EP0268030B1 - Potentiometer or adjustable resistorce - Google Patents
Potentiometer or adjustable resistorce Download PDFInfo
- Publication number
- EP0268030B1 EP0268030B1 EP87112533A EP87112533A EP0268030B1 EP 0268030 B1 EP0268030 B1 EP 0268030B1 EP 87112533 A EP87112533 A EP 87112533A EP 87112533 A EP87112533 A EP 87112533A EP 0268030 B1 EP0268030 B1 EP 0268030B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- contact member
- working cylinder
- potentiometer
- piston rod
- 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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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/28—Means for indicating the position, e.g. end of stroke
- F15B15/2815—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
- F15B15/2853—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT using potentiometers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C10/00—Adjustable resistors
- H01C10/14—Adjustable resistors adjustable by auxiliary driving means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C10/00—Adjustable resistors
- H01C10/30—Adjustable resistors the contact sliding along resistive element
- H01C10/38—Adjustable resistors the contact sliding along resistive element the contact moving along a straight path
Definitions
- the invention relates to a potentiometer arrangement for detecting the position of the piston of a pressure medium-operated working cylinder according to the preamble of claims 1 and 5.
- a potentiometer is known from DE 35 20 199 A1, which consists of a resistance track and a contact member that can be guided along the resistance track by means of an actuating member.
- the actuator consists of a rod-shaped body.
- the resistance track and the contact member connected to the rod-shaped body are arranged in a housing in order to protect the resistance track and the contact member from dust and moisture.
- the actuator designed as a rod-shaped body is sealed by an opening provided in the housing and is led out of the housing. If the potentiometer is used, for example, to detect the position of the piston of a working cylinder, it is necessary to arrange the part carrying the resistance track on the cylinder and to connect the actuating member to the piston or to the piston rod of the working cylinder.
- a rigid coupling of the contact member to the piston rod of a working cylinder is known from EP O 177 693.
- the resistance tracks are arranged within a tube which is open at the end and which is connected at one end to the cylinder cover.
- the piston rod is pierced, so that it can be telescopically pushed onto the tube containing the resistance tracks.
- the contact member is connected to the piston rod via a coupling rod which is arranged inside the pierced piston rod. This moves the contact element depending on the piston movement.
- a seal is required for the pierced piston rod and the open tube in which the resistance tracks are arranged, which seal is also provided in this known potentiometer.
- the arrangement of additional seals on the one hand, requires more assembly work and, on the other hand, the need to replace the seals from time to time.
- the object of the invention is to create a potentiometer device for pressure-operated working cylinders, in which a contactless coupling between the actuating and contact element is made possible without the use of additional seals and can also be integrated in a working cylinder and a further potentiometer device create that using the non-contact Coupling can be attached externally to a matching working cylinder.
- the invention offers in particular the advantage of obtaining a potentiometer or a variable resistor with an actuating element for the contact element which operates in a contactless manner with respect to the contact element. Because there is no longer a mechanical connection between the contact element and the actuating element, the actuating element and the device connected to the actuating element, such as, for example, the piston or the piston rod of a working cylinder, can be rotated relative to the piston element and to the resistance path and thus also to the cylinder.
- the fact that the tubular body is sealed so as to be pressure-tight, and that the bore in the piston rod extending in the axial direction is designed as a blind bore, have the advantage that, in combination with the magnetic actuation of the contact element, additional seals in the area of the piston rod or the tubular body can be dispensed with.
- the arrangement of a blind hole instead of a through hole ensures that seals between the piston rod and the tubular body to prevent a pressure medium short circuit between the pressure chamber in front of the piston and behind the piston are unnecessary.
- the contact element in the potentiometer or variable resistor according to the invention is designed in such a way that it contains the permanent magnet, then the potentiometer or the variable resistor for determining the position of the piston of a working cylinder can also be arranged retrospectively on each working cylinder, the piston of which is at least partially made of a ferromagnetic Material exists. It is no longer necessary to establish a mechanical connection between the piston rod and the actuator for actuating the potentiometer or the variable resistance.
- Fig. 1 shows a working cylinder (1) in which a piston (8) connected to a piston rod (4) is arranged displaceably and sealed.
- the piston (8) divides the working cylinder (1) into a first pressure medium chamber (3) on the piston rod side and a second pressure medium chamber (12) opposite the first pressure medium chamber (3) on the other side of the piston (8).
- the two pressure medium chambers (3, 12) can each be connected to a pressure medium source via a pressure medium connection (2) or (11) and a valve device (not shown).
- the piston rod (4) has a preferably cylindrical recess (5) running in the direction of its longitudinal axis, which begins at the end of the piston rod (4) that extends into the cylinder (1) and moves in the manner of a blind bore in the direction of the through a recess (24) provided in the cylinder bottom extends from the end region of the piston rod (4) which is led out of the working cylinder (1).
- the piston (8) and the piston rod (4) are designed and connected to one another in such a way that the end of the piston rod (4) inside the working cylinder (1) is guided centrally through the piston (8).
- a tubular body (6) made of a non-magnetizable material, such as. As aluminum or plastic, arranged in a fixed position, which is inserted into the recess (5) of the piston rod (4).
- the tubular body (6) is closed at its free end in the recess (5) of the piston rod (4) by a base (23), so that the interior of the tubular body (6) is closed off from the second pressure medium chamber (12) .
- a permanent magnet (10) which serves as an actuating element and is mounted in a groove (9) of the piston rod (4) facing the tubular body (6), surrounds the tubular body (6) in a ring-like manner.
- a carrier (19) preferably made of plastic, for a resistance track (13) and a conductor (18) is arranged in the tubular body (6).
- the carrier (19) can consist of two identically designed parts (19a) and (19b) arranged symmetrically to one another.
- the outer contour of the carrier (19) is adapted to the inner wall of the tubular body (6).
- Grooves (26, 27) are provided in the support (19) in the direction of the longitudinal axis of the support (19) and are used to guide a contact element.
- the contact member is composed of a slide (22) made of a ferromagnetic material and two sliding contacts (15, 16).
- the resistance track (13) and the conductor (18) are inserted parallel to the longitudinal axis of the slide (22) in corresponding grooves of the parts (19a, 19b) and arranged to the slide (22) so that the resistance track (13) with the sliding contact (15) and the conductor (18) cooperates with the sliding contact (16).
- the slide (22) for the sliding contacts (15, 16) has, as shown in Fig. 2, an approximately cruciform profile and has a stepped part in its free end region for fastening the resiliently on the resistance track (13) and the conductor (18th ) adjacent sliding contacts (15, 16).
- Electrical lines (7, 17, 14) are connected to the resistance track (13) and the conductor (18) and lead to a plug (21) arranged on the working cylinder (1).
- Fig. 3 shows a working cylinder with an integrated potentiometer, wherein the actuator consists of a ferromagnetic material and is arranged in the piston of the working cylinder.
- the actuator consists of a ferromagnetic material and is arranged in the piston of the working cylinder.
