WO2016055268A1 - Proportional valve that can be electromagnetically actuated and high-pressure fuel pump having such a proportional valve - Google Patents

Proportional valve that can be electromagnetically actuated and high-pressure fuel pump having such a proportional valve Download PDF

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Publication number
WO2016055268A1
WO2016055268A1 PCT/EP2015/071832 EP2015071832W WO2016055268A1 WO 2016055268 A1 WO2016055268 A1 WO 2016055268A1 EP 2015071832 W EP2015071832 W EP 2015071832W WO 2016055268 A1 WO2016055268 A1 WO 2016055268A1
Authority
WO
WIPO (PCT)
Prior art keywords
proportional valve
fuel pump
pressure fuel
housing part
adapter piece
Prior art date
Application number
PCT/EP2015/071832
Other languages
German (de)
French (fr)
Inventor
Michael IMHOF
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
Priority to EP15771905.5A priority Critical patent/EP3204630A1/en
Priority to CN201580054347.7A priority patent/CN107110094A/en
Priority to KR1020177011726A priority patent/KR20170066514A/en
Publication of WO2016055268A1 publication Critical patent/WO2016055268A1/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
    • F02M59/34—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
    • 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
    • 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
    • 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
    • F02M59/48—Assembling; Disassembling; Replacing
    • F02M59/485—Means for fixing delivery valve casing and barrel to each other or to pump casing
    • 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
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0071—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059 characterised by guiding or centering means in valves including the absence of any guiding means, e.g. "flying arrangements"
    • 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
    • F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for
    • 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
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8061—Fuel injection apparatus manufacture, repair or assembly involving press-fit, i.e. interference or friction fit

