EP0193908B1 - Valve device for positioning a piston-cylinder-device - Google Patents

Valve device for positioning a piston-cylinder-device Download PDF

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Publication number
EP0193908B1
EP0193908B1 EP19860102725 EP86102725A EP0193908B1 EP 0193908 B1 EP0193908 B1 EP 0193908B1 EP 19860102725 EP19860102725 EP 19860102725 EP 86102725 A EP86102725 A EP 86102725A EP 0193908 B1 EP0193908 B1 EP 0193908B1
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EP
European Patent Office
Prior art keywords
valve
piston
cylinder
spring
control spring
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Expired
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EP19860102725
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German (de)
French (fr)
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EP0193908A1 (en
Inventor
Rolf Stahl
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Herion Werke KG
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Herion Werke KG
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Publication of EP0193908A1 publication Critical patent/EP0193908A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B9/00—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member
    • F15B9/02—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type
    • F15B9/08—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type controlled by valves affecting the fluid feed or the fluid outlet of the servomotor
    • F15B9/09—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type controlled by valves affecting the fluid feed or the fluid outlet of the servomotor with electrical control means

Definitions

  • the invention relates to a valve device for displacement control of a piston-cylinder unit, with a pressure control valve, the valve piston z. B. can be controlled by a proportional magnet and via which the cylinder piston can be acted upon with a pressure medium, wherein a cooperating with the valve piston, designed as a helical compression spring is arranged between the cylinder piston and one end of the valve piston.
  • a hydraulic adjusting device in which a piston-cylinder unit is actuated by a control valve controlled by a proportional magnet.
  • a control spring is operatively connected to the piston of the pressure control valve via the armature of the proportional magnet.
  • the armature is axially displaced, the control spring, which abuts the armature with one end face, being loaded and acted upon by the armature essentially over its entire circumference.
  • the known actuating device in which the valve and the proportional magnet are integrated in the housing of the piston-cylinder unit, is structurally relatively complex.
  • the invention is based on the object of further developing a valve device of the type mentioned in such a way that with a structurally simple structure, even with an eccentric installation of the pressure control valve and the proportional magnet in the piston-cylinder unit, a secure operative connection between the control spring and the piston of the pressure control valve is created becomes.
  • the pressure control valve is designed as an independent, ready-to-install unit which is attached to or in the cylinder of the piston-cylinder unit in such a way that the control spring is acted upon asymmetrically by the valve piston.
  • Fig. 1 shows the valve device 10 with a pressure control valve 12 which is controlled by a proportional magnet 14.
  • the valve has an inlet connection 16, a return connection 18 and a consumer connection 20.
  • the pressure control valve 12 is combined with a piston-cylinder unit, consisting of a cylinder 22 and a piston 24 axially movable therein, which is fixedly connected to a piston rod 26 which extends through the housing of the cylinder 22 to the outside for actuating any device not shown.
  • the pressure control valve 12 can be fastened to the cylinder 22 in a suitable manner, but it can also be expediently installed directly in the cylinder 22, as shown in FIG. 1.
  • the consumer port 20 of the pressure control valve 12 is connected via a line 28 to a chamber 30 in the cylinder 22, such that the pressure medium can be supplied from the consumer port 20 of the pressure control valve 12 via line 28 to the chamber 30 to the lower end face in FIG. 1 to apply pressure to the piston 24.
  • a compression spring 32 which surrounds the piston rod 26 and which serves to push the piston 24 into the zero position shown in FIG. 1 or Home position to press.
  • Another compression spring which forms a control spring 34 and surrounds the first compression spring 32 practically concentrically, but this need not be the case, is installed between the upper end face of the piston 24 and the cylinder 22 in FIG. 1.
  • control spring 34 is supported on the piston 24, while the other end of the control spring 34 is supported in an annular groove 74 which is formed in the cylinder 22 and, in the embodiment shown, is concentric with the central axis 76 of the piston-cylinder -Aggregates is arranged.
  • a support ring 36 is located in the annular groove between the groove base and the control spring 34 for more uniform power transmission.
  • the annular groove 74 is interrupted in the region of the pressure control valve 12 in such a way that the support ring 36 can be acted upon axially by an end piece 58 of the valve piston 52 (FIG. 2).
