EP2239468B1 - Piston accumulator - Google Patents

Piston accumulator Download PDF

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Publication number
EP2239468B1
EP2239468B1 EP20100003106 EP10003106A EP2239468B1 EP 2239468 B1 EP2239468 B1 EP 2239468B1 EP 20100003106 EP20100003106 EP 20100003106 EP 10003106 A EP10003106 A EP 10003106A EP 2239468 B1 EP2239468 B1 EP 2239468B1
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EP
European Patent Office
Prior art keywords
ring
cylinder tube
end cap
piston accumulator
piston
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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.)
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EP20100003106
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German (de)
French (fr)
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EP2239468A1 (en
Inventor
Brian Kane
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP2239468A1 publication Critical patent/EP2239468A1/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
    • F15B2201/40—Constructional details of accumulators not otherwise provided for
    • F15B2201/405—Housings
    • F15B2201/4053—Housings characterised by the material

Definitions

  • Piston accumulators have to fulfill various tasks in a hydraulic system, for example energy storage, a pressure medium reserve, damping, leakage oil compensation and volume flow compensation.
  • the hydraulic accumulators used for this purpose can be designed as a bubble, piston or diaphragm accumulator.
  • a piston accumulator which consists essentially of a cylinder tube, two front-side closing lids and a piston guided in the cylinder tube. About the latter, a gas space is separated from a pressure medium space.
  • the cylinder tube is made of metal and thereby finely machined, so that the piston runs with minimal friction and between gas and liquid space only a small pressure difference of about 1 bar prevails.
  • the cylinder-side running surfaces can be provided with a suitable coating.
  • the cylinder-side treads are formed by a steel liner, which is inserted into the cylinder, so that the outer region of the cylinder can be wound from a fiber composite. Such solutions are very expensive to manufacture and correspondingly expensive.
  • a piston accumulator with a cylinder tube in which a piston is guided, which separates a gas space from a pressure medium space, wherein the cylinder tube consists of plastic and the end face of each end cap is closed.
  • a metallic support ring Axially between the cylinder tube and an end cap is a metallic support ring which is inserted over a part of its axial length in the cylinder tube. Cylinder tube, support rings and the two end caps are held together as a unit by tie rods extending from end cap to end cap outside the cylinder tube.
  • the invention has for its object to provide a producible with little effort and lightweight piston accumulator.
  • the piston accumulator has a cylinder tube in which a piston is guided, which divides a gas space of a pressure medium space.
  • the cylinder tube is closed at the front by one end cap, is made of plastic and is connected via a metallic support ring, which is located between the cylinder tube and the end cap, with the respective end cap.
  • the inner tread is made of a tribologically optimized material, so that the total weight of the piston accumulator is very low and still allows easy running and reliable sealing of the piston.
  • connection between the plastic cylinder tube and the end caps via the metallic support ring which is optimized in terms of sufficient strength. That is, in the solution according to the invention only the areas subjected to high loads are made of metallic material, wherein the piston accumulator weight substantially determining components, such as the cylinder tube made of lightweight plastic.
  • the support ring has a base which is adapted to the inner diameter of the cylinder tube and a convexly curved outer surface, which in turn is surrounded by the cylinder tube end section in a form-fitting manner, wherein the support ring rests on the outer circumference of the end cap.
  • a recess for partially receiving a ring is to be formed in the base of the support ring.
  • complementary recesses are provided which complement each other to form a positive receptacle for the support ring.
  • the ring is made split.
  • the ring of metallic material, preferably of steel.
  • the clamping ring can be made of plastic.
  • the clamping ring is located at the base of the support ring and on an end face of the end cap and is screwed thereto, so that the aforementioned ring is secured in the axial direction.
  • the support ring is preferably made of steel.
  • the compressive strength of the piston accumulator is particularly high when the cylinder tube consists of a fiber composite material. Such a solution is also characterized by a minimal weight.
  • this cylinder tube can then be performed with a metallic coating as a running layer.
  • the piston accumulator is particularly compact if a pressure medium connection is formed in one end cap and a gas connection is formed in the other end cap.
  • the piston end faces of the end caps can be made concave.
  • FIG. 1 a longitudinal section of a piston accumulator 1 according to the invention is shown.
  • This has a cylinder tube 2, in which a piston 4 is axially displaceable, so that the cylinder interior is divided into a pressure medium chamber 6 and a gas chamber 8.
  • the cylinder tube 2 is frontally closed by one end cap 10, 12, wherein in the latter end cap 12, a pressure medium connection 14 and in the former end cap 10, a gas port 16 is formed.
  • the piston accumulator 1 is connected via the pressure medium connection 14 to a hydraulic system, for example to store hydraulic energy, to dampen pressure or volume fluctuations or to form a fluid reserve.
  • a hydraulic system for example to store hydraulic energy, to dampen pressure or volume fluctuations or to form a fluid reserve.
  • the gas side of the piston accumulator 1 with the compressed gas, such as nitrogen are filled and pressurized.
