WO2012072460A1 - Metering unit and high pressure pump - Google Patents
Metering unit and high pressure pump Download PDFInfo
- Publication number
- WO2012072460A1 WO2012072460A1 PCT/EP2011/070761 EP2011070761W WO2012072460A1 WO 2012072460 A1 WO2012072460 A1 WO 2012072460A1 EP 2011070761 W EP2011070761 W EP 2011070761W WO 2012072460 A1 WO2012072460 A1 WO 2012072460A1
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- Prior art keywords
- metering unit
- valve piston
- pressure pump
- valve
- hollow
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Classifications
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- 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
- F02M59/366—Valves being actuated electrically
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- 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
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- 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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/02—Fuel-injection apparatus having means for reducing wear
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- 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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/90—Selection of particular materials
- F02M2200/9038—Coatings
Definitions
- the present invention relates to a metering unit for a high pressure pump of a fuel injection system, in particular a common rail system, an internal combustion engine according to the preamble of claim 1 and a high pressure pump according to the preamble of claim 8.
- a fuel inlet side (suction side) flow control wherein the flowing into the pump elements of the radial piston pump fuel is metered by a attached to the radial piston pump metering unit (ZME).
- ZME radial piston pump metering unit
- a metering unit comprises, for example, a continuously variable solenoid valve which adapts the amount of fuel delivered to the high-pressure accumulator to the system requirement.
- a radial piston pump for a fuel injection system of an internal combustion engine which has a metering unit for flow rate control, which is arranged in a distributor element, is known from DE 10 2007 057 503 A1.
- DE 198 01 355 B4 describes a high-pressure pump for generating high-pressure fuel in a common-rail injection system, in which a metering unit for the total fuel flow is integrated, which ensures that only a preselected delivery flow in the high-pressure pump is subjected to high pressure.
- critical fuels such as fuels with poor lubricity, low vapor pressure, or water-containing fuels, between the valve piston of the metering unit and a spill valve of the known from the prior art configurations, increased wear.
- the metering unit become so stiff that a volume control is no longer possible, resulting in an undesirable emergency driving and / or a stoppage of the motor vehicle result.
- a metering unit for a high-pressure pump of a fuel injection system of an internal combustion engine in particular of a common rail system, which comprises a magnetic valve which has a hollow core formed on at least a magnetic core, wherein in the hollow cylindrical portion formed by a magnetic force actuated Valve piston is arranged, which is movable back and forth in the hollow cylindrical portion to release according to its position a flow area, the piston is at least partially provided with a wear-reducing, hard and / or corrosion-resistant coating.
- the coating is provided on an outer circumference of the valve piston, in particular on the valve piston lateral surface.
- the protective layer is a chromium-nickel protective layer, which has a thickness of 3 to 4 ⁇ .
- a carbon wear protection layer according to a further embodiment, which has a thickness of about 4 ⁇ .
- Other materials that can be used for the protective layer are, for example, PTFE and MoS 2 and graphite-containing low-friction coatings, such. MnPh.
- the coating is provided on an inner circumference of the valve piston.
- the solenoid valve is a proportional valve.
- valve piston is formed as a hollow cylinder.
- a spring in particular a helical spring, is arranged in the hollow-cylindrical valve piston. It is also preferred if the metering unit can be attached to the high-pressure pump, in particular screwed, is.
- a high pressure pump for a fuel injection system in particular for a common rail system, an internal combustion engine, wherein the high pressure pump is provided with a metering unit according to the above embodiments.
- the metering unit equipped high pressure pump ensures reliable operation of the internal combustion engine.
- Fig. 1 is a schematic representation of a fuel injection system according to the prior art
- Fig. 2 is a sectional view through a metering unit according to the prior art.
- FIG 3 is an exploded view of a magnetic core of a metering unit according to an embodiment.
- Fig. 1 is a schematic representation of a fuel injection system 1 according to the prior art shown.
- fuel is conveyed to a high-pressure pump 5 by means of a fuel pump 3 via a fuel line 4, which is designed here as a radial piston pump.
- the fuel injection system 1 further comprises a metering unit 6 and a high-pressure accumulator 7, which is also referred to as a rail, which in turn is connected to injection valves, not shown here, which inject fuel into a likewise not shown combustion chamber of an internal combustion engine.
- the metering unit 6 serves to variably adjust the inflow of fuel from the fuel delivery pump 3 to the high-pressure pump 5 as needed.
- an overflow valve 8 is arranged, which serves, from the fuel delivery pump 3 too much subsidized fuel, which can not reach the high-pressure pump 5 completely or partially closed metering unit 6, and to return via the return line 9 in the fuel tank 2.
- the fuel delivery pump 3, the metering unit 6 and the overflow valve 8 are assigned to a low-pressure circuit of the fuel injection system 1.
