EP1225345B1 - Fluid actuated cylinder with gas spring - Google Patents

Fluid actuated cylinder with gas spring Download PDF

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Publication number
EP1225345B1
EP1225345B1 EP20020450006 EP02450006A EP1225345B1 EP 1225345 B1 EP1225345 B1 EP 1225345B1 EP 20020450006 EP20020450006 EP 20020450006 EP 02450006 A EP02450006 A EP 02450006A EP 1225345 B1 EP1225345 B1 EP 1225345B1
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EP
European Patent Office
Prior art keywords
working
sealing wall
cylinder
piston
piston rod
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP20020450006
Other languages
German (de)
French (fr)
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EP1225345A1 (en
Inventor
Gerhard Huber
Anita Moser
Klaus Schweiger
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.)
Hoerbiger Hydraulik GmbH
Original Assignee
Hoerbiger Hydraulik GmbH
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Publication of EP1225345A1 publication Critical patent/EP1225345A1/en
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Publication of EP1225345B1 publication Critical patent/EP1225345B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/06—Servomotor systems without provision for follow-up action; Circuits therefor involving features specific to the use of a compressible medium, e.g. air, steam
    • F15B11/064—Servomotor systems without provision for follow-up action; Circuits therefor involving features specific to the use of a compressible medium, e.g. air, steam with devices for saving the compressible medium
    • 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
    • F15B11/036—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force by means of servomotors having a plurality of working chambers
    • F15B11/0365—Tandem constructions
    • 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/06—Servomotor systems without provision for follow-up action; Circuits therefor involving features specific to the use of a compressible medium, e.g. air, steam
    • F15B11/072—Combined pneumatic-hydraulic systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1476—Special return means
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/625—Accumulators
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7053—Double-acting output members
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/77—Control of direction of movement of the output member
    • F15B2211/7716—Control of direction of movement of the output member with automatic return

