WO2004048768A1 - Pump assembly comprising a high-pressure pump and a low-pressure pump that is connected upstream of said pump for a fuel injection device of an internal combustion engine - Google Patents

Pump assembly comprising a high-pressure pump and a low-pressure pump that is connected upstream of said pump for a fuel injection device of an internal combustion engine Download PDF

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Publication number
WO2004048768A1
WO2004048768A1 PCT/DE2003/003215 DE0303215W WO2004048768A1 WO 2004048768 A1 WO2004048768 A1 WO 2004048768A1 DE 0303215 W DE0303215 W DE 0303215W WO 2004048768 A1 WO2004048768 A1 WO 2004048768A1
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WO
WIPO (PCT)
Prior art keywords
pressure pump
pump
low
pump housing
housing
Prior art date
Application number
PCT/DE2003/003215
Other languages
German (de)
French (fr)
Inventor
Josef Guentert
Michael Pawella
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 WO2004048768A1 publication Critical patent/WO2004048768A1/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
    • 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
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/053—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with actuating or actuated elements at the inner ends of the cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • 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
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/006—Crankshafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C11/00—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
    • F04C11/005—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations of dissimilar working principle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F04C2/18—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with similar tooth forms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
    • F04B9/04—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms
    • F04B9/045—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms the means being eccentrics
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0057—Driving elements, brakes, couplings, transmission specially adapted for machines or pumps
    • F04C15/0076—Fixing rotors on shafts, e.g. by clamping together hub and shaft
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2210/00—Fluid
    • F04C2210/20—Fluid liquid, i.e. incompressible
    • F04C2210/203—Fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/30—Casings or housings

