EP0143238A1 - Three-position actuating cylinder - Google Patents

Three-position actuating cylinder Download PDF

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Publication number
EP0143238A1
EP0143238A1 EP84111140A EP84111140A EP0143238A1 EP 0143238 A1 EP0143238 A1 EP 0143238A1 EP 84111140 A EP84111140 A EP 84111140A EP 84111140 A EP84111140 A EP 84111140A EP 0143238 A1 EP0143238 A1 EP 0143238A1
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EP
European Patent Office
Prior art keywords
piston
pressure medium
medium chamber
pressure
space
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
EP84111140A
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German (de)
French (fr)
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EP0143238B1 (en
Inventor
K.-H. Brinkmann
Alfred Klatt
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Wabco Westinghouse Fahrzeugbremsen GmbH
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Wabco Westinghouse Fahrzeugbremsen GmbH
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Application filed by Wabco Westinghouse Fahrzeugbremsen GmbH filed Critical Wabco Westinghouse Fahrzeugbremsen GmbH
Priority to AT84111140T priority Critical patent/ATE28763T1/en
Publication of EP0143238A1 publication Critical patent/EP0143238A1/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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/006—Hydraulic "Wheatstone bridge" circuits, i.e. with four nodes, P-A-T-B, and on-off or proportional valves in each link
    • 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
    • F15B11/12—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor providing distinct intermediate positions; with step-by-step action
    • F15B11/121—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor providing distinct intermediate positions; with step-by-step action providing distinct intermediate positions
    • F15B11/123—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor providing distinct intermediate positions; with step-by-step action providing distinct intermediate positions by means of actuators with fluid-operated stops

