WO2018060067A1 - High pressure pump for a fuel injection system - Google Patents

High pressure pump for a fuel injection system Download PDF

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Publication number
WO2018060067A1
WO2018060067A1 PCT/EP2017/073989 EP2017073989W WO2018060067A1 WO 2018060067 A1 WO2018060067 A1 WO 2018060067A1 EP 2017073989 W EP2017073989 W EP 2017073989W WO 2018060067 A1 WO2018060067 A1 WO 2018060067A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure pump
bore
pump according
suction valve
base housing
Prior art date
Application number
PCT/EP2017/073989
Other languages
German (de)
French (fr)
Inventor
Francesco Lucarelli
Maik Sternberg
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2018060067A1 publication Critical patent/WO2018060067A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • 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
    • 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
    • F04B1/053—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with actuating or actuated elements at the inner ends of the cylinders
    • 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
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • 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
    • F04B53/20—Filtering
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/27—Fuel-injection apparatus with filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8023—Fuel injection apparatus manufacture, repair or assembly the assembly involving use of quick-acting mechanisms, e.g. clips
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/22—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
    • F02M37/32—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements
    • F02M37/34—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements by the filter structure, e.g. honeycomb, mesh or fibrous
    • 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
    • F02M59/48—Assembling; Disassembling; Replacing
    • 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
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
    • F04B9/04—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms
    • F04B9/042—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms the means being cams