  • two circumferential grooves 18, 20 are formed on the outer circumference of the piston 4, in each of which a seal arrangement with a support ring 22, 24 and a sealing ring 26, 28 is arranged.
  • These two seal assemblies are sealingly and with comparatively low bias on an inner peripheral wall 30 of the cylinder tube 2, so that the piston 4 is easily adjustable and thus friction losses are minimal, the two chambers 6, 8, however, are reliably sealed against each other.
  • the cylinder tube 2 made of a fiber composite material, for example impregnated with continuous fibers in a thermoplastic or thermoset matrix (epoxy). In this way, an extremely lightweight cylinder tube 2 can be produced, wherein the material selection is optimized in terms of tribology.
  • the isselvesswandung 30 of the cylinder tube 2 may also be formed by a metallic coating - but the outer peripheral portions of the cylinder tube 2 are then also made of plastic.
  • the piston 4 may be made of a metallic material or also of plastic, to further minimize the weight.
  • the piston 4 is designed as a hollow piston with a piston skirt 5 and a piston crown 7.
  • the highly loaded frontal areas with the end caps 10, 12 are made of a metal / composite material. Details of the structure are the detail X removable.
  • the end caps 10, 12 are curved slightly outwardly in the axial direction, so that a concave inner end face 32 results.
  • a recess 36 is formed, in which a further sealing arrangement 38 is formed.
  • the end cap 10 is sealingly against the inner peripheral wall 30 of the cylinder tube 2.
  • a metallic support ring 40 which extends in the axial direction beyond the end cap 10 also.
  • the support ring 40 is made of steel and has, according to FIGS. 2 and 3, a cylindrical inner peripheral surface which forms a base 42.
  • a circumferential recess 44 is provided centrally, which has the shape of a semicircle with the radius r in cross section.
  • the left part of the base 42 is provided with a chamfer 46, which facilitates the insertion of the piston 4 with its seals 26, 28.
  • the base 42 extends flush in extension with the inner peripheral wall 30 of the cylinder tube 2.
  • the support ring 40 is rotated by 180 ° about its vertical axis relative to the illustration in FIG FIG. 1 shown.
  • the support ring 40 bulges away from the cylindrical base 42 radially outward, so that a convex curved, centrally in the radial direction continuously expanded outer surface 48 results.
  • This radially projecting part of the support ring 40 is overlapped according to the detail X of the adjacent end portion 50 of the cylinder tube 2 - in other words, the cylinder tube 2 extends in the axial direction beyond the support ring 40 also.
  • the end portion 50 is opposite the central one Guide area for the piston 4 extended in the radial direction, said outer contour corresponds approximately to the shape of the bulged outer surface 48 of the support ring 40.
  • the end portion 50 lies with a groove 52 flat against the outer surface 48 of the support ring 40, so that it is embedded and the base 42 - as mentioned above - flush with the inner peripheral wall 30 of the cylinder tube 2. Accordingly, the support ring 40 is embedded in the radially expanded end portion 50 of the cylinder tube 2.
  • a cross-sectionally circular groove 56 whose radius corresponds to the radius r of the recess 44.
  • the groove 56 is curved over 90 ° and runs tangentially in the longitudinal direction of the piston accumulator.
  • a clamping ring 58 is attached to the end face 54, with its radial wall 60 at the base 42 (see FIGS. 2 and 3 ) of the support ring 40 and abuts with its end wall 62 on the end face 54 of the end cap 10 and is connected via a plurality of lying on a common pitch circle screws 64 with the end cap 10.
  • a further groove portion 66 is formed with the radius r on the clamping ring 58, which together with the groove 56 of the end cap 10 and the recess 44 of the support ring 40 to a closed receptacle for a ring 68th results.
  • the recess 44 extends approximately to half the circumference of the ring 68, while the groove 56 extends over more than a quarter of the circumference and corresponding to the groove portion 66 extends to less than a quarter of the circumference. That is, the groove 56 and the recess 44 engage around more than% of the ring outer circumference, so that it is received in a form-fitting manner.
  • this is divided, preferably designed in three parts. For assembly, the end cap 10 is first inserted into the cylinder tube 2, and further inserted, as it corresponds to their later final position.
  • the plurality of parts of the ring 68 are inserted into the recess 44 of the support ring 40. Then the Retained end cap 10 in its final position, wherein the groove 56 of the end cap 10, the parts of the ring 68 receives. Then, the clamping ring 58 is inserted into the end portion 50 of the cylinder tube 2 and screwed by screws 64 with the end cap 10, in which case the multi-part ring 68 is completely encompassed and the seal assembly 38 of the end cap 10 sealingly abuts the inner peripheral wall 30 of the cylinder tube 2 , The clamping ring 58 also has a sealing function and prevents dirt from entering the area of the ring 68.
  • the cylinder tube 2 consists of a fiber-reinforced plastic - preferably carbon fiber reinforced plastic -, the support ring 40 is made of steel and the end cap 10 may for example be made of titanium or steel.
  • the clamping ring 58 is made in the illustrated embodiment of a high strength plastic to further minimize the weight. It was found that this metal / composite construction ensures sufficient strength and tightness of the components with minimum weight.
  • the above-described piston accumulator 1 is characterized by an extremely low weight with optimum strength and comparatively easy to manufacture, with a very compact smooth-surfaced construction is ensured by the end caps used 10, 12 and the continuously bulging end portions 50 of the cylinder tube 2.

