EP0846228B1 - Fuel supply pump for a fuel injection pump for internal combustion engines - Google Patents

Fuel supply pump for a fuel injection pump for internal combustion engines Download PDF

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Publication number
EP0846228B1
EP0846228B1 EP97914123A EP97914123A EP0846228B1 EP 0846228 B1 EP0846228 B1 EP 0846228B1 EP 97914123 A EP97914123 A EP 97914123A EP 97914123 A EP97914123 A EP 97914123A EP 0846228 B1 EP0846228 B1 EP 0846228B1
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EP
European Patent Office
Prior art keywords
fuel
valve
venting device
duct
space
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
EP97914123A
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German (de)
French (fr)
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EP0846228A1 (en
Inventor
Stanislaw Bodzak
Hanspeter Mayer
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP0846228A1 publication Critical patent/EP0846228A1/en
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    • 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
    • F02M37/20—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 characterised by means for preventing vapour lock
    • 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
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/06—Venting
    • 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
    • F04C13/007—Venting; Gas and vapour separation during pumping

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 face of 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 Axis attacking drive element is driven in rotation.
  • 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 second housing-bearing axis is arranged.
  • GB 850 518 is a feed pump for liquids known that a rotating driven pair with each other meshing gears, the liquid along a between the end faces of the gears and the peripheral wall the pump chamber receiving the gears Funding channel promotes.
  • This known pump serves as Pressure generator for an actuator that after a Working cycle of the pump on its suction side again becomes.
  • the suction and pressure side of this pump is over Check valves connected to an expansion tank.
  • a dry fuel delivery pump may be required be that a ventilation of a pipe system as well Pump chamber is required immediately after Commissioning of the fuel internal combustion engine quick pressure build-up and fuel delivery can.
  • the fuel delivery pump according to the invention for a Fuel injection pump for internal combustion engines has the Advantage on that by a in the intake chamber with the Channel connecting pressure chamber can be used Venting device a venting of the fuel delivery pump is possible. It is upstream and downstream the venting device in each case at least one pressure valve provided which are arranged such that by the Venting device a directed flow, that leads from the intake space to the pressure space, generated is, so that a venting of the fuel delivery pump can be achieved.
  • a housing cover of the fuel delivery pump the one connecting the suction chamber with the pressure chamber Channel is arranged in which the ventilation device can be used.
  • the ventilation device can be used in which the ventilation device can be used.
  • upstream and downstream of the Venting device can each be arranged a pressure valve is. This can be done in one valve compartment of the channel be arranged such that when the Vent the upstream of the Bleeding device closes pressure valve and that Pressure valve arranged downstream of the ventilation device opens up towards the pressure chamber. This allows a certain and directional flow can be achieved to the pumping chamber to be able to vent.
  • the upstream of the venting device arranged pressure valve in one of a storage tank for Fuel feed pump leading fuel line is. This in turn can result in a directed flow in Direction fuel injection pump can be achieved because that in the fuel line arranged pressure valve upstream to Storage tank closes.
  • the ventilation device in a Opening the housing can be used.
  • This Venting device can be used if necessary or permanently be used.
  • the device is advantageously vented through a closing valve provided in the opening or Closing element lockable.
  • FIGS. 1 to 4 are different views of a Fuel feed pump 10 shown in a not shown feed line from a storage tank to a Fuel injection pump used for internal combustion engines is.
  • the feed pump 10 has in its housing 1 Pump chamber 3 in which a rotatingly driven pair intermeshing gears is arranged. Doing so a first gear wheel 7 fastened on a shaft 5 by means of a drive element 8 driven and transmits them Rotational movement on a meshing with the first gear 7 second gear 9, which on a housing-mounted axis 11th is arranged.
  • the gears 7, 9 share the Pump chamber 3 by their tooth engagement in two parts, from which a first part a suction space 13 and a second Form part of a pressure chamber 15.
