EP0214325A1 - Hydraulic directional-control valve - Google Patents

Hydraulic directional-control valve Download PDF

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Publication number
EP0214325A1
EP0214325A1 EP85111244A EP85111244A EP0214325A1 EP 0214325 A1 EP0214325 A1 EP 0214325A1 EP 85111244 A EP85111244 A EP 85111244A EP 85111244 A EP85111244 A EP 85111244A EP 0214325 A1 EP0214325 A1 EP 0214325A1
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EP
European Patent Office
Prior art keywords
channels
channel
central opening
bypass
check 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.)
Granted
Application number
EP85111244A
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German (de)
French (fr)
Other versions
EP0214325B1 (en
Inventor
Sabi Gavrilov Sabev
Stefan Dimitrov Lasarov
Dimiter Borissov Todorov
Darina Kusmanova Koparanova
Ivan Borissov Hristov
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V M E I "LENIN"
Vmei Lenin
Original Assignee
V M E I "LENIN"
Vmei Lenin
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Filing date
Publication date
Application filed by V M E I "LENIN", Vmei Lenin filed Critical V M E I "LENIN"
Priority to DE8585111244T priority Critical patent/DE3566822D1/en
Priority to EP85111244A priority patent/EP0214325B1/en
Priority to US06/788,076 priority patent/US4667698A/en
Publication of EP0214325A1 publication Critical patent/EP0214325A1/en
Application granted granted Critical
Publication of EP0214325B1 publication Critical patent/EP0214325B1/en
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • 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
    • 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
    • Y10T137/87169—Supply and exhaust
    • Y10T137/87177—With bypass
    • Y10T137/87185—Controlled by supply or exhaust valve
    • 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
    • Y10T137/87169—Supply and exhaust
    • Y10T137/87233—Biased exhaust valve
    • Y10T137/87241—Biased closed

