WO1991004420A1 - Pressure medium reservoir, especially for vehicle braking systems - Google Patents

Pressure medium reservoir, especially for vehicle braking systems Download PDF

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Publication number
WO1991004420A1
WO1991004420A1 PCT/DE1990/000583 DE9000583W WO9104420A1 WO 1991004420 A1 WO1991004420 A1 WO 1991004420A1 DE 9000583 W DE9000583 W DE 9000583W WO 9104420 A1 WO9104420 A1 WO 9104420A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
gas
pressure medium
space
check valve
Prior art date
Application number
PCT/DE1990/000583
Other languages
German (de)
French (fr)
Inventor
Heinz Siegel
Klaus Müller
Original Assignee
Robert Bosch 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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO1991004420A1 publication Critical patent/WO1991004420A1/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
    • F15B1/24—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with rigid separating means, e.g. pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/20—Accumulator cushioning means
    • F15B2201/205—Accumulator cushioning means using gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/30—Accumulator separating means
    • F15B2201/31—Accumulator separating means having rigid separating means, e.g. pistons
    • F15B2201/312—Sealings therefor, e.g. piston rings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/40—Constructional details of accumulators not otherwise provided for
    • F15B2201/41—Liquid ports
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/40—Constructional details of accumulators not otherwise provided for
    • F15B2201/415—Gas ports
    • F15B2201/4155—Gas ports having valve means