Definitions

  • the invention relates to a working cylinder, with a cylinder tube, at least two sealing walls that are axially spaced and stationary relative to the cylinder tube, a working piston with at least one sealing wall and at least one working space defined and shifted between two sealing walls by means of a pressure fluid can be, which pressure fluid via at least one connection per work space can be supplied and discharged, and one connected to the working piston and through at least one working piston rod sealingly passed through, wherein the cylinder tube over at least one of the stationary sealing walls extended and added a movable component in the extended section is caused by a gas volume in the extended section of the cylinder tube is acted upon by a force and through a sealing wall of the work space the piston rod, which is passed through in a sealing manner, acts on the working piston.
  • typically hydraulic working cylinders are known, which by additionally or alone in at least one direction of movement be acted upon by gas springs.
  • actuation arrangement described with a hydraulic working cylinder on a Side is prestressed by means of gas pressure to the extent that it is pressurized with or allows the hydraulic working medium to flow out on the other Side retraction or an actuation movement takes place even under load.
  • JP 60 237207 A is a working cylinder of the type specified described, in which in one direction of work exerted by the pressure fluid Force on the working piston is supported by a force which is supported by an external one Volume of gas is produced. But this is self-sufficient and also the compactness is not given, which is desirable for many areas of application. moreover Even with this construction, the fact that gas springs are not taken into account have a certain amount of leakage over their service life, so that gas in the Flows into the cylinder chamber and here the filling pressure of the Counteracting pressure builds up. This also causes in the cylinder space inflowed gas an undesirable softness of the system that is not an exact Actuation, especially no exact stop and emergency stop function possible makes. The gas would also remove a certain amount of working fluid from the cylinder express what amount should be put in the tank, what makes tank ventilation indispensable, as well as larger dimensions of the tank.
  • the object of the present invention was therefore a simple one and self-sufficient working cylinder, which as stated at the beginning with opposite the cylinder inner wall completely tight, stationary sealing walls for the work rooms is provided and still the support of the working medium caused extension and / or extension movement of the working cylinder by a gas spring without the disadvantages mentioned above.
  • the working cylinder according to the invention characterized in that the gas volume is completely enclosed within the cylinder tube and that at least one vent opening between the gas volume and the sealing wall of the work area with the surroundings combines. So that a gas spring is the same in the working cylinder in a simple manner integrated so that external gas tanks and connections from the working cylinder there can be avoided. Furthermore, this is very simple and compact working cylinder coupled to the gas spring in a manner in which the Working spaces of the working cylinder from the gas volume of the gas spring through one into the Ventilated room are separated from which this is due to the leak the gas spring escaping gas can flow into the environment and not in the system of working fluid of the working cylinder can get.
  • the elongated cylinder tube through another fixed sealing wall is tightly closed that it goes beyond this further fixed sealing wall extended and by a bottom or stop for the gas spring piston is completed, the at least one vent opening from the sealing wall of the work area and the other fixed sealing wall Connects space with the environment.
  • a fully functional gas spring is in integrated the cylinder according to the invention in such a way that their leakage any negative influence on the hydraulic system is prevented.
  • This Construction also offers the possibility of the gas spring on the rod side to arrange the working cylinder.
  • a very low manufacturing effort and good properties regarding the sealing of the gas volume offers a further embodiment of the invention, if soft, between the other fixed sealing wall and the floor Slidable component alone a gas spring piston rod with essentially over the Total length of the same cross-section that can be moved between the sealing wall and the floor is.
  • constructions according to the invention are also possible, in which the working cylinder and gas spring have separate piston rods, i.e. the gas spring piston rod and the working piston rod are separate components.
  • the gas spring piston rod which is guided through a sealing wall in certain relative positions of the working piston and gas spring piston rest on the working piston and this with a force in one of its directions of movement apply.
  • the working cylinder is advantageous Double-acting and are connections for the pressure fluid on both Provided sides of the working piston, which makes the working cylinder for one is suitable for a greater number of possible uses and its training and / or Entry movement can be supported by at least one gas spring.
  • the construction of the working cylinder is particularly simple in one embodiment, in which the at least one ventilation opening is worked out in the cylinder tube is.
  • the further sealing wall on the working piston rod is advantageously opposite side of the working piston provided and preferably forms at the same time the bottom of the working cylinder.
  • FIG. 1 shows a working cylinder according to the invention with the bottom side Integrated gas spring with gas spring piston in longitudinal section
  • Fig. 2 shows one Longitudinal section through a working cylinder with gas spring on the rod side and in one piece Piston rod
  • Fig. 3 is a longitudinal section through a working cylinder with rod-side Gas spring, but separate piston rods
  • Fig. 4 shows one Longitudinal section through a working cylinder with gas spring and bottom one-piece piston rod, but without gas spring piston.
  • the preferably hydraulic working cylinder of FIG. 1 consists of a Cylinder tube 1, a bottom 2 and a cover 3.
  • the bottom 2 is used for articulation of the working cylinder at a first articulation point and points to this, for example a hole 4 on.
  • the cover 3 in turn forms a stop for the in the cylinder barrel 1 displaceably mounted working piston 5, with which a working piston rod 6 connected and led out sealed by the cover 3, which Piston rod 6 with its rod head 7 for connecting the working cylinder is provided with a second articulation point, for example also over a bore 4.
  • Between the bottom 2 and the working piston 5 is in the cylinder tube 1 a sealing wall 8 used sealing, which the actual working cylinder limited.
  • the working piston 5 is thus between the sealing wall 8 and the Cover 3 displaceable by the action of a hydraulic medium, which between the sealing wall 8, the working piston 5 and the cover 3 defined work spaces 9 is supplied via connections 10 or is derived therefrom.
  • gas spring piston 11 Fixed between the substantially in the longitudinal center of the cylinder tube 1 used sealing wall 8 and the also stationary base 2 of the working cylinder is a gas spring piston 11 slidably inserted, which by a between this gas spring piston 11 and the bottom 2 enclosed gas volume in Space 12 is applied and such a force in the direction of the extension of the working piston rod 6 exercises.
  • This force is generated by means of the gas spring piston 11 connected gas spring piston rod 13 on the working piston 5 or the working piston rod 6 transferred.
  • the gas spring piston rod 13 is sealing through the sealing wall 8 into the between the sealing wall 8 and the working piston 5 defined working space 9 of the working cylinder and pushes - at least in certain relative positions of working piston 5 and gas spring piston 11 - against the working piston 5 or the working piston rod 6.
  • FIG. 2 Another embodiment of a working cylinder according to the invention 2 shows.
  • the gas spring arrangement with the changes explained below on the rod side of the working cylinder provided.
  • the working spaces 9 of the working cylinder are between the floor 2 and one stationary sealing wall arranged in the central longitudinal region of the cylinder tube 1 8 defines the limits between which the working piston 5 can be displaced is led.
  • the working piston rod 6 is sealed by the sealing wall 8 passed and also through the cover 3 of the working cylinder, which Cover 3 but now only a fixed stop for the gas spring piston 11.
  • This gas spring piston 11 is fixed in place on the working piston rod 6, which in this case also represents and acts on the gas spring piston rod this working piston rod 6 with a force caused by the gas volume that is in a space 12 between the gas spring piston 11 and another, stationary sealing wall 16 is included.
  • the working and gas spring piston rod at the same time 6 is also sealingly passed through the further sealing wall 16, this sealing wall 16 somewhat from the first stationary sealing wall 8 is spaced. Between these sealing walls 8 and 16 is the surrounding area Defined via at least one opening 14 ventilated space 15, in which from the Escaping gas spring assembly arrives immediately. So there is no back pressure is built up to the effect of the gas spring arrangement when gas from the space 12 the gas spring assembly exits the gas spring piston 11 on the rod side is also the space 17 between the gas spring piston 11 and the cover 3 of the working cylinder connected to the surroundings by means of at least one vent opening 18.
  • FIG. 3 shows a working cylinder with a construction very similar to that of FIG. 2 Integrated gas spring, but now no one-piece piston rod for working cylinders and gas spring is present, but these two parts are separate parts.
  • the gas spring piston 11, which in turn is arranged on the rod side, is provided with a gas spring piston rod 13 connected, which through the cover 3, again as a stop acting for the gas spring piston 11, passed and with the rod head 7 is provided for articulation at an articulation point.
  • the actual controllable operating force on the rod head 7 is generated by the working piston 5, which between the bottom 2 and the first fixed middle sealing wall 8 is displaceable by a hydraulic medium.
  • the Movement of the working piston 5 is via the working piston rod connected to this piston 5 6 on the gas spring piston 11 or the gas spring piston rod 13 transferred, with the working piston rod sealing through the middle stationary sealing wall 8 and the further stationary sealing wall 16 is passed through.
  • FIG. 4 is again similar to FIG. 1 and has also has a gas spring on the bottom. However, it is not a gas spring piston 11 available, but the piston rod 6 over the piston 5 extended towards the bottom 2 so far that they seal through the stationary Sealing wall 8 and another stationary sealing wall 16 passed through can be and in the defined between floor 2 and another sealing wall 16 Room 12 protrudes.
  • This space 12 contains the gas volume, which is the end face the piston rod 6 with the hydraulic movement of the piston rod 6 supporting gas spring force.
  • the one between the two sealing walls 8 and 16 defined space is via at least one vent 14 with the Connected environment, so that gas emerging through the sealing wall 16 in the Environment can flow out and not into the hydraulic system of the working cylinder can reach.

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

Description

Die Erfindung betrifft einen Arbeitszylinder, mit einem Zylinderrohr, zumindest zwei axial beabstandeten und relativ zum Zylinderrohr ortsfesten Abdichtwänden, einem Arbeitskolben, der mit zumindest einer Abdichtwand zumindest einen Arbeitsraum definiert und mittels eines Druckfluids zwischen zwei Abdichtwänden verschoben werden kann, welches Druckfluid über zumindest je einen Anschluß pro Arbeitsraum zu- und abgeführt werden kann, und einer mit dem Arbeitskolben verbundenen und durch zumindest eine der Abdichtwände dichtend hindurchgeführte Arbeitskolbenstange, wobei das Zylinderrohr über zumindest eine der ortsfesten Abdichtwände hinaus verlängert und im verlängerten Abschnitt ein verschiebbarer Bauteil aufgenommen ist, der durch ein im verlängerten Abschnitt des Zylinderrohres Gasvolumen mit einer Kraft beaufschlagt ist und über eine durch eine Abdichtwand des Arbeitsraumes dichtend hindurchgeführte Kolbenstange auf den Arbeitskolben einwirkt.The invention relates to a working cylinder, with a cylinder tube, at least two sealing walls that are axially spaced and stationary relative to the cylinder tube, a working piston with at least one sealing wall and at least one working space defined and shifted between two sealing walls by means of a pressure fluid can be, which pressure fluid via at least one connection per work space can be supplied and discharged, and one connected to the working piston and through at least one working piston rod sealingly passed through, wherein the cylinder tube over at least one of the stationary sealing walls extended and added a movable component in the extended section is caused by a gas volume in the extended section of the cylinder tube is acted upon by a force and through a sealing wall of the work space the piston rod, which is passed through in a sealing manner, acts on the working piston.