Definitions

  • the invention relates to a hydraulic directional control valve with a body in which a central opening and associated supply channels and discharge channels as well as working channels and bypass channels are provided, and with a control slide arranged in the central opening, which has a central collar and end-facing collars between them Shaft sections are formed, and has a bypass groove at one end, the working channels extending perpendicular to the central opening and each being provided with a check valve.
  • the hydraulic directional valves are used in construction and road construction vehicles as well as in electric forklifts and diesel forklifts.
  • a hydraulic directional control valve is already known from US-A-4209031, which has a body with a central opening and associated supply channels, discharge channels, working channels and bypass channels.
  • a control rail in the central opening Arranged, which has a central collar and end collars for intermediate contact with the wall of the central opening and intermediate shaft sections with a smaller diameter than the collars and the same number of bypass channels provided.
  • a step-like opening is formed in the control slide, in which a small piston is arranged.
  • a groove is cut into the wall formed between the step-like opening and the outer surface of the control slide.
  • a check valve is arranged, which is controlled by a plunger, which is mounted perpendicular to the spool so that one end of its rod protrudes into the groove of the spool in front of the small piston, while the other end of the rod with the check valve connected is.
  • This known directional control valve is very complicated. To open the check valve, it is also necessary to apply a high pressure which must be maintained over the entire duration of an operation, for example the lowering of a load with a diesel forklift, which means a high expenditure of energy.
  • the object of the invention is to provide a much simpler hydraulic directional valve of the type mentioned, in which only a small actuating force to open the to reduce the energy expenditure, especially when lowering a load with the help of a diesel forklift Check valve is required.
  • This object is achieved in that the spaces formed by the shaft sections between the collars and the wall of the central opening are connected via an auxiliary channel.
  • the auxiliary channel can be formed in the central collar of the control slide or in the body of the directional valve.
  • the directional control valve according to the invention has a simple structure.
  • the force required to actuate the check valves is relatively small, so that, for example when the load is lowered on the forklift truck, only a small amount of energy is required for the check valve actuation.
  • the directional control valve shown in FIG. 1 in the form of a double-acting control unit has a body 1 with a central opening 2, with which a first discharge channel 3, a first working channel 4, a supplying channel 5, a second working channel 6, and a second discharging channel are arranged in succession Channel 7 and a bypass channel 8 are connected.
  • a control slide 9 Arranged in the central opening 2 is a control slide 9, which is composed of the following parts arranged one behind the other: a first end-side collar 10, a first shaft section 11, a middle collar 12, a second shaft section 13, a second end-side collar 14 and a bypass groove 15.
  • a check valve 17 is arranged in the working channel 4, and a check valve 18 is arranged in the working channel 6.
  • the bypass groove 15 is connected to the bypass channel 8.
  • the drainage channels 3 and 7 are covered by the end bundles 10 and 14, respectively.
  • the feed channel 5 is covered by the central collar 12.
  • the shaft sections 11 and 13 lie axially symmetrical to the axes of the working channels 4 and 6.
  • the spaces formed between the corresponding collars and the shaft sections 11 and 13 and the inner wall of the central opening 2 are connected in the embodiment shown in FIGS. 1 and 2 by an auxiliary channel 16 extending through the central collar 12.
  • the hydraulic directional control valve shown in FIGS. 1 and 2 operates as follows: When the control slide 9 is in its neutral position, hydraulic fluid conveyed by a pump of the hydraulic system flows back via the bypass channel 8 and the bypass groove 15 into a storage container. The work channels 4 and 6 connected to work spaces of a hydraulic drive controlled by the hydraulic directional control valve are closed by the check valves 17 and 18, respectively.
  • the bypass groove 8 closes due to the shifting of the bypass groove 15, as a result of which the hydraulic fluid conveyed by the pump is guided via the supplying channel 5 to the first working channel 4, whereby the check valve 17 arranged therein opens.
  • the delivery pressure of the pump is also applied to the second working channel 6 via the auxiliary channel 16, as a result of which the check valve 18 can be easily opened mechanically due to the prevailing pressure conditions.
  • the check valve 18 is opened and held mechanically in the open position via the shaft section 13 of the control slide 9.
  • the second end collar 14 of the control slide 9 releases the second discharge channel 7.
  • the hydraulic fluid conveyed by the pump is fed through the supply channel 5 past the check valve 17 to a working area of a hydraulic drive, while the hydraulic fluid flows back from the other working area via the check valve 18 and the second discharge channel 7 into the storage tank. In this operation, only a minimal part of the pump flow rate that enters the storage tank via the auxiliary channel 16 is lost.
  • the hydraulic directional control valve designed as a single-acting control unit has only one working channel 6 with a check valve 18.
  • a further bypass channel 19 is provided in the body 1 for interaction with the bypass groove 15.
  • an auxiliary channel 2 is formed in the body 1 in such a way that it accommodates the spaces formed by the shaft sections 11 and 13 between the collars and the inner wall of the central opening 2 Neutral position of the spool 9 connects.
  • the middle collar 12 of the control slide 9 covers the auxiliary channel 20 before the first end collar 10 releases the first discharge channel 3, so that first the All hydraulic fluid delivered is directed to the reflux chamber of the hydraulic drive. If the bypass duct 8 is then closed, the delivery pressure of the pump is via the supply duct 5 and the auxiliary duct 20 on the working duct 6 , whereby the check valve 18 is acted upon by this pressure and can be easily opened mechanically. The check valve 18 is opened and held mechanically in the open position by the shaft section 13 of the control slide 9.

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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)
  • Fluid-Pressure Circuits (AREA)