Definitions

  • the invention relates to a high-pressure pump for a fuel injection system, in particular a common-rail injection system, having the features of the preamble of claim 1.
  • a high pressure pump for a fuel injection system serves to deliver fuel to high pressure.
  • the high-pressure pump has at least one pump element with a high-pressure element space, in which the fuel is compressed and then fed via a high-pressure outlet to a high-pressure reservoir, the so-called rail.
  • the filling of the high pressure element space with fuel is usually via a suction valve, which may be designed as a mechanical suction valve or as an electromagnetically actuated suction valve.
  • the electromagnetically operated suction valve can be controlled in such a way that a metering unit upstream of the suction valve can be dispensed with for quantity metering.
  • Suction valves of the aforementioned type are susceptible to particles contained in the fuel. Because these can lead to jamming of the movable valve components, so that the suction valve does not close completely. As a result, it comes to leaks and / or malfunction, which can lead to the immediate shutdown of the engine, especially in a Einempelpumpe, ie in a high-pressure pumps with only one pump element.
  • suction valves are known from the prior art, which are equipped with a sieve.
  • a suction valve equipped with a sieve or sieve element can be seen, for example, from Offenlegungsschrift DE 10 2008 042 617 A1.
  • the screen element is annular and inserted in the manner in an outer peripheral side annular groove of a valve plate, that are formed in the valve plate and serving as Zulaufbohrungen radial bores are covered by the screen element.
  • the screen element thus prevents particles contained in the fuel from being introduced into the suction valve.
  • suction valve is a suction valve integrated into the high pressure pump and a valve plate is missing.
  • a suction valve is disclosed by way of example in the published patent application DE 10 2012 210 107 AI.
  • the valve seat is formed by a housing part of the high-pressure pump, so that a separate valve plate can be omitted.
  • a sieve on the suction valve is dispensable if the suction valve is preceded by a metering unit. Because these also protect against particles, so that the metering unit is usually equipped with a sieve. However, if the metering unit is omitted, since it is, for example, an electromagnetically actuated suction valve, the harmful particles must be removed in another way.
  • the present invention has for its object to provide a high-pressure pump for a fuel injection system, which is developed such that a suction valve of the high-pressure pump, which may in particular be integrated into the high-pressure pump and / or electromagnetically actuated suction valve, effectively contained in the fuel Particles is protected.
  • the proposed for a fuel injection system, in particular a common rail injection system, high-pressure pump has a multi-part housing formed.
  • the housing comprises a base housing, in which an engine compartment is formed, and a cylinder head connected to the base housing, in which a cylinder bore for lifting receiving a pump piston is formed.
  • the pump piston defines within the cylinder bore a high-pressure element space which can be filled with fuel via a suction valve.
  • a screen element is arranged in the region of an interface between the base housing and the cylinder head in a bore of the base housing serving as inlet for the suction valve and fixed in position in the axial direction via latching means.
  • the sieve element arranged in the bore and fixed in position prevents particles contained in the fuel from entering the intake valve from the high-pressure pump. In this way it is prevented that it comes to leaks and / or malfunction of the suction valve.
  • the arrangement of the Siebelements in the base housing, in the region of the interface between the base housing and the cylinder head, facilitates the installation of the Siebelements, since the insertion of the Siebelements can be done in the bore before mounting the pump housing.
  • the sieve element used in the hole is fixed in position within the bore via locking means.
  • the latching means prevent movement of the screen element in the axial direction, so that pressure pulsations occurring in the inlet region of the high-pressure pump can not expel the screen element.
  • Pressure pulsations occurring in the inlet region of the high pressure pump are primarily due to the strokes of the pump piston and / or to the operation of the suction valve. This is particularly true when it is an electromagnetically operated suction valve that remains open to control the delivery rate of the high pressure pump through the suction phase to push an excess amount of fuel from the high pressure element space back into the inlet region.
  • the pushed back fuel quantity causes a pressure wave, which may have the result that the screen element dissolves and emigrates into the engine room of the high-pressure pump. In this case, there would be a risk of total failure of the high-pressure pump. This risk is eliminated or at least minimized by the proposed positional fixation of the sieve element.
  • the proposed positional fixation over locking means also has the advantage that a positive connection is achieved.
  • the positive connection causes a secure connection, in particular in comparison to a press connection, which only leads to a frictional connection. If only a traction is achieved, temperature changes at different expansion coefficients can lead to the termination of the frictional connection, so that the screen element is no longer fixed in position. Pressure pulsations in the inlet area can then lead to the problems already mentioned above.
  • the proposed locking connection Compared with a press connection, the proposed locking connection also has the advantage that it is particularly simple and inexpensive to produce. Because the production of the locking connection requires no additional tools. When pressing in, it usually requires a press-in, which must be kept in the factory for mounting the Siebelements.
  • the locking means comprise an outer peripheral side arranged circumferential geometry of the Siebelements, which engages latching in a bore of the base housing expanding annular groove.
  • the latching means are in this case formed integrally with the screen element, so that the mounting of the screen element is particularly simple, since only the screen element must be inserted into the bore of the base housing in such a way that the geometry arrives in latching engagement with the annular groove.
  • the circumferential geometry is formed on a portafilter of Siebelements.
  • the circumferential geometry In order to produce the latching connection, the circumferential geometry must have a certain elastic deformability. The geometry should therefore be formed on a body that has some stiffness to support the geometry. This condition is given in the portafilter.
  • the circumferential geometry has a part-circular, triangular or trapezoidal cross-section. That is, preferably, the geometry is formed as a circumferential bead, circumferential ridge or circumferential lip, further preferably, the cross-sectional area decreases radially outwardly to ensure the required elastic deformability of the geometry. At the same time, a kind of ramp is formed over the geometry, which facilitates the insertion of the sieve element into the bore and the impressing of the geometry into the annular groove.
