WO2018033278A1 - Electromagnetically actuatable suction valve and high-pressure fuel pump - Google Patents

Electromagnetically actuatable suction valve and high-pressure fuel pump Download PDF

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Publication number
WO2018033278A1
WO2018033278A1 PCT/EP2017/065202 EP2017065202W WO2018033278A1 WO 2018033278 A1 WO2018033278 A1 WO 2018033278A1 EP 2017065202 W EP2017065202 W EP 2017065202W WO 2018033278 A1 WO2018033278 A1 WO 2018033278A1
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WO
WIPO (PCT)
Prior art keywords
suction valve
sealing element
fuel pump
annular sealing
pressure fuel
Prior art date
Application number
PCT/EP2017/065202
Other languages
German (de)
French (fr)
Inventor
Christian Langenbach
Klaus Wuerth
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2018033278A1 publication Critical patent/WO2018033278A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
    • F02M59/366—Valves being actuated electrically
    • F02M59/368—Pump inlet valves being closed when actuated
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/108—Valves characterised by the material
    • F04B53/1082—Valves characterised by the material magnetic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B7/00—Piston machines or pumps characterised by having positively-driven valving
    • F04B7/0076—Piston machines or pumps characterised by having positively-driven valving the members being actuated by electro-magnetic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/02—Construction of housing; Use of materials therefor of lift valves
    • F16K27/029—Electromagnetically actuated valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
    • F16K31/0686—Braking, pressure equilibration, shock absorbing
    • F16K31/0693—Pressure equilibration of the armature
    • 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
    • F02M2200/8076—Fuel injection apparatus manufacture, repair or assembly involving threaded members
    • 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
    • F02M2200/9015—Elastomeric or plastic materials

Definitions

  • Electromagnetically Operated Suction Valve and High-pressure Fuel Pump The invention relates to an electromagnetically actuated suction valve for a
  • High-pressure fuel pump with the features of the preamble of claim 1.
  • the proposed solenoid-operated suction valve is used to supply a high-pressure fuel pump with fuel.
  • the invention therefore further relates to a high-pressure fuel pump with such a suction valve.
  • an electromagnetically actuated suction valve for filling a high-pressure element space of a high-pressure pump with fuel which is integrated in such a way in a housing part of the high-pressure pump, that the housing part a guide and a valve seat for a valve piston of the suction valve formed.
  • the housing part After assembly of the valve piston therefore only a magnetic part of the suction valve must be connected to the housing part of the high-pressure pump.
  • the connection of the magnetic part takes place via a magnetic sleeve formed as a deep-drawn part, which is an annular
  • Magnetic coil for acting on an armature can be coupled to the valve piston surrounds.
  • an end portion of the magnet sleeve is slipped over a collar of the housing part of the high-pressure pump and deformed such that the end portion engages in a circumferential annular groove of the collar.
  • a sealing ring is inserted between the collar of the housing part and the valve part of the suction valve.
  • the present invention is based on the object, an electromagnetically actuated suction valve for a high-pressure fuel pump with an improved specify the sealing concept.
  • the suction valve should be easy to attach to a housing part of the high-pressure fuel pump.
  • the electromagnetically actuated suction valve proposed for a high-pressure fuel pump comprises an annular magnet coil for acting on an armature which can be coupled to a valve tappet and which is received in a lift-movable manner at least in sections in a central recess of a valve body.
  • a magnetic coil surrounding the magnetic coil is at least partially axially supported, which has a radially outwardly extending collar for receiving a clamping nut, by means of which the suction valve to the high-pressure pump can be fixed.
  • an annular sealing element is arranged on the magnet sleeve directly adjacent to the collar.
  • the sealing element serves to seal the suction valve to the outside, wherein the position of the sealing element is selected such that after fixing the suction valve by means of a clamping nut on the high-pressure pump neither on the threaded portion of the clamping nut on the support region of the clamping nut on the collar of the magnet sleeve moisture inside of the suction valve is able to advance.
  • a clamping nut on the high-pressure pump neither on the threaded portion of the clamping nut on the support region of the clamping nut on the collar of the magnet sleeve moisture inside of the suction valve is able to advance.
  • the annular sealing element is preferably made of an elastically deformable
  • the sealing element Due to the elastic deformability of the material, the sealing element can be biased in the axial and / or radial direction. The bias increases the sealing force, so that the sealing effect is improved. Furthermore, by means of an elastically deformable sealing element manufacturing tolerances and / or assembly tolerances can be compensated in a simple manner. Particularly preferably, the sealing element made of polytetrafluoroethylene (PTFE), silicone or fluorocarbon rubber (FKM) is made. These materials are not only elastically deformable, but also have a certain "hardness", which prevents the sealing element from being cut during assembly of the suction valve.
  • PTFE polytetrafluoroethylene
  • FKM fluorocarbon rubber
  • the annular sealing element has a cross-sectional shape which is mirror-symmetrical about at least one axis.
  • the sealing element is mirrored about an axis which is perpendicular to the longitudinal axis of the magnet sleeve.
  • the sealing element may have a substantially rectangular cross-section.
  • the annular sealing element has at least one rounded or chamfered edge. Preferably, all edges are rounded or beveled. This ensures that the sealing element does not collide with curves and / or bevels, which are possibly formed on the components surrounding the sealing element. This applies in particular to a sealing element which has a substantially rectangular cross-section.
  • the annular sealing element has at least one constriction.
  • Two constrictions are preferably located opposite the sealing element, so that in each case a constriction is formed on the inside and outside circumference and / or on the two end faces.
  • the constrictions facilitate the required elastic deformation of the sealing element, so that a better sealing effect can be realized.
  • the deformation is preferably achieved during assembly of the suction valve.
