EP3109486A1 - Cylindrical tube for a hydraulic or pneumatic cylinder - Google Patents

Cylindrical tube for a hydraulic or pneumatic cylinder Download PDF

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Publication number
EP3109486A1
EP3109486A1 EP16175751.3A EP16175751A EP3109486A1 EP 3109486 A1 EP3109486 A1 EP 3109486A1 EP 16175751 A EP16175751 A EP 16175751A EP 3109486 A1 EP3109486 A1 EP 3109486A1
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EP
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Prior art keywords
intermediate layer
metallic liner
cylinder tube
outer tube
liner
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EP16175751.3A
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German (de)
French (fr)
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EP3109486B1 (en
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Prof. Dr. Werner Hufenbach
Dr. Andreas ULBRICHT
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Innotec Lightweight Engineering and Polymer Technology GmbH
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Innotec Lightweight Engineering and Polymer Technology GmbH
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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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1428—Cylinders
    • 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
    • F15B2215/00—Fluid-actuated devices for displacing a member from one position to another
    • F15B2215/30—Constructional details thereof
    • F15B2215/305—Constructional details thereof characterised by the use of special materials

Definitions

  • the invention relates to a cylinder tube for a hydraulic or pneumatic cylinder.
  • FRP fiber-reinforced plastics
  • the DE 103 13 477 B3 has the task of proposing a cylinder tube for a cylinder, which has good stiffness and low weight with good sliding properties.
  • This object is achieved by an inner tube of thermoplastic material and a coaxially arranged outer tube made of fiber-reinforced thermoplastic material, which are connected by an intermediate layer.
  • the intermediate layer is electrically conductive and thus heatable, so that a fusion of inner and outer tube can be achieved.
  • the disadvantage is that the tribological properties of the inner tube of thermoplastic material are not sufficiently stable for many applications. In addition, the technological complexity and thus the production costs are very high.
  • the object of the present invention is to propose a cylinder tube for a hydraulic or pneumatic cylinder, which has a low weight and very good tribological properties and is simple and inexpensive to manufacture.
  • the cylinder tube according to the invention for a hydraulic or pneumatic cylinder has a load-bearing outer tube made of fiber-reinforced plastic and an inner metal liner with a comparatively smaller wall thickness.
  • the outer tube and the liner are included connected by a shear-soft intermediate layer.
  • the metallic liner gives the cylinder tube on the inside very good tribological properties in conjunction with a very good service life.
  • the liner has a low weight due to the very small wall thickness.
  • the liner is preferably not intrinsically stable in order to save weight.
  • the shear-soft intermediate layer can compensate for temperature fluctuations, the different thermal expansion coefficients of metallic liner and the outer tube made of FRP.
  • steel has a coefficient of thermal expansion of 11.3 ⁇ 10 -6 ⁇ K -1
  • carbon fiber reinforced plastic (CFRP) has a coefficient of 2.65 ⁇ 10 -6 ⁇ K -1 in a quasi-isotropic laminate construction by means of unidirectional carbon fiber-reinforced individual layers
  • a unidirectionally reinforced CFRP monolayer has a coefficient in the fiber direction of -0.5 ⁇ 10 -6 ⁇ K -1 and perpendicular to the fiber direction of 43.0 ⁇ 10 -6 ⁇ K -1 . Visible is the large difference between the coefficients of thermal expansion, which leads to a significant difference in length of liner and outer tube with temperature fluctuations. This would lead to the release of the connection between FKV outer tube and metallic liner without the shear-soft intermediate layer.
  • shear-soft intermediate layer Another advantage of the shear-soft intermediate layer is its significantly higher attenuation. Thus, vibrations during operation can be significantly reduced by the structurally inherent high damping.
  • the intermediate layer consists of elastomers, such as ethylene-propylene-diene monomer (EPDM).
  • EPDM ethylene-propylene-diene monomer
  • Elastomers have extremely high elongations at break of up to several 100% and can thus excellently bridge the different thermal expansions between the FRP outer tube and the inner metallic liner.
  • many elastomers have sufficient thermal resistance to application.
  • EPDM elastomers usually have a continuous service temperature range of -40 ° C to + 90 ° C.
  • EPDM has a very good aging resistance under UV or ozone load.
  • the intermediate layer of thermoplastic elastomers which combine the processing advantages of thermoplastics with the material properties of the elastomers.
  • TPE thermoplastic elastomers
  • TPE can be melted, thereby enabling easy production of the intermediate layer.
  • TPE thermoplastic elastomers based on urethane (TPU) or olefin (TPO).
  • TPU thermoplastic elastomers
  • TPO olefin
  • TPC thermoplastic copolyesters
  • TPS styrene block polymers
  • the outer tube preferably consists of several layers of fiber-reinforced plastic.
  • the structural mechanical properties of the outer tube can be adapted very well to the expected loads.
  • the metallic liner is made of steel.
  • steel is available at low cost and has very good tribological properties.
  • the metallic inner liner has a wall thickness between 0.1 mm and 1 mm.
  • the intermediate layer has a preferred wall thickness between 0.1 mm and 0.4 mm.
  • the inventive production of the cylinder tube which consists of the FKV outer tube, the metallic liner and the shear soft intermediate layer can be carried out as follows.
  • the thin-walled metallic liner is manufactured using classical metallic tube manufacturing techniques such as the spin forming process.
  • the application of the shear soft intermediate layer of elastomer or TPE takes place on the outside of the thin-walled metallic liner, usually first a commercial low-viscosity primer (primer) is applied to the outside of the metallic liner.
  • primer a commercial low-viscosity primer
  • This adhesion promoter serves to achieve a good adhesive strength between the metallic liner and the shear-soft intermediate layer of elastomer or TPE.
  • the thin-walled liner can be stabilized from the inside during the application of the primer and the shear-soft intermediate layer by a support core.
  • This support core is preferably a metal or plastic cylinder, the z.
  • As a support core but also the winding or braided core can be used, which is later used for the production of FKV outer tube.
  • the metallic liner can be overmoulded with TPE.
  • TPE films which are wound around the metallic liner and melted and consolidated by brief temperature increase and subsequent cooling.
  • the subsequent production the FKV outer tube in the winding or braiding process is used.
  • the metallic liner with intermediate layer is quasi "wrapped" or interwoven.
  • the winding process is usually done with preimpregnated fibers so that no subsequent resin infiltration is required.
  • the braiding process is generally done with dry fibers, so that subsequent infiltration in a closed tooling system is required.
  • FIG. 1 shows the structure of a cylinder tube according to the invention 1. This has an outer tube consisting of several fiber layers 11, with different fiber orientations. The total wall thickness of the outer tube formed by the fiber layers 11 is 7 mm.
  • the cylinder tube 1 On the inside, the cylinder tube 1 has a metallic liner 13 made of stainless steel with a wall thickness of 0.4 mm. Between the fiber layers 11 and the metallic liner 13, an intermediate layer 12 of thermoplastic polyurethane (TPU) with a layer thickness of 0.2 mm is arranged. The inner diameter of the cylinder tube 1 D i is 85 mm.
  • TPU thermoplastic polyurethane
  • FIG. 2 shows a sectional view in the sectional plane AA through the cylinder tube 1, comprising an inner diameter D i and an outer diameter D a at different temperatures.
  • the fiber layers 11, the intermediate layer 12 and the metallic liner 13 are the same length.
  • the increase in temperature results on the right side in an extension of the metallic liner 13 by the difference in length 2.
  • the shear-soft intermediate layer 12, the elongation difference can be compensated with the length 2, and fiber layers 11 and metallic liner 13 remain connected despite different lengths.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Moulding By Coating Moulds (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Laminated Bodies (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