Definitions

  • the invention relates to a pump arrangement with a high-pressure pump and a low-pressure pump connected upstream thereof for a fuel injection device of an internal combustion engine according to the preamble of claim 1.
  • Such a pump arrangement is known from DE 197 36 160 AI.
  • the high-pressure pump has a housing in which at least one pump element and a drive shaft driving it are arranged in the interior thereof.
  • the low-pressure pump has its own pump housing, in which at least one rotating delivery element in the form of a gearwheel is arranged in a pump chamber.
  • the low pressure pump forms a complete separate unit which is flanged to the pump housing of the high pressure pump.
  • the low-pressure pump has its own drive shaft, which is coupled to the drive shaft of the high-pressure pump.
  • a disadvantage of this pump arrangement is the great manufacturing effort involved in forming a complete structural unit
  • Low-pressure pump This also causes the assembly to require a large amount of space and to be heavy. Furthermore, complex centering of the low-pressure pump on the pump housing of the high-pressure pump is also necessary in order to ensure an exact alignment of the drive shafts with respect to one another. Furthermore, complex seals on the one hand of the pump housing of the low pressure pump are on their own and on the other hand between the Pump housing of the high pressure pump and the pump housing of the low pressure pump required at the passage of the drive shafts.
  • the pump arrangement according to the invention with the features according to claim 1 has the advantage that its manufacture due to the one-piece with the pump housing of the high pressure pump
  • Low pressure pump is simplified. In addition, the installation space and weight of the pump arrangement are reduced and no further measures for centering the low-pressure pump are required.
  • the design according to claim 2 allows the formation of the pump housing of the low pressure pump in a simple manner.
  • the embodiment according to claim 5 enables storage of the at least one delivery element of the low-pressure pump in a simple manner.
  • FIG. 1 shows a pump arrangement in a longitudinal section
  • FIG. 2 shows the pump arrangement in a cross section along line II-II in FIG. 1
  • FIG. 3 shows the pump arrangement in a view in the direction of arrow III in FIG. 1 with the cover part removed.
  • Description of the embodiment 1 to 3 show a pump arrangement with a high-pressure pump 10 and a low-pressure pump 12 connected upstream thereof for a fuel injection device of an internal combustion engine, for example of a motor vehicle.
  • a high-pressure pump 10 and a low-pressure pump 12 connected upstream thereof for a fuel injection device of an internal combustion engine, for example of a motor vehicle.
  • Fuel is pumped under high pressure of up to 2000 bar, for example into a memory from which fuel is taken for injection at the internal combustion engine.
  • the low pressure pump 12 delivers fuel from a fuel reservoir to the suction side of the high pressure pump 10.
  • the high-pressure pump 10 is designed as a radial piston pump and has a housing 14 in which a drive shaft 16 is rotatably mounted about an axis 17. in the
  • High-pressure pump housing 14 is at least one or preferably a plurality of pump elements 18, which are driven by the drive shaft 16.
  • the drive shaft 16 has a shaft section 20 which is formed eccentrically to its axis of rotation 17 and on which a ring 22, for example in the form of a polygon ring, is rotatably mounted.
  • the pump elements 18 each have a pump piston 24 which is slidably guided in a cylinder bore 26 which extends at least approximately radially to the axis of rotation 17 of the drive shaft 16.
  • the pump piston 24 of each pump element 18 is supported with its piston foot 25 on the ring 22.
  • the piston foot 25 can be held in contact with the ring 22 by a spring 28, which is supported on the one hand on the high-pressure pump housing 14 and on the other hand via a spring plate 27 on the piston foot 25.
  • a pump working space 30 is delimited by the respective pump piston 24 and can be connected to a fuel supply into the fuel supply through an inlet valve 32 opening into the pump working space 30 Low pressure pump 12 fuel is required.
  • the pump working space 30 can also be connected to the reservoir by an outlet valve 34 opening towards the reservoir.
  • the drive shaft 16 protrudes with its two ends through end walls of the high-pressure pump housing 14, one end of the drive shaft 16 being driven by the internal combustion engine in a manner not shown, for example via a belt drive.
  • a pump housing 40 of the low-pressure pump 12 is at least partially integrally formed on the high-pressure pump housing 14.
  • the low-pressure pump housing 40 is formed by a wall projecting from the outside of the end wall 15 of the high-pressure pump housing 14 facing away from the interior of the high-pressure pump housing 14 in which the pump elements 18 are arranged.
  • the wall 40 extends over the outside of the end wall 15 as a self-contained ring.
  • the part of the end wall 15 lying within the wall 40 likewise forms part of the low-pressure pump housing.
  • a cover part 42 is also provided, which rests on the end face of the wall 40 facing away from the high-pressure pump housing 14 and with which High pressure pump housing 14 is connected, for example screwed.
  • a pump chamber 44 of the low-pressure pump 12 is delimited by the end wall 15 of the high-pressure pump housing 14, the wall 40 and the cover part 42.
  • the low-pressure pump 12 is designed as a gear pump and, as delivery elements, has a pair of rotating gear wheels 46, 48 arranged in the pump chamber 44 and meshing with one another on their outer circumference.
  • the pin 50 is arranged at least approximately coaxially to the axis of rotation 17 of the drive shaft 16 and has a through opening 54 in the form of a bore through which the end of the drive shaft 16 passes and projects into the pump chamber 44.
  • the end of the drive shaft 16 is rotatably connected to the gear 46 mounted on the pin 50 via a coupling element 56.
  • the coupling element 56 enables the gearwheel 46 to be driven in rotation by the drive shaft 16 and to compensate for any incorrect positions of the axis of rotation 17 of the drive shaft 16 and the axis of rotation 51 of the gearwheel 46.
  • the gear 46 is driven in rotation by the drive shaft 16 during operation of the pump arrangement and transmits this rotary movement via a spur toothing to that which is also provided with a spur toothing
  • Gear 46 on its outer circumference meshing gear 48.
  • the gearwheels 46, 48 divide the pump chamber 44 into two partial areas due to their tooth engagement, of which a first partial area forms a suction chamber 58 and a second partial area forms a pressure chamber 60.
  • the suction space 58 is via one each between the tooth grooves and the adjacent wall 40 the pump channel 44 formed delivery channel 62 connected to the pressure chamber 60.
  • the suction chamber 58 and the pressure chamber 60 each have a connection opening in the end wall 15 of the high-pressure pump housing 14 or in the cover part 42, via which the suction chamber 58 with a suction line (not shown) from the fuel reservoir and the pressure chamber 60 via channels (not shown in detail) in the high-pressure pump housing 14 with the Inlet valves 32 of the pump elements 18 of the high pressure pump 10 is connected.
  • the connection opening in the suction space 58 forms one
  • Inlet opening 64 and the connection opening into pressure chamber 60 form an outlet opening 66.
  • fuel is conveyed from the suction chamber 58 into the pressure chamber 60 through the delivery channels 62 by the gearwheels 62.
  • the gears 46, 48 are arranged with their outer circumference at a short distance from the inside of the wall 40, which delimits the pump chamber 44 in the radial direction with respect to the axes of rotation 51, 53 of the gears 46, 48.
  • the gear wheels 46, 48 are arranged in the direction of their axes of rotation 51, 53 with a small distance between the outside of the end wall 15 of the high-pressure pump housing 14 facing away from the interior and the inside of the cover part 42 in the pump chamber 44.
  • the outside of the end wall 15 and the inside of the cover part 42 form axial bearings for the gears 46, 48, on which the gears 46, 48 can come to rest with their end faces.
  • the flatness, the pore class and the surface roughness of the outside of the end wall 15 and the inside of the cover part 42 are precisely specified in order to achieve safe operation and good efficiency of the low-pressure pump 12.
  • the high-pressure pump housing 14 with the integrally molded wall 40 is preferably made of gray cast iron.
  • the Gears 46, 48 are preferably made of steel, for example sintered steel.
  • the cover part 42 can be made of aluminum, steel or cast iron.
  • an annular groove 68 can be introduced, into which an elastic sealing element 70 is inserted, by means of which the pump chamber 44 is sealed between the wall 40 and the cover part 42.
  • the annular groove 68, in which the sealing element 70 is inserted is formed in the cover part 42, where it is easier to manufacture than in the wall 40. Further sealing of the low-pressure pump 12 is not necessary, since the wall 40 is integral with the high-pressure pump housing 14 is formed and the passage of the drive shaft 16 takes place within the pump chamber 44.

Abstract

The invention relates to a pump assembly comprising a high-pressure pump (10) provided with a pump housing (14), in which at least one pump element (18) and a corresponding drive shaft (16) for said element are located in an inner chamber. The low-pressure pump (12) has a pump housing (15, 40, 42), provided with a pump chamber (44), which contains at least one delivery element (46, 48) that rotates at least indirectly by means of the drive shaft (16) of the high-pressure pump (10). The low-pressure pump housing (15, 40) is configured at least partially in one piece on the high-pressure pump housing (14).