  • the latching means comprise a snap ring which bears against an end face of the screen element facing the cylinder head.
  • the snap ring is capable of replacing a circumferential geometry formed on the sieve element as a latching means, since the snap ring can also be brought into engagement with the annular groove of the base housing which widens the bore, so that a form fit is achieved for fixing the position of the sieve element.
  • the screen element is inserted into the bore of the base housing, then the snap ring, in such a way that the snap ring engages in the annular groove latching.
  • the fixation by means of snap ring is particularly easy to produce.
  • the snap ring can also - in addition to the circumferential geometry of the sieve element - be provided as a further locking means and engage in a further annular groove within the bore of the base housing.
  • an annular shoulder for axial support of the screen element is formed within the bore of the base housing.
  • the paragraph is particularly important if the position fixation of the sieve element is to be effected solely by means of a snap ring. Because then the snap ring can be used to axially bias the sieve against the paragraph.
  • the support of the screen element is carried out on the paragraph on the portafilter. Because this has the required stiffness for support.
  • the screen element is at least partially tubular and comprises a screen fabric which can be flowed through radially. That is, the screen cloth is disposed in a peripheral portion of the tubular portion so that it can be flowed through radially.
  • a larger Siebgewebe II be realized compared to a merely end-side arrangement of the screen fabric, so that the risk of clogging of the screen element is reduced.
  • the inflowing fuel not only flows through the screen mesh but also flows around it, so that particles adhering to the screen mesh are washed away faster.
  • the screen fabric is made of a wire mesh, since this is particularly robust.
  • the mesh has a mesh size of 60 ⁇ to 250 ⁇ , in particular from 100 ⁇ to 200 ⁇ .
  • the screen fabric thus forms an impenetrable barrier to particles contained in the fuel.
  • the bore is preceded by a recess in the region of the interface into which a sealing ring is inserted.
  • the sealing ring seals the contact area between the base housing and the cylinder head.
  • the bore receiving the screen member branches off from a bore which is formed in the base housing and connects the engine compartment with a plunger chamber.
  • the bore preferably has a henkeiförmigen course, so that this hole can also be referred to as Henkelbohrung.
  • a plunger assembly which is connected to the pump piston, is preferably received in a lift-movable manner on a camshaft in order to support the pump plunger. Accordingly, lubrication and / or cooling of the plunger assembly can be effected via the fuel flowing in via the handle bore.
  • the sieve element is preferably arranged in the bore branching off from the handle bore such that a section containing the sieve cloth protrudes into the handle bore.
  • the fuel flow present in the handle bore causes any particles adhering to the sieve element to be entrained, so that the risk of clogging of the sieve element is further reduced.
  • suction valve is integrated in the cylinder head and / or is electromagnetically actuated.
  • the pump housing in particular the cylinder head of the pump housing, can be made simpler. Furthermore, the space requirement of the suction valve is reduced, so that a compact constructive arrangement is achievable. This is accompanied by a reduced length of serving as a feed bore in the cylinder head.
  • the suction valve is electromagnetically actuated, the Mengenzuflop of the fuel can be done via the suction valve. This means that a metering unit is dispensable, whereby the construction of the high-pressure pump is further simplified.
  • FIG. 1 shows a schematic longitudinal section through a preferred embodiment of a high-pressure pump according to the invention
  • Fig. 2 is an enlarged view of the screen element of the high pressure pump of FIG. 1 and
  • Fig. 3 is an enlarged view of a modified Siebelements for a high-pressure pump according to the invention.
  • the high-pressure pump according to the invention shown in FIG. 1 comprises a basic housing 1, in which an engine room 2 is formed.
  • a camshaft 24 is arranged, via which a pump piston 5 can be driven in a stroke movement.
  • the pump piston 5 is supported on the camshaft 24 via a plunger assembly 23, which is received in a liftable manner in a plunger space 22.
  • a spring 25 biases the plunger assembly 23 against the camshaft 24.
  • a cylinder bore 4 of a cylinder head 3 which is connected to the base housing 1 via an interface 8.
  • the pump piston 5 is limited within the cylinder bore 4 a high pressure element space 6, which is filled via a suction valve 7 with fuel.
  • the suction valve 7 is presently designed as an integrated suction valve 7. This means that the cylinder 4 head a valve seat 26 for a liftable valve member 27 of the suction valve 7 is formed.
  • the screen element 10 is fixed in position.
  • the position fixing is effected via latching means 11, so that a positive connection between the screen element 10 and the base housing 1 is made.
  • the screen element 10 of the high-pressure pump of FIG. 1 has a circumferential bead-like geometry 12, which is in latching engagement with an annular groove 13 of the base housing 1.
  • the geometry 12 is formed on a portafilter 14 of the screen element 10, via which the screen element 10 is at the same time axially supported on an annular shoulder 17 of the base housing 1.
  • At the support serving portion of the portafilter 14 is followed by a tubular portion with a screen fabric 18, which extends deep into the henkeiförmige bore 21.
  • FIG. 3 shows an alternative possibility for fixing the position of the sieve element 10 via latching means 11.
  • the locking means 11 here comprise a snap ring 15 which engages in the annular groove 13 of the base housing 1 latching.
  • the snap ring 15 is supported on an end face 16 of the sieve element 10 and the filter holder 14, so that it is axially biased against the shoulder 17.
  • the snap ring 15 has the advantage that the assembly of the sieve element 10 is further simplified.
  • the circumferential geometry 12 can be omitted on the portafilter 14, so that at the same time the manufacture of the screen element 10 is simplified.

Abstract

The invention relates to a high pressure pump for a fuel injection system, in particular a common rail injection system, having a multiple-piece housing, comprising a main housing (1) in which a driving mechanism chamber (2) is configured, and a cylinder head (3) which is connected to the main housing (1) and in which a cylinder bore (4) is configured for receiving a pump piston (5) such that it can perform a reciprocating movement, wherein the pump piston (5) delimits a high pressure element chamber (6) within the cylinder bore (4), which high pressure element chamber can be filled with fuel via a suction valve (7). According to the invention, a screen element (10) is arranged in a bore (9) of the main housing (1), used as an inlet for the suction valve (7), in the region of an interface (8) between the main housing (1) and the cylinder head (3), and is fixed in position in an axial direction using locking means (11).

