EP1327080B1 - Method for filling a hydraulic accumulator and device for carrying out said method - Google Patents

Method for filling a hydraulic accumulator and device for carrying out said method Download PDF

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Publication number
EP1327080B1
EP1327080B1 EP01986568A EP01986568A EP1327080B1 EP 1327080 B1 EP1327080 B1 EP 1327080B1 EP 01986568 A EP01986568 A EP 01986568A EP 01986568 A EP01986568 A EP 01986568A EP 1327080 B1 EP1327080 B1 EP 1327080B1
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EP
European Patent Office
Prior art keywords
chamber
pressure medium
filling
filled
bottom valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP01986568A
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German (de)
French (fr)
Other versions
EP1327080A2 (en
Inventor
Andreas Klein
Christian Albrich Von Albrichsfeld
Manfred Rüffer
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Continental Teves AG and Co OHG
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Continental Teves AG and Co OHG
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Priority claimed from DE10139811A external-priority patent/DE10139811A1/en
Application filed by Continental Teves AG and Co OHG filed Critical Continental Teves AG and Co OHG
Publication of EP1327080A2 publication Critical patent/EP1327080A2/en
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Publication of EP1327080B1 publication Critical patent/EP1327080B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/04—Accumulators
    • F15B1/08—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor
    • F15B1/10—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating means
    • F15B1/103—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating means the separating means being bellows
    • 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
    • F15B1/027—Installations or systems with accumulators having accumulator charging devices
    • F15B1/033—Installations or systems with accumulators having accumulator charging devices with electrical control means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • 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
    • F15B1/22—Liquid port constructions
    • 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
    • F15B2201/20—Accumulator cushioning means
    • F15B2201/21—Accumulator cushioning means using springs
    • 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
    • F15B2201/3153—Accumulator separating means having flexible separating means the flexible separating means being bellows
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/40—Constructional details of accumulators not otherwise provided for
    • F15B2201/41—Liquid ports
    • F15B2201/411—Liquid ports having valve means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/50—Monitoring, detection and testing means for accumulators
    • F15B2201/51—Pressure detection
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/60—Assembling or methods for making accumulators

