EP3001023B1 - Fuel pump - Google Patents

Fuel pump Download PDF

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Publication number
EP3001023B1
EP3001023B1 EP15186812.2A EP15186812A EP3001023B1 EP 3001023 B1 EP3001023 B1 EP 3001023B1 EP 15186812 A EP15186812 A EP 15186812A EP 3001023 B1 EP3001023 B1 EP 3001023B1
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EP
European Patent Office
Prior art keywords
groove
fuel
pump
outflow
inflow
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Application number
EP15186812.2A
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German (de)
French (fr)
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EP3001023A1 (en
Inventor
Denis Kovalev
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.)
MAN Energy Solutions SE
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MAN Diesel and Turbo SE
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Publication of EP3001023A1 publication Critical patent/EP3001023A1/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M53/00Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/442Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston means preventing fuel leakage around pump plunger, e.g. fluid barriers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0001Fuel-injection apparatus with specially arranged lubricating system, e.g. by fuel oil
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/02Fuel-injection apparatus having means for reducing wear
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/06Fuel-injection apparatus having means for preventing coking, e.g. of fuel injector discharge orifices or valve needles

Definitions

  • the invention relates to a fuel pump, in particular a high-pressure fuel pump of a common rail fuel system, according to the preamble of claim 1.
  • Fuel pumps have a pump cylinder, wherein a pump piston is movably mounted or guided in the pump cylinder.
  • the pump piston is moved in the pump cylinder via one or more cams up and down, which sucked fuel and from the fuel pump consumers, such.
  • B. injectors of a fuel system is supplied.
  • Fuel pumps known from practice have, in the region of the pump cylinder in which the pump piston is movably mounted, one or more leakage grooves in order to remove a fuel leakage occurring between the pump cylinder and the pump piston.
  • the fuel-lubricated and optionally cooled fuel pump is used in a fuel system in which heavy fuel oil is used, by reaction of the lubrication and possibly cooling the fuel pump serving heavy oil with lubricants used in the region of the cam on the pump piston and Form or deposits on the pump cylinder as laking, which reduce the guide clearance between the pump piston and the pump cylinder in a guide region between the pump piston and the pump cylinder. This can ultimately form a piston seizure on the fuel pump, so then the fuel pump can not be operated. Piston eaters can still be caused by impurities in the fuel.
  • From the DE 10 2006 049 759 A1 is a fuel pump with a pump cylinder and a guided in a recess of the pump cylinder pump piston is known, wherein in the region of the pump piston leading recess of the pump cylinder on the one hand an upper Zulaufnut and on the other hand, a lower drain groove for the lubrication and possibly cooling of the fuel pump serving fuel is formed Fuel can be supplied via the upper inlet groove for lubrication and cooling of the pump piston and discharged via the lower drainage groove of the fuel used for lubrication and cooling. It is after the DE 10 2006 049 759 A1 to reduce laking of the pump piston via a introduced into the pump piston cavity by means of the supply via the feed groove and discharged via the drainage fuel from the inside cooled.
  • the present invention is based on the problem of creating a novel fuel pump with reduced risk of piston eaters.
  • a fuel pump according to claim 1 the upper feed groove has a larger radial groove depth in a lower section, in which the or each feed bore opens into the feed groove, than in an upper section thereof. The risk of a seizure can hereby be further reduced.
  • the or each inlet bore leading to the upper feed groove opens flush with the lower edge of the upper feed groove into the upper feed groove.
  • a scraper is received in a groove of the pump cylinder in the recess of the pump cylinder below the lower drain groove, wherein formed between the lower edge of the lower drain groove and an upper edge of the scraper receiving groove another guide web for the pump piston is, whose axial height is smaller than an axial height of the guide web positioned between the drain groove and the upper Zulaufnut.
  • the or each leading to the lower drain groove discharges drain hole, which in particular has a larger flow cross-section than the or each of the upper Zulaufnut leading inlet bore, adjacent to a lower edge of the lower drainage groove, in particular flush with the lower edge of the lower drainage groove, in the lower drainage groove.
  • drain hole which in particular has a larger flow cross-section than the or each of the upper Zulaufnut leading inlet bore, adjacent to a lower edge of the lower drainage groove, in particular flush with the lower edge of the lower drainage groove, in the lower drainage groove.
  • the lower drain groove has an axial groove height which is greater than a piston stroke of the pump piston. The risk of a seizure can hereby be further reduced.
  • the or each guide bar is dimensioned such that one at Verlackungen on the pump piston and / or in laking on the or each guide web forming and dependent on the surface of the or each guide bar adhesive force of the pump piston on or each guide bar is smaller than a restoring force of a drive spring. Even if a laking on the pump piston and / or should be done on the or each guide bar, the operability of the fuel pump is maintained because the adhesive force of the pump piston on the or each small-area guide webs compared to the restoring force of the drive spring is low.
  • the present invention relates to a fuel pump, in particular a high-pressure fuel pump of a common rail fuel system for a heavy oil-powered internal combustion engine, such as a marine diesel engine.
  • Fig. 1 shows a cross section through a fuel pump 10 according to the invention, wherein the fuel pump 10 has a pump cylinder 11 and a movable in a recess 12 of the pump cylinder 11 pump piston 13.
  • the pump piston 13 is in the recess 12 of the pump cylinder 11 movable up and down and back and forth, namely controlled by a cam 14.
  • the cam 14 is also referred to as a drive cam.
  • the movement of the pump piston 13 caused by the cam 14 counteracts a restoring force provided by a return spring 15, also referred to as a drive spring.
  • This drive spring 15 is supported, on the one hand, on the pump cylinder 11 and, on the other hand, on a support element 16 coupled to the pump piston 13.
  • fuel pump 10 is a high-pressure fuel pump of a common rail fuel system, such a high-pressure fuel pump sucks fuel from a low pressure region of the common rail fuel system, compressed and provides a high pressure region of the common rail fuel system.
  • the pump piston 13 serves to compress the fuel in the recess 12 of the pump cylinder 11, the fuel compressed in the recess 12 of the pump cylinder 11 via the pump piston 13 via a high-pressure bore 17 in the pump cylinder 11 in the direction of the high-pressure region of the common-rail fuel system can be promoted.
  • Such a fuel pump 10 is lubricated with fuel and optionally cooled, so that accordingly serves for lubrication and possibly cooling of the pump piston 13 which is movably guided in the recess 12 of the pump cylinder 11, fuel.
  • a reduced guide clearance can lead to a piston seizure of the pump piston 13. Piston eaters can still be caused by impurities in the fuel.
  • the present invention now relates to details of the fuel pump 10, by means of which the risk of a piston seizure of the pump piston 13 can be reduced.
  • an upper Zulaufnut 18 and a lower drain groove 19 is introduced, wherein the upper Zulaufnut 18 is coupled via at least one inlet bore 20 to a first pressure level, and wherein the lower drain hole 19 is coupled via at least one drain hole 21 to a second pressure level.
  • the first pressure level is the pressure level prevailing in a low pressure region of the common rail fuel system.
  • the second pressure level is then preferably ambient pressure.
  • the pressure level of the low pressure area is set by a low pressure fuel pump and is larger than the ambient pressure.
  • a guide web 24 is formed for the pump piston 13.
  • the or each leading to the upper Zulaufnut 18 inlet bore 20 opens adjacent to the lower edge 22 of the upper Zulaufnut 18 in the same. In this way it can be ensured that for the lubrication and optionally cooling of the pump piston 13 introduced via the or each inlet bore 20 in the Zulaufnut 18 fuel introduced via the positioned between the upper Zulaufnut 18 and the lower drain groove 19 guide web 24 flows and prevents so that in Region of the guide web 24 either foreign particles of the fuel, which serves the lubrication and possibly cooling of the pump piston 13, or can deposit deposits in the region of the guide web 24. As a result, the risk of a piston seizure for the pump piston 13 is reduced.
  • the or each leading to the upper Zulaufnut 18 inlet bore 20 opens flush with the lower edge 22 of the upper Zulaufnut 18 in the upper Zulaufnut 18.
  • This is particularly preferred to over the guide web 24, between the upper Zulaufnut 18 and the lower drain groove 19 is designed to always ensure a sufficient flow of fuel so as to avoid the formation of a laking and / or the setting of foreign particles contained in the fuel in the region of this guide web 24.
  • a groove 25 is formed below the lower drain groove 19, in which a stripping element 26 is received.
  • a further guide web 29 is formed, whose axial height C2 is preferably smaller than the axial height C1 of between the lower drain groove 19 and the upper Zulaufnut 18 positioned guide bar 24.
  • the or each leading to the lower drain groove 19 drain hole 21 preferably opens adjacent to the lower edge 27 of the lower drain groove 19 in the same, preferably such that the or each of the lower drain groove 19 leading drain hole 21 flush with the lower edge 27 of the lower drain groove 19 opens into the same and / or partially sunk in the guide web 29 positioned between the lower drain groove 19 and the groove 25 receiving the wiper element 26.
  • the drain hole 21 is partially sunk in the guide bar 29.
  • the or each leading to the lower drain groove 19 drain hole 21 also has a larger flow area than the or each leading to the upper Zulaufnut 18 inlet bore 20.
  • Contaminants in the fuel can be discharged from the drain piston 19 defined by the pump piston 13.
  • the upper Zulaufnut 18 has a stepped contour.
  • a lower portion 30 of the upper Zulaufnut 18 the same is characterized by a larger radial groove depth than in an upper portion 31 thereof.
  • the or each feed hole 20 opens.
  • the axial groove height of the lower portion 30 of Zulaufnut 18 is less than the axial groove height of the upper portion 31 of the inlet groove 18th
  • the upper Zulaufnut 18 has a total of an axial groove height B, on the one hand greater than a conditional by the cam 14 piston stroke A of the pump piston 13. Due to the fact that the axial groove height B of the upper Zulaufnut 18 is greater than that caused by the cam piston stroke 14 A of the pump piston 13 (B> A), there is no risk that lubricant used in the region of the cam 14 and due to the Lifting movement of the piston 13 via the scraper element 26 possibly reaches the region of the upper Zulaufnut 18, passes into a portion of the recess 12 of the pump cylinder 11, which is positioned above the upper inlet groove 18. As a result, the risk of a piston seizure for the pump piston 13 can be further reduced.
  • Fig. 1 corresponds to the axial groove height D of the lower drain groove 19 in about the flow cross section of the or each leading to the lower drain groove 19 drainage bore 21.
  • the lower drain groove 19 may also have a much greater axial groove height D, which is then greater than the piston stroke A caused by the cam 14 of the pump piston 13. Then, when D> A, the risk of damaging the scraper element 26 and, ultimately, the risk of a piston seizure for the pump piston 13 can be further reduced.
  • the invention may find use in any form of fuel lubricated fuel pumps.
  • the invention finds use in a high pressure fuel pump of a common rail fuel system in which heavy fuel oil is used.
  • Both guide webs 24, 29 have a relatively short axial length.
  • the area of the guide webs 24, 29 is preferably dimensioned such that an adhesive force of the pump piston 13 which is dependent on the surface of the guide webs 24, 29 during laking on the pump piston 13 and / or on the guide webs 24, 29 is smaller than it the restoring force of the drive spring 15.
  • the sum of C1 and C2 ie the sum of the axial heights of the guide webs 24 and 29, is significantly smaller than the piston stroke A of the pump piston 13 caused by the cam 14.
  • the pump piston 13 remains at laking on the pump piston 13 and / or laking at the guide webs 24 and 29 stuck.
  • This can alternatively be used to avoid damage to other components of the internal combustion engine, which can be caused by an uneven delivery or pumping power of the fuel pump 10.