- a piston (8) connected to a piston rod (4) is arranged displaceably and sealed in a working cylinder (1).
- the piston (8) divides the working cylinder (1) into a piston rod-side pressure medium chamber (3) and a second pressure medium chamber (12) arranged opposite the first pressure medium chamber (3) on the other side of the piston (8).
- the two pressure medium chambers (3, 12) can each be connected to a pressure medium source via a pressure medium connection (2) or (11) and a valve device (not shown).
- the piston rod (4) has a preferably cylindrical recess (5) running in the direction of its longitudinal axis, which begins at the end of the piston rod (4) extending into the cylinder (1) and moves in the manner of a blind bore in the direction of the through a recess (24) provided in the cylinder bottom extends from the end region of the piston rod (4) which is led out of the working cylinder (1).
- the piston (8) and the piston rod (4) are designed and connected to one another in such a way that the end of the piston rod (4) inside the working cylinder (1) is guided centrally through the piston (8) and ends with the side of the piston (8) delimiting the second pressure medium chamber (12).
- a tubular body (6) made of a non-magnetizable material, for. As aluminum or plastic, arranged in a stationary manner, which extends into the recess (5) of the piston rod (4).
- the tubular body (6) is closed at its free end in the recess (5) of the piston rod (4) by a base (23), so that the interior of the tubular body (6) is closed off from the second pressure medium chamber (12) .
- a carrier (19), preferably made of plastic, for a resistance track (13) and a conductor (18) is arranged in the tubular body (6).
- the outer contour of the carrier (19) is adapted to the inner wall of the tubular body (6).
- the carrier (19) is additionally designed as a guide device (25) for a contact member.
- the guide device which serves as a guide means for guiding the contact element, which is driven by an actuating element in a contactless manner under the influence of magnetic forces, is thus arranged in a stationary manner with respect to the resistance track. For this purpose, it has grooves running in the direction of its longitudinal axis.
- the contact member is composed of a permanent magnet designed as a sliding piece (22) and two sliding contacts (15, 16) arranged thereon.
- the piston (8) has a ferromagnetic element (9a) which serves to actuate or to take the slide (22).
- a separate disk-shaped body as an actuator on the piston if the piston itself is made of a disk-shaped carrier made of a ferromagnetic material, such as, for. B. steel, and a ring-shaped sealing element surrounding the carrier.
- the actuating member consists of a ferromagnetic material or contains a ferromagnetic material
- the contact member consists of a magnetic material or contains a magnetic material
- Fig. 4 shows a part of a working cylinder, which is composed of a cylinder (39), a bottom (33), a cover (25) and a piston (40) with a piston rod (43) which is sealed in the cylinder (39).
- the base (33) and the cover (25) are arranged on the two opposite ends of the cylinder (39) and are clamped to the cylinder (39) by means of tie rods connecting the base (33) and the cover (25).
- tie rod (27) is on the one hand through a bore (36) running parallel to the longitudinal axis of the cylinder (39), which is arranged in a part of the base (33) protruding beyond the cylinder jacket, and on the other hand through a bore parallel to the longitudinal axis of the cylinder (39 ) extending bore (26) in a part of the cover (25) protruding beyond the cylinder jacket.
- Nuts (38, 44) the bottom (33) and the cover (25) are held on the end faces of the cylinder (39).
- the tie rod (27) has a recess (29) running in the direction of its longitudinal axis, in which a potentiometer consisting of a resistance track (28), feedback (31) and contact element (30) is arranged.
- the housing of the potentiometer is formed by the tie rod (27).
- the contact member (30) designed as a sliding contact consists of a ferromagnetic material. Permanent magnets (41, 42) arranged on the piston (40) serve as the actuating element for the contact element (30).
- the resistance track (28) and the feedback (31) of the potentiometer are connected via connecting wires (34, 35) to a plug (32) which is arranged on the bottom (33) of the working cylinder.
- the invention naturally extends not only to the exemplary embodiments described, but also permits a large number of variants.
- the contact member and the actuating member with at least one permanent magnet each.
- the contact member can be self-supporting, so that a support for the sliding contacts can be dispensed with.
- the contacts (such as sliding contacts) either consist of a ferromagnetic material or made of a magnetic material and are shaped in such a way that they can be guided along the resistance track in a manner such that they cannot twist and tip over.
- the invention can be applied both to a potentiometer and to a variable resistor.
- the individual components of the potentiometer or the variable resistor can be arranged in a housing, so that an independent device is created which can be attached to or installed in devices and equipment for a wide variety of purposes.
- the resistor track and the contact member-containing housing slidably an annular body containing a permanent magnet or a ferromagnetic part may be arranged.
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Actuator (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Adjustable Resistors (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
Description
Die Erfindung betrifft eine Potentiometeranordnung zur Erfassung der Position des Kolbens eines druckmittelbetriebenen Arbeitszylinders gemäß Oberbegriff der Patentansprüche 1 und 5.The invention relates to a potentiometer arrangement for detecting the position of the piston of a pressure medium-operated working cylinder according to the preamble of
Aus der DE 35 20 199 A1 ist ein Potentiometer bekannt, welches aus einer Widerstandsbahn und einem mittels eines Betätigungsgliedes an der Widerstandsbahn entlang führbaren Kontaktglied besteht. Das Betätigungsglied besteht aus einem stangenförmigen Körper. Im allgemeinen sind die Widerstandsbahn und das mit dem stangenförmigen Körper verbundene Kontaktglied in einem Gehäuse angeordnet, um die Widerstandsbahn und das Kontaktglied vor Staub und Feuchtigkeit zu schützen. Das als stangenförmiger Körper ausgebildete Betätigungsglied ist durch eine im Gehäuse versehene Öffnung abgedichtet und aus dem Gehäuse herausgeführt. Wird das Potentiometer beispielsweise zur Erfassung der Position des Kolbens eines Arbeitszylinders eingesetzt, so ist es erforderlich, das die Widerstandsbahn tragende Teil gehäusefest am Zylinder anzuordnen und das Betätigungsglied mit dem Kolben bzw. mit der Kolbenstange des Arbeitszylinders zu verbinden.A potentiometer is known from
Aus Gründen der Betriebssicherheit ist es zweckmässig, daß Kontaktglied in bezug auf eine in Bewegungsrichtung des Kontaktgliedes gedachte Achse drehfest gegenüber der Widerstandsbahn anzuordnen. Um bei einer solchen Konstruktion die Kolbenstange gegenüber dem Arbeitszylinder um ihre Längsachse verdrehen zu können, ist es aus der erwähnten Schrift DE 35 20 199 A1 bekannt zwischen Betätigungsglied und Kontaktglied eine Gelenkstelle vorzusehen. Die Anordnung einer solchen Gelenkstelle bedeutet einen vermehrten Einsatz von verschleißempfindlichen Bauteilen sowie einen relativ hohen Herstellungs- und Wartungsaufwand.For reasons of operational safety, it is expedient to arrange the contact member in a rotationally fixed manner with respect to the resistance track with respect to an axis intended in the direction of movement of the contact member. In such a construction, the piston rod with respect to the working cylinder about its longitudinal axis To be able to twist, it is known from the
Aus der DE-33 42 492 ist es bekannt, daß zwischen der Betätigung und dem die Schleifkontakte tragenden Kontaktglied keine starre Kopplung vorgesehen ist, sondern daß das Kontaktglied über magnetische Kopplungsmittel verschiebbar ist. Diese magnetischen Kopplungsmittel bestehen aus Permanentmagneten, die in dieser bekannten Ausführung sowohl am Kontaktglied als auch an dem von außen wirkenden Betätigungsglied angeordnet sind.From DE-33 42 492 it is known that no rigid coupling is provided between the actuation and the contact member carrying the sliding contacts, but that the contact member is displaceable via magnetic coupling means. These magnetic coupling means consist of permanent magnets which, in this known embodiment, are arranged both on the contact element and on the actuating element acting from the outside.