  • the suction chamber 13 is there one each between the tooth grooves on the end faces of the first gear 7 and the second gear 9 and Circumferential wall of the pump chamber 3 formed with delivery channel 17 connected to the pressure chamber 15.
  • the suction space 13 and the pressure chamber 15 each have a connection opening in a Wall of the pump housing 1 through which the suction chamber 13 with a suction line from the storage tank, not shown and the pressure chamber 15 with a likewise not shown Delivery line to the suction chamber of the fuel injection pump connected is.
  • the connection opening forms in the Intake chamber 13, an inlet opening 19 and the connection opening an outlet opening 21 in the pressure chamber 15.
  • the pump chamber 3 is on one end face in the axial direction of the shaft 5 and the axis 11 closed by a housing cover 23, the was removed in the illustration of FIG. 2 and so one Allows a view of the pump interior.
  • a suction chamber 13 with the Channel 26 connecting pressure chamber 15 is provided, the one Has opening 27 into which a venting device 28 can be used.
  • a Bore section 31 provided with a valve chamber 32, in which a pressure valve 33 is arranged.
  • a second bore section 36 is provided, which a in a pressure chamber 38 arranged in a valve chamber 37.
  • the Pressure valves 33 and 38 are advantageously as Check valves formed and arranged such that the Pressure valve 33 when channel 26 is pressurized closes via the ventilation device 28 to the suction chamber 13 and the pressure valve 38 to the pressure chamber 15 opens. This can create a directional flow, such as will be explained below.
  • the venting device 28 is in the embodiment as Hand pump trained. This has a grip cap 41, by actuating them a certain volume of air in the duct 26 can be supplied.
  • the venting device is advantageously temperature and vibration resistant trained and can, if necessary, in the opening 27 are used or in this opening 27 constantly be arranged. Alternatively, it can be provided that a motor-operated ventilation device into the opening 27 can be used and arranged.
  • a closing valve is provided or a Cap can be used so that when not in use Venting device 28 the channel 26 is closed.
  • FIG. 5 is a circuit diagram of that in FIGS. 1 to 4 illustrated embodiment shown.
  • a check valve 52 is arranged in the fuel line 51, this avoids the fuel in the storage tank is pushed back.
  • the fuel is in the direction of the arrow fed to the fuel delivery pump, the fuel for Fuel injection pump in the direction of the arrow from left to promotes right.
  • the channel 26 is arranged with the venting device 28. That is upstream and downstream of the venting device 28 Pressure valve 33 and 38 arranged.
  • FIG. 6 is a circuit diagram of an alternative Embodiment to Fig. 5 shown. It is provided that the pressure valve 33 is arranged in the fuel line 51 is. Furthermore, the ventilation device 28 is located downstream the pressure valve 38 is provided so that in turn a certain Air volume 53 can be displaced. By arranging the Pressure valve 33 in the fuel line 51 can be avoided be that the displaced air volume in the Fuel line 51 is pushed back.
  • FIG. 7 shows an alternative embodiment to FIG. 1 shown to 4.
  • the vent device 28 is for example at an angle of 45 ° to axis 61 inclined.
  • the angled arrangement of the venting device 28 to the housing cover 23 may be available depending on the standing space as well in another suitable Angular position may be provided. This can be achieved that good accessibility for the onset of the Venting device 28 is given in the opening 27.
  • Venting device 28 may be facilitated.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Fuel-Injection Apparatus (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 Achse 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 zweiten gehäusegelagerten Achse angeordnet ist. 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 face of 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 Axis attacking drive element is driven in rotation. 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 second housing-bearing axis is arranged.

Durch die GB 850 518 ist eine Förderpumpe für Flüssigkeiten bekannt, die ein rotierend angetriebenes Paar miteinander kämmender Zahnräder aufweist, die Flüssigkeit entlang einem zwischen der Stirnflächen der Zahnräder und der Umfangswand der die Zahnräder aufnehmender Pumpenkammer gebildeten Förderkanal fördert. Diese bekannte Pumpe dient als Druckerzeuger für ein Stellmittel, das nach einem Arbeitstakt der Pumpe auf ihrer Saugseite wiederzugeführt wird. Die Saug- und Druckseite dieser Pumpe ist über Rückschlagventile mit einem Ausgleichsbehälter verbunden.GB 850 518 is a feed pump for liquids known that a rotating driven pair with each other meshing gears, the liquid along a between the end faces of the gears and the peripheral wall the pump chamber receiving the gears Funding channel promotes. This known pump serves as Pressure generator for an actuator that after a Working cycle of the pump on its suction side again becomes. The suction and pressure side of this pump is over Check valves connected to an expansion tank.

