WO2010028887A1 - Device for the fuel supply of an internal combustion engine - Google Patents

Device for the fuel supply of an internal combustion engine Download PDF

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Publication number
WO2010028887A1
WO2010028887A1 PCT/EP2009/059029 EP2009059029W WO2010028887A1 WO 2010028887 A1 WO2010028887 A1 WO 2010028887A1 EP 2009059029 W EP2009059029 W EP 2009059029W WO 2010028887 A1 WO2010028887 A1 WO 2010028887A1
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WO
WIPO (PCT)
Prior art keywords
pressure
low
combustion engine
internal combustion
pressure unit
Prior art date
Application number
PCT/EP2009/059029
Other languages
German (de)
French (fr)
Inventor
Friedrich Boecking
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
Priority to EP09780603A priority Critical patent/EP2337945A1/en
Publication of WO2010028887A1 publication Critical patent/WO2010028887A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02—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
    • F02M59/04—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 characterised by special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps
    • F02M59/06—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 characterised by special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps with cylinders arranged radially to driving shaft, e.g. in V or star arrangement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F02M37/0052—Details on the fuel return circuit; Arrangement of pressure regulators
    • 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
    • F02M39/00—Arrangements of fuel-injection apparatus with respect to engines; Pump drives adapted to such arrangements
    • F02M39/005—Arrangements of fuel feed-pumps with respect to fuel injection apparatus
    • 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
    • F02M59/10—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 characterised by the piston-drive
    • F02M59/102—Mechanical drive, e.g. tappets or cams
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • F02M63/0265—Pumps feeding common rails
    • 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
    • F04B23/00—Pumping installations or systems
    • F04B23/04—Combinations of two or more pumps
    • F04B23/08—Combinations of two or more pumps the pumps being of different types
    • F04B23/10—Combinations of two or more pumps the pumps being of different types at least one pump being of the reciprocating positive-displacement type
    • F04B23/103—Combinations of two or more pumps the pumps being of different types at least one pump being of the reciprocating positive-displacement type being a radial piston pump
    • 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
    • F04B23/00—Pumping installations or systems
    • F04B23/04—Combinations of two or more pumps
    • F04B23/08—Combinations of two or more pumps the pumps being of different types
    • F04B23/12—Combinations of two or more pumps the pumps being of different types at least one pump being of the rotary-piston positive-displacement 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/27—Fuel-injection apparatus with filters

