EP0069199B1 - Fluid pressure actuator - Google Patents

Fluid pressure actuator Download PDF

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Publication number
EP0069199B1
EP0069199B1 EP82103075A EP82103075A EP0069199B1 EP 0069199 B1 EP0069199 B1 EP 0069199B1 EP 82103075 A EP82103075 A EP 82103075A EP 82103075 A EP82103075 A EP 82103075A EP 0069199 B1 EP0069199 B1 EP 0069199B1
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EP
European Patent Office
Prior art keywords
cylinder
piston
strip
sealing
cylinder tube
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP82103075A
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German (de)
French (fr)
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EP0069199A1 (en
Inventor
Siegmund H. Kaiser
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Norgren Martonair Europa GmbH
Original Assignee
Proma Produkt- und Marketing-Gesellschaft Mbh
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Publication date
Application filed by Proma Produkt- und Marketing-Gesellschaft Mbh filed Critical Proma Produkt- und Marketing-Gesellschaft Mbh
Priority to AT82103075T priority Critical patent/ATE10128T1/en
Publication of EP0069199A1 publication Critical patent/EP0069199A1/en
Application granted granted Critical
Publication of EP0069199B1 publication Critical patent/EP0069199B1/en
Expired legal-status Critical Current

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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, which carries a force transmission element projecting outward through the longitudinal slot, the longitudinal slot of the cylinder tube in the longitudinal direction of the cylinder being arranged in the piston area under the piston area inside the cylinder tube Power transmission element passed and sealed on both sides of the piston in contact with a sealing surface of the cylinder tube inner wall is sealed and covered on the cylinder tube outside by a flexible transmission tape in the area of the force transmission element passing through or through it and on both sides of the force transmission element on the cylinder tube outer wall.
  • Hydraulically or pneumatically operated working cylinders of this type have no piston rod and are therefore characterized by a short installation length and the elimination of the disadvantages that are otherwise associated with the piston rod emerging from the cylinder, for example damage to the surface, buckling of the piston rod, etc.
  • force exerted on the piston by the pressure medium is transmitted to the device to be driven via the force transmission element which is arranged directly on the piston and projects outward through the longitudinal slot of the cylinder tube.
  • the pressure chamber located on both sides of the piston is sealed in the axial direction of the cylinder tube by sealing rings or sleeves of the piston, while the longitudinal slot of the cylinder tube is sealed in this area by the sealing tape which is guided in the pressure-free area between the piston seals under the force transmission element.
  • the sealing strip which has an approximately rectangular cross-sectional shape, lies in a longitudinal groove arranged on the inside in the region of the longitudinal slot, which forms flat contact surfaces and lateral guide surfaces for the sealing strip.
  • the sealing tape is pressed against the bearing surfaces by the pressure medium pressure prevailing in the pressure chambers, precautions must be taken, as practical experience has shown, to prevent the sealing tape from sagging into the pressure chamber when depressurized, because otherwise at a temporary leak occurs when the pressure medium is applied. To this extent, no precautions have been taken with this pressure medium cylinder.
  • the situation is similar in a pressure medium cylinder known from DE-A-2453948, in which a flexible strip is additionally glued onto the outside of the cylinder as dust protection and has an elastically self-closing longitudinal slot that allows the passage of the force transmission element.
  • a pressure medium cylinder known from DE-C-846 493, in which a sealing strip with an essentially U-shaped cross-sectional shape is used, the flanges of which can enter into corresponding recesses on the inner wall of the cylinder tube, in order to thereby seal the pressure chambers improve and at the same time increase the resistance of the cylinder tube against expansion.
  • the production of the parallel recesses on the inner wall of the cylinder tube is associated with considerable manufacturing outlay, apart from the fact that the piston requires special training in order to properly insert the sealing tape with its flanges into the recess.
  • the arrangement has already been made in a pressure medium cylinder known from DE-A-2 162 572 in such a way that the cylinder consists of a non-magnetized material and at least on one of the two parallel wall areas delimiting the longitudinal slot Has magnetic body that attract the sealing material of the sealing tape consisting of magnetizable material.
  • a metallic sealing tape is, however, not very suitable for sealing liquids because of the unavoidable micro leakage, so that practically only compressed air can be used as a pressure medium.
  • the thin metal tape serving as a sealing tape is not guided laterally through the magnetic body, which entails the risk that the sealing tape can occasionally experience a lateral offset with respect to the longitudinal slot, which can lead to the so-called tape explosions feared because of the associated risk of accidents.
  • FIG. 3 In one embodiment (FIG. 3) of this German published patent application, it is known to provide on the outside of the cylinder tube a further, also metallic cover strip covering the longitudinal slot on both sides of the force transmission element, which has the task of keeping the longitudinal slot closed to the outside in order to to prevent dirt from entering the longitudinal slot.
  • This metallic masking tape is also held by magnetic bodies. The magnetic holder both inside and outside the cylinder tube and the profile-ground steel strips require a large amount of production.
  • a pressure medium cylinder in which a relatively thin cylindrical lining of the cylinder is used to seal the longitudinal slot the interior is made of plastic material or metal, the longitudinal edges of which either abut one another in a sealing manner or overlap one another, the lining being pressed against the wall of the cylinder in a sealing manner by self-suspension.
  • the longitudinal slot On the outside, the longitudinal slot is protected by rubber strips against the ingress of dust or the like, which are pressed together under the effect of their own elasticity.
  • a lining arranged in the cylinder interior influences the sealing conditions of the pressure chambers through the piston; it is also subject to considerable wear resulting from the piston movement, both of which are undesirable.
  • the object of the invention is therefore to provide a pressure medium cylinder of the type mentioned, which is characterized by a perfect sealing of the pressure chambers located on both sides of the piston with little manufacturing effort.
  • the pressure medium cylinder according to the invention is characterized in that in the longitudinal direction of the cylinder, on both sides of the piston, the sealing tape is held in contact with the associated sealing surface by the cover tape by means of interacting, detachable connecting elements which project through the longitudinal slot and extend over the length of the tape, and the connecting elements depending on the longitudinal movement of the piston in each case continuously in front of that piston side that is facing the shrinking cylinder space, detached from one another and brought into engagement with one another on the other piston side.
  • the pressure medium cylinder is therefore also ideally suited for liquid pressure medium. Since the sealing tape is held through the already existing longitudinal slot, there is also no need for separate mounting elements to be arranged on the cylinder, with the result that the production outlay for the new pressure medium cylinder can be kept very small.
  • the connecting elements consist of at least one web, which runs in the longitudinal direction of the cylinder, is arranged on the sealing band or the cover band in the radial direction of the cylinder tube, has a cross-sectional profile and an associated web which also runs on the other band in the longitudinal direction of the cylinder, corresponding to the web cross-section form-fitting encompassing, also in cross-section profiled longitudinal groove, the side walls of which can be elastically expanded to accommodate the web.
  • cross-section of the web and the longitudinal groove have an at least partially directed wedge-shaped profile shape in the direction of the cylinder axis, and the wedge-shaped parts of the web and the longitudinal groove are arranged behind one another, so that when connecting elements are joined together, a positive connection between these results.
  • the profile cross section of the longitudinal groove and / or of the web can then have a wedge-shaped part facing the respective band, radially parallel to the cylinder tube, essentially parallel, straight-flanked part, while the web on its free, radially directed to the cylinder tube and facing away from the associated band end a radially Conver g rendesEinteil IE has, thereby facilitating the joining of the connection elements and their engagement can be improved.
  • the sealing tape expediently has a guide part, which is supported on two bearing surfaces of the cylinder tube on both sides of the longitudinal slot and is laterally guided by radially arranged guide surfaces and on which the associated connecting element is arranged.
