EP1891323A1 - Fuel metering unit for a high-pressure fuel pump and associated high-pressure fuel pump - Google Patents

Fuel metering unit for a high-pressure fuel pump and associated high-pressure fuel pump

Info

Publication number
EP1891323A1
EP1891323A1 EP06725632A EP06725632A EP1891323A1 EP 1891323 A1 EP1891323 A1 EP 1891323A1 EP 06725632 A EP06725632 A EP 06725632A EP 06725632 A EP06725632 A EP 06725632A EP 1891323 A1 EP1891323 A1 EP 1891323A1
Authority
EP
European Patent Office
Prior art keywords
metering unit
fuel metering
anchor bolt
valve piston
bearing bush
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
EP06725632A
Other languages
German (de)
French (fr)
Other versions
EP1891323B1 (en
Inventor
Nestor Rodriguez-Amaya
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1891323A1 publication Critical patent/EP1891323A1/en
Application granted granted Critical
Publication of EP1891323B1 publication Critical patent/EP1891323B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/34—Varying fuel delivery in quantity or timing by throttling of passages to pumping elements or of overflow passages, e.g. throttling by means of a pressure-controlled sliding valve having liquid stop or abutment

Definitions

  • the invention is based on a fuel metering unit for suction-side flow rate control of
  • a high-pressure fuel pump of an internal combustion engine wherein the fuel metering unit comprises a solenoid-operated control valve with a valve piston, wherein the electromagnet comprises an armature and an anchor bolt, and with a bearing bush.
  • Such a fuel metering unit is known, for example, from DE 102 42 219 A1.
  • the armature of the electromagnet is surrounded by a bearing bush and axially displaceably guided.
  • the invention is based on the object
  • the indicator comprises a solenoid-operated control valve with a valve piston
  • the electromagnet comprises an armature and an anchor bolt
  • armature, anchor bolt and valve piston are interconnected and with a
  • Anchor is soft annealed to optimize the magnetic properties.
  • the anchor bolt from a more wear-resistant material than, for example, hardened steel.
  • the surface roughness of the anchor bolt can be kept very small, which in turn has a positive effect on the friction forces between bearing bush and Anchor bolt affects and drastically reduces wear.
  • a second bearing bush between the anchor bolt and the valve piston may be arranged, wherein the second bearing bush, the anchor bolt axially displaceable leads.
  • the second bearing bush at the end remote from the valve piston end of the anchor bolt and to guide the anchor bolt in the second bearing bush axially displaceable.
  • the stated advantages are also achieved and the bushings are loaded very evenly. Which of the variants mentioned in the individual case is given preference depends on the other boundary conditions of the individual case and is to be decided by the contractor responsible for the design in each case.
  • the anchor bolt protrudes beyond the magnet when the second bearing bush is arranged at the end of the anchor bolt facing away from the valve piston.
  • the second bearing bush can be advantageously secured in a magnet pot of the electromagnet.
  • the bushings arranged between the magnet and the valve piston can advantageously be fastened in a valve housing of the fuel metering unit.
  • bearing bushes are made of bronze.
  • plastic in particular fuel-resistant and heat-resistant plastic.
  • valve piston can be guided in the valve housing.
  • Figure 1 shows a first embodiment of a Kraftstoffzumessaku invention
  • FIG. 2 shows a second embodiment of a fuel metering unit according to the invention.
  • the fuel metering unit according to FIGS. 1 and 2 is based on an electromagnet 1 with integrated control valve 3.
  • the most important components of the electromagnet 1 are a magnet coil 5, an armature 7 with anchor bolt 9 and a magnet pot 11 which partially surrounds the magnet coil 5 and the armature 7 ,
  • the entire fuel metering unit is arranged in a high-pressure fuel pump, not shown.
  • the magnet pot 11 serves simultaneously as a sealing element, as a magnetic yoke and as a fastener in the high-pressure pump.
  • the attachment function is essentially fulfilled by the flange 13.
  • the control valve 3 has a valve housing 15, which merges into a widening 17, which at the same time forms the frontal end of the magnet pot 11.
  • an axial bore 19 is formed, which is arranged coaxially with the anchor bolt 9 of the electromagnet 1.
  • the axial bore 19 receives a displaceable sleeve-shaped valve piston 21, in the interior of which a compression spring 23 is arranged.
  • the Compression spring 23 is supported at one end on a bottom 25 of the valve piston 21. At the other end, the compression spring 23 is supported on a spring plate 27 located in the axial bore 19. At the end facing away from the spring plate 27 of the valve piston 21 is this with one end of the
  • the compression spring 23 ensures that each adjusting movement of the anchor bolt 9 is transmitted directly to the valve piston 21.
  • An opening 29 in the spring plate 27 connects the interior (without reference numeral) of the valve piston 21 with a not shown pre-feed pump of the fuel injection system.
  • valve housing 15 In the valve housing 15 a plurality of radially directed control openings 31 are arranged.
  • the control openings 31 are in hydraulic operative connection with the low-pressure region of the high-pressure fuel pump, not shown.
  • Valve piston 21 and the control openings 31 can also be reversed. In this case, the control openings 31 would then be connected to the pressure side of the prefeed pump, while the opening 29 would be hydraulically connected to the low-pressure region of the high-pressure pump.
  • the upper half of Figure 1 shows the control valve 11 in the open position, in which the control port 31 is completely released by the valve piston 21.
  • the control valve 3 In the lower half of Figure 1, the control valve 3 is shown in its closed position.
  • the magnetic force of the energized electromagnet 1 via the armature 7 and the anchor bolt 9 acts on the valve piston 21 and moves this against the compression spring 23 in said closing division.
  • the compression spring 23 can move the valve piston 21 in the open position as soon as the energization of the electromagnet 1 and thus its acting on the armature 7 and the anchor bolt 9 magnetic force is reduced accordingly.
  • a compensation bore 33 is provided in the bottom 25 of the valve piston 21 . Also in the anchor 7 compensating holes 35 are provided.
  • the anchor bolt 9 projects beyond the armature 7 into the magnet pot 11.
  • a first bearing bush 37 is pressed in the valve housing 15.
  • the first bearing bush 37 serves to guide the anchor bolt 9 and with it the armature 7 in the axial direction. Since the anchor bolt 9 can be made of a wear-resistant material, such as hardened steel, the bearing of the moving parts of the electromagnet 1 by means of the first bearing bush 37 is very durable and virtually wear-free. Because of the naturally small diameter of the anchor bolt 9 in comparison to the outer diameter of the armature 7 and the friction between the first bearing bush 37 and the anchor bolt 9 is very low.
  • a second bearing bush 39 is pressed into the magnet pot 11 on the end of the anchor bolt 9 facing away from the valve piston 21. As a result, the tilting of the anchor bolt 9 is prevented.
  • the two-sided guidance of the anchor bolt 9 also ensures that the armature 7 can not escape in the radial direction, if, for example, the magnetic forces exerted by the magnetic coil 5 on the armature 7 have a radial component. Because of the precise and low-wear guidance of the anchor bolt 9 in the bearing bushes 37 and 39 is also ensured that the armature 7 does not come into contact with the magnet pot 11 and thus there neither friction nor wear can occur.
  • both the first bearing bush 37 and the second bearing bush 39 are arranged in the region between the armature 7 and the valve piston 21.
  • Bearing bush 37 and 39 are pressed into the magnet pot 11 and are spaced from each other in the axial direction of the anchor bolt 9. As a result, a tilting of the anchor bolt 9 and thus also a grinding or contact between the armature 7 and the magnet pot 11 is effectively prevented. in the
  • this second embodiment also has the same advantages of the first embodiment.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