Abstract

Das hydraulische Wegeventil hat einen Körper 1 mit einer zentralen Öffnung 2, mit der zuleitende Kanäle 5 und ableitende Kanäle 3, 7 sowie Arbeitskanäle 4, 6 und Bypasskanäle 8, 19 verbunden sind. In der zentralen Öffnung 2 ist ein Steuerschieber 9 verschiebbar, der einen mittleren Bund 12 und endseitige Bunde 10, 14 aufweist, zwischen denen sich Schaftabschnitte 11, 13 erstrecken. An seinem einen Ende ist in dem Steuerschieber 9 eine Bypassnut 15 ausgebildet. Die Arbeitskanäle 4, 6 erstrecken sich senkrecht zur zentralen Öffnung 2 und sind jeweils mit einem Rückschlagventil 17, 18 versehen. Die von den Schaftabschnitten 11, 13 und der Wand der zentralen Öffnung 2 zwischen den Bunden gebildeten Räume sind durch einen entweder im mittleren Bund 12 oder im Körper 1 vorgesehenen Hilfskanal 16 bzw. 20 verbunden.The hydraulic directional control valve has a body 1 with a central opening 2, with which supply channels 5 and discharge channels 3, 7 as well as working channels 4, 6 and bypass channels 8, 19 are connected. In the central opening 2, a control slide 9 is displaceable, which has a central collar 12 and end collars 10, 14, between which shaft sections 11, 13 extend. At one end, a bypass groove 15 is formed in the control slide 9. The working channels 4, 6 extend perpendicular to the central opening 2 and are each provided with a check valve 17, 18. The spaces formed by the shaft sections 11, 13 and the wall of the central opening 2 between the collars are connected by an auxiliary channel 16 or 20 provided either in the central collar 12 or in the body 1.

Description

Die Erfindung betrifft ein hydraulisches Wegeventil mit einem Körper, in dem eine zentrale Öffnung und damit ver­bundene zuführende Kanäle und ableitende Kanäle sowie Ar­beitskanäle und Bypasskanäle vorgesehen sind, und mit einem in der zentralen Öffnung angeordneten Steuerschie­ber, der einen mittleren Bund und endseitige Bunde, zwi­schen denen Schaftabschnitte ausgebildet sind, und an ei­nem Ende einen Bypassnut aufweist, wobei die Arbeitskanäle sich senkrecht zur zentralen Öffnung erstrecken und je­weils mit einem Rückschlagventil versehen sind.The invention relates to a hydraulic directional control valve with a body in which a central opening and associated supply channels and discharge channels as well as working channels and bypass channels are provided, and with a control slide arranged in the central opening, which has a central collar and end-facing collars between them Shaft sections are formed, and has a bypass groove at one end, the working channels extending perpendicular to the central opening and each being provided with a check valve.

Die hydraulischen Wegeventile werden bei Bau- und Stras­senbaufahrzeugen sowie bei Elektrostaplern und Diesel-­Gabelstaplern verwendet.The hydraulic directional valves are used in construction and road construction vehicles as well as in electric forklifts and diesel forklifts.

Aus der US-A-4209031 ist bereits ein hydraulisches Wege­ventil bekannt, das einen Körper mit einer zentralen Öffnung und damit in Verbindung stehende zuleitende Ka­näle, ableitende Kanäle, Arbeitskanäle und Bypasskanäle aufweist. In der zentralen Öffnung ist ein Steuerschie­ ber angeordnet, der für den Kontakt mit der Wand der zen­tralen Öffnung einen mittleren Bund und endseitige Bunde sowie dazwischenliegende Schaftabschnitte mit geringerem Durchmesser als die Bunde und in gleicher Anzahl vorgese­hene Bypasskanäle aufweist. Im Steuerschieber ist eine stufenartige Öffnung ausgebildet, in der ein kleiner Kol­ben angeordnet ist. In die zwischen der stufenartigen Öff­nung und der Außenfläche des Steuerschiebers ausgebildete Wand ist eine Nut eingeschnitten. In dem einem Arbeitska­nal ist ein Rückschlagventil angeordnet, das über einen Stößel gesteuert wird, der senkrecht zum Steuerschieber so gelagert ist, daß das eine Ende seiner Stange in die Nut des Steuerschiebers vor dem kleinen Kolben ragt, wäh­rend das andere Ende der Stange mit dem Rückschlagventil verbunden ist.A hydraulic directional control valve is already known from US-A-4209031, which has a body with a central opening and associated supply channels, discharge channels, working channels and bypass channels. There is a control rail in the central opening Arranged, which has a central collar and end collars for intermediate contact with the wall of the central opening and intermediate shaft sections with a smaller diameter than the collars and the same number of bypass channels provided. A step-like opening is formed in the control slide, in which a small piston is arranged. A groove is cut into the wall formed between the step-like opening and the outer surface of the control slide. In one working channel a check valve is arranged, which is controlled by a plunger, which is mounted perpendicular to the spool so that one end of its rod protrudes into the groove of the spool in front of the small piston, while the other end of the rod with the check valve connected is.

