WO2014135303A1 - Pump, in particular fuel pump - Google Patents

Pump, in particular fuel pump Download PDF

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Publication number
WO2014135303A1
WO2014135303A1 PCT/EP2014/051503 EP2014051503W WO2014135303A1 WO 2014135303 A1 WO2014135303 A1 WO 2014135303A1 EP 2014051503 W EP2014051503 W EP 2014051503W WO 2014135303 A1 WO2014135303 A1 WO 2014135303A1
Authority
WO
WIPO (PCT)
Prior art keywords
pump
seal
ring
cylinder
pump cylinder
Prior art date
Application number
PCT/EP2014/051503
Other languages
German (de)
French (fr)
Inventor
Arnold Gente
Libor Slaby
Tsuyoshi Terasaki
Markus Schetter
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2014135303A1 publication Critical patent/WO2014135303A1/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
    • F02M59/44—Details, 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
    • F02M59/442—Details, 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
    • 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
    • F02M59/025—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 a single piston
    • F02M59/027—Unit-pumps, i.e. single piston and cylinder pump-units, e.g. for cooperating with a camshaft
    • 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
    • F04B1/0448—Sealing means, e.g. for shafts or housings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/053—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with actuating or actuated elements at the inner ends of the cylinders

Definitions

  • the present invention relates to a pump, in particular a fuel pump of an internal combustion engine, comprising a pump cylinder and a pumping ram in the pump cylinder to form a pump working space up and down movable pump plunger, wherein the pump plunger is sealed relative to the pump cylinder on a pump working chamber opposite drive side by means of a seal.
  • Fuel pump has a conventional structure in which a
  • Pump plunger in a pump cylinder is translationally movable up and down. In the region of a drive side of the pump tappet, this is sealed off from the pump cylinder by means of a seal.
  • This seal has a multi-part construction and is composed inter alia of an inner ring and an outer ring. Overall, the structure of this seal is expensive and the attachment to the pump cylinder is complex, so that, among other things, the assembly is associated with relatively high workload.
  • the invention has for its object to provide a pump in which the sealing of a pump plunger against a pump cylinder is improved with little effort over the prior art.
  • a fixing element is provided, which cooperates with the pump cylinder and the seal in the form that the seal is held in a defined position with respect to the pump cylinder.
  • an only integrally formed seal and the fixing element is used, so that in total only two parts must be installed on the pump. This is the construction cost and
  • the pump may be any pump designed to deliver a medium, but is preferably a fuel pump, very preferably a fuel-high-pressure pump for use in a common-rail injection system of an internal combustion engine.
  • the pump is further designed as a so-called plug-in pump directly into a housing, such as a crankcase or a gearbox housing, the
  • the delivery area of the pump is hydraulically separated from the drive area of the pump, since different media are present in these areas.
  • the delivery region of the pump is in contact with fuel, for example diesel fuel, while the drive region, which protrudes into the crankcase of the internal combustion engine, for example, is preferably acted upon by the lubricating oil of the internal combustion engine.
  • the seal fastened according to the invention is provided.
  • the fixing element is a retaining shoulder having a ring.
  • Such a component can be manufactured easily and inexpensively.
  • the ring is a closed ring, which in turn in another embodiment, a continuous engaging in a circumferential annular groove on a mounting shoulder of the pump cylinder mounting lug (or latch).
  • the ring may be an open ring with ring sections, wherein in a further embodiment of the invention the ring sections in an annular groove on an attachment paragraph of the pump cylinder engaging mounting lug portions have.
  • the material of the ring is plastic and / or metal. From both materials, the ring can be produced inexpensively.
  • the pump cylinder on a seal receiving the sealing recess.
  • the seal is held with the fixing element according to the invention below the pump cylinder in a defined position.
  • the seal is inserted in a sealing recess in the pump cylinder, it is ensured that the seal is already arranged without the fixing element in a defined position, whereby, for example, also the assembly is simplified.
  • this ensures that the seal is easily and permanently sealed against the seal recess.
