WO1999059169A1 - Magnet armature bearing, especially for proportional magnets and switching magnets in the area of hydraulics and pneumatics - Google Patents

Magnet armature bearing, especially for proportional magnets and switching magnets in the area of hydraulics and pneumatics Download PDF

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Publication number
WO1999059169A1
WO1999059169A1 PCT/EP1999/003293 EP9903293W WO9959169A1 WO 1999059169 A1 WO1999059169 A1 WO 1999059169A1 EP 9903293 W EP9903293 W EP 9903293W WO 9959169 A1 WO9959169 A1 WO 9959169A1
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WIPO (PCT)
Prior art keywords
ring
bearing
armature
rings
pressure pipe
Prior art date
Application number
PCT/EP1999/003293
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German (de)
French (fr)
Inventor
Gerhard Mutz
Peter Vincon
Henning Kaess
Original Assignee
Elektroteile 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 Elektroteile Gmbh filed Critical Elektroteile Gmbh
Priority to CA002331715A priority Critical patent/CA2331715A1/en
Publication of WO1999059169A1 publication Critical patent/WO1999059169A1/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
    • H01F7/081—Magnetic constructions

Definitions

  • Magnet armature mounting especially for proportional magnets and switching magnets in the hydraulic or pneumatic field
  • the invention relates to a bearing arrangement of the type specified in the preamble of claim 1.
  • the sliding film preferably made of Teflon, lies on the inside diameter over the entire circumference.
  • Teflon Teflon
  • the film must be cut very precisely in width so that there is no gap or overlap.
  • a precise puncture on the pole bottom and a stroke limitation are necessary so that the slide film cannot open up.
  • the length of the film must be made to the exact dimensions so that it does not move out of the recess.
  • the invention is therefore based on the object of creating a generic magnetic bearing arrangement which, while avoiding the disadvantages mentioned, ensures a permanent, smooth-running switching / sliding function of the armature and can also be produced precisely and automatically in a simple manner.
  • the stated object is achieved by the features specified in the characterizing part of patent claim 1.
  • the invention is accordingly based on the knowledge that a reliable and permanent mounting of the armature can be ensured in that the ring causing the magnetic separation, for example made of brass, can take over the bearing function by protruding inwards over the inside diameter of the pressure tube. With a corresponding length dimensioning of the ring relative to the length of the armature, only the ring which brings about the magnetic separation can be sufficient for the bearing and for this purpose have a longer or more short ring bearing surfaces.
  • these further rings advantageously consisting of the same material as the separating ring, i.e. preferably consist of brass.
  • the separation of the magnetic flux can be achieved by welding a non-ferromagnetic ring onto a corresponding pre-turned part, with a bearing ring being welded onto the other end in addition to the magnetic separating ring. Then the pre-turned part can be turned into a pressure pipe be, the two bearing rings protruding accordingly over the inner diameter.
  • the two ring bearings can also be produced by interposing non-magnetic rings in the pressure tube sections, these rings then being welded or soldered to the pole core or the pressure tube in order to achieve the pressure resistance.
  • Fig. 1 shows an axial section of a magnet armature bearing representing the prior art
  • FIG. 2 shows an axial section of a magnet armature bearing designed according to the invention
  • FIG. 3 shows a longitudinal section of the pressure tube designed according to the invention with a pole core without a magnet armature
  • FIG. 4 shows an axial section of a pre-turned part, from which the structure of the pressure tube with pole core shown in FIG. 3 can be produced.
  • the reference numeral 10 designates the pressure tube, which is connected via a magnetic separator to the pole core 12, which has a through hole 14 for the passage of an actuating rod and a screw thread connection 16.
  • the anchor 18 is slidably mounted within the pressure tube 10.
  • the magnetic separator is designed as a ring 20 made of brass or the like, the inner wall of which is flush with the inner wall of the pressure pipe.
  • the inner wall of the pressure pipe 10 and ring 20 is lined with a foil 22 made of Teflon, which protrudes into annular recesses 24 at both ends.
  • the magnetic separating ring 30 with a ring bearing 32 projects beyond the inner diameter of the pressure tube 10.
  • Another ring 34 used for storage is arranged in the end section of the pressure tube facing away from the core 12.
  • This bearing ring 34 has an inwardly projecting ring bearing 36 corresponding to the ring bearing 32.
  • These ring bearings 32 and 36 guide the armature 18 with low friction with small tolerances.
  • the ring bearings 32 and 36 can be equipped with axial oil guide grooves, not shown in the drawing.
  • the rings 30 and 34 can be inserted between pressure pipe sections and welded or soldered to the pressure pipe.
  • the ring 30 causing the magnetic separation is made of non-ferromagnetic material, for example brass or non-ferromagnetic steel, e.g. Remanit.
  • the other bearing ring 34 is made of the same material, but it is also possible to produce this ring from a different material which has favorable bearing properties.
  • FIG. 4 shows a solid pre-turned part 38 with a fully formed pole core 12 and two ring grooves 40 and 42, which are V-shaped in cross section, into which metal rings 44, 46 are inserted by cladding.
  • the pre-turned part shown in FIG. 4 is then finely machined in one clamping and working step in order to create the bearing body shown in FIG. 3.
  • Reference list