Description

Pumpenanordnung mit einer Hochdruckpumpe und einer dieser vorgeschalteten Niederdruckpumpe für eine Kraftstoffeinspritzeinrichtung einer BrennkraftmaschinePump arrangement with a high-pressure pump and a low-pressure pump connected upstream thereof for a fuel injection device of an internal combustion engine
Stand der TechnikState of the art
Die Erfindung geht aus von einer Pumpenanordnung mit einer Hochdruckpumpe und einer dieser vorgeschalteten Niederdruckpumpe für eine Kraftstoffeinspritzeinrichtung einer Brennkraftmaschine nach der Gattung des Anspruchs 1.The invention relates to a pump arrangement with a high-pressure pump and a low-pressure pump connected upstream thereof for a fuel injection device of an internal combustion engine according to the preamble of claim 1.
Eine solche Pumpenanordnung ist durch die DE 197 36 160 AI bekannt. Bei dieser Pumpenanordnung weist die Hochdruckpumpe ein Gehäuse auf, in dem in dessen Innenraum wenigstens ein Pumpenelement und eine dieses antreibende Antriebswelle angeordnet sind. Die Niederdruckpumpe weist ein eigenes Pumpengehäuse auf, in dem in einer Pumpenkammer wenigstens ein rotierendes Förderelement in Form eines Zahnrads angeordnet ist. Die Niederdruckpumpe bildet für sich eine vollständige separate Baueinheit, die an das Pumpengehäuse der Hochdruckpumpe angeflanscht ist. Die Niederduckpumpe weist eine eigene Antriebswelle auf, die an die Antriebswelle der Hochdruckpumpe angekuppelt ist. Nachteilig bei dieser Pumpenanordnung ist der große Fertigungsaufwand bei der eine vollständige Baueinheit bildendenSuch a pump arrangement is known from DE 197 36 160 AI. In this pump arrangement, the high-pressure pump has a housing in which at least one pump element and a drive shaft driving it are arranged in the interior thereof. The low-pressure pump has its own pump housing, in which at least one rotating delivery element in the form of a gearwheel is arranged in a pump chamber. The low pressure pump forms a complete separate unit which is flanged to the pump housing of the high pressure pump. The low-pressure pump has its own drive shaft, which is coupled to the drive shaft of the high-pressure pump. A disadvantage of this pump arrangement is the great manufacturing effort involved in forming a complete structural unit
Niederdruckpumpe. Dies verursacht außerdem auch, dass die Baueinheit einen großen Bauraum erfordert und ein hohes Gewicht aufweist. Weiterhin ist auch eine aufwendige Zentrierung der Niederdruckpumpe am Pumpengehäuse der Hochdruckpumpe erforderlich, um eine genaue Ausrichtung der Antriebswellen zueinander sicherzustellen. Weiterhin sind aufwendige Abdichtungen einerseits des Pumpengehäuses der Niederdruckpumpe für sich und andererseits zwischen dem Pumpengehäuse der Hochdruckpumpe und dem Pumpengehäuse der Niederdruckpumpe am Durchtritt der Antriebswellen erforderlich.Low-pressure pump. This also causes the assembly to require a large amount of space and to be heavy. Furthermore, complex centering of the low-pressure pump on the pump housing of the high-pressure pump is also necessary in order to ensure an exact alignment of the drive shafts with respect to one another. Furthermore, complex seals on the one hand of the pump housing of the low pressure pump are on their own and on the other hand between the Pump housing of the high pressure pump and the pump housing of the low pressure pump required at the passage of the drive shafts.
Vorteile der ErfindungAdvantages of the invention
Die erfindungsgemäße Pumpenanordnung mit den Merkmalen gemäß Anspruch 1 hat demgegenüber den Vorteil, dass deren Fertigung infolge des mit dem Pumpengehäuse der Hochdruckpumpe einstückigen Pumpengehäuses derThe pump arrangement according to the invention with the features according to claim 1 has the advantage that its manufacture due to the one-piece with the pump housing of the high pressure pump
Niederdruckpumpe vereinfacht ist. Ausserdem sind Bauraum und Gewicht der Pumpenanordnung reduziert und es sind keine weiteren Maßnahmen zur Zentrierung der Niederdruckpumpe erforderlich.Low pressure pump is simplified. In addition, the installation space and weight of the pump arrangement are reduced and no further measures for centering the low-pressure pump are required.
In den abhängigen Ansprüchen sind vorteilhafte Ausgestaltungen und Weiterbildungen der erfindungsgemäßen Pumpenanordnung angegeben. Die Ausbildung gemäß Anspruch 2 ermöglicht auf einfache Weise die Bildung des Pumpengehäuses der Niederdruckpumpe. Die Ausbildung gemäß Anspruch 5 ermöglicht auf einfache Weise eine Lagerung des wenigstens einen Förderelements der Niederdruckpumpe.Advantageous refinements and developments of the pump arrangement according to the invention are specified in the dependent claims. The design according to claim 2 allows the formation of the pump housing of the low pressure pump in a simple manner. The embodiment according to claim 5 enables storage of the at least one delivery element of the low-pressure pump in a simple manner.
Zeichnungdrawing
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 eine Pumpenanordnung in einem Längsschnitt, Figur 2 die Pumpenanordnung in einem Querschnitt entlang Linie II-II in Figur 1 und Figur 3 die Pumpenanordnung in einer Ansicht in Pfeilrichtung III in Figur 1 bei entferntem Deckelteil.An embodiment of the invention is shown in the drawing and explained in more detail in the following description. 1 shows a pump arrangement in a longitudinal section, FIG. 2 shows the pump arrangement in a cross section along line II-II in FIG. 1, and FIG. 3 shows the pump arrangement in a view in the direction of arrow III in FIG. 1 with the cover part removed.