Definitions

  • the invention relates to a device for supplying fuel to an internal combustion engine, according to the preamble of claim 1.
  • Such a device for supplying fuel to an internal combustion engine is known from DE 102 47 142 A1. It is arranged between a fuel supply and a high-pressure accumulator, also called a common rail, to which the individual injection nozzles of the internal combustion engine are connected.
  • a high-pressure accumulator also called a common rail
  • auxiliaries available to be connected to each other and to the internal combustion engine and the fuel tank.
  • the installation effort is accordingly high.
  • the space in the engine compartment of a motor vehicle is very cramped, which makes it difficult to place the necessary lines and auxiliary equipment satisfactorily and to assemble.
  • the inventive device for supplying fuel to an internal combustion engine with the features of claim 1 has the advantage that it forms a module-like mounting unit, which can be mounted in a space-saving and functional form, without the need for separate installation of auxiliary equipment or the installation of low-pressure side supply lines.
  • the low-pressure unit can be due to their cuboid shape and the low pressure load made of an easily editable material easily edit on all sides and accordingly very easy to provide with all necessary holes and connections.
  • the embodiment according to claim 3 has the advantage that greatly simplifies the assembly of the quite complicated venting and pressure relief valve. It is In particular, it is only necessary to insert the corresponding modules into fitting bores of a profile adapted thereto and subsequently to close the bores to the outside, for example by means of locking screws or plugs inserted therein.
  • the embodiment according to claim 4 makes it possible in a simplified manner to integrate or connect a fuel filter to the device.
  • the embodiment according to claim 5 simplifies the possibility of connecting a metering valve.
  • Metering valves have the purpose of adapting the fuel volume fed into the high-pressure accumulator by the high-pressure radial piston pump to the actual requirements. This is largely determined by the location of the operating area in which the internal combustion engine is located. For example, at idle, significantly less fuel is needed than in the full load range. Accordingly, the volume of fuel supplied to the high-pressure radial-piston pump, for example, when idling, is correspondingly reduced by the metering valve and prevents large excesses of fuel from being compressed to a high pressure of possibly more than 2,000 bar and then released into the fuel tank unused.
  • Fig. 1 shows a device for supplying fuel to an internal combustion engine in longitudinal section.
  • Fig. 2 is a low pressure unit of FIG. 1 in a cross-sectional view.
  • Fig. 3 is a low pressure unit of FIG. 2 in a cross-sectional view, which is only connected by a line to the fuel tank.
  • FIG. 1 shows a device for fuel supply of an internal combustion engine in longitudinal section. It comprises a high-pressure radial piston pump 1, which is regularly mounted so that the projecting end protrudes into the housing of the internal combustion engine and can be set into a rotational movement by a rotating part of the internal combustion engine.
  • the internal combustion engine and the housing 18 of the high-pressure radial piston pump is releasably screwed by a flange connection.
  • the housing 18 of the high-pressure radial piston pump comprises a drive shaft 2 accommodated therein and rotating about an axis with a cam or eccentric 3 protruding in the radial direction, with which at least one piston 5 accommodated in a cylinder 4 engages through the cam or eccentric 3 can be successively moved back and forth in the radial direction.
  • the drive shaft 2 is rotatably supported by plain bearings in the housing 18.
  • the cylinder 4 forms part of a bolted to the housing 18 cylinder head 19.
  • a pump chamber 20 is included, the one Part of the cylinder 4 forms and is bounded by the end face of the reciprocable piston 5 back and forth.
  • a low pressure unit 6 and a gear pump 7 is attached thereto.
  • the low-pressure unit 6 can be edited on all sides due to its cuboid shape and thus particularly easy to provide with all necessary holes and connections. It preferably consists of a readily moldable and optionally machinable material, such as steel or aluminum. Externally routed cables can thus be largely avoided and replaced by internal and possibly intersecting holes. Outer mouths of holes that are not needed, can be very easily sealed by pressed into the mouths sealing plug, for example, by oversized balls 26 made of hardened steel, which are pressed into the mouths of the holes. The mouths can of course also be provided with an internal thread into which a sealing screw 27 is screwed sealingly.
  • the device can be mounted as a self-contained module very easy and space-saving in the space of the housing of the high-pressure radial piston pump 1 and the Zahrandpumpe 7 and put into operation. In extreme cases, it is only necessary to connect the device to the fuel tank through a single low pressure line and to the high pressure header through a single high pressure line.
  • the low-pressure unit 6 contains a venting valve 12 and a pressure relief valve 13, which ensures that the toothed rim pump 7 is not overloaded and that the fuel supplied to the high-pressure radial piston pump 1 always has a certain pressure of max. 6 bar.
  • the fuel volume entering from the gear pump 7 via the return line 9 into the low pressure unit 6 is adjusted to the desired pressure in the pressure relief valve 13, subsequently degassed by the venting valve 12 and fed to an external fuel filter.
  • the low-pressure unit 6 contains for this purpose a flow connection 14 and a return connection 15 for the connection of the external and not shown fuel filter. This ensures that the fuel supplied to the high-pressure radial piston pump 1 is completely free from suspended particles and gases, which can lead to functional impairments of the injection nozzles or other parts.
  • the use of an external fuel filter has the advantage that a tool-free replacement of the fuel filter within the maintenance intervals of a motor vehicle possible and permanently reliable operation of the internal combustion engine is guaranteed.
  • the usage an internal fuel filter in the low-pressure unit 6 is thereby not excluded.
  • the pressure relief valve 13 and the vent valve 12 are connected through a bore 23 to the intake pipe 10 of the fuel tank. Unnecessary amounts of fuel and escaping gases are thereby discharged into the fuel tank.
  • the pressure relief valve 13 and the vent valve 12 are both contained in functional modules that are sealingly inserted into holes of the low pressure unit 6, in particular pressed. Both modules are prefabricated. Their installation and use therefore require no special expertise or adjustment.
  • the return port 15 of the fuel filter is connected to the port 17 of the metering valve, not shown. This regulates the high-pressure radial piston pump supplied amount of fuel to the level required by the internal combustion engine. Excessive amounts are passed back via the metering valve and the zero feed throttle 16 contained in the low-pressure unit 6 back into the fuel tank.
  • the required quantities of fuel are the intake port 18 of the high-pressure radial piston pump 1 and fed via the intake valve 21 ( Figure 1) into the pump chamber 20, compressed therein and ejected under high pressure via the high pressure valve 22 and transferred to the high pressure storage.
  • the return 25 of the high-pressure radial piston pump 1 is connected to the fuel tank.
  • Fig. 3 shows a low pressure unit 6 similar to the design of FIG. 2 in a cross-sectional view, which is connected only by a line to the fuel tank and thus is particularly easy to assemble.

