EP0816669B1 - Fuel transfer pump for a fuel injection pump for an engine - Google Patents

Fuel transfer pump for a fuel injection pump for an engine Download PDF

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Publication number
EP0816669B1
EP0816669B1 EP97100912A EP97100912A EP0816669B1 EP 0816669 B1 EP0816669 B1 EP 0816669B1 EP 97100912 A EP97100912 A EP 97100912A EP 97100912 A EP97100912 A EP 97100912A EP 0816669 B1 EP0816669 B1 EP 0816669B1
Authority
EP
European Patent Office
Prior art keywords
filter element
fuel
housing
feed pump
pump
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP97100912A
Other languages
German (de)
French (fr)
Other versions
EP0816669A2 (en
EP0816669A3 (en
Inventor
Stanislaw Dr. Bodzak
Hanspeter Mayer
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Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Filing date
Publication date
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Publication of EP0816669A2 publication Critical patent/EP0816669A2/en
Publication of EP0816669A3 publication Critical patent/EP0816669A3/en
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Publication of EP0816669B1 publication Critical patent/EP0816669B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/04—Feeding by means of driven pumps
    • F02M37/041—Arrangements for driving gear-type pumps
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/04—Feeding by means of driven pumps
    • F02M37/14—Feeding by means of driven pumps the pumps being combined with other apparatus
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/22—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
    • F02M37/32—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements
    • F02M37/34—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements by the filter structure, e.g. honeycomb, mesh or fibrous
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/22—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
    • F02M37/32—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements
    • F02M37/44—Filters structurally associated with pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C13/00—Adaptations of machines or pumps for special use, e.g. for extremely high pressures
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/22—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
    • F02M37/32—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements
    • F02M37/42—Installation or removal of filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2210/00—Fluid
    • F04C2210/60—Condition
    • F04C2210/62—Purity

