The valve seat 40 can be closed by a closing member 20, in particular a valve needle 21, so that a fluidic connection from the fluid chamber 3 of the high-pressure accumulator 1 to the return line 35 is interrupted. On the housing 12 of the pressure regulating valve 10, in particular on the valve seat 40, an opening 13 is formed, via which the
Gehäuse 12 zumindest mittelbar fluidisch mit der Rücklaufleitung 35 verbindbar ist. Housing 12 is at least indirectly fluidly connected to the return line 35.
Das Druckregelventil 10 weist ferner eine Feder 37 auf, welche auf das Schließglied 20 wirkt und die fluidische Verbindung zwischen Fluidraum 3 und Rücklaufleitung 35 unterbindet. Zum Öffnen des Schließglieds 20 ist ein Piezoaktor 30 vergesehen, welcher mit einem hydraulischen Koppler 32, insbesondere mit einem Übersetzerkolben 33, auf das Schließglied 20 einwirken kann, wenn der Piezoaktor 30 bestromt wird. Der Piezoaktor 30 wird durch eine Tellerfeder 50 vorgespannt, wobei zwischen der Tellerfeder 50 und dem Piezoaktor 30 ein Federteller 51 angeordnet ist, welcher die Kraft der Tellerfeder 50 gleichmäßig auf eine Stirnfläche des Piezoaktors 30 verteilt. Federteller 51 können zur Einstellung der Federkraft, beispielsweise durch unterschiedliche Fertigungstoleranzen bei Piezoaktor 30 und Gehäuse 12 in unterschiedlichen Dickenklassen als Auswahlgruppe gefertigt sein, um das Einstellen der Federkraft zu erleichtern. Eine Mantelfläche 36 des Piezoaktors 30 ist von einer Vergussmasse 34 umhüllt. Durch die Vergussmasse 34 wird der Piezoaktor 30 zum einen sicher in dem Gehäuse 12 positioniert und elektrisch isoliert, zum anderen kann über die Vergussmass 34 Wärme, welche im Betrieb des Piezoaktors 30 entsteht, an das Gehäuse abgeführt werden. The pressure regulating valve 10 also has a spring 37 which acts on the closing member 20 and prevents the fluidic connection between the fluid chamber 3 and the return line 35. To open the closing member 20, a piezoelectric actuator 30 is envisaged, which can act with a hydraulic coupler 32, in particular with a booster piston 33, on the closing member 20 when the piezoelectric actuator 30 is energized. The piezoelectric actuator 30 is biased by a plate spring 50, wherein between the plate spring 50 and the piezoelectric actuator 30, a spring plate 51 is arranged, which the force of the plate spring 50 evenly on an end face of the piezoelectric actuator 30 distributed. Spring plate 51 can be made to adjust the spring force, for example by different manufacturing tolerances in piezoelectric actuator 30 and housing 12 in different thickness classes as a selection group to facilitate the adjustment of the spring force. A lateral surface 36 of the piezoelectric actuator 30 is enveloped by a potting compound 34. On the one hand, the piezoelectric actuator 30 is securely positioned in the housing 12 and electrically insulated by the potting compound 34; on the other hand, heat that is produced during operation of the piezoelectric actuator 30 can be dissipated to the housing via the potting compound 34.
An der Einschraubhülse 44 ist ein Absatz 45 ausgebildet, welcher eine Dichtelement 46, insbesondere einen O-Ring, trägt. Über das Dichtelement erfolgt eine fluidische Abdichtung des Fluidraums 3 bzw. des Druckregelventils 10 nach außen, so dass kein Kraftstoff aus dem Fluidraum 3 austreten kann. Die Einschraubhülse 44 weist ferner ein Außengewinde 47 auf, mit der die Einschraubhülse 44 in die Öffnung 7 des Hochdruckspeichers 1 eingeschraubt werden kann. At the screw 44 a shoulder 45 is formed, which carries a sealing element 46, in particular an O-ring. A fluidic sealing of the fluid space 3 or of the pressure regulating valve 10 to the outside takes place via the sealing element, so that no fuel can escape from the fluid space 3. The screw-in sleeve 44 also has an external thread 47 with which the screw-in sleeve 44 can be screwed into the opening 7 of the high-pressure accumulator 1.
Der Ventilsitz 40 kann als Drehteil ausgeführt werden, bevorzugt wird er jedoch als Metal-Injekton-Molding (MIM) Bauteil ausgeführt. Durch ein formgebendes Verfahren wie Metal-Injektion-Moldiung kann die Geometrie des Ventilsitzes auf einfache und kostengünstige Weise hergestellt werden. Ein Verfahren wie das Metal-Injektion- Molding erlaubt es zudem, das Gehäuse 12 mit dem Ventilsitz 40, der Einschraubhülse 44 sowie dem Endstück 49 als ein gemeinsames Bauteil herzustellen, was den Montageaufwand deutlich reduziert. The valve seat 40 can be designed as a turned part, but is preferably designed as a metal injection molding (MIM) component. By a molding process such as metal injection molding, the geometry of the valve seat can be made in a simple and cost-effective manner. A method such as the metal injection molding also makes it possible to produce the housing 12 with the valve seat 40, the screw 44 and the end piece 49 as a common component, which significantly reduces the assembly effort.
Im Betrieb des Hochdruckspeichers 1 ist das Druckregelventil 10 zunächst geschlossen, indem das Schließglied 20 durch die Feder 37 gegen den Ventilsitz 40 gepresst wird. Durch Ansteuerung des Piezoaktors 30 wird die Federkraft überwunden und das Schließglied 20 hebt sich aus dem Ventilsitz 40, wodurch Kraftstoff aus Fluidraum 3 des Hochdruckspeichers 1 durch das Druckregelventil 12 über die Öffnung 13 in die Rücklaufleitung 35 strömen kann und somit der Druck im Fluidraum 3 des Hochdruckspeicher 1 abgebaut wird. Durch die schnellen Schaltzeiten des Piezoaktuors 30 ist eine besonders schnelle und genaue Regelung des Drucks möglich, so dass die Rücklaufmenge begrenzt werden kann, was insgesamt den Wirkungsgrad des Einspritzsystems erhöht, da weniger Kraftstoff zirkuliert. During operation of the high-pressure accumulator 1, the pressure control valve 10 is initially closed by the closing member 20 is pressed by the spring 37 against the valve seat 40. By driving the piezoelectric actuator 30, the spring force is overcome and the closing member 20 rises from the valve seat 40, whereby fuel from the fluid chamber 3 of the high-pressure accumulator 1 through the pressure control valve 12 via the opening 13 in the return line 35 can flow and thus the pressure in the fluid space 3 of the High-pressure accumulator 1 is reduced. Due to the fast switching times of the piezoelectric actuator 30 a particularly fast and accurate control of the pressure is possible, so that the return amount can be limited, which increases the overall efficiency of the injection system, as less fuel circulates.

