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EP2697501B1 - High pressure fuel pump for a fuel injection system of an internal combustion engine - Google Patents

High pressure fuel pump for a fuel injection system of an internal combustion engine Download PDF

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Publication number
EP2697501B1
EP2697501B1 EP12706236.2A EP12706236A EP2697501B1 EP 2697501 B1 EP2697501 B1 EP 2697501B1 EP 12706236 A EP12706236 A EP 12706236A EP 2697501 B1 EP2697501 B1 EP 2697501B1
Authority
EP
European Patent Office
Prior art keywords
fuel
pump
pressure
line
pressure 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.)
Active
Application number
EP12706236.2A
Other languages
German (de)
French (fr)
Other versions
EP2697501A1 (en
Inventor
Sascha Ambrock
Andreas Dutt
Dietmar Ottenbacher
Achim Koehler
Friedrich Boecking
Karl-Heinz Traub
Arnold Gente
Frank Zehnder
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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Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2697501A1 publication Critical patent/EP2697501A1/en
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Publication of EP2697501B1 publication Critical patent/EP2697501B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/10—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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • 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
    • F04B1/0404—Details or component parts
    • F04B1/0413—Cams
    • F04B1/0417—Cams consisting of two or more cylindrical elements, e.g. rollers
    • 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
    • F04B1/0404—Details or component parts
    • F04B1/0439—Supporting or guiding means for the pistons
    • 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
    • F04B1/0404—Details or component parts
    • F04B1/0452—Distribution members, e.g. valves

