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EP3039282A1 - Pump, in particular a high-pressure fuel pump - Google Patents

Pump, in particular a high-pressure fuel pump

Info

Publication number
EP3039282A1
EP3039282A1 EP14742485.7A EP14742485A EP3039282A1 EP 3039282 A1 EP3039282 A1 EP 3039282A1 EP 14742485 A EP14742485 A EP 14742485A EP 3039282 A1 EP3039282 A1 EP 3039282A1
Authority
EP
European Patent Office
Prior art keywords
pump
low
pressure module
metering device
inlet
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.)
Granted
Application number
EP14742485.7A
Other languages
German (de)
French (fr)
Other versions
EP3039282B1 (en
Inventor
Jochen Aleker
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
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 EP3039282A1 publication Critical patent/EP3039282A1/en
Application granted granted Critical
Publication of EP3039282B1 publication Critical patent/EP3039282B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46—Valves
    • F02M59/466—Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means
    • 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.
  • a pump in the form of a high-pressure fuel pump is through the
  • This pump has a housing part in which a pump piston is movably arranged in a cylinder bore, which delimits a pump working chamber in the cylinder bore.
  • the pump has an inlet valve, which is arranged in the housing part and through which the pump working chamber can be connected to an inlet for conveying medium. In the inflow is a
  • the inlet partly runs through a low-pressure module in which the metering device is arranged and which is connected to a basic housing part of the pump. On the low-pressure module, a connection for the inlet is arranged, for example, from one
  • Feed pump can lead to low pressure module.
  • the inlet runs from the metering device in the low-pressure module through the basic housing part of the pump to the inlet valve arranged in the housing part.
  • a disadvantage of this pump is the complicated course of the inlet through the main housing part of the pump, whereby their production is complicated and expensive. If the pump is no
  • the pump according to the invention with the features of claim 1 has the advantage that the low pressure module can be easily connected directly to the housing part of the pump and no costly holes or the like are required for the feed, directly from the low pressure module by the cylindrical approach of Housing part leads to the inlet valve.
  • the pump is thus simple, inexpensive and compact in size.
  • FIG. 2 shows the pump in a view in the direction of arrow II in Figure 1
  • Figure 3 shows the pump with the low-pressure module according to a second embodiment.
  • FIG. 1 shows a pump which is in particular a high-pressure fuel pump for a fuel injection device of an internal combustion engine.
  • the pump has a housing part 10, which is referred to below as the cylinder head.
  • the cylinder head 10 has a cylinder bore 12 in which a pump penkolben 14 slidably guided tight.
  • the pump piston 14 defines with its protruding into the cylinder bore 12 end of a pump working chamber 16.
  • the protruding from the cylinder bore 12 end of the pump piston 14 is connected to a transmission device, for example in the form of a roller tappet 20.
  • the roller tappet 20 is supported on a cam 22 of a drive shaft 24, through which a rotational movement of the pump piston 14 in the cylinder bore 12 is effected during the rotational movement of the drive shaft 24.
  • the drive shaft 24 may be part of the pump or part of the internal combustion engine, such as the camshaft or another shaft.
  • the pump working chamber 16 can be connected via an inlet valve 26 to a low-pressure inlet 27 to the pump and via an outlet valve 28 to a high-pressure outlet which leads, for example, to a high-pressure accumulator 30.
  • the low-pressure inlet 27 can be fed, for example, from a feed pump, which sucks fuel from a reservoir.
  • the inlet valve 26 has a valve housing 32 and is designed as a check valve.
  • the inlet valve 26 has a piston-shaped valve member 34, which is guided via its shaft 36 in the valve housing 32 and which cooperates with a formed at its diameter in relation to the shaft 36 enlarged head 38 sealing surface with a valve housing 32 formed on the valve seat.
  • the valve member 34 is acted upon by a closing spring 40 in the closing direction.
  • the cylinder head 10 is inserted in a receptacle 44 of a basic housing of the pump or a housing of the internal combustion engine, for example, the cylinder head or engine block, wherein the receptacle 44 is formed for example as a bore.
  • the cylinder head 10 in this case has a flange-like region 46, which has a larger cross section than the receptacle 44 and on which the receptacle 44 surrounding outside rests.
  • a projecting through the receptacle 44 extension 48 connects, in which the cylinder bore 12 extends and from which the connected to the roller tappet 20 end of the pump piston 14 protrudes.
  • a hollow cylindrical projection 50 connects to the cylinder head 10, which extends at least approximately coaxial with the cylinder bore 12.
  • the valve housing 32 of the inlet valve 26 is inserted from the cylinder bore 12 facing away from the outside in the hollow cylindrical projection 50, wherein the valve housing 32 rests against an annular shoulder 52 of the cylinder head 10 formed at the transition from the cylinder bore 12 to the projection 50.
  • a closure screw 56 is inserted into the projection 50, which has an external thread which cooperates with an internal thread of the projection 50. By the screw plug 56, the valve housing 32 is pressed against the annular shoulder 52 to seal the pump working chamber 16 to the approach 50 out.
  • valve 52 may be disposed between the valve housing 32 and the annular shoulder a sealing ring.
  • the closure screw 56 has, on its inner side facing the valve housing 32, a central recess 58 in which the end of the shaft 36 of the valve member 34 projecting from the valve housing 32 and the closing spring 40 are arranged.
  • Provided in the circumference of the valve housing 32 are at least one or preferably a plurality of inlet bores 60 distributed over the circumference, through which fuel enters the inlet valve 26.
  • the valve housing 32 is surrounded in the projection 50 by an annular groove 62, into which the inlet bores 60 open.
  • the annular groove 62 is connected to the outer periphery of the lug 50 via at least one bore 64 extending through the lug 50.
  • a nozzle 66 is formed, in which the outlet valve 28 is arranged. At the nozzle 66 leading to the memory 30 hydraulic see line can be connected.
  • a low pressure module 70 is provided, through which the inlet 27 extends to the inlet valve 26.
  • the low-pressure module 70 has a module housing 72, which is connected to the cylinder head 10 and which is placed on the hollow cylindrical projection 50 of the cylinder head 10.
