EP0966628B1 - Directional-control valve - Google Patents

Directional-control valve Download PDF

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Publication number
EP0966628B1
EP0966628B1 EP19980920466 EP98920466A EP0966628B1 EP 0966628 B1 EP0966628 B1 EP 0966628B1 EP 19980920466 EP19980920466 EP 19980920466 EP 98920466 A EP98920466 A EP 98920466A EP 0966628 B1 EP0966628 B1 EP 0966628B1
Authority
EP
European Patent Office
Prior art keywords
travel sensor
sensor tube
directional
control valve
valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19980920466
Other languages
German (de)
French (fr)
Other versions
EP0966628A1 (en
Inventor
Werner Reith
Binh Nguyen Xuan
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.)
Bosch Rexroth AG
Original Assignee
Mannesmann Rexroth AG
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Publication date
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Publication of EP0966628A1 publication Critical patent/EP0966628A1/en
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Publication of EP0966628B1 publication Critical patent/EP0966628B1/en
Anticipated expiration legal-status Critical
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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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
    • 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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/0401—Valve members; Fluid interconnections therefor
    • F15B13/0402—Valve members; Fluid interconnections therefor for linearly sliding valves, e.g. spool valves
    • 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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B2013/002—Modular valves, i.e. consisting of an assembly of interchangeable components
    • F15B2013/004—Cartridge valves
    • 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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/0401—Valve members; Fluid interconnections therefor
    • F15B2013/0409—Position sensing or feedback of the valve member
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/16—Rectilinearly-movable armatures
    • H01F2007/1684—Armature position measurement using coils
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8158—With indicator, register, recorder, alarm or inspection means
    • Y10T137/8225—Position or extent of motion indicator
    • Y10T137/8242—Electrical
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/86493—Multi-way valve unit
    • Y10T137/86574—Supply and exhaust
    • Y10T137/86582—Pilot-actuated
    • Y10T137/86614—Electric

