EP0803630A2 - Hydraulic operating device - Google Patents

Hydraulic operating device Download PDF

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Publication number
EP0803630A2
EP0803630A2 EP97890053A EP97890053A EP0803630A2 EP 0803630 A2 EP0803630 A2 EP 0803630A2 EP 97890053 A EP97890053 A EP 97890053A EP 97890053 A EP97890053 A EP 97890053A EP 0803630 A2 EP0803630 A2 EP 0803630A2
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EP
European Patent Office
Prior art keywords
valve
piston
check valve
cover flap
pressure
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.)
Granted
Application number
EP97890053A
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German (de)
French (fr)
Other versions
EP0803630B1 (en
EP0803630A3 (en
Inventor
Gerhard Dipl.-Ing. Huber
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Hoerbiger Hydraulik GmbH
Original Assignee
Hoerbiger GmbH
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Filing date
Publication date
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Publication of EP0803630A2 publication Critical patent/EP0803630A2/en
Publication of EP0803630A3 publication Critical patent/EP0803630A3/en
Application granted granted Critical
Publication of EP0803630B1 publication Critical patent/EP0803630B1/en
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Classifications

    • 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
    • F15B7/00Systems in which the movement produced is definitely related to the output of a volumetric pump; Telemotors
    • F15B7/005With rotary or crank input
    • F15B7/006Rotary pump input
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B61RAILWAYS
    • B61DBODY DETAILS OR KINDS OF RAILWAY VEHICLES
    • B61D19/00Door arrangements specially adapted for rail vehicles
    • B61D19/02Door arrangements specially adapted for rail vehicles for carriages
    • EFIXED CONSTRUCTIONS
    • E05LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05YINDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
    • E05Y2900/00Application of doors, windows, wings or fittings thereof
    • E05Y2900/50Application of doors, windows, wings or fittings thereof for vehicles
    • EFIXED CONSTRUCTIONS
    • E05LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05YINDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
    • E05Y2900/00Application of doors, windows, wings or fittings thereof
    • E05Y2900/50Application of doors, windows, wings or fittings thereof for vehicles
    • E05Y2900/51Application of doors, windows, wings or fittings thereof for vehicles for railway cars or mass transit vehicles
    • EFIXED CONSTRUCTIONS
    • E05LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05YINDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
    • E05Y2900/00Application of doors, windows, wings or fittings thereof
    • E05Y2900/50Application of doors, windows, wings or fittings thereof for vehicles
    • E05Y2900/53Type of wing
    • E05Y2900/548Trunk lids
    • 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
    • F15B2211/20Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205Systems with pumps
    • F15B2211/2053Type of pump
    • F15B2211/20561Type of pump reversible

Definitions

  • the invention relates to an arrangement for the hydraulic actuation of a cover flap on a vehicle, with at least one double-acting hydraulic working cylinder, which is articulated on the one hand on the vehicle and on the other hand on the cover flap and the working spaces of which are each connected to one side of a switchable pressure source via a check valve, the two check valves have a mutual unlocking device and the two working spaces are connected in parallel to the check valves via a preload valve.
  • Such arrangements are known (see e.g. DE 43 34 843 A1) and enable, for example, the automatic actuation of vehicle doors, bonnets, maintenance flaps or also cover flaps of the trunk or a space accommodating a folding top.
  • the mutually unlockable non-return valves ensure that when the operating pressure is switched off or fails, the cover flap remains hydraulically locked in the respective position in order to eliminate uncontrolled movements and the associated dangers.
  • the preload valve enables the cover flap to be moved further in a controlled manner in this state, for example by hand, in order, for example, to permit emergency closing against a force specified by the preload valve.
  • a disadvantage of the known arrangement of the type mentioned is in particular the fact that the emergency actuation described is only possible in connection with a volume-balanced working cylinder, since there are otherwise problems with the removal or supply of hydraulic medium to the piston-side or rod-side working space.
  • a simple control of the excess volume pushed out of the respective work area into the tank would still be possible - but there are problems with the supply of hydraulic medium to the other work area without pressure in an emergency, since on the one hand very thin, flexible lines are used for the application in vehicles which, on the other hand, are also due to the crowded accommodation options are relatively long, so that the after-sucking work space is at least partially filled with outgassing air. This then leads to the fact that after the manually operated cover flap has been left out, it can fall back undefined and cause damage and injuries.
  • the object of the present invention is to improve a known arrangement of the type described in the introduction in such a way that the disadvantages described are avoided and that, in particular in a simple and safe manner, an emergency actuation of the cover flap also in the case of the usual volumes of the working spaces which differ on the piston and rod side having working cylinders is possible.
  • a non-return valve is arranged parallel to the bias valve opening when a preferably adjustable piston-side pressure level in the direction of the rod-side working chamber is exceeded, which opens when the pressure is applied accordingly in the direction of the piston-side working chamber.
  • a parallel arrangement of the throttle point and the check valve opening in the direction of the piston-side working chamber can be connected between the preload valve and the piston-side working chamber.
  • this retracts the retraction or insertion of the working cylinder, also and especially in the case of emergency actuation via the throttle point of the parallel arrangement, in addition to the preload valve that specifies a threshold, and on the other hand, the parallel kickback ensures that the working cylinder is extended and pushed out practically hydraulically in the event of an emergency actuation will.
  • a switchable seat valve is switched on.
  • this seat valve In the closed position in normal operation, this seat valve enables hydraulically completely separate control of the two work spaces - in emergency operation, the seat valve is open, which means that the described options for emergency actuation are unimpeded.
  • a preferably adjustable throttle point can be switched on on the control side of the emergency valve, which allows influencing the movement behavior of the working cylinder which is actuated for the first time in the direction of retracting in the manner described above.
  • a preferably adjustable throttle point is arranged in the connection between the rod-side work space and the associated unlockable check valve, which, in a simple manner during hydraulic closing due to the pressure drop, reliably opens the hydraulically unlockable check valve on the piston side guaranteed.
  • FIG. 1 shows a schematic arrangement according to the present invention in a vehicle
  • FIGS. 2 to 6 show a partially schematic, hydraulic circuit diagram of an arrangement according to the invention in various functional states.
  • FIG. 1 for the hydraulic actuation of a cover flap 1 on a vehicle 2 has at least one double-acting hydraulic working cylinder 3 which is articulated on the one hand on the vehicle 2 and on the other hand on the cover flap 1.
  • the working spaces of the working cylinder 3, not shown here, are connected via lines 4, 5 to a hydraulic unit 6, which is connected via a connecting line 7 to the electrical system of the vehicle 2 is connected.
  • the two working spaces 8, 9 of the working cylinder 3 are connected via the lines 4, 5 and a check valve 10, 11 arranged in the hydraulic unit 6, each with one side of a switchable pressure source 12 (here formed from a pump including the drive motor).
  • the two check valves 10, 11 are connected via lines 13, 14 and can be unlocked from each other.
  • the two working spaces 8, 9 are connected in parallel to the check valves 10, 11 via a preload valve 15.
  • an emergency valve 17 which switches off when an adjustable pressure level to the tank 16 is exceeded is switched on and can be hydraulically shut off via a line 18 and the pressure prevailing on the pump side in front of the non-return valve 10.
  • a non-return valve 19 is arranged parallel to the preload valve 15 which opens when a preferably adjustable piston-side pressure level in the direction of the rod-side working chamber 9 is opened, which opens when the pressure is applied accordingly in the direction of the piston-side working chamber 8.
  • a parallel arrangement of throttle point 20 and check valve 21 opening in the direction of the piston-side working chamber 8 is also connected between the preload valve 15 and the piston-side working chamber 8.
  • an electrically switchable seat valve 22 is switched on, with which the two working spaces 8, 9 can be completely separated.
  • a preferably adjustable further throttle point 23 is switched on on the control side of the emergency valve 17.
  • a further, preferably adjustable, further throttle point 24 is finally arranged in the connection between the rod-side working space 9 and the associated unlockable check valve 11.
  • Fig. 2 Hydraulic opening; Working cylinder 3 extends
  • the motor of the pump of the pressure source 12 is energized, the pump runs and supplies pressure medium via the check valves 10 and 21 into the piston-side working chamber 8.
  • the seat valve 22 is also energized, which, as shown, the connection to the rod-side working chamber 9 is interrupted.
  • the emergency valve 17 is controlled via the line 18.
  • the pressure in the piston-side working space 8 can build up to the required value.
  • the cover flap 1 (FIG. 1) opens hydraulically up to the stop in the working cylinder 3.
  • the volume of the rod-side working space 9 flows through the check valve 11, which is hydraulically actuated via the line 14, and the shuttle valve 25 into the tank 16.
  • the hydraulic system delivers the total pressure on the pressure relief valve 26 adjustable force.
  • the pump runs until the cover flap 1 is open and is then switched off.
  • the seat valve 22 is also de-energized after the hydraulic opening, after which the cover flap 1 is held in the open position by the pressure which can be set on the emergency valve 17.
  • Fig. 3 Hydraulic closing; Working cylinder 3 retracts
  • the closing process described below can be divided into three phases, for example - apart from that, it is of course also possible to drive the entire closing process in only one phase, for example as shown in FIG. 3, or to omit the third phase described below.
  • the motor of the pump of the pressure source 12 is energized, in which case pressure medium is now conveyed into the rod-side working space 9 via the check valve 11 and the throttle point 24.
  • the seat valve 22 is in turn energized and closed.
  • the lid 1 closes with an adjustable force on the pressure relief valve 27.
  • the seat valve 22 blocks the connection to the piston-side working space 8. The volume flowing out of this flows because of the blocked backstroke 21 via the throttle point 20 and the check valve 10 via line 13 and the shuttle valve 25 into the tank 16.
  • the throttle point 24 brings about a safe opening of the check valve 10 due to the improved pressure build-up.
  • the closing force is set so that the cover flap 1 (Fig. 1) closes securely even when the associated vehicle is tilted or other unfavorable conditions. On the other hand, the closing force can not be set higher than on the pressure relief valve 27, which can easily be realized that the cover flap 1 can also be stopped by hand if necessary.
  • the motor of the pressure source 12 and the seat valve 22 can in turn remain de-energized for safety reasons, so that the cover flap 1 according to FIG. 1 only sinks to the completely closed position due to its own weight. In the event of a stop, only the weight of the cover flap 1 occurs, thus eliminating any risk of injury.
  • the flowing volume flow from the piston-side working chamber 8 flows partly through the throttle point 20, the then opened seat valve 22 and the bias valve 15 into the rod-side working chamber 9 and partly through the prestressed emergency valve 17 and the throttle point 23 into the tank 16 the filling of the rod-side working space 9 noises in the hydraulics are prevented when the cover flap 1 is subsequently reopened.
  • the throttle point 20 brakes the closing movement of the cover flap 1 as a function of the speed, which further reduces the risk of injury.
  • the emergency valve 17 counteracts the relatively strong counterforce of the cover flap 1 in this phase. With the throttle point 23, further fine-tuning of the closing speed of the cover flap 1 can be carried out.
  • the motor of the pump of the pressure source 12 is de-energized.
  • the seat valve 22 is energized only briefly until the cover flap 1 is braked or has come to a standstill. Thereafter, the seat valve 22 is switched off, which is very advantageous in terms of energy consumption, for example of a vehicle battery.
  • This stop function can take place at any time in the area of the first two phases of closing described above.
  • the cover flap 1 is held by the pressure set on the emergency valve 17. In the arrangement of the cover flap 1 shown in FIG. 1, no separate stop function is provided in the third phase described above of the complete closing solely by the weight of the cover flap 1. However, this is not a disadvantage since, as described, the cover flap 1 can also be easily stopped by hand in this phase.
  • Fig. 5 Emergency function - opening the cover flap 1 by hand, for example if the pressure source 12 fails due to a lack of power supply.
  • the cover flap 1 can be opened with relatively little effort. Only the weight of the cover flap 1 itself and the flow resistance in the hydraulic system have to be overcome. Gas springs that may be installed in the vehicle and act on the cover flap 1 provide additional support. As can be seen, the pressure medium flows from the rod-side working chamber 9 almost without pressure and therefore with little effort via the check valve 19, the poppet valve 22 and the check valve 21 into the piston-side working chamber 8 and fills it up. This is extremely important so that the cover flap 1 also remains standing after such an emergency actuation and cannot fall back against an air cushion in this work space 8, which could represent a great safety risk. As a result of the negative pressure when the piston-side working space is not filled, air would be released from the pressure medium. The difference volume that is naturally missing in this way when filling the piston-side working space due to the smaller volume of the rod-side working space 9 is only a few percent and is insignificant in terms of safety.
  • Fig. 6 Emergency function - closing the cover flap 1 by hand
  • the volume flow flows from the piston-side working chamber 8 via the throttle point 20, the seat valve 22 and the biasing valve 15 into the rod-side working chamber 9 and fills it up.
  • the throttle point 20 has the function of braking harder if the closing speed is too fast than if the closing speed is slow.
  • the preload valve 15 acts against the weight of the cover flap 1.
  • cover flap 1 for example on a trunk or the bonnet of a car
  • the arrangement according to the invention could of course also be used to actuate tailgates which are vertical in the closed state, for example a station wagon or a bus.
  • Other application examples would be e.g. Vehicle doors, maintenance or ventilation flaps and the like.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Superstructure Of Vehicle (AREA)

