WO2008125540A1 - Valve and pump having such a valve - Google Patents
Valve and pump having such a valve Download PDFInfo
- Publication number
- WO2008125540A1 WO2008125540A1 PCT/EP2008/054192 EP2008054192W WO2008125540A1 WO 2008125540 A1 WO2008125540 A1 WO 2008125540A1 EP 2008054192 W EP2008054192 W EP 2008054192W WO 2008125540 A1 WO2008125540 A1 WO 2008125540A1
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- WO
- WIPO (PCT)
- Prior art keywords
- valve
- valve body
- guide
- axial
- pump
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
- F04B1/0404—Details or component parts
- F04B1/0452—Distribution members, e.g. 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
- F04B1/0404—Details or component parts
- F04B1/0452—Distribution members, e.g. valves
- F04B1/0456—Cylindrical
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
- F04B1/0404—Details or component parts
- F04B1/0452—Distribution members, e.g. valves
- F04B1/0461—Conical
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/10—Valves; Arrangement of valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/10—Valves; Arrangement of valves
- F04B53/102—Disc valves
- F04B53/1022—Disc valves having means for guiding the closure member axially
- F04B53/1025—Disc valves having means for guiding the closure member axially the guiding means being provided within the valve opening
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K15/00—Check valves
- F16K15/02—Check valves with guided rigid valve members
- F16K15/06—Check valves with guided rigid valve members with guided stems
- F16K15/063—Check valves with guided rigid valve members with guided stems the valve being loaded by a spring
Definitions
- the present invention relates to a valve, in particular a suction valve of a positive displacement pump.
- the invention further relates to a pump, in particular a positive displacement pump for use in a fuel supply system of a motor vehicle.
- valves are used in many places, for example. In the form of check valves.
- suction valves and / or high-pressure valves are used.
- Such a valve is usually arranged at a suitable location in the pump housing, so that the pulsating suction pressure generated by a positive displacement or radial piston pump is permanently maintained.
- the valve has a
- Sealing seat on which a biased by a spring valve body is seated and thereby closes the valve.
- the fluid or fuel flowing through the valve is thus prevented from flowing. Only when the pressure on the sealing seat exceeds the force exerted by the spring, the valve body is lifted from the sealing seat and moved away from it, whereby the valve is opened.
- valve body partially disc-shaped components are used.
- hemispherical or conical components can be used as a valve body.
- the environment and spatial arrangement of the suction valve is usually designed such that for the
- Suction valve seat and the axial bias of the suction valve seat separate components are used.
- the bias of the Suction valve seat is often done by means of a threaded pin.
- the invention is based on the object to provide a valve for a pump with a sealing seat and with a biased against valve body available, which is constructed as compact as possible, and in which the valve body is exactly guided and defined biased. It should also be created a pump with such a valve.
- an axial guide for a valve body which has at least one closable by the valve body axial passage.
- the valve has a sealing seat, a valve body closing the sealing seat, an axial guide for the valve body and a spring device which biases the valve body against the sealing seat.
- a valve may be a suction valve of the displacement or suction pump, which is part of a fuel supply system of a motor vehicle.
- the axial passage in the region of the axial guidance of the valve body saves the arrangement of an additional closable inlet opening next to and / or separately from the valve seat, which establishes a connection between the suction side of the valve and its high-pressure side.
- the axial guide serves to largely play-free guidance of a shaft portion of the valve body, so that the valve body is axially displaceable between two end stops, which characterize an open and a closed position of the valve.
- the axial guide may in particular be formed by a guide bush which is arranged in a housing seat is.
- the guide bush at the same time has an axial travel limitation for the valve body or forms such an axial path limitation.
- the guide bushing may have a guide seat for the spring device, which biases the valve body against the sealing seat.
- the axial guide or the guide bush can optionally have a single inlet window for pressurized fluid.
- two, three or more inlet windows may be provided, which are arranged on the outer circumference of the guide bush. These inlet windows expediently extend in the axial direction, i. parallel to the stroke direction of the valve body whose valve stem is guided axially displaceably in the guide bushing with the inlet openings or inlet windows arranged on the outside.