Definitions

  • Pressure fluid accumulator in particular for vehicle brake systems
  • the invention relates to a pressure medium accumulator according to the preamble of the main claim.
  • Such a pressure medium accumulator is already known (DE-OS 25 13 846, FIG. 1), in which the collecting space of the separating piston located between the piston sealing rings is connected to a telescopic inner tube of the accumulator via several radially running bores. This is attached to the mounting flange of the pressure fluid accumulator. A bore penetrating the flange of the accumulator is connected to a collecting element. Hydraulic fluid emerging from the pressure medium storage space after overcoming the adjacent seal of the separating piston is collected in the collecting space and discharged from the reservoir through the radial bores, the inner tube and the flange-side bore. Compressed gas escaping from the gas space after overcoming the other separating piston seal can also leave the reservoir in this way.
  • the pressure medium accumulator according to the invention with the characterizing features of the main claim has the advantage, in particular, that during a loading process of the accumulator with pressure medium from the gas space penetrating into the collecting space and also fluid carried in by the stroke movement of the piston during a discharge process of the accumulator into the gas space is returned.
  • a pressure builds up in the collecting space which is above the precharge pressure of the compressed gas in the gas space. If the pressure in the gas space drops to the precharge pressure when the storage medium is discharged from the pressure medium, the check valve opens due to the pressure difference between the collecting space and the gas space and clears the way for the return of the pressure gas (and the liquid carried in) .
  • the service life of the pressure medium accumulator is thus considerably extended without any significant additional design effort, since on the one hand - as is known - a double seal is used and on the other hand a prolonged build-up of pressure between the seals and its negative effect on the service life is prevented.
  • the installation space of the pressure medium reservoir is hardly enlarged, since the check valve required can be made very small.
  • check valve that can be produced with simple means and is easy to assemble on the separating piston is achieved.
  • expedient embodiments of check valves are disclosed, which consist of a few, small-sized components and therefore only reduce the volume of the gas space to a small extent.
  • the embodiment of the check valve specified in claim 5 even has only one component lying in the wall cross section of the separating piston, which has the function of a closing element and a spring element pressing the closing element against its valve seat.
  • the embodiment is therefore characterized by a very simple structure and easy assembly and small space requirements.
  • FIG. 1 shows a longitudinal section of a pressure medium accumulator with a separating piston, which has a check valve on the gas chamber side as the first exemplary embodiment
  • FIGS. 2 and 3 show a longitudinal section through separating pistons with further embodiments of non-return valves.
  • the pressure medium reservoir designated by 10 in FIG. 1 of the drawing, has a cylinder 11. This is tightly screwed into a lower storage part 12. A separating piston 13 is guided longitudinally displaceably within the cylinder 11. The separating piston 13 separates an (upper) gas space 14 from a (lower) pressure medium storage space 15. The gas space 14 is not by means of a Filling valve shown filled with a predetermined pressure (precharge pressure) having compressed gas.
  • the separating piston 13 is provided with two sealing rings 20 and 21 arranged axially at a distance from the piston circumference. These are intended to ensure that neither gas from the gas space 14 nor brake fluid can escape from the pressure medium storage space 15. Since the material of the piston sealing rings 20 and 21 is not completely impermeable to gas and brake fluid overcomes the sealing rings to a small extent during stroke movements of the separating piston 13, this is only incompletely possible. The gas loss from the gas space 14 is the more serious problem because this limits the life of the pressure medium accumulator 10. To remedy this defect, the following measures are taken on the separating piston 13 according to the invention:
  • the separating piston 13 has on its outer circumference in the area between the two piston sealing rings 20 and 21 a groove-shaped collecting space 22. From this extends a bore 23 which runs radially in the piston 13 and which is preceded by a filter 24 arranged in the collecting space 22 for collecting seal abrasion.
  • the bore 23 opens into the gas space 14 which is cup-shaped by a cylindrical recess 25 of the separating piston 13.
  • the bore 23 merges into a conical valve seat 26 of a check valve 27.
  • a ball 28 acts on the valve seat 26 as the closing element of the check valve 27.
  • the ball 28 is loaded against the valve seat 26 by a compression spring 29 and held on the separating piston 13 by a bracket 30.
  • the collecting space 22 serves to hold gas which, when the pressure medium storage space 15 is empty, the piston sealing ring 20 due to the precharge pressure in the gas space 14 overcomes.
  • empty pressure medium storage space 15 means that the separating piston 13 is in its lower position shown.
  • brake fluid is absorbed in the pressure medium storage space 15
  • the separating piston 13 in the cylinder 11 of the pressure medium accumulator 10 is shifted upward, resulting in a leads to a considerable increase in the pressure in the gas space 14.
  • a pressure rise in the collecting space 22 also occurs due to the penetration of gas and the introduction of brake fluid. Subsequent emptying of the pressure medium storage space 15 causes the gas in the gas space 14 to expand, possibly down to the precharge pressure.
  • the resulting pressure drop between the collecting chamber 22 and the gas chamber 14 causes the check valve 27 to open, so that gas and a small amount of brake fluid can flow through the bore 23 into the gas chamber.
  • the gas portion escaping from the gas space 14 is thereby largely returned.
  • the check valve 27 blocks the backflow of compressed gas from the gas space 14 into the collecting space 22.
  • the separating pistons shown in the two FIGS. 2 and 3 differ from those in FIG. 1 essentially by different embodiments of the check valve.
  • the assignment of the respective separating piston to the gas space 14 and to the pressure medium storage space 15 is indicated by entering the corresponding reference numbers in the drawing.
  • the separating piston 13.1 shown in FIG. 2 has a check valve 27.1 with a rubber plate 33 as a closing member.
  • the rubber plate 33 is assigned the groove base of a groove 35 which is pierced on the inner circumference of the recess 25.1 of the separating piston 13.1.
  • the bore 23.1 emanating from the collecting space 22.1 opens into the valve seat 34 of the check valve 27.1.
  • the rubber plate 33 is also loaded against the valve seat 34 with a compression spring 29.1 supported by a bracket 30.1.
  • a pierced groove 38 in which a ring 39 made of a rubber-elastic material and designed as a closing member of the check valve 27.2 is located.
  • the ring 39 is provided on both sides against the groove flanks 40 with radially extending openings 41 for the gas passage.
  • the ring 39 is tapered in cross section against the groove base 42. It is supported circumferentially on an area of the groove base 42, which serves as a valve seat 43 of the check valve 27.2 and into which the bore 23.2 of the separating piston 13.2 opens. Since the ring 39 rests under prestress on the valve seat 43 due to its inherent elasticity, a compression spring is not necessary in this embodiment of the check valve 27.2.

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

Abstract

The reservoir (10) has a cylinder (11) and a separating piston (13) arranged to slide therein. The piston separates a pressure medium storage chamber (15) from a gas chamber (14) in the cylinder (11). The separating piston (13) is sealed against the cylinder (11) by at least two rings (20 and 21) arranged at a distance apart axially on the periphery of the piston. Between the piston rings (20 and 21) is a collection chamber (22) from which opens a drilling (23) in the piston (13). The drilling (23) opens into the gas chamber (14) and can be closed off by a return valve blocking the passage from the gas chamber into the collection chamber (22). When the storage chamber (15) is emptied, pressurised gas and liquid conveyed with it from the gas chamber (14) into the collection chamber (22) are fed back into the gas chamber (14) via the drilling (23) on the opening of the return valve (27) as a result of being allowed to pass through the piston ring (20) on the gas chamber side. This lengthens the useful life of the pressure medium reservoir (10).

