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 PDFInfo
- 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
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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
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
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.
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.
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.
- 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.
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
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
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
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
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
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
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
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
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
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
Claims (8)
- 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).
- Fuel feed pump according to Claim 1, characterized in that at least one filter element (26) is integrated into the intake space (13).
- 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).
- 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.
- 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).
- Fuel feed pump according to Claim 5, characterized in that a transparent closure (34) is provided in the opening (33).
- 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.
- 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).
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)
Country | Link |
---|---|
EP (1) | EP0816669B1 (en) |
BR (1) | BR9703744A (en) |
DE (2) | DE19625736C2 (en) |
Families Citing this family (2)
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)
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 |
-
1996
- 1996-06-27 DE DE19625736A patent/DE19625736C2/en not_active Expired - Fee Related
-
1997
- 1997-01-22 EP EP97100912A patent/EP0816669B1/en not_active Expired - Lifetime
- 1997-01-22 DE DE59707627T patent/DE59707627D1/en not_active Expired - Fee Related
- 1997-06-27 BR BR9703744A patent/BR9703744A/en not_active IP Right Cessation
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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