Description

Beschreibung  description
Titel title
Hochdruckpumpe für ein Kraftstoffeinspritzsystem  High pressure pump for a fuel injection system
Die Erfindung betrifft eine Hochdruckpumpe für ein Kraftstoffeinspritzsystem, insbesondere ein Common-Rail-Einspritzsystem, mit den Merkmalen des Oberbegriffs des Anspruchs 1. The invention relates to a high-pressure pump for a fuel injection system, in particular a common-rail injection system, having the features of the preamble of claim 1.
Stand der Technik State of the art
Eine Hochdruckpumpe für ein Kraftstoffeinspritzsystem dient der Förderung von Kraftstoff auf Hochdruck. Hierzu weist die Hochdruckpumpe mindestens ein Pumpenelement mit einem Hochdruck- Elementraum auf, in dem der Kraftstoff komprimiert und anschließend über einen Hochdruckabgang einem Hochdruckspeicher, dem so genannten Rail, zugeführt wird. Die Befüllung des Hochdruck- Elementraums mit Kraftstoff erfolgt in der Regel über ein Saugventil, das als mechanisches Saugventil oder als elektromagnetisch betätigbares Saugventil ausgebildet sein kann. Das elektromagnetisch betätigbare Saugventil ist in der Weise ansteuerbar, dass eine dem Saugventil vorgeschaltete Zumesseinheit zur Mengenzumessung entfallen kann. A high pressure pump for a fuel injection system serves to deliver fuel to high pressure. For this purpose, the high-pressure pump has at least one pump element with a high-pressure element space, in which the fuel is compressed and then fed via a high-pressure outlet to a high-pressure reservoir, the so-called rail. The filling of the high pressure element space with fuel is usually via a suction valve, which may be designed as a mechanical suction valve or as an electromagnetically actuated suction valve. The electromagnetically operated suction valve can be controlled in such a way that a metering unit upstream of the suction valve can be dispensed with for quantity metering.
Saugventile der vorstehend genannten Art sind anfällig gegenüber im Kraftstoff enthaltene Partikel. Denn diese können zu einem Verklemmen der beweglichen Ventilbauteile führen, so dass das Saugventil nicht vollständig schließt. In der Folge kommt es zu Undichtigkeiten und/oder zu Fehlfunktionen, die insbesondere bei einer Einstempelpumpe, d. h. bei einer Hochdruckpumpen mit nur einem Pumpenelement, zum sofortigen Abstellen des Motors führen können. Um derartige Fehlfunktionen zu verhindern, sind aus dem Stand der Technik Saugventile bekannt, die mit einem Sieb ausgestattet sind. Ein mit einem Sieb bzw. Siebelement ausgestattetes Saugventil geht beispielhaft aus der Offenlegungsschrift DE 10 2008 042 617 AI hervor. Das Siebelement ist ringförmig ausgebildet und in der Weise in eine außenumfangseitige Ringnut einer Ventilplatte eingesetzt, dass in der Ventilplatte ausgebildete und als Zulaufbohrungen dienende Radialbohrungen von dem Siebelement abgedeckt werden. Das Siebelement verhindert somit, dass im Kraftstoff enthaltene Partikel in das Saugventil eingetragen werden. Suction valves of the aforementioned type are susceptible to particles contained in the fuel. Because these can lead to jamming of the movable valve components, so that the suction valve does not close completely. As a result, it comes to leaks and / or malfunction, which can lead to the immediate shutdown of the engine, especially in a Einempelpumpe, ie in a high-pressure pumps with only one pump element. In order to prevent such malfunctions, suction valves are known from the prior art, which are equipped with a sieve. A suction valve equipped with a sieve or sieve element can be seen, for example, from Offenlegungsschrift DE 10 2008 042 617 A1. The screen element is annular and inserted in the manner in an outer peripheral side annular groove of a valve plate, that are formed in the valve plate and serving as Zulaufbohrungen radial bores are covered by the screen element. The screen element thus prevents particles contained in the fuel from being introduced into the suction valve.
Die Anordnung eines Siebs am Saugventil ist jedoch nicht immer möglich. Dies gilt insbesondere wenn es sich bei dem Saugventil um ein in die Hochdruckpumpe integriertes Saugventil handelt und eine Ventilplatte fehlt. Ein solches Saugventil ist beispielhaft in der Offenlegungsschrift DE 10 2012 210 107 AI offenbart. Bei einem integrierten Saugventil wird der Ventilsitz durch ein Gehäuseteil der Hochdruckpumpe ausgebildet, so dass eine separate Ventilplatte entfallen kann. The arrangement of a sieve on the suction valve is not always possible. This is especially true when the suction valve is a suction valve integrated into the high pressure pump and a valve plate is missing. Such a suction valve is disclosed by way of example in the published patent application DE 10 2012 210 107 AI. In an integrated suction valve, the valve seat is formed by a housing part of the high-pressure pump, so that a separate valve plate can be omitted.
Ein Sieb am Saugventil ist verzichtbar, wenn dem Saugventil eine Zumesseinheit vorgeschaltet ist. Denn auch diese gilt es vor Partikeln zu schützen, so dass die Zumesseinheit in der Regel mit einem Sieb ausgestattet ist. Entfällt jedoch die Zumesseinheit, da es sich beispielsweise um ein elektromagnetisch betätigbares Saugventil handelt, müssen die schädlichen Partikel auf andere Weise entfernt werden. A sieve on the suction valve is dispensable if the suction valve is preceded by a metering unit. Because these also protect against particles, so that the metering unit is usually equipped with a sieve. However, if the metering unit is omitted, since it is, for example, an electromagnetically actuated suction valve, the harmful particles must be removed in another way.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eine Hochdruckpumpe für ein Kraftstoffeinspritzsystem anzugeben, die derart weiterentwickelt ist, dass ein Saugventil der Hochdruckpumpe, wobei es sich insbesondere um ein in die Hochdruckpumpe integriertes und/oder elektromagnetisch betätigbares Saugventil handeln kann, wirksam vor im Kraftstoff enthaltenen Partikeln geschützt ist. The present invention has for its object to provide a high-pressure pump for a fuel injection system, which is developed such that a suction valve of the high-pressure pump, which may in particular be integrated into the high-pressure pump and / or electromagnetically actuated suction valve, effectively contained in the fuel Particles is protected.
Zur Lösung der Aufgabe wird die Hochdruckpumpe mit den Merkmalen des Anspruchs 1 angegeben. Vorteilhafte Weiterbildungen der Erfindung sind den Unteransprüchen zu entnehmen. To solve the problem, the high pressure pump is specified with the features of claim 1. Advantageous developments of the invention can be found in the dependent claims.
Offenbarung der Erfindung Disclosure of the invention
Die für ein Kraftstoffeinspritzsystem, insbesondere ein Common- Rail-Einspritzsystem, vorgeschlagene Hochdruckpumpe weist ein mehrteilig ausgebildetes Gehäuse auf. Das Gehäuse umfasst ein Grundgehäuse, in dem ein Triebwerksraum ausgebildet ist, und einen mit dem Grundgehäuse verbundenen Zylinderkopf, in dem eine Zylinderbohrung zur hubbeweglichen Aufnahme eines Pumpenkolbens ausgebildet ist. Der Pumpenkolben begrenzt innerhalb der Zylinderbohrung einen Hochdruck- Elementraum, der über ein Saugventil mit Kraftstoff befüllbar ist. Erfindungsgemäß ist im Bereich einer Schnittstelle zwischen dem Grundgehäuse und dem Zylinderkopf in einer als Zulauf für das Saugventil dienenden Bohrung des Grundgehäuses ein Siebelement angeordnet und über Rastmittel in axialer Richtung lagefixiert. The proposed for a fuel injection system, in particular a common rail injection system, high-pressure pump has a multi-part housing formed. The housing comprises a base housing, in which an engine compartment is formed, and a cylinder head connected to the base housing, in which a cylinder bore for lifting receiving a pump piston is formed. The pump piston defines within the cylinder bore a high-pressure element space which can be filled with fuel via a suction valve. According to the invention, a screen element is arranged in the region of an interface between the base housing and the cylinder head in a bore of the base housing serving as inlet for the suction valve and fixed in position in the axial direction via latching means.
