EP3061967B1 - Pump, in particular high-pressure fuel pump - Google Patents

Pump, in particular high-pressure fuel pump Download PDF

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Publication number
EP3061967B1
EP3061967B1 EP16150017.8A EP16150017A EP3061967B1 EP 3061967 B1 EP3061967 B1 EP 3061967B1 EP 16150017 A EP16150017 A EP 16150017A EP 3061967 B1 EP3061967 B1 EP 3061967B1
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EP
European Patent Office
Prior art keywords
pump
closure element
valve
housing part
base region
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.)
Active
Application number
EP16150017.8A
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German (de)
French (fr)
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EP3061967A1 (en
Inventor
Achim Koehler
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP3061967A1 publication Critical patent/EP3061967A1/en
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Classifications

    • 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
    • F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
    • F04B11/0008—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using accumulators
    • F04B11/0033—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using accumulators with a mechanical spring
    • 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
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • 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
    • 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
    • F02M2200/03—Fuel-injection apparatus having means for reducing or avoiding stress, e.g. the stress caused by mechanical force, by fluid pressure or by temperature variations
    • 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
    • F02M2200/26—Fuel-injection apparatus with elastically deformable elements other than coil springs
    • 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
    • F02M2200/90—Selection of particular materials
    • F02M2200/9015—Elastomeric or plastic materials
    • 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
    • F02M59/485—Means for fixing delivery valve casing and barrel to each other or to pump casing

