EP0866306B1 - Displacement transducer for a cylinder-piston unit - Google Patents
Displacement transducer for a cylinder-piston unit Download PDFInfo
- Publication number
- EP0866306B1 EP0866306B1 EP98102493A EP98102493A EP0866306B1 EP 0866306 B1 EP0866306 B1 EP 0866306B1 EP 98102493 A EP98102493 A EP 98102493A EP 98102493 A EP98102493 A EP 98102493A EP 0866306 B1 EP0866306 B1 EP 0866306B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- friction wheel
- piston rod
- measuring system
- housing
- distance measuring
- 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
-
- 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
Definitions
- the invention relates to a position measuring system for cylinder-piston assemblies by means of a friction wheel that rolls on the piston rod and whose rotation is detected by a transducer and passed on as a measure of the path or position of the piston rod.
- Such position measuring systems make it possible in a simple manner to determine the adjustment path of cylinder-piston units and thus, for example, the height of a lifting platform, the angle of inclination of a tilting device or the like.
- the friction wheel is in contact with the piston rod so that a translatory movement of the piston rod is converted into a rotary movement of the friction wheel.
- a measuring system with the features of the preamble of claim 1 is known from DE-A-31 19 829.
- the measuring system is designed as an independent unit that can be added to the Cyliner piston unit can be mounted.
- the friction wheel arranged in a chamber protrudes with its shaft out of the chamber and carries a sensor there.
- the object of the present invention is to provide a position measuring system which also works reliably in long-term use. Furthermore, the construction should be inexpensive to manufacture and easy to maintain and, last but not least, be retrofittable for existing cylinder-piston units. In addition, the position measuring system according to the invention is to be distinguished by a compact design.
- This object is achieved in that the transmitter is arranged inside the friction wheel.
- the chamber of the displacement measuring system is expediently arranged at least partially at one end of a plug-in or screw-in housing. With this housing, the position measuring system can then be easily attached to the cylinder-piston unit. This also results in easy maintenance of the measuring system.
- the housing should furthermore have a pressure device for pressing the friction wheel against the piston rod.
- a pressure device for pressing the friction wheel against the piston rod This can advantageously be achieved in that the friction wheel is mounted in a piston which is guided in the housing such that it can be displaced radially to the piston rod and is acted upon by a spring element.
- the measuring system forms a compact, clear, easy-to-use and easy-to-maintain complete unit.
- the sensor inside the friction wheel it is also advisable to design the sensor inside the friction wheel as an incremental measuring system.
- a guide bushing for the piston rod in particular the already existing terminal guide bushing of the cylinder, has proven to be the most favorable location for the positioning of the friction wheel, since existing seals can be used here and at the same time a reduction in the piston stroke is avoided.
- the guide bushing then has a corresponding, preferably radially running bore.
- cylinder-piston units are used simultaneously for a lifting or tilting device, it is advisable to use a displacement measuring system according to the invention on more than one or all of these units, so that there is an overall system that is redundant or for synchronization, especially for Synchronous control, which cylinder-piston units can be used.
- the cylinder-piston unit shown in Figure 1 has a cylinder 1, which can be articulated at one end by means of a base plate 2 to a support frame, not shown.
- a piston rod 3 which can be moved in a straight line in the cylinder, protrudes from it.
- a head part 4 At the end of the piston rod 3 located outside the cylinder 1 there is a head part 4, via which the piston rod 3 can act on elements of a lifting or swiveling device to be moved.
- the cylinder 1 is closed by a guide bush 5.
- a displacement measuring system 6 is screwed into the guide bushing 5, which carries at its piston end a friction wheel 7 shown in FIG. 1a.
- This friction wheel is located in a chamber formed from areas of a housing 8 of the displacement measuring system 6 and the guide bush 5.
- the chamber is sealed against the overpressure in the cylinder 1 by seals 5a, 5b on the cylinder side of the guide bush 5.