- the valve according to the invention is in particular a suction valve of a positive displacement pump.
- This suction valve is particularly suitable for placement or arrangement in the displacement of the pump, as it is ideally coaxial with the displacer of
- the valve has very few components.
- the arrangement of the suction valve directly in the piston axis a very small dead volume is formed and also achieved a very high volumetric efficiency.
- the guide bushing can ne junk serve as a guide element for the Saugschongharmonic, as a support element for the inlet window, as a stroke limiter for the valve body and / or as a spring receptacle for the valve spring.
- FIG. 1 shows a longitudinal section of an embodiment of a valve according to the invention in the installed position
- FIG. 2 shows in a further longitudinal section a detail view of the valve according to FIG. 1, and
- FIG. 3 shows a perspective view of a guide bush, which is part of the valve according to FIG.
- FIG 1 shows a longitudinal sectional view of a variant of a valve 10 in the installed position.
- a suction valve 12 as is typically used in a high-pressure pump of a fuel supply system of an internal combustion engine (not shown).
- the valve 10 is arranged in a cylinder housing 14 of the high-pressure pump.
- this high-pressure pump is a suction pump 16, which has a cylindrical displacer unit 18, to which the valve 10 or suction valve 12 is arranged in a coaxial installation position.
- a conical valve or sealing seat 20 and a sealing seat 20 occlusive valve body 22 are arranged with a conical sealing surface in the cylinder housing 14 of the suction valve 12.
- the conical sealing surface of the valve body 22 abuts flat against the hollow cone-shaped sealing seat 20.
- the valve body 22 is pressed against the sealing seat 20 of the cylinder housing 14 with a spring device 24.
- This spring device 24 is formed in the illustrated embodiment by a coil spring 25.
- a valve stem 26 of the valve body 22 is held in an axial guide 28 which is formed by a guide bush 30.
- a cylindrical portion 32 (FIG 3) of the guide bush 30 is firmly seated in a corresponding hollow cylindrical bore of the cylinder housing 14.
- a shoulder 34 of the guide bush 30 with a larger diameter forms an axial stop, up to which the guide bush 30 into the bore of the cylinder housing 14 can be pushed.
- a centering collar 36 is arranged, which provides an end of the coil spring 25 has a bearing surface and at the same time ensures their centering.
- FIG. 3 shows a possible embodiment of the guide bush 30, in whose outer circumferential surface of its cylindrical section 32 a plurality of notch-like, in plan view, semicircular recesses are arranged, which together form an axial passage 38.
- This axial passage 38 in the form of four symmetrically arranged inlet windows 40, with the suction valve 12 open, establishes a connection between the high-pressure chamber 42 and a low-pressure chamber 50 of the suction pump 16, as illustrated by FIGS. 1 and 2.
- the hollow cylindrical guide diameter 44 of the guide bush 30 corresponds to the outer diameter of the valve stem 26. As a result, it can slide in the axial direction largely free of play, but with as little friction as possible, so that the valve 10 opens and closes in the desired manner.
- Guide bush 30 serves to limit the axial stroke of the valve body 22 and forms for this purpose a stop for a guide sleeve 48.
- the coil spring 25 is at ih- rer the guide bushing 30 opposite side held by the guide sleeve 48 which is fixed to the upper end of the valve stem 26. If the guide bush 30 facing side of the guide sleeve 48 on the end face 46, so the maximum opening stroke of the suction valve 12 is reached.
- the low-pressure chamber 50 above the valve 10 is closed to the outside by a cap 52.
- a fuel inlet 54 opens into the low pressure chamber 50.
