EP2254130B1 - Residual air dividing disc - Google Patents

Residual air dividing disc Download PDF

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Publication number
EP2254130B1
EP2254130B1 EP10157979.5A EP10157979A EP2254130B1 EP 2254130 B1 EP2254130 B1 EP 2254130B1 EP 10157979 A EP10157979 A EP 10157979A EP 2254130 B1 EP2254130 B1 EP 2254130B1
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EP
European Patent Office
Prior art keywords
air gap
residual air
magnet
tongues
gap disc
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP10157979.5A
Other languages
German (de)
French (fr)
Other versions
EP2254130A2 (en
EP2254130A3 (en
Inventor
Jens Leister
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Filing date
Publication date
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Publication of EP2254130A2 publication Critical patent/EP2254130A2/en
Publication of EP2254130A3 publication Critical patent/EP2254130A3/en
Application granted granted Critical
Publication of EP2254130B1 publication Critical patent/EP2254130B1/en
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/16—Rectilinearly-movable armatures
    • H01F7/1638—Armatures not entering the winding
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0075—Stop members in valves, e.g. plates or disks limiting the movement of armature, valve or spring
    • 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
    • F02M2200/07—Fuel-injection apparatus having means for avoiding sticking of valve or armature, e.g. preventing hydraulic or magnetic sticking of parts
    • 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
    • F02M2200/8015—Provisions for assembly of fuel injection apparatus in a certain orientation, e.g. markings, notches or specially shaped sleeves other than a clip
    • 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
    • F02M2200/8053—Fuel injection apparatus manufacture, repair or assembly involving mechanical deformation of the apparatus or parts thereof
    • 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
    • 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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/16—Rectilinearly-movable armatures
    • H01F2007/1661—Electromagnets or actuators with anti-stick disc