Description

Druckmittelspeicher, insbesondere für Fahrzeuσ-Bremsanlacren Pressure fluid accumulator, in particular for vehicle brake systems
Stand der TechnikState of the art
Die Erfindung geht aus von einem Druckmittelspeicher nach der Gattung des Hauptanspruchs.The invention relates to a pressure medium accumulator according to the preamble of the main claim.
Es ist schon ein solcher Druckmittelspeicher bekannt (DE-OS 25 13 846, Fig. 1), bei dem der zwischen den Kolbendichtungs¬ ringen liegende Auffangraum des Trennkolbens über mehrere radial verlaufende Bohrungen mit einem teleskopartig ausgebildeten Innen¬ rohr des Speichers in Verbindung steht. Dieses ist am Montageflansch des Druckmittelspeichers befestigt. Eine den Flansch des Speichers durchdringende Bohrung steht mit einem Auffangorgan in Verbindung. Aus dem Druckmittelspeicherraum nach Überwindung der angrenzenden Dichtung des Trennkolbens austretende Hydraulikflüssigkeit wird im Auffangraum gesammelt und durch die radial verlaufenden Bohrungen, das Innenrohr und die flanschseitige Bohrung aus dem Speicher abge¬ führt. Aber auch aus dem Gasraum nach Überwindung der anderen Trenn- kolbendichtung entwichenes Druckgas kann auf diesem Weg den Speicher verlassen. Bei Druckmittelspeichern, wie sie in Fahrzeug-Bremsanlagen mit Blockierschutz-Einrichtungen verwendet werden, kann der Gasverlust aus dem Gasraum des Speichers dessen Lebensdauer erheblich ver¬ kürzen. Dieser durch den Werkstoff der Kolbendichtungsringe ver¬ ursachte Gasverlust läßt sich nicht unterbinden, weil die Eigen¬ schaften der Bremsflüssigkeit Einschränkungen bei der Wahl des Dichtungswerkstoffes bedingen.Such a pressure medium accumulator is already known (DE-OS 25 13 846, FIG. 1), in which the collecting space of the separating piston located between the piston sealing rings is connected to a telescopic inner tube of the accumulator via several radially running bores. This is attached to the mounting flange of the pressure fluid accumulator. A bore penetrating the flange of the accumulator is connected to a collecting element. Hydraulic fluid emerging from the pressure medium storage space after overcoming the adjacent seal of the separating piston is collected in the collecting space and discharged from the reservoir through the radial bores, the inner tube and the flange-side bore. Compressed gas escaping from the gas space after overcoming the other separating piston seal can also leave the reservoir in this way. In the case of pressure fluid accumulators, such as those used in vehicle brake systems with anti-lock devices, the gas loss from the gas space of the accumulator can shorten its service life considerably. This gas loss caused by the material of the piston sealing rings cannot be prevented because the properties of the brake fluid impose restrictions on the choice of the sealing material.
Vorteile der ErfindungAdvantages of the invention
Der erfindungsgemäße Druckmittelspeicher mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß ins¬ besondere bei einem Ladevorgang des Speichers mit Druckmittel aus dem Gasraum in den Auffangraum eingedrungenes Druckgas und auch durch die Hubbewegung des Kolbens eingeschleppte Flüssigkeit bei einem Entladevorgang des Speichers in den Gasraum zurückgeführt wird. Bei geladenem Speicher baut sich nämlich im Auffangraum ein Druck auf, der über dem Vorladedruck des Druckgases im Gasraum liegt. Wenn beim Entladen des Speichers vom Druckmittel der Druck im Gasraum gegebenenfalls bis auf den Vorladedruck absinkt, öffnet das Rückschlagventil aufgrund der Druckdifferenz zwischen dem Auffang¬ raum und dem Gasraum und gibt den Weg für die Rückführung des Druck¬ gases (und der eingeschleppten Flüssigkeit) frei. Die Lebensdauer des Druckmittelspeichers ist somit ohne nennenswerten konstruktiven Mehraufwand erheblich verlängert, da einerseits - wie bekannt - eine Doppeldichtung verwendet und andererseits ein längere Zeit anhal¬ tender Druckaufbau zwischen den Dichtungen und dessen Negativauswir¬ kung auf die Lebensdauer verhindert wird. Außerdem wird der Einbau¬ raum des Druckmittelspeichers kaum vergrößert, da das erforderliche Rückschlagventil sehr klein ausgebildet sein kann.The pressure medium accumulator according to the invention with the characterizing features of the main claim has the advantage, in particular, that during a loading process of the accumulator with pressure medium from the gas space penetrating into the collecting space and also fluid carried in by the stroke movement of the piston during a discharge process of the accumulator into the gas space is returned. When the accumulator is loaded, a pressure builds up in the collecting space which is above the precharge pressure of the compressed gas in the