EP1215397B1 - Directional valve block - Google Patents

Directional valve block Download PDF

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Publication number
EP1215397B1
EP1215397B1 EP20010124579 EP01124579A EP1215397B1 EP 1215397 B1 EP1215397 B1 EP 1215397B1 EP 20010124579 EP20010124579 EP 20010124579 EP 01124579 A EP01124579 A EP 01124579A EP 1215397 B1 EP1215397 B1 EP 1215397B1
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EP
European Patent Office
Prior art keywords
pressure
directional control
connection
valve block
control valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP20010124579
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German (de)
French (fr)
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EP1215397A2 (en
EP1215397A3 (en
Inventor
Wolfgang Koetter
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP1215397A3 publication Critical patent/EP1215397A3/en
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Publication of EP1215397B1 publication Critical patent/EP1215397B1/en
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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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
    • F15B11/168—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load with an isolator valve (duplicating valve), i.e. at least one load sense [LS] pressure is derived from a work port load sense pressure but is not a work port pressure itself
    • 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
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/024—Installations or systems with accumulators used as a supplementary power source, e.g. to store energy in idle periods to balance pump load
    • 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
    • F15B11/165—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load for adjusting the pump output or bypass in response to demand
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20538—Type of pump constant capacity
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
    • F15B2211/212—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being accumulators
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
    • F15B2211/3053—In combination with a pressure compensating valve
    • F15B2211/30535—In combination with a pressure compensating valve the pressure compensating valve is arranged between pressure source and directional control valve
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3105—Neutral or centre positions
    • F15B2211/3111—Neutral or centre positions the pump port being closed in the centre position, e.g. so-called closed centre
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3144—Directional control characterised by the positions of the valve element the positions being continuously variable, e.g. as realised by proportional 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
    • F15B2211/3157—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line
    • F15B2211/31582—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line having multiple pressure sources and a single output member
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/327—Directional control characterised by the type of actuation electrically or electronically
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/605—Load sensing circuits
    • F15B2211/6051—Load sensing circuits having valve means between output member and the load sensing circuit
    • F15B2211/6054—Load sensing circuits having valve means between output member and the load sensing circuit using shuttle valves

