EP0080579A1 - 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
EP0080579A1
EP0080579A1 EP82109146A EP82109146A EP0080579A1 EP 0080579 A1 EP0080579 A1 EP 0080579A1 EP 82109146 A EP82109146 A EP 82109146A EP 82109146 A EP82109146 A EP 82109146A EP 0080579 A1 EP0080579 A1 EP 0080579A1
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EP
European Patent Office
Prior art keywords
piston rod
pressure medium
region
sealing element
piston
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.)
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EP82109146A
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German (de)
French (fr)
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
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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
Publication of EP0080579A1 publication Critical patent/EP0080579A1/en
Withdrawn legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/22—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke
    • F15B15/223—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke having a piston with a piston extension or piston recess which completely seals the main fluid outlet as the piston approaches its end position

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 deceleration are used wherever it is necessary to first transmit a rapid movement in two directions and then to decelerate the movement relatively strongly. 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 constantly connected to a first vent during venting and relative to each with a second vent via a valve large cross section is connectable.
  • 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 first vent.
  • the stepwise ventilation described in the piston rod-side chamber takes place in that the piston rod is stepped, the thicker region of the piston rod facing the piston, with an intermediate wall of the cylinder, forming the desired valve for blocking the second ventilation from the piston rod side chamber.
  • the invention is therefore based on the object of providing a device of the type mentioned at the beginning in which the described extension of the cylinder is avoided with simple means.
  • the device according to the invention is characterized by a compact and short construction of the working cylinder.
  • the illustration shows a double-acting working cylinder, the piston rod of which has a polygonal profile, the piston rod forming a valve with a correspondingly designed sealing element.
  • the figure shows a double-acting working cylinder which is divided by a working piston 17 provided with a piston rod 1 into a first pressure medium chamber 13 on the piston rod side and a second pressure medium chamber 18 arranged on the other side of the working piston 17 with respect to the first pressure medium chamber 13.
  • a sealing ring 32 arranged on the circumference of the working piston 17 seals the first pressure medium chamber 13 against the second pressure medium chamber 18.
  • the piston rod 1 is of polygonal design and has a first area 15 adjoining the working piston 17 and a second area 38 with a smaller cross section with the same enveloping circle, which adjoins the first area 15.
  • a stepped bore 34, 37 is arranged coaxially to the first region 15 of the piston rod 1 in the end wall of the working cylinder on the piston rod side.
  • the bore 34, 37 serves as a feedthrough for the piston rod 1: in the stepped part 34 of the bore 34, 37 there is a first sealing element 33 which surrounds the piston rod 1 and is designed such that the piston rod 1 is only within its first region 15 seals and forms with this a valve 33, 15. Within the second region 38 of the piston rod 1, the first sealing element 33 abuts only a part of the circumference of the piston rod 1.
  • a second sealing element 36 surrounding the piston rod 1 is arranged with respect to the first sealing element 33 on the side facing away from the working piston 17 and lies against the shoulder 37 of the stepped bore 34, 37.
  • the second sealing element 36 is designed and arranged in such a way that it seals the piston rod 1 both within its first region 15 and within its second region 38.
  • To enable by the second sealing element 36 this is designed so that it does not rest with its entire width on the circumference of the second region 38 of the piston rod 1, which is smaller in cross section, but only with an elastically deformable, lip-shaped part 3.
  • the part with a smaller diameter the stepped bore 34, 37 is adapted to the diameter of the first region 15 of the piston rod 1, so that there is a gap 2 between the piston rod bushing and the second region 38 of the piston rod 1, which is, however, sealed by the lip-shaped part 3 of the second sealing element 36, so that the pressure medium cannot escape through the gap 2 to the atmosphere from the piston rod-side pressure medium chamber 13.
  • the two sealing elements 36 and 33 enclose a valve chamber 35 formed from the stepped part 34 of the bore 34, 37.
  • a pressure medium connection 10 or 19 is provided on each of the two end walls of the working cylinder.
