EP0219635A1 - 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
EP0219635A1
EP0219635A1 EP86111244A EP86111244A EP0219635A1 EP 0219635 A1 EP0219635 A1 EP 0219635A1 EP 86111244 A EP86111244 A EP 86111244A EP 86111244 A EP86111244 A EP 86111244A EP 0219635 A1 EP0219635 A1 EP 0219635A1
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EP
European Patent Office
Prior art keywords
piston
pump
cylinder
pump according
actuating element
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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.)
Granted
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EP86111244A
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German (de)
French (fr)
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EP0219635B1 (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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    • 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 operated pumps are used to fill the system during commissioning or for refilling and venting 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 so that pressure surges (pressure peaks) of the feed pump do not damage or even destroy the piston or the seals, so that the pump would no longer be functional.
  • Such a pump is known from US Pat. No. 3,803,968, in which the locking takes place by means of a bayonet lock of the actuating element with the cylinder. Furthermore, a type of pump is known, the pistons of which have a threaded pin and the cylinders of which have a corresponding internal thread. The screw is locked by screwing the threaded pin into the internal thread.
  • the problem set out in the aforementioned prior art is solved with technically simple means and achieved that after the pump has been actuated, the piston does not have to be locked or similarly fixed to the cylinder.
  • the static sealing in the end position of the piston achieves on the one hand the smallest possible dead space and on the other hand prevents pressure peaks on the dynamic piston seal. Because the pump only requires pressure actuation, it can still be operated even in hard-to-reach places.
  • FIG. 1 An embodiment of the invention is shown in the drawing and explained in more detail in the description of the figures.
  • the single figure shows a hand-operated hand pump for feed pumps of fuel injection systems for internal combustion engines in axial section and natural size.
  • a hand-operated 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 an end 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 element, 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 element in the form of a ball valve 16/19.
  • 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 Feed pump 26 leading channel is screwed.
  • the piston 12 has an axial bore 28 and has a hollow cylindrical piston rod 27 on the end face, the cavity 29 of which forms an annular inner shoulder 30 with the bore 28.
  • a hollow cylindrical valve tappet 31 has at one end an outer collar 32 abutting the inner shoulder 30 and at the other end a plurality of radial slots 34 and a central pin 33 interacts in a descriptive manner.
  • the working space of the hand pump is formed by the cavity 29 of the piston rod 27, a cavity 35 of the valve plunger 31 and a cavity 36 which the cylinder 10, the screw connector 11 and the piston 12 limit.
  • 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 ball valve (16/19) is closed and the working space of the pump formed by the cavities 29 and 35 and 36 is filled with air or medium, ie fuel or a mixture of fuel with air.
  • a pressure according to arrow 52 on the actuating element 37 counteracts the force of the return spring 47 and causes the piston 12 to move inwards, whereby the pin 33 pushes open the ball valve 16/19 and thereby medium from the working space 29/35/36 is pressed 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 afterwards the pressure force 52 - in addition to the force of the return spring 47 - counteracts the force of the retaining spring 50.
  • air or medium, ie fuel or fuel-air mixture is pressed from the working space 29/35/36 into the pressure system 53 of the feed pump 26.
  • the return stroke of the piston 12 takes place automatically in the reverse order until the shown rest position of the pump with closed ball valve 16/19 is reached; air or medium, i. H. Fuel or fuel-air mixture drawn from the suction system 55 of the feed pump 26 into the working space 29/35/36.
  • 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 are also used by the hand pump in a manner known per se.

