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WO2010000522A1 - Piston fuel pump for an internal combustion engine - Google Patents

Piston fuel pump for an internal combustion engine Download PDF

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Publication number
WO2010000522A1
WO2010000522A1 PCT/EP2009/055353 EP2009055353W WO2010000522A1 WO 2010000522 A1 WO2010000522 A1 WO 2010000522A1 EP 2009055353 W EP2009055353 W EP 2009055353W WO 2010000522 A1 WO2010000522 A1 WO 2010000522A1
Authority
WO
WIPO (PCT)
Prior art keywords
cam
fuel pump
drive shaft
piston
piston fuel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2009/055353
Other languages
German (de)
French (fr)
Inventor
Friedrich Boecking
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 WO2010000522A1 publication Critical patent/WO2010000522A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • F02M59/10—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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/02—Fuel-injection apparatus having means for reducing wear

Definitions

  • the invention relates to a piston fuel pump according to the preamble of claim 1.
  • a piston fuel pump of the type mentioned above is known for example from DE 103 22 604 Al.
  • This includes a housing, which may for example also be the engine block of the internal combustion engine.
  • a drive shaft is mounted, and the housing has a plurality of openings into which identical delivery modules can be inserted.
  • the conveyor modules form the cylinder of the piston pump, so they include a cylinder liner, a piston, etc.
  • the drive shaft has a cam portion.
  • Object of the present invention is to provide a piston fuel pump, which promotes the fuel as evenly as possible and has a long life.
  • a roller between a piston of a conveyor module and the drive shaft reduces the lateral forces acting on the piston and the wear on the drive shaft. This also improves the service life.
  • the cam shafts are preferably tilted ninety degrees with respect to each other, whereas with three cylinders, the cam shafts are tilted one another by sixty degrees.
  • the inventively provided uniform distribution of the cams in the circumferential direction is achieved.
  • the integration of the drive shaft in the internal combustion engine saves space, whereas an outside of the engine arranged drive shaft improves the versatility and maintainability of the piston fuel pump.
  • Figure 1 is a perspective view of a two-cylinder piston fuel pump with a separate housing
  • Figure 2 is a perspective view of a delivery module of the piston fuel pump of Figure 1;
  • Figure 4 is a schematic representation of a drive shaft of the piston fuel pump of Figure 2 seen in the axial direction;
  • Figure 5 is a view similar to Figure 2 of a three-cylinder piston fuel pump
  • Figure 6 is a view similar to Figure 4 of the drive shaft of the piston fuel pump of Figure 5;
  • Figure 7 is a schematic representation of a piston fuel pump with in the
  • a piston fuel pump carries in Figures 1 and 3 in total the reference numeral 10. It comprises a pump housing 12 and 2 arranged in series in a plane cylinder 14a and 14b.
  • the cylinders 14a and 14b are each identical in construction
  • Conveying module 16 formed, which is shown separately in Figure 2.
  • the two conveyor modules 16 are in corresponding stepped holes, which form receiving openings 18 and present in the pump housing 12, inserted and fixed by means of a flange 20 and screws 22 on the pump housing 12 (for illustrative purposes, the reference numerals in Figures 1 and 3 are only for the cylinder 14a entered.
  • a common for the conveyor modules 16 drive shaft 24 is mounted by means of three bearings 26. At its right end in Figures 1 and 3, the drive shaft 24 has a coupling piece 28 for coupling with an engine-side drive.
  • Each delivery module 16 comprises a cylinder housing 30, a piston sleeve 32, in which a piston 34 is guided, a sealing piece 36 which seals the delivery module 16 relative to the pump housing 12, a spring plate 38 fastened to the piston 34 and a piston spring tensioned between spring plate and sealing piece 36 40, which acts on the piston 34 to the drive shaft 24 back.
  • a conveyor module 16 further includes a delivery chamber 42, which is connected via not shown inlet valve with a low pressure port 44 and via a likewise not shown exhaust valve with a high pressure port 46.
  • the low-pressure connection 44 can be connected, for example, to the outlet of an electric prefeed pump, which provides a certain admission pressure.
  • the high-pressure port 46 may be connected to a fuel pressure accumulator G, to which fuel injectors for direct injection of the fuel into combustion chambers of the internal combustion engine are connected 42 temporarily forcibly connected to the low pressure port 44, whereby the flow rate of the piston fuel pump 10 can be adjusted.
  • the drive shaft 24 comprises two cam sections 50a and 50b, which each have two oppositely disposed identical cams 52 exhibit.
  • the drive shaft 24 thus has a total of four identical cams 52.
  • the highest elevations of the oppositely disposed cams 52 of the cam portion 50a are interconnected by an imaginary cam axis 54a.
  • the highest elevations of the oppositely disposed cams 52 of the cam portion 50b are interconnected by a cam axis 54b, which is also intended.
  • the cam shafts 54a and 54b are tilted about a central axis 56 of the drive shaft 24 by ninety degrees with each other. This is achieved, as can be seen from Figure 4, that all the cams 52 of the cam portions 50a and 50b, seen in the circumferential direction of the drive shaft 24, are evenly distributed, namely always at an angle of ninety degrees.
  • roller 57 is present between piston 34 and cam portion 50a and 50b. In operation, with the drive shaft 24 rotating, the roller 57 rolls on the cam portion 50a and 50b, respectively, causing the piston 34 to reciprocate.
  • FIG. 5 Another embodiment of a piston fuel pump 10 is shown in Figures 5 and 6.
  • FIG. 5 Another embodiment of a piston fuel pump 10 is shown in Figures 5 and 6.
  • elements and regions which have equivalent functions to elements and regions which have already been explained in connection with a previously described exemplary embodiment are not explained again in detail. They also carry the same reference numerals.
  • the piston fuel pump 10 of FIG. 5 is a three-cylinder piston fuel pump.
  • the corresponding cylinders 14 are provided with the indices a, b and c.
  • the drive shaft 24 comprises three cam portions 50a, 50b and 50c, each with the same cam 52. It can be seen from Figure 6, that all cams 52 of the cam portions 50a to c seen in the circumferential direction of the drive shaft 24, evenly distributed.
  • the cam shafts 54a to c are tilted about the central axis 56 of the drive shaft 24 at an angle of sixty degrees to each other.
  • the pump housing 12 is formed by an engine block 58 of the internal combustion engine, are provided in the receiving openings 18, in which the conveyor modules 16 are inserted.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)

