EP1808605B1 - Method for manufacturing piston-type accumulators - Google Patents

Method for manufacturing piston-type accumulators Download PDF

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Publication number
EP1808605B1
EP1808605B1 EP07007946A EP07007946A EP1808605B1 EP 1808605 B1 EP1808605 B1 EP 1808605B1 EP 07007946 A EP07007946 A EP 07007946A EP 07007946 A EP07007946 A EP 07007946A EP 1808605 B1 EP1808605 B1 EP 1808605B1
Authority
EP
European Patent Office
Prior art keywords
cover part
longitudinal edge
accumulator housing
housing
stop
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.)
Expired - Lifetime
Application number
EP07007946A
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German (de)
French (fr)
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EP1808605A1 (en
Inventor
Herbert Baltes
Walter Dorr
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
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Hydac Technology GmbH
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Publication date
Application filed by Hydac Technology GmbH filed Critical Hydac Technology GmbH
Publication of EP1808605A1 publication Critical patent/EP1808605A1/en
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Publication of EP1808605B1 publication Critical patent/EP1808605B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F15B1/24—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with rigid separating means, e.g. pistons
    • 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
    • F15B2201/31—Accumulator separating means having rigid separating means, e.g. pistons
    • F15B2201/312—Sealings therefor, e.g. piston rings
    • 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
    • F15B2201/4155—Gas 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
    • F15B2201/60—Assembling or methods for making accumulators
    • F15B2201/605—Assembling or methods for making housings therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49394—Accumulator making
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y10T29/49915—Overedge assembling of seated part
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y10T29/49915—Overedge assembling of seated part
    • Y10T29/49917—Overedge assembling of seated part by necking in cup or tube wall
    • Y10T29/49918—At cup or tube end

Definitions

  • the invention relates to a method for producing piston accumulators according to the feature configuration of the preamble of claim 1.
  • Piston accumulator as exemplified in the DE 2 238 211 A are shown in the broadest sense belong to the so-called hydraulic accumulators, which serve, inter alia, to hold certain volumes of pressurized fluid (hydraulic medium) of a hydraulic system and return them to the system if necessary. Since the hydraulic medium is under pressure, the hydraulic accumulators are treated like pressure vessels and must be designed for the maximum operating pressure, taking into account the acceptance standards of various installation countries. In most hydro plants today hydropneumatic (gas-loaded) memory are used with separating element, wherein the piston accumulators as a separating element serves a piston which separates a liquid space as a working space of a gas space as another working space within the storage housing of the piston accumulator. Nitrogen is regularly used as working gas and the gas-tight piston largely allows a decoupling of gas space to liquid space.
  • piston accumulator receives liquid and the gas is compressed. With decreasing pressure, the compressed gas expands, displacing the stored pressure fluid back into the hydraulic circuit.
  • the essential components of a piston accumulator are therefore as an accumulator housing an outer cylinder tube, the piston as a separating element with its sealing system and the front-side cap, which at the same time include a liquid and gas connection as cover parts.
  • the memory housing regularly two functions, namely once to stockpile the internal pressure and to ensure the other hand, the leadership of the piston within the storage enclosure.
  • the front side of the interior of the storage enclosure relative to the environment final lid parts are provided on the outer peripheral side with an external thread in a corresponding internal thread along the free longitudinal edge of the storage enclosure via a specifiable distance can be screwed.
  • the preparation of the pertinent threaded connection is time consuming, which increases the cost of manufacturing the piston accumulator accordingly.
  • safety measures must be taken to secure the inserted cover part in its position in the storage housing.
  • the invention has the object to further improve the known production method for piston accumulator to the effect that with little manufacturing effort a functionally reliable and secure connection of a cover part in the storage enclosure a piston accumulator is guaranteed and that damage to the cover part can be avoided.
  • This object is achieved by a method having the features of claim 1 in its entirety.
  • the longitudinal edge is reduced compared to the other memory housing in the wall thickness, that the transition point between these different wall thickness forms the stop for the cover part within the storage enclosure, and that the free longitudinal edge along its free end flush or is guided with a supernatant on the overhead second side of the lid part, a kind of clamping seat is achieved at the respectively associated free end of the storage enclosure for the cover part, wherein the Dekkelteil is clamped at least over the free longitudinal edge of the storage housing after its feed movement to the lid part, said it is sufficient if a part of the free longitudinal edge of the pertinent press fit.
  • the stop provided on the inside of the storage housing makes it possible for the delivery movement of the free longitudinal edge of the storage housing to fix the cover part against this stop. Additionally or alternatively, however, it is also possible to simply insert the cover part at the free end of the storage housing and then trigger the Zustellterrorism for the free longitudinal edge of the storage enclosure, which in dergestalt with the known solutions, for example, after DE 42 05 199 C2 not possible.
  • the Zustellterrorism can take place against the top cover, if the cover part is held in a pertinent position; but it would also be conceivable to carry out a free feed movement for the longitudinal edge, and then then in the ready state, the cover part on the guided in the storage chamber piston against the free To proceed along the longitudinal edge, which then makes such a clamp here.
  • the lid part is inserted with its one lower side against the stop inside the storage housing or that the stop for the lid part is provided with a slope against which the lid part is based in a stepped paragraph.
  • a forming tool is provided which provided with Zustellschrägen the longitudinal edge of the storage housing on the cover part such that this is determined in the manner of said clamping fit in the storage enclosure.
  • the method according to the invention take in a common feed movement to the storage housing two forming tools on opposite sides before the fixing process for the respective end cover part by acting on the respective free longitudinal edge of the storage enclosure. It has proven to be very advantageous for the generation of high locking forces to deliver both free ends of the cylindrical storage enclosure alike, said acting at one end of the storage enclosure forming tool can safely support the forces from the other side during the forming process with the other forming tool be introduced into the storage enclosure.
  • the in Fig.1 shown, counting to the prior art piston accumulator has as a storage housing 10, an outer cylinder tube in which as Separating a piston 12 with its outer peripheral sealing system 14 is guided longitudinally movable.
  • the piston 12 separates within the storage housing 10, two working spaces 16,18 from each other, wherein the one working chamber 16 receiving a working gas, in particular in the form of nitrogen, and the other second working space 18 forms the so-called. Liquid space for the piston accumulator.
  • the displacement position of the piston 12 and consequently the volume proportions of gas and fluid in the work spaces 16 and 18 vary.
  • a cover part 20, 22 is arranged with a gas connection 24 for replenishing the nitrogen working gas and with a fluid port 26 for connecting the piston accumulator to a not-shown hydro overall system.
  • the two cover parts 20,22 are each provided with an external thread 28 which is engageable with an internal thread 30 which is arranged to extend along the free longitudinal edge 32 and opens outwards into the open.
  • the respective cover part 20, 22 is provided with a seal 34 for sealing the interior of the storage housing 10 from the surroundings.
  • the attachment of the threaded sections 28,30 is associated with a certain manufacturing effort, which can be costly and expensive to manufacture the known piston accumulator.
  • an anti-twist device for the respective cover part 20, 22 is necessary in order to ensure its positional fixation within the storage housing 10.
  • a possible anti-rotation for the respective Dekkelteil 20,22 may consist in that along the threads 28,30 provides a conventional adhesive assurance or the cover part is held with a conventional retaining hole (with and without thread) in position.
  • the method according to the invention is characterized, inter alia, by the fact that a cover part, here the cover part 20, is inserted with its one lower side 36 against a stop 38 in the form of an annular surface in the interior of the storage housing 10, wherein on the opposite side 40 of the cover part 20 this is determined over the free longitudinal edge 32 of the storage enclosure 10, for which purpose the longitudinal edge 32 undergoes a feed movement to the cover part 20, which will be explained in more detail below.
  • a forming tool 42 which is provided with at least one feed bevel 44, which sets the longitudinal edge 32 on the lid member 20 that this in the manner of a clamping fit in the storage housing 10 between the stop 38 and the Longitudinal edge 32 is fixed.
  • the upper side 40 of the cover part 20 is provided with a contact surface 46, which is arranged conically to the longitudinal axis 48 of the storage housing 10 extending.
  • the inclination of the pertinent contact surface 46 corresponds to the inclination of the feed bevel 44 of the forming tool 42; but there are also other obvious tendencies or
  • the upper free end of the storage housing with its upper longitudinal edge 32 has a contour according to one of the representations of the 3 to 6 , In this case, the longitudinal edge 32 is reduced in relation to the other storage housing 10 in the wall thickness, wherein the transition point between the various wall thicknesses forms the stop 38 for the cover part 20. Furthermore, the longitudinal edge 32 is preferably provided on its side facing the cover part 20 and outwardly oriented with a conical insertion bevel 50. The pertinent insertion bevel 50 facilitates the insertion of the cover part 20 in the free upper end of the storage housing 10, which will be explained in more detail below.
  • the free longitudinal edge 32 which in particular the representation according to the 4 and 5 shows, on the outer circumference side and to the free end of the storage enclosure 10 out towards be provided with a sliding bevel 52, which makes it easier for the longitudinal edge 32, from its cylindrical shape according to the representations of the 3 to 6 to pass into a notified inclined position, wherein the sliding bevel 52 then slides along the feed slope 44 of the forming tool 42, provided that it is increasingly placed in the feed direction on the storage housing 10. If the feed movement is completed with the forming tool 42, the longitudinal edge 32 is on the cover part 20 along its contact surface 46 in the manner of a Festgeschräge formed inclined and holds the lid member 20 against the stop 38 in the interior of the storage enclosure 10 fixed.
  • the free longitudinal edge 32 along its free end with a supernatant on the overhead second side 40 of the cover part 20 is guided.
  • the forming tool 42 is moved away from the storage housing 10 again and then takes, for example, his in the Fig.2 shown upper position.
  • the forming process for the respective longitudinal edge 32 of the storage housing 10 is cold; but it is also a hot forming conceivable with appropriate heating of the storage housing material and preferably the forming tool 42 itself.
  • the storage housing 10 with its longitudinal edge 32 is a conventional, good moldable steel material used.
  • the height of the cover part 20 is adapted in each case to the predetermined by the operation of the storage conditions.
  • the cover part 20 is at least twice as large as the length of the longitudinal edge 32 between its free end and a deflection point 54, from which the longitudinal edge 32 is placed on the lid top.
  • a particularly preferred embodiment (not shown) of the method according to the invention is in a common feed movement two forming tools 42 on opposite sides of the storage housing 10 of the fixing process for the respective end-side cover part 20,22 made simultaneously and together with substantially the same forming forces by acting on the respective free longitudinal edge 32 of the storage enclosure 10.
  • the respective opposite forming tool can simultaneously absorb the forces of the other forming tool during forming, as they occur during the forming process.
  • the pertinent embodiment can be saved on elaborate supporting devices on the respective opposite sides, where the forming tool 42 does not act. Also, such a harmonic introduction of force into the storage housing 10 occurs without the occurrence of damaging force peaks.
  • the 3 and 4 can show by means of a Aufsetzwerkmaschinees 56, as shown in the Figure 4 the free longitudinal edge 32 of the storage housing 10, the respective cover part 20,22 are introduced into the storage housing 10 to the stop 38 in the form of the annular surface.
  • the Aufsetzwerkmaschine 56 has a Zu glassschräge 58, along the outer peripheral side, the cover part 20,22 can slide off.
  • the Aufsetzwerkmaschine 56 has a receiving space 60, in which the upper end of the storage enclosure 10 is receivable, so that the Zu manufacturedschräge 58 flush with the upper edge of the longitudinal edge 32 and the rest continuously in the receiving area 62 for the actual cover part 20th , 22 in the memory housing 10 passes.
  • the memory housing 10 along its upper longitudinal edge 32 on the inner peripheral side and outwardly widening with the insertion beveled 50, resulting in a kind of shortened slip edge over which the respective cover part 20,22 so also introduce and then set later.
  • the pertinent variant can be chosen if the lid seal 34 proves to be robust and should not be too vulnerable to damage.
  • the same reference numerals are used for the same components and the modified embodiment procedurally described only insofar as it differs significantly from the above-indicated method.
  • the upper lid part 20 has been held by the free longitudinal edge 32 of the storage housing 10 such that the free longitudinal edge 32 is flush along its free end with the upper second side 40 of the lid part 20.
  • the stopper 38 for the cover part 20 is in the embodiment of the Figure 7 provided with a slope against which the cover part 20 is based in a stepped paragraph.
  • the ring seal 34 is again received on the outer peripheral side, wherein due to the indicated gradation of storage housing 10 and cover part 20, the possibility exists to edit the storage housing 10 for a clean contact with the sealing ring 34 at this point according to very fine and the inside the memory housing 10 to leave essentially unprocessed, provided that the delivery area for the free longitudinal edges 32 of the storage enclosure 10 is addressed.

