EP0260344B1 - Pressure fluid cylinder - Google Patents

Pressure fluid cylinder Download PDF

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Publication number
EP0260344B1
EP0260344B1 EP86115369A EP86115369A EP0260344B1 EP 0260344 B1 EP0260344 B1 EP 0260344B1 EP 86115369 A EP86115369 A EP 86115369A EP 86115369 A EP86115369 A EP 86115369A EP 0260344 B1 EP0260344 B1 EP 0260344B1
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EP
European Patent Office
Prior art keywords
strip
sealing
pressure medium
longitudinal slot
cylinder according
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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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EP86115369A
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German (de)
French (fr)
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EP0260344A3 (en
EP0260344A2 (en
Inventor
Reinhard Lipinski
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Norgren Martonair Europa GmbH
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Norgren Martonair Europa GmbH
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Priority to AT86115369T priority Critical patent/ATE54015T1/en
Publication of EP0260344A2 publication Critical patent/EP0260344A2/en
Publication of EP0260344A3 publication Critical patent/EP0260344A3/en
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Publication of EP0260344B1 publication Critical patent/EP0260344B1/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
    • F15B15/082—Characterised by the construction of the motor unit the motor being of the slotted cylinder type

Definitions

  • the invention relates to a pressure medium cylinder with an end-closed, longitudinally slotted cylinder tube, in which a sealed piston is guided so as to be longitudinally displaceable, according to the features of the preamble of patent claim 1.
  • the sealing tape and the cover tape are each designed in the form of flexible plastic profile tapes, the connecting elements of which are formed from a longitudinal web formed on one tape and from a longitudinal groove formed on the other tape exist, which is set up for receiving the web.
  • the maximum value of the pressure of the pressure medium with which the interior of the cylinder tube can be acted on is limited. This is due to the fact that when a certain maximum pressure is exceeded, there is a risk that the elastic plastic sealing tape will be pressed by the pressure medium into the longitudinal slot under plastic deformation and thus lose its sealing function.
  • the known pressure cylinder can therefore only be used in a lower pressure range, as is typical for pneumatic cylinders.
  • a similar pressure medium cylinder with a longitudinally slotted cylinder tube is known from US Pat. No. 4,373,427, in which the longitudinal slot is likewise sealed off on both sides of the force transmission element by a sealing tape running on the inside of the cylinder tube and a cover tape arranged on the outside of the cylinder tube.
  • the sealing tape and the masking tape are each constructed in two layers; on one side of a thin ferritic steel strip, a plastic or rubber strip of greater thickness made of an elastically deformable material is applied.
  • Both the sealing tape and the cover tape each have an essentially trapezoidal cross-sectional shape, while in the wall of the cylinder tube, on both sides of the longitudinal slot, correspondingly inclined inclined surfaces are formed as sealing surfaces with which the elastomeric material layer of the respective tape cooperates in a sealing manner.
  • permanent magnets are arranged in the region of the side edge of the longitudinal slot in the cylinder tube wall, the magnetic lines of force of which can close via the ferritic steel tape of both the sealing and the cover end and thus exert a magnetic tensile force on these tapes .
  • the sealing effect which can be achieved by the elastomeric part of the two-layer sealing tape is limited by the fact that the internal metal tape comes to rest on the oblique sealing surfaces and thus prevents further pressing of the elastomeric part against the sealing surfaces.
  • the cylinder tube must be designed to be relatively tight tolerant in the area of its sealing surfaces and in the dimensions of the longitudinal slot, which is expensive and complex.
  • the object of the invention is to provide a pressure medium cylinder with a longitudinally slotted cylinder tube which, with a perfect seal of the longitudinal slot, is suitable for higher pressures of the pressure medium acting on it, without the production, which makes the manufacturing tolerances of the sealing or masking tape or the cylinder tube, very expensive, being very expensive , in particular in the area of the longitudinal slot.
  • stiffening band is separated from the piston by the elastic sealing band or parts thereof, flattening or similar measures on the piston or the piston seals are unnecessary because the elastic sealing band on the side facing the piston maintains its curvature following the cylindrical inner wall of the cylinder barrel can.
  • the stiffening tape prevents the sealing tape from being pressed into the longitudinal slot, even under high pressure. Since the contact surfaces, starting from the longitudinal slit, have an undercut that ensures a certain radial mobility of the parts of the stiffening band lying above these intersections under the action of the pressure medium, a bulging of the stiffening band into the longitudinal slot is counteracted under the action of the pressure medium.
  • the pressure medium cylinder can thus take up relatively high pressures of up to approximately 60 bar and more, as are customary, for example, in low-pressure hydraulics.
  • the sealing surfaces and the contact surfaces of the stiffening band are spatially separated from one another, with the result that the sealing function of the sealing band in the region of the sealing surfaces cannot be impaired by the stiffening band.
  • both the sealing and the cover tape can be designed with a low overall height, ie flat, with simple profile shapes ensuring cost-effective production. Because of the mentioned separation of the sealing and support surfaces, relatively large manufacturing tolerances can also be accepted without fear of impairing the sealing function.
  • stiffening band engages over the two contact surfaces over a contact width that is greater than or equal to the width of the longitudinal slot. This measure helps to prevent the sealing tape from bulging together with the stiffening tape under the action of the pressure medium at high pressures into the longitudinal slot, which may lead to the elastic sealing tape lifting off the sealing surfaces and thus to impairing the seal could.
  • the stiffening band can be arranged directly on the upper side of the sealing band facing away from the piston, in such a way that it comes to rest directly on the bearing surfaces of the cylinder tube.
  • the stiffening band is supported against the bearing surfaces via intermediate parts of the sealing band, so that there is elastic support for the stiffening band and thus an even greater width of the permissible manufacturing tolerances.
  • the stiffening tape can be embedded in the sealing tape for at least part of its width.
  • Simple manufacturing conditions for the cylinder tube and the sealing tape result if the essentially flat bearing surfaces are arranged at an acute angle to the longitudinal center plane of the cylinder tube containing the cylinder tube axis.
  • the stiffening band has, at least on its side facing the longitudinal slot, an essentially flat surface which is at least approximately at right angles to the longitudinal center plane of the longitudinal slot.
  • the sealing tape and / or the stiffening tape in the area of the longitudinal slot are radially guided by guide surfaces formed in the wall of the cylinder tube is limited laterally guided.
  • the radial mobility is necessary in order to be able to lift the sealing tape from the longitudinal slot in the area of the force transmission element of the piston. The mobility is limited by the fact that the stiffening band comes to rest on the contact surfaces in the manner already mentioned.
  • the cover tape or the sealing tape can have at least one web running in the longitudinal direction of the cylinder, projecting into the longitudinal slot and profiled in cross-section, and the sealing tape or the cover tape can have two flanges delimiting a longitudinal groove, between which the web is elastically stable.
  • the thin stiffening tape itself can consist of any material having the required strength properties and the necessary flexibility, such as a suitable plastic material. It would also be conceivable to form the stiffening tape by means of an integrated zone of increased stiffness and strength of the sealing tape which is elastomeric or substantially more flexible outside this zone.
  • the thin stiffening band can also consist of steel because steel, in particular spring steel, has particularly favorable properties for this purpose.
  • the arrangement can be made such that as a connecting element on the cover band there is arranged in the longitudinal direction of the cylinder, at least in places permanent magnetic holding band, which projects into the longitudinal slot and whose magnetic closing circuit extends over the stiffening band.
  • the sealing tape is thus held on the cover tape by magnetic forces, but no additional measures are required on the cylinder tube itself. Since the closing circles of the magnetic lines of force run exclusively within the longitudinal slot, the cylinder tube can also be made from any material, and thus also ferritic steel, etc.
  • the magnetic retaining band can either consist, for example, of a finely divided flexible plastic material containing permanent magnetic particles, as is customary in a strip-like configuration, for example as a door seal for refrigerators and the like, or it can consist of a flexible plastic material strip in which permanent magnetic parts are inserted at intervals.
  • the surface of the holding tape facing the stiffening tape can run at a distance from the stiffening tape with an effective sealing and masking tape, forming an air gap, the air gap compensating for any manufacturing tolerances.
  • the masking tape can be supported on the outer wall of the cylinder tube or on the bottom of a longitudinal recess arranged in this outside of the longitudinal slot at a lateral distance from the edge of the longitudinal slot, with unsupported areas between the support points and the longitudinal slot edge of the masking tape.
  • This design gives the masking tape the possibility of springing back somewhat with the sealing tape when the connecting elements become effective, and thus to compensate for existing manufacturing and dimensional tolerances. Acting in the same direction, if the masking tape in the unsupported areas has a shape design which influences its suspension properties - for example in the form of ribs, weakening zones, etc.
  • sealing tape has profiled sealing lips projecting laterally from the stiffening tape, which cooperate with the sealing surfaces and thus ensure a particularly effective seal.
  • the pressure medium cylinder shown schematically in Fig. 1 which can be used depending on the intended use as a pneumatic or low-hydraulic cylinder, has a cylinder tube 1, for example made of aluminum, which is sealed at both ends by two end flanges 2 attached and in the cylindrical one Interior 3, a cylindrical piston 4 is guided in a longitudinally displaceable manner.
  • the cylinder tube 1 is formed with a longitudinal slot 5 that is continuous over its length and through which a web-like force transmission element 6 rigidly connected to the piston 4 projects outwards, which for connection to a not shown, of him driven machine element is set up.
  • the longitudinal slot 5 is sealed on both sides of the force transmission element 6 by a flexible sealing tape 7 which is arranged in the interior of the cylinder tube 3 and is anchored at both ends in the end flanges 2.
  • the sealing tape 7 is passed through a corresponding opening 8 in the piston area under the force transmission element 6 and held on both sides of the piston 4 with molded sealing lips 9 in contact with sealing surfaces 10.
  • the sealing surfaces 10 are arranged on both sides of the longitudinal slot 5; they are essentially flat and form an obtuse angle of approximately 120 ° with one another.
  • a likewise flexible cover band 11 for the longitudinal slot 5 is arranged on the outside of the cylinder tube, which is anchored at both ends in the end flanges 2 and is guided over or through the force transmission element 6 in the region of the force transmission element 6.
  • the masking tape 11, like the sealing tape 7, consists of a suitable plastic material.
  • the sealing tape 7 is held on both sides of the piston 4 by the cover tape 11 by means of cooperating through the longitudinal slot 5 and extending over the tape length releasable connecting elements with its sealing lips 9 on the sealing surfaces 10 in sealing contact.
  • These connecting elements to be explained in detail with reference to FIGS. 2-5 in various embodiments are fundamentally such that, depending on the longitudinal movement of the piston 4, they are continuously detached from one another and in front of that side of the piston which faces the shrinking cylinder space the other side of the piston are brought into engagement with one another, as is explained in detail, for example, in DE-A 3 124 878.
  • the sealing tape 7 each has a flat, thin stiffening tape 13 of higher strength and of essentially rectangular cross-sectional shape, which extends over the entire length of the sealing tape.
  • the stiffening tape 13 is connected to the relatively soft, elastically deformable plastic or rubber material of the sealing tape 7, for example by gluing or vulcanizing, but embodiments are also conceivable (FIG. 2), in which it is made entirely of the material of the sealing tape 7 or is partially encased without own connecting means between the two bands.
  • the stiffening tape 13 is an integral part of the sealing tape 7, such that, for example, the shaded area in the cross-sectional views according to FIGS. 2-5, the sealing tape 13 a zone with a higher strength and the stiffening tape 13 corresponding represents lower deformability.
  • the thin stiffening tape 13 which in the embodiment according to FIG. 2 optionally consists of a plastic material or steel, is arranged in all embodiments on the side of the sealing tape 7 facing away from the piston 4, so that it is directed towards the piston 4 in this area Corresponding to the cylindrical inner wall of the cylinder tube 1 curved sealing tape 7 is covered. Support surfaces 14 are arranged on both sides of the longitudinal slot 5, which enclose an acute angle with the longitudinal center plane 15 of the longitudinal slot 5 containing the cylinder tube axis. This results, starting from the longitudinal slot 5, with 16 undercuts, the meaning of which will be explained in detail below.
  • Extending between the contact surfaces 14 and the sealing surfaces 10 are essentially parallel guide surfaces 17, which ensure lateral guidance of the sealing tape 7 with respect to the longitudinal slot 5 and at the same time allow the sealing tape 7 - and thus the stiffening tape 13 - to move radially outwards is limited that the stiffening band 13 is supported on the bearing surfaces 14.
  • the reinforcement is tion band 13 in any case so wide that it overlaps the bearing surfaces 14 on both sides of the longitudinal slot 5.
  • the stiffening tape 13 can either be embedded in the sealing tape 7 in the manner shown in FIGS. 2, 4 and 5, at least over part of its width, or, as illustrated in FIG. 3, can be attached to the sealing tape 7 on top so that it is supported against the bearing surfaces 14 either via intermediate parts 18 of the sealing tape 7 or directly via its essentially flat, exposed upper surface 19 (FIG. 3), which runs at least approximately at right angles to the longitudinal center plane 15.
  • the stiffening band 13 thus crosses the longitudinal slot 5 and, via its support on the bearing surfaces 14, holds the sealing tape 7 in the area of the longitudinal slot 5, so that even with high pressure medium pressure prevailing in the cylinder tube interior 3, the sealing tape 7, which is relatively easily deformable with regard to the sealing effect cannot be pressed into the longitudinal slot 5.
  • the arrangement in the embodiment according to FIG. 3 is such that the stiffening tape 13 supports the bearing surfaces 14 over a Support width overlaps that is greater than the width of the longitudinal slot 5.
  • the pressure applied across the width of the support surfaces 14 tends to push up the corresponding areas of the stiffening band 13, which are freely movable by the undercuts 16, with reference to FIG. 3. which counteracts the deformation of the stiffening strip 13 which takes place in the region of the longitudinal slot 5 and which is also directed upwards.
  • the stiffening band 13 remains essentially flat in the region of the longitudinal slot 5 or is even curved somewhat convexly towards the interior of the cylinder tube 3.
  • the connecting elements between the sealing tape and the cover tape 11 are formed in the embodiment according to FIG. 2 by a longitudinally extending web 22, which is profiled in cross section and formed on the cover tape 11 symmetrically to the longitudinal center plane, and cooperating with this, provided on the sealing tape 7, provided longitudinal flanges 23.
  • the two flanges 23 are arranged at a distance from one another and clearly delimit a longitudinal groove 24 into which the web 22 engages. They are formed, moreover, by the edge areas of the sealing tape parts 18 which partially overlap the reinforcing tape 13 in the direction towards the longitudinal slot 5 and between which an exposed central area is present on the bottom of the groove 24.
  • a depression 25 is formed on the outside of the cylinder tube, which receives the cover strip 11.
  • the arrangement is such that the cover band 11 is supported on the bottom of the recesses 25 at a lateral distance from the edge of the longitudinal slot 5 via molded support beads 26, which could also be divided in the longitudinal direction with the formation of discrete support elements.
  • the sealing tape 7 is held magnetically on the cover tape 11.
  • the stiffening band 13 consists of a thin ferritic steel band, while on the cover band 11 there is arranged at least a permanent magnetic holding band 28 running in the longitudinal direction of the cylinder, which projects into the longitudinal slot 5 and whose magnetic closing circuit runs over the ferromagnetic stiffening band 13.
  • the magnetic holding band 28 can alternately have magnetic poles of opposite polarity on the side facing the stiffening band 13, but it can also consist of a flexible plastic material in which finely divided permanent magnetic particles are embedded, as is known for elastic door sealing strips for refrigerators etc.
  • the dimensions of the interacting elements are selected such that when the sealing tape 7 is in contact with the cylinder tube wall, the stiffening tape 13 rests directly against the surface of the magnetic holding tape 28 facing it, essentially without an air gap.
  • the depressions 25 are each formed with a longitudinal shoulder 29, on which the cover band 11 rests in strips near the edges on both sides, so that the unsupported region 27 then results on both sides.
  • molded support beads 26 or similar elements could naturally also be used, as shown in FIG. 5.
  • the arrangement is such that an air gap 30 is formed in the sealing state between the ferromagnetic stiffening band 13 and the surface of the holding band 28 facing it.
  • This Air gap 30 permits an even greater tolerance compensation in the radial direction between the sealing tape 7 and the holding tape 11.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Earth Drilling (AREA)
  • Pens And Brushes (AREA)
  • Gripping On Spindles (AREA)
  • Steering Control In Accordance With Driving Conditions (AREA)

