EP0377898B1 - Single-stage actuator with a piston rod locking device - Google Patents

Single-stage actuator with a piston rod locking device Download PDF

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Publication number
EP0377898B1
EP0377898B1 EP89124047A EP89124047A EP0377898B1 EP 0377898 B1 EP0377898 B1 EP 0377898B1 EP 89124047 A EP89124047 A EP 89124047A EP 89124047 A EP89124047 A EP 89124047A EP 0377898 B1 EP0377898 B1 EP 0377898B1
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EP
European Patent Office
Prior art keywords
cylinder
pressure
valve
clamping
piston rod
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.)
Expired - Lifetime
Application number
EP89124047A
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German (de)
French (fr)
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EP0377898A1 (en
Inventor
Günter Bartmann
Gerd BRÄCKELMANN
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.)
Montanhydraulik GmbH
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Montanhydraulik GmbH
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Publication date
Application filed by Montanhydraulik GmbH filed Critical Montanhydraulik GmbH
Priority to AT89124047T priority Critical patent/ATE66052T1/en
Publication of EP0377898A1 publication Critical patent/EP0377898A1/en
Application granted granted Critical
Publication of EP0377898B1 publication Critical patent/EP0377898B1/en
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Expired - Lifetime 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
    • F15B15/26—Locking mechanisms
    • F15B15/262—Locking mechanisms using friction, e.g. brake pads
    • 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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/01—Locking-valves or other detent i.e. load-holding devices
    • F15B13/015—Locking-valves or other detent i.e. load-holding devices using an enclosed pilot flow valve
    • 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
    • F15B15/202—Externally-operated valves mounted in or on the actuator

Definitions

  • the invention relates to a single-stage cylinder operable in differential circuit with a piston rod clamping device of the type outlined in the preamble of claim 1.
  • a piston rod clamping device of the type outlined in the preamble of claim 1.
  • the loosening of the clamping device which is a prerequisite for the movement of the piston in the cylinder and the associated extension or retraction of the piston rod, is achieved by feeding pressure medium into an independent pressure space that is shielded from the annular space of the cylinder causes the clamping cone, under the action of which the clamping cone is displaced out of the clamping position against the pressure of the compression spring which converts and holds it in the clamping position while removing the clamping.
  • This requires an independent pressure medium supply line, which extends on the circumference of the cylinder into the area of the clamping device at the head of the cylinder, and then also an independent control element for this.
  • the invention is based on the object of designing such a cylinder which is provided with a piston rod clamping device in a structurally simpler manner, in which case there is also a seamless transition from the system between loosening the clamping device and moving the piston rod or the piston results.
  • the object is achieved according to the invention in a generic cylinder in such a way that the chamber receiving the components of the clamping device is connected on the cylinder side to the annular space of the cylinder and As a valve to be inserted into the extension pressure medium line, a preload valve with load pressure compensation for both flow directions and with a preload which at least largely compensates for the force of the compression spring acting on the clamping cone is provided.
  • the at least extensive loosening of the piston rod clamping device takes place during the initiation of a driving process due to the pressure medium pressure building up in the annular space of the cylinder, which continues into this chamber through the connection to the components of the clamping device and the loosening of the clamping cone and so that the clamping piece then also acts against the pressure of the adjusting spring acting on the clamping cone before the pressure medium pressure applied to the working piston of the cylinder comes into play in the sense of the piston movement.
  • the valve securing the extension pressure medium line can then also be a preload brake valve.
  • the closing body of the valve is provided with control grooves.
  • the preload valve securing the extension pressure medium line is expediently adjustable.
  • a preload controllable pressure compensation valve is assigned to the preload valve.
  • the single-stage cylinder consists of the actual cylinder 11, in which the piston 12 can be displaced in the direction of the double arrow A.
  • the piston rod 121 extends from the piston 12 and protrudes from the cylinder 11 through the cylinder head 112 on the side facing away from the cylinder base 111.
  • Piston 12 and piston rod 121 form the so-called cylinder pressure chamber 113 in the cylinder 11 on the one hand and the so-called annular chamber 114 on the other hand.
  • the outlet pressure medium line 13 is connected to the cylinder pressure chamber 113, on the bottom side, and the inlet pressure medium line 14 is connected to the annular space 114 directly below the cylinder head 112.
  • Circuit diagram I) and switchable for extending or retracting in a corresponding manner circuit diagrams II and III).
  • the piston rod clamping device is integrated in the cylinder head 112. It consists in a known manner of a clamping piece 171, a clamping cone 172 and a pressure spring 173, which are housed in the chamber 17, 17 'formed in the cylinder head 112, the leading on the piston rod 121, overlapped by the clamping cone 172 in Axial direction fixed clamping piece 171 comes under the action of the compression spring 173 in the direction of arrow B clamping cone 172 by the clamping cone 172 clamping against the piston rod 121 to the system.
  • the portion 17 of the chamber 17, 17 ' is directly connected to the annular space 114 of the cylinder 11, from the portion 17' is a ventilation line 174.
  • the preload valve therefore only opens when the pressure medium pressure applied to the control piston 21 via the cable 14, 141 outweighs the set spring force (the preload).
  • the spring force is set so that the pressure medium pressure which is present at the same time on the connecting cone 172 and the clamping piece 171 of the clamping device via the connecting line 18 first presses the clamping cone 172 against the pressure of those acting on it Spring 173 in the direction of arrow B 'raises, which is accompanied by the release of the clamping piece 171 before the biasing valve 19 opens.
  • the pressure medium pressure only comes into play when a driving process is initiated on the piston 12 of the cylinder when the clamping device is released, whether it is the extension causing the differential pressure to be present on the cylinder pressure space side and the annulus side, or the retraction causing the retraction on the annulus side.
  • the plunger 211 of the control piston 21 acts directly on the component 191 of the closing body 191 of the preload valve 19, the closing body 191 and the valve 194 being in pressure compensation via the bore 196 with reference to the pressure medium pressure in the cylinder pressure chamber 113.
  • a compensating valve is provided, the closing body 198 of which is removed from its closed position from the offset end 212 of the plunger 211 emanating from the control piston 21 when the control piston 21 is pressurized with pressure medium to bring about pressure compensation at the preload valve.
  • a ventilation line on the control piston 21 is designated.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Jigs For Machine Tools (AREA)
  • Actuator (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Gripping Jigs, Holding Jigs, And Positioning Jigs (AREA)

