EP2009292B1 - Pneumatic cylinder with a cylinder casing made from extruded metal - Google Patents

Pneumatic cylinder with a cylinder casing made from extruded metal Download PDF

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Publication number
EP2009292B1
EP2009292B1 EP20080158275 EP08158275A EP2009292B1 EP 2009292 B1 EP2009292 B1 EP 2009292B1 EP 20080158275 EP20080158275 EP 20080158275 EP 08158275 A EP08158275 A EP 08158275A EP 2009292 B1 EP2009292 B1 EP 2009292B1
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EP
European Patent Office
Prior art keywords
channel
pneumatic cylinder
section
cylinder
cylinder according
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EP20080158275
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German (de)
French (fr)
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EP2009292A2 (en
EP2009292A3 (en
Inventor
Heinz-Jürgen Engelke
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP2009292A3 publication Critical patent/EP2009292A3/en
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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
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1428—Cylinders
    • 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
    • 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
    • F15B2215/00—Fluid-actuated devices for displacing a member from one position to another
    • F15B2215/30—Constructional details thereof
    • F15B2215/305—Constructional details thereof characterised by the use of special materials

Definitions

  • the present invention relates to a pneumatic cylinder with a cylinder housing made of extruded metal, which has a central bore for receiving a piston, wherein in the cylinder wall at least one closed channel for accommodating an attachment is provided.
  • the field of application of the present invention extends primarily to long-lasting pneumatic cylinders whose housing consists of extruded aluminum or the like, wherein cylinder cover and cylinder base are screwed as detachable components of the front side of the cylinder housing.
  • pneumatic cylinders have a substantially square outer cross-section and a substantially circular bore for the inner piston.
  • Outside of the cylinder housing or within the wall means for attachment or placement of attachments, such as sensors for detecting the piston position are provided.
  • a generic cylinder housing for a pneumatic cylinder which has a closed channel for accommodating an attachment to avoid the above-described problem.
  • the closed channel is formed within the wall of the cylinder housing. Since the cylinder housing has a substantially square outer cross-section and a circular bore for the piston, the corner region of the cylinder housing offers the formation of the channel. This is generated during extrusion, in the closed channel sensors are housed protected for the detection of the piston position, which can be positioned from the outside via a permanent magnet in their relative position to the cylinder housing.
  • a pneumatic cylinder in which a cylinder bore forming inner tube of a substantially square outer tube is surrounded. In this case arise between the inner tube and the outer tube channel structures that can be used to accommodate attachments.
  • the cross-sectional areas provided for the usable channel structures are here in the corner region of the substantially square outer tube.
  • the invention includes the technical teaching that an inner tube is provided to form a closed channel whose outer cross-section matches as far as the inner cross-section of a pushed-over outer tube that results in the closed channel therebetween.
  • the advantage of the solution according to the invention is, in particular, that a machining of closed channels with difficult geometries is unnecessary. Any cross sections of closed channels can be easily formed by telescoping two extruded metal tubes.
  • the inner tube and outer tube do not necessarily consist of extruded metal.
  • At least one of the tubes can also be made of plastic or the like, as far as the strength appears given. This is especially the case when the outer tube is made of plastic. If this is a transparent plastic, then the position of the mounted in the closed channel attachment can be easily seen from the outside.
  • the attachment is designed as an electrical sensor for detecting the piston position.
  • the channel closed according to the invention can receive one or more such sensors.
  • the electrical sensor is designed in the manner of a film sensor.
  • a film sensor has two contact paths lying opposite one another and separated by a dielectric, which come into contact with one another upon the action of a magnetic field, here a permanent magnet integrated in the piston, so that the position of the piston can be determined via an external resistance measurement.
  • the inner tube is provided in the region of the channel with a straight Kanalgrnnd Design.
  • the film sensor can then be applied in a simple manner, preferably by gluing.
  • the closed channel preferably designed to accommodate a film sensor, slit-like, so can be at a diameter of the bore of less than 100mm, a height of the channel of 0.5 - 10 mm.
  • the upper limit is determined by the geometric dimensions of the attachment to be accommodated.
  • a particular advantage of the inventive solution is that even very small slot widths of up to 0.5 mm can be represented by the solution according to the invention, namely evenly along the entire length of the cylinder housing.
  • foil sensors with a thickness of up to 0.5 mm can be safely accommodated.
  • the slot-like channel can be stepped in height and formed with flat side regions.
  • the smallest height of the flat side areas is up to 0.5 mm.
  • the film sensor can be precisely recorded along its edges, wherein the middle region of greater height leaves sufficient free space for a reliable actuation of the film sensor by the permanent magnet on the piston.
  • the outer cross section of the inner tube and the inner cross section of the outer tube to the region of the channel are circular.
  • This contour can be particularly easy to implement by extrusion production technology and the components designed in this way can also be inserted without difficulty by telescoping.
  • a slight interference fit should be achieved in the collapsed state, so that the components so interconnected are clearly determined location.
  • the inventive solution for forming the closed channel is a prerequisite for the outer cross section of the outer tube may continue to have a smooth square basic shape. In the corner region of the square basic form, sufficient material remains to introduce holes for receiving tie rods or screws.
  • the tie rods or screws are used to attach the cylinder base and cylinder cover and are so far also protected within the outer contour of the cylinder tube housed.
  • the introduced in the inner cylinder of the cylinder housing according to the invention bore for receiving the piston can be made circular or polygonal.
  • a polygonal bore or comparable non-round geometry serves to prevent rotation of the piston displaceable herein.
  • the cylinder housing 1 shown here consists of an inner tube 2 and an outer tube 3, both of which are made of extruded aluminum.
  • the inner tube 2 has a bore 4 for receiving a - not shown - piston.
  • the outer tube 3, however, has a square basic shape with rounded edges.
  • the outer cross section of the inner tube 2 and the inner cross section of the outer tube 3 are circular except for the region of a channel 5.
  • the inner tube 2 is provided in the region of the channel 5 with a straight channel base surface 6.
  • the channel base 6 is used for applying - not shown - film sensor for detecting the piston position.
  • the channel 5 between the interior 2 and outer tube 3 is closed and formed like a slot.
  • the channel 5 is formed by inserting the inner tube 2 in the outer tube 3 via corresponding differences in the cross sections.
  • the bore 4 of the inner cylinder 2 has a polygonal cross-section to prevent rotation.
  • four holes 7 for receiving - not shown - tie rods are introduced.
  • the slot-like channel 5 is stepped in height with flat side portions 8, wherein the two-sided flat side portions 8 have in this embodiment, a height of 0.5 mm to a 0.4 mm wide film sensor edge through Insertion and fix defined herein.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)