- the high-pressure pump 5 and the high-pressure accumulator 7, however, are assigned to a high-pressure circuit.
- a sectional view through a metering unit 6 is shown, which has a continuously variable solenoid valve 10, the fuel inlet side or suction side flow control of the fuel supply to a high-pressure pump (see FIG. 1), to which the metering unit. 6 cultivable, performs.
- the solenoid valve 10 is arranged in a magnet housing 11. In the magnet housing 11, a plug 12 is also housed with an electrical interface, via which the solenoid valve 10 can be supplied with power.
- the solenoid valve 10 fits in one
- High-pressure accumulator (see Fig. 1) of the fuel injection system delivered amount of fuel to the power requirement of the fuel injection system.
- the solenoid valve 10 has a bearing 13, an armature 14 with plunger, a winding with bobbin 15, a pot 16, a residual air gap disk 17 and a magnetic core 18. Furthermore, below the armature 14, a valve piston 19 with control slots, which is surrounded by a spring 20, arranged.
- the metering unit 6 is sealed by means of a plurality of O-rings 21.
- the control of the solenoid valve 2 is done by means of a PWM signal.
- 3 shows an exploded view of a magnetic core 18 of a metering unit 6 according to an embodiment.
- the magnetic core 18 is formed at a lower portion 22 of a hollow cylinder.
- valve piston 19 In the hollow cylindrical portion 22 of the magnetically actuable valve piston 19 is receivable, which is movable back and forth therein to release according to its position a flow cross-section or the openings formed by the inlet holes 23 so that fuel into the metering unit 6 (Fig. see Fig. 2) can occur.
- the valve piston 19 is also formed as a hollow cylinder, so that the spring 20 is receivable therein.
- a plurality of O-rings 26 are disposed on the magnetic core 18 for sealing the magnetic core 18 and the metering unit 6, respectively (see FIG. 2).
- the valve piston 19 according to the embodiment is provided with a wear-reducing, hard and a corrosion-resistant coating 26 at its outer periphery 24 formed by the valve piston skirt 25.
- valve piston 19 may also be provided on its inner circumference 27 with the coating 26, so that a protection in the contact region of the spring 20 is provided with the inner circumference 27.
- a metering unit 6 is provided by the configuration according to the invention, which is particularly robust and therefore can ensure reliable operation of a high-pressure pump 5 in a fuel injection system 1.
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- 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 metering unit for a high pressure pump of a fuel injection system of an internal combustion engine, in particular of a common-rail system, which metering unit comprises a solenoid valve which has a solenoid core of hollow-cylindrical configuration in at least one section, wherein a valve piston which is actuated by magnetic force is arranged in the section of hollow-cylindrical configuration, which valve piston can be moved to and fro in the section of hollow-cylindrical configuration, in order to open a throughflow cross section in accordance with its position, wherein the valve piston is provided at least partially with a wear-reducing, hard and/or corrosion-resistant coating. Moreover, the invention relates to a high pressure pump for a fuel injection system, in particular for a common-rail system, of an internal combustion engine, wherein the high pressure pump is provided with a metering unit.
Description
Beschreibung Titel Description title
Zumesseinheit und Hochdruckpumpe Metering unit and high pressure pump
Die vorliegende Erfindung betrifft eine Zumesseinheit für eine Hochdruckpumpe eines Kraftstoffeinspritzsystems, insbesondere eines Common-Rail-Systems, einer Brennkraftmaschine gemäß dem Oberbegriff des Anspruchs 1 und eine Hochdruckpumpe gemäß dem Oberbegriff des Anspruchs 8. The present invention relates to a metering unit for a high pressure pump of a fuel injection system, in particular a common rail system, an internal combustion engine according to the preamble of claim 1 and a high pressure pump according to the preamble of claim 8.
Stand der Technik State of the art
Im Stand der Technik sind Kraftstoffeinspritzsysteme, z. B. Common Rail Systeme bekannt, die eine Radialkolbenpumpe zum Bereitstellen von unter Hochdruck stehendem Kraftstoff an einen Kraftstoffspeicher aufweisen. Um den energetischen Wirkungsgrad einer derartigen Radialkolbenpumpe zu verbessern, erfolgt im Stand der Technik eine kraftstoffzulaufseitige (saugseitige) Mengenregelung, wobei der in die Pumpenelemente der Radialkolbenpumpe fließende Kraftstoff durch eine an die Radialkolbenpumpe angebaute Zumesseinheit (ZME) dosiert wird. Eine derartige Zumesseinheit umfasst beispielsweise ein stufenlos regelbares Magnetventil, welches die in den Hochdruckspeicher geförderte Kraftstoffmenge dem Systembedarf anpasst. In the prior art, fuel injection systems, for. As common rail systems are known, which have a radial piston pump for providing fuel under high pressure to a fuel storage. In order to improve the energy efficiency of such a radial piston pump, in the prior art, a fuel inlet side (suction side) flow control, wherein the flowing into the pump elements of the radial piston pump fuel is metered by a attached to the radial piston pump metering unit (ZME). Such a metering unit comprises, for example, a continuously variable solenoid valve which adapts the amount of fuel delivered to the high-pressure accumulator to the system requirement.