Abstract

The operating device uses at least one double-action hydraulic cylinder (3) extending between the vehicle body and the boot lid, each of its pressure spaces (8,9) coupled to a hydraulic pressure source (12) via a non-return valve (10,11). The emergency opening of the boot lid can be facilitated by an emergency valve (17) connected to the line between one of the cylinder spaces (8) and its non-return valve (10), the emergency valve normally held in the closed position.

Description

Die Erfindung betrifft eine Anordnung zur hydraulischen Betätigung einer Abdeckklappe an einem Fahrzeug, mit zumindest einem doppeltwirkenden hydraulischen Arbeitszylinder, der einerseits am Fahrzeug und andererseits an der Abdeckklappe angelenkt ist und dessen Arbeitsräume über je ein Rückschlagventil mit jeweils einer Seite einer umschaltbaren Druckquelle in Verbindung stehen, wobei die beiden Rückschlagventile eine gegenseitige Entsperreinrichtung aufweisen und die beiden Arbeitsräume parallel zu den Rückschlagventilen über ein Vorspannventil verbunden sind.The invention relates to an arrangement for the hydraulic actuation of a cover flap on a vehicle, with at least one double-acting hydraulic working cylinder, which is articulated on the one hand on the vehicle and on the other hand on the cover flap and the working spaces of which are each connected to one side of a switchable pressure source via a check valve, the two check valves have a mutual unlocking device and the two working spaces are connected in parallel to the check valves via a preload valve.

Derartige Anordnungen sind bekannt (siehe z.B. DE 43 34 843 A1) und ermöglichen beispielsweise die automatische Betätigung von Fahrzeugtüren, Motorhauben, Wartungsklappen oder auch von Abdeckklappen des Kofferraumes oder eines ein Faltverdeck aufnehmenden Raumes. Durch die gegenseitig entsperrbaren Rückschlagventile wird sichergestellt, daß beim Ausschalten oder Ausfallen des Betriebsdruckes die Abdeckklappe in der jeweiligen Stellung hydraulisch gesperrt stehenbleibt, um unkontrollierte Bewegungen und damit einhergehende Gefahren auszuschalten. Das Vorspannventil ermöglicht eine kontrollierte Weiterbewegung der Abdeckklappe in diesem Zustand beispielsweise von Hand aus, um etwa ein Not-Schließen gegen eine vom Vorspannventil vorgegebene Kraft zu erlauben.Such arrangements are known (see e.g. DE 43 34 843 A1) and enable, for example, the automatic actuation of vehicle doors, bonnets, maintenance flaps or also cover flaps of the trunk or a space accommodating a folding top. The mutually unlockable non-return valves ensure that when the operating pressure is switched off or fails, the cover flap remains hydraulically locked in the respective position in order to eliminate uncontrolled movements and the associated dangers. The preload valve enables the cover flap to be moved further in a controlled manner in this state, for example by hand, in order, for example, to permit emergency closing against a force specified by the preload valve.

