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EP1601878A1 - Piston-type accumulator - Google Patents

Piston-type accumulator

Info

Publication number
EP1601878A1
EP1601878A1 EP04703100A EP04703100A EP1601878A1 EP 1601878 A1 EP1601878 A1 EP 1601878A1 EP 04703100 A EP04703100 A EP 04703100A EP 04703100 A EP04703100 A EP 04703100A EP 1601878 A1 EP1601878 A1 EP 1601878A1
Authority
EP
European Patent Office
Prior art keywords
piston
cylinder tube
accumulator according
bodies
magnetic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP04703100A
Other languages
German (de)
French (fr)
Other versions
EP1601878B1 (en
Inventor
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
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 EP1601878A1 publication Critical patent/EP1601878A1/en
Application granted granted Critical
Publication of EP1601878B1 publication Critical patent/EP1601878B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/04—Accumulators
    • F15B1/08—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor
    • 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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/28—Means for indicating the position, e.g. end of stroke
    • F15B15/2807—Position switches, i.e. means for sensing of discrete positions only, e.g. limit switches
    • 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
    • F15B2201/30—Accumulator separating means
    • F15B2201/315—Accumulator separating means having flexible separating means
    • F15B2201/3158—Guides for the flexible separating means, e.g. for a collapsed bladder
    • 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
    • F15B2201/50—Monitoring, detection and testing means for accumulators
    • F15B2201/515—Position detection for separating means