  • the fixing element only ensures that the seal can not migrate out of the seal recess during operation of the corresponding pump, for example caused by the continuous up and down movements of the pump tappet.
  • the seal is a one-piece elastomer seal, which in turn in a further embodiment of the invention has two opposite, facing away from each other V-shaped spring elements.
  • V-shaped spring elements ensure that adjacent, circumferential sealing lips of the elastomeric seal is pressed both against the shaft of the pump plunger and against the wall of the sealing recess.
  • a pump according to the invention in which the sealing of the pump plunger relative to the pump cylinder in a very cost-effective production process and assembly process with only two
  • the fixing element to be processed can be produced in a particularly cost-effective manner, for example as an injection-molded part in a production from plastic.
  • the available space is determined mainly by the inner contour of the housing into which the pump is installed.
  • FIG. 1 a shows a detail enlargement from FIG. 1 in the region of FIG
  • FIG. 1 aa shows a perspective detail view of a fixing element designed as a closed ring
  • FIG. 1 b shows a detail enlargement from FIG. 1 in the region of FIG
  • Figure 1 bb is a detailed perspective view of an open ring
  • the pump 1 illustrated in FIG. 1 is, in particular, a fuel pump, very particularly a high-pressure fuel pump, which is particularly suitable in common rail systems.
  • the pump 1 is made of a
  • Fuel low pressure system fuel supplied which is funded by the pump 1 in a high-pressure accumulator.
  • a high-pressure accumulator (rail) stored there fuel, especially diesel fuel for injection into associated combustion chambers of an internal combustion engine, in particular a self-igniting internal combustion engine, taken from corresponding fuel injectors.
  • the common rail injection system with the pump 1 can be installed in a spark-ignited gasoline-powered internal combustion engine.
  • the pump 1 has an integral with a pump cylinder head. 2
  • the housing 4 may also be an independent housing 4 for the pump 1, which is mounted on the internal combustion engine.
  • a pump plunger 5 is inserted, which is connected to a
  • roller tappet 7 In this case, a biased plunger spring 8, which is supported on a pump cylinder head side paragraph in the pump cylinder 3, opposite a disc 9, which rests on the Pumpenstsammlungelfuß 6, firmly against the roller tappet 7.
  • the roller tappet 7 has a means of a bolt 10 at this insertion a bearing 1 1 fixed roller 12, which rolls on a cam, not shown, of a camshaft.
  • the camshaft is preferably part of the internal combustion engine and may be, for example, a gas exchange camshaft extended by a cam. During a rotational movement of the camshaft, the roller tappet 7 and thus the pump tappet 5 are moved up and down in the pump cylinder 3 in a translatory manner.
  • the pump plunger 5 cooperates with a pump working chamber 13 arranged in the pump cylinder head 2, into which fuel is introduced in a controlled manner via a, for example, electromagnetically actuated intake valve 14, through a supply line 15.
  • a pump working chamber 13 arranged in the pump cylinder head 2
  • fuel is introduced in a controlled manner via a, for example, electromagnetically actuated intake valve 14, through a supply line 15.
  • the thus introduced into the pump working chamber 13 fuel is at a
  • the pump plunger 5 is opposite the pump cylinder 3 by means of a arranged above the pump plunger base 6 seal 18 against the
  • the seal 18 is in a
  • Seal recess 19 which is inserted into the pump cylinder 3, used.
  • the seal recess 19 can above the seal 18 with be connected to a channel through which the leakage fuel is discharged, for example, in the fuel low pressure system.
  • the seal 18 is formed as a one-piece elastomeric seal and held by means of a, for example, made of plastic or metal fixing 20.
  • the fixing element 20 is in the embodiment of Figure 1 and the corresponding
  • FIG. 1 a Sectional enlargement according to Figure 1 a and the perspective view of Figure 1 aa as a closed and a circumferential holding paragraph 21 exhibiting ring 22a formed.
  • the ring 22 a has a circumferential fastening lug 23 a, which in a circumferential annular groove 24 at a
  • Fixing paragraph 25 engages in the pump cylinder 3.
  • Holding shoulder 21 engages under the seal 18 and ensures that it is firmly held in the seal recess 19.
  • the seal 18 has two mutually pioneering, opposite V-shaped spring elements 26a, 26b, which are so taut that corresponding end-side sealing lips of the seal 18 abut the pump plunger 5 and on the wall of the sealing recess 19.
  • the ring sections are preferably in the same