Eine Radialkolbenpumpe für ein Kraftstoffeinspritzsystem einer Brennkraftmaschine, welche eine Zumesseinheit zur Fördermengenregelung aufweist, welche in einem Verteilerelement angeordnet ist, ist aus DE 10 2007 057 503 A1 bekannt. A radial piston pump for a fuel injection system of an internal combustion engine, which has a metering unit for flow rate control, which is arranged in a distributor element, is known from DE 10 2007 057 503 A1.
Darüber hinaus ist in DE 198 01 355 B4 eine Hochdruckpumpe zur Kraftstoffhochdruckerzeugung in einem Common-Rail-Einspritzsystem beschrieben, in welche eine Zumesseinheit für den Gesamtkraftstoffstrom integriert ist, die dafür sorgt, dass nur ein vorgewählter Förderstrom in der Hochdruckpumpe mit Hochdruck beaufschlagt wird.
Beim Einsatz von kritischen Kraftstoffen, wie beispielsweise Kraftstoffe mit schlechter Schmierfähigkeit, niedrigem Dampfdruck, oder Wasser enthaltende Kraftstoffe, entsteht zwischen dem Ventilkolben der Zumesseinheit und einem Überströmventilträger der aus dem Stand der Technik bekannten Konfigurationen ein erhöhter Verschleiß. In addition, DE 198 01 355 B4 describes a high-pressure pump for generating high-pressure fuel in a common-rail injection system, in which a metering unit for the total fuel flow is integrated, which ensures that only a preselected delivery flow in the high-pressure pump is subjected to high pressure. When using critical fuels, such as fuels with poor lubricity, low vapor pressure, or water-containing fuels, between the valve piston of the metering unit and a spill valve of the known from the prior art configurations, increased wear.
Zusätzlich kann durch an dem Ventilkolben auftretende Oberflächenkorrosion die Zumesseinheit so schwergängig werden, dass eine Mengenregelung nicht mehr möglich ist, was einen unerwünschten Notfahrbetrieb und/oder ein Liegenbleiben des Kraftfahrzeugs zur Folge hat. In addition, by surface corrosion occurring on the valve piston, the metering unit become so stiff that a volume control is no longer possible, resulting in an undesirable emergency driving and / or a stoppage of the motor vehicle result.
Daher ist es notwendig, eine Zumesseinheit für ein Kraftstoffeinspritzsystem einer Brennkraftmaschine, insbesondere für ein Common-Rail-System, zu schaffen, bei der Verschleiß reduziert wird und Korrosion am Ventilkolben vermieden wird. Therefore, it is necessary to provide a metering unit for a fuel injection system of an internal combustion engine, in particular for a common rail system, in which wear is reduced and corrosion on the valve piston is avoided.
Offenbarung der Erfindung Vorteile der Erfindung Disclosure of the Invention Advantages of the Invention
Erfindungsgemäß wird eine Zumesseinheit für eine Hochdruckpumpe eines Kraftstoffeinspritzsystems einer Brennkraftmaschine, insbesondere eines Com- mon-Rail-Systems, bereitgestellt, welche ein Magnetventil umfasst, welches einen an zumindest einem Abschnitt hohlzylindrisch ausgebildeten Magnetkern aufweist, wobei in dem hohlzylindrisch ausgebildeten Abschnitt ein durch Magnetkraft betätigter Ventilkolben angeordnet ist, welcher in dem hohlzylindrisch ausgebildeten Abschnitt hin- und her bewegbar ist, um entsprechend seiner Stellung einen Durchflussquerschnitt freizugeben, wobei der Kolben zumindest teilweise mit einer verschleißreduzierenden, harten und/oder einer korrosionsbeständigen Beschichtung versehen ist. Durch Vorsehen der Beschichtung an dem Kolben wird Verschleiß an der Ventilkolbenmantelfläche und am Magnetkern im Bereich des hohlzylindrischen Abschnitts, in welchem der Ventilkolben angeordnet ist, effektiv vermieden. Darüber hinaus kann ebenfalls eine Korrosion am Ventilkolben und damit ein Ausfall der Zumesseinheit zuverlässig vermieden werden.