Abstract

In a pressure cylinder (1) having an elongated axially slit cylinder structure closed at the ends in which a piston (4) is guided longitudinally slideable which carries a force transfer element (6) extending through an elongated axial slit (5), the elongated axial slit (5) of the cylinder structure is sealed in the longitudinal direction of the cylinder by a flexible sealing strip (7) disposed on the inside of the cylinder structure and held against a sealing surface (10) of the inside of the cylinder structure. To adapt the pressure cylinder (1) to a higher inner pressure the arrangement is such that the elastically deformable sealing strip (7) has a stiffening strip (13) of greater strength which is connected with it and disposed in the inside of the cylinder structure and which is covered in the direction of the piston (4) by the sealing strip (7). On the cylinder structure on both sides of the elongated axial slit (7) and following the sealing surfaces (10) engagement surfaces (14) are disposed, against which the stiffening strip (14) can be supported.

Description

Die Erfindung betrifft einen Druckmittelzylinder mit einem endseitig verschlossenen, längsgeschlitzten Zylinderrohr, in dem ein abgedichteter Kolben längsverschieblich geführt ist, gemäß den Merkmalen des Oberbegriffs des Patentanspruchs 1.The invention relates to a pressure medium cylinder with an end-closed, longitudinally slotted cylinder tube, in which a sealed piston is guided so as to be longitudinally displaceable, according to the features of the preamble of patent claim 1.

