EP0840333A1 - Switching device with displacement sensor - Google Patents

Switching device with displacement sensor Download PDF

Info

Publication number
EP0840333A1
EP0840333A1 EP97110616A EP97110616A EP0840333A1 EP 0840333 A1 EP0840333 A1 EP 0840333A1 EP 97110616 A EP97110616 A EP 97110616A EP 97110616 A EP97110616 A EP 97110616A EP 0840333 A1 EP0840333 A1 EP 0840333A1
Authority
EP
European Patent Office
Prior art keywords
switching
switching device
spring
displacement sensor
fixing part
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.)
Granted
Application number
EP97110616A
Other languages
German (de)
French (fr)
Other versions
EP0840333B1 (en
Inventor
Martin Dipl.-Ing. Bill
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.)
Hydac Electronic GmbH
Original Assignee
BSO Steuerungstechnik 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 BSO Steuerungstechnik GmbH filed Critical BSO Steuerungstechnik GmbH
Publication of EP0840333A1 publication Critical patent/EP0840333A1/en
Application granted granted Critical
Publication of EP0840333B1 publication Critical patent/EP0840333B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • H01F7/1607—Armatures entering the winding

Definitions

  • the invention relates to a switching device, in particular in the form of a switching magnet with a displacement pickup device for monitoring the position of a switching part of the switching device, which can be coupled to the displacement pickup device via a releasable connecting device.
  • switching devices (DE 43 41 087 C2) with displacement transducers are freely available on the market in a large number of embodiments, the switching device being a so-called direct current or alternating current switching magnet.
  • the switching part Via a coil part of the switching device, the switching part can usually be moved in the form of a tubular bolt when the coil is electrically actuated within the switching magnet, for example to trigger a switching process in a fluid valve or the like.
  • the position transducer device can not only detect the end positions of the switching part, but also continuously intermediate positions, so that the switching state of the switching device can be monitored in any switching state via an electronic evaluation unit.
  • the switching part in the form of the switching pin has a type Dipstick, which can be moved together with the switching part and thereby changes the inductance of a coil arrangement within the displacement transducer device, depending on its depth of penetration into the coil arrangement, so that information about the position of the switching part is obtained.
  • a releasable connecting device for the coupling of the switching device with the displacement transducer device, a releasable connecting device is provided which, in the prior art, consists of grub screws or the like which, arranged on the outer circumference of the displacement transducer device, engage in associated recesses in the switching device.
  • the connection device in question is expensive to manufacture and complicates the assembly of the overall device, since the components of the switching device and displacement sensor device must be pre-positioned in relation to one another for the screwing in of the grub screws.
  • the invention has for its object to provide a switching device with displacement sensor that can be easily and inexpensively connected together to form a structural unit.
  • a relevant object is achieved by a switching device with a displacement sensor device according to the features of claim 1.
  • the connecting device has a spring-elastic connecting part which passes through one device and encompasses the other device, the coupling of switching device with displacement sensor device can be achieved with only one component in the form of the spring-elastic connecting part.
  • This is not only inexpensive, but the connection in question can also be easily achieved and also released again without precise prepositioning of the respective device in relation to one another.
  • the coupling caused by the spring-elastic connecting part leads to a secure axial connection of the Devices with each other, whereby there can be no unintentional loosening of the connection.
  • the connecting part is a bow spring with two leg pieces which can be moved elastically relative to one another and which encompass the switching device, the connecting part preferably being formed from a non-magnetic spring steel wire.
  • the displacement transducer device preferably has a groove-shaped recess for the flush engagement of the bow spring
  • the leg pieces at least on their mutually facing inner sides, having an arcuate receptacle for receiving a rotationally symmetrical fixing part of the switching device, and this fixing part has a wedge-shaped recess
  • the fixing part can have a securing part along its outer circumference, in particular in the form of knurling, so that after the connection part engages in the displacement transducer device, a secure positive-locking connection is provided both in the radial and in the axial direction.
  • the switching device designated as a whole by 10 according to FIG. 1 has a coil former 12 made of plastic material.
  • the end of the coil body 12 has two annular flanges, between which the winding package 14 of a conductor extends, which is shown only schematically in FIG. 1.
  • a so-called pole tube 16 is guided in the coil former 10, in which a bolt-shaped switching part 18, which is in turn arranged to be longitudinally movable, can be moved counter to the spring force of a compression spring 20.
  • An actuating rod 22 is arranged centrally at a free end of the switching part 18, whereas at the opposite end of the switching part 18 it also has a measuring rod 24 in the center.