Definitions

  • the invention relates to piston accumulators, as they are intended, among other things, in connection with hydraulic systems to take up certain volumes of pressurized liquid (for example hydraulic medium) and to return these to the system if required.
  • pressurized liquid for example hydraulic medium
  • hydropneumatic (gas-pressurized) accumulators are used today, with the movable separating element within the accumulator housing separating a liquid space as the one working space from a gas storage space as the further working space. Nitrogen gas is regularly used as the working gas, and the piston forming the gas-tight separating element largely allows decoupling from the gas storage space to the liquid space.
  • the liquid part is connected to the hydraulic circuit of the system, so that the accumulator absorbs liquid when the pressure rises and the gas is compressed. When the pressure drops, the compressed gas expands and displaces the stored hydraulic fluid back into the hydraulic circuit. As a result of the changes in the volumes of gas storage space and liquid space that occur during operation, there is a corresponding axial movement of the piston within the storage housing.
  • the gas pre-filling prevailing in the gas storage pressure has a pressure value adapted to the pressure level of the liquid part, so that the piston is located at a suitable point within the cylinder housing, so that the piston can carry out the required working movements in the axial direction between the end positions in the storage housing.
  • the object of the invention is to create a piston accumulator which enables the size of the volumes of the working spaces and thus the position of the piston to be determined in a simple manner during operation.
  • the piston is formed from non-magnetizable material
  • the magnet arrangement has a plurality of permanent magnets which are arranged at a radial distance from the circumference of the piston in a row which is concentric with the longitudinal axis of the piston and has the same polarity with respect to one another such that their polar axes extend parallel to the longitudinal axis.
  • the permanent magnets are held on the piston between ring bodies made of magnetizable material, which abut the pole ends of the permanent magnets.
  • ring bodies made of magnetizable material can be designed in such a way that they are approximated with parts of their peripheral areas to the inner wall of the cylinder tube and form pole pieces for the introduction of magnetic flux into the wall of the cylinder tube.
  • FIG. 1 shows a schematically simplified longitudinal section of an embodiment of the piston accumulator according to the invention
  • 2 shows a longitudinal section of the piston of the embodiment of FIG. 1 drawn on a somewhat larger scale than FIG. 1
  • FIG. 3 shows a plan view of the one of the two sitting on the piston of the embodiment sitting on the same scale as FIG. 2 , a pole piece of the annular body forming the piston-side magnet arrangement.
  • the accumulator housing of the exemplary embodiment of the piston accumulator according to the invention shown in the drawing has a circular cylinder tube 1 made of magnetizable material, for example made of a steel alloy.
  • a piston 3 made of non-magnetizable material for example a non-magnetizable steel (stainless steel) or an aluminum alloy or the like, can be moved back and forth in the axial direction, which is indicated by a longitudinal axis 5.
  • the piston 3 serves as a movable separating element between two working spaces located in the cylinder tube 1, in the exemplary embodiment a gas storage space 7 and a fluid space 9.
  • the cylinder tube 1 is closed by a screwed-in cylinder cover 11. This is traversed by a gas channel 13 to which a gas valve or a filling valve can be connected (neither of which is shown). In a similar manner, the cylinder tube 1 is closed at the end assigned to the fluid chamber 9 by a screwed-in cover 15 which has a central fluid passage 17.
  • the piston 3 has a trough-like inner trough 19 which is concentric with the axis 5 and is open at the piston end facing the gas storage space 7, so that it increases the volume of the gas storage space 7.
  • the piston 3 On of the piston side having the open end of the recess 19, the piston 3 has a circumferential section 21 which, compared to a subsequent circumferential section 23, which extends to the piston end facing the fluid chamber 9, has a reduced outer diameter.
  • the latter circumferential section 23 is adapted in the outer diameter to the inner diameter of the cylinder tube 1 so that it is guided gas-tight on the inside of the cylinder tube 1.
  • the circumferential section 23 has circumferential annular grooves, in which piston seals 25 and a piston guide strip 27 are seated, which are of a type customary in piston feeders.
  • annular bodies 29 and 31 On the circumferential section 21 of the piston 3, which has the reduced outside diameter, there are annular bodies 29 and 31, both of which are made of magnetizable material.
  • the annular body 31 shown at the bottom in FIGS. 1 and 2 is shown separately in a top view in FIG. 3.
  • the upper side of the ring body 31 has a row of depressions 33 (which are not all shown in FIG. 3) which extend along its circumference and concentrically and which form circular depressions of shallow depth and regularly - Are arranged angular distances along the entire circumference ' , 22 depressions 33 are provided in the illustrated embodiment.