Gemäß einer bevorzugten Ausführungsform ist die Beschichtung an einem äußeren Umfang des Ventilkolbens, insbesondere an der Ventilkolbenmantelfläche, vorgesehen. Durch Vorsehen einer Schutzschicht auf der Ventilkolbenmantelflä- che werden sowohl der Ventilkolben als auch der damit im Bereich des hohlzylindrischen Abschnitts mit diesem in Kontakt stehende Magnetkern effektiv vor Verschleiß geschützt. According to the invention, a metering unit for a high-pressure pump of a fuel injection system of an internal combustion engine, in particular of a common rail system, is provided, which comprises a magnetic valve which has a hollow core formed on at least a magnetic core, wherein in the hollow cylindrical portion formed by a magnetic force actuated Valve piston is arranged, which is movable back and forth in the hollow cylindrical portion to release according to its position a flow area, the piston is at least partially provided with a wear-reducing, hard and / or corrosion-resistant coating. By providing the coating on the piston wear on the valve piston lateral surface and the magnetic core in the region of the hollow cylindrical portion, in which the valve piston is arranged, effectively avoided. In addition, a corrosion on the valve piston and thus a failure of the metering unit can also be reliably avoided. According to a preferred embodiment, the coating is provided on an outer circumference of the valve piston, in particular on the valve piston lateral surface. By providing a protective layer on the valve piston surface, both the valve piston and the magnetic core in contact therewith in the region of the hollow cylindrical section are effectively protected against wear.
Vorzugsweise ist die Schutzschicht eine Chrom-Nickel-Schutzschicht, welche eine Dicke von 3 bis 4 μηι aufweist. Es ist jedoch auch möglich, gemäß einer weiteren Ausführungsform eine Kohlenstoff-Verschleißschutzschicht vorzusehen, welche eine Dicke von ungefähr 4 μηι aufweist. Andere Materialien, welche für die Schutzschicht verwendet werden können, sind beispielsweise PTFE sowie MoS2 und graphithaltige Gleitlacke, wie z. B. MnPh. Preferably, the protective layer is a chromium-nickel protective layer, which has a thickness of 3 to 4 μηι. However, it is also possible to provide a carbon wear protection layer according to a further embodiment, which has a thickness of about 4 μηι. Other materials that can be used for the protective layer are, for example, PTFE and MoS 2 and graphite-containing low-friction coatings, such. MnPh.
Gemäß noch einer bevorzugten Ausführungsform ist die Beschichtung an einem inneren Umfang des Ventilkolbens vorgesehen. Hierdurch wird ein effektiver Schutz im Bereich des Kontakts zwischen der Ventilkolbeninnenfläche und der darin aufgenommenen Feder vorgesehen. According to another preferred embodiment, the coating is provided on an inner circumference of the valve piston. As a result, an effective protection in the region of the contact between the valve piston inner surface and the spring received therein is provided.
Gemäß einer weiteren bevorzugten Ausführungsform ist das Magnetventil ein Proportionalventil. According to a further preferred embodiment, the solenoid valve is a proportional valve.
Vorzugsweise ist der Ventilkolben hohlzylindrisch ausgebildet. Preferably, the valve piston is formed as a hollow cylinder.
Darüber hinaus ist in noch einer weiteren bevorzugten Ausführungsform in dem hohlzylindrisch ausgebildeten Ventilkolben eine Feder, insbesondere eine Schraubenfeder, angeordnet. Es ist auch bevorzugt, wenn die Zumesseinheit an die Hochdruckpumpe anbaubar, insbesondere anschraubbar, ist. In addition, in a further preferred embodiment, a spring, in particular a helical spring, is arranged in the hollow-cylindrical valve piston. It is also preferred if the metering unit can be attached to the high-pressure pump, in particular screwed, is.
Gemäß der Erfindung wird weiterhin eine Hochdruckpumpe für ein Kraftstoffeinspritzsystem, insbesondere für ein Common-Rail-System, einer Brennkraftma- schine, bereitgestellt, wobei die Hochdruckpumpe mit einer Zumesseinheit gemäß den obigen Ausführungsformen versehen ist. Mit der mit der Zumesseinheit
ausgestatteten Hochdruckpumpe wird ein zuverlässiger Betrieb der Brennkraftmaschine gewährleistet. According to the invention, there is further provided a high pressure pump for a fuel injection system, in particular for a common rail system, an internal combustion engine, wherein the high pressure pump is provided with a metering unit according to the above embodiments. With the with the metering unit equipped high pressure pump ensures reliable operation of the internal combustion engine.