  • the annular sealing element bears against the magnet sleeve under radial prestressing. This means that the sealing element is already preloaded radially before mounting the suction valve. The radial bias holds the sealing element captive on the magnet sleeve.
  • a high-pressure fuel pump for a fuel injection system with a suction valve according to the invention and a clamping nut is also proposed.
  • the suction valve is fixed to a cylinder head of the high-pressure fuel pump.
  • the clamping nut has a collar portion for axial support on the collar of the magnet sleeve and a threaded portion for screwing with a mating thread on the high-pressure pump.
  • the clamping nut comes to lie on the side facing away from the sealing element of the collar of the magnet sleeve, so that the axial bias of the annular sealing element is effected via the tightening force of the clamping nut.
  • the axial prestressing should ensure sufficient compression of the sealing element over the occurring tolerance layers.
  • the clamping nut is preferably screwed onto a collar portion of the cylinder head.
  • the collar portion of the cylinder head is for this purpose preferably provided with an external thread which is adapted to the internal thread of the clamping nut and vice versa.
  • the collar section facilitates installation.
  • the annular sealing element is preferably clamped axially with the suction valve mounted between the collar of the magnet sleeve and an end face of the collar portion of the cylinder head. This means that moisture can not pass from the outside either behind the magnetic sleeve of the suction valve, or behind the collar portion of the cylinder head of the high-pressure pump.
  • the axially clamped sealing element is at the same time radially deformed in such a way that it bears against a radial prestress on both the magnet sleeve and the clamping nut. In this way, the sealing effect is further optimized.
  • the annular sealing element is further radially clamped between the clamping nut and the magnet sleeve.
  • FIG. 1 shows a schematic longitudinal section through an inventive suction valve, which is integrated in a high-pressure fuel pump, and
  • FIGS. 2-9 each show a schematic cross section through an annular sealing element for a suction valve according to the invention.
  • the electromagnetically actuated intake valve 1 shown in FIG. 1 serves to supply a high-pressure fuel pump 2 with fuel.
  • the suction valve 1 is for this purpose integrated into a cylinder head 14 of the high-pressure fuel pump 2, in such a way that a valve stem 4 of the intake valve 1 is guided in a liftable manner via a bore 21 formed in the cylinder head 14.
  • the bore 21 opens via a valve seat 23 into a high-pressure element space 20 of the high-pressure fuel pump 2, so that when the suction valve 1 is open, fuel flows from a low-pressure space 24 via inlet bores 25 and the valve seat 23 into the high-pressure element space 20.
  • valve stem 4 is acted upon in the closing direction by the spring force of a valve spring 22, so that the spring force of the valve spring 22 pulls the valve stem 4 into the valve seat 23.
  • another spring 26 is provided whose spring force is greater than that of the valve spring 22.
  • the further spring 26 is supported on the one hand on an armature 5, on the other hand on a pole core 17 which defines a working air gap 18 together with the armature 5. If there remains a magnetic coil 3 provided for acting on the armature 5 without being energized, the spring force of the spring 26 keeps the suction valve 1 open. To close the suction valve 1, the magnetic coil 3 is energized.
  • a magnetic field is formed whose magnetic force pulls the armature 5 in the direction of the pole core 17 in order to close the working air gap 18 formed between the pole core 17 and the armature 5.
  • the armature 5 is embodied as a plunger armature and accommodated in a central recess 6 of a valve body 7, which is inserted in sections into the cylinder head 14 of the high-pressure fuel pump 2.
  • the valve body 7 is fixedly connected to the pole core 17 via a sleeve 19.
  • the sleeve 19 is welded to the valve body 7 and the pole core 17 for this purpose.
  • a magnetic sleeve 8 is supported, which surrounds the magnetic coil 3 at least in sections.
  • a collar 9 is formed, which extends radially outward and the support of a collar portion 27 of a clamping nut 10 is used, by means of which the suction valve 1 is fixed to the cylinder head 14 of the high-pressure fuel pump 2.
  • the cylinder head 14 has for this purpose a collar portion 15, with which the clamping nut 10 is screwed by a threaded portion 28.
  • annular sealing element 11 is arranged on the magnet sleeve 8 below the collar 9, which when screwing the clamping nut 10 with the collar portion 15th the cylinder head 14 between the collar 9 and an end face 16 of the collar portion 15 is axially clamped.
  • the sealing element 11 deforms, so that it is preferably clamped radially at the same time in order to optimize the sealing effect.
  • the degree of deformation of the sealing element depends on the one hand on the axial biasing force, on the other hand on the cross-sectional shape of the sealing element. In the embodiment shown in Fig. 1, the sealing element 11 has a rectangular cross-section.
  • FIGS. 2 to 9 Advantageous cross-sectional shape variants are shown in FIGS. 2 to 9.
  • FIG. 2 shows an annular sealing element 11 with a substantially rectangular cross-sectional shape, which moreover has rounded edges 12.
  • the sealing element 11 may also have chamfered edges 12. Corresponding embodiments are shown in FIGS.
  • a cross-sectional shape with at least one constriction 13 which may be on the outer peripheral side (see FIG. 5), on the inner peripheral side (see FIG. 6) or on both the outer and inner peripheral sides (see FIG. 7).
  • constrictions 13 arranged on the front side can be provided.
  • the at least one constriction 13 improves the deformability of the sealing element 11 when an axial prestressing force is applied via the clamping nut 10. This leads to a deformation in the radial direction, so that at the same time a radial sealing effect can be achieved.

