EP2202412B1 - Hydraulic accumulator - Google Patents

Hydraulic accumulator Download PDF

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Publication number
EP2202412B1
EP2202412B1 EP09015615A EP09015615A EP2202412B1 EP 2202412 B1 EP2202412 B1 EP 2202412B1 EP 09015615 A EP09015615 A EP 09015615A EP 09015615 A EP09015615 A EP 09015615A EP 2202412 B1 EP2202412 B1 EP 2202412B1
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EP
European Patent Office
Prior art keywords
housing
shells
housing shells
hydraulic accumulator
membrane
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EP09015615A
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German (de)
French (fr)
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EP2202412A1 (en
Inventor
Herbert Baltes
Norbert Weber
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Hydac Technology GmbH
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Hydac Technology GmbH
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Publication of EP2202412A1 publication Critical patent/EP2202412A1/en
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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
    • F15B1/10—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating means
    • F15B1/106—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating means characterised by the way housing components are assembled
    • 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
    • F15B2201/3151—Accumulator separating means having flexible separating means the flexible separating means being diaphragms or membranes
    • 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
    • F15B2201/405—Housings
    • F15B2201/4053—Housings characterised by the material
    • 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
    • F15B2201/405—Housings
    • F15B2201/4056—Housings characterised by the attachment of housing components
    • 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
    • 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
    • F15B2201/60—Assembling or methods for making accumulators
    • F15B2201/605—Assembling or methods for making housings therefor

