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EP0219635B1 - Hand-operated pump for feed pumps of fuel injection systems for internal-combustion engines - Google Patents

Hand-operated pump for feed pumps of fuel injection systems for internal-combustion engines Download PDF

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Publication number
EP0219635B1
EP0219635B1 EP86111244A EP86111244A EP0219635B1 EP 0219635 B1 EP0219635 B1 EP 0219635B1 EP 86111244 A EP86111244 A EP 86111244A EP 86111244 A EP86111244 A EP 86111244A EP 0219635 B1 EP0219635 B1 EP 0219635B1
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EP
European Patent Office
Prior art keywords
valve
plunger
pump
hand
shut
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
EP86111244A
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German (de)
French (fr)
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EP0219635A1 (en
Inventor
Leonhard Eberl
Karl Mielich
Miklos Dipl.-Ing. Mozes
Walter Schmid
Klaus Stieninger
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
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Publication of EP0219635A1 publication Critical patent/EP0219635A1/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
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/14—Pumps characterised by muscle-power operation
    • 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
    • F02M37/16—Feeding by means of driven pumps characterised by provision of personally-, e.g. manually-, operated pumps

Definitions

  • the invention relates to a hand-operated pump for feed pumps of fuel injection systems for internal combustion engines according to the preamble of claim 1.
  • Such manually operable pumps are used to fill the system during commissioning or to refill and vent after an intervention, such as when changing a filter insert or a filter box.
  • the piston When the pump is at rest, the piston must therefore be locked in the cylinder and seal the working area in the cylinder so that pressure surges (pressure peaks) of the feed pump do not damage or even destroy the piston or the seals, which would render the pump inoperable.
  • a hand pump of the generic type is known from US Pat. No. 2,290,829, which is, however, firmly integrated into the housing of the feed pump of a fuel injection system.
  • the piston is locked here automatically without additional securing means by the return spring holding the piston in its rest position.
  • the working space has its largest volume and accordingly increases the dead volume of the openly connected working space of the feed pump, as a result of which the pressure surges of the feed pump can penetrate fully onto the seals of the piston of the hand pump and destroy them.
  • a manually operable hand pump for feed pumps of fuel injection systems for internal combustion engines has a cylinder 10 with a front end part designed as a screw connection 11 and a piston 12 with a thrust pin 14, on which a double lip seal 13 cooperating with the cylinder 10 is blown open.
  • the screw connection 11 has a bore 15 which widens to a conical valve seat 16 which merges into a second bore 17 with a pressed-in support sleeve 18.
  • a valve ball 19, as a shut-off part of a shut-off valve 19A is pressed against the valve seat 16 by a valve spring 20, which rests on the support sleeve 18, and the valve seat 16 and the valve ball 19 form the shut-off valve 19A in the form of a ball valve.
  • the cylinder 10 is sealed and fastened to the screw-on connector 11 by means of an O-ring 21 or by a plurality of caulking points 22 distributed around the circumference 26 leading channel 25 is screwed.
  • the piston 12 has an axial bore 28 and has a hollow cylindrical piston rod 27, the cavity 29 of which forms an annular inner shoulder 30 with the bore 28.
  • a hollow cylindrical valve tappet 31 has an outer collar 32 abutting the inner shoulder 30 at one end and a plurality of radial slots 34 and a central pin 33 at the other end.
  • One end face of the valve plunger 31 forms a stop 38 which cooperates with an end face 39 of the screw connection 11 in a manner to be described.
  • the working space 36 of the hand pump is formed by a cavity which is delimited by the cylinder 10, screw-on connector 11 and piston 12, as well as the cavity 29 of the piston rod 27 and a cavity 35 of the valve tappet 31.
  • An actuating element 37 made of plastic has a plate 40, on the outer edge of which a sleeve 41 with an end-side inner groove 42 continues, into which a bead 43 of a stop ring 44 engages; this is attached to the sleeve 41 by ultrasonic welding.
  • An outer ring 45 projects from the jacket of the cylinder 10, on one shoulder of which the stop ring 44 is supported and on the opposite shoulder 46 a return spring designed as a helical compression spring 47 for the piston 12 is supported; on the other hand, the helical compression spring 47 presses against an annular shoulder 48 of the actuating element 37.
  • the stop ring 44 and at least the piston rod 27 are made of fuel-resistant plastic.
  • a prestressed retaining spring 50 is designed as a helical compression spring, which is supported on a second annular shoulder 51 of the actuating element 37 and holds the outer collar 32 of the valve tappet 31 pressed against the inner shoulder 30 of the piston 12.
  • the hand pump works as follows:
  • the shut-off valve 19A In the rest position shown, the shut-off valve 19A is closed and the working space 36 of the pump connected to the cavities 29 and 35 is filled with a medium, i.e. filled with air, fuel or a mixture of fuel and air.
  • a pressure according to arrow 52 on the actuating element 37 effects the inward stroke of the piston 12 against the force of the return spring 47, the pin 33 pushing the shut-off valve 19A and thereby pushing medium out of the working space 36 into the pressure system 53 of the feed pump 26.
  • the further inward stroke brings about the stop of the valve tappet 31 by the interaction of the stop 38 with the end face 39, so that the pressure force (arrow 52) - in addition to the force of the return spring 47 - then counteracts the force of the retaining spring 50.
  • medium i.e. Air or fuel or fuel-air mixture is pressed from the working space 36 into the pressure system 53 of the feed pump 26.
  • the backward stroke (arrow 54) of the piston 12 takes place automatically in the reverse order until the illustrated rest position of the pump is reached with the shut-off valve 19A closed.
  • Air or medium i.e. Fuel or fuel-air mixture drawn from the suction system 55 of the feed pump 26 into the working space 36.
  • the injection system is filled and vented at the same time by alternately sucking medium from the suction system and pressing it into the pressure system.
  • the hand pump can also be used for the same purpose in pipelines and the like, the hand pump then being attached to a separate housing which contains a suction valve and a pressure valve which are necessary for the function.
  • suction and pressure valves of the feed pump 26 are also used by the hand pump in a manner known per se.

