EP1818545A1 - Magnetic piston for pneumatic cylinder - Google Patents

Magnetic piston for pneumatic cylinder Download PDF

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Publication number
EP1818545A1
EP1818545A1 EP07001820A EP07001820A EP1818545A1 EP 1818545 A1 EP1818545 A1 EP 1818545A1 EP 07001820 A EP07001820 A EP 07001820A EP 07001820 A EP07001820 A EP 07001820A EP 1818545 A1 EP1818545 A1 EP 1818545A1
Authority
EP
European Patent Office
Prior art keywords
support element
sealing
ring
annular groove
piston
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.)
Withdrawn
Application number
EP07001820A
Other languages
German (de)
French (fr)
Inventor
Sandra Wolff
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.)
Parker Hannifin GmbH and Co KG
Original Assignee
Parker Hannifin GmbH 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 Parker Hannifin GmbH and Co KG filed Critical Parker Hannifin GmbH and Co KG
Publication of EP1818545A1 publication Critical patent/EP1818545A1/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • 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
    • F15B15/28—Means for indicating the position, e.g. end of stroke
    • F15B15/2815—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
    • F15B15/2823—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT by a screw mechanism attached to the piston
    • 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
    • F15B15/1452—Piston sealings

Definitions

  • the invention relates to a magnetic piston according to the preamble of claim 1; e.g. to operate a reed switch.
  • the support element made of aluminum, which has at its circumference a rectangular profiled annular groove for receiving the injected magnetic ring and a one-sided annular groove (so-called spring test) for eventual reception of a spring end in one-sided piston pressurization by compressed air.
  • spring test a one-sided annular groove for eventual reception of a spring end in one-sided piston pressurization by compressed air.
  • a molded onto the magnet ring guide ring made of plastic material.
  • the disadvantage of this is the relatively high metal weight of the support element and the requirement of injection or injection of magnetic and guide ring, wherein the composite of the sealing rings and the support element is produced by a bonding agent or adhesive.
  • the invention is therefore an object of the invention to provide a disadvantage of this magnetic piston of the type mentioned above, which is nimble (less sluggish) and is easier to produce than the known.
  • the piston By exchanging aluminum (Al) / polybutylene terephthalate (PBT), the piston has become lighter. To expose the guide surface, a single guide ring is no longer required.
  • the magnet ring can be prefabricated and is inserted flush only in the support element.
  • the magnetic piston according to the invention for a double-acting pneumatic cylinder which is not shown and against which the piston is sealed, whereby a cylinder-piston unit is formed, mainly from a substantially circular disk-shaped, profiled support member 10 made of plastic, namely PBT with 30th % By volume of glass microspheres, which appears ceramic; of a permanent magnetic metallic ring 12 made of NdFeB with a flat rectangular profile and two mirror-inverted, same sealing rings 14 made of PUR with V-shaped profiled annular groove 15 and one axially (with respect to the axis of rotation of the centrally pierced support member 10) and radially outwardly projecting sealing lip 16th , which show in opposite axial directions and are arranged symmetrically with respect to a central radial plane of the support element 10, wherein centered on the circumference of the support element is a circular cylindrical Guide surface 18 is formed, which slides on the wall of the cylinder.
  • the magnet ring 12 is flush in a correspondingly rectangular profiled annular groove 20 of the support element 10, which opens axially on one side to one of two rectangular steps 22, each depending on one of the two imaginary circumferential corners (which are removed by) of the support element 10 is formed are and record one of the two sealing rings 14, one of which closes the annular groove 20 and the magnetic ring 12 thus defines axially.
  • the coaxial circular cylindrical peripheral surface 22.1 of the step 22 in the magnet ring 12 and the corresponding surface 22.1 of the other step 22 are provided for producing tongue and groove joints of the sealing rings 14 with the support member 10, each having an approximately semicircular profiled annular groove 24 in the complementary profiled, radially inwardly directed projections 26 engage positively on the sealing rings 14, including the latter snapped onto the support member 10 or reared ("hitched").
  • Each sealing ring 14 is provided with an annular, three-part stop buffer 28 which forms a piece with that (14) and bears against one of the two mutually remote, parallel side surfaces 30 of the support element 10.
  • annular radial surface 22.2 which is reduced at the magnetic ring 12 to the opening surface of this receiving annular groove 20

Abstract

The piston has a support unit (10), and a permanent magnetic ring (12) supported in the support unit. Sealing rings (14) are made of a plastic material e.g. polyurethane material, and have sealing lips (16). The sealing rings are fastened at the circumference of the support unit in a force-fit manner. The support unit is made of a plastic material e.g. polybutylenetetraphthalate material, and has a cylindrical guide surface. A ring groove (20) has an inclusion that is closed using the sealing rings. The rings are connected with the support unit in a form-fit manner and are radially snapped.

