EP0388586B1 - Pressure-fluid actuator - Google Patents

Pressure-fluid actuator Download PDF

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Publication number
EP0388586B1
EP0388586B1 EP90101128A EP90101128A EP0388586B1 EP 0388586 B1 EP0388586 B1 EP 0388586B1 EP 90101128 A EP90101128 A EP 90101128A EP 90101128 A EP90101128 A EP 90101128A EP 0388586 B1 EP0388586 B1 EP 0388586B1
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EP
European Patent Office
Prior art keywords
support
housing
cylinder
actuated
pressure medium
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
EP90101128A
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German (de)
French (fr)
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EP0388586A1 (en
EP0388586B2 (en
Inventor
Norbert Fortmann
Rudolf Möller
Helmut Göttling
Gerhard Scharnowski
Hans F. Meyer
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Aventics GmbH
Original Assignee
Mannesmann Rexroth Pneumatik GmbH
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Application filed by Mannesmann Rexroth Pneumatik GmbH filed Critical Mannesmann Rexroth Pneumatik GmbH
Publication of EP0388586A1 publication Critical patent/EP0388586A1/en
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Publication of EP0388586B2 publication Critical patent/EP0388586B2/en
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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
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/084—Characterised by the construction of the motor unit the motor being of the rodless piston type, e.g. with cable, belt or chain
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/18—Mechanical movements
    • Y10T74/18992—Reciprocating to reciprocating

