EP1250533A1 - Hydropneumatic accumulator - Google Patents

Hydropneumatic accumulator

Info

Publication number
EP1250533A1
EP1250533A1 EP01902324A EP01902324A EP1250533A1 EP 1250533 A1 EP1250533 A1 EP 1250533A1 EP 01902324 A EP01902324 A EP 01902324A EP 01902324 A EP01902324 A EP 01902324A EP 1250533 A1 EP1250533 A1 EP 1250533A1
Authority
EP
European Patent Office
Prior art keywords
trough
valve
bellows
hydraulic fluid
space
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
EP01902324A
Other languages
German (de)
French (fr)
Other versions
EP1250533B1 (en
Inventor
Norbert Weber
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.)
Hydac Technology GmbH
Original Assignee
Hydac Technology GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hydac Technology GmbH filed Critical Hydac Technology GmbH
Publication of EP1250533A1 publication Critical patent/EP1250533A1/en
Application granted granted Critical
Publication of EP1250533B1 publication Critical patent/EP1250533B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/04—Accumulators
    • F15B1/08—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor
    • F15B1/22—Liquid port constructions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/04—Accumulators
    • F15B1/08—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor
    • F15B1/10—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating means
    • F15B1/103—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating means the separating means being bellows
    • 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
    • F15B2201/00—Accumulators
    • F15B2201/20—Accumulator cushioning means
    • F15B2201/205—Accumulator cushioning means using gas
    • 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
    • F15B2201/00—Accumulators
    • F15B2201/30—Accumulator separating means
    • F15B2201/315—Accumulator separating means having flexible separating means
    • F15B2201/3153—Accumulator separating means having flexible separating means the flexible separating means being bellows
    • 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
    • F15B2201/00—Accumulators
    • F15B2201/40—Constructional details of accumulators not otherwise provided for
    • F15B2201/41—Liquid ports
    • F15B2201/411—Liquid ports having valve means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/40—Constructional details of accumulators not otherwise provided for
    • F15B2201/415—Gas ports

Definitions

  • the invention relates to a hydropneumatic pressure accumulator with a bellows separating a gas space from an oil space within the storage housing, in particular a metal bellows, which is fastened at one end to the storage housing in such a way that the oil space adjoins the inside of the bellows, which its free other end is closed by a corresponding volume change of gas space and oil space closing body, and with a flow of hydraulic fluid from and into the oil space releasing or blocking valve, which upon movement of the closing body, which exceeds a predetermined maximum magnification of the Corresponds to the volume of the gas space through which the closing body can be moved into its blocking position.
  • the maximum value of the volume of the gas space essentially corresponds to the stroke volume, which is defined by the movement of the end plate when the metal bellows is pulled together and pulled out, the stroke length which the end plate can cover within the accumulator housing must be sufficient - Chosen long enough if a sufficient volume of the gas space is to be made available for the operation of the storage.
  • the invention has for its object to provide a pressure accumulator of the type under consideration, which in contrast is characterized by improved operating properties.
  • this object is achieved according to the invention in that the closing body is designed in the form of a trough, that the trough is connected with its edge located at the open end to the associated free end of the bellows, that the trough is connected to its side wall extends along the inside of the bellows and that the bottom of the trough is designed as a movable valve member of the valve controlling the flow of hydraulic fluid.
  • the design according to the invention in which the bellows surrounds the outside of a trough open on the gas side, is advantageous in several respects. Since the entire interior of the trough is available as part of the gas space, an optimal ratio between the total size of the storage housing and the volume of the gas space is achieved. While in the known pressure accumulator mentioned above, a sufficient volume of the gas space can only be achieved by using the
  • Metal bellows allows a sufficient stroke in the storage housing, which leads to the mentioned overload problems of the bellows, the stroke of the closing body corresponding to the extension of the bellows can be made practically arbitrarily small in the invention.
  • the storage housing can be shaped in such a way that it forms a mechanical stop after a short stroke movement of the trough, because the entire interior of the trough is available as a gas space volume.
  • the bellows is not only protected against excessive pulling out, but because it surrounds the outside of the trough, the bellows is also mechanically on the outside in the event of excess pressure in the gas space of the trough supported over the entire length.
  • This in turn enables the gas pre-filling pressure to be built up before the pressure accumulator is put into operation, ie before the hydraulic system is connected on the oil side. If the latter is the case and the operating pressure is built up in the oil space, the valve controlling the outflow of hydraulic fluid from the oil space maintains pressure equilibrium at the bellows.
  • the trough is preferably circular-cylindrical in shape and the depth of the trough is dimensioned such that its base, which serves as a valve member, interacts as a movable circular valve plate with a valve seat which is formed on the inner wall of the storage housing.
  • This not only results in a particularly simple construction of the valve, but, since the entire surface of the trough bottom is available as a valve plate, a particularly large-area seal can be achieved when the valve is locked.
  • an O-ring can be provided, for example, in the radially outer edge region of the round trough bottom to form an annular sealing surface.
  • a valve tappet fastened to the trough bottom is provided, which is connected to a second movable valve member which, with a movement of the trough exceeding a predetermined minimum value of the volume of the gas space, with a second valve seat blocking the flow of hydraulic fluid into the oil space interacts.
  • the valve lifter also has a guiding function during the lifting movement of the bellows, so that a perfect fit of the trough bottom serving as a valve member on the valve seat and thus a proper locking of the valve are ensured.
  • the invention is explained in detail below with reference to an exemplary embodiment shown in the drawing, in which a metal bellows is used.
  • the single figure shows a longitudinal section of the embodiment of the pressure accumulator.
  • the illustrated embodiment of the pressure accumulator is intended in particular for use in electrohydraulic brake systems and has a accumulator housing designated as a whole as 1.
  • This has an essentially circular-cylindrical main part 3, which is closed on the one hand by a welded-on base cover 5 and on the other hand by a welded-on, flat-curved end cap 7.
