EP0236748B1 - Oscillating servomotor - Google Patents

Oscillating servomotor Download PDF

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Publication number
EP0236748B1
EP0236748B1 EP87101597A EP87101597A EP0236748B1 EP 0236748 B1 EP0236748 B1 EP 0236748B1 EP 87101597 A EP87101597 A EP 87101597A EP 87101597 A EP87101597 A EP 87101597A EP 0236748 B1 EP0236748 B1 EP 0236748B1
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EP
European Patent Office
Prior art keywords
pressure medium
working
control valve
reset unit
reset
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Expired - Lifetime
Application number
EP87101597A
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German (de)
French (fr)
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EP0236748A1 (en
Inventor
Peter Richenzhagen
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AMG Antrieb und Mechanik GmbH
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AMG Antrieb und Mechanik GmbH
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Priority to AT87101597T priority Critical patent/ATE49266T1/en
Publication of EP0236748A1 publication Critical patent/EP0236748A1/en
Application granted granted Critical
Publication of EP0236748B1 publication Critical patent/EP0236748B1/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
    • F15B15/02—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member
    • F15B15/06—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member for mechanically converting rectilinear movement into non- rectilinear movement
    • F15B15/065—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member for mechanically converting rectilinear movement into non- rectilinear movement the motor being of the rack-and-pinion type

Abstract

1. Pivot drive comprising a working cylinder (1) in which a working piston (2) is guided which is adapted to be acted upon on both sides by a pneumatic or hydraulic pressure medium which is supplied via a control valve (3) and conduits (4, 5) to one of the two chambers (6, 7) on both sides of the working piston (2) and a reset unit (8) which comprises a movable wall (10) which via a reset rod (9) acts from the outside on the working piston (2) and which divides the housing (11) of the reset unit (8) into a pressure medium chamber (12) facing the working cylinder (1) and connected to a pressure medium source (13) and a spring chamber (14) remote from the working cylinder (1) and which is movable by at least one reset spring (15) against the working piston (2) and is movable against the action of the reset spring (15) by the pressure medium in the pressure medium chamber (12) away from the working piston (2), characterized in that the supply conduit (17) of the control valve (3) is connected only to the pressure medium chamber (12) of the reset unit (8) and the pressure medium is conducted from the pressure medium source via the pressure medium chamber (12) of the reset unit (8) to the control valve (3).

Description

Die Erfindung geht aus von einem Schwenkantrieb mit einem Arbeitszylinder, in dem ein Arbeitskolben geführt ist, der beidseitig von einem pneumatischen oder hydraulischen Druckmittel beaufschlagbar ist, das über ein Steuerventil und Leitungen einem der beiden Räume zu beiden Seiten des Arbeitskolbens zugeführt wird und mit einer Rückstelleinheit, die eine über eine Rückstellstange von außen auf den Arbeitskolben wirkende bewegliche Wand aufweist, welche das Gehäuse der Rückstelleinheit in einen dem Arbeitszylinder zugewandten und an eine Druckmittelquelle angeschlossenen Druckmittelraum und einen vom Arbeitszylinder abgewandten Federraum unterteilt und welche von mindestens einer Rückstellfeder gegen den Arbeitskolben bewegbar ist und die gegen die Wirkung der Rückstellfeder durch das Druckmittel im Druckmittelraum vom Arbeitskolben wegbewegbar ist.The invention relates to a rotary actuator with a working cylinder, in which a working piston is guided, which can be acted upon on both sides by a pneumatic or hydraulic pressure medium, which is supplied via a control valve and lines to one of the two rooms on both sides of the working piston and with a reset unit which has a movable wall acting on the working piston from the outside via a return rod, which divides the housing of the return unit into a pressure medium chamber facing the working cylinder and connected to a pressure medium source and a spring chamber facing away from the working cylinder and which can be moved against the working piston by at least one return spring and which can be moved away from the working piston against the action of the return spring by the pressure medium in the pressure medium space.

Schwenkantriebe dieser Art sind bekannt aus der DE-A-2 512 765, der EP-A-0 077 596 und EP-A-0 150 042.Rotary drives of this type are known from DE-A-2 512 765, EP-A-0 077 596 and EP-A-0 150 042.

