EP0060412B1 - End-of-stroke cushioning device for a piston of a double-acting cylinder - Google Patents

End-of-stroke cushioning device for a piston of a double-acting cylinder Download PDF

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Publication number
EP0060412B1
EP0060412B1 EP82101329A EP82101329A EP0060412B1 EP 0060412 B1 EP0060412 B1 EP 0060412B1 EP 82101329 A EP82101329 A EP 82101329A EP 82101329 A EP82101329 A EP 82101329A EP 0060412 B1 EP0060412 B1 EP 0060412B1
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EP
European Patent Office
Prior art keywords
pressure
valve
medium
return valve
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
Application number
EP82101329A
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German (de)
French (fr)
Other versions
EP0060412A1 (en
Inventor
Axel Kemner
Helmut Göttling
Rolf Heise
Werner Dannenberg
Hans-Jürgen Pfeifer
Wolf-Dietrich Kamke
Walter Ortmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wabco Westinghouse Steuerungstechnik and Co GmbH
Original Assignee
Wabco Westinghouse Steuerungstechnik and Co GmbH
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Application filed by Wabco Westinghouse Steuerungstechnik and Co GmbH filed Critical Wabco Westinghouse Steuerungstechnik and Co GmbH
Priority to AT82101329T priority Critical patent/ATE13215T1/en
Publication of EP0060412A1 publication Critical patent/EP0060412A1/en
Application granted granted Critical
Publication of EP0060412B1 publication Critical patent/EP0060412B1/en
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/22—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke
    • F15B15/225—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke with valve stems operated by contact with the piston end face or with the cylinder wall
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/22—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke

Definitions

  • the invention relates to a device for the end braking of the working piston of a double-acting working cylinder according to the preamble of claim 1.
  • Such double-acting working cylinders with end braking are used wherever it is necessary to first transmit a rapid movement in two directions and then to slow the movement relatively slowly. This is e.g. B. required for automatic door locking devices.
  • a known device of the type mentioned above (door cylinder 422 802 Europe catalog from WABCOissemsen GmbH) is constructed in such a way that each chamber of the double-acting working cylinder is continuously connected to a pressure medium connection via a throttled passage and via a stroke-controlled valve with relative Large cross section can be connected to the pressure medium connection.
  • the valve is designed and arranged such that it is automatically closed when a predetermined position of the working piston is reached, so that the chamber to be vented is then only vented via the throttled passage.
  • the stepwise ventilation described is carried out in the chamber on the piston rod side in that the piston rod is stepped and the thicker part of the piston rod facing the piston forms the desired valve for blocking the ventilation of the large cross section from the chamber on the piston rod side with an annular seal arranged in an intermediate wall of the cylinder .
  • the ring seal has a sealing lip which enables the ventilation of the chamber on the piston rod side and which bears sealingly against the thicker part of the piston rod during the ventilation.
  • a magnetically actuated valve device which, arranged on a double-acting working cylinder, serves for venting the chamber of the working cylinder acted upon by the pressure medium when the working piston approaches its end position.
  • this known valve device one cannot Avoid largely usable extension of the working cylinder.
  • a disadvantage of this valve device is that the valve switching magnet must be moved mechanically from the working piston towards the valve closure member.
  • the path that the piston is to travel at a reduced speed in order to prevent the piston from hitting the cylinder cover hard can be dimensioned only very briefly. In the case of large working cylinders whose pistons have a relatively large mass to be accelerated or decelerated, this short distance is often not sufficient to effectively reduce the piston speed.
  • the invention is therefore based on the object to provide a device of the type mentioned, in which the described, not usable for the use of the working piston and thus the piston rod extension of the cylinder is avoided with simple means and which a safe and sufficient reduction in speed of the piston before reaching its end position.
  • the device according to the invention is characterized in addition to the compact and short construction of the working cylinder in that both the compressed air to be controlled into the pressure medium chambers and the compressed air flowing out of the pressure medium chambers are used for switching the valves, which enables the use of small switching and holding magnets.
  • the piston rod 1, 36 is arranged in the end wall, which closes the first pressure medium chamber 19, and is provided with a sealing element 37 lead out of the working cylinder.
  • a sealing ring 20 arranged on the circumference of the working piston 21 seals the first pressure medium chamber 1 against the second pressure medium chamber 22.
  • the piston rod 1, 36 is divided into a non-magnetizable part 36 and a magnetizable part 1 in a ratio of approximately 1: 3.
  • the cylinder has two pressure medium connections 13 and 23 via an unshown multi-port valve with egg - can be brought ner pressure fluid source in communication.
  • the pressure medium connection 13 is part of a quick exhaust valve, which has a sealing seat 12, an outlet seat 9 and a cantilevered valve closure member 11.
  • the connection 23 is also part of a quick exhaust valve, which has a sealing seat 24, an outlet seat 26 and a cantilevered valve closure member 25.
  • Both quick exhaust valves 19, 11, 12 and 24, 25, 26 each have a pressure medium outlet 7 and 27 leading to the atmosphere.
  • the quick-exhaust valve 9, 11, 12 provided with the connection 13 is followed by a check valve integrated in the working cylinder housing, which comprises a valve seat 14, a valve closure body 15 and a valve closure body 15, which is supported on a housing shoulder 2, in the direction of the valve seat 14 compression spring 18 to be acted upon.
  • a permanent magnet 17 is firmly connected to the valve closure body 15. The stroke of the valve closure member 15 and thus also of the permanent magnet 17 is limited in the direction of the open position by a stop 3 provided in the valve housing, on which a disk 5 fixedly connected to the valve closure member 15 is placed. Passages 4 are provided in the disk 5, via which the first pressure medium chamber 19 is continuously connected to a throttle bore 8 serving as a bypass.
  • the throttle bore 8 leads to the outlet 7 of the quick exhaust valve 9, 11, 12.
  • the cross section of the throttle bore 8 can be changed by means of an adjusting screw 6.
  • the piston rod part 36 has an axially extending bore 34 which penetrates the working piston 21 and which cooperates in a plug-like manner with a mandrel 32 arranged on the end face which closes the second pressure medium chamber 22 of the working cylinder.
  • the mandrel 32 has a bore 33 running in the longitudinal direction, via which the second pressure medium chamber 22 can be connected to a channel 28 and further to the pressure medium outlet 27 of the quick exhaust valve 24, 25, 26 leading to the atmosphere.
  • a throttle bore 29 establishes a permanent connection between the second pressure medium chamber 22 and the pressure medium outlet 27.
  • the cross section of the throttle bore 29 can be changed by means of an adjusting screw 30.
  • the working cylinder has a fastening eyelet 31 on its right end.
  • first pressure medium chamber 19 of the working cylinder is vented and the second pressure medium chamber 22 of the working cylinder is vented, so that the working piston 21 is in its right end position.
  • the mandrel 32 is received in this end position of the working piston 21 by the bore 34 arranged in the non-magnetizable part 36 of the piston rod.
  • Pressure medium is present at the connection 13 of the quick exhaust valve 9, 11, 12 belonging to the first pressure medium chamber 19 and in the first pressure medium chamber 19.
  • the valve closure member 11 of the quick exhaust valve 9, 11, 12 is held by the pressure medium at the connection 13 on the outlet seat 9, so that the pressure medium cannot escape from the first pressure medium chamber 19 via the pressure medium outlet 7.
  • valve closure member 15 of the check valve 14, 15, 18 is displaced in the direction of the stop 3 when the first pressure medium chamber 19 is ventilated by the force of the pressure medium against the force of the compression spring 18, and the check valve 14, 15, 18 has thus been brought into the open position .
  • the valve closure member 15 connected to the permanent magnet 17 is held in this position by the force of the pressure medium.
  • An additional holding force is generated by the magnetic field, which has built up around the magnetizable part 1 of the piston rod and the permanent magnet 17.
  • the valve also not shown, which is arranged between the pressure medium source (not shown) and the connections 13, 23 is switched over.
  • the second pressure medium chamber 22 is vented.
  • the pressure medium line leading to connection 13 is vented.
  • the pressure medium located in the first pressure medium chamber 19 is pressed out of the first pressure medium chamber 19 via the open check valve 14, 15, 18, the throttle bore 8, the passage 10 and the pressure medium outlet 7 .
  • the pressure medium flowing through the passage 10 causes the valve closure body 11 to rest on the sealing seat 12 of the quick exhaust valve.
  • the pressure medium connection 13 is now closed and the pressure medium outlet 7 is open. Through the opened check valve 14, 15, 18 and the passage 10, the pressure medium escapes quickly from the first pressure medium chamber 19 to the atmosphere.
  • the check valve 14, 15, 18 is held in the open position as long as the magnetizable part 1 of the piston rod 1, 36 is in the region of the permanent magnet 17 connected to the valve closure body 15.
  • connection 13 of the quick exhaust valve 9, 11, 12 is connected to the pressure medium source and the pressure medium supply to the connection 23 of the quick exhaust valve 24, 25, 26 belonging to the second pressure medium chamber 22 is blocked.
  • valve closure member 11 of the quick exhaust valve 9, 11, 12 Due to the force of the pressure medium, the valve closure member 11 of the quick exhaust valve 9, 11, 12 is lifted off the sealing seat 12 and pressed against the outlet seat 9.
  • the pressure medium flowing through the quick exhaust valve 9, 11, 12 into the passage 10 acts on the surface of the valve closure member 15 of the check valve 14, 15, 18 facing the quick exhaust valve 9, 11, 12 and displaces the valve closure member 15 and thus the permanent magnet 17 against the force of the Compression spring 18 in the direction of the stop 3.
  • pressure medium enters the first pressure medium chamber 19, as a result of which the working piston 21 is displaced in the direction of the second pressure medium chamber 22.
  • the pressure in the second pressure medium chamber 22 is first quickly reduced via the bore 33 provided in the mandrel 32 and the throttle bore 29 and the pressure medium outlet 27. As soon as the mandrel 32 is received by the bore 34 provided in the sealing element 35 and arranged in the working piston 21 and in the piston rod part 36, the pressure medium can only escape from the second pressure medium chamber 22 via the throttle bore 29. Consequently, the working piston 21 now slows down to its right end position.
  • the check valve 14, 15, 18 assigned to the first pressure medium chamber 19 remains open since the magnetizable part 1 of the piston rod 1, 36 is located in the area of the permanent magnet 17.
  • the piston rod 38 is led out of the working cylinder through a piston rod bushing provided with an annular seal 39.
  • the working piston 66 has a circumferential seal 68, by means of which the two pressure medium chambers 71, 65 are separated from one another in a pressure-tight manner.
  • a check valve is attached, which he has a valve seat 47 and a p by a compression spring 43 toward the valve seat 47 to applied Ventilver- schlußkör 46th
  • An iron core 42 firmly connected to the valve closure body 46 is slidably mounted in an annular first permanent magnet 41, which is arranged in the valve housing.
  • the check valve 47, 46, 43 is connected on the one hand via a pressure medium line 40 to the first pressure medium chamber 71 of the working cylinder and on the other hand via a channel 48 to a first quick exhaust valve which has a pressure medium connection 52, a sealing seat 51, an outlet seat 49 and a pressure medium outlet leading to the atmosphere 53 and a cantilevered valve closure body 50.
  • a throttle bore 45 is arranged in the valve housing between the pressure medium line 40 leading from the first pressure medium chamber 71 of the working cylinder to the check valve 46, 47, 43 and the channel 48 leading from the check valve 47, 46, 43 to the quick exhaust valve 49, 50, 51.
  • the cross section of the throttle bore 45 can be changed by means of an adjusting screw 44.
  • the pressure medium connection 52 of the quick exhaust valve 49, 50, 51 can be connected to a pressure medium source via a switch valve (not shown).
  • a second quick exhaust valve which is firmly connected to the working cylinder, can also be connected to the pressure medium source via a pressure medium connection 54 and the changeover valve.
  • the second quick exhaust valve has a sealing seat 55, an outlet seat 57, a cantilevered valve closure member 56 and a pressure medium outlet 58 leading to the atmosphere.
  • the quick exhaust valve 55, 56, 57 is connected to the second pressure medium chamber 65 of the working cylinder via a channel 59 and a bore 63 provided in a mandrel 64.
  • the mandrel 64 is on the end face of the work delimiting the second pressure medium chamber 65 firmly arranged cylinder and forms a valve together with a bore 70 penetrating the working piston 66 in the axial direction and extending a bit into the piston rod 38.
  • the bore 70 is enclosed in the area of the end face of the working piston 66 by a sealing ring 67.
  • a throttle bore 61 arranged in the end wall of the working cylinder delimiting the second pressure medium chamber 65 connects the second pressure medium chamber 65 to the channel 59 leading to the quick exhaust valve 55, 56, 57.
  • the cross section of the throttle bore 61 can be changed by means of an adjusting screw 62.
  • a second annular permanent magnet 69 is arranged on the piston rod 38 in the vicinity of the working piston 66.
  • a holder 60 is provided on the right end face of the working cylinder.
  • the second pressure medium chamber 65 is vented and the first pressure medium chamber 71 is vented.
  • the valve closure body 46 of the check valve 46, 47, 43 together with the iron core 42 has been displaced from the pressure medium in the direction of the working cylinder housing and the check valve 46, 47, 43 has thus been opened.
  • the permanent magnet 41 is arranged and designed so that it holds the iron core 42 with the valve closure body 46 against the force of the compression spring 43 in the position lifted from the valve seat 47.
  • the pressure medium supply to the pressure medium connection 52 of the quick exhaust valve 49, 50, 51 assigned to the first pressure medium chamber 71 is interrupted and via the quick exhaust valve 55 assigned to the second pressure medium chamber 65 , 56, 57, the channel 59 and the bore 61 or 63 pressure medium introduced into the second pressure medium chamber 65.
  • the pressure medium emerging from the first pressure medium chamber 71 shifts the valve closure body 50 in the direction of the sealing seat 51.
  • the pressure in the first pressure medium chamber 71 is initially quickly reduced.
  • the second permanent magnet 69 arranged on the piston rod 38 has reached the effective range of the first permanent magnet 41 arranged in the valve housing by the displacement of the working piston 66, the second permanent magnet 69 cancels the force of the first permanent magnet 41 (the first and second permanent magnets are arranged with opposite polarity to one another ).
  • valve closure member 46 By the force of the compression spring 43, the valve closure member 46 is pressed against the valve seat 47, so that the check valve 46, 47, 43 is closed again.
  • the pressure medium can now only reach the pressure medium outlet 53 via the throttle bore 45.
  • the pressure medium connection 52 of the first quick exhaust valve 49, 50, 51 is connected to the pressure medium source and the pressure medium supply to the pressure medium connection 54 of the quick ventilation valve 55, 56, 57 assigned to the second pressure medium chamber 65 is blocked.
  • Pressure medium flows through the first quick exhaust valve 49, 50, 51, the check valve 46, 47, 43 and the pressure medium line 40 into the first pressure medium chamber 71 of the working cylinder and displaces the working piston 66 in the direction of the second pressure medium chamber 65.
  • the pressure in the second pressure medium chamber 65 is first rapidly reduced via the bore 63 provided in the mandrel 64, the throttle bore 61, the channel 59 and the pressure medium outlet 58.
  • the mandrel 64 is received by the bore 70 provided with the sealing element 67 and arranged in the working piston 66 and in the piston rod 38, the pressure medium can only escape from the second pressure medium chamber 65 via the throttle bore 61.
  • the working piston 66 now slows down to its right end position.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Braking Arrangements (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

1. Device for braking the final part of the stroke of the working piston (21) of a double-action working cylinder, which piston is provided with a piston rod (1, 36), having the following features : a) one of the pressure-medium chambers (19) of the working cylinder is connected via a non-return valve (15, 14) to the associated pressure-medium connection (13) for the input and output of the pressure medium, the non-return valve (15, 14) being arranged in such a manner that it can be brought into the open position in the direction towards the pressure-medium chamber (19) ; b) the pressure-medium chamber (19) is additionally connected directly to the pressure-medium connection (13) via a bore (8) provided with a restriction (6) ; c) the non-return valve (15, 14) is arranged and designed in such a manner that, when the pressure medium is output from the pressure-medium chamber (19), initially the non-return valve (14, 15) is opened and, after a predetermined position of the working cylinder (21) has been reached, before the end of the stroke, the non-return valve (14, 15) is closed in order that the pressure medium displaced by the working piston (21) can initially flow substantially unhindered out through the open non-return valve (15, 14) and has to pass through the restriction (6) when the non-return valve is closed ; characterised by the following features : d) the valve-closing member (15) of the non-return valve (15, 14) is loaded in the closing direction by a spring (18) ; e) with the valve-closing member (15) is associated a permanent magnet (17) which cooperates with a structural unit (1, 36), which is associated with the working piston (21) and has different magnetic properties in the axial direction, in such a manner that, during the stroke, initially the spring-loaded valve-closing member (15) is held open by the magnetic force and the magnetic force is relieved as soon as the working piston (21) reaches the predetermined position before the end of the stroke.