Landscapes

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

Abstract

The invention relates to a pump (1), in particular a fuel pump of an internal combustion engine, having a pump cylinder (3) and a pump plunger (5) that can be moved up and down in the pump cylinder (3) in a translatory manner while forming a pump workroom (13). The pump plunger (5) can be sealed with respect to the pump cylinder (3) by way of a seal (18) at a drive side located opposite the pump workroom (13). According to the invention, a pump (1) is provided, wherein the sealing of the pump plunger (5) with respect to a pump cylinder (3) is improved with little expenditure as compared to conventional solutions. This is achieved by providing a fixing element (20) that interacts with the pump cylinder (3) and the seal (18) such that the seal (18) is retained in a defined position with respect to the pump cylinder (3).

Description

Titel:  Title:
Pumpe, insbesondere Kraftstoffpumpe  Pump, in particular fuel pump
Die vorliegende Erfindung betrifft eine Pumpe, insbesondere Kraftstoffpumpe einer Brennkraftmaschine, aufweisend einen Pumpenzylinder und einen in dem Pumpenzylinder unter Bildung eines Pumpenarbeitsraums translatorisch auf und ab bewegbaren Pumpenstößel, wobei der Pumpenstößel gegenüber dem Pumpenzylinder auf einer dem Pumpenarbeitsraum gegenüberliegenden Antriebsseite mittels einer Dichtung abgedichtet ist. The present invention relates to a pump, in particular a fuel pump of an internal combustion engine, comprising a pump cylinder and a pumping ram in the pump cylinder to form a pump working space up and down movable pump plunger, wherein the pump plunger is sealed relative to the pump cylinder on a pump working chamber opposite drive side by means of a seal.
Stand der Technik State of the art
Eine derartige, als Kraftstoffpumpe ausgebildete Pumpe ist aus der DE 10 2010 043 570 A1 bekannt. Diese Pumpe ist zur Förderung von Kraftstoff Such, designed as a fuel pump pump is known from DE 10 2010 043 570 A1. This pump is designed to pump fuel
beispielsweise in einen Hochdruckspeicher ausgelegt, aus dem der dort gespeicherte Kraftstoff zur Einspritzung in zugeordnete Brennräume einer Brennkraftmaschine von Kraftstoffinjektoren entnommen wird. Die for example, designed in a high-pressure accumulator, from which the fuel stored there is removed for injection into the associated combustion chambers of an internal combustion engine of fuel injectors. The
Kraftstoffpumpe weist einen konventionellen Aufbau auf, bei dem ein Fuel pump has a conventional structure in which a
Pumpenstößel in einem Pumpenzylinder translatorisch auf und ab bewegbar ist. Im Bereich einer Antriebsseite des Pumpenstößels ist dieser gegenüber dem Pumpenzylinder mittels einer Dichtung abgedichtet. Diese Dichtung weist einen mehrteiligen Aufbau auf und setzt sich unter anderem aus einem Innenring und einem Außenring zusammen. Insgesamt ist der Aufbau dieser Dichtung aufwendig und auch die Befestigung an dem Pumpenzylinder ist aufwändig, so dass unter Anderem die Montage mit relativ hohem Arbeitsaufwand verbunden ist. Pump plunger in a pump cylinder is translationally movable up and down. In the region of a drive side of the pump tappet, this is sealed off from the pump cylinder by means of a seal. This seal has a multi-part construction and is composed inter alia of an inner ring and an outer ring. Overall, the structure of this seal is expensive and the attachment to the pump cylinder is complex, so that, among other things, the assembly is associated with relatively high workload.
Der Erfindung liegt die Aufgabe zugrunde, eine Pumpe bereitzustellen, bei der die Abdichtung eines Pumpenstößels gegenüber einem Pumpenzylinder bei geringem Aufwand gegenüber dem Stand der Technik verbessert ist. The invention has for its object to provide a pump in which the sealing of a pump plunger against a pump cylinder is improved with little effort over the prior art.
Offenbarung der Erfindung Disclosure of the invention
Vorteile der Erfindung Diese Aufgabe wird dadurch gelöst, dass ein Fixierelement vorgesehen ist, das mit dem Pumpenzylinder und der Dichtung in der Form zusammenwirkt, dass die Dichtung in einer definierten Position in Bezug zu dem Pumpenzylinder gehalten ist. Bei dieser Ausgestaltung kommt eine nur einstückig ausgebildete Dichtung und das Fixierelement zum Einsatz, so dass insgesamt nur zwei Teile an der Pumpe verbaut werden müssen. Dadurch ist der Bauaufwand und Advantages of the invention This object is achieved in that a fixing element is provided, which cooperates with the pump cylinder and the seal in the form that the seal is held in a defined position with respect to the pump cylinder. In this embodiment, an only integrally formed seal and the fixing element is used, so that in total only two parts must be installed on the pump. This is the construction cost and