- the chamber is protected from the ingress of contaminants from the outside by a further seal 5c.
- the displacement measuring system 6 is partially cut open.
- the parts of the displacement measuring system 6 are located in the screw-in housing 8 or are held together by this.
- the screw-in housing 8 has on its side facing the piston rod 3 a thread 9 with which it is screwed into a corresponding counter-thread in the guide bush 5. The penetration of contaminants from the environment prevents an O-ring to be inserted into the groove 10. After screwing in the housing 8, it is secured in the guide bush 5 by a lock nut 11.
- the housing 8 is approximately L-shaped, with the friction wheel 7, a sensor 12 and a friction wheel and sensor bearing in one leg 13 are arranged.
- the second part of the housing 8 adjoins this leg at right angles, in the interior 14 of which there is space for evaluation electronics (not shown).
- An outer wall of this interior 14 forms a cover 16 with the interposition of a seal 15.
- the friction wheel 7, which partially protrudes from the housing 8, is now essential.
- the ratio between the present in the housing 8 and projecting portion of the friction wheel 7 is adjusted by moving the friction wheel according to the distance between the housing 8 and the piston rod 3, so that the friction wheel 7 is always tight enough against the piston rod 3 to one for his Twist to achieve sufficient rolling friction.
- the displacement is carried out in that the friction wheel 7 is mounted on the friction wheel bearing 13, which in turn is pushed forward in the housing 8 by a compression spring 17.
- the compression spring 17 extends perpendicular to the piston rod 3 and is clamped between the outer wall of the housing 8 that is furthest from the piston rod 3 and the friction wheel bearing 13.
- the friction wheel bearing 13 acts in the rear area as a piston in the correspondingly cylindrical housing 8, while in the front area it has a recess for receiving the friction wheel 7.
- the friction wheel 7 has a flat running surface and an approximately hemispherical region which adjoins it in the direction of the axis of rotation and which forms the floating bearing of the friction wheel.
- the sensor 12 Inside the friction wheel 7 is the sensor 12, which detects the rotation of the friction wheel and forwards it as a measure of the path or the position of the piston rod via cables to be laid in a channel 19 of the friction wheel bearing 13 to the evaluation electronics to be accommodated in the interior 14.
- FIG. 3 corresponds to the one described above with the exception of the fact that the interior for the evaluation electronics 14 'is not arranged perpendicular to the rest of the housing 8' here, but extends in its extension. This results in a longer and narrower design of the measuring system.
- the hemispherical shape of the friction wheel 7 can be seen particularly well in addition to its running surface in the two embodiments of the displacement measuring system 6, 6 '.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Actuator (AREA)
- A Measuring Device Byusing Mechanical Method (AREA)
- Forklifts And Lifting Vehicles (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
Description
Die Erfindung betrifft ein Wegmeßsystem für Zylinder-Kolben-Aggregate mittels eines Reibrades, das an der Kolbenstange abrollt und dessen Verdrehung von einem Meßwertgeber erfaßt und als Maß für den Weg oder die Position der Kolbenstange weitergegeben wird.The invention relates to a position measuring system for cylinder-piston assemblies by means of a friction wheel that rolls on the piston rod and whose rotation is detected by a transducer and passed on as a measure of the path or position of the piston rod.