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

Abstract

The invention relates to an electromagnetically controllable suction valve (1) for a high-pressure fuel pump (2), comprising an annular magnet coil (3) for acting on an armature (5) that can be coupled to a valve tappet (4), said armature being received at least in sections in a central recess (6) of a valve body (7) in a reciprocating manner, where a magnet sleeve (8) surrounding the magnet coil (3) at least in sections is axially supported on the valve body (7), said magnet sleeve comprising a radially outwardly extending collar (9) for receiving a retaining nut (10), by means of which the suction valve (1) can be fixed to the high-pressure pump (2). According to the invention, an annular sealing element (11) is arranged on the magnet sleeve (8), directly on the collar (9). The invention also relates to a high-pressure fuel pump (2) comprising such a suction valve (1).

Description

Beschreibung  description
Titel title
Elektromagnetisch betätigbares Saugventil und Kraftstoff-Hochdruckpumpe Die Erfindung betrifft ein elektromagnetisch betätigbares Saugventil für eine Electromagnetically Operated Suction Valve and High-pressure Fuel Pump The invention relates to an electromagnetically actuated suction valve for a
Kraftstoff-Hochdruckpumpe mit den Merkmalen des Oberbegriffs des Anspruchs 1. Das vorgeschlagene elektromagnetisch betätigbare Saugventil dient der Versorgung einer Kraftstoff-Hochdruckpumpe mit Kraftstoff. Die Erfindung betrifft daher ferner eine Kraftstoff-Hochdruckpumpe mit einem solchen Saugventil. High-pressure fuel pump with the features of the preamble of claim 1. The proposed solenoid-operated suction valve is used to supply a high-pressure fuel pump with fuel. The invention therefore further relates to a high-pressure fuel pump with such a suction valve.
Stand der Technik State of the art
Aus der DE 10 2014 220 757 AI geht ein elektromagnetisch betätigbares Saugventil zur Befüllung eines Hochdruck-Elementraums einer Hochdruckpumpe mit Kraftstoff hervor, das in der Weise in ein Gehäuseteil der Hochdruckpumpe integriert ist, dass das Gehäuseteil eine Führung und einen Ventilsitz für einen Ventilkolben des Saugventils ausbildet. Nach der Montage des Ventilkolbens muss demnach nur noch ein Magnetteil des Saugventils mit dem Gehäuseteil der Hochdruckpumpe verbunden werden. Die Verbindung des Magnetteils erfolgt dabei über eine als Tiefziehteil ausgebildete Magnethülse, die eine ringförmigeFrom DE 10 2014 220 757 AI, an electromagnetically actuated suction valve for filling a high-pressure element space of a high-pressure pump with fuel, which is integrated in such a way in a housing part of the high-pressure pump, that the housing part a guide and a valve seat for a valve piston of the suction valve formed. After assembly of the valve piston therefore only a magnetic part of the suction valve must be connected to the housing part of the high-pressure pump. The connection of the magnetic part takes place via a magnetic sleeve formed as a deep-drawn part, which is an annular
Magnetspule zur Einwirkung auf einen mit dem Ventilkolben koppelbaren Anker umgibt. Hierbei wird ein Endabschnitt der Magnethülse über einen Kragen des Gehäuseteils der Hochdruckpumpe gestülpt und derart verformt, dass der Endabschnitt in eine umlaufende Ringnut des Kragens eingreift. Um zu verhindern, dass von außen Feuchtigkeit in das Saugventil eindringt, ist zwischen dem Kragen des Gehäuseteils und dem Ventilteil des Saugventils ein Dichtring eingelegt. Magnetic coil for acting on an armature can be coupled to the valve piston surrounds. Here, an end portion of the magnet sleeve is slipped over a collar of the housing part of the high-pressure pump and deformed such that the end portion engages in a circumferential annular groove of the collar. In order to prevent moisture from penetrating into the suction valve from the outside, a sealing ring is inserted between the collar of the housing part and the valve part of the suction valve.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, ein elektromagnetisch betätigbares Saugventil für eine Kraftstoff-Hochdruckpumpe mit einem verbes- serten Dichtkonzept anzugeben. Zugleich soll das Saugventil leicht an einem Gehäuseteil der Kraftstoff-Hochdruckpumpe zu befestigen sein. The present invention is based on the object, an electromagnetically actuated suction valve for a high-pressure fuel pump with an improved specify the sealing concept. At the same time, the suction valve should be easy to attach to a housing part of the high-pressure fuel pump.
Zur Lösung der Aufgabe wird das elektromagnetisch betätigbare Saugventil mit den Merkmalen des Anspruchs 1 vorgeschlagen. Vorteilhafte Weiterbildungen der Erfindung sind den Unteransprüchen zu entnehmen. Ferner wird eine Kraftstoff-Hochdruckpumpe mit einem solchen Saugventil angegeben. To solve the problem, the electromagnetically actuated suction valve with the features of claim 1 is proposed. Advantageous developments of the invention can be found in the dependent claims. Furthermore, a high-pressure fuel pump is specified with such a suction valve.
