EP2397701A2 - Piston accumulator - Google Patents

Piston accumulator Download PDF

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Publication number
EP2397701A2
EP2397701A2 EP20110001989 EP11001989A EP2397701A2 EP 2397701 A2 EP2397701 A2 EP 2397701A2 EP 20110001989 EP20110001989 EP 20110001989 EP 11001989 A EP11001989 A EP 11001989A EP 2397701 A2 EP2397701 A2 EP 2397701A2
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EP
European Patent Office
Prior art keywords
piston
housing
housing wall
accumulator according
sliding layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP20110001989
Other languages
German (de)
French (fr)
Other versions
EP2397701B1 (en
EP2397701A3 (en
Inventor
Thorsten Hillesheim
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.)
Carl Freudenberg KG
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Carl Freudenberg KG
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Filing date
Publication date
Application filed by Carl Freudenberg KG filed Critical Carl Freudenberg KG
Publication of EP2397701A2 publication Critical patent/EP2397701A2/en
Publication of EP2397701A3 publication Critical patent/EP2397701A3/en
Application granted granted Critical
Publication of EP2397701B1 publication Critical patent/EP2397701B1/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
    • 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
    • F15B2201/405—Housings
    • F15B2201/4053—Housings characterised by the material

Definitions

  • the invention relates to a piston accumulator, comprising a housing having a pressure chamber, which is delimited by a housing wall and a piston, wherein the piston is movable relative to the housing, wherein the volume of the pressure chamber is variable and wherein the piston along the housing wall is slidably displaceable.
  • the currently known piston accumulators which are used in the storage technology, have a piston made of aluminum or steel. This piston is used for media separation. In this case, gases of the pressure chamber are separated from hydraulic fluids.
  • the final contour of the known piston is produced in a cutting process.
  • the known piston play a game to the surrounding housing.
  • guide rings are made of polytetrafluoroethylene with a Graphiteinlagerung. These guide rings are relatively expensive and must be mounted separately.
  • the known piston accumulators are therefore relatively expensive and expensive to manufacture.
  • the invention is therefore an object of the invention to provide a piston accumulator, the piston can be easily manufactured and assembled.
  • a piston accumulator of the type mentioned is characterized in that the piston and / or the housing wall is associated with a sliding layer such that the piston is free of guide rings along the housing wall movable.
  • a sliding layer allows to move a piston without guide rings within a housing. It has been concretely recognized that by the action of a sliding layer, the clearance between the lateral surface of the piston and the housing wall can be adjusted such that no guide rings are more necessary, the piston accumulator according to the invention therefore has no associated with the piston Guide rings on. Therefore, the mounting of guide rings is eliminated. Since the piston accumulator according to the invention has no guide rings, its mounting is considerably simplified. The piston accumulator according to the invention can thus be manufactured inexpensively and easily.
  • the piston can be easily equipped with a sliding layer and used in a housing predetermined meetingses.
  • a sliding layer could be formed on the housing wall.
  • a sliding layer on the housing wall allows to compensate for manufacturing tolerances in their manufacture.
  • a sliding layer is formed either only on the piston or only on the housing wall or on the piston and on the housing wall.
  • a seal could be arranged without support ring.
  • a seal surrounding the piston made of an elastomer is used as the seal.
  • the piston could be made of plastic.
  • a piston made of plastic can be produced by a so-called tool-falling method.
  • a plastic piston can be manufactured by a plastic injection molding tool. In this case, the production can be carried out such that the piston already has its final dimensions or its final contour and without further processing is verbaudate.
  • the production of the piston made of plastic allows in particular the setting of a game between the piston and the housing wall, in which no support ring is necessary.
  • the piston accumulator therefore has no support ring associated with the piston.
  • the assembly of the support ring is eliminated.
  • the installation of guide rings is eliminated.
  • the piston accumulator therefore has no guide rings associated with the piston.
  • the sliding layer could be formed integrally and integrally with the piston, namely be formed as a lateral surface of the piston.