Definitions

  • the invention relates to an electromagnetically verifiable proportional valve with the features of the preamble of claim 1. Furthermore, the invention relates to a high-pressure fuel pump with such a proportional valve for controlling the flow rate.
  • German Offenlegungsschrift DE 10 2011 017 495 A1 discloses a metering unit for a high-pressure pump of a fuel injection system, in particular of a common-rail injection system, which comprises a solenoid valve.
  • the solenoid valve has a magnetic core with a central bore in which a valve piston is reciprocally accommodated.
  • the valve piston has control slots arranged on the shell side, which release or close a defined flow cross-section as a function of the axial position of the valve piston.
  • the axial position of the valve piston is variable by means of an electromagnet, which cooperates with an armature plunger unit for this purpose.
  • the plunger is used to couple the armature with the valve piston and is guided for this purpose by the magnetic core.
  • Housing bore of the high-pressure pump is inserted in such a way that the bore receiving the valve piston comes to rest within the housing bore.
  • the magnetic core has two O-rings, one of which first in the radial direction and a second seals in the axial direction.
  • a third O-ring which is arranged in the region of the connection of the magnetic core with the magnetic coil of the electromagnet.
  • the present invention is therefore an object of the invention to provide an electromagnetically actuated proportional valve for controlling the flow rate of a high-pressure pump, which is more robust compared to the known from the prior art proportional valves.
  • the proportional valve should be attachable to a high-pressure fuel pump such that a reliable over the life seal is given to the outside to maintain the functionality of the valve.
  • the electromagnetically actuated proportional valve with the features of claim 1 is proposed.
  • Advantageous developments of the invention can be found in the dependent claims.
  • a high-pressure fuel pump is further specified with such a proportional valve for controlling the flow rate.
  • the proposed proportional valve should be used in particular as a metering unit.
  • the proposed for controlling the flow rate of a high-pressure fuel pump electromagnetically actuated proportional valve comprises an electromagnet for acting on a lifting armature.
  • the armature is coupled via a plunger with an axially displaceable valve piston, so that the stroke of the armature causes an axial displacement of the valve piston against the spring force of a spring.
  • the axially displaceable valve piston is received in a flanged bush, via which the proportional valve with a housing part of the high-pressure fuel pump is connected.
  • the collar bushing thus assumes the functions of the magnetic core. Compared to the complex shape of a magnetic core, the collar bushing has a very simple form and is therefore easy and inexpensive to manufacture.
  • valve piston and the spring can be preassembled in the flanged bushing and the preassembled unit can initially be used without electromagnet in a bore on the housing part of the high-pressure fuel pump, which simplifies the cultivation of the high-pressure fuel pump.
  • the flanged bushing as an add-on component can then be connected to the other components of the proportional valve.
  • the collar bushing can be connected in a simple manner by pressing into a corresponding receiving bore of the housing part of the high-pressure fuel pump with this.
  • the interference fit of the collar bushing in the receiving bore also makes the arrangement of an additional sealing element, for example in the form of a radially sealing O-ring, dispensable. This eliminates the risk of damage to the sealing element during assembly. Sealing over the interference fit is also more robust over the service life as it is less subject to wear.
  • the collar bushing has a radially inwardly extending
  • the collar bushing is at least partially surrounded by an adapter piece, via which the collar bushing is connected to the electromagnet and / or a cup-shaped housing part for receiving the electromagnet or connectable.
  • the connection of the adapter piece with the collar socket can be made via a collar of the adapter piece, so that the adapter piece can be placed on the collar bushing, preferably be pressed on.
  • the adapter piece may be held via a press connection in the receiving bore of the housing part of the high-pressure fuel pump, which is designed for this purpose preferably as a stepped bore.
  • the adapter piece itself can be a stamped and bent part, which is simple and inexpensive to produce.
  • the adapter piece When mounting the proportional valve to the high-pressure fuel pump, the adapter piece can first be connected to the flanged bush or alternatively first with the cup-shaped housing part and / or the electromagnet.
  • the adapter piece forms a cone for automatically centering the electromagnet and / or the cup-shaped housing part when connecting to the adapter piece.
  • the adapter piece forms a radially outwardly extending flange, via which the adapter piece can be abutted axially on the outside of the housing part of the high-pressure fuel pump.
  • the flange holes may be provided for receiving screws that allow a screw connection of the adapter piece with the housing part.
  • the valve piston has at least one shell-side opening, which can be brought into coincidence with a serving as an inlet annular groove of the collar, into which opens at least one inlet bore.
  • the at least one inlet bore is preferably formed as a radial bore in the collar bushing. Also in this regard, thus replacing the collar bushing the missing magnetic core, in which usually the inlet holes are formed.
  • the armature is designed as a plunger anchor and firmly connected to the plunger. Preferably, the plunger is pressed into the anchor. Because The characteristic of the mechanical part of the proportional valve can be specified via the press-in depth.
  • the high-pressure fuel pump comprises a housing part, in which a receiving bore is formed, in which the collar bushing of the proportional valve is inserted, preferably pressed.
  • a seal to the outside via an additional sealing element in particular a radially sealing O-ring, is dispensable.
  • the seal is effected solely via the interference fit, which is less subject to wear in relation to a radially sealing O-ring inserted into the receiving bore. The risk of a hydraulic bypass is thus minimized and ensures correct metering.
  • the receiving bore in the housing part of the high-pressure fuel pump is designed as a stepped bore, in which further the adapter piece of the proportional valve at least partially used, preferably pressed.
  • the seal is further optimized to the outside.
  • an axially sealing O-ring between the adapter piece and the housing part can be inserted.
  • the advantages of a high-pressure fuel pump with a proportional valve according to the invention are to be seen in particular in that the cultivation of the proportional valve is simplified.
  • the connection of the proportional valve with the high-pressure fuel pump is achieved via the collar bushing and possibly the adapter piece, which are preferably pressed into a corresponding receiving bore of the housing part of the high-pressure fuel pump.
  • With the interference fit eliminates the need for the arrangement of an additional sealing element, in particular a sealing in the radial direction O-ring. This can also go along with a refining of the components, which in turn has a favorable effect on the manufacturing costs.
  • the flanged bush and the adapter piece which replace the magnetic core, also allow a particularly compact construction in the axial direction, so that the space requirement of the high-pressure fuel pump is reduced.
  • the procedure is preferably as follows. First, the valve piston and the spring are inserted into the collar bushing. The flanged bushing including the valve piston and the spring is then pressed into the receiving bore of the housing part of the high-pressure fuel pump, the preload of the spring being predetermined via the press-in depth. At the same time any manufacturing tolerances can be compensated via the press-in depth. Subsequently, the adapter piece is pressed into the receiving bore and / or pressed onto the collar bushing. Now only the cup-shaped housing part of the proportional valve, in which the electromagnet and the armature plunger assembly are added, to be connected to the adapter piece. About the cone of the adapter piece while doing a centering.
  • the adapter piece can only be connected to the pot-shaped housing part of the proportional valve after the solenoid was used with the anchor-ram composite in the cup-shaped housing part of the proportional valve.
  • the cup-shaped housing part with the adapter piece is then placed on the collar bushing and bolted to the housing part of the high-pressure fuel pump.
  • FIG. 1 shows a schematic longitudinal section through an inventive proportional valve according to a first preferred embodiment of a high-pressure fuel pump
  • FIG. 2 shows the proportional valve of FIG. 1 during cultivation
  • Fig. 3 is a schematic longitudinal section through an inventive proportional valve according to a further preferred embodiment of a high-pressure fuel pump and
  • FIG. 4 the proportional valve of FIG. 3 during cultivation.
  • the proportional valve shown in FIG. 1 is attached to a high-pressure fuel pump.
  • the connection is made via a collar bushing 6, which is pressed into a receiving bore 16 of a housing part 10 of the high-pressure fuel pump.
  • an adapter piece 9 is placed, which is also pressed into the receiving bore 16.
  • the receiving bore 16 is designed for this purpose as a stepped bore.
  • the adapter piece 9 has a cone 11, which facilitates the placement of an electromagnet 1 for actuating the proportional valve when mounted on the high-pressure fuel pump.
  • the attachment of the electromagnet 1 takes place only after the collar bushing 6 and the adapter piece 9 have been pressed into the receiving bore 16 of the housing part 10 of the high-pressure fuel pump.
  • the electromagnet 1 is accommodated together with an armature 2 in an encapsulating cup-shaped housing part 7 of the proportional valve.
  • Housing part 7 has a flange portion 17 which rests on the outside of the housing part 10 of the high-pressure fuel pump and can be screwed to the housing part 10. With the screw connection, the proportional valve is fixed to the housing part 10 of the high-pressure fuel pump.
  • the armature 2 is designed as a plunger armature and connected to a plunger 3 for coupling with a valve piston 4, which is received in the collar bushing 6 axially displaceable.
  • the valve piston 4 has shell-side openings 13, which can be brought into coincidence with an annular groove 14 of the collar bushing 6, in the formed as radial bores inlet holes 15 open. The axial position of the valve piston 4 with respect to the annular groove 14 thus provides the flow through the valve.
  • valve piston 4 is acted upon by the spring force of a spring 5, which biases the valve piston 4 in the direction of the plunger 3 axially.
  • a ring collar 8 formed on the collar 6 serves as a stop.
  • FIGS. 3 and 4 An alternative embodiment of a proportional valve according to the invention is shown in FIGS. 3 and 4.
  • this has a flange 12 which abuts the outside of the housing part 10 of the high-pressure fuel pump.
  • the flange 12 receives the flange portion 17 of the cup-shaped housing part 7 of the proportional valve and is screwed together with this with the housing part 10 of the high-pressure fuel pump.
  • a sealing element 18 is also inserted, which causes an additional axial seal.
  • the adapter piece 9 is inexpensive to manufacture as a stamped and bent part.
  • housing part 7 and the electromagnet 1 is connected, wherein the cone 11 causes a centering. Since the armature bearing is done exclusively via the preassembled unit, the bearing testing is simplified. In addition, the adapter piece 9 optimizes the magnetic flux.

Abstract

The invention relates to a proportional valve that can be electromagnetically actuated for controlling the delivery rate of a high-pressure fuel pump, comprising an electromagnet (1) for acting on an armature (2) that can be moved in a reciprocating manner, wherein the armature (2) is coupled to an axially movable valve piston (4) by means of a tappet (3) such that the stroke of the armature (2) causes an axial movement of the valve piston (4) against the spring force of a spring (5). According to the invention, the axially movable valve piston (4) is accommodated in a flanged bush (6), by means of which the proportional valve can be connected to a housing part (7) of the high-pressure fuel pump. The invention further relates to a high-pressure fuel pump having such a proportional valve for controlling the delivery rate.