Bei einem aus der DE-A 3 124 915 bekannten Druckmittelzylinder mit diesen Merkmalen sind das Dichtband und das Abdeckband jeweils in Gestalt biegsamer Kunststoff-Profilbänder ausgebildet, deren Verbindungselemente aus einem an dem einen Band angeformten längsverlaufenden Steg und aus einer an dem anderen Band ausgebildeten Längsnut bestehen, welche zur Aufnahme des Steges eingerichtet ist. Dadurch wird zwar eine einwandfreie Abdichtung des Längsschlitzes beidseitig des Kraftübertragungselementes erzielt, doch ist der Maximalwert des Druckes des Druckmittels, mit dem der Zylinderrohrinnenraum beaufschlagt werden kann, begrenzt. Dies rührt daher, daß bei Überschreiten eines bestimmten Maximaldruckes die Gefahr besteht, daß das elastische Kunststoff-Dichtband unter plastischer Verformung von dem Druckmittel in den Längsschlitz hineingedrückt wird und damit seine Dichtungsfunktion verliert. Der bekannte Druckmittelzylinder ist deshalb nur in einem unteren Druckbereich einsetzbar, wie er für Pneumatikzylinder typisch ist.In a pressure medium cylinder known from DE-A 3 124 915 with these features, the sealing tape and the cover tape are each designed in the form of flexible plastic profile tapes, the connecting elements of which are formed from a longitudinal web formed on one tape and from a longitudinal groove formed on the other tape exist, which is set up for receiving the web. Although this results in a perfect sealing of the longitudinal slot on both sides of the force transmission element, the maximum value of the pressure of the pressure medium with which the interior of the cylinder tube can be acted on is limited. This is due to the fact that when a certain maximum pressure is exceeded, there is a risk that the elastic plastic sealing tape will be pressed by the pressure medium into the longitudinal slot under plastic deformation and thus lose its sealing function. The known pressure cylinder can therefore only be used in a lower pressure range, as is typical for pneumatic cylinders.

Aus der US-A 4 373 427 ist ein ähnlicher Druckmittelzylinder mit längsgeschlitztem Zylinderrohr bekannt, bei dem der Längsschlitz ebenfalls durch ein auf der Zylinderrohrinnenseite verlaufendes Dichtband und ein auf der Zylinderrohraußenseite angeordnetes Abdeckband beidseitig des Kraftübertragungselementes abgedichtet verschlossen ist. Das Dichtband und das Abdeckband ist dabei jeweils zweischichtig aufgebaut; auf ein dünnes ferritisches Stahlband ist auf einer Seite ein aus einem elastisch verformbaren Material bestehendes Kunststoff- oder Kautschukband größerer Dicke aufgebracht. Sowohl das Dichtband als auch das Abdeckband weisen jeweils eine im wesentlichen trapezförmige Querschnittsgestalt auf, während in der Wandung des Zylinderrohres beidseitig des Längsschlitzes entsprechend geneigte Schrägflächen als Dichtflächen ausgebildet sind, mit denen die elastomere Materialschicht des jeweiligen Bandes abdichtend zusammenwirkt. Um insbesondere das Dichtband in dem Längsschlitz zu halten, sind im Bereiche der Seitenberandung des Längsschlitzes in der Zylinderrohrwandung Permanentmagnete angeordnet, deren magnetische Kraftlinien sich über das ferritische Stahlband sowohl des Dicht- als auch des Abdeckendes schließen können und somit auf diese Bänder eine magnetische Zugkraft ausüben.A similar pressure medium cylinder with a longitudinally slotted cylinder tube is known from US Pat. No. 4,373,427, in which the longitudinal slot is likewise sealed off on both sides of the force transmission element by a sealing tape running on the inside of the cylinder tube and a cover tape arranged on the outside of the cylinder tube. The sealing tape and the masking tape are each constructed in two layers; on one side of a thin ferritic steel strip, a plastic or rubber strip of greater thickness made of an elastically deformable material is applied. Both the sealing tape and the cover tape each have an essentially trapezoidal cross-sectional shape, while in the wall of the cylinder tube, on both sides of the longitudinal slot, correspondingly inclined inclined surfaces are formed as sealing surfaces with which the elastomeric material layer of the respective tape cooperates in a sealing manner. In order to hold the sealing tape in the longitudinal slot in particular, permanent magnets are arranged in the region of the side edge of the longitudinal slot in the cylinder tube wall, the magnetic lines of force of which can close via the ferritic steel tape of both the sealing and the cover end and thus exert a magnetic tensile force on these tapes .

Da das flache, ebene Stahlband auf der dem Kolben zugewandten Seite des Dichtbandes freiliegend angeordnet ist, müssen an dem sonst im Querschnitt zylindrischen Kolben und den Kolbendichtungsmanschetten in dem dem Dichtband gegenüberliegenden Bereich Abflachungen vorgesehen werden, die unerwünscht sind und bei den Kolbendichtmanschetten zu Abdichtungsproblemen führen können. Au- βerdem ist die von dem elastomeren Teil des zweischichtigen Dichtbandes erzielbare Dichtwirkung dadurch begrenzt, daß das innenliegende Metallband auf den schrägen Dichtflächen zur Auflage kommt und damit ein weiteres Anpressen des elastomeren Teils an die Dichtflächen verhindert. Um dies zu verhüten, muß das Zylinderrohr im Bereiche seiner Dichtflächen und in den Abmessungen des Längsschlitzes verhältnismäßig engtoleriert ausgebildet werden, was teuer und aufwendig ist.Since the flat, flat steel band is exposed on the side of the sealing band facing the piston, flats must be provided on the piston and the piston sealing sleeves, which are otherwise of cross-section, in the area opposite the sealing band, which are undesirable and can lead to sealing problems with the piston sealing sleeves . In addition, the sealing effect which can be achieved by the elastomeric part of the two-layer sealing tape is limited by the fact that the internal metal tape comes to rest on the oblique sealing surfaces and thus prevents further pressing of the elastomeric part against the sealing surfaces. In order to prevent this, the cylinder tube must be designed to be relatively tight tolerant in the area of its sealing surfaces and in the dimensions of the longitudinal slot, which is expensive and complex.

Außerdem ist es aus der DD-A 236 370 bekannt, bei einem kolbenstangenlosen Zylinder das Dichtband aus einem flexiblen, elastischen Material zu fertigen, in das ein biegsames Stahlband eingebettet bzw. einvulkanisiert ist. Bei höheren Drücken besteht die Gefahr, daß sich das Dichtband in den Längsschlitz hineinwölbt, wodurch die Dichtwirkung beeinträchtigt werden kann.It is also known from DD-A 236 370 to manufacture the sealing tape in a rodless cylinder from a flexible, elastic material in which a flexible steel tape is embedded or vulcanized. At higher pressures there is a risk that the sealing tape bulges into the longitudinal slot, which can impair the sealing effect.

Aufgabe der Erfindung ist es, einen Druckmittelzylinder mit längsgeschlitztem Zylinderrohr zu schaffen, der bei einwandfreier Abdichtung des Längsschlitzes für höhere Drücke des ihn beaufschlagenden Druckmittels geeignet ist, ohne daß dazu die Herstellung wesentlich verteuernde hohe Anforderungen an die Herstellungstoleranzen des Dicht- oder Abdeckbandes oder des Zylinderrohres, insbesondere im Bereiche des Längsschlitzes, bedingt wären.The object of the invention is to provide a pressure medium cylinder with a longitudinally slotted cylinder tube which, with a perfect seal of the longitudinal slot, is suitable for higher pressures of the pressure medium acting on it, without the production, which makes the manufacturing tolerances of the sealing or masking tape or the cylinder tube, very expensive, being very expensive , in particular in the area of the longitudinal slot.

Zur Lösung dieser Aufgabe weist der eingangs genannte Druckmittelzylinder erfindungsgemäß die Merkmale des kennzeichnenden Teiles des Patentanspruchs 1 auf.To achieve this object, the pressure medium cylinder mentioned at the outset has the features of the characterizing part of patent claim 1.