Definitions

  • DE 196 50 865 A1 describes a solenoid valve for controlling the fuel pressure in a control chamber of an injection valve, such as a common rail high-pressure accumulator injection system. About the fuel pressure in the control chamber, a stroke movement of a valve piston is controlled, with which an injection port of the injection valve can be opened or closed.
  • the solenoid valve comprises an electromagnet, a movable armature and a valve member moved with the armature and acted upon by a valve closing spring in the closing direction, which valve member cooperates with the valve seat of the solenoid valve and thus controls the fuel drain from the control chamber.
  • the residual air gap of the magnetic circuit is designed very small to realize extremely short switching times.
  • the residual air gap which denotes the distance between the magnetic core and the armature, is set in magnetic valves for actuating fuel injectors in fuel injection systems by means of a residual air gap disc made of a non-magnetic metal foil.
  • a compromise between the strength or stability, the hydraulic requirements and the installation specifications must always be taken into account. So far, the residual air gap disc is placed on the armature and fixed by a spring plate of the solenoid valve spring, whereby the outflow of the control or leakage amount limits over the solenoid valve spring chamber.
  • a fuel injection valve for internal combustion engines is known with a solenoid valve comprising an electromagnet and a cooperating with this magnet armature. Between the electromagnet and the armature, a residual air gap disc is arranged, which is clamped for fixing between a cylindrical insert and the solenoid valve housing.
  • a residual air gap disk is fixed to the magnet sleeve by frictional engagement at pinching points on the end face of the magnet core facing the magnet armature.
  • the residual air gap disc is made of a ferromagnetic or non-magnetic material, such as a metallic foil, with a simple geometry.
  • the residual air gap disk according to the invention is exchangeable, without the magnetic assembly having to be disassembled for this purpose.
  • the residual air gap disc in case of malfunction is removed from the magnet assembly and either cleaned or replaced while preserving the assembled so far magnet assembly. Particles which form and deposit during the assembly of the magnet assembly do not necessarily have to be subsequently retrofitted between the residual air gap disk and the magnet core.
  • the residual air gap disk is a simple annular disk, with at least three tongues arranged on the outer circumference, the outer ends of which have a pitch circle diameter which is greater than the diameter of the magnet sleeve at the pinching points, so that an excess occurs.
  • the number of tongues is chosen so that a centering is possible. Due to the design of the residual air gap disc, this is easy and inexpensive to manufacture.
  • These tongues of the residual air gap disc in the installed state by elastic or plastic deformation the adhesion with the magnetic sleeve ago. If the magnetic sleeve has segments in the region of the pinching points, then the number of tongues depends on the number of segments, with at least opposing segments of the magnetic sleeve with tongues forming a frictional connection.
  • the residual air gap disk is fixed in a position adjacent to the end face of the magnetic core. Furthermore, the residual air gap disc is now also secured against rotation about a vertical axis, whereby openings to be provided in the magnet assembly additional Return channels can be recessed and kept accessible. Additional return passages are provided between the magnetic core and the magnet sleeve, the magnet core having axially extending apertures on its outside. These additional return channels improve the outflow behavior of the control and leakage amount in the low-pressure side return.
  • the method for mounting the residual air gap disc according to the invention is carried out, for example, such that a mounting tool receives the residual air gap disk over its entire area and only leaves out the at least three tongues arranged on the outer circumference. Applying a slight pressure, the residual air gap disc can be inserted and positioned adjacent to the magnetic core, whereby the tongues deform and are clamped at the Einklemmstellen.
  • the representation according to FIG. 1 is to take a schematic representation of a magnetic assembly of a fuel injector.
  • a magnet assembly 10 which serves to actuate a fuel injector, for example a fuel injector for a high-pressure accumulator injection system (common rail), is embedded in an injector body 12 of the fuel injector.
  • the magnet assembly 10 is located opposite a magnet armature 14 which is formed in a known from the prior art embodiment as a one-piece magnet armature, ie armature plate and armature pin of the magnet armature 14 form a component.
  • the armature 14 may be formed in two parts, ie, the anchor plate is slidably formed on the anchor bolt.
  • the armature 14 is acted upon on a flat side 16 by a solenoid valve spring 18.
  • an adjustment ring 20 is provided, which lies on the injector body 12 and at the same time serves as a support for a magnet sleeve 32.
  • the magnet sleeve 32 is provided with a in FIG. 1 Not shown clamping nut attached to the injector body 12 of the fuel injector.
  • the magnet sleeve 32 accommodates a magnetic core 22, an inner side 36 of the magnetic sleeve 32 facing an outer side 38 of the magnetic core 22.
  • a magnetic coil 24 is recessed, the magnetic core 22 rests on an annular overlap 34 of the magnetic sleeve 32, which may also be divided into segments.
  • the magnetic core 22 is open at one of the plan side 16 of the magnet armature 14 opposite end face 26 and divided by the position of the magnetic coil 24 into an inner pole 28 and an outer pole 30.
  • the magnetic core 22 is fixed within the magnet assembly 10, for example via a crimp or a welded connection.
  • the magnetic core 22 of the magnet assembly 10 comprises a passage opening in which the solenoid valve spring 18 is arranged and which simultaneously serves as a return 40 via the controlled during actuation of the solenoid valve from the control chamber of the fuel injector tax or leakage amount in the low-pressure side return, for example, a fuel injection system flowing back.
  • FIG. 2 shows that at least one axially extending recess 39 is provided on the outer side 38 of the magnetic core 22.
  • the recess 39 is formed by the difference between an outer diameter 37 of the magnetic core 22 and an inner diameter 41 of the magnetic core 22 in the region of the at least one recess 39.
  • at least one additional return channel 48 is provided between magnetic sleeve 32 and magnetic core 22 via the at least one recess 39 , whereby the control and leakage amount flows with low flow resistance, as in Fig. 1 is shown.
  • a residual air gap disk 44 is arranged at pinch points 42, adjacent to the end face 26 of the magnetic core 22, with a frictional connection between the residual air gap disk 44 and the magnet sleeve 32 at the pinch points 42.
  • the residual air gap disc 44 which is made, for example, as a thin metal foil of a ferromagnetic or non-magnetic material, is embodied in one embodiment as a circular ring 50, as shown in FIG FIG. 3 evident.
  • the formed as a circular ring 50 residual air gap disc 44 does not cover the inner pole 28 of the magnetic core 22 but only the outer pole 30, wherein the spring chamber in which the solenoid valve spring 18 is received, is freely accessible.
  • the formed as a circular ring residual air gap disc 44 is further dimensioned so that an opening of the at least one additional return channel 48 is not covered.
  • FIG. 3 shows a plan view of a residual air gap disk 44 according to an embodiment of the invention.
  • the illustrated residual air gap disk 44 is designed as a circular ring 50, with an inner diameter 54 of the residual air gap disk 44 and an outer diameter 56 of the residual air gap disk 44.
  • the inner diameter 54 of the annulus 50 formed as a residual air gap disk 44 is dimensioned so that this outer diameter of the inner pole 28 of the magnetic core 22 of Magnetic assembly 10 exceeds.
  • the inner diameter 54 of the residual air gap disk 44 can be selected such that the magnetic coil 24 is not substantially covered by the residual air gap disk 44.
  • the outer diameter 56 of the formed as a circular ring 50 residual air gap disc 44 is dimensioned so that it is less than a diameter 60 (see. FIG. 3
  • the outer diameter 56 of the annular gap 50 formed as the annular air gap disc 44 is optionally equal to or less than the inner diameter 41 of the magnetic core 22 in the area the recess 39, whereby the at least one additional return channel 48 is freely accessible.
  • tongues 46 are provided, the outer ends of which lie on a pitch circle diameter 58.
  • the pitch circle diameter 58 of the tongues 46 exceeds the diameter 60 of the magnetic sleeve 32 at the nip 42.
  • at least three tongues 46 are provided, which are arranged at a pitch 59 of 120 ° to each other.
  • Preference is given to four tongues 46, which are arranged distributed in a pitch 59 of 90 ° to one another uniformly over the outer circumference 52 of the residual air gap disk 44.
  • six tongues 46 may be provided at a pitch 59 of 60 °.
  • the number of tongues 46 on the outer circumference 52 of the residual air gap disk 44 may also be more. A higher number of tongues 46 on the outer circumference 52 of the residual air gap disk 44 and, consequently, a higher number of pinching points 42 center and increase the holding safety and the resistance to twisting of the residual air gap disk 44.
  • the number of tongues 46 is based on the design of the magnetic sleeve 32 at the pinching points 42. If the magnetic sleeve 32 is divided into segments at the nip 42, the number of tongues 46 depends on the number of segments of the magnetic sleeve 32, wherein at least opposite segments of the magnetic sleeve 32 with tongues 46 form a frictional connection and the residual air gap disc 44 is centered.
  • the tongues 46 are designed in such a way that at the pinch points 42 there is an extremely small radial force component.
  • the excess i. the difference of the pitch circle diameter 58 of the outer ends of the tongues 46 and the diameter 60 of the magnet sleeve 32 at the nip points 42 causes deformation of the tongues 46, i. the tongues 46 abut with their outer ends against the magnetic sleeve 32 and are bent against the advancing direction when the residual air disc 44 is mounted with pressure.
  • the deformation of the tongues 46 which may be both elastic and plastic, causes a frictional connection of the residual air gap disc 44 at the Einklemmstellen 42, as shown in the illustration of FIG. 4 can be seen in detail.
  • the outer diameter 56 of the residual air gap disk 44 is selected so that it is smaller than the diameter 60 of the magnetic sleeve 32 at the nip 42, so that the elastic or plastic Deformation takes place only at the tongues 46 and not along the outer periphery 52 of the residual air gap disc 44th
  • the residual air gap disk 44 Since the residual air gap disk 44 is fixed in position after assembly of the magnet assembly 10, it may be both retroactively integrated into an existing magnet assembly 10, as well as simply removed again from a magnet assembly 10.
  • the assembly of the residual air gap disk 44 takes place, for example, with a tool which receives the residual air gap disk 44 in a planar manner, but omits the tongues 46 arranged on the outer circumference 52.
  • the residual air gap disk 44 in this embodiment can be viewed from below, i. from the side of the armature 14 ago, be introduced with pressure until it rests against the end face 26 of the magnetic core 22.