  • the module housing 72 is made of a lightweight material such as light metal such as aluminum or an aluminum alloy or plastic.
  • the module housing 72 has an approximately cylindrical shape, which is placed on the projection 50 of the cylinder head 10 and a recess 50 receiving the recess 74 has.
  • the module housing 72 bears against the flange-like region 46 of the cylinder head 10 and between the module housing 72 and the region 46 a sealing element 76, for example in the form of a sealing ring, is clamped.
  • the module housing 72 may, for example, be pressed onto the cylinder head 10 or fastened to the cylinder head 10 by means of a latching connection or via at least one or more screws.
  • Metering device 80 is formed, for example, as a proportional valve, can be adjusted by the differently sized flow cross-sections.
  • the metering device 80 has a housing in which a piston 82 is arranged, through which the flow cross-section between a in the
  • Metering 80 opening inlet and a laxative from this flow is set.
  • the piston 82 is displaceable against a spring 85 by means of an electrical actuator 84, for example an electromagnet.
  • an electrical actuator 84 for example an electromagnet.
  • the feed into the metering device 80 takes place at least approximately radially to the longitudinal axis 83 of the piston 82 and the drain leads at least approximately coaxially to the longitudinal axis 83 of the piston 82 from the metering device 80 and opens into the recess 74 of the module housing 72.
  • an annular space is formed, so that fuel can pass from the recess 74 via the bore 64 in the projection 50 to the inlet valve 26.
  • an electrical terminal 81 is arranged for connection to an electronic control device, by which the actuator 84 is driven.
  • the metering device 80 is arranged so that the longitudinal axis 83 of the piston 82 at least approximately coaxial with the cylinder bore 12 extends.
  • the module housing 72 has an at least approximately radially to the recess 74 outwardly projecting projection 86 with a bore 87.
  • a connecting piece 88 is inserted, for example, pressed.
  • the connection piece 88 can be connected to a hydraulic line which, for example, leads from a delivery pump to the low-pressure module 70.
  • the bore 87 in the module housing 72 is connected via a further bore 89 with the metering device 80, wherein the further bore 89 in a piston 82 of the
  • the annular space 90 and the bore 87 can be arranged offset to one another in the direction of the longitudinal axis 83 of the piston 82, so that the further bore 89 extends correspondingly obliquely in the module housing 72.
  • the pump fuel passes, for example, from a supply pump from a reservoir via the connecting piece 88 into the bore 87 in the module housing 72 and from there via the further bore 89 in the annular space 90. From the annular space 90 of the fuel passes through the piston 82 of the The coaxial arrangement of the piston 82 of the metering device 80 to the inlet valve 26, which in turn is coaxial is arranged to the cylinder bore 12, a favorable inflow of the fuel is achieved. During the suction stroke of the pump piston 14, the inlet valve 26 opens, so that fuel flows into the pump working chamber 16.
  • the amount of fuel flowing into the pump working chamber 16 via the inlet valve 26 during the suction stroke of the pump piston 14 depends on the flow cross section set by the piston 82 of the metering device 80. If no fuel is to be delivered by the pump, the metering device 80 is closed so that it blocks the flow cross-section. If, due to leakage of the metering device, fuel still reaches the pump and is pumped through it, the excess fuel delivered can be discharged by suitable measures in the fuel injector.
  • a spill valve may be arranged by the pump from the pump too much subsidized fuel, not by the
  • Metering device 80 is supplied to the pump, can be derived.
  • the overflow valve is not arranged on the low pressure module 70, but for example on the feed pump.
  • the connecting piece 88 is arranged as the only hydraulic connection and the electrical connection 81 for the
  • Metering device 80 is provided. Further hydraulic connections, for example for a return, are not provided.
  • the low-pressure module 70 can be placed in any rotational positions on the cylinder head 10 due to the circular cylindrical design of the projection 50 of the cylinder head 10, via the recess 74 and existing between this and the neck 50 of the cylinder head 10 annulus always a connection between the flow of the metering device 80 and the inlet valve 26 is present.
  • FIG. 3 shows the pump with the low-pressure module 170 according to a second exemplary embodiment.
  • the cylinder head 10 of the pump is the same as in the first embodiment, but the low-pressure module 170 is formed differently and the metering device 180 is arranged differently.
  • the metering device 180 is arranged differently.
  • Module housing 172 according to the second embodiment is flatter than in the first embodiment and has a flange 173 with an opening 174, wherein the module housing 172 is mounted on the cylinder head 10 so that its opening 174 surrounds the projection 50 of the cylinder head 10. Laterally to the flange 173 then the module housing 172 has a
  • Projection 186 at the end in a bore 187 of the connecting piece 88 is inserted.
  • a further opening 178 is provided in the module housing 172, in which the
  • the opening 178 is aligned with its longitudinal axis at least approximately parallel to the longitudinal axis of the opening 174.
  • the bore 187 is followed in the module housing 172 by a further bore 189, which opens into a piston 82 of the metering device 80 radially surrounding annular space 190.
  • a space 191 is formed, into which the outlet of the metering device 80 opens and which is connected to a bore 192 opening into the opening 174.
  • an annular space is formed between the projection 50 and the opening 174 in the flange 173 of the module housing 172.
  • a sealing element 76 is arranged between the flange 173 of the module housing 172 and the flange-like region 46 of the cylinder head 10.
  • a sealing element 193 for example in the form of a sealing ring arranged.
  • a sealing element 194 for example in the form of a sealing ring, is arranged between the closure screw 56 and the inner jacket of the extension 50.
  • the low-pressure module 170 can be connected as a result of the circular cylindrical design of the projection 50 of the cylinder head 10 in any rotational positions with the cylinder head 10. Irrespective of the rotational position of the low-pressure module 70, a connection between the bore 192 of the module housing 172 with the bore 64 of the projection 50 and thus with the inlet valve 26 is always present via the annular space present between the projection 50 and the opening 174 of the flange 173.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Details Of Reciprocating Pumps (AREA)