Das in der Bohrung angeordnete und lagefixierte Siebelement verhindert, dass im Kraftstoff enthaltene Partikel aus dem Zulaufbereich der Hochdruckpumpe in das Saugventil gelangen. Auf diese Weise wird verhindert, dass es zu Undichtigkeiten und/oder Fehlfunktionen des Saugventils kommt. Die Anordnung des Siebelements im Grundgehäuse, und zwar im Bereich der Schnittstelle zwischen dem Grundgehäuse und dem Zylinderkopf, erleichtert die Montage des Siebelements, da das Einsetzen des Siebelements in die Bohrung vor der Montage des Pumpengehäuses erfolgen kann. The sieve element arranged in the bore and fixed in position prevents particles contained in the fuel from entering the intake valve from the high-pressure pump. In this way it is prevented that it comes to leaks and / or malfunction of the suction valve. The arrangement of the Siebelements in the base housing, in the region of the interface between the base housing and the cylinder head, facilitates the installation of the Siebelements, since the insertion of the Siebelements can be done in the bore before mounting the pump housing.
Um die Funktion des Siebelements möglichst dauerhaft sicherzustellen, ist das in die Bohrung eingesetzte Siebelement innerhalb der Bohrung über Rastmittel lagefixiert. Die Rastmittel verhindern eine Bewegung des Siebelements in axialer Richtung, so dass im Zulaufbereich der Hochdruckpumpe auftretende Druckpulsationen das Siebelement nicht austreiben können. Im Zulaufbereich der Hochdruckpumpe auftretende Druckpulsationen sind vorrangig auf die Hubbewegungen des Pumpenkolbens und/oder auf den Betrieb des Saugventils zurückzuführen. Dies gilt im Besonderen, wenn es sich um ein elektromagnetisch betätigbares Saugventil handelt, das zur Regelung der Fördermenge der Hochdruckpumpe über die Saugphase hinweg geöffnet bleibt, um eine überschüssige Menge Kraftstoff aus dem Hochdruck- Elementraum zurück in den Zulaufbereich zu schieben. Die zurückgeschobene Kraftstoffmenge bewirkt eine Druckwelle, die zur Folge haben kann, dass sich das Siebelement löst und in den Triebwerksraum der Hochdruckpumpe auswandert. In diesem Fall bestünde die Gefahr eines Totalausfalls der Hochdruckpumpe. Diese Gefahr wird durch die vorgeschlagene Lagefixierung des Siebelements eliminiert oder zumindest minimiert. Die vorgeschlagene Lagefixierung über Rastmittel besitzt ferner den Vorteil, dass ein Formschluss erzielt wird. Der Formschluss bewirkt eine sichere Verbindung, insbesondere im Vergleich zu einer Pressverbindung, die lediglich zu einem Kraftschluss führt. Wird nur ein Kraftschluss erreicht, können Temperaturänderungen bei unterschiedlichen Ausdehnungskoeffizienten zur Aufhebung des Kraftschlusses führen, so dass das Siebelement nicht mehr lagefixiert ist. Druckpulsationen im Zulaufbereich können dann zu den bereits vorstehend genannten Problemen führen. To ensure the function of the sieve as permanent as possible, the sieve element used in the hole is fixed in position within the bore via locking means. The latching means prevent movement of the screen element in the axial direction, so that pressure pulsations occurring in the inlet region of the high-pressure pump can not expel the screen element. Pressure pulsations occurring in the inlet region of the high pressure pump are primarily due to the strokes of the pump piston and / or to the operation of the suction valve. This is particularly true when it is an electromagnetically operated suction valve that remains open to control the delivery rate of the high pressure pump through the suction phase to push an excess amount of fuel from the high pressure element space back into the inlet region. The pushed back fuel quantity causes a pressure wave, which may have the result that the screen element dissolves and emigrates into the engine room of the high-pressure pump. In this case, there would be a risk of total failure of the high-pressure pump. This risk is eliminated or at least minimized by the proposed positional fixation of the sieve element. The proposed positional fixation over locking means also has the advantage that a positive connection is achieved. The positive connection causes a secure connection, in particular in comparison to a press connection, which only leads to a frictional connection. If only a traction is achieved, temperature changes at different expansion coefficients can lead to the termination of the frictional connection, so that the screen element is no longer fixed in position. Pressure pulsations in the inlet area can then lead to the problems already mentioned above.
Gegenüber eine Pressverbindung weist die vorgeschlagene Rastverbindung zudem den Vorteil auf, dass sie besonders einfach und kostengünstig herstellbar ist. Denn die Herstellung der Rastverbindung erfordert keine zusätzlichen Werkzeuge. Beim Einpressen bedarf es in der Regel einer Einpressstation, die im Werk zur Montage des Siebelements vorgehalten werden muss. Compared with a press connection, the proposed locking connection also has the advantage that it is particularly simple and inexpensive to produce. Because the production of the locking connection requires no additional tools. When pressing in, it usually requires a press-in, which must be kept in the factory for mounting the Siebelements.
Bevorzugt umfassen die Rastmittel eine außenumfangseitig angeordnete umlaufende Geometrie des Siebelements, die in eine die Bohrung des Grundgehäuses erweiternde Ringnut verrastend eingreift. Die Rastmittel sind in diesem Fall einstückig mit dem Siebelement ausgebildet, so dass die Montage des Siebelements besonders einfach ist, da nur das Siebelement in die Bohrung des Grundgehäuses in der Weise eingesetzt werden muss, dass die Geometrie in verrastendem Eingriff mit der Ringnut gelangt. Preferably, the locking means comprise an outer peripheral side arranged circumferential geometry of the Siebelements, which engages latching in a bore of the base housing expanding annular groove. The latching means are in this case formed integrally with the screen element, so that the mounting of the screen element is particularly simple, since only the screen element must be inserted into the bore of the base housing in such a way that the geometry arrives in latching engagement with the annular groove.
Vorzugsweise ist die umlaufende Geometrie an einem Siebträger des Siebelements ausgebildet. Um die Rastverbindung herzustellen, muss die umlaufende Geometrie eine gewisse elastische Verformbarkeit aufweisen. Die Geometrie sollte daher an einem Körper ausgebildet sein, der eine gewisse Formsteifigkeit besitzt, um die Geometrie zu stützen. Diese Voraussetzung ist bei dem Siebträger gegeben. Preferably, the circumferential geometry is formed on a portafilter of Siebelements. In order to produce the latching connection, the circumferential geometry must have a certain elastic deformability. The geometry should therefore be formed on a body that has some stiffness to support the geometry. This condition is given in the portafilter.