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

Description

Stand der TechnikState of the art

DE 196 50 865 A1 beschreibt ein Magnetventil zur Steuerung des Kraftstoffdruckes in einem Steuerraum eines Einspritzventils, so z.B. eines Common-Rail-Hochdruckspeichereinspritzsystems. Über den Kraftstoffdruck im Steuerraum wird eine Hubbewegung eines Ventilkolbens gesteuert, mit dem eine Einspritzöffnung des Einspritzventils geöffnet oder geschlossen werden kann. Das Magnetventil umfasst einen Elektromagneten, einen beweglichen Anker und ein mit dem Anker bewegtes und von einer Ventilschließfeder in Schließrichtung beaufschlagtes Ventilglied, welches mit dem Ventilsitz des Magnetventils zusammenwirkt und so den Kraftstoffabfluss aus dem Steuerraum steuert. DE 196 50 865 A1 describes a solenoid valve for controlling the fuel pressure in a control chamber of an injection valve, such as a common rail high-pressure accumulator injection system. About the fuel pressure in the control chamber, a stroke movement of a valve piston is controlled, with which an injection port of the injection valve can be opened or closed. The solenoid valve comprises an electromagnet, a movable armature and a valve member moved with the armature and acted upon by a valve closing spring in the closing direction, which valve member cooperates with the valve seat of the solenoid valve and thus controls the fuel drain from the control chamber.

Bei einem aus dem Stand der Technik bekannten Magnetventil wird zur Realisierung extrem kurzer Schaltzeiten der Restluftspalt des Magnetkreises sehr klein ausgelegt. Der Restluftspalt, der den Abstand zwischen dem Magnetkern und dem Anker bezeichnet, wird bei Magnetventilen zur Betätigung von Kraftstoffinjektoren in Kraftstoffeinspritzsystemen mittels einer Restluftspaltscheibe aus einer nicht-magnetischen Metallfolie eingestellt. Bei der Gestaltung der Restluftspaltscheibe ist stets ein Kompromiss zwischen der Festigkeit bzw. Stabilität, den hydraulischen Anforderungen und den Einbaubegebenheiten zu berücksichtigen. Bisher wird die Restluftspaltscheibe auf den Anker gelegt und über einen Federteller der Magnetventilfeder fixiert, wodurch sich die Abströmung der Steuer- bzw. Leckagemenge über den Magnetventilfederraum einschränkt.In a known from the prior art solenoid valve, the residual air gap of the magnetic circuit is designed very small to realize extremely short switching times. The residual air gap, which denotes the distance between the magnetic core and the armature, is set in magnetic valves for actuating fuel injectors in fuel injection systems by means of a residual air gap disc made of a non-magnetic metal foil. In the design of the residual air gap disc, a compromise between the strength or stability, the hydraulic requirements and the installation specifications must always be taken into account. So far, the residual air gap disc is placed on the armature and fixed by a spring plate of the solenoid valve spring, whereby the outflow of the control or leakage amount limits over the solenoid valve spring chamber.

Ferner ist bekannt, eine geometrisch einfach gestaltete Restluftspaltscheibe zwischen dem Magnetkern und einem ringförmig verlaufenden Übergriff der Magnethülse anzuordnen und zu fixieren. Die Restluftspaltscheibe wird während der Montage der Magnetbaugruppe fixiert, wobei ein nachträglicher Einbau oder Austausch der Restluftspaltscheibe ohne eine Demontage der Magnetbaugruppe nicht möglich ist.Furthermore, it is known to arrange and fix a geometrically simply designed residual air gap disk between the magnetic core and an annularly extending overgrip of the magnetic sleeve. The residual air gap disc is during assembly of the magnet assembly fixed, with a subsequent installation or replacement of the residual air gap disc without disassembly of the magnet assembly is not possible.

Aus der DE 198 02 244 A1 ist weiterhin ein Kraftstoffeinspritzventil für Brennkraftmaschinen bekannt mit einem Magnetventil, das einen Elektromagneten und einen mit dem diesem zusammenwirkenden Magnetanker umfasst. Zwischen dem Elektromagnet und dem Magnetanker ist eine Restluftspaltscheibe angeordnet, die zur Fixierung zwischen einem zylindrischen Einsatz und dem Magnetventilgehäuse geklemmt ist.From the DE 198 02 244 A1 Further, a fuel injection valve for internal combustion engines is known with a solenoid valve comprising an electromagnet and a cooperating with this magnet armature. Between the electromagnet and the armature, a residual air gap disc is arranged, which is clamped for fixing between a cylindrical insert and the solenoid valve housing.

Offenbarung der ErfindungDisclosure of the invention

Der erfindungsgemäß vorgeschlagenen Lösung folgend, wird eine Restluftspaltscheibe durch Kraftschluss an Einklemmstellen an der dem Magnetanker zuweisenden Stirnseite des Magnetkerns anliegend an der Magnethülse fixiert. Die Restluftspaltscheibe ist aus einem ferromagnetischen oder nicht-magnetischen Material, beispielsweise einer metallischen Folie, mit einer einfachen Geometrie hergestellt. Durch die Fixierung der Restluftspaltscheibe an Einklemmstellen durch Kraftschluss wird die Restluftspaltscheibe nach Montage der Magnetbaugruppe und vor der Injektormontage eingebaut, wobei der gesamte Montageablauf nicht gestört wird und demnach vereinfacht ist.Following the solution proposed according to the invention, a residual air gap disk is fixed to the magnet sleeve by frictional engagement at pinching points on the end face of the magnet core facing the magnet armature. The residual air gap disc is made of a ferromagnetic or non-magnetic material, such as a metallic foil, with a simple geometry. By fixing the residual air gap disc at pinch points by traction, the residual air gap disc is installed after installation of the magnet assembly and before injector mounting, the entire assembly process is not disturbed and is therefore simplified.