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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)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Actuator (AREA)

Abstract

The production process produces a piston-type accumulator with a housing (10) and a separate piston. The endfaces of the housing are each sealed by a cover part (20), fixed on one side (40) via the free longitudinal edge (32) of the housing, which is displaced towards the cover part to fit it in a positive secure connection.

Description

Die Erfindung betrifft ein Verfahren zum Herstellen von Kolbenspeichern gemäß der Merkmalsausgestaltung des Oberbegriffes des Patentanspruches 1.The invention relates to a method for producing piston accumulators according to the feature configuration of the preamble of claim 1.

Kolbenspeicher wie sie beispielhaft in der DE 2 238 211 A aufgezeigt sind, gehören im weitesten Sinne zu den sog. Hydrospeichern, die unter anderem dazu dienen, bestimmte Volumen unter Druck stehender Flüssigkeit (Hydraulikmedium) einer Hydroanlage aufzunehmen und diese bei Bedarf an die Anlage zurückzugeben. Da sich das Hydraulikmedium unter Druck befindet, werden die Hydrospeicher wie Druckbehälter behandelt und müssen für den maximalen Betriebsüberdruck unter Berücksichtigung der Abnahmestandards von diversen Aufstellungsländern ausgelegt sein. In den meisten Hydroanlagen werden heutzutage hydropneumatische (gasbeaufschlagte) Speicher mit Trennelement eingesetzt, wobei bei den Kolbenspeichern als Trennelement ein Kolben dient, der innerhalb des Speichergehäuses des Kolbenspeichers einen Flüssigkeitsraum als Arbeitsraum von einem Gasraum als weiteren Arbeitsraum trennt. Als Arbeitsgas kommt regelmäßig Stickstoff zum Einsatz und der gasdichte Kolben erlaubt weitgehend eine Entkopplung von Gasraum zu Flüssigkeitsraum.Piston accumulator as exemplified in the DE 2 238 211 A are shown in the broadest sense belong to the so-called hydraulic accumulators, which serve, inter alia, to hold certain volumes of pressurized fluid (hydraulic medium) of a hydraulic system and return them to the system if necessary. Since the hydraulic medium is under pressure, the hydraulic accumulators are treated like pressure vessels and must be designed for the maximum operating pressure, taking into account the acceptance standards of various installation countries. In most hydro plants today hydropneumatic (gas-loaded) memory are used with separating element, wherein the piston accumulators as a separating element serves a piston which separates a liquid space as a working space of a gas space as another working space within the storage housing of the piston accumulator. Nitrogen is regularly used as working gas and the gas-tight piston largely allows a decoupling of gas space to liquid space.

