EP0113790B1 - Pressure cylinder with a longitudinally slotted barrel closed at both ends - Google Patents

Pressure cylinder with a longitudinally slotted barrel closed at both ends Download PDF

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Publication number
EP0113790B1
EP0113790B1 EP83100256A EP83100256A EP0113790B1 EP 0113790 B1 EP0113790 B1 EP 0113790B1 EP 83100256 A EP83100256 A EP 83100256A EP 83100256 A EP83100256 A EP 83100256A EP 0113790 B1 EP0113790 B1 EP 0113790B1
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EP
European Patent Office
Prior art keywords
piston
transmission element
pressure medium
force transmission
medium cylinder
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
EP83100256A
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German (de)
French (fr)
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EP0113790A1 (en
Inventor
Reinhard Lipinski
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
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Proma Produkt- und Marketing GmbH
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Filing date
Publication date
Application filed by Proma Produkt- und Marketing GmbH filed Critical Proma Produkt- und Marketing GmbH
Priority to DE8383100256T priority Critical patent/DE3370172D1/en
Priority to AT83100256T priority patent/ATE25869T1/en
Priority to EP83100256A priority patent/EP0113790B1/en
Priority to US06/563,028 priority patent/US4519297A/en
Priority to BR8400087A priority patent/BR8400087A/en
Priority to JP59003699A priority patent/JPS59137608A/en
Publication of EP0113790A1 publication Critical patent/EP0113790A1/en
Application granted granted Critical
Publication of EP0113790B1 publication Critical patent/EP0113790B1/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 a longitudinally slotted cylinder tube which is closed at the end, in which a sealed piston is guided so as to be longitudinally displaceable and the longitudinal slot of which is sealed on both sides of the piston by an internal flexible sealing tape which is located in a pressure-free area of the piston between two piston / cylinder seals a through the longitudinal slot outwardly projecting, directly connected to the piston force transmission element is passed, which is longitudinally guided by means of a bracket-like guide part partially encompassing the cylinder tube on at least two parallel guideways of an external parallel guide, the guideways on both sides of the longitudinal slot directly on the outside of the cylinder tube are arranged, wherein the piston has two piston parts arranged on both sides of the force transmission element and each carrying at least one piston / cylinder seal.
  • Such a pressure medium cylinder as described in EP-A 0068088, is characterized in that the force transmission element, depending on the respective application, can absorb transverse forces or moments that occur because the force transmission element is supported on the guideways.
  • the guide tracks lying on both sides of the longitudinal slot on the outside of the cylinder tube also prevent, in cooperation with the bow-like guide part which partially surrounds the cylinder tube, an undesirable widening of the longitudinal slot of the cylinder tube which occurs at high internal pressures.
  • the guidance of the force transmission element through the two parallel guideways of the external parallel guide must have a certain play for reasons of ease of movement. This means that the force transmission element can carry out a small limited tilting movement with respect to the cylinder tube axis under the action of transverse forces or moments, or also undergoes a certain elastic deformation under very high loads. Since the flexible sealing tape sealing the longitudinal slot, as mentioned at the outset, is lifted off the longitudinal slot in the unpressurized area between the two piston / cylinder seals, the two piston cylinder seals must have a certain axial minimum distance, which in turn means that the overall length of the piston does not have a certain minimum value can fall below.
  • each of the two trolleys is preceded by a spherical shell, which carries on its circumference the sealing collar which interacts with the cylinder bore inner wall and which on the piston by means of a clamping bolt about a transverse to the plane of curvature of the Cylinder pivot axis is pivotally mounted, which passes through the middle of the cylinder.
  • the force transmission element projecting outwards through the longitudinal cylinder slot is not guided laterally.
  • the piston must have a relatively large axial length with regard to the running gear. This means that when the force transmission element is loaded at right angles to the plane of curvature of the cylinder, in the region of the two spherical shells, for example in the direction of their pivot axes, there are also relatively large lateral deflections which have to be absorbed by the sealing sleeves.
  • the object of the invention is therefore to remedy this and to create a pressure medium cylinder with a longitudinally slotted cylinder tube which is closed at the ends and which is largely independent of the load-dependent slight tilting movements of the force transmission element or of small, operationally occurring deflections of the cylinder tube.
  • the pressure medium cylinder mentioned at the outset is characterized according to the invention in that the two piston parts are connected to the force transmission element in a radially movable manner on all sides.
  • the force transmission element is guided perfectly with very little play by means of the parallel guide on the outside of the cylinder tube.
  • the piston itself can achieve a tolerance compensation with respect to the inner wall of the cylinder tube and can always adjust itself so that no lateral forces are exerted on the piston / cylinder seals.
  • the piston is therefore self-centering. In the event of slight deflections in the cylinder tube, the curvature of the cylinder tube can change itself adjust without losing self-centering.
  • the longitudinal slot of the cylinder tube experiences a certain widening, albeit a very small one, but one that does exist, which leads to a corresponding change in shape of the cross section of the cylinder tube bore. Since the two piston parts are connected to the force transmission element so that they can move in a radially limited manner, the soft piston / cylinder seals can adapt to this change in shape without being hindered by a rigid piston.
  • the two piston parts each consist of plastic material.
  • the pins arranged on the two piston parts can be connected coaxially to one another; however, the arrangement can also be such that the two piston parts are connected to one another by an integral pin.
  • the axial coupling of the two piston parts with the force transmission element can be brought about in a simple manner in that the two piston parts are each axially supported via a shoulder against the force transmission element engaging between them.
  • the pin or the pin can be connected to the force transmission element via at least one transverse pin penetrating the receiving opening, the transverse pin running with appropriate play either through a corresponding transverse bore of the pin or pins, or arranged to engage in an open transverse groove of the associated pin is.
  • the pins or the pin can be positively connected to the piston part or the force transmission element via at least one coupling device with lugs of the other part engaging in corresponding recesses in one part.
