WO2025201737A1 - Procédé de fabrication d'au moins une partie d'un boîtier d'accumulateur et accumulateur hydraulique - Google Patents

Procédé de fabrication d'au moins une partie d'un boîtier d'accumulateur et accumulateur hydraulique

Info

Publication number
WO2025201737A1
WO2025201737A1 PCT/EP2025/054218 EP2025054218W WO2025201737A1 WO 2025201737 A1 WO2025201737 A1 WO 2025201737A1 EP 2025054218 W EP2025054218 W EP 2025054218W WO 2025201737 A1 WO2025201737 A1 WO 2025201737A1
Authority
WO
WIPO (PCT)
Prior art keywords
accumulator
material accumulation
housing parts
housing part
storage housing
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.)
Pending
Application number
PCT/EP2025/054218
Other languages
German (de)
English (en)
Inventor
Peter Kloft
Julian Adams
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hydac Technology GmbH
Original Assignee
Hydac Technology GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hydac Technology GmbH filed Critical Hydac Technology GmbH
Publication of WO2025201737A1 publication Critical patent/WO2025201737A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/02—Pressure butt welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/002—Resistance welding; Severing by resistance heating specially adapted for particular articles or work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/08—Seam welding not restricted to one of the preceding subgroups
    • B23K11/093—Seam welding not restricted to one of the preceding subgroups for curved planar seams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/14—Projection welding
    • 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
    • F15B1/12—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating means attached at their periphery
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/04—Tubular or hollow articles
    • 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
    • F15B2201/60—Assembling or methods for making accumulators
    • F15B2201/605—Assembling or methods for making housings therefor