Abstract

A power cylinder has a body (11) which houses a piston (12) which has a piston rod (121). The piston can be held in any required position by a clamping device installed in the cylinder head (112). The clamping device consists of a chamber (17) which houses a clamping cone (172). This clamping cone is pressed downwards by a stack of disc springs (17') onto a clamping bush (171) which grips the piston rod (121). The clamp is released by admitting the pressure medium to the chamber (17) so that the force of the disc springs is overcome and the clamping cone (172) is pushed upwards clear of the clamping bush (171).

Description

Die Erfindung betrifft einen einstufigen in Differentialschaltung betreibbaren Zylinder mit einer Kolbenstangen-Klemmvorrichtung der im Oberbegriff des Anspruches 1 umrissenen Gattung. Ein solcher Zylinder ist im Prinzip beschrieben in den Unterlagen zu dem DE-U-8505101.The invention relates to a single-stage cylinder operable in differential circuit with a piston rod clamping device of the type outlined in the preamble of claim 1. Such a cylinder is described in principle in the documents for DE-U-8505101.

Nach dem Stand der Technik wird das Lösen der Klemmvorrichtung, das Voraussetzung für das Verfahren des Kolbens im Zylinder und damit einhergehendem Aus- bzw. Einfahren der Kolbenstange ist, durch Einspeisung von Druckmittel in einen eigenständigen, gegenüber dem Ringraum des Zylinders abgeschirmten Druckraum unterhalb des Klemmkonus bewirkt, unter dessen Einwirkung der Klemmkonus gegen den Druck der ihn in Klemmlage überführenden und haltenden Druckfeder unter Aufhebung der Klemmung aus der Klemmlage heraus verlagert wird. Dazu ist eine eigenständige, sich am Umfang des Zylinders bis in den Bereich der Klemmvorrichtung am Kopf des Zylinders erstreckenden Druckmittelzuleitung erforderlich und dann auch ein eigenständiges Steuerorgan hierfür. Sicherzustellen ist hierbei auch, daß das Lösen der Klemmvorrichtung und der anschließende Fahrvorgang ineinander übergehen, wenn man eine unkontrollierte Verlagerung der Kolbenstange bzw. des Kolbens vermeiden will. Kommt es vor Einleitung des Fahrvorganges nicht zum zumindest weitgehenden Lösen der Klemmvorrichtung, setzt der Fahrvorgang in unerwünschter Weise ruckartig ein.According to the prior art, the loosening of the clamping device, which is a prerequisite for the movement of the piston in the cylinder and the associated extension or retraction of the piston rod, is achieved by feeding pressure medium into an independent pressure space that is shielded from the annular space of the cylinder causes the clamping cone, under the action of which the clamping cone is displaced out of the clamping position against the pressure of the compression spring which converts and holds it in the clamping position while removing the clamping. This requires an independent pressure medium supply line, which extends on the circumference of the cylinder into the area of the clamping device at the head of the cylinder, and then also an independent control element for this. It must also be ensured here that the loosening of the clamping device and the subsequent driving process merge into one another if one wishes to avoid an uncontrolled displacement of the piston rod or the piston. If the clamping device is not at least largely loosened before the driving process is initiated, the driving process starts jerkily in an undesirable manner.