Der Flüssigkeitsteil steht mit dem Hydrokreislauf in Verbindung, so dass beim Anstieg des Druckes der Kolbenspeicher Flüssigkeit aufnimmt und das Gas dabei komprimiert wird. Bei sinkendem Druck dehnt sich das verdichtete Gas aus und verdrängt dabei die gespeicherte Druckflüssigkeit zurück in den Hydrokreislauf. Ein Vorteil von Kolbenspeichern ist, dass sie in jeder Lage "arbeiten" können, wobei jedoch eine senkrechte Anordnung mit der Gasseite nach oben vorzuziehen ist, damit ein Absetzen von Schmutzpartikeln aus der Flüssigkeit auf den Kolbendichtungen vermieden wird.The liquid part communicates with the hydraulic circuit, so that when the pressure rises, the piston accumulator receives liquid and the gas is compressed. With decreasing pressure, the compressed gas expands, displacing the stored pressure fluid back into the hydraulic circuit. One advantage of piston accumulators is that they can "work" in any position, but a vertical arrangement with the gas side upwards is preferable in order to avoid settling of dirt particles from the liquid on the piston seals.

Die wesentlichen Bestandteile eines Kolbenspeichers sind mithin als Speichergehäuse ein äußeres Zylinderrohr, der Kolben als Trennelement mit seinem Dichtungssystem sowie die stirnseitigen Verschlußdeckel, die als Deckelteile gleichzeitig auch einen Flüssigkeits- und Gasanschluß beinhalten. Dem Speichergehäuse kommen regelmäßig zwei Funktionen zu, nämlich einmal den inneren Druck zu bevorraten und zum anderen die Führung des Kolbens innerhalb des Speichergehäuses zu gewährleisten. Bei einer bekannten Lösung nach der JP 03 092679 A (SHOWA MFG Co. Ltd.) 17. April 1991 (1991-04-17) sind die stirnseitig das Innere des Speichergehäuses gegenüber der Umgebung abschließenden Deckelteile außenumfangsseitig mit einem Außengewinde versehen, das in ein korrespondierendes Innengewinde entlang des freien Längsrandes des Speichergehäuses über eine vorgebbare Wegstrecke einschraubbar ist. Das Herstellen der dahingehenden Gewindeverbindung ist zeitaufwendig, was die Herstellkosten für den Kolbenspeicher entsprechend verteuert. Des weiteren sind Sicherungsmaßnahmen vorzusehen, um das eingebrachte Deckelteil in seiner Lage im Speichergehäuse zu sichern.The essential components of a piston accumulator are therefore as an accumulator housing an outer cylinder tube, the piston as a separating element with its sealing system and the front-side cap, which at the same time include a liquid and gas connection as cover parts. The memory housing regularly two functions, namely once to stockpile the internal pressure and to ensure the other hand, the leadership of the piston within the storage enclosure. In a known solution according to the JP 03 092679 A (SHOWA MFG Co. Ltd.) April 17, 1991 (1991-04-17), the front side of the interior of the storage enclosure relative to the environment final lid parts are provided on the outer peripheral side with an external thread in a corresponding internal thread along the free longitudinal edge of the storage enclosure via a specifiable distance can be screwed. The preparation of the pertinent threaded connection is time consuming, which increases the cost of manufacturing the piston accumulator accordingly. Furthermore, safety measures must be taken to secure the inserted cover part in its position in the storage housing.

Durch die DE 42 05 199 A (SHOWA SEISAKUSHO GYODA KK) 10. September 1992 (1992-09-10) und Patent Abstracts of Japan Bd. 1999, Nr. 13, 30. November 1999 (1999-11-30) &; JP 11 230102 A (KAYABA IND Co. Ltd.), 27. August 1999 (1999-08-27) sind gattungsgemäße Verfahren zum Herstellen von Kolbenspeichern bekannt, mit einem Speichergehäuse und einem im Speichergehäuse längsverfahrbaren Trennkolben, der innerhalb des Speichergehäuses zwei Arbeitsräume voneinander trennt, das endseitig von jeweils einem Deckelteil, gegebenenfalls in einteiliger Gehäuseausführung, verschlossen wird, wobei an der einen Seite zumindest eines Deckelteils dieses über den freien Längsrand des Speichergehäuses festgelegt wird, der zu diesem Zweck eine Zustellbewegung auf das Deckelteil erfährt, wobei dieses Deckelteil nach außen hin das Speichergehäuse abschließt und mit seiner der einen Seite gegenüberliegenden Seite gegen einen Anschlag im Inneren des Speichergehäuses in dieses eingesetzt wird und/oder dass das jeweilige Deckelteil durch die Klemmkraft des zugestellten freien Längsrandes in seiner Endlage gehalten wird. Durch die DE 42 05 199 A ist darüber hinaus bekannt, den freien Längsrand gegenüber dem sonstigen Speichergehäuse in der Wandstärke gleich zu belassen oder gar entsprechend zu verstärken, wobei diese Übergangsstelle zwischen den gleichen Wandstärken im freien Endbereich des Speichergehäuses den Anschlag für einen absatzartigen Vorsprung am Außenumfang des Deckelteils innerhalb des Speichergehäuses bildet, der insoweit in Richtung der Umgebung orientiert nach außen vorspringt.
Die bekannten Lösungen sind kompliziert in der Herstellung und beinhalten an der Stelle des nach außen freiliegenden Deckelabschlusses die Gefahr von Beschädigungen am Deckelteil.By the DE 42 05 199 A (SHOWA SEISAKUSHO GYODA KK) September 10, 1992 (1992-09-10) and Patent Abstracts of Japan Vol. 1999, No. 13, November 30, 1999 (1999-11-30) &; JP 11 230102 A (KAYABA IND Co. Ltd.), August 27, 1999 (1999-08-27) generic methods for producing piston accumulators are known, with a storage housing and a storage housing longitudinally movable separating piston, which separates two working spaces within the storage housing from each other, the end is closed by a respective cover part, optionally in one-piece housing design, wherein on one side of at least one cover part this is fixed over the free longitudinal edge of the storage housing, which experiences a Zustellbewegung on the cover part for this purpose, said cover part to the outside of the storage enclosure closes and is used with its one side opposite side against a stop in the interior of the storage enclosure in this and / or that the respective cover part is held by the clamping force of the delivered free longitudinal edge in its end position. By the DE 42 05 199 A is also known to leave the free longitudinal edge opposite the other storage enclosure in the wall thickness equal or even amplify accordingly, said transition point between the same wall thicknesses in the free end region of the storage enclosure forms the stop for a paragraph-like projection on the outer periphery of the cover part within the storage enclosure , which so far oriented towards the environment outwardly protrudes.
The known solutions are complicated to manufacture and involve at the location of the lid exposed to the outside the risk of damage to the lid part.

Ausgehend von diesem bekannten Stand der Technik stellt sich die Erfindung die Aufgabe die bekannten Herstellverfahren für Kolbenspeicher dahingehend weiter zu verbessern, dass mit geringem Herstellaufwand eine funktionssichere und lagesichere Verbindung eines Deckelteils im Speichergehäuse eines Kolbenspeichers gewährleistet ist und dass Beschädigungen am Deckelteil vermeidbar sind. Eine dahingehende Aufgabe löst ein Verfahren mit den Merkmalen des Patentanspruches 1 in seiner Gesamtheit.Based on this known state of the art, the invention has the object to further improve the known production method for piston accumulator to the effect that with little manufacturing effort a functionally reliable and secure connection of a cover part in the storage enclosure a piston accumulator is guaranteed and that damage to the cover part can be avoided. This object is achieved by a method having the features of claim 1 in its entirety.