Abstract

The invention relates to an armature bearing for proportional magnets or switching magnets used in the area of hydraulics or pneumatics. The armature of a magnet of this type is guided inside a pressure pipe by two rings which are welded into said pressure pipe. Said rings project over the inner periphery of the pressure pipe with a ring bearing and guide the armature with minimum friction. The ring facing towards the pole core is the separating ring which consists of non-ferromagnetic material. This separating ring concentrates the magnetic flux between the pole core and the armature. The second separating ring, which is situated on the other end section of the pressure pipe, may advantageously also consist of a non-ferromagnetic material such as brass or non-ferromagnetic steel, for production-related technical reasons. The inventive bearing can either be produced by welding suitable bearing rings with inwardly projecting ring bearings in sections of pressure pipes or by applying rings by build-up welding in grooves with a V-shaped cross-section in a solid rough-turned component and forming the pressure pipe with the inwardly projecting ring bearings by turning out said component. The ring bearings can be equipped with axial oil grooves.

Description

Magnetankerlaqerung, insbesondere für Proportionalmagnete und Schaltmagnete im Hydraulik- oder Pneumatikbereich Magnet armature mounting, especially for proportional magnets and switching magnets in the hydraulic or pneumatic field
Die Erfindung bezieht sich auf eine Lageranordnung der im Oberbegriff des Patentanspruchs 1 angegebenen Gattung.The invention relates to a bearing arrangement of the type specified in the preamble of claim 1.
Für die zuverlässige Schaltung derartiger Magnete, bei denen die Bewegung des Ankers über eine den Polkern durchsetzende Schaltstange vorbestimmte Schaltfunktionen vornimmt, ist eine leichtgängige, verkantungsfreie Führung des Ankers im Druckrohr notwendig .For the reliable switching of magnets of this type, in which the movement of the armature performs predetermined switching functions via a switching rod passing through the pole core, a smooth-running, tilt-free guidance of the armature in the pressure tube is necessary.
Bisher war es üblich, den Anker möglichst spielfrei direkt im Druckrohr oder indirekt über eine Gleitfolie mit geringem Reibungskoeffizienten zu führen. Dabei liegt die, vorzugsweise aus Teflon bestehende Gleitfolie am Innendurchmesser über dem gesamten Umfang an. In bezug auf die Ankerführung hat sich eine solche Gleitfolie als zweckmäßig erwiesen unter der Voraussetzung, daß ein einwandfreier Sitz der Folie innerhalb des Gleitrohres gewährleistet war. Diese Voraussetzung war jedoch aus herstellungstechnischen Gründen vielfach nicht gewährleistet. Die Folie muß nämlich sehr genau in der Breite geschnitten werden, damit kein Spalt oder eine Überlappung eintritt. Weiter ist ein genauer Einstich am Polboden und eine Hubbegrenzung notwendig, damit sich die Gleit- folie nicht auf erfen kann. Die Länge der Folie muß genau maßhaltig gefertigt werden, damit diese nicht aus dem Einstich wandert . Ferner muß eine gleichmäßige Dicke der Folie an allen Stellen gewährleistet sein. Diese genannten Umstände erschweren die Fertigung, insbesondere eine automatisierbare Fertigung. Funktionen hat diese Gleitfolienlagerung noch den Nachteil, daß sie wegen der vollflächigen Berührung mit engem Spiel schmutzempfindlich ist, d.h. schon geringe, über die Bohrung des Polkerns eintretende Schmutzteilchen können die Verschiebung des Ankers beeinträchtigen.Until now, it has been customary to guide the anchor with as little play as possible directly in the pressure tube or indirectly via a sliding film with a low coefficient of friction. The sliding film, preferably