EP2703653B1 - Method for producing a piston-piston rod unit and piston-piston rod unit - Google Patents

Method for producing a piston-piston rod unit and piston-piston rod unit Download PDF

Info

Publication number
EP2703653B1
EP2703653B1 EP12006232.8A EP12006232A EP2703653B1 EP 2703653 B1 EP2703653 B1 EP 2703653B1 EP 12006232 A EP12006232 A EP 12006232A EP 2703653 B1 EP2703653 B1 EP 2703653B1
Authority
EP
European Patent Office
Prior art keywords
piston rod
piston
buffer sleeve
laser
buffer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP12006232.8A
Other languages
German (de)
French (fr)
Other versions
EP2703653A1 (en
Inventor
Tobias Jene
Werner Sauer
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.)
Festo SE and Co KG
Original Assignee
Festo SE and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Festo SE and Co KG filed Critical Festo SE and Co KG
Priority to EP12006232.8A priority Critical patent/EP2703653B1/en
Priority to CN201310491210.0A priority patent/CN103671907B/en
Publication of EP2703653A1 publication Critical patent/EP2703653A1/en
Application granted granted Critical
Publication of EP2703653B1 publication Critical patent/EP2703653B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • 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
    • F15B15/1447—Pistons; Piston to piston rod assemblies
    • 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
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/22—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke
    • F15B15/222—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke having a piston with a piston extension or piston recess which throttles the main fluid outlet as the piston approaches its end position
    • 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
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/22—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke
    • F15B15/223—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke having a piston with a piston extension or piston recess which completely seals the main fluid outlet as the piston approaches its end position

Definitions

  • One in the EP 1 503 114 A1 disclosed piston-piston rod unit has a piston rod to which a piston with a central opening plugged and axially immovably fixed between two axially fixedly connected to the piston rod holding surfaces. It is at least one of Holding surfaces formed by a screwed onto an externally threaded metallic mounting portion of the piston rod, innengewindered metallic retaining ring, which is welded by a piston rod to the concentric laser weld with the piston rod.
  • the retaining ring may in this case have a multiple function and be formed so that it forms anchoring means for a piston rod coaxial with the piston.
  • the retaining ring can have a circumferential radial undercut into which the buffer piston can engage with one or more hook-like anchoring elements or other suitable anchoring elements.
  • the object of the invention is to provide a method for producing a piston-piston rod unit of the type mentioned, with which a buffer sleeve can be connected in a simple and cost-effective manner with the piston rod or to provide a piston-piston rod unit, which is cheaper to manufacture compared to conventionally manufactured piston-piston rod units.
  • the inventive method for producing a piston-piston rod unit for a fluid power device such as a working cylinder or a shock absorber, in addition to the aforementioned Steps in that the laser welding is carried out by means of laser transmission welding, that the material of the metal piston rod is heated by means of a laser beam passing through the laser-transparent material of the buffer sleeve laser beam so that it gives off the heat to the consisting of thermoplastic material buffer sleeve, whereby the thermoplastic Plastic material of the buffer sleeve is melted and flows into a previously roughened crater area on the piston rod surface of the existing metal piston rod, whereby a joint assembly between the buffer sleeve and the piston rod is formed.
  • the buffer sleeve is thus connected to the piston rod by means of a special type of laser beam welding.
  • a machining of the piston rod before attaching the buffer sleeve is therefore no longer necessary. It can be a labor-consuming and cost-intensive processing step can be saved. Furthermore, other fastening means, such as the mentioned in the prior art retaining ring is not necessary.
  • the laser beam welding or laser welding is characterized by a low, concentrated energy input into the piston rod, which causes a relatively small thermal distortion of the piston rod. Therefore, the dimensional accuracy of a piston-piston rod unit produced in this way is relatively large.
  • the buffer sleeve is made of laser-transparent material and the connection with the piston rod takes place concretely by means of laser transmission welding.
  • the material of the buffer sleeve is therefore transparent in this case for the laser wavelength of the laser used.
  • the laser can radiate through the laser-transparent material almost unhindered, whereby the buffer sleeve hardly heats up.
  • the material of the piston rod a metal such as stainless steel, on the other hand heats and releases the heat to the buffer sleeve, whereby the material of the buffer sleeve melts and flows into the previously roughened crater area on the piston rod surface, whereby a joining compound is formed.
  • the surface of the piston rod is roughened to form the roughened crater region before attaching the buffer sleeve to at least one structuring region by means of laser processing and the buffer sleeve is then positioned over the resulting structuring region.
  • the laser processing of the piston rod surface creates micro-sized craters, which are advantageous for the cohesion between the buffer sleeve and the piston rod. For example, this increases the effective contact surface between the two components.
  • the at least one patterning region can be formed on a small or large area.
  • the structuring region is expediently relatively uniform overall, so that a uniformly roughened surface results.
  • the structuring region is formed annularly over the circumference of the piston rod.
  • a plurality of annular structuring regions arranged one behind the other in the axial direction of the piston rod are lasered.
  • These annular structuring regions may also be referred to as retaining rings, although these are of course not separate components, such as the retaining ring described in the prior art.
  • the piston is also connected by means of laser beam welding to the piston rod. It is thus possible that both the piston and the at least one buffer sleeve are laser-welded to the piston rod.
  • the piston is attached to the piston rod before roughening the piston rod surface for the buffer sleeves and preferably connected thereto. Due to the fact that the piston is already positioned on the piston rod, defined structuring ranges can be defined, at which the laser processing is carried out.
  • the buffer sleeve is pressed during laser beam welding to the piston rod by means of joining force on the piston rod surface.
  • the number of structuring areas, the design and the dimensioning depend on the joining force. If the joining force is thus relatively low, it is expedient to form a plurality of structuring regions, for example a plurality of retaining rings arranged one behind the other.
  • the joining force is generated by the material of the buffer sleeve itself. This can be achieved, for example, in that the diameter of the piston rod has an excess compared to the inner diameter of the buffer sleeve. In this case, the buffer sleeve is thus under tension when it is positioned on the piston rod.
  • thermoplastic material which is polyphenylene sulfide (PPS), polyphenylenevinyl (PPV) or fiber-reinforced polyamide is used as the buffer tube material.
  • the invention further relates to a piston-piston rod unit for a fluid power device such as a working cylinder or a shock absorber, with a piston rod on which a central opening provided with a piston and connected to the piston rod such that it is fixed axially immovable , And with at least one usable in the fluid power device for damping purposes buffer sleeve which is attached to the piston rod and is connected there by means of at least one laser weld with the piston rod such that it is fixed axially immovable with respect to the piston rod.
  • a fluid power device such as a working cylinder or a shock absorber
  • the piston-piston rod unit according to the invention is characterized in that the buffer sleeve of laser-transparent thermoplastic material and the piston rod made of metal, and that between the buffer sleeve and the piston rod, a laser welding seam forming, produced by means of laser transmission welding joint composite exists, resulting from that Thermoplastic material of the buffer sleeve, which has been melted by the heat emitted by the heated by means of a laser transparent material passing through the buffer tube sleeve material of the piston rod has flowed into a previously roughened crater area on the piston rod surface of the existing metal piston rod.
  • the buffer sleeve is thus connected directly to the piston rod.
  • Other fasteners for attaching the buffer sleeve to the piston rod are not used.
  • the single FIGURE shows a partially dot-dashed section of a fluid power device 11, which is an example of a fluid operated by a power cylinder, in particular a pneumatic cylinder.
  • the fluid power device 11 has an elongated housing 12, in which a piston 13 is arranged, which divides two working chambers 14a, 14b from each other while sealing.
  • the piston 13 can be moved axially.
  • the movement of the piston 13 can be tapped outside of the housing 12 on a piston rod 15, which passes through one or both end-side end walls of the housing 12 under sealing, and with the piston 13 to a piston-piston rod unit 16 designated unit is summarized.
  • the piston rod 15 thus makes the movement of the piston 13 directly with.
  • the piston-piston rod unit 16 can also be used in other fluid power devices use, for example in shock absorbers, where in the piston rod 15 to be damped shocks are initiated.
  • the piston 13 has a central opening, with which it is attached to the piston rod 15 coaxially.
  • the piston rod 15 is made of metal, for example made of stainless steel or aluminum.
  • the piston 13 is connected to the piston rod 15 by means of laser beam welding. This can be done for example by two concentric in the axial direction of the piston rod 15 laser welds 17a, 17b.
  • the piston-piston rod unit further has at least one buffer sleeve 18, which is used in the fluid power device 11 for damping purposes in the end position damping of the piston-piston rod unit 16.
  • two buffer sleeves 18 are provided, which are attached to the left and right of the piston 13 on the piston rod 15 and are connected there in the manner explained in more detail below by means of load beam welding to the piston rod 15.
  • the buffer sleeves 18 are made of a laser-transparent material which is permeable to the wavelength of the laser used.
  • the buffer tube material is a thermoplastic material, for example Polyphenylene sulfide (PPS), polyphenylene vinyl (PPV) or fiber-reinforced polyamide, in particular Ultramid (trademark of BASF).
  • the surface of the piston rod 15 is roughened on a plurality of structuring regions 19 by means of laser processing.
  • the structuring regions 19 extend concentrically around the piston rod 15 and can therefore also be referred to as retaining rings. At the structuring regions 19 are also associated with these laser welds 20, over which the buffer sleeves 18 are laser welded in the manner explained in more detail below with the piston rod 15.
  • the piston 13 is first pushed onto the piston rod 15. It is possible that the region where the piston 13 is to be positioned on the piston rod 15 is machined before attaching the piston 13 by means of laser machining. After attaching the piston 13, this is connected by means of laser beam welding to the piston rod 15.
  • the structuring regions 19 are produced on the surface of the piston rod 15 by means of laser processing.
  • so-called annular retaining rings are alsogelasert so that 15 micro-small craters arise in the surface of the piston rod.
  • the structuring regions 19 are located on the left and on the right of the piston 13 already mounted on the piston rod 15.
  • a plurality of retaining rings arranged one behind the other in the axial direction of the piston rod 15 can be formed.
  • the buffer sleeves 18 are pushed onto the piston rod 15 until they abut with their insertion end to the piston, whereby the position of the buffer sleeves 18 is predetermined.
  • the diameter of the piston rod 15 has over the inner diameters of the buffer sleeves 18 an excess, so that the buffer sleeves 18 expand when pushed. This is readily possible, since the buffer sleeves 18, as already mentioned, are made of thermoplastic material that is elastically yielding.
  • the buffer sleeves 18 thus press in their deferred position under tension on the surface of the piston rod 15. As a result, a joining force is generated, which is used in the subsequent connection of the buffer sleeves 18 with the piston rod 15.
  • the buffer sleeves 18 are connected by means of laser transmission welding to the piston rod 15.
  • the laser beam passes through the laser-transparent material of the buffer sleeve 18 to be processed and heats the piston rod, wherein the heat is transferred from the piston rod to the buffer sleeve.
  • the material of the buffer sleeve melts in the contact area piston rod surface / buffer sleeve inner wall and flows into the formed on the holders crater area of the roughened piston rod surface.
  • the welding process can be carried out such that laser welding seams 20 are formed successively on the annular retaining rings or patterning regions 19 by means of a laser.
  • the two buffer sleeves 18 are simultaneously laser-welded to the piston rod 15 by means of two laser beams, which are each associated with one of the buffer sleeve.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Damping Devices (AREA)
  • Actuator (AREA)
  • Laser Beam Processing (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Description

