EP0480173A1 - Fuel injection pump for internal combustion engine - Google Patents

Fuel injection pump for internal combustion engine Download PDF

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Publication number
EP0480173A1
EP0480173A1 EP91114895A EP91114895A EP0480173A1 EP 0480173 A1 EP0480173 A1 EP 0480173A1 EP 91114895 A EP91114895 A EP 91114895A EP 91114895 A EP91114895 A EP 91114895A EP 0480173 A1 EP0480173 A1 EP 0480173A1
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EP
European Patent Office
Prior art keywords
fuel injection
pump
injection pump
piston
roller ring
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.)
Granted
Application number
EP91114895A
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German (de)
French (fr)
Other versions
EP0480173B1 (en
Inventor
Wolfgang Ing. Fehlmann
Wolfgang Dipl.-Ing. Braun (Fh)
Dieter Dipl.-Ing. Junger (Fh)
Werne Ing. Naumann
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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 EP0480173A1 publication Critical patent/EP0480173A1/en
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Classifications

    • 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
    • F02M41/00—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor
    • F02M41/08—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined
    • F02M41/10—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined pump pistons acting as the distributor
    • F02M41/12—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined pump pistons acting as the distributor the pistons rotating to act as the distributor
    • F02M41/121—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined pump pistons acting as the distributor the pistons rotating to act as the distributor with piston arranged axially to driving shaft
    • 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
    • F02M41/00—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor
    • F02M41/08—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined
    • F02M41/10—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined pump pistons acting as the distributor
    • F02M41/12—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined pump pistons acting as the distributor the pistons rotating to act as the distributor
    • F02M41/123—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined pump pistons acting as the distributor the pistons rotating to act as the distributor characterised by means for varying fuel delivery or injection timing
    • F02M41/125—Variably-timed valves controlling fuel passages

