EP1793050B1 - Hydraulic cylinder with stroke end damping. - Google Patents
Hydraulic cylinder with stroke end damping. Download PDFInfo
- 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
Links
- 238000013016 damping Methods 0.000 title description 9
- 239000012530 fluid Substances 0.000 claims description 11
- 238000010276 construction Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000009420 retrofitting Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2203—Arrangements for controlling the attitude of actuators, e.g. speed, floating function
- E02F9/2214—Arrangements for controlling the attitude of actuators, e.g. speed, floating function for reducing the shock generated at the stroke end
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, 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
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices 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
- B66F9/075—Constructional features or details
- B66F9/20—Means for actuating or controlling masts, platforms, or forks
- B66F9/22—Hydraulic devices or 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
- 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
- F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
- F15B11/046—Systems 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
- F15B11/048—Systems 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
-
- 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
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/22—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke
-
- 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
- F15B2211/40—Flow control
- F15B2211/405—Flow control characterised by the type of flow control means or valve
- F15B2211/40515—Flow control characterised by the type of flow control means or valve with variable throttles or orifices
-
- 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
- F15B2211/40—Flow control
- F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
- F15B2211/41527—Flow control characterised by the connections of the flow control means in the circuit being connected to an output member and a directional control valve
-
- 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
- F15B2211/40—Flow control
- F15B2211/42—Flow control characterised by the type of actuation
- F15B2211/421—Flow control characterised by the type of actuation mechanically
- F15B2211/424—Flow control characterised by the type of actuation mechanically actuated by an output member of the circuit
-
- 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
- F15B2211/40—Flow control
- F15B2211/455—Control of flow in the feed line, i.e. meter-in control
-
- 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
- F15B2211/755—Control of acceleration or deceleration of the output member
-
- 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
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/85—Control during special operating conditions
- F15B2211/853—Control 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.
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- 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.The invention relates to a hydraulic cylinder with a piston and a piston rod according to the preamble of claim 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.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.
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.A disadvantage of these solutions is that the respective hydraulic cylinder must be structurally equipped with the end position damping from the outset. The means that retrofitting of simple series hydraulic cylinders is not possible. Rather, already existing series hydraulic cylinder must be replaced by the specially designed hydraulic cylinder with cushioning.
Ein solcher Hydraulikzylinder ist aus
Aufgabe der Erfindung ist es nun, konventionelle Hydraulikzylinder optional mit einer bodenseitigen Dämpfung auszustatten. Dabei sollen sich Serienhydraulikzylinder ohne Endlagendämpfung entsprechend umrüsten lassen.The object of the invention is now to equip conventional hydraulic cylinder optionally with a bottom-side damping. Here are series hydraulic cylinders without end cushioning to convert accordingly.
Erfindungsgemäß wird diese Aufgabe durch einen Hydraulikzylinder mit den Merkmalen des Anspruchs 1 gelöst.According to the invention, this object is achieved by a hydraulic cylinder having the features of claim 1.
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.This solution makes it possible to retrofit series hydraulic cylinders with a cushioning system. This is due to the fact that the hydraulic cylinder used does not need to be changed. This also eliminates the additional provision of a new hydraulic cylinder for spare parts needs. The user can decide at any time whether he wants a cushioning or not. As far as the throttle valve is arranged on the hydraulic fluid inlet side, a hydraulic cylinder gentle and energy-efficient damping principle can be done by throttling the hydraulic cylinder inlet fluid.
Vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus den sich an den Hauptanspruch anschließenden Unteransprüchen.Advantageous embodiments of the invention will become apparent from the subsequent claims to the main claim.
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.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.
Damit die Endlagendämpfung nur beim Hubende wirkt, ist im Drosselventil ein Rückschlagventil integriert, über das die Endlagendämpfung bei Hubbeginn umgangen werden kann.Thus, 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.
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.According to the invention, 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. This ensures that the movement of the piston in the hydraulic cylinder is effective only in a desired end. For example, an end cushioning in a hydraulic cylinder, which is used for a timber grab, are provided.
