EP0210650B1 - Electromagnet - Google Patents

Electromagnet Download PDF

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Publication number
EP0210650B1
EP0210650B1 EP86110477A EP86110477A EP0210650B1 EP 0210650 B1 EP0210650 B1 EP 0210650B1 EP 86110477 A EP86110477 A EP 86110477A EP 86110477 A EP86110477 A EP 86110477A EP 0210650 B1 EP0210650 B1 EP 0210650B1
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EP
European Patent Office
Prior art keywords
piston
groove
bearing ring
bearing
tube
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.)
Expired - Lifetime
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EP86110477A
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German (de)
French (fr)
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EP0210650A1 (en
Inventor
Christoph Ing. Grad. Gibas
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BSO Steuerungstechnik GmbH
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BSO Steuerungstechnik GmbH
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Publication of EP0210650A1 publication Critical patent/EP0210650A1/en
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    • 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
    • H01F7/1607—Armatures entering the winding
    • 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
    • H01F2007/085—Yoke or polar piece between coil bobbin and armature having a gap, e.g. filled with nonmagnetic material

Definitions

  • the invention relates to an electromagnet, the armature of which is designed in the manner of a piston and is guided so as to be longitudinally displaceable within a tube which is surrounded by the winding of the magnet on at least part of its length, the piston for its displaceable mounting within the tube at least one bearing ring made of an elastic, non-magnetic material, which surrounds the piston substantially in a ring, cooperates with a groove machined into the outside of the piston, against movement relative to the groove by engaging at least one radially inward bulge of the bearing ring in a shape irregularity of the groove secured and has a lubricious material at least on its outer sliding surface interacting with the wall of the tube.
  • An electromagnet of this type is already known from DE utility model 1 850887.
  • the bearing ring is formed in one piece and slotted in the known electromagnet so that the bearing ring can be spread or bent open for the assembly process.
  • the spreading or bending of the ring is unavoidable because there is no other way to position the bearing ring in the circumferential ring groove of the piston if the bearing ring has dimensions such that it is secured against axial displacement on the piston by engagement with the ring groove .
  • the invention has for its object to provide an electromagnet in which the bearing ring can be brought into position on the piston serving as an anchor without a disturbing deformation.
  • the groove starting from an end face of the piston, extends over at least part of the axial length of the piston, based on the longitudinal axis of the tube, and transversely to the central plane of the bearing ring that the bearing ring is self-contained so that the bulge is in the form of an undivided rib extending in the longitudinal direction of the groove, the width of which is coordinated with that of the groove, and that at least one to form the irregularity in shape interacting with the bulging of the bearing ring the two opposing longitudinal walls of the groove are rounded to a length adapted to the width of the bearing ring in the region of the transition to the adjacent lateral surface of the piston to form an edge recess in which the bearing ring is secured against axial displacement on the piston.
  • the part of the bearing ring intended for engagement in the groove can be inserted into the groove from the end face of the piston without the ring part engaging in the groove needs to be lifted over non-recessed areas of the piston skirt, as is required when inserting a slotted ring into an annular groove of a piston.
  • the part of the ring engaging in the groove in the form of an inwardly projecting bulge of the ring, which engages in an edge recess provided on the groove, which is formed by rounding off the edges of the opposing longitudinal walls of the groove, it is possible to form the bearing ring as a self-contained, not slotted ring.
  • the closed ring needs to be widened only slightly by slightly pulling out the bulge so that it can be moved axially over the lateral surface of the piston until the edges of the bulge are aligned with the edge depressions of the groove and it is due to the elasticity of the Ring snaps into place and thus forms a safeguard against axial displacement of the ring.