The invention relates to a fuel metering unit, in which the displaceable parts of an electromagnet are guided through two bushings in an axial direction, the bushings being located at a distance from one another. The bushings guide the armature bolt, which can be produced from a wear-resistant material, such as for example tempered steel.

Description

R . 311147 R. 311147
13.05.2005 THE/GGA13.05.2005 THE / GGA
Robert Bosch GmbH, 70442 StuttgartRobert Bosch GmbH, 70442 Stuttgart
Kraftstoffzumesseinheit für eine Kraftstoffhochdruckpumpe und KraftstoffhochdruckpumpeFuel metering unit for a high-pressure fuel pump and high-pressure fuel pump
Stand der TechnikState of the art
Die Erfindung geht aus von einer Kraftstoffzumesseinheit zur saugseitigen Fördermengenregelung derThe invention is based on a fuel metering unit for suction-side flow rate control of
Kraftstoffhochdruckpumpe einer Brennkraftmaschine, wobei die Kraftstoffzumesseinheit ein von einem Elektromagnet betätigtes Regelventil mit einem Ventilkolben aufweist, wobei der Elektromagnet einen Anker und einen Ankerbolzen umfasst, und mit einer Lagerbuchse.A high-pressure fuel pump of an internal combustion engine, wherein the fuel metering unit comprises a solenoid-operated control valve with a valve piston, wherein the electromagnet comprises an armature and an anchor bolt, and with a bearing bush.
Eine solche Kraftstoffzumesseinheit ist beispielsweise aus der DE 102 42 219 Al bekannt.Such a fuel metering unit is known, for example, from DE 102 42 219 A1.
Bei dieser Kraftstoffzumesseinheit wird der Anker des Elektromagneten von einer Lagerbuchse umfasst und axial verschiebbar geführt.In this fuel metering unit, the armature of the electromagnet is surrounded by a bearing bush and axially displaceably guided.
Der Erfindung liegt die Aufgabe zugrunde, eineThe invention is based on the object
Kraftstoffzumesseinheit mit besserem Betriebsverhalten und erhöhter Lebensdauer bereitzustellen.To provide fuel metering unit with better performance and increased life.
Diese Aufgabe wird erfindungsgemäß bei einer Kraftstoffzumesseinheit zur saugseitigenThis object is achieved according to the invention in a fuel metering unit for the suction side
Fördermengenregelung der Kraftstoffhochdruckpumpe einer Brennkraftmaschine, wobei die Kennzeichen ein von einem Elektromagnet betätigtes Regelventil mit einem Ventilkolben aufweist, wobei der Elektromagnet einen Anker und einen Ankerbolzen umfasst, und wobei Anker, Ankerbolzen und Ventilkolben miteinander verbunden sind und mit einerFlow control of the high-pressure fuel pump a Internal combustion engine, wherein the indicator comprises a solenoid-operated control valve with a valve piston, wherein the electromagnet comprises an armature and an anchor bolt, and wherein armature, anchor bolt and valve piston are interconnected and with a
Lagerbuchse, dadurch gelöst, dass eine erste Lagerbuchse zwischen dem Ankerbolzen und dem Ventilkolben angeordnet ist, und dass die erste Lagerbuchse den Ankerbolzen axial verschiebbar führt und lagert.Bushing, solved in that a first bearing bush between the anchor bolt and the valve piston is arranged, and that the first bearing bush axially displaceably leads and supports the anchor bolt.
Vorteile der ErfindungAdvantages of the invention
Durch die erfindungsgemäße Führung der bewegten Teile der Kraftstoffzumesseinheit am Ankerbolzen wird die Reibung zwischen der Lagerbuchse und dem bewegten Teil deutlich verringert, weil der Durchmesser des Ankerbolzens sehr viel kleiner ist als der Durchmesser des Ankers, so dass sich die Kontaktfläche zwischen Lagerbuchse und dem zu lagernden Teil bei der erfindungsgemäßen Kraftstoffzumesseinheit drastisch reduziert.The inventive leadership of the moving parts of the fuel metering unit on the anchor bolt, the friction between the bearing bush and the moving part is significantly reduced, because the diameter of the anchor bolt is much smaller than the diameter of the armature, so that the contact surface between the bearing bush and to be stored Part drastically reduced in the fuel metering unit according to the invention.
Bei der aus dem Stand der Technik bekannten Kraftstoffzumesseinheit tritt ein nicht zu vernachlässigender Verschleiß beim Betrieb der erfindungsgemäßen Kraftstoffzumesseinheit auf, weil derIn the known from the prior art Kraftstoffzumesseinheit occurs a non-negligible wear during operation of the fuel metering unit according to the invention because of