  • the end piece 58 lies here directly or via a cap 60 on the support ring 36.
  • Fig. 2 shows in section the pressure control valve 12, which is installed in a bore 78 of the cylinder 22 in the embodiment shown.
  • the bore 78 runs practically parallel to the central axis 76 of the cylinder 22 and it extends, as shown in FIG. 2 in particular, to the annular groove 74, so that the bore 78 is in direct connection with the annular groove 74 and therefore in the region of the bore 78 Ring groove 74 has no bottom, so that the control spring 34 can be acted upon by the valve piston 52 via the end piece 58 and the cap 60 via the support ring 36.
  • the pressure control valve 12 has a housing 38, which in the embodiment shown is part of the cylinder 22.
  • a guide bushing 4.0 and a guide bushing 42 are arranged axially one behind the other in the housing 38.
  • a valve bushing 44 is axially guided in the guide bushing 40, and a valve disk 46 is screwed onto the lower, shaft-shaped end in FIG. 2, which is provided with a thread.
  • the valve plate 46 interacts with a valve seat 48 formed on the guide bush 40.
  • a compression spring 50 which sits between the valve plate 46 and the guide bush 42, the valve plate 46 is constantly pressed in the closing direction against its valve seat 48.
  • valve piston 52 is acted upon by the armature 54 of the proportional magnet 14 in the axial direction (whereby other devices for acting on and adjusting the valve piston 52 can also be provided instead of the proportional magnet).
  • the valve piston 52 has a valve disk 64 which interacts with a valve seat 66 formed on the valve sleeve 44.
  • the valve piston 52 also has an elongated stem 56 of smaller diameter that extends through a central axial bore 62 formed in the valve sleeve 44. Between the shaft 56 and the inner wall of the bore 62, an annular space is formed through which the pressure medium, as will be explained, can flow to the outlet or return connection 18.
  • An end piece 58 adjoins the shaft 56, which is also part of the valve piston 52 and has a larger diameter than the shaft 56 and is guided axially in the guide bush 42.
  • the end piece 58 can abut directly on the support ring 36, but in the embodiment shown a cap 60 sits on the end piece 58, which in turn rests on the support ring 36.
  • annular chamber 68 is formed, which is connected to the inlet connection 16.
  • a seal 70 is arranged between the guide sleeve 40 and the valve sleeve 44 and a seal 72 is arranged between the guide sleeve 42 and the end piece 58 of the valve piston.
  • the device according to the invention works as follows:
  • the piston 24 of the piston-cylinder unit is in its basic position, as shown in FIG. 1.
  • the cylinder 22, or its chamber 30, is vented via the line 28, the consumer connection 20, the bore 62 and the open valve seat 66 to the outlet or return connection 18.
  • the valve seat 48 is closed by the valve plate 46 and thus the inlet port 16 is blocked.
  • valve piston 52 If the proportional magnet 14 is now energized, an axial force is exerted on the valve piston 52 via its armature 54, which moves axially downward (based on FIG. 2) and initially closes the valve seat 66, whereby the outlet 18 is blocked.
  • the valve sleeve 44 is carried along with a further axial movement and likewise moved axially downward, as a result of which the valve disk 46 is lifted off the valve seat 48 and the latter is opened.
  • the pressure medium can then flow from the inlet connection 16 via the annular chamber 68 and the opened valve seat 48 to the consumer connection 20 and from there via the line 28 into the chamber 30 of the cylinder 22.
  • the support ring 36 Due to the axial displacement of the valve piston 52, the support ring 36 is acted upon via its end piece 58 and the cap 60 and is raised by the amount of the axial displacement of the valve piston 52 from a basic position in the direction of and against the force of the spring 34.
  • the pressure medium in the chamber 30 acts on the end face 82 of the piston 24 and moves the latter against the force of the springs 32 and 34 upward (with reference to FIG. 1), whereby the spring 34 (and the spring 32) is tensioned.
  • the control spring 34 now exerts a force on the support ring 36 which is proportional to the path of the piston 24. This force is transmitted via the cap 60 to the valve piston 58, 52 and from there to the armature 54 of the proportional magnet 14.
  • valve piston 52 is shifted slightly upward (with reference to FIG. 2), the valve sleeve 44 following this movement, since its valve disk 46 is acted upon by the compression spring 50 in the closing direction of the valve seat 48.
  • the opening cross section of the valve seat 48 is reduced, with the result that less pressure medium can flow in from the inlet connection 16.
  • valve piston 52 The upward movement of the valve piston 52 continues until a force equilibrium is established between the forces exerted on the valve piston 52 by the control spring 34 on the one hand and by the proportional magnet 14 on the other hand.
  • the stroke of the piston 24 is thus directly proportional to the setting or the excitation of the proportional magnet 14.
  • the control is practically independent of pressure fluctuations in the pressure medium and independent of frictional forces.