Der Aufbau dieses bekannten Wegeventils ist sehr kompli­ziert. Zum Öffnen des Rückschlagventils ist außerdem das Anlegen eines hohen Drucks erforderlich, der über die ganze Dauer einer Operation, beispielsweise dem Absenken einer Last mit einem Diesel-Gabelstapler, aufrecht erhal­ten werden muß, was einen hohen Energieaufwand bedeutet.The construction of this known directional control valve is very complicated. To open the check valve, it is also necessary to apply a high pressure which must be maintained over the entire duration of an operation, for example the lowering of a load with a diesel forklift, which means a high expenditure of energy.

Die der Erfindung zugrunde liegende Aufgabe besteht nun darin, ein wesentlich einfacher gebautes hydraulisches Wegeventil der eingangs genannten Art zu schaffen, bei welchem zur Verringerung des Energieaufwandes, vor allem beim Absenken einer Last mit Hilfe eines Diesel-Gabel­staplers, nur eine geringe Betätigungskraft zum Öffnen des Rückschlagventils erforderlich ist.The object of the invention is to provide a much simpler hydraulic directional valve of the type mentioned, in which only a small actuating force to open the to reduce the energy expenditure, especially when lowering a load with the help of a diesel forklift Check valve is required.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die von den Schaftabschnitten zwischen den Bunden und der Wand der zentralen Öffnung gebildeten Räume über einen Hilfskanal verbunden sind.This object is achieved in that the spaces formed by the shaft sections between the collars and the wall of the central opening are connected via an auxiliary channel.

Dabei kann der Hilfskanal im mittleren Bund des Steuer­schiebers oder im Körper des Wegeventils ausgebildet wer­den.The auxiliary channel can be formed in the central collar of the control slide or in the body of the directional valve.

Das erfindungsgemäße Wegeventil hat einen einfachen Auf­bau. Die für die Betätigung der Rückschlagventile erfor­derliche Kraft ist relativ gering, so daß beispielsweise beim Absenken einer Last bei dem Gabelstapler für die Rückschlagventilbetätigung nur ein geringer Energieauf­wand erforderlich ist.The directional control valve according to the invention has a simple structure. The force required to actuate the check valves is relatively small, so that, for example when the load is lowered on the forklift truck, only a small amount of energy is required for the check valve actuation.

Anhand von Zeichnungen werden Ausführungsbeispiele der Erfindung näher erläutert. Es zeigt:

  • Fig. 1 im Längsschnitt eine erste Ausführungsform eines hydraulischen Wegeventils in Form einer doppelt wirkenden Vierwege-Dreistellungs-Steuereinheit,
  • Fig. 2 den Schnitt A-A von Fig. 1,
  • Fig. 3 im Längsschnitt eine zweite Ausführungsform eines hydraulischen Wegeventils in Form einer einfach wirkenden Dreiwege-Dreistellungs-Steuereinheit und
  • Fig. 4 den Schnitt A-A von Fig. 2.
Exemplary embodiments of the invention are explained in more detail with reference to drawings. It shows:
  • 1 shows in longitudinal section a first embodiment of a hydraulic directional valve in the form of a double-acting four-way three-position control unit,
  • 2 shows the section AA of Fig. 1,
  • Fig. 3 in longitudinal section a second embodiment of a hydraulic directional valve in the form of a single-acting three-way three-position control unit and
  • 4 shows the section AA of FIG. 2nd

