EP2187037A1 - Fuel measuring unit for a fuel pump - Google Patents

Fuel measuring unit for a fuel pump Download PDF

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Publication number
EP2187037A1
EP2187037A1 EP09173591A EP09173591A EP2187037A1 EP 2187037 A1 EP2187037 A1 EP 2187037A1 EP 09173591 A EP09173591 A EP 09173591A EP 09173591 A EP09173591 A EP 09173591A EP 2187037 A1 EP2187037 A1 EP 2187037A1
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EP
European Patent Office
Prior art keywords
metering unit
bearing bush
fuel metering
fuel
anchor bolt
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
EP09173591A
Other languages
German (de)
French (fr)
Other versions
EP2187037B1 (en
Inventor
Steffen Wieland
Marion Schieber-Stitz
Tobias Landenberger
Tilman Miehle
Jochen Wessner
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Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Publication date
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Publication of EP2187037A1 publication Critical patent/EP2187037A1/en
Application granted granted Critical
Publication of EP2187037B1 publication Critical patent/EP2187037B1/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
    • 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
    • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
    • 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
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46—Valves
    • F02M59/466—Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/004—Sliding valves, e.g. spool valves, i.e. whereby the closing member has a sliding movement along a seat for opening and closing

Definitions

  • the invention relates to a fuel metering unit for a fuel pump in an internal combustion engine according to the preamble of claim 1. Furthermore, the subject of the invention is a fuel pump according to the preamble of the corresponding independent patent claim.
  • Such a fuel metering unit is characterized by the DE 10 2005 025 872 A1 known.
  • This fuel metering unit is used for suction side flow control of a fuel pump, which is part of a fuel injection device of an internal combustion engine.
  • the fuel metering unit has a control valve actuated by an electromagnet with a valve member, by means of which different flow cross sections can be set in the intake region of the high-pressure fuel pump. This regulates the flow rate of the fuel pump.
  • the electromagnet has an armature and a movable anchor bolt, through which the valve member is movable.
  • the anchor bolt is guided axially displaceably in at least one bearing bush.
  • This at least one bearing bush can be made of metal, for example. Of bronze, aluminum or copper or of a fuel and temperature-resistant plastic.
  • the object of the invention is to develop a fuel metering unit of the type mentioned in such a way that it has a better performance and an increased life.
  • the fuel metering unit should also be inexpensive.
  • pressure equalizing bores are, for example, provided in a bottom of a valve piston and / or in the armature of the fuel metering unit. According to the invention, these pressure compensation holes are at least partially integrated into the bearing bushes necessary for guiding the anchor bolt, in any case, by having an axial groove.
  • These bushings are preferably manufactured separately with high accuracy from an extruded profile to realize on the one hand a tight fit of the bearing bush in a valve housing and on the other hand, the best possible guidance for the anchor bolt.
  • one or more axial grooves can be provided on the bearing bush without additional production costs.
  • pressure compensation holes within the valve housing can thus be omitted at least partially. This makes the device according to the invention inexpensive.
  • the axial grooves can be arranged on an outer side or on an inner side of the bearing bush.
  • a single axial groove per bushing may be sufficient.
  • an additional advantage results when the axial grooves are dimensioned so that the contact surface between a bearing surface and the anchor bolt minimized and as a result, the frictional resistance is reduced. This also makes it possible to keep the inner bore of the bearing bush over the entire length constant.
  • the inside of the bearing bush is designed only partially cylindrical and this thus only partially acts as a bearing surface for the anchor bolt.
  • the inner diameter of the bearing bush is larger in regions than the inner diameter in the region of the bearing surface.
  • the area with the larger one Diameter can be arranged only on one side of the bearing bush. But it can also be arranged on both sides of the bearing bush, so that the actual bearing surface for the anchor bolt is located in the middle of the bearing bush.
  • the region of the bearing bush with a larger inner diameter can, for example, be conical or simply cylindrical with a larger diameter.
  • the bearing bush is made by forming material, in particular drawing or extrusion.
  • material in particular drawing or extrusion.
  • extrusion for example, is the ability to produce profiles with great precision, even in the most complicated shapes or in difficult-to-form materials.
  • the choice of the usable material is almost arbitrary.
  • the high degree of deformation achievable in one process step and the relatively low tool costs make the production process effective and cost-effective.
  • the bushing can also be made by drawing round stock by a die, which is also effective and inexpensive.
  • FIG. 1 a fuel metering unit according to the invention is shown in a longitudinal section. It is indicated in its entirety by the reference numeral 1.
  • the fuel metering unit 1 is disposed in the fuel flow between a prefeed pump and a high-pressure fuel pump of a fuel injector for an internal combustion engine, and serves to variably adjust the amount of fuel delivered by the high-pressure fuel pump.
  • a variable flow cross-section is set between the prefeed pump and the high-pressure fuel pump.
  • the fuel metering unit 1 is driven by an electronic control device (not shown) through which Operating parameters of the internal combustion engine are evaluated and depending on a required flow rate of the high-pressure fuel pump is determined.