made of Teflon, lies on the inside diameter over the entire circumference. With regard to the anchor guide, such a slide film has proven to be expedient, provided that the film was properly seated within the slide tube. However, this requirement was often not guaranteed for manufacturing reasons. The film must be cut very precisely in width so that there is no gap or overlap. Furthermore, a precise puncture on the pole bottom and a stroke limitation are necessary so that the slide film cannot open up. The length of the film must be made to the exact dimensions so that it does not move out of the recess. Furthermore, a uniform thickness of the film must be guaranteed at all points. These circumstances make production difficult, in particular automation that can be automated. Functions this slide film storage still has the disadvantage that it is due to the full contact with narrow Game is sensitive to dirt, ie even small dirt particles entering through the bore of the pole core can impair the displacement of the armature.
Der Erfindung liegt daher die Aufgabe zugrunde, eine gattungsgemäße Magnetlageranordnung zu schaffen, die unter Vermeidung der erwähnten Nachteile eine dauerhafte, leichtgängige Schalt- Verschiebefunktion des Ankers gewährleistet und auf einfache Weise präzise auch automatisch herstellbar ist.The invention is therefore based on the object of creating a generic magnetic bearing arrangement which, while avoiding the disadvantages mentioned, ensures a permanent, smooth-running switching / sliding function of the armature and can also be produced precisely and automatically in a simple manner.
Gelöst wird die gestellte Aufgabe durch die im Kennzeichnungs- teil des Patentanspruchs 1 angegebenen Merkmale. Der Erfindung liegt demgemäß die Erkenntnis zugrunde, daß eine zuverlässige und dauerhafte Lagerung des Ankers dadurch gewährleistet werden kann, daß der die magnetische Trennung bewirkende Ring, beispielsweise aus Messing, die Lagerfunktion übernehmen kann, indem er nach innen über den Innendurchmesser des Druckrohres einsteht. Bei entsprechender Längenbemessung des Rings relativ zur Länge des Ankers kann allein der die magnetische Trennung bewirkende Ring für die Lagerung ausreichend sein und zu diesem Zweck einen längeren oder mehrere kurze Ringlagerflächen aufweisen.The stated object is achieved by the features specified in the characterizing part of patent claim 1. The invention is accordingly based on the knowledge that a reliable and permanent mounting of the armature can be ensured in that the ring causing the magnetic separation, for example made of brass, can take over the bearing function by protruding inwards over the inside diameter of the pressure tube. With a corresponding length dimensioning of the ring relative to the length of the armature, only the ring which brings about the magnetic separation can be sufficient for the bearing and for this purpose have a longer or more short ring bearing surfaces.
Bevorzugt wird jedoch eine Anordnung mit mehreren in das Druck- röhr eingeschalteten Ringen, wobei diese weiteren Ringe zweckmäßigerweise aus dem gleichen Material bestehen wie der Trennring, d.h. vorzugsweise aus Messing bestehen. Im allgemeinen wird man mit zwei Lagerringen auskommen, nämlich einem ersten Lagerring, der von dem magnetischen Trennring gebildet wird und dem Polkern benachbart liegt und einem zweiten Lagerring, der am anderen Ende des Ankers angreift.However, an arrangement with a plurality of rings connected into the pressure tube is preferred, these further rings advantageously consisting of the same material as the separating ring, i.e. preferably consist of brass. In general, you will get by with two bearing rings, namely a first bearing ring which is formed by the magnetic separating ring and is adjacent to the pole core and a second bearing ring which engages at the other end of the armature.
