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 with a accumulator housing and a separating piston which can be moved longitudinally in the accumulator housing and which separates two working spaces from one another within the accumulator housing and which is closed at the ends by a cover part.
• piston accumulators belong to the so-called hydraulic accumulators, which serve, among other things, to absorb certain volumes of pressurized liquid (hydraulic medium) from a hydraulic system and to 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 hydraulic systems, hydropneumatic (gas-pressurized) accumulators with a separating element are used today, with a piston serving as the separating element in the piston accumulators, which separates a liquid space as a working space from a gas space as a further working space within the accumulator housing of the piston accumulator.
• hydraulic accumulators which serve, among other things, to absorb certain volumes of pressurized liquid (hydraulic medium) from a hydraulic system and to 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
• Nitrogen is regularly used as the working gas and the gas-tight piston largely allows decoupling from the gas space to the liquid space.
• the liquid part is connected to the hydraulic circuit so that when the pressure rises, the piston accumulator absorbs liquid and the gas is compressed. When the pressure drops, the compressed gas expands and displaces the stored hydraulic fluid back into the hydraulic circuit.
• piston accumulators One advantage of piston accumulators is that they can "work" in any position, but a vertical arrangement with the gas side upwards is preferred so that dirt particles from the liquid are prevented from settling on the piston seals.
• the essential components of a piston accumulator are therefore an outer cylinder tube as the accumulator housing, the piston as a separating element with its sealing system and the end caps, which at the same time also contain a liquid and gas connection as cover parts.
• the accumulator housing regularly has two functions, namely to store the internal pressure and to ensure that the piston is guided within the accumulator housing.
• the end parts of the cover which close off the interior of the storage housing from the surroundings, are provided on the outer circumference with an external thread, which can be screwed into a corresponding internal thread along the free longitudinal edge of the storage housing over a predeterminable distance. Establishing the thread connection in question is time-consuming, which increases the cost of manufacturing the piston accumulator accordingly. Furthermore, safety measures are to be taken to secure the inserted cover part in its position in the storage case.
• the object of the invention is to further improve the known manufacturing methods for piston accumulators in such a way that a functionally reliable and positionally secure connection is avoided while avoiding the otherwise usual threaded connections a cover part is ensured in the accumulator housing of a piston accumulator.
• a related problem is solved by a method with the features of claim 1 in its entirety.
• At least one of the two cover parts is inserted with its side opposite one side against a stop inside the storage housing and / or that the respective cover part is held in place by the clamping force of the supplied longitudinal edge End position is held. If a stop is provided on the inside of the storage housing, the cover part can be fixed against this stop during the infeed movement of the free longitudinal edge of the storage housing. Additionally or alternatively, there is also the possibility of simply inserting the cover part at the free end of the storage housing and then triggering the infeed movement for the free longitudinal edge of the storage housing.
• the infeed movement can take place against the top of the cover, provided that the cover part is held in such a position; but it would also be conceivable for a free delivery movement for to execute the longitudinal edge, in order then to move the cover part against the free longitudinal edge in the ready-to-operate state via the piston guided in the storage housing, which then performs the clamping here.
• a forming tool is provided for the infeed movement of the longitudinal edge of the storage housing, which, provided with infeed bevels, places the longitudinal edge of the storage housing on the cover part in such a way that it is fixed in the manner of the aforementioned clamping fit in the storage housing.
• two forming tools on opposite sides carry out the fixing process for the respective end-side cover part in a common infeed movement on the storage housing by acting on the free longitudinal edge of the storage housing in each case. It has proven to be very advantageous for the generation of high fixing forces to feed both free ends of the cylindrical storage housing equally, the forming tool acting at one end of the storage housing being able to reliably support the forces which occur from the other side during the forming process with the other forming tool can be introduced into the storage case.
• FIG. 2 shows in longitudinal section the upper part of a first embodiment of a piston accumulator housing with a forming tool lying above it;
• the piston accumulator shown in FIG. 1 and belonging to the prior art has an outer cylinder tube as the accumulator housing 10, in which a piston 12 with its sealing system 14 on the outer circumference is guided as a separating element and can be moved longitudinally.