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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 Of Reciprocating Pumps (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Reciprocating Pumps (AREA)

Description

Die Erfindung bezieht sich auf eine handbetätigbare Pumpe für Förderpumpen von Kraftstoff-Einspritzanlagen für Brennkraftmaschinen nach der Gattung des Anspruchs 1.The invention relates to a hand-operated pump for feed pumps of fuel injection systems for internal combustion engines according to the preamble of claim 1.

Derartige manuell betätigbare Pumpen dienen zum Füllen der Anlage bei Inbetriebnahme oder zum Wiederauffüllen und Entlüften nach einem Eingriff, wie beispielsweise beim Wechsel eines Filtereinsatzes oder einer Filterbox. In Ruhelage der Pumpe muß der Kolben im Zylinder deshalb arretiert sein und den Arbeitsraum im Zylinder abdichten, damit Druckstöße (Druckspitzen) der Förderpumpe den Kolben oder die Dichtungen nicht beschädigen oder sogar zerstören, wodurch die Pumpe nicht mehr funktionstüchtig wäre.Such manually operable pumps are used to fill the system during commissioning or to refill and vent after an intervention, such as when changing a filter insert or a filter box. When the pump is at rest, the piston must therefore be locked in the cylinder and seal the working area in the cylinder so that pressure surges (pressure peaks) of the feed pump do not damage or even destroy the piston or the seals, which would render the pump inoperable.

