EP0433665B1 - Hydraulic control valve - Google Patents

Hydraulic control valve Download PDF

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Publication number
EP0433665B1
EP0433665B1 EP90121923A EP90121923A EP0433665B1 EP 0433665 B1 EP0433665 B1 EP 0433665B1 EP 90121923 A EP90121923 A EP 90121923A EP 90121923 A EP90121923 A EP 90121923A EP 0433665 B1 EP0433665 B1 EP 0433665B1
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EP
European Patent Office
Prior art keywords
chamber
spool
hole
valve
valve housing
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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
EP90121923A
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German (de)
French (fr)
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EP0433665A1 (en
Inventor
Gottfried Dipl.-Ing. Olbrich
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Robert Bosch GmbH
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Robert Bosch GmbH
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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
    • 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
    • F15B13/0416—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor with means or adapted for load sensing
    • F15B13/0417—Load sensing elements; Internal fluid connections therefor; Anti-saturation or pressure-compensation 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
    • F15B2013/006—Modular components with multiple uses, e.g. kits for either normally-open or normally-closed valves, interchangeable or reprogrammable manifolds

Definitions

  • the invention is based on a hydraulic directional control valve in control devices for single- or double-acting working cylinders, in particular for driving implements on agricultural vehicles, of the type defined in the preamble of claim 1.
  • Such hydraulic directional valves in so-called load-sensing technology are used to set up control devices for hydraulic motors with double-acting working cylinders, several hydraulic directional valves being combined to form a control block.
  • a three-way flow regulator is formed from the longitudinal bore in the valve housing provided with three chambers and a spring chamber and from the slide valve with two control edges, which is axially displaceable in the longitudinal bore, a priority regulator Ensures pressure supply (priority switching) of the directional control valve and forwards the quantity of pressure medium not required for the directional control valve to the priority control directional control valve.
  • the subordinate directional control valve is to be connected with its first connection opening to the second connection opening of the priority directional valve.
  • the first Connection opening of the previous directional valve lies on the pressure medium source, while the second connection opening of the subordinate directional valve is either connected to a further directional valve or to a pressure medium return.
  • the hydraulic directional control valve according to the invention with the characterizing features of claim 1 has the advantage that, by providing the fourth chamber on the longitudinal bore, the valve housing for a right-hand and a left-hand version are identical and can be produced with the same casting. This means a significant cost saving when casting the valve housing. Only the control slides to be inserted into the longitudinal bores of the valve housing have to be manufactured in a right and left version.
  • the two embodiments of the control slide are described in further claims 3 and 4.
  • the difference between The two embodiments of the control slide is limited to the machining process and consists exclusively in a staggered position of the at least one radial bore penetrating into the blind bore and thus requires a significantly lower manufacturing and storage expenditure than the provision of different molds and the production of different cast housings.
  • the directional control valve according to the invention has the additional advantage that the upstream three-way flow controller can be converted into a two-way flow controller with a slight reworking of the valve housing.
  • one bore each is made from the first and second connection openings, which penetrate one another and thus connect the two connection openings to one another.
  • the ring groove with the second control edge can be omitted in the control slide.
  • this can also be dispensed with and one of the two versions of the control slide can be used unchanged for the three-way current controller for right and left-hand versions.
  • valve housing according to claim 6 wherein it can also be used in an identical design for a right and a left-hand version, in that control slides which can be produced only by different machining are installed in the longitudinal bore of the valve housing.
  • a pressure medium channel to one of the two middle chambers can be saved and a simple full slide valve can also be used for the left-hand version.
  • the directional control valve for hydraulic control devices for double-acting working cylinders shown in longitudinal section in FIG. 1 has a valve housing 10 which is penetrated in the axial direction by a slide bore 11 and a parallel longitudinal bore 12 spaced apart therefrom. At the slide bore 11 are by annular Extensions formed a total of seven chambers 13-19, of which the five adjacent chambers 13-17 serve to control the direction of the pressure medium flow, while the two outer chambers 18, 19 are assigned to a measuring throttle point 20. Of the five adjacent chambers 13-17, the middle chamber serves as an inlet chamber 15, while the two chambers next to it form a first working chamber 14 and a second working chamber 16, each of which is connected to a working cylinder.
  • each working chamber 14, 16 there is a return chamber 13 or 17, which is connected in a manner not shown with a return connection on the valve housing 10.
  • the first measuring throttle chamber 18 located next to the second return chamber 17 serves as the measuring throttle chamber on the outlet side and the second measuring throttle chamber 19 serves as the measuring throttle chamber located upstream.
  • An arcuate working channel 23 leads from the first measuring throttle chamber 18 into the end of a multiply stepped blind hole 24 in which a check valve 25 is formed.
  • the blind hole 24 penetrates the downwardly extended inlet chamber 15 and receives a spherical closing member 26 of the check valve 25, which enables a pressure medium flow to the inlet chamber 15 and blocks in the opposite direction.
  • a total of four chambers 31-34 are formed in the longitudinal bore 12 by annular extensions.
  • the two middle chambers 32 and 33 are connected via two channels 27, 28 to a first connection opening 29, the inner chamber 34 via a channel 35 to a second connection opening 30 and the outer chamber 31 via a channel 36 to the second measuring throttle chamber 19.
  • the two connection openings 29, 30 lie in opposite housing side walls 101, 102, which each extend parallel to the axis of the slide bore 11 and the longitudinal bore 12.
  • the longitudinal bore 12 is widened slightly and forms a spring chamber 37 for receiving a control spring 38, which will be described later.
  • a control slide 40 is guided tightly and slidably.
  • the control slide 40 is divided by ring grooves into six piston sections 41-46, on which control edges for controlling the direction of the pressure medium flow are formed.
  • the control slide 40 can be displaced into three displacement positions against the force of a return spring 39 by means of an actuating mechanism which protrudes from the valve housing 10 (right in FIG. 1).
  • the mode of operation of the control slide 40 is known, so that it need not be discussed in more detail here.
  • the longitudinal bore 12 receives a longitudinally movable control slide 47, which forms a three-way flow valve together with the four chambers 31 - 34 on the longitudinal bore 12 by appropriate training.