Definitions

  • the invention relates to a method for producing at least part of an accumulator housing for a hydraulic accumulator.
  • the invention further relates to a hydraulic accumulator, which is produced in particular according to such a method.
  • Fluidic storage devices in the form of hydraulic accumulators are freely available on the market in a variety of designs. Hydraulic accumulators serve, among other things, to absorb certain volumes of pressurized fluids and return them to the system when needed. Particularly common are hydraulic systems with hydropneumatic accumulators with a separating device designed as a diaphragm. The diaphragm separates, in particular, a fluid chamber as the working chamber from a gas chamber as a further working chamber. However, the diaphragm decouples the gas and fluid chambers.
  • Nitrogen is preferably used as the working gas
  • the fluid chamber for a hydraulic medium is regularly connected to a hydraulic circuit of a hydraulic system, so that when the pressure in the hydraulic circuit increases, the hydraulic accumulator absorbs the hydraulic medium, and the gas is compressed. When the pressure drops, the previously compressed Gas is released and displaces the liquid or hydraulic medium back into the hydraulic circuit.
  • DE 10 2015 01 7 026 A1 discloses a method for producing pressure vessels, such as hydraulic accumulators, and their parts, which are manufactured at least partially using a 3D printing process. This eliminates the need for additional molding equipment such as heated molds. Rather, a reservoir housing for a hydraulic accumulator or parts of such hydraulic accumulators, such as separating elements, can be manufactured in a single piece without the use of molds, which also significantly reduces the manual effort required during production.
  • the overall time required to produce pressure vessels for hydraulic accumulators using a 3D printing process is still quite high, making additive manufacturing processes for large-scale production difficult to implement economically, at least for the time being.
  • DE 10 2015 012 357 A1 discloses a method for producing a hydraulic accumulator, in particular in the form of a diaphragm accumulator, comprising at least two housing parts of an accumulator housing, in which a separating element in the form of a separating membrane separates two media spaces within the accumulator housing.
  • the method is characterized in that, in at least one of the housing parts of the accumulator housing, a connecting part is inserted into the housing opening and welded from the inside of the accumulator, wherein the separating membrane is inserted into the interior of the accumulator housing, and wherein a further housing part is placed or brought into contact with one housing part to form the accumulator housing, the two housing parts being firmly connected to one another along adjacent wall regions on the outer circumference by means of a weld seam.
  • the weld seam is advantageously realized by friction welding, electron beam welding or laser beam welding, preferably without the use of filler materials.
  • the adjacent inside in the area of the weld seam connection is covered by a wall shoulder of a storage housing part and/or a fixing ring for the separating membrane covers the welding point, which is designed to be correspondingly resistant, as shown for example in DE 101 12 976 A1.
  • DE 10 2018 007 280 A1 discloses a hydraulic accumulator, again consisting of two housing parts of the accumulator housing, which can form a different material pairing with other components of the accumulator, such as a separating bellows as a separating element.
  • the housing parts can comprise titanium materials or be made of titanium, whereas the separating bellows is made of a conventional steel material.
  • Such accumulators are characterized by very high strength and low weight, and the connection between the aforementioned components can be produced by cladding, preferably explosive cladding, which is also known in technical terms as explosive welding. This technically very complex joining process thus allows material groupings to be joined together that would otherwise not be easily manufactured using conventional welding processes.
  • Another possibility is to at least partially insert such storage devices or hydraulic accumulators with their two housing parts forming a storage housing and to fold or flange an annular protruding edge at the free end of one storage housing part inwards, resting on parts of the upper side of the other storage housing part near the edge, so that the housing parts are connected to each other in a contacting manner with a defined clamping force in this area. Since the connection of the storage housing- Since the connection between the parts can only be maintained by means of clamping force and high forming forces are therefore necessary to produce the clamped connection, it is not readily suitable for use in large-scale production.
  • the invention is based on the object of providing an alternative manufacturing concept which, while retaining the advantages of the known solutions, ensures a high-strength connection between storage housing parts and is to be further improved towards economical large-scale production.
  • the welding process can be carried out without additional welding material, creating a particularly homogeneous weld joint between the two adjacent storage housing parts.
  • the relatively high contact force when joining or moving one storage housing part together with the other creates a very strong, homogeneous bond between the components, which reliably withstands even greater stresses during subsequent practical operation. This results in a uniform material joining pattern in the area of the weld between the two housing parts.
  • the forming of the weld seam is carried out in such a way that it projects outwards beyond the two adjacent storage housing parts. This ensures that in the area of the weld seam, no inward-facing concave groove may occur, which could otherwise impair the further work steps of pre-treatment and subsequent painting of the storage housing.