Abstract

Die Pumpe für Förderpumpen von Kraftstoff-Einspritzanlagen für Brennkraftmaschinen hat ein handbetätigbares Element (37), das gegen die Kraft einer Rückholfeder (47) den Einwärtshub des Kolbens (12) mit Ventilstößel (31) bewirkt und dabei ein Kugelventil (16/19) zum System (53, 55) der Förderpumpe (26) aufstößt. Hierbei wird Medium aus dem Arbeitsraum (29, 35, 36) in das Drucksystem (53) gedrückt. Beim selbsttätigen Rückhub des Kolbens (12) wird Medium aus dem Saugsystem (55) der Förderpumpe (26) in den Arbeitszylinder (29, 35, 36) angesaugt und am Ende des Rückhubes schließt das Kugelventil (16/19) selbsttätig. Die Pumpe erfordert in ihrer Ruhelage keine Arretierung des Kolbens (12) und von diesem werden Druckstöße der Förderpumpe (26) ferngehalten.The pump for feed pumps of fuel injection systems for internal combustion engines has a manually operable element (37) which, against the force of a return spring (47), effects the inward stroke of the piston (12) with valve tappet (31) and thereby a ball valve (16/19) System (53, 55) of the feed pump (26) pushes open. Medium is pressed out of the work space (29, 35, 36) into the printing system (53). During the automatic return stroke of the piston (12), medium is sucked out of the suction system (55) of the feed pump (26) into the working cylinder (29, 35, 36) and at the end of the return stroke the ball valve (16/19) closes automatically. In its rest position, the pump does not require any locking of the piston (12) and pressure surges of the feed pump (26) are kept away from it.

Description

Stand der TechnikState of the art

Die Erfindung betrifft eine handbetätigbare Pumpe für Förderpumpen von Kraftstoff-Einspritzanlagen für Brenn­kraftmaschinen nach der Gattung des Anspruchs 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, damit Druckstöße (Druckspitzen) der För­derpumpe den Kolben oder die Dichtungen nicht beschä­digen oder sogar zerstören, so daß die Pumpe nicht mehr funktionstüchtig wäre.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 operated pumps are used to fill the system during commissioning or for refilling and venting 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 so that pressure surges (pressure peaks) of the feed pump do not damage or even destroy the piston or the seals, so that the pump would no longer be functional.

Aus der US-PS 3 803 968 ist eine derartige Pumpe bekannt, bei der die Arretierung mittels eines Bajonettverschlusses des Betätigungselementes mit dem Zylinder erfolgt. Des­weiteren ist ein ausgeführterPumpen-Typ bekannt, dessen Kolben einen Gewindezapfen und dessen Zylinder ein korres­pondierendes Innengewinde aufweisen. Durch Einschrauben des Gewindezapfens in das Innengewinde erfolgt hierbei die Arretierung.Such a pump is known from US Pat. No. 3,803,968, in which the locking takes place by means of a bayonet lock of the actuating element with the cylinder. Furthermore, a type of pump is known, the pistons of which have a threaded pin and the cylinders of which have a corresponding internal thread. The screw is locked by screwing the threaded pin into the internal thread.

In der Praxis hat es sich jedoch herausgestellt, daß die Arretierung nicht immer erfolgte und dadurch die vorbeschriebenen Schäden an der Pumpe entstanden oder gar deren Ausfall verursachte.In practice, however, it has been found that the locking did not always take place and as a result the damage to the pump described above occurred or even caused its failure.

Vorteile der ErfindungAdvantages of the invention

Mit der Erfindung wird das im vorerwähnten Stand der Tech­nik dargelegte Problem mit technisch einfachen Mitteln gelöst und erreicht, daß nach der Betätigung der Pumpe eine Arretierung oder ähnliche Festlegung des Kolbens am Zylinder nicht erfolgen muß. Durch die statische Ab­dichtung in der Endlage des Kolbens erreicht man einer­seits einen geringstmöglichen Totraum und andererseits verhindert man Druckspitzen an der dynamischen Kolben­dichtung. Dadurch, daß die Pumpe nur eine Druckbetätigung erfordert, ist sie auch an schwer zugänglichen Stellen noch betätigbar.With the invention, the problem set out in the aforementioned prior art is solved with technically simple means and achieved that after the pump has been actuated, the piston does not have to be locked or similarly fixed to the cylinder. The static sealing in the end position of the piston achieves on the one hand the smallest possible dead space and on the other hand prevents pressure peaks on the dynamic piston seal. Because the pump only requires pressure actuation, it can still be operated even in hard-to-reach places.

Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen beschrieben. Mit Anspruch 3 werden Hub­differenzen zwischen Ventil und Kolben in vorteilhafter Wei­se ausgeglichen. Mit Anspruch 11 wird zum einen der Innen­bereich der Pumpe gegen Schmutz und Spritzwasser ge­schützt und zum andern ein definierter Anschlag für den Kolben in seiner äußeren Totlage geschaffen.Advantageous developments of the invention are described in the subclaims. With claim 3 stroke differences between the valve and piston are compensated in an advantageous manner. With claim 11, the inner region of the pump is protected against dirt and splash water and, on the other hand, a defined stop for the piston is created in its outer dead center.

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 single 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 Stirnzapfen 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 Absperrelements 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 Absperrelement in Form eines Kugelventils 16/19.A hand-operated 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 an end 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 element, 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 element in the form of a ball valve 16/19.

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 25 eines zum Arbeitsraum einer Förderpumpe 26 führenden Kanals 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 Feed pump 26 leading channel is screwed.

Der Kolben 12 hat eine Axialbohrung 28 und weist stirn­seitig eine hohlzylinderförmige Kolbenstange 27 auf, deren Hohlraum 29 mit der Bohrung 28 eine ringförmige Innenschulter 30 bilden. 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 der Stirnfläche 39 des Anschraub­stutzens 11 in noch zu beschreibender Weise zusammen­wirkt. Den Arbeitsraum der Handpumpe bilden der Hohl­raum 29 der Kolbenstange 27, ein Hohlraum 35 des Ventil­ stößels 31 und ein Hohlraum 36, den der Zylinder 10, der Anschraubstutzen 11 und der Kolben 12 begrenzen.The piston 12 has an axial bore 28 and has a hollow cylindrical piston rod 27 on the end face, the cavity 29 of which forms an annular inner shoulder 30 with the bore 28. A hollow cylindrical valve tappet 31 has at one end an outer collar 32 abutting the inner shoulder 30 and at the other end a plurality of radial slots 34 and a central pin 33 interacts in a descriptive manner. The working space of the hand pump is formed by the cavity 29 of the piston rod 27, a cavity 35 of the valve plunger 31 and a cavity 36 which the cylinder 10, the screw connector 11 and the piston 12 limit.

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 Ultraschallshweißen 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 Kugelventil (16/19) ge­schlossen und der durch die Hohlräume 29 und 35 sowie 36 gebildete Arbeitsraum der Pumpe mit Luft bzw. Me­dium, d. h. Kraftstoff oder ein Gemisch aus Kraftstoff mit 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 Kugelventil 16/19 aufstößt und hierdurch Medium aus dem Arbeitsraum 29 / 35 / 36 in das Drucksystem 53 der Förderpumpe 26 gedrückt wird. Der weitergehende Einwärtshub bewirkt durch Zusammen­wirken des Anschlages 38 mit der Stirnfläche 39 den Stillstand des Ventilstößels 31, so daß danach der Druckkraft 52 - zusätzlich zur Kraft der Rückholfeder 47 - die Kraft der Haltefeder 50 entgegenwirkt. Beim ge­samten Einwärtshub wird Luft bzw. Medium, d. h. Kraft­stoff oder Kraftstoff-Luft-Gemisch vom Arbeitsraum 29/ 35 / 36 in das Drucksystem 53 der Förderpumpe 26 gedrückt.In the rest position shown, the ball valve (16/19) is closed and the working space of the pump formed by the cavities 29 and 35 and 36 is filled with air or medium, ie fuel or a mixture of fuel with air. A pressure according to arrow 52 on the actuating element 37 counteracts the force of the return spring 47 and causes the piston 12 to move inwards, whereby the pin 33 pushes open the ball valve 16/19 and thereby medium from the working space 29/35/36 is pressed 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 afterwards the pressure force 52 - in addition to the force of the return spring 47 - counteracts the force of the retaining spring 50. During the entire inward stroke, air or medium, ie fuel or fuel-air mixture, is pressed from the working space 29/35/36 into the pressure system 53 of the feed pump 26.