Offenbarung der Erfindung Disclosure of the invention
Das für eine Kraftstoff-Hochdruckpumpe vorgeschlagene elektromagnetisch betätigbare Saugventil umfasst eine ringförmige Magnetspule zur Einwirkung auf einen mit einem Ventilstößel koppelbaren Anker, der zumindest abschnittsweise in einer zentralen Ausnehmung eines Ventilkörpers hubbeweglich aufgenommen ist. Am Ventilkörper ist eine die Magnetspule zumindest abschnittsweise umgebende Magnethülse axial abgestützt, die einen sich nach radial außen erstreckenden Bund zur Aufnahme einer Spannmutter besitzt, mittels welcher das Saugventil an der Hochdruckpumpe fixierbar ist. Erfindungsgemäß ist unmittelbar am Bund anliegend ein ringförmiges Dichtelement auf der Magnethülse angeord- net. Das Dichtelement dient der Abdichtung des Saugventils nach außen, wobei die Lage des Dichtelements derart gewählt ist, dass nach der Fixierung des Saugventils mittels einer Spannmutter an der Hochdruckpumpe weder über den Gewindebereich der Spannmutter noch über den Abstützbereich der Spannmutter am Bund der Magnethülse Feuchtigkeit ins Innere des Saugventils vorzudrin- gen vermag. Bereits mit nur einem ringförmigen Dichtelement sind somit die imThe electromagnetically actuated suction valve proposed for a high-pressure fuel pump comprises an annular magnet coil for acting on an armature which can be coupled to a valve tappet and which is received in a lift-movable manner at least in sections in a central recess of a valve body. On the valve body, a magnetic coil surrounding the magnetic coil is at least partially axially supported, which has a radially outwardly extending collar for receiving a clamping nut, by means of which the suction valve to the high-pressure pump can be fixed. According to the invention, an annular sealing element is arranged on the magnet sleeve directly adjacent to the collar. The sealing element serves to seal the suction valve to the outside, wherein the position of the sealing element is selected such that after fixing the suction valve by means of a clamping nut on the high-pressure pump neither on the threaded portion of the clamping nut on the support region of the clamping nut on the collar of the magnet sleeve moisture inside of the suction valve is able to advance. Already with only one annular sealing element are thus in the
Inneren des Saugventils angeordneten Komponenten besser vor Feuchtigkeit geschützt. In der Folge sinkt die Gefahr von Fehlfunktionen, die auf eindringende Feuchtigkeit zurückzuführen sind. Das ringförmige Dichtelement ist bevorzugt aus einem elastisch verformbarenInside the suction valve arranged components better protected from moisture. As a result, the risk of malfunction due to moisture penetrating decreases. The annular sealing element is preferably made of an elastically deformable
Werkstoff gefertigt. Durch die elastische Verformbarkeit des Werkstoffs kann das Dichtelement in axialer und/oder radialer Richtung vorgespannt werden. Die Vorspannung erhöht die Dichtkraft, so dass die Dichtwirkung verbessert wird. Ferner können mittels eines elastisch verformbaren Dichtelements in einfacher Weise fertigungs- und/oder montagebedingte Toleranzen ausgeglichen werden. Besonders bevorzugt ist das Dichtelement aus Polytetrafluorethylen (PTFE), Silikon oder Fluorkarbon-Kautschuk (FKM) gefertigt. Diese Werkstoffe sind nicht nur elastisch verformbar, sondern weisen zudem eine gewisse„Härte" auf, die ver- hindert, dass das Dichtelement bei der Montage des Saugventils zerschnitten wird. Material manufactured. Due to the elastic deformability of the material, the sealing element can be biased in the axial and / or radial direction. The bias increases the sealing force, so that the sealing effect is improved. Furthermore, by means of an elastically deformable sealing element manufacturing tolerances and / or assembly tolerances can be compensated in a simple manner. Particularly preferably, the sealing element made of polytetrafluoroethylene (PTFE), silicone or fluorocarbon rubber (FKM) is made. These materials are not only elastically deformable, but also have a certain "hardness", which prevents the sealing element from being cut during assembly of the suction valve.
Vorteilhafterweise besitzt das ringförmige Dichtelement eine Querschnittsform, die um mindestens eine Achse spiegelsymmetrisch ist. Vorzugsweise ist das Dichtelement um eine Achse gespiegelt, die senkrecht zur Längsachse der Magnethülse verläuft. In diesem Fall ist keine gerichtete Montage des Dichtelements erforderlich, so dass die Montage vereinfacht wird. Beispielsweise kann das Dichtelement einen im Wesentlichen rechteckigen Querschnitt aufweisen. Ferner wird vorgeschlagen, dass das ringförmige Dichtelement mindestens eine gerundete oder gefaste Kante aufweist. Vorzugsweise sind alle Kanten gerundet oder gefast. Dadurch ist sichergestellt, dass das Dichtelement nicht mit Rundungen und/oder Fasen kollidiert, die ggf. an den das Dichtelement umgebenden Bauteilen ausgebildet sind. Dies gilt insbesondere bei einem Dichtelement, das einen im Wesentlichen rechteckigen Querschnitt besitzt. Advantageously, the annular sealing element has a cross-sectional shape which is mirror-symmetrical about at least one axis. Preferably, the sealing element is mirrored about an axis which is perpendicular to the longitudinal axis of the magnet sleeve. In this case, no directional mounting of the sealing element is required, so that the assembly is simplified. For example, the sealing element may have a substantially rectangular cross-section. It is also proposed that the annular sealing element has at least one rounded or chamfered edge. Preferably, all edges are rounded or beveled. This ensures that the sealing element does not collide with curves and / or bevels, which are possibly formed on the components surrounding the sealing element. This applies in particular to a sealing element which has a substantially rectangular cross-section.