- guide bush 30 is used in the embodiment shown as a guide element for the Saugventilschongeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckeckol, as a stroke limiter for the maximum opening stroke of the valve body 22 and as a spring receptacle for supporting the coil spring 25 serving as closing spring means 24.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Details Of Reciprocating Pumps (AREA)
Abstract
Description
Beschreibungdescription
Ventil und Pumpe mit einem solchen VentilValve and pump with such a valve
Die vorliegende Erfindung betrifft ein Ventil, insbesondere ein Saugventil einer Verdrängerpumpe. Die Erfindung betrifft weiterhin eine Pumpe, insbesondere eine Verdrängerpumpe für den Einsatz in einem Kraftstoffversorgungssystem eines Kraftfahrzeugs .The present invention relates to a valve, in particular a suction valve of a positive displacement pump. The invention further relates to a pump, in particular a positive displacement pump for use in a fuel supply system of a motor vehicle.
Für den Einsatz in kraftstoffführenden Leitungen und Pumpen in Kraftfahrzeugen werden an vielen Stellen Ventile eingesetzt, bspw. in Form von Rückschlagventilen. Bei Kraftstoffhochdruckpumpen kommen so genannte Saugventile und/oder Hoch- druckventile zum Einsatz.For use in fuel-carrying lines and pumps in motor vehicles valves are used in many places, for example. In the form of check valves. For high-pressure fuel pumps, so-called suction valves and / or high-pressure valves are used.
Ein derartige Ventil ist üblicherweise an geeigneter Stelle im Pumpengehäuse angeordnet, so dass der von einer Verdränger- oder Radialkolbenpumpe erzeugte pulsierende Saugdruck permanent aufrecht erhalten wird. Das Ventil weist einenSuch a valve is usually arranged at a suitable location in the pump housing, so that the pulsating suction pressure generated by a positive displacement or radial piston pump is permanently maintained. The valve has a
Dichtsitz auf, auf dem ein von einer Feder vorgespannter Ventilkörper aufsitzt und das Ventil dadurch verschließt. Das durch das Ventil strömende Fluid oder der Kraftstoff wird somit am Durchfluss gehindert. Erst wenn der Druck am Dichtsitz die von der Feder ausgeübte Kraft übersteigt, wird der Ventilkörper vom Dichtsitz abgehoben und von diesem weg bewegt, wodurch das Ventil geöffnet wird.Sealing seat on which a biased by a spring valve body is seated and thereby closes the valve. The fluid or fuel flowing through the valve is thus prevented from flowing. Only when the pressure on the sealing seat exceeds the force exerted by the spring, the valve body is lifted from the sealing seat and moved away from it, whereby the valve is opened.
Als Ventilkörper werden teilweise scheibenförmige Bauteile verwendet. Zur Verbesserung der Umströmung des Ventilkörpers können Kugeln, halbkugelförmige oder kegelförmige Bauteile als Ventilkörper verwendet werden.As a valve body partially disc-shaped components are used. To improve the flow around the valve body balls, hemispherical or conical components can be used as a valve body.
Bei einer Pumpe ist die Umgebung und räumliche Anordnung des Saugventils üblicherweise derart gestaltet, dass für denIn a pump, the environment and spatial arrangement of the suction valve is usually designed such that for the
Saugventilsitz und die axiale Vorspannung des Saugventilsitzes separate Bauteile eingesetzt werden. Die Vorspannung des Saugventilsitzes erfolgt dabei oftmals mittels eines Gewindestiftes .Suction valve seat and the axial bias of the suction valve seat separate components are used. The bias of the Suction valve seat is often done by means of a threaded pin.
Der Erfindung liegt die Aufgabe zu Grunde, ein Ventil für eine Pumpe mit einem Dichtsitz und mit einem dagegen vorgespannten Ventilkörper zur Verfügung zu stellen, das möglichst kompakt aufgebaut ist, und bei dem der Ventilkörper exakt geführt sowie definiert vorgespannt ist. Es soll zudem eine Pumpe mit einem derartigen Ventil geschaffen werden.The invention is based on the object to provide a valve for a pump with a sealing seat and with a biased against valve body available, which is constructed as compact as possible, and in which the valve body is exactly guided and defined biased. It should also be created a pump with such a valve.