Dadurch, daß das Versteifungsband durch das elastische Dichtband oder Teile desselben von dem Kolben getrennt ist, erübrigen sich Abflachungen oder dergleichen Maßnahmen an dem Kolben oder den Kolbendichtungen, weil das elastische Dichtband auf der dem Kolben zugewandten Seite seine der zylindrischen Innenwand des Zylinderrohres folgende Krümmung beibehalten kann. Das Versteifungsband verhindert auch bei hoher Druckbeaufschlagung ein unzulässiges Eindrücken des Dichtbandes in den Längsschlitz. Da die Auflageflächen, ausgehend von dem Längsschlitz, eine Hinterschneidung aufweisen, die eine gewisse radiale Beweglichkeit der über diesen Verschneidungen liegenden Teile des Versteifungsbandes unter der Druckmitteleinwirkung gewährleistet, wird einem Hineinwölben des Versteifungsbandes in den Längsschlitz unter der Wirkung der Druckmittelbeaufschlagung entgegengewirkt. Damit kann der Druckmittelzylinder verhältnismäßig hohe Drücke bis ca. 60 bar und mehr aufnehmen, wie sie bspw. bei der Niederdruckhydraulik gebräuchlich sind. Schließlich sind die Dichtflächen und die Auflageflächen des Versteifungsbandes räumlich voneinander getrennt, mit dem Ergebnis, daß die Dichtfunktion des Dichtbandes im Bereiche der Dichtflächen durch das Versteifungsband nicht beeinträchtigt werden kann. Im übrigen lassen sich sowohl das Dicht- als auch das Abdeckband mit geringer Bauhöhe, d.h. flach, ausbilden, wobei einfache Profilformen eine kostengünstige Herstellung gewährleisten. Wegen der erwähnten Trennung der Dicht-und Auflageflächen können auch verhältnismäßig große Herstellungstoleranzen in Kauf genommen werden, ohne daß eine Beeinträchtigung der Abdichtfunktion zu befürchten wäre.Because the stiffening band is separated from the piston by the elastic sealing band or parts thereof, flattening or similar measures on the piston or the piston seals are unnecessary because the elastic sealing band on the side facing the piston maintains its curvature following the cylindrical inner wall of the cylinder barrel can. The stiffening tape prevents the sealing tape from being pressed into the longitudinal slot, even under high pressure. Since the contact surfaces, starting from the longitudinal slit, have an undercut that ensures a certain radial mobility of the parts of the stiffening band lying above these intersections under the action of the pressure medium, a bulging of the stiffening band into the longitudinal slot is counteracted under the action of the pressure medium. The pressure medium cylinder can thus take up relatively high pressures of up to approximately 60 bar and more, as are customary, for example, in low-pressure hydraulics. Finally, the sealing surfaces and the contact surfaces of the stiffening band are spatially separated from one another, with the result that the sealing function of the sealing band in the region of the sealing surfaces cannot be impaired by the stiffening band. In addition, both the sealing and the cover tape can be designed with a low overall height, ie flat, with simple profile shapes ensuring cost-effective production. Because of the mentioned separation of the sealing and support surfaces, relatively large manufacturing tolerances can also be accepted without fear of impairing the sealing function.

Vorteilhaft ist es, wenn das Versteifungsband die beiden Auflageflächen über eine Auflagebreite übergreift, die größer oder gleich der Breite des Längsschlitzes ist. Diese Maßnahme trägt dazu bei zu verhindern, daß sich das Dichtband zusammen mit dem Versteifungsband unter der Wirkung des Druckmittels bei hohen Drücken in den Längsschlitz hineinwölben kann, was unter Umständen zu einem Abheben des elastischen Dichtbandes von den Dichtflächen und damit zu einer Beeinträchtigung der Abdichtung führen könnte.It is advantageous if the stiffening band engages over the two contact surfaces over a contact width that is greater than or equal to the width of the longitudinal slot. This measure helps to prevent the sealing tape from bulging together with the stiffening tape under the action of the pressure medium at high pressures into the longitudinal slot, which may lead to the elastic sealing tape lifting off the sealing surfaces and thus to impairing the seal could.

Das Versteifungsband kann unmittelbar auf der dem Kolben abgewandten Oberseite des Dichtbandes freiliegend angeordnet sein, derart, daß es unmittelbar an den Auflageflächen des Zylinderrohres zur Anlage kommt. Es kann aber auch zweckmäßig sein, daß das Versteifungsband gegen die Auflageflächen über dazwischenliegende Teile des Dichtbandes abgestützt ist, so daß sich eine elastische Abstützung des Versteifungsbandes und damit eine noch größere Breite der zulässigen Herstellungstoleranzen ergeben. In der praktischen Ausführung kann das Versteifungsband dazu zumindest über einen Teil seiner Breite in dem Dichtungsband eingebettet sein.The stiffening band can be arranged directly on the upper side of the sealing band facing away from the piston, in such a way that it comes to rest directly on the bearing surfaces of the cylinder tube. However, it can also be expedient that the stiffening band is supported against the bearing surfaces via intermediate parts of the sealing band, so that there is elastic support for the stiffening band and thus an even greater width of the permissible manufacturing tolerances. In the practical embodiment, the stiffening tape can be embedded in the sealing tape for at least part of its width.

Einfache Herstellungsverhältnisse für das Zylinderrohr und das Dichtband ergeben sich, wenn die im wesentlichen ebenen Auflageflächen unter einem spitzen Winkel zu der die Zylinderrohrachse enthaltenden Längsmittelebene des Zylinderrohres verlaufend angeordnet sind.Simple manufacturing conditions for the cylinder tube and the sealing tape result if the essentially flat bearing surfaces are arranged at an acute angle to the longitudinal center plane of the cylinder tube containing the cylinder tube axis.

In einer bevorzugten Ausführungsform weist das Versteifungsband zumindest auf seiner dem Längsschlitz zugewandten Seite eine im wesentlichen ebene Fläche auf, die zumindest näherungsweise rechtwinklig zu der Längsmittelebene des Längsschlitzes verläuft. Um zu verhüten, daß zufolge von Herstellungstoleranzen etc. das Dichtband sich seitlich zu dem Längsschlitz verschiebt und damit die Abdichtung gefährdet wird, ist es zweckmäßig, wenn das Dichtband und/oder das Versteifungsband im Bereiche des Längsschlitzes durch in der Wandung des Zylinderrohres ausgebildete Führungsflächen radial begrenzt beweglich seitlich geführt ist. Die radiale Beweglichkeit ist erforderlich, um das Dichtband im Bereiche des Kraftübertragungselementes des Kolbens von dem Längsschlitz abheben zu können. Die Begrenzung der Beweglichkeit erfolgt dadurch, daß das Versteifungsband in bereits erwähnter Weise auf den Auflageflächen zur Auflage kommt.In a preferred embodiment, the stiffening band has, at least on its side facing the longitudinal slot, an essentially flat surface which is at least approximately at right angles to the longitudinal center plane of the longitudinal slot. In order to prevent that, due to manufacturing tolerances, etc., the sealing tape shifts laterally to the longitudinal slot and thus the seal is endangered, it is expedient if the sealing tape and / or the stiffening tape in the area of the longitudinal slot are radially guided by guide surfaces formed in the wall of the cylinder tube is limited laterally guided. The radial mobility is necessary in order to be able to lift the sealing tape from the longitudinal slot in the area of the force transmission element of the piston. The mobility is limited by the fact that the stiffening band comes to rest on the contact surfaces in the manner already mentioned.

Als Verbindungselemente können das Abdeckband oder das Dichtband wenigstens einen in Zylinderlängsrichtung verlaufenden, in den Längsschlitz ragenden und im Querschnitt profilierten Steg und das Dichtband bzw. das Abdeckband zwei eine Längsnut begrenzende Flansche aufweisen, zwischen denen der Steg elastisch haltbar ist. Dabei ergeben sich sehr einfache Herstellungsverhältnisse, wenn das Versteifungsband von dem Dichtband auf der dem Längsschlitz zugewandten Seite unter Freilassung eines sich in Bandlängsrichtung erstreckenden streifenartigen Mittelbereiches umhüllt ist, wobei die Flanschen durch die gegebenenfalls in Richtung auf den Längsschlitz aufgebogenen oder aufgewölbten Randbereiche des den Mittelbereich begrenzenden Dichtbandmateriales gebildet sind.As connecting elements, the cover tape or the sealing tape can have at least one web running in the longitudinal direction of the cylinder, projecting into the longitudinal slot and profiled in cross-section, and the sealing tape or the cover tape can have two flanges delimiting a longitudinal groove, between which the web is elastically stable. This results in very simple manufacturing conditions if the stiffening tape is encased by the sealing tape on the side facing the longitudinal slot, leaving a strip-like central region extending in the longitudinal direction of the tape, the flanges being delimited by the edge regions of the central region which are optionally bent or arched in the direction of the longitudinal slot Sealing tape material are formed.

Da das Dichtband und das Abdeckband bei diesen Ausführungsformen durch die zusammenwirkenden Verbindungselemente form- oder reibschlüssig mechanisch aneinander gehaltert sind, kann das dünne Versteifungsband an sich aus jedem die geforderten Festigkeitseigenschaften und die notwendige Biegsamkeit aufweisenden Material, etwa einem geeigneten Kunststoffmaterial, bestehen. Es wäre auch denkbar, das Versteifungsband durch eine integrierte Zone erhöhter Steifigkeit und Festigkeit des außerhalb dieser Zone elastomeren oder wesentlich leichter biegsamen Dichtbandes zu bilden. Bei einer anderen Ausführungsform kann das dünne Versteifungsband aber auch aus Stahl bestehen, weil Stahl, insbesondere Federstahl, für diesen Zweck besonders günstige Eigenschaften aufweist. Wenn das dünne Versteifungsband aus ferritischem Stahl besteht, kann die Anordnung derart getroffen werden, daß als Verbindungselement an dem Abdeckband ein in Zylinderlängsrichtung verlaufendes, zumindest stellenweise dauermagnetisches Halteband angeordnet ist, das in den Längsschlitz ragt und dessen magnetischer Schließungskreis über das Versteifungsband verläuft. Damit wird das Dichtband über magnetische Kräfte an dem Abdeckband gehaltert, wobei jedoch an dem Zylinderrohr selbst keinerlei zusätzliche Maßnahmen erforderlich sind. Da die Schließungskreise der magnetischen Kraftlinien ausschließlich innerhalb des Längsschlitzes verlaufen, kann auch das Zylinderrohr aus jedem beliebigen Material, und damit auch ferritischem Stahl etc., hergestellt werden.Since the sealing tape and the masking tape in these embodiments are mechanically or mechanically held together by the cooperating connecting elements, the thin stiffening tape itself can consist of any material having the required strength properties and the necessary flexibility, such as a suitable plastic material. It would also be conceivable to form the stiffening tape by means of an integrated zone of increased stiffness and strength of the sealing tape which is elastomeric or substantially more flexible outside this zone. In another embodiment, the thin stiffening band can also consist of steel because steel, in particular spring steel, has particularly favorable properties for this purpose. If the thin stiffening band is made of ferritic steel, the arrangement can be made such that as a connecting element on the cover band there is arranged in the longitudinal direction of the cylinder, at least in places permanent magnetic holding band, which projects into the longitudinal slot and whose magnetic closing circuit extends over the stiffening band. The sealing tape is thus held on the cover tape by magnetic forces, but no additional measures are required on the cylinder tube itself. Since the closing circles of the magnetic lines of force run exclusively within the longitudinal slot, the cylinder tube can also be made from any material, and thus also ferritic steel, etc.