Abstract

The invention relates to a pump, in particular a high-pressure fuel pump, having a housing part (10) in which a pump piston (14) is disposed movably in a cylindrical bore (12), which pump piston (14) delimits a pump working chamber (16) in the cylindrical bore (12). An inlet valve (26), by which the pump working chamber (16) can be connected to an intake (27), is disposed in the housing part (10). A metering device (80), by which the amount of conveying medium delivered to the pump working chamber (16) is variably adjustable, is provided in the intake (27). The intake (27) extends at least partially in a low-pressure module (70; 170) connected to the pump, and the metering device (80) is disposed on the low-pressure module (70). The housing part (10) has a hollow cylindrical projection (50) which adjoins the cylindrical bore (12) and in which the inlet valve (26) is disposed. The low-pressure module (70) is fitted onto the hollow cylindrical projection (50) of the housing part (10) and the intake extends from the metering device (80) to the inlet valve (26) through the hollow cylindrical projection (50).

Description

Beschreibung Titel  Description title
Pumpe, insbesondere eine Kraftstoffhochdruckpumpe Stand der Technik  Pump, in particular a high-pressure fuel pump prior art
Die Erfindung geht aus von einer Pumpe, insbesondere Kraftstoffhochdruckpumpe, nach der Gattung des Anspruchs 1. Eine solche Pumpe in Form einer Kraftstoffhochdruckpumpe ist durch die 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 the
DE 10 2011 087 701 AI bekannt. Diese Pumpe weist ein Gehäuseteil auf, in dem in einer Zylinderbohrung ein Pumpenkolben beweglich angeordnet ist, der in der Zylinderbohrung einen Pumpenarbeitsraum begrenzt. Die Pumpe weist ein Einlassventil auf, das im Gehäuseteil angeordnet ist und durch das der Pumpenar- beitsraum mit einem Zulauf für Fördermedium verbindbar ist. Im Zulauf ist eine DE 10 2011 087 701 AI known. This pump has a housing part in which a pump piston is movably arranged in a cylinder bore, which delimits a pump working chamber in the cylinder bore. The pump has an inlet valve, which is arranged in the housing part and through which the pump working chamber can be connected to an inlet for conveying medium. In the inflow is a
Zumesseinrichtung vorgesehen, durch die die dem Pumpenarbeitsraum zugeführte Menge an Fördermedium variabel einstellbar ist. Der Zulauf verläuft teilweise durch ein Niederdruckmodul, in dem die Zumesseinrichtung angeordnet ist und das mit einem Grundgehäuseteil der Pumpe verbunden ist. Am Niederdruckmo- dul ist ein Anschluss für den Zulauf angeordnet, der beispielsweise von einerProvided metering device by which the pump working space supplied amount of fluid is variably adjustable. The inlet partly runs through a low-pressure module in which the metering device is arranged and which is connected to a basic housing part of the pump. On the low-pressure module, a connection for the inlet is arranged, for example, from one
Förderpumpe zum Niederdruckmodul führen kann. Der Zulauf verläuft von der Zumesseinrichtung im Niederdruckmodul durch das Grundgehäuseteil der Pumpe zu dem im Gehäuseteil angeordneten Einlassventil. Nachteilig bei dieser Pumpe ist der aufwendige Verlauf des Zulaufs durch das Grundgehäuseteil der Pumpe, wodurch deren Herstellung aufwendig und teuer ist. Wenn die Pumpe keinFeed pump can lead to low pressure module. The inlet runs from the metering device in the low-pressure module through the basic housing part of the pump to the inlet valve arranged in the housing part. A disadvantage of this pump is the complicated course of the inlet through the main housing part of the pump, whereby their production is complicated and expensive. If the pump is no
Grundgehäuseteil sondern nur das Gehäuseteil mit der Zylinderbohrung aufweist ist das Niederdruckmodul nicht verwendbar. Basic housing part but only has the housing part with the cylinder bore, the low pressure module is not usable.
Offenbarung der Erfindung Disclosure of the invention
Vorteile der Erfindung Die erfindungsgemäße Pumpe mit den Merkmalen gemäß Anspruch 1 hat demgegenüber den Vorteil, dass das Niederdruckmodul auf einfache Weise direkt mit dem Gehäuseteil der Pumpe verbunden werden kann und keine aufwendigen Bohrungen oder ähnliches für den Zulauf erforderlich sind, der direkt vom Niederdruckmodul durch den zylinderförmigen Ansatz des Gehäuseteils zum Einlassventil führt. Die Pumpe ist somit einfach, kostengünstig und mit kompakter Baugröße herstellbar. Advantages of the invention The pump according to the invention with the features of claim 1 has the advantage that the low pressure module can be easily connected directly to the housing part of the pump and no costly holes or the like are required for the feed, directly from the low pressure module by the cylindrical approach of Housing part leads to the inlet valve. The pump is thus simple, inexpensive and compact in size.
In den abhängigen Ansprüchen sind vorteilhafte Ausgestaltungen und Weiterbildungen der erfindungsgemäßen Pumpe angegeben. Durch die Ausbildung gemäß Anspruch 2 ist eine flexible Ausrichtung des Anschlusses für den Zulauf an der Pumpe ermöglicht. Die Ausbildung gemäß Anspruch 3 und insbesondere Anspruch 4 ermöglicht eine günstige Strömungsführung von der Zumesseinrichtung zum Einlassventil. Durch die Ausbildung gemäß Anspruch 5 ist ein geringes Gewicht und eine einfache Herstellung des Niederdruckmoduls und damit der Pumpe ermöglicht. Die Ausbildung gemäß Anspruch 7 ermöglicht eine günstige Strömungsführung im Niederdruckmodul vom Zulaufanschluss zur In the dependent claims advantageous refinements and developments of the pump according to the invention are given. Due to the design according to claim 2, a flexible alignment of the connection for the inlet to the pump is made possible. The embodiment according to claim 3 and in particular claim 4 enables a favorable flow guidance from the metering device to the inlet valve. Due to the design according to claim 5, a low weight and a simple production of the low-pressure module and thus the pump is possible. The embodiment according to claim 7 allows a favorable flow guidance in the low-pressure module from the inlet connection to
Zumesseinrichtung. Metering device.
Zeichnung drawing