  • the deformation of the closed bearing ring during the assembly process of the same is so slight that there is no fear of damage to the base of the sliding layer if a lubricious coating is present on the outside of the bearing ring.
  • the deformation only occurs at the bulge, which is slightly pulled out when the bearing ring is widened, there would be no risk of malfunction even if the coating was damaged at the deformed locations, because these damaged locations lie within the region of the edge depressions of the groove relative to the outer diameter of the bearing ring would lie somewhat further radially inward, ie would not interact with the inner wall of the tube as load-bearing sliding surface sections.
  • the groove extends in a straight line in the longitudinal direction of the piston from one end face of the same to the other end face and has a plurality of edge depressions at a distance from one another for securing a plurality of bearing rings of the same design.
  • the piston has two diametrically opposed, longitudinal grooves, and each bearing ring is provided with two diametrically opposed, inwardly projecting bulges.
  • the invention is based on a the drawing illustrated embodiment explained in detail.
  • the electromagnet has a movable armature in the form of a piston 1, which is connected to a concentrically arranged bumper 2.
  • the piston 1 is axially displaceably mounted in a multi-part magnet housing, which is designated as a whole by 3.
  • This has an end part 4, an intermediate tube 6 adjoining it axially and a pole tube 7 adjoining it axially.
  • the end part 4, the intermediate tube 6 and the pole tube 7 form with their inner walls a cylindrical surface which surrounds the piston 1, which is axially displaceably guided therein.
  • a magnetic winding 9 shown only broken off in FIG. 1 surrounds a large part of the end part 4, the intermediate tube 6 and the pole tube 7 over part of its length.
  • the latter has two identically designed bearing rings 11 which are made of a non-magnetic material, for example a sheet metal strip made of V2A steel, a brass alloy, a copper alloy or the like.
  • the latter has two grooves 13 of identical design, diametrically opposite one another, which are cut into the piston skirt and, in the exemplary embodiment, extend straight from one end face or end face 15 of the piston 1 in the direction of the piston longitudinal axis 14 extend to the other end surface 16.
  • Each bearing ring 11 is a one-piece, self-contained ring with two bulges 18 arranged diametrically opposite one another, which are of identical design and form radially inwardly projecting ribs, the apex line of which extends in the longitudinal direction of the grooves 13.
  • These have on their opposite, longitudinal side walls 21 and 22 edge depressions 23 which are formed by embossed rounding of the edge regions of the side walls 21 and 22, i.e. the areas in which the side walls 21 and 22 adjoin the outer surface of the piston 1.
  • These edge depressions have an axial length adapted to the width of the bearing rings 11 and form a seat into which the bearing ring in question snaps with the associated inner surfaces de the bulge 18 in question.
  • the circumferential length of the bearing rings 11 is dimensioned such that the bulges 18 engage the edge recesses 23 on the grooves 13 under pretension in order to axially secure the bearing rings 11.
  • a certain widening of the ring 11 is therefore necessary, the bulges 18 being widened slightly, this widening of the bulges 18 reducing again as soon as the bearing ring 11 on the associated edge depressions 23 on the groove 13 is aligned.
  • the bearing rings 11 are widened in the course of the assembly process, their slight deformation takes place only at the bulges 18, i.e.
  • the bearing rings 11 can preferably have a layer made of a non-magnetic, lubricious material with the lowest possible permeability, e.g. a fluorine-containing polymer, for example 0.1 mm to 0.2 mm thick.
  • the outer diameter of the piston 1 is chosen taking into account the strength of the bearing rings 11 located on it so that between the inner wall of the cylinder and the outside of the bearing rings 11 or, if applicable, their lubricious coating there is a play suitable for the sliding bearing of the piston 1.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Magnetic Bearings And Hydrostatic Bearings (AREA)
  • Electromagnets (AREA)