  • the force transmission element is fork-shaped, at least in the area of the receiving opening, with two legs that laterally delimit the longitudinally slotted receiving opening, as a result of which manufacture and assembly are simplified, while the flexible sealing tape is guided directly through the receiving opening and is simply inserted laterally into the latter can.
  • the pressure medium cylinder shown in FIGS. 1, 2 has a cylinder tube 2 containing a cylindrical cylinder bore 1, the cylinder bore 1 of which is closed at the end by two covers 3 screwed to the cylinder tube 2.
  • One of the fastening screws is visible at 4 in FIG. 1.
  • a piston 5 is guided in a longitudinally displaceable manner in the cylinder bore 1 and is directly connected to a force transmission element 6, which is guided to the outside with a web-like part 7 through a longitudinal slot 8 of the cylinder tube 2.
  • the force transmission element 6 is provided with an integrally formed bracket-like part 9, which surrounds the cylinder tube 2 in part and has a substantially U-shaped cross-sectional shape, the two legs 10 of which each carry a guide strip 11 on their inside.
  • the guide strips 11 are guided on both sides of the longitudinal slot 8, directly on the outer wall of the cylinder tube 2, of parallel guide tracks 12 with a triangular cross section.
  • the guideways 12 are arranged in the area between the outer edge of the longitudinal slot 8 and the plane of symmetry, which contains the piston axis and runs at right angles to the longitudinal slot 8, which is indicated at 13.
  • the longitudinal slot 8 is sealed on both sides of the piston 5 by an internal, flexible sealing tape 14 which is anchored at the ends to the covers 3 and which is guided in the region of the piston 5 under the web-like part 7 of the force transmission element 6.
  • This range lies between two in the axial Distance from each other on the piston 5 arranged piston / cylinder seals in the form of soft sealing sleeves 15. It is depressurized, so that the longitudinal slot 8 can be opened in this area for the passage of the web-like part 7, as can be seen in FIG. 1, without loss of pressure medium .
  • the sealing tape 14 seals the longitudinal slot 8 on both sides of the piston 5, so that when a pressure medium, for example compressed air, is applied to the cylinder bore 1 via pressure medium channels 18 provided in the covers 3, the piston 5 executes a corresponding longitudinal movement in the cylinder bore 1 .
  • a pressure medium for example compressed air
  • the force transmission element 6 then has, on the web-like part 7, a fork-shaped part 20, the two legs of which laterally delimit a longitudinally slotted receiving opening 21, through which the sealing tape 14 is simultaneously passed.
  • the inner wall of the receiving opening 21 is partially cylindrical (Fig. 2); in the area of the sealing tape 14, it is provided with a groove-like depression which receives the sealing tape 14.
  • the piston 5 has two piston parts 22 arranged symmetrically on both sides of the fork-shaped part 20 of the force transmission element 6, each of which consists of plastic material.
  • a sealing sleeve 15 is inserted, while a frustoconical cross-section 24 adjoining the cylindrical section 23 ends in a shoulder 25, via which the respective piston part 22 axially against the fork-shaped part 20 of the Power transmission element 6 is supported.
  • the two piston parts 22 are each attached to the fork-shaped part 20 of the force transmission element 6 so as to be radially movable.
  • the arrangement in the embodiment according to FIGS. 1 to 3 is such that the two piston parts 22 each carry a coaxial projecting cylindrical pin 26 in the region of the shoulder 25, which with play in the partially cylindrical receiving opening 21 of the fork-shaped part 20 are plugged in.
  • the two piston parts 22 are axially connected to the fork-shaped part 20 by means of two transverse pins 27 which penetrate the receiving opening 21 and corresponding transverse bores 28 in the pin 26.
  • the arrangement is such that the two coaxial pins 26 of the piston parts 22 each carry an end piece in the form of an annular collar 30, while the optionally two-part fork-shaped part 20 with an annular groove 31 in the area of its two legs, into which the two ring collars 30 engage, so that together with the support of the shoulder 25 of the piston parts 22 on the fork-shaped part 20, a positive connection of the two piston parts 22 to the force transmission element 6 is achieved.
  • the already mentioned limited radial mobility of the two piston parts 22 is ensured by appropriate dimensioning of the annular groove 31 and the partially cylindrical receiving opening 21, as well as the diameter of the cylindrical pins 26.
  • the two piston parts 22 are connected to one another by a one-piece pin 26a integrally formed on both piston parts 22, which is connected to the fork-shaped part 20 by a cross pin 27 penetrating a transverse bore 28 in a manner which basically corresponds to the embodiment according to FIG of the force transmission element 6 is also connected in a radially limited manner.
  • the arrangement in the manner shown in FIG. 6 can also be made such that the two cylindrical pins 26 of the piston parts 22 are designed to be connectable to one another at the end.
  • one pin 26 carries, for example, a threaded connector 32, while the other pin 26 is provided with a corresponding threaded bore 33.
  • latching connection elements can also be used.
  • the two piston parts 22 are axially coupled to the bow-shaped part 20 by their ring shoulder 25 being supported laterally on the fork-shaped part 20, so that the pins 26 which are connected to one another act as tie rods.
  • the cross pin 27 could also be omitted in the embodiment according to FIG.
  • the cylindrical pins 26 of the two piston parts are each provided with a transverse groove 34 which is open at the edge and into which a transverse pin 35 penetrating the partially cylindrical receiving opening 21 of the fork-shaped part 20 engages.
  • a corresponding radial dimensioning of the individual parts - as in all of the illustrated embodiments of the pistons 5 - ensures a limited radial mobility of the piston parts 22 with respect to the fork-shaped part 20 and thus of the force transmission element 6.
  • the pins 26 are each provided on the piston parts 22.
  • the arrangement could also be reversed, in that laterally projecting coaxial pins are arranged on the force transmission element 6 in the cylinder bore 1, on which the piston parts with a corresponding receiving opening are then placed with limited radial play but axially immovable.
  • the piston parts 22 carrying the sealing sleeves 15 are mounted with limited radial movement with respect to the force transmission element 6, the piston parts 22 with their sealing sleeves 15 are self-centering in the cylinder bore 1, their setting not being impaired by tilting movements of the force transmission element which are possible within the tolerance range .
  • the piston parts 22 with their sealing sleeves 15 can adapt to the shape of the cylinder bore 1 without being hindered by rigid piston parts, which is particularly important if a long deflection occurs in a long cylinder tube 2 or the longitudinal slot 8 under the action of the pressure medium acting on the cylinder bore 1 experiences a certain small expansion.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Packages (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)