  • the longitudinal bore 12 is closed on one end by a stopper 48 on which the control spring 38 is supported. With its other end, the control spring 38 engages on the end face of the control slide 47 and presses it against a stop 49 which can be manually adjusted from the outside and which is inserted into the opposite end face of the longitudinal bore 12.
  • the control slide 47 has an axial blind bore 50 which is open to the outer chamber 31.
  • the outer chamber 31 forms the outlet chamber of the three-way flow valve.
  • the bottom of the bag forms a counter pressure surface on the control slide 47 to the front pressure surface of the control slide 47 in the spring chamber 37.
  • the spring chamber 37 is connected to the working channel 23 via a connecting bore 51.
  • four radial bores 52 which are offset by 90 ° on the circumference, are further introduced, which on the one hand open in the jacket of the control slide 47 and on the other hand in the blind bore 50.
  • the radial bores 52 are arranged in the same cross-sectional plane in such a way that, in the basic position of the control slide 47 shown in FIG. 1, they lie in the region of the inner chamber 34.
  • the bore wall of the radial bores 52 form a control edge 53 with which the pressure medium flow between the inner chamber 34 and outer chamber 31 is controlled.
  • the regulating slide 47 also has an annular groove 54, which is introduced into the slide casing and one flank of which forms a second control edge 55 for regulating the pressure medium flow between the inner chamber 34 and the adjacent chamber 33.
  • the pressure medium flow is introduced into the valve housing 30 via the second connection opening 30.
  • the second connection opening 30 thus forms the inlet opening and the inner chamber 34 the inlet chamber of the three-way flow valve.
  • the first connection opening 29 is connected to a continuation, so that a pressure medium flow controlled by the control slide 47 leaves the valve housing 10 via the first connection opening 29.
  • the direction of flow of the pressure medium flow is indicated in FIG. 3 by two directional arrows at the connection openings 29, 30 and in FIG. 1 by arrows in the channels 28, 35, 36.
  • a pressure medium flow to one of the working connections 21, 22 is controlled by deflection of the control slide 40, this pressure medium flow flows from the second connection opening 30 via the inlet channel 35 into the inner inlet chamber 34 and from there via the radial bores 52 and the blind bore 50 of the control slide 47 into the outer outlet chamber 31 and from there passes via the channel 36, the two measuring throttle chambers 18, 19, the working channel 23 while opening the check valve 25 into the inlet chamber 15 and to one of the two working connections 21, 22. That of the measuring throttle point 20 between the two Measuring throttle chambers 18, 19 determined pressure drop is here via the connecting bore 51 to the spring chamber 37 and via the channel 36 opposite to the force of the Control spring 38 on the control slide 47 and moves it against the force of the control spring 38.
  • FIG. 2 shows a cutout of the directional control valve described in the left-hand version.
  • the valve housing 10 is unchanged and corresponds to that of FIG. 1.
  • pressure medium is now supplied to the valve housing 10 via the first connection opening 29 and the unused pressure medium partial flow is discharged via the second connection opening 30.
  • the first connection opening 29 thus now forms the inlet opening and the middle chamber 32 the inlet opening of the three-way flow regulator.
  • control slide 47 'of the directional control valve for the left-hand version is slightly modified to ensure the control function, namely the radial bores 52 are arranged in such a cross-sectional plane that they are in the basic position of the control slide 47' shown in FIG. 2 in the region of the central chamber 32 forming the inlet chamber lie. Otherwise, the directional control valve according to FIG. 2 is unchanged, so that the same components are provided with the same reference numerals.
  • a two-way current regulator is desired, as described, for example, in DE 36 03 811 A1 (FIG. 1), this can be achieved by slightly reworking the valve housing 10.
  • a bore 56, 57 are made in the valve housing 10 from the two connection openings 29, 30, which penetrate one another. This is shown in Figures 3 and 4. Through these two holes 56, 57, the two connection openings 29, 30 are directly connected.
  • All chambers 32, 33 and 34 are now the function of inlet chambers, of which only the inner chamber 34 or the middle chamber 32 is effective, however, depending on the design of the control slide 47 (FIG. 1) or 47 '(FIG. 2).
  • Each of the two control slides 47 and 47 ' can be used for the function of the two-way current regulator.
  • a control slide can also be used, in which the additional annular groove 54 has been omitted.
  • FIG. 5 shows a cutout of the directional control valve described in the right-hand version, corresponding to the right-hand version according to FIG. 1, but instead of the previous valve housing 10, another, second valve housing 60 is used, which can also be used unchanged for a left-hand version.
  • the second valve housing 60 differs from the first valve housing 10 only in that the previous channel 27 between the first connection opening 29 and the fourth chamber 32 is omitted; in the second valve housing 60, only the middle chamber 33 adjoining the inner chamber 34 is connected to the first connection opening 29 via the channel 28.
  • the construction of the second valve housing 60 is thus simpler.
  • the control slide 47 designed as a hollow slide according to FIG. 1 is installed unchanged in the second valve housing 60.
  • the function of the directional control valve with the second valve housing 60 according to FIG. 5 in the right-hand version is the same as that of the right-hand version according to FIG. 1.
  • control slide 61 is designed here in a full slide design, on which the annular groove 54, on the one hand, forms the second control edge 55 with its radial groove flank, which forms the volume flow determined between the middle chamber 33 and the inner chamber 34.
  • the other flank of the groove forms the first control edge 62 which, in the starting position of the control slide 61, lies on a piston section 63 located in the fourth chamber 32 and which adjusts the pressure medium flow between the middle chamber 33 serving as the inlet chamber and the outer outlet chamber 31.
  • the control slide 61 like the hollow slide 47, can only be produced from a slide blank by other processing and is particularly simple.
  • the mode of operation of the left-hand guide according to FIG. 6 essentially corresponds to that of the left-hand version according to FIG. 2, but the volume flow to the measuring throttle point is guided via the central chamber 33 and, as a result of the full slide valve design, through the longitudinal bore 12 to the outer chamber 31.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Multiple-Way Valves (AREA)
  • Servomotors (AREA)

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem hydraulischen Wegeventil in Steuereinrichtungen für einfach- oder doppelt-wirkende Arbeitszylinder, insbesondere zum Antrieb von Arbeitsgeräten an landwirtschaftlichen Fahrzeugen, der im Oberbegriff des Anspruchs 1 definierten Gattung.The invention is based on a hydraulic directional control valve in control devices for single- or double-acting working cylinders, in particular for driving implements on agricultural vehicles, of the type defined in the preamble of claim 1.

Solche hydraulische Wegeventile in sog. load-sensing-Technik (LS-Technik) dienen zum Aufbau von Steuereinrichtungen für Hydromotoren mit doppeltwirkenden Arbeitszylindern, wobei mehrere hydraulische Wegeventile zu einem Steuerblock vereinigt werden.Such hydraulic directional valves in so-called load-sensing technology (LS technology) are used to set up control devices for hydraulic motors with double-acting working cylinders, several hydraulic directional valves being combined to form a control block.