Die Restluftspaltscheibe gemäß der Erfindung ist austauschbar, ohne dass hierfür die Magnetbaugruppe zerlegt werden muss. So wird die Restluftspaltscheibe im Falle einer Fehlfunktion aus der Magnetbaugruppe entfernt und entweder gereinigt oder ersetzt unter Erhaltung der soweit montierten Magnetbaugruppe. Partikel, die sich bei der Montage der Magnetbaugruppe bilden und ablagern, müssen nicht notwendigerweise nachträglich zwischen Restluftspaltscheibe und Magnetkern aufwendig entfernt werden.The residual air gap disk according to the invention is exchangeable, without the magnetic assembly having to be disassembled for this purpose. Thus, the residual air gap disc in case of malfunction is removed from the magnet assembly and either cleaned or replaced while preserving the assembled so far magnet assembly. Particles which form and deposit during the assembly of the magnet assembly do not necessarily have to be subsequently retrofitted between the residual air gap disk and the magnet core.

Die Restluftspaltscheibe ist eine einfache kreisringförmig ausgebildete Scheibe, mit mindestens drei an dem Außenumfang angeordneten Zungen, deren äußere Enden einen Teilkreisdurchmesser aufweisen, der größer ist als der Durchmesser der Magnethülse an den Einklemmstellen, so dass ein Übermaß entsteht. Die Anzahl der Zungen wird so gewählt, dass eine Zentrierung möglich ist. Durch die Ausgestaltung der Restluftspaltscheibe ist diese einfach und kostengünstig herzustellen. Diese Zungen der Restluftspaltscheibe stellen im eingebauten Zustand durch elastische oder plastische Verformung den Kraftschluss mit der Magnethülse her. Weist die Magnethülse in dem Bereich der Einklemmstellen Segmente auf, so richtet sich die Anzahl der Zungen nach der Anzahl der Segmente, wobei zumindest gegenüberliegende Segmente der Magnethülse mit Zungen einen Kraftschluss bilden. Dadurch wird die Restluftspaltscheibe in einer Position, anliegend an die Stirnseite des Magnetkerns, fixiert. Des Weiteren ist die Restluftspaltscheibe nun auch verdrehsicher um eine senkrechte Achse festgelegt, wodurch Öffnungen zu in der Magnetbaugruppe vorgesehenen zusätzlichen Rücklaufkanälen ausgespart und zugänglich gehalten werden können. Zusätzliche Rücklaufkanäle sind zwischen Magnetkern und Magnethülse bereitgestellt, wobei der Magnetkern an seiner Außenseite sich in Axialrichtung verlaufende Aunsnehmungen aufweist. Diese zusätzlichen Rücklaufkanäle verbessern das Abströmverhalten der Steuer- und Leckagemenge in den niederdruckseitigen Rücklauf.The residual air gap disk is a simple annular disk, with at least three tongues arranged on the outer circumference, the outer ends of which have a pitch circle diameter which is greater than the diameter of the magnet sleeve at the pinching points, so that an excess occurs. The number of tongues is chosen so that a centering is possible. Due to the design of the residual air gap disc, this is easy and inexpensive to manufacture. These tongues of the residual air gap disc in the installed state by elastic or plastic deformation the adhesion with the magnetic sleeve ago. If the magnetic sleeve has segments in the region of the pinching points, then the number of tongues depends on the number of segments, with at least opposing segments of the magnetic sleeve with tongues forming a frictional connection. As a result, the residual air gap disk is fixed in a position adjacent to the end face of the magnetic core. Furthermore, the residual air gap disc is now also secured against rotation about a vertical axis, whereby openings to be provided in the magnet assembly additional Return channels can be recessed and kept accessible. Additional return passages are provided between the magnetic core and the magnet sleeve, the magnet core having axially extending apertures on its outside. These additional return channels improve the outflow behavior of the control and leakage amount in the low-pressure side return.

Das Verfahren zur Montage der Restluftspaltscheibe gemäß der Erfindung erfolgt beispielsweise derart, dass ein Montagewerkzeug die Restluftspaltscheibe vollflächig aufnimmt und nur die am Außenumfang angeordneten mindestens drei Zungen ausspart. Unter Aufwendung eines leichten Drucks kann die Restluftspaltscheibe eingeschoben und anliegend an den Magnetkern positioniert werden, wobei sich die Zungen verformen und so an den Einklemmstellen eingespannt werden.The method for mounting the residual air gap disc according to the invention is carried out, for example, such that a mounting tool receives the residual air gap disk over its entire area and only leaves out the at least three tongues arranged on the outer circumference. Applying a slight pressure, the residual air gap disc can be inserted and positioned adjacent to the magnetic core, whereby the tongues deform and are clamped at the Einklemmstellen.

Kurze Beschreibung der ZeichnungenBrief description of the drawings

Anhand der Zeichnung wird die Erfindung nachstehend eingehender beschrieben.With reference to the drawing, the invention will be described below in more detail.

Es zeigt:

Fig. 1
die Restluftspaltscheibe, anliegend an den Magnetkern angeordnet und fixiert an einer Einklemmstelle der Magnethülse;
Fig. 2
eine Draufsicht auf den Magnetkern;
Fig. 3
eine Ausführungsform der erfindungsgemäß vorgeschlagenen Restluftspaltscheibe und
Fig. 4
eine Detailansicht der Einklemmstelle mit angeordneter erfindungsgemäß vorgeschlagener Restluftspaltscheibe.
It shows:
Fig. 1
the Restluftspaltscheibe, arranged adjacent to the magnetic core and fixed at a Einklemmstelle the magnet sleeve;
Fig. 2
a plan view of the magnetic core;
Fig. 3
an embodiment of the present invention proposed residual air gap disc and
Fig. 4
a detailed view of the Einklemmstelle with arranged inventively proposed residual air gap disc.