  • this guide part in cooperation with the bearing surfaces can effect the entire seal, but an improvement in the sealing conditions can be achieved if the guide part on the side of the guide part facing the interior of the cylinder tube, symmetrically to the plane of symmetry of the sealing tape, has two elastically movable sealing lips are connected, which cooperate with sealing surfaces of the cylinder tube wall, which are arranged, if appropriate, recessed in the cylinder tube.
  • sealing lips are advantageously movably held at their roots on the guide part and have a wedge-shaped decreasing cross-sectional shape when directed away from their roots.
  • the surface of the sealing tape facing the cylinder axis can be designed to complement the inner circumferential surface of the interior of the cylinder tube
  • the force transmission element has a band-expanding part which extends in a wedge-shaped manner on both sides in the longitudinal direction of the cylinder tube and which lies between the cover and the sealing band.
  • the force transmission element in the longitudinal direction of the cylinder tube can have a pressure element acting on the outside of the cover band from the outside and pressing it onto the cylinder tube outer wall, which is arranged in each case in the length region of the piston and in cooperation with the piston - on the piston side trailing during a piston movement - the connecting elements with one another engages.
  • the masking tape and / or the sealing tape can consist of an elastic plastic material, the properties of which are chosen with regard to the mechanical stresses occurring and the pressure medium used. In principle, however, it is also conceivable to alternatively use fabric-reinforced rubber material or the like for this purpose.
  • the pressure medium cylinder shown in FIGS. 1 to 3 has a cylinder tube 1 which contains an interior 2 in the form of an eccentrically arranged cylinder bore and is formed with a continuous longitudinal slot 3.
  • the cylinder tube 1 is pressure-tightly closed at both ends by end caps 4; in it a piston 5 is displaceably guided, which carries a sealing collar at each end at 6 and 7 and is thus sealed against the inner wall of the cylinder bore 2.
  • the piston is designed at 8 with a reduced diameter.
  • a force transmission element 9 is screwed to it, which has a web-like part 10 which leads outwards through the longitudinal slot 3 to the side and to which a bracket 11, which laterally overlaps the cylinder tube 1, is connected, on which two parallel flanges arranged at a distance from one another 12 sit, which are used to couple the power transmission element 9 to a device, not shown, actuated by the pressure medium cylinder.
  • the bracket 11, which has an essentially U-shaped cross-sectional shape, is provided in the region of its legs 13 with two guide strips 14 inserted into corresponding longitudinal grooves, which are adjustable by means of set screws 15 and are displaceably guided in corresponding longitudinal grooves 16 of the cylinder tube 1.
  • the two legs 13 can also be extended downwards, as indicated at 17 in FIG. 2, and carry additional guide strips 14a which cooperate with corresponding longitudinal grooves 16a.
  • the guide strips 14 result in a parallel guide for the force transmission element 9 and at the same time prevent the cylinder tube 1 from expanding in the region of the longitudinal slot 3.
  • a sealing tape 18 Arranged in the cylinder interior 2 is a sealing tape 18 consisting of a flexible, elastic plastic material, which is anchored at the ends in the two end caps 4.
  • the sealing tape 18 serves to seal the longitudinal slot in the area of the pressure chambers 19, 20 between the piston 5 and the two end caps 4 and the pressure medium cylinder and extends over the entire length of the cylinder tube 1.
  • the sealing tape 18 has a base or guide part 21 of essentially rectangular cross-sectional shape, which can rest on both sides of the longitudinal slot 3 on a flat bearing surface 22 arranged at the bottom of a longitudinal groove and is guided laterally by two guide surfaces 23 formed by the groove side walls.
  • two wedge-shaped elastic sealing lips 24 with an acute angle in cross-section are arranged on the guide part, and at their roots - at 250 - the guide part 21 is formed so as to be movable.
  • the sealing lips 24 bear against associated sealing surfaces 25 incorporated into the wall of the cylinder interior 2, the arrangement being such that the sealing tape 18 complements the outline of the cylinder interior 2 without gaps in the manner shown in FIG. 3 in particular.
  • the sealing tape 18 On the upper side of the guide part 21, the sealing tape 18 carries a molded central web 26 forming a connecting element, which projects into the longitudinal slot 3 and is arranged symmetrically to the latter.
  • the longitudinal slot 3 On the outside of the cylinder tube 1, the longitudinal slot 3 is covered by a flexible cover band 27 consisting of a flexible elastic plastic material, which also extends over the length of the cylinder tube 1 and is anchored in the end caps 4 at both ends.
  • the cover band 27 is approximately rectangular in cross section and lies in a corresponding longitudinal groove 28 of the cylinder tube 1, from the bottom of which the longitudinal slot 3 opens.
  • a second connecting element is arranged in the form of a longitudinal groove 30 delimited by two molded-on parallel legs 29, which has a substantially U-shaped cross section and, like the web 26, extends over the entire length of the cover band 27 or Sealing tape 18 extends.
  • the web 26 is formed at its root with a parallel and straight-flanked part 31, which is adjoined by a wedge-shaped part 32 that widens outwards, on which a converging insertion part 33, which in the present case is approximately trapezoidal in cross section, but possibly also rounded follows.
  • a converging insertion part 33 which in the present case is approximately trapezoidal in cross section, but possibly also rounded follows.
  • they wear the longitudinal groove 30 delimiting legs 29 on their inside wedge-shaped parts 34 which lie opposite each other and converge towards the groove opening.
  • the arrangement is such that the web 26 in the manner shown in FIG. 4 with elastic lateral remindwei chen the leg 29 of the cover tape 27 can be pressed continuously into the longitudinal groove 30, whereby a firm connection between the cover tape 27 and results in the sealing tape 18, since the wedge surfaces 34, 32 engage behind one another in the assembled state of the connecting elements and produce a positive connection.
  • the bevelled insertion part 33 facilitates the insertion of the web 26 into the longitudinal groove 30, while the straight-sided parts 31 and 34a ensure that the wedge-shaped parts 32, 34 can come into contact with one another without any problems.
  • a plurality of webs and longitudinal grooves arranged parallel to one another could of course also be provided in another embodiment, not shown, as would also be conceivable for the web 26 on the cover band 27 and the longitudinal groove 30 instead to provide on the sealing tape 18.
  • the sealing tape 18 is passed through an opening 35 (FIGS. 1, 2) under the force transmission element 9, which has a tape expansion part 36 which is arranged in the region of the piston part 8 and extends in a wedge-shaped manner on both sides in the longitudinal direction of the cylinder tube, over the top of which the cover tape 27 is guided, that the band expansion part 36 lies between the two bands 18, 27.
  • the force transmission element 9 carries, in the region of its two ends, a pressure element 37 which acts on the cover band 27 and presses it against the cylinder tube wall, in the manner of a roller, which - as can be seen from FIG. 1 - is essentially above the sleeve 6 or 7 supporting piston part is arranged.
  • the sealing sleeve 7 On the other side of the piston (on the right in FIG. 1), when the piston 5 moves to the left, the sealing sleeve 7 carries the piston part and the right pressing member 37 continuously engages the web 26 of the sealing tape 18 into the longitudinal groove 30 of the cover tape 27, so that the right pressure chamber 20 is always properly sealed.
  • the pressure medium cylinder can be operated with any gaseous or liquid pressure medium.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

1. A pressure fluid cylinder comprising a longitudinally slotted cylinder tube (1) closed at its ends and enclosing a piston (5) provided therein in sealed relationship and for longitudinal displacement, which pistons carries a load transmission element (9) projecting outwardly through the longitudinal slot (3), the longitudinal slot (3) of the cylindrical tube (1) being sealed in the longitudinal direction of the cylinder by a sealing strip which is provided in the interior (2) of the cylinder tube, passes in the zone of the piston underneath the load transmission element (9) and is retained in contact, on both sides of the piston (5), with a sealing face (22, 25) of the cylinder tube wall, and being covered on the outside of the cylinder tube by a flexible cover strip (27) passing in the zone of the load transmission element (9) over or through the latter and being retained on the outer cylinder wall on both sides of the load transmission element (9), characterized in that the sealing strip (18) is held by the cover strip (27) in contact with the associated sealing face (22, 25) on both sides of the piston (5), through coacting releasable connection elements (26, 30) passing through the longitudinal slots (3) and extending over the length of the strip and that the connection elements (26, 30) are continuously released, in response to the longitudinal movement of the piston (5), in front of that end of the piston which faces the diminishing cylinder space (19 or 20) and engaged on the opposite side of the piston.