Nach dem Einwärtshub und Aufhören der Druckkraft gemäß Pfeil 52 erfolgt selbsttätig der Rückhub des Kolbens 12 in umgekehrter Reihenfolge, bis die dargestellte Ruhe­lage der Pumpe mit geschlossenem Kugelventil 16/ 19 er­reicht ist; hierbei wird Luft bzw. Medium, d. h. Kraft­stoff oder Kraftstoff-Luft-Gemisch aus dem Saugsystem 55 der Förderpumpe 26 in den Arbeitsraum 29/ 35 /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 return stroke of the piston 12 takes place automatically in the reverse order until the shown rest position of the pump with closed ball valve 16/19 is reached; air or medium, i. H. Fuel or fuel-air mixture drawn from the suction system 55 of the feed pump 26 into the working space 29/35/36. 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 dargestellten Förder­pumpe 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, not shown, are also used by the hand pump in a manner known per se.

Claims (13)

1. Handbetätigbare Pumpe für Förderpumpen von Kraft­stoff-Einspritzanlagen für Brennkraftsmaschinen mit einem an einem Gehäuse der Förderpumpe festgelegten Zylinder und mit einem mittels einer Kolbenstange und eines Be­tätigungselementes verschiebbaren Kolben, der mit dem Zylinder einen Arbeitsraum bildet, wobei beim Arbeits­hub des Kolbens aus seiner Ruhelage Luft bzw. Medium (Kraftstoff oder Kraftstoff-Luft-Gemisch) vom Arbeitsraum in das System (Drucksystem) der Förderpumpe gedrückt wird und beim Rückwärtshub des Kolbens Luft bzw. Medium aus dem System (Saugsystem) der Förderpumpe in den Arbeitsraum gesaugt wird, dadurch gekennzeichnet, daß zwischen dem Betätigungselement (37) und dem Zylinder (10) eine Rückholfeder (47) für den Kolben (12) ange­ordnet ist und daß zwischen dem Arbeitsraum (29/ 35/­36) und dem System (53, 55) der Förderpumpe (26) ein Absperrelement (16 / 19) angeordnet ist, das mindestens mittelbar durch den Kolben (12) bei dessen Einwärtshub (Pfeil 52) aufgestoßen wird und am Ende von dessen Rück­wärtshub (Pfeil 54) selbsttätig schließt.1.Hand-operated pump for feed pumps of fuel injection systems for internal combustion engines with a cylinder fixed to a housing of the feed pump and with a piston which can be displaced by means of a piston rod and an actuating element and which forms a working space with the cylinder, with air from its idle position during the working stroke of the piston or medium (fuel or fuel-air mixture) is pressed into the system (pressure system) of the feed pump by the work space and air or medium is sucked out of the system (suction system) of the feed pump into the work space during the backward stroke of the piston, characterized in that that a return spring (47) for the piston (12) is arranged between the actuating element (37) and the cylinder (10) and that between the working space (29 / 35/36) and the system (53, 55) of the feed pump (26 ) a shut-off element (16/19) is arranged, which is pushed open at least indirectly by the piston (12) during its inward stroke (arrow 52) ird and closes automatically at the end of its backward stroke (arrow 54). 2. Pumpe nach Anspruch 1 mit einem stirnseitigen Boden­teil des Zylinders, dadurch gekennzeichnet, daß das Absperrelement (16/ 19) im Bodenteil (11) des Zylinders (10) angeordnet ist und als federbelastetes Ventil, insbesondere als federbelastetes Kugelventil, ausgebil­det ist.2. Pump according to claim 1 with a front bottom part of the cylinder, characterized in that the shut-off element (16/19) in the bottom part (11) of the cylinder (10) is arranged and is designed as a spring-loaded valve, in particular as a spring-loaded ball valve. 