Aus der EP O 177 693 ist eine starre Kopplung des Kontaktgliedes mit der Kolbenstange eines Arbeitszylinders bekannt. Hierbei sind die Widerstandsbahnen innerhalb eines stirnseitig offenen Rohres angeordnet, welches an einer Stirnseite mit dem Zylinderdeckel verbunden ist. Die Kolbenstange ist hierbei durchbohrt, so daß sie auf das die Widerstandsbahnen enthaltende Rohr teleskopartig aufschiebbar ist. Das Kontaktglied ist mit der Kolbenstange über eine Koppelstange verbunden, die innerhalb der durchbohrten Kolbenstange angeordnet ist. Diese verschiebt das Kontaktglied in Abhängigkeit zur Kolbenbewegung. Hierbei ist jedoch für die durchbohrte Kolbenstange und das offene Rohr, in dem die Widerstandsbahnen angeordnet sind, eine Abdichtung nötig, die in diesem bekannten Potentiometer auch vorgesehen ist. Die Anordnung von zusätzlichen Dichtungen bedingt jedoch zum einen einen höheren Montageaufwand und zum anderen die Notwendigkeit, die Dichtungen von Zeit zu Zeit zu ersetzen.A rigid coupling of the contact member to the piston rod of a working cylinder is known from EP O 177 693. In this case, the resistance tracks are arranged within a tube which is open at the end and which is connected at one end to the cylinder cover. The piston rod is pierced, so that it can be telescopically pushed onto the tube containing the resistance tracks. The contact member is connected to the piston rod via a coupling rod which is arranged inside the pierced piston rod. This moves the contact element depending on the piston movement. In this case, however, a seal is required for the pierced piston rod and the open tube in which the resistance tracks are arranged, which seal is also provided in this known potentiometer. The arrangement of additional seals, on the one hand, requires more assembly work and, on the other hand, the need to replace the seals from time to time.
Ausgehend von diesem Stand der Technik stellt sich die Erfindung die Aufgabe, eine Potentiometereinrichtung für druckmittelbetriebene Arbeitszylinder zu schaffen, bei der eine berührungslose Kopplung zwischen Betätigungs- und Kontaktglied ohne Verwendung zusätzlicher Dichtungen ermöglicht ist und zudem in einem Arbeitszylinder integriert werden kann und eine weitere Potentiometereinrichtung zu schaffen, die unter Ausnutzung der berührungslosen Kopplung extern an einen darauf abgestimmten Arbeitszylinder fest anbringbar ist.Based on this prior art, the object of the invention is to create a potentiometer device for pressure-operated working cylinders, in which a contactless coupling between the actuating and contact element is made possible without the use of additional seals and can also be integrated in a working cylinder and a further potentiometer device create that using the non-contact Coupling can be attached externally to a matching working cylinder.
Die gestellte Aufgabe wird hinsichtlich der in den Arbeitszylinder integrierbaren Potentiometereinrichtung mit der im Patentanspruch 1 angegebenen Erfindung gelöst. Hinsichtlich der externen Anbringung an einen Arbeitszylinder wird die Aufgabe durch die im Patentanspruch 5 angegebene Erfindung gelöst. Weiterbildungen und vorteilhafte Ausgestaltungen der Erfindungen sind in den Unteransprüchen angegeben.The stated object is achieved with respect to the potentiometer device that can be integrated into the working cylinder with the invention specified in claim 1. With regard to the external attachment to a working cylinder, the object is achieved by the invention specified in
Die Erfindung bietet insbesondere den Vorteil, ein Potentiometer bzw. einen veränderbaren Widerstand mit einem bezüglich des Kontaktgliedes berührungslos arbeitenden Betätigungsglied für das Kontaktglied zu erhalten. Dadurch, daß keine mechanische Verbindung zwischen Kontaktglied und Betätigungsglied mehr vorhanden ist, kann das Betätigungsglied und die mit dem Betätigungsglied verbundene Einrichtung, wie zum Beispiel der Kolben oder die Kolbenstange eines Arbeitszylinders relativ zum Kolbenglied sowie zur Widerstandsbahn und somit auch zum Zylinder verdreht werden.The invention offers in particular the advantage of obtaining a potentiometer or a variable resistor with an actuating element for the contact element which operates in a contactless manner with respect to the contact element. Because there is no longer a mechanical connection between the contact element and the actuating element, the actuating element and the device connected to the actuating element, such as, for example, the piston or the piston rod of a working cylinder, can be rotated relative to the piston element and to the resistance path and thus also to the cylinder.
Wenn das Potentiometer in einem Gehäuse angeordnet wird, ist eine besondere Abdichtung für den das Kontaktglied und die Widerstandsbahn beinhaltenden Raum nicht mehr erforderlich, da ein diesen Raum begrenzendes Gehäuse keine Öffnung zum Durchführen eines Betätigungsgliedes mehr benötigt.If the potentiometer is arranged in a housing, a special seal is no longer required for the space containing the contact element and the resistance track, since a space delimiting this space Housing no opening needed to perform an actuator.
Die Tatsache, den rohrförmigen Körper druckmitteldicht abgeschlossen zu gestalten, sowie die in der Kolbenstange sich in axialer Richtung erstreckende Bohrung als Sackbohrung auszugestalten, führen zu dem Vorteil, daß in Kombination mit der magnetischen Betätigbarkeit des Kontaktgliedes gänzlich auf zusätzliche Dichtungen im Bereich der Kolbenstange oder des rohrförmigen Körpers verzichtet werden kann. Die Anordnung einer Sackbohrung anstatt einer Durchgangsbohrung gewährleistet, daß Dichtungen zwischen Kolbenstange und dem rohrförmigen Körper zur Verhinderung eines Druckmittel-Kurzschlusses zwischen dem Druckraum vor dem Kolben und hinter dem Kolben überflüssig werden.The fact that the tubular body is sealed so as to be pressure-tight, and that the bore in the piston rod extending in the axial direction is designed as a blind bore, have the advantage that, in combination with the magnetic actuation of the contact element, additional seals in the area of the piston rod or the tubular body can be dispensed with. The arrangement of a blind hole instead of a through hole ensures that seals between the piston rod and the tubular body to prevent a pressure medium short circuit between the pressure chamber in front of the piston and behind the piston are unnecessary.