Definitions

  • the invention relates to a method for filling a pressure medium accumulator with a housing, the interior of which is divided by a serving as a media separation element metallic bellows in two chambers, wherein the first chamber is filled with a gas and the second chamber with a liquid pressure medium and wherein in a hydraulic Connection a bottom valve is provided, the closing body is actuated by the media separation element and which allows filling of the second chamber with the pressure medium and prevents complete emptying of the second chamber.
  • the present invention relates to a device for filling a pressure fluid reservoir with a housing, the interior of which serves as a media separation element metallic bellows in two chambers is divided, wherein the first chamber is filled with a gas and the second chamber with a liquid pressure medium and wherein in a hydraulic connection, a bottom valve is provided, the closing body is actuated by the media separation element and filling the second chamber with the pressure medium allows and prevents complete emptying of the second chamber, wherein means for evacuating the second chamber, means for filling the second chamber with pressure medium, and means for filling the gas are provided in the first chamber, and wherein a connectable to the first chamber, the Gas supply serving first line and a second line connectable to the second line is provided, which is selectively connectable to a pressure medium source or a vacuum source.
  • Such a pressure fluid accumulator is known from international patent application WO 00/31420.
  • the closing body of the bottom valve is brought by the movement of the bellows in a position in which it performs the function of a hydraulic piston.
  • both damage to the bottom valve and an undesired discharge of pressure medium are effectively prevented, a significant increase in the reliability is guaranteed.
  • the cited publication are no indications as to how the previously mentioned chambers can be reliably filled with appropriate media, without the bellows is damaged.
  • a method for filling a pressure medium accumulator of the type mentioned is known.
  • the second chamber is first filled with a pressure medium, after which a gas is introduced into the first chamber.
  • the pressure medium is only partially displaced and serves, after the bottom valve has been closed, as a support for the bellows, so that damage to the bellows during the filling of the gas is avoided.
  • This object is procedurally achieved in that when filling the second chamber with the defined pressure medium volume of the path traveled by the bellows is sensed.
  • a device for opening or keeping open the bottom valve is provided.
  • the pressure medium reservoir to be filled according to the method according to the invention has a housing 1 whose interior is subdivided by means of a media separation element 2 into two pressure chambers or chambers 3, 4.
  • the media separation element 2 is preferably formed by a thin-walled metallic bellows, on the one hand pressure-tight manner with a lid 8 closing the housing 1 and on the other hand is closed by a plate 9.
  • the interior of the bellows 2 forms the first chamber 3, which can be filled via a filling connection 10 provided in the cover 8 with a gas which is generally under high pressure.
  • a hydraulic port 5 is formed, in which a bottom valve 6 is arranged, the closing body 7 protrudes into the second chamber 4.
  • the bottom valve 6 is preferably designed such that it on the one hand allows filling of the second chamber 4 with a pressurized fluid pressure medium, such as a brake fluid, and on the other hand prevents complete emptying of the second chamber 4.
  • a pressurized fluid pressure medium such as a brake fluid
  • a compression spring 11 located in the first chamber 3, a compression spring 11, the between the cover 8 and the aforementioned plate 9 is clamped and thus biases the bellows 2 in the direction of the bottom valve 6. This ensures that the pressure prevailing in the second chamber 4 hydraulic pressure is always higher than that prevailing in the first chamber 3 gas pressure.
  • a sensor device for sensing the movement of the media separation element 2, which is provided with the reference numeral 12, is provided in the gas-filled first chamber 3.
  • the sensor device 12 which may be formed, for example, as an inductive displacement sensor, is an independently manageable assembly, which can be used in an opening provided in the lid 8.
  • first pressure sensor 19 for monitoring the pressure medium filling pressure
  • second pressure sensor 20 for monitoring the level of the negative pressure applied by the negative pressure source 15
  • displacement sensor 21 for monitoring the movement of the device 16 for mechanically opening or keeping the bottom valve 6 open
  • the previously mentioned plate 9 is under the action of the compression spring 11 at a first stop (for example, at the bottom of the housing 1) and that the bottom valve 6 is closed.
  • This output state corresponds to a signal value of the displacement sensor 12, which is determined and stored.
  • the determined signal value is later used in operation to detect defects on the bottom valve 6.
  • the first chamber 3 is acted upon with low pressure (eg with compressed air up to 2 bar).
  • the second line 14 is connected by opening the associated shut-off valve 18 to the vacuum source 15 and the second chamber 4 evacuated.
  • the second chamber 4 is provided with a pressure medium provided for this purpose, preferably a brake fluid, completely filled under low pressure, wherein the bellows 2 is compressed by a small amount.
  • the pressure spring 11 or the gas pressure acting in the first chamber 3 then causes a slow outflow of the excess pressure medium volume until the bottom valve 6 closes. Since the closing body 7 of the bottom valve, the plate 9 closing the bellows 2 and the displacement sensor 12 are in contact with each other , the signal value of the displacement sensor 12, at which the bottom valve 6 closes, can be determined and stored.
  • a defined pressure medium volume is refilled, which corresponds to the system-related minimum requirements and the z. B. represents the volume value, which ensures a perfect function of the accumulator at the temperature of 120 ° C.
  • the bellows 2 is compressed or a movement of the plate 9 closing it up into a defined position, which corresponds to a third signal value of the displacement sensor 12.
  • the signal value is again determined and stored.

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

Description

Die Erfindung betrifft ein Verfahren zum Befüllen eines Druckmittelspeichers mit einem Gehäuse, dessen Innenraum durch einen als Medientrennungselement dienenden metallischen Faltenbalg in zwei Kammern unterteilt ist, wobei die erste Kammer mit einem Gas und die zweite Kammer mit einem flüssigen Druckmittel gefüllt ist und wobei in einem hydraulischen Anschluß ein Bodenventil vorgesehen ist, dessen Schließkörper durch das Medientrennungselement betätigbar ist und das ein Befüllen der zweiten Kammer mit dem Druckmittel ermöglicht und ein vollständiges Entleeren der zweiten Kammer verhindert.The invention relates to a method for filling a pressure medium accumulator with a housing, the interior of which is divided by a serving as a media separation element metallic bellows in two chambers, wherein the first chamber is filled with a gas and the second chamber with a liquid pressure medium and wherein in a hydraulic Connection a bottom valve is provided, the closing body is actuated by the media separation element and which allows filling of the second chamber with the pressure medium and prevents complete emptying of the second chamber.