Das in Fig. 1 gezeigte Wegeventil in Form einer doppelt wirkenden Steuereinheit hat einen Körper 1 mit einer zentralen Öffnung 2 , mit der nacheinander ein erster ableitender Kanal 3 , ein erster Arbeitskanal 4 , ein zuführender Kanal 5 , ein zweiter Arbeitskanal 6 , ein zweiter ableitender Kanal 7 und ein Bypasskanal 8 verbunden sind. In der zentralen Öffnung 2 ist ein Steuerschieber 9 angeordnet, der sich aus folgenden, hintereinander angeordneten Teilen zusammensetzt: Einem ersten endseitigen Bund 10 , einem ersten Schaftabschnitt 11 , einem mittleren Bund 12 , einem zweiten Schaftab­schnitt 13 , einem zweiten endseitigen Bund 14 und ei­nem Bypassnut 15 .The directional control valve shown in FIG. 1 in the form of a double-acting control unit has a body 1 with a central opening 2, with which a first discharge channel 3, a first working channel 4, a supplying channel 5, a second working channel 6, and a second discharging channel are arranged in succession Channel 7 and a bypass channel 8 are connected. Arranged in the central opening 2 is a control slide 9, which is composed of the following parts arranged one behind the other: a first end-side collar 10, a first shaft section 11, a middle collar 12, a second shaft section 13, a second end-side collar 14 and a bypass groove 15.

In dem Arbeitskanal 4 ist ein Rückschlagventil 17 , im Arbeitskanal 6 ein Rückschlagventil 18 angeordnet. In der Neutralstellung des Steuerschiebers 9 steht die Bypassnut 15 mit dem Bypasskanal 8 in Verbindung. Die ableitenden Kanäle 3 und 7 sind durch die endseiti­gen Bunde 10 bzw. 14 abgedeckt. Der zuführende Kanal 5 ist durch den mittleren Bund 12 abgedeckt. Die Schaftabschnitte 11 und 13 liegen axialsymmetrisch zu den Achsen der Arbeitskanäle 4 und 6 . Die zwischen den entsprechenden Bunden und den Schaftabschnitten 11 und 13 und der Innenwand der zentralen Öffnung 2 gebil­deten Räume sind bei der in Fig. 1 und 2 gezeigten Aus­führungsform durch einen sich durch den mittleren Bund 12 erstreckenden Hilfskanal 16 verbunden.A check valve 17 is arranged in the working channel 4, and a check valve 18 is arranged in the working channel 6. In the neutral position of the control slide 9, the bypass groove 15 is connected to the bypass channel 8. The drainage channels 3 and 7 are covered by the end bundles 10 and 14, respectively. The feed channel 5 is covered by the central collar 12. The shaft sections 11 and 13 lie axially symmetrical to the axes of the working channels 4 and 6. The spaces formed between the corresponding collars and the shaft sections 11 and 13 and the inner wall of the central opening 2 are connected in the embodiment shown in FIGS. 1 and 2 by an auxiliary channel 16 extending through the central collar 12.

Das in den Figuren 1 und 2 gezeigte hydraulische Wegeven­til arbeitet folgendermaßen: Wenn sich der Steuerschie­ber 9 in seiner Neutralstellung befindet, fließt von einer Pumpe des Hydrauliksystems geförderte Hydraulik­flüssigkeit über den Bypasskanal 8 und die Bypassnut 15 in einen Speicherbehälter zurück. Die mit Arbeitsräumen eines von dem hydraulischen Wegeventils gesteuerten Hydro­antriebs verbundenen Arbeitskanäle 4 und 6 werden von den Rückschlagventilen 17 bzw. 18 geschlossen.The hydraulic directional control valve shown in FIGS. 1 and 2 operates as follows: When the control slide 9 is in its neutral position, hydraulic fluid conveyed by a pump of the hydraulic system flows back via the bypass channel 8 and the bypass groove 15 into a storage container. The work channels 4 and 6 connected to work spaces of a hydraulic drive controlled by the hydraulic directional control valve are closed by the check valves 17 and 18, respectively.

