EP0515715A1 - Linear actuation - Google Patents

Linear actuation Download PDF

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Publication number
EP0515715A1
EP0515715A1 EP91108772A EP91108772A EP0515715A1 EP 0515715 A1 EP0515715 A1 EP 0515715A1 EP 91108772 A EP91108772 A EP 91108772A EP 91108772 A EP91108772 A EP 91108772A EP 0515715 A1 EP0515715 A1 EP 0515715A1
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EP
European Patent Office
Prior art keywords
linear drive
longitudinal slot
air connection
drive according
sealing tape
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP91108772A
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German (de)
French (fr)
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EP0515715B1 (en
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Hygrama AG
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Hygrama AG
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Publication date
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Priority to DE59106274T priority Critical patent/DE59106274D1/en
Priority to EP91108772A priority patent/EP0515715B1/en
Priority to US07/852,653 priority patent/US5245910A/en
Priority to JP4087214A priority patent/JP2777306B2/en
Publication of EP0515715A1 publication Critical patent/EP0515715A1/en
Application granted granted Critical
Publication of EP0515715B1 publication Critical patent/EP0515715B1/en
Priority to HK98100413A priority patent/HK1001334A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • 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
    • F15B15/082—Characterised by the construction of the motor unit the motor being of the slotted cylinder type