Definitions

  • the invention relates to a working cylinder with three positions according to the preamble of claim 1.
  • Such a working cylinder is known from DE-AS 15 76 175.
  • a first piston provided with a piston rod, which divides the cylinder into a first pressure medium chamber on the piston rod side and a second pressure medium chamber arranged on the other side of the piston with respect to the first pressure medium chamber.
  • a second piston designed as an annular piston is arranged such that it can be moved and sealed. The second piston is against one gradation of the cylinder housing which fixes the middle position is movable.
  • Such a breathing hole has the disadvantage that moisture and dirt can penetrate into the cylinder. If you were to think of preventing the ingress of moisture and dirt by arranging a check valve which can be brought into the open position to the atmosphere in or at the outlet of the breathing bore, the disadvantage of vacuum formation would still remain.
  • the invention has for its object to provide a cylinder of the type mentioned, which allows ventilation of the space delimited by the two pistons with simple means without the aforementioned disadvantages have to be accepted.
  • the invention offers in particular the advantage of connecting the one delimited by the two pistons Room with the valve devices for venting the two pressure medium chambers of the cylinder to obtain a ventilation system for all chambers of the working cylinder, which prevents the cylinder chamber from becoming dirty and enables the use of this cylinder even in damp and dusty locations.
  • Another advantage of the invention is to be seen in the fact that with appropriate dimensioning of the outlet valve for the space delimited by the two pistons and appropriate design of the connecting lines and the piston active surfaces, the piston movement in the direction of the space not to be acted upon by the pressure medium from the pressure the room to be ventilated is supported.
  • the illustration shows a working cylinder with three positions on average.
  • a first piston 15, 16 provided with a piston rod 53 is displaceably arranged.
  • the first piston 15, 16 divides the cylinder into a first pressure medium chamber 3 on the piston rod side and a second pressure medium chamber 17 located on the other side of the piston 15, 16 with respect to the first pressure medium chamber 3.
  • the two pressure medium chambers 3 and 17 are each connected via a pressure medium connection 50 or 18 and a valve device to be explained in more detail below ventable.
  • the first piston 15, 16 has on its side facing the second pressure medium chamber 17 a spherical guide 15.
  • a groove ring 13 is supported in a groove 14, the flanks of which are formed on the one hand by the spherical guide 15 and on the other hand by a circumferential projection of the piston 15, 16 serving as a stop 12.
  • the groove ring 13 seals the second pressure medium chamber 17 against the first pressure medium chamber 3.
  • a second piston 8 designed as an annular piston is arranged so as to be displaceable relative to the first piston 15, 16.
  • the second piston 8 has a radially outwardly extending circumferential projection 7, with which the second piston 8 can be brought into contact with a stop 47 fixed to the housing during a movement in the direction of the second pressure medium chamber 17.
  • the stop 47 fixed to the housing is formed by a gradation of the cylinder 4 and serves to fix the two pistons 15, 16, 8 in the central position.
  • a groove ring 6 is supported in a groove 5 of the second piston 8, the flanks of which are formed on the one hand by the projection 7 and on the other hand by a further circumferential projection 54, which is provided on the side of the second piston 8 facing the first pressure medium chamber 3.
  • the groove ring 6 seals the first pressure medium chamber 3 against the second pressure medium chamber 17.
  • an additional sealing ring 48 is arranged between the outer surface of the first piston 15, 16 and the inner wall of the second piston 8.
  • the additional designed as a grooved ring
  • sealing ring 48 is mounted in a groove 49 provided in the lateral surface of the first piston 15, 16, which is provided in the end region of the first piston 15, 16 facing the first pressure medium chamber 3.
  • the second piston 8 has a preferably circumferential projection 9, 10, 11, which extends radially inwards in the direction of the lateral surface of the first piston 15, 16. The projection serves as a stop which, when the two pistons 15, 16, 8 move away from one another, can be brought into contact with the sealing ring 48 arranged between the two pistons 15, 16, 8 on the first piston 15, 16.
  • the stop 9, 10, 11 has a steep edge 9 on its side facing the sealing ring 48 and a ramp-shaped bevel 11 on its side facing away from the sealing ring 48.
  • a recess 52 is provided in the cover 1 of the cylinder 4, through which the piston rod 53 is guided out of the cylinder 4.
  • a sealing ring 51 which is mounted in a groove arranged in the wall of the recess 52 and bears sealingly on the piston rod 53, prevents pressure medium from escaping from the first pressure medium chamber 3 through the recess 52 to the atmosphere.
  • a pressure medium connection 40 is provided on the cylinder housing 4, which is connected on the one hand via a supply line 38 to a pressure medium source 39 and on the other hand to a channel arranged in the cylinder bottom and serving as a pressure medium distributor 37.
  • the pressure medium distributor 37 has a first outlet 36 and a second outlet 20.
  • the first exit is 36 Via a pressure medium line 35 connected to the input of a first inlet valve 28, the output of which is connected via a pressure medium line 34 to the pressure medium connection 50 assigned to the first pressure medium chamber 3.
  • a pressure medium line 33 branching off from the pressure medium line 34 leads to the input of a first outlet valve 30, the output of which is connected via a pressure medium line 32 and a pressure medium connection 55 to the intermediate space 41 delimited by the two pistons 15, 16, 8.
  • the inlet valve 28 and the outlet valve 30 are designed as electromagnetic valves.
  • the electromagnetic valves 28, 30 can be connected to a voltage source via electrical lines 27, 29 and a switching device (not shown).
  • the second outlet 20 of the pressure medium distributor 37 is connected to the inlet of a second inlet valve 23 via a pressure medium line 21.
  • the outlet of the second inlet valve 23 is connected via a pressure medium line 19 to the pressure medium connection 18 assigned to the second pressure medium chamber 17.
  • Via a pressure medium line 26, which branches off from the pressure medium line 19, the pressure medium connection 18 is connected to the input of a second outlet valve 24, the output of which via a pressure medium line 32 and the pressure medium connection 55 with the intermediate space 41 in delimited by the two pistons 8, 15, 16 Connection is established.
  • the inlet valve 23 and the outlet valve 24 are designed as electromagnetic valves which can be connected to a voltage source via electrical lines 22, 25 and the switching device (not shown).
  • each pressure medium chamber can be assigned a valve device designed as a three / two-way valve.
  • the one of the two Piston 15, 16, 8 limited space 41 can be connected to the atmosphere via a third valve device designed as a check valve 42, 43.
  • the check valve 42, 43 is formed by a rubber plate 43 and a housing projection which delimits a housing recess 45 and is designed as a valve seat 42, the rubber plate 42 being fastened to a projection of the cylinder by means of a screw 46.
  • the retaining force of the check valve 42, 43 can be adjusted by means of the screw 46.
  • the check valve 42, 43 is protected against external influences by a cap 44, which is also held by the screw 46.
  • first piston 15, 16 connected to the piston rod 53 has assumed the central position. Pressure is present in the first pressure medium chamber 3 and in the second pressure medium chamber 17 via the opened inlet valves 28, 23 and the pressure medium connections 50, 18. The pressures in the two pressure medium chambers 3, 17 are the same.
  • the second piston 8 is pressed against the stop 47 fixed to the housing and remains at rest.
  • the first piston 15, 16 is pressed with its stop 12 against the second piston 8. Since the sum of the active surfaces of the two pistons 15, 16, 8 acted upon by the pressure from the first pressure medium chamber 3 is greater than the opposite active surface of the first piston 15, 16 acted upon by the pressure from the second pressure medium chamber 17, the first piston connected to the piston rod 53 remains 15, 16 in the middle position.
  • the inlet valve 28 assigned to the first pressure medium chamber 3 is closed and the outlet valve 30 assigned to the first pressure medium chamber 3 is brought into the open position.
  • the first piston 15, 16 is shifted to the left by the pressure from the second pressure medium chamber 17 and takes the second piston 8 with it with its stop 12.
  • the first pressure medium chamber 3 is vented via the pressure medium lines 34, 33, the opened first outlet valve 30 and the pressure medium line 32 into the recess 45 closed by the check valve 42, 43 and the adjoining space 41 delimited by the two pistons 8, 15, 16 . If the pressure in the intermediate space 41 and in the recess 45 has risen so far that it overcomes the retaining force of the check valve 42, 43, the check valve 42, 43 opens and the excess pressure is released to the atmosphere.
  • first piston 15, 16 is brought into its right end position and thus the piston rod 53 is moved into the cylinder 4, the first inlet valve 28, the second inlet valve 23, the first outlet valve 30 and the second outlet valve 24 are switched over.
  • the first inlet valve 28 is now in the open position and the first outlet valve 30 is closed.
  • the second inlet valve 23 assigned to the second pressure medium chamber 17 is now closed and the second outlet valve 24 assigned to the second pressure medium chamber 17 is now in the open position.
  • the pressure building up in the first pressure medium chamber 3 displaces the first piston 15, 16 and the second Piston 8 to the right in the direction of the second pressure medium chamber 17.
  • the second piston 8 comes to rest with its projection 7 on the stop 47 fixed to the housing and the first piston 15, 16 continues to its right end position.
  • the second pressure medium chamber 17 is via the pressure medium lines 19, 26, the opened outlet valve 24 and the pressure medium line 32 into the recess 45 closed by the check valve 42, 43 and the adjoining space 41 delimited by the two pistons 15, 16, 8 vented into it.
  • the second outlet valve 24 is closed, the second inlet valve 23 is brought into the open position and the second pressure medium chamber 17 is thus vented again.
  • the first piston 15, 16 is moved by the pressure medium from the second pressure medium chamber 17 to the left in the direction of the first pressure medium chamber 3 until it comes to rest with its stop 12 on the end face of the second piston 8 facing it.
  • the pressure in the space 41 and the recess 45 delimited by the two pistons 15, 16, 8 is reduced to the atmosphere via the check valve 42, 43.

