EP1694958B1 - Pressure limiting valve for fuel injection devices - Google Patents

Pressure limiting valve for fuel injection devices Download PDF

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Publication number
EP1694958B1
EP1694958B1 EP04798002A EP04798002A EP1694958B1 EP 1694958 B1 EP1694958 B1 EP 1694958B1 EP 04798002 A EP04798002 A EP 04798002A EP 04798002 A EP04798002 A EP 04798002A EP 1694958 B1 EP1694958 B1 EP 1694958B1
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EP
European Patent Office
Prior art keywords
pressure
valve
valve element
housing
piston
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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
EP04798002A
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German (de)
French (fr)
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EP1694958A1 (en
Inventor
Holmer Slocinski
Stefan Schillinger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LOrange GmbH
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LOrange GmbH
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Publication of EP1694958A1 publication Critical patent/EP1694958A1/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
    • F02M63/02—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
    • 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
    • F02M63/02—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
    • F02M63/026—Means for reducing the pressure in common rails at power off

Definitions

  • valve member By coupling the valve member to a piston surface which is pressurizable to displace the valve member into the open position, the opening of the valve can be controlled independently of the fuel pressures to be controlled in the connected fuel assemblies and the design of the valve.
  • a surface of a pot-shaped piston which at the same time receives the spring loading the valve element in the direction of its locking position, is formed with a piston face which can be pressurized.
  • a provided with a pressure port ring volume is provided, which is bounded by an integrally formed on the cup-shaped piston, the piston surface forming annular flange.

Abstract

The invention concerns a pressure limiting valve (1) for fuel injection devices, in particular for fuel injection devices produced in the form of supply manifold systems. The inventive pressure limiting valve comprises a housing (2) including a high pressure connection (5) on the intake side, a backflow connection (9), as well as a flow connection located between said two connections and controlled by a valve element (7) which is guided mobile in the housing (2) and which is sealingly spring-biased towards a valve seat (6) on the intake side in the direction of its locking position. Said valve element opens, while being limited by a stop, via a high pressure applied on the intake side and its surfaces pressurized to counter the spring force are larger in the opening position releasing the flow connection than in the locking position. Since the valve element (7) is coupled, in terms of displacement, to a surface (17) of a piston (12) mobile in the housing (2), said surface being capable of being pressurized to move the valve element (7) in the opening position, it is possible in certain operating conditions, in particular when the engine is stopped for maintenance, to open the valve regardless of the dimensioning of the pressure limiting valve so as to reduce to a selectable predefined level the pressure in the connected fuel device.

Description

Die Erfindung betrifft ein Druckbegrenzungsventil für Kraftstoff-Einspritzeinrichtungen, insbesondere für als Common-Rail-Systeme ausgebildete Kraftstoff-Einspritzeinrichtungen von Brennkraftmaschinen gemäß dem oberbegriff des Anspruchs 1.The invention relates to a pressure limiting valve for fuel injection devices, in particular for designed as common rail fuel injection systems of internal combustion engines according to the preamble of claim 1.

Ein Druckbegrenzungsventil der vorgenannten Art geht beispielsweise aus der DE 101 15 162 C1 als bekannt hervor. Zur Steuerung einer zwischen einem eingangsseitigen Hochdruckanschluss und einem Rücklaufanschluss liegenden Durchflussverbindung dient ein nadelförmiges Ventilelement, das mit einem Schaft in der als Schiebeführung ausgebildeten Durchflussverbindung dichtend verschiebbar geführt ist und in Richtung auf seine Sperrlage federbelastet ist. Die Schiebeführung weist einen von der Ventilnadel übersteuerten, im Abstand zum Ventilsitz liegenden Anschlussquerschnitt für den Rücklauf auf. Das dargestellte Druckbegrenzungsventil erlaubt die Absteuerung von Kraftstoff aus einem Kraftstoffspeicher, wenn der Druck im Kraftstoffspeicher einen vorgegebenen Wert überschreitet. In verschiedenen Betriebszuständen ist es jedoch wünschenswert, den Druck im Kraftstoffspeicher unabhängig von einem durch die Auslegung des Ventils vorgegebenen Wert abzusenken, was mit dem dargestellten Druckbegrenzungsventil nicht möglich ist.A pressure relief valve of the aforementioned type is for example from the DE 101 15 162 C1 as known. For controlling a flow connection located between an input-side high-pressure connection and a return connection serves a needle-shaped valve element, which is guided in a sealingly displaceable manner with a shaft in the flow connection designed as a sliding guide and is spring-loaded in the direction of its blocking position. The sliding guide has a connection cross-section for the return, overridden by the valve needle and spaced from the valve seat. The pressure relief valve shown allows the control of fuel from a fuel tank when the pressure in the fuel tank exceeds a predetermined value. In various operating states, however, it is desirable to lower the pressure in the fuel reservoir independently of a predetermined by the design of the valve value, which is not possible with the illustrated pressure relief valve.