  • the sliding properties of the plastic used are used without providing a structurally or structurally separate from the piston sliding layer.
  • the sliding layer is virtually integrated in the plastic and given by its material properties.
  • the piston could be made of a thermosetting plastic.
  • the choice of plastic depends on tribological requirements and the permeation values for the gas within the piston accumulator. Surprisingly, thermosetting plastics have proven to be particularly impervious to the permeation of gases.
  • the piston could be made of a thermoplastic material. Thermoplastics can be easily processed by molding.
  • the piston could be made of aluminum and manufactured by a molding process, in particular by a cold extrusion process.
  • the piston could be made of a metal, preferably an aluminum material.
  • the games between the piston and the housing wall are adjusted so that can be dispensed with guide rings and / or support rings.
  • the tribological properties are optimized by creating a lubricating layer by a surface coating process.
  • the Slip layer can be applied to the piston and / or on the housing wall.
  • the initial contour of the piston can be produced by a callosing process, the final contour being created by a machining process.
  • the housing could be made of plastic. This can save costs and weight.
  • the housing could be made of a thermosetting plastic. As a result, a high gas tightness is realized.
  • the housing could be made of a thermoplastic material. These plastics can be processed without problems under suitable thermal conditions.
  • the housing could be made of steel, aluminum or a plastic.
  • the choice of material depends on its thermal expansion coefficient.
  • aluminum is readily machinable and does not require a burnishing process to achieve gas tightness in the motion seal by suitable methods. Through these process improvements, the housing can be manufactured inexpensively.
  • the piston accumulator described here can advantageously be used wherever stored hydraulic energy has to be made available.
  • the piston accumulator can be used in hydraulic systems of motor vehicles or industrial hydraulic systems.
  • Fig. 1 shows a piston accumulator 1, comprising a housing 2 with a pressure chamber 3, which is bounded by the housing wall 4 and a piston 5, wherein the piston 5 is movable relative to the housing 2, wherein the volume of the pressure chamber 3 is variable and wherein the piston along the housing wall 4 is slidably displaceable.
  • the piston 5 is assigned a sliding layer 6 such that the piston 5 is free of guide rings 7 along the housing wall 4 movable.
  • the piston 5 has no guide rings 7.
  • a piston accumulator 1 of the prior art according to Fig. 2 on the other hand has a piston 5, are attached to the guide rings 7 and a support ring 8 for a seal 9.
  • a seal 9 is arranged without support ring 8.
  • the seal 9 is formed as a sealing ring made of elastomer.
  • the seal 9 is received in a circumferential groove 10 in the piston 5 and is sealingly against the housing wall 4 at.
  • the piston 5 according to Fig. 1 is made of plastic.
  • the sliding layer 6 is formed directly on the piston 5, namely, is integrated in the piston 5.
  • the sliding layer 6 is formed integrally and integrally with the piston 5.
  • the sliding layer 6 is in fact formed as a lateral surface 11 of the piston 5. In this case, the sliding properties of the plastic are utilized without a structurally or structurally separate from the piston 5 sliding layer 6 is provided.
  • the piston 5 is made of a thermosetting plastic.
  • a compressible gas preferably nitrogen is added, which can be compressed by acting on the piston surface 12 hydraulic fluid.
  • the piston 5 When compressing the gas, the piston 5 is moved along the housing wall 4. The piston 5 slides along the housing wall. 4
  • the housing 2 is cup-shaped. It has an open end 13 into which the piston 5 is inserted and secured by a retaining ring 15. At the open end 13, a thread 14 is formed, through which the piston accumulator 1 is screwed as a whole in an existing arrangement can be.
  • the piston accumulator 1 can be used as Pulsationsdämpfier in hydraulic systems of motor vehicles.
  • the piston accumulator 1 can also be used together with a mechatronics, which controls a pressurized oil supply and / or automated transmission.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

The accumulator (1) has a housing (2) with a pressure chamber (3), which is defined by a housing wall (4) and a piston (5). A volume of the pressure chamber is variable. The piston is slidingly displaceable along that housing wall. A lubricating layer (6) is assigned to the piston and/or the housing wall such that the piston is movable along the housing wall. A gasket (9) is arranged at the piston. The piston is made of duroplastic or thermoplastic resin. The lubricating layer is formed integrally with the piston.