Ausführungsformenembodiments

Der Darstellung gemäß Figur 1 ist in schematischer Wiedergabe eine Magnetbaugruppe eines Kraftstoffinjektors zu entnehmen.The representation according to FIG. 1 is to take a schematic representation of a magnetic assembly of a fuel injector.

Eine Magnetbaugruppe 10, die der Betätigung eines Kraftstoffinjektors, z.B. eines Kraftstoffinjektors für ein Hochdruckspeichereinspritzsystem (Common-Rail) dient, ist in einen Injektorkörper 12 des Kraftstoffinjektors eingelassen. Der Magnetbaugruppe 10 gegenüberliegend befindet sich ein Magnetanker 14, der in einer aus dem Stand der Technik bekannten Ausführungsform als einteiliger Magnetanker ausgebildet ist, d.h. Ankerplatte und Ankerbolzen des Magnetankers 14 bilden ein Bauteil. Alternativ kann der Magnetanker 14 auch zweiteilig ausgebildet sein, d.h. die Ankerplatte ist an dem Ankerbolzen verschieblich ausgebildet. Der Magnetanker 14 wird an einer Planseite 16 durch eine Magnetventilfeder 18 beaufschlagt. Zur Einstellung eines Magnetventilhubs ist ein Einstellring 20 vorgesehen, der auf dem Injektorkörper 12 liegt und gleichzeitig als Auflage für eine Magnethülse 32 dient. Die Magnethülse 32 wird mit einer in Figur 1 nicht dargestellten Spannmutter am Injektorkörper 12 des Kraftstoffinjektors befestigt. Die Magnethülse 32 nimmt in sich einen Magnetkern 22 auf, wobei eine Innenseite 36 der Magnethülse 32 einer Außenseite 38 des Magnetkerns 22 gegenüberliegt. In den Magnetkern 22 ist seinerseits eine Magnetspule 24 eingelassen, wobei der Magnetkern 22 auf einem ringförmigen Übergriff 34 der Magnethülse 32 aufliegt, welcher auch in Segmente unterteilt sein kann. Der Magnetkern 22 ist an einer der Planseite 16 des Magnetankers 14 gegenüberliegenden Stirnseite 26 offen und durch die Lage der Magnetspule 24 in einen Innenpol 28 und einen Außenpol 30 unterteilt. Der Magnetkern 22 wird innerhalb der Magnetbaugruppe 10 beispielsweise über eine Bördelung oder eine Schweißverbindung fixiert.A magnet assembly 10, which serves to actuate a fuel injector, for example a fuel injector for a high-pressure accumulator injection system (common rail), is embedded in an injector body 12 of the fuel injector. The magnet assembly 10 is located opposite a magnet armature 14 which is formed in a known from the prior art embodiment as a one-piece magnet armature, ie armature plate and armature pin of the magnet armature 14 form a component. Alternatively, the armature 14 may be formed in two parts, ie, the anchor plate is slidably formed on the anchor bolt. The armature 14 is acted upon on a flat side 16 by a solenoid valve spring 18. To set a solenoid valve stroke, an adjustment ring 20 is provided, which lies on the injector body 12 and at the same time serves as a support for a magnet sleeve 32. The magnet sleeve 32 is provided with a in FIG. 1 Not shown clamping nut attached to the injector body 12 of the fuel injector. The magnet sleeve 32 accommodates a magnetic core 22, an inner side 36 of the magnetic sleeve 32 facing an outer side 38 of the magnetic core 22. In the magnetic core 22, in turn, a magnetic coil 24 is recessed, the magnetic core 22 rests on an annular overlap 34 of the magnetic sleeve 32, which may also be divided into segments. The magnetic core 22 is open at one of the plan side 16 of the magnet armature 14 opposite end face 26 and divided by the position of the magnetic coil 24 into an inner pole 28 and an outer pole 30. The magnetic core 22 is fixed within the magnet assembly 10, for example via a crimp or a welded connection.

Der Magnetkern 22 der Magnetbaugruppe 10 umfasst eine Durchgangsöffnung, in der die Magnetventilfeder 18 angeordnet ist und die gleichzeitig als ein Rücklauf 40 dient, über den bei Betätigung des Magnetventils aus dem Steuerraum des Kraftstoffinjektors abgesteuerte Steuer- bzw. Leckagemenge in den niederdruckseitigen Rücklauf beispielsweise eines Kraftstoffeinspritzsystems zurückströmt.The magnetic core 22 of the magnet assembly 10 comprises a passage opening in which the solenoid valve spring 18 is arranged and which simultaneously serves as a return 40 via the controlled during actuation of the solenoid valve from the control chamber of the fuel injector tax or leakage amount in the low-pressure side return, for example, a fuel injection system flowing back.

Aus der Darstellung gemäß Figur 2 geht hervor, dass an der Außenseite 38 des Magnetkerns 22 mindestens eine in Axialrichtung verlaufende Ausnehmung 39 vorgesehen ist. Die Ausnehmung 39 wird gebildet durch die Differenz eines Außendurchmessers 37 des Magnetkerns 22 und einem Innendurchmesser 41 des Magnetkerns 22 in dem Bereich der mindestens einen Ausnehmung 39. Somit wird zwischen Magnethülse 32 und Magnetkern 22 über die mindestens eine Ausnehmung 39 mindestens ein zusätzlicher Rücklaufkanal 48 bereitgestellt, wodurch die Steuer- und Leckagemenge mit geringem Strömungswiderstand abströmt, wie dies in Fig. 1 dargestellt ist.From the illustration according to FIG. 2 shows that at least one axially extending recess 39 is provided on the outer side 38 of the magnetic core 22. The recess 39 is formed by the difference between an outer diameter 37 of the magnetic core 22 and an inner diameter 41 of the magnetic core 22 in the region of the at least one recess 39. Thus, at least one additional return channel 48 is provided between magnetic sleeve 32 and magnetic core 22 via the at least one recess 39 , whereby the control and leakage amount flows with low flow resistance, as in Fig. 1 is shown.