Definitions

  • the invention relates to a linear drive with a longitudinally slotted cylinder housing, in the interior of which a drive element is arranged such that it can be driven to move back and forth and which extends with a lateral extension through the longitudinal slot, which seals at least on its outside by an outer sealing tape extending over the length of the housing which is lifted from the longitudinal slot in the area of the attachment and is passed through a bracket connected to the attachment.
  • Linear drives of this type are known.
  • the drive element in the interior of the cylinder housing is a piston which is sealed on the end face from the interior.
  • the longitudinal slot is also sealed on the inside by a sealing tape.
  • the piston moves due to pressure differences on both ends of the piston.
  • a linear drive in which a screw spindle is arranged within the housing and, when rotating, shifts a threaded element in the longitudinal direction.
  • a small amount of abrasion occurs when the drive element moves.
  • the outer sealing tape it is possible that in the area in which this sealing tape lifts off from the edges of the longitudinal slot, abrasion reaches the outside. This is normally not a problem.
  • the compressed air also contains small impurities that can also get into the outside space.
  • contaminants can get into the interior of the linear drive. This can be dust or particulate contaminants, for example. If the linear drive is to be used in an environment in which solvents are used, then solvents can also get into the interior of the cylinder housing and there deteriorate or destroy the lubrication used to reduce friction. The sealing of the sealing tape can also deteriorate due to deposits.
  • the invention has for its object to provide a linear drive, the scope of which is expanded so that it can be used both in clean rooms and in rooms with an aggressive environment.
  • the invention proposes in a linear drive of the type mentioned that it has an air connection which leads into the space inside the outer sealing tape and can be connected to a device for generating and maintaining a pressure from the outside of the cylinder housing prevailing pressure is different.
  • This linear drive proposed by the invention can now be used both in clean rooms and in rooms with an aggressive environment.
  • applying a pressure which is lower than the pressure in the clean room reliably prevents abrasion or contamination of the compressed air used for driving from the cylinder housing from entering the room in an uncontrolled manner.
  • These impurities are extracted by the vacuum.
  • the air connection creates and maintains a more or less strong overpressure, i.e. a pressure that is higher than the pressure outside the cylinder. In this way it is prevented that dusts or vapors get into the interior of the cylinder housing. In rooms with an aggressive environment, the slight contamination coming from inside the cylinder does not interfere.
  • the invention proposes in particular that the air connection is arranged in the region of the end of the cylinder housing, particularly preferably in the region of the longitudinal slot. In this way, the designs for the linear drives hardly need to be changed.
  • two air connections are provided, both of which are in particular arranged in the region of the end of the cylindrical housing.
  • the invention proposes in a further development that in a cylinder housing in which the longitudinal slot is sealed by an inner sealing tape, for example by the Inside the piston is passed, the air connection leads into the space between the two sealing tapes. So there is no impediment to the operation of the previous linear drive. Both when applying negative pressure and when applying positive pressure, the object on which the invention is based is reliably achieved.
  • the linear drive shown in Figure 1 contains a cylindrical housing 1 which contains a slightly eccentrically offset circular cylindrical interior 2.
  • the housing 1 is closed off by a head piece 3 on both end faces.
  • the cylindrical housing 1 has a longitudinal slot 4 which extends continuously over the entire length of the cylindrical housing 1.
  • a drive element designed as a piston 5 is arranged to be longitudinally displaceable.
  • the piston is in Area of its two ends sealed by a circumferential seal 6 against the interior 2.
  • a lateral extension 7 is attached approximately centrally with respect to its longitudinal extent, which extends through the longitudinal slot 4 to the outside.
  • a bracket 8 is attached to the extension 7, on which the movement of the piston 5 can be removed.
  • the longitudinal slot 4 is sealed on its outside by an outer sealing tape 9. On its inside, the longitudinal slot 4 is sealed by an inner sealing tape 10. Both sealing tapes 9, 10 extend in the longitudinal direction of the linear drive and are of course wider than the longitudinal slot 4. Since the sealing tapes 9, 10 are wider than the longitudinal slot 4 and the neck 7 are narrower than the longitudinal slot 4, both sealing tapes 9, 10 become in the area of the neck 7 lifted from the longitudinal slot 4 and passed outwards or inwards through the bracket 8 or the piston 5. This area, in which both sealing tapes lift off from the longitudinal slot 4, moves with the movement of the piston 5. In the example shown, the piston 5 is moved by compressed air, which is introduced into the head pieces 3 by corresponding connecting pieces. In this respect, the linear drive is known.
  • the sealing tapes are made of steel, for example, and are pressed onto the edges of the longitudinal slot using magnets.
  • the outer sealing tape 9 is clamped in the region of its two ends with the aid of a screwed-on block 11.
  • the block 11 is screwed to the housing 1 with the aid of two screws 12 with the interposition of a seal.
  • the block 11 contains a threaded bore 13 which can be connected to a nipple for a compressed air line.
  • the bore 13 leads into the space between the two sealing tapes 9, 10, since the sealing tape 9 ends in front of the bore 13 in the longitudinal direction.
  • the opposite end of the linear drive also contains such a block 11 with an air connection.
  • Figure 2 shows a plan view of the end of the linear drive on an enlarged scale.
  • the block 11 is screwed to the housing 1 directly adjacent to the head piece 3 by means of the screws 12. He clamps the end of the outer sealing tape 9.
  • FIG. 3 The same arrangement is also shown in FIG. 3.
  • a further seal 14 is interposed between the inner sealing band and the end of the block 11 on the head piece side.
  • a vacuum is applied via the bore 13 to the space between the outer and the inner sealing tape 10, that is to say a pressure which is lower than the pressure prevailing in the clean room.
  • the size of the vacuum depends on the circumstances of the individual case. If, during the movement of the piston, the compressed air contains certain impurities that get into the space between the two sealing tapes, they are sucked off without being able to get outside. Even when the lip 16 arranged on the bracket 8 slides off, any abrasion that may occur can be sucked off by the negative pressure. This applies in particular if the lip 16, which is acted upon by a round cord ring 15, is designed accordingly is.
  • the linear drive proposed by the invention is to be used in an aggressive environment, a slight excess pressure is generated by the air connection in the space between the two sealing tapes 9, 10, the height of which also depends on the circumstances of the individual case. This overpressure is reduced where dust, chips or vapors could penetrate. It therefore prevents them from entering the interior of the linear drive.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)

Abstract

Ein Linearantrieb enthält ein mit einem Längsschlitz (4) versehenes zylinderartiges Gehäuse (1). In einem Innenraum (2) ist ein Kolben (5) längsverschiebbar durch Druckunterschiede bewegbar geführt. Er greift mit einem Ansatz (7) durch den Längsschlitz (4) hindurch. Die Außenseite und die Innenseite des Längsschlitzes (4) sind duch je ein Dichtband (9, 10) abgedichtet. In den Raum zwischen den beiden Dichtbändern (9, 10) führt ein Druckluftanschluß, der in diesem Raum entweder einen Überdruck oder einen Unterdruck herstellt.