Description

Beschreibung Titel  Description title
Elektromagnetisch betätigbares Proportionalventil sowie Kraftstoffhochdruckpumpe mit einem solchen Proportionalventil  Electromagnetically actuated proportional valve and high-pressure fuel pump with such a proportional valve
Die Erfindung betrifft ein elektromagnetisch bestätigbares Proportionalventil mit den Merkmalen des Oberbegriffs des Anspruchs 1. Des Weiteren betrifft die Erfindung eine Kraftstoffhochdruckpumpe mit einem solchen Proportionalventil zur Regelung der Fördermenge. The invention relates to an electromagnetically verifiable proportional valve with the features of the preamble of claim 1. Furthermore, the invention relates to a high-pressure fuel pump with such a proportional valve for controlling the flow rate.
Stand der Technik State of the art
Aus der Offenlegungsschrift DE 10 2011 017 495 AI ist eine Zumesseinheit für eine Hochdruckpumpe eines Kraftstoffeinspritzsystems, insbesondere eines Common-Rail- Einspritzsystems, bekannt, die ein Magnetventil umfasst. Das Magnetventil besitzt einen Magnetkern mit einer zentralen Bohrung, in der ein Ventilkolben hin und her bewegbar aufgenommen ist. Der Ventilkolben weist mantelseitig angeordnete Steuerschlitze auf, die in Abhängigkeit von der axialen Lage des Ventilkolbens einen definierten Durchflussquerschnitt freigeben oder verschließen. Die axiale Lage des Ventilkolbens ist mittels eines Elektromagneten veränderbar, der hierzu mit einer Anker- Stößel- Einheit zusammenwirkt. Der Stößel dient der Kopplung des Ankers mit dem Ventilkolben und ist hierzu durch den Magnetkern geführt. Wird eine Magnetspule des Elektromagneten bestromt, bewegt sich der Anker in Richtung des Ventilkolbens. Dabei führt er den Stößel mit, der den Ventilkolben entgegen der Federkraft einer Feder, die an dem Ventilkolben abgestützt ist, axial verstellt. Die Verbindung der Zumesseinheit mit der Hochdruckpumpe erfolgt über den Magnetkern, indem dieser in eine German Offenlegungsschrift DE 10 2011 017 495 A1 discloses a metering unit for a high-pressure pump of a fuel injection system, in particular of a common-rail injection system, which comprises a solenoid valve. The solenoid valve has a magnetic core with a central bore in which a valve piston is reciprocally accommodated. The valve piston has control slots arranged on the shell side, which release or close a defined flow cross-section as a function of the axial position of the valve piston. The axial position of the valve piston is variable by means of an electromagnet, which cooperates with an armature plunger unit for this purpose. The plunger is used to couple the armature with the valve piston and is guided for this purpose by the magnetic core. If a magnetic coil of the electromagnet is energized, the armature moves in the direction of the valve piston. He leads the plunger, which axially displaces the valve piston against the spring force of a spring which is supported on the valve piston. The connection of the metering unit with the high-pressure pump via the magnetic core, by this in a
Gehäusebohrung der Hochdruckpumpe in der Weise eingesetzt wird, dass die den Ventilkolben aufnehmende Bohrung innerhalb der Gehäusebohrung zu liegen kommt. Zur Abdichtung nach außen weist der Magnetkern zwei O-Ringe auf, von denen ein erster in radialer Richtung und ein zweiter in axialer Richtung abdichtet. Zur Abdichtung nach innen ist der Magnetkern von einem dritten O-Ring umgeben, der im Bereich der Verbindung des Magnetkerns mit der Magnetspule des Elektromagneten angeordnet ist. Housing bore of the high-pressure pump is inserted in such a way that the bore receiving the valve piston comes to rest within the housing bore. For sealing to the outside, the magnetic core has two O-rings, one of which first in the radial direction and a second seals in the axial direction. For sealing inwardly of the magnetic core is surrounded by a third O-ring, which is arranged in the region of the connection of the magnetic core with the magnetic coil of the electromagnet.
Der Anbau einer solchen Zumesseinheit an eine Hochdruckpumpe erweist sich regelmäßig als problematisch. Denn in Ermangelung einer Zentriervorrichtung, die sicherstellt, dass der radial abdichtende O-Ring eine gleichmäßige Pressung erfährt, kann dieser beim Einsetzen des Magnetkerns in die Gehäusebohrung der Hochdruckpumpe leicht beschädigt werden. Bei der manuellen Montage besteht zudem die Gefahr der Partikelbildung durch den Kontakt des Magnetkerns mit dem Pumpengehäuse. Im Betrieb der Hochdruckpumpe können dann Druckpulsationen und Schwingungen zu Relativbewegungen des O-Rings gegenüber dem Magnetkern und/oder dem Pumpengehäuse und damit zu einem erhöhten Verschleiß führen. In der Folge kann es zu einem hydraulischen Bypass kommen, so dass eine korrekte Zumessung nicht mehr gewährleistet ist. The cultivation of such a metering unit to a high pressure pump proves to be a problem regularly. Because in the absence of a centering device that ensures that the radially sealing O-ring undergoes a uniform pressure, it can be easily damaged when inserting the magnetic core into the housing bore of the high-pressure pump. In manual assembly, there is also the risk of particle formation due to the contact of the magnetic core with the pump housing. During operation of the high-pressure pump, pressure pulsations and vibrations can then lead to relative movements of the O-ring relative to the magnet core and / or the pump housing and thus to increased wear. As a result, it can lead to a hydraulic bypass, so that a correct metering is no longer guaranteed.
Der vorliegenden Erfindung liegt daher die Aufgabe zugrunde, ein elektromagnetisch betätigbares Proportionalventil zur Regelung der Fördermenge einer Hochdruckpumpe anzugeben, das gegenüber den aus dem Stand der Technik bekannten Proportionalventilen robuster ist. Insbesondere soll das Proportionalventil derart an eine Kraftstoffhochdruckpumpe anbaubar sein, dass eine über die Lebensdauer zuverlässige Abdichtung nach außen gegeben ist, um die Funktionsfähigkeit des Ventils zu erhalten. The present invention is therefore an object of the invention to provide an electromagnetically actuated proportional valve for controlling the flow rate of a high-pressure pump, which is more robust compared to the known from the prior art proportional valves. In particular, the proportional valve should be attachable to a high-pressure fuel pump such that a reliable over the life seal is given to the outside to maintain the functionality of the valve.