Für eine erste Betriebnahme der Brennkraftmaschine oder bei einem Austausch einer Kraftstoff-Förderpumpe als auch bei einer trockenen Kraftstoff-Förderpumpe kann es erforderlich sein, daß eine Entlüftung eines Leitungssystems als auch der Pumpkammer erforderlich ist, damit unmittelbar nach Inbetriebnahme der Kraftstoff-Brennkraftmaschine ein schneller Druckaufbau und eine Kraftstoff-Förderung erfolgen kann.For a first commissioning of the internal combustion engine or at an exchange of a fuel delivery pump as well a dry fuel delivery pump may be required be that a ventilation of a pipe system as well Pump chamber is required immediately after Commissioning of the fuel internal combustion engine quick pressure build-up and fuel delivery can.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Kraftstoff-Förderpumpe für eine Kraftstoff-Einspritzpumpe für Brennkraftmaschinen weist den Vorteil auf, daß durch eine in einen den Ansaugraum mit dem Druckraum verbindenden Kanal einsetzbare Entlüftungsvorrichtung eine Entlüftung der Kraftstoff-Förderpumpe ermöglicht ist. Dafür ist stromauf und stromab der Entlüftungsvorrichtung jeweils zumindest ein Druckventil vorgesehen, die derart angeordnet sind, daß durch die Entlüftungsvorrichtung eine gerichtete Strömung, die von Ansaugraum zur Druckraum führt, erzeugt wird, so daß eine Entlüftung der Kraftstoff-Förderpumpe erzielt werden kann.The fuel delivery pump according to the invention for a Fuel injection pump for internal combustion engines has the Advantage on that by a in the intake chamber with the Channel connecting pressure chamber can be used Venting device a venting of the fuel delivery pump is possible. It is upstream and downstream the venting device in each case at least one pressure valve provided which are arranged such that by the Venting device a directed flow, that leads from the intake space to the pressure space, generated is, so that a venting of the fuel delivery pump can be achieved.

Nach einer vorteilhaften Ausgestaltung der Erfindung ist vorgesehen, daß in einem Gehäusedeckel der Kraftstoff-Förderpumpe der den Ansaugraum mit dem Druckraum verbindende Kanal angeordnet ist, in den die Entlüftungsvorrichtung einsetzbar ist. Dadurch kann eine platzsparende Anordnung geschaffen sein. Vorteilhafterweise ist vorgesehen, daß in dem Gehäusedeckel stromauf und stromab der Entlüftungsvorrichtung jeweils ein Druckventil anordenbar ist. Dieses kann in jeweils einem Ventilraum des Kanals derart angeordnet sein, daß bei der Betätigung der Entlüftungsvorrichtung das stromauf der Entlüftungsvorrichtung liegende Druckventil schließt und das stromab der Entlüftungsvorrichtung angeordnete Druckventil sich zum Druckraum hin öffnet. Dadurch kann eine bestimmte und gerichtete Strömung erzielt werden, um die Pumpkammer entlüften zu können.According to an advantageous embodiment of the invention provided that in a housing cover of the fuel delivery pump the one connecting the suction chamber with the pressure chamber Channel is arranged in which the ventilation device can be used. This allows a space-saving arrangement be created. It is advantageously provided that in the housing cover upstream and downstream of the Venting device can each be arranged a pressure valve is. This can be done in one valve compartment of the channel be arranged such that when the Vent the upstream of the Bleeding device closes pressure valve and that Pressure valve arranged downstream of the ventilation device opens up towards the pressure chamber. This allows a certain and directional flow can be achieved to the pumping chamber to be able to vent.