Abstract

The invention relates to a device for the fuel supply of an internal combustion engine, comprising a high-pressure radial piston pump (1) having a drive shaft (2) which is accommodated therein and rotates about an axis with a cam or eccentric element (3) protruding radially, with which at least one piston (5) accommodated in a cylinder (4) is engaged, said pistons being displaceable by the cam or eccentric element (3) in the radial direction. A low-pressure unit (6) with a gear pump (7) attached thereto is fixed to the side of the high-pressure radial piston pump (1), which faces away from the internal combustion engine, wherein the low-pressure unit (6) comprises the connecting lines on the low-pressure side, the connections of the high-pressure radial piston pump (1), the connections of the feed line (7) and the return line (9) of the gear pump (7) as well as the feed line (10) and the return line (11) of the fuel supply.

Description

Titel: Vorrichtung zur Kraftstoffversorgung einer Verbrennungskraftmaschine Title: Device for supplying fuel to an internal combustion engine
Beschreibungdescription
Technisches GebietTechnical area
Die Erfindung geht aus von einer Vorrichtung zur Kraftstoffversorgung einer Verbrennungskraftmaschine, nach dem Oberbegriff von Anspruch 1.The invention relates to a device for supplying fuel to an internal combustion engine, according to the preamble of claim 1.
Stand der TechnikState of the art
Eine solche Vorrichtung zur Kraftstoffversorgung einer Verbrennungskraftmaschine ist aus der DE 102 47 142 A1 bekannt. Sie ist zwischen einer Kraftstoffzuführung und einem Hochdruckspeicher, auch Common - Rail genannt, angeordnet, an den die einzelnen Einspritzdüsen der Verbrennungskraftmaschine angeschlossen sind. Für einen ordnungsgemäßen und sparsamen Betrieb der Verbrennungskraftmaschine ist es erforderlich, zahlreiche Anschlüsse und Hilfseinrichtungen zur Verfügung zu haben, die miteinander und mit der Verbrennungskraftmaschine und dem Kraftstofftank verbunden werden müssen. Der Montageaufwand ist dementsprechend hoch. Häufig sind die Platzverhältnisse im Motorraum eines Kraftfahrzeuges sehr beengt, was es schwierig macht, die nötigen Leitungen und Hilfseinrichtungen zufriedenstellend zu platzieren und zu montieren.Such a device for supplying fuel to an internal combustion engine is known from DE 102 47 142 A1. It is arranged between a fuel supply and a high-pressure accumulator, also called a common rail, to which the individual injection nozzles of the internal combustion engine are connected. For a proper and economical operation of the internal combustion engine, it is necessary to numerous ports and Having auxiliaries available to be connected to each other and to the internal combustion engine and the fuel tank. The installation effort is accordingly high. Often, the space in the engine compartment of a motor vehicle is very cramped, which makes it difficult to place the necessary lines and auxiliary equipment satisfactorily and to assemble.
Offenbarung der Erfindung Vorteile der ErfindungDisclosure of the Invention Advantages of the Invention
Die erfindungsgemäße Vorrichtung zur Kraftstoffversorgung einer Verbrennungskraftmaschine mit den Merkmalen gemäß Anspruch 1 hat den Vorteil, dass sie eine modulartige Einbaueinheit bildet, die platzsparend und in funktionsfähiger Form montierbar ist, ohne dass es der gesonderten Montage von Hilfseinrichtungen oder der Verlegung von niederdruckseitigen Versorgungsleitungen bedarf. Die Niederdruckeinheit lässt sich auf Grund ihrer quaderförmigen Gestalt und der geringen Druckbelastung aus einem leicht bearbeitbaren Werkstoff herstellen auf allen Seiten leicht bearbeiten und demgemäss sehr einfach mit allen notwendigen Bohrungen und Anschlüssen versehen.The inventive device for supplying fuel to an internal combustion engine with the features of claim 1 has the advantage that it forms a module-like mounting unit, which can be mounted in a space-saving and functional form, without the need for separate installation of auxiliary equipment or the installation of low-pressure side supply lines. The low-pressure unit can be due to their cuboid shape and the low pressure load made of an easily editable material easily edit on all sides and accordingly very easy to provide with all necessary holes and connections.
In den abhängigen Ansprüchen sind vorteilhafte Ausgestaltungen und Weiterbildungen der erfindungsgemäßen Hochdruck-Radialkolbenpumpe angegeben. Durch die Ausbildung gemäß Anspruch 2 wird der Vorteil erhalten, dass die für die Entlüftung und/oder Überdruckableitung der Zahnradpumpe keine separaten Leitungen und/oder Anschlüsse benötigt werden.In the dependent claims advantageous refinements and developments of the high-pressure radial piston pump according to the invention are given. Due to the design according to claim 2, the advantage is obtained that no separate lines and / or connections are required for the venting and / or overpressure derivation of the gear pump.