Definitions

  • the invention relates to a directional valve with axial in the valve housing interior sliding control piston and one attached to the valve housing to Detecting the position of the control piston serving transducer, the one on has an end pressure-sealed end transducer tube, in the Immersed in the opening at the other end, a displacement sensor, on the control piston is attached and in the direction of its axial displacement a connecting the valve housing interior with the displacement transducer tube Passage extends through.
  • Valves of this type are known.
  • a proportional cartridge valve manufactured by the applicant This type is for example under the name 3WRC available in the stores.
  • Such valves are preferably used for control or control of large pressure oil volume flows, e.g. forge manipulators, Press cylinders, die casting machines and the like.
  • the known generic valves are characterized by a simple design because thanks to its pressure-tight design, the displacement transducer can Passage of the valve housing is attachable, through which the Displacement rod out of the valve housing interior into the opening of the Displacement tube extends into it. Because with this type of the in the passage prevailing consumer pressure also in the pressure-tight displacement transducer tube is effective, however, there is a risk that in cases where there is consumer pressure high pressure peaks with steep rising edges occur, it is too plastic Widening of the pressure-tight displacement transducer tube can come. this leads to often to disturbances in position detection, especially when using of inductive displacement sensors on the displacement sensor tube put on bobbin, the winding can tear, which leads to failure the associated control electronics and thus the valve leads.
  • the invention has for its object to a directional control valve of the type mentioned create that, on the other hand, is characterized by increased operational reliability.
  • This task is according to the invention with a directional valve at the beginning mentioned type by a in the passage between the valve housing interior and the opening of the displacement transducer provided one Damping gap released seal that an oil flow into the Throttle position allowing the transducer tube into it.
  • the throttling of the oil flow into the displacement transducer provided according to the invention dampens that occurring at a pressure peak in consumer pressure Compression volume flow in the direction of the displacement sensor so strong that the Pressure increase in the displacement transducer no longer leads to plastic deformations of the pipe and thus impair the function of the position detection of the displacement sensor.
  • the one in the passageway Sealing which forms the damping gap, also an oil flow check valve blocking the displacement transducer tube. This can cause oil, this when the displacement sensor moves into the displacement transducer tube is displaced into the valve housing interior via the check valve flow back so that the occurrence of compression pressure peaks in the Displacement tube due to immersion movements of the displacement sensor is avoided.
  • the damping gap is preferably on the valve body of the check valve intended.
  • this valve body can formed as a perforated disc having a central through hole be the one with its side facing the displacement transducer serving as a valve seat surface, formed on a shoulder of the passage Shoulder surface interacts and with its through hole on the encoder rod is performed with a game forming the damping gap.
  • a built-in directional control valve designated as a whole by 1 in FIG. 1, has a valve housing 3 on, in which a control piston 5 in the axial direction, based on the Housing longitudinal axis 7, is slidable to a stepless in 3/2-way function Regulation of a pressure oil volume flow from the pressure oil connection P to To effect consumer connection A and from connection A to tank connection T.
  • Control connections for the control of the directional valve by means of a pilot valve 9 are designated by 11 and 13 in FIG. 1.
  • a control electronics 15 is provided, which in the usual Formed and therefore not shown and described in detail is.
  • the control electronics 15 is in the housing of an inductive displacement sensor 17 housed, which is flanged to the valve housing 3 and via the control electronics 15 forms part of a position control loop.
  • the displacement sensor 17 is connected to the valve housing 3 via an intermediate piece 19 connected, which is a passage 21 from the adjacent valve housing interior 23 to the facing opening 25 a displacement transducer tube 27 which forms at its opening 25 (FIG. 2) opposite end 29 is completed pressure-tight.
  • a displacement transducer tube 27 which forms at its opening 25 (FIG. 2) opposite end 29 is completed pressure-tight.
  • the Weggeberstab 33 consists in a known manner of an essentially non-magnetic Core support rod, at the front end of which a soft iron rod is welded, which as a ferromagnetic core with the winding of the bobbin 31 for path-dependent influencing of the inductance interacts.
  • this damping device is performed by a passage 21 provided seal that the passage 21 except for a damping gap completes that a throttle point for the oil flow in the displacement transducer 27th forms.
  • the Damping gap formed on a perforated disc 37, the central Through hole 39 is mounted on the displacement rod 33.
  • the inside diameter of the through hole 39 is slightly larger than the outer diameter of the displacement rod 33 to between this and the inner wall of the through hole 39 to form the damping gap.
  • Spring element which in the exemplary embodiment consists of disc springs 43, clamps the side of the perforated disk 37 facing the displacement transducer tube 27 for abutment on a shoulder surface 45, which by a paragraph of the Passage 21 is formed.
  • the perforated disk 37 thus forms together with that acting as a valve seat surface
  • Shoulder surface 45 is a check valve that allows oil to flow into the displacement tube 27 locks in except for the throttled oil flow through the damping gap passes.
  • the displacement sensor 33 at a corresponding movement of the piston 5 into the displacement sensor tube 27 retracts and displaces a certain amount of oil, this in the forward direction drain the check valve formed, so that none by piston movement caused pressure peak occurs in the displacement transducer tube 27.
  • the outer diameter the perforated disc 37 is slightly smaller than the inside diameter of the relevant one Section of the passage 21 so that the perforated disc 37 only on the Weggeberstab 33 is guided, what the friction forces acting on the perforated disc 37 and thus also reduces wear.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Indication Of The Valve Opening Or Closing Status (AREA)

Abstract

The invention relates to a directional-control valve with an axially displaceable control piston (5) inside a valve housing (23) and a travel sensor (17) which is arranged on the valve housing (3) in order to detect the position of the control piston (5). Said sensor (17) comprises a travel sensor tube(27) which is pressure tight and sealed on one end (29) and has a directional transmitter rod (33) plunging into the other end. Said directional transmitter rod (33) is secured to the control piston (5) and extends through the area connecting the inside of the valve housing (23) to the travel sensor tube (27). The invention includes a seal (37) that exposes a damping gap placed in the connecting area (21) which forms a throttle point enabling oil to flow into the travel sensor tube (27).