  • the fuel metering unit 1 has an electromagnet 10 and a control valve 12 operated by it.
  • the essential components of the electromagnet 10 are a magnetic coil 14, an armature 16 with anchor bolt 18 and a magnet pot 20 which surrounds the magnetic coil 14 and the armature 16 partially.
  • Anchor bolt 18 and solenoid 14 may be made in one piece or as separate components.
  • the magnetic pot 20 is partially encapsulated in plastic, wherein on the encapsulation 21, a plug housing 22 is formed in which at least one electrical connection 24 is arranged for the magnetic coil 14.
  • the control valve 12 has a valve housing 30, which also serves as a magnetic core.
  • a longitudinal bore 32 is provided, in which a piston-shaped valve member 34 of the control valve 12 is guided displaceably.
  • the valve member 34 is cup-shaped and hollow, at the bottom 36 of the anchor bolt 18 abuts.
  • the valve member 34 is held by an arranged in this prestressed spring 38 in contact with the anchor bolt 18.
  • the spring 38 is supported on the one hand on the inside of the bottom 36 of the valve member 34 and on the other hand on an annular securing element 39 inserted into the longitudinal bore 32.
  • In the bottom 36 of the valve member 34 at least one, preferably a plurality of openings 37 are provided through which during the axial movement of the valve member 34 in the longitudinal bore 32 fuel can flow. Through the openings 37 is a pressure compensation (in FIG. 1 ) in the lower portion of the fuel metering unit 1 on both sides of the valve member 34 in the longitudinal bore 32 allows.
  • At least one, preferably a plurality of openings 40 are provided on the circumference of the valve housing 30 and are connected to a fuel inlet from the prefeed pump.
  • the openings 40 can open on the circumference of the longitudinal bore 32 in the valve housing 30 in a circumferential annular groove 42.
  • an annular filter 44 can be arranged in the region of the openings 40, by which it is prevented that contaminants can enter the control valve 12. The fuel flow from the control valve 12 to the high-pressure fuel pump out from the interior of the valve member 34 through the open, the electromagnet 10 side facing away from the valve housing 30 from the longitudinal bore 32 out.
  • the valve member 34 has in its periphery near its open end at least one, preferably a plurality of control openings 46, through which the size of the flow cross-section between the inlet and outlet of the control valve 12 is controlled during the axial movement of the valve member 34 in the longitudinal bore 32.
  • FIG. 1 the valve member 34 is shown in the left half in its fully open position and in the right half in its closed position. Between the armature 16 and the valve housing 30, a residual air gap disk 31 is arranged, by which it is prevented that the armature 16 comes to rest on the valve housing 30.
  • the anchor bolt 18 projects from the magnet pot 20 through an opening 50 in the valve housing 30 into the longitudinal bore 32.
  • the opening 50 can form a bearing point for the anchor bolt 18, in which it is guided in the direction of its longitudinal axis 19 slidably.
  • the anchor bolt 18 is displaceably guided in a bearing bush 52 in the direction of its longitudinal axis 19.
  • the bushing 52 is inserted into a hollow cylindrical receptacle 53 of the magnet pot 20, preferably pressed.
  • the fuel metering unit 1 has a cavity 54.
  • the bushing 52 is designed as a solid undivided component made of metal or a suitable plastic having a cylindrical outer shape and has an outer diameter D, on which the bearing bush 52 is pressed into the receptacle 53.
  • the bearing bush 52 On the inside, the bearing bush 52 has a cylindrical bearing surface 55 with a diameter d, in which the anchor bolt 18 is guided with little radial play.
  • the bushing 52 is made by forming, in particular drawing or extrusion.
  • the bearing surface 55 of the bushing 52 may be provided with a lubricious coating or a slid surface to improve the sliding properties and to achieve high wear resistance.
  • a groove 56 is arranged in the upper region of the plan view, which extends axially over the entire length of the bearing bush 52.
  • the axial groove 56 forms after pressing the bearing bush 52 into the receptacle 53 a cavity which serves for pressure equalization in the cavity 54 when moving the anchor bolt 18.
  • a plurality of axial grooves may also be arranged on the outer side (cf., reference numeral 56a) and / or on the inner side, that is, the bearing surface 55 (see reference numeral 56b). It should be noted that the axial grooves are evenly distributed over the circumference of the bearing bush to ensure accurate guidance of the anchor bolt 18.
  • a particularly economical embodiment of the bearing shell according to the invention provides that the axial grooves 56b are dimensioned so that the contact surface between the bearing surface 55 and anchor bolt 18 minimized and as a result, the frictional resistance is reduced. As a result, it is also possible to keep the inner bore 55 of the bearing bush 52 constant over the entire length and finish it during the forming process.
  • the inner diameter d and the outer diameter D and thus the wall thickness of the bearing bush 52 can be selected substantially arbitrarily. With the bearing bush 52 thus relatively large differences in diameter between the anchor bolt 18 and the recording of the bearing bush 52 in the magnet pot 20 can be compensated. This facilitates the production of the magnetic pot 20, since this must have a relatively large diameter in the region of the armature 16 and the adjoining receptacle for the bearing bush 52 in diameter only has to be made slightly smaller, since the difference in diameter to the anchor bolt 18 through the bearing bush 52 is compensated.

Abstract

The unit has a regulating valve that is actuated by an electromagnet, where the electromagnet moves an anchor bolt by magnetic force. The anchor bolt is mounted on a bearing bush (52) in an axially adjustable manner, where an axial groove (56) is provided in the bearing bush. The axial groove is arranged at an outer side or an inner side of the bearing bush. An inner side of the bearing bush is cylindrically arranged in regions and works as a bearing surface (55) for the anchor bolt in the regions.