Montageaufwand gegenüber dem Stand der Technik deutlich verringert beziehungsweise vereinfacht. Die Pumpe kann eine beliebige zur Förderung eines Mediums ausgelegte Pumpe sein, ist aber bevorzugt eine Kraftstoffpumpe, ganz bevorzugt eine Kraftstoffh och d ruckpumpe zur Anwendung bei einem Common-Rail-Einspritzsystem einer Brennkraftmaschine. Dabei ist die Pumpe weiterhin als sogenannte Steckpumpe ausgebildet, die direkt in ein Gehäuse, beispielsweise ein Kurbelgehäuse oder ein Räderkastengehäuse, der Assembly costs compared to the prior art significantly reduced or simplified. The pump may be any pump designed to deliver a medium, but is preferably a fuel pump, very preferably a fuel-high-pressure pump for use in a common-rail injection system of an internal combustion engine. The pump is further designed as a so-called plug-in pump directly into a housing, such as a crankcase or a gearbox housing, the
Brennkraftmaschine eingebaut wird. Dabei ist es dann zwingend erforderlich, dass der Förderbereich der Pumpe von dem Antriebsbereich der Pumpe hydraulisch getrennt ist, da in diesen Bereichen unterschiedliche Medien vorhanden sind. So steht der Förderbereich der Pumpe mit Kraftstoff, beispielsweise Dieselkraftstoff, in Kontakt, während der Antriebsbereich, der beispielsweise in das Kurbelgehäuse der Brennkraftmaschine hineinragt, bevorzugt von dem Schmieröl der Brennkraftmaschine beaufschlagt ist. Um zu verhindern, dass insbesondere Kraftstoff in das Schmieröl gelangt, ist die erfindungsgemäß befestigte Dichtung vorgesehen. Internal combustion engine is installed. It is then absolutely necessary that the delivery area of the pump is hydraulically separated from the drive area of the pump, since different media are present in these areas. Thus, the delivery region of the pump is in contact with fuel, for example diesel fuel, while the drive region, which protrudes into the crankcase of the internal combustion engine, for example, is preferably acted upon by the lubricating oil of the internal combustion engine. In order to prevent, in particular, fuel from entering the lubricating oil, the seal fastened according to the invention is provided.
In Weiterbildung der Erfindung ist das Fixierelement ein einen Halteabsatz aufweisender Ring. Ein solches Bauteil kann einfach und kostengünstig gefertigt werden. In a development of the invention, the fixing element is a retaining shoulder having a ring. Such a component can be manufactured easily and inexpensively.
In weiterer Ausgestaltung der Erfindung ist der Ring ein geschlossener Ring, der dann wiederum in weiterer Ausgestaltung eine durchgehende in eine umlaufende Ringnut an einem Befestigungsabsatz des Pumpenzylinders eingreifende Befestigungsnase (oder Rastnase) aufweist. In a further embodiment of the invention, the ring is a closed ring, which in turn in another embodiment, a continuous engaging in a circumferential annular groove on a mounting shoulder of the pump cylinder mounting lug (or latch).
Alternativ kann wiederum in Weiterbildung der Erfindung der Ring ein offener Ring mit Ringabschnitten sein, wobei wiederum in weiterer Ausgestaltung der Erfindung die Ringabschnitte in eine Ringnut an einem Befestigungsabsatz des Pumpenzylinders eingreifende Befestigungsnasenabschnitte aufweisen. Diese Ausgestaltung ist durch die offene Ausgestaltung mit Ringabschnitten besonders einfach zu montieren und weist darüber hinaus ein geringes Gewicht auf. Alternatively, in turn, in a further development of the invention, the ring may be an open ring with ring sections, wherein in a further embodiment of the invention the ring sections in an annular groove on an attachment paragraph of the pump cylinder engaging mounting lug portions have. These Design is particularly easy to install due to the open design with ring sections and also has a low weight.
In Weiterbildung der Erfindung ist der Werkstoff des Rings Kunststoff und/oder Metall. Aus beiden Werkstoffen kann der Ring kostengünstig hergestellt werden. In a further development of the invention, the material of the ring is plastic and / or metal. From both materials, the ring can be produced inexpensively.
