EP2310679B1 - High-pressure fuel pump - Google Patents

High-pressure fuel pump Download PDF

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Publication number
EP2310679B1
EP2310679B1 EP09779639.5A EP09779639A EP2310679B1 EP 2310679 B1 EP2310679 B1 EP 2310679B1 EP 09779639 A EP09779639 A EP 09779639A EP 2310679 B1 EP2310679 B1 EP 2310679B1
Authority
EP
European Patent Office
Prior art keywords
pump
pressure
low
pressure fuel
camshaft
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.)
Not-in-force
Application number
EP09779639.5A
Other languages
German (de)
French (fr)
Other versions
EP2310679A1 (en
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
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2310679A1 publication Critical patent/EP2310679A1/en
Application granted granted Critical
Publication of EP2310679B1 publication Critical patent/EP2310679B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • 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

Definitions

  • the invention relates to a high-pressure fuel pump for operating an internal combustion engine according to the preamble of claim 1.
  • Such a high-pressure fuel pump is through US 2006/201484 A1 known.
  • This high-pressure fuel pump has a pump housing, in which a pump camshaft is mounted, which is connected via a polygonal design with at least two pump pistons, which are displaceably guided in each associated, placed on the pump housing pump cylinder heads.
  • a low pressure unit which receives the low pressure circuit is attached to the pump housing.
  • Connected to the high-pressure fuel pump is an electronic control device which detects how much fuel is being delivered by the high-pressure fuel pump. A change in the amount of fuel delivered by the high-pressure fuel pump is not provided.
  • the high-pressure fuel pump according to the invention with the features of claim 1 has the advantage that a metering of the fuel to be compressed is made possible by the metering unit and that the metering unit is reliably protected in this arrangement from mechanical effects, so that the reliability of the system is increased.
  • a delivery pump is placed on the side facing away from the pump housing side of the low pressure unit.
  • the feed pump is realized in the manner of a gear pump. This type of execution is a compact and reliable solution.
  • the pump housing and / or the pump cylinder heads project beyond the low-pressure unit arranged connections of the low-pressure circuit. This has the advantage that thus connections of the low-pressure circuit through the pump housing and the pump cylinder heads are effectively shielded from mechanical effects.
  • a drive of the feed pump via the pump camshaft This eliminates a separate drive the pump, which further increases the compactness of the system.
  • the production cost of the high-pressure fuel pump can be further minimized.
  • bearings of the pump camshaft are designed in the manner of plain bearings.
  • the sole FIGURE shows a longitudinal section of the high-pressure fuel pump according to the invention, in which a pump camshaft 1 is mounted in a pump housing 3 via slide bearings 2a and 2b.
  • the pump camshaft 1 further has a polygonal training 4, via which it is in contact with two pump pistons 5a and 5b, which are guided displaceably in each case in placed on the pump housing pump cylinder heads 6a and 6b.
  • a rotational movement of the pump camshaft 1 via the polygonal training 4 in each case a translational movement of the pump piston 5a and 5b implemented.
  • a pressure chamber 7a and 7b is arranged, in each of which at a downward movement of the respective pump piston 5a or 5b via an associated suction valve 8a or 8b fuel is sucked and then during an upward movement
  • the respective pump piston 5 a or 5 b is compressed and fed via a respective associated high-pressure valve 9 a or 9 b a high-pressure circuit and thus a - not shown here - high-pressure accumulator.
  • a low pressure unit 10 is attached to the pump housing 3, which receives the low pressure circuit.
  • a metering unit 12 which is only indicated by dashed lines in the view, is integrated into the low-pressure unit 10 on a side facing the pump housing 3. Furthermore, ports 13a and 13b of the low-pressure circuit are surmounted by the pump housing 3 and the pump cylinder heads 6a and 6b, so that these ports 13a and 13b are shielded against mechanical effects.
  • the Pump housing 3 are formed as a standard housing, since different courses of the pressure lines of the low-pressure circuit must be varied only in this low-pressure unit 10.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Reciprocating Pumps (AREA)

Description

Die Erfindung betrifft eine Hochdruckkraftstoffpumpe zum Betrieb einer Brennkraftmaschine nach dem Oberbegriff des Anspruchs 1.The invention relates to a high-pressure fuel pump for operating an internal combustion engine according to the preamble of claim 1.