Abstract

The invention relates to a piston fuel pump for an internal combustion engine, comprising a housing, a plurality of cylinders which are arranged in-line and which are composed of identical supply modules, which are inserted into corresponding receiving openings in the housing, and a common driveshaft (24) for the supply modules, said driveshaft including a cam section (50a, 50b) for each supply module. It is proposed that the cam section (50a, 50b) of a supply module comprises two opposed identical cams (52), the highest elevations of which are joined to each other by a cam axis (54a, 54b), and that the cam axes (54a, 54b) of the cam sections (50a, 50b) are tilted toward each other about the center axis (56) of the driveshaft (24) in such a way that all cams (52), viewed in the circumferential direction of the driveshaft (24), are evenly distributed.

Description

Beschreibung description

Titeltitle

Kolben- Kraftstoffpumpe für eine BrennkraftmaschinePiston fuel pump for an internal combustion engine

Stand der TechnikState of the art

Die Erfindung betrifft eine Kolben-Kraftstoffpumpe nach dem Oberbegriff des Anspruchs 1.The invention relates to a piston fuel pump according to the preamble of claim 1.

Eine Kolben- Kraftstoffpumpe der eingangsgenannten Art ist beispielsweise aus der DE 103 22 604 Al bekannt. Diese umfasst ein Gehäuse, bei dem es sich beispielsweise auch um den Motorblock der Brennkraftmaschine handeln kann. In dem Gehäuse ist eine Antriebswelle gelagert, und das Gehäuse weist mehrere Öffnungen auf, in welches baugleiche Fördermodule eingesteckt werden können. Die Fördermodule bilden die Zylinder der Kolbenpumpe, sie umfassen also eine Zylinderbuchse, einen Kolben etc. Um den Kolben eines Fördermoduls in die für die Förderung notwendige Hin- undA piston fuel pump of the type mentioned above is known for example from DE 103 22 604 Al. This includes a housing, which may for example also be the engine block of the internal combustion engine. In the housing, a drive shaft is mounted, and the housing has a plurality of openings into which identical delivery modules can be inserted. The conveyor modules form the cylinder of the piston pump, so they include a cylinder liner, a piston, etc. To the piston of a conveyor module in the necessary for the promotion back and forth

Herbewegung versetzen zu können, verfügt die Antriebswelle über einen Nockenabschnitt.To enable movement, the drive shaft has a cam portion.