gas space. If the pressure in the gas space drops to the precharge pressure when the storage medium is discharged from the pressure medium, the check valve opens due to the pressure difference between the collecting space and the gas space and clears the way for the return of the pressure gas (and the liquid carried in) . The service life of the pressure medium accumulator is thus considerably extended without any significant additional design effort, since on the one hand - as is known - a double seal is used and on the other hand a prolonged build-up of pressure between the seals and its negative effect on the service life is prevented. In addition, the installation space of the pressure medium reservoir is hardly enlarged, since the check valve required can be made very small.
Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vor¬ teilhafte Weiterbildungen und Verbesserungen des im Hauptanspruch angegebenen Druckmittelspeichers möglich.The measures listed in the subclaims enable advantageous further developments and improvements of the pressure medium reservoir specified in the main claim.
Mit der im Anspruch 2 gekennzeichneten Ausgestaltung wird ein mit einfachen Mitteln herstellbares und am Trennkolben leicht montier¬ bares Rückschlagventil erzielt. In den Ansprüchen 3 und 4 sind zweckmäßige Ausführungsformen von Rückschlagventilen offenbart, welche aus wenigen, klein ausbildbaren Bauteilen bestehen und daher das Volumen des Gasraums nur in geringem Maß vermindern.With the embodiment characterized in claim 2, a check valve that can be produced with simple means and is easy to assemble on the separating piston is achieved. In the claims 3 and 4 expedient embodiments of check valves are disclosed, which consist of a few, small-sized components and therefore only reduce the volume of the gas space to a small extent.
Die im Anspruch 5 angegebene Ausführungsform des Rückschlagventils hat sogar nur ein, im Wandguerschnitt des Trennkolbens liegendes Bauteil, welches die Funktion eines Schließgliedes und eines das Schließglied gegen seinen Ventilsitz drückenden Federelementes hat. Die Ausfuhrungsform zeichnet sich daher durch sehr einfachen Aufbau und leichte Montierbarkeit sowie geringen Raumbedarf aus.The embodiment of the check valve specified in claim 5 even has only one component lying in the wall cross section of the separating piston, which has the function of a closing element and a spring element pressing the closing element against its valve seat. The embodiment is therefore characterized by a very simple structure and easy assembly and small space requirements.
Mit der im Anspruch 6 erwähnten Maßnahme wird das Rückschlagventil vor Dichtungsabrieb geschützt.With the measure mentioned in claim 6, the check valve is protected from seal abrasion.
Zeichnungdrawing
Drei Ausführungsbeispiele der Erfindung sind in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 einen Längsschnitt eines Druckmittel¬ speichers mit einem Trennkolben, welcher gasraumseitig ein Rück¬ schlagventil als erstes Ausführungsbeispiel aufweist, sowie Figuren 2 und 3 einen Längsschnitt durch Trennkolben mit weiteren Ausfüh¬ rungsformen von Rückschlagventilen.Three embodiments of the invention are shown in simplified form in the drawing and explained in more detail in the following description. FIG. 1 shows a longitudinal section of a pressure medium accumulator with a separating piston, which has a check valve on the gas chamber side as the first exemplary embodiment, and FIGS. 2 and 3 show a longitudinal section through separating pistons with further embodiments of non-return valves.
Beschreibung der AusführungsbeispieleDescription of the embodiments
Der in Figur 1 der Zeichnung mit 10 bezeichnete, vertikalachsig an¬ geordnete Druckmittelspeicher weist einen Zylinder 11 auf. Dieser ist in ein Speicherunterteil 12 dicht eingeschraubt. Innerhalb des Zylinders 11 ist ein Trennkolben 13 längsverschiebbar geführt. Der Trennkolben 13 trennt einen (oberen) Gasraum 14 von einem (unteren) Druckmittelspeicherraum 15. Der Gasraum 14 ist mit Hilfe eines nicht dargestellten Füllventils mit einem einen vorbestimmten Druck (Vor¬ ladedruck) aufweisenden Druckgas gefüllt. Der insbesondere für Fahr¬ zeug-Bremsanlagen mit Blockierschutz-Einrichtungen vorgesehene Druckmittelspeicher 10 hat im Speicherunterteil 12 eine Bohrung 16, durch welche Bremsflüssigkeit als Druckmittel in den Druckmittel¬ speicherraum 15 zuführbar oder aus diesem entnehmbar ist.The pressure medium reservoir, designated by 10 in FIG. 1 of the drawing, has a cylinder 11. This is tightly screwed into a lower storage part 12. A separating piston 13 is guided longitudinally displaceably within the cylinder 11. The separating piston 13 separates an (upper) gas space 14 from a (lower) pressure medium storage space 15. The gas space 14 is not by means of a Filling valve shown filled with a predetermined pressure (precharge pressure) having compressed gas. The pressure medium reservoir 10, which is provided in particular for vehicle brake systems with anti-lock devices, has a bore 16 in the lower part 12 of the reservoir through which brake fluid can be fed as pressure medium into the pressure medium storage space 15 or can be removed therefrom.