  • a central hydraulic connection 9 with passages 11 for the inflow and outflow of a hydraulic fluid to the oil space 13 within the storage housing 1 is provided in the floor cover 5.
  • a centrally located gas filling opening is provided on the end cap 7, which is closed by a stopper 15 and enables a desired gas pre-filling pressure to be produced by filling with a compressible gas in the adjoining gas space 17 of the storage housing 1, for example by filling it with Nitrogen.
  • the outer diameter of the metal bellows 19 is slightly smaller than the inner diameter of the cylindrical main part 3 of the storage housing 1.
  • the metal bellows 19 is sealed by a closing body in the form of a trough 21. In the exemplary embodiment shown, this is circular-cylindrical in shape and has an outer diameter which is somewhat smaller than the inner diameter of the metal bellows 19.
  • the trough 21 is fastened at its open end 23 to the associated free end of the metal bellows 19 with a flange-like edge 25 which is folded outwards , so that the side wall 27 of the trough 21 extends along the inside of the metal bellows 19 surrounding the trough and the interior of the metal bellows 19 merely with the narrow annular space 29 between the outside of the side wall
  • the gas space 17, on the other hand, has a much larger volume because not only the annular space within the storage housing 1 as the gas space
  • the hydraulic connection 9 is assigned a double-acting oil valve 31, which has two valve units which block or release the flow of hydraulic fluid through the passages 11 in opposite flow directions, which are controllable by movements of the metal bellows 19 and thus of the trough 21 if the metal bellows 19 contracts or expands due to pressure differences in the oil space 1 3 and the gas space 17 and the trough 21 executes a corresponding movement along the central longitudinal axis 33 of the storage housing 1.
  • the depth of the trough 21 is dimensioned such that when the metal bellows 19 is unloaded, for example when both the oil chamber 3 and the gas chamber 17 are depressurized, the trough bottom 35 extends into the vicinity of the inner wall 37 of the bottom cover 5.
  • the trough bottom 35 is designed as a circular valve plate, which, with the adjacent inner wall 37, which is designed as an associated valve seat, forms one of the valve units mentioned.
  • an O-ring 39 is provided on the radially outer edge of the trough bottom 35 and an O-ring 41 on the inner wall 37 of the bottom cover 5, the O-rings 39 and 41 being received in corresponding ring grooves. Due to the relatively large radial distance of the sealing surfaces from the central longitudinal axis 33 due to the diameter of the trough 21, a large-area sealing and thus a very secure locking of the valve is ensured.
  • the second valve unit has a valve body 43 which can be moved together with the trough 21 via a valve tappet 45 fastened to the trough bottom 35.
  • the valve lifter 45 extends out of the storage housing 1 through a central bore 47 in the base cover 5.
  • the valve body 43 interacts with a valve seat 49 formed in the hydraulic connection 9 and has an O-ring 50 which can be placed on the valve seat.
  • the trough 21 moves when the metal bellows 19 contracts due to an overpressure state in the gas chamber 17 relative to the oil chamber 13 with its trough bottom 35 serving as a valve plate on the inner wall 37 of the bottom cover 5, so that the O-rings 39 and 41 come to rest on corresponding surfaces of the valve seat or valve plate and an outflow of hydraulic fluid through the passages 11 from the oil space 13 is blocked.
  • the pressure accumulator according to the invention by the presence of the double-acting valve 31, that is to say in that both the outflow of hydraulic fluid and the inflow of hydraulic fluid are controlled, operates in a self-controlling manner in operation with regard to maintaining the pressure equalization on the metal bellows 19, as a result of which maximum operational reliability is guaranteed over long periods of operation and metal bellows of light construction can be used advantageously accordingly. It also results from the fact that a trough 21 extending into the interior of the metal bellows 19 is provided as the end of the open end of the metal bellows 19, not only the advantage of the simplified one

Abstract

A hydropneumatic accumulator includes a bellows inside the accumulator housing, separating a gas chamber from an oil chamber. The bellows is fastened at one end to the accumulator housing so that the oil chamber is delimited by the inside of the bellows, and is sealed on the other free end by a closing body that is movable according to changes in volume of the gas chamber and of the oil chamber. The hydropneumatic accumulator also includes a valve to enable a hydraulic fluid to flow out of and into the oil chamber or to block the flow of the hydraulic fluid. The valve can be moved into its blocking position by the closing body when the closing body undergoes a movement corresponding to an increase in the volume of the gas chamber that exceeds a predetermined maximum value. The closing body is in the shape of a trough, with its edge located on the open end connected to the free end of the bellows. The trough extends with its lateral wall along the inside of the bellows. The bottom of the trough is configured as a moveable valve element of the valve that controls the flow of hydraulic fluid.

Description

Hydropneumatischer Druckspeicher Hydropneumatic pressure accumulator
Die Erfindung bezieht sich auf einen hydropneumatischen Druckspeicher mit einem innerhalb des Speichergehäuses einen Gasraum von einem Olraum trennenden Balg, insbesondere einem Metallbalg, der an seinem einen Ende am Speichergehäuse so befestigt ist, daß der Olraum an die In- nenseite des Balges angrenzt, der an seinem freien anderen Ende durch einen entsprechend Volumenänderungen von Gasraum und Olraum beweglichen Abschlußkörper verschlossen ist, und mit einem das Strömen von Hydraulikfluidum aus dem und in den Olraum freigebenden oder sperrenden Ventil, das bei einer Bewegung des Abschlußkörpers, die einer einen vorgegebenen Größtwert übersteigenden Vergrößerung des Volumens des Gasraumes entspricht, durch den Abschlußkörper in seine sperrende Stellung überführbar ist.The invention relates to a hydropneumatic pressure accumulator with a bellows separating a gas space from an oil space within the storage housing, in particular a metal bellows, which is fastened at one end to the storage housing in such a way that the oil space adjoins the inside of the bellows, which its free other end is closed by a corresponding volume change of gas space and oil space closing body, and with a flow of hydraulic fluid from and into the oil space releasing or blocking valve, which upon movement of the closing body, which exceeds a predetermined maximum magnification of the Corresponds to the volume of the gas space through which the closing body can be moved into its blocking position.