Figure imgaf001
A linear drive contains a cylindrical housing (1) provided with a longitudinal slot (4). In an interior (2), a piston (5) is guided so as to be longitudinally displaceable due to pressure differences. It engages with an extension (7) through the longitudinal slot (4). The outside and the inside of the longitudinal slot (4) are each sealed by a sealing tape (9, 10). A compressed air connection leads into the space between the two sealing tapes (9, 10), which creates either an overpressure or a vacuum in this space.
Figure imgaf001

Description

Die Erfindung betrifft einen Linearantrieb mit einem längsgeschlitzten Zylindergehäuse, in dessen Innenraum ein Antriebselement hin- und hergehend beweglich antreibbar angeordnet ist und mit einem seitlichen Ansatz durch den Längsschlitz hindurchgreift, der mindestens an seiner Außenseite durch ein sich über die Länge des Gehäuses erstreckendes äußeres Dichtband abgedichtet ist, das im Bereich des Ansatzes von dem Längsschlitz abgehoben und durch einen mit dem Ansatz verbundenen Bügel hindurchgeführt wird.The invention relates to a linear drive with a longitudinally slotted cylinder housing, in the interior of which a drive element is arranged such that it can be driven to move back and forth and which extends with a lateral extension through the longitudinal slot, which seals at least on its outside by an outer sealing tape extending over the length of the housing which is lifted from the longitudinal slot in the area of the attachment and is passed through a bracket connected to the attachment.

Linearantriebe dieser Art sind bekannt. Bei einem bekannten Typ dieses Linerantriebs ist das Antriebselement im Inneren des Zylindergehäuses ein Kolben, der stirnseitig gegenüber dem Innenraum abgedichtet ist. Auch der Längsschlitz ist auf seiner Innenseite durch ein Dichtband abgedichtet. Die Bewegung des Kolbens erfolgt durch Druckunterschiede auf beiden Stirnseiten des Kolbens.Linear drives of this type are known. In a known type of this liner drive, the drive element in the interior of the cylinder housing is a piston which is sealed on the end face from the interior. The longitudinal slot is also sealed on the inside by a sealing tape. The piston moves due to pressure differences on both ends of the piston.

Ebenfalls bekannt ist ein Linearantrieb, bei dem innerhalb des Gehäuses eine Schraubenspindel angeordnet ist, die bei Drehung ein mit einem Gewinde versehenes Element in Längsrichtung verschiebt.Also known is a linear drive, in which a screw spindle is arranged within the housing and, when rotating, shifts a threaded element in the longitudinal direction.

Bei der Bewegung des Antriebselementes entsteht in geringem Umfang ein Abrieb. Trotz des äußeren Dichtbandes ist es möglich, daß in dem Bereich, in dem dieses Dichtband von den Rändern des Längsschlitzes abhebt, Abrieb in den Außenraum gelangt. Dies ist im Normalfall auch nicht störend. Bei dem Antrieb des Kolbens durch Druckluft enthält auch die Druckluft kleine Verunreinigungen, die ebenfalls in den Außenraum gelangen können. Andererseits können auch, vor allem im Bereich des Abhebens des Dichtbandes, Verunreinigungen von der Außenseite des Linearantriebs in sein Inneres gelangen. Dabei kann es sich beispielsweise um Staub oder partikelförmige Verunreinigungen handeln. Wenn der Linearantrieb in einer Umgebung angewendet werden soll, in der Lösungsmittel, verwendet werden, so können auch Lösungsmittel in das Innere des Zylindergehäuses gelangen und dort die zur Reibungsverminderung verwendete Schmierung verschlechtern oder zerstören. Durch Ablagerungen kann sich auch die Abdichtung des Dichtbandes verschlechtern.A small amount of abrasion occurs when the drive element moves. Despite the outer sealing tape, it is possible that in the area in which this sealing tape lifts off from the edges of the longitudinal slot, abrasion reaches the outside. This is normally not a problem. When the piston is driven by compressed air, the compressed air also contains small impurities that can also get into the outside space. On the other hand, especially in the area where the sealing tape is lifted off, contaminants can get into the interior of the linear drive. This can be dust or particulate contaminants, for example. If the linear drive is to be used in an environment in which solvents are used, then solvents can also get into the interior of the cylinder housing and there deteriorate or destroy the lubrication used to reduce friction. The sealing of the sealing tape can also deteriorate due to deposits.

Der Erfindung liegt die Aufgabe zugrunde, einen Linearantrieb zu schaffen, dessen Anwendungsbereich erweitert wird, so daß er sowohl in Reinräumen als auch in Räumen mit agressiver Umgebung verwendet werden kann.The invention has for its object to provide a linear drive, the scope of which is expanded so that it can be used both in clean rooms and in rooms with an aggressive environment.