Definitions

  • the invention relates to a pump, in particular high-pressure fuel pump, according to the preamble of claim 1.
  • Such a pump in the form of a high-pressure fuel pump is through DE 199 07 869 A1 known.
  • This pump has at least one pump element with a driven in a stroke pump piston, which limits a pump chamber in a housing part of the pump.
  • the pump working space can be connected via an inlet valve with an inlet for the pumped medium.
  • the inlet opens into a limited by the housing part of the pump and a cup-shaped closure element connected thereto suction space.
  • the volume of the suction chamber is changed by the opening and closing of the inlet valve, whereby pressure pulsations are generated.
  • a membrane is used, which is elastically deformable and by which the volume of the suction chamber is changeable. By running as a separate part membrane manufacturing and assembly of the known pump is expensive.
  • a pump in the form of a high-pressure fuel pump which has a pump element with a driven in a stroke pump piston, which limits a pump chamber in a housing part of the pump.
  • the pump working space can be connected via an inlet valve with an inlet for the pumped medium.
  • the inlet opens into a suction chamber defined by the housing part of the pump and a closure element connected thereto.
  • the volume of the suction chamber is changed by the opening and closing of the inlet valve, whereby pressure pulsations are generated.
  • membrane are used in this known pump in the suction chamber, which are elastically deformable and by which the volume of the suction chamber is changeable.
  • a pump in the form of a high-pressure fuel pump which has a pump element with a driven in a stroke pump piston, which limits a pump chamber in a housing part of the pump.
  • the pump working space can be connected via an inlet valve with an inlet for the pumped medium.
  • the inlet opens into a limited by the housing part of the pump and a cup-shaped closure element connected thereto suction space.
  • the volume of the suction chamber is changed by the opening and closing of the inlet valve, whereby pressure pulsations are generated against which no measures are provided in this known pump.
  • the pump according to the invention with the features of claim 1 has the advantage that their manufacture and assembly is simplified because to reduce the pressure pulsations no additional component is required by the elastically deformable bottom portion of the closure element is used for this purpose.
  • FIG. 1 a schematic longitudinal section through a high-pressure pump
  • FIG. 2 in an enlarged view a in FIG. 1 labeled II section of the pump with a closure element according to a first embodiment
  • FIG. 3 the closure element according to a second embodiment
  • FIG. 4 the detail II with a third embodiment of the pump.
  • a pump which is a high-pressure fuel pump for fuel delivery in a fuel injection system of an internal combustion engine.
  • the pump has at least one pump element 10, which in turn has a pump piston 12 which is driven by a drive in a lifting movement, is guided in a cylinder bore 14 of a housing part 16 of the high-pressure pump and limits a pump working chamber 18 in the cylinder bore 14.
  • a drive shaft 20 may be provided with a cam 22 or eccentric on which the pump piston 12 is supported directly or via a plunger, for example a roller tappet.
  • the pump working chamber 18 can be connected to a fuel inlet 26 via an inlet valve 24 and via an outlet valve 28 to a reservoir 30.
  • the pump working chamber 18 can be filled with fuel when the inlet valve 24 is open.
  • fuel is expelled from the pump working chamber 18 through the open outlet valve 28 and conveyed into the reservoir 30 when the inlet valve 24 is closed.
  • FIG. 2 a section of the pump is shown with a portion of the housing part 16, in which the inlet valve 24 is arranged.
  • the inlet valve 24 has a valve housing 34 which is inserted into the through hole 32 forming a receptacle for the valve housing 34, wherein the valve housing 34 has a larger diameter than the cylinder bore 14 and at an annular shoulder formed at the transition from the cylinder bore 14 to the through hole 32 36 comes to the plant.
  • the valve housing 34 can rest directly or via a sealing element 38 on the annular shoulder 36.
  • valve housing 34 is held in the housing part 16 by means of a fastening element, which is designed, for example, as a screw 40 screwed into the through-bore 32. Between the outer jacket of the valve housing 34 and the through hole 32, an annular space 42 is formed, in which the inlet 26 opens.
  • the valve housing 34 has a central bore 44, which extends at least approximately coaxially to the cylinder bore 14 and the through hole 32 and in which a piston-shaped valve member 46 of the inlet valve 24 is slidably disposed.
  • the valve member 46 has a shaft 48, which is guided displaceably in the bore 44, and a larger diameter in diameter relative to the shaft 48 head 50, which projects into the pump working chamber 18.
  • the head 50 cooperates with a sealing surface 52 disposed thereon with a valve seat 54 formed on the valve housing 34.
  • one or more transverse bores 56 are provided, through which a diameter of the shaft 48 leading portion enlarged portion of the bore 44 is connected to the annular space 42.
  • valve spring 58 On the pump working chamber 18 side facing away from the valve housing 34, a valve spring 58 is arranged, which is formed as the protruding from the valve housing 34 shank 48 of the valve member 46 surrounding helical compression spring.
  • the valve spring 58 is supported on the one hand via a spring plate 60 fastened to the shaft 48 on the valve member 46 and on the other hand on the valve housing 34.
  • the screw 40 has a central opening 62 into which the protruding from the valve housing 34 end of the shaft 48 of the valve member 46 with the Spring plate 60 and the valve spring 58 protrudes.
  • a closure member 64 is arranged, through which the through hole 32 is sealed to the outside.
  • a suction chamber is limited, which comprises the annular space 42, lying within the opening 62 in the screw 40 space 66 and lying between the screw 40 and the closure member 64 space 68.
  • the space 66 and / or the space 68 is connected to the annular space 42 via at least one opening 69 in the valve housing 34 and / or in the screw 40.
  • the closure member 64 is cup-shaped and has an at least approximately cylindrical shell portion 70 and one of the screw 40 opposite end occluding bottom portion 72.
  • the cladding region 70 and the bottom portion 72 are integrally formed.
  • the housing portion 16 facing end portion of the jacket portion 70 is fixed to a through hole 32 surrounding collar 74 of the housing part 16, for example, screwed or pressed onto this.
  • an elastic sealing element 76 may be arranged between the jacket region 70 and the collar 74.
  • At least the bottom region 72 of the closure element 64 is elastically deformable, preferably such that it can bulge inward in the direction of the longitudinal axis 65 of the closure element 64 into the space 68 and outwards, as shown in FIG FIG.
  • the bottom portion 72 is formed at least approximately flat in the non-deformed state. On the one hand, to allow the elastic deformability of the bottom region 72 and, on the other hand, sufficient rigidity of the jacket region 70 for secure attachment to the housing part 16, it can be provided that the bottom region 72 has a smaller wall thickness than the jacket region 70.
  • the closure element 64 can be made of metal or plastic be.
  • the closure element 164 is shown according to a second embodiment.
  • the closure element 164 is also cup-shaped, but has an attached to the collar 74 of the housing part 16 edge portion 170 and a starting from the edge portion 170 of the screw 40 convexly outwardly curved bottom portion 172 which is elastically deformable.
  • the edge region 170 and the bottom portion 172 are integrally formed.
  • the elastic deformability of the bottom region 172 can be achieved or improved, as in the first exemplary embodiment, by means of a wall thickness of the bottom region 172 which is smaller than the edge region 170.
  • the edge region 170 can be screwed or pressed onto the collar 74 of the housing part 16.
  • the closure member 164 may also be made of metal or plastic.
  • FIG. 4 is a section of the pump according to a third embodiment shown, in which, unlike the first and second embodiments, the inlet valve 124 does not have a separate valve housing.
  • the through hole 132 adjoining the cylinder bore 14 is provided, which firstly has a bore portion 132a of smaller diameter than the cylinder bore 14 adjacent to the cylinder bore 14 and then a larger diameter bore portion 132b thereon.
  • the inlet valve 124 has the piston-shaped valve member 146, whose shaft 148 is guided in the bore portion 130 a and whose head 150 projects into the pump working space 18.
  • the head 150 cooperates with the sealing surface 152 disposed thereon with the valve seat 154, which is formed in the housing part 16 at the transition from the cylinder bore 14 to the bore portion 132a.
  • the shank 148 of the valve member 146 protrudes on the side facing away from the pump working chamber 18 from the bore portion 132a out into the bore portion 132b and on this, the spring plate 160 is fixed, on which the valve spring 158 is supported, on the other hand on the housing part 116 is supported.
  • the bore section 132b is sealed to the outside on its side remote from the bore section 132a by the closure element 64.
  • the space 142 which forms the suction space of the inlet valve 124, is delimited in the bore section 132b.
  • the inlet 26 opens into the suction chamber 142 and the suction chamber 142 is connected via one or more holes 156 with the bore portion 132 a.
  • the closure element 64 is formed as in the first or second embodiment and thus its bottom portion 72 is elastically deformable to allow volume changes of the suction chamber 142 and thereby to prevent or at least reduce pressure fluctuations in the suction chamber 142.
  • the closure element 64 is connected to a collar 174 of the housing part 116 surrounding the bore section 132b, for example screwed or pressed onto the latter. Between the collar 174 and the closure element 64, a sealing element 76 may be arranged.

Description

Die Erfindung betrifft eine Pumpe, insbesondere Kraftstoffhochdruckpumpe, gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a pump, in particular high-pressure fuel pump, according to the preamble of claim 1.