Solche Wegmeßsysteme erlauben es auf einfache Weise, den Verstellweg von Zylinder-Kolben-Aggregaten und damit zum Beispiel die Höhe einer Hebebühne, den Neigungswinkel einer Kippvorrichtung oder dergleichen zu bestimmen. Das Reibrad steht dabei in Kontakt mit der Kolbenstange, so daß eine translatorische Bewegung der Kolbenstange in eine rotatorische des Reibrades umgesetzt wird. Für eine zuverlässige Umsetzung ist es dabei wichtig, daß zwischen dem Reibrad und der sehr glatten Kolbenstange ausreichende Reibverhältnisse herrschen, was insofern zum Problem werden kann, als sich mit der Zeit Verschmutzungen an der Kolbenstange niederschlagen und von dort auf das Reibrad übertragen werden. Dies führt zu einer Verfälschung der Wegmessung, woraus angesichts der hohen Kräfte und großen Lasten, für die Zylinder-Kolben-Aggregate in der Regel zum Einsatz kommen, schwerwiegende und gefährliche Folgen resultieren können.Such position measuring systems make it possible in a simple manner to determine the adjustment path of cylinder-piston units and thus, for example, the height of a lifting platform, the angle of inclination of a tilting device or the like. The friction wheel is in contact with the piston rod so that a translatory movement of the piston rod is converted into a rotary movement of the friction wheel. For a reliable implementation, it is important that there is sufficient friction between the friction wheel and the very smooth piston rod, which can become a problem insofar as dirt builds up on the piston rod over time and is transferred from there to the friction wheel. This leads to a falsification of the distance measurement, which can result in serious and dangerous consequences in view of the high forces and high loads for which cylinder-piston units are generally used.
Ein Wegmeßsystem mit den Merkmalen des Oberbegriffes von Patentanspruch 1 ist durch die DE-A-31 19 829 bekannt. Dabei ist das Meßsystem als eigenständige Baueinheit ausgebildet, die nachträglich an dem Zyliner-Kolben-Aggregat montiert werden kann. Das in einer Kammer angeordnete Reibrad ragt mit seiner Welle aus der Kammer heraus und trägt dort einen Meßwertgeber.A measuring system with the features of the preamble of claim 1 is known from DE-A-31 19 829. The measuring system is designed as an independent unit that can be added to the Cyliner piston unit can be mounted. The friction wheel arranged in a chamber protrudes with its shaft out of the chamber and carries a sensor there.
Davon ausgehend besteht die Aufgabe der vorliegenden Erfindung darin, ein Wegmeßsystem zur Verfügung zu stellen, das auch im Langzeiteinsatz zuverlässig arbeitet. Weiterhin soll die Konstruktion kostengünstig herzustellen und einfach zu warten sein und nicht zuletzt auch für bestehende Zylinder-Kolben-Aggregate nachrüstbar sein. Außerdem soll sich das erfindungsgemäße Wegmeßsystem durch kompakte Bauweise auszeichnen.Based on this, the object of the present invention is to provide a position measuring system which also works reliably in long-term use. Furthermore, the construction should be inexpensive to manufacture and easy to maintain and, last but not least, be retrofittable for existing cylinder-piston units. In addition, the position measuring system according to the invention is to be distinguished by a compact design.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß der Meßwertgeber im Inneren des Reibrades angeordnet ist.This object is achieved in that the transmitter is arranged inside the friction wheel.
Hierdurch ergibt sich eine besonders kompakte Bauform, weil kein zusätzlicher Platz für den Meßwertgeber benötigt wird. Außerdem wird der Meßwertgeber vor Verschmutzungen geschützt, weil die das Reibrad aufnehmende Kammer durch an der Kolbenstange anliegende Dichtungen abgedichtet ist.This results in a particularly compact design because no additional space is required for the transmitter. In addition, the transmitter is protected from contamination because the chamber that receives the friction wheel is sealed by seals that rest against the piston rod.
Für eine Nachrüstung bestehender Zylinder-Kolben-Aggregate ist die Kammer des Wegmeßsystems zweckmäßigerweise zumindest teilweise an einem Ende eines Einsteck- oder Einschraubgehäuses angeordnet ist. Mit diesem Gehäuse läßt sich das Wegmeßsystem dann sehr einfach am Zylinder-Kolben-Aggregat anbringen. Dadurch ergibt sich auch eine leichte Wartung des Wegmeßsystems.For retrofitting existing cylinder-piston units, the chamber of the displacement measuring system is expediently arranged at least partially at one end of a plug-in or screw-in housing. With this housing, the position measuring system can then be easily attached to the cylinder-piston unit. This also results in easy maintenance of the measuring system.