Außerdem betrifft die vorliegende Erfindung eine Vorrichtung zum Befüllen eines Druckmittelspeichers mit einem Gehäuse, dessen Innenraum durch einen als Medientrennungselement dienenden metallischen Faltenbalg in zwei Kammern unterteilt ist, wobei die erste Kammer mit einem Gas und die zweite Kammer mit einem flüssigen Druckmittel gefüllt ist und wobei in einem hydraulischen Anschluß ein Bodenventil vorgesehen ist, dessen Schließkörper durch das Medientrennungselement betätigbar ist und das ein Befüllen der zweiten Kammer mit dem Druckmittel ermöglicht und ein vollständiges Entleeren der zweiten Kammer verhindert, wobei Mittel zum Evakuieren der zweiten Kammer, Mittel zum Befüllen der zweiten Kammer mit Druckmittel, sowie Mittel zum Einfüllen des Gases in die erste Kammer vorgesehen sind, und wobei eine an die erste Kammer anschließbare, der Gaszufuhr dienende erste Leitung sowie eine an die zweite Kammer anschließbare zweite Leitung vorgesehen ist, die wahlweise mit einer Druckmittelquelle oder einer Unterdruckquelle verbindbar ist.In addition, the present invention relates to a device for filling a pressure fluid reservoir with a housing, the interior of which serves as a media separation element metallic bellows in two chambers is divided, wherein the first chamber is filled with a gas and the second chamber with a liquid pressure medium and wherein in a hydraulic connection, a bottom valve is provided, the closing body is actuated by the media separation element and filling the second chamber with the pressure medium allows and prevents complete emptying of the second chamber, wherein means for evacuating the second chamber, means for filling the second chamber with pressure medium, and means for filling the gas are provided in the first chamber, and wherein a connectable to the first chamber, the Gas supply serving first line and a second line connectable to the second line is provided, which is selectively connectable to a pressure medium source or a vacuum source.

Ein derartiger Druckmittelspeicher ist aus der internationalen Patentanmeldung WO 00/31420 bekannt. Der Schließkörper des Bodenventils ist durch die Bewegung des Faltenbalgs in eine Lage bringbar, in der er die Funktion eines hydraulischen Kolbens erfüllt. Da dadurch sowohl eine Beschädigung des Bodenventils als auch ein ungewollter Druckmittelaustritt wirksam verhindert werden, wird eine erhebliche Erhöhung der Funktionssicherheit gewährleistet. Der genannten Veröffentlichung sind jedoch keine Hinweise zu entnehmen, wie die vorhin genannten Kammern mit entsprechenden Medien zuverlässig gefüllt werden können, ohne daß der Faltenbalg beschädigt wird.Such a pressure fluid accumulator is known from international patent application WO 00/31420. The closing body of the bottom valve is brought by the movement of the bellows in a position in which it performs the function of a hydraulic piston. As a result, both damage to the bottom valve and an undesired discharge of pressure medium are effectively prevented, a significant increase in the reliability is guaranteed. The cited publication, however, are no indications as to how the previously mentioned chambers can be reliably filled with appropriate media, without the bellows is damaged.

Aus der EP 0 391 320 A1 ist ein Verfahren zum Befüllen eines Druckmittelspeichers der eingangs genannten Gattung bekannt. Bei dem vorbekannten Verfahren ist vorgesehen, dass die zweite Kammer zunächst mit einem Druckmittel befüllt wird, wonach in die erste Kammer ein Gas eingefüllt wird. Dabei wird das Druckmittel nur teilweise verdrängt und dient, nachdem das Bodenventil geschlossen wurde, als Stütze für den Faltenbalg, sodass eine Beschädigung des Faltenbalgs bei der Einfüllung des Gases vermieden wird.From EP 0 391 320 A1 a method for filling a pressure medium accumulator of the type mentioned is known. In the previously known method, it is provided that the second chamber is first filled with a pressure medium, after which a gas is introduced into the first chamber. The pressure medium is only partially displaced and serves, after the bottom valve has been closed, as a support for the bellows, so that damage to the bellows during the filling of the gas is avoided.