Zur Lösung der Aufgabe wird das elektromagnetisch betätigbare Proportionalventil mit den Merkmalen des Anspruchs 1 vorgeschlagen. Vorteilhafte Weiterbildungen der Erfindung sind den Unteransprüchen zu entnehmen. Zur Lösung der Aufgabe wird ferner eine Kraftstoffhochdruckpumpe mit einem solchen Proportionalventil zur Regelung der Fördermenge angegeben. Das vorgeschlagene Proportionalventil soll insbesondere als Zumesseinheit einsetzbar sein. To solve the problem, the electromagnetically actuated proportional valve with the features of claim 1 is proposed. Advantageous developments of the invention can be found in the dependent claims. To solve the problem, a high-pressure fuel pump is further specified with such a proportional valve for controlling the flow rate. The proposed proportional valve should be used in particular as a metering unit.
Offenbarung der Erfindung Das zur Regelung der Fördermenge einer Kraftstoffhochdruckpumpe vorgeschlagene elektromagnetisch betätigbare Proportionalventil umfasst einen Elektromagneten zur Einwirkung auf einen hubbeweglichen Anker. Der Anker ist über einen Stößel mit einem axial verschiebbaren Ventilkolben gekoppelt, so dass der Hub des Ankers eine axiale Verschiebung des Ventilkolbens entgegen der Federkraft einer Feder bewirkt. Erfindungsgemäß ist der axial verschiebbare Ventilkolben in einer Bundbuchse aufgenommen, über welche das Proportionalventil mit einem Gehäuseteil der Kraftstoffhoch druckpumpe verbindbar ist. Die Bundbuchse übernimmt somit die Funktionen des Magnetkerns. Gegenüber der komplexen Form eines Magnetkerns weist die Bundbuchse eine sehr schlichte Form auf und ist somit einfach und kostengünstig zu fertigen. Ferner können der Ventilkolben und die Feder in der Bundbuchse vormontiert werden und die vormontierte Einheit kann zunächst ohne Elektromagneten in eine Auf nahmebohrung des Gehäuseteils der Kraftstoffhochdruckpumpe eingesetzt werden, was den Anbau an die Kraftstoffhochdruckpumpe vereinfacht. Die Bundbuchse als Anbaukomponente ist dann mit den übrigen Komponenten des Proportionalventils verbindbar. Disclosure of the invention The proposed for controlling the flow rate of a high-pressure fuel pump electromagnetically actuated proportional valve comprises an electromagnet for acting on a lifting armature. The armature is coupled via a plunger with an axially displaceable valve piston, so that the stroke of the armature causes an axial displacement of the valve piston against the spring force of a spring. According to the invention, the axially displaceable valve piston is received in a flanged bush, via which the proportional valve with a housing part of the high-pressure fuel pump is connected. The collar bushing thus assumes the functions of the magnetic core. Compared to the complex shape of a magnetic core, the collar bushing has a very simple form and is therefore easy and inexpensive to manufacture. Further, the valve piston and the spring can be preassembled in the flanged bushing and the preassembled unit can initially be used without electromagnet in a bore on the housing part of the high-pressure fuel pump, which simplifies the cultivation of the high-pressure fuel pump. The flanged bushing as an add-on component can then be connected to the other components of the proportional valve.
Die Bundbuchse lässt sich in einfacher Weise mittels Einpressen in eine entsprechende Aufnahmebohrung des Gehäuseteils der Kraftstoffhochdruckpumpe mit dieser verbinden. Der Presssitz der Bundbuchse in der Aufnahmebohrung macht zudem die Anordnung eines zusätzlichen Dichtelements, beispielsweise in Form eines radial abdich tenden O- Rings, entbehrlich. Damit entfällt die Gefahr einer Beschädigung des Dichtelements bei der Montage. Die Abdichtung über den Presssitz ist auch über die Lebensdauer robuster, da weniger verschleißbehaftet. The collar bushing can be connected in a simple manner by pressing into a corresponding receiving bore of the housing part of the high-pressure fuel pump with this. The interference fit of the collar bushing in the receiving bore also makes the arrangement of an additional sealing element, for example in the form of a radially sealing O-ring, dispensable. This eliminates the risk of damage to the sealing element during assembly. Sealing over the interference fit is also more robust over the service life as it is less subject to wear.
Bevorzugt besitzt die Bundbuchse einen sich nach radial innen erstreckenden Preferably, the collar bushing has a radially inwardly extending
Ringbund zur Ausbildung eines Anschlags für den Ventilkolben. Durch die vom Ringbund umschlossene Öffnung kann dann der Stößel zur Kopplung des Ankers mit dem Ventilkolben hindurch geführt werden. Die Öffnung ist vorzugsweise derart groß bemessen, dass ein ausreichendes radiales Spiel zwischen dem Stößel und dem Ringbund verbleibt, um etwaige Fertigungs- und/oder Montagetoleranzen auszugleichen. Gemäß einer bevorzugten Ausführungsform der Erfindung ist die Bundbuchse zumindest bereichsweise von einem Adapterstück umgeben, über welches die Bundbuchse mit dem Elektromagneten und/oder einem topfförmigen Gehäuseteil zur Aufnahme des Elektromagneten verbunden bzw. verbindbar ist. Die Verbindung des Adapterstücks mit der Bundbuchse kann über einen Kragen des Adapterstücks erfolgen, so dass das Adapterstück auf die Bundbuchse aufsetzbar, vorzugsweise aufpressbar ist. Ferner kann das Adapterstück über eine Pressverbindung in der Aufnahmebohrung des Gehäuseteils der Kraftstoffhochdruckpumpe gehalten sein, die hierzu bevorzugt als Stufenbohrung ausgeführt ist. Das Adapterstück selbst kann ein Stanz- Biegeteil sein, das einfach und kostengünstig herstellbar ist. Ring collar for forming a stop for the valve piston. By the enclosed by the annular collar opening then the plunger for coupling the armature with the valve piston can be passed through. The opening is preferably dimensioned such that a sufficient radial clearance between the plunger and the annular collar remains to compensate for any manufacturing and / or assembly tolerances. According to a preferred embodiment of the invention, the collar bushing is at least partially surrounded by an adapter piece, via which the collar bushing is connected to the electromagnet and / or a cup-shaped housing part for receiving the electromagnet or connectable. The connection of the adapter piece with the collar socket can be made via a collar of the adapter piece, so that the adapter piece can be placed on the collar bushing, preferably be pressed on. Further, the adapter piece may be held via a press connection in the receiving bore of the housing part of the high-pressure fuel pump, which is designed for this purpose preferably as a stepped bore. The adapter piece itself can be a stamped and bent part, which is simple and inexpensive to produce.