Um in jeder Situation einen für eine Rollreibung auf der glatten Kolbenstange ausreichenden Anpreßdruck zu erzielen, sollte das Gehäuse weiterhin eine Anpreßeinrichtung zum Andrücken des Reibrades an die Kolbenstange aufweisen. Diese kann vorteilhaft dadurch realisiert werden, daß das Reibrad in einem Kolben gelagert ist, der radial zur Kolbenstange verschiebbar in dem Gehäuse geführt und durch ein Federelement beaufschlagt ist.In order to achieve a contact pressure sufficient for rolling friction on the smooth piston rod in every situation, the housing should furthermore have a pressure device for pressing the friction wheel against the piston rod. This can advantageously be achieved in that the friction wheel is mounted in a piston which is guided in the housing such that it can be displaced radially to the piston rod and is acted upon by a spring element.
Wenn weiterhin das Gehäuse die Auswertelektronik für die vom Meßwertgeber abgegebenen Signale enthält, bildet das Wegmeßsystem eine kompakte, übersichtliche, leicht handhabbare und einfach zu wartende Komplett-Einheit. Für eine noch kompaktere Bauform empfiehlt es sich zusätzlich, den Meßwertgeber im Inneren des Reibrades als inkrementales Meßsystem auszubilden.If the housing continues the electronics for the from the transmitter contained signals, the measuring system forms a compact, clear, easy-to-use and easy-to-maintain complete unit. For an even more compact design, it is also advisable to design the sensor inside the friction wheel as an incremental measuring system.
Als günstigster Ort für die Positionierung des Reibrades hat sich eine Führungsbuchse für die Kolbenstange, insbesondere die ohnehin vorhandene endständige Führungsbuchse des Zylinders erwiesen, da hier auf vorhandene Dichtungen zurückgegriffen werden kann und gleichzeitig eine Verringerung des Kolbenhubes vermieden wird. Zum Anschluß des Wegmeßsystems weist die Führungsbuchse dann eine entsprechende, vorzugsweise radial verlaufende Bohrung auf.A guide bushing for the piston rod, in particular the already existing terminal guide bushing of the cylinder, has proven to be the most favorable location for the positioning of the friction wheel, since existing seals can be used here and at the same time a reduction in the piston stroke is avoided. To connect the position measuring system, the guide bushing then has a corresponding, preferably radially running bore.
Werden mehrere Zylinder-Kolben-Aggregate gleichzeitig für eine Huboder Kippvorrichtung eingesetzt, so empfiehlt es sich an mehr als einem bzw. allen dieser Aggregate ein erfindungsgemäßes Wegmeßsystem einzusetzen, so daß sich ein Gesamtsystem ergibt, das redundant ist bzw. zur Synchronisierung, vor allem zur Gleichlaufsteuerung, der Zylinder-Kolben-Aggregate eingesetzt werden kann.If several cylinder-piston units are used simultaneously for a lifting or tilting device, it is advisable to use a displacement measuring system according to the invention on more than one or all of these units, so that there is an overall system that is redundant or for synchronization, especially for Synchronous control, which cylinder-piston units can be used.
Weitere Merkmale und Eigenschaften der Erfindung ergeben sich aus der nachfolgenden Beschreibung zweier Ausführungsbeispiele anhand der Zeichnung; dabei zeigt
- Figur 1
- die Anordnung einer ersten Ausführungsform des Wegmeßsystems an einem Zylinder-Kolben-Aggregates;
- Figur 1a
- das Wagmeßsystem zwischen den Dichtungen;
- Figur 2
- die Ausführungsform nach Figur 1 in einer vergrößerten schrägen Schnittansicht;
- Figur 3
- eine alternative Ausführungsform in einer schrägen Schnittansicht;
- Figur 4
- die Ausführungsform nach Figur 1 vom Zylinder aus gesehen;
- Figur 5
- die Ausführungsform nach Figur 3 von der Seite; und
- Figur 6
- die Reibradlagerung.