Aus der US-A 2 290 829 ist eine Handpumpe gattungsgemäßer Bauart bekannt, die allerdings fest in das Gehäuse der Förderpumpe einer Kraftstoffeinspritzanlage integriert ist. Die Arretierung des Kolbens erfolgt hier selbsttätig ohne weitere Sicherungsmittel durch die den Kolben in seiner Ruhelage haltende Rückholfeder. In dieser Lage des Kolbens hat der Arbeitsraum sein größtes Volumen und vergrößert entsprechend das Totvolumen des offen angeschlossenen Arbeitsraumes der Förderpumpe, wodurch außerdem die Druckstöße der Förderpumpe voll auf die Dichtungen des Kolbens der Handpumpe durchschlagen und diese zerstören können.A hand pump of the generic type is known from US Pat. No. 2,290,829, which is, however, firmly integrated into the housing of the feed pump of a fuel injection system. The piston is locked here automatically without additional securing means by the return spring holding the piston in its rest position. In this position of the piston, the working space has its largest volume and accordingly increases the dead volume of the openly connected working space of the feed pump, as a result of which the pressure surges of the feed pump can penetrate fully onto the seals of the piston of the hand pump and destroy them.

Aus der US-A 3 803 988 ist eine andersartige Handpumpe bekannt, die in eine Kraftstoffleitung eingefügt ist und bei der die Arretierung des Kolbens in seiner Innenlage mittels eines Bajonettverschlusses des Betätigungselementes mit dem Zylinder erfolgen muß. In dieser Innenlage wird mittels eines Dichtzapfens nur ein Einlaßkanal aus der Kraftstoffleitung abgedichtet. Desweiteren ist eine seit Jahrzehnten in dieser Bauart ausgelieferte Handpumpe bekannt (Druckschrift der Robert Bosch GmbH, Stuttgart, "Bosch Technische Unterrichtung - Diesel-Einspritzausrüstung (1), VDT-UBP 001/15, Seite 26, Bild 35, 2. Ausgabe vom 30. April 1973), deren Kolben einen Gewindezapfen und deren Zylinder ein korrespondierendes Innengewinde aufweisen. Durch Einschrauben des Gewindezapfens in das Innengewinde erfolgt hierbei die Arretierung des Kolbens in seiner Innenlage und eine Abdichtung der Arbeitsräume von Hand- und Förderpumpe. In der Praxis hat es sich jedoch herausgestellt, daß diese von der Bedienungsperson vorzunehmenden Arretierungen nicht immer erfolgten und dadurch die eingangs beschriebenen Schäden an der Pumpe entstanden oder gar deren Ausfall verursachten.From US-A 3 803 988 a different hand pump is known, which is inserted into a fuel line and in which the piston must be locked in its inner position by means of a bayonet lock of the actuating element with the cylinder. In this inner position, only one inlet channel from the fuel line is sealed by means of a sealing pin. Furthermore, a hand pump that has been delivered in this design for decades is known (publication by Robert Bosch GmbH, Stuttgart, "Bosch Technical Instruction - Diesel Injection Equipment (1), VDT-UBP 001/15, page 26, picture 35, 2nd edition of 30 April 1973), whose pistons have a threaded pin and whose cylinders have a corresponding internal thread. By screwing the threaded pin into the internal thread, the piston is locked in its inner position and the working spaces of the hand and feed pumps are sealed However, it was found that these locks to be carried out by the operator did not always take place and thus caused the damage to the pump described at the outset or even caused its failure.

Vorteile der ErfindungAdvantages of the invention

Mit der Erfindung werden die im vorerwähnten Stand der Technik dargelegten Probleme mit technisch einfachen Mitteln gelöst, und es wird erreicht, daß nach der Betätigung der Pumpe eine besondere Arretierung oder ähnliche Festlegung des Kolbens am Zylinder nicht erfolgen muß. Durch die automatische Abdichtung mittels des Absperrventils in der Außenlage des Kolbens erreicht man einerseits einen geringstmöglichen Totraum in dem Saug- und Drucksystem der Förderpumpe und andererseits verhindert man Druckspitzen an der hin-und herbewegten Kolbendichtung. Der Vorteil der gattungsgemäßen Handpumpe, gemäß dem die Pumpe nur eine Druckbetätigung erfordert und somit auch an schwer zugänglichen Stellen noch betätigbar ist, beibehalten worden.With the invention, the problems set out in the aforementioned prior art are solved with technically simple means, and it is achieved that after the actuation of the pump, a special locking or similar fixing of the piston on the cylinder need not take place. The automatic sealing by means of the shut-off valve in the outer position of the piston achieves on the one hand the smallest possible dead space in the suction and pressure system of the feed pump and on the other hand prevents pressure peaks on the reciprocating piston seal. The advantage of the generic hand pump, according to which the pump only requires pressure actuation and is therefore still operable even in places that are difficult to access, has been retained.

Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung sind in den Unteransprüchen beschrieben. So werden mit den Merkmalen gemäß Anspruch 3 oder 4 Hubdifferenzen zwischen Ventil und Kolben in vorteilhafter Weise ausgeglichen. Mit den Merkmalen gemäß Anspruch 6 wird zum einen der Innenbereich der Pumpe gegen Schmutz und Spritzwasser geschützt und zum anderen ein definierter Anschlag für den Kolben in seiner äußeren Totlage (Außenlage) geschaffen.Advantageous refinements and developments of the invention are described in the subclaims. Thus, stroke differences between valve and piston are advantageously compensated for with the features according to claim 3 or 4. With the features according to claim 6, the inner region of the pump is protected against dirt and splash water on the one hand and on the other hand a defined stop for the piston is created in its outer dead position (outer position).

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der Figurenbeschreibung näher erläutert. Die einzige Figur zeigt eine von Hand betätigbare Handpumpe für Förderpumpen von Kraftstoff-Einspritzanlagen für Brennkraftmaschinen in Axialschnitt und natürlicher Größe.An embodiment of the invention is shown in the drawing and explained in more detail in the description of the figures. The only figure shows a hand-operated hand pump for feed pumps of fuel injection systems for internal combustion engines in axial section and natural size.

Beschreibung des AusführungsbeispielesDescription of the embodiment

Eine von Hand betätigbare Handpumpe für Förderpumpen von Kraftstoff-Einspritzanlagen für Brennkraftmaschinen hat einen Zylinder 10 mit einem stirnseitigen, als Anschraubstutzen 11 ausgebildeten Bodenteil und einen Kolben 12 mit einem Stimzapfen 14, auf dem eine mit dem Zylinder 10 zusammenwirkende Doppellippendichtung 13 aufgesprengt ist. Der Anschraubstutzen 11 hat eine Bohrung 15, die sich zu einem konischen Ventilsitz 16 erweitert, der in eine zweite Bohrung 17 mit eingepreßter Stützhülse 18 übergeht. Eine Ventilkugel 19 wird als Absperrteil eines Absperrventils 19A durch eine Ventilfeder 20, die an der Stützhülse 18 anliegt, an den Ventilsitz 16 gedrückt, und der Ventilsitz 16 und die Ventilkugel 19 bilden das Absperrventil 19A in Form eines Kugelventils.A manually operable hand pump for feed pumps of fuel injection systems for internal combustion engines has a cylinder 10 with a front end part designed as a screw connection 11 and a piston 12 with a thrust pin 14, on which a double lip seal 13 cooperating with the cylinder 10 is blown open. The screw connection 11 has a bore 15 which widens to a conical valve seat 16 which merges into a second bore 17 with a pressed-in support sleeve 18. A valve ball 19, as a shut-off part of a shut-off valve 19A, is pressed against the valve seat 16 by a valve spring 20, which rests on the support sleeve 18, and the valve seat 16 and the valve ball 19 form the shut-off valve 19A in the form of a ball valve.

Die Abdichtung und Befestigung des Zylinders 10 am Anschraubstutzen 11 erfolgt über einen O-Ring 21 bzw. durch mehrere am Umfang verteilte Stemmstellen 22. Der Anschraubstutzen 11 weist einen Gewindezapfen 23 auf, der unter Zwischenlage eines Dichtringes 24 in ein Innengewinde eines zum Arbeitsraum einer Förderpumpe 26 führenden Kanals 25 eingeschraubt ist.The cylinder 10 is sealed and fastened to the screw-on connector 11 by means of an O-ring 21 or by a plurality of caulking points 22 distributed around the circumference 26 leading channel 25 is screwed.