Definitions

  • the invention relates to a pressure-actuated working cylinder with a driver driven by a piston via a flexible tension element according to the preamble of claim 1.
  • Such a working cylinder is known from DE-A-2 830 058.
  • This known working cylinder has guide plates attached to the cylinder housing, each for a deflection device having a deflection element for the tension element.
  • the deflecting elements are designed as deflecting rollers, the deflecting rollers being arranged in the region of the ends of the cylinder housing.
  • Each deflecting roller is arranged on an axis which runs transversely to the longitudinal axis of the cylinder and serves as a support for the deflecting roller and is slidably mounted in a slot-shaped recess of this guide plate which runs parallel to the longitudinal axis of the guide plate and is slidable in the longitudinal direction of the slot-shaped recess.
  • Spring-loaded means are provided, which are supported on the guide plate and load the axis in the direction away from the cylinder, so that the tension element is always kept under tension.
  • the invention has for its object to provide a pressure-actuated working cylinder of the type mentioned, which is compact in its construction and in which a safe guidance of the deflection device and thus the tension element is guaranteed.
  • the invention offers in particular the advantage of being able to form the working cylinder in a space-saving manner by the arrangement of supports for the deflecting elements which are slidably guided in a further housing bore additionally provided in the cylinder housing.
  • each carrier is at least partially designed as a tubular body, into which a spring that acts on the carrier from the cylinder housing extends. This measure considerably reduces the space required for a spring with a large axial extension.
  • an anti-rotation device for the carrier and thus also for the deflection roller is achieved without an additional anti-rotation device having to be provided for this purpose.
  • This anti-rotation device ensures that the tension element is guided securely by means of the deflection element.
  • an anti-rotation device can be achieved by providing a groove running in the longitudinal direction of the housing bore in the wall defining the housing bore, into which a projection provided on the carrier engages.
  • a common housing bore can be provided for both supports, which is divided into two coaxial housing bore parts by an insert.
  • a pressure-actuated working cylinder is shown with a driver driven by a piston via a bendable tension element.
  • the working cylinder has a profiled tube serving as a cylinder housing 1 with a first housing bore 34 running in the direction of the longitudinal axis of the cylinder housing 1.
  • the first housing bore 34 can have a circular cross section, but also a deviating from the circular shape, e.g. have an oval cross-section.
  • a piston 31 is arranged such that it can be displaced in a sealed manner by means of sealing rings 30 and 32.
  • the cross-sectional shape of the piston 31 naturally corresponds to the cross-sectional shape of the first housing bore 34.
  • the first housing bore 34 is closed at both ends by a first cover 2 and a second cover 27.
  • the piston 31 divides the cylinder space into a first working chamber 33 and a second working chamber 29.
  • the first working chamber 33 is connected to a valve device (not shown) via a pressure medium connection 35 and the second working chamber 29 is connected via a second pressure medium connection 28 which the two working chambers 33 and 29 can be connected either to a pressure medium source or to the atmosphere or to a return.
  • first cover 2 there is a passage having a sealing element 3 and in the second cover 27 there is another passage having a sealing element 26, through which a pulling element 25 connected to the piston 31 is sealed and led out of the end faces of the cylinder.
  • a first guide 12 is provided in or on the cylinder housing 1 for a driver 14 guided in the longitudinal direction of the cylinder housing 1.
  • the cylinder housing 1 has a further guide, which is formed in each case by a further housing bore 13 or 16 of the cylinder housing 1, which runs in the direction of the longitudinal axis of the cylinder housing 1.
  • the two further housing bores 13, 16 have a rectangular cross section.
  • the two further housing bores 13 and 16 are formed by a bore which penetrates the cylinder housing 1 in the longitudinal direction and is divided into the two housing bores 13 and 16 by an insert (15) arranged in this bore.
  • One housing bore 13 is referred to below as the first bore section 13 and the other housing bore 16 is referred to below as the second bore section 16.
  • the further guide is arranged in the area between the first housing bore 34 and the first guide 12 provided in or on the cylinder housing 1 for the driver 14, which is also connected to the tension element 25.
  • the longitudinal axis of the first housing bore 34, the longitudinal axis of the further guide 13, 16 and the longitudinal axis of the first guide 12 for the driver 14 run parallel to one another and parallel to the longitudinal axis of the cylinder housing 1.
  • first carrier 11, for a first roller 8 serving as a deflecting element for the tension element 25, which can be displaced in the direction of the longitudinal axis of the second housing bore 13, 16.
  • a second support 17, 21 for a second roller 22 serving as a deflecting element for the tension element 25 is arranged in the second bore section 16 of the further guide so as to be displaceable in the direction of the longitudinal axis of the second housing bore 13, 16.
  • the first carrier 11, 7 and the second carrier 17, 21 also have a rectangular cross section.
  • Each support 11, 7 or 17, 21 with associated deflection element (roller 8 and roller 22) forms a deflection device 11, 7, 8 or 17, 21, 22, respectively.
  • the two supports 11, 7 and 17.21 are designed as tubular bodies 11 and 17 and each have a fork-shaped part 7 and 21 at their end region protruding from the associated bore section 13 and 16, respectively.
  • the fork-shaped part 7 of the first carrier 11, 7 has an axis 9 running transversely to the longitudinal axis of the first carrier 11, 7, on which the first roller 8 is rotatably mounted.
  • the fork-shaped part 21 of the second carrier 17, 21 also has an axis 23 which runs transversely to the longitudinal axis of the second carrier 17, 21 and on which the second roller 22 is rotatably mounted.
  • a first spring 4 is arranged in the tubular body 11 of the first carrier 11, 7, the axial extension of which is greater than the axial extension of the tubular body 11 of the first carrier 11, 7.
  • the first spring 4 is supported at one end by the insert 15 in the further housing bore 13, 16 and acts with its other end on a wall 6 delimiting the tubular body, to which the fork-shaped part 7 of the first carrier 11, 7 connects.
  • a second spring 18 is arranged in the tubular body 17 of the second carrier 17, 21, the axial extension of which is greater than the axial extension of the tubular body 17 of the second carrier 17, 21.
  • the one end of the second spring 18 is supported on the insert 15 in the further housing bore 13, 16 and acts with its other end on a wall 20 delimiting the tubular body, to which the fork-shaped part 21 of the second carrier 17, 21 connects.
  • the first carrier 11, 7 carrying the first roller 8 is loaded in the direction of the longitudinal axis of the cylinder housing 1 in the direction away from the cylinder housing 1.
  • the second carrier 17, 21 carrying the second roller 22 is loaded in the direction of the longitudinal axis of the cylinder housing 1 in the direction away from the cylinder housing 1.
  • the tension element 25 which connects the piston 31 to the driver 14 and is guided over the two rollers 8 and 22, is kept constantly under tension.
  • the first carrier 11, 7 has a stop 5 on its outer lateral surface, which can be brought into contact with the associated end face of the cylinder housing 1 when the first carrier 11, 7 moves in the direction of the cylinder housing 1 and so limits the stroke of the first carrier 11, 7 in the direction of the cylinder housing 1.
  • the second carrier outside of the further housing bore 13, 16 has a stop 19 on its outer lateral surface, which stops when the second carrier 17, 21 moves in the direction of the cylinder the housing 1 can be brought into contact with the associated end face of the cylinder housing 1 and thus limits the stroke of the second carrier 17, 21 in the direction of the cylinder housing 1.
  • a first cap-like cover 10 and a second cap-like cover 24 are attached to the two ends of the cylinder housing 1, which enclose the carriers provided with the rollers 8 and 22 together with the cylinder housing 1 and thus protect these components from contamination.
  • the tension element 25 which partially wraps around the rollers 8 and 22 and the stops 5 and 19 on the carriers 11, 7 and 17, 21 limit the stroke of the carriers 11, 7 and 17, 21 carrying the rollers 8 and 22 in the direction away from the cylinder housing 1 or towards the cylinder housing 1.
  • FIG. 2 shows the cylinder housing 1 with the first housing bore 34 with piston 31, the first bore section 13 with the tubular body 11 of the first carrier 11, and the driver 14 in section along the line A-A according to FIG. It can be clearly seen from this figure that the first housing bore 34, the further housing bores 13, 16 serving as further guidance and the driver 14 are arranged one above the other on a common vertical axis.
  • the further housing bores 13, 16 can be designed as a single through-bore which has an insert 15 serving as a support for both springs 4 and 18 or also two inserts, each insert then being assigned to a spring 4 or 18.
  • two individual bores designed in the manner of a blind bore can also be provided for the supports.
  • an insert can be dispensed with, since the bottom of each blind bore would serve as spring support for the associated spring 4 or 18.
  • the bore or the bores can have a circular cross section, but also any cross section deviating from the circular shape.
  • the further housing bore 13, 16 or the further housing bores for the supports 11, 7 and 17, 21 can also be arranged in the cylinder housing 1 in a slightly oblique manner with respect to the longitudinal axis of the cylinder housing 1.
  • each carrier that carries the roller can be configured cranked.
  • Each support carrying a role can at least partially consist of a tubular body which can serve to receive the associated tension spring for supports with a role.
  • the carrier can also consist of solid material, so that the spring acts on the end face of the carrier facing the further housing bore.
  • each carrier is designed so that it is securely guided in the associated further housing bore.
  • the carrier is designed such that it is adapted to the cross-sectional shape of the further housing bore.
  • Additional stops 5 and 19 to be arranged on the supports 11, 7 and 17, 21 can be dispensed with if the length of the supports 11, 7 or 17, 21 is dimensioned such that the supports 11, 7 or 17, 21 with their end faces located in the further housing bores 13, 16 on the insert 15 or on the inserts or on the bottom of the blind bores come into contact when the carrier (s) 11, 7 or 17, 21 has a predeterminable stroke in the direction of the Have cylinder housing 1 to run.
  • Each spring 4 or 18 itself can also serve as a stop if it is in a fully compressed state (turn to turn) or if the spring is designed to be very strong.
  • the supports 11, 7 and 17, 21 with the rollers 8, 22 are then guided by the tension element 25 against the force of the springs 4 and 18 in the further guidance (Housing bores 13, 16) held that they abut with their stops 5 and 19 on the associated end faces of the cylinder housing 1.
  • the tension element 25 is loaded with tension on its side which partially wraps around the second roller 22, since via the pulling element 25, the driver 14 is moved (pulled) from the piston 31 to the right, in the direction of the second cover 24.
  • the part of the tension element 25 which partially wraps around the first roller 8 (part between the driver 14, the first roller 8 and the piston 31) is relieved in this process, a slight play between the first roller 8 and the tension element 25 being produced.
  • the first carrier 11, 7 Due to the force occurring on the tension element 25, the first carrier 11, 7 is pushed into the further housing bore 13, 16 against the force of the spring 4, namely until the stop 5 of the first carrier 11, 7 on the associated end face of the cylinder housing 1 comes to the plant.
  • the force of the second spring 18 acting on the second carrier 17, 21 displaces the second carrier 17, 21 away from the associated end face of the cylinder housing 1, the stop 19 being released from this end face of the cylinder housing 1.
  • the tension element 25 is held tensioned in the area between the driver 14, the second roller 22 and the piston 31.

Description

Die Erfindung betrifft einen druckmittelbetätigbaren Arbeitszylinder mit einem von einem Kolben über ein biegbares Zugelement angetriebenen Mitnehmer gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a pressure-actuated working cylinder with a driver driven by a piston via a flexible tension element according to the preamble of claim 1.