Description

Die Erfindung betrifft eine Einrichtung zur Endabbremsung des Arbeitskolbens eines doppeltwirkenden Arbeitszylinders gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a device for the end braking of the working piston of a double-acting working cylinder according to the preamble of claim 1.

Derartige doppeltwirkende Arbeitszylinder mit Endabbremsung werden überall dort eingesetzt, wo es erforderlich ist, in zwei Richtungen zunächst eine schnelle Bewegung zu übertragen und anschließend die Bewegung relativ langsam zu verzögern. Dies ist z. B. bei automatischen Türschließeinrichtungen erforderlich.Such double-acting working cylinders with end braking are used wherever it is necessary to first transmit a rapid movement in two directions and then to slow the movement relatively slowly. This is e.g. B. required for automatic door locking devices.

Eine bekannte Einrichtung der vorstehend erwähnten Art (Türzylinder 422 802 Europa-Katalog der Fa. WABCO Fahrzeugbremsen GmbH) ist derart aufgebaut, daß jede Kammer des doppeltwirkenden Arbeitszylinders über einen gedrosselten Durchgang ständig mit einem Druckmittelanschluß verbunden ist und über je ein hubabhängig gesteuertes Ventil mit relativ großem Querschnitt mit dem Druckmittelanschluß verbindbar ist. Das Ventil ist so ausgebildet und so angeordnet, daß es beim Erreichen einer vorgegebenen Position des Arbeitskolbens automatisch geschlossen wird, so daß die zu entlüftende Kammer dann nur noch über den gedrosselten Durchgang entlüftet wird.A known device of the type mentioned above (door cylinder 422 802 Europe catalog from WABCO Fahrzeugbremsen GmbH) is constructed in such a way that each chamber of the double-acting working cylinder is continuously connected to a pressure medium connection via a throttled passage and via a stroke-controlled valve with relative Large cross section can be connected to the pressure medium connection. The valve is designed and arranged such that it is automatically closed when a predetermined position of the working piston is reached, so that the chamber to be vented is then only vented via the throttled passage.

Die beschriebene stufenweise Entlüftung erfolgt bei der kolbenstangenseitigen Kammer dadurch, daß die Kolbenstange abgestuft ist und das dickere, dem Kolben zugewandte Teil der Kolbenstange mit einer in einer Zwischenwand des Zylinders angeordneten Ringdichtung das erwünschte Ventil für die Absperrung der Entlüftung großen Querschnitts von der kolbenstangenseitigen Kammer bildet. Die Ringdichtung weist eine die Belüftung der kolbenstangenseitigen Kammer ermöglichende Dichtlippe auf, die bei der Entlüftung am dickeren Teil der Kolbenstange dichtend anliegt.The stepwise ventilation described is carried out in the chamber on the piston rod side in that the piston rod is stepped and the thicker part of the piston rod facing the piston forms the desired valve for blocking the ventilation of the large cross section from the chamber on the piston rod side with an annular seal arranged in an intermediate wall of the cylinder . The ring seal has a sealing lip which enables the ventilation of the chamber on the piston rod side and which bears sealingly against the thicker part of the piston rod during the ventilation.

Da bei dieser bekannten Anordnung die Kolbenstange abgestuft und die Druckdichtung im Zylinderdeckel für den dünneren Teil der Kolbenstange bemessen ist, ist eine Verlängerung des Zylinders erforderlich, die den dickeren Teil der Kolbenstange aufnehmen kann.Since in this known arrangement the piston rod is graduated and the pressure seal in the cylinder cover is dimensioned for the thinner part of the piston rod, an extension of the cylinder is required which can accommodate the thicker part of the piston rod.

Aus der DE-A-2 063 223 ist eine magnetisch betätigbare Ventileinrichtung bekannt, die, an einem doppeltwirkenden Arbeitszylinder angeordnet, zur Entlüftung der jeweils vom Druckmittel beaufschlagten Kammer des Arbeitszylinders bei Annäherung des Arbeitskolbens an seine Endlage dient Mit dieser bekannten Ventileinrichtung läßt sich eine nicht nutzbare Verlängerung des Arbeitszylinders weitgehend vermeiden. Von Nachteil ist bei dieser Ventileinrichtung jedoch, daß der das Ventil schaltende Magnet vom Arbeitskolben mechanisch auf den Ventilverschlußkörper zu bewegt werden muß. Bedingt durch diese Ausbildung der Ventileinrichtung kann der Weg, der vom Kolben mit verringerter Geschwindigkeit zurückgelegt werden soll, um ein hartes Anschlagen des Kolbens am Zylinderdeckel zu verhindern, nur sehr kurz bemessen sein. Bei großen Arbeitszylindern, deren Kolben eine relativ große zu beschleunigende bzw. zu verzögernde Masse aufweisen, reicht dieser kurze Weg oft nicht aus, um die Kolbengeschwindigkeit wirksam zu verringern.From DE-A-2 063 223 a magnetically actuated valve device is known which, arranged on a double-acting working cylinder, serves for venting the chamber of the working cylinder acted upon by the pressure medium when the working piston approaches its end position. With this known valve device, one cannot Avoid largely usable extension of the working cylinder. A disadvantage of this valve device, however, is that the valve switching magnet must be moved mechanically from the working piston towards the valve closure member. As a result of this configuration of the valve device, the path that the piston is to travel at a reduced speed in order to prevent the piston from hitting the cylinder cover hard can be dimensioned only very briefly. In the case of large working cylinders whose pistons have a relatively large mass to be accelerated or decelerated, this short distance is often not sufficient to effectively reduce the piston speed.

Der Erfindung liegt deshalb die Aufgabe zugrunde, eine Einrichtung der eingangs genannten Art zu schaffen, bei der die beschriebene, für die Nutzung des Arbeitskolbens und somit der Kolbenstange nicht nutzbare Verlängerung des Zylinders mit einfachen Mitteln vermieden wird und welche eine sichere und ausreichende Verringerung der Geschwindigkeit des Kolbens vor Erreichen seiner Endlage gewährleistet.The invention is therefore based on the object to provide a device of the type mentioned, in which the described, not usable for the use of the working piston and thus the piston rod extension of the cylinder is avoided with simple means and which a safe and sufficient reduction in speed of the piston before reaching its end position.

Diese Aufgabe wird mit der im Patentanspruch 1 angegebenen Erfindung gelöst.This object is achieved with the invention specified in claim 1.

Vorteilhafte Weiterbildungen und Ausgestaltungen der Erfindung sind in den Unteransprüchen aufgezeigt.Advantageous further developments and refinements of the invention are shown in the subclaims.

Die erfindungsgemäße Einrichtung zeichnet sich neben kompakter und kurzer Bauweise des Arbeitszylinders dadurch aus, daß sowohl die in die Druckmittelkammern einzusteuernde Druckluft als auch die aus den Druckmittelkammern ausströmende Druckluft zum Schalten der Ventile benutzt wird, wodurch die Verwendung von kleinen Schalt- und Haltemagneten ermöglicht wird.The device according to the invention is characterized in addition to the compact and short construction of the working cylinder in that both the compressed air to be controlled into the pressure medium chambers and the compressed air flowing out of the pressure medium chambers are used for switching the valves, which enables the use of small switching and holding magnets.

Gemäß einer vorteilhaften Weiterbildung der Erfindung ist es möglich, den abgebremsten Hub des Arbeitskolbens durch Verschieben des magnetisch beeinflußbaren Rückschlagventils auf dem Arbeitszylinder zu verändern.According to an advantageous development of the invention, it is possible to change the braked stroke of the working piston by moving the magnetically influenced check valve on the working cylinder.