Der Kolben 12 hat eine Axialbohrung 28 und weist eine hohlzylinderförmige Kolbenstange 27 auf, deren Hohlraum 29 mit der Bohrung 28 eine ringförmige Innenschulter 30 bildet. Ein hohlzylinderförmiger Ventilstößel 31 hat am einen Ende einen an der Innenschulter 30 anliegenden Außenbund 32 und am anderen Ende mehrere Radialschlitze 34 und einen mittigen Zapfen 33. Die eine Stirnfläche des Ventilstößels 31 bildet einen Anschlag 38, der mit einer Stirnfläche 39 des Anschraubstutzens 11 in noch zu beschreibender Weise zusammenwirkt. Den Arbeitsraum 36 der Handpumpe bilden ein Hohlraum, der vom Zylinder 10, Anschraubstutzen 11 und Kolben 12 begrenzt ist, sowie der Hohlraum 29 der Kolbenstange 27 und ein Hohlraum 35 des Ventilstößels 31.The piston 12 has an axial bore 28 and has a hollow cylindrical piston rod 27, the cavity 29 of which forms an annular inner shoulder 30 with the bore 28. A hollow cylindrical valve tappet 31 has an outer collar 32 abutting the inner shoulder 30 at one end and a plurality of radial slots 34 and a central pin 33 at the other end. One end face of the valve plunger 31 forms a stop 38 which cooperates with an end face 39 of the screw connection 11 in a manner to be described. The working space 36 of the hand pump is formed by a cavity which is delimited by the cylinder 10, screw-on connector 11 and piston 12, as well as the cavity 29 of the piston rod 27 and a cavity 35 of the valve tappet 31.

Ein aus Kunststoff gefertigtes Betätigungselement 37 hat eine Platte 40, an deren Außenrand sich eine Hülse 41 mit einer stirnseitigen Innennut 42 fortsetzt, in die ein Wulst 43 eines Anschlagringes 44 eingreift; dieser ist durch Ultraschallschweißen an der Hülse 41 befestigt. Vom Mantel des Zylinders 10 steht ein Außenring 45 ab, an dessen einer Schulter sich der Anschlagring 44 abstützt und an dessen gegenüberliegender Schulter 46 sich eine als Schraubendruckfeder 47 ausgebildete Rückholfeder für den Kolben 12 abstützt; andererseits drückt die Schraubendruckfeder 47 an eine Ringschulter 48 des Betätigungselementes 37. Der Anschlagring 44 und mindestens die Kolbenstange 27 bestehen aus kraftstoffresistentem Kunststoff.An actuating element 37 made of plastic has a plate 40, on the outer edge of which a sleeve 41 with an end-side inner groove 42 continues, into which a bead 43 of a stop ring 44 engages; this is attached to the sleeve 41 by ultrasonic welding. An outer ring 45 projects from the jacket of the cylinder 10, on one shoulder of which the stop ring 44 is supported and on the opposite shoulder 46 a return spring designed as a helical compression spring 47 for the piston 12 is supported; on the other hand, the helical compression spring 47 presses against an annular shoulder 48 of the actuating element 37. The stop ring 44 and at least the piston rod 27 are made of fuel-resistant plastic.

Die Kolbenstange 27 ist in einer Ringrille 49 des Betätigungselementes 37 durch Ultraschallschweißen befestigt. Eine vorgespannte Haltefeder 50 ist als Schraubendruckfeder ausgebildet, die sich an einer zweiten Ringschulter 51 des Betätigungselementes 37 abstützt und den Außenbund 32 des Ventilstößels 31 an die Innenschulter 30 des Kolbens 12 gedrückt hält.The piston rod 27 is fastened in an annular groove 49 of the actuating element 37 by ultrasonic welding. A prestressed retaining spring 50 is designed as a helical compression spring, which is supported on a second annular shoulder 51 of the actuating element 37 and holds the outer collar 32 of the valve tappet 31 pressed against the inner shoulder 30 of the piston 12.

