EP0702158A2 - Device for a hydraulic circuit - Google Patents

Device for a hydraulic circuit Download PDF

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Publication number
EP0702158A2
EP0702158A2 EP95113856A EP95113856A EP0702158A2 EP 0702158 A2 EP0702158 A2 EP 0702158A2 EP 95113856 A EP95113856 A EP 95113856A EP 95113856 A EP95113856 A EP 95113856A EP 0702158 A2 EP0702158 A2 EP 0702158A2
Authority
EP
European Patent Office
Prior art keywords
hydraulic circuit
spring
housing
gas
sabot
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.)
Withdrawn
Application number
EP95113856A
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German (de)
French (fr)
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EP0702158A3 (en
Inventor
Peter Dipl.-Ing. Dr. Lell
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Airbus Defence and Space GmbH
Original Assignee
Daimler Benz Aerospace AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Daimler Benz Aerospace AG filed Critical Daimler Benz Aerospace AG
Publication of EP0702158A2 publication Critical patent/EP0702158A2/en
Publication of EP0702158A3 publication Critical patent/EP0702158A3/en
Withdrawn legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/19—Pyrotechnical actuators

Definitions

  • the invention relates to a device that pressurizes a hydraulic circuit.
  • a pyrotechnic gas generator in which a high-pressure housing accommodating a compressed gas-generating capsule is surrounded by a medium-pressure housing.
  • the area of the outlet openings from the medium pressure housing is considerably larger than the surface area of the outlet opening from the high pressure housing into the medium pressure housing.
  • This gas generator is e.g. suitable for a pyrotechnic force element in which the gas emerging from the openings of the medium-pressure housing meets a piston which produces a pushing effect.
  • the invention has for its object to design a device of the type mentioned so that the hydraulic circuit is quickly and safely pressurized if necessary.
  • the main advantage of the invention is that the gas of the gas generator can be safely generated by the pyrotechnic device even after decades of storage without maintenance of the assembly. It is created in a fraction of a second and can therefore pressurize the hydraulic circuit via the sabot, the spring and the pressure stamp.
  • the spring guarantees that the pressure on the pressure stamp can be maintained for a short time.
  • the one-time pressure exerted by the device according to the invention is sufficient; in other systems in which the hydraulic circuit must be under pressure for a long time, the device bridges the time until an emergency unit has started and is fully operational.
  • the pyrotechnic gas generator of the device consists of a propellant charge located in a combustion chamber, which is ignited by means of ignition electronics with or without an igniter.
  • the ignition electronics are powered by a mains current or a battery.
  • the spring which maintains the gas pressure for a long time can be a spiral spring, plate spring or gas spring. All parts of the device are housed in a housing which is interchangeably inserted into a wall of the hydraulic circuit. Depending on the task, a screw, bayonet or sliding lock can be used. The interchangeability guarantees a quick restoration of functionality after using the device. Experience has shown that gas generators are reliable for many years and do not require any maintenance.
  • the single figure shows a schematic representation of a device 1 which is inserted into a wall 2 of a hydraulic tank.
  • a combustion chamber 4 with a propellant charge 4a, a sabot 5, a coil spring 6 and a pressure stamp 7 are accommodated in a housing 3.
  • the housing 3 is screwed with a thread 8 into a receiving bore 10 of the wall 2 provided with a thickening 9 and sealed by a collar 11 in which an O-ring 12 is inserted.
  • An ignition electronics 13 is attached to the housing 3.
  • the function of the device is as follows. After switching on the ignition electronics 13 with the aid of a mains current or a battery present in the ignition electronics 13, the propellant charge 4a is ignited. The resulting gas presses on the sabot 5, the pressure is transferred to the coil spring 6 and on the pressure stamp 7, which exerts the desired pressure on the hydraulic oil 2a located in a space 14 above the pressure stamp 7 and in the hydraulic tank 2. The maximum stroke of the sabot 5 is limited by a lock 15 and that of the plunger 7 by a collar 16. The spring 6 maintains the pressure on the hydraulic oil. If the combustion chamber 4 with the propellant charge 4a is enclosed in a manner not shown by a metallic bellows, the developed propellant gases are hermetically sealed, so that no propellant gas molecules can escape to the outside.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Emergency Lowering Means (AREA)
  • Automotive Seat Belt Assembly (AREA)
  • Air Bags (AREA)