Description

Die Erfindung betrifft einen Druckmittelzylinder mit einem endseitig verschlossenen, längsgeschlitzten Zylinderrohr, in dem ein abgedichteter Kolben längsverschieblich geführt ist, der ein durch den Längsschlitz nach außen ragendes Kraftübertragungselement trägt, wobei der Längsschlitz des Zylinderrohres in Zylinderlängsrichtung durch ein im Zylinderrohrinneren angeordnetes, im Kolbenbereich unter dem Kraftübertragungselement hindurchgeführtes, sowie beidseitig des Kolbens in Anlage an einer Dichtfläche der Zylinderrohrinnenwand gehaltenes Dichtband abgedichtet und auf der Zylinderrohraußenseite durch ein im Bereich des Kraftübertragungselementes über dieses hinweg oder durch dieses hindurchgeführtes, sowie beidseitig des Kraftübertragungselementes an der Zylinderrohraußenwand gehaltenes biegsames Abdeckband abgedeckt ist.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, which carries a force transmission element projecting outward through the longitudinal slot, the longitudinal slot of the cylinder tube in the longitudinal direction of the cylinder being arranged in the piston area under the piston area inside the cylinder tube Power transmission element passed and sealed on both sides of the piston in contact with a sealing surface of the cylinder tube inner wall is sealed and covered on the cylinder tube outside by a flexible transmission tape in the area of the force transmission element passing through or through it and on both sides of the force transmission element on the cylinder tube outer wall.

Hydraulisch oder pneumatisch betätigte Arbeitszylinder dieser Art weisen keine Kolbenstange auf und zeichnen sich deshalb durch eine geringe Einbaulänge, sowie den Wegfall der Nachteile aus, die mit der aus dem Zylinder austretenden Kolbenstange sonst verbunden sind, beispielsweise Beschädigung der Oberfläche, Ausknicken der Kolbenstange etc. Die von dem Druckmedium auf den Kolben ausgeübte Kraft wird über das unmittelbar an dem Kolben angeordnete, durch den Längsschlitz des Zylinderrohres nach außen ragende Kraftübertragungselement auf die anzutreibende Einrichtung übertragen. Die Abdichtung des beidseitig des Kolbens liegenden Druckraumes erfolgt in Achsrichtung des Zylinderrohres durch Dichtringe oder -manschetten des Kolbens, während der Längsschlitz des Zylinderrohres in diesem Bereich durch das Dichtband abgedichtet ist, das in dem drucklosen Bereich zwischen den Kolbendichtungen unter dem Kraftübertragungselement hindurchgeführt ist.Hydraulically or pneumatically operated working cylinders of this type have no piston rod and are therefore characterized by a short installation length and the elimination of the disadvantages that are otherwise associated with the piston rod emerging from the cylinder, for example damage to the surface, buckling of the piston rod, etc. force exerted on the piston by the pressure medium is transmitted to the device to be driven via the force transmission element which is arranged directly on the piston and projects outward through the longitudinal slot of the cylinder tube. The pressure chamber located on both sides of the piston is sealed in the axial direction of the cylinder tube by sealing rings or sleeves of the piston, while the longitudinal slot of the cylinder tube is sealed in this area by the sealing tape which is guided in the pressure-free area between the piston seals under the force transmission element.

Bei einem aus der DE-C-843482 bekannten Druckmittelzylinder liegt das eine etwa rechtekkige Querschnittsgestalt aufweisende Dichtband in einer im Bereiche des Längsschlitzes innen angeordneten Längsnut, die ebene Auflageflächen und seitliche Führungsflächen für das Dichtband bildet. Das Dichtband wird zwar durch den in den Druckräumen herrschenden Druckmitteldruck an die Auflageflächen abdichtend angepreßt, doch müssen, wie die praktische Erfahrung gezeigt hat, Vorkehrungen getroffen werden, um zu vermeiden, daß das Dichtband im drucklosen Zustand in den Druckraum hinein durchhängt, weil sonst bei der Druckmittelbeaufschlagung eine vorübergehende Leckage auftritt. Insoweit sind bei diesem Druckmittelzylinder aber keine Vorkehrungen getroffen. Ähnlich sind die Verhältnisse auch bei einem aus der DE-A-2453948 bekannten Druckmittelzylinder, bei dem zusätzlich als Staubschutz außen auf den Zylinder ein flexibler Streifen aufgeklebt ist, der einen den Durchtritt des Kraftübertragungselementes gestattenden, sich elastisch selbst schließenden Längsschlitz aufweist.In a pressure medium cylinder known from DE-C-843482, the sealing strip, which has an approximately rectangular cross-sectional shape, lies in a longitudinal groove arranged on the inside in the region of the longitudinal slot, which forms flat contact surfaces and lateral guide surfaces for the sealing strip. Although the sealing tape is pressed against the bearing surfaces by the pressure medium pressure prevailing in the pressure chambers, precautions must be taken, as practical experience has shown, to prevent the sealing tape from sagging into the pressure chamber when depressurized, because otherwise at a temporary leak occurs when the pressure medium is applied. To this extent, no precautions have been taken with this pressure medium cylinder. The situation is similar in a pressure medium cylinder known from DE-A-2453948, in which a flexible strip is additionally glued onto the outside of the cylinder as dust protection and has an elastically self-closing longitudinal slot that allows the passage of the force transmission element.

Grundsätzlich gleiches gilt auch für einen aus der DE-C-846 493 bekannten Druckmittelzylinder, bei dem ein Dichtstreifen mit einer im wesentlichen U-förmigen Querschnittsgestalt Verwendung findet, dessen Flansche in entsprechende Aussparungen auf der Zylinderrohrinnenwand eintreten können, um damit die Abdichtung der Druckräume zu verbessern und gleichzeitig die Widerstandsfähigkeit des Zylinderrohres gegen Aufweitung zu erhöhen. Darüber hinaus ist die Herstellung der parallelen Aussparungen auf der Zylinderrohrinnenwand mit erheblichem Herstellungsaufwand verbunden, abgesehen davon, daß der Kolben einer besonderen Ausbildung bedarf, um das Dichtband ordnungsgemäß mit seinen Flanschen in die Aussparung einzuführen.Fundamentally the same also applies to a pressure medium cylinder known from DE-C-846 493, in which a sealing strip with an essentially U-shaped cross-sectional shape is used, the flanges of which can enter into corresponding recesses on the inner wall of the cylinder tube, in order to thereby seal the pressure chambers improve and at the same time increase the resistance of the cylinder tube against expansion. In addition, the production of the parallel recesses on the inner wall of the cylinder tube is associated with considerable manufacturing outlay, apart from the fact that the piston requires special training in order to properly insert the sealing tape with its flanges into the recess.