Anhand von zwei Ausführungsbeispielen wird die Erfindung nachstehend näher erläutert. Es zeigt

  • Fig. 1 einen doppeltwirkenden Arbeitszylinder mit einem Rückschlagventil, über welches eine Be- und Entlüftungsöffnung verschließbar ist, wobei das Rückschlagventil mittels eines am Ventilverschlußkörper befestigten Permanentmagneten und der in einen magnetisierbaren und einen nicht magnetisierbaren Teil unterteilten Kolbenstange in der Offenstellung haltbar ist, und
  • Fig. 2 einen doppeltwirkenden Arbeitszylinder, welcher ein zum Verschließen einer Be- und Entlüftungsöffnung dienendes Rückschlagventil aufweist, das von zwei Permanentmagneten schaltbar ist, wobei ein Permanentmagnet am Ventilverschlußkörper und ein Permanentmagnet auf der Kolbenstange angeordnet ist.
The invention is explained in more detail below using two exemplary embodiments. It shows
  • Fig. 1 is a double-acting cylinder with a check valve, via which a ventilation opening can be closed, the check valve by means of a permanent magnet attached to the valve closure body and the piston rod divided into a magnetizable and a non-magnetizable part in the open position, and
  • Fig. 2 shows a double-acting cylinder, which has a check valve serving to close a ventilation opening, which can be switched by two permanent magnets, wherein a permanent magnet is arranged on the valve closure member and a permanent magnet on the piston rod.

Fig. 1 zeigt einen doppeltwirkenden Arbeitszylinder, welcher durch einen mit einer Kolbenstange 1, 36 versehenen Arbeitskolben 21 in eine kolbenstangenseitige erste Druckmittelkammer 19 und eine bezüglich der ersten Druckmittelkammer 19 auf der anderen Seite des Arbeitskolbens 21 angeordnete zweite Druckmittelkammer 22 unterteilt ist. Die Kolbenstange 1, 36 wird durch eine in der die erste Druckmittelkammer 19 abschließenden Stirnwand angeordnete, mit einem Dichtelement 37 versehene Kolbenstangendurchführung aus dem Arbeitszylinder herausgeführt. Ein auf dem Umfang des Arbeitskolbens 21 angeordneter Dichtring 20 dichtet die erste Druckmittelkammer 1 gegen die zweite Druckmittelkammer 22 ab. Die Kolbenstange 1, 36 ist in einen nicht magnetisierbaren Teil 36 und einen magnetisierbaren Teil 1 im Verhältnis von in etwa 1 : 3 unterteilt. Der Arbeitszylinder weist zwei Druckmittelanschlüsse 13 und 23 auf, die über ein nicht gezeigtes Mehrwegeventil mit ei- ner Druckmittelquelle in Verbindung bringbar sind. Der Druckmittelanschluß 13 ist Bestandteil eines Schnellentlüftungsventils, welches einen Dichtsitz 12, einen Auslaßsitz 9 sowie einen fliegend gelagerten Ventilverschlußkörper 11 aufweist. Der Anschluß 23 ist ebenfalls Bestandteil eines Schnellentlüftungsventils, welches einen Dichtsitz 24, einen Auslaßsitz 26 sowie einen fliegend gelagerten Ventilverschlußkörper 25 aufweist.1 shows a double-acting working cylinder which is divided by a working piston 21 provided with a piston rod 1, 36 into a first pressure medium chamber 19 on the piston rod side and a second pressure medium chamber 22 arranged on the other side of the working piston 21 with respect to the first pressure medium chamber 19. The piston rod 1, 36 is arranged in the end wall, which closes the first pressure medium chamber 19, and is provided with a sealing element 37 lead out of the working cylinder. A sealing ring 20 arranged on the circumference of the working piston 21 seals the first pressure medium chamber 1 against the second pressure medium chamber 22. The piston rod 1, 36 is divided into a non-magnetizable part 36 and a magnetizable part 1 in a ratio of approximately 1: 3. The cylinder has two pressure medium connections 13 and 23 via an unshown multi-port valve with egg - can be brought ner pressure fluid source in communication. The pressure medium connection 13 is part of a quick exhaust valve, which has a sealing seat 12, an outlet seat 9 and a cantilevered valve closure member 11. The connection 23 is also part of a quick exhaust valve, which has a sealing seat 24, an outlet seat 26 and a cantilevered valve closure member 25.

Beide Schnellentlüftungsventile 19, 11, 12 und 24, 25, 26 weisen je einen zur Atmosphäre führenden Druckmittelauslaß 7 und 27 auf.Both quick exhaust valves 19, 11, 12 and 24, 25, 26 each have a pressure medium outlet 7 and 27 leading to the atmosphere.

An das mit dem Anschluß 13 versehene Schnellentlüftungsventil 9, 11, 12 schließt sich ein in das Arbeitszylindergehäuse integriertes Rückschlagventil an, welches aus einem Ventilsitz 14, einem Ventilverschlußkörper 15 und einer sich an einen Gehäuseabsatz 2 abstützenden, den Ventilverschlußkörper 15 in Richtung auf den Ventilsitz 14 zu beaufschlagenden Druckfeder 18 besteht. Ein Permanentmagnet 17 ist mit dem Ventilverschlußkörper 15 fest verbunden. Der Hub des Ventilverschlußkörpers 15 und somit auch des Permanentmagneten 17 wird in Richtung auf die Offenstellung zu durch einen im Ventilgehäuse vorgesehenen Anschlag 3, auf welchen sich eine mit dem Ventilverschlußkörper 15 fest verbundene Scheibe 5 auflegt, begrenzt. In der Scheibe 5 sind Durchlässe 4 vorgesehen, über welche die erste Druckmittelkammer 19 mit einer als Bypass dienenden Drosselbohrung 8 ständig verbunden ist. Die Drosselbohrung 8 führt zum Auslaß 7 des Schnellentlüftungsventils 9, 11, 12. Mittels einer Einstellschraube 6 ist der Querschnitt der Drosselbohrung 8 veränderbar.The quick-exhaust valve 9, 11, 12 provided with the connection 13 is followed by a check valve integrated in the working cylinder housing, which comprises a valve seat 14, a valve closure body 15 and a valve closure body 15, which is supported on a housing shoulder 2, in the direction of the valve seat 14 compression spring 18 to be acted upon. A permanent magnet 17 is firmly connected to the valve closure body 15. The stroke of the valve closure member 15 and thus also of the permanent magnet 17 is limited in the direction of the open position by a stop 3 provided in the valve housing, on which a disk 5 fixedly connected to the valve closure member 15 is placed. Passages 4 are provided in the disk 5, via which the first pressure medium chamber 19 is continuously connected to a throttle bore 8 serving as a bypass. The throttle bore 8 leads to the outlet 7 of the quick exhaust valve 9, 11, 12. The cross section of the throttle bore 8 can be changed by means of an adjusting screw 6.

Das Kolbenstangenteil 36 weist eine in axialer Richtung verlaufende, den Arbeitskolben 21 durchdringende Bohrung 34 auf, welche mit einem an der die zweite Druckmittelkammer 22 des Arbeitszylinders abschließenden Stirnseite angeordneten Dorn 32 steckerartig zusammenwirkt.The piston rod part 36 has an axially extending bore 34 which penetrates the working piston 21 and which cooperates in a plug-like manner with a mandrel 32 arranged on the end face which closes the second pressure medium chamber 22 of the working cylinder.

Der Dorn 32 weist eine in Längsrichtung verlaufende Bohrung 33 auf, über welche die zweite Druckmittelkammer 22 mit einem Kanal 28 und weiter mit dem zur Atmosphäre führenden Druckmittelauslaß 27 des Schnellentlüftungsventils 24, 25, 26 verbindbar ist. Eine Drosselbohrung 29 stellt eine ständige Verbindung zwischen der zweiten Druckmittelkammer 22 und dem Druckmittelauslaß 27 her. Der Querschnitt der Drosselbohrung 29 ist mittels einer Einstellschraube 30 veränderbar. An seiner rechten Stirnseite weist der Arbeitszylinder eine Befestigungsöse 31 auf.The mandrel 32 has a bore 33 running in the longitudinal direction, via which the second pressure medium chamber 22 can be connected to a channel 28 and further to the pressure medium outlet 27 of the quick exhaust valve 24, 25, 26 leading to the atmosphere. A throttle bore 29 establishes a permanent connection between the second pressure medium chamber 22 and the pressure medium outlet 27. The cross section of the throttle bore 29 can be changed by means of an adjusting screw 30. The working cylinder has a fastening eyelet 31 on its right end.

Die Funktion dieses Arbeitszylinders mit der Einrichtung zur Endabbremsung des Arbeitskolbens wird nachstehend näher erläutert.The function of this working cylinder with the device for the final braking of the working piston is explained in more detail below.