Wenn der Steuerschieber 9 aus der Neutralstellung mit Hilfe eines nicht gezeigten Antriebs beispielsweise nach oben verschoben wird, wird durch die Verschiebung der Bypassnut 15 der Bypasskanal 8 geschlossen, wodurch die von der Pumpe geförderte Hydraulikflüssigkeit über den zuführenden Kanal 5 zum ersten Arbeitskanal 4 ge­leitet wird, wodurch das darin angeordnete Rückschlagven­til 17 öffnet. Gleichzeitig liegt der Förderdruck der Pumpe über den Hilfskanal 16 auch am zweiten Arbeits­kanal 6 an, wodurch dessen Rückschlagventil 18 auf­grund der herrschenden Druckverhältnisse mechanisch leicht geöffnet werden kann. Das Öffnen und das Halten des Rück­schlagventils 18 in der Offenstellung erfolgt mechanisch über den Schaftabschnitt 13 des Steuerschiebers 9 . Gleichzeitig setzt der zweite endseitige Bund 14 des Steuerschiebers 9 den zweiten ableitenden Kanal 7 frei. Die von der Pumpe geförderte Hydraulikflüssigkeit wird durch den zuführenden Kanal 5 vorbei am Rückschlag­ventil 17 einem Arbeitsraum eines Hydroantriebs zuge­führt, während die Hydraulikflüssigkeit aus dem anderen Arbeitsraum über das Rückschlagventil 18 und den zwei­ten ableitenden Kanal 7 in den Speicherbehälter zurück­fließt. Bei diesem Arbeitsvorgang geht nur ein minimaler Teil der Pumpendurchflußmenge verloren, die über den Hilfs­kanal 16 in den Speicherbehälter eintritt.If the control slide 9 is shifted upward from the neutral position with the aid of a drive (not shown), for example, the bypass groove 8 closes due to the shifting of the bypass groove 15, as a result of which the hydraulic fluid conveyed by the pump is guided via the supplying channel 5 to the first working channel 4, whereby the check valve 17 arranged therein opens. At the same time, the delivery pressure of the pump is also applied to the second working channel 6 via the auxiliary channel 16, as a result of which the check valve 18 can be easily opened mechanically due to the prevailing pressure conditions. The check valve 18 is opened and held mechanically in the open position via the shaft section 13 of the control slide 9. At the same time, the second end collar 14 of the control slide 9 releases the second discharge channel 7. The hydraulic fluid conveyed by the pump is fed through the supply channel 5 past the check valve 17 to a working area of a hydraulic drive, while the hydraulic fluid flows back from the other working area via the check valve 18 and the second discharge channel 7 into the storage tank. In this operation, only a minimal part of the pump flow rate that enters the storage tank via the auxiliary channel 16 is lost.

Wenn sich der Steuerschieber wieder in der Neutralstellung befindet, fließt Hydraulikflüssigkeit von der Pumpe über den Bypasskanal 8 in den Behälter zurück. Der mit dem Arbeitsraum des Hydroantriebs verbundene Arbeitskanal 6 wird vom Rückschlagventil 18 geschlossen.When the control slide is again in the neutral position, hydraulic fluid flows back from the pump via the bypass channel 8 into the container. The working channel 6 connected to the working space of the hydraulic drive is closed by the check valve 18.

Wenn der Steuerschieber 9 aus seiner Neutralstellung nach unten bewegt wird, wird der Bypasskanal 8 wieder gechlossen. Die von der Pumpe geförderte Hydraulikflüs­sigkeit strömt durch den zuführenden Kanal 5 zum Ar­beitskanal 6 , dessen Rückschlagventil 18 öffnet. Durch den durch den mittleren Bund 12 gehenden Hilfskanal 16 wird das erste Rückschlagventil 17 des Arbeitskanals 4 mit Druck beaufschlagt, so daß es leicht geöffnet werden kann.When the control slide 9 is moved downward from its neutral position, the bypass channel 8 is closed again. The hydraulic fluid delivered by the pump flows through the supply channel 5 to the working channel 6, the check valve 18 of which opens. Through the auxiliary channel 16 passing through the central collar 12, the first check valve 17 of the working channel 4 is pressurized so that it can be opened easily.