Zwei Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 eine Pumpe in vereinfachter Darstellung in einem Längsschnitt mit einem dieser zugeordneten Niederdruckmodul gemäß einem ersten Ausführungsbeispiel, Figur 2 die Pumpe in einer Ansicht in Pfeilrichtung II in Figur 1 und Figur 3 die Pumpe mit dem Niederdruckmodul gemäß einem zweiten Ausführungsbeispiel. Two embodiments of the invention are illustrated in the drawing and explained in more detail in the following description. 2 shows the pump in a view in the direction of arrow II in Figure 1 and Figure 3 shows the pump with the low-pressure module according to a second embodiment.
Beschreibung der Ausführungsbeispiele Description of the embodiments
In Figur 1 ist eine Pumpe dargestellt, die insbesondere eine Kraftstoffhochdruckpumpe für eine Kraftstoffeinspritzeinrichtung einer Brennkraftmaschine ist. Die Pumpe weist ein Gehäuseteil 10 auf, das nachfolgend als Zylinderkopf bezeichnet wird. Der Zylinderkopf 10 weist eine Zylinderbohrung 12 auf, in der ein Pum- penkolben 14 verschiebbar dicht geführt ist. Der Pumpenkolben 14 begrenzt mit seinem in die Zylinderbohrung 12 ragenden Ende einen Pumpenarbeitsraum 16. Das aus der Zylinderbohrung 12 ragende Ende des Pumpenkolbens 14 ist mit einer Übertragungseinrichtung beispielsweise in Form eines Rollenstößels 20 verbunden. Der Rollenstößel 20 stützt sich an einem Nocken 22 einer Antriebswelle 24 ab, durch den bei der Drehbewegung der Antriebswelle 24 eine Hubbewegung des Pumpenkolbens 14 in der Zylinderbohrung 12 bewirkt wird. Die Antriebswelle 24 kann Teil der Pumpe sein oder Teil der Brennkraftmaschine, beispielsweise deren Nockenwelle oder eine andere Welle. FIG. 1 shows a pump which is in particular a high-pressure fuel pump for a fuel injection device of an internal combustion engine. The pump has a housing part 10, which is referred to below as the cylinder head. The cylinder head 10 has a cylinder bore 12 in which a pump penkolben 14 slidably guided tight. The pump piston 14 defines with its protruding into the cylinder bore 12 end of a pump working chamber 16. The protruding from the cylinder bore 12 end of the pump piston 14 is connected to a transmission device, for example in the form of a roller tappet 20. The roller tappet 20 is supported on a cam 22 of a drive shaft 24, through which a rotational movement of the pump piston 14 in the cylinder bore 12 is effected during the rotational movement of the drive shaft 24. The drive shaft 24 may be part of the pump or part of the internal combustion engine, such as the camshaft or another shaft.
Der Pumpenarbeitsraum 16 ist über ein Einlassventil 26 mit einem Niederdruckzulauf 27 zur Pumpe und über ein Auslassventil 28 mit einem Hochdruckablauf verbindbar, der beispielsweise zu einem Hochdruckspeicher 30 führt. Der Niederdruckzulauf 27 kann beispielsweise von einer Förderpumpe, die Kraftstoff aus einem Vorratsbehälter ansaugt, gespeist werden. Das Einlassventil 26 weist ein Ventilgehäuse 32 auf und ist als Rückschlagventil ausgebildet. Das Einlassventil 26 weist ein kolbenförmiges Ventilglied 34 auf, das über seinen Schaft 36 im Ventilgehäuse 32 geführt ist und das mit einer an seinem im Durchmesser gegenüber dem Schaft 36 vergrößerten Kopf 38 ausgebildeten Dichtfläche mit einem am Ventilgehäuse 32 ausgebildeten Ventilsitz zusammenwirkt. Das Ventilglied 34 ist durch eine Schließfeder 40 in Schließrichtung beaufschlagt. The pump working chamber 16 can be connected via an inlet valve 26 to a low-pressure inlet 27 to the pump and via an outlet valve 28 to a high-pressure outlet which leads, for example, to a high-pressure accumulator 30. The low-pressure inlet 27 can be fed, for example, from a feed pump, which sucks fuel from a reservoir. The inlet valve 26 has a valve housing 32 and is designed as a check valve. The inlet valve 26 has a piston-shaped valve member 34, which is guided via its shaft 36 in the valve housing 32 and which cooperates with a formed at its diameter in relation to the shaft 36 enlarged head 38 sealing surface with a valve housing 32 formed on the valve seat. The valve member 34 is acted upon by a closing spring 40 in the closing direction.
Der Zylinderkopf 10 ist in einer Aufnahme 44 eines Grundgehäuses der Pumpe oder eines Gehäuses der Brennkraftmaschine, beispielsweise deren Zylinderkopf oder Motorblock, eingesetzt, wobei die Aufnahme 44 beispielsweise als Bohrung ausgebildet ist. Der Zylinderkopf 10 weist dabei einen flanschartigen Bereich 46 auf, der einen größeren Querschnitt aufweist als die Aufnahme 44 und der auf der die Aufnahme 44 umgebenden Außenseite anliegt. An den flanschartigen Bereich 46 des Zylinderkopfs 10 schließt sich ein durch die Aufnahme 44 ragender Fortsatz 48 an, in dem die Zylinderbohrung 12 verläuft und aus dem das mit dem Rollenstößel 20 verbundene Ende des Pumpenkolbens 14 herausragt. Auf der dem Fortsatz 48 gegenüberliegenden Seite des flanschartigen Bereichs 48 schließt sich ein hohlzylinderförmiger Ansatz 50 am Zylinderkopf 10 an, der zumindest annähernd koaxial zur Zylinderbohrung 12 verläuft. Das Ventilgehäuse 32 des Einlassventils 26 ist von der der Zylinderbohrung 12 abgewandten Außenseite her in den hohlzylinderförmigen Ansatz 50 eingesetzt, wobei das Ventilgehäuse 32 an einer am Übergang von der Zylinderbohrung 12 zum Ansatz 50 gebildeten Ringschulter 52 des Zylinderkopfs 10 anliegt. Von der Außenseite her ist in den Ansatz 50 eine Verschlussschraube 56 eingefügt, die ein Außengewinde aufweist, welches mit einem Innengewinde des Ansatzes 50 zusammenwirkt. Durch die Verschlussschraube 56 wird das Ventilgehäuse 32 gegen die Ringschulter 52 gepresst, um den Pumpenarbeitsraum 16 zum Ansatz 50 hin abzudichten. Gegebenenfalls kann zwischen dem Ventilgehäuse 32 und der Ringschulter 52 ein Dichtring angeordnet sein. Die Verschlussschraube 56 weist auf ihrer dem Ventilgehäuse 32 zugewandten Innenseite eine zentrale Ausnehmung 58 auf, in der das aus dem Ventilgehäuse 32 ragende Ende des Schafts 36 des Ventilglieds 34 und die Schließfeder 40 angeordnet sind. Im Umfang des Ventilgehäuses 32 sind wenigstens eine oder vorzugsweise mehrere über den Umfang verteilt angeordnete Zulaufbohrungen 60 vorgesehen, durch die Kraftstoff in das Einlassventil 26 eintritt. Das Ventilgehäuse 32 ist im Ansatz 50 von einer Ringnut 62 umgeben, in die die Zulaufbohrungen 60 münden. Die Ringnut 62 ist mit dem Außenumfang des Ansatzes 50 über wenigstens eine durch den Ansatz 50 verlaufende Bohrung 64 verbunden. The cylinder head 10 is inserted in a receptacle 44 of a basic housing of the pump or a housing of the internal combustion engine, for example, the cylinder head or engine block, wherein the receptacle 44 is formed for example as a bore. The cylinder head 10 in this case has a flange-like region 46, which has a