EP1793050B1 - Hydraulikzylinder mit Endlagendämpfung - Google Patents

Hydraulikzylinder mit Endlagendämpfung Download PDF

Info

Publication number
EP1793050B1
EP1793050B1 EP06017903.3A EP06017903A EP1793050B1 EP 1793050 B1 EP1793050 B1 EP 1793050B1 EP 06017903 A EP06017903 A EP 06017903A EP 1793050 B1 EP1793050 B1 EP 1793050B1
Authority
EP
European Patent Office
Prior art keywords
hydraulic cylinder
hydraulic
valve
piston
plunger
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.)
Active
Application number
EP06017903.3A
Other languages
English (en)
French (fr)
Other versions
EP1793050A3 (de
EP1793050A2 (de
Inventor
Michael Stucke
Oliver Schwenkkrauss
Hans-Peter Lavergne
Thomas Zitterbart
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.)
Liebherr Hydraulikbagger GmbH
Original Assignee
Liebherr Hydraulikbagger GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Liebherr Hydraulikbagger GmbH filed Critical Liebherr Hydraulikbagger GmbH
Publication of EP1793050A2 publication Critical patent/EP1793050A2/de
Publication of EP1793050A3 publication Critical patent/EP1793050A3/de
Application granted granted Critical
Publication of EP1793050B1 publication Critical patent/EP1793050B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02FDREDGING; SOIL-SHIFTING
    • E02F9/00Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20Drives; Control devices
    • E02F9/22Hydraulic or pneumatic drives
    • E02F9/2203Arrangements for controlling the attitude of actuators, e.g. speed, floating function
    • E02F9/2214Arrangements for controlling the attitude of actuators, e.g. speed, floating function for reducing the shock generated at the stroke end
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66FHOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075Constructional features or details
    • B66F9/20Means for actuating or controlling masts, platforms, or forks
    • B66F9/22Hydraulic devices or systems
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/04Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
    • F15B11/046Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed depending on the position of the working member
    • F15B11/048Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed depending on the position of the working member with deceleration control
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20Other details, e.g. assembly with regulating devices
    • F15B15/22Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/40Flow control
    • F15B2211/405Flow control characterised by the type of flow control means or valve
    • F15B2211/40515Flow control characterised by the type of flow control means or valve with variable throttles or orifices
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/40Flow control
    • F15B2211/415Flow control characterised by the connections of the flow control means in the circuit
    • F15B2211/41527Flow control characterised by the connections of the flow control means in the circuit being connected to an output member and a directional control valve
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/40Flow control
    • F15B2211/42Flow control characterised by the type of actuation
    • F15B2211/421Flow control characterised by the type of actuation mechanically
    • F15B2211/424Flow control characterised by the type of actuation mechanically actuated by an output member of the circuit
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/40Flow control
    • F15B2211/455Control of flow in the feed line, i.e. meter-in control
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/70Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/755Control of acceleration or deceleration of the output member
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/80Other types of control related to particular problems or conditions
    • F15B2211/85Control during special operating conditions
    • F15B2211/853Control during special operating conditions during stopping