Nachteilig bei der angeführten bekannten Anordnung der genannten Art ist insbesonders der Umstand, daß die beschriebene Notbetätigung nur im Zusammenhang mit einem volumsausgeglichenen Arbeitszylinder möglich ist, da es ansonsten Probleme mit dem Entfernen bzw. Zuführen von Hydraulikmedium zum kolben- bzw. stangenseitigen Arbeitsraum gibt. Ein einfaches Absteuern des überschüssigen, aus dem jeweiligen Arbeitsraum ausgeschobenen Volumens in den Tank wäre zwar noch möglich - Probleme gibt es aber mit dem im Notfall drucklosen Nachliefern von Hydraulikmedium in den anderen Arbeitsraum, da für die Anwendung in Fahrzeugen einerseits sehr dünne, flexible Leitungen verwendet werden müssen, die andererseits auch zufolge der gedrängten Unterbringungsmöglichkeiten relativ lang sind, sodaß der nachsaugende Arbeitsraum zumindest zum Teil mit ausgasender Luft gefüllt wird. Dies führt dann dazu, daß nach dem Auslassen der händisch notbetätigten Abdeckklappe diese undefiniert zurückfallen und Beschädigungen und Verletzungen hervorrufen kann.A disadvantage of the known arrangement of the type mentioned is in particular the fact that the emergency actuation described is only possible in connection with a volume-balanced working cylinder, since there are otherwise problems with the removal or supply of hydraulic medium to the piston-side or rod-side working space. A simple control of the excess volume pushed out of the respective work area into the tank would still be possible - but there are problems with the supply of hydraulic medium to the other work area without pressure in an emergency, since on the one hand very thin, flexible lines are used for the application in vehicles which, on the other hand, are also due to the crowded accommodation options are relatively long, so that the after-sucking work space is at least partially filled with outgassing air. This then leads to the fact that after the manually operated cover flap has been left out, it can fall back undefined and cause damage and injuries.

Aufgabe der vorliegenden Erfindung ist es, eine bekannte Anordnung der eingangs beschriebenen Art so zu verbessern, daß die beschriebenen Nachteile vermieden werden und daß insbesonders auf einfache und sichere Weise eine Notbetätigung der Abdeckklappe auch bei den üblichen, auf Kolben- und Stangenseite unterschiedliche Volumina der Arbeitsräume aufweisenden Arbeitszylindern möglich wird.The object of the present invention is to improve a known arrangement of the type described in the introduction in such a way that the disadvantages described are avoided and that, in particular in a simple and safe manner, an emergency actuation of the cover flap also in the case of the usual volumes of the working spaces which differ on the piston and rod side having working cylinders is possible.

Diese Aufgabe wird bei einer Anordnung der eingangs genannten Art gemäß der Erfindung dadurch gelöst, daß zwischen kolbenseitigem Arbeitsraum und entsperrbarem Rückschlagventil ein bei Überschreitung eines einstellbaren Druckniveaus zum Tank absteuerndes Notventil eingeschaltet ist, das über den pumpenseitig vor dem zugehörigen Rückschlagventil herrschenden Druck hydraulisch absperrbar ist. Bei einem Ausfall des hydraulischen Arbeitsdruckes ist damit weiterhin eine einfache und sichere Notbetätigung der Abdeckklappe beispielsweise von Hand aus möglich. Bei dabei von Hand ausgezogenem Arbeitszylinder wird das stangenseitige Arbeitsraumvolumen in den volumsmäßig größeren kolbenseitigen Arbeitsraum übergeschoben, wobei das fehlende Differenzvolumen im kolbenseitigen Arbeitsraum in Form von ausgasender Luft in Kauf genommen werden kann, da dieses üblicherweise nur wenige Prozent des Volumens ausmacht und die damit gegebene Möglichkeit der geringfügigen Bewegung der Abdeckklappe gegen diesen kleinen Luftpolster nicht stört. Bei von Hand eingeschobenem Arbeitszylinder wird der stangenseitige Arbeitsraum vom volumsmäßig größeren kolbenseitigen Arbeitsraum her vollständig befülltdas überschüssige Volumen wird bei der ersten derartigen Notbetätigung über das Notventil in den Tank abgesteuert. Bei anschließenden weiteren Notbetätigungen wird in beiden Fällen einfach ein entsprechendes Überschieben zwischen den Arbeitsräumen erfolgen, wobei wiederum die oben beschriebene kleine Differenzmenge jeweils auf der Kolbenseite fehlt bzw. in Kauf genommen wird. Es ergibt sich damit eine sehr einfache und sichere Möglichkeit für eine Notbetätigung beliebig ausgebildeter Arbeitszylinder.This object is achieved in an arrangement of the type mentioned according to the invention in that between the piston-side working space and the unlockable check valve an emergency valve which switches to the tank when an adjustable pressure level is exceeded is switched on and can be hydraulically shut off via the pressure prevailing on the pump side in front of the associated check valve. If the hydraulic working pressure fails, a simple and safe emergency actuation of the cover flap is still possible, for example by hand. When the working cylinder is pulled out by hand, the rod-side working space volume is pushed into the larger-volume piston-side working space, whereby the missing differential volume in the piston-side working space can be accepted in the form of outgassing air, since this usually only makes up a few percent of the volume and the possibility that this gives the slight movement of the cover flap against this small air cushion does not interfere. When the working cylinder is pushed in by hand, the rod-side working chamber is completely filled from the larger piston-side working chamber; the excess volume is discharged into the tank via the emergency valve during the first emergency actuation of this type. With subsequent further emergency operations, a corresponding pushing is simply carried out in both cases between the work rooms, again the small difference described above is missing or accepted on the piston side. This results in a very simple and safe possibility for emergency actuation of arbitrarily designed working cylinders.

In bevorzugter Ausgestaltung der Erfindung ist vorgesehen, daß parallel zu dem bei Überschreitung eines vorzugsweise einstellbaren kolbenseitigen Druckniveaus in Richtung zum stangenseitigen Arbeitsraum öffnenden Vorspannventil ein Rückschlagventil angeordnet ist, welches bei entsprechender Druckbeaufschlagung in Richtung zum kolbenseitigen Arbeitsraum öffnet. Damit kann beispielsweise bei mit ausfahrendem Arbeitszylinder öffnender Abdeckklappe sehr einfach erreicht werden, daß ein Not-Öffnen von Hand erleichtert wird, da das geöffnete Rückschlagventil eine Notbetätigung in Richtung ausfahrender Kolbenstange unter Umgehung des Vorspannventils praktisch ungehindert ermöglicht. Je nach Einstellung des Öffnungsdruckes des Vorspannventils kann der zu betätigende Deckel in unterschiedlichen Stellungen gegen die Wirkung der Schwerkraft abgestützt werden, wobei die eingestellte Druckschwelle allerdings auch mittelbar Einfluß auf die zur Notbetätigung erforderliche Schließkraft hat.In a preferred embodiment of the invention it is provided that a non-return valve is arranged parallel to the bias valve opening when a preferably adjustable piston-side pressure level in the direction of the rod-side working chamber is exceeded, which opens when the pressure is applied accordingly in the direction of the piston-side working chamber. This can be achieved very easily, for example, when the cover flap opens with the working cylinder extending, that an emergency opening by hand is facilitated, since the opened check valve enables emergency actuation in the direction of the extending piston rod bypassing the preload valve practically unhindered. Depending on the setting of the opening pressure of the preload valve, the cover to be actuated can be supported in various positions against the effect of gravity, the pressure threshold set, however, also having an indirect influence on the closing force required for emergency actuation.

Nach einer weiteren Ausgestaltung der Erfindung kann zwischen Vorspannventil und kolbenseitigem Arbeitsraum eine Parallelanordnung von Drosselstelle und in Richtung kolbenseitigem Arbeitsraum öffnendem Rückschlagventil eingeschaltet sein. Damit kann einerseits das Einfahren bzw. Einschieben des Arbeitszylinders, auch und besonders bei Notbetätigung über die Drosselstelle der Parallelanordnung zusätzlich zu dem eine Schwelle vorgebenden Vorspannventil gebremst werden und andererseits durch den parallelen Rückschlag weiterhin ein hydraulisch praktisch ungehindertes Ausfahren bzw. Ausschieben des Arbeitszylinders bei Notbetätigung sichergestellt werden.According to a further embodiment of the invention, a parallel arrangement of the throttle point and the check valve opening in the direction of the piston-side working chamber can be connected between the preload valve and the piston-side working chamber. On the one hand, this retracts the retraction or insertion of the working cylinder, also and especially in the case of emergency actuation via the throttle point of the parallel arrangement, in addition to the preload valve that specifies a threshold, and on the other hand, the parallel kickback ensures that the working cylinder is extended and pushed out practically hydraulically in the event of an emergency actuation will.