  • the two pressure medium connections 10, 19 are connected to a pressure medium source via a multi-way valve (not shown).
  • the pressure medium connection 10 is part of a quick exhaust valve, which has a sealing seat 9, an outlet seat 7 and a cantilevered valve closure member 8.
  • the pressure medium connection 19 is part of a quick exhaust valve, which has a sealing seat 20, an outlet seat 22 and a cantilevered valve closure member 21. Both quick exhaust valves 7, 8, 9 and 20, 21, 22 each have a pressure medium outlet 6 and 23 leading to the atmosphere.
  • the quick exhaust valve 7, 8, 9 assigned to the piston rod-side pressure medium chamber 13 is connected to the valve chamber 35 via a channel 4.
  • a throttle bore 11 serving as a bypass leads from the channel 4 to the pressure medium chamber 13.
  • the cross section of the throttle bore 11 can be changed by means of an adjusting screw 5.
  • the first region 15 of the piston rod 1 has a bore 30 which runs in the axial direction, penetrates the working piston 17 and is enclosed in its free end region by a sealing ring 31, which bore 30 cooperates in a plug-like manner with a mandrel 28 arranged on the end face closing the second pressure medium chamber 18 of the working cylinder.
  • the mandrel 28 has a longitudinal bore 29 through which the second pressure medium chamber 18 can be connected to a channel 24 and further to the pressure medium outlet 23 of the quick exhaust valve 20, 21, 22 leading to the atmosphere.
  • a throttle bore 26 establishes a permanent connection between the second pressure medium chamber 18 and the channel 24.
  • the cross section of the throttle bore 26 can be changed by means of an adjusting screw 25.
  • the working cylinder has a fastening eyelet 27 on its right end.
  • first pressure medium chamber 13 of the working cylinder is vented and the second pressure medium chamber 18 of the working cylinder is vented, so that the working piston 17 is in its right end position.
  • the mandrel 28 is received by the bore arranged in the first region 15 of the piston rod 1.
  • Pressure medium is present at the connection 10 of the quick exhaust valve 7, 8, 9 belonging to the first pressure medium chamber 13 and in the first pressure medium chamber 13.
  • the valve closure body 8 of the quick exhaust valve 7, 8, 9 is held by the pressure medium at the pressure medium connection 10 on the outlet seat 7, so that the pressure medium cannot escape from the first pressure medium chamber 13 via the pressure medium outlet 6.
  • the multi-way valve also not shown, which is arranged between the pressure medium source, not shown, and the pressure medium connections 10, 19 is switched over.
  • the second pressure medium chamber 18 is vented via the pressure medium connection 19, the quick exhaust valve 20, 21, 22 and the channel 24, the throttle bore 26 and the bore 29. At the same time, the pressure medium line leading to the pressure medium connection 10 is vented.
  • the pressure medium inlet (pressure medium connection 10) is now closed and the pressure medium outlet 6 is open.
  • the pressure medium from the first pressure medium chamber 13 quickly escapes to the atmosphere. If the piston rod 1 is extended so far from the working cylinder that the first region 15 of the piston rod 1 dips into the sealing element 33, so that the gap 12 between the first sealing element 33 and the piston rod 1 is closed, the pressure medium displaced from the first pressure medium chamber 13 arrives now only via the throttle bore 11 to the pressure medium outlet 6 of the quick exhaust valve 7, 8, 9.
  • the first region 15 of the piston rod 1 deforms the lip-shaped part 3 of the second sealing element 36 serving as a piston rod guide in the axial and radial direction and emerges from the working cylinder.
  • the pressure medium connection 10 of the quick exhaust valve 7, 8, 9 is connected to the pressure medium source and the line leading to the pressure medium connection 19 is vented. Due to the force of the pressure medium, the valve closure body 8 of the quick exhaust valve 7, 8, 9 is lifted off the sealing seat 9 and pressed against the outlet seat 7. The pressure medium flowing into the channel 4 through the quick exhaust valve 7, 8, 9 passes through the throttle bore 11 into the first pressure medium chamber 13, whereby a displacement of the working piston 17 in the direction of the second pressure medium chamber 18 is brought about. As soon as the first region of the piston rod 1 serving as the valve body has emerged from the first sealing element 33, the first pressure medium chamber 13 is additionally ventilated via the valve chamber 35 and the gap 12.
  • the pressure in the second pressure medium chamber 18 is first quickly reduced via the bore 29 provided in the mandrel 28 and the throttle bore 26 and the pressure medium outlet 23. As soon as the mandrel 28 is received by the bore 30 arranged in the working piston 17 and in the first region 15 of the piston rod 1, the pressure medium can only escape from the second pressure medium chamber 18 via the throttle bore 26. Consequently, the working piston 17 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)