Description

Die vorliegende Erfindung betrifft einen Pneumatikzylinder mit einem Zylindergehäuse aus stranggepresstem Metall, welches eine zentrale Bohrung zur Aufnahme eines Kolbens aufweist, wobei in der Zylinderwandung mindestens ein geschlossener Kanal zur Unterbringung eines Anbauteils vorgesehen ist.The present invention relates to a pneumatic cylinder with a cylinder housing made of extruded metal, which has a central bore for receiving a piston, wherein in the cylinder wall at least one closed channel for accommodating an attachment is provided.

Das Einsatzgebiet der vorliegenden Erfindung erstreckt sich vornehmlich auf langbauende Pneumatikzylinder, deren Gehäuse aus stranggepresstem Aluminium oder dergleichen besteht, wobei Zylinderdeckel und Zylinderboden als lösbare Bauteile stirnseitig des Zylindergehäuses angeschraubt sind. Gewöhnlich weisen derartige Pneumatikzylinder einen im Wesentlichen quadratischen Außenquerschnitt sowie eine im Wesentlichen kreisrunde Bohrung für den innenliegenden Kolben auf. Außen am Zylindergehäuse oder innerhalb dessen Wandung sind Mittel zur An- bzw. Unterbringung von Anbauteilen, wie Sensoren zur Detektion der Kolbenstellung vorgesehen.The field of application of the present invention extends primarily to long-lasting pneumatic cylinders whose housing consists of extruded aluminum or the like, wherein cylinder cover and cylinder base are screwed as detachable components of the front side of the cylinder housing. Usually, such pneumatic cylinders have a substantially square outer cross-section and a substantially circular bore for the inner piston. Outside of the cylinder housing or within the wall means for attachment or placement of attachments, such as sensors for detecting the piston position are provided.