Für viele Anwendungsfälle, insbesonders auch für die Betätigung von beweglichen Teilen an Fahrzeugen, beispielsweise von Verdeckteilen, Heckklappen, Türen, Verdeckraumklappen od.dgl., sind typischerweise hydraulische Arbeitszylinder bekannt, welche durch zumindest in einer Bewegungsrichtung zusätzlich oder allein durch Gasfedern beaufschlagt werden. So ist etwa in der AT 406.289 B eine Betätigungsanordnung mit einem hydraulischen Arbeitszylinder beschrieben, der auf einer Seite mittels Gasdruck soweit vorgespannt ist, dass durch Druckbeaufschlagung mit bzw. ermöglichtem Abströmen des hydraulischen Arbeitsmediums auf der anderen Seite ein Einfahren bzw. eine Betätigungsbewegung selbst unter Last erfolgt. Doch nicht nur auf einer Seite mit Hydraulikmedium beaufschlagte Arbeitszylinder sind bekannt, sondern auch doppeltwirkende Arbeitszylinder, bei welchen die Bewegung zumindest in einer Richtung durch eine Gasfeder unterstützt wird. Ein Beispiel dafür ist in der US 5,921,604 A offenbart, die ein hydraulisches Türöffnungssystem zum Gegenstand hat, bei welchem in manchen Ausführungsformen ein Arbeitszylinder zum Einsatz kommt, bei welchem eine Seite des doppeltwirkenden Arbeitszylinders durch eine verschiebbare Abdichtwand gebildet ist, die durch ein Gasvolumen mit einer Kraft beaufschlagt ist, welche den entsprechenden Arbeitsraum zu verkleinern trachtet.For many applications, especially for the actuation of moving ones Parts on vehicles, e.g. convertible top parts, tailgates, doors, Convertible top compartment flaps or the like, typically hydraulic working cylinders are known, which by additionally or alone in at least one direction of movement be acted upon by gas springs. In AT 406.289 B, for example, there is an actuation arrangement described with a hydraulic working cylinder on a Side is prestressed by means of gas pressure to the extent that it is pressurized with or allows the hydraulic working medium to flow out on the other Side retraction or an actuation movement takes place even under load. But Working cylinders loaded with hydraulic medium not only on one side are known, but also double-acting cylinders, in which the movement is supported at least in one direction by a gas spring. An example for is disclosed in US 5,921,604 A which discloses a hydraulic door opening system for Has subject, in which in some embodiments, a working cylinder is used in which one side of the double-acting working cylinder is formed by a displaceable sealing wall, which with a gas volume a force is applied which reduces the corresponding work space seeks.

In der JP 60 237207 A ist ein Arbeitszylinder der eingangs angegebenen Art beschrieben, bei welchem in einer Arbeitsrichtung die durch das Druckfluid ausgeübte Kraft auf den Arbeitskolben durch eine Kraft unterstützt wird, welche durch ein externes Gasvolumen hervorgerufen wird. Damit ist aber der autarke Einsatz und auch die Kompaktheit nicht gegeben, die für viele Einsatzgebiete erwünscht ist. Überdies ist auch bei dieser Konstruktion dem Umstand nicht Rechnung getragen, daß Gasfedern über ihre Lebensdauer eine gewisse Undichtheit aufweisen, so dass Gas in den Zylinderraum einströmt und hier in unerwünschter Weise einen dem Fülldruck des Arbeitsraumes entgegenwirkenden Druck aufbaut. Auch bewirkt das in den Zylinderraum eingeströmte Gas eine unerwünschte Weichheit des Systems, das keine exakte Betätigung, insbesonders keine exakte Stopp- und Nothaltefunktion mehr möglich macht. Das Gas würde auch eine bestimmte Menge an Arbeitsmedium aus dem Zylinder herausdrücken, welche Menge in den Tank aufgenommen werden müßte, was eine Tankentlüftung unabdingbar macht, ebenso wie eine größere Dimensionierung des Tanks.In JP 60 237207 A is a working cylinder of the type specified described, in which in one direction of work exerted by the pressure fluid Force on the working piston is supported by a force which is supported by an external one Volume of gas is produced. But this is self-sufficient and also the compactness is not given, which is desirable for many areas of application. moreover Even with this construction, the fact that gas springs are not taken into account have a certain amount of leakage over their service life, so that gas in the Flows into the cylinder chamber and here the filling pressure of the Counteracting pressure builds up. This also causes in the cylinder space inflowed gas an undesirable softness of the system that is not an exact Actuation, especially no exact stop and emergency stop function possible makes. The gas would also remove a certain amount of working fluid from the cylinder express what amount should be put in the tank, what makes tank ventilation indispensable, as well as larger dimensions of the tank.

Die Aufgabe der vorliegenden Erfindung war daher ein einfach aufgebauter und autark einsetzbarer Arbeitszylinder, der wie eingangs angegeben mit gegenüber der Zylinderinnenwandung vollständig dichten, ortsfesten Abdichtwänden für die Arbeitsräume versehen ist und dennoch die Unterstützung der durch das Arbeitsmedium bewirkten Ein- und/oder Ausfahrbewegung des Arbeitszylinders durch eine Gasfeder ohne die oben angeführten Nachteile ermöglich.The object of the present invention was therefore a simple one and self-sufficient working cylinder, which as stated at the beginning with opposite the cylinder inner wall completely tight, stationary sealing walls for the work rooms is provided and still the support of the working medium caused extension and / or extension movement of the working cylinder by a gas spring without the disadvantages mentioned above.