Abstract

With a view to first rapid and then slowed pressure reduction in the piston rod-side pressure medium chamber (13), the latter can be directly connected to a pressure medium connection (10) and can also be connected to the same pressure medium connection via a valve. The valve is formed by a first sealing element arranged in the working cylinder and the piston rod, the piston rod (1) being divided into a first region (15) adjoining the working cylinder (17) and a second region (38) adjoining the first region (15). The first region (15) of the piston rod (1) has a greater cross-sectional area than the second region (38) and, with the first sealing element (33), forms the valve. A second sealing element (36) is arranged on the side of the first sealing element (33), which is directed away from the working cylinder (17). The first sealing element (33) seals exclusively against the first region (15) of the piston rod. The second sealing element (36) is designed in such a manner that it seals against both the first (15) and the second region (38) of the piston rod. <IMAGE>

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 stark zu verzögern. Dies ist z. B. bei automatischen Türschließeinrichtungen erforderlich.Such double-acting working cylinders with end deceleration are used wherever it is necessary to first transmit a rapid movement in two directions and then to decelerate the movement relatively strongly. This is e.g. B. required for automatic door locking devices.

Eine bekannte Einrichtung der vorstehend erwähnten Art (Türzylinder 422 802 Europa-Katalog der Firma WABCO Fahrzeugbremsen GmbH) ist derart aufgebaut, daß jede Kammer des doppeltwirkenden Arbeitszylinders beim Entlüften ständig mit einer ersten Entlüftung verbunden ist und über je ein Ventil mit einer zweiten Entlüftung mit relativ großem Querschnitt 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 die erste Entlüftung 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 constantly connected to a first vent during venting and relative to each with a second vent via a valve large cross section is connectable. 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 first vent.

Die beschriebene stufenweise Entlüftung erfolgt bei der kolbenstangenseitigen Kammer dadurch, daß die Kolbenstange abgestuft ist, wobei der dickere, dem Kolben zugewandte Bereich der Kolbenstange mit einer Zwischenwand des Zylinders das erwünschte Ventil für die Absperrung der zweiten Entlüftung von der kolbenstangenseitigen Kammer bildet.The stepwise ventilation described in the piston rod-side chamber takes place in that the piston rod is stepped, the thicker region of the piston rod facing the piston, with an intermediate wall of the cylinder, forming the desired valve for blocking the second ventilation from the piston rod side chamber.

Da bei dieser Anordnung die Kolbenstange abgestuft und die Druckdichtung für den dünneren Bereich der Kolbenstange bemessen ist, ist eine Verlängerung des Zylinders erforderlich, die den dickeren Bereich der Kolbenstange aufnehmen kann und die nicht für den Arbeitshub ausgenutzt werden kann.In this arrangement, since the piston rod is graduated and the pressure seal is dimensioned for the thinner area of the piston rod, an extension of the cylinder is required which can accommodate the thicker area of the piston rod and which cannot be used for the working stroke.

Der Erfindung liegt deshalb die Aufgabe zugrunde, eine Einrichtung der eingangs genannten Art zu schaffen, bei der die beschriebene Verlängerung des Zylinders mit einfachen Mitteln vermieden wird.The invention is therefore based on the object of providing a device of the type mentioned at the beginning in which the described extension of the cylinder is avoided with simple means.

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 werden in den Unteransprüchen aufgezeigt.Advantageous further developments and refinements of the invention are shown in the subclaims.

Die erfindungsgemäße Einrichtung zeichnet sich durch eine kompakte und kurze Bauweise des Arbeitszylinders aus.The device according to the invention is characterized by a compact and short construction of the working cylinder.

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

Die Abbildung zeigt einen doppelwirkenden Arbeitszylinder, dessen Kolbenstange Polygon-Profil aufweist, wobei die Kolbenstange mit einem entsprechend ausgebildeten Dichtelement ein Ventil bildet.The illustration shows a double-acting working cylinder, the piston rod of which has a polygonal profile, the piston rod forming a valve with a correspondingly designed sealing element.

In der Abbildung ist ein doppeltwirkender Arbeitszylinder dargestellt, welcher durch einen mit einer .Kolbenstange 1 versehenen Arbeitskolben 17 in eine kolbenstangenseitige erste Druckmittelkammer 13 und eine bezüglich der ersten Druckmittelkammer 13 auf der anderen Seite des Arbeitskolbens 17 angeordnete zweite Druckmittelkammer 18 unterteilt ist. Ein auf dem Umfang des Arbeitskolbens 17 angeordneter Dichtring 32 dichtet die erste Druckmittelkammer 13 gegen die zweite Druckmittelkammer 18 ab. Die Kolbenstange 1 ist polygonförmig ausgebildet und weist einen ersten, an den Arbeitskolben 17 angrenzenden Bereich 15 und einen zweiten im Querschnitt geringeren Bereich 38 bei gleichem Hüllkreis auf, welcher an den ersten Bereich 15 anschließt. In der kolbenstangenseitigen Stirnwand des Arbeitszylinders ist eine abgestufte Bohrung 34, 37 koaxial zum ersten Bereich 15 der Kolbenstange 1 angeordnet. Die Bohrung 34, 37 dient als Durchführung für die Kolbenstange 1: Im abgestuften Teil 34 der Bohrung 34, 37 ist ein erstes, die Kolbenstange 1 umgebendes Dichtelement 33 angeordnet, welches so ausgebildet ist, daß es die Kolbenstange 1 nur innerhalb ihres ersten Bereiches 15 abdichtet und mit diesem ein Ventil 33, 15 bildet. Innerhalb des zweiten Bereiches 38 der Kolbenstange 1 liegt das erste Dichtelement 33 nur an einen Teil des Umfanges der Kolbenstange 1 an.The figure shows a double-acting working cylinder which is divided by a working piston 17 provided with a piston rod 1 into a first pressure medium chamber 13 on the piston rod side and a second pressure medium chamber 18 arranged on the other side of the working piston 17 with respect to the first pressure medium chamber 13. A sealing ring 32 arranged on the circumference of the working piston 17 seals the first pressure medium chamber 13 against the second pressure medium chamber 18. The piston rod 1 is of polygonal design and has a first area 15 adjoining the working piston 17 and a second area 38 with a smaller cross section with the same enveloping circle, which adjoins the first area 15. A stepped bore 34, 37 is arranged coaxially to the first region 15 of the piston rod 1 in the end wall of the working cylinder on the piston rod side. The bore 34, 37 serves as a feedthrough for the piston rod 1: in the stepped part 34 of the bore 34, 37 there is a first sealing element 33 which surrounds the piston rod 1 and is designed such that the piston rod 1 is only within its first region 15 seals and forms with this a valve 33, 15. Within the second region 38 of the piston rod 1, the first sealing element 33 abuts only a part of the circumference of the piston rod 1.