Aus der Darstellung gemäß Figur 1 geht ferner hervor, dass eine Restluftspaltscheibe 44 an Einklemmstellen 42, anliegend an die Stirnseite 26 des Magnetkerns 22, angeordnet ist, wobei ein Kraftschluss zwischen der Restluftspaltscheibe 44 und der Magnethülse 32 an den Einklemmstellen 42 besteht. Die Restluftspaltscheibe 44, die beispielsweise als dünne Metallfolie aus einem ferromagnetischen oder nicht-magnetischen Material gefertigt ist, ist in einer Ausführungsform als ein Kreisring 50 ausgeführt, wie dies aus der Darstellung gemäß Figur 3 hervorgeht. Die als Kreisring 50 ausgebildete Restluftspaltscheibe 44 überdeckt nicht den Innenpol 28 des Magnetkerns 22 sondern nur den Außenpol 30, wobei der Federraum, in dem die Magnetventilfeder 18 aufgenommen ist, frei zugänglich ist. Somit ist die Durchgangsöffnung in den niederdruckseitigen Rücklauf 40 frei und der Abfluss der Steuer- und Leckagemenge in den niederdruckseitigen Rücklauf 40 kann ungehindert erfolgen. Die als Kreisring ausgebildete Restluftspaltscheibe 44 ist ferner so dimensioniert, dass eine Öffnung des mindestens einen zusätzlichen Rücklaufkanals 48 nicht verdeckt ist.From the illustration according to FIG. 1 Furthermore, it can be seen that a residual air gap disk 44 is arranged at pinch points 42, adjacent to the end face 26 of the magnetic core 22, with a frictional connection between the residual air gap disk 44 and the magnet sleeve 32 at the pinch points 42. The residual air gap disc 44, which is made, for example, as a thin metal foil of a ferromagnetic or non-magnetic material, is embodied in one embodiment as a circular ring 50, as shown in FIG FIG. 3 evident. The formed as a circular ring 50 residual air gap disc 44 does not cover the inner pole 28 of the magnetic core 22 but only the outer pole 30, wherein the spring chamber in which the solenoid valve spring 18 is received, is freely accessible. Thus, the passage opening in the low-pressure side return 40 is free and the outflow of the control and leakage amount in the low-pressure side return 40 can take place unhindered. The formed as a circular ring residual air gap disc 44 is further dimensioned so that an opening of the at least one additional return channel 48 is not covered.

Der Kraftschluss der Restluftspaltscheibe 44 an den Einklemmstellen 42 erfolgt über Zungen 46, welche sich plastisch oder elastisch verformen.The adhesion of the residual air gap disc 44 at the Einklemmstellen 42 via tongues 46, which deform plastically or elastically.

Aus der Darstellung der Figur 3 ist eine Ausführungsform der erfindungsgemäßen Restluftspaltscheibe 44 zu entnehmen.From the representation of FIG. 3 an embodiment of the residual air gap disc 44 according to the invention can be seen.

Figur 3 zeigt eine Draufsicht auf eine Restluftspaltscheibe 44 gemäß einer Ausführungsform der Erfindung. Die dargestellte Restluftspaltscheibe 44 ist als Kreisring 50 ausgebildet, mit einem Innendurchmesser 54 der Restluftspaltscheibe 44 und einem Außendurchmesser 56 der Restluftspaltscheibe 44. Der Innendurchmesser 54 der als Kreisring 50 ausgebildeten Restluftspaltscheibe 44 ist so bemessen, dass dieser einen Außendurchmesser des Innenpols 28 des Magnetkerns 22 der Magnetbaugruppe 10 übersteigt. Des Weiteren kann der Innendurchmesser 54 der Restluftspaltscheibe 44 so gewählt sein, dass auch die Magnetspule 24 im Wesentlichen nicht durch die Restluftspaltscheibe 44 überdeckt ist. Der Außendurchmesser 56 der als Kreisring 50 ausgebildeten Restluftspaltscheibe 44 ist so dimensioniert, dass dieser geringer ist als ein Durchmesser 60 (vgl. Figur 3) der Magnethülse 32 an Einklemmstellen 42. Der Außendurchmesser 56 der als Kreisring 50 ausgebildeten Restluftspaltscheibe 44 ist optional gleich oder geringer als der Innendurchmesser 41 des Magnetkerns 22 in dem Bereich der Ausnehmung 39, wodurch der mindestens eine zusätzliche Rücklaufkanal 48 frei zugänglich ist. FIG. 3 shows a plan view of a residual air gap disk 44 according to an embodiment of the invention. The illustrated residual air gap disk 44 is designed as a circular ring 50, with an inner diameter 54 of the residual air gap disk 44 and an outer diameter 56 of the residual air gap disk 44. The inner diameter 54 of the annulus 50 formed as a residual air gap disk 44 is dimensioned so that this outer diameter of the inner pole 28 of the magnetic core 22 of Magnetic assembly 10 exceeds. Furthermore, the inner diameter 54 of the residual air gap disk 44 can be selected such that the magnetic coil 24 is not substantially covered by the residual air gap disk 44. The outer diameter 56 of the formed as a circular ring 50 residual air gap disc 44 is dimensioned so that it is less than a diameter 60 (see. FIG. 3 The outer diameter 56 of the annular gap 50 formed as the annular air gap disc 44 is optionally equal to or less than the inner diameter 41 of the magnetic core 22 in the area the recess 39, whereby the at least one additional return channel 48 is freely accessible.