Abstract

In einer Vorrichtung (1) setzt das Gas eines pyrotechnischen Gaserzeugers über einen Treibspiegel (5) eine Feder (6) und einen Druckstempel (7) einen Hydraulikkreis unter Druck. Der pyrotechnische Gaserzeuger besteht aus einer in einer Brennkammer (4) befindlichen Treibladung (4a), die durch eine Anzündelektronik (13) angezündet wird. Alle Teile der Vorrichtung (1) sind in einem Gehäuse (3) enthalten, welches in eine den Hydraulikkreis umschließende Wandung (2) austauschbar eingesetzt ist. <IMAGE>In a device (1), the gas of a pyrotechnic gas generator uses a sabot (5) to pressurize a spring (6) and a pressure ram (7) in a hydraulic circuit. The pyrotechnic gas generator consists of a propellant charge (4a) located in a combustion chamber (4), which is ignited by means of ignition electronics (13). All parts of the device (1) are contained in a housing (3) which is interchangeably inserted in a wall (2) surrounding the hydraulic circuit. <IMAGE>

Description

Die Erfindung betrifft eine Vorrichtung, die einen Hydraulikkreis unter Druck setzt.The invention relates to a device that pressurizes a hydraulic circuit.

Viele Anlagen im Bergungs- und Rettungswesen, Abschaltanlagen für Hochspannungskreise, Öffnungsanlagen für Nottüren usw. werden hydraulisch betrieben. Dabei kommt es darauf an, dafür verwendete hydraulische Kreise schnell unter Druck zu setzen, um die jeweilige Betätigung sicher ausführen zu können. Der für die hydraulischen Kreise erforderliche Druck wird dabei von Aggregaten geliefert, die, besonders wenn sie lange Zeit nicht in Betrieb waren, nicht schnell oder oft auch gar nicht anlaufen. Dadurch ist der Einsatz der jeweiligen Anlage nicht oder oft nicht schnell genug möglich.Many systems in the rescue and rescue service, shutdown systems for high-voltage circuits, opening systems for emergency doors, etc. are operated hydraulically. It is important to pressurize the hydraulic circuits used for this quickly so that the respective operation can be carried out safely. The pressure required for the hydraulic circuits is supplied by units which, especially if they have not been in operation for a long time, do not start quickly or often do not start at all. As a result, the use of the respective system is not possible or often not quickly enough.

Als nächstliegender Stand der Technik ist durch die DE 39 370 032 A1 ein pyrotechnischer Gasgenerator bekannt, bei dem ein eine druckgaserzeugende Kapsel aufnehmendes Hochdruckgehäuse mit einem Mitteldruckgehäuse umgeben ist. Dabei ist die Fläche der Austrittsöffnungen aus dem Mitteldruckgehäuse beträchtlich größer als die Fläche der Austrittsöffnung aus dem Hochdruckgehäuse in das Mitteldruckgehäuse. Dieser Gasgenerator ist z.B. geeignet für ein pyrotechnisches Kraftelement, bei dem das aus den Öffnungen des Mitteldruckgehäuses austretende Gas auf einen eine schiebende Wirkung erzeugenden Kolben trifft.The closest prior art is known from DE 39 370 032 A1, a pyrotechnic gas generator, in which a high-pressure housing accommodating a compressed gas-generating capsule is surrounded by a medium-pressure housing. The area of the outlet openings from the medium pressure housing is considerably larger than the surface area of the outlet opening from the high pressure housing into the medium pressure housing. This gas generator is e.g. suitable for a pyrotechnic force element in which the gas emerging from the openings of the medium-pressure housing meets a piston which produces a pushing effect.

Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung der eingangs genannten Art so auszubilden, daß der Hydraulikkreis im Bedarfsfall schnell und sicher unter Druck gesetzt wird.The invention has for its object to design a device of the type mentioned so that the hydraulic circuit is quickly and safely pressurized if necessary.

Diese Aufgabe wird durch die in Anspruch 1 gekennzeichneten Merkmale gelöst. Vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen gekennzeichnet.This object is achieved by the features characterized in claim 1. Advantageous embodiments of the invention are characterized in the subclaims.