Definitions

  • the invention relates to a hydraulic cylinder with a piston and a piston rod according to the preamble of claim 1.
  • end position damping In order to avoid an abrupt stopping of a movement caused by a hydraulic cylinder when reaching the end position of the piston in the hydraulic cylinder, it is already known to provide end position damping. With simple cylinders and small piston speeds, stop rings are usually sufficient to catch the pistons at the stroke end. For larger piston speeds, however, a special cushioning is constructive. Here there is the possibility of damping by means of so-called damping pins on the piston rods. Frequently, hydraulic end position dampers are used. In this case, the kinetic energy of the piston mass is reduced by the fact that the rest of the volume displaced by the piston oil volume by gaps or throttles, which are provided in the end position of the cylinder, are passed.
  • Such a hydraulic cylinder is off GB 519,321 A known.
  • the object of the invention is now to equip conventional hydraulic cylinder optionally with a bottom-side damping.
  • series hydraulic cylinders without end cushioning to convert accordingly.
  • the throttle valve may consist of a displaceable in a housing via a plunger valve unit, which by actuation of the plunger in the Fluid path of the hydraulic fluid is movable to throttle in this position, the hydraulic fluid flow rate.
  • the end position damping acts only at the stroke end, a check valve is integrated in the throttle valve, over which the cushioning can be bypassed at Hubbeginn.
  • the plunger via which the displaceable valve unit can be brought into the throttle valve shortly before reaching the end position of the piston in the throttle position, acted upon by a gripper mechanism of a construction or handling machine.
  • a gripper mechanism of a construction or handling machine acted upon by a gripper mechanism of a construction or handling machine.
  • a hydraulic cylinder 10 is shown schematically.
  • a piston 12 with a piston rod 14 is slidably disposed.
  • a junction point A in the hydraulic cylinder 10 opens a hydraulic line 16.
  • a junction point B of the hydraulic cylinder 10 opens a hydraulic line 18.
  • the hydraulic lines 16 and 18 are part of a known per se in the prior art hydraulic circuit having a hydraulic sump 20 in the illustrated embodiment.
  • a control valve 22 serves for switching.
  • a switchable throttle valve 24 is integrated between the switching valve 22 and the mouth B of the hydraulic line 18.
  • the switchable throttle valve 24 has a housing 26, into which mouth points P and Z of the line 18 lead.
  • the housing 26 has a centrally mounted cylindrical chamber 28, in which the throttle valve 30 is movable in the longitudinal direction back and forth.
  • the length of the cylindrical chamber 28 and the throttle valve 30 is dimensioned so that the throttle valve between two end positions is movable back and forth.
  • the respective end positions are in the FIGS. 2 and 3 shown.
  • the throttle valve 30 In the opposite end position according to FIG. 3 is the throttle valve 30 is pushed between the orifice points P and Z, so that the hydraulic oil flowing from P to Z is throttled through this throttle valve 30.
  • the throttle valve 30 is only when the piston 12 is short of the end stop, in the end position according to FIG. 3 pressed.
  • a mechanically operated plunger 32 which transmits the movement on a displaceably mounted in the housing 26 valve piston.
  • the plunger can be actuated for example by a gripping mechanism of a construction vehicle or a handling vehicle, such as a wooden gripper. This operation is kinematically switched so that it takes place shortly before reaching the end stop and thus only leads to damping at this time.
  • valve piston 34 always in the in FIG. 2 shown end position, unless it is on the plunger 32 in the direction of the end position according to FIG. 3 is forcibly moved.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Transportation (AREA)
  • Mining & Mineral Resources (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Actuator (AREA)
  • Fluid-Pressure Circuits (AREA)