Es wird angenommen, daß die erste Druckmittelkammer 19 des Arbeitszylinders belüftet und die zweite Druckmittelkammer 22 des Arbeitszylinders entlüftet ist, so daß sich der Arbeitskolben 21 in seiner rechten Endlage befindet. Der Dorn 32 wird in dieser Endlage des Arbeitskolbens 21 von der im nicht magnetisierbaren Teil 36 der Kolbenstange angeordneten Bohrung 34 aufgenommen. Am Anschluß 13 des zur ersten Druckmittelkammer 19 gehörigen Schnellentlüftungsventils 9,11, 12 und in der ersten Druckmittelkammer 19 steht Druckmittel an. Der Ventilverschlußkörper 11 des Schnellentlüftungsventils 9, 11, 12 wird vom Druckmittel am Anschluß 13 auf dem Auslaßsitz 9 gehalten, so daß das Druckmittel nicht über den Druckmittelauslaß 7 aus der ersten Druckmittelkammer 19 entweichen kann.It is assumed that the first pressure medium chamber 19 of the working cylinder is vented and the second pressure medium chamber 22 of the working cylinder is vented, so that the working piston 21 is in its right end position. The mandrel 32 is received in this end position of the working piston 21 by the bore 34 arranged in the non-magnetizable part 36 of the piston rod. Pressure medium is present at the connection 13 of the quick exhaust valve 9, 11, 12 belonging to the first pressure medium chamber 19 and in the first pressure medium chamber 19. The valve closure member 11 of the quick exhaust valve 9, 11, 12 is held by the pressure medium at the connection 13 on the outlet seat 9, so that the pressure medium cannot escape from the first pressure medium chamber 19 via the pressure medium outlet 7.

Der Ventilverschlußkörper 15 des Rückschlagventils 14, 15, 18 ist beim Belüften der ersten Druckmittelkammer 19 durch die Kraft des Druckmittels gegen die Kraft der Druckfeder 18 in Richtung auf den Anschlag 3 zu verschoben und das Rückschlagventil 14, 15, 18 so in die Offenstellung gebracht worden. Der mit dem Permanentmagneten 17 verbundene Ventilverschlußkörper 15 wird durch die Kraft des Druckmittels in dieser Stellung gehalten. Eine zusätzliche Haltekraft wird durch das Magnetfeld, welches sich um den magnetisierbaren Teil 1 der Kolbenstange und den Permanentmagneten 17 aufgebaut hat, erzeugt.The valve closure member 15 of the check valve 14, 15, 18 is displaced in the direction of the stop 3 when the first pressure medium chamber 19 is ventilated by the force of the pressure medium against the force of the compression spring 18, and the check valve 14, 15, 18 has thus been brought into the open position . The valve closure member 15 connected to the permanent magnet 17 is held in this position by the force of the pressure medium. An additional holding force is generated by the magnetic field, which has built up around the magnetizable part 1 of the piston rod and the permanent magnet 17.

Soll der Arbeitskolben 21 in seine linke Endlage gebracht und die Kolbenstange 1, 36 aus dem Arbeitszylinder ausgefahren werden, so wird das zwischen der nicht gezeigten Druckmittelquelle und den Anschlüssen 13, 23 angeordnete, ebenfalls nicht dargestellte Ventil umgeschaltet.If the working piston 21 is to be brought into its left end position and the piston rod 1, 36 is extended out of the working cylinder, the valve, also not shown, which is arranged between the pressure medium source (not shown) and the connections 13, 23 is switched over.

Über den Anschluß 23, das Schnellentlüftungsventil 24, 25, 26 sowie den Kanal 28 und die Bohrung 29 bzw. 33 wird die zweite Druckmittelkammer 22 belüftet. Gleichzeitig wird die zum Anschluß 13 führende Druckmittelleitung entlüftet. Durch die Verschiebung des Arbeitskolbens 21 in Richtung auf die erste Druckmittelkammer 19 zu wird das in der ersten Druckmittelkammer 19 befindliche Druckmittel über das geöffnete Rückschlagventil 14, 15, 18, die Drosselbohrung 8, den Durchlaß 10 und den Druckmittelauslaß 7 aus der ersten Druckmittelkammer 19 herausgedrückt. Das durch den Durchlaß 10 hindurchströmende Druckmittel bewirkt, daß der Ventilverschlußkörper 11 sich auf den Dichtsitz 12 des Schnellentlüftungsventils auflegt.Via the connection 23, the quick exhaust valve 24, 25, 26 and the channel 28 and the bore 29 and 33, the second pressure medium chamber 22 is vented. At the same time, the pressure medium line leading to connection 13 is vented. By displacing the working piston 21 in the direction of the first pressure medium chamber 19, the pressure medium located in the first pressure medium chamber 19 is pressed out of the first pressure medium chamber 19 via the open check valve 14, 15, 18, the throttle bore 8, the passage 10 and the pressure medium outlet 7 . The pressure medium flowing through the passage 10 causes the valve closure body 11 to rest on the sealing seat 12 of the quick exhaust valve.

Der Druckmittelanschluß 13 ist jetzt geschlossen, und der Druckmittelauslaß 7 ist geöffnet. Durch das geöffnete Rückschlagventil 14, 15, 18 sowie den Durchlaß 10 entweicht das Druckmittel aus der ersten Druckmittelkammer 19 zunächst schnell zur Atmosphäre.The pressure medium connection 13 is now closed and the pressure medium outlet 7 is open. Through the opened check valve 14, 15, 18 and the passage 10, the pressure medium escapes quickly from the first pressure medium chamber 19 to the atmosphere.

Das Rückschlagventil 14, 15, 18 wird so lange in der Offenstellung gehalten, wie sich das magnetisierbare Teil 1 der Kolbenstange 1, 36 im Bereich des mit dem Ventilverschlußkörper 15 verbundenen Permanentmagneten 17 befindet.The check valve 14, 15, 18 is held in the open position as long as the magnetizable part 1 of the piston rod 1, 36 is in the region of the permanent magnet 17 connected to the valve closure body 15.

Ist die Kolbenstange 1, 36 so weit aus dem Arbeitszylinder ausgefahren, daß das mägnetisierbare Teil 1 der Kolbenstange 1, 36 den Bereich des Permanentmagneten 17 verlassen hat, so wird der Ventilverschlußkörper 15 von der Druckfeder 18 zurückgestellt und kommt am Ventilsitz 14 zur Anlage. Das aus der ersten Druckmittelkammer 19 verdrängte Druckmittel gelangt jetzt nur noch über die Drosselbohrung 8 zum Druckmittelauslaß 7 des Schnellentlüftungsventils 9, 11, 12.If the piston rod 1, 36 is extended so far from the working cylinder that the magnetizable part 1 of the piston rod 1, 36 has left the area of the permanent magnet 17, the valve closure member 15 is reset by the compression spring 18 and comes into contact with the valve seat 14. The pressure medium displaced from the first pressure medium chamber 19 now only reaches the pressure medium outlet 7 of the quick exhaust valve 9, 11, 12 via the throttle bore 8.

Dadurch, daß das Druckmittel jetzt nur noch gedrosselt aus der ersten Druckmittelkammer 19 entweichen kann, wird die Bewegung des Arbeitskolbens 21 in Richtung auf seine linke Endstellung zu verlangsamt. Die Schließkraft der auf den Ventilverschlußkörper 15 einwirkenden Druckfeder 18 wird durch den die Ringfläche der mit dem Ventilverschlußkörper 15 fest verbundenen Scheibe 5 und die Stirnfläche des Permanentmagneten 17 beaufschlagenden Druck aus der ersten Druckmittelkammer 19 verstärktBecause the pressure medium can now only escape throttled from the first pressure medium chamber 19, the movement of the working piston 21 in the direction of its left end position is slowed down. The closing force of the compression spring 18 acting on the valve closure body 15 is increased by the pressure from the first pressure medium chamber 19 which acts on the annular surface of the disk 5 which is firmly connected to the valve closure body 15 and on the end surface of the permanent magnet 17

Soll die Kolbenstange 1, 36 wieder in den Arbeitszylinder eingefahren werden, so wird der Anschluß 13 des Schnellentlüftungsventils 9, 11, 12 mit der Druckmittelquelle verbunden und die Druckmittelzufuhr zum Anschluß 23 des zur zweiten Druckmittelkammer 22 gehörigen Schnellentlüftungsventils 24, 25, 26 gesperrt.If the piston rod 1, 36 is to be retracted into the working cylinder, the connection 13 of the quick exhaust valve 9, 11, 12 is connected to the pressure medium source and the pressure medium supply to the connection 23 of the quick exhaust valve 24, 25, 26 belonging to the second pressure medium chamber 22 is blocked.