In der EP 1 314 883 A2 ist ein Druckbegrenzungsventil offenbart, das einerseits als Sicherheitsventil den Druck in einem Kraftstoffspeicher begrenzt und andererseits als pneumatisch betätigbares Spülventil die Zirkulation von Kraftstoff, insbesondere Schweröl, im Kraftstoffsystem nach einem Motorstopp ermöglicht. Dazu umfasst das Ventil ein mit einem Ventilkörper gekoppeltes topfförmiges Element, dessen Boden gegen die Kraft einer Feder mit Druck beaufschlagbar ist.In the EP 1 314 883 A2 is a pressure relief valve disclosed on the one hand limits the pressure in a fuel tank as a safety valve and on the other hand as a pneumatic operable purge valve allows the circulation of fuel, especially heavy oil, in the fuel system after engine stop. For this purpose, the valve comprises a cup-shaped element coupled to a valve body, the bottom of which can be subjected to pressure against the force of a spring.

Der im Patentanspruch 1 angegebenen Erfindung liegt das Problem zu Grunde, auf konstruktiv einfache Weise die Funktion des Druckbegrenzungsventils zu erweitern, so dass in bestimmten Betriebszuständen unabhängig von der Auslegung des Druckbegrenzungsventils das Ventil geöffnet werden kann, um den Druck in den verbundenen Kraftstoffeinrichtungen auf ein beliebig vorgebbares Niveau abzusenken.The specified in claim 1 invention is based on the problem of structurally simple way to expand the function of the pressure relief valve, so that in certain operating conditions, regardless of the design of the pressure relief valve, the valve can be opened to the pressure in the connected fuel devices to any Lowering predeterminable level.

Dieses Problem wird durch die im Patentanspruch 1 aufgeführten Merkmale gelöst. Durch Kopplung des Ventilelements mit einer Kolbenfläche, die zum Verschieben des Ventilelements in die Öffnungslage druckbeaufschlagbar ist, kann die Öffnung des Ventils unabhängig von den zu steuernden Kraftstoffdrücken in den verbundenen Kraftstoffeinrichtungen und der Auslegung des Ventils gesteuert werden. Dazu ist eine Fläche eines topfförmigen Kolbens, der zugleich die das Ventilelement in Richtung auf seine Sperrlage belastende Feder aufnimmt, mit einer druckbeaufschlagbaren Kolbenfläche ausgebildet. Auf der Außenseite des topfförmigen Kolbens ist ein mit einem Druckanschluss versehenes Ringvolumen vorgesehen, das von einem an dem topfförmigen Kolben angeformten, die Kolbenfläche bildenden Ringflansch begrenzt ist.This problem is solved by the features listed in claim 1. By coupling the valve member to a piston surface which is pressurizable to displace the valve member into the open position, the opening of the valve can be controlled independently of the fuel pressures to be controlled in the connected fuel assemblies and the design of the valve. For this purpose, a surface of a pot-shaped piston, which at the same time receives the spring loading the valve element in the direction of its locking position, is formed with a piston face which can be pressurized. On the outside of the pot-shaped piston, a provided with a pressure port ring volume is provided, which is bounded by an integrally formed on the cup-shaped piston, the piston surface forming annular flange.