  • the depressions formed by the depressions 33 serve as a seat for a circular cylindrical permanent magnet body 35, the pole axes of which run parallel to the longitudinal axis 5 and which rest with their pole end surface on the bottom of the depressions 33.
  • the row of magnetic bodies 35 is therefore clamped between the ring bodies 29 and 31.
  • a screw ring 37 which is screwed onto an external thread 39 at the adjacent piston end holds the ring bodies 29 and 31 in contact with the magnetic bodies 35 and in contact with a damping element 41 which is inserted between the lower ring body 31 and a shoulder surface 43, one in one Radial plane plane surface at the transition between the peripheral portions 21 and 23 of the piston 3 forms.
  • the damping element 41 secures the magnet and pole thrust arrangement when the piston 3 hits the piston housing base, which is not shown in detail.
  • the ring bodies 29 and 31 in their circumferential area 45 adjoining the magnetic bodies 35 have an outer diameter which results in a radial distance from the cylinder tube 1, so that there is no free space for receiving them Magnetizable guide and sealing elements 47 (see FIG. 2) is formed.
  • the outer diameter of the ring bodies 29 and 31 approximates the inner diameter of the cylinder tube 1.
  • the ring bodies 29 and 31 form pole pieces for the introduction of the magnetic flux into the
  • two Hall sensors 51 are attached to the outside of the cylinder tube 1, which respond to changes in the magnetic field as they result when the piston 3 with the magnet arrangement located on it along its stroke in Cylinder tube 1 moves.
  • the connecting cables of the Hall sensors 51 designated 53 in FIG. 1 these are on the cylinder tube 1 in relation to one another opposite orientation attached, so that an approach of the piston 3 to its upper end position and its lower end position, which corresponds to an amplification of the magnetic field with different polarity of the field lines at the Hall sensor 51 in question, each leads to a positive signal increase in the Hall Tension leads.
  • FIG. 1 As can also be seen from FIG.
  • the Hall sensors 51 are arranged at such an axial distance from one another that the one Hall sensor 51 is located in the area in which the magnetic bodies 35 are located at the one end position of the piston 3 , and the other Hall sensor 51, offset toward the other end of the cylinder tube 1, is attached in an area where the magnetic bodies 35 of the piston 3 are in its other end position.
  • the Hall voltages generated by the Hall sensors 51 and characterizing the position of the piston 3 can be processed in any suitable manner to obtain the position indicator of the piston 3.
  • the introduction of the magnetic flux of the magnetic bodies 35 into the wall of the cylinder tube 1 via the ring bodies 29 and 31 functioning as pole shoes results in significant signal values due to the Hall effect.
  • the coupling of the flow via the ring bodies 29 and 31 serving as a pole shoe need only be selected to be so strong that sufficient signal values are achieved.
  • a decoupling to values sufficient for the display purposes can be provided, for example by a small air gap between the circumferential range 49 and the cylinder tube 1 is provided or a thin-walled piston guide means of non-magnetizable material is inserted between the peripheral region 49 and the cylinder tube 1.
  • a decoupling to values sufficient for the display purposes can be provided, for example by a small air gap between the circumferential range 49 and the cylinder tube 1 is provided or a thin-walled piston guide means of non-magnetizable material is inserted between the peripheral region 49 and the cylinder tube 1.
  • the piston accumulator according to the invention there is also the possibility of omitting the depressions 33 and the two annular bodies 29 and 31 are then formed flat on their mutually facing sides, the cylindrical magnetic bodies 35 then being located between the two flat surfaces of the annular bodies 29 and 31 extend axially with radial distances from each other.
  • the arrangement in question is basically reproduced in a top view in FIG. 3, provided that the top of the cylindrical magnetic bodies
  • only one Hall sensor 51 can also be provided for position monitoring or determination of the piston 3.
  • more than two Hall sensors 51 can monitor the respective travel position of the piston 3 and forward them to a corresponding evaluation electronics. Accordingly, with the solution according to the invention, end position monitoring of the piston 3 by the two Hall sensors 51 as shown in FIG. 1 is also possible.

Landscapes

  • 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)
  • Actuator (AREA)

Abstract

A piston-type accumulator has: a) an accumulator housing in the form of a cylinder tube (1) made of magnetizable material, which defines an axial direction of the housing; b) a piston (3), which can be axially displaced over a stroke path inside the cylinder tube (1) and which forms a moving separating element that, inside the accumulator housing, separates two working spaces (7 and 9) from one another; c) a magnet arrangement (29, 31, 35), placed on the piston (3) and generating a field on the wall of the cylinder tube (1), and; d) a magnetic field sensor device located on the exterior of the cylinder tube (1) and having at least one Hall sensor (51). The Hall sensor is mounted on the exterior of the cylinder tube (1) and responds to the field generated by the magnet arrangement (29, 31, 35) on the piston (3) to determine the position of the piston (3) along the stroke path.