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

Description

Kolbenspeicher haben in einer Hydroanlage verschiedene Aufgaben, beispielsweise die Energiespeicherung, eine Druckmittelreserve, Dämpfung, Leckölkompensation und Volumenstromkompensation zu erfüllen. Die dazu verwendeten Hydrospeicher können als Blasen-, Kolben- oder Membranspeicher ausgeführt sein. In dem Buch "Der Hydrauliktrainer, Band 1"; 3. Ausgabe, 2004 ; Bosch Rexroth AG ist im Kapitel 3 ein Kolbenspeicher beschrieben, der im Wesentlichen aus einem Zylinderrohr, zwei stirnseitigen Verschlussdeckeln und einem im Zylinderrohr geführten Kolben besteht. Über letzteren wird ein Gasraum von einem Druckmittelraum getrennt. Üblicherweise wird das Zylinderrohr aus Metall gefertigt und dabei feinstbearbeitet, so dass der Kolben mit minimaler Reibung läuft und zwischen Gas- und Flüssigkeitsraum nur eine geringe Druckdifferenz von ca. 1 bar herrscht. Zur Minimierung der Reibung können die zylinderseitigen Laufflächen mit einer geeigneten Beschichtung versehen werden. Es sind auch Leichtbau-Lösungen bekannt, bei denen die zylinderseitigen Laufflächen durch einen Stahlliner ausgebildet sind, der in den Zylinder eingesetzt wird, so dass der Außenbereich des Zylinders aus einem Faserverbund gewickelt werden kann. Derartige Lösungen sind sehr aufwendig in der Fertigung und entsprechend teuer.Piston accumulators have to fulfill various tasks in a hydraulic system, for example energy storage, a pressure medium reserve, damping, leakage oil compensation and volume flow compensation. The hydraulic accumulators used for this purpose can be designed as a bubble, piston or diaphragm accumulator. By doing Book "The Hydraulic Trainer, Volume 1"; 3rd edition, 2004 ; Bosch Rexroth AG describes in Chapter 3 a piston accumulator which consists essentially of a cylinder tube, two front-side closing lids and a piston guided in the cylinder tube. About the latter, a gas space is separated from a pressure medium space. Usually, the cylinder tube is made of metal and thereby finely machined, so that the piston runs with minimal friction and between gas and liquid space only a small pressure difference of about 1 bar prevails. To minimize the friction, the cylinder-side running surfaces can be provided with a suitable coating. There are also lightweight solutions are known in which the cylinder-side treads are formed by a steel liner, which is inserted into the cylinder, so that the outer region of the cylinder can be wound from a fiber composite. Such solutions are very expensive to manufacture and correspondingly expensive.

Nachteilig bei derartigen Kolbenspeichern ist, dass diese ein sehr hohes Gewicht aufweisen.A disadvantage of such piston accumulators that they have a very high weight.

Aus der US 2008/0308168 A1 ist ein Kolbenspeicher mit einem Zylinderrohr bekannt, in dem ein Kolben geführt ist, der einen Gasraum von einem Druckmittelraum trennt, wobei das Zylinderrohr aus Kunststoff besteht und stirnseitig von jeweils einer Endkappe verschlossen ist. Axial zwischen dem Zylinderrohr und einer Endkappe befindet sich ein metallischer Stützring, der über einen Teil seiner axialen Länge in das Zylinderrohr eingesetzt ist. Zylinderrohr, Stützringe und die beiden Endkappen werden durch Zuganker, die sich außerhalb des Zylinderrohrs von Endkappe zu Endkappe erstrecken, als Einheit zusammengehalten.From the US 2008/0308168 A1 a piston accumulator with a cylinder tube is known, in which a piston is guided, which separates a gas space from a pressure medium space, wherein the cylinder tube consists of plastic and the end face of each end cap is closed. Axially between the cylinder tube and an end cap is a metallic support ring which is inserted over a part of its axial length in the cylinder tube. Cylinder tube, support rings and the two end caps are held together as a unit by tie rods extending from end cap to end cap outside the cylinder tube.

Demgegenüber liegt der Erfindung die Aufgabe zugrunde, einen mit geringem Aufwand herstellbaren und leichten Kolbenspeicher zu schaffen.In contrast, the invention has for its object to provide a producible with little effort and lightweight piston accumulator.

Diese Aufgabe wird durch einen Kolbenspeicher mit den Merkmalen des Patentanspruchs 1 gelöst.This object is achieved by a piston accumulator having the features of patent claim 1.

Erfindungsgemäß hat der Kolbenspeicher ein Zylinderrohr, in dem ein Kolben geführt ist, der einen Gasraum von einem Druckmittelraum unterteilt. Das Zylinderrohr ist stirnseitig von jeweils einer Endkappe verschlossen, besteht aus Kunststoff und ist über einen metallischen Stützring, der sich zwischen dem Zylinderrohr und der Endkappe befindet, mit der jeweiligen Endkappe verbunden. Die Innenlauffläche wird aus einem tribologisch optimierten Material hergestellt, so dass das Gesamtgewicht des Kolbenspeichers sehr gering ist und trotzdem ein leichtes Laufen und eine zuverlässige Abdichtung des Kolbens ermöglicht ist.According to the piston accumulator has a cylinder tube in which a piston is guided, which divides a gas space of a pressure medium space. The cylinder tube is closed at the front by one end cap, is made of plastic and is connected via a metallic support ring, which is located between the cylinder tube and the end cap, with the respective end cap. The inner tread is made of a tribologically optimized material, so that the total weight of the piston accumulator is very low and still allows easy running and reliable sealing of the piston.