Aus der DE 44 29 567 A1 geht ein Pneumatikzylinder hervor, dessen Zylindergehäuse aus einem Strangpressprofil aus Aluminium besteht. Das Strangpressprofil wird entsprechend dem georderten Axialmaß des Zylindergehäuses abgelängt. Von der Stirnseite des Zylindergehäuses her wird die Zylinderbohrung durch Ausdrehen aufgeweitet, so dass stirnseitig eine Innenschulter gebildet wird. Als Zylinderboden wird eine Kreisscheibe, deren Außendurchmesser dem Innendurchmesser der Innenschulter entspricht, verwendet und durch Rollumformen fixiert. Zur Anbringung von Sensoren im Zylindergehäuse sind hier Nuten entlang der Außenoberfläche vorgesehen. Nachteilig hierbei ist, dass in derartige offene Nuten untergebrachte Sensoren gewöhnlich von der Außenoberfläche des Zylindergehäuses abstehen und dadurch eine zerklüftete Außenkontur bilden, die Angriffsstelle für Schmutz und mechanische Beschädigungen bilden. Wird ein Sensor vollständig innerhalb einer solchen Nut untergebracht, so muss die Nut zur Vermeidung von eindringendem Schmutz zusätzlich mit einer Abdeckung geschlossen werden.From the DE 44 29 567 A1 goes out a pneumatic cylinder whose cylinder housing consists of an extruded aluminum. The extruded profile is cut to length according to the ordered axial dimension of the cylinder housing. From the front side of the cylinder housing forth the cylinder bore is widened by unscrewing, so that the front side an inner shoulder is formed. As a cylinder bottom, a circular disk whose outer diameter corresponds to the inner diameter of the inner shoulder, used and fixed by roll forming. For mounting sensors in the cylinder housing here are grooves provided along the outer surface. The disadvantage here is that in such open grooves housed sensors usually protrude from the outer surface of the cylinder housing and thereby form a ragged outer contour, which form the point of attack for dirt and mechanical damage. If a sensor is completely housed within such a groove, the groove must also be closed with a cover to prevent ingress of dirt.

Aus der EP 1 255 045 B1 geht ein gattungsgemäßes Zylindergehäuses für ein Pneumatikzylinder hervor, welches zur Vermeidung der vorstehend geschilderten Problematik einen geschlossenen Kanal zur Unterbringung eines Anbauteils aufweist. Der geschlossene Kanal ist innerhalb der Wandung des Zylindergehäuses ausgebildet. Da das Zylindergehäuse einen im Wesentlichen quadratischen Außenquerschnitt sowie eine kreisrunde Bohrung für den Kolben aufweist, bietet sich der Eckbereich des Zylindergehäuses zur Ausbildung des Kanals an. Dieser wird beim Strangpressen erzeugt, Im geschlossenen Kanal sind Sensoren zur Detektion der Kolbenstellung geschützt untergebracht, welche sich von außen her über einen Permanentmagneten in ihrer relativen Lage zum Zylindergehäuse positionieren lassen.From the EP 1 255 045 B1 goes out a generic cylinder housing for a pneumatic cylinder, which has a closed channel for accommodating an attachment to avoid the above-described problem. The closed channel is formed within the wall of the cylinder housing. Since the cylinder housing has a substantially square outer cross-section and a circular bore for the piston, the corner region of the cylinder housing offers the formation of the channel. This is generated during extrusion, in the closed channel sensors are housed protected for the detection of the piston position, which can be positioned from the outside via a permanent magnet in their relative position to the cylinder housing.

Die Herstellung eines Kanals im Zuge des Strangpressens eignet sich nur für geschlossene Kanäle mit einem recht großen Querschnitt. Soll ein Kanal mit geringem Querschnitt, beispielsweise ein schlitzförmiger Kanal zwischen einer Außenfläche des Zylindergehäuses und der Bohrung hergestellt werden, stößt das bekannte Herstellungsverfahren an seine fertigungstechnischen Grenzen. Stattdessen wird in diesen Fällen auf eine aufwendigere spanende Bearbeitung zurückgegriffen. Eine spanende Bearbeitung ist jedoch höchstens für Kanäle mit kreisrundem Querschnitt effizient, da diese sich bohren lassen.The production of a channel in the course of extrusion is suitable only for closed channels with a fairly large cross-section. If a channel with a small cross-section, for example, a slot-shaped channel between an outer surface of the cylinder housing and the bore are made, the known manufacturing process encounters its production limits. Instead, a more elaborate machining is used in these cases. Machining, however, is efficient only at most for channels of circular cross-section, as they can be drilled.