Die bekannten Schwenkantriebe dienen insbesondere zum Öffnen oder Schließen von Ventilen, Hähnen, Klappen und entsprechenden Regelarmaturen, wie sie insbesondere in der chemischen Industrie Anwendung finden. Um beim Ausfall des Druckmittels die Regelarmatur in die Sicherheitssteiiuhg fahren zu können, sind diese Schwenkantriebe mit einer Rückstelleinheit versehen, welche bei Ausfall der Druckmittelenergie mit Hilfe vorgespannter Rückstellfedern den Arbeitskolben des Schwenkantriebes in eine Sicherheitsstellung drücken. Damit nicht bei jeder Hubbewegung des Arbeitskolbens die Rückstellfedem mitbewegt werden müssen, werden die Rückstellfedern ständig von der beweglichen Wand, zum Beispiel von einem Kolben oder von einer Membran, in vorgespannter Lage gehalten. Erst bei Ausfall der Druckmittelenergie drücken die Rückstellfedem die bewegliche Wand bzw. die Rückstellstange gegen den Arbeitskolben und bewegen diesen in die Sicherheitsstellung.The known rotary actuators are used in particular for opening or closing valves, taps, flaps and corresponding control fittings, as are used in particular in the chemical industry. In order to be able to move the control valve into the safety control if the pressure medium fails, these part-turn actuators are provided with a reset unit, which press the working piston of the part-turn actuator into a safety position with the help of preloaded return springs if the pressure medium energy fails. So that the return springs do not have to be moved with each stroke of the working piston, the return springs are constantly held in a pretensioned position by the movable wall, for example by a piston or by a membrane. Only when the pressure medium energy fails, the return springs press the movable wall or the return rod against the working piston and move it into the safety position.

Bei den bekannten Schwenkantrieben dieser Art besteht die Gefahr, daß bei Undichtheit des Druckmittelraumes der Rückstelleinheit der Schwenkantrieb nicht zuverlässig arbeitet und weder in eine volle Öffnungsstellung noch in eine volle Schließstellung gelangt. Ist die bewegliche Wand der Rückstelleinheit, die beispielsweise von einem Kolben mit Dichtring oder von einem Federteller mit Membranabdichtung gebildet wird, nicht zuverlässig gegenüber dem Gehäuse der Rückstelleinheit abgedichtet, dann kann der im Arbeitszylinder wirksam werdende Druck größer sein als der Druck im Druckmittelraum der Rückstelleinheit, so daß der Arbeitskolben nicht in seine volle Endstellung gelangt. Ferner ist auch nicht zuverlässig gewährleistet, daß bei weiterem Absinken des Druckes des Druckmittels der Arbeitskolben in die Sicherheitsstellung gedrückt wird.In the known swivel drives of this type, there is a risk that if the pressure medium chamber of the reset unit leaks, the swivel drive will not work reliably and will neither reach a full open position nor a full closed position. If the movable wall of the reset unit, which is formed, for example, by a piston with a sealing ring or by a spring plate with a membrane seal, is not reliably sealed against the housing of the reset unit, then the pressure that becomes effective in the working cylinder can be greater than the pressure in the pressure medium space of the reset unit, so that the working piston does not reach its full end position. Furthermore, there is also no reliable guarantee that if the pressure of the pressure medium drops further, the working piston will be pressed into the safety position.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, einen Schwenkantrieb zu schaffen, bei dem völlig sichergestellt ist, daß der Arbeitskolben zuverlässig in seine beiden Endstellungen gelangt und bei Druckabfall im Druckmittelraum der Rückstelleinheit der Schwenkantrieb in die Sicherheitsstellung gelangt.The present invention has for its object to provide a swivel drive in which it is completely ensured that the working piston reliably reaches its two end positions and reaches the safety position when the pressure in the pressure medium space of the reset unit of the swivel drive.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Zuführleitung des Steuerventils nur am Druckmittelraum der Rückstelleinheit angeschlossen und das Druckmittel von der Druckmittelquelle über den Druckmittelraum der Rückstelleinheit zum Steuerventil geführt ist.This object is achieved in that the supply line of the control valve is connected only to the pressure medium chamber of the reset unit and the pressure medium is guided from the pressure medium source via the pressure medium chamber of the reset unit to the control valve.