larger cross section than the receptacle 44 and on which the receptacle 44 surrounding outside rests. To the flange-like portion 46 of the cylinder head 10, a projecting through the receptacle 44 extension 48 connects, in which the cylinder bore 12 extends and from which the connected to the roller tappet 20 end of the pump piston 14 protrudes. On the opposite side of the extension 48 of the flange-like portion 48, a hollow cylindrical projection 50 connects to the cylinder head 10, which extends at least approximately coaxial with the cylinder bore 12. The valve housing 32 of the inlet valve 26 is inserted from the cylinder bore 12 facing away from the outside in the hollow cylindrical projection 50, wherein the valve housing 32 rests against an annular shoulder 52 of the cylinder head 10 formed at the transition from the cylinder bore 12 to the projection 50. From the outside, a closure screw 56 is inserted into the projection 50, which has an external thread which cooperates with an internal thread of the projection 50. By the screw plug 56, the valve housing 32 is pressed against the annular shoulder 52 to seal the pump working chamber 16 to the approach 50 out. Optionally, 52 may be disposed between the valve housing 32 and the annular shoulder a sealing ring. The closure screw 56 has, on its inner side facing the valve housing 32, a central recess 58 in which the end of the shaft 36 of the valve member 34 projecting from the valve housing 32 and the closing spring 40 are arranged. Provided in the circumference of the valve housing 32 are at least one or preferably a plurality of inlet bores 60 distributed over the circumference, through which fuel enters the inlet valve 26. The valve housing 32 is surrounded in the projection 50 by an annular groove 62, into which the inlet bores 60 open. The annular groove 62 is connected to the outer periphery of the lug 50 via at least one bore 64 extending through the lug 50.
Am Zylinderkopf 10 ist seitlich, zumindest annähernd senkrecht zur Längsachse 13 der Zylinderbohrung 12, ein Stutzen 66 ausgebildet, in dem das Auslassventil 28 angeordnet ist. Am Stutzen 66 ist eine zum Speicher 30 führende hydrauli- sehe Leitung anschließbar. On the cylinder head 10 is laterally, at least approximately perpendicular to the longitudinal axis 13 of the cylinder bore 12, a nozzle 66 is formed, in which the outlet valve 28 is arranged. At the nozzle 66 leading to the memory 30 hydraulic see line can be connected.
In den Figuren 1 und 2 ist die Pumpe gemäß einem ersten Ausführungsbeispiel dargestellt. Für den Zylinderkopf 10 ist ein Niederdruckmodul 70 vorgesehen, durch das der Zulauf 27 zum Einlassventil 26 verläuft. Das Niederdruckmodul 70 weist ein Modulgehäuse 72 auf, das mit dem Zylinderkopf 10 verbunden ist und das auf den hohlzylinderförmigen Ansatz 50 des Zylinderkopfs 10 aufgesetzt ist. Das Modulgehäuse 72 ist aus einem Werkstoff mit geringem Gewicht, beispielsweise Leichtmetall wie Aluminium oder einer Aluminiumlegierung oder aus Kunststoff hergestellt. Das Modulgehäuse 72 weist eine näherungsweise zylindrische Form auf, wobei dieses auf den Ansatz 50 des Zylinderkopfs 10 aufgesetzt ist und eine den Ansatz 50 aufnehmende Ausnehmung 74 aufweist. Das Modulgehäuse 72 liegt am flanschartigen Bereich 46 des Zylinderkopfs 10 an und zwischen dem Modulgehäuse 72 und dem Bereich 46 ist ein Dichtelement 76, beispielsweise in Form eines Dichtrings, eingespannt. Das Modulgehäuse 72 kann beispielsweise auf den Zylinderkopf 10 aufgepresst oder mittels einer Rastverbindung oder über wenigstens eine oder mehrere Schrauben am Zylinderkopf 10 befestigt sein. In Figures 1 and 2, the pump according to a first embodiment is shown. For the cylinder head 10, a low pressure module 70 is provided, through which the inlet 27 extends to the inlet valve 26. The low-pressure module 70 has a module housing 72, which is connected to the cylinder head 10 and which is placed on the hollow cylindrical projection 50 of the cylinder head 10. The module housing 72 is made of a lightweight material such as light metal such as aluminum or an aluminum alloy or plastic. The module housing 72 has an approximately cylindrical shape, which is placed on the projection 50 of the cylinder head 10 and a recess 50 receiving the recess 74 has. The module housing 72 bears against the flange-like region 46 of the cylinder head 10 and between the module housing 72 and the region 46 a sealing element 76, for example in the form of a sealing ring, is clamped. The module housing 72 may, for example, be pressed onto the cylinder head 10 or fastened to the cylinder head 10 by means of a latching connection or via at least one or more screws.
An die Ausnehmung 74 schließt sich im Modulgehäuse 72 eine Öffnung 78 an, in die eine Zumesseinrichtung 80 eingesetzt ist, die dazu dient die dem EinlassventilAdjoining the recess 74 in the module housing 72 is an opening 78 into which a metering device 80 is inserted, which serves for this purpose the inlet valve
26 zugeführte Kraftstoffmenge variabel einstellen zu können. Die 26 adjustable amount of fuel can be variably adjusted. The
Zumesseinrichtung 80 ist beispielsweise als Proportionalventil ausgebildet, durch das unterschiedlich große Durchflussquerschnitte eingestellt werden können. Die Zumesseinrichtung 80 weist ein Gehäuse auf, in dem ein Kolben 82 angeordnet ist, durch den der Durchflussquerschnitt zwischen einem in die Metering device 80 is formed, for example, as a proportional valve, can be adjusted by the differently sized flow cross-sections. The metering device 80 has a housing in which a piston 82 is arranged, through which the flow cross-section between a in the