Die Ausgestaltung nach Anspruch 3 hat den Vorteil, dass sich die Montage des recht komplizierten Entlüftungs- und Überdruckventils stark vereinfacht. Es ist insbesondere nur erforderlich, die entsprechenden Module in Passbohrungen eines daran angepassten Profils einzufügen und die Bohrungen nachfolgend nach außen zu verschließen, beispielsweise durch darin eingesetzte Verschlussschrauben oder -stopfen.The embodiment according to claim 3 has the advantage that greatly simplifies the assembly of the quite complicated venting and pressure relief valve. It is In particular, it is only necessary to insert the corresponding modules into fitting bores of a profile adapted thereto and subsequently to close the bores to the outside, for example by means of locking screws or plugs inserted therein.
Durch die Ausbildung gemäß Anspruch 4 ist es vereinfacht möglich, ein Kraftstofffilter in die Vorrichtung zu integrieren oder daran anzuschließen.The embodiment according to claim 4 makes it possible in a simplified manner to integrate or connect a fuel filter to the device.
Durch die Ausbildung gemäß Anspruch 5 wird die Möglichkeit vereinfacht, ein Zumessventil mit anzuschließen. Zumessventile haben den Zweck, das von der Hochdruck-Radialkolbenpumpe in den Hochdruckspeicher eingespeiste Kraftstoffvolumen an den tatsächlichen Bedarf anzupassen. Dieser wird maßgeblich durch die Lage des Betriebsbereiches bestimmt, in dem sich die Verbrennungskraftmaschine befindet. Beispielsweise im Leerlauf wird erheblich weni- ger Kraftstoff benötigt als im Volllastbereich. Demgemäss wird das der Hochdruck-Radialkolbenpumpe zum Beispiel im Leerlauf zugeführte Kraftstoffvolumen von dem Zumessventil entsprechend reduziert und vermieden, dass große Überschüsse an Kraftstoff auf einen hohen Druck von gegebenenfalls mehr als 2.000 bar verdichtet und anschließend ungenutzt in den Kraftstofftank ent- spannt werden.The embodiment according to claim 5 simplifies the possibility of connecting a metering valve. Metering valves have the purpose of adapting the fuel volume fed into the high-pressure accumulator by the high-pressure radial piston pump to the actual requirements. This is largely determined by the location of the operating area in which the internal combustion engine is located. For example, at idle, significantly less fuel is needed than in the full load range. Accordingly, the volume of fuel supplied to the high-pressure radial-piston pump, for example, when idling, is correspondingly reduced by the metering valve and prevents large excesses of fuel from being compressed to a high pressure of possibly more than 2,000 bar and then released into the fuel tank unused.
Zeichnungdrawing
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt. Sie wird nachfolgend näher erläutert. Es zeigen:An embodiment of the invention is shown in the drawing. It will be explained in more detail below. Show it:
Fig.1 eine Vorrichtung zur Kraftstoffversorgung einer Verbrennungskraftmaschine in längsgeschnittener Darstellung. Fig. 2 eine Niederdruckeinheit gemäß Fig. 1 in quergeschnittener Darstellung. Fig. 3 eine Niederdruckeinheit gemäß Fig. 2 in quergeschnittener Darstellung, die nur noch durch eine Leitung mit dem Kraftstofftank verbunden ist.1 shows a device for supplying fuel to an internal combustion engine in longitudinal section. Fig. 2 is a low pressure unit of FIG. 1 in a cross-sectional view. Fig. 3 is a low pressure unit of FIG. 2 in a cross-sectional view, which is only connected by a line to the fuel tank.
Beschreibung der AusführungsbeispieleDescription of the embodiments
Übereinstimmende Bezugszeichen bezeichnen in allen Zeichnungen übereinstimmende Gegenstände.Corresponding reference characters indicate corresponding objects throughout the drawings.
Fig.1 zeigt eine Vorrichtung zur Kraftstoffversorgung einer Verbrennungskraftmaschine in längsgeschnittener Darstellung. Sie umfasst eine Hochdruck- Radialkolbenpumpe 1 , die regelmäßig so montiert wird, dass das vorstehende Ende in das Gehäuse der Verbrennungskraftmaschine hineinragt und von einem rotierenden Teil der Verbrennungskraftmschine in eine Rotationsbe- wegung versetzbar ist. Im allgemeinen ist die Verbrennungskraftmaschine und das Gehäuse 18 der Hochdruck-Radialkolbenpumpe durch eine Flanschverbindung lösbar verschraubt.1 shows a device for fuel supply of an internal combustion engine in longitudinal section. It comprises a high-pressure radial piston pump 1, which is regularly mounted so that the projecting end protrudes into the housing of the internal combustion engine and can be set into a rotational movement by a rotating part of the internal combustion engine. In general, the internal combustion engine and the housing 18 of the high-pressure radial piston pump is releasably screwed by a flange connection.
Das Gehäuse 18 der Hochdruck-Radialkolbenpumpe umfasst eine darin aufge- nommene und um eine Achse rotierende Antriebswelle 2 mit einem in radialer Richtung vorstehenden Nocken oder Exzenter 3, mit dem zumindest ein in einem Zylinder 4 aufgenommener Kolben 5 in Eingriff steht, der durch den Nocken oder Exzenter 3 aufeinanderfolgend in radialer Richtung hin- und herverschiebbar ist. Die Antriebswelle 2 ist durch Gleitlager in dem Gehäuse 18 rotierbar gelagert.The housing 18 of the high-pressure radial piston pump comprises a drive shaft 2 accommodated therein and rotating about an axis with a cam or eccentric 3 protruding in the radial direction, with which at least one piston 5 accommodated in a cylinder 4 engages through the cam or eccentric 3 can be successively moved back and forth in the radial direction. The drive shaft 2 is rotatably supported by plain bearings in the housing 18.