Damit wird das Druckmittel zuerst über die Rückstelleinheit geführt, bevor es in den Arbeitszylinder gelangt. Diese Führung des Druckmittels hat den Vorteil, daß der Druck im Druckmittelraum der Rückstelleinheit nicht kleiner sein kann als der im Arbeitszylinder.So that the pressure medium is first passed over the return unit before it gets into the working cylinder. This guidance of the pressure medium has the advantage that the pressure in the pressure medium chamber of the reset unit cannot be lower than that in the working cylinder.

Das hat zur Folge, daß der Schwenkantrieb zuverlässig in die Sicherheitsstellung bewegt wird, auch wenn der Druckmittelraum der Rückstelleinheit undicht sein sollte.The result of this is that the swivel drive is reliably moved into the safety position, even if the pressure medium space of the reset unit should leak.

Ferner wird erreicht, daß bei jedem Schaltvorgang bzw. bei jedem Hub des Arbeitskolbens auch der Druckmittelraum der Rückstelleinheit vom Druckmittel durchströmt und die bewegliche Wand der Rückstelleinheit etwas bewegt wird. Dies hat den Vorteil, daß keine Kontaktkorrosion zu befürchten ist, die bei metallischer Berührung der Rückstellstange in ihrer Führung im Zylinderdeckel oder des Rückstellkolbens an der Zylinderwand des Rückstellgehäuses infolge sehr langen Verharrens in einer Stellung entsteht.It is also achieved that with each switching operation or each stroke of the working piston, the pressure medium chamber of the reset unit also flows through the pressure medium and the movable wall of the reset unit is moved somewhat. This has the advantage that there is no fear of contact corrosion, which occurs when the reset rod comes into metallic contact with its guide in the cylinder cover or the reset piston on the cylinder wall of the reset housing as a result of very long persistence in one position.

Bei einem Schwenkantrieb mit einem Arbeitszylinder, in dem zwei Arbeitskolben gegenläufig geführt sind, ist es vorteilhaft, an beiden Enden des Arbeitszylinders je eine Rückstelleinheit anzuordnen, deren Rückstellstange jeweils auf einen Kolben des Schwenkantriebes einwirkt und die Zuführleitung des Steuerventils nur am Druckmittelraum einer Rückstelleinheit angeschlossen ist, der über eine Verbindungsleitung mit dem Druckmittelraum der anderen Rückstelleinheit verbunden ist, der seinerseits an der Druckmittelquelle angeschlossen ist, so daß das Druckmittel von der Druckmittelquelle über die beiden Druckmittelräume zum Steuerventil geführt ist.In the case of a rotary actuator with a working cylinder, in which two working pistons are guided in opposite directions, it is advantageous to arrange a reset unit at each end of the working cylinder, the reset rod of which acts on a piston of the rotary actuator and the supply line of the control valve is only connected to the pressure medium chamber of a reset unit , which is connected via a connecting line to the pressure medium chamber of the other resetting unit, which in turn is connected to the pressure medium source, so that the pressure medium is guided from the pressure medium source via the two pressure medium spaces to the control valve.

Ein derartiger Doppelkolben-Schwenkantrieb bewirkt bei kompakter Bauweise hohe Drehmomente. Insbesondere bei Verwendung eines Kolbens zur Abdichtung des Druckmittelraumes gegenüber dem zylindrischen Gehäuse der Rückstelleinheit ist die benötigte Querschnittsfläche für die Rückstelleinheit nicht wesentlich größer als die Querschnittsfläche des zugehörigen Arbeitszylinders.Such a double-piston rotary actuator produces high torques in a compact design. In particular when using a piston for sealing the pressure medium space from the cylindrical housing of the reset unit, the cross-sectional area required for the reset unit is not significantly larger than the cross-sectional area of the associated working cylinder.

Weitere Merkmale ergeben sich aus den Schutzansprüchen.Further features result from the protection claims.

In der folgenden Beschreibung werden unter Bezugnahme auf die Zeichnungen Ausführungsbeispiele der Erfindung näher erläutert. Die Zeichnungen zeigen in :

  • Fig. 1 eine Prinzipskizze des anmeldungsgemä- ßen Schwenkantriebes ;
  • Fig. 2 eine Schnittansicht eines Doppelkolben-Schwenkantriebes mit zwei Rückstelleinheiten ;
  • Fig. 3 eine Schnittansicht eines Doppelkolben-Schwenkantriebes mit zwei Rückstelleinheiten, deren bewegliche Wände als Kolben und als Rollmembran ausgebildet sind.
In the following description, exemplary embodiments of the invention are explained in more detail with reference to the drawings. The drawing show in:
  • 1 shows a schematic diagram of the swivel drive according to the application;
  • Fig. 2 is a sectional view of a double-piston swivel drive with two reset units;
  • Fig. 3 is a sectional view of a double-piston swivel drive with two reset units, the movable walls of which are designed as pistons and as a rolling diaphragm.