Die erstgenannte Aufgabe wird erfindungsgemäß gelöst durch die Merkmale des Anspruchs 1. Vorteilhafter Weiterbildungen und Varianten sind Gegenstand der abhängigen Ansprüche.The first object is achieved by the features of claim 1. Advantageous developments and variants are the subject of the dependent claims.
Bei dem erfindungsgemäßen Ventil ist eine axiale Führung für einen Ventilkörper vorgesehen, die mindestens einen vom Ventilkörper verschließbaren axialen Durchlass aufweist. Das Ventil weist einen Dichtsitz, einen den Dichtsitz verschließenden Ventilkörper, eine axiale Führung für den Ventilkörper und eine Federeinrichtung auf, welche den Ventilkörper gegen den Dichtsitz vorspannt. Ein solches Ventil kann ein Saugventil der Verdränger- oder Saugpumpe sein, die Bestandteil eines Kraftstoffversorgungssystems eines Kraftfahrzeugs ist .In the valve according to the invention an axial guide for a valve body is provided which has at least one closable by the valve body axial passage. The valve has a sealing seat, a valve body closing the sealing seat, an axial guide for the valve body and a spring device which biases the valve body against the sealing seat. Such a valve may be a suction valve of the displacement or suction pump, which is part of a fuel supply system of a motor vehicle.
Der axiale Durchlass im Bereich der axialen Führung des Ventilkörpers erspart die Anordnung einer zusätzlichen verschließbaren ZulaufÖffnung neben dem und/oder separat vom Ventilsitz, die eine Verbindung zwischen der Ansaugseite des Ventils und dessen Hochdruckseite herstellt. Die axiale Führung dient zur weitgehend spielfreien Führung eines Schaftabschnittes des Ventilkörpers, so dass der Ventilkörper axial zwischen zwei Endanschlägen verschiebbar ist, die eine geöffnete und eine geschlossene Stellung des Ventils charak- terisieren.The axial passage in the region of the axial guidance of the valve body saves the arrangement of an additional closable inlet opening next to and / or separately from the valve seat, which establishes a connection between the suction side of the valve and its high-pressure side. The axial guide serves to largely play-free guidance of a shaft portion of the valve body, so that the valve body is axially displaceable between two end stops, which characterize an open and a closed position of the valve.
Die axiale Führung kann insbesondere durch eine Führungsbuchse gebildet sein, die in einem Gehäusesitz angeordnet ist. Gemäß einer bevorzugten Ausführungsvariante weist die Führungsbuchse gleichzeitig eine axiale Wegbegrenzung für den Ventilkörper auf oder bildet eine solche axiale Wegebegrenzung. Zudem kann die Führungsbuchse einen Führungssitz für die Federeinrichtung aufweisen, die den Ventilkörper gegen den Dichtsitz vorspannt.The axial guide may in particular be formed by a guide bush which is arranged in a housing seat is. According to a preferred embodiment, the guide bush at the same time has an axial travel limitation for the valve body or forms such an axial path limitation. In addition, the guide bushing may have a guide seat for the spring device, which biases the valve body against the sealing seat.
Alle diese einzelnen Merkmale tragen jeweils zur Bildung eines kompakten und leistungsfähigen Ventils bei. In ihrer Ge- samtheit liefern sie ein Ventil mit sehr wenigen Bauteilen, das zur Sicherstellung seiner Funktion nur einen kleinen Einbauraum aufweist und keine zusätzlichen ZulaufÖffnungen oder Zulaufleitungen benötigt, die beispielsweise im Ventilgehäuse oder im Pumpengehäuse vorzusehen wären.All of these individual features each contribute to the formation of a compact and efficient valve. In their entirety, they provide a valve with very few components, which has only a small installation space to ensure its function and requires no additional inlet openings or supply lines, which would be provided, for example, in the valve housing or in the pump housing.