Bekanntermaßen muß bei Balgspeichern mit Gummibälgen oder Metallbäl- gen darauf geachtet werden, daß Überbelastungen des Balges vermieden werden. Bei einem bekannten Druckspeicher der obengenannten Art, der einen Metallbalg benutzt, vergleiche WO 97/46823, ist im Hinblick auf dieses Problem ein Ventilstößel des am Olraum angeschlossenen Ventiles relativ zum Abschlußkörper des Metallbalges in solcher Lagebeziehung an- geordnet, daß der als ebene Endplatte ausgebildete Abschlußkörper des Metallbalges den Ventilstößel bei Erreichen einer gewünschten Endstellung beaufschlagt und in die Sperrstellung des Ventils verschiebt, so daß der Ausstrom von Hydraulikfluidum aus dem Olraum bei Erreichen dieser Endstellung der Endplatte des Metallbalges unterbunden wird. Bei geschlosse- nem Ventil bleibt somit, selbst wenn das angeschlossene Hydrauliksystem drucklos werden sollte, im Olraum des Speichers ein Druck aufrechterhalten, der dem im Gasraum momentan herrschenden Gasdruck entspricht, so daß am Metallbalg beidseits Druckgleichgewicht herrscht.As is known, in bellows accumulators with rubber bellows or metal bellows, care must be taken to avoid overloading the bellows. In a known pressure accumulator of the type mentioned above, which uses a metal bellows, compare WO 97/46823, with regard to this problem, a valve tappet of the valve connected to the oil space is arranged in such a positional relationship relative to the closing body of the metal bellows that the valve is designed as a flat end plate Final body of the Metal bellows acts upon the valve tappet when a desired end position is reached and moves it into the blocking position of the valve, so that the outflow of hydraulic fluid from the oil space is prevented when the end plate of the metal bellows is reached when this end position is reached. When the valve is closed, even if the connected hydraulic system should become depressurized, a pressure is maintained in the oil space of the accumulator which corresponds to the gas pressure currently prevailing in the gas space, so that there is pressure equilibrium on both sides of the metal bellows.
Zwar ist dadurch eine Überbelastung des Balges dann verhindert, wenn im Betrieb des Druckspeichers der Druck des ölseitig angeschlossenen Hydrau- liksystemes abfällt, es besteht jedoch weiterhin die Gefahr der Beschädigung des Balges bei Zuständen mit auf der Ölseite herrschendem Überdruck oder bei einem Fehlen des Vorfülldruckes auf der Gasseite. Da bei dem bekannten Druckspeicher der erwähnten Art der Größtwert des Volumens des Gasraumes im wesentlichen dem Hubvolumen entspricht, welches durch die bei Zusammenziehen und Ausziehen des Metallbalges erfolgende Bewegung der Endplatte definiert ist, muß die Hublänge, welche die Endplatte innerhalb des Speichergehäuses zurücklegen kann, ausrei- chend lang gewählt werden, wenn ein für den Betrieb des Speichers ausreichendes Volumen des Gasraumes zur Verfügung gestellt werden soll. Bei fehlendem Gas-Vorfülldruck oder ölseitig herrschendem Überdruck wirkt daher der herrschende Druckgradient auf den voll ausgezogenen und damit mechanisch am stärksten belasteten Metallbalg. Man ist daher gezwungen, entweder dickere oder aber mehrlagige Metallbälge zur Anwendung zu bringen. In nachteiliger Weise wird dadurch die Federsteifigkeit stark vergrößert, was zu einem verhältnismäßig schlechten Ansprechverhalten im Betrieb führt. Mehrlagige Bälge führen zu erhöhtem Gewicht und höheren Kosten. Außerdem ergibt sich ein geringerer Hub pro Balgwindung. Der Erfindung liegt die Aufgabe zugrunde, einen Druckspeicher der betrachteten Art zu schaffen, der sich demgegenüber durch verbesserte Betriebseigenschaften auszeichnet.This prevents the bellows from being overloaded if the pressure of the hydraulic system connected on the oil side drops during operation of the pressure accumulator, but there is still the risk of damage to the bellows in the case of conditions with overpressure on the oil side or in the absence of the pre-filling pressure the gas side. Since in the known pressure accumulator of the type mentioned, the maximum value of the volume of the gas space essentially corresponds to the stroke volume, which is defined by the movement of the end plate when the metal bellows is pulled together and pulled out, the stroke length which the end plate can cover within the accumulator housing must be sufficient - Chosen long enough if a sufficient volume of the gas space is to be made available for the operation of the storage. In the absence of a gas pre-charge pressure or overpressure on the oil side, the prevailing pressure gradient acts on the fully extended and thus mechanically most stressed metal bellows. One is therefore forced to use either thicker or multi-layer metal bellows. The disadvantage is that the spring stiffness is greatly increased, which leads to a relatively poor response in operation. Multi-layer bellows lead to increased weight and higher costs. There is also a lower stroke per bellows turn. The invention has for its object to provide a pressure accumulator of the type under consideration, which in contrast is characterized by improved operating properties.
Bei einem hydropneumatischen Druckspeicher der eingangs genannten Art ist diese Aufgabe erfindungsgemäß dadurch gelöst, daß der Abschlußkörper in Form eines Troges ausgebildet ist, daß der Trog mit seinem am offenen Ende befindlichen Rand mit dem zugeordneten freien Ende des Balges verbunden ist, daß der Trog sich mit seiner Seitenwand längs der Innenseite des Balges erstreckt und daß der Boden des Troges als bewegliches Ventilglied des das Strömen von Hydraulikfluidum steuernden Ventiles ausgebildet ist.In a hydropneumatic pressure accumulator of the type mentioned, this object is achieved according to the invention in that the closing body is designed in the form of a trough, that the trough is connected with its edge located at the open end to the associated free end of the bellows, that the trough is connected to its side wall extends along the inside of the bellows and that the bottom of the trough is designed as a movable valve member of the valve controlling the flow of hydraulic fluid.
