EP1478858B1 - Piston-type accumulator - Google Patents

Piston-type accumulator Download PDF

Info

Publication number
EP1478858B1
EP1478858B1 EP02760250A EP02760250A EP1478858B1 EP 1478858 B1 EP1478858 B1 EP 1478858B1 EP 02760250 A EP02760250 A EP 02760250A EP 02760250 A EP02760250 A EP 02760250A EP 1478858 B1 EP1478858 B1 EP 1478858B1
Authority
EP
European Patent Office
Prior art keywords
piston
store
sealing
venting
separating piston
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
EP02760250A
Other languages
German (de)
French (fr)
Other versions
EP1478858A2 (en
Inventor
Norbert Weber
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 EP1478858A2 publication Critical patent/EP1478858A2/en
Application granted granted Critical
Publication of EP1478858B1 publication Critical patent/EP1478858B1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

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
    • F15B2201/30—Accumulator separating means
    • F15B2201/32—Accumulator separating means having multiple separating means, e.g. with an auxiliary piston sliding within a main piston, multiple membranes or combinations thereof

Definitions

  • the invention relates to a piston accumulator with the features of the preamble of claim 1.
  • Piston accumulators are known in a variety of designs.
  • the part surrounding the separating piston and axially leading part of the storage housing generally has the shape of a cylinder tube, which is why the piston accumulators are often referred to as cylinder storage.
  • the sealing areas on the circumference of the separating piston are usually formed by ring or O-ring seals, which are embedded in axially offset from each other outer circumferential grooves in the separating piston.
  • the annular body is formed of a material of predeterminable gas permeability, which has web-like projections to the outer peripheral side of the storage housing, with which the annular body is supported on the storage housing.
  • the annular body tapers at the pertinent point conical and in the pertinent rejuvenation point is a check valve is used, which opens at a predeterminable pressure at the point of venting and thus a vent for the piston accumulator for discharging the sealing areas overcoming leak media causes so far in the known solution, the duration of use times is extended.
  • the outwardly projecting check valve is sensitive to externally initiated mechanical shocks and other sudden stresses, so that when using the known solution under extreme conditions, the ventilation function may be impaired to malfunction.
  • the present invention seeks to provide a piston accumulator that retains its tightness even under extreme conditions and long periods of use and ensures that can reach the fluid side in any operating condition gas.
  • this object is achieved in that the annular body has an equidistant to the outside of the cylinder tube annular surface, which by both sides of this subsequent, radially inwardly projecting edge strips in a clear width of the collection chamber defining distance from Cylinder tube is held, and that is provided as a valve arrangement of the outlet, a circumferential surface surrounding the bore and covering elastic band.
  • the collection chamber has as an outlet into the open on a hole which is opened or closed by means of a valve assembly.
  • this is an elastic band which wraps around the annular surface of the annular body.
  • the bias voltage with which the band rests on the annular surface is selected such that the band lifts off from the bore at a predetermined overpressure in the collection chamber in order to deliver media located in the collection chamber to the environment.
  • the piston accumulator according to the invention is particularly suitable for applications in which safety requirements are to be met, in particular for brake systems, because here the prevention of transgressions of gas molecules to the fluid side is of crucial importance.
  • a vent hole formed in the wall of the storage housing may be provided.
  • the outlet end of the vent hole is in communication with a collection chamber for receiving the leak media.
  • Leak media are released by the filling of the collection chamber to the environment.
  • the arrangement may in this case be such that the outlet of the collecting chamber permitting venting to the outside has a normally closed valve arrangement which opens by the pressure prevailing in the collecting chamber, so that an automatic discharge takes place when a preselected overpressure is established after complete filling of the collecting chamber ,
  • a "super-tight" piston accumulator can be provided in addition to the sealing areas between which the venting possibility, on the separating piston even closer to the gas side, additional third sealing area. Since it is not possible to transfer leakage components from the fluid side, the piston seal forming the third sealing region would, and normally also the the second sealing area forming piston seal, run dry.
  • a supply device for the supply of a flowable lubricant to the located between the second and third sealing portion peripheral portion of the separating piston is provided.
  • This may be a highly viscous oil, for example a mineral oil, or a flowable fat.
  • FIGURE shows a schematically simplified longitudinal section of the embodiment of the piston accumulator.
  • the piston accumulator shown in the figure has a designated as a whole with 1 storage enclosure with a cylinder tube 3, which is closed at one end by an integrally formed with the cylinder tube 3 end wall 5 and at the opposite end by a closure cover 7.
  • the closure lid 7 is secured by a snap ring 9 on the cylinder tube 3 and sealed by means of an O-ring 11 on the inner wall of the cylinder tube 3.
  • the closure lid 7 could be welded to the cylinder tube 3.
  • a separating piston 13 is axially displaceable, which is sealed with respect to the finely-machined inner wall of the cylinder tube 3 by means of three, axially offset piston seals, the first, form a second and a third sealing area on the circumference of the separating piston 13.
  • the piston seals are in each case seated in circumferential grooves of the separating piston 13 sealing rings, wherein the fluid side 15 of the piston accumulator closest sealing ring 17 forms the first sealing region.
  • a provided in the cap 7 passage 19 with a connecting piece 21 provides the connection to an associated hydraulic system (not shown) ago.
  • a second sealing ring 20 seated in a circumferential groove of the annular piston 13 is provided as the second sealing region.
  • An even further toward the gas side 23 out offset third sealing region is formed by a third, seated in a circumferential groove of the separating piston 13 sealing ring 27.
  • the stroke of the separating piston 13 within the cylinder tube 3 is limited by not shown in the drawing stops in the cylinder tube 3 mechanically to a desired working stroke length or alternatively by controlling the pressure conditions of fluid side 15 and gas side 23, the gas filling pressure via a filling port 29 adjustable is.
  • a vent hole 31st formed continuously in the wall of the cylinder tube 3.
  • annular groove-like recess 33 with bevelled Side edges 35 incorporated in the region of the inner mouth of the vent hole 31 .
  • the recess 33 also prevents shearing of the seals 25 and 27 during assembly, when they are pushed over the bore 31.
  • an inner chamber communicating with the venting bore 31 is formed on the circumference of the separating piston 13, into which leakage media can enter if creeping of liquid molecules should take place through the sealing ring 17 or Sealing rings 27 and 25 should be overcome by the small gas molecules of the filling gas on the gas side 23.
  • Such eventual leak media pass through the vent hole 31 into a collection chamber 39 into which the outer end of the vent hole 31 opens.
  • This collection chamber 39 is formed in the embodiment shown by a seated on the outside of the cylinder tube 3 ring body 41.
  • This is a molded plastic or sheet metal integrally formed profile body with a flat outer annular surface 43 which is laterally bordered by its perpendicular to extending edge strips 45, abut the free ends on the outside of the cylinder tube 3, so that the annular surface 43 equidistant at a distance is held by the outside of the cylinder tube 3.
  • O-rings 47 the edge strips 45 are sealed relative to the outside of the cylinder tube 3.
  • the collection chamber 39 thus formed has as an outlet to the outside a bore 49 which is opened or closed by means of a valve arrangement.
  • This is an elastic band 51, which wraps around the annular surface 43 of the annular body 41. The bias voltage with which the band 51 rests on the annular surface 43 is selected so that the band 51 lifts at a predetermined overpressure in the collection chamber 39 from the bore 49 to deliver located in the collection chamber media to the environment.
  • the bore 49 forming the outlet is shown on the side of the cylinder tube 3 at the top in the drawing.
  • the annular body 41 is rotatable on the cylinder tube 3 to allow the bore 49 to be set to the highest point.
  • the ends of the edge strips 45 may be formed as with the cylinder tube 3 directly cooperating sealing edges.
  • a bore containing a porous, plug-like insert could be provided, for example using a plug made of a porous sintered material.
  • annular groove 53 is incorporated into the periphery of the separating piston 13, which is provided with a supply device for supplying a flowable lubricant in the separating piston 13 communicates.
  • the separating piston 13 has for this purpose an inner, concentric auxiliary cylinder 55 which is closed to the fluid side 15 and open towards the gas side 23. From the gas side 23 forth in the auxiliary cylinder 55, an auxiliary piston 57 is inserted, which has a circumferential piston seal 59 and is secured against escaping from the auxiliary cylinder 55 by a snap ring 61.
  • the volume between the auxiliary piston 57 and the closed end of the auxiliary cylinder 55 is filled with a supply of a flowable lubricant.
  • a connection channel 63 in the separating piston 13 connects this lubricant reservoir with the annular groove 53 on the circumference of the separating piston 13.
  • the auxiliary piston 57 is spring-loaded by a helical compression spring 65, which is supported on a holding plate 69 which is fixed on the separating piston 13 by means of a snap ring 67.
  • a helical compression spring 65 which is supported on a holding plate 69 which is fixed on the separating piston 13 by means of a snap ring 67.
  • a bush-like stopper body 70 which prevents the seal 17 slips into the groove 33, if the separating piston 13 in a high position (not shown) back should.
  • the pertinent stop body 70 is flush with its outer periphery on the inner circumference of the storage housing 1 and extends otherwise between the end wall 5 and the one free end of the separating piston 13, provided that, as shown in the figure, stops against the stop body 70. Otherwise, the stopper body 70 is fixed by its internal stress in the interior of the storage housing 1 in its position shown.
  • the stopper body 70 may also be a Vorkragung or other stop means on the inside of the storage enclosure 1, wherein the arrangement is clearly chosen so that the sealant 17 can not enter the groove 33 during operation of the device.