Nach einer weiteren vorteilhaften Ausgestaltung der Erfindung ist vorgesehen, daß das stromauf der Entlüftungsvorrichtung angeordnete Druckventil in einer von einem Vorratstank zur Kraftstoff-Förderpumpe führenden Kraftstoffleitung vorgesehen ist. Dadurch kann wiederum eine gerichtete Strömung in Richtung Kraftstoff-Einspritzpumpe erzielt werden, da das in der Kraftstoffleitung angeordnete Druckventil stromauf zum Vorratstank schließt.According to a further advantageous embodiment of the invention it is provided that the upstream of the venting device arranged pressure valve in one of a storage tank for Fuel feed pump leading fuel line provided is. This in turn can result in a directed flow in Direction fuel injection pump can be achieved because that in the fuel line arranged pressure valve upstream to Storage tank closes.

Nach einer weiteren vorteilhaften Ausgestaltung der Erfindung ist vorgesehen, daß die Entlüftungsvorrichtung in eine Öffnung des Gehäuses einsetzbar ist. Diese Entlüftungsvorrichtung kann im Bedarfsfall oder dauerhaft eingesetzt sein. Bei nicht eingesetzter Entlüftungsvorrichtung ist der Kanal vorteilhafterweise durch ein in der Öffnung vorgesehenes Schließventil oder Verschlußelement verschließbar.According to a further advantageous embodiment of the invention it is provided that the ventilation device in a Opening the housing can be used. This Venting device can be used if necessary or permanently be used. When not in use The device is advantageously vented through a closing valve provided in the opening or Closing element lockable.

Weitere Vorteile und vorteilhafte Ausgestaltungen des Gegenstandes der Erfindung sind der Beschreibung, der Zeichnung und den Patentansprüchen entnehmbar. Further advantages and advantageous configurations of the The invention relates to the description of Drawing and the claims can be found.

Zeichnungdrawing

In der Zeichnung sind bevorzugte Ausführungsbeispiele der erfindungsgemäßen Kraftstoff-Förderpumpe dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen:

Fig. 1
einen Längsschnitt durch die Kraftstoff-Förderpumpe entlang der Linie I-I von Fig. 2,
Fig. 2
eine Draufsicht auf die in Fig. 1 dargestellte Kraftstoff-Förderpumpe mit abgenommenem Gehäusedeckel,
Fig. 3
eine Seitenansicht auf die in Fig. 1 dargestellte Kraftstoff-Förderpumpe gemäß Pfeilrichtung 9,
Fig. 4
einen Längsschnitt durch einen Gehäusedeckel der Kraftstoff-Förderpumpe entlang der Linie IV-IV von Fig. 1,
Fig. 5
eine Prinzipskizze einer Schaltungsanordnung gemäß der Kraftstoff-Förderpumpe in Fig. 5,
Fig. 6
eine Prinzipskizze einer alternativen Schaltungsanordnung zu Fig. 4 und
Fig. 7
eine alternative Ausführungsform einer an dem Gehäusedeckel angeordneten Entlüftungsvorrichtung.
In the drawing, preferred embodiments of the fuel delivery pump according to the invention are shown and explained in more detail in the following description. Show it:
Fig. 1
2 shows a longitudinal section through the fuel feed pump along line II of FIG. 2,
Fig. 2
2 shows a top view of the fuel feed pump shown in FIG. 1 with the housing cover removed,
Fig. 3
2 shows a side view of the fuel feed pump shown in FIG. 1 in the direction of arrow 9,
Fig. 4
2 shows a longitudinal section through a housing cover of the fuel delivery pump along the line IV-IV of FIG. 1,
Fig. 5
5 shows a schematic diagram of a circuit arrangement according to the fuel delivery pump in FIG. 5,
Fig. 6
a schematic diagram of an alternative circuit arrangement to Fig. 4 and
Fig. 7
an alternative embodiment of a ventilation device arranged on the housing cover.