Description

Die Erfindung betrifft eine Ventilvorrichtung zur Wegeregelung einer Kolben-Zylinder-Einheit, mit einem Druckregelventil, dessen Ventilkolben z. B. durch einen Proportional-Magneten ansteuerbar ist und über das der Zylinderkolben mit einem Druckmittel beaufschlagbar ist, wobei zwischen dem Zylinderkolben und einem Ende des Ventilkolbens eine mit dem Ventilkolben zusammenwirkende, als Schraubendruckfeder ausgebildete Regelfeder angeordnet ist.The invention relates to a valve device for displacement control of a piston-cylinder unit, with a pressure control valve, the valve piston z. B. can be controlled by a proportional magnet and via which the cylinder piston can be acted upon with a pressure medium, wherein a cooperating with the valve piston, designed as a helical compression spring is arranged between the cylinder piston and one end of the valve piston.

Aus der WO-A-81/02185 ist eine hydraulische Stellvorrichtung bekannt, bei der ein Kolben-Zylinder-Aggregat durch ein von einem Proportionalmagneten angesteuertes Regelventil betätigt wird. Eine Regelfeder steht über den Anker des Proportionalmagneten in Wirkverbindung mit dem Kolben des Druckregelventiles. Während der Einregelung wird der Anker axial verschoben, wobei die Regelfeder, die mit ihrer einen Stirnseite stumpf an dem Anker anliegt, im wesentlichen über ihren gesamten Umfang durch den Anker belastet und beaufschlagt.From WO-A-81/02185 a hydraulic adjusting device is known, in which a piston-cylinder unit is actuated by a control valve controlled by a proportional magnet. A control spring is operatively connected to the piston of the pressure control valve via the armature of the proportional magnet. During the adjustment, the armature is axially displaced, the control spring, which abuts the armature with one end face, being loaded and acted upon by the armature essentially over its entire circumference.

Die bekannte Stellvorrichtung, bei der das Ventil und der Proportionalmagnet in das Gehäuse des Kolben-Zylinder-Aggregates integriert sind, ist konstruktiv relativ aufwendig.The known actuating device, in which the valve and the proportional magnet are integrated in the housing of the piston-cylinder unit, is structurally relatively complex.

Der Erfindung liegt demgegenüber die Aufgabe zugrunde, eine Ventilvorrichtung der eingangs genannten Art derart weiterzubilden, daß bei konstruktiv einfachem Aufbau auch bei exzentrischem Einbau des Druckregelventiles und des Proportionalmagneten in die Kolben-Zylinder-Einheit eine sichere Wirkverbindung zwischen der Regelfeder und dem Kolben des Druckregelventils geschaffen wird.The invention is based on the object of further developing a valve device of the type mentioned in such a way that with a structurally simple structure, even with an eccentric installation of the pressure control valve and the proportional magnet in the piston-cylinder unit, a secure operative connection between the control spring and the piston of the pressure control valve is created becomes.

Nach der Erfindung wird dies dadurch erreicht, daß das Druckregelventil als eigenständige, einbaufertige Einheit ausgebildet ist, die am bzw. im Zylinder der Kolben-Zylinder-Einheit derart befestigt ist, daß die Regelfeder durch den Ventilkolben asymmetrisch beaufschlagt ist.According to the invention, this is achieved in that the pressure control valve is designed as an independent, ready-to-install unit which is attached to or in the cylinder of the piston-cylinder unit in such a way that the control spring is acted upon asymmetrically by the valve piston.

Weitere Merkmale der Erfindung ergeben sich aus den Unteransprüchen. Eine beispielsweise Ausführungsform der Erfindung wird nachfolgend anhand der Zeichnung erläutert, in der

  • Fig. 1 teilweise im Schnitt eine Ventilvorrichtung mit einem Druckregelventil und einer Kolben-Zylinder-Einheit zeigt.
  • Fig. 2 zeigt einen Schnitt durch das Druckregelventil nach Fig. 1.
Further features of the invention emerge from the subclaims. An example embodiment of the invention is explained below with reference to the drawing in which
  • Fig. 1 shows partially in section a valve device with a pressure control valve and a piston-cylinder unit.
  • FIG. 2 shows a section through the pressure control valve according to FIG. 1.