Ein zweites die Kolbenstange 1 umgebendes Dichtelement 36 ist bezüglich des ersten Dichtelementes 33 auf der dem Arbeitskolben 17 abgewandten Seite angeordnet und liegt an der Schulter 37 der abgestuften Bohrung 34, 37 an. Das zweite Dichtelement 36 ist so ausgebildet und so angeordnet, daß es die Kolbenstange 1 sowohl innerhalb ihres ersten Bereiches 15 als auch innerhalb ihres zweiten Bereiches 38 abdichtet. Um den Durchtritt des ersten, im Querschnitt größeren Bereiches 15 der Kolbenstange 1 . durch das zweite Dichtelement 36 zu ermöglichen, ist diese so ausgebildet, daß es am Umfang des zweiten im Querschnitt geringeren Bereiches 38 der Kolbenstange 1 nicht mit seiner gesamten Breite anliegt, sondern lediglich mit einem elastisch verformbaren, lippenförmigen Teil 3. Der im Durchmesser kleinere Teil der abgestuften Bohrung 34, 37 ist dem Durchmesser des ersten Bereiches 15 der Kolbenstange 1 angepaßt, so daß zwischen der Kolbenstangendurchführung und dem zweiten Bereich 38 der Kolbenstange 1 ein Spalt 2 vorhanden ist, der jedoch vom lippenförmigen Teil 3 des zweiten Dichtelementes 36 abgedichtet wird, so daß aus der kolbenstangenseitigen Druckmittelkammer 13 das Druckmittel nicht durch den Spalt 2 zur Atmosphäre entweichen kann.A second sealing element 36 surrounding the piston rod 1 is arranged with respect to the first sealing element 33 on the side facing away from the working piston 17 and lies against the shoulder 37 of the stepped bore 34, 37. The second sealing element 36 is designed and arranged in such a way that it seals the piston rod 1 both within its first region 15 and within its second region 38. To the passage of the first area 15 of the piston rod 1, which is larger in cross section. To enable by the second sealing element 36, this is designed so that it does not rest with its entire width on the circumference of the second region 38 of the piston rod 1, which is smaller in cross section, but only with an elastically deformable, lip-shaped part 3. The part with a smaller diameter the stepped bore 34, 37 is adapted to the diameter of the first region 15 of the piston rod 1, so that there is a gap 2 between the piston rod bushing and the second region 38 of the piston rod 1, which is, however, sealed by the lip-shaped part 3 of the second sealing element 36, so that the pressure medium cannot escape through the gap 2 to the atmosphere from the piston rod-side pressure medium chamber 13.