- Figure 1
- the arrangement of a first embodiment of the position measuring system on a cylinder-piston unit;
- Figure 1a
- the weighing system between the seals;
- Figure 2
- the embodiment of Figure 1 in an enlarged oblique sectional view;
- Figure 3
- an alternative embodiment in an oblique sectional view;
- Figure 4
- the embodiment of Figure 1 seen from the cylinder;
- Figure 5
- the embodiment of Figure 3 from the side; and
- Figure 6
- the friction wheel storage.
Das in Figur 1 dargestellte Zylinder-Kolben-Aggregat weist einen Zylinder 1 auf, der an seinem einen Ende mittels einer Bodenplatte 2 an einem nicht gezeichneten Traggestell angelenkt werden kann. Auf der der Bodenplatte 2 gegenüberliegenden Seite des Zylinders 1 ragt aus ihm eine im Zylinder geradlinig verfahrbare Kolbenstange 3 hervor. Am außerhalb des Zylinders 1 befindlichen Ende der Kolbenstange 3 befindet sich ein Kopfteil 4, über das die Kolbenstange 3 auf zu bewegende Elemente einer Hub- oder Schwenkvorrichtung einwirken kann. Am Austrittsende der Kolbenstange 3 ist der Zylinder 1 durch eine Führungsbuchse 5 abgeschlossen.The cylinder-piston unit shown in Figure 1 has a cylinder 1, which can be articulated at one end by means of a base plate 2 to a support frame, not shown. On the side of the cylinder 1 opposite the base plate 2, a piston rod 3, which can be moved in a straight line in the cylinder, protrudes from it. At the end of the piston rod 3 located outside the cylinder 1 there is a head part 4, via which the piston rod 3 can act on elements of a lifting or swiveling device to be moved. At the outlet end of the piston rod 3, the cylinder 1 is closed by a guide bush 5.
Wesentlich ist nun, daß in die Führungsbuchse 5 ein Wegmeßsystem 6 eingeschraubt ist, das an seinem kolbenseitigen Ende ein in Figur 1a dargestelltes Reibrad 7 trägt. Dieses Reibrad befindet sich in einer aus Bereichen eines Gehäuses 8 des Wegmeßsystems 6 und der Führungsbuchse 5 gebildeten Kammer. Die Kammer ist durch zylinderseitige Dichtungen 5a, 5b der Führungsbuchse 5 gegenüber dem Überdruck im Zylinder 1 abgedichtet. An dem dem Kopfteil 4 zugewandten Ende der Führungsbuchse 5 wird die Kammer durch eine weitere Dichtung 5c gegenüber dem Eindringen von Verunreinigungen von außen geschützt.It is now essential that a displacement measuring system 6 is screwed into the guide bushing 5, which carries at its piston end a friction wheel 7 shown in FIG. 1a. This friction wheel is located in a chamber formed from areas of a housing 8 of the displacement measuring system 6 and the guide bush 5. The chamber is sealed against the overpressure in the cylinder 1 by seals 5a, 5b on the cylinder side of the guide bush 5. At the end of the guide bush 5 facing the head part 4, the chamber is protected from the ingress of contaminants from the outside by a further seal 5c.