Die erfindungsgemäße Bauweise, bei der der Balg die Außenseite eines gasseitig offenen Troges umgibt, ist in mehrfacher Hinsicht vorteilhaft. Da der gesamte Innenraum des Troges als Teil des Gasraumes zur Verfügung steht, erreicht man ein optimales Verhältnis zwischen Gesamtgröße des Speichergehäuses und Volumen des Gasraumes. Während bei dem oben erwähnten, bekannten Druckspeicher ein ausreichendes Volumen des Gas- raumes nur dadurch zu verwirklichen ist, daß man für die Endplatte desThe design according to the invention, in which the bellows surrounds the outside of a trough open on the gas side, is advantageous in several respects. Since the entire interior of the trough is available as part of the gas space, an optimal ratio between the total size of the storage housing and the volume of the gas space is achieved. While in the known pressure accumulator mentioned above, a sufficient volume of the gas space can only be achieved by using the
Metallbalges einen ausreichenden Hubweg im Speichergehäuse zuläßt, was zu den erwähnten Überlastungsproblemen des Balges führt, kann bei der Erfindung der dem Ausziehen des Balges entsprechende Hubweg des Abschlußkörpers praktisch beliebig klein ausgeführt werden. Mit anderen Wor- ten gesagt, kann das Speichergehäuse so geformt werden, daß es nach kurzer Hubbewegung des Troges einen mechanischen Anschlag bildet, weil der gesamte Innenraum des Troges als Gasraumvolumen zur Verfügung steht.Metal bellows allows a sufficient stroke in the storage housing, which leads to the mentioned overload problems of the bellows, the stroke of the closing body corresponding to the extension of the bellows can be made practically arbitrarily small in the invention. In other words, the storage housing can be shaped in such a way that it forms a mechanical stop after a short stroke movement of the trough, because the entire interior of the trough is available as a gas space volume.
Der Balg ist auf diese Weise nicht nur gegen zu starkes Ausziehen geschützt, sondern, da er die Außenseite des Troges umringt, ist der Balg bei im Gasraum herrschendem Überdruck auch mechanisch auf der Außenseite des Troges auf gesamter Länge abgestützt. Dies ermöglicht wiederum den Aufbau des Gas-Vorfülldruckes bereits vor Inbetriebnahme des Druckspeichers, d.h. bevor das Hy rauli system ölseitig angeschlossen ist. Wenn letzteres der Fall ist und im Olraum der Betriebsdruck einmal aufgebaut ist, wird durch das den Abfluß von Hydraulikfluidum aus dem Olraum steuernde Ventil Druckgleichgewicht am Balg aufrecht erhalten. Dadurch, daß der Trog außenseitig vom Balg umgeben ist, ergibt sich ein sehr geringes „Tot~ voiumen" zwischen Trog und Balg, so daß in vorteilhafter Weise vor dem Befüllen des Gasraumes nur eine geringe Menge an Hydraulikfluidum ein- gefüllt werden muß, was wiederum eine Gewichts- und Kostenersparnis bedeutet.In this way, the bellows is not only protected against excessive pulling out, but because it surrounds the outside of the trough, the bellows is also mechanically on the outside in the event of excess pressure in the gas space of the trough supported over the entire length. This in turn enables the gas pre-filling pressure to be built up before the pressure accumulator is put into operation, ie before the hydraulic system is connected on the oil side. If the latter is the case and the operating pressure is built up in the oil space, the valve controlling the outflow of hydraulic fluid from the oil space maintains pressure equilibrium at the bellows. Because the trough is surrounded on the outside by the bellows, there is very little "dead volume" between the trough and bellows, so that advantageously only a small amount of hydraulic fluid has to be filled in before filling the gas space, which in turn means weight and cost savings.
Da der Boden des Troges gleichzeitig als bewegliches Ventilglied ausgebildet ist, ergibt sich zudem eine besonders kompakte und einfache Bauweise.Since the bottom of the trough is also designed as a movable valve member, this also results in a particularly compact and simple construction.
Vorzugsweise ist der Trog kreiszylindrisch geformt, und die Tiefe des Troges ist so bemessen, daß sein als Ventilglied dienender Boden als beweglicher kreisrunder Ventilteller mit einem Ventilsitz zusammenwirkt, der an der Innenwand des Speichergehäuses ausgebildet ist. Dadurch ergibt sich nicht nur eine besonders einfache Bauweise des Ventils, sondern, da die gesamte Fläche des Trogbodens als Ventilteller zur Verfügung steht, läßt sich eine besonders großflächige Abdichtung beim Sperrzustand des Venti- les erreichen. Hierzu kann beispielsweise im radial außenliegenden Randbereich des runden Trogbodens ein O-Ring zur Bildung einer ringförmigen Dichtfläche vorgesehen sein.The trough is preferably circular-cylindrical in shape and the depth of the trough is dimensioned such that its base, which serves as a valve member, interacts as a movable circular valve plate with a valve seat which is formed on the inner wall of the storage housing. This not only results in a particularly simple construction of the valve, but, since the entire surface of the trough bottom is available as a valve plate, a particularly large-area seal can be achieved when the valve is locked. For this purpose, an O-ring can be provided, for example, in the radially outer edge region of the round trough bottom to form an annular sealing surface.