Claims

Ansprüche claims
1. Druckregelventil (10), insbesondere für einen Hochdruckspeicher (1) eines Kraftstoffeinspritzsystems , mit einem Gehäuse (12), in welchem ein unter Druck stehendes Fluid, insbesondere Kraftstoff, bevorratet werden kann, wobei an dem Gehäuse (12) mindestens eine Öffnung (13) vorgesehen ist, über die das Gehäuse (12) zumindest mittelbar an eine Rücklaufleitung (35) anschließbar ist, und wobei das Druckregelventil (10) ein Schließglied (20) aufweist, über welches eine fluidische Verbindung zwischen Hochdruckspeicher (1) und Rücklaufleitung (35) geöffnet und geschlossen werden kann, dadurch gekennzeichnet, dass ein Piezoaktor (30) zur Bewegung des Schließgliedes (20) vorgesehen ist. 1. Pressure control valve (10), in particular for a high-pressure accumulator (1) of a fuel injection system, with a housing (12) in which a pressurized fluid, in particular fuel, can be stored, wherein on the housing (12) at least one opening ( 13) is provided, via which the housing (12) at least indirectly to a return line (35) can be connected, and wherein the pressure regulating valve (10) has a closing member (20) via which a fluidic connection between the high-pressure accumulator (1) and return line ( 35) can be opened and closed, characterized in that a piezoelectric actuator (30) for movement of the closing member (20) is provided.
2. Druckregelventil (10) nach Anspruch 1, dadurch gekennzeichnet, dass der Piezoaktor (30) über eine Tellerfeder (50) unter Vorspannung gesetzt ist. 2. Pressure control valve (10) according to claim 1, characterized in that the piezoelectric actuator (30) via a plate spring (50) is set under pretension.
3. Druckregelventil (10) nach Anspruch 2, dadurch gekennzeichnet, dass zwischen der Tellerfeder (50) und dem Piezoaktor (30) ein Federteller (51) angeordnet ist. 3. Pressure control valve (10) according to claim 2, characterized in that between the plate spring (50) and the piezoelectric actuator (30), a spring plate (51) is arranged.
4. Druckregelventil (10) nach einem der Ansprüche 1 bis 3, dadurch 4. Pressure control valve (10) according to one of claims 1 to 3, characterized
gekennzeichnet, dass der Piezoaktor (30) zur Wärmeabfuhr an seiner Mantelfläche (36) zumindest Abschnittsweise von einer Vergussmasse (34) eingebettet ist. characterized in that the piezoelectric actuator (30) for heat dissipation on its lateral surface (36) at least partially embedded by a potting compound (34).
5. Druckregelventil (10) nach einem der Ansprüche 1 bis 4, dadurch 5. Pressure control valve (10) according to any one of claims 1 to 4, characterized
gekennzeichnet, dass das Druckregelventil (10) einen Ventilsitz (40) aufweist, der mit dem Schließglied (20) zusammenwirkt, wobei der Ventilsitz (40) als Metal-Injektion- Molding (MIM) Teil ausgeführt ist. characterized in that the pressure regulating valve (10) has a valve seat (40) which cooperates with the closing member (20), wherein the valve seat (40) is designed as a metal injection molding (MIM) part.
6. Druckregelventil (10) nach einem der Ansprüche 1 bis 5, dadurch 6. Pressure control valve (10) according to one of claims 1 to 5, characterized
gekennzeichnet, dass zwischen dem Piezoaktor (30) und dem Schließglied (20) ein hydraulischer Koppler (32) angeordnet ist. in that a hydraulic coupler (32) is arranged between the piezoactuator (30) and the closing member (20).