  • the actuating rod 22 is used to control a valve body, whereas the measuring rod 24 is used to check the switching position of the switching part 18 and thus the actuating rod 22, which in turn provides information about the actuation state of the valve.
  • the switching device 10 also has an electrical connection point 26 in the form of a contact plug for the purpose of connection to a controllable current source (not shown).
  • the relevant structure of a switching device 10 is known in the prior art. If the winding package 14 of the bobbin 12 is electrically excited, it is seen under the influence of the field that arises as seen in FIG. 1, the switching part 18 moves against the restoring force of the compression spring 20 to the left against the compression spring in the valve, the actuating rod 22 retracts to the right by the travel distance of the switching part 18 in a corresponding manner.
  • the movement of the measuring rod 24 of the switching part 18 triggered in this way causes a change in the field in the coil winding of the coil body 28 to take place as a whole 30 designated displacement sensor device, which can also be composed of several individual coils (not shown).
  • the relevant signal change is passed on electrically via corresponding connecting lines of the coil body 28 to a device connector 32 to which an electronic evaluation unit (not shown) can be connected.
  • the relevant structure of a displacement transducer device is also known in a wide variety of embodiments in the prior art.
  • the measuring rod 24 is radially surrounded by a receiving sleeve 34, which is a pressure-tight tube and on the outer circumferential side forms a contact surface for the coil system 28, which can be pushed onto the receiving sleeve 34 against the spring force of an adjusting spring 36.
  • a hexagon nut 38 and a spacer sleeve 40 can then - also by the customer - carry out a "mechanical" zero point adjustment for the displacement transducer 30.
  • the receiving sleeve 34 is closed at its end facing the environment and is dimensioned so long that the measuring rod 24 has a free travel length within the receiving sleeve 34 in every position of the switching part 18.
  • the receiving sleeve 34 has a widening 42, via which it is fixedly connected to a sleeve-like fixing part 44 along the inside thereof.
  • the fixing part 44 which serves as a closure part, is fixedly connected to the pole tube 16 and is essentially part of the same.
  • the fixing part 44 On its side facing the switching device 10, the fixing part 44 has a support surface for the compression spring 20 already mentioned. Furthermore, it has a central recess for the free passage of the measuring rod 24 of the switching part 18. On the outer circumference, the usual round seals are inserted in the ring grooves of the fixing part 44.
  • the pole tube 16 is provided with a bead at its end facing the displacement transducer device 30. Furthermore, the fixing part 44 forms a contact surface for the adjusting spring 36 and is over a shoulder Spacer tube 46 of the displacement sensor 30 in contact with the fixing part 44.
  • the fixing part 44 is surrounded by a push-on sleeve 48 of the displacement sensor 30, which also partially surrounds the pole tube 16 radially, and connects to the actual switching device 10 on the end face.
  • the push-on sleeve 48 forming a displacement sensor housing releases an annular channel for a sealing ring 50 between the pole tube 16 and the push-on sleeve 48.
  • the push-on sleeve 48 is provided on the outer circumferential side with recessed grips 52 which facilitate handling, in particular the attachment of the displacement sensor device 30 during assembly on the protruding parts of the switching device 10.
  • the fixing part 44 has a wedge-shaped recess 54, the inclination of the wedge of the recess 54 extending transversely to the direction of movement of the switching part 18 and the free opening cross section decreasing in the direction of the switching part 18. Seen in the axial direction, the wedge-shaped recess 44 can be used to achieve a play-free connection of the switching device 10 with the displacement transducer device 30 via a connecting device in the form of a spring-elastic connecting part 56, as is shown in detail in FIG. 2.
  • the resilient connecting part 56 shown in FIG. 2 consists of a bow spring 58 with two resiliently movable leg pieces 60 which encompass the switching device 10 at the location of the rotationally symmetrical fixing part 44 approximately in the center.
  • the connecting part 56 is formed from a non-magnetic spring steel wire. However, it can also be formed from a magnetizable spring steel wire.
  • the displacement sensor device 30 has a groove-shaped recess 62.
  • the two leg pieces 60 each have an arcuate on their mutually facing inner sides Receptacle 64 on for engagement in the wedge-shaped recess 54 of the fixing part 44.
  • the free ends of the bow spring 58 are, as shown in particular in FIG on.
  • the leg pieces 56 are also connected to one another via an arcuate central piece 66 of the bow spring 58.
  • the curvature of the arc-shaped receiving pieces 64 essentially correspond to the outer circumferential curvature of the fixing part 44.
  • the fixing part 44 also has, along its outer circumference in the axial direction, to the side next to the wedge-shaped recess 54, a securing part 68 in the form of knurling, which is used for the rotationally secure connection to the displacement transducer device, which has a corresponding engagement part 70 for connection to the securing part 68 .
  • this also provides an anti-rotation device which on the one hand facilitates the adjustment when the push-on sleeve 48 and thus the displacement sensor device 30 is placed on the switching device 10 and on the other hand ensures a radial position securing in later operation.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
  • Feeding And Watering For Cattle Raising And Animal Husbandry (AREA)