Definitions

  • the invention relates to a fuel feed pump for a Fuel injection pump for internal combustion engines according to the Genus of claim 1.
  • a rotatingly driven pair with each other Intermeshing gears are provided which have fuel from one a suction tank connected along a suction tank between the end face, the gears and the peripheral wall the pumping chamber formed in a conveying channel with the Fuel injection pump promotes connected pressure chamber.
  • a shaft is attached to a gear wheel, which is connected to the Shaft attacking drive element is driven to rotate.
  • the drive element is outside the housing of the pump chamber provided and transmits the rotary motion to one with the first gear meshing second gear on a housing-bearing axis is arranged.
  • Drive elements are, for example, via a universal joint or a slip clutch connected to the drive shaft.
  • a filter element which filters out any particles present in the fuel in order to supply cleaned fuel to the fuel feed pump.
  • a filter housing is used for such fuel cleaning with a filter element in a fuel delivery line between the storage tank and the fuel delivery pump arranged.
  • a fuel pump is known from US Pat. No. 4,740,140 Housing a filter element is provided.
  • the fuel is from promoted two meshing gears and is on the filter element fed to the internal combustion engine.
  • the fuel delivery pump according to the invention for a fuel injection pump for internal combustion engines has the advantage that in the housing of the fuel delivery pump at least one filter element is used under tension. This ensures that when the pump housing heats up the filter element with sealing surfaces arranged on the filter element form a liquid-tight connection, so that exclusively filtered fuel can flow into the pump chamber or into the fuel line leading to the fuel injection pump can be initiated.
  • a filter element can be used in the Intake chamber. This can do that Filter element have a relatively large filter area, so that no excessive flow resistance can arise. Consequently throttling can be avoided even if a relatively close-meshed filter element in a fuel delivery pump is provided.
  • Filter element in an inlet opening of the housing to the intake space Filter element can be arranged or at least partially protrudes, to avoid an elevated Throttling effect due to the lower available standing flow cross-section the mesh size of the Filter element can be slightly enlarged.
  • a filter element may be provided so that if necessary, abrasion of the pump drive is intercepted can be. Such particles can come from the fuel injection pump be kept away.
  • a collecting space for dirt particles be provided in which the filter element dirt can settle.
  • Fuel feed pump shown in a not illustrated feed line from a storage tank to one Fuel injection pump used for internal combustion engines is.
  • the fuel delivery pump has in its housing 1 a pump chamber 3, into which a rotatingly driven A pair of meshing gears 7, 9 is arranged.
  • a first gear wheel 7 fastened to a shaft 5 is thereby driven by means of a drive element 8 and transmits this rotary movement by means of a spur toothing to a second gear 9 meshing with the first gear 7, which is arranged on a housing-mounted axis 11.
  • the Gears 7, 9 divide the pump chamber 3 by their Tooth mesh in two parts, a first part one Intake chamber 13 and a second part form a pressure chamber 15.
  • the suction chamber 13 is one between each Tooth grooves on the end faces of the first gear 7 and second gear 9 and the peripheral wall of the pump chamber 3rd formed delivery channel 17 connected to the pressure chamber 15.
  • the suction chamber 13 and the pressure chamber 15 each have a connection opening in the wall of the pump housing 1, through which the suction space 13 with a no closer shown suction line from the storage tank and the pressure chamber 15 with a feed line, also not shown, for Suction chamber of the fuel injection pump is connected.
  • the pump chamber 3 is on one of them frontal axis direction of the shaft 5 and axis 11 of one Closed cover 23, which in the representation of the Fig. 2 was removed and so a view of the pump interior allows.
  • a filter element 26 is arranged in the suction space 13 separates the inlet opening 19 to the delivery channel 17.
  • the Filter element 26 is pre-stressed in suction space 13 used and lies with the filter element 26 comprehensive seal 27 in a receptacle 28 of the suction space 13 on.
  • the bias can be achieved in that a warming housing 1 during operation of the Fuel delivery pump the filter element 26 with its Seal 27 in the designated receptacles 28 in Suction chamber 13 abut.
  • the filter element 26 is designed as a flat structure and has a cross-sectional shape shown in FIG. 2 so that an arranged in the housing 1 opening 29, in a check valve can be arranged, recessed is.
  • the Filter element 26 is a spatial structure with a curved Surface. So that an easy insertion and The filter element 26 is replaced, the upper one and lower sealing surface formed straight, so that the Filter element 26 are inserted into the suction space 13 can.
  • a Collection space 31 is provided in a lower area of the suction space 13 .
  • the in the fuel supplied entrained particles are carried by the filter element 26 retained and settle in the settling room 31.
  • An opening 33 is in a housing wall 32 of the housing 1 provided through which the collecting space 31 is accessible from the outside is.
  • the opening 33 is through a viewing window 34 sealed liquid-tight, so that a simple Visual inspection is possible.
  • the filter element 26 can, depending on the Use a different mesh size exhibit.
  • the mesh size of the filter element 26 is furthermore in relation to the size of the intake chamber 13 usable filter element, so that a throttling effect the filter element 26 can be avoided.
  • the Mesh size should be made relatively small because of a large one Flow cross section is available. Alternatively, you can be provided that the filter element in the inlet opening 19 is used, the mesh size being larger here can be trained.
  • the mesh size of the Filter element to be adapted to the application, so that for example at low temperatures, relocating the filter can be prevented by flocculation of diesel fuel can.
  • a relative close-meshed filter element 26 is used to To be able to filter out dust particles.
  • the time for cleaning the fuel delivery pump can over the operating time or via an optical control of the collecting room 31 are monitored.
  • the cleaning of the Filter element 26 can be made in that the housing 1st is blown against the fuel delivery direction, so that the stuck in the filter element 26 Can release particles from the filter element 26. these can after blowing out settle in the collecting space 31, the is accessible via the opening 31 so that the stuck particles can be extracted.
  • the housing cover 23 be removed and the filter element 26 from the suction chamber 13 can be removed. At the same time, the collecting space 31 getting cleaned. Then the new filter element 26 reinstalled in the collection room 31 and with the Housing cover 23 closed. There is only one Assembly and disassembly of four cover screws required so that a quick and easy filter change and one Cleaning of the collecting space 31 can take place.
  • Filter element 26 can also be used in the pressure chamber 15 arranged filter element 26 apply.
  • an additional spring element can be provided can, so that the bias is applied in the longitudinal direction can be.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)

Description

Stand der TechnikState of the art

Die Erfindung geht von einer Kraftstoff-Förderpumpe für eine Kraftstoff-Einspritzpumpe für Brennkraftmaschinen nach der Gattung des Patentanspruchs 1 aus.The invention relates to a fuel feed pump for a Fuel injection pump for internal combustion engines according to the Genus of claim 1.