Stand der TechnikState of the art

Eine solche Pumpe in Form einer Kraftstoffhochdruckpumpe ist durch die DE 199 07 869 A1 bekannt. Diese Pumpe weist wenigstens ein Pumpenelement auf mit einem in einer Hubbewegung angetriebenen Pumpenkolben, der in einem Gehäuseteil der Pumpe einen Pumpenarbeitsraum begrenzt. Der Pumpenarbeitsraum ist über ein Einlassventil mit einem Zulauf für das Fördermedium verbindbar. Der Zulauf mündet in einem durch das Gehäuseteil der Pumpe und ein mit diesem verbundenes topfförmiges Verschlusselement begrenzten Saugraum. Im Betrieb der Pumpe wird das Volumen des Saugraums durch das Öffnen und Schließen des Einlassventils verändert, wodurch Druckpulsationen erzeugt werden. Zur Verringerung der Druckpulsationen ist bei dieser bekannten Pumpe im Saugraum eine Membran eingesetzt, die elastisch verformbar ist und durch die das Volumen des Saugraums änderbar ist. Durch die als separates Teil ausgeführte Membran ist die Fertigung und Montage der bekannten Pumpe aufwendig.Such a pump in the form of a high-pressure fuel pump is through DE 199 07 869 A1 known. This pump has at least one pump element with a driven in a stroke pump piston, which limits a pump chamber in a housing part of the pump. The pump working space can be connected via an inlet valve with an inlet for the pumped medium. The inlet opens into a limited by the housing part of the pump and a cup-shaped closure element connected thereto suction space. During operation of the pump, the volume of the suction chamber is changed by the opening and closing of the inlet valve, whereby pressure pulsations are generated. To reduce the pressure pulsations in this known pump in the suction chamber, a membrane is used, which is elastically deformable and by which the volume of the suction chamber is changeable. By running as a separate part membrane manufacturing and assembly of the known pump is expensive.

Durch die DE 103 27 408 A1 ist eine Pumpe in Form einer Kraftstoffhochdruckpumpe bekannt, die ein Pumpenelement aufweist mit einem in einer Hubbewegung angetriebenen Pumpenkolben, der in einem Gehäuseteil der Pumpe einen Pumpenarbeitsraum begrenzt. Der Pumpenarbeitsraum ist über ein Einlassventil mit einem Zulauf für das Fördermedium verbindbar. Der Zulauf mündet in einem durch das Gehäuseteil der Pumpe und ein mit diesem verbundenes Verschlusselement begrenzten Saugraum. Im Betrieb der Pumpe wird das Volumen des Saugraums durch das Öffnen und Schließen des Einlassventils verändert, wodurch Druckpulsationen erzeugt werden. Zur Verringerung der Druckpulsationen sind bei dieser bekannten Pumpe im Saugraum Membrane eingesetzt, die elastisch verformbar sind und durch die das Volumen des Saugraums änderbar ist. Durch die als separate Teile ausgeführte Membrane ist die Fertigung und Montage auch bei dieser bekannten Pumpe aufwendig.By the DE 103 27 408 A1 a pump in the form of a high-pressure fuel pump is known, which has a pump element with a driven in a stroke pump piston, which limits a pump chamber in a housing part of the pump. The pump working space can be connected via an inlet valve with an inlet for the pumped medium. The inlet opens into a suction chamber defined by the housing part of the pump and a closure element connected thereto. During operation of the pump, the volume of the suction chamber is changed by the opening and closing of the inlet valve, whereby pressure pulsations are generated. To reduce the pressure pulsations membrane are used in this known pump in the suction chamber, which are elastically deformable and by which the volume of the suction chamber is changeable. By running as separate parts membrane manufacturing and assembly is complicated even in this known pump.

Durch die DE 10 2004 013 244 A1 ist eine Pumpe in Form einer Kraftstoffhochdruckpumpe bekannt, die ein Pumpenelement aufweist mit einem in einer Hubbewegung angetriebenen Pumpenkolben, der in einem Gehäuseteil der Pumpe einen Pumpenarbeitsraum begrenzt. Der Pumpenarbeitsraum ist über ein Einlassventil mit einem Zulauf für das Fördermedium verbindbar. Der Zulauf mündet in einem durch das Gehäuseteil der Pumpe und ein mit diesem verbundenes topfförmiges Verschlusselement begrenzten Saugraum. Im Betrieb der Pumpe wird das Volumen des Saugraums durch das Öffnen und Schließen des Einlassventils verändert, wodurch Druckpulsationen erzeugt werden, gegen die bei dieser bekannten Pumpe keine Maßnahmen vorgesehen sind.By the DE 10 2004 013 244 A1 a pump in the form of a high-pressure fuel pump is known, which has a pump element with a driven in a stroke pump piston, which limits a pump chamber in a housing part of the pump. The pump working space can be connected via an inlet valve with an inlet for the pumped medium. The inlet opens into a limited by the housing part of the pump and a cup-shaped closure element connected thereto suction space. In operation of the pump, the volume of the suction chamber is changed by the opening and closing of the inlet valve, whereby pressure pulsations are generated against which no measures are provided in this known pump.

Offenbarung der ErfindungDisclosure of the invention Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Pumpe mit den Merkmalen des Anspruchs 1 hat demgegenüber den Vorteil, dass deren Fertigung und Montage vereinfacht ist, da zur Verringerung der Druckpulsationen kein zusätzliches Bauteil erforderlich ist indem der elastisch verformbare Bodenbereich des Verschlusselements hierzu genutzt wird.The pump according to the invention with the features of claim 1 has the advantage that their manufacture and assembly is simplified because to reduce the pressure pulsations no additional component is required by the elastically deformable bottom portion of the closure element is used for this purpose.