Gemäß einem Herstellungsverfahren nach Anspruch 5 kann die Trennung des Magnetflusses durch Aufschweißen eines nicht ferromagnetischen Ringes auf ein entsprechendes Vordrehteil erreicht werden, wobei außer dem magnetischen Trennring noch ein Lagerring am anderen Ende aufgeschweißt wird. Danach kann das Vordrehteil zu einem Druckrohr ausgedreht werden, wobei die beiden Lagerringe entsprechend über den Innendurchmesser vorstehen.According to a manufacturing method according to claim 5, the separation of the magnetic flux can be achieved by welding a non-ferromagnetic ring onto a corresponding pre-turned part, with a bearing ring being welded onto the other end in addition to the magnetic separating ring. Then the pre-turned part can be turned into a pressure pipe be, the two bearing rings protruding accordingly over the inner diameter.
Nach einem weiteren Herstellungsverfahren gemäß Anspruch 6 können die beiden Ringlager auch durch Zwischenlegen nicht- magnetischer Ringe in die Druckrohrabschnitte hergestellt werden, wobei diese Ringe dann zur Erreichung der Druckfestigkeit mit dem Polkern bzw. dem Druckrohr verschweißt oder verlötet werden.According to a further production method according to claim 6, the two ring bearings can also be produced by interposing non-magnetic rings in the pressure tube sections, these rings then being welded or soldered to the pole core or the pressure tube in order to achieve the pressure resistance.
Zweckmäßige Ausgestaltungen der Erfindung ergeben sich aus den Unteransprüchen.Appropriate embodiments of the invention result from the subclaims.
Nachstehend wird die Erfindung unter Berücksichtigung des Standes der Technik anhand von Ausführungsbeispielen beschrieben. In der Zeichnung zeigen:The invention is described below with reference to the prior art using exemplary embodiments. The drawing shows:
Fig. 1 zeigt einen Axialschnitt einer den Stand der Technik repräsentierenden Magnetankerlagerung;Fig. 1 shows an axial section of a magnet armature bearing representing the prior art;
Fig. 2 zeigt einen Axialschnitt einer erfindungsgemäß ausgebildeten Magnetankerlagerung;2 shows an axial section of a magnet armature bearing designed according to the invention;
Fig. 3 zeigt einen Längsschnitt des erfin- dungsgemäß ausgebildeten Druckrohres mit Polkern ohne Magnetanker;3 shows a longitudinal section of the pressure tube designed according to the invention with a pole core without a magnet armature;
Fig. 4 zeigt einen Axialschnitt eines Vordrehteils, aus dem der aus Fig. 3 ersichtliche Aufbau des Druckrohres mit Polkern herstellbar ist.FIG. 4 shows an axial section of a pre-turned part, from which the structure of the pressure tube with pole core shown in FIG. 3 can be produced.
In sämtlichen Figuren ist mit dem Bezugszeichen 10 das Druckrohr bezeichnet, welches über ein magnetisches Trennstück mit dem Polkern 12 verbunden ist, der eine Durchgangsbohrung 14 zum Durchführen einer Betätigungsstange und einen Schraubgewindeanschluß 16 aufweist. Innerhalb des Druckrohres 10 ist der Anker 18 verschiebbar gelagert. Bei der den Stand der Technik repräsentierenden Anordnung gemäß Fig. 1 ist das magnetische Trennstück als Ring 20 aus Messing oder dergleichen ausgebildet, dessen Innenwand mit der Innenwand des Druckrohres fluchtet . Die Innnenwand von Druckrohr 10 und Ring 20 ist mit einer Folie 22 aus Teflon ausgekleidet, die an beiden Enden in ringförmige Einstiche 24 einsteht .In all figures, the reference numeral 10 designates the pressure tube, which is connected via a magnetic separator to the pole core 12, which has a through hole 14 for the passage of an actuating rod and a screw thread connection 16. The anchor 18 is slidably mounted within the pressure tube 10. 1, the magnetic separator is designed as a ring 20 made of brass or the like, the inner wall of which is flush with the inner wall of the pressure pipe. The inner wall of the pressure pipe 10 and ring 20 is lined with a foil 22 made of Teflon, which protrudes into annular recesses 24 at both ends.