Definitions

  • the invention relates to a fuel injection pump for internal combustion engines according to the preamble of claim 1.
  • Such a fuel injection pump is known from DE-OS 38 05 033.
  • This fuel injection pump has a pump piston which is set into a rotary-stroke movement by a cam drive.
  • the cam drive consists of an essentially stationary part, which is designed as a roller ring, and a rotating part driven by a drive shaft, which is designed as a lifting disk.
  • the essentially stationary part can be rotated relative to the rotating part by means of a spray adjustment device, as a result of which the assignment of the stroke movement of the pump piston to the angle of rotation of the drive shaft can be changed.
  • the pump piston delimits a pump work space, which can be relieved via an electrically controlled valve during the pump stroke of the pump piston in order to control the injection-effective pump piston stroke.
  • a bolt engages radially in the essentially stationary part of the cam drive, which is, on the other hand, mounted in a piston via a slide piece.
  • the piston is arranged in a fuel-filled cylinder and, when subjected to the fuel pressure, is displaceable tangentially to the stationary part, which is rotated in the process.
  • the aim is to To effect spray adjustment depending on different operating parameters also by the electrically controlled valve, so that the adjustment of the fixed part is no longer necessary for this.
  • the fuel injection pump according to the invention with the characterizing features of claim 1 has the advantage that the substantially stationary part of the cam drive is fixed using components of known fuel injection pumps with injection adjustment device, so that only a few changes are required based on known fuel injection pumps.
  • FIG. 1 shows a fuel injection pump in longitudinal section with a first exemplary embodiment
  • FIG. 2 shows a detail of the fuel injection pump designated II in FIG. 1 with a second exemplary embodiment.
  • a fuel injection pump of the distributor type shown in FIG. 1 has a pump piston 13 operating in a cylinder bore 10 in a bushing 12 inserted into a pump housing 11.
  • the pump piston 13 is set in a reciprocating and at the same time rotating movement by a cam drive 14.
  • the cam drive 14 consists of a lifting disk 17, which is coupled to a drive shaft 16 of the fuel injection pump, as a rotating part and a roller ring 18 as a stationary part.
  • the lifting disk 17 has a cam track with end cam elevations 19, which rests on rollers 20 held in the roller ring 18.
  • the pump piston 13 on the one hand and an electrically controlled valve 22 inserted into the pump housing 11 on the other hand delimit a pump working chamber 23 in the cylinder bore 10.
  • the interior 24 of the fuel injection pump is filled with fuel by a feed pump 25 integrated in the fuel injection pump and serves as a suction chamber from which the Pump work space is supplied.
  • the roller ring 18 has a cylindrical outer circumference 26, via which it is mounted radially in a bore 27 in the pump housing 11.
  • a pin 30 engages radially in the roller ring 18 and is secured in the roller ring by a pin 31.
  • the end of the bolt 30 protruding from the roller ring 18 is mounted in a radial bore 32 in a sliding block 33 serving as a sliding piece.
  • the sliding block 33 is arranged in an axially displaceable manner in a longitudinal groove 36, which extends approximately parallel to the longitudinal axis 34 of the drive shaft 16 or fuel injection pump and is open to the interior 24, in the inside of the pump housing 11.
  • the sliding block 33 is guided between the bottom 37 of the longitudinal groove 36 and the outer circumference 26 of the roller ring 18 with little play.
  • the sliding block 33 is arranged in the longitudinal groove 36 with as little play as possible in order to block a rotary movement of the roller ring and around prevent the sliding block from knocking out in the longitudinal groove under impacts acting on the roller ring and supported by the sliding block.
  • the bolt 30 is pivotably arranged with little play and can be displaced along its longitudinal axis 38.
  • roller ring 18 and the bolt 30 can be adopted unchanged from known fuel injection pumps with an adjustable roller ring. An additional sealing point is not necessary when the roller ring is blocked.
  • a connection of the interior space 24 to the pump work space 23 is controlled by the valve 22.
  • the valve 22 is opened and fuel flows from the interior 24 through a channel 40 and the valve 22 into the pump working space 23.
  • the valve 22 is closed and over for the duration of the selected high-pressure delivery of the pump piston a distributor opening 41 on the circumference of the pump piston 13, the fuel brought to high pressure is conveyed with corresponding rotation of the pump piston into delivery channels 42 shown in broken lines, which are connected via injection lines to the injection points of the internal combustion engine.
  • the closing time and thus the high-pressure injection quantity and the closing time of the valve 22 which determines the start of the high-pressure injection phase is determined by a control unit (not shown).
  • a rotary encoder 43 which is connected to the control unit, is provided for detecting the speed and the rotational position of the drive shaft 16 of the fuel injection pump.
  • the control unit can take into account further operating parameters such as, for example, load, temperature, etc., of the internal combustion engine operated with the fuel injection pump.
  • the roller ring 18 and the bolt 30 are designed as described in the first exemplary embodiment.
  • the sliding block 46 is arranged in a blind bore 47 in the pump housing 11 which extends approximately parallel to the longitudinal axis 34 of the pump.
  • the bolt 30 protrudes through an opening 48 in the pump housing 11 between the interior 24 and the blind bore 47 into the bore 49 in the sliding block 46.
  • the sliding block 46 is axially displaceable in the blind bore 47, but is arranged transversely to its longitudinal axis with as little play as possible.
  • the blind bore 47 has a threaded section 50 to the outside of the pump housing 11, into which a screw plug 51 is screwed, which closes the blind bore 47, a sealing ring 52 being clamped between the pump housing 11 and the screw plug 51.
  • the sliding block 46 can be inserted into the bore 47 from the outside of the pump housing 11.
  • the roller ring 18, the bolt 30 and the sliding block 46 can be taken over essentially unchanged from known fuel injection pumps with an adjustable roller ring.
  • the position of the blind bore 47 for the sliding block 46 is preferably selected so that it can be drilled with little effort in an automated production of the pump housing 11.
  • the locking screw 51 and the sealing ring 52 are standard parts, so that the blocking of the roller ring 18 is achieved with simple means.