Description

Stand der TechnikState of the art

Die Erfindung betrifft eine Kraftstoffzumesseinheit für eine Kraftstoffpumpe in einer Brennkraftmaschine nach dem Oberbegriff des Anspruchs 1. Außerdem ist Gegenstand der Erfindung eine Kraftstoffpumpe nach dem Oberbegriff des entsprechenden nebengeordneten Patentanspruchs.The invention relates to a fuel metering unit for a fuel pump in an internal combustion engine according to the preamble of claim 1. Furthermore, the subject of the invention is a fuel pump according to the preamble of the corresponding independent patent claim.

Eine solche Kraftstoffzumesseinheit ist durch die DE 10 2005 025 872 A1 bekannt. Diese Kraftstoffzumesseinheit dient zur saugseitigen Fördermengenregelung einer Kraftstoffpumpe, die Teil einer Kraftstoffeinspritzeinrichtung einer Brennkraftmaschine ist. Die Kraftstoffzumesseinheit weist ein von einem Elektromagneten betätigtes Regelventil mit einem Ventilglied auf, durch das im Ansaugbereich der Kraftstoffhochdruckpumpe unterschiedliche Durchflussquerschnitte eingestellt werden können. Dadurch wird Fördermenge der Kraftstoffpumpe geregelt. Der Elektromagnet weist einen Anker und einen beweglichen Ankerbolzen auf, durch den das Ventilglied bewegbar ist. Der Ankerbolzen ist in wenigstens einer Lagerbuchse axial verschiebbar geführt. Diese wenigstens eine Lagerbuchse kann aus Metall, bspw. aus Bronze, Aluminium oder Kupfer oder aus einem kraftstoff- und temperaturbeständigem Kunststoff hergestellt sein.Such a fuel metering unit is characterized by the DE 10 2005 025 872 A1 known. This fuel metering unit is used for suction side flow control of a fuel pump, which is part of a fuel injection device of an internal combustion engine. The fuel metering unit has a control valve actuated by an electromagnet with a valve member, by means of which different flow cross sections can be set in the intake region of the high-pressure fuel pump. This regulates the flow rate of the fuel pump. The electromagnet has an armature and a movable anchor bolt, through which the valve member is movable. The anchor bolt is guided axially displaceably in at least one bearing bush. This at least one bearing bush can be made of metal, for example. Of bronze, aluminum or copper or of a fuel and temperature-resistant plastic.

Offenbarung der ErfindungDisclosure of the invention

Aufgabe der Erfindung ist es, eine Kraftstoffzumesseinheit der eingangs genannten Art derart weiterzuentwickeln, dass sie ein besseres Betriebsverhalten und eine erhöhte Lebensdauer aufweist. Die Kraftstoffzumesseinheit soll zudem kostengünstig sein.The object of the invention is to develop a fuel metering unit of the type mentioned in such a way that it has a better performance and an increased life. The fuel metering unit should also be inexpensive.

Die Aufgabe wird durch eine Kraftstoffzumesseinheit mit den Merkmalen des Anspruch 1 gelöst, sowie durch eine Kraftstoff-Hochdruckpumpe mit den Merkmalen des nebengeordneten Patentanspruchs. Für die Erfindung wichtige Merkmale finden sich ferner in der nachfolgenden Beschreibung und in der Zeichnung, wobei die Merkmale sowohl in Alleinstellung als auch in unterschiedlichen Kombinationen für die Erfindung wichtig sein können, ohne dass hierauf jeweils explizit hingewiesen wird. Vorteilhafte Weiterbildungen finden sich in den Unteransprüchen.The object is achieved by a fuel metering unit with the features of claim 1, as well as by a high-pressure fuel pump with the features of the independent patent claim. Features important to the invention are further found in the following description and in the drawing, wherein the features both alone and in different combinations for the invention may be important, without being explicitly noted. Advantageous developments can be found in the subclaims.