Eine solche Hochdruckkraftstoffpumpe ist durch die US 2006/201484 A1 bekannt. Diese Hochdruckkraftstoffpumpe weist ein Pumpengehäuse auf, in welchem eine Pumpennockenwelle gelagert ist, die über eine polygone Ausbildung mit mindestens zwei Pumpenkolben, die verschiebbar in jeweils zugeordneten, auf dem Pumpengehäuse aufgesetzten Pumpenzylinderköpfen geführt sind, in Verbindung steht. Es erfolgt eine Umsetzung der rotatorischen Bewegung der Pumpennockenwelle in jeweils translatorische Bewegungen der mindestens zwei Pumpenkolben, um Kraftstoff aus einem Niederdruckkreislauf zu verdichten und zu einem Hochdruckspeicher zu fördern. Eine Niederdruckeinheit, welche den Niederdruckkreislauf aufnimmt, ist an dem Pumpengehäuse befestigt. Mit der Hochdruckkraftstoffpumpe ist eine elektronische Steuereinrichtung verbunden, durch die erfasst wird wie viel Kraftstoff von der Hochdruckkaftstoffpumpe gefördert wird. Eine Veränderung der von der Hochdruckkraftstoffpumpe geförderten Kraftstoffmenge ist nicht vorgesehen.Such a high-pressure fuel pump is through US 2006/201484 A1 known. This high-pressure fuel pump has a pump housing, in which a pump camshaft is mounted, which is connected via a polygonal design with at least two pump pistons, which are displaceably guided in each associated, placed on the pump housing pump cylinder heads. There is an implementation of the rotational movement of the pump camshaft in each case translational movements of the at least two pump pistons to compress fuel from a low pressure circuit and to promote a high-pressure accumulator. A low pressure unit which receives the low pressure circuit is attached to the pump housing. Connected to the high-pressure fuel pump is an electronic control device which detects how much fuel is being delivered by the high-pressure fuel pump. A change in the amount of fuel delivered by the high-pressure fuel pump is not provided.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Hochdruckkraftstoffpumpe mit den Merkmalen des Anspruchs 1 hat demgegenüber den Vorteil, dass durch die Zumesseinheit eine Dosierung des zu verdichtenden Kraftstoffs ermöglicht ist und dass die Zumesseinheit bei dieser Anordnung zuverlässig vor mechanischen Einwirkungen geschützt ist, so dass die Betriebssicherheits des Systems erhöht ist.The high-pressure fuel pump according to the invention with the features of claim 1 has the advantage that a metering of the fuel to be compressed is made possible by the metering unit and that the metering unit is reliably protected in this arrangement from mechanical effects, so that the reliability of the system is increased.

Vorteilhafte Ausgestaltungen und Weiterbildungen der erfindungsgemäßen Hochdruckkraftstoffpumpe sind in den abhängigen Ansprüchen angegeben.Advantageous embodiments and further developments of the high-pressure fuel pump according to the invention are specified in the dependent claims.

Gemäß einer weiteren, vorteilhaften Ausführungsform der Erfindung ist auf der vom Pumpengehäuse abgewandten Seite der Niederdruckeinheit eine Förderpumpe aufgesetzt. Dies hat den Vorteil, dass sich durch die direkte Anordnung einer Förderpumpe in diesem Bereich eine sehr kompakte Ausführung des Systems zur Kraftstoffhochdruckerzeugung realisieren lässt.According to a further advantageous embodiment of the invention, a delivery pump is placed on the side facing away from the pump housing side of the low pressure unit. This has the advantage that can be realized by the direct arrangement of a feed pump in this area a very compact design of the system for high-pressure fuel.