Definitions

  • the present invention relates to a high-pressure fuel pump for a fuel injection system of an internal combustion engine according to the preamble of claim 1.
  • Such a high-pressure fuel pump is from the WO 2005/054675 A1 known.
  • This high-pressure fuel pump has a pump housing with a pump interior, wherein the pump interior is connected to a fuel supply and is fuel-loaded.
  • a pump shaft is rotatably mounted.
  • the high-pressure fuel pump has at least one pump element which is actuated by a roller tappet from the pump shaft.
  • the roller tappet is slidably mounted in a guide to form an upper plunger space.
  • the pump interior is fluidly connected to the upper plunger space.
  • the upper plunger space is connected via a connecting channel with a fuel line causing a fuel flow.
  • the fuel line is a Kraftstoffzutex Kunststoff which is connected to a fuel supply to the pump interior.
  • fuel is supplied into the upper plunger chamber, which flows via the fluid connection of the upper plunger chamber with the pump interior in the pump interior.
  • the fuel in the upper plunger chamber is heated, with the heated fuel flowing out into the pump interior. This leads to an increase in the temperature of the fuel in the pump interior.
  • a high-pressure fuel pump which has a pump housing with a pump interior, wherein the pump interior is connected to a fuel supply and is fuel-loaded.
  • a pump shaft is rotatably mounted.
  • the high-pressure fuel pump has at least one pump element which is actuated by a roller tappet from the pump shaft.
  • the roller tappet is slidably mounted in a guide to form an upper plunger space.
  • the pump interior is with fluidly connected to the upper plunger space.
  • the upper plunger space is connected via a connecting channel with a fuel line causing a fuel flow.
  • the fuel line is a Kraftstoffzutex Kunststoff which is connected to a fuel supply to the pump interior.
  • fuel supply line fuel is supplied into the upper plunger chamber, which flows via the fluid connection of the upper plunger chamber with the pump interior in the pump interior. Also in this high-pressure fuel pump heated fuel flows from the upper plunger chamber into the pump interior, resulting in an increase in the temperature of the fuel inside the pump.
  • a high-pressure fuel pump which has a pump housing with a pump interior, wherein the pump interior is connected to a fuel supply and is fuel-loaded.
  • a pump shaft is rotatably mounted.
  • the high-pressure fuel pump has at least one pump element which is actuated by a roller tappet from the pump shaft.
  • the roller tappet is slidably mounted in a guide to form an upper plunger space.
  • the pump interior is fluidly connected to the upper plunger space.
  • the upper plunger space is connected via a connecting channel with a fuel line causing a fuel flow.
  • the fuel line is a fuel supply, via which fuel is supplied to the upper plunger chamber.
  • the invention is based on the object to provide a high-pressure fuel pump, with which a targeted fuel flow of the at least one upper plunger chamber is ensured without heated fuel is fed into the pump interior.
  • two pump elements are installed, wherein the plunger chambers are interconnected via a connecting channel.
  • this connecting channel opens in a further embodiment of the invention, the fuel line.
  • a throttle is inserted into the fuel line.
  • a valve for example a controlled valve or a check valve, may be inserted into the fuel line. The throttle ensures a precisely metered or adjustable flow through the plunger space.
  • the fuel discharge line is connected to the suction side of the mechanical low-pressure pump and a throttle can be used to set the volume flow in the fuel discharge line.
  • a valve in particular a check valve, may be inserted into the fuel discharge line in order to ensure a sufficient system pressure in the pump interior, in particular at the start of the system.
  • the valve can also be designed so that it also assumes the throttle function.
  • the pump interior is connected with a fuel discharge and further with a fuel supply.
  • the or the plunger chambers can be connected by internal connections in the pump housing with the fuel discharge.
  • the Kraftstoffab2020 technisch as a connection of the plunger chamber or the connecting channel can be easily embedded in the pump housing for connection to the fuel discharge.
  • the throttle for adjusting a flow rate can be represented by, for example, a corresponding bore with a smaller diameter in a portion of the Kraftstoffab Scotlandfeitung.
  • the throttle according to the invention preferably has a flow diameter of 0.1 to 1.5 mm. With a small diameter, correspondingly little fuel is discharged and this throttle has a predominant ventilation function, while with a large throttle diameter of> 0.5 mm, both a ventilation function and an intensive cooling function is ensured.
  • FIG. 1 shows a high-pressure fuel pump, which is used for example in a common rail injection system for a self-igniting internal combustion engine.
  • This high-pressure fuel pump delivers the fuel supplied to a high-pressure accumulator with a pressure of in the range of 1600 bar. From the high-pressure accumulator, the fuel is taken from fuel injectors controlled for injection into associated combustion chambers of the internal combustion engine.
  • the high-pressure fuel pump has a pump housing 1 with a pump interior 2.
  • a pump shaft 3 is rotatably mounted and is driven directly or indirectly by, for example, a camshaft or crankshaft of the internal combustion engine.
  • the pump shaft 3 has two cams, which cooperate with rollers 4 mounted in each case in a tappet body 6 of roller tappets 5.
  • the pump shaft 3 is rotated in the arrow direction and the cams cooperate with the rollers 4, the rotational movement of the pump shaft 3 in a translational up and down movement of the roller tappet 5 to.
  • the roller tappets are slide-mounted on a guide 7, which is part of a pump element 8.
  • an upper tappet space 9 is formed, in which a pump piston 10 cooperating with the roller tappet 5 projects.
  • the pump piston 10 is guided in a pump cylinder and conveys the introduced into a pump cylinder in the pump cylinder and a pump cylinder head pump working chamber via a suction valve via a check valve in a high-pressure accumulator.
  • the upper plunger chambers 9 are connected via fluid connections 11 to the pump interior 2 and in addition via a connecting channel 12, the two plunger chambers 9 of the two pump elements 8 are interconnected.
  • the connecting channel 12 is further connected to a fuel line 13, which, as will be explained in the following figures, is connected to the fuel system of the high-pressure fuel pump.
  • the pump housing 1 has bearings 16a, 16b (housing bearings and flange bearings), both of which are fuel lubricated.
  • the discharged fuel quantity can be conducted into a fuel tank 17 or to the suction side of a low-pressure pump 18.
  • the low-pressure pump 18 conveys the fuel stored in the fuel tank 17 via the fuel supply 14 into the pump interior 2.
  • the low-pressure pump 18 is designed in accordance with FIG FIG. 2 designed as electrically operated low-pressure pump 18 and may be regulated with respect to their flow rate.
  • the pump interior 2 has a connection 19 to a metering unit, which defines the fuel supplied to the pump elements 8 and the pump working spaces.
  • the connection 19 is designed such that in the pump housing 1, an opening is incorporated, in which the metering unit for producing a controlled inner connection between the pump interior 2 and the pump elements 8 is inserted.
  • the pump housing 1 the fuel discharge 15, which is also connected via an overflow valve 20 with a discharge line, which normally opens into the fuel tank 17. About the fuel discharge is introduced into the pump interior and discharged from the metering unit not forwarded and not required for lubrication fuel.
  • the connecting line of the low pressure pump 18 with the fuel supply 14 is in accordance with the non-inventive embodiment FIG. 2 interconnected with a further fuel supply line 21 which is connected to the connecting channel 12 between the two upper plunger chambers 9.
  • a throttle 22 is inserted, which regulates a division of the supplied via the fuel supply line 14 and the connecting channel 12 of the high-pressure fuel pump fuel.
  • the supplied via the connecting channel 12 fuel is introduced through the upper plunger chambers 9 and the fluid connections 11 in the pump interior 2 and thus cools in particular the thermally loaded area of the roller tappet 5 of the high-pressure pump.
  • the high-pressure fuel pump according to an embodiment of the invention according to FIG. 3 connected with a designed as a gear pump low-pressure pump 18, wherein the fuel discharge 15 from the pump interior 2 opens into the suction line 23 to the low-pressure pump 18.
  • the entire amount of fuel supplied to the high-pressure fuel pump is introduced by the low-pressure pump 18 designed as a gear pump via the fuel feed 14 into the pump interior 2. From there, a partial stream of the fuel passes via the fluid connection 11 in the pump elements 8 into the connecting channel 12 and from there into the fuel line formed here as Kraftstoffabtextechnisch 24.
  • the Kraftstoffabloom Gustav 24 is provided according to a portion b with a throttle point or according to the alternative portion a with an inserted valve 25.
  • the valve 25 is tuned so that in particular at the start of the system in the pump interior 2, a sufficiently high pressure for trouble-free fuel supply of the metering unit is constructed.
  • FIG. 4 shows a plan view of the unpopulated pump housing 1 of the high-pressure fuel pump.
  • the pump housing 1 has two recesses 26a, 26b into which the pump elements 8 are inserted. Furthermore, in the pump housing 1, the fuel supply 14 and the fuel discharge 15 are incorporated in the form of adjacent holes. Finally, a receptacle 27 for the metering unit is embedded in the pump housing 1.
  • the upper plunger chambers 9 formed together with the recesses 26a, 26b with installed pump elements 8 are connected to one another via the connecting channel 12.
  • the connecting channel 12 is divided into two mutually angled sub-channels. One of these sub-channels has an extension, which represents the Kraftstoffabloomtechnisch 24, and which opens into the fuel discharge 15.
  • the Kraftstoffab2020 Gustav 24 is formed over a partial length with a smaller diameter, said part length forms the throttle point.
  • This throttle point with a diameter of preferably greater than 0.5 mm and less than 1.5 mm determines the discharged into the fuel discharge 15 amount of fuel.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fuel-Injection Apparatus (AREA)

Description

Die vorliegende Erfindung betrifft eine Kraftstoffhochdruckpumpe für ein Kraftstoffeinspritzsystem einer Brennkraftmaschine gemäß dem Oberbegriff des Anspruchs 1.The present invention relates to a high-pressure fuel pump for a fuel injection system of an internal combustion engine according to the preamble of claim 1.