Description

Die Erfindung betrifft einen Magnetkolben gemäß Oberbegriff des Anspruches 1; z.B. zum Betätigen eines Reed-Schalters.The invention relates to a magnetic piston according to the preamble of claim 1; e.g. to operate a reed switch.

Bei einem bekannten Kolben dieser Art besteht das Tragelement aus Aluminium, das an seinem Kreisumfang eine rechteckig profilierte Ringnut zur Aufnahme des eingespritzten Magnet-Ringes und eine einseitige Ringnut (sogenanntes Federnest) zur eventuellen Aufnahme eines Federendes bei einseitiger Kolbenbeaufschlagung durch Druckluft aufweist. Zwischen den beiden Dichtungslippen befindet sich ein auf den Magnet-Ring gespritzter Führungsring aus KunststoffMaterial.In a known piston of this type, the support element made of aluminum, which has at its circumference a rectangular profiled annular groove for receiving the injected magnetic ring and a one-sided annular groove (so-called spring test) for eventual reception of a spring end in one-sided piston pressurization by compressed air. Between the two sealing lips is a molded onto the magnet ring guide ring made of plastic material.

Nachteilig daran ist das relativ hohe Metallgewicht des Tragelementes sowie das Erfordernis des Ein- bzw. Aufspritzens von Magnet- und Führungsring, wobei der Verbund der Dichtungsringe und des Tragelementes durch einen Haftvermittler oder Klebstoff erzeugt wird.The disadvantage of this is the relatively high metal weight of the support element and the requirement of injection or injection of magnetic and guide ring, wherein the composite of the sealing rings and the support element is produced by a bonding agent or adhesive.

Der Erfindung liegt daher die Aufgabe zugrunde, einen diesen Nachteil vermeidenden Magnetkolben der eingangs genannten Art zu schaffen, welcher flinker (weniger träge) ist und einfacher herstellbar ist als der bekannte.The invention is therefore an object of the invention to provide a disadvantage of this magnetic piston of the type mentioned above, which is nimble (less sluggish) and is easier to produce than the known.

Diese Aufgabe ist erfindungsgemäß durch die kennzeichnenden Merkmale des Anspruches 1 gelöst.This object is achieved by the characterizing features of claim 1.

Durch den Materialaustausch Aluminium(Al)/PolyButhylenTerephthalat(PBT) ist der Kolben leichter geworden. Zur Exposition der Führungsfläche ist ein einzelner Führungsring nicht mehr erforderlich. Der Magnet-Ring kann vorgefertigt werden und wird lediglich in das Tragelement bündig eingefügt.By exchanging aluminum (Al) / polybutylene terephthalate (PBT), the piston has become lighter. To expose the guide surface, a single guide ring is no longer required. The magnet ring can be prefabricated and is inserted flush only in the support element.

Die vorgesehene formschlüssige Verbindung, die schon bei einem dem oben erwähnten bekannten Kolben ähnlichen, aus der Zeitschrift "Technischer Handel" 2001, Nr.7, S.24, bekannten Kolben (es fehlt diesem aber eine kraftschlüssige Verbindung der Dichtungsringe mit dem Tragelement) in gleicher Funktion vorhanden ist, sichert die Positionen der beiden Dichtungsringe vor und während der Herstellung der kraftschlüssigen Verbindung derselben mit dem Tragelement.The proposed positive connection, which is already in a similar to the above-mentioned known piston, from the journal "Technischer Handel" 2001, No. 7, p.24, known piston (it lacks this but a frictional connection of the sealing rings with the support member) in the same function, ensures the positions of the two sealing rings before and during the production of the frictional connection of the same with the support element.

Dieser ähnliche bekannte Kolben weist auch das kennzeichnende Merkmal des Anspruches 2 auf.This similar known piston also has the characterizing feature of claim 2.

Im Folgenden ist die Erfindung anhand einer durch die Zeichnung beispielhaft dargestellten Ausführungsform des erfindungsgemäßen Magnetkolbens im Einzelnen erläutert.In the following, the invention is explained with reference to an embodiment of the magnetic piston according to the invention by way of example illustrated by the drawing.