In weiterer Ausgestaltung der Erfindung weist der Pumpenzylinder eine die Dichtung aufnehmende Dichtungsausnehmung auf. Grundsätzlich wäre es im Rahmen der Erfindung möglich, dass die Dichtung mit dem erfindungsgemäßen Fixierelement unterhalb des Pumpenzylinders in einer definierten Position gehalten wird. Dadurch, dass die Dichtung aber in eine Dichtungsausnehmung in dem Pumpenzylinder eingesetzt ist, ist sichergestellt, dass die Dichtung auch schon ohne das Fixierelement in einer definierten Lage angeordnet ist, wodurch beispielsweise auch die Montage vereinfacht wird. Zudem ist dadurch sichergestellt, dass die Dichtung auch gegenüber der Dichtungsausnehmung problemlos und dauerhaft abgedichtet ist. Das Fixierelement stellt bei dieser Ausgestaltung nur sicher, dass die Dichtung auf keinen Umständen aus der Dichtungsausnehmung während des Betriebs der entsprechenden Pumpe beispielsweise hervorgerufen durch die dauernden Auf- und Abbewegungen des Pumpenstößels herauswandern kann. In a further embodiment of the invention, the pump cylinder on a seal receiving the sealing recess. In principle, it would be possible in the context of the invention that the seal is held with the fixing element according to the invention below the pump cylinder in a defined position. However, because the seal is inserted in a sealing recess in the pump cylinder, it is ensured that the seal is already arranged without the fixing element in a defined position, whereby, for example, also the assembly is simplified. In addition, this ensures that the seal is easily and permanently sealed against the seal recess. In this embodiment, the fixing element only ensures that the seal can not migrate out of the seal recess during operation of the corresponding pump, for example caused by the continuous up and down movements of the pump tappet.
In Weiterbildung der Erfindung ist die Dichtung eine einteilige Elastomer- Dichtung, die wiederum in weiterer Ausgestaltung der Erfindung zwei gegenüberliegende, voneinander weg weisende V-förmige Federelemente aufweist. Diese V-förmigen Federelemente stellen sicher, dass angrenzende, umlaufende Dichtlippen der Elastomer-Dichtung sowohl gegen den Schaft des Pumpenstößels, als auch gegen die Wandung der Dichtungsausnehmung gedrückt wird. Dadurch, dass zwei gegenüberliegende V-förmige Federelemente verbaut sind, ist eine Abdichtung sowohl auf der durch Leckagekraftstoff beaufschlagten Seite, als auch auf der von Schmieröl beaufschlagten Seite derIn a further development of the invention, the seal is a one-piece elastomer seal, which in turn in a further embodiment of the invention has two opposite, facing away from each other V-shaped spring elements. These V-shaped spring elements ensure that adjacent, circumferential sealing lips of the elastomeric seal is pressed both against the shaft of the pump plunger and against the wall of the sealing recess. The fact that two opposing V-shaped spring elements are installed, a seal on both the side acted upon by leakage fuel, as well as on the acted upon by lubricating oil side of the
Dichtung sichergestellt. Seal secured.
Zusammenfassend ist erfindungsgemäß eine Pumpe bereitgestellt, bei der die Abdichtung des Pumpenstößels gegenüber dem Pumpenzylinder in einem sehr kostengünstigen Herstellungsprozess und Montageprozess mit nur zweiIn summary, a pump according to the invention is provided in which the sealing of the pump plunger relative to the pump cylinder in a very cost-effective production process and assembly process with only two
Bauteilen hergestellt wird. Dabei ist das zu verarbeitende Fixierelement besonders kostengünstig beispielsweise als Spritzgießteil bei einer Herstellung aus Kunststoff herstellbar. Es besteht zudem nur eine kurze Toleranzkette, da der zur Verfügung stehende Bauraum hauptsächlich durch die Innenkontur des Gehäuses, in das die Pumpe eingebaut wird, bestimmt wird. Components is manufactured. In this case, the fixing element to be processed can be produced in a particularly cost-effective manner, for example as an injection-molded part in a production from plastic. There is also only a short tolerance chain because the available space is determined mainly by the inner contour of the housing into which the pump is installed.
Weitere vorteilhafte Ausgestaltungen der Erfindung sind der Further advantageous embodiments of the invention are the
Zeichnungsbeschreibung zu entnehmen, in der in den Figuren dargestellteDrawing description can be seen, in the illustrated in the figures
Ausführungsbeispiele näher beschrieben sind. Embodiments are described in detail.
Kurze Beschreibung der Zeichnung Es zeigen: Brief description of the drawing In the drawings:
Figur 1 einen Schnitt durch eine erfindungsgemäß ausgebildete Pumpe, 1 shows a section through an inventively designed pump,
Figur 1 a eine Ausschnittsvergrößerung aus Figur 1 im Bereich einer FIG. 1 a shows a detail enlargement from FIG. 1 in the region of FIG
Dichtung,  Poetry,
Figur 1 aa eine perspektivische Detailansicht eines als geschossener Ring ausgebildeten Fixierelements, Figur 1 b eine Ausschnittsvergrößerung aus Figur 1 im Bereich einer FIG. 1 aa shows a perspective detail view of a fixing element designed as a closed ring, FIG. 1 b shows a detail enlargement from FIG. 1 in the region of FIG