Beim Betreiben der Kraftstoffzumesseinheit wird insbesondere durch das Bewegen des Ankerbolzens zwangsläufig Kraftstoff im Inneren der Kraftstoffzumesseinheit verschoben. .Damit die Funktion der Kraftstoffzumesseinheit dadurch nicht behindert wird und um betriebsbedingte, nachteilige Veränderungen in der Kraftstoffzumesseinheit zu verhindern, sind bekanntermaßen Druckausgleichsbohrungen bspw. in einem Boden eines Ventilkolbens und/oder im Anker der Kraftstoffzumesseinheit vorgesehen. Erfindungsgemäß werden diese Druckausgleichsbohrungen zumindest teilweise in die ohnehin notwendigen Lagerbuchsen zur Führung des Ankerbolzens integriert, indem sie eine Axialnut aufweisen. Diese Lagerbuchsen werden mit hoher Genauigkeit separat bevorzugt aus einen Strangpressprofil hergestellt, um einerseits eines festen Sitzes der Lagerbuchse in einem Ventilgehäuse und andererseits eine bestmögliche Führung für den Ankerbolzen zu realisieren. Schon während des beim Strangpressen erfolgenden Umformvorgangs können ohne zusätzliche Herstellungskosten eine oder mehrere Axialnuten an der Lagerbuchse vorgesehen werden. Auf Druckausgleichsbohrungen innerhalb des Ventilgehäuses kann somit zumindest teilweise verzichtet werden. Dies macht die erfindungsgemäße Vorrichtung kostengünstig.In operation of the fuel metering unit, fuel is displaced inside the fuel metering unit, in particular, by the movement of the anchor bolt. In order not to obstruct the function of the fuel metering unit and to prevent operationally adverse changes in the fuel metering unit, pressure equalizing bores are, for example, provided in a bottom of a valve piston and / or in the armature of the fuel metering unit. According to the invention, these pressure compensation holes are at least partially integrated into the bearing bushes necessary for guiding the anchor bolt, in any case, by having an axial groove. These bushings are preferably manufactured separately with high accuracy from an extruded profile to realize on the one hand a tight fit of the bearing bush in a valve housing and on the other hand, the best possible guidance for the anchor bolt. Already during the forming process taking place during extrusion, one or more axial grooves can be provided on the bearing bush without additional production costs. On pressure compensation holes within the valve housing can thus be omitted at least partially. This makes the device according to the invention inexpensive.

Unter Berücksichtigung eines Gesamtkonzeptes der Kraftstoffzumesseinheit können die Axialnuten dabei an einer Außenseite oder an einer Innenseite der Lagerbuchse angeordnet sein. Eine einzige Axialnut pro Lagerbuchse kann ausreichend sein. Bei einer Verwendung von mehreren Axialnuten ist es in aller Regel vorteilhaft, die Axialnuten gleichmäßig über den Umfang zu verteilen, um eine genaue Führung des Ankerbolzens zu gewährleisten. Bei der Anordnung der Axialnuten an der Innenseite der Lagerbuchsen ergibt sich ein zusätzlicher Vorteil, wenn die Axialnuten so dimensioniert werden, dass die Kontaktfläche zwischen einer Lagerfläche und dem Ankerbolzen minimiert und in Folge dessen der Reibungswiderstand verringert wird. Dadurch ist es auch möglich, die Innenbohrung der Lagerbuchse über die ganze Länge konstant zu halten.Taking into account an overall concept of the fuel metering unit, the axial grooves can be arranged on an outer side or on an inner side of the bearing bush. A single axial groove per bushing may be sufficient. When using a plurality of axial grooves, it is generally advantageous to distribute the axial grooves uniformly over the circumference in order to ensure accurate guidance of the anchor bolt. In the arrangement of the axial grooves on the inside of the bushings, an additional advantage results when the axial grooves are dimensioned so that the contact surface between a bearing surface and the anchor bolt minimized and as a result, the frictional resistance is reduced. This also makes it possible to keep the inner bore of the bearing bush over the entire length constant.

Um den Reibungswiderstand des Ankerbolzens zu reduzieren, ist es weiter möglich, dass die Innenseite der Lagerbuchse lediglich bereichsweise zylindrisch ausgeführt ist und diese damit nur bereichsweise als Lagerfläche für den Ankerbolzen wirkt. Das bedeutet im Umkehrschluss, dass der Innendurchmesser der Lagerbuchse bereichsweise größer ist als der Innendurchmesser im Bereich der Lagerfläche. Der Bereich mit dem größeren Durchmesser kann dabei nur auf einer Seite der Lagerbuchse angeordnet sein. Er kann aber auch auf beiden Seiten der -Lagerbuchse angeordnet sein, so dass sich die eigentliche Lagerfläche für den Ankerbolzen in der Mitte der Lagerbuchse befindet. Dabei kann der Bereich der Lagerbuchse mit einem größeren Innendurchmesser bereichsweise bspw. konisch oder einfach mit einem größeren Durchmesser zylindrisch ausgestaltet sein.In order to reduce the frictional resistance of the anchor bolt, it is further possible that the inside of the bearing bush is designed only partially cylindrical and this thus only partially acts as a bearing surface for the anchor bolt. This means, conversely, that the inner diameter of the bearing bush is larger in regions than the inner diameter in the region of the bearing surface. The area with the larger one Diameter can be arranged only on one side of the bearing bush. But it can also be arranged on both sides of the bearing bush, so that the actual bearing surface for the anchor bolt is located in the middle of the bearing bush. In this case, the region of the bearing bush with a larger inner diameter can, for example, be conical or simply cylindrical with a larger diameter.

Vorteilhaft ist auch, dass die Lagerbuchse durch Umformen von Material, insbesondere Ziehen oder Strangpressen, hergestellt ist. Der Vorteil des Strangpressens ist beispielsweise die Möglichkeit, Profile auch in kompliziertesten Formen oder aus schwer umformbaren Werkstoffen mit großer Präzision herzustellen. Dadurch ist die Wahl des verwendbaren Werkstoffs nahezu beliebig. Der hohe, in einem Verfahrensschritt erreichbare Umformgrad und die relativ geringen Werkzeugkosten machen das Herstellungsverfahren effektiv und kostengünstig. Alternativ kann die Lagerbuchse auch durch Ziehen von Rundmaterial durch einen Ziehstein hergestellt werden, was ebenfalls effektiv und kostengünstig ist.It is also advantageous that the bearing bush is made by forming material, in particular drawing or extrusion. The advantage of extrusion, for example, is the ability to produce profiles with great precision, even in the most complicated shapes or in difficult-to-form materials. As a result, the choice of the usable material is almost arbitrary. The high degree of deformation achievable in one process step and the relatively low tool costs make the production process effective and cost-effective. Alternatively, the bushing can also be made by drawing round stock by a die, which is also effective and inexpensive.