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)

Description

Die Erfindung betrifft einen Kolbenspeicher mit den Merkmalen des Oberbegriffes des Patentanspruches 1.The invention relates to a piston accumulator with the features of the preamble of claim 1.

Kolbenspeicher sind in einer Vielzahl von Bauarten bekannt. Der den Trennkolben umgebende und axial führende Teil des Speichergehäuses hat im allgemeinen die Form eines Zylinderrohres, weshalb die Kolbenspeicher auch oft als Zylinderspeicher bezeichnet sind. Die Abdichtungsbereiche am Umfang des Trennkolbens sind üblicherweise durch Ring- oder O-Ring-Dichtungen gebildet, die in axial zueinander versetzten Außenumfangsnuten im Trennkolben eingelassen sind.Piston accumulators are known in a variety of designs. The part surrounding the separating piston and axially leading part of the storage housing generally has the shape of a cylinder tube, which is why the piston accumulators are often referred to as cylinder storage. The sealing areas on the circumference of the separating piston are usually formed by ring or O-ring seals, which are embedded in axially offset from each other outer circumferential grooves in the separating piston.

Für den Einsatz derartiger Zylinder- oder Kolbenspeicher werden hinsichtlich ihrer Funktionstüchtigkeit sehr hohe Anforderungen gestellt, und zwar über weite Temperaturbereiche, beispielsweise zwischen -40°C bis + 150°C. Es hat sich nun in Prüfstandsversuchen gezeigt, daß solche Speicher hinsichtlich des Langzeitverhaltens nicht zufriedenstellend funktionieren, da bei den bekannten Speichern häufig Gas zur Öl- oder Fluidseite hin übertritt. Bei Speichern, die eine Sicherheitsfunktion zu erfüllen haben, ist dies nicht hinnehmbar, insbesondere, wenn es sich um Speicher in Verbindung mit hydraulischen Bremssystemen handelt, wo ein Übertritt von Gas in das Hydrauliksystem zu Fehlfunktion bis hin zu einem Versagen führen könnte.For the use of such cylinder or piston accumulator very high demands are made in terms of their functionality, and over wide temperature ranges, for example, between -40 ° C to + 150 ° C. It has now been shown in test bench tests that such memory with respect to the long-term behavior does not work satisfactorily, as in the known storage often gas to oil or fluid side over passes. This is unacceptable in memories which have to fulfill a safety function, in particular when it comes to accumulators in connection with hydraulic brake systems, where a transfer of gas into the hydraulic system could lead to malfunction or failure.

Durch PATENT ABSTRACTS OF JAPAN vol. 2000, no. 10, 17. November 2000 (2000-11-17) & JP 2000 186701 A (AISIN SEIKI CO LTD). 4. Juli 2000 (2000-07-04) ist ein gattungsgemäßer Kolbenspeicher bekannt mit einem innerhalb eines Speichergehäuses axial verfahrbaren Trennkolben, der eine Fluidseite des Speichers von seiner Gasseite trennt und an seinem, an der Innenwand des Speichergehäuses geführten Umfang zwei in Axialrichtung zueinander versetzte Abdichtungsbereiche aufweist, wobei

  • das Speichergehäuse an einer zwischen den Abdichtungsbereichen des Trennkolbens gelegenen Stelle eine Entlüftungsmöglichkeit zur Ableitung von Abdichtungsbereiche überwindenden Leckmedien aufweist,
  • als Enlüftungsmöglichkeit eine in de Wand des Speichergehäuses durchgehend ausgebildete Entlüftungsbohrung vorgesehen ist,
  • das Austrittsende der Entlüftungsbohrung mit einer Sammelkammer für die Aufnahme der Leckmedien in Verbindung steht,
  • die Sammelkammer einen eine Entlüftung ins Freie ermöglichenden Auslaß aufweist,
  • der Auslaß eine durch den in der Sammelkammer herrschenden Druck öffenbare, normalerweise geschlossene Ventilanordnung aufweist,
  • die Sammelkammer durch einen auf der Außenseite eines den Trennkolben aufnehmenden Zylinderrohres des Speichergehäuses sitzenden Ringkörper gebildet ist, der eine den Auslaß bildende Bohrung aufweist.
By PATENT ABSTRACTS OF JAPAN vol. 2000, no. 10, November 17, 2000 (2000-11-17) & JP 2000 186701 A (AISIN SEIKI CO LTD). July 4, 2000 (2000-07-04) is a generic piston accumulator known with a axially movable within a storage housing separating piston, which separates a fluid side of the memory from its gas side and offset at its, guided on the inner wall of the storage enclosure perimeter in the axial direction to each other Has sealing areas, wherein
  • the storage housing at a location located between the sealing areas of the separating piston has a venting possibility for the discharge of sealing areas overcoming leakage media,
  • as ventilation option is provided in the wall of the storage housing continuously formed vent hole,
  • the outlet end of the vent hole communicates with a collection chamber for receiving the leak media,
  • the collecting chamber has an outlet allowing venting to the outside,
  • the outlet has a normally open valve arrangement openable by the pressure prevailing in the collecting chamber,
  • the collecting chamber is formed by a ring body seated on the outside of a cylinder tube of the storage housing receiving the separating piston and having a bore forming the outlet.

