EP2664783A1 - Pressure maintenance valve for a fuel line - Google Patents

Pressure maintenance valve for a fuel line Download PDF

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Publication number
EP2664783A1
EP2664783A1 EP20130156745 EP13156745A EP2664783A1 EP 2664783 A1 EP2664783 A1 EP 2664783A1 EP 20130156745 EP20130156745 EP 20130156745 EP 13156745 A EP13156745 A EP 13156745A EP 2664783 A1 EP2664783 A1 EP 2664783A1
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EP
European Patent Office
Prior art keywords
closing body
spring
pressure
fuel
fluid
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Granted
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EP20130156745
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German (de)
French (fr)
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EP2664783B1 (en
Inventor
Isa Cöl
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Veritas AG
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Veritas AG
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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46—Valves
    • F02M59/462—Delivery valves
    • 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
    • F02M63/0054—Check valves
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/877—With flow control means for branched passages

Definitions

  • the present invention relates to a pressure maintenance valve arrangement for a fuel line.
  • the injection valves of the internal combustion engine are supplied with fuel via a common fuel line (common rail system). Fuel that is not supplied to the engine via the respective injectors is collected in a common fuel return line and returned to a fuel supply line.
  • common fuel line common rail system
  • a fuel pressure is maintained in the fuel return line via a pressure-holding valve.
  • the fuel return line is filled with fuel.
  • the publication DE 103 39 250 A1 describes a pressure holding valve that can be used to maintain a fuel pressure in a fuel line as well as to fill the fuel line.
  • the present invention is based on the recognition that the structure of conventional pressure holding valves is complicated and error prone.
  • the object according to the invention is achieved by a pressure-retaining valve arrangement for a fuel line, with a fluid main section which can be closed by means of a first spring-loaded closing body for maintaining a fuel pressure in the fuel line; wherein the first closing body comprises a closing body head for sealing the main fluid path, which can be pressed by means of a spring force against a sealing seat, a fluid secondary line which is formed to fill the fuel line with fuel in the first spring-loaded closing body; and a second spring-loaded closing body, which is provided for closing the fluid by-pass.
  • the technical advantage is achieved, for example, that the main fluid path can be reliably closed and improves the functionality of the pressure holding valve assembly.
  • the pressure holding valve arrangement according to the invention a particularly compact design of the pressure holding valve.
  • the fluid secondary section is formed as an axial bore through the first spring-loaded closing body.
  • the first spring-loaded closing body comprises a cylindrical shaft which merges into the closing body head, and a spring which surrounds the cylindrical shaft and on which the closing body head acts.
  • the closing body head has a rotationally symmetrical mushroom shape.
  • the fluid secondary section comprises a sealing seat for receiving the second spring-loaded closing body.
  • an outer wall of the first spring-loaded closing body comprises at least one axial guide for guiding fuel.
  • the second spring-loaded closing body is formed by a sealing ball.
  • a spring is provided in order to act on the second spring-loaded closing body for closing the fluid by-pass.
  • the main fluid path and the secondary fluid path are formed in a housing and the first spring-loaded closing body and the second spring-loaded closing body are arranged axially displaceable in the housing.
  • a spring force acting on the first closing body is less than a spring force acting on the second closing body.
  • the main fluid path runs along an outer wall of the first spring-loaded closing body.
  • a funnel-shaped sealing seat for the second spring-loaded closing body is formed in the closing body head.
  • the closing body head has a sealing surface with respect to a wall. This will For example, the technical advantage achieved that a particularly reliable seal is made possible by the sealing surface.
  • a plurality of axial guides are provided on the first closing body.
  • the secondary fluid path runs through the first closing body.
  • Fig. 1 shows a cross-sectional view of an embodiment of the pressure-holding valve assembly 100.
  • the pressure-holding valve assembly 100 is connected to a fuel line 101, runs through the unburned fuel from an internal combustion engine, not shown, in a fuel circuit. This fuel line 101 is also called leak oil line for this reason.
  • the pressure holding valve assembly 100 serves to maintain a pressure in the fuel line 101.
  • the pressure holding valve assembly 100 is adapted to keep the pressure in the return from an internal combustion engine with piezo injectors in a common rail system constant, so that the function of the piezo injectors is maintained and pressure fluctuations are prevented at the injection nozzles.
  • a common rail system refers to a diesel direct-injection internal combustion engine, in which all cylinders are located on a common distribution line for the fuel. In this distribution line, a permanently high pressure is generated, the fuel stored and distributed to the regulated injection nozzles.
  • the advantages of the common rail system are better mixture formation in the cylinders, lower fuel consumption and lower emissions.
  • the pressure holding valve arrangement 100 comprises a fluid main section 103 through which the fuel flows in the direction of the arrow when a predetermined pressure is exceeded.
  • the fuel line can be closed by means of a closing member 105 loaded with a helical compression spring 115 to maintain a fuel pressure. If the pressure in the fuel line 101 exceeds a set value, the closing body 105 moves axially to the side and clears the path for the fuel located in the fuel line 101 so that it can flow out of the fuel line 101. The pressure in the fuel line 101 is reduced until the desired value is reached again.
  • the spring-loaded closing body 105 thus serves to maintain and stabilize the pressure in the fuel line 101.
  • the rotationally symmetrical closing body 105 has a closing body head 107 and a cylindrical shaft 113 against which the spring 115 rests.
  • the spring 115 exerts a force on the closing body head 107, which presses it into the sealing seat 117.
  • the closing body head 107 of the closing body 105 serves to close the fluid main section 103.
  • the fuel pressure required to open the fluid main section 103 is determined by the spring constant and the prestressing of the spring 115.
  • the sealing seat 117 has a cup-shaped recess, on the side wall of the closing body head 107 rests in the closed state.
  • the pressure-retaining valve arrangement 100 comprises a fluid secondary section 109, which is formed to fill the fuel line 101 with fuel in the spring-loaded closing body 105.
  • a fluid secondary section 109 which is formed to fill the fuel line 101 with fuel in the spring-loaded closing body 105.
  • To close the fluid by-pass serves a ball 111 as a further closing body.
  • the ball 111 In a movement of the larger closing body 105 due to an overpressure in the fuel line 101, the ball 111 is held both by the pressure of the fuel and by a spring 119 in a funnel-shaped recess within the closing body 105. The fuel flows around the closing body 105 in this case.
  • the first or refilling with fuel takes place in a filling direction, which is opposite to the arrow direction, which indicates the main flow direction of the fuel during operation of the internal combustion engine.
  • the fuel acts as a fluid with a pressure on the closing body 105 in the fluid main section 103 and thus seals off the passage.
  • the fuel acts with the same pressure on the ball 111 and opens the fluid secondary section 109. If the pressure exceeds a predetermined pressure, such as an opening pressure of 0.6 bar, the filling of the fuel line 101 takes place.
  • the pressure required to open the fluid by-pass 109 is determined by the spring 119.
  • the pressure-retaining valve arrangement 100 thus comprises two fluidically arranged valves, one of which opens in the direction of the fuel line 101 and the other opens in the direction of a supply line, so that two directions of flow can be realized at different pressures.
  • the pressure holding valve assembly 100 is formed by recesses in the two mold parts 121 and 123.
  • the two mold parts 121 and 123 have, for example, a cylindrical shape, in the middle of which there is a recess for receiving the springs 115 and 119 and the closing bodies 105 and 111.
  • the pressure holding valve arrangement 100 is therefore formed by the interaction of the two mold parts 121 and 123.
  • the molded part 121 comprises a recess for the sealing seat 117 of the closing body 105.
  • the molded part 123 comprises a cylindrical recess for the spring 115.
  • springs 115 and 119 coil springs can be used, which are wound from spring wire cylindrical, conical or barrel-shaped.
  • the wire cross-section of the springs is subjected to torsion under load.
  • the spring constant is determined by the properties of the spring wire used.
  • the spring characteristic and the spring constant can be adapted by ranges of variable wire diameter, variable pitch or varying spring diameter, such as in a frusto-conical coil spring.
  • the two mold parts 121 and 123 may have any other shape and be interconnected in any manner, such as being welded together.
  • a one-piece molding can also be used.
  • the two mold parts 121 and 123 are arranged in two housing parts 125 and 127 which completely surround them and have connections for the fuel line 101 and the supply line.
  • the two housing parts 125 and 127 may be screwed together.
  • one of the housing parts 125 comprise a male thread, not shown, and the other of the housing parts 127 comprise an internal thread, which can be rotated into one another.
  • a circumferential seal 129 is arranged, which prevents fuel from the interior of the pressure retaining valve assembly 100 passes to the outside.
  • each of the molded part 121 and the housing part 127 and between the molded part 123 and the housing part 125 further seals 131 and 133, such as sealing rings, arranged, which also prevent the escape of fuel.
  • the two housing parts 125 and 127 may have any other suitable shape and be interconnected in any manner, such as being welded together.
  • the housing of the pressure-holding valve arrangement 100 has two connections which serve to connect the pressure-holding valve arrangement 100 to the fuel line 101, so that the fuel can flow through the pressure-retaining valve arrangement 100 in the presence of an overpressure.
  • the mold members 121 and 123 and the housing members 125 and 127 may be formed in other ways.
  • the mold parts 121 and 123 may be fused to the housing parts 125 and 127 so that they form a single coherent component.
  • the mold parts 121 and 123 and the housing parts 125th and 127 may be injection molded from suitable thermoplastics. Particularly advantageous is the use of fiber-reinforced plastics, since they have a particularly high strength and pressure resistance.
  • Fig. 2 shows a side view of the closing body 105.
  • the closing body 105 has a cylindrical shaft 113, at the end of the closing body head 107 is formed.
  • a sealing surface 203 is formed, which rests against a wall in the closed state of the fluid main section 103 and thus blocks the fluid main section 103.
  • the sealing surface 203 may be provided with a sealing material.
  • the closing body 105 comprises along its surface eight guide blades 201 and 207, which channel the fuel when flowing past.
  • segment-shaped recesses 209 are formed between the guide plates 201 and 207.
  • the closing body 105 may also have a different number of guide blades 201 and 207.
  • Fig. 3 shows a cross-sectional view of the closing body 105.
  • the cross-sectional view extends through two of the guide plates 201 and 207.
  • a cylindrical channel which forms the fluid secondary section 109.
  • a funnel-shaped recess 205 which is connected to the cylindrical channel and serves to receive the ball 111.
  • the recess 205 may be lined with a sealing material.
  • the funnel-shaped recess 205 has the advantage that the ball 111 is self-centered in this and so a good seal of the fluid secondary section 109 is achieved.
  • the recess 205 may have a different shape, such as cup-shaped.
  • the sealing surface 203 is bulged on the rest of the closing body head 107, so that they can effectively close the fluid main section 103.
  • a not-shown filter element or a sieve may be arranged in the channel of the fluid sub-section 109, which serves to clean the fuel when filling the fuel line 101.
  • Fig. 4 shows a perspective view of the closing body 105 with the guide blades 201 and 207 and the funnel-shaped recess 205.
  • the closing body 105 may for example, be made of thermoplastic material by injection molding. In general, however, all other materials that are suitable for the production of the closing body can also be used.
  • the shape of the closing body 105 used may differ from that shown in the figures.
  • pressure holding valve assemblies described and illustrated are generally applicable to a fuel injector of an internal combustion engine or to control the flow of other fluids.