Dadurch, dass gemäß dem kennzeichnenden Teil des Patentanspruches 1 der Längsrand gegenüber dem sonstigen Speichergehäuse in der Wandstärke reduziert wird, dass die Übergangsstelle zwischen diesen verschiedenen Wandstärken den Anschlag für das Deckelteil innerhalb des Speichergehäuses bildet, und dass der freie Längsrand entlang seinem freien Ende bündig oder mit einem Überstand über die obenliegende zweite Seite des Deckelteils geführt wird, wird für das Deckelteil eine Art Klemmsitz am jeweils zugeordneten freien Ende des Speichergehäuses erreicht, bei dem das Dekkelteil zumindest über den freien Längsrand des Speichergehäuses nach dessen Zustellbewegung auf das Deckelteil festgeklemmt wird, wobei es genügt, wenn ein Teil des freien Längsrandes den dahingehenden Klemmsitz verwirktlicht.Characterized in that according to the characterizing part of claim 1, the longitudinal edge is reduced compared to the other memory housing in the wall thickness, that the transition point between these different wall thickness forms the stop for the cover part within the storage enclosure, and that the free longitudinal edge along its free end flush or is guided with a supernatant on the overhead second side of the lid part, a kind of clamping seat is achieved at the respectively associated free end of the storage enclosure for the cover part, wherein the Dekkelteil is clamped at least over the free longitudinal edge of the storage housing after its feed movement to the lid part, said it is sufficient if a part of the free longitudinal edge of the pertinent press fit.

Der an der Innenseite des Speichergehäuses vorgesehene Anschlag ermöglicht bei der Zustellbewegung des freien Längsrandes des Speichergehäuses, dass das Deckelteil gegen diesen Anschlag festgelegt wird. Zusätzlich oder alternativ besteht aber auch die Möglichkeit, das Deckelteil einfach am freien Ende des Speichergehäuses einzusetzen und dann die Zustellbewegung für den freien Längsrand des Speichergehäuses auszulösen, was dergestalt mit den bekannten Lösungen beispielsweise nach der DE 42 05 199 C2 nicht möglich ist. Die Zustellbewegung kann dabei gegen die Deckeloberseite erfolgen, sofern das Deckelteil in einer dahingehenden Lage gehalten wird; es wäre aber auch denkbar, eine freie Zustellbewegung für den Längsrand auszuführen, um dann anschließend im betriebsbereiten Zustand das Deckelteil über den im Speichergehäuse geführten Kolben gegen den freien Längsrand zu verfahren, der dann dergestalt die Klemmung hier vornimmt. Vorzugsweise ist dabei vorgesehen, dass das Deckelteil mit seiner einen unteren Seite gegen den Anschlag ins Innere des Speichergehäuses eingesetzt wird oder dass der Anschlag für das Deckelteil mit einer Schräge versehen ist, gegen die sich in einem gestuften Absatz das Deckelteil anlehnt.The stop provided on the inside of the storage housing makes it possible for the delivery movement of the free longitudinal edge of the storage housing to fix the cover part against this stop. Additionally or alternatively, however, it is also possible to simply insert the cover part at the free end of the storage housing and then trigger the Zustellbewegung for the free longitudinal edge of the storage enclosure, which in dergestalt with the known solutions, for example, after DE 42 05 199 C2 not possible. The Zustellbewegung can take place against the top cover, if the cover part is held in a pertinent position; but it would also be conceivable to carry out a free feed movement for the longitudinal edge, and then then in the ready state, the cover part on the guided in the storage chamber piston against the free To proceed along the longitudinal edge, which then makes such a clamp here. Preferably, it is provided that the lid part is inserted with its one lower side against the stop inside the storage housing or that the stop for the lid part is provided with a slope against which the lid part is based in a stepped paragraph.

Aufgrund des gegenüber dem Deckelteil überstehenden Längsrandes ist eine sichere Position des Deckelteils im Speichergehäuse erreicht und das Deckelteil ist vor schädigenden Krafteinleitungen geschützt.Due to the opposite to the lid part projecting longitudinal edge a secure position of the lid part is achieved in the storage housing and the cover part is protected from damaging force application.

Vorzugsweise ist dabei weiter vorgesehen, dass für die Zustellbewegung des Längsrandes des Speichergehäuses ein Umformwerkzeug vorgesehen wird, das mit Zustellschrägen versehen den Längsrand des Speichergehäuses auf das Deckelteil derart legt, dass dieses in der Art des genannten Klemmsitzes im Speichergehäuse festgelegt wird.Preferably, it is further provided that for the feed movement of the longitudinal edge of the storage housing, a forming tool is provided which provided with Zustellschrägen the longitudinal edge of the storage housing on the cover part such that this is determined in the manner of said clamping fit in the storage enclosure.

Bei einer besonders vorteilhaften Ausgestaltung des erfindungsgemäßen Verfahrens nehmen in einer gemeinsamen Zustellbewegung auf das Speichergehäuse zwei Umformwerkzeuge an gegenüberliegenden Seiten den Festlegevorgang für das jeweilige endseitige Deckelteil vor, indem diese auf den jeweils freien Längsrand des Speichergehäuses einwirken. Es hat sich für das Erzeugen hoher Festlegekräfte als sehr vorteilhaft erwiesen, beide freien Enden des zylindrischen Speichergehäuses gleichermaßen zuzustellen, wobei das an einem Ende des Speichergehäuses wirkende Umformwerkzeug sicher die Kräfte mit abstützen kann, die von der anderen Seite her beim Umformvorgang mit dem anderen Umformwerkzeug in das Speichergehäuse eingeleitet werden.In a particularly advantageous embodiment of the method according to the invention take in a common feed movement to the storage housing two forming tools on opposite sides before the fixing process for the respective end cover part by acting on the respective free longitudinal edge of the storage enclosure. It has proven to be very advantageous for the generation of high locking forces to deliver both free ends of the cylindrical storage enclosure alike, said acting at one end of the storage enclosure forming tool can safely support the forces from the other side during the forming process with the other forming tool be introduced into the storage enclosure.

Weitere vorteilhafte Ausführungsformen sind Gegenstand der sonstigen Unteransprüche.Further advantageous embodiments are the subject of the other dependent claims.

Im folgenden wird das erfindungsgemäße Verfahren anhand der Zeichnung näher erläutert. Dabei zeigen in prinzipieller und nicht maßstäblicher Darstellung die

Fig.1
einen Längsschnitt durch einen Kolbenspeicher nach dem Stand der Technik;
Fig.2
im Längsschnitt den oberen Teil einer ersten Ausführungsform eines Kolbenspeichergehäuses mit darüberliegendem Umformwerkzeug;
Fig.3 und 4
im Längsschnitt das Aufsetzen eines Montagewerkzeuges auf das freie Ende des Speichergehäuses zwecks Festlegen eines Deckelteils;
Fig.5 und 6
im Längsschnitt den oberen Bereich des Speichergehäuses in zwei verschiedenen Varianten mit innen liegenden Einführschrägen zum Einführen des Deckelteils;
Fig.7
ebenfalls im Längsschnitt den oberen Teil einer zweiten Ausführungsform eines Kolbenspeichergehäuses mit geändertem Deckelteil.
In the following the method according to the invention will be explained in more detail with reference to the drawing. This show in principle and not to scale representation of the
Fig.1
a longitudinal section through a piston accumulator according to the prior art;
Fig.2
in longitudinal section the upper part of a first embodiment of a piston accumulator housing with overlying forming tool;
3 and 4
in longitudinal section, the placement of an assembly tool on the free end of the storage enclosure for the purpose of setting a cover part;
Fig.5 and 6
in longitudinal section the upper region of the storage housing in two different variants with internal insertion bevels for insertion of the cover part;
Figure 7
also in longitudinal section the upper part of a second embodiment of a piston accumulator housing with a modified cover part.