Description

Die Erfindung betrifft einen Elektromagneten, dessen Anker in der Art eines Kolbens ausgebildet und innerhalb eines Rohres längsverschiebbar geführt ist, das auf zumindest einem Teil seiner Länge von der Wicklung des Magneten umgeben ist, wobei der Kolben für seine verschiebbare Lagerung innerhalb des Rohres mindestens einen Lagerring aus einem elastischen, nichtmagnetischen Werkstoff trägt, der den Kolben im wesentlichen ringförmig umgibt, mit einer in die Außenseite des Kolbens eingearbeiteten Nut zusammenwirkt, gegen eine Bewegung relativ zur Nut durch den Eingriff zumindest einer radial nach einwärts gerichteten Auswölbung des Lagerringes in eine Gestaltsunregelmäßigkeit der Nut gesichert und zumindest an seiner mit der Wandung des Rohres zusammenwirkenden äußeren Gleitfläche einen gleitfähigen Werkstoff aufweist.The invention relates to an electromagnet, the armature of which is designed in the manner of a piston and is guided so as to be longitudinally displaceable within a tube which is surrounded by the winding of the magnet on at least part of its length, the piston for its displaceable mounting within the tube at least one bearing ring made of an elastic, non-magnetic material, which surrounds the piston substantially in a ring, cooperates with a groove machined into the outside of the piston, against movement relative to the groove by engaging at least one radially inward bulge of the bearing ring in a shape irregularity of the groove secured and has a lubricious material at least on its outer sliding surface interacting with the wall of the tube.

Ein Elektromagnet dieser Art ist bereits aus der DE-Gebrauchsmusterschrift 1 850887 bekannt. Der Lagerring ist bei dem bekannten Elektromagneten einteilig ausgebildet und geschlitzt, damit der Lagerring für den Montagevorgang aufgespreizt oder aufgebogen werden kann. Das Aufspreizen oder Aufbiegen des Rings ist unumgänglich, weil keine andere Möglichkeit besteht, den Lagerring in der umlaufenden Ringnut des Kolbens in Stellung zu bringen, wenn der Lagerring solche Abmessungen aufweist, daß er durch den Eingriff mit der Ringnut gegen axialesverschieben auf dem Kolben gesichert ist.An electromagnet of this type is already known from DE utility model 1 850887. The bearing ring is formed in one piece and slotted in the known electromagnet so that the bearing ring can be spread or bent open for the assembly process. The spreading or bending of the ring is unavoidable because there is no other way to position the bearing ring in the circumferential ring groove of the piston if the bearing ring has dimensions such that it is secured against axial displacement on the piston by engagement with the ring groove .

Bei dem bekannten Magneten ergibt sich nicht nur die Notwendigkeit, für den Lagerring einen teueren Werkstoff mit guten Elastizitätseigenschaften vorzusehen, sondern es besteht darüber hinaus auch die Gefahr, daß eine äußere Beschichtung des Lagerringes mit einem gleitfähigen Werkstoff beim Montagevorgang rissig werden oder gar abplatzen kann, wenn der Ring aufgespreizt oder aufgebogen wird.In the case of the known magnet, there is not only the need to provide an expensive material with good elastic properties for the bearing ring, but there is also the risk that an outer coating of the bearing ring with a lubricious material may become cracked or even flake off during the assembly process, when the ring is spread or bent open.

Der Erfindung liegt die Aufgabe zugrunde, einen Elektromagneten zu schaffen, bei dem der Lagerring ohne eine störende Verformung auf dem als Anker dienenden Kolben in Stellung gebracht werden kann.The invention has for its object to provide an electromagnet in which the bearing ring can be brought into position on the piston serving as an anchor without a disturbing deformation.

Diese Aufgabe ist erfindungsgemäß bei einem Elektromagneten der eingangs genannten Art dadurch gelöst, daß die Nut, von einer Endfläche des Kolbens ausgehend, sich über zumindest einen Teil der, bezogen auf die Längsachse des Rohres, axialen Länge des Kolbens und quer zur Zentralebene des Lagerringes erstreckt, daß der Lagerring in sich geschlossen ist, so daß die Auswölbung die Form einer ungeteilten, sich in Längsrichtung der Nut erstrekkenden Rippe besitzt, deren Bereite auf diejenige der Nut abgestimmt ist, und daß zur Bildung der mit der Auswölbung des Lagerringes zusammenwirkenden Gestaltsunregelmäßigkeit wenigstens eine der beiden einander gegenüberliegenden Längswände der Nut auf einer der Breite des Lagerringes angepaßten Länge im Bereich des Übergangs zur angrenzenden Mantelfläche des Kolbens unter Ausbildung einer Randvertiefung abgerundet ist, in der der Lagerring gegen axiales Verschieben auf dem Kolben gesichert ist.This object is achieved in an electromagnet of the type mentioned above in that the groove, starting from an end face of the piston, extends over at least part of the axial length of the piston, based on the longitudinal axis of the tube, and transversely to the central plane of the bearing ring that the bearing ring is self-contained so that the bulge is in the form of an undivided rib extending in the longitudinal direction of the groove, the width of which is coordinated with that of the groove, and that at least one to form the irregularity in shape interacting with the bulging of the bearing ring the two opposing longitudinal walls of the groove are rounded to a length adapted to the width of the bearing ring in the region of the transition to the adjacent lateral surface of the piston to form an edge recess in which the bearing ring is secured against axial displacement on the piston.