Dichtung mit einem gegenüber Figur 1 anders ausgebildeten Fixierelement und  Seal with a comparison with Figure 1 differently configured fixing and
Figur 1 bb eine perspektivische Detailansicht eines als offener Ring Figure 1 bb is a detailed perspective view of an open ring
ausgebildeten Fixierelements,  trained fixing element,
Ausführungsformen der Erfindung Embodiments of the invention
Die in Figur 1 dargestellte Pumpe 1 ist insbesondere eine Kraftstoffpumpe, ganz bevorzugt eine Kraftstoffhochdruckpumpe, die insbesondere in Common-Rail-The pump 1 illustrated in FIG. 1 is, in particular, a fuel pump, very particularly a high-pressure fuel pump, which is particularly suitable in common rail systems.
Einspritzsystemen Verwendung findet. Der Pumpe 1 wird aus einem Injection systems is used. The pump 1 is made of a
Kraftstoffniederdrucksystem Kraftstoff zugeführt, der von der Pumpe 1 in einen Hochdruckspeicher gefördert wird. Aus dem Hochdruckspeicher (Rail) wird der dort gespeicherte Kraftstoff, insbesondere Dieselkraftstoff, zur Einspritzung in zugeordnete Brennräume einer Brennkraftmaschine, insbesondere einer selbstzündenden Brennkraftmaschine, von entsprechenden Kraftstoffinjektoren entnommen. Das Common-Rail-Einspritzsystem mit der Pumpe 1 kann aber auch bei einer fremdgezündeten mit Benzin betriebenen Brennkraftmaschine verbaut sein. Fuel low pressure system fuel supplied, which is funded by the pump 1 in a high-pressure accumulator. From the high-pressure accumulator (rail) stored there fuel, especially diesel fuel for injection into associated combustion chambers of an internal combustion engine, in particular a self-igniting internal combustion engine, taken from corresponding fuel injectors. However, the common rail injection system with the pump 1 can be installed in a spark-ignited gasoline-powered internal combustion engine.
Die Pumpe 1 weist einen einstückig mit einem Pumpenzylinderkopf 2 The pump 1 has an integral with a pump cylinder head. 2
ausgebildeten Pumpenzylinder 3 auf, der in ein Gehäuse 4, beispielsweise eintrained pump cylinder 3, in a housing 4, for example a
Kurbelgehäuse oder ein Räderkastengehäuse der Brennkraftmaschine, eingebaut ist. Das Gehäuse 4 kann aber auch ein eigenständiges Gehäuse 4 für die Pumpe 1 sein, das an der Brennkraftmaschine angebaut wird. In den Pumpenzylinder 3 ist ein Pumpenstößel 5 eingesetzt, der sich mit einemCrankcase or a gearbox housing of the internal combustion engine, is installed. The housing 4 may also be an independent housing 4 for the pump 1, which is mounted on the internal combustion engine. In the pump cylinder 3, a pump plunger 5 is inserted, which is connected to a
Pumpenstößelfuß 6 auf einem Rollenstößel 7 abstützt. Dabei drückt eine vorgespannte Stößelfeder 8, die sich an einem pumpenzylinderkopfseitigen Absatz in dem Pumpenzylinder 3 abstützt, gegenüberliegend eine Scheibe 9, die auf dem Pumpenstößelfuß 6 aufliegt, fest gegen den Rollenstößel 7. Der Rollenstößel 7 weist eine mittels eines Bolzens 10 an diesem unter Einfügung eines Lagers 1 1 befestigte Laufrolle 12 auf, die auf einem nicht dargestellten Nocken einer Nockenwelle abrollt. Die Nockenwelle ist bevorzugt Bestandteil der Brennkraftmaschine und kann beispielsweise eine um einen Nocken erweiterte Gaswechselnockenwelle sein. Bei einer Drehbewegung der Nockenwelle wird der Rollenstößel 7 und damit der Pumpenstößel 5 in den Pumpenzylinder 3 translatorisch auf und ab bewegt. Der Pumpenstößel 5 wirkt dabei mit einem in dem Pumpenzylinderkopf 2 angeordneten Pumpenarbeitsraum 13 zusammen, in den über ein beispielsweise elektromagnetisch betätigtes Einlassventil 14 durch eine Zuführleitung 15 zugeführter Kraftstoff gesteuert eingelassen wird. Der so in den Pumpenarbeitsraum 13 eingebrachte Kraftstoff wird bei einer Pump Stößelfuß 6 supported on a roller tappet 7. In this case, a biased plunger spring 8, which is supported on a pump cylinder head side paragraph in the pump cylinder 3, opposite a disc 9, which rests on the Pumpenstößelfuß 6, firmly against the roller tappet 7. The roller tappet 7 has a means of a bolt 10 at this insertion a bearing 1 1 fixed roller 12, which rolls on a cam, not shown, of a camshaft. The camshaft is preferably part of the internal combustion engine and may be, for example, a gas exchange camshaft extended by a cam. During a rotational movement of the camshaft, the roller tappet 7 and thus the pump tappet 5 are moved up and down in the pump cylinder 3 in a translatory manner. The pump plunger 5 cooperates with a pump working chamber 13 arranged in the pump cylinder head 2, into which fuel is introduced in a controlled manner via a, for example, electromagnetically actuated intake valve 14, through a supply line 15. The thus introduced into the pump working chamber 13 fuel is at a