Beim Anbau des Proportionalventils an die Kraftstoffhochdruckpumpe kann das Adapterstück zunächst mit der Bundbuchse oder alternativ zunächst mit dem topfförmigen Gehäuseteil und/oder dem Elektromagneten verbunden werden. When mounting the proportional valve to the high-pressure fuel pump, the adapter piece can first be connected to the flanged bush or alternatively first with the cup-shaped housing part and / or the electromagnet.
Vorteilhafterweise bildet das Adapterstück einen Konus zur automatischen Zentrierung des Elektromagneten und/oder des topfförmigen Gehäuseteils beim Verbinden mit dem Adapterstück aus. Advantageously, the adapter piece forms a cone for automatically centering the electromagnet and / or the cup-shaped housing part when connecting to the adapter piece.
In Weiterbildung der Erfindung wird vorgeschlagen, dass das Adapterstück einen sich nach radial außen erstreckenden Flansch ausbildet, über welchen das Adapterstück außen am Gehäuseteil der Kraftstoffhochdruckpumpe axial anschlagbar ist. Im Flansch können Bohrungen zur Aufnahme von Schrauben vorgesehen sein, die eine Ver- schraubung des Adapterstücks mit dem Gehäuseteil ermöglichen. In a further development of the invention, it is proposed that the adapter piece forms a radially outwardly extending flange, via which the adapter piece can be abutted axially on the outside of the housing part of the high-pressure fuel pump. In the flange holes may be provided for receiving screws that allow a screw connection of the adapter piece with the housing part.
Bevorzugt besitzt der Ventilkolben mindestens eine mantelseitige Durchbrechung, die in Überdeckung mit einer als Zulauf dienenden Ringnut der Bundbuchse bringbar ist, in die mindestens eine Zulaufbohrung mündet. Die mindestens eine Zulaufbohrung ist vorzugsweise als Radialbohrung in der Bundbuchse ausgebildet. Auch in dieser Hinsicht ersetzt somit die Bundbuchse den fehlenden Magnetkern, in dem üblicherweise die Zulaufbohrungen ausgebildet sind. Preferably, the valve piston has at least one shell-side opening, which can be brought into coincidence with a serving as an inlet annular groove of the collar, into which opens at least one inlet bore. The at least one inlet bore is preferably formed as a radial bore in the collar bushing. Also in this regard, thus replacing the collar bushing the missing magnetic core, in which usually the inlet holes are formed.
Ferner wird vorgeschlagen, dass der Anker als Tauchanker ausgebildet und mit dem Stößel fest verbunden ist. Vorzugsweise ist der Stößel in den Anker eingepresst. Denn über die Einpresstiefe kann die Kennlinie des mechanischen Teils des Proportionalventils vorgegeben werden. It is also proposed that the armature is designed as a plunger anchor and firmly connected to the plunger. Preferably, the plunger is pressed into the anchor. Because The characteristic of the mechanical part of the proportional valve can be specified via the press-in depth.
Des Weiteren wird eine Kraftstoffhochdruckpumpe mit einem erfindungsgemäßen Proportionalventil vorgeschlagen. Die Kraftstoffhochdruckpumpe umfasst ein Gehäuseteil, in dem eine Aufnahmebohrung ausgebildet ist, in welche die Bundbuchse des Proportionalventils eingesetzt, vorzugsweise eingepresst, ist. Wie bereits zuvor erwähnt, ist aufgrund des Presssitzes der Bundbuchse in der Aufnahmebohrung eine Abdichtung nach außen über ein zusätzliches Dichtelement, insbesondere einen radial abdichtenden O-Ring, entbehrlich. Die Abdichtung wird allein über den Presssitz bewirkt, der gegenüber einem in die Aufnahmebohrung eingesetzten radial abdichtenden O-Ring weniger verschleißbehaftet ist. Die Gefahr eines hydraulischen Bypasses ist somit minimiert und eine korrekte Zumessung gewährleistet. Furthermore, a high-pressure fuel pump with a proportional valve according to the invention is proposed. The high-pressure fuel pump comprises a housing part, in which a receiving bore is formed, in which the collar bushing of the proportional valve is inserted, preferably pressed. As already mentioned above, due to the interference fit of the collar bushing in the receiving bore, a seal to the outside via an additional sealing element, in particular a radially sealing O-ring, is dispensable. The seal is effected solely via the interference fit, which is less subject to wear in relation to a radially sealing O-ring inserted into the receiving bore. The risk of a hydraulic bypass is thus minimized and ensures correct metering.
Bevorzugt ist die Aufnahmebohrung im Gehäuseteil der Kraftstoffhochdruckpumpe als Stufenbohrung ausgeführt, in welche ferner das Adapterstück des Proportionalventils zumindest bereichsweise eingesetzt, vorzugsweise eingepresst, ist. Durch den Presssitz des Adapterstücks in der Aufnahmebohrung wird die Abdichtung nach außen weiter optimiert. Zudem kann ein axial dichtender O-Ring zwischen dem Adapterstück und dem Gehäuseteil eingelegt werden. Preferably, the receiving bore in the housing part of the high-pressure fuel pump is designed as a stepped bore, in which further the adapter piece of the proportional valve at least partially used, preferably pressed. By the interference fit of the adapter piece in the receiving bore, the seal is further optimized to the outside. In addition, an axially sealing O-ring between the adapter piece and the housing part can be inserted.