Es zeigt

Fig. 1
eine mehrfach vergrößerte axiale Seitenansicht der Ausführungsform
und
Fig. 2
eine Halbansicht (oben) derselben sowie einen halben axialen Längsschnitt (unten) durch die Ausführungsform
It shows
Fig. 1
a multiple enlarged axial side view of the embodiment
and
Fig. 2
a half view (top) thereof as well as a half axial longitudinal section (bottom) by the embodiment

Im Ausführungsbeispiel besteht der erfindungsgemäße Magnetkolben für einen doppelt wirkenden Pneumatikzylinder, der nicht gezeigt ist und gegen den der Kolben abzudichten ist, wobei ein Zylinder-Kolben-Aggregat entsteht, hauptsächlich aus einem im Wesentlichen kreisscheibenförmigen, profilierten Tragelement 10 aus Kunststoff, nämlich PBT mit 30 Volumen-% Mikroglaskugeln, welcher keramisch anmutet; aus einem permanentmagnetischen metallischen Ring 12 aus NdFeB mit flachrechteckigem Profil und aus zwei spiegelbildlich angeordneten, gleichen Dichtungsringen 14 aus PUR mit V-förmig profilierter Ringnut 15 sowie je einer axial (bezüglich der Rotationsachse des zentral durchbohrten Tragelementes 10) und radial nach außen vorspringenden Dichtungslippe 16, die in einander entgegengesetzte axiale Richtungen zeigen und bezüglich einer mittleren Radialebene des Tragelementes 10 symmetrisch angeordnet sind, wobei mittig am Umfang des Tragelementes eine kreiszylindrische Führungsfläche 18 ausgebildet ist, die auf der Wandung des Zylinders gleitet.In the exemplary embodiment, the magnetic piston according to the invention for a double-acting pneumatic cylinder, which is not shown and against which the piston is sealed, whereby a cylinder-piston unit is formed, mainly from a substantially circular disk-shaped, profiled support member 10 made of plastic, namely PBT with 30th % By volume of glass microspheres, which appears ceramic; of a permanent magnetic metallic ring 12 made of NdFeB with a flat rectangular profile and two mirror-inverted, same sealing rings 14 made of PUR with V-shaped profiled annular groove 15 and one axially (with respect to the axis of rotation of the centrally pierced support member 10) and radially outwardly projecting sealing lip 16th , which show in opposite axial directions and are arranged symmetrically with respect to a central radial plane of the support element 10, wherein centered on the circumference of the support element is a circular cylindrical Guide surface 18 is formed, which slides on the wall of the cylinder.

Der Magnet-Ring 12 liegt bündig in einer entsprechend rechteckig profilierten Ringnut 20 des Tragelementes 10, welche sich axial einseitig zu einer von zwei rechtwinkligen Stufen 22 öffnet, die je an einer der zwei gedachten umlaufenden Ecken (die dadurch entfernt sind) des Tragelementes 10 ausgebildet sind und einen der beiden Dichtungsringe 14 aufnehmen, von denen einer die Ringnut 20 schließt und den Magnet-Ring 12 damit axial festlegt.The magnet ring 12 is flush in a correspondingly rectangular profiled annular groove 20 of the support element 10, which opens axially on one side to one of two rectangular steps 22, each depending on one of the two imaginary circumferential corners (which are removed by) of the support element 10 is formed are and record one of the two sealing rings 14, one of which closes the annular groove 20 and the magnetic ring 12 thus defines axially.

Die koaxiale kreiszylindrische Umfangsfläche 22.1 der Stufe 22 beim Magnet-Ring 12 und die entsprechende Fläche 22.1 der anderen Stufe 22 sind zur Herstellung von Nut-Feder-Verbindungen der Dichtungsringe 14 mit dem Tragelement 10 mit je einer ungefähr halbkreisförmig profilierten Ringnut 24 versehen, in die komplementär profilierte, radial nach innen gerichtete Vorsprünge 26 an den Dichtungsringen 14 formschlüssig eingreifen, wozu letztere auf das Tragelement 10 aufgeschnappt oder aufgezogen ("aufgeknüpft") werden.The coaxial circular cylindrical peripheral surface 22.1 of the step 22 in the magnet ring 12 and the corresponding surface 22.1 of the other step 22 are provided for producing tongue and groove joints of the sealing rings 14 with the support member 10, each having an approximately semicircular profiled annular groove 24 in the complementary profiled, radially inwardly directed projections 26 engage positively on the sealing rings 14, including the latter snapped onto the support member 10 or reared ("hitched").