Die Verbindung zwischen dem aus Kunststoff bestehenden Zylinderrohr und den Endkappen erfolgt über den metallischen Stützring, der im Hinblick auf eine hinreichende Festigkeit optimiert ist. Das heißt, bei der erfindungsgemäßen Lösung sind lediglich die hohen Belastungen unterworfenen Bereiche aus metallischem Werkstoff hergestellt, wobei das Kolbenspeichergewicht wesentlich bestimmende Bauelemente, beispielsweise das Zylinderrohr aus leichtem Kunststoff bestehen.The connection between the plastic cylinder tube and the end caps via the metallic support ring, which is optimized in terms of sufficient strength. That is, in the solution according to the invention only the areas subjected to high loads are made of metallic material, wherein the piston accumulator weight substantially determining components, such as the cylinder tube made of lightweight plastic.

Der Stützring weist eine an den Innendurchmesser des Zylinderrohrs angepasste Basis sowie eine konvex ausgewölbte Außenfläche auf, die dann ihrerseits vom Zylinderrohrendabschnitt formschlüssig umgriffen ist, wobei der Stützring auf dem Außenumfang der Endkappe aufsitzt.The support ring has a base which is adapted to the inner diameter of the cylinder tube and a convexly curved outer surface, which in turn is surrounded by the cylinder tube end section in a form-fitting manner, wherein the support ring rests on the outer circumference of the end cap.

Dabei ist in der Basis des Stützrings eine Ausnehmung zum abschnittsweise Aufnehmen eines Rings auszubilden. An den benachbarten Bereichen der Endkappe und eines Spannrings sind komplementäre Ausnehmungen vorgesehen, die sich gemeinsam zu einer formschlüssigen Aufnahme für den Stützring ergänzen.In this case, a recess for partially receiving a ring is to be formed in the base of the support ring. At the adjacent areas of the end cap and a clamping ring complementary recesses are provided which complement each other to form a positive receptacle for the support ring.

Vorteilhafte Ausgestaltungen eines erfindungsgemäßen Kolbenspeichers finden sich in den UnteransprüchenAdvantageous embodiments of a piston accumulator according to the invention can be found in the subclaims

Um das Einsetzen des Stützrings zu ermöglichen, ist der Ring geteilt ausgeführt.To allow the insertion of the support ring, the ring is made split.

Dabei wird es bevorzugt, den Ring aus metallischem Werkstoff, vorzugsweise aus Stahl herzustellen.It is preferred to produce the ring of metallic material, preferably of steel.

Der Spannring kann aus Kunststoff hergestellt sein. Bei einer Variante liegt der Spannring an der Basis des Stützrings und an einer Stirnfläche der Endkappe an und ist mit dieser verschraubt, so dass der vorgenannte Ring in Axialrichtung gesichert ist.The clamping ring can be made of plastic. In a variant of the clamping ring is located at the base of the support ring and on an end face of the end cap and is screwed thereto, so that the aforementioned ring is secured in the axial direction.

Der Stützring besteht vorzugsweise aus Stahl.The support ring is preferably made of steel.

Die Druckbelastbarkeit des Kolbenspeichers ist besonders hoch, wenn das Zylinderrohr aus einem Faserverbundwerkstoff besteht. Eine derartige Lösung zeichnet sich auch durch ein minimales Gewicht aus.The compressive strength of the piston accumulator is particularly high when the cylinder tube consists of a fiber composite material. Such a solution is also characterized by a minimal weight.

Zur Minimierung der Reibungsverluste kann dieses Zylinderrohr dann mit einer metallischen Beschichtung als Laufschicht ausgeführt werden.To minimize the friction losses of this cylinder tube can then be performed with a metallic coating as a running layer.

Der Kolbenspeicher ist besonders kompakt, wenn in einer Endkappe ein Druckmittelanschluss und in der anderen Endkappe ein Gasanschluss ausgebildet ist.The piston accumulator is particularly compact if a pressure medium connection is formed in one end cap and a gas connection is formed in the other end cap.

Zur Festigkeits- und Volumenoptimierung können die dem Kolben zugewandten Stirnflächen der Endkappen konkav ausgeführt werden.For strength and volume optimization, the piston end faces of the end caps can be made concave.

Im Folgenden wird ein bevorzugtes Ausführungsbeispiel der Erfindung anhand schematischer Zeichnungen näher erläutert. Es zeigen:

  • Figur 1 einen Längsschnitt durch einen erfindungsgemäßen Kolbenspeicher sowie zwei Einzelheiten X, Y dieses Kolbenspeichers,
  • Figur 2 einen Stützring des Kolbenspeichers gemäß Figur 1 und
  • Figur 3 eine Querschnittdarstellung des Stützrings aus Figur 2.
In the following, a preferred embodiment of the invention is explained in more detail with reference to schematic drawings. Show it:
  • FIG. 1 3 a longitudinal section through a piston accumulator according to the invention and two details X, Y of this piston accumulator,
  • FIG. 2 a support ring of the piston accumulator according to FIG. 1 and
  • FIG. 3 a cross-sectional view of the support ring FIG. 2 ,