Kurze Beschreibung der Zeichnungen Brief description of the drawings
Im Nachfolgenden werden Ausführungsbeispiele der Erfindung unter Bezugnahme auf die beigefügten Zeichnungen näher beschrieben. Es zeigt: Hereinafter, embodiments of the invention will be described in more detail with reference to the accompanying drawings. It shows:
Fig. 1 eine schematische Darstellung eines Kraftstoffeinspritzsystems gemäß dem Stand der Technik; Fig. 1 is a schematic representation of a fuel injection system according to the prior art;
Fig. 2 eine Schnittansicht durch eine Zumesseinheit gemäß dem Stand der Technik; und Fig. 2 is a sectional view through a metering unit according to the prior art; and
Fig. 3 eine Explosionsdarstellung eines Magnetkerns einer Zumesseinheit gemäß einer Ausführungsform. 3 is an exploded view of a magnetic core of a metering unit according to an embodiment.
Ausführungsformen der Erfindung Embodiments of the invention
In Fig. 1 ist eine schematische Darstellung eines Kraftstoffeinspritzsystems 1 gemäß dem Stand der Technik gezeigt. Aus einem Kraftstofftank 2 wird mittels einer Kraftstoffförderpumpe 3 über eine Kraftstoffleitung 4 Kraftstoff zu einer Hochdruckpumpe 5 gefördert, die hier als Radialkolbenpumpe ausgebildet ist. Das Kraftstoffeinspritzsystem 1 umfasst weiterhin eine Zumesseinheit 6 und einen Hochdruckspeicher 7, der auch als Rail bezeichnet wird, welcher wiederum mit hier nicht dargestellten Einspritzventilen verbunden ist, die Kraftstoff in einen ebenfalls nicht dargestellten Brennraum einer Brennkraftmaschine einspritzen. Die Zumesseinheit 6 dient dazu, den Zufluss von Kraftstoff von der Kraftstoffförderpumpe 3 zu der Hochdruckpumpe 5 bedarfsabhängig variabel einzustellen. Durch die Zumesseinheit 6 wird dabei ein variabler Durchflussquerschnitt zwischen der Kraftstoffförderpumpe 3 und der Hochdruckpumpe 5 eingestellt, um eine Anpassung der durch die Hochdruckpumpe 5 in den Hochdruckspeicher 7 geförderten Kraftstoffmenge an den Bedarf der Brennkraftmaschine zu ermöglichen. In der Zuleitung zu der Zumesseinheit 6 von der Kraftstoffförderpumpe 3 ist ein Überströmventil 8 angeordnet, das dazu dient, von der Kraftstoffförderpumpe
3 zu viel geförderten Kraftstoff, der bei ganz oder teilweise geschlossener Zumesseinheit 6 nicht zur Hochdruckpumpe 5 gelangen kann, abzusteuern und über die Rücklaufleitung 9 in den Kraftstofftank 2 zurückzuführen. Die Kraftstoffförderpumpe 3, die Zumesseinheit 6 und das Überströmventil 8 sind einem Nie- derdruckkreislauf des Kraftstoffeinspritzsystems 1 zuzuordnen. Die Hochdruckpumpe 5 und der Hochdruckspeicher 7 sind dagegen einem Hochdruckkreislauf zuzuordnen. In Fig. 1 is a schematic representation of a fuel injection system 1 according to the prior art shown. From a fuel tank 2 fuel is conveyed to a high-pressure pump 5 by means of a fuel pump 3 via a fuel line 4, which is designed here as a radial piston pump. The fuel injection system 1 further comprises a metering unit 6 and a high-pressure accumulator 7, which is also referred to as a rail, which in turn is connected to injection valves, not shown here, which inject fuel into a likewise not shown combustion chamber of an internal combustion engine. The metering unit 6 serves to variably adjust the inflow of fuel from the fuel delivery pump 3 to the high-pressure pump 5 as needed. By the metering unit 6 while a variable flow cross-section between the fuel delivery pump 3 and the high-pressure pump 5 is set to allow adjustment of the funded by the high pressure pump 5 in the high-pressure accumulator 7 amount of fuel to the needs of the internal combustion engine. In the supply line to the metering unit 6 of the fuel delivery pump 3, an overflow valve 8 is arranged, which serves, from the fuel delivery pump 3 too much subsidized fuel, which can not reach the high-pressure pump 5 completely or partially closed metering unit 6, and to return via the return line 9 in the fuel tank 2. The fuel delivery pump 3, the metering unit 6 and the overflow valve 8 are assigned to a low-pressure circuit of the fuel injection system 1. The high-pressure pump 5 and the high-pressure accumulator 7, however, are assigned to a high-pressure circuit.