Aus der DE 102 39 519 A1 geht ein Pneumatikzylinder hervor, bei dem ein die Zylinderbohrung bildendes Innenrohr von einem im Wesentlichen quadratischen Außenrohr umgeben ist. Hierbei entstehen zwischen dem Innenrohr und dem Außenrohr Kanalstrukturen, die zur Unterbringung von Anbauteilen nutzbar sind. Die für die so nutzbaren Kanalstrukturen vorgesehenen Querschnittsbereiche befinden sich hier im Eckbereich des im Wesentlichen quadratischen Außenrohres.From the DE 102 39 519 A1 is a pneumatic cylinder, in which a cylinder bore forming inner tube of a substantially square outer tube is surrounded. In this case arise between the inner tube and the outer tube channel structures that can be used to accommodate attachments. The cross-sectional areas provided for the usable channel structures are here in the corner region of the substantially square outer tube.

Es ist daher die Aufgabe der vorliegenden Erfindung, einen Pneumatikzylinder mit einem Zylindergehäuse aus stranggepresstem Metall zu schaffen, der in fertigungstechnischer einfacher Weise mit einem vorzugsweise schlitzförmigem geschlossenen Kanal ausstattbar ist.It is therefore the object of the present invention to provide a pneumatic cylinder with a cylinder housing made of extruded metal, in production engineering simple manner with a preferably slot-shaped closed channel can be equipped.

Die Aufgabe wird ausgehend von einem Pneumatikzylinder gemäß dem Oberbegriff von Anspruch 1 in Verbindung mit dessen kennzeichnenden Merkmalen gelöst. Die nachfolgenden abhängigen Ansprüche geben vorteilhafte Weiterbildungen der Erfindung wieder.The object is achieved on the basis of a pneumatic cylinder according to the preamble of claim 1 in conjunction with its characterizing features. The following dependent claims give advantageous developments of the invention.

Die Erfindung schließt die technische Lehre ein, dass zur Bildung eines geschlossenen Kanals ein Innenrohr vorgesehen ist, dessen Außenquerschnitt soweit mit dem Innenquerschnitt eines übergeschobenen Außenrohres übereinstimmt, dass sich dazwischen der geschlossene Kanal ergibt.The invention includes the technical teaching that an inner tube is provided to form a closed channel whose outer cross-section matches as far as the inner cross-section of a pushed-over outer tube that results in the closed channel therebetween.

Der Vorteil der erfindungsgemäßen Lösung liegt insbesondere darin, dass eine spanende Fertigung geschlossener Kanäle mit schwierigen Geometrien entbehrlich wird. Beliebige Querschnitte geschlossener Kanäle lassen sich in einfacherweise durch Ineinanderschieben zweier stranggepresste Metallrohre bilden. In diesem Zusammenhang sei darauf hingewiesen, dass nicht zwangsläufig Innenrohr und Außenrohr aus stranggepresstem Metall bestehen müssen.The advantage of the solution according to the invention is, in particular, that a machining of closed channels with difficult geometries is unnecessary. Any cross sections of closed channels can be easily formed by telescoping two extruded metal tubes. In this context, it should be noted that the inner tube and outer tube do not necessarily consist of extruded metal.

Zumindest eines der Rohre kann auch aus Kunststoff oder dergleichen hergestellt werden, soweit die Festigkeit gegeben erscheint. Dies ist insbesondere dann der Fall, wenn das Außenrohr aus Kunststoff besteht. Handelt es sich hierbei um einen transparenten Kunststoff, so lässt sich die Position des im geschlossenen Kanal untergebrachten Anbauteils von außen her leicht erkennen.At least one of the tubes can also be made of plastic or the like, as far as the strength appears given. This is especially the case when the outer tube is made of plastic. If this is a transparent plastic, then the position of the mounted in the closed channel attachment can be easily seen from the outside.