Alternativ oder ergänzend wird vorgeschlagen, dass das ringförmige Dichtelement mindestens eine Einschnürung aufweist. Vorzugsweise liegen sich zwei Einschnürungen am Dichtelement gegenüber, so dass innen- und außenumfang- seitig und/oder an den beiden Stirnflächen jeweils eine Einschnürung ausgebildet ist. Die Einschnürungen erleichtern die erforderliche elastische Verformung des Dichtelements, so dass eine bessere Dichtwirkung realisierbar ist. Die Verformung wird vorzugsweise bei der Montage des Saugventils erreicht. Vorteilhafterweise liegt das ringförmige Dichtelement unter einer radialen Vorspannung an der Magnethülse an. Das heißt, dass das Dichtelement bereits vor der Montage des Saugventils radial vorgespannt ist. Die radiale Vorspannung hält das Dichtelement verliersicher auf der Magnethülse. Zudem ist sichergestellt, dass das Dichtelement seine Lage beibehält, wenn das Saugventil mittels der Spannmutter an der Hochdruckpumpe befestigt wird. Zur Lösung der eingangs genannten Aufgabe wird ferner eine Kraftstoff- Hochdruckpumpe für ein Kraftstoffeinspritzsystem mit einem erfindungsgemäßen Saugventil und einer Spannmutter vorgeschlagen. Mittels der Spannmutter ist das Saugventil an einem Zylinderkopf der Kraftstoff-Hochdruckpumpe fixiert. Die Spannmutter weist einen Bundabschnitt zur axialen Abstützung am Bund der Magnethülse sowie einen Gewindeabschnitt zur Verschraubung mit einem Gegengewinde an der Hochdruckpumpe auf. Die Spannmutter kommt dabei an der dem Dichtelement abgewandten Seite des Bunds der Magnethülse zu liegen, so dass über die Anzugskraft der Spannmutter die axiale Vorspannung des ringförmigen Dichtelements bewirkt wird. Die axiale Vorspannung sollte eine ausreichende Verpressung des Dichtelements über die auftretenden Toleranzlagen hinweg sicherstellen. Alternatively or additionally, it is proposed that the annular sealing element has at least one constriction. Two constrictions are preferably located opposite the sealing element, so that in each case a constriction is formed on the inside and outside circumference and / or on the two end faces. The constrictions facilitate the required elastic deformation of the sealing element, so that a better sealing effect can be realized. The deformation is preferably achieved during assembly of the suction valve. Advantageously, the annular sealing element bears against the magnet sleeve under radial prestressing. This means that the sealing element is already preloaded radially before mounting the suction valve. The radial bias holds the sealing element captive on the magnet sleeve. In addition, it is ensured that the sealing element maintains its position when the suction valve is fastened by means of the clamping nut on the high pressure pump. To solve the object mentioned above, a high-pressure fuel pump for a fuel injection system with a suction valve according to the invention and a clamping nut is also proposed. By means of the clamping nut, the suction valve is fixed to a cylinder head of the high-pressure fuel pump. The clamping nut has a collar portion for axial support on the collar of the magnet sleeve and a threaded portion for screwing with a mating thread on the high-pressure pump. The clamping nut comes to lie on the side facing away from the sealing element of the collar of the magnet sleeve, so that the axial bias of the annular sealing element is effected via the tightening force of the clamping nut. The axial prestressing should ensure sufficient compression of the sealing element over the occurring tolerance layers.
Die Befestigung eines Saugventils an einem Zylinderkopf einer Kraftstoff- Hochdruckpumpe mittels einer Spannmutter ist grundsätzlich bekannt. Allerdings reichen die über die Spannmutter erzielbaren Anzugskräfte nicht aus, um die erforderliche Abdichtung sicherzustellen. Dies gilt insbesondere für den Bereich der Abstützung der Spannhülse am Saugventil, wo in der Regel zwei ebene Flächen aufeinanderliegen. Durch Einsatz des erfindungsgemäßen Saugventils, das eine Magnethülse mit einem außen aufgesetzten ringförmigen Dichtelement umfasst, kann eine Abdichtung erreicht werden, die ein Eindringen von Feuchtigkeit in das Saugventil wirksam verhindert. Das ringförmige Dichtelement ist einfach und kostengünstig herzustellen und zudem einfach zu montieren. Ferner erfordert der Einsatz des ringförmigen Dichtelements keine oder zumindest keine großen konstruktiven Änderungen am Saugventil selbst, so dass sich das vorgeschlagene Dichtkonzept einfach und kostengünstig umsetzen lässt. The attachment of a suction valve to a cylinder head of a high-pressure fuel pump by means of a clamping nut is known in principle. However, the recoverable over the clamping nut tightening forces are not sufficient to ensure the required seal. This is especially true for the area of support of the clamping sleeve on the suction valve, where usually two flat surfaces lie on one another. By using the suction valve according to the invention, which comprises a magnetic sleeve with an externally mounted annular sealing element, a seal can be achieved, which effectively prevents ingress of moisture into the suction valve. The annular sealing element is simple and inexpensive to manufacture and also easy to assemble. Furthermore, the use of the annular sealing element requires no or at least no major design changes to the suction valve itself, so that the proposed sealing concept can be implemented easily and inexpensively.
Zur Fixierung des Saugventils an der Hochdruckpumpe ist vorzugsweise die Spannmutter auf einen Kragenabschnitt des Zylinderkopfs aufgeschraubt. Der Kragenabschnitt des Zylinderkopfs ist hierzu bevorzugt mit einem Außengewinde versehen, das an das Innengewinde der Spannmutter angepasst ist bzw. umgekehrt. Der Kragenabschnitt erleichtert die Montage. Das ringförmige Dichtelement ist bei montiertem Saugventil bevorzugt zwischen dem Bund der Magnethülse und einer Stirnfläche des Kragenabschnitts des Zylinderkopfs axial eingespannt. Das heißt, dass Feuchtigkeit von außen weder hinter die Magnethülse des Saugventils, noch hinter den Kragenabschnitt des Zylinderkopfs der Hochdruckpumpe gelangen kann. Idealerweise ist das axial eingespannte Dichtelement zugleich derart radial verformt, dass es sowohl an der Magnethülse als auch an der Spannmutter unter einer radialen Vorspannung anliegt. Auf diese Weise wird die Dichtwirkung weiter optimiert. For fixing the suction valve to the high pressure pump, the clamping nut is preferably screwed onto a collar portion of the cylinder head. The collar portion of the cylinder head is for this purpose preferably provided with an external thread which is adapted to the internal thread of the clamping nut and vice versa. The collar section facilitates installation. The annular sealing element is preferably clamped axially with the suction valve mounted between the collar of the magnet sleeve and an end face of the collar portion of the cylinder head. This means that moisture can not pass from the outside either behind the magnetic sleeve of the suction valve, or behind the collar portion of the cylinder head of the high-pressure pump. Ideally, the axially clamped sealing element is at the same time radially deformed in such a way that it bears against a radial prestress on both the magnet sleeve and the clamping nut. In this way, the sealing effect is further optimized.