In Fig. 2 ist eine Schnittansicht durch eine Zumesseinheit 6 gemäß dem Stand der Technik gezeigt, welche ein stufenlos regelbares Magnetventil 10 aufweist, welches eine kraftstoffzulaufseitige bzw. saugseitige Mengenregelung der Kraftstoffzuführung zu einer Hochdruckpumpe (siehe Fig. 1), an welche die Zumesseinheit 6 anbaubar ist, durchführt. Das Magnetventil 10 ist in einem Magnetgehäuse 11 angeordnet. In dem Magnetgehäuse 11 ist darüber hinaus ein Stecker 12 mit einer elektrischen Schnittstelle untergebracht, über die das Magnetventil 10 mit Strom versorgt werden kann. Das Magnetventil 10 passt die in einen 2, a sectional view through a metering unit 6 according to the prior art is shown, which has a continuously variable solenoid valve 10, the fuel inlet side or suction side flow control of the fuel supply to a high-pressure pump (see FIG. 1), to which the metering unit. 6 cultivable, performs. The solenoid valve 10 is arranged in a magnet housing 11. In the magnet housing 11, a plug 12 is also housed with an electrical interface, via which the solenoid valve 10 can be supplied with power. The solenoid valve 10 fits in one
Hochdruckspeicher (siehe Fig. 1) des Kraftstoffeinspritzsystems geförderte Kraftstoffmenge dem Leistungsbedarf des Kraftstoffeinspritzsystems an. Das Magnetventil 10 weist ein Lager 13, einen Anker 14 mit Stößel, eine Wicklung mit Spulenkörper 15, einen Topf 16, eine Restluftspaltscheibe 17 und einen Magnetkern 18 auf. Weiterhin ist unterhalb des Ankers 14 ein Ventilkolben 19 mit Steuerschlitzen, der von einer Feder 20 umgeben ist, angeordnet. Die Zumesseinheit 6 ist mittels einer Vielzahl von O-Ringen 21 abgedichtet. Die Ansteuerung des Magnetventils 2 geschieht mittels eines PWM-Signals. Fig. 3 zeigt eine Explosionsdarstellung eines Magnetkerns 18 einer Zumesseinheit 6 gemäß einer Ausführungsform. Der Magnetkern 18 ist an einem unteren Abschnitt 22 hohlzylindrisch ausgebildet. In dem hohlzylindrischen Abschnitt 22 ist der durch Magnetkraft betätigbare Ventilkolben 19 aufnehmbar, welcher darin hin- und her bewegbar ist, um entsprechend seiner Stellung einen Durchfluss- querschnitt bzw. die durch die Zulaufbohrungen 23 gebildeten Öffnungen freizugeben, so dass Kraftstoff in die Zumesseinheit 6 (siehe Fig. 2) eintreten kann. Der Ventilkolben 19 ist ebenfalls hohlzylindrisch ausgebildet, so dass die Feder 20 darin aufnehmbar ist. Eine Vielzahl von O-Ringen 26 ist zum Abdichten des Magnetkerns 18 bzw. der Zumesseinheit 6 (siehe Fig. 2) an dem Magnetkern 18 angeordnet.
Der Ventilkolben 19 gemäß der Ausführungsform ist an seinem äußeren Umfang 24, der durch die Ventilkolbenmantelfläche 25 gebildet wird, mit einer verschleißreduzierenden, harten und einer korrosionsbeständigen Beschichtung 26 versehen. Hierdurch wird der durch die Hin- und Herbewegung des Ventilkolbens 19 in dem hohlzylindrischen Abschnitt 22 des Magnetkerns 18 verursachte Verschleiß deutlich reduziert. Auch wird durch Vermeiden von Korrosion an der beschichteten Oberfläche der optimale und fehlerfreie Betrieb der Zumesseinheit 6 (siehe Fig. 2) sichergestellt. Zusätzlich kann der Ventilkolben 19 auch an seinem inneren Umfang 27 mit der Beschichtung 26 versehen sein, so dass ein Schutz im Kontaktbereich der Feder 20 mit dem inneren Umfang 27 geschaffen wird. High-pressure accumulator (see Fig. 1) of the fuel injection system delivered amount of fuel to the power requirement of the fuel injection system. The solenoid valve 10 has a bearing 13, an armature 14 with plunger, a winding with bobbin 15, a pot 16, a residual air gap disk 17 and a magnetic core 18. Furthermore, below the armature 14, a valve piston 19 with control slots, which is surrounded by a spring 20, arranged. The metering unit 6 is sealed by means of a plurality of O-rings 21. The control of the solenoid valve 2 is done by means of a PWM signal. 3 shows an exploded view of a magnetic core 18 of a metering unit 6 according to an embodiment. The magnetic core 18 is formed at a lower portion 22 of a hollow cylinder. In the hollow cylindrical portion 22 of the magnetically actuable valve piston 19 is receivable, which is movable back and forth therein to release according to its position a flow cross-section or the openings formed by the inlet holes 23 so that fuel into the metering unit 6 (Fig. see Fig. 2) can occur. The valve piston 19 is also formed as a hollow cylinder, so that the spring 20 is receivable therein. A plurality of O-rings 26 are disposed on the magnetic core 18 for sealing the magnetic core 18 and the metering unit 6, respectively (see FIG. 2). The valve piston 19 according to the embodiment is provided with a wear-reducing, hard and a corrosion-resistant coating 26 at its outer periphery 24 formed by the valve piston skirt 25. As a result, the wear caused by the reciprocating movement of the valve piston 19 in the hollow cylindrical portion 22 of the magnetic core 18 is significantly reduced. Also, by avoiding corrosion on the coated surface, the optimum and error-free operation of the metering unit 6 (see Fig. 2) is ensured. In addition, the valve piston 19 may also be provided on its inner circumference 27 with the coating 26, so that a protection in the contact region of the spring 20 is provided with the inner circumference 27.