Definitions

  • the invention is based on a directional control valve for use in a demand-current-controlled control arrangement (load sensing control device) according to the type specified in detail in the preamble of claim 1.
  • the invention further relates to a directional control valve block in demand-controlled design
  • a directional control valve block is used in practice, for example in a working hydraulics of a vehicle.
  • a so-called "load sensing” (LS) - directional control valve block is used to control connected consumers, as described in the German publication Götz. W .: “Hydraulics in theory and practice", Bosch training, OMEGON technical literature 1997, page 266, is known.
  • LS-way valve block a variable load pressure is sampled in the load ports and further processed in a scheme.
  • the LS-way valve block has a plurality of directional valves, which are connected in parallel, so that a plurality of directional valves can be actuated simultaneously.
  • the directional control valves are selected via shuttle valves and the highest pressure of a pressure compensator in a connection plate is supplied. This arrangement corresponds to a 3-way current regulator.
  • each directional valve of the directional control valve block can be connected in a working position of the directional control valve either with a control pressure port Y, with a return R and / or with a pump port P.
  • predetermined consumers can be supplied with pressure medium, so that e.g. a lifting device of the vehicle or the like, is movable in a predetermined position.
  • the well-known LS-way valve block can z. B. used in agricultural vehicles such as combine harvesters.
  • a hydraulic control device for a linear actuator is described in DE-A-39 30 553.
  • the control device is designed as a directional control valve block in load-sensing technique.
  • a directional control valve is connected to a lifting cylinder. In a lowering position of the directional control valve, oil flowing back from the cylinder is fed via a loading channel to a pressure compensator in order to fill a reservoir. Depending on the pressure of the returning oil and the pressure prevailing in the memory, the oil flowing back through the pressure compensator either a return or the memory is supplied.
  • a control hydraulics for a wheel loader is described in US-A-5 720 214.
  • a plurality of directional control valves which serve to actuate lifting and tilting cylinders of the blade, are connected in the form of a throttle control.
  • Another directional control valve is connected downstream of the first control block in series in order to actuate an additional lifting mechanism.
  • a speed limitation with rapid relief of a drive motor of the vehicle is possible and / or a spring-loaded parking brake of the vehicle solvable.
  • valve block the control pressure port, which is relieved in the neutral position to the return pressurized.
  • the pressure build-up is usually at this directional control valve block by an additional Magnetic valve realized, which connects the pressure in pressure to the control pressure port to the pump port P.
  • This additional valve can eg a from the German publication Götz. W .: “Hydraulics in theory and practice", Bosch training, OMEGON specialist literature 1997, page 268, be known LS special valve without consumer connections, which fills a memory for performing additional functions with pressure medium in a predetermined position.
  • LS directional control valve block which has one or more load-controlling directional control valves and a connecting plate connected to the directional control valves, to which a pump is connected, and a pressure compensator in the connection plate, on the one hand is acted upon by pump pressure and on the other hand acted upon by a signal taken to the consumer signal pressure and a regulator spring.
  • the LS hydraulic acts as a vehicle brake.
  • the directional control valve block has an additional 3/2-way solenoid valve in the connection plate.
  • the 3/2 solenoid valve establishes a connection between the control pressure port Y and the pump pressure port P for pressure buildup. Also in this known LS-way valve block thus an additional solenoid valve is required to build up pressure.
  • the directional control valve block according to the invention with the features of claim 1 has the advantage that an existing directional control valve can be used to build up pressure for additional functions, so that no additional valve is required for this purpose. This not only requires less piping and installation space, but also reduces overall costs.
  • the directional control valve can perform the conventional functions, i. make it possible to supply the connected consumers, and on the other hand allow in a further provided position pressure buildup in a memory to perform predetermined additional functions with the working hydraulics of the vehicle can.
  • the directional control valve block according to the invention can preferably be a spring-loaded parking brake of the vehicle and / or a speed limitation with rapid relief of the drive motor of the vehicle or the like as additional functions are performed without design changes to the directional control valve block according to the invention must be made.
  • the directional control valve according to the invention can be integrated in the directional control valve block or in the working hydraulics of the vehicle.
  • several directional control valves with such an intermediate position, in which the consumers are not connected to the directional control valve be equipped.
  • the principle of operation of the directional control valve block according to the invention in which the pressure generation for additional functions without additional components with a slider variant can be integrated inexpensively with the help of the control electronics in directional control valve block, can be applied to all electrically operated LS-way valves.
  • connection plate 2 includes a pressure limiting valve 4 and a pressure compensator 5, which is connected to a pump 6 connected to the connection plate 2.
  • the present directional control valve block 1 represents a so-called LS (Load Sensing) -way valve block, where "load sensing" means that the variable load pressure is sampled in the load ports and is further processed in a control.
  • LS Load Sensing
  • the directional control valve block 1 in the present case has two directional control valves 7 and 8 which are parallel to one another. To separate the load pressures of different consumers they are selected via shuttle valves 11, wherein the respective highest pressure of the pressure compensator 5 is supplied.
  • This design in the form of a three-way current regulator, offers significant advantages for practical operation.
  • the directional control valves 7, 8 each have consumer ports A and B, a return R, a pump port P and a control pressure port Y.
  • the directional control valve 7 has three positions, wherein a neutral position with 0 and the two working positions with I and II are designated.
  • the directional control valve 8 has, in addition to the positions 0, I, II an additional intermediate position III.
  • this intermediate position III the consumer ports A, B are closed and the control pressure port Y connected to the pump pressure port P.
  • a connected via the end plate 3 to the directional control valve block 1 memory 9 can be filled with pressure medium via the directional control valve 8.
  • the pressure build-up in the memory 9 takes place in dependence on a corresponding signal of a pressure switch 10, which is coupled to the directional control valve block 1.
  • Figure 2 shows a section of the directional control valve block 1 according to the invention, in which the directional control valve 8 is shown with the intermediate position III.
  • FIG. 3 shows a diagram in which a predetermined control sequence 0-I-II of the directional control valve 8 is shown.
  • This control is first switched from the neutral position 0 in the intermediate position III and then in the working position I.
  • the diagram shows the pump pressure (P d ) volumetric flow (Q) over a solenoid current (I) for driving the proportional directional control valve 8.
  • a response to pressure build-up I1 in the memory 9 has a sufficient distance to the start of a work function I2.
  • a maximum pump pressure or pressure limiting valve (DBV) pressure P DBV is reached, which decreases in the working position I to a required load pressure P load as soon as an oil flow flows to a consumer.
  • DBV maximum pump pressure or pressure limiting valve
  • the volume flow Q in the working position I of the directional control valve 8 increases continuously until the consumer is supplied with oil, and then has a constant course.