Description

Technisches GebietTechnical area

Die Erfindung betrifft einen Kolbenspeicher, umfassend ein Gehäuse mit einer Druckkammer, welche von einer Gehäusewand und einem Kolben begrenzt ist, wobei der Kolben relativ zum Gehäuse beweglich ist, wobei das Volumen der Druckkammer veränderbar ist und wobei der Kolben längs der Gehäusewand gleitend verschiebbar ist.The invention relates to a piston accumulator, comprising a housing having a pressure chamber, which is delimited by a housing wall and a piston, wherein the piston is movable relative to the housing, wherein the volume of the pressure chamber is variable and wherein the piston along the housing wall is slidably displaceable.

Stand der TechnikState of the art

Die derzeit bekannten Kolbenspeicher, die in der Speichertechnik eingesetzt werden, weisen einen Kolben aus Aluminium oder Stahl auf. Dieser Kolben dient der Medientrennung. Hierbei werden Gase der Druckkammer von Hydraulikflüssigkeiten abgetrennt.The currently known piston accumulators, which are used in the storage technology, have a piston made of aluminum or steel. This piston is used for media separation. In this case, gases of the pressure chamber are separated from hydraulic fluids.

Die Endkontur der bekannten Kolben wird in einem spanenden Verfahren erzeugt. Hierbei zeigen die bekannten Kolben ein Spiel zu dem sie umgebenden Gehäuse.The final contour of the known piston is produced in a cutting process. Here, the known piston play a game to the surrounding housing.

Die Lagerung und Führung der bekannten Kolben wird über sogenannte Führungsringe sicher gestellt. Diese Führungsringe bestehen aus Polytetraflourethylen mit einer Graphiteinlagerung. Diese Führungsringe sind relativ teuer und müssen extra montiert werden.The storage and management of the known piston is ensured via so-called guide rings. These guide rings are made of polytetrafluoroethylene with a Graphiteinlagerung. These guide rings are relatively expensive and must be mounted separately.

Des Weiteren wird derzeit zum Schutz eines elastomeren Dichtringes gegen Extrusion ein sogenannter Stützring montiert.Furthermore, currently a so-called support ring is mounted to protect an elastomeric seal against extrusion.

Die bekannten Kolbenspeicher sind daher relativ teuer und aufwändig in der Fertigung.The known piston accumulators are therefore relatively expensive and expensive to manufacture.

Darstellung der ErfindungPresentation of the invention

Der Erfindung liegt daher die Aufgabe zugrunde, einen Kolbenspeicher zu schaffen, dessen Kolben problemlos gefertigt und montiert werden kann.The invention is therefore an object of the invention to provide a piston accumulator, the piston can be easily manufactured and assembled.

Die vorliegende Erfindung löst die zuvor genannte Aufgabe durch die Merkmale des Patentanspruchs 1.The present invention achieves the aforementioned object by the features of patent claim 1.

Danach ist ein Kolbenspeicher der eingangs genannten Art dadurch gekennzeichnet, dass dem Kolben und/ oder der Gehäusewand eine Gleitschicht derart zugeordnet ist, dass der Kolben frei von Führungsringen entlang der Gehäusewand bewegbar ist.Thereafter, a piston accumulator of the type mentioned is characterized in that the piston and / or the housing wall is associated with a sliding layer such that the piston is free of guide rings along the housing wall movable.

Erfindungsgemäß ist erkannt worden, dass eine Gleitschicht erlaubt, einen Kolben ohne Führungsringe innerhalb eines Gehäuses zu verfahren. Dabei ist konkret erkannt worden, dass durch die Wirkung einer Gleitschicht das Spiel zwischen Mantelfläche des Kolbens und der Gehäusewand derart eingestellt werden kann, dass keine Führungsringe mehr notwendig sind, Der erfindungsgemäße Kolbenspeicher weist daher keine dem Kolben zugeordnete Führungsringe auf. Daher entfällt die Montage von Führungsringen. Da der erfindungsgemäße Kolbenspeicher keine Führungsringe aufweist, ist dessen Montage erheblich vereinfacht. Der erfindungsgemäße Kolbenspeicher kann somit kostengünstig und problemlos gefertigt werden.According to the invention it has been recognized that a sliding layer allows to move a piston without guide rings within a housing. It has been concretely recognized that by the action of a sliding layer, the clearance between the lateral surface of the piston and the housing wall can be adjusted such that no guide rings are more necessary, the piston accumulator according to the invention therefore has no associated with the piston Guide rings on. Therefore, the mounting of guide rings is eliminated. Since the piston accumulator according to the invention has no guide rings, its mounting is considerably simplified. The piston accumulator according to the invention can thus be manufactured inexpensively and easily.