Die Handpumpe funktioniert folgendermaßen:The hand pump works as follows:

In der dargestellten Ruhelage ist das Absperrventil 19A geschlossen und der mit den Hohlräumen 29 und 35 verbundene Arbeitsraum 36 der Pumpe mit einem Medium, d.h. mit Luft, Kraftstoff oder einem Gemisch aus Kraftstoff und Luft gefüllt. Ein Druck gemäß Pfeil 52 auf das Betätigungselement 37 bewirkt entgegen der Kraft der Rückholfeder 47 den Einwärtshub des Kolbens 12, wobei der Zapfen 33 das Absperrventil 19A aufstößt und hierdurch Medium aus dem Arbeitsraum 36 in das Drucksystem 53 der Förderpumpe 26 gedrückt wird. Der weitergehende Einwärtshub bewirkt durch Zusammenwirken des Anschlages 38 mit der Stimfläche 39 den Stillstand des Ventilstößels 31, so daß danach der Druckkraft (Pfeil 52) - zusätzlich zur Kraft der Rückholfeder 47 - die Kraft der Haltefeder 50 entgegenwirkt. Beim gesamten Einwärtshub wird Medium, d.h. Luft bzw. Kraftstoff oder Kraftstoff-Luft-Gemisch vom Arbeitsraum 36 in das Drucksystem 53 der Förderpumpe 26 gedrückt.In the rest position shown, the shut-off valve 19A is closed and the working space 36 of the pump connected to the cavities 29 and 35 is filled with a medium, i.e. filled with air, fuel or a mixture of fuel and air. A pressure according to arrow 52 on the actuating element 37 effects the inward stroke of the piston 12 against the force of the return spring 47, the pin 33 pushing the shut-off valve 19A and thereby pushing medium out of the working space 36 into the pressure system 53 of the feed pump 26. The further inward stroke brings about the stop of the valve tappet 31 by the interaction of the stop 38 with the end face 39, so that the pressure force (arrow 52) - in addition to the force of the return spring 47 - then counteracts the force of the retaining spring 50. During the entire inward stroke, medium, i.e. Air or fuel or fuel-air mixture is pressed from the working space 36 into the pressure system 53 of the feed pump 26.

Nach dem Einwärtshub und Aufhören der Druckkraft gemäß Pfeil 52 erfolgt selbsttätig der Rückwärtshub (Pfeil 54) des Kolbens 12 in umgekehrter Reihenfolge, bis die dargestellte Ruhelage der Pumpe mit geschlossenem Absperrventil 19A erreicht ist. Hierbei wird Luft bzw. Medium, d.h. Kraftstoff oder Kraftstoff-Luft-Gemisch aus dem Saugsystem 55 der Förderpumpe 26 in den Arbeitsraum 36 gesaugt. Durch das wechselseitige Saugen von Medium aus dem Saugsystem und Drücken in das Drucksystem wird die Einspritzanlage gefüllt und gleichzeitig entlüftet.After the inward stroke and the cessation of the pressure force according to arrow 52, the backward stroke (arrow 54) of the piston 12 takes place automatically in the reverse order until the illustrated rest position of the pump is reached with the shut-off valve 19A closed. Air or medium, i.e. Fuel or fuel-air mixture drawn from the suction system 55 of the feed pump 26 into the working space 36. The injection system is filled and vented at the same time by alternately sucking medium from the suction system and pressing it into the pressure system.

Die Handpumpe ist auch zum gleichen Zweck in Rohrleitungen und dergleichen verwendbar, wobei die Handpumpe dann an ein separates Gehäuse angebaut wird, das ein - für die Funktion nötiges - Saugventil und ein Druckventil enthält. Im Regelfall, so beim dargestellten Anbau an die Förderpumpe, werden in an sich bekannter Weise Saug- und Druckventil der nicht näher dargestellten Förderpumpe 26 von der Handpumpe mitbenutzt.The hand pump can also be used for the same purpose in pipelines and the like, the hand pump then being attached to a separate housing which contains a suction valve and a pressure valve which are necessary for the function. As a rule, in the case of the attachment to the feed pump shown, suction and pressure valves of the feed pump 26, not shown in more detail, are also used by the hand pump in a manner known per se.