In besonders bevorzugter weiterer Ausgestaltung der Erfindung kann vorgesehen sein, daß in die Verbindung der beiden Arbeitsräume, vorzugsweise zwischen den beiden Parallelanordnungen von Vorspannventil und Rückschlag einerseits und Drosselstelle und Rückschlag andererseits, ein bedarfsweise schaltbares Sitzventil eingeschaltet ist. Dieses Sitzventil ermöglicht in der im Normalbetrieb geschlossenen Stellung ein hydraulisch völlig getrenntes Ansteuern der beiden Arbeitsräume - im Notbetrieb ist das Sitzventil offen, wodurch die beschriebenen Möglichkeiten der Notbetätigung unbehindert gegeben sind.In a particularly preferred further embodiment of the invention it can be provided that preferably in the connection of the two work spaces Between the two parallel arrangements of preload valve and check valve on the one hand and throttle point and check valve on the other hand, a switchable seat valve is switched on. In the closed position in normal operation, this seat valve enables hydraulically completely separate control of the two work spaces - in emergency operation, the seat valve is open, which means that the described options for emergency actuation are unimpeded.

Auf der Absteuerseite des Notventils kann in weiterer Ausgestaltung der Erfindung eine vorzugsweise einstellbare Drosselstelle eingeschaltet sein, welche eine Beeinflussung des Bewegungsverhaltens des auf oben beschriebene Weise erstmals in Richtung Einfahren notbetätigten Arbeitszylinders erlaubt.In a further embodiment of the invention, a preferably adjustable throttle point can be switched on on the control side of the emergency valve, which allows influencing the movement behavior of the working cylinder which is actuated for the first time in the direction of retracting in the manner described above.

Nach einer anderen bevorzugten Weiterbildung der Erfindung kann schließlich vorgesehen sein, daß in der Verbindung zwischen stangenseitigem Arbeitsraum und zugehörigem entsperrbaren Rückschlagventil eine vorzugsweise einstellbare Drosselstelle angeordnet ist, welche auf einfache Weise beim hydraulischen Schließen infolge des Druckabfalles ein sicheres Aufsteuern des hydraulisch entsperrbaren Rückschlagventils an der Kolbenseite gewährleistet.According to another preferred development of the invention, it can finally be provided that a preferably adjustable throttle point is arranged in the connection between the rod-side work space and the associated unlockable check valve, which, in a simple manner during hydraulic closing due to the pressure drop, reliably opens the hydraulically unlockable check valve on the piston side guaranteed.

Die Erfindung wird im folgenden noch anhand der Zeichnungen näher erläutert. Fig. 1 zeigt dabei eine schematische Anordnung nach der vorliegenden Erfindung in einem Fahrzeug und Fig. 2 bis 6 zeigen einen teilweise schematischen, hydraulischen Schaltplan einer erfindungsgemäßen Anordnung in verschiedenen Funktionszuständen.The invention is explained in more detail below with reference to the drawings. 1 shows a schematic arrangement according to the present invention in a vehicle and FIGS. 2 to 6 show a partially schematic, hydraulic circuit diagram of an arrangement according to the invention in various functional states.

Die in Fig. 1 dargestellt Anordnung zur hydraulischen Betätigung einer Abdeckklappe 1 an einem Fahrzeug 2 weist zumindest einen doppeltwirkenden hydraulischen Arbeitszylinder 3 auf, der einerseits am Fahrzeug 2 und andererseits an der Abdeckklappe 1 angelenkt ist. Die hier nicht weiter dargestellten Arbeitsräume des Arbeitszylinders 3 sind über Leitungen 4, 5 mit einem Hydraulikaggregat 6 verbunden, welches über eine Anschlußleitung 7 mit dem elektrischen Bordnetz des Fahrzeuges 2 in Verbindung steht.The arrangement shown in FIG. 1 for the hydraulic actuation of a cover flap 1 on a vehicle 2 has at least one double-acting hydraulic working cylinder 3 which is articulated on the one hand on the vehicle 2 and on the other hand on the cover flap 1. The working spaces of the working cylinder 3, not shown here, are connected via lines 4, 5 to a hydraulic unit 6, which is connected via a connecting line 7 to the electrical system of the vehicle 2 is connected.

Anstelle der beidseitigen direkten Anlenkung des Arbeitszylinders 3, welche natürlich entsprechend bewegliche Leitungen 4, 5 oder ein insgesamt mit dem Arbeitszylinder 3 mitbewegbares Hydraulikaggregat 6 erfordert, könnte die Anlenkung des Arbeitszylinders 3 auf der Fahrzeug- und/oder Abdeckklappenseite auch indirekt über Hebel oder dergleichen erfolgen, wobei der Arbeitszylinder 3 auch relativ zum Fahrzeug 2 feststehend montiert sein könnte.Instead of the direct articulation of the working cylinder 3 on both sides, which of course requires correspondingly movable lines 4, 5 or a hydraulic unit 6 which can be moved together with the working cylinder 3, the articulation of the working cylinder 3 on the vehicle and / or cover flap side could also take place indirectly via levers or the like , wherein the working cylinder 3 could also be fixed relative to the vehicle 2.

In den Fig. 2 bis 6 ist die Kombination von Hydraulikaggregat 6 und über die Leitungen 4, 5 verbundenem Arbeitszylinder 3 detaillierter dargestellt.2 to 6, the combination of hydraulic unit 6 and working cylinder 3 connected via lines 4, 5 is shown in more detail.

Die beiden Arbeitsräume 8, 9 des Arbeitszylinders 3 sind über die Leitungen 4, 5 und je ein im Hydraulikaggregat 6 angeordnetes Rückschlagventil 10, 11 mit jeweils einer Seite einer umschaltbaren Druckquelle 12 (hier gebildet aus Pumpe samt Antriebsmotor) in Verbindung. Die beiden Rückschlagventile 10, 11 sind dabei über Leitungen 13, 14 verbunden und gegenseitig entsperrbar. Über ein Vorspannventil 15 sind die beiden Arbeitsräume 8, 9 parallel zu den Rückschlagventilen 10, 11 verbunden. Zwischen kolbenseitigem Arbeitsraum 8 und zugehörigem entsperrbaren Rückschlagventil 10 ist ein bei Überschreitung eines einstellbaren Druckniveaus zum Tank 16 absteuerndes Notventil 17 eingeschaltet, das über eine Leitung 18 und den pumpenseitig vor dem Rückschlagventil 10 herrschenden Druck hydraulisch absperrbar ist. Parallel zu dem bei Überschreitung eines, vorzugsweise einstellbaren, kolbenseitigen Druckniveaus in Richtung zum stangenseitigen Arbeitsraum 9 öffnenden Vorspannventil 15 ist ein Rückschlagventil 19 angeordnet, welches bei entsprechender Druckbeaufschlagung in Richtung zum kolbenseitigen Arbeitsraum 8 öffnet. Zwischen Vorspannventil 15 und kolbenseitigem Arbeitsraum 8 ist weiters eine Parallelanordnung von Drosselstelle 20 und in Richtung kolbenseitigem Arbeitsraum 8 öffnendem Rückschlagventil 21 eingeschaltet. In die Verbindung der beiden Arbeitsräume 8, 9 ist zwischen den beiden Parallelanordnungen von Vorspannventil 15 und Rückschlag 19 einerseits und Drosselstelle 20 und Rückschlag 21 andererseits ein bedarfsweise elektrisch schaltbares Sitzventil 22 eingeschaltet, mit dem die beiden Arbeitsräume 8, 9 vollkommen getrennt werden können. Auf der Absteuerseite des Notventils 17 ist eine vorzugsweise einstellbare weitere Drosselstelle 23 eingeschaltet. Eine ebenfalls vorzugsweise einstellbare weitere Drosselstelle 24 ist schließlich noch in der Verbindung zwischen stangenseitigem Arbeitsraum 9 und zugehörigem entsperrbaren Rückschlagventil 11 angeordnet.The two working spaces 8, 9 of the working cylinder 3 are connected via the lines 4, 5 and a check valve 10, 11 arranged in the hydraulic unit 6, each with one side of a switchable pressure source 12 (here formed from a pump including the drive motor). The two check valves 10, 11 are connected via lines 13, 14 and can be unlocked from each other. The two working spaces 8, 9 are connected in parallel to the check valves 10, 11 via a preload valve 15. Between the piston-side working chamber 8 and the associated unlockable non-return valve 10, an emergency valve 17 which switches off when an adjustable pressure level to the tank 16 is exceeded is switched on and can be hydraulically shut off via a line 18 and the pressure prevailing on the pump side in front of the non-return valve 10. A non-return valve 19 is arranged parallel to the preload valve 15 which opens when a preferably adjustable piston-side pressure level in the direction of the rod-side working chamber 9 is opened, which opens when the pressure is applied accordingly in the direction of the piston-side working chamber 8. A parallel arrangement of throttle point 20 and check valve 21 opening in the direction of the piston-side working chamber 8 is also connected between the preload valve 15 and the piston-side working chamber 8. In the connection of the two working spaces 8, 9 is between the two parallel arrangements of bias valve 15 and check valve 19 on the one hand and throttling point 20 and check valve 21 on the other hand, an electrically switchable seat valve 22 is switched on, with which the two working spaces 8, 9 can be completely separated. A preferably adjustable further throttle point 23 is switched on on the control side of the emergency valve 17. A further, preferably adjustable, further throttle point 24 is finally arranged in the connection between the rod-side working space 9 and the associated unlockable check valve 11.