Der in Fig.1 gezeigte, zum Stand der Technik zählende Kolbenspeicher weist als Speichergehäuse 10 ein äußeres Zylinderrohr auf, in dem als Trennelement ein Kolben 12 mit seinem außenumfangsseitigen Dichtsystem 14 längsverfahrbar geführt ist. Der Kolben 12 trennt innerhalb des Speichergehäuses 10 zwei Arbeitsräume 16,18 voneinander ab, wobei der eine Arbeitsraum 16 der Aufnahme eines Arbeitsgases, insbesondere in Form von Stickstoff, dient und der weitere zweite Arbeitsraum 18 bildet den sog. Flüssigkeitsraum für den Kolbenspeicher aus. In Abhängigkeit der Betriebssituation des Speichers variieren die Verfahrstellung des Kolbens 12 und mithin die Volumenanteile an Gas und Fluid in den Arbeitsräumen 16 bzw. 18. Am stirnseitigen Ende des Speichergehäuses 10 ist jeweils ein Deckelteil 20,22 angeordnet mit einem Gasanschluß 24 zum Nachfüllen des Stickstoffarbeitsgases und mit einem Flüssigkeitsanschluß 26 zum Anschließen des Kolbenspeichers an ein nicht näher dargestelltes Hydro-Gesamtanlagensystem.The in Fig.1 shown, counting to the prior art piston accumulator has as a storage housing 10, an outer cylinder tube in which as Separating a piston 12 with its outer peripheral sealing system 14 is guided longitudinally movable. The piston 12 separates within the storage housing 10, two working spaces 16,18 from each other, wherein the one working chamber 16 receiving a working gas, in particular in the form of nitrogen, and the other second working space 18 forms the so-called. Liquid space for the piston accumulator. Depending on the operating situation of the memory, the displacement position of the piston 12 and consequently the volume proportions of gas and fluid in the work spaces 16 and 18 vary. At the front end of the storage housing 10, a cover part 20, 22 is arranged with a gas connection 24 for replenishing the nitrogen working gas and with a fluid port 26 for connecting the piston accumulator to a not-shown hydro overall system.

Die beiden Deckelteile 20,22 sind jeweils mit einem Außengewinde 28 versehen, das in Eingriff bringbar ist mit einem Innengewinde 30, das entlang dem freien Längsrand 32 verlaufend angeordnet ist und nach außen hin ins Freie mündet. Außenumfangsseitig ist das jeweilige Deckelteil 20,22 mit einer Dichtung 34 versehen zum Abdichten des Inneren des Speichergehäuses 10 von der Umgebung. Das Anbringen der Gewindestrecken 28,30 ist mit einem gewissen Herstellaufwand verbunden, was die bekannten Kolbenspeicher aufwendig und teuer in der Herstellung werden läßt. Auch ist zusätzlich eine Verdrehsicherung für das jeweilige Deckelteil 20,22 notwendig, um seine Lagefixierung innerhalb des Speichergehäuses 10 sicherzustellen. Eine mögliche Verdrehsicherung für das jeweilige Dekkelteil 20,22 kann darin bestehen, dass man entlang der Gewinde 28,30 eine übliche Klebstoffsicherung vorsieht oder der Deckelteil wird mit einer üblichen Haltebohrung (mit und ohne Gewinde) in seiner Lage gehalten.The two cover parts 20,22 are each provided with an external thread 28 which is engageable with an internal thread 30 which is arranged to extend along the free longitudinal edge 32 and opens outwards into the open. On the outer circumference, the respective cover part 20, 22 is provided with a seal 34 for sealing the interior of the storage housing 10 from the surroundings. The attachment of the threaded sections 28,30 is associated with a certain manufacturing effort, which can be costly and expensive to manufacture the known piston accumulator. In addition, an anti-twist device for the respective cover part 20, 22 is necessary in order to ensure its positional fixation within the storage housing 10. A possible anti-rotation for the respective Dekkelteil 20,22 may consist in that along the threads 28,30 provides a conventional adhesive assurance or the cover part is held with a conventional retaining hole (with and without thread) in position.

Ausgehend von dieser bekannten Lösung wird nunmehr anhand der Fig.2ff das erfindungsgemäße Verfahren näher vorgestellt, das in kostengünstiger Weise eine funktionssichere Verbindung von Deckelteil mit dem zugehörigen Speichergehäuse 10 erlaubt. Der einfacheren Darstellung wegen wurde demgemäß in der Fig.2 nur das obere Ende des Speichergehäuses 10 dargestellt zusammen mit dem oberen Deckelteil 20. Sofern im folgenden dieselben Bauteile angesprochen sind wie bei der bekannten Ausführungsform nach der Fig.1, werden die dahingehenden Bauteile mit denselben Bezugszeichen wie in der Fig.1 wiedergegeben bezeichnet.Based on this known solution, the method according to the invention will now be described in more detail with reference to Fig.2ff, which allows a functionally reliable connection of the cover part with the associated memory housing 10 in a cost effective manner. For the sake of simplicity, it has accordingly been incorporated in the Fig.2 only the upper end of the storage case 10 shown together with the upper cover part 20. Unless the following components are addressed as in the known embodiment according to the Fig.1 , the corresponding components with the same reference numerals as in Fig.1 referred to.

Das erfindungsgemäße Verfahren ist unter anderem dadurch charakterisiert, dass ein Deckelteil, hier das Deckelteil 20, mit seiner einen unteren Seite 36 gegen einen Anschlag 38 in Form einer Ringfläche im Inneren des Speichergehäuses 10 in dieses eingesetzt wird, wobei an der gegenüberliegenden Seite 40 des Deckelteils 20 dieses über den freien Längsrand 32 des Speichergehäuses 10 festgelegt wird, wobei zu diesem Zweck der Längsrand 32 eine Zustellbewegung auf das Deckelteil 20 erfährt, was im folgenden noch näher erläutert werden wird.The method according to the invention is characterized, inter alia, by the fact that a cover part, here the cover part 20, is inserted with its one lower side 36 against a stop 38 in the form of an annular surface in the interior of the storage housing 10, wherein on the opposite side 40 of the cover part 20 this is determined over the free longitudinal edge 32 of the storage enclosure 10, for which purpose the longitudinal edge 32 undergoes a feed movement to the cover part 20, which will be explained in more detail below.

Für die Zustellung des Längsrandes 32 des Speichergehäuses 10 dient ein Umformwerkzeug 42, das mit mindestens einer Zustellschräge 44 versehen ist, welche den Längsrand 32 derart auf das Deckelteil 20 legt, dass dieses in der Art eines Klemmsitzes im Speichergehäuse 10 zwischen dem Anschlag 38 und dem Längsrand 32 festgelegt ist. Zum Erstellen des dahingehenden Klemmsitzes ist die obere Seite 40 des Deckelteils 20 mit einer Anlagefläche 46 versehen, die konisch zur Längsachse 48 des Speichergehäuses 10 verlaufend angeordnet ist. Die Neigung der dahingehenden Anlagefläche 46 entspricht der Neigung der Zustellschräge 44 des Umformwerkzeuges 42; es sind hier aber auch andere sinnfällige Neigungen bzw.For the delivery of the longitudinal edge 32 of the storage enclosure 10 is a forming tool 42 which is provided with at least one feed bevel 44, which sets the longitudinal edge 32 on the lid member 20 that this in the manner of a clamping fit in the storage housing 10 between the stop 38 and the Longitudinal edge 32 is fixed. To create the pertinent clamping seat, the upper side 40 of the cover part 20 is provided with a contact surface 46, which is arranged conically to the longitudinal axis 48 of the storage housing 10 extending. The inclination of the pertinent contact surface 46 corresponds to the inclination of the feed bevel 44 of the forming tool 42; but there are also other obvious tendencies or

Schrägen denkbar. Wie die Darstellung nach der Fig.2 zeigt, ist die Zustellrichtung für das Umformwerkzeug 42 die Längsachse 48 des Speichergehäuses 10 bzw. des gesamten Kolbenspeichers.Sloping conceivable. As the presentation after the Fig.2 shows, the feed direction for the forming tool 42, the longitudinal axis 48 of the storage housing 10 and the entire piston accumulator.