Vorzugsweise ist das Anbauteil als ein elektrischer Sensor zur Detektion der Kolbenstellung ausgebildet. Der erfindungsgemäß geschlossene Kanal kann dabei einen oder mehrere derartige Sensoren aufnehmen.Preferably, the attachment is designed as an electrical sensor for detecting the piston position. The channel closed according to the invention can receive one or more such sensors.

Vorzugsweise ist der elektrische Sensor nach Art eines Foliensensors ausgebildet. Ein Foliensensor besitzt zwei einander gegenüberliegende und von einem Dielektrikum getrennte Kontaktbahnen auf, welche bei Einwirkung eines magnetischen Feldes, hier eines im Kolben integrierten Permanentmagneten, miteinander in Kontakt kommen, so dass sich über eine äußere Widerstandsmessung die Position des Kolbens bestimmen lässt.Preferably, the electrical sensor is designed in the manner of a film sensor. A film sensor has two contact paths lying opposite one another and separated by a dielectric, which come into contact with one another upon the action of a magnetic field, here a permanent magnet integrated in the piston, so that the position of the piston can be determined via an external resistance measurement.

Zur Befestigung eines solchen Foliensensors im Kanal des erfindungsgemäßen Zylindergehäuses wird vorgeschlagen, dass das Innenrohr im Bereich des Kanals mit einer geraden Kanalgrnndfläche versehen ist. Hierauf lässt sich der Foliensensor in einfacher Weise aufbringen, vorzugsweise durch Kleben.For fixing such a film sensor in the channel of the cylinder housing according to the invention, it is proposed that the inner tube is provided in the region of the channel with a straight Kanalgrnndfläche. The film sensor can then be applied in a simple manner, preferably by gluing.

Wird der geschlossene Kanal, vorzugsweise zur Unterbringung eines Foliensensors, schlitzartig ausgebildet, so lassen sich bei einem Durchmesser der Bohrung von kleiner als 100mm eine Höhe des Kanals von 0,5 - 10 mm darstellen. Der obere Grenzwert ist von den geometrischen Abmessungen des unterzubringenden Anbauteils bestimmt. Besonderer Vorteil der erfindungsgemäßen Lösung ist, dass sich auch sehr geringe Schlitzbreiten von bis zu 0,5 mm durch die erfindungsgemäße Lösung darstellen lassen, und zwar gleichmäßig entlang der gesamten Länge des Zylindergehäuses. Hierin lassen sich Foliensensoren mit einer Dicke bis zu 0,5 mm sicher unterbringen.If the closed channel, preferably designed to accommodate a film sensor, slit-like, so can be at a diameter of the bore of less than 100mm, a height of the channel of 0.5 - 10 mm. The upper limit is determined by the geometric dimensions of the attachment to be accommodated. A particular advantage of the inventive solution is that even very small slot widths of up to 0.5 mm can be represented by the solution according to the invention, namely evenly along the entire length of the cylinder housing. Here, foil sensors with a thickness of up to 0.5 mm can be safely accommodated.

Gemäß einer weiteren, die Erfindung verbessernden Maßnahme ist vorgesehen, dass der schlitzartige Kanal in der Höhe abgestuft mit flachen Seitenbereichen ausgebildet sein kann. Die kleinste Höhe der flachen Seitenbereiche beträgt bis zu 0,5 mm. Entlang dieser flachen Seitenbereiche lässt sich der Foliensensor entlang seiner Ränder präzise aufnehmen, wobei der Mittelbereich größerer Höhe genügend Freiraum für eine zuverlässige Betätigung des Foliensensors durch den Permanentmagneten am Kolben lässt.According to a further measure improving the invention, it is provided that the slot-like channel can be stepped in height and formed with flat side regions. The smallest height of the flat side areas is up to 0.5 mm. Along these flat side regions, the film sensor can be precisely recorded along its edges, wherein the middle region of greater height leaves sufficient free space for a reliable actuation of the film sensor by the permanent magnet on the piston.