Folglich ist die eingangs genannte Aufgabe gelöst.Consequently, the object mentioned above is achieved.

Am Kolben könnte eine Gleitschicht ausgebildet sein. Hierdurch kann der Kolben problemlos mit einer Gleitschicht ausgerüstet und in ein Gehäuse vorgegebenen Maßes eingesetzt werden.On the piston, a sliding layer could be formed. As a result, the piston can be easily equipped with a sliding layer and used in a housing predetermined Maßes.

Vor diesem Hintergrund könnte an der Gehäusewand eine Gleitschicht ausgebildet sein. Eine Gleitschicht an der Gehäusewand erlaubt, Fertigungstoleranzen bei deren Fertigung auszugleichen.Against this background, a sliding layer could be formed on the housing wall. A sliding layer on the housing wall allows to compensate for manufacturing tolerances in their manufacture.

Dabei ist konkret denkbar, dass entweder nur am Kolben oder nur an der Gehäusewand oder am Kolben und an der Gehäusewand eine Gleitschicht ausgebildet ist.It is concretely conceivable that a sliding layer is formed either only on the piston or only on the housing wall or on the piston and on the housing wall.

Am Kolben könnte eine Dichtung ohne Stützring angeordnet sein. Vorzugsweise wird als Dichtung ein den Kolben umgebender Dichtring aus einem Elastomer eingesetzt. Durch geeignete Wahl des Spiels zwischen Mantelfläche des Kolbens und der Gehäusewand wird einer Extrusion des Dichtrings derart entgegengewirkt, dass kein Stützring mehr notwendig ist.On the piston, a seal could be arranged without support ring. Preferably, a seal surrounding the piston made of an elastomer is used as the seal. By a suitable choice of the game between lateral surface of the piston and the housing wall of an extrusion of the sealing ring is counteracted such that no support ring is more necessary.

Der Kolben könnte aus Kunststoff gefertigt sein. Ein Kolben aus Kunststoff ist durch ein sogenanntes werkzeugfallendes Verfahren herstellbar. Des Weiteren kann ein Kolben aus Kunststoff durch ein Kunststoffspritzgießwerkzeug gefertigt werden. Dabei kann die Fertigung derart durchgeführt werden, dass der Kolben bereits seine Endmaße bzw. seine Endkontur aufweist und ohne weitere Bearbeitung verbaufähig ist. Die Fertigung des Kolbens aus Kunststoff erlaubt insbesondere die Einstellung eines Spiels zwischen Kolben und Gehäusewand, bei welchem kein Stützring mehr notwendig ist. Der Kolbenspeicher weist daher keinen dem Kolben zugeordneten Stützring auf. Die Montage des Stützrings entfällt. Des Weiteren entfällt die Montage von Führungsringen. Der Kolbenspeicher weist daher keine dem Kolben zugeordnete Führungsringe auf.The piston could be made of plastic. A piston made of plastic can be produced by a so-called tool-falling method. Furthermore, a plastic piston can be manufactured by a plastic injection molding tool. In this case, the production can be carried out such that the piston already has its final dimensions or its final contour and without further processing is verbaufähig. The production of the piston made of plastic allows in particular the setting of a game between the piston and the housing wall, in which no support ring is necessary. The piston accumulator therefore has no support ring associated with the piston. The assembly of the support ring is eliminated. Furthermore, the installation of guide rings is eliminated. The piston accumulator therefore has no guide rings associated with the piston.

Vor diesem Hintergrund könnte die Gleitschicht einstückig und integral mit dem Kolben ausgebildet sein, nämlich als Mantelfläche des Kolbens ausgebildet sein. Hierdurch werden die Gleiteigenschaften des verwendeten Kunststoffs genutzt, ohne eine vom Kolben strukturell oder baulich getrennte Gleitschicht vorzusehen. Die Gleitschicht ist quasi im Kunststoff integriert und durch dessen Materiafeigenschaften gegeben.Against this background, the sliding layer could be formed integrally and integrally with the piston, namely be formed as a lateral surface of the piston. As a result, the sliding properties of the plastic used are used without providing a structurally or structurally separate from the piston sliding layer. The sliding layer is virtually integrated in the plastic and given by its material properties.