In den abhängigen Ansprüchen sind vorteilhafte Ausgestaltungen und Weiterbildungen der erfindungsgemäßen Pumpe angegeben. In den Ansprüchen 2 bis 4 sind konstruktiv einfache Ausbildungen des Verschlusselements angegeben um dessen elastische Verformbarkeit zu erreichen. Durch die Ausbildung gemäß Anspruch 5 wird die elastische Verformbarkeit weiter verbessert und auf den Bodenbereich des Verschlusselements konzentriert. In den Ansprüchen 6 bis 8 ist eine Anwendung des Verschlusselements bei einem Einlassventil mit separatem Ventilgehäuse angegeben. Im Anspruch 9 ist eine Anwendung des Verschlusselements bei einem in das Gehäuseteil der Pumpe integrierten Einlassventil angegeben.In the dependent claims advantageous refinements and developments of the pump according to the invention are given. In the claims 2 to 4 structurally simple embodiments of the closure element are given to achieve its elastic deformability. The embodiment according to claim 5, the elastic deformability is further improved and concentrated on the bottom portion of the closure element. In claims 6 to 8, an application of the closure element in an inlet valve with a separate valve housing is specified. In claim 9 is an application of the closure element indicated in an integrated in the housing part of the pump inlet valve.

Zeichnungdrawing

Mehrere Ausführungsbeispiele der Erfindung werden nachfolgend anhand der beigefügten Zeichnung näher beschrieben. Es zeigen Figur 1 einen schematischen Längsschnitt durch eine Hochdruckpumpe, Figur 2 in vergrößerter Darstellung einen in Figur 1 mit II bezeichneten Ausschnitt der Pumpe mit einem Verschlusselement gemäß einem ersten Ausführungsbeispiel, Figur 3 das Verschlusselement gemäß einem zweiten Ausführungsbeispiel und Figur 4 den Ausschnitt II mit einem dritten Ausführungsbeispiel der Pumpe.Several embodiments of the invention are described below with reference to the accompanying drawings. Show it FIG. 1 a schematic longitudinal section through a high-pressure pump, FIG. 2 in an enlarged view a in FIG. 1 labeled II section of the pump with a closure element according to a first embodiment, FIG. 3 the closure element according to a second embodiment and FIG. 4 the detail II with a third embodiment of the pump.

Beschreibung der AusführungsbeispieleDescription of the embodiments

In den Figuren 1 bis 4 ist ausschnittsweise eine Pumpe dargestellt, die eine Kraftstoffhochdruckpumpe zur Kraftstoffförderung in einem Kraftstoffeinspritzsystem einer Brennkraftmaschine ist. Die Pumpe weist wenigstens ein Pumpenelement 10 auf, das wiederum einen Pumpenkolben 12 aufweist, der durch einen Antrieb in einer Hubbewegung angetrieben wird, in einer Zylinderbohrung 14 eines Gehäuseteils 16 der Hochdruckpumpe geführt ist und in der Zylinderbohrung 14 einen Pumpenarbeitsraum 18 begrenzt. Als Antrieb für den Pumpenkolben 12 kann eine Antriebswelle 20 mit einem Nocken 22 oder Exzenter vorgesehen sein, an dem sich der Pumpenkolben 12 direkt oder über einen Stößel, beispielsweise einen Rollenstößel, abstützt. Der Pumpenarbeitsraum 18 ist über ein Einlassventil 24 mit einem Kraftstoffzulauf 26 verbindbar und über ein Auslassventil 28 mit einem Speicher 30. Beim Saughub des Pumpenkolbens 12 kann der Pumpenarbeitsraum 18 bei geöffnetem Einlassventil 24 mit Kraftstoff befüllt werden. Beim Förderhub des Pumpenkolbens 12 wird durch diesen bei geschlossenem Einlassventil 24 Kraftstoff aus dem Pumpenarbeitsraum 18 durch das geöffnete Auslassventil 28 verdrängt und in den Speicher 30 gefördert.In the FIGS. 1 to 4 is fragmentary illustrated a pump, which is a high-pressure fuel pump for fuel delivery in a fuel injection system of an internal combustion engine. The pump has at least one pump element 10, which in turn has a pump piston 12 which is driven by a drive in a lifting movement, is guided in a cylinder bore 14 of a housing part 16 of the high-pressure pump and limits a pump working chamber 18 in the cylinder bore 14. As a drive for the pump piston 12, a drive shaft 20 may be provided with a cam 22 or eccentric on which the pump piston 12 is supported directly or via a plunger, for example a roller tappet. The pump working chamber 18 can be connected to a fuel inlet 26 via an inlet valve 24 and via an outlet valve 28 to a reservoir 30. During the suction stroke of the pump piston 12, the pump working chamber 18 can be filled with fuel when the inlet valve 24 is open. During the delivery stroke of the pump piston 12, fuel is expelled from the pump working chamber 18 through the open outlet valve 28 and conveyed into the reservoir 30 when the inlet valve 24 is closed.