Abstract

The switch mechanism is preferably in the form of a magnetic switch with a direction detection device for monitoring the position of a switch element (10) of the mechanism (10) which is coupled to the path detector (30) via a releasable connection device. The connection device has a spring elastic connection part (56) which passes through one of the detector (30) and the switch mechanism (10) and engages with the other. The connector part (56) is preferably a stirrup spring with two legs movable under spring force relative to each other. The legs engage the switch mechanism. The connector part (56) may be formed of a sprung steel wire.

Description

Die Erfindung betrifft eine Schaltvorrichtung, insbesondere in Form eines Schaltmagneten mit einer Wegaufnehmervorrichtung zur Überwachung der Position eines Schaltteiles der Schaltvorrichtung, die mit der Wegaufnehmervorrichtung über eine lösbare Verbindungseinrichtung koppelbar ist.The invention relates to a switching device, in particular in the form of a switching magnet with a displacement pickup device for monitoring the position of a switching part of the switching device, which can be coupled to the displacement pickup device via a releasable connecting device.

Dahingehende Schaltvorrichtungen (DE 43 41 087 C2) mit Wegaufnehmervorrichtung sind in einer Vielzahl von Ausführungsformen auf dem Markt frei erhältlich, wobei die Schaltvorrichtung einen sogenannten Gleichstrom- oder Wechselstromschaltmagneten darstellt. Über ein Spulenteil der Schaltvorrichtung läßt sich das Schaltteil üblicherweise in Form eines rohrförmigen Bolzens bei elektrischer Ansteuerung der Spule innerhalb des Schaltmagneten verfahren, um beispielsweise einen Schaltvorgang bei einem Fluidventil oder dergl. auszulösen. Mittels der Wegaufnehmervorrichtung lassen sich bei modernen Systemen nicht nur die Endstellungen des Schaltteiles erfassen, sondern auch kontinuierlich Zwischenstellungen, so daß über eine elektronische Auswerteeinheit der Schaltzustand der Schaltvorrichtung sich in jedem Schaltzustand überwachen läßt. Das Schaltteil in Form des Schaltbolzens weist dabei eine Art Meßstab auf, der zusammen mit dem Schaltteil verfahrbar ist und dabei die Induktivität einer Spulenanordnung innerhalb der Wegaufnehmervorrichtung verändert, und zwar in Abhängigkeit seiner Eindringtiefe in die Spulenanordnung, so daß man hierüber Aufschluß erhält über die Lageposition des Schaltteiles.Such switching devices (DE 43 41 087 C2) with displacement transducers are freely available on the market in a large number of embodiments, the switching device being a so-called direct current or alternating current switching magnet. Via a coil part of the switching device, the switching part can usually be moved in the form of a tubular bolt when the coil is electrically actuated within the switching magnet, for example to trigger a switching process in a fluid valve or the like. In modern systems, the position transducer device can not only detect the end positions of the switching part, but also continuously intermediate positions, so that the switching state of the switching device can be monitored in any switching state via an electronic evaluation unit. The switching part in the form of the switching pin has a type Dipstick, which can be moved together with the switching part and thereby changes the inductance of a coil arrangement within the displacement transducer device, depending on its depth of penetration into the coil arrangement, so that information about the position of the switching part is obtained.

Für die Kopplung der Schaltvorrichtung mit der Wegaufnehmervorrichtung ist eine lösbare Verbindungseinrichtung vorgesehen, die im Stand der Technik aus Madenschrauben od. dgl. besteht, die außenumfangsseitig an der Wegaufnehmervorrichtung angeordnet in zugeordnete Ausnehmungen in der Schaltvorrichtung eingreifen. Die dahingehende Verbindungseinrichtung ist teuer in der Herstellung und erschwert den Zusammenbau der Gesamtvorrichtung, da für das Eindrehen der Madenschrauben die Bauteile Schaltvorrichtung und Wegaufnehmervorrichtung genau zueinander vorpositioniert sein müssen.For the coupling of the switching device with the displacement transducer device, a releasable connecting device is provided which, in the prior art, consists of grub screws or the like which, arranged on the outer circumference of the displacement transducer device, engage in associated recesses in the switching device. The connection device in question is expensive to manufacture and complicates the assembly of the overall device, since the components of the switching device and displacement sensor device must be pre-positioned in relation to one another for the screwing in of the grub screws.

Ausgehend von diesem Stand der Technik liegt der Erfindung die Aufgabe zugrunde, eine Schaltvorrichtung mit Wegaufnehmervorrichtung zu schaffen, die sich einfach und kostengünstig miteinander zu einer Baueinheit verbinden lassen. Eine dahingehende Aufgabe löst eine Schaltvorrichtung mit Wegaufnehmervorrichtung gemäß den Merkmalen des Anspruches 1.Based on this prior art, the invention has for its object to provide a switching device with displacement sensor that can be easily and inexpensively connected together to form a structural unit. A relevant object is achieved by a switching device with a displacement sensor device according to the features of claim 1.

Dadurch, daß gemäß dem kennzeichnenden Teil des Anspruches 1 die Verbindungseinrichtung ein federelastisches Verbindungsteil aufweist, das eine Vorrichtung durchgreift und die andere Vorrichtung umgreift, läßt sich mit nur einem Bauteil in Form des federelastischen Verbindungsteils die Kopplung von Schaltvorrichtung mit Wegaufnehmervorrichtung erreichen. Dies ist nicht nur kostengünstig, sondern die dahingehende Verbindung läßt sich auch ohne genaue Vorpositionierung der jeweiligen Vorrichtung zueinander einfach erreichen und auch wieder lösen. Die über das federelastische Verbindungsteil hervorgerufene Kopplung führt zu einer sicheren axialen Verbindung der Vorrichtungen miteinander, wobei es nicht zu einem unbeabsichtigten Lösen der Verbindung kommen kann.Characterized in that according to the characterizing part of claim 1, the connecting device has a spring-elastic connecting part which passes through one device and encompasses the other device, the coupling of switching device with displacement sensor device can be achieved with only one component in the form of the spring-elastic connecting part. This is not only inexpensive, but the connection in question can also be easily achieved and also released again without precise prepositioning of the respective device in relation to one another. The coupling caused by the spring-elastic connecting part leads to a secure axial connection of the Devices with each other, whereby there can be no unintentional loosening of the connection.

Bei einer besonders bevorzugten Ausführungsform ist das Verbindungsteil eine Bügelfeder mit zwei federelastisch zueinander bewegbaren Schenkelstücken, die die Schaltvorrichtung umgreifen, wobei vorzugsweise das Verbindungsteil aus einem nichtmagnetischen Federstahldraht gebildet ist.In a particularly preferred embodiment, the connecting part is a bow spring with two leg pieces which can be moved elastically relative to one another and which encompass the switching device, the connecting part preferably being formed from a non-magnetic spring steel wire.