Ein derartiger Arbeitszylinder ist aus der DE-A-2 830 058 bekannt. Dieser bekannte Arbeitszylinder weist am Zylindergehäuse befestigte Führungsbleche für je eine ein als Umlenkelement für das Zugelement aufweisende Umlenkeinrichtung auf. Die Umlenkelemente sind als Umlenkrollen ausgebildet, wobei die Umlenkrollen im Bereich der Enden des Zylindergehäuses angeordnetsind. Jede Umlenkrolle ist auf einer quer zur Längsachse des Zyl indergehäuses verlaufend gelagerten und als Träger für die Umlenkrolle dienenden Achse angeordnet, die in einer parallel zur Längsachse des Führungsbleches verlaufenden schlitzförmigen Ausnehmung dieses Führungsbleches in Längsrichtung derschlitzförmigen Ausnehmung verschiebbar gelagert ist.Such a working cylinder is known from DE-A-2 830 058. This known working cylinder has guide plates attached to the cylinder housing, each for a deflection device having a deflection element for the tension element. The deflecting elements are designed as deflecting rollers, the deflecting rollers being arranged in the region of the ends of the cylinder housing. Each deflecting roller is arranged on an axis which runs transversely to the longitudinal axis of the cylinder and serves as a support for the deflecting roller and is slidably mounted in a slot-shaped recess of this guide plate which runs parallel to the longitudinal axis of the guide plate and is slidable in the longitudinal direction of the slot-shaped recess.

Es sind federbelastete Mittel vorgesehen, die sich am Führungsblech abstützen und die Achse in Richtung vom Zylinder weg belasten, so daß das Zugelement stets gespannt gehalten wird.Spring-loaded means are provided, which are supported on the guide plate and load the axis in the direction away from the cylinder, so that the tension element is always kept under tension.

Von Nachteil ist bei diesem Arbeitszylinder, daß bedingt durch die besondere Anordnung der Umlenkrollen am Arbeitszylinder dieser sehr sperrig in seinem Aufbau ist und für den Einbau eines solchen Arbeitszylinders relativ viel Raum benötigt wird.The disadvantage of this working cylinder is that due to the special arrangement of the deflection rollers on the working cylinder, this is very bulky in its construction and a relatively large amount of space is required for the installation of such a working cylinder.

Der Erfindung liegt die Aufgabe zugrunde, einen druckmittelbetätigbaren Arbeitszylinder der eingangs erwähnten Art zu schaffen, der kompakt in seinem Aufbau ist und bei welchem eine sichere Führung der Umlenkeinrichtung und damit des Zugelementes gewährleistet ist.The invention has for its object to provide a pressure-actuated working cylinder of the type mentioned, which is compact in its construction and in which a safe guidance of the deflection device and thus the tension element is guaranteed.

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 Anordnung von verschiebbar in einer zusätzlich im Zylindergehäuse vorgesehenen weiteren Gehäusebohrung geführten Trägern für die Umlenkelemente den Arbeitszylinder raumsparend ausbilden zu können.The invention offers in particular the advantage of being able to form the working cylinder in a space-saving manner by the arrangement of supports for the deflecting elements which are slidably guided in a further housing bore additionally provided in the cylinder housing.

Gemäß einer vorteilhaften Weiterbildung des Erfindungsgegenstandes ist jeder Träger wenigstens teilweise als ein rohrförmiger Körper ausgebildet, in welchen sich eine den Träger vom Zylindergehäuse weg beaufschlagende Feder hineinerstreckt. Durch diese Maßnahme wird der Platzbedarf für eine in ihrer axialen Erstreckung große Feder erheblich verringert.According to an advantageous development of the subject matter of the invention, each carrier is at least partially designed as a tubular body, into which a spring that acts on the carrier from the cylinder housing extends. This measure considerably reduces the space required for a spring with a large axial extension.

Weisen die weitere Gehäusebohrung und der Träger einen von der Kreisform abweichenden Querschnitt, z.B. einen rechteckigen Querschnitt, auf, so wird eine Verdrehsicherung für den Träger und somit auch für die Umlenkrolle erreicht, ohne daß zu diesem Zweck eine zusätzliche Verdrehsicherung vorgesehen werden muß. Es wird durch diese Verdrehsicherung eine sichere Führung des Zugelementes mittels des Umlenkelementes gewährleistet.If the further housing bore and the carrier have a cross-section deviating from the circular shape, e.g. a rectangular cross-section, an anti-rotation device for the carrier and thus also for the deflection roller is achieved without an additional anti-rotation device having to be provided for this purpose. This anti-rotation device ensures that the tension element is guided securely by means of the deflection element.

Weisen die zusätzliche Gehäusebohrung und die Träger für die Umlenkrollen einen kreisförmigen Querschnitt auf, so kann eine Verdrehsicherung dadurch erreicht werden, daß in der die Gehäusebohrung begrenzenden Wand eine in Längsrichtung der Gehäusebohrung verlaufende Nut vorgesehen wird, in die ein am Träger vorgesehener Vorsprung eingreift.If the additional housing bore and the carrier for the deflection rollers have a circular cross-section, an anti-rotation device can be achieved by providing a groove running in the longitudinal direction of the housing bore in the wall defining the housing bore, into which a projection provided on the carrier engages.

Es kann für beide Träger eine gemeinsame Gehäusebohrung vorgesehen werden, die durch einen Einsatz in zwei gleichachsige Gehäusebohrungsteile unterteilt ist.A common housing bore can be provided for both supports, which is divided into two coaxial housing bore parts by an insert.

Anhand der Zeichnung wird nachfolgend ein Ausführungsbeispiel der Erfindung näher erläutert.An exemplary embodiment of the invention is explained in more detail below with the aid of the drawing.

Es zeigen:

  • Fig.1 einen druckmittelbetätigbaren Arbeitszylinder mit zwei in einer Gehäusebohrung des Arbeitszylinders verschiebbar angeordneten, federbelasteten Trägern für die Umlenkrollen eines Zugelementes, mittels welchem ein Kolben mit einem Mitnehmer verbunden ist und
  • Fig.2 einen Schnitt durch den Arbeitszylinder gemäß Fig.1 nach der Linie A-A.
Show it:
  • 1 shows a pressure-actuated working cylinder with two spring-loaded supports for the deflecting rollers of a tension element, which are displaceably arranged in a housing bore of the working cylinder, by means of which a piston is connected to a driver and
  • 2 shows a section through the working cylinder according to Figure 1 along the line AA.

In Fig.1 ist ein druckmittelbetätigbarer Arbeitszylinder mit einem von einem Kolben über ein biegbares Zugelement angetriebenen Mitnehmer dargestellt.In Figure 1, a pressure-actuated working cylinder is shown with a driver driven by a piston via a bendable tension element.