Der wesentliche Vorteil der Erfindung besteht darin, daß das Gas des Gaserzeugers selbst nach jahrzehntelanger Lagerung ohne Wartung der Baugruppe sicher durch die pyrotechnische Vorrichtung erzeugt werden kann. Es entsteht in Bruchteilen einer Sekunde und kann damit über den Treibspiegel, die Feder und den Druckstempel den Hydraulikkreis unter Druck setzen. Die Feder garantiert, daß der Druck auf den Druckstempel eine kurze Zeit aufrechterhalten werden kann. Bei vielen Anlagen, z.B. bei Nottüren, genügt der einmalige Druck, den die erfindungsgemäße Vorrichtung ausübt, bei anderen Anlagen, bei denen der Hydraulikkreis lange unter Druck stehen muß, überbrückt die Vorrichtung die Zeit bis ein Notaggregat angesprungen und voll einsatzfähig ist.The main advantage of the invention is that the gas of the gas generator can be safely generated by the pyrotechnic device even after decades of storage without maintenance of the assembly. It is created in a fraction of a second and can therefore pressurize the hydraulic circuit via the sabot, the spring and the pressure stamp. The spring guarantees that the pressure on the pressure stamp can be maintained for a short time. In many systems, e.g. with emergency doors, the one-time pressure exerted by the device according to the invention is sufficient; in other systems in which the hydraulic circuit must be under pressure for a long time, the device bridges the time until an emergency unit has started and is fully operational.

Der pyrotechnische Gaserzeuger der Vorrichtung besteht in bekannter Weise aus einer in einer Brennkammer befindlichen Treibladung, die durch eine Anzündelektronik mit oder ohne Anzündstück angezündet wird. Je nach der bestehenden Möglichkeit wird dabei die Anzündelektronik durch einen Netzstrom oder eine Batterie gespeist. Die den Gasdruck längere Zeit aufrechterhaltende Feder kann eine Spiralfeder, Tellerfeder oder Gasfeder sein. Alle Teile der Vorrichtung sind in einem Gehäuse untergebracht, welches in eine Wandung des Hydraulikkreises austauschbar eingesetzt ist. Dabei kann je nach Aufgabe ein Schraub-, Bajonett- oder Schiebeverschluß verwendet werden. Die Austauschbarkeit garantiert eine schnelle Wiederherstellung der Funktionsfähigkeit nach dem Einsatz der Vorrichtung. Erfahrungsgemäß sind Gasgeneratoren viele Jahre funktionssicher und bedürfen keiner Wartung.In a known manner, the pyrotechnic gas generator of the device consists of a propellant charge located in a combustion chamber, which is ignited by means of ignition electronics with or without an igniter. Depending on the existing option, the ignition electronics are powered by a mains current or a battery. The spring which maintains the gas pressure for a long time can be a spiral spring, plate spring or gas spring. All parts of the device are housed in a housing which is interchangeably inserted into a wall of the hydraulic circuit. Depending on the task, a screw, bayonet or sliding lock can be used. The interchangeability guarantees a quick restoration of functionality after using the device. Experience has shown that gas generators are reliable for many years and do not require any maintenance.

Weitere Vorteile und Ausgestaltungen der Vorrichtung sind aus der nachstehenden Beschreibung der Erfindung an Hand der Zeichnung ersichtlich.Further advantages and configurations of the device can be seen from the following description of the invention with reference to the drawing.

Die einzige Figur zeigt in schematischer Darstellung eine Vorrichtung 1, die in eine Wandung 2 eines Hydrauliktanks eingesetzt ist. In einem Gehäuse 3 sind eine Brennkammer 4 mit einer Treibladung 4a, ein Treibspiegel 5, eine Spiralfeder 6 und ein Druckstempel 7 untergebracht. Das Gehäuse 3 ist mit einem Gewinde 8 in eine mit einer Verdickung 9 versehenen Aufnahmebohrung 10 der Wandung 2 eingeschraubt und über einen Bund 11, in dem ein O-Ring 12 eingesetzt ist, abgedichtet. An das Gehäuse 3 ist eine Anzündelektronik 13 angesetzt.The single figure shows a schematic representation of a device 1 which is inserted into a wall 2 of a hydraulic tank. In a housing 3, a combustion chamber 4 with a propellant charge 4a, a sabot 5, a coil spring 6 and a pressure stamp 7 are accommodated. The housing 3 is screwed with a thread 8 into a receiving bore 10 of the wall 2 provided with a thickening 9 and sealed by a collar 11 in which an O-ring 12 is inserted. An ignition electronics 13 is attached to the housing 3.