Sofern vorzugsweise die Wegaufnehmervorrichtung eine nutförmige Ausnehmung für den bündigen Eingriff der Bügelfeder aufweist, wobei die Schenkelstücke zumindest an ihren einander zugewandten Innenseiten ein bogenförmiges Aufnahmestück für die Aufnahme eines rotationssymmetrischen Festlegeteiles der Schaltvorrichtung aufweisen, und dieses Festlegeteil über eine keilförmige Ausnehmung verfügt, ist eine spielfreie Kopplung von Schaltvorrichtung mit Wegaufnehmervorrichtung gewährleistet. Darüberhinaus kann zum Erreichen einer drehsicheren Verbindung das Festlegeteil entlang seines Außenumfanges ein Sicherungsteil aufweisen, insbesondere in Form einer Rändelung, so daß nach Eingreifen des Verbindungsteiles in die Wegaufnehmervorrichtung sowohl in radialer als auch in axialer Richtung eine sichere Formschlußverbindung gegeben ist.If the displacement transducer device preferably has a groove-shaped recess for the flush engagement of the bow spring, the leg pieces, at least on their mutually facing inner sides, having an arcuate receptacle for receiving a rotationally symmetrical fixing part of the switching device, and this fixing part has a wedge-shaped recess, is a play-free coupling guaranteed by switching device with displacement transducer. In addition, in order to achieve a rotationally secure connection, the fixing part can have a securing part along its outer circumference, in particular in the form of knurling, so that after the connection part engages in the displacement transducer device, a secure positive-locking connection is provided both in the radial and in the axial direction.

Im folgenden wird die erfindungsgemäße Schaltvorrichtung mit Wegaufnehmervorrichtung anhand der Zeichnung in prinzipieller und nicht maßstäblicher Darstellung näher erläutert.In the following, the switching device according to the invention with displacement sensor device is explained in more detail with reference to the drawing in a basic and not to scale illustration.

Es zeigen

Fig. 1
in der oberen und unteren Bildhälfte einen Längsschnitt bzw. in Ansicht die aus Schalt- und Wegaufnehmervorrichtung bestehende Baueinheit;
Fig. 2
eine Stirnansicht auf das im Eingriff befindliche Verbindungsteil;
Fig. 3
eine Draufsicht auf die Wegaufnehmervorrichtung nach der Fig. 1 ohne Schaltvorrichtung.
Show it
Fig. 1
in the upper and lower half of the picture a longitudinal section or in view of the structural unit consisting of switching and displacement sensor device;
Fig. 2
an end view of the engaged connector;
Fig. 3
a plan view of the displacement sensor device according to FIG. 1 without switching device.

Die als Ganzes mit 10 bezeichnete Schaltvorrichtung nach der Fig. 1 weist einen Spulenkörper 12 aus Kunststoffmaterial auf. Der Spulenkörper 12 hat endseitig zwei ringförmige Flansche, zwischen denen sich das Wicklungspaket 14 eines Leiters erstreckt, welches in der Fig. 1 nur schematisch wiedergegeben ist. In dem Spulenkörper 10 ist ein sogenanntes Polrohr 16 geführt, in dem wiederum längsverfahrbar angeordnet ein bolzenförmiges Schaltteil 18 entgegen der Federkraft einer Druckfeder 20 verfahrbar ist. An einem freien Ende des Schaltteiles 18 ist mittig eine Betätigungsstange 22 angeordnet, wohingegen am gegenüberliegenden Ende des Schaltteiles 18 dieses ebenfalls mittig eine Meßstange 24 aufweist. Die Betätigungsstange 22 dient dem Ansteuern eines Ventilkörpers, wohingegen die Meßstange 24 der Überprüfung der Schaltposition des Schaltteiles 18 und mithin der Betätigungsstange 22 dient, woraus sich wiederum Rückschlüsse über den Ansteuerungszustand des Ventiles ergeben.The switching device designated as a whole by 10 according to FIG. 1 has a coil former 12 made of plastic material. The end of the coil body 12 has two annular flanges, between which the winding package 14 of a conductor extends, which is shown only schematically in FIG. 1. A so-called pole tube 16 is guided in the coil former 10, in which a bolt-shaped switching part 18, which is in turn arranged to be longitudinally movable, can be moved counter to the spring force of a compression spring 20. An actuating rod 22 is arranged centrally at a free end of the switching part 18, whereas at the opposite end of the switching part 18 it also has a measuring rod 24 in the center. The actuating rod 22 is used to control a valve body, whereas the measuring rod 24 is used to check the switching position of the switching part 18 and thus the actuating rod 22, which in turn provides information about the actuation state of the valve.