Um zusätzlich zu verhindern, dass beim Befüllen mit Druckmittel keine Gasblasen entstehen und sich kein Gas im Druckmittel lösen kann, ist aus der US-A 5 060 703 bekannt, dass die Bremsanlage bzw. der Druckmittelspeicher vor dem Befüllen mit Druckmittel evakuiert wird.In order to prevent in addition that no gas bubbles arise during filling with pressure medium and no gas can dissolve in the pressure medium, it is known from US Pat. No. 5,060,703 that the brake system or the pressure fluid accumulator is evacuated prior to filling with pressure medium.

Als weniger vorteilhaft ist bei den vorbekannten Verfahren anzusehen, dass zwar bei der Befüllung des Druckmittelspeichers eine Beschädigung des Medientrennungselementes vermieden werden kann, im weiteren Betrieb eine Beschädigung aber nicht ausgeschlossen werden kann.As less advantageous is to be regarded in the prior art method, that while the filling of the accumulator damage to the media separation element can be avoided, damage in the further operation but can not be excluded.

Es ist daher Aufgabe der vorliegenden Erfindung, ein Verfahren sowie eine Vorrichtung zum Befüllen eines Druckmittelspeichers der eingangs genannten Gattung vorzuschlagen, die gewährleisten, dass bei der Befüllung des Druckmittelspeichers Signalwerte ermittelt werden, die es ermöglichen, dass ein Zerstören des Medientrennungselementes im Betrieb verhindert wird und dass ein möglicher Defekt des Bodenventils erkannt wird.It is therefore an object of the present invention to propose a method and a device for filling a pressure medium accumulator of the type mentioned, which ensure that when filling the pressure medium memory signal values are determined, which allow a destruction of the Media separation element is prevented during operation and that a possible defect of the bottom valve is detected.

Diese Aufgabe wird verfahrensmäßig dadurch gelöst, dass beim Befüllen der zweiten Kammer mit dem definierten Druckmittelvolumen der vom Faltenbalg zurückgelegte Weg sensiert wird.This object is procedurally achieved in that when filling the second chamber with the defined pressure medium volume of the path traveled by the bellows is sensed.

Zur Konkretisierung des Erfindungsgedankens ist vorgesehen, dass bei gleichzeitiger Sensierung des Zustands des Bodenventils aus der zweiten Kammer Druckmittel so lange dosiert entnommen wird, bis der Schließzustand des Bodenventils erreicht ist.To concretize the idea of the invention, it is provided that with simultaneous sensing of the state of the bottom valve from the second chamber, pressure medium is withdrawn in metered quantities until the closed state of the bottom valve is reached.

Weitere vorteilhafte Merkmale des erfindungsgemäßen Verfahrens sind in den Unteransprüchen 3 bis 5 aufgeführt.Further advantageous features of the method according to the invention are listed in the subclaims 3 to 5.

Bei einer Vorrichtung zur Durchführung des erfindungsgemäßen Verfahrens ist eine Einrichtung zum Öffnen bzw. Offenhalten des Bodenventils vorgesehen.In a device for carrying out the method according to the invention, a device for opening or keeping open the bottom valve is provided.

Vorteilhafte Weiterbildungen der Vorrichtung nach der vorliegenden Erfindung sind den Unteransprüchen 7 und 8 zu entnehmen.Advantageous developments of the device according to the present invention can be found in the subclaims 7 and 8.

Die Erfindung wird in der nachfolgenden Beschreibung unter Bezugnahme auf die beiliegende Zeichnung näher erläutert, deren einzige Figur eine schematische Darstellung der vorhin erwähnten Vorrichtung zur Durchführung des erfindungsgemäßen Verfahrens zeigt.The invention will be explained in more detail in the following description with reference to the accompanying drawing, the single figure shows a schematic representation of the aforementioned device for carrying out the method according to the invention.