Die in Fig. 1 dargestellte Prinzipskizze zeigt einen Arbeitszylinder 1, in dem zwei Arbeitskolben 2 und 2' gegenläufig geführt sind. An jedem Arbeitskolben 2, 2' ist eine Zahnstange 20 und 20' angeordnet, die gemeinsam in ein Ritzel eingreifen, das auf einer verschwenkbaren Welle 21 befestigt ist.The basic sketch shown in Fig. 1 shows a working cylinder 1, in which two working pistons 2 and 2 'are guided in opposite directions. A toothed rack 20 and 20 'is arranged on each working piston 2, 2', which engage together in a pinion which is fastened on a pivotable shaft 21.

Die beiden Arbeitskolben 2 und 2' sind beidseitig von einem pneumatischen Druckmittel beaufschlagbar, das über ein Steuerventil 3 und über die Leitung 4 dem zwischen den beiden Arbeitskolben 2 und 2' befindlichen Raum 6 zugeführt wird oder aber über die Leitungen 5 und 5' den beiden äußeren Räumen 7 und 7' zugeführt wird. Je nach Stellung des Steuerventils 3 werden die beiden Arbeitskolben 2 oder 2' vom Druckmittel auseinandergetrieben oder - wie die Fig. 1 Zeigt - gegeneinandergedrückt. Dabei wird die Welle 21 um 90° oder um 180° nach rechts oder nach links geschwenkt.The two working pistons 2 and 2 'can be acted upon on both sides by a pneumatic pressure medium which is supplied via a control valve 3 and via line 4 to the space 6 located between the two working pistons 2 and 2' or via lines 5 and 5 'to the two external spaces 7 and 7 'is supplied. Depending on the position of the control valve 3, the two working pistons 2 or 2 'are pushed apart by the pressure medium or - as shown in FIG. 1 - pressed against each other. The shaft 21 is pivoted 90 ° or 180 ° to the right or to the left.

Die Böden der Gehäuse 11 und 11' der Rückstelleinheiten 8 und 8' bilden die Zylinderdeckel des Arbeitszylinders 1. Jede Rückstelleinheit 8 bzw. 8' weist eine bewegliche Wand 10 bzw. 10' auf, welche das Gehäuse 11 bzw. 11' der Rückstelleinheit 8 bzw. 8' in einen Druckmittelraum 12 bzw. 12' und einen Federraum 14 bzw. 14' unterteilt. Im Federraum 14 bzw. 14' sind Rückstellfedern 15 angeordnet, welche die bewegliche Wand 10 bzw. 10' in Richtung auf den Arbeitskolben 2 bzw. 2' bewegen sollen. Die beiden Druckmittelräume 12 und 12' der Rückstelleinheiten 8 bzw. 8' sind über eine Verbindungsleitung 18 miteinander verbunden. Der Druckmittelraum 12 ist an einer Druckmittelquelle 13 angeschlossen. Das von dieser Druckmittelquelle kommende Druckmittel drückt die beweglichen Wände 10 und 10' der Rückstelleinheiten 8 und 8' nach außen, so daß die Rückstellfedern 15 vorgespannt sind. Die Druckmittelräume 12 und 12' der beiden Rückstelleinheiten 8 und 8' sind zwischen der Druckmittelquelle 13 und dem Steuerventil 3 angeordnet. Das bedeutet, daß das von der Druckmittelquelle 13 herkommende Druckmittel zuerst über die Druckmittelräume 12 und 12' der beiden Rückstelleinheiten 8 und 8' geführt wird, bevor es vom Ventil 3 dem Raum 6 oder den beiden äußeren Räumen 7 und 7' des Arbeitszylinders 1 zugeführt wird. Bei den dargestellten Schwenkantrieben ist das Steuerventil 3 über eine Zuführleitung 17 am Druckmittelraum 12' der zweiten Rückstelleinheit 8' angeschlossen, die ihrerseits über die Verbindungsleitung 18 mit dem an der Druckmittelquelle 13 angeschlossenen Druckmittelraum 12 der ersten Rückstelleinheit 8 in Verbindung steht. Das Steuerventil ist ein 5/2-Wegeventil das bei Stromausfall in die Sicherheitsstellung schaltet.The bottoms of the housings 11 and 11 'of the resetting units 8 and 8' form the cylinder covers of the working cylinder 1. Each resetting unit 8 or 8 'has a movable wall 10 or 10' which encloses the housing 11 or 11 'of the resetting unit 8 or 8 'divided into a pressure medium chamber 12 or 12' and a spring chamber 14 or 14 '. Return springs 15 are arranged in the spring chamber 14 or 14 ', which are intended to move the movable wall 10 or 10' in the direction of the working piston 2 or 2 '. The two pressure medium spaces 12 and 12 'of the resetting units 8 and 8' are connected to one another via a connecting line 18. The pressure medium chamber 12 is connected to a pressure medium source 13. The pressure medium coming from this pressure medium source presses the movable walls 10 and 10 'of the return units 8 and 8' outwards, so that the return springs 15 are pretensioned. The pressure medium spaces 12 and 12 'of the two reset units 8 and 8' are arranged between the pressure medium source 13 and the control valve 3. This means that the pressure medium coming from the pressure medium source 13 is first passed through the pressure medium spaces 12 and 12 'of the two resetting units 8 and 8' before being fed from the valve 3 to the space 6 or the two outer spaces 7 and 7 'of the working cylinder 1 becomes. In the rotary actuators shown, the control valve 3 is connected via a feed line 17 to the pressure medium chamber 12 'of the second reset unit 8', which in turn is connected via the connecting line 18 to the pressure medium chamber 12 of the first reset unit 8 connected to the pressure medium source 13. The control valve is a 5/2-way valve that switches to the safety position in the event of a power failure.