Beschreibung der AusführungsbeispieleDescription of the embodiments

In den Fig. 1 bis 4 sind verschiedene Ansichten einer Kraftstoff-Förderpumpe 10 dargestellt, die in einer nicht dargestellten Zulaufleitung von einem Vorratstank zu einer Kraftstoff-Einspritzpumpe für Brennkraftmaschinen eingesetzt ist. Dabei weist die Förderpumpe 10 in ihrem Gehäuse 1 eine Pumpkammer 3 auf, in der ein rotierend angetriebenes Paar miteinander kämmender Zahnräder angeordnet ist. Dabei wird ein auf einer Welle 5 befestigtes erstes Zahnrad 7 mittels eines Antriebselementes 8 angetrieben und überträgt diese Drehbewegung 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 eine 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 Stirnseite in Achsrichtung der Wellen 5 und der 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 4 are different views of a Fuel feed pump 10 shown in a not shown feed line from a storage tank to a Fuel injection pump used for internal combustion engines is. The feed pump 10 has in its housing 1 Pump chamber 3 in which a rotatingly driven pair intermeshing gears is arranged. Doing so a first gear wheel 7 fastened on a shaft 5 by means of a drive element 8 driven and transmits them Rotational movement on a meshing with the first gear 7 second gear 9, which on a housing-mounted axis 11th is arranged. The gears 7, 9 share the Pump chamber 3 by their tooth engagement in two parts, from which a first part a suction space 13 and a second Form part of a pressure chamber 15. The suction chamber 13 is there one each between the tooth grooves on the end faces of the first gear 7 and the second gear 9 and Circumferential wall of the pump chamber 3 formed with delivery channel 17 connected to the pressure chamber 15. In addition, the suction space 13 and the pressure chamber 15 each have a connection opening in a Wall of the pump housing 1 through which the suction chamber 13 with a suction line from the storage tank, not shown and the pressure chamber 15 with a likewise not shown Delivery line to the suction chamber of the fuel injection pump connected is. The connection opening forms in the Intake chamber 13, an inlet opening 19 and the connection opening an outlet opening 21 in the pressure chamber 15. The pump chamber 3 is on one end face in the axial direction of the shaft 5 and the axis 11 closed by a housing cover 23, the was removed in the illustration of FIG. 2 and so one Allows a view of the pump interior.

In dem Gehäusedeckel 23 ist ein den Ansaugraum 13 mit dem Druckraum 15 verbindender Kanal 26 vorgesehen, der eine Öffnung 27 aufweist, in die eine Entlüftungsvorrichtung 28 einsetzbar ist. Stromauf der Öffnung 27 ist ein Bohrungsabschnitt 31 mit einem Ventilraum 32 vorgesehen, in dem ein Druckventil 33 angeordnet ist. Stromab der Öffnung 27 ist ein zweiter Bohrungsabschnitt 36 vorgesehen, der ein in einem Ventilraum 37 angeordnetes Druckventil 38 aufweist. Die Druckventile 33 und 38 sind vorteilhafterweise als Rückschlagventile ausgebildet und derart angeordnet, daß das Druckventil 33 bei einer Druckbeaufschlagung des Kanals 26 über die Entlüftungsvorrichtung 28 zum Ansaugraum 13 schließt und das Druckventil 38 zum Druckraum 15 hin sich öffnet. Dadurch kann eine gerichtete Strömung erzeugt werden, wie nachfolgend noch ausgeführt sein wird.In the housing cover 23 is a suction chamber 13 with the Channel 26 connecting pressure chamber 15 is provided, the one Has opening 27 into which a venting device 28 can be used. Upstream of the opening 27 is a Bore section 31 provided with a valve chamber 32, in which a pressure valve 33 is arranged. Downstream of opening 27 a second bore section 36 is provided, which a in a pressure chamber 38 arranged in a valve chamber 37. The Pressure valves 33 and 38 are advantageously as Check valves formed and arranged such that the Pressure valve 33 when channel 26 is pressurized closes via the ventilation device 28 to the suction chamber 13 and the pressure valve 38 to the pressure chamber 15 opens. This can create a directional flow, such as will be explained below.