Ausgehend vom im vorausgehenden umrissen Stand der Technik liegt der Erfindung die Aufgabe zugrunde, einen solchen mit einer Kolbenstangen-Klemmvorrichtung versehenen Zylinder konstruktiv einfacher auszulegen, bei dem sich dann auch aus dem System heraus ein nahtloser Übergang zwischen dem Lösen der Klemmvorrichtung und dem Verfahren der Kolbenstange bzw. des Kolbens ergibt.On the basis of the prior art outlined above, the invention is based on the object of designing such a cylinder which is provided with a piston rod clamping device in a structurally simpler manner, in which case there is also a seamless transition from the system between loosening the clamping device and moving the piston rod or the piston results.

Die Aufgabe wird bei einem gattungsgemäßen Zylinder erfindungsgemäß in der Weise gelöst, daß die die Bestandteile der Klemmvorrichtung aufnehmende Kammer zylinderseitig mit dem Ringraum des Zylinders verbunden wird und als in die Ausfahrdruckmittelleitung einzufügendes Ventil ein Vorspannventil mit Lastdruckausgleich für beide Durchflußrichtungen und mit einer zumindest weitgehend die Kraft der auf den Klemmkonus einwirkenden Druckfeder kompensierenden Vorspannung ist, vorgesehen wird.The object is achieved according to the invention in a generic cylinder in such a way that the chamber receiving the components of the clamping device is connected on the cylinder side to the annular space of the cylinder and As a valve to be inserted into the extension pressure medium line, a preload valve with load pressure compensation for both flow directions and with a preload which at least largely compensates for the force of the compression spring acting on the clamping cone is provided.

Bei der erfindungsgemäßen Lösung erfolgt das zumindest weitgehende Lösen der Kolbenstangen-Klemmvorrichtung bei der Einleitung eines Fahrvorganges durch den sich dabei im Ringraum des Zylinders aufbauenden Druckmitteldruck der sich durch die Verbindung zur die Bestandteile der Klemmvorrichtung aufnehmenden Kammer in diese Kammer fortsetzt und das Lösen des Klemmkonus und damit dann auch das Klemmstück gegen den Druck der auf den Klemmkonus einwirkenden Anstellfeder bewirkt bevor der am Arbeitskolben des Zylinders anstehende Druckmitteldruck im Sinne des Verfahrens des Kolbens zum Tragen kommt.In the solution according to the invention, the at least extensive loosening of the piston rod clamping device takes place during the initiation of a driving process due to the pressure medium pressure building up in the annular space of the cylinder, which continues into this chamber through the connection to the components of the clamping device and the loosening of the clamping cone and so that the clamping piece then also acts against the pressure of the adjusting spring acting on the clamping cone before the pressure medium pressure applied to the working piston of the cylinder comes into play in the sense of the piston movement.

Erst dann kommt es bei zunehmendem, die Vorspannung am die Ausfahrdruckmittelleitung absichernden Ventil überwindenden Druckmitteldruck zum Öffnen dieses Ventils und der Arbeitskolben mit der Kolbenstange verfährt von Anfang an in einwandfreier Weise. Bei Beendigung eines Fahrvorganges und damit einhergehendem Abfall des Druckmitteldrucks im Zylinder schließt zunächst das Vorspannventil, anschließend geht die Klemmvorrichtung unter der Einwirkung der auf den Klemmkonus einwirkenden Druckfeder ohne weiteres wieder in die Klemmlage über.Only then does this valve and the working piston with the piston rod move in a flawless manner from the beginning with increasing pressure pressure overcoming the preload on the valve securing the extension pressure line. At the end of a driving operation and the associated drop in the pressure medium pressure in the cylinder, the preload valve closes first, then the clamping device, under the action of the compression spring acting on the clamping cone, easily changes back into the clamping position.