Die Erfindung betrifft ein Verfahren zur Herstellung einer Kolben-Kolbenstangen-Einheit für ein fluidtechnisches Gerät, wie ein Arbeitszylinder oder ein Stoßdämpfer, wobei der Kolben eine zentrale Durchbrechung zum Aufstecken auf die Kolbenstange besitzt, und wobei die Kolben-Kolbenstangen-Einheit wenigstens eine im fluidtechnischen Gerät zu Dämpfungszwecken einsetzbare, auf die Kolbenstange aufsteckbare Pufferhülse aufweist. Die Erfindung betrifft ferner noch eine Kolben-Kolbenstangen-Einheit, das Verfahren mit folgenden Schritten:

  • Aufstecken des Kolbens (13) auf die Kolbenstange (15) und Verbinden des Kolbens (13) mit der Kolbenstange (15) derart, dass der Kolben (13) axial unbeweglich auf der Kolbenstange (15) fixiert ist,
  • Aufstecken der Pufferhülse (18) auf die Kolbenstange (15) und Verbinden der Pufferhülse (18) mit der Kolbenstange (15) mittels Laserstrahlschweißen, derart, dass die Pufferhülse (18) axial unbeweglich auf der Kolbenstange (15) fixiert ist.
The invention relates to a method for producing a piston-piston rod unit for a fluid power device, such as a working cylinder or a shock absorber, wherein the piston has a central opening for attachment to the piston rod, and wherein the piston-piston rod unit at least one in the fluidic Applicable for damping purposes, has attachable to the piston rod buffer sleeve. The invention further relates to a piston-piston rod unit, the method comprising the following steps:
  • Placing the piston (13) on the piston rod (15) and connecting the piston (13) with the piston rod (15) such that the piston (13) is fixed axially immovably on the piston rod (15),
  • Attaching the buffer sleeve (18) on the piston rod (15) and connecting the buffer sleeve (18) with the piston rod (15) by means of laser beam welding, such that the buffer sleeve (18) is fixed axially immovably on the piston rod (15).