Die Entflüftungsvorrichtung 28 ist im Ausführungsbeispiel als Handpumpe ausgebildet. Diese weist eine Griffkappe 41 auf, durch deren Betätigung ein bestimmtes Luftvolumen dem Kanal 26 zugeführt werden kann. Die Entlüftungsvorrichtung ist vorteilhafterweise temperatur- und schwingungsbeständig ausgebildet und kann im Bedarfsfall in die Öffnung 27 eingesetzt werden oder in dieser Öffnung 27 ständig angeordnet sein. Alternativ kann vorgesehen sein, daß eine motorisch betriebene Entlüftungsvorrichtung in die Öffnung 27 einsetzbar und anordenbar ist. In der Öffnung 27 ist vorteilhafterweise ein Schließventil vorgesehen oder eine Verschlußkappe einsetzbar, so daß bei nicht eingesetzter Entlüftungsvorrichtung 28 den Kanal 26 geschlossen ist.The venting device 28 is in the embodiment as Hand pump trained. This has a grip cap 41, by actuating them a certain volume of air in the duct 26 can be supplied. The venting device is advantageously temperature and vibration resistant trained and can, if necessary, in the opening 27 are used or in this opening 27 constantly be arranged. Alternatively, it can be provided that a motor-operated ventilation device into the opening 27 can be used and arranged. In the opening 27 is advantageously a closing valve is provided or a Cap can be used so that when not in use Venting device 28 the channel 26 is closed.

In Fig. 5 ist ein Schaltplan des in Fig. 1 bis 4 dargestellten Ausführungsbeispiels dargestellt. Über eine vom Vorratstank zur Kraftstoff-Förderpumpe führende Kraftstoffleitung 51 ist ein Rückschlagventil 52 angeordnet, das vermeidet, daß der Kraftstoff in den Vorratstank zurückgedrückt wird. Der Kraftstoff wird gemäß Pfeilrichtung der Kraftstoff-Förderpumpe zugeführt, die Kraftstoff zur Kraftstoff-Einspritzpumpe in Pfeilrichtung von links nach rechts fördert. Parallel zur Kraftstoff-Förderpumpe 10 ist der Kanal 26 mit der Entlüftungsvorrichtung 28 angeordnet. Stromauf und stromab der Entlüftungsvorrichtung 28 ist das Druckventil 33 und 38 angeordnet.5 is a circuit diagram of that in FIGS. 1 to 4 illustrated embodiment shown. About one of the Storage tank leading to the fuel feed pump A check valve 52 is arranged in the fuel line 51, this avoids the fuel in the storage tank is pushed back. The fuel is in the direction of the arrow fed to the fuel delivery pump, the fuel for Fuel injection pump in the direction of the arrow from left to promotes right. Is parallel to the fuel delivery pump 10 the channel 26 is arranged with the venting device 28. That is upstream and downstream of the venting device 28 Pressure valve 33 and 38 arranged.

Bei Betätigung der Entlüftungsvorrichtung 28 wird ein bestimmtes Luftvolumen 53 gemäß Fig. 4 verdrängt und aufgrund der Anordnung der Ventile 33, 38 in eine gerichtete Strömung in Richtung Kraftstoff-Einspritzpumpe gezwungen. Durch die Anordnung stromauf und stromab der Druckventile 33, 38 kann ein innerer Kreislauf zwischen der Förderpumpe 10 und dem Kanal 26 verhindert sein.When the venting device 28 is actuated, a certain air volume 53 displaced according to FIG. 4 and due the arrangement of the valves 33, 38 in a directional flow forced towards the fuel injection pump. Through the Arrangement upstream and downstream of the pressure valves 33, 38 can an internal circuit between the feed pump 10 and the Channel 26 must be prevented.