Zur Lösung dieser Aufgabe ist der Arbeitszylinder erfindungsgemäß dadurch gekennzeichnet, daß das Gasvolumen komplett innerhalb des Zylinderrohres eingeschlossen ist, und daß zumindest eine Entlüftungsöffnung den zwischen dem Gasvolumen und der Abdichtwand des Arbeitsraumes liegenden Raum mit der Umgebung verbindet. Damit ist in einfacher Weise eine Gasfeder gleich in den Arbeitszylinder integriert, so dass externe Gasbehälter und Verbindungen vom Arbeitszylinder dorthin vermieden werden können. Weiters ist dieser damit sehr einfach aufgebaute und kompakte Arbeitszylinder in einer Weise mit der Gasfeder gekoppelt, bei welcher die Arbeitsräume des Arbeitszylinders vom Gasvolumen der Gasfeder durch einen in die Umgebung entlüfteten Raum getrennt sind, aus welchem das aufgrund der Undichtheit der Gasfeder austretende Gas in die Umgebung abströmen kann und nicht in das System des Arbeitsfluids des Arbeitszylinders gelangen kann.To achieve this object, the working cylinder according to the invention characterized in that the gas volume is completely enclosed within the cylinder tube and that at least one vent opening between the gas volume and the sealing wall of the work area with the surroundings combines. So that a gas spring is the same in the working cylinder in a simple manner integrated so that external gas tanks and connections from the working cylinder there can be avoided. Furthermore, this is very simple and compact working cylinder coupled to the gas spring in a manner in which the Working spaces of the working cylinder from the gas volume of the gas spring through one into the Ventilated room are separated from which this is due to the leak the gas spring escaping gas can flow into the environment and not in the system of working fluid of the working cylinder can get.

Eine einfache und sehr kompakte Konstruktion des Arbeitszylinders bei Erhaltung aller oben genannten Vorteile kann mit einer Ausführungsform der Erfindung erzielt werden, bei welcher das verlängerte Zylinderrohr durch eine weitere ortsfeste Abdichtwand dicht abgeschlossen ist, daß zwischen dieser weiteren Abdichtwand und der Abdichtwand des Arbeitsraumes der Arbeitszylinders ein Gasfederkolben verschiebbar geführt und durch ein zwischen der weiteren Abdichtwand und dem Gasfederkolben eingeschlossenes Gasvolumen mit einer Kraft beaufschlagt ist. Damit ist eine Konstruktion mit lediglich drei Abdichtwänden gegeben, wobei der in die Umgebung entlüftete Raum jener zwischen dem verschiebbaren Gasfederkolben und der Abdichtwand des nächstliegenden Arbeitsraumes ist. Selbstverständlich ist in diesem Fall die Entlüftungsöffnung an einer Stelle angeordnet, welche vom Gasfederkolben in keiner seiner möglichen Stellungen überfahren wird.A simple and very compact construction of the working cylinder with maintenance All of the above advantages can be achieved with an embodiment of the invention can be achieved in which the elongated cylinder tube by another stationary Sealing wall is sealed that between this further sealing wall and the sealing wall of the working space of the working cylinder is a gas spring piston slidably guided and by a between the further sealing wall and the Gas spring piston enclosed gas volume is subjected to a force. In order to is a construction with only three sealing walls, the one in the Vented space between those between the sliding gas spring piston and is the sealing wall of the nearest work area. Of course, in In this case, the vent opening is arranged at a point away from the gas spring piston is not run over in any of its possible positions.

Gemäß einer weiteren vorteilhaften Ausführungsform der Erfindung ist vorgesehen, daß das verlängerte Zylinderrohr durch eine weitere ortsfeste Abdichtwand dicht abgeschlossen ist, daß es über diese weitere ortsfeste Abdichtwand noch weiter hinaus verlängert und durch einen Boden oder Anschlag für den Gasfederkolben abgeschlossen ist, wobei die zumindest eine Entlüftungsöffnung den von der Abdichtwand des Arbeitsraumes und der weiteren ortsfesten Abdichtwand definierten Raum mit der Umgebung verbindet. Damit ist eine voll funktionsfähige Gasfeder in den erfindungsgemäßen Zylinder in einer Weise integriert, daß durch deren Undichtheit jegliche negative Beeinflussung des hydraulischen Systems verhindert wird. Diese Konstruktion bietet aber auch die Möglichkeit, die Gasfeder auch auf der Stangenseite des Arbeitszylinders anzuordnen.According to a further advantageous embodiment of the invention, that the elongated cylinder tube through another fixed sealing wall is tightly closed that it goes beyond this further fixed sealing wall extended and by a bottom or stop for the gas spring piston is completed, the at least one vent opening from the sealing wall of the work area and the other fixed sealing wall Connects space with the environment. This means that a fully functional gas spring is in integrated the cylinder according to the invention in such a way that their leakage any negative influence on the hydraulic system is prevented. This Construction also offers the possibility of the gas spring on the rod side to arrange the working cylinder.

Einen sehr geringen Herstellungsaufwand und gute Eigenschaften bezüglich der Abdichtung des Gasvolumens bietet eine weitere Ausführungsform der Erfindung, bei weicher der zwischen der weiteren ortsfesten Abdichtwand und dem Boden verschiebbare Bauteil allein eine Gasfederkolbenstange mit im wesentlichen über die gesamte, zwischen Abdichtwand und Boden verschiebbare Länge gleichem Querschnitt ist.A very low manufacturing effort and good properties regarding the sealing of the gas volume offers a further embodiment of the invention, if soft, between the other fixed sealing wall and the floor Slidable component alone a gas spring piston rod with essentially over the Total length of the same cross-section that can be moved between the sealing wall and the floor is.

Gemäß einem weiteren Erfindungsmerkmal ist eine baulich sehr einfache Ausführungsform möglich, bei welcher die Gasfederkolbenstange fix mit der Arbeitskolbenstange verbunden ist, vorzugsweise einstückig damit ausgeführt ist.According to a further feature of the invention, it is a structurally very simple embodiment possible, in which the gas spring piston rod is fixed to the working piston rod is connected, preferably in one piece with it.