Eine in der EP 1 503 114 A1 offenbarte Kolben-Kolbenstangen-Einheit besitzt eine Kolbenstange, auf die ein Kolben mit einer zentralen Durchbrechung aufgesteckt und zwischen zwei axial fest mit der Kolbenstange verbundenen Halteflächen axial unbeweglich fixiert ist. Dabei ist wenigstens eine der Halteflächen von einem auf einen außengewindelosen metallischen Befestigungsabschnitt der Kolbenstange aufgesteckten, innengewindelosen metallischen Haltering gebildet, der durch eine zur Kolbenstange konzentrische Laserschweißnaht mit der Kolbenstange verschweißt ist. Der Haltering kann hierbei eine Mehrfachfunktion innehaben und so ausgebildet sein, dass er Verankerungsmittel für einen zur Kolbenstange koaxialen Pufferkolben bildet. Hierzu kann der Haltering über eine umlaufende radiale Hinterschneidung verfügen, in die sich der Pufferkolben mit einem oder mehreren hakenartigen Verankerungselementen oder anderen geeigneten Verankerungselementen einrasten lässt.One in the EP 1 503 114 A1 disclosed piston-piston rod unit has a piston rod to which a piston with a central opening plugged and axially immovably fixed between two axially fixedly connected to the piston rod holding surfaces. It is at least one of Holding surfaces formed by a screwed onto an externally threaded metallic mounting portion of the piston rod, innengewindelosen metallic retaining ring, which is welded by a piston rod to the concentric laser weld with the piston rod. The retaining ring may in this case have a multiple function and be formed so that it forms anchoring means for a piston rod coaxial with the piston. For this purpose, the retaining ring can have a circumferential radial undercut into which the buffer piston can engage with one or more hook-like anchoring elements or other suitable anchoring elements.

Aus der DE 43 15 458 A1 ist eine Kolben-Kolbenstangen-Einheit der eingangs genannten Art bekannt, bei der ein Kolben auf eine Kolbenstange aufgesteckt und mittels einer Nietung axial unbeweglich auf der Kolbenstange befestigt ist. Auf die Kolbenstange ist außerdem eine Hülse aufgesteckt, die mittels einer Laserschweißung mit der Kolbenstange verbunden ist.From the DE 43 15 458 A1 is a piston-piston rod unit of the type mentioned above, in which a piston mounted on a piston rod and fixed by means of a riveting axially immovable on the piston rod. On the piston rod also a sleeve is attached, which is connected by means of a laser welding to the piston rod.

Aufgabe der Erfindung ist es, ein Verfahren zur Herstellung einer Kolben-Kolbenstangen-Einheit der eingangs erwähnten Art zu schaffen, mit dem sich eine Pufferhülse in einfacher und kostengünstiger Art und Weise mit der Kolbenstange verbinden lässt bzw. eine Kolben-Kolbenstangen-Einheit bereitzustellen, die gegenüber herkömmlich hergestellten Kolben-Kolbenstangen-Einheiten kostengünstiger herzustellen ist.The object of the invention is to provide a method for producing a piston-piston rod unit of the type mentioned, with which a buffer sleeve can be connected in a simple and cost-effective manner with the piston rod or to provide a piston-piston rod unit, which is cheaper to manufacture compared to conventionally manufactured piston-piston rod units.

Diese Aufgabe wird durch ein Verfahren zur Herstellung einer Kolben-Kolbenstangen-Einheit mit den Merkmalen des unabhängigen Anspruchs 1 gelöst. Das erfindungsgemäße Verfahren zur Herstellung einer Kolben-Kolbenstangen-Einheit für ein fluidtechnisches Gerät, wie ein Arbeitszylinder oder ein Stoßdämpfer, zeichnet sich zusätzlich zu den eingangs genannten Schritten dadurch aus, dass das Laserschweißen derart mittels Laserdurchstrahlschweißen ausgeführt wird, dass das Material der aus Metall bestehenden Kolbenstange mittels eines durch das lasertransparente Material der Pufferhülse hindurchtretenden Laserstrahls erhitzt wird, sodass es die Wärme an die aus thermoplastischem Kunststoffmaterial bestehende Pufferhülse abgibt, wodurch das thermoplastische Kunststoffmaterial der Pufferhülse angeschmolzen wird und in einen zuvor aufgerauten Kraterbereich an der Kolbenstangen-Oberfläche der aus Metall bestehenden Kolbenstange fließt, wodurch ein Fügeverbund zwischen der Pufferhülse und der Kolbenstange entsteht.This object is achieved by a method for producing a piston-piston rod unit having the features of independent claim 1. The inventive method for producing a piston-piston rod unit for a fluid power device, such as a working cylinder or a shock absorber, in addition to the aforementioned Steps in that the laser welding is carried out by means of laser transmission welding, that the material of the metal piston rod is heated by means of a laser beam passing through the laser-transparent material of the buffer sleeve laser beam so that it gives off the heat to the consisting of thermoplastic material buffer sleeve, whereby the thermoplastic Plastic material of the buffer sleeve is melted and flows into a previously roughened crater area on the piston rod surface of the existing metal piston rod, whereby a joint assembly between the buffer sleeve and the piston rod is formed.

Die Pufferhülse wird also mittels einer speziellen Art von Laserstrahlschweißen mit der Kolbenstange verbunden. Eine spanabhebende Bearbeitung der Kolbenstange vor der Befestigung der Pufferhülse ist also nicht mehr notwendig. Es kann ein arbeitsaufwendiger und damit kostenintensiver Bearbeitungsschritt eingespart werden. Ferner sind weitere Befestigungsmittel, wie beispielsweise der im Stand der Technik erwähnte Haltering nicht notwendig. Das Laserstrahlschweißen bzw. Laserschweißen zeichnet sich durch einen geringen, konzentrierten Energieeintrag in die Kolbenstange aus, was einen relativ geringen thermisch bedingten Verzug der Kolbenstange bewirkt. Daher ist die Maßgenauigkeit einer derart hergestellten Kolben-Kolbenstangen-Einheit relativ groß.The buffer sleeve is thus connected to the piston rod by means of a special type of laser beam welding. A machining of the piston rod before attaching the buffer sleeve is therefore no longer necessary. It can be a labor-consuming and cost-intensive processing step can be saved. Furthermore, other fastening means, such as the mentioned in the prior art retaining ring is not necessary. The laser beam welding or laser welding is characterized by a low, concentrated energy input into the piston rod, which causes a relatively small thermal distortion of the piston rod. Therefore, the dimensional accuracy of a piston-piston rod unit produced in this way is relatively large.