Claims (6)

1. Hand-operated pump for feed pumps of fuel injection systems for internal-combustion engines, comprising a cylinder (10) secured to a separate housing, containing a working chamber with suction and pressure valve, of a hand feed pump or to a housing of the feed pump (26), a plunger (12) which is displaceable by means of a plunger rod (27) and an actuating element (37) and, with the cylinder (10), forms a working chamber (36), and a restoring spring (47) for the plunger (12), which restoring spring (47) is arranged between the actuating element (37) and the cylinder (10), the medium to be delivered being forced, during the inward stroke of the plunger (12), from the working chamber (36) of the hand pump through a connecting line into the pressure system (53) of the feed pump (26) and, during the return stroke of the plunger (12), the medium being drawn out of the suction system (55) of the feed pump (26) through the connecting line into the working chamber (36), characterized in that a shut-off valve (19A) arranged in a base part (11) of the cylinder (10) and acting as a non-return valve is provided in the connecting line between the working chamber (36) of the hand pump and the suction and pressure system (53, 55) of the feed pump (26), the shutoff part (19) of which shut-off valve (19A), is pushed open at the start of the inward stroke (arrow 52) of the plunger (12), by a stem (33), projecting at the end face, of the plunger (12) and is kept open during approximately the entire inward and return stroke and which closes automatically only at the end of the return stroke (arrow 54).
2. Pump according to Claim 1, characterized in that the shut-off valve (19A) is designed as a spring-loaded valve, in particular as a spring-loaded ball valve.
3. Pump according to Claim 1 or 2, characterized in that the shut-off part (19) of the shut-off valve (19A) can be actuated in the opening direction via a valve lifter (31) guided in a cushioned flexible manner in the plunger (12) and having the stem (33).
4. Pump according to Claim 3, characterized in that the valve lifter (31) bears against a shoulder (30), remote from the working chamber (36), inside the plunger (12), in that a preloaded retaining spring (50) supported against the actuating element (37) presses the valve lifter (31) against the shoulder (30) of the plunger (12), and in that the valve lifter (31) is of hollow cylindrical shape and, at its end projecting into the working chamber (36), has the stem (33) which lifts the shut-off part (19) from the valve seat (16) and a stop (38) which limits the stroke of the valve lifter (31).
5. Pump according to Claim 3 or 4, characterized in that the plunger (12) and the plunger rod (27) are of hollow cylindrical shape, and the hollow space (29) of the plunger rod (27) accommodates the retaining spring (50).
6. Pump according to any of Claims 1 to 5, characterized in that a collar-like outer ring (45) of the cylinder (10) forms an outer shoulder (46) for supporting the restoring spring (47), in that the actuating element (37) has a plate (40) with a sleeve (41) which is shaped to the outer margin of the plate (40) and fixed to its end face is a stop ring (44) which, in the unoperated position of the plunger (12), bears against the outer ring (45) of the cylinder (10) owing to the force of the restoring spring (47).
EP86111244A 1985-09-27 1986-08-14 Hand-operated pump for feed pumps of fuel injection systems for internal-combustion engines Expired - Lifetime EP0219635B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3534485 1985-09-27
DE19853534485 DE3534485A1 (en) 1985-09-27 1985-09-27 MANUAL OPERATING PUMP FOR CONVEYOR PUMPS OF FUEL INJECTION SYSTEMS FOR INTERNAL COMBUSTION ENGINES

Publications (2)

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EP0219635A1 EP0219635A1 (en) 1987-04-29
EP0219635B1 true EP0219635B1 (en) 1990-04-11