Abstract

1. Three-position working cylinder having the following features : a) a first piston (16) equipped with a sealing ring (13) is provided, by means of which the cylinder (4) is divided into a first pressure-medium chamber (3) and a second pressure-medium chamber (17) which is arranged on the other side of the piston (16) relative to the first pressure-medium chamber (3) ; b) there is provided a second piston (8), in the form of an annular piston, which is sealed with respect to the inner wall of the cylinder and with respect to an outer surface of the first piston (16) ; c) there is provided a stop (47) which is fixed to the housing and limits the traval of the second piston (8) ; d) on at least one of the two pistons (16, 8) there is provided a stop (12) which limits the sliding movement of the two pistons (16, 8) towards one another ; e) a space (41) located between the two pistons (16, 8), which are guided in sealed manner, can be connected to the atmosphere via a recess (45) arranged in the cylinder housing (4) ; f) the first pressure-medium chamber (3) and the second pressure-medium chamber (17) can each be charged with air and vented by means of a valve arrangement (28, 30, 23, 24) ; characterised by the following features : g) the venting outlets of the valve arrangement (28, 30, 23, 24) are connected to the space (41) bounded by the two pistons (16, 8) ; h) there is provided a third valve arrangement (42, 43) serving as a discharge value, via which the space (41) can be connected to the atmosphere when a pressure exceeding atmospheric pressure builds up in the space (41), and which moves into the closed position when the pressure in the space (41) has fallen to such an extent that the closing force of the valve arrangement (42, 43) exceeds the force of the pressure in the space (41).

Description

Die Erfindung betrifft einen Arbeitszylinder mit drei Stellungen gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a working cylinder with three positions according to the preamble of claim 1.

Ein derartiger Arbeitszylinder ist aus der DE-AS 15 76 175 bekannt. In einem Zylinder ist ein mit einer Kolbenstange versehener erster Kolben angeordnet, welcher den Zylinder in eine kolbenstangenseitige erste Druckmittelkammer und eine bezüglich der ersten Druckmittelkammer auf der anderen Seite des Kolbens angeordnete zweite Druckmittelkammer unterteilt. Auf dem ersten Kolben ist ein als Ringkolben ausgebildeter zweiter Kolben abgedichtet verschiebbar angeordnet. Der zweite Kolben ist gegen eine die Mittelstellung fixierende Abstufung des Zylindergehäuses bewegbar.Such a working cylinder is known from DE-AS 15 76 175. Arranged in a cylinder is a first piston provided with a piston rod, which divides the cylinder into a first pressure medium chamber on the piston rod side and a second pressure medium chamber arranged on the other side of the piston with respect to the first pressure medium chamber. On the first piston, a second piston designed as an annular piston is arranged such that it can be moved and sealed. The second piston is against one gradation of the cylinder housing which fixes the middle position is movable.

Um bei einer Bewegung der beiden Kolben aufeinander zu die Bildung von Staudruck in dem von den beiden Kolben begrenzten Zwischenraum zu verhindern und um umgekehrt bei einer Bewegung der beiden Kolben voneinander weg die Bildung eines Vakuums im Zwischenraum zu vermeiden, ist im Bereich des Zwischenraums in der Zylinderwand eine zur Atmosphäre hin führende Atmungsbohrung vorgesehen.In order to prevent the formation of dynamic pressure in the space delimited by the two pistons when the two pistons move towards one another and, conversely, to avoid the formation of a vacuum in the space when the two pistons move away from one another, in the area of the space in the Cylinder wall provided a breathing hole leading to the atmosphere.

Eine solche Atmungsbohrung hat den Nachteil, daß Feuchtigkeit und Schmutz in den Zylinder eindringen können. Würde man daran denken, das Eindringen von Feuchtigkeit und Schmutz dadurch zu verhindern, daß man im oder am Ausgang der Atmungsbohrung ein zur Atmosphäre hin in die Offenstellung bringbares Rückschlagventil anordnet, so würde trotzdem der Nachteil der Vakuumbildung bestehen bleiben.Such a breathing hole has the disadvantage that moisture and dirt can penetrate into the cylinder. If you were to think of preventing the ingress of moisture and dirt by arranging a check valve which can be brought into the open position to the atmosphere in or at the outlet of the breathing bore, the disadvantage of vacuum formation would still remain.

Der Erfindung liegt die Aufgabe zugrunde, einen Arbeitszylinder der eingangs erwähnten Art zu schaffen, der mit einfachen Mitteln eine Beatmung des von den beiden Kolben begrenzten Zwischenraumes ermöglicht, ohne daß die vorgenannten Nachteile in Kauf genommen werden müssen.The invention has for its object to provide a cylinder of the type mentioned, which allows ventilation of the space delimited by the two pistons with simple means without the aforementioned disadvantages have to be accepted.

Diese Aufgabe wird mit der im Patentanspruch 1 angegebenen Erfindung gelöst. Weiterbildungen und vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen angegeben.This object is achieved with the invention specified in claim 1. Further developments and advantageous refinements of the invention are specified in the subclaims.

Die Erfindung bietet insbesondere den Vorteil, durch die Verbindung des von den beiden Kolben begrenzten Raumes mit den zur Entlüftung der beiden Druckmittelkammern des Zylinders dienenden Ventileinrichtungen ein Be- und Entlüftungssystem für alle Kammern des Arbeitszylinders zu erhalten, welches ein Verschmutzen des Zylinderraumes verhindert und die Verwendung dieses Zylinders auch an feuchten und staubigen Einsatzorten ermöglicht.The invention offers in particular the advantage of connecting the one delimited by the two pistons Room with the valve devices for venting the two pressure medium chambers of the cylinder to obtain a ventilation system for all chambers of the working cylinder, which prevents the cylinder chamber from becoming dirty and enables the use of this cylinder even in damp and dusty locations.