Definitions

  • the invention relates to a hydraulic accumulator having at least two housing shells in the form of rotational bodies with respect to the longitudinal axis of the storage housing and with at least one fuel element which preferably separates media inside the housing formed by the housing shells from one another, wherein the housing shells with their free end faces to form the storage housing are in juxtaposition, and wherein the individual housing shells are connected to each other in a pressure-tight manner by means of an externally applied Faserumwicklung or at least one applied Fasergeleges.
  • the DE 10 2006 004 120 A1 also discloses a hydraulic accumulator in the form of a diaphragm accumulator, in which, in addition to metallic housing parts which each form a connection region on the gas side and on the fluid side of the accumulator, a reinforcing winding of a fiber material is provided as a further housing component.
  • hydraulic accumulators have to meet different requirements. Particularly high demands are to be met if such accumulators are used in hydraulic systems of sophisticated motor vehicles. This is particularly the case when it is intended to be used in competition vehicles, such as Formula racing cars. In these cases, the respective hydraulic accumulators must not only cope with high loads, both in terms of mechanical loads, static and dynamic nature, including extremely high pressure loads, but it is also imperative that the reliability, despite the high load, with the lowest construction weight of the memory is reached.
  • a hydraulic accumulator of the type mentioned is out GB 948,675 A known.
  • the membrane arranged within the storage housing has on the outer peripheral side a connection region which is shaped such that the opening edges of the housing shells can each engage in an annular groove.
  • the housing shells in the connected state are spaced apart from one another at the end by the membrane arranged therebetween, the membrane additionally ensuring a fluid-tight separation of the two working spaces provided in the accumulator housing.
  • the invention has the object to provide a hydraulic accumulator of the type considered available, which, although he is able to cope with the mentioned, high loads, characterized by a minimum construction weight.
  • a significant feature of the invention is that the mutually facing opening edges of the preferably metallic housing shells overlap each other such that the effective in the overlap area, generated by the convolution formed from a fiber composite material supporting force and this counteracting, generated due to internal pressure in the storage enclosure pressure force a Clamping force in the overlap area as a holding force for the mutual anchoring of the opening edges of the shells form.
  • This type of mutual anchoring ensures the simplest design and lowest construction weight pressure resistance of the housing at very high operating pressures, for example, at pressure peaks up to 250 bar or more, even at low wall thickness of the shells, due to serving as an abutment outer support by wrapping the internal pressure reinforced in the storage housing, the clamping forces against the counter-bearing formed by the winding.
  • the housing shell forming the housing shells are pressure-tightly connected to one another at their mutually facing end sides by means of an externally applied wrapping made of a fiber composite material or by means of a Fasergelegecitedes.
  • the arrangement according to the invention is such that the opening edge of that housing shell, which is radially inwardly in the overlap region, forms an approximately C-shaped hollow profile for receiving the at least one separating element.
  • the arrangement is such that the opening edge of the housing shell in the overlap region or at the overlapping point radially outer shell to form a paragraphless transition of the outer surface of the two housing shells rests against an annular surface which is formed by a step which is provided at the opening edge of the other housing shell at the transition to the hollow profile. This results in not only a formed by the outside of the wrap, paragraphless, smooth outer contour of the storage enclosure, but the housing shells are additionally secured against a relative axial movement directed against each other.
  • the movable separating element may be formed by a membrane whose peripheral edge engages in the overlapping region with an anchoring part between the opening edges of the housing shells so that the clamping force acting in the overlapping region forms the holding force for anchoring the anchoring part of the membrane to the opening edges of the housing shells ,
  • the clamping force acting in the overlapping area is simultaneously available as a holding force for the anchoring of the membrane, which leads to a particularly significant simplification of the construction.
  • the anchoring part at the peripheral edge of the membrane can preferably be formed by a thickened edge bead of the membrane, which thus forms a kind of sealing ring at the anchoring point.
  • the hollow profile preferably forms a radially inwardly and at a distance thereof radially outwardly extending legs, between which the edge bead of the membrane can be accommodated, on its outer side at the Inside the overlapping opening edge of the other housing shell rests.
  • the housing shells are formed from an aluminum alloy, resulting in a particularly low weight despite high load capacity.
  • the terminals of the housing shells are formed by coaxial to the longitudinal axis, integrally formed connection body to which the wall of the respective housing shell with respect to the thickness of the connecting body of reduced wall thickness connects.
  • Particularly good strength properties result when the wrapping forms a thickening in the region of the transition between connection body and reduced wall thickness of the housing shell.
  • the wrapping also acts as a reinforcement of the relevant connection body against acting during operation on him load forces or vibrations.
  • the wrapping may be formed of a material containing carbon, Kevlar ® -, glass, boron, Al 2 O 3 fibers or a mixture containing thereof.
  • an approximately pear-shaped to a longitudinal axis 3 rotationally symmetrical storage housing is designated as a whole with 1.
  • This has, arranged concentrically to the axis 3, a connection body 5 and a connection body 7, wherein the connection body 5 an inlet 9 for filling the adjoining gas side 11 with a working gas, preferably N 2 , while the connection body 7 has a fluid inlet 13 as Connection with a fluid side 15 forms.
  • these metallic housing parts each form a rotationally symmetrical to the axis 3, thin-walled shell, wherein the top in the drawing shell 17 and the underlying shell are designated 19.
  • the overlapping region 21 of the shells 17 and 19 is designed so that in the transition region 21, a membrane 33 formed of elastomeric material is both mechanically fixed to the storage housing 1 with its peripheral edge and forms a seal between the gas side 11 and the fluid side 15.
  • the membrane 33 has in this regard a peripheral edge bead 35, which is clamped between the opening edge 25 of the outer region 21 on the overlapping region 21 and the opening edge 23 of the inner shell 17.
  • the opening edge 23 of the upper shell 17 forms a radially inwardly drawn hollow profile approximately C-shaped configuration, with a radially inwardly extending leg 37 and an axial distance from this, radially to outside striving leg 39, which overlap between the edge bead 35 of the membrane 33, the outside of the smooth-surface opening edge 25 of the lower shell 19 abuts.
  • This configuration of the overlapping region 21 not only results in a mechanically secure and fluid-tight clamping of the membrane 33 at its thickened bead 35, but also leads to a clamping of the overlapping end edges 23, 25 of the shells 17 and 19.
  • the upper shell 17 forms on Transition to the hollow profile, a step 41 for forming a radially retracted annular surface on which the smooth-surfaced opening edge 25 of the lower shell 19 is applied so that the transition of the two shells 17 and 19 on the overlap region 21 on the outside is without offset, so that the reinforcing wrap 27 at her Outside one also in the overlap region 21 smooth-surfaced, choppy contour forms.
  • the step 41 also forms a backup of the shells 17 and 19 against a mutually directed axial movement due to the generated by the wrapping 27, acting on the shells 17, 19 supporting force.
  • a formed from a fiber composite wrap 27 which may be designed in a conventional manner, therefore, results in conjunction with shells formed from an aluminum material 17, 19 a very high pressure resistance and reliability in the simplest design and in particular at a minimum in construction weight.
  • the reinforcing wrap 27 may be formed from a fiber reinforcement such as carbon, aramid, glass, boron, ALO 3 fibers or mixtures thereof.
  • these fibers are embedded in a base matrix of thermosets, such as epoxy or phenolic resins, or in thermoplastics.
  • FIG. 3 shown embodiment differs from the example first described basically only insofar as at the transition regions 29, 31 between the connecting bodies 5 and 7 and the adjoining thin-walled portion of the shells 17, 19, wherein in Fig. 3 only the transition region 29 is shown on the shell 17, the wrapping 27 each forms a thickening region 45.
  • This thickening region conforms to an axially extending, cylindrical outer surface 47 of the respective connection body 5, 7 in such a way that the winding 27 surrounds a connection body 5, 7
  • Reinforcing ring forms, which supports the respective connection body 5, 7 relative to the thin-walled shell part and thus forms a reinforcement of the connection body 5 and 7 relative to the rest of the storage housing 1, whereby mechanical, static or dynamic, acting on the connection bodies 5, 7 forces in the reinforcing wrapping 27 are introduced, resulting in a particularly high level of operational reliability under heavy loads, as they can occur, for example, in competition vehicles in racing.
  • the winding has been optimized insofar as a substantially constant thickness is maintained along the circumference of the housing.
  • the winding is chosen differently from the width or thickness, in particular the thickness of the winding increases in the direction of the upper terminal. In such a way, however, it is also possible to compensate for these at places of high stress by an increasingly applied winding.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Braking Arrangements (AREA)

Abstract

The accumulator has a separating element separating inner working chambers within an accumulator housing (1) from each other, where the housing is formed by housing shells. The shells are connected with each other at its front sides by a fiber winding or a fiber clutch in a pressure-sealed manner, and are made of aluminum alloy. The winding is made of a material e.g. carbon-, Kevlar(RTM: para-aramid synthetic fiber), glass-, boron- or alumina fiber. The shells are provided in form of rotational bodies with respect to a longitudinal axis (3) of the housing.

Description

Die Erfindung betrifft einen Hydrospeicher mit mindestens zwei Gehäuseschalen in Form von Rotationskörpern bezüglich der Längsachse des Speichergehäuses und mit mindestens einem Brennelement, das innerhalb des mittels der Gehäuseschalen gebildeten Gehäuses einzelne Arbeitsräume vorzugsweise mediendicht voneinander trennt, wobei zur Bildung des Speichergehäuses die Gehäuseschalen mit ihren freien Stirnseiten in Aneinanderlage sind, und wobei die einzelnen Gehäuseschalen mittels einer von außen aufgebrachten Faserumwicklung oder mindestens eines aufgebrachten Fasergeleges druckdicht miteinander verbunden sind.The invention relates to a hydraulic accumulator having at least two housing shells in the form of rotational bodies with respect to the longitudinal axis of the storage housing and with at least one fuel element which preferably separates media inside the housing formed by the housing shells from one another, wherein the housing shells with their free end faces to form the storage housing are in juxtaposition, and wherein the individual housing shells are connected to each other in a pressure-tight manner by means of an externally applied Faserumwicklung or at least one applied Fasergeleges.