Daneben sind auch erfindungsgemäße Konstruktionen möglich, bei welchen der Arbeitszylinder und die Gasfeder getrennte Kolbenstangen haben, d.h. die Gasfederkolbenstange und die Arbeitskolbenstange getrennte Bauteile sind. Durch die Wirkung des Gasvolumens wird die durch eine Abdichtwand hindurchgeführte Gasfederkolbenstange in bestimmten Relativstellungen von Arbeitskolben und Gasfederkolben am Arbeitskolben anliegen und diesen mit einer Kraft in einer seiner Bewegungsrichtung beaufschlagen.In addition, constructions according to the invention are also possible, in which the working cylinder and gas spring have separate piston rods, i.e. the gas spring piston rod and the working piston rod are separate components. Through the The effect of the gas volume is the gas spring piston rod which is guided through a sealing wall in certain relative positions of the working piston and gas spring piston rest on the working piston and this with a force in one of its directions of movement apply.

Vorteilhafterweise ist gemäß einem weiteren Erfindungsmerkmal der Arbeitszylinder doppeltwirkend ausgeführt und sind Anschlüsse für das Druckfluid auf beiden Seiten des Arbeitskolbens vorgesehen, wodurch der Arbeitszylinder für eine größere Zahl von Anwendungsmöglichkeiten geeignet ist und seine Aus- und/oder Einfahrbewegung durch zumindest eine Gasfeder unterstützt werden kann.According to a further feature of the invention, the working cylinder is advantageous Double-acting and are connections for the pressure fluid on both Provided sides of the working piston, which makes the working cylinder for one is suitable for a greater number of possible uses and its training and / or Entry movement can be supported by at least one gas spring.

Besonders einfach ist der Aufbau des Arbeitszylinders bei einer Ausführungsform, bei welcher die zumindest eine Entlüftungsöffnung im Zylinderrohr ausgearbeitet ist.The construction of the working cylinder is particularly simple in one embodiment, in which the at least one ventilation opening is worked out in the cylinder tube is.

Vorteilhafterweise ist die weitere Abdichtwand auf der der Arbeitskolbenstange gegenüberliegenden Seite des Arbeitskolbens vorgesehen und bildet vorzugsweise gleichzeitig den Boden des Arbeitszylinders.The further sealing wall on the working piston rod is advantageously opposite side of the working piston provided and preferably forms at the same time the bottom of the working cylinder.

In der nachfolgenden Beschreibung soll die Erfindung anhand von vier speziellen, in den beigefügten Zeichnungen dargestellten Ausführungsbeispielen in nicht einschränkender Weise näher erläutert werden.In the following description, the invention is based on four special, illustrated in the accompanying drawings in are not explained in any restrictive manner.

Dabei zeigt die Fig. 1 einen erfindungsgemäßen Arbeitszylinder mit bodenseitig integrierter Gasfeder mit Gasfederkolben im Längsschnitt, Fig. 2 zeigt einen Längsschnitt durch einen Arbeitszylinder mit stangenseitiger Gasfeder und einstückiger Kolbenstange, Fig. 3 ist ein Längsschnitt durch einen Arbeitszylinder mit stangenseitiger Gasfeder, jedoch getrennten Kolbenstangen, und die Fig. 4 zeigt einen Längsschnitt durch einen Arbeitszylinder mit wiederum bodenseitiger Gasfeder und einstückiger Kolbenstange, jedoch ohne Gasfederkolben.1 shows a working cylinder according to the invention with the bottom side Integrated gas spring with gas spring piston in longitudinal section, Fig. 2 shows one Longitudinal section through a working cylinder with gas spring on the rod side and in one piece Piston rod, Fig. 3 is a longitudinal section through a working cylinder with rod-side Gas spring, but separate piston rods, and Fig. 4 shows one Longitudinal section through a working cylinder with gas spring and bottom one-piece piston rod, but without gas spring piston.

Der vorzugsweise hydraulische Arbeitszylinder der Fig. 1 besteht aus einem Zylinderrohr 1, einem Boden 2 und einem Deckel 3. Der Boden 2 dient zur Anlenkung des Arbeitszylinders an einem ersten Anlenkpunkt und weist dazu beispielsweise eine Bohrung 4 auf. Der Deckel 3 wiederum bildet einen Anschlag für den im Zylinderrohr 1 verschiebbar gelagerten Arbeitskolben 5, mit welchem eine Arbeitskolbenstange 6 verbunden und durch den Deckel 3 abgedichtet hinausgeführt ist, welche Arbeitskolbenstange 6 mit ihrem Stangenkopf 7 zur Verbindung des Arbeitszylinders mit einem zweiten Anlenkpunkt vorgesehen ist, beispielsweise ebenfalls über eine Bohrung 4. Zwischen dem Boden 2 und dem Arbeitskolben 5 ist in das Zylinderrohr 1 eine Abdichtwand 8 dichtend eingesetzt, welche den eigentlichen Arbeitszylinder begrenzt. Der Arbeitskolben 5 ist somit zwischen der Abdichtwand 8 und dem Deckel 3 durch die Wirkung eines Hydraulikmediums verschiebbar, welches den zwischen der Abdichtwand 8, dem Arbeitskolben 5 und dem Deckel 3 definierten Arbeitsräumen 9 über Anschlüsse 10 zugeführt bzw. aus diesen abgeleitet wird. The preferably hydraulic working cylinder of FIG. 1 consists of a Cylinder tube 1, a bottom 2 and a cover 3. The bottom 2 is used for articulation of the working cylinder at a first articulation point and points to this, for example a hole 4 on. The cover 3 in turn forms a stop for the in the cylinder barrel 1 displaceably mounted working piston 5, with which a working piston rod 6 connected and led out sealed by the cover 3, which Piston rod 6 with its rod head 7 for connecting the working cylinder is provided with a second articulation point, for example also over a bore 4. Between the bottom 2 and the working piston 5 is in the cylinder tube 1 a sealing wall 8 used sealing, which the actual working cylinder limited. The working piston 5 is thus between the sealing wall 8 and the Cover 3 displaceable by the action of a hydraulic medium, which between the sealing wall 8, the working piston 5 and the cover 3 defined work spaces 9 is supplied via connections 10 or is derived therefrom.