Der Trennkolben 13 ist mit zwei axial mit Abstand am Kolbenumfang angeordneten Dichtungsringen 20 und 21 versehen. Diese sollen si¬ cherstellen, daß weder Gas aus dem Gasraum 14 noch Bremsflüssig¬ keit aus dem Druckmittelspeicherraum 15 entweichen kann. Da der Werkstoff der Kolbendichtungsringe 20 und 21 nicht völlig gasun¬ durchlässig ist und Bremsflüssigkeit bei Hubbewegungen des Trenn¬ kolbens 13 in geringem Maß die Dichtungsringe überwindet, ist dies nur unvollkommen möglich. Der Gasverlust aus dem Gasraum 14 ist da¬ bei das schwerwiegendere Problem, weil hierdurch die Lebensdauer des Druckmittelspeichers 10 begrenzt wird. Zur Behebung dieses Mangels sind am Trennkolben 13 erfindungsgemäß folgende Maßnahmen getroffen:The separating piston 13 is provided with two sealing rings 20 and 21 arranged axially at a distance from the piston circumference. These are intended to ensure that neither gas from the gas space 14 nor brake fluid can escape from the pressure medium storage space 15. Since the material of the piston sealing rings 20 and 21 is not completely impermeable to gas and brake fluid overcomes the sealing rings to a small extent during stroke movements of the separating piston 13, this is only incompletely possible. The gas loss from the gas space 14 is the more serious problem because this limits the life of the pressure medium accumulator 10. To remedy this defect, the following measures are taken on the separating piston 13 according to the invention:
Der Trennkolben 13 weist an seinem Außenumfang im Bereich zwischen den beiden Kolbendichtungsringen 20 und 21 einen nutförmig ausgebil¬ deten Auffangraum 22 auf. Von diesem geht eine im Kolben 13 radial verlaufende Bohrung 23 aus, der ein im Auffangraum 22 angeordneter Filter 24 zum Auffangen von Dichtungsabrieb vorgesetzt ist. Die Boh¬ rung 23 mündet in den durch eine zylindrische Ausnehmung 25 des Trennkolbens 13 topfförmig begrenzten Gasraum 14. Gasraumseitig geht die Bohrung 23 in einen kegelförmig ausgebildeten Ventilsitz 26 ei¬ nes Rückschlagventiles 27 über. Am Ventilsitz 26 greift eine Kugel 28 als Schließglied des Rückschlagventiles 27 an. Die Kugel 28 ist durch eine Druckfeder 29 gegen den Ventilsitz 26 belastet und mit einem Bügel 30 am Trennkolben 13 gehalten. Der Auffangraum 22 dient zur Aufnahme von Gas, welches bei leerem Druckmittelspeicherraum 15 aufgrund des Vorladedrucks im Gasraum 14 den Kolbendichtungsring 20 überwindet. (Dabei bedeutet leerer Druckmittelspeicherraum 15, daß sich der Trennkolben 13 in seiner dargestellten, unteren Stellung befindet.) Bei der Aufnahme von Bremsflüssigkeit im Druckmittelspei¬ cherraum 15 wird der Trennkolben 13 im Zylinder 11 des Druckmittel¬ speichers 10 nach oben verschoben, was zu einer erheblichen Erhöhung des Druckes im Gasraum 14 führt. Dabei tritt auch ein Druckanstieg im Auffangraum 22 aufgrund des Eindringens von Gas sowie des Ein- schleppens von Bremsflüssigkeit auf. Durch nachfolgendes Entleeren des Druckmittelspeicherraumes 15 kommt es zu einer Entspannung des Gases im Gasraum 14, gegebenenfalls bis auf den Vorladedruck. Das sich hierdurch einstellende Druckgefälle zwischen dem Auffangraum 22 und dem Gasraum 14 bewirkt das Öffnen des Rückschlagventiles 27, so daß Gas und in geringem Maß anfallende Bremsflüssigkeit durch die Bohrung 23 in den Gasraum strömen können. Der aus dem Gasraum 14 entwichene Gasanteil wird hierdurch zum überwiegenden Teil zurückge¬ führt. Dagegen sperrt das Rückschlagventil 27 den Rückstrom von Druckgas aus dem Gasraum 14 in den Auffangraum 22.The separating piston 13 has on its outer circumference in the area between the two piston sealing rings 20 and 21 a groove-shaped collecting space 22. From this extends a bore 23 which runs radially in the piston 13 and which is preceded by a filter 24 arranged in the collecting space 22 for collecting seal abrasion. The bore 23 opens into the gas space 14 which is cup-shaped by a cylindrical recess 25 of the separating piston 13. On the gas space side, the bore 23 merges into a conical valve seat 26 of a check valve 27. A ball 28 acts on the valve seat 26 as the closing element of the check valve 27. The ball 28 is loaded against the valve seat 26 by a compression spring 29 and held on the separating piston 13 