Das erfindungsgemäße Zylinderrohr für einen Hydraulik- oder Pneumatikzylinder hat ein lasttragendes Außenrohr aus faserverstärktem Kunststoff (11) und einen inneren metallischen Liner (13) mit vergleichsweise geringerer Wandstärke. Das Außenrohr (11) und der Liner (13) sind dabei durch eine schubweiche Zwischenschicht (12) verbunden. Der metallische Liner (13) gibt dem Zylinderrohr auf der Innenseite sehr gute tribologische Eigenschaften in Verbindung mit einer sehr guten Standzeit. Zudem hat der Liner (13) durch die sehr geringe Wandstärke ein geringes Gewicht. Der Liner (13) ist dabei bevorzugt nicht eigenstabil, um Gewicht zu sparen. Vorteilhaft kann die schubweiche Zwischenschicht (12) bei Temperaturschwankungen die unterschiedlichen Wärmeausdehnungskoeffizienten von metallischem Liner (13) und dem Außenrohr (11) aus FKV ausgleichen. Ein weiterer Vorteil der schubweichen Zwischenschicht besteht in deren deutlich höherer Dämpfung. Somit können Schwingungen im Betrieb durch die strukturinhärente hohe Dämpfung deutlich reduziert werden.The cylinder tube according to the invention for a hydraulic or pneumatic cylinder has a load-bearing outer tube made of fiber-reinforced plastic (11) and an inner metallic liner (13) with a comparatively smaller wall thickness. The outer tube (11) and the liner (13) are connected by a shear-soft intermediate layer (12). The metallic liner (13) gives the cylinder tube on the inside very good tribological properties in conjunction with a very good service life. In addition, the liner (13) by the very small wall thickness of a low weight. The liner (13) is preferably not intrinsically stable in order to save weight. Advantageously, the shear-soft intermediate layer (12) compensate for temperature variations, the different thermal expansion coefficients of metallic liner (13) and the outer tube (11) made of FRP. Another advantage of the shear-soft intermediate layer is its significantly higher attenuation. Thus, vibrations during operation can be significantly reduced by the structurally inherent high damping.