Abstract

The fuel injection pump has a pump piston (13) working in a cylinder bore (10), which piston is driven by a cam drive (14) in both a reciprocating and a rotating motion. The cam drive (14) comprises a rotating cam plate (17) coupled to a drive shaft (16) and a fixed roller ring (18), on the rollers (20) of which the cam plate is supported. The roller ring (18) is locked by a bolt (30), engaging radially in this, which bolt on the other side is supported in a radial bore (32) in a sliding block (33). The sliding block (33) is displaceable along its longitudinal axis in a longitudinal slot (36) in the inside of the pump housing (11) but arranged tangentially to the roller ring (18) with little play. <IMAGE>

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einer Kraftstoffeinspritzpumpe für Brennkraftmaschinen nach der Gattung des Anspruchs 1.The invention relates to a fuel injection pump for internal combustion engines according to the preamble of claim 1.

Eine solche Kraftstoffeinspritzpumpe ist durch die DE-OS 38 05 033 bekannt. Diese Kraftstoffeinspritzpumpe weist einen Pumpenkolben auf, der von einem Nockenantrieb in eine Dreh-Hub-Bewegung versetzt wird. Der Nockenantrieb besteht aus einem im wesentlichen ortsfesten Teil, der als Rollenring ausgebildet ist, und einem von einer Antriebswelle angetriebenen rotierenden Teil, der als eine Hubscheibe ausgebildet ist. Der im wesentlichen ortsfeste Teil ist mittels einer Spritzverstelleinrichtung gegenüber dem rotierenden Teil verdrehbar, wodurch die Zuordnung der Hubbewegung des Pumpenkolbens zum Drehwinkel der Antriebswelle änderbar ist. Der Pumpenkolben begrenzt einen Pumpenarbeitsraum, der über ein elektrisch gesteuertes Ventil während des Pumphubes des Pumpenkolbens Zur Steuerung des einspritzwirksamen Pumpenkolbenhubs entlastbar ist. In den im wesentlichen ortsfesten Teil des Nockenantriebs greift radial ein Bolzen ein, der andererseits über ein Gleitstuck in einem Kolben gelagert ist. Der Kolben ist in einem kraftstoffgefüllten Zylinder angeordnet und vom Kraftstoffdruck beaufschlagt tangential zum ortsfesten Teil verschiebbar, der hierbei verdreht wird. Es wird jedoch angestrebt, die Spritzverstellung in Abhängigkeit von unterschiedlichen Betriebsparametern ebenfalls durch das elektrisch gesteuerte Ventil zu bewirken, so daß hierfür die Verstellung des ortsfesten Teils nicht mehr erforderlich ist.Such a fuel injection pump is known from DE-OS 38 05 033. This fuel injection pump has a pump piston which is set into a rotary-stroke movement by a cam drive. The cam drive consists of an essentially stationary part, which is designed as a roller ring, and a rotating part driven by a drive shaft, which is designed as a lifting disk. The essentially stationary part can be rotated relative to the rotating part by means of a spray adjustment device, as a result of which the assignment of the stroke movement of the pump piston to the angle of rotation of the drive shaft can be changed. The pump piston delimits a pump work space, which can be relieved via an electrically controlled valve during the pump stroke of the pump piston in order to control the injection-effective pump piston stroke. A bolt engages radially in the essentially stationary part of the cam drive, which is, on the other hand, mounted in a piston via a slide piece. The piston is arranged in a fuel-filled cylinder and, when subjected to the fuel pressure, is displaceable tangentially to the stationary part, which is rotated in the process. However, the aim is to To effect spray adjustment depending on different operating parameters also by the electrically controlled valve, so that the adjustment of the fixed part is no longer necessary for this.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Kraftstoffeinspritzpumpe mit den kennzeichnenden Merkmalen des Anspruchs 1 hat den Vorteil, daß der im wesentlichen ortsfeste Teil des Nockenantriebs unter Verwendung von Bauteilen bekannter Kraftstoffeinspritzpumpen mit Spritzverstelleinrichtung festgelegt ist, so daß ausgehend von bekannten Kraftstoffeinspritzpumpen nur wenige Änderungen erforderlich sind.The fuel injection pump according to the invention with the characterizing features of claim 1 has the advantage that the substantially stationary part of the cam drive is fixed using components of known fuel injection pumps with injection adjustment device, so that only a few changes are required based on known fuel injection pumps.