Der Arbeitszylinder weist ein als Zylindergehäuse 1 dienendes Profilrohr mit einer in Richtung der Längsachse des Zylindergehäuses 1 verlaufenden ersten Gehäusebohrung 34 auf. Die erste Gehäusebohrung 34 kann einen kreisrunden Querschnitt, aber auch einen von der Kreisform abweichenden, z.B. einen ovalen Querschnitt haben. In der ersten Gehäusebohrung 34 ist ein Kolben 31 mittels Dichtringen 30 und 32 abgedichtet verschiebbar angeordnet. Die Querschnittsform des Kolbens 31 entspricht selbstverständlich der Querschnittsform der ersten Gehäusebohrung 34. Die erste Gehäusebohrung 34 ist an ihren beiden Enden von einem ersten Deckel 2 und einem zweiten Deckel 27 verschlossen.The working cylinder has a profiled tube serving as a cylinder housing 1 with a first housing bore 34 running in the direction of the longitudinal axis of the cylinder housing 1. The first housing bore 34 can have a circular cross section, but also a deviating from the circular shape, e.g. have an oval cross-section. In the first housing bore 34, a piston 31 is arranged such that it can be displaced in a sealed manner by means of sealing rings 30 and 32. The cross-sectional shape of the piston 31 naturally corresponds to the cross-sectional shape of the first housing bore 34. The first housing bore 34 is closed at both ends by a first cover 2 and a second cover 27.

Der Kolben 31 unterteilt den Zylinderraum in eine erste Arbeitskammer 33 und in eine zweite Arbeitskammer 29. Die erste Arbeitskammer 33 ist über einen Druckmittelanschluß 35 und die zweite Arbeitskammer 29 ist über einen zweiten Druckmittelanschluß 28 mit einer nicht dargestellten Ventileinrichtung verbunden, über welche die beiden Arbeitskammern 33 und 29 wahlweise mit einer Druckmittelquelle oder mit der Atmosphäre bzw. mit einem Rücklauf verbindbar sind.The piston 31 divides the cylinder space into a first working chamber 33 and a second working chamber 29. The first working chamber 33 is connected to a valve device (not shown) via a pressure medium connection 35 and the second working chamber 29 is connected via a second pressure medium connection 28 which the two working chambers 33 and 29 can be connected either to a pressure medium source or to the atmosphere or to a return.

Im ersten Deckel 2 ist ein ein Dichtelement 3 aufweisender Durchlaß und im zweiten Deckel 27 ist ein weiterer ein Dichtelement 26 aufweisender Durchlaß vorgesehen, durch welche ein mit dem Kolben 31 verbundenes Zugelement 25 abgedichtet aus den Stirnseiten des Zylinders herausgeführt ist.In the first cover 2 there is a passage having a sealing element 3 and in the second cover 27 there is another passage having a sealing element 26, through which a pulling element 25 connected to the piston 31 is sealed and led out of the end faces of the cylinder.

Im bzw. am Zylindergehäuse 1 ist eine erste Führung 12 für einen in Längsrichtung des Zylindergehäuses 1 geführten Mitnehmer 14 vorgesehen.A first guide 12 is provided in or on the cylinder housing 1 for a driver 14 guided in the longitudinal direction of the cylinder housing 1.

Das Zylindergehäuse 1 weist eine weitere Führung auf, die jeweils von einer weiteren Gehäusebohrung 13 bzw. 16 des Zylindergehäuses 1 gebildet wird, die in Richtung der Längsachse des Zylindergehäuses 1 verläuft. Die beiden weiteren Gehäusebohrungen 13, 16 weisen einen rechteckigen Querschnitt auf. Die beiden weiteren Gehäusebohrungen 13 bzw. 16 werden von einer das Zylindergehäuse 1 in Längsrichtung durchdringenden Bohrung gebildet, die durch einen in dieser Bohrung angeordneten Einsatz (15) in die zwei Gehäusebohrungen 13 bzw. 16 unterteilt ist. Die eine Gehäusebohrung 13 wird nachfolgend als erster Bohrungsabschnitt 13 und die andere Gehäusebohrung 16 wird nachfolgend als zweiter Bohrungsabschnitt 16 bezeichnet.The cylinder housing 1 has a further guide, which is formed in each case by a further housing bore 13 or 16 of the cylinder housing 1, which runs in the direction of the longitudinal axis of the cylinder housing 1. The two further housing bores 13, 16 have a rectangular cross section. The two further housing bores 13 and 16 are formed by a bore which penetrates the cylinder housing 1 in the longitudinal direction and is divided into the two housing bores 13 and 16 by an insert (15) arranged in this bore. One housing bore 13 is referred to below as the first bore section 13 and the other housing bore 16 is referred to below as the second bore section 16.

Die weitere Führung ist im Bereich zwischen der ersten Gehäusebohrung 34 und der im bzw. am Zylindergehäuse 1 vorgesehenen ersten Führung 12 für den Mitnehmer 14 angeordnet, der ebenfalls mit dem Zugelement 25 verbunden ist.The further guide is arranged in the area between the first housing bore 34 and the first guide 12 provided in or on the cylinder housing 1 for the driver 14, which is also connected to the tension element 25.

Die Längsachse der ersten Gehäusebohrung 34, die Längsachse der weiteren Führung 13, 16 und die Längsachse der ersten Führung 12 für den Mitnehmer 14 verlaufen parallel zueinander und parallel zur Längsachse des Zylindergehäuses 1.The longitudinal axis of the first housing bore 34, the longitudinal axis of the further guide 13, 16 and the longitudinal axis of the first guide 12 for the driver 14 run parallel to one another and parallel to the longitudinal axis of the cylinder housing 1.

Im ersten Bohrungsabschnitt 13 derweiteren Führung ist ein erster Träger 11, für eine als Umlenkelement für das Zugelement 25 dienende erste Rolle 8 in Richtung der Längsachse der zweiten Gehäusebohrung 13, 16 verschiebbar angeordnet. In gleicher Weise ist im zweiten Bohrungsabschnitt 16 der weiteren Führung ein zweiter Träger 17, 21 für eine als Umlenkelement für das Zugelement 25 dienende zweite Rolle 22 in Richtung der Längsachse der zweiten Gehäusebohrung 13, 16 verschiebbar angeordnet. Der erste Träger 11, 7 und der zweite Träger 17, 21 weisen ebenfalls einen rechteckigen Querschnitt auf. Jeder Träger 11, 7 bzw. 17, 21 mit zugehörigem Umlenkelement (Rolle 8 und Rolle 22) bildet je eine Umlenkeinrichtung 11, 7, 8 bzw. 17, 21, 22.In the first bore section 13 of the further guide there is a first carrier 11, for a first roller 8 serving as a deflecting element for the tension element 25, which can be displaced in the direction of the longitudinal axis of the second housing bore 13, 16. In the same way, a second support 17, 21 for a second roller 22 serving as a deflecting element for the tension element 25 is arranged in the second bore section 16 of the further guide so as to be displaceable in the direction of the longitudinal axis of the second housing bore 13, 16. The first carrier 11, 7 and the second carrier 17, 21 also have a rectangular cross section. Each support 11, 7 or 17, 21 with associated deflection element (roller 8 and roller 22) forms a deflection device 11, 7, 8 or 17, 21, 22, respectively.