Vorzugsweise sind der Außenquerschnitt des Innenrohres sowie der Innenquerschnitt des Außenrohres bis auf den Bereich des Kanals kreisrund. Diese Kontur lässt sich fertigungstechnisch durch Strangpressen besonders einfach umsetzen und die so gestalteten Bauteile lassen sich auch ohne Schwierigkeiten durch Ineinanderschieben fügen. Vorzugsweise sollte im zusammengeschobenen Zustand eine leichte Presspassung erzielt werden, damit die so miteinander verbundenen Bauteile eindeutig lagebestimmt sind.Preferably, the outer cross section of the inner tube and the inner cross section of the outer tube to the region of the channel are circular. This contour can be particularly easy to implement by extrusion production technology and the components designed in this way can also be inserted without difficulty by telescoping. Preferably, a slight interference fit should be achieved in the collapsed state, so that the components so interconnected are clearly determined location.

Die erfindungsgemäße Lösung zur Ausbildung des geschlossenen Kanals bildet Voraussetzung dafür, dass der Außenquerschnitt des Außenrohres weiterhin eine glatte quadratische Grundform besitzen kann. Im Eckbereich der quadratischen Grundform verbleibt genügend Material, um hierin Bohrungen zur Aufnahme von Zugankern oder Schrauben einzubringen. Die Zuganker oder Schrauben dienen der Befestigung von Zylinderboden und Zylinderdeckel und sind insoweit ebenfalls geschützt innerhalb der Außenkontur des Zylinderrohres untergebracht.The inventive solution for forming the closed channel is a prerequisite for the outer cross section of the outer tube may continue to have a smooth square basic shape. In the corner region of the square basic form, sufficient material remains to introduce holes for receiving tie rods or screws. The tie rods or screws are used to attach the cylinder base and cylinder cover and are so far also protected within the outer contour of the cylinder tube housed.

Die im Innenzylinder des erfindungsgemäßen Zylindergehäuses eingebrachte Bohrung zur Aufnahme des Kolbens kann kreisrund oder auch polygon ausgeführt sein. Eine polygone Bohrung oder eine vergleichbare nicht-runde Geometrie dient dem Verdrehschutz des hierin verschiebbaren Kolbens.The introduced in the inner cylinder of the cylinder housing according to the invention bore for receiving the piston can be made circular or polygonal. A polygonal bore or comparable non-round geometry serves to prevent rotation of the piston displaceable herein.

Weitere, die Erfindung verbessernden Maßnahmen werden nachstehend gemeinsam mit der Beschreibung eines bevorzugten Ausführungsbeispiels der Erfindung anhand der Figuren näher dargestellt. Es zeigt:

Fig. 1
eine perspektivische Darstellung eines Zylindergehäuses für einen Pneumatikzylinder,
Fig.2
eine Vorderansicht des Zylindergehäuses nach Fig.1, und
Fig.3
ein Detail X aus Fig.2 zur Veranschaulichung des geschlossenen Kanals.
Further measures improving the invention will be described in more detail below together with the description of a preferred embodiment of the invention with reference to FIGS. It shows:
Fig. 1
a perspective view of a cylinder housing for a pneumatic cylinder,
Fig.2
a front view of the cylinder housing after Fig.1 , and
Figure 3
a detail X out Fig.2 to illustrate the closed channel.

Gemäß Fig. 1 besteht das hier dargestellte Zylindergehäuse 1 aus einem Innenrohr 2 sowie einem Außenrohr 3, welche beide aus stranggepresstem Aluminium hergestellt sind. Das Innenrohr 2 weist eine Bohrung 4 zur Aufnahme eines - nicht weiter dargestellten - Kolbens auf. Das Außenrohr 3 besitzt dagegen eine quadratische Grundform mit abgerundeten Kanten. Der Außenquerschnitt des Innenrohres 2 sowie der Innenquerschnitt des Außenrohres 3 sind bis auf den Bereich eines Kanals 5 kreisrund. Das Innenrohr 2 ist im Bereich des Kanals 5 mit einer geraden Kanalgrundfläche 6 versehen. Die Kanalgrundfläche 6 dient zur Aufbringung - nicht weiter dargestellten - Foliensensors zur Detektion der Kolbenstellung.According to Fig. 1 the cylinder housing 1 shown here consists of an inner tube 2 and an outer tube 3, both of which are made of extruded aluminum. The inner tube 2 has a bore 4 for receiving a - not shown - piston. The outer tube 3, however, has a square basic shape with rounded edges. The outer cross section of the inner tube 2 and the inner cross section of the outer tube 3 are circular except for the region of a channel 5. The inner tube 2 is provided in the region of the channel 5 with a straight channel base surface 6. The channel base 6 is used for applying - not shown - film sensor for detecting the piston position.