Die Pufferhülse besteht aus lasertransparentem Material und die Verbindung mit der Kolbenstange erfolgt konkret mittels Laserdurchstrahlschweißen. Das Material der Pufferhülse ist in diesem Fall also für die verwendete Laserwellenlänge des Lasers transparent. Dadurch kann der Laser nahezu ungehindert durch das lasertransparente Material hindurch strahlen, wobei sich die Pufferhülse kaum erhitzt. Das Material der Kolbenstange, ein Metall wie beispielsweise Edelstahl, wird hingegen erhitzt und gibt die Wärme an die Pufferhülse ab, wodurch das Material der Pufferhülse anschmilzt und in den zuvor aufgerauten Kraterbereich an der Kolbenstangen-Oberfläche fließt, wodurch ein Fügeverbund entsteht.The buffer sleeve is made of laser-transparent material and the connection with the piston rod takes place concretely by means of laser transmission welding. The material of the buffer sleeve is therefore transparent in this case for the laser wavelength of the laser used. As a result, the laser can radiate through the laser-transparent material almost unhindered, whereby the buffer sleeve hardly heats up. The material of the piston rod, a metal such as stainless steel, on the other hand heats and releases the heat to the buffer sleeve, whereby the material of the buffer sleeve melts and flows into the previously roughened crater area on the piston rod surface, whereby a joining compound is formed.

Weiterbildungen der Erfindung sind in den Unteransprüchen dargestellt.Further developments of the invention are shown in the subclaims.

Bei einer Weiterbildung der Erfindung wird die Oberfläche der Kolbenstange zur Bildung des aufgerauten Kraterbereiches vor dem Aufstecken der Pufferhülse an wenigstens einem Strukturierungsbereich mittels Laserbearbeitung aufgeraut und die Pufferhülse wird danach über den entstandenen Strukturierungsbereich positioniert. Durch die Laserbearbeitung der Kolbenstangen-Oberfläche entstehen mikrokleine Krater, die vorteilhaft für den Zusammenhalt zwischen der Pufferhülse und der Kolbenstange sind. Beispielsweise wird dadurch die effektive Kontaktoberfläche zwischen den beiden Bauteilen erhöht. Der wenigstens eine Strukturierungsbereich kann klein- oder großflächig ausgebildet sein. Zweckmäßigerweise ist der Strukturierungsbereich insgesamt relativ gleichmäßig, so dass eine gleichmäßig aufgeraute Oberfläche entsteht.In a development of the invention, the surface of the piston rod is roughened to form the roughened crater region before attaching the buffer sleeve to at least one structuring region by means of laser processing and the buffer sleeve is then positioned over the resulting structuring region. The laser processing of the piston rod surface creates micro-sized craters, which are advantageous for the cohesion between the buffer sleeve and the piston rod. For example, this increases the effective contact surface between the two components. The at least one patterning region can be formed on a small or large area. The structuring region is expediently relatively uniform overall, so that a uniformly roughened surface results.

In besonders bevorzugter Weise ist der Strukturierungsbereich ringförmig über den Umfang der Kolbenstange ausgebildet. Zweckmäßigerweise werden mehrere in Axialrichtung der Kolbenstange hintereinander angeordnete ringförmige Strukturierungsbereiche eingelasert. Diese ringförmigen Strukturierungsbereiche lassen sich auch als Halteringe bezeichnen, obgleich diese natürlich keine separaten Bauteile sind, wie der aus dem Stand der Technik beschriebenen Haltering.In a particularly preferred manner, the structuring region is formed annularly over the circumference of the piston rod. Advantageously, a plurality of annular structuring regions arranged one behind the other in the axial direction of the piston rod are lasered. These annular structuring regions may also be referred to as retaining rings, although these are of course not separate components, such as the retaining ring described in the prior art.

Es ist möglich, dass vor dem Aufstecken des Kolbens auch der Bereich, an dem anschließend der Kolben zu positionieren ist, mittels Laserbearbeitung aufgeraut wird.It is possible that prior to attaching the piston and the area where the piston is then to be positioned, is roughened by means of laser processing.

Bei einer Weiterbildung der Erfindung wird der Kolben ebenfalls mittels Laserstrahlschweißen mit der Kolbenstange verbunden. Es ist also möglich, dass sowohl der Kolben als auch die wenigstens eine Pufferhülse mit der Kolbenstange laserverschweißt sind.In a further development of the invention, the piston is also connected by means of laser beam welding to the piston rod. It is thus possible that both the piston and the at least one buffer sleeve are laser-welded to the piston rod.

In besonders bevorzugter Weise wird der Kolben vor dem Aufrauen der Kolbenstangen-Oberfläche für die Pufferhülsen auf die Kolbenstange aufgesteckt und vorzugsweise mit dieser verbunden. Dadurch, dass der Kolben bereits auf der Kolbenstange positioniert ist, lassen sich definierte Strukturierungsbereiche festlegen, an denen dann die Laserbearbeitung durchgeführt wird.In a particularly preferred manner, the piston is attached to the piston rod before roughening the piston rod surface for the buffer sleeves and preferably connected thereto. Due to the fact that the piston is already positioned on the piston rod, defined structuring ranges can be defined, at which the laser processing is carried out.

In besonders bevorzugter Weise wird die Pufferhülse beim Laserstrahlverschweißen mit der Kolbenstange mittels Fügekraft auf die Kolbenstangen-Oberfläche gepresst. Die Anzahl der Strukturierungsbereiche, die Ausgestaltung und die Dimensionierung sind abhängig von der Fügekraft. Ist die Fügekraft also relativ niedrig, so ist es zweckmäßig, mehrere Strukturierungsbereiche, beispielsweise mehrere hintereinander angeordnete Halteringe, auszubilden.In a particularly preferred manner, the buffer sleeve is pressed during laser beam welding to the piston rod by means of joining force on the piston rod surface. The number of structuring areas, the design and the dimensioning depend on the joining force. If the joining force is thus relatively low, it is expedient to form a plurality of structuring regions, for example a plurality of retaining rings arranged one behind the other.

In besonders bevorzugter Weise wird die Fügekraft durch das Material der Pufferhülse selbst erzeugt. Dies kann beispielsweise dadurch erzielt werden, dass der Durchmesser der Kolbenstange gegenüber dem Innendurchmesser der Pufferhülse ein Übermaß aufweist. In diesem Fall steht die Pufferhülse also unter Spannung, wenn sie auf der Kolbenstange positioniert ist.In a particularly preferred manner, the joining force is generated by the material of the buffer sleeve itself. This can be achieved, for example, in that the diameter of the piston rod has an excess compared to the inner diameter of the buffer sleeve. In this case, the buffer sleeve is thus under tension when it is positioned on the piston rod.