Die beiden Träger 11, 7 und 17,21 sind als rohrförmige Körper 11 bzw. 17 ausgebildet und weisen an ihrem aus dem zugehörigen Bohrungsabschnitt 13 bzw. 16 herausragenden Endbereich je einen gabelförmig ausgebildeten Teil 7 bzw. 21 auf.The two supports 11, 7 and 17.21 are designed as tubular bodies 11 and 17 and each have a fork-shaped part 7 and 21 at their end region protruding from the associated bore section 13 and 16, respectively.

Der gabelförmige Teil 7 des ersten Trägers 11, 7 besitzt eine quer zur Längsachse des ersten Trägers 11, 7 verlaufende Achse 9, auf welcher die erste Rolle 8 drehbar gelagert ist. Der gabelförmige Teil 21 des zweiten Trägers 17, 21 besitzt ebenfalls eine quer zur Längsachse des zweiten Trägers 17, 21 verlaufende Achse 23, auf der die zweite Rolle 22 drehbar gelagert ist.The fork-shaped part 7 of the first carrier 11, 7 has an axis 9 running transversely to the longitudinal axis of the first carrier 11, 7, on which the first roller 8 is rotatably mounted. The fork-shaped part 21 of the second carrier 17, 21 also has an axis 23 which runs transversely to the longitudinal axis of the second carrier 17, 21 and on which the second roller 22 is rotatably mounted.

Im rohrförmigen Körper 11 des ersten Trägers 11, 7 ist eine erste Feder 4 angeordnet, deren axiale Erstreckung größer ist als die axiale Erstreckung des rohrförmigen Körpers 11 des ersten Trägers 11, 7. Die erste Feder 4 stützt sich mit ihrem einen Ende an dem Einsatz 15 in der weiteren Gehäusebohrung 13, 16 ab und beaufschlagt mit ihrem anderen Ende eine den rohrförmigen Körper begrenzende Wand 6, an die das gabelförmige Teil 7 des ersten Trägers 11, 7 anschließt.A first spring 4 is arranged in the tubular body 11 of the first carrier 11, 7, the axial extension of which is greater than the axial extension of the tubular body 11 of the first carrier 11, 7. The first spring 4 is supported at one end by the insert 15 in the further housing bore 13, 16 and acts with its other end on a wall 6 delimiting the tubular body, to which the fork-shaped part 7 of the first carrier 11, 7 connects.

Im rohrförmigen Körper 17 des zweiten Trägers 17, 21 ist eine zweite Feder 18 angeordnet, deren axiale Erstreckung größer ist als die axiale Erstreckung des rohrförmigen Körpers 17 des zweiten Trägers 17, 21. Die zweite Feder 18 stützt sich mit ihrem einen Ende an dem Einsatz 15 in der weiteren Gehäusebohrung 13, 16 ab und beaufschlagt mit ihrem anderen Ende eine den rohrförmigen Körper begrenzende Wand 20, an die das gabelförmige Teil 21 des zweiten Trägers 17, 21 anschließt.A second spring 18 is arranged in the tubular body 17 of the second carrier 17, 21, the axial extension of which is greater than the axial extension of the tubular body 17 of the second carrier 17, 21. The one end of the second spring 18 is supported on the insert 15 in the further housing bore 13, 16 and acts with its other end on a wall 20 delimiting the tubular body, to which the fork-shaped part 21 of the second carrier 17, 21 connects.

Mittels der Kraft der ersten Feder 4 wird der die erste Rolle 8 tragende erste Träger 11, 7 in Richtung der Längsachse des Zylindergehäuses 1 in Richtung vom Zylindergehäuse 1 weg belastet. Mittels der Kraft der zweiten Feder 18 wird der die zweite Rolle 22 tragende zweite Träger 17, 21 in Richtung der Längsachse des Zylindergehäuses 1 in Richtung vom Zylindergehäuse 1 weg belastet.By means of the force of the first spring 4, the first carrier 11, 7 carrying the first roller 8 is loaded in the direction of the longitudinal axis of the cylinder housing 1 in the direction away from the cylinder housing 1. By means of the force of the second spring 18, the second carrier 17, 21 carrying the second roller 22 is loaded in the direction of the longitudinal axis of the cylinder housing 1 in the direction away from the cylinder housing 1.

Durch die Beaufschlagung der beiden Umlenkeinrichtungen 11, 7, 8 und 17, 21, 22 mit den Federkräften wird das den Kolben 31 mit dem Mitnehmer 14 verbindende und über die beiden Rollen 8 und 22 geführte Zugelement 25 ständig gespannt gehalten.By acting on the two deflection devices 11, 7, 8 and 17, 21, 22 with the spring forces, the tension element 25, which connects the piston 31 to the driver 14 and is guided over the two rollers 8 and 22, is kept constantly under tension.

Der erste Träger 11, 7 weist außerhalb der weiteren Gehäusebohrung 13, 16 auf seiner äußeren Mantelfläche einen Anschlag 5 auf, der bei einer Bewegung des ersten Trägers 11, 7 in Richtung auf das Zylindergehäuse 1 zu an der zugeordneten Stirnseite des Zylindergehäuses 1 zur Anlage bringbar ist und so den Hub des ersten Trägers 11, 7 in Richtung auf das Zylindergehäuse 1 zu begrenzt.Outside of the further housing bore 13, 16, the first carrier 11, 7 has a stop 5 on its outer lateral surface, which can be brought into contact with the associated end face of the cylinder housing 1 when the first carrier 11, 7 moves in the direction of the cylinder housing 1 and so limits the stroke of the first carrier 11, 7 in the direction of the cylinder housing 1.

Ebenso weist der zweite Träger außerhalb der weiteren Gehäusebohrung 13,16 auf seiner äußeren Mantelfläche einen Anschlag 19 auf, der bei einer Bewegung des zweiten Trägers 17, 21 in Richtung auf das Zylindergehäuse 1 zu an der zugeordneten Stirnseite des Zylindergehäuses 1 zur Anlage bringbar ist und so den Hub des zweiten Trägers 17, 21 in Richtung auf das Zylindergehäuse 1 zu begrenzt.Likewise, the second carrier outside of the further housing bore 13, 16 has a stop 19 on its outer lateral surface, which stops when the second carrier 17, 21 moves in the direction of the cylinder the housing 1 can be brought into contact with the associated end face of the cylinder housing 1 and thus limits the stroke of the second carrier 17, 21 in the direction of the cylinder housing 1.