Um hier eine Vereinfachung zu erzielen, wurde bei einem aus der DE-A-2 162 572 bekannten Druckmittelzylinder die Anordnung auch schon derart getroffen, daß der Zylinder aus einem nicht-magnetisierten Werkstoff besteht und wenigstens an einem der beiden parallelen, den Längsschlitz begrenzenden Wandbereich Magnetkörper aufweist, die das aus magnetisierbarem Werkstoff bestehende Dichtungsmaterial des Dichtbandes anziehen. Ein solches metallisches Dichtband ist aber wegen der unvermeidbaren Mikroleckage zur Abdichtung von Flüssigkeiten wenig geeignet, so daß als Druckmittel praktisch nur Druckluft in Frage kommt. Außerdem läßt sich nicht ausschließen, daß die Magnetkörper, die zur Halterung des Dichtbandes dienen, Eisenspäne anziehen, was zu erheblichen Störungen führen kann. Schließlich ist das dünne, als Dichtband dienende Metallband durch die Magnetkörper nicht seitlich geführt, was die Gefahr mit sich bringt, daß das Dichtband bezüglich des Längsschlitzes gelegentlich einen seitlichen Versatz erfahren kann, was zu den wegen der damit verbundenen Unfallgefahr gefürchteten sogenannten Bandexplosionen führen kann.In order to simplify this, the arrangement has already been made in a pressure medium cylinder known from DE-A-2 162 572 in such a way that the cylinder consists of a non-magnetized material and at least on one of the two parallel wall areas delimiting the longitudinal slot Has magnetic body that attract the sealing material of the sealing tape consisting of magnetizable material. Such a metallic sealing tape is, however, not very suitable for sealing liquids because of the unavoidable micro leakage, so that practically only compressed air can be used as a pressure medium. In addition, it cannot be ruled out that the magnetic bodies that serve to hold the sealing tape attract iron filings, which can lead to considerable malfunctions. Finally, the thin metal tape serving as a sealing tape is not guided laterally through the magnetic body, which entails the risk that the sealing tape can occasionally experience a lateral offset with respect to the longitudinal slot, which can lead to the so-called tape explosions feared because of the associated risk of accidents.

Bei einer Ausführungsform (Fig.3) dieser deutschen Offenlegungsschrift ist es bekannt, auf der Außenseite des Zylinderrohres ein weiteres, den Längsschlitz beidseitig des Kraftübertragungselementes abdeckendes, ebenfalls metallisches Abdeckband vorzusehen, das die Aufgabe hat, den Längsschlitz nach außen hin verschlossen zu halten, um damit das Eindringen von Schmutz in den Längsschlitz zu verhüten. Auch dieses metallische Abdeckband ist durch Magnetkörper gehaltert. Die Magnethalterung sowohl innerhalb als auch außerhalb des Zylinderrohres und die profilgeschliffenen Stahlbänder bedingen einen großen Herstellungsaufwand.In one embodiment (FIG. 3) of this German published patent application, it is known to provide on the outside of the cylinder tube a further, also metallic cover strip covering the longitudinal slot on both sides of the force transmission element, which has the task of keeping the longitudinal slot closed to the outside in order to to prevent dirt from entering the longitudinal slot. This metallic masking tape is also held by magnetic bodies. The magnetic holder both inside and outside the cylinder tube and the profile-ground steel strips require a large amount of production.

Schließlich ist aus der DD-A-83708 noch ein Druckmittelzylinder bekannt, bei dem zur Abdichtung des Längsschlitzes eine verhältnismäßig dünne zylindrische Ausfütterung des Zylinderinnenraumes aus Kunststoffmaterial oder Metall vorgesehen ist, deren Längskanten entweder dichtend aneinander stoßen oder einander überlappen, wobei die Ausfütterung durch Eigenfederung abdichtend an die Wand des Zylinders angedrückt ist. Auf der Außenseite ist der Längsschlitz durch Gummistreifen gegen das Eindringen von Staub oder dergl. geschützt, die unter der Wirkung ihrer Eigenelastizität aneinander gedrückt sind. Eine in dem Zylinderinnenraum angeordnete Ausfütterung beeinflußt aber die Abdichtungsverhältnisse der Druckräume durch den Kolben; sie unterliegt auch einem von der Kolbenbewegung herrührenden erheblichen Verschleiß, was beides unerwünscht ist.Finally, from DD-A-83708 a pressure medium cylinder is known in which a relatively thin cylindrical lining of the cylinder is used to seal the longitudinal slot the interior is made of plastic material or metal, the longitudinal edges of which either abut one another in a sealing manner or overlap one another, the lining being pressed against the wall of the cylinder in a sealing manner by self-suspension. On the outside, the longitudinal slot is protected by rubber strips against the ingress of dust or the like, which are pressed together under the effect of their own elasticity. A lining arranged in the cylinder interior influences the sealing conditions of the pressure chambers through the piston; it is also subject to considerable wear resulting from the piston movement, both of which are undesirable.

Aufgabe der Erfindung ist es deshalb, einen Druckmittelzylinder der eingangs genannten Art zu schaffen, der sich bei geringem Herstellungsaufwand durch eine einwandfreie Abdichtung der beidseitig des Kolbens liegenden Druckräume auszeichnet.The object of the invention is therefore to provide a pressure medium cylinder of the type mentioned, which is characterized by a perfect sealing of the pressure chambers located on both sides of the piston with little manufacturing effort.

Zur Lösung dieser Aufgabe ist der Druckmittelzylinder gemäß der Erfindung dadurch gekennzeichnet, daß in Zylinderlängsrichtung beidseitig des Kolbens das Dichtband durch das Abdeckband mittels zusammenwirkender, durch den Längsschlitz hindurchragender und sich über die Bandlänge erstreckender lösbarer Verbindungselemente in Anlage an der zugeordneten Dichtfläche gehalten ist und die Verbindungselemente in Abhängigkeit von der Längsbewegung des Kolbens 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.To achieve this object, the pressure medium cylinder according to the invention is characterized in that in the longitudinal direction of the cylinder, on both sides of the piston, the sealing tape is held in contact with the associated sealing surface by the cover tape by means of interacting, detachable connecting elements which project through the longitudinal slot and extend over the length of the tape, and the connecting elements depending on the longitudinal movement of the piston in each case continuously in front of that piston side that is facing the shrinking cylinder space, detached from one another and brought into engagement with one another on the other piston side.

Dadurch, daß das Abdeckband über die Verbindungselemente das Dichtband im Bereiche der Druckräume stets in Anlage an der Dichtfläche hält, sind einwandfreie Abdichtungsverhältnisse gewährleistet. Ein Durchhängen des Dichtbandes ist auch bei großer Zylinderlänge ausgeschlossen. Der Druckmittelzylinder ist deshalb auch für flüssige Druckmittel hervorragend geeignet. Da die Halterung des Dichtbandes durch den ohnehin vorhandenen Längsschlitz hindurch erfolgt, entfallen auch eigene, an dem Zylinder anzuordnende Halterungselemente, mit dem Ergebnis, daß der Herstellungsaufwand für den neuen Druckmittelzylinder sehr klein gehalten werden kann.The fact that the cover tape always holds the sealing tape in contact with the sealing surface in the area of the pressure chambers via the connecting elements, ensures perfect sealing conditions. Sagging of the sealing tape is also ruled out with long cylinder lengths. The pressure medium cylinder is therefore also ideally suited for liquid pressure medium. Since the sealing tape is held through the already existing longitudinal slot, there is also no need for separate mounting elements to be arranged on the cylinder, with the result that the production outlay for the new pressure medium cylinder can be kept very small.