Bei derartigen Kraftstoff-Förderpumpen ist in einer Pumpkammer ein rotierend angetriebenes Paar miteinander kämmender Zahnräder vorgesehen, die Kraftstoff aus einem mit einem Vorratstank verbundenen Ansaugraum entlang einem zwischen der Stirnfläche, der Zahnräder und der Umfangswand der Pumpkammer gebildeten Förderkanal in einen mit der Kraftstoff-Einspritzpumpe verbundenen Druckraum fördert. Auf einer Welle ist ein Zahnrad befestigt, das mit einem an der Welle angreifenden Antriebselement rotierend antreibbar ist. Das Antriebselement ist außerhalb des Gehäuses der Pumpkammer vorgesehen und überträgt die Drehbewegung auf ein mit dem ersten Zahnrad kämmendes zweites Zahnrad, das auf einer gehäusegelagerten Achse angeordnet ist. Derartige Antriebselemente sind beispielsweise über ein Kreuzgelenk oder einer Rutschkupplung mit der Antriebswelle verbunden.In such fuel delivery pumps is in one Pump chamber a rotatingly driven pair with each other Intermeshing gears are provided which have fuel from one a suction tank connected along a suction tank between the end face, the gears and the peripheral wall the pumping chamber formed in a conveying channel with the Fuel injection pump promotes connected pressure chamber. On A shaft is attached to a gear wheel, which is connected to the Shaft attacking drive element is driven to rotate. The drive element is outside the housing of the pump chamber provided and transmits the rotary motion to one with the first gear meshing second gear on a housing-bearing axis is arranged. such Drive elements are, for example, via a universal joint or a slip clutch connected to the drive shaft.

Bei allen bekannten Kraftstoff-Förderpumpen ist es erforderlich, daß zumindest zwischen dem Vorratstank und der Kraftstoff-Förderpumpe ein Filterelement vorgesehen ist, das im Kraftstoff vorhandene Partikel herausfiltert, um gereinigten Kraftstoff der Kraftstoff-Förderpumpe zuzuführen. Für eine derartige Kraftstoffreinigung ist ein Filtergehäuse mit einem Filterelement in einer Kraftstoff-Förderleitung zwischen dem Vorratstank und der Kraftstoff-Förderpumpe angeordnet. Dabei sind jedoch aufgrund der Anschlußstellen zwischen der Kraftstoff-Förderleitung und einer Einlaßöffnung eines Filtergehäuses als auch zwischen einer Auslaßöffnung und einer weiterführenden Kraftstoffleitung sowie durch das das Filterelement aufnehmende Filtergehäuses selbst eine Gefahr für Leckage gegeben.It is the case with all known fuel delivery pumps required that at least between the storage tank and the Fuel feed pump, a filter element is provided, which filters out any particles present in the fuel in order to supply cleaned fuel to the fuel feed pump. A filter housing is used for such fuel cleaning with a filter element in a fuel delivery line between the storage tank and the fuel delivery pump arranged. However, due to the connection points between the fuel delivery line and an inlet opening a filter housing and between an outlet opening and a further fuel line as well as through the the filter element itself receiving a filter housing Leakage hazard.

Aus der US 4 740 140 ist eine Kraftstoffpumpe bekannt, bei der im Gehäuse ein Filterelement vorgesehen ist. Der Kraftstoff wird von zwei kämmenden Zahnrädern gefördert und wird über das Filterelement der Brennkraftmaschine zugeführt.A fuel pump is known from US Pat. No. 4,740,140 Housing a filter element is provided. The fuel is from promoted two meshing gears and is on the filter element fed to the internal combustion engine.

Aus der US 3 695 438 ist darüber hinaus eine Druckregeleinrichtung bekannt, bei der der Kraftstoff über ein im Gehäuse der Druckregeleinrichtung angeordnetes Filterelement geführt wird, um den Kraftstoff von Schmutzpartikeln zu reinigen. Das Filterelement ist hier im wesentlichen zylinderförmig ausgebildet.From US 3,695,438 there is also a pressure control device known in which the fuel via a in the housing of the pressure control device arranged filter element is guided to the fuel clean of dirt particles. The filter element is here formed essentially cylindrical.