Description

Hydac Technology GmbH, Industriegebiet, 66280 Sulzbach/Saar Hydac Technology GmbH, industrial area, 66280 Sulzbach / Saar
Kolbenspeicherpiston accumulators
Die Erfindung bezieht sich auf Kolbenspeicher, wie sie, unter anderem, in Verbindung mit Hydroanlagen dazu vorgesehen sind, bestimmte Volumina unter Druck stehender Flüssigkeit (beispielsweise Hydraulikmedium) aufzu- nehmen und diese bei Bedarf an die Anlage zurückzugeben. In den meisten Hydroanlagen werden heutzutage hydropneumatische (gasbeaufschlagte) Speicher eingesetzt, wobei das bewegliche Trennelement innerhalb des Speichergehäuses einen Flüssigkeitsraum als den einen Arbeitsraum von einem Gasvorratsraum als dem weiteren Arbeitsraum trennt. Als Arbeitsgas kommt regelmäßig Stickstoffgas zum Einsatz, und der das gasdichte Trennelement bildende Kolben erlaubt weitgehend eine Entkoppelung von Gasvorratsraum zu Flüssigkeitsraum.The invention relates to piston accumulators, as they are intended, among other things, in connection with hydraulic systems to take up certain volumes of pressurized liquid (for example hydraulic medium) and to return these to the system if required. In most hydraulic systems, hydropneumatic (gas-pressurized) accumulators are used today, with the movable separating element within the accumulator housing separating a liquid space as the one working space from a gas storage space as the further working space. Nitrogen gas is regularly used as the working gas, and the piston forming the gas-tight separating element largely allows decoupling from the gas storage space to the liquid space.
Der Flüssigkeitsteil steht mit dem Hydrokreislauf der Anlage in Verbindung, so dass der Speicher beim Anstieg des Druckes 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. Durch die sich im Betrieb ergebenden Veränderungen der Volumina von Gasvorratsraum und Flüssigkeitsraum ergibt sich jeweils eine entsprechende Axialbewegung des Kolbens innerhalb des Speichergehäuses.The liquid part is connected to the hydraulic circuit of the system, so that the accumulator absorbs liquid when the pressure rises and the gas is compressed. When the pressure drops, the compressed gas expands and displaces the stored hydraulic fluid back into the hydraulic circuit. As a result of the changes in the volumes of gas storage space and liquid space that occur during operation, there is a corresponding axial movement of the piston within the storage housing.
Für das gewünschte, einwandfreie Betriebsverhalten von Kolbenspeichern ist Voraussetzung, dass der im Gasvorratsraum herrschende Gas-Vorfüll- druck einen an das Druckniveau des Flüssigkeitsteiles angepaßten Druckwert besitzt, so dass sich der Kolben an einer geeigneten Stelle innerhalb des Zylindergehäuses befindet, so dass der Kolben die erforderlichen Arbeitsbewegungen in Axialrichtung zwischen den Endpositionen im Spei- chergehäuse ausführen kann.For the desired, fault-free operating behavior of piston accumulators, it is a prerequisite that the gas pre-filling prevailing in the gas storage pressure has a pressure value adapted to the pressure level of the liquid part, so that the piston is located at a suitable point within the cylinder housing, so that the piston can carry out the required working movements in the axial direction between the end positions in the storage housing.
Im Hinblick hierauf stellt sich die Erfindung die Aufgabe, einen Kolbenspeicher zu schaffen, der während des Betriebes eine Feststellung der Größe der Volumina der Arbeitsräume und damit der Position des Kolbens auf einfache Weise ermöglicht.In view of this, the object of the invention is to create a piston accumulator which enables the size of the volumes of the working spaces and thus the position of the piston to be determined in a simple manner during operation.
Erfindungsgemäß ist diese Aufgabe durch einen Kolbenspeicher gelöst, der die in Anspruch 1 angegebenen Merkmale a) bis d) aufweist.According to the invention, this object is achieved by a piston accumulator which has the features a) to d) specified in claim 1.
Danach steht bei dem erfindungsgemäßen Kolbenspeicher eine berührungslose, durch die Wandung des Speichergehäuses nach außen übertragene Anzeige für die Position des Kolbens zur Verfügung, so dass während des Betriebes eine einfache und sichere Überwachung des Betriebszustands des Speichers ermöglicht ist.Thereafter, in the piston accumulator according to the invention, a contactless display for the position of the piston, which is transmitted through the wall of the accumulator housing to the outside, is available, so that simple and reliable monitoring of the operating state of the accumulator is made possible during operation.
Dadurch, dass erfindungsgemäß mindestens ein, vorzugsweise zwei Hall- Sensoren als Magnetfeldsensoren vorgesehen sind, die auf Feldänderungen ansprechen, die sich aufgrund von Kolbenbewegungen ergeben, steht für die Anzeige der Kolbenposition ein elektrisches Signal zur Verfügung, was vorteilhafte Möglichkeiten der Gestaltung der Positionsanzeige eröffnet, beispielsweise in Form einer signalgesteuerten optischen und/oder akustischen Anzeige, gegebenenfalls auch in Form einer Fernanzeige. Bei vorteilhaften Ausführungsbeispielen ist der Kolben aus nicht- magnetisierbarem Werkstoff gebildet, und die Magnetanordnung weist eine Mehrzahl von Dauermagneten auf, die in einem radialen Abstand vom Umfang des Kolbens in einer zur Längsachse des Kolbens konzentrischen Reihe mit zueinander gleicher Polarität so angeordnet sind, dass sich ihre Polachsen parallel zur Längsachse erstrecken.Due to the fact that according to the invention at least one, preferably two, Hall sensors are provided as magnetic field sensors, which respond to field changes resulting from piston movements, an electrical signal is available for displaying the piston position, which opens up advantageous possibilities for designing the position indicator, for example in the form of a signal-controlled optical and / or acoustic display, possibly also in the form of a remote display. In advantageous exemplary embodiments, the piston is formed from non-magnetizable material, and the magnet arrangement has a plurality of permanent magnets which are arranged at a radial distance from the circumference of the piston in a row which is concentric with the longitudinal axis of the piston and has the same polarity with respect to one another such that their polar axes extend parallel to the longitudinal axis.