Die in Fig. 1 ersichtliche Anschlußleitung 7, welche in den Fig. 2 bis 6 nicht separat dargestellt ist, steuert den Motor der Pumpe der Druckquelle 12, das Sitzventil 22 und ein Wechselventil 25 zwischen den über einstellbare Druckbegrenzungsventile 26, 27 zum Tank 16 führenden Leitungen. Weiters könnten über diese Anschlußleitung 7 auch beispielsweise Endschalter oder sonstige Stellungskontrollen Signale zu nicht weiter dargestellten Steuereinheiten oder dergleichen liefern.The connecting line 7 shown in FIG. 1, which is not shown separately in FIGS. 2 to 6, controls the motor of the pump of the pressure source 12, the poppet valve 22 and a shuttle valve 25 between the adjustable pressure relief valves 26, 27 leading to the tank 16 Cables. Furthermore, limit switches or other position controls, for example, could also supply signals to control units (not shown) or the like via this connecting line 7.

Im folgenden wird die Funktion der dargestellten Anordnung anhand der einzelnen Betätigungsphasen wie in den Fig. 2 bis 6 dargestellt erläutert.The function of the arrangement shown is explained below with reference to the individual actuation phases as shown in FIGS. 2 to 6.

1. Fig. 2: Hydraulisches Öffnen; Arbeitszylinder 3 fährt aus1. Fig. 2: Hydraulic opening; Working cylinder 3 extends

Der Motor der Pumpe der Druckquelle 12 ist bestromt, die Pumpe läuft und liefert Durckmedium über die Rückschlagventile 10 und 21 in den kolbenseitigen Arbeitsraum 8. Das Sitzventil 22 ist ebenfalls bestromt, womit wie dargestellt die Verbindung zum stangenseitigen Arbeitsraum 9 unterbrochen ist. Über die Leitung 18 ist das Notventil 17 zugesteuert. Der Druck im kolbenseitigen Arbeitsraum 8 kann sich bis auf den erforderlichen Wert aufbauen. Die Abdeckklappe 1 (Fig. 1) öffnet hydraulisch bis zum Anschlag im Arbeitszylinder 3. Das Volumen des stangenseitigen Arbeitsraumes 9 fließt über das über die Leitung 14 hydraulisch aufgesteuerte Rückschlagventil 11 und das Wechselventil 25 in den Tank 16 ab. Je nach Gegengewicht bzw. Gegenkraft an der Abdeckklappe 1 liefert die Hydraulik insgesamt die am Druckbegrenzungsventil 26 einstellbare Kraft. Die Pumpe läuft bis die Abdeckklappe 1 geöffnet ist und wird dann abgeschaltet. Weiters wird auch das Sitzventil 22 nach dem hydraulischen Öffnen stromlos geschaltet, wonach die Abdeckklappe 1 durch den am Notventil 17 einstellbaren Druck in geöffneter Stellung gehalten wird.The motor of the pump of the pressure source 12 is energized, the pump runs and supplies pressure medium via the check valves 10 and 21 into the piston-side working chamber 8. The seat valve 22 is also energized, which, as shown, the connection to the rod-side working chamber 9 is interrupted. The emergency valve 17 is controlled via the line 18. The pressure in the piston-side working space 8 can build up to the required value. The cover flap 1 (FIG. 1) opens hydraulically up to the stop in the working cylinder 3. The volume of the rod-side working space 9 flows through the check valve 11, which is hydraulically actuated via the line 14, and the shuttle valve 25 into the tank 16. Depending on the counterweight or counterforce on the cover flap 1, the hydraulic system delivers the total pressure on the pressure relief valve 26 adjustable force. The pump runs until the cover flap 1 is open and is then switched off. Furthermore, the seat valve 22 is also de-energized after the hydraulic opening, after which the cover flap 1 is held in the open position by the pressure which can be set on the emergency valve 17.

2. Fig. 3: Hydraulisches Schließen; Arbeitszylinder 3 fährt ein2. Fig. 3: Hydraulic closing; Working cylinder 3 retracts

Der im folgenden beschriebene Schließvorgang kann beispielsweise in drei Phasen unterteilt werden - davon abgesehen ist es aber natürlich auch möglich den ganzen Schließvorgang nur in einer Phase, beispielsweise wie in Fig. 3 dargestellt zu fahren oder aber die untenstehend beschriebene dritte Phase entfallen zu lassen.The closing process described below can be divided into three phases, for example - apart from that, it is of course also possible to drive the entire closing process in only one phase, for example as shown in FIG. 3, or to omit the third phase described below.

In der ersten Phase ist, wie in Fig. 3 zu ersehen, der Motor der Pumpe der Druckquelle 12 bestromt, wobei hier nun Druckmedium über das Rückschlagventil 11 und die Drosselstelle 24 in den stangenseitigen Arbeitsraum 9 gefördert wird. Das Sitzventil 22 ist wiederum bestromt und geschlossen. Der Deckel 1 schließt mit einer am Druckbegrenzungsventil 27 einstellbaren Kraft. Das Sitzventil 22 sperrt die Verbindung zum kolbenseitigen Arbeitsraum 8. Das aus diesem abfließende Volumen fließt wegen des gesperrten Rückschlages 21 über die Drosselstelle 20 und das über die Leitung 13 aufgesteuerte Rückschlagventil 10 sowie das Wechselventil 25 in den Tank 16 ab. Die Drosselstelle 24 bewirkt ein sicheres Aufsteuern des Rückschlagventils 10 zufolge des verbesserten Druckaufbaus. Die Schließkraft wird dabei so eingestellt, daß die Abdeckklappe 1 (Fig. 1) selbst bei Schrägstellung des zugehörigen Fahrzeuges oder sonstigen ungünstigen Bedingungen sicher schließt. Auf der anderen Seite kann die Schließkraft nicht höher als am Druckbegrenzungsventil 27 eingestellt werden, womit leicht realisiert werden kann, daß die Abdeckklappe 1 zur Not auch von Hand noch angehalten werden kann.In the first phase, as can be seen in FIG. 3, the motor of the pump of the pressure source 12 is energized, in which case pressure medium is now conveyed into the rod-side working space 9 via the check valve 11 and the throttle point 24. The seat valve 22 is in turn energized and closed. The lid 1 closes with an adjustable force on the pressure relief valve 27. The seat valve 22 blocks the connection to the piston-side working space 8. The volume flowing out of this flows because of the blocked backstroke 21 via the throttle point 20 and the check valve 10 via line 13 and the shuttle valve 25 into the tank 16. The throttle point 24 brings about a safe opening of the check valve 10 due to the improved pressure build-up. The closing force is set so that the cover flap 1 (Fig. 1) closes securely even when the associated vehicle is tilted or other unfavorable conditions. On the other hand, the closing force can not be set higher than on the pressure relief valve 27, which can easily be realized that the cover flap 1 can also be stopped by hand if necessary.