Gemäß Fig.2 ist der Kanal 5 zwischen Innenraum 2 und Außenrohr 3 geschlossen und schlitzartig ausgebildet. Der Kanal 5 wird durch Einschieben des Innenrohres 2 in das Außenrohr 3 über entsprechende Differenzen in den Querschnitten gebildet. Die Bohrung 4 des Innenzylinders 2 weist zum Verdrehschutz einen polygonen Querschnitt auf. Im Eckbereich der quadratischen Grundform des Außenrohres 3 sind vier Bohrungen 7 zur Aufnahme von - nicht weiter dargestellten - Zugankern eingebracht.According to Fig.2 the channel 5 between the interior 2 and outer tube 3 is closed and formed like a slot. The channel 5 is formed by inserting the inner tube 2 in the outer tube 3 via corresponding differences in the cross sections. The bore 4 of the inner cylinder 2 has a polygonal cross-section to prevent rotation. In the corner of the square basic shape of the outer tube 3 four holes 7 for receiving - not shown - tie rods are introduced.

Gemäß Fig.3 ist im Detail X ersichtlich, dass der schlitzartige Kanal 5 in der Höhe abgestuft mit flachen Seitenbereichen 8 ausgebildet ist, wobei die beidseitigen flachen Seitenbereiche 8 in diesem Ausführungsbeispiel eine Höhe von 0,5 mm besitzen, um einen 0,4 mm breiten Foliensensor randseitig durch Einschieben aufzunehmen und hierin definiert zu fixieren.According to Figure 3 it can be seen in detail X that the slot-like channel 5 is stepped in height with flat side portions 8, wherein the two-sided flat side portions 8 have in this embodiment, a height of 0.5 mm to a 0.4 mm wide film sensor edge through Insertion and fix defined herein.

Die Erfindung ist nicht beschränkt auf das vorstehend beschriebene bevorzugte Ausführungsbeispiel. Es sind vielmehr auch Abwandlungen hiervon denkbar, welche mit vom Schutzbereich der nachfolgenden Ansprüche umfasst. So ist es beispielsweise auch möglich, das Außenrohr des Zylindergehäuses aus einem transparenten Kunststoff auszuführen, um die aktuelle Stellung des innerhalb des geschlossenen Kanals untergebrachten Sensors von außen her erkennbar zu machen. Ferner ist es auch möglich, mehr als nur einen geschlossenen Kanal durch die erfindungsgemäßen Maßnahmen innerhalb der Wandung des zweischaligen Zylindergehäuses unterzubringen.The invention is not limited to the preferred embodiment described above. On the contrary, modifications are conceivable which include the scope of the following claims. For example, it is also possible to make the outer tube of the cylinder housing made of a transparent plastic in order to make the current position of the sensor accommodated within the closed channel recognizable from the outside. Furthermore, it is also possible to accommodate more than just a closed channel by the inventive measures within the wall of the clam shell cylinder housing.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Zylindergehäusecylinder housing
22
Innenrohrinner tube
33
Außenrohrouter tube
44
Bohrungdrilling
55
Kanalchannel
66
KanalgrundflächeChannel base surface
77
Bohrungdrilling
88th
Seitenbereichpage range

Claims (8)