3. Pumpe nach Anspruch 1 oder 2, dadurch gekennzeich­net, daß ein Absperrteil (19) des Absperrelementes (16/­19) über eine federnde Verbindung mit dem Kolben (12) koppelbar ist.3. Pump according to claim 1 or 2, characterized in that a shut-off part (19) of the shut-off element (16/19) can be coupled via a resilient connection to the piston (12). 4. Pumpe nach einem der vorgenannten Anspruch 3, da­durch gekennzeichnet, daß an einer dem Arbeitsraum (29 / 35 / 36) abgewandten Schulter (30) des Kolbens (12) ein elastisch mit dem Kolben (12) verbundener, das Ab­sperrelement (16 / 19) betätigender Ventilstößel (31) anliegt, daß eine sich am Betätigungselement (37) ab­stützende Haltefeder (50), insbesondere eine vorge­spannte Schraubendruckfeder, den Ventilstößel (31) an die Schulter (30) des Kolbens (12) drückt und daß der Ventilstößel (31) hohlzylinderförmig ist und einen das Absperrteil (19) vom Ventilsitz (16) abhebenden Zapfen (33) und einen den Hub des Ventilstößels (31) begrenzenden Anschlag (38) aufweist.4. Pump according to one of the preceding claims 3, characterized in that on a shoulder (30/35/36) facing away from the working space (30) of the piston (12) an elastically connected to the piston (12), the shut-off element (16 / 19) of the actuating valve tappet (31), that a retaining spring (50), in particular a prestressed helical compression spring, supported on the actuating element (37) presses the valve tappet (31) against the shoulder (30) of the piston (12) and that the valve tappet ( 31) is hollow cylindrical and has a pin (33) lifting the shut-off part (19) from the valve seat (16) and a stop (38) limiting the stroke of the valve tappet (31). 5. Pumpe nach Anspruch 3 oder 4, dadurch gekennzeichnet, daß der Kolben (12) und die Kolbenstange (27) hohlzylin­derförmig sind, daß der Hohlraum (29) der Kolbenstange (27) die Haltefeder (50) aufnimmt und daß die Rückhol­feder (47) des Kolbens (12) als Schraubendruckfeder aus­gebildet ist und sich an einer Außenschulter (46) des Zylinders (10) abstützt.5. Pump according to claim 3 or 4, characterized in that the piston (12) and the piston rod (27) are hollow cylindrical, that the cavity (29) of the piston rod (27) receives the retaining spring (50) and that the return spring (47 ) of the piston (12) is designed as a helical compression spring and is supported on an outer shoulder (46) of the cylinder (10). 6. Pumpe nach Anspruch 5, dadurch gekennzeichnet, daß ein Außenring (45) des Zylinders (10) die Außenschul­ter (46) für die Rückholfeder (47) bildet und daß das Betätigungselement (37) eine Platte (40) aufweist, an deren Außenrand eine Hülse (41) angeformt ist.6. Pump according to claim 5, characterized in that an outer ring (45) of the cylinder (10) forms the outer shoulder (46) for the return spring (47) and that Actuating element (37) has a plate (40), on the outer edge of which a sleeve (41) is formed. 7. Pumpe nach einem der Ansprüche 2 bis 6, dadurch ge­kennzeichnet, daß die Befestigung des Zylinders (10) an dem das Absperrelement (16/19) aufnehmenden Bodenteil (11) durch Einstemmen erfolgt.7. Pump according to one of claims 2 to 6, characterized in that the fastening of the cylinder (10) to the shut-off element (16/19) receiving the bottom part (11) is carried out by caulking. 8. Pumpe nach Anspruch 7, dadurch gekennzeichnet, daß das Bodenteil (11) als ein Anschraubstutzen ausgebil­det ist mit einem in ein Innengewinde (25) der Förder­pumpe (26) eingeschraubten Gewindezapfen (23).8. Pump according to claim 7, characterized in that the base part (11) is designed as a screw-on connector with a threaded pin (23) screwed into an internal thread (25) of the feed pump (26). 