Description

Die Erfindung betrifft ein Wegeventil mit im Ventilgehäuseinnenraum axial verschiebbarem Steuerkolben und einem am Ventilgehäuse angebrachten, zum Erfassen der Position des Steuerkolbens dienenden Wegaufnehmer, der ein am einen Ende druckdicht abgeschlossenes Wegaufnehmerrohr aufweist, in dessen Öffnung am anderen Ende ein Weggeberstab eintaucht, der am Steuerkolben befestigt ist und sich in der Richtung von dessen Axialverschiebung durch einen den Ventilgehäuseinnenraum mit dem Wegaufnehmerrohr verbindenden Durchgang hindurch erstreckt.The invention relates to a directional valve with axial in the valve housing interior sliding control piston and one attached to the valve housing to Detecting the position of the control piston serving transducer, the one on has an end pressure-sealed end transducer tube, in the Immersed in the opening at the other end, a displacement sensor, on the control piston is attached and in the direction of its axial displacement a connecting the valve housing interior with the displacement transducer tube Passage extends through.

Ventile dieser Art sind bekannt. Ein von der Anmelderin hergestelltes Proportional-Einbauventil dieser Art ist beispielsweise unter der Bezeichnung 3WRC im Handel erhältlich. Derartige Ventile dienen vorzugsweise der Steuerung oder Regelung großer Drucköl-Volumenströme, z.B. bei Schmiedemanipulatoren, Pressenzylindern, Druckgießmaschinen und dergleichen. Valves of this type are known. A proportional cartridge valve manufactured by the applicant This type is for example under the name 3WRC available in the stores. Such valves are preferably used for control or control of large pressure oil volume flows, e.g. forge manipulators, Press cylinders, die casting machines and the like.

Bei einem aus der DE 34 20 400 A1 bekannten Wegeventil ähnlicher Art, ist kein druckdicht abgeschlossenes Wegaufnehmerrohr vorhanden, vielmehr ist das Innere des Wegaufnehmers über Bohrungen mit Tank verbunden und somit drucklos. Eine Weggeberstange, die sich aus der benachbarten Ventilkammer in den Weggeber erstreckt, durchgreift eine Dichteinrichtung, die die Ventilkammer fluidisch von dem mit Tank verbundenen drucklosen Bereich trennt. In a directional valve of a similar type known from DE 34 20 400 A1, there is no pressure transducer tube sealed, rather the interior of the displacement sensor is connected to the tank via holes and therefore depressurized. A displacement sensor rod that emerges from the neighboring one Valve chamber extends into the displacement sensor, passes through a sealing device, which fluidly connects the valve chamber to that of the tank unpressurised area.

Die bekannten gattungsgemäßen Ventile zeichnen sich durch eine einfache Bauweise aus, weil der Wegaufnehmer dank seiner druckdichten Ausbildung unmittelbar an dem Durchgang des Ventilgehäuses anbringbar ist, durch den hindurch sich der Weggeberstab aus dem Ventilgehäuseinnenraum heraus in die Öffnung des Wegaufnehmerrohres hinein erstreckt. Da bei dieser Bauart der im Durchgang herrschende Verbraucherdruck auch im druckdichten Wegaufnehmerrohr wirksam ist, besteht jedoch die Gefahr, daß in Fällen, wo im Verbraucherdruck hohe Druckspitzen mit steilen Anstiegsflanken auftreten, es zu plastischen Aufweitungen des druckdichten Wegaufnehmerrohres kommen kann. Dies führt oftmals zu Störungen bei der Positionserfassung, insbesondere bei der Verwendung von induktiven Wegaufnehmern mit auf das Wegaufnehmerrohr aufgestecktem Spulenkörper, dessen Wicklung reißen kann, was zum Ausfall der zugehörigen Ansteuerelektronik und damit des Ventiles führt.The known generic valves are characterized by a simple design because thanks to its pressure-tight design, the displacement transducer can Passage of the valve housing is attachable, through which the Displacement rod out of the valve housing interior into the opening of the Displacement tube extends into it. Because with this type of the in the passage prevailing consumer pressure also in the pressure-tight displacement transducer tube is effective, however, there is a risk that in cases where there is consumer pressure high pressure peaks with steep rising edges occur, it is too plastic Widening of the pressure-tight displacement transducer tube can come. this leads to often to disturbances in position detection, especially when using of inductive displacement sensors on the displacement sensor tube put on bobbin, the winding can tear, which leads to failure the associated control electronics and thus the valve leads.