Description

Die Erfindung bezieht sich auf ein Zylinderrohr für einen Hydraulik oder Pneumatikzylinder.The invention relates to a cylinder tube for a hydraulic or pneumatic cylinder.

Bei Hydraulik- und Pneumatikzylindern gibt es schon lange Bestrebungen, faserverstärkte Kunststoffe (FKV) einzusetzen, um das Bauteilgewicht zu reduzieren. Nachteil der faserverstärkten Kunststoffe ist, dass sie als Material für die Laufflächen der Zylinder nicht geeignet sind. Zur Lösung dieses Problems gibt es im Stand der Technik verschiedene Ansätze.For hydraulic and pneumatic cylinders, efforts have long been made to use fiber-reinforced plastics (FRP) to reduce component weight. Disadvantage of the fiber-reinforced plastics is that they are not suitable as material for the running surfaces of the cylinder. To solve this problem, there are various approaches in the art.

Beispielsweise wird in der DE 196 49 133 C1 ein Zylinderrohr für einen Arbeitszylinder vorgeschlagen, der ein metallisches Innenrohr und eine kohlenstofffaserverstärkte Außenstruktur aufweist. Innenrohr und Außenstruktur sind durch wellenförmige Bereiche der Mantelfläche des Innenrohres verbunden. Nachteilig hält sich die Gewichtsersparnis aufgrund des massiven metallischen Innenrohres in Grenzen, so dass in Frage steht, ob der fertigungstechnische Aufwand zur Verbindung von Innenrohr und Außenstruktur gerechtfertigt ist.For example, in the DE 196 49 133 C1 proposed a cylinder tube for a working cylinder having a metallic inner tube and a carbon fiber reinforced outer structure. Inner tube and outer structure are connected by wave-shaped areas of the lateral surface of the inner tube. The disadvantage is the weight savings due to the massive metallic inner tube within limits, so that is in question whether the manufacturing cost of the connection of inner tube and outer structure is justified.

Die DE 103 13 477 B3 hat die Aufgabenstellung, ein Zylinderrohr für einen Arbeitszylinder vorzuschlagen, das bei hoher Steifigkeit und geringem Gewicht über gute Gleiteigenschaften verfügt. Diese Aufgabe wird gelöst durch ein Innenrohr aus thermoplastischem Kunststoff und ein koaxial dazu angeordnetes Außenrohr aus faserverstärktem thermoplastischem Kunststoff, die durch eine Zwischenschicht verbunden sind. Die Zwischenschicht ist elektrisch leitfähig und dadurch erwärmbar, so dass eine Verschmelzung von Innen- und Außenrohr erreicht werden kann. Nachteilig sind die tribologischen Eigenschaften des Innenrohres aus thermoplastischem Kunststoff für viele Anwendungen nicht ausreichend standfest. Zudem sind der technologische Aufwand und damit die Fertigungskosten sehr hoch.The DE 103 13 477 B3 has the task of proposing a cylinder tube for a cylinder, which has good stiffness and low weight with good sliding properties. This object is achieved by an inner tube of thermoplastic material and a coaxially arranged outer tube made of fiber-reinforced thermoplastic material, which are connected by an intermediate layer. The intermediate layer is electrically conductive and thus heatable, so that a fusion of inner and outer tube can be achieved. The disadvantage is that the tribological properties of the inner tube of thermoplastic material are not sufficiently stable for many applications. In addition, the technological complexity and thus the production costs are very high.

Die Aufgabenstellung der vorliegenden Erfindung besteht darin, ein Zylinderrohr für einen Hydraulik- oder Pneumatikzylinder vorzuschlagen, das ein geringes Gewicht und sehr gute tribologische Eigenschaften aufweist sowie einfach und kostengünstig herzustellen ist.The object of the present invention is to propose a cylinder tube for a hydraulic or pneumatic cylinder, which has a low weight and very good tribological properties and is simple and inexpensive to manufacture.

Erfindungsgemäß wird diese Aufgabenstellung gelöst durch ein Zylinderrohr nach Anspruch 1 und ein Verfahren zu dessen Herstellung nach Anspruch 9. Bevorzugte Ausgestaltungen der Erfindung sind Gegenstand von Unteransprüchen.According to the invention, this object is achieved by a cylinder tube according to claim 1 and a method for its production according to claim 9. Preferred embodiments of the invention are the subject of dependent claims.