Das die Ausfahrdruckmittelleitung absichernde Ventil kann dann auch ein Vorspann-Bremsventil sein. Hierbei ist der Schließkörper des Ventils mit Regelnuten versehen.The valve securing the extension pressure medium line can then also be a preload brake valve. The closing body of the valve is provided with control grooves.

Zweckmäßigerweise ist das die Ausfahrdruckmittelleitung absichernde Vorspannventil einstellbar. In Ausgestaltung ist dem Vorspannventil ein vorweg aufsteuerbares Druckausgleichsventil zugeordnet.The preload valve securing the extension pressure medium line is expediently adjustable. In one embodiment, a preload controllable pressure compensation valve is assigned to the preload valve.

In der Zeichnung ist die Erfindung anhand eines in schematischer Weise dargestellten Ausführungsbeispieles weitergehend erläutert.In the drawing, the invention is further explained using an exemplary embodiment shown in a schematic manner.

Der einstufige Zylinder besteht aus dem eigentlichen Zylinder 11, in dem der Kolben 12 im Sinne des Doppelpfeiles A verlagerbar ist. Von dem Kolben 12 geht die Kolbenstange 121 aus, die auf der vom Zylinderboden 111 abgekehrten Seite durch den Zylinderkopf 112 aus dem Zylinder 11 herausragt. Kolben 12 und Kolbenstange 121 bilden im Zylinder 11 einerseits den sogenannten Zylinderdruckraum 113 und andererseits den sogenannten Ringraum 114 aus. An den Zylinderdruckraum 113, und zwar bodenseitig, ist die Ausfahrdruckmittelleitung 13 angeschlossen, an den Ringraum 114 unmittelbar unterhalb des Zylinderkopfes 112 die Einfahrdruckmittelleitung 14. Die Druckmittelleitungen 13 und 14 sind über einen Steuerschieber 16 zur Herbeiführung des Haltezustandes von der Förderpumpe für das Druckmittel abwerfbar (Schaltbild I) sowie zum Aus- bzw. Einfahren in entsprechender Weise zuschaltbar (Schaltbilder II und III).The single-stage cylinder consists of the actual cylinder 11, in which the piston 12 can be displaced in the direction of the double arrow A. The piston rod 121 extends from the piston 12 and protrudes from the cylinder 11 through the cylinder head 112 on the side facing away from the cylinder base 111. Piston 12 and piston rod 121 form the so-called cylinder pressure chamber 113 in the cylinder 11 on the one hand and the so-called annular chamber 114 on the other hand. The outlet pressure medium line 13 is connected to the cylinder pressure chamber 113, on the bottom side, and the inlet pressure medium line 14 is connected to the annular space 114 directly below the cylinder head 112. Circuit diagram I) and switchable for extending or retracting in a corresponding manner (circuit diagrams II and III).

In den Zylinderkopf 112 ist die Kolbenstangen-Klemmvorrichtung integriert. Sie besteht in an sich bekannter Weise aus einem Klemmstück 171, einem Klemmkonus 172 und einer Andruckfeder 173, die in der im Zylinderkopf 112 ausgebildeten Kammer 17, 17′ untergebracht sind, wobei das sich auf der Kolbenstange 121 führende, von dem Klemmkonus 172 übergriffene in axialer Richtung lagefixierte Klemmstück 171 bei unter der Einwirkung der Druckfeder 173 im Sinne des Pfeiles B angestelltem Klemmkonus 172 durch den Klemmkonus 172 klemmend gegen die Kolbenstange 121 zur Anlage kommt. Der Teilbereich 17 der Kammer 17, 17′ ist unmittelbar mit dem Ringraum 114 des Zylinders 11 verbunden, von dem Teilbereich 17′ geht eine Be- und Entlüftungsleitung 174 aus.The piston rod clamping device is integrated in the cylinder head 112. It consists in a known manner of a clamping piece 171, a clamping cone 172 and a pressure spring 173, which are housed in the chamber 17, 17 'formed in the cylinder head 112, the leading on the piston rod 121, overlapped by the clamping cone 172 in Axial direction fixed clamping piece 171 comes under the action of the compression spring 173 in the direction of arrow B clamping cone 172 by the clamping cone 172 clamping against the piston rod 121 to the system. The portion 17 of the chamber 17, 17 'is directly connected to the annular space 114 of the cylinder 11, from the portion 17' is a ventilation line 174.