Description

Stand der TechnikState of the art

Die Erfindung geht von einem Wegeventil zum Einsatz in einer bedarfstromgeregelten Steueranordnung (Load Sensing Steuervorrichtung) nach der im Oberbegriff des Anspruchs 1 näher bezeichneten Art aus. Die Erfindung betrifft des Weiteren einen Wegeventilblock in bedarfstromgeregelter AusführungThe invention is based on a directional control valve for use in a demand-current-controlled control arrangement (load sensing control device) according to the type specified in detail in the preamble of claim 1. The invention further relates to a directional control valve block in demand-controlled design

Ein Wegeventilblock wird in der Praxis z.B. in einer Arbeitshydraulik eines Fahrzeuges eingesetzt. Dabei wird beispielsweise ein sogenannter "Load Sensing" (LS) - Wegeventilblock zum Ansteuern von angeschlossenen Verbrauchern verwendet, wie er aus der deutschen Publikation Götz. W.: "Hydraulik in Theorie und Praxis", Bosch Schulung, OMEGON Fachliteratur 1997, Seite 266, bekannt ist. Bei dem LS-Wegeventilblock wird ein variabler Lastdruck in den Verbraucheranschlüssen abgetastet und in einer Regelung weiterverarbeitet. Der LS-Wegeventilblock weist mehrere Wegeventile auf, die parallel zueinander geschaltet sind, so daß mehrere Wegeventile gleichzeitig betätigbar sind. Um die Lastdrücke verschiedener Verbraucher zu trennen, werden die Wegeventile über Wechselventile ausgewählt und der jeweils höchste Druck einer Druckwaage in einer Anschlussplatte zugeführt. Diese Anordnung entspricht einem 3-Wege-Stromregler.A directional control valve block is used in practice, for example in a working hydraulics of a vehicle. In this case, for example, a so-called "load sensing" (LS) - directional control valve block is used to control connected consumers, as described in the German publication Götz. W .: "Hydraulics in theory and practice", Bosch training, OMEGON technical literature 1997, page 266, is known. In the LS-way valve block, a variable load pressure is sampled in the load ports and further processed in a scheme. The LS-way valve block has a plurality of directional valves, which are connected in parallel, so that a plurality of directional valves can be actuated simultaneously. In order to separate the load pressures of different consumers, the directional control valves are selected via shuttle valves and the highest pressure of a pressure compensator in a connection plate is supplied. This arrangement corresponds to a 3-way current regulator.

Die Verbraucheranschlüsse jedes Wegeventils des Wegeventilblocks können in einer Arbeitsstellung des Wegeventils entweder mit einem Steuerdruckanschluß Y, mit einem Rücklauf R und/oder mit einem Pumpenanschluß P verbunden werden.The consumer ports of each directional valve of the directional control valve block can be connected in a working position of the directional control valve either with a control pressure port Y, with a return R and / or with a pump port P.

Auf diese Weise können mit dem Wegeventilblock vorbestimmte Verbraucher mit Druckmittel versorgt werden, so dass z.B. eine Hubeinrichtung des Fahrzeuges oder dergleichen, in eine vorbestimmte Stellung bewegbar ist. Der bekannte LS-Wegeventilblock kann z. B. bei landwirtschaftlich genutzten Fahrzeugen wie Mähdreschern eingesetzt werden.In this way, with the directional control valve block predetermined consumers can be supplied with pressure medium, so that e.g. a lifting device of the vehicle or the like, is movable in a predetermined position. The well-known LS-way valve block can z. B. used in agricultural vehicles such as combine harvesters.