Beschreibung des Ausführungsbeispiels In den Figuren 1 bis 3 ist eine Pumpenanordnung mit einer Hochdruckpumpe 10 und einer dieser vorgeschalteten Niederdruckpumpe 12 für eine Kraftstoffeinspritzeinrichtung einer Brennkraftmaschine beispielsweise eines Kraftfahrzeugs dargestellt. Durch die Hochdruckpumpe 10 wird dabeiDescription of the embodiment 1 to 3 show a pump arrangement with a high-pressure pump 10 and a low-pressure pump 12 connected upstream thereof for a fuel injection device of an internal combustion engine, for example of a motor vehicle. Through the high pressure pump 10
Kraftstoff unter Hochdruck von bis zu 2000 bar gefördert, beispielsweise in einen Speicher, aus dem Kraftstoff zur Einspritzung an der Brennkraftmaschine entnommen wird. Durch die Niederdruckpumpe 12 wird Kraftstoff aus einem Kraftstoffvorratsbehälter zur Saugseite der Hochdruckpumpe 10 gefördert.Fuel is pumped under high pressure of up to 2000 bar, for example into a memory from which fuel is taken for injection at the internal combustion engine. The low pressure pump 12 delivers fuel from a fuel reservoir to the suction side of the high pressure pump 10.
Die Hochdruckpumpe 10 ist als Radialkolbenpumpe ausgebildet und weist ein Gehäuse 14 auf, in dem eine Antriebswelle 16 um eine Achse 17 drehbar gelagert ist. ImThe high-pressure pump 10 is designed as a radial piston pump and has a housing 14 in which a drive shaft 16 is rotatably mounted about an axis 17. in the
Hochdruckpumpengehäuse 14 ist wenigstens ein bzw. sind vorzugsweise mehrere Pumpenelemente 18 angeordnet, die durch die Antriebswelle 16 angetrieben werden. Die Antriebswelle 16 weist einen exzentrisch zu ihrer Drehachse 17 ausgebildeten Wellenabschnitt 20 auf, auf dem ein Ring 22, beispielsweise in Form eines Polygonrings, drehbar gelagert ist. Die Pumpenelemente 18 weisen jeweils einen Pumpenkolben 24 auf, der in einer zumindest annähernd radial zur Drehachse 17 der Antriebswelle 16 verlaufenden Zylinderbohrung 26 verschiebbar dicht geführt ist. Der Pumpenkolben 24 jedes Pumpenelements 18 stützt sich mit seinem Kolbenfuß 25 am Ring 22 ab. Der Kolbenfuß 25 kann dabei durch eine Feder 28, die sich einerseits am Hochdruckpumpengehäuse 14 und andererseits über einen Federteller 27 am Kolbenfuß 25 abstützt, in Anlage am Ring 22 gehalten werden.High-pressure pump housing 14 is at least one or preferably a plurality of pump elements 18, which are driven by the drive shaft 16. The drive shaft 16 has a shaft section 20 which is formed eccentrically to its axis of rotation 17 and on which a ring 22, for example in the form of a polygon ring, is rotatably mounted. The pump elements 18 each have a pump piston 24 which is slidably guided in a cylinder bore 26 which extends at least approximately radially to the axis of rotation 17 of the drive shaft 16. The pump piston 24 of each pump element 18 is supported with its piston foot 25 on the ring 22. The piston foot 25 can be held in contact with the ring 22 by a spring 28, which is supported on the one hand on the high-pressure pump housing 14 and on the other hand via a spring plate 27 on the piston foot 25.
Durch den jeweiligen Pumpenkolben 24 wird ein Pumpenarbeitsraum 30 begrenzt, der durch ein in den Pumpenarbeitsraum 30 öffnendes Einlassventil 32 mit einer KraftstoffZuführung verbindbar ist, in die durch die Niederdruckpumpe 12 Kraftstoff gefordert wird. Der Pumpenarbeitsraum 30 ist außerdem durch ein zum Speicher hin öffnendes Auslassventil 34 mit dem Speicher verbindbar. Bei der Rotation der Antriebswelle 16 wird der Pumpenkolben 24 über den exzentrischen Wellenabschnitt 20 der Antriebswelle 16 und den Ring 22 in einer Hubbewegung angetrieben. Wenn der Pumpenkolben 24 sich radial nach innen bewegt, so fuhrt dieser einen Saughub aus, wobei das Einlassventil 32 geöffnet ist, so dass Kraftstoff in den Pumpenarbeitsraum 30 einströmt, wahrend das Auslassventil 34 geschlossen ist.A pump working space 30 is delimited by the respective pump piston 24 and can be connected to a fuel supply into the fuel supply through an inlet valve 32 opening into the pump working space 30 Low pressure pump 12 fuel is required. The pump working space 30 can also be connected to the reservoir by an outlet valve 34 opening towards the reservoir. When the drive shaft 16 rotates, the pump piston 24 is driven in a stroke movement via the eccentric shaft section 20 of the drive shaft 16 and the ring 22. When the pump piston 24 moves radially inward, it carries out a suction stroke, the inlet valve 32 being open, so that fuel flows into the pump working space 30 while the outlet valve 34 is closed.
Wenn der Pumpenkolben 24 sich radial nach außen bewegt, so fuhrt dieser einen Forderhub aus, wobei das Einlassventil 32 geschlossen ist und der vom Pumpenkolben 24 verdichtete Kraftstoff durch das geöffnete Auslassventil 34 unter hohem Druck in den Speicher gelangt.When the pump piston 24 moves radially outward, it executes a delivery stroke, the inlet valve 32 being closed and the fuel compressed by the pump piston 24 entering the accumulator under high pressure through the opened outlet valve 34.