Die beiden Dichtelemente 36 und 33 schließen eine aus dem abgestuften Teil 34 der Bohrung 34, 37 gebildete Ventilkammer 35 ein. An den beiden Stirnwänden des Arbeitszylinders ist je ein Druckmittelanschluß 10 bzw. 19 vorgesehen. Die beiden Druckmittelanschlüsse 10, 19 stehen über ein nicht dargestelltes Mehrwegeventil mit einer Druckmittelquelle in Verbindung. Der Druckmittelanschluß 10 ist Bestandteil eines Schnellentlüftungsventils, welches einen Dichtsitz 9, einen Auslaßsitz 7 sowie einen fliegend gelagerten Ventilverschlußkörper 8 aufweist. Ebenso ist der Druckmittelanschluß 19 Bestandteil eines Schnellentlüftungsventils, welches einen Dichtsitz 20, einen Auslaßsitz 22 sowie einen fliegend gelagerten Ventilverschlußkörper 21 aufweist. Beide Schnellentlüftungsventile 7, 8, 9 und 20, 21, 22 besitzen je einen zur Atmosphäre führenden Druckmittelauslaß 6 und 23. Das der kolbenstangenseitigen Druckmittelkammer 13 zugeordnete Schnellentlüftungsventil 7, 8, 9 ist über einen Kanal 4 mit der Ventilkammer 35 verbunden. Von dem Kanal 4 führt eine als Bypass dienende Drosselbohrung 11 zur Druckmittelkammer 13. Mittels einer Einstellschraube 5 ist der Querschnitt der Drosselbohrung 11 veränderbar. Der erste Bereich 15 der Kolbenstange 1 weist eine in axialer Richtung verlaufende, den Arbeitskolben 17 durchdringende und in ihrem freien Endbereich von einem Dichtring 31 eingefaßte Bohrung 30 auf, welche mit einem an der die zweite Druckmittelkammer 18 des Arbeitszylinders abschließenden Stirnseite angeordneten Dorn 28 steckerartig zusammenwirkt. Der Dorn 28 besitzt eine in Längsrichtung verlaufende Bohrung 29, über welche die zweite Druckmittelkammer 18 mit einem Kanal 24 und weiter mit dem zur Atmosphäre führenden Druckmittelauslaß 23 des Schnellentlüftungsventil 20, 21, 22 verbindbar ist. Eine Drosselbohrung 26 stellt eine ständige Verbindung zwischen der zweiten Druckmittelkammer 18 und dem Kanal 24 her. Der Querschnitt der Drosselbohrung 26 ist mittels einer Einstellschraube 25 veränderbar. An seiner rechten Stirnseite weist der Arbeitszylinder eine Befestigungsöse 27 auf.The two sealing elements 36 and 33 enclose a valve chamber 35 formed from the stepped part 34 of the bore 34, 37. A pressure medium connection 10 or 19 is provided on each of the two end walls of the working cylinder. The two pressure medium connections 10, 19 are connected to a pressure medium source via a multi-way valve (not shown). The pressure medium connection 10 is part of a quick exhaust valve, which has a sealing seat 9, an outlet seat 7 and a cantilevered valve closure member 8. Likewise, the pressure medium connection 19 is part of a quick exhaust valve, which has a sealing seat 20, an outlet seat 22 and a cantilevered valve closure member 21. Both quick exhaust valves 7, 8, 9 and 20, 21, 22 each have a pressure medium outlet 6 and 23 leading to the atmosphere. The quick exhaust valve 7, 8, 9 assigned to the piston rod-side pressure medium chamber 13 is connected to the valve chamber 35 via a channel 4. A throttle bore 11 serving as a bypass leads from the channel 4 to the pressure medium chamber 13. The cross section of the throttle bore 11 can be changed by means of an adjusting screw 5. The first region 15 of the piston rod 1 has a bore 30 which runs in the axial direction, penetrates the working piston 17 and is enclosed in its free end region by a sealing ring 31, which bore 30 cooperates in a plug-like manner with a mandrel 28 arranged on the end face closing the second pressure medium chamber 18 of the working cylinder. The mandrel 28 has a longitudinal bore 29 through which the second pressure medium chamber 18 can be connected to a channel 24 and further to the pressure medium outlet 23 of the quick exhaust valve 20, 21, 22 leading to the atmosphere. A throttle bore 26 establishes a permanent connection between the second pressure medium chamber 18 and the channel 24. The cross section of the throttle bore 26 can be changed by means of an adjusting screw 25. The working cylinder has a fastening eyelet 27 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 13 des Arbeitszylinders belüftet und die zweite Druckmittelkammer 18 des Arbeitszylinders entlüftet ist, so daß sich der Arbeitskolben 17 in seiner rechten Endlage befindet. Der Dorn 28 wird in dieser Endlage des Arbeitskolbens 17 von der im ersten Bereich 15 der Kolbenstange 1 angeordneten Bohrung aufgenommen. Am Anschluß 10 des zur ersten Druckmittelkammer 13 gehörigen Schnellentlüftungsventils 7, 8, 9 und in der ersten Druckmittelkammer 13 steht Druckmittel an. Der Ventil verschlußkörper 8 des Schnellentlüftungsventils 7, 8, 9 wird vom Druckmittel am Druckmittelanschluß 10 auf dem Auslaßsitz 7 gehalten, so daß das Druckmittel nicht über den Druckmittelauslaß 6 aus der ersten Druckmittelkammer 13 entweichen kann.It is assumed that the first pressure medium chamber 13 of the working cylinder is vented and the second pressure medium chamber 18 of the working cylinder is vented, so that the working piston 17 is in its right end position. In this end position of the working piston 17, the mandrel 28 is received by the bore arranged in the first region 15 of the piston rod 1. Pressure medium is present at the connection 10 of the quick exhaust valve 7, 8, 9 belonging to the first pressure medium chamber 13 and in the first pressure medium chamber 13. The valve closure body 8 of the quick exhaust valve 7, 8, 9 is held by the pressure medium at the pressure medium connection 10 on the outlet seat 7, so that the pressure medium cannot escape from the first pressure medium chamber 13 via the pressure medium outlet 6.

Soll der Arbeitskolben 17 in seine linke Endlage gebracht und die Kolbenstange 1 aus den Arbeitszylinder ausgefahren werden, so wird das zwischen der nicht gezeigten Druckmittelquelle und den Druckmittelanschlüssen 10, 19 angeordnete, ebenfalls nicht dargestellte Mehrwegeventil umgeschaltet.If the working piston 17 is to be brought into its left end position and the piston rod 1 is extended from the working cylinder, the multi-way valve, also not shown, which is arranged between the pressure medium source, not shown, and the pressure medium connections 10, 19 is switched over.