Anker zur Optimierung der magnetischen Eigenschaften weich geglüht wird.Anchor is soft annealed to optimize the magnetic properties.
Außerdem ist es möglich, den Ankerbolzen aus einem verschleißfesteren Werkstoff als beispielsweise gehärtetem Stahl herzustellen. Durch eine geeigneteIn addition, it is possible to produce the anchor bolt from a more wear-resistant material than, for example, hardened steel. By a suitable
Oberflächenbearbeitung, wie beispielsweise Schleifen oder Superfinishen kann zudem die Oberflächenrauigkeit des Ankerbolzens sehr klein gehalten werden, was sich wiederum positiv auf die Reibungskräfte zwischen Lagerbuchse und Ankerbolzen auswirkt und den Verschleiß drastisch reduziert .Surface treatment, such as grinding or superfinishing, moreover, the surface roughness of the anchor bolt can be kept very small, which in turn has a positive effect on the friction forces between bearing bush and Anchor bolt affects and drastically reduces wear.
Im Ergebnis ist es dadurch möglich, eine Kraftstoffzumesseinheit bereitzustellen, derenAs a result, it is possible to provide a fuel metering unit whose
Ansprechverhalten verbessert wird, bei der die Hysterese zwischen einer Öffnungsbewegung und einer Schließbewegung im Vergliech zu herrkömmlichen KraftstoffZumesseinheiten auf ein Viertel verringert wird. Außerdem werden die Herstellungskosten reduziert, weil die erfindungsgemäße erste Lagerbuchse einen sehr viel kleineren Durchmesser aufweist und infolgedessen kostengünstiger herzustellen ist .Response is improved, in which the hysteresis between an opening movement and a closing movement in the Vergliech to conventional Kraftstoffumumsein units is reduced to a quarter. In addition, the manufacturing cost is reduced because the first bearing bush according to the invention has a much smaller diameter and consequently is cheaper to manufacture.
In weiterer vorteilhafter Ausgestaltung der Erfindung kann eine zweite Lagerbuchse zwischen dem Ankerbolzen und dem Ventilkolben angeordnet sein, wobei auch die zweite Lagerbuchse den Ankerbolzen axial verschiebbar führt. Durch diese zwei Lagerbuchsen, die vorteilhafterweise mit einem axialen Absatnd zueiander angeordnet sind, wird die Führung des Ankerbolzens weiter verbessert. Durch die zwei voneinander beabstandeten Lagerbuchsen kann der Ankerbolzen nicht mehr kippen oder seitlich ausweichen, so dass der Anker sehr gut fluchtend zu der Magnetspule geführt ist. Dadurch wird das Betriebsverhalten und die Lebensdauer der erfindungsgemäßen Kraftstoffzumesseinheit weiter verbessert .In a further advantageous embodiment of the invention, a second bearing bush between the anchor bolt and the valve piston may be arranged, wherein the second bearing bush, the anchor bolt axially displaceable leads. Through these two bushings, which are advantageously arranged with an axial Absatnd zueiander, the leadership of the anchor bolt is further improved. Due to the two spaced bearing bushes of the anchor bolt can not tilt or sideways dodge so that the armature is very well aligned with the solenoid. As a result, the operating behavior and the service life of the fuel metering unit according to the invention are further improved.
Alternativ ist es auch möglich, die zweite Lagerbuchse an dem dem Ventilkolben abgewandten Ende des Ankerbolzens anzuordnen und den Ankerbolzen auch in der zweiten Lagerbuchse axial verschiebbar zu führen. Dadurch werden die genannten Vorteile ebenfalls erreicht und die Lagerbuchsen werden sehr gleichmäßig belastet. Welcher der genannten Varianten im Einzelfall der Vorzug gegeben wird, hängt von den anderen Randbedingungen des Einzelfalls ab und ist von dem mit der Konstruktion beauftragten Fachmann im Einzelfall zu entscheiden.Alternatively, it is also possible to arrange the second bearing bush at the end remote from the valve piston end of the anchor bolt and to guide the anchor bolt in the second bearing bush axially displaceable. As a result, the stated advantages are also achieved and the bushings are loaded very evenly. Which of the variants mentioned in the individual case is given preference depends on the other boundary conditions of the individual case and is to be decided by the contractor responsible for the design in each case.
Vorteilhafterweise ragt der Ankerbolzen über den Magnet hinaus, wenn die zweite Lagerbuchse an dem dem Ventilkolben abgewandten Ende des Ankerbolzens angeordnet ist. In diesem Fall kann die zweite Lagerbuchse vorteilhafterweise in einem Magnettopf des Elektromagneten befestigt werden.Advantageously, the anchor bolt protrudes beyond the magnet when the second bearing bush is arranged at the end of the anchor bolt facing away from the valve piston. In this case, the second bearing bush can be advantageously secured in a magnet pot of the electromagnet.