Das magnetische Halteband kann entweder bspw. aus einem feinverteilte dauermagnetische Partikel enthaltenden biegsamen Kunststoffmaterial, wie es in streifenförmiger Ausbildung etwa als Türdichtung für Kühlschränke und dergleichen gebräuchlich ist, oder aber aus einem biegsamen Kunststoffmaterialstreifen bestehen, in den in Abständen dauermagnetische Teile eingesetzt sind. Dabei kann die dem Versteifungsband zugewandte Fläche des Haltebandes bei wirksamem Dicht- und Abdeckband unter Ausbildung eines Luftspaltes im Abstand zu dem Versteifungsband verlaufen, wobei der Luftspalt etwaige Fertigungstoleranzen ausgleicht.The magnetic retaining band can either consist, for example, of a finely divided flexible plastic material containing permanent magnetic particles, as is customary in a strip-like configuration, for example as a door seal for refrigerators and the like, or it can consist of a flexible plastic material strip in which permanent magnetic parts are inserted at intervals. The surface of the holding tape facing the stiffening tape can run at a distance from the stiffening tape with an effective sealing and masking tape, forming an air gap, the air gap compensating for any manufacturing tolerances.

Um diesen Toleranzausgleich noch wirksamer zu gestalten, kann das Abdeckband auf der Außenwand des Zylinderrohres oder auf dem Boden einer in dieses außen neben dem Längsschlitz angeordneten längsverlaufenden Vertiefung in seitlichem Abstand von der Berandung des Längsschlitzes abgestützt sein, wobei zwischen den Abstützstellen und der Längsschlitzberandung ununterstützte Bereiche des Abdeckbandes liegen. Diese Ausbildung gibt dem Abdeckband die Möglichkeit, beim Wirksamwerden der Verbindungselemente mit dem Dichtband etwas nachzufedern und damit vorhandene Fertigungs- und Abmessungstoleranzen auszugleichen. In der gleichen Richtung wirkend ist es auch, wenn das Abdeckband in den ununterstützten Bereichen eine seine Federungseigenschaften beeinflussende Formgestaltung - bspw. in Gestalt von Rippen Schwächungszonen etc. - aufweist.In order to make this tolerance compensation even more effective, the masking tape can be supported on the outer wall of the cylinder tube or on the bottom of a longitudinal recess arranged in this outside of the longitudinal slot at a lateral distance from the edge of the longitudinal slot, with unsupported areas between the support points and the longitudinal slot edge of the masking tape. This design gives the masking tape the possibility of springing back somewhat with the sealing tape when the connecting elements become effective, and thus to compensate for existing manufacturing and dimensional tolerances. Acting in the same direction, if the masking tape in the unsupported areas has a shape design which influences its suspension properties - for example in the form of ribs, weakening zones, etc.

Schließlich ist es vorteilhaft, wenn das Dichtband anschließend an das Versteifungsband seitlich vorragende profilierte Dichtlippen aufweist, die mit den Dichtflächen zusammenwirken und damit eine besonders wirksame Abdichtung gewährleisten.Finally, it is advantageous if the sealing tape has profiled sealing lips projecting laterally from the stiffening tape, which cooperate with the sealing surfaces and thus ensure a particularly effective seal.

In der Zeichnung sind Ausführungsbeispiele des Gegenstandes der Erfindung dargestellt. Es zeigen:

  • Fig. 1 einen Druckmittelzylinder gemäß der Erfindung, im axialen Schnitt, in einer Seitenansicht und in schematischer Darstellung,
  • Fig. 2 das Zylinderrohr des Druckmittelzylinders nach Fig. 1, im Querschnitt längs der Linie 11-11 der Fig. 1, in perspektivischer Darstellung, im Ausschnitt und in einem anderen Maßstab,
  • Fig. 3 das Zylinderrohr des Druckmittelzylinders nach Fig. 1, in einer Darstellung entsprechend Fig. 2, unter Veranschaulichung einer zweiten Ausführungsform des Dicht- und des Abdeckbandes, und
  • Fig. 4, 5 das Zylinderrohr des Druckmittelzylinders nach Fig. 1, jeweils in einer Darstellung entsprechend Fig. 2, unter Veranschaulichung zweier weiterer abgewandelter Ausführungsformen des Dicht- und des Abdeckbandes.
Exemplary embodiments of the subject matter of the invention are shown in the drawing. Show it:
  • 1 is a pressure medium cylinder according to the invention, in axial section, in a side view and in a schematic representation,
  • 2, the cylinder tube of the pressure medium cylinder according to FIG. 1, in cross section along the line 11-11 of FIG. 1, in a perspective view, in detail and on a different scale,
  • Fig. 3, the cylinder tube of the pressure cylinder according to Fig. 1, in a representation corresponding to Fig. 2, illustrating a second embodiment of the sealing and the cover tape, and
  • 4, 5 the cylinder tube of the pressure medium cylinder according to FIG. 1, each in a representation corresponding to FIG. 2, illustrating two further modified embodiments of the sealing and the cover tape.

Der in Fig. 1 schematisch dargestellte Druckmittelzylinder, der abhängig von dem Verwendungszweck als Pneumatik- oder Nieder-Hydraulikzylinder verwendet werden kann, weist ein bspw. aus Aluminium bestehendes Zylinderrohr 1 auf, das beidenends durch zwei aufgesetzte Endflansche 2 abgedichtet verschlossen ist und in dessen zylindrischem Innenraum 3 ein zylindrischer Kolben 4 längsverschieblich geführt ist. Wie bspw. aus Fig. 2 zu entnehmen, ist das Zylinderrohr 1 mit einem über seine Länge durchgehenden Längsschlitz 5 ausgebildet, durch den ein mit dem Kolben 4 starr verbundenes stegartiges Kraftübertragungselement 6 nach außen ragt, das zum Anschluß an ein nicht weiter dargestelltes, von ihm angetriebenes Maschinenelement eingerichtet ist. In Zylinderrohrlängsrichtung ist der Längsschlitz 5 beidseitig des Kraftübertragungselementes 6 durch ein in dem Zylinderrohrinnenraum 3 angeordnetes, biegsames Dichtband 7 abgedichtet, das an seinen beiden Enden in den Endflanschen 2 verankert ist. Das Dichtband 7 ist durch eine entsprechende Öffnung 8 im Kolbenbereich unter dem Kraftübertragungselement 6 hindurchgeführt und beidseitig des Kolbens 4 mit angeformten Dichtlippen 9 in Anlage an Dichtflächen 10 gehalten. Die Dichtflächen 10 sind beidseitig des Längsschlitzes 5 angeordnet; sie sind im wesentlichen eben und schließen einen stumpfen Winkel von ca. 120° miteinander ein.The pressure medium cylinder shown schematically in Fig. 1, which can be used depending on the intended use as a pneumatic or low-hydraulic cylinder, has a cylinder tube 1, for example made of aluminum, which is sealed at both ends by two end flanges 2 attached and in the cylindrical one Interior 3, a cylindrical piston 4 is guided in a longitudinally displaceable manner. As can be seen, for example, from FIG. 2, the cylinder tube 1 is formed with a longitudinal slot 5 that is continuous over its length and through which a web-like force transmission element 6 rigidly connected to the piston 4 projects outwards, which for connection to a not shown, of him driven machine element is set up. In the longitudinal direction of the cylinder tube, the longitudinal slot 5 is sealed on both sides of the force transmission element 6 by a flexible sealing tape 7 which is arranged in the interior of the cylinder tube 3 and is anchored at both ends in the end flanges 2. The sealing tape 7 is passed through a corresponding opening 8 in the piston area under the force transmission element 6 and held on both sides of the piston 4 with molded sealing lips 9 in contact with sealing surfaces 10. The sealing surfaces 10 are arranged on both sides of the longitudinal slot 5; they are essentially flat and form an obtuse angle of approximately 120 ° with one another.