Eine hydraulische Steuereinrichtung für einen Hubantrieb beschreibt die DE-A-39 30 553. Die Steuereinrichtung ist als Wegeventilblock in Load-Sensing Technik ausgeführt. Ein Wegeventil ist mit einem Hubzylinder verbunden. In einer Senken-Stellung des Wegeventils wird von dem Zylinder zurückströmendes Öl über einen Ladekanal einer Druckwaage zugeführt, um einen Speicher aufzufüllen. In Abhängigkeit von dem Druck des zurückströmenden Öls und dem im Speicher herrschenden Druck wird das zurückströmende Öl durch die Druckwaage entweder einem Rücklauf oder dem Speicher zugeführt.A hydraulic control device for a linear actuator is described in DE-A-39 30 553. The control device is designed as a directional control valve block in load-sensing technique. A directional control valve is connected to a lifting cylinder. In a lowering position of the directional control valve, oil flowing back from the cylinder is fed via a loading channel to a pressure compensator in order to fill a reservoir. Depending on the pressure of the returning oil and the pressure prevailing in the memory, the oil flowing back through the pressure compensator either a return or the memory is supplied.

Eine Steuerhydraulik für einen Radlader ist in US-A-5 720 214 beschrieben. In einem ersten Steuerblock sind mehrere Wegeventile, die der Betätigung von Hub- und Kippzylindern der Schaufel dienen, in Form einer Drosselsteuerung verschaltet. Ein weiteres Wegeventil ist dem ersten Steuerblock in Serie nachgeschaltet, um ein zusätzliches Hubwerk zu betätigen.A control hydraulics for a wheel loader is described in US-A-5 720 214. In a first control block, a plurality of directional control valves, which serve to actuate lifting and tilting cylinders of the blade, are connected in the form of a throttle control. Another directional control valve is connected downstream of the first control block in series in order to actuate an additional lifting mechanism.

Mit dem eingangs beschriebenen Wegeventilblock können aber auch Zusatzfunktionen an dem Fahrzeug ausgeführt werden. Beispielweise ist mit dem Wegeventilblock eine Drehzahlbegrenzung bei schneller Entlastung eines Antriebsmotors des Fahrzeuges möglich und/oder eine Federspeicher-Feststellbremse des Fahrzeuges lösbar.With the directional control valve block described above but also additional functions can be performed on the vehicle. For example, with the directional control valve block a speed limitation with rapid relief of a drive motor of the vehicle is possible and / or a spring-loaded parking brake of the vehicle solvable.

Dazu wird bei dem bekannten Wegeventilblock der Steuerdruckanschluss, welcher in Neutralstellung zum Rücklauf entlastet ist, unter Druck gesetzt. Der Druckaufbau wird üblicherweise bei diesem Wegeventilblock durch ein zusätzliches Magnetwegeventil realisiert, welches zum Druckaufbau den Steuerdruckanschluß mit dem Pumpenanschluß P verbindet. Dieses zusätzliche Ventil kann z.B. ein aus der deutschen Publikation Götz. W.: "Hydraulik in Theorie und Praxis", Bosch Schulung, OMEGON Fachliteratur 1997, Seite 268, bekanntes LS-Sonderventil ohne Verbraucheranschlüsse sein, welches in einer vorbestimmten Stellung einen Speicher zum Ausführen von Zusatzfunktionen mit Druckmittel füllt.For this purpose, in the known way valve block, the control pressure port, which is relieved in the neutral position to the return pressurized. The pressure build-up is usually at this directional control valve block by an additional Magnetic valve realized, which connects the pressure in pressure to the control pressure port to the pump port P. This additional valve can eg a from the German publication Götz. W .: "Hydraulics in theory and practice", Bosch training, OMEGON specialist literature 1997, page 268, be known LS special valve without consumer connections, which fills a memory for performing additional functions with pressure medium in a predetermined position.