Der Zylinder 4 bildet einen Bestandteil eines mit dem Gehäuse 18 verschraubten Zylinderkopfes 19. In diesem ist ein Pumpenraum 20 enthalten, der einen Bestandteil des Zylinders 4 bildet und von der Stirnseite des darin hin- und her verschiebbaren Kolbens 5 begrenzt ist.The cylinder 4 forms part of a bolted to the housing 18 cylinder head 19. In this, a pump chamber 20 is included, the one Part of the cylinder 4 forms and is bounded by the end face of the reciprocable piston 5 back and forth.
In den Pumpenraum 20 mündet die Sauleitung 24 der Hochdruck-Radialkol- benpumpe 1 , die durch ein Saugventil 21 gegen eine Rückströmung des Kraftstoffes gesichert ist, sowie eine Hochdruckleitung 22, die mit dem Hochdruckspeicher oder Common - Rail verbunden und durch ein Hochdruckventil 22 nur in Richtung des Hochdruckspeichers durchströmbar ist.In the pump chamber 20, the suction line 24 of the high-pressure Radialkol- pumps 1, which is secured by a suction valve 21 against backflow of the fuel, and a high-pressure line 22, which connected to the high pressure accumulator or common rail and through a high pressure valve 22 opens only in Direction of the high-pressure accumulator can be flowed through.
An der von der Verbrennungskraftmaschine 1 abgewandten Seite der Hochdruck-Radialkolbenpumpe 1 ist eine Niederdruckeinheit 6 und daran eine Zahnradpumpe 7 befestigt.On the side facing away from the internal combustion engine 1 side of the high-pressure radial piston pump 1, a low pressure unit 6 and a gear pump 7 is attached thereto.
Fig. 2 zeigt den inneren Aufbau der Niederdruckeinheit 6. Diese enthält die niederdruckseitigen Anschlüsse 24, 25 der Hochdruck-Radialkolbenpumpe 1 umfasst sowie des Vorlaufs 8 und Rücklaufs 9 der Zahnradpumpe 7 und des Vorlaufs 10 und des Rücklaufs 11 der Kraftstoffversorgung. Ein dem Rücklauf 11 vorgeschaltetes Kraftstoffüberlaufventil 28 regelt den Vordruck der Hochdruck-Radialkolbenpumpe 1.This contains the low-pressure side ports 24, 25 of the high-pressure radial piston pump 1 includes and the flow 8 and return 9 of the gear pump 7 and the flow 10 and the return 11 of the fuel supply. A return flow 11 upstream fuel spill valve 28 regulates the form of the high-pressure radial piston pump first
Die Niederdruckeinheit 6 lässt sich auf Grund ihrer quaderförmigen Gestalt auf allen Seiten bearbeiten und dadurch besonders leicht mit allen notwendigen Bohrungen und Anschlüssen versehen. Sie besteht bevorzugt aus einem einfach formbaren und gegebenenfalls spanabhebend bearbeitbaren Werk- stoff, beispielsweise aus Stahl oder Alumium. Extern verlegte Leitungen können dadurch weitgeghend vermieden und durch interne und gegebenenfalls einander durchschneidende Bohrungen ersetzt sein. Außenseitige Mündungen von Bohrungen, die nicht benötigt werden, lassen sich dabei sehr einfach durch in die Mündungen eingepresste Dichtstopfen dauerhaft verschließen, beispielsweise durch mit Übermaß erzeugte Kugeln 26 aus gehärtetem Stahl, die in die Mündungen der Bohrungen eingepresst sind. Die Mündungen können natürlich auch mit einem Innengewinde versehen sein, in das eine Dichtschraube 27 dichtend eingeschraubt ist.The low-pressure unit 6 can be edited on all sides due to its cuboid shape and thus particularly easy to provide with all necessary holes and connections. It preferably consists of a readily moldable and optionally machinable material, such as steel or aluminum. Externally routed cables can thus be largely avoided and replaced by internal and possibly intersecting holes. Outer mouths of holes that are not needed, can be very easily sealed by pressed into the mouths sealing plug, for example, by oversized balls 26 made of hardened steel, which are pressed into the mouths of the holes. The mouths can of course also be provided with an internal thread into which a sealing screw 27 is screwed sealingly.
Durch ihre kompakte Bauweise kann die Vorrichtung als in sich geschlossener Modul sehr leicht und platzsparend in den Zwischenraum des Gehäuses der Hochdruck-Radialkolbenpumpe 1 und der Zahrandpumpe 7 montiert und in Betrieb genommen werden. Im Extremfall ist es nur noch erforderlich, die Vor- richtung durch eine einzige Niederdruckleitung mit dem Kraftstofftrank und durch eine einzige Hochdruckleitung mit dem Hochdrucksammler zu verbinden. Die Niederdruckeinheit 6 enthält ein Entlüftungsventil 12 sowie ein Überdruckventil 13, durch das sichergestellt ist, dass die Zahnrandpumpe 7 nicht überlastet wird und dass der der Hochdruck-Radialkolbenpumpe 1 zugeführte Kraft- stoff immer einen bestimmten Duck von max. 6 bar hat.Due to their compact design, the device can be mounted as a self-contained module very easy and space-saving in the space of the housing of the high-pressure radial piston pump 1 and the Zahrandpumpe 7 and put into operation. In extreme cases, it is only necessary to connect the device to the fuel tank through a single low pressure line and to the high pressure header through a single high pressure line. The low-pressure unit 6 contains a venting valve 12 and a pressure relief valve 13, which ensures that the toothed rim pump 7 is not overloaded and that the fuel supplied to the high-pressure radial piston pump 1 always has a certain pressure of max. 6 bar.