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  • 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 pressure control valve system (100) has a main fuel line (103) which is closed with a spring-loaded sealing structure (105) for maintaining a fuel pressure in a fuel line (101). The sealing structure is comprised of a sealing structure head (107) for sealing the main fuel line, by pressing the sealing structure with spring force against a sealing seat (117). An auxiliary fuel line (109) is formed in the spring-loaded sealing structure for filling the fuel line with fuel. The spring-loaded sealing structure (111) is provided for sealing the auxiliary fuel line.

Description

Die vorliegende Erfindung betrifft eine Druckhalteventilanordnung für eine Kraftstoffleitung.The present invention relates to a pressure maintenance valve arrangement for a fuel line.

In modernen Verbrennungsmotoren werden die Einspritzventile des Verbrennungsmotors über eine gemeinsame Kraftstoffleitung mit Kraftstoff versorgt (Common Rail System). Kraftstoff, der dem Verbrennungsmotor nicht über die jeweiligen Einspritzventile zugeführt wird, wird in einer gemeinsamen Kraftstoffrücklaufleitung gesammelt und erneut einer Kraftstoffzuleitung zugeführt.In modern internal combustion engines, the injection valves of the internal combustion engine are supplied with fuel via a common fuel line (common rail system). Fuel that is not supplied to the engine via the respective injectors is collected in a common fuel return line and returned to a fuel supply line.

Um die Funktion der Einspritzventile zu gewährleisten, wird in der Kraftstoffrücklaufleitung über ein Druckhalteventil ein Kraftstoffdruck aufrechterhalten. Vor einem erstmaligen Betrieb des Verbrennungsmotors wird die Kraftstoffrücklaufleitung mit Kraftstoff befüllt.In order to ensure the function of the injection valves, a fuel pressure is maintained in the fuel return line via a pressure-holding valve. Before a first operation of the internal combustion engine, the fuel return line is filled with fuel.