Zur Lösung dieser Aufgabe schlägt die Erfindung bei einem Linearantrieb der eingangs genannten Art vor, daß dieser einen Luftanschuß aufweist, der in den Raum innerhalb des äußeren Dichtbandes führt und mit einer Einrichtung zur Erzeugung und Aufrechterhaltung eines Drucks verbindbar ist, der von dem außerhalb des Zylindergehäuses herrschenden Druck verschieden ist.To achieve this object, the invention proposes in a linear drive of the type mentioned that it has an air connection which leads into the space inside the outer sealing tape and can be connected to a device for generating and maintaining a pressure from the outside of the cylinder housing prevailing pressure is different.

Dieser von der Erfindung vorgeschlagene Linearantrieb kann nun sowohl in Reinräumen als auch in Räumen mit agressiver Umgebung verwendet werden. Bei der Verwendung in Reinräumen wird durch Anlegen eines Drucks, der niedriger ist als der Druck in dem Reinraum, zuverlässig verhindert, daß Abrieb oder Verunreinigungen der zum Antrieb dienenden Druckluft aus dem Zylindergehäuse unkontrolliert in den Raum eintreten. Durch den Unterdruck werden diese Verunreinigungen abgesaugt.This linear drive proposed by the invention can now be used both in clean rooms and in rooms with an aggressive environment. When used in clean rooms, applying a pressure which is lower than the pressure in the clean room reliably prevents abrasion or contamination of the compressed air used for driving from the cylinder housing from entering the room in an uncontrolled manner. These impurities are extracted by the vacuum.

Handelt es sich dagegen um einen Raum mit agressiver Umgebung, so wird durch den Luftanschluß ein mehr oder weniger starker Überdruck erzeugt und aufrechterhalten, also ein Druck, der höher ist als der Druck außerhalb des Zylinders. Auf diese Weise wird verhindert, daß Stäube oder Dämpfe in das Innere des Zylindergehäuses gelangen. In Räumen mit agressiver Umgebung stören die aus dem Inneren des Zylinders kommenden geringen Verunreinigungen nicht.If, on the other hand, it is a room with an aggressive environment, the air connection creates and maintains a more or less strong overpressure, i.e. a pressure that is higher than the pressure outside the cylinder. In this way it is prevented that dusts or vapors get into the interior of the cylinder housing. In rooms with an aggressive environment, the slight contamination coming from inside the cylinder does not interfere.

Auf diese Weise wird ein Linearantrieb mit einfachen Mitteln so abgeändert, daß sein Anwendungsbereich vergrößert wird.In this way, a linear drive is modified with simple means so that its field of application is enlarged.

Die Erfindung schlägt insbesondere vor, daß der Luftanschluß im Bereich des Endes des Zylindergehäuses angeordnet ist, insbesondere vorzugsweise im Bereich des Längsschlitzes. Auf diese Weise brauchen die Konstruktionen für die Linearantriebe kaum geändert zu werden.The invention proposes in particular that the air connection is arranged in the region of the end of the cylinder housing, particularly preferably in the region of the longitudinal slot. In this way, the designs for the linear drives hardly need to be changed.

In Weiterbildung der Erfindung kann vorgesehen sein, daß zwei Luftanschlüsse vorhanden sind, die insbesondere beide im Bereich des Endes des zylindrischen Gehäuses angeordnet sind. Die Erfindung schlägt in Weiterbildung vor, daß bei einem Zylindergehäuse, bei dem der Längsschlitz durch ein inneres Dichtband abgedichtet ist, das beispielsweise durch das Innere des Kolbens hindurchgeführt ist, der Luftanschluß in den Raum zwischen den beiden Dichtbändern führt. Es tritt also keine Behinderung der Wirkungsweise des bisherigen Linearantriebs ein. Sowohl beim Anliegen von Unterdruck als auch beim Anliegen von Überdruck wird die der Erfindung zugrunde liegende Aufgabe sicher gelöst.In a further development of the invention it can be provided that two air connections are provided, both of which are in particular arranged in the region of the end of the cylindrical housing. The invention proposes in a further development that in a cylinder housing in which the longitudinal slot is sealed by an inner sealing tape, for example by the Inside the piston is passed, the air connection leads into the space between the two sealing tapes. So there is no impediment to the operation of the previous linear drive. Both when applying negative pressure and when applying positive pressure, the object on which the invention is based is reliably achieved.