Wird beim erfindungsgemäßen Potentiometer bzw. veränderbaren Widerstand das Kontaktglied so ausgestaltet, daß es den Permanentmagneten enthält, so kann das Potentiometer bzw. der veränderbare Widerstand zur Positionsfeststellung des Kolbens eines Arbeitszylinders auch nachträglich auf jedem Arbeitszylinder angeordnet werden, dessen Kolben wenigstens zum Teil aus einem ferromagnetischen Werkstoff besteht. Es ist nicht mehr erforderlich zur Betätigung des Potentiometers bzw. des veränderbaren Widerstandes eine mechanische Verbindung zwischen Kolbenstange und Betätigungsglied herzustellen.If the contact element in the potentiometer or variable resistor according to the invention is designed in such a way that it contains the permanent magnet, then the potentiometer or the variable resistor for determining the position of the piston of a working cylinder can also be arranged retrospectively on each working cylinder, the piston of which is at least partially made of a ferromagnetic Material exists. It is no longer necessary to establish a mechanical connection between the piston rod and the actuator for actuating the potentiometer or the variable resistance.
Anhand der Zeichnungen werden nachstehend drei Ausführungsbeispiele der Erfindung näher erläutert.Three exemplary embodiments of the invention are explained in more detail below with reference to the drawings.
Es zeigen:
- Figur 1
- einen Arbeitszylinder mit integriertem Potentiometer, wobei das Potentiometer am Boden des Arbeitszylinders befestigt ist und sich in eine in der Kolbenstange angeordnete Ausnehmung hineinerstreckt und der als Betätigungsglied für das Kontaktglied dienende Permanentmagnet an der Kolbenstange angeordnet ist,
Figur 2- einen Schnitt durch die Kolbenstange und das Potentiometer gemäß Figur 1,
Figur 3- einen Arbeitszylinder mit integriertem Potentiometer, wobei das Kontaktglied einen Permanentmagneten enthält und als Betätigungsglied ein aus einem ferromagnetischen Werkstoff bestehendes Teil des Arbeitskolbens dient und
- Fig. 4
- einen Arbeitszylinder mit aufgesetztem Potentiometer, wobei als Betätigungsglied ein am Arbeitskolben angeordneter Permanentmagnet dient.
- Figure 1
- a working cylinder with integrated potentiometer, the potentiometer being fastened to the bottom of the working cylinder and extending into a recess arranged in the piston rod and the permanent magnet serving as an actuating element for the contact element being arranged on the piston rod,
- Figure 2
- 2 shows a section through the piston rod and the potentiometer according to FIG. 1,
- Figure 3
- a working cylinder with an integrated potentiometer, the contact member containing a permanent magnet and serving as an actuating member consisting of a ferromagnetic material part of the working piston and
- Fig. 4
- a working cylinder with attached potentiometer, a permanent magnet arranged on the working piston serving as the actuating member.
Fig. 1 zeigt einen Arbeitszylinder (1), in welchem ein mit einer Kolbenstange (4) verbundener Kolben (8) abgedichtet verschiebbar angeordnet ist. Der Kolben (8) unterteilt den Arbeitszylinder (1) in eine kolbenstangenseitige erste Druckmittelkammer (3) und eine der ersten Druckmittelkammer (3) gegenüber, auf der anderen Seite des Kolbens (8) liegende zweite Druckmittelkammer (12). Die beiden Druckmittelkammern (3, 12) sind je über einen Druckmittelanschluß (2) bzw. (11) und eine nicht dargestellte Ventileinrichtung mit einer Druckmittelquelle verbindbar.Fig. 1 shows a working cylinder (1) in which a piston (8) connected to a piston rod (4) is arranged displaceably and sealed. The piston (8) divides the working cylinder (1) into a first pressure medium chamber (3) on the piston rod side and a second pressure medium chamber (12) opposite the first pressure medium chamber (3) on the other side of the piston (8). The two pressure medium chambers (3, 12) can each be connected to a pressure medium source via a pressure medium connection (2) or (11) and a valve device (not shown).
Die Kolbenstange (4) weist eine in Richtung ihrer Längsachse verlaufende, vorzugsweise zylindrische Ausnehmung (5) auf, welche an dem sich in den Zylinder (1) hineinerstreckenden Ende der Kolbenstange (4) beginnt und sich nach Art einer Sackbohrung in Richtung auf den durch eine im Zylinderboden vorgesehene Ausnehmung (24) aus dem Arbeitszylinder (1) herausgeführten Endbereich der Kolbenstange (4) zu erstreckt. Der Kolben (8) und die Kolbenstange (4) sind so ausgebildet und so miteinander verbunden, daß das innerhalb des Arbeitszylinders (1) liegende Ende der Kolbenstange (4) zentrisch durch den Kolben (8) hindurchgeführt ist.The piston rod (4) has a preferably cylindrical recess (5) running in the direction of its longitudinal axis, which begins at the end of the piston rod (4) that extends into the cylinder (1) and moves in the manner of a blind bore in the direction of the through a recess (24) provided in the cylinder bottom extends from the end region of the piston rod (4) which is led out of the working cylinder (1). The piston (8) and the piston rod (4) are designed and connected to one another in such a way that the end of the piston rod (4) inside the working cylinder (1) is guided centrally through the piston (8).
Am Deckel (20) des Arbeitszylinders (1) ist koaxial zur Kolbenstange (4) ein rohrförmiger Körper (6) aus einem nicht magnetisierbaren Werkstoff, wie z. B. Aluminium oder Kunststoff, ortsfest angeordnet, welcher sich in die Ausnehmung (5) der Kolbenstange (4) hineinersteckt.On the cover (20) of the working cylinder (1) coaxial to the piston rod (4) is a tubular body (6) made of a non-magnetizable material, such as. As aluminum or plastic, arranged in a fixed position, which is inserted into the recess (5) of the piston rod (4).
Der rohrförmige Körper (6) ist an seinem in der Ausnehmung (5) der Kolbenstange (4) befindlichen freien Ende von einem Boden (23) verschlossen, so daß der Innenraum des rohrförmigen Körpers (6) gegen die zweite Druckmittelkammer (12) abgeschlossen ist. Ein in einer dem rohrförmigen Körper (6) zugewandten Nut (9) der Kolbenstange (4) gelagerter als Betätigungsglied dienender Permanentmagnet (10) umgibt ringartig den rohrförmigen Körper (6). Im rohrförmigen Körper (6) ist ein vorzugsweise aus Kunststoff gefertigter Träger (19) für eine Widerstandsbahn (13) und einen Leiter (18) angeordnet.The tubular body (6) is closed at its free end in the recess (5) of the piston rod (4) by a base (23), so that the interior of the tubular body (6) is closed off from the second pressure medium chamber (12) . A permanent magnet (10), which serves as an actuating element and is mounted in a groove (9) of the piston rod (4) facing the tubular body (6), surrounds the tubular body (6) in a ring-like manner. A carrier (19), preferably made of plastic, for a resistance track (13) and a conductor (18) is arranged in the tubular body (6).