  1. A pneumatic cylinder with a cylinder housing (1), which comprises a central bore (4) for receiving a piston, wherein at least one closed channel (5) is provided in the cylinder wall to accommodate an attachment, wherein an inner tube (2) is provided to form the closed channel (5), the outer cross-section of the inner tube (2) and the inner cross-section of an outer tube (3) slipped over it conforming with each other to such an extent that a closed channel (5) is created between them, characterised in that the inner tube (2) is provided with a flat channel base surface (6) in the area of the channel (5), the base surface (6) being provided for the application of a foil sensor.
  2. The pneumatic cylinder according to claim 1,
    characterised in that the attachment is formed as an electric sensor for detecting the piston position.
  3. The pneumatic cylinder according to claim 1,
    characterised in that the channel (5) is formed as a slot and has a height of 0.5 to 10 mm with a diameter of the bore (4) of less than 100 mm.
  4. The pneumatic cylinder according to claim 3,
    characterised in that the slot-like channel (5) is formed with a stepped height with shallow side areas (8), wherein the smallest height in the shallow side area (8) is up to 0.5 mm.
  5. The pneumatic cylinder according to claim 1,
    characterised in that the bore (4) of the inner cylinder (2) has a polygonal configuration to protect the piston against rotation.
  6. The pneumatic cylinder according to claim 1,
    characterised in that the outer cross-section of the inner tube (2) and the inner cross-section of the outer tube (3) are circular apart from the area of the channel (5).
  7. The pneumatic cylinder according to claim 1,
    characterised in that the outer cross-section of the outer tube (3) has a square basic shape.
  8. The pneumatic cylinder according to claim 7,
    characterised in that bores (7) are provided in the corner areas of the square basic shape of the outer tube (3) to accommodate tension rods.
EP20080158275 2007-06-26 2008-06-13 Pneumatic cylinder with a cylinder casing made from extruded metal Not-in-force EP2009292B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200710029628 DE102007029628B3 (en) 2007-06-26 2007-06-26 Pneumatic cylinder with a cylinder housing made of extruded metal

Publications (3)

Publication Number Publication Date
EP2009292A2 EP2009292A2 (en) 2008-12-31
EP2009292A3 EP2009292A3 (en) 2011-06-01
EP2009292B1 true EP2009292B1 (en) 2012-10-17

Family

ID=39772909

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20080158275 Not-in-force EP2009292B1 (en) 2007-06-26 2008-06-13 Pneumatic cylinder with a cylinder casing made from extruded metal

Country Status (2)

Country Link
EP (1) EP2009292B1 (en)
DE (1) DE102007029628B3 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009014815A1 (en) 2009-03-25 2010-09-30 Festo Ag & Co. Kg Housing tube and thus equipped linear drive
CA2950442C (en) 2014-06-19 2019-04-30 Brandon KENNINGTON Fitness machine
DE102014226830B4 (en) * 2014-12-22 2016-11-24 Multivac Sepp Haggenmüller Se & Co. Kg Packaging machine with hygienic pneumatic cylinder
US10709924B2 (en) 2015-06-19 2020-07-14 Flexline Fitness, Inc. Squat bar for fitness machine
US11097148B2 (en) 2017-07-13 2021-08-24 Flexline Fitness, Inc. Fitness machine

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3529351A1 (en) * 1985-08-16 1987-02-19 Knorr Bremse Ag PRESSURIZABLE CYLINDER
DE4429567C2 (en) * 1994-08-19 1997-04-24 Anton Mueller Method and device for the pressure-tight connection of the cylinder base and a cylinder jacket made of a profile for a pneumatic cylinder
DE10152178C2 (en) * 2001-04-30 2003-04-17 Rexroth Mecman Gmbh Pressure cylinder with a displaceable sensor for the detection of the piston position
EP1255045B1 (en) * 2001-04-30 2005-08-24 Rexroth Mecman GmbH Fluid pressure cylinder with a slidable sensor for detecting the piston position
JP3780187B2 (en) * 2001-08-31 2006-05-31 Ｓｍｃ株式会社 Cylinder tube for fluid pressure cylinder
DE10203791B4 (en) * 2002-01-31 2006-11-30 Rexroth Mecman Gmbh Fluidic working unit with integrated control electronics
DE10210636C1 (en) * 2002-03-11 2003-05-22 Imi Norgren Gmbh Pneumatic or hydraulic working cylinder has piston position sensor adjusted along longitudinal channel at side of cylinder bore

Also Published As

Publication number Publication date
DE102007029628B3 (en) 2009-01-15
EP2009292A2 (en) 2008-12-31
EP2009292A3 (en) 2011-06-01

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