Bei der bekannten Lösung ist der Ringkörper aus einem Material vorgebbarer Gas - Permeabilität gebildet, der zur Außenumfangsseite des Speichergehäuses stegartige Vorsprünge aufweist, mit denen sich der Ringkörper an dem Speichergehäuse abstützt. Gegenüberliegend zu der Entlüftungsmöglichkeit des Speichergehäuses verjüngt sich der Ringkörper an der dahingehenden Stelle konisch und in die dahingehende Verjüngungsstelle ist ein Rückschlagventil eingesetzt, das bei einem vorgebbaren Überdruck an der Stelle der Entlüftungsmöglichkeit öffnet und dergestalt eine Entlüftung für den Kolbenspeicher zur Ableitung von die Abdichtungsbereiche überwindenden Leckmedien bewirkt, so dass insoweit bei der bekannten Lösung die Dauer der Einsatzzeiten verlängert ist. Das nach außen hin vorstehende Rückschlagventil ist jedoch empfindlich gegenüber von außen eingeleiteten mechanischen Stößen und sonstigen schlagartigen Beanspruchungen, so dass bei Einsatz der bekannten Lösung unter Extrembedingungen die Entlüftungsfunktion bis zur Fehlfunktion beeinträchtigt sein kann.In the known solution, the annular body is formed of a material of predeterminable gas permeability, which has web-like projections to the outer peripheral side of the storage housing, with which the annular body is supported on the storage housing. Opposite to the venting possibility of the storage housing, the annular body tapers at the pertinent point conical and in the pertinent rejuvenation point is a check valve is used, which opens at a predeterminable pressure at the point of venting and thus a vent for the piston accumulator for discharging the sealing areas overcoming leak media causes so far in the known solution, the duration of use times is extended. However, the outwardly projecting check valve is sensitive to externally initiated mechanical shocks and other sudden stresses, so that when using the known solution under extreme conditions, the ventilation function may be impaired to malfunction.

Ausgehend von diesem Stand der Technik liegt der Erfindung die Aufgabe zugrunde, einen Kolbenspeicher zu schaffen, der auch unter Extrembedingungen und bei langen Einsatzzeiten seine Dichtigkeit behält und sicherstellt, dass in keinem Betriebszustand Gas zur Fluidseite hin gelangen kann.Based on this prior art, the present invention seeks to provide a piston accumulator that retains its tightness even under extreme conditions and long periods of use and ensures that can reach the fluid side in any operating condition gas.

Bei einem Kolbenspeicher der eingangs genannten Art ist diese Aufgabe erfindungsgemäß dadurch gelöst, dass der Ringkörper eine äquidistant zur Außenseite des Zylinderrohres verlaufende Ringfläche aufweist, die durch sich beidseits an diese anschließende, radial nach innen vorspringende Randleisten in einem die lichte Weite der Sammelkammer definierenden Abstand vom Zylinderrohr gehalten ist, und dass als Ventilanordnung des Auslasses ein die Ringfläche umgehendes und die Bohrung überdeckendes elastisches Band vorgesehen ist.In a piston accumulator of the type mentioned, this object is achieved in that the annular body has an equidistant to the outside of the cylinder tube annular surface, which by both sides of this subsequent, radially inwardly projecting edge strips in a clear width of the collection chamber defining distance from Cylinder tube is held, and that is provided as a valve arrangement of the outlet, a circumferential surface surrounding the bore and covering elastic band.

Die Sammelkammer weist als Auslaß ins Freie eine Bohrung auf, die mittels einer Ventilanordnung geöffnet oder verschlossen wird. Hierbei handelt es sich erfindungsgemäß um ein elastisches Band, das die Ringfläche des Ringkörpers umschlingt. Die Vorspannung, mit der das Band auf der Ringfläche aufliegt, ist derart gewählt, dass das Band bei einem vorbestimmten Überdruck in der Sammelkammer von der Bohrung abhebt, um in der Sammelkammer befindliche Medien an die Umgebung abzugeben. Mit der erfindungsgemäßen Lösung ist es ermöglicht, bei beliebigem Einbau des Kolbenspeichers die Entlüftungsmöglichkeit nach oben zu führen, da der Ringkörper vorzugsweise auf dem Zylinderrohr drehbar gehalten ist, um zu ermöglichen, dass die Bohrung auf die höchstgelegene Stelle einstellbar ist.The collection chamber has as an outlet into the open on a hole which is opened or closed by means of a valve assembly. According to the invention, this is an elastic band which wraps around the annular surface of the annular body. The bias voltage with which the band rests on the annular surface is selected such that the band lifts off from the bore at a predetermined overpressure in the collection chamber in order to deliver media located in the collection chamber to the environment. With the solution according to the invention it is possible, with any installation of the piston accumulator to lead the venting possibility upwards, since the annular body is preferably rotatably supported on the cylinder tube, to allow the bore to the highest point is adjustable.

Dank der zwischen gasseitigem und fluidseitigem Abdichtungsbereich gelegenen Entlüftungsmöglichkeit ist sichergestellt, daß kein Übertritt von Medien von der Gasseite zur Fluidseite oder umgekehrt erfolgen kann, selbst wenn Moleküle der an den Trennkolben angrenzenden Medien durch das ansonsten dichte Dichtungssystem am Umfang des Trennkolbens kriechen. Wegen der kleinen Moleküle des auf der Gasseite befindlichen Mediums, in den meisten Fällen Stickstoff, ist ein gewisses Kriechen durch am Trennkolben vorgesehene Dichtringe auch dann nicht gänzlich ausgeschlossen, wenn die Oberfläche auf der Innenseite des Zylinderrohres des Speichergehäuses feinstbearbeitet ist, weil bei dem Betrieb der Kolbenspeicher grundsätzlich die Forderung besteht, daß die Reibung zwischen Kolbendichtung und Innenseite des Zylinderrohres während der Kolbenbewegung sehr klein ist, was keine hohe Flächenpressung erlaubt. Auch gegebenenfalls von der Fluidseite her über die Kolbendichtung übergetretene Leckmengen, beispielsweise von Hydrauliköl, können aufgrund der Entlüftungsmöglichkeit nicht zur Gasseite übertreten.Thanks to the venting possibility located between the gas-side and the fluid-side sealing region, it is ensured that no media can pass from the gas side to the fluid side or vice versa, even if molecules of the media adjacent to the separating piston creep through the otherwise sealed sealing system on the circumference of the separating piston. Because of the small molecules of the medium located on the gas side, in most cases nitrogen, a certain creeping is not completely excluded by sealing rings provided on the separating piston when the surface on the inside of the cylinder tube of the storage housing is finely worked, because in the operation of Piston accumulator basically there is a requirement that the friction between the piston seal and the inside of the cylinder tube during the piston movement is very small is what does not allow high surface pressure. Also optionally leaked from the fluid side via the piston seal leakage quantities, such as hydraulic oil, can not pass to the gas side due to the venting possibility.