  • the annular material accumulation is triangular in cross-section and has an opening angle of 50° to 110°, particularly preferably 70°, at the tip. Due to the above-mentioned angle values, it is ensured that the groove-shaped recess is not too deep, so that an unwanted lateral closure cannot occur during resistance welding. It has been shown that the geometric triangular shape is suitable for the Hump, especially with regard to the material thickness and the material strength, is particularly suitable for ensuring good force introduction as well as optimized recovery for the material accumulation in the direction of the production of the weld nugget between the aforementioned joining partners in the form of the two housing parts or half shells.
  • the groove recessed in the end face of the other storage housing part merges seamlessly into the adjacent wall parts along the associated end face of this storage housing part.
  • the material accumulation preferably merges on the outer and/or inner circumference into a boundary surface which runs transversely to the longitudinal orientation of the material accumulation.
  • additional support is provided via the respective boundary surface, so that an improved weld seam connection is achieved.
  • the free end face of the storage housing part with the groove-shaped recess protrudes beyond the inner circumference of the adjacent storage housing part in the increasingly retracted state, towards the center of the storage housing, which benefits further stiffening and in particular ensures that the weld connection runs towards the inside of the storage housing.
  • the accumulator housing part with the recess has a continuous central opening for at least the introduction of a fluid, in particular in the form of a working gas, and that the The accumulator housing part with the material accumulation has a further through-hole central opening, which serves at least for the introduction of another fluid, in particular in the form of a working fluid. Due to the aforementioned central openings, the hydraulic accumulator according to the invention can be functionally connected to complete hydraulic systems, and the separating element arranged in the hydraulic accumulator separates a gas side from a liquid side in the accumulator housing.
  • Figures 1 to 4 show in longitudinal section and in succession the basic process steps for producing an accumulator housing of a hydraulic accumulator from two accumulator housing parts;
  • Figures 5 and 6 show two completed hydraulic accumulators based on the basic accumulator construction according to Figures 1 to 4 with an inserted dome-shaped separating membrane, which is fixed at the edge to the inside of the accumulator housing via fixing or holding devices.
  • Figures 1 to 4 show the essential process steps for producing at least part of an accumulator housing 10 for a hydraulic accumulator, as shown by way of example in Figures 5 and 6.
  • Figure 1 shows the provision of storage housing parts 12, 14 to be connected to one another, along adjacent end faces 16 and 18, respectively, of which, viewed in the direction of Figure 1, the lower storage housing part 12 has a material accumulation 20 on its free end face.
  • the annular material accumulation 20 is triangular in cross-section and has an opening angle of preferably 70° at its tip; however, other opening angles are also conceivable, for example in the range of 50° to 110°.
  • the material accumulation 20 is preferably an integral component of the remaining shell material for the lower storage housing part 12.
  • the lower storage housing part 12 has, in the usual way, a central opening 22 for the inlet or outlet of a fluid, such as a hydraulic medium.
  • the upper storage housing part 14 is provided concentrically to the lower central opening 22 with a further central opening 24 in the usual way, which serves for the introduction of a working gas, such as nitrogen gas.
  • a recess 26 is introduced into the upper or other end face 18 of the upper storage housing part 14, preferably in a V-groove shape, wherein the free cross-section of the recess 26 is adapted to the geometry of the material tip of the material accumulation 20.
  • this adaptation is selected such that the free opening cross-section for the triangular recess 26 is slightly larger than the angle for the tip of the material accumulation 20 entering the recess 26 in this area.
  • the recess 26 preferably has a free opening angle of preferably 90°, if the free opening angle of the material accumulation 20 at its tip is 70°. Within the tolerance limits, the specified angle values of 70° and 90° can be slightly exceeded or undercut.
  • a centric engagement of the tip of the material accumulation 20 in the associated recess 26 is ensured.
  • the guide mentioned is not absolutely necessary, so that if necessary, the recess 26 can also be omitted, so that the tip of the material accumulation 20 during When the storage housing parts 12 and 14 move together, it encounters a flat contact surface, namely the upper, free end face 18 of the upper storage housing part 14.
  • Figure 2 shows, starting from the basic state according to Figure 1, the two storage housing parts 12, 14 moving towards each other, wherein, as already described, the tip of the material accumulation then enters the V-shaped recess 26, which in this respect forms the centering aid in this area. At the same time, or subsequently, the material accumulation 20 melts by means of a welding process, as indicated in the illustration in Figure 3.
  • the welding method used according to the invention is so-called resistance pressure welding, in particular resistance projection welding.
  • resistance projection welding the lower storage housing part 12 is pressed against the upper storage housing part 14 as the cathode 30 by means of a stamp-shaped anode 28 with a predeterminable contact force.