Durch die Ausbildung der im Stand der Technik bekannten Filterelemente wird der Ein- und Ausbau des Filterelements erschwert. Darüber hinaus kann es bei einer Erwärmung des Gehäuses der jeweiligen Vorrichtung durch thermische Ausdehnung des Gehäuses zu Undichtigkeiten kommen.By designing the filter elements known in the prior art the installation and removal of the filter element is difficult. About that in addition, when the housing of the respective device is heated leaks due to thermal expansion of the housing come.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Kraftstoff-Förderpumpe für eine Kraftstoff-Einspritzpumpe für Brennkraftmaschinen hat demgegenüber den Vorteil, daß in dem Gehäuse der Kraftstoff-Förderpumpe zumindest ein Filterelement unter Vorspannung eingesetzt ist. Dadurch ist sichergestellt, daß bei einer Erwärmung des Pumpengehäuses das Filterelement mit an dem Filterelement angeordneten Dichtflächen eine flüssigkeitsdichte Verbindung bilden, so daß ausschließlich gefilterter Kraftstoff in die Pumpkammer strömen kann oder in die zur Kraftstoff-Einspritzpumpe führende Kraftstoffleitung eingeleitet werden kann.The fuel delivery pump according to the invention for a fuel injection pump for internal combustion engines, on the other hand, has the advantage that in the housing of the fuel delivery pump at least one filter element is used under tension. This ensures that when the pump housing heats up the filter element with sealing surfaces arranged on the filter element form a liquid-tight connection, so that exclusively filtered fuel can flow into the pump chamber or into the fuel line leading to the fuel injection pump can be initiated.

Dabei ist besonders vorteilhaft, daß in den Ansaugraum ein Filterelement einsetzbar ist. Dadurch kann das Filterelement eine relativ große Filterfläche aufweisen, so daß kein zu großer Strömungswiderstand entstehen kann. Somit kann eine Drosselwirkung vermieden werden, selbst dann, wenn ein relativ engmaschiges Filterelement in einer Kraftstoff-Förderpumpe vorgesehen ist. Alternativ kann vorgesehen sein, daß in einer Einlaßöffnung des Gehäuses zum Ansaugraum ein Filterelement anordenbar ist oder zumindest teilweise hineinragt, wobei zur Vermeidung einer erhöhten Drosselwirkung aufgrund des geringeren zur Verfügung stehenden Strömungsquerschnitts die Maschenweite des Filterelementes geringfügig vergrößert sein kann.It is particularly advantageous that in the Intake chamber a filter element can be used. This can do that Filter element have a relatively large filter area, so that no excessive flow resistance can arise. Consequently throttling can be avoided even if a relatively close-meshed filter element in a fuel delivery pump is provided. Alternatively, it can be provided that in an inlet opening of the housing to the intake space Filter element can be arranged or at least partially protrudes, to avoid an elevated Throttling effect due to the lower available standing flow cross-section the mesh size of the Filter element can be slightly enlarged.

Desweiteren kann vorteilhafterweise im Druckraum des Pumpengehäuses ein Filterelement vorgesehen sein, so daß gegebenenfalls ein Abrieb des Pumpenantriebs abgefangen werden kann. Derartige Partikel können von der Kraftstoff-Einspritzpumpe ferngehalten werden.Furthermore, the pressure chamber of the Pump housing, a filter element may be provided so that if necessary, abrasion of the pump drive is intercepted can be. Such particles can come from the fuel injection pump be kept away.

In einem unteren Bereich des Ansaugraums vor dem Filterelement in Kraftstoff-Förderrichtung gesehen kann vorteilhaferweise ein Sammelraum für Schmutzpartikel vorgesehen sein, in welchem der sich am Filterelement anfallende Schmutz absetzen kann. Durch ein Sichtfenster in einer zum Sammelraum führenden Öffnung einer Gehäusewand kann auf einfache Weise der Zeitpunkt für einen Filterwechsel oder für die Reinigung des Sammelraumes gegeben sein. Weitere Vorteile und vorteilhafte Ausgestaltungen des Gegenstandes der Erfindung sind der Beschreibung, der Zeichnung und den Patentansprüchen entnehmbar.In a lower area of the intake chamber in front of the Filter element can be seen in the fuel delivery direction advantageously a collecting space for dirt particles be provided in which the filter element dirt can settle. Through a viewing window in an opening of a housing wall leading to the collecting space in a simple way the time for a filter change or be given for the cleaning of the collecting room. Further advantages and advantageous configurations of the The invention relates to the description of Drawing and the claims can be found.

