EP0214325B1 - Hydraulic directional-control valve - Google Patents

Hydraulic directional-control valve Download PDF

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Publication number
EP0214325B1
EP0214325B1 EP85111244A EP85111244A EP0214325B1 EP 0214325 B1 EP0214325 B1 EP 0214325B1 EP 85111244 A EP85111244 A EP 85111244A EP 85111244 A EP85111244 A EP 85111244A EP 0214325 B1 EP0214325 B1 EP 0214325B1
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EP
European Patent Office
Prior art keywords
channel
channels
central opening
control valve
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.)
Expired
Application number
EP85111244A
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German (de)
French (fr)
Other versions
EP0214325A1 (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"
Original Assignee
V M E I "LENIN"
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Publication date
Application filed by V M E I "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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    • 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 connected 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 which has a body with a central opening and associated supply channels, discharge channels, working channels and bypass channels.
  • a control slide is arranged in the central opening, which has a central collar and end-side collars for intermediate contact with the wall of the central opening, as well as intermediate shaft sections with a smaller diameter than the collars and bypass channels provided in the same number.
  • 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 spool 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, only a small amount of energy is required for lowering a load on the forklift 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 supply channel 5, a second working channel 6, a second discharging channel are arranged in succession Channel 7 and a bypass channel 8 are connected.
  • a control slide 9 is arranged in the central opening 2 and 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 in the embodiment shown in FIGS. 1 and 2 by a connected by the central collar 12 extending auxiliary channel 16.
  • 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 via the bypass channel 8 and the bypass groove 15 into a storage container back.
  • 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 by shifting 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 work area of a hydraulic drive, while the hydraulic fluid flows back from the other work 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 for interacting with the bypass groove 15.
  • an auxiliary channel 20 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 control slide 9 connects.
  • control slide 9 of the hydraulic directional control valve in the embodiment of FIGS. 3 and 4 is moved downward, for example, the bypass channel is closed, after which the hydraulic fluid conveyed by the pump is passed via the supply channel 5 to the working channel 6 and the check valve 18 opens.
  • the middle collar 12 of the control slide 9 covers the auxiliary channel 20 before the first end collar 10 releases the first discharging channel 3, so that the entire hydraulic fluid delivered is directed to the working area of the hydraulic drive.
  • the bypass channel 8 is closed.
  • the delivery pressure of the pump is applied to the working channel 6 via the supply channel 5 and the auxiliary channel 20, as a result of which this pressure is applied to the check valve 18 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.
  • the second end collar 14 of the control slide 9 releases the second discharge channel 7
  • the hydraulic fluid flows out of the working area of the hydraulic drive via the check valve 18 and the second discharge channel 7 back into the storage container.
  • 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.

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 Offnung angeordneten Steuerschieber, der einen mittleren Bund und endseitige Bunde, zwischen denen Schaftabschnitte ausgebildet sind, und an einem Ende eine 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 connected 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-4 209 031 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 Steuerschieber 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 einen 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.From US-A-4 209 031 a hydraulic directional control valve is already known, which has a body with a central opening and associated supply channels, discharge channels, working channels and bypass channels. A control slide is arranged in the central opening, which has a central collar and end-side collars for intermediate contact with the wall of the central opening, as well as intermediate shaft sections with a smaller diameter than the collars and bypass channels provided in the same number. 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 Hilf skanal im mittleren Bund des Steuerschiebers oder im Körper des Wegeventils ausgebildet werden.The auxiliary channel can be formed in the central collar of the spool 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, only a small amount of energy is required for lowering a load on the forklift 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 A - A 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 A - A 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 aneordneten 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 Bypassnut15.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 supply channel 5, a second working channel 6, a second discharging channel are arranged in succession Channel 7 and a bypass channel 8 are connected. A control slide 9 is arranged in the central opening 2 and 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 in the embodiment shown in FIGS. 1 and 2 by a connected by the central collar 12 extending auxiliary channel 16.