Bei einem bekannten hydraulischen Wegeventil der eingangs genannten Art (DE 36 03 811 A1) wird von der mit drei Kammern und einem Federraum versehenen Längsbohrung im Ventilgehäuse und von dem in der Längsbohrung axial verschieblichen Regelschieber mit zwei Steuerkanten ein Dreiwege-Stromregler gebildet, der eine vorrangige Druckversorgung (Prioritätsschaltung) des Wegeventils sicherstellt und die für das Wegeventil nicht benötigte Druckmittelmenge an das in der Priorität nachrangige Wegeventil weiterleitet. Das nachrangige Wegeventil ist mit seiner ersten Anschlußöffnung mit der zweiten Anschlußöffnung des vorrangigen Wegeventils zu verbinden. Die erste Anschlußöffnung des vorangigen Wegeventils liegt an der Druckmittelquelle, während die zweite Anschlußöffnung des nachrangigen Wegeventils entweder mit einem weiteren Wegeventil oder mit einem Druckmittelrücklauf verbunden ist.In a known hydraulic directional control valve of the type mentioned (DE 36 03 811 A1), a three-way flow regulator is formed from the longitudinal bore in the valve housing provided with three chambers and a spring chamber and from the slide valve with two control edges, which is axially displaceable in the longitudinal bore, a priority regulator Ensures pressure supply (priority switching) of the directional control valve and forwards the quantity of pressure medium not required for the directional control valve to the priority control directional control valve. The subordinate directional control valve is to be connected with its first connection opening to the second connection opening of the priority directional valve. The first Connection opening of the previous directional valve lies on the pressure medium source, while the second connection opening of the subordinate directional valve is either connected to a further directional valve or to a pressure medium return.

Beim Zusammensetzen eines Steuerblocks aus solchen Wegeventilen besteht die Forderung, Blöcke in sogenannter "Linksausführung" bzw. "Rechtsausführung" bilden zu können. Bei einem Linksausführungsblock erfolgt der Druckmittelzulauf zu den Wegeventilen von einer "linken" Blockeingangsplatte, bei einem Rechtsausführungsblock von einer "rechten" Eingangsplatte. In den beiden Fällen ist also die Druckzufuhr um 180° entgegengesetzt, d. h. die Wegeventile werden aus unterschiedlichen Richtungen angeströmt. Um dieser Forderung gerecht zu werden, müssen nach bekannter Technik Wegeventile aus Abgüssen mit unterschiedlichen Kernen hergestellt werden. Die Anzahl der Wegeventile pro Steuerblock kann beliebig gewählt werden. Die erste Anschlußöffnung des ersten Wegeventils im Steuerblock ist mit der Druckmittelquelle und die zweite Anschlußöffnung des ersten Wegeventils im Steuerblock ist mit der ersten Anschlußöffnung des nächsten Wegeventils verbunden.When assembling a control block from such directional valves, there is a requirement to be able to form blocks in a so-called "left-hand version" or "right-hand version". In the case of a left-hand execution block, the pressure medium is supplied to the directional control valves from a "left" block inlet plate, and in the case of a right-hand execution block from a "right" inlet plate. In both cases, the pressure supply is 180 ° opposite, i.e. H. the directional control valves are flowed from different directions. In order to meet this requirement, directional control valves must be made from castings with different cores using known technology. The number of directional control valves per control block can be chosen arbitrarily. The first connection opening of the first directional valve in the control block is connected to the pressure medium source and the second connection opening of the first directional valve in the control block is connected to the first connection opening of the next directional valve.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße hydraulische Wegeventil mit den kennzeichnenden Merkmalen des Anspruchs 1 hat demgegenüber den Vorteil, daß durch das Vorsehen der vierten Kammer an der Längsbohrung die Ventilgehäuse für eine Rechts- und eine Linksausführung identisch sind und mit dem gleichen Abguß hergestellt werden können. Das bedeutet eine wesentliche Kosteneinsparung beim Gießen der Ventilgehäuse. Lediglich die in die Längsbohrungen der Ventilgehäuse einzusetzenden Regelschieber müssen in einer Rechts- und Linksausführung hergestellt werden. Die beiden Ausführungformen des Regelschiebers sind in den weiteren Ansprüchen 3 und 4 beschrieben. Der Unterschied zwischen den beiden Ausführungsformen des Regelschiebers ist dabei auf den Bearbeitungsvorgang beschränkt und besteht ausschließlich in einer versetzten Lage der mindestens einen in die Sackbohrung eindringenden Radialbohrung und erfordert somit einen wesentlich geringeren Fertigungs- und Lagerhaltungsaufwand als das Vorhalten unterschiedlicher Gußformen und das Anfertigen unterschiedlicher Gußgehäuse.The hydraulic directional control valve according to the invention with the characterizing features of claim 1 has the advantage that, by providing the fourth chamber on the longitudinal bore, the valve housing for a right-hand and a left-hand version are identical and can be produced with the same casting. This means a significant cost saving when casting the valve housing. Only the control slides to be inserted into the longitudinal bores of the valve housing have to be manufactured in a right and left version. The two embodiments of the control slide are described in further claims 3 and 4. The difference between The two embodiments of the control slide is limited to the machining process and consists exclusively in a staggered position of the at least one radial bore penetrating into the blind bore and thus requires a significantly lower manufacturing and storage expenditure than the provision of different molds and the production of different cast housings.

Das erfindungsgemäße Wegeventil hat den zusätzlichen Vorteil, daß der vorgeschaltete Dreiwege-Stromregler mit einer geringfügigen Nachbearbeitung des Ventilgehäuses in einen Zweiwege-Stromregler umgewandelt werden kann. Hierzu werden von der ersten und zweiten Anschlußöffnung je eine Bohrung eingebracht, die sich einander durchdringen und damit die beiden Anschlußöffnungen miteinander verbinden. Beim Regelschieber kann die Ringnut mit der zweiten Steuerkante entfallen. Allerdings kann auch darauf verzichtet werden und eine der beiden Ausführungen des Regelschiebers für den Dreiwege-Stromregler für Rechts- und Linksausführung unverändert verwendet werden.The directional control valve according to the invention has the additional advantage that the upstream three-way flow controller can be converted into a two-way flow controller with a slight reworking of the valve housing. For this purpose, one bore each is made from the first and second connection openings, which penetrate one another and thus connect the two connection openings to one another. The ring groove with the second control edge can be omitted in the control slide. However, this can also be dispensed with and one of the two versions of the control slide can be used unchanged for the three-way current controller for right and left-hand versions.