Der Darstellung gemäß Figur 3 ist ferner zu entnehmen, dass an der als Kreisring 50 ausgebildeten Restluftspaltscheibe 44 gleichmäßig über einen Außenumfang 52 verteilt Zungen 46 vorgesehen sind, deren äußere Enden auf einem Teilkreisdurchmesser 58 liegen. Der Teilkreisdurchmesser 58 der Zungen 46 übersteigt den Durchmesser 60 der Magnethülse 32 an der Einklemmstelle 42. Gemäß der Erfindung sind mindestens drei Zungen 46 vorgesehen, welche in einer Teilung 59 von 120° zueinander angeordnet sind. Bevorzugt sind vier Zungen 46, die in einer Teilung 59 von 90° zueinander gleichmäßig über den Außenumfang 52 der Restluftspaltscheibe 44 verteilt angeordnet sind. In einer weiteren Ausführungsform können sechs Zungen 46 in einer Teilung 59 von 60° vorgesehen sein. Die Anzahl der Zungen 46 an dem Außenumfang 52 der Restluftspaltscheibe 44 kann ebenfalls auch mehr betragen. Eine höhere Anzahl der Zungen 46 an dem Außenumfang 52 der Restluftspaltscheibe 44 und damit einhergehend eine höhere Anzahl von Einklemmstellen 42 zentriert und steigert die Haltesicherheit und die Verdrehsicherheit der Restluftspaltscheibe 44. Die Anzahl der Zungen 46 orientiert sich an der Gestaltung der Magnethülse 32 an den Einklemmstellen 42. Ist die Magnethülse 32 an den Einklemmstellen 42 in Segmente unterteilt, richtet sich die Anzahl der Zungen 46 nach der Anzahl der Segmente der Magnethülse 32, wobei zumindest gegenüberliegende Segmente der Magnethülse 32 mit Zungen 46 einen Kraftschluss bilden und die Restluftspaltscheibe 44 zentriert ist. Die Zungen 46 sind derart ausgebildet, dass an den Einklemmstellen 42 ein möglicht geringer radialer Kraftanteil vorliegt.The representation according to FIG. 3 It can also be seen that on the formed as a circular ring 50 residual air gap disc 44 evenly distributed over an outer circumference 52 tongues 46 are provided, the outer ends of which lie on a pitch circle diameter 58. The pitch circle diameter 58 of the tongues 46 exceeds the diameter 60 of the magnetic sleeve 32 at the nip 42. According to the invention, at least three tongues 46 are provided, which are arranged at a pitch 59 of 120 ° to each other. Preference is given to four tongues 46, which are arranged distributed in a pitch 59 of 90 ° to one another uniformly over the outer circumference 52 of the residual air gap disk 44. In a further embodiment, six tongues 46 may be provided at a pitch 59 of 60 °. The number of tongues 46 on the outer circumference 52 of the residual air gap disk 44 may also be more. A higher number of tongues 46 on the outer circumference 52 of the residual air gap disk 44 and, consequently, a higher number of pinching points 42 center and increase the holding safety and the resistance to twisting of the residual air gap disk 44. The number of tongues 46 is based on the design of the magnetic sleeve 32 at the pinching points 42. If the magnetic sleeve 32 is divided into segments at the nip 42, the number of tongues 46 depends on the number of segments of the magnetic sleeve 32, wherein at least opposite segments of the magnetic sleeve 32 with tongues 46 form a frictional connection and the residual air gap disc 44 is centered. The tongues 46 are designed in such a way that at the pinch points 42 there is an extremely small radial force component.

Das Übermaß, d.h. die Differenz des Teilkreisdurchmessers 58 der äußeren Enden der Zungen 46 und des Durchmessers 60 der Magnethülse 32 an den Einklemmstellen 42, bewirkt eine Verformung der Zungen 46, d.h. die Zungen 46 stoßen mit ihren äußeren Enden an die Magnethülse 32 und werden bei einer mit Andruck erfolgenden Montage der Restluftspaltscheibe 44 entgegen der Vorschubrichtung gebogen.The excess, i. the difference of the pitch circle diameter 58 of the outer ends of the tongues 46 and the diameter 60 of the magnet sleeve 32 at the nip points 42 causes deformation of the tongues 46, i. the tongues 46 abut with their outer ends against the magnetic sleeve 32 and are bent against the advancing direction when the residual air disc 44 is mounted with pressure.

Die Verformung der Zungen 46, welche sowohl elastisch als auch plastisch sein kann, bewirkt einen Kraftschluß der Restluftspaltscheibe 44 an den Einklemmstellen 42, wie dies der Darstellung der Figur 4 im Detail zu entnehmen ist. Der Außendurchmesser 56 der Restluftspaltscheibe 44 wird so gewählt, dass er kleiner ist als der Durchmesser 60 der Magnethülse 32 an den Einklemmstellen 42, so dass die elastische bzw. plastische Verformung nur an den Zungen 46 erfolgt und nicht entlang des Außenumfangs 52 der Restluftspaltscheibe 44.The deformation of the tongues 46, which may be both elastic and plastic, causes a frictional connection of the residual air gap disc 44 at the Einklemmstellen 42, as shown in the illustration of FIG. 4 can be seen in detail. The outer diameter 56 of the residual air gap disk 44 is selected so that it is smaller than the diameter 60 of the magnetic sleeve 32 at the nip 42, so that the elastic or plastic Deformation takes place only at the tongues 46 and not along the outer periphery 52 of the residual air gap disc 44th

Durch die elastische oder plastische Verformung der Zungen 46 an den entsprechenden Einklemmstellen 42 wird darüber hinaus eine verdrehsichere Positionierung der Restluftspaltscheibe 44 in der Magnetbaugruppe 10 erreicht. Die verdrehsichere Fixierung senkrecht bezüglich einer Achse 62 ermöglicht eine radiale Positionierung der Restluftspaltscheibe 44, so dass eine Öffnung von mindestens einem zusätzlichen Rücklaufkanal 48 ausgespart wird und somit frei zugänglich ist. Bei Annäherung des Magnetankers 14 an den Magnetkern 22 strömt die Steuer- und Leckagemenge sowohl über den Rücklauf 40 als auch über den mindestens einen zusätzlichen Rücklaufkanal 48 ab.Due to the elastic or plastic deformation of the tongues 46 at the corresponding pinch points 42, a rotationally secure positioning of the residual air gap disk 44 in the magnet assembly 10 is also achieved. The rotationally fixed fixation perpendicular to an axis 62 allows a radial positioning of the residual air gap disc 44, so that an opening of at least one additional return channel 48 is recessed and thus freely accessible. When approaching the armature 14 to the magnetic core 22, the control and leakage amount flows both via the return line 40 and via the at least one additional return channel 48 from.