Bei einer Weiterbildung der Erfindung wird als Pufferhülsen-Material ein thermoplastisches Kunststoffmaterial verwendet, bei dem es sich um Polyphenylensulfid (PPS), Polyphenylenvinyl (PPV) oder faserverstärktes Polyamid handelt.In a development of the invention, a thermoplastic material which is polyphenylene sulfide (PPS), polyphenylenevinyl (PPV) or fiber-reinforced polyamide is used as the buffer tube material.

Die Erfindung betrifft ferner noch eine Kolben-Kolbenstangen-Einheit für ein fluidtechnisches Gerät wie ein Arbeitszylinder oder ein Stoßdämpfer, mit einer Kolbenstange, auf der ein mit einer zentralen Durchbrechung versehener Kolben aufgesteckt und mit der Kolbenstange derart verbunden ist, dass er axial unbeweglich fixiert ist, und mit wenigstens einer im fluidtechnischen Gerät zu Dämpfungszwecken einsetzbaren Pufferhülse, die auf die Kolbenstange aufgesteckt ist und dort mittels wenigstens einer Laserschweißnaht mit der Kolbenstange derart verbunden ist, dass sie bezüglich der Kolbenstange axial unbeweglich fixiert ist. Die erfindungsgemäße Kolben-Kolbenstangen-Einheit zeichnet sich dadurch aus, dass die Pufferhülse aus lasertransparentem thermoplastischem Kunststoffmaterial und die Kolbenstange aus Metall besteht, und dass zwischen der Pufferhülse und der Kolbenstange ein die Laserschweißnaht bildender, mittels Laserdurchstrahlschweißen erzeugter Fügeverbund vorliegt, der daraus resultiert, dass thermoplastisches Kunststoffmaterial der Pufferhülse, das durch die abgegebene Wärme des mittels eines durch das lasertransparente Material der Pufferhülse hindurchtretenden Laserstrahls erhitzten Materials der Kolbenstange aufgeschmolzen wurde, in einen zuvor aufgerauten Kraterbereich an der Kolbenstangen-Oberfläche der aus Metall bestehenden Kolbenstange geflossen ist.The invention further relates to a piston-piston rod unit for a fluid power device such as a working cylinder or a shock absorber, with a piston rod on which a central opening provided with a piston and connected to the piston rod such that it is fixed axially immovable , And with at least one usable in the fluid power device for damping purposes buffer sleeve which is attached to the piston rod and is connected there by means of at least one laser weld with the piston rod such that it is fixed axially immovable with respect to the piston rod. The piston-piston rod unit according to the invention is characterized in that the buffer sleeve of laser-transparent thermoplastic material and the piston rod made of metal, and that between the buffer sleeve and the piston rod, a laser welding seam forming, produced by means of laser transmission welding joint composite exists, resulting from that Thermoplastic material of the buffer sleeve, which has been melted by the heat emitted by the heated by means of a laser transparent material passing through the buffer tube sleeve material of the piston rod has flowed into a previously roughened crater area on the piston rod surface of the existing metal piston rod.

Die Pufferhülse ist also direkt mit der Kolbenstange verbunden. Weitere Befestigungsmittel für die Befestigung der Pufferhülse zu der Kolbenstange sind nicht eingesetzt.The buffer sleeve is thus connected directly to the piston rod. Other fasteners for attaching the buffer sleeve to the piston rod are not used.

Ein bevorzugtes Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im Folgenden näher erläutert. Die einzige Figur der Zeichnung zeigt:

  • Einen Längsschnitt durch eine gemäß dem erfindungsgemäßen Verfahren hergestellte erfindungsgemäße Kolben-Kolbenstangen-Einheit.
A preferred embodiment of the invention is illustrated in the drawing and will be explained in more detail below. The sole figure of the drawing shows:
  • A longitudinal section through a piston-piston rod unit according to the invention produced according to the inventive method.

Die einzige Figur zeigt einen teilweise strichpunktierten Ausschnitt eines fluidtechnischen Gerätes 11, bei dem es sich exemplarisch um einen durch Fluidkraft betätigten Arbeitszylinder handelt, insbesondere um einen Pneumatikzylinder. Das fluidtechnische Gerät 11 verfügt über ein längliches Gehäuse 12, in dem ein Kolben 13 angeordnet ist, der unter Abdichtung zwei Arbeitskammern 14a, 14b voneinander abteilt. Durch gesteuerte Fluidbeaufschlagung der beiden Arbeitskammern 14a, 14b über nicht näher dargestellte Gehäusekanäle lässt sich der Kolben 13 axial verschieben. Die Bewegung des Kolbens 13 kann außerhalb des Gehäuses 12 an einer Kolbenstange 15 abgegriffen werden, die eine oder beide stirnseitigen Abschlusswände des Gehäuses 12 unter Abdichtung durchsetzt, und die mit dem Kolben 13 zu einer als Kolben-Kolbenstangen-Einheit 16 bezeichneten Baueinheit zusammengefasst ist. Die Kolbenstange 15 macht also die Bewegung des Kolbens 13 unmittelbar mit.The single FIGURE shows a partially dot-dashed section of a fluid power device 11, which is an example of a fluid operated by a power cylinder, in particular a pneumatic cylinder. The fluid power device 11 has an elongated housing 12, in which a piston 13 is arranged, which divides two working chambers 14a, 14b from each other while sealing. By controlled fluid loading of the two working chambers 14a, 14b via housing channels, not shown, the piston 13 can be moved axially. The movement of the piston 13 can be tapped outside of the housing 12 on a piston rod 15, which passes through one or both end-side end walls of the housing 12 under sealing, and with the piston 13 to a piston-piston rod unit 16 designated unit is summarized. The piston rod 15 thus makes the movement of the piston 13 directly with.

Die Kolben-Kolbenstangen-Einheit 16 kann auch bei anderen fluidtechnischen Geräten Einsatz finden, beispielsweise bei Stoßdämpfern, wo in die Kolbenstange 15 zu dämpfende Stöße eingeleitet werden.The piston-piston rod unit 16 can also be used in other fluid power devices use, for example in shock absorbers, where in the piston rod 15 to be damped shocks are initiated.

Der Kolben 13 besitzt eine zentrale Durchbrechung, mit der er auf die Kolbenstange 15 koaxial aufgesteckt ist. Die Kolbenstange 15 besteht aus Metall, beispielsweise aus Edelstahl oder Aluminium.The piston 13 has a central opening, with which it is attached to the piston rod 15 coaxially. The piston rod 15 is made of metal, for example made of stainless steel or aluminum.

Wie in der Figur gezeigt, ist der Kolben 13 mittels Laserstrahlschweißen mit der Kolbenstange 15 verbunden. Dies kann beispielsweise durch zwei in Axialrichtung der Kolbenstange 15 konzentrische Laserschweißnähte 17a, 17b erfolgen.As shown in the figure, the piston 13 is connected to the piston rod 15 by means of laser beam welding. This can be done for example by two concentric in the axial direction of the piston rod 15 laser welds 17a, 17b.