Die Antriebswelle 16 ragt mit ihren beiden Enden durch Stirnwände des Hochdruckpumpengehause 14 heraus, wobei das eine Ende der Antriebswelle 16 in nicht naher dargestellter Weise, beispielsweise über einen Riemenantrieb, durch die Brennkraftmaschine angetrieben wird. Auf der Seite des anderen, dem Antrieb abgewandten Endes der Antriebswelle 16 ist am Hochdruckpumpengehause 14 einstuckig zumindest teilweise ein Pumpengehause 40 der Niederdruckpumpe 12 angeformt. Das Niederdruckpumpengehause 40 ist dabei durch eine von der dem Innenraum des Hochdruckpumpengehauses 14, in dem die Pumpenelemente 18 angeordnet sind, abgewandten Aussenseite der Stirnwand 15 des Hochdruckpumpengehauses 14 abstehende Wandung gebildet. Die Wandung 40 verlauft über die Aussenseite der Stirnwand 15 als in sich geschlossener Ring. Der innerhalb der Wandung 40 liegende Teil der Stirnwand 15 bildet ebenfalls einen Teil des Niederdruckpumpengehauses. Zur Bildung des vollständigen Niederdruckpumpengehauses ist noch ein Deckelteil 42 vorgesehen, das auf der dem Hochdruckpumpengehause 14 abgewandten Stirnseite der Wandung 40 aufliegt und mit dem Hochdruckpumpengehäuse 14 verbunden, beispielsweise verschraubt ist. Durch die Stirnwand 15 des Hochdruckpumpengehäuses 14, die Wandung 40 und das Deckelteil 42 wird eine Pumpenkammer 44 der Niederdruckpumpe 12 begrenzt.The drive shaft 16 protrudes with its two ends through end walls of the high-pressure pump housing 14, one end of the drive shaft 16 being driven by the internal combustion engine in a manner not shown, for example via a belt drive. On the side of the other end of the drive shaft 16 facing away from the drive, a pump housing 40 of the low-pressure pump 12 is at least partially integrally formed on the high-pressure pump housing 14. The low-pressure pump housing 40 is formed by a wall projecting from the outside of the end wall 15 of the high-pressure pump housing 14 facing away from the interior of the high-pressure pump housing 14 in which the pump elements 18 are arranged. The wall 40 extends over the outside of the end wall 15 as a self-contained ring. The part of the end wall 15 lying within the wall 40 likewise forms part of the low-pressure pump housing. To form the complete low-pressure pump housing, a cover part 42 is also provided, which rests on the end face of the wall 40 facing away from the high-pressure pump housing 14 and with which High pressure pump housing 14 is connected, for example screwed. A pump chamber 44 of the low-pressure pump 12 is delimited by the end wall 15 of the high-pressure pump housing 14, the wall 40 and the cover part 42.
Die Niederdruckpumpe 12 ist als Zahnradpumpe ausgebildet und weist als Förderelemente ein Paar in der Pumpenkammer 44 angeordneter, rotierender und an ihrem Außenumfang miteinander kämmender Zahnräder 46,48 auf. An der Stirnwand 15 des Hochdruckpumpengehäuses 14 sind vorzugsweise ebenfalls einstückig zwei in die Pumpenkammer 44 ragende Zapfen 50,52 angeformt, auf denen die Zahnräder 46,48 jeweils um eine Achse 51,53 drehbar gelagert sind. Der Zapfen 50 ist zumindest annähernd koaxial zur Drehachse 17 der Antriebswelle 16 angeordnet und weist eine Durchgangsöffnung 54 in Form einer Bohrung auf, durch die das Ende der Antriebswelle 16 hindurchtritt und in die Pumpenkammer 44 ragt. Das Ende der Antriebswelle 16 ist über ein Koppelelement 56 drehschlüssig mit dem auf dem Zapfen 50 gelagerten Zahnrad 46 verbunden. Das Koppelelement 56 ermöglicht einen rotierenden Antrieb des Zahnrads 46 durch die Antriebswelle 16 und einen Ausgleich eventueller Fehlstellungen der Drehachse 17 der Antriebswelle 16 und der Drehachse 51 des Zahnrads 46.The low-pressure pump 12 is designed as a gear pump and, as delivery elements, has a pair of rotating gear wheels 46, 48 arranged in the pump chamber 44 and meshing with one another on their outer circumference. On the end wall 15 of the high-pressure pump housing 14, two pins 50, 52 projecting into the pump chamber 44 are also preferably integrally formed, on which the gear wheels 46, 48 are each rotatably mounted about an axis 51, 53. The pin 50 is arranged at least approximately coaxially to the axis of rotation 17 of the drive shaft 16 and has a through opening 54 in the form of a bore through which the end of the drive shaft 16 passes and projects into the pump chamber 44. The end of the drive shaft 16 is rotatably connected to the gear 46 mounted on the pin 50 via a coupling element 56. The coupling element 56 enables the gearwheel 46 to be driven in rotation by the drive shaft 16 and to compensate for any incorrect positions of the axis of rotation 17 of the drive shaft 16 and the axis of rotation 51 of the gearwheel 46.
Das Zahnrad 46 wird beim Betrieb der Pumpenanordnung durch die Antriebswelle 16 rotierend angetrieben und überträgt diese Drehbewegung über eine Stirnverzahnung auf das ebenfalls mit einer Stirnverzahnung versehene, mit demThe gear 46 is driven in rotation by the drive shaft 16 during operation of the pump arrangement and transmits this rotary movement via a spur toothing to that which is also provided with a spur toothing