Die Schaltvorrichtung 10 weist darüberhinaus eine elektrische Anschlußstelle 26 auf in Form eines Kontaktsteckers zwecks Anschluß an eine ansteuerbare Stromquelle (nicht dargestellt) auf. Der dahingehende Aufbau einer Schaltvorrichtung 10 ist im Stand der Technik bekannt. Wird das Wicklungspaket 14 des Spulenkörpers 12 elektrisch erregt, wird unter dem Einfluß des entstehenden Feldes in Blickrichtung auf die Fig. 1 gesehen, das Schaltteil 18 entgegen der Rückstellkraft der Druckfeder 20 nach links, gegen die Druckfeder im Ventil, bewegt, wobei die Betätigungsstange 22 einfährt und zwar um die Verfahrstrecke des Schaltteiles 18 in entsprechender Weise nach rechts. Durch die derart ausgelöste Verfahrbewegung der Meßstange 24 des Schaltteiles 18 wird eine Feldänderung in der Spulenwicklung des Spulenkörpers 28 der als Ganzes mit 30 bezeichneten Wegaufnehmervorrichtung erzeugt, der sich auch aus mehreren Einzelspulen (nicht dargestellt) zusammensetzen kann. Die dahingehende Signaländerung wird elektrisch über entsprechende Verbindungsleitungen des Spulenkörpers 28 an einen Gerätestecker 32 weitergegeben, an den eine elektronische Auswerteeinheit (nicht dargestellt) anschließbar ist. Der dahingehende Aufbau einer Wegaufnehmervorrichtung ist im Stand der Technik ebenfalls in verschiedensten Ausführungsformen bekannt.The switching device 10 also has an electrical connection point 26 in the form of a contact plug for the purpose of connection to a controllable current source (not shown). The relevant structure of a switching device 10 is known in the prior art. If the winding package 14 of the bobbin 12 is electrically excited, it is seen under the influence of the field that arises as seen in FIG. 1, the switching part 18 moves against the restoring force of the compression spring 20 to the left against the compression spring in the valve, the actuating rod 22 retracts to the right by the travel distance of the switching part 18 in a corresponding manner. The movement of the measuring rod 24 of the switching part 18 triggered in this way causes a change in the field in the coil winding of the coil body 28 to take place as a whole 30 designated displacement sensor device, which can also be composed of several individual coils (not shown). The relevant signal change is passed on electrically via corresponding connecting lines of the coil body 28 to a device connector 32 to which an electronic evaluation unit (not shown) can be connected. The relevant structure of a displacement transducer device is also known in a wide variety of embodiments in the prior art.

Die Meßstange 24 ist von einer Aufnahmehülse 34 radial umgeben, die ein druckdichtes Rohr darstellt und außenumfangsseitig eine Auflagefläche für das Spulensystem 28 ausbildet, das auf die Aufnahmehülse 34 entgegen der Federkraft einer Einstellfeder 36 aufschiebbar ist. Über eine Sechskantmutter 38 sowie eine Distanzhülse 40 läßt sich dann - auch kundenseitig - eine "mechanische" Nullpunktjustierung für das Wegaufnehmermeßsystem 30 vornehmen. Die Aufnahmehülse 34 ist an ihrem zur Umgebung hin zugewandten Ende abgeschlossen und ist derart lang bemessen, daß die Meßstange 24 in jeder Position des Schaltteiles 18 über eine freie Verfahrlänge innerhalb der Aufnahmehülse 34 verfügt. An ihrem zur Schaltvorrichtung 10 zugewandten Ende weist die Aufnahmehülse 34 eine Verbreiterung 42 auf, über die sie fest mit einem büchsenartigen Festlegeteil 44 entlang dessen Innenseite verbunden ist. Das Festlegeteil 44, das als Verschlußteil dient, ist fest mit dem Polrohr 16 verbunden und im wesentlichen Teil desselben. An seiner der Schaltvorrichtung 10 zugekehrten Seite weist das Festlegeteil 44 eine Abstützfläche für die bereits angesprochene Druckfeder 20 auf. Desweiteren verfügt es über eine Mittenausnehmung für den freien Durchgriff der Meßstange 24 des Schaltteiles 18. Außenumfangsseitig sind in Ringnuten des Festlegeteiles 44 übliche Runddichtungen eingelegt. Für die feste Verbindung des Polrohres 16 mit dem Festlegeteil 44 ist das Polrohr 16 an seinem zur Wegaufnehmervorrichtung 30 zugekehrten Ende mit einer Sicke versehen. Desweiteren bildet das Festlegeteil 44 eine Anlagefläche für die Einstellfeder 36 aus und über einen Absatz ist ein Distanzrohr 46 der Wegaufnehmervorrichtung 30 in Anlage mit dem Festlegeteil 44. Das Festlegeteil 44 wird von einer Aufschubhülse 48 der Wegaufnehmervorrichtung 30 umfaßt, die auch das Polrohr 16 teilweise radial umfaßt, und stirnseitig an die eigentliche Schaltvorrichtung 10 anschließt. Darüberhinaus gibt die ein Wegaufnehmergehäuse bildende Aufschubhülse 48 einen Ringkanal für einen Dichtring 50 zwischen Polrohr 16 und Aufschubhülse 48 frei.The measuring rod 24 is radially surrounded by a receiving sleeve 34, which is a pressure-tight tube and on the outer circumferential side forms a contact surface for the coil system 28, which can be pushed onto the receiving sleeve 34 against the spring force of an adjusting spring 36. A hexagon nut 38 and a spacer sleeve 40 can then - also by the customer - carry out a "mechanical" zero point adjustment for the displacement transducer 30. The receiving sleeve 34 is closed at its end facing the environment and is dimensioned so long that the measuring rod 24 has a free travel length within the receiving sleeve 34 in every position of the switching part 18. At its end facing the switching device 10, the receiving sleeve 34 has a widening 42, via which it is fixedly connected to a sleeve-like fixing part 44 along the inside thereof. The fixing part 44, which serves as a closure part, is fixedly connected to the pole tube 16 and is essentially part of the same. On its side facing the switching device 10, the fixing part 44 has a support surface for the compression spring 20 already mentioned. Furthermore, it has a central recess for the free passage of the measuring rod 24 of the switching part 18. On the outer circumference, the usual round seals are inserted in the ring grooves of the fixing part 44. For the fixed connection of the pole tube 16 to the fixing part 44, the pole tube 16 is provided with a bead at its end facing the displacement transducer device 30. Furthermore, the fixing part 44 forms a contact surface for the adjusting spring 36 and is over a shoulder Spacer tube 46 of the displacement sensor 30 in contact with the fixing part 44. The fixing part 44 is surrounded by a push-on sleeve 48 of the displacement sensor 30, which also partially surrounds the pole tube 16 radially, and connects to the actual switching device 10 on the end face. In addition, the push-on sleeve 48 forming a displacement sensor housing releases an annular channel for a sealing ring 50 between the pole tube 16 and the push-on sleeve 48.