Bei der erfindungsgemäßen Magnetankerlagerung gemäß Fig. 2 und 3 steht der magnetische Trennring 30 mit einem Ringlager 32 über den Innendurchmesser des Druckrohres 10 vor. Ein weiterer der Lagerung dienender Ring 34 ist in dem dem Pol- kern 12 abgewandten Endabschnitt des Druckrohres angeordnet . Dieser Lagerring 34 weist ein nach innen vorstehendes, dem Ringlager 32 entsprechendes Ringlager 36 auf. Diese Ringlager 32 und 36 führen den Anker 18 reibungsarm mit geringen Toleranzen. Die Ringlager 32 und 36 können zur weiteren Reibungs- verminderung mit in der Zeichnung nicht dargestellten axialen Ölführungsnuten ausgestattet sein.2 and 3, the magnetic separating ring 30 with a ring bearing 32 projects beyond the inner diameter of the pressure tube 10. Another ring 34 used for storage is arranged in the end section of the pressure tube facing away from the core 12. This bearing ring 34 has an inwardly projecting ring bearing 36 corresponding to the ring bearing 32. These ring bearings 32 and 36 guide the armature 18 with low friction with small tolerances. To further reduce friction, the ring bearings 32 and 36 can be equipped with axial oil guide grooves, not shown in the drawing.
Die Ringe 30 und 34 können zwischen Druckrohrabschnitte eingefügt und mit dem Druckrohr verschweißt oder verlötet werden. Der die magnetische Trennung bewirkende Ring 30 besteht aus nicht-ferromagnetischem Material, beispielsweise aus Messing oder auch nicht-ferromagnetischem Stahl, z.B. Remanit. Aus Zweckmäßigkeitsgründen besteht der andere Lagerring 34 aus dem gleichen Material, jedoch ist es auch möglich, diesen Ring aus einem anderen Material herzustellen, welches günstige Lagereigenschaften besitzt.The rings 30 and 34 can be inserted between pressure pipe sections and welded or soldered to the pressure pipe. The ring 30 causing the magnetic separation is made of non-ferromagnetic material, for example brass or non-ferromagnetic steel, e.g. Remanit. For reasons of expediency, the other bearing ring 34 is made of the same material, but it is also possible to produce this ring from a different material which has favorable bearing properties.
Ein anderes vorteilhaftes Herstellungsverfahren wird im folgenden anhand der Fig. 4 beschrieben. Die Fig. 4 zeigt ein massives Vordrehteil 38 mit fertig ausgebildetem Polkern 12 und zwei im Querschnitt V-förmigen Ringnuten 40 bzw. 42, in die durch Auftragsschweißen Metallringe 44, 46 eingefügt sind. In einem Aufspann- und Arbeitsgang wird dann das aus Fig. 4 ersichtliche Vordrehteil fein bearbeitet, um den aus Fig. 3 ersichtlichen Lagerkörper zu schaffen. BezugszeichenlisteAnother advantageous manufacturing method is described below with reference to FIG. 4. FIG. 4 shows a solid pre-turned part 38 with a fully formed pole core 12 and two ring grooves 40 and 42, which are V-shaped in cross section, into which metal rings 44, 46 are inserted by cladding. The pre-turned part shown in FIG. 4 is then finely machined in one clamping and working step in order to create the bearing body shown in FIG. 3. Reference list
DruckrohrPressure pipe
PolkernPolkern
DurchgangsbohrungThrough hole
SchraubgewindeanschlußScrew thread connection
Ankeranchor
Ringring
Foliefoil
EinstichePunctures
TrennringSeparating ring
RinglagerRing bearing
LagerringBearing ring
RinglagerRing bearing
VordrehteilPre-turned part
RingnuteRing groove
RingnuteRing groove
Metallring
Figure imgf000007_0001
Metallring Metal ring
Figure imgf000007_0001
Metal ring