by a bracket 30. The collecting space 22 serves to hold gas which, when the pressure medium storage space 15 is empty, the piston sealing ring 20 due to the precharge pressure in the gas space 14 overcomes. (In this case, empty pressure medium storage space 15 means that the separating piston 13 is in its lower position shown.) When brake fluid is absorbed in the pressure medium storage space 15, the separating piston 13 in the cylinder 11 of the pressure medium accumulator 10 is shifted upward, resulting in a leads to a considerable increase in the pressure in the gas space 14. A pressure rise in the collecting space 22 also occurs due to the penetration of gas and the introduction of brake fluid. Subsequent emptying of the pressure medium storage space 15 causes the gas in the gas space 14 to expand, possibly down to the precharge pressure. The resulting pressure drop between the collecting chamber 22 and the gas chamber 14 causes the check valve 27 to open, so that gas and a small amount of brake fluid can flow through the bore 23 into the gas chamber. The gas portion escaping from the gas space 14 is thereby largely returned. In contrast, the check valve 27 blocks the backflow of compressed gas from the gas space 14 into the collecting space 22.
Die in den beiden Figuren 2 und 3 dargestellten Trennkolben unter¬ scheiden sich von demjenigen nach Figur 1 im wesentlichen durch unterschiedlichen Ausführungsformen des Rückschlagventils. Dabei ist die Zuordnung des jeweiligen Trennkolbens zum Gasraum 14 und zum Druckmittelspeicherraum 15 durch Eintragung der entsprechenden Bezugszahlen in der Zeichnung angegeben.The separating pistons shown in the two FIGS. 2 and 3 differ from those in FIG. 1 essentially by different embodiments of the check valve. The assignment of the respective separating piston to the gas space 14 and to the pressure medium storage space 15 is indicated by entering the corresponding reference numbers in the drawing.
Der in Figur 2 dargestellte Trennkolben 13.1 weist ein Rückschlag¬ ventil 27.1 mit einer Gummiplatte 33 als Schließglied auf. Als Ventilsitz 34 ist der Gummiplatte 33 der Nutgrund einer am Innen¬ umfang der Ausnehmung 25.1 des Trennkolbens 13.1 eingestochenen Nut 35 zugeordnet. Die vom Auffangraum 22.1 ausgehende Bohrung 23.1 mün¬ det in den Ventilsitz 34 des Rückschlagventils 27.1. Die Gummiplatte 33 ist ebenfalls wie beim Ausführungsbeispiel nach Figur 1 mit einer durch einen Bügel 30.1 abgestützten Druckfeder 29.1 gegen den Ven¬ tilsitz 34 belastet. Der in Figur 3 wiedergegebene Trennkolben 13.2 hat am Innenumfang seiner zum Gasraum 14 hin offenen zylindrischen Ausnehmung 25.2 eine eingestochene Nut 38, in der ein als Schließglied des Rückschlag¬ ventils 27.2 ausgebildeter Ring 39 aus gummielastischem Werkstoff liegt. Der Ring 39 ist beiderseits gegen die Nutflanken 40 mit radial verlaufenden Durchbrüchen 41 für den Gasdurchtritt versehen. Gegen den Nutgrund 42 ist der Ring 39 im Querschnitt verjüngt. Er stützt sich umfangsseitig an einem Bereich des Nutgrundes 42 ab, der als Ventilsitz 43 des Rückschlagventiles 27.2 dient und in den die Bohrung 23.2 des Trennkolbens 13.2 einmündet. Da der Ring 39 auf¬ grund seiner Eigenelastizität unter Vorspannung am Ventilsitz 43 anliegt, ist bei dieser Ausfuhrungsform des Rückschlagventiles 27.2 eine Druckfeder entbehrlich. The separating piston 13.1 shown in FIG. 2 has a check valve 27.1 with a rubber plate 33 as a closing member. As the valve seat 34, the rubber plate 33 is assigned the groove base of a groove 35 which is pierced on the inner circumference of the recess 25.1 of the separating piston 13.1. The bore 23.1 emanating from the collecting space 22.1 opens into the valve seat 34 of the check valve 27.1. As in the exemplary embodiment according to FIG. 1, the rubber plate 33 is also loaded against the valve seat 34 with a compression spring 29.1 supported by a bracket 30.1. The separating piston 13.2 shown in FIG. 3 has on the inner circumference of its cylindrical recess 25.2 which is open towards the gas space 14, a pierced groove 38 in which a ring 39 made of a rubber-elastic material and designed as a closing member of the check valve 27.2 is located. The ring 39 is provided on both sides against the groove flanks 40 with radially extending openings 41 for the gas passage. The ring 39 is tapered in cross section against the groove base 42. It is supported circumferentially on an area of the groove base 42, which serves as a valve seat 43 of the check valve 27.2 and into which the bore 23.2 of the separating piston 13.2 opens. Since the ring 39 rests under prestress on the valve seat 43 due to its inherent elasticity, a compression spring is not necessary in this embodiment of the check valve 27.2.