Insgesamt betrachtet wird durch die erfindungsgemäße Konfiguration eine Zumesseinheit 6 bereitgestellt, die besonders robust ist und daher einen zuverlässigen Betrieb einer Hochdruckpumpe 5 in einem Kraftstoffeinspritzsystem 1 gewährleisten kann.
Overall, a metering unit 6 is provided by the configuration according to the invention, which is particularly robust and therefore can ensure reliable operation of a high-pressure pump 5 in a fuel injection system 1.
Claims
Ansprüche claims
Zumesseinheit (6) für eine Hochdruckpumpe (5) eines Kraftstoffeinspritzsystems (1), insbesondere eines Common-Rail-Systems, einer Brennkraftmaschine, welche ein Magnetventil (10) umfasst, welches einen an zumindest einem Abschnitt (22) hohlzylindrisch ausgebildeten Magnetkern (18) aufweist, wobei in dem hohlzylindrisch ausgebildeten Abschnitt (22) ein durch Magnetkraft betätigter Ventilkolben (19) angeordnet ist, welcher in dem hohlzylindrisch ausgebildeten Abschnitt (22) hin- und her bewegbar ist, um entsprechend seiner Stellung einen Durchflussquerschnitt freizugeben, dadurch gekennzeichnet, dass Metering unit (6) for a high-pressure pump (5) of a fuel injection system (1), in particular of a common rail system, of an internal combustion engine which comprises a magnetic valve (10) which has a magnetic core (18) which is hollow-cylindrical on at least one section (22). wherein in the hollow cylindrical portion (22) a solenoid-actuated valve piston (19) is arranged, which in the hollow cylindrical portion (22) back and forth to release according to its position a flow cross-section, characterized in that
der Ventilkolben (19) zumindest teilweise mit einer verschleißreduzierenden, harten und/oder einer korrosionsbeständigen Beschichtung (26) versehen ist. the valve piston (19) is at least partially provided with a wear-reducing, hard and / or a corrosion-resistant coating (26).
Zumesseinheit (6) nach Anspruch 1 , A metering unit (6) according to claim 1,
dadurch gekennzeichnet, dass characterized in that
die Beschichtung (26) an einem äußeren Umfang (24) des Ventilkolbens (19), insbesondere an der Ventilkolbenmantelfläche (25), vorgesehen ist. the coating (26) is provided on an outer circumference (24) of the valve piston (19), in particular on the valve piston lateral surface (25).
Zumesseinheit (6) nach Anspruch 1 oder 2, A metering unit (6) according to claim 1 or 2,
dadurch gekennzeichnet, dass characterized in that
die Beschichtung (26) an einem inneren Umfang (27) des Ventilkolbens (19) vorgesehen ist. the coating (26) is provided on an inner circumference (27) of the valve piston (19).
Zumesseinheit (6) nach einem oder mehreren der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass. A metering unit (6) according to one or more of claims 1 to 3, characterized in that.
das Magnetventil (10) ein Proportionalventil ist. the solenoid valve (10) is a proportional valve.
Zumesseinheit (6) nach einem oder mehreren der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass A metering unit (6) according to one or more of claims 1 to 4, characterized in that
der Ventilkolben (19) hohlzylindrisch ausgebildet ist
the valve piston (19) is formed as a hollow cylinder
6. Zumesseinheit (6) nach Anspruch 5, 6. metering unit (6) according to claim 5,
dadurch gekennzeichnet, dass characterized in that
in dem hohlzylindrisch ausgebildeten Ventilkolben (19) eine Feder (20), insbesondere eine Schraubenfeder, angeordnet ist. in the hollow cylindrical valve piston (19), a spring (20), in particular a coil spring, is arranged.
7. Zumesseinheit (6) nach einem oder mehreren der Ansprüche 1 bis 6, 7. metering unit (6) according to one or more of claims 1 to 6,
dadurch gekennzeichnet, dass characterized in that
die Zumesseinheit (6) an die Hochdruckpumpe (5) anbaubar, insbesondere anschraubbar, ist. the metering unit (6) attachable to the high pressure pump (5), in particular screwed, is.