Die axiale Führung bzw. die Führungsbuchse kann wahlweise ein einziges Zulauffenster für Druckfluid aufweisen. Alternativ können zwei, drei oder mehr Zulauffenster vorgesehen sein, die am äußeren Umfang der Führungsbuchse angeordnet sind. Diese Zulauffenster verlaufen zweckmäßigerweise in axialer Richtung, d.h. parallel zur Hubrichtung des Ventilkörpers, dessen Ventilschaft in der Führungsbuchse mit den außen angeordneten ZulaufÖffnungen bzw. Zulauffenstern axial verschiebbar geführt ist.The axial guide or the guide bush can optionally have a single inlet window for pressurized fluid. Alternatively, two, three or more inlet windows may be provided, which are arranged on the outer circumference of the guide bush. These inlet windows expediently extend in the axial direction, i. parallel to the stroke direction of the valve body whose valve stem is guided axially displaceably in the guide bushing with the inlet openings or inlet windows arranged on the outside.
Das erfindungsgemäße Ventil gemäß einer der zuvor beschriebenen Ausführungsvarianten ist insbesondere ein Saugventil einer Verdrängerpumpe. Dieses Saugventil eignet sich besonders für eine Platzierung oder Anordnung im Verdrängerraum der Pumpe, da es in idealer Weise koaxial zum Verdränger derThe valve according to the invention according to one of the previously described embodiments is in particular a suction valve of a positive displacement pump. This suction valve is particularly suitable for placement or arrangement in the displacement of the pump, as it is ideally coaxial with the displacer of
Pumpe angeordnet sein kann. Hierdurch wird eine Anordnung des Ventilsitzes im Zylinder der Pumpe ermöglicht, wodurch eine Hochdruckschnittstelle eingespart werden kann.Pump can be arranged. As a result, an arrangement of the valve seat in the cylinder of the pump is possible, whereby a high pressure interface can be saved.
Das Ventil weist sehr wenig Bauteile auf. Durch die Anordnung des Saugventils direkt in der Kolbenachse wird ein sehr geringes Totvolumen gebildet und zudem ein sehr hoher volu- metrischer Wirkungsgrad erreicht. Die Führungsbuchse kann ei- nerseits als Führungselement für den Saugschließkörper, als Trägerelement für die Zulauffenster, als Hubbegrenzer für den Ventilkörper und/oder als Federaufnahme für die Ventilfeder dienen .The valve has very few components. The arrangement of the suction valve directly in the piston axis a very small dead volume is formed and also achieved a very high volumetric efficiency. The guide bushing can nerseits serve as a guide element for the Saugschließkörper, as a support element for the inlet window, as a stroke limiter for the valve body and / or as a spring receptacle for the valve spring.
Nachfolgend werden Ausführungsbeispiele der Erfindung anhand einer Zeichnung näher erläutert. Darin zeigen:Embodiments of the invention will be explained in more detail with reference to a drawing. Show:
FIG 1 im Längsschnitt ein Ausführungsbeispiel eines er- findungsgemäßen Ventils in Einbaulage,1 shows a longitudinal section of an embodiment of a valve according to the invention in the installed position,
FIG 2 in einem weiteren Längsschnittes eine Detailansicht des Ventils gemäß FIG 1, und2 shows in a further longitudinal section a detail view of the valve according to FIG. 1, and
FIG 3 eine perspektivische Darstellung einer Führungsbuchse, die Teil des Ventils gemäß FIG 1 ist.3 shows a perspective view of a guide bush, which is part of the valve according to FIG.
Einander entsprechende Teile sind in allen Figuren mit den gleichen Bezugszeichen versehen.Corresponding parts are provided in all figures with the same reference numerals.