Die Funktion der Vorrichtung ist folgendermaßen. Nach dem Einschalten der Anzündelektronik 13 mit Hilfe eines Netzstromes oder einer in der Anzündelektronik 13 vorhandenen Batterie wird die Treibladung 4a angezündet. Das entstehende Gas drückt auf den Treibspiegel 5, der Druck überträgt sich auf die Spiralfeder 6 und auf den Druckstempel 7, der auf das in einem Raum 14 oberhalb des Druckstempels 7 und in dem Hydrauliktank 2 befindliche Hydrauliköl 2a den gewünschten Druck ausübt. Der maximale Hub des Treibspiegels 5 wird durch einen Feststeller 15 und derjenige des Druckstempels 7 durch einen Bund 16 begrenzt. Dabei hält die Feder 6 den Druck auf das Hydrauliköl aufrecht. Wenn die Brennkammer 4 mit der Treibladung 4a in nicht dargestellter Weise von einem metallischen Faltenbalg umschlossen ist, sind die entwickelten Treibgase hermetisch abgeschlossen, so daß auch keine Treibgasmoleküle nach außen dringen können.The function of the device is as follows. After switching on the ignition electronics 13 with the aid of a mains current or a battery present in the ignition electronics 13, the propellant charge 4a is ignited. The resulting gas presses on the sabot 5, the pressure is transferred to the coil spring 6 and on the pressure stamp 7, which exerts the desired pressure on the hydraulic oil 2a located in a space 14 above the pressure stamp 7 and in the hydraulic tank 2. The maximum stroke of the sabot 5 is limited by a lock 15 and that of the plunger 7 by a collar 16. The spring 6 maintains the pressure on the hydraulic oil. If the combustion chamber 4 with the propellant charge 4a is enclosed in a manner not shown by a metallic bellows, the developed propellant gases are hermetically sealed, so that no propellant gas molecules can escape to the outside.

Claims (8)

Vorrichtung, die einen Hydraulikkreis unter Druck setzt, dadurch gekennzeichnet, daß das Gas eines pyrotechnischen Gaserzeugers über einen Treibspiegel (5), eine Feder (6) und einen Druckstempel (7) den Hydraulikkreis unter Druck setzt.Device which pressurizes a hydraulic circuit, characterized in that the gas of a pyrotechnic gas generator uses a sabot (5), a spring (6) and a pressure ram (7) to pressurize the hydraulic circuit. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der pyrotechnische Gaserzeuger aus einer in einer Brennkammer (4) befindlichen Treibladung (4a) besteht, die durch eine Anzündelektronik (13) angezündet wird.Apparatus according to claim 1, characterized in that the pyrotechnic gas generator consists of a propellant charge (4a) located in a combustion chamber (4) which is ignited by means of ignition electronics (13). Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Feder (6) eine Spiralfeder, Tellerfeder oder Gasfeder ist.Device according to claim 1, characterized in that the spring (6) is a spiral spring, plate spring or gas spring. Vorrichtung nach den Ansprüchen 1 bis 3, dadurch gekennzeichnet, daß alle Teile der Vorrichtung (1) in einem Gehäuse (3) enthalten sind, welches in eine den Hydraulikkreis umschließende Wandung (2) austauschbar eingesetzt ist.Device according to claims 1 to 3, characterized in that all parts of the device (1) are contained in a housing (3) which is interchangeably inserted in a wall (2) surrounding the hydraulic circuit. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß der Druckstempel (7) direkt auf das Öl (2a) in dem Hydraulikkreis wirkt und in seiner Be- wegung durch einen am Ende des Gehäuses (3) befindlichen Bund (16) begrenzt ist.Device according to claim 4, characterized in that the pressure ram (7) acts directly on the oil (2a) in the hydraulic circuit and its movement is limited by a collar (16) located at the end of the housing (3). Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß der Treibspiegel (5) durch im Gehäuse (3) vorhandene Feststeller (15) in seiner Bewegung begrenzt ist.Device according to claim 4, characterized in that the movement of the sabot (5) is limited by the locking device (15) provided in the housing (3). Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß die Brennkammer (4) von einem metallischen Faltenbalg umschlossen ist, der die entstehenden Treibgase nach außen hermetisch abdichtet.Apparatus according to claim 2, characterized in that the combustion chamber (4) is enclosed by a metallic bellows, which hermetically seals the resulting propellant gases to the outside. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß die normalerweise mit einem pyrotechnischen Anzündstück versehene Anzündelektronik lediglich einen Glühdraht beaufschlagt, der dann die Treibladung (4a) anzündet.Device according to Claim 2, characterized in that the ignition electronics, which are normally provided with a pyrotechnic igniter, merely apply a glow wire which then ignites the propellant charge (4a).
EP95113856A 1994-09-17 1995-09-04 Device for a hydraulic circuit Withdrawn EP0702158A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4433212 1994-09-17
DE4433212A DE4433212C1 (en) 1994-09-17 1994-09-17 Hydraulic circuit pressuriser for rescue or emergency appliances