Stand der TechnikState of the art

Eine derartige Kraftstoffhochdruckpumpe ist aus der WO 2005/054675 A1 bekannt. Diese Kraftstoffhochdruckpumpe weist ein Pumpengehäuse mit einem Pumpeninnenraum auf, wobei der Pumpeninnenraum mit einer Kraftstoffzuführung verschaltet ist und kraftstoffbeaufschlagt ist. Im Pumpengehäuse ist eine Pumpenwelle drehbar gelagert. Die Kraftstoffhochdruckpumpe weist wenigstens ein Pumpenelement auf, das über einen Rollenstößel von der Pumpenwelle betätigt wird. Der Rollenstößel ist in einer Führung unter Bildung eines oberen Stößelraums gleitgelagert. Der Pumpeninnenraum ist mit dem oberen Stößelraum fluidverbunden. Der obere Stößelraum ist über einen Verbindungskanal mit einer einen Kraftstoffdurchsatz bewirkenden Kraftstoffleitung verschaltet. Die Kraftstoffleitung ist dabei eine Kraftstoffzuführleitung, die mit einer Kraftstoffzuführung zum Pumpeninnenraum verbunden ist. Über die Kraftstoffzuführleitung wird in den oberen Stößelraum Kraftstoff zugeführt, der über die Fluidverbindung des oberen Stößelraums mit dem Pumpeninnenraum in den Pumpeninnenraum abströmt. Im Betrieb der Kraftstoffhochdruckpumpe erwärmt sich der Kraftstoff im oberen Stößelraum wobei der erwärmte Kraftstoff in den Pumpeninnenraum abströmt. Dies führt zu einer Erhöhung der Temperatur des Kraftstoffs im Pumpeninnenraum.Such a high-pressure fuel pump is from the WO 2005/054675 A1 known. This high-pressure fuel pump has a pump housing with a pump interior, wherein the pump interior is connected to a fuel supply and is fuel-loaded. In the pump housing, a pump shaft is rotatably mounted. The high-pressure fuel pump has at least one pump element which is actuated by a roller tappet from the pump shaft. The roller tappet is slidably mounted in a guide to form an upper plunger space. The pump interior is fluidly connected to the upper plunger space. The upper plunger space is connected via a connecting channel with a fuel line causing a fuel flow. The fuel line is a Kraftstoffzuführleitung which is connected to a fuel supply to the pump interior. Via the fuel supply line fuel is supplied into the upper plunger chamber, which flows via the fluid connection of the upper plunger chamber with the pump interior in the pump interior. During operation of the high-pressure fuel pump, the fuel in the upper plunger chamber is heated, with the heated fuel flowing out into the pump interior. This leads to an increase in the temperature of the fuel in the pump interior.

Durch die DE 10 2009 003094 A1 ist eine Kraftstoffhochdruckpumpe bekannt, die ein Pumpengehäuse mit einem Pumpeninnenraum aufweist, wobei der Pumpeninnenraum mit einer Kraftstoffzuführung verschaltet ist und kraftstoffbeaufschlagt ist. Im Pumpengehäuse ist eine Pumpenwelle drehbar gelagert. Die Kraftstoffhochdruckpumpe weist wenigstens ein Pumpenelement auf, das über einen Rollenstößel von der Pumpenwelle betätigt wird. Der Rollenstößel ist in einer Führung unter Bildung eines oberen Stößelraums gleitgelagert. Der Pumpeninnenraum ist mit dem oberen Stößelraum fluidverbunden. Der obere Stößelraum ist über einen Verbindungskanal mit einer einen Kraftstoffdurchsatz bewirkenden Kraftstoffleitung verschaltet. Die Kraftstoffleitung ist dabei eine Kraftstoffzuführleitung, die mit einer Kraftstoffzuführung zum Pumpeninnenraum verbunden ist. Über die Kraftstoffzuführleitung wird in den oberen Stößelraum Kraftstoff zugeführt, der über die Fluidverbindung des oberen Stößelraums mit dem Pumpeninnenraum in den Pumpeninnenraum abströmt. Auch bei dieser Kraftstoffhochdruckpumpe strömt erwärmter Kraftstoff aus dem oberen Stößelraum in den Pumpeninnenraum ab, was zu einer Erhöhung der Temperatur des Kraftstoffs im Pumpeninnenraum führt.By the DE 10 2009 003094 A1 a high-pressure fuel pump is known, which has a pump housing with a pump interior, wherein the pump interior is connected to a fuel supply and is fuel-loaded. In the pump housing, a pump shaft is rotatably mounted. The high-pressure fuel pump has at least one pump element which is actuated by a roller tappet from the pump shaft. The roller tappet is slidably mounted in a guide to form an upper plunger space. The pump interior is with fluidly connected to the upper plunger space. The upper plunger space is connected via a connecting channel with a fuel line causing a fuel flow. The fuel line is a Kraftstoffzuführleitung which is connected to a fuel supply to the pump interior. Via the fuel supply line fuel is supplied into the upper plunger chamber, which flows via the fluid connection of the upper plunger chamber with the pump interior in the pump interior. Also in this high-pressure fuel pump heated fuel flows from the upper plunger chamber into the pump interior, resulting in an increase in the temperature of the fuel inside the pump.