Gemäß einer bevorzugten Ausführungsform der Erfindung ist demnach das ringförmige Dichtelement ferner zwischen der Spannmutter und der Magnethülse radial eingespannt. According to a preferred embodiment of the invention, therefore, the annular sealing element is further radially clamped between the clamping nut and the magnet sleeve.
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 Saugventil, das in eine Kraftstoff-Hochdruckpumpe integriert ist, und 1 shows a schematic longitudinal section through an inventive suction valve, which is integrated in a high-pressure fuel pump, and
Fig. 2-9 jeweils einen schematischen Querschnitt durch ein ringförmiges Dichtelement für ein erfindungsgemäßes Saugventil. FIGS. 2-9 each show a schematic cross section through an annular sealing element for a suction valve according to the invention.
Ausführliche Beschreibung der Zeichnungen Detailed description of the drawings
Das in der Fig. 1 dargestellte elektromagnetisch betätigbare Saugventil 1 dient der Versorgung einer Kraftstoff-Hochdruckpumpe 2 mit Kraftstoff. Das Saugventil 1 ist hierzu in einen Zylinderkopf 14 der Kraftstoff-Hochdruckpumpe 2 integriert, und zwar in der Weise, dass ein Ventilstößel 4 des Saugventils 1 über eine im Zylinderkopf 14 ausgebildete Bohrung 21 hubbeweglich geführt ist. Die Bohrung 21 mündet über einen Ventilsitz 23 in einen Hochdruckelementraum 20 der Kraftstoff-Hochdruckpumpe 2, so dass bei geöffnetem Saugventil 1 Kraftstoff aus einem Niederdruckraum 24 über Zulaufbohrungen 25und den Ventilsitz 23 in den Hochdruckelementraum 20 strömt. Bei geschlossenem Saugventil 1 wird der im Hochdruckelementraum 20 vorhandene Kraftstoff über die Hubbewegung eines Pumpenkolbens (nicht dargestellt) komprimiert und anschließend über ein Aus- lassventil (nicht dargestellt) einem Hochdruckspeicher (nicht dargestellt) zugeführt. The electromagnetically actuated intake valve 1 shown in FIG. 1 serves to supply a high-pressure fuel pump 2 with fuel. The suction valve 1 is for this purpose integrated into a cylinder head 14 of the high-pressure fuel pump 2, in such a way that a valve stem 4 of the intake valve 1 is guided in a liftable manner via a bore 21 formed in the cylinder head 14. The bore 21 opens via a valve seat 23 into a high-pressure element space 20 of the high-pressure fuel pump 2, so that when the suction valve 1 is open, fuel flows from a low-pressure space 24 via inlet bores 25 and the valve seat 23 into the high-pressure element space 20. When the suction valve 1 is closed, the fuel present in the high-pressure element space 20 is compressed via the stroke movement of a pump piston (not shown) and then discharged via an outlet. Lassventil (not shown) a high-pressure accumulator (not shown) supplied.
Der Ventilstößel 4 ist in Schließrichtung von der Federkraft einer Ventilfeder 22 beaufschlagt, so dass die Federkraft der Ventilfeder 22 den Ventilstößel 4 in den Ventilsitz 23 zieht. Um das Saugventil 1 entgegen der Federkraft der Ventilfeder 22 zu öffnen bzw. geöffnet zu halten, ist eine weitere Feder 26 vorgesehen, deren Federkraft größer als die der Ventilfeder 22 ist. Die weitere Feder 26 ist einerseits an einem Anker 5, andererseits an einem Polkern 17 abgestützt, der gemeinsam mit dem Anker 5 einen Arbeitsluftspalt 18 begrenzt. Bleibt eine zur Einwirkung auf den Anker 5 vorgesehene Magnetspule 3 unbestromt, hält die Federkraft der Feder 26 das Saugventil 1 geöffnet. Zum Schließen des Saugventils 1 wird die Magnetspule 3 bestromt. Es bildet sich ein Magnetfeld aus, dessen Magnetkraft den Anker 5 in Richtung des Polkerns 17 zieht, um den zwischen dem Polkern 17 und dem Anker 5 ausgebildeten Arbeitsluftspalt 18 zu schließen. Durch die Bewegung des Ankers 5 wird der Ventilstößel 4 entlastet, so dass die Ventilfeder 22 den Ventilstößel 4 in den Ventilsitz 23 zieht und das Saugventil 1 schließt. The valve stem 4 is acted upon in the closing direction by the spring force of a valve spring 22, so that the spring force of the valve spring 22 pulls the valve stem 4 into the valve seat 23. In order to open the intake valve 1 against the spring force of the valve spring 22 or to keep it open, another spring 26 is provided whose spring force is greater than that of the valve spring 22. The further spring 26 is supported on the one hand on an armature 5, on the other hand on a pole core 17 which defines a working air gap 18 together with the armature 5. If there remains a magnetic coil 3 provided for acting on the armature 5 without being energized, the spring force of the spring 26 keeps the suction valve 1 open. To close the suction valve 1, the magnetic coil 3 is energized. A magnetic field is formed whose magnetic force pulls the armature 5 in the direction of the pole core 17 in order to close the working air gap 18 formed between the pole core 17 and the armature 5. By the movement of the armature 5, the valve stem 4 is relieved, so that the valve spring 22 pulls the valve stem 4 in the valve seat 23 and the suction valve 1 closes.