Der erfindungsgemäße Kolbenspeicher eignet sich insbesondere für Anwendungsfälle, bei denen Sicherheitsanforderungen zu erfüllen sind, insbesondere für Bremssysteme, weil hier die Verhinderung von Übertritten von Gasmolekülen zur Fluidseite von ausschlaggebender Bedeutung ist.The piston accumulator according to the invention is particularly suitable for applications in which safety requirements are to be met, in particular for brake systems, because here the prevention of transgressions of gas molecules to the fluid side is of crucial importance.

Als Entlüftungsmöglichkeit kann eine in der Wand des Speichergehäuses durchgehend ausgebildete Entlüftungsbohrung vorgesehen sein.As ventilation option, a vent hole formed in the wall of the storage housing may be provided.

Bei einem vorteilhaften Ausführungsbeispiel ist das Austrittsende der Entlüftungsbohrung mit einer Sammelkammer für die Aufnahme der Leckmedien in Verbindung. Leckmedien werden dadurch erst nach erfolgter Füllung der Sammelkammer an die Umgebung abgegeben. Die Anordnung kann hierbei so getroffen sein, daß der eine Entlüftung ins Freie ermöglichende Auslaß der Sammelkammer eine normalerweise geschlossene Ventilanordnung aufweist, die durch den in der Sammelkammer herrschenden Druck öffnet, so daß eine selbsttätige Ableitung bei Aufbau eines vorgewählten Überdrucks nach vollständiger Füllung der Sammelkammer erfolgt.In an advantageous embodiment, the outlet end of the vent hole is in communication with a collection chamber for receiving the leak media. Leak media are released by the filling of the collection chamber to the environment. The arrangement may in this case be such that the outlet of the collecting chamber permitting venting to the outside has a normally closed valve arrangement which opens by the pressure prevailing in the collecting chamber, so that an automatic discharge takes place when a preselected overpressure is established after complete filling of the collecting chamber ,

Bei einer Ausführungsform als "superdichter" Kolbenspeicher kann außer den Abdichtungsbereichen, zwischen denen sich die Entlüftungsmöglichkeit befindet, am Trennkolben ein der Gasseite noch näher gelegener, zusätzlicher dritter Abdichtungsbereich vorgesehen sein. Da kein Übertritt von Leckbestandteilen von der Fluidseite her möglich ist, würde die den dritten Abdichtungsbereich bildende Kolbendichtung, und normalerweise auch die den zweiten Abdichtungsbereich bildende Kolbendichtung, trocken laufen. Bei einem vorteilhaften Ausführungsbeispiel der Erfindung ist im Hinblick hierauf im Trennkolben eine Versorgungseinrichtung für die Zufuhr eines fließfähigen Schmierstoffes zu dem zwischen zweitem und drittem Abdichtungsbereich gelegenen Umfangsabschnitt des Trennkolbens vorgesehen. Hierbei kann es sich um ein hochviskoses Öl, beispielsweise ein Mineralöl, oder ein fließfähiges Fett handeln. Neben der dadurch erreichten Schmierung, wodurch die Kolbenreibung reduziert und die Lebensdauer erhöht wird, ergibt sich wegen der hohen Viskosität des zugeführten Stoffes eine zusätzliche Sperr- oder Abdichtungswirkung.In one embodiment as a "super-tight" piston accumulator can be provided in addition to the sealing areas between which the venting possibility, on the separating piston even closer to the gas side, additional third sealing area. Since it is not possible to transfer leakage components from the fluid side, the piston seal forming the third sealing region would, and normally also the the second sealing area forming piston seal, run dry. In an advantageous embodiment of the invention with regard to this in the separating piston, a supply device for the supply of a flowable lubricant to the located between the second and third sealing portion peripheral portion of the separating piston is provided. This may be a highly viscous oil, for example a mineral oil, or a flowable fat. In addition to the achieved lubrication, whereby the piston friction is reduced and the life is increased, resulting in an additional blocking or sealing effect due to the high viscosity of the supplied material.

Nachstehend ist die Erfindung anhand eines in der Zeichnung dargestellten Ausführungsbeispiels im einzelnen erläutert. Die einzige Figur zeigt einen schematisch vereinfachten Längsschnitt des Ausführungsbeispiels des Kolbenspeichers.The invention with reference to an embodiment shown in the drawing is explained in detail. The single FIGURE shows a schematically simplified longitudinal section of the embodiment of the piston accumulator.

Der in der Figur dargestellte Kolbenspeicher weist ein als Ganzes mit 1 bezeichnetes Speichergehäuse mit einem Zylinderrohr 3 auf, das am einen Ende durch eine einstückig mit dem Zylinderohr 3 geformte Endwand 5 und am entgegengesetzten Ende durch einen Verschlußdeckel 7 abgeschlossen ist. Beim gezeigten Beispiel ist der Verschlußdeckel 7 durch einen Sprengring 9 am Zylinderrohr 3 gesichert und mittels eines O-Ringes 11 an der Innenwand des Zylinderrohres 3 abgedichtet. Anstelle der Verwendung eines Sprengringes 9 könnte der Verschlußdeckel 7 mit dem Zylinderrohr 3 verschweißt sein.The piston accumulator shown in the figure has a designated as a whole with 1 storage enclosure with a cylinder tube 3, which is closed at one end by an integrally formed with the cylinder tube 3 end wall 5 and at the opposite end by a closure cover 7. In the example shown, the closure lid 7 is secured by a snap ring 9 on the cylinder tube 3 and sealed by means of an O-ring 11 on the inner wall of the cylinder tube 3. Instead of using a snap ring 9, the closure lid 7 could be welded to the cylinder tube 3.

Im Zylinderrohr 3 ist ein Trennkolben 13 axial verschiebbar, der gegenüber der feinstbearbeiteten Innenwand des Zylinderrohres 3 mittels dreier, axial zueinander versetzter Kolbendichtungen abgedichtet ist, die einen ersten, einen zweiten und einen dritten Abdichtungsbereich am Umfang des Trennkolbens 13 bilden. Bei den Kolbendichtungen handelt es sich jeweils um in Umfangsnuten des Trennkolbens 13 sitzende Dichtringe, wobei der der Fluidseite 15 des Kolbenspeichers nächstgelegene Dichtring 17 den ersten Abdichtungsbereich bildet. Ein im Verschlußdeckel 7 vorgesehener Durchgang 19 mit einem Anschlußstutzen 21 stellt die Verbindung zu einem zugeordneten Hydrauliksystem (nicht gezeigt) her.In the cylinder tube 3, a separating piston 13 is axially displaceable, which is sealed with respect to the finely-machined inner wall of the cylinder tube 3 by means of three, axially offset piston seals, the first, form a second and a third sealing area on the circumference of the separating piston 13. The piston seals are in each case seated in circumferential grooves of the separating piston 13 sealing rings, wherein the fluid side 15 of the piston accumulator closest sealing ring 17 forms the first sealing region. A provided in the cap 7 passage 19 with a connecting piece 21 provides the connection to an associated hydraulic system (not shown) ago.

