EP0377898A1 - 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
EP0377898A1
EP0377898A1 EP89124047A EP89124047A EP0377898A1 EP 0377898 A1 EP0377898 A1 EP 0377898A1 EP 89124047 A EP89124047 A EP 89124047A EP 89124047 A EP89124047 A EP 89124047A EP 0377898 A1 EP0377898 A1 EP 0377898A1
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EP
European Patent Office
Prior art keywords
cylinder
valve
clamping
piston rod
pressure
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.)
Granted
Application number
EP89124047A
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German (de)
French (fr)
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EP0377898B1 (en
Inventor
Günter Bartmann
Gerd BRÄCKELMANN
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Montanhydraulik GmbH
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Montanhydraulik GmbH
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Publication date
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Priority to AT89124047T priority Critical patent/ATE66052T1/en
Publication of EP0377898A1 publication Critical patent/EP0377898A1/en
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Publication of EP0377898B1 publication Critical patent/EP0377898B1/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
    • F15B15/20—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 method of rolling 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 that extends along 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 object of the invention is to design such a cylinder 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 releasing 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 piston rod clamping device is at least largely loosened when a driving process is initiated by 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 manner known per se from a clamping piece 171, a clamping cone 172 and a pressure spring 173 which are accommodated in the chamber 17, 17 'formed in the cylinder head 112, the leading on the piston rod 121 being overlapped by the clamping cone 172 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
  • 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-GM 85 05 101.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 relating to DE-GM 85 05 101.

Nach dem Stand der Technik wird das Lösen der Klemm­vorrichtung, das Voraussetzung für das Verfahren des Rolbens 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 method of rolling 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 that extends along 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.Starting from the previously outlined state of the art, the object of the invention is to design such a cylinder 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 releasing 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 piston rod clamping device is at least largely loosened when a driving process is initiated by 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 Druckf eder 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 process 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 pressure spring acting on the clamping cone, goes back into the clamping position without further ado.

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 an 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 manner known per se from a clamping piece 171, a clamping cone 172 and a pressure spring 173 which are accommodated in the chamber 17, 17 'formed in the cylinder head 112, the leading on the piston rod 121 being overlapped by the clamping cone 172 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 einwirkendenThe 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