Die Vorteile einer Kraftstoffhochdruckpumpe mit einem erfindungsgemäßen Proportionalventil sind insbesondere darin zu sehen, dass der Anbau des Proportionalventils vereinfacht wird. Die Verbindung des Proportionalventils mit der Kraftstoffhochdruckpumpe wird über die Bundbuchse und ggf. das Adapterstück erreicht, die bevorzugt in eine entsprechende Aufnahmebohrung des Gehäuseteils der Kraftstoffhochdruckpumpe eingepresst werden. Mit dem Presssitz entfällt die Notwendigkeit der Anordnung eines zusätzlichen Dichtelements, insbesondere eines in radialer Richtung dichtenden O- Rings. Damit einher kann zudem eine Entfeinerung der Bauteile gehen, die sich wiederum günstig auf die Herstellungskosten auswirkt. Die Bundbuchse und das Adapterstück, welche den Magnetkern ersetzen, erlauben zudem eine in axialer Richtung besonders kompaktbauende Anordnung, so dass der Bauraumbedarf der Kraftstoffhochdruckpumpe verringert wird. Beim Anbau eines erfindungsgemäßen Proportionalventils an eine Kraftstoffhochdruckpumpe wird vorzugsweise wie folgt vorgegangen. Zunächst werden der Ventilkolben und die Feder in die Bundbuchse eingesetzt. Die Bundbuchse einschließlich des Ventilkolbens und der Feder wird dann in die Aufnahmebohrung des Gehäuseteils der Kraftstoffhochdruckpumpe eingepresst, wobei über die Einpresstiefe die Vorspannung der Feder vorgegeben wird. Zugleich können über die Einpresstiefe etwaige Fertigungstoleranzen ausgeglichen werden. Anschließend wird das Adapterstück in die Aufnahmebohrung eingepresst und/oder auf die Bundbuchse aufgepresst. Nun muss nur noch das topfförmige Gehäuseteil des Proportionalventils, in dem der Elektromagnet und der Anker- Stößel-Verbund aufgenommen sind, mit dem Adapterstück verbunden werden. Über den Konus des Adapterstücks erfolgt dabei eine Zentrierung. The advantages of a high-pressure fuel pump with a proportional valve according to the invention are to be seen in particular in that the cultivation of the proportional valve is simplified. The connection of the proportional valve with the high-pressure fuel pump is achieved via the collar bushing and possibly the adapter piece, which are preferably pressed into a corresponding receiving bore of the housing part of the high-pressure fuel pump. With the interference fit eliminates the need for the arrangement of an additional sealing element, in particular a sealing in the radial direction O-ring. This can also go along with a refining of the components, which in turn has a favorable effect on the manufacturing costs. The flanged bush and the adapter piece, which replace the magnetic core, also allow a particularly compact construction in the axial direction, so that the space requirement of the high-pressure fuel pump is reduced. When mounting a proportional valve according to the invention to a high-pressure fuel pump, the procedure is preferably as follows. First, the valve piston and the spring are inserted into the collar bushing. The flanged bushing including the valve piston and the spring is then pressed into the receiving bore of the housing part of the high-pressure fuel pump, the preload of the spring being predetermined via the press-in depth. At the same time any manufacturing tolerances can be compensated via the press-in depth. Subsequently, the adapter piece is pressed into the receiving bore and / or pressed onto the collar bushing. Now only the cup-shaped housing part of the proportional valve, in which the electromagnet and the armature plunger assembly are added, to be connected to the adapter piece. About the cone of the adapter piece while doing a centering.
Alternativ kann das Adapterstück auch erst mit dem topfförmigen Gehäuseteil des Proportionalventils verbunden werden, nachdem der Elektromagnet mit dem Anker- Stößel- Verbund in das topfförmige Gehäuseteil des Proportionalventils eingesetzt wurde. Das topfförmige Gehäuseteil mit dem Adapterstück wird dann auf die Bundbuchse aufgesetzt und mit dem Gehäuseteil der Kraftstoffhochdruckpumpe verschraubt. Alternatively, the adapter piece can only be connected to the pot-shaped housing part of the proportional valve after the solenoid was used with the anchor-ram composite in the cup-shaped housing part of the proportional valve. The cup-shaped housing part with the adapter piece is then placed on the collar bushing and bolted to the housing part of the high-pressure fuel pump.
Bevorzugte Ausführungsformen der Erfindung werden nachfolgend anhand der beigefügten Zeichnungen näher erläutert. Diese zeigen: Preferred embodiments of the invention are explained below with reference to the accompanying drawings. These show:
Fig. 1 einen schematischen Längsschnitt durch ein erfindungsgemäßes Proportionalventil gemäß einer ersten bevorzugten Ausführungsform an einer Kraftstoffhochdruckpumpe, 1 shows a schematic longitudinal section through an inventive proportional valve according to a first preferred embodiment of a high-pressure fuel pump,
Fig. 2 das Proportionalventil der Fig. 1 während des Anbaus, FIG. 2 shows the proportional valve of FIG. 1 during cultivation; FIG.
Fig. 3 einen schematischen Längsschnitt durch ein erfindungsgemäßes Proportionalventil gemäß einer weiteren bevorzugten Ausführungsform an einer Kraftstoffhochdruckpumpe und Fig. 3 is a schematic longitudinal section through an inventive proportional valve according to a further preferred embodiment of a high-pressure fuel pump and
Fig. 4 das Proportionalventil der Fig. 3 während des Anbaus. Ausführliche Beschreibung der Zeichnungen Das in der Fig. 1 dargestellte Proportionalventil ist an eine Kraftstoffhochdruckpumpe angebaut. Die Verbindung erfolgt über eine Bundbuchse 6, die in eine Aufnahmeboh- rung 16 eines Gehäuseteils 10 der Kraftstoffhochdruckpumpe eingepresst ist. Auf die Bundbuchse 6 ist ein Adapterstück 9 aufgesetzt, das ebenfalls in die Aufnahmebohrung 16 eingepresst ist. Die Aufnahmebohrung 16 ist hierzu als Stufenbohrung ausgeführt. Das Adapterstück 9 besitzt einen Konus 11, der das Aufsetzen eines Elektromagneten 1 zur Betätigung des Proportionalventils beim Anbau an die Kraftstoffhochdruckpumpe erleichtert. Denn wie der Fig. 2 zu entnehmen ist, erfolgt der Anbau des Elektromagneten 1 erst nach dem Einpressen der Bundbuchse 6 und des Adapterstücks 9 in die Aufnahmebohrung 16 des Gehäuseteils 10 der Kraftstoffhochdruckpumpe. Fig. 4, the proportional valve of FIG. 3 during cultivation. Detailed description of the drawings The proportional valve shown in FIG. 1 is attached to a high-pressure fuel pump. The connection is made via a collar bushing 6, which is pressed into a receiving bore 16 of a housing part 10 of the high-pressure fuel pump. On the collar bushing 6, an adapter piece 9 is placed, which is also pressed into the receiving bore 16. The receiving bore 16 is designed for this purpose as a stepped bore. The adapter piece 9 has a cone 11, which facilitates the placement of an electromagnet 1 for actuating the proportional valve when mounted on the high-pressure fuel pump. As can be seen from FIG. 2, the attachment of the electromagnet 1 takes place only after the collar bushing 6 and the adapter piece 9 have been pressed into the receiving bore 16 of the housing part 10 of the high-pressure fuel pump.