Kurzbeschreibung der FigurenBrief description of the figures

Nachfolgend wird anhand der Figuren ein Ausführungsbeispiel der Erfindung beispielhaft erläutert. Es zeigen:

Figur 1
eine erfindungsgemäße Kraftstoffzumesseinheit in einem Längsschnitt; und
Figur 2
eine vergrößerte Schnittdarstellung und eine Draufsicht der Lagerbuchse aus Figur 1.
An embodiment of the invention will be explained by way of example with reference to FIGS. Show it:
FIG. 1
a fuel metering unit according to the invention in a longitudinal section; and
FIG. 2
an enlarged sectional view and a plan view of the bearing bush FIG. 1 ,

Detaillierte Beschreibung des AusführungsbeispielsDetailed description of the embodiment

In Figur 1 ist eine erfindungsgemäße Kraftstoffzumesseinheit in einem Längsschnitt dargestellt. Sie ist in ihrer Gesamtheit mit dem Bezugszeichen 1 gekennzeichnet. Die Kraftstoffzumesseinheit 1 ist in der Kraftstoffströmung zwischen einer Vorförderpumpe und einer Kraftstoffhochdruckpumpe einer Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine angeordnet und dient dazu, die von der Kraftstoffhochdruckpumpe geförderte Kraftstoffmenge variabel einzustellen. Durch die Kraftstoffzumesseinheit 1 wird dabei ein veränderlicher Durchflussquerschnitt zwischen der Vorförderpumpe und der Kraftstoffhochdruckpumpe eingestellt. Die Kraftstoffzumesseinheit 1 wird von einer elektronischen Steuereinrichtung (nicht dargestellt) angesteuert, durch die Betriebsparameter der Brennkraftmaschine ausgewertet werden und abhängig davon eine erforderliche Fördermenge der Kraftstoffhochdruckpumpe ermittelt wird.In FIG. 1 a fuel metering unit according to the invention is shown in a longitudinal section. It is indicated in its entirety by the reference numeral 1. The fuel metering unit 1 is disposed in the fuel flow between a prefeed pump and a high-pressure fuel pump of a fuel injector for an internal combustion engine, and serves to variably adjust the amount of fuel delivered by the high-pressure fuel pump. By the fuel metering unit 1, a variable flow cross-section is set between the prefeed pump and the high-pressure fuel pump. The fuel metering unit 1 is driven by an electronic control device (not shown) through which Operating parameters of the internal combustion engine are evaluated and depending on a required flow rate of the high-pressure fuel pump is determined.

Die Kraftstoffzumesseinheit 1 weist einen Elektromagneten 10 und einen durch diesen betätigtes Regelventil 12 auf. Die wesentlichen Bauteile des Elektromagneten 10 sind eine Magnetspule 14, ein Anker 16 mit Ankerbolzen 18 und ein Magnettopf 20, der die Magnetspule 14 und den Anker 16 teilweise umschließt. Ankerbolzen 18 und Magnetspule 14 können einstückig oder als gesonderte Bauteile hergestellt werden. Der Magnettopf 20 ist teilweise mit Kunststoff umspritzt, wobei an der Umspritzung 21 ein Steckergehäuse 22 ausgeformt ist, in dem wenigstens ein elektrischer Anschluss 24 für die Magnetspule 14 angeordnet ist.The fuel metering unit 1 has an electromagnet 10 and a control valve 12 operated by it. The essential components of the electromagnet 10 are a magnetic coil 14, an armature 16 with anchor bolt 18 and a magnet pot 20 which surrounds the magnetic coil 14 and the armature 16 partially. Anchor bolt 18 and solenoid 14 may be made in one piece or as separate components. The magnetic pot 20 is partially encapsulated in plastic, wherein on the encapsulation 21, a plug housing 22 is formed in which at least one electrical connection 24 is arranged for the magnetic coil 14.