Das aus der Zahnradpumpe 7 über den Rücklauf 9 in die Niederdruckeinheit 6 eintretende Kraftstoffvolumen wird in dem Überdruckventil 13 auf den erwünschten Druck eingestellt, nachfolgend durch das Entlüftungsventil 12 entgast und einem externen Kraftstofffilter zugeführt. Die Niederdruckeinheit 6 enthält dazu einen Vorlaufanschluss 14 und einen Rücklaufanschluss 15 für den Anschluss des externen und nicht dargestellten Kraftstofffilters. Hierdurch wird sichergestellt, dass der der Hochdruck-Radialkolbenpumpe 1 zugeführte Kraftstoff völlig frei von Schwebstoffen und Gasen ist, die dazu führen können, dass sich Funktionsbeeinträchtigungen der Einspritzdüsen oder anderer Teile ergeben. Die Verwendung eines externen Kraftstofffilters hat dabei den Vorteil, dass ein werkzeugloser Austausch des Kraftstofffilters im Rahmen der Wartungsintervalle eines Kraftfahrzeuges möglich und dauerhaft eine zuverlässige Funktion der Verbrennungskraftmaschine gewährleistet ist. Die Verwendung eines internen Kraftstofffilters in der Niederdruckeinheit 6 ist dadurch nicht ausgeschlossen. Das Überdruckventil 13 und das Entlüftungsventil 12 sind durch eine Bohrung 23 mit der Ansaugleitung 10 des Kraftstofftanks verbunden. Nicht benötigte Kraftstoffmengen und entweichende Gase werden dadurch in den Kraftstofftank abgeleitet.The fuel volume entering from the gear pump 7 via the return line 9 into the low pressure unit 6 is adjusted to the desired pressure in the pressure relief valve 13, subsequently degassed by the venting valve 12 and fed to an external fuel filter. The low-pressure unit 6 contains for this purpose a flow connection 14 and a return connection 15 for the connection of the external and not shown fuel filter. This ensures that the fuel supplied to the high-pressure radial piston pump 1 is completely free from suspended particles and gases, which can lead to functional impairments of the injection nozzles or other parts. The use of an external fuel filter has the advantage that a tool-free replacement of the fuel filter within the maintenance intervals of a motor vehicle possible and permanently reliable operation of the internal combustion engine is guaranteed. The usage an internal fuel filter in the low-pressure unit 6 is thereby not excluded. The pressure relief valve 13 and the vent valve 12 are connected through a bore 23 to the intake pipe 10 of the fuel tank. Unnecessary amounts of fuel and escaping gases are thereby discharged into the fuel tank.
Das Überdruckventil 13 und das Entlüftungsventil 12 sind beide in funktionsfähigen Modulen enthalten, die in Bohrungen der Niederdruckeinheit 6 dichtend eingefügt, insbesondere eingepresst sind. Beide Module sind vorgefertigt. Ihr Einbau und Ihre Verwendung erfordern daher keine spezielle Sachkenntnis oder Justierung.The pressure relief valve 13 and the vent valve 12 are both contained in functional modules that are sealingly inserted into holes of the low pressure unit 6, in particular pressed. Both modules are prefabricated. Their installation and use therefore require no special expertise or adjustment.
Der Rücklaufanschluss 15 des Kraftstofffilters ist mit dem Anschluss 17 des nicht dargestellten Zumessventils verbunden. Dieses regelt die der Hochdruck- Radialkolbenpumpe zugeführte Kraftstoffmenge auf das von der Verbrennungskraftmaschine jeweils benötigte Niveau ein. Überschüssige Mengen werden über das Zumessventil und die in der Niederdruckeinheit 6 enthaltene Nullförderdrossel 16 zurück in den Kraftstofftank geleitet.The return port 15 of the fuel filter is connected to the port 17 of the metering valve, not shown. This regulates the high-pressure radial piston pump supplied amount of fuel to the level required by the internal combustion engine. Excessive amounts are passed back via the metering valve and the zero feed throttle 16 contained in the low-pressure unit 6 back into the fuel tank.
Die benötigten Kraftstoffmengen werden der Ansaugöffnung 18 der Hochdruck- Radialkolbenpumpe 1 zugeführt und über das Ansaugventil 21 (Fig.1 ) in den Pumpenraum 20 eingespeist, darin verdichtet und unter hohem Druck über das Hochdruckventil 22 ausgestoßen und in den Hochduckspeicher überführt. Der Rücklauf 25 der Hochdruck-Radialkolbenpumpe 1 ist mit dem Kraftstofftank verbunden.The required quantities of fuel are the intake port 18 of the high-pressure radial piston pump 1 and fed via the intake valve 21 (Figure 1) into the pump chamber 20, compressed therein and ejected under high pressure via the high pressure valve 22 and transferred to the high pressure storage. The return 25 of the high-pressure radial piston pump 1 is connected to the fuel tank.
Fig. 3 zeigt eine Niederdruckeinheit 6 ähnlich der Bauform nach Fig. 2 in quergeschnittener Darstellung, die nur noch durch eine Leitung mit dem Kraftstofftank verbunden und dadurch besonders einfach zu montieren ist. Fig. 3 shows a low pressure unit 6 similar to the design of FIG. 2 in a cross-sectional view, which is connected only by a line to the fuel tank and thus is particularly easy to assemble.