Abstract

To prevent distortion of the cylinder, and free running of the motion transfer element (6) thereon, in guide tracks (12) formed on the outside of the cylinder, the piston (5) is formed in two piston parts (22, 22') connected by a piston rod or pin (26, 26', 26a, 26a', 26b, 26b', 26c, 26c', 26d, 26d'), and the motion transfer element (6) is coupled to the piston rod or pin by a pair of fork-like portions (20) surrounding the pin and permitting limited radial movement. The pin or piston rod may be somewhat flexible, or made of flexible material, for example unitary with the piston parts (22, 22') and of plastic material, or may be made in two portions or parts (22, 22'; 22a, 22a' . . . ), each individually coupled to the fork-shaped element or merely retaining the fork-shaped element in position with end shoulders (25, 25') of the piston part axially engaging the fork-shaped element and hence transferring motion to the motion transmitting element (6).

Description

Die Erfindung betrifft einen Druckmittelzylinder mit einem längsgeschlitzten, endseitig verschlossenen Zylinderrohr, in dem ein abgedichteter Kolben längsverschieblich geführt ist und dessen Längsschlitz beidseitig des Kolbens durch ein innenliegendes biegsames Dichtband abgedichtet ist, das in einem zwischen zwei Kolben-/Zylinderdichtungen liegenden drucklosen Bereich des Kolbens unter einem durch den Längsschlitz nach aussen ragenden, mit dem Kolben unmittelbar verbundenen Kraftübertragungselement hindurchgeführt ist, das mittels eines das Zylinderrohr teilweise umgreifenden bügelartigen Führungsteiles auf wenigstens zwei parallelen Führungsbahnen einer aussenliegenden Parallelführung längsgeführt ist, deren Führungsbahnen zu beiden Seiten des Längsschlitzes unmittelbar auf der Aussenseite des Zylinderrohres angeordnet sind, wobei der Kolben zwei beidseitig des Kraftübertragungselementes angeordnete und jeweils wenigstens eine Kolben-/ Zylinderdichtung tragende Kolbenteile aufweist.The invention relates to a pressure medium cylinder with a longitudinally slotted cylinder tube which is closed at the end, in which a sealed piston is guided so as to be longitudinally displaceable and the longitudinal slot of which is sealed on both sides of the piston by an internal flexible sealing tape which is located in a pressure-free area of the piston between two piston / cylinder seals a through the longitudinal slot outwardly projecting, directly connected to the piston force transmission element is passed, which is longitudinally guided by means of a bracket-like guide part partially encompassing the cylinder tube on at least two parallel guideways of an external parallel guide, the guideways on both sides of the longitudinal slot directly on the outside of the cylinder tube are arranged, wherein the piston has two piston parts arranged on both sides of the force transmission element and each carrying at least one piston / cylinder seal.

Ein solcher Druckmittelzylinder, wie er in der EP-A 0068088 beschrieben ist, zeichnet sich dadurch aus, dass das Kraftübertragungselement, abhängig von dem jeweiligen Anwendungsfall, auftretende Querkräfte oder -momente aufnehmen kann, weil das Kraftübertragungselement auf den Führungsbahnen abgestützt ist. Die beidseitig des Längsschlitzes auf der der Aussenseite des Zylinderrohres liegenden Führungsbahnen beugen auch im Zusammenwirken mit dem das Zylinderrohr teilweise umgreifenden bügelartigen Führungsteil einer bei hohen Innendrücken auftretenden unerwünschten Aufweitung des Längsschlitzes des Zylinderrohres vor.Such a pressure medium cylinder, as described in EP-A 0068088, is characterized in that the force transmission element, depending on the respective application, can absorb transverse forces or moments that occur because the force transmission element is supported on the guideways. The guide tracks lying on both sides of the longitudinal slot on the outside of the cylinder tube also prevent, in cooperation with the bow-like guide part which partially surrounds the cylinder tube, an undesirable widening of the longitudinal slot of the cylinder tube which occurs at high internal pressures.

Die Führung des Kraftübertragungselementes durch die zwei parallelen Führungsbahnen der aussenliegenden Parallelführung muss aus Gründen der Leichtgängigkeit ein gewisses Spiel aufweisen. Das bedeutet, dass das Kraftübertragungselement unter der Einwirkung von Querkräften oder -momenten eine kleine begrenzte Kippbewegung bezüglich der Zylinderrohrachse ausführen kann oder bei sehr grossen Beanspruchungen auch eine gewisse elastische Verformung erleidet. Da das den Längsschlitz abdichtende biegsame Dichtband, wie eingangs erwähnt, in dem drucklosen Bereich zwischen den beiden Kolben/Zylinderdichtungen von dem Längsschlitz abgehoben ist, müssen die beiden Kolbenzylinderdichtungen einen gewissen axialen Mindestabstand aufweisen, was wiederum bedeutet, dass die Kolbenlänge insgesamt einen bestimmten Mindestwert nicht unterschreiten kann. Wenn somit das Kraftübertragungselement, hervorgerufen von der Belastung, eine kleine Kippbewegung ausführt, kann diese je nach ihrer Richtung zu einer verhältnismässig grossen radialen Auslenkung der Kolbenenden führen, die durch die in der Regel als Dichtmanschetten ausgebildeten Kolbenzylinderdichtungen aufgenommen werden muss. Solche auf die Dichtmanschetten wirkenden Seitenkräfte sind aber deshalb unerwünscht, weil sie zu einer ungleichmässigen Beanspruchung der Dichtmanschetten führen und deren Lebensdauer ungünstig beinflussen können.The guidance of the force transmission element through the two parallel guideways of the external parallel guide must have a certain play for reasons of ease of movement. This means that the force transmission element can carry out a small limited tilting movement with respect to the cylinder tube axis under the action of transverse forces or moments, or also undergoes a certain elastic deformation under very high loads. Since the flexible sealing tape sealing the longitudinal slot, as mentioned at the outset, is lifted off the longitudinal slot in the unpressurized area between the two piston / cylinder seals, the two piston cylinder seals must have a certain axial minimum distance, which in turn means that the overall length of the piston does not have a certain minimum value can fall below. Thus, if the force transmission element, caused by the load, executes a small tilting movement, depending on its direction, this can lead to a relatively large radial deflection of the piston ends, which has to be absorbed by the piston-cylinder seals, which are usually designed as sealing sleeves. However, such side forces acting on the sealing sleeves are undesirable because they lead to an uneven loading of the sealing sleeves and can adversely affect their service life.

Eine ungleichmässige seitliche Beanspruchung der Kolbenzylinderdichtungen des verhältnismässig langen Kolbens kann auch dadurch zustandekommen, dass bei einem langen Druckmittelzylinder das Zylinderrohr bei nicht genau ausgerichteter Lagerung etwas durchgebogen ist, was sich gelegentlich nicht vermeiden lässt.An uneven lateral stress on the piston cylinder seals of the relatively long piston can also result from the fact that with a long pressure medium cylinder, the cylinder tube is slightly bent when the bearing is not precisely aligned, which can occasionally not be avoided.