Vorteilhafterweise ist die Förderpumpe nach Art einer Zahnradpumpe realisiert. Diese Art der Ausführung stellt eine kompakte und gleichzeitig zuverlässige Lösung dar.Advantageously, the feed pump is realized in the manner of a gear pump. This type of execution is a compact and reliable solution.

Entsprechend einer vorteilhaften Weiterbildung der Erfindung überragen das Pumpengehäuse und/oder die Pumpenzylinderköpfe an der Niederdruckeinheit angeordnete Anschlüsse des Niederdruckkreislaufs. Dies hat den Vorteil, dass somit auch Anschlüsse des Niederdruckkreislaufs durch das Pumpengehäuse bzw. die Pumpenzylinderköpfe wirksam vor mechanischen Einwirkungen abgeschirmt sind.According to an advantageous development of the invention, the pump housing and / or the pump cylinder heads project beyond the low-pressure unit arranged connections of the low-pressure circuit. This has the advantage that thus connections of the low-pressure circuit through the pump housing and the pump cylinder heads are effectively shielded from mechanical effects.

In Weiterbildung der Erfindung erfolgt ein Antrieb der Förderpumpe über die Pumpennockenwelle. Dadurch kann ein gesonderter Antrieb der Förderpumpe entfallen, was die Kompaktheit des Systems weiter erhöht. Zudem kann der Herstellungsaufwand der Hochdruckkraftstoffpumpe weiter minimiert werden.In a further development of the invention, a drive of the feed pump via the pump camshaft. This eliminates a separate drive the pump, which further increases the compactness of the system. In addition, the production cost of the high-pressure fuel pump can be further minimized.

Gemäß einer weiteren Ausführungsform der Erfindung sind Lagerungen der Pumpennockenwelle nach Art von Gleitlagern ausgeführt. Durch diese Maßnahme lässt sich eine robuste und gleichzeitig einfache Lagerung der Pumpennockenwelle erzielen.According to a further embodiment of the invention bearings of the pump camshaft are designed in the manner of plain bearings. By this measure, a robust and at the same time easy storage of the pump camshaft can be achieved.

Weitere, die Erfindung verbessernde Maßnahmen werden nachstehend gemeinsam mit der Beschreibung einer bevorzugten Ausführungsform der Erfindung anhand der Figur näher dargestellt.Further, measures improving the invention will be described in more detail below together with the description of a preferred embodiment of the invention with reference to FIG.