Die zwischen dem Magnet und Ventilkolben angeordneten Lagerbuchsen können vorteilhafterweise in einem Ventilgehäuse der Kraftstoffzumesseinheit befestigt werden.The bushings arranged between the magnet and the valve piston can advantageously be fastened in a valve housing of the fuel metering unit.
Es hat sich bei praktischen Versuchen als vorteilhaft erwiesen, wenn die Lagerbuchsen aus Bronze hergestellt werden. Alternativ ist es auch möglich, die Lagerbuchsen aus Kunststoff, insbesondere kraftstoffbeständigem und hitzebeständigem Kunststoff, herzustellen.It has proven to be advantageous in practical experiments when the bearing bushes are made of bronze. Alternatively, it is also possible to produce the bearing bushes made of plastic, in particular fuel-resistant and heat-resistant plastic.
Falls erforderlich kann in weiterer vorteilhafter Ausgestaltung der Erfindung der Ventilkolben in dem Ventilgehäuse geführt werden.If necessary, in a further advantageous embodiment of the invention, the valve piston can be guided in the valve housing.
Weitere Vorteile und vorteilhafte Ausgestaltungen der Erfindung sind der nachfolgenden Zeichnung, deren Beschreibung und den Patentansprüchen entnehmbar. Alle in der Zeichnung, deren Beschreibung und den Patentansprüchen offenbarten Merkmale können sowohl einzeln als auch in beliebiger Kombination miteinander erfindungswesentlich sein.Further advantages and advantageous embodiments of the invention are the following drawings, the description and the claims removable. All of the features disclosed in the drawing, the description and the claims can be essential to the invention both individually and in any combination with one another.
Zeichnungen Es zeigen :drawings Show it :
Figur 1 ein erstes Ausführungsbeispiel einer erfindungsgemäßen Kraftstoffzumesseinheit, undFigure 1 shows a first embodiment of a Kraftstoffzumesseinheit invention, and
Figur 2 ein zweites Ausführungsbeispiel einer erfindungsgemäßen Kraftstoffzumesseinheit .2 shows a second embodiment of a fuel metering unit according to the invention.
Beschreibung der AusführungsbeispieleDescription of the embodiments
Die Kraftstoffzumesseinheit gemäß den Figuren 1 und 2 basiert auf einem Elektromagneten 1 mit integriertem Regelventil 3. Die wichtigsten Bauteile des Elektromagneten 1 sind eine Magnetspule 5, ein Anker 7 mit Ankerbolzen 9 und ein Magnettopf 11, der die Magnetspule 5 und den Anker 7 teilweise umschließt.The fuel metering unit according to FIGS. 1 and 2 is based on an electromagnet 1 with integrated control valve 3. The most important components of the electromagnet 1 are a magnet coil 5, an armature 7 with anchor bolt 9 and a magnet pot 11 which partially surrounds the magnet coil 5 and the armature 7 ,
Die gesamte Kraftstoffzumesseinheit ist in einer nicht dargestellten Kraftstoffhochdruckpumpe angeordnet. Der Magnettopf 11 dient hierbei gleichzeitig als Abdichtelement, als magnetischer Rückschluss und als Befestigungselement in der Hochdruckpumpe. Die Befestigungsfunktion wird im Wesentlichen durch den Flansch 13 erfüllt.The entire fuel metering unit is arranged in a high-pressure fuel pump, not shown. The magnet pot 11 serves simultaneously as a sealing element, as a magnetic yoke and as a fastener in the high-pressure pump. The attachment function is essentially fulfilled by the flange 13.
Das Regelventil 3 besitzt ein Ventilgehäuse 15, welches in eine Verbreiterung 17 übergeht, die zugleich den stirnseitigen Abschluss des Magnettopfes 11 bildet.The control valve 3 has a valve housing 15, which merges into a widening 17, which at the same time forms the frontal end of the magnet pot 11.
In dem Ventilgehäuse 15 ist eine Axialbohrung 19 ausgebildet, die koaxial zu dem Ankerbolzen 9 des Elektromagneten 1 angeordnet ist. Die Axialbohrung 19 nimmt einen verschiebbaren hülsenförmigen Ventilkolben 21 auf, in dessen Innenraum eine Druckfeder 23 angeordnet ist. Die Druckfeder 23 stützt sich einenends an einem Boden 25 des Ventilkolbens 21 ab. Anderenends stützt sich die Druckfeder 23 an einem in der Axialbohrung 19 befindlichen Federteller 27 ab. An dem dem Federteller 27 abgewandten Ende des Ventilkolbens 21 steht dieser mit dem einen Ende desIn the valve housing 15, an axial bore 19 is formed, which is arranged coaxially with the anchor bolt 9 of the electromagnet 1. The axial bore 19 receives a displaceable sleeve-shaped valve piston 21, in the interior of which a compression spring 23 is arranged. The Compression spring 23 is supported at one end on a bottom 25 of the valve piston 21. At the other end, the compression spring 23 is supported on a spring plate 27 located in the axial bore 19. At the end facing away from the spring plate 27 of the valve piston 21 is this with one end of the