Bei einem besonders vorteilhaften Ausführungsbeispiel ist ein am Trogboden befestigter Ventilstößel vorgesehen, der mit einem zweiten beweglichen Ventilglied verbunden ist, das bei einer einen vorgegebenen Kleinst- wert des Volumens des Gasraumes übersteigenden Bewegung des Troges mit einem das Strömen von Hydraulikfluidum in den Olraum sperrenden zweiten Ventilsitz zusammenwirkt. Dadurch eröffnet sich die vorteilhafte Möglichkeit, auch die dem Kleinstwert des Volumens des Gasraumes entsprechende Endstellung des Troges mit Hilfe eines ölseitigen Ventiles zu steuern. Wenn bei einer durch Überdruck auf der Ölseite bewirkten Bewegung des Troges durch den mit diesem verbundenen Ventilstößel der Zu- ström von Hydraulikfluidum zum Olraum gesperrt wird, wird Druckausgleich am Balg hergestellt. Wenn beim Betrieb des erfindungsgemäßen Druckspeichers einmal das Druckgleichgewicht zwischen Gas-Vorfülldruck im Gasraum und Hydraulikdruck im Olraum hergestellt ist und sich der den Abschluß des Balges bildende Trog zwischen seinen vorgegebenen Endstel- lungen befindet, bei dem beide Ventilglieder von ihren zugehörigen Ventilsitzen abgehoben sind, der Fluidstrom also nicht gesperrt ist, dann bleibt der Zustand des Druckausgleiches am Balg im Betrieb erhalten, ungeachtet dessen, ob der Hydraulikdruck der Ölseite gegenüber dem Gas- Vorfülldruck absinken mag (was zum Sperren des Ventiles führt) oder unge- achtet dessen, wie stark der Hydraulikdruck relativ zum Gas-Vorfülldruck ansteigen mag (was wiederum zum Sperren des Ventiles führt, so daß kein weiterer Zustrom zum Olraum mehr möglich ist).In a particularly advantageous exemplary embodiment, a valve tappet fastened to the trough bottom is provided, which is connected to a second movable valve member which, with a movement of the trough exceeding a predetermined minimum value of the volume of the gas space, with a second valve seat blocking the flow of hydraulic fluid into the oil space interacts. This opens up the advantageous one Possibility to control the end position of the trough corresponding to the minimum value of the volume of the gas space with the help of an oil-side valve. If the inflow of hydraulic fluid to the oil space is blocked during a movement of the trough caused by overpressure on the oil side by the valve tappet connected to it, pressure compensation on the bellows is established. Once the pressure equilibrium between the gas pre-filling pressure in the gas space and the hydraulic pressure in the oil space is established during operation of the pressure accumulator according to the invention and the trough forming the end of the bellows is between its predetermined end positions, in which both valve elements are lifted from their associated valve seats, the If the fluid flow is not blocked, the state of pressure equalization at the bellows remains in operation, regardless of whether the hydraulic pressure on the oil side may drop compared to the gas pre-charge pressure (which leads to the valve being blocked) or regardless of how strong it is Hydraulic pressure may increase relative to the gas pre-filling pressure (which in turn leads to the valve being blocked so that no further inflow to the oil space is possible).
Der Ventilstößel hat auch eine Führungsfunktion bei der Hubbewegung des Balges, so daß ein einwandfreier Sitz des als Ventilglied dienenden Trogbodens am Ventilsitz und damit ein einwandfreies Sperren des Ventiles gewährleistet sind.The valve lifter also has a guiding function during the lifting movement of the bellows, so that a perfect fit of the trough bottom serving as a valve member on the valve seat and thus a proper locking of the valve are ensured.
Da der Balg im Gleichgewichtszustand arbeitet, kann eine leichte Bauweise des Balges angewendet werden, was nicht nur zur Gewichtsverringerung, sondern auch zu einem besonders guten Ansprechverhalten führt.Since the bellows works in a state of equilibrium, a lightweight construction of the bellows can be used, which not only leads to a reduction in weight, but also to a particularly good response behavior.
Nachstehend ist die Erfindung anhand eines in der Zeichnung dargestellten Ausführungsbeispieles, bei dem ein Metallbalg verwendet wird, im einzel- nen erläutert. Die einzige Figur zeigt einen Längsschnitt des Ausführungsbeispiels des Druckspeichers.The invention is explained in detail below with reference to an exemplary embodiment shown in the drawing, in which a metal bellows is used. The single figure shows a longitudinal section of the embodiment of the pressure accumulator.
Das dargestellte Ausführungsbeispiel des Druckspeichers ist insbesondere für eine Verwendung bei elektrohydraulischen Bremsanlagen vorgesehen und weist ein als Ganzes mit 1 bezeichnetes Speichergehäuse auf. Dieses weist einen im wesentlichen kreiszylinderförmigen Hauptteil 3 auf, der einerseits durch einen angeschweißten Bodendeckel 5 und andererseits durch eine angeschweißte, flach gewölbte Endkappe 7 verschlossen ist. Im Bo- dendeckel 5 ist ein zentraler Hydraulikanschluß 9 mit Durchlässen 1 1 für Zu- und Abfluß eines Hydraulikfluidums zum Olraum 13 innerhalb des Speichergehäuses 1 vorgesehen. An der Endkappe 7 ist eine zentral gelegene Gas-Füllöffnung vorgesehen, die durch einen Stopfen 15 verschlossen ist und es ermöglicht, durch Befüllen mit einem kompressiblen Gas im an- grenzenden Gasraum 17 des Speichergehäuses 1 einen gewünschten Gas- Vorfülldruck herzustellen, beispielsweise durch Befüllen mit Stickstoff.The illustrated embodiment of the pressure accumulator is intended in particular for use in electrohydraulic brake systems and has a accumulator housing designated as a whole as 1. This has an essentially circular-cylindrical main part 3, which is closed on the one hand by a welded-on base cover 5 and on the other hand by a welded-on, flat-curved end cap 7. A central hydraulic connection 9 with passages 11 for the inflow and outflow of a hydraulic fluid to the oil space 13 within the storage housing 1 is provided in the floor cover 5. A centrally located gas filling opening is provided on the end cap 7, which is closed by a stopper 15 and enables a desired gas pre-filling pressure to be produced by filling with a compressible gas in the adjoining gas space 17 of the storage housing 1, for example by filling it with Nitrogen.