Das erfindungsgemäße Zylinderrohr für einen Hydraulik- oder Pneumatikzylinder hat ein lasttragendes Außenrohr aus faserverstärktem Kunststoff und einen inneren metalischen Liner mit vergleichsweise geringerer Wandstärke. Das Außenrohr und der Liner sind dabei durch eine schubweiche Zwischenschicht verbunden. Der metallische Liner gibt dem Zylinderrohr auf der Innenseite sehr gute tribologische Eigenschaften in Verbindung mit einer sehr guten Standzeit. Zudem hat der Liner durch die sehr geringe Wandstärke ein geringes Gewicht. Der Liner ist dabei bevorzugt nicht eigenstabil, um Gewicht zu sparen. Vorteilhaft kann die schubweiche Zwischenschicht bei Temperaturschwankungen die unterschiedlichen Wärmeausdehnungskoeffizienten von metallischem Liner und dem Außenrohr aus FKV ausgleichen. So hat beispielsweise Stahl einen Wärmausdehnungskoeffizienten von 11,3 x 10-6 x K-1, während kohlenstofffaserverstärkter Kunststoff (CFK) bei einem quasi-isotropen Laminataufbau durch unidirektional kohlenstofffaserverstärkte Einzelschichten einen Koeffizienten von 2,65 x 10-6 x K-1 aufweist. Eine unidirektional verstärkte CFK-Einzelschicht hat in Faserrichtung einen Koeffizienten von -0,5 x 10-6 x K-1 und senkrecht zur Faserrichtung von 43,0 x 10-6 x K-1. Erkennbar ist der große Unterschied zwischen den Wärmeausdehnungskoeffizienten, der bei Temperaturschwankungen zu einer erheblichen Längendifferenz von Liner und Außenrohr führt. Dieser würde ohne die schubweiche Zwischenschicht zum Lösen der Verbindung zwischen FKV-Außenrohr und metallischem Liner führen.The cylinder tube according to the invention for a hydraulic or pneumatic cylinder has a load-bearing outer tube made of fiber-reinforced plastic and an inner metal liner with a comparatively smaller wall thickness. The outer tube and the liner are included connected by a shear-soft intermediate layer. The metallic liner gives the cylinder tube on the inside very good tribological properties in conjunction with a very good service life. In addition, the liner has a low weight due to the very small wall thickness. The liner is preferably not intrinsically stable in order to save weight. Advantageously, the shear-soft intermediate layer can compensate for temperature fluctuations, the different thermal expansion coefficients of metallic liner and the outer tube made of FRP. For example, steel has a coefficient of thermal expansion of 11.3 × 10 -6 × K -1 , while carbon fiber reinforced plastic (CFRP) has a coefficient of 2.65 × 10 -6 × K -1 in a quasi-isotropic laminate construction by means of unidirectional carbon fiber-reinforced individual layers , A unidirectionally reinforced CFRP monolayer has a coefficient in the fiber direction of -0.5 × 10 -6 × K -1 and perpendicular to the fiber direction of 43.0 × 10 -6 × K -1 . Visible is the large difference between the coefficients of thermal expansion, which leads to a significant difference in length of liner and outer tube with temperature fluctuations. This would lead to the release of the connection between FKV outer tube and metallic liner without the shear-soft intermediate layer.

Ein weiterer Vorteil der schubweichen Zwischenschicht besteht in deren deutlich höherer Dämpfung. Somit können Schwingungen im Betrieb durch die strukturinhärente hohe Dämpfung deutlich reduziert werden.Another advantage of the shear-soft intermediate layer is its significantly higher attenuation. Thus, vibrations during operation can be significantly reduced by the structurally inherent high damping.

Bevorzugt besteht die Zwischenschicht aus Elastomeren, etwa aus Ethylen-Propylen-Dien-Monomer (EPDM). Elastomere weisen extrem hohe Bruchdehnungen von bis zu mehreren 100 % auf und können damit die verschiedenen Wärmedehnungen zwischen dem FKV-Außenrohr und dem inneren metallischen Liner hervorragend überbrücken. Darüber hinaus weisen viele Elastomere im Hinblick auf die Anwendung eine ausreichende thermische Beständigkeit auf. So etwa haben EPDM-Elastomere gewöhnlich einen Dauereinsatztemperaturbereich von -40°C bis +90°C. Darüber hinaus weist EPDM eine sehr gute Alterungsbeständigkeit bei UV- bzw. Ozon-Belastung auf.Preferably, the intermediate layer consists of elastomers, such as ethylene-propylene-diene monomer (EPDM). Elastomers have extremely high elongations at break of up to several 100% and can thus excellently bridge the different thermal expansions between the FRP outer tube and the inner metallic liner. In addition, many elastomers have sufficient thermal resistance to application. For example, EPDM elastomers usually have a continuous service temperature range of -40 ° C to + 90 ° C. In addition, EPDM has a very good aging resistance under UV or ozone load.