An die beiden Enden des Zylindergehäuses 1 sind ein erster kappenartiger Deckel 10 und ein zweiter kappenartiger Deckel 24 angesetzt, die die mit den Rollen 8 und 22 versehenen Träger zusammen mit dem Zylindergehäuse 1 einschließen und so diese Bauteile vor Verschmutzung schützen.A first cap-like cover 10 and a second cap-like cover 24 are attached to the two ends of the cylinder housing 1, which enclose the carriers provided with the rollers 8 and 22 together with the cylinder housing 1 and thus protect these components from contamination.

Das die Rollen 8 bzw. 22 teilweise umschlingende Zugelement 25 und die Anschläge 5 bzw. 19 an den Trägern 11, 7 und 17, 21 begrenzen den Hub der die Rollen 8 bzw. 22 tragenden Träger 11, 7 bzw. 17, 21 in Richtung vom Zylindergehäuse 1 weg bzw. in Richtung auf das Zylindergehäuse 1 zu.The tension element 25 which partially wraps around the rollers 8 and 22 and the stops 5 and 19 on the carriers 11, 7 and 17, 21 limit the stroke of the carriers 11, 7 and 17, 21 carrying the rollers 8 and 22 in the direction away from the cylinder housing 1 or towards the cylinder housing 1.

In Fig.2 sind das Zylindergehäuse 1 mit der ersten Gehäusebohrung 34 mit Kolben 31, dem ersten Bohrungsabschnitt 13 mit dem rohrförmigen Körper 11 des ersten Trägers 11, und der Mitnehmer 14 im Schnitt nach der Linie A-A gemäß Fig.1 dargestellt. Aus dieser Figur ist deutlich zu erkennen, daß die erste Gehäusebohrung 34, die als weitere Führung dienenden weiteren Gehäusebohrungen 13, 16 und der Mitnehmer 14 übereinander auf einer gemeinsamen Hochachse liegend angeordnet sind.2 shows the cylinder housing 1 with the first housing bore 34 with piston 31, the first bore section 13 with the tubular body 11 of the first carrier 11, and the driver 14 in section along the line A-A according to FIG. It can be clearly seen from this figure that the first housing bore 34, the further housing bores 13, 16 serving as further guidance and the driver 14 are arranged one above the other on a common vertical axis.

Die weiteren Gehäusebohrungen 13, 16 können als eine einzige Durchgangsbohrung ausgebildet sein, die einen als Abstützung für beide Federn 4 und 18 dienenden Einsatz 15 oder auch zwei Einsätze aufweist, wobei dann jeder Einsatz je einer Feder 4 bzw. 18 zugeordnet ist.The further housing bores 13, 16 can be designed as a single through-bore which has an insert 15 serving as a support for both springs 4 and 18 or also two inserts, each insert then being assigned to a spring 4 or 18.

Denkbar ist es natürlich auch, den Einsatz 15 wegzulassen so daß die beiden weiteren Gehäusebohrungen 13 und 16 gemeinsam eine Gehäusebohrung bilden und somit lediglich eine einzige Feder vorzusehen ist, die so angeordnet ist, daß sie mit ihren einander abgewandten Enden die einander zugewandten Seiten der beiden Träger 11, 7 und 17, 21 von den Stirnseiten des Zylindergehäuses 1 weg beaufschlagt.It is of course also conceivable to omit the insert 15 so that the two further housing bores 13 and 16 together form a housing bore and thus only a single spring is to be provided, which is arranged so that the mutually facing ends of the mutually facing sides of the two Carriers 11, 7 and 17, 21 acted away from the end faces of the cylinder housing 1.

Es können anstelle einer Durchgangsbohrung auch zwei einzelne, nach Art einer Sackbohrung ausgebildete Bohrungen für die Träger vorgesehen werden. In einem solchen Fall kann auf einen Einsatz verzichtet werden, da der Boden einer jeden Sackbohrung als Federabstützung für die zugeordnete Feder4 bzw. 18 dienen würde.Instead of a through bore, two individual bores designed in the manner of a blind bore can also be provided for the supports. In such a case, an insert can be dispensed with, since the bottom of each blind bore would serve as spring support for the associated spring 4 or 18.

Die Bohrung bzw. die Bohrungen können einen Kreisquerschnitt, aber auch jeden beliebigen von der Kreisform abweichenden Querschnitt aufweisen.The bore or the bores can have a circular cross section, but also any cross section deviating from the circular shape.

Wird ein Querschnitt gewählt, der von der Kreisform abweicht, so erübrigt sich eine zusätzliche Verdrehsicherung für die Träger 11, und 17, 21.If a cross section is chosen that deviates from the circular shape, there is no need for an additional anti-rotation device for the supports 11, and 17, 21.

Denkbar ist es auch, mehrere weitere Bohrungen zur Halterung und Führung von mehreren Trägern für Umlenkelemente im Zylindergehäuse vorzusehen.It is also conceivable to provide several further bores for holding and guiding several carriers for deflecting elements in the cylinder housing.

Die weitere Gehäusebohrung 13, 16 oder auch die weiteren Gehäusebohrungen für die Träger 11, 7 und 17, 21 können auch leicht schräg in Bezug auf die Längsachse des Zylindergehäuses 1 im Zylindergehäuse 1 angeordnet sein.The further housing bore 13, 16 or the further housing bores for the supports 11, 7 and 17, 21 can also be arranged in the cylinder housing 1 in a slightly oblique manner with respect to the longitudinal axis of the cylinder housing 1.

Der die Rolle tragende Endbereich eines jeden Trägers kann gekröpft ausgebildet sein.The end region of each carrier that carries the roller can be configured cranked.

Jeder eine Rolle tragende Träger kann wenigstens teilweise aus einem rohrförmigen Körper bestehen, welcher zur Aufnahme der zugehörigen Spannfeder für Träger mit Rolle dienen kann. Der Träger kann jedoch auch aus Vollmaterial bestehen, so daß die Feder die der weiteren Gehäusebohrung zugewandte Stirnfläche des Trägers beaufschlagt.Each support carrying a role can at least partially consist of a tubular body which can serve to receive the associated tension spring for supports with a role. However, the carrier can also consist of solid material, so that the spring acts on the end face of the carrier facing the further housing bore.

Selbstverständlich ist jeder Träger so ausgebildet, daß er in der zugehörigen weiteren Gehäusebohrung sicher geführt wird.Of course, each carrier is designed so that it is securely guided in the associated further housing bore.