Der Elektromagnet 1 ist gemeinsam mit einem Anker 2 in einem umspritzen topfförmi- gen Gehäuseteil 7 des Proportionalventils aufgenommen. Das topfförmige The electromagnet 1 is accommodated together with an armature 2 in an encapsulating cup-shaped housing part 7 of the proportional valve. The cup-shaped
Gehäuseteil 7 besitzt einen Flanschabschnitt 17, der außen am Gehäuseteil 10 der Kraftstoffhochdruckpumpe anliegt und mit dem Gehäuseteil 10 verschraubbar ist. Mit der Verschraubung ist das Proportionalventil am Gehäuseteil 10 der Kraftstoffhochdruckpumpe festgelegt. Housing part 7 has a flange portion 17 which rests on the outside of the housing part 10 of the high-pressure fuel pump and can be screwed to the housing part 10. With the screw connection, the proportional valve is fixed to the housing part 10 of the high-pressure fuel pump.
Der Anker 2 ist als Tauchanker ausgeführt und mit einem Stößel 3 zur Kopplung mit einem Ventilkolben 4 verbunden, der in der Bundbuchse 6 axial verschiebbar aufgenommen ist. Der Ventilkolben 4 besitzt mantelseitige Durchbrechungen 13, die in Überdeckung mit einer Ringnut 14 der Bundbuchse 6 bringbar sind, in die als Radialbohrungen ausgebildete Zulaufbohrungen 15 münden. Die axiale Lage des Ventilkolbens 4 in Bezug auf die Ringnut 14 gibt somit den Durchfluss durch das Ventil vor. The armature 2 is designed as a plunger armature and connected to a plunger 3 for coupling with a valve piston 4, which is received in the collar bushing 6 axially displaceable. The valve piston 4 has shell-side openings 13, which can be brought into coincidence with an annular groove 14 of the collar bushing 6, in the formed as radial bores inlet holes 15 open. The axial position of the valve piston 4 with respect to the annular groove 14 thus provides the flow through the valve.
Der Ventilkolben 4 ist von der Federkraft einer Feder 5 beaufschlagt, die den Ventilkolben 4 in Richtung des Stößels 3 axial vorspannt. Ein an der Bundbuchse 6 ausgebilde- ter Ringbund 8 dient dabei als Anschlag. The valve piston 4 is acted upon by the spring force of a spring 5, which biases the valve piston 4 in the direction of the plunger 3 axially. A ring collar 8 formed on the collar 6 serves as a stop.
Wird der Elektromagnet 1 bestromt, bewegen sich der Anker 2 und der Stößel 3 nach unten. Dabei bewirkt der am Ventilkolben 4 anliegende Stößel 3 eine axiale Verschiebung des Ventilkolbens 4 entgegen der Federkraft der Feder 5. Die axiale Lage der mantelseitigen Durchbrechungen 13 des Ventilkolbens 4 in Bezug auf die Ringnut 14 der Bundbuchse 6 ändert sich, wodurch sich in der Folge auch der Durchfluss durch das Ventil ändert. When the electromagnet 1 is energized, the armature 2 and the plunger 3 move downwards. In this case, the valve piston 4 applied on the plunger 3 causes an axial displacement of the valve piston 4 against the spring force of the spring 5. The axial position of the shell-side openings 13 of the valve piston 4 with respect to the annular groove 14 of the collar bushing 6 changes, thereby changing the flow through the valve as a result.
Im Unterschied zu bekannten Proportionalventilen sind im Bereich der Verbindung des Ventils mit dem Gehäuseteil 10 der Kraftstoffhochdruckpumpe keine zusätzlichen Dichtelemente angeordnet. Die Abdichtung nach außen wird allein über den Presssitz der Bundbuchse 6 und des Adapterstücks 9 in der Aufnahmebohrung 16 bewirkt. Die Abdichtung über den Presssitz ist weniger verschleißbehaftet als die über einen radial abdichtenden O-Ring. Zudem vereinfacht die Pressverbindung den Anbau des Proportionalventils an die Kraftstoffhochdruckpumpe (siehe Fig. 2). In contrast to known proportional valves, no additional sealing elements are arranged in the region of the connection of the valve to the housing part 10 of the high-pressure fuel pump. The seal to the outside is effected solely on the press fit of the collar bushing 6 and the adapter piece 9 in the receiving bore 16. The seal over the interference fit is less subject to wear than that via a radially sealing O-ring. In addition, the press connection simplifies the attachment of the proportional valve to the high-pressure fuel pump (see FIG. 2).
Eine alternative Ausführungsform eines erfindungsgemäßen Proportionalventils ist in den Fig. 3 und 4 dargestellt. Im Unterschied zum Proportionalventil der Fig. 1 und 2 weist dieses einen Flansch 12 auf, der außen am Gehäuseteil 10 der Kraftstoffhochdruckpumpe anliegt. Der Flansch 12 nimmt den Flanschabschnitt 17 des topfförmigen Gehäuseteils 7 des Proportionalventils auf und ist gemeinsam mit diesem mit dem Gehäuseteil 10 der Kraftstoffhochdruckpumpe verschraubbar. Zwischen einer Vertiefung 19 des Flansches 12 und dem Gehäuseteil 10 der Kraftstoffhochdruckpumpe ist zudem ein Dichtelement 18 eingelegt, das eine zusätzliche axiale Abdichtung bewirkt. Das Adapterstück 9 ist als Stanz- Biegeteil kostengünstig zu fertigen. An alternative embodiment of a proportional valve according to the invention is shown in FIGS. 3 and 4. In contrast to the proportional valve of FIGS. 1 and 2, this has a flange 12 which abuts the outside of the housing part 10 of the high-pressure fuel pump. The flange 12 receives the flange portion 17 of the cup-shaped housing part 7 of the proportional valve and is screwed together with this with the housing part 10 of the high-pressure fuel pump. Between a recess 19 of the flange 12 and the housing part 10 of the high-pressure fuel pump, a sealing element 18 is also inserted, which causes an additional axial seal. The adapter piece 9 is inexpensive to manufacture as a stamped and bent part.
Wie der Fig. 4 zu entnehmen ist, wird beim Anbau des Proportionalventils an die Kraftstoffhochdruckpumpe das Adapterstück 9 zunächst mit dem topfförmigen As can be seen from FIG. 4, when the proportional valve is fitted to the high-pressure fuel pump, the adapter piece 9 is first of cup-shaped
Gehäuseteil 7 und dem Elektromagneten 1 verbunden, wobei der Konus 11 eine Zentrierung bewirkt. Da die Ankerlagerung ausschließlich über die vormontierte Einheit erfolgt, wird die Lagererprobung vereinfacht. Zudem optimiert das Adapterstück 9 den Magnetfluss. Housing part 7 and the electromagnet 1 is connected, wherein the cone 11 causes a centering. Since the armature bearing is done exclusively via the preassembled unit, the bearing testing is simplified. In addition, the adapter piece 9 optimizes the magnetic flux.