In einer bevorzugten Ausführungsform bestehen die Verbindungselemente aus wenigstens einem, in Zylinderlängsrichtung verlaufenden, an dem Dichtband oder dem Abdeckband in radialer Richtung des Zylinderrohres angeordneten, im Querschnitt profilierten Steg und einer diesem zugeordneten, an dem jeweils anderen Band ebenfalls in Zylinderlängsrichtung verlaufenden, den Stegquerschnitt entsprechend formschlüssig umgreifenden, ebenfalls in Querschnitt profilierten Längsnut, deren Seitenwände zur Aufnahme des Steges elastisch aufweitbar sind. Dabei hat es sich als vorteilhaft erwiesen, wenn der Steg und die Längsnut im Querschnitt eine zumindest teilweise in Richtung Zylinderachse gerichtete, keilförmig schmaler werdende Profilgestalt aufweisen und die keilförmigen Teile des Steges und der Längsnut einander hintergreifend angeordnet sind, so daß sich bei zusammengefügten Verbindungselementen eine formschlüssige Verbindung zwischen diesen ergibt.In a preferred embodiment, the connecting elements consist of at least one web, which runs in the longitudinal direction of the cylinder, is arranged on the sealing band or the cover band in the radial direction of the cylinder tube, has a cross-sectional profile and an associated web which also runs on the other band in the longitudinal direction of the cylinder, corresponding to the web cross-section form-fitting encompassing, also in cross-section profiled longitudinal groove, the side walls of which can be elastically expanded to accommodate the web. It has proven to be advantageous if the cross-section of the web and the longitudinal groove have an at least partially directed wedge-shaped profile shape in the direction of the cylinder axis, and the wedge-shaped parts of the web and the longitudinal groove are arranged behind one another, so that when connecting elements are joined together, a positive connection between these results.

Der Profilquerschnitt der Längsnut und/oder des Steges kann anschließend an den keilförmigen Teil jeweils einen dem jeweiligen Band zugewandten, radial zum Zylinderrohr im wesentlichen parallel-, geradflankigen Teil aufweisen, während der Steg an seinem, zum Zylinderrohr radial gerichteten und dem zugehörigen Band abgewandten freien Ende ein radial konvergie- rendesEinführteil aufweist, wodurch das Zusammenfügen der Verbindungselemente erleichtert und deren Ineinandergreifen verbessert werden können.The profile cross section of the longitudinal groove and / or of the web can then have a wedge-shaped part facing the respective band, radially parallel to the cylinder tube, essentially parallel, straight-flanked part, while the web on its free, radially directed to the cylinder tube and facing away from the associated band end a radially Conver g rendesEinführteil IE has, thereby facilitating the joining of the connection elements and their engagement can be improved.

Das Dichtband weist zweckmäßigerweise einen auf zwei Auflageflächen des Zylinderrohres beidseitig des Längsschlitzes abgestützten, durch radial angeordnete Führungsflächen seitlich geführten Führungsteil auf, an dem das zugeordnete Verbindungselement angeordnet ist. Bei einfachen Ausführungsformen kann dieses Führungsteil im Zusammenwirken mit den Auflageflächen die gesamte Abdichtung bewirken, doch läßt sich eine Verbesserung der Abdichtungsverhältnisse erzielen, wenn mit dem Führungsteil auf der dem Innenraüm des Zylinderrohres zugewandten Seite des Führungsteiles, symmetrisch zur Symmetrieebene des Dichtbandes, zwei elastisch bewegliche Dichtlippen verbunden sind, die mit gegebenenfalls vertieft im Zylinderrohr angeordneten Dichtflächen der Zy-1inderrohrwand zusammenwirken. Diese Dichtlippen sind mit Vorteil an ihrer Wurzel beweglich an dem Führungsteil gehaltert und weisen von ihrer Wurzel weggerichtet eine keilförmig abnehmende Querschnittsgestalt auf. Dabei kann insbesondere bei größeren Zylinderdurchmessern die der Zylinderachse zugewandte Fläche des Dichtbandes die Innenumfangsgestait des Innenraumes des Zylinderrohres ergänzend ausgebildet seinThe sealing tape expediently has a guide part, which is supported on two bearing surfaces of the cylinder tube on both sides of the longitudinal slot and is laterally guided by radially arranged guide surfaces and on which the associated connecting element is arranged. In simple embodiments, this guide part in cooperation with the bearing surfaces can effect the entire seal, but an improvement in the sealing conditions can be achieved if the guide part on the side of the guide part facing the interior of the cylinder tube, symmetrically to the plane of symmetry of the sealing tape, has two elastically movable sealing lips are connected, which cooperate with sealing surfaces of the cylinder tube wall, which are arranged, if appropriate, recessed in the cylinder tube. These sealing lips are advantageously movably held at their roots on the guide part and have a wedge-shaped decreasing cross-sectional shape when directed away from their roots. In this case, in particular in the case of larger cylinder diameters, the surface of the sealing tape facing the cylinder axis can be designed to complement the inner circumferential surface of the interior of the cylinder tube

Um eine schonende, lediglich eine geringe Betätigungskraft erfordernde Trennung der Verbindungselemente bei der Bewegung des Kolbens zu erzielen, ist es zweckmäßig, wenn das Kräftübertragungselement ein in Zylinderrohrlängsrichtung beidseitig nach außen hin keilförmig verlaufendes Bandspreizteil aufweist, das zwischen dem Abdeck- und dem Dichtband liegt. Außerdem kann das Kraftübertragungselement in Zylinderrohrlängsrichtung beidseitig jeweils ein von außen auf das Abdeckband einwirkendes und dieses an die Zylinderrohraußenwand andrückendes Andrückglied aufweisen, das jeweils im Längenbereich des Kolbens angeordnet ist und im Zusammenwirken mit dem Kolben ― auf der bei einer Kolbenbewegung nachlaufenden Kolbenseite -die Verbindungselemente miteinander in Eingriff bringt.In order to achieve a gentle separation of the connecting elements, which requires only a small actuating force, during the movement of the piston, it is expedient if the force transmission element has a band-expanding part which extends in a wedge-shaped manner on both sides in the longitudinal direction of the cylinder tube and which lies between the cover and the sealing band. In addition, the force transmission element in the longitudinal direction of the cylinder tube can have a pressure element acting on the outside of the cover band from the outside and pressing it onto the cylinder tube outer wall, which is arranged in each case in the length region of the piston and in cooperation with the piston - on the piston side trailing during a piston movement - the connecting elements with one another engages.

Das Abdeckband und/oder das Dichtband können aus einem elastischen Kunststoffmaterial bestehen, dessen Eigenschaften im Hinblick auf die auftretenden mechanischen Beanspruchungen und das verwendete Druckmittel gewählt werden. Grundsätzlich ist es aber auch denkbar, alternativ gewebeverstärktes Gummimaterial oder dergleichen zu diesem Zwecke einzusetzen.The masking tape and / or the sealing tape can consist of an elastic plastic material, the properties of which are chosen with regard to the mechanical stresses occurring and the pressure medium used. In principle, however, it is also conceivable to alternatively use fabric-reinforced rubber material or the like for this purpose.

In der Zeichnung ist ein Ausführungsbeispiel des Gegenstandes der Erfindung dargestellt. Es zeigt

  • Fig. 1 einen Druckmittelzylinder gemäß der Erfindung, im axialen Schnitt, in einer Seitenansicht und in schematischer Darstellung;
  • Fig. 2 den Druckmittelzylinder nach Fig. 1, geschnitten längs der Linie 11-11 der Fig. 1, in perspektivischer Darstellung und im Ausschnitt, sowie in einem anderen Maßstab;
  • Fig. 3 den Druckmittelzylinder nach Fig. 1, geschnitten längs der Linie 111-111 der Fig. 1, in einer Seitenansicht, im Ausschnitt und in einem anderen Maßstab; und
  • Fig. 4 das Dichtband und das Abdeckband des Druckmittelzylinders nach Fig. 1, in einer perspektivischen Einzeldarstellung, in einem anderen Maßstab unter Veranschaulichung des Zusammenwirkens ihrer Verbindungsglieder.
In the drawing, an embodiment of the object of the invention is shown. It shows
  • Figure 1 shows a pressure medium cylinder according to the invention, in axial section, in a side view and in a schematic representation.
  • FIG. 2 shows the pressure medium cylinder according to FIG. 1, cut along the line 11-11 of FIG. 1, in perspective and in detail, and on a different scale;
  • 3 shows the pressure medium cylinder according to FIG. 1, cut along the line 111-111 of FIG. 1, in a side view, in a detail and on a different scale; and
  • Fig. 4, the sealing tape and the masking tape of the pressure medium cylinder according to Fig. 1, in a perspective view, on a different scale, illustrating the interaction of their connecting links.