Soll auf besondere Führungsmittel verzichtet werden, so wird der Träger so ausgebildet, daß er der Querschnittsform der weiteren Gehäusebohrung angepaßt ist.If special guide means are to be dispensed with, the carrier is designed such that it is adapted to the cross-sectional shape of the further housing bore.

Auf zusätzliche, an den Trägern 11, 7 und 17, 21 anzuordnende Anschläge 5 und 19 kann verzichtet werden, wenn die Länge der Träger 11, 7 bzw. 17, 21 so bemessen wird, daß die Träger 11, 7 bzw. 17, 21 mit ihren in den weiteren Gehäusebohrungen 13, 16 gelegenen Stirnflächen an dem Einsatz 15 bzw. an den Einsätzen oder an dem Boden der Sackbohrungen zur Anlage kommen, wenn der oder die Träger 11, 7 bzw. 17, 21 einen vorbestimmbaren Hub in Richtung auf das Zylindergehäuse 1 zu ausgeführt haben.Additional stops 5 and 19 to be arranged on the supports 11, 7 and 17, 21 can be dispensed with if the length of the supports 11, 7 or 17, 21 is dimensioned such that the supports 11, 7 or 17, 21 with their end faces located in the further housing bores 13, 16 on the insert 15 or on the inserts or on the bottom of the blind bores come into contact when the carrier (s) 11, 7 or 17, 21 has a predeterminable stroke in the direction of the Have cylinder housing 1 to run.

Als Anschlag kann auch jede Feder 4 bzw. 18 selbst dienen, wenn sie sich in vollständig zusammengedrücktem Zustand (Windung an Windung) befindet oder wenn die Feder sehr stark ausgelegt ist.Each spring 4 or 18 itself can also serve as a stop if it is in a fully compressed state (turn to turn) or if the spring is designed to be very strong.

Die Funktion des vorstehend beschriebenen Arbeitszylinders wird nachfolgend näher erläutert.The function of the working cylinder described above is explained in more detail below.

Sind die beiden Arbeitskammern 33 und 29 drucklos oder weisen gleich hohe Drücke auf, so werden die Träger 11, 7 und 17, 21 mit den Rollen 8, 22 mittels des Zugelementes 25 gegen die Kraft der Federn 4 bzw. 18 so in der weiteren Führung (Gehäusebohrungen 13, 16) gehalten, daß sie mit ihren Anschlägen 5 bzw. 19 an den zugeordneten Stirnseiten des Zylindergehäuses 1 anliegen.If the two working chambers 33 and 29 are depressurized or have the same high pressures, the supports 11, 7 and 17, 21 with the rollers 8, 22 are then guided by the tension element 25 against the force of the springs 4 and 18 in the further guidance (Housing bores 13, 16) held that they abut with their stops 5 and 19 on the associated end faces of the cylinder housing 1.

Wird beispielsweise die zweite Arbeitskammer 29 mit Druckmittel beaufschlagt und der Druck in der ersten Arbeitskammer 33 abgebaut, so wird der Kolben 31 in Richtung auf die erste Arbeitskammer 33 zu verschoben (Pfeil X).For example, if pressure medium is applied to the second working chamber 29 and the pressure in the first working chamber 33 is reduced, the piston 31 is displaced in the direction of the first working chamber 33 (arrow X).

Das Zugelement 25 wird auf seiner die zweite Rolle 22 teilweise umschlingenden Seite mit Zug belastet, da über das Zugelement 25 der Mitnehmer 14 vom Kolben 31 nach rechts, in Richtung auf den zweiten Deckel 24 zu bewegt wird (gezogen wird).The tension element 25 is loaded with tension on its side which partially wraps around the second roller 22, since via the pulling element 25, the driver 14 is moved (pulled) from the piston 31 to the right, in the direction of the second cover 24.

Der die erste Rolle 8 teilweise umschlingende Teil des Zugelementes 25 (Teil zwischen Mitnehmer 14, erster Rolle 8 und Kolben 31) wird bei diesem Vorgang entlastet, wobei ein geringes Spiel zwischen der ersten Rolle 8 und dem Zugelement 25 entstehen würde.The part of the tension element 25 which partially wraps around the first roller 8 (part between the driver 14, the first roller 8 and the piston 31) is relieved in this process, a slight play between the first roller 8 and the tension element 25 being produced.

Da jedoch der die erste Rolle 8 tragende Träger 11, 7 durch die Kraft der Feder 4 nach links, von der zugehörigen Stirnseite des Zylindergehäuses 1 weg, verschoben wird, wobei sich der Anschlag 5 des ersten Trägers 11, 7 von dieser Stirnseite des Zylindergehäuses 1 löst (wie in Fig.1 dargestellt) wird das Zugelement 25 weiter gespannt gehalten.However, since the carrier 11, 7 carrying the first roller 8 is displaced to the left by the force of the spring 4, away from the associated end face of the cylinder housing 1, the stop 5 of the first carrier 11, 7 moving away from this end face of the cylinder housing 1 releases (as shown in Fig.1), the tension element 25 is kept tensioned.

In gleicher Weise wird bei einer Bewegung des Kolbens 31 in Richtung auf die zweite Arbeitskammer 29 zu und bei einer daraus resultierenden Bewegung des Mitnehmers 14 nach links, in Richtung auf den ersten Deckel 10 zu, der die erste Rolle 8 teilweise umschlingende Bereich des Zugelementes 25 (Bereich zwischen Mitnehmer 14, erster Rolle 8 und Kolben 31 mit Zug belastet.In the same way, when the piston 31 moves in the direction of the second working chamber 29 and, when the driver 14 moves to the left, in the direction of the first cover 10, the region of the tension element 25 which partially wraps around the first roller 8 becomes (Area between driver 14, first roller 8 and piston 31 loaded with train.

Der die zweite Rolle 22 teilweise umschlingende Bereich des Zugelementes 25 (Bereich zwischen Mitnehmer 14, zweiter Rolle 22 und Kolben 31) wird entlastet.The area of the tension element 25 that partially wraps around the second roller 22 (area between driver 14, second roller 22 and piston 31) is relieved.

Durch die am Zugelement 25 auftretende Kraft wird der erste Träger 11, 7 gegen die Kraft der Feder 4 in die weitere Gehäusebohrung 13, 16 eingeschoben, und zwar soweit, bis der Anschlag 5 des ersten Trägers 11, 7 an der zugehörigen Stirnseite des Zylindergehäuses 1 zur Anlage kommt.Due to the force occurring on the tension element 25, the first carrier 11, 7 is pushed into the further housing bore 13, 16 against the force of the spring 4, namely until the stop 5 of the first carrier 11, 7 on the associated end face of the cylinder housing 1 comes to the plant.