Die Kolben-Kolbenstangen-Einheit besitzt ferner wenigstens eine Pufferhülse 18, die im fluidtechnischen Gerät 11 zu Dämpfungszwecken bei der Endlagendämpfung der Kolben-Kolbenstangen-Einheit 16 eingesetzt ist.The piston-piston rod unit further has at least one buffer sleeve 18, which is used in the fluid power device 11 for damping purposes in the end position damping of the piston-piston rod unit 16.

Im vorliegenden Fall sind zwei Pufferhülsen 18 vorgesehen, die links und rechts des Kolbens 13 auf die Kolbenstange 15 aufgesteckt und dort in nachstehend noch näher erläuterter Weise mittels Lasterstrahlschweißen mit der Kolbenstange 15 verbunden sind.In the present case, two buffer sleeves 18 are provided, which are attached to the left and right of the piston 13 on the piston rod 15 and are connected there in the manner explained in more detail below by means of load beam welding to the piston rod 15.

Die Pufferhülsen 18 bestehen aus einem lasertransparenten Material, das für die eingesetzte Wellenlänge des Lasers durchlässig ist. Bei dem Pufferhülsen-Material handelt es sich um ein thermoplastisches Kunststoffmaterial, beispielsweise Polyphenylensulfid (PPS), Polyphenylenvinyl (PPV) oder faserverstärktes Polyamid, insbesondere Ultramid (Marke der Fa. BASF).The buffer sleeves 18 are made of a laser-transparent material which is permeable to the wavelength of the laser used. The buffer tube material is a thermoplastic material, for example Polyphenylene sulfide (PPS), polyphenylene vinyl (PPV) or fiber-reinforced polyamide, in particular Ultramid (trademark of BASF).

Wie in der Figur zu erkennen, ist die Oberfläche der Kolbenstange 15 an mehreren Strukturierungsbereichen 19 mittels Laserbearbeitung aufgeraut. Die Strukturierungsbereiche 19 verlaufen konzentrisch um die Kolbenstange 15 und können daher auch als Halteringe bezeichnet werden. An den Strukturierungsbereichen 19 befinden sich jeweils auch diesen zugeordnete Laserschweißnähte 20, über die die Pufferhülsen 18 in nachfolgend noch näher erläuterter Weise mit der Kolbenstange 15 laserverschweißt sind.As can be seen in the figure, the surface of the piston rod 15 is roughened on a plurality of structuring regions 19 by means of laser processing. The structuring regions 19 extend concentrically around the piston rod 15 and can therefore also be referred to as retaining rings. At the structuring regions 19 are also associated with these laser welds 20, over which the buffer sleeves 18 are laser welded in the manner explained in more detail below with the piston rod 15.

Bei der Herstellung einer beispielsweise in der Figur gezeigten Kolben-Kolbenstangen-Einheit 16 wird zunächst der Kolben 13 auf die Kolbenstange 15 gesteckt. Es ist möglich, dass der Bereich, an dem der Kolben 13 auf der Kolbenstange 15 zu positionieren ist, vor dem Aufstecken des Kolbens 13 mittels Laserbearbeitung bearbeitet wird. Nach dem Aufstecken des Kolbens 13 wird dieser mittels Laserstrahlschweißen mit der Kolbenstange 15 verbunden.In the production of a piston-piston rod unit 16, shown for example in the figure, the piston 13 is first pushed onto the piston rod 15. It is possible that the region where the piston 13 is to be positioned on the piston rod 15 is machined before attaching the piston 13 by means of laser machining. After attaching the piston 13, this is connected by means of laser beam welding to the piston rod 15.

Anschließend werden an der Oberfläche der Kolbenstange 15 die Strukturierungsbereiche 19 mittels Laserbearbeitung hergestellt. Dabei werden sogenannte ringförmige Halteringe herausgelasert, so dass in der Oberfläche der Kolbenstange 15 mikrokleine Krater entstehen. Die Strukturierungsbereiche 19 liegen links und rechts des bereits auf der Kolbenstange 15 befestigten Kolbens 13. Es können beispielsweise mehrere in Axialrichtung der Kolbenstange 15 hintereinander angeordnete Halteringe ausgebildet werden. Nach der Aufrauhung der Oberfläche werden die Pufferhülsen 18 auf die Kolbenstange 15 geschoben, bis sie mit ihrem Einschubende an den Kolben anstoßen, wodurch die Lage der Pufferhülsen 18 vorgegeben ist. Der Durchmesser der Kolbenstange 15 weist gegenüber den Innendurchmessern der Pufferhülsen 18 ein Übermaß auf, so dass sich die Pufferhülsen 18 beim Aufschieben aufweiten. Dies ist ohne Weiteres möglich, da die Pufferhülsen 18 ja wie bereits erwähnt, aus thermoplastischem Kunststoffmaterial bestehen, das elastisch nachgiebig ist.Subsequently, the structuring regions 19 are produced on the surface of the piston rod 15 by means of laser processing. In this case, so-called annular retaining rings are herausgelasert so that 15 micro-small craters arise in the surface of the piston rod. The structuring regions 19 are located on the left and on the right of the piston 13 already mounted on the piston rod 15. For example, a plurality of retaining rings arranged one behind the other in the axial direction of the piston rod 15 can be formed. After roughening the surface, the buffer sleeves 18 are pushed onto the piston rod 15 until they abut with their insertion end to the piston, whereby the position of the buffer sleeves 18 is predetermined. The diameter of the piston rod 15 has over the inner diameters of the buffer sleeves 18 an excess, so that the buffer sleeves 18 expand when pushed. This is readily possible, since the buffer sleeves 18, as already mentioned, are made of thermoplastic material that is elastically yielding.

Die Pufferhülsen 18 drücken also in ihrer aufgeschobenen Lage unter Spannung auf die Oberfläche der Kolbenstange 15. Dadurch wird eine Fügekraft erzeugt, die beim anschließenden Verbinden der Pufferhülsen 18 mit der Kolbenstange 15 genutzt wird.The buffer sleeves 18 thus press in their deferred position under tension on the surface of the piston rod 15. As a result, a joining force is generated, which is used in the subsequent connection of the buffer sleeves 18 with the piston rod 15.