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 via the bypass channel 8 and the bypass groove 15 into a storage container back. 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 by shifting 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 work area of a hydraulic drive, while the hydraulic fluid flows back from the other work 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 geschlossen. 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 den mittleren Bund 12 hindurchgehenden Hilfskanals 16 ist im Körper 1 ein Hilfskanal 20 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 the body 1, in addition to the bypass channel 8, a further bypass channel 19 is provided for interacting with the bypass groove 15. Instead of the auxiliary channel 16 passing through the central collar 12 in the embodiment of FIG. 1, an auxiliary channel 20 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 control slide 9 connects.

Wenn der Steuerschieber 9 des hydraulischen Wegeventils in der Ausführung der Figuren 3 und 4 beispielsweise nach unten bewegt wird, wird der Bypasskanal geschlossen, wonach die von der Pumpe geförderte Hydraulikflüssigkeit über den zuführenden Kanal 5 zu dem Arbeitskanal 6 geleitet wird und das Rückschlagventil 18 öffnet. Der mittlere Bund 12 des Steuerschiebers 9 deckt den Hilfskanal 20 ab, ehe der erste endseitige Bund 10 den ersten ableitenden Kanal 3 freigibt, so daß die gesamte geförderte Hydraulikflüssigkeit zum Arbeitsraum des Hydroantriebs geleitet wird. Wenn der Steuerschieber 9 beispielsweise aus der Neutralstellung nach oben bewegt wird, wird der Bypasskanal 8 geschlossen. Der Förderdruck der Pumpe liegt 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 9 of the hydraulic directional control valve in the embodiment of FIGS. 3 and 4 is moved downward, for example, the bypass channel is closed, after which the hydraulic fluid conveyed by the pump is passed via the supply channel 5 to the working channel 6 and the check valve 18 opens. The middle collar 12 of the control slide 9 covers the auxiliary channel 20 before the first end collar 10 releases the first discharging channel 3, so that the entire hydraulic fluid delivered is directed to the working area of the hydraulic drive. When the control slide 9 is moved upward from the neutral position, for example, the bypass channel 8 is closed. The delivery pressure of the pump is applied to the working channel 6 via the supply channel 5 and the auxiliary channel 20, as a result of which this pressure is applied to the check valve 18 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 area 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. Hydraulic directional-control valve with a body (1), in which are provided a central opening (2) and supply channels (5) and discharge channels (3, 7) connected thereto, as well as working channels (4, 6) and by-pass channels (8, 19), and with a spool valve (9) arranged in the central opening (2), which valve has a middle band (12) and end-side bands (10,14), between which shaft sections (11, 13) are formed, and has at one end a by-pass groove (15), wherein the working channels (4,6) extend perpendicular to the central opening (2) and in each case are equipped with a non-return valve (17,18), characterised in that the spaces formed by the shaft sections (11, 13) between the bands (10, 12, 14) and the wall of the central opening (2) are connected by way of an auxiliary channel (16, 20).
2. Hydraulic directional-control valve according to claim 1, characterised in that the auxiliary channel (16) is formed in the middle band (12) of the spool valve (9).
3. Hydraulic directional-control valve according to claim 1, characterised 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

Publications (2)

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

Family

ID=8193741

Family Applications (1)

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

Country Status (3)

Country Link
US (1) US4667698A (en)
EP (1) EP0214325B1 (en)
DE (1) DE3566822D1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE157753T1 (en) * 1993-07-30 1997-09-15 Oddone Vanzini MECHANICAL TRANSMISSION FOR DRIVE WHEELS, ESPECIALLY FOR MOBILE WORK MACHINERY
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

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4209031A (en) * 1978-02-01 1980-06-24 General Signal Corporation Positive control valve assembly

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2592906A (en) * 1945-11-05 1952-04-15 Deere Mfg Co Speed control valve for hydraulic mechanism
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
US3216448A (en) * 1963-02-25 1965-11-09 Parker Hannifin Corp Spool valve assembly
US3854499A (en) * 1973-03-26 1974-12-17 Gen Signal Corp Valve

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4209031A (en) * 1978-02-01 1980-06-24 General Signal Corporation Positive control valve assembly

Also Published As

Publication number Publication date
EP0214325A1 (en) 1987-03-18
DE3566822D1 (en) 1989-01-19
US4667698A (en) 1987-05-26

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