Bei solcher Lage der Polachsen führt die Einleitung des magnetischen Flusses in die Wand des aus magnetisierbarem Werkstoff bestehenden Zylinder- rohres zu einem Feldlinienverlauf, bei dem sich ein hoher Anteil der Feldlinien in Längsrichtung erstreckt. Kolbenbewegungen in der einen oder anderen Axialrichtung ergeben daher aufgrund der Annäherung an den einen oder anderen Hall-Sensor signifikante, durch den Hall-Effekt bewirkte Signaländerungen.With such a position of the polar axes, the introduction of the magnetic flux into the wall of the cylinder tube made of magnetizable material leads to a field line course in which a large proportion of the field lines extend in the longitudinal direction. Piston movements in one or the other axial direction therefore result in significant signal changes caused by the Hall effect due to the approach to one or the other Hall sensor.
Bei einem besonders vorteilhaften Ausführungsbeispiel sind die Dauermagnete am Kolben zwischen Ringkörpern aus magnetisierbarem Werkstoff gehalten, die an den Polenden der Dauermagente anliegen. Diese Ringkörper aus magnetisierbarem Werkstoff können so gestaltet sein, dass sie mit Teilen ihrer Umfangsbereiche an die Innenwand des Zylinderrohres angenähert sind und Polschuhe für das Einleiten magnetischen Flusses in die Wand des Zylinderrohres bilden.In a particularly advantageous embodiment, the permanent magnets are held on the piston between ring bodies made of magnetizable material, which abut the pole ends of the permanent magnets. These ring bodies made of magnetizable material can be designed in such a way that they are approximated with parts of their peripheral areas to the inner wall of the cylinder tube and form pole pieces for the introduction of magnetic flux into the wall of the cylinder tube.
Nachstehend ist die Erfindung anhand eines in der Zeichnung dargestellten Ausführungsbeispieies im einzelnen erläutert. Es zeigen:The invention is explained in detail below with reference to an exemplary embodiment shown in the drawing. Show it:
o Fig. 1 einen schematisch vereinfacht gezeichneten Längsschnitt eines Ausführungsbeispieles des erfindungsgemäßen Kolbenspeichers; o Fig. 2 einen gegenüber Fig. 1 in etwas größerem Maßstab gezeichneten Längsschnitt nur des Kolbens des Ausführungsbeispieles von Fig. 1. und o Fig. 3 eine in gleichem Maßstab wie Fig. 2 gezeichnete Draufsicht des einen der beiden auf dem Kolben des Ausführungsbeispieles sitzenden, einen Polschuh der kolbenseitigen Magnetanordnung bildenden Ringkörpers.1 shows a schematically simplified longitudinal section of an embodiment of the piston accumulator according to the invention; 2 shows a longitudinal section of the piston of the embodiment of FIG. 1 drawn on a somewhat larger scale than FIG. 1, and FIG. 3 shows a plan view of the one of the two sitting on the piston of the embodiment sitting on the same scale as FIG. 2 , a pole piece of the annular body forming the piston-side magnet arrangement.
Das Speichergehäuse des in der Zeichnung dargestellten Ausführungsbeispieles des erfindungsgemäßen Kolbenspeichers weist ein kreisrundes Zy- linderrohr 1 aus magnetisierbarem Werkstoff auf, beispielsweise aus einer Stahllegierung. Im Zyiinderrohr 1 ist ein Kolben 3 aus nicht-magnetisier- barem Werkstoff, beispielsweise einem nicht-magnetisierbarem Stahl (Edelstahl) oder einer Aluminiumlegierung oder dergleichen, in Axialrichtung hin und her verfahrbar, die durch eine Längsachse 5 angedeutet ist. Der Kolben 3 dient als bewegliches Trennelement zwischen zwei im Zylinderrohr 1 befindlichen Arbeitsräumen, beim Ausführungsbeispiel einem Gasvorratsraum 7 und einem Fluidraum 9.The accumulator housing of the exemplary embodiment of the piston accumulator according to the invention shown in the drawing has a circular cylinder tube 1 made of magnetizable material, for example made of a steel alloy. In the cylinder tube 1, a piston 3 made of non-magnetizable material, for example a non-magnetizable steel (stainless steel) or an aluminum alloy or the like, can be moved back and forth in the axial direction, which is indicated by a longitudinal axis 5. The piston 3 serves as a movable separating element between two working spaces located in the cylinder tube 1, in the exemplary embodiment a gas storage space 7 and a fluid space 9.
An dem den Gasvorratsraum 7 abschließenden Ende ist das Zylinderrohr 1 durch einen eingeschraubten Zylinderdeckel 1 1 abgeschlossen. Dieser ist durch einen Gaskanal 13 durchzogen, an dem ein Gasventil oder eine Füllarmatur anschließbar ist (beides nicht dargestellt). In ähnlicher Weise ist das Zyiinderrohr 1 an dem dem Fluidraum 9 zugeordneten Ende durch einen eingeschraubten Deckel 15 abgeschlossen, der einen zentralen Fluid- durch laß 17 aufweist.At the end of the gas storage space 7, the cylinder tube 1 is closed by a screwed-in cylinder cover 11. This is traversed by a gas channel 13 to which a gas valve or a filling valve can be connected (neither of which is shown). In a similar manner, the cylinder tube 1 is closed at the end assigned to the fluid chamber 9 by a screwed-in cover 15 which has a central fluid passage 17.
Der Kolben 3 weist eine trogartige innere Mulde 19 auf, die zur Achse 5 konzentrisch und an dem dem Gasvorratsraum 7 zugewandten Kolbenende offen ist, so dass sie das Volumen des Gasvorratsrau es 7 vergrößert. An der das offene Ende der Mulde 19 aufweisenden Kolbenseite weist der Kolben 3 einen Umfangsabschnitt 21 auf, der gegenüber einem anschließenden Umfangsabschnitt 23, der sich bis zu dem dem Fluidraum 9 zugewandten Kolbenende erstreckt, einen verringerten Außendurchmesser besitzt. Der letztgenannte Umfangsabschnitt 23 ist im Außendurchmesser an den Innendurchmesser des Zylinderrohres 1 so angepaßt, dass er an der Innenseite des Zylinderrohres 1 gasdicht geführt ist. Zu diesem Zwecke weist der Umfangsabschnitt 23 umfängliche Ringnuten auf, in denen Kolbendichtungen 25 und eine Kolbenführungsleiste 27 sitzen, die von bei Kolbenspei- ehern üblicher Bauart sind.The piston 3 has a trough-like inner trough 19 which is concentric with the axis 5 and is open at the piston end facing the gas storage space 7, so that it increases the volume of the gas storage space 7. On of the piston side having the open end of the recess 19, the piston 3 has a circumferential section 21 which, compared to a subsequent circumferential section 23, which extends to the piston end facing the fluid chamber 9, has a reduced outer diameter. The latter circumferential section 23 is adapted in the outer diameter to the inner diameter of the cylinder tube 1 so that it is guided gas-tight on the inside of the cylinder tube 1. For this purpose, the circumferential section 23 has circumferential annular grooves, in which piston seals 25 and a piston guide strip 27 are seated, which are of a type customary in piston feeders.