In Figur 1 ist ein Längsschnitt eines erfindungsgemäßen Kolbenspeichers 1 gezeigt. Dieser hat ein Zylinderrohr 2, in dem axial verschiebbar ein Kolben 4 geführt ist, so dass der Zylinderinnenraum in einen Druckmittelraum 6 und einen Gasraum 8 unterteilt ist. Das Zylinderrohr 2 ist stirnseitig durch jeweils eine Endkappe 10, 12 geschlossen, wobei in der letztgenannten Endkappe 12 ein Druckmittelanschluss 14 und in der erstgenannten Endkappe 10 ein Gasanschluss 16 ausgebildet ist. Der Kolbenspeicher 1 ist über den Druckmittelanschluss 14 an ein Hydrauliksystem angeschlossen, um beispielsweise hydraulische Energie zu speichern, Druck- oder Volumenschwankungen zu dämpfen oder eine Flüssigkeitsreserve zu bilden. Über den Gasanschluss 16 kann die Gasseite des Kolbenspeichers 1 mit dem Druckgas, beispielsweise Stickstoff, gefüllt und mit Druck beaufschlagt werden.In FIG. 1 a longitudinal section of a piston accumulator 1 according to the invention is shown. This has a cylinder tube 2, in which a piston 4 is axially displaceable, so that the cylinder interior is divided into a pressure medium chamber 6 and a gas chamber 8. The cylinder tube 2 is frontally closed by one end cap 10, 12, wherein in the latter end cap 12, a pressure medium connection 14 and in the former end cap 10, a gas port 16 is formed. The piston accumulator 1 is connected via the pressure medium connection 14 to a hydraulic system, for example to store hydraulic energy, to dampen pressure or volume fluctuations or to form a fluid reserve. Via the gas connection 16, the gas side of the piston accumulator 1 with the compressed gas, such as nitrogen, are filled and pressurized.

Wie der Einzelheit Y entnehmbar ist, sind am Außenumfang des Kolbens 4 zwei umlaufende Nuten 18, 20 ausgebildet, in die jeweils eine Dichtungsanordnung mit einem Abstützring 22, 24 und einem Dichtring 26, 28 angeordnet ist. Diese beiden Dichtungsanordnungen liegen dichtend und mit vergleichsweise geringer Vorspannung an einer Innenumfangswandung 30 des Zylinderrohrs 2 an, so dass der Kolben 4 leichtgängig verstellbar ist und somit Reibungsverluste minimal sind, die beiden Räume 6, 8 jedoch zuverlässig gegeneinander abgedichtet sind. Beim dargestellten Ausführungsbeispiel ist das Zylinderrohr 2 aus einem Faserverbundwerkstoff, beispielsweise mit Endlosfasern in einer Thermoplast- oder Duroplastmatrix (Epoxid) getränkt. Auf diese Weise lässt sich ein äußerst leichtes Zylinderrohr 2 herstellen, wobei die Materialauswahl im Hinblick auf die Tribologie optimiert ist. Bei besonderen Anwendungen kann die Innenumfangswandung 30 des Zylinderrohrs 2 auch durch eine metallische Beschichtung ausgebildet werden - die Außenumfangsbereiche des Zylinderrohrs 2 sind dann jedoch ebenfalls aus Kunststoff hergestellt. Der Kolben 4 kann aus einem metallischen Werkstoff oder ebenfalls aus Kunststoff hergestellt sein, um das Gewicht weiter zu minimieren. Der Kolben 4 ist als Hohlkolben mit einem Kolbenhemd 5 und einem Kolbenboden 7 ausgeführt.As the detail Y can be removed, two circumferential grooves 18, 20 are formed on the outer circumference of the piston 4, in each of which a seal arrangement with a support ring 22, 24 and a sealing ring 26, 28 is arranged. These two seal assemblies are sealingly and with comparatively low bias on an inner peripheral wall 30 of the cylinder tube 2, so that the piston 4 is easily adjustable and thus friction losses are minimal, the two chambers 6, 8, however, are reliably sealed against each other. In the illustrated embodiment, the cylinder tube 2 made of a fiber composite material, for example impregnated with continuous fibers in a thermoplastic or thermoset matrix (epoxy). In this way, an extremely lightweight cylinder tube 2 can be produced, wherein the material selection is optimized in terms of tribology. In special applications, the Innenumfangswandung 30 of the cylinder tube 2 may also be formed by a metallic coating - but the outer peripheral portions of the cylinder tube 2 are then also made of plastic. The piston 4 may be made of a metallic material or also of plastic, to further minimize the weight. The piston 4 is designed as a hollow piston with a piston skirt 5 and a piston crown 7.

Die hochbelasteten stirnseitigen Bereiche mit den Endkappen 10, 12 sind aus einem Metall-/Komposit-Material hergestellt. Details des Aufbaus sind der Einzelheit X entnehmbar.The highly loaded frontal areas with the end caps 10, 12 are made of a metal / composite material. Details of the structure are the detail X removable.

Gemäß der Einzelheit X sind die Endkappen 10, 12 in Axialrichtung leicht nach außen gewölbt, so dass sich eine konkave Innenstirnfläche 32 ergibt. An einer zylindrischen Außenumfangswandung 34 der Endkappe 10 ist ein Einstich 36 ausgebildet, in den eine weitere Dichtungsanordnung 38 ausgebildet ist. Entlang dieser Dichtungsanordnung 38 liegt die Endkappe 10 dichtend an der Innenumfangswandung 30 des Zylinderrohrs 2 an. In der Einzelheit X links von der Dichtungsanordnung 38 liegt an der Umfangswandung 34 der Endkappe 10 ein metallischer Stützring 40 an, der sich in Axialrichtung über die Endkappe 10 hinaus erstreckt.According to the detail X, the end caps 10, 12 are curved slightly outwardly in the axial direction, so that a concave inner end face 32 results. On a cylindrical outer circumferential wall 34 of the end cap 10, a recess 36 is formed, in which a further sealing arrangement 38 is formed. Along this seal assembly 38, the end cap 10 is sealingly against the inner peripheral wall 30 of the cylinder tube 2. In the detail X to the left of the seal assembly 38 abuts the circumferential wall 34 of the end cap 10, a metallic support ring 40 which extends in the axial direction beyond the end cap 10 also.