Wie die Fig. 2 zeigt, kann das Steuerventil 3 unmittelbar am Arbeitszylinder 1 angeflanscht werden. Die Verbindungsleitung 18 sowie die vom Steuerventil zum Zylinderraum 6 führende Leitung 4 sowie die vom Steuerventil 3 zu den beiden äußeren Räumen 7 und 7' des Arbeitszylinders 1 führende Leitungen 5 und 5' sowie die vom Druckmittelraum 12' zum Steuerventil 3 führende Zuführleitung 17 können als Kanäle in die Wandung des Arbeitszylinders 1 eingearbeitet sein.As FIG. 2 shows, the control valve 3 can be flange-mounted directly on the working cylinder 1. The connecting line 18 and the line 4 leading from the control valve to the cylinder space 6 and the lines 5 and 5 'leading from the control valve 3 to the two outer spaces 7 and 7' of the working cylinder 1 and the supply line 17 leading from the pressure medium space 12 'to the control valve 3 can be used as Channels are incorporated into the wall of the working cylinder 1.

Wie die Fig. 3 zeigt, kann die bewegliche Wand 10 der Rückstelleinheit 8 als flacher Kolben ausgebildet sein, der über einen gummielastischen Dichtring 19 gegen die Zylinderwand des Gehäuses 11 der Rückstelleinheit 8 abgedichtet ist Die bewegliche Wand 10' der Rückstelleinheit 8' wird von einem Federteller 22 gebildet, der über eine Rollmembran 23 gegenüber dem Gehäuse 11' der Rückstelleinheit 8' abgedichtet ist. Die Rollmembran 23 ist an ihrem Umfang zwischen Flansche 24 des Gehäuses 11' der Rückstelleinheit 8' eingespannt.As shown in FIG. 3, the movable wall 10 of the reset unit 8 can be designed as a flat piston which is sealed against the cylinder wall of the housing 11 of the reset unit 8 by a rubber-elastic sealing ring 19. The movable wall 10 'of the reset unit 8' is made by one Spring plate 22 is formed, which is sealed against the housing 11 'of the reset unit 8' via a rolling membrane 23. The rolling membrane 23 is clamped on its circumference between flanges 24 of the housing 11 'of the reset unit 8'.