Durch die Kraft des Druckmittels wird der Ventilverschlußkörper 11 des Schnellentlüftungsventils 9, 11, 12 vom Dichtsitz 12 abgehoben und gegen den Auslaßsitz 9 gedrückt. Das durch das Schnellentlüftungsventil 9, 11, 12 in den Durchlaß 10 strömende Druckmittel beaufschlagt die dem Schnellentlüftungsventil 9, 11, 12 zugewandte Fläche des Ventilverschlußkörpers 15 des Rückschlagventils 14,15,18 und verschiebt den Ventilverschlußkörper 15 und somit den Permanentmagneten 17 entgegen der Kraft der Druckfeder 18 in Richtung auf den Anschlag 3 zu. Durch das nun geöffnete Rückschlagventil 14, 15, 18 gelangt Druckmittel in die erste Druckmittelkammer 19, wodurch eine Verschiebung des Arbeitskolbens 21 in Richtung auf die zweite Druckmittelkammer 22 zu bewirkt wird.Due to the force of the pressure medium, the valve closure member 11 of the quick exhaust valve 9, 11, 12 is lifted off the sealing seat 12 and pressed against the outlet seat 9. The pressure medium flowing through the quick exhaust valve 9, 11, 12 into the passage 10 acts on the surface of the valve closure member 15 of the check valve 14, 15, 18 facing the quick exhaust valve 9, 11, 12 and displaces the valve closure member 15 and thus the permanent magnet 17 against the force of the Compression spring 18 in the direction of the stop 3. Through the now open check valve 14, 15, 18, pressure medium enters the first pressure medium chamber 19, as a result of which the working piston 21 is displaced in the direction of the second pressure medium chamber 22.

Der Druck in der zweiten Druckmittelkammer 22 wird zuerst über die im Dorn 32 vorgesehene Bohrung 33 und die Drosselbohrung 29 sowie den Druckmittelauslaß 27 schnell abgebaut. Sobald der Dorn 32 von der im Dichtelement 35 versehenen, im Arbeitskolben 21 sowie in dem Kolbenstangenteil 36 angeordneten Bohrung 34 aufgenommen wird, kann das Druckmittel nur noch über die Drosselbohrung 29 aus der zweiten Druckmittelkammer 22 entweichen. Folglich fährt der Arbeitskolben 21 jetzt verlangsamt bis in seine rechte Endlage.The pressure in the second pressure medium chamber 22 is first quickly reduced via the bore 33 provided in the mandrel 32 and the throttle bore 29 and the pressure medium outlet 27. As soon as the mandrel 32 is received by the bore 34 provided in the sealing element 35 and arranged in the working piston 21 and in the piston rod part 36, the pressure medium can only escape from the second pressure medium chamber 22 via the throttle bore 29. Consequently, the working piston 21 now slows down to its right end position.

Das der ersten Druckmittelkammer 19 zugeordnete Rückschlagventil 14,15,18 bleibt weiterhin geöffnet, da sich der magnetisierbare Teil 1 der Kolbenstange 1, 36 im Bereich des Permanentmagneten 17 befindet.The check valve 14, 15, 18 assigned to the first pressure medium chamber 19 remains open since the magnetizable part 1 of the piston rod 1, 36 is located in the area of the permanent magnet 17.

Der in Fig. dargestellte Arbeitszylinder ist durch einen mit einer Kolbenstange 38 versehenen Arbeitskolben 66 in eine kolbenstangenseitige erste Druckmittelkammer 71 und eine gegenüber der ersten Druckmittelkammer 71 auf der anderen Seite des Arbeitskolbens 66 angeordnete zweite Druckmittelkammer 65 unterteilt. Die Kolbenstange 38 wird durch eine mit einer ringförmigen Dichtung 39 versehene Kolbenstangendurchführung aus dem Arbeitszylinder herausgeführt.The working cylinder shown in FIG. Is divided by a working piston 66 provided with a piston rod 38 into a first pressure medium chamber 71 on the piston rod side and a second pressure medium chamber 65 arranged on the other side of the working piston 66 opposite the first pressure medium chamber 71. The piston rod 38 is led out of the working cylinder through a piston rod bushing provided with an annular seal 39.

Der Arbeitskolben 66 weist eine in Umfangsrichtung verlaufende Dichtung 68 auf, mittels welcher die beiden Druckmittelkammern 71, 65 druckdicht voneinander getrennt werden.The working piston 66 has a circumferential seal 68, by means of which the two pressure medium chambers 71, 65 are separated from one another in a pressure-tight manner.

Auf dem Arbeitszylinder ist ein Rückschlagventil befestigt, welches einen Ventilsitz 47 und einen von einer Druckfeder 43 in Richtung auf den Ventilsitz 47 zu beaufschlagten Ventilver- schlußkörper 46 aufweist. Ein mit dem Ventilverschlußkörper 46 fest verbundener Eisenkern 42 ist in einem ringförmigen ersten Permanentmagneten-41, welcher im Ventilgehäuse angeordnet ist, verschiebbar gelagert. Das Rückschlagventil 47,46,43 ist einerseits über eine Druckmittelleitung 40 mit der ersten Druckmittelkammer 71 des Arbeitszylinders und andererseits über einen Kanal 48 mit einem ersten Schnellentlüftungsventil verbunden, welches einen Druckmittelanschluß 52, einen Dichtsitz 51, einen Auslaßsitz 49, einen zur Atmosphäre führenden Druckmittelauslaß 53 sowie einen fliegend gelagerten Ventilverschlußkörper50 aufweist.In the working cylinder a check valve is attached, which he has a valve seat 47 and a p by a compression spring 43 toward the valve seat 47 to applied Ventilver- schlußkör 46th An iron core 42 firmly connected to the valve closure body 46 is slidably mounted in an annular first permanent magnet 41, which is arranged in the valve housing. The check valve 47, 46, 43 is connected on the one hand via a pressure medium line 40 to the first pressure medium chamber 71 of the working cylinder and on the other hand via a channel 48 to a first quick exhaust valve which has a pressure medium connection 52, a sealing seat 51, an outlet seat 49 and a pressure medium outlet leading to the atmosphere 53 and a cantilevered valve closure body 50.

Zwischen der von der ersten Druckmittelkammer 71 des Arbeitszylinders zum Rückschlagventil46, 47, 43 führenden Druckmittelleitung 40 und dem vom Rückschlagventil 47, 46, 43 zum Schnellentlüftungsventil 49, 50, 51 führenden Kanal 48 ist im Ventilgehäuse eine Drosselbohrung 45 angeordnet. Der Querschnitt der Drosselbohrung 45 ist mittels einer Einstellschraube 44 veränderbar.A throttle bore 45 is arranged in the valve housing between the pressure medium line 40 leading from the first pressure medium chamber 71 of the working cylinder to the check valve 46, 47, 43 and the channel 48 leading from the check valve 47, 46, 43 to the quick exhaust valve 49, 50, 51. The cross section of the throttle bore 45 can be changed by means of an adjusting screw 44.

Der Druckmittelanschluß 52 des Schnellentlüftungsventils 49, 50, 51 ist über ein nicht dargestelltes Umschaltventil mit einer Druckmittelquelle verbindbar.The pressure medium connection 52 of the quick exhaust valve 49, 50, 51 can be connected to a pressure medium source via a switch valve (not shown).

Ein zweites, mit dem Arbeitszylinder fest verbundenes Schnellentlüftungsventil ist über einen Druckmittelanschluß 54 und das Umschaltventil ebenfalls mit der Druckmittelquelle verbindbar. Das zweite Schnellentlüftungsventil weist einen Dichtsitz 55, einen Auslaßsitz 57, einen fliegend gelagerten Ventilverschlußkörper 56 sowie einen zur Atmosphäre führenden Druckmittelauslaß 58 auf.A second quick exhaust valve, which is firmly connected to the working cylinder, can also be connected to the pressure medium source via a pressure medium connection 54 and the changeover valve. The second quick exhaust valve has a sealing seat 55, an outlet seat 57, a cantilevered valve closure member 56 and a pressure medium outlet 58 leading to the atmosphere.