In einer zweiten Phase des hydraulischen Schließens ist der Motor der Pumpe der Druckquelle 12 noch bestromt, während das Sitzventil 22 unbestromt und damit auf Durchgang geschaltet ist. Dies kann aus Sicherheitsgründen vorgesehen werden, da dadurch ein Anhalten der Abdeckklappe 1 mit wesentlich geringerem Kraftaufwand möglich wird. Da die Druckquelle 12 normal weiter fördert, bleibt eine weitgehend gleichmäßige Abwärtsbewegung erhalten und der stangenseitige Arbeitsraum 9 wird ausreichend nachgefüllt. Bei einem beispielsweise durch ein Hindernis erfolgenden Anhalten der Abdeckklappe 1 fließt der auftretende Pumpenvolumenstrom über das Rückschlagventil 11, das Rückschlagventil 19, das dann geöffnete Sitzventil 22, das über die Leitung 13 aufgesteuerte Rückschlagventil 10 und das Wechselventil 25 in den Tank 16 ab.In a second phase of hydraulic closing, the motor of the pump of the pressure source 12 is still energized, while the seat valve 22 is de-energized and is switched to continuity. This can be provided for safety reasons, since it makes it possible to stop the cover flap 1 with much less effort. Since the pressure source 12 continues to deliver normally, a largely uniform downward movement is maintained and the rod-side working space 9 is sufficiently refilled. When the cover flap 1 stops, for example due to an obstacle, the pump volume flow that occurs flows through the check valve 11, the check valve 19, the then opened seat valve 22, the check valve 10 which is opened via the line 13 and the shuttle valve 25 into the tank 16.

In einer dritten Phase kann wiederum aus Sicherheitsgründen der Motor der Druckquelle 12 und das Sitzventil 22 unbestromt bleiben, womit die Abdeckklappe 1 gemäß Fig. 1 nur durch ihr Eigengewicht bis in die vollkommen geschlossene Stellung sinkt. Bei einem eventuellen Anhalten tritt nur die Gewichtskraft der Abdeckklappe 1 auf, womit eine allfällige Verletzungsgefahr ausgeschaltet wird. Der abfließende Volumenstrom aus dem kolbenseitigen Arbeitsraum 8 fließt zum einen Teil über die Drosselstelle 20, das dann geöffnete Sitzventil 22 und das Vorspannventil 15 in den stangenseitigen Arbeitsraum 9 und zum anderen Teil durch das vorgespannte Notventil 17 und die Drosselstelle 23 in den Tank 16. Durch das Auffüllen des stangenseitigen Arbeitsraumes 9 werden Geräusche in der Hydraulik bei einem anschließenden Wiederöffnen der Abdeckklappe 1 verhindert. Die Drosselstelle 20 bremst in Abhängigkeit von der Geschwindigkeit die Schließbewegung der Abdeckklappe 1, womit die Verletzungsgefahr weiter verringert wird. Das Notventil 17 wirkt in dieser Phase der relativ starken Gegenkraft der Abdeckklappe 1 entgegen. Mit der Drosselstelle 23 können weitere Feinabstimmungen der Schließgeschwindigkeit der Abdeckklappe 1 vorgenommen werden.In a third phase, the motor of the pressure source 12 and the seat valve 22 can in turn remain de-energized for safety reasons, so that the cover flap 1 according to FIG. 1 only sinks to the completely closed position due to its own weight. In the event of a stop, only the weight of the cover flap 1 occurs, thus eliminating any risk of injury. The flowing volume flow from the piston-side working chamber 8 flows partly through the throttle point 20, the then opened seat valve 22 and the bias valve 15 into the rod-side working chamber 9 and partly through the prestressed emergency valve 17 and the throttle point 23 into the tank 16 the filling of the rod-side working space 9 noises in the hydraulics are prevented when the cover flap 1 is subsequently reopened. The throttle point 20 brakes the closing movement of the cover flap 1 as a function of the speed, which further reduces the risk of injury. The emergency valve 17 counteracts the relatively strong counterforce of the cover flap 1 in this phase. With the throttle point 23, further fine-tuning of the closing speed of the cover flap 1 can be carried out.

3. Fig. 4: Stoppfunktion3. Fig. 4: Stop function

Der Motor der Pumpe der Druckquelle 12 ist unbestromt. Das Sitzventil 22 wird nur kurz bestromt, bis die Abdeckklappe 1 abgebremst bzw. zum Stillstand gekommen ist. Danach wird das Sitzventil 22 stromlos geschaltet, was im Hinblick auf den Energieverbrauch z.B. einer Fahrzeugbatterie sehr vorteilhaft ist. Diese Stoppfunktion kann im Bereich der oben beschriebenen beiden ersten Phasen des Schließens jederzeit erfolgen. Die Abdeckklappe 1 wird durch den am Notventil 17 eingestellten Druck gehalten. Bei der in Fig. 1 dargestellten Anordnung der Abdeckklappe 1 ist in der oben beschriebenen dritten Phase des alleine durch das Eigengewicht der Abdeckklappe 1 erfolgenden vollständigen Schließens keine separate Stoppfunktion vorgesehen. Dies ist aber kein Nachteil, da wie beschrieben die Abdeckklappe 1 in dieser Phase auch leicht von Hand angehalten werden kann.The motor of the pump of the pressure source 12 is de-energized. The seat valve 22 is energized only briefly until the cover flap 1 is braked or has come to a standstill. Thereafter, the seat valve 22 is switched off, which is very advantageous in terms of energy consumption, for example of a vehicle battery. This stop function can take place at any time in the area of the first two phases of closing described above. The cover flap 1 is held by the pressure set on the emergency valve 17. In the arrangement of the cover flap 1 shown in FIG. 1, no separate stop function is provided in the third phase described above of the complete closing solely by the weight of the cover flap 1. However, this is not a disadvantage since, as described, the cover flap 1 can also be easily stopped by hand in this phase.

4. Fig. 5: Notfunktion - Öffnen der Abdeckklappe 1 von Hand beispielsweise bei Ausfall der Druckquelle 12 zufolge fehlender Stromversorgung.4. Fig. 5: Emergency function - opening the cover flap 1 by hand, for example if the pressure source 12 fails due to a lack of power supply.

Die Abdeckklappe 1 kann mit relativ geringem Kraftaufwand geöffnet werden. Es sind lediglich die Gewichtskraft der Abdeckklappe 1 selbst sowie die Strömungswiderstände in der Hydraulik zu überwinden. Eventuell im Fahrzeug eingebaute, an der Abdeckklappe 1 angreifende Gasfedern wirken zusätzlich unterstützend. Wie zu ersehen ist, fließt das Druckmedium vom stangenseitigen Arbeitsraum 9 nahezu drucklos und dadurch mit geringem erforderlichen Kraftaufwand über das Rückschlagventil 19, das Sitzventil 22 und das Rückschlagventil 21 in den kolbenseitigen Arbeitsraum 8 und füllt diesen auf. Dies ist außerordentlich wichtig, damit die Abdeckklappe 1 nach einer derartigen Notbetätigung auch stehen bleibt und nicht gegen einen Luftpolster in diesem Arbeitsraum 8 zurückfallen kann, was ein großes Sicherheitsrisiko darstellen könnte. Zufolge des Unterdrucks bei nicht gefülltem kolbenseitigen Arbeitsraum würde nämlich Luft aus dem Druckmedium gelöst. Das auf diese Weise beim Füllen des kolbenseitigen Arbeitsraumes natürlich fehlend Differenzvolumen zufolge des geringeren Volumens des stangenseiten Arbeitsraumes 9 beträgt nur wenige Prozent und ist vom Sicherheitsaspekt her bedeutungslos.The cover flap 1 can be opened with relatively little effort. Only the weight of the cover flap 1 itself and the flow resistance in the hydraulic system have to be overcome. Gas springs that may be installed in the vehicle and act on the cover flap 1 provide additional support. As can be seen, the pressure medium flows from the rod-side working chamber 9 almost without pressure and therefore with little effort via the check valve 19, the poppet valve 22 and the check valve 21 into the piston-side working chamber 8 and fills it up. This is extremely important so that the cover flap 1 also remains standing after such an emergency actuation and cannot fall back against an air cushion in this work space 8, which could represent a great safety risk. As a result of the negative pressure when the piston-side working space is not filled, air would be released from the pressure medium. The difference volume that is naturally missing in this way when filling the piston-side working space due to the smaller volume of the rod-side working space 9 is only a few percent and is insignificant in terms of safety.