Zeichnungdrawing

Ein Ausführungsbeispiel der erfindungsgemäßen Kraftstoff-Förderpumpe ist in der Zeichnung dargestellt und wird in der nachfolgenden Beschreibung näher erläutert. Es zeigen:

Fig. 1
einen Längsschnitt durch eine Kraftstoff-Förderpumpe entlang der Linie I-I von Fig. 2,
Fig. 2
eine Draufsicht auf die in Fig. 1 dargestellte Kraftstoff-Förderpumpe mit einem abgenommenem Gehäusedeckel und
Fig. 3
einen schematische Seitenansicht von Fig. 1 mit einem einen Sammelraum und ein Sichtfenster darstellenden schematischen Teilschnitt.
An embodiment of the fuel delivery pump according to the invention is shown in the drawing and is explained in more detail in the following description. Show it:
Fig. 1
2 shows a longitudinal section through a fuel feed pump along line II of FIG. 2,
Fig. 2
a plan view of the fuel feed pump shown in Fig. 1 with a removed housing cover and
Fig. 3
a schematic side view of FIG. 1 with a schematic partial section representing a collecting space and a viewing window.

Beschreibung des AusführungsbeispielsDescription of the embodiment

In den Fig. 1 bis 3 ist in verschiedenen Ansichten eine Kraftstoff-Förderpumpe dargestellt, die in eine nicht dargestellte Zulaufleitung von einem Vorratstank zu einer Kraftstoff-Einspritzpumpe für Brennkraftmaschinen eingesetzt ist. Dabei weist die Kraftstoff-Förderpumpe in ihrem Gehäuse 1 eine Pumpkammer 3 auf, in die ein rotierend angetriebenes Paar miteinander kämmender Zahnräder 7, 9 angeordnet ist. Dabei wird ein auf einer Welle 5 befestigtes erstes Zahnrad 7 mittels eines Antriebselementes 8 rotierend angetrieben und überträgt diese Drehbewegung mittels einer Stirnverzahnung auf ein mit dem ersten Zahnrad 7 kämmendes zweites Zahnrad 9, das auf einer gehäusegelagerten Achse 11 angeordnet ist. Die Zahnräder 7, 9 teilen dabei die Pumpkammer 3 durch ihren Zahneingriff in zwei Teile, von denen ein erster Teil einen Ansaugraum 13 und ein zweiter Teil einen Druckraum 15 bilden. Der Ansaugraum 13 ist dabei über je einen zwischen den Zahnnuten an den Stirnflächen des ersten Zahnrades 7 und des zweiten Zahnrades 9 und der Umfangswand der Pumpkammer 3 gebildeten Förderkanal 17 mit dem Druckraum 15 verbunden. Zudem weisen der Ansaugraum 13 und der Druckraum 15 jeweils eine Anschlußöffnung in der Wand des Pumpengehäuses 1 auf, über die der Ansaugraum 13 mit einer nicht näher dargestellten Ansaugleitung vom Vorratstank und der Druckraum 15 mit einer ebenfalls nicht dargestellten Förderleitung zum Saugraum der Kraftstoff-Einspritzpumpe verbunden ist. Dabei bildet die Anschlußöffnung in den Ansaugraum 13 eine Einlaßöffnung 19 und die Anschlußöffnung in den Druckraum 15 eine Auslaßöffnung 21. Die Pumpkammer 3 ist auf ihrer einen stirnseitigen Achsrichtung der Welle 5 und Achse 11 von einem Gehäusedeckel 23 verschlossen, der in der Darstellung der Fig. 2 abgenommen wurde und so eine Ansicht des Pumpeninneren ermöglicht.1 to 3 is a in different views Fuel feed pump shown in a not illustrated feed line from a storage tank to one Fuel injection pump used for internal combustion engines is. The fuel delivery pump has in its housing 1 a pump chamber 3, into which a rotatingly driven A pair of meshing gears 7, 9 is arranged. A first gear wheel 7 fastened to a shaft 5 is thereby driven by means of a drive element 8 and transmits this rotary movement by means of a spur toothing to a second gear 9 meshing with the first gear 7, which is arranged on a housing-mounted axis 11. The Gears 7, 9 divide the pump chamber 3 by their Tooth mesh in two parts, a first part one Intake chamber 13 and a second part form a pressure chamber 15. The suction chamber 13 is one between each Tooth grooves on the end faces of the first gear 7 and second gear 9 and the peripheral wall of the pump chamber 3rd formed delivery channel 17 connected to the pressure chamber 15. In addition, the suction chamber 13 and the pressure chamber 15 each have a connection opening in the wall of the pump housing 1, through which the suction space 13 with a no closer shown suction line from the storage tank and the pressure chamber 15 with a feed line, also not shown, for Suction chamber of the fuel injection pump is connected. there forms the connection opening in the suction chamber 13 a Inlet opening 19 and the connection opening in the pressure chamber 15 an outlet opening 21. The pump chamber 3 is on one of them frontal axis direction of the shaft 5 and axis 11 of one Closed cover 23, which in the representation of the Fig. 2 was removed and so a view of the pump interior allows.