Auch aus der DE 195 42 371 A1 ist eine Arbeitshydraulik mit einem LS-Wegeventilblock bekannt, welcher einen oder mehrere Verbraucher steuernde Wegeventile und eine mit den Wegeventilen verbundene Anschlußplatte, an die eine Pumpe angeschlossen ist, sowie eine Druckwaage in der Anschlußplatte aufweist, die einerseits mit Pumpendruck beaufschlagt ist und andererseits von einem an den Verbrauchern abgenommenen Signaldruck und einer Reglerfeder beaufschlagt ist. Bei dieser Lösung wirkt die LS-Hydraulik als Fahrzeugbremse. Der Wegeventilblock weist dazu ein zusätzliches 3/2-Magnetwegeventil in der Anschlußplatte auf. Das 3/2-Magnetwegeventil stellt eine Verbindung zwischen dem Steuerdruckanschluß Y und dem Pumpendruckanschluß P zum Druckaufbau her. Auch bei diesem bekannten LS-Wegeventilblock ist somit ein zusätzliches Magnetwegeventil zum Druckaufbau erforderlich.Also known from DE 195 42 371 A1 is a working hydraulics with a LS directional control valve block which has one or more load-controlling directional control valves and a connecting plate connected to the directional control valves, to which a pump is connected, and a pressure compensator in the connection plate, on the one hand is acted upon by pump pressure and on the other hand acted upon by a signal taken to the consumer signal pressure and a regulator spring. In this solution, the LS hydraulic acts as a vehicle brake. The directional control valve block has an additional 3/2-way solenoid valve in the connection plate. The 3/2 solenoid valve establishes a connection between the control pressure port Y and the pump pressure port P for pressure buildup. Also in this known LS-way valve block thus an additional solenoid valve is required to build up pressure.

Bei den bekannten Wegeventilblöcken ergibt sich somit der Nachteil, daß jeweils ein zusätzliches Wegeventil vorgesehen ist, um den erforderlichen Druckaufbau zum Ausführen von Zusatzfunktionen mit der Arbeitshydraulik zu gewährleisten. Dies bedeutet, daß zusätzlicher Bauraum für das weitere Magnetwegeventil bzw. Ventil und die dazugehörigen Verbindungsleitungen in dem Wegeventilblock vorgesehen sein müssen. Dadurch werden bei dem bekannten Wegeventilblock in nachteiliger Weise insbesondere die Herstellungskosten negativ beeinflusst.In the known directional control valve blocks, therefore, there is the disadvantage that in each case an additional directional control valve is provided in order to ensure the required pressure build-up for carrying out additional functions with the working hydraulics. This means that additional space for the further Magnetic way valve or valve and the associated connecting lines must be provided in the directional control valve block. As a result, the production costs are disadvantageously adversely affected in particular in the known directional control valve block.

Es ist die Aufgabe der vorliegenden Erfindung einen Wegeventilblock bzw. eine Arbeitshydraulik anzugeben, bei denen eine Druckerhöhung für das Ausführen von Zusatzfunktionen auf einfache Weise durchführbar ist und die kostengünstig in der Herstellung sind.It is the object of the present invention to provide a directional control valve block or a working hydraulics, in which an increase in pressure for carrying out additional functions in a simple manner can be carried out and which are inexpensive to manufacture.

Diese Aufgabe wird durch einen Wegeventilblockmit den Merkmalen des Patentanspruchs 1 sowie durch eine Arbeitshydraulik mit den Merkmalen des Patentanspruchs 3 gelöst.This object is achieved by a directional control valve block having the features of patent claim 1 and by a working hydraulics having the features of patent claim 3.

Der erfindungsgemäße Wegeventilblock mit den Merkmalen des Patentanspruchs 1 hat den Vorteil, dass ein bereits vorhandenes Wegeventil zum Druckaufbau für Zusatzfunktionen benutzt werden kann, so dass hierfür kein zusätzliches Ventil erforderlich ist. Damit werden nicht nur weniger Leitungen und Bauraum benötigt, sondern die Kosten insgesamt gesenkt.The directional control valve block according to the invention with the features of claim 1 has the advantage that an existing directional control valve can be used to build up pressure for additional functions, so that no additional valve is required for this purpose. This not only requires less piping and installation space, but also reduces overall costs.

Somit kann das Wegeventil einerseits die herkömmlichen Funktionen, d.h. das Versorgen der angeschlossenen Verbraucher ermöglichen, und andererseits in einer des Weiteren vorgesehenen Stellung einen Druckaufbau in einem Speicher ermöglichen, um vorbestimmte Zusatzfunktionen mit der Arbeitshydraulik des Fahrzeuges ausführen zu können.Thus, on the one hand, the directional control valve can perform the conventional functions, i. make it possible to supply the connected consumers, and on the other hand allow in a further provided position pressure buildup in a memory to perform predetermined additional functions with the working hydraulics of the vehicle can.