Als Trennelement zwischen diesem Gasraum 17 und dem Olraum 13, mit dem ein nicht gezeigtes Hydrauliksystem über den Hydraulikanschluß 9 in Verbindung ist, dient ein Metallbalg 19, der eine kreiszylindrische Form besitzt und am einen Ende mit dem Bodendeckel 5 fest verbunden ist. Der Außendurchmesser des Metallbalges 19 ist etwas geringer als der Innendurchmesser des zylindrischen Hauptteiles 3 des Speichergehäuses 1. An seinem dem Bodendeckel 5 entgegengesetzten freien Ende ist der Metall- balg 19 durch einen Abschlußkörper in Form eines Troges 21 dicht verschlossen. Dieser ist beim gezeigten Ausführungsbeispiel kreiszylindrisch geformt und weist einen Außendurchmesser auf, der etwas geringer ist als der Innendurchmesser des Metallbalges 19. Der Trog 21 ist an seinem offenen Ende 23 mit einem nach außen umgelegten, flanschartigen Rand 25 am zugeordneten freien Ende des Metallbalges 19 befestigt, so daß sich die Seitenwand 27 des Troges 21 längs der Innenseite des den Trog umringenden Metalibalges 19 erstreckt und der Innenraum des Metallbalges 19 lediglich mit dem schmalen Ringraum 29 zwischen der Außenseite der SeitenwandA metal bellows 19, which has a circular cylindrical shape and is firmly connected at one end to the bottom cover 5, serves as a separating element between this gas space 17 and the oil space 13, with which a hydraulic system (not shown) is connected via the hydraulic connection 9. The outer diameter of the metal bellows 19 is slightly smaller than the inner diameter of the cylindrical main part 3 of the storage housing 1. At its free end opposite the bottom cover 5, the metal bellows 19 is sealed by a closing body in the form of a trough 21. In the exemplary embodiment shown, this is circular-cylindrical in shape and has an outer diameter which is somewhat smaller than the inner diameter of the metal bellows 19. The trough 21 is fastened at its open end 23 to the associated free end of the metal bellows 19 with a flange-like edge 25 which is folded outwards , so that the side wall 27 of the trough 21 extends along the inside of the metal bellows 19 surrounding the trough and the interior of the metal bellows 19 merely with the narrow annular space 29 between the outside of the side wall
27 des Troges 21 und der Innenseite des Metallbalges 19 einen Teil des Ölraumes 1 3 bildet.27 of the trough 21 and the inside of the metal bellows 19 forms part of the oil space 1 3.
Der Gasraum 1 7 hingegen hat ein demgegenüber weit größeres Volumen, weil innerhalb des Speichergehäuses 1 als Gasraum nicht nur der RingraumThe gas space 17, on the other hand, has a much larger volume because not only the annular space within the storage housing 1 as the gas space
28 an der Außenseite des Metallbalges 19 und der an die obere Endkappe 7 angrenzende Raum zur Verfügung steht, sondern zusätzlich auch der gesamte Innenraum des Troges 21.28 on the outside of the metal bellows 19 and the space adjoining the upper end cap 7, but also the entire interior of the trough 21.
Dem Hydraulikanschluß 9 ist ein doppelt wirkendes Ölventil 31 zugeordnet, das zwei den Durchstrom von Hydraulikfluidum durch die Durchlässe 1 1 in jeweils zueinander entgegengesetzter Strömungsrichtung sperrende oder freigebende Ventileinheiten aufweist, die durch Bewegungen des Me- tallbalges 19 und damit des Troges 21 steuerbar sind, wenn sich der Metallbalg 19 aufgrund von Druckdifferenzen im Olraum 1 3 und dem Gasraum 1 7 zusammenzieht oder auszieht und der Trog 21 eine entsprechende Bewegung längs der zentralen Längsachse 33 des Speichergehäuses 1 ausführt. Die Tiefe des Troges 21 ist so bemessen, daß bei unbelastetem Me- tallbalg 19, zum Beispiel wenn sowohl Ölrauml 3 als auch Gasraum 1 7 drucklos sind, sich der Trogboden 35 bis in die Nähe der Innenwand 37 des Bodendeckels 5 erstreckt. Der Trogboden 35 ist als kreisrunder Ventilteller gestaltet, der mit der benachbarten Innenwand 37, die als zugeordneter Ventilsitz gestaltet ist, die eine der genannten Ventileinheiten bildet. Zur Bildung von Dichtflächen sind ein O-Ring 39 am radial außenliegenden Rand des Trogbodens 35 sowie ein O-Ring 41 an der Innenwand 37 des Bodendeckels 5 vorgesehen, wobei die O-Ringe 39 und 41 jeweils in entsprechenden Ringnuten aufgenommen sind. Durch den aufgrund des Durchmessers des Troges 21 bedingten, verhältnismäßig großen radialen Abstand der Dichtflächen von der zentralen Längsachse 33 ist eine großflächige Abdichtung und damit ein sehr sicheres Sperren des Ventiles gewährleistet. Die zweite Ventileinheit weist einen Ventilkörper 43 auf, der über einen am Trogboden 35 befestigten Ventilstößel 45 zusammen mit dem Trog 21 beweglich ist. Der Ventilstößel 45 erstreckt sich durch eine zentrale Bohrung 47 im Bodendeckel 5 aus dem Speichergehäuse 1 heraus. Der Ventilkörper 43 wirkt mit einem im Hydraulikanschluß 9 ausgebildeten Ventilsitz 49 zusammen und weist einen an den Ventilsitz anlegbaren O-Ring 50 auf.The hydraulic connection 9 is assigned a double-acting oil valve 31, which has two valve units which block or release the flow of hydraulic fluid through the passages 11 in opposite flow directions, which are controllable by movements of the metal bellows 19 and thus of the trough 21 if the metal bellows 19 contracts or expands due to pressure differences in the oil space 1 3 and the gas space 17 and the trough 21 executes a corresponding movement along the central longitudinal axis 33 of the storage housing 1. The depth of the trough 21 is dimensioned such that when the metal bellows 19 is unloaded, for example when both the oil chamber 3 and the gas chamber 17 are depressurized, the trough bottom 35 extends into the vicinity of the inner wall 37 of the bottom cover 5. The trough bottom 35 is designed as a circular valve plate, which, with the adjacent inner wall 37, which is designed as an associated valve seat, forms one of the valve units mentioned. To form sealing surfaces, an O-ring 39 is provided on the radially outer edge of the trough bottom 35 and an O-ring 41 on the inner wall 37 of the bottom cover 5, the O-rings 39 and 41 being received in corresponding ring grooves. Due to the relatively large radial distance of the sealing surfaces from the central longitudinal axis 33 due to the diameter of the trough 21, a large-area sealing and thus a very secure locking of the valve is ensured. The second valve unit has a valve body 43 which can be moved together with the trough 21 via a valve tappet 45 fastened to the trough bottom 35. The valve lifter 45 extends out of the storage housing 1 through a central bore 47 in the base cover 5. The valve body 43 interacts with a valve seat 49 formed in the hydraulic connection 9 and has an O-ring 50 which can be placed on the valve seat.