Weiterhin bevorzugt besteht die Zwischenschicht aus thermoplastischen Elastomeren (TPE), welche die Verarbeitungsvorteile der Thermoplaste mit den Werkstoffeigenschaften der Elastomere verbinden. Im Unterschied zu reinen Elastomeren können TPE aufgeschmolzen werden und ermöglichen dadurch eine einfache Herstellung der Zwischenschicht.Further preferably, the intermediate layer of thermoplastic elastomers (TPE), which combine the processing advantages of thermoplastics with the material properties of the elastomers. In contrast to pure elastomers TPE can be melted, thereby enabling easy production of the intermediate layer.

Aus der Gruppe der TPE eignen sich etwa thermoplastische Elastomere auf Urethanbasis (TPU) oder auf Olefinbasis (TPO). Darüber hinaus eignen sich auch thermoplastische Copolyester (TPC) oder Styrol-Blockpolymeren (TPS) aus der Gruppe der TPE.From the group of TPE are suitable for example thermoplastic elastomers based on urethane (TPU) or olefin (TPO). In addition, thermoplastic copolyesters (TPC) or styrene block polymers (TPS) from the group of TPE are also suitable.

Weiterhin besteht das Außenrohr bevorzugt aus mehreren Schichten faserverstärktem Kunststoff. Vorteilhaft können so die strukturmechanischen Eigenschaften des Außenrohrs sehr gut an die zu erwartenden Belastungen angepasst werden.Furthermore, the outer tube preferably consists of several layers of fiber-reinforced plastic. Advantageously, the structural mechanical properties of the outer tube can be adapted very well to the expected loads.

Weiterhin bevorzugt ist der metallische Liner aus Stahl gefertigt ist. Vorteilhaft ist Stahl kostengünstig verfügbar und hat sehr gute tribologische Eigenschaften.Further preferably, the metallic liner is made of steel. Advantageously, steel is available at low cost and has very good tribological properties.

Weiterhin bevorzugt hat der metallische Innenliner eine Wandstärke zwischen 0,1 mm und 1 mm.Further preferably, the metallic inner liner has a wall thickness between 0.1 mm and 1 mm.

Nicht zuletzt hat die Zwischenschicht eine bevorzugte Wandstärke zwischen 0,1 mm und 0,4 mm.Last but not least, the intermediate layer has a preferred wall thickness between 0.1 mm and 0.4 mm.

Die erfindungsgemäße Fertigung des Zylinderrohrs, das aus dem FKV-Außenrohr, dem metallischen Liner und der schubweichen Zwischenschicht besteht, kann wie folgt durchgeführt werden. Zuerst erfolgt die Fertigung des dünnwandigen metallischen Liners mithilfe klassischer Herstellungsverfahren für metallische Rohre, wie etwa im Drückwalzverfahren.The inventive production of the cylinder tube, which consists of the FKV outer tube, the metallic liner and the shear soft intermediate layer can be carried out as follows. First, the thin-walled metallic liner is manufactured using classical metallic tube manufacturing techniques such as the spin forming process.

Danach erfolgt die Auftragung der schubweichen Zwischenschicht aus Elastomer bzw. TPE auf die Außenseite des dünnwandigen metallischen Liners, wobei gewöhnlich zunächst ein handelsüblicher dünnflüssiger Haftvermittler (Primer) auf die Außenseite des metallischen Liners appliziert wird. Dieser Haftvermittler dient zur Erzielung einer guten Haftfestigkeit zwischen dem metallischen Liner und der schubweichen Zwischenschicht aus Elastomer bzw. TPE. Der dünnwandige Liner kann während des Auftrags des Primers und der schubweichen Zwischenschicht durch einen Stützkern von innen stabilisiert werden. Dieser Stützkern ist dabei bevorzugt ein Metall- oder Kunststoffzylinder, der z. Bsp. in den zylindrischen Liner eingeschoben werden kann und nach dem Auftragen der Zwischenschicht wieder entfernt wird. Als Stützkern kann aber auch der Wickel- bzw. Flechtkern genutzt werden, der später zur Herstellung des FKV-Außenrohrs genutzt wird.Thereafter, the application of the shear soft intermediate layer of elastomer or TPE takes place on the outside of the thin-walled metallic liner, usually first a commercial low-viscosity primer (primer) is applied to the outside of the metallic liner. This adhesion promoter serves to achieve a good adhesive strength between the metallic liner and the shear-soft intermediate layer of elastomer or TPE. The thin-walled liner can be stabilized from the inside during the application of the primer and the shear-soft intermediate layer by a support core. This support core is preferably a metal or plastic cylinder, the z. For example, can be inserted into the cylindrical liner and is removed again after the application of the intermediate layer. As a support core but also the winding or braided core can be used, which is later used for the production of FKV outer tube.