Durch die WO 2005/015017 A1 ist eine Kraftstoffhochdruckpumpe bekannt, die ein Pumpengehäuse mit einem Pumpeninnenraum aufweist, wobei der Pumpeninnenraum mit einer Kraftstoffzuführung verschaltet ist und kraftstoffbeaufschlagt ist. Im Pumpengehäuse ist eine Pumpenwelle drehbar gelagert. Die Kraftstoffhochdruckpumpe weist wenigstens ein Pumpenelement auf, das über einen Rollenstößel von der Pumpenwelle betätigt wird. Der Rollenstößel ist in einer Führung unter Bildung eines oberen Stößelraums gleitgelagert. Der Pumpeninnenraum ist mit dem oberen Stößelraum fluidverbunden. Der obere Stößelraum ist über einen Verbindungskanal mit einer einen Kraftstoffdurchsatz bewirkenden Kraftstoffleitung verschaltet. Die Kraftstoffleitung ist dabei eine Kraftstoffzuführleitung, über die Kraftstoff in den oberen Stößelraum zugeführt wird. Aus dem oberen Stößelraum wird Kraftstoff in einen Speicherraum abgeführt, aus dem Kraftstoff zu dem Pumpenelement zugeführt wird. Der Speicherraum ist außerdem mit dem Pumpeninnenraum verbunden. Im Betrieb der Kraftstoffhochdruckpumpe strömt erwärmter Kraftstoff aus dem oberen Stößelraum in den Speicherraum und von diesem zum Pumpenelement und in den Pumpeninnenraum.By the WO 2005/015017 A1 a high-pressure fuel pump is known, which has a pump housing with a pump interior, wherein the pump interior is connected to a fuel supply and is fuel-loaded. In the pump housing, a pump shaft is rotatably mounted. The high-pressure fuel pump has at least one pump element which is actuated by a roller tappet from the pump shaft. The roller tappet is slidably mounted in a guide to form an upper plunger space. The pump interior is fluidly connected to the upper plunger space. The upper plunger space is connected via a connecting channel with a fuel line causing a fuel flow. The fuel line is a fuel supply, via which fuel is supplied to the upper plunger chamber. From the upper plunger chamber fuel is discharged into a storage space, is supplied from the fuel to the pump element. The storage space is also connected to the pump interior. During operation of the high-pressure fuel pump, heated fuel flows from the upper plunger chamber into the storage space and from there to the pump element and into the pump interior.

Der Erfindung liegt die Aufgabe zu Grunde, eine Kraftstoffhochdruckpumpe bereitzustellen, mit der eine gezielte Kraftstoffdurchströmung des zumindest einen oberen Stößelraums gewährleistet ist ohne dass erwärmter Kraftstoff in den Pumpeninnenraum geführt wird.The invention is based on the object to provide a high-pressure fuel pump, with which a targeted fuel flow of the at least one upper plunger chamber is ensured without heated fuel is fed into the pump interior.

Offenbarung der ErfindungDisclosure of the invention Vorteile der ErfindungAdvantages of the invention

Diese Aufgabe wird dadurch gelöst, dass die den Kraftstoffdurchsatz bewirkende Kraftstoffleitung eine Kraftstoffabführleitung ist. In den oberen Stößelraum wird aus dem Pumpeninnenraum Kraftstoff weitergeleitet und von diesem über die Kraftstoffabführleitung abgeführt.This object is achieved in that the fuel flow causing fuel line is a Kraftstoffabführleitung. In the upper plunger chamber fuel is passed from the pump interior and discharged from this via the Kraftstoffabführleitung.

In weiterer Ausgestaltung der Erfindung sind zwei Pumpenelemente verbaut, wobei deren Stößelräume über einen Verbindungskanal miteinander verschaltet sind. In diesen Verbindungskanal mündet in weiterer Ausgestaltung der Erfindung die Kraftstoffleitung ein. Diese Ausgestaltung ist besonders vorteilhaft, weil somit die Kraftstoffleitung einfach in das Pumpengehäuse integriert werden kann. Selbstverständlich kann aber die Kraftstoffleitung auch bei vorhandenem Verbindungskanal in einen oder beide Stößelräume einmünden.In a further embodiment of the invention, two pump elements are installed, wherein the plunger chambers are interconnected via a connecting channel. In this connecting channel opens in a further embodiment of the invention, the fuel line. This embodiment is particularly advantageous because thus the fuel line can be easily integrated into the pump housing. Of course, but can open the fuel line even with existing connection channel in one or both plunger chambers.

In Weiterbildung der Erfindung ist in die Kraftstoffleitung eine Drossel eingesetzt. Alternativ oder zusätzlich kann in weiterer Ausgestaltung der Erfindung in die Kraftstoffleitung ein Ventil, beispielsweise ein gesteuertes Ventil oder ein Rückschlagventil eingesetzt sein. Die Drossel gewährleistet eine genau dosierte bzw. einstellbare Durchströmung des Stößelraums.In a further development of the invention, a throttle is inserted into the fuel line. Alternatively or additionally, in a further embodiment of the invention, a valve, for example a controlled valve or a check valve, may be inserted into the fuel line. The throttle ensures a precisely metered or adjustable flow through the plunger space.

Wird die Kraftstoffhochdruckpumpe von einer Zahnradpumpe als mechanische Niederdruckpumpe mit Kraftstoff versorgt, ist die Kraftstoffabführleitung mit der Saugseite der mechanischen Niederdruckpumpe verschaltet und zur Einstellung des Volumenstroms in der Kraftstoffabführleitung kann eine Drossel eingesetzt sein. Zudem kann ein Ventil, insbesondere ein Rückschlagventil in die Kraftstoffabführleitung eingesetzt sein, um insbesondere beim Start des Systems einen hinreichenden Systemdruck in dem Pumpeninnenraum zu gewährleisten. Das Ventil kann dabei auch so ausgestaltet sein, dass es zusätzlich die Drosselfunktion übernimmt.If the high-pressure fuel pump is supplied with fuel by a gear pump as a mechanical low-pressure pump, the fuel discharge line is connected to the suction side of the mechanical low-pressure pump and a throttle can be used to set the volume flow in the fuel discharge line. In addition, a valve, in particular a check valve, may be inserted into the fuel discharge line in order to ensure a sufficient system pressure in the pump interior, in particular at the start of the system. The valve can also be designed so that it also assumes the throttle function.