Bei einem aus der DE-A 2943506 bekannten Druckmittelzylinder mit längsgeschlitztem endseitig verschlossenem Zylinderrohr ist der Kolben beidseitig auf zwei Rollenfahrwerken gelagert, deren Rollen auf der Innenwand der Zylinderbohrung laufen. Um dem Kolben dabei das Durchfahren eines in einer Ebene gekrümmten Zylinderrohres zu gestatten, ist jedem der beiden Fahrwerke eine Kugelschale vorgeordnet, die an ihrem Umfang die mit der Zylinderbohrungsinnenwand zusammenwirkende Dichtmanschette trägt und die an dem Kolben mittels eines Spannbolzens um eine quer zu der Krümmungsebene des Zylinders verlaufende Schwenkachse verschwenkbar gelagert ist, welche mitten durch den Zylinder hindurchgeht. Das durch den Zylinderlängsschlitz nach aussen ragende Kraftübertragungselement ist nicht seitlich geführt. Ausserdem muss der Kolben mit Rücksicht auf die Fahrwerke eine verhältnismässig grosse axiale Länge aufweisen. Dies bedeutet, dass bei einer Beanspruchung des Kraftübertragungselementes rechtwinklig zur Krümmungsebene des Zylinders, im Bereich der beiden Kugelschalen, etwa in Richtung deren Schwenkachsen, auch verhältnismässig grosse seitliche Auslenkungen auftreten, die von den Dichtmanschetten aufgenommen werden müssen.In a pressure medium cylinder known from DE-A 2943506 with a longitudinally slotted cylinder tube which is closed at the ends, the piston is supported on both sides on two roller carriages, the rollers of which run on the inner wall of the cylinder bore. In order to allow the piston to pass through a cylinder tube curved in one plane, each of the two trolleys is preceded by a spherical shell, which carries on its circumference the sealing collar which interacts with the cylinder bore inner wall and which on the piston by means of a clamping bolt about a transverse to the plane of curvature of the Cylinder pivot axis is pivotally mounted, which passes through the middle of the cylinder. The force transmission element projecting outwards through the longitudinal cylinder slot is not guided laterally. In addition, the piston must have a relatively large axial length with regard to the running gear. This means that when the force transmission element is loaded at right angles to the plane of curvature of the cylinder, in the region of the two spherical shells, for example in the direction of their pivot axes, there are also relatively large lateral deflections which have to be absorbed by the sealing sleeves.

Aufgabe der Erfindung ist es deshalb, hier abzuhelfen und einen Druckmittelzylinder mit einem längsgeschlitzten, endseitig verschlossenen Zylinderrohr zu schaffen, der weitgehend unabhängig von belastungsabhängigen geringfügigen Kippbewegungen des Kraftübertragungselementes oder von kleinen, betriebsmässig auftretenden Durchbiegungen des Zylinderrohres ist.The object of the invention is therefore to remedy this and to create a pressure medium cylinder with a longitudinally slotted cylinder tube which is closed at the ends and which is largely independent of the load-dependent slight tilting movements of the force transmission element or of small, operationally occurring deflections of the cylinder tube.

Zur Lösung dieser Aufgabe ist der eingangs genannte Druckmittelzylinder erfindungsgemäss dadurch gekennzeichnet, dass die beiden Kolbenteile mit dem Kraftübertragungselement begrenzt allseitig radial beweglich verbunden sind.To achieve this object, the pressure medium cylinder mentioned at the outset is characterized according to the invention in that the two piston parts are connected to the force transmission element in a radially movable manner on all sides.

Bei diesem Druckmittelzylinder ist einerseits das Kraftübertragungselement mittels der Parallelführung auf der Aussenseite des Zylinderrohres mit sehr geringem Spiel einwandfrei geführt. Andererseits kann der Kolben selbst einen Toleranzausgleich bezüglich der Innenwandung des Zylinderrohres erzielen und sich stets so einstellen, dass keine seitlichen Kräfte auf die Kolben-/ Zylinderdichtungen ausgeübt werden. Der Kolben ist deshalb selbstzentrierend. Bei geringfügigen Durchbiegungen des Zylinderrohres kann er sich der Krümmung des Zylinderrohres selbsttätig anpassen, ohne seine Selbstzentrierung zu verlieren.In this pressure medium cylinder, on the one hand, the force transmission element is guided perfectly with very little play by means of the parallel guide on the outside of the cylinder tube. On the other hand, the piston itself can achieve a tolerance compensation with respect to the inner wall of the cylinder tube and can always adjust itself so that no lateral forces are exerted on the piston / cylinder seals. The piston is therefore self-centering. In the event of slight deflections in the cylinder tube, the curvature of the cylinder tube can change itself adjust without losing self-centering.

Unter der Wirkung der Druckmittelbeaufschlagung erfährt der Längsschlitz des Zylinderrohres eine wenn auch sehr kleine, so doch vorhandene gewisse Aufweitung, die zu einer entsprechenden Formänderung des Querschnitts der Zylinderrohrbohrung führt. Da die beiden Kolbenteile mit dem Kraftübertragungselement radial begrenzt beweglich verbunden sind, können sich die weichen Kolben-/Zylinderdichtungen dieser Formänderung anpassen, ohne dabei durch einen starren Kolben behindert zu sein.Under the effect of pressurizing the medium, the longitudinal slot of the cylinder tube experiences a certain widening, albeit a very small one, but one that does exist, which leads to a corresponding change in shape of the cross section of the cylinder tube bore. Since the two piston parts are connected to the force transmission element so that they can move in a radially limited manner, the soft piston / cylinder seals can adapt to this change in shape without being hindered by a rigid piston.

Die beiden Kolbenteile bestehen in einer bevorzugten Ausführungsform jeweils aus Kunststoffmaterial.In a preferred embodiment, the two piston parts each consist of plastic material.

Sehr einfache konstruktive Verhältnisse ergeben sich, wenn jedes der beiden Kolbenteile über einen axial sich erstreckenden Zapfen an diesem Kolbenteil oder dem Kraftübertragungselement, der mit allseitigem begrenztem radialem Spiel in eine zugeordnete, in Achsrichtung verlaufende Aufnahmeöffnung an diesem Kolbenteil bzw. dem Kraftübertragungselement ragt, mit dem Kraftübertragungselement axial unverschieblich gekuppelt ist.Very simple structural relationships result if each of the two piston parts projects with an axially extending pin on this piston part or the force transmission element, which with all-round limited radial play in an associated axial opening on this piston part or the force transmission element Power transmission element is axially immovably coupled.

Dabei können die an den beiden Kolbenteilen angeordneten Zapfen koaxial miteinander verbunden sein; die Anordnung kann aber auch derart getroffen sein, dass die beiden Kolbenteile durch einen einstückigen Zapfen miteinander verbunden sind.The pins arranged on the two piston parts can be connected coaxially to one another; however, the arrangement can also be such that the two piston parts are connected to one another by an integral pin.

Die axiale Kupplung der beiden Kolbenteile mit dem Kraftübertragungselement kann in einfacher Weise dadurch zustande gebracht werden, dass die beiden Kolbenteile jeweils über eine Schulter gegen das zwischen sie eingreifende Kraftübertragungselement axial abgestützt sind.The axial coupling of the two piston parts with the force transmission element can be brought about in a simple manner in that the two piston parts are each axially supported via a shoulder against the force transmission element engaging between them.