In Figur 2 ist das Wegmeßsystem 6 nach Figur 1 teilweise aufgeschnitten. Die Teile des Wegmeßsystems 6 befinden sich in dem Einschraubgehäuse 8 bzw. werden durch dieses zusammengehalten. Das Einschraubgehäuse 8 weist an seiner der Kolbenstange 3 zugewandten Seite ein Gewinde 9 auf, mit dem es in ein entsprechendes Gegengewinde in der Führungsbuchse 5 eingeschraubt wird. Das Eindringen von Verunreinigungen aus der Umgebung verhindert ein in die Nut 10 einzulegender O-Ring. Nach dem Einschrauben des Gehäuses 8 wird es durch eine Kontermutter 11 in der Führungsbuchse 5 gesichert.In Figure 2, the displacement measuring system 6 according to Figure 1 is partially cut open. The parts of the displacement measuring system 6 are located in the screw-in housing 8 or are held together by this. The screw-in housing 8 has on its side facing the piston rod 3 a thread 9 with which it is screwed into a corresponding counter-thread in the guide bush 5. The penetration of contaminants from the environment prevents an O-ring to be inserted into the groove 10. After screwing in the housing 8, it is secured in the guide bush 5 by a lock nut 11.
Das Gehäuse 8 ist etwa L-förmig aufgebaut, wobei im einen Schenkel das Reibrad 7, ein Meßwertgeber 12 und eine Reibrad- und Geberlagerung 13 angeordnet sind. An diesen Schenkel schließt sich rechtwinklig der zweite Teil des Gehäuses 8 an, in dessen Innenraum 14 eine nicht dargestellte Auswertungselektronik Platz findet. Eine Außenwand dieses Innenraumes 14 bildet unter Zwischenlage einer Dichtung 15 ein Deckel 16.The housing 8 is approximately L-shaped, with the friction wheel 7, a sensor 12 and a friction wheel and sensor bearing in one leg 13 are arranged. The second part of the housing 8 adjoins this leg at right angles, in the interior 14 of which there is space for evaluation electronics (not shown). An outer wall of this interior 14 forms a cover 16 with the interposition of a seal 15.
Wesentlich ist nun das Reibrad 7, das aus dem Gehäuse 8 teilweise hervorsteht. Das Verhältnis zwischen im Gehäuse 8 befindlichen und vorstehenden Anteil des Reibrades 7 stellt sich durch Verschieben des Reibrades entsprechend dem Abstand zwischen dem Gehäuse 8 und der Kolbenstange 3 ein, so daß das Reibrad 7 immer fest genug an der Kolbenstange 3 anliegt, um eine für seine Verdrehung ausreichende Rollreibung zu erzielen. Das Verschieben wird dadurch vorgenommen, daß das Reibrad 7 an der Reibradlagerung 13 gelagert ist, die ihrerseits im Gehäuse 8 durch eine Druckfeder 17 nach vorn geschoben wird. Die Druckfeder 17 verläuft senkrecht zur Kolbenstange 3 und ist zwischen der von der Kolbenstange 3 entferntesten Außenwand des Gehäuses 8 und Reibradlagerung 13 verspannt. Beim Verschieben ändert sich der Zwischenraum 18 zwischen der Reibradlagerung 13 und der von der Kolbenstange 3 entferntesten Außenwand des Gehäuses 8 entsprechend.The friction wheel 7, which partially protrudes from the housing 8, is now essential. The ratio between the present in the housing 8 and projecting portion of the friction wheel 7 is adjusted by moving the friction wheel according to the distance between the housing 8 and the piston rod 3, so that the friction wheel 7 is always tight enough against the piston rod 3 to one for his Twist to achieve sufficient rolling friction. The displacement is carried out in that the friction wheel 7 is mounted on the friction wheel bearing 13, which in turn is pushed forward in the housing 8 by a compression spring 17. The compression spring 17 extends perpendicular to the piston rod 3 and is clamped between the outer wall of the housing 8 that is furthest from the piston rod 3 and the friction wheel bearing 13. When moving, the space 18 between the friction wheel bearing 13 and the outer wall of the housing 8 furthest from the piston rod 3 changes accordingly.