Die mit der Erfindung erzielten Vorteile bestehen darin, dass in einfacher Weise eine Entlastung des Kraftstoffsystems vorgenommen werden kann. Eine Systementlastung ist beispielsweise notwendig, wenn im Rahmen der Wartung kraftstoffspeichernde Bauteile auszutauschen oder zu reparieren sind. Nicht zuletzt sind auch Notfälle denkbar, in denen durch eine Notentlastung eine sofortige Absenkung des Kraftstoffdrucks vorgenommen werden muss.The advantages achieved by the invention are that in a simple way, a discharge of the fuel system can be made. A system load is necessary, for example, if you need to replace or repair fuel-storing components during maintenance. Not least Emergencies are also conceivable in which an emergency lowering of the fuel pressure must be carried out immediately.

Gemäß Anspruch 2 erfolgt die Druckbeaufschlagung der Kolbenfläche mit Druckluft.According to claim 2, the pressurization of the piston surface is carried out with compressed air.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im Folgenden näher beschrieben.An embodiment of the invention is illustrated in the drawing and will be described in more detail below.

Die einzige Figur zeigt eine Querschnittsansicht des Druckbegrenzungsventils.The single figure shows a cross-sectional view of the pressure relief valve.

Mit der Bezugsziffer 1 ist das Druckbegrenzungsventil in seiner Gesamtheit bezeichnet und mit 2 dessen Gehäuse. Im Gehäuse 2 ist eine Bohrung 3 vorgesehen, die koaxial auf eine Bohrung 4 ausläuft, die mit einem Hochdruckanschluss 5 in Verbindung steht. Im Übergang der Bohrung 3 auf die Bohrung 4 liegt der Ventilsitz 6, der mit einer Ventilnadel 20 zusammenwirkt. Der Ventilsitz 6 ist in einer Ventilplatte 7 ausgebildet, die zwischen dem Gehäuse 3 und dem den Hochdruckanschluss 5 beinhaltenden Gehäuseteil 8 liegt. Die Ventilplatte 7 beinhaltet einen dem Ventilsitz 6 zugeordneten Ventilkegel, an dem die Ventilnadel 20 in der Sperrstellung mit ihrem abgerundeten Ende anliegt. Die Ventilnadel 20 besteht in einem kolbenförmigen Bauteil, das in der Bohrung 3 dichtend verschiebbar geführt ist, wobei ein auf den Rücklaufanschluss 9 radial ausmündender Anschlussquerschnitt 10 überdeckt wird, der im Abstand zum Ventilsitz 6 liegt und von der Ventilnadel 20 übersteuerbar ist. Um die Ventilnadel 20 in Sperrlage zu halten, dient eine vorgespannte Feder 11, die im Innern eines topfförmigen Kolbens 12 angeordnet ist. Die Feder 11 wird zwischen einem Federteller 14 und dem zum Kolben 12 gehörigen Kolbenboden 13 auf Vorspannung gehalten. Zur Justierung der gewünschten Federkraft dient eine Einstellschraube 15, die am Federteller 14 angreift. Der topfförmige Kolben 12 ist mit einem Flansch 16 ausgebildet, der eine Kolbenfläche 17 beinhaltet, die ein Ringvolumen 18 auf der Außenseite des topfförmigen Kolbens 12 begrenzt, das mit einem Druckluftanschluss 19 verbunden ist.The reference numeral 1, the pressure relief valve is indicated in its entirety and with its housing 2. In the housing 2, a bore 3 is provided which terminates coaxially on a bore 4, which communicates with a high pressure port 5 in connection. In the transition of the bore 3 to the bore 4 is the valve seat 6, which cooperates with a valve needle 20. The valve seat 6 is formed in a valve plate 7, which lies between the housing 3 and the housing part 8 containing the high-pressure port 5. The valve plate 7 includes a valve seat associated with the valve cone 6, against which the valve needle 20 rests in the blocking position with its rounded end. The valve needle 20 consists of a piston-shaped component, which is guided sealingly displaceably in the bore 3, wherein a connection cross-section 10 which opens radially outward onto the return connection 9 is covered, which lies at a distance from the valve seat 6 and can be overridden by the valve needle 20. In order to keep the valve needle 20 in the locked position, a prestressed spring 11, which is arranged in the interior of a cup-shaped piston 12, is used. The spring 11 is held between a spring plate 14 and the piston 12 associated with the piston head 13 to bias. For adjusting the desired spring force is an adjusting screw 15 which engages the spring plate 14. The pot-shaped piston 12 is formed with a flange 16 which includes a piston surface 17 defining an annular volume 18 on the outside of the cup-shaped piston 12, which is connected to a compressed air port 19.