• the piston 12 separates two working spaces 16, 18 from one another within the storage housing 10, one working space 16 serving to hold a working gas, in particular in the form of nitrogen, and the further second working space 18 forms the so-called. Liquid space for the piston accumulator.
• the travel position of the piston 12 and thus the volume fractions of gas and fluid in the working spaces 16 and 18 vary.
• At the front end of the accumulator housing 10 there is a cover part 20, 22 with a gas connection 24 for refilling of the nitrogen working gas and with a liquid connection 26 for connecting the piston accumulator to an overall hydraulic system, not shown.
• the two cover parts 20, 22 are each provided with an external thread 28, which can be brought into engagement with an internal thread 30, which is arranged running along the free longitudinal edge 32 and opens out into the open.
• an internal thread 30 which is arranged running along the free longitudinal edge 32 and opens out 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. Attaching the thread sections
• a possible anti-twist device for the respective cover part 20, 22 can be that a conventional adhesive lock is provided along the threads 28, 30, or the cover part is held in position with a conventional holding hole (with and without thread).
• FIGS. 2ff allows a functionally reliable connection of the cover part to the associated storage housing 10 in a cost-effective manner.
• FIGS. 2ff allows a functionally reliable connection of the cover part to the associated storage housing 10 in a cost-effective manner.
• FIG. 2ff only the upper end of the storage housing 10 was shown in FIG. provides together with the upper cover part 20.
• the method according to the invention is characterized, inter alia, by the fact that the respective cover part, here the cover part 20, is inserted into the storage housing 10 with its one lower side 36 against a stop 38 in the form of an annular surface, with the opposite side 40 of the cover part 20, this is fixed over the free longitudinal edge 32 of the storage housing 10, the longitudinal edge 32 experiencing an infeed movement on the cover part 20 for this purpose, which will be explained in more detail below.
• a forming tool 42 is provided, which is provided with at least one infeed bevel 44, which places the longitudinal edge 32 on the cover part 20 in such a way that it rests in the manner of a clamp fit in the storage housing 10 between the stop 38 and the Longitudinal edge 32 is set.
• the upper side 40 of the cover part 20 is provided with a contact surface 46 which is arranged to be conical to the longitudinal axis 48 of the storage housing 10.
• the inclination of the contact surface 46 in question corresponds to the inclination of the feed bevel 44 of the forming tool 42; however, other obvious inclinations or inclinations are also conceivable here.
• the feed direction for the forming tool 42 is the longitudinal axis 48 of the accumulator housing 10 or of the entire piston accumulator.
• the separating element in the form of the piston 12 has been omitted in FIG. 2, as has the gas connection 24 shown in FIG. 1, which is also an integral part of the upper cover part 20 here.
• the upper free end of the storage housing with its upper longitudinal edge 32 has a contour in accordance with one of the representations according to FIGS reduced, the transition point between the different wall thicknesses forming the stop 38 for the cover part 20.
• the longitudinal edge 32 is preferably provided with a conical insertion bevel 50 on its side facing the cover part 20 and oriented towards the outside. The corresponding insertion slope 50 facilitates the insertion of the cover part 20 into the free upper end of the storage housing 10, which will be explained in more detail below.
• the free longitudinal edge 32 which is shown in particular by the illustration according to FIGS. 4 and 5, can be provided on the outer circumferential side and oriented towards the free end of the storage housing 10 with a sliding bevel 52, which makes it easier for the longitudinal edge 32, from its cylindrical shape 3 to 6 change to a delivered inclined position, the sliding bevel 52 then sliding along the infeed bevel 44 of the shaping tool 42, provided that this is increasingly placed on the storage housing 10 in the infeed direction. If the infeed movement is completed with the forming tool 42, the longitudinal edge 32 is inclined to the cover part 20 along its contact surface 46 in the manner of a fixing bevel and thus holds the cover part 20 against the stop 38 inside the storage housing 10.
• the free longitudinal edge 32 along its free end has a projection the upper second side 40 of the cover part 20 guided.
• the forming tool 42 is moved away again from the storage housing 10 and then assumes, for example, its upper position shown in FIG.
• the forming process for the respective longitudinal edge 32 of the storage housing 10 is preferably carried out cold; however, hot forming is also conceivable with corresponding heating of the storage housing material and preferably of the forming tool 42 itself.