Die Druckschrift DE 103 39 250 A1 beschreibt ein Druckhalteventil, das zum Aufrechterhalten eines Kraftstoffdruckes in einer Kraftstoffleitung als auch zum Befüllen der Kraftstoffleitung verwendet werden kann.The publication DE 103 39 250 A1 describes a pressure holding valve that can be used to maintain a fuel pressure in a fuel line as well as to fill the fuel line.

Es ist die der Erfindung zugrundeliegende Aufgabe, den Aufbau eines Druckhalteventils zu vereinfachen.It is the object underlying the invention to simplify the construction of a pressure holding valve.

Diese Aufgabe wird durch einen Gegenstand mit den Merkmalen nach dem unabhängigen Anspruch gelöst. Vorteilhafte Ausführungsformen sind Gegenstand der abhängigen Ansprüche, der Beschreibung und der Figuren.This object is achieved by an article having the features according to the independent claim. Advantageous embodiments are the subject of the dependent claims, the description and the figures.

Die vorliegende Erfindung beruht auf der Erkenntnis, dass der Aufbau herkömmlicher Druckhalteventile kompliziert und fehleranfällig ist.The present invention is based on the recognition that the structure of conventional pressure holding valves is complicated and error prone.

Gemäß einem Aspekt wird die erfindungsgemäße Aufgabe durch eine Druckhalteventilanordnung für eine Kraftstoffleitung gelöst, mit einer Fluidhauptstrecke, die mittels eines ersten federbelasteten Schließkörpers zum Aufrechterhalten eines Kraftstoffdruckes in der Kraftstoffleitung schließbar ist; wobei der erste Schließkörper einen Schließkörperkopf zum Abdichten der Fluidhauptstrecke umfasst, der mittels einer Federkraft gegen einen Dichtsitz anpressbar ist, einer Fluidnebenstrecke, die zum Befüllen der Kraftstoffleitung mit Kraftstoff in dem ersten federbelasteten Schließkörper gebildet ist; und einem zweiten federbelasteten Schließkörper, der zum Schließen der Fluidnebenstrecke vorgesehen ist. Dadurch wird beispielsweise der technische Vorteil erreicht, dass die Fluidhauptstrecke zuverlässig verschlossen werden kann und sich die Funktionsfähigkeit der Druckhalteventilanordnung verbessert. Daneben lässt sich durch die erfindungsgemäße Druckhalteventilanordnung eine besonders kompakte Bauform des Druckhalteventils realisieren.According to one aspect, the object according to the invention is achieved by a pressure-retaining valve arrangement for a fuel line, with a fluid main section which can be closed by means of a first spring-loaded closing body for maintaining a fuel pressure in the fuel line; wherein the first closing body comprises a closing body head for sealing the main fluid path, which can be pressed by means of a spring force against a sealing seat, a fluid secondary line which is formed to fill the fuel line with fuel in the first spring-loaded closing body; and a second spring-loaded closing body, which is provided for closing the fluid by-pass. As a result, the technical advantage is achieved, for example, that the main fluid path can be reliably closed and improves the functionality of the pressure holding valve assembly. In addition, can be realized by the pressure holding valve arrangement according to the invention a particularly compact design of the pressure holding valve.

In einer vorteilhaften Ausführungsform der Druckhalteventilanordnung ist die Fluidnebenstrecke als eine axiale Bohrung durch den ersten federbelasteten Schließkörper gebildet. Dadurch wird beispielsweise der technische Vorteil erreicht, dass sich eine gerade Strecke zum Befüllen der Kraftstoffleitung realisieren lässt.In an advantageous embodiment of the pressure-retaining valve arrangement, the fluid secondary section is formed as an axial bore through the first spring-loaded closing body. As a result, for example, the technical advantage is achieved that can realize a straight line for filling the fuel line.

In einer weiteren vorteilhaften Ausführungsform der Druckhalteventilanordnung umfasst der erste federbelastete Schließkörper einen zylindrischen Schaft, der in den Schließkörperkopf übergeht, und eine Feder, die den zylindrischen Schaft umgibt und auf den der Schließkörperkopf einwirkt. Dadurch wird beispielsweise der technische Vorteil erreicht, dass der Aufbau des Druckhalteventils vereinfacht wird. Durch die zylindrische Form des Schaftes wird ein Verkanten des Schließkörpers verhindert.In a further advantageous embodiment of the pressure-retaining valve arrangement, the first spring-loaded closing body comprises a cylindrical shaft which merges into the closing body head, and a spring which surrounds the cylindrical shaft and on which the closing body head acts. As a result, for example, the technical advantage is achieved that the structure of the pressure-holding valve is simplified. Due to the cylindrical shape of the shaft tilting of the closing body is prevented.

In einer weiteren vorteilhaften Ausführungsform der Druckhalteventilanordnung weist der Schließkörperkopf eine rotationsymmetrische Pilzform auf. Dadurch wird beispielsweise der technische Vorteil erreicht, dass der Schließkörperkopf die Fluidhauptstrecke besonders gut abdichtet.In a further advantageous embodiment of the pressure-retaining valve arrangement, the closing body head has a rotationally symmetrical mushroom shape. As a result, for example, the technical advantage is achieved that the closing body head seals the fluid main section particularly well.

In einer weiteren vorteilhaften Ausführungsform der Druckhalteventilanordnung umfasst die Fluidnebenstrecke einen Dichtsitz für die Aufnahme des zweiten federbelasteten Schließkörpers. Dadurch wird beispielsweise der technische Vorteil erreicht, dass sich eine besonders kompakte Bauform ergibt.In a further advantageous embodiment of the pressure-retaining valve arrangement, the fluid secondary section comprises a sealing seat for receiving the second spring-loaded closing body. As a result, for example, the technical advantage is achieved that results in a particularly compact design.

In einer weiteren vorteilhaften Ausführungsform der Druckhalteventilanordnung umfasst eine Außenwandung des ersten federbelasteten Schließkörpers zumindest eine axiale Führung zum Führen von Kraftstoff. Dadurch wird beispielsweise der technische Vorteil erreicht, dass sich die Strömung und der Durchsatz des Kraftstoffes verbessern.In a further advantageous embodiment of the pressure-retaining valve arrangement, an outer wall of the first spring-loaded closing body comprises at least one axial guide for guiding fuel. As a result, the technical advantage is achieved, for example, that improve the flow and the throughput of the fuel.

In einer weiteren vorteilhaften Ausführungsform der Druckhalteventilanordnung ist der zweite federbelastete Schließkörper durch eine Dichtkugel gebildet. Dadurch wird beispielsweise der technische Vorteil erreicht, dass ein besonders einfach herzustellender Schließkörper verwendet wird.In a further advantageous embodiment of the pressure-retaining valve arrangement, the second spring-loaded closing body is formed by a sealing ball. As a result, the technical advantage is achieved, for example, that a particularly easy-to-produce closing body is used.