Fig. 1 zeigt die Ventilvorrichtung 10 mit einem Druckregelventil 12, das durch einen Proportionalmagneten 14 angesteuert ist. Das Ventil hat einen Zulaufanschluß 16, einen Rücklaufanschluß 18 und einen Verbraucheranschluß 20. Als Druckmittel wird z. B. Luft verwendet.Fig. 1 shows the valve device 10 with a pressure control valve 12 which is controlled by a proportional magnet 14. The valve has an inlet connection 16, a return connection 18 and a consumer connection 20. B. air used.

Das Druckregelventil 12 ist zusammengefaßt mit einer Kolben-Zylinder-Einheit, bestehend aus einem Zylinder 22 und einem in diesem axial bewegbaren Kolben 24, der fest mit einer Kolbenstange 26 verbunden ist, die sich durch das Gehäuse des Zylinders 22 nach außen erstreckt zur Betätigung irgendeines nicht-gezeigten Gerätes.The pressure control valve 12 is combined with a piston-cylinder unit, consisting of a cylinder 22 and a piston 24 axially movable therein, which is fixedly connected to a piston rod 26 which extends through the housing of the cylinder 22 to the outside for actuating any device not shown.

Das Druckregelventil 12 kann in geeigneter Weise am Zylinder 22 befestigt sein, es kann aber auch zweckmäßigerweise direkt in den Zylinder 22 eingebaut sein, wie in Fig. 1 dargestellt ist.The pressure control valve 12 can be fastened to the cylinder 22 in a suitable manner, but it can also be expediently installed directly in the cylinder 22, as shown in FIG. 1.

Der Verbraucheranschluß 20 des Druckregelventils 12 ist über eine Leitung 28 mit einer Kammer 30 im Zylinder 22 verbunden, derart, daß das Druckmittel vom Verbraucheranschluß 20 des Druckregelventils 12 über die Leitung 28 der Kammer 30 zugeführt werden kann, um die in Fig. 1 untere Stirnfläche des Kolbens 24 mit dem Druckmittel zu beaufschlagen.The consumer port 20 of the pressure control valve 12 is connected via a line 28 to a chamber 30 in the cylinder 22, such that the pressure medium can be supplied from the consumer port 20 of the pressure control valve 12 via line 28 to the chamber 30 to the lower end face in FIG. 1 to apply pressure to the piston 24.

Zwischen dem Gehäuse des Zylinders 22 und der in Fig. 1 oberen Stirnfläche des Kolbens 22 ist eine Druckfeder 32 angeordnet, welche die Kolbenstange 26 umschließt und die dazu dient, den Kolben 24 in die in Fig. 1 dargestellte Null-Stel-lung bzw. Grundstellung zu drücken.Between the housing of the cylinder 22 and the upper end face of the piston 22 in FIG. 1 there is a compression spring 32 which surrounds the piston rod 26 and which serves to push the piston 24 into the zero position shown in FIG. 1 or Home position to press.

Eine weitere Druckfeder, die eine Regelfeder 34 bildet und die erste Druckfeder 32 praktisch konzentrisch umgibt, was aber nicht der Fall zu sein braucht, ist zwischen der in Fig. 1 oberen Stirnfläche des Kolbens 24 und dem Zylinder 22 eingebaut.Another compression spring, which forms a control spring 34 and surrounds the first compression spring 32 practically concentrically, but this need not be the case, is installed between the upper end face of the piston 24 and the cylinder 22 in FIG. 1.

Das eine Ende der Regelfeder 34 stützt sich, wie erwähnt, am Kolben 24 ab, während das andere Ende der Regelfeder 34 in einer Ringnut 74 abgestützt ist, die im Zylinder 22 ausgebildet ist und in der dergestellten Ausführungsform konzentrisch zur Mittelachse 76 des Kolben-Zylinder-Aggregates angeordnet ist.As mentioned, one end of the control spring 34 is supported on the piston 24, while the other end of the control spring 34 is supported in an annular groove 74 which is formed in the cylinder 22 and, in the embodiment shown, is concentric with the central axis 76 of the piston-cylinder -Aggregates is arranged.