Mit dem erfindungsgemäßen Wegeventilblock kann vorzugsweise eine Federspeicher-Feststellbremse des Fahrzeuges und/oder eine Drehzahlbegrenzung bei schneller Entlastung des Antriebsmotors des Fahrzeuges oder dergleichen als Zusatzfunktionen ausgeführt werden, ohne daß konstruktive Änderungen an dem erfindungsgemäßen Wegeventilblock vorgenommen werden müssen.With the directional control valve block according to the invention can preferably be a spring-loaded parking brake of the vehicle and / or a speed limitation with rapid relief of the drive motor of the vehicle or the like as additional functions are performed without design changes to the directional control valve block according to the invention must be made.

Das erfindungsgemäß ausgestattete Wegeventil kann in den Wegeventilblock bzw. in die Arbeitshydraulik des Fahrzeuges integriert sein. Selbstverständlich können auch mehrere Wegeventile mit einer derartigen Zwischenstellung, bei der die Verbraucher nicht mit dem Wegeventil verbunden sind, ausgerüstet sein.The directional control valve according to the invention can be integrated in the directional control valve block or in the working hydraulics of the vehicle. Of course, several directional control valves with such an intermediate position, in which the consumers are not connected to the directional control valve, be equipped.

Das Funktionsprinzip des erfindungsgemäßen Wegeventilblocks, bei dem die Druckerzeugung für Zusatzfunktionen ohne zusätzliche Bauteile mit einer Schiebervariante kostengünstig mit Hilfe der Ansteuerelektronik im Wegeventilblock integrierbar ist, ist auf alle elektrisch betätigten LS-Wegeventile übertragbar.The principle of operation of the directional control valve block according to the invention, in which the pressure generation for additional functions without additional components with a slider variant can be integrated inexpensively with the help of the control electronics in directional control valve block, can be applied to all electrically operated LS-way valves.

Weitere Vorteile und vorteilhafte Ausgestaltungen des Gegenstandes der Erfindung sind der Beschreibung, der Zeichnung und den Patentansprüchen entnehmbar.Further advantages and advantageous embodiments of the subject matter of the invention are the description, the drawings and the claims removed.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen

  • Figur 1 ein vereinfachtes Schaltbild eines erfindungsgemäßen Wegeventilblocks;
  • Figur 2 eine Detailansicht eines Wegeventils mit zusätzlicher Zwischenstellung; und
  • Figur 3 eine Steuerfolge des Wegeventils in einem Diagramm, in dem der Pumpendruck und der Volumenstrom über einen Magnetstrom dargestellt sind.
An embodiment of the invention is illustrated in the drawing and explained in more detail in the following description. Show it
  • Figure 1 is a simplified circuit diagram of a directional control valve block according to the invention;
  • Figure 2 is a detail view of a directional control valve with additional intermediate position; and
  • Figure 3 shows a control sequence of the directional control valve in a diagram in which the pump pressure and the flow rate are shown by a magnetic current.

Beschreibung des AusführungsbeispielsDescription of the embodiment

In Figur 1 ist ein vereinfachtes Schaltbild eines erfindungsgemäßen Wegeventilblockes 1 dargestellt, wie er für Anwendungsfälle in der Mobilhydraulik, wo mehrere Funktionen nacheinander oder gleichzeitig über Wegeventile zu steuern sind, eingesetzt wird. In üblicher Weise weist der Wegeventilblock 1 eine Anschlußplatte 2 und eine Endplatte 3 auf, über die der Zulauf und Rücklauf erfolgt. Die Anschlußplatte 2 enthält ein Druckbegrenzungsventil 4 und eine Druckwaage 5, die mit einer an die Anschlußplatte 2 angeschlossenen Pumpe 6 verbunden ist.1 shows a simplified circuit diagram of a directional control valve block 1 according to the invention, as it is for Applications in mobile hydraulics, where several functions are to be controlled one after the other or simultaneously via directional control valves. In the usual way, the directional control valve block 1, a connection plate 2 and an end plate 3, via which the inlet and return takes place. The connection plate 2 includes a pressure limiting valve 4 and a pressure compensator 5, which is connected to a pump 6 connected to the connection plate 2.

Der vorliegende Wegeventilblock 1 stellt einen sogenannten LS(Load Sensing)-Wegeventilblock dar, wobei "Last fühlend" bedeutet, daß der variable Lastdruck in den Verbraucheranschlüssen abgetastet wird und in einer Regelung weiterverarbeitet wird.The present directional control valve block 1 represents a so-called LS (Load Sensing) -way valve block, where "load sensing" means that the variable load pressure is sampled in the load ports and is further processed in a control.