Die schematische Darstellung der FIG 1 zeigt anhand einer Längsschnittdarstellung eine Variante eines Ventils 10 in Einbaulage. Dargestellt ist ein Saugventil 12, wie es typischerweise in einer Hochdruckpumpe eines Kraftstoffversor- gungssystems einer Verbrennungskraftmaschine (nicht dargestellt) zum Einsatz kommt. Das Ventil 10 ist in einem Zylindergehäuse 14 der Hochdruckpumpe angeordnet. Diese Hochdruckpumpe ist im gezeigten Ausführungsbeispiel eine Saugpumpe 16, die eine zylindrische Verdrängereinheit 18 aufweist, zu der das Ventil 10 bzw. Saugventil 12 in koaxialer Einbaulage angeordnet ist.The schematic representation of FIG 1 shows a longitudinal sectional view of a variant of a valve 10 in the installed position. Shown is a suction valve 12, as is typically used in a high-pressure pump of a fuel supply system of an internal combustion engine (not shown). The valve 10 is arranged in a cylinder housing 14 of the high-pressure pump. In the exemplary embodiment shown, this high-pressure pump is a suction pump 16, which has a cylindrical displacer unit 18, to which the valve 10 or suction valve 12 is arranged in a coaxial installation position.
Gemäß FIG 2 sind im Zylindergehäuse 14 des Saugventils 12 ein kegeliger Ventil- oder Dichtsitz 20 sowie ein den Dichtsitz 20 verschließender Ventilkörper 22 mit kegelförmiger Dichtfläche angeordnet. Im geschlossenen Zustand liegt die kegelförmige Dichtfläche des Ventilkörpers 22 flächig am hohlke- gelartig geformten Dichtsitz 20 an. Der Ventilkörper 22 ist mit einer Federeinrichtung 24 gegen den Dichtsitz 20 des Zylindergehäuses 14 gedrückt. Diese Federeinrichtung 24 ist im gezeigten Ausführungsbeispiel durch eine Schraubenfeder 25 gebildet .2, a conical valve or sealing seat 20 and a sealing seat 20 occlusive valve body 22 are arranged with a conical sealing surface in the cylinder housing 14 of the suction valve 12. In the closed state, the conical sealing surface of the valve body 22 abuts flat against the hollow cone-shaped sealing seat 20. The valve body 22 is pressed against the sealing seat 20 of the cylinder housing 14 with a spring device 24. This spring device 24 is formed in the illustrated embodiment by a coil spring 25.
Ein Ventilschaft 26 des Ventilkörpers 22 ist in einer axialen Führung 28 gehalten, die durch eine Führungsbuchse 30 gebildet ist. Ein zylindrischer Abschnitt 32 (FIG 3) der Führungsbuchse 30 sitzt fest in einer korrespondierenden hohlzy- lindrischen Bohrung des Zylindergehäuses 14. Dabei bildet ein Absatz 34 der Führungsbuchse 30 mit größerem Durchmesser einen axialen Anschlag, bis zu dem die Führungsbuchse 30 in die Bohrung des Zylindergehäuses 14 geschoben werden kann. Stirnseitig an diesem Absatz 34 mit größerem Durchmesser ist ein Zentrierbund 36 angeordnet, der einem Ende der Schraubenfeder 25 eine Auflagefläche bietet und gleichzeitig für deren Zentrierung sorgt.A valve stem 26 of the valve body 22 is held in an axial guide 28 which is formed by a guide bush 30. A cylindrical portion 32 (FIG 3) of the guide bush 30 is firmly seated in a corresponding hollow cylindrical bore of the cylinder housing 14. In this case, a shoulder 34 of the guide bush 30 with a larger diameter forms an axial stop, up to which the guide bush 30 into the bore of the cylinder housing 14 can be pushed. On the front side of this shoulder 34 with a larger diameter, a centering collar 36 is arranged, which provides an end of the coil spring 25 has a bearing surface and at the same time ensures their centering.