In den Unteransprüchen sind vorteilhafte Ausgestaltungen und Weiterbildungen der erfindungsgemäßen Kraftstoffeinspritzpumpe gekennzeichnet. Bei der Ausbildung der Aufnahme nach Anspruch 2 erfordert diese keine zusätzliche Dichtstelle am Pumpengehäuse. Durch die Ausbildung gemäß Anspruch 3 ist ein Verschieben des Gleitstücks zum Ausgleich von Toleranzen ermöglicht, ein Ausschlagen der Aufnahme durch auf das Gleitstück wirkende Stöße jedoch verhindert. Durch die Ausbildung der Aufnahme nach Anspruch 5 ist eine Montage des Gleitstücks von der Außenseite des Pumpengehäuses ermöglicht.Advantageous refinements and developments of the fuel injection pump according to the invention are characterized in the subclaims. When forming the receptacle according to claim 2, this does not require an additional sealing point on the pump housing. The design according to claim 3 enables the sliding piece to be displaced to compensate for tolerances, but prevents the receptacle from knocking out due to impacts acting on the sliding piece. The design of the receptacle according to claim 5 enables the slider to be mounted from the outside of the pump housing.

Zeichnungdrawing

Zwei Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 eine Kraftstoffeinspritzpumpe im längsschnitt mit einem ersten Ausführungsbeispiel und Figur 2 einen in Figur 1 mit II bezeichneten Ausschnitt der Kraftstoffeinspritzpumpe mit einem zweiten Ausführungsbeispiel.Two embodiments of the invention are shown in the drawing and explained in more detail in the following description. FIG. 1 shows a fuel injection pump in longitudinal section with a first exemplary embodiment, and FIG. 2 shows a detail of the fuel injection pump designated II in FIG. 1 with a second exemplary embodiment.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Eine in der Figur 1 dargestellte Kraftstoffeinspritzpumpe der Verteilerbauart weist einen in einer Zylinderbohrung 10 in einer in ein Pumpengehäuse 11 eingesetzten Buchse 12 arbeitenden Pumpenkolben 13 auf. Der Pumpenkolben 13 wird durch einen Nockenantrieb 14 in eine hin- und hergehende und zugleich rotierende Bewegung versetzt. Der Nockenantrieb 14 besteht aus einer mit einer Antriebswelle 16 der Kraftstoffeinspritzpumpe gekoppelten Hubscheibe 17, als rotierendem Teil und einem Rollenring 18 als ortsfestem Teil. Die Hubscheibe 17 weist eine Nockenbahn mit Stirnnockenerhebungen 19 auf, die auf im Rollenring 18 gehaltenen Rollen 20 aufliegt. Der Pumpenkolben 13 einerseits sowie ein in das Pumpengehäuse 11 eingesetztes elektrisch gesteuertes Ventil 22 andererseits begrenzen in der Zylinderbohrung 10 einen Pumpenarbeitsraum 23. Der Innenraum 24 der Kraftstoffeinspritzpumpe wird durch eine in der Kraftstoffeinspritzpumpe integrierte Förderpumpe 25 mit Kraftstoff gefüllt und dient als Saugraum, aus dem der Pumpenarbeitsraum versorgt wird.A fuel injection pump of the distributor type shown in FIG. 1 has a pump piston 13 operating in a cylinder bore 10 in a bushing 12 inserted into a pump housing 11. The pump piston 13 is set in a reciprocating and at the same time rotating movement by a cam drive 14. The cam drive 14 consists of a lifting disk 17, which is coupled to a drive shaft 16 of the fuel injection pump, as a rotating part and a roller ring 18 as a stationary part. The lifting disk 17 has a cam track with end cam elevations 19, which rests on rollers 20 held in the roller ring 18. The pump piston 13 on the one hand and an electrically controlled valve 22 inserted into the pump housing 11 on the other hand delimit a pump working chamber 23 in the cylinder bore 10. The interior 24 of the fuel injection pump is filled with fuel by a feed pump 25 integrated in the fuel injection pump and serves as a suction chamber from which the Pump work space is supplied.