Das Regelventil 12 weist ein Ventilgehäuse 30 auf, das zugleich als Magnetkern dient. Im Ventilgehäuse 30 ist eine Längsbohrung 32 vorgesehen, in der ein kolbenförmiges Ventilglied 34 des Regelventils 12 verschiebbar geführt ist. Das Ventilglied 34 ist topfförmig und hohl ausgebildet, wobei an dessen Boden 36 der Ankerbolzen 18 anliegt. Das Ventilglied 34 wird durch eine in diesem angeordnete vorgespannte Feder 38 in Anlage am Ankerbolzen 18 gehalten. Die Feder 38 stützt sich einerseits an der Innenseite des Bodens 36 des Ventilglieds 34 und andererseits an einem in die Längsbohrung 32 eingesetzten ringförmigen Sicherungselement 39 ab. Im Boden 36 des Ventilglieds 34 sind wenigstens eine, vorzugsweise mehrere Öffnungen 37 vorgesehen, durch die bei der axialen Bewegung des Ventilglieds 34 in der Längsbohrung 32 Kraftstoff hindurchströmen kann. Durch die Öffnungen 37 ist ein Druckausgleich (in Figur 1) im unteren Bereich der Kraftstoffzumesseinheit 1 auf beiden Seiten des Ventilglieds 34 in der Längsbohrung 32 ermöglicht.The control valve 12 has a valve housing 30, which also serves as a magnetic core. In the valve housing 30, a longitudinal bore 32 is provided, in which a piston-shaped valve member 34 of the control valve 12 is guided displaceably. The valve member 34 is cup-shaped and hollow, at the bottom 36 of the anchor bolt 18 abuts. The valve member 34 is held by an arranged in this prestressed spring 38 in contact with the anchor bolt 18. The spring 38 is supported on the one hand on the inside of the bottom 36 of the valve member 34 and on the other hand on an annular securing element 39 inserted into the longitudinal bore 32. In the bottom 36 of the valve member 34 at least one, preferably a plurality of openings 37 are provided through which during the axial movement of the valve member 34 in the longitudinal bore 32 fuel can flow. Through the openings 37 is a pressure compensation (in FIG. 1 ) in the lower portion of the fuel metering unit 1 on both sides of the valve member 34 in the longitudinal bore 32 allows.

Am Umfang des Ventilgehäuses 30 sind wenigstens eine, vorzugsweise mehrere Öffnungen 40, beispielsweise in Form von radialen Bohrungen, vorgesehen, die mit einem Kraftstoffzulauf von der Vorförderpumpe her verbunden sind. Die Öffnungen 40 können am Umfang der Längsbohrung 32 im Ventilgehäuse 30 in einer umlaufenden Ringnut 42 münden. Auf dem Ventilgehäuse 30 kann im Bereich der Öffnungen 40 ein ringförmiger Filter 44 angeordnet sein, durch den verhindert wird, dass Verschmutzungen in das Regelventil 12 eintreten können. Der Kraftstoffablauf aus dem Regelventil 12 zur Kraftstoffhochdruckpumpe hin erfolgt aus dem Inneren des Ventilglieds 34 durch die offene, dem Elektromagneten 10 abgewandte Seite des Ventilgehäuses 30 aus der Längsbohrung 32 heraus.At least one, preferably a plurality of openings 40, for example in the form of radial bores, are provided on the circumference of the valve housing 30 and are connected to a fuel inlet from the prefeed pump. The openings 40 can open on the circumference of the longitudinal bore 32 in the valve housing 30 in a circumferential annular groove 42. On the valve housing 30, an annular filter 44 can be arranged in the region of the openings 40, by which it is prevented that contaminants can enter the control valve 12. The fuel flow from the control valve 12 to the high-pressure fuel pump out from the interior of the valve member 34 through the open, the electromagnet 10 side facing away from the valve housing 30 from the longitudinal bore 32 out.

Das Ventilglied 34 weist in seinem Umfang nahe dessen offenem Ende wenigstens eine, vorzugsweise mehrere Steueröffnungen 46 auf, durch die bei der axialen Bewegung des Ventilglieds 34 in der Längsbohrung 32 die Größe des Durchflussquerschnitts zwischen dem Zulauf und Ablauf des Regelventils 12 gesteuert wird. Je mehr sich die Steueröffnungen 46 in Überdeckung mit der Ringnut 42 befinden, desto größer ist der Durchflussquerschnitt. In Figur 1 ist das Ventilglied 34 in der linken Hälfte in seiner voll geöffneten Stellung und in der rechten Hälfte in seiner geschlossenen Stellung dargestellt. Zwischen dem Anker 16 und dem Ventilgehäuse 30 ist ein Restluftspaltscheibe 31 angeordnet, durch die verhindert wird, dass der Anker 16 am Ventilgehäuse 30 zur Anlage kommt.The valve member 34 has in its periphery near its open end at least one, preferably a plurality of control openings 46, through which the size of the flow cross-section between the inlet and outlet of the control valve 12 is controlled during the axial movement of the valve member 34 in the longitudinal bore 32. The more the control openings 46 are in register with the annular groove 42, the larger the flow area. In FIG. 1 the valve member 34 is shown in the left half in its fully open position and in the right half in its closed position. Between the armature 16 and the valve housing 30, a residual air gap disk 31 is arranged, by which it is prevented that the armature 16 comes to rest on the valve housing 30.

Der Ankerbolzen 18 ragt vom Magnettopf 20 durch eine Öffnung 50 im Ventilgehäuse 30 hindurch in die Längsbohrung 32 hinein. Die Öffnung 50 kann dabei eine Lagerstelle für den Ankerbolzen 18 bilden, in der dieser in Richtung seiner Längsachse 19 verschiebbar geführt ist. In seinem dem Ventilgehäuse 30 abgewandten Endbereich ist der Ankerbolzen 18 in einer Lagerbuchse 52 in Richtung seiner Längsachse 19 verschiebbar geführt. Die Lagerbuchse 52 ist in eine hohlzylinderförmige Aufnahme 53 des Magnettopfs 20 eingesetzt, vorzugsweise eingepresst. In Figur 1 oberhalb der Lagerbuchse 52 weist die Kraftstoffzumesseinheit 1 einen Hohlraum 54 auf.The anchor bolt 18 projects from the magnet pot 20 through an opening 50 in the valve housing 30 into the longitudinal bore 32. The opening 50 can form a bearing point for the anchor bolt 18, in which it is guided in the direction of its longitudinal axis 19 slidably. In its end region remote from the valve housing 30, the anchor bolt 18 is displaceably guided in a bearing bush 52 in the direction of its longitudinal axis 19. The bushing 52 is inserted into a hollow cylindrical receptacle 53 of the magnet pot 20, preferably pressed. In FIG. 1 Above the bearing bush 52, the fuel metering unit 1 has a cavity 54.