Die Reibradlagerung 13 fungiert im hinteren Bereich als Kolben in dem entsprechend zylindrisch ausgebildeten Gehäuse 8, während sie im vorderen Bereich eine Aussparung zur Aufnahme des Reibrades 7 hat.The friction wheel bearing 13 acts in the rear area as a piston in the correspondingly cylindrical housing 8, while in the front area it has a recess for receiving the friction wheel 7.
Das Reibrad 7 weist eine ebene Lauffläche und einen in Richtung der Drehachse daran angrenzenden, etwa halbkugelförmigen Bereich auf, der die fliegende Lagerung des Reibrades bildet. Im Inneren des Reibrades 7 befindet sich der Meßwertgeber 12, der die Verdrehung des Reibrades erfaßt und als Maß für den Weg oder die Position der Kolbenstange über in einem Kanal 19 der Reibradlagerung 13 zu verlegende Kabel an die im Innenraum 14 unterzubringende Auswertungselektronik weiterleitet.The friction wheel 7 has a flat running surface and an approximately hemispherical region which adjoins it in the direction of the axis of rotation and which forms the floating bearing of the friction wheel. Inside the friction wheel 7 is the sensor 12, which detects the rotation of the friction wheel and forwards it as a measure of the path or the position of the piston rod via cables to be laid in a channel 19 of the friction wheel bearing 13 to the evaluation electronics to be accommodated in the interior 14.
Das in Figur 3 dargestellte, alternative Ausführungsbeispiel entspricht dem zuvor beschriebenen mit Ausnahme der Tatsache, daß der Innenraum für die Auswertungselektronik 14' hier nicht senkrecht zum Rest des Gehäuses 8' angeordnet ist, sondern in dessen Verlängerung verläuft Dadurch ergibt sich eine längere und schmalere Bauform des Wegmeßsystems.The alternative exemplary embodiment shown in FIG. 3 corresponds to the one described above with the exception of the fact that the interior for the evaluation electronics 14 'is not arranged perpendicular to the rest of the housing 8' here, but extends in its extension. This results in a longer and narrower design of the measuring system.
In den Figuren 4 und 5 läßt sich der halbkugelförmige Verlauf des Reibrades 7 neben seiner Lauffläche in den beiden Ausführungsformen des Wegmeßsystemes 6, 6' besonders gut erkennen.4 and 5, the hemispherical shape of the friction wheel 7 can be seen particularly well in addition to its running surface in the two embodiments of the displacement measuring system 6, 6 '.
In Figur 6 ist der schräge Verlauf des Kabelführungskanales 19 durch die Reibradlagerung 13 gestrichelt angedeutet und die Bohrung 17a für die Druckfeder 17 eingezeichnet.In Figure 6, the oblique course of the cable duct 19 through the friction wheel bearing 13 is indicated by dashed lines and the bore 17a for the compression spring 17 is shown.
Claims (7)
- A distance measuring system (6, 6') for piston/cylinder units by means of a friction wheel (7), which rolls on the piston rod (3) and whose rotation is detected by a sensor (12) and is transmitted as a measure of the travel or the position of the piston rod (3), the friction wheel (7) being arranged in a chamber, which is sealed from the environment by seals (5a, 5b, 5c) engaging the piston rod (3), characterised in that the sensor (12) is arranged in the interior of the friction wheel (7).
- A distance measuring system as claimed in Claim 1, characterised in that the chamber is arranged at least partly at one end of a push-in or screw-in housing (8, 8').
- A distance measuring system as claimed in Claim 2, characterised in that the housing (8, 8') has a pressure device for pressing the friction wheel (7) against the piston rod (3).
- A distance measuring system as claimed in Claim 2, characterised in that the friction wheel is mounted on a friction wheel bearing (13), which is guided to be movable radially with respect to the piston rod (3) within the housing (8, 8') and is acted on by a spring element (17).
- A distance measuring system as claimed in Claim 2, characterised in that the housing (8, 8') contains the electronic analysis system for the signals delivered from the sensor (12).