Es wird eine Bau- oder Umschlagmaschine mit mindestens einem Hydraulikzylinder entsprechend dem vorher beschriebenen Aufbau gesondert unter Schutz gestellt.It is a construction or handling machine with at least one hydraulic cylinder according to the structure described above separately provided under protection.
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.
- FIG. 1:
- FIG. 2 is a schematic diagram of the schematically illustrated hydraulic cylinder according to an embodiment of the present invention. FIG.
- FIG. 2:
- in the hydraulic line of the hydraulic cylinder according to
FIG. 1 built-in throttle valve in a first end position and - FIG. 3:
- the aforementioned throttle valve in another end position.
In der
In der
In der gegenüberliegenden Endstellung gemäß
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
Die in dem zylindrischen Raum 28 vorherrschenden Drücke bewirken, dass der Ventilkolben 34 immer in der in
Claims (3)
- A hydraulic cylinder (10) comprising a piston (12) having a piston rod (14), wherein two hydraulic lines (16, 18) having a control valve (22) adjoin the hydraulic cylinder (10); wherein a switchable butterfly valve (30) is inserted in at least one hydraulic line (18) and is switchable from a position in which the hydraulic fluid can flow without impediment into a position in which the butterfly valve (24) is active, with the butterfly valve (24) comprising a valve unit which is displaceable in a housing (26) via a plunger (32) and which is movable by actuation of the plunger (32) into the fluid path of the hydraulic fluid to restrict the hydraulic fluid volume flow in this position,
characterized in that
the plunger (32) can be acted on by a gripper mechanism of a construction machine or of a transfer machine. - A hydraulic cylinder in accordance with claim 1, characterized in that a check valve is integrated in the butterfly valve.
- A construction machine or transfer machine comprising at least one hydraulic cylinder (10) in accordance with one of the preceding claims.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200520018999 DE202005018999U1 (en) | 2005-12-05 | 2005-12-05 | Hydraulic cylinder with end position damping |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1793050A2 EP1793050A2 (en) | 2007-06-06 |
EP1793050A3 EP1793050A3 (en) | 2011-08-03 |
EP1793050B1 true EP1793050B1 (en) | 2015-10-14 |
Family
ID=37600749
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06017903.3A Active EP1793050B1 (en) | 2005-12-05 | 2006-08-28 | Hydraulic cylinder with stroke end damping. |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1793050B1 (en) |
DE (1) | DE202005018999U1 (en) |
Citations (7)
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 (en) * | 2001-09-03 | 2001-10-31 | Kuepper Weisser Gmbh | Hydraulic system for the self-weight relief of attachments |
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 (en) * | 2003-07-10 | 2005-01-20 | Hydac System Gmbh | Fluid cooling device |
Family Cites Families (4)
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 (en) * | 1992-12-22 | 1995-02-10 | Hydromo | Method and device for setting in motion or stopping a hydraulic motor driving an assembly with high inertia. |
US6868672B2 (en) * | 2003-05-13 | 2005-03-22 | Sauer-Danfoss, Inc. | Method of controlling a swinging boom and apparatus for controlling the same |
-
2005
- 2005-12-05 DE DE200520018999 patent/DE202005018999U1/en not_active Expired - Lifetime
-
2006
- 2006-08-28 EP EP06017903.3A patent/EP1793050B1/en active Active
Patent Citations (7)
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 (en) * | 2001-09-03 | 2001-10-31 | Kuepper Weisser Gmbh | Hydraulic system for the self-weight relief of attachments |
WO2004099626A1 (en) * | 2003-05-07 | 2004-11-18 | G.Fluid S.R.L. | Pilote check valve with variable throttle |
WO2005005843A1 (en) * | 2003-07-10 | 2005-01-20 | Hydac System Gmbh | Fluid cooling device |
Also Published As
Publication number | Publication date |
---|---|
DE202005018999U1 (en) | 2007-04-12 |
EP1793050A3 (en) | 2011-08-03 |
EP1793050A2 (en) | 2007-06-06 |
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