Ausführungsform der ErfindungEmbodiment of the invention

Die einzige Figur zeigt einen Längsschnitt der erfindungsgemäßen Hochdruckkraftstoffpumpe, bei welcher eine Pumpennockenwelle 1 über Gleitlagerungen 2a und 2b in einem Pumpengehäuse 3 gelagert ist. Die Pumpennockenwelle 1 verfügt des weiteren über eine polygone Ausbildung 4, über welche sie mit zwei Pumpenkolben 5a und 5b in Kontakt steht, die jeweils in auf dem Pumpengehäuse aufgesetzten Pumpenzylinderköpfen 6a und 6b verschiebbar geführt sind. Dabei wird eine rotatorische Bewegung der Pumpennockenwelle 1 über die polygone Ausbildung 4 in jeweils eine translatorische Bewegung der Pumpenkolben 5a und 5b umgesetzt. Oberhalb jedes Pumpenkolbens 5a und 5b und in dem jeweiligen Pumpenzylinderkopf 6a oder 6b ist jeweils ein Druckraum 7a und 7b angeordnet, in welchem jeweils bei einer Abwärtsbewegung des jeweiligen Pumpenkolbens 5a oder 5b über ein zugeordnetes Saugventil 8a oder 8b Kraftstoff gesaugt wird und anschließend bei einer Aufwärtsbewegung des jeweiligen Pumpenkolbens 5a oder 5b verdichtet und über ein jeweils zugeordnetes Hochdruckventil 9a oder 9b einem Hochdruckkreislauf und damit einem - hier nicht dargestellten - Hochdruckspeicher zugeführt wird. Als Besonderheit ist an dem Pumpengehäuse 3 eine Niederdruckeinheit 10 angegliedert, welche den Niederdruckkreislauf aufnimmt. An diese Niederdruckeinheit 10 ist des weiteren auf einer, dem Pumpengehäuse 3 abgewandten Seite eine Zahnradpumpe 11 platziert, welche die Förderpumpe des Niederdruckkreislaufes darstellt. Als weitere Besonderheit ist eine Zumesseinheit 12, welche in der Ansicht nur gestrichelt angedeutet ist, auf einer dem Pumpengehäuse 3 zugewandten Seite in die Niederdruckeinheit 10 integriert. Die Zumesseinheit 12 liegt dabei außerhalb des Pumpengehäuses 3. Ferner werden Anschlüsse 13a und 13b des Niederdruckkreislaufs an der Niederdruckeinheit 10 durch das Pumpengehäuse 3 und die Pumpenzylinderköpfe 6a und 6b überragt, sodass diese Anschlüsse 13a und 13b gegen mechanische Einwirkungen abgeschirmt werden.The sole FIGURE shows a longitudinal section of the high-pressure fuel pump according to the invention, in which a pump camshaft 1 is mounted in a pump housing 3 via slide bearings 2a and 2b. The pump camshaft 1 further has a polygonal training 4, via which it is in contact with two pump pistons 5a and 5b, which are guided displaceably in each case in placed on the pump housing pump cylinder heads 6a and 6b. In this case, a rotational movement of the pump camshaft 1 via the polygonal training 4 in each case a translational movement of the pump piston 5a and 5b implemented. Above each pump piston 5a and 5b and in the respective pump cylinder head 6a or 6b, respectively, a pressure chamber 7a and 7b is arranged, in each of which at a downward movement of the respective pump piston 5a or 5b via an associated suction valve 8a or 8b fuel is sucked and then during an upward movement The respective pump piston 5 a or 5 b is compressed and fed via a respective associated high-pressure valve 9 a or 9 b a high-pressure circuit and thus a - not shown here - high-pressure accumulator. As a special feature, a low pressure unit 10 is attached to the pump housing 3, which receives the low pressure circuit. To this low-pressure unit 10 is further placed on a, the pump housing 3 side facing away from a gear pump 11, which is the delivery pump of the low-pressure circuit. As a further special feature, a metering unit 12, which is only indicated by dashed lines in the view, is integrated into the low-pressure unit 10 on a side facing the pump housing 3. Furthermore, ports 13a and 13b of the low-pressure circuit are surmounted by the pump housing 3 and the pump cylinder heads 6a and 6b, so that these ports 13a and 13b are shielded against mechanical effects.

Durch die Verwendung der Niederdruckeinheit 10 kann das Pumpengehäuse 3 als Standardgehäuse ausgebildet werden, da verschiedenartige Verläufe der Druckleitungen des Niederdruckkreislaufs nur in dieser Niederdruckeinheit 10 variiert werden müssen.By using the low-pressure unit 10, the Pump housing 3 are formed as a standard housing, since different courses of the pressure lines of the low-pressure circuit must be varied only in this low-pressure unit 10.