Bei Druckbehältern zur Speicherung flüssiger oder gasförmiger, unter Druck stehender Medien ist es Stand der Technik (vgl. DE 10 2006 004 121 A1 ), das betreffende Speichergehäuse in Composite-Bauweise derart zu realisieren, dass eine verstärkende Umwicklung aus Faserverbundwerkstoffen einen Bestandteil des Speichergehäuses bildet. Die DE 10 2006 004 120 A1 offenbart auch einen Hydrospeicher in Form eines Membranspeichers, bei dem zusätzlich zu metallischen Gehäuseteilen, die jeweils einen Anschlussbereich an der Gasseite und an der Fluidseite des Speichers bilden, als weiteres Gehäusebestandteil eine verstärkende Umwicklung aus einem Fasermaterial vorgesehen ist.In pressure vessels for storing liquid or gaseous, pressurized media, it is state of the art (see. DE 10 2006 004 121 A1 ), to realize the respective memory housing in composite construction such that a reinforcing wrapping of fiber composites forms a part of the storage enclosure. The DE 10 2006 004 120 A1 also discloses a hydraulic accumulator in the form of a diaphragm accumulator, in which, in addition to metallic housing parts which each form a connection region on the gas side and on the fluid side of the accumulator, a reinforcing winding of a fiber material is provided as a further housing component.

Je nach Einsatzgebiet müssen Hydrospeicher unterschiedlichen Anforderungen gerecht werden. Besonders hohe Anforderungen sind zu erfüllen, wenn derartige Speicher in Hydrauliksystemen hoch entwickelter Kraftfahrzeuge benutzt werden. Dies ist in besonderem Maße der Fall, wenn ein Einsatz bei Wettbewerbsfahrzeugen, wie Formelrennwagen, vorgesehen ist. In diesen Fällen müssen die betreffenden Hydrospeicher nicht nur hohen Belastungen gewachsen sein, und zwar sowohl hinsichtlich mechanischer Belastungen, statischer und dynamischer Natur, einschließlich äußerst hoher Druckbelastungen, sondern es ist darüber hinaus zwingend, dass die Betriebssicherheit, trotz der hohen Belastung, bei geringstem Baugewicht des Speichers erreicht wird.Depending on the application, hydraulic accumulators have to meet different requirements. Particularly high demands are to be met if such accumulators are used in hydraulic systems of sophisticated motor vehicles. This is particularly the case when it is intended to be used in competition vehicles, such as Formula racing cars. In these cases, the respective hydraulic accumulators must not only cope with high loads, both in terms of mechanical loads, static and dynamic nature, including extremely high pressure loads, but it is also imperative that the reliability, despite the high load, with the lowest construction weight of the memory is reached.

Ein Hydrospeicher der eingangs genannten Art ist aus GB 948,675 A bekannt geworden. Die innerhalb des Speichergehäuses angeordnete Membran weist außenumfangsseitig einen Verbindungsbereich auf, der derart geformt ist, dass die Öffnungsränder der Gehäuseschalen jeweils in eine ringförmig Nut eingreifen können. Bei dem bekannten Hydrospeicher sind die Gehäuseschalen im verbundenen Zustand stirnseitig durch die dazwischen angeordnete Membran voneinander beabstandet, wobei die Membran zusätzlich eine fluiddichte Trennung der beiden im Speichergehäuse vorgesehenen Arbeitsräume sicherstellt.A hydraulic accumulator of the type mentioned is out GB 948,675 A known. The membrane arranged within the storage housing has on the outer peripheral side a connection region which is shaped such that the opening edges of the housing shells can each engage in an annular groove. In the known hydraulic accumulator, the housing shells in the connected state are spaced apart from one another at the end by the membrane arranged therebetween, the membrane additionally ensuring a fluid-tight separation of the two working spaces provided in the accumulator housing.

Im Hinblick auf diese Problematik stellt sich die Erfindung die Aufgabe, einen Hydrospeicher der betrachteten Art zur Verfügung zu stellen, der sich, obgleich er den erwähnten, hohen Belastungen gewachsen ist, durch ein minimales Baugewicht auszeichnet.In view of this problem, the invention has the object to provide a hydraulic accumulator of the type considered available, which, although he is able to cope with the mentioned, high loads, characterized by a minimum construction weight.

Erfindungsgemäß ist diese Aufgabe durch einen Hydrospeicher gelöst, der die Merkmale des Patentanspruches 1 in seiner Gesamtheit aufweist.According to the invention this object is achieved by a hydraulic accumulator having the features of claim 1 in its entirety.