Der in den Fig. 1 bis 3 dargestellte Druckmittelzylinder weist ein Zylinderrohr 1 auf, das einen Innenraum 2 in Gestalt einer exzentrisch angeordneten Zylinderbohrung enthält und mit einem durchgehenden Längsschlitz 3 ausgebildet ist. Das Zylinderrohr 1 ist an beiden Enden durch aufgesetzte Enddeckel 4 druckdicht verschlossen; in ihm ist ein Kolben 5 verschieblich geführt, der endseitig bei 6 und 7 jeweils eine Dichtmanschette trägt und damit gegen die Innenwand der Zylinderbohrung 2 abgedichtet ist. In dem Bereich zwischen den Dichtmanschetten 6, 7 ist der Kolben bei 8 mit verkleinertem Durchmesser ausgeführt. In diesem Bereich ist mit ihm ein Kraftübertragungselement 9 verschraubt, das einen mit seitlichem Spiel durch den Längsschlitz 3 nach außen geführten stegartigen Teil 10 aufweist, an den sich ein das Zylinderrohr 1 seitlich übergreifender Bügel 11 anschließt, auf welchem zwei im Abstand zueinander angeordnete parallele Flansche 12 sitzen, die zur Ankupplung des Kraftübertragungselementes 9 an eine nicht weiter dargestellte, von dem Druckmittelzylinder betätigte Einrichtung dienen. Der eine im wesentlichen U-förmige Querschnittsgestalt aufweisende Bügel 11 ist im Bereiche seiner Schenkel 13 mit zwei in entsprechende Längsnuten eingesetzten Führungsleisten 14 versehen, die mittels Stellschrauben 15 verstellbar und in entsprechenden Längsnuten 16 des Zylinderrohres 1 verschieblich geführt sind. Die beiden Schenkel 13 können in einer alternativen Ausführungsform auch nach unten zu verlängert sein, wie dies in Fig. 2 bei 17 angedeutet ist, und zusätzliche Führungsleisten 14a tragen, die mit entsprechenden Längsnuten 16a zusammenwirken. Die Führungsleisten 14 (und gegebenenfalls 14a) ergeben eine Parallelführung für das Kraftübertragungselement 9 und verhindern gleichzeitig ein Aufweiten des Zylinderrohres 1 im Bereiche des Längsschlitzes 3.The pressure medium cylinder shown in FIGS. 1 to 3 has a cylinder tube 1 which contains an interior 2 in the form of an eccentrically arranged cylinder bore and is formed with a continuous longitudinal slot 3. The cylinder tube 1 is pressure-tightly closed at both ends by end caps 4; in it a piston 5 is displaceably guided, which carries a sealing collar at each end at 6 and 7 and is thus sealed against the inner wall of the cylinder bore 2. In the area between the sealing sleeves 6, 7, the piston is designed at 8 with a reduced diameter. In this area, a force transmission element 9 is screwed to it, which has a web-like part 10 which leads outwards through the longitudinal slot 3 to the side and to which a bracket 11, which laterally overlaps the cylinder tube 1, is connected, on which two parallel flanges arranged at a distance from one another 12 sit, which are used to couple the power transmission element 9 to a device, not shown, actuated by the pressure medium cylinder. The bracket 11, which has an essentially U-shaped cross-sectional shape, is provided in the region of its legs 13 with two guide strips 14 inserted into corresponding longitudinal grooves, which are adjustable by means of set screws 15 and are displaceably guided in corresponding longitudinal grooves 16 of the cylinder tube 1. In an alternative embodiment, the two legs 13 can also be extended downwards, as indicated at 17 in FIG. 2, and carry additional guide strips 14a which cooperate with corresponding longitudinal grooves 16a. The guide strips 14 (and possibly 14a) result in a parallel guide for the force transmission element 9 and at the same time prevent the cylinder tube 1 from expanding in the region of the longitudinal slot 3.

In dem Zylinderinnenraum 2 ist ein aus einem flexiblen elastischen Kunststoffmaterial bestehendes Dichtband 18 angeordnet, das endseitig in den beiden Enddeckeln 4 verankert ist. Das Dichtband 18 dient zur Abdichtung des Längsschlitzes im Bereiche der zwischen dem Kolben 5 und den beiden Enddeckeln 4 befindlichen Druckräume 19, 20 und des Druckmittelzylinders und verläuft über die gesamte Länge des Zylinderrohres 1. Wie insbesondere aus den Fig. 3, 4 zu ersehen, weist das Dichtband 18 ein Basis- oder Führungsteil 21 von im wesentlichen rechteckiger Querschnittsgestalt auf, das sich beidseitig des Längsschlitzes 3 jeweils auf eine ebene, am Grunde einer Längsnut angeordnete Auflagefläche 22 auflegen kann und seitlich von zwei von den Nutseitenwänden gebildeten Führungsflächen 23 geführt ist. An der dem Zylinderinnenraum 2 zugewandten Seite sind an dem Führungsteil zwei im Querschnitt spitzwinklig zulaufende und keilförmige elastische Dichtlippen 24 angeordnet, die an ihrer Wurzel - bei 250 - beweglich den Führungsteil 21 angeformt sind. Die Dichtlippen 24 legen sich gegen zugeordnete, in die Wandung des Zylinderinnenraumes 2 eingearbeitete Dichtflächen 25 an, wobei die Anordnung derart getroffen ist, daß das Dichtband 18 in der insbesondere aus Fig. 3 ersichtlichen Weise den Umriß des Zylinderinnenraumes 2 lückenlos ergänzt.Arranged in the cylinder interior 2 is a sealing tape 18 consisting of a flexible, elastic plastic material, which is anchored at the ends in the two end caps 4. The sealing tape 18 serves to seal the longitudinal slot in the area of the pressure chambers 19, 20 between the piston 5 and the two end caps 4 and the pressure medium cylinder and extends over the entire length of the cylinder tube 1. As can be seen in particular from FIGS. 3, 4, the sealing tape 18 has a base or guide part 21 of essentially rectangular cross-sectional shape, which can rest on both sides of the longitudinal slot 3 on a flat bearing surface 22 arranged at the bottom of a longitudinal groove and is guided laterally by two guide surfaces 23 formed by the groove side walls. On the side facing the cylinder interior 2, two wedge-shaped elastic sealing lips 24 with an acute angle in cross-section are arranged on the guide part, and at their roots - at 250 - the guide part 21 is formed so as to be movable. The sealing lips 24 bear against associated sealing surfaces 25 incorporated into the wall of the cylinder interior 2, the arrangement being such that the sealing tape 18 complements the outline of the cylinder interior 2 without gaps in the manner shown in FIG. 3 in particular.