Der Erfindung liegt die Aufgabe zugrunde, ein Wegeventil der besagten Art zu schaffen, das sich demgegenüber durch eine erhöhte Betriebssicherheit auszeichnet. Diese Aufgabe ist erfindungsgemäß bei einem Wegeventil der eingangs genannten Art durch eine im Durchgang zwischen dem Ventilgehäuseinnenraum und der Öffnung des Wegaufnehmerrohres vorgesehene, einen Dämpfungsspalt freilassende Abdichtung gelöst, die eine einen Ölfluß in das Wegaufnehmerrohr hinein zulassende Drosselstelle bildet.The invention has for its object to a directional control valve of the type mentioned create that, on the other hand, is characterized by increased operational reliability. This task is according to the invention with a directional valve at the beginning mentioned type by a in the passage between the valve housing interior and the opening of the displacement transducer provided one Damping gap released seal that an oil flow into the Throttle position allowing the transducer tube into it.

Die erfindungsgemäß vorgesehene Drosselung des Ölflusses in das Wegaufnehmerrohr dämpft den bei einer Druckspitze im Verbraucherdruck auftretenden Kompressionsvolumenstrom in Richtung des Wegaufnehmers so stark, daß der Druckanstieg im Wegaufnehmerrohr nicht mehr zu plastischen Verformungen des Rohres und damit zu einer Beeinträchtigung der Funktion der Positionserfassung des Wegaufnehmers führt. The throttling of the oil flow into the displacement transducer provided according to the invention dampens that occurring at a pressure peak in consumer pressure Compression volume flow in the direction of the displacement sensor so strong that the Pressure increase in the displacement transducer no longer leads to plastic deformations of the pipe and thus impair the function of the position detection of the displacement sensor.

Bei einem bevorzugten Ausführungsbeispiel weist die im Durchgang befindliche Abdichtung, welche den Dämpfungsspalt bildet, zusätzlich ein den Ölfluß in das Wegaufnehmerrohr sperrendes Rückschlagventil auf. Dadurch kann Öl, das bei Eintauchbewegungen des Weggeberstabes in das Wegaufnehmerrohr hinein verdrängt wird, über das Rückschlagventil zum Ventilgehäuseinnenraum zurückfließen, so daß auch das Auftreten von Kompressions-Druckspitzen im Wegaufnehmerrohr aufgrund von Eintauchbewegungen des Weggeberstabes vermieden ist.In a preferred embodiment, the one in the passageway Sealing, which forms the damping gap, also an oil flow check valve blocking the displacement transducer tube. This can cause oil, this when the displacement sensor moves into the displacement transducer tube is displaced into the valve housing interior via the check valve flow back so that the occurrence of compression pressure peaks in the Displacement tube due to immersion movements of the displacement sensor is avoided.

Vorzugsweise ist der Dämpfungsspalt am Ventilkörper des Rückschlagventils vorgesehen.The damping gap is preferably on the valve body of the check valve intended.