Die Feder und die Flächenverhältnisse sind in bekannter Weise so ausgelegt, dass das Druckbegrenzungsventil öffnet, wenn in den angeschlossenen Kraftstoffeinrichtungen ein Druckwert erreicht wird, der über einem festgelegten Maximalwert liegt. Zum Öffnen wird die Düsennadel 20 unter Kompression der Feder 11 verschoben, bis der von der Düsennadel 20 übersteuerte Anschlussquerschnitt 10 freigegeben wird und durch Absteuerung eine Absenkung des Kraftstoffdrucks in den verbundenen Kraftstoffeinrichtungen, beispielsweise einem Druckspeicher für Kraftstoff, erfolgt. Wird ein durch die Auslegung des Ventils vorgegebener minimaler Grenzdruck erreicht, wird über die Kraft der Feder 11 das Druckbegrenzungsventil wieder geschlossen. Öffnungs- und Schließdruck sind unterschiedlich, weil die entgegen der Federkraft druckbeaufschlagte Fläche der Ventilnadel 20 in der die Durchflussverbindung freigebenden Öffnungslage größer gewählt ist als in der Sperrlage. Dadurch lässt sich unerwünschtes Pendeln des Ventilelements 20 bei geringen Druckschwankungen verhindern.The spring and the area ratios are designed in a known manner so that the pressure relief valve opens when a pressure value is reached in the connected fuel devices, which is above a predetermined maximum value. To open the nozzle needle 20 is displaced under compression of the spring 11 until the over-actuated from the nozzle needle 20 connection cross-section 10 is released and by lowering a lowering of the fuel pressure in the connected fuel devices, such as a pressure accumulator for fuel occurs. If a predetermined by the design of the valve minimum limit pressure is reached, the pressure relief valve is closed again via the force of the spring 11. Opening and closing pressures are different because the surface of the valve needle 20 which is pressurized against the spring force is chosen to be larger in the opening position which releases the flow connection than in the blocking position. As a result, unwanted oscillation of the valve element 20 can be prevented at low pressure fluctuations.

Unabhängig vom Druck in den mit dem Druckbegrenzungsventil 1 verbundenen Kraftstoffeinrichtungen kann eine Druckabsenkung im mit dem Druckbegrenzungsventil 1 verbundenen Kraftstoffsystem durch Druckbeaufschlagung des Ringvolumens 18 erfolgen. Wird das Ringvolumen 18 über den Druckluftanschluss 19 mit Druckluft beaufschlagt, wirkt an der Kolbenfläche 17 ein Druck, der den Kolben 12 unter Kompression der Feder 11 in Öffnungsrichtung verschiebt, wobei die Ventilnadel 20 mitgenommen wird bzw. durch den anliegenden Kraftstoffdruck nachgeführt wird und den Durchgang zum Anschlussquerschnitt 10 freigibt. Auf diese Weise kann in beliebigen Betriebszuständen auf Notsituationen reagiert werden und eine Druckabsenkung in den Kraftstoffeinrichtungen über den Rücklaufanschluss 9 herbeigeführt werden. Insbesondere kann die Einrichtung dazu genutzt werden, um eine Systementlastung bei der Wartung bei abgestelltem Motor vorzunehmen.Independently of the pressure in the fuel devices connected to the pressure limiting valve 1, a pressure reduction in the fuel system connected to the pressure limiting valve 1 can take place by pressurizing the annular volume 18. If the annular volume 18 is acted upon by the compressed air connection 19 with compressed air, acts on the piston surface 17, a pressure which moves the piston 12 under compression of the spring 11 in the opening direction, wherein the valve needle 20 taken is or is tracked by the applied fuel pressure and the passage to the connection section 10 releases. In this way, it is possible to react to emergency situations in any operating conditions and to bring about a pressure reduction in the fuel devices via the return connection 9. In particular, the device can be used to undertake a system load during maintenance with the engine off.

In dem erfindungsgemäßen Ventil ist mit einfachen konstruktiven Mitteln eine weitere Funktion integriert, so dass der Anwendungsbereich des Druckbegrenzungsventils 1 erweitert wurde. In the valve according to the invention, a further function is integrated with simple constructive means, so that the field of application of the pressure limiting valve 1 has been extended.