Weitere Merkmale, Einzelheiten und Vorzüge der Erfindung ergeben sich aus den Ansprüchen, deren Wortlaut durch Bezugnahme zum Inhalt der Beschreibung gemacht wird, der folgenden Beschreibung einer bevorzugten Ausführungsform der Erfindung sowie anhand der Zeichnung. Hierbei zeigen:

Fig. 1
einen Längsschlitz durch einen Linearantrieb nach der Erfindung;
Fig. 2
eine Aufsicht auf das eine Ende des Linearantriebs in vergrößertem Maßstab;
Fig. 3
einen Teilschnitt durch das Ende des Linearantriebs der Figur 1 in vergrößtertem Maßstab.
Further features, details and advantages of the invention result from the claims, the wording of which is made by reference to the content of the description, the following description of a preferred embodiment of the invention and with reference to the drawing. Here show:
Fig. 1
a longitudinal slot through a linear drive according to the invention;
Fig. 2
a plan view of one end of the linear drive on an enlarged scale;
Fig. 3
a partial section through the end of the linear drive of Figure 1 on an enlarged scale.

Der in Figur 1 dargestellte Linearantrieb enthält ein zylindrisches Gehäuse 1, das einen leicht exzentrisch versetzten kreiszylindrischen Innenraum 2 enthält. An beiden Stirnseiten ist das Gehäuse 1 durch je ein Kopfstück 3 abgeschlossen.The linear drive shown in Figure 1 contains a cylindrical housing 1 which contains a slightly eccentrically offset circular cylindrical interior 2. The housing 1 is closed off by a head piece 3 on both end faces.

Das zylindrische Gehäuse 1 weist einen Längsschlitz 4 auf, der sich durchgehend über die gesamte Länge des zylindrischen Gehäuses 1 erstreckt.The cylindrical housing 1 has a longitudinal slot 4 which extends continuously over the entire length of the cylindrical housing 1.

Im Innenraum 2 ist ein als Kolben 5 ausgebildetes Antriebselement längs verschiebbar angeordnet. Der Kolben ist im Bereich seiner beiden Stirnenden durch je eine umlaufende Dichtung 6 gegenüber dem Innenraum 2 abgedichtet.In the interior 2, a drive element designed as a piston 5 is arranged to be longitudinally displaceable. The piston is in Area of its two ends sealed by a circumferential seal 6 against the interior 2.

An dem Kolben 5 ist etwa mittig bezüglich seiner Längserstreckung ein seitlicher Ansatz 7 befestigt, der durch den Längsschlitz 4 nach außen greift. An der Außenseite ist an dem Ansatz 7 ein Bügel 8 befestigt, an dem die Bewegung des Kolbens 5 abgenommen werden kann.On the piston 5, a lateral extension 7 is attached approximately centrally with respect to its longitudinal extent, which extends through the longitudinal slot 4 to the outside. On the outside, a bracket 8 is attached to the extension 7, on which the movement of the piston 5 can be removed.

Der Längsschlitz 4 ist an seiner Außenseite durch ein äußeres Dichtband 9 abgedichtet. An seiner Innenseite ist der Längsschlitz 4 durch ein inneres Dichtband 10 abgedichtet. Beide Dichtbänder 9, 10 erstrecken sich in Längsrichtung des Linearantriebs und sind natürlich breiter als der Längsschlitz 4. Da die Dichtbänder 9, 10 breiter als der Längsschlitz 4 und der Ansatz 7 schmaler als der Längsschlitz 4 sind, werden beide Dichtbänder 9, 10 im Bereich des Ansatzes 7 von dem Längsschlitz 4 abgehoben und nach außen bzw. nach innen durch den Bügel 8 bzw. den Kolben 5 hindurchgeführt. Dieser Bereich, in dem beide Dichtbänder von dem Längsschlitz 4 abheben, wandert mit der Bewegung des Kolbens 5. Im dargestellten Beispiel wird der Kolben 5 durch Druckluft bewegt, die durch entsprechende Anschlußstücke in den Kopfstücken 3 eingebracht wird. Insoweit ist der Linearantrieb bekannt. Die Dichtbänder bestehen beispielsweise aus Stahl und werden mit Hilfe von Magneten auf die Ränder des Längsschlitzes gedrückt.The longitudinal slot 4 is sealed on its outside by an outer sealing tape 9. On its inside, the longitudinal slot 4 is sealed by an inner sealing tape 10. Both sealing tapes 9, 10 extend in the longitudinal direction of the linear drive and are of course wider than the longitudinal slot 4. Since the sealing tapes 9, 10 are wider than the longitudinal slot 4 and the neck 7 are narrower than the longitudinal slot 4, both sealing tapes 9, 10 become in the area of the neck 7 lifted from the longitudinal slot 4 and passed outwards or inwards through the bracket 8 or the piston 5. This area, in which both sealing tapes lift off from the longitudinal slot 4, moves with the movement of the piston 5. In the example shown, the piston 5 is moved by compressed air, which is introduced into the head pieces 3 by corresponding connecting pieces. In this respect, the linear drive is known. The sealing tapes are made of steel, for example, and are pressed onto the edges of the longitudinal slot using magnets.