Demgemäß besteht eine wesentliche Besonderheit der Erfindung darin, dass die einander zugekehrten Öffnungsränder der vorzugsweise metallischen Gehäuseschalen einander derart überlappen, dass die im Überlappungsbereich wirksame, durch die aus einem Faserverbundmaterial gebildete Umwicklung erzeugte Abstützkraft und die dieser entgegenwirkende, aufgrund von Innendruck im Speichergehäuse erzeugte Druckkraft eine Klemmkraft im Überlappungsbereich als Haltekraft für die gegenseitige Verankerung der Öffnungsränder der Schalen bilden. Diese Art der gegenseitigen Verankerung gewährleistet bei einfachster Bauweise und geringstem Baugewicht eine Druckfestigkeit des Gehäuses bei sehr hohen Betriebsdrücken, beispielsweise bei Druckspitzen bis 250 bar oder mehr, selbst bei geringen Wandstärken der Schalen, wobei aufgrund der als Gegenlager dienenden äußeren Abstützung durch die Umwicklung der Innendruck im Speichergehäuse die Klemmkräfte gegenüber dem durch die Umwicklung gebildeten Gegenlager verstärkt.Accordingly, a significant feature of the invention is that the mutually facing opening edges of the preferably metallic housing shells overlap each other such that the effective in the overlap area, generated by the convolution formed from a fiber composite material supporting force and this counteracting, generated due to internal pressure in the storage enclosure pressure force a Clamping force in the overlap area as a holding force for the mutual anchoring of the opening edges of the shells form. This type of mutual anchoring ensures the simplest design and lowest construction weight pressure resistance of the housing at very high operating pressures, for example, at pressure peaks up to 250 bar or more, even at low wall thickness of the shells, due to serving as an abutment outer support by wrapping the internal pressure reinforced in the storage housing, the clamping forces against the counter-bearing formed by the winding.

Die das Speichergehäuse bildenden Gehäuseschalen sind an ihren einander zugewandten Stirnseiten mittels einer von außen aufgebrachten Umwicklung aus einem Faserverbundwerkstoff oder mittels eines Fasergelegeauftrages druckdicht miteinander verbunden. Bei einfachster Bauweise und dadurch minimalem Baugewicht ist dadurch ein Hydrospeicher geschaffen, der bei hohen Belastungen, seien es mechanische, statische oder dynamische Belastungen und/oder Druckbelastungen und/oder thermische Belastungen, ein Höchstmaß an Betriebssicherheit gewährleistet.The housing shell forming the housing shells are pressure-tightly connected to one another at their mutually facing end sides by means of an externally applied wrapping made of a fiber composite material or by means of a Fasergelegeauftrages. With the simplest construction and thus minimum structural weight of a hydraulic accumulator is created, which ensures high levels of reliability at high loads, be it mechanical, static or dynamic loads and / or pressure loads and / or thermal loads.

Die Anordnung ist erfindungsgemäß so getroffen, dass der Öffnungsrand derjenigen Gehäuseschale, die im Überlappungsbereich radial innenliegend ist, ein annähernd C-förmiges Hohlprofil zur Aufnahme des mindestens einen Trennelements bildet. Erfindungsgemäß ist die Anordnung so getroffen, dass der Öffnungsrand der im Überlappungsbereich bzw. an der Überlappungsstelle radial außenliegenden Gehäuseschale zur Bildung eines absatzlosen Überganges der Außenfläche beider Gehäuseschalen an einer Ringfläche anliegt, die durch eine Stufe gebildet ist, die am Öffnungsrand der anderen Gehäuseschale am Übergang zum Hohlprofil vorgesehen ist. Dadurch ergibt sich nicht nur eine durch die Außenseite der Umwicklung gebildete, absatzlose, glatte Außenkontur des Speichergehäuses, sondern die Gehäuseschalen sind zusätzlich gegen eine gegeneinander gerichtet relative Axialbewegung gesichert.The arrangement according to the invention is such that the opening edge of that housing shell, which is radially inwardly in the overlap region, forms an approximately C-shaped hollow profile for receiving the at least one separating element. According to the invention, the arrangement is such that the opening edge of the housing shell in the overlap region or at the overlapping point radially outer shell to form a paragraphless transition of the outer surface of the two housing shells rests against an annular surface which is formed by a step which is provided at the opening edge of the other housing shell at the transition to the hollow profile. This results in not only a formed by the outside of the wrap, paragraphless, smooth outer contour of the storage enclosure, but the housing shells are additionally secured against a relative axial movement directed against each other.

In besonders vorteilhafter Weise kann das bewegbare Trennelement durch eine Membran gebildet sein, deren Umfangsrand im Überlappungsbereich mit einem Verankerungsteil zwischen die Öffnungsränder der Gehäuseschalen derart eingreift, dass die im Überlappungsbereich wirkende Klemmkraft die Haltekraft für die Verankerung des Verankerungsteils der Membran an den Öffnungsrändern der Gehäuseschalen bildet. Somit steht die im Überlappungsbereich wirkende Klemmkraft gleichzeitig als Haltekraft für die Verankerung der Membran zur Verfügung, was zu einer besonders signifikanten Vereinfachung der Bauweise führt.In a particularly advantageous manner, the movable separating element may be formed by a membrane whose peripheral edge engages in the overlapping region with an anchoring part between the opening edges of the housing shells so that the clamping force acting in the overlapping region forms the holding force for anchoring the anchoring part of the membrane to the opening edges of the housing shells , Thus, the clamping force acting in the overlapping area is simultaneously available as a holding force for the anchoring of the membrane, which leads to a particularly significant simplification of the construction.

Wenn hierbei die Anordnung so getroffen ist, dass sich die Öffnungsränder der Gehäuseschalen im Bereich der halben Gehäuselänge überlappen, dann steht für die Auslenkung der Membran in vorteilhafter Weise beidseits jeweils etwa der gleiche Freiraum im Speichergehäuse zur Verfügung.If in this case the arrangement is made such that the opening edges of the housing shells overlap in the region of half the housing length, then for the deflection of the membrane is advantageously on both sides each about the same space in the storage housing available.