Auf der Zylinderrohraußenseite ist ein ebenfalls biegsames Abdeckband 11 für den Längsschlitz 5 angeordnet, das an seinen beiden Enden in den Endflanschen 2 verankert und im Bereiche des Kraftübertragungselementes 6 über dieses hinwegoder durch dieses hindurchgeführt ist. Das Abdeckband 11 besteht, ähnlich wie das Dichtband 7, aus einem geeigneten Kunststoffmaterial.A likewise flexible cover band 11 for the longitudinal slot 5 is arranged on the outside of the cylinder tube, which is anchored at both ends in the end flanges 2 and is guided over or through the force transmission element 6 in the region of the force transmission element 6. The masking tape 11, like the sealing tape 7, consists of a suitable plastic material.

Das Dichtband 7 ist beidseitig des Kolbens 4 durch das Abdeckband 11 mittels durch den Längsschlitz 5 zusammenwirkender und sich über die Bandlänge erstreckender lösbarer Verbindungselemente mit seinen Dichtlippen 9 an den Dichtflächen 10 abdichtend in Anlage gehalten. Diese im einzelnen anhand der Fig. 2 - 5 in verschiedenen Ausführungsformen noch zu erläuternden Verbindungselemente sind grundsätzlich derart beschaffen, daß sie in Abhängigkeit von der Längsbewegung des Kolbens 4 jeweils fortlaufend vor derjenigen Kolbenseite, die dem sich verkleinernden Zylinderraum zugewandt ist,voneinander gelöst und auf der jeweils anderen Kolbenseite miteinander in Eingriff gebracht werden, wie dies bspw. in der DE-A 3 124 878 im einzelnen erläutert ist.The sealing tape 7 is held on both sides of the piston 4 by the cover tape 11 by means of cooperating through the longitudinal slot 5 and extending over the tape length releasable connecting elements with its sealing lips 9 on the sealing surfaces 10 in sealing contact. These connecting elements to be explained in detail with reference to FIGS. 2-5 in various embodiments are fundamentally such that, depending on the longitudinal movement of the piston 4, they are continuously detached from one another and in front of that side of the piston which faces the shrinking cylinder space the other side of the piston are brought into engagement with one another, as is explained in detail, for example, in DE-A 3 124 878.

Das Dichtband 7 weist bei den in den Fig. 2 - 5 veranschaulichten verschiedenen Ausführungsformen jeweils ein flaches, dünnes Versteifungsband 13 höherer Festigkeit und von im wesentlichen rechteckiger Querschnittsgestalt auf, das sich über die gesamte Länge des Dichtbandes erstreckt. Das Versteifungsband 13 ist mit dem verhältnismäßig weichen, elastisch verformbaren Kunststoff-oder Kautschukmaterial des Dichtbandes 7, bspw. durch Verkleben oder Vulkanisieren, verbunden, doch sind auch Ausführungsformen denkbar (Fig. 2), bei denen es einfach von dem Material des Dichtbandes 7 ganz oder teilweise umhüllt ist, ohne daß eigene Verbindungsmittel zwischen den beiden Bändern vorhanden wären. Daneben wäre es denkbar, daß das Versteifungsband 13 ein integraler Bestandteil des Dichtbandes 7 ist, derart, daß bspw. der in den Querschnittsdarstellungen nach den Fig. 2 - 5 das Dichtband 13 veranschaulichende schraffierte Bereich eine Zone mit einer dem Versteifungsband 13 entsprechenden höheren Festigkeit und geringeren Verformbarkeit darstellt.In the various embodiments illustrated in FIGS. 2-5, the sealing tape 7 each has a flat, thin stiffening tape 13 of higher strength and of essentially rectangular cross-sectional shape, which extends over the entire length of the sealing tape. The stiffening tape 13 is connected to the relatively soft, elastically deformable plastic or rubber material of the sealing tape 7, for example by gluing or vulcanizing, but embodiments are also conceivable (FIG. 2), in which it is made entirely of the material of the sealing tape 7 or is partially encased without own connecting means between the two bands. In addition, it would be conceivable that the stiffening tape 13 is an integral part of the sealing tape 7, such that, for example, the shaded area in the cross-sectional views according to FIGS. 2-5, the sealing tape 13 a zone with a higher strength and the stiffening tape 13 corresponding represents lower deformability.

Das dünne Versteifungsband 13, das bei der Ausführungsform nach Fig. 2 wahlweise aus einem Kunststoffmaterial oder aus Stahl besteht, ist bei allen Ausführungsformen auf der dem Kolben 4 abgewandten Seite des Dichtbandes 7 angeordnet, so daß es zum Kolben 4 hin durch das in diesem Bereich entsprechend der zylindrischen Innenwand des Zylinderrohres 1 gekrümmte Dichtband 7 abgedeckt ist. Beidseitig des Längsschlitzes 5 sind Auflageflächen 14 angeordnet, die mit der die Zylinderrohrachse enthaltenden Längsmittelebene 15 des Längsschlitzes 5 einen spitzen Winkel einschließen. Dadurch ergeben sich, ausgehend von dem Längsschlitz 5, bei 16 Hinterschneidungen, deren Bedeutung im einzelnen noch erläutert werden wird. Zwischen den Auflageflächen 14 und den Dichtflächen 10 erstrecken sich im wesentlichen parallele Führungsflächen 17, die eine seitliche Führung des Dichtbandes 7 bezüglich des Längsschlitzes 5 gewährleisten und gleichzeitig eine radiale Beweglichkeit des Dichtbandes 7 - und damit des Versteifungsbandes 13 - erlauben, die nach außen zu dadurch begrenzt ist, daß das Versteifungsband 13 auf den Auflageflächen 14 abgestützt wird.The thin stiffening tape 13, which in the embodiment according to FIG. 2 optionally consists of a plastic material or steel, is arranged in all embodiments on the side of the sealing tape 7 facing away from the piston 4, so that it is directed towards the piston 4 in this area Corresponding to the cylindrical inner wall of the cylinder tube 1 curved sealing tape 7 is covered. Support surfaces 14 are arranged on both sides of the longitudinal slot 5, which enclose an acute angle with the longitudinal center plane 15 of the longitudinal slot 5 containing the cylinder tube axis. This results, starting from the longitudinal slot 5, with 16 undercuts, the meaning of which will be explained in detail below. Extending between the contact surfaces 14 and the sealing surfaces 10 are essentially parallel guide surfaces 17, which ensure lateral guidance of the sealing tape 7 with respect to the longitudinal slot 5 and at the same time allow the sealing tape 7 - and thus the stiffening tape 13 - to move radially outwards is limited that the stiffening band 13 is supported on the bearing surfaces 14.

Wie den Fig. 2 - 5 zu entnehmen, ist das Versteifungsband 13 in jedem Falle so breit, daß es die Auflageflächen 14 beidseitig des Längsschlitzes 5 übergreift. Dabei kann das Versteifungsband 13 entweder in der aus den Fig. 2,4 und 5 ersichtlichen Weise zumindest über einen Teil seiner Breite in dem Dichtungsband 7 eingebettet oder, wie in Fig. 3 veranschaulicht, auf dem Dichtband 7 obenaufliegend befestigt sein, so daß es gegen die Auflageflächen 14 entweder über dazwischenliegende Teile 18 des Dichtbandes 7 oder unmittelbar über seine im wesentlichen ebene, freiliegende obere Fläche 19 (Fig. 3) abgestützt ist, die zumindest näherungsweise rechtwinklig zu der Längsmittelebene 15 verläuft.As can be seen in FIGS. 2-5, the reinforcement is tion band 13 in any case so wide that it overlaps the bearing surfaces 14 on both sides of the longitudinal slot 5. The stiffening tape 13 can either be embedded in the sealing tape 7 in the manner shown in FIGS. 2, 4 and 5, at least over part of its width, or, as illustrated in FIG. 3, can be attached to the sealing tape 7 on top so that it is supported against the bearing surfaces 14 either via intermediate parts 18 of the sealing tape 7 or directly via its essentially flat, exposed upper surface 19 (FIG. 3), which runs at least approximately at right angles to the longitudinal center plane 15.