Im übrigen können die Zapfen bzw. kann der Zapfen über wenigstens einen die Aufnahmeöffnung durchdringenden Querstift mit dem Kraftübertragungselement verbunden sein, wobei der Querstift mit entsprechendem Spiel entweder durch eine entsprechende Querbohrung des oder der Zapfen verläuft, oder in eine randoffene Quernut des zugeordneten Zapfens eingreifend angeordnet ist.In addition, the pin or the pin can be connected to the force transmission element via at least one transverse pin penetrating the receiving opening, the transverse pin running with appropriate play either through a corresponding transverse bore of the pin or pins, or arranged to engage in an open transverse groove of the associated pin is.

Bei einer alternativen Ausführungsform können die Zapfen bzw. kann der Zapfen mit dem Kolbenteil oder dem Kraftübertragungselement über wenigstens eine Kupplungseinrichtung mit in entsprechende Ausnehmungen des einen Teiles eingreifenden Ansätzen des anderen Teiles formschlüssig verbunden sein.In an alternative embodiment, the pins or the pin can be positively connected to the piston part or the force transmission element via at least one coupling device with lugs of the other part engaging in corresponding recesses in one part.

Vorteilhaft ist es schliesslich auch, wenn das Kraftübertragungselement zumindest im Bereich der Aufnahmeöffnung gabelförmig mit zwei die längsgeschlitzte Aufnahmeöffnung seitlich begrenzenden Schenkeln ausgebildet ist, wodurch Herstellung und Montage vereinfacht werden, während das biegsame Dichtband direkt durch die Aufnahmeöffnung hindurchgeführt ist und in diese einfach seitlich eingeführt werden kann.Finally, it is also advantageous if the force transmission element is fork-shaped, at least in the area of the receiving opening, with two legs that laterally delimit the longitudinally slotted receiving opening, as a result of which manufacture and assembly are simplified, while the flexible sealing tape is guided directly through the receiving opening and is simply inserted laterally into the latter can.

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

  • Figur einen Druckmittelzylinder gemäss der Erfindung, im axialen Schnitt, in einer Seitenansicht und in einer Teildarstellung, unter Weglassung eines Teiles des Zylinderrohres, Figur 2 den Druckmittelzylinder nach Figur 1, geschnitten längs der Linie 11-11 der Figur 1, in einer Seitenansicht, Figur den Kolben des Druckmittelzylinders nach Figur 1, mit einem Teil des Kraftübertragungselementes, im axialen Schnitt, in einer Seitenansicht und im Ausschnitt. Figur4den Kolben für einen Druckmittelzylinder nach Figur 1, in einer anderen Ausführungsform, in einer Darstellung entsprechend Figur 3, Figur 5 den Kolben für eine Druckmittelzylinder nach Figur 1, in einer weiteren Ausführungsform, mit einem die beiden Kolbenteile miteinander verbindenden einstückigen Zapfen, in einer Darstellung entsprechend Figur 3, Figur 6 den Kolben für einen Druckmittelzylinder nach Figur 1, in einer anderen Ausführungsform, mit zwei miteinander verbindbaren Zapfen, in einer Darstellung entsprechend Figur 3, und Figur den Kolben eines Druckmittelzylinders nach Figur 1, in einer noch anderen Ausführungsform mit randoffenen Nuten der Zapfen der Kolbenteile, ebenfalls in einer Darstellung nach Figur. 3.
Exemplary embodiments of the subject matter of the invention are shown in the drawing. Show it:
  • Figure a pressure medium cylinder according to the invention, in axial section, in a side view and in a partial view, with the omission of part of the cylinder tube, Figure 2 shows the pressure medium cylinder according to Figure 1, cut along the line 11-11 of Figure 1, in a side view, Figure the piston of the pressure medium cylinder according to Figure 1, with a part of the power transmission element, in axial section, in a side view and in a section. 4 shows the piston for a pressure medium cylinder according to FIG. 1, in another embodiment, in a representation corresponding to FIG. 3, FIG. 5 shows the piston for a pressure medium cylinder according to FIG. 1, in a further embodiment, with a one-piece pin connecting the two piston parts to one another 3, FIG. 6 shows the piston for a pressure medium cylinder according to FIG. 1, in another embodiment, with two pins which can be connected to one another, in a representation corresponding to FIG. 3, and FIG. 6 shows the piston of a pressure medium cylinder according to FIG. 1, in yet another embodiment with open edges Grooves of the pins of the piston parts, also in a representation according to the figure. 3rd

Der in Fig. 1, 2 dargestellte Druckmittelzylinder weist ein eine zylindrische Zylinderbohrung 1 enthaltendes Zylinderrohr 2 auf, dessen Zylinderbohrung 1 endseitig durch zwei mit den Zylinderrohr 2 verschraubte Deckel 3 verschlossen ist. Von den Befestigungsschrauben ist eine bei 4 in Fig. 1 sichtbar.The pressure medium cylinder shown in FIGS. 1, 2 has a cylinder tube 2 containing a cylindrical cylinder bore 1, the cylinder bore 1 of which is closed at the end by two covers 3 screwed to the cylinder tube 2. One of the fastening screws is visible at 4 in FIG. 1.

In der Zylinderbohrung 1 ist ein Kolben 5 längsverschieblich geführt, der mit einem Kraftübertragungselement 6 unmittelbar verbunden ist, welches mit einem stegartigen Teil 7 durch einen Längsschlitz 8 des Zylinderrohres 2 nach aussen geführt ist. Das Kraftübertragungselement 6 ist mit einem angeformten, das Zylinderrohr 2 teilweise umgreifenden bügelartigen Teil 9 von im wesentlichen U-förmiger Querschnittsgestalt versehen, dessen beide Schenkel 10 auf ihrer Innenseite jeweils eine Führungsleiste 11 tragen. Die Führungsleisten 11 sind auf beidseitig des Längsschlitzes 8 unmittelbar auf der Aussenwand des Zylinderrohres 2 angeordneten, im Querschnitt dreiecksförmigen Führungsbahnen 12 einer Parallelführung geführt. Wie aus Fig. 2 zu ersehen, sind die Führungsbahnen 12 in dem Bereich zwischen der äusseren Berandung des Längsschlitzes 8 und der die Kolbenachse enthaltenden, rechtwinklig zu dem Längsschlitz 8 verlaufenden Symmetrieebene angeordnet, die bei 13 angedeutet ist.A piston 5 is guided in a longitudinally displaceable manner in the cylinder bore 1 and is directly connected to a force transmission element 6, which is guided to the outside with a web-like part 7 through a longitudinal slot 8 of the cylinder tube 2. The force transmission element 6 is provided with an integrally formed bracket-like part 9, which surrounds the cylinder tube 2 in part and has a substantially U-shaped cross-sectional shape, the two legs 10 of which each carry a guide strip 11 on their inside. The guide strips 11 are guided on both sides of the longitudinal slot 8, directly on the outer wall of the cylinder tube 2, of parallel guide tracks 12 with a triangular cross section. As can be seen from FIG. 2, the guideways 12 are arranged in the area between the outer edge of the longitudinal slot 8 and the plane of symmetry, which contains the piston axis and runs at right angles to the longitudinal slot 8, which is indicated at 13.