Der Träger (19) kann, wie in Fig. 2 dargestellt, aus zwei gleich ausgebildeten symetrisch zueinander angeordneten Teilen (19a) und (19b) bestehen. Die Außenkontur des Trägers (19) ist der Innenwand des rohrförmigen Körpers (6) angepaßt. Im Träger (19) sind in Richtung der Längsachse des Trägers (19) verlaufende Nuten (26, 27) vorgesehen, die zur Führung eines Kontaktgliedes dienen. Das Kontaktglied setzt sich aus einem Gleitstück (22) aus einem ferromagnetischen Werkstoff und zwei Schleifkontakten (15, 16) zusammen. Die Widerstandsbahn (13) und der Leiter (18) sind parallel zur Längsachse des Gleitstückes (22) verlaufend in entsprechende Nuten der Teile (19a, 19b) eingeschoben und so zum Gleitstück (22) angeordnet, daß die Widerstandsbahn (13) mit dem Schleifkontakt (15) und der Leiter (18) mit dem Schleifkontakt (16) zusammenwirkt. Das Gleitstück (22) für die Schleifkontakte (15, 16) hat wie in Fig. 2 dargestellt, ein in etwa kreuzförmiges Profil und weist in seinem freien Endbereich einen abgestuften Teil zur Befestigung der federnd an der Widerstandsbahn (13) und dem Leiter (18) anliegenden Schleifkontakte (15, 16) auf.As shown in FIG. 2, the carrier (19) can consist of two identically designed parts (19a) and (19b) arranged symmetrically to one another. The outer contour of the carrier (19) is adapted to the inner wall of the tubular body (6). Grooves (26, 27) are provided in the support (19) in the direction of the longitudinal axis of the support (19) and are used to guide a contact element. The contact member is composed of a slide (22) made of a ferromagnetic material and two sliding contacts (15, 16). The resistance track (13) and the conductor (18) are inserted parallel to the longitudinal axis of the slide (22) in corresponding grooves of the parts (19a, 19b) and arranged to the slide (22) so that the resistance track (13) with the sliding contact (15) and the conductor (18) cooperates with the sliding contact (16). The slide (22) for the sliding contacts (15, 16) has, as shown in Fig. 2, an approximately cruciform profile and has a stepped part in its free end region for fastening the resiliently on the resistance track (13) and the conductor (18th ) adjacent sliding contacts (15, 16).
An die Widerstandsbahn (13) und den Leiter (18) sind elektrische Leitungen (7, 17, 14) angeschlossen, die zu einem auf dem Arbeitszylinder (1) angeordneten Stecker (21) führen.Electrical lines (7, 17, 14) are connected to the resistance track (13) and the conductor (18) and lead to a plug (21) arranged on the working cylinder (1).
Die Funktion der im vorstehenden beschriebenen Einrichtung wird nachfolgend näher erläutert.The function of the device described above is explained in more detail below.
Es wird angenommen, daß über den Druckmittelanschluß (11) Druckmittel in die zweite Druckmittelkammer (12) eingesteuert wird. Der sich in der zweiten Druckmittelkammer (12) aufbauende Druck verschiebt den Kolben (8) nach links in Richtung auf die erste Druckmittelkammer (3) zu. Über den ersten Druckmittelanschluß (2) und die nicht dargestellte Ventileinrichtung baut sich der Druck in der ersten Druckmittelkammer (3) zur Atmosphäre hin ab. Mittels der Magnetkraft des an der Kolbenstange (4) angeordneten als Betätigungsglied dienenden Permanentmagneten (10) wird das als Kontaktglied dienende, die Schleifkontakte (15, 16) tragende Gleitstück (22) berührungslos gegenüber dem Betätigungsglied ebenfalls nach links, vom Deckel (20) des Arbeitszylinders weg bewegt. Die Bewegung des Kontaktgliedes (22, 15, 16) verläuft synchron zur Bewegung des Kolbens (8) und der Kolbenstange (4).It is assumed that pressure medium is introduced into the second pressure medium chamber (12) via the pressure medium connection (11). The pressure building up in the second pressure medium chamber (12) moves the piston (8) to the left in the direction of the first pressure medium chamber (3). The pressure in the first pressure medium chamber (3) decreases to the atmosphere via the first pressure medium connection (2) and the valve device (not shown). By means of the magnetic force of the permanent magnet (10) arranged on the piston rod (4) as the actuating member, the sliding piece (22) serving as the contact member and carrying the sliding contacts (15, 16) is also contactlessly to the left relative to the actuating member, from the cover (20) Working cylinder moved away. The movement of the contact member (22, 15, 16) runs synchronously with the movement of the piston (8) and the piston rod (4).
Durch die Änderung der Lage des Abgriffspunktes auf der Widerstandsbahn wird eine Änderung der von der Widerstandsbahn abgegriffenen Spannung erzielt. Die abgegriffene Spannung wird einer nicht dargestellten Auswerteschaltung zugeführt, welche der jeweiligen Kolbenstellung entsprechende Signale abgibt.By changing the position of the tap point on the resistance path, a change in the voltage tapped from the resistance path is achieved. The tapped voltage is fed to an evaluation circuit, not shown, which emits signals corresponding to the respective piston position.
Da sich das einen ferromagnetischen Werkstoff enthaltende Kontaktglied (22, 15, 16), bedingt durch die Magnetkraft des einen Permanentmagneten enthaltenden Betätigungsgliedes (10), stets auf der Höhe des mit der Kolbenstange (4) verbundenen Betätigungsgliedes befindet, wird die augenblickliche Position des Kolbens mit großer Genauigkeit angezeigt.Since the contact member (22, 15, 16) containing a ferromagnetic material is due to the magnetic force of the one containing a permanent magnet Actuator (10), always at the level of the actuator connected to the piston rod (4), the current position of the piston is displayed with great accuracy.
Fig. 3 zeigt einen Arbeitszylinder mit integriertem Potentiometer, wobei das Betätigungsglied aus einem ferromagnetischen Werkstoff besteht und im Kolben des Arbeitszylinders angeordnet ist. Der besseren Übersicht halber sind die den in Fig. 1 gezeigten Bauteilen gleichen Bauteile mit gleichen Bezugszeichen versehen.Fig. 3 shows a working cylinder with an integrated potentiometer, wherein the actuator consists of a ferromagnetic material and is arranged in the piston of the working cylinder. For the sake of a better overview, the components that are the same as the components shown in FIG. 1 are provided with the same reference symbols.