Wie ersichtlich ist, bewegt sich der Trog 21 bei einem Zusammenziehen des Metallbalges 19 aufgrund eines Überdruckzustandes im Gasraum 1 7 gegenüber dem Olraum 13 mit seinem als Ventilteller dienenden Trogboden 35 an die Innenwand 37 des Bodendeckels 5, so daß die O-Ringe 39 und 41 zur Anlage an entsprechende Flächen von Ventilsitz bzw. Ventilteller kommen und ein Abfluß von Hydraulikfluidum durch die Durchlässe 1 1 aus dem Olraum 13 gesperrt wird. Wenn andererseits im Olraum 13 ein höherer Druck herrscht als im Gasraum 17, führt eine entsprechende Verschiebebewegung des Troges 21 über den Ventilstößel 45 zu einer Bewegung des Ventilkörpers 43, der durch Anlage des O-Ringes 50 am Ventilsitz 49 den Zustrom von Hydraulikfluidum zum Olraum 13 sperrt, so daß wie- derum der Zustand des Druckausgleiches zwischen Olraum 13 und Gasraum 1 7 entsteht. Dies bedeutet, daß der erfindungsgemäße Druckspeicher durch das Vorhandensein des doppelt wirkenden Ventiles 31 , also dadurch, daß sowohl der Abfluß von Hydraulikfluidum als auch der Zustrom von Hydraulikfluidum gesteuert wird, im Betrieb hinsichtlich der Beibehaltung des Druckausgleiches am Metallbalg 19 selbststeuernd arbeitet, wodurch höchste Betriebssicherheit über lange Betriebszeiträume gewährleistet ist und Metallbälge leichter Bauweise entsprechend vorteilhaft zum Einsatz kommen können. Zudem ergibt sich dadurch, daß als Abschluß des offenen Endes des Metallbalges 19 ein sich ins Innere des Metallbalges 19 erstrek- kender Trog 21 vorgesehen ist, nicht nur der Vorteil der vereinfachtenAs can be seen, the trough 21 moves when the metal bellows 19 contracts due to an overpressure state in the gas chamber 17 relative to the oil chamber 13 with its trough bottom 35 serving as a valve plate on the inner wall 37 of the bottom cover 5, so that the O-rings 39 and 41 come to rest on corresponding surfaces of the valve seat or valve plate and an outflow of hydraulic fluid through the passages 11 from the oil space 13 is blocked. If, on the other hand, there is a higher pressure in the oil chamber 13 than in the gas chamber 17, a corresponding displacement movement of the trough 21 via the valve tappet 45 leads to a movement of the valve body 43 which, by the O-ring 50 being in contact with the valve seat 49, causes the inflow of hydraulic fluid to the oil chamber 13 blocks, so that again the state of pressure equalization between oil space 13 and gas space 17 is created. This means that the pressure accumulator according to the invention, by the presence of the double-acting valve 31, that is to say in that both the outflow of hydraulic fluid and the inflow of hydraulic fluid are controlled, operates in a self-controlling manner in operation with regard to maintaining the pressure equalization on the metal bellows 19, as a result of which maximum operational reliability is guaranteed over long periods of operation and metal bellows of light construction can be used advantageously accordingly. It also results from the fact that a trough 21 extending into the interior of the metal bellows 19 is provided as the end of the open end of the metal bellows 19, not only the advantage of the simplified one
Bauweise des Ventils durch Verwendung des Trogbodens 35 als bewegliches Ventilglied, sondern der besondere Vorteil, daß praktisch das gesamte Volumen des Troges 21 als Teilvolumen des Gasraumes 1 zur Verfügung steht.Construction of the valve by using the trough bottom 35 as a movable valve member, but the special advantage that practically the whole Volume of the trough 21 is available as a partial volume of the gas space 1.
Es versteht sich, daß anstelle des beim beschriebenen Beispiel gezeigten Metallbalges 19 auch ein nichtmetallischer Balg vorgesehen sein kann. It goes without saying that instead of the metal bellows 19 shown in the example described, a non-metallic bellows can also be provided.