Dadurch, daß die Nut, im Gegensatz zu der Ringnut bei der bekannten Lösung, zur Endfläche des Kolbens hin offen ist, läßt sich der für den Eingriff in die Nutvorgesehene Teil des Lagerrings von der Endfläche des Kolbens her in die Nut einschieben, ohne daß der in die Nut eingreifende Ringteil über nicht vertiefte Bereiche des Kolbenmantels gehoben zu werden braucht, wie dies beim Einsetzen eines geschlitzten Ringes in eine Ringnut eines Kolbens erforderlich ist. Bei der erfindungsgemäß ferner vorgesehenen Ausbildung des in die Nut eingreifenden Teiles des Ringes in Form einer nach einwärts vorspringenden Auswölbung des Ringes, die in eine an der Nut vorgesehene Randvertiefung eingreift, die durch Abrunden der Kanten der einander gegenüberliegenden Längswände der Nut gebildet ist, ist es möglich, den Lagerring als in sich geschlossenen, also nicht geschlitzten Ring auszubilden. Beim Montagevorgang braucht der geschlossene Ring durch geringfügiges Ausziehen der Auswölbung nur so weit aufgeweitet zu werden, daß er über die Mantelfläche des Kolbens so weit axiale verschoben werden kann, bis die Ränder der Auswölbung auf die Randvertiefungen der Nut ausgerichtet sind und es aufgrund der Elastizität des Rings zu einem Einschnappen und damit zur Bildung einer Sicherung gegen axiales Verschieben des Ringes kommt.Because the groove, in contrast to the annular groove in the known solution, is open towards the end face of the piston, the part of the bearing ring intended for engagement in the groove can be inserted into the groove from the end face of the piston without the ring part engaging in the groove needs to be lifted over non-recessed areas of the piston skirt, as is required when inserting a slotted ring into an annular groove of a piston. In the case of the inventive design of the part of the ring engaging in the groove in the form of an inwardly projecting bulge of the ring, which engages in an edge recess provided on the groove, which is formed by rounding off the edges of the opposing longitudinal walls of the groove, it is possible to form the bearing ring as a self-contained, not slotted ring. During the assembly process, the closed ring needs to be widened only slightly by slightly pulling out the bulge so that it can be moved axially over the lateral surface of the piston until the edges of the bulge are aligned with the edge depressions of the groove and it is due to the elasticity of the Ring snaps into place and thus forms a safeguard against axial displacement of the ring.

Bei der Erfindung ist beim Montagevorgang des geschlossenen Lagerringes die Verformung desselben so gering, daß bei Vorhandensein einer gleitfähigen Beschichtung auf der Außenseite des Lagerrings eine Baschädigung der gleitfähigen Schicht nicht zu befürchten ist. Da die Verformung außerdem nur an der Auswölbung auftritt, die beim Aufweiten des Lagerrings etwas ausgezogen wird, würde selbst bei einer Beschädigung der Beschichtung an den verformten Stellen keine Gefahr einer Betriebsstörung bestehen, weil diese beschädigten Stellen innerhalb des Bereichs der Randvertiefungen der Nut gegenüber dem Außendurchmesser des Lagerrings radial etwas weiter innen liegen würden, also nicht als tragende Gleitflächenabschnitte mit der Innenwandung des Rohres zusammenwirken würden.In the invention, the deformation of the closed bearing ring during the assembly process of the same is so slight that there is no fear of damage to the base of the sliding layer if a lubricious coating is present on the outside of the bearing ring. In addition, since the deformation only occurs at the bulge, which is slightly pulled out when the bearing ring is widened, there would be no risk of malfunction even if the coating was damaged at the deformed locations, because these damaged locations lie within the region of the edge depressions of the groove relative to the outer diameter of the bearing ring would lie somewhat further radially inward, ie would not interact with the inner wall of the tube as load-bearing sliding surface sections.