In dem Ansaugraum 13 ist ein Filterelement 26 angeordnet, das die Einlaßöffnung 19 zum Förderkanal 17 trennt. Das Filterelement 26 ist unter Vorspannung in den Ansaugraum 13 eingesetzt und liegt mit einer das Filterelement 26 umfassenden Dichtung 27 in einer Aufnahme 28 des Ansaugraums 13 an. Durch die Vorspannung kann erzielt werden, daß bei einem sich erwärmenden Gehäuse 1 während des Betriebes der Kraftstoff-Förderpumpe das Filterelement 26 mit seiner Dichtung 27 in den dafür vorgesehenen Aufnahmen 28 im Ansaugraum 13 anliegen.A filter element 26 is arranged in the suction space 13 separates the inlet opening 19 to the delivery channel 17. The Filter element 26 is pre-stressed in suction space 13 used and lies with the filter element 26 comprehensive seal 27 in a receptacle 28 of the suction space 13 on. The bias can be achieved in that a warming housing 1 during operation of the Fuel delivery pump the filter element 26 with its Seal 27 in the designated receptacles 28 in Suction chamber 13 abut.

Das Filterelement 26 ist als flächiges Gebilde ausgebildet und weist eine gemäß Fig. 2 dargestellte Querschnittsform auf, damit eine in dem Gehäuse 1 angeordnete Öffnung 29, in der ein Rückschlagventil angeordnet sein kann, ausgespart ist. Alternativ kann auch vorgesehen sein, daß das Filterelement 26 ein räumliches Gebilde mit einer gekrümmten Oberfläche aufweist. Damit ein leichtes Einsetzen und Auswechseln des Filterelementes 26 gegeben ist, ist die obere und untere Dichtfläche geradlinig ausgebildet, so daß das Filterelement 26 in den Ansaugraum 13 eingeschoben werden kann.The filter element 26 is designed as a flat structure and has a cross-sectional shape shown in FIG. 2 so that an arranged in the housing 1 opening 29, in a check valve can be arranged, recessed is. Alternatively, it can also be provided that the Filter element 26 is a spatial structure with a curved Surface. So that an easy insertion and The filter element 26 is replaced, the upper one and lower sealing surface formed straight, so that the Filter element 26 are inserted into the suction space 13 can.

In einem unteren Bereich des Ansaugraumes 13 ist ein Sammelraum 31 vorgesehen. Die in dem zugeführten Kraftstoff mitgeführten Partikel werden von dem Filterelement 26 zurückgehalten und setzen sich in dem Absetzraum 31 ab.In a lower area of the suction space 13 is a Collection space 31 is provided. The in the fuel supplied entrained particles are carried by the filter element 26 retained and settle in the settling room 31.

In einer Gehäusewand 32 des Gehäuses 1 ist eine Öffnung 33 vorgesehen, durch die der Sammelraum 31 von außen zugänglich ist. Die Öffnung 33 ist durch ein Sichtfenster 34 flüssigkeitsdicht verschlossen, so daß eine einfache Sichtkontrolle möglich ist.An opening 33 is in a housing wall 32 of the housing 1 provided through which the collecting space 31 is accessible from the outside is. The opening 33 is through a viewing window 34 sealed liquid-tight, so that a simple Visual inspection is possible.

Das Filterelement 26 kann in Abhängigkeit des Anwendungsfalles eine unterschiedliche Maschenweite aufweisen. Die Maschenweite des Filterelementes 26 steht desweiteren in Relation zur Größe des in den Ansaugraum 13 einsetzbaren Filterelementes, damit eine Drosselwirkung durch das Filterelement 26 vermieden werden kann. Bei einem Filterelement 26, wie in Fig. 2 dargestellt, kann die Maschenweite relativ klein ausgebildet sein, da ein großer Durchflußquerschnitt zur Verfügung steht. Alternativ kann vorgesehen sein, daß das Filterelement in der Einlaßöffnung 19 eingesetzt ist, wobei hier die Maschenweite größer ausgebildet sein kann. Desweiteren kann die Maschenweite des Filterelementes an den Anwendungsfall angepaßt sein, so daß beispielsweise bei Tieftemperaturen ein Verlegen des Filters durch Ausflockung von Dieselkraftstoff verhindert werden kann. Beispielsweise kann für den Einsatz von Baustellenfahrzeugen vorgesehen sein, daß ein relativ engmaschiges Filterelement 26 eingesetzt wird, um Staubpartikel herausfiltern zu können.The filter element 26 can, depending on the Use a different mesh size exhibit. The mesh size of the filter element 26 is furthermore in relation to the size of the intake chamber 13 usable filter element, so that a throttling effect the filter element 26 can be avoided. At a Filter element 26, as shown in Fig. 2, the Mesh size should be made relatively small because of a large one Flow cross section is available. Alternatively, you can be provided that the filter element in the inlet opening 19 is used, the mesh size being larger here can be trained. Furthermore, the mesh size of the Filter element to be adapted to the application, so that for example at low temperatures, relocating the filter can be prevented by flocculation of diesel fuel can. For example, for the use of Construction site vehicles should be provided that a relative close-meshed filter element 26 is used to To be able to filter out dust particles.