Claims

P a t e n t a n s p r ü c h eP a t e n t a n s r u c h e
1) Hydropneumatischer Druckspeicher mit einem innerhalb des Speichergehäuses (1 ) einen Gasraum (1 7) von einem Olraum (13) tren- nenden Balg (19), insbesondere einem Metallbalg, der an seinem einen Ende am Speichergehäuse (1 ) so befestigt ist, daß der Olraum (1 3) an die Innenseite des Balges (19) angrenzt, der an seinem freien anderen Ende durch einen entsprechend Volumenänderungen von Gasraum (1 7)und Olraum (13) beweglichen Abschlußkörper (21 ) verschlossen ist, und mit einem das Strömen von Hydraulikfluidum aus dem und in den Olraum (13) freigebenden oder sperrenden Ventil (31 ), das bei einer Bewegung des Abschlußkörpers (21 ), die einer einen vorgegebenen Größtwert übersteigenden Vergrößerung des Volumens des Gasraumes (17) entspricht, durch den Abschlußkörper (21) in seine sperrende Stellung überführbar ist, dadurch gekennzeichnet, daß der Abschlußkörper in Form eines Troges (21 ) ausgebildet ist, daß der Trog (21 ) mit seinem am offenen Ende (23) befindlichen Rand (25) mit dem zugeordneten freien Ende des Balges (19) verbunden ist, daß der Trog (21) sich mit seiner Seitenwand (27) längs der Innenseite des Balges (19) erstreckt und daß der Boden (35) des Troges (21) als bewegliches Ventilglied des das Strömen von Hydraulikfluidum steuernden Ventiles (31) ausgebildet ist.1) Hydropneumatic pressure accumulator with a bellows (19) separating a gas space (17) from an oil space (13) within the storage housing (1), in particular a metal bellows which is attached at one end to the storage housing (1) in such a way that the oil space (1 3) adjoins the inside of the bellows (19), which is closed at its free other end by a corresponding volume change of gas space (1 7) and oil space (13) movable end body (21), and with one Flow of hydraulic fluid from and into the oil space (13) releasing or blocking valve (31), which upon movement of the closing body (21), which corresponds to an increase in volume of the gas space (17) exceeding a predetermined maximum value, through the closing body ( 21) can be moved into its blocking position, characterized in that the closing body is designed in the form of a trough (21), that the trough (21) is located at the open end (23) ichen edge (25) is connected to the associated free end of the bellows (19), that the trough (21) extends with its side wall (27) along the inside of the bellows (19) and that the bottom (35) of the trough ( 21) is designed as a movable valve member of the valve (31) controlling the flow of hydraulic fluid.
2) Hydropneumatischer Druckspeicher nach Anspruch 1 , dadurch ge- kennzeichnet, daß der Trog (21) kreiszylindrisch geformt ist und seine Tiefe so bemessen ist, daß sein als Ventilglied dienender Boden (35) als kreisrunder beweglicher Ventilteller mit einem Ventilsitz zusammenwirkt, der an der Innenwand (37) des Speichergehäuses (1 ) ausgebildet ist.2) Hydropneumatic pressure accumulator according to claim 1, characterized in that the trough (21) is circular cylindrical in shape and its depth is dimensioned such that its bottom serving as a valve member (35) cooperates as a circular movable valve plate with a valve seat which acts on the Inner wall (37) of the storage housing (1) is formed.
3) Hydropneumatischer Druckspeicher nach Anspruch 2, dadurch gekennzeichnet, daß der Ventilsitz konzentrisch zur zentralen Längs- achse (33) des als Rotationskörper gestalteten Speichergehäuses (1 ) angeordnet ist und einen Durchlaß (1 1 ) für Hydraulikfluidum umgibt.3) Hydropneumatic pressure accumulator according to claim 2, characterized in that the valve seat is concentric with the central longitudinal Axis (33) of the storage housing (1) designed as a rotating body is arranged and surrounds a passage (1 1) for hydraulic fluid.
4) Hydropneumatischer Druckspeicher nach Anspruch 3, dadurch gekennzeichnet, daß konzentrisch zur Längsachse (33) Dichtflächen (39, 41) am Ventilteller und am Ventilsitz in deren jeweils radial außenliegendem Randbereich vorgesehen sind.4) Hydropneumatic pressure accumulator according to claim 3, characterized in that concentric to the longitudinal axis (33) sealing surfaces (39, 41) on the valve plate and on the valve seat are provided in their radially outer edge region.
5) Hydropneumatischer Druckspeicher nach Ansprüche 3 oder 4, dadurch gekennzeichnet, daß ein am Trogboden (35) befestigter Ventilstößel (45) vorgesehen ist, der sich konzentrisch zur Längsachse (33) aus dem Speichergehäuse (1 ) erstreckt und mit einem zweiten beweglichen Ventilglied (43) verbunden ist, das bei einer einem vor- gegebenen Kleinstwert des Volumens des Gasraumes (1 7) übersteigenden Bewegung des Troges (21) mit einem das Strömen von Hydraulikfluidum in den Olraum (13) sperrenden, zweiten Ventilsitz (49) zusammenwirkt.5) Hydropneumatic pressure accumulator according to claims 3 or 4, characterized in that a valve tappet (45) attached to the trough bottom (35) is provided, which extends concentrically to the longitudinal axis (33) from the accumulator housing (1) and with a second movable valve member ( 43) which, in the event of a movement of the trough (21) exceeding a predetermined minimum value of the volume of the gas space (17), interacts with a second valve seat (49) which blocks the flow of hydraulic fluid into the oil space (13).
6) Hydropneumatischer Druckspeicher nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß Dichtflächen an den beweglichen Ventilgiiedem und/oder zugeordneten Ventilsitzen durch in Ringnuten sitzende O-Ringe (39, 41 ) gebildet sind. 6) Hydropneumatic pressure accumulator according to one of claims 1 to 5, characterized in that sealing surfaces on the movable Ventilgiiedem and / or associated valve seats are formed by O-rings (39, 41) seated in annular grooves.
EP01902324A 2000-01-29 2001-01-17 Hydropneumatic accumulator Expired - Lifetime EP1250533B1 (en)

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DE10003648A1 (en) 2001-08-09
ATE295941T1 (en) 2005-06-15
US20030000589A1 (en) 2003-01-02
DE50106255D1 (en) 2005-06-23
US6622755B2 (en) 2003-09-23
ES2240397T3 (en) 2005-10-16
EP1250533B1 (en) 2005-05-18
WO2001055602A1 (en) 2001-08-02
JP2003521643A (en) 2003-07-15
JP3971188B2 (en) 2007-09-05

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