Anschließend werden die Pufferhülsen 18 mittels Laserdurchstrahlschweißen mit der Kolbenstange 15 verbunden. Dabei tritt der Laserstrahl durch das lasertransparente Material der zu bearbeitenden Pufferhülse 18 hindurch und erwärmt die Kolbenstange, wobei die Wärme von der Kolbenstange auf die Pufferhülse übertragen wird. Dadurch schmilzt das Material der Pufferhülse im Kontaktbereich Kolbenstangen-Oberfläche/Pufferhülsen-Innenwandung an und fließt in den an den Halterungen ausgebildeten Kraterbereich der aufgerauten Kolbenstangen-Oberfläche hinein. Dadurch entsteht ein fester Schweißverbund zwischen der Pufferhülse 18 und der Kolbenstange 15. Der Schweißvorgang kann derart erfolgen, dass nacheinander an den ringförmigen Halteringen bzw. Strukturierungsbereichen 19 mittels eines Lasers Laserschweißnähte 20 ausgebildet werden. Es ist jedoch auch möglich, dass die beiden Pufferhülsen 18 simultan mittels zweier Laserstrahlen, die jeweils einer der Pufferhülse zugeordnet sind, mit der Kolbenstange 15 laserverschweißt werden.Subsequently, the buffer sleeves 18 are connected by means of laser transmission welding to the piston rod 15. In this case, the laser beam passes through the laser-transparent material of the buffer sleeve 18 to be processed and heats the piston rod, wherein the heat is transferred from the piston rod to the buffer sleeve. As a result, the material of the buffer sleeve melts in the contact area piston rod surface / buffer sleeve inner wall and flows into the formed on the holders crater area of the roughened piston rod surface. This results in a solid welded joint between the buffer sleeve 18 and the piston rod 15. The welding process can be carried out such that laser welding seams 20 are formed successively on the annular retaining rings or patterning regions 19 by means of a laser. However, it is also possible that the two buffer sleeves 18 are simultaneously laser-welded to the piston rod 15 by means of two laser beams, which are each associated with one of the buffer sleeve.

Claims (13)

  1. Method of producing a piston-piston rod unit (16) for a fluid power device (11), such as an operating cylinder or a shock absorber, wherein the piston (13) has a central through hole for fitting on to the piston rod (15), and wherein the piston-piston rod unit (16) has at least one buffer sleeve (18), applicable in the fluid power device (11) for damping purposes and able to be fitted on to the piston rod (15), with the method having the following steps:
    - fitting the piston (13) on to the piston rod (15) and joining of the piston (13) to the piston rod (15) in such a way that the piston (13) is fixed, axially immovable, on the piston rod (15),
    - fitting the buffer sleeve (18) on the piston rod (15) and joining the buffer sleeve (18) to the piston rod (15) by laser beam welding in such a way that the buffer sleeve (18) is fixed, axially immovable, on the piston rod (15),
    characterised in that the laser beam welding is performed in such a way by means of laser transmission welding that the material of the piston rod (15) made of metal is heated by means of a laser beam passing through the transparent material of the buffer sleeve (18), so that it passes the heat to the buffer sleeve (18) made of thermoplastic material, by which means the thermoplastic material of the buffer sleeve (18) is melted and flows into a previously roughened crater area on the piston rod surface of the piston rod (15) made of metal, resulting in a mating bond between the buffer sleeve (18) and the piston rod (15).
  2. Method according to claim 1, characterised in that the surface of the piston rod (15), to form the roughened crater area before fitting-on of the buffer sleeve (18), is roughened by laser machining in at least one structuring zone (19), and the buffer sleeve (18) is then positioned over the resulting structuring zone (19).
  3. Method according to claim 2, characterised in that the structuring zone (19) is annular in shape over the extent of the piston rod (15).
  4. Method according to any of the preceding claims, characterised in that the piston (13) is joined to the piston rod (15) by means of laser beam welding.
  5. Method according to any of claims 2 to 4, characterised in that the piston (13) is fitted on to the piston rod (15) and preferably joined to it before roughening of the piston rod surface.
  6. Method according to any of the preceding claims, characterised in that the buffer sleeve (18), in the course of its joining to the piston rod (15) by means of laser transmission welding, is pressed by joining power to the piston rod surface.
  7. Method according to claim 6, characterised in that the joining power is generated by the material of the buffer sleeve (18) itself, in particular the diameter of the piston rod (15) is greater than the inside diameter of the buffer sleeve (18).
  8. Method according to any of the preceding claims, characterised in that the thermoplastic material of the buffer sleeve (18) is polyphenylene sulphide (PPS), polyphenylene vinyl (PPV) or fibre-reinforced polyamide.
  9. Method according to any of the preceding claims, characterised in that the metal of the piston rod (15) is stainless steel or aluminium.
  10. Piston-piston rod unit for a fluid power device (12) such as an operating cylinder or a shock absorber, with a piston rod (15) on to which a piston (13) provided with a central through hole is fitted and so joined to the piston rod (15) as to be fixed with axial immobility, and with at least one buffer sleeve (18), applicable in the fluid power device for damping purposes, which is fitted on to the piston rod (15) and there joined to the piston rod (15) by means of at least one laser weld seam (20) in such a way that it is fixed with axial immobility relative to the piston rod (15), characterised in that the buffer sleeve (18) is made of laser-transparent thermoplastic material and the piston rod is made of metal, and that between the buffer sleeve (18) and the piston rod (15) a mating bond forming the laser weld seam (20) and created by laser transmission welding is provided, resulting in thermoplastic material of the buffer sleeve (18), which has been melted by the emitted heat of the material of the piston rod (15) heated by a laser beam passing through the laser-transparent material of the buffer sleeve (18), flowing into a previously roughened crater area on the piston rod surface of the metal piston rod (15).
  11. Piston-piston rod unit according to claim 10, characterised in that the piston rod (15) has on its surface at least one structuring zone (19) roughened by means of laser machining, which forms the crater area and over which the buffer sleeve (18) is positioned.
  12. Piston-piston rod unit according to claim 11, characterised in that the structuring zone (19) is annular in shape over the extent of the piston rod (15).
  13. Piston-piston rod unit according to any of the preceding claims 10 to 12, characterised in that the thermoplastic material of the buffer sleeve (18) is polyphenylene sulphide (PPS), polyphenylene vinyl (PPV) or fibre-reinforced polyamide.
EP12006232.8A 2012-09-04 2012-09-04 Method for producing a piston-piston rod unit and piston-piston rod unit Not-in-force EP2703653B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP12006232.8A EP2703653B1 (en) 2012-09-04 2012-09-04 Method for producing a piston-piston rod unit and piston-piston rod unit
CN201310491210.0A CN103671907B (en) 2012-09-04 2013-09-04 Method for manufacturing piston-cylinder bar assembly and piston-cylinder bar assembly

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12006232.8A EP2703653B1 (en) 2012-09-04 2012-09-04 Method for producing a piston-piston rod unit and piston-piston rod unit

Publications (2)

Publication Number Publication Date
EP2703653A1 EP2703653A1 (en) 2014-03-05
EP2703653B1 true EP2703653B1 (en) 2017-04-12