Der Anker 5 ist vorliegend als Tauchanker ausgeführt und in einer zentralen Ausnehmung 6 eines Ventilkörpers 7 aufgenommen, der abschnittsweise in den Zylinderkopf 14 der Kraftstoff-Hochdruckpumpe 2 eingesetzt ist. Der Ventilkörper 7 ist über eine Hülse 19 mit dem Polkern 17 fest verbunden. Die Hülse 19 ist hierzu mit dem Ventilkörper 7 und dem Polkern 17 verschweißt. Radial außen auf dem Ventilkörper 7 ist eine Magnethülse 8 abgestützt, welche die Magnetspule 3 zumindest abschnittsweise umgibt. An der Magnethülse 8 ist ein Bund 9 ausgebildet, der sich nach radial außen erstreckt und der Abstützung eines Bundabschnitts 27 einer Spannmutter 10 dient, mittels welcher das Saugventil 1 am Zylinderkopf 14 der Kraftstoff-Hochdruckpumpe 2 fixiert ist. Der Zylinderkopf 14 weist hierzu einen Kragenabschnitt 15 auf, mit dem die Spannmutter 10 über einen Gewindeabschnitt 28 verschraubt ist. In the present case, the armature 5 is embodied as a plunger armature and accommodated in a central recess 6 of a valve body 7, which is inserted in sections into the cylinder head 14 of the high-pressure fuel pump 2. The valve body 7 is fixedly connected to the pole core 17 via a sleeve 19. The sleeve 19 is welded to the valve body 7 and the pole core 17 for this purpose. Radially outside on the valve body 7, a magnetic sleeve 8 is supported, which surrounds the magnetic coil 3 at least in sections. At the magnet sleeve 8, a collar 9 is formed, which extends radially outward and the support of a collar portion 27 of a clamping nut 10 is used, by means of which the suction valve 1 is fixed to the cylinder head 14 of the high-pressure fuel pump 2. The cylinder head 14 has for this purpose a collar portion 15, with which the clamping nut 10 is screwed by a threaded portion 28.
Um das Saugventil 1 vor eindringender Feuchtigkeit zu schützen, ist auf der Magnethülse 8 unterhalb des Bunds 9 ein ringförmiges Dichtelement 11 angeordnet, das beim Verschrauben der Spannmutter 10 mit dem Kragenabschnitt 15 des Zylinderkopfs 14 zwischen dem Bund 9 und einer Stirnfläche 16 des Kragenabschnitts 15 axial eingespannt wird. Dabei verformt sich das Dichtelement 11, so dass es vorzugsweise zugleich radial eingespannt wird, um die Dichtwirkung zu optimieren. Das Maß der Verformung des Dichtelements hängt zum einen von der axialen Vorspannkraft, zum anderen von der Querschnittsform des Dichtelements ab. In der in Fig. 1 dargestellten Ausführungsform weist das Dichtelement 11 einen rechteckigen Querschnitt auf. In order to protect the suction valve 1 from the ingress of moisture, an annular sealing element 11 is arranged on the magnet sleeve 8 below the collar 9, which when screwing the clamping nut 10 with the collar portion 15th the cylinder head 14 between the collar 9 and an end face 16 of the collar portion 15 is axially clamped. In this case, the sealing element 11 deforms, so that it is preferably clamped radially at the same time in order to optimize the sealing effect. The degree of deformation of the sealing element depends on the one hand on the axial biasing force, on the other hand on the cross-sectional shape of the sealing element. In the embodiment shown in Fig. 1, the sealing element 11 has a rectangular cross-section.
Vorteilhafte Querschnittsformvarianten sind in den Figuren 2 bis 9 dargestellt. Advantageous cross-sectional shape variants are shown in FIGS. 2 to 9.
Der Fig. 2 ist ein ringförmiges Dichtelement 11 mit einer im Wesentlichen rechteckigen Querschnittsform zu entnehmen, das darüber hinaus gerundete Kanten 12 aufweist. FIG. 2 shows an annular sealing element 11 with a substantially rectangular cross-sectional shape, which moreover has rounded edges 12.
Anstelle gerundeter Kanten 12 kann das Dichtelement 11 auch gefaste Kanten 12 aufweisen. Entsprechende Ausführungsformen sind in den Figuren 3 4 dargestellt. Instead of rounded edges 12, the sealing element 11 may also have chamfered edges 12. Corresponding embodiments are shown in FIGS.
Als besonders vorteilhaft wird eine Querschnittsform mit mindestens einer Ein- schnürung 13 angesehen, die außenumfangseitig (siehe Fig. 5), innenumfangsei- tig (siehe Fig. 6) oder sowohl außen- als auch innenumfangseitig ausgebildet sein kann (siehe Fig. 7). Alternativ (siehe Fig. 8) oder ergänzend (siehe Fig. 9) können stirnseitig angeordnete Einschnürungen 13 vorgesehen sein. Die mindestens eine Einschnürung 13 verbessert die Verformbarkeit des Dichtele- ments 11, wenn über die Spannmutter 10 eine axiale Vorspannkraft aufgebracht wird. Diese führt zu einer Verformung in radialer Richtung, so dass zugleich eine radiale Abdichtwirkung erzielbar ist. Particularly advantageous is a cross-sectional shape with at least one constriction 13, which may be on the outer peripheral side (see FIG. 5), on the inner peripheral side (see FIG. 6) or on both the outer and inner peripheral sides (see FIG. 7). Alternatively (see FIG. 8) or in addition (see FIG. 9), constrictions 13 arranged on the front side can be provided. The at least one constriction 13 improves the deformability of the sealing element 11 when an axial prestressing force is applied via the clamping nut 10. This leads to a deformation in the radial direction, so that at the same time a radial sealing effect can be achieved.