In Figur 2 ist ein Ausschnitt der Pumpe mit einem Bereich des Gehäuseteils 16 dargestellt, in dem das Einlassventil 24 angeordnet ist. Im Gehäuseteil 16 der Hochdruckpumpe schließt sich an die Zylinderbohrung 14 auf deren dem Pumpenkolben 12 abgewandter Seite eine Durchgangsbohrung 32 mit größerem Durchmesser als die Zylinderbohrung 14 an, die auf der Außenseite der Gehäuseteils 16 mündet. Das Einlassventil 24 weist ein Ventilgehäuse 34 auf, das in die eine Aufnahme für das Ventilgehäuse 34 bildende Durchgangsbohrung 32 eingesetzt ist, wobei das Ventilgehäuse 34 einen größeren Durchmesser aufweist als die Zylinderbohrung 14 und an einer am Übergang von der Zylinderbohrung 14 zur Durchgangsbohrung 32 gebildeten Ringschulter 36 zur Anlage kommt. Das Ventilgehäuse 34 kann direkt oder über ein Dichtelement 38 an der Ringschulter 36 anliegen. Das Ventilgehäuse 34 wird mittels eines Befestigungselements, das beispielsweise als in die Durchgangsbohrung 32 eingeschraubte Schraube 40 ausgebildet ist, im Gehäuseteil 16 gehalten. Zwischen dem Außenmantel des Ventilgehäuses 34 und der Durchgangsbohrung 32 ist ein Ringraum 42 gebildet, in den der Zulauf 26 mündet.In FIG. 2 a section of the pump is shown with a portion of the housing part 16, in which the inlet valve 24 is arranged. In the housing part 16 of the high pressure pump closes to the cylinder bore 14 on the pump piston 12 side facing away from a through hole 32 with a larger Diameter than the cylinder bore 14, which opens on the outside of the housing part 16. The inlet valve 24 has a valve housing 34 which is inserted into the through hole 32 forming a receptacle for the valve housing 34, wherein the valve housing 34 has a larger diameter than the cylinder bore 14 and at an annular shoulder formed at the transition from the cylinder bore 14 to the through hole 32 36 comes to the plant. The valve housing 34 can rest directly or via a sealing element 38 on the annular shoulder 36. The valve housing 34 is held in the housing part 16 by means of a fastening element, which is designed, for example, as a screw 40 screwed into the through-bore 32. Between the outer jacket of the valve housing 34 and the through hole 32, an annular space 42 is formed, in which the inlet 26 opens.

Das Ventilgehäuse 34 weist eine zentrale Bohrung 44 auf, die zumindest annähernd koaxial zur Zylinderbohrung 14 und zur Durchgangsbohrung 32 verläuft und in der ein kolbenfömig ausgebildetes Ventilglied 46 des Einlassventils 24 verschiebbar angeordnet ist. Das Ventilglied 46 weist einen Schaft 48 auf, der in der Bohrung 44 verschiebbar geführt ist, und einen im Durchmesser gegenüber dem Schaft 48 größeren Kopf 50, der in den Pumpenarbeitsraum 18 ragt. Der Kopf 50 wirkt mit einer an diesem angeordneten Dichtfläche 52 mit einem am Ventilgehäuse 34 ausgebildeten Ventilsitz 54 zusammen. Im Ventilgehäuse 34 sind eine oder mehrere Querbohrungen 56 vorgesehen, durch die ein im Durchmesser gegenüber dem den Schaft 48 führenden Abschnitt vergrößerter Abschnitt der Bohrung 44 mit dem Ringraum 42 verbunden ist.The valve housing 34 has a central bore 44, which extends at least approximately coaxially to the cylinder bore 14 and the through hole 32 and in which a piston-shaped valve member 46 of the inlet valve 24 is slidably disposed. The valve member 46 has a shaft 48, which is guided displaceably in the bore 44, and a larger diameter in diameter relative to the shaft 48 head 50, which projects into the pump working chamber 18. The head 50 cooperates with a sealing surface 52 disposed thereon with a valve seat 54 formed on the valve housing 34. In the valve housing 34, one or more transverse bores 56 are provided, through which a diameter of the shaft 48 leading portion enlarged portion of the bore 44 is connected to the annular space 42.

Auf der dem Pumpenarbeitsraum 18 abgewandten Seite des Ventilgehäuses 34 ist eine Ventilfeder 58 angeordnet, die als den aus dem Ventilgehäuse 34 ragenden Schaft 48 des Ventilglieds 46 umgebende Schraubendruckfeder ausgebildet ist. Die Ventilfeder 58 stützt sich einerseits über einen auf dem Schaft 48 befestigten Federteller 60 am Ventilglied 46 und andererseits am Ventilgehäuse 34 ab. Durch die Ventilfeder 58 wird das Ventilglied 46 in Schließrichtung beaufschlagt, wobei das Ventilglied 46 in seiner Schließstellung mit seiner Dichtfläche 52 am Ventilsitz 54 anliegt.On the pump working chamber 18 side facing away from the valve housing 34, a valve spring 58 is arranged, which is formed as the protruding from the valve housing 34 shank 48 of the valve member 46 surrounding helical compression spring. The valve spring 58 is supported on the one hand via a spring plate 60 fastened to the shaft 48 on the valve member 46 and on the other hand on the valve housing 34. By the valve spring 58, the valve member 46 is acted upon in the closing direction, wherein the valve member 46 rests in its closed position with its sealing surface 52 on the valve seat 54.