Der Schließkörper 191 des durch den Steuerkolben 21 über den davon ausgehenden Stößel 211 aufsteuerbaren, in die Ausfahrdruckmittelleitung 13 eingefügten Vorspannventils 19 wird durch die Feder 192 in Schließstellung gehalten, deren Federkraft über die Stellschraube 193 einstellbar ist. Zum Öffnen des Vorspannventils kommt es somit erst, wenn der über den Leitungszug 14, 141 am Steuerkolben 21 anstehende Druckmitteldruck, die eingestellte Federkraft (die Vorspannung) überwiegt. Die Federkraft ist so eingestellt, daß der über die Verbindungsleitung 18 gleichzeitig am Klemmkonus 172 und das Klemmstück 171 der Klemmvorrichtung anstehende Druckmitteldruck zunächst den Klemmkonus 172 gegen den Druck der auf ihn einwirkenden Feder 173 im Sinne des Pfeiles B′ anhebt, womit das Lösen das Klemmstück 171 einhergeht, bevor das Vorspannventil 19 öffnet. Auf diese Weise kommt der Druckmitteldruck bei Einleitung eines Fahrvorganges am Kolben 12 des Zylinders erst bei gelöster Klemmvorrichtung zum Tragen, sei es das Ausfahren bewirkend in Diffentialschaltung zylinderdruckraumseitig und ringraumseitig anstehend, sei es das Einfahren bewirkend ringraumseitig anstehend.The closing body 191 of the preload valve 19, which can be opened by the control piston 21 via the plunger 211 emanating therefrom and inserted into the extension pressure medium line 13, is held in the closed position by the spring 192, the spring force of which can be adjusted via the adjusting screw 193. The preload valve therefore only opens when the pressure medium pressure applied to the control piston 21 via the cable 14, 141 outweighs the set spring force (the preload). The spring force is set so that the pressure medium pressure which is present at the same time on the connecting cone 172 and the clamping piece 171 of the clamping device via the connecting line 18 first presses the clamping cone 172 against the pressure of those acting on it Spring 173 in the direction of arrow B 'raises, which is accompanied by the release of the clamping piece 171 before the biasing valve 19 opens. In this way, the pressure medium pressure only comes into play when a driving process is initiated on the piston 12 of the cylinder when the clamping device is released, whether it is the extension causing the differential pressure to be present on the cylinder pressure space side and the annulus side, or the retraction causing the retraction on the annulus side.

Im einfachsten Fall wirkt der Stößel 211 des Steuerkolbens 21 unmittelbar auf den Bestandteil des Schließkörpers 191 des Vorspannventils 19 bildenden Schieber 194 ein, wobei sich Schließkörper 191 und Schieber 194 über die Bohrung 196 mit Bezug auf den im Zylinderdruckraum 113 anstehenden Druckmitteldruck im Druckausgleich befinden.In the simplest case, the plunger 211 of the control piston 21 acts directly on the component 191 of the closing body 191 of the preload valve 19, the closing body 191 and the valve 194 being in pressure compensation via the bore 196 with reference to the pressure medium pressure in the cylinder pressure chamber 113.

Im dargestellten Fall ist zwecks Entlastung der Dichtung 197 am Schieber 194 ein Ausgleichventil vorgesehen, dessen Schließkörper 198 vom abgesetzten Ende 212 des vom Steuerkolben 21 ausgehenden Stößels 211 bei Beaufschlagung des Steuerkolbens 21 mit Druckmitteldruck zur Herbeiführung des Druckausgleichs am Vorspannventil vorweg aus seiner Schließlage entfernt wird. Mit 213 ist eine Be- und Entlüftungsleitung am Steuerkolben 21 bezeichnet.In the illustrated case, in order to relieve the seal 197 on the slide 194, a compensating valve is provided, the closing body 198 of which is removed from its closed position from the offset end 212 of the plunger 211 emanating from the control piston 21 when the control piston 21 is pressurized with pressure medium to bring about pressure compensation at the preload valve. With 213 a ventilation line on the control piston 21 is designated.