In einer weiteren vorteilhaften Ausführungsform der Druckhalteventilanordnung ist eine Feder vorgesehen, um auf den zweiten federbelasteten Schließkörper zum Schließen der Fluidnebenstrecke einzuwirken. Dadurch wird beispielsweise der technische Vorteil erreicht, dass eine Kraft zum Schließen der Fluidhauptstrecke direkt auf den Schließkörperkopf ausgeübt werden kann.In a further advantageous embodiment of the pressure-holding valve arrangement, a spring is provided in order to act on the second spring-loaded closing body for closing the fluid by-pass. As a result, for example, the technical advantage is achieved that a force for closing the fluid main section can be exerted directly on the closing body head.

In einer weiteren vorteilhaften Ausführungsform der Druckhalteventilanordnung sind die Fluidhauptstrecke sowie die Fluidnebenstrecke in einem Gehäuse gebildet und der erste federbelastete Schließkörper und der zweite federbelastete Schließkörper sind axial verschiebbar in dem Gehäuse angeordnet. Dadurch wird beispielsweise ebenfalls der technische Vorteil erreicht, dass sich eine besonders kompakte Bauform des Druckhalteventils realisieren lässt.In a further advantageous embodiment of the pressure retaining valve arrangement, the main fluid path and the secondary fluid path are formed in a housing and the first spring-loaded closing body and the second spring-loaded closing body are arranged axially displaceable in the housing. As a result, the technical advantage is achieved, for example, that a particularly compact design of the pressure relief valve can be realized.

In einer weiteren vorteilhaften Ausführungsform der Druckhalteventilanordnung ist eine auf den ersten Schließkörper einwirkende Federkraft geringer als eine auf den zweiten Schließkörper einwirkende Federkraft. Dadurch wird beispielsweise der technische Vorteil erreicht, dass sich die Kraftstoffleitung bei einem niedrigen Kraftstoffdruck befüllen lässt.In a further advantageous embodiment of the pressure-retaining valve arrangement, a spring force acting on the first closing body is less than a spring force acting on the second closing body. As a result, for example, the technical advantage is achieved that the fuel line can be filled at a low fuel pressure.

In einer weiteren vorteilhaften Ausführungsform der Druckhalteventilanordnung verläuft die Fluidhauptstrecke entlang einer Außenwandung des ersten federbelasteten Schließkörpers. Dadurch wird beispielsweise der technische Vorteil erreicht, dass die Kraftstoffströmung laminar entlang der Oberfläche verläuft.In a further advantageous embodiment of the pressure-retaining valve arrangement, the main fluid path runs along an outer wall of the first spring-loaded closing body. As a result, for example, the technical advantage is achieved that the fuel flow runs laminar along the surface.

In einer weiteren vorteilhaften Ausführungsform der Druckhalteventilanordnung ist in dem Schließkörperkopf ein trichterförmiger Dichtsitz für den zweiten federbelasteten Schließkörper gebildet. Dadurch wird beispielsweise der technische Vorteil erreicht, dass sich die Fluidnebenstreckt besonders zuverlässig abdichten lässt.In a further advantageous embodiment of the pressure-retaining valve arrangement, a funnel-shaped sealing seat for the second spring-loaded closing body is formed in the closing body head. As a result, the technical advantage, for example, is achieved that the fluid can be sealed off particularly reliably.

In einer weiteren vorteilhaften Ausführungsform der Druckhalteventilanordnung weist der Schließkörperkopf eine Dichtfläche gegenüber einer Wandung auf. Dadurch wird beispielsweise der technische Vorteil erreicht, dass durch die Dichtfläche eine besonders zuverlässige Abdichtung ermöglicht wird.In a further advantageous embodiment of the pressure-retaining valve arrangement, the closing body head has a sealing surface with respect to a wall. This will For example, the technical advantage achieved that a particularly reliable seal is made possible by the sealing surface.

In einer weiteren vorteilhaften Ausführungsform der Druckhalteventilanordnung sind an dem ersten Schließkörper eine Mehrzahl von axialen Führungen vorgesehen. Dadurch wird beispielsweise der technische Vorteil erreicht, dass sich die Strömung um den Schließkörper herum noch weiter verbessert.In a further advantageous embodiment of the pressure-retaining valve arrangement, a plurality of axial guides are provided on the first closing body. As a result, for example, the technical advantage is achieved that the flow around the closing body around even further improved.

In einer weiteren vorteilhaften Ausführungsform der Druckhalteventilanordnung verläuft die Fluidnebenstrecke durch den ersten Schließkörper hindurch. Dadurch wird beispielsweise der technische Vorteil erreicht, dass der Bauraum des Ventils verringert wird. Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und werden im Folgenden näher beschrieben.In a further advantageous embodiment of the pressure-retaining valve arrangement, the secondary fluid path runs through the first closing body. As a result, for example, the technical advantage is achieved that the installation space of the valve is reduced. Embodiments of the invention are illustrated in the drawings and will be described in more detail below.

Es zeigen:

Fig. 1
eine Querschnittsansicht einer Druckhalteventilanordnung;
Fig. 2
eine Ansicht eines Schließkörpers;
Fig. 3
eine Querschnittsansicht des Schließkörpers; und
Fig. 4
eine perspektivische Ansicht des Schließkörpers.
Show it:
Fig. 1
a cross-sectional view of a pressure holding valve assembly;
Fig. 2
a view of a closing body;
Fig. 3
a cross-sectional view of the closing body; and
Fig. 4
a perspective view of the closing body.

Fig. 1 zeigt eine Querschnittsansicht einer Ausführungsform der Druckhalteventilanordnung 100. Die Druckhalteventilanordnung 100 ist mit einer Kraftstoffleitung 101 verbunden, über die unverbrannter Kraftstoff von einem nicht gezeigten Verbrennungsmotor in einen Kraftstoffkreislauf zurückläuft. Diese Kraftstoffleitung 101 wird aus diesem Grund auch Leckölleitung genannt. Die Druckhalteventilanordnung 100 dient zum Aufrechterhalten eines Druckes in der Kraftstoffleitung 101. Fig. 1 shows a cross-sectional view of an embodiment of the pressure-holding valve assembly 100. The pressure-holding valve assembly 100 is connected to a fuel line 101, runs through the unburned fuel from an internal combustion engine, not shown, in a fuel circuit. This fuel line 101 is also called leak oil line for this reason. The pressure holding valve assembly 100 serves to maintain a pressure in the fuel line 101.