Ein weiterer Vorteil der Erfindung ist noch darin zu sehen, daß bei entsprechender Dimensionierung des Auslaßventils für den von den beiden Kolben begrenzten Zwischenraum sowie entsprechende Auslegung der Verbindungsleitungen und der Kolbenwirkflächen die Kolbenbewegung in Richtung auf den jeweils nicht vom Druckmittel zu beaufschlagenden Raum zu vom Druck aus dem zu entlüftenden Raum unterstützt wird.Another advantage of the invention is to be seen in the fact that with appropriate dimensioning of the outlet valve for the space delimited by the two pistons and appropriate design of the connecting lines and the piston active surfaces, the piston movement in the direction of the space not to be acted upon by the pressure medium from the pressure the room to be ventilated is supported.

Anhand der Abbildung wird nachstehend ein Ausführungsbeispiel der Erfindung näher erläutert.An exemplary embodiment of the invention is explained in more detail below with the aid of the figure.

Die Abbildung zeigt einen Arbeitszylinder mit drei Stellungen im Schnitt.The illustration shows a working cylinder with three positions on average.

In einem Zylinder 4, welcher unter Zwischenschaltung eines Dichtringes 2 von einem Deckel 1 verschlossen wird, ist ein mit einer Kolbenstange 53 versehener erster Kolben 15, 16 verschiebbar angeordnet. Der erste Kolben 15, 16 unterteilt den Zylinder in eine kolbenstangenseitige erste Druckmittelkammer 3 und eine bezüglich der ersten Druckmittelkammer 3 auf der anderen Seite des Kolbens 15, 16 liegende zweite Druckmittelkammer 17. Die beiden Druckmittelkammern 3 und 17 sind über je einen Druckmittelanschluß 50 bzw. 18 und eine noch näher zu erläuternde Ventileinrichtung be- und entlüftbar. Der erste Kolben 15, 16 weist auf seiner der zweiten Druckmittelkammer 17 zugewandten Seite eine ballig ausgebildete umlaufende Führung 15 auf. In einer Nut 14, deren Flanken einerseits von der balligen Führung 15 und andererseits von einem als Anschlag 12 dienenden umlaufenden Vorsprung des Kolbens 15, 16 gebildet werden, ist ein Nutring 13 gelagert. Der Nutring 13 dichtet die zweite Druckmittelkammer 17 gegen die erste Druckmittelkammer 3 ab.In a cylinder 4, which is closed by a cover 1 with the interposition of a sealing ring 2, a first piston 15, 16 provided with a piston rod 53 is displaceably arranged. The first piston 15, 16 divides the cylinder into a first pressure medium chamber 3 on the piston rod side and a second pressure medium chamber 17 located on the other side of the piston 15, 16 with respect to the first pressure medium chamber 3. The two pressure medium chambers 3 and 17 are each connected via a pressure medium connection 50 or 18 and a valve device to be explained in more detail below ventable. The first piston 15, 16 has on its side facing the second pressure medium chamber 17 a spherical guide 15. A groove ring 13 is supported in a groove 14, the flanks of which are formed on the one hand by the spherical guide 15 and on the other hand by a circumferential projection of the piston 15, 16 serving as a stop 12. The groove ring 13 seals the second pressure medium chamber 17 against the first pressure medium chamber 3.

Auf dem ersten Kolben 15, 16 ist ein als Ringkolben ausgebildeter zweiter Kolben 8 relativ zum ersten Kolben 15, 16 verschiebbar angeordnet. Der zweite Kolben 8 besitzt einen sich radial nach außen erstreckenden umlaufenden Vorsprung 7, mit welchem der zweite Kolben 8 bei einer Bewegung in Richtung auf die zweite Druckmittelkammer 17 zu an einem gehäusefesten Anschlag 47 zur Anlage bringbar ist. Der gehäusefeste Anschlag 47 wird von einer Abstufung des Zylinders 4 gebildet und dient zur Fixierung der beiden Kolben 15, 16, 8 in der Mittelstellung. In einer Nut 5 des zweiten Kolben 8, deren Flanken einerseits vom Vorsprung 7 und andererseits von einem weiteren umlaufenden Vorsprung 54, welcher an der der ersten Druckmittelkammer 3 zugewandten Seite des zweiten Kolbens 8 vorgesehen ist, gebildet werden, ist ein Nutring 6 gelagert. Der Nutring 6 dichtet die erste Druckmittelkammer 3 gegen die zweite Druckmittelkammer 17 ab. Zur Abdichtung des von den beiden teleskopartig zusammenwirkenden Kolben 15, 16, 8 begrenzten Zwischenraumes 41 ist ein zusätzlicher Dichtring 48 zwischen der Mantelfläche des ersten Kolbens 15, 16 und der inneren Wandung des zweiten Kolbens 8 angeordnet. Der als Nutring ausgebildete zusätzliche Dichtring 48 ist in diesem Ausführungsbeispiel in einer in der Mantelfläche des ersten Kolbens 15, 16 vorgesehenen Nut 49 gelagert, welche in dem der ersten Druckmittelkammer 3 zugewandten Endbereich des ersten Kolbens 15, 16 vorgesehen ist. Der zweite Kolben 8 weist in seinem dem ersten Kolben 15, 16 zugewandten Endbereich einen sich radial nach innen, in Richtung auf die Mantelfläche des ersten Kolbens 15, 16 zu erstreckenden, vorzugsweise umlaufenden Vorsprung 9, 10,11 auf. Der Vorsprung dient als Anschlag, welcher bei einer Bewegung der beiden Kolben 15, 16, 8 voneinander weg an dem zwischen den beiden Kolben 15, 16, 8 auf dem ersten Kolben 15, 16 angeordneten Dichtring 48 zur Anlage bringbar ist.On the first piston 15, 16, a second piston 8 designed as an annular piston is arranged so as to be displaceable relative to the first piston 15, 16. The second piston 8 has a radially outwardly extending circumferential projection 7, with which the second piston 8 can be brought into contact with a stop 47 fixed to the housing during a movement in the direction of the second pressure medium chamber 17. The stop 47 fixed to the housing is formed by a gradation of the cylinder 4 and serves to fix the two pistons 15, 16, 8 in the central position. A groove ring 6 is supported in a groove 5 of the second piston 8, the flanks of which are formed on the one hand by the projection 7 and on the other hand by a further circumferential projection 54, which is provided on the side of the second piston 8 facing the first pressure medium chamber 3. The groove ring 6 seals the first pressure medium chamber 3 against the second pressure medium chamber 17. To seal the space 41 delimited by the two telescopically interacting pistons 15, 16, 8, an additional sealing ring 48 is arranged between the outer surface of the first piston 15, 16 and the inner wall of the second piston 8. The additional designed as a grooved ring In this exemplary embodiment, sealing ring 48 is mounted in a groove 49 provided in the lateral surface of the first piston 15, 16, which is provided in the end region of the first piston 15, 16 facing the first pressure medium chamber 3. In its end region facing the first piston 15, 16, the second piston 8 has a preferably circumferential projection 9, 10, 11, which extends radially inwards in the direction of the lateral surface of the first piston 15, 16. The projection serves as a stop which, when the two pistons 15, 16, 8 move away from one another, can be brought into contact with the sealing ring 48 arranged between the two pistons 15, 16, 8 on the first piston 15, 16.