Ankerbolzens 9 in Anlage. Die Druckfeder 23 sorgt dafür, dass jede Stellbewegung des Ankerbolzens 9 unmittelbar auf den Ventilkolben 21 übertragen wird.Anchor bolt 9 in attachment. The compression spring 23 ensures that each adjusting movement of the anchor bolt 9 is transmitted directly to the valve piston 21.
Eine Öffnung 29 im Federteller 27 verbindet den Innenraum (ohne Bezugszeichen) des Ventilkolbens 21 mit einer nicht dargestellten Vorförderpumpe des Kraftstoffeinspritzsystems .An opening 29 in the spring plate 27 connects the interior (without reference numeral) of the valve piston 21 with a not shown pre-feed pump of the fuel injection system.
In dem Ventilgehäuse 15 sind mehrere radial gerichtete Steueröffnungen 31 angeordnet. Die Steueröffnungen 31 stehen mit dem Niederdruckbereich der nicht dargestellten Kraftstoffhochdruckpumpe in hydraulischer Wirkverbindung.In the valve housing 15 a plurality of radially directed control openings 31 are arranged. The control openings 31 are in hydraulic operative connection with the low-pressure region of the high-pressure fuel pump, not shown.
Die Strömungsrichtung von der Öffnung 29 durch denThe flow direction from the opening 29 through the
Ventilkolben 21 und die Steueröffnungen 31 kann auch umgekehrt werden. In diesem Fall wären dann die Steueröffnungen 31 mit der Druckseite der Vorförderpumpe verbunden, während die Öffnung 29 mit dem Niederdruckbereich der Hochdruckpumpe hydraulisch verbunden wäre .Valve piston 21 and the control openings 31 can also be reversed. In this case, the control openings 31 would then be connected to the pressure side of the prefeed pump, while the opening 29 would be hydraulically connected to the low-pressure region of the high-pressure pump.
Die obere Hälfte der Figur 1 zeigt das Regelventil 11 in der Öffnungsstellung, in der die Steueröffnung 31 vollständig durch den Ventilkolben 21 freigegeben ist. In der unteren Hälfte der Figur 1 ist das Regelventil 3 in seiner Schließstellung dargestellt. Hierbei wirkt die Magnetkraft des bestromten Elektromagneten 1 über den Anker 7 und den Ankerbolzen 9 auf den Ventilkolben 21 und bewegt diesen gegen die Druckfeder 23 in die besagte Schließsteilung.The upper half of Figure 1 shows the control valve 11 in the open position, in which the control port 31 is completely released by the valve piston 21. In the lower half of Figure 1, the control valve 3 is shown in its closed position. Here, the magnetic force of the energized electromagnet 1 via the armature 7 and the anchor bolt 9 acts on the valve piston 21 and moves this against the compression spring 23 in said closing division.
Umgekehrt vermag die Druckfeder 23 den Ventilkolben 21 in die Öffnungsstellung zu verschieben, sobald die Bestromung des Elektromagneten 1 und damit dessen auf den Anker 7 und den Ankerbolzen 9 wirkende Magnetkraft entsprechend verringert wird.Conversely, the compression spring 23 can move the valve piston 21 in the open position as soon as the energization of the electromagnet 1 and thus its acting on the armature 7 and the anchor bolt 9 magnetic force is reduced accordingly.
In der Öffnungsstellung des Regelventils 3 strömt der dem Regelventil bei der Öffnung 29 zugeführte Kraftstoff zur Saugseite der Kraftstoffhochdruckpumpe (nicht dargestellt) .In the open position of the control valve 3 of the control valve at the opening 29 supplied fuel flows to the suction side of the high-pressure fuel pump (not shown).
Im Boden 25 des Ventilkolbens 21 ist eine Ausgleichsbohrung 33 vorgesehen. Auch im Anker 7 sind Ausgleichsbohrungen 35 vorgesehen.In the bottom 25 of the valve piston 21, a compensation bore 33 is provided. Also in the anchor 7 compensating holes 35 are provided.
Bei dem in Figur 1 dargestellten ersten Ausführungsbeispiel ragt der Ankerbolzen 9 über den Anker 7 in den Magnettopf 11 hinaus.In the first exemplary embodiment shown in FIG. 1, the anchor bolt 9 projects beyond the armature 7 into the magnet pot 11.