Über den Druckmittelanschluß 19, das Schnellentlüftungsventil 20, 21, 22 sowie den Kanal 24, die Drosselbohrung 26 und die Bohrung 29 wird die zweite Druckmittelkammer 18 belüftet. Gleichzeitig wird die zum Druckmittelanschluß 10 führende Druckmittelleitung entlüftet.The second pressure medium chamber 18 is vented via the pressure medium connection 19, the quick exhaust valve 20, 21, 22 and the channel 24, the throttle bore 26 and the bore 29. At the same time, the pressure medium line leading to the pressure medium connection 10 is vented.

Der Druckmitteleinlaß (Druckmittelanschluß 10) ist jetzt geschlossen, und der Druckmittelauslaß 6 ist geöffnet. Durch das geöffnete Ventil 12, 33, 15, die Drosselbohrung 11, den Kanal 4 und das Schnellentlüftungsventil 7, 8, 9 entweicht das Druckmittel aus der ersten Druckmittelkammer 13 zunächst schnell zur Atmosphäre. Ist die Kolbenstange 1 soweit aus dem Arbeitszylinder ausgefahren, daß der erste Bereich 15 der Kolbenstange 1 in das Dichtelement 33 eintaucht, so daß der Spalt 12 zwischen dem ersten Dichtelement 33 und der Kolbenstange 1 geschlossen ist, gelangt das aus der ersten Druckmittelkammer 13 verdrängte Druckmittel jetzt nur noch über die Drosselbohrung 11 zum Druckmittelauslaß 6 des Schnellentlüftungsventils 7, 8, 9.The pressure medium inlet (pressure medium connection 10) is now closed and the pressure medium outlet 6 is open. Through the opened valve 12, 33, 15, the throttle bore 11, the channel 4 and the quick exhaust valve 7, 8, 9, the pressure medium from the first pressure medium chamber 13 quickly escapes to the atmosphere. If the piston rod 1 is extended so far from the working cylinder that the first region 15 of the piston rod 1 dips into the sealing element 33, so that the gap 12 between the first sealing element 33 and the piston rod 1 is closed, the pressure medium displaced from the first pressure medium chamber 13 arrives now only via the throttle bore 11 to the pressure medium outlet 6 of the quick exhaust valve 7, 8, 9.

Dadurch, daß das Druckmittel jetzt nur noch gedrosselt aus der ersten Druckmittelkammer 13 entweichen kann, wird die Bewegung des Arbeitskolbens 17 in Richtung auf seine linke Endstellung zu verlangsamt.Because the pressure medium can now only escape throttled from the first pressure medium chamber 13, the movement of the working piston 17 in the direction of its left end position is slowed down.

Bei der weiteren Verschiebung des Arbeitskolbens 17 in Richtung auf die erste Druckmittelkammer 13 zu verformt der erste Bereich 15 der Kolbenstange 1 den lippenförmigen Teil 3 des als Kolbenstangenführung dienenden zweiten .Dichtelementes 36 in axialer und radialer Richtung und tritt aus den Arbeitszylinder aus.Upon further displacement of the working piston 17 in the direction of the first pressure medium chamber 13, the first region 15 of the piston rod 1 deforms the lip-shaped part 3 of the second sealing element 36 serving as a piston rod guide in the axial and radial direction and emerges from the working cylinder.

Soll die Kolbenstange 1 wieder in den Arbeitszylinder eingefahren werden, so wird der Druckmittelanschluß 10 des Schnellentlüftungsventils 7, 8, 9 mit der Druckmittelquelle verbunden und die zum Druckmittelanschluß 19 führende Leitung entlüftet. Durch die Kraft des Druckmittels wird der Ventilverschlußkörper 8 des Schnellentlüftungsventils 7, 8, 9 vom Dichtsitz 9 abgehoben und gegen den Auslaßsitz 7 gedrückt. Das durch das Schnellentlüftungsventil 7, 8, 9 in den Kanal 4 einströmende Druckmittel gelangt durch die Drosselbohrung 11 in die erste Druckmittelkammer 13, wodurch eine Verschiebung des Arbeitskolbens 17 in Richtung auf die zweite Druckmittelkammer 18 zu bewirkt wird. Sobald der als Ventilkörper dienende erste Bereich der Kolbenstange 1 aus dem ersten Dichtelement 33 ausgetreten ist, wird die erste Druckmittelkammer 13 zusätzlich über die Ventilkammer 35 und den Spalt 12 belüftet. Der Druck in der zweiten Druckmittelkammer 18 wird zuerst über die im Dorn 28 vorgesehene Bohrung 29 und die Drosselbohrung 26 sowie den Druckmittelauslaß 23 schnell abgebaut. Sobald der Dorn 28 von der im Arbeitskolben 17 sowie in dem ersten Bereich 15 der Kolbenstange 1 angeordneten Bohrung 30 aufgenommen wird, kann das Druckmittel nur noch über die Drosselbohrung 26 aus der zweiten Druckmittelkammer 18 entweichen. Folglich fährt der Arbeitskolben 17 jetzt verlangsamt bis in seine rechte Endlage.If the piston rod 1 is to be retracted into the working cylinder, the pressure medium connection 10 of the quick exhaust valve 7, 8, 9 is connected to the pressure medium source and the line leading to the pressure medium connection 19 is vented. Due to the force of the pressure medium, the valve closure body 8 of the quick exhaust valve 7, 8, 9 is lifted off the sealing seat 9 and pressed against the outlet seat 7. The pressure medium flowing into the channel 4 through the quick exhaust valve 7, 8, 9 passes through the throttle bore 11 into the first pressure medium chamber 13, whereby a displacement of the working piston 17 in the direction of the second pressure medium chamber 18 is brought about. As soon as the first region of the piston rod 1 serving as the valve body has emerged from the first sealing element 33, the first pressure medium chamber 13 is additionally ventilated via the valve chamber 35 and the gap 12. The pressure in the second pressure medium chamber 18 is first quickly reduced via the bore 29 provided in the mandrel 28 and the throttle bore 26 and the pressure medium outlet 23. As soon as the mandrel 28 is received by the bore 30 arranged in the working piston 17 and in the first region 15 of the piston rod 1, the pressure medium can only escape from the second pressure medium chamber 18 via the throttle bore 26. Consequently, the working piston 17 now slows down to its right end position.