Der Anschlag 9, 10, 11 weist auf seiner dem Dichtirng 48 zugewandten Seite eine steile Kante 9 und auf seiner dem Dichtring 48 abgewandten Seite eine rampenförmige Abschrägung 11 auf.The stop 9, 10, 11 has a steep edge 9 on its side facing the sealing ring 48 and a ramp-shaped bevel 11 on its side facing away from the sealing ring 48.

Im Deckel 1 des Zylinders 4 ist eine Ausnehmung 52 vorgesehen, durch welche die Kolbenstange 53 aus dem Zylinder 4 herausgeführt wird. Ein Dichtring 51, der in einer in der Wandung der Ausnehmung 52 angeordneten Nut gelagert ist und dichtend an der Kolbenstange 53 anliegt, verhindert ein Austreten von Druckmittel aus der ersten Druckmittelkammer 3 durch die Ausnehmung 52 zur Atmosphäre hin.A recess 52 is provided in the cover 1 of the cylinder 4, through which the piston rod 53 is guided out of the cylinder 4. A sealing ring 51, which is mounted in a groove arranged in the wall of the recess 52 and bears sealingly on the piston rod 53, prevents pressure medium from escaping from the first pressure medium chamber 3 through the recess 52 to the atmosphere.

Am Zylindergehäuse 4 ist ein Druckmittelanschluß 40 vorgesehen, welcher einerseits über eine Vorratsleitung 38 mit einer Druckmittelquelle 39 und andererseits mit einem im Zylinderboden angeordneten, als Druckmittelverteiler 37 dienenden Kanal verbunden ist. Der Druckmittelverteiler 37 weist einen ersten Ausgang 36 und einen zweiten Ausgang 20 auf. Der erste Ausgang 36 ist über eine Druckmittelleitung 35 an den Eingang eines ersten Einlaßventils 28 angeschlossen, dessen Ausgang über eine Druckmittelleitung 34 mit dem der ersten Druckmittelkammer 3 zugeordneten Druckmittelanschluß 50 verbunden ist. Eine von der Druckmittelleitung 34 abzweigende Druckmittelleitung 33 führt zum Eingang eines ersten Auslaßventils 30, dessen Ausgang über eine Druckmittelleitung 32 und einen Druckmittelanschluß 55 mit dem von den beiden Kolben 15, 16, 8 begrenzten Zwischenraum 41 verbunden ist. Das Einlaßventil 28 und das Auslaßventil 30 sind als Elektromagnetventile ausgebildet. Über elektrische Leitungen 27, 29 und eine nicht dargestellte Schalteinrichtung sind die Elektromagnetventile 28, 30 mit einer Spannungsquelle verbindbar.A pressure medium connection 40 is provided on the cylinder housing 4, which is connected on the one hand via a supply line 38 to a pressure medium source 39 and on the other hand to a channel arranged in the cylinder bottom and serving as a pressure medium distributor 37. The pressure medium distributor 37 has a first outlet 36 and a second outlet 20. The first exit is 36 Via a pressure medium line 35 connected to the input of a first inlet valve 28, the output of which is connected via a pressure medium line 34 to the pressure medium connection 50 assigned to the first pressure medium chamber 3. A pressure medium line 33 branching off from the pressure medium line 34 leads to the input of a first outlet valve 30, the output of which is connected via a pressure medium line 32 and a pressure medium connection 55 to the intermediate space 41 delimited by the two pistons 15, 16, 8. The inlet valve 28 and the outlet valve 30 are designed as electromagnetic valves. The electromagnetic valves 28, 30 can be connected to a voltage source via electrical lines 27, 29 and a switching device (not shown).

In gleicher Weist ist der zweite Ausgang 20 des Druckmittelverteilers 37 über eine Druckmittelleitung 21 mit dem Eingang eines zweiten Einlaßventils 23 verbunden. Der Ausgang des zweiten Einlaßventils 23 ist über eine Druckmittelleitung 19 an den der zweiten Druckmittelkammer 17 zugeordneten Druckmittelanschluß 18 angeschlossen. Über eine Druckmittelleitung 26, welche von der Druckmittelleitung 19 abzweigt, ist der Druckmittelanschluß 18 mit dem Eingang eines zweiten Auslaßventils 24 verbunden, dessen Ausgang über eine Druckmittelleitung 32 und den Druckmittelanschluß 55 mit dem von den beiden Kolben 8, 15, 16 begrenzten Zwischenraum 41 in Verbindung steht. Das Einlaßventil 23 und das Auslaßventil 24 sind als Elektromagnetventile ausgebildet, die-über elektrische Leitungen 22, 25 und die nicht dargestellte Schalteinrichtung mit einer Spannungsquelle verbindbar sind.In the same way, the second outlet 20 of the pressure medium distributor 37 is connected to the inlet of a second inlet valve 23 via a pressure medium line 21. The outlet of the second inlet valve 23 is connected via a pressure medium line 19 to the pressure medium connection 18 assigned to the second pressure medium chamber 17. Via a pressure medium line 26, which branches off from the pressure medium line 19, the pressure medium connection 18 is connected to the input of a second outlet valve 24, the output of which via a pressure medium line 32 and the pressure medium connection 55 with the intermediate space 41 in delimited by the two pistons 8, 15, 16 Connection is established. The inlet valve 23 and the outlet valve 24 are designed as electromagnetic valves which can be connected to a voltage source via electrical lines 22, 25 and the switching device (not shown).