In Weiterbildung der Erfindung ist der Pumpeninnenraum mit einer Kraftstoffabführung und weiterhin mit einer Kraftstoffzuführung verschaltet. Dies stellt im Grunde eine konventionelle Ausgestaltung dar, wobei aber bei einer solchen konventionellen Ausgestaltung der oder die Stößelräume durch interne Verbindungen in dem Pumpengehäuse mit der Kraftstoffabführung verschaltet sein können. Insbesondere die Kraftstoffabführleitung als Verbindung des Stößelraums oder des Verbindungskanals kann einfach in das Pumpengehäuse zur Verbindung mit der Kraftstoffabführung eingelassen werden. Dabei kann die Drossel zur Einstellung einer Durchflussmenge durch beispielsweise eine entsprechende Bohrung mit geringerem Durchmesser in einem Teilbereich der Kraftstoffabführfeitung dargestellt sein. Die Drossel weist erfindungsgemäß bevorzugt einen Strömungsdurchmesser von 0,1 bis 1,5 mm auf. Bei einem kleinen Durchmesser wird entsprechend wenig Kraftstoff abgeleitet und diese Drossel hat eine überwiegende Entlüftungsfunktion, während bei einem großen Drosseldurchmesser von >0,5 mm sowohl eine Entlüftungsfunktion als auch eine intensive Kühlfunktion gewährleistet ist.In a further development of the invention, the pump interior is connected with a fuel discharge and further with a fuel supply. This is basically a conventional design, but in such a conventional embodiment, the or the plunger chambers can be connected by internal connections in the pump housing with the fuel discharge. In particular the Kraftstoffabführleitung as a connection of the plunger chamber or the connecting channel can be easily embedded in the pump housing for connection to the fuel discharge. In this case, the throttle for adjusting a flow rate can be represented by, for example, a corresponding bore with a smaller diameter in a portion of the Kraftstoffabführfeitung. The throttle according to the invention preferably has a flow diameter of 0.1 to 1.5 mm. With a small diameter, correspondingly little fuel is discharged and this throttle has a predominant ventilation function, while with a large throttle diameter of> 0.5 mm, both a ventilation function and an intensive cooling function is ensured.

Weitere vorteilhafte Ausgestaltungen der Erfindung sind der Zeichnungsbeschreibung zu entnehmen, in der ein in den Figuren dargestelltes Ausführungsbeispiel der Erfindung näher beschrieben ist.Further advantageous embodiments of the invention are described in the drawings, in which an illustrated in the figures embodiment of the invention is described in detail.

Kurze Beschreibung der ZeichnungenBrief description of the drawings

Es zeigen:

  • Figur 1 eine schematische Schnittdarstellung einer Kraftstoffhochdruckpumpe mit zwei von Rollenstößeln betätigten Pumpenelementen, wobei die beiden oberen Stößelräume über einen mit einer Kraftstoffleitung verschalteten Verbindungskanal verbunden sind,
  • Figur 2 in einer alternativen Darstellung zu Figur 1 eine nicht erfindungsgemäße Ausführung, bei der eine in einen Verbindungskanal einmündende Kraftstoffleitung eine Kraftstoffzuführleitung ist,
  • Figur 3 in einer ähnlichen Darstellung zu Figur 2 eine erfindungsgemäße Ausführung, bei der die Kraftstoffleitung eine Kraftstoffabführleitung ist und
  • Figur 4 eine Darstellung eines ausgeführten Pumpengehäuses mit einem eingelassenen Verbindungskanal sowie einer mit diesem verbundenen weiterführenden Kraftstoffabführleitung mit eingesetzter Drossel, wobei die Kraftstoffabführleitung in eine Kraftstoffabführung einmündet.
Show it:
  • FIG. 1 1 is a schematic sectional view of a high-pressure fuel pump with two pump elements actuated by roller tappets, wherein the two upper tappet spaces are connected via a connection channel which is connected to a fuel line,
  • FIG. 2 in an alternative illustration too FIG. 1 a non-inventive embodiment in which a fuel line opening into a connecting channel is a fuel supply line,
  • FIG. 3 in a similar presentation too FIG. 2 an embodiment of the invention in which the fuel line is a Kraftstoffabführleitung and
  • FIG. 4 an illustration of an executed pump housing with a recessed connecting channel and a connected thereto further Kraftstoffabführleitung with inserted throttle, wherein the Kraftstoffabführleitung opens into a fuel discharge.

Ausführungsform der ErfindungEmbodiment of the invention

Figur 1 zeigt eine Kraftstoffhochdruckpumpe, die beispielsweise in einem Common-Rail-Einspritzsystem für eine selbstzündende Brennkraftmaschine eingesetzt wird. Diese Kraftstoffhochdruckpumpe fördert den zugeführten Kraftstoff in einen Hochdruckspeicher mit einem Druck von im Bereich von 1600 bar. Aus dem Hochdruckspeicher wird der Kraftstoff von Kraftstoffinjektoren zur Einspritzung in zugeordnete Brennräume der Brennkraftmaschine gesteuert entnommen. FIG. 1 shows a high-pressure fuel pump, which is used for example in a common rail injection system for a self-igniting internal combustion engine. This high-pressure fuel pump delivers the fuel supplied to a high-pressure accumulator with a pressure of in the range of 1600 bar. From the high-pressure accumulator, the fuel is taken from fuel injectors controlled for injection into associated combustion chambers of the internal combustion engine.