Insbesondere bei Zwischenschichten aus TPE können verschiedene Verarbeitungsverfahren genutzt werden, um die Zwischenschicht aufzubringen. So etwa kann der metallische Liner mit TPE umspritzt werden. Eine weitere Möglichkeit besteht in der Verwendung von TPE-Folien, die um den metallischen Liner gewickelt werden und durch kurzzeitige Temperaturerhöhung und anschließende Abkühlung aufgeschmolzen und konsolidiert werden.Especially with intermediate layers of TPE, various processing methods can be used to apply the intermediate layer. For example, the metallic liner can be overmoulded with TPE. Another possibility is the use of TPE films, which are wound around the metallic liner and melted and consolidated by brief temperature increase and subsequent cooling.

Nach der Applikation der schubweichen Zwischenschicht wird der metallische Liner bevorzugt auf einen Wickel- bzw. Flechtkern geschoben, der zur anschließenden Fertigung des FKV-Außenrohrs im Wickel- bzw. Flechtverfahren dient. Dabei wird der metallische Liner mit Zwischenschicht quasi "eingewickelt" bzw. eingeflochten. Das Wickelverfahren erfolgt gewöhnlich mit vorimprägnierten Fasern, sodass keine anschließende Infiltration mit Harz erforderlich ist. Demgegenüber erfolgt das Flechtverfahren im Allgemeinen mit trockenen Fasern, sodass eine anschließende Infiltration in einem geschlossenen Werkzeugsystem erforderlich ist.After the application of the shear-soft intermediate layer of the metallic liner is preferably pushed onto a winding or braided core, the subsequent production the FKV outer tube in the winding or braiding process is used. The metallic liner with intermediate layer is quasi "wrapped" or interwoven. The winding process is usually done with preimpregnated fibers so that no subsequent resin infiltration is required. In contrast, the braiding process is generally done with dry fibers, so that subsequent infiltration in a closed tooling system is required.

Ein Ausführungsbeispiel der Erfindung wird nachfolgend anhand von Figuren erläutert, dabei zeigen:

Figur 1
ein erfindungsgemäßes Zylinderrohr mit Darstellung der einzelnen Schichten,
Figur 2
das Zylinderrohr mit Schnittdarstellung dessen Endes mit verschiedenen Temperaturen.
An embodiment of the invention will be explained with reference to figures, in which:
FIG. 1
an inventive cylinder tube with representation of the individual layers,
FIG. 2
the cylinder tube with sectional view of the end with different temperatures.

Figur 1 zeigt den Aufbau eines erfindungsgemäßen Zylinderrohres 1. Dieses hat ein Außenrohr bestehend aus mehreren Faserlagen 11, mit verschiedenen Faserorientierungen. Die gesamte Wandstärke des durch die Faserlagen 11 gebildeten Außenrohres beträgt 7 mm. FIG. 1 shows the structure of a cylinder tube according to the invention 1. This has an outer tube consisting of several fiber layers 11, with different fiber orientations. The total wall thickness of the outer tube formed by the fiber layers 11 is 7 mm.

Innenseitig hat das Zylinderrohr 1 einen metallischen Liner 13 aus Edelstahl mit einer Wandstärke von 0,4 mm. Zwischen den Faserlagen 11 und dem metallischen Liner 13 ist eine Zwischenschicht 12 aus thermoplastischem Polyurethan (TPU) mit einer Schichtdicke von 0,2 mm angeordnet. Der Innendurchmesser des Zylinderrohres 1 Di beträgt 85 mm.On the inside, the cylinder tube 1 has a metallic liner 13 made of stainless steel with a wall thickness of 0.4 mm. Between the fiber layers 11 and the metallic liner 13, an intermediate layer 12 of thermoplastic polyurethane (TPU) with a layer thickness of 0.2 mm is arranged. The inner diameter of the cylinder tube 1 D i is 85 mm.

Aus dem Zylinderrohr 1 wird ein Leichtbau-Hydraulikaktuator mit einem Kolbenhub von 400 mm und einem Betriebsdruck von 207 bar hergestellt.From the cylinder tube 1, a lightweight hydraulic actuator with a piston stroke of 400 mm and an operating pressure of 207 bar is produced.