Anstelle der als Einlaßventil und Auslaßventil ausgebildeten Elektromagnetventile kann jeder Druckmittelkammer eine als drei/zwei-Wegeventil ausgebildete Ventileinrichtung zugeordnet werden. Der von den beiden Kolben 15, 16, 8 begrenzte Zwischenraum 41 ist über eine als Rückschlagventil 42, 43 ausgebildete dritte Ventileinrichtung mit der Atmosphäre verbindbar. Das Rückschlagventil 42, 43 wird in diesem Ausführungsbeispiel von einem Gummiteller 43 und einem eine Gehäuseausnehmung 45 begrenzenden, als Ventilsitz 42 ausgebildeten Gehäusevorsprung gebildet, wobei der Gummiteller 42 mittels einer Schraube 46 an einen Vorsprung des Zylinders befestigt ist. Mittels der Schraube 46 ist die Rückhaltekraft des Rückschlagventils 42, 43 einstellbar. Das Rückschlagventil 42, 43 ist durch eine Kappe 44, die ebenfalls von der Schraube 46 gehalten wird, gegen äußere Einflüsse geschützt. Die Funktion des im Vorstehenden beschriebenen Arbeitszylinders wird nachfolgend näher erläutert.Instead of the solenoid valves designed as inlet valve and outlet valve, each pressure medium chamber can be assigned a valve device designed as a three / two-way valve. The one of the two Piston 15, 16, 8 limited space 41 can be connected to the atmosphere via a third valve device designed as a check valve 42, 43. In this exemplary embodiment, the check valve 42, 43 is formed by a rubber plate 43 and a housing projection which delimits a housing recess 45 and is designed as a valve seat 42, the rubber plate 42 being fastened to a projection of the cylinder by means of a screw 46. The retaining force of the check valve 42, 43 can be adjusted by means of the screw 46. The check valve 42, 43 is protected against external influences by a cap 44, which is also held by the screw 46. The function of the working cylinder described above is explained in more detail below.

Es wird angenommen, daß der mit der Kolbenstange 53 verbundene erste Kolben 15, 16, wie in der Abbildung dargestellt, die Mittelstellung eingenommen hat. Über die geöffneten Einlaßventile 28, 23 sowie die Druckmittelanschlüsse 50, 18 steht in der ersten Druckmittelkammer 3 und in der zweiten Druckmittelkammer 17 Druck an. Die Drücke in den beiden Druckmittelkammern 3, 17 sind gleich. Der zweite Kolben 8 wird gegen den gehäusefesten Anschlag 47 angedrückt und bleibt in Ruhe. Der erste Kolben 15, 16 wird mit seinem Anschlag 12 gegen den zweiten Kolben 8 angedrückt. Da die Summe der vom Druck aus der ersten Druckmittelkammer 3 beaufschlagten Wirkflächen der beiden Kolben 15, 16, 8 größer ist als die vom Druck aus der zweiten Druckmittelkammer 17 beaufschlagte entgegengerichtete Wirkfläche des ersten Kolbens 15, 16 verbleibt der mit der Kolbenstange 53 verbundene erste Kolben 15, 16 in der Mittelstellung.It is assumed that the first piston 15, 16 connected to the piston rod 53, as shown in the figure, has assumed the central position. Pressure is present in the first pressure medium chamber 3 and in the second pressure medium chamber 17 via the opened inlet valves 28, 23 and the pressure medium connections 50, 18. The pressures in the two pressure medium chambers 3, 17 are the same. The second piston 8 is pressed against the stop 47 fixed to the housing and remains at rest. The first piston 15, 16 is pressed with its stop 12 against the second piston 8. Since the sum of the active surfaces of the two pistons 15, 16, 8 acted upon by the pressure from the first pressure medium chamber 3 is greater than the opposite active surface of the first piston 15, 16 acted upon by the pressure from the second pressure medium chamber 17, the first piston connected to the piston rod 53 remains 15, 16 in the middle position.

Soll der mit der Kolbenstange 53 verbundene erste Kolben 15, 16 in seine linke Endlage gebracht werden, so wird das der ersten Druckmittelkammer 3 zugeordnete Einlaßventil 28 geschlossen und das der ersten Druckmittelkammer 3 zugeordnete Auslaßventil 30 in die Offenstellung gebracht. Vom Druck aus der zweiten Druckmittelkammer 17 wird der erste Kolben 15, 16 nach links verschoben und nimmt mit seinem Anschlag 12 den zweiten Kolben 8 mit. Gleichzeitig wird die erste Druckmittelkammer 3 über die Druckmittelleitungen 34, 33, das geöffnete erste Auslaßventil 30 sowie die Druckmittelleitung 32 in die vom Rückschlagventil 42, 43 abgeschlossene Ausnehmung 45 und den daran anschließenden, von den beiden Kolben 8, 15, 16 begrenzten Zwischenraum 41 hineinentlüftet. Ist der Druck im Zwischenraum 41 und in der Ausnehmung 45 soweit angestiegen, daß er die Rückhaltekraft des Rückschlagventils 42, 43 überwindet, öffnet das Rückschlagvnetil 42, 43 und der überschüssige Druck wird zur Atmosphäre hin abgebaut.If the first piston 15, 16 connected to the piston rod 53 is to be brought into its left end position, the inlet valve 28 assigned to the first pressure medium chamber 3 is closed and the outlet valve 30 assigned to the first pressure medium chamber 3 is brought into the open position. The first piston 15, 16 is shifted to the left by the pressure from the second pressure medium chamber 17 and takes the second piston 8 with it with its stop 12. At the same time, the first pressure medium chamber 3 is vented via the pressure medium lines 34, 33, the opened first outlet valve 30 and the pressure medium line 32 into the recess 45 closed by the check valve 42, 43 and the adjoining space 41 delimited by the two pistons 8, 15, 16 . If the pressure in the intermediate space 41 and in the recess 45 has risen so far that it overcomes the retaining force of the check valve 42, 43, the check valve 42, 43 opens and the excess pressure is released to the atmosphere.