Wie der Zeichnung zu entnehmen ist, weist der gemäß dem erfindungsgemäßen Verfahren zu befüllende Druckmittelspeicher ein Gehäuse 1 auf, dessen Innenraum mittels eines Medientrennungselements 2 in zwei Druckräume bzw. Kammern 3, 4 unterteilt ist. Das Medientrennungselement 2 wird dabei vorzugsweise durch einen dünnwandigen metallischen Faltenbalg gebildet, der einerseits druckdicht mit einem das Gehäuse 1 verschließenden Deckel 8 verbunden ist und andererseits mittels einer Platte 9 verschlossen ist. Der Innenraum des Faltenbalgs 2 bildet die erste Kammer 3, die über einen im Deckel 8 vorgesehenen Füllanschluß 10 mit einem in der Regel unter hohem Druck stehenden Gas befüllt werden kann. Im unteren Teil des Gehäuses 1 ist ein hydraulischer Anschluß 5 ausgebildet, in dem ein Bodenventil 6 angeordnet ist, dessen Schließkörper 7 in die zweite Kammer 4 hineinragt. Das Bodenventil 6 ist dabei vorzugsweise derart ausgelegt, daß es einerseits ein Befüllen der zweiten Kammer 4 mit einem unter Druck stehenden flüssigen Druckmittel, beispielsweise einer Bremsflüssigkeit, ermöglicht und andererseits ein vollständiges Entleeren der zweiten Kammer 4 verhindert. Außerdem befindet sich in der ersten Kammer 3 eine Druckfeder 11, die zwischen
dem Deckel 8 und der vorhin erwähnten Platte 9 eingespannt ist und somit den Faltenbalg 2 in Richtung auf das Bodenventil 6 zu vorspannt. Dadurch wird gewährleistet, daß der in der zweiten Kammer 4 herrschende hydraulische Druck immer höher ist als der in der ersten Kammer 3 herrschende Gasdruck.As can be seen from the drawing, the pressure medium reservoir to be filled according to the method according to the invention has a housing 1 whose interior is subdivided by means of a media separation element 2 into two pressure chambers or chambers 3, 4. The media separation element 2 is preferably formed by a thin-walled metallic bellows, on the one hand pressure-tight manner with a lid 8 closing the housing 1 and on the other hand is closed by a plate 9. The interior of the bellows 2 forms the first chamber 3, which can be filled via a filling connection 10 provided in the cover 8 with a gas which is generally under high pressure. In the lower part of the housing 1, a hydraulic port 5 is formed, in which a bottom valve 6 is arranged, the closing body 7 protrudes into the second chamber 4. The bottom valve 6 is preferably designed such that it on the one hand allows filling of the second chamber 4 with a pressurized fluid pressure medium, such as a brake fluid, and on the other hand prevents complete emptying of the second chamber 4. In addition, located in the first chamber 3, a compression spring 11, the between
the cover 8 and the aforementioned plate 9 is clamped and thus biases the bellows 2 in the direction of the bottom valve 6. This ensures that the pressure prevailing in the second chamber 4 hydraulic pressure is always higher than that prevailing in the first chamber 3 gas pressure.

Außerdem ist in der mit Gas gefüllten ersten Kammer 3 eine Sensoreinrichtung zum Sensieren der Bewegung des Medientrennungselements 2 vorgesehen, die mit dem Bezugszeichen 12 versehen ist. Die Sensoreinrichtung 12, die beispielsweise als ein induktiver Wegsensor ausgebildet sein kann, stellt eine selbständig handhabbare Baugruppe dar, die in eine im Deckel 8 vorgesehene Öffnung einsetzbar ist.In addition, a sensor device for sensing the movement of the media separation element 2, which is provided with the reference numeral 12, is provided in the gas-filled first chamber 3. The sensor device 12, which may be formed, for example, as an inductive displacement sensor, is an independently manageable assembly, which can be used in an opening provided in the lid 8.

In der Zeichnung ist weiterhin schematisch eine Vorrichtung dargestellt, die dem Befüllen des vorhin beschriebenen Druckmittelspeichers mit entsprechenden Druckmedien dient. Die gezeigte Vorrichtung besteht im wesentlichen aus folgenden Bestandteilen:

  • a) einer ersten Leitung 13, die einerseits an die vorhin erwähnte erste Kammer 3 und andererseits an eine nicht dargestellte Druckgasquelle angeschlossen wird,
  • b) einer zweiten Leitung 14, die einerseits an die vorhin erwähnte zweite Kammer 4 und andererseits entweder an eine nicht dargestellte Druckmittelquelle oder eine Unterdruckquelle 15 angeschlossen wird,
  • c) einer Einrichtung 16 zum mechanischen Öffnen bzw. Offenhalten des Bodenventils 6, die in den vorhin erwähnten hydraulischen Anschluß 5 einführbar ist, und
  • d) jeweils einem der Druckmittelquelle sowie der Unterdruckquelle 15 zugeordneten, in der zweiten Leitung 14 eingefügten Absperrventil 17, 18.
In the drawing, a device is also shown schematically, which serves to fill the previously described pressure medium reservoir with appropriate pressure media. The device shown consists essentially of the following components:
  • a) a first line 13, which is connected on the one hand to the above-mentioned first chamber 3 and on the other hand to a compressed gas source, not shown,
  • b) a second line 14 which is connected on the one hand to the previously mentioned second chamber 4 and on the other hand either to a pressure medium source, not shown, or a vacuum source 15,
  • c) means 16 for mechanically opening or keeping open the bottom valve 6, which is insertable into the aforementioned hydraulic connection 5, and
  • d) each one of the pressure medium source and the negative pressure source 15 associated, inserted in the second line 14 shut-off valve 17, 18th

Dabei ist es sinnvoll, einen ersten Drucksensor 19 zur Überwachung des Druckmittelfülldrucks, einen zweiten Drucksensor 20 zur Überwachung des Niveaus des von der Unterdruckquelle 15 aufgebrachten Unterdrucks sowie einen Wegsensor 21 zur Überwachung der Bewegung der Einrichtung 16 zum mechanischen Öffnen bzw. Offenhalten des Bodenventils 6 vorzusehen.It is useful here to provide a first pressure sensor 19 for monitoring the pressure medium filling pressure, a second pressure sensor 20 for monitoring the level of the negative pressure applied by the negative pressure source 15, and a displacement sensor 21 for monitoring the movement of the device 16 for mechanically opening or keeping the bottom valve 6 open ,

Vor dem Beginn des nachfolgend erläuterten Füllvorgangs wird angenommen, daß sich die vorhin erwähnte Platte 9 unter der Wirkung der Druckfeder 11 an einem ersten Anschlag (beispielsweise am Boden des Gehäuses 1) befindet und daß das Bodenventil 6 geschlossen ist. Diesem Ausgangszustand entspricht ein Signalwert des Wegsensors 12, der ermittelt und abgelegt wird. Der ermittelte Signalwert wird später im Betrieb benutzt, um Defekte am Bodenventil 6 zu erkennen. Um die gleiche Wirkung bei einer Ausführung ohne die vorhin genannte Druckfeder 11 zu erzielen wird die erste Kammer 3 mit niedrigem Druck (z. B. mit Preßluft bis 2 bar) beaufschlagt.Before the start of the filling process explained below, it is assumed that the previously mentioned plate 9 is under the action of the compression spring 11 at a first stop (for example, at the bottom of the housing 1) and that the bottom valve 6 is closed. This output state corresponds to a signal value of the displacement sensor 12, which is determined and stored. The determined signal value is later used in operation to detect defects on the bottom valve 6. In order to achieve the same effect in an embodiment without the above-mentioned compression spring 11, the first chamber 3 is acted upon with low pressure (eg with compressed air up to 2 bar).

Nachdem die Einrichtung 16, die beispielsweise als ein metallischer Stift ausgeführt sein kann, das Bodenventil 6 geöffnet hatte, wird die zweite Leitung 14 durch Öffnen des zugeordneten Absperrventils 18 mit der Unterdruckquelle 15 verbunden und die zweite Kammer 4 evakuiert. Nach dem Evakuieren wird die zweite Kammer 4 mit einem dafür vorgesehenen Druckmittel, vorzugsweise einer Bremsflüssigkeit, unter niedrigem Druck vollständig befüllt, wobei der Faltenbalg 2 um einen geringen Betrag zusammengedrückt wird. Anschließend bewirkt die Druckfeder 11 bzw. der in der ersten Kammer 3 wirkende Gasdruck ein langsames Ausströmen des überschüssigen Druckmittelvolumens bis zum Schließen des Bodenventils 6. Da der Schließkörper 7 des Bodenventils, die den Faltenbalg 2 verschließende Platte 9 und der Wegsensor 12 miteinender in Kontakt stehen, kann der Signalwert des Wegsensors 12, bei dem das Bodenventil 6 schließt, ermittelt und abgelegt werden.After the device 16, which may for example be designed as a metallic pin, the bottom valve 6 had opened, the second line 14 is connected by opening the associated shut-off valve 18 to the vacuum source 15 and the second chamber 4 evacuated. After evacuation, the second chamber 4 is provided with a pressure medium provided for this purpose, preferably a brake fluid, completely filled under low pressure, wherein the bellows 2 is compressed by a small amount. The pressure spring 11 or the gas pressure acting in the first chamber 3 then causes a slow outflow of the excess pressure medium volume until the bottom valve 6 closes. Since the closing body 7 of the bottom valve, the plate 9 closing the bellows 2 and the displacement sensor 12 are in contact with each other , the signal value of the displacement sensor 12, at which the bottom valve 6 closes, can be determined and stored.