Aufwärtsbewegung des Pumpenstößels 5 verdichtet und über einen seitlichen Hochdruckanschluss 16 mit einem eingesetzten Rückschlagventil 17 in eine nicht dargestellte Hochdruckleitung gefördert, die mit dem Hochdruckspeicher verbunden ist.  Upward movement of the pump plunger 5 compressed and promoted via a lateral high-pressure port 16 with an inserted check valve 17 in a high-pressure line, not shown, which is connected to the high-pressure accumulator.
Der Pumpenstößel 5 ist gegenüber dem Pumpenzylinder 3 mittels einer oberhalb des Pumpenstößelfußes 6 angeordneten Dichtung 18 gegenüber dem The pump plunger 5 is opposite the pump cylinder 3 by means of a arranged above the pump plunger base 6 seal 18 against the
Pumpenzylinder 3 abgedichtet. Diese Abdichtung stellt sicher, dass entlang des Pumpenstößels 5 in Richtung des Pumpenstößelfußes 6 gelangender Pump cylinder 3 sealed. This seal ensures that along the pump tappet 5 in the direction of the pump tappet foot 6 reaching
Leckagekraftstoff von den ölgeschmierten Komponenten der Pumpe 1 und derLeakage fuel from the oil lubricated components of the pump 1 and the
Brennkraftmaschine ferngehalten wird. Die Dichtung 18 ist in eine Internal combustion engine is kept away. The seal 18 is in a
Dichtungsausnehmung 19, die in den Pumpenzylinder 3 eingelassen ist, eingesetzt. Die Dichtungsausnehmung 19 kann oberhalb der Dichtung 18 mit einem Kanal verbunden sein, über den der Leckagekraftstoff beispielsweise in das Kraftstoffniederdrucksystem abgeführt wird. Die Dichtung 18 ist als einteilige Elastomer-Dichtung ausgebildet und mittels eines beispielsweise aus Kunststoff oder Metall gefertigten Fixierelementes 20 festgehalten. Das Fixierelement 20 ist in dem Ausführungsbeispiel gemäß Figur 1 und der entsprechenden Seal recess 19, which is inserted into the pump cylinder 3, used. The seal recess 19 can above the seal 18 with be connected to a channel through which the leakage fuel is discharged, for example, in the fuel low pressure system. The seal 18 is formed as a one-piece elastomeric seal and held by means of a, for example, made of plastic or metal fixing 20. The fixing element 20 is in the embodiment of Figure 1 and the corresponding
Ausschnittsvergrößerung gemäß Figur 1 a sowie der perspektivischen Ansicht gemäß Figur 1 aa als ein geschlossener und einen umlaufenden Halteabsatz 21 aufweisender Ring 22a ausgebildet. Der Ring 22a weist eine umlaufende Befestigungsnase 23a auf, die in eine umlaufende Ringnut 24 an einem  Sectional enlargement according to Figure 1 a and the perspective view of Figure 1 aa as a closed and a circumferential holding paragraph 21 exhibiting ring 22a formed. The ring 22 a has a circumferential fastening lug 23 a, which in a circumferential annular groove 24 at a
Befestigungsabsatz 25 in dem Pumpenzylinder 3 eingreift. Der umlaufendeFixing paragraph 25 engages in the pump cylinder 3. The circulating
Halteabsatz 21 greift unter die Dichtung 18 und stellt sicher, dass diese fest in der Dichtungsausnehmung 19 gehalten ist. Holding shoulder 21 engages under the seal 18 and ensures that it is firmly held in the seal recess 19.
Die Dichtung 18 weist zwei voneinander wegweisende, gegenüberliegende V- förmige Federelemente 26a, 26b auf, die so gespannt sind, dass entsprechende endseitige Dichtlippen der Dichtung 18 an den Pumpenstößel 5 und an der Wandung der Dichtungsausnehmung 19 anliegen. The seal 18 has two mutually pioneering, opposite V-shaped spring elements 26a, 26b, which are so taut that corresponding end-side sealing lips of the seal 18 abut the pump plunger 5 and on the wall of the sealing recess 19.
Bei dem in der Ausschnittsvergrößerung 1 b und der perspektivischen Ansicht 1 bb des Fixierelements 20 gezeigten Ausführungsbeispiel weist das In the embodiment shown in the enlarged detail 1 b and the perspective view 1 bb of the fixing element 20 has the
Fixierelement 20 einen offenen Ring 22b mit zumindest drei (oder mehr) Ringabschnitten auf. Die Ringabschnitte sind bevorzugt in gleichen  Fixing 20 on an open ring 22b with at least three (or more) ring sections. The ring sections are preferably in the same
Winkelabständen angeordnet und einstückig mit dem Halteabsatz 21 Angular distances arranged and integral with the retaining shoulder 21st
ausgebildet. Die Ringabschnitte weisen entsprechende educated. The ring sections have corresponding
Befestigungsnasenabschnitte 23b auf, die ebenfalls in die umlaufende RingnutAttachment nose portions 23b, which also in the circumferential annular groove
24 eingreifen. Das so ausgebildete Fixierelement 20 gemäß Figur 1 b 24 intervene. The thus formed fixing element 20 according to FIG. 1 b
beziehungsweise 1 bb ist besonders einfach zu montieren. or 1 bb is particularly easy to assemble.