Die perspektivische Ansicht der FIG 3 zeigt eine mögliche Ausgestaltung der Führungsbuchse 30, in deren Außenmantelfläche ihres zylindrischen Abschnittes 32 mehrere kerbenartige, in Draufsicht halbkreisförmige Aussparungen angeordnet sind, die gemeinsam einen axialen Durchlass 38 bilden. Dieser axiale Durchlass 38 in Form von vier symmetrisch angeordneten Zulauffenstern 40 stellt bei geöffnetem Saugventil 12 eine Verbindung zwischen dem Hochdruckraum 42 und einem Niederdruckraum 50 der Saugpumpe 16 her, was anhand der Figuren 1 und 2 verdeutlicht ist. Der hohlzylindrische Führungsdurchmesser 44 der Führungsbuchse 30 korrespondiert mit dem Außen- durchmesser des Ventilschaftes 26. Dadurch kann dieser weitgehend spielfrei, jedoch mit möglichst geringer Reibung in axialer Richtung gleiten, so dass das Ventil 10 in gewünschter Weise öffnet und schließt.The perspective view of FIG. 3 shows a possible embodiment of the guide bush 30, in whose outer circumferential surface of its cylindrical section 32 a plurality of notch-like, in plan view, semicircular recesses are arranged, which together form an axial passage 38. This axial passage 38 in the form of four symmetrically arranged inlet windows 40, with the suction valve 12 open, establishes a connection between the high-pressure chamber 42 and a low-pressure chamber 50 of the suction pump 16, as illustrated by FIGS. 1 and 2. The hollow cylindrical guide diameter 44 of the guide bush 30 corresponds to the outer diameter of the valve stem 26. As a result, it can slide in the axial direction largely free of play, but with as little friction as possible, so that the valve 10 opens and closes in the desired manner.
Eine ringförmige Stirnfläche 46 des Zentrierbundes 36 derAn annular end face 46 of the Zentrierbundes 36 of
Führungsbuchse 30 dient zur Begrenzung des axialen Hubs des Ventilkörpers 22 und bildet zu diesem Zweck einen Anschlag für eine Führungshülse 48. Die Schraubenfeder 25 wird an ih- rer der Führungsbuchse 30 abgewandten Seite von der Führungshülse 48 gehalten, die am oberen Ende des Ventilschaftes 26 fixiert ist. Liegt die der Führungsbuchse 30 zugewandte Seite der Führungshülse 48 auf der Stirnfläche 46 auf, so ist der maximale Öffnungshub des Saugventils 12 erreicht.Guide bush 30 serves to limit the axial stroke of the valve body 22 and forms for this purpose a stop for a guide sleeve 48. The coil spring 25 is at ih- rer the guide bushing 30 opposite side held by the guide sleeve 48 which is fixed to the upper end of the valve stem 26. If the guide bush 30 facing side of the guide sleeve 48 on the end face 46, so the maximum opening stroke of the suction valve 12 is reached.
Der Niederdruckraum 50 oberhalb des Ventils 10 ist nach außen durch eine Kappe 52 verschlossen. Ein Kraftstoffzulauf 54 mündet in den Niederdruckraum 50. Ein Vorteil des sehr kompakt aufgebauten Ventils 10 liegt darin, dass für dieThe low-pressure chamber 50 above the valve 10 is closed to the outside by a cap 52. A fuel inlet 54 opens into the low pressure chamber 50. An advantage of the very compact valve 10 is that for the
Niederdruckabdichtung ein einfacher Verschluss genügt. Es ist keine aufwändige Abdichtung und Fixierung der Kappe 52 erforderlich.Low pressure seal a simple closure is sufficient. There is no time-consuming sealing and fixing of the cap 52 is required.
Die einfach aufgebaute und kostengünstig herstellbare Führungsbuchse 30 dient im gezeigten Ausführungsbeispiel als Führungselement für den Saugventilschließkörper, der im vorliegenden Zusammenhang allgemein als Ventilkörper 22 bezeichnet ist. Sie dient weiterhin als Trägerelement für die Zu- lauffenster 40, als Hubbegrenzer für den maximalen Öffnungshub des Ventilkörpers 22 sowie als Federaufnahme zur Abstützung der als Schließfedereinrichtung 24 dienenden Schraubenfeder 25. The simple design and inexpensive to produce guide bush 30 is used in the embodiment shown as a guide element for the Saugventilschließkörper, which is generally referred to in the present context as the valve body 22. It also serves as a carrier element for the inlet windows 40, as a stroke limiter for the maximum opening stroke of the valve body 22 and as a spring receptacle for supporting the coil spring 25 serving as closing spring means 24.