Gemäß Fig. 3 ist in einem Arbeitszylinder (1) ein mit einer Kolbanstange (4) verbundener Kolben (8) abgedichtet verschiebbar angeordnet. Der Kolben (8) unterteilt den Arbeitszylinder (1) in eine kolbenstangenseitige Druckmittelkammer (3) und eine der ersten Druckmittelkammer (3) gegenüber auf der anderen Seite des Kolbens (8) angeordnete zweite Druckmittelkammer (12). Die beiden Druckmittelkammern (3, 12) sind je über einen Druckmittelanschluß (2) bzw. (11) und eine nicht dargestellte Ventileinrichtung mit einer Druckmittelquelle verbindbar.
Die Kolbenstange (4) weist eine in Richtung ihrer Längsachse verlaufenden, vorzugsweise zylindrische Ausnehmung (5) auf, welche an dem sich in den Zylinder (1) hineinerstreckenden Ende der Kolbenstange (4) beginnt und sich nach Art einer Sackbohrung in Richtung auf den durch eine im Zylinderboden vorgesehene Ausnehmung (24) aus dem Arbeitszylinder (1) herausgeführten Endbereich der Kolbenstange (4) zu erstreckt. Der Kolben (8) und die Kolbenstange (4) sind so ausgebildet und so miteinander verbunden, daß das innerhalb des Arbeitszylinders (1) liegende Ende der Kolbenstange (4) zentrisch durch den Kolben (8) hindurchgeführt ist und mit der die zweite Druckmittelkammer (12) begrenzenden Seite des Kolbens (8) abschließt.According to FIG. 3, a piston (8) connected to a piston rod (4) is arranged displaceably and sealed in a working cylinder (1). The piston (8) divides the working cylinder (1) into a piston rod-side pressure medium chamber (3) and a second pressure medium chamber (12) arranged opposite the first pressure medium chamber (3) on the other side of the piston (8). The two pressure medium chambers (3, 12) can each be connected to a pressure medium source via a pressure medium connection (2) or (11) and a valve device (not shown).
The piston rod (4) has a preferably cylindrical recess (5) running in the direction of its longitudinal axis, which begins at the end of the piston rod (4) extending into the cylinder (1) and moves in the manner of a blind bore in the direction of the through a recess (24) provided in the cylinder bottom extends from the end region of the piston rod (4) which is led out of the working cylinder (1). The piston (8) and the piston rod (4) are designed and connected to one another in such a way that the end of the piston rod (4) inside the working cylinder (1) is guided centrally through the piston (8) and ends with the side of the piston (8) delimiting the second pressure medium chamber (12).
Am Deckel (20) des Arbeitszylinders (1) ist koaxial zur Kolbenstange (4) ein rohrförmiger Körper (6) aus einem nichtmagnetisierbaren Werkstoff, z. B. Aluminium oder Kunststoff, ortsfest angeordnet, welcher sich in die Ausnehmung (5) der Kolbenstange (4) hineinerstreckt. Der rohrförmige Körper (6) ist an seinem in der Ausnehmung (5) der Kolbenstange (4) befindlichen freien Ende von einem Boden (23) verschlossen, so daß der Innenraum des rohrförmigen Körpers (6) gegen die zweite Druckmittelkammer (12) abgeschlossen ist.On the cover (20) of the working cylinder (1) coaxial to the piston rod (4) is a tubular body (6) made of a non-magnetizable material, for. As aluminum or plastic, arranged in a stationary manner, which extends into the recess (5) of the piston rod (4). The tubular body (6) is closed at its free end in the recess (5) of the piston rod (4) by a base (23), so that the interior of the tubular body (6) is closed off from the second pressure medium chamber (12) .
Im rohrförmigen Körper (6) ist ein vorzugsweise aus Kunststoff gefertigter Träger (19) für eine Widerstandsbahn (13) und einen Leiter (18) angeordnet. Die Außenkontur des Trägers (19) ist der Innenwand des rohrförmigen Körpers (6) angepaßt. Der Träger (19) ist zusätzlich als Führungseinrichtung (25) für ein Kontaktglied ausgebildet. Die als Führungsmittel zur Führung des berührungslos unter Einwirkung magnetischer Kräfte von einem Betätigungsglied angetriebenen Kontaktgliedes dienende Führungseinrichtung ist somit ortsfest bezüglich der Widerstandsbahn angeordnet. Sie weist zu diesem Zweck in Richtung ihrer Längsachse verlaufende Nuten auf. Das Kontaktglied setzt sich aus einem als Gleitstück (22) ausgebildeten Permanentmagneten und zwei an diesem angeordneten Schleifkontakten (15,16) zusammen.A carrier (19), preferably made of plastic, for a resistance track (13) and a conductor (18) is arranged in the tubular body (6). The outer contour of the carrier (19) is adapted to the inner wall of the tubular body (6). The carrier (19) is additionally designed as a guide device (25) for a contact member. The guide device which serves as a guide means for guiding the contact element, which is driven by an actuating element in a contactless manner under the influence of magnetic forces, is thus arranged in a stationary manner with respect to the resistance track. For this purpose, it has grooves running in the direction of its longitudinal axis. The contact member is composed of a permanent magnet designed as a sliding piece (22) and two sliding contacts (15, 16) arranged thereon.
An die Widerstandsbahn (13) und den Leiter (18) sind elektrische Leitungen (7,17,14) angeschlossen, die zum einen auf dem Arbeitszylinder (1) angeordneten Stecker (21) führen. Der Kolben (8) weist ein ferromagnetisches Element (9a) auf, welches zur Betätigung bzw. zur Mitnehmung des Gleitstückes (22) dient.Electrical lines (7, 17, 14) are connected to the resistance track (13) and the conductor (18) and lead to the plug (21) arranged on the working cylinder (1). The piston (8) has a ferromagnetic element (9a) which serves to actuate or to take the slide (22).
Es ist nicht erforderlich, am Kolben einen gesonderten scheibenförmigen Körper als Betätigungsglied anzuordnen, wenn der Kolben selbst aus einem scheibenförmigen Träger aus einem ferromagnetischen Werkstoff, wie z. B. Stahl, und einem den Träger ringförmig umgebenden Dichtelement besteht.It is not necessary to arrange a separate disk-shaped body as an actuator on the piston if the piston itself is made of a disk-shaped carrier made of a ferromagnetic material, such as, for. B. steel, and a ring-shaped sealing element surrounding the carrier.
Die Funktion der im vorstehenden beschriebenen Einrichtung ist die gleiche wie die der Einrichtung gemäß Fig. 1. Jedoch besteht das Betätigungsglied in diesem Fall aus einem ferromagnetischen Werkstoff bzw. enthält einen ferromagnetischen Werkstoff wogegen das Kontaktglied aus einem magnetischen Werkstoff besteht bzw. einen magnetischen Werkstoff enthält.The function of the device described above is the same as that of the device according to FIG. 1. However, in this case the actuating member consists of a ferromagnetic material or contains a ferromagnetic material, whereas the contact member consists of a magnetic material or contains a magnetic material .