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.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 caused by the extension in the differential circuit on the cylinder pressure space side and the annulus side, or it is the retracting effect causing 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. Einstufiger in Differentialschaltung betreibbarer Zylinder (11) mit einem aufsteuerbaren Ventil (19) in der Ausfahrdruckmittelleitung (13) und mit einer Kolbenstangen-Klemmvorrichtung, bestehend aus einer vor Kopf (112) des Zylinders (11) angeordneten, die Kolbenstange (121) umgebenden Kammer (17, 17′), in der sich ein unter der Einwirkung einer Druckfeder (173) in Richtung auf den Zylinder (11) anstellbarer Klemmkonus (172) führt, der im gegen den Zylinder (11) angestellten Zustand ein von ihm übergriffenes, die Kolbenstange (121) umgebendes, sich zur vom Zylinder (11) abgekehrten Seite hin verjüngendes kegelstumpfförmiges in axialer Richtung lagefixier­tes Klemmstück (171) klemmend gegen die Kolben­stange (121) zur Anlage bringt, wobei der Klemmkonus (172) und damit das Klemmstück (171) durch Druckmit­telbeaufschlagung auf der von der Druckfeder (173) abgekehrten Seite gegen den Druck dieser Feder (173) lösbar sind, dadurch gekennzeichnet, daß die die Bestandteile (171, 172, 173) der Klemmvorrichtung aufnehmende Kammer (17, 17′) zylinderseitig (17) ständig mit dem Ringraum (114) des Zylinders (11) verbunden ist und das in die Ausfahrdruckmittellei­tung (13) eingefügte Ventil (19) ein Vorspannventil mit Lastdruckausgleich für beide Durchflußrichtungen und mit einer zumindest weitgehend die Kraft der auf den Klemmkonus (172) einwirkenden Druckfeder (173) kompensierenden Vorspannung ist.1. Single-stage cylinder (11) which can be operated in differential circuit with a controllable valve (19) in the outlet pressure medium line (13) and with a piston rod clamping device, consisting of a piston rod (121) arranged in front of the head (112) of the cylinder (11). surrounding chamber (17, 17 '), in which a clamping cone (172) which can be adjusted under the action of a compression spring (173) in the direction of the cylinder (11) leads to a position which it engages against in the state against the cylinder (11) , the piston rod (121) surrounding, tapering towards the side facing away from the cylinder (11) in the axial direction fixed in position axially fixed clamping piece (171) against the piston rod (121), whereby the clamping cone (172) and thus the clamping piece ( 171) can be released against the pressure of this spring (173) by the application of pressure medium on the side facing away from the pressure spring (173), characterized in that the components (171, 172 , 173) of the clamping device receiving chamber (17, 17 ') on the cylinder side (17) is continuously connected to the annular space (114) of the cylinder (11) and the valve (19) inserted into the extension pressure medium line (13) is a preload valve with load pressure compensation for both Flow directions and with a prestress which at least largely compensates for the force of the compression spring (173) acting on the clamping cone (172). 2. Zylinder nach Anspruch 1, dadurch gekennzeichnet, daß das in die Ausfahrdruckmittelleitung eingefügte Ventil (19) ein Vorspann-Bremsventil ist.2. Cylinder according to claim 1, characterized in that the valve (19) inserted into the outlet pressure medium line is a biasing brake valve. 3. Zylinder nach Anspruch 1 oder Anspruch 2, gekenn­zeichnet durch ein Vorspannventil (19) mit einstell­barer Vorspannung.3. Cylinder according to claim 1 or claim 2, characterized by a bias valve (19) with adjustable bias. 4. Zylinder nach einem der Ansprüche 1 bis 3, gekenn­zeichnet durch ein dem Vorspannventil (19) zuge­ordnetes, vorweg aufsteuerbares Druckausgleichs­ventil (198).4. Cylinder according to one of claims 1 to 3, characterized by a preload controllable pressure compensation valve (198) assigned to the preload valve (19).
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
DE3900344A DE3900344A1 (en) 1989-01-07 1989-01-07 SINGLE STAGE CYLINDER WITH PISTON ROD CLAMPING DEVICE
DE3900344 1989-01-07

Publications (2)

Publication Number Publication Date
EP0377898A1 true EP0377898A1 (en) 1990-07-18
EP0377898B1 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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EP0589863A1 (en) * 1992-09-15 1994-03-30 Hoerbiger Ventilwerke Aktiengesellschaft Hydraulic cylinder
DE4421861C2 (en) * 1993-10-07 1999-07-01 Hoerbiger Gmbh Hydraulic cylinder
DE102005001234A1 (en) * 2005-01-11 2006-07-20 Wabco Gmbh & Co.Ohg Brake cylinder with parking brake function
EP2345815A1 (en) * 2010-01-14 2011-07-20 Bosch Rexroth Oil Control S.p.A. A hydraulic valve for supporting and controlling descent of a load

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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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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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
EP0097739A1 (en) * 1982-06-30 1984-01-11 Hydro-Gerätebau GmbH & Co. KG Hebezeuge Hydraulic support arrangements

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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
EP0097739A1 (en) * 1982-06-30 1984-01-11 Hydro-Gerätebau GmbH & Co. KG Hebezeuge Hydraulic support arrangements

Cited By (5)

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Publication number Priority date Publication date Assignee Title
EP0589863A1 (en) * 1992-09-15 1994-03-30 Hoerbiger Ventilwerke Aktiengesellschaft Hydraulic cylinder
DE4421861C2 (en) * 1993-10-07 1999-07-01 Hoerbiger Gmbh Hydraulic cylinder
DE102005001234A1 (en) * 2005-01-11 2006-07-20 Wabco Gmbh & Co.Ohg Brake cylinder with parking brake function
US8944527B2 (en) 2005-01-11 2015-02-03 Wabco Gmbh Brake cylinder with parking brake function
EP2345815A1 (en) * 2010-01-14 2011-07-20 Bosch Rexroth Oil Control S.p.A. A hydraulic valve for supporting and controlling descent of a load

Also Published As

Publication number Publication date
ATE66052T1 (en) 1991-08-15
DE3900344A1 (en) 1990-07-12
EP0377898B1 (en) 1991-08-07
DE58900207D1 (en) 1991-09-12

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