Zwischen der im wesentlichen in der Längsmitte des Zylinderrohres 1 ortsfest eingesetzten Abdichtwand 8 und dem ebenfalls ortsfesten Boden 2 des Arbeitszylinders ist ein Gasfederkolben 11 verschiebbar eingesetzt, welcher durch ein zwischen diesem Gasfederkolben 11 und dem Boden 2 eingeschlossenes Gasvolumen im Raum 12 beaufschlagt wird und derart eine Kraft in Richtung des Ausfahrens der Arbeitskolbenstange 6 ausübt. Diese Kraft wird mittels der mit dem Gasfederkolben 11 verbundenen Gasfederkolbenstange 13 auf den Arbeitskolben 5 bzw. die Arbeitskolbenstange 6 übertragen. Zu diesem Zweck ist die Gasfederkolbenstange 13 dichtend durch die Abdichtwand 8 hindurch in den zwischen Abdichtwand 8 und Arbeitskolben 5 definierten Arbeitsraum 9 des Arbeitszylinders hineingeführt und drückt - zumindest in bestimmten Relativstellungen von Arbeitskolben 5 und Gasfederkolben 11 - gegen den Arbeitskolben 5 bzw. die Arbeitskolbenstange 6. Um nun das Entweichen von Gas aus dem Raum 12 zwischen Boden 2 und Gasfederkolben 11, welches Gas aufgrund der inherenten Undichtigkeit jeder Gasfeder am Gasfederkolben 11 vorbei gelangt, in die Umgebung zu ermöglichen und nicht in das hydraulische System des Arbeitszylinders gelangen zu lassen, ist im Zylinderrohr 1 zumindest eine Entlüftungsöffnung 14 ausgearbeitet, die den Raum 15 zwischen dem Gasfederkolben 11 und der mittleren, ortsfesten Abdichtwand 8 mit der Umgebung des Arbeitszylinders verbindet. Die Länge des Zylinderrohres 1 zwischen Boden 2 und Abdichtwand 8 sowie die Lage jeder Entlüftungsöffnung 14 ist selbstverständlich derart gewählt, dass der Gasfederkolben 11 in keiner Stellung diese Entlüftungsöffnungen 14 überfahren kann.Fixed between the substantially in the longitudinal center of the cylinder tube 1 used sealing wall 8 and the also stationary base 2 of the working cylinder is a gas spring piston 11 slidably inserted, which by a between this gas spring piston 11 and the bottom 2 enclosed gas volume in Space 12 is applied and such a force in the direction of the extension of the working piston rod 6 exercises. This force is generated by means of the gas spring piston 11 connected gas spring piston rod 13 on the working piston 5 or the working piston rod 6 transferred. For this purpose, the gas spring piston rod 13 is sealing through the sealing wall 8 into the between the sealing wall 8 and the working piston 5 defined working space 9 of the working cylinder and pushes - at least in certain relative positions of working piston 5 and gas spring piston 11 - against the working piston 5 or the working piston rod 6. Now the escape of gas from the space 12 between the bottom 2 and gas spring piston 11, which gas due to the inherent leakage of each gas spring past the gas spring piston 11 gets into the environment and not into the hydraulic system of the To allow the working cylinder to reach, there is at least one ventilation opening in the cylinder tube 1 14 worked out, the space 15 between the gas spring piston 11th and the central, stationary sealing wall 8 with the surroundings of the working cylinder combines. The length of the cylinder tube 1 between the base 2 and the sealing wall 8 as well as the position of each ventilation opening 14 is of course chosen in such a way that the gas spring piston 11 has no vent openings 14 in any position can run over.

Eine weitere Ausführungsform eines erfindungsgemäßen Arbeitszylinders zeigt die Fig. 2. Hier ist nun, im Gegensatz zur bodenseitigen Gasfeder der Fig. 1, die Gasfederanordnung mit den nachfolgend erläuterten Abänderungen auf der Stangenseite des Arbeitszylinders vorgesehen.Another embodiment of a working cylinder according to the invention 2 shows. Here, in contrast to the gas spring on the bottom of FIG. 1, the gas spring arrangement with the changes explained below on the rod side of the working cylinder provided.

Die Arbeitsräume 9 des Arbeitszylinders sind zwischen dem Boden 2 und einer ortsfesten, im mittleren Längsbereich des Zylinderrohres 1 angeordneten Abdichtwand 8 definiert, zwischen welchen Begrenzungen der Arbeitskolben 5 verschiebbar geführt ist. Die Arbeitskolbenstange 6 ist dichtend durch die Abdichtwand 8 hindurchgeführt und auch durch den Deckel 3 des Arbeitszylinders hindurch, welcher Deckel 3 aber nun lediglich einen ortsfesten Anschlag für den Gasfederkolben 11 darstellt. Dieser Gasfederkolben 11 sitzt ortsfest auf der Arbeitskolbenstange 6, welche in diesem Fall gleichzeitig auch die Gasfederkolbenstange darstellt und beaufschlagt diese Arbeitskolbenstange 6 mit einer Kraft, welche vom Gasvolumen bewirkt wird, das in einem Raum 12 zwischen dem Gasfederkolben 11 und einer weiteren, ortsfesten Abdichtwand 16 eingeschlossen ist. Die Arbeits- und gleichzeitig Gasfederkolbenstange 6 ist dichtend auch durch die weitere Abdichtwand 16 hindurchgeführt, wobei diese Abdichtwand 16 von der ersten ortsfesten Abdichtwand 8 etwas beabstandet ist. Zwischen diesen Abdichtwänden 8 und 16 ist der in die Umgebung über zumindest eine Öffnung 14 entlüftete Raum 15 definiert, in welchen aus der Gasfederanordnung austretendes Gas unmittelbar gelangt. Damit kein Gegendruck zur Wirkung der Gasfederanordnung aufgebaut wird, wenn Gas aus dem Raum 12 der Gasfederanordnung am Gasfederkolben 11 vorbei stangenseitig austritt, ist auch der Raum 17 zwischen dem Gasfederkolben 11 und dem Deckel 3 des Arbeitszylinders mittels zumindest einer Entlüftungsöffnung 18 mit der Umgebung verbunden.The working spaces 9 of the working cylinder are between the floor 2 and one stationary sealing wall arranged in the central longitudinal region of the cylinder tube 1 8 defines the limits between which the working piston 5 can be displaced is led. The working piston rod 6 is sealed by the sealing wall 8 passed and also through the cover 3 of the working cylinder, which Cover 3 but now only a fixed stop for the gas spring piston 11. This gas spring piston 11 is fixed in place on the working piston rod 6, which in this case also represents and acts on the gas spring piston rod this working piston rod 6 with a force caused by the gas volume that is in a space 12 between the gas spring piston 11 and another, stationary sealing wall 16 is included. The working and gas spring piston rod at the same time 6 is also sealingly passed through the further sealing wall 16, this sealing wall 16 somewhat from the first stationary sealing wall 8 is spaced. Between these sealing walls 8 and 16 is the surrounding area Defined via at least one opening 14 ventilated space 15, in which from the Escaping gas spring assembly arrives immediately. So there is no back pressure is built up to the effect of the gas spring arrangement when gas from the space 12 the gas spring assembly exits the gas spring piston 11 on the rod side is also the space 17 between the gas spring piston 11 and the cover 3 of the working cylinder connected to the surroundings by means of at least one vent opening 18.