Das Verankerungsteil am Umfangsrand der Membran kann vorzugsweise durch einen verdickten Randwulst der Membran gebildet sein, der insofern eine Art Dichtring an der Verankerungsstelle bildet.The anchoring part at the peripheral edge of the membrane can preferably be formed by a thickened edge bead of the membrane, which thus forms a kind of sealing ring at the anchoring point.

Das Hohlprofil bildet bevorzugt einen radial nach innen und einen im Abstand davon radial nach außen verlaufenden Schenkel, zwischen denen der Randwulst der Membran aufnehmbar ist, der an seiner Außenseite an der Innenseite des überlappenden Öffnungsrandes der anderen Gehäuseschale anliegt.The hollow profile preferably forms a radially inwardly and at a distance thereof radially outwardly extending legs, between which the edge bead of the membrane can be accommodated, on its outer side at the Inside the overlapping opening edge of the other housing shell rests.

Bei besonders bevorzugten Ausführungsbeispielen sind die Gehäuseschalen aus einer Aluminiumlegierung gebildet, wodurch sich trotz hoher Belastbarkeit ein besonders geringes Baugewicht ergibt.In particularly preferred embodiments, the housing shells are formed from an aluminum alloy, resulting in a particularly low weight despite high load capacity.

Vorzugsweise sind die Anschlüsse der Gehäuseschalen durch zur Längsachse koaxiale, angeformte Anschlusskörper gebildet, an die sich die Wand der betreffenden Gehäuseschale mit gegenüber der Dicke der Anschlusskörper verringerter Wandstärke anschließt. Besonders gute Festigkeitseigenschaften ergeben sich, wenn die Umwicklung im Bereich des Überganges zwischen Anschlusskörper und verringerter Wandstärke der Gehäuseschale eine Verdickung bildet. Dadurch wirkt die Umwicklung auch als Verstärkung des betreffenden Anschlusskörpers gegen im Betrieb an ihm wirkende Lastkräfte oder Schwingungen.Preferably, the terminals of the housing shells are formed by coaxial to the longitudinal axis, integrally formed connection body to which the wall of the respective housing shell with respect to the thickness of the connecting body of reduced wall thickness connects. Particularly good strength properties result when the wrapping forms a thickening in the region of the transition between connection body and reduced wall thickness of the housing shell. As a result, the wrapping also acts as a reinforcement of the relevant connection body against acting during operation on him load forces or vibrations.

Die Umwicklung kann aus einem Material gebildet sein, das Kohlenstoff-, Kevlar®-, Glas-, Bor-, Al2O3-Fasern oder ein Gemisch hieraus enthält.The wrapping may be formed of a material containing carbon, Kevlar ® -, glass, boron, Al 2 O 3 fibers or a mixture containing thereof.

Nachstehend ist die Erfindung anhand von in der Zeichnung dargestellten Ausführungsbeispielen im Einzelnen erläutert. Es zeigen:

Fig. 1
eine gegenüber einer praktischen Ausführungsform etwa um den Faktor 1,4 vergrößert gezeichnete Seitenansicht eines Ausführungsbeispieles des erfindungsgemäßen Hydrospei- chers;
Fig. 2
einen schematisch leicht vereinfacht gezeichneten Längs- schnitt des Ausführungsbeispieles von Fig. 1 und
Fig. 3
eine teilweise aufgeschnitten gezeichnete, etwa im gleichen Maßstab wie Fig. 1 und 2 gezeichnete Seitenansicht eines zweiten Ausführungsbeispieles des Hydrospeichers.
The invention with reference to embodiments shown in the drawings will be explained in detail. Show it:
Fig. 1
an enlarged compared to a practical embodiment, about a factor of 1.4 drawn side view of an embodiment of the hydraulic accumulator according to the invention;
Fig. 2
a schematically slightly simplified drawn longitudinal section of the embodiment of Fig. 1 and
Fig. 3
a partially cut drawn, on about the same scale as Fig. 1 and 2 drawn side view of a second embodiment of the hydraulic accumulator.

In der Zeichnung ist ein annähernd birnenförmiges zu einer Längsachse 3 rotationssymmetrisches Speichergehäuse als Ganzes mit 1 bezeichnet. Dieses weist, zur Achse 3 konzentrisch angeordnet, einen Anschlusskörper 5 und einen Anschlusskörper 7 auf, wobei der Anschlusskörper 5 einen Eingang 9 zur Befüllung der daran angrenzenden Gasseite 11 mit einem Arbeitsgas, vorzugsweise N2, aufweist, während der Anschlusskörper 7 einen Fluideinlass 13 als Verbindung mit einer Fluidseite 15 bildet. Mit jedem Anschlusskörper 5 und 7 einstückig aus einer Aluminiumlegierung geformt, bilden diese metallischen Gehäuseteile jeweils eine zur Achse 3 rotationssymmetrische, dünnwandige Schale, wobei die in der Zeichnung oben liegende Schale mit 17 und die untenliegende Schale mit 19 bezeichnet sind. In dem beim vorliegenden Beispiel auf mittlerer Länge gelegenen Überlappungsbereich 21 überlappen sich die Öffnungsränder 23 und 25 der Schalen 17 bzw. 19. Eine verstärkende Umwicklung 27 aus einem Faserverbundmaterial, worauf unten näher eingegangen wird, erstreckt sich über die gesamte Außenseite des Speichergehäuses 1 vom Übergangsbereich 29, wo der Anschlusskörper 5 in den dünnwandigen Abschnitt der Schale 17 übergeht, bis zum Übergangsbereich 31 am anderen Anschlusskörper 7.In the drawing, an approximately pear-shaped to a longitudinal axis 3 rotationally symmetrical storage housing is designated as a whole with 1. This has, arranged concentrically to the axis 3, a connection body 5 and a connection body 7, wherein the connection body 5 an inlet 9 for filling the adjoining gas side 11 with a working gas, preferably N 2 , while the connection body 7 has a fluid inlet 13 as Connection with a fluid side 15 forms. With each connector body 5 and 7 integrally molded from an aluminum alloy, these metallic housing parts each form a rotationally symmetrical to the axis 3, thin-walled shell, wherein the top in the drawing shell 17 and the underlying shell are designated 19. In the mid-length overlapping area 21 in the present example, the opening edges 23 and 25 of the shells overlap 17 and 19. A reinforcing wrap 27 made of a fiber composite material, which will be discussed in more detail below, extends over the entire outside of the storage housing 1 from the transition region 29, where the connection body 5 merges into the thin-walled portion of the shell 17, to the transition region 31 on other connection body 7.