  • an electrical voltage or current is applied to both the anode 28 and the cathode 30, the material accumulation 20 is melted due to the resulting contact resistance when the storage housing parts 12, 14 are placed against one another, as shown in Figures 2 and 3.
  • Due to the contact force via the anode 28, the material accumulation 20 is reformed until an annular weld nugget 32 is obtained, which creates the actual welded connection 34 as shown in Figure 4 between the two storage housing parts 12, 14 after it has cooled.
  • the annular weld nugget 32 has a central region 36 in the form of a circular ring, which serves to accommodate additional hydraulic accumulator components, which will be explained in more detail below.
  • the anode 28 is not absolutely necessary; rather, the lower accumulator housing part 12 can also exclusively form the anode. Under the influence of force, one 12 can be pressed onto the other accumulator housing part. 14 or vice versa. Furthermore, it is possible to force both storage housing parts 12, 14 towards each other to form the welded joint.
  • the material accumulation 20 forms an isosceles triangle, and during the recovery process, the boundary surfaces 38, 40 remain intact for a relatively long time, as can be seen from Figure 3, which relates to the formation of the weld nugget 32 in the transition area between the two housing parts 12, 14.
  • Figure 3 which relates to the formation of the weld nugget 32 in the transition area between the two housing parts 12, 14.
  • a weld seam or weld joint 34 is simultaneously formed along a connection point 42 between the storage housing parts 12, 14, as shown in Figure 4, as the two storage housing parts 12, 14 are further brought together during projection welding with a predeterminable contact force.
  • the respective weld seam 34 is still essentially lens-shaped and protrudes beyond the outer circumference of the storage housing 10 in this connection area, whereby the respective projection 44 can be removed during further processing, so that a closed outer surface is created for the purpose of applying protective coatings, including a paint finish (not shown).
  • the projection 44 for the weld seam 34 is in any case selected such that it results in a gap-free closure between the Weld seam 34 and the adjacent storage housing part 12, 14.
  • FIG. 5 shows a hydropneumatic pressure accumulator or hydraulic accumulator shortly before completion, i.e., the two accumulator housing parts 12, 14 are not yet welded together.
  • a movable, elastomeric separating element 46 is inserted into the central region 36 of the accumulator. This separating element will later, after the completion of the hydraulic accumulator, separate a first media chamber, in particular gas chamber 48, from a second media chamber, in particular liquid chamber 50, in a media-tight manner.
  • the separating element 46 or the separating membrane is positioned in the conventional manner (DE 101 12 976 AI) by means of a circumferential retaining ring 52 in the lower accumulator housing part 12, as shown.
  • the retaining ring 52 which is designed to be flexible on the upper peripheral part via longitudinal slots, has a protective ring 54 in a corresponding circumferential groove on the outer peripheral side, which helps to prevent unwanted material from entering the inner side of the storage housing 10 during welding, so that not only the separating element 46 is protected, but also the retaining ring 52, which may be constructed from sensitive plastic materials.
  • the separating element 56 has a buttoned closure part 56, which, in the maximum deflection position of the separating element 46, closes the lower central opening 22 for fluid transfer into the interior of the accumulator in this area.
  • a connecting piece 58 Extending from the central opening 22, a connecting piece 58 is located underneath, which is firmly connected to the lower accumulator housing part 12 via an additional welded connection, such as a fillet weld 59.
  • This connecting piece 58 is generally used to establish a connection between fluid- or media-carrying parts of a hydraulic circuit (not shown) and the hydraulic accumulator.
  • the upper accumulator housing part 14 is now also provided with an additional connecting piece 60, which serves to supply a working gas into the hydraulic accumulator for the purpose of creating a gas storage space on the gas side of the hydraulic accumulator, formed by the gas space 48.
  • the additional upper connecting piece 60 is firmly connected to the upper side of the upper accumulator housing part 14 by means of an additional weld seam 62.
  • the production of this additional weld seam 62 is disclosed in the subsequently published DE 10 2022 129 348.3 of the patent holder.
  • a circumferential welding bed 64 is prepared on the outer circumference at the upper end in the region of the transition to the lower accumulator housing part 12, which serves to accommodate the fillet weld 59 yet to be applied, as shown in Figure 5.
  • annular clamping device 66 which in turn holds an edge-shaped stiffener 68 of the separating element 46, is arranged below the horizontal plane with the welded connection 34.
  • the annular separating device 66 preferably consists of a spring-elastic metal material, so that under the spring preload of the clamping device 66, the edge bead 68 of the separating element 46 is fixed in a defined manner against the inside of the lower accumulator housing part 12.
  • This type of fixing of a separating element in a hydraulic accumulator housing 10 is also common and is shown by way of example in DE 10 2015 012 357 A1.
  • the projection welding process for the two half-shells 12, 14 for producing a storage housing 10 achieves a high-strength connection between them, producing a particularly gentle welded connection that can be used on an economically viable scale for large-scale production of hydraulic accumulators.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)