Figur 2 zeigt eine Schnittdarstellung in der Schnittebene A-A durch das Zylinderrohr 1, aufweisend einen Innendurchmesser Di und einen Außendurchmesser Da bei verschiedenen Temperaturen. Auf der linken Seite der Schnittdarstellung sind die Faserlagen 11, die Zwischenschicht 12 und der metallische Liner 13 gleich lang. Die Erhöhung der Temperatur resultiert auf der rechten Seite in einer Verlängerung des metallischen Liners 13 um die Längendifferenz 2. Durch die schubweiche Zwischenschicht 12 kann der Dehnungsunterschied mit der Länge 2 ausgeglichen werden, und Faserlagen 11 und metallischer Liner 13 bleiben trotz unterschiedlicher Länge verbunden. FIG. 2 shows a sectional view in the sectional plane AA through the cylinder tube 1, comprising an inner diameter D i and an outer diameter D a at different temperatures. On the left side of the sectional view, the fiber layers 11, the intermediate layer 12 and the metallic liner 13 are the same length. The increase in temperature results on the right side in an extension of the metallic liner 13 by the difference in length 2. The shear-soft intermediate layer 12, the elongation difference can be compensated with the length 2, and fiber layers 11 and metallic liner 13 remain connected despite different lengths.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Zylinderrohrcylinder tube
1111
Faserlagefiber layer
1212
Zwischenschichtinterlayer
1313
Metallischer LinerMetallic liner
22
Längendifferenzlength difference
Di D i
Innendurchmesser des Zylinderrohres 1Inner diameter of the cylinder tube 1
Da D a
Außendurchmesser des Zylinderrohres 1Outer diameter of the cylinder tube 1

Claims (15)

Zylinderrohr (1) für einen Hydraulik- oder Pneumatikzylinder aufweisend ein Außenrohr aus faserverstärktem Kunststoff und einen inneren metallischen Liner(13), wobei metallischer Liner (13) und Außenrohr durch eine schubweiche Zwischenschicht (12) verbunden sind.Cylinder tube (1) for a hydraulic or pneumatic cylinder comprising an outer tube made of fiber-reinforced plastic and an inner metallic liner (13), wherein metallic liner (13) and outer tube are connected by a shear-soft intermediate layer (12). Zylinderrohr (1) nach Anspruch 1, dadurch gekennzeichnet, dass die Zwischenschicht (12) aus Elastomer besteht.Cylinder tube (1) according to claim 1, characterized in that the intermediate layer (12) consists of elastomer. Zylinderrohr (1) nach Anspruch 1, dadurch gekennzeichnet, dass die Zwischenschicht (12) aus einem thermoplastischen Elastomer (TPE) besteht.Cylinder tube (1) according to claim 1, characterized in that the intermediate layer (12) consists of a thermoplastic elastomer (TPE). Zylinderrohr (1) nach Anspruch 3, dadurch gekennzeichnet, dass das thermoplastische Elastomer (TPE) eine Urethanbasis (TPU) oder Olefinbasis (TPO), auch in vernetztem Zustand (TPV), hat oder ein thermoplastisches Copolyester (TPC) oder ein Styrol-Blockpolymer (TPS) ist.Cylinder tube (1) according to claim 3, characterized in that the thermoplastic elastomer (TPE) is a urethane (TPU) or olefin (TPO), also in the crosslinked state (TPV), having a or a thermoplastic copolyester (TPC) or a styrene block polymer (TPS) is. Zylinderrohr (1) nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass das Außenrohr mehrere Faserlagen (11) aufweist.Cylinder tube (1) according to one of the preceding claims, characterized in that the outer tube has a plurality of fiber layers (11). Zylinderrohr (1) nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der innere metallische Liner (13) aus Stahl gefertigt ist.Cylinder tube (1) according to one of the preceding claims, characterized in that the inner metallic liner (13) is made of steel. Zylinderrohr (1) nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der innere metallische Liner (13) eine Dicke zwischen 0,1 mm und 1 mm hat.Cylinder tube (1) according to one of the preceding claims, characterized in that the inner metallic liner (13) has a thickness between 0.1 mm and 1 mm. Zylinderrohr (1) nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Zwischenschicht (12) eine Wandstärke zwischen 0,1 mm und 0,4 mm hat.Cylinder tube (1) according to one of the preceding claims, characterized in that the intermediate layer (12) has a wall thickness between 0.1 mm and 0.4 mm. Verfahren zur Herstellung eines Zylinderrohres (1) nach einem der vorangehenden Ansprüche, gekennzeichnet durch die folgenden Verfahrensschritte: a) Bereitstellung eines dünnwandigen metallischen Liners (13), b) Aufbringen der schubweichen Zwischenschicht (12) auf die Außenseite des metallischen Liners (13), c) Fertigung des FKV-Außenrohres mittels Wickeln oder Flechten auf die schubweiche Zwischenschicht (12), d) Konsolidierung des Zylinderrohres (1). Method for producing a cylinder tube (1) according to one of the preceding claims, characterized by the following method steps: a) providing a thin-walled metallic liner (13), b) applying the push-soft intermediate layer (12) to the outside of the metallic liner (13), c) production of the FKV outer tube by means of winding or braiding on the shear-soft intermediate layer (12), d) consolidation of the cylinder tube (1). Verfahren nach Anspruch 9, dadurch gekennzeichnet, dass vor dem Aufbringen der schubweichen Zwischenschicht (1) in Schritt b) ein Haftvermittler auf den metallischen Liner (13) aufgebracht wird.A method according to claim 9, characterized in that prior to the application of the shear soft intermediate layer (1) in step b) a bonding agent is applied to the metallic liner (13). Verfahren nach einem der Ansprüche 9 oder 10, dadurch gekennzeichnet, dass vor dem Aufbringen der schubweichen Zwischenschicht (12) in Schritt b) ein Kern in den metallischen Liner (13) eingebracht wird.Method according to one of claims 9 or 10, characterized in that prior to the application of the shear soft intermediate layer (12) in step b), a core is introduced into the metallic liner (13). Verfahren nach einem der Ansprüche 9 bis 11, dadurch gekennzeichnet, dass das Aufbringen der schubweichen Zwischenschicht (12) in Schritt b) durch Umspritzen des metallischen Liners (13) mit TPE oder durch Umwickeln des metallischen Liners (13) mit TPE-Folien und anschließende Konsolidierung durch kurzzeitiges Erwärmen erfolgt.Method according to one of claims 9 to 11, characterized in that the application of the shear soft intermediate layer (12) in step b) by encapsulation of the metallic liner (13) with TPE or by wrapping the metallic liner (13) with TPE films and subsequent Consolidation by brief heating takes place. Verfahren nach einem der Ansprüche 9 bis 12, dadurch gekennzeichnet, dass der Kern aus Anspruch 10 als Wickel- oder Flechtkern für die Fertigung des FKV-Außenrohres genutzt wird, oder vor der Durchführung des Schrittes c) ein Wickel- oder Flechtkern in den metallischen Liners (13) eingebracht wird.Method according to one of claims 9 to 12, characterized in that the core of claim 10 is used as a winding or braided core for the production of FKV outer tube, or prior to performing step c) a winding or braided core in the metallic liner (13) is introduced. Verfahren nach einem der Ansprüche 9 bis 13, dadurch gekennzeichnet, dass die Fertigung des FKV-Außenrohres in Schritt c) mittels Wickeln von vorimprägnierten Fasern erfolgt.Method according to one of claims 9 to 13, characterized in that the production of the FKV outer tube in step c) by means of winding preimpregnated fibers. Verfahren nach einem der Ansprüche 9 bis 13, dadurch gekennzeichnet, dass die Fertigung des FKV-Außenrohres in Schritt c) mittels Flechten von trockenen Fasern erfolgt und die anschließende Konsolidierung in Schritt d) durch eine Infiltration in einem geschlossenen Werkzeugsystem erfolgt.Method according to one of claims 9 to 13, characterized in that the manufacture of the FRP outer tube in step c) is carried out by means of braids of dry fibers and the subsequent consolidation in step d) by infiltration in a closed mold system.
EP16175751.3A 2015-06-23 2016-06-22 Cylindrical tube for a hydraulic or pneumatic cylinder Active EP3109486B1 (en)