Claims

Ansprüche claims
1. Elektromagnetisch betätigbares Proportionalventil zur Regelung der Fördermenge einer Kraftstoffhochdruckpumpe, umfassend einen Elektromagneten (1) zur Einwirkung auf einen hubbeweglichen Anker (2), wobei der Anker (2) über einen Stößel (3) mit einem axial verschiebbaren Ventilkolben (4) gekoppelt ist, so dass der Hub des Ankers (2) eine axiale Verschiebung des Ventilkolbens (4) entgegen der Federkraft einer Feder (5) bewirkt, 1. Electromagnetically actuated proportional valve for controlling the flow rate of a high-pressure fuel pump, comprising an electromagnet (1) for acting on a liftable armature (2), wherein the armature (2) via a plunger (3) with an axially displaceable valve piston (4) is coupled in that the stroke of the armature (2) causes an axial displacement of the valve piston (4) against the spring force of a spring (5),
dadurch gekennzeichnet, dass der axial verschiebbare Ventilkolben (4) in einer Bundbuchse (6) aufgenommen ist, über welche das Proportionalventil mit einem Gehäuseteil (7) der Kraftstoffhochdruckpumpe verbindbar ist. characterized in that the axially displaceable valve piston (4) in a collar bushing (6) is received, via which the proportional valve with a housing part (7) of the high-pressure fuel pump is connectable.
2. Proportionalventil nach Anspruch 1, 2. Proportional valve according to claim 1,
dadurch gekennzeichnet, dass die Bundbuchse (6) einen sich nach radial innen erstreckenden Ringbund (8) zur Ausbildung eines Anschlags für den Ventilkolben (4) besitzt. characterized in that the collar bush (6) has a radially inwardly extending annular collar (8) for forming a stop for the valve piston (4).
3. Proportionalventil nach Anspruch 1 oder 2, 3. Proportional valve according to claim 1 or 2,
dadurch gekennzeichnet, dass die Bundbuchse (6) zumindest bereichsweise von einem Adapterstück (9) umgeben ist, über welches die Bundbuchse (6) mit dem Elektromagneten (1) und/oder einem topfförmigen Gehäuseteil (10) zur Aufnahme des Elektromagneten (1) verbunden oder verbindbar ist. characterized in that the flanged bush (6) is at least partially surrounded by an adapter piece (9), via which the flanged bush (6) with the electromagnet (1) and / or a cup-shaped housing part (10) for receiving the electromagnet (1) or connectable.
4. Proportionalventil nach Anspruch 3, 4. Proportional valve according to claim 3,
dadurch gekennzeichnet, dass das Adapterstück (9) einen Konus (11) zur automatischen Zentrierung des Elektromagneten (1) und/oder des topfförmigen characterized in that the adapter piece (9) has a cone (11) for automatically centering the electromagnet (1) and / or the cup-shaped
Gehäuseteils (10) beim Verbinden mit dem Adapterstück (9) ausbildet. Housing part (10) when connecting with the adapter piece (9) is formed.
5. Proportionalventil nach Anspruch 3 oder 4, 5. Proportional valve according to claim 3 or 4,
dadurch gekennzeichnet, dass das Adapterstück (9) einen sich nach radial außen erstreckenden Flansch (12) ausbildet, über welchen das Adapterstück (9) außen am Gehäuseteil (7) der Kraftstoffhochdruckpumpe axial anschlagbar ist. characterized in that the adapter piece (9) forms a radially outwardly extending flange (12) through which the adapter piece (9) on the outside of the housing part (7) of the high-pressure fuel pump is axially abuttable.
6. Proportionalventil nach einem der vorhergehenden Ansprüche, 6. Proportional valve according to one of the preceding claims,
dadurch gekennzeichnet, dass der Ventilkolben (4) mindestens eine mantelseitige Durchbrechung (13) besitzt, die in Überdeckung mit einer als Zulauf dienenden Ringnut (14) der Bundbuchse (6) bringbar ist, in die mindestens eine Zulaufboh- rung (15) mündet, die vorzugsweise als Radialbohrung in der Bundbuchse (6) ausgebildet ist. characterized in that the valve piston (4) has at least one shell-side opening (13) which can be brought into coincidence with an annular groove (14) of the collar bush (6) serving as an inlet into which at least one inlet bore (15) opens, which is preferably formed as a radial bore in the collar bushing (6).
7. Proportionalventil nach einem der vorhergehenden Ansprüche, 7. Proportional valve according to one of the preceding claims,
dadurch gekennzeichnet, dass der Anker (2) als Tauchanker ausgebildet und mit dem Stößel (3) fest verbunden ist. characterized in that the armature (2) is designed as a plunger anchor and firmly connected to the plunger (3).
8. Kraftstoffhochdruckpumpe mit einem Proportionalventil nach einem der vorhergehenden Ansprüche, 8. High-pressure fuel pump with a proportional valve according to one of the preceding claims,
dadurch gekennzeichnet, dass in einem Gehäuseteil (7) der Kraftstoffhochdruckpumpe eine Aufnahmebohrung (16) ausgebildet ist, in welche die Bundbuchse (6) des Proportionalventils eingesetzt, vorzugsweise eingepresst, ist. characterized in that in a housing part (7) of the high-pressure fuel pump, a receiving bore (16) is formed, in which the collar bushing (6) of the proportional valve used, preferably pressed.
9. Kraftstoffhochdruckpumpe nach Anspruch 8, 9. high-pressure fuel pump according to claim 8,
dadurch gekennzeichnet, dass die Aufnahmebohrung (16) als Stufenbohrung ausgeführt ist, in welche ferner das Adapterstück (9) des Proportionalventils zumindest bereichsweise eingesetzt, vorzugsweise eingepresst, ist. characterized in that the receiving bore (16) is designed as a stepped bore, in which further the adapter piece (9) of the proportional valve at least partially inserted, preferably pressed, is.
PCT/EP2015/071832 2014-10-07 2015-09-23 Proportional valve that can be electromagnetically actuated and high-pressure fuel pump having such a proportional valve WO2016055268A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP15771905.5A EP3204630A1 (en) 2014-10-07 2015-09-23 Proportional valve that can be electromagnetically actuated and high-pressure fuel pump having such a proportional valve
CN201580054347.7A CN107110094A (en) 2014-10-07 2015-09-23 Can solenoid-operated proportioning valve and the high-pressure fuel pump with such proportioning valve
KR1020177011726A KR20170066514A (en) 2014-10-07 2015-09-23 Proportional valve that can be electromagnetically actuated and high-pressure fuel pump having such a proportional valve

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014220226.4 2014-10-07
DE102014220226.4A DE102014220226A1 (en) 2014-10-07 2014-10-07 Electromagnetically actuated proportional valve and high-pressure fuel pump with such a proportional valve

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CN106762301A (en) * 2017-01-22 2017-05-31 无锡威孚高科技集团股份有限公司 The split type proportional flow control valve of diesel oil high voltage common rail pump

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DE102017210355A1 (en) * 2017-06-21 2018-12-27 Robert Bosch Gmbh Proportional valve for controlling a gaseous medium
DE102019131537B4 (en) 2019-11-21 2022-01-27 Kendrion (Villingen) Gmbh Device for pressure regulation in a fuel supply of an internal combustion engine with a common rail injection

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DE102007052224A1 (en) * 2007-10-31 2009-05-07 Robert Bosch Gmbh Volume control valve device for use in high pressure fuel pump, has pot-shaped magnetic flux housing including frame-like bracket element that encloses coil arrangement at opposite front sides, where bracket element is formed from plate
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CN106762301A (en) * 2017-01-22 2017-05-31 无锡威孚高科技集团股份有限公司 The split type proportional flow control valve of diesel oil high voltage common rail pump

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KR20170066514A (en) 2017-06-14

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