Das Versteifungsband 13 überquert somit den Längsschlitz 5 und gibt über seine Abstützung auf den Auflageflächen 14 dem Dichtband 7 im Bereiche des Längsschlitzes 5 Halt, so daß auch bei hohem, in dem Zylinderrohrinnenraum 3 herrschendem Druckmitteldruck das mit Rücksicht auf die Dichtwirkung verhältnismäßig leicht verformbare Dichtband 7 nicht in den Längsschlitz 5 hineingedrückt werden kann. Um bei sehr hoher Druckbeaufschlagung zu verhüten, daß sich das dünne Versteifungsband 13 - und damit das Dichtband 7 - merklich in den Längsschlitz 5 hineinwölben, ist bei der Ausführungsform nach Fig. 3 die Anordnung derart getroffen, daß das Versteifungsband 13 die Auflageflächen 14 über eine Auflagebreite übergreift, die größer ist als die Weite des Längsschlitzes 5. Die über die Breite der Auflageflächen 14 wirkende Druckbeaufschlagung ist bestrebt, die entsprechenden, durch die Unterschneidungen 16 frei beweglichen Bereiche des Versteifungsbandes 13, bezogen auf Fig. 3, nach oben zu drücken, was der im Bereiche des Längsschlitzes 5 erfolgenden, ebenfalls nach oben zu gerichteten Verformung des Versteifungsbandes 13 entgegenwirkt. Zufolge der gewählten Auflagebreite des Versteifungsbandes 13 kann erreicht werden, daß das Versteifungsband im Bereiche des Längsschlitzes 5 im wesentlichen eben bleibt oder sogar zum Zylinderrohrinnenraum 3 hin etwas konvex ausgewölbt wird.The stiffening band 13 thus crosses the longitudinal slot 5 and, via its support on the bearing surfaces 14, holds the sealing tape 7 in the area of the longitudinal slot 5, so that even with high pressure medium pressure prevailing in the cylinder tube interior 3, the sealing tape 7, which is relatively easily deformable with regard to the sealing effect cannot be pressed into the longitudinal slot 5. In order to prevent at very high pressures that the thin stiffening tape 13 - and thus the sealing tape 7 - bulge noticeably into the longitudinal slot 5, the arrangement in the embodiment according to FIG. 3 is such that the stiffening tape 13 supports the bearing surfaces 14 over a Support width overlaps that is greater than the width of the longitudinal slot 5. The pressure applied across the width of the support surfaces 14 tends to push up the corresponding areas of the stiffening band 13, which are freely movable by the undercuts 16, with reference to FIG. 3. which counteracts the deformation of the stiffening strip 13 which takes place in the region of the longitudinal slot 5 and which is also directed upwards. As a result of the selected contact width of the stiffening band 13, it can be achieved that the stiffening band remains essentially flat in the region of the longitudinal slot 5 or is even curved somewhat convexly towards the interior of the cylinder tube 3.

Da die radiale Abstützung des Dichtbandes 7 über das Versteifungsband 13 in jedem Falle über die von den Dichtflächen 10 unabhängigen Auflageflächen 14 folgt, wird die Dichtwirkung der über Gelenkstellen 21 an dem eigentlichen Dichtband 7 beweglich angeformten Dichtlippen 9 durch das Versteifungsband 13 nicht beeinflußt.Since the radial support of the sealing tape 7 via the stiffening tape 13 follows in any case via the contact surfaces 14 which are independent of the sealing surfaces 10, the sealing effect of the sealing lips 9 which are movably formed via articulation points 21 on the actual sealing tape 7 is not influenced by the stiffening tape 13.

Die Verbindungselemente zwischen dem Dichtband und dem Abdeckband 11 sind bei der Ausführungsform nach Fig. 2 durch einen an dem Abdeckband 11 symmetrisch zur Längsmittelebene angeformten längsverlaufenden, im Querschnitt profilierten Steg 22 und mit diesem zusammenwirkende, an dem Dichtband 7 vorgesehene längsverlaufende Flansche 23 gebildet. Die beiden Flansche 23 sind im Abstand voneinander angeordnet und begrenzen ersichtlich eine Längsnut 24, in die der Steg 22 eingreift. Sie sind im übrigen durch die in Richtung auf den Längsschlitz 5 zu aufgebogenen oder aufgewölbten Randbereiche der das Verstärkungsband 13 teilweise übergreifenden Dichtbandteile 18 gebildet, zwischen denen auf dem Boden der Nut 24 ein freiliegender Mittelbereich vorhanden ist. Beim Abheben des Dichtbandes 7 und des Abdeckbandes 11 von dem Zylinderrohr 1 auf der einen Kolbenseite wird einfach der Steg 22 aus der Längsnut 24 herausgezogen, während er beim Zusammenführen der beiden Bänder 7,11 auf der anderen Kolbenseite sodann wieder in die Längsnut eingeführt wird, wo er von den beiden nach innen zu vorgespannten Flanschen 23 elastisch festgeklemmt wird.The connecting elements between the sealing tape and the cover tape 11 are formed in the embodiment according to FIG. 2 by a longitudinally extending web 22, which is profiled in cross section and formed on the cover tape 11 symmetrically to the longitudinal center plane, and cooperating with this, provided on the sealing tape 7, provided longitudinal flanges 23. The two flanges 23 are arranged at a distance from one another and clearly delimit a longitudinal groove 24 into which the web 22 engages. They are formed, moreover, by the edge areas of the sealing tape parts 18 which partially overlap the reinforcing tape 13 in the direction towards the longitudinal slot 5 and between which an exposed central area is present on the bottom of the groove 24. When the sealing tape 7 and the cover tape 11 are lifted off the cylinder tube 1 on one piston side, the web 22 is simply pulled out of the longitudinal groove 24, while when the two bands 7, 11 on the other piston side are brought together, it is then reinserted into the longitudinal groove, where it is clamped elastically by the two inward to prestressed flanges 23.

Auf der Zylinderrohraußenseite ist beidseitig des Längsschlitzes 5 jeweils eine Vertiefung 25 ausgebildet, die das Abdeckband 11 aufnimmt. Die Anordnung ist dabei derart getroffen, daß das Abdeckband 11 auf dem Boden der Vertiefungen 25 im seitlichen Abstand von der Berandung des Längsschlitzes 5 über angeformte Abstützwülste 26 abgestützt ist, die auch unter Ausbildung diskreter Abstützelemente in Längsrichtung unterteilt sein könnten. Zwischen den Abstützwülsten 26 und dem Steg 22 ergeben sich dadurch ununterstützte Bereiche 27 des Abdeckbandes 11, die ein unbehindertes, radial nach innen zu gerichtetes Nachfedern des Abdeckbandes 11 gestatten, das es erlaubt, unabhängig von Herstellungstoleranzen in der Dicke der Außenwand des Zylinderrohres 1 oder der Tiefe der Vertiefungen 25 etc. stets eine einwandfreie Halterung des Dichtbandes 7 zu gewährleisten.On both sides of the longitudinal slot 5, a depression 25 is formed on the outside of the cylinder tube, which receives the cover strip 11. The arrangement is such that the cover band 11 is supported on the bottom of the recesses 25 at a lateral distance from the edge of the longitudinal slot 5 via molded support beads 26, which could also be divided in the longitudinal direction with the formation of discrete support elements. This results in unsupported areas 27 of the cover band 11 between the support beads 26 and the web 22, which allow an unimpeded, radially inward springing of the cover band 11, which makes it possible, regardless of manufacturing tolerances in the thickness of the outer wall of the cylinder tube 1 or Depth of the depressions 25, etc., always to ensure that the sealing tape 7 is held properly.

Bei der Ausführungsform nach den Fig. 3 - 5 ist das Dichtband 7 an dem Abdeckband 11 magnetisch gehaltert. Zu diesem Zwecke besteht das Versteifungsband 13 aus einem dünnen ferritischen Stahlband, während an dem Abdeckband 11 ein in Zylinderlängsrichtung verlaufendes, zumindest stellenweise dauermagnetisches Halteband 28 angeordnet ist, das in den Längsschlitz 5 ragt und dessen magnetischer Schließungskreis über das ferromagnetische Versteifungsband 13 verläuft. Das magnetische Halteband 28 kann auf der dem Versteifungsband 13 zugewandten Seite abwechselnd Magnetpole entgegengesetzter Polarität aufweisen, doch kann es auch aus einem biegsamen Kunststoffmaterial bestehen, in das feinverteilte dauermagnetische Partikel eingebettet sind, wie dies bei elastischen Türdichtungsstreifen für Kühlschränke etc. bekannt ist.In the embodiment according to FIGS. 3-5, the sealing tape 7 is held magnetically on the cover tape 11. For this purpose, the stiffening band 13 consists of a thin ferritic steel band, while on the cover band 11 there is arranged at least a permanent magnetic holding band 28 running in the longitudinal direction of the cylinder, which projects into the longitudinal slot 5 and whose magnetic closing circuit runs over the ferromagnetic stiffening band 13. The magnetic holding band 28 can alternately have magnetic poles of opposite polarity on the side facing the stiffening band 13, but it can also consist of a flexible plastic material in which finely divided permanent magnetic particles are embedded, as is known for elastic door sealing strips for refrigerators etc.

Bei den Ausführungsformen nach den Fig. 3,4 sind die Abmessungen der zusammenwirkenden Elemente derart gewählt, daß bei an der Zylinderrohrwandung anliegendem Dichtband 7 das Versteifungsband 13 im wesentlichen ohne Luftspalt unmittelbar an der ihm zugewandten Fläche des magnetischen Haltebandes 28 anliegt. Um die erforderliche radiale Nachgiebigkeit des Abdeckbandes 11 zu erzielen, sind die Vertiefungen 25 jeweils mit einer Längsschulter 29 ausgebildet, auf der das Abdeckband 11 beidseitig streifenförmig in Randnähe aufliegt, so daß sich anschließend wieder der ununterstützte Bereich 27 auf beiden Seiten ergibt. Alternativ könnten naturgemäß auch angeformte Abstützwülste 26 oder dergleichen Elemente verwendet werden, wie dies in Fig. 5 gezeigt ist.In the embodiments according to FIGS. 3, 4, the dimensions of the interacting elements are selected such that when the sealing tape 7 is in contact with the cylinder tube wall, the stiffening tape 13 rests directly against the surface of the magnetic holding tape 28 facing it, essentially without an air gap. In order to achieve the required radial flexibility of the cover band 11, the depressions 25 are each formed with a longitudinal shoulder 29, on which the cover band 11 rests in strips near the edges on both sides, so that the unsupported region 27 then results on both sides. Alternatively, molded support beads 26 or similar elements could naturally also be used, as shown in FIG. 5.