Der Überlappungsbereich 21 der Schalen 17 und 19 ist so gestaltet, dass im Übergangsbereich 21 eine aus elastomerem Material gebildete Membran 33 mit ihrem Umfangsrand sowohl mechanisch am Speichergehäuse 1 festgelegt ist als auch eine Abdichtung zwischen Gasseite 11 und Fluidseite 15 bildet. Die Membran 33 weist diesbezüglich einen umfänglichen Randwulst 35 auf, der zwischen dem Öffnungsrand 25 der am Überlappungsbereich 21 außenliegenden Schale 19 und dem Öffnungsrand 23 der innenliegenden Schale 17 eingespannt ist. Während der Öffnungsrand 25 der unteren Schale 19 glattflächig endet, bildet der Öffnungsrand 23 der oberen Schale 17 ein radial nach innen eingezogenes Hohlprofil näherungsweise C-förmiger Gestalt, mit einem radial nach innen verlaufenden Schenkel 37 und einem von diesem einen axialen Abstand aufweisenden, radial nach außen strebenden Schenkel 39, die zwischen sich den Randwulst 35 der Membran 33 übergreifen, dessen Außenseite am glattflächigen Öffnungsrand 25 der unteren Schale 19 anliegt.The overlapping region 21 of the shells 17 and 19 is designed so that in the transition region 21, a membrane 33 formed of elastomeric material is both mechanically fixed to the storage housing 1 with its peripheral edge and forms a seal between the gas side 11 and the fluid side 15. The membrane 33 has in this regard a peripheral edge bead 35, which is clamped between the opening edge 25 of the outer region 21 on the overlapping region 21 and the opening edge 23 of the inner shell 17. While the opening edge 25 of the lower shell 19 ends smoothly, the opening edge 23 of the upper shell 17 forms a radially inwardly drawn hollow profile approximately C-shaped configuration, with a radially inwardly extending leg 37 and an axial distance from this, radially to outside striving leg 39, which overlap between the edge bead 35 of the membrane 33, the outside of the smooth-surface opening edge 25 of the lower shell 19 abuts.

Diese Gestaltung des Überlappungsbereiches 21 resultiert nicht nur in einer mechanisch sicheren und fluiddichten Einspannung der Membran 33 an deren verdicktem Randwulst 35, sondern führt auch zu einer Klemmung der einander überlappenden Endränder 23, 25 der Schalen 17 bzw. 19. Die obere Schale 17 bildet am Übergang zum Hohlprofil eine Stufe 41 zur Bildung einer radial eingezogenen Ringfläche, an der der glattflächige Öffnungsrand 25 der unteren Schale 19 so anliegt, dass der Übergang der beiden Schalen 17 und 19 am Überlappungsbereich 21 außenseitig absatzlos erfolgt, so dass die verstärkende Umwicklung 27 an ihrer Außenseite eine auch im Überlappungsbereich 21 glattflächige, absatzlose Kontur bildet. Die Stufe 41 bildet zudem eine Sicherung der Schalen 17 und 19 gegen eine gegeneinander gerichtete Axialbewegung aufgrund der durch die Umwicklung 27 erzeugten, an den Schalen 17, 19 wirkenden Abstützkraft.This configuration of the overlapping region 21 not only results in a mechanically secure and fluid-tight clamping of the membrane 33 at its thickened bead 35, but also leads to a clamping of the overlapping end edges 23, 25 of the shells 17 and 19. The upper shell 17 forms on Transition to the hollow profile, a step 41 for forming a radially retracted annular surface on which the smooth-surfaced opening edge 25 of the lower shell 19 is applied so that the transition of the two shells 17 and 19 on the overlap region 21 on the outside is without offset, so that the reinforcing wrap 27 at her Outside one also in the overlap region 21 smooth-surfaced, choppy contour forms. The step 41 also forms a backup of the shells 17 and 19 against a mutually directed axial movement due to the generated by the wrapping 27, acting on the shells 17, 19 supporting force.

Andererseits bewirkt im Speichergehäuse 1 herrschender Innendruck gegenüber dem durch die verstärkende Umhüllung 27 gebildeten Gegenlager eine Anpresskraft der im Überlappungsbereich 21 aneinanderliegenden Bauelemente, wodurch sich durch den Betriebsdruck eine Verstärkung der Verankerung der im Überlappungsbereich 21 aneinanderliegenden Bauelemente , einschließlich der Erhöhung der Abdichtwirkung, ergibt.On the other hand, in the accumulator housing 1 prevailing internal pressure relative to the abutment formed by the reinforcing sheath 27 a contact force of the abutting in the overlap region 21 components, resulting in an increase in the anchoring of the abutting in the overlap region 21 components, including increasing the Abdichtwirkung results by the operating pressure.