Bei einem vorteilhaften Ausführungsbeispiel gemäß Anspruch 2 erstreckt sich die Nut in der Längsrichtung des Kolbens geradlinig von der einen Endfläche desselben zur anderen Endfläche hin durchgehend und weist für die Sicherung mehrerer gleich ausgebildeter Lagerringe im Abstand voneinander mehrere Randvertiefungen auf.In an advantageous embodiment according to claim 2, the groove extends in a straight line in the longitudinal direction of the piston from one end face of the same to the other end face and has a plurality of edge depressions at a distance from one another for securing a plurality of bearing rings of the same design.

Bei einem weiteren vorteilhaften Ausführungsbeispiel gemäß Anspruch 3 weist der Kolben zwei zueinander diametral gegenüberliegend angeordnete, längsverlaufende Nuten auf, und jeder Lagerring ist mit zwei zueinanderdiametral gegenüberliegend angeordneten, nach einwärts vorspringenden Auswölbungen versehen.In a further advantageous embodiment according to claim 3, the piston has two diametrically opposed, longitudinal grooves, and each bearing ring is provided with two diametrically opposed, inwardly projecting bulges.

Die Erfindung wird nachstehend anhand eines in der Ziechnung dargestellten Ausführungsbeispiels im einzelnen erläutert.The invention is based on a the drawing illustrated embodiment explained in detail.

Es zeigen:

  • Fig. 1 einen teils abgebrochen dargestellten, zentralen Längsschnitt nur des inneren Teils eines Ausführungsbeispiels des Elektromagneten;
  • Fig. 2 eine demgegenüber im größeren Maßstab und teils abgebrochen gezeichnete Draufsicht des als Anker dienenden Kolbens des Ausführungsbeispiels und
  • Fig. 3 eine teils aufgeschnitten gezeichnete Vorderansicht des Kolbens von fig. 2.
Show it:
  • Figure 1 is a partially broken, central longitudinal section of only the inner part of an embodiment of the electromagnet.
  • Fig. 2 is a larger scale and partly broken plan view of the piston serving as an anchor of the embodiment and
  • Fig. 3 is a partially cut front view of the piston of fig. 2nd

Der Elektromagnet weist einen beweglichen Anker in Form eines Kolbens 1 auf, der mit einer konzentrisch angeordneten Stoßstange 2 verbunden ist. Der Kolben 1 ist axial verschiebbar in einem mehrteiligen Magnetgehäuse gelagert, das als Ganzes mit 3 bezeichnet ist. Dieses weist einen Endteil 4, ein sich an diesen axial anschließendes Zwischenrohr 6 und ein sich an dieses wiederum axial anschließendes Polrohr 7 auf. Der Endteil 4, das Zwsichenrohr 6 und das Polrohr 7 bilden mit ihren Innenwandungen eine Zylinderfläche, die den in ihnen axial verschiebbar geführten Kolben 1 umgint. Eine nur in Fig. 1 abgebrochen dargestellte Magnetwicklung 9 umgibt Großteil des Endteils 4, das Zwischenrohr 6 sowie das Polrohr 7 auf einem Teil seiner Länge.The electromagnet has a movable armature in the form of a piston 1, which is connected to a concentrically arranged bumper 2. The piston 1 is axially displaceably mounted in a multi-part magnet housing, which is designated as a whole by 3. This has an end part 4, an intermediate tube 6 adjoining it axially and a pole tube 7 adjoining it axially. The end part 4, the intermediate tube 6 and the pole tube 7 form with their inner walls a cylindrical surface which surrounds the piston 1, which is axially displaceably guided therein. A magnetic winding 9 shown only broken off in FIG. 1 surrounds a large part of the end part 4, the intermediate tube 6 and the pole tube 7 over part of its length.