Der Zeitpunkt für die Reinigung der Kraftstoff-Förderpumpe kann über die Betriebsdauer oder über eine optische Kontrolle des Sammelraumes 31 überwacht werden. Die Reinigung des Filterelementes 26 kann dadurch erfolgen, daß das Gehäuse 1 entgegen der Kraftstoff-Förderrichtung ausgeblasen wird, so daß sich die in dem Filterelement 26 hängengebliebenen Partikel aus dem Filterelement 26 lösen können. Diese können sich nach dem Ausblasen in dem Sammelraum 31 absetzen, der über die Öffnung 31 zugänglich ist, so daß die hängengebliebenen Partikel abgesaugt werden können.The time for cleaning the fuel delivery pump can over the operating time or via an optical control of the collecting room 31 are monitored. The cleaning of the Filter element 26 can be made in that the housing 1st is blown against the fuel delivery direction, so that the stuck in the filter element 26 Can release particles from the filter element 26. these can after blowing out settle in the collecting space 31, the is accessible via the opening 31 so that the stuck particles can be extracted.

Desweiteren kann für den Filterwechsel der Gehäusedeckel 23 abgenommen werden und das Filterelement 26 aus dem Ansaugraum 13 herausgenommen werden. Gleichzeitig kann der Sammelraum 31 gereinigt werden. Anschließend wird das neue Filterelement 26 wieder in den Sammelraum 31 eingesetzt und mit dem Gehäusedeckel 23 verschlossen. Dafür ist lediglich eine Montage und Demontage von vier Deckelschrauben erforderlich, so daß ein schneller und einfacher Filterwechsel und eine Reinigung des Sammelraumes 31 erfolgen kann. Furthermore, the housing cover 23 be removed and the filter element 26 from the suction chamber 13 can be removed. At the same time, the collecting space 31 getting cleaned. Then the new filter element 26 reinstalled in the collection room 31 and with the Housing cover 23 closed. There is only one Assembly and disassembly of four cover screws required so that a quick and easy filter change and one Cleaning of the collecting space 31 can take place.

Die Ausführungen für das in dem Ansaugraum 13 angeordnete Filterelement 26 können ebenso für ein in dem Druckraum 15 angeordnetes Filterelement 26 gelten.The designs for that arranged in the suction space 13 Filter element 26 can also be used in the pressure chamber 15 arranged filter element 26 apply.

Desweiteren kann alternativ vorgesehen sein, daß zur Anordnung des Filterelementes 26 unter Vorspannung in dem Ansaugraum 13 ein zusätzliches Federelement vorgesehen sein kann, so daß die Vorspannung in Längsrichtung aufgebracht werden kann.Furthermore, it can alternatively be provided that for Arrangement of the filter element 26 under tension in the Intake chamber 13, an additional spring element can be provided can, so that the bias is applied in the longitudinal direction can be.

Claims (8)