Die Aufschubhülse 48 ist außenumfangsseitig mit Griffmulden 52 versehen, die die Handhabung, insbesondere das Aufstecken der Wegaufnehmervorrichtung 30 bei der Montage auf die vorstehenden Teile der Schaltvorrichtung 10 erleichtern. Wie insbesondere der Querschnitt nach der Fig. 1 zeigt, weist das Festlegeteil 44 eine keilförmige Ausnehmung 54 auf, wobei die Neigung des Keiles der Ausnehmung 54 sich quer zur Bewegungsrichtung des Schaltteiles 18 erstreckt und wobei der freie Öffnungsquerschnitt sich in Richtung des Schaltteiles 18 verringert. Über die keilförmige Ausnehmung 44 läßt sich, in axialer Richtung gesehen, eine spielfreie Verbindung von Schaltvorrichtung 10 mit Wegaufnehmervorrichtung 30 über eine Verbindungseinrichtung in Form eines federelastischen Verbindungsteil 56 erreichen, wie es im einzelnen in der Fig. 2 dargestellt ist.The push-on sleeve 48 is provided on the outer circumferential side with recessed grips 52 which facilitate handling, in particular the attachment of the displacement sensor device 30 during assembly on the protruding parts of the switching device 10. As the cross section according to FIG. 1 in particular shows, the fixing part 44 has a wedge-shaped recess 54, the inclination of the wedge of the recess 54 extending transversely to the direction of movement of the switching part 18 and the free opening cross section decreasing in the direction of the switching part 18. Seen in the axial direction, the wedge-shaped recess 44 can be used to achieve a play-free connection of the switching device 10 with the displacement transducer device 30 via a connecting device in the form of a spring-elastic connecting part 56, as is shown in detail in FIG. 2.

Das in der Fig. 2 näher dargestellte federelastische Verbindungsteil 56 besteht aus einer Bügelfeder 58 mit zwei federelastisch zueinander bewegbaren Schenkelstücken 60, die die Schaltvorrichtung 10 an der Stelle des rotationssymmetrichen Festlegeteiles 44 in etwa mittig umgreifen. Das Verbindungsteil 56 ist aus einem nicht magnetischen Federstahldraht gebildet. Es kann jedoch auch aus einem magnetisierbaren Federstahldraht gebildet sein. Für den bündigen Eingriff der Bügelfeder 58 (vergl. Fig. 1) weist die Wegaufnehmervorrichtung 30 eine nutförmige Ausnehmung 62 auf. Des weiteren weisen die beiden Schenkelstücke 60 an ihren einander zugewandten Innenseiten jeweils ein bogenförmiges Aufnahmestück 64 auf für den Eingriff in die keilförmige Ausnehmung 54 des Festlegeteiles 44. Die freien Enden der Bügelfeder 58 sind, wie dies insbesondere die Fig. 2 zeigt, in etwa rechtwinklig nach außen abgespreizt und weisen mithin einen Überstand über die Außenumfangsseite des rotationssymmetrischen Festlegeteiles 44 auf. Die Schenkelstücke 56 sind darüberhinaus über ein bogenförmiges Mittenstück 66 der Bügelfeder 58 miteinander in Verbindung. Die Wölbung der bogenförmigen Aufnahmestücke 64 entsprechen im wesentlichen der Außenumfangswölbung des Festlegeteiles 44.The resilient connecting part 56 shown in FIG. 2 consists of a bow spring 58 with two resiliently movable leg pieces 60 which encompass the switching device 10 at the location of the rotationally symmetrical fixing part 44 approximately in the center. The connecting part 56 is formed from a non-magnetic spring steel wire. However, it can also be formed from a magnetizable spring steel wire. For the flush engagement of the bow spring 58 (cf. FIG. 1), the displacement sensor device 30 has a groove-shaped recess 62. Furthermore, the two leg pieces 60 each have an arcuate on their mutually facing inner sides Receptacle 64 on for engagement in the wedge-shaped recess 54 of the fixing part 44. The free ends of the bow spring 58 are, as shown in particular in FIG on. The leg pieces 56 are also connected to one another via an arcuate central piece 66 of the bow spring 58. The curvature of the arc-shaped receiving pieces 64 essentially correspond to the outer circumferential curvature of the fixing part 44.