Der Rollenring 18 weist einen zylinderförmigen Außenumfang 26 auf, über den er in einer Bohrung 27 im Pumpengehäuse 11 radial gelagert ist. In den Rollenring 18 greift radial ein Bolzen 30 ein, der im Rollenring durch einen Stift 31 gesichert ist. Das aus dem Rollenring 18 ragende Ende des Bolzens 30 ist in einer radialen Bohrung 32 in einem als Gleitstück dienenden Gleitstein 33 gelagert. Der Gleitstein 33 ist in einer sich etwa parallel zur Längsachse 34 der Antriebswelle 16 bzw. Kraftstoffeinspritzpumpe erstreckenden, zum Innenraum 24 offenen Längsnut 36 in der Innenseite des Pumpengehäuses 11 axial verschiebbar angeordnet. Der Gleitstein 33 ist zwischen dem Boden 37 der Längsnut 36 und dem Außenumfang 26 des Rollenrings 18 mit geringem Spiel geführt. Tangential zum Rollenring 18 ist der Gleitstein 33 in der Längsnut 36 mit möglichst geringem Spiel angeordnet, um eine Drehbewegung des Rollenrings zu blockieren und um ein Ausschlagen des Gleitsteins in der Längsnut unter auf den Rollenring wirkenden und sich über den Gleitstein abstützenden Stößen zu verhindern. In der Bohrung 32 im Gleitstein 33 ist der Bolzen 30 mit kleinem Spiel schwenkbar angeordnet und entlang seiner Längsachse 38 verschiebbar.The roller ring 18 has a cylindrical outer circumference 26, via which it is mounted radially in a bore 27 in the pump housing 11. A pin 30 engages radially in the roller ring 18 and is secured in the roller ring by a pin 31. The end of the bolt 30 protruding from the roller ring 18 is mounted in a radial bore 32 in a sliding block 33 serving as a sliding piece. The sliding block 33 is arranged in an axially displaceable manner in a longitudinal groove 36, which extends approximately parallel to the longitudinal axis 34 of the drive shaft 16 or fuel injection pump and is open to the interior 24, in the inside of the pump housing 11. The sliding block 33 is guided between the bottom 37 of the longitudinal groove 36 and the outer circumference 26 of the roller ring 18 with little play. Tangential to the roller ring 18, the sliding block 33 is arranged in the longitudinal groove 36 with as little play as possible in order to block a rotary movement of the roller ring and around prevent the sliding block from knocking out in the longitudinal groove under impacts acting on the roller ring and supported by the sliding block. In the bore 32 in the sliding block 33, the bolt 30 is pivotably arranged with little play and can be displaced along its longitudinal axis 38.

Hierdurch ist ein Ausgleich von Abstands- und Winkelfehlern zwischen dem Rollenring 18 und dem Gleitstein 33 ermöglicht, ohne daß dies zu einer Verspannung des Bolzens 30 führt. Von bekannten Kraftstoffeinspritzpumpen mit verstellbarem Rollenring können der Rollenring 18 sowie der Bolzen 30 unverändert übernommen werden. Eine zusätzliche Dichtstelle ist bei der Blockierung des Rollenrings nicht erforderlich.This makes it possible to compensate for distance and angle errors between the roller ring 18 and the sliding block 33, without this leading to a tensioning of the bolt 30. The roller ring 18 and the bolt 30 can be adopted unchanged from known fuel injection pumps with an adjustable roller ring. An additional sealing point is not necessary when the roller ring is blocked.