Soll der erste Kolben 15,,16 in seine rechte Endlage gebracht und so dìeder Kolbenstange 53 in den Zylinder 4 eingefahren werden, werden das erste Einlaßventil 28, das zweite Einlaßventil 23, das erste Auslaßventil 30 und das zweite Auslaßventil 24 umgeschaltet. Das erste Einlaßventil 28 befindet sich jetzt in der Offenstellung und das erste Auslaßventil 30 ist geschlossen. Das der zweiten Druckmittelkammer 17 zugeordnete zweite Einlaßventil 23 ist jetzt geschlossen und das der zweiten Druckmittelkammer 17 zugeordnete zweite Auslaßventil 24 befindet sich jetzt in der Offenstellung. Der sich in der ersten Druckmittelkammer 3 aufbauende Druck verschiebt den ersten Kolben 15, 16 und den zweiten Kolben 8 nach rechts in Richtung auf die zweite Druckmittelkammer 17 zu. Der zweite Kolben 8 kommt mit seinem Vorsprung 7 am gehäusefesten Anschlag 47 zur Anlage und der erste Kolben 15, 16 fährt weiter bis in seine rechte Endlage. Während dieses Vorganges wird die zweite Druckmittelkammer 17 über die Druckmittelleitungen 19, 26, das geöffnete Auslaßventil 24 sowie die Druckmittelleitung 32 in die vom Rückschlagventil 42, 43 abgeschlossene Ausnehmung 45 sowie den daran anschließenden, von den beiden Kolben 15, 16, 8 begrenzten Zwischenraum 41 hineinentlüftet.If the first piston 15, 16 is brought into its right end position and thus the piston rod 53 is moved into the cylinder 4, the first inlet valve 28, the second inlet valve 23, the first outlet valve 30 and the second outlet valve 24 are switched over. The first inlet valve 28 is now in the open position and the first outlet valve 30 is closed. The second inlet valve 23 assigned to the second pressure medium chamber 17 is now closed and the second outlet valve 24 assigned to the second pressure medium chamber 17 is now in the open position. The pressure building up in the first pressure medium chamber 3 displaces the first piston 15, 16 and the second Piston 8 to the right in the direction of the second pressure medium chamber 17. The second piston 8 comes to rest with its projection 7 on the stop 47 fixed to the housing and the first piston 15, 16 continues to its right end position. During this process, the second pressure medium chamber 17 is via the pressure medium lines 19, 26, the opened outlet valve 24 and the pressure medium line 32 into the recess 45 closed by the check valve 42, 43 and the adjoining space 41 delimited by the two pistons 15, 16, 8 vented into it.

Wird wieder die neutrale Mittelstellung gewünscht, so wird das zweite Auslaßventil 24 geschlossen, das zweite Einlaßventil 23 in die Offenstellung gebracht und so die zweite Druckmittelkammer 17 wieder belüftet. Der erste Kolben 15, 16 wird vom Druckmittel aus der zweiten Druckmittelkammer 17 nach links in Richtung auf die erste Druckmittelkammer 3 zu verschoben und zwar so weit, bis er mit seinem Anschlag 12 an der ihm zugewandten Stirnseite des zweiten Kolbens 8 zur Anlage kommt. Der Druck in dem von den beiden Kolben 15, 16, 8 begrenzten Zwischenraum 41 und der Ausnehmung 45 wird über das Rückschlagventil 42, 43 zur Atmosphäre hin abgebaut.If the neutral center position is desired again, the second outlet valve 24 is closed, the second inlet valve 23 is brought into the open position and the second pressure medium chamber 17 is thus vented again. The first piston 15, 16 is moved by the pressure medium from the second pressure medium chamber 17 to the left in the direction of the first pressure medium chamber 3 until it comes to rest with its stop 12 on the end face of the second piston 8 facing it. The pressure in the space 41 and the recess 45 delimited by the two pistons 15, 16, 8 is reduced to the atmosphere via the check valve 42, 43.

Es ist selbstverständlich möglich, die zu den Einlaßventilen und den Auslaßventilen hin bzw. die von den Einlaßventilen und von den Auslaßventilen wegführenden Druckmittelleitungen in Form von Kanälen im Zylindergehäuse anzuordnen.It is of course possible to arrange the pressure medium lines leading to the intake valves and the exhaust valves or the pressure medium lines leading away from the intake valves and from the exhaust valves in the form of channels in the cylinder housing.