Auf dem den verringerten Außendurchmesser aufweisenden Umfangsabschnitt 21 des Kolben 3 befinden sich Ringkörper 29 und 31 , die beide aus magnetisierbarem Werkstoff gefertigt sind. Der in Fig. 1 und 2 untenliegend eingezeichnete Ringkörper 31 ist in Fig. 3 gesondert in Draufsicht dargestellt. Wie aus dieser Fig. zu ersehen ist, weist die Oberseite des Ringkörpers 31 eine sich entlang von dessen Umfang und konzentrisch erstreckende Reihe von Einsenkungen 33 (die in Fig. 3 nicht sämtliche gezeichnet sind) auf, die kreisrunde Vertiefungen geringer Tiefe bilden und in regelmä- ßigen Winkelabständen längs des gesamten Umfangs' angeordnet sind, wobei beim dargestellten Ausführungsbeispiel 22 Einsenkungen 33 vorgesehen sind. Die durch die Einsenkungen 33 gebildeten Vertiefungen dienen als Sitz für je einen kreiszylindrischen Dauermagnetkörper 35, deren Polachsen parallel zur Längsachse 5 verlaufen und die mit ihrer Polendfläche am Bo- den der Einsenkungen 33 anliegen.On the circumferential section 21 of the piston 3, which has the reduced outside diameter, there are annular bodies 29 and 31, both of which are made of magnetizable material. The annular body 31 shown at the bottom in FIGS. 1 and 2 is shown separately in a top view in FIG. 3. As can be seen from this figure, the upper side of the ring body 31 has a row of depressions 33 (which are not all shown in FIG. 3) which extend along its circumference and concentrically and which form circular depressions of shallow depth and regularly - Are arranged angular distances along the entire circumference ' , 22 depressions 33 are provided in the illustrated embodiment. The depressions formed by the depressions 33 serve as a seat for a circular cylindrical permanent magnet body 35, the pole axes of which run parallel to the longitudinal axis 5 and which rest with their pole end surface on the bottom of the depressions 33.
Der zum Ringkörper 31 spiegelbildlich ausgebildete, in den Fig. obere Ringkörper 29, weist ebenfalls entsprechende Einsenkungen 33 auf, die den Sitz für die in der Fig. oben liegenden Polendflächen der Dauermagnetkör- per 35 bilden. Die Reihe der Magnetkörper 35 ist daher zwischen den Ringkörpern 29 und 31 eingespannt. Ein Schraubring 37 der auf ein Außengewinde 39 am benachbarten Kolbenende aufgeschraubt ist, hält die Ringkörper 29 und 31 in Anlage an den Magnetkörpern 35 und in Anlage an einem Dämpfungselement 41, das zwischen unteren Ringkörper 31 und einer Schulterfläche 43 eingefügt ist, die eine in einer Radialebene liegende Planfläche am Übergang zwischen den Umfangsabschnitten 21 und 23 des Kolbens 3 bildet. Das Dämpfungselement 41 sichert die Magnet- und Polschubanordnung bei einem etwaigen Aufstoßen des Kolbens 3 auf den nicht näher dargestellten Kolben-Gehäuseboden.The ring body 29, which is designed as a mirror image of the ring body 31 and has upper depressions 33 in the figures, also has corresponding depressions 33 which seat the pole end surfaces of the permanent magnet bodies which form per 35. The row of magnetic bodies 35 is therefore clamped between the ring bodies 29 and 31. A screw ring 37 which is screwed onto an external thread 39 at the adjacent piston end holds the ring bodies 29 and 31 in contact with the magnetic bodies 35 and in contact with a damping element 41 which is inserted between the lower ring body 31 and a shoulder surface 43, one in one Radial plane plane surface at the transition between the peripheral portions 21 and 23 of the piston 3 forms. The damping element 41 secures the magnet and pole thrust arrangement when the piston 3 hits the piston housing base, which is not shown in detail.
Wie aus Fig. 1 und 2 zu ersehen ist, weisen die Ringkörper 29 und 31 in ihrem an die Magnetkörper 35 angrenzenden Umfangsbereich 45 einen Außendurchmesser auf, durch den sich ein radialer Abstand zum Zylinder- röhr 1 ergibt, so dass ein Freiraum zur Aufnahme nicht-magnetisierbarer Führungs- und Dichtelemente 47 (siehe Fig. 2) gebildet ist. In ihrem von den Magnetkörpern 35 weiter entfernten Umfangsbereich 49 ist der Außendurchmesser der Ringkörper 29 und 31 an den Innendurchmesser des Zylinderrohres 1 angenähert. Bei dieser Konfiguration bilden die Ringkörper 29 und 31 Polschuhe für das Einleiten des magnetischen Flusses in dieAs can be seen from FIGS. 1 and 2, the ring bodies 29 and 31 in their circumferential area 45 adjoining the magnetic bodies 35 have an outer diameter which results in a radial distance from the cylinder tube 1, so that there is no free space for receiving them Magnetizable guide and sealing elements 47 (see FIG. 2) is formed. In its peripheral region 49, which is further away from the magnetic bodies 35, the outer diameter of the ring bodies 29 and 31 approximates the inner diameter of the cylinder tube 1. In this configuration, the ring bodies 29 and 31 form pole pieces for the introduction of the magnetic flux into the
Wand des Zylinderrohres 1 über die daran angenäherten Umfangsbereiche 49.Wall of the cylinder tube 1 over the peripheral regions 49 approximated thereto.