Zur Bildung der Gleitlagerung für den Kolben 1 weist dieser zwei gleich ausgebildete Lagerringe 11 auf, die aus einem nichtmagnetischen Werkstoff gefertigt sind, beispielsweise einem Blechstreifen aus V2A-Stahl, einer Messinglegierung, einer Kupferlegierung oder dergleichen. Zur Lagefixierung der Lagerringe 11 auf dem Kolben 1 weist dieser zwei gleich ausgebildete, einander diametral gegenüberliegende Nuten 13 auf, die in den Kolbenmantel eingeschnitten sind und sich beim Ausführungsbeispiel in der Richtung der Kolbenlängsachse 14 geradlinig von der einen Stirnfläche oder Endfläche 15 des Kolbens 1 durchgehend zur anderen Endfläche 16 erstrekken.To form the sliding bearing for the piston 1, the latter has two identically designed bearing rings 11 which are made of a non-magnetic material, for example a sheet metal strip made of V2A steel, a brass alloy, a copper alloy or the like. To fix the position of the bearing rings 11 on the piston 1, the latter has two grooves 13 of identical design, diametrically opposite one another, which are cut into the piston skirt and, in the exemplary embodiment, extend straight from one end face or end face 15 of the piston 1 in the direction of the piston longitudinal axis 14 extend to the other end surface 16.

Jeder Lagerring 11 ist ein einteiliger, in sich geschlossener Ring mit zwei zueinander diametral gegenüberliegend angeordneten Auswölbungen 18, die gleich gestaltet sind und radial nach einwärts vorspringende Rippen bilden, deren Scheitellinie in Längsrichtung der Nuten 13 verläuft. Diese weisen an ihren einander gegenüberliegenden, längsverlaufenden Seitenwänden 21 und 22 Randvertiefungen 23 auf, die durch eingeprägte Abrundungen der Kantenbereiche der Seitenwände 21 und 22 gebildet sind, d.h. der Bereiche, in denen die Seitenwände 21 und 22 an die Mantelfläche des Kolbens 1 angrenzen. Diese Randvertiefungen haben eine der Breite der Lagerringe 11 angepaßte axiale Länge und bilden einen Sitz, in den der betreffende Lagerring mit den zugeordneten Innenflächen de betreffenden Auswölbung 18 einschnappt. Die Umfangslänge der Lagerringe 11 ist dabei so bemessen, daß die Auswölbungen 18 unter Vorspannung in die Randvertiefungen 23 an den Nuten 13 eingreifen, um die Lagerringe 11 axial zu sichern. Beim Aufschieben des Lagerringes 11 auf den Kolben 1 ist daher ein gewisses Aufweiten des Ringes 11 erforderlich, wobei die Auswölbungen 18.geringfügig aufgeweitet werden, wobei sich dieses Aufweiten der Auswölbungen 18 wieder verringert, sobald der Lagerring 11 auf die zugehörigen Randvertiefungen 23 an der Nut 13 ausgerichtet ist. Bei dem Aufweiten der Lagerringe 11 im Zuge des Montagevorganges findet deren geringfügige Verformung lediglich an den Auswölbungen 18 statt, also in Abschnitten, in denen die Außenfläche des Lagerringes 11 aufgrund des Vorhandenseins der Nuten 13 und der Randvertiefungen 23 radial weiter innen liegt als in den übrigen Umfangsbereichen der Lagerringe 11. Fals es daher trotz der nur geringen Verformung der Ringe 11 wider Erwarten zu einer Beeinträchtigung einer gegebenenfalls auf dem betreffenden Ring 11 befindlichen, gleitfähigen Beschichtung kommen sollte, befindet sich demgemäß diese Beschädigung an einer nichttragenden Stelle des Umfanges des Ringes 11, so daß keine Beeinträchtigung des Betriebsverhaltens zu befürchten ist.Each bearing ring 11 is a one-piece, self-contained ring with two bulges 18 arranged diametrically opposite one another, which are of identical design and form radially inwardly projecting ribs, the apex line of which extends in the longitudinal direction of the grooves 13. These have on their opposite, longitudinal side walls 21 and 22 edge depressions 23 which are formed by embossed rounding of the edge regions of the side walls 21 and 22, i.e. the areas in which the side walls 21 and 22 adjoin the outer surface of the piston 1. These edge depressions have an axial length adapted to the width of the bearing rings 11 and form a seat into which the bearing ring in question snaps with the associated inner surfaces de the bulge 18 in question. The circumferential length of the bearing rings 11 is dimensioned such that the bulges 18 engage the edge recesses 23 on the grooves 13 under pretension in order to axially secure the bearing rings 11. When the bearing ring 11 is pushed onto the piston 1, a certain widening of the ring 11 is therefore necessary, the bulges 18 being widened slightly, this widening of the bulges 18 reducing again as soon as the bearing ring 11 on the associated edge depressions 23 on the groove 13 is aligned. When the bearing rings 11 are widened in the course of the assembly process, their slight deformation takes place only at the bulges 18, i.e. in sections in which the outer surface of the bearing ring 11 is located radially further inwards than in the rest due to the presence of the grooves 13 and the edge depressions 23 Circumferential areas of the bearing rings 11. If, contrary to expectations, a slippery coating that may be present on the ring 11 in question should be impaired despite the only slight deformation of the rings 11, this damage is accordingly located at a non-load-bearing point on the circumference of the ring 11. so that there is no fear of impairment of the operating behavior.