Einzelheiten dieses Stützrings 40 werden anhand der Figuren 2 und 3 erläutert.Details of this support ring 40 are based on the FIGS. 2 and 3 explained.

Erfindungsgemäß ist der Stützring 40 aus Stahl ausgeführt und hat gemäß den Figuren 2 und 3 eine zylindrische Innenumfangsfläche, die eine Basis 42 ausbildet. In dieser Basis ist mittig eine umlaufende Ausnehmung 44 vorgesehen, die im Querschnitt die Form eines Halbkreises mit dem Radius r hat. Im Übergangsbereich zwischen der als Hohlkehle ausgeführten Ausnehmung 44 und dem in Figur 3 linken Teil der Basis 42 (Innenumfangswandung) ist eine Fase 46 vorgesehen, die das Einsetzen des Kolbens 4 mit seinen Dichtungen 26, 28 erleichtert. Gemäß der Einzelheit X verläuft die Basis 42 bündig in Verlängerung mit der Innenumfangswandung 30 des Zylinderrohrs 2. In den Figuren 2 und 3 ist der Stützring 40 um 180° verdreht um seine Hochachse gegenüber der Darstellung in Figur 1 dargestellt.According to the invention, the support ring 40 is made of steel and has, according to FIGS. 2 and 3, a cylindrical inner peripheral surface which forms a base 42. In this base, a circumferential recess 44 is provided centrally, which has the shape of a semicircle with the radius r in cross section. In the transition region between the groove 44 designed as a recess 44 and the in FIG. 3 The left part of the base 42 (inner circumferential wall) is provided with a chamfer 46, which facilitates the insertion of the piston 4 with its seals 26, 28. According to the detail X, the base 42 extends flush in extension with the inner peripheral wall 30 of the cylinder tube 2. In the FIGS. 2 and 3 the support ring 40 is rotated by 180 ° about its vertical axis relative to the illustration in FIG FIG. 1 shown.

Der Stützring 40 wölbt sich weg von der zylinderförmigen Basis 42 radial nach außen aus, so dass sich eine konvex gekrümmte, mittig in Radialrichtung kontinuierlich erweiterte Außenfläche 48 ergibt. Dieser radial vorspringende Teil des Stützrings 40 wird gemäß der Einzelheit X vom benachbarten Endabschnitt 50 des Zylinderrohrs 2 übergriffen - mit anderen Worten gesagt, das Zylinderrohr 2 erstreckt sich in Axialrichtung über den Stützring 40 hinaus. Dabei ist der Endabschnitt 50 gegenüber dem mittigen Führungsbereich für den Kolben 4 in Radialrichtung erweitert, wobei diese Außenkontur in etwa der Form der ausgewölbten Außenfläche 48 des Stützrings 40 entspricht. Dabei liegt der Endabschnitt 50 mit einer Hohlkehle 52 flächig an der Außenfläche 48 des Stützrings 40 an, so dass dieser eingebettet ist und dessen Basis 42 - wie vorstehend erwähnt - bündig zur Innenumfangswandung 30 des Zylinderrohrs 2 verläuft. Demgemäß ist der Stützring 40 in den radial erweiterten Endabschnitt 50 des Zylinderrohrs 2 eingebettet.The support ring 40 bulges away from the cylindrical base 42 radially outward, so that a convex curved, centrally in the radial direction continuously expanded outer surface 48 results. This radially projecting part of the support ring 40 is overlapped according to the detail X of the adjacent end portion 50 of the cylinder tube 2 - in other words, the cylinder tube 2 extends in the axial direction beyond the support ring 40 also. In this case, the end portion 50 is opposite the central one Guide area for the piston 4 extended in the radial direction, said outer contour corresponds approximately to the shape of the bulged outer surface 48 of the support ring 40. In this case, the end portion 50 lies with a groove 52 flat against the outer surface 48 of the support ring 40, so that it is embedded and the base 42 - as mentioned above - flush with the inner peripheral wall 30 of the cylinder tube 2. Accordingly, the support ring 40 is embedded in the radially expanded end portion 50 of the cylinder tube 2.

Wie sich insbesondere aus der Einzelheit X ergibt, ist im Eckbereich zwischen der Umfangswandung 34 und einer Stirnfläche 54 der Endkappe 10 eine im Querschnitt kreisabschnittförmige Hohlkehle 56 vorgesehen, deren Radius dem Radius r der Ausnehmung 44 entspricht. Die Hohlkehle 56 verläuft über 90° gekrümmt und läuft tangential in Längsrichtung des Kolbenspeichers aus.As is apparent in particular from the detail X, in the corner region between the peripheral wall 34 and an end face 54 of the end cap 10 is provided a cross-sectionally circular groove 56 whose radius corresponds to the radius r of the recess 44. The groove 56 is curved over 90 ° and runs tangentially in the longitudinal direction of the piston accumulator.