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DE102015211545.3A DE102015211545B3 (en) 2015-06-23 2015-06-23 Cylinder tube for a hydraulic or pneumatic cylinder

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WO2018126196A1 (en) * 2016-12-29 2018-07-05 Laslo Olah Tubular protector assembly

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2879116A (en) * 1954-07-30 1959-03-24 Goetzewerke Cylinder barrel with protective coating
DE4430502A1 (en) * 1994-08-27 1996-02-29 Lingk & Sturzebecher Gmbh Use of a composite unit consisting of a liner and a fiber-reinforced plastic tube as the pressure cylinder of an actuator of the high-pressure hydraulics
DE19649133C1 (en) 1996-11-27 1998-03-05 Dornier Gmbh Hydraulic cylinder
DE10313477B3 (en) 2003-03-26 2005-01-05 Festo Ag & Co. Cylinder tube for a cylinder and method for its production
US20100077918A1 (en) * 2004-11-25 2010-04-01 Mark Metallwarenfabrik Gmbh Cylinder for high-pressure hydraulics

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3528307A1 (en) * 1985-08-07 1987-02-19 Erbsloeh Julius & August METHOD FOR PRODUCING A COMPOSITE PROFILE STICK

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2879116A (en) * 1954-07-30 1959-03-24 Goetzewerke Cylinder barrel with protective coating
DE4430502A1 (en) * 1994-08-27 1996-02-29 Lingk & Sturzebecher Gmbh Use of a composite unit consisting of a liner and a fiber-reinforced plastic tube as the pressure cylinder of an actuator of the high-pressure hydraulics
DE19649133C1 (en) 1996-11-27 1998-03-05 Dornier Gmbh Hydraulic cylinder
DE10313477B3 (en) 2003-03-26 2005-01-05 Festo Ag & Co. Cylinder tube for a cylinder and method for its production
US20100077918A1 (en) * 2004-11-25 2010-04-01 Mark Metallwarenfabrik Gmbh Cylinder for high-pressure hydraulics

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