Claims

Patentansprüche claims
1 . Vorrichtung zur Kraftstoffversorgung einer Verbrennungskraftmaschine, umfassend eine Hochdruck-Radialkolbenpumpe (1 ) mit einer darin aufgenommenen und um eine Achse rotierenden Antriebswelle (2) mit einem in radialer Richtung vorstehenden Nocken oder Exzenter (3), mit dem zumindest ein in einem Zylinder (4) aufgenommene Kolben (5) in Eingriff stehen, die durch den Nocken oder Exzenter (3) aufeinanderfolgend in radialer Richtung verschiebbar sind, dadurch gekennzeichnet, dass an der von der Verbrennungskraftmaschine abgewandten Seite der Hochdruck-Radialkolbenpumpe (1 ) eine Niederdruckeinheit (6) und daran eine Zahnradpumpe (7) befestigt ist, dass die Niederdruckeinheit (6) die niederdruckseitigen Anschlüsse (24, 25) der Hochdruck-Radialkolbenpumpe (1 ) umfasst, die Anschlüsse des Vorlaufs (8) und Rücklaufs (9) der Zahnradpumpe (7) und die Anschlüsse des Vorlaufs (10) und des Rücklaufs (1 1 ) der Kraftstoffversorgung.1 . Device for supplying fuel to an internal combustion engine, comprising a high-pressure radial piston pump (1) with a drive shaft (2) received therein and rotating about an axis with a radially projecting cam or eccentric (3), with which at least one in a cylinder (4) recorded piston (5) are engaged, which are successively displaced in the radial direction by the cam or eccentric (3), characterized in that on the side facing away from the internal combustion engine side of the high-pressure radial piston pump (1), a low-pressure unit (6) and thereto a gear pump (7) is mounted, that the low-pressure unit (6) comprises the low-pressure side connections (24, 25) of the high-pressure radial piston pump (1), the connections of the flow (8) and return (9) of the gear pump (7) and the Connections of the flow (10) and the return (1 1) of the fuel supply.
2. Vorrichtung nach Anspruch 1 , dadurch gekennzeichnet, dass die Niederdruckeinheit (6) ein Entlüftungsventil (12) und/oder ein Überdruckventil (13) enthält. 2. Apparatus according to claim 1, characterized in that the low pressure unit (6) includes a vent valve (12) and / or a pressure relief valve (13).
3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass das Entlüftungsventil (12) und/oder das Überdruckventil (13) in funktionsfähigen Modulen enthalten sind und dass die Module in Bohrungen der Niederdruckeinheit (6) eingefügt sind.3. A device according to claim 2, characterized in that the vent valve (12) and / or the pressure relief valve (13) are contained in functional modules and that the modules are inserted into bores of the low-pressure unit (6).
4. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Niederdruckeinheit (6) ein Kraftstofffilter enthält oder einen Vorlaufanschluss (14) und einen Rücklaufanschluss (15) für den Anschluss eines externen Kraftstofffilters.4. Device according to one of claims 1 to 3, characterized in that the low-pressure unit (6) contains a fuel filter or a flow connection (14) and a return port (15) for the connection of an external fuel filter.
5. Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Niederdruckeinheit (6) eine Nullförderdrossel (16) und einen Anschluss (17) für ein Zumessventil umfasst. 5. Device according to one of claims 1 to 4, characterized in that the low-pressure unit (6) comprises a zero-feed throttle (16) and a connection (17) for a metering valve.
PCT/EP2009/059029 2008-09-15 2009-07-15 Device for the fuel supply of an internal combustion engine WO2010028887A1 (en)