Ferner bevorzugt weist die umlaufende Geometrie einen teilkreisförmigen, dreieckigen oder trapezförmigen Querschnitt auf. Das heißt, dass vorzugsweise die Geometrie als umlaufender Wulst, umlaufender Steg oder umlaufende Lippe ausgebildet ist, wobei weiterhin vorzugsweise die Querschnittsfläche nach radial außen abnimmt, um die erforderliche elastische Verformbarkeit der Geometrie zu gewährleisten. Zugleich wird über die Geometrie eine Art Rampe ausgeformt, die das Einsetzen des Siebelements in die Bohrung und das Eindrücken der Geometrie in die Ringnut erleichtert. Alternativ oder ergänzend wird vorgeschlagen, dass die Rastmittel einen Sprengring umfassen, der an einer dem Zylinderkopf zugewandten Stirnfläche des Siebelements anliegt. Der Sprengring vermag eine am Siebelement ausgebildete umlaufende Geometrie als Rastmittel zu ersetzen, da auch der Sprengring in Eingriff mit der die Bohrung erweiternden Ringnut des Grundgehäuses bringbar ist, so dass ein Formschluss zur Lagefixierung des Siebelements erreicht wird. In diesem Fall wird zunächst das Siebelement in die Bohrung des Grundgehäuses eingesetzt, anschließend der Sprengring, und zwar in der Weise, dass der Sprengring in die Ringnut verrastend eingreift. Die Lagefixierung mittels Sprengring ist besonders einfach herstellbar. Further preferably, the circumferential geometry has a part-circular, triangular or trapezoidal cross-section. That is, preferably, the geometry is formed as a circumferential bead, circumferential ridge or circumferential lip, further preferably, the cross-sectional area decreases radially outwardly to ensure the required elastic deformability of the geometry. At the same time, a kind of ramp is formed over the geometry, which facilitates the insertion of the sieve element into the bore and the impressing of the geometry into the annular groove. Alternatively or additionally, it is proposed that the latching means comprise a snap ring which bears against an end face of the screen element facing the cylinder head. The snap ring is capable of replacing a circumferential geometry formed on the sieve element as a latching means, since the snap ring can also be brought into engagement with the annular groove of the base housing which widens the bore, so that a form fit is achieved for fixing the position of the sieve element. In this case, first, the screen element is inserted into the bore of the base housing, then the snap ring, in such a way that the snap ring engages in the annular groove latching. The fixation by means of snap ring is particularly easy to produce.
Der Sprengring kann aber auch - ergänzend zur umlaufenden Geometrie des Siebelements - als weiteres Rastmittel vorgesehen sein und in eine weitere Ringnut innerhalb der Bohrung des Grundgehäuses eingreifen. The snap ring can also - in addition to the circumferential geometry of the sieve element - be provided as a further locking means and engage in a further annular groove within the bore of the base housing.
Vorteilhafterweise ist innerhalb der Bohrung des Grundgehäuses ein ringförmiger Absatz zur axialen Abstützung des Siebelements ausgebildet. Der Absatz ist insbesondere dann von Bedeutung, wenn die Lagefixierung des Siebelements allein über einen Sprengring bewirkt werden soll. Denn dann kann der Sprengring dazu eingesetzt werden, das Siebelement gegenüber dem Absatz axial vorzuspannen. Vorzugsweise erfolgt die Abstützung des Siebelements am Absatz über den Siebträger. Denn dieser weist die zur Abstützung erforderliche Formsteifigkeit auf. Advantageously, an annular shoulder for axial support of the screen element is formed within the bore of the base housing. The paragraph is particularly important if the position fixation of the sieve element is to be effected solely by means of a snap ring. Because then the snap ring can be used to axially bias the sieve against the paragraph. Preferably, the support of the screen element is carried out on the paragraph on the portafilter. Because this has the required stiffness for support.
Gemäß einer bevorzugten Ausführungsform der Erfindung ist das Siebelement zumindest abschnittsweise rohrförmig ausgebildet und umfasst ein Siebgewebe, das radial durchströmbar ist. Das heißt, dass das Siebgewebe in einem Umfangsbereich des rohrförmigen Abschnitts angeordnet ist, so dass es radial durchströmt werden kann. In dieser Ausgestaltung kann eine - im Vergleich zu einer lediglich stirnseitigen Anordnung des Siebgewebes - größere Siebgewebefläche realisiert werden, so dass die Gefahr eines Zusetzens des Siebelements verringert wird. Unterstützend kommt hinzu, dass der zulaufende Kraftstoff das Siebgewebe nicht nur durchströmt, sondern auch umströmt, so dass am Siebgewebe anhaftende Partikel schneller weggespült werden. Vorzugsweise ist das Siebgewebe aus einem Drahtgewebe gefertigt, da dieses besonders robust ist. According to a preferred embodiment of the invention, the screen element is at least partially tubular and comprises a screen fabric which can be flowed through radially. That is, the screen cloth is disposed in a peripheral portion of the tubular portion so that it can be flowed through radially. In this embodiment, a larger Siebgewebefläche be realized compared to a merely end-side arrangement of the screen fabric, so that the risk of clogging of the screen element is reduced. In addition, the inflowing fuel not only flows through the screen mesh but also flows around it, so that particles adhering to the screen mesh are washed away faster. Preferably, the screen fabric is made of a wire mesh, since this is particularly robust.
Weiterhin vorzugsweise besitzt das Siebgewebe eine Maschenweite von 60 μηη bis 250 μηη, insbesondere von 100 μηη bis 200 μηη. Das Siebgewebe bildet auf diese Weise eine für im Kraftstoff enthaltene Partikel undurchdringliche Barriere aus. Further preferably, the mesh has a mesh size of 60 μηη to 250 μηη, in particular from 100 μηη to 200 μηη. The screen fabric thus forms an impenetrable barrier to particles contained in the fuel.
Vorteilhafterweise ist der Bohrung im Bereich der Schnittstelle eine Ausnehmung vorgelagert, in die ein Dichtring eingesetzt ist. Der Dichtring dichtet den Kontaktbereich zwischen dem Grundgehäuse und dem Zylinderkopf ab. Advantageously, the bore is preceded by a recess in the region of the interface into which a sealing ring is inserted. The sealing ring seals the contact area between the base housing and the cylinder head.
Bevorzugt zweigt die das Siebelement aufnehmende Bohrung von einer Bohrung ab, die im Grundgehäuse ausgebildet ist und den Triebwerksraum mit einem Stößelraum verbindet. Zur Verbindung von Triebwerksraum und Stößelraum weist die Bohrung bevorzugt einen henkeiförmigen Verlauf auf, so dass diese Bohrung auch als Henkelbohrung bezeichnet werden kann. Im Stößelraum ist vorzugsweise eine mit dem Pumpenkolben verbundene Stößelbaugruppe zur Abstützung des Pumpenkolbens an einer Nockenwelle hubbeweglich aufgenommen. Über den über die Henkelbohrung zuströmenden Kraftstoff kann demnach eine Schmierung und/oder Kühlung der Stößelbaugruppe bewirkt werden. Preferably, the bore receiving the screen member branches off from a bore which is formed in the base housing and connects the engine compartment with a plunger chamber. To connect the engine room and plunger, the bore preferably has a henkeiförmigen course, so that this hole can also be referred to as Henkelbohrung. In the plunger chamber, a plunger assembly, which is connected to the pump piston, is preferably received in a lift-movable manner on a camshaft in order to support the pump plunger. Accordingly, lubrication and / or cooling of the plunger assembly can be effected via the fuel flowing in via the handle bore.
Des Weiteren bevorzugt ist das Siebelement in der Weise in der von der Henkelbohrung abzweigenden Bohrung angeordnet, dass ein das Siebgewebe aufweisender Abschnitt in die Henkelbohrung hineinragt. Die in der Henkelbohrung vorhandene Kraftstoffströmung bewirkt, dass etwaige am Siebelement anhaftende Partikel mitgerissen werden, so dass die Gefahr eines Zusetzens des Siebelements weiter gemindert wird. Furthermore, the sieve element is preferably arranged in the bore branching off from the handle bore such that a section containing the sieve cloth protrudes into the handle bore. The fuel flow present in the handle bore causes any particles adhering to the sieve element to be entrained, so that the risk of clogging of the sieve element is further reduced.
Ferner wird vorgeschlagen, dass das Saugventil in den Zylinderkopf integriert ist und/oder elektromagnetisch betätigbar ist. It is also proposed that the suction valve is integrated in the cylinder head and / or is electromagnetically actuated.
Durch die Integration des Saugventils in die Hochdruckpumpe kann das Pumpengehäuse, insbesondere der Zylinderkopf des Pumpengehäuses, einfacher gestaltet werden. Ferner reduziert sich der Bauraumbedarf des Saugventils, so dass eine kompakt bauende Anordnung erzielbar ist. Damit einher geht auch eine reduzierte Länge der als Zulauf dienenden Bohrung im Zylinderkopf. By integrating the suction valve in the high-pressure pump, the pump housing, in particular the cylinder head of the pump housing, can be made simpler. Furthermore, the space requirement of the suction valve is reduced, so that a compact constructive arrangement is achievable. This is accompanied by a reduced length of serving as a feed bore in the cylinder head.