In dem Bereich zwischen dem Anker 7 und dem Ventilkolben 21 ist im Ventilgehäuse 15 eine erste Lagerbuchse 37 eingepresst. Die erste Lagerbuchse 37 dient dazu, den Ankerbolzen 9 und mit ihm den Anker 7 in axialer Richtung zu führen. Da der Ankerbolzen 9 aus einem verschleißfesten Material, wie beispielsweise gehärtetem Stahl, hergestellt werden kann, ist die Lagerung der beweglichen Teile des Elektromagneten 1 mit Hilfe der ersten Lagerbuchse 37 sehr langlebig und nahezu verschleißfrei. Wegen des naturgemäß kleinen Durchmessers des Ankerbolzens 9 im Vergleich zu dem Außendurchmessers des Ankers 7 ist auch die Reibung zwischen der ersten Lagerbuchse 37 und dem Ankerbolzen 9 sehr gering. Um eine weitere Verbesserung der Führung des Ankerbolzens 9 und mit ihm des Ankers 7 zu erreichen, ist auf der dem Ventilkolben 21 abgewandten Ende des Ankerbolzens 9 eine zweite Lagerbuchse 39 in den Magnettopf 11 eingepresst. Dadurch wird das Verkippen des Ankerbolzens 9 unterbunden. Durch die beidseitige Führung des Ankerbolzens 9 ist auch gewährleistet, dass der Anker 7 nicht in radialer Richtung ausweichen kann, wenn beispielsweise die von der Magnetspule 5 auf den Anker 7 ausgeübten magnetischen Kräfte eine radiale Komponenten haben. Wegen der präzisen und verschleißarmen Führung des Ankerbolzens 9 in den Lagerbuchsen 37 und 39 ist auch gewährleistet, dass der Anker 7 nicht in Kontakt mit dem Magnettopf 11 gelangt und somit auch dort weder Reibung noch Verschleiß auftreten können.In the area between the armature 7 and the valve piston 21, a first bearing bush 37 is pressed in the valve housing 15. The first bearing bush 37 serves to guide the anchor bolt 9 and with it the armature 7 in the axial direction. Since the anchor bolt 9 can be made of a wear-resistant material, such as hardened steel, the bearing of the moving parts of the electromagnet 1 by means of the first bearing bush 37 is very durable and virtually wear-free. Because of the naturally small diameter of the anchor bolt 9 in comparison to the outer diameter of the armature 7 and the friction between the first bearing bush 37 and the anchor bolt 9 is very low. In order to achieve a further improvement in the guidance of the anchor bolt 9 and with it the armature 7, a second bearing bush 39 is pressed into the magnet pot 11 on the end of the anchor bolt 9 facing away from the valve piston 21. As a result, the tilting of the anchor bolt 9 is prevented. The two-sided guidance of the anchor bolt 9 also ensures that the armature 7 can not escape in the radial direction, if, for example, the magnetic forces exerted by the magnetic coil 5 on the armature 7 have a radial component. Because of the precise and low-wear guidance of the anchor bolt 9 in the bearing bushes 37 and 39 is also ensured that the armature 7 does not come into contact with the magnet pot 11 and thus there neither friction nor wear can occur.
In Figur 2 ist ein zweites Ausführungsbeispiel einer erfindungsgemäßen Kraftstoffzumesseinheit dargestellt, bei dem die Baulänge gegenüber dem ersten Ausführungsbeispiel etwas verkürzt ist und gleichzeitig eine präzise und verschleißarme Führung des Ankerbolzens 9 und mit ihm des Ankers 7 erreicht wird. Bei diesem zweiten Ausführungsbeispiel sind sowohl die erste Lagerbuchse 37 als auch die zweite Lagerbuchse 39 in dem Bereich zwischen dem Anker 7 und dem Ventilkolben 21 angeordnet. Beide2 shows a second embodiment of a fuel metering unit according to the invention is shown in which the overall length compared to the first embodiment is somewhat shortened and at the same time a precise and low-wear guidance of the anchor bolt 9 and with it the armature 7 is achieved. In this second exemplary embodiment, both the first bearing bush 37 and the second bearing bush 39 are arranged in the region between the armature 7 and the valve piston 21. Both
Lagerbuchse 37 und 39 sind in dem Magnettopf 11 eingepresst und sind voneinander in axialer Richtung des Ankerbolzens 9 beabstandet. Dadurch wird ein Verkippen des Ankerbolzens 9 und damit auch ein Schleifen oder ein Kontakt zwischen dem Anker 7 und dem Magnettopf 11 wirksam verhindert. ImBearing bush 37 and 39 are pressed into the magnet pot 11 and are spaced from each other in the axial direction of the anchor bolt 9. As a result, a tilting of the anchor bolt 9 and thus also a grinding or contact between the armature 7 and the magnet pot 11 is effectively prevented. in the
Ergebnis weist auch dieses zweite Ausführungsbeispiel die gleichen Vorteile des ersten Ausführungsbeispiels auf. As a result, this second embodiment also has the same advantages of the first embodiment.