Zahnrad 46 an seinem Außenumfang kämmende Zahnrad 48. Die Zahnräder 46,48 teilen durch ihren Zahneingriff die Pumpenkammer 44 in zwei Teilbereiche, von denen ein erster Teilbereich einen Ansaugraum 58 und ein zweiter Teilbereich einen Druckraum 60 bildet. Der Ansaugraum 58 ist über je einen zwischen den Zahnnuten und der angrenzenden Wandung 40 der Pumpenkammer 44 gebildeten Förderkanal 62 mit dem Druckraum 60 verbunden. Der Ansaugraum 58 und der Druckraum 60 weisen jeweils eine Anschlussöffnung in der Stirnwand 15 des Hochdruckpumpengehäuses 14 oder im Deckelteil 42 auf, über die der Ansaugraum 58 mit einer nicht dargestellten Ansaugleitung vom Kraftstoffvorratsbehälter und der Druckraum 60 über nicht näher dargestellte Kanäle im Hochdruckpumpengehäuse 14 mit den Einlassventilen 32 der Pumpenelemente 18 der Hochdruckpumpe 10 verbunden ist. Die Anschlussöffnung in den Ansaugraum 58 bildet eineGear 46 on its outer circumference meshing gear 48. The gearwheels 46, 48 divide the pump chamber 44 into two partial areas due to their tooth engagement, of which a first partial area forms a suction chamber 58 and a second partial area forms a pressure chamber 60. The suction space 58 is via one each between the tooth grooves and the adjacent wall 40 the pump channel 44 formed delivery channel 62 connected to the pressure chamber 60. The suction chamber 58 and the pressure chamber 60 each have a connection opening in the end wall 15 of the high-pressure pump housing 14 or in the cover part 42, via which the suction chamber 58 with a suction line (not shown) from the fuel reservoir and the pressure chamber 60 via channels (not shown in detail) in the high-pressure pump housing 14 with the Inlet valves 32 of the pump elements 18 of the high pressure pump 10 is connected. The connection opening in the suction space 58 forms one
Einlassöffnung 64 und die Anschlussöffnung in den Druckraum 60 bildet eine Auslassöffnung 66. Beim Betrieb der Niederdruckpumpe 12 wird durch deren Zahnräder 46,48 Kraftstoff durch die Förderkanäle 62 aus dem Ansaugraum 58 in den Druckraum 60 gefördert.Inlet opening 64 and the connection opening into pressure chamber 60 form an outlet opening 66. When the low-pressure pump 12 is operated, fuel is conveyed from the suction chamber 58 into the pressure chamber 60 through the delivery channels 62 by the gearwheels 62.
Die Zahnräder 46,48 sind mit ihrem Aussenumfang mit geringem Abstand zu der Innenseite der Wandung 40 angeordnet, die die Pumpenkammer 44 in radialer Richtung bezüglich der Drehachsen 51,53 der Zahnräder 46,48 begrenzt. Die Zahnräder 46,48 sind in Richtung ihrer Drehachsen 51,53 mit geringem Abstand zwischen der dem Innenraum abgewandten Aussenseite der Stirnwand 15 des Hochdruckpumpengehäuses 14 und der Innenseite des Deckelteils 42 in der Pumpenkammer 44 angeordnet. Die Aussenseite der Stirnwand 15 und die Innenseite des Deckelteils 42 bilden dabei axiale Lagerstellen für die Zahnräder 46,48, an denen die Zahnräder 46,48 mit ihren Stirnseiten zur Anlage kommen können. Die Ebenheit, die Porenklasse und die Oberflächenrauheit der Aussenseite der Stirnwand 15 und der Innenseite des Deckelteils 42 sind dabei genau vorgegeben, um einen sicheren Betrieb und einen guten Wirkungsgrad der Niederdruckpumpe 12 zu erreichen.The gears 46, 48 are arranged with their outer circumference at a short distance from the inside of the wall 40, which delimits the pump chamber 44 in the radial direction with respect to the axes of rotation 51, 53 of the gears 46, 48. The gear wheels 46, 48 are arranged in the direction of their axes of rotation 51, 53 with a small distance between the outside of the end wall 15 of the high-pressure pump housing 14 facing away from the interior and the inside of the cover part 42 in the pump chamber 44. The outside of the end wall 15 and the inside of the cover part 42 form axial bearings for the gears 46, 48, on which the gears 46, 48 can come to rest with their end faces. The flatness, the pore class and the surface roughness of the outside of the end wall 15 and the inside of the cover part 42 are precisely specified in order to achieve safe operation and good efficiency of the low-pressure pump 12.
Das Hochdruckpumpengehäuse 14 mit der einstückig angeformten Wandung 40 ist vorzugsweise aus Grauguss hergestellt. Die Zahnräder 46,48 sind vorzugsweise aus Stahl, beispielsweise Sinterstahl, hergestellt. Das Deckelteil 42 kann aus Aluminium, Stahl oder Grauguss hergestellt sein. In der dem Hochdruckpumpengehäuse 14 abgewandten Stirnseite der Wandung 40 kann eine Ringnut 68 eingebracht sein, in die ein elastisches Dichtelement 70 eingelegt ist, durch das die Pumpenkammer 44 zwischen der Wandung 40 und dem Deckelteil 42 abgedichtet wird. Vorzugsweise ist die Ringnut 68, in die das Dichtelement 70 eingelegt ist, jedoch im Deckelteil 42 ausgebildet, wo diese einfacher herstellbar ist als in der Wandung 40. Eine weitere Abdichtung der Niederdruckpumpe 12 ist nicht erforderlich, da die Wandung 40 einstückig mit dem Hochdruckpumpengehäuse 14 ausgebildet ist und der Durchtritt der Antriebswelle 16 innerhalb der Pumpenkammer 44 erfolgt. The high-pressure pump housing 14 with the integrally molded wall 40 is preferably made of gray cast iron. The Gears 46, 48 are preferably made of steel, for example sintered steel. The cover part 42 can be made of aluminum, steel or cast iron. In the end face of the wall 40 facing away from the high-pressure pump housing 14, an annular groove 68 can be introduced, into which an elastic sealing element 70 is inserted, by means of which the pump chamber 44 is sealed between the wall 40 and the cover part 42. However, the annular groove 68, in which the sealing element 70 is inserted, is formed in the cover part 42, where it is easier to manufacture than in the wall 40. Further sealing of the low-pressure pump 12 is not necessary, since the wall 40 is integral with the high-pressure pump housing 14 is formed and the passage of the drive shaft 16 takes place within the pump chamber 44.