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

Description

Die Erfindung betrifft eine Kraftstoffpumpe, insbesondere eine Hochdruckkraftstoffpumpe eines Common-Rail-Kraftstoffsystems, nach dem Oberbegriff des Anspruchs 1.The invention relates to a fuel pump, in particular a high-pressure fuel pump of a common rail fuel system, according to the preamble of claim 1.

Kraftstoffpumpen verfügen über einen Pumpenzylinder, wobei im Pumpenzylinder ein Pumpenkolben bewegbar gelagert bzw. geführt ist. Der Pumpenkolben wird im Pumpenzylinder über einen oder mehrere Nocken auf und ab bewegt, wodurch Kraftstoff angesaugt und von der Kraftstoffpumpe Verbrauchern, so z. B. Einspritzventilen eines Kraftstoffsystems, zugeführt wird.Fuel pumps have a pump cylinder, wherein a pump piston is movably mounted or guided in the pump cylinder. The pump piston is moved in the pump cylinder via one or more cams up and down, which sucked fuel and from the fuel pump consumers, such. B. injectors of a fuel system is supplied.

Aus der Praxis bekannte Kraftstoffpumpen verfügen im Bereich des Pumpenzylinders, in welchem der Pumpenkolben bewegbar gelagert ist, über eine oder mehrere Leckagenuten, um eine zwischen dem Pumpenzylinder und dem Pumpenkolben auftretende Kraftstoffleckage abzuführen. Insbesondere dann, wenn die mit Kraftstoff geschmierte und gegebenenfalls gekühlte Kraftstoffpumpe in einem Kraftstoffsystem Verwendung findet, in welchem als Kraftstoff Schweröl genutzt wird, können sich durch Reaktion des der Schmierung und gegebenenfalls Kühlung der Kraftstoffpumpe dienenden Schweröls mit im Bereich des Nockens verwendeten Schmierstoffen am Pumpenkolben und/oder am Pumpenzylinder als Verlackungen bezeichnete Ablagerungen ausbilden, die in einem Führungsbereich zwischen dem Pumpenkolben und dem Pumpenzylinder das Führungsspiel zwischen dem Pumpenkolben und dem Pumpenzylinder reduzieren. Hierdurch kann sich letztendlich an der Kraftstoffpumpe ein Kolbenfresser ausbilden, sodass dann die Kraftstoffpumpe nicht mehr betrieben werden kann. Kolbenfresser können weiterhin durch Verunreinigungen im Kraftstoff verursacht werden.Fuel pumps known from practice have, in the region of the pump cylinder in which the pump piston is movably mounted, one or more leakage grooves in order to remove a fuel leakage occurring between the pump cylinder and the pump piston. In particular, when the fuel-lubricated and optionally cooled fuel pump is used in a fuel system in which heavy fuel oil is used, by reaction of the lubrication and possibly cooling the fuel pump serving heavy oil with lubricants used in the region of the cam on the pump piston and Form or deposits on the pump cylinder as laking, which reduce the guide clearance between the pump piston and the pump cylinder in a guide region between the pump piston and the pump cylinder. This can ultimately form a piston seizure on the fuel pump, so then the fuel pump can not be operated. Piston eaters can still be caused by impurities in the fuel.