Claims

Ansprüche Expectations
1. Druckmittelspeicher (10), insbesondere für Fahrzeug-Bremsanlagen, mit einem Zylinder (11) und einem in diesem verschiebbar geführten Trennkolben (13), welcher einen Druckmittelspeicherraum (15) des Zylinders von einem Gasraum (14) des Zylinders trennt, und mit wenigstens zwei axial mit Abstand am Trennkolbenumfang angeordneten Kolbendichtungsringen (20, 21), zwischen denen sich ein Auffangraum (22) befindet, von dem eine im Trennkolben verlaufende Bohrung (23) ausgeht, dadurch gekennzeichnet, daß die Bohrung (23) in den Gasraum (14) mündet und mit einem den Rückstrom vom Gasraum (14) in den Auf- fangraum (22) sperrenden Rückschlagventil (27) verschließbar ist.1. pressure medium accumulator (10), in particular for vehicle brake systems, with a cylinder (11) and a separating piston (13) slidably guided therein, which separates a pressure medium accumulator space (15) of the cylinder from a gas space (14) of the cylinder, and with at least two piston sealing rings (20, 21) arranged axially at a distance on the circumference of the separating piston, between which there is a collecting space (22) from which a bore (23) extending in the separating piston extends, characterized in that the bore (23) into the gas space ( 14) opens and can be closed with a check valve (27) which blocks the backflow from the gas space (14) into the collecting space (22).
2. Druckmittelspeicher nach Anspruch 1, dadurch gekennzeichnet, daß die Bohrung (23) gasraumseitig in einen Ventilsitz (26) übergeht, an dem ein Schließglied (Kugel 28) des Rückschlagventils (27) mit Vorspannung angreift.2. Pressure fluid accumulator according to claim 1, characterized in that the bore (23) on the gas chamber side merges into a valve seat (26) on which a closing member (ball 28) of the check valve (27) engages with pretension.
3. Druckmittelspeicher nach Anspruch 2, dadurch gekennzeichnet, daß der Ventilsitz (26) des Rückschlagventils (27) kegelförmig aus¬ gebildet ist und mit einer Kugel (28) als Schließglied zusammen¬ wirkt, welche durch eine Druckfeder (29) belastet ist. 3. Pressure fluid accumulator according to claim 2, characterized in that the valve seat (26) of the check valve (27) is conical and cooperates with a ball (28) as a closing member which is loaded by a compression spring (29).
4. Druckmittelspeicher nach Anspruch 2, dadurch gekennzeichnet, daß das Rückschlagventil (27.1) als Schließglied eine Gummiplatte (33) hat, welche unter Angriff einer Druckfeder (29.1) am Ventilsitz (34) abgestützt ist.4. Pressure fluid accumulator according to claim 2, characterized in that the check valve (27.1) as a closing member has a rubber plate (33) which is supported under the action of a compression spring (29.1) on the valve seat (34).
5. Druckmittelspeicher nach Anspruch 1 oder 2, dadurch gekenn¬ zeichnet, daß der Trennkolben (13.2) eine zum Gasraum (14) hin offene, zylindrische Ausnehmung (25.2) mit einer an deren Innen¬ umfang eingestochenen Nut (38) hat, in der ein als Schließglied des Rückschlagventils (27.2) ausgebildeter Ring (39) aus gummi¬ elastischem Werkstoff sitzt, der gegen die Nutflanken (40) mit radial verlaufenden Durchbrüchen (41) versehen ist und am Nutgrund (42) in dem Bereich angreift, in den die Bohrung (23.2) des Trenn¬ kolbens (13.2) einmündet.5. A pressure medium accumulator according to claim 1 or 2, characterized in that the separating piston (13.2) has a cylindrical recess (25.2) which is open towards the gas space (14) and has a groove (38) pierced on its inner circumference, in which a ring (39) formed as a closing member of the check valve (27.2) and made of rubber-elastic material is provided with radial openings (41) against the groove flanks (40) and engages the groove base (42) in the area into which the Bore (23.2) of the separating piston (13.2) opens out.
6. Druckmittelspeicher nach Anspruch 1, dadurch gekennzeichnet, daß ein Filter (24) der Bohrung (23) im Auffangraum (22) vorgeordnet ist. 6. Pressure fluid accumulator according to claim 1, characterized in that a filter (24) of the bore (23) in the collecting space (22) is arranged upstream.
PCT/DE1990/000583 1989-09-13 1990-07-28 Pressure medium reservoir, especially for vehicle braking systems WO1991004420A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19893930556 DE3930556A1 (en) 1989-09-13 1989-09-13 PRINT MEDIA STORAGE, ESPECIALLY FOR VEHICLE BRAKING SYSTEMS
DEP3930556.2 1989-09-13

Publications (1)

Publication Number Publication Date
WO1991004420A1 true WO1991004420A1 (en) 1991-04-04

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Application Number Title Priority Date Filing Date
PCT/DE1990/000583 WO1991004420A1 (en) 1989-09-13 1990-07-28 Pressure medium reservoir, especially for vehicle braking systems

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WO (1) WO1991004420A1 (en)

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CN109322820A (en) * 2018-12-11 2019-02-12 重庆水泵厂有限责任公司 Pump high-temperature buffer device

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DE19633055A1 (en) * 1996-08-19 1998-02-26 Teves Gmbh Alfred Fluid pressure system for vehicle brakes
DE19648168A1 (en) * 1996-11-21 1998-05-28 Teves Gmbh Alfred Compressed gas store for pneumatic braking system
EP0907030A1 (en) * 1997-10-04 1999-04-07 Itt Manufacturing Enterprises, Inc. Accumulator, especially for vehicle brake system
DE10248823A1 (en) * 2002-10-19 2004-05-06 Hydac Technology Gmbh hydraulic accumulator
DE102010043279A1 (en) * 2010-11-03 2012-05-03 Continental Teves Ag & Co. Ohg piston accumulators

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Publication number Priority date Publication date Assignee Title
CN109322820A (en) * 2018-12-11 2019-02-12 重庆水泵厂有限责任公司 Pump high-temperature buffer device

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