Gegenüber dem den ersten Abdichtungsbereich bildenden Dichtring 17 axial gegen die an die andere Kolbenseite angrenzende Gasseite 23 hin versetzt, ist als zweiter Abdichtungsbereich ein zweiter, in einer Umfangsnut des Ringkolbens 13 sitzender Dichtring 25 vorgesehen. Ein noch weiter in Richtung auf die Gasseite 23 hin versetzter dritter Abdichtungsbereich ist durch einen dritten, in einer Umfangsnut des Trennkolbens 13 sitzenden Dichtring 27 gebildet.Relative to the sealing ring 17 forming the first sealing region, axially offset against the gas side 23 adjoining the other piston side, a second sealing ring 20 seated in a circumferential groove of the annular piston 13 is provided as the second sealing region. An even further toward the gas side 23 out offset third sealing region is formed by a third, seated in a circumferential groove of the separating piston 13 sealing ring 27.

Der Hubweg des Trennkolbens 13 innerhalb des Zylinderrohres 3 wird durch in der Zeichnung nicht dargestellte Anschläge im Zylinderrohr 3 mechanisch auf eine gewünschte Arbeits-Hublänge begrenzt oder alternativ mittels Steuerung der Druckverhältnisse von Fluidseite 15 und Gasseite 23, deren Gas-Fülldruck über einen Füllanschluß 29 einstellbar ist. In dem Bereich des Zylinderrohres 3, der über die gesamte Arbeits-Hublänge des Trennkolbens 13 zwischen erstem und zweitem Abdichtungsbereich, d.h. zwischen dem Dichtring 17 und dem Dichtring 25, gelegen ist, ist als Entlüftungsmöglichkeit, die eine Ableitung von Leckmedien gestattet, eine Entlüftungsbohrung 31 in der Wand des Zylinderrohres 3 durchgehend ausgebildet. Im Bereich der inneren Mündung der Entlüftungsbohrung 31 ist in die Innenwand des Zylinderrohres 3 eine sich über den gesamten Umfang der Innenwand erstreckende, ringnutartige Ausnehmung 33 mit abgeschrägten Seitenrändern 35 eingearbeitet. Die Ausnehmung 33 verhindert auch ein Abscheren der Dichtungen 25 und 27 bei der Montage, wenn diese über die Bohrung 31 geschoben werden. Zusammen mit einer in den Umfang des Trennkolbens 13 eingearbeiteten Vertiefung 37 wird am Umfang des Trennkolbens 13 eine innere, mit der Entlüftungsbohrung 31 in Verbindung stehende Kammer gebildet, in die Leckmedien eintreten können, falls ein Kriechen von Flüssigkeitsmolekülen durch den Dichtring 17 stattfinden sollte oder die Dichtringe 27 und 25 durch die kleinen Gasmoleküle des Füllgases auf der Gasseite 23 überwunden werden sollten. Solche etwaigen Leckmedien gelangen durch die Entlüftungsbohrung 31 hindurch in eine Sammelkammer 39, in die das äußere Ende der Entlüftungsbohrung 31 mündet.The stroke of the separating piston 13 within the cylinder tube 3 is limited by not shown in the drawing stops in the cylinder tube 3 mechanically to a desired working stroke length or alternatively by controlling the pressure conditions of fluid side 15 and gas side 23, the gas filling pressure via a filling port 29 adjustable is. In the region of the cylinder tube 3, which is located over the entire working stroke length of the separating piston 13 between the first and second sealing region, ie between the sealing ring 17 and the sealing ring 25, is provided as venting possibility, which allows a discharge of leak media, a vent hole 31st formed continuously in the wall of the cylinder tube 3. In the region of the inner mouth of the vent hole 31 is in the inner wall of the cylinder tube 3 extending over the entire circumference of the inner wall, annular groove-like recess 33 with bevelled Side edges 35 incorporated. The recess 33 also prevents shearing of the seals 25 and 27 during assembly, when they are pushed over the bore 31. Together with a recess 37 incorporated in the circumference of the separating piston 13, an inner chamber communicating with the venting bore 31 is formed on the circumference of the separating piston 13, into which leakage media can enter if creeping of liquid molecules should take place through the sealing ring 17 or Sealing rings 27 and 25 should be overcome by the small gas molecules of the filling gas on the gas side 23. Such eventual leak media pass through the vent hole 31 into a collection chamber 39 into which the outer end of the vent hole 31 opens.

Diese Sammelkammer 39 ist beim gezeigten Ausführungsbeispiel durch einen auf der Außenseite des Zylinderrohres 3 sitzenden Ringkörper 41 gebildet. Dieser ist ein aus Kunststoff oder Metallblech einstückig geformter Profilkörper mit einer flachen äußeren Ringfläche 43, die seitlich von sich zu ihr senkrecht erstreckenden Randleisten 45 eingefaßt ist, deren freie Enden an der Außenseite des Zylinderrohres 3 anliegen, so daß die Ringfläche 43 äquidistant in einem Abstand von der Außenseite des Zylinderrohres 3 gehalten ist. Durch O-Ringe 47 sind die Randleisten 45 gegenüber der Außenseite des Zylinderrohres 3 abgedichtet. Die so gebildete Sammelkammer 39 weist als Auslaß ins Freie eine Bohrung 49 auf, die mittels einer Ventilanordnung geöffnet oder verschlossen wird. Hierbei handelt es sich um ein elastisches Band 51, das die Ringfläche 43 des Ringkörpers 41 umschlingt. Die Vorspannung, mit der das Band 51 auf der Ringfläche 43 aufliegt, ist so gewählt, daß das Band 51 bei einem vorbestimmten Überdruck in der Sammelkammer 39 von der Bohrung 49 abhebt, um in der Sammelkammer befindliche Medien an die Umgebung abzugeben.This collection chamber 39 is formed in the embodiment shown by a seated on the outside of the cylinder tube 3 ring body 41. This is a molded plastic or sheet metal integrally formed profile body with a flat outer annular surface 43 which is laterally bordered by its perpendicular to extending edge strips 45, abut the free ends on the outside of the cylinder tube 3, so that the annular surface 43 equidistant at a distance is held by the outside of the cylinder tube 3. By O-rings 47, the edge strips 45 are sealed relative to the outside of the cylinder tube 3. The collection chamber 39 thus formed has as an outlet to the outside a bore 49 which is opened or closed by means of a valve arrangement. This is an elastic band 51, which wraps around the annular surface 43 of the annular body 41. The bias voltage with which the band 51 rests on the annular surface 43 is selected so that the band 51 lifts at a predetermined overpressure in the collection chamber 39 from the bore 49 to deliver located in the collection chamber media to the environment.