Description

  • Die Erfindung betrifft einen Hydraulikzylinder mit einem Kolben und einer Kolbenstange nach dem Oberbegriff des Anspruchs 1.
  • Um ein abruptes Abstoppen einer durch einen Hydraulikzylinder bewirkten Bewegung bei Erreichen der Endlage des Kolbens im Hydraulikzylinder zu vermeiden, ist es bereits bekannt, Endlagendämpfungen vorzusehen. Bei einfachen Zylindern und kleinen Kolbengeschwindigkeiten reichen in der Regel Anschlagringe aus, um die Kolben am Hubende abzufangen. Bei größeren Kolbengeschwindigkeiten jedoch ist eine besondere Endlagendämpfung konstruktiv vorzusehen. Hier gibt es die Möglichkeit einer Dämpfung mittels sogenannter Dämpfungszapfen auf den Kolbenstangen. Häufig werden hydraulische Endlagendämpfer verwendet. Dabei wird die kinetische Energie der Kolbenmasse dadurch vermindert, dass der Rest des vom Kolben verdrängten Ölvolumens durch Spalte oder Drosseln, die im Endlagenbereich der Zylinder vorgesehen sind, geleitet werden.
  • Nachteilig bei diesen Lösungen ist es, dass die jeweiligen Hydraulikzylinder von vorneherein konstruktiv mit der Endlagendämpfung ausgestattet sein müssen. Das bedeutet, dass eine Nachrüstung von einfachen Serienhydraulikzylindern nicht möglich ist. Vielmehr müssen bereits vorhandene Serienhydraulikzylinder durch die speziell ausgestalteten Hydraulikzylinder mit Endlagendämpfung ausgetauscht werden.
  • Ein solcher Hydraulikzylinder ist aus GB 519 321 A bekannt.
  • Aufgabe der Erfindung ist es nun, konventionelle Hydraulikzylinder optional mit einer bodenseitigen Dämpfung auszustatten. Dabei sollen sich Serienhydraulikzylinder ohne Endlagendämpfung entsprechend umrüsten lassen.
  • Erfindungsgemäß wird diese Aufgabe durch einen Hydraulikzylinder mit den Merkmalen des Anspruchs 1 gelöst.
  • Diese Lösung ermöglicht es, Serienhydraulikzylinder mit einer Endlagendämpfung nachzurüsten. Dies ist dadurch bedingt, dass der eingesetzte Hydraulikzylinder nicht verändert werden muss. Dadurch entfällt auch die zusätzliche Bereitstellung eines neuen Hydraulikzylinders für den Ersatzteilbedarf. Der Anwender kann zu jedem Zeitpunkt entscheiden, ob er eine Endlagendämpfung wünscht oder nicht. Soweit das Drosselventil auf der Hydraulikfluidzulaufseite angeordnet ist, kann ein den Hydraulikzylinder schonendes und energieeffizientes Dämpfungsprinzip durch die Drosselung des Hydraulikzylinderzulauffluids erfolgen.
  • Vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus den sich an den Hauptanspruch anschließenden Unteransprüchen.
  • Demnach kann das Drosselventil aus einer in einem Gehäuse über einen Stößel verschiebbaren Ventileinheit bestehen, die durch Betätigung des Stößels in den Fluidweg des Hydraulikfluids bewegbar ist, um in dieser Position den Hydraulikfluidvolumenstrom zu drosseln.
  • Damit die Endlagendämpfung nur beim Hubende wirkt, ist im Drosselventil ein Rückschlagventil integriert, über das die Endlagendämpfung bei Hubbeginn umgangen werden kann.
  • Erfindungsgemäß wird der Stößel, über den die verschiebbare Ventileinheit in dem Drosselventil kurz vor Erreichen der Endlage des Kolbens in die Drosselposition gebracht werden kann, über eine Greifermechanik einer Bau- oder Umschlagmaschine beaufschlagt. Hierdurch wird erreicht, dass die Bewegung des Kolbens im Hydraulikzylinder erst in einem gewünschten Endbereich wirksam wird. So kann beispielsweise eine Endlagendämpfung bei einem Hydraulikzylinder, der für einen Holzgreifer eingesetzt wird, vorgesehen werden.
  • Es wird eine Bau- oder Umschlagmaschine mit mindestens einem Hydraulikzylinder entsprechend dem vorher beschriebenen Aufbau gesondert unter Schutz gestellt.
  • Weitere Einzelheiten und Vorteile der Erfindung werden anhand eines in der Zeichnung dargestellten Ausführungsbeispiels näher erläutert. Es zeigen:
  • Figur 1:
    ein Schaltschema des schematisch dargestellten Hydraulikzylinders gemäß einer Ausführungsform der vorliegenden Erfindung,
    Figur 2:
    das in der Hydraulikleitung des Hydraulikzylinders gemäß Figur 1 eingebaute Drosselventil in einer ersten Endlage und
    Figur 3:
    das vorgenannte Drosselventil in einer anderen Endlage.
  • In der Figur 1 ist ein Hydraulikzylinder 10 schematisch dargestellt. In diesem ist ein Kolben 12 mit einer Kolbenstange 14 verschieblich angeordnet. In einem Einmündungspunkt A im Hydraulikzylinder 10 mündet eine Hydraulikleitung 16. In dem Einmündungspunkt B des Hydraulikzylinders 10 mündet eine Hydraulikleitung 18. Die Hydraulikleitungen 16 und 18 sind Teil eines an sich im Stand der Technik bekannten Hydraulikkreislaufs, der im hier dargestellten Ausführungsbeispiel einen Hydrauliksumpf 20 aufweist. Zur Schaltung dient ein Steuerventil 22. Entsprechend der vorliegenden Erfindung ist zwischen dem Schaltventil 22 und der Mündung B der Hydraulikleitung 18 ein schaltbares Drosselventil 24 integriert. Das schaltbare Drosselventil 24 weist ein Gehäuse 26 auf, in welches Mündungspunkte P und Z der Leitung 18 hineinführen. Im Inneren weist das Gehäuse 26 eine zentrisch gelagerte zylindrische Kammer 28 auf, in der das Drosselventil 30 in Längsrichtung hin und her bewegbar ist. Dabei ist die Länge der zylindrischen Kammer 28 und des Drosselventils 30 so bemessen, dass das Drosselventil zwischen zwei Endlagen hin und her bewegbar ist. Die jeweiligen Endlagen sind in den Figuren 2 und 3 dargestellt.
  • In der Figur 2 befindet sich das Drosselventil 30 in einer Endlage, in der es nicht zwischen den Mündungen P und Z angeordnet ist. Daher kann das jeweils eintretende Hydraulikfluid durch die zylindrische Öffnung 28 hindurch ungehindert von der Mündung P zur Mündung Z und umgekehrt fließen. Hier ist also keine Drosselwirkung erzielt.
  • In der gegenüberliegenden Endstellung gemäß Figur 3 ist das Drosselventil 30 zwischen die Mündungspunkte P und Z geschoben, so dass das von P nach Z fließende Hydrauliköl über dieses Drosselventil 30 gedrosselt wird. Das Drosselventil 30 wird erst dann, wenn der Kolben 12 kurz vor dem Endanschlag ist, in die Endposition gemäß Figur 3 gedrückt. Hierzu dient ein mechanisch bedienbarer Stößel 32, der auf einem im Gehäuse 26 verschieblich gelagerten Ventilkolben die Bewegung überträgt. Dabei kann der Stößel beispielsweise durch eine Greifmechanik eines Baufahrzeuges oder eines Umschlagfahrzeuges, beispielsweise einem Holzgreifer betätigt werden. Diese Betätigung ist kinematisch so geschaltet, dass sie erst kurz vor Erreichen des Endanschlags erfolgt und damit erst zu diesem Zeitpunkt zur Dämpfung führt.
  • Wird das Steuerventil nun auf Position A geschaltet, wird das ringseitige Hydraulikvolumen aus der Mündung B gedrückt, obwohl sich der Ventilkolben 34 in seiner in Figur 3 gezeigten Endlage befindet, kann das Hydraulikfluid über ein im Drosselventil 30 integriertes Rückschlagventil 36 ungehindert abfließen, bis der Ventilkolben 34 den Zylinderraum 28 genügend geöffnet hat. Dadurch wird ein verzögerungsfreies Anfahren des Hydraulikzylinders 10 nach dem Umschalten gewährleistet.
  • Die in dem zylindrischen Raum 28 vorherrschenden Drücke bewirken, dass der Ventilkolben 34 immer in der in Figur 2 gezeigten Endlage verbleibt, es sei denn, dass er über den Stößel 32 in Richtung der Endlage gemäß Figur 3 zwangsverschoben wird.