Claims (2)

  1. Pressure-limiting valve (1) for fuel injection devices, in particular for fuel injection devices embodied as common rail systems, having a housing (2) with an inlet-side high-pressure port (5), with a return flow port (9) and with a throughflow connection situated between said high-pressure port (5) and return flow port (9), which throughflow connection is controlled by means of a valve element (7) which is guided in a movable fashion in the housing (2) and which is springloaded in a sealing fashion in the direction of its blocking position towards an inlet-side valve seat (6), which valve element (7) is also openable, in a manner limited by a stop, by means of an applied high pressure, and the faces, which are loaded with pressure counter to the spring force, of said valve element (7) are larger in the open position, which opens the throughflow connection, than in the blocking position, with the valve element (20) being coupled in terms of movement to a piston face (17) of a piston (12) which is movable in the housing (2) and which can be loaded with pressure in order to move the valve element (20) into the open position, with the pressure-loaded piston face (17) being formed on a pot-shaped piston (12) which, on its inner side, holds the spring (11) which loads the valve element (20) in the direction of its blocking position and which is supported at one side against the pot base (13) and at the other side against the housing (2),
    characterized
    in that an annular volume (18) which is arranged on the outer side of the pot-shaped piston (12) and which is provided with a pressure port (19) is provided in the housing (2), which annular volume (18) is delimited axially by an annular flange (16) which is integrally formed on the pot-shaped piston (12) and which constitutes an annular piston face (17) which can be loaded with pressure.
  2. Pressure-limiting valve according to Claim 1,
    characterized
    in that the pressure-loading of the piston face (17) takes place with compressed air.
EP04798002A 2003-11-24 2004-11-19 Pressure limiting valve for fuel injection devices Active EP1694958B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10355124A DE10355124B4 (en) 2003-11-24 2003-11-24 Pressure relief valve for fuel injectors
PCT/EP2004/013142 WO2005054663A1 (en) 2003-11-24 2004-11-19 Pressure limiting valve for fuel injection devices

Publications (2)

Publication Number Publication Date
EP1694958A1 EP1694958A1 (en) 2006-08-30
EP1694958B1 true EP1694958B1 (en) 2008-03-26

Family

ID=34638188

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04798002A Active EP1694958B1 (en) 2003-11-24 2004-11-19 Pressure limiting valve for fuel injection devices

Country Status (4)

Country Link
EP (1) EP1694958B1 (en)
AT (1) ATE390556T1 (en)
DE (1) DE10355124B4 (en)
WO (1) WO2005054663A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007016134A1 (en) * 2006-04-25 2007-11-08 Robert Bosch Gmbh High pressure fuel pump, has throttle arrangement provided at high pressure side of valve seat of pressure limiting valve, where cross section of arrangement is approximately equal to desired maximum opening cross section of valve
DE102010021964A1 (en) 2010-05-28 2011-12-01 Poppe & Potthoff Gmbh Pressure relief valve, particularly for limiting fluid pressure in distribution pipe, has radial outflow channel connected with bore portion via axial channel which is formed as axial bore
AT511252B1 (en) * 2011-04-08 2013-10-15 Bosch Gmbh Robert FLUSH VALVE FOR COMMON-RAIL HEAVY-OIL INJECTION SYSTEMS
WO2017032917A1 (en) * 2015-08-26 2017-03-02 Wärtsilä Finland Oy Safety valve arrangement

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI107830B (en) * 1998-06-08 2001-10-15 Waertsilae Tech Oy Ab Control and safety valve device in a fuel supply system
DE19852409A1 (en) * 1998-11-13 2000-05-18 Hydraulik Ring Gmbh Pressure relief valve, especially for vehicles
DE10115162C1 (en) * 2001-03-27 2002-10-02 Orange Gmbh Pressure relief valve for fuel injectors
DE10157135B4 (en) * 2001-11-21 2004-03-11 Man B & W Diesel Ag Fuel supply system in the form of a common rail system of an internal combustion engine with several cylinders

Also Published As

Publication number Publication date
EP1694958A1 (en) 2006-08-30
DE10355124B4 (en) 2005-09-22
ATE390556T1 (en) 2008-04-15
WO2005054663A1 (en) 2005-06-16
DE10355124A1 (en) 2005-07-21

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