Jeder Dichtungsring 14 ist mit einem ringförmigen, dreiteiligen Anschlagpuffer 28 versehen, der mit jenem (14) ein Stück bildet und an einer der beiden einander abgewandten, parallelen Seitenflächen 30 des Tragelementes 10 anliegt. Dort und auch über die koaxiale ringförmige Radialfläche 22.2 (die beim Magnet-Ring 12 um die Öffnungsfläche der diesen aufnehmenden Ringnut 20 vermindert ist) der Stufe 22 besteht eine kraftschlüssige Verbindung zwischen Dichtungsring 14 und Tragelement 10, welche mittels eines handelsüblichen Klebstoffes hergestellt ist, der in seinen chemisch-physikalischen Eigenschaften den an ihn zu stellenden technischen Anforderungen genügt, z.B. durch Tempern aushärtbar ist.Each sealing ring 14 is provided with an annular, three-part stop buffer 28 which forms a piece with that (14) and bears against one of the two mutually remote, parallel side surfaces 30 of the support element 10. There and also on the coaxial annular radial surface 22.2 (which is reduced at the magnetic ring 12 to the opening surface of this receiving annular groove 20) of the step 22, there is a frictional connection between the sealing ring 14 and support member 10, which is made by means of a commercial adhesive, the in its chemical-physical properties satisfies the technical requirements placed on it, eg is curable by tempering.

Claims (3)

Abgedichteter Magnetkolben für einfach- oder doppeltwirkende Pneumatikzylinder, mit einem im Wesentlichen scheibenförmigen Tragelement(10), das eine, in einer der zwei einander entgegengesetzten Richtungen der Kolbenbewegung offene Ringnut(20) zur Aufnahme eines ringförmigen Bauteiles eines Zylinder-Kolben-Aggregates aufweist; mit einem in dem Tragelement(10) gelagerten permanentmagnetischen Ring(12) und mit einem bzw. zwei je eine Dichtungslippe(16) aufweisenden gleichen Dichtungsringen(14) aus Kunststoff(PUR)-Material, die am Umfang des Tragelementes(10) kraftschlüssig befestigt sind, dadurch gekennzeichnet, dass das Tragelement(10) hauptsächlich aus Kunststoff(PBT)-Material besteht und auf seinem Kreisumfang eine zylindrische Führungsfläche(18) aufweist; dass die Ringnut(20) den Magnet-Ring(12) enthält und zu dessen Einschluss mittels des bzw. eines der beiden Dichtungsringe(14) axial verschlossen ist; und dass jeder Dichtungsring(14) zu seiner axial wirksamen formschlüssigen Verbindung mit dem Tragelement(10) auf dieses radial aufgespritzt oder aufgeschnappt ist.A sealed magnetic piston for single- or double-acting pneumatic cylinders, comprising a substantially disc-shaped support member (10) having an annular groove (20) open in one of two opposite directions of piston movement for receiving an annular member of a cylinder-piston assembly; with one in the support element (10) mounted permanent magnetic ring (12) and with one or two sealing lips (16) each having the same sealing rings (14) made of plastic (PUR) material, which frictionally attached to the periphery of the support element (10) are, characterized in that the support element (10) consists mainly of plastic (PBT) material and has on its circumference a cylindrical guide surface (18); that the annular groove (20) contains the magnetic ring (12) and is axially closed to its inclusion by means of the or one of the two sealing rings (14); and that each sealing ring (14) is sprayed or snapped onto this axially effective positive connection with the support element (10) on this radially. ) Magnetkolben nach Anspruch 1, dadurch gekennzeichnet, dass zum Formschluss von Dichtungsring(14) und Tragelement(10) die Verbindung einer Ringnut(24) im Umfang des Tragelementes(10) und einer Feder (Vorsprung 26) am Dichtungsring(14) vorgesehen ist.) Magnetic piston according to claim 1, characterized in that for the positive connection of the sealing ring (14) and the support element (10) the connection of an annular groove (24) in the periphery of the support element (10) and a spring (projection 26) on the sealing ring (14) is provided , ) Magnetkolben nach Anspruch 1 oder 2, mit mindestens einem axial vorstehenden Anschlagpuffer(28), wobei jeder Anschlagpuffer mit einem Dichtungsring(14) ein Stück bildet und an einer der beiden einander abgewandten Seitenflächen(30) des Tragelementes(10) anliegt, wo eine gegenseitige kraftschlüssige Verbindung besteht.Magnetic piston according to claim 1 or 2, with at least one axially projecting stop buffer (28), each stop buffer with a sealing ring (14) forms a piece and on one of the two opposite side surfaces (30) of the support element (10) is applied, where a mutual non-positive connection exists.
EP07001820A 2006-02-14 2007-01-27 Magnetic piston for pneumatic cylinder Withdrawn EP1818545A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200610006677 DE102006006677A1 (en) 2006-02-14 2006-02-14 Magnetic piston for pneumatic cylinders