Offenbarung der ErfindungDisclosure of the invention

Aufgabe der vorliegenden Erfindung ist es, eine Kolben- Kraftstoffpumpe zu schaffen, welche den Kraftstoff möglichst gleichmäßig fördert und eine lange Lebensdauer aufweist.Object of the present invention is to provide a piston fuel pump, which promotes the fuel as evenly as possible and has a long life.

Diese Aufgabe wird durch eine Kolben-Kraftstoffpumpe mit den Merkmalen des Anspruchs 1 gelöst. Vorteilhafte Weiterbildungen der Erfindung sind in Unteransprüchen angegeben. Darüber hinaus finden sich für die Erfindung wichtige Merkmale in der nachfolgendenThis object is achieved by a piston fuel pump with the features of claim 1. Advantageous developments of the invention are specified in subclaims. In addition, find important features for the invention in the following

Beschreibung und der Zeichnung. Dabei können diese Merkmale für die Erfindung sowohl in Alleinstellung als auch in unterschiedlichen Kombinationen wichtig sein, ohne dass hierauf nochmals explizit hingewiesen wird.Description and the drawing. These features may be important for the invention both alone and in different combinations, without being explicitly referred to again.

Durch die im Grunde symmetrische Anordnung der beiden Nocken eines Nockenabschnitts und die in Umfangsrichtung der Antriebswelle gesehen gleichmäßige Verteilung der Nocken aller Nockenabschnitte wird erreicht, dass die auf die Antriebswelle wirkenden Lasten, insbesondere Biegemomente, vergleichsweise gering sind, wodurch die Lebensdauer der erfindungsgemäßen Kolben- Kraftstoffpumpe hoch ist. Außerdem wird durch die Anordnung der Nocken ein gleichmäßiger Förderstrom erreicht, mit vergleichsweise geringen Druckspitzen, was ebenfalls der Lebensdauer der Kolben- Kraftstoffpumpe zugute kommt.Due to the basically symmetrical arrangement of the two cams of a cam portion and in the circumferential direction of the drive shaft uniform distribution of the cam of all cam sections is achieved that the forces acting on the drive shaft loads, in particular bending moments, are comparatively small, whereby the life of the inventive piston fuel pump is high. In addition, a uniform flow rate is achieved by the arrangement of the cam, with comparatively low pressure peaks, which also benefits the life of the piston fuel pump.

Eine Laufrolle zwischen einem Kolben eines Fördermoduls und der Antriebswelle reduziert die auf den Kolben wirkenden Querkräfte und den Verschleiß an der Antriebswelle. Auch hierdurch wird die Lebensdauer verbessert.A roller between a piston of a conveyor module and the drive shaft reduces the lateral forces acting on the piston and the wear on the drive shaft. This also improves the service life.

Bei zwei Zylindern sind die Nockenachsen vorzugsweise um neunzig Grad zueinander verkippt, wohingegen bei drei Zylindern die Nockenachsen zueinander um sechzig Grad verkippt sind. Hierdurch wird die erfindungsgemäß vorgesehene gleichmäßige Verteilung der Nocken in Umfangsrichtung erreicht.With two cylinders, the cam shafts are preferably tilted ninety degrees with respect to each other, whereas with three cylinders, the cam shafts are tilted one another by sixty degrees. As a result, the inventively provided uniform distribution of the cams in the circumferential direction is achieved.

Die Integration der Antriebswelle in die Brennkraftmaschine spart Platz, wohingegen eine außerhalb der Brennkraftmaschine angeordnete Antriebswelle die Einsatzflexibilität und die Wartbarkeit der Kolben- Kraftstoffpumpe verbessert.The integration of the drive shaft in the internal combustion engine saves space, whereas an outside of the engine arranged drive shaft improves the versatility and maintainability of the piston fuel pump.