Claims (7)

  1. High-pressure fuel pump for operating an internal combustion engine having a pump housing (3), in which a pump camshaft (1) is mounted and is connected via a polygonal configuration (4) to at least two pump pistons (5a, 5b) which are guided displaceably in respective associated pump cylinder heads (6a, 6b) which are placed on the pump housing (3), a conversion of the rotational movement of the pump camshaft (1) taking place into respective translational movements of the at least two pump pistons (5a, 5b), in order to compress fuel from a low-pressure circuit and to deliver it to a high-pressure accumulator, a low-pressure unit (10) which receives the low-pressure circuit being fastened to the pump housing (3), characterized in that a metering unit (12) for metering in the fuel to be compressed is integrated into the low-pressure unit (10) so as to lie outside the pump housing (3) on the side which faces the pump housing (3) .
  2. High-pressure fuel pump according to Claim 1, characterized in that a delivery pump is placed on that side of the low-pressure unit (10) which faces away from the pump housing (3).
  3. High-pressure fuel pump according to Claim 2, characterized in that the delivery pump is realised in the manner of a gear pump (11).
  4. High-pressure fuel pump according to one of the preceding claims, characterized in that the pump housing (3) and/or the pump cylinder heads (6a, 6b) protrude/protrudes beyond connectors (13a, 13b) of the low-pressure circuit which are arranged on the low-pressure unit (10).
  5. High-pressure fuel pump according to Claim 2, characterized in that a drive of the delivery pump takes place via the pump camshaft (1).
  6. High-pressure fuel pump according to one of the preceding claims, characterized in that bearing systems of the pump camshaft (1) are configured in the manner of plain bearings (2a, 2b).
  7. Internal combustion engine for driving a motor vehicle, comprising a high-pressure fuel pump according to one of Claims 1 to 6.
EP09779639.5A 2008-08-04 2009-06-05 High-pressure fuel pump Not-in-force EP2310679B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008040966A DE102008040966A1 (en) 2008-08-04 2008-08-04 High pressure fuel pump
PCT/EP2009/056913 WO2010015436A1 (en) 2008-08-04 2009-06-05 High-pressure fuel pump

Publications (2)

Publication Number Publication Date
EP2310679A1 EP2310679A1 (en) 2011-04-20
EP2310679B1 true EP2310679B1 (en) 2018-01-24

Family

ID=41077992

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09779639.5A Not-in-force EP2310679B1 (en) 2008-08-04 2009-06-05 High-pressure fuel pump

Country Status (5)

Country Link
EP (1) EP2310679B1 (en)
CN (1) CN102105688B (en)
DE (1) DE102008040966A1 (en)
RU (1) RU2516081C2 (en)
WO (1) WO2010015436A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112021003235T5 (en) * 2020-08-14 2023-04-27 Cummins Inc. SLIDING CAM LEVER

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2068110C1 (en) * 1992-01-29 1996-10-20 Олег Иванович Савинов Fuel injection system for internal combustion engine
RU2116496C1 (en) * 1994-10-24 1998-07-27 Александр Алексеевич Пустынцев Multifunction pump unit
IT239879Y1 (en) 1996-12-23 2001-03-13 Elasis Sistema Ricerca Fiat REFINEMENTS TO A PISTON PUMP, IN PARTICULAR TO A RADIAL APISTON PUMP FOR THE FUEL OF AN INTERNAL COMBUSTION ENGINE.
DE19736160A1 (en) * 1997-08-20 1999-02-25 Bosch Gmbh Robert High pressure fuel pump for IC engine in common rail systems
DE10228551A1 (en) * 2002-06-26 2004-01-22 Siemens Ag Radial piston pump
DE10337847A1 (en) * 2003-08-18 2005-03-17 Robert Bosch Gmbh Pump arrangement with a high-pressure pump and a low-pressure pump upstream of this for a fuel injection device of an internal combustion engine
US8061328B2 (en) * 2005-03-09 2011-11-22 Caterpillar Inc. High pressure pump and method of reducing fluid mixing within same
JP2007154711A (en) * 2005-12-02 2007-06-21 Denso Corp Fuel injection pump

Also Published As

Publication number Publication date
CN102105688B (en) 2015-11-25
CN102105688A (en) 2011-06-22
EP2310679A1 (en) 2011-04-20
DE102008040966A1 (en) 2010-02-11
WO2010015436A1 (en) 2010-02-11
RU2516081C2 (en) 2014-05-20
RU2011108007A (en) 2012-09-10

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