Nun wird ein definiertes Druckmittelvolumen nachgefüllt, das den systembedingten Mindestanforderungen entspricht und das z. B. den Volumenwert darstellt, der bei der Temperatur 120 °C eine einwandfreie Funktion des Druckmittelspeichers gewährleistet. Dadurch erfolgt ein Zusammendrücken des Faltenbalgs 2 bzw. eine Bewegung der ihn verschließenden Platte 9 nach oben in eine definerte Position, der ein dritter Signalwert des Wegsensors 12 entspricht. Der Signalwert wird wiederum ermittelt und abgespeichert.Now, a defined pressure medium volume is refilled, which corresponds to the system-related minimum requirements and the z. B. represents the volume value, which ensures a perfect function of the accumulator at the temperature of 120 ° C. As a result, the bellows 2 is compressed or a movement of the plate 9 closing it up into a defined position, which corresponds to a third signal value of the displacement sensor 12. The signal value is again determined and stored.

Danach wird Druckmittel so lange nachgefüllt, bis die Platte 9 einen nicht gezeigten, beispielsweise in der ersten Kammer 3 angeordneten mechanischen Anschlag erreicht. Dieser oberen Position des (zusammengedrückten) Faltenbalges 2 entspricht wieder ein Signalwert des Wegsensors 12, der ermittelt und abgelegt wird. Der erwähnte Signalwert ist besonders dafür geeignet, ein Zerstören des Faltenbalges 2 zu verhindern. Nach dem Erfassen des der oberen Position entsprechenden Signalwertes wird das nachgefüllte Druckmittelvolumen wieder so lange entnommen, bis die durch das Nachfüllen des definierten Druckmittelvolumens eingestellte Position erreicht ist. In dieser Position erfolgt über die erste Leitung 13 ein Befüllen der ersten Kammer 3 mit geeignetem Gas, wonach der vorhin erwähnte Füllanschluß 10 verschlossen wird. Danach wird das im Speicher verbliebene Druckmittel so lange entnommen, bis das Bodenventil 6 schließt. Damit ist der Füllvorgang beendet und der Speicher mit den ermittelten Signalwerten kann ausgeliefert werden.Thereafter, pressure medium is refilled until the plate 9 reaches a not shown, arranged for example in the first chamber 3 mechanical stop. This upper position of the (compressed) bellows 2 again corresponds to a signal value of the displacement sensor 12, which is determined and stored. The mentioned signal value is particularly suitable for preventing destruction of the bellows 2. After detecting the signal value corresponding to the upper position, the filled-in pressure medium volume is withdrawn again until the position set by the refilling of the defined pressure medium volume has been reached. In this position, via the first line 13, a filling of the first chamber 3 with suitable gas, after which the previously mentioned filling connection 10 is closed. Thereafter, the pressure medium remaining in the memory is removed until the bottom valve 6 closes. This completes the filling process and the memory with the determined signal values can be delivered.