Claims (4)

1. Single-stage cylinder (11), which is operable in a differential arrangement and is provided with an openable valve (19) in the pressure-medium extension pipe (13) and with a piston rod clamping means, comprising a chamber (17, 17′), which is disposed in front of the head (112) of the cylinder (11) and surrounds the piston rod (121), a clamping cone (172) extending in said chamber and being adjustable by the action of a compression spring (173) in the direction of the cylinder (11), said cone causing a frustoconical clamping member (171) to abut clampingly against the piston rod (121) in the state orientated towards the cylinder (11), which clamping member is overlapped by the cylinder, surrounds the piston rod (121), tapers towards the side remote from the cylinder (11) and is fixed in position in the axial direction, the clamping cone (172) and, hence, the clamping member (171) being releasable by the action of pressure medium on the side remote from the compression spring (173) in opposition to the pressure of this spring (173), characterised in that the chamber (17, 17′), which accommodates the component parts (171, 172, 173) of the clamping means, is permanently connected at the cylinder end (17) to the annular chamber (114) of the cylinder (11), and the valve (19), which is inserted into the pressure-medium extension pipe (13), is a pressurising valve having a means for equalising the load pressure for both throughflow directions and having an initial tension, which at least largely compensates for the force of the compression spring (173) acting on the clamping cone (172).
2. Cylinder according to claim 1, characterised in that the valve (19), which is inserted into the pressure-medium extension pipe, is a pressurising brake valve.
3. Cylinder according to claim 1 or claim 2, characterised by a pressurising valve (19) having adjustable initial tension.
4. Cylinder according to one of claim 1 to 3, characterised by a pressure-equalising valve (198), which is associated with the pressurising valve (19) and is openable from the beginning.
EP89124047A 1989-01-07 1989-12-28 Single-stage actuator with a piston rod locking device Expired - Lifetime EP0377898B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89124047T ATE66052T1 (en) 1989-01-07 1989-12-28 SINGLE STAGE CYLINDER WITH ROD CLAMPING DEVICE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3900344 1989-01-07
DE3900344A DE3900344A1 (en) 1989-01-07 1989-01-07 SINGLE STAGE CYLINDER WITH PISTON ROD CLAMPING DEVICE

Publications (2)

Publication Number Publication Date
EP0377898A1 EP0377898A1 (en) 1990-07-18
EP0377898B1 true EP0377898B1 (en) 1991-08-07

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Application Number Title Priority Date Filing Date
EP89124047A Expired - Lifetime EP0377898B1 (en) 1989-01-07 1989-12-28 Single-stage actuator with a piston rod locking device

Country Status (3)

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EP (1) EP0377898B1 (en)
AT (1) ATE66052T1 (en)
DE (2) DE3900344A1 (en)

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DE4445960C1 (en) * 1994-12-22 1996-07-11 Grau Gmbh Brake cylinder for a compressed air-operated vehicle brake

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ATA183292A (en) * 1992-09-15 1996-06-15 Hoerbiger Ventilwerke Ag HYDRAULIC CYLINDER
AT404168B (en) * 1993-10-07 1998-09-25 Hoerbiger Gmbh HYDRAULIC CYLINDER
DE102005001234A1 (en) * 2005-01-11 2006-07-20 Wabco Gmbh & Co.Ohg Brake cylinder with parking brake function
EP2345815B1 (en) * 2010-01-14 2012-10-24 Bosch Rexroth Oil Control S.p.A. A hydraulic valve for supporting and controlling descent of a load
JP7211687B2 (en) * 2018-10-17 2023-01-24 キャタピラー エス エー アール エル Anti-descent valve gear, blade gear and working machines

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Publication number Priority date Publication date Assignee Title
DE8505101U1 (en) * 1985-02-22 1986-02-27 Montan-Hydraulik GmbH, 4755 Holzwickede Piston rod clamping device

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US3498182A (en) * 1968-05-07 1970-03-03 Sheffer Corp The Locking cylinder
FR2248229A1 (en) * 1973-10-17 1975-05-16 Samiia Hydraulic winch safety device - has adjustable spring-loaded throttle in fluid return passage used when lowering
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Publication number Priority date Publication date Assignee Title
DE8505101U1 (en) * 1985-02-22 1986-02-27 Montan-Hydraulik GmbH, 4755 Holzwickede Piston rod clamping device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4445960C1 (en) * 1994-12-22 1996-07-11 Grau Gmbh Brake cylinder for a compressed air-operated vehicle brake

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Publication number Publication date
EP0377898A1 (en) 1990-07-18
ATE66052T1 (en) 1991-08-15
DE58900207D1 (en) 1991-09-12
DE3900344A1 (en) 1990-07-12

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