In der Ringnut liegt zwischen dem Nutgrund und der Regelfeder 34 zur gleichmäßigeren Kraftübertragung ein Stützring 36.A support ring 36 is located in the annular groove between the groove base and the control spring 34 for more uniform power transmission.

Die Ringnut 74 ist, wie in Fig. 1 dargestellt, im Bereich des Druckregelventiles 12 unterbrochen, derart, daß der Stützring 36 durch ein Endstück 58 des Ventilkolbens 52 (Fig. 2) axial beaufschlagt werden kann.The annular groove 74, as shown in FIG. 1, is interrupted in the region of the pressure control valve 12 in such a way that the support ring 36 can be acted upon axially by an end piece 58 of the valve piston 52 (FIG. 2).

Das Endstück 58 liegt hierbei direkt oder über eine Kappe 60 an dem Stützring 36 an.The end piece 58 lies here directly or via a cap 60 on the support ring 36.

Fig. 2 zeigt im Schnitt das Druckregelventil 12, das in der dargestellten Ausführungsform in eine Bohrung 78 des Zylinders 22 eingebaut ist.Fig. 2 shows in section the pressure control valve 12, which is installed in a bore 78 of the cylinder 22 in the embodiment shown.

Die Bohrung 78 verläuft praktisch parallel zur Mittelachse 76 des Zylinders 22 und sie erstreckt sich, wie insbesondere Fig. 2 zeigt, bis zur Ringnut 74, so daß die Bohrung 78 in direkter Verbindung mit der Ringnut 74 steht und daher im Bereich der Bohrung 78 die Ringnut 74 keinen Boden hat, so daß über den Stützring 36 die Regelfeder 34 durch den Ventilkolben 52 über dessen Endstück 58 und die Kappe 60 beaufschlagt werden kann.The bore 78 runs practically parallel to the central axis 76 of the cylinder 22 and it extends, as shown in FIG. 2 in particular, to the annular groove 74, so that the bore 78 is in direct connection with the annular groove 74 and therefore in the region of the bore 78 Ring groove 74 has no bottom, so that the control spring 34 can be acted upon by the valve piston 52 via the end piece 58 and the cap 60 via the support ring 36.

Das Druckregelventil 12 hat ein Gehäuse 38, das in der dargestellten Ausführungsform ein Teil des Zylinders 22 ist.The pressure control valve 12 has a housing 38, which in the embodiment shown is part of the cylinder 22.

Im Gehäuse 38 sind axial hintereinander eine Führungsbüchse 4.0 und eine Führungsbüchse 42 angeordnet.A guide bushing 4.0 and a guide bushing 42 are arranged axially one behind the other in the housing 38.

In der Führungsbüchse 40 ist eine Ventilbüchse 44 axial geführt, auf deren in Fig. 2 unteres, schaftförmiges Ende, das mit Gewinde versehen ist, ein Ventilteller46 geschraubt ist. Der Ventilteller 46 wirkt mit einem an der Führungsbüchse 40 ausgebildeten Ventilsitz 48 zusammen. Mittels einer Druckfeder 50, die zwischen dem Ventilteller 46 und der Führungsbüchse 42 sitzt, wird der Ventilteller 46 ständig in Schließrichtung gegen seinen Ventilsitz 48 gedrückt.A valve bushing 44 is axially guided in the guide bushing 40, and a valve disk 46 is screwed onto the lower, shaft-shaped end in FIG. 2, which is provided with a thread. The valve plate 46 interacts with a valve seat 48 formed on the guide bush 40. By means of a compression spring 50, which sits between the valve plate 46 and the guide bush 42, the valve plate 46 is constantly pressed in the closing direction against its valve seat 48.

Der Ventilkolben 52 wird durch den Anker 54 des Proportionalmagneten 14 in axialer Richtung beaufsghlagt (wobei anstelle des Proportionalmagneten auch andere Einrichtungen zur Beaufschlagung und Einstellung des Ventilkolbens 52 vorgesehen werden können).The valve piston 52 is acted upon by the armature 54 of the proportional magnet 14 in the axial direction (whereby other devices for acting on and adjusting the valve piston 52 can also be provided instead of the proportional magnet).

Der Ventilkolben 52 hat einen Ventilteller 64, der mit einem an der Ventilbüchse 44 ausgebildeten Ventilsitz 66 zusammenwirkt.The valve piston 52 has a valve disk 64 which interacts with a valve seat 66 formed on the valve sleeve 44.