Das äußere Dichtband 9 wird im Bereich seiner beiden Enden mit Hilfe eines angeschraubten Klotzes 11 verklemmt. Der Klotz 11 wird mit Hilfe zweier Schrauben 12 unter Zwischenlage einer Dichtung an dem Gehäuse 1 angeschraubt. Der Klotz 11 enthält eine mit einem Gewinde versehene Bohrung 13, an die ein Nippel für eine Druckluftleitung anschließbar ist. Die Bohrung 13 führt in den Raum zwischen den beiden Dichtbändern 9, 10, da das Dichtband 9 in Längsrichtung vor der Bohrung 13 endet.The outer sealing tape 9 is clamped in the region of its two ends with the aid of a screwed-on block 11. The block 11 is screwed to the housing 1 with the aid of two screws 12 with the interposition of a seal. The block 11 contains a threaded bore 13 which can be connected to a nipple for a compressed air line. The bore 13 leads into the space between the two sealing tapes 9, 10, since the sealing tape 9 ends in front of the bore 13 in the longitudinal direction.

Das gegenüberliegende Ende des Linearantriebs enthält ebenfalls einen derartigen Klotz 11 mit einem Luftanschluß.The opposite end of the linear drive also contains such a block 11 with an air connection.

Figur 2 zeigt eine Aufsicht auf das Ende des Linearantriebs in vergrößertem Maßstab. Der Klotz 11 wird unmittelbar angrenzend an das Kopfstück 3 mit Hilfe der Schrauben 12 mit dem Gehäuse 1 verschraubt. Er klemmt dabei das Ende des äußeren Dichtbandes 9 fest.Figure 2 shows a plan view of the end of the linear drive on an enlarged scale. The block 11 is screwed to the housing 1 directly adjacent to the head piece 3 by means of the screws 12. He clamps the end of the outer sealing tape 9.

Die gleiche Anordnung zeigt auch die Figur 3. Hier ist noch zu sehen, daß zwischen dem inneren Dichtband und dem kopfstückseitigen Ende des Klotzes 11 eine weitere Dichtung 14 zwischengelegt ist.The same arrangement is also shown in FIG. 3. Here it can also be seen that a further seal 14 is interposed between the inner sealing band and the end of the block 11 on the head piece side.

Soll der von der Erfindung vorgeschlagene Linearantrieb in einem Reinraum verwendet werden, so wird über die Bohrung 13 an den Raum zwischen dem äußeren und dem inneren Dichtband 10 ein Unterdruck angelegt, also ein Druck, der niedriger ist als der im Reinraum herrschende Druck. Die Größe des Unterdrucks hängt von den Umständen des jeweiligen Einzelfalls ab. Wenn bei der Bewegung des Kolbens die Druckluft gewisse Verunreinigungen enthält, die in den Raum zwischen den beiden Dichtbändern gelangt, so werden diese abgesaugt, ohne daß sie ins Äußere gelangen können. Auch bei dem Abgleiten der an dem Bügel 8 angeordneten Lippe 16 möglicherweise entstehender Abrieb kann durch den Unterdruck abgesaugt werden. Dies gilt insbesondere dann, wenn die Lippe 16, die von einem Rundschnurring 15 beaufschlagt wird, entsprechend ausgebildet ist.If the linear drive proposed by the invention is to be used in a clean room, a vacuum is applied via the bore 13 to the space between the outer and the inner sealing tape 10, that is to say a pressure which is lower than the pressure prevailing in the clean room. The size of the vacuum depends on the circumstances of the individual case. If, during the movement of the piston, the compressed air contains certain impurities that get into the space between the two sealing tapes, they are sucked off without being able to get outside. Even when the lip 16 arranged on the bracket 8 slides off, any abrasion that may occur can be sucked off by the negative pressure. This applies in particular if the lip 16, which is acted upon by a round cord ring 15, is designed accordingly is.