Die Schraube 40 weist eine zentrale Öffnung 62 auf, in die das aus dem Ventilgehäuse 34 herausstehende Ende des Schafts 48 des Ventilglieds 46 mit dem Federteller 60 und der Ventilfeder 58 hineinragt. Auf der dem Ventilgehäuse 34 abgewandten Seite der Schraube 40 ist ein Verschlusselement 64 angeordnet, durch das die Durchgangsbohrung 32 nach außen dicht verschlossen wird. Durch das Gehäuseteil 16 und das Verschlusselement 64 wird ein Saugraum begrenzt, der den Ringraum 42, den innerhalb der Öffnung 62 in der Schraube 40 liegenden Raum 66 sowie den zwischen der Schraube 40 und dem Verschlusselement 64 liegenden Raum 68 umfasst. Der Raum 66 und/oder der Raum 68 ist über wenigstens eine Öffnung 69 im Ventilgehäuse 34 und/oder in der Schraube 40 mit dem Ringraum 42 verbunden.The screw 40 has a central opening 62 into which the protruding from the valve housing 34 end of the shaft 48 of the valve member 46 with the Spring plate 60 and the valve spring 58 protrudes. On the side facing away from the valve housing 34 of the screw 40, a closure member 64 is arranged, through which the through hole 32 is sealed to the outside. By the housing part 16 and the closure member 64, a suction chamber is limited, which comprises the annular space 42, lying within the opening 62 in the screw 40 space 66 and lying between the screw 40 and the closure member 64 space 68. The space 66 and / or the space 68 is connected to the annular space 42 via at least one opening 69 in the valve housing 34 and / or in the screw 40.

Bei einem in Figur 2 dargestellten ersten Ausführungsbeispiel ist das Verschlusselement 64 topfförmig ausgebildet und weist einen zumindest annähernd zylinderförmigen Mantelbereich 70 und einen dessen der Schraube 40 abgewandtes Ende verschließenden Bodenbereich 72 auf. Wie in Figur 2 dargestellt sind der Mantelbereich 70 und der Bodenbereich 72 einstückig ausgebildet. Der dem Gehäuseteil 16 zugewandte Endbereich des Mantelbereichs 70 ist auf einem die Durchgangsbohrung 32 umgebenden Kragen 74 des Gehäuseteils 16 befestigt, beispielsweise auf diesen aufgeschraubt oder aufgepresst. Zwischen dem Mantelbereich 70 und dem Kragen 74 kann ein elastisches Dichtelement 76 angeordnet sein. Zumindest der Bodenbereich 72 des Verschlusselements 64 ist elastisch verformbar ausgebildet, vorzugsweise derart, dass dieser sich in Richtung der Längsachse 65 des Verschlusselements 64 nach innen in den Raum 68 und nach außen wölben kann, wie dies in Figur 2 mit gestrichelten Linien verdeutlicht ist. Der Bodenbereich 72 ist in nicht verformtem Zustand zumindest annähernd eben ausgebildet. Um einerseits die elastische Verformbarkeit des Bodenbereichs 72 und andererseits eine ausreichende Steifigkeit des Mantelbereichs 70 zur sicheren Befestigung am Gehäuseteil 16 zu ermöglichen kann vorgesehen sein, dass der Bodenbereich 72 eine geringere Wandstärke aufweist als der Mantelbereich 70. Das Verschlusselement 64 kann aus Metall oder Kunststoff hergestellt sein.At an in FIG. 2 illustrated first embodiment, the closure member 64 is cup-shaped and has an at least approximately cylindrical shell portion 70 and one of the screw 40 opposite end occluding bottom portion 72. As in FIG. 2 illustrated, the cladding region 70 and the bottom portion 72 are integrally formed. The housing portion 16 facing end portion of the jacket portion 70 is fixed to a through hole 32 surrounding collar 74 of the housing part 16, for example, screwed or pressed onto this. Between the jacket region 70 and the collar 74, an elastic sealing element 76 may be arranged. At least the bottom region 72 of the closure element 64 is elastically deformable, preferably such that it can bulge inward in the direction of the longitudinal axis 65 of the closure element 64 into the space 68 and outwards, as shown in FIG FIG. 2 is illustrated with dashed lines. The bottom portion 72 is formed at least approximately flat in the non-deformed state. On the one hand, to allow the elastic deformability of the bottom region 72 and, on the other hand, sufficient rigidity of the jacket region 70 for secure attachment to the housing part 16, it can be provided that the bottom region 72 has a smaller wall thickness than the jacket region 70. The closure element 64 can be made of metal or plastic be.

Im Betrieb der Pumpe treten durch die Öffnungs- und Schließbewegung des Ventilglieds 46 im Ringraum 42 und den mit diesem Räumen 66 und 68 Volumenänderungen auf, die zu Druckänderungen führen. Durch die elastische Verformbarkeit des Bodenbereichs 72 des Verschlusselements 64 kann sich das Volumen des Raums 68 ändern und entsprechend Volumen aufnehmen oder wieder abgeben, wodurch Druckschwankungen im Ringraum 42 sowie den Räumen 66,68 vermieden oder zumindest verringert werden können.During operation of the pump occur through the opening and closing movement of the valve member 46 in the annular space 42 and with this spaces 66 and 68 volume changes, which lead to pressure changes. Due to the elastic deformability of the bottom region 72 of the closure element 64, the volume of the space 68 may change and absorb or recapture corresponding volume leave, whereby pressure fluctuations in the annulus 42 and the spaces 66,68 can be avoided or at least reduced.