Wie aus Fig. 1 zu ersehen ist, sind an der Außenseite des Zylinderrohres 1 zwei Hall-Sensoren 51 angebracht, die auf Änderungen des Magnetfeldes ansprechen, wie sie sich ergeben, wenn sich der Kolben 3 mit der an ihm befindlichen Magnetanordnung längs seines Hubweges im Zylinderrohr 1 bewegt. Wie durch die in Fig. 1 mit 53 bezeichneten Anschlußkabel der Hall-Sensoren 51 verdeutlicht, sind diese am Zylinderrohr 1 in zueinander entgegengesetzter Orientierung angebracht, so dass eine Annäherung des Kolbens 3 an seine obere Endlage und an seine untere Endlage, was einer Verstärkung des Magnetfeldes mit jeweils verschiedener Polarität der Feldlinien am betreffenden Hall-Sensor 51 entspricht, jeweils zu einem positi- ven Signalanstieg der Hall-Spannung führt. Wie aus Fig. 1 ebenfalls zu ersehen ist, sind die Hall-Sensoren 51 in solchem axialen Abstand voneinander angeordnet, dass sich der eine Hall-Sensor 51 in dem Bereich befindet, in dem die Magnetkörper 35 bei der einen Endlage des Kolbens 3 gelegen sind, und der andere Hall-Sensor 51, zum anderen Ende des Zylinderrohres 1 hin versetzt, in einem Bereich angebracht ist, wo sich die Magnetkörper 35 des Kolbens 3 bei dessen anderer Endlage befinden.As can be seen from Fig. 1, two Hall sensors 51 are attached to the outside of the cylinder tube 1, which respond to changes in the magnetic field as they result when the piston 3 with the magnet arrangement located on it along its stroke in Cylinder tube 1 moves. As illustrated by the connecting cables of the Hall sensors 51 designated 53 in FIG. 1, these are on the cylinder tube 1 in relation to one another opposite orientation attached, so that an approach of the piston 3 to its upper end position and its lower end position, which corresponds to an amplification of the magnetic field with different polarity of the field lines at the Hall sensor 51 in question, each leads to a positive signal increase in the Hall Tension leads. As can also be seen from FIG. 1, the Hall sensors 51 are arranged at such an axial distance from one another that the one Hall sensor 51 is located in the area in which the magnetic bodies 35 are located at the one end position of the piston 3 , and the other Hall sensor 51, offset toward the other end of the cylinder tube 1, is attached in an area where the magnetic bodies 35 of the piston 3 are in its other end position.
Es versteht sich, dass die von den Hall-Sensoren 51 erzeugten, die Position des Kolbens 3 kennzeichnenden Hall-Spannungen auf beliebige geeignete Weise zur Gewinnung der Positionsanzeige des Kolbens 3 verarbeitet werden können. Durch die Einleitung des magnetischen Flusses der Magnetkörper 35 in die Wand des Zylinderrohres 1 über die als Polschuhe fungierenden Ringkörper 29 und 31 ergeben sich signifikante Signalwerte aufgrund des Hall-Effektes. Es versteht sich, dass die Einkoppelung des Flusses über die als Polschuh dienenden Ringkörper 29 und 31 lediglich so stark gewählt zu sein braucht, dass ausreichende Signalwerte erreicht werden. Um zu vermeiden, dass sich aufgrund des magnetischen Flusses stärkere, gegebenenfalls störende Magnetkrafteinflüsse zwischen der Magnetanordnung am Kolben 3 und dem Zylinderrohr 1 ergeben könnten, kann eine Entkoppelung auf für die Anzeigezwecke ausreichende Werte vorgesehen sein, indem beispielswe se ein geringer Luftspalt zwischen den Umfangsbe- reichen 49 und dem Zyl nderrohr 1 vorgesehen wird oder zwischen Um- fangsbereich 49 und Zyl nderrohr 1 ein dünnwandiges Kolbenführungsmittel nicht-magnetisierbaren Werkstoffes eingefügt wird. Bei einer geänderten Ausführungsform des erfindungsgemäßen Kolbenspeichers besteht auch die Möglichkeit, die Einsenkungen 33 wegzulassen und die beiden Ringkörper 29 und 31 sind dann an ihren einander zugewandten Seiten plan ausgebildet, wobei die zylindrisch ausgebildeten Magnetkörper 35 sich dann zwischen den beiden Planflächen der Ringkörper 29 und 31 mit radialen Abständen zueinander axial erstrecken. Die dahingehende Anordnung ist dem Grunde nach in Fig.3 in der Draufsicht wiedergegeben, sofern man anstelle der Einsenkungen 33 die Oberseite der zylindrischen Magnetkörper 35 annehmen würde.It goes without saying that the Hall voltages generated by the Hall sensors 51 and characterizing the position of the piston 3 can be processed in any suitable manner to obtain the position indicator of the piston 3. The introduction of the magnetic flux of the magnetic bodies 35 into the wall of the cylinder tube 1 via the ring bodies 29 and 31 functioning as pole shoes results in significant signal values due to the Hall effect. It goes without saying that the coupling of the flow via the ring bodies 29 and 31 serving as a pole shoe need only be selected to be so strong that sufficient signal values are achieved. In order to avoid that stronger, possibly disruptive magnetic force influences could arise between the magnet arrangement on the piston 3 and the cylinder tube 1 due to the magnetic flux, a decoupling to values sufficient for the display purposes can be provided, for example by a small air gap between the circumferential range 49 and the cylinder tube 1 is provided or a thin-walled piston guide means of non-magnetizable material is inserted between the peripheral region 49 and the cylinder tube 1. In a modified embodiment of the piston accumulator according to the invention, there is also the possibility of omitting the depressions 33 and the two annular bodies 29 and 31 are then formed flat on their mutually facing sides, the cylindrical magnetic bodies 35 then being located between the two flat surfaces of the annular bodies 29 and 31 extend axially with radial distances from each other. The arrangement in question is basically reproduced in a top view in FIG. 3, provided that the top of the cylindrical magnetic bodies 35 would be assumed instead of the depressions 33.
Anstelle der in der Fig.1 gezeigten beiden Hall-Sensoren 51 kann auch nur ein Hall-Sensor 51 zur Positionsüberwachung oder Bestimmung des Kolbens 3 vorgesehen sein. In Abhängigkeit der Aufgabenstellung können auch mehr als zwei Hall-Sensoren 51 die jeweilige Verfahrposition des Kolbens 3 überwachen und an eine entsprechende Auswerteelektronik weiterleiten. Demgemäß ist mit der erfindungsgemäßen Lösung auch eine Endlagenüberwachung des Kolbens 3 durch die beiden Hall-Sensoren 51 gemäß der Darstellung nach der Fig.1 möglich. Instead of the two Hall sensors 51 shown in FIG. 1, only one Hall sensor 51 can also be provided for position monitoring or determination of the piston 3. Depending on the task, more than two Hall sensors 51 can monitor the respective travel position of the piston 3 and forward them to a corresponding evaluation electronics. Accordingly, with the solution according to the invention, end position monitoring of the piston 3 by the two Hall sensors 51 as shown in FIG. 1 is also possible.