Zumesseinrichtung 80 mündenden Zulauf und einem von dieser abführenden Ablauf eingestellt wird. Der Kolben 82 ist mittels eines elektrischen Aktors 84, beispielsweise eines Elektromagneten, gegen eine Feder 85 verschiebbar. Abhängig von der Stellung des Kolbens 82 werden durch diesen unterschiedlich große Durchflussquerschnitte eingestellt. Der Zulauf in die Zumesseinrichtung 80 erfolgt zumindest annähernd radial zur Längsachse 83 des Kolbens 82 und der Ablauf führt zumindest annähernd koaxial zur Längsachse 83 des Kolbens 82 von der Zumesseinrichtung 80 ab und mündet in der Ausnehmung 74 des Modulgehäuses 72. Zwischen dem Außenumfang des Ansatzes 50 des Zylinderkopfs 10 und der Ausnehmung 74 ist ein Ringraum gebildet, so dass Kraftstoff von der Ausnehmung 74 über die Bohrung 64 im Ansatz 50 zum Einlassventil 26 gelangen kann. An der Zumesseinrichtung 80 ist ein elektrischer Anschluss 81 zur Verbindung mit einer elektronischen Steuereinrichtung angeordnet, durch die der Aktor 84 angesteuert wird. Bei mit dem Zylinderkopf 10 verbundenem Niederdruckmo- dul 70 ist die Zumesseinrichtung 80 so angeordnet, dass die Längsachse 83 von deren Kolben 82 zumindest annähernd koaxial zur Zylinderbohrung 12 verläuft.  Metering 80 opening inlet and a laxative from this flow is set. The piston 82 is displaceable against a spring 85 by means of an electrical actuator 84, for example an electromagnet. Depending on the position of the piston 82 are set by this differently sized flow cross sections. The feed into the metering device 80 takes place at least approximately radially to the longitudinal axis 83 of the piston 82 and the drain leads at least approximately coaxially to the longitudinal axis 83 of the piston 82 from the metering device 80 and opens into the recess 74 of the module housing 72. Between the outer periphery of the projection 50th of the cylinder head 10 and the recess 74, an annular space is formed, so that fuel can pass from the recess 74 via the bore 64 in the projection 50 to the inlet valve 26. At the metering device 80, an electrical terminal 81 is arranged for connection to an electronic control device, by which the actuator 84 is driven. When connected to the cylinder head 10 Niederdruckmo- module 70, the metering device 80 is arranged so that the longitudinal axis 83 of the piston 82 at least approximately coaxial with the cylinder bore 12 extends.
Das Modulgehäuse 72 weist einen zumindest annähernd radial zur Ausnehmung 74 nach außen ragenden Vorsprung 86 mit einer Bohrung 87 auf. In die Bohrung 87 ist ein Anschlussstutzen 88 eingefügt, beispielsweise eingepresst. Am An- schlussstutzen 88 ist eine hydraulische Leitung anschließbar, die beispielsweise von einer Förderpumpe zum Niederdruckmodul 70 führt. Die Bohrung 87 im Modulgehäuse 72 ist über eine weitere Bohrung 89 mit der Zumesseinrichtung 80 verbunden, wobei die weitere Bohrung 89 in einem den Kolben 82 der The module housing 72 has an at least approximately radially to the recess 74 outwardly projecting projection 86 with a bore 87. In the bore 87, a connecting piece 88 is inserted, for example, pressed. At the beginning The connection piece 88 can be connected to a hydraulic line which, for example, leads from a delivery pump to the low-pressure module 70. The bore 87 in the module housing 72 is connected via a further bore 89 with the metering device 80, wherein the further bore 89 in a piston 82 of the
Zumesseinrichtung 80 umgebenden Ringraum 90 im Modulgehäuse 72 mündet. Der Ringraum 90 und die Bohrung 87 können dabei in Richtung der Längsachse 83 des Kolbens 82 zueinander versetzt angeordnet sein, so dass die weitere Bohrung 89 entsprechend schräg im Modulgehäuse 72 verläuft. Metering 80 surrounding annular space 90 in the module housing 72 opens. The annular space 90 and the bore 87 can be arranged offset to one another in the direction of the longitudinal axis 83 of the piston 82, so that the further bore 89 extends correspondingly obliquely in the module housing 72.
Im Betrieb der Pumpe gelangt Kraftstoff beispielsweise von einer Förderpumpe gefördert aus einem Vorratsbehälter über den Anschlussstutzen 88 in die Bohrung 87 im Modulgehäuse 72 und von dort über die weitere Bohrung 89 in den Ringraum 90. Vom Ringraum 90 gelangt der Kraftstoff über den vom Kolben 82 der Zumesseinrichtung 80 eingestellten Durchflussquerschnitt und durch den Kolben 82 in die Ausnehmung 74 und von dieser über die Bohrung 64 und die Zu- laufbohrungen 60 im Ventilgehäuse 32 zum Einlassventil 26. Durch die koaxiale Anordnung des Kolbens 82 der Zumesseinrichtung 80 zum Einlassventil 26, das wiederum koaxial zur Zylinderbohrung 12 angeordnet ist, wird eine günstige Einströmung des Kraftstoffs erreicht. Beim Saughub des Pumpenkolbens 14 öffnet das Einlassventil 26, so dass Kraftstoff in den Pumpenarbeitsraum 16 einströmt. Die beim Saughub des Pumpenkolbens 14 über das Einlassventil 26 in den Pumpenarbeitsraum 16 einströmende Kraftstoffmenge ist abhängig von dem durch den Kolben 82 der Zumesseinrichtung 80 eingestellten Durchflussquerschnitt. Wenn durch die Pumpe kein Kraftstoff gefördert werden soll, so wird die Zumesseinrichtung 80 geschlossen, so dass diese den Durchflussquerschnitt sperrt. Sollte infolge einer Leckage der Zumesseinrichtung dennoch Kraftstoff zur Pumpe gelangen und durch diese gefördert werden, so kann durch geeignete Maßnahmen in der Kraftstoffeinspritzeinrichtung der zu viel geförderte Kraftstoff abgeleitet werden. Gegebenenfalls kann zwischen der Förderpumpe, durch die Kraftstoff aus dem Vorratsbehälter zum Niederdruckmodul 70 gefördert wird, und dem Niederdruckmodul 70 ein Überströmventil angeordnet sein, durch das von der Förderpumpe zu viel geförderter Kraftstoff, der nicht durch die During operation of the pump fuel passes, for example, from a supply pump from a reservoir via the connecting piece 88 into the bore 87 in the module housing 72 and from there via the further bore 89 in the annular space 90. From the annular space 90 of the fuel passes through the piston 82 of the The coaxial arrangement of the piston 82 of the metering device 80 to the inlet valve 26, which in turn is coaxial is arranged to the cylinder bore 12, a favorable inflow of the fuel is achieved. During the suction stroke of the pump piston 14, the inlet valve 26 opens, so that fuel flows into the pump working chamber 16. The amount of fuel flowing into the pump working chamber 16 via the inlet valve 26 during the suction stroke of the pump piston 14 depends on the flow cross section set by the piston 82 of the metering device 80. If no fuel is to be delivered by the pump, the metering device 80 is closed so that it blocks the flow cross-section. If, due to leakage of the metering device, fuel still reaches the pump and is pumped through it, the excess fuel delivered can be discharged by suitable measures in the fuel injector. Optionally, between the feed pump, is conveyed by the fuel from the reservoir to the low pressure module 70, and the low pressure module 70, a spill valve may be arranged by the pump from the pump too much subsidized fuel, not by the
Zumesseinrichtung 80 der Pumpe zugeführt wird, abgeleitet werden kann. Das Überströmventil ist dabei nicht am Niederdruckmodul 70 angeordnet, sondern beispielsweise an der Förderpumpe. Am Niederdruckmodul 70 ist als einziger hydraulischer Anschluss der Anschlussstutzen 88 angeordnet sowie der elektrische Anschluss 81 für die Metering device 80 is supplied to the pump, can be derived. The overflow valve is not arranged on the low pressure module 70, but for example on the feed pump. At the low pressure module 70, the connecting piece 88 is arranged as the only hydraulic connection and the electrical connection 81 for the