Abstract

1. Procédé 2. L'invention concerne un procédé de production d'au moins une partie d'un boîtier d'accumulateur (10) pour un accumulateur hydraulique, ledit procédé comprenant les étapes de procédé suivantes : - fournir des parties de boîtier d'accumulateur (12, 14) qui doivent être reliées les unes aux autres le long de côtés d'extrémité mutuellement adjacents (16, 18), dont au moins un côté d'extrémité (16) présente une accumulation de matériau (20) ; - rapprocher les parties de boîtier d'accumulateur adjacentes (12, 14) de telle sorte que l'accumulation de matériau (20) entre en contact avec le côté d'extrémité adjacent (18) ; et, simultanément ou à la suite, faire fondre l'accumulation de matériau (20) par l'intermédiaire d'un processus de soudage, et rapprocher davantage les deux parties de boîtier d'accumulateur (12, 14) pendant le processus de soudage avec une force de pression pouvant être prédéfinie ; et, simultanément, former un cordon de soudure s'étendant le long d'un point de liaison (42) entre les parties de boîtier d'accumulateur.
PCT/EP2025/054218 2024-03-27 2025-02-17 Procédé de fabrication d'au moins une partie d'un boîtier d'accumulateur et accumulateur hydraulique Pending WO2025201737A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102024000990.6 2024-03-27
DE102024000990.6A DE102024000990A1 (de) 2024-03-27 2024-03-27 Verfahren

Publications (1)

Publication Number Publication Date
WO2025201737A1 true WO2025201737A1 (fr) 2025-10-02

Family

ID=94687686

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2025/054218 Pending WO2025201737A1 (fr) 2024-03-27 2025-02-17 Procédé de fabrication d'au moins une partie d'un boîtier d'accumulateur et accumulateur hydraulique

Country Status (2)

Country Link
DE (1) DE102024000990A1 (fr)
WO (1) WO2025201737A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20260092610A1 (en) * 2022-11-07 2026-04-02 Hydac Technology Gmbh Method

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20010037834A1 (en) * 1999-05-12 2001-11-08 Nhk Spring Co., Ltd Accumulator and manufacturing process thereof
DE10112976A1 (de) 2001-03-17 2002-10-02 Hydac Technology Gmbh Hydropneumatischer Druckspeicher
WO2003064862A1 (fr) * 2002-01-31 2003-08-07 Nhk Spring Co., Ltd. Accumulateur
DE102015012357A1 (de) 2015-09-18 2017-03-23 Hydac Technology Gmbh Hydrospeicher
DE102015017026A1 (de) 2015-12-31 2017-07-06 Hydac Technology Gmbh Verfahren zum Herstellen von Druckbehältern
DE102018007280A1 (de) 2018-09-14 2020-03-19 Hydac Technology Gmbh Balgspeicher
DE102022129348A1 (de) 2022-11-07 2024-05-08 Hydac Technology Gmbh Verfahren

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4098297A (en) * 1976-05-11 1978-07-04 Greer Hydraulics, Inc. Pressure accumulator and method of forming the same
US4427028A (en) * 1979-11-13 1984-01-24 Vsi Corporation Resistance welded accumulator device
DE102021000139A1 (de) * 2021-01-14 2022-07-14 Hydac Technology Gmbh Hydrospeicher

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20010037834A1 (en) * 1999-05-12 2001-11-08 Nhk Spring Co., Ltd Accumulator and manufacturing process thereof
DE10112976A1 (de) 2001-03-17 2002-10-02 Hydac Technology Gmbh Hydropneumatischer Druckspeicher
WO2003064862A1 (fr) * 2002-01-31 2003-08-07 Nhk Spring Co., Ltd. Accumulateur
DE102015012357A1 (de) 2015-09-18 2017-03-23 Hydac Technology Gmbh Hydrospeicher
DE102015017026A1 (de) 2015-12-31 2017-07-06 Hydac Technology Gmbh Verfahren zum Herstellen von Druckbehältern
DE102018007280A1 (de) 2018-09-14 2020-03-19 Hydac Technology Gmbh Balgspeicher
DE102022129348A1 (de) 2022-11-07 2024-05-08 Hydac Technology Gmbh Verfahren

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20260092610A1 (en) * 2022-11-07 2026-04-02 Hydac Technology Gmbh Method

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