Aus der DE 10 2007 019 909 A1 ist eine Kraftstoffpumpe mit zwei im Bereich des Pumpenzylinders ausgebildeten Leckagenuten bekannt, über die eine zwischen dem Pumpenzylinder und dem Pumpenkolben auftretende Kraftstoffleckage abführbar ist, nämlich entweder in das Kraftstoffsystem und/oder drucklos in einen Leckagerücklauf, wobei zur Reduzierung von Verlackungen am Pumpenkolben und/oder Pumpenzylinder beide Leckagenuten an einem unteren Drittel der den Pumpenkolben aufnehmenden Ausnehmungen des Pumpenzylinders positioniert sind.From the DE 10 2007 019 909 A1 a fuel pump with two formed in the region of the pump cylinder leakage grooves is known, via which a occurring between the pump cylinder and the pump piston fuel leakage is discharged, either in the fuel system and / or without pressure in a leakage return, wherein the reduction of laking on the pump piston and / or Pump cylinder both leakage grooves are positioned on a lower third of the pump piston receiving recesses of the pump cylinder.

Aus der DE 10 2006 049 759 A1 ist eine Kraftstoffpumpe mit einem Pumpenzylinder und einem in einer Ausnehmung des Pumpenzylinders geführten Pumpenkolben bekannt, wobei im Bereich der den Pumpenkolben führenden Ausnehmung des Pumpenzylinders einerseits eine obere Zulaufnut und andererseits eine untere Ablaufnut für der Schmierung und gegebenenfalls Kühlung der Kraftstoffpumpe dienenden Kraftstoff ausgebildet ist, wobei über die obere Zulaufnut zur Schmierung und Kühlung des Pumpenkolbens Kraftstoff zugeführt und über die untere Ablaufnut der zur Schmierung und Kühlung genutzte Kraftstoff abgeführt werden kann. Dabei ist zur nach der DE 10 2006 049 759 A1 zur Reduzierung von Verlackungen der Pumpenkolben über einen in den Pumpenkolben eingebrachten Hohlraum mit Hilfe des über die Zulaufnut zugeführten und über die Ablaufnut abgeführten Kraftstoffs von innen kühlbar.From the DE 10 2006 049 759 A1 is a fuel pump with a pump cylinder and a guided in a recess of the pump cylinder pump piston is known, wherein in the region of the pump piston leading recess of the pump cylinder on the one hand an upper Zulaufnut and on the other hand, a lower drain groove for the lubrication and possibly cooling of the fuel pump serving fuel is formed Fuel can be supplied via the upper inlet groove for lubrication and cooling of the pump piston and discharged via the lower drainage groove of the fuel used for lubrication and cooling. It is after the DE 10 2006 049 759 A1 to reduce laking of the pump piston via a introduced into the pump piston cavity by means of the supply via the feed groove and discharged via the drainage fuel from the inside cooled.

Desweiteren ist bereits aus der EP 2 339 166 A1 eine Kraftstoffpumpe bekannt geworden, bei dieser zwischen einer oberen Kante der unteren Ablaufnut und einer unteren Kante der oberen Zulaufnut ein Führungssteg für den Pumpenkolben ausgebildet ist, wobei die oder jede zu der oberen Zulaufnut führende Zulaufbohrung benachbart zu der unteren Kante der oberen Zulaufnut in die obere Zulaufnut mündet. Dabei sind die Verlackungsgefahr im Bereich des Pumpenkolbens und des Pumpenzylinders sowie die Gefahr eines Kolbenfressers auf Grund von Verunreinigungen im Kraftstoff reduziert.Furthermore, already from the EP 2 339 166 A1 a fuel pump has become known in which between an upper edge of the lower drain groove and a lower edge of the upper Zulaufnut a guide web is formed for the pump piston, wherein the or each leading to the upper Zulaufnut inlet bore adjacent to the lower edge of the upper Zulaufnut in the upper Zulaufnut opens. The risk of laceration in the area of the pump piston and the pump cylinder and the risk of a piston seizure due to impurities in the fuel are reduced.

Obwohl mit den aus dem Stand der Technik bekannten Kraftstoffpumpen bereits im gewissen Umfang die Gefahr eines Kolbenfresser des Pumpenkolbens im Pumpenzylinder reduziert werden kann, besteht Bedarf an einer Kraftstoffpumpe, an welcher eine weiter reduzierte Kolbenfressergefahr für den Pumpenkolben besteht.
Hiervon ausgehend liegt der vorliegenden Erfindung das Problem zugrunde, eine neuartige Kraftstoffpumpe mit reduzierter Kolbenfressergefahr zu schaffen.
Dieses Problem wird durch eine Kraftstoffpumpe nach Anspruch 1 gelöst. Erfindungsgemäß weist die obere Zulaufnut in einem unteren Abschnitt, in welchem die oder jede Zulaufbohrung in die Zulaufnut mündet, eine größere radiale Nuttiefe auf als in einem oberen Abschnitt derselben. Die Gefahr eines Kolbenfressers kann hierdurch weiter reduziert werden.
Vorzugsweise mündet die oder jede zu der oberen Zulaufnut führende Zulaufbohrung bündig zu der unteren Kante der oberen Zulaufnut in die obere Zulaufnut. Hierdurch können die Verlackungsgefahr im Bereich des Pumpenkolbens sowie des Pumpenzylinders und die Gefahr eines Kolbenfressers auf Grund von Verunreinigungen im Kraftstoff weiter reduziert werden.
Nach einer vorteilhaften Weiterbildung der Erfindung ist im Bereich der Ausnehmung des Pumpenzylinders unterhalb der unteren Ablaufnut ein Abstreifelement in einer Nut des Pumpenzylinders aufgenommen, wobei zwischen der unteren Kante der unteren Ablaufnut und einer oberen Kante der das Abstreifelement aufnehmenden Nut ein weiterer Führungssteg für den Pumpenkolben ausgebildet ist, dessen axiale Höhe kleiner ist als eines axiale Höhe des zwischen der Ablaufnut und der oberen Zulaufnut positionierten Führungsstegs. Vorzugsweise mündet die oder jede zu der unteren Ablaufnut führende Ablaufbohrung, die insbesondere einen größeren Strömungsquerschnitt aufweist als die oder jede zu der oberen Zulaufnut führende Zulaufbohrung, benachbart zu einer unteren Kante der unteren Ablaufnut, insbesondere bündig zu der unteren Kante der unteren Ablaufnut, in die untere Ablaufnut. Hierdurch kann einerseits die Verlackungsgefahr im Bereich des Pumpenkolbens sowie des Pumpenzylinders weiter reduziert werden, andererseits können Verunreinigungen im Kraftstoff definiert abgeführt werden. Die Gefahr eines Kolbenfressers wird weiter reduziert.
Although the danger of a piston seizure of the pump piston in the pump cylinder can already be reduced to a certain extent with the fuel pumps known from the prior art, there is a need for a fuel pump which has a further reduced risk of piston seizures for the pump piston.
On this basis, the present invention is based on the problem of creating a novel fuel pump with reduced risk of piston eaters.
This problem is solved by a fuel pump according to claim 1. According to the invention, the upper feed groove has a larger radial groove depth in a lower section, in which the or each feed bore opens into the feed groove, than in an upper section thereof. The risk of a seizure can hereby be further reduced.
Preferably, the or each inlet bore leading to the upper feed groove opens flush with the lower edge of the upper feed groove into the upper feed groove. As a result, the risk of laking in the region of the pump piston and the pump cylinder and the risk of a piston seizure due to impurities in the fuel can be further reduced.
According to an advantageous embodiment of the invention, a scraper is received in a groove of the pump cylinder in the recess of the pump cylinder below the lower drain groove, wherein formed between the lower edge of the lower drain groove and an upper edge of the scraper receiving groove another guide web for the pump piston is, whose axial height is smaller than an axial height of the guide web positioned between the drain groove and the upper Zulaufnut. Preferably, the or each leading to the lower drain groove discharges drain hole, which in particular has a larger flow cross-section than the or each of the upper Zulaufnut leading inlet bore, adjacent to a lower edge of the lower drainage groove, in particular flush with the lower edge of the lower drainage groove, in the lower drainage groove. In this way, on the one hand, the risk of laking in the region of the pump piston and of the pump cylinder can be further reduced; on the other hand, impurities in the fuel can be removed in a defined manner. The danger of a pestiller is further reduced.