Nachfolgend werden Ausführungsformen der Erfindung unter Bezugnahme auf die beiliegende Zeichnung erläutert. In der Zeichnung zeigen:Hereinafter, embodiments of the invention will be explained with reference to the accompanying drawings. In the drawing show:

Figur 1 eine perspektivische Darstellung einer Zwei-Zylinder- Kolben- Kraftstoffpumpe mit separatem Gehäuse;Figure 1 is a perspective view of a two-cylinder piston fuel pump with a separate housing;

Figur 2 eine perspektivische Darstellung eines Fördermoduls der Kolben- Kraftstoffpumpe von Figur 1;Figure 2 is a perspective view of a delivery module of the piston fuel pump of Figure 1;

Figur 3 einen Längsschnitt durch die Kolben- Kraftstoffpumpe von Figur 2;3 shows a longitudinal section through the piston fuel pump of Figure 2;

Figur 4 eine schematische Darstellung einer Antriebswelle der Kolben- Kraftstoffpumpe von Figur 2 in Achsrichtung gesehen;Figure 4 is a schematic representation of a drive shaft of the piston fuel pump of Figure 2 seen in the axial direction;

Figur 5 eine Darstellung ähnlich Figur 2 einer Drei-Zylinder- Kolben- Kraftstoffpumpe;Figure 5 is a view similar to Figure 2 of a three-cylinder piston fuel pump;

Figur 6 eine Darstellung ähnlich Figur 4 der Antriebswelle der Kolben- Kraftstoffpumpe von Figur 5;Figure 6 is a view similar to Figure 4 of the drive shaft of the piston fuel pump of Figure 5;

Figur 7 eine schematische Darstellung einer Kolben- Kraftstoffpumpe mit in dieFigure 7 is a schematic representation of a piston fuel pump with in the

Brennkraftmaschine integrierter Antriebswelle. Eine Kolben- Kraftstoffpumpe trägt in den Figuren 1 und 3 insgesamt das Bezugszeichen 10. Sie umfasst ein Pumpengehäuse 12 und 2 in Reihe in einer Ebene angeordnete Zylinder 14a und 14b. Die Zylinder 14a und 14b sind jeweils durch ein baugleichesInternal combustion engine integrated drive shaft. A piston fuel pump carries in Figures 1 and 3 in total the reference numeral 10. It comprises a pump housing 12 and 2 arranged in series in a plane cylinder 14a and 14b. The cylinders 14a and 14b are each identical in construction

Fördermodul 16 gebildet, welches separat in Figur 2 gezeigt ist. Die beiden Fördermodule 16 sind in entsprechende Stufenbohrungen, welche Aufnahmeöffnungen 18 bilden und im Pumpengehäuse 12 vorhanden sind, eingesteckt und mittels eines Flansches 20 und Schrauben 22 am Pumpengehäuse 12 befestigt (aus Darstellungsgründen sind die Bezugszeichen in den Figuren 1 und 3 nur für den Zylinder 14a eingetragen.Conveying module 16 formed, which is shown separately in Figure 2. The two conveyor modules 16 are in corresponding stepped holes, which form receiving openings 18 and present in the pump housing 12, inserted and fixed by means of a flange 20 and screws 22 on the pump housing 12 (for illustrative purposes, the reference numerals in Figures 1 and 3 are only for the cylinder 14a entered.

In dem Pumpengehäuse 12 ist eine für die Fördermodule 16 gemeinsame Antriebswelle 24 mittels dreier Lager 26 gelagert. An ihrem in den Figuren 1 und 3 rechten Ende verfügt die Antriebswelle 24 über ein Kupplungsstück 28 zur Kupplung mit einem brennkraftmaschinenseitigen Antrieb.In the pump housing 12, a common for the conveyor modules 16 drive shaft 24 is mounted by means of three bearings 26. At its right end in Figures 1 and 3, the drive shaft 24 has a coupling piece 28 for coupling with an engine-side drive.

Jedes Fördermodul 16 umfasst ein Zylindergehäuse 30, eine Kolbenbuchse 32, in der ein Kolben 34 geführt ist, ein Dichtstück 36, welches das Fördermodul 16 gegenüber dem Pumpengehäuse 12 abdichtet, einen am Kolben 34 befestigten Federteller 38 und eine zwischen Federteller und Dichtstück 36 verspannte Kolbenfeder 40, die den Kolben 34 zur Antriebswelle 24 hin beaufschlagt.Each delivery module 16 comprises a cylinder housing 30, a piston sleeve 32, in which a piston 34 is guided, a sealing piece 36 which seals the delivery module 16 relative to the pump housing 12, a spring plate 38 fastened to the piston 34 and a piston spring tensioned between spring plate and sealing piece 36 40, which acts on the piston 34 to the drive shaft 24 back.