- A distance measuring system as claimed in Claim 1, characterised in that the friction wheel (7) is arranged in a guide bush for the piston rod (3), particularly in the terminal guide bush (5), of the cylinder, for which purpose the guide bush (5) has an appropriate, preferably radially extending, bore.
- A distance measuring system as claimed in Claim 1, characterised in that the distance measuring systems of different piston/cylinder units are connected to a synchronising controller.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE29704877U DE29704877U1 (en) | 1997-03-19 | 1997-03-19 | Position measuring system for cylinder piston units |
| DE29704877U | 1997-03-19 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0866306A1 EP0866306A1 (en) | 1998-09-23 |
| EP0866306B1 true EP0866306B1 (en) | 2004-04-28 |
Family
ID=8037647
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP98102493A Expired - Lifetime EP0866306B1 (en) | 1997-03-19 | 1998-02-13 | Displacement transducer for a cylinder-piston unit |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0866306B1 (en) |
| AT (1) | ATE265669T1 (en) |
| DE (2) | DE29704877U1 (en) |
| ES (1) | ES2218722T3 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE29715008U1 (en) | 1997-08-22 | 1997-10-02 | Otto Nussbaum GmbH & Co. KG, 77694 Kehl | Transport and storage facility, in particular for motor vehicles |
| DE19823529A1 (en) * | 1998-05-26 | 1999-12-09 | Mannesmann Rexroth Ag | Route determination system |
| DE10242672A1 (en) * | 2002-09-13 | 2004-03-25 | Maha Maschinenbau Haldenwang Gmbh & Co. Kg | Control device for lifting platforms |
| DE102010005336A1 (en) | 2010-01-21 | 2011-07-28 | SITEMA GmbH & Co. KG, 76135 | Method for acquisition of velocity concerning movement of e.g. piston rod to operate clamping unit, involves determining physical movement parameter by evaluation of time displacement between magnetization signals |
| GB2554655B (en) | 2016-09-30 | 2019-10-02 | Caterpillar Inc | A hydraulic actuator arrangement |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3119829A1 (en) * | 1981-05-19 | 1982-12-16 | H. Kuhnke Gmbh Kg, 2427 Malente | Measuring system for measuring the position of the piston rod of a piston/cylinder unit |
| JPS57185909U (en) * | 1981-05-21 | 1982-11-25 | ||
| DE3345791A1 (en) * | 1983-12-17 | 1985-06-27 | Vdo Adolf Schindling Ag, 6000 Frankfurt | CONTACTLESS ELECTRONIC ANGLE SENSOR |
| JP2548650B2 (en) * | 1991-11-28 | 1996-10-30 | 三井造船株式会社 | Surface roughness measurement sensor mounting structure |
| US5488860A (en) * | 1993-12-29 | 1996-02-06 | E-Systems, Inc. | Apparatus for determining the position of a piston in a fluidic actuator |
| DE4445122A1 (en) * | 1994-12-17 | 1996-06-20 | Kemptener Gmbh Maschf | Piston cylinder appts. with e.g. magnet activated sensor |
-
1997
- 1997-03-19 DE DE29704877U patent/DE29704877U1/en not_active Expired - Lifetime
-
1998
- 1998-02-13 EP EP98102493A patent/EP0866306B1/en not_active Expired - Lifetime
- 1998-02-13 DE DE59811255T patent/DE59811255D1/en not_active Expired - Lifetime
- 1998-02-13 AT AT98102493T patent/ATE265669T1/en not_active IP Right Cessation
- 1998-02-13 ES ES98102493T patent/ES2218722T3/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE59811255D1 (en) | 2004-06-03 |
| DE29704877U1 (en) | 1997-04-30 |
| ATE265669T1 (en) | 2004-05-15 |
| EP0866306A1 (en) | 1998-09-23 |
| ES2218722T3 (en) | 2004-11-16 |
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