Vorzugsweise weist auch die die untere Ablaufnut eine axiale Nuthöhe auf, die größer als ein Kolbenhub des Pumpenkolbens ist. Die Gefahr eines Kolbenfressers kann hierdurch weiter reduziert werden.Preferably, the lower drain groove has an axial groove height which is greater than a piston stroke of the pump piston. The risk of a seizure can hereby be further reduced.

Nach einer vorteilhaften Weiterbildung der Erfindung ist der oder jeder Führungssteg derart bemessen, dass eine sich bei Verlackungen an dem Pumpenkolben und/oder eine sich bei Verlackungen an dem oder jedem Führungssteg ausbildende und von der Fläche des oder jedes Führungsstegs abhängige Haftkraft des Pumpenkolbens an dem oder jedem Führungssteg kleiner ist als eine Rückstellkraft einer Antriebsfeder. Selbst dann, wenn eine Verlackung am Pumpenkolben und/oder an dem oder jedem Führungssteg erfolgen sollte, bleibt die Funktionsfähigkeit der Kraftstoffpumpe aufrechterhalten, da die Haftkraft des Pumpenkolbens an dem oder jedem kleinflächigen Führungsstegen im Vergleich zur Rückstellkraft der Antriebsfeder gering ist.According to an advantageous embodiment of the invention, the or each guide bar is dimensioned such that one at Verlackungen on the pump piston and / or in laking on the or each guide web forming and dependent on the surface of the or each guide bar adhesive force of the pump piston on or each guide bar is smaller than a restoring force of a drive spring. Even if a laking on the pump piston and / or should be done on the or each guide bar, the operability of the fuel pump is maintained because the adhesive force of the pump piston on the or each small-area guide webs compared to the restoring force of the drive spring is low.

Bevorzugte Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen und der nachfolgenden Beschreibung. Ausführungsbeispiele der Erfindung werden, ohne hierauf beschränkt zu sein, an Hand der Zeichnung näher erläutert. Dabei zeigt:

Fig. 1:
einen schematischen Querschnitt durch eine erfindungsgemäße Kraftstoffpumpe.
Preferred embodiments of the invention will become apparent from the dependent claims and the description below. Embodiments of the invention will be described, without being limited thereto, with reference to the drawings. Showing:
Fig. 1:
a schematic cross section through a fuel pump according to the invention.

Die hier vorliegende Erfindung betrifft eine Kraftstoffpumpe, insbesondere eine Hochdruckkraftstoffpumpe eines Common-Rail-Kraftstoffsystems für eine mit Schweröl betriebene Brennkraftmaschine, wie zum Beispiel eine Schiffsdieselbrennkraftmaschine.The present invention relates to a fuel pump, in particular a high-pressure fuel pump of a common rail fuel system for a heavy oil-powered internal combustion engine, such as a marine diesel engine.

Fig. 1 zeigt einen Querschnitt durch eine erfindungsgemäße Kraftstoffpumpe 10, wobei die Kraftstoffpumpe 10 einen Pumpenzylinder 11 und einen in einer Ausnehmung 12 des Pumpenzylinders 11 bewegbar gelagerten Pumpenkolben 13 aufweist. Der Pumpenkolben 13 ist in der Ausnehmung 12 des Pumpenzylinders 11 auf und ab bewegbar bzw. hin und her bewegbar, nämlich gesteuert über eine Nocke 14. Die Nocke 14 wird auch als Antriebsnocke bezeichnet. Der durch die Nocke 14 verursachten Bewegung des Pumpenkolbens 13 wirkt eine Rückstellkraft entgegen, die von einer Rückstellfeder 15, die auch als Antriebsfeder bezeichnet wird, bereitgestellt wird. Diese Antriebsfeder 15 stützt sich einerseits am Pumpenzylinder 11 und andererseits an einem mit dem Pumpenkolben 13 gekoppelten Abstützelement 16 ab. Fig. 1 shows a cross section through a fuel pump 10 according to the invention, wherein the fuel pump 10 has a pump cylinder 11 and a movable in a recess 12 of the pump cylinder 11 pump piston 13. The pump piston 13 is in the recess 12 of the pump cylinder 11 movable up and down and back and forth, namely controlled by a cam 14. The cam 14 is also referred to as a drive cam. The movement of the pump piston 13 caused by the cam 14 counteracts a restoring force provided by a return spring 15, also referred to as a drive spring. This drive spring 15 is supported, on the one hand, on the pump cylinder 11 and, on the other hand, on a support element 16 coupled to the pump piston 13.

Bei der in Fig. 1 gezeigten Kraftstoffpumpe 10 handelt es sich um eine Hochdruckkraftstoffpumpe eines Common-Rail-Kraftstoffsystems, wobei eine derartige Kraftstoffhochdruckpumpe Kraftstoff aus einem Niederdruckbereich des Common-Rail-Kraftstoffsystems ansaugt, verdichtet und einem Hochdruckbereich des Common-Rail-Kraftstoffsystems zur Verfügung stellt. Der Pumpenkolben 13 dient dabei der Verdichtung des Kraftstoffs in der Ausnehmung 12 des Pumpenzylinders 11, wobei der in der Ausnehmung 12 des Pumpenzylinders 11 über den Pumpenkolben 13 verdichtete Kraftstoff über eine Hochdruckbohrung 17 im Pumpenzylinder 11 in Richtung auf den Hochdruckbereich des Common-Rail-Kraftstoffsystems gefördert werden kann. Eine derartige Kraftstoffpumpe 10 wird mit Kraftstoff geschmiert und ggf. gekühlt, sodass demnach zur Schmierung und ggf. Kühlung des Pumpenkolbens 13, der in der Ausnehmung 12 des Pumpenzylinders 11 beweglich geführt ist, Kraftstoff dient.At the in Fig. 1 shown fuel pump 10 is a high-pressure fuel pump of a common rail fuel system, such a high-pressure fuel pump sucks fuel from a low pressure region of the common rail fuel system, compressed and provides a high pressure region of the common rail fuel system. The pump piston 13 serves to compress the fuel in the recess 12 of the pump cylinder 11, the fuel compressed in the recess 12 of the pump cylinder 11 via the pump piston 13 via a high-pressure bore 17 in the pump cylinder 11 in the direction of the high-pressure region of the common-rail fuel system can be promoted. Such a fuel pump 10 is lubricated with fuel and optionally cooled, so that accordingly serves for lubrication and possibly cooling of the pump piston 13 which is movably guided in the recess 12 of the pump cylinder 11, fuel.