Unter Bezug auf Figur 2 wird die Lagerbuchse 52 nachfolgend beschrieben. Die Lagerbuchse 52 ist als massives ungeteiltes Bauteil aus Metall oder einem geeigneten Kunststoff mit einer zylindrischen Außenform ausgeführt und weist einen Außendurchmesser D auf, an dem die Lagerbuchse 52 in die Aufnahme 53 eingepresst ist. An der Innenseite weist die Lagerbuchse 52 eine zylindrische Lagerfläche 55 mit einem Durchmesser d auf, in der der Ankerbolzen 18 mit geringem radialem Spiel geführt ist. Die Lagerbuchse 52 ist durch Umformen, insbesondere Ziehen oder Strangpressen, hergestellt. Die Lagerfläche 55 der Lagerbuchse 52 kann mit einer gleitfähigen Beschichtung oder einer gleitgeschliffenen Oberfläche versehen sein, um die Gleiteigenschaften zu verbessern und eine hohe Verschleißfestigkeit zu erreichen.With reference to FIG. 2 For example, the bushing 52 will be described below. The bushing 52 is designed as a solid undivided component made of metal or a suitable plastic having a cylindrical outer shape and has an outer diameter D, on which the bearing bush 52 is pressed into the receptacle 53. On the inside, the bearing bush 52 has a cylindrical bearing surface 55 with a diameter d, in which the anchor bolt 18 is guided with little radial play. The bushing 52 is made by forming, in particular drawing or extrusion. The bearing surface 55 of the bushing 52 may be provided with a lubricious coating or a slid surface to improve the sliding properties and to achieve high wear resistance.

In Figur 2 ist im oberen Bereich der Draufsicht eine Nut 56 angeordnet, die sich axial über die gesamte Länge der Lagerbuchse 52 erstreckt. Die Axialnut 56 bildet nach dem Einpressen der Lagerbuchse 52 in die Aufnahme 53 einen Hohlraum, der zum Druckausgleich im Hohlraum 54 beim Bewegen des Ankerbolzens 18 dient. In abweichenden Ausführungsformen können auch mehrere Axialnuten auf der Außenseite (vgl. Bezugszeichen 56a) und/oder auf der Innenseite, also der Lagerfläche 55 (vgl. Bezugszeichen 56b), angeordnet sein. Dabei ist zu berücksichtigen, dass die Axialnuten gleichmäßig über den Umfang der Lagerbuchse verteilt sind, um eine genaue Führung des Ankerbolzens 18 zu gewährleisten. Eine besonders wirtschaftliche Ausgestaltung der erfindungsgemäßen Lagerschale sieht vor, dass die Axialnuten 56b so dimensioniert werden, dass die Kontaktfläche zwischen der Lagerfläche 55 und Ankerbolzen 18 minimiert und in Folge dessen der Reibungswiderstand verringert wird. Dadurch ist es auch möglich, die Innenbohrung 55 der Lagerbuchse 52 durch über die ganze Länge konstant zu halten und schon beim Umformen fertigzustellen.In FIG. 2 a groove 56 is arranged in the upper region of the plan view, which extends axially over the entire length of the bearing bush 52. The axial groove 56 forms after pressing the bearing bush 52 into the receptacle 53 a cavity which serves for pressure equalization in the cavity 54 when moving the anchor bolt 18. In different embodiments, a plurality of axial grooves may also be arranged on the outer side (cf., reference numeral 56a) and / or on the inner side, that is, the bearing surface 55 (see reference numeral 56b). It should be noted that the axial grooves are evenly distributed over the circumference of the bearing bush to ensure accurate guidance of the anchor bolt 18. A particularly economical embodiment of the bearing shell according to the invention provides that the axial grooves 56b are dimensioned so that the contact surface between the bearing surface 55 and anchor bolt 18 minimized and as a result, the frictional resistance is reduced. As a result, it is also possible to keep the inner bore 55 of the bearing bush 52 constant over the entire length and finish it during the forming process.