Bei einer aus einem Faserverbundwerkstoff gebildeten Umwicklung 27, die in an sich bekannter Weise gestaltet sein kann, ergibt sich daher in Verbindung mit aus einem Aluminiumwerkstoff gebildeten Schalen 17, 19 eine sehr hohe Druckfestigkeit und Betriebssicherheit bei einfachster Bauweise und insbesondere bei einem Mindestmaß an Baugewicht. Die verstärkende Umwicklung 27 kann aus einer Faserverstärkung, wie Kohlenstoff-, Aramid-, Glas-, Bor-, ALO3-Fasern oder Gemischen hieraus gebildet sein. Vorzugsweise sind diese Faserstoffe in einer Grundmatrix aus Duromeren, beispielsweise Epoxid- oder Phenolharzen, oder in Thermoplasten eingebettet.In a formed from a fiber composite wrap 27, which may be designed in a conventional manner, therefore, results in conjunction with shells formed from an aluminum material 17, 19 a very high pressure resistance and reliability in the simplest design and in particular at a minimum in construction weight. The reinforcing wrap 27 may be formed from a fiber reinforcement such as carbon, aramid, glass, boron, ALO 3 fibers or mixtures thereof. Preferably, these fibers are embedded in a base matrix of thermosets, such as epoxy or phenolic resins, or in thermoplastics.

Das in Fig. 3 gezeigte Ausführungsbeispiel unterscheidet sich vom zuerst beschriebenen Beispiel grundsätzlich lediglich insofern, als an den Übergangsbereichen 29, 31 zwischen den Anschlusskörpern 5 und 7 und dem sich daran anschließenden dünnwandigen Bereich der Schalen 17, 19, wobei in Fig. 3 lediglich der Übergangsbereich 29 an der Schale 17 gezeigt ist, die Umwicklung 27 jeweils einen Verdickungsbereich 45 bildet. Dieser Verdickungsbereich schmiegt sich an eine sich in Axialrichtung erstreckende, zylindrische Außenfläche 47 des jeweiligen Anschlusskörpers 5, 7 so an, dass die Umwicklung 27 einen den Anschlusskörper 5, 7 umgebenden Verstärkungsring bildet, der den jeweiligen Anschlusskörper 5, 7 gegenüber dem dünnwandigen Schalenteil abstützt und somit eine Verstärkung der Anschlusskörper 5 und 7 gegenüber dem übrigen Speichergehäuse 1 bildet, wodurch mechanische, statische oder dynamische, an den Anschlusskörpern 5, 7 wirkende Kräfte in die verstärkende Umwicklung 27 eingeleitet werden, wodurch sich eine besonders hohe Betriebssicherheit bei starken Belastungen ergibt, wie sie beispielsweise bei Wettbewerbsfahrzeugen im Rennbetrieb auftreten können. Bei der Ausführungsform nach der Fig.2 wurde die Wicklung insoweit optimiert, als entlang des Gehäuseumfanges eine im wesentlichen konstante Dicke beibehalten wird. Bei der Ausführungsform nach der Fig.3 ist die Wicklung von der Breite oder Dicke her gesehen unterschiedlich gewählt, insbesondere nimmt die Dicke der Wicklung in Richtung des oberen Anschlusses zu. Dergestalt besteht aber auch die Möglichkeit, an Stellen hoher Beanspruchung diese durch eine verstärkt aufgebrachte Wicklung zu kompensieren.This in Fig. 3 shown embodiment differs from the example first described basically only insofar as at the transition regions 29, 31 between the connecting bodies 5 and 7 and the adjoining thin-walled portion of the shells 17, 19, wherein in Fig. 3 only the transition region 29 is shown on the shell 17, the wrapping 27 each forms a thickening region 45. This thickening region conforms to an axially extending, cylindrical outer surface 47 of the respective connection body 5, 7 in such a way that the winding 27 surrounds a connection body 5, 7 Reinforcing ring forms, which supports the respective connection body 5, 7 relative to the thin-walled shell part and thus forms a reinforcement of the connection body 5 and 7 relative to the rest of the storage housing 1, whereby mechanical, static or dynamic, acting on the connection bodies 5, 7 forces in the reinforcing wrapping 27 are introduced, resulting in a particularly high level of operational reliability under heavy loads, as they can occur, for example, in competition vehicles in racing. In the embodiment of the Fig.2 the winding has been optimized insofar as a substantially constant thickness is maintained along the circumference of the housing. In the embodiment of the Figure 3 If the winding is chosen differently from the width or thickness, in particular the thickness of the winding increases in the direction of the upper terminal. In such a way, however, it is also possible to compensate for these at places of high stress by an increasingly applied winding.