Sofern das Saugventil elektromagnetisch betätigbar ist, kann die Mengenzumessung des Kraftstoffs über das Saugventil erfolgen. Das heißt, dass eine Zumesseinheit entbehrlich ist, wodurch der Aufbau der Hochdruckpumpe weiter vereinfacht wird. If the suction valve is electromagnetically actuated, the Mengenzumessung of the fuel can be done via the suction valve. This means that a metering unit is dispensable, whereby the construction of the high-pressure pump is further simplified.
Bevorzugte Ausführungsformen der Erfindung werden nachfolgend anhand der beigefügten Zeichnungen näher erläutert. Diese zeigen: Preferred embodiments of the invention are explained below with reference to the accompanying drawings. These show:
Fig. 1 einen schematischen Längsschnitt durch eine bevorzugte Ausführungsform einer erfindungsgemäßen Hochdruckpumpe, 1 shows a schematic longitudinal section through a preferred embodiment of a high-pressure pump according to the invention,
Fig. 2 eine vergrößerte Darstellung des Siebelements der Hochdruckpumpe der Fig. 1 und Fig. 2 is an enlarged view of the screen element of the high pressure pump of FIG. 1 and
Fig. 3 eine vergrößerte Darstellung eines abgewandelten Siebelements für eine erfindungsgemäße Hochdruckpumpe. Fig. 3 is an enlarged view of a modified Siebelements for a high-pressure pump according to the invention.
Ausführliche Beschreibung der Zeichnungen Detailed description of the drawings
Die in der Fig. 1 dargestellte erfindungsgemäße Hochdruckpumpe umfasst ein Grundgehäuse 1, in dem ein Triebwerksraum 2 ausgebildet ist. Im Triebwerksraum 2 ist eine Nockenwelle 24 angeordnet, über welche ein Pumpenkolben 5 in einer Hubbewegung antreibbar ist. Der Pumpenkolben 5 ist hierzu über eine in einem Stößelraum 22 hubbeweglich aufgenommene Stößelbaugruppe 23 an der Nockenwelle 24 abgestützt. Eine Feder 25 spannt die Stößelbaugruppe 23 gegen die Nockenwelle 24 vor. The high-pressure pump according to the invention shown in FIG. 1 comprises a basic housing 1, in which an engine room 2 is formed. In the engine room 2, a camshaft 24 is arranged, via which a pump piston 5 can be driven in a stroke movement. For this purpose, the pump piston 5 is supported on the camshaft 24 via a plunger assembly 23, which is received in a liftable manner in a plunger space 22. A spring 25 biases the plunger assembly 23 against the camshaft 24.
Andernends ist der Pumpenkolben 5 in einer Zylinderbohrung 4 eines Zylinderkopfes 3 aufgenommen, der mit dem Grundgehäuse 1 über eine Schnittstelle 8 verbunden ist. Der Pumpenkolben 5 begrenzt innerhalb der Zylinderbohrung 4 einen Hochdruck- Elementraum 6, der über ein Saugventil 7 mit Kraftstoff befüllbar ist. Das Saugventil 7 ist vorliegend als integriertes Saugventil 7 ausgebildet. Das heißt, dass der Zylinder- köpf 4 einen Ventilsitz 26 für ein hubbewegliches Ventilglied 27 des Saugventils 7 ausbildet. At the other end of the pump piston 5 is received in a cylinder bore 4 of a cylinder head 3, which is connected to the base housing 1 via an interface 8. The pump piston 5 is limited within the cylinder bore 4 a high pressure element space 6, which is filled via a suction valve 7 with fuel. The suction valve 7 is presently designed as an integrated suction valve 7. This means that the cylinder 4 head a valve seat 26 for a liftable valve member 27 of the suction valve 7 is formed.
Der Triebwerksraum 2 und der Stößelraum 22 sind über eine im Grundgehäuse 1 aus- gebildete henkeiförmige Bohrung 21 verbunden. Von der Bohrung 21 zweigt eine weitere Bohrung 9 ab, die sich vom Grundgehäuse 1 bis zur Schnittstelle 8 erstreckt und als Zulauf für das Saugventil 7 dient. In die Bohrung 9 ist ein Siebelement 10 eingesetzt, das dazu dient, im Kraftstoff enthaltene Partikel vom Saugventil 7 fernzuhalten. Das Siebelement 10 ist derart in das Grundgehäuse 1 eingebaut, dass es in die hen- kelförmige Bohrung 21 hineinragt. The engine compartment 2 and the plunger chamber 22 are connected via a henkeiförmige bore 21 formed in the base housing 1. From the bore 21 branches off a further bore 9, which extends from the base housing 1 to the interface 8 and serves as an inlet for the suction valve 7. In the bore 9, a sieve element 10 is used, which serves to keep particles contained in the fuel from the suction valve 7. The sieve element 10 is installed in the base housing 1 in such a way that it projects into the helical bore 21.
Um zu verhindern, dass das Siebelement 10 durchrutscht und über die henkeiförmige Bohrung 21 in den Triebwerksraum 2 gelangt, ist das Siebelement 10 lagefixiert. Die Lagefixierung wird über Rastmittel 11 bewirkt, so dass eine formschlüssige Verbindung zwischen dem Siebelement 10 und dem Grundgehäuse 1 besteht. In order to prevent the sieve element 10 slips and passes over the henkeiförmige bore 21 in the engine room 2, the screen element 10 is fixed in position. The position fixing is effected via latching means 11, so that a positive connection between the screen element 10 and the base housing 1 is made.
Wie insbesondere der Fig. 2 zu entnehmen ist, weist das Siebelement 10 der Hochdruckpumpe der Fig. 1 eine umlaufende wulstartige Geometrie 12 auf, die in verrastendem Eingriff mit einer Ringnut 13 des Grundgehäuses 1 steht. Die Geometrie 12 ist an einem Siebträger 14 des Siebelements 10 ausgebildet, über den das Siebelement 10 an einem ringförmigen Absatz 17 des Grundgehäuses 1 zugleich axial abgestützt ist. An den der Abstützung dienenden Abschnitt des Siebträgers 14 schließt sich ein rohr- förmiger Abschnitt mit einem Siebgewebe 18 an, der bis tief in die henkeiförmige Bohrung 21 hineinragt. 2, the screen element 10 of the high-pressure pump of FIG. 1 has a circumferential bead-like geometry 12, which is in latching engagement with an annular groove 13 of the base housing 1. The geometry 12 is formed on a portafilter 14 of the screen element 10, via which the screen element 10 is at the same time axially supported on an annular shoulder 17 of the base housing 1. At the support serving portion of the portafilter 14 is followed by a tubular portion with a screen fabric 18, which extends deep into the henkeiförmige bore 21.
Der Bohrung 9 ist im Bereich der Schnittstelle 8 eine Ausnehmung 19 vorgelagert, in die ein Dichtring 20 eingesetzt ist. Dadurch ist sichergestellt, dass der Zulaufbereich der Hochdruckpumpe nach außen abgedichtet ist. In der Fig. 3 ist eine alternative Möglichkeit der Lagefixierung des Siebelements 10 über Rastmittel 11 dargestellt. Die Rastmittel 11 umfassen hier einen Sprengring 15, der in die Ringnut 13 des Grundgehäuses 1 verrastend eingreift. Dabei stützt sich der Sprengring 15 an einer Stirnfläche 16 des Siebelements 10 bzw. des Siebträgers 14 ab, so dass dieser gegen den Absatz 17 axial vorgespannt wird. Der Sprengring 15 be- sitzt den Vorteil, dass die Montage des Siebelements 10 weiter vereinfacht wird. Ferner kann die umlaufende Geometrie 12 am Siebträger 14 entfallen, so dass zugleich die Herstellung des Siebelements 10 vereinfacht wird. The bore 9 is preceded by a recess 19 in the region of the interface 8, in which a sealing ring 20 is inserted. This ensures that the inlet area of the high pressure pump is sealed to the outside. FIG. 3 shows an alternative possibility for fixing the position of the sieve element 10 via latching means 11. The locking means 11 here comprise a snap ring 15 which engages in the annular groove 13 of the base housing 1 latching. In this case, the snap ring 15 is supported on an end face 16 of the sieve element 10 and the filter holder 14, so that it is axially biased against the shoulder 17. The snap ring 15 has the advantage that the assembly of the sieve element 10 is further simplified. Furthermore, the circumferential geometry 12 can be omitted on the portafilter 14, so that at the same time the manufacture of the screen element 10 is simplified.