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE200710017122 DE102007017122A1 (en) | 2007-04-11 | 2007-04-11 | Valve and pump with such a valve |
| DE102007017122.8 | 2007-04-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2008125540A1 true WO2008125540A1 (en) | 2008-10-23 |
Family
ID=39620340
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2008/054192 Ceased WO2008125540A1 (en) | 2007-04-11 | 2008-04-08 | Valve and pump having such a valve |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE102007017122A1 (en) |
| WO (1) | WO2008125540A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012072320A1 (en) * | 2010-11-30 | 2012-06-07 | Robert Bosch Gmbh | Valve, in particular an outlet valve of a hydraulic piston pump |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US302978A (en) * | 1884-08-05 | Air-compressor | ||
| US1707017A (en) * | 1926-03-29 | 1929-03-26 | Kibele Eugene | Pump valve |
| EP0159373A1 (en) * | 1984-04-21 | 1985-10-30 | Dowell Schlumberger Corporation | Positive displacement pump with frangible pressure relief disc assembly |
| US4768933A (en) * | 1987-10-19 | 1988-09-06 | Stachowiak J Edward | High pressure reciprocating pump and valve assembly therefor |
| US5230613A (en) * | 1990-07-16 | 1993-07-27 | Diesel Technology Company | Common rail fuel injection system |
| GB2267320A (en) * | 1992-05-15 | 1993-12-01 | Bosch Gmbh Robert | Pressure-equalising delivery valve assembly. |
| WO1999042725A2 (en) * | 1998-02-17 | 1999-08-26 | Continental Teves Ag & Co. Ohg | Piston pump |
| WO2004109093A1 (en) * | 2003-05-22 | 2004-12-16 | Robert Bosch Gmbh | Check valve, especially for a high pressure pump of a fuel injection device for an internal combustion engine |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB523798A (en) * | 1939-01-14 | 1940-07-23 | Greenwood & Batley Ltd | Improvements in valve devices for reciprocating pumps |
| DE10247839A1 (en) * | 2002-10-14 | 2004-04-22 | Stein, Günter | Check valve for flowable media |
| US6695007B2 (en) * | 2002-04-03 | 2004-02-24 | Gardner Denver, Inc. | Suction valve |
-
2007
- 2007-04-11 DE DE200710017122 patent/DE102007017122A1/en not_active Ceased
-
2008
- 2008-04-08 WO PCT/EP2008/054192 patent/WO2008125540A1/en not_active Ceased
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US302978A (en) * | 1884-08-05 | Air-compressor | ||
| US1707017A (en) * | 1926-03-29 | 1929-03-26 | Kibele Eugene | Pump valve |
| EP0159373A1 (en) * | 1984-04-21 | 1985-10-30 | Dowell Schlumberger Corporation | Positive displacement pump with frangible pressure relief disc assembly |
| US4768933A (en) * | 1987-10-19 | 1988-09-06 | Stachowiak J Edward | High pressure reciprocating pump and valve assembly therefor |
| US5230613A (en) * | 1990-07-16 | 1993-07-27 | Diesel Technology Company | Common rail fuel injection system |
| GB2267320A (en) * | 1992-05-15 | 1993-12-01 | Bosch Gmbh Robert | Pressure-equalising delivery valve assembly. |
| WO1999042725A2 (en) * | 1998-02-17 | 1999-08-26 | Continental Teves Ag & Co. Ohg | Piston pump |
| WO2004109093A1 (en) * | 2003-05-22 | 2004-12-16 | Robert Bosch Gmbh | Check valve, especially for a high pressure pump of a fuel injection device for an internal combustion engine |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012072320A1 (en) * | 2010-11-30 | 2012-06-07 | Robert Bosch Gmbh | Valve, in particular an outlet valve of a hydraulic piston pump |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102007017122A1 (en) | 2008-12-18 |
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