In der Figur ist die den Auslaß bildende Bohrung 49 an der in der Zeichnung oben liegenden Seite des Zylinderrohres 3 gezeigt. Um zu ermöglichen, daß bei beliebigem Einbau des Kolbenspeichers die Entlüftungsmöglichkeit nach oben führt, ist der Ringkörper 41 auf dem Zylinderrohr 3 drehbar, um zu ermöglichen, daß die Bohrung 49 auf die höchstgelegene Stelle einstellbar ist.In the figure, the bore 49 forming the outlet is shown on the side of the cylinder tube 3 at the top in the drawing. In order to allow the venting possibility to be carried upwards with any installation of the piston accumulator, the annular body 41 is rotatable on the cylinder tube 3 to allow the bore 49 to be set to the highest point.

Anstelle der Abdichtung der Sammelkammer 39 gegen das Zylinderrohr 3 mittels der O-Ringe 47 könnten die Enden der Randleisten 45 als mit dem Zylinderrohr 3 unmittelbar zusammenwirkende Dichtkanten ausgebildet sein. Anstelle einer frei durchgehenden Entlüftungsbohrung 31 könnte eine einen porösen, stopfenartigen Einsatz enthaltende Bohrung vorgesehen sein, beispielsweise unter Verwendung eines Stopfens aus einem porösen Sinterwerkstoff.Instead of sealing the collection chamber 39 against the cylinder tube 3 by means of the O-rings 47, the ends of the edge strips 45 may be formed as with the cylinder tube 3 directly cooperating sealing edges. Instead of a freely continuous vent bore 31, a bore containing a porous, plug-like insert could be provided, for example using a plug made of a porous sintered material.

In dem Umfangsbereich des Trennkolbens 13, der zwischen zweitem und drittem Abdichtungsbereich gelegen ist, also zwischen den Dichtringen 25 und 27, ist in den Umfang des Trennkolbens 13 eine Ringnut 53 eingearbeitet, die mit einer im Trennkolben 13 befindlichen Versorgungseinrichtung für die Zufuhr eines fließfähigen Schmierstoffes in Verbindung steht. Der Trennkolben 13 weist zu diesem Zweck einen innen liegenden, konzentrischen Hilfszylinder 55 auf, der zur Fluidseite 15 hin geschlossen und gegen die Gasseite 23 hin geöffnet ist. Von der Gasseite 23 her ist in den Hilfszylinder 55 ein Hilfskolben 57 eingeführt, der eine umfängliche Kolbendichtung 59 aufweist und gegen einen Austritt aus dem Hilfszylinder 55 durch einen Sprengring 61 gesichert ist. Das zwischen dem Hilfskolben 57 und dem geschlossenen Ende des Hilfszylinders 55 gelegene Volumen ist mit einem Vorrat eines fließfähigen Schmierstoffes gefüllt. Ein Verbindungskanal 63 im Trennkolben 13 verbindet diesen Schmierstoff - Vorratsraum mit der Ringnut 53 am Umfang des Trennkolbens 13.In the peripheral region of the separating piston 13, which is located between the second and third sealing region, ie between the sealing rings 25 and 27, an annular groove 53 is incorporated into the periphery of the separating piston 13, which is provided with a supply device for supplying a flowable lubricant in the separating piston 13 communicates. The separating piston 13 has for this purpose an inner, concentric auxiliary cylinder 55 which is closed to the fluid side 15 and open towards the gas side 23. From the gas side 23 forth in the auxiliary cylinder 55, an auxiliary piston 57 is inserted, which has a circumferential piston seal 59 and is secured against escaping from the auxiliary cylinder 55 by a snap ring 61. The volume between the auxiliary piston 57 and the closed end of the auxiliary cylinder 55 is filled with a supply of a flowable lubricant. A connection channel 63 in the separating piston 13 connects this lubricant reservoir with the annular groove 53 on the circumference of the separating piston 13.

Der Hilfskolben 57 ist durch eine Schrauben - Druckfeder 65 federbelastet, die sich an einer mittels eines Sprengringes 67 am Trennkolben 13 fixierten Halteplatte 69 abstützt. Somit wirkt am Hilfskolben 57 nicht nur der Druck der Gasseite 23, sondern auch die Federvorspannung, so daß der Hilfskolben 57 in dem den Schmierstoff - Vorrat enthaltenden Raum einen Förderdruck erzeugt, durch den der Schmierstoff in die Ringnut 53 gedrückt wird. Bei dem Schmierstoff handelt es sich um ein hochviskoses Öl oder fließfähiges Fett. Hierdurch wird neben der Schmierung der Dichtringe 25,27 an den betreffenden Abdichtungsbereichen des Trennkolbens 13 eine zusätzliche Sperr- oder Abdichtungswirkung erzeugt. Insgesamt ergibt sich ein besonders gutes Langzeitverhalten des Kolbenspeichers, insbesondere eine vollständige Sicherheit gegen einen Übertritt des Mediums der Gasseite 23 zur Fluidseite 15, so daß sich der erfindungsgemäße Kolbenspeicher insbesondere auch für einen Einsatz bei Bremssystemen eignet.The auxiliary piston 57 is spring-loaded by a helical compression spring 65, which is supported on a holding plate 69 which is fixed on the separating piston 13 by means of a snap ring 67. Thus, not only the pressure of the gas side 23 acts on the auxiliary piston 57, but also the spring preload, so that the auxiliary piston 57 generates a delivery pressure in the space containing the lubricant reservoir, through which the lubricant is forced into the annular groove 53. The lubricant is a high-viscosity oil or free-flowing grease. As a result, in addition to the lubrication of the sealing rings 25,27 at the respective sealing regions of the separating piston 13, an additional blocking or sealing effect is generated. Overall, a particularly good long-term behavior of the piston accumulator, in particular a complete security against a passage of the medium of the gas side 23 to the fluid side 15, so that the piston accumulator according to the invention is particularly suitable for use in brake systems.

Des weiteren besteht die Möglichkeit, wie dies insbesondere die Abbildung zeigt, innerhalb des Gehäuses 1 einen buchsenartigen Anschlagkörper 70 einzusetzen, der verhindert, daß die Dichtung 17 in die Nut 33 rutscht, sofern der Trennkolben 13 in eine weit erhöhte Stellung (nicht dargestellt) zurückfahren sollte. Der dahingehende Anschlagkörper 70 liegt mit seinem Außenumfang bündig am Innenumfang des Speichergehäuses 1 an und erstreckt sich ansonsten zwischen der Endwand 5 und dem einen freien Ende des Trennkolbens 13, sofern dieser, wie in der Figur dargestellt, auf Anschlag gegen den Anschlagkörper 70 fährt. Ansonsten ist der Anschlagkörper 70 durch seine Eigenspannung im Inneren des Speichergehäuses 1 in seiner gezeigten Lage fixiert. Anstelle des Anschlagkörpers 70 kann auch eine Vorkragung oder ein sonstiges Anschlagmittel auf der Innenseite des Speichergehäuses 1 dienen, wobei die Anordnung sinnfällig so gewählt wird, daß das Dichtmittel 17 beim Betrieb der Vorrichtung nicht in die Nut 33 gelangen kann.Furthermore, there is the possibility, as shown in particular the figure, to use inside the housing 1 a bush-like stopper body 70, which prevents the seal 17 slips into the groove 33, if the separating piston 13 in a high position (not shown) back should. The pertinent stop body 70 is flush with its outer periphery on the inner circumference of the storage housing 1 and extends otherwise between the end wall 5 and the one free end of the separating piston 13, provided that, as shown in the figure, stops against the stop body 70. Otherwise, the stopper body 70 is fixed by its internal stress in the interior of the storage housing 1 in its position shown. Instead of the stopper body 70 may also be a Vorkragung or other stop means on the inside of the storage enclosure 1, wherein the arrangement is clearly chosen so that the sealant 17 can not enter the groove 33 during operation of the device.