Die Kraftstoffhochdruckpumpe weist ein Pumpengehäuse 1 mit einem Pumpeninnenraum 2 auf. In dem Pumpengehäuse 1 ist eine Pumpenwelle 3 drehbar gelagert und wird von beispielsweise einer Nockenwelle oder einer Kurbelwelle der Brennkraftmaschine direkt oder indirekt angetrieben. Die Pumpenwelle 3 weist zwei Nocken auf, die mit in jeweils einem Stößelkörper 6 von Rollenstößeln 5 gelagerten Rollen 4 zusammenwirken. Bei Betrieb der Kraftstoffhochdruckpumpe wird die Pumpenwelle 3 in Pfeilrichtung gedreht und die Nocken setzen zusammenwirkend mit den Rollen 4 die Drehbewegung der Pumpenwelle 3 in eine translatorische Auf- und Abbewegung der Rollenstößel 5 um. Die Rollenstößel sind einer Führung 7, die Bestandteil eines Pumpenelements 8 ist, gleitgelagert.The high-pressure fuel pump has a pump housing 1 with a pump interior 2. In the pump housing 1, a pump shaft 3 is rotatably mounted and is driven directly or indirectly by, for example, a camshaft or crankshaft of the internal combustion engine. The pump shaft 3 has two cams, which cooperate with rollers 4 mounted in each case in a tappet body 6 of roller tappets 5. During operation of the high-pressure fuel pump, the pump shaft 3 is rotated in the arrow direction and the cams cooperate with the rollers 4, the rotational movement of the pump shaft 3 in a translational up and down movement of the roller tappet 5 to. The roller tappets are slide-mounted on a guide 7, which is part of a pump element 8.

Oberhalb des Rollenstößels 5 ist ein oberer Stößelraum 9 gebildet, in dem ein mit dem Rollenstößel 5 zusammenwirkender Pumpenkolben 10 hineinragt. Der Pumpenkolben 10 ist in einem Pumpenzylinder geführt und fördert den in einen in dem Pumpenzylinder und einem Pumpenzylinderkopf eingelassenen Pumpenarbeitsraum über ein Saugventil eingebrachten Kraftstoff über ein Rückschlagventil in einen Hochdruckspeicher.Above the roller tappet 5, an upper tappet space 9 is formed, in which a pump piston 10 cooperating with the roller tappet 5 projects. The pump piston 10 is guided in a pump cylinder and conveys the introduced into a pump cylinder in the pump cylinder and a pump cylinder head pump working chamber via a suction valve via a check valve in a high-pressure accumulator.

Die oberen Stößelräume 9 sind über Fluidverbindungen 11 mit dem Pumpeninnenraum 2 verschaltet und zusätzlich über einen Verbindungskanal 12 sind die beiden Stößelräume 9 der beiden Pumpenelemente 8 untereinander verbunden. Der Verbindungskanal 12 ist weiterhin mit einer Kraftstoffleitung 13 verschaltet, die, wie in den nachfolgenden Figuren erläutert wird, mit dem Kraftstoffsystem der Kraftstoffhochdruckpumpe verschaltet ist.The upper plunger chambers 9 are connected via fluid connections 11 to the pump interior 2 and in addition via a connecting channel 12, the two plunger chambers 9 of the two pump elements 8 are interconnected. The connecting channel 12 is further connected to a fuel line 13, which, as will be explained in the following figures, is connected to the fuel system of the high-pressure fuel pump.

In das Pumpengehäuse 1 ist weiterhin eine mit dem Pumpeninnenraum 2 korrespondierende Kraftstoffzuführung 14 und eine Kraftstoffabführung 15 eingelassen.In the pump housing 1, a corresponding with the pump interior 2 fuel supply 14 and a fuel discharge 15 is further admitted.

In der nicht erfindungsgemäßen Darstellung gemäß der Figur 2 ist zusätzlich die Lagerung der Pumpenwelle 3 in dem Pumpengehäuse 1 in schematischer Darstellung dargestellt. Das Pumpengehäuse 1 weist Lager 16a, 16b (Gehäuselager und Flanschlager) auf, die beide kraftstoffgeschmiert sind. Dazu wird ein Teilstrom des in diesem Ausführungsbeispiel durch die Kraftstoffzuführung 14 in den Pumpeninnenraum 2 eingeführten Kraftstoffs zur Schmierung (und Kühlung) durch die Lager 16a, 16b geführt und abgeführt. Die abgeführte Kraftstoffmenge kann in einen Kraftstofftank 17 oder auf die Saugseite einer Niederdruckpumpe 18 geleitet werden. Die Niederdruckpumpe 18 fördert im Übrigen den in dem Kraftstofftank 17 bevorrateten Kraftstoff über die Kraftstoffzuführung 14 in den Pumpeninnenraum 2. Die Niederdruckpumpe 18 ist in der Ausführung gemäß Figur 2 als elektrisch betriebene Niederdruckpumpe 18 ausgeführt und kann bezüglich ihrer Fördermenge geregelt sein.In the non-inventive illustration according to the FIG. 2 In addition, the storage of the pump shaft 3 in the pump housing 1 is shown in a schematic representation. The pump housing 1 has bearings 16a, 16b (housing bearings and flange bearings), both of which are fuel lubricated. For this purpose, a partial flow of the introduced in this embodiment by the fuel supply 14 into the pump interior 2 fuel for lubrication (and cooling) through the bearings 16a, 16b and discharged. The discharged fuel quantity can be conducted into a fuel tank 17 or to the suction side of a low-pressure pump 18. Incidentally, the low-pressure pump 18 conveys the fuel stored in the fuel tank 17 via the fuel supply 14 into the pump interior 2. The low-pressure pump 18 is designed in accordance with FIG FIG. 2 designed as electrically operated low-pressure pump 18 and may be regulated with respect to their flow rate.