Im Übergangsbereich zwischen dem Stützring 40 und der Endkappe 10 ist an die Stirnfläche 54 ein Spannring 58 angesetzt, der mit seiner Radialwandung 60 an der Basis 42 (siehe Figuren 2 und 3) des Stützrings 40 und mit seiner Stirnwandung 62 an der Stirnfläche 54 der Endkappe 10 anliegt und über eine Vielzahl von auf einem gemeinsamen Teilkreis liegenden Schrauben 64 mit der Endkappe 10 verbunden ist. Im Eckbereich zwischen der Stirnwandung 62 und der Radialwandung 60 ist an dem Spannring 58 ein weiterer Hohlkehlenabschnitt 66 mit dem Radius r ausgebildet, der sich gemeinsam mit der Hohlkehle 56 der Endkappe 10 und der Ausnehmung 44 des Stützrings 40 zu einer geschlossenen Aufnahme für einen Ring 68 ergibt. Gemäß der Einzelheit X und der Figur 3 erstreckt sich dabei die Ausnehmung 44 etwa um den halben Umfang des Rings 68, während die Hohlkehle 56 mehr als ein Viertel des Umfangs überstreckt und sich entsprechend der Hohlkehlenabschnitt 66 um weniger als ein Viertel des Umfangs erstreckt. Das heißt, die Hohlkehle 56 und die Ausnehmung 44 umgreifen mehr als % des Ringaußenumfangs, so dass dieser formschlüssig aufgenommen ist. Um den Ring 68 einfacher in die Ausnehmung 44 und die Hohlkehle 56 einsetzen zu können, ist dieser geteilt, vorzugsweise dreiteilig ausgeführt. Zur Montage wird zunächst die Endkappe 10 in das Zylinderrohr 2 eingeschoben, und zwar weiter eingeschoben, als es ihrer späteren endgültigen Position entspricht. Anschließend werden die mehreren Teile des Rings 68 in die Ausnehmung 44 des Stützrings 40 eingelegt. Dann wird die Endkappe 10 in ihre endgültige Position zurückgezogen, wobei die Hohlkehle 56 der Endkappe 10 die Teile des Rings 68 aufnimmt. Daraufhin wird dann der Spannring 58 in den Endabschnitt 50 des Zylinderrohrs 2 eingesetzt und über die Schrauben 64 mit der Endkappe 10 verschraubt, wobei dann der mehrteilige Ring 68 vollständig umgriffen ist und die Dichtungsanordnung 38 der Endkappe 10 dichtend an der Innenumfangswandung 30 des Zylinderrohrs 2 anliegt. Der Spannring 58 hat auch Dichtfunktion und verhindert, dass Schmutz in den Bereich des Rings 68 eindringt.In the transition region between the support ring 40 and the end cap 10, a clamping ring 58 is attached to the end face 54, with its radial wall 60 at the base 42 (see FIGS. 2 and 3 ) of the support ring 40 and abuts with its end wall 62 on the end face 54 of the end cap 10 and is connected via a plurality of lying on a common pitch circle screws 64 with the end cap 10. In the corner region between the end wall 62 and the radial wall 60, a further groove portion 66 is formed with the radius r on the clamping ring 58, which together with the groove 56 of the end cap 10 and the recess 44 of the support ring 40 to a closed receptacle for a ring 68th results. According to the detail X and the FIG. 3 In this case, the recess 44 extends approximately to half the circumference of the ring 68, while the groove 56 extends over more than a quarter of the circumference and corresponding to the groove portion 66 extends to less than a quarter of the circumference. That is, the groove 56 and the recess 44 engage around more than% of the ring outer circumference, so that it is received in a form-fitting manner. In order to use the ring 68 easier in the recess 44 and the groove 56, this is divided, preferably designed in three parts. For assembly, the end cap 10 is first inserted into the cylinder tube 2, and further inserted, as it corresponds to their later final position. Subsequently, the plurality of parts of the ring 68 are inserted into the recess 44 of the support ring 40. Then the Retained end cap 10 in its final position, wherein the groove 56 of the end cap 10, the parts of the ring 68 receives. Then, the clamping ring 58 is inserted into the end portion 50 of the cylinder tube 2 and screwed by screws 64 with the end cap 10, in which case the multi-part ring 68 is completely encompassed and the seal assembly 38 of the end cap 10 sealingly abuts the inner peripheral wall 30 of the cylinder tube 2 , The clamping ring 58 also has a sealing function and prevents dirt from entering the area of the ring 68.

Wie bereits ausgeführt, besteht das Zylinderrohr 2 aus einem faserverstärkten Kunststoff - vorzugsweise kohlefaserverstärkten Kunststoff -, der Stützring 40 besteht aus Stahl und die Endkappe 10 kann beispielsweise aus Titan oder ebenfalls aus Stahl hergestellt sein. Der Spannring 58 ist beim dargestellten Ausführungsbeispiel aus einem hochfesten Kunststoff hergestellt, um das Gewicht weiter zu minimieren. Es zeigte sich, dass durch diese Metall-/Compositkonstruktion eine hinreichende Festigkeit und Dichtigkeit der Bauelemente bei minimalem Gewicht gewährleistet ist.As already stated, the cylinder tube 2 consists of a fiber-reinforced plastic - preferably carbon fiber reinforced plastic -, the support ring 40 is made of steel and the end cap 10 may for example be made of titanium or steel. The clamping ring 58 is made in the illustrated embodiment of a high strength plastic to further minimize the weight. It was found that this metal / composite construction ensures sufficient strength and tightness of the components with minimum weight.