Dieser Ventilkörper kann bei einem besonders vorteilhaften Ausführungsbeispiel als eine ein zentrales Durchgangsloch aufweisende Lochscheibe ausgebildet sein, die mit ihrer dem Wegaufnehmerrohr zugekehrten Seite mit einer als Ventilsitzfläche dienenden, an einem Absatz des Durchganges ausgebildeten Schulterfläche zusammenwirkt und mit ihrem Durchgangsloch auf dem Weggeberstab mit einem den Dämpfungsspalt bildenden Spiel geführt ist.In a particularly advantageous exemplary embodiment, this valve body can formed as a perforated disc having a central through hole be the one with its side facing the displacement transducer serving as a valve seat surface, formed on a shoulder of the passage Shoulder surface interacts and with its through hole on the encoder rod is performed with a game forming the damping gap.

Nachstehend ist die Erfindung anhand eines in der Zeichnung dargestellten Ausführungsbeispiels im einzelnen erläutert. Es zeigen:

Fig. 1
einen teilweise schematisch vereinfacht gezeichneten Längsschnitt eines Ausführungsbeispieles des erfindungsgemäßen Wegeventils und
Fig. 2
einen in größerem Maßstab gezeichneten Ausschnitt aus Fig. 1, wobei der Bereich des Durchganges vom Ventilgehäuseinnenraum zum Wegaufnehmer gezeigt ist.
The invention is explained in detail below using an exemplary embodiment shown in the drawing. Show it:
Fig. 1
a partially schematically simplified longitudinal section of an embodiment of the directional control valve according to the invention and
Fig. 2
a section drawn on a larger scale from Fig. 1, the area of the passage from the valve housing interior to the displacement sensor is shown.

Ein in Fig. 1 als Ganzes mit 1 bezeichnetes Einbau-Wegeventil weist ein Ventilgehäuse 3 auf, in dem ein Steuerkolben 5 in Axialrichtung, bezogen auf die Gehäuselängsachse 7, verschiebbar ist, um in 3/2-Wege-Funktion eine stufenlose Regelung eines Drucköl-Volumenstromes vom Druckölanschluß P zum Verbraucheranschluß A und vom Anschluß A zum Tankanschluß T zu bewirken. Steueranschlüsse für die Ansteuerung des Wegeventils mittels eines Vorsteuerventils 9 sind in Fig. 1 mit 11 und 13 bezeichnet. Für die Betätigung des Vorsteuerventils 9 ist eine Steuerelektronik 15 vorgesehen, die in üblicher Weise ausgebildet und daher nicht im einzelnen dargestellt und beschrieben ist. Die Steuerelektronik 15 ist im Gehäuse eines induktiven Wegaufnehmers 17 untergebracht, der am Ventilgehäuse 3 angeflanscht ist und über die Steuerelektronik 15 Teil eines Lageregelkreises bildet.A built-in directional control valve, designated as a whole by 1 in FIG. 1, has a valve housing 3 on, in which a control piston 5 in the axial direction, based on the Housing longitudinal axis 7, is slidable to a stepless in 3/2-way function Regulation of a pressure oil volume flow from the pressure oil connection P to To effect consumer connection A and from connection A to tank connection T. Control connections for the control of the directional valve by means of a pilot valve 9 are designated by 11 and 13 in FIG. 1. For the operation of the Pilot valve 9, a control electronics 15 is provided, which in the usual Formed and therefore not shown and described in detail is. The control electronics 15 is in the housing of an inductive displacement sensor 17 housed, which is flanged to the valve housing 3 and via the control electronics 15 forms part of a position control loop.