In Figur 3 ist das Verschlusselement 164 gemäß einem zweiten Ausführungsbeispiel dargestellt. Das Verschlusselement 164 ist dabei ebenfalls topfförmig ausgebildet, weist jedoch einen auf dem Kragen 74 des Gehäuseteils 16 befestigten Randbereich 170 und einen ausgehend vom Randbereich 170 von der Schraube 40 aus konvex nach außen gewölbten Bodenbereich 172 auf, der elastisch verformbar ist. Wie in Figur 3 dargestellt sind der Randbereich 170 und der Bodenbereich 172 einstückig ausgebildet. Die elastische Verformbarkeit des Bodenbereichs 172 kann wie beim ersten Ausführungsbeispiel durch eine gegenüber dem Randbereich 170 verringerte Wandstärke des Bodenbereichs 172 erreicht oder verbessert werden. Der Randbereich 170 kann mit dem Kragen 74 des Gehäuseteils 16 verschraubt oder auf diesen aufgepresst sein. Das Verschlusselement 164 kann auch Metall oder Kunststoff hergestellt sein.In FIG. 3 the closure element 164 is shown according to a second embodiment. The closure element 164 is also cup-shaped, but has an attached to the collar 74 of the housing part 16 edge portion 170 and a starting from the edge portion 170 of the screw 40 convexly outwardly curved bottom portion 172 which is elastically deformable. As in FIG. 3 shown, the edge region 170 and the bottom portion 172 are integrally formed. The elastic deformability of the bottom region 172 can be achieved or improved, as in the first exemplary embodiment, by means of a wall thickness of the bottom region 172 which is smaller than the edge region 170. The edge region 170 can be screwed or pressed onto the collar 74 of the housing part 16. The closure member 164 may also be made of metal or plastic.

In Figur 4 ist ein Ausschnitt der Pumpe gemäß einem dritten Ausführungsbeispiel dargestellt, bei dem abweichend zum ersten und zweiten Ausführungsbeispiel das Einlassventil 124 kein separates Ventilgehäuse aufweist. Im Gehäuseteil 116 der Pumpe ist die sich an die Zylinderbohrung 14 anschließende Durchgangsbohrung 132 vorgesehen, die an die Zylinderbohrung 14 angrenzend zunächst einen Bohrungsabschnitt 132a mit kleinerem Durchmesser als die Zylinderbohrung 14 und an diesen anschließend einen Bohrungsabschnitt 132b mit größerem Durchmesser aufweist. Das Einlassventil 124 weist das kolbenförmig ausgebildete Ventilglied 146 auf, dessen Schaft 148 im Bohrungsabschnitt 130a geführt ist und dessen Kopf 150 in den Pumpenarbeitsraum 18 ragt. Der Kopf 150 wirkt mit der an diesem angeordneten Dichtfläche 152 mit dem Ventilsitz 154 zusammen, der im Gehäuseteil 16 am Übergang von der Zylinderbohrung 14 zum Bohrungsabschnitt 132a gebildet ist.In FIG. 4 is a section of the pump according to a third embodiment shown, in which, unlike the first and second embodiments, the inlet valve 124 does not have a separate valve housing. In the housing part 116 of the pump, the through hole 132 adjoining the cylinder bore 14 is provided, which firstly has a bore portion 132a of smaller diameter than the cylinder bore 14 adjacent to the cylinder bore 14 and then a larger diameter bore portion 132b thereon. The inlet valve 124 has the piston-shaped valve member 146, whose shaft 148 is guided in the bore portion 130 a and whose head 150 projects into the pump working space 18. The head 150 cooperates with the sealing surface 152 disposed thereon with the valve seat 154, which is formed in the housing part 16 at the transition from the cylinder bore 14 to the bore portion 132a.

Der Schaft 148 des Ventilglieds 146 ragt auf der dem Pumpenarbeitsraum 18 abgewandten Seite aus dem Bohrungsabschnitt 132a heraus in den Bohrungsabschnitt 132b hinein und auf diesem ist der Federteller 160 befestigt, an dem sich die Ventilfeder 158 abstützt, die sich andererseits am Gehäuseteil 116 abstützt. Der Bohrungsabschnitt 132b ist nach außen auf dessen dem Bohrungsabschnitt 132a abgewandter Seite durch das Verschlusselement 64 dicht verschlossen. Durch das Verschlusselement 64 und das Gehäuseteil 116 wird im Bohrungsabschnitt 132b der Raum 142 begrenzt, der den Saugraum des Einlassventils 124 bildet. Der Zulauf 26 mündet in den Saugraum 142 und der Saugraum 142 ist über eine oder mehrere Bohrungen 156 mit dem Bohrungsabschnitt 132a verbunden. Bei geöffnetem Ventilglied 146 kann Kraftstoff aus dem Saugraum 142 durch die Bohrungen 156 und zwischen der Dichtfläche 152 und dem Ventilsitz 154 in den Pumpenarbeitsraum 18 strömen.The shank 148 of the valve member 146 protrudes on the side facing away from the pump working chamber 18 from the bore portion 132a out into the bore portion 132b and on this, the spring plate 160 is fixed, on which the valve spring 158 is supported, on the other hand on the housing part 116 is supported. The bore section 132b is sealed to the outside on its side remote from the bore section 132a by the closure element 64. By means of the closure element 64 and the housing part 116, the space 142, which forms the suction space of the inlet valve 124, is delimited in the bore section 132b. The inlet 26 opens into the suction chamber 142 and the suction chamber 142 is connected via one or more holes 156 with the bore portion 132 a. With the valve member 146 open, fuel can flow from the suction chamber 142 through the bores 156 and between the sealing surface 152 and the valve seat 154 into the pump working chamber 18.