Zumesseinrichtung 80 vorgesehen. Weitere hydraulische Anschlüsse, beispiels- weise für einen Rücklauf, sind nicht vorgesehen. Das Niederdruckmodul 70 kann infolge der kreiszylinderförmigen Ausbildung des Ansatzes 50 des Zylinderkopfs 10 in beliebigen Drehstellungen auf den Zylinderkopf 10 aufgesetzt werden, wobei über die Ausnehmung 74 und den zwischen dieser und dem Ansatz 50 des Zylinderkopfs 10 vorhandenen Ringraum stets eine Verbindung zwischen dem Ablauf der Zumesseinrichtung 80 und dem Einlassventil 26 vorhanden ist. Metering device 80 is provided. Further hydraulic connections, for example for a return, are not provided. The low-pressure module 70 can be placed in any rotational positions on the cylinder head 10 due to the circular cylindrical design of the projection 50 of the cylinder head 10, via the recess 74 and existing between this and the neck 50 of the cylinder head 10 annulus always a connection between the flow of the metering device 80 and the inlet valve 26 is present.
In Figur 3 ist die Pumpe mit dem Niederdruckmodul 170 gemäß einem zweiten Ausführungsbeispiel dargestellt. Der Zylinderkopf 10 der Pumpe ist gleich ausgebildet wie beim ersten Ausführungsbeispiel, jedoch ist das Niederdruckmodul 170 anders ausgebildet und die Zumesseinrichtung 180 ist anders angeordnet. DasFIG. 3 shows the pump with the low-pressure module 170 according to a second exemplary embodiment. The cylinder head 10 of the pump is the same as in the first embodiment, but the low-pressure module 170 is formed differently and the metering device 180 is arranged differently. The
Modulgehäuse 172 gemäß dem zweiten Ausführungsbeispiel ist flacher ausgebildet als beim ersten Ausführungsbeispiel und weist einen Flansch 173 mit einer Öffnung 174 auf, wobei das Modulgehäuse 172 so auf den Zylinderkopf 10 aufgesetzt ist, dass dessen Öffnung 174 den Ansatz 50 des Zylinderkopfs 10 umgibt. Seitlich an den Flansch 173 anschließend weist das Modulgehäuse 172 einenModule housing 172 according to the second embodiment is flatter than in the first embodiment and has a flange 173 with an opening 174, wherein the module housing 172 is mounted on the cylinder head 10 so that its opening 174 surrounds the projection 50 of the cylinder head 10. Laterally to the flange 173 then the module housing 172 has a
Vorsprung 186 auf, an dessen Ende in eine Bohrung 187 der Anschlussstutzen 88 eingesetzt ist. Zwischen dem Anschlussstutzen 88 und dem Flansch 173 ist im Modulgehäuse 172 eine weitere Öffnung 178 vorgesehen, in die die Projection 186, at the end in a bore 187 of the connecting piece 88 is inserted. Between the connecting piece 88 and the flange 173, a further opening 178 is provided in the module housing 172, in which the
Zumesseinrichtung 80 eingesetzt ist. Die Öffnung 178 ist mit ihrer Längsachse zumindest annähernd parallel zur Längsachse der Öffnung 174 ausgerichtet. An die Bohrung 187 schließt sich im Modulgehäuse 172 eine weitere Bohrung 189 an, die in einen den Kolben 82 der Zumesseinrichtung 80 radial umgebenden Ringraum 190 mündet. Zwischen der Zumesseinrichtung 80 und dem Modulgehäuse 172 ist ein Raum 191 gebildet, in den der Ablauf der Zumesseinrichtung 80 mündet und der mit einer in die Öffnung 174 mündenden Bohrung 192 verbunden ist. Zwischen dem Ansatz 50 und der Öffnung 174 im Flansch 173 des Modulgehäuses 172 ist ein Ringraum gebildet. Metering device 80 is used. The opening 178 is aligned with its longitudinal axis at least approximately parallel to the longitudinal axis of the opening 174. The bore 187 is followed in the module housing 172 by a further bore 189, which opens into a piston 82 of the metering device 80 radially surrounding annular space 190. Between the metering device 80 and the module housing 172, a space 191 is formed, into which the outlet of the metering device 80 opens and which is connected to a bore 192 opening into the opening 174. Between the projection 50 and the opening 174 in the flange 173 of the module housing 172, an annular space is formed.
Zwischen dem Flansch 173 des Modulgehäuses 172 und dem flanschartigen Bereich 46 des Zylinderkopfs 10 ist ein Dichtelement 76 angeordnet. Außerdem ist oberhalb der Bohrung 64 im Ansatz 50 des Zylinderkopfs 10 zwischen dem Ansatz 50 und der Öffnung 174 des Flanschs 173 ein Dichtelement 193, beispielsweise in Form eines Dichtrings, angeordnet. Weiterhin ist zwischen der Verschlussschraube 56 und dem Innenmantel des Ansatzes 50 ein Dichtelement 194, beispielsweise in Form eines Dichtrings, angeordnet. Somit ist der Übergang zwischen dem Zylinderkopf 10 und dem Niederdruckmodul sowie das Einlassventil 26 nach außen abgedichtet. Between the flange 173 of the module housing 172 and the flange-like region 46 of the cylinder head 10, a sealing element 76 is arranged. Besides that is Above the bore 64 in the projection 50 of the cylinder head 10 between the projection 50 and the opening 174 of the flange 173, a sealing element 193, for example in the form of a sealing ring arranged. Furthermore, a sealing element 194, for example in the form of a sealing ring, is arranged between the closure screw 56 and the inner jacket of the extension 50. Thus, the transition between the cylinder head 10 and the low pressure module and the inlet valve 26 is sealed to the outside.
Das Niederdruckmodul 170 kann infolge der kreiszylinderförmigen Ausbildung des Ansatzes 50 des Zylinderkopfs 10 in beliebigen Drehstellungen mit dem Zylinderkopf 10 verbunden werden. Über den zwischen dem Ansatz 50 und der Öffnung 174 des Flanschs 173 vorhandenen Ringraum ist unabhängig von der Drehstellung des Niederdruckmoduls 70 stets eine Verbindung zwischen der Bohrung 192 des Modulgehäuses 172 mit der Bohrung 64 des Ansatzes 50 und somit dem Einlassventil 26 vorhanden. The low-pressure module 170 can be connected as a result of the circular cylindrical design of the projection 50 of the cylinder head 10 in any rotational positions with the cylinder head 10. Irrespective of the rotational position of the low-pressure module 70, a connection between the bore 192 of the module housing 172 with the bore 64 of the projection 50 and thus with the inlet valve 26 is always present via the annular space present between the projection 50 and the opening 174 of the flange 173.