Auf der Oberseite des Führungsteiles 21 trägt das Dichtband 18 einen ein Verbindungselement bildenden angeformten Mittelsteg 26, der in den Längsschlitz 3 ragt und symmetrisch zu diesem angeordnet ist. Auf der Außenseite des Zylinderrohres 1 ist der Längsschlitz 3 durch ein aus einem flexiblen elastischen Kunststoffmaterial bestehendes biegsames Abdeckband 27 abgedeckt, das sich ebenfalls über die Länge des Zylinderrohres 1 erstreckt und an beiden Enden in den Enddeckeln 4 verankert ist. Das Abdeckband 27 ist im Querschnitt etwa rechteckig ausgebildet und liegt in einer entsprechenden Längsnut 28 des Zylinderrohres 1, von deren Boden aus sich der Längsschlitz 3 öffnet. An dem Abdeckband 27 ist ein zweites Verbindungselement in Gestalt einer von zwei angeformten parallelen Schenkeln 29 begrenzten Längsnut 30 angeordnet, die eine im Querschnitt im wesentlichen U-förmige Gestalt aufweist und sich ebenso wie der Steg 26 über die gesamte Länge des Abdeckbandes 27 bzw. des Dichtbandes 18 erstreckt.On the upper side of the guide part 21, the sealing tape 18 carries a molded central web 26 forming a connecting element, which projects into the longitudinal slot 3 and is arranged symmetrically to the latter. On the outside of the cylinder tube 1, the longitudinal slot 3 is covered by a flexible cover band 27 consisting of a flexible elastic plastic material, which also extends over the length of the cylinder tube 1 and is anchored in the end caps 4 at both ends. The cover band 27 is approximately rectangular in cross section and lies in a corresponding longitudinal groove 28 of the cylinder tube 1, from the bottom of which the longitudinal slot 3 opens. On the cover band 27, a second connecting element is arranged in the form of a longitudinal groove 30 delimited by two molded-on parallel legs 29, which has a substantially U-shaped cross section and, like the web 26, extends over the entire length of the cover band 27 or Sealing tape 18 extends.

Der Steg 26 ist an seiner Wurzel mit einem parallel- und geradflankigen Teil 31 ausgebildet, an den sich ein nach außen zu sich erweiternder keilförmiger Teil 32 anschließt, auf welchen ein konvergierender, im vorliegenden Fall im Querschnitt etwa trapezförmiger, aber gegebenenfalls auch abgerundeter Einführungsteil 33 folgt. In entsprechender Weise tragen die die Längsnut 30 begrenzenden Schenkel 29 auf ihrer Innenseite keilförmige Teile 34, die einander gegenüberliegen und zu der Nutöffnung hin konvergieren.The web 26 is formed at its root with a parallel and straight-flanked part 31, which is adjoined by a wedge-shaped part 32 that widens outwards, on which a converging insertion part 33, which in the present case is approximately trapezoidal in cross section, but possibly also rounded follows. Correspondingly, they wear the longitudinal groove 30 delimiting legs 29 on their inside wedge-shaped parts 34 which lie opposite each other and converge towards the groove opening.

Die Anordnung ist dabei derart getroffen, daß der Steg 26 in der aus Fig. 4 zu entnehmenden Weise unter elastischem seitlichen Zurückwei chen der Schenkel 29 des Abdeckbandes 27 fortlaufend in die Längsnut 30 eingedrückt werden kann, womit sich eine feste Verbindung zwischen dem Abdeckband 27 und dem Dichtband 18 ergibt, da die Keilflächen 34,32 im zusammengefügten Zustand der Verbindungselemente einander hintergreifen und eine formschlüssige Verbindung herstellen. Das angeschrägte Einführungsteil 33 erleichtert hierbei das Einführen des Steges 26 in die Längsnut 30, während die geradflankigen Teile 31 und 34a gewährleisten, daß die keilförmigen Teile 32, 34 einwandfrei aneinander zur Anlage kommen können.The arrangement is such that the web 26 in the manner shown in FIG. 4 with elastic lateral Rückwei chen the leg 29 of the cover tape 27 can be pressed continuously into the longitudinal groove 30, whereby a firm connection between the cover tape 27 and results in the sealing tape 18, since the wedge surfaces 34, 32 engage behind one another in the assembled state of the connecting elements and produce a positive connection. The bevelled insertion part 33 facilitates the insertion of the web 26 into the longitudinal groove 30, while the straight-sided parts 31 and 34a ensure that the wedge-shaped parts 32, 34 can come into contact with one another without any problems.

Anstelle eines Steges 26 und einer einzigen diesem zugeordneten Längsnut 30 könnten naturgemäß in einer nicht weiter dargestellten anderen Ausführungsform auch mehrere parallel zueinander angeordnete Stege und Längsnuten vorgesehen sein, wie es auch denkbar wäre, den Steg 26 an dem Abdeckband 27 und die Längsnut 30 statt dessen an dem Dichtband 18 vorzusehen.Instead of a web 26 and a single longitudinal groove 30 associated therewith, a plurality of webs and longitudinal grooves arranged parallel to one another could of course also be provided in another embodiment, not shown, as would also be conceivable for the web 26 on the cover band 27 and the longitudinal groove 30 instead to provide on the sealing tape 18.

Das Dichtband 18 ist durch eine Öffnung 35 (Fig. 1, 2) unter dem Kraftübertragungselement 9 hindurchgeführt, das ein im Bereiche des Kolbenteiles 8 angeordnetes, in Zylinderrohrlängsrichtung beidseitig keilförmig verlaufendes Bandspreizteil 36 aufweist, über dessen Oberseite das Abdeckband 27 geführt ist, derart, daß das Bandspreizteil 36 zwischen den beiden Bändern 18, 27 liegt. Außerdem trägt das Kraftübertragungselement 9 im Bereiche seiner beiden Enden jeweils ein auf das Abdeckband 27 einwirkendes und dieses an die Zylinderrohrwand andrückendes, nach Art einer Rolle ausgebildetes Andrückglied 37, das - wie aus Fig. 1 zu ersehen - jeweils im wesentlichen oberhalb des die Manschette 6 bzw. 7 tragenden Kolbenteiles angeordnet ist.The sealing tape 18 is passed through an opening 35 (FIGS. 1, 2) under the force transmission element 9, which has a tape expansion part 36 which is arranged in the region of the piston part 8 and extends in a wedge-shaped manner on both sides in the longitudinal direction of the cylinder tube, over the top of which the cover tape 27 is guided, that the band expansion part 36 lies between the two bands 18, 27. In addition, the force transmission element 9 carries, in the region of its two ends, a pressure element 37 which acts on the cover band 27 and presses it against the cylinder tube wall, in the manner of a roller, which - as can be seen from FIG. 1 - is essentially above the sleeve 6 or 7 supporting piston part is arranged.

Im Bereiche der beiden beidseitig des Kolbens 5 liegenden Druckräume 19, 20 sind die von dem Steg 26 und der Längsnut 30 gebildeten Verbindungsglieder in der aus Fig. 3 ersichtlichen Weise miteinander im Eingriff, so daß das Dichtband 18 von dem Abdeckband 27 durch den Längsschlitz 3 hindurch an den Auflageflächen 22 und den Dichtflächen 25 in Anlage gehalten ist. Wird der Kolben 5, ausgehend von der Stellung nach Fig. 1, beispielsweise nach links verschoben, so spreizt das keilförmige Bandspreizteil 36 das Abdeckband 27 und das Dichtband 18 in dem hinter der Dichtmanschette 6 liegenden drucklosen Raum des Kolbens 5 auseinander, wodurch der Steg 26 fortlaufend aus der Längsnut 30 herausbewegt wird, deren Schenkel 29 dabei seitlich elastisch zurückweichen (vergl. Fig. 4). Dabei verhindern das die Dichtmanschette 6 tragende Kolbenteil und das linke Andrückteil 37, daß die beschriebene Trennung der von dem Steg 26 und der Längsnut 30 gebildeten Verbindungsglieder der beiden Bänder 18, 27 sich bis in den Druckraum 19 fortpflanzt.In the area of the two pressure chambers 19, 20 located on both sides of the piston 5, the connecting members formed by the web 26 and the longitudinal groove 30 are engaged with one another in the manner shown in FIG. 3, so that the sealing tape 18 is removed from the cover tape 27 through the longitudinal slot 3 is held in contact with the bearing surfaces 22 and the sealing surfaces 25. If the piston 5, starting from the position shown in FIG. 1, is shifted to the left, for example, the wedge-shaped band expansion part 36 spreads the cover band 27 and the sealing band 18 apart in the pressure-free space of the piston 5 behind the sealing sleeve 6, as a result of which the web 26 is continuously moved out of the longitudinal groove 30, the legs 29 of which laterally move back elastically (cf. FIG. 4). The piston part carrying the sealing sleeve 6 and the left pressing part 37 prevent the described separation of the connecting members of the two bands 18, 27 formed by the web 26 and the longitudinal groove 30 from propagating into the pressure chamber 19.