Das Festlegeteil 44 weist des weiteren entlang seines Außenumfanges in axialer Richtung seitlich neben der keilförmigen Ausnehmung 54 ein Sicherungsteil 68 in Form einer Rändelung auf, das zur drehsicheren Verbindung mit der Wegaufnehmervorrichtung dient, die über ein entsprechendes Eingriffsteil 70 für die Verbindung mit dem Sicherungsteil 68 aufweist. Hiermit ist neben einer axialen Sicherung auch eine Verdrehsicherung gegeben, die zum einen die justierung beim Aufsetzen der Aufschubhülse 48 und mithin der Wegaufnehmervorrichtung 30 auf die Schaltvorrichtung 10 erleichtert und zum andern eine radiale Lagesicherung im späteren Betrieb gewährleistet.The fixing part 44 also has, along its outer circumference in the axial direction, to the side next to the wedge-shaped recess 54, a securing part 68 in the form of knurling, which is used for the rotationally secure connection to the displacement transducer device, which has a corresponding engagement part 70 for connection to the securing part 68 . In addition to an axial securing device, this also provides an anti-rotation device which on the one hand facilitates the adjustment when the push-on sleeve 48 and thus the displacement sensor device 30 is placed on the switching device 10 and on the other hand ensures a radial position securing in later operation.

Claims (6)

Schaltvorrichtung, insbesondere in Form eines Schaltmagneten mit einer Wegaufnehmervorrichtung zur Überwachung der Position eines Schaltteiles (18) der Schaltvorrichtung(10), die mit der Wegaufnehmervorrichtung (30) über eine lösbare Verbindungseinrichtung koppelbar ist, dadurch gekennzeichnet, daß die Verbindungseinrichtung ein federelastisches Verbindungsteil (56) aufweist, das eine Vorrichtung (30) durchgreift und die andere Vorrichtung (10) umgreift.Switching device, in particular in the form of a switching magnet with a displacement pickup device for monitoring the position of a switching part (18) of the switching device (10), which can be coupled to the displacement pickup device (30) via a releasable connecting device, characterized in that the connecting device is a spring-elastic connecting part (56 ) which extends through one device (30) and embraces the other device (10). Schaltvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das Verbindungsteil (56) eine Bügelfeder (58) ist mit zwei federelastisch zueinander bewegbaren Schenkelstücken (60), die die Schaltvorrichtung (10) umgreifen.Switching device according to claim 1, characterized in that the connecting part (56) is a bow spring (58) with two resiliently movable leg pieces (60) which encompass the switching device (10). Schaltvorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Verbindungsteil (56) aus einem Federstahldraht gebildet ist.Switching device according to claim 1 or 2, characterized in that the connecting part (56) is formed from a spring steel wire. Schaltvorrichtung nach Anspruch 2 oder 3, dadurch gekennzeichnet, daß die Wegaufnehmervorrichtung (30) eine nutförmige Ausnehmung (62) für den bündigen Eingriff der Bügelfeder (58) aufweist und daß die Schenkelstücke (60) zumindest an ihren einander zugewandten Innenseiten jeweils ein bogenförmiges Aufnahmestück (64) für die Aufnahme eines rotationssymmetrischen Festlegeteiles (44) der Schaltvorrichtung (10) aufweisen.Switching device according to claim 2 or 3, characterized in that the displacement sensor device (30) has a groove-shaped recess (62) for the flush engagement of the bow spring (58) and that the leg pieces (60) each have an arcuate receiving piece (at least on their mutually facing inner sides) 64) for receiving a rotationally symmetrical fixing part (44) of the switching device (10). Schaltvorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß das Festlegeteil (44) eine keilförmige Ausnehmung (54) aufweist, daß die Neigung des Keiles der Ausnehmung (54) sich quer zur Bewegungsrichtung des Schaltteiles (18) erstreckt und daß der freie Öffnungsquerschnitt sich in Richtung des Schaltteiles (18) verringert.Switching device according to claim 4, characterized in that the fixing part (44) has a wedge-shaped recess (54) that the Inclination of the wedge of the recess (54) extends transversely to the direction of movement of the switching part (18) and that the free opening cross section decreases in the direction of the switching part (18). Schaltvorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß das Festlegeteil (44) entlang seines Außenumfanges ein Sicherungsteil 68) zur drehsicheren Verbindung mit der Wegaufnehmervorrichtung (30) aufweist.Switching device according to Claim 5, characterized in that the fixing part (44) has a securing part 68) along its outer circumference for the rotationally secure connection to the displacement sensor device (30).
EP97110616A 1996-10-31 1997-06-28 Switching device with displacement sensor Expired - Lifetime EP0840333B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19643976 1996-10-31
DE19643976A DE19643976A1 (en) 1996-10-31 1996-10-31 Switching device with displacement sensor device

Publications (2)

Publication Number Publication Date
EP0840333A1 true EP0840333A1 (en) 1998-05-06
EP0840333B1 EP0840333B1 (en) 2001-07-11

Family

ID=7809711

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97110616A Expired - Lifetime EP0840333B1 (en) 1996-10-31 1997-06-28 Switching device with displacement sensor

Country Status (4)

Country Link
EP (1) EP0840333B1 (en)
DE (2) DE19643976A1 (en)
ES (1) ES2160284T3 (en)
PT (1) PT840333E (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000074085A2 (en) * 1999-05-29 2000-12-07 Danfoss A/S Electromagnetic actuator

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008056377A1 (en) 2008-11-08 2010-05-12 Robert Bosch Gmbh transducer
DE102009041159B4 (en) 2009-09-14 2022-12-08 Magnet-Schultz Gmbh & Co. Kg Displacement sensor unit and arrangement with the displacement sensor unit