Claims (3)

  1. Hydraulikzylinder (10) mit einem Kolben (12) mit Kolbenstange (14), wobei am Hydraulikzylinder (10) zwei Hydraulikleitungen (16, 18) mit einem Steuerventil (22) anschließen, wobei in mindestens einer Hydraulikleitung (18) ein schaltbares Drosselventil (30) eingesetzt ist, das von einer Stellung, in der das Hydraulikfluid ungehindert strömen kann in eine Stellung, in der das Drosselventil (24) wirksam ist, umstellbar ist wobei das Drosselventil (24) aus einer in einem Gehäuse (26) über einen Stößel (32) verschiebbaren Ventileinheit besteht, die durch Betätigung des Stößels (32) in den Fluidweg des Hydraulikfluids bewegbar ist, um in dieser Position den Hydraulikfluidvolumenstrom zu drosseln,
    dadurch gekennzeichnet,
    dass der Stößel (32) von einer Greifermechanik einer Bau- oder Umschlagmaschine beaufschlagbar ist.
  2. Hydraulikzylinder nach Anspruch 1, dadurch gekennzeichnet, dass in dem Drosselventil ein Rückschlagventil integriert ist.
  3. Bau- oder Umschlagmaschine mit mindestens einem Hydraulikzylinder (10) nach einem der vorgenannten Ansprüche.
EP06017903.3A 2005-12-05 2006-08-28 Hydraulikzylinder mit Endlagendämpfung Active EP1793050B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200520018999 DE202005018999U1 (de) 2005-12-05 2005-12-05 Hydraulikzylinder mit Endlagendämpfung