Über einen Kanal 59 sowie eine in einem Dorn 64 vorgesehene Bohrung 63 ist das Schnellent lüftungsventil 55, 56, 57 mit der zweiten Druckmittelkammer 65 des Arbeitszylinders verbunden.The quick exhaust valve 55, 56, 57 is connected to the second pressure medium chamber 65 of the working cylinder via a channel 59 and a bore 63 provided in a mandrel 64.

Der Dorn 64 ist an der die zweite Druckmittelkammer 65 begrenzenden Stirnseite des Arbeitszylinders fest angeordnet und bildet zusammen mit einer den Arbeitskolben 66 in axialer Richtung durchdringender und sich ein Stück in die Kolbenstange 38 erstreckenden Bohrung 70 ein Ventil. Die Bohrung 70 wird im Bereich der Stirnseite des Arbeitskolbens 66 von einem Dichtring 67 umschlossen.The mandrel 64 is on the end face of the work delimiting the second pressure medium chamber 65 firmly arranged cylinder and forms a valve together with a bore 70 penetrating the working piston 66 in the axial direction and extending a bit into the piston rod 38. The bore 70 is enclosed in the area of the end face of the working piston 66 by a sealing ring 67.

Eine in der die zweite Druckmittelkammer 65 begrenzenden Stirnwand des Arbeitszylinders angeordnete Drosselbohrung 61 verbindet die zweite Druckmittelkammer 65 mit dem zum Schnellentlüftungsventil 55, 56, 57 führenden Kanal 59. Mittels einer Einstellschraube 62 ist der Querschnitt der Drosselbohrung 61 veränderbar.A throttle bore 61 arranged in the end wall of the working cylinder delimiting the second pressure medium chamber 65 connects the second pressure medium chamber 65 to the channel 59 leading to the quick exhaust valve 55, 56, 57. The cross section of the throttle bore 61 can be changed by means of an adjusting screw 62.

Auf der Kolbenstange 38 ist in der Nähe des Arbeitskolbens 66 ein zweiter ringförmiger Permanentmagnet 69 angeordnet.A second annular permanent magnet 69 is arranged on the piston rod 38 in the vicinity of the working piston 66.

An der rechten Stirnseite des Arbeitszylinders ist eine Halterung 60 vorgesehen.A holder 60 is provided on the right end face of the working cylinder.

Die Funktion des Arbeitszylinders mit der Einrichtung zur Endabbremsung des Arbeitskolbens wird im folgenden näher erläutert.The function of the working cylinder with the device for the final braking of the working piston is explained in more detail below.

Es wird angenommen, daß der Arbeitskolben 66 sich in seiner rechten Endlage befindet und die Kolbenstange 38 in den Arbeitszylinder eingefahren ist.It is assumed that the working piston 66 is in its right end position and the piston rod 38 is retracted into the working cylinder.

Die zweite Druckmittelkammer 65 ist entlüftet, und die erste Druckmittelkammer 71 ist belüftet.The second pressure medium chamber 65 is vented and the first pressure medium chamber 71 is vented.

Beim Belüften der ersten Druckmittelkammer 71 ist der Ventilverschlußkörper 46 des Rückschlagventils 46, 47, 43 zusammen mit dem Eisenkern 42 vom Druckmittel in Richtung auf das Arbeitszylindergehäuse zu verschoben und so das Rückschlagventil 46, 47, 43 geöffnet worden. Der Permanentmagnet 41 ist so angeordnet und so ausgelegt, daß er den Eisenkern 42 mit dem Ventilverschlußkörper 46 gegen die Kraft der Druckfeder43 in der vom Ventilsitz 47 abgehobenen Lage hält.When the first pressure medium chamber 71 is ventilated, the valve closure body 46 of the check valve 46, 47, 43 together with the iron core 42 has been displaced from the pressure medium in the direction of the working cylinder housing and the check valve 46, 47, 43 has thus been opened. The permanent magnet 41 is arranged and designed so that it holds the iron core 42 with the valve closure body 46 against the force of the compression spring 43 in the position lifted from the valve seat 47.

Soll der Arbeitskolben 66 in seine linke Endlage gebracht und so die Kolbenstange 38 aus dem Arbeitszylinder ausgefahren werden, so wird die Druckmittelzufuhr zum Druckmittelanschluß 52 des der ersten Druckmittelkammer 71 zugeordneten Schnellentlüftungsventils 49, 50, 51 unterbrochen und über das der zweiten Druckmittelkammer 65 zugeordnete Schnellentlüftungsventil 55, 56, 57, den Kanal 59 und die Bohrung 61 bzw. 63 Druckmittel in die zweite Druckmittelkammer 65 eingesteuert.If the working piston 66 is to be brought into its left end position and the piston rod 38 is thus extended from the working cylinder, the pressure medium supply to the pressure medium connection 52 of the quick exhaust valve 49, 50, 51 assigned to the first pressure medium chamber 71 is interrupted and via the quick exhaust valve 55 assigned to the second pressure medium chamber 65 , 56, 57, the channel 59 and the bore 61 or 63 pressure medium introduced into the second pressure medium chamber 65.

Durch die Verschiebung des Arbeitskolbens 66 in Richtung auf die erste Druckmittelkammer 71 zu verschiebt das aus der ersten Druckmittelkammer 71 austretende Druckmittel den Ventilverschlußkörper 50 in Richtung auf den Dichtsitz 51 zu. Durch das geöffnete Rückschlagventil 46, 47, 43, den Kanal 48, das Schnellentlüftungsventil 49, 50 und den Druckmittelauslaß 53 wird der Druck in der ersten Druckmittelkammer 71 zunächst schnell abgebaut.Due to the displacement of the working piston 66 in the direction of the first pressure medium chamber 71, the pressure medium emerging from the first pressure medium chamber 71 shifts the valve closure body 50 in the direction of the sealing seat 51. Through the opened check valve 46, 47, 43, the channel 48, the quick exhaust valve 49, 50 and the pressure medium outlet 53, the pressure in the first pressure medium chamber 71 is initially quickly reduced.

Hat der auf der Kolbenstange 38 angeordnete zweite Permanentmagnet 69 durch die Verschiebung des Arbeitskolbens 66 den Wirkungsbereich des im Ventilgehäuse angeordneten ersten Permanentmagneten 41 erreicht, so hebt der zweite Permanentmagnet 69 die Kraft des ersten Permanentmagneten 41 auf (erster und zweiter Permanentmagnet sind gegensätzlich gepolt zueinander angeordnet).If the second permanent magnet 69 arranged on the piston rod 38 has reached the effective range of the first permanent magnet 41 arranged in the valve housing by the displacement of the working piston 66, the second permanent magnet 69 cancels the force of the first permanent magnet 41 (the first and second permanent magnets are arranged with opposite polarity to one another ).

Durch die Kraft der Druckfeder 43 wird der Ventilverschlußkörper 46 gegen den Ventilsitz 47 gedrückt, so daß das Rückschlagventil 46, 47, 43 wieder geschlossen ist.By the force of the compression spring 43, the valve closure member 46 is pressed against the valve seat 47, so that the check valve 46, 47, 43 is closed again.

Das Druckmittel kann jetzt nur noch über die Drosselbohrung 45 zum Druckmittelauslaß 53 gelangen.The pressure medium can now only reach the pressure medium outlet 53 via the throttle bore 45.

Die weitere Verschiebung des Arbeitskolbens 66 bis in seine linke Endlage erfolgt jetzt verlangsamt.The further displacement of the working piston 66 to its left end position is now slowed down.

Soll die Kolbenstange 38 wieder in den Arbeitszylinder eingefahren werden, so wird der Druckmittelanschluß 52 des ersten Schnellentlüftungsventils 49, 50, 51 mit der Druckmittelquelle verbunden und die Druckmittelzufuhr zum Druckmittelanschluß 54 des der zweiten Druckmittelkammer 65 zugeordneten Schnellentlüftungsventils 55, 56, 57 gesperrt.If the piston rod 38 is to be retracted into the working cylinder, the pressure medium connection 52 of the first quick exhaust valve 49, 50, 51 is connected to the pressure medium source and the pressure medium supply to the pressure medium connection 54 of the quick ventilation valve 55, 56, 57 assigned to the second pressure medium chamber 65 is blocked.