Die Fig. 3 zeigt einen der Fig. 2 sehr ähnlich aufgebauten Arbeitszylinder mit integrierter Gasfeder, wobei aber nun keine einstückige Kolbenstange für Arbeitszylinder und Gasfeder vorhanden ist, sondern diese beiden Teile separate Teile sind. Der wiederum stangenseitig angeordnete Gasfederkolben 11 ist mit einer Gasfederkolbenstange 13 verbunden, welche durch den Deckel 3, wiederum auch als Anschlag für den Gasfederkolben 11 wirkend, hindurchgeführt und mit dem Stangenkopf 7 zur Anlenkung an einem Anlenkpunkt versehen ist.FIG. 3 shows a working cylinder with a construction very similar to that of FIG. 2 Integrated gas spring, but now no one-piece piston rod for working cylinders and gas spring is present, but these two parts are separate parts. The gas spring piston 11, which in turn is arranged on the rod side, is provided with a gas spring piston rod 13 connected, which through the cover 3, again as a stop acting for the gas spring piston 11, passed and with the rod head 7 is provided for articulation at an articulation point.

Die eigentliche steuerbare Betätigungskraft auf den Stangenkopf 7 wird aber durch den Arbeitskolben 5 erzeugt, welcher zwischen dem Boden 2 und der ersten ortsfesten mittleren Abdichtwand 8 durch ein Hydraulikmedium verschiebbar ist. Die Bewegung des Arbeitskolbens 5 wird über die mit diesem Kolben 5 verbundene Arbeitskolbenstange 6 auf den Gasfederkolben 11 bzw. die Gasfederkolbenstange 13 übertragen, wobei die Arbeitskolbenstange dichtend durch die mittlere ortsfeste Abdichtwand 8 und auch die weitere ortsfeste Abdichtwand 16 hindurchgeführt ist. In bestimmten Relativstellungen von Arbeitskolben 5 und Gasfederkolben 11 addieren sich dann die Wirkungen der Gasfüllung im Raum 12 und die des Hydraulikmediums im bodenseitigen Arbeitsraum 9. Wenngleich sie auch nicht dargestellt sind, können selbstverständlich auch in dieser Ausführungsform sowohl Entlüftungsöffnungen 14 für den Raum 15 zwischen den beiden mittleren ortsfesten Abdichtwänden 8 und 16 als auch für den Raum 17 zwischen Gasfederkolben 11 und Deckel 3 vorhanden sein.The actual controllable operating force on the rod head 7 is generated by the working piston 5, which between the bottom 2 and the first fixed middle sealing wall 8 is displaceable by a hydraulic medium. The Movement of the working piston 5 is via the working piston rod connected to this piston 5 6 on the gas spring piston 11 or the gas spring piston rod 13 transferred, with the working piston rod sealing through the middle stationary sealing wall 8 and the further stationary sealing wall 16 is passed through. In add certain relative positions of the working piston 5 and gas spring piston 11 then the effects of the gas filling in space 12 and that of the hydraulic medium in the floor-side work area 9. Although they are also not shown, they can naturally also in this embodiment both ventilation openings 14 for the space 15 between the two central fixed sealing walls 8 and 16 as well as for the space 17 between gas spring piston 11 and cover 3 his.

Das Ausführungsbeispiel der Fig. 4 ähnelt wiederum der Fig. 1 und weist ebenfalls eine bodenseitig angeordnete Gasfeder auf. Allerdings ist kein Gasfederkolben 11 vorhanden, sondern die Arbeitskolbenstange 6 über den Arbeitskolben 5 hinaus in Richtung des Bodens 2 soweit verlängert, dass sie dichtend durch die ortsfeste Abdichtwand 8 und eine weitere ortsfeste Abdichtwand 16 hindurch geführt werden kann und in den zwischen Boden 2 und weiterer Abdichtwand 16 definierten Raum 12 hineinragt. Dieser Raum 12 beinhaltet das Gasvolumen, welches die Stirnfläche der Kolbenstange 6 mit der die hydraulische Bewegung der Kolbenstange 6 unterstützenden Gasfederkraft beaufschlagt. Der zwischen den beiden Abdichtwänden 8 und 16 definierte Raum ist über zumindest eine Entlüftungsöffnung 14 mit der Umgebung verbunden, so dass durch die Abdichtwand 16 austretendes Gas in die Umgebung abströmen kann und nicht in das hydraulische System des Arbeitszylinders gelangen kann.The embodiment of FIG. 4 is again similar to FIG. 1 and has also has a gas spring on the bottom. However, it is not a gas spring piston 11 available, but the piston rod 6 over the piston 5 extended towards the bottom 2 so far that they seal through the stationary Sealing wall 8 and another stationary sealing wall 16 passed through can be and in the defined between floor 2 and another sealing wall 16 Room 12 protrudes. This space 12 contains the gas volume, which is the end face the piston rod 6 with the hydraulic movement of the piston rod 6 supporting gas spring force. The one between the two sealing walls 8 and 16 defined space is via at least one vent 14 with the Connected environment, so that gas emerging through the sealing wall 16 in the Environment can flow out and not into the hydraulic system of the working cylinder can reach.