Der Kolben könnte aus einem duroplastischen Kunststoff gefertigt sein. Die Wahl des Kunststoffs hängt von tribologischen Anforderungen und den Permeationswerten für das Gas innerhalb des Kolbenspeichers ab. Überraschend haben sich duroplastische Kunststoffe als besonders dicht gegen die Permeation von Gasen erwiesen.The piston could be made of a thermosetting plastic. The choice of plastic depends on tribological requirements and the permeation values for the gas within the piston accumulator. Surprisingly, thermosetting plastics have proven to be particularly impervious to the permeation of gases.

Der Kolben könnte aus einem thermoplastischen Kunststoff gefertigt sein. Thermoplasten sind problemlos formgebend verarbeitbar.The piston could be made of a thermoplastic material. Thermoplastics can be easily processed by molding.

Der Kolben könnte aus Aluminium gefertigt und durch ein formgebendes Verfahren, insbesondere durch ein Kaltfließpressverfahren hergestellt sein, Der Kolben könnte aus einem Metall, vorzugsweise einem Aluminiummaterial, gefertigt sein. Hierbei werden die Spiele zwischen Kolben und Gehäusewand derart angepasst, dass auf Führungsringe und/oder Stützringe verzichtet werden kann. Die tribologischen Eigenschaften werden optimiert, indem durch ein Oberflächenbeschichtungsverfahren eine Gleitschicht erzeugt wird. Die Gleitschicht kann auf den Kolben und/ oder auf die Gehäusewand aufgebracht werden. Die Anfangskontur des Kolbens kann durch einen Kalifließprozess erzeugt werden, wobei die Endkontur durch ein spanabhebendes Verfahren geschaffen wird.The piston could be made of aluminum and manufactured by a molding process, in particular by a cold extrusion process. The piston could be made of a metal, preferably an aluminum material. Here, the games between the piston and the housing wall are adjusted so that can be dispensed with guide rings and / or support rings. The tribological properties are optimized by creating a lubricating layer by a surface coating process. The Slip layer can be applied to the piston and / or on the housing wall. The initial contour of the piston can be produced by a callosing process, the final contour being created by a machining process.

Das Gehäuse könnte aus Kunststoff gefertigt sein. Hierdurch können Kosten und Gewicht eingespart werden.The housing could be made of plastic. This can save costs and weight.

Insbesondere könnte das Gehäuse aus einem duroplastischen Kunststoff gefertigt sein. Hierdurch wird eine hohe Gasdichtheit realisiert.In particular, the housing could be made of a thermosetting plastic. As a result, a high gas tightness is realized.

Das Gehäuse könnte aus einem thermoplastischen Kunststoff gefertigt sein. Diese Kunststoffe lassen sich bei geeigneten thermischen Bedingungen problemlos formgebend verarbeiten.The housing could be made of a thermoplastic material. These plastics can be processed without problems under suitable thermal conditions.

Das Gehäuse könnte aus Stahl, Aluminium oder einem Kunststoff gefertigt sein. Die Wahl des Werkstoffs hängt von dessen thermischen Ausdehnungskoeffizienten ab. Aluminium ist vorteilhaft schnell zerspanbar und erfordert keinen Rollierprozess zur Erlangung der Gasdichtheit bei der Bewegungsdichtung durch geeignete Verfahren. Durch diese Prozessverbesserungen kann das Gehäuse kostengünstig hergestellt werden.The housing could be made of steel, aluminum or a plastic. The choice of material depends on its thermal expansion coefficient. Advantageously, aluminum is readily machinable and does not require a burnishing process to achieve gas tightness in the motion seal by suitable methods. Through these process improvements, the housing can be manufactured inexpensively.