9. Pumpe mit einer Kolbendichtung nach einem der An­sprüche 2 bis 8, dadurch gekennzeichnet, daß die Kol­bendichtung eine Doppellippendichtung (13) ist, die auf einem Stirnzapfen (14) des Kolbens (12) befestigt ist.9. Pump with a piston seal according to one of claims 2 to 8, characterized in that the piston seal is a double lip seal (13) which is attached to an end pin (14) of the piston (12). 10. Pumpe nach einem der vorgenannten Ansprüche, dadurch gekennzeichnet, daß die Kolbenstange (27) in einer Ring­rille (49) des Betätigungselementes (37) unlösbar be­festigt ist.10. Pump according to one of the preceding claims, characterized in that the piston rod (27) in an annular groove (49) of the actuating element (37) is permanently attached. 11. Pumpe nach einem der Ansprüche 6 bis 10, dadurch ge­kennzeichnet, daß an der Stirnfläche der Hülse (41) des Betätigungselementes (37) ein Anschlagring (44) befestigt ist, der in Ruhelage der Pumpe durch die Kraft der Rück­holfeder (47) am Außenring (45) des Zylinders (10) an­liegt.11. Pump according to one of claims 6 to 10, characterized in that a stop ring (44) is attached to the end face of the sleeve (41) of the actuating element (37), which in the rest position of the pump by the force of the return spring (47) on Outer ring (45) of the cylinder (10) abuts. 12. Pumpe nach Anspruch 11, dadurch gekennzeichnet, daß der Anschlagring (44) einen Wulst (43) aufweist, der in eine Innennut (42) der Stirnfläche der Hülse (41) des Betätigungselementes (37) eingreift.12. Pump according to claim 11, characterized in that the stop ring (44) has a bead (43) which engages in an inner groove (42) of the end face of the sleeve (41) of the actuating element (37). 13. Pumpe nach einem der Ansprüche 10 bis 12, dadurch gekennzeichnet, daß die Befestigung sowohl der Kolben­stange (27) in der Ringrille (49) des Betätigungsele­mentes (37) als auch des Anschlagringes (44) an der Hülse (41) des Betätigungselementes (37) durch Ultra­schallschweißen der aus Kunststoff bestehenden Bauteile erfolgt.13. Pump according to one of claims 10 to 12, characterized in that the attachment of both the piston rod (27) in the annular groove (49) of the actuating element (37) and the stop ring (44) on the sleeve (41) of the actuating element ( 37) by ultrasonic welding of the plastic components.
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
DE19853534485 DE3534485A1 (en) 1985-09-27 1985-09-27 MANUAL OPERATING PUMP FOR CONVEYOR PUMPS OF FUEL INJECTION SYSTEMS FOR INTERNAL COMBUSTION ENGINES
DE3534485 1985-09-27

Publications (2)

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

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ID=6282115

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Application Number Title Priority Date Filing Date
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)

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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
US6840508B2 (en) * 2003-03-13 2005-01-11 Tecumseh Products Company Push button air primer for carburetor
US6863266B2 (en) 2003-03-13 2005-03-08 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

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Publication number Priority date Publication date Assignee Title
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GB2231097B (en) * 1989-01-13 1992-12-02 Bosch Gmbh Robert Hand-operated pump for a feed pump of a fuel injection system for an internal combustion engine

Also Published As

Publication number Publication date
JPS6282267A (en) 1987-04-15
EP0219635B1 (en) 1990-04-11
US4747760A (en) 1988-05-31
DE3534485A1 (en) 1987-04-02
DE3670345D1 (en) 1990-05-17
JPH0792027B2 (en) 1995-10-09

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