Claims (5)

  1. Piston store with a separating piston (13) axially displaceable within a store housing (1), the same separating a fluid side (15) of the store from its gas side (23) and comprising two sealing sections (17, 25) offset from one another in an axial direction on the circumference of the inside wall of the store housing (1), whereby
    - the store housing (1) comprises a venting means (31) for venting media leaked into the sealing sections (17, 25) at a point located between the sealing sections (17, 25) of the separating piston (13),
    - a venting bore (31) is envisaged continuously formed in a wall of the store housing (1) as a venting means,
    - the outlet end of the venting bore (31) is connected with a collection chamber (39) for receiving the leaked media,
    - the collection chamber (39) comprises an outlet (49) enabling a venting to atmosphere,
    - the outlet (49) comprises a normally closed valve arrangement (51) that can be opened by the pressure existing inside the collection chamber (39),
    - the collection chamber (39) is formed by an annular body (41) seated on the outside of a cylindrical pipe (3) of the store housing (1) receiving the separating piston (31) which comprises a bore (49) forming the outlet,
    characterised in that
    - the annual body (41) comprises an annular surface (43) extending equidistantly to the outside of the cylindrical pipe (3) which is held by radially inwardly projecting edge strips (45) following the same on both sides at a distance defining the inside width of the collection chamber (39) from the cylindrical pipe (3), and
    - an elastic band (51) surrounding the annular surface (43) and covering the bore (49) is envisaged as the valve arrangement of the outlet.
  2. Piston store according to Claim 1, characterised in that the insides of the edge strips (45) facing each other are each sealed by means of a sealing element (47) against the outside of the cylindrical pipe (3).
  3. Piston store according to Claim 1 or 2, characterised in that the separating piston (13) comprises a recess (37) inserted into its circumference in a section located between the sealing sections (17, 25) co-operating with the venting means (31).
  4. Piston store according to one of the Claims 1 to 3, characterised in that the separating piston (13) comprises a third sealing section (27) that is axially offset still further towards the gas side (23) in addition to the first sealing section (17) adjacent to the fluid side (15) and the second sealing section (25) axially offset towards the gas side (23), and in that a supply means (55, 57; 63) for the supply of a flowable lubricant to the circumference section (53) of the separating piston (13) located between the second and third sealing section (25, i.e. 27) is envisaged in the separating piston (13).
  5. Piston store according to one of the Claims 1 to 4, characterised in that the inside end of the venting bore (31) opens out into an annular grooved recess (33) inserted into the inside wall of the store housing (1) which continuously extends around the inside circumference in a direction vertical to the axial direction.
EP02760250A 2001-08-16 2002-07-18 Piston-type accumulator Expired - Fee Related EP1478858B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10139192 2001-08-16
DE10139192A DE10139192A1 (en) 2001-08-16 2001-08-16 piston accumulators
PCT/EP2002/007982 WO2003016723A2 (en) 2001-08-16 2002-07-18 Piston-type accumulator

Publications (2)

Publication Number Publication Date
EP1478858A2 EP1478858A2 (en) 2004-11-24
EP1478858B1 true EP1478858B1 (en) 2006-06-07

Family

ID=7694939

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02760250A Expired - Fee Related EP1478858B1 (en) 2001-08-16 2002-07-18 Piston-type accumulator

Country Status (5)

Country Link
US (1) US6923215B2 (en)
EP (1) EP1478858B1 (en)
JP (1) JP3996576B2 (en)
DE (2) DE10139192A1 (en)
WO (1) WO2003016723A2 (en)

Families Citing this family (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10303988A1 (en) * 2003-02-01 2004-08-19 Hydac Technology Gmbh Method of manufacturing piston accumulators
DE10313241A1 (en) 2003-03-25 2004-10-21 Hydac Technology Gmbh piston accumulators
DE102004002266A1 (en) * 2004-01-16 2005-08-11 Hydac Technology Gmbh piston accumulators
EP1718890B1 (en) * 2004-02-25 2015-09-16 BUCKNELL, John Wentworth Seals for hydraulic assemblies
EP1602832A1 (en) * 2004-06-02 2005-12-07 Tecnica dell'aria S.r.l. Double-acting operating cylinder
DE102004048822A1 (en) * 2004-10-07 2006-04-13 Continental Teves Ag & Co. Ohg Electro hydraulic module especially for vehicle brakes has a compact layout with two coaxial pistons and a damping chamber
US7493916B2 (en) * 2005-12-12 2009-02-24 Bosch Rexroth Corporation Pressure vessel with accumulator isolation device
SE530992C2 (en) * 2006-03-10 2008-11-11 Haldex Traction Ab Accumulator, hydraulic system and all-wheel clutch
CN100376807C (en) * 2006-07-12 2008-03-26 三一重工股份有限公司 Piston type energy accumulator
JP4993095B2 (en) * 2007-06-22 2012-08-08 メディカテック株式会社 Lubricating device in dispenser
US20090191068A1 (en) * 2008-01-29 2009-07-30 Clark Equipment Company Variable volume reservoir
DE102008061221A1 (en) * 2008-12-09 2010-06-10 Hydac Technology Gmbh Hydraulic accumulator, in particular bellows accumulator
DE102009048668A1 (en) * 2009-09-29 2011-03-31 Siemens Aktiengesellschaft Integrated hydraulic accumulator arrangement
US9127661B2 (en) 2010-10-25 2015-09-08 Hamilton Sundstrand Corporation Bootstrap accumulator system with telescoping actuator cylinder
US9080710B2 (en) * 2011-01-21 2015-07-14 Hamilton Sundstrand Corporation Accumulator reservoir venting
DE102011117752A1 (en) * 2011-11-05 2013-05-08 Hydac Technology Gmbh Hydraulic accumulator in the form of a bellows accumulator
ITBO20120085A1 (en) * 2012-02-22 2013-08-23 Magneti Marelli Spa HYDRAULIC SERVO OF A SERVO-CHANGE
ITBO20120084A1 (en) * 2012-02-22 2013-08-23 Magneti Marelli Spa HYDRAULIC SERVO OF A SERVO-CHANGE
JP5215484B2 (en) * 2012-03-01 2013-06-19 メディカテック株式会社 Lubricating device in dispenser
ITBO20120233A1 (en) * 2012-04-27 2013-10-28 Magneti Marelli Spa HYDRAULIC SERVO OF A SERVO-CHANGE
US9541099B2 (en) * 2013-04-17 2017-01-10 Ford Global Technologies, Llc Self replenishing accumulator
US10578130B2 (en) 2013-04-18 2020-03-03 Hamilton Sundstrand Corporation Reservoir vent and thermal stabilization orifice
DE102013010344B3 (en) * 2013-06-20 2014-10-02 L'orange Gmbh Pressure accumulator and method of execution with such
US9739292B1 (en) 2014-03-21 2017-08-22 Kocsis Technologies, Inc. Hydraulic accumulator having a closing arrangement
US9964124B2 (en) * 2015-09-02 2018-05-08 Deere & Company Piston accumulator with integrated cylinder rod
US9709077B2 (en) * 2015-12-17 2017-07-18 ROTEX Manufacturers and Engineers Limited Hydro pneumatic accumulator with internal leak detection
DE102016003153A1 (en) * 2016-03-15 2017-09-21 Hydac Technology Gmbh Storage device and hydropneumatic suspension
US10954966B2 (en) 2017-10-25 2021-03-23 Raytheon Company Bootstrap accumulator containing integrated bypass valve