Also gleitfähige Schicht können die Lagerringe 11 auf ihrer Außenseite vorzugsweise eine Schicht aus einem nichtmagnetischen, gleitfähigen Werkstoff möglichst niederer Permeabilität, z.B. einem fluorhaltigen Polymer von beispielsweise 0,1 mm bis 0,2 mm Dicke, aufweisen. Dabei ist der Außendurchmesser des Kolbens 1 unter Berücksichtigung der Stärke der auf ihm befindlichen Lagerringe 11 so gewählt, daß zwischen der Innenwandung des Zylinders und der Außenseite der Lagerringe 11 oder gegebenenfalls deren gleitfähiger Beschichtung ein für die Gleitlagerung des Kolbens 1 geeignetes Spiel gegeben ist.Thus, a lubricious layer, the bearing rings 11 can preferably have a layer made of a non-magnetic, lubricious material with the lowest possible permeability, e.g. a fluorine-containing polymer, for example 0.1 mm to 0.2 mm thick. The outer diameter of the piston 1 is chosen taking into account the strength of the bearing rings 11 located on it so that between the inner wall of the cylinder and the outside of the bearing rings 11 or, if applicable, their lubricious coating there is a play suitable for the sliding bearing of the piston 1.

Claims (4)

1. Electromagnet, whereof the armature is constructed in the manner of a piston and is guided to move longitudinally within a tube, which is surrounded over at least part of its length by the winding of the magnet, for its displaceable mounting within the tube, the piston supporting at least one bearing ring consisting of a resilient, non-magnetic material, which surrounds the piston in a substantially annular manner, cooperates with a groove cut in the outer side of the piston, is prevented from moving relative to the groove by the engagement of at least one bulge of the bearing ring directed radially inwards in a structural irregularity of the groove and at least on its outer sliding surface co-operating with the wall of the tube comprises a slideable material, characterised in that the groove (13), starting from one end face (15 or 16) of the piston (1), extends over at least part of the axial length of the piston with respect to the longitudinal axis (14) of the tube (4, 6, 7) and transversely with respect to the central plane of the bearing ring (11), that the bearing ring is closed, so that the bulge (18) has the shape of an undivided rib extending in the longitudinal direction of the groove (13), the width of which is matched to that of the groove and that in order to form the structural irregularity co-operating with the bulge (18) of the bearing ring, at least one of the two opposing longitudinal walls (21 and 22) of the groove (13) is rounded-off over a length adapted to the width of the bearing ring (11), in the region of the transition to the adjoining surface of the piston (1), with the formation of a marginal recess (23), in which the bearing ring (11) is prevented from moving axially on the piston (1).
2. Electromagnet according to Claim 1, characterised in that the groove (13) extends in the longitudinal direction of the piston (1) in a straight line from one end face (15) thereof to the other end face (16) in a continuous manner and for securing several bearing rings (11) having an identical construction, comprises several marginal recesses (23) which are spaced apart.