Der hier beschriebene Kolbenspeicher kann vorteilhaft überall dort eingesetzt werden, wo gespeicherte hydraulische Energie zur Verfügung gestellt werden muss. Insbesondere kann der Kolbenspeicher in hydraulischen Anlagen von Kraftfahrzeugen oder industriellen Hydrauliksystemen verwendet werden.The piston accumulator described here can advantageously be used wherever stored hydraulic energy has to be made available. In particular, the piston accumulator can be used in hydraulic systems of motor vehicles or industrial hydraulic systems.

Es gibt nun verschiedene Möglichkeiten, die Lehre der vorliegenden Erfindung in vorteilhafter Weise auszugestalten und weiterzubilden. Dazu ist einerseits auf die nachgeordneten Ansprüche, andererseits auf die nachfolgende Erläuterung eines bevorzugten Ausführungsbeispiels des erfindungsgemäßen Kolbenspeichers anhand der Zeichnung zu verweisen.There are now various possibilities for designing and developing the teaching of the present invention in an advantageous manner. This is on the one hand to the subordinate claims, on the other hand, the following Explanation of a preferred embodiment of the piston accumulator according to the invention with reference to the drawing.

In Verbindung mit der Erläuterung des bevorzugten Ausführungsbeispiels anhand der Zeichnung werden auch im Allgemeinen bevorzugte Ausgestaltungen und Weiterbildungen der Lehre erläutert.In conjunction with the explanation of the preferred embodiment with reference to the drawing, generally preferred embodiments and developments of the teaching are explained.

Kurzbeschreibung der ZeichnungBrief description of the drawing

In der Zeichnung zeigen

Fig. 1
in einer Schnittzeichnung einen erfindungsgemäßem Kolbenspeicher mit einem Kolben ohne Führungsringe und ohne Stützringe für die Dichtung und
Fig. 2
in einer Schnittzeichnung einen Kolbenspeicher des Stands der Technik, bei welchem der Kolben mit einem Stützring für die Dichtung und mit zwei Führungsringen versehen ist.
In the drawing show
Fig. 1
in a sectional drawing an inventive piston accumulator with a piston without guide rings and without support rings for the seal and
Fig. 2
in a sectional view of a piston accumulator of the prior art, wherein the piston is provided with a support ring for the seal and with two guide rings.

Ausführung der ErfindungEmbodiment of the invention

Fig. 1 zeigt einen Kolbenspeicher 1, umfassend ein Gehäuse 2 mit einer Druckkammer 3, welche von der Gehäusewand 4 und einem Kolben 5 begrenzt ist, wobei der Kolben 5 relativ zum Gehäuse 2 beweglich ist, wobei das Volumen der Druckkammer 3 veränderbar ist und wobei der Kolben 5 längs der Gehäusewand 4 gleitend verschiebbar ist. Fig. 1 shows a piston accumulator 1, comprising a housing 2 with a pressure chamber 3, which is bounded by the housing wall 4 and a piston 5, wherein the piston 5 is movable relative to the housing 2, wherein the volume of the pressure chamber 3 is variable and wherein the piston along the housing wall 4 is slidably displaceable.

Dem Kolben 5 ist eine Gleitschicht 6 derart zugeordnet, dass der Kolben 5 frei von Führungsringen 7 entlang der Gehäusewand 4 bewegbar ist. Der Kolben 5 weist keine Führungsringe 7 auf.The piston 5 is assigned a sliding layer 6 such that the piston 5 is free of guide rings 7 along the housing wall 4 movable. The piston 5 has no guide rings 7.

Ein Kolbenspeicher 1 des Stands der Technik gemäß Fig. 2 hingegen weist einen Kolben 5 auf, an dem Führungsringe 7 und ein Stützring 8 für eine Dichtung 9 angebracht sind.A piston accumulator 1 of the prior art according to Fig. 2 on the other hand has a piston 5, are attached to the guide rings 7 and a support ring 8 for a seal 9.

Am Kolben 5 gemäß Fig. 1 hingegen ist eine Dichtung 9 ohne Stützring 8 angeordnet. Die Dichtung 9 ist als Dichtring aus Elastomer ausgebildet. Die Dichtung 9 ist in einer umlaufenden Nut 10 im Kolben 5 aufgenommen und liegt dichtend an der Gehäusewand 4 an.On the piston 5 according to Fig. 1 however, a seal 9 is arranged without support ring 8. The seal 9 is formed as a sealing ring made of elastomer. The seal 9 is received in a circumferential groove 10 in the piston 5 and is sealingly against the housing wall 4 at.