Publications (3)

Publication Number Publication Date
EP1793050A2 EP1793050A2 (de) 2007-06-06
EP1793050A3 EP1793050A3 (de) 2011-08-03
EP1793050B1 true EP1793050B1 (de) 2015-10-14

Family

ID=37600749

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06017903.3A Active EP1793050B1 (de) 2005-12-05 2006-08-28 Hydraulikzylinder mit Endlagendämpfung

Country Status (2)

Country Link
EP (1) EP1793050B1 (de)
DE (1) DE202005018999U1 (de)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB519321A (en) * 1937-09-29 1940-03-21 Vickers Inc Improvements in hydraulic feed control system
JPS57161307A (en) * 1981-09-28 1982-10-04 Amada Co Ltd Adjusting device of stroke in cylinder mechanism
US4915014A (en) * 1985-05-08 1990-04-10 Deere & Company Disk harrow hydraulic wing balancing system
DE20114538U1 (de) * 2001-09-03 2001-10-31 Kuepper Weisser Gmbh Hydrauliksystem für die Eigengewichtsentlastung von Anbaugeräten
WO2002014698A1 (en) * 2000-08-15 2002-02-21 Parker Hannifin Ab Pneumatic actuator system
WO2004099626A1 (en) * 2003-05-07 2004-11-18 G.Fluid S.R.L. Pilote check valve with variable throttle
WO2005005843A1 (de) * 2003-07-10 2005-01-20 Hydac System Gmbh Fluidkühlvorrichtung

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3465519A (en) * 1967-08-18 1969-09-09 Webster Electric Co Inc Hydraulic flow controlling apparatus
WO1991000432A1 (en) * 1989-06-26 1991-01-10 Kabushiki Kaisha Komatsu Seisakusho Hydraulic circuit
FR2699609B1 (fr) * 1992-12-22 1995-02-10 Hydromo Procédé et dispositif pour la mise en mouvement ou l'arrêt d'un moteur hydraulique entraînant un ensemble présentant une grande inertie.
US6868672B2 (en) * 2003-05-13 2005-03-22 Sauer-Danfoss, Inc. Method of controlling a swinging boom and apparatus for controlling the same

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB519321A (en) * 1937-09-29 1940-03-21 Vickers Inc Improvements in hydraulic feed control system
JPS57161307A (en) * 1981-09-28 1982-10-04 Amada Co Ltd Adjusting device of stroke in cylinder mechanism
US4915014A (en) * 1985-05-08 1990-04-10 Deere & Company Disk harrow hydraulic wing balancing system
WO2002014698A1 (en) * 2000-08-15 2002-02-21 Parker Hannifin Ab Pneumatic actuator system
DE20114538U1 (de) * 2001-09-03 2001-10-31 Kuepper Weisser Gmbh Hydrauliksystem für die Eigengewichtsentlastung von Anbaugeräten
WO2004099626A1 (en) * 2003-05-07 2004-11-18 G.Fluid S.R.L. Pilote check valve with variable throttle
WO2005005843A1 (de) * 2003-07-10 2005-01-20 Hydac System Gmbh Fluidkühlvorrichtung

Also Published As

Publication number Publication date
EP1793050A3 (de) 2011-08-03
EP1793050A2 (de) 2007-06-06
DE202005018999U1 (de) 2007-04-12