Der besseren Darstellung wegen wurde in der Fig.2 das Trennelement in Form des Kolbens 12 weggelassen ebenso wie der in Fig.1 dargestellte Gasanschluß 24, der auch hier integraler Bestandteil des oberen Deckelteils 20 ist. Bevor die Klemmverbindung über das Umformwerkzeug 42 hergestellt wird, weist das obere freie Ende des Speichergehäuses mit seinem oberen Längsrand 32 eine Kontur auf gemäß einer der Darstellungen nach den Fig.3 bis 6. Dabei ist der Längsrand 32 gegenüber dem sonstigen Speichergehäuse 10 in der Wandstärke reduziert, wobei die Übergangsstelle zwischen den verschiedenen Wandstärken den Anschlag 38 für das Deckelteil 20 bildet. Des weiteren wird der Längsrand 32 vorzugsweise auf seiner dem Deckelteil 20 zugewandten Seite und nach außen hin orientiert mit einer konischen Einführschräge 50 versehen. Die dahingehende Einführschräge 50 erleichtert das Einführen des Deckelteils 20 in das freie obere Ende des Speichergehäuses 10, was im folgenden noch näher erläutert werden wird.The better representation because of was in the Fig.2 omitted the separator in the form of the piston 12 as well as in Fig.1 illustrated gas port 24, which is also an integral part of the upper lid part 20 here. Before the clamping connection is made via the forming tool 42, the upper free end of the storage housing with its upper longitudinal edge 32 has a contour according to one of the representations of the 3 to 6 , In this case, the longitudinal edge 32 is reduced in relation to the other storage housing 10 in the wall thickness, wherein the transition point between the various wall thicknesses forms the stop 38 for the cover part 20. Furthermore, the longitudinal edge 32 is preferably provided on its side facing the cover part 20 and outwardly oriented with a conical insertion bevel 50. The pertinent insertion bevel 50 facilitates the insertion of the cover part 20 in the free upper end of the storage housing 10, which will be explained in more detail below.

Des weiteren kann der freie Längsrand 32, was insbesondere die Darstellung nach den Fig.4 und 5 zeigt, außenumfangsseitig und zum freien Ende des Speichergehäuses 10 hin orientiert mit einer Gleitschräge 52 versehen sein, was es dem Längsrand 32 erleichtert, aus seiner zylindrischen Form gemäß den Darstellungen nach den Fig.3 bis 6 in eine zugestellte geneigte Stellung überzugehen, wobei die Gleitschräge 52 dann entlang der Zustellschräge 44 des Umformwerkzeuges 42 abgleitet, sofern dieses in Zustellrichtung auf das Speichergehäuse 10 zusehends aufgesetzt wird. Ist die Zustellbewegung mit dem Umformwerkzeug 42 abgeschlossen, ist der Längsrand 32 auf das Deckelteil 20 entlang seiner Anlagefläche 46 in der Art einer Festlegeschräge ausgebildet geneigt und hält dergestalt das Deckelteil 20 gegen den Anschlag 38 im Inneren des Speichergehäuses 10 fest.Furthermore, the free longitudinal edge 32, which in particular the representation according to the 4 and 5 shows, on the outer circumference side and to the free end of the storage enclosure 10 out towards be provided with a sliding bevel 52, which makes it easier for the longitudinal edge 32, from its cylindrical shape according to the representations of the 3 to 6 to pass into a notified inclined position, wherein the sliding bevel 52 then slides along the feed slope 44 of the forming tool 42, provided that it is increasingly placed in the feed direction on the storage housing 10. If the feed movement is completed with the forming tool 42, the longitudinal edge 32 is on the cover part 20 along its contact surface 46 in the manner of a Festgeschräge formed inclined and holds the lid member 20 against the stop 38 in the interior of the storage enclosure 10 fixed.

Um die sichere Position des Deckelteils 20 im Speichergehäuse 10 nicht zu gefährden und um auch das Deckelteil 20 vor schädigenden Krafteinleitungen zu schützen, ist, wie dies die Darstellung nach der Fig.2 zeigt, der freie Längsrand 32 entlang seinem freien Ende mit einem Überstand über die oben liegende zweite Seite 40 des Deckelteils 20 geführt. Nach Festlegen der dahingehenden Klemmverbindung wird das Umformwerkzeug 42 vom Speichergehäuse 10 wieder wegbewegt und nimmt dann beispielsweise seine in der Fig.2 gezeigte obere Stellung ein. Vorzugsweise erfolgt der Umformvorgang für den jeweiligen Längsrand 32 des Speichergehäuses 10 kalt; es ist aber auch ein Warmumformen denkbar mit entsprechender Erwärmung des Speichergehäusematerials sowie vorzugsweise des Umformwerkzeuges 42 selbst. Als Werkstoff für das Speichergehäuse 10 mit seinem Längsrand 32 kommt ein üblicher, gut formbarer Stahlwerkstoff zum Einsatz. Um die Klemmkräfte optimal in das Deckelteil 20 einzuleiten und um auch randseitig für das Deckelteil 20 eine gute Abstützung im Speichergehäuse 10 zu gewährleisten, ist vorgesehen, dass die Höhe des Deckelteils 20 jeweils an die durch den Betrieb des Speichers vorgegebenen Einsatzbedingungen angepaßt ist. Im gezeigten Fall ist das Deckelteil 20 mindestens doppelt so groß ist wie die Länge des Längsrandes 32 zwischen seinem freien Ende und einer Umlenkstelle 54, ab der der Längsrand 32 auf die Deckeloberseite aufgelegt ist.In order not to jeopardize the secure position of the cover part 20 in the storage housing 10 and also to protect the cover part 20 from damaging force discharges, as shown in the illustration Fig.2 shows, the free longitudinal edge 32 along its free end with a supernatant on the overhead second side 40 of the cover part 20 is guided. After determining the pertinent clamp connection, the forming tool 42 is moved away from the storage housing 10 again and then takes, for example, his in the Fig.2 shown upper position. Preferably, the forming process for the respective longitudinal edge 32 of the storage housing 10 is cold; but it is also a hot forming conceivable with appropriate heating of the storage housing material and preferably the forming tool 42 itself. As a material for the storage housing 10 with its longitudinal edge 32 is a conventional, good moldable steel material used. In order to optimally initiate the clamping forces in the cover part 20 and also to ensure a good support in the storage housing 10 at the edge for the cover part 20, it is provided that the height of the cover part 20 is adapted in each case to the predetermined by the operation of the storage conditions. In the case shown, the cover part 20 is at least twice as large as the length of the longitudinal edge 32 between its free end and a deflection point 54, from which the longitudinal edge 32 is placed on the lid top.