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4683453A (en) * 1985-11-25 1987-07-28 Automatic Switch Company Solenoid actuator with fastener
US4805870A (en) * 1983-02-03 1989-02-21 Emerson Electric Co. Coil retainer for solenoid
DE9208939U1 (en) * 1992-07-03 1992-09-17 Elektroteile GmbH, 78333 Stockach Switching magnet with inductive position sensor

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3401564A1 (en) * 1984-01-18 1985-07-25 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Device for joining a dust bag to the extractor nozzle of a motor-driven oscillating grinding machine
DE3506053A1 (en) * 1985-02-21 1986-08-21 Mannesmann Rexroth GmbH, 8770 Lohr Switching magnet for direct current for driving a valve element

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4805870A (en) * 1983-02-03 1989-02-21 Emerson Electric Co. Coil retainer for solenoid
US4683453A (en) * 1985-11-25 1987-07-28 Automatic Switch Company Solenoid actuator with fastener
DE9208939U1 (en) * 1992-07-03 1992-09-17 Elektroteile GmbH, 78333 Stockach Switching magnet with inductive position sensor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000074085A2 (en) * 1999-05-29 2000-12-07 Danfoss A/S Electromagnetic actuator
WO2000074085A3 (en) * 1999-05-29 2002-05-23 Danfoss As Electromagnetic actuator
US6459348B1 (en) * 1999-05-29 2002-10-01 Danfoss A/S Electromagnetic actuator

Also Published As

Publication number Publication date
ES2160284T3 (en) 2001-11-01
PT840333E (en) 2001-12-28
DE19643976A1 (en) 1998-05-07
DE59704004D1 (en) 2001-08-16
EP0840333B1 (en) 2001-07-11

Similar Documents

Publication Publication Date Title
DE4142996A1 (en) METHOD FOR MEASURING THE MECHANICAL MOVEMENT OF A SOLENOID VALVE ARMOR, ESPECIALLY ELECTRICALLY CONTROLLED INJECTION SYSTEMS
DE2844010A1 (en) DETECTOR FOR LINEAR ADJUSTMENTS
EP0207270B1 (en) Contactless working proximity switching device
DE29605845U1 (en) Sensor arrangement for current and voltage measurement
WO1998059217A1 (en) Solenoid coil displacement sensor system
EP0646247B1 (en) Terminal for connecting live conductors
EP0840333B1 (en) Switching device with displacement sensor
DE2931381C2 (en) Deflection or stroke sensor
EP1691165B1 (en) Apparatus for checking tolerances of dimension, shape and position of a mechanical part
DE102017121094A1 (en) Valve control head
EP0268030B1 (en) Potentiometer or adjustable resistorce
DE3713880A1 (en) MAGNETIC BARRIERS
DE3826184C2 (en)
DE19545923A1 (en) Piston-cylinder device with inductive stroke-measuring sensor for stroke controlled lifting of loads
DE10121770A1 (en) Electromagnetic actuator
DE102016108612A1 (en) Stud Welding Gun
DE19632211A1 (en) Displacement sensor
DE10023503B9 (en) position switch
DE3039894C2 (en)
DE3901841C2 (en) Device for generating at least one measured variable which depends on the deflection of a head part of a body which can be deflected from a rest position against the action of a restoring force
DE68919230T2 (en) MEANS AND METHOD FOR MEASURING INDUCTANCE.
DE10227425A1 (en) Inductive displacement measurement device for analog final control element has oscillator coil on non-conducting carrier brought to magnetic saturation by magnetic sender approaching coil
DD237371A1 (en) INDUCTIVE MEASURING DEVICE
DE4025101A1 (en) Adjuster with displacement transducer - has simple, compact analogue position measurement arrangement for control pin
DE10135218A1 (en) Motor vehicle lock

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE ES FR GB IE IT MC PT

17P Request for examination filed

Effective date: 19980525

AKX Designation fees paid

Free format text: DE ES FR GB IE IT MC PT

RBV Designated contracting states (corrected)

Designated state(s): DE ES FR GB IE IT MC PT

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: HYDAC ELECTRONIC GMBH

17Q First examination report despatched

Effective date: 19991230

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE ES FR GB IE IT MC PT

ITF It: translation for a ep patent filed

Owner name: BUZZI, NOTARO&ANTONIELLI D'OULX

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 20010712

REF Corresponds to:

Ref document number: 59704004

Country of ref document: DE

Date of ref document: 20010816

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: GERMAN

ET Fr: translation filed
REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2160284

Country of ref document: ES

Kind code of ref document: T3

REG Reference to a national code

Ref country code: PT

Ref legal event code: SC4A

Free format text: AVAILABILITY OF NATIONAL TRANSLATION

Effective date: 20011010

REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: MC

Payment date: 20040505

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: PT

Payment date: 20050509

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20050513

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 20050603

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20050629

Year of fee payment: 9

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050630

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20060628

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20060629

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20061228

REG Reference to a national code

Ref country code: PT

Ref legal event code: MM4A

Free format text: LAPSE DUE TO NON-PAYMENT OF FEES

Effective date: 20061228

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20060628

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20070228

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20060629

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20060630

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20080603

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IE

Payment date: 20080626

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20090618

Year of fee payment: 13

REG Reference to a national code

Ref country code: IE

Ref legal event code: MM4A

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20090629

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20090628

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110101