Die auf dem zweiten Träger 17, 21 einwirkende Kraft der zweiten Feder 18 verschiebt den zweiten Träger 17, 21 von der zugehörigen Stirnseite des Zylindergehäuses 1 weg, wobei sich der Anschlag 19 von dieser Stirnseite des Zylindergehäuses 1 löst. Über die mit dem zweiten Träger 17, 21 verbundene zweite Rolle 22 wird das Zugelement 25 im Bereich zwischen dem Mitnehmer 14, der zweiten Rolle 22 und dem Kolben 31 gespannt gehalten.The force of the second spring 18 acting on the second carrier 17, 21 displaces the second carrier 17, 21 away from the associated end face of the cylinder housing 1, the stop 19 being released from this end face of the cylinder housing 1. Via the second roller 22 connected to the second carrier 17, 21, the tension element 25 is held tensioned in the area between the driver 14, the second roller 22 and the piston 31.

Claims (13)

1. Working cylinder able to be actuated by a pressure medium, with an entrainment member (14) driven by a piston (31) by way of a flexible pulling member (25), having the following features:
a) the piston (31) is guided in a first housing bore (31) provided in a cylinder housing (1) and extending in the longitudinal direction of the cylinder housing (1);
b) the entrainment member (14) is guided in a first guide (12) in the longitudinal direction of the cylinder housing (1);
c) disposed at the ends of the cylinder housing (1) are reversing devices for the pulling member (25), consisting respectively of a reversing member (8 or 22) and a support (11, 7 or 17, 21);
d) the reversing devices are respectively guided to slide in a further guide (13,16) and acted upon by spring forces so that the pulling member (25) is permanently tensioned;
characterised in that the further guide is in each case formed by a further housing bore (13 or 16) in the cylinder housing (1), which serves for receiving at least one part of the support (11, 7 or 17, 21) of the respective reversing device.
2. Working cylinder able to be actuated by a pressure medium according to Claim 1, characterised in that the spring forces act on the reversing devices substantially in the direction of the longitudinal axis of the cylinder housing.
3. Working cylinder able to be actuated by a pressure medium according to at least one of the preceding Claims, characterised in that the spring forces are in each case applied by a spring (4 or 18), which is disposed in the further housing bore (13 or 16) and is supported on one side on the cylinder housing (1) and on the other side on the support (11, 7 or 17, 21).
4. Working cylinder able to be actuated by a pressure medium according to at least one of the preceding Claims, characterised in that the spring forces for both reversing devices are applied by a common spring, which is disposed in a common housing bore (13,16) forming both further housing bores (13 or 16) and is supported on the two supports (11, 7 or 17, 21) of the reversing devices.
5. Working cylinder able to be actuated by a pressure medium according to Claim 3, characterised by the following features:
a) each support (11, 7 or 17, 21) is at least partly constructed as a tubular member (11 or 17);
b) each spring (1 or 18) extends into the associated tubular member (11 or 17);
c) each spring (4 or 18) is so dimensioned in the direction of its axial extent that it projects from the associated tubular member (11 or 17), in which case it is supported by one end against an insert (15) disposed in the further housing bore (13, 16) and acts on the associated tubular member (11 or 17) in the direction away from the cylinder housing (1).
6. Working cylinder able to be actuated by a pressure medium according to Claim 4, characterised by the following features:
a) each support (11, 7 or 17, 21) is constructed at least partly as a tubular member (11 or 17);
b) the common spring for actuating both reversing devices is disposed in the further housing bore (13, 16) and extends with its sides remote from each other into the tubular members (11 or 17) of the reversing devices;
c) the spring is so dimensioned in its axial extent that it acts on the two supports (11, 7 or 17, 21) in the direction away from the ends of the cylinder housing (1) facing away from each other.
7. Working cylinder able to be actuated by a pressure medium according to at least one of the preceding Claims, characterised in that the further housing bores (13 or 16) and each support (11, 7 or 17, 21) have a cross-section which varies from a circular shape.
8. Working cylinder able to be actuated by a pressure medium according to at least one of the preceding Claims, characterised in that the further housing bores (13 or 16) and each support (11, 7 or 17, 21) have a rectangular cross-section.
9. Working cylinder able to be actuated by a pressure medium according to at least one of the preceding Claims, characterised in that provided for each support (11, 7 or 17, 21) is a stop (5 to 19), by means of which one stroke of the support (11, 7 or 17, 21) is limited in the direction towards the cylinder housing (1).
10. Working cylinder able to actuated by a pressure medium according to Claim 9, characterised in that the stop (5 or 19) of each support (11, 7 or 17, 21) is disposed outside the further housing bores (13 or 16) on the surface of the associated support (11, 7 or 17, 21).
11. Working cylinder able to be actuated by a pressure medium according to at least one of the preceding Claims, characterised in that the reversing member consists of a roller (8 or22) mounted to rotate on the support (11, 7 or 17, 21).
12. Working cylinder able to be actuated by a pressure medium according to at least one of the preceding Claims, characterised in that provided on the outer surface of each support (11, 7 or 17, 21) is an outwardly extending projection, which projects into a recess located in the surface defining the further housing bores (13 or 16), which recess extends in the longitudinal direction of the further housing bores (13 or 16).
13. Working cylinder able to be actuated by a pressure medium according to at least one of Claims 1 to 4 and 7 to 12, characterised by the following features:
a) each support (11, 7 or 17, 21) consists of solid material;
b) the side of each support (11, 7 or 17,21) remote from the associated reversing member (8 or 22) is acted upon in the direction of the longitudinal axis of the support (11, or 17, 21) by the spring (4 or 18) associated with this support (11, 7 or 17, 21).
EP90101128A 1989-03-22 1990-01-20 Pressure-fluid actuator Expired - Lifetime EP0388586B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3909344 1989-03-22
DE3909344A DE3909344A1 (en) 1989-03-22 1989-03-22 PRESSURE-OPERABLE WORKING CYLINDER

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Publication Number Publication Date
EP0388586A1 EP0388586A1 (en) 1990-09-26
EP0388586B1 true EP0388586B1 (en) 1992-04-01
EP0388586B2 EP0388586B2 (en) 1996-10-09

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EP (1) EP0388586B2 (en)
JP (1) JPH02275102A (en)
DE (2) DE3909344A1 (en)

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Also Published As

Publication number Publication date
EP0388586A1 (en) 1990-09-26
EP0388586B2 (en) 1996-10-09
JPH02275102A (en) 1990-11-09
US5022311A (en) 1991-06-11
DE59000074D1 (en) 1992-05-07
DE3909344A1 (en) 1990-09-27

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