Zu einem Fördermodul 16 gehören ferner ein Förderraum 42, der über nicht gezeigtes Einlassventil mit einem Niederdruckanschluss 44 und über ein ebenfalls nicht gezeigtes Auslassventil mit einem Hochdruckanschluss 46 verbindbar ist. Der Niederdruckanschluss 44 kann beispielsweise mit dem Auslas einer elektrischen Vorförderpumpe verbunden werden, die einen gewissen Vordruck bereit stellt. Der Hochdruckanschluss 46 wiederum kann mit einem Kraftstoffdruckspeicher G,common-raN") verbunden sein, an den Kraftstoffinjektoren zur direkten Einspritzung des Kraftstoffs in Brennräume der Brennkraftmaschine angeschlossen sind. Zu einem Fördermodul 16 kann ferner ein elektromagnetisch betätigtes Mengensteuerventil 48 gehören, durch welches der Förderraum 42 zeitweise zwangsweise mit dem Niederdruckanschluss 44 verbunden werden kann, wodurch die Fördermenge der Kolben- Kraftstoffpumpe 10 eingestellt werden kann.To a conveyor module 16 further includes a delivery chamber 42, which is connected via not shown inlet valve with a low pressure port 44 and via a likewise not shown exhaust valve with a high pressure port 46. The low-pressure connection 44 can be connected, for example, to the outlet of an electric prefeed pump, which provides a certain admission pressure. The high-pressure port 46, in turn, may be connected to a fuel pressure accumulator G, to which fuel injectors for direct injection of the fuel into combustion chambers of the internal combustion engine are connected 42 temporarily forcibly connected to the low pressure port 44, whereby the flow rate of the piston fuel pump 10 can be adjusted.

Die Ausgestaltung der für beide Fördermodule 16 gemeinsamen Antriebswelle 24 geht aus den Figuren 3 und 4 hervor: danach umfasst die Antriebswelle 24 zwei Nockenabschnitte 50a und 50b, welche jeweils zwei entgegengesetzt angeordnete gleiche Nocken 52 aufweisen. Die Antriebswelle 24 weist also insgesamt vier gleiche Nocken 52 auf. Die höchsten Erhebungen der entgegengesetzt angeordneten Nocken 52 des Nockenabschnitts 50a sind durch ein gedachte Nockenachse 54a miteinander verbunden. Die höchsten Erhebungen der entgegengesetzt angeordneten Nocken 52 des Nockenabschnitts 50b sind durch eine ebenfalls gedachte Nockenachse 54b miteinander verbunden. Die Nockenachsen 54a und 54b sind um eine Mittelachse 56 der Antriebswelle 24 um neunzig Grad zueinander verkippt. Auf diese wird erreicht, wie aus Figur 4 ersichtlich ist, dass alle Nocken 52 der Nockenabschnitte 50a und 50b, in Umfangsrichtung der Antriebswelle 24 gesehen, gleichmäßig verteilt sind, nämlich immer in einem Winkel von neunzig Grad.The configuration of the drive shaft 24 common to both conveyor modules 16 can be seen in FIGS. 3 and 4: Thereafter, the drive shaft 24 comprises two cam sections 50a and 50b, which each have two oppositely disposed identical cams 52 exhibit. The drive shaft 24 thus has a total of four identical cams 52. The highest elevations of the oppositely disposed cams 52 of the cam portion 50a are interconnected by an imaginary cam axis 54a. The highest elevations of the oppositely disposed cams 52 of the cam portion 50b are interconnected by a cam axis 54b, which is also intended. The cam shafts 54a and 54b are tilted about a central axis 56 of the drive shaft 24 by ninety degrees with each other. This is achieved, as can be seen from Figure 4, that all the cams 52 of the cam portions 50a and 50b, seen in the circumferential direction of the drive shaft 24, are evenly distributed, namely always at an angle of ninety degrees.