Der Wegaufnehmer 17 ist mit dem Ventilgehäuse 3 über ein Zwischenstück 19 verbunden, das einen nach außen druckdicht abgeschlossenen Durchgang 21 vom angrenzenden Ventilgehäuseinnenraum 23 zur zugewandten Öffnung 25 eines Wegaufnehmerrohres 27 bildet, das an seinem der Öffnung 25 (Fig. 2) abgekehrten Ende 29 druckdicht abgeschlossen ist. Auf der Außenseite des Wegaufnehmerrohres 27, das sich koaxial zur Längsachse 7 erstreckt, befindet sich ein aufgesteckter, bewickelter Spulenkörper 31.The displacement sensor 17 is connected to the valve housing 3 via an intermediate piece 19 connected, which is a passage 21 from the adjacent valve housing interior 23 to the facing opening 25 a displacement transducer tube 27 which forms at its opening 25 (FIG. 2) opposite end 29 is completed pressure-tight. On the outside of the Displacement tube 27, which extends coaxially to the longitudinal axis 7 an attached, wound bobbin 31.

Ein an der dem Durchgang 21 zugewandten Stirnseite des Steuerkolbens 5 befestigter, zur Achse 7 koaxialer Weggeberstab 33 erstreckt sich durch das offene Ende 25 in das Wegaufnehmerrohr 27 hinein. Der Weggeberstab 33 besteht in bekannter Weise aus einem im wesentlichen nichtmagnetischen Kernträgerstab, an dessen vorderes Ende ein Weicheisenstab angeschweißt ist, der als ferromagnetischer Kern mit der Bewicklung des Spulenkörpers 31 zur wegabhängigen Beeinflussung der Induktivität zusammenwirkt. One on the end face of the control piston 5 facing the passage 21 attached, coaxial to the axis 7 encoder rod 33 extends through the open end 25 into the displacement sensor tube 27. The Weggeberstab 33 consists in a known manner of an essentially non-magnetic Core support rod, at the front end of which a soft iron rod is welded, which as a ferromagnetic core with the winding of the bobbin 31 for path-dependent influencing of the inductance interacts.

Aufgrund des durch Durchgangskanäle 35 im Steuerkolben 5 erreichten Druckausgleichs herrscht im Betrieb in dem an den Durchgang 21 angrenzenden Bereich des Ventilgehäuseinnenraumes 23 der Druck des Verbraucheranschlusses A. Über den Durchgang 21 und über das zugekehrte Ende 25 des Wegaufnehmerrohres 27, das an seinem anderen Ende 29 druckdicht abgeschlossen ist, baut sich dieser Druck auch im Wegaufnehmerrohr 27 auf. Um zu vermeiden, daß bei im Ventilgehäuseinnenraum 23 auftretenden sprunghaften Druckänderungen sich entsprechende Druckspitzen im Wegaufnehmerrohr 27 ausbilden, die zu plastischen Verformungen und damit zu Beschädigungen der Bewicklung des Spulenkörpers 31 führen könnten, befindet sich im Durchgang 21 eine Dämpfungseinrichtung, die einen Ölfluß in das Wegaufnehmerrohr 27 nur über eine Drosselstelle gestattet.Due to the pressure equalization achieved through through channels 35 in the control piston 5 prevails in operation in the adjacent to the passage 21 Area of the valve housing interior 23 the pressure of the consumer connection A. Via the passage 21 and the facing end 25 of the displacement sensor tube 27, which is closed at its other end 29 pressure-tight is, this pressure also builds up in the displacement sensor tube 27. In order to avoid, that in the case of sudden pressure changes occurring in the valve housing interior 23 corresponding pressure peaks form in the displacement sensor tube 27, the plastic deformations and thus damage to the Winding of the bobbin 31 could result in the passage 21 is a damping device that prevents oil flow into the displacement sensor tube 27 only permitted via a throttle.