Fig. 4 zeigt einen Teil eines Arbeitszylinders, der sich aus einem Zylinder (39), einem Boden (33) einem Deckel (25) sowie einem im Zylinder (39) abgedichtet geführten Kolben (40) mit Kolbenstange (43) zusammensetzt. Der Boden (33) und der Deckel (25) sind an den beiden einander abgewandten Stirnseiten des Zylinders (39) angeordnet und mittels den Boden (33) und den Deckel (25) miteinander verbindenden Zugankern mit dem Zylinder (39) verspannt.Fig. 4 shows a part of a working cylinder, which is composed of a cylinder (39), a bottom (33), a cover (25) and a piston (40) with a piston rod (43) which is sealed in the cylinder (39). The base (33) and the cover (25) are arranged on the two opposite ends of the cylinder (39) and are clamped to the cylinder (39) by means of tie rods connecting the base (33) and the cover (25).
Im Ausführungsbeispiel ist lediglich ein Zuganker (27) dargestellt. Der Zuganker (27) ist einerseits durch eine parallel zur Längsachse des Zylinders (39) verlaufende Bohrung (36), die in einem über den Zylindermantel hinausragenden Teil des Bodens (33) angeordnet ist, und andererseits durch eine parallel zur Längsachse des Zylinders (39) verlaufende Bohrung (26) in einem sich über den Zylindermantel hinausragenden Teil des Deckels (25) hindurchgeführt. Mittels zwei auf die beiden Enden des Zugankers (27) aufgeschraubten Muttern (38, 44) werden der Boden (33) und der Deckel (25) an den Stirnseiten des Zylinders (39) gehalten.In the exemplary embodiment, only one tie rod (27) is shown. The tie rod (27) is on the one hand through a bore (36) running parallel to the longitudinal axis of the cylinder (39), which is arranged in a part of the base (33) protruding beyond the cylinder jacket, and on the other hand through a bore parallel to the longitudinal axis of the cylinder (39 ) extending bore (26) in a part of the cover (25) protruding beyond the cylinder jacket. Using two screwed onto the two ends of the tie rod (27) Nuts (38, 44), the bottom (33) and the cover (25) are held on the end faces of the cylinder (39).
Der Zuganker (27) weist eine in Richtung seiner Längsachse verlaufende Ausnehmung (29) auf, in welcher ein aus Widerstandsbahn (28), Rückführung (31) und Kontaktglied (30) bestehendes Potentiometer angeordnet ist. Das Gehäuse des Potentiometers wird vom Zuganker (27) gebildet. Das als Schleifkontakt ausgebildete Kontaktglied (30) besteht aus einem ferromagnetischen Werkstoff. Als Betätigungsglied für das Kontaktglied (30) dienen am Kolben (40) angeordnete Permanentmagnete (41, 42). Die Widerstandsbahn (28) und die Rückführung (31) des Potentiometers sind über Anschlußdrähte (34, 35) mit einem Stecker (32), der am Boden (33) des Arbeitszylinders angeordnet ist, verbunden.The tie rod (27) has a recess (29) running in the direction of its longitudinal axis, in which a potentiometer consisting of a resistance track (28), feedback (31) and contact element (30) is arranged. The housing of the potentiometer is formed by the tie rod (27). The contact member (30) designed as a sliding contact consists of a ferromagnetic material. Permanent magnets (41, 42) arranged on the piston (40) serve as the actuating element for the contact element (30). The resistance track (28) and the feedback (31) of the potentiometer are connected via connecting wires (34, 35) to a plug (32) which is arranged on the bottom (33) of the working cylinder.
Es ist selbstverständlich auch möglich, ein bereits mit einem Gehäuse versehenes Potentiometer in der Ausnehmung des Zugankers anzuordnen. In einem solchen Fall ist es nicht notwendig, die im Zuganker angeordnete Ausnehmung zur Aufnahme des Potentiometers zu verschließen, um daß Eindringen von Schmutz und Feuchtigkeit in das Potentiometer zu verhindern.It is of course also possible to arrange a potentiometer already provided with a housing in the recess of the tie rod. In such a case, it is not necessary to close the recess arranged in the tie rod for receiving the potentiometer in order to prevent dirt and moisture from penetrating into the potentiometer.
Die Erfindung erstreckt sich selbstverständlich nicht nur auf die beschriebenen Ausführungsbeispiele, sondern läßt eine Vielzahl von Varianten zu.The invention naturally extends not only to the exemplary embodiments described, but also permits a large number of variants.
Es ist beispielsweise möglich, das Kontaktglied und das Betätigungsglied mit wenigstens je einem Permanentmagneten zu versehen. Das Kontaktglied kann selbsttragend ausgebildet sein, so daß auf einen Träger für die Schleifkontakte verzichtet werden kann. In einer solchen Ausführungsart bestehen die Kontakte (wie z. B. Schleifkontakte) entweder aus einem ferromagnetischen Werkstoff oder aus einem magnetischen Werkstoff und sind derart geformt, daß sie verdreh- und kippsicher an der Widerstandsbahn entlangführbar sind.For example, it is possible to provide the contact member and the actuating member with at least one permanent magnet each. The contact member can be self-supporting, so that a support for the sliding contacts can be dispensed with. In such an embodiment, the contacts (such as sliding contacts) either consist of a ferromagnetic material or made of a magnetic material and are shaped in such a way that they can be guided along the resistance track in a manner such that they cannot twist and tip over.
Die Erfindung läßt sich sowohl bei einem Potentiometer als auch bei einem veränderbaren Widerstand anwenden. Die einzelnen Bauteile des Potentiometers bzw. des veränderbaren Widerstandes können in einem Gehäuse angeordnet sein, so daß eine unabhängige Einrichtung entsteht, die sich für die unterschiedlichsten Zwecke an Geräten und Einrichtungen anbauen oder einbauen läßt. Als Betätigungsglied kann bei einer solchen selbständigen Einrichtung (Potentiometer, veränderbarer Widerstand) auf dem z. B. die Widerstandsbahn und das Kontaktglied enthaltenden Gehäuse verschiebbar ein ringförmiger Körper, der einen Permanentmagneten oder ein ferromagnetisches Teil enthält, angeordnet sein.The invention can be applied both to a potentiometer and to a variable resistor. The individual components of the potentiometer or the variable resistor can be arranged in a housing, so that an independent device is created which can be attached to or installed in devices and equipment for a wide variety of purposes. As an actuator in such an independent device (potentiometer, variable resistance) on the z. B. the resistor track and the contact member-containing housing slidably an annular body containing a permanent magnet or a ferromagnetic part may be arranged.