Auf der anderen Kolbenseite (in Fig. 1 rechts) drücken bei der geschilderten Linksbewegung des Kolbens 5 das die Dichtmanschette 7 tragen de Kolbenteil und das rechte Andrückglied 37 den Steg 26 des Dichtbandes 18 fortlaufend in die Längsnut 30 des Abdeckbandes 27 ein, so daß der rechte Druckraum 20 stets einwandfrei abgedichtet ist.On the other side of the piston (on the right in FIG. 1), when the piston 5 moves to the left, the sealing sleeve 7 carries the piston part and the right pressing member 37 continuously engages the web 26 of the sealing tape 18 into the longitudinal groove 30 of the cover tape 27, so that the right pressure chamber 20 is always properly sealed.

Wird der Kolben 5, bezogen auf Fig. 1, nach rechts bewegt, so läuft der geschilderte Vorgang in der umgekehrten Richtung ab.If the piston 5, based on FIG. 1, is moved to the right, the process described proceeds in the opposite direction.

Der Druckmittelzylinder kann mit beliebigen gasförmigen oder flüssigen Druckmitteln betrieben werden.The pressure medium cylinder can be operated with any gaseous or liquid pressure medium.

Claims (12)

1. A pressure fluid cylinder comprising a longitudinally slotted cylinder tube (1) closed at its ends and enclosing a piston (5) provided therein in sealed relationship and for longitudinal displacement, which pistons carries a load transmission element (9) projecting outwardly through the longitudinal slot (3), the longitudinal slot (3) of the cylindrical tube (1) being sealed in the longitudinal direction of the cylinder by a sealing strip which is provided in the interior (2) of the cylinder tube, passes in the zone of the piston underneath the load transmission element (9) and is retained in contact, on both sides of the piston (5), with a sealing face (22,25) of the cylinder tube wall, and being covered on the outside of the cylinder tube by a flexible cover strip (27) passing in the zone of the load transmission element (9) over or through the latter and being retained on the outer cylinder wall on both sides of the load transmission element (9), characterized in that the sealing strip (18) is held by the cover strip (27) in contact with the associated sealing face (22, 25) on both sides of the piston (5), through coacting releasable connection elements (26, 30) passing through the longitudinal slots (3) and extending over the length of the strip and that the connection elements (26, 30) are continuously released, in response to the longitudinal movement of the piston (5), in front of that end of the piston which faces the diminishing cylinder space (19 or 20) and engaged on the opposite side of the piston.
2. A pressure fluid cylinder in accordance with claim 1, characterized in that the connection elements (26, 30) comprise at least one web (26) of profiled cross-section extending in the longitudinal direction of the cylinder and provided on the sealing strip (18) or the cover strip (27) in the radial direction of the cylinder tube (1), and an associated longitudinal groove (30) provided on the other strip (27 or 30), extending likewise in the longitudinal direction and exhibiting a profiled cross-section matching the cross-section of the web, the lateral walls (29) of the said groove being elastically expandable for receiving the web (26) between them.
3. A pressure fluid cylinder in accordance with claim 2, characterized in that the cross-section of the web (26) and the longitudinal groove (30) is at least partly wedge-shaped and tapers towards the cylinder axis and that the wedge-shaped portions (32, 34) of the web (26) and the longitudinal groove (30) engage behind each other.
4. A pressure fluid cylinder in accordance with claim 3, characterized in that the profiled cross-section of each of the longitudinal groove (30) and/or the web (26) exhibits, adjacent to the wedge-shaped portion (32, 34), a portion with substantially straight parallel flanks facing the respective strip (18 or 27) and extending radially to the cylinder tube (1
5. A pressure fluid cylinder in accordance with claim 3 or 4, characterized in that the web (26) carries a radially converging lead-in portion (33) on its free end directed radially to the cylinder tube (1) and facing away from the associated strip (18 or 27).
6. A pressure fluid cylinder in accordance with any of the preceding claims, characterized in that the sealing strip (18) comprises a guide portion (21) carrying the associated connection element (26 or 30), the guide portion being supported on two supporting faces (22) of the cylinder tube (1 on both sides of the longitudinal slot (3), and guided laterally by radially extending guide faces (23).
7. A pressure fluid cylinder in accordance with claim 6, characterized in that two elastic sealing lips (24) coacting with sealing faces (25) of the cylinder tube wall (1) that may be recessed in the into the cylinder tube (1), are connected with the guide portion (21) on the side of the guide portion facing the inside of the cylinder tube (1), and symmetrically to the plane of symmetry of the sealing strip (18).
8. A pressure fluid cylinder in accordance with claim 7, characterized in that the face of the sealing strip (18) facing the cylinder axis exhibits a shape complementing the inner circumferential shape of the interior of the cylinder tube (1).
9. A pressure fluid cylinder in accordance with claim 7 or 8, characterized in that the sealing lips (24) are retained movably by their bases on the guide portion (21) and exhibit a wedge-shaped cross-section pointing away from their bases (250).
10. A pressure fluid cylinder in accordance with any of the preceding claims, characterized in that the load transmission element (9) comprises a strip spreading element (36) arranged between the cover strip and the sealing strip (27, 18) and tapering on both sides in outward direction.
11. A pressure fluid cylinder in accordance with claim 10, characterized in that the load transmission element (9) comprises on each of its ends, viewed in the longitudinal direction of the cylinder tube, one pressing element (37) arranged within the length of the piston (5) and acting from the outside upon the cover strip (27) to press it against the outer cylinder wall.
12. A pressure fluid cylinder in accordance with any of the preceding claims, characterized in that the cover strip and/orthe sealing strip (27, 18) consist of an elastic plastic material.
EP82103075A 1981-06-25 1982-04-09 Fluid pressure actuator Expired EP0069199B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82103075T ATE10128T1 (en) 1981-06-25 1982-04-09 PRESSURE CYLINDER.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3124878 1981-06-25
DE3124878A DE3124878C1 (en) 1981-06-25 1981-06-25 Pressure cylinder

Publications (2)

Publication Number Publication Date
EP0069199A1 EP0069199A1 (en) 1983-01-12
EP0069199B1 true EP0069199B1 (en) 1984-10-31

Family

ID=6135303

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82103075A Expired EP0069199B1 (en) 1981-06-25 1982-04-09 Fluid pressure actuator

Country Status (5)

Country Link
EP (1) EP0069199B1 (en)
JP (2) JPS5850302A (en)
AT (1) ATE10128T1 (en)
DE (1) DE3124878C1 (en)
ZA (1) ZA823755B (en)

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Also Published As

Publication number Publication date
ZA823755B (en) 1983-03-30
JPS5850302A (en) 1983-03-24
JPS6216321B2 (en) 1987-04-11
JPS6367041B2 (en) 1988-12-23
JPS62155307A (en) 1987-07-10
ATE10128T1 (en) 1984-11-15
DE3124878C1 (en) 1982-12-09
EP0069199A1 (en) 1983-01-12

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