Soll dagegen der von der Erfindung vorgeschlagen Linearantrieb in einer agressiven Umgebung verwendet werden, so wird durch den Luftanschluß in dem Zwischenraum zwischen den beiden Dichtbändern 9, 10 ein leichter Überdruck erzeugt, dessen Höhe sich ebenfalls nach den Umständen des Einzelfalls richtet. Dieser Überdruck baut sich an den Stellen ab, an denen ein Eindringen von Stäuben, Spänen oder Dämpfen möglich wäre. Er verhindert daher deren Eindringen in das Innere des Linearantriebs.If, on the other hand, the linear drive proposed by the invention is to be used in an aggressive environment, a slight excess pressure is generated by the air connection in the space between the two sealing tapes 9, 10, the height of which also depends on the circumstances of the individual case. This overpressure is reduced where dust, chips or vapors could penetrate. It therefore prevents them from entering the interior of the linear drive.

Claims (10)

Linearantrieb mit einem längsgeschlitzten Zylindergehäuse (1), in dessen Innenraum (2) ein Antriebselement hin- und hergehend antreibbar angeordnet ist und mit einem seitlichen Ansatz (7) durch den Längsschlitz (4) hindurchgreift, der mindestens an seiner Außenseite durch ein sich über die Länge des Gehäuses (1) erstreckendes äußeres Dichtband (9) abgedichtet ist, das im Bereich des Ansatzes (7) von dem Längsschlitz (4) abgehoben und durch einen mit dem Ansatz verbundenen Bügel (8) hindurchgeführt wird, dadurch gekennzeichnet, daß er einen Luftanschluß (13) aufweist, der in den Raum innerhalb des äußeren Dichtbandes (9) führt und mit einer Einrichtung zur Erzeugung und Aufrechterhaltung eines Drucks verbindbar ist, der von dem außerhalb des Zylindergehäuses (1) herschenden Druck verschieden ist.Linear drive with a longitudinally slotted cylinder housing (1), in the interior (2) of which a drive element is arranged so that it can be driven back and forth and which has a side extension (7) which extends through the longitudinal slot (4), which extends at least on the outside through a Length of the housing (1) extending outer sealing tape (9) is sealed, which is lifted in the region of the extension (7) from the longitudinal slot (4) and passed through a bracket (8) connected to the extension, characterized in that it has a Has air connection (13) which leads into the space inside the outer sealing tape (9) and can be connected to a device for generating and maintaining a pressure which is different from the pressure prevailing outside the cylinder housing (1). Linearantrieb nach Anspruch 1, dadurch gekennzeichnet, daß der Luftanschluß (13) im Bereich des Endes des Zylindergehäuses (1) angeordnet ist.Linear drive according to claim 1, characterized in that the air connection (13) in the region of the end of the Cylinder housing (1) is arranged. Linearantrieb nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß zwei Luftanschlüsse (13) vorhanden sind.Linear drive according to claim 1 or 2, characterized in that two air connections (13) are provided. Linearantrieb nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß bei einem Zylindergehäuse (1), bei dem der Längsschlitz (4) durch ein inneres Dichtband (10) abgedichtet ist, der Luftanschluß (13) in den Raum zwischen den beiden Dichtbändern (9, 10) führt.Linear drive according to one of the preceding claims, characterized in that in the case of a cylinder housing (1) in which the longitudinal slot (4) is sealed by an inner sealing band (10), the air connection (13) into the space between the two sealing bands (9, 10) leads. Linearantrieb nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Luftanschluß (13) im Bereich des Längsschlitzes (4) angeordnet ist.Linear drive according to one of the preceding claims, characterized in that the air connection (13) is arranged in the region of the longitudinal slot (4). Linearantrieb nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß zu seiner Verwendung in einem Reinraum an den Luftanschluß (13) ein Unterdruck angelegt wird.Linear drive according to one of the preceding claims, characterized in that a vacuum is applied to the air connection (13) for use in a clean room. Linearantrieb nach einem der Ansprüche 1 - 5, dadurch gekennzeichnet, daß zu seiner Verwendung in einer agressiven Umgebung an den Luftanschluß (13) Überdruck gelegt wird.Linear drive according to one of claims 1-5, characterized in that overpressure is applied to the air connection (13) for its use in an aggressive environment. Verfahren zum Betrieb eines Linearantriebs nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß zur Verwendung des Linearantriebs in einem Reinraum in dem Bereich innerhalb des äußeren Dichtbandes (9) ein Unterdruck angelegt und aufrechterhalten wird.Method for operating a linear drive according to one of the preceding claims, characterized in that a vacuum is applied and maintained for use of the linear drive in a clean room in the area within the outer sealing band (9). Verfahren zum Betrieb eines Linearantriebs nach einem der Ansprüche 1 - 7, dadurch gekennzeichnet, daß zur Verwendung des Linearantriebs in einer agressiven Umgebung in dem Bereich innerhalb des äußeren Dichtbandes ein Überdruck angelegt und aufrechterhalten wird.Method for operating a linear drive according to one of claims 1 to 7, characterized in that an overpressure is applied and maintained for use of the linear drive in an aggressive environment in the area within the outer sealing tape. Verfahren nach Anspruch 8 oder Anspruch 9, daß der Druck ständig, auch bei Stillstand des Antriebselements, aufrechterhalten bleibt.Method according to Claim 8 or Claim 9, that the pressure is maintained constantly, even when the drive element is at a standstill.
EP91108772A 1991-05-29 1991-05-29 Linear actuation Expired - Lifetime EP0515715B1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE59106274T DE59106274D1 (en) 1991-05-29 1991-05-29 Linear actuator.
EP91108772A EP0515715B1 (en) 1991-05-29 1991-05-29 Linear actuation
US07/852,653 US5245910A (en) 1991-05-29 1992-03-17 Rodless cylinder
JP4087214A JP2777306B2 (en) 1991-05-29 1992-04-08 Linear drive device and its operation method
HK98100413A HK1001334A1 (en) 1991-05-29 1998-01-19 Linear actuation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP91108772A EP0515715B1 (en) 1991-05-29 1991-05-29 Linear actuation