Zwischen Kolben 34 und Nockenabschnitt 50a bzw. 50b ist eine Laufrolle 57 vorhanden. Im Betrieb, bei rotierender Antriebswelle 24, rollt die Laufrolle 57 auf dem Nockenabschnitt 50a bzw. 50b, wodurch der Kolben 34 in eine Hin- und Herbewegung versetzt wird.Between piston 34 and cam portion 50a and 50b, a roller 57 is present. In operation, with the drive shaft 24 rotating, the roller 57 rolls on the cam portion 50a and 50b, respectively, causing the piston 34 to reciprocate.

Eine andere Ausführungsform einer Kolben- Kraftstoffpumpe 10 ist in den Figuren 5 und 6 gezeigt. Dabei gilt hier wie nachfolgend, dass solche Elemente und Bereiche, die äquivalente Funktionen zu Elementen und Bereichen aufweisen, die bereits im Zusammenhang mit einem vorhergehend beschriebenen Ausführungsbeispiel erläutert wurden, nicht nochmals im Detail erklärt werden. Sie tragen darüber hinaus die gleichen Bezugszeichen.Another embodiment of a piston fuel pump 10 is shown in Figures 5 and 6. Here, as below, it applies that such elements and regions which have equivalent functions to elements and regions which have already been explained in connection with a previously described exemplary embodiment are not explained again in detail. They also carry the same reference numerals.

Bei der Kolben-Kraftstoffpumpe 10 von Figur 5 handelt es sich um eine Drei-Zylinder- Kolben- Kraftstoffpumpe. Die entsprechenden Zylinder 14 sind mit dem Indizes a, b und c versehen. Entsprechend umfasst die Antriebswelle 24 drei Nockenabschnitte 50a, 50b und 50c mit jeweils gleichen Nocken 52. Man erkennt aus Figur 6, dass auch hier alle Nocken 52 der Nockenabschnitte 50a bis c in Umfangsrichtung der Antriebswelle 24 gesehen, gleichmäßig verteilt sind. Hierzu sind die Nockenachsen 54a bis c um die Mittelachse 56 der Antriebswelle 24 um einen Winkel von sechzig Grad zueinander verkippt.The piston fuel pump 10 of FIG. 5 is a three-cylinder piston fuel pump. The corresponding cylinders 14 are provided with the indices a, b and c. Correspondingly, the drive shaft 24 comprises three cam portions 50a, 50b and 50c, each with the same cam 52. It can be seen from Figure 6, that all cams 52 of the cam portions 50a to c seen in the circumferential direction of the drive shaft 24, evenly distributed. For this purpose, the cam shafts 54a to c are tilted about the central axis 56 of the drive shaft 24 at an angle of sixty degrees to each other.

Die vorab beschriebenen Ausführungsbeispiele von Kolben- Kraftstoffpumpen 10 umfassten ein eigenes und von der Brennkraftmaschine separates Pumpengehäuse 12. Bei der in Figur 7 gezeigten Ausführungsform wird das Pumpengehäuse 12 durch einen Motorblock 58 der Brennkraftmaschine gebildet, in dem Aufnahmeöffnungen 18 vorhanden sind, in die die Fördermodule 16 eingesteckt werden. In the embodiment shown in Figure 7, the pump housing 12 is formed by an engine block 58 of the internal combustion engine, are provided in the receiving openings 18, in which the conveyor modules 16 are inserted.