Insbesondere ist die Druckhalteventilanordnung 100 geeignet, den Druck im Rücklauf von einem Verbrennungsmotor mit Piezo-Einspritzventilen in einem Common Rail-System konstant zu halten, so dass die Funktion der Piezo-Einspritzventile aufrechterhalten wird und Druckschwankungen an den Einspritzdüsen verhindert werden. Ein Common Rail-System bezeichnet einen Diesel-Direkteinspritzer-Verbrennungsmotor, bei dem alle Zylinder an einer gemeinsamen Verteilerleitung für den Kraftstoff liegen. In dieser Verteilerleitung wird ein permanent hoher Druck erzeugt, der Kraftstoff gespeichert und an die geregelten Einspritzdüsen verteilt. Die Vorteile des Common Rail Systems sind bessere Gemischbildungen in den Zylindern, weniger Verbrauch und niedrigere Emissionen.In particular, the pressure holding valve assembly 100 is adapted to keep the pressure in the return from an internal combustion engine with piezo injectors in a common rail system constant, so that the function of the piezo injectors is maintained and pressure fluctuations are prevented at the injection nozzles. A common rail system refers to a diesel direct-injection internal combustion engine, in which all cylinders are located on a common distribution line for the fuel. In this distribution line, a permanently high pressure is generated, the fuel stored and distributed to the regulated injection nozzles. The advantages of the common rail system are better mixture formation in the cylinders, lower fuel consumption and lower emissions.

Die Druckhalteventilanordnung 100 umfasst eine Fluidhauptstrecke 103 durch die bei Überschreiten eines vorgegebenen Druckes der Kraftstoff in Pfeilrichtung fließt. Die Kraftstoffleitung ist mittels eines mit einer schraubenförmigen Druckfeder 115 belasteten Schließkörpers 105 zum Aufrechterhalten eines Kraftstoffdruckes schließbar. Überschreitet der Druck in der Kraftstoffleitung 101 einen Sollwert bewegt sich der Schließkörper 105 axial zur Seite und gibt den Weg für den in der Kraftstoffleitung 101 befindlichen Kraftstoff frei, so dass dieser aus der Kraftstoffleitung 101 strömen kann. Der Druck in der Kraftstoffleitung 101 wird solange vermindert, bis der Sollwert wieder erreicht ist. Der federbelastete Schließkörper 105 dient somit zum Aufrechterhalten und Stabilisieren des Druckes in der Kraftstoffleitung 101.The pressure holding valve arrangement 100 comprises a fluid main section 103 through which the fuel flows in the direction of the arrow when a predetermined pressure is exceeded. The fuel line can be closed by means of a closing member 105 loaded with a helical compression spring 115 to maintain a fuel pressure. If the pressure in the fuel line 101 exceeds a set value, the closing body 105 moves axially to the side and clears the path for the fuel located in the fuel line 101 so that it can flow out of the fuel line 101. The pressure in the fuel line 101 is reduced until the desired value is reached again. The spring-loaded closing body 105 thus serves to maintain and stabilize the pressure in the fuel line 101.

Der rotationssymmetrische Schließkörper 105 weist einen Schließkörperkopf 107 und einen zylindrischen Schaft 113 auf, an dem die Feder 115 anliegt. Die Feder 115 übt eine Kraft auf den Schließkörperkopf 107 aus, die diesen in den Dichtsitz 117 drückt. Der Schließköperkopf 107 des Schließkörpers 105 dient zum Verschließen der Fluidhauptstrecke 103. Der zum Öffnen der Fluidhauptstrecke 103 erforderliche Kraftstoffdruck wird durch die Federkonstante und die Vorspannung der Feder 115 bestimmt. Der Dichtsitz 117 weist eine becherförmige Aussparung auf, an deren Seitenwand der Schließkörperkopf 107 im geschlossenen Zustand anliegt.The rotationally symmetrical closing body 105 has a closing body head 107 and a cylindrical shaft 113 against which the spring 115 rests. The spring 115 exerts a force on the closing body head 107, which presses it into the sealing seat 117. The closing body head 107 of the closing body 105 serves to close the fluid main section 103. The fuel pressure required to open the fluid main section 103 is determined by the spring constant and the prestressing of the spring 115. The sealing seat 117 has a cup-shaped recess, on the side wall of the closing body head 107 rests in the closed state.

Daneben umfasst die Druckhalteventilanordnung 100 eine Fluidnebenstrecke 109, die zum Befüllen der Kraftstoffleitung 101 mit Kraftstoff in dem federbelasteten Schließkörper 105 gebildet ist. Zum Verschließen der Fluidnebenstrecke dient eine Kugel 111 als weiterer Schließkörper. Bei einer Bewegung des größeren Schließkörpers 105 aufgrund eines Überdruckes in der Kraftstoffleitung 101 wird die Kugel 111 sowohl durch den Druck des Kraftstoffes als auch durch eine Feder 119 in einer trichterförmigen Aussparung innerhalb des Schließkörpers 105 gehalten. Der Kraftstoff strömt in diesem Fall um den Schließkörper 105 herum.In addition, the pressure-retaining valve arrangement 100 comprises a fluid secondary section 109, which is formed to fill the fuel line 101 with fuel in the spring-loaded closing body 105. To close the fluid by-pass serves a ball 111 as a further closing body. In a movement of the larger closing body 105 due to an overpressure in the fuel line 101, the ball 111 is held both by the pressure of the fuel and by a spring 119 in a funnel-shaped recess within the closing body 105. The fuel flows around the closing body 105 in this case.

Bei der Herstellung des Fahrzeugs oder nach einer Wartung oder Reparatur ist es oftmals erforderlich, dass eine Erst- oder Wiederbefüllung der Kraftstoffleitung 101 mit Kraftstoff vorgenommen wird. Die Erst- oder Wiederbefüllung mit Kraftstoff erfolgt in einer Befüllrichtung, die entgegengesetzt zu der Pfeilrichtung ist, die die Hauptflussrichtung des Kraftstoffes beim Betrieb des Verbrennungsmotors angibt.In the manufacture of the vehicle or after a service or repair, it is often necessary to fuel or refill the fuel line 101 first. The first or refilling with fuel takes place in a filling direction, which is opposite to the arrow direction, which indicates the main flow direction of the fuel during operation of the internal combustion engine.

Bei der Befüllung der Kraftstoffleitung 101 wird der große Schließkörper 105 in den Dichtsitz 117 gedrückt, während die Kugel 111 die trichterförmige Aussparung im Schließkörperkopf 107 freigibt und der Kraftstoff zum Befüllen der Kraftstoffleitung durch die Fluidnebenstrecke 109 im Inneren des Schließkörpers 105 fließt.When filling the fuel line 101 of the large closing body 105 is pressed into the sealing seat 117, while the ball 111, the funnel-shaped recess in the Schließkörperkopf 107 releases and the fuel to fill the fuel line through the fluid secondary section 109 inside the closing body 105 flows.