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DE102008042075A DE102008042075A1 (en) 2008-09-15 2008-09-15 Device for supplying fuel to an internal combustion engine

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Publication number Priority date Publication date Assignee Title
CN103649520B (en) * 2011-05-13 2016-05-04 株式会社三国 Fuel under high pressure pump installation
DE102016209726A1 (en) * 2016-06-02 2017-12-07 Robert Bosch Gmbh High pressure pump for a fuel injection system

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EP1253313A1 (en) * 2000-01-31 2002-10-30 Bosch Automotive Systems Corporation Fuel injection pump
EP1306548A2 (en) * 2001-10-27 2003-05-02 Robert Bosch Gmbh Fuel injection apparatus in which the displacement control is improved
EP1512866A2 (en) * 2003-09-03 2005-03-09 Denso Corporation Fuel injection pump having filter
DE102006039323B3 (en) * 2006-08-22 2007-08-23 Siemens Ag Fluid pump unit e.g. fuel pump unit, for e.g. diesel injection system of internal combustion engine, has two pumps respectively exhibiting drive shafts mounted in housing, where drive shafts are rotatably coupled by sleeve free-wheel
DE102007044499A1 (en) * 2007-09-18 2009-03-19 Robert Bosch Gmbh Fuel pump, in particular for a fuel system of a piston internal combustion engine
DE102007057503A1 (en) 2007-11-29 2009-06-04 Robert Bosch Gmbh Radial piston pump for providing high pressure fuel supply in common rail injection system of internal-combustion engine, has low pressure channel provided in distributor element, where channel hydraulically connects pump element with inlet

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DE10247142A1 (en) 2002-10-09 2004-04-22 Robert Bosch Gmbh High pressure pump for fuel injection device has pump housing with body and cap to cover each pump element

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1253313A1 (en) * 2000-01-31 2002-10-30 Bosch Automotive Systems Corporation Fuel injection pump
EP1306548A2 (en) * 2001-10-27 2003-05-02 Robert Bosch Gmbh Fuel injection apparatus in which the displacement control is improved
EP1512866A2 (en) * 2003-09-03 2005-03-09 Denso Corporation Fuel injection pump having filter
DE102006039323B3 (en) * 2006-08-22 2007-08-23 Siemens Ag Fluid pump unit e.g. fuel pump unit, for e.g. diesel injection system of internal combustion engine, has two pumps respectively exhibiting drive shafts mounted in housing, where drive shafts are rotatably coupled by sleeve free-wheel
DE102007044499A1 (en) * 2007-09-18 2009-03-19 Robert Bosch Gmbh Fuel pump, in particular for a fuel system of a piston internal combustion engine
DE102007057503A1 (en) 2007-11-29 2009-06-04 Robert Bosch Gmbh Radial piston pump for providing high pressure fuel supply in common rail injection system of internal-combustion engine, has low pressure channel provided in distributor element, where channel hydraulically connects pump element with inlet

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