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EP86111244A Expired - Lifetime EP0219635B1 (en) 1985-09-27 1986-08-14 Hand-operated pump for feed pumps of fuel injection systems for internal-combustion engines

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US (1) US4747760A (en)
EP (1) EP0219635B1 (en)
JP (1) JPH0792027B2 (en)
DE (2) DE3534485A1 (en)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3900875A1 (en) * 1989-01-13 1990-07-19 Bosch Gmbh Robert MANUAL OPERATING PUMP FOR CONVEYOR PUMPS OF FUEL INJECTION SYSTEMS FOR INTERNAL COMBUSTION ENGINES
DE4313853C2 (en) * 1993-04-28 1997-08-07 Bosch Gmbh Robert Manually operated pump for feed pumps of fuel injection systems for internal combustion engines
US5984425A (en) * 1998-01-22 1999-11-16 Wacker Corporation Spring applied/hydraulically released braking system employing self-resetting override valve
DE10041486A1 (en) * 2000-08-24 2002-03-21 Portex Handelsgmbh Hand operated pump for fuel injection system of internal combustion engine, has return spring arranged within working area of pump cylinder
US20030137104A1 (en) * 2002-01-22 2003-07-24 Gaylor Edward Appleton Hardway
US6863266B2 (en) 2003-03-13 2005-03-08 Tecumseh Products Company Push button air primer for carburetor
US6840508B2 (en) * 2003-03-13 2005-01-11 Tecumseh Products Company Push button air primer for carburetor
US6848680B2 (en) * 2003-03-27 2005-02-01 Tecumseh Products Company Push button air primer for carburetor
EP2273123B9 (en) 2009-07-08 2018-03-21 Pierburg Pump Technology GmbH Axial bearing for a pump wheel
DE102010016480A1 (en) * 2010-04-16 2011-10-20 Hengst Gmbh & Co. Kg Hand pump of a fuel system
DE102011083787A1 (en) * 2011-09-29 2013-04-04 Hengst Gmbh & Co. Kg Fuel pump assembly
CN108979921A (en) * 2018-06-25 2018-12-11 潍柴动力股份有限公司 Handlance and method for exhausting for fuel filter
CZ309417B6 (en) * 2018-12-05 2022-12-21 TF PRESS s.r.o Hand pump

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2290829A (en) * 1939-09-29 1942-07-21 Timken Roller Bearing Co Fuel pump
US2966861A (en) * 1956-10-08 1961-01-03 Drackett Co Measuring pump
US3288072A (en) * 1965-01-13 1966-11-29 Walker Mfg Co Pump
US3468257A (en) * 1966-04-02 1969-09-23 Eberspaecher J Liquid pump valve actuating arrangement
US3500759A (en) * 1968-06-13 1970-03-17 Caterpillar Tractor Co Fuel priming pump
US3669576A (en) * 1970-06-15 1972-06-13 Caterpillar Tractor Co Fuel priming pump
US3803968A (en) * 1972-08-29 1974-04-16 C Black Laminate cutter
US3803988A (en) * 1973-04-30 1974-04-16 Ovico Diesel fuel primer pump
CA1008825A (en) * 1974-03-28 1977-04-19 William E. Warren Pump assembly for an atomizing piston pump
US4012174A (en) * 1975-10-20 1977-03-15 Caterpillar Tractor Co. Fuel priming pump
GB2114237B (en) * 1982-01-23 1985-06-05 Lucas Ind Plc Fuel treatment device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Druckschrift der Robert Bosch GmbH, Stuttgart "Bosch Technische Unterrichtung-Diesel-Einspritzausrüstung (1)",VDT-UBP 001/15, S. 26, 2. Ausgabe, 30.04.73 *

Also Published As

Publication number Publication date
JPS6282267A (en) 1987-04-15
DE3670345D1 (en) 1990-05-17
JPH0792027B2 (en) 1995-10-09
US4747760A (en) 1988-05-31
EP0219635A1 (en) 1987-04-29
DE3534485A1 (en) 1987-04-02

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