Family

ID=46924200

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12006232.8A Not-in-force EP2703653B1 (en) 2012-09-04 2012-09-04 Method for producing a piston-piston rod unit and piston-piston rod unit

Country Status (2)

Country Link
EP (1) EP2703653B1 (en)
CN (1) CN103671907B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013008408A1 (en) * 2013-05-16 2014-11-20 Festo Ag & Co. Kg Drive unit of a fluid-actuated linear drive and method for its production
EP3133298B1 (en) * 2015-08-21 2019-02-06 Crompton Technology Group Limited Connector
JP6598083B2 (en) * 2016-12-06 2019-10-30 Ｓｍｃ株式会社 Piston assembly and fluid pressure device
CN108266425B (en) * 2017-11-14 2024-01-09 徐州永佳液压设备有限公司 Double-metal-structure piston rod and processing method thereof
CN112524048A (en) * 2019-09-18 2021-03-19 广东德昌电机有限公司 Liquid pump

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0359750A1 (en) * 1987-04-07 1990-03-28 SUNDHOLM, Göran A working cylinder
DE4315458C2 (en) * 1993-05-10 1996-12-05 Fichtel & Sachs Ag Valve for a hydraulic telescopic vibration damper
ES2115429B1 (en) * 1993-05-10 1999-02-16 Fichtel & Sachs Ag VALVE FOR A HYDRAULIC TELESCOPIC VIBRATION DAMPER.
DE10334205A1 (en) 2003-07-26 2005-02-24 Festo Ag & Co.Kg Piston-piston rod unit
CN201297378Y (en) * 2008-11-08 2009-08-26 王万法 Piston rod of piston cylinder

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
CN103671907B (en) 2018-07-20
CN103671907A (en) 2014-03-26
EP2703653A1 (en) 2014-03-05

Similar Documents

Publication Publication Date Title
EP2703653B1 (en) Method for producing a piston-piston rod unit and piston-piston rod unit
EP2121285B1 (en) Laser welding method
DE102016118109A1 (en) Joining method for pre-hole-free connection of at least one first component with a second component
DE102012013263B4 (en) Method for producing a metal wire made, annular damping element and method for producing a decoupling element with such a damping element
DE102015207518A1 (en) joining device
DE212015000312U1 (en) Joining device for connecting at least two components by means of an auxiliary joining part and laser welding
DE2916457A1 (en) FLUID DEVICE AND METHOD OF MANUFACTURING IT
EP1503114B1 (en) Piston-piston rod assembly
EP2934807B1 (en) Drive unit of a fluid-actuated linear drive and method for the production thereof
DE102006031365A1 (en) Cylinder e.g. hydraulic cylinder, tube e.g. tubular piston, producing method for lorry, involves centering tube segments such that contact surfaces are positioned opposite to each other, where segments have smaller length than piston
DE202012008320U1 (en) working cylinder
EP1415737B1 (en) Method for manufacturing a vehicle wheel
DE102006038932A1 (en) Compensation gearing device used in a motor vehicle comprises a joint with a press fit region and a gap region facing an access side before welding
EP0529419A2 (en) Capillary tube conduction system as well as the manufacture and device for manufacturing a capillary tube conduction system
DE102010031890B3 (en) Producing firmly bonded compound between a hollow profile made of steel and a component made of an aluminum material, comprises providing the hollow profile and the component, aligning the hollow profile and the component
DE102008001046B3 (en) Pipe unit, a method for producing such a pipe unit and vibration damper
DE1627453C3 (en) Friction butt welding process for joining tubular workpiece parts
DE10303853A1 (en) Method of manufacturing high pressure fuel line e.g. for diesel engines, heating of outer tube is achieved during welding of outer tube part
DE102020104529B4 (en) Device and method for the mechanical joining of hollow profiles
EP3580463A1 (en) Cylinder-piston device having at least one inner tube and at least one outer tube
DE102016000672A1 (en) Method for welding at least two components by means of laser welding
DE102017201369B4 (en) Method for permanent connection by means of an expanding rivet and expanding rivet to it
DE102015208671A1 (en) Component connector assembly
DE4315605C2 (en) Process for welding workpieces consisting of several parts
EP4357056A1 (en) Expansion clamping device and method for producing such an expansion clamping device

Legal Events

Date Code Title Description
AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20140531

RBV Designated contracting states (corrected)

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

RIC1 Information provided on ipc code assigned before grant

Ipc: F15B 15/22 20060101ALI20160928BHEP

Ipc: F15B 15/14 20060101AFI20160928BHEP

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

INTG Intention to grant announced

Effective date: 20161117

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: LANGUAGE OF EP DOCUMENT: GERMAN

REG Reference to a national code

Ref country code: AT

Ref legal event code: REF

Ref document number: 884207

Country of ref document: AT

Kind code of ref document: T

Effective date: 20170515

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 502012010007

Country of ref document: DE

REG Reference to a national code

Ref country code: NL

Ref legal event code: MP

Effective date: 20170412

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG4D

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 6

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170412

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170412

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170412

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170712

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170713

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170412

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170412

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20170925

Year of fee payment: 6

Ref country code: IT

Payment date: 20170926

Year of fee payment: 6

Ref country code: GB

Payment date: 20170724

Year of fee payment: 6

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170412

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170412

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170712

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170812

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170412

Ref country code: RS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170412

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 502012010007

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170412

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170412

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170412

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170412

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170412

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SM

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170412

26N No opposition filed

Effective date: 20180115

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170412

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170412

REG Reference to a national code

Ref country code: IE

Ref legal event code: MM4A

REG Reference to a national code

Ref country code: BE

Ref legal event code: MM

Effective date: 20170930

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170904

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170904

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170930

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170930

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170930

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170412

REG Reference to a national code

Ref country code: AT

Ref legal event code: MM01

Ref document number: 884207

Country of ref document: AT

Kind code of ref document: T

Effective date: 20170904

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170904

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20180904

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO

Effective date: 20120904

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20180904

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20180930

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CY

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170412

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20180904

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170412

REG Reference to a national code

Ref country code: DE

Ref legal event code: R082

Ref document number: 502012010007

Country of ref document: DE

Representative=s name: PATENTANWAELTE MAGENBAUER & KOLLEGEN PARTNERSC, DE

Ref country code: DE

Ref legal event code: R081

Ref document number: 502012010007

Country of ref document: DE

Owner name: FESTO SE & CO. KG, DE

Free format text: FORMER OWNER: FESTO AG & CO. KG, 73734 ESSLINGEN, DE

Ref country code: DE

Ref legal event code: R081

Ref document number: 502012010007

Country of ref document: DE

Owner name: FESTO AG & CO. KG, DE

Free format text: FORMER OWNER: FESTO AG & CO. KG, 73734 ESSLINGEN, DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170412

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170412

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170412

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20220601

Year of fee payment: 11

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 502012010007

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20240403