Claims

Ansprüche Expectations
1. Pumpenanordnung mit einer Hochdruckpumpe und einer dieser vorgeschalteten Niederdruckpumpe für eine Kraftstoffeinspritzeinrichtung einer Brennkraftmaschine, mit einem Pumpengehäuse (14) der Hochdruckpumpe (10) , in dem in einem Innenraum wenigstens ein Pumpenelement (18) und eine dieses antreibende Antriebswelle (16) angeordnet sind, wobei die Niederdruckpumpe (12) ein Pumpengehäuse (15,40,42) aufweist, in dem in einer Pumpenkammer (44) wenigstens ein zumindest mittelbar durch die Antriebswelle (16) der1. Pump arrangement with a high-pressure pump and a low-pressure pump connected upstream thereof for a fuel injection device of an internal combustion engine, with a pump housing (14) of the high-pressure pump (10), in which at least one pump element (18) and a drive shaft (16) driving this are arranged in an interior , The low pressure pump (12) having a pump housing (15, 40, 42) in which at least one pump chamber (44) is at least indirectly driven by the drive shaft (16)
Hochdruckpumpe (10) rotierend angetriebenes Förderelement (46,48) angeordnet ist, dadurch gekennzeichnet, dass das Niederduckpumpengehäuse (15,40) zumindest teilweise einstückig am Hochdruckpumpengehäuse (14) ausgebildet ist.High-pressure pump (10) with a rotationally driven conveying element (46, 48) is arranged, characterized in that the low-pressure pump housing (15, 40) is at least partially formed in one piece on the high-pressure pump housing (14).
2. Pumpenanordnung nach Anspruch 1, dadurch gekennzeichnet, dass als Teil des Niederdruckpumpengehäuses an einer dem Innenraum abgewandten Aussenseite einer Wand (15) des Hochdruckpumpengehäuses (14) eine Wandung (40) einstückig angeformt ist, die die Pumpenkammer (44) der2. Pump arrangement according to claim 1, characterized in that as part of the low-pressure pump housing on a side facing away from the interior of a wall (15) of the high-pressure pump housing (14), a wall (40) is integrally formed, which the pump chamber (44)
Niederdruckpumpe (12) in radialer Richtung bezüglich der Drehachse (51,53) des wenigstens einen Förderelements (46,48) der Niederdruckpumpe (12) begrenzt und dass die Aussenseite der Wand (15) des Hochdruckpumpengehäuses (14) die Pumpenkammer (40) der Niederdruckpumpe (12) in Richtung der Drehachse (51,53) des wenigstens einen Förderelements (46,48) der Niederdruckpumpe (12) begrenzt.Low pressure pump (12) in the radial direction with respect to the axis of rotation (51, 53) of the at least one delivery element (46, 48) of the low pressure pump (12) and that the outside of the wall (15) of the high pressure pump housing (14) limits the pump chamber (40) Low-pressure pump (12) in the direction of the axis of rotation (51, 53) of the at least one delivery element (46, 48) of the low-pressure pump (12) is limited.
3. Pumpenanordnung nach Anspruch 2, dadurch gekennzeichnet, dass die Pumpenkammer (44) der Niederdruckpumpe (12) in3. Pump arrangement according to claim 2, characterized in that the pump chamber (44) of the low pressure pump (12) in
Richtung der Drehachse (51,53) des wenigstens einen Förderelements (46,48) auf der der Wand (15) des Hochdruckpumpengehäuses (10) gegenüberliegenden Seite durch ein mit dem Hochdruckpumpengehäuse (14) verbundenes Deckelteil (42) begrenzt wird.Direction of the axis of rotation (51, 53) of the at least one Conveying element (46, 48) on the side opposite the wall (15) of the high pressure pump housing (10) is delimited by a cover part (42) connected to the high pressure pump housing (14).
4. Pumpenanordnung nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass die Antriebswelle (16) der Hochdruckpumpe (10) durch eine Öffnung (54) in der Wand (15) des Hochdruckpumpengehäuses (14) hindurch in die Pumpenkammer (44) der Niederdruckpumpe (12) ragt und zumindest mittelbar mit dem wenigstens einen Förderelement (46) der Niederdruckpumpe (12) drehschlüssig verbunden ist.4. Pump arrangement according to claim 2 or 3, characterized in that the drive shaft (16) of the high pressure pump (10) through an opening (54) in the wall (15) of the high pressure pump housing (14) into the pump chamber (44) of the low pressure pump ( 12) protrudes and is at least indirectly connected to the at least one delivery element (46) of the low pressure pump (12) in a rotationally locking manner.
5. Pumpenanordnung nach einem der Ansprüche 2 bis 4, dadurch gekennzeichnet, dass an der Aussenseite der Wand (15) des5. Pump arrangement according to one of claims 2 to 4, characterized in that on the outside of the wall (15) of the
Hochdruckpumpengehäuses (14) wenigstens ein in die Pumpenkammer (44) ragender Zapfen (50,52) einstückig angeformt ist, auf dem das wenigstens eine Förderelement (46,48) der Hochdruckpumpe (10) drehbar gelagert ist.High-pressure pump housing (14) at least one pin (50, 52) projecting into the pump chamber (44) is integrally formed, on which the at least one delivery element (46, 48) of the high-pressure pump (10) is rotatably mounted.
6. Pumpenanordnung nach Anspruch 4 und 5, dadurch gekennzeichnet, dass die Öffnung (54) , durch die die Antriebswelle (16) der Hochdruckpumpe (10) in die Pumpenkammer (44) ragt, durch den Zapfen (50) verläuft.6. Pump arrangement according to claim 4 and 5, characterized in that the opening (54) through which the drive shaft (16) of the high pressure pump (10) protrudes into the pump chamber (44) through the pin (50).
7. Pumpenanordnung nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass das Hochdruckpumpengehäuse (14] mit dem einstückig angeformten Niederdruckpumpengehäuse7. Pump arrangement according to one of the preceding claims, characterized in that the high-pressure pump housing (14] with the integrally molded low-pressure pump housing
(15,40) aus Grauguss hergestellt ist. (15.40) is made of gray cast iron.
PCT/DE2003/003215 2002-11-25 2003-09-26 Pump assembly comprising a high-pressure pump and a low-pressure pump that is connected upstream of said pump for a fuel injection device of an internal combustion engine WO2004048768A1 (en)