Claims (7)

1. Einrichtung zur Endabbremsung des Arbeitskolbens eines doppeltwirkenden Arbeitszylinders, welcher die folgenden Merkmale aufweist: a) Der Arbeitszylinder ist durch den mit einer Kolbenstange (1 ) versehenen Arbeitskolben (17) in eine kolbenstangenseitige erste Druckmittelkammer (13) und eine bezüglich der ersten Druckmittelkammer (13) auf der anderen Seite des Arbeitskolbens angeordnete zweite Druckmittelkammer (18) unterteilt; b) zur Be- und Entlüftung einer der beiden Druckmittelkammern ist ein erster Druckmittelanschluß vorgesehen; c) die dem ersten Druckmittelanschluß zugeordnete Druckmittelkammer ist direkt mit dem ersten Druckmittelanschluß verbindbar; d) die dem ersten Druckmittelanschluß zugeordnete Druckmittelkammer ist zusätzlich über ein Ventil mit dem ersten Druckmittelanschluß verbindbar; e) das Ventil ist so angeordnet und so ausgebildet, daß beim Entlüften der Druckmittelkammer zunächst das Ventil geöffnet und nach Erreichen einer vorgegebenen Position durch den Arbeitskolben das Ventil geschlossen ist; f) die Kolbenstange (1) weist einen ersten, an den Arbeitskolben (17) angrenzenden Bereich (15) und einen zweiten, an den ersten Bereich (15) anschließenden und sich zum freien Ende der Kolbenstange (1) hin erstreckenden Bereich (38) auf; g) es ist ein erstes, die Kolbenstange (1) umgebendes Dichtelement (33) vorgesehen, das so ausgebildet ist, daß es die Kolbenstange (1) nur innerhalb ihres ersten Bereiches (15) abdichtet; h) es ist ein zweites, die Kolbenstange (1) umgebendes Dichtelement (36) vorgesehen, das bezüglich des ersten Dichtelementes (33) auf der dem Arbeitskolben (17) abgewandten Seite liegt; dadurch gekennzeichnet, daß das zweite Dichtelement (36) so angeordnet ist und so ausgebildet ist, daß es die Kolbenstange (1) sowohl innerhalb ihres ersten Bereiches (15) als auch innerhalb ihres zweiten Bereiches (38) abdichtet. 1. Device for the final braking of the working piston of a double-acting working cylinder, which has the following features: a) The working cylinder is divided by the working piston (1) provided with a piston rod (1) into a first pressure medium chamber (13) on the piston rod side and a second pressure medium chamber (18) arranged on the other side of the working piston with respect to the first pressure medium chamber (13); b) a first pressure medium connection is provided for ventilation of one of the two pressure medium chambers; c) the pressure medium chamber assigned to the first pressure medium connection can be connected directly to the first pressure medium connection; d) the pressure medium chamber assigned to the first pressure medium connection can additionally be connected to the first pressure medium connection via a valve; e) the valve is arranged and designed such that when the pressure medium chamber is vented, the valve is first opened and, after reaching a predetermined position, the valve is closed by the working piston; f) the piston rod (1) has a first region (15) adjacent to the working piston (17) and a second region (38) adjoining the first region (15) and extending towards the free end of the piston rod (1) on; g) a first sealing element (33) surrounding the piston rod (1) is provided, which is designed in such a way that it seals the piston rod (1) only within its first region (15); h) a second sealing element (36) surrounding the piston rod (1) is provided, which is located on the side facing away from the working piston (17) with respect to the first sealing element (33); characterized in that the second sealing element (36) is arranged and is designed such that it seals the piston rod (1) both within its first region (15) and within its second region (38). 2. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Kolbenstange (1) in ihrem zweiten Bereich (38) eine kleinere Querschnittsfläche aufweist als in ihrem ersten Bereich (15) bei gleichem Hüllkreis.2. Device according to claim 1, characterized in that the piston rod (1) in its second region (38) has a smaller cross-sectional area than in its first region (15) with the same enveloping circle. 3. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das zweite Dichtelement (36) so ausgebildet ist, daß es zur druckdichten Führung der Kolbenstange (1) innerhalb beider Bereiche (15, 38) dient.3. Device according to claim 1, characterized in that the second sealing element (36) is designed such that it serves for pressure-tight guidance of the piston rod (1) within both areas (15, 38). 4. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das erste Dichtelement (33) so ausgebildet ist, daß es zur druckdichten Führung der Kolbenstange (1) innerhalb ihres ersten Bereiches (15) dient.4. Device according to claim 1, characterized in that the first sealing element (33) is designed such that it serves for pressure-tight guidance of the piston rod (1) within its first region (15). 5. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Querschnitt der Kolbenstange (1) innerhalb ihres zweiten Bereiches (38) so ausgebildet ist, daß die Kolbenstange (1) innerhalb des zweiten Bereiches (38) ständig auf einen Teil ihres Umfanges von dem ersten Dichtelement (33) geführt ist.5. Device according to claim 1, characterized in that the cross section of the piston rod (1) within its second region (38) is formed such that the piston rod (1) within the second region (38) constantly on a part of its circumference from that first sealing element (33) is guided. 6. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Kolbenstange (1) Polygon-Profil aufweist.6. Device according to claim 1, characterized in that the piston rod (1) has a polygonal profile. 7. Einrichtung nach Anspruch 1 und 2, dadurch gekennzeichnet, daß die Kolbenstange (1) innerhalb ihres zweiten Bereiches (38) gedrillt ausgebildet ist.7. Device according to claim 1 and 2, characterized in that the piston rod (1) is drilled within its second region (38).
EP82109146A 1981-11-26 1982-10-04 End-of-stroke cushioning device for a piston of a double acting cylinder Withdrawn EP0080579A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3146845 1981-11-26
DE19813146845 DE3146845A1 (en) 1981-11-26 1981-11-26 DEVICE FOR STOPPING THE WORKING PISTON OF A DOUBLE-ACTING WORK CYLINDER