Bei einer besonders bevorzugten Ausgestaltung (nicht dargestellt) des erfindungsgemäßen Verfahrens wird in einer gemeinsamen Zustellbewegung zweier Umformwerkzeuge 42 an gegenüberliegenden Seiten des Speichergehäuses 10 der Festlegevorgang für das jeweilige endseitige Deckelteil 20,22 zeitgleich und gemeinsam mit im wesentlichen gleichen Umformkräften durch Einwirkung auf den jeweils freien Längsrand 32 des Speichergehäuses 10 vorgenommen. Es hat sich gezeigt, dass bei der dahingehenden Umformlösung das jeweils gegenüberliegende Umformwerkzeug gleichzeitig beim Umformen die Kräfte des anderen Umformwerkzeuges mit aufnehmen kann, wie sie während des Umformvorganges auftreten. Bei der dahingehenden Ausgestaltung kann auf aufwendige Abstützvorrichtungen auf den jeweils gegenüberliegenden Seiten, wo das Umformwerkzeug 42 nicht einwirkt, eingespart werden. Auch kommt es dergestalt zu einer harmonischen Krafteinleitung in das Speichergehäuse 10 ohne Auftreten von schädigenden Kraftspitzen.In a particularly preferred embodiment (not shown) of the method according to the invention is in a common feed movement two forming tools 42 on opposite sides of the storage housing 10 of the fixing process for the respective end-side cover part 20,22 made simultaneously and together with substantially the same forming forces by acting on the respective free longitudinal edge 32 of the storage enclosure 10. It has been found that in the pertinent forming solution, the respective opposite forming tool can simultaneously absorb the forces of the other forming tool during forming, as they occur during the forming process. In the pertinent embodiment can be saved on elaborate supporting devices on the respective opposite sides, where the forming tool 42 does not act. Also, such a harmonic introduction of force into the storage housing 10 occurs without the occurrence of damaging force peaks.

Wie die Fig.3 und 4 zeigen, kann mittels eines Aufsetzwerkzeuges 56, das gemäß der Darstellung nach der Fig.4 den freien Längsrand 32 des Speichergehäuses 10 umfaßt, das jeweilige Deckelteil 20,22 in das Speichergehäuse 10 bis zum Anschlag 38 in Form der Ringfläche eingebracht werden. Für den dahingehenden Einführvorgang weist das Aufsetzwerkzeug 56 eine Zuführschräge 58 auf, entlang der außenumfangsseitig das Deckelteil 20,22 abgleiten kann. Durch den Einsatz des Montagewerkzeuges 56 ist erreicht, dass eine mögliche Dichtungsbeschädigung der Dichtung 34 des jeweiligen Deckelteils 20,22 mit Sicherheit vermieden ist. Neben der Zuführschräge 58 weist das Aufsetzwerkzeug 56 einen Aufnahmeraum 60 auf, in den das obere Ende des Speichergehäuses 10 aufnehmbar ist, so dass die Zuführschräge 58 bündig mit der Oberkante des Längsrandes 32 abschließt und im übrigen kontinuierlich in den Aufnahmebereich 62 für das eigentliche Deckelteil 20,22 im Speichergehäuse 10 übergeht.As the 3 and 4 can show by means of a Aufsetzwerkzeuges 56, as shown in the Figure 4 the free longitudinal edge 32 of the storage housing 10, the respective cover part 20,22 are introduced into the storage housing 10 to the stop 38 in the form of the annular surface. For the pertinent insertion process, the Aufsetzwerkzeug 56 has a Zuführschräge 58, along the outer peripheral side, the cover part 20,22 can slide off. Through the use of the assembly tool 56 it is achieved that a possible seal damage of the seal 34 of the respective cover part 20,22 is avoided with certainty. In addition to the Zuführschräge 58, the Aufsetzwerkzeug 56 has a receiving space 60, in which the upper end of the storage enclosure 10 is receivable, so that the Zuführschräge 58 flush with the upper edge of the longitudinal edge 32 and the rest continuously in the receiving area 62 for the actual cover part 20th , 22 in the memory housing 10 passes.

Bei den Ausführungsformen nach den Fig.5 und 6 ist das Speichergehäuse 10 entlang seines oberen Längsrandes 32 innenumfangsseitig und nach außen hin sich erweiternd mit der Einführschräge 50 versehen, was eine Art verkürzte Schlupfkante ergibt, über die sich dergestalt das jeweilige Deckelteil 20,22 gleichfalls einführen und später dann festlegen läßt. Die dahingehende Variante kann gewählt werden, sofern die Deckeldichtung 34 sich als robust erweist und für Beschädigungen nicht allzu anfällig sein sollte.In the embodiments of the Fig.5 and 6 is the memory housing 10 along its upper longitudinal edge 32 on the inner peripheral side and outwardly widening with the insertion beveled 50, resulting in a kind of shortened slip edge over which the respective cover part 20,22 so also introduce and then set later. The pertinent variant can be chosen if the lid seal 34 proves to be robust and should not be too vulnerable to damage.

Für die geänderte Ausführungsform nach der Fig.7 werden für dieselben Bauteile dieselben Bezugszeichen verwendet und die geänderte Ausführungsform verfahrenstechnisch nur noch insofern beschrieben, als sie sich wesentlich von den vorangehend aufgezeigten Verfahren unterscheidet. Bei der gezeigten Ausführungsform wurde das obere Deckelteil 20 von dem freien Längsrand 32 des Speichergehäuses 10 derart gehalten, dass der freie Längsrand 32 entlang seinem freien Ende bündig mit der obenliegenden zweiten Seite 40 des Deckelteils 20 abschließt. Der Anschlag 38 für das Deckelteil 20 ist bei der Ausführungsform nach der Fig.7 mit einer Schräge versehen, gegen die sich in einem gestuften Absatz das Deckelteil 20 anlehnt. In der zurückversetzten abschnittsweisen Stufe 64 ist außenumfangsseitig wiederum die Ringdichtung 34 aufgenommen, wobei aufgrund der aufgezeigten Stufung von Speichergehäuse 10 und Deckelteil 20 die Möglichkeit besteht, das Speichergehäuse 10 für eine saubere Anlage mit dem Dichtring 34 an dieser Stelle entsprechend feinst zu bearbeiten und die Innenseite des Speichergehäuses 10 im wesentlichen unbearbeitet zu lassen, sofern der Zustellbereich für die freien Längsränder 32 des Speichergehäuses 10 angesprochen ist.For the modified embodiment of the Figure 7 the same reference numerals are used for the same components and the modified embodiment procedurally described only insofar as it differs significantly from the above-indicated method. In the embodiment shown, the upper lid part 20 has been held by the free longitudinal edge 32 of the storage housing 10 such that the free longitudinal edge 32 is flush along its free end with the upper second side 40 of the lid part 20. The stopper 38 for the cover part 20 is in the embodiment of the Figure 7 provided with a slope against which the cover part 20 is based in a stepped paragraph. In the recessed section-wise step 64, the ring seal 34 is again received on the outer peripheral side, wherein due to the indicated gradation of storage housing 10 and cover part 20, the possibility exists to edit the storage housing 10 for a clean contact with the sealing ring 34 at this point according to very fine and the inside the memory housing 10 to leave essentially unprocessed, provided that the delivery area for the free longitudinal edges 32 of the storage enclosure 10 is addressed.

Mit der genannten Umformtechnik bezogen auf die freien Längsränder 32 des Speichergehäuses 10 lassen sich mithin Deckelteile 20,22 in den verschiedensten Ausführungen paßgenau und sicher sowie druckdicht in den Speichergehäusen 10 festlegen und auf kostenintensiv anzubringende Schraubverbindungen an dieser Stelle, die zusätzlich noch zu sichern sind, kann vollständig verzichtet werden.With the aforementioned forming technique based on the free longitudinal edges 32 of the storage case 10 can thus cover parts 20,22 set in a variety of versions in register and safe and pressure-tight in the storage enclosures 10 and costly to be attached screw at this point, which are additionally secure, can be completely dispensed with.