Publications (2)

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EP0515715A1 true EP0515715A1 (en) 1992-12-02
EP0515715B1 EP0515715B1 (en) 1995-08-16

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EP91108772A Expired - Lifetime EP0515715B1 (en) 1991-05-29 1991-05-29 Linear actuation

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US (1) US5245910A (en)
EP (1) EP0515715B1 (en)
JP (1) JP2777306B2 (en)
DE (1) DE59106274D1 (en)
HK (1) HK1001334A1 (en)

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EP0828083A2 (en) * 1996-09-06 1998-03-11 Deutsche Star GmbH A linear guiding unit
EP0945629A1 (en) * 1998-03-27 1999-09-29 Ab Rexroth Mecman Sealing band holder

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AT402543B (en) * 1994-11-30 1997-06-25 Hygrama Ag PISTONLESS PRESSURE CYLINDER
TW308628B (en) * 1995-12-27 1997-06-21 Toyowa Kogyo Kk A rodless power cylinder
JP3177949B2 (en) * 1997-04-29 2001-06-18 豊和工業株式会社 Rodless cylinder
SE510854C2 (en) * 1997-10-29 1999-06-28 Mecman Ab Rexroth Device on the end of a pressurized fluid cylinder and pressurized fluid cylinder comprising one or two such devices
US5996469A (en) * 1998-04-07 1999-12-07 Greenco Manufacturing Corporation Rodless power cylinder
JP3546422B2 (en) * 1999-02-23 2004-07-28 豊和工業株式会社 Connection structure between base and drive unit and linear actuator
US6857780B2 (en) * 2002-11-15 2005-02-22 Phd, Inc. Rodless slide assembly
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EP0828083A2 (en) * 1996-09-06 1998-03-11 Deutsche Star GmbH A linear guiding unit
EP0828083A3 (en) * 1996-09-06 1998-05-06 Deutsche Star GmbH A linear guiding unit
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EP0945629A1 (en) * 1998-03-27 1999-09-29 Ab Rexroth Mecman Sealing band holder

Also Published As

Publication number Publication date
EP0515715B1 (en) 1995-08-16
JPH05106612A (en) 1993-04-27
JP2777306B2 (en) 1998-07-16
HK1001334A1 (en) 1998-06-12
US5245910A (en) 1993-09-21
DE59106274D1 (en) 1995-09-21

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