Das Verschlusselement 64 ist wie beim ersten oder zweiten Ausführungsbeispiel ausgebildet und somit ist dessen Bodenbereich 72 elastisch verformbar um Volumenänderungen des Saugraums 142 zu ermöglichen und dadurch Druckschwankungen im Saugraum 142 zu verhindern oder zumindest zu verringern. Das Verschlusselement 64 ist mit einem den Bohrungsabschnitt 132b umgebenden Kragen 174 des Gehäuseteils 116 verbunden, beispielsweise auf diesen aufgeschraubt oder aufgepresst. Zwischen dem Kragen 174 und dem Verschlusselement 64 kann ein Dichtelement 76 angeordnet sein.The closure element 64 is formed as in the first or second embodiment and thus its bottom portion 72 is elastically deformable to allow volume changes of the suction chamber 142 and thereby to prevent or at least reduce pressure fluctuations in the suction chamber 142. The closure element 64 is connected to a collar 174 of the housing part 116 surrounding the bore section 132b, for example screwed or pressed onto the latter. Between the collar 174 and the closure element 64, a sealing element 76 may be arranged.

Claims (9)

  1. Pump, in particular high-pressure fuel pump, having at least one pump element (10) which has a pump piston (12), which pump piston is driven in a reciprocating movement and delimits a pump working chamber (14) in a housing part (16; 116) of the pump, having an inlet valve (24; 124), by means of which the pump working chamber (18) is connectable to a feed (26) for delivery medium, wherein the feed (26) opens into a suction chamber (42, 66, 68; 142) which is delimited by the housing part (16; 116) and by a closure element (64; 164) connected to the housing part (16; 116), wherein the closure element (64; 164) is of pot-shaped form and has a base region (72; 172) formed integrally thereon, which base region delimits the suction chamber (42, 66, 68; 142) on its side averted from the housing part (16; 116), characterized in that the base region (72; 172) of the closure element (64; 164) is elastically deformable such that the volume of the suction chamber (42, 66, 68; 142) can be changed by elastic deformation of the base region (72; 172).
  2. Pump according to Claim 1, characterized in that the closure element (64) has a shell region (70) which runs from the base region (72) toward the housing part (16; 116) and whose end region averted from the base region (72) is connected to the housing part (16; 116).
  3. Pump according to Claim 2, characterized in that the base region (72) of the closure element (64) is of at least approximately planar form, and/or in that the shell region (70) of the closure element (64) is of at least approximately cylindrical form.
  4. Pump according to Claim 1, characterized in that the base region (172) of the closure element (164) is formed so as to be convexly domed in a direction pointing away from the housing part (16; 116), and in that the closure element (164) has an edge region (170) which adjoins the base region (172) and which is connected to the housing part (16; 116).
  5. Pump according to one of Claims 1 to 4, characterized in that the base region (72; 172) of the closure element (64; 164) has a lower stiffness than the shell region (70) or the frame region (170) of the closure element (64; 164).
  6. Pump according to one of the preceding claims, characterized in that the inlet valve (24) has a valve housing (34) in which a valve element (46) is guided and which is inserted into a receptacle (32) in the housing part (16) of the pump, and in that the closure element (64; 164) is arranged on that side of the valve housing (34) which is averted from the pump working chamber (18).
  7. Pump according to Claim 6, characterized in that the valve housing (34) is held by means of a fastening element (40) in the receptacle (32), and in that the closure element (64; 164) is arranged on that side of the fastening element (40) which is averted from the valve housing (34).
  8. Pump according to Claim 7, characterized in that the suction chamber (42, 66, 68) extends in the receptacle (32) so as to surround the valve housing (42) and on that side of the valve housing (34) which is averted from the pump working chamber (18), between said valve housing and the closure element (64; 164).
  9. Pump according to one of Claims 1 to 5, characterized in that the inlet valve (124) has a valve element (146) which is guided displaceably in a bore section (132a) of a passage bore (132), which adjoins the cylinder bore (14), of the housing part (116) of the pump, and in that the suction chamber (142) extends in a bore section (132b) of the passage bore (132), which bore section adjoins the side, averted from the cylinder bore (14), of the bore section (132a) that guides the valve element (146).
EP16150017.8A 2015-02-25 2016-01-04 Pump, in particular high-pressure fuel pump Active EP3061967B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102015203345.7A DE102015203345A1 (en) 2015-02-25 2015-02-25 Pump, in particular high-pressure fuel pump

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EP3061967A1 EP3061967A1 (en) 2016-08-31
EP3061967B1 true EP3061967B1 (en) 2018-08-15

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Publication number Priority date Publication date Assignee Title
IT201600114815A1 (en) * 2016-11-14 2018-05-14 Bosch Gmbh Robert PUMP ASSEMBLY TO SUPPLY FUEL, PREFERABLY GASOIL, TO AN INTERNAL COMBUSTION ENGINE
DE102017203427A1 (en) * 2017-03-02 2018-09-06 Robert Bosch Gmbh Pump element for a high-pressure pump

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Publication number Priority date Publication date Assignee Title
DE2823767A1 (en) * 1978-05-31 1979-12-06 Bosch Gmbh Robert NOISE DAMPER FOR PRESSURE VIBRATIONS OF A CONVEYOR MEDIUM
JPH11247742A (en) * 1998-03-02 1999-09-14 Zexel:Kk Plunger pump
DE10362412B3 (en) * 2002-10-19 2017-09-07 Robert Bosch Gmbh Device for damping pressure pulsations in a fluid system, in particular in a fuel system of an internal combustion engine
DE102004013244A1 (en) 2004-03-18 2005-10-06 Robert Bosch Gmbh High-pressure pump, in particular for a fuel injection device of an internal combustion engine

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EP3061967A1 (en) 2016-08-31

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