Claims (5)

1. Arbeitszylinder mit drei Stellungen, welcher die folgenden Merkmale aufweist: a) es ist ein mit einem Dichtring versehener erster Kolben (15,16) vorgesehen, durch welchen der Zylinder in eine erste Druckmittelkammer (3) und eine bezüglich der ersten Druckmittelkammer (3) auf der anderen Seite des Kolbens (15,16) angeordnete zweite Druckmittelkammer (17) unterteilt ist; b) es ist ein als Ringkolben ausgebildeter zweiter Kolben (8) vorgesehen, der gegenüber der Zylinderinnenwand und einer äußeren Mantelfläche des ersten Kolbens (15,16) abgedichtet geführt ist; c) die erste Druckmittelkammer (3) und die zweite Druckmittelkammer (17) sind jeweils mittels einer Ventileinrichtung be- und entlüftbar;
gekennzeichnet durch die folgenden Merkmale: d) die Endlüftungsausgänge der Ventileinrichtungen (28,30,23,24) sind mit dem von den beiden Kolben (15,16,8) begrenzten Zwischenraum (41,45) verbunden; e) es ist eine dritte Ventileinrichtung (42,43) vorgesehen, über welche der Zwischenraum (41,45) mit der Atmosphäre verbindbar ist. 1. Working cylinder with three positions, which has the following features: a) a first piston (15, 16) provided with a sealing ring is provided, through which the cylinder is arranged in a first pressure medium chamber (3) and one with respect to the first pressure medium chamber (3) on the other side of the piston (15, 16) second pressure medium chamber (17) is divided; b) a second piston (8) designed as an annular piston is provided, which is guided in a sealed manner with respect to the inner wall of the cylinder and an outer lateral surface of the first piston (15, 16); c) the first pressure medium chamber (3) and the second pressure medium chamber (17) can each be aerated and vented by means of a valve device;
characterized by the following features: d) the end ventilation outlets of the valve devices (28, 30, 23, 24) are connected to the intermediate space (41, 45) delimited by the two pistons (15, 16, 8); e) a third valve device (42, 43) is provided, via which the intermediate space (41, 45) can be connected to the atmosphere. 2. Arbeitszylinder nach Anspruch 1, dadurch gekennzeichnet, daß die dritte Ventileinrichtung (42,43) als zur Atmosphäre hin öffnendes Rückschlagventil ausgebildet ist.2. Working cylinder according to claim 1, characterized in that the third valve device (42,43) is designed as a check valve opening to the atmosphere. 3. Arbeitszylinder nach Anspruch 2, dadurch gekennzeichnet, daß die Rückhaltekraft des Rückschlagventils (42,43) veränderbar ist.3. Working cylinder according to claim 2, characterized in that the retaining force of the check valve (42, 43) is variable. 4. Arbeitszylinder nach wenigstens einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die zum Be- und Entlüften der Druckmittelkammern (3,17) vorgesehenen Ventileinrichtungen als Elektromagnetventile ausgebildete Einlaß- und Auslaßventile aufweisen.4. Working cylinder according to at least one of the preceding claims, characterized in that the valve means provided for ventilating the pressure medium chambers (3, 17) have inlet and outlet valves designed as electromagnetic valves. 5. Arbeitszylinder nach wenigstens einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Verbindungen zwischen den Ventileinrichtungen und dem von den beiden Kolben begrenzten Zwischenraum (41,45) durch interne im Gehäuse angeordnete Kanäle hergestellt werden.5. Working cylinder according to at least one of the preceding claims, characterized in that the connections between the valve devices and the space delimited by the two pistons (41, 45) are produced by internal channels arranged in the housing.
EP84111140A 1983-10-19 1984-09-19 Three-position actuating cylinder Expired EP0143238B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84111140T ATE28763T1 (en) 1983-10-19 1984-09-19 POWER CYLINDER WITH THREE POSITIONS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3337969 1983-10-19
DE19833337969 DE3337969A1 (en) 1983-10-19 1983-10-19 WORK CYLINDER WITH THREE POSITIONS

Publications (2)

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EP0143238A1 true EP0143238A1 (en) 1985-06-05
EP0143238B1 EP0143238B1 (en) 1987-08-05

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Family Applications (1)

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EP84111140A Expired EP0143238B1 (en) 1983-10-19 1984-09-19 Three-position actuating cylinder

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EP (1) EP0143238B1 (en)
AT (1) ATE28763T1 (en)
DE (2) DE3337969A1 (en)

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EP2290263A3 (en) * 2009-08-31 2011-04-13 ZF Friedrichshafen AG Method of synchronisation, actuator and switching device with actuator
WO2017137321A1 (en) * 2016-02-11 2017-08-17 Voith Patent Gmbh Gearshifting device for a transmission

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GB9622893D0 (en) * 1996-11-02 1997-01-08 Lucas Ind Plc Piston actuator
AT407661B (en) * 1998-08-04 2001-05-25 Hygrama Ag PRESSURE CYLINDER, SWITCH VALVE AND PRESSURE-OPERATED WORKING UNIT

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FR830896A (en) * 1937-01-14 1938-08-11 Bolinder Munktell Hydraulic control device for engine reversing devices, and in particular for boat engines
US2604878A (en) * 1948-01-03 1952-07-29 Westinghouse Air Brake Co Fluid pressure motor
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SE414527B (en) * 1978-11-07 1980-08-04 Volvo Ab CYLINDER WITH TWICE STEP, SPECIFICALLY A SWEAT CYLINDER
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HU187364B (en) * 1981-04-16 1985-12-28 Autoipari Kutato Intezet Pneumatic three-position working cylinder particularly for stageslector mechanism of motor vehicle
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Publication number Priority date Publication date Assignee Title
FR830896A (en) * 1937-01-14 1938-08-11 Bolinder Munktell Hydraulic control device for engine reversing devices, and in particular for boat engines
US2604878A (en) * 1948-01-03 1952-07-29 Westinghouse Air Brake Co Fluid pressure motor
DE1576175B1 (en) * 1966-11-15 1971-12-23 Barkas Werke Veb Pressurized working cylinder with double-sided loading, especially for switching gearboxes for motor vehicles

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2290263A3 (en) * 2009-08-31 2011-04-13 ZF Friedrichshafen AG Method of synchronisation, actuator and switching device with actuator
WO2017137321A1 (en) * 2016-02-11 2017-08-17 Voith Patent Gmbh Gearshifting device for a transmission

Also Published As

Publication number Publication date
DE3337969C2 (en) 1992-07-16
DE3465210D1 (en) 1987-09-10
ATE28763T1 (en) 1987-08-15
EP0143238B1 (en) 1987-08-05
DE3337969A1 (en) 1985-05-02

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