Claims

55
Patentansprücheclaims
1. Lageranordnung für den Anker (18) eines Magneten, 10 insbesondere eines Proportionalmagneten oder eines Schaltmagneten im Hydraulik- oder Pneumatikbereich, wobei der Anker (18) innerhalb eines ferromagnetischen Druckrohres (10) verschiebbar ist und zwischen Druckrohr (10) und Polkern (12) zur Konzentration des Magnetflusses über den Anker zum Polboden 15 ein nicht-ferromagnetischer Ring angeordnet ist, dadurch gekennzeichnet, daß der nicht-ferromagnetisehe Ring (30) mit einem Ringlager (32) über den Innendurchmesser des Druckrohres (10) nach innen vorsteht und den Anker (18) führt.1. Bearing arrangement for the armature (18) of a magnet, 10 in particular a proportional magnet or a switching magnet in the hydraulic or pneumatic field, the armature (18) being displaceable within a ferromagnetic pressure tube (10) and between the pressure tube (10) and the pole core (12 ) a non-ferromagnetic ring is arranged to concentrate the magnetic flux via the armature to the pole bottom 15, characterized in that the non-ferromagnetic ring (30) with an annular bearing (32) protrudes inward beyond the inner diameter of the pressure tube (10) and the Anchor (18) leads.
202. Lageranordnung nach Anspruch 1 , dadurch gekennzeichnet, daß der nicht-ferromagnetische Trennring (30) benachbart zum Polkern (12) im Druckrohr (10) angeordnet ist und in dem dem Polkern (12) abgewandten Endabschnitt des Druckrohres (10) ein weiterer Lagerring (34) ein- 25 gefügt ist, der mit einem nach innen vorstehenden Ringlager (36) für den Anker (18) ausgestattet ist.202. Bearing arrangement according to claim 1, characterized in that the non-ferromagnetic separating ring (30) is arranged adjacent to the pole core (12) in the pressure tube (10) and in the end section of the pressure tube (10) facing away from the pole core (12) a further bearing ring (34) is inserted, which is equipped with an inwardly projecting ring bearing (36) for the armature (18).
3. Lageranordnung nach den Ansprüchen 1 und 2 , dadurch gekennzeichnet, daß die Ringlager (32, 36) eine gegen-3. Bearing arrangement according to claims 1 and 2, characterized in that the ring bearing (32, 36) a counter-
30 über den sie tragenden Ringen (30, 34) kleinere axiale Länge aufweisen.30 have smaller axial length over the rings (30, 34) carrying them.
4. Lageranordnung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Ringlager (32, 36) Axial-4. Bearing arrangement according to one of claims 1 to 3, characterized in that the ring bearing (32, 36) axial
35 Ölführungsnuten aufweisen. Have 35 oil guide grooves.
5. Verfahren zur Herstellung einer Magnetlageranordnung gemäß Anspruch 1, dadurch gekennzeichnet, daß auf ein massiv ausgebildetes Vordrehteil (38) Ringnuten (40, 42) eingedreht werden, in die 5 durch Auftragsschweißen Metallringe (44, 46) eingesetzt werden, und daß das Vordrehteil (38) zwecks Schaffung des Druckrohres (10) mit nach innen einstehenden Ringlagern ausgedreht wird.5. A method for producing a magnetic bearing arrangement according to claim 1, characterized in that ring grooves (40, 42) are screwed into a solidly formed pre-turned part (38) into which 5 metal rings (44, 46) are used by cladding, and that the pre-turned part (38) for the creation of the pressure pipe (10) with ring bearings protruding inwards.
106. Verfahren zur Herstellung einer Magnetlageranordnung gemäß Anspruch 1 , dadurch gekennzeichnet, daß in Druckrohrabschnitte Ringe (30,106. A method for producing a magnetic bearing arrangement according to claim 1, characterized in that rings (30,
34) eingeschweißt oder eingelötet werden, die die nach innen vorstehenden Ringlager (32, 36) bilden. 15 34) are welded or soldered in, which form the ring bearings (32, 36) projecting inwards. 15
PCT/EP1999/003293 1998-05-14 1999-05-12 Magnet armature bearing, especially for proportional magnets and switching magnets in the area of hydraulics and pneumatics WO1999059169A1 (en)

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CA002331715A CA2331715A1 (en) 1998-05-14 1999-05-12 Magnet armature bearing, especially for proportional magnets and switching magnets in the area of hydraulics and pneumatics

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DE1998121741 DE19821741C2 (en) 1998-05-14 1998-05-14 Magnetic armature bearings, in particular for proportional magnets and switching magnets in hydraulic or pneumatic operation and process for its manufacture
DE19821741.2 1998-05-14

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DE102009012023B3 (en) * 2009-03-10 2010-10-07 Hydraulik-Ring Gmbh Electromagnetic actuator for hydraulic valve i.e. cartridge valve, utilized for cam shaft adjuster, has unmagnetizable sleeve and spacer piece forming internal component made of hydraulically leak-proof sinter metal

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DE19821741C2 (en) 2002-02-07
DE19821741A1 (en) 1999-11-18
CA2331715A1 (en) 1999-11-18

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