Bei der in Figur 3 und 4 gezeigten Ausführungsform hat das als einzeln wirkende Steuereinheit ausgebildete hy­draulische Wegeventil nur einen Arbeitskanal 6 mit ei­nem Rückschlagventil 18 . Im Körper 1 ist neben dem Bypasskanal 8 ein weiterer Bypasskanal 19 für das Zu­sammenwirken mit der Bypassnut 15 vorgesehen. Anstelle des bei der Ausführungsform von Fig. 1 durch ein mittle­ren Bund 12 hindurchgehenden Hilfskanals 16 ist im Körper 1 ein Hilfskanal 2 derart ausgebildet, daß er die von den Schaftabschnitten 11 und 13 zwischen den Bunden und der Innenwand der zentralen Öffnung 2 gebil­deten Räume in der Neutralstellung des Steuerschiebers 9 verbindet.In the embodiment shown in FIGS. 3 and 4, the hydraulic directional control valve designed as a single-acting control unit has only one working channel 6 with a check valve 18. In addition to the bypass channel 8, a further bypass channel 19 is provided in the body 1 for interaction with the bypass groove 15. Instead of the auxiliary channel 16 passing through a central collar 12 in the embodiment of FIG. 1, an auxiliary channel 2 is formed in the body 1 in such a way that it accommodates the spaces formed by the shaft sections 11 and 13 between the collars and the inner wall of the central opening 2 Neutral position of the spool 9 connects.

Wenn der Steuerschieber des hydraulischen Wegeventils in der Ausführung der Figuren 3 und 4 beispielsweise nach unten bewegt wird, deckt der mittlere Bund 12 des Steuerschiebers 9 den Hilfskanal 20 ab, ehe der er­ste endseitige Bund 10 den ersten ableitenden Kanal 3 freigibt , so daß zunächst die gesamte geförderte Hy­draulikflüssigkeit zum Rückflußraum des Hydroantriebs geleitet wird. Wenn dann der Bypasskanal 8 geschlossen wird, liegt der Förderdruck der Pumpe über den zuführen­den Kanal 5 und den Hilfskanal 20 am Arbeitskanal 6 an,wodurch das Rückschlagventil 18 mit diesem Druck be­aufschlagt wird und mechanisch leicht geöffnet werden kann. Das Öffnen und Halten des Rückschlagventils 18 in der Offenstellung erfolgt mechanisch durch den Schaft­abschnitt 13 des Steuerschiebers 9 . Wenn der zweite endseitige Bund 14 des Steuerschiebers 9 den zweiten ableitenden Kanal 7 freigibt, strömt die Hydraulikflüs­sigkeit aus dem Arbeitsraum des Hydroantriebs über das Rückschlagventil 18 und den zweiten ableitenden Kanal 7 in den Speicherbehälter zurück. Gleichzeitig kommt die Bypassnut 15 mit dem zweiten Bypasskanal 19 in Fluchtung, so daß von der Pumpe geförderte Hydraulik­flüssigkeit in den Behälter zurückströmen kann.If the control slide of the hydraulic directional control valve in the embodiment of FIGS. 3 and 4 is moved downward, for example, the middle collar 12 of the control slide 9 covers the auxiliary channel 20 before the first end collar 10 releases the first discharge channel 3, so that first the All hydraulic fluid delivered is directed to the reflux chamber of the hydraulic drive. If the bypass duct 8 is then closed, the delivery pressure of the pump is via the supply duct 5 and the auxiliary duct 20 on the working duct 6 , whereby the check valve 18 is acted upon by this pressure and can be easily opened mechanically. The check valve 18 is opened and held mechanically in the open position by the shaft section 13 of the control slide 9. When the second end collar 14 of the control slide 9 releases the second discharge channel 7, the hydraulic fluid flows out of the working space of the hydraulic drive via the check valve 18 and the second discharge channel 7 back into the storage container. At the same time, the bypass groove 15 comes into alignment with the second bypass channel 19, so that hydraulic fluid delivered by the pump can flow back into the container.