Claims (5)
- Potentiometer arrangement for monitoring the position of the piston of a working cylinder operated by pressure medium, with a resistance path and a contact member displaceably guided along the resistance path, which contact member is displaceable in a non-contacting manner by way of permanent magnetic coupling members, characterised in that- for integral incorporation in a working cylinder (1), the resistance path and the contact member (22, 15, 16) are located within a tubular member (6), sealed hermetically with respect to the pressure medium by means of a base (23), within the cylinder chamber,- the tubular member (6) is connected by its end side lying opposite the base (23), to one of the cylinder covers (20) of the working cylinder (1) and consists of a non-magnetizable material, and- the piston rod (4) of the working cylinder (1) is provided with a blind bore (5) extending in the axial direction and receiving the tubular member (6) in each displacement position of the piston (8).
- Potentiometer arrangement according to Claim 1, characterised in that the contact member (22, 15, 16) comprises a sliding member (22) of a ferromagnetic material and the piston rod (4) is provided at its end with a permanent magnet (10).
- Potentiometer arrangement according to Claim 1, characterised in that a contact member (22, 15, 16) comprises a sliding member (22) of a permanent magnetic material and the piston (8) is provided with a ferromagnetic member.
- Potentiometer arrangement according to Claim 3, characterised in that the piston (8) itself consists of a disc-like support of a ferromagnetic material and a sealing member surrounding the support in an annular manner.
- Potentiometer arrangement for monitoring the position of the piston of a working cylinder operated by pressure medium, with a resistance path and a contact member displaceably guided along the resistance path, which contact member is displaceable in a non-contacting manner by way of permanent magnetic coupling members, for a working cylinder, which comprises a piston connected to a piston rod and a base and cover connected by means of tie-rods, characterised in that the tie-rod (27) comprises a recess (29) extending in the axial direction, that located in the recess (29) is the resistance path (28) and the displaceably guided contact member (30) and that the actuating member (41, 42) for the contact member (30) is located on the piston (40).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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AT87112533T ATE77711T1 (en) | 1986-11-15 | 1987-08-28 | POTENTIOMETER OR VARIABLE RESISTANCE. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE3639150 | 1986-11-15 | ||
DE19863639150 DE3639150A1 (en) | 1986-11-15 | 1986-11-15 | POTENTIOMETER OR CHANGEABLE RESISTANCE |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0268030A2 EP0268030A2 (en) | 1988-05-25 |
EP0268030A3 EP0268030A3 (en) | 1989-11-29 |
EP0268030B1 true EP0268030B1 (en) | 1992-06-24 |
Family
ID=6314078
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP87112533A Expired - Lifetime EP0268030B1 (en) | 1986-11-15 | 1987-08-28 | Potentiometer or adjustable resistorce |
Country Status (4)
Country | Link |
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US (1) | US4910491A (en) |
EP (1) | EP0268030B1 (en) |
AT (1) | ATE77711T1 (en) |
DE (2) | DE3639150A1 (en) |
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DE4015720A1 (en) * | 1990-05-16 | 1992-04-09 | Helag Electronic Gmbh | ELECTRICAL TRAVEL OR ANGLE SENSOR |
DE4105703A1 (en) * | 1991-02-21 | 1992-08-27 | Mannesmann Ag | POTENTIOMETER DEVICE |
DE4105702A1 (en) * | 1991-02-21 | 1992-09-03 | Mannesmann Ag | LINEAR SENSOR |
DE4141739A1 (en) * | 1991-12-13 | 1993-06-17 | Mannesmann Ag | Method for operating resistive displacement measuring unit e.g. potentiometer - using movable system elements e.g. piston and rods in cylinder and measuring unit before first working operation is calibrated positionally |
US5589664A (en) * | 1993-09-21 | 1996-12-31 | Temper Corporation | Apparatus for containing electrical components for sensing or measuring magnetic fields |
DE19606609A1 (en) * | 1996-02-22 | 1997-08-28 | Claas Ohg | Hydraulic steering device for self propelled drive machines e.g. forest harvesters or lawn mowers |
EP1264991B1 (en) * | 2001-06-07 | 2009-10-28 | Gefran S.p.A. | Arrangement of a position sensor in a cylinder-piston unit |
DE102007046139A1 (en) * | 2007-09-27 | 2009-04-02 | Deere & Company, Moline | Measuring device and measuring method |
US11248427B2 (en) | 2018-08-06 | 2022-02-15 | Schlumberger Technology Corporation | Systems and methods for manipulating wellbore completion products |
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---|---|---|---|---|
JPS5821126Y2 (en) * | 1976-08-06 | 1983-05-04 | 電気音響株式会社 | potentiometer |
US4125821A (en) * | 1977-08-05 | 1978-11-14 | Denki Onkyo Company, Limited | Potentiometer providing a non-linear output |
JPS5487561A (en) * | 1977-12-23 | 1979-07-12 | Aisin Seiki | Oil level detector |
JPS57162405A (en) * | 1981-03-31 | 1982-10-06 | Kogyo Gijutsuin | Noncontact potentiometer |
DE3149516A1 (en) * | 1981-12-14 | 1983-07-07 | Wabco Steuerungstechnik GmbH & Co, 3000 Hannover | Device for detecting the piston position of a cylinder |
DE3241525A1 (en) * | 1982-11-10 | 1984-05-10 | Wabco Westinghouse Steuerungstechnik GmbH & Co, 3000 Hannover | DEVICE FOR DETECTING THE POSITION OR / AND SPEED OF THE PISTON OF A WORK CYLINDER |
US4479107A (en) * | 1982-11-24 | 1984-10-23 | Cts Corporation | Precision linear potentiometer sensor |
SE436072B (en) * | 1983-03-22 | 1984-11-05 | Hara Ab | POTENTIOMETER DEVICE FOR DETERMINATION OF PHYSICAL HYDRAULIC PISTONS AND SIMILAR |
DE3325400C2 (en) * | 1983-07-14 | 1986-04-10 | Integral Hydraulik & Co, 4000 Düsseldorf | Hydraulic cylinder with internal path conversion |
JPS6160135U (en) * | 1984-09-27 | 1986-04-23 | ||
DE3520199A1 (en) * | 1984-10-05 | 1986-04-10 | Wabco Westinghouse Steuerungstechnik GmbH & Co, 3000 Hannover | POTENTIOMETER |
DE3442879C2 (en) * | 1984-11-24 | 1994-09-01 | Wabco Vermoegensverwaltung | Means for detecting the relative position of two parts movable relative to each other |
-
1986
- 1986-11-15 DE DE19863639150 patent/DE3639150A1/en not_active Withdrawn
-
1987
- 1987-08-28 AT AT87112533T patent/ATE77711T1/en not_active IP Right Cessation
- 1987-08-28 DE DE8787112533T patent/DE3780001D1/en not_active Expired - Fee Related
- 1987-08-28 EP EP87112533A patent/EP0268030B1/en not_active Expired - Lifetime
- 1987-11-06 US US07/118,363 patent/US4910491A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP0268030A3 (en) | 1989-11-29 |
EP0268030A2 (en) | 1988-05-25 |
ATE77711T1 (en) | 1992-07-15 |
DE3639150A1 (en) | 1988-05-19 |
US4910491A (en) | 1990-03-20 |
DE3780001D1 (en) | 1992-07-30 |
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