Insbesondere dann, wenn die Kraftstoffpumpe 10 als Kraftstoff Schweröl ansaugt und verdichtet, besteht die Gefahr, dass das Schweröl, welches auch zur Schmierung des Pumpenkolbens 13 dient, mit Schmierstoffen, welche im Bereich der Nocke 14 zur Schmierung derselben verwendet werden und welche sich in den Bereich um die Antriebsfeder 15 und damit in den Bereich eines aus dem Pumpenzylinder 11 herausragenden Abschnitts des Pumpenkolbens 13 ausbreiten, reagiert, wobei sich dann Reaktionsprodukte des Kraftstoffs und des im Bereich des Nockens 14 verwendeten Schmierstoffs als sogenannte Verlackungen im Bereich des Pumpenkolbens 13 und/oder in Folge der Hubbewegung des Pumpenkolbens 13 im Bereich der Ausnehmung 12 des Pumpenzylinders 11 ablagern können, die ein Führungsspiel zwischen dem Pumpenkolben 13 und dem Pumpenzylinder 11 reduzieren. Ein reduziertes Führungsspiel kann zu einem Kolbenfresser des Pumpenkolbens 13 führen. Kolbenfresser können weiterhin durch Verunreinigungen im Kraftstoff verursacht werden. Die hier vorliegende Erfindung betrifft nun Details der Kraftstoffpumpe 10, mit Hilfe derer die Gefahr eines Kolbenfressers des Pumpenkolbens 13 reduziert werden kann.In particular, when the fuel pump 10 as a fuel draws and compresses heavy oil, there is a risk that the heavy oil, which also serves to lubricate the pump piston 13, with lubricants which are used in the region of the cam 14 for lubricating the same and which in the Area around the drive spring 15 and thus spread in the region of a protruding from the pump cylinder 11 portion of the pump piston 13, reacts, which then reaction products of the fuel and the lubricant used in the region of the cam 14 as so-called laking in the region of the pump piston 13 and / or as a result of the lifting movement of the pump piston 13 in the region of the recess 12 of the pump cylinder 11 can be deposited, which reduce a guide clearance between the pump piston 13 and the pump cylinder 11. A reduced guide clearance can lead to a piston seizure of the pump piston 13. Piston eaters can still be caused by impurities in the fuel. The present invention now relates to details of the fuel pump 10, by means of which the risk of a piston seizure of the pump piston 13 can be reduced.

In den Pumpenzylinder 11, nämlich im Bereich der Ausnehmung 12 desselben, innerhalb derer der Pumpenkolben 13 geführt ist, ist eine obere Zulaufnut 18 und eine untere Ablaufnut 19 eingebracht, wobei die obere Zulaufnut 18 über mindestens eine Zulaufbohrung 20 an ein erstes Druckniveau gekoppelt ist, und wobei die untere Ablaufbohrung 19 über mindestens eine Ablaufbohrung 21 an ein zweites Druckniveau gekoppelt ist.In the pump cylinder 11, namely in the region of the recess 12 thereof, within which the pump piston 13 is guided, an upper Zulaufnut 18 and a lower drain groove 19 is introduced, wherein the upper Zulaufnut 18 is coupled via at least one inlet bore 20 to a first pressure level, and wherein the lower drain hole 19 is coupled via at least one drain hole 21 to a second pressure level.

In dem Fall, in welchem es sich bei der Kraftstoffpumpe um eine Hochdruckkraftstoffpumpe eines Common-Rail-Kraftstoffsystems handelt, handelt es sich beim ersten Druckniveau um das Druckniveau, welches in einem Niederdruckbereich des Common-Rail-Kraftstoffsystems herrscht. Bei dem zweiten Druckniveau handelt es sich dann vorzugsweise um Umgebungsdruck. Das Druckniveau des Niederdruckbereichs wird über eine Niederdruckkraftstoffpumpe eingestellt uns ist größer als der Umgebungsdruck.In the case where the fuel pump is a high pressure fuel pump of a common rail fuel system, the first pressure level is the pressure level prevailing in a low pressure region of the common rail fuel system. The second pressure level is then preferably ambient pressure. The pressure level of the low pressure area is set by a low pressure fuel pump and is larger than the ambient pressure.

Zwischen einer unteren Kante 22 der oberen Zulaufnut 18 und einer oberen Kante 23 der unteren Ablaufnut 19 ist ein Führungssteg 24 für den Pumpenkolben 13 ausgebildet.Between a lower edge 22 of the upper Zulaufnut 18 and an upper edge 23 of the lower drain groove 19, a guide web 24 is formed for the pump piston 13.

Die oder jede zu der oberen Zulaufnut 18 führende Zulaufbohrung 20 mündet benachbart zu der unteren Kante 22 der oberen Zulaufnut 18 in dieselbe. Hierdurch kann gewährleistet werden, dass zur Schmierung und gegebenfalls Kühlung des Pumpenkolbens 13 über die oder jede Zulaufbohrung 20 in die Zulaufnut 18 eingebrachter Kraftstoff definiert über den zwischen der oberen Zulaufnut 18 und der unteren Ablaufnut 19 positionierten Führungssteg 24 strömt und so verhindert, dass sich im Bereich des Führungsstegs 24 entweder Fremdpartikel des Kraftstoffs, welcher der Schmierung und ggf. Kühlung des Pumpenkolbens 13 dient, oder Verlackungen im Bereich des Führungsstegs 24 ablagern können. Hierdurch wird die Gefahr eines Kolbenfressers für den Pumpenkolben 13 reduziert.The or each leading to the upper Zulaufnut 18 inlet bore 20 opens adjacent to the lower edge 22 of the upper Zulaufnut 18 in the same. In this way it can be ensured that for the lubrication and optionally cooling of the pump piston 13 introduced via the or each inlet bore 20 in the Zulaufnut 18 fuel introduced via the positioned between the upper Zulaufnut 18 and the lower drain groove 19 guide web 24 flows and prevents so that in Region of the guide web 24 either foreign particles of the fuel, which serves the lubrication and possibly cooling of the pump piston 13, or can deposit deposits in the region of the guide web 24. As a result, the risk of a piston seizure for the pump piston 13 is reduced.

Vorzugsweise mündet die oder jede zu der oberen Zulaufnut 18 führende Zulaufbohrung 20 bündig zu der unteren Kante 22 der oberen Zulaufnut 18 in die obere Zulaufnut 18. Dies ist besonders bevorzugt, um über den Führungssteg 24, der zwischen der oberen Zulaufnut 18 und der unteren Ablaufnut 19 ausgebildet ist, stets einen ausreichenden Kraftstoffstrom zu gewährleisten, um so der Ausbildung einer Verlackung und/oder dem Festsetzen von im Kraftstoff enthaltenen Fremdpartikeln im Bereich dieses Führungsstegs 24 zu vermeiden.Preferably, the or each leading to the upper Zulaufnut 18 inlet bore 20 opens flush with the lower edge 22 of the upper Zulaufnut 18 in the upper Zulaufnut 18. This is particularly preferred to over the guide web 24, between the upper Zulaufnut 18 and the lower drain groove 19 is designed to always ensure a sufficient flow of fuel so as to avoid the formation of a laking and / or the setting of foreign particles contained in the fuel in the region of this guide web 24.

Im Bereich der Ausnehmung 12 des Pumpenzylinders 11 ist unterhalb der unteren Ablaufnut 19 eine Nut 25 ausgebildet, in der ein Abstreifelement 26 aufgenommen ist. Zwischen einer unteren Kante 27 der unteren Ablaufnut 19 und einer oberen Kante 28 der das Abstreifelement 26 aufnehmenden Nut 25 ist ein weiterer Führungssteg 29 ausgebildet, dessen axiale Höhe C2 vorzugsweise kleiner ist als die axiale Höhe C1 des zwischen der unteren Ablaufnut 19 und der oberen Zulaufnut 18 positionierten Führungsstegs 24.In the region of the recess 12 of the pump cylinder 11, a groove 25 is formed below the lower drain groove 19, in which a stripping element 26 is received. Between a lower edge 27 of the lower drain groove 19 and an upper edge 28 of the wiper 26 receiving groove 25, a further guide web 29 is formed, whose axial height C2 is preferably smaller than the axial height C1 of between the lower drain groove 19 and the upper Zulaufnut 18 positioned guide bar 24.