Ferner ist es vorteilhaft, das Ventilgehäuse gemäß Anspruch 6 auszubilden, wobei es ebenfalls in identischer Bauform für eine Rechts- und eine Linksausführung verwendbar ist, indem lediglich durch unterschiedliche Bearbeitung herstellbare Regelschieber in die Längsbohrung des Ventilgehäuses eingebaut werden. Bei der Ausbildung des Ventilgehäuses nach Anspruch 6 kann ein Druckmittelkanal zu einer der beiden mittleren Kammern eingespart werden und zudem für die Linksausführung ein einfacher Vollschieber verwendet werden.Furthermore, it is advantageous to design the valve housing according to claim 6, wherein it can also be used in an identical design for a right and a left-hand version, in that control slides which can be produced only by different machining are installed in the longitudinal bore of the valve housing. In the design of the valve housing according to claim 6, a pressure medium channel to one of the two middle chambers can be saved and a simple full slide valve can also be used for the left-hand version.

Durch die in den weiteren Ansprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Anspruch 1 angegebenen Wegeventils möglich.Advantageous further developments and improvements of the directional control valve specified in claim 1 are possible through the measures listed in the further claims.

Zeichnungdrawing

Die Erfindung ist anhand von in der Zeichnung dargestellten Ausführungsbeispielen in der nachfolgenden Beschreibung näher erläutert.
Es zeigen:

  • Figur 1 einen Längsschnitt eines hydraulischen Wegeventils mit Dreiwege-Stromregler in Rechtsausführung,
  • Figur 2 ausschnittweise einen Längsschnitt eines Wegeventils mit Dreiwege-Stromregler in Linksausführung,
  • Figur 3 einen Schnitt längs der Linie III-III in Figur 1,
  • Figur 4 einen Schnitt längs der Linie IV-IV in Figur 1,
  • Figur 5 ausschnittweise einen Längsschnitt eines Wegeventils mit Dreiwege-Stromregler mit einer zweiten Ausführungsform des Ventilgehäuses in Rechtsausführung,
  • Figur 6 ausschnittweise einen Längsschnitt eines Wegeventils mit Dreiwege-Stromregler mit der zweiten Ausführungsform des Ventilgehäuses in Linksausführung.
The invention is explained in more detail in the following description with reference to exemplary embodiments shown in the drawing.
Show it:
  • FIG. 1 shows a longitudinal section of a hydraulic directional control valve with a three-way flow regulator in the right-hand version,
  • FIG. 2 shows a detail of a longitudinal section of a directional control valve with a three-way flow regulator in a left-hand version,
  • FIG. 3 shows a section along the line III-III in FIG. 1,
  • FIG. 4 shows a section along the line IV-IV in FIG. 1,
  • 5 shows a detail of a longitudinal section of a directional control valve with a three-way flow regulator with a second embodiment of the valve housing in a right-hand version,
  • 6 shows a detail of a longitudinal section of a directional control valve with a three-way flow regulator with the second embodiment of the valve housing in a left-hand version.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Das in Figur 1 im Längsschnitt dargestellte Wegeventil für hydraulische Steuereinrichtungen für doppeltwirkende Arbeitszylinder hat ein Ventilgehäuse 10, das von einer Schieberbohrung 11 und einer dazu parallelen, im Abstand verlaufenden Längsbohrung 12 in Achsrichtung durchdrungen ist. An der Schieberbohrung 11 sind durch ringförmige Erweiterungen insgesamt sieben Kammern 13 - 19 ausgebildet, von denen die fünf nebeneinander liegenden Kammern 13 - 17 der Richtungssteuerung des Druckmittelstroms dienen, während die beiden außenliegenden Kammern 18, 19 einer Meßdrosselstelle 20 zugeordnet sind. Von den fünf nebeneinander liegenden Kammern 13 - 17 dient die mittlere Kammer als Zulaufkammer 15, während die neben ihr liegenden beiden Kammern eine erste Arbeitskammer 14 und eine zweite Arbeitskammer 16 bildet, die jeweils mit einem Arbeitszylinder in Verbindung steht. Neben jeder Arbeitskammer 14, 16 liegt eine Rücklaufkammer 13 bzw. 17, die in nicht näher gezeichneter Weise mit einem Rücklaufanschluß am Ventilgehäuse 10 in Verbindung steht. Von den beiden Meßdrosselkammern 18, 19 dient die neben der zweiten Rücklaufkammer 17 liegende erste Meßdrosselkammer 18 als ablaufseitige Meßdrosselkammer und die zweite Meßdrosselkammer 19 als stromaufwärts liegende Meßdrosselkammer. Von der ersten Meßdrosselkammer 18 führt ein bogenförmiger Arbeitskanal 23 in das Ende einer mehrfach abgesetzten Sacklochbohrung 24, in der ein Rückschlagventil 25 ausgebildet ist. Die Sacklochbohrung 24 durchdringt die nach unten verlängerte Zulaufkammer 15 und nimmt ein kugeliges Schließglied 26 des Rückschlagventils 25 auf, das einen Druckmittelfluß zu der Zulaufkammer 15 hin ermöglicht und in Gegenrichtung absperrt.The directional control valve for hydraulic control devices for double-acting working cylinders shown in longitudinal section in FIG. 1 has a valve housing 10 which is penetrated in the axial direction by a slide bore 11 and a parallel longitudinal bore 12 spaced apart therefrom. At the slide bore 11 are by annular Extensions formed a total of seven chambers 13-19, of which the five adjacent chambers 13-17 serve to control the direction of the pressure medium flow, while the two outer chambers 18, 19 are assigned to a measuring throttle point 20. Of the five adjacent chambers 13-17, the middle chamber serves as an inlet chamber 15, while the two chambers next to it form a first working chamber 14 and a second working chamber 16, each of which is connected to a working cylinder. In addition to each working chamber 14, 16 there is a return chamber 13 or 17, which is connected in a manner not shown with a return connection on the valve housing 10. Of the two measuring throttle chambers 18, 19, the first measuring throttle chamber 18 located next to the second return chamber 17 serves as the measuring throttle chamber on the outlet side and the second measuring throttle chamber 19 serves as the measuring throttle chamber located upstream. An arcuate working channel 23 leads from the first measuring throttle chamber 18 into the end of a multiply stepped blind hole 24 in which a check valve 25 is formed. The blind hole 24 penetrates the downwardly extended inlet chamber 15 and receives a spherical closing member 26 of the check valve 25, which enables a pressure medium flow to the inlet chamber 15 and blocks in the opposite direction.