Claims (8)

  1. A method for the production of piston-type accumulators comprising an accumulator housing (10) and a separating piston (12) which can be displaced in a longitudinal direction within the accumulator housing (10) and which separates two working spaces (16, 18) within the accumulator housing (10) which is sealed at least at one of its ends by a cover part (20, 22), on the one side (40) of this cover part (20, 22) the latter being fixed via the free longitudinal edge (32) of the accumulator housing (10) which for this purpose is displaced towards the cover part (20, 22) which is inserted into the accumulator housing (10) with its side (36) lying opposite the one side (40) against a stop (38) within said accumulator housing (10) and/or the respective cover part being held by the clamping force of the displaced free longitudinal edge in its end position, characterised in that the wall thickness of the longitudinal edge (32) is reduced in relation to the rest of the accumulator housing (10) such that the transition point between these different wall thicknesses forms the stop (38) for the cover part (20) within the accumulator housing (10) and that the free longitudinal edge (32) is guided along its free end flush with or with a projection over the second side (40) of the cover part (20) positioned at the top.
  2. The method according to Claim 1, characterised in that the cover part (20) is inserted with its one lower side (36) against the stop (38) within the accumulator housing (10) or that the stop (38) for the cover part (20) is provided with a slope against which the cover part (20) leans in a stepped ledge.
  3. The method according to Claim 1 or 2, characterised in that for the displacement movement of the longitudinal edge (32) of the accumulator housing (10) a forming tool (42) is provided which lays the longitudinal edge (32) provided with at least one advancing slope (44) on the cover part (20) such that the latter is fixed in the manner of a force fit within the accumulator housing (10).
  4. The method according to any of Claims 1 to 3, characterised in that the longitudinal edge (32) is provided on its side facing towards the respective cover part (20, 22) and outwardly with a guiding slope (50).
  5. The method according to any of Claims 2 to 4, characterised in that in a common displacement movement two forming tools (42) on opposite sides of the accumulator housing (10) implement the fixing procedure for the respective end side cover part (20, 22) by acting upon the respective free longitudinal edge (32) of the accumulator housing (10).
  6. The method according to any of Claims 1 to 5, characterised in that by means of a fitting tool (56) which includes the free longitudinal edge (32) of the accumulator housing (10), the cover part (20, 22) is introduced into the accumulator housing (10) up to the stop (38) by means of a directing slope (58).
  7. The method according to any of Claims 1 to 6, characterised in that the longitudinal edge (32) is provided on the inner peripheral side with an outwardly extending guiding slope (50) for the cover part (20, 22).
  8. The method according to any of Claims 1 to 7, characterised in that the height of the cover part (20, 22) is chosen to be at least twice as high as the free longitudinal edge (38) of the accumulator housing (10) used to clamp the cover part (20, 22).
EP07007946A 2003-02-01 2004-01-15 Method for manufacturing piston-type accumulators Expired - Lifetime EP1808605B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10303988A DE10303988A1 (en) 2003-02-01 2003-02-01 Method of manufacturing piston accumulators
EP04702305A EP1588056B1 (en) 2003-02-01 2004-01-15 Method for the production of piston-type accumulators

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP04702305A Division EP1588056B1 (en) 2003-02-01 2004-01-15 Method for the production of piston-type accumulators

Publications (2)

Publication Number Publication Date
EP1808605A1 EP1808605A1 (en) 2007-07-18
EP1808605B1 true EP1808605B1 (en) 2009-04-15

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EP04702305A Expired - Lifetime EP1588056B1 (en) 2003-02-01 2004-01-15 Method for the production of piston-type accumulators
EP07007946A Expired - Lifetime EP1808605B1 (en) 2003-02-01 2004-01-15 Method for manufacturing piston-type accumulators

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EP04702305A Expired - Lifetime EP1588056B1 (en) 2003-02-01 2004-01-15 Method for the production of piston-type accumulators

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US (1) US8387253B2 (en)
EP (2) EP1588056B1 (en)
JP (1) JP2006516706A (en)
AT (2) ATE365870T1 (en)
DE (3) DE10303988A1 (en)
WO (1) WO2004067968A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004043352A1 (en) 2004-09-08 2006-03-23 Hydac Technology Gmbh hydraulic accumulator
GB2420380A (en) * 2004-11-18 2006-05-24 Parker Hannifin Plc Twin piston gas filled hydraulic actuator
DE102009021463A1 (en) 2009-05-15 2010-11-18 Hydac Technology Gmbh hydraulic accumulator
DE102015014797A1 (en) * 2015-11-14 2017-05-18 Hydac Technology Gmbh safety device

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US2734531A (en) * 1956-02-14 Hydraulic accumulators
US2748801A (en) * 1953-10-22 1956-06-05 Tommy J Mccuistion Accumulators
US3408731A (en) * 1966-04-25 1968-11-05 Mercier Jean Method of retaining cover member on pressure vessel
US3541833A (en) * 1966-04-25 1970-11-24 Jean Mercier Apparatus for forming pressure vessel ends
DE2238211A1 (en) 1972-08-03 1974-02-14 Haenchen Kg Herbert PRESSURIZED CYLINDRICAL CONTAINER
DE3411592C2 (en) * 1984-03-29 1994-06-30 Hydac Technology Gmbh Hydropneumatic accumulator
US4848448A (en) * 1987-12-28 1989-07-18 Mccord Heat Transfer Corporation Heat exchange assembly
JPH03101U (en) * 1989-05-23 1991-01-07
JPH0392679A (en) 1989-09-05 1991-04-17 Showa Mfg Co Ltd Manufacture of pressure vessel
US5115663A (en) * 1989-11-25 1992-05-26 Honda Giken Kogyo Kabushiki Kaisha Method for forming a crankshaft
JP2531945Y2 (en) * 1991-02-20 1997-04-09 株式会社ショーワ Accumulator structure
US5311910A (en) * 1991-02-20 1994-05-17 Kabushiki Kaisha Showa Seisakusho Cap attachment structure for accumulator
JPH08159102A (en) * 1994-12-05 1996-06-18 Nok Corp Accumulator
JP3712321B2 (en) 1998-02-12 2005-11-02 カヤバ工業株式会社 accumulator
JP2000071134A (en) * 1998-08-27 2000-03-07 Nissan Diesel Motor Co Ltd Piston inserting device in engine assembling work
EP1128073A1 (en) * 2000-02-28 2001-08-29 Serta Method of closing the end which forms the head or rod guide of the barrel of an actuator cylinder
IT1318123B1 (en) * 2000-07-05 2003-07-23 Alfamatic S R L PNEUMATIC, HYDRAULIC AND SIMILAR CYLINDER, AND METHOD FOR CUSTOMIZATION
JP4342091B2 (en) * 2000-08-03 2009-10-14 本田技研工業株式会社 Piston insertion jig
US6460571B1 (en) * 2001-03-13 2002-10-08 Parker-Hannifin Corporation Crimped piston/membrane accumulator
DE10139192A1 (en) * 2001-08-16 2003-03-06 Hydac Technology Gmbh piston accumulators
DE10313241A1 (en) 2003-03-25 2004-10-21 Hydac Technology Gmbh piston accumulators

Also Published As

Publication number Publication date
JP2006516706A (en) 2006-07-06
DE10303988A1 (en) 2004-08-19
ATE428861T1 (en) 2009-05-15
EP1808605A1 (en) 2007-07-18
US20060016074A1 (en) 2006-01-26
DE502004004183D1 (en) 2007-08-09
ATE365870T1 (en) 2007-07-15
EP1588056A1 (en) 2005-10-26
WO2004067968A1 (en) 2004-08-12
EP1588056B1 (en) 2007-06-27
DE502004009375D1 (en) 2009-05-28
US8387253B2 (en) 2013-03-05

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