Claims

Ansprüche claims 1. Kolben- Kraftstoffpumpe (10) für eine Brennkraftmaschine mit einem Gehäuse (12), mit mehreren in Reihe angeordneten Zylindern (14), welche durch baugleiche Fördermodule (16) gebildet sind, die in entsprechende Aufnahmeöffnungen (18) in dem Gehäuse (12) eingesteckt sind, und mit einer gemeinsamen Antriebswelle (24) für die Fördermodule (16), welche für jedes Fördermodul (16) einen Nockenabschnitt (50) aufweist, dadurch gekennzeichnet, dass der Nockenabschnitt (50) eines Fördermoduls (16) zwei entgegengesetzt angeordnete gleiche Nocken (52) aufweist, deren höchste Erhebungen durch eine Nockenachse (54) miteinander verbunden sind, und dass die Nockenachsen (54) der Nockenabschnitte (50) um die Mittelachse (56) der Antriebswelle (24) so zueinander verkippt sind, dass alle Nocken (52), in Umfangsrichtung der Antriebswelle (24) gesehen, gleichmäßig verteilt sind.A piston fuel pump (10) for an internal combustion engine having a housing (12) with a plurality of cylinders (14) arranged in series, which are formed by structurally identical conveyor modules (16) which are arranged in corresponding receiving openings (18) in the housing (12 ), and with a common drive shaft (24) for the conveyor modules (16), which for each conveyor module (16) has a cam portion (50), characterized in that the cam portion (50) of a conveyor module (16) two oppositely arranged identical cams (52) whose highest elevations are interconnected by a cam axle (54), and that the cam axes (54) of the cam portions (50) about the central axis (56) of the drive shaft (24) are tilted to each other, that all Cam (52), seen in the circumferential direction of the drive shaft (24) are evenly distributed. 2. Kolben- Kraftstoffpumpe (10) nach Anspruch 1, dadurch gekennzeichnet, dass zwischen einem Kolben (34) eines Fördermoduls (16) und der Antriebswelle eine Laufrolle (57) angeordnet ist.Second piston fuel pump (10) according to claim 1, characterized in that between a piston (34) of a conveying module (16) and the drive shaft, a roller (57) is arranged. 3. Kolben- Kraftstoffpumpe (10) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass sie zwei Zylinder (14) aufweist und die beiden Nockenachsen (54) zueinander um 90° verkippt sind.3. Piston fuel pump (10) according to any one of the preceding claims, characterized in that it comprises two cylinders (14) and the two cam shafts (54) are tilted to each other by 90 °. 4. Kolben- Kraftstoffpumpe (10) nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass sie drei Zylinder (14) aufweist und die drei Nockenachsen (54) zueinander um 60° verkippt sind.4. Piston fuel pump (10) according to any one of claims 1 or 2, characterized in that it comprises three cylinders (14) and the three cam shafts (54) are mutually tilted by 60 °. 5. Kolben- Kraftstoffpumpe (10) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Antriebswelle (24) in die Brennkraftmaschine integriert ist.5. Piston fuel pump (10) according to one of the preceding claims, characterized in that the drive shaft (24) is integrated in the internal combustion engine. 6. Kolben- Kraftstoffpumpe (10) nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Antriebswelle (24) außerhalb der Brennkraftmaschine angeordnet und mit einem Antrieb der Brennkraftmaschine gekoppelt ist. 6. Piston fuel pump (10) according to one of claims 1 to 4, characterized in that the drive shaft (24) is arranged outside of the internal combustion engine and coupled to a drive of the internal combustion engine.
PCT/EP2009/055353 2008-07-03 2009-05-04 Piston fuel pump for an internal combustion engine Ceased WO2010000522A1 (en)

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DE102008040122.6 2008-07-03
DE200810040122 DE102008040122A1 (en) 2008-07-03 2008-07-03 Piston fuel pump for an internal combustion engine

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US8120060B2 (en) 2005-11-01 2012-02-21 Massachusetts Institute Of Technology Monolithically integrated silicon and III-V electronics

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JPH02176158A (en) * 1988-12-28 1990-07-09 Nippondenso Co Ltd Variable discharge high-pressure pump
DE19706099A1 (en) * 1996-02-19 1997-08-21 Denso Corp High-pressure fuel injection system for IC engine
EP1892410A1 (en) * 2005-06-08 2008-02-27 Bosch Corporation Fuel feed pump and tappet structure

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DE10322604A1 (en) 2003-05-20 2004-12-09 Robert Bosch Gmbh Set of piston pumps, in particular fuel pumps for internal combustion engines with direct fuel injection

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JPH02176158A (en) * 1988-12-28 1990-07-09 Nippondenso Co Ltd Variable discharge high-pressure pump
DE19706099A1 (en) * 1996-02-19 1997-08-21 Denso Corp High-pressure fuel injection system for IC engine
EP1892410A1 (en) * 2005-06-08 2008-02-27 Bosch Corporation Fuel feed pump and tappet structure

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8120060B2 (en) 2005-11-01 2012-02-21 Massachusetts Institute Of Technology Monolithically integrated silicon and III-V electronics

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