Da die Restluftspaltscheibe 44 nach der Montage der Magnetbaugruppe 10 in ihrer Position fixiert wird, kann sie sowohl nachträglich in eine bestehende Magnetbaugruppe 10 integriert werden, als auch einfach wieder aus einer Magnetbaugruppe 10 entfernt werden. Die Montage der Restluftspaltscheibe 44 erfolgt beispielsweise mit einem Werkzeug, welches die Restluftspaltscheibe 44 flächig aufnimmt, aber die am Außenumfang 52 angeordneten Zungen 46 ausspart. Die Restluftspaltscheibe 44 kann in dieser Ausführung von unten, d.h. von der Seite der Magnetankers 14 her, mit Andruck eingeführt werden bis sie an der Stirnseite 26 des Magnetkerns 22 anliegt.Since the residual air gap disk 44 is fixed in position after assembly of the magnet assembly 10, it may be both retroactively integrated into an existing magnet assembly 10, as well as simply removed again from a magnet assembly 10. The assembly of the residual air gap disk 44 takes place, for example, with a tool which receives the residual air gap disk 44 in a planar manner, but omits the tongues 46 arranged on the outer circumference 52. The residual air gap disk 44 in this embodiment can be viewed from below, i. from the side of the armature 14 ago, be introduced with pressure until it rests against the end face 26 of the magnetic core 22.

Claims (9)

  1. Magnet assembly (10) having a magnet core (22) which is accommodated in a magnet sleeve (32) and in which there is arranged a magnet coil (24) which acts on a magnet armature (14, 16), wherein the magnet core (22) has a face side (26) pointing towards the magnet armature (14, 16), and having a residual air gap disc (44),
    characterized
    in that, on the residual air gap disc (44), there are provided tongues (46), the outer ends of which lie on a pitch circle diameter (58), and the pitch circle diameter (58) of the tongues (46) exceeds the diameter (60) of the magnet sleeve (32) at clamping points (42), wherein a force fit exists between the residual air gap disc (44) and the magnet sleeve (32) at the clamping points (42) and thus fixes the residual air gap disc (44).
  2. Magnet assembly according to Claim 1, characterized in that the residual air gap disc (44) is fixed in a rotationally secured manner at the clamping points (42), wherein an openings of at least one additional return channel (48) of the magnet assembly (10), provided between magnet core (22) and magnet sleeve (32), is cut out.
  3. Magnet assembly according to Claim 1, characterized in that the residual air gap disc (44) is manufactured as a metallic foil composed of ferromagnetic or non-magnetic material.
  4. Magnet assembly according to Claim 1, characterized in that the residual air gap disc (44) is formed as a circular ring (50) with at least three tongues (46), arranged, in the case of three tongues (46), with a pitch (59) of 120° with respect to one another on an outer circumference (52) of the residual air gap disc (44).
  5. Magnet assembly according to Claim 1, characterized in that the residual air gap disc (44) has four tongues (46), arranged with a pitch (59) of 90° with respect to one another, and preferably six tongues (46), arranged with a pitch (59) of 60° with respect to one another, on the outer circumference (52).
  6. Magnet assembly according to Claim 1, characterized in that an internal diameter (54) of the residual air gap disc (44) is larger than an external diameter of an inner pole (28) of the magnet core (22) .
  7. Magnet assembly according to Claim 1, characterized in that at least three tongues (46) are provided, which are fixed at the clamping points (42) by means of elastic and/or plastic deformation.
  8. Magnet assembly according to Claim 1, characterized in that the residual air gap disc (44) is fixed into the fully assembled magnet assembly (10) at the clamping points (42).
  9. Method for assembling a magnet assembly (10) according to one or more of Claims 1 to 8, characterized in that the residual air gap disc (44) is fixed at the clamping points (42) after the assembly of the magnet assembly (10) and before an injector assembly process.
EP10157979.5A 2009-05-19 2010-03-26 Residual air dividing disc Active EP2254130B1 (en)

Applications Claiming Priority (1)

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DE200910003213 DE102009003213A1 (en) 2009-05-19 2009-05-19 Residual air gap disc

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EP2254130A2 EP2254130A2 (en) 2010-11-24
EP2254130A3 EP2254130A3 (en) 2014-12-10
EP2254130B1 true EP2254130B1 (en) 2018-08-15

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DE (1) DE102009003213A1 (en)

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DE102012206216A1 (en) 2012-04-16 2013-10-17 Robert Bosch Gmbh Magnetic valve of magnetic valve injector for fuel injection system used in combustion engine, has armature space that is enclosed by anchor plate, and quiescent state stroke impact space that is formed independently of armature space
DE102012206218A1 (en) 2012-04-16 2013-10-17 Robert Bosch Gmbh Magnetic valve for magnetic valve injector i.e. fuel injector, of common-rail injection system, has anchor plate and anchor bolt designed as cooperating components, which comprise interconnection making movements relative to each other
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Publication number Publication date
EP2254130A2 (en) 2010-11-24
EP2254130A3 (en) 2014-12-10
DE102009003213A1 (en) 2010-11-25
CN101894655B (en) 2016-10-19
CN101894655A (en) 2010-11-24

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