7. Druckregelventil (10) nach Anspruch 6, dadurch gekennzeichnet, dass der hydraulische Koppler (32) einen Übersetzerkolben (33) umfasst. 7. Pressure control valve (10) according to claim 6, characterized in that the hydraulic coupler (32) comprises a booster piston (33).
8. Druckregelventil (10) nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass das Schließglied (20), insbesondere eine Ventilnadel (21) in einer Einschraubhülse (44) geführt ist. 8. Pressure control valve (10) according to one of claims 1 to 7, characterized in that the closing member (20), in particular a valve needle (21) is guided in a screw-in sleeve (44).
9. Druckregelventil (10) nach Anspruch 8, dadurch gekennzeichnet, dass an Einschraubhülse (44) ein Absatz (45) ausgebildet ist, wobei der Absatz (45) ein Dichtelement (46), insbesondere einen O-Ring, trägt. 9. Pressure control valve (10) according to claim 8, characterized in that on Einschraubhülse (44) has a shoulder (45) is formed, wherein the shoulder (45) carries a sealing element (46), in particular an O-ring.
10. Hochdruckspeicher (1) mit einem Druckregelventil (10) nach einem der Ansprüche 1 bis 9. 10. High-pressure accumulator (1) with a pressure regulating valve (10) according to one of claims 1 to 9.
PCT/EP2015/052064 2014-03-31 2015-02-02 Pressure control valve for a high pressure accumulator WO2015149965A1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19952774A1 (en) * 1999-11-03 2001-05-23 Daimler Chrysler Ag Device for letting off fluid from a system under high pressure includes an outlet opening sealed by a valve device with a piezo element for operating it
EP1557597A1 (en) * 2004-01-21 2005-07-27 Robert Bosch Gmbh Pressure control valve for a high pressure reservoir of an internal combustion engine
EP1612403A1 (en) * 2004-06-30 2006-01-04 C.R.F. Societa' Consortile per Azioni Servo valve for controlling an internal combustion engine fuel injector
DE102005036950A1 (en) * 2005-08-05 2007-02-08 Robert Bosch Gmbh Multiple part metallic molding, especially valve seat component for combustion engine injection valve, is obtained by multistage metal injection molding process allowing variation of properties of the parts
EP2733345A1 (en) * 2012-11-20 2014-05-21 Robert Bosch GmbH Pressure control valve for a high pressure storage tank of a combustion engine

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2953268B1 (en) 2009-12-02 2012-04-06 Bosch Gmbh Robert ELECTROMAGNETIC VALVE FOR CONTROLLING AN INJECTOR OR PRESSURE REGULATION OF A HIGH-PRESSURE FUEL ACCUMULATOR

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19952774A1 (en) * 1999-11-03 2001-05-23 Daimler Chrysler Ag Device for letting off fluid from a system under high pressure includes an outlet opening sealed by a valve device with a piezo element for operating it
EP1557597A1 (en) * 2004-01-21 2005-07-27 Robert Bosch Gmbh Pressure control valve for a high pressure reservoir of an internal combustion engine
EP1612403A1 (en) * 2004-06-30 2006-01-04 C.R.F. Societa' Consortile per Azioni Servo valve for controlling an internal combustion engine fuel injector
DE102005036950A1 (en) * 2005-08-05 2007-02-08 Robert Bosch Gmbh Multiple part metallic molding, especially valve seat component for combustion engine injection valve, is obtained by multistage metal injection molding process allowing variation of properties of the parts
EP2733345A1 (en) * 2012-11-20 2014-05-21 Robert Bosch GmbH Pressure control valve for a high pressure storage tank of a combustion engine

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