In der Befüllungsrichtung wirkt der Kraftstoff als Fluid mit einem Druck auf den Schließkörper 105 in der Fluidhauptstrecke 103 und dichtet so den Durchlass ab. Gleichseitig wirkt der Kraftstoff mit demselben Druck auf die Kugel 111 und öffnet die Fluidnebenstrecke 109. Übersteigt der Druck einen vorbestimmen Druck, wie beispielsweise einen Öffnungsdruck von 0,6 bar, findet die Befüllung der Kraftstoffleitung 101 statt. Der Druck der zum Öffnen der Fluidnebenstrecke 109 erforderlich ist, wird durch die Feder 119 bestimmt.In the filling direction, the fuel acts as a fluid with a pressure on the closing body 105 in the fluid main section 103 and thus seals off the passage. At the same time, the fuel acts with the same pressure on the ball 111 and opens the fluid secondary section 109. If the pressure exceeds a predetermined pressure, such as an opening pressure of 0.6 bar, the filling of the fuel line 101 takes place. The pressure required to open the fluid by-pass 109 is determined by the spring 119.

Die Druckhalteventilanordnung 100 umfasst somit zwei fluidtechnisch gegeneinander angeordnete Ventile, von denen eines in Richtung der Kraftstoffleitung 101 öffnet und das andere in Richtung einer Vorlaufleitung öffnet, so dass zwei Durchflussrichtungen bei unterschiedlichen Drücken realisiert werden können.The pressure-retaining valve arrangement 100 thus comprises two fluidically arranged valves, one of which opens in the direction of the fuel line 101 and the other opens in the direction of a supply line, so that two directions of flow can be realized at different pressures.

Die Druckhalteventilanordnung 100 ist durch Aussparungen in den beiden Formteilen 121 und 123 gebildet. Die beiden Formteile 121 und 123 weisen beispielsweise eine zylindrische Form auf, in deren Mitte sich eine Aussparung zur Aufnahme der Federn 115 und 119 und der Schließkörper 105 und 111 befindet. Die Druckhalteventilanordnung 100 wird daher durch das Zusammenspiel der beiden Formteile 121 und 123 gebildet. Das Formteil 121 umfasst eine Aussparung für den Dichtsitz 117 des Schließkörpers 105. Das Formteil 123 umfasst eine zylinderförmige Aussparung für die Feder 115.The pressure holding valve assembly 100 is formed by recesses in the two mold parts 121 and 123. The two mold parts 121 and 123 have, for example, a cylindrical shape, in the middle of which there is a recess for receiving the springs 115 and 119 and the closing bodies 105 and 111. The pressure holding valve arrangement 100 is therefore formed by the interaction of the two mold parts 121 and 123. The molded part 121 comprises a recess for the sealing seat 117 of the closing body 105. The molded part 123 comprises a cylindrical recess for the spring 115.

Als Federn 115 und 119 können Schraubenfedern verwendet werden, die aus Federdraht zylinder-, kegel- oder tonnenförmig gewickelt sind. Der Drahtquerschnitt der Federn wird bei Belastung auf Torsion beansprucht. Die Federkonstante wird durch die Eigenschaften des verwendeten Federdrahts festgelegt. Die Federcharakteristik und die Federkonstante kann durch Bereiche mit veränderlichem Drahtdurchmesser, variabler Steigung oder sich veränderndem Federdurchmesser angepasst werden, wie beispielsweise bei einer kegelstumpfförmigen Schraubenfeder.As springs 115 and 119 coil springs can be used, which are wound from spring wire cylindrical, conical or barrel-shaped. The wire cross-section of the springs is subjected to torsion under load. The spring constant is determined by the properties of the spring wire used. The spring characteristic and the spring constant can be adapted by ranges of variable wire diameter, variable pitch or varying spring diameter, such as in a frusto-conical coil spring.

Im Allgemeinen können die beiden Formteile 121 und 123 statt einer zylindrischen Form jede andere Form aufweisen und in einer beliebigen Weise miteinander verbunden sein, wie beispielsweise miteinander verschweißt sein. In einer anderen Ausführungsform kann auch ein einteiliges Formteil verwendet werden.In general, instead of a cylindrical shape, the two mold parts 121 and 123 may have any other shape and be interconnected in any manner, such as being welded together. In another embodiment, a one-piece molding can also be used.

Die beiden Formteile 121 und 123 sind in zwei Gehäuseteilen 125 und 127 angeordnet, die diese vollständig umschließen und Anschlüsse für die Kraftstoffleitung 101 und den Vorlauf aufweisen. Die beiden Gehäuseteile 125 und 127 können miteinander verschraubt sein. Dazu kann eines der Gehäuseteile 125 ein nicht gezeigtes Außengewinde und das andere der Gehäuseteile 127 ein Innengewinde umfassen, die ineinander gedreht werden können.The two mold parts 121 and 123 are arranged in two housing parts 125 and 127 which completely surround them and have connections for the fuel line 101 and the supply line. The two housing parts 125 and 127 may be screwed together. For this purpose, one of the housing parts 125 comprise a male thread, not shown, and the other of the housing parts 127 comprise an internal thread, which can be rotated into one another.

Zwischen den beiden Gehäuseteilen 125 und 127 ist eine umlaufende Dichtung 129 angeordnet, die verhindert, dass Kraftstoff aus dem Inneren der Druckhalteventilanordnung 100 nach außen dringt. Daneben sind jeweils zwischen dem Formteil 121 und dem Gehäuseteil 127 und zwischen dem Formteil 123 und dem Gehäuseteil 125 weitere Dichtungen 131 und 133, wie beispielsweise Dichtringe, angeordnet, die ebenfalls das Ausdringen von Kraftstoff verhindern.Between the two housing parts 125 and 127, a circumferential seal 129 is arranged, which prevents fuel from the interior of the pressure retaining valve assembly 100 passes to the outside. In addition, between each of the molded part 121 and the housing part 127 and between the molded part 123 and the housing part 125 further seals 131 and 133, such as sealing rings, arranged, which also prevent the escape of fuel.

Im Allgemeinen können die beiden Gehäuseteile 125 und 127 jede andere geeignete Form aufweisen und in einer beliebigen Weise miteinander verbunden sein, wie beispielsweise miteinander verschweißt sein.In general, the two housing parts 125 and 127 may have any other suitable shape and be interconnected in any manner, such as being welded together.

Das Gehäuse der Druckhalteventilanordnung 100 weist zwei Anschlüsse auf, die dazu dienen die Druckhalteventilanordnung 100 mit der Kraftstoffleitung 101 zu verbinden, so dass der Kraftstoff bei Vorliegen eines Überdruckes durch die Druckhalteventilanordnung 100 strömen kann.The housing of the pressure-holding valve arrangement 100 has two connections which serve to connect the pressure-holding valve arrangement 100 to the fuel line 101, so that the fuel can flow through the pressure-retaining valve arrangement 100 in the presence of an overpressure.