Der Pumpeninnenraum 2 weist eine Verbindung 19 zu einer Zumesseinheit auf, die den den Pumpenelementen 8 bzw. den Pumpenarbeitsräumen zugeführten Kraftstoff festlegt. Die Verbindung 19 ist derart ausgeführt, dass in das Pumpengehäuse 1 eine Öffnung eingearbeitet ist, in die die Zumesseinheit zur Herstellung einer gesteuerten inneren Verbindung zwischen dem Pumpeninnenraum 2 und den Pumpenelementen 8 eingelassen ist. Weiterhin weist das Pumpengehäuse 1 die Kraftstoffabführung 15 auf, die über ein Überströmventil 20 ebenfalls mit einer Abführleitung, die normalerweise in dem Kraftstofftank 17 einmündet, verbunden ist. Über die Kraftstoffabführung wird in den Pumpeninnenraum eingebrachter und von der Zumesseinheit nicht weitergeleiteter sowie nicht zur Schmierung benötigter Kraftstoff abgeführt.The pump interior 2 has a connection 19 to a metering unit, which defines the fuel supplied to the pump elements 8 and the pump working spaces. The connection 19 is designed such that in the pump housing 1, an opening is incorporated, in which the metering unit for producing a controlled inner connection between the pump interior 2 and the pump elements 8 is inserted. Furthermore, the pump housing 1, the fuel discharge 15, which is also connected via an overflow valve 20 with a discharge line, which normally opens into the fuel tank 17. About the fuel discharge is introduced into the pump interior and discharged from the metering unit not forwarded and not required for lubrication fuel.

Die Verbindungsleitung der Niederdruckpumpe 18 mit der Kraftstoffzuführung 14 ist in der nicht erfindungsgemäßen Ausführung gemäß Figur 2 mit einer weiterführenden Kraftstoffzuführleitung 21 verschaltet, die mit dem Verbindungskanal 12 zwischen den beiden oberen Stößelräumen 9 verbunden ist. In die Kraftstoffzuführleitung 21 ist eine Drossel 22 eingelassen, die eine Aufteilung der über die Kraftstoffzuführung 14 und den Verbindungskanal 12 der Kraftstoffhochdruckpumpe zugeführten Kraftstoff regelt. Der über den Verbindungskanal 12 zugeführte Kraftstoff wird durch die oberen Stößelräume 9 und die Fluidverbindungen 11 in den Pumpeninnenraum 2 eingeleitet und kühlt so insbesondere den thermisch belasteten Bereich des Rollenstößels 5 der Hochdruckpumpe.The connecting line of the low pressure pump 18 with the fuel supply 14 is in accordance with the non-inventive embodiment FIG. 2 interconnected with a further fuel supply line 21 which is connected to the connecting channel 12 between the two upper plunger chambers 9. In the fuel supply 21, a throttle 22 is inserted, which regulates a division of the supplied via the fuel supply line 14 and the connecting channel 12 of the high-pressure fuel pump fuel. The supplied via the connecting channel 12 fuel is introduced through the upper plunger chambers 9 and the fluid connections 11 in the pump interior 2 and thus cools in particular the thermally loaded area of the roller tappet 5 of the high-pressure pump.

Im Unterschied zur nicht erfindungsgemäßen Ausführung gemäß Figur 2 ist die Kraftstoffhochdruckpumpe in einem erfindungsgemäßen Ausführungsbeispiel gemäß Figur 3 mit einer als Zahnradpumpe ausgebildeten Niederdruckpumpe 18 verschaltet, wobei die Kraftstoffabführung 15 von dem Pumpeninnenraum 2 in die Saugleitung 23 zu der Niederdruckpumpe 18 einmündet. Die gesamte der Kraftstoffhochdruckpumpe zugeführte Kraftstoffmenge wird von der als Zahnradpumpe ausgebildeten Niederdruckpumpe 18 über die Kraftstoffzuführung 14 in den Pumpeninnenraum 2 eingebracht. Von dort gelangt ein Teilstrom des Kraftstoffs über die Fluidverbindung 11 in den Pumpenelementen 8 in den Verbindungskanal 12 und von diesem in die hier als Kraftstoffabführleitung 24 ausgebildete Kraftstoffleitung. Die Kraftstoffabführleitung 24 ist gemäß einem Teilabschnitt b mit einer Drosselstelle oder aber gemäß dem alternativen Teilabschnitt a mit einem eingesetzten Ventil 25 versehen. Das Ventil 25 ist so abgestimmt, dass insbesondere beim Start des Systems in den Pumpeninnenraum 2 ein genügend hoher Druck zur störungsfreien Kraftstoffversorgung der Zumesseinheit aufgebaut wird.In contrast to the non-inventive embodiment according to FIG. 2 is the high-pressure fuel pump according to an embodiment of the invention according to FIG. 3 connected with a designed as a gear pump low-pressure pump 18, wherein the fuel discharge 15 from the pump interior 2 opens into the suction line 23 to the low-pressure pump 18. The entire amount of fuel supplied to the high-pressure fuel pump is introduced by the low-pressure pump 18 designed as a gear pump via the fuel feed 14 into the pump interior 2. From there, a partial stream of the fuel passes via the fluid connection 11 in the pump elements 8 into the connecting channel 12 and from there into the fuel line formed here as Kraftstoffabführleitung 24. The Kraftstoffabführleitung 24 is provided according to a portion b with a throttle point or according to the alternative portion a with an inserted valve 25. The valve 25 is tuned so that in particular at the start of the system in the pump interior 2, a sufficiently high pressure for trouble-free fuel supply of the metering unit is constructed.