Durch das Ventil 22 wird eine Verbindung des Innenraums 24 mit dem Pumpenarbeitsraum 23 gesteuert. Beim Saughub des Pumpenkolbens 13 ist das Ventil 22 geöffnet und Kraftstoff strömt aus dem Innenraum 24 durch einen Kanal 40 sowie das Ventil 22 in den Pumpenarbeitsraum 23. Beim Druckhub des Pumpenkolbens 13 wird das Ventil 22 für die Dauer der gewählten Hochdruckförderung des Pumpenkolbens geschlossen und über eine Verteileröffnung 41 am Umfang des Pumpenkolbens 13 wird der auf Hochdruck gebrachte Kraftstoff bei entsprechender Drehung des Pumpenkolbens in strichliniert dargestellte Förderkanäle 42 gefördert, die über Einspritzleitungen mit den Einspritzstellen der Brennkraftmaschine verbunden sind. Die Schließdauer und damit die Hochdruckeinspritzmenge sowie der den Beginn der Hochdruckeinspritzphase bestimmende Schließzeitpunkt des Ventils 22 wird durch ein nicht dargestelltes Steuergerät bestimmt. Zur Erfassung der Drehzahl sowie Drehlage der Antriebswelle 16 der Kraftstoffeinspritzpumpe ist ein Drehgeber 43 vorgesehen, der mit dem Steuergerät verbunden ist. Durch das Steuergerät können weitere Betriebsparameter wie beispielsweise Last, Temperatur etc. der mit der Kraftstoffeinspritzpumpe betriebenen Brennkraftmaschine berücksichtigt werden.A connection of the interior space 24 to the pump work space 23 is controlled by the valve 22. During the suction stroke of the pump piston 13, the valve 22 is opened and fuel flows from the interior 24 through a channel 40 and the valve 22 into the pump working space 23. During the pressure stroke of the pump piston 13, the valve 22 is closed and over for the duration of the selected high-pressure delivery of the pump piston a distributor opening 41 on the circumference of the pump piston 13, the fuel brought to high pressure is conveyed with corresponding rotation of the pump piston into delivery channels 42 shown in broken lines, which are connected via injection lines to the injection points of the internal combustion engine. The closing time and thus the high-pressure injection quantity and the closing time of the valve 22 which determines the start of the high-pressure injection phase is determined by a control unit (not shown). A rotary encoder 43, which is connected to the control unit, is provided for detecting the speed and the rotational position of the drive shaft 16 of the fuel injection pump. The control unit can take into account further operating parameters such as, for example, load, temperature, etc., of the internal combustion engine operated with the fuel injection pump.

Bei einem in Figur 2 dargestellten zweiten Ausführungsbeispiel sind der Rollenring 18 und der Bolzen 30 wie beim ersten Ausführungsbeispiel beschrieben, ausgebildet. Der Gleitstein 46 ist jedoch abweichend vom ersten Ausführungsbeispiel in einer sich etwa parallel zur Pumpenlängsachse 34 erstreckenden Sackbohrung 47 im Pumpengehäuse 11 angeordnet. Der Bolzen 30 ragt durch eine Öffnung 48 im Pumpengehäuse 11 zwischen Innenraum 24 und Sackbohrung 47 in die Bohrung 49 im Gleitstein 46. Der Gleitstein 46 ist in der Sackbohrung 47 axial verschiebbar, quer zu seiner Längsachse jedoch mit möglichst geringem Spiel angeordnet. Die Sackbohrung 47 weist zur Außenseite des Pumpengehäuses 11 einen Gewindeabschnitt 50 auf, in den eine Verschlußschraube 51 eingeschraubt ist, die die Sackbohrung 47 verschließt, wobei zwischen dem Pumpengehäuse 11 und der Verschlußschraube 51 ein Dichtring 52 eingespannt ist. Der Gleitstein 46 ist von der Außenseite des Pumpengehäuses 11 in die Bohrung 47 einsetzbar. Beim zweiten Ausführungsbeispiel können der Rollenring 18, der Bolzen 30 sowie der Gleitstein 46 im wesentlichen unverändert von bekannten Kraftstoffeinspritzpumpe mit verstellbarem Rollenring übernommen werden. Die Lage der Sackbohrung 47 für den Gleitstein 46 ist vorzugsweise so gewählt, daß diese bei einer automatisierten Fertigung des Pumpengehäuses 11 mit geringem Aufwand gebohrt werden kann. Die Verschlußschraube 51 sowie der Dichtring 52 sind Normteile, so daß die Blockierung des Rollenrings 18 mit einfachen Mitteln erreicht ist.In a second exemplary embodiment shown in FIG. 2, the roller ring 18 and the bolt 30 are designed as described in the first exemplary embodiment. In contrast to the first exemplary embodiment, the sliding block 46 is arranged in a blind bore 47 in the pump housing 11 which extends approximately parallel to the longitudinal axis 34 of the pump. The bolt 30 protrudes through an opening 48 in the pump housing 11 between the interior 24 and the blind bore 47 into the bore 49 in the sliding block 46. The sliding block 46 is axially displaceable in the blind bore 47, but is arranged transversely to its longitudinal axis with as little play as possible. The blind bore 47 has a threaded section 50 to the outside of the pump housing 11, into which a screw plug 51 is screwed, which closes the blind bore 47, a sealing ring 52 being clamped between the pump housing 11 and the screw plug 51. The sliding block 46 can be inserted into the bore 47 from the outside of the pump housing 11. In the second embodiment, the roller ring 18, the bolt 30 and the sliding block 46 can be taken over essentially unchanged from known fuel injection pumps with an adjustable roller ring. The position of the blind bore 47 for the sliding block 46 is preferably selected so that it can be drilled with little effort in an automated production of the pump housing 11. The locking screw 51 and the sealing ring 52 are standard parts, so that the blocking of the roller ring 18 is achieved with simple means.