Similar Documents

Publication Publication Date Title
DE2513302C2 (de) Blockierbare pneumatische oder hydropneumatische Feder
DE3713997C2 (de) Hydropneumatischer Verbundzylinder
EP1621793A1 (de) Gasfeder
DE602005006386T2 (de) Mehrstufiger Teleskopausleger.
DE102010022286A1 (de) Luftdämpfungsmechanismus für einen Pneumatikzylinder
DE1778952C3 (de) Hydraulische Formschließvorrichtung für eine Kunststoff-Spritzgießmaschine
DE4035286C2 (de) Anschlag mit einer Dämpfungseinrichtung
AT401510B (de) Ladekran
WO1997035114A1 (de) Hydropneumatische werkzeugmaschine
EP0505349B2 (de) Hydraulische Zylinder/Kolben-Anordnung
EP1793050B1 (de) Hydraulikzylinder mit Endlagendämpfung
DE2322354A1 (de) Arbeitszylinder, insbesondere hydraulikzylinder, mit einer daempfungseinrichtung fuer das ende des arbeitshubes des kolbens
EP3085275B1 (de) Schwenkanordnung
CH649484A5 (de) Vertikal-druckgiessmaschine mit einem rueckzugszylinderaggregat.
DE102011101019A1 (de) Mehrstufiger Druckmittelzylinder
WO2004018120A1 (de) Haupt- bzw. presszylinder einer rohr- und strangpresse
DE102008060650A1 (de) Ventil mit Endlagen-Dämpfungseinrichtung
EP0089568B1 (de) Druckmittelbetätigte Drehantriebs-Stellvorrichtung
DE2510341A1 (de) Ventil mit brems- und daempfungsvorrichtung
DE3801290C1 (en) Tensioning device for a chain or belt drive
AT408851B (de) Hydraulische presse
DE2450330B2 (de) Doppelhydraulischer stellantrieb
DE2900221A1 (de) Druckmittelgetriebene rammvorrichtung
DE2854504A1 (de) Steuerventil
DE112004000191B4 (de) Antrieb für ein Turbinenventil

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA HR MK YU

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA HR MK RS

RIC1 Information provided on ipc code assigned before grant

Ipc: E02F 9/22 20060101AFI20110630BHEP

Ipc: F15B 15/22 20060101ALI20110630BHEP

17P Request for examination filed

Effective date: 20120202

AKX Designation fees paid

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR

17Q First examination report despatched

Effective date: 20120914

REG Reference to a national code

Ref country code: DE

Ref legal event code: R079

Ref document number: 502006014584

Country of ref document: DE

Free format text: PREVIOUS MAIN CLASS: E02F0009220000

Ipc: B66F0009220000

RIC1 Information provided on ipc code assigned before grant

Ipc: B66F 9/22 20060101AFI20150421BHEP

Ipc: F15B 15/22 20060101ALI20150421BHEP

Ipc: F15B 11/048 20060101ALI20150421BHEP

Ipc: E02F 9/22 20060101ALI20150421BHEP

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

INTG Intention to grant announced

Effective date: 20150629

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: AT

Ref legal event code: REF

Ref document number: 754958

Country of ref document: AT

Kind code of ref document: T

Effective date: 20151015

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: LANGUAGE OF EP DOCUMENT: GERMAN

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 502006014584

Country of ref document: DE

REG Reference to a national code

Ref country code: NL

Ref legal event code: MP

Effective date: 20151014

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG4D

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20151014

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20151014

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20160214

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20151014

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20151014

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20151014

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20151014

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20151014

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20151014

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20160115

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20160215

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 502006014584

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20151014

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20151014

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20151014

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20151014

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20151014

26N No opposition filed

Effective date: 20160715

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20151014

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20160831

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20151014

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20160828

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20160831

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20160831

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20170428

REG Reference to a national code

Ref country code: IE

Ref legal event code: MM4A

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20160828

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20160831

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20160828

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20160828

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO

Effective date: 20060828

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20151014

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20151014

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20151014

P01 Opt-out of the competence of the unified patent court (upc) registered

Effective date: 20230607

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 20230824

Year of fee payment: 18

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20230831

Year of fee payment: 18