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EP0080579A1 true EP0080579A1 (en) 1983-06-08

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EP82109146A Withdrawn EP0080579A1 (en) 1981-11-26 1982-10-04 End-of-stroke cushioning device for a piston of a double acting cylinder

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EP0199556A1 (en) * 1985-04-20 1986-10-29 Colt International Limited Pneumatic actuator
FR2641342A1 (en) * 1989-01-04 1990-07-06 Roux Roger FLUID ACTUATOR
EP0450518A1 (en) * 1990-04-05 1991-10-09 Knorr-Bremse Ag Compressed air actuator
EP0622331A1 (en) * 1993-03-19 1994-11-02 FIAT OM CARRELLI ELEVATORI S.p.A. A lifting unit for the forks of lift trucks
GB2282414A (en) * 1993-08-25 1995-04-05 Blatchford & Sons Ltd Artificial limb component
WO2011085283A1 (en) 2010-01-11 2011-07-14 Faro Technologies, Inc. Method and apparatus for synchronizing measurements taken by multiple metrology devices

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DE29615799U1 (en) * 1996-09-11 1996-10-31 Festo Kg, 73734 Esslingen End position damping device
TW468005B (en) * 1998-11-06 2001-12-11 Smc Corp Pneumatic cylinder with cushion mechanism
JP3469525B2 (en) * 2000-03-03 2003-11-25 Ｓｍｃ株式会社 Pneumatic rotary actuator with cushion mechanism
DE202004011993U1 (en) * 2004-07-30 2005-12-08 Liebherr-Werk Nenzing Ges.M.B.H. Damping system especially for hydraulic cylinders has a coaxial construction with progressive restriction of the connection between the supply duct and the pressure side of the piston
CN106224325A (en) * 2016-08-25 2016-12-14 北汽福田汽车股份有限公司 Plunger case, pumping system pendulum valve system and concrete pumping equipment

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0199556A1 (en) * 1985-04-20 1986-10-29 Colt International Limited Pneumatic actuator
FR2641342A1 (en) * 1989-01-04 1990-07-06 Roux Roger FLUID ACTUATOR
EP0377529A1 (en) * 1989-01-04 1990-07-11 Roger Roux Fluid-pressure actuator
EP0450518A1 (en) * 1990-04-05 1991-10-09 Knorr-Bremse Ag Compressed air actuator
EP0622331A1 (en) * 1993-03-19 1994-11-02 FIAT OM CARRELLI ELEVATORI S.p.A. A lifting unit for the forks of lift trucks
GB2282414A (en) * 1993-08-25 1995-04-05 Blatchford & Sons Ltd Artificial limb component
WO2011085283A1 (en) 2010-01-11 2011-07-14 Faro Technologies, Inc. Method and apparatus for synchronizing measurements taken by multiple metrology devices

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