5. Fig. 6: Notfunktion - Schließen der Abdeckklappe 1 von Hand5. Fig. 6: Emergency function - closing the cover flap 1 by hand

Dies ist wiederum beispielsweise bei ausgefallenem Pumpenantrieb notwendig. Dabei fließt wie dargestellt der Volumenstrom vom kolbenseitigen Arbeitsraum 8 über die Drosselstelle 20, das Sitzventil 22 und das Vorspannventil 15 in den stangenseitigen Arbeitsraum 9 und füllt diesen auf. Die Drosselstelle 20 hat dabei die Funktion, bei zu schneller Schließgeschwindigkeit stärker zu bremsen als bei langsamer Schließgeschwindigkeit. Das Vorspannventil 15 wirkt gegen das Gewicht der Abdeckklappe 1 unterstützend. Bei einer erstmaligen derartigen Notbetätigung kann der überschüssige Differenzvolumenstrom des Arbeitszylinders 3 über das Notventil 17 abfließen, wobei noch zu erwähnen ist, daß der eingestellte Druck an diesem Notventil 17 höher ist als der am Vorspannventil 15.This is again necessary, for example, if the pump drive fails. As shown, the volume flow flows from the piston-side working chamber 8 via the throttle point 20, the seat valve 22 and the biasing valve 15 into the rod-side working chamber 9 and fills it up. The throttle point 20 has the function of braking harder if the closing speed is too fast than if the closing speed is slow. The preload valve 15 acts against the weight of the cover flap 1. When this type of emergency actuation is carried out for the first time, the excess differential volume flow of the working cylinder 3 can flow out via the emergency valve 17. It should also be mentioned that the pressure set at this emergency valve 17 is higher than that at the preload valve 15.

Abgesehen von der dargestellten und beschriebenen Anordnung und Betätigung einer Abdeckklappe 1 gemäß Fig. 1 (beispielsweise an einem Kofferraum oder der Motorhaube eines PKW) könnte die erfindungsgemäße Anordnung natürlich auch zur Betätigung von im geschlossenen Zustand senkrechten Heckklappen beispielsweise eines Kombi oder eines Busses verwendet werden. Andere Anwendungsbeispiele wären z.B. Fahrzeugtüren, Wartungs- oder Lüftungsklappen und dergleichen mehr.Apart from the illustrated and described arrangement and actuation of a cover flap 1 according to FIG. 1 (for example on a trunk or the bonnet of a car), the arrangement according to the invention could of course also be used to actuate tailgates which are vertical in the closed state, for example a station wagon or a bus. Other application examples would be e.g. Vehicle doors, maintenance or ventilation flaps and the like.

Claims (6)

Anordnung zur hydraulischen Betätigung einer Abdeckklappe an einem Fahrzeug, mit zumindest einem doppeltwirkenden hydraulischen Arbeitszylinder, der einerseits am Fahrzeug und andererseits an der Abdeckklappe angelenkt ist und dessen Arbeitsräume über je ein Rückschlagventil mit jeweils einer Seite einer umschaltbaren Druckquelle in Verbindung stehen, wobei die beiden Rückschlagventile eine gegenseitige Entsperreinrichtung aufweisen und die beiden Arbeitsräume parallel zu den Rückschlagventilen über ein Vorspannventil verbunden sind, dadurch gekennzeichnet, daß zwischen kolbenseitigem Arbeitsraum (8) und entsperrbarem Rückschlagventil (10) ein bei Überschreitung eines einstellbaren Druckniveaus zum Tank (16) absteuerndes Notventil (17) eingeschaltet ist, das über den pumpenseitig vor dem zugehörigen Rückschlagventil (10) herrschenden Druck hydraulisch absperrbar ist.Arrangement for the hydraulic actuation of a cover flap on a vehicle, with at least one double-acting hydraulic working cylinder, which is articulated on the one hand on the vehicle and on the other hand on the cover flap and whose working spaces are connected via a check valve to one side of a switchable pressure source, the two check valves have a mutual unlocking device and the two working spaces are connected parallel to the check valves via a preload valve, characterized in that between the piston-side working space (8) and the unlockable non-return valve (10) an emergency valve (17) which shuts off when an adjustable pressure level to the tank (16) is exceeded is switched on, which can be shut off hydraulically via the pressure prevailing on the pump side in front of the associated check valve (10). Anordnung nach Anspruch 1, dadurch gekennzeichnet, daß parallel zu dem bei Überschreitung eines vorzugsweise einstellbaren, kolbenseitigen Druckniveaus in Richtung zum stangenseitigen Arbeitsraum (9) öffnenden Vorspannventil (15) ein Rückschlagventil (19) angeordnet ist, welches bei entsprechender Druckbeaufschlagung in Richtung zum kolbenseitigen Arbeitsraum (8) öffnet.Arrangement according to claim 1, characterized in that a non-return valve (19) is arranged parallel to the preload valve (15) which opens in the direction of the rod-side working chamber (9) when a preferably adjustable piston-side pressure level is exceeded, which check valve (19) in the direction of the piston-side working chamber when the pressure is applied accordingly (8) opens. Anordnung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß zwischen Vorspannventil (15) und kolbenseitigem Arbeitsraum (8) eine Parallelanordnung von Drosselstelle (20) und in Richtung kolbenseitigem Arbeitsraum (8) öffnendem Rückschlagventil (21) eingeschaltet ist.Arrangement according to claim 1 or 2, characterized in that a parallel arrangement of the throttle point (20) and the check valve (21) opening in the direction of the piston-side working chamber (8) opens between the preload valve (15) and the piston-side working chamber (8). Anordnung nach einem oder mehreren der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß in die Verbindung der beiden Arbeitsräume (8,9), vorzugsweise zwischen den beiden Parallelanordnungen von Vorspannventil (15) und Rückschlag (19) einerseits und Drosselstelle (20) und Rückschlag (21) andererseits, ein bedarfsweise schaltbares Sitzventil (22) eingeschaltet ist.Arrangement according to one or more of claims 1 to 3, characterized in that in the connection of the two working spaces (8, 9), Preferably between the two parallel arrangements of the bias valve (15) and the check valve (19) on the one hand and the throttle point (20) and the check valve (21) on the other hand, a switchable seat valve (22) is switched on. Anordnung nach einem oder mehreren der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß auf der Absteuerseite des Notventils (17) eine vorzugsweise einstellbare Drosselstelle (23) eingeschaltet ist.Arrangement according to one or more of claims 1 to 4, characterized in that a preferably adjustable throttle point (23) is switched on on the control side of the emergency valve (17). Anordnung nach einem oder mehreren der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß in der Verbindung zwischen stangenseitigem Arbeitsraum (9) und zugehörigem entsperrbaren Rückschlagventil (11) eine vorzugsweise einstellbare Drosselstelle (24) angeordnet ist.Arrangement according to one or more of claims 1 to 5, characterized in that a preferably adjustable throttle point (24) is arranged in the connection between the rod-side working space (9) and the associated unlockable check valve (11).
EP97890053A 1996-04-24 1997-03-20 Hydraulic operating device Expired - Lifetime EP0803630B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT74796 1996-04-24
AT0074796A AT403785B (en) 1996-04-24 1996-04-24 HYDRAULIC ACTUATING ARRANGEMENT
AT747/96 1996-04-24

Publications (3)

Publication Number Publication Date
EP0803630A2 true EP0803630A2 (en) 1997-10-29
EP0803630A3 EP0803630A3 (en) 1998-12-09
EP0803630B1 EP0803630B1 (en) 2002-07-10