Claims

Ansprüche claims
1. Elektromagnetisch betätigbares Saugventil (1) für eine Kraftstoff- Hochdruckpumpe (2), umfassend eine ringförmige Magnetspule (3) zur Einwirkung auf einen mit einem Ventilstößel (4) koppelbaren Anker (5), der zumindest abschnittsweise in einer zentralen Ausnehmung (6) eines Ventilkörpers (7) hubbeweglich aufgenommen ist, wobei am Ventilkörper (7) eine die Magnetspule (3) zumindest abschnittsweise umgebende Magnethülse (8) axial abgestützt ist, die einen sich nach radial außen erstreckenden Bund (9) zur Aufnahme einer Spannmutter (10) besitzt, mittels welcher das Saugventil (1) an der Hochdruckpumpe (2) fixierbar ist, 1. Electromagnetically operated suction valve (1) for a high-pressure fuel pump (2), comprising an annular solenoid (3) for acting on a with a valve stem (4) can be coupled anchor (5), at least partially in a central recess (6) a valve body (7) is received in a liftable manner, wherein on the valve body (7) a magnetic coil (3) at least partially surrounding magnetic sleeve (8) is axially supported, which extends radially outwardly extending collar (9) for receiving a clamping nut (10) has, by means of which the suction valve (1) on the high-pressure pump (2) can be fixed,
dadurch gekennzeichnet, dass unmittelbar am Bund (9) anliegend ein ringförmiges Dichtelement (11) auf der Magnethülse (8) angeordnet ist.  characterized in that directly on the collar (9) fitting an annular sealing element (11) on the magnet sleeve (8) is arranged.
2. Saugventil nach Anspruch 1, 2. Suction valve according to claim 1,
dadurch gekennzeichnet, dass das ringförmige Dichtelement (11) aus einem elastisch verformbaren Werkstoff, beispielsweise aus Polytetrafluo- rethylen, Silikon oder Fluorkarbon- Kautschuk, gefertigt ist.  characterized in that the annular sealing element (11) is made of an elastically deformable material, for example of polytetrafluoroethylene, silicone or fluorocarbon rubber.
3. Saugventil nach Anspruch 1 oder 2, 3. Suction valve according to claim 1 or 2,
dadurch gekennzeichnet, dass das ringförmige Dichtelement (11) eine Querschnittsform besitzt, die um mindestens eine Achse spiegelsymmetrisch ist.  characterized in that the annular sealing element (11) has a cross-sectional shape which is mirror-symmetrical about at least one axis.
4. Saugventil nach einem der vorhergehenden Ansprüche, 4. Suction valve according to one of the preceding claims,
dadurch gekennzeichnet, dass das ringförmige Dichtelement (11) mindestens eine gerundete oder gefaste Kante (12) aufweist.  characterized in that the annular sealing element (11) has at least one rounded or chamfered edge (12).
5. Saugventil nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das ringförmige Dichtelement (11) mindestens eine Einschnürung (13) aufweist. 5. Suction valve according to one of the preceding claims, characterized in that the annular sealing element (11) has at least one constriction (13).
6. Saugventil nach einem der vorhergehenden Ansprüche, 6. Suction valve according to one of the preceding claims,
dadurch gekennzeichnet, dass das ringförmige Dichtelement (11) unter einer radialen Vorspannung an der Magnethülse (8) anliegt.  characterized in that the annular sealing element (11) bears against the magnet sleeve (8) under radial prestressing.
7. Kraftstoff-Hochdruckpumpe (2) für ein Kraftstoffeinspritzsystem mit einem Saugventil nach einem der vorhergehenden Ansprüche und einer Spannmutter (10), mittels welcher das Saugventil (1) an einem Zylinderkopf (14) der Kraftstoff-Hochdruckpumpe (2) fixiert ist, wobei vorzugsweise die Spannmutter (10) auf einen Kragenabschnitt (15) des Zylinderkopfs (14) aufgeschraubt ist. 7. High-pressure fuel pump (2) for a fuel injection system with a suction valve according to one of the preceding claims and a clamping nut (10), by means of which the suction valve (1) on a cylinder head (14) of the high pressure fuel pump (2) is fixed, Preferably, the clamping nut (10) is screwed onto a collar portion (15) of the cylinder head (14).
8. Kraftstoff-Hochdruckpumpe (2) nach Anspruch 7, 8. High-pressure fuel pump (2) according to claim 7,
dadurch gekennzeichnet, dass das ringförmige Dichtelement (11) zwischen dem Bund (9) der Magnethülse (8) und einer Stirnfläche (16) des Kragenabschnitts (15) des Zylinderkopfs (14) axial eingespannt ist.  characterized in that the annular sealing element (11) between the collar (9) of the magnet sleeve (8) and an end face (16) of the collar portion (15) of the cylinder head (14) is axially clamped.
9. Kraftstoff-Hochdruckpumpe (2) nach Anspruch 7 oder 8, 9. High-pressure fuel pump (2) according to claim 7 or 8,
dadurch gekennzeichnet, dass das ringförmige Dichtelement (11) zwischen der Spannmutter (10) und der Magnethülse (8) radial eingespannt ist.  characterized in that the annular sealing element (11) between the clamping nut (10) and the magnet sleeve (8) is radially clamped.
PCT/EP2017/065202 2016-08-17 2017-06-21 Electromagnetically actuatable suction valve and high-pressure fuel pump WO2018033278A1 (en)

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