3. Electromagnet according to Claim 1 or 2, characterised in that the piston (1) comprises two grooves (13) arranged diametrically opposite each other and extending longitudinally, that each bearing ring (11) is provided with two bulges 18 arranged diametrically opposite each other and projecting inwards and that each groove (13) for each bearing ring (11) comprises two rounded marginal recesses (23).
4. Electromagnet according to one of Claims 1 to 3, characterised in that the width of the grooves (13) and of the inwardly projecting bulges (18), the depth of the marginal recesses (23) of the grooves (13) and the peripheral length of the bearing rings (11) are chosen so that the bulges (18) thereof bear with resilient pretension against the rounded edges of the respective marginal recesses (23).
EP86110477A 1985-07-31 1986-07-29 Electromagnet Expired - Lifetime EP0210650B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3527423 1985-07-31
DE19853527423 DE3527423A1 (en) 1985-07-31 1985-07-31 ELECTROMAGNET

Publications (2)

Publication Number Publication Date
EP0210650A1 EP0210650A1 (en) 1987-02-04
EP0210650B1 true EP0210650B1 (en) 1990-05-16

Family

ID=6277277

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86110477A Expired - Lifetime EP0210650B1 (en) 1985-07-31 1986-07-29 Electromagnet

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US (1) US4677410A (en)
EP (1) EP0210650B1 (en)
JP (1) JPS6242502A (en)
DE (2) DE3527423A1 (en)

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DE4224754A1 (en) * 1992-07-27 1994-02-03 Budig Peter Klaus Prof Dr Sc T Electromagnetic linear short-stroke actuator - has armature bearings formed to cooperate with guides to allow linear movement of armature relative to stator
US5986530A (en) * 1998-01-13 1999-11-16 Caterpillar Inc. Solenoid and method for manufacturing
DE19801529C2 (en) * 1998-01-16 2001-02-08 Hans Ulrich Bus Electromagnetic drive
DE10218445A1 (en) * 2002-04-25 2003-11-06 Bosch Rexroth Ag Rotary armature for electromagnetic actuators has a cylindrical shape with raised bearing sections formed by pressing of magnetic powder
CN100419280C (en) * 2006-04-30 2008-09-17 钱澄 Combined magnetic ring
DE102010042118A1 (en) * 2010-10-07 2012-04-12 Robert Bosch Gmbh Slide bearing, method for producing a plain bearing and use of a sliding bearing
DE102014108700A1 (en) * 2014-06-20 2015-12-24 Hilite Germany Gmbh Central actuator for a Schwenkmotorversteller a camshaft
EP2993674A1 (en) * 2014-09-02 2016-03-09 Husco Automotive Holdings LLC Solenoid with magnetic tube and armature stabilizing element, and methods of making and using the same
EP3557594B1 (en) * 2018-04-19 2021-11-10 HUSCO Automotive Holdings LLC Solenoid having a dimpled armature tube
JP2020053618A (en) * 2018-09-28 2020-04-02 日本電産トーソク株式会社 solenoid
CN113531191A (en) * 2021-07-14 2021-10-22 杭州群科荟科技有限公司 Air gap magnetic conduction structure and gas solenoid valve thereof

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Also Published As

Publication number Publication date
DE3671322D1 (en) 1990-06-21
DE3527423C2 (en) 1989-12-21
EP0210650A1 (en) 1987-02-04
US4677410A (en) 1987-06-30
JPS6242502A (en) 1987-02-24
DE3527423A1 (en) 1987-02-12

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