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP97890053A Expired - Lifetime EP0803630B1 (en) 1996-04-24 1997-03-20 Hydraulic operating device

Country Status (5)

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US (1) US5760695A (en)
EP (1) EP0803630B1 (en)
JP (1) JPH1082401A (en)
AT (1) AT403785B (en)
DE (1) DE59707673D1 (en)

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EP0959215A2 (en) * 1998-05-22 1999-11-24 Hoerbiger Hydraulik GmbH Assembly for hydraulically operating a tailgate
NL1011362C2 (en) 1999-02-22 2000-08-25 Applied Power Inc Hydraulically operated cover assembly.
EP1103727A2 (en) * 1999-11-26 2001-05-30 Hoerbiger Hydraulik GmbH Hydraulic operating device
WO2002061288A2 (en) * 2001-01-29 2002-08-08 Hoerbiger Hydraulik Gmbh Hydraulic actuating system and check valve which can be hydraulically blocked
EP1298273A1 (en) 2001-10-01 2003-04-02 Actuant Corporation Hydraulic actuating device for a closure assembly
EP1223345A3 (en) * 2001-01-12 2003-11-19 Hoerbiger Hydraulik GmbH Actuation arrangement for parts of vehicles pivotable about an axis
EP1101692A3 (en) * 1999-11-22 2003-11-26 Hoerbiger Hydraulik GmbH Hydraulic operating device
NL1020960C2 (en) 2002-06-28 2003-12-30 Actuant Corp Hydraulically operated cover, e.g. vehicle door or roof, has actuator applying relatively high closure force to cover in final closure region
WO2008061751A1 (en) * 2006-11-23 2008-05-29 Ixetic Bad Homburg Gmbh Gas spring device
WO2008061748A1 (en) * 2006-11-23 2008-05-29 Ixetic Bad Homburg Gmbh Gas spring device
EP1985867A1 (en) * 2007-04-27 2008-10-29 HAWE Hydraulik GmbH & Co. KG Electrohydraulic adjusting device for a solar panel carrier
CN102303615A (en) * 2011-09-22 2012-01-04 南车株洲电力机车有限公司 Device and method for preventing wrongly opening door of urban rail vehicle

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DE19740029C2 (en) * 1997-09-11 1999-07-15 Stabilus Gmbh Active positioning system
NL1008455C2 (en) * 1998-03-03 1999-09-06 Applied Power Inc Hydraulic control device, in particular for operating a folding roof of a vehicle.
AT405860B (en) * 1998-05-20 1999-12-27 Hoerbiger Gmbh OPERATING ARRANGEMENT FOR MOVABLE PARTS ON VEHICLES
AT405749B (en) * 1998-05-22 1999-11-25 Hoerbiger Gmbh ARRANGEMENT FOR HYDRAULICALLY OPERATING A REAR LID
AT405750B (en) * 1998-05-22 1999-11-25 Hoerbiger Gmbh ARRANGEMENT FOR HYDRAULICALLY OPERATING A REAR LID
AT406357B (en) * 1998-10-15 2000-04-25 Hoerbiger Hydraulik ARRANGEMENT FOR HYDRAULICALLY OPERATING A COVER, A REAR COVER OD. DGL.
AT409521B (en) * 2000-06-06 2002-09-25 Hoerbiger Hydraulik ACTUATING ARRANGEMENT FOR SWIVELING PARTS ON VEHICLES
US6785990B2 (en) * 2000-08-01 2004-09-07 David A. Tomlin Device for and method of displaying messages
NL1016373C2 (en) * 2000-10-10 2002-04-11 Actuant Corp Hydraulic control device for a folding roof of a vehicle.
US6848525B1 (en) * 2001-11-16 2005-02-01 Edward A. Peterson Lift for vehicle hoods and the like
FR2896011B1 (en) * 2006-01-12 2011-12-09 Heuliez HYDRAULIC MANEUVER DEVICE OF A VEHICLE OPENER
DE102017121501B3 (en) 2017-09-15 2018-08-23 Hoerbiger Automotive Komfortsysteme Gmbh motor vehicle
DE102017121499B3 (en) 2017-09-15 2018-08-16 Hoerbiger Automotive Komfortsysteme Gmbh motor vehicle

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DE4334843A1 (en) * 1993-10-13 1995-04-20 Pacoma Hydraulik Gmbh Hydraulic activation device for a door on a motor vehicle

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DE4227001A1 (en) * 1992-08-14 1994-02-17 Rexroth Mannesmann Gmbh Hydraulic drive for cam setting in IC engine - has hydraulic pump driven by reversible DC motor and separated from pump by non return valves cross linked to other feed lines.
DE4334843A1 (en) * 1993-10-13 1995-04-20 Pacoma Hydraulik Gmbh Hydraulic activation device for a door on a motor vehicle

Cited By (20)

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Publication number Priority date Publication date Assignee Title
EP0959215A3 (en) * 1998-05-22 2004-01-02 Hoerbiger Hydraulik GmbH Assembly for hydraulically operating a tailgate
EP0959215A2 (en) * 1998-05-22 1999-11-24 Hoerbiger Hydraulik GmbH Assembly for hydraulically operating a tailgate
NL1011362C2 (en) 1999-02-22 2000-08-25 Applied Power Inc Hydraulically operated cover assembly.
EP1031697A1 (en) * 1999-02-22 2000-08-30 Applied Power Inc. Hydraulically actuated cover unit
EP1101692A3 (en) * 1999-11-22 2003-11-26 Hoerbiger Hydraulik GmbH Hydraulic operating device
EP1103727A2 (en) * 1999-11-26 2001-05-30 Hoerbiger Hydraulik GmbH Hydraulic operating device
EP1103727A3 (en) * 1999-11-26 2007-05-09 Hoerbiger Automatisierungstechnik Holding GmbH Hydraulic operating device
EP1223345A3 (en) * 2001-01-12 2003-11-19 Hoerbiger Hydraulik GmbH Actuation arrangement for parts of vehicles pivotable about an axis
WO2002061288A2 (en) * 2001-01-29 2002-08-08 Hoerbiger Hydraulik Gmbh Hydraulic actuating system and check valve which can be hydraulically blocked
WO2002061288A3 (en) * 2001-01-29 2004-02-12 Hoerbiger Hydraulik Hydraulic actuating system and check valve which can be hydraulically blocked
EP1298273A1 (en) 2001-10-01 2003-04-02 Actuant Corporation Hydraulic actuating device for a closure assembly
US6751953B2 (en) 2001-10-01 2004-06-22 Actuant Corporation Hydraulic actuating device for a closure assembly
NL1019067C2 (en) 2001-10-01 2003-04-02 Actuant Corp Hydraulic operating device for a closing assembly.
NL1020960C2 (en) 2002-06-28 2003-12-30 Actuant Corp Hydraulically operated cover, e.g. vehicle door or roof, has actuator applying relatively high closure force to cover in final closure region
WO2008061751A1 (en) * 2006-11-23 2008-05-29 Ixetic Bad Homburg Gmbh Gas spring device
WO2008061748A1 (en) * 2006-11-23 2008-05-29 Ixetic Bad Homburg Gmbh Gas spring device
EP1985867A1 (en) * 2007-04-27 2008-10-29 HAWE Hydraulik GmbH & Co. KG Electrohydraulic adjusting device for a solar panel carrier
US7849687B2 (en) 2007-04-27 2010-12-14 Hawe Hydraulik Gmbh & Co. Kg Electrohydraulic solar panel carrier adjusting device
CN102303615A (en) * 2011-09-22 2012-01-04 南车株洲电力机车有限公司 Device and method for preventing wrongly opening door of urban rail vehicle
CN102303615B (en) * 2011-09-22 2014-02-19 南车株洲电力机车有限公司 Device and method for preventing wrongly opening door of urban rail vehicle

Also Published As

Publication number Publication date
AT403785B (en) 1998-05-25
DE59707673D1 (en) 2002-08-14
EP0803630B1 (en) 2002-07-10
JPH1082401A (en) 1998-03-31
ATA74796A (en) 1997-10-15
US5760695A (en) 1998-06-02
EP0803630A3 (en) 1998-12-09

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