• a common, well-formable steel material is used as the material for the storage housing 10 with its longitudinal edge 32.
• the height of the cover part 20 is in each case adapted to the operating conditions predetermined by the operation of the storage.
• the cover part 20 is at least twice as long 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 top of the cover.
• the cover part 20 can protrude beyond the end of the longitudinal edge 32 of the storage housing 10; or, according to an embodiment not shown in detail, flush at the same height.
• the fixing process for the respective end cover part 20, 22 is carried out simultaneously and together with essentially the same forming forces by acting on the free longitudinal edge 32 of the storage housing 10. It has been shown that in the forming solution in question, the opposite forming tool can simultaneously absorb the forces of the other forming tool as they occur during the forming process. In the case of this configuration, it is possible to save on complex support devices on the respectively opposite sides, where the forming tool 42 does not act. This also leads to a harmonious introduction of force into the storage housing 10 without the occurrence of damaging force peaks.
• a placement tool 56 which, according to the illustration according to FIG. 4, comprises the free longitudinal edge 32 of the storage housing 10, the respective cover part 20, 22 into the storage housing 10 up to the stop 38 in the form of Ring surface are introduced.
• the placement tool 56 has a feed slope 58, along which the cover part 20, 22 can slide on the outer circumferential side. The use of the assembly tool 56 ensures that any possible damage to the seal 34 of the respective cover part 20, 22 is avoided.
• the placement tool 56 has a receiving space 60 into which the upper end of the storage housing 10 can be received, so that the feed slope 58 is flush with the upper edge of the longitudinal edge 32 and, moreover, continuously into the receiving area 62 for the actual cover part 20 , 22 passes into the memory housing 10.
• the storage housing 10 is provided along its upper longitudinal edge 32 on the inside circumference and widening outwards with the insertion bevel 50, which results in a kind of shortened slip edge over which the respective cover part 20, 22 also introduce and then determine later.
• the relevant variant can be selected if the cover seal 34 proves to be robust and should not be too susceptible to damage.
• the same reference numerals are used for the same components and the modified embodiment is only described in terms of process technology insofar as it differs substantially from the method shown above.
• the upper cover part 20 is held by the free longitudinal edge 32 of the storage housing 10 in such a way that the upper side projects beyond the end of the free longitudinal edge 32 with a predeterminable projection.
• the stop 38 for the cover part 20 is provided with a bevel, against which the cover part 20 rests in a stepped step.
• the ring seal 34 is in turn received on the outer circumference side, and because of the shown grading of the storage housing 10 and the cover part 20, there is the possibility of finely machining the storage housing 10 for a clean system with the sealing ring 34 at this point and the inside of the storage housing 10 to be left essentially unprocessed, provided that the adjustment range for the free longitudinal edges 32 of the storage housing 10 is addressed.
• cover parts 20, 22 can therefore be A wide variety of designs fit precisely and securely and in a pressure-tight manner in the storage housings 10 and screw connections which are to be installed at a high cost and which are additionally to be secured can be completely dispensed with.

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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)

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• 2003
  • 2003-02-01 DE DE10303988A patent/DE10303988A1/de not_active Withdrawn
• 2004
  • 2004-01-15 JP JP2006501547A patent/JP2006516706A/ja not_active Withdrawn
  • 2004-01-15 EP EP04702305A patent/EP1588056B1/fr not_active Expired - Lifetime
  • 2004-01-15 AT AT04702305T patent/ATE365870T1/de not_active IP Right Cessation
  • 2004-01-15 DE DE502004009375T patent/DE502004009375D1/de not_active Expired - Lifetime
  • 2004-01-15 EP EP07007946A patent/EP1808605B1/fr not_active Expired - Lifetime
  • 2004-01-15 AT AT07007946T patent/ATE428861T1/de not_active IP Right Cessation
  • 2004-01-15 DE DE502004004183T patent/DE502004004183D1/de not_active Expired - Lifetime
  • 2004-01-15 WO PCT/EP2004/000230 patent/WO2004067968A1/fr active IP Right Grant
• 2005
  • 2005-06-22 US US10/540,011 patent/US8387253B2/en active Active

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