Die Befestigung der in Figur 1 rechten gasseitigen Endkappe 10 am Zylinderrohr 2 erfolgt entsprechend, so dass weitere diesbezügliche Einzelheiten entbehrlich sind.The attachment of in FIG. 1 right gas-side end cap 10 on the cylinder tube 2 is carried out accordingly, so that further details in this regard are unnecessary.

Der vorbeschriebene Kolbenspeicher 1 zeichnet sich durch ein äußerst geringes Gewicht bei optimaler Festigkeit und vergleichsweise einfacher Herstellbarkeit aus, wobei durch die eingesetzten Endkappen 10, 12 und die sich kontinuierlich auswölbenden Endabschnitte 50 des Zylinderrohrs 2 ein besonders kompakter glattflächiger Aufbau gewährleistet ist.The above-described piston accumulator 1 is characterized by an extremely low weight with optimum strength and comparatively easy to manufacture, with a very compact smooth-surfaced construction is ensured by the end caps used 10, 12 and the continuously bulging end portions 50 of the cylinder tube 2.

Claims (9)

  1. Piston accumulator with a cylinder tube (2), in which is guided a piston (4) which separates a gas space (8) from a pressure-medium space (6), the cylinder tube (2) being closed on each of the end faces by an end cap (10, 12), being composed of plastic and being connected to the respective end cap (10, 12) via a metallic connection element which is a supporting ring (40) located between the cylinder tube (2) and the end cap (10, 12), end portions (50) of the cylinder tube (2) extending beyond the supporting ring (40), characterized in that the supporting ring (40) has a base (42) adapted to the inside diameter of the cylinder tube (2) and a convexly curved outer face (48) which is surrounded with a form fit by the cylindertube end portion (50), and in that a recess (44) for the partial reception of a ring (68) is formed in the base (42) of the supporting ring (40), complementary recesses (56, 66), which jointly supplement one another to make a form-fit receptacle for the ring (68), being formed on the end cap (10) and on a tension ring (58).
  2. Piston accumulator according to Patent Claim 1, the ring (68) being split.
  3. Piston accumulator according to Patent Claim 1 or 2, the ring (68) being composed of metallic material, preferably of steel, and/or the tension ring (58) being produced from plastic.
  4. Piston accumulator according to one of Claims 1 to 3, the tension ring (58) bearing against the base (42) of the supporting ring (40) and against an end face (54) of the end cap (10, 12) and being screwed to the latter.
  5. Piston accumulator according to one of the preceding patent claims, the supporting ring (40) being composed of steel.
  6. Piston accumulator according to one of the preceding patent claims, the cylinder tube (2) being composed of a composite fibre material.
  7. Piston accumulator according to one of the preceding patent claims, the cylinder tube (2) being coated metallically.
  8. Piston accumulator according to one of the preceding patent claims, a pressure-medium connection (14) being provided in one end cap (12) and a gas connection (16) being provided in the other end cap (10).
  9. Piston accumulator according to one of the preceding patent claims, those bottom faces (32) of the end caps (10, 12) which point towards the piston (4) being curved concavely.
EP20100003106 2009-04-06 2010-03-24 Piston accumulator Not-in-force EP2239468B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200910016570 DE102009016570A1 (en) 2009-04-06 2009-04-06 piston accumulators

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EP2239468A1 EP2239468A1 (en) 2010-10-13
EP2239468B1 true EP2239468B1 (en) 2012-08-22

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2470796B1 (en) * 2009-08-26 2017-03-22 Parker Hannifin Manufacturing France - Etablissement de Colombes Composite piston accumulator
DE102012025225A1 (en) * 2012-12-21 2014-06-26 Robert Bosch Gmbh Protective cap for tubular element, has detent element that configured for locking cap which is arranged in tubular element with lid
DE102013220093A1 (en) * 2013-10-02 2015-04-02 Robert Bosch Gmbh piston accumulators
DE102013220094A1 (en) * 2013-10-02 2015-04-02 Robert Bosch Gmbh piston accumulators
DE102017000362A1 (en) * 2017-01-17 2018-07-19 Liebherr-Components Kirchdorf GmbH Cylinder-piston device with a made of a fiber composite cylinder
CN110594573A (en) * 2019-09-10 2019-12-20 中国空气动力研究与发展中心超高速空气动力研究所 Low-pressure gas storage device
DE102019007711A1 (en) * 2019-11-07 2021-05-12 Hydac Technology Gmbh Piston accumulator

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1185613B (en) * 1985-05-30 1987-11-12 Magnaghi Cleodinamica Spa GAS-OIL PRESSURE ACCUMULATOR WITH COMPOSITE MATERIAL STRUCTURE FOR AIRCRAFT HYDRAULIC CIRCUITS
DE10310427A1 (en) * 2003-03-11 2004-09-30 Hydac Technology Gmbh hydraulic accumulator
US8020587B2 (en) * 2007-06-11 2011-09-20 The United States Of America As Represented By The Administrator Of The U.S. Environmental Protection Agency Piston-in sleeve hydraulic pressure accumulator
US7661442B2 (en) 2007-06-14 2010-02-16 Limo-Reid, Inc. Compact hydraulic accumulator

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DE102009016570A1 (en) 2010-10-07

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