Der Kolben 5 gemäß Fig. 1 ist aus Kunststoff gefertigt. Die Gleitschicht 6 ist am Kolben 5 unmittelbar ausgebildet, ist nämlich im Kolben 5 integriert. Die Gleitschicht 6 ist dabei einstückig und integral mit dem Kolben 5 ausgebildet. Die Gleitschicht 6 ist nämlich als Mantelfläche 11 des Kolbens 5 ausgebildet. Dabei werden die Gleiteigenschaften des Kunststoffs ausgenutzt, ohne dass eine strukturell oder baulich vom Kolben 5 getrennte Gleitschicht 6 vorgesehen ist.The piston 5 according to Fig. 1 is made of plastic. The sliding layer 6 is formed directly on the piston 5, namely, is integrated in the piston 5. The sliding layer 6 is formed integrally and integrally with the piston 5. The sliding layer 6 is in fact formed as a lateral surface 11 of the piston 5. In this case, the sliding properties of the plastic are utilized without a structurally or structurally separate from the piston 5 sliding layer 6 is provided.

Der Kolben 5 ist aus einem duroplastischen Kunststoff gefertigt.The piston 5 is made of a thermosetting plastic.

In der Druckkammer 3 ist ein kompressibles Gas, vorzugsweise Stickstoff aufgenommen, welches durch eine auf die Kolbenfläche 12 wirkende Hydraulikflüssigkeit komprimiert werden kann. Beim Komprimieren des Gases wird der Kolben 5 längs der Gehäusewand 4 verfahren. Der Kolben 5 gleitet dabei entlang der Gehäusewand 4.In the pressure chamber 3, a compressible gas, preferably nitrogen is added, which can be compressed by acting on the piston surface 12 hydraulic fluid. When compressing the gas, the piston 5 is moved along the housing wall 4. The piston 5 slides along the housing wall. 4

Das Gehäuse 2 ist napfförmig ausgebildet. Es weist ein offenes Ende 13 auf, in welches der Kolben 5 eingesetzt und durch einen Haltering 15 gesichert ist. Am offenen Ende 13 ist ein Gewinde 14 ausgebildet, durch welches der Kolbenspeicher 1 als Ganzes in eine bestehende Anordnung eingeschraubt werden kann. Beispielsweise kann der Kolbenspeicher 1 als Pulsationsdämpfier in Hydraulikanlagen von Kraftfahrzeugen verwendet werden.The housing 2 is cup-shaped. It has an open end 13 into which the piston 5 is inserted and secured by a retaining ring 15. At the open end 13, a thread 14 is formed, through which the piston accumulator 1 is screwed as a whole in an existing arrangement can be. For example, the piston accumulator 1 can be used as Pulsationsdämpfier in hydraulic systems of motor vehicles.

Der Kolbenspeicher 1 kann auch gemeinsam mit einer Mechatronik verwendet werden, welche eine Druckölversorgung und/oder automatisierte Getriebe steuert.The piston accumulator 1 can also be used together with a mechatronics, which controls a pressurized oil supply and / or automated transmission.

Hinsichtlich weiterer vorteilhafter Ausgestaltungen und Weiterbildungen der erfindungsgemäßen Lehre wird einerseits auf den allgemeinen Teil der Beschreibung und andererseits auf die beigefügten Patentansprüche verwiesen.With regard to further advantageous embodiments and developments of the teaching of the invention reference is made on the one hand to the general part of the description and on the other hand to the appended claims.