Claims (9)

  1. A hydraulic accumulator,
    - comprising at least two housing shells (17, 19) in the form of rotational bodies with respect to the longitudinal axis (3) of the accumulator housing (1), and
    - comprising at least one separating element (33) that separates inner working chambers (11, 15) from one another, preferably in a medium-sealed manner, within the accumulator housing (1) formed by means of the housing shells (17, 19),
    - in order to form the accumulator housing (1) the housing shells (17, 19) resting against one another with their free front sides, and
    - the individual housing shells (17, 19) being connected to one another in a pressure-sealed manner by means of a fibre winding (27) applied from the outside or at least one applied fibre clutch,
    - characterised in that the opening edges (23, 25) of the housing shells (17, 19) facing one another overlap one another such that the supporting force effective in the overlap region (21) and generated by the winding (27) formed from a fibre composite material and the compressive force acting against the latter and generated upon the basis of the internal pressure in the accumulator housing (1) form a clamping force in the overlap region (21) as a holding force for the reciprocal anchoring of the opening edges (23, 25) of the housing shells (17, 19),
    - that the opening edge (23) of the housing shell (17) which lies radially to the inside in the overlap region (21) forms an approximately C-shaped, radially inwardly drawn in hollow profile for holding the at least one separating element (33), and
    - that the opening edge (25) of the housing shell (19) lying radially outwardly in the overlap region (21) lies against an annular surface in order to form a ledge-free cross-over of the outer surfaces of both housing shells (17, 19), said annular surface being formed by a step (41) that is provided on the opening edge (23) of the other housing shell (17) at the cross-over to the hollow profile.
  2. The hydraulic accumulator according to Claim 1, characterised in that the moveable separating element is formed by a membrane (33) the peripheral edge of which engages in the overlap region (21) with an anchoring part (35) between the opening edges (23, 25) of the housing shells (17, 19) such that the clamping force acting in the overlap region (21) forms the holding force for the anchoring of the anchoring part (35) of the membrane (33) on the opening edges (23, 25) of the housing shells (17, 19).
  3. The hydraulic accumulator according to Claim 1 or 2, characterised in that the opening edges (23, 25) of the housing shells (17, 19) overlap in the region of half of the housing length.
  4. The hydraulic accumulator according to Claim 2 or 3, characterised in that the anchoring part of the membrane (33) is formed by a thickened edge bulge (35) on the peripheral edge of the membrane (33).
  5. The hydraulic accumulator according to Claim 4, characterised in that the hollow profile forms a radially inwardly extending arm (37) and a radially outwardly extending arm (39) a distance away between which the edge bulge (35) of the membrane (33) can be held and which on its outer side lies against the inner side of the overlapping opening edge (25) of the other housing shell (19).
  6. The hydraulic accumulator according to any of the preceding claims, characterised in that the housing shells (17, 19) are formed from an aluminium alloy.
  7. The hydraulic accumulator according to any of the preceding claims, characterised in that the connections on the housing shells (17, 19) are formed by connection bodies (5, 7) coaxial to the longitudinal axis to which the wall of the respective housing shell (17, 19) is connected with reduced wall strength over the thickness of the connection bodies (5, 7).
  8. The hydraulic accumulator according to Claim 7, characterised in that the winding (27) forms a thickening (45) in the region (29, 31) of the cross-over between the connection body (5, 7) and a reduced wall thickness of the housing shells (17, 19).
  9. The hydraulic accumulator according to any of the preceding claims, characterised in that the winding (27) is formed from a material that contains carbon, Kevlar®, glass, boron, AL2O3 fibres or a mixture of the latter.
EP09015615A 2008-12-23 2009-12-17 Hydraulic accumulator Active EP2202412B1 (en)

Applications Claiming Priority (1)

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DE102008062837A DE102008062837A1 (en) 2008-12-23 2008-12-23 hydraulic accumulator

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EP2202412B1 true EP2202412B1 (en) 2011-10-26

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US9074685B2 (en) * 2010-02-26 2015-07-07 GM Global Technology Operations LLC Extruded tube welded vessel liner with injection molded end caps
DE102010050113B4 (en) 2010-10-29 2012-06-21 Mt Aerospace Ag Containers for receiving, storing and dispensing gaseous, liquid and solid media and their use
US9751689B2 (en) * 2013-09-24 2017-09-05 Pentair Residential Filtration, Llc Pressure vessel system and method
EP3904698A1 (en) * 2020-04-30 2021-11-03 Steelhead Composites, LLC Lightweight composite overwrapped accumulators

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US2371632A (en) * 1943-01-01 1945-03-20 Ideal Roller & Mfg Company Accumulator
GB948675A (en) * 1961-10-25 1964-02-05 Eaton Axles Ltd Improvements in or relating to hydraulic pressure accumulators
DE1198148B (en) * 1963-09-20 1965-08-05 Langen & Co Hydraulic pressure accumulator
DE2159293C3 (en) * 1971-11-30 1981-10-22 Gesellschaft für Hydraulik-Zubehör mbH, 6603 Sulzbach Hydropneumatic pressure vessel
DE2754606C2 (en) * 1977-12-08 1983-11-24 Integral Hydraulik & Co, 4000 Düsseldorf Hydropneumatic pressure accumulator
US4595037A (en) * 1984-12-14 1986-06-17 Essef Industries, Inc. Split tank closure and diaphragm assembly
DE20102209U1 (en) * 2001-02-07 2002-06-13 Sachsenring Automobiltechnik AG, 08058 Zwickau Pressure tanks, especially gas-tight plastic tanks
WO2003031860A1 (en) * 2001-10-12 2003-04-17 Polymer & Steel Technologies Holding Company, L.L.C. Composite pressure vessel assembly and method
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US7943884B2 (en) * 2005-03-02 2011-05-17 Toyota Jidosha Kabushiki Kaisha Gas container and method of producing the same
DE102006004120A1 (en) 2006-01-25 2007-07-26 Hydac Technology Gmbh Hydraulic accumulator, has coaxially abutting plastics casings, with poppet valve for controlling supply and extraction of medium
DE102006004121A1 (en) 2006-01-25 2007-07-26 Hydac Technology Gmbh Pressure tank for holding a liquid/gaseous fluid medium has a second plastic jacket encasing a first plastic jacket both attached to each other in a coaxial structure

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DE102008062837A1 (en) 2010-07-01
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