Figur 4 zeigt eine Draufsicht auf das unbestückte Pumpengehäuse 1 der Kraftstoffhochdruckpumpe. Das Pumpengehäuse 1 weist zwei Ausnehmungen 26a, 26b auf, in die die Pumpenelemente 8 eingesetzt werden. Weiterhin ist in das Pumpengehäuse 1 die Kraftstoffzuführung 14 und die Kraftstoffabführung 15 in Form von nebeneinanderliegenden Bohrungen eingearbeitet. Schließlich ist in das Pumpengehäuse 1 eine Aufnahme 27 für die Zumesseinheit eingelassen. Die zusammen mit den Ausnehmungen 26a, 26b bei eingebauten Pumpenelementen 8 gebildeten oberen Stößelräume 9 sind über den Verbindungskanal 12 miteinander verbunden. Der Verbindungskanal 12 ist in zwei zueinander abgewinkelte Teilkanäle aufgeteilt. Einer dieser Teilkanäle weist einen Fortsatz auf, der die Kraftstoffabführleitung 24 darstellt, und die in die Kraftstoffabführung 15 einmündet. Die Kraftstoffabführleitung 24 ist über eine Teillänge mit einem geringeren Durchmesser ausgebildet, wobei diese Teillänge die Drosselstelle bildet. Diese Drosselstelle mit einem Durchmesser von bevorzugt größer 0,5 mm und kleiner als 1,5 mm bestimmt die in die Kraftstoffabführung 15 abgeführte Kraftstoffmenge. FIG. 4 shows a plan view of the unpopulated pump housing 1 of the high-pressure fuel pump. The pump housing 1 has two recesses 26a, 26b into which the pump elements 8 are inserted. Furthermore, in the pump housing 1, the fuel supply 14 and the fuel discharge 15 are incorporated in the form of adjacent holes. Finally, a receptacle 27 for the metering unit is embedded in the pump housing 1. The upper plunger chambers 9 formed together with the recesses 26a, 26b with installed pump elements 8 are connected to one another via the connecting channel 12. The connecting channel 12 is divided into two mutually angled sub-channels. One of these sub-channels has an extension, which represents the Kraftstoffabführleitung 24, and which opens into the fuel discharge 15. The Kraftstoffabführleitung 24 is formed over a partial length with a smaller diameter, said part length forms the throttle point. This throttle point with a diameter of preferably greater than 0.5 mm and less than 1.5 mm determines the discharged into the fuel discharge 15 amount of fuel.

Claims (8)

  1. High-pressure fuel pump for a fuel injection system of an internal combustion engine, having a pump housing (1) which has a pump interior chamber (2) which is charged with fuel, and having at least one pump element (8) which is actuated by a pump shaft (3), which is mounted rotatably in the pump housing (1), via a roller tappet (5) which is mounted by means of a plain bearing in a guide so as to form an upper plunger chamber (9), wherein the pump interior chamber (2) is fluidically connected to the plunger chamber (9) via a fluidic connection (11), and wherein the plunger chamber (9) is connected to a fuel line (13) which effects a throughput of fuel, characterized in that the entire fuel quantity fed to the high-pressure fuel pump is introduced into the pump interior chamber (2) via a fuel feed passage (14), in that a partial stream of the fuel passes out of the pump interior chamber (2) via the fluidic connection (11) into the plunger chamber (9), and in that the fuel line (13) which effects the throughput of fuel is a fuel discharge line (24).
  2. High-pressure fuel pump according to Claim 1, characterized in that two pump elements (8) are installed, and in that the upper plunger chambers (9) thereof are connected to one another via a connecting channel (12).
  3. High-pressure fuel pump according to either of the preceding claims, characterized in that the fuel line (13, 24) opens into the connecting channel (12).
  4. High-pressure fuel pump according to any of the preceding claims, characterized in that a throttle (22) is inserted into the fuel line (13, 24).
  5. High-pressure fuel pump according to any of the preceding claims, characterized in that a valve (25) is inserted into the fuel line (13, 24).
  6. High-pressure fuel pump according to any of the preceding claims, characterized in that the pump interior chamber (2) is connected to a fuel discharge passage (15) .
  7. High-pressure fuel pump according to Claim 6, characterized in that the fuel discharge passage (15) from the pump interior chamber (2) is connected to the fuel discharge line (24) of the upper plunger chamber (9) .
  8. High-pressure fuel pump according to Claim 6 or 7, characterized in that the fuel discharge passage (15) and/or the fuel discharge line (24) are/is connected to the suction side of a mechanical low-pressure pump (18).
EP12706236.2A 2011-04-14 2012-02-22 High pressure fuel pump for a fuel injection system of an internal combustion engine Active EP2697501B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201110007352 DE102011007352A1 (en) 2011-04-14 2011-04-14 High-pressure fuel pump for a fuel injection system of an internal combustion engine
PCT/EP2012/053005 WO2012139799A1 (en) 2011-04-14 2012-02-22 High pressure fuel pump for a fuel injection system of an internal combustion engine

Publications (2)

Publication Number Publication Date
EP2697501A1 EP2697501A1 (en) 2014-02-19
EP2697501B1 true EP2697501B1 (en) 2019-05-01

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Application Number Title Priority Date Filing Date
EP12706236.2A Active EP2697501B1 (en) 2011-04-14 2012-02-22 High pressure fuel pump for a fuel injection system of an internal combustion engine

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EP (1) EP2697501B1 (en)
CN (1) CN103459822B (en)
DE (1) DE102011007352A1 (en)
WO (1) WO2012139799A1 (en)

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DE102013212145A1 (en) * 2013-06-25 2015-01-08 Robert Bosch Gmbh pump

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Publication number Priority date Publication date Assignee Title
DE10260775A1 (en) * 2002-12-23 2004-07-01 Daimlerchrysler Ag Fuel supply system for internal combustion engines with direct injection
DE10335603A1 (en) * 2003-08-04 2005-03-03 Robert Bosch Gmbh High-pressure pump for a fuel injection device of an internal combustion engine
DE10356262A1 (en) * 2003-12-03 2005-06-30 Robert Bosch Gmbh Radial piston pump, in particular for fuel injection systems
DE102007038530A1 (en) 2007-08-16 2009-02-19 Robert Bosch Gmbh High-pressure fuel pump for fuel injection system of internal combustion engine, has spring collar whose surface is pressurized with closing pressure, by which valves are closed, before fuel is pressurized with high-pressure by piston
DE102009003094A1 (en) * 2009-05-14 2010-11-18 Robert Bosch Gmbh High-pressure fuel pump

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Also Published As

Publication number Publication date
DE102011007352A1 (en) 2012-10-18
EP2697501A1 (en) 2014-02-19
CN103459822A (en) 2013-12-18
CN103459822B (en) 2016-11-09
WO2012139799A1 (en) 2012-10-18

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