Claims

Ansprüche claims
1. Pumpe, insbesondere Kraftstoffhochdruckpumpe, mit einem Gehäuseteil (10), in dem in einer Zylinderbohrung (12) ein Pumpenkolben (14) beweglich angeordnet ist, der in der Zylinderbohrung (12) einen Pumpenarbeitsraum (16) begrenzt, mit einem im Gehäuseteil (10) angeordneten Einlassventil (26), durch das der Pumpenarbeitsraum (16) mit einem Zulauf (27) verbindbar ist, wobei im Zulauf (27) eine Zumesseinrichtung (80) vorgesehen ist, durch die die dem Pumpenarbeitsraum (16) zugeführte Menge an Fördermedium variabel einstellbar ist, wobei der Zulauf (27) zumindest teilweise in einem mit der Pumpe verbundenen Niederdruckmodul (70;170) verläuft und die Zumesseinrichtung (80) am Niederdruckmodul (70) angeordnet ist, dadurch gekennzeichnet, dass das Gehäuseteil (10) einen an die Zylinderbohrung (12) anschließenden hohlzylinderförmigen Ansatz (50) aufweist, in dem das Einlassventil (26) angeordnet ist, dass das Niederdruckmodul (70) auf den hohlzylinderförmigen Ansatz (50) des Gehäuseteils (10) aufgesetzt ist und dass der Zulauf von der Zumesseinrichtung (80) zum Einlassventil (26) durch den hohlzylinderförmigen Ansatz (50) verläuft. 1. pump, in particular high-pressure fuel pump, with a housing part (10) in which in a cylinder bore (12) a pump piston (14) is movably disposed in the cylinder bore (12) defines a pump working space (16), with a in the housing part ( 10) arranged inlet valve (26) through which the pump working chamber (16) with an inlet (27) is connectable, wherein in the inlet (27) a metering device (80) is provided, through which the pump working space (16) supplied amount of fluid is variably adjustable, wherein the inlet (27) at least partially in a connected to the pump low-pressure module (70; 170) and the metering device (80) on the low-pressure module (70) is arranged, characterized in that the housing part (10) to an the cylinder bore (12) subsequent hollow cylindrical projection (50), in which the inlet valve (26) is arranged, that the low pressure module (70) on the hollow cylindrical projection (50) of the housing eteils (10) is fitted and that the inlet from the metering device (80) to the inlet valve (26) through the hollow cylindrical projection (50) extends.
2. Pumpe nach Anspruch 1, dadurch gekennzeichnet, dass das Niederdruckmodul (70) in beliebigen Drehstellungen auf dem hohlzylinderförmigen Ansatz (50) des Gehäuseteils (10) aufgesetzt werden kann. 2. Pump according to claim 1, characterized in that the low pressure module (70) in any rotational positions on the hollow cylindrical projection (50) of the housing part (10) can be placed.
3. Pumpe nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die 3. Pump according to claim 1 or 2, characterized in that the
Zumesseinrichtung (80) einen verschiebbar geführten Kolben (82) aufweist, durch den der Durchflussquerschnitt im Zulauf (27) variabel eingestellt werden kann, und dass die Zumesseinrichtung (80) so angeordnet ist, dass die Längsachse (83) von deren Kolben (82) bei auf den Ansatz (50) aufgesetztem Niederdruckmodul (70) zumindest annähernd parallel zur Längsachse (13) der Zylinderbohrung (12) des Gehäuseteils (10) verläuft. Pumpe nach Anspruch 3, dadurch gekennzeichnet, dass die Metering device (80) has a displaceably guided piston (82) through which the flow cross-section in the inlet (27) can be variably adjusted, and that the metering device (80) is arranged so that the longitudinal axis (83) of the piston (82) at at least approximately parallel to the longitudinal axis (13) of the cylinder bore (12) of the housing part (10) extends at low pressure module (70) placed on the attachment (50). Pump according to claim 3, characterized in that the
Zumesseinrichtung (80) so angeordnet ist, dass die Längsachse (83) von deren Kolben (82) bei auf den Ansatz (50) aufgesetztem Niederdruckmodul (70) zumindest annähernd koaxial zur Längsachse (13) der Zylinderbohrung (12) des Gehäuseteils (10) verläuft. Metering device (80) is arranged so that the longitudinal axis (83) of the piston (82) with at least slightly coaxial with the longitudinal axis (13) of the cylinder bore (12) of the housing part (10) when the low-pressure module (70) is placed on the projection (50). runs.
Pumpe nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass das Niederdruckmodul (70) ein aus Leichtmetall oder Kunststoff hergestelltes Modulgehäuse (72) aufweist. Pump according to one of the preceding claims, characterized in that the low-pressure module (70) has a made of light metal or plastic module housing (72).
Pumpe nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass am Niederdruckmodul (70) ein einziger externer hydraulischer Anschluss (88) vorgesehen ist, über den der Zulauf (27) mit dem Niederdruckmodul (70) verbunden ist. Pump according to one of the preceding claims, characterized in that the low-pressure module (70), a single external hydraulic port (88) is provided, via which the inlet (27) is connected to the low-pressure module (70).
Pumpe nach Anspruch 6, dadurch gekennzeichnet, dass der externe hydraulische Anschluss (88) so angeordnet ist, dass dessen Längsachse zumindest annähernd senkrecht zur Längsachse (83) des Kolbens (82) der Pump according to claim 6, characterized in that the external hydraulic port (88) is arranged so that its longitudinal axis at least approximately perpendicular to the longitudinal axis (83) of the piston (82) of the
Zumesseinrichtung (80) verläuft. Metering device (80) extends.
Pumpe nach Anspruch 7, dadurch gekennzeichnet, dass der Zulauf vom Kolben (82) der Zumesseinrichtung (80) zum Einlassventil (26) zumindest annähernd in Richtung der Längsachse (83) des Kolbens (82) verläuft. Pump according to claim 7, characterized in that the inlet from the piston (82) of the metering device (80) to the inlet valve (26) extends at least approximately in the direction of the longitudinal axis (83) of the piston (82).
Pumpe nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass das Niederdruckmodul (70) eine Ausnehmung (74) aufweist, in die der Ansatz (50) des Gehäuseteils (10) hineinragt und dass der Zulauf vom Niederdruckmodul (70) durch die Ausnehmung (74) des Niederdruckmoduls (70) und zwischen der Ausnehmung (74) und dem Ansatz (50) des Gehäuseteils (10) verläuft. Pump according to one of the preceding claims, characterized in that the low-pressure module (70) has a recess (74) into which projects the projection (50) of the housing part (10) and that the inlet from the low-pressure module (70) through the recess (74 ) of the low-pressure module (70) and between the recess (74) and the projection (50) of the housing part (10).
EP14742485.7A 2013-08-30 2014-07-17 Pump, in particular a high-pressure fuel pump Not-in-force EP3039282B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201310217357 DE102013217357A1 (en) 2013-08-30 2013-08-30 Pump, in particular a high-pressure fuel pump
PCT/EP2014/065390 WO2015028196A1 (en) 2013-08-30 2014-07-17 Pump, in particular a high-pressure fuel pump

Publications (2)

Publication Number Publication Date
EP3039282A1 true EP3039282A1 (en) 2016-07-06
EP3039282B1 EP3039282B1 (en) 2019-02-27

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ID=51224919

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14742485.7A Not-in-force EP3039282B1 (en) 2013-08-30 2014-07-17 Pump, in particular a high-pressure fuel pump

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EP (1) EP3039282B1 (en)
JP (1) JP6175567B2 (en)
CN (1) CN105492756B (en)
DE (1) DE102013217357A1 (en)
WO (1) WO2015028196A1 (en)

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Publication number Priority date Publication date Assignee Title
US20180010600A1 (en) 2016-07-08 2018-01-11 Delphi Technologies, Inc. High-pressure fuel pump

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JP2003120468A (en) * 2001-10-15 2003-04-23 Bosch Automotive Systems Corp Liquid fuel flow rate regulating valve, and fuel injection system of internal combustion engine having the liquid fuel flow rate regulating valve
JP4221760B2 (en) * 2005-01-17 2009-02-12 株式会社デンソー High pressure fuel pump
DE102006061558A1 (en) * 2006-12-27 2008-07-03 Robert Bosch Gmbh Fuel delivery device for internal combustion engine of motor vehicle, has adjustable throttle device arranged upstream to suction valve, where outlet of throttle device is arranged directly proximate to suction valve
DE102007038984A1 (en) * 2007-08-17 2009-02-19 Robert Bosch Gmbh Fuel pump for a fuel system of an internal combustion engine
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JP2010112304A (en) * 2008-11-07 2010-05-20 Bosch Corp Fuel supply pump
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Also Published As

Publication number Publication date
DE102013217357A1 (en) 2015-03-05
JP6175567B2 (en) 2017-08-02
CN105492756B (en) 2019-03-08
EP3039282B1 (en) 2019-02-27
JP2016532815A (en) 2016-10-20
CN105492756A (en) 2016-04-13
WO2015028196A1 (en) 2015-03-05

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