In Fig. 6 ist ein Schaltplan einer alternativen Ausführungsform zu Fig. 5 dargestellt. Dabei ist vorgesehen, daß das Druckventil 33 in der Kraftstoffleitung 51 angeordnet ist. Desweiteren ist stromab der Entlüftungsvorrichtung 28 das Druckventil 38 vorgesehen, so daß wiederum ein bestimmtes Luftvolumen 53 verdrängt werden kann. Durch die Anordnung des Druckventils 33 in der Kraftstoffleitung 51 kann vermieden werden, daß das verdrängte Luftvolumen in die Kraftstoffleitung 51 zurückgedrückt wird.6 is a circuit diagram of an alternative Embodiment to Fig. 5 shown. It is provided that the pressure valve 33 is arranged in the fuel line 51 is. Furthermore, the ventilation device 28 is located downstream the pressure valve 38 is provided so that in turn a certain Air volume 53 can be displaced. By arranging the Pressure valve 33 in the fuel line 51 can be avoided be that the displaced air volume in the Fuel line 51 is pushed back.

In Fig. 7 ist eine alternative Ausführungsform zu den Fig. 1 bis 4 dargestellt. Die Entlüftungsvorrichtung 28 ist beispielsweise unter einem Winkel von 45° zur Achse 61 geneigt. Die winklige Anordnung der Entlüftungsvorrichtung 28 zum Gehäusedeckel 23 kann in Abhängigkeit des zur Verfügung stehenden Bauraumes ebenso in einer weiteren geeigneten Winkelposition vorgesehen sein. Dadurch kann erzielt werden, daß eine gute Zugänglichkeit für das Einsetzen der Entlüftungsvorrichtung 28 in die Öffnung 27 gegeben ist. FIG. 7 shows an alternative embodiment to FIG. 1 shown to 4. The vent device 28 is for example at an angle of 45 ° to axis 61 inclined. The angled arrangement of the venting device 28 to the housing cover 23 may be available depending on the standing space as well in another suitable Angular position may be provided. This can be achieved that good accessibility for the onset of the Venting device 28 is given in the opening 27.

Desweiteren kann die Bedienbarkeit und die Zugänglichkeit zur Entlüftungsvorrichtung 28 erleichtert sein.Furthermore, the usability and accessibility to Venting device 28 may be facilitated.

Claims (7)

  1. Fuel feed pump for a fuel injection pump for internal combustion engines, with a pair, driven in rotation in a pumping chamber (3), of intermeshing gearwheels (7, 9) which feed fuel out of an intake space (13) connected to a storage tank, along a feed duct (17) formed between the end face of the gearwheels (7, 9) and the circumferential wall of the pumping chamber (3), into a delivery space (15) connected to the fuel injection pump, characterized in that a duct (26) is provided, which connects the intake space (13) to the delivery space (15) and is connectable to a venting device (28), upstream of which an upstream-blocking delivery valve (33) and downstream of which a delivery valve (38) opening in the flow direction, for a directed flow leading from the intake space (13) to the delivery space (15), are provided in the duct (26).
  2. Fuel feed pump according to Claim 1, characterized in that the delivery valve (33) arranged upstream of the venting device (28) can be arranged in a valve space (32) of a bore portion (31) of the duct (26) and the valve (38) provided downstream of the venting device (28) can be arranged in a valve space (37) of the bore portion (36) of the duct (26).
  3. Fuel feed pump according to Claim 1, characterized in that the valve (38) provided downstream of the venting device can be arranged in a valve space (37) of a bore portion (36) in the duct (26), and in that the delivery valve (33) provided upstream of the venting device (28) can be arranged in a fuel line (51) leading from the storage tank to the fuel feed pump.
  4. Fuel feed pump according to one of the preceding claims, characterized in that the duct (26) is provided in a casing cover (23).
  5. Fuel feed pump according to Claim 1, characterized in that the venting device (28) is a hand pump.
  6. Fuel feed pump according to Claim 4, characterized in that there is provided in the casing cover (23), for receiving the venting device (28), an orifice (27) which, when the venting device (28) is not being used, has a closing valve which closes the orifice (27).
  7. Fuel feed pump according to Claim 1, characterized in that the duct (26) is provided in the casing (1).
EP97914123A 1996-06-26 1997-02-06 Fuel supply pump for a fuel injection pump for internal combustion engines Expired - Lifetime EP0846228B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19625567 1996-06-26
DE19625567A DE19625567C2 (en) 1996-06-26 1996-06-26 Fuel feed pump for a fuel injection pump for internal combustion engines
PCT/DE1997/000221 WO1997049916A1 (en) 1996-06-26 1997-02-06 Fuel supply pump for a fuel injection pump for internal combustion engines