Der Längsschlitz 8 ist beidseitig des Kolbens 5 durch ein innenliegendes, biegsames Dichtband 14 abgedichtet, das endseitig an den Deckeln 3 verankert ist und das im Bereiche des Kolbens 5 unter dem stegartigen Teil 7 des Kraftübertragungselementes 6 hindurchgeführt ist.The longitudinal slot 8 is sealed on both sides of the piston 5 by an internal, flexible sealing tape 14 which is anchored at the ends to the covers 3 and which is guided in the region of the piston 5 under the web-like part 7 of the force transmission element 6.

Dieser Bereich liegt zwischen zwei im axialen Abstand voneinander an dem Kolben 5 angeordneten Kolben-/Zylinderdichtungen in Gestalt von weichen Dichtmanschetten 15. Er ist drucklos, so dass der Längsschlitz 8 in diesem Bereich für den Durchtritt des stegartigen Teiles 7, wie aus Fig. 1 ersichtlich, ohne Druckmittelverlust geöffnet werden kann.This range lies between two in the axial Distance from each other on the piston 5 arranged piston / cylinder seals in the form of soft sealing sleeves 15. It is depressurized, so that the longitudinal slot 8 can be opened in this area for the passage of the web-like part 7, as can be seen in FIG. 1, without loss of pressure medium .

Auf dem Zylinderrohr 2 liegt im Bereiche des Längsschlitzes 8 ein ebenfalls endseitig an den Deckeln 3 verankertes biegsames Abdeckband 16 auf, das durch eine Öffnung 17 des Kraftübertragungselementes 6 hindurchgeführt ist und das eine in der Zeichnung nicht weiter dargestellte, im Querschnitt keilförmig profilierte randoffene Längsnut aufweist, die mit einem an dem Dichtband 14 angeformten, im Querschnitt im wesentlichen keilförmigen Steg zusammenwirkt, der in den Längsschlitz 8 ragt.On the cylinder tube 2, in the area of the longitudinal slot 8, there is a flexible cover band 16, which is also anchored at the ends to the covers 3, which is guided through an opening 17 of the force transmission element 6 and which has an open-edged longitudinal groove which is not shown in the drawing and has a wedge-shaped profile in cross section which cooperates with a web which is integrally formed on the sealing tape 14 and which is essentially wedge-shaped in cross section and projects into the longitudinal slot 8.

Das Dichtband 14 dichtet den Längsschlitz 8 beidseitig des Kolbens 5 ab, so dass, wenn die Zylinderbohrung 1 über in den Deckeln 3 vorgesehene Druckmittelkanäle 18 mit einem Druckmittel, bspw. Druckluft, beaufschlagt wird, der Kolben 5 in der Zylinderbohrung 1 eine entsprechende Längsbewegung ausführt.The sealing tape 14 seals the longitudinal slot 8 on both sides of the piston 5, so that when a pressure medium, for example compressed air, is applied to the cylinder bore 1 via pressure medium channels 18 provided in the covers 3, the piston 5 executes a corresponding longitudinal movement in the cylinder bore 1 .

Das Kraftübertragungselement 6 weist anschliessend an das stegartige Teil 7 ein gabelförmiges Teil 20 auf, dessen beide Schenkel eine längsgeschlitzte Aufnahmeöffnung 21 seitlich begrenzen, durch welche gleichzeitig das Dichtband 14 hindurchgeführt ist. Die Innenwandung der Aufnahmeöffnung 21 ist teilweise zylindrisch ausgebildet (Fig. 2); im Bereiche des Dichtbandes 14 ist sie mit einer nutartigen Vertiefung versehen, die das Dichtband 14 aufnimmt.The force transmission element 6 then has, on the web-like part 7, a fork-shaped part 20, the two legs of which laterally delimit a longitudinally slotted receiving opening 21, through which the sealing tape 14 is simultaneously passed. The inner wall of the receiving opening 21 is partially cylindrical (Fig. 2); in the area of the sealing tape 14, it is provided with a groove-like depression which receives the sealing tape 14.

Der Kolben 5 weist zwei beidseitig des gabelförmigen Teiles 20 des Kraftübertragungselementes 6 symmetrisch angeordnete Kolbenteile 22 auf, die jeweils aus Kunststoffmaterial bestehen. In eine stirnseitige Nut eines zylindrischen Abschnittes 23 jedes der Kolbenteile 22 ist eine bereits erwähnte Dichtmanschette 15 eingesetzt, während ein an den zylinderförmigen Abschnitt 23 anschliessender kegelstumpfförmiger Querschnitt 24 in einer Schulter 25 endet, über die das jeweilige Kolbenteil 22 axial gegen das gabelförmige Teil 20 des Kraftübertragungselementes 6 abgestützt ist. Eine in jedem der Kolbenteile 22 axial mündende einseitig verschlossene Dämpfungsbohrung 250 wirkt in der Endstellung des Kolbens in der aus Fig. 1 ersichtlichen Weise jeweils mit einem Dämpfungsrohr 260 zusammen.The piston 5 has two piston parts 22 arranged symmetrically on both sides of the fork-shaped part 20 of the force transmission element 6, each of which consists of plastic material. In an end groove of a cylindrical section 23 of each of the piston parts 22, a sealing sleeve 15 is inserted, while a frustoconical cross-section 24 adjoining the cylindrical section 23 ends in a shoulder 25, via which the respective piston part 22 axially against the fork-shaped part 20 of the Power transmission element 6 is supported. A damping bore 250, axially opening in each of the piston parts 22, which is closed on one side, cooperates with a damping tube 260 in the end position of the piston in the manner shown in FIG. 1.

Die beiden Kolbenteile 22 sind an dem gabelförmigen Teil 20 des Kraftübertragungselementes 6 jeweils radial begrenzt beweglich befestigt.The two piston parts 22 are each attached to the fork-shaped part 20 of the force transmission element 6 so as to be radially movable.

Zu diesem Zwecke ist bei der Ausführungsform nach den Fig. 1 bis 3 die Anordnung derart getroffen, dass die beiden Kolbenteile 22 im Bereiche der Schulter 25 jeweils einen koaxialen vorstehenden zylindrischen Zapfen 26 tragen, der mit Spiel in die teilzylindrische Aufnahmeöffnung 21 des gabelförmigen Teiles 20 eingesteckt sind. Die axiale Verbindung der beiden Kolbenteile 22 mit dem gabelförmigen Teil 20 erfolgt durch zwei Querstifte 27, die die Aufnahmeöffnung 21 und entsprechende Querbohrungen 28 in den Zapfen 26 durchdringen.For this purpose, the arrangement in the embodiment according to FIGS. 1 to 3 is such that the two piston parts 22 each carry a coaxial projecting cylindrical pin 26 in the region of the shoulder 25, which with play in the partially cylindrical receiving opening 21 of the fork-shaped part 20 are plugged in. The two piston parts 22 are axially connected to the fork-shaped part 20 by means of two transverse pins 27 which penetrate the receiving opening 21 and corresponding transverse bores 28 in the pin 26.