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DE10254840A DE10254840A1 (en) 2002-11-25 2002-11-25 Pump arrangement with a high-pressure pump and a low-pressure pump connected upstream thereof for a fuel injection device of an internal combustion engine

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010012525A1 (en) * 2008-07-29 2010-02-04 Robert Bosch Gmbh Fuel feeding device for an internal combustion engine
US20100183449A1 (en) * 2007-06-14 2010-07-22 Vito Spinelli High-pressure pump for supplying fuel to an internal-combustion engine
ITMI20122039A1 (en) * 2012-11-29 2014-05-30 Bosch Gmbh Robert PUMPING GROUP FOR FUEL SUPPLEMENTATION, PREFERABLY GASOIL, TO AN INTERNAL COMBUSTION ENGINE
ITMI20130239A1 (en) * 2013-02-20 2014-08-21 Bosch Gmbh Robert PUMP ASSEMBLY TO SUPPLY FUEL, PREFERABLY GASOIL, TO AN INTERNAL COMBUSTION ENGINE

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201600128919A1 (en) * 2016-12-20 2018-06-20 Bosch Gmbh Robert PUMPING GROUP FOR FUEL SUPPLEMENTATION, PREFERABLY GASOIL, TO AN INTERNAL COMBUSTION ENGINE
DE102018210006A1 (en) 2018-06-20 2019-12-24 Robert Bosch Gmbh pump assembly

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1186247A (en) * 1957-07-17 1959-08-18 Prec Mecanique Improvements to variable flow piston pumps such as those for fuel injection into engines
US3146716A (en) * 1961-12-26 1964-09-01 Allis Chalmers Mfg Co Fuel supplying mechanism
DE1260867B (en) * 1962-09-10 1968-02-08 Roosa Vernon D Fuel injection pump
US4041921A (en) * 1973-12-13 1977-08-16 Robert Bosch Gmbh Fuel injection pump for internal combustion engines
WO2002084105A1 (en) * 2001-04-18 2002-10-24 Robert Bosch Gmbh High-pressure fuel pump for a fuel system of a direct injection internal combustion engine, fuel system and internal combustion engine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1186247A (en) * 1957-07-17 1959-08-18 Prec Mecanique Improvements to variable flow piston pumps such as those for fuel injection into engines
US3146716A (en) * 1961-12-26 1964-09-01 Allis Chalmers Mfg Co Fuel supplying mechanism
DE1260867B (en) * 1962-09-10 1968-02-08 Roosa Vernon D Fuel injection pump
US4041921A (en) * 1973-12-13 1977-08-16 Robert Bosch Gmbh Fuel injection pump for internal combustion engines
WO2002084105A1 (en) * 2001-04-18 2002-10-24 Robert Bosch Gmbh High-pressure fuel pump for a fuel system of a direct injection internal combustion engine, fuel system and internal combustion engine

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100183449A1 (en) * 2007-06-14 2010-07-22 Vito Spinelli High-pressure pump for supplying fuel to an internal-combustion engine
US8523534B2 (en) 2007-06-14 2013-09-03 Robert Bosch Gmbh High-pressure pump for supplying fuel to an internal-combustion engine
WO2010012525A1 (en) * 2008-07-29 2010-02-04 Robert Bosch Gmbh Fuel feeding device for an internal combustion engine
ITMI20122039A1 (en) * 2012-11-29 2014-05-30 Bosch Gmbh Robert PUMPING GROUP FOR FUEL SUPPLEMENTATION, PREFERABLY GASOIL, TO AN INTERNAL COMBUSTION ENGINE
ITMI20130239A1 (en) * 2013-02-20 2014-08-21 Bosch Gmbh Robert PUMP ASSEMBLY TO SUPPLY FUEL, PREFERABLY GASOIL, TO AN INTERNAL COMBUSTION ENGINE

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