Der Innendurchmesser d und der Außendurchmesser D und somit die Wandstärke der Lagerbuchse 52 können im Wesentlichen beliebig gewählt werden. Mit der Lagerbuchse 52 können somit relativ große Durchmesserunterschiede zwischen dem Ankerbolzen 18 und der Aufnahme der Lagerbuchse 52 im Magnettopf 20 ausgeglichen werden. Dies erleichtert die Herstellung des Magnettopfs 20, da dieser im Bereich des Ankers 16 einen relativ großen Durchmesser aufweisen muss und die sich daran anschließende Aufnahme für die Lagerbuchse 52 im Durchmesser nur wenig kleiner ausgeführt werden muss, da der Durchmesserunterschied zum Ankerbolzen 18 durch die Lagerbuchse 52 ausgeglichen wird.The inner diameter d and the outer diameter D and thus the wall thickness of the bearing bush 52 can be selected substantially arbitrarily. With the bearing bush 52 thus relatively large differences in diameter between the anchor bolt 18 and the recording of the bearing bush 52 in the magnet pot 20 can be compensated. This facilitates the production of the magnetic pot 20, since this must have a relatively large diameter in the region of the armature 16 and the adjoining receptacle for the bearing bush 52 in diameter only has to be made slightly smaller, since the difference in diameter to the anchor bolt 18 through the bearing bush 52 is compensated.

Claims (10)

Kraftstoffzumesseinheit (1) zur Fördermengenregelung einer Kraftstoffdruckpumpe einer Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine, wobei die Kraftstoffzumesseinheit (1) ein von einem Elektromagneten (10) betätigtes Regelventil aufweist, wobei der Elektromagnet (10) durch seine Magnetkraft einen Ankerbolzen (18) bewegt und wobei der Ankerbolzen (18) in wenigstens einer Lagerbuchse (52) axial verschiebbar gelagert ist, dadurch gekennzeichnet, dass die wenigstens eine Lagerbuchse (52) mindestens eine Axialnut (56; 56a; 56b) aufweist.A fuel metering unit (1) for controlling the flow rate of a fuel pressure pump of a fuel injector for an internal combustion engine, the fuel metering unit (1) having a control valve actuated by an electromagnet (10), the solenoid (10) moving an armature bolt (18) by its magnetic force, and wherein the armature bolt (18) is axially displaceably mounted in at least one bearing bush (52), characterized in that the at least one bearing bush (52) has at least one axial groove (56; 56a; 56b). Kraftstoffzumesseinheit (1) nach Anspruch 1, dadurch gekennzeichnet, dass die mindestens eine Axialnut (56; 56a) an einer Außenseite der Lagerbuchse (52) angeordnet ist.Fuel metering unit (1) according to claim 1, characterized in that the at least one axial groove (56; 56a) is arranged on an outer side of the bearing bush (52). Kraftstoffzumesseinheit (1) nach Anspruch 1, dadurch gekennzeichnet, dass die mindestens eine Axialnut (56b) an einer Innenseite (55) der Lagerbuchse (52) angeordnet ist.Fuel metering unit (1) according to claim 1, characterized in that the at least one axial groove (56b) on an inner side (55) of the bearing bush (52) is arranged. Kraftstoffzumesseinheit (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass mehrere Axialnuten (56; 56a; 56b) gleichmäßig über einen Umfang der Lagerbuchse (52) verteilt sind.Fuel metering unit (1) according to one of the preceding claims, characterized in that a plurality of axial grooves (56; 56a; 56b) are distributed uniformly over a circumference of the bearing bush (52). Kraftstoffzumesseinheit (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Innenseite der Lagerbuchse bereichsweise zylindrisch ausgeführt ist und damit bereichsweise als Lagerfläche für den Ankerbolzen wirkt.Fuel metering unit (1) according to one of the preceding claims, characterized in that the inside of the bearing bush is made partially cylindrical and thus partially acts as a bearing surface for the anchor bolt. Kraftstoffzumesseinheit (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass ein Innendurchmesser der Lagerbuchse bereichsweise größer ist als der Innendurchmesser im Bereich der Lagerfläche.Fuel metering unit (1) according to one of the preceding claims, characterized in that an inner diameter of the bearing bush is larger in regions than the inner diameter in the region of the bearing surface. Kraftstoffzumesseinheit (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Lagerbuchse (52) durch Umformen, insbesondere Ziehen oder Strangpressen, hergestellt ist.Fuel metering unit (1) according to one of the preceding claims, characterized in that the bearing bush (52) is produced by forming, in particular drawing or extrusion. Kraftstoffzumesseinheit (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Regelventil ein Ventilglied (34) aufweist, und dass das Ventilglied (34) mit dem Ankerbolzen (18) zusammenwirkt.Fuel metering unit (1) according to one of the preceding claims, characterized in that the control valve has a valve member (34), and that the valve member (34) cooperates with the anchor bolt (18). Kraftstoffzumesseinheit (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass an dem Ankerbolzen (18) ein Anker (16) angeordnet ist.Fuel metering unit (1) according to one of the preceding claims, characterized in that an armature (16) is arranged on the anchor bolt (18). Kraftstoff-Hochdruckpumpe für eine Kraftstoffeinspritzvorrichtung einer Brennkraftmaschine mit einer Kraftstoffzumesseinheit (1) zur saugseitigen Fördermengenregelung, dadurch gekennzeichnet, dass die Kraftstoffzumesseinheit (1) nach einem der Ansprüche 1 bis 9 ausgebildet ist.High-pressure fuel pump for a fuel injection device of an internal combustion engine having a fuel metering unit (1) for suction-side flow rate control, characterized in that the fuel metering unit (1) is designed according to one of claims 1 to 9.
EP09173591A 2008-11-17 2009-10-21 Fuel measuring unit for a fuel pump Active EP2187037B1 (en)

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ATE547619T1 (en) 2012-03-15

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