Die oder jede zu der unteren Ablaufnut 19 führende Ablaufbohrung 21 mündet vorzugsweise benachbart zu der unteren Kante 27 der unteren Ablaufnut 19 in dieselbe, vorzugsweise derart, dass die oder jede zu der unteren Ablaufnut 19 führende Ablaufbohrung 21 bündig zu der unteren Kante 27 der unteren Ablaufnut 19 in dieselbe mündet und/oder teilweise in dem zwischen der unteren Ablaufnut 19 und der das Abstreifelement 26 aufnehmenden Nut 25 positionierten Führungssteg 29 versenkt ist. In Fig. 1 ist die Ablaufbohrung 21 teilweise in dem Führungssteg 29 versenkt. Hierdurch wird ein optimaler Abtransport des zur Schmierung und gegebenenfalls Kühlung in die Zulaufnut 18 eingebrachten Kraftstoffs, der über den Führungssteg 24 in die untere Ablaufnut 19 strömt, aus der unteren Ablaufnut 19 gewährleistet. Weiterhin wird gewährleistet, dass gegebenenfalls über das Abstreifelement 26 in den Bereich der unteren Ablaufnut 19 eingebrachtes, im Bereich des Nockens 14 verwendetes Schmiermittel, definiert aus der Ablaufnut 19 abgeführt wird, sodass keine Gefahr besteht, dass im Bereich der Nocken 14 verwendetes Schmiermittel mit dem der Schmierung des Pumpenkolbens 13 dienenden Kraftstoffs reagiert und zu Verlackungen im Bereich des unteren Führungsstegs 29 sowie der unteren Ablaufnut 19 führt.The or each leading to the lower drain groove 19 drain hole 21 preferably opens adjacent to the lower edge 27 of the lower drain groove 19 in the same, preferably such that the or each of the lower drain groove 19 leading drain hole 21 flush with the lower edge 27 of the lower drain groove 19 opens into the same and / or partially sunk in the guide web 29 positioned between the lower drain groove 19 and the groove 25 receiving the wiper element 26. In Fig. 1 the drain hole 21 is partially sunk in the guide bar 29. In this way, an optimal removal of the introduced for lubrication and possibly cooling in the Zulaufnut 18 fuel flowing through the guide bar 24 into the lower drain groove 19, guaranteed from the lower drain groove 19. Furthermore, it is ensured that optionally via the scraper element 26 introduced into the region of the lower drain groove 19, used in the region of the cam 14 lubricant, defined from the drainage groove 19 is discharged so that there is no danger that used in the region of the cam 14 lubricant with the the lubrication of the pump piston 13 serving fuel reacts and leads to laking in the region of the lower guide web 29 and the lower drain groove 19.

Vorzugsweise weist die oder jede zu der unteren Ablaufnut 19 führende Ablaufbohrung 21 ferner einen größeren Strömungsquerschnitt aufweist als die oder jede zu der oberen Zulaufnut 18 führende Zulaufbohrung 20 auf. Verunreinigungen im Kraftstoff können so definiert aus der Ablaufnut 19 vom Pumpenkolben 13 abgeführt werden.Preferably, the or each leading to the lower drain groove 19 drain hole 21 also has a larger flow area than the or each leading to the upper Zulaufnut 18 inlet bore 20. Contaminants in the fuel can be discharged from the drain piston 19 defined by the pump piston 13.

Wie Fig. 1 entnommen werden kann, verfügt die obere Zulaufnut 18 über eine abgestufte Kontur. So ist in einem unteren Abschnitt 30 der oberen Zulaufnut 18 dieselbe durch eine größere radiale Nuttiefe gekennzeichnet als in einem oberen Abschnitt 31 derselben. In den unteren Abschnitt 30 der oberen Zulaufnut 18, der über die größere radiale Nuttiefe verfügt als der obere Abschnitt 31 derselben, mündet die oder jede Zulaufbohrung 20. Die axiale Nuthöhe des unteren Abschnitts 30 der Zulaufnut 18 ist geringer als die axiale Nuthöhe des oberen Abschnitts 31 der Zulaufnut 18.As Fig. 1 can be removed, the upper Zulaufnut 18 has a stepped contour. Thus, in a lower portion 30 of the upper Zulaufnut 18 the same is characterized by a larger radial groove depth than in an upper portion 31 thereof. In the lower portion 30 of the upper Zulaufnut 18, which has the larger radial groove depth than the upper portion 31 thereof, the or each feed hole 20 opens. The axial groove height of the lower portion 30 of Zulaufnut 18 is less than the axial groove height of the upper portion 31 of the inlet groove 18th

Vorzugsweise verfügt die obere Zulaufnut 18 insgesamt über eine axiale Nuthöhe B, die einerseits größer als ein durch den Nocken 14 bedingter Kolbenhub A des Pumpenkolbens 13 ist. Bedingt dadurch, dass die axiale Nuthöhe B der oberen Zulaufnut 18 größer als der durch den Nocken 14 bewirkte Kolbenhub A des Pumpenkolbens 13 ist (B>A), besteht keine Gefahr, dass Schmierstoff, der im Bereich des Nockens 14 verwendet wird und infolge der Hubbewegung des Kolbens 13 über das Abstreifelement 26 ggf. in den Bereich der oberen Zulaufnut 18 gelangt, in einen Abschnitt der Ausnehmung 12 des Pumpenzylinders 11 gelangt, der oberhalb der oberen Zulaufnut 18 positioniert ist. Hierdurch kann die Gefahr eines Kolbenfressers für den Pumpenkolben 13 weiter reduziert werden.Preferably, the upper Zulaufnut 18 has a total of an axial groove height B, on the one hand greater than a conditional by the cam 14 piston stroke A of the pump piston 13. Due to the fact that the axial groove height B of the upper Zulaufnut 18 is greater than that caused by the cam piston stroke 14 A of the pump piston 13 (B> A), there is no risk that lubricant used in the region of the cam 14 and due to the Lifting movement of the piston 13 via the scraper element 26 possibly reaches the region of the upper Zulaufnut 18, passes into a portion of the recess 12 of the pump cylinder 11, which is positioned above the upper inlet groove 18. As a result, the risk of a piston seizure for the pump piston 13 can be further reduced.

In Fig. 1 entspricht die axiale Nuthöhe D der unteren Ablaufnut 19 in etwa dem Strömungsquerschnitt der oder jeder zu der unteren Ablaufnut 19 führenden Ablaufbohrung 21. Obwohl in Fig. 1 nicht gezeigt, kann die untere Ablaufnut 19 auch eine deutlich größere axiale Nuthöhe D aufweisen, die dann größer als der durch den Nocken 14 bedingte Kolbenhub A des Pumpenkolbens 13 ist. Dann, wenn D>A ist, kann die Gefahr einer Beschädigung des Abstreifelements 26 und damit letztendlich die Gefahr eines Kolbenfressers für den Pumpenkolben 13 weiter reduziert werden.In Fig. 1 corresponds to the axial groove height D of the lower drain groove 19 in about the flow cross section of the or each leading to the lower drain groove 19 drainage bore 21. Although in Fig. 1 not shown, the lower drain groove 19 may also have a much greater axial groove height D, which is then greater than the piston stroke A caused by the cam 14 of the pump piston 13. Then, when D> A, the risk of damaging the scraper element 26 and, ultimately, the risk of a piston seizure for the pump piston 13 can be further reduced.

Die Erfindung kann bei jeglicher Form von mit Kraftstoff geschmierten Kraftstoffpumpen Verwendung finden. Insbesondere findet die Erfindung Verwendung bei einer Hochdruckkraftstoffpumpe eines Common-Rail-Kraftstoffsystems, bei welchem als Kraftstoff Schweröl verwendet wird.The invention may find use in any form of fuel lubricated fuel pumps. In particular, the invention finds use in a high pressure fuel pump of a common rail fuel system in which heavy fuel oil is used.