In anderen Ausführungsformen können die Formteile 121 und 123 und die Gehäuseteile 125 und 127 jedoch in anderer Weise ausgebildet sein. Insbesondere können die Formteile 121 und 123 mit den Gehäuseteilen 125 und 127 verschmolzen sein, so dass diese ein einziges zusammenhängendes Bauteil bilden. Die Formteile 121 und 123 sowie die Gehäuseteile 125 und 127 können aus geeigneten thermoplastischen Kunststoffen im Spritzgussverfahren hergestellt sein. Besonders vorteilhaft ist die Verwendung von faserverstärkten Kunststoffen, da diese eine besonders hohe Festigkeit und Druckbeständigkeit aufweisen.However, in other embodiments, the mold members 121 and 123 and the housing members 125 and 127 may be formed in other ways. In particular, the mold parts 121 and 123 may be fused to the housing parts 125 and 127 so that they form a single coherent component. The mold parts 121 and 123 and the housing parts 125th and 127 may be injection molded from suitable thermoplastics. Particularly advantageous is the use of fiber-reinforced plastics, since they have a particularly high strength and pressure resistance.

Fig. 2 zeigt eine seitliche Ansicht auf den Schließkörper 105. Der Schließkörper 105 weist einen zylindrischen Schaft 113 auf, an dessen Ende der Schließkörperkopf 107 gebildet ist. Auf dem Schließkörperkopf 107 ist eine Dichtfläche 203 gebildet, die im geschlossenen Zustand der Fluidhauptstrecke 103 an einer Wandung anliegt und so die Fluidhauptstrecke 103 sperrt. Zur Verbesserung der Dichteigenschaften kann die Dichtfläche 203 mit einem Dichtmaterial versehen werden. Fig. 2 shows a side view of the closing body 105. The closing body 105 has a cylindrical shaft 113, at the end of the closing body head 107 is formed. On the closing body head 107, a sealing surface 203 is formed, which rests against a wall in the closed state of the fluid main section 103 and thus blocks the fluid main section 103. To improve the sealing properties, the sealing surface 203 may be provided with a sealing material.

Daneben umfasst der Schließkörper 105 entlang seiner Oberfläche acht Führungslamellen 201 und 207, die den Kraftstoff beim Vorbeiströmen kanalisieren. Zu diesem Zweck sind zwischen den Führungslamellen 201 und 207 segmentförmige Aussparungen 209 gebildet. Im Allgemeinen kann der Schließkörper 105 jedoch auch eine andere Zahl an Führungslamellen 201 und 207 aufweisen.In addition, the closing body 105 comprises along its surface eight guide blades 201 and 207, which channel the fuel when flowing past. For this purpose, segment-shaped recesses 209 are formed between the guide plates 201 and 207. In general, however, the closing body 105 may also have a different number of guide blades 201 and 207.

Fig. 3 zeigt eine Querschnittsansicht des Schließkörpers 105. Die Querschnittsansicht verläuft durch zwei der Führungslamellen 201 und 207. Im Zentrum des Schließkörpers 105 befindet sich ein zylindrischer Kanal, der die Fluidnebenstrecke 109 bildet. Im Schließkörperkopf 107 befindet sich eine trichterförmige Aussparung 205, die mit dem zylindrischen Kanal verbunden ist und zur Aufnahme der Kugel 111 dient. Zur Verbesserung der Dichteigenschaften kann die Aussparung 205 mit einem Dichtmaterial ausgekleidet sein. Die trichterförmige Aussparung 205 weist den Vorteil auf, dass sich die Kugel 111 in dieser selbstständig zentriert und so eine gute Abdichtung der Fluidnebenstrecke 109 erreicht wird. Im Allgemeinen kann jedoch die Aussparung 205 eine andere Form aufweisen, wie beispielsweise becherförmig. Fig. 3 shows a cross-sectional view of the closing body 105. The cross-sectional view extends through two of the guide plates 201 and 207. In the center of the closing body 105 is a cylindrical channel which forms the fluid secondary section 109. In the closing body head 107 is a funnel-shaped recess 205 which is connected to the cylindrical channel and serves to receive the ball 111. To improve the sealing properties, the recess 205 may be lined with a sealing material. The funnel-shaped recess 205 has the advantage that the ball 111 is self-centered in this and so a good seal of the fluid secondary section 109 is achieved. In general, however, the recess 205 may have a different shape, such as cup-shaped.

Die Dichtfläche 203 ist an dem übrigen Schließkörperkopf 107 hervorgewölbt, so dass diese die Fluidhauptstrecke 103 wirksam verschließen kann. Im Kanal der Fluidnebenstrecke 109 kann zusätzlich ein nicht gezeigtes Filterelement oder ein Sieb angeordnet sein, das beim Befüllen der Kraftstoffleitung 101 dazu dient, den Kraftstoff zu reinigen.The sealing surface 203 is bulged on the rest of the closing body head 107, so that they can effectively close the fluid main section 103. In addition, a not-shown filter element or a sieve may be arranged in the channel of the fluid sub-section 109, which serves to clean the fuel when filling the fuel line 101.

Fig. 4 zeigt eine perspektivische Ansicht des Schließkörpers 105 mit den Führungslamellen 201 und 207 und der trichterförmigen Aussparung 205. Der Schließkörper 105 kann beispielsweise aus thermoplastischem Kunststoff im Spritzgussverfahren hergestellt werden. Im Allgemeinen können jedoch auch alle anderen Materialien verwendet werden, die zur Herstellung des Schließkörpers geeignet sind. Fig. 4 shows a perspective view of the closing body 105 with the guide blades 201 and 207 and the funnel-shaped recess 205. The closing body 105 may for example, be made of thermoplastic material by injection molding. In general, however, all other materials that are suitable for the production of the closing body can also be used.

Im Allgemeinen kann die Form des verwendeten Schließkörpers 105 von der in den Figuren gezeigten abweichen.In general, the shape of the closing body 105 used may differ from that shown in the figures.

Alle in der Beschreibung erläuterten und den Figuren gezeigten Einzelmerkmale, können in beliebiger sinnvoller Art und Weise miteinander kombiniert werden, um gleichzeitig deren vorteilhafte Wirkungen zu realisieren. Die beschrieben und gezeigten Druckhalteventilanordnungen sind im Allgemeinen in einer Kraftstoffeinspritzvorrichtung einer Brennkraftmaschine oder zum Steuern der Strömung von anderen Flüssigkeiten einsetzbar.All of the individual features explained in the description and shown in the figures can be combined with one another in any meaningful manner in order to simultaneously realize their advantageous effects. The pressure holding valve assemblies described and illustrated are generally applicable to a fuel injector of an internal combustion engine or to control the flow of other fluids.