  1. Fuel feed pump for a fuel injection pump for internal combustion engines, having a pair of gear wheels (7, 9) which are driven in rotation in a pump chamber (3), intermesh with one another and feed fuel from an intake space (13) connected to a reservoir tank, along a feed duct (17) formed between the end face of the gear wheels (7, 9) and the circumference wall of the pump chamber (3) and into a pressure space (15) connected to the fuel injection pump, at least one filter element (26) being integrated into the housing of the fuel feed pump, characterized in that the filter element (26) which is embodied as a flat filter sieve is inserted into the housing (1) with prestress and fits into a receptacle (28) of the housing (1) via a seal (27) that surrounds the filter element (26).
  2. Fuel feed pump according to Claim 1, characterized in that at least one filter element (26) is integrated into the intake space (13).
  3. Fuel feed pump according to Claim 1 or 2, characterized in that at least one filter element (26) is integrated into the pressure space (15).
  4. Fuel feed pump according to one of the preceding claims, characterized in that a collecting space (31) is provided in a lower region of the intake space (13) upstream, viewed in the feeding direction of the fuel, of the filter element (26) arranged therein.
  5. Fuel feed pump according to Claim 4, characterized in that an opening (33) which leads to the collecting space (31) is provided in a housing wall (32) of the housing (1).
  6. Fuel feed pump according to Claim 5, characterized in that a transparent closure (34) is provided in the opening (33).
  7. Fuel feed pump according to Claim 1, characterized in that the filter element (26) can be inserted with a spring element into the housing (1) with prestress.
  8. Fuel feed pump according to Claim 1, characterized in that a seal (27) which surrounds the filter element (26) is provided and can be inserted into a receptacle (28) of the housing (1).
EP97100912A 1996-06-27 1997-01-22 Fuel transfer pump for a fuel injection pump for an engine Expired - Lifetime EP0816669B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19625736A DE19625736C2 (en) 1996-06-27 1996-06-27 Fuel feed pump for a fuel injection pump for internal combustion engines
DE19625736 1996-06-27

Publications (3)

Publication Number Publication Date
EP0816669A2 EP0816669A2 (en) 1998-01-07
EP0816669A3 EP0816669A3 (en) 1998-04-15
EP0816669B1 true EP0816669B1 (en) 2002-07-03

Family

ID=7798173

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97100912A Expired - Lifetime EP0816669B1 (en) 1996-06-27 1997-01-22 Fuel transfer pump for a fuel injection pump for an engine

Country Status (3)

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EP (1) EP0816669B1 (en)
BR (1) BR9703744A (en)
DE (2) DE19625736C2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2338990A (en) * 1998-06-30 2000-01-12 Cummins Engine Co Ltd Fuel pump and filter assembly for an engine
DE19858610C1 (en) * 1998-12-18 2001-02-15 Solar Diamant Systemtechnik Gm Controller for displacement pump, especially gear wheel pump, has reversing circuit for operation in event of blockage of pump by particles entering system to free particle

Family Cites Families (15)

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Publication number Priority date Publication date Assignee Title
US1132747A (en) * 1910-02-18 1915-03-23 Otis Elevator Co Rotary gear-pump.
US1780217A (en) * 1927-08-25 1930-11-04 Wiltse Appliance Co Pump mechanism
GB384164A (en) * 1931-04-03 1932-12-01 Tecalemit Ltd Improvements relating to pumps, and particularly to fuel pumps for internal combustion engines
US2024133A (en) * 1932-07-27 1935-12-10 Boeing Co Fuel handling unit
US2348567A (en) * 1941-01-10 1944-05-09 Parker Appliance Co Fuel pumping unit
GB569769A (en) * 1942-08-31 1945-06-07 Gen Motors Corp Improvements in fuel supply systems for internal combustion engines
DE1083656B (en) * 1954-02-04 1960-06-15 Webster Electric Co Inc Rotary lobe pump
US3695438A (en) * 1969-07-19 1972-10-03 Alberto Malpassi Gasoline pressure regulator device
US3622007A (en) * 1969-07-24 1971-11-23 Gen Metal Products Corp Fuel filter
DE1947505A1 (en) * 1969-09-19 1971-06-16 Bosch Gmbh Robert Suspension device for an electric fuel pump
US4631009A (en) * 1984-07-18 1986-12-23 Sundstrand Corporation Lubrication scavenge system
US4740140A (en) * 1985-12-11 1988-04-26 Sundstrand Corporation Pump having integral switch and bypass valve
DE3718068C1 (en) * 1987-05-29 1988-06-30 Daimler Benz Ag Rod-shaped gauze filter for installation in the flow path of a fuel supply
US5007806A (en) * 1989-03-30 1991-04-16 Mallory, Inc. Fuel pump
DE4441505A1 (en) * 1994-11-22 1996-05-23 Bosch Gmbh Robert Fuel feed pump for a fuel injection pump for internal combustion engines

Also Published As

Publication number Publication date
EP0816669A2 (en) 1998-01-07
DE19625736A1 (en) 1998-01-08
EP0816669A3 (en) 1998-04-15
BR9703744A (en) 1998-08-11
DE19625736C2 (en) 2000-07-27
DE59707627D1 (en) 2002-08-08

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