Bei der Ausführungsform nach Fig. 3 ist die Rückstellstange 9 fest mit dem Kolben 10 der Rückstelleinheit 8 verbunden, während bei der Ausführungsform nach Fig. 2 die Rückstellstangen 9 und 9' fest mit den Arbeitskolben 2 und 2' verbunden sind.In the embodiment according to FIG. 3, the reset rod 9 is firmly connected to the piston 10 of the reset unit 8, while in the embodiment according to FIG. 2 the reset rods 9 and 9 'are firmly connected to the working pistons 2 and 2'.

BezugszeichenlisteReference symbol list

  • 1 Arbeitszylinder1 working cylinder
  • 2 Arbeitskolben2 working pistons
  • 2' Arbeitskolben2 'working piston
  • 3 Steuerventil3 control valve
  • 4 Leitung4 line
  • 5 Leitung5 line
  • 6 Zylinderraum an einer Seite des Arbeitskolbens 26 cylinder space on one side of the working piston 2
  • 7 Zylinderraum an der anderen Seite des Arbeitskolbens 27 cylinder space on the other side of the working piston 2
  • 7' Zylinderraum an der anderen Seite des Arbeitskolbens 2'7 'cylinder space on the other side of the working piston 2'
  • 8 Rückstelleinheit8 reset unit
  • 8' Rückstelleinheit8 'reset unit
  • 9 Rückstellstange9 reset rod
  • 9' Rückstellstange9 'reset rod
  • 10 bewegliche Wand10 movable wall
  • 10' bewegliche Wand10 'movable wall
  • 11 Gehäuse11 housing
  • 11' Gehäuse11 'housing
  • 12 Druckmittelraum12 pressure medium room
  • 12' Druckmittelraum12 'pressure medium space
  • 13 Druckmittelquelle13 pressure medium source
  • 14 Federraum14 spring chamber
  • 14' Federraum14 'spring chamber
  • 15 Rückstellfeder15 return spring
  • 15' Rückstellfeder15 'return spring
  • 16 Druckmittelleitung16 pressure medium line
  • 17 Zuführleitung17 supply line
  • 18 Verbindungsleitung18 connecting line
  • 20 Zahnstange20 rack
  • 20' Zahnstange20 'rack
  • 21 Welle21 wave
  • 22 Federteller22 spring washers
  • 23 Rollmembran23 rolling membrane

Claims (5)

1. Pivot drive comprising a working cylinder (1) in which a working piston (2) is guided which is adapted to be acted upon on both sides by a pneumatic or hydraulic pressure medium which is supplied via a control valve (3) and conduits (4, 5) to one of the two chambers (6, 7) on both sides of the working piston (2) and a reset unit (8) which comprises a movable wall (10) which via a reset rod (9) acts from the outside on the working piston (2) and which divides the housing (11) of the reset unit (8) into a pressure medium chamber (12) facing the working cylinder (1) and connected to a pressure medium source (13) and a spring chamber (14) remote from the working cylinder (1) and which is movable by at least one reset spring (15) against the working piston (2) and is movable against the action of the reset spring (15) by the pressure medium in the pressure medium chamber (12) away from the working piston (2), characterized in that the supply conduit (17) of the control valve (3) is connected only to the pressure medium chamber (12) of the reset unit (8) and the pressure medium is conducted from the pressure medium source via the pressure medium chamber (12) of the reset unit (8) to the control valve (3).
2. Pivot drive comprising a working cylinder (1) in which two oppositely running working pistons (2, 2') are guided which are adapted to be acted upon on both sides by a pneumatic pressure medium which is supplied via a control valve (3) and conduits (4, 5) either to the space (6) between the working pistons (2, 2') or to the two spaces (7, 7') at the end regions of the working cylinder (1), and a reset unit (8) which comprises a movable wall (10) which acts via a reset rod (9) from outside on a working piston (2) and which divides the housing (11) of the reset unit (8) into a pressure medium chamber (12) facing the working cylinder (1) and connected to a pressure medium source (13) and a spring chamber (14) remote from the working cylinder (1) and which is movable by at least one reset spring (15) against the working piston (2) and is movable against the action of the reset spring (15) by the pressure medium in the pressure medium chamber (12) away from the working piston (2), characterized in that at both ends of the working cylinder (1) a reset unit (8, 8') acting on a working piston (2, 2') is arranged and the supply conduit (17) of the control valve (3) is connected only to the pressure medium chamber (12') of one reset unit (8') which is connected via a connecting conduit (18) to the pressure medium chamber (12) of the other reset unit (8) which in turn is connected to the pressure medium source (13) so that the pressure medium is conducted from the pressure medium chambers (12, 12') to the control valve (3).
3. Pivot drive according to claim 2, characterized in that the connecting conduit (18) is formed by a passage disposed in the wall of the working cylinder (1).
4. Pivot drive according to claim 3, characterized in that the control valve (3) is secured to the working cylinder (1) and the conduit (4) from the control valve (3) to the centre cylinder space (6), the conduits (5, 5') from the control valve (3) to the two outer cylinder spaces (7, 7') and the supply conduit (17) from the pressure medium chamber (12') of the second reset unit (8') to the control valve (3) are formed by passages in the wall of the working cylinder (1).
5. Pivot drive according to any one of claims 1 to 4, characterized in that the movable wall (10, 101 is formed by a piston which is sealed by at least one elastomeric sealing ring (19) with respect to a cylindrical housing of the reset unit (8, 8').
EP87101597A 1986-02-26 1987-02-06 Oscillating servomotor Expired - Lifetime EP0236748B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87101597T ATE49266T1 (en) 1986-02-26 1987-02-06 PIVOT DRIVE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3606102 1986-02-26
DE19863606102 DE3606102A1 (en) 1986-02-26 1986-02-26 SWIVEL DRIVE