Die Funktion dieser Dämpfungseinrichtung übernimmt eine im Durchgang 21 vorgesehene Abdichtung, die den Durchgang 21 bis auf einen Dämpfungsspalt abschließt, der eine Drosselstelle für den Ölfluß in das Wegaufnehmerrohr 27 bildet. Bei dem dargestellten und beschriebenen Ausführungsbeispiel ist der Dämpfungsspalt an einer Lochscheibe 37 gebildet, die mit ihrem zentralen Durchgangsloch 39 auf dem Weggeberstab 33 gelagert ist. Der Innendurchmesser des Durchgangsloches 39 ist etwas größer als der Außendurchmesser des Weggeberstabes 33, um zwischen diesem und der Innenwand des Durchgangsloches 39 den Dämpfungsspalt zu bilden.The function of this damping device is performed by a passage 21 provided seal that the passage 21 except for a damping gap completes that a throttle point for the oil flow in the displacement transducer 27th forms. In the illustrated and described embodiment, the Damping gap formed on a perforated disc 37, the central Through hole 39 is mounted on the displacement rod 33. The inside diameter of the through hole 39 is slightly larger than the outer diameter of the displacement rod 33 to between this and the inner wall of the through hole 39 to form the damping gap.

Ein im Durchgang 21 durch einen Sicherungsring 41 (Fig. 2) abgestütztes Federelement, das beim Ausführungsbeispiel aus Tellerfedern 43 besteht, spannt die dem Wegaufnehmerrohr 27 zugewandte Seite der Lochscheibe 37 für die Anlage an einer Schulterfläche 45 vor, die durch einen Absatz des Durchganges 21 gebildet ist. One supported in the passage 21 by a locking ring 41 (FIG. 2) Spring element, which in the exemplary embodiment consists of disc springs 43, clamps the side of the perforated disk 37 facing the displacement transducer tube 27 for abutment on a shoulder surface 45, which by a paragraph of the Passage 21 is formed.

Die Lochscheibe 37 bildet so zusammen mit der als Ventilsitzfläche wirkenden Schulterfläche 45 ein Rückschlagventil, das den Ölfluß in das Wegaufnehmerrohr 27 hinein bis auf den gedrosselten Ölfluß sperrt, der durch den Dämpfungsspalt hindurchtritt. Andererseits kann, wenn der Weggeberstab 33 bei einer entsprechenden Bewegung des Kolbens 5 in das Wegaufnehmerrohr 27 einfährt und dabei eine bestimmte Ölmenge verdrängt, diese in Durchlaßrichtung des gebildeten Rückschlagventiles abfließen, so daß keine durch Kolbenbewegung verursachte Druckspitze im Wegaufnehmerrohr 27 auftritt.The perforated disk 37 thus forms together with that acting as a valve seat surface Shoulder surface 45 is a check valve that allows oil to flow into the displacement tube 27 locks in except for the throttled oil flow through the damping gap passes. On the other hand, if the displacement sensor 33 at a corresponding movement of the piston 5 into the displacement sensor tube 27 retracts and displaces a certain amount of oil, this in the forward direction drain the check valve formed, so that none by piston movement caused pressure peak occurs in the displacement transducer tube 27.

Beim vorgesehenen Ausführungsbeispiel, siehe Fig. 2, ist der Außendurchmesser der Lochscheibe 37 etwas geringer als der Innendurchmesser des betreffenden Abschnittes des Durchganges 21, so daß die Lochscheibe 37 nur auf dem Weggeberstab 33 geführt ist, was die an der Lochscheibe 37 wirkenden Reibkräfte und damit auch den Verschleiß verringert.In the proposed embodiment, see Fig. 2, the outer diameter the perforated disc 37 is slightly smaller than the inside diameter of the relevant one Section of the passage 21 so that the perforated disc 37 only on the Weggeberstab 33 is guided, what the friction forces acting on the perforated disc 37 and thus also reduces wear.