Der Ventilkolben 52 hat ferner einen langgestreckten Schaft 56 kleineren Durchmessers, der sich durch eine zentrale axiale Bohrung 62 erstreckt, die in der Ventilbüchse 44 ausgebildet ist. Zwischen dem Schaft 56 und der Innenwand der Bohrung 62 ist ein Ringraum gebildet, durch den das Druckmittel, wie noch erläutert wird, zum Auslaß oder Rücklaufanschluß 18 strömen kann.The valve piston 52 also has an elongated stem 56 of smaller diameter that extends through a central axial bore 62 formed in the valve sleeve 44. Between the shaft 56 and the inner wall of the bore 62, an annular space is formed through which the pressure medium, as will be explained, can flow to the outlet or return connection 18.

An den Schaft 56 schließt sich ein Endstück 58 an, das ebenfalls Teil des Ventilkolbens 52 ist und das einen größeren Durchmesser hat als der Schaft 56 und in der Führungsbüchse 42 axial geführt ist.An end piece 58 adjoins the shaft 56, which is also part of the valve piston 52 and has a larger diameter than the shaft 56 and is guided axially in the guide bush 42.

Das Endstück 58 kann direkt am Stützring 36 anstoßen, in der dargestellten Ausführungsform sitzt jedoch eine Kappe 60 auf dem Endstück 58, die ihrerseits am Stützring 36 anliegt.The end piece 58 can abut directly on the support ring 36, but in the embodiment shown a cap 60 sits on the end piece 58, which in turn rests on the support ring 36.

Zwischen dem Schaft 80 der Ventilbüchse 44 und der Innenwand der Führungsbüchse 40 ist eine ringförmige Kammer 68 gebildet, die in Verbindung mit dem Zulaufanschluß 16 steht.Between the stem 80 of the valve sleeve 44 and the inner wall of the guide sleeve 40, an annular chamber 68 is formed, which is connected to the inlet connection 16.

Zwischen der Führungsbüchse 40 und der Ventilbüchse 44 ist eine Dichtung 70 und zwischen der Führungsbüchse 42 und dem Endstück 58 des Ventilkolbens ist eine Dichtung 72 angeordnet.A seal 70 is arranged between the guide sleeve 40 and the valve sleeve 44 and a seal 72 is arranged between the guide sleeve 42 and the end piece 58 of the valve piston.

Die erfindungsgemäße Vorrichtung arbeitet wie folgt :The device according to the invention works as follows:

Der Kolben 24 des Kolben-Zylinder-Aggregates befindet sich, wie Fig. 1 zeigt, in seiner Grundstellung. Der Zylinder 22, bzw. seine Kammer 30, ist über die Leitung 28, den Verbraucheranschluß 20, die Bohrung 62 und den offenen Ventilsitz 66 zum Auslaß bzw. Rücklaufanschluß 18 hin entlüftet. Der Ventilsitz 48 ist durch den Ventilteller 46 geschlossen und damit der Zulaufanschluß 16 gesperrt.The piston 24 of the piston-cylinder unit is in its basic position, as shown in FIG. 1. The cylinder 22, or its chamber 30, is vented via the line 28, the consumer connection 20, the bore 62 and the open valve seat 66 to the outlet or return connection 18. The valve seat 48 is closed by the valve plate 46 and thus the inlet port 16 is blocked.

Wird nun der Proportionalmagnet 14 erregt, so wird über seinen Anker 54 eine axiale Kraft auf den Ventilkolben 52 ausgeübt, der sich (bezogen auf Fig. 2) axial nach unten bewegt und zunächst den Ventilsitz 66 schließt, womit der Auslaß 18 gesperrt ist. Sobald der Ventilkolben 52 auf dem Ventilsitz 66 aufsitzt, wird bei weiterer axialer Bewegung die Ventilbüchse 44 mitgenommen und ebenfalls axial nach unten bewegt, wodurch der Ventilteller 46 vom Ventilsitz 48 abgehoben und der letztere geöffnet wird. Das Druckmittel kann dann vom Zulaufanschluß 16 her über die ringförmige Kammer 68 und den geöffneten Ventilsitz 48 zum Verbraucheranschluß 20 strömen und von dort über die Leitung 28 in die Kammer 30 des Zylinders 22.If the proportional magnet 14 is now energized, an axial force is exerted on the valve piston 52 via its armature 54, which moves axially downward (based on FIG. 2) and initially closes the valve seat 66, whereby the outlet 18 is blocked. As soon as the valve piston 52 is seated on the valve seat 66, the valve sleeve 44 is carried along with a further axial movement and likewise moved axially downward, as a result of which the valve disk 46 is lifted off the valve seat 48 and the latter is opened. The pressure medium can then flow from the inlet connection 16 via the annular chamber 68 and the opened valve seat 48 to the consumer connection 20 and from there via the line 28 into the chamber 30 of the cylinder 22.