In der Längsbohrung 12 sind durch ringförmige Erweiterungen insgesamt vier Kammern 31 - 34 ausgebildet. Die beiden mittleren Kammern 32 und 33 sind über zwei Kanäle 27, 28 mit einer ersten Anschlußöffnung 29, die innere Kammer 34 über einen Kanal 35 mit einer zweiten Anschlußöffnung 30 und die äußere Kammer 31 über einen Kanal 36 mit der zweiten Meßdrosselkammer 19 verbunden. Wie aus der Schnittzeichnung in Figur 3 hervorgeht, liegen die beiden Anschlußöffnungen 29, 30 in gegenüberliegenden Gehäuseseitenwänden 101, 102, die sich jeweils parallel zur Achse von Schieberbohrung 11 und Längsbohrung 12 erstrecken. In dem der inneren Kammer 34 naheliegenden Endabschnitt ist die Längsbohrung 12 geringfügig erweitert und bildet einen Federraum 37 zur Aufnahme einer noch zu beschreibenden Regelfeder 38.A total of four chambers 31-34 are formed in the longitudinal bore 12 by annular extensions. The two middle chambers 32 and 33 are connected via two channels 27, 28 to a first connection opening 29, the inner chamber 34 via a channel 35 to a second connection opening 30 and the outer chamber 31 via a channel 36 to the second measuring throttle chamber 19. As can be seen from the sectional drawing in FIG. 3, the two connection openings 29, 30 lie in opposite housing side walls 101, 102, which each extend parallel to the axis of the slide bore 11 and the longitudinal bore 12. In the end section near the inner chamber 34, the longitudinal bore 12 is widened slightly and forms a spring chamber 37 for receiving a control spring 38, which will be described later.

In der Schieberbohrung 11 ist ein Steuerschieber 40 dicht und gleitend geführt. Der Steuerschieber 40 ist durch Ringnuten in sechs Kolbenabschnitte 41 - 46 unterteilt, an denen Steuerkanten zur Richtungssteuerung des Druckmittelstrom ausgebildet sind. Der Steuerschieber 40 ist mittels eines an seinem aus dem Ventilgehäuse 10 herausragenden Ende (rechts in Figur 1) angreifenden Betätigungsmechanismus gegen die Kraft einer Rückstellfeder 39 in drei Verschiebestellungen verschiebbar. Die Wirkungsweise des Steuerschiebers 40 ist bekannt, so daß hierauf nicht näher eingegangen zu werden braucht.In the slide bore 11, a control slide 40 is guided tightly and slidably. The control slide 40 is divided by ring grooves into six piston sections 41-46, on which control edges for controlling the direction of the pressure medium flow are formed. The control slide 40 can be displaced into three displacement positions against the force of a return spring 39 by means of an actuating mechanism which protrudes from the valve housing 10 (right in FIG. 1). The mode of operation of the control slide 40 is known, so that it need not be discussed in more detail here.

Die Längsbohrung 12 nimmt einen längsbeweglichen Regelschieber 47 auf, der durch entsprechende Ausbildung zusammen mit den vier Kammern 31 - 34 an der Längsbohrung 12 ein Dreiwege-Stromventil bildet. Die Längsbohrung 12 wird auf der einen Stirnseite von einem Stopfen 48 verschlossen, an dem sich die Regelfeder 38 abstützt. Mit ihrem anderen Ende greift die Regelfeder 38 an der Stirnseite des Regelschiebers 47 an und drückt ihn gegen einen von außen manuell einstellbaren Anschlag 49, der in die gegenüberliegende Stirnseite der Längsbohrung 12 eingesetzt ist. Der Regelschieber 47 weist eine axiale Sackbohrung 50 auf, die zur äußeren Kammer 31 hin offen ist. Die äußere Kammer 31 bildet die Auslaßkammer des Dreiwege-Stromventils. Der Sackgrund bildet am Regelschieber 47 eine Gegendruckfläche zur stirnseitigen Druckfläche des Regelschiebers 47 in dem Federraum 37. Der Federraum 37 steht über eine Verbindungsbohrung 51 mit dem Arbeitskanal 23 in Verbindung. Im Regelschieber 47 sind weiterhin vier um 90° am Umfang versetzte Radialbohrungen 52 eingebracht, die einereits im Mantel des Regelschiebers 47 und andererseits in der Sackbohrung 50 münden. Die Radialbohrungen 52 sind in derselben Querschnittsebene so angeordnet, daß sie in der in Figur 1 gezeigten Grundstellung des Regelschiebers 47 im Bereich der inneren Kammer 34 liegen. Die Bohrungswand der Radialbohrungen 52 bilden eine Steuerkante 53 mit welcher der Druckmittelstrom zwischen innerer Kammer 34 und äußerer Kammer 31 gesteuert wird. Der Regelschieber 47 weist ferner eine in den Schiebermantel eingebrachte Ringnut 54 auf, deren eine Nutflanke eine zweite Steuerkante 55 zur Regelung des Druckmittelstroms zwischen der inneren Kammer 34 und der danebenliegenden Kammer 33 bildet.The longitudinal bore 12 receives a longitudinally movable control slide 47, which forms a three-way flow valve together with the four chambers 31 - 34 on the longitudinal bore 12 by appropriate training. The longitudinal bore 12 is closed on one end by a stopper 48 on which the control spring 38 is supported. With its other end, the control spring 38 engages on the end face of the control slide 47 and presses it against a stop 49 which can be manually adjusted from the outside and which is inserted into the opposite end face of the longitudinal bore 12. The control slide 47 has an axial blind bore 50 which is open to the outer chamber 31. The outer chamber 31 forms the outlet chamber of the three-way flow valve. The bottom of the bag forms a counter pressure surface on the control slide 47 to the front pressure surface of the control slide 47 in the spring chamber 37. The spring chamber 37 is connected to the working channel 23 via a connecting bore 51. In the control slide 47, four radial bores 52, which are offset by 90 ° on the circumference, are further introduced, which on the one hand open in the jacket of the control slide 47 and on the other hand in the blind bore 50. The radial bores 52 are arranged in the same cross-sectional plane in such a way that, in the basic position of the control slide 47 shown in FIG. 1, they lie in the region of the inner chamber 34. The bore wall of the radial bores 52 form a control edge 53 with which the pressure medium flow between the inner chamber 34 and outer chamber 31 is controlled. The regulating slide 47 also has an annular groove 54, which is introduced into the slide casing and one flank of which forms a second control edge 55 for regulating the pressure medium flow between the inner chamber 34 and the adjacent chamber 33.