Der Wegeventilblock 1 weist vorliegend zwei Wegeventile 7 und 8 auf, welche parallel zueinander liegen. Zur Trennung der Lastdrücke verschiedener Verbraucher werden diese über Wechselventile 11 ausgewählt, wobei der jeweils höchste Druck der Druckwaage 5 zugeführt wird. Diese Ausgestaltung in der Art eines Drei-Wege-Stromreglers, bietet wesentliche Vorteile für den praktischen Betrieb.The directional control valve block 1 in the present case has two directional control valves 7 and 8 which are parallel to one another. To separate the load pressures of different consumers they are selected via shuttle valves 11, wherein the respective highest pressure of the pressure compensator 5 is supplied. This design, in the form of a three-way current regulator, offers significant advantages for practical operation.

Die Wegeventile 7, 8 haben jeweils Verbraucheranschlüsse A und B, einen Rücklauf R, einen Pumpenanschluß P und einen Steuerdruckanschluß Y. Das Wegeventil 7 weist drei Stellungen auf, wobei eine Neutralstellung mit 0 und die beiden Arbeitsstellungen mit I und II bezeichnet sind.The directional control valves 7, 8 each have consumer ports A and B, a return R, a pump port P and a control pressure port Y. The directional control valve 7 has three positions, wherein a neutral position with 0 and the two working positions with I and II are designated.

Das Wegeventil 8 weist neben den Stellungen 0, I, II eine zusätzliche Zwischenstellung III auf. Bei dieser Zwischenstellung III sind die Verbraucheranschlüsse A, B verschlossen und der Steuerdruckanschluß Y mit dem Pumpendruckanschluß P verbunden. In der Zwischenstellung III kann ein über die Endplatte 3 an den Wegeventilblock 1 angeschlossener Speicher 9 mit Druckmittel über das Wegeventil 8 befüllt werden. Dadurch wird in dem Speicher 9 ein Druck aufgebaut, um mit dem erfindungsgemäßen Wegeventilblock 1 Zusatzfunktionen an dem Fahrzeug ausführen zu können. Der Druckaufbau in dem Speicher 9 erfolgt in Abhängigkeit von einem entsprechenden Signal eines Druckschalters 10, der mit dem Wegeventilblock 1 gekoppelt ist.The directional control valve 8 has, in addition to the positions 0, I, II an additional intermediate position III. In this intermediate position III, the consumer ports A, B are closed and the control pressure port Y connected to the pump pressure port P. In the intermediate position III, a connected via the end plate 3 to the directional control valve block 1 memory 9 can be filled with pressure medium via the directional control valve 8. As a result, pressure is built up in the accumulator 9 in order to be able to carry out additional functions on the vehicle with the directional control valve block 1 according to the invention. The pressure build-up in the memory 9 takes place in dependence on a corresponding signal of a pressure switch 10, which is coupled to the directional control valve block 1.

Figur 2 zeigt einen Ausschnitt des erfindungsgemäßen Wegeventilblocks 1, bei dem das Wegeventil 8 mit der Zwischenstellung III dargestellt ist.Figure 2 shows a section of the directional control valve block 1 according to the invention, in which the directional control valve 8 is shown with the intermediate position III.

In Figur 3 ist ein Diagramm dargestellt, bei dem eine vorbestimmte Steuerfolge 0-I-II des Wegeventils 8 gezeigt ist. Bei dieser Ansteuerung wird zunächst aus der Neutralstellung 0 in die Zwischenstellung III und dann in die Arbeitsstellung I geschaltet. Das Diagramm zeigt den Pumpendruck(Pd)-Volumenstrom(Q)-Verlauf über einen Magnetstrom (I) zum Ansteuern des Proportional-Wegeventils 8. Ein Ansprechstrom I1 zum Druckaufbau in dem Speicher 9 hat einen ausreichenden Abstand zum Beginn einer Arbeitsfunktion I2. In der Zwischenstellung III wird ein maximaler Pumpendruck bzw. Druckbegrenzungsventil(DBV)-Druck PDBV erreicht, welcher in der Arbeitsstellung I auf einen erforderlichen Lastdruck PLast absinkt, sobald ein Ölstrom zu einem Verbraucher fließt.FIG. 3 shows a diagram in which a predetermined control sequence 0-I-II of the directional control valve 8 is shown. In this control is first switched from the neutral position 0 in the intermediate position III and then in the working position I. The diagram shows the pump pressure (P d ) volumetric flow (Q) over a solenoid current (I) for driving the proportional directional control valve 8. A response to pressure build-up I1 in the memory 9 has a sufficient distance to the start of a work function I2. In the intermediate position III, a maximum pump pressure or pressure limiting valve (DBV) pressure P DBV is reached, which decreases in the working position I to a required load pressure P load as soon as an oil flow flows to a consumer.