Publications (1)

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EP1818545A1 true EP1818545A1 (en) 2007-08-15

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DE (1) DE102006006677A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2333352A2 (en) 2009-12-10 2011-06-15 Carl Freudenberg KG Complete piston and its use
DE102018131382B3 (en) * 2018-12-07 2020-02-20 Carl Freudenberg Kg Complete pistons and their use

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012052485A1 (en) * 2010-10-22 2012-04-26 Seal-Mart Engineered Plastics Kg Piston for a pneumatic system

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0301845A1 (en) * 1987-07-31 1989-02-01 Norgren Martonair Limited Sensing system
US5224413A (en) * 1992-07-13 1993-07-06 Mosier Industries, Inc. Impact dampening means for power cylinders
US5813313A (en) * 1996-05-03 1998-09-29 Festo Kg Piston for a fluid power cylinder
EP1306584A2 (en) * 2001-10-23 2003-05-02 Carl Freudenberg KG Complete piston
DE202005010618U1 (en) * 2005-07-06 2005-09-29 Festo Ag & Co. Piston for working cylinder, comprising two plastic halves attached to both sides of metal core
DE202005013185U1 (en) * 2005-08-20 2005-11-03 Festo Ag & Co. Working cylinder piston, has main body enclosing ring shaped guide band for guide slide bearing and including two axially adjacent piston units that are held together by locking guide slide bearing with them

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4171818A (en) * 1977-04-04 1979-10-23 Ferrofluidics Corporation Dynamic lip seal using ferrofluids as sealant/lubricant
DE4320840C1 (en) * 1993-06-23 1994-12-15 Freudenberg Carl Fa Seal for a pneumatically driven piston
DE19925083A1 (en) * 1999-06-01 2000-12-14 Festo Ag & Co Piston for a working cylinder and process for its manufacture
DE29921941U1 (en) * 1999-12-15 2000-03-16 Fellinger Josef Sealing arrangement in modular design
DE10242266A1 (en) * 2002-09-12 2004-03-25 Continental Teves Ag & Co. Ohg Magnetoresistance position signal generator integrated into main brake cylinder has sensor in housing of adapter that can be varied in position at least during mounting of sensor on main cylinder

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0301845A1 (en) * 1987-07-31 1989-02-01 Norgren Martonair Limited Sensing system
US5224413A (en) * 1992-07-13 1993-07-06 Mosier Industries, Inc. Impact dampening means for power cylinders
US5813313A (en) * 1996-05-03 1998-09-29 Festo Kg Piston for a fluid power cylinder
EP1306584A2 (en) * 2001-10-23 2003-05-02 Carl Freudenberg KG Complete piston
DE202005010618U1 (en) * 2005-07-06 2005-09-29 Festo Ag & Co. Piston for working cylinder, comprising two plastic halves attached to both sides of metal core
DE202005013185U1 (en) * 2005-08-20 2005-11-03 Festo Ag & Co. Working cylinder piston, has main body enclosing ring shaped guide band for guide slide bearing and including two axially adjacent piston units that are held together by locking guide slide bearing with them

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2333352A2 (en) 2009-12-10 2011-06-15 Carl Freudenberg KG Complete piston and its use
DE102009057484A1 (en) 2009-12-10 2011-06-16 Carl Freudenberg Kg Complete piston and its use
EP2333352A3 (en) * 2009-12-10 2014-07-30 Carl Freudenberg KG Complete piston and its use
DE102018131382B3 (en) * 2018-12-07 2020-02-20 Carl Freudenberg Kg Complete pistons and their use

Also Published As

Publication number Publication date
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