Bei der in Fig. 4 dargestellten Ausführungsform des Kolbens 5 ist die Anordnung derart getroffen, dass die beiden koaxialen Zapfen 26 der Kolbenteile 22 endseitig jeweils einen Ansatz in Gestalt eines Ringbundes 30 tragen, während das gegebenenfalls zweiteilige gabelförmige Teil 20 mit einer Ringnut 31 im Bereiche seiner beiden Schenkel versehen ist, in die die beiden Ringbünde 30 eingreifen, so dass gemeinsam mit der Abstützung der Schulter 25 der Kolbenteile 22 an dem gabelförmigen Teil 20 eine formschlüssige Verbindung der beiden Kolbenteile 22 mit dem Kraftübertragungselement 6 zustande kommt. Durch entsprechende Bemessung der Ringnut 31 und der teilzylindrischen Aufnahmeöffnung 21, wie auch des Durchmessers der zylindrischen Zapfen 26, wird die bereits erwähnte begrenzte radiale Beweglichkeit der beiden Kolbenteile 22 gewährleistet.In the embodiment of the piston 5 shown in FIG. 4, the arrangement is such that the two coaxial pins 26 of the piston parts 22 each carry an end piece in the form of an annular collar 30, while the optionally two-part fork-shaped part 20 with an annular groove 31 in the area of its two legs, into which the two ring collars 30 engage, so that together with the support of the shoulder 25 of the piston parts 22 on the fork-shaped part 20, a positive connection of the two piston parts 22 to the force transmission element 6 is achieved. The already mentioned limited radial mobility of the two piston parts 22 is ensured by appropriate dimensioning of the annular groove 31 and the partially cylindrical receiving opening 21, as well as the diameter of the cylindrical pins 26.

Bei der Ausführungsform nach Fig. sind die beiden Kolbenteile 22 durch einen einstückigen, an beide Kolbenteile 22 angeformten Zapfen 26a miteinander verbunden, der durch einen eine Querbohrung 28 durchdringenden Querstift 27 in einer grundsätzlich der Ausführungsform nach Fig. 3 entsprechenden Weise mit dem gabelförmigen Teil 20 des Kraftübertragungselementes 6 ebenfalls radial begrenzt beweglich verbunden ist.In the embodiment according to FIG. 2, the two piston parts 22 are connected to one another by a one-piece pin 26a integrally formed on both piston parts 22, which is connected to the fork-shaped part 20 by a cross pin 27 penetrating a transverse bore 28 in a manner which basically corresponds to the embodiment according to FIG of the force transmission element 6 is also connected in a radially limited manner.

Zur Erleichterung der Montage der beiden Kolbenteile 22 kann die Anordnung in der aus Fig. 6 ersichtlichen Weise auch derart getroffen sein, dass die beiden zylindrischen Zapfen 26 der Kolbenteile 22 stirnseitig miteinander verbindbar ausgebildet sind. Zu diesem Zwecke trägt der eine Zapfen 26 bspw. einen Gewindestutzen 32, während der andere Zapfen 26 mit einer entsprechenden Gewindebohrung 33 versehen ist.In order to facilitate the assembly of the two piston parts 22, the arrangement in the manner shown in FIG. 6 can also be made such that the two cylindrical pins 26 of the piston parts 22 are designed to be connectable to one another at the end. For this purpose, one pin 26 carries, for example, a threaded connector 32, while the other pin 26 is provided with a corresponding threaded bore 33.

Anstelle des Gewindestutzens 32 und der Gewindebohrung 33 können auch entsprechende Rastverbindungselemente verwendet werden.Instead of the threaded connector 32 and the threaded bore 33, corresponding latching connection elements can also be used.

Die beiden Kolbenteile 22 sind in diesem Falle an dem bügelförmigen Teil 20 dadurch axial angekuppelt, dass sie mit ihrer Ringschulter 25 sich seitlich an dem gabelförmigen Teil 20 abstützen, so dass die miteinander verbundenen Zapfen 26 als Zuganker wirken. Entsprechend könnte auch bei der Ausführungsform nach Fig.5 der Querstift 27 weggelassen werden.In this case, the two piston parts 22 are axially coupled to the bow-shaped part 20 by their ring shoulder 25 being supported laterally on the fork-shaped part 20, so that the pins 26 which are connected to one another act as tie rods. Correspondingly, the cross pin 27 could also be omitted in the embodiment according to FIG.

Bei der in Fig. 7 schliesslich dargestellten Ausführungsform des Kolbens 5 sind die zylindrischen Zapfen 26 der beiden Kolbenteile jeweils mit einer randoffenen Quernut 34 versehen, in die ein die teilzylindrische Aufnahmeöffnung 21 des gabelförmigen Teiles 20 durchdringender Querstift 35 eingreift. Auch hier ist durch entsprechende Bemessung der einzelnen Teile - wie bei allen dargestellten Ausführungsformen der Kolben 5 - eine begrenzte radiale Beweglichkeit der Kolbenteile 22 bezüglich des gabelförmigen Teiles 20 und damit des Kraftübertragungselementes 6 gewährleistet.In the embodiment of the piston 5 which is finally shown in FIG. 7, the cylindrical pins 26 of the two piston parts are each provided with a transverse groove 34 which is open at the edge and into which a transverse pin 35 penetrating the partially cylindrical receiving opening 21 of the fork-shaped part 20 engages. Here too, a corresponding radial dimensioning of the individual parts - as in all of the illustrated embodiments of the pistons 5 - ensures a limited radial mobility of the piston parts 22 with respect to the fork-shaped part 20 and thus of the force transmission element 6.

Bei den im Vorstehenden beschriebenen Ausführungsformen des Kolbens 5 sind die Zapfen 26 jeweils an den Kolbenteilen 22 vorgesehen. Grundsätzlich könnte die Anordnung auch umgekehrt getroffen sein, indem an dem Kraftübertragungselement 6 in der Zylinderbohrung 1 liegende, seitlich vorstehende koaxiale Zapfen angeordnet sind, auf die dann die eine entsprechende Aufnahmeöffnung aufweisenden Kolbenteile mit begrenztem radialen Spiel, aber axial unverschieblich, aufgesetzt sind.With the Aus described above leadership forms of the piston 5, the pins 26 are each provided on the piston parts 22. In principle, the arrangement could also be reversed, in that laterally projecting coaxial pins are arranged on the force transmission element 6 in the cylinder bore 1, on which the piston parts with a corresponding receiving opening are then placed with limited radial play but axially immovable.