Wie der Figur 3 zu entnehmen ist, steigt der Volumenstrom Q in der Arbeitsstellung I des Wegeventils 8 kontinuierlich an, bis der Verbraucher mit Öl versorgt ist, und weist dann einen konstanten Verlauf auf.As can be seen from FIG. 3, the volume flow Q in the working position I of the directional control valve 8 increases continuously until the consumer is supplied with oil, and then has a constant course.

Claims (3)

  1. Directional valve block in a demand-feed-regulated embodiment having a plurality of directional valves (7, 8) for controlling at least one hydraulic actuator, and having a device for building up pressure for carrying out additional functions,
    one of the directional valves (8) having an actuator connection (A) for connection to the hydraulic actuator, a pump connection (P), a return connection (R), a control pressure connection (Y) and a valve slide,
    the pump connection (P) being connected to the actuator connection (A), and the load pressure prevailing at the actuator connection (A) being present at the control pressure connection (Y), when the valve slide is in a first position (I) and
    the actuator connection (A) being connected to the return connection (R) when the valve slide is in a second position (II),
    characterized in that
    a third position (III) of the valve slide for building up pressure for carrying out additional functions is provided, in which the actuator connection (A) is blocked and the control pressure connection (Y) is connected to the pump connection (P).
  2. Directional valve block according to Claim 1, characterized in that, in addition, a neutral position (0) of the valve slide is provided, in which the control pressure connection (Y) is relieved of pressure via the return line (R).
  3. Working hydraulics having a directional valve block according to Claim 1 or 2 and an accumulator which is connected to a feed line of the directional valve block.
EP20010124579 2000-12-16 2001-10-09 Directional valve block Expired - Lifetime EP1215397B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10062893 2000-12-16
DE2000162893 DE10062893A1 (en) 2000-12-16 2000-12-16 Way valve block

Publications (3)

Publication Number Publication Date
EP1215397A2 EP1215397A2 (en) 2002-06-19
EP1215397A3 EP1215397A3 (en) 2003-12-10
EP1215397B1 true EP1215397B1 (en) 2006-05-17

Family

ID=7667520

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20010124579 Expired - Lifetime EP1215397B1 (en) 2000-12-16 2001-10-09 Directional valve block

Country Status (2)

Country Link
EP (1) EP1215397B1 (en)
DE (2) DE10062893A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102720710B (en) * 2012-06-26 2015-09-16 中联重科股份有限公司 The controlling method of hydraulic system, hydraulic system and engineering machinery
CN104141650B (en) * 2014-07-29 2016-06-01 浙江海宏液压科技股份有限公司 The forklift multi-way valve of a kind of load-sensitive
CN109083890A (en) * 2018-08-23 2018-12-25 江苏理工学院 A kind of assignment of traffic double valve-regulated load port separate control valves unrelated with load

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3930553A1 (en) * 1989-09-13 1991-03-14 Bosch Gmbh Robert Lifting mechanism hydraulic control system - has pressure-equalisers for flow to and from pressure accumulator
DE19542371A1 (en) * 1995-11-14 1997-05-15 Bosch Gmbh Robert Valve block with passages for fluid
JP3892495B2 (en) * 1996-04-17 2007-03-14 株式会社 神崎高級工機製作所 Hydraulic supply device for work vehicle

Also Published As

Publication number Publication date
EP1215397A2 (en) 2002-06-19
DE10062893A1 (en) 2002-06-20
EP1215397A3 (en) 2003-12-10
DE50109807D1 (en) 2006-06-22

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