Claims

Ansprüche claims
1. Hochdruckpumpe für ein Kraftstoffeinspritzsystem, insbesondere ein Common- Rail- Einspritzsystem, mit einem mehrteilig ausgebildeten Gehäuse, umfassend ein Grundgehäuse (1), in dem ein Triebwerksraum (2) ausgebildet ist, und einen mit dem Grundgehäuse (1) verbundenen Zylinderkopf (3), in dem eine Zylinderbohrung (4) zur hubbeweglichen Aufnahme eines Pumpenkolbens (5) ausgebildet ist, wobei der Pumpenkolben (5) innerhalb der Zylinderbohrung (4) einen Hochdruck- Elementraum (6) begrenzt, der über ein Saugventil (7) mit Kraftstoff befüllbar ist, 1. High-pressure pump for a fuel injection system, in particular a common rail injection system, comprising a multipart housing, comprising a base housing (1), in which an engine compartment (2) is formed, and connected to the base housing (1) cylinder head (3 ), in which a cylinder bore (4) for liftable receiving a pump piston (5) is formed, wherein the pump piston (5) within the cylinder bore (4) defines a high-pressure element space (6) via a suction valve (7) with fuel is fillable,
dadurch gekennzeichnet, dass im Bereich einer Schnittstelle (8) zwischen dem Grundgehäuse (1) und dem Zylinderkopf (3) in einer als Zulauf für das Saugventil (7) dienenden Bohrung (9) des Grundgehäuses (1) ein Siebelement (10) angeordnet und über Rastmittel (11) in axialer Richtung lagefixiert ist. characterized in that arranged in the region of an interface (8) between the base housing (1) and the cylinder head (3) serving as an inlet for the suction valve (7) bore (9) of the base housing (1) a sieve element (10) and is fixed in position in the axial direction via latching means (11).
2. Hochdruckpumpe nach Anspruch 1, 2. High-pressure pump according to claim 1,
dadurch gekennzeichnet, dass die Rastmittel (11) eine außenumfangseitig angeordnete umlaufende Geometrie (12) des Siebelements (10) umfassen, die in eine die Bohrung (9) erweiternde Ringnut (13) verrastend eingreift. characterized in that the latching means (11) comprise an outer peripheral side arranged circumferential geometry (12) of the Siebelements (10) which engages in a locking the groove (9) widening annular groove (13) latching.
3. Hochdruckpumpe nach Anspruch 2, 3. High-pressure pump according to claim 2,
dadurch gekennzeichnet, dass die Geometrie (12) an einem Siebträger (14) des Siebelements (10) ausgebildet ist und/oder einen teilkreisförmigen, dreieckigen oder trapezförmigen Querschnitt aufweist. characterized in that the geometry (12) on a portafilter (14) of the screen element (10) is formed and / or has a part-circular, triangular or trapezoidal cross-section.
4. Hochdruckpumpe nach einem der vorhergehenden Ansprüche, 4. High-pressure pump according to one of the preceding claims,
dadurch gekennzeichnet, dass die Rastmittel (11) einen Sprengring (15) umfassen, der an einer dem Zylinderkopf (3) zugewandten Stirnfläche (16) des Siebelements (10) anliegt. characterized in that the latching means (11) comprise a snap ring (15) which abuts against the cylinder head (3) facing end face (16) of the screen element (10).
5. Hochdruckpumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass innerhalb der Bohrung (9) ein ringförmiger Absatz (17) zur axialen Abstützung des Siebelements (10) ausgebildet ist, wobei vorzugsweise das Siebelement (10) über den Siebträger (14) am Absatz (17) abgestützt ist. 5. High-pressure pump according to one of the preceding claims, characterized in that within the bore (9) an annular shoulder (17) for axially supporting the Siebelements (10) is formed, wherein preferably the screen element (10) via the filter holder (14) on Paragraph (17).
6. Hochdruckpumpe nach einem der vorhergehenden Ansprüche, 6. High-pressure pump according to one of the preceding claims,
dadurch gekennzeichnet, dass das Siebelement (10) zumindest abschnittsweise rohrförmig ausgebildet ist und ein Siebgewebe (18) umfasst, das radial durchströmbar ist. characterized in that the sieve element (10) is at least partially tubular and comprises a sieve cloth (18) which can be flowed through radially.
7. Hochdruckpumpe nach Anspruch 6, 7. High-pressure pump according to claim 6,
dadurch gekennzeichnet, dass das Siebgewebe (18) aus einem Drahtgewebe gefertigt ist und/oder eine Maschenweite von 60 μηη bis 250 μηη, insbesondere von 100 μηη bis 200 μηη besitzt. characterized in that the screen fabric (18) is made of a wire mesh and / or has a mesh size of 60 μηη to 250 μηη, in particular from 100 μηη to 200 μηη.
8. Hochdruckpumpe nach einem der vorhergehenden Ansprüche, 8. High-pressure pump according to one of the preceding claims,
dadurch gekennzeichnet, dass der Bohrung (9) im Bereich der Schnittstelle (8) eine Ausnehmung (19) vorgelagert ist, in die ein Dichtring (20) eingesetzt ist. characterized in that the bore (9) in the region of the interface (8) is preceded by a recess (19) into which a sealing ring (20) is inserted.
9. Hochdruckpumpe nach einem der vorhergehenden Ansprüche, 9. High-pressure pump according to one of the preceding claims,
dadurch gekennzeichnet, dass die Bohrung (9) von einer Bohrung (21) abzweigt, die im Grundgehäuse (1) ausgebildet ist und den Triebwerksraum (2) mit einem Stößelraum (22) verbindet, in dem vorzugsweise eine mit dem Pumpenkolben (5) verbundene Stößelbaugruppe (23) zur Abstützung des Pumpenkolbens (5) an einer Nockenwelle (24) hubbeweglich aufgenommen ist. characterized in that the bore (9) branches off from a bore (21) which is formed in the base housing (1) and the engine compartment (2) with a plunger chamber (22) connects, in which preferably one with the pump piston (5) connected Plunger assembly (23) for supporting the pump piston (5) on a camshaft (24) is received liftable.
10. Hochdruckpumpe nach einem der vorhergehenden Ansprüche, 10. High-pressure pump according to one of the preceding claims,
dadurch gekennzeichnet, dass das Saugventil (7) in den Zylinderkopf (3) integriert ist und/oder elektromagnetisch betätigbar ist. characterized in that the suction valve (7) in the cylinder head (3) is integrated and / or electromagnetically actuated.
PCT/EP2017/073989 2016-09-29 2017-09-22 High pressure pump for a fuel injection system WO2018060067A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016218844.5 2016-09-29
DE102016218844.5A DE102016218844A1 (en) 2016-09-29 2016-09-29 High pressure pump for a fuel injection system

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WO2018060067A1 true WO2018060067A1 (en) 2018-04-05

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN110594063A (en) * 2018-06-12 2019-12-20 罗伯特·博世有限公司 High-pressure fuel pump

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EP1512866A2 (en) * 2003-09-03 2005-03-09 Denso Corporation Fuel injection pump having filter
EP1621765A2 (en) * 2004-07-30 2006-02-01 Siemens Aktiengesellschaft Filter element and filter device
JP2006029225A (en) * 2004-07-16 2006-02-02 Denso Corp Fluid passage insertion type filter device
DE102008042617A1 (en) 2008-10-06 2010-04-08 Robert Bosch Gmbh Fuel pump for fuel high pressure generation in e.g. common rail system, of internal-combustion engine of motor vehicle, has valve plate exhibiting circular groove that surrounds valve plate, where circular groove exhibits cylindrical form
DE102009029582A1 (en) * 2009-09-18 2011-03-24 Robert Bosch Gmbh High pressure pump for delivering fuel into combustion chamber of internal combustion engine, is provided with pump element, where fuel in intake stroke of pump piston is drawn from low pressure area over suction valve
DE102012210107A1 (en) 2012-06-15 2013-12-19 Robert Bosch Gmbh High-pressure pump for fuel injection system, has guide sleeve that is fitted directly or indirectly via valve carrier into bore for guiding valve element, and possesses feed groove in guide surface

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Publication number Priority date Publication date Assignee Title
EP1512866A2 (en) * 2003-09-03 2005-03-09 Denso Corporation Fuel injection pump having filter
JP2006029225A (en) * 2004-07-16 2006-02-02 Denso Corp Fluid passage insertion type filter device
EP1621765A2 (en) * 2004-07-30 2006-02-01 Siemens Aktiengesellschaft Filter element and filter device
DE102008042617A1 (en) 2008-10-06 2010-04-08 Robert Bosch Gmbh Fuel pump for fuel high pressure generation in e.g. common rail system, of internal-combustion engine of motor vehicle, has valve plate exhibiting circular groove that surrounds valve plate, where circular groove exhibits cylindrical form
DE102009029582A1 (en) * 2009-09-18 2011-03-24 Robert Bosch Gmbh High pressure pump for delivering fuel into combustion chamber of internal combustion engine, is provided with pump element, where fuel in intake stroke of pump piston is drawn from low pressure area over suction valve
DE102012210107A1 (en) 2012-06-15 2013-12-19 Robert Bosch Gmbh High-pressure pump for fuel injection system, has guide sleeve that is fitted directly or indirectly via valve carrier into bore for guiding valve element, and possesses feed groove in guide surface

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110594063A (en) * 2018-06-12 2019-12-20 罗伯特·博世有限公司 High-pressure fuel pump

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