Claims (5)

Kraftstoffeinspritzpumpe für Brennkraftmaschinen mit wenigstens einem Pumpenkolben (13), der von einem Nockenantrieb (14) rotierend und zugleich hin- und hergehend bewegt wird, der aus einem im wesentlichen ortsfesten Teil (18) und einem von einer Antriebswelle (16) angetriebenen rotierenden Teil (17) besteht, wobei eine Drehstellung des im wesentlichen ortsfesten Teils (18) durch einen einerseits in diesen radial eingreifenden Bolzen (30) einstellbar ist, der andererseits in einem Gleitstück (33; 46) gelagert ist, und mit einem durch den Pumpenkolben (13) begrenzten Pumpenarbeitsraum (23), der über ein elektrisch gesteuertes Ventil (22) während des Pumphubs des Pumpenkolbens (13) zur Steuerung des einspritzwirksamen Pumpenkolbenhubs entlastbar ist, dadurch gekennzeichnet, daß das Gleitstück (33; 46) in einer Aufnahme (36; 47) in einem Gehäuseteil (11) der Kraftstoffeinspritzpumpe etwa parallel zur Längsachse (34) der Kraftstoffeinspritzpumpe axial verschiebbar, jedoch tangential zum ortsfesten Teil (18) mit geringem Spiel geführt angeordnet ist und daß der Zeitpunkt des Schließens des Ventils zur Steuerung des Spritzbeginns in Abhängigkeit von Betriebsparametern der Brennkraftmaschine gesteuert wird.Fuel injection pump for internal combustion engines with at least one pump piston (13), which is rotated and reciprocated at the same time by a cam drive (14), which consists of an essentially stationary part (18) and a rotating part (18) driven by a drive shaft (16) 17), whereby a rotational position of the essentially stationary part (18) can be adjusted by a bolt (30) which engages radially on the one hand, which is mounted on the other hand in a slide (33; 46), and with one by the pump piston (13 ) limited pump working space (23), which can be relieved via an electrically controlled valve (22) during the pumping stroke of the pump piston (13) for controlling the injection-effective pump piston stroke, characterized in that the slide (33; 46) in a receptacle (36; 47 ) axially displaceable in a housing part (11) of the fuel injection pump approximately parallel to the longitudinal axis (34) of the fuel injection pump, but tangenti al to the stationary part (18) is arranged with little play and that the time of closing the valve to control the start of spraying is controlled depending on the operating parameters of the internal combustion engine. Kraftstoffeinspritzpumpe nach Anspruch 1, dadurch gekennzeichnet, daß die Aufnahme als eine zum Innenraum (11) der Kraftstoffeinspritzpumpe hin offene Längsnut (36) ausgebildet ist.Fuel injection pump according to Claim 1, characterized in that the receptacle is designed as a longitudinal groove (36) which is open towards the interior (11) of the fuel injection pump. Kraftstoffeinspritzpumpe nach Anspruch 2, dadurch gekennzeichnet, daß das Gleitstück (33) zwischen dem Boden (37) der Längsnut (36) und dem Außenumfang (26) des ortsfesten Teils (18) mit geringem Spiel angeordnet ist.Fuel injection pump according to Claim 2, characterized in that the sliding piece (33) is arranged between the bottom (37) of the longitudinal groove (36) and the outer circumference (26) of the stationary part (18) with little play. Kraftstoffeinspritzpumpe nach Anspruch 1, dadurch gekennzeichnet, daß die Aufnahme als eine Sackbohrung (47) im Gehäuseteil (11) mit einer seitlichen Öffnung (48) zum Pumpeninnenraum (11) ausgebildet ist.Fuel injection pump according to Claim 1, characterized in that the receptacle is designed as a blind bore (47) in the housing part (11) with a lateral opening (48) to the pump interior (11). Kraftstoffeinspritzpumpe nach Anspruch 4, dadurch gekennzeichnet, daß die Sackbohrung (47) zur Außenseite des Gehäuseteils (11) hin offen ist und dort einen Gewindeabschnitt (50) aufweist, in den eine Verschlußschraube (51) einschraubbar ist.Fuel injection pump according to Claim 4, characterized in that the blind bore (47) is open towards the outside of the housing part (11) and there has a threaded section (50) into which a screw plug (51) can be screwed.
EP91114895A 1990-10-10 1991-09-04 Fuel injection pump for internal combustion engine Expired - Lifetime EP0480173B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9014068U DE9014068U1 (en) 1990-10-10 1990-10-10
DE9014068U 1990-10-10