Publications (2)

Publication Number Publication Date
EP0702158A2 true EP0702158A2 (en) 1996-03-20
EP0702158A3 EP0702158A3 (en) 1996-08-14

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ID=6528509

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Application Number Title Priority Date Filing Date
EP95113856A Withdrawn EP0702158A3 (en) 1994-09-17 1995-09-04 Device for a hydraulic circuit

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US (1) US5582010A (en)
EP (1) EP0702158A3 (en)
CA (1) CA2158398A1 (en)
DE (1) DE4433212C1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7182191B2 (en) * 2002-07-11 2007-02-27 Autoliv Asp, Inc. Motion damper
US6764118B2 (en) 2002-09-11 2004-07-20 Autoliv Asp, Inc. Active bumper assembly
US6942261B2 (en) 2003-08-14 2005-09-13 Autoliv Asp, Inc. Linear actuator with an internal dampening mechanism
DE102005042364A1 (en) * 2005-09-07 2007-03-15 Zf Friedrichshafen Ag Pressure medium system e.g. pneumatic system, safety device for motor vehicle, has gas supply units activated individually or in combination, where gas volume is controlled, and gas expansion of unit is switched in controllable manner

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3937032A1 (en) 1989-11-07 1991-05-08 Dynamit Nobel Ag Pyrotechnical gas generator with linked apertured chambers - ensuring final discharge pressure below peak formation pressure

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Publication number Priority date Publication date Assignee Title
US2509942A (en) * 1944-11-02 1950-05-30 Bendix Westinghouse Automotive Fluid pressure system with automatic means for replenishing pressure
US2674852A (en) * 1947-09-30 1954-04-13 Olman Peter Michael Emergency pressure applicator
US2912902A (en) * 1958-06-20 1959-11-17 Thomas G Nessler Explosive powered bomb release unit
US3031845A (en) * 1959-10-09 1962-05-01 Ling Temco Vought Inc Hydraulic system
US3199288A (en) * 1963-03-20 1965-08-10 Joseph A Nahas Explosively actuated piston driver
US4091621A (en) * 1975-06-02 1978-05-30 Networks Electronic Corp. Pyrotechnic piston actuator
EP0009346B1 (en) * 1978-09-18 1981-11-18 Sperry Limited Fluid supply systems
FR2685741A1 (en) * 1991-12-31 1993-07-02 Thomson Brandt Armements PYROTECHNIC CYLINDER WITH AMORTIZED RUN.
DE4330216C2 (en) * 1993-09-07 1995-08-17 Daimler Benz Aerospace Ag Transportable rescue and emergency equipment

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3937032A1 (en) 1989-11-07 1991-05-08 Dynamit Nobel Ag Pyrotechnical gas generator with linked apertured chambers - ensuring final discharge pressure below peak formation pressure

Also Published As

Publication number Publication date
EP0702158A3 (en) 1996-08-14
CA2158398A1 (en) 1996-03-18
DE4433212C1 (en) 1996-01-25
US5582010A (en) 1996-12-10

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