In der in Figur 1 gezeigten Rechtsausführung wird der Druckmittelstrom über die zweite Anschlußöffnung 30 in das Ventilgehäuse 30 eingeleitet. Die zweite Anschlußöffnung 30 bildet somit die Einlaßöffnung und die innere Kammer 34 die Einlaßkammer des Dreiwege-Stromventils. Die erste Anschlußöffnung 29 ist an einem Weiterlauf angeschlossen, so daß ein vom Regelschieber 47 ausgesteuerter Druckmittelstrom über die erste Anschlußöffnung 29 das Ventilgehäuse 10 verläßt. Die Flußrichtung des Druckmittelstroms ist in Figur 3 durch zwei Richtungspfeile an den Anschlußöffnungen 29, 30 und in Figur 1 durch Pfeile in den Kanälen 28, 35, 36 kenntlich gemacht.In the right-hand version shown in FIG. 1, the pressure medium flow is introduced into the valve housing 30 via the second connection opening 30. The second connection opening 30 thus forms the inlet opening and the inner chamber 34 the inlet chamber of the three-way flow valve. The first connection opening 29 is connected to a continuation, so that a pressure medium flow controlled by the control slide 47 leaves the valve housing 10 via the first connection opening 29. The direction of flow of the pressure medium flow is indicated in FIG. 3 by two directional arrows at the connection openings 29, 30 and in FIG. 1 by arrows in the channels 28, 35, 36.

Die Wirkungsweise des Wegeventils mit Dreiwege-Stromregler ist bekannt und beispielsweise in der DE 36 03 811 A1 beschrieben, so daß hier nur kurz und der Vollständigkeit halber darauf eingegangen wird.The mode of operation of the directional control valve with a three-way flow controller is known and is described, for example, in DE 36 03 811 A1, so that it is dealt with here only briefly and for the sake of completeness.

Wird durch Auslenkung des Steuerschiebers 40 ein Druckmittelstrom zu einem der Arbeitsanschlüsse 21, 22 gesteuert, so fließt dieser Druckmittelstrom ausgehend von der zweiten Anschlußöffnung 30 über den Einlaßkanal 35 in die innere Einlaßkammer 34 und von dort über die Radialbohrungen 52 und die Sackbohrung 50 des Regelschiebers 47 in die äußere Auslaßkammer 31 und gelangt von dort über den Kanal 36, die beiden Meßdrosselkammern 18, 19 den Arbeitskanal 23 unter Öffnen des Rückschlagventils 25 in die Zulaufkammer 15 und zu einem der beiden Arbeitsanschlüsse 21, 22. Das von der Meßdrosselstelle 20 zwischen den beiden Meßdrosselkammern 18, 19 ermittelte Druckgefälle liegt hierbei über die Verbindungsbohrung 51 zum Federraum 37 und über den Kanal 36 entgegengesetzt zur Kraft der Regelfeder 38 am Regelschieber 47 an und verschiebt diesen entgegen der Kraft der Regelfeder 38. Je größer die Druckdifferenz ist, desto weiter wird der Regelschieber 47 in Figur 1 nach links bewegt und desto stärker der Druckmittelstrom von der inneren Einlaßkammer 34 zu der äußeren Auslaßkammer 31 gedrosselt und ein anwachsender Druckmittelstrom von der inneren Einlaßkammer 34 zu der danebenliegenden Kammer 33 geleitet, von wo dieser Druckmittelstrom über die erste Anschlußöffnung 29 abfließt.If a pressure medium flow to one of the working connections 21, 22 is controlled by deflection of the control slide 40, this pressure medium flow flows from the second connection opening 30 via the inlet channel 35 into the inner inlet chamber 34 and from there via the radial bores 52 and the blind bore 50 of the control slide 47 into the outer outlet chamber 31 and from there passes via the channel 36, the two measuring throttle chambers 18, 19, the working channel 23 while opening the check valve 25 into the inlet chamber 15 and to one of the two working connections 21, 22. That of the measuring throttle point 20 between the two Measuring throttle chambers 18, 19 determined pressure drop is here via the connecting bore 51 to the spring chamber 37 and via the channel 36 opposite to the force of the Control spring 38 on the control slide 47 and moves it against the force of the control spring 38. The greater the pressure difference, the further the control slide 47 is moved to the left in FIG. 1 and the more the pressure medium flow is throttled from the inner inlet chamber 34 to the outer outlet chamber 31 and an increasing pressure medium flow is conducted from the inner inlet chamber 34 to the adjacent chamber 33, from where this pressure medium flow flows out via the first connection opening 29.

In Figur 2 ist ausschnittweise das beschriebene Wegeventil in Linksausführung dargestellt. Das Ventilgehäuse 10 ist unverändert und entspricht dem von Figur 1. Wie durch Pfeile in Figur 2 angedeutet ist, wird nunmehr Druckmittel über die erste Anschlußöffnung 29 dem Ventilgehäuse 10 zugeführt und über die zweite Anschlußöffnung 30 der nicht verbrauchte Druckmittelteilstrom abgeführt. Damit bildet nunmehr die erste Anschlußöffnung 29 die Zulauföffnung und die mittlere Kammer 32 die Einlaßöffnung des Dreiwege-Stromreglers. Durch diese Vertauschung der Funktion von erster und zweiter Anschlußöffnung 29, 30 ist es möglich, Ventilblöcke in Links- oder Rechtsausführung zu bilden, wobei Abflußöffnung des einen Wegeventils und Zuflußöffnung des anderen Wegeventils auf einander zugekehrten Seiten liegen.FIG. 2 shows a cutout of the directional control valve described in the left-hand version. The valve housing 10 is unchanged and corresponds to that of FIG. 1. As indicated by the arrows in FIG. 2, pressure medium is now supplied to the valve housing 10 via the first connection opening 29 and the unused pressure medium partial flow is discharged via the second connection opening 30. The first connection opening 29 thus now forms the inlet opening and the middle chamber 32 the inlet opening of the three-way flow regulator. This reversal of the function of the first and second connection openings 29, 30 makes it possible to form valve blocks in left-hand or right-hand execution, with the discharge opening of one directional control valve and the inflow opening of the other directional control valve lying on mutually facing sides.