Claims

Patentansprüche claims
1 . Pumpe (1 ), insbesondere Kraftstoffpumpe einer Brennkraftmaschine, aufweisend einen Pumpenzylinder (3) und einen in dem Pumpenzylinder (3) unter Bildung eines Pumpenarbeitsraums (13) translatorisch auf und ab bewegbaren Pumpenstößel (5), wobei der Pumpenstößel (5) gegenüber dem Pumpenzylinder (3) auf einer dem Pumpenarbeitsraum (13) gegenüberliegenden Antriebsseite mittels einer Dichtung (18) abgedichtet ist, 1 . Pump (1), in particular fuel pump of an internal combustion engine, comprising a pump cylinder (3) and in the pump cylinder (3) to form a Pumpenarbeitsraums (13) translationally movable up and down pump plunger (5), wherein the pump plunger (5) relative to the pump cylinder (3) is sealed on a drive side opposite the pump working space (13) by means of a seal (18),
dadurch gekennzeichnet, dass ein Fixierelement (20) vorgesehen ist, das mit dem Pumpenzylinder (3) und der Dichtung (18) in der Form zusammenwirkt, dass die Dichtung (18) in einer definierten Position in Bezug zu dem Pumpenzylinder (3) gehalten ist.  characterized in that a fixing element (20) is provided which cooperates with the pump cylinder (3) and the seal (18) in the form that the seal (18) is held in a defined position with respect to the pump cylinder (3) ,
2. Pumpe (1 ) nach Anspruch 1 , 2. Pump (1) according to claim 1,
dadurch gekennzeichnet, dass das Fixierelement (20) ein einen umlaufenden Halteabsatz (21 ) aufweisender Ring (22a, 22b) ist.  characterized in that the fixing element (20) is a ring (22a, 22b) having a peripheral retaining shoulder (21).
3. Pumpe (1 ) nach Anspruch 2, 3. pump (1) according to claim 2,
dadurch gekennzeichnet, dass der Ring ein geschlossener Ring (22a) ist.  characterized in that the ring is a closed ring (22a).
4. Pumpe (1 ) nach Anspruch 3, 4. Pump (1) according to claim 3,
dadurch gekennzeichnet, dass der Ring (22a) eine durchgehende, in eine umlaufende Ringnut (24) eines Befestigungsabsatzes (25) des Pumpenzylinders (3) eingreifende Befestigungsnase (23a) aufweist.  characterized in that the ring (22a) has a continuous, in a circumferential annular groove (24) of a fastening paragraph (25) of the pump cylinder (3) engaging the fastening lug (23a).
5. Pumpe (1 ) nach Anspruch 2, 5. Pump (1) according to claim 2,
dadurch gekennzeichnet, dass der Ring ein offener Ring (22b) mit Ringabschnitten ist.  characterized in that the ring is an open ring (22b) with ring sections.
6. Pumpe (1 ) nach Anspruch 5, 6. pump (1) according to claim 5,
dadurch gekennzeichnet, dass die Ringabschnitte des offenen Rings (22b) in eine Ringnut 24 an einem Befestigungsabsatz (25) des Pumpenzylinders (3) eingreifende Befestigungsnasenabschnitte (23b) aufweisen. characterized in that the ring portions of the open ring (22b) into an annular groove 24 on a mounting shoulder (25) of the Pump cylinder (3) engaging lug portions (23b) have.
7. Pumpe (1 ) nach einem der Ansprüche 2-6, 7. Pump (1) according to one of claims 2-6,
dadurch gekennzeichnet, dass der Werkstoff des Rings (22a, 22b) Kunststoff und/oder Metall ist.  characterized in that the material of the ring (22a, 22b) is plastic and / or metal.
8. Pumpe (1 ) nach einem der vorherigen Ansprüche, 8. Pump (1) according to one of the preceding claims,
dadurch gekennzeichnet, dass der Pumpenzylinder (3) eine die Dichtung (18) aufnehmende Dichtungsausnehmung (19) aufweist.  characterized in that the pump cylinder (3) has a seal (18) receiving the sealing recess (19).
9. Pumpe (1 ) nach einem der vorherigen Ansprüche, 9. Pump (1) according to one of the preceding claims,
dadurch gekennzeichnet, dass die Dichtung (18) eine einteilige Elastomer-Dichtung ist.  characterized in that the seal (18) is a one-piece elastomeric seal.
10. Pumpe (1 ) nach Anspruch (9); 10. pump (1) according to claim (9);
dadurch gekennzeichnet, dass die Elastomer-Dichtung zwei gegenüberliegende, voneinander weg weisende V-förmige  characterized in that the elastomeric seal two opposite, facing away from each other V-shaped
Federelemente (26a, 26b) aufweist.  Spring elements (26a, 26b).
PCT/EP2014/051503 2013-03-07 2014-01-27 Pump, in particular fuel pump WO2014135303A1 (en)

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Application Number Priority Date Filing Date Title
DE102013203902.6 2013-03-07
DE102013203902.6A DE102013203902A1 (en) 2013-03-07 2013-03-07 Pump, in particular fuel pump

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DE102018201111B4 (en) 2018-01-24 2020-06-18 Audi Ag Method for monitoring at least one parking space for availability and system for performing the method

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3652098A (en) * 1969-04-30 1972-03-28 Mitsubishi Heavy Ind Ltd Sealing device for reciprocating pump
EP1657438A1 (en) * 2004-11-16 2006-05-17 Denso Corporation High pressure fuel pump
DE102007038984A1 (en) * 2007-08-17 2009-02-19 Robert Bosch Gmbh Fuel pump for a fuel system of an internal combustion engine
US7513759B1 (en) * 2003-07-03 2009-04-07 Blume George H Valve guide and spring retainer assemblies
DE102010043570A1 (en) 2009-11-09 2011-07-28 DENSO CORPORATION, Aichi-pref. high pressure pump
DE102011106920A1 (en) * 2010-07-08 2012-01-12 Jan Noord Sealing unit for sealing piston or plunger that is utilized with high pressure piston pump or high pressure plunger pump, has seal core placed in chamber, where seal core is moved relative to chamber
US20120195779A1 (en) * 2011-01-27 2012-08-02 Nippon Soken, Inc. High pressure pump

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3652098A (en) * 1969-04-30 1972-03-28 Mitsubishi Heavy Ind Ltd Sealing device for reciprocating pump
US7513759B1 (en) * 2003-07-03 2009-04-07 Blume George H Valve guide and spring retainer assemblies
EP1657438A1 (en) * 2004-11-16 2006-05-17 Denso Corporation High pressure fuel pump
DE102007038984A1 (en) * 2007-08-17 2009-02-19 Robert Bosch Gmbh Fuel pump for a fuel system of an internal combustion engine
DE102010043570A1 (en) 2009-11-09 2011-07-28 DENSO CORPORATION, Aichi-pref. high pressure pump
DE102011106920A1 (en) * 2010-07-08 2012-01-12 Jan Noord Sealing unit for sealing piston or plunger that is utilized with high pressure piston pump or high pressure plunger pump, has seal core placed in chamber, where seal core is moved relative to chamber
US20120195779A1 (en) * 2011-01-27 2012-08-02 Nippon Soken, Inc. High pressure pump

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