Publications (2)

Publication Number Publication Date
EP0236748A1 EP0236748A1 (en) 1987-09-16
EP0236748B1 true EP0236748B1 (en) 1990-01-03

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP87101597A Expired - Lifetime EP0236748B1 (en) 1986-02-26 1987-02-06 Oscillating servomotor

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EP (1) EP0236748B1 (en)
AT (1) ATE49266T1 (en)
DE (2) DE3606102A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3826592A1 (en) * 1988-08-04 1990-02-08 Siemens Ag DEVICE FOR ACTUATING A QUICK-RELEASE VALVE
DE3925887A1 (en) * 1989-08-04 1991-02-07 Chemat Gmbh Double acting pneumatic drive unit - has at least one piston, with piston chamber, spring arrangement, pressure compartment and control
US9810245B2 (en) 2013-03-15 2017-11-07 Habonim Industrial Valves & Actuators Ltd. Spring return actuator
FR3011121A1 (en) 2013-09-26 2015-03-27 St Microelectronics Sa INTEGRATED CIRCUIT CHIP ASSEMBLY COMPRISING AN OVERVOLTAGE PROTECTION COMPONENT
WO2017060758A1 (en) * 2015-10-09 2017-04-13 Habonim Industrial Valves & Actuators Ltd Spring return double piston rod scotch yoke actuator

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2012765A1 (en) * 1970-03-18 1971-10-07 Serck Industries Ltd Actuator to be operated with liquid

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1430612A (en) * 1973-06-26 1976-03-31 Keystone Int Valve actuator
US4087074A (en) * 1976-11-26 1978-05-02 The Parker & Harper Mfg. Co., Inc. Spring return valve actuator
DE3019821A1 (en) * 1979-05-25 1981-01-29 Jean Gachot Operator for remote controlled valve - has housing forming cylinder, and plunger with PTFE guides, energising rack driving output shaft pinion
DE8033371U1 (en) * 1980-12-16 1985-05-30 Norbro Antriebstechnik GmbH, 4050 Mönchengladbach Rotary actuator
DE3047283A1 (en) * 1980-12-16 1982-07-15 Norbro Antriebstechnik GmbH, 4050 Mönchengladbach Two-piston rotary actuating mechanism - has outer cylinder chambers connected to common pipe with pressure-relief valve
NL8104773A (en) * 1981-10-21 1982-08-02 Humabo B V CYLINDER PISTON DEVICE PROVIDED FOR RESET.
DE3402263A1 (en) * 1984-01-24 1985-08-01 Basf Ag, 6700 Ludwigshafen DEVICE FOR DRIVING CONTROL AND CONTROL TECHNICAL DEVICES

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2012765A1 (en) * 1970-03-18 1971-10-07 Serck Industries Ltd Actuator to be operated with liquid

Also Published As

Publication number Publication date
ATE49266T1 (en) 1990-01-15
DE3606102A1 (en) 1987-08-27
EP0236748A1 (en) 1987-09-16
DE3761323D1 (en) 1990-02-08

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