Der Regelschieber 47' des Wegeventils für Linksausführung ist zur Sicherstellung der Regelfunktion geringfügig modifiziert, und zwar sind die Radialbohrungen 52 in einer solchen Querschnittsebene angeordnet, daß sie in der in Figur 2 dargestellten Grundstellung des Regelschiebers 47' im Bereich der die Zulaufkammer bildenden mittleren Kammer 32 liegen. Im übrigen ist das Wegeventil gemäß Figur 2 unverändert, so daß gleiche Bauteile mit gleichen Bezugszeichen versehen sind.The control slide 47 'of the directional control valve for the left-hand version is slightly modified to ensure the control function, namely the radial bores 52 are arranged in such a cross-sectional plane that they are in the basic position of the control slide 47' shown in FIG. 2 in the region of the central chamber 32 forming the inlet chamber lie. Otherwise, the directional control valve according to FIG. 2 is unchanged, so that the same components are provided with the same reference numerals.

Wird anstelle des Dreiwege-Stromreglers ein Zweiwege-Stromregler gewünscht, wie dieser beispielsweise in der DE 36 03 811 A1 (Figur 1) beschrieben ist, so kann dies durch eine geringfügige Nachbearbeitung des Ventilgehäuses 10 realisiert werden. Im Ventilgehäuse 10 werden von den beiden Anschlußöffnungen 29, 30 je eine Bohrung 56, 57 eingebracht, die sich einander durchdringen. Dies ist in Figur 3 und 4 dargestellt. Durch diese beiden Bohrungen 56, 57 sind die beiden Anschlußöffnungen 29, 30 unmittelbar verbunden. Alle Kammern 32, 33 und 34 sind nunmehr der Funktion nach Einlaßkammern, von denen jedoch entsprechend der Ausbildung des Regelschiebers 47 (Figur 1) oder 47' (Figur 2) nur die innere Kammer 34 oder die mittlere Kammer 32 wirksam ist. Für die Funktion des Zweiwege-Stromreglers kann jeder der beiden Regelschieber 47 bzw. 47' verwendet werden. Eingesetzt kann jedoch auch ein Regelschieber werden, bei dem die zusätzliche Ringnut 54 entfallen ist.If, instead of the three-way current regulator, a two-way current regulator is desired, as described, for example, in DE 36 03 811 A1 (FIG. 1), this can be achieved by slightly reworking the valve housing 10. A bore 56, 57 are made in the valve housing 10 from the two connection openings 29, 30, which penetrate one another. This is shown in Figures 3 and 4. Through these two holes 56, 57, the two connection openings 29, 30 are directly connected. All chambers 32, 33 and 34 are now the function of inlet chambers, of which only the inner chamber 34 or the middle chamber 32 is effective, however, depending on the design of the control slide 47 (FIG. 1) or 47 '(FIG. 2). Each of the two control slides 47 and 47 'can be used for the function of the two-way current regulator. However, a control slide can also be used, in which the additional annular groove 54 has been omitted.

In Figur 5 ist ausschnittweise das beschriebene Wegeventil in Rechtsausführung dargestellt, entsprechend der Rechtsausführung nach Figur 1, wobei jedoch anstelle des bisherigen Ventilgehäuses 10 ein anderes, zweites Ventilgehäuse 60 verwendet wird, das sich ebenfalls unverändert für eine Linksausführung verwenden läßt. Das zweite Ventilgehäuse 60 unterscheidet sich vom ersten Ventilgehäuse 10 lediglich dadurch, daß der bisherige Kanal 27 zwischen erster Anschlußöffnung 29 und vierter Kammer 32 entfällt; im zweiten Ventilgehäuse 60 ist lediglich die an die innere Kammer 34 angrenzende, mittlere Kammer 33 über den Kanal 28 mit der ersten Anschlußöffnung 29 verbunden. Die Bauweise des zweiten Ventilgehäuses 60 ist somit einfacher. Der als Hohlschieber ausgebildete Regelschieber 47 nach Figur 1 ist unverändert in das zweite Ventilgehäuse 60 eingebaut. Die Funktion des Wegeventils mit dem zweiten Ventilgehäuse 60 nach Figur 5 in Rechtsausführung ist gleich wie diejenige der Rechtsausführung nach Figur 1.5 shows a cutout of the directional control valve described in the right-hand version, corresponding to the right-hand version according to FIG. 1, but instead of the previous valve housing 10, another, second valve housing 60 is used, which can also be used unchanged for a left-hand version. The second valve housing 60 differs from the first valve housing 10 only in that the previous channel 27 between the first connection opening 29 and the fourth chamber 32 is omitted; in the second valve housing 60, only the middle chamber 33 adjoining the inner chamber 34 is connected to the first connection opening 29 via the channel 28. The construction of the second valve housing 60 is thus simpler. The control slide 47 designed as a hollow slide according to FIG. 1 is installed unchanged in the second valve housing 60. The function of the directional control valve with the second valve housing 60 according to FIG. 5 in the right-hand version is the same as that of the right-hand version according to FIG. 1.

Die Figur 6 zeigt ausschnittweise das beschriebene Wegeventil in einer Linksausführung unter Verwendung des zweiten Ventilgehäuses 60. Zur Sicherstellung der Stromregelung ist der Regelschieber 61 hier in Vollschieberbauweise ausgebildet, an dem die Ringnut 54 einerseits mit ihrer radialen Nutflanke die zweite Steuerkante 55 bildet, welche den Volumenstrom zwischen mittlerer Kammer 33 und innerer Kammer 34 bestimmt. Die andere Nutflanke bildet die erste Steuerkante 62, welche in Ausgangsstellung des Regelschiebers 61 an einem in der vierten Kammer 32 liegenden Kolbenabschnitt 63 liegt und die den Druckmittelstrom zwischen der als Einlaßkammer dienenden, mittleren Kammer 33 und der äußeren Auslaßkammer 31 einstellt. Der Regelschieber 61 ist wie der Hohlschieber 47 lediglich durch andere Bearbeitung aus einem Schieberrohling herstellbar und baut besonders einfach.6 shows a section of the directional control valve described in a left-hand version using the second valve housing 60. To ensure the flow control, the control slide 61 is designed here in a full slide design, on which the annular groove 54, on the one hand, forms the second control edge 55 with its radial groove flank, which forms the volume flow determined between the middle chamber 33 and the inner chamber 34. The other flank of the groove forms the first control edge 62 which, in the starting position of the control slide 61, lies on a piston section 63 located in the fourth chamber 32 and which adjusts the pressure medium flow between the middle chamber 33 serving as the inlet chamber and the outer outlet chamber 31. The control slide 61, like the hollow slide 47, can only be produced from a slide blank by other processing and is particularly simple.