8. Zumesseinheit (6) nach einem oder mehreren der Ansprüche 1 bis 7, 8. metering unit (6) according to one or more of claims 1 to 7,
dadurch gekennzeichnet, dass characterized in that
die Schutzschicht eine Chrom-Nickel-Schutzschicht oder eine Kohlenstoff- Verschleißschutzschicht ist, welche eine Dicke in einem Bereich von 3 bis 4 pm aufweist. the protective layer is a chromium-nickel protective layer or a carbon wear-resistant layer having a thickness in a range of 3 to 4 μm.
9. Hochdruckpumpe (5) für ein Kraftstoffeinspritzsystem (1), insbesondere für ein Common-Rail-System, einer Brennkraftmaschine, 9. High-pressure pump (5) for a fuel injection system (1), in particular for a common-rail system, an internal combustion engine,
dadurch gekennzeichnet, dass characterized in that
die Hochdruckpumpe (5) mit einer Zumesseinheit (6) gemäß einem oder mehreren der Ansprüche 1 bis 8 versehen ist.
the high-pressure pump (5) is provided with a metering unit (6) according to one or more of claims 1 to 8.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE201010062169 DE102010062169A1 (en) | 2010-11-30 | 2010-11-30 | Metering unit and high pressure pump |
| DE102010062169.2 | 2010-11-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2012072460A1 true WO2012072460A1 (en) | 2012-06-07 |
Family
ID=45002975
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2011/070761 WO2012072460A1 (en) | 2010-11-30 | 2011-11-23 | Metering unit and high pressure pump |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE102010062169A1 (en) |
| WO (1) | WO2012072460A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107269435A (en) * | 2017-07-31 | 2017-10-20 | 重庆康明斯发动机有限公司 | A kind of diesel fuel system and its electric-controlled fuel injector |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102014201387A1 (en) | 2014-01-27 | 2015-07-30 | Robert Bosch Gmbh | Electromagnetically controllable valve for a high pressure pump and high pressure pump |
| DE102014220222A1 (en) | 2014-10-07 | 2016-04-07 | Robert Bosch Gmbh | Electromagnetically actuated proportional valve |
| IT201600084888A1 (en) * | 2016-08-11 | 2018-02-11 | Bosch Gmbh Robert | PUMPING GROUP FOR FOOD FUEL, PREFERIBLY GASOIL, FROM A CONTAINMENT TANK TO AN INTERNAL COMBUSTION ENGINE |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19801355B4 (en) | 1998-01-16 | 2004-04-08 | Robert Bosch Gmbh | High-pressure pump for fuel supply in fuel injection systems of internal combustion engines |
| EP1852603A1 (en) * | 2004-09-24 | 2007-11-07 | Denso Corporation | Flow control valve |
| US20080152491A1 (en) * | 2006-12-26 | 2008-06-26 | Davies Lucy V | Coatings for use in fuel system components |
| DE102007057503A1 (en) | 2007-11-29 | 2009-06-04 | Robert Bosch Gmbh | Radial piston pump for providing high pressure fuel supply in common rail injection system of internal-combustion engine, has low pressure channel provided in distributor element, where channel hydraulically connects pump element with inlet |
| WO2009074457A1 (en) * | 2007-12-12 | 2009-06-18 | Robert Bosch Gmbh | Fuel metering device for a high-pressure fuel pump and high-pressure fuel pump |
-
2010
- 2010-11-30 DE DE201010062169 patent/DE102010062169A1/en not_active Withdrawn
-
2011
- 2011-11-23 WO PCT/EP2011/070761 patent/WO2012072460A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19801355B4 (en) | 1998-01-16 | 2004-04-08 | Robert Bosch Gmbh | High-pressure pump for fuel supply in fuel injection systems of internal combustion engines |
| EP1852603A1 (en) * | 2004-09-24 | 2007-11-07 | Denso Corporation | Flow control valve |
| US20080152491A1 (en) * | 2006-12-26 | 2008-06-26 | Davies Lucy V | Coatings for use in fuel system components |
| DE102007057503A1 (en) | 2007-11-29 | 2009-06-04 | Robert Bosch Gmbh | Radial piston pump for providing high pressure fuel supply in common rail injection system of internal-combustion engine, has low pressure channel provided in distributor element, where channel hydraulically connects pump element with inlet |
| WO2009074457A1 (en) * | 2007-12-12 | 2009-06-18 | Robert Bosch Gmbh | Fuel metering device for a high-pressure fuel pump and high-pressure fuel pump |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107269435A (en) * | 2017-07-31 | 2017-10-20 | 重庆康明斯发动机有限公司 | A kind of diesel fuel system and its electric-controlled fuel injector |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102010062169A1 (en) | 2012-05-31 |
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