EP2397701B1 - Piston accumulator - Google Patents

Piston accumulator Download PDF

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Publication number
EP2397701B1
EP2397701B1 EP11001989.0A EP11001989A EP2397701B1 EP 2397701 B1 EP2397701 B1 EP 2397701B1 EP 11001989 A EP11001989 A EP 11001989A EP 2397701 B1 EP2397701 B1 EP 2397701B1
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EP
European Patent Office
Prior art keywords
piston
manufactured
plastic
housing
accumulator according
Prior art date
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EP11001989.0A
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German (de)
French (fr)
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EP2397701A3 (en
EP2397701A2 (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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Publication of EP2397701A2 publication Critical patent/EP2397701A2/en
Publication of EP2397701A3 publication Critical patent/EP2397701A3/en
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    • 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 according to the preamble of patent claim 1.
  • a piston accumulator is known with a housing whose inner diameter is coated with a resin.
  • the GB 2 263 753 A discloses a piston accumulator whose piston is loaded with a spring.
  • 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 sliding layer allows to move a piston without guide rings within a housing. It has been concretely recognized that the play between the lateral surface of the piston and the housing wall can be adjusted by the action of a sliding layer so that no guide rings are more necessary.
  • the piston accumulator according to the invention therefore has no guide rings associated with the piston. Therefore, the mounting of guide rings is eliminated. Since the piston accumulator according to the invention has no guide rings, its assembly is considerably simplified. The piston accumulator according to the invention can thus be manufactured inexpensively and easily.
  • the piston On the piston, a sliding layer is formed. As a result, the piston can be easily equipped with a sliding layer and used in a housing predetermined meetingses.
  • 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 is verbauform without further processing.
  • 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 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 sliding layer can be applied to the piston and / or on the housing wall.
  • the initial contour of the piston can be through a Kaltft tellrind are produced, wherein the final contour is created by a machining process.
  • 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 seal could be arranged without support ring.
  • a seal surrounding the piston made of an elastomer is used as the seal.
  • 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 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 can be screwed as a whole in an existing arrangement.
  • the piston accumulator 1 can be used as a pulsation damper 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)

Description

Technisches GebietTechnical area

Die Erfindung betrifft einen Kolbenspeicher gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a piston accumulator according to the preamble of patent claim 1.

Stand der TechnikState of the art

Aus der EP 2 060 797 A2 ist ein Kolbenspeicher mit einem Gehäuse bekannt, dessen Innendurchmesser mit einem Harz beschichtet ist.From the EP 2 060 797 A2 For example, a piston accumulator is known with a housing whose inner diameter is coated with a resin.

Aus der DE 20 2007 013 155 U1 ist ein Hydraulikzylinder mit einer Emaillebeschichtung bekannt.From the DE 20 2007 013 155 U1 For example, a hydraulic cylinder with an enamel coating is known.

Die GB 2 263 753 A offenbart einen Kolbenspeicher, dessen Kolben mit einer Feder belastet ist.The GB 2 263 753 A discloses a piston accumulator whose piston is loaded with a spring.

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.

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 the play between the lateral surface of the piston and the housing wall can be adjusted by the action of a sliding layer so that no guide rings are more necessary. The piston accumulator according to the invention therefore has no guide rings associated with the piston. Therefore, the mounting of guide rings is eliminated. Since the piston accumulator according to the invention has no guide rings, its assembly is considerably simplified. The piston accumulator according to the invention can thus be manufactured inexpensively and easily.

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

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 is verbaufähig without further processing. 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.

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 Kaltftießprozess 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 sliding layer can be applied to the piston and / or on the housing wall. The initial contour of the piston can be through a Kaltftießprozess are produced, wherein the final contour is created by a machining process.

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

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.

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.

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 Materialeigenschaften 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.

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. For this purpose, on the one hand to the subordinate claims, on the other hand, to refer to 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 Pulsationsdämpfer 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 can be screwed as a whole in an existing arrangement. For example, the piston accumulator 1 can be used as a pulsation damper 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 (9)

  1. Piston accumulator (1), comprising a housing (2) with a pressure chamber (3) which is delimited 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) being variable, it being possible for the piston (5) to be displaced in a sliding manner along the housing wall (4), the piston (5) and/or the housing wall (4) being assigned a sliding layer (6) in such a way that the piston (5) can be moved free of guide rings (7) along the housing wall (4) and a compressible gas being accommodated in the pressure chamber (3), which gas can be compressed by a hydraulic fluid acting on the piston surface (12), characterized in that a sliding layer (6) is formed on the piston (5), the piston (5) being manufactured from plastic or the piston (5) being manufactured from aluminium and being produced by a shaping process.
  2. Piston accumulator according to Claim 1, characterized in that a sliding layer (6) is formed on the housing wall (4).
  3. Piston accumulator according to Claim 1 or 2, characterized in that a seal (9) is arranged without supporting ring (8) on the piston (5).
  4. Piston accumulator according to any of the preceding claims, in so far as the piston is manufactured from plastic, characterized in that the sliding layer (6) is configured in one piece and integrally with the piston (5), namely is configured as circumferential face (11) of the piston (5).
  5. Piston accumulator according to any of the preceding claims, in so far as the piston is manufactured from plastic, characterized in that the piston (5) is manufactured from a thermosetting plastic.
  6. Piston accumulator according to one of Claims 1 to 4, in so far as the piston is manufactured from plastic, characterized in that the piston (5) is manufactured from a thermosoftening plastic.
  7. Piston accumulator according to one of Claims 1 to 3, in so far as the piston is manufactured from aluminium, characterized in that the piston (5) is manufactured from aluminium and is produced by a cold extruding process.
  8. Piston accumulator according to one of Claims 1 to 7, characterized in that the housing (2) is manufactured from plastic.
  9. Piston accumulator according to Claim 8, characterized in that the housing (2) is manufactured from a thermosetting or from a thermosoftening plastic.
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 EP2397701A2 (en) 2011-12-21
EP2397701A3 EP2397701A3 (en) 2013-08-28
EP2397701B1 true EP2397701B1 (en) 2015-10-14

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EP11001989.0A Active EP2397701B1 (en) 2010-06-17 2011-03-10 Piston accumulator

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US (1) US20110308383A1 (en)
EP (1) EP2397701B1 (en)
CN (1) CN102287406B (en)
DE (1) DE102010024126A1 (en)

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DE102015214202A1 (en) 2015-07-28 2017-02-02 Volkswagen Aktiengesellschaft Piston accumulator for a hydraulic control system of a transmission of a motor vehicle
CN107120321A (en) * 2017-03-02 2017-09-01 成都捷冠科技有限公司 A kind of power saving energy accumulator
JP6702905B2 (en) * 2017-03-13 2020-06-03 日本発條株式会社 accumulator
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Also Published As

Publication number Publication date
CN102287406A (en) 2011-12-21
DE102010024126A1 (en) 2011-12-22
CN102287406B (en) 2015-10-28
EP2397701A3 (en) 2013-08-28
EP2397701A2 (en) 2011-12-21
US20110308383A1 (en) 2011-12-22

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