Claims (12)

Kolbenspeicher (1), umfassend ein Gehäuse (2) mit einer Druckkammer (3), welche von einer Gehäusewand (4) und einem Kolben (5) begrenzt ist, wobei der Kolben (5) relativ zum Gehäuse (2) beweglich ist, wobei das Volumen der Druckkammer (3) veränderbar ist und wobei der Kolben (5) längs der Gehäusewand (4) gleitend verschiebbar ist, dadurch gekennzeichnet, dass dem Kolben (5) und/ oder der Gehäusewand (4) eine Gleitschicht (6) derart zugeordnet ist, dass der Kolben (5) frei von Führungsringen (7) entlang der Gehäusewand (4) bewegbar ist.Piston accumulator (1), comprising a housing (2) with a pressure chamber (3) bounded by a housing wall (4) and a piston (5), the piston (5) being movable relative to the housing (2) the volume of the pressure chamber (3) is variable and wherein the piston (5) along the housing wall (4) is slidably movable, characterized in that the piston (5) and / or the housing wall (4) associated with a sliding layer (6) is that the piston (5) free of guide rings (7) along the housing wall (4) is movable. Kolbenspeicher nach Anspruch 1, dadurch gekennzeichnet, dass am Kolben (5) eine Gleitschicht (6) ausgebildet ist.Piston accumulator according to claim 1, characterized in that on the piston (5) has a sliding layer (6) is formed. Kolbenspeicher nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass an der Gehäusewand (4) eine Gleitschicht (6) ausgebildet ist.Piston accumulator according to claim 1 or 2, characterized in that on the housing wall (4) has a sliding layer (6) is formed. Kolbenspeicher nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass am Kolben (5) eine Dichtung (9) ohne Stützring (8) angeordnet ist.Piston accumulator according to one of claims 1 to 3, characterized in that on the piston (5) a seal (9) without support ring (8) is arranged. Kolbenspeicher nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der Kolben (5) aus Kunststoff gefertigt ist.Piston accumulator according to one of claims 1 to 4, characterized in that the piston (5) is made of plastic. Kolbenspeicher nach Anspruch 5, dadurch gekennzeichnet, dass die Gleitschicht (6) einstückig und integral mit dem Kolben (5) ausgebildet ist, nämlich als Mantelfläche (11) des Kolbens (5) ausgebildet ist.Piston accumulator according to claim 5, characterized in that the sliding layer (6) is formed integrally and integrally with the piston (5), namely as a lateral surface (11) of the piston (5) is formed. Kolbenspeicher nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass der Kolben (5) aus einem duroplastischen Kunststoff gefertigt ist.Piston accumulator according to one of claims 1 to 6, characterized in that the piston (5) is made of a thermosetting plastic. Kolbenspeicher nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass der Kolben (5) aus einem thermoplastischen Kunststoff gefertigt ist.Piston accumulator according to one of claims 1 to 6, characterized in that the piston (5) is made of a thermoplastic material. Kolbenspeicher nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der Kolben (5) aus Aluminium gefertigt und durch ein formgebendes Verfahren hergestellt ist.Piston accumulator according to one of claims 1 to 4, characterized in that the piston (5) is made of aluminum and produced by a molding process. Kolbenspeicher nach Anspruch 9, dadurch gekennzeichnet, dass der Kolben (5) aus Aluminium gefertigt und durch ein Kaltfließpressverfahren hergestellt ist.Piston accumulator according to claim 9, characterized in that the piston (5) is made of aluminum and produced by a cold extrusion process. Kolbenspeicher nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, dass das Gehäuse (2) aus Kunststoff gefertigt ist.Piston accumulator according to one of claims 1 to 10, characterized in that the housing (2) is made of plastic. Kolbenspeicher nach Anspruch 11, dadurch gekennzeichnet, dass das Gehäuse (2) aus einem duroplastischen oder aus einem thermoplastischen Kunststoff gefertigt ist.Piston accumulator according to claim 11, characterized in that the housing (2) is made of a duroplastic or of a thermoplastic material.
EP11001989.0A 2010-06-17 2011-03-10 Piston accumulator Active EP2397701B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102010024126A DE102010024126A1 (en) 2010-06-17 2010-06-17 piston accumulators

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EP2397701A2 true EP2397701A2 (en) 2011-12-21
EP2397701A3 EP2397701A3 (en) 2013-08-28
EP2397701B1 EP2397701B1 (en) 2015-10-14

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EP (1) EP2397701B1 (en)
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Also Published As

Publication number Publication date
DE102010024126A1 (en) 2011-12-22
EP2397701B1 (en) 2015-10-14
US20110308383A1 (en) 2011-12-22
CN102287406A (en) 2011-12-21
EP2397701A3 (en) 2013-08-28
CN102287406B (en) 2015-10-28

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