Claims (9)

  1. A working cylinder with a cylinder liner (1), with at least two sealing walls (8, 2 and 3) that are axially spaced apart from one another and realized stationary relative to the cylinder liner, with a working piston (5) that defines at least one working chamber (9) together with at least one sealing wall and can be displaced between the two sealing walls by means of a hydraulic fluid that can be introduced into and discharged from each working chamber via least one respective connection (10), and with a working piston rod (6) that is connected to the working piston (5) and extends in a sealed fashion through at least one of the sealing walls, wherein the cylinder liner (1) is extended beyond at least one of the stationary sealing walls (8), and wherein a displaceable component (6, 11) accommodated in the extended section is subjected to a force by means of a gas volume (12) in the extended section of the cylinder liner and acts upon the working piston (5) by means of a piston rod (6, 13) that extends in a sealed fashion through one sealing wall (8) of the working chamber (9), characterized in that the gas volume (12) is completely enclosed within the cylinder liner (1), and in that at least one ventilation opening (14) connects the space (15) situated between the gas volume (12) and the sealing wall (8) of the working chamber (9) to the surroundings.
  2. The working cylinder according to Claim 1, characterized in that the extended cylinder liner (1) is tightly sealed by means of an additional stationary sealing wall (2), and in that the piston (11) of a pneumatic spring is guided in a displaceable fashion between this additional sealing wall (2) and the sealing wall (8) of the working chamber (9) of the working cylinder and subjected to a force by means of a gas volume (12) enclosed between the additional sealing wall (2) and the piston (11) of the pneumatic spring (Figure 1).
  3. The working cylinder according to Claim 1, characterized in that the extended cylinder liner (1) is tightly sealed by means of an additional stationary sealing wall (16), and in that the cylinder liner is further extended beyond this additional stationary sealing wall (16) and closed for the displaceable component (6, 11) by means of a bottom (2) or limit stop (3), wherein the at least one ventilation opening (14) connects the space (15) defined by the sealing wall (8) of the working chamber (9) and the additional stationary sealing wall (15) [sic] to the surroundings (Figures 2, 3, 4).
  4. The working cylinder according to Claim 3, characterized in that the component that can be displaced between the additional stationary sealing wall (16) and the bottom (2) consists of only a piston rod (6) with essentially the same cross section over the entire length that can be displaced between the sealing wall (16) and the bottom (2) (Figure 4).
  5. The working cylinder according to one of Claims 1-4, characterized in that the piston rod of the pneumatic spring is rigidly connected to the working piston rod (6), preferably realized integrally therewith (Figures 2, 4).
  6. The working cylinder according to one of Claims 1-4, characterized in that the piston rod (13) of the pneumatic spring and the working piston rod (6) are realized in the form of separate components (Figures 1, 3).
  7. The working cylinder according to one of Claims 1-6, characterized in that the working cylinder is realized in the form of a double-action cylinder, and in that connections (10) for the hydraulic fluid are provided on both sides of the working piston (5).
  8. The working cylinder according to one of Claims 1-7, characterized in that the at least one ventilation opening (14) is machined into the cylinder liner (1).
  9. The working cylinder according to one of Claims 1-8, characterized in that the additional sealing wall is arranged on the side of the working piston (5) which lies opposite of the working piston rod (6) and preferably also forms the bottom (2) of the working cylinder (Figures 1, 4).
EP20020450006 2001-01-19 2002-01-16 Fluid actuated cylinder with gas spring Expired - Lifetime EP1225345B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT932001 2001-01-19
AT932001A AT410357B (en) 2001-01-19 2001-01-19 WORKING CYLINDER

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
DE102005021716A1 (en) * 2005-05-11 2006-11-16 Zf Friedrichshafen Ag Hydraulic actuating drive has transverse bore for ventilating of bush and is connected to slot which communicates with environment, wherein transverse bore is permanently connected to piston intermediate chamber
DE102005060869A1 (en) * 2005-12-20 2007-06-21 Stabilus Gmbh Actuating arrangement for movable parts, especially flaps in motor vehicles, has gas spring and working cylinder arranged in series to form unit, whereby working piston is acted upon in deployment direction by gas piston rod

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Publication number Priority date Publication date Assignee Title
AT412114B (en) 2002-09-25 2004-09-27 Hoerbiger Hydraulik DOUBLE-ACTING WORK CYLINDER
DE102006020104B4 (en) * 2006-04-29 2010-07-29 Stabilus Gmbh actuator
DE102006020082A1 (en) * 2006-04-29 2007-11-08 Stabilus Gmbh Adjusting element for opening mechanisms on flaps has a piston to move in a cylindrical casing and to divide the casing into two chambers
NL2003161C2 (en) * 2009-07-09 2011-01-11 Actuant Corp METHOD FOR MANUFACTURING A GAS FILLED DOUBLE ACTING HYDRAULIC DRIVE CYLINDER WITH INTEGRATED GAS FEEDER
CN106286430B (en) * 2016-10-17 2018-02-02 山河智能装备股份有限公司 A kind of piston accumulator

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DE2635248C2 (en) * 1976-08-05 1986-08-07 Colt International Gmbh, 4190 Kleve Device for opening and closing a ventilation flap of fire ventilators
FR2547015B1 (en) * 1983-06-06 1985-07-26 Amri ACTUATOR WITH PNEUMATIC ENERGY ACCUMULATOR, PARTICULARLY FOR TAP
JPS60208612A (en) * 1984-03-30 1985-10-21 Shimadzu Corp Cylinder type actuator
JPS60237207A (en) * 1984-05-09 1985-11-26 Mitsubishi Electric Corp Reciprocating device
US5921604A (en) * 1996-05-16 1999-07-13 Applied Power Inc. Hydraulic door operating system
JP2998073B2 (en) * 1997-02-10 2000-01-11 株式会社キッツ Valve drive
JP3003074B2 (en) * 1997-02-10 2000-01-24 株式会社キッツ Valve drive

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005021716A1 (en) * 2005-05-11 2006-11-16 Zf Friedrichshafen Ag Hydraulic actuating drive has transverse bore for ventilating of bush and is connected to slot which communicates with environment, wherein transverse bore is permanently connected to piston intermediate chamber
DE102005060869A1 (en) * 2005-12-20 2007-06-21 Stabilus Gmbh Actuating arrangement for movable parts, especially flaps in motor vehicles, has gas spring and working cylinder arranged in series to form unit, whereby working piston is acted upon in deployment direction by gas piston rod
DE102005060869B4 (en) * 2005-12-20 2009-04-02 Stabilus Gmbh actuator assembly

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ATA932001A (en) 2002-08-15
AT410357B (en) 2003-04-25
DE50200439D1 (en) 2004-06-24

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