Durch die axiale Verschiebung des Ventilkolbens 52 wird über dessen Endstück 58 und die Kappe 60 der Stützring 36 beaufschlagt und um das Maß der axialen Verschiebung des Ventilkolbens 52 aus einer Grundstellung in Richtung zur und gegen die Kraft der Feder 34 angehoben.Due to the axial displacement of the valve piston 52, the support ring 36 is acted upon via its end piece 58 and the cap 60 and is raised by the amount of the axial displacement of the valve piston 52 from a basic position in the direction of and against the force of the spring 34.

Durch das Druckmittel in der Kammer 30 wird die Stirnfläche 82 des Kolbens 24 beaufschlagt und der letztere gegen die Kraft der Federn 32 und 34 nach oben (bezogen auf Fig. 1) bewegt, wodurch die Feder 34 (und die Feder 32) gespannt wird. Die Regelfeder 34 übt nun auf den Stützring 36 eine Kraft aus, die proportional zum Weg des Kolbens 24 ist. Diese Kraft wird über die Kappe 60 auf den Ventilkolben 58, 52 übertragen und von diesem auf den Anker 54 des Proportionalmagneten 14.The pressure medium in the chamber 30 acts on the end face 82 of the piston 24 and moves the latter against the force of the springs 32 and 34 upward (with reference to FIG. 1), whereby the spring 34 (and the spring 32) is tensioned. The control spring 34 now exerts a force on the support ring 36 which is proportional to the path of the piston 24. This force is transmitted via the cap 60 to the valve piston 58, 52 and from there to the armature 54 of the proportional magnet 14.

Überwiegt diese Kraft die Kraft des Proportionalmagneten, so wird der Ventilkolben 52 etwas nach oben (bezogen auf Fig. 2) verschoben, wobei die Ventilbüchse 44 dieser Bewegung folgt, da ihr Ventilteller 46 durch die Druckfeder 50 in Schließrichtung des Ventilsitzes 48 beaufschlagt ist. Der Öffnungsquerschnitt des Ventilsitzes 48 wird dabei verringert, was zur Folge hat, daß weniger Druckmittel vom Zulaufanschluß 16 nachströmen kann.If this force outweighs the force of the proportional magnet, the valve piston 52 is shifted slightly upward (with reference to FIG. 2), the valve sleeve 44 following this movement, since its valve disk 46 is acted upon by the compression spring 50 in the closing direction of the valve seat 48. The opening cross section of the valve seat 48 is reduced, with the result that less pressure medium can flow in from the inlet connection 16.

Die Aufwärtsbewegung des Ventilkolbens 52 wird fortgesetzt, bis sich ein Kräftegleichgewicht zwischen der von der Regelfeder 34 einerseits und vom Proportionalmagneten 14 andererseits auf den Ventilkolben 52 ausgeübten Kräfte einstellt.The upward movement of the valve piston 52 continues until a force equilibrium is established between the forces exerted on the valve piston 52 by the control spring 34 on the one hand and by the proportional magnet 14 on the other hand.

Wird der Proportionalmagnet 14 stärker erregt, so überwiegt die von ihm auf den Ventilkolben 52 ausgeübte Kraft und der Ventilsitz 48 wird weiter geöffnet und damit der Durchflußquerschnitt für das vom Zulaufanschluß 16 kommende Druckmittel vergrößert, wodurch die Kraft auf den Kolben 24 ebenfalls erhöht wird.If the proportional magnet 14 is excited more, the force exerted by it on the valve piston 52 predominates and the valve seat 48 is opened further, thus increasing the flow cross section for the pressure medium coming from the inlet connection 16, which also increases the force on the piston 24.