Publications (2)

Publication Number Publication Date
EP0846228A1 EP0846228A1 (en) 1998-06-10
EP0846228B1 true EP0846228B1 (en) 2001-10-04

Family

ID=7798074

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97914123A Expired - Lifetime EP0846228B1 (en) 1996-06-26 1997-02-06 Fuel supply pump for a fuel injection pump for internal combustion engines

Country Status (5)

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US (1) US6186746B1 (en)
EP (1) EP0846228B1 (en)
CZ (1) CZ289388B6 (en)
DE (2) DE19625567C2 (en)
WO (1) WO1997049916A1 (en)

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DE19714648B4 (en) * 1997-04-09 2005-06-30 Robert Bosch Gmbh Fuel feed pump
DE19858084C1 (en) * 1998-12-16 2000-04-20 Siemens Ag Injection system with common rail high pressure pump, especially for vehicle internal combustion engine
AU2001262040A1 (en) * 2000-04-18 2001-10-30 Luk Fahrzeug-Hydraulik Gmbh And Co. Kg Pump
GB0116810D0 (en) * 2001-07-10 2001-08-29 Delphi Tech Inc Electrical connection system
US6837751B2 (en) * 2002-07-25 2005-01-04 Delphi Technologies, Inc. Electrical connector incorporating terminals having ultrasonically welded wires
US6773240B2 (en) 2002-01-28 2004-08-10 Visteon Global Technologies, Inc. Single piston dual chamber fuel pump
FR2948731B1 (en) * 2009-07-29 2014-05-09 Peugeot Citroen Automobiles Sa DEVICE AND METHOD FOR STARTING A FUEL CIRCUIT OF A COMBUSTION ENGINE
CN104260013B (en) * 2014-09-23 2016-08-24 苏州农业职业技术学院 A kind of manual compression device based on worm and wormwheel Yu slot-and-crank drive
IT201800004043A1 (en) * 2018-03-28 2019-09-28 Bosch Gmbh Robert PUMPING GROUP TO FEED FUEL, PREFERABLY DIESEL, TO AN INTERNAL COMBUSTION ENGINE

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GB850518A (en) * 1956-05-29 1960-10-05 Philip Walker Carver Improvements in pumps for liquids
DE1650303A1 (en) * 1967-10-21 1970-09-10 Bosch Gmbh Robert Pressure control valve
US4596519A (en) * 1982-07-29 1986-06-24 Walbro Corporation Gear rotor fuel pump
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DE4011668A1 (en) * 1990-04-11 1991-10-17 Bosch Gmbh Robert SUCTION CONNECTOR FOR A HYDROPUMP
US5039284A (en) * 1990-05-08 1991-08-13 Walbro Corporation Fuel pump with a vapor vent valve
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US5263459A (en) * 1992-11-27 1993-11-23 Walbro Corporation Fuel delivery with self-priming fuel pump
DE4240593A1 (en) * 1992-12-03 1994-06-09 Bosch Gmbh Robert Unit supplying fuel via fuel pump to IC engine - has relief channel located close to end of suction opening and extends radially of delivery element

Also Published As

Publication number Publication date
DE19625567A1 (en) 1998-01-22
DE19625567C2 (en) 2001-02-15
CZ55098A3 (en) 1999-05-12
DE59704776D1 (en) 2001-11-08
US6186746B1 (en) 2001-02-13
WO1997049916A1 (en) 1997-12-31
CZ289388B6 (en) 2002-01-16
EP0846228A1 (en) 1998-06-10

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