Die Wirkungsweise der Linksführung nach Figur 6 entspricht im wesentlichen derjenigen der Linksausführung nach Figur 2, wobei jedoch der Volumenstrom zur Meßdrosselstelle über die mittlere Kammer 33 und infolge der Vollschieberbauweise durch die Längsbohrung 12 hindurch zur äußeren Kammer 31 geführt wird.The mode of operation of the left-hand guide according to FIG. 6 essentially corresponds to that of the left-hand version according to FIG. 2, but the volume flow to the measuring throttle point is guided via the central chamber 33 and, as a result of the full slide valve design, through the longitudinal bore 12 to the outer chamber 31.

Claims (8)

  1. Hydraulic directional valve in control devices for single-acting or double-acting power cylinders, in particular for driving power units on agricultural vehicles, having a valve housing which has:
    - at least seven chambers (13-19), which are configured as annular widenings of a longitudinal spool hole (11) and are arranged adjacent to one another on this spool hole (11), which is used to accommodate a control spool (40), of which chambers (13-19) a first and a second working chamber (14, 18) each connected to a working connection (21, 22) for a power cylinder are located on each side of a supply chamber (15), one return chamber (13, 17) connected to a return connection is located near one working chamber (14, 16) and a first metering throttle chamber (18) connected via a passage (23) to the supply chamber (15) is located near one return chamber (17) and a second metering throttle chamber (19) is located near the first metering throttle chamber (18),
    - three chambers (31, 33, 34) configured as annular widenings of a longitudinal hole (12), which is parallel to the spool hole (11) and is used for accommodating a regulating spool (47), of which chambers (31, 33, 34) the central chamber (33) is connected to a first connection opening (29) in a housing wall (101) of the valve housing (10), which housing wall (101) is parallel to the longitudinal hole and the spool hole, the outer chamber (31) facing towards the end of the hole is connected to the second metering throttle chamber (19) and the inner chamber (34) is connected to a second connection opening (30) in a housing wall (102) of the valve housing (10), which housing wall (102) is opposite the housing wall (101) containing the first connection opening (29), and
    - a spring space (37) configured in the longitudinal hole (12) in connection with the inner chamber (34) and used to accommodate a regulating spring (38), which spring space (37) is in connection with the passage (23) connecting the supply chamber (15) and the first metering throttle [sic] via a connecting hole (51),
    characterized in that, at the longitudinal hole (12) between the central and outer chambers (33, 31), a fourth chamber (32) is configured as an annular widening of the longitudinal hole (12).
  2. Valve according to Claim 1, having a regulating spool (47) displaceably guided in the longitudinal hole (12) of the valve housing (10), which regulating spool (47) has an axial pocket hole (50) which, after insertion of the regulating spool (47) into the longitudinal hole (12), is open to the outer chamber (31) functioning as the outlet chamber to the second metering throttle chamber (19) and the bottom of the pocket of which regulating spool forms a pressure surface, subjected to pressure medium flowing into the valve housing (10), opposing that end surface of the regulating spool (47) located in the spring space (37), and having at least one radial hole (52) opening, at one end, onto the periphery of the spool and, at the other end, into the pocket hole, the wall of which radial hole (52) forms a control edge (53) for setting a pressure medium flow to the outer chamber (31), characterized in that an annular groove (54) is introduced on the spool periphery of the regulating spool (47), one radial groove flank of which annular groove (54) forms a second control edge (55) for setting a pressure medium flow between the inner and central chambers (34, 33).
  3. Valve according to Claim 2, characterized in that the at least one radial hole (52) is arranged in such a way that, after insertion of the regulating spool (47) into the longitudinal hole (12) of the valve housing (10), the first control edge (53) sets the pressure medium flow between the central chamber (32), functioning as the inlet chamber, and the outer outlet chamber (31) (Figure 2).
  4. Valve according to Claim 2, characterized in that the at least one radial hole (52) is arranged in such a way that, after insertion of the regulating spool (47) into the longitudinal hole (12) of the valve housing (10), the first control edge (53) sets the pressure medium flow between the inner chamber (34), functioning as the inlet chamber, and the outer outlet chamber (31) (Figure 1).
  5. Valve according to Claim 1, characterized in that the first and second connection openings (29, 30) are connected together by connecting holes (56, 57) introduced from both connection openings (29, 30).
  6. Valve according to Claim 1, characterized in that it has a valve housing (60) in which, of the two central chambers (33, 32), only the chamber (33) adjacent to the inner chamber (34) is connected to the first connection opening (29) via a passage (28) and the other central chamber (32) is separated from the first connection opening (29) (Figures 5, 6).
  7. Valve according to Claim 6, in association with Claim 2 or 4, characterized in that the regulating spool (47) is configured as a hollow spool (Figure 5).
  8. Valve according to Claim 6, having a regulating spool (47) displaceably guided in the longitudinal hole (12) of the valve housing, which regulating spool (47) forms a pressure surface, subjected to pressure medium flowing into the valve housing (10), opposing that end surface of the regulating spool (47) located in the spring space (37), characterized in that the regulating spool is configured as a solid spool (61) and has, on the spool periphery, an annular groove (54), one of which radial groove flank forms a second control edge (55) for setting a pressure medium flow between the inner and central chambers (34, 33), whereas the other groove flank forms, on a land (63) located in the fourth chamber (32), a first control edge (62) which sets the pressure medium flow between the central chamber (33), functioning as the inlet chamber, and the outer outlet chamber (31), (Figure 6).
EP90121923A 1989-12-19 1990-11-16 Hydraulic control valve Expired - Lifetime EP0433665B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3941801 1989-12-19
DE3941801 1989-12-19
DE4018934 1990-06-13
DE4018934 1990-06-13

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Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3722543A (en) * 1971-11-02 1973-03-27 Hydraulic Industries Pressure compensated control valve
US4253482A (en) * 1979-03-05 1981-03-03 Gresen Manufacturing Company Hydraulic valve having pressure compensated demand flow
US4519419A (en) * 1982-06-15 1985-05-28 Commercial Shearing, Inc. Hydraulic valves
DE3603811C2 (en) * 1986-02-07 1995-12-21 Bosch Gmbh Robert Hydraulic directional valve

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ES2050335T3 (en) 1994-05-16
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