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EP0480173A1 true EP0480173A1 (en) 1992-04-15
EP0480173B1 EP0480173B1 (en) 1994-12-28

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EP91114895A Expired - Lifetime EP0480173B1 (en) 1990-10-10 1991-09-04 Fuel injection pump for internal combustion engine

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EP (1) EP0480173B1 (en)
JP (1) JP3119908B2 (en)
DE (2) DE9014068U1 (en)
ES (1) ES2067107T3 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5355857A (en) * 1992-09-30 1994-10-18 Robert Bosch Gmbh Fuel injection pump for internal combustion engines
WO1995018300A1 (en) * 1993-12-29 1995-07-06 Robert Bosch Gmbh Fuel-injection pump

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3355681B2 (en) * 1993-02-15 2002-12-09 東ソー株式会社 Column with built-in filter for liquid chromatography

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE963825C (en) * 1954-09-12 1957-05-16 Bosch Gmbh Robert Fuel injection pump for multi-cylinder internal combustion engines
DE1943674A1 (en) * 1969-07-23 1971-03-11 Orange Einspritzgeraete Kg Injection timing adjustment device for distributor injection pumps
GB2192239A (en) * 1986-07-01 1988-01-06 Diesel Kiki Co Fuel injection pump device
DE3913764A1 (en) * 1988-04-27 1989-11-09 Diesel Kiki Co DISTRIBUTOR FUEL INJECTION PUMP

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE963825C (en) * 1954-09-12 1957-05-16 Bosch Gmbh Robert Fuel injection pump for multi-cylinder internal combustion engines
DE1943674A1 (en) * 1969-07-23 1971-03-11 Orange Einspritzgeraete Kg Injection timing adjustment device for distributor injection pumps
GB2192239A (en) * 1986-07-01 1988-01-06 Diesel Kiki Co Fuel injection pump device
DE3913764A1 (en) * 1988-04-27 1989-11-09 Diesel Kiki Co DISTRIBUTOR FUEL INJECTION PUMP

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5355857A (en) * 1992-09-30 1994-10-18 Robert Bosch Gmbh Fuel injection pump for internal combustion engines
WO1995018300A1 (en) * 1993-12-29 1995-07-06 Robert Bosch Gmbh Fuel-injection pump

Also Published As

Publication number Publication date
JP3119908B2 (en) 2000-12-25
ES2067107T3 (en) 1995-03-16
DE59104054D1 (en) 1995-02-09
DE9014068U1 (en) 1992-02-13
JPH04262054A (en) 1992-09-17
EP0480173B1 (en) 1994-12-28

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