Durch die erfindungsgemäße Ausgestaltung der Kraftstoffpumpe 10 kann die Gefahr von Kolbenfressern für den Pumpenkolben 13 der Kraftstoffpumpe 10 reduziert werden.The inventive design of the fuel pump 10, the risk of seizures for the pump piston 13 of the fuel pump 10 can be reduced.

Fremdpartikel im Kraftstoff, der zur Schmierung und ggf. Kühlung über die oder jede Zulaufbohrung 20 der oberen Zulaufnut 18 zugeführt wird, können infolge des Druckunterschieds zwischen der oberen Zulaufnut 18 und der unteren Ablaufnut 19 definiert über den zwischen der Zulaufnut 18 und der Ablaufnut 19 positionierten Führungssteg 24 in den Bereich der unteren Ablaufnut 19 abgeführt werden, um über die oder jede Ablaufbohrung 21 von der Kraftstoffpumpe 10 abgeführt zu werden. Da dieser Führungssteg 24 eine geringe axiale Höhe C1 aufweist, und weiterhin die oder jede Zulaufbohrung 20 vorzugsweise bündig zu der unteren Kante 22 der oberen Zulaufnut 18 in dieselbe mündet, wird über diesen Führungssteg 24 eine ausreichende Kraftstoffströmung gewährleistet. Im Kraftstoff enthaltene Fremdpartikel können sich demnach nicht im Bereich dieses Führungsstegs 24 festsetzen. Ferner können sich in Folge der Kraftstoffströmung keine Verlackungen im Bereich dieses Führungsstegs 24 ausbilden. Weiterhin wird über die ausreichende große Kraftstoffströmung, die über den Führungssteg 24 strömt, verhindert, dass im Bereich des Nockens 14 genutzte Schmierstoffe, die infolge der Hubbewegung des Pumpenkolbens 13 ggf. über das Abstreifelement 26 und den weiteren Führungssteg 29 in die Ablaufnut 19 gelangen können, den Führungssteg 24 passieren und in den Bereich der oberen Zulaufnut 18 gelangen. Sollten dennoch geringfügige Mengen derartigen Schmierstoffs in den Bereich der oberen Zulaufnut 18 gelangen, so wird über die definierte, abgestufte Konturierung der oberen Zulaufnut 18 gewährleistet, dass sich ggf. dort ausbildende Verlackungen das Führungsspiel für den Pumpenkolben 13 im Bereich der oberen Zulaufnut 18 nicht kritisch reduzieren, sodass sich dann infolge solcher Verlackungen kein Kolbenfresser ausbildet.Foreign particles in the fuel, which is supplied for lubrication and possibly cooling via the or each inlet bore 20 of the upper Zulaufnut 18, as defined by the pressure difference between the upper Zulaufnut 18 and the lower drain groove 19 via the between the Zulaufnut 18 and the drain groove 19 positioned Guide web 24 are discharged into the region of the lower drain groove 19 to be discharged via the or each drain hole 21 of the fuel pump 10. Since this guide web 24 has a small axial height C1, and furthermore the or each inlet bore 20 preferably opens flush with the lower edge 22 of the upper Zulaufnut 18 in the same, a sufficient flow of fuel is ensured via this guide web 24. Accordingly, foreign particles contained in the fuel can not settle in the region of this guide web 24. Furthermore, as a result of the fuel flow no laking can form in the region of this guide web 24. Furthermore, the sufficiently large flow of fuel flowing over the guide web 24 prevents lubricants used in the region of the cam 14 from being able to enter the drain groove 19 via the wiping element 26 and the further guide web 29 as a result of the lifting movement of the pump piston 13 , Pass the guide bar 24 and reach the area of the upper Zulaufnut 18. Nevertheless, should minor amounts of such lubricant reach the area of the upper feed groove 18, the defined, graduated contouring of the upper feed groove 18 ensures that any laking that may form there is not critical to the guide play for the pump piston 13 in the region of the upper feed groove 18 reduce, so then formed as a result of such Verlackungen no piston eater.

Beide Führungsstege 24, 29 verfügen über eine relativ kurze axiale Länge. Dadurch, dass beide Führungsstege 24, 29 über eine relativ kurze axiale Länge verfügen, bleibt selbst dann, wenn eine Verlackung am Pumpenkolben 13 und/oder an den Führungsstegen 24, 29 erfolgen sollte, die Funktionsfähigkeit der Kraftstoffpumpe 10 aufrechterhalten, da dann die Haftkraft bzw. Reibkraft des Pumpenkolbens 13 an den kleinflächigen Führungsstegen 24, 29 im Vergleich zur Rückstellkraft der Antriebsfeder 15 gering ist.Both guide webs 24, 29 have a relatively short axial length. The fact that both guide webs 24, 29 have a relatively short axial length, even if a laking on the pump piston 13 and / or on the guide webs 24, 29 should be maintained, the operability of the fuel pump 10 is maintained, since then the adhesive force or Friction force of the pump piston 13 on the small-area guide webs 24, 29 in comparison to the restoring force of the drive spring 15 is low.

Die Fläche der Führungsstege 24, 29 ist demnach vorzugsweise derart bemessen, dass eine sich bei Verlackungen am Pumpenkolben 13 und/oder an den Führungsstegen 24, 29 ausbildende und von der Fläche der Führungsstege 24, 29 abhängige Haftkraft des Pumpenkolbens 13 an denselben kleiner ist als die Rückstellkraft der Antriebsfeder 15. Hierdurch kann ein Notbetrieb der Kraftstoffpumpe 10 aufrechterhalten werden. Hierzu ist vorzugsweise die Summe aus C1 und C2, also die Summe der axialen Höhen der Führungsstege 24 und 29, deutlich kleiner als der durch den Nocken 14 bedingte Kolbenhub A des Pumpenkolbens 13.Accordingly, the area of the guide webs 24, 29 is preferably dimensioned such that an adhesive force of the pump piston 13 which is dependent on the surface of the guide webs 24, 29 during laking on the pump piston 13 and / or on the guide webs 24, 29 is smaller than it the restoring force of the drive spring 15. As a result, an emergency operation of the fuel pump 10 can be maintained. For this purpose, preferably the sum of C1 and C2, ie the sum of the axial heights of the guide webs 24 and 29, is significantly smaller than the piston stroke A of the pump piston 13 caused by the cam 14.