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1277968A1 (en) * 2001-07-20 2003-01-22 Robert Bosch Gmbh Venting closure for external venting of a piston type accumulator

Family Cites Families (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2683467A (en) 1952-05-23 1954-07-13 Greer Hydraulies Inc Piston accumulator
US2817361A (en) * 1953-02-10 1957-12-24 Mercier Jean Piston accumulator
US3074437A (en) * 1953-02-10 1963-01-22 Mercier Jean Piston accumulator
US2873763A (en) * 1954-01-22 1959-02-17 Mercier Jean Sealing means for a slidable member in a pressure unit
US3863677A (en) * 1973-04-23 1975-02-04 Parker Hannifin Corp Accumulator with combination guide and seal ring
US4187682A (en) * 1979-01-02 1980-02-12 The Boeing Company Constant pressure hydraulic accumulator
US4538972A (en) * 1983-12-30 1985-09-03 United Aircraft Products, Inc. Bootstrap reservoir
US4678010A (en) * 1985-02-22 1987-07-07 Gene Purvis Accumulator for airless spraying apparatus
US4693276A (en) * 1986-04-29 1987-09-15 Allied Corporation Pressure-balanced seals for vented accumulators
US4651782A (en) 1986-04-29 1987-03-24 Allied Corporation Pressure-balanced seals for vented accumulators
US4674541A (en) * 1986-06-09 1987-06-23 Allied Corporation Multiple seal for a pressure vessel
US4685491A (en) * 1986-08-14 1987-08-11 Allied Corporation Accumulator having fluid-lubricating seals
DE3917797A1 (en) * 1989-06-01 1990-12-06 Bosch Gmbh Robert PRINT MEDIA STORAGE, ESPECIALLY FOR VEHICLE BRAKING SYSTEMS
DE3930557A1 (en) * 1989-09-13 1991-03-14 Bosch Gmbh Robert PRINT MEDIA STORAGE, ESPECIALLY FOR VEHICLE BRAKING SYSTEMS
JP3222454B2 (en) 1990-02-02 2001-10-29 キヤノン株式会社 Ink tank cartridge
JPH0972310A (en) 1995-09-01 1997-03-18 Nok Corp Sealing device for piston
DE19651842A1 (en) * 1996-12-13 1998-06-18 Bosch Gmbh Robert Media separation device, in particular for hydraulic brake systems in vehicles
JPH1191532A (en) * 1997-09-26 1999-04-06 Aisin Seiki Co Ltd Vehicular brake device
JP2000186701A (en) * 1998-12-21 2000-07-04 Aisin Seiki Co Ltd Piston-type accumulator
JP2003529726A (en) * 2000-04-04 2003-10-07 コンティネンタル・テーベス・アクチエンゲゼルシヤフト・ウント・コンパニー・オッフェネ・ハンデルスゲゼルシヤフト Pressure medium accumulator

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1277968A1 (en) * 2001-07-20 2003-01-22 Robert Bosch Gmbh Venting closure for external venting of a piston type accumulator

Also Published As

Publication number Publication date
JP2005502002A (en) 2005-01-20
US20040238054A1 (en) 2004-12-02
JP3996576B2 (en) 2007-10-24
WO2003016723A2 (en) 2003-02-27
EP1478858A2 (en) 2004-11-24
WO2003016723A3 (en) 2004-08-26
US6923215B2 (en) 2005-08-02
DE50207143D1 (en) 2006-07-20
DE10139192A1 (en) 2003-03-06

Similar Documents

Publication Publication Date Title
EP1478858B1 (en) Piston-type accumulator
DE3133839C2 (en)
DE102016115645B4 (en) battery case
DE102011101968B4 (en) fluid pressure device
EP1709334A1 (en) Pressure accumulator, especially pulsation damper
DE19743006A1 (en) Accumulator with an internal elastomer member
DE102006026824B4 (en) Two-way pilot
EP0299431A1 (en) Gas spring incorporating a floating sealing ring with a valve function
DE102009049547B3 (en) Hydropneumatic pressure accumulator
DE19717652A1 (en) Vehicle suspension shock absorbing cylinder
EP1952032B1 (en) Hydraulic/pneumatic control valve with fail-safe function
DE2226610C3 (en) Accumulator loading valve
DE3000682A1 (en) CONTROL VALVE FOR HYDRAULIC SYSTEMS
DE10122652B4 (en) Gas piston accumulator and method for preparing a gas piston accumulator
DE29711131U1 (en) Multi-way valve
EP1104498B1 (en) Hydraulic fluid accumulator
DE19701303A1 (en) Piston accumulator with sealing device
CH639733A5 (en) Hydraulic damping device, especially for damping the movement of the closure piece of a valve
EP1342922B1 (en) Pressure accumulator
EP0080565A2 (en) End of travel cushioning device for a piston of a double acting cylinder
EP4025790B1 (en) Piston accumulator
DE10205814A1 (en) Pressure media storage unit for electrohydraulic brake comprises a gas and fluid separation element provided with a guide which is constituted as a valve blocking two fluid spaces from one another
DE3734058A1 (en) Hydraulically activated 2/2-way directional valve
DE4414175A1 (en) Sealing arrangement for a shut-off device, such as a slide, flap or the like
DE4304117A1 (en) Pressure reduction valve constructed as a piston slide

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20031216

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR

17Q First examination report despatched

Effective date: 20050202

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

RBV Designated contracting states (corrected)

Designated state(s): DE FR

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR

REF Corresponds to:

Ref document number: 50207143

Country of ref document: DE

Date of ref document: 20060720

Kind code of ref document: P

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20070308

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 15

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 16

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20170704

Year of fee payment: 16

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20180731

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20190731

Year of fee payment: 18

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 50207143

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20210202