Claims

R . 31114713.05.2005 THE/GGARobert Bosch GmbH, 70442 StuttgartAnsprüche R. 31114713.05.2005 THE / GGARobert Bosch GmbH, 70442 Stuttgart claims
1. Kraftstoffzumesseinheit zur saugseitigen Fördermengenregelung der Kraftstoffhochdruckpumpe einer Brennkraftmaschine, wobei die Kraftstoffzumesseinheit ein von einem Elektromagnet (1) betätigtes Regelventil (3) mit einem Ventilkolben (21) aufweist, wobei der Elektromagnet (1) einen Anker (7) und einen Ankerbolzen (9) und eine Lagerbuchse umfasst, dadurch gekennzeichnet, dass eine erste Lagerbuchse (37) zwischen dem Anker (7) und dem Ventilkolben (21) angeordnet ist, und dass die erste1. A fuel metering unit for suction-side flow rate control of the high-pressure fuel pump of an internal combustion engine, the fuel metering unit having a solenoid (1) actuated control valve (3) with a valve piston (21), wherein the electromagnet (1) has an armature (7) and an anchor bolt (9 ) and a bearing bush, characterized in that a first bearing bush (37) between the armature (7) and the valve piston (21) is arranged, and that the first
Lagerbuchse (37) den Ankerbolzen (9) axial verschiebbar führt.Bushing (37) the anchor bolt (9) axially displaceable leads.
2. Kraftstoffzumesseinheit nach Anspruch 1, dadurch gekennzeichnet, dass eine zweite Lagerbuchse (39) zwischen dem Anker (7) und dem Ventilkolben (21) angeordnet ist, und dass die zweite Lagerbuchse (39) den Ankerbolzen (9) axial verschiebbar führt.2. fuel metering unit according to claim 1, characterized in that a second bearing bush (39) between the armature (7) and the valve piston (21) is arranged, and that the second bearing bush (39), the armature pin (9) axially displaceable.
3. Kraftstoffzumesseinheit nach Anspruch 1, dadurch gekennzeichnet, dass eine zweite Lagerbuchse (39) an dem dem Ventilkolben (21) abgewandten Ende des Ankerbolzens (9) angeordnet ist, und dass die zweite Lagerbuchse (39) den Ankerbolzen (9) axial verschiebbar führt. 3. fuel metering unit according to claim 1, characterized in that a second bearing bush (39) on the valve piston (21) facing away from the end of the anchor bolt (9) is arranged, and that the second bearing bush (39), the anchor bolt (9) axially displaceable ,
4. Kraftstoffzumesseinheit nach Anspruch 3, dadurch gekennzeichnet, dass der Ankerbolzen (9) über den Anker (7) hinausragt .4. fuel metering unit according to claim 3, characterized in that the anchor bolt (9) protrudes beyond the armature (7).
5. Kraftstoffzumesseinheit nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die an dem dem5. Kraftstoffzumesseinheit according to any one of the preceding claims, characterized in that the at the
Ventilkolben (21) abgewandten Ende des Ankerbolzens (9) angeordnete zweite Lagerbuchse (39) in einem Magnettopf (11) befestigt ist.Valve piston (21) facing away from the end of the anchor bolt (9) arranged second bearing bush (39) in a magnet pot (11) is fixed.
6. Kraftstoffzumesseinheit nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die zwischen Anker6. fuel metering unit according to one of the preceding claims, characterized in that the between anchor
(7) und Ventilkolben (21) angeordnete Lagerbuchsen (37, 39) in einem Ventilgehäuse (15) befestigt ist.(7) and valve piston (21) arranged bearing bushes (37, 39) in a valve housing (15) is attached.
7. Kraftstoffzumesseinheit nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Elektromagnet (1) als Tauchankermagnet ausgebildet ist.7. fuel metering unit according to one of the preceding claims, characterized in that the electromagnet (1) is designed as a solenoid plunger.
8. Kraftstoffzumesseinheit nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Lagerbuchsen8. fuel metering unit according to one of the preceding claims, characterized in that the bearing bushes
(37, 39) aus Bronze hergestellt werden.(37, 39) are made of bronze.
9. Kraftstoffzumesseinheit nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Lagerbuchsen9. fuel metering unit according to one of the preceding claims, characterized in that the bearing bushes
(37, 39) aus Kunststoff, insbesondere kraftstoffbeständigem und/oder temperaturbeständigem Kunststoff, bestehen.(37, 39) made of plastic, in particular fuel-resistant and / or temperature-resistant plastic, exist.
10. Kraftstoffzumesseinheit nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Ventilkolben (21) in dem Ventilgehäuse (15) geführt ist.10. Kraftstoffzumesseinheit according to any one of the preceding claims, characterized in that the valve piston (21) in the valve housing (15) is guided.
11. Kraftstoffzumesseinheit nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Ventilkolben11. Kraftstoffzumesseinheit according to any one of the preceding claims, characterized in that the valve piston
(21) hülsenförmig ausgebildet ist und in seinem Innenraum eine Druckfeder (23) aufnimmt, und dass die Druckfeder (23) sich einenends mindestens mittelbar am Ventilgehäuse (15) abstützt . (21) is sleeve-shaped and receives in its interior a compression spring (23), and that the compression spring (23) at one end at least indirectly on the valve housing (15) is supported.
12. Kraftstoffzumesseinheit nach Anspruch 11, dadurch gekennzeichnet, dass im Ventilgehäuse (15) ein Federteller (27) vorgesehen ist, und dass die Druckfeder (23) sich einenends gegen den Federteller (27) abstützt.12. fuel metering unit according to claim 11, characterized in that in the valve housing (15) has a spring plate (27) is provided, and that the compression spring (23) at one end against the spring plate (27) is supported.
13. Kraftstoffhochdruckpumpe für ein13. High-pressure fuel pump for one
Kraftstoffeinspritzsystem mit mindestens einem Pumpenelement und mit einer Kraftstoffzumesseinheit zur Fördermengenregelung, dadurch gekennzeichnet, dass die Kraftstoffzumesseinheit nach einem der vorhergehenden Ansprüche ausgeführt ist. Fuel injection system with at least one pump element and with a fuel metering unit for flow control, characterized in that the fuel metering unit is designed according to one of the preceding claims.
EP06725632A 2005-06-06 2006-04-07 Fuel metering unit for a high-pressure fuel pump and associated high-pressure fuel pump Not-in-force EP1891323B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005025872A DE102005025872A1 (en) 2005-06-06 2005-06-06 Fuel metering unit for a high-pressure fuel pump and high-pressure fuel pump
PCT/EP2006/061419 WO2006131408A1 (en) 2005-06-06 2006-04-07 Fuel metering unit for a high-pressure fuel pump and associated high-pressure fuel pump