Dann, wenn die Summe aus C1 und C2 in etwa A entspricht, bleibt der Pumpenkolben 13 bei Verlackungen am Pumpenkolben 13 und/oder bei Verlackungen an den Führungsstege 24 und 29 stecken. Dies kann alternativ genutzt werden, um Schäden an anderen Baugruppen der Brennkraftmaschine, die durch einen ungleichmäßige Förderleistung bzw. Pumpleistung der Kraftstoffpumpe 10 verursacht werden können, zu vermeiden.Then, when the sum of C1 and C2 corresponds approximately to A, the pump piston 13 remains at laking on the pump piston 13 and / or laking at the guide webs 24 and 29 stuck. This can alternatively be used to avoid damage to other components of the internal combustion engine, which can be caused by an uneven delivery or pumping power of the fuel pump 10.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

1010
KraftstoffpumpeFuel pump
1111
Pumpenzylinderpump cylinder
1212
Ausnehmungrecess
1313
Pumpenkolbenpump pistons
1414
Antriebsnockedrive cam
1515
Antriebsfederdriving spring
1616
Abstützelementsupporting
1717
HockdruckbohrungHigh pressure drilling
1818
ZulaufnutZulaufnut
1919
Ablaufnutdrain groove
2020
Zulaufbohrunginlet bore
2121
Ablaufbohrungdrain hole
2222
Kanteedge
2323
Kanteedge
2424
Führungsstegguide web
2525
Nutgroove
2626
Abstreifelementstripping element
2727
Kanteedge
2828
Kanteedge
2929
Führungsstegguide web
3030
Abschnittsection
3131
Abschnittsection

Claims (12)

  1. A fuel pump (10), in particular high-pressure fuel pump of a common-rail fuel system, with a pump plunger (13) guided in a pump cylinder (11), wherein in the region of a recess (12) of the pump cylinder (11), in which the pump plunger (13) is guided, an upper flow groove (18) coupled via at least one inflow bore (20) to a first pressure level and a lower outflow groove (19) coupled via at least one outflow bore (21) to a second pressure level for the fuel serving for the lubrication and if appropriate cooling is formed, wherein between an upper edge (23) of the lower outflow groove (19) and a lower edge (22) of the upper inflow groove (18) a guide land (24) for the pump plunger (13) is formed, wherein the or each inflow bore (2) leading to the upper inflow groove (18) leads into the upper inflow groove (18) adjacently to the lower edge (22) of the upper inflow groove (18), characterized in that the upper inflow groove (18), in a lower section (30), in which the or each inflow bore (20) leads into the inflow groove (18), has a greater radial groove depth than in an upper section (31) of the same, wherein the lower outflow groove (19) lie nearer a cam (14) driving the pump plunger (13) than the upper inflow groove (18).
  2. The fuel pump according to Claim 1, characterized in that the or each inflow bore (20) leading to the upper inflow groove (18) leads into the upper inflow groove (18) flush with the lower edge (22) of the same.
  3. The fuel pump according to Claim 1 or 2, characterized in that in the region of the recess (12) of the pump cylinder (11) below the lower outflow groove (19) a scraper element (26) is received in a groove (25) of the pump cylinder (11), wherein between a lower edge (27) of the lower outflow groove (19) and an upper edge (29) of the groove (25) receiving the scraper element (26), a further guide land (29) for the pump plunger (14) is formed, the axial height (C2) of which is smaller than an axial height (C1) of the upper guide land (24) positioned between the outflow groove (19) and the upper inflow groove (18) .
  4. The fuel pump according to any one of the Claims 1 to 3, characterized in that the or each outflow bore (21) leading to the lower outflow groove (19) has a larger flow cross section than the or each inflow bore (20) leading to the upper inflow groove (18).
  5. The fuel pump according to any one of the Claims 1 to 4, characterized in that the or each outflow bore (21) leading to the lower outflow groove (19) leads into the lower outflow groove (19) adjacently to a lower edge (27) of the lower outflow groove (19).
  6. The fuel pump according to any one of the Claims 1 to 5, characterized in that the or each outflow bore (21) leading to the lower outflow groove (19) leads into the lower outflow groove (19) flush with the lower edge (17) of the lower outflow groove (19).
  7. The fuel pump according to Claim 3, characterized in that the or each outflow bore (21) leading to the lower outflow groove (19) runs at least in the guide land (29) positioned between the lower outflow groove (19) and the groove (25) receiving the scraper element (26) .
  8. The fuel pump according to any one of the Claims 1 to 7, characterized in that the upper inflow groove (18) has an axial groove height (B) which is greater than a plunger stroke (A) of the pump plunger (13).
  9. The fuel pump according to any one of the Claims 1 to 8, characterized in that the lower outflow groove (19) has an axial groove height (D) which is greater than a plunger stroke (A) of the pump plunger (13).
  10. The fuel pump according to any one of the Claims 1 to 9, characterized in that the inflow groove (18) is connected via the or each inflow bore to a low pressure region of the common-rail fuel system.
  11. The fuel pump according to any one of the Claims 1 to 10, characterized in that the outflow groove (19) is connected via the or each outflow bore (21) to a region of the common-rail fuel system, in which ambient pressure is present.
  12. The fuel pump according to any one of the Claims 1 to 11, characterized in that the or each guide land (24, 29) is dimensioned in such a manner that an adhesion force of the pump plunger (13) on the or each guide land which forms during gumming-up and is dependent on the area of the or each guide land (24, 29) is smaller than a resetting force of a driving spring (15).
EP15186812.2A 2014-09-27 2015-09-25 Fuel pump Active EP3001023B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102014014344.9A DE102014014344A1 (en) 2014-09-27 2014-09-27 Fuel pump

Publications (2)

Publication Number Publication Date
EP3001023A1 EP3001023A1 (en) 2016-03-30
EP3001023B1 true EP3001023B1 (en) 2018-08-29

Family

ID=54249318

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15186812.2A Active EP3001023B1 (en) 2014-09-27 2015-09-25 Fuel pump

Country Status (5)

Country Link
EP (1) EP3001023B1 (en)
JP (1) JP6552932B2 (en)
KR (1) KR102244311B1 (en)
CN (1) CN105464870B (en)
DE (1) DE102014014344A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019116353B4 (en) * 2019-06-17 2020-12-24 Man Energy Solutions Se Fuel pump
GB2610401B (en) * 2021-09-02 2023-12-06 Delphi Tech Ip Ltd Pump assembly for a fuel pump
CN114278475B (en) * 2022-01-07 2023-12-01 龙口龙泵柴油喷射高科有限公司 Pump rail integrated electric control common rail high-pressure oil supply system assembly

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4030951B4 (en) * 1990-09-29 2004-03-18 Robert Bosch Gmbh Heavy oil fuel injector for injection internal combustion engines
FI89972C (en) * 1991-03-05 1993-12-10 Waertsilae Diesel Int Arrangement for lubrication of the piston member at a fuel injection pump p
DE19522306B4 (en) * 1994-06-24 2004-08-26 Denso Corp., Kariya High-pressure fuel supply pump
DE19527719A1 (en) * 1995-07-31 1997-02-06 Woodward Governor Germany Gmbh Fuel injection system
JP3815324B2 (en) * 2001-12-28 2006-08-30 日産自動車株式会社 Fuel pressurizing pump for internal combustion engines
JP4010175B2 (en) * 2002-04-19 2007-11-21 日産自動車株式会社 Internal combustion engine fuel pump
DE102006016702A1 (en) * 2006-04-08 2007-10-18 Man Diesel Se Piston pump for supplying fuel in fuel injection system of internal-combustion engine, has recesses provided in guiding area between pump cylinder and pump piston, where fuel is supplied into recesses in axial direction
DE102006049759B4 (en) 2006-10-21 2018-08-09 Man Diesel & Turbo Se Fuel pump
DE102007019909B4 (en) * 2007-04-27 2019-07-11 Man Energy Solutions Se Fuel pump with leakage grooves
EP2339166A1 (en) * 2009-12-23 2011-06-29 Caterpillar Motoren GmbH & Co. KG Purging method and system with scraper or wiper ring for preventing formation of deposits inside fuel pump
DE102011004186A1 (en) * 2011-02-16 2012-08-16 Robert Bosch Gmbh Fuel injection component has element, which is arranged in bore of guide element, where element has structured surface in area between inlet area and outlet area of bore

Also Published As

Publication number Publication date
KR20160037780A (en) 2016-04-06
JP6552932B2 (en) 2019-07-31
KR102244311B1 (en) 2021-04-26
JP2016070278A (en) 2016-05-09
EP3001023A1 (en) 2016-03-30
DE102014014344A1 (en) 2016-03-31
CN105464870A (en) 2016-04-06
CN105464870B (en) 2019-07-05

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