Claims (9)

  1. Method of filling a pressure medium accumulator with a housing (1) having an inner space that is subdivided into two chambers (3, 4) by a metallic pleated bellows (2) used as a media-separating element, the first chamber (3) thereof being filled with a gas and the second chamber (4) being filled with a liquid pressure medium, and wherein a bottom valve (6) is provided in a hydraulic port (5), its closing member (7) being operable by the media-separating element (2), said valve permitting filling of the second chamber (4) with pressure medium and preventing a complete evacuation of the second chamber (4),
    characterized in that the filling operation is carried out by the following process steps:
    a) evacuation of the second chamber (4)
    b) filling of the second chamber (4) with a defined pressure medium which corresponds to the system requirements for a defined temperature,
    c) filling a previously calculated volume of gas into the first chamber (3), further
    characterized in that the distance covered by the pleated bellows (2) is sensed when the second chamber (4) is filled with the defined pressure medium volume.
  2. Method as claimed in claim 1,
    characterized in that, while the condition of the bottom valve (6) is simultaneously sensed, pressure medium is taken from the second chamber (4) in a controlled manner until the closed condition of the bottom valve (6) has been reached.
  3. Method as claimed in claim 1 or 2,
    characterized in that the second chamber (4) is filled with pressure medium until a stop for the pleated bellows (2) is reached, with the distance covered by the pleated bellows (2) being sensed.
  4. Method as claimed in any one of claims 1 to 3,
    characterized in that before the second chamber (4) is filled with pressure medium, the pleated bellows (2) is moved into abutment on a second stop, with the distance covered by the pleated bellows (2) being sensed.
  5. Method as claimed in claim 4,
    characterized in that the pleated bellows (2) is moved into abutment on the second stop by the effect of a pneumatic pressure.
  6. Device for filling a pressure medium accumulator with a housing (1) having an inner space that is subdivided into two chambers (3, 4) by a metallic pleated bellows (2) used as a media-separating element, the first chamber (3) thereof being filled with a gas and the second chamber (4) being filled with a liquid pressure medium, and wherein a bottom valve (6) is provided in a hydraulic port (5), its closing member (7) being operable by the media-separating element (2), said valve permitting filling of the second chamber (4) with pressure medium and preventing a complete evacuation of the second chamber (4), there being means for evacuating the second chamber (4), means for filling the second chamber (4) with pressure medium, as well as means for filling the gas into the first chamber (3), and wherein a first supply line (13) is provided that can be connected to the first chamber (3) and is used for the gas supply, and a second supply line (14) that can be connected to the second chamber (4) and is adapted to communicate alternatively with a pressure medium source or a vacuum source (15),
    characterized in that it includes a mechanism (16) for opening the bottom valve (6) or for keeping it open.
  7. Device as claimed in claim 6,
    characterized in that a pressure sensor (19) is provided to determine the pressure medium filling pressure that prevails in the second supply line (14) when the second chamber (4) is filled.
  8. Device as claimed in claim 6 or 7,
    characterized in that a vacuum sensor (20) is provided to determine the vacuum produced by the vacuum source (15) during evacuation of the second chamber (4).
  9. Device as claimed in any one of claims 6 to 8,
    characterized in that a distance sensor (21) is provided to determine the position of the closing member (7) of the bottom valve (6).
EP01986568A 2000-10-11 2001-10-09 Method for filling a hydraulic accumulator and device for carrying out said method Expired - Lifetime EP1327080B1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE10050505 2000-10-11
DE10050505 2000-10-11
DE10139811 2001-08-14
DE10139811A DE10139811A1 (en) 2000-10-11 2001-08-14 Method for filling a pressure medium reservoir and device for carrying out the method
PCT/EP2001/011679 WO2002031362A2 (en) 2000-10-11 2001-10-09 Method for filling a printing ink reservoir and device for carrying out said method

Publications (2)

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EP1327080A2 EP1327080A2 (en) 2003-07-16
EP1327080B1 true EP1327080B1 (en) 2006-06-21

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US (1) US6845793B2 (en)
EP (1) EP1327080B1 (en)
JP (1) JP4213464B2 (en)
DE (1) DE50110282D1 (en)
WO (1) WO2002031362A2 (en)

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Also Published As

Publication number Publication date
EP1327080A2 (en) 2003-07-16
JP4213464B2 (en) 2009-01-21
WO2002031362A2 (en) 2002-04-18
JP2004511729A (en) 2004-04-15
US20040020552A1 (en) 2004-02-05
US6845793B2 (en) 2005-01-25
WO2002031362A3 (en) 2003-01-30
DE50110282D1 (en) 2006-08-03

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