Claims (3)

1. Hydraulische Wegeventil mit einem Körper (1), in dem eine zentrale Öffnung (2) und damit verbundene zufüh­rende Kanäle (5) und ableitende Kanäle (3, 7) sowie Arbeitskanäle (4, 6) und Bypasskanäle (8, 19) vorgese­hen sind, und mit einem in der zentralen Öffnung (2) angeordneten Steuerschieber (9), der einen mittleren Bund (12) und endseitige Bunde (10, 14), zwischen de­nen Schaftabschnitte (11, 13) ausgebildet sind, und an einem Ende eine Bypassnut (15) aufweist, wobei die Arbeitskanäle (4, 6) sich senkrecht zur zentralen Öff­nung (2) erstrecken und jeweils mit einem Rückschlag­ventil (17, 18) versehen sind, dadurch gekenn­zeichnet, daß die von den Schaftabschnitten (11, 13) zwischen den Bunden (10, 12, 14) und der Wand der zentralen Öffnung (2) gebildeten Räume über einen Hilfskanal (16, 20) verbunden sind.1. Hydraulic directional valve with a body (1) in which a central opening (2) and associated supply channels (5) and discharge channels (3, 7) as well as working channels (4, 6) and bypass channels (8, 19) are provided and with a control slide (9) arranged in the central opening (2), which has a central collar (12) and end collars (10, 14), between which shaft sections (11, 13) are formed, and one end Bypass groove (15), wherein the working channels (4, 6) extend perpendicular to the central opening (2) and are each provided with a check valve (17, 18), characterized in that between the shaft sections (11, 13) the bundles (10, 12, 14) and the wall of the central opening (2) are formed by an auxiliary channel (16, 20). 2. Hydraulisches Wegeventil nach Anspruch 1, dadurch gekennzeichnet, daß der Hilfskanal (16) im mittleren Bund (12) des Steuerschiebers (9) ausge­bildet ist.2. Hydraulic directional valve according to claim 1, characterized in that the auxiliary channel (16) in the central collar (12) of the control slide (9) is formed. 3. Hydraulisches Wegeventil nach Anspruch 1, dadurch gekennzeichnet, daß der Hilfskanal (20) im Körper (1) ausgebildet ist.3. Hydraulic directional valve according to claim 1, characterized in that the auxiliary channel (20) is formed in the body (1).
EP85111244A 1985-09-05 1985-09-05 Hydraulic directional-control valve Expired EP0214325B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE8585111244T DE3566822D1 (en) 1985-09-05 1985-09-05 Hydraulic directional-control valve
EP85111244A EP0214325B1 (en) 1985-09-05 1985-09-05 Hydraulic directional-control valve
US06/788,076 US4667698A (en) 1985-09-05 1985-10-16 Hydraulic distributor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP85111244A EP0214325B1 (en) 1985-09-05 1985-09-05 Hydraulic directional-control valve

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EP0214325A1 true EP0214325A1 (en) 1987-03-18
EP0214325B1 EP0214325B1 (en) 1988-12-14

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EP0636814B1 (en) * 1993-07-30 1997-09-03 Oddone Vanzini A mechnical transmission for drive wheels, especialy for mobile work machines
DE19531731C2 (en) * 1995-08-29 1998-10-08 Daimler Benz Ag Servo valve
CN103322239B (en) * 2013-06-26 2015-08-19 邱金成 A kind of three lumen type 3-position 4-way gas control commutation hydrovalves
IT201900016823A1 (en) * 2019-09-20 2021-03-20 Atlantic Fluid Tech S R L Control Device of a Hydraulic Actuator

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US2572705A (en) * 1950-05-04 1951-10-23 Deere Mfg Co Fluid control valve with selective float position
US2579134A (en) * 1948-03-31 1951-12-18 Deere Mfg Co Valve control means for fluid pressure systems
US2592906A (en) * 1945-11-05 1952-04-15 Deere Mfg Co Speed control valve for hydraulic mechanism

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US2579134A (en) * 1948-03-31 1951-12-18 Deere Mfg Co Valve control means for fluid pressure systems
US2572705A (en) * 1950-05-04 1951-10-23 Deere Mfg Co Fluid control valve with selective float position

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US4667698A (en) 1987-05-26
EP0214325B1 (en) 1988-12-14
DE3566822D1 (en) 1989-01-19

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