Claims

A n s p r ü c h e Expectations
1. Kolbenspeicher, der aufweist: a) ein Speichergehäuse in Form eines Zylinderrohres (1 ) aus magneti- sierbarem Werkstoff, das eine Axialrichtung des Gehäuses definiert, b) einen Kolben (3) , der im Zylinderrohr (1) über einen Hubweg axial bewegbar ist und ein bewegliches Trennelement bildet, das im Speichergehäuse zwei Arbeitsräume (7,9) voneinander trennt, c) eine am Kolben (3) angeordnete, ein Feld an der Wand des Zylinder- rohres (1 ) erzeugende Magnetanordnung (29,31 ,35) und d) eine an der Außenseite des Zylinderrohres (1) befindliche Magnetfeldsensoreinrichtung, die mindestens einen Hall-Sensor (51) aufweist, der an der Außenseite des Zylinderrohres (1) angeordnet ist und der auf das von der Magnetanordnung (29,31 ,35) am Kolben (3) erzeugte Feld anspricht, um die Position des Kolbens (3) entlang des1. Piston accumulator, which has: a) a accumulator housing in the form of a cylinder tube (1) made of magnetizable material which defines an axial direction of the housing, b) a piston (3) which can be moved axially in the cylinder tube (1) over a stroke and forms a movable separating element which separates two working spaces (7, 9) from one another in the storage housing, c) a magnet arrangement (29, 31, 35) arranged on the piston (3) and producing a field on the wall of the cylinder tube (1) ) and d) a magnetic field sensor device located on the outside of the cylinder tube (1), which has at least one Hall sensor (51), which is arranged on the outside of the cylinder tube (1) and which is connected to the magnet arrangement (29, 31, 35) on the piston (3) generated field responds to the position of the piston (3) along the
Hubweges zu ermitteln.To determine the stroke.
2. Kolbenspeicher nach Anspruch 1 , dadurch gekennzeichnet, dass zwei Hall-Sensoren (51 ) an der Außenseite des Zylinderrohres (1) in einem axialen Abstand voneinander angeordnet sind.2. Piston accumulator according to claim 1, characterized in that two Hall sensors (51) on the outside of the cylinder tube (1) are arranged at an axial distance from one another.
3. Kolbenspeicher nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Kolben (3) aus nicht-magnetisierbarem Werkstoff gebildet ist und dass die Magnetanordnung eine Mehrzahl von Dauermagneten (35) aufweist, die in einem radialen Abstand vom Umfang des Kolbens (3) in einer zur Längsachse (5) des Kolbens (3) konzentrischen Reihe mit zueinander gleicher Polarität so angeordnet sind, dass sich ihre Polachsen parallel zur Längsachse (5) erstrecken. 3. Piston accumulator according to claim 1 or 2, characterized in that the piston (3) is formed from non-magnetizable material and that the magnet arrangement has a plurality of permanent magnets (35) which are at a radial distance from the circumference of the piston (3) are arranged in a row concentric to the longitudinal axis (5) of the piston (3) with mutually identical polarity such that their polar axes extend parallel to the longitudinal axis (5).
. Kolbenspeicher nach Anspruch 3, dadurch gekennzeichnet, dass die Reihe der Dauermagnete aus kreiszylindrischen Magnetkörpern (35) mit entlang ihrer Zylinderachse verlaufender Polachse gebildet ist, die in gleichen Winkelabständen voneinander um den Umfang des Kolbens (3) verteilt angeordnet sind., Piston accumulator according to claim 3, characterized in that the row of permanent magnets is formed from circular-cylindrical magnetic bodies (35) with a pole axis running along their cylinder axis, which are arranged at equal angular intervals from one another around the circumference of the piston (3).
5. Kolbenspeicher nach Anspruch 4, dadurch gekennzeichnet, dass die Magnetkörper (35) zwischen an ihren Polendflächen anliegenden Ringkörpern (29,31) aus magnetisierbarem Werkstoff gehalten sind, die den Kolben (3) in einem Umfangsabschnitt (21) umgeben, der einen geringeren Durchmesser besitzt als der an der Innenwand des Zylinderrohres (1) geführte Umfangsabschnitt (23).5. Piston accumulator according to claim 4, characterized in that the magnetic bodies (35) are held between ring bodies (29, 31) which bear against their pole end faces and are made of magnetizable material and surround the piston (3) in a circumferential section (21) which is less Diameter has than the circumferential section (23) guided on the inner wall of the cylinder tube (1).
6. Kolbenspeicher nach Anspruch 5, dadurch gekennzeichnet, dass die Ringkörper (29,31) in ihrem an die Magnetkörper (35) angrenzenden6. Piston accumulator according to claim 5, characterized in that the ring body (29,31) in its adjacent to the magnetic body (35)
Umfangsbereich (45) einen einen radialen Abstand zum Zylinderrohr (1) bildenden Außendurchmesser und im von den Magnetkörpern (35) weiter entfernten Umfangsbereich (49) einen an das Zylinderrohr (1 ) angenäherten Außendurchmesser aufweisen, mit dem die Ringkörper (29,31 ) Polschuhe zum Einleiten magnetischen Flusses in die Wand des Zylinderrohres (1) bilden.The circumferential area (45) has an outer diameter forming a radial distance from the cylinder tube (1) and, in the circumferential area (49) further away from the magnetic bodies (35), has an outer diameter approximated to the cylinder tube (1) with which the annular bodies (29, 31) have pole pieces form for introducing magnetic flux into the wall of the cylinder tube (1).
7. Kolbenspeicher nach Anspruch 6, dadurch gekennzeichnet, dass der Kolben (3) am Übergang zwischen dem am Zylinderrohr (1) geführten Umfangsabschnitt (23) und dem im Durchmesser demgegenüber verringerten Umfangsabschnitt (21) eine eine Radialebene definierende Schulterfläche (43) als Anlagefläche für ein Dichtelement (41) bildet, an dessen der Schulterfläche (43) gegenüberliegender Seite der benachbarte Ringkörper (31) anliegt. 7. Piston accumulator according to claim 6, characterized in that the piston (3) at the transition between the circumferential section (23) guided on the cylinder tube (1) and the circumferential section (21) which is reduced in diameter in comparison thereto, has a shoulder surface (43) defining a radial plane as a contact surface for a sealing element (41), on the side of the shoulder surface (43) opposite the adjacent ring body (31).
8. Kolbenspeicher nach Anspruch 7, dadurch gekennzeichnet, dass die Ringkörper (29,31) durch einen Schraubring (37) zusammen- und an dem Dichtelement (41) in Anlage gehalten sind, der auf ein Außenge- winde (39) am Ende des im Durchmesser verringerten Umfangsabschnit- tes (21) des Kolbens (3) aufgeschraubt ist.8. Piston accumulator according to claim 7, characterized in that the ring bodies (29, 31) are held together by a screw ring (37) and held in contact with the sealing element (41) which is connected to an external thread (39) at the end of the circumferential section (21) of the piston (3) with reduced diameter is screwed on.
9. Kolbenspeicher nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass die Hall-Sensoren (51) am Zylinderrohr (1) in Axialstel- lungen angeordnet sind, die einer vorgebbaren Position des Kolbens (3) bzw. der anderen vorgebbaren Position des Kolbens (3) bei dessen Bewegung über den gesamten Hubweg entsprechen.9. Piston accumulator according to one of claims 1 to 8, characterized in that the Hall sensors (51) on the cylinder tube (1) are arranged in axial positions which correspond to a predeterminable position of the piston (3) or the other predeterminable position of the Correspond to the piston (3) as it moves over the entire stroke.
10. Kolbenspeicher nach Anspruch 9, dadurch gekennzeichnet, dass die jeweils vorgebbare Position den möglichen Endlagen des Kolbens (3) entspricht. 10. Piston accumulator according to claim 9, characterized in that the position which can be predetermined in each case corresponds to the possible end positions of the piston (3).
EP04703100A 2003-03-11 2004-01-17 Piston-type accumulator Expired - Lifetime EP1601878B1 (en)

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DE10310428A DE10310428A1 (en) 2003-03-11 2003-03-11 piston accumulators
PCT/EP2004/000335 WO2004081388A1 (en) 2003-03-11 2004-01-17 Piston-type accumulator

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ATE363601T1 (en) 2007-06-15
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WO2004081388A1 (en) 2004-09-23
DE502004003962D1 (en) 2007-07-12
US20060075892A1 (en) 2006-04-13
DE10310428A1 (en) 2004-09-30

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