Dadurch, dass die die Dichtmanschetten 15 tragenden Kolbenteile 22 bezüglich des Kraftübertragungselementes 6 begrenzt radial beweglich gelagert sind, sind die Kolbenteile 22 mit ihren Dichtmanschetten 15 in der Zylinderbohrung 1 selbstzentrierend, wobei ihre Einstellung durch im Rahmen des Toleranzbereiches mögliche Kippbewegungen des Kraftübertragungselementes nicht beeinträchtigt werden kann. Auch können die Kolbenteile 22 mit ihren Dichtmanschetten 15 sich der Form der Zylinderbohrung 1 ohne Behinderung durch starre Kolbenteile anpassen, was insbesondere dann von Bedeutung ist, wenn bei einem langen Zylinderrohr 2 eine gewisse Durchbiegung auftritt oder der Längsschlitz 8 unter der Einwirkung der Druckmittelbeaufschlagung der Zylinderbohrung 1 eine gewisse kleine Aufweitung erfährt.Due to the fact that the piston parts 22 carrying the sealing sleeves 15 are mounted with limited radial movement with respect to the force transmission element 6, the piston parts 22 with their sealing sleeves 15 are self-centering in the cylinder bore 1, their setting not being impaired by tilting movements of the force transmission element which are possible within the tolerance range . The piston parts 22 with their sealing sleeves 15 can adapt to the shape of the cylinder bore 1 without being hindered by rigid piston parts, which is particularly important if a long deflection occurs in a long cylinder tube 2 or the longitudinal slot 8 under the action of the pressure medium acting on the cylinder bore 1 experiences a certain small expansion.

Claims (11)

1. Pressure medium cylinder having a longitudinally slotted, terminally closed cylinder tube (2) in which a sealed piston (5) is longitudinally displaceably guided and the longitudinal slot (8) of which is sealed off on both sides of the piston (5) by an internally situated flexible sealing strip (14) which is conducted, in a pressureless region of the piston (5) lying between two piston/cylinder seals (15), through beneath a force-transmission element (6) protruding outwards through the longitudinal slot (8) and directly connected with the piston (5), which transmission element (6) is longitudinally guided by means of a bracket- type guide part (9) partially embracing the cylinder tube (2) on at least two parallel guide tracks (12) of an externally situated parallel guide, the guide tracks (12) of which are arranged to both sides of the longitudinal slot (8) directly on the outer wall of the cylinder tube (2), while the piston (5) comprises two piston parts (22) arranged on both sides of the force-transmission element (6) and each carrying at least one piston/cylinder seal (15), characterised in that the two piston parts (22) are connected limitedly radially moveably on all sides with the force-transmission element (6).
2. Pressure medium cylinder according to claim 1, characterised in that the two piston parts (22) each consist of synthetic plastics material.
3. Pressure medium cylinder according to one of the preceding claims, characterised in that each of the two piston parts (22) is axially non- displaceably coupled through an axially extending journal (26) to this piston part or the force transmission element (6), which journal extends with limited radial play on all sides into an associated, axially extending reception opening (21) on this piston part or the force transmission element.
4. Pressure medium cylinder according to claim 3, characterised in that the journals (26) arranged on the two piston parts (22) are coaxially connected with one another.
5. Pressure medium cylinder according to claim 1, characterised in that the two piston parts (22) are connected with one another by a one- piece journal (26a).
6. Pressure medium cylinder according to one of claims 3 to 5, characterised in that two piston parts (22) are axially supported each through a shoulder (25) against the force transmission element (6) engaging between them.
7. Pressure medium cylinder according to one of claims 3 to 6, characterised in that the journal or journals (26a; 26) is or are connected with the force transmission element (6) through at least one transverse pin (27) penetrating the reception opening (21) with play.
8. Pressure medium cylinder according to claim 7, characterised in that the transverse pin (35) is arranged engaging in an edge-open transverse groove (34) on the associated journal (26).
9. Pressure medium cylinder according to one of claims 3 to 6, characterised in that the journal or journals (26a; 26) is or are connected with the piston part (22) or the force transmission element (6) through at least one coupling device having protuberances (30) of the one part engaging in corresponding apertures (31) of the other part.
10. Pressure medium cylinder according to one of claims 3 to 9, characterised in that the force transmission element (6), in the region of the reception opening (21), is made in fork form with two prongs laterally limiting the longitudinally slotted reception opening (21
11. Pressure medium cylinder according to claim 10, characterised in that the sealing strip (14) is guided directly through the reception opening (21) of the force transmission element (6).
EP83100256A 1983-01-14 1983-01-14 Pressure cylinder with a longitudinally slotted barrel closed at both ends Expired EP0113790B1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
DE8383100256T DE3370172D1 (en) 1983-01-14 1983-01-14 Pressure cylinder with a longitudinally slotted barrel closed at both ends
AT83100256T ATE25869T1 (en) 1983-01-14 1983-01-14 PRESSURE MEDIA CYLINDER WITH A LONGITUDINALLY SLOTTED CYLINDER CLOSED AT THE END.
EP83100256A EP0113790B1 (en) 1983-01-14 1983-01-14 Pressure cylinder with a longitudinally slotted barrel closed at both ends
US06/563,028 US4519297A (en) 1983-01-14 1983-12-19 Sealed motion transfer apparatus utilizing a pressure fluid cylinder
BR8400087A BR8400087A (en) 1983-01-14 1984-01-09 SEALED MOVEMENT TRANSFER APPLIANCE
JP59003699A JPS59137608A (en) 1983-01-14 1984-01-13 Pressure medium cylinder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP83100256A EP0113790B1 (en) 1983-01-14 1983-01-14 Pressure cylinder with a longitudinally slotted barrel closed at both ends

Publications (2)

Publication Number Publication Date
EP0113790A1 EP0113790A1 (en) 1984-07-25
EP0113790B1 true EP0113790B1 (en) 1987-03-11

Family

ID=8190233

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83100256A Expired EP0113790B1 (en) 1983-01-14 1983-01-14 Pressure cylinder with a longitudinally slotted barrel closed at both ends

Country Status (6)

Country Link
US (1) US4519297A (en)
EP (1) EP0113790B1 (en)
JP (1) JPS59137608A (en)
AT (1) ATE25869T1 (en)
BR (1) BR8400087A (en)
DE (1) DE3370172D1 (en)

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Also Published As

Publication number Publication date
US4519297A (en) 1985-05-28
JPH0337043B2 (en) 1991-06-04
BR8400087A (en) 1984-08-21
ATE25869T1 (en) 1987-03-15
JPS59137608A (en) 1984-08-07
DE3370172D1 (en) 1987-04-16
EP0113790A1 (en) 1984-07-25

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