Bei der Ausführungsform nach Fig. 5 ist die Anordnung derart getroffen, daß im Dichtzustand zwischen dem ferromagnetischen Versteifungsband 13 und der diesem zugewandten Fläche des Haltebandes 28 ein Luftspalt 30 ausgebildet ist. Dieser Luftspalt 30 erlaubt einen noch größeren Toleranzausgleich in radialer Richtung zwischen dem Dichtband 7 und dem Halteband 11.In the embodiment according to FIG. 5, the arrangement is such that an air gap 30 is formed in the sealing state between the ferromagnetic stiffening band 13 and the surface of the holding band 28 facing it. This Air gap 30 permits an even greater tolerance compensation in the radial direction between the sealing tape 7 and the holding tape 11.

Claims (19)

1. A pressure medium cylinder having: a longitudinally slotted cylindrical tube (1) which is closed at the ends and in which a sealed piston (4) is longitudinally slidably guided which bears a force-transmitting element (6) extending outwardly through the longitudinal slot (5); a flexible sealing strip (7) which is disposed inside the cylindrical tube and which seals the longitudinal slot in the cylindrical tube in the longitudinal direction of the cylinder and extends under the force-transmitting element in the piston zone and is retained on both sides of the piston bearing against a sealing surface (10) of the inner wall of the cylindrical tube, the cylindrical tube being formed on both sides of the longitudinal slot and adjacent the sealing surfaces with bearing surfaces (14) for the sealing strip; and a flexible covering strip (11) which covers the longitudinal slot of the cylindrical tube, extends over or through the force-transmitting element on the outside of the cylindrical tube in the zone of the force-transmitting element and is retained on the outer wall of the cylindrical tube on both sides of the force-transmitting element, while in the longitudinal direction of the cylinder on both sides of the piston the sealing strip is retained by the covering strip bearing against the associated sealing surface by means of releasable connecting elements (22, 23; 28, 13) cooperating, through the longitudinal slot and extending over the strip length, and in dependence on the longitudinal movement of the piston, the connecting elements are respectively released from one another in front of that side of the piston which is adjacent the decreasing cylinder space and brought into engagement with one another on the other side of the piston, characterized in that the resiliently deformable sealing strip (7) has in known manner connected thereto a reinforcing strip (13) of relatively high strength which is disposed in the inside (3) of the cylindrical tube and is covered in the direction of the piston (4) by the sealing strip (7), and in that each of the bearing surfaces (14), starting from the longitudinal slot (5), ha; an undercut (16) and the reinforcing strip (13) is borne on the bearing surfaces (14).
2. A pressure medium cylinder according to claim 1, characterized in that the reinforcing strip (13) engages over the two bearing surfaces (14) over a bearing width which is greater than the width of the longitudinal slot (5).
3. A pressure medium cylinder according to claims 1 or 2, characterized in that the reinforcing strip (13) bears against the bearing surfaces (14) via interposed portions (18) of the sealing strip (7).
4. A pressure medium cylinder according to one of the preceding claims, characterized in that the reinforcing strip (13) is embedded at least over a portion of its width in the sealing strip (7).
5. A pressure medium cylinder according to one of the preceding claims, characterized in that the substantially flat bearing surfaces (14) are disposed to extend at an acute angle to the longitudinal central plane (15) of the cylindrical tube (1) containing the axis thereof.
6. A pressure medium cylinder according to one of the preceding claims, characterized in that at least on its side adjacent the longitudinal slot (5) the reinforcing strip (13) has a substantially flat surface which extends at least substantially at right angles to the longitudinal central plane (15) of the longitudinal slot (5) containing the axis of the cylindrical tube.
7. A pressure medium cylinder according to one of the preceding claims, characterized in that in the zone of the longitudinal slot (5) the sealing strip (7) and/or the reinforcing strip (13) is guided with provision for radially limited lateral movement by guide surfaces (17) formed in the wall of the cylindrical tube.
8. A pressure medium cylinder according to one of the preceding claims, characterized in that adjacent the reinforcing strip (13) the sealing strip (7) has laterally projecting profiled sealing lips (9) which cooperate with the sealing surfaces (10).
9. A pressure medium cylinder according to one of the preceding claims, characterized in that the covering strip (11) or the sealing strip (7), acting as connecting elements, has at least one web (22) of profiled cross-section extending in the longitudinal direction of the cylinder into the longitudinal slot (5), while the sealing strip (7) or the covering strip (11) has two flanges (23) which bound a longitudinal groove (24) and between which the web (22) can be resiliently retained; the reinforcing strip (13) is enclosed by the sealing strip (7) on the side adjacent the longitudinal slot (5), leaving a strip-like central zone extending in the longitudinal direction of the strip; and the flanges (23) are formed by the edge zones of the sealing strip material (18) bounding the central zone which are upwardly bent or upwardly arched if necessary in the direction of the longitudinal slot (5).
10. A pressure medium cylinder according to one of the preceding claims, characterized in that the thin reinforcing strip (13) is made of a plastics material.
11. A pressure medium cylinder according to one of claims 1 to 10, characterized in that the thin reinforcing strip (13) is made of steel.
12. A pressure medium cylinder according to claim 11, characterized in that the thin reinforcing strip (13) is made of ferritic steel.
13. A pressure medium cylinder according to claim 12, characterized in that provided as a connecting element to the covering strip (11) is a retaining strip (28) permanently magnetic at least in places which extends in the longitudinal direction of the cylinder into the longitudinal slot (5) and whose magnetic closure circuit extends via the reinforcing strip (13).
14. A pressure medium cylinder according to claim 13, characterized in that the magnetic retaining strip (28) has alternately magnetic poles of opposite polarity on the side adjacent the reinforcing strip (13).
15. A pressure medium cylinder according to claim 14, characterized in that the retaining strip (28) is made of a flexible strip of plastics material into which permanently magnetic parts are inserted at intervals.
16. A pressure medium cylinder according to one of claims 12 to 15, characterized in that in the sealing condition the surface of the retaining strip (28) adjacent the reinforcing strip (13) extends at a distance from the reinforcing strip (13), with the formation of an air gap (30).
17. A pressure medium cylinder according to one of the preceding claims, characterized in that the covering strip (11) is borne at a lateral distance from the edge of the longitudinal slot (5) on the outside wall of the cylindrical tube (1) or on the bottom of a depression (25) extending in the cylindrical tube in the outer direction alongside the longitudinal slot (5), while unsupported zones (27) of the covering strip (11) are disposed between the bearing places (26; 29) and the edge of the longitudinal slot.
18. A pressure medium cylinder according to claim 17, characterized in that the covering strip (11) has moulded-on supporting beads (26) or supporting elements on both sides in the zone of its edge.
19. A pressure medium cylinder according to claims 17 or 18, characterized in that in the unsupported zones (27) the covering strip (11) has a shape influencing its resilient properties.
EP86115369A 1986-09-17 1986-11-06 Pressure fluid cylinder Expired - Lifetime EP0260344B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86115369T ATE54015T1 (en) 1986-09-17 1986-11-06 PRESSURE CYLINDER.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3631514 1986-09-17
DE19863631514 DE3631514A1 (en) 1986-09-17 1986-09-17 PRESSURE CYLINDER

Publications (3)

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EP0260344A2 EP0260344A2 (en) 1988-03-23
EP0260344A3 EP0260344A3 (en) 1988-08-03
EP0260344B1 true EP0260344B1 (en) 1990-06-20

Family

ID=6309700

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EP86115369A Expired - Lifetime EP0260344B1 (en) 1986-09-17 1986-11-06 Pressure fluid cylinder

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US (1) US4733604A (en)
EP (1) EP0260344B1 (en)
JP (1) JPS6376902A (en)
AT (1) ATE54015T1 (en)
BR (1) BR8702689A (en)
CA (1) CA1271689A (en)
DE (2) DE3631514A1 (en)
ES (1) ES2016241B3 (en)

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Also Published As

Publication number Publication date
ATE54015T1 (en) 1990-07-15
DE3672152D1 (en) 1990-07-26
EP0260344A3 (en) 1988-08-03
ES2016241B3 (en) 1990-11-01
DE3631514A1 (en) 1988-03-24
EP0260344A2 (en) 1988-03-23
BR8702689A (en) 1988-04-26
US4733604A (en) 1988-03-29
CA1271689A (en) 1990-07-17
JPS6376902A (en) 1988-04-07

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