BEZUGSZEICHENLISTELIST OF REFERENCE NUMBERS

100100 DruckhalteventilanordnungPressure holding valve arrangement 101101 KraftstoffleitungFuel line 103103 FluidhauptstreckeFluid mainline 105105 Schließkörperclosing body 107107 SchließkörperkopfClosing body head 109109 FluidnebenstreckeFluid branch line 111111 Schließkörperclosing body 113113 Schaftshaft 115115 Federfeather 117117 Dichtsitzsealing seat 119119 Federfeather 121121 Formteilmolding 123123 Formteilmolding 125125 Gehäuseteilhousing part 127127 Gehäuseteilhousing part 129129 Dichtungpoetry 131131 Dichtungpoetry 133133 Dichtungpoetry 201201 Führungguide 203203 Dichtflächesealing surface 205205 Aussparungrecess 207207 Führungguide 209209 Aussparungrecess

Claims (10)

Druckhalteventilanordnung (100) für eine Kraftstoffleitung (101), mit: einer Fluidhauptstrecke (103), die mittels eines ersten federbelasteten Schließkörpers (105) zum Aufrechterhalten eines Kraftstoffdruckes in der Kraftstoffleitung (101) schließbar ist; wobei der erste Schließkörper (105) einen Schließkörperkopf (107) zum Abdichten der Fluidhauptstrecke (103) umfasst, der mittels einer Federkraft gegen einen Dichtsitz anpressbar ist; einer Fluidnebenstrecke (109), die zum Befüllen der Kraftstoffleitung (101) mit Kraftstoff in dem ersten federbelasteten Schließkörper (105) gebildet ist; und einem zweiten federbelasteten Schließkörper (111), der zum Schließen der Fluidnebenstrecke (109) vorgesehen ist. Pressure maintenance valve arrangement (100) for a fuel line (101), comprising: a fluid main section (103) closable by means of a first spring-loaded closing body (105) for maintaining a fuel pressure in the fuel line (101); wherein the first closing body (105) comprises a closing body head (107) for sealing the main fluid path (103) which can be pressed against a sealing seat by means of a spring force; a fluid by-pass (109) formed to fill the fuel line (101) with fuel in the first spring-loaded closing body (105); and a second spring-loaded closing body (111), which is provided for closing the fluid by-pass (109). Druckhalteventilanordnung (100) nach Anspruch 1, wobei die Fluidnebenstrecke (109) als eine axiale Bohrung durch den ersten federbelasteten Schließkörper (105) gebildet ist.The pressure holding valve assembly (100) of claim 1, wherein the fluid sub-branch (109) is formed as an axial bore through the first spring-loaded closing body (105). Druckhalteventilanordnung (100) nach einem der vorstehenden Ansprüche, wobei der erste federbelastete Schließkörper (105) einen zylindrischen Schaft (113), der in den Schließkörperkopf (107) übergeht, und eine Feder (115) umfasst, die den zylindrischen Schaft (113) umgibt und auf den Schließkörperkopf (107) einwirkt.A pressure holding valve assembly (100) according to any one of the preceding claims, wherein the first spring-loaded closing body (105) comprises a cylindrical stem (113) which merges into the closing body head (107) and a spring (115) surrounding the cylindrical stem (113) and acting on the closing body head (107). Druckhalteventilanordnung (100) nach einen der vorstehenden Ansprüche, wobei der Schließkörperkopf (107) eine rotationsymmetrische Pilzform aufweist.Pressure-holding valve arrangement (100) according to one of the preceding claims, wherein the closing body head (107) has a rotationally symmetrical mushroom shape. Druckhalteventilanordnung (100) nach einem der vorstehenden Ansprüche, wobei die Fluidnebenstrecke (109) einen Dichtsitz (117) für die Aufnahme des zweiten federbelasteten Schließkörpers (111) umfasst.Pressure-holding valve arrangement (100) according to one of the preceding claims, wherein the fluid secondary section (109) comprises a sealing seat (117) for receiving the second spring-loaded closing body (111). Druckhalteventilanordnung (100) nach einem der vorangehenden Ansprüche, wobei eine Außenwandung des ersten federbelasteten Schließkörpers (105) zumindest eine axiale Führung (201) zum Führen von Kraftstoff umfasst.Pressure-holding valve assembly (100) according to one of the preceding claims, wherein an outer wall of the first spring-loaded closing body (105) comprises at least one axial guide (201) for guiding fuel. Druckhalteventilanordnung (100) nach einem der vorstehenden Ansprüche, wobei der zweite federbelastete Schließkörper (111) durch eine Dichtkugel gebildet ist.Pressure-holding valve arrangement (100) according to one of the preceding claims, wherein the second spring-loaded closing body (111) is formed by a sealing ball. Druckhalteventilanordnung (100) nach einem der vorstehenden Ansprüche, wobei eine Feder (119) vorgesehen ist, um auf den zweiten federbelasteten Schließkörper (111) zum Schließen der Fluidnebenstrecke (109) einzuwirken.A pressure holding valve assembly (100) according to any one of the preceding claims, wherein a spring (119) is provided to act on the second spring-loaded closing body (111) to close the secondary fluid path (109). Druckhalteventilanordnung (100) nach einem der vorstehenden Ansprüche, wobei die Fluidhauptstrecke (103) sowie die Fluidnebenstrecke (109) in einem Formkörper (121, 123) gebildet sind, und wobei der erste federbelastete Schließkörper (105) und der zweite federbelastete Schließkörper (111) axial verschiebbar in dem Formkörper (121, 123) angeordnet sind.Pressure-holding valve arrangement (100) according to one of the preceding claims, wherein the fluid main section (103) and the fluid secondary section (109) are formed in a shaped body (121, 123), and wherein the first spring-loaded closing body (105) and the second spring-loaded closing body (111) axially displaceable in the shaped body (121, 123) are arranged. Druckhalteventilanordnung (100) nach einem der vorstehenden Ansprüche, wobei eine auf den ersten Schließkörper (105) einwirkende Federkraft geringer als eine auf den zweiten Schließkörper (111) einwirkende Federkraft ist.Pressure-holding valve arrangement (100) according to one of the preceding claims, wherein a spring force acting on the first closing body (105) is less than a spring force acting on the second closing body (111).
EP13156745.5A 2012-05-15 2013-02-26 Pressure maintenance valve for a fuel line Revoked EP2664783B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201210208110 DE102012208110A1 (en) 2012-05-15 2012-05-15 Pressure holding valve arrangement for a fuel line

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EP2664783A1 true EP2664783A1 (en) 2013-11-20
EP2664783B1 EP2664783B1 (en) 2015-06-03

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US (1) US20130306178A1 (en)
EP (1) EP2664783B1 (en)
DE (1) DE102012208110A1 (en)
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US20130306178A1 (en) 2013-11-21
ES2545056T3 (en) 2015-09-08
EP2664783B1 (en) 2015-06-03
DE102012208110A1 (en) 2013-11-21

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