Durch das erste Schnellentlüftungsventil 49, 50, 51, das Rückschlagventil 46, 47, 43 und die Druckmittelleitung 40 strömt Druckmittel in die erste Druckmittelkammer 71 des Arbeitszylinders und verschiebt den Arbeitskolben 66 in Richtung auf die zweite Druckmittelkammer 65 zu. Der Druck in der zweiten Druckmittelkammer 65 wird zunächst über die im Dorn 64 vorgesehene Bohrung 63, die Drosselbohrung 61, den Kanal 59 und den Druckmittelauslaß 58 schnell abgebaut. Sobald der Dorn 64 von der mit dem Dichtelement 67 versehenen, im Arbeitskolben 66 sowie in der Kolbenstange 38 angeordneten Bohrung 70 aufgenommen wird, kann das Druckmittel nur noch über die Drosselbohrung 61 aus der zweiten Druckmittelkammer 65 entweichen. Der Arbeitskolben 66 fährt jetzt verlangsamt bis in seine rechte Endlage.Pressure medium flows through the first quick exhaust valve 49, 50, 51, the check valve 46, 47, 43 and the pressure medium line 40 into the first pressure medium chamber 71 of the working cylinder and displaces the working piston 66 in the direction of the second pressure medium chamber 65. The pressure in the second pressure medium chamber 65 is first rapidly reduced via the bore 63 provided in the mandrel 64, the throttle bore 61, the channel 59 and the pressure medium outlet 58. As soon as the mandrel 64 is received by the bore 70 provided with the sealing element 67 and arranged in the working piston 66 and in the piston rod 38, the pressure medium can only escape from the second pressure medium chamber 65 via the throttle bore 61. The working piston 66 now slows down to its right end position.

Claims (10)

1. Device for braking the final part of the stroke of the working piston (21) of a double-action working cylinder, which piston is provided with a piston rod (1, 36), having the following features:
a) one of the pressure-medium chambers (19) of the working cylinder is connected via a non-return valve (15, 14) to the associated pressure-medium connection (13) for the input and output of the pressure medium, the non-return valve (15, 14) being arranged in such a manner that it can be brought into the open position in the direction towards the pressure-medium chamber (19);
b) the pressure-medium chamber (19) is additionally connected directly to the pressure-medium connection (13) via a bore (8) provided with a restriction (6);
c) the non-return valve (15,14) is arranged and designed in such a manner that, when the pressure medium is output from the pressure-medium chamber (19), initially the non-return valve (14, 15) is opened and, after a predetermined position ot the working cylinder (21) has been reached, before the end of the stroke, the non-return valve (14, 15) is closed in order that the pressure medium displaced by the working piston (21) can initially flow substantially unhindered out through the open non-return valve (15, 14) and has to pass through the restriction (6) when the non-return valve is closed;

characterised by the following features:
d) the valve-closing member (15) of the non-return valve (15, 14) is loaded in the closing direction by a spring (18);
e) with the valve-closing member (15) is associated a permanent magnet (17) which cooperates with a structural unit (1, 36), which is associated with the working piston (21) and has different magnetic properties in the axial direction, in such a manner that, during the stroke, initially the spring-loaded valve-closing member (15) is held open by the magnetic force and the magnetic force is relieved as soon as the working piston (21) reaches the predetermined position before the end of the stroke.
2. Device according to claim 1, characterised by the following features:
a) the valve-closing member (15) of the non-return valve (14, 15, 18) is rigidly connected to a permanent magnet (17);
b) in order to move the permanent magnet (17), the structural unit (1, 36) is divided in the axial direction into an area (1) comprising magnetisable material, and an area (36) comprising non-magnetisable material, the area (36) comprising non-magnetisable material being opposite the permanent magnet (17) in a radially inwards direction when the working piston (21) is near the end position.
- 3. Device according to claim 2, characterised in that the structural unit is formed by the piston rod (1, 36).
4. Device according to claim 1, characterised by the following features:
a) an iron core (42) is located on the valve-closing member (46) of the non-return (46, 47, 43);
b) with the iron core (42) is associated a first permanent magnet (41) which can hold the valve-closing member (46), which is connected to the iron core (42), in the position raised from the valve seat (47) against the closing force of the spring (43);
c) with the working piston (66) is associated a second permanent magnet (69) which is arranged in such a manner that it relieves the holding force of the first permanent magnet (41) as the working pistion (66) approaches its end position.
5. Device according to claim 4, characterised in that the second permanent magnet (69) is located on the piston rod (38) of the working piston (66).
6. Device according to any one of claims 1 to 5, characterised in that a device for braking the final part of the stroke of the working piston is associated with each of the two pressure-medium chambers (19, 22) of the working cylinder.
7. Device according to any one of the preceding claims, characterised in that the non-return valve (14, 15, 18)"can be brought into the open position against the force of a pressure spring (18).
8. Device according to any one of claims 1 to 6, characterised by the following features:
a) between the non-return valve (14,15,18) and the pressure-medium connection (13) is located a rapid relief valve (9, 11, 12);
b) the rapid relief valve (9, 11, 12) is designed and arranged in such a manner that, while the pressure medium is being input into the associated pressure-medium chamber (19) of the working cylinder, it closes an outlet (7), which is connected to the non-return valve (14, 15, 18) and leads to the atmosphere, and releases the connection between the pressure-medium connection (13) and the non-return valve (14, 15, 18), and, when pressure medium is output from the pressure-medium chamber of the working cylinder, is moved away from the outlet (7) by pressure medium from the pressure-medium chamber (19), and blocks the connection between the pressure-medium connection (13) and the non-return valve (14, 15,18).
9. Device according to claim 8, characterised in that the non-return valve (14, 15, 18) and the rapid relief valve (9, 11, 12) are arranged in the area in which the piston rod passes through the working cylinder.
10. Device according to any one of the preceding claims, characterised by the following features:
a) the non-return valve (46, 47, 43) is designed as a structural unit that is separate from the working cylinder and is detachably arranged on the latter;
b) the chamber of the non-return valve (46, 47, 43) that is connected to the pressure-medium chamber (71) of the working cylinder is connected to the working cylinder by way of a pressure-medium line (40).
EP82101329A 1981-03-16 1982-02-22 End-of-stroke cushioning device for a piston of a double-acting cylinder Expired EP0060412B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82101329T ATE13215T1 (en) 1981-03-16 1982-02-22 DEVICE FOR FINAL BRAKING OF THE WORKING PISTON OF A DOUBLE-ACTING WORKING CYLINDER.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3110132 1981-03-16
DE19813110132 DE3110132A1 (en) 1981-03-16 1981-03-16 DEVICE FOR STOPPING THE WORKING PISTON OF A DOUBLE-ACTING WORK CYLINDER

Publications (2)

Publication Number Publication Date
EP0060412A1 EP0060412A1 (en) 1982-09-22
EP0060412B1 true EP0060412B1 (en) 1985-05-08

Family

ID=6127433

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82101329A Expired EP0060412B1 (en) 1981-03-16 1982-02-22 End-of-stroke cushioning device for a piston of a double-acting cylinder

Country Status (4)

Country Link
EP (1) EP0060412B1 (en)
AT (1) ATE13215T1 (en)
DE (2) DE3110132A1 (en)
ES (1) ES8303626A1 (en)

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DE4400483C2 (en) * 1994-01-11 1996-12-19 Invest Tech Ag Linear drive cylinder
GB9501117D0 (en) * 1995-01-20 1995-03-08 Norgren Martonair Gmbh Fluid-powered cylinder
TW451031B (en) * 1999-10-01 2001-08-21 Smc Corp Linear actuator with air buffer mechanism
US6633015B2 (en) * 2000-12-08 2003-10-14 Doben Limited Soft-touch pneumatic drive unit
US8065930B2 (en) * 2008-03-26 2011-11-29 GM Global Technology Operations LLC Hydraulic actuator for transmissions having reduced noise
GB0810391D0 (en) * 2008-06-06 2008-07-09 Isentropic Ltd Fluid servo and applications

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DE7122330U (en) * 1971-09-09 Gebr Felss Working cylinder with hydraulic or pneumatic actuation
US2464962A (en) * 1945-09-27 1949-03-22 Westinghouse Air Brake Co Fluid pressure motor
DE1239948B (en) * 1959-06-30 1967-05-03 Stothert & Pitt Ltd Double-acting pressure cylinder activated by pressure medium
US3157095A (en) * 1962-04-12 1964-11-17 Elmer F Heiser Piston and cylinder device
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Title
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Also Published As

Publication number Publication date
EP0060412A1 (en) 1982-09-22
ES510432A0 (en) 1983-02-01
ATE13215T1 (en) 1985-05-15
DE3110132A1 (en) 1982-09-23
ES8303626A1 (en) 1983-02-01
DE3263635D1 (en) 1985-06-13

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