Der Hub des Kolbens 24 wird dadurch größer und damit auch die Spannung der Regelfeder 34 und die Kraft, welche diese auf den Ventilkolben 52 ausübt. Der ganze Vorgang wiederholt sich nun, bis sich wieder ein Kräftegleichgewicht zwischen Regelfeder 34 und der vom Proportional- magneten 14 ausgeübten Kraft einstellt.As a result, the stroke of the piston 24 increases, and with it the tension of the control spring 34 and the force which it exerts on the valve piston 52. The whole process is now repeated until a balance of forces is established between the control spring 34 and the force exerted by the proportional magnet 14.

Der Hub des Kolbens 24 ist damit direkt proportional zur Einstellung bzw. zur Erregung des Proportionalmagneten 14.The stroke of the piston 24 is thus directly proportional to the setting or the excitation of the proportional magnet 14.

Es erfolgt somit ein Kräftevergleich zwischen Regelfeder und Proportionalmagneten.There is therefore a comparison of forces between the control spring and the proportional magnet.

Die Regelung erfolgt praktisch unabhängig von Druckschwankungen des Druckmittels und unabhängig von Reibungskräften.The control is practically independent of pressure fluctuations in the pressure medium and independent of frictional forces.

Dargestellt und beschrieben wurde eine Ausführungsform, bei der der Proportionalmagnet 14 eine stoßende Kraft auf den Ventilkolben 52 ausübt. Die Erfindung ist jedoch ebenso bei umgekehrter Arbeitsweise anwendbar, d. h. wenn der Proportionalmagnet eine ziehende Kraft auf den Ventilkolben ausübt.An embodiment has been shown and described in which the proportional magnet 14 has an impact force on the valve piston 52 exercises. However, the invention can also be used in the reverse mode of operation, ie when the proportional magnet exerts a pulling force on the valve piston.

Claims (4)

1. Valve equipment used for directional control of a piston/cylinder unit (22, 24), with a pressure regulator valve (12) the valve piston (52) of which can be actuated f. i. by a proportional magnet (14) and the pressure regulator will allow the entry of a pressure means via the cylinder piston (24) whereby a control spring (34) fitted as a coil pressure spring and acting with the valve piston (52) is situated between the cylinder piston (24) and one end (58) of the valve piston (52), characterized in that the pressure regulator valve (12) constitutes an independent, ready-to-mount unit fixed at or within the cylinder (22) of the piston/cylinder unit in a way that the control spring (34) is actuated asymmetrically by the valve piston (52).
2. Valve equipment of claim 1, characterized in that a support ring (36) is provided in order to achieve the load transmission between the valve piston (52) and the control spring (34).
3. Valve equipment of claim 2, characterized in that the support ring (36) is arranged in a ring groove (74) of the cylinder (22).
4. Valve equipment of claim 3, characterized in that the ring groove (74) is interrupted within the range of the pressure regulator valve (12) and this in order to allow the admission of the support ring (36) or of the control spring (34) by means of the valve piston (52).
EP19860102725 1985-03-07 1986-03-03 Valve device for positioning a piston-cylinder-device Expired EP0193908B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853508148 DE3508148A1 (en) 1985-03-07 1985-03-07 VALVE DEVICE FOR REGULATING A CONSUMER
DE3508148 1985-03-07

Publications (2)

Publication Number Publication Date
EP0193908A1 EP0193908A1 (en) 1986-09-10
EP0193908B1 true EP0193908B1 (en) 1989-01-11

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ID=6264513

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860102725 Expired EP0193908B1 (en) 1985-03-07 1986-03-03 Valve device for positioning a piston-cylinder-device

Country Status (4)

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EP (1) EP0193908B1 (en)
JP (1) JPS622008A (en)
BR (1) BR8600969A (en)
DE (1) DE3508148A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104847715B (en) * 2015-04-23 2017-01-25 中南大学 Control method for asymmetric electric-hydraulic proportional system based on model transferring

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3131608A (en) * 1961-10-25 1964-05-05 Yando Stephen Servomechanism
SE422102B (en) * 1980-01-24 1982-02-15 Olsbergs Hydraulic Ab ELECTRO-HYDRAULIC STELLDON
DE3125386A1 (en) * 1981-06-27 1983-01-13 Robert Bosch Gmbh, 7000 Stuttgart Electro-hydraulic actuating device, in particular for remote control of a directional control valve

Also Published As

Publication number Publication date
EP0193908A1 (en) 1986-09-10
DE3508148A1 (en) 1986-09-11
BR8600969A (en) 1986-11-18
JPS622008A (en) 1987-01-08

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