Publications (2)

Publication Number Publication Date
EP1891323A1 true EP1891323A1 (en) 2008-02-27
EP1891323B1 EP1891323B1 (en) 2009-11-11

Family

ID=36406536

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06725632A Not-in-force EP1891323B1 (en) 2005-06-06 2006-04-07 Fuel metering unit for a high-pressure fuel pump and associated high-pressure fuel pump

Country Status (6)

Country Link
US (1) US20080271708A1 (en)
EP (1) EP1891323B1 (en)
JP (1) JP2008545917A (en)
AT (1) ATE448403T1 (en)
DE (2) DE102005025872A1 (en)
WO (1) WO2006131408A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007059855A1 (en) * 2007-12-12 2009-06-25 Robert Bosch Gmbh Fuel metering unit for a high-pressure fuel pump and high-pressure fuel pump
DE102008043798A1 (en) 2008-11-17 2010-05-20 Robert Bosch Gmbh Fuel metering unit for a fuel pump
DE102009028501A1 (en) * 2009-08-13 2011-02-17 Robert Bosch Gmbh Fuel metering device for a fuel injection system
JP6245238B2 (en) 2015-09-11 2017-12-13 トヨタ自動車株式会社 Fuel pump
JP6217725B2 (en) 2015-10-06 2017-10-25 トヨタ自動車株式会社 Fuel pump
CN106224621A (en) * 2016-09-09 2016-12-14 广东意希诺科技有限公司 Split type fuel metering valve

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002004977A (en) * 2000-06-26 2002-01-09 Denso Corp Flow control device
US6669166B2 (en) * 2000-07-28 2003-12-30 Nippon Soken, Inc. Electromagnetic valve
JP2003120845A (en) * 2001-10-12 2003-04-23 Denso Corp Metering valve device and fuel injection pump using the same
US6824120B2 (en) * 2001-11-09 2004-11-30 Denso Corporation Flow amount control device
JP2005299683A (en) * 2001-11-27 2005-10-27 Bosch Corp Liquid flow control valve and needle anchor
DE10242219A1 (en) * 2002-09-12 2004-03-25 Robert Bosch Gmbh Fuel metering unit for injection system has valve with flat characteristic for idling/low load, steep characteristic for partial/full load; transition between characteristics can be differentiated

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2006131408A1 *

Also Published As

Publication number Publication date
WO2006131408A1 (en) 2006-12-14
EP1891323B1 (en) 2009-11-11
DE502006005349D1 (en) 2009-12-24
DE102005025872A1 (en) 2006-12-07
ATE448403T1 (en) 2009-11-15
US20080271708A1 (en) 2008-11-06
JP2008545917A (en) 2008-12-18

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