Anstelle der beim gezeigten Ausführungsbeispiel vorgesehenen Abdichtung in Form eines einen Dämpfungsspalt freilassenden Rückschlagventils könnte ein übliches Dichtungselement vorgesehen sein, dessen natürlicherweise auftretende Leckage den gedrosselten Ölfluß bildet, der im Inneren des Wegaufnehmerrohres 27 einen im wesentlichen statischen, d.h. von Druckspitzen mit steilen Anstiegsflanken freien, Innendruck aufbaut.Instead of the seal provided in the exemplary embodiment shown in Form of a check valve leaving a damping gap could be a usual sealing element can be provided, the naturally occurring Leakage forms the throttled oil flow inside the displacement transducer 27 a substantially static, i.e. of pressure peaks with steep Free rising edges, internal pressure builds up.

Claims (8)

  1. Directional control valve with control piston (5) axially displaceable in the valve housing interior chamber (23) and a travel sensor (17) serving for the detection of the position of the control piston (5), mounted on the valve housing (3), wherein the travel sensor has a travel sensor tube (27) sealed pressure-tight at one end (29), into the opening (25) of which at. the other end is telescopically displaced a directional transmitter rod (33), which is fastened to the control piston (5) and extends in the direction of its axial displacement through a passage (21) connecting the valve housing interior chamber (23) with the travel sensor tube (27), characterized by a seal (37) provided in the passage (21) between the valve housing interior chamber (23) and the opening (25) of the travel sensor tube (27), leaving open a damping gap, wherein the seal forms a throttle point allowing an oil flow into the travel sensor tube (27).
  2. Directional control valve according to Claim 1, characterized in that a complete but still leaking seal is provided, wherein the leakage therefrom forms the throttled oil flow into the travel sensor tube (27).
  3. Directional control valve according to Claim 1, characterized in that the seal includes a check valve (37, 43, 45) blocking the oil flow into the travel sensor tube (27).
  4. Directional control valve according to Claim 3, characterized in that the damping gap is provided on the valve body (37) of the check valve.
  5. Directional control valve according to Claim 4, characterized in that a perforated disk (37) having a central passage opening (39) is provided as valve body, which perforated disk with its side adjacent to the travel sensor tube (27) cooperates with a shoulder surface (45) constructed on an offset of the passage (21) and serving as valve seat surface and is guided with its passage opening (39) on the directional transmitter rod (33) with a certain amount of play forming the damping gap.
  6. Directional control valve according to Claim 5, characterized in that a spring element (43) is present prestressing the perforated disk (37) to form the contact on the valve seat surface (45).
  7. Directional control valve according to Claim 5 or 6, characterized in that the exterior diameter of the perforated disk (37) is smaller than the interior diameter of the segment of the passage (21) intended to receive it.
  8. Directional control valve according to any of Claims 1 to 7, characterized in that the travel sensor (17) for inductive detection of the position of the control piston (5) has a coil body (31) with a winding positioned on the travel sensor tube (27), of which the inductance can be influenced by a ferromagnetic core of the directional transmitter rod (33) serving as core carrier.
EP19980920466 1997-03-13 1998-03-03 Directional-control valve Expired - Lifetime EP0966628B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19710318 1997-03-13
DE1997110318 DE19710318A1 (en) 1997-03-13 1997-03-13 Directional control valve
PCT/EP1998/001181 WO1998040652A1 (en) 1997-03-13 1998-03-03 Directional-control valve

Publications (2)

Publication Number Publication Date
EP0966628A1 EP0966628A1 (en) 1999-12-29
EP0966628B1 true EP0966628B1 (en) 2002-09-18

Family

ID=7823192

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19980920466 Expired - Lifetime EP0966628B1 (en) 1997-03-13 1998-03-03 Directional-control valve

Country Status (4)

Country Link
US (1) US6199585B1 (en)
EP (1) EP0966628B1 (en)
DE (2) DE19710318A1 (en)
WO (1) WO1998040652A1 (en)

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Also Published As

Publication number Publication date
DE59805609D1 (en) 2002-10-24
WO1998040652A1 (en) 1998-09-17
DE19710318A1 (en) 1998-09-17
US6199585B1 (en) 2001-03-13
EP0966628A1 (en) 1999-12-29

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