EP0751302B1 - Electrohydraulic detent system for a directional valve - Google Patents

Electrohydraulic detent system for a directional valve Download PDF

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Publication number
EP0751302B1
EP0751302B1 EP96100141A EP96100141A EP0751302B1 EP 0751302 B1 EP0751302 B1 EP 0751302B1 EP 96100141 A EP96100141 A EP 96100141A EP 96100141 A EP96100141 A EP 96100141A EP 0751302 B1 EP0751302 B1 EP 0751302B1
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EP
European Patent Office
Prior art keywords
pressure
electrohydraulic
valve
locking
longitudinal slide
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP96100141A
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German (de)
French (fr)
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EP0751302A2 (en
EP0751302A3 (en
Inventor
Wolfgang Dipl.-Ing. Koetter
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP0751302A3 publication Critical patent/EP0751302A3/en
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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

Definitions

  • the invention is based on an electro-hydraulic locking system according to the preamble of the main claim.
  • a hydraulic valve provided with a locking mechanism is known from EP 0 394 860 B1.
  • the valve has a longitudinal slide, on and in one end of which a multiple locking mechanism with radially locking locking balls is arranged.
  • the locking balls sit in radial bores which lie in a cross-sectional plane of the tubular end of the longitudinal slide.
  • the locking recesses are located in the valve housing.
  • a spring-centered locking piston is arranged in the tubular end of the longitudinal slide and can be pressurized with hydraulic oil on the back.
  • the locking piston has a groove for receiving the locking ball.
  • the groove has a phase towards the back. With the help of the wedge effect of the phase, the locking balls can be pressed radially outwards in order to lock them into a housing groove.
  • a latching control valve which can be actuated by an operator and via which the hydraulic oil pressure can be controlled by means of a rotary knob in such a way that either the latching is switched on or off, or the latching is released when the pressure is too high.
  • the latching system according to the invention should have a modular structure be so that it with certain working valve series and their Variants can be combined.
  • the locking system should all Control, switching and sensor elements have one or more Need latching units.
  • the locking system should be like this be constructed so that it is possible - without modifications directly on Working valve - additional boundary conditions for locking individual switch positions.
  • Also supposed to the one or more pressurized locking units have a low pressure medium consumption.
  • the locking system corresponding to the characteristic ones
  • Features of the first claim from several individual elements and / or assemblies, most of which are immediate are arranged on the working valve. These are, for example the individual latching units and the sensor or sensors for Detection of the individual switching positions of the valve spool.
  • the locking elements on a longitudinal slide valve, for example the latching units have a latching contour attached to the longitudinal slide from.
  • the scanning can with respect to the arrangement of the Locking elements or locks, etc. done both radially or axially.
  • the sensors for detecting the individual switch positions of the Longitudinal slides are mechanical, optical, inductive or magnetic Scanning systems. All scanning systems give according to the signals that can be evaluated electrically in each switching position.
  • VDI 2253 An embodiment for a latching unit is shown in VDI 2253 a locking mechanism with double-sided locking direction and changeable Holding force with combined positive and non-positive Blocking.
  • the locking mechanism is, for example, more radial Single ratchet trained.
  • the the locking element or the Locking spring is loaded with the help of a pressure medium piston tensioned.
  • the latching unit has a spring load a low residual holding force due to manual Working valve actuation can be overcome.
  • the characteristics of the further subclaims relate to on the design of the module for detecting the slide position of the working valve and the arrangement and connection of controlling pressure sensors.
  • the locking unit which is pressurized by pressure, needs only as much leverage as is necessary to to clamp the corresponding locking element.
  • a working valve In the middle of the hydraulic circuit diagram according to FIG. 1 is a working valve, a 5/4-way valve (10) shown.
  • the working valve (10) is used here to control a double-acting cylinder (1) used.
  • the valve housing is on the consumer side through the work ports (A, B) and the working lines (3, 4) with the cylinder (1) connected while on the other hand at least a pressure medium line (80) and a return line (81) are connected is.
  • the freewheeling position "F” is arranged.
  • the working lines are via this switch position (3, 4) relieved together in the return line (81).
  • the pressure medium line (80) is blocked at the same time.
  • the 5/4-way valve (10) has a control connection (Y) with a control or signal line (82) connected to it, via the flow positions "1" and “2" the working pressure or in the freewheeling position “F” and the blocking zero position “0" the return pressure can be measured.
  • the longitudinal slide is in its locked zero position "0" Help from the two longitudinal slide end faces Return springs (18) and (19) held or centered.
  • the longitudinal slide has the other switching positions for example a manual actuator (11), such as it is arranged here on the right longitudinal slide face.
  • a manual actuator (11) such as it is arranged here on the right longitudinal slide face.
  • the switching contour (12) is, for example scanned using a roller plunger (61), the actuated an electrical switch (60).
  • the symbolically represented Switching contour (12) here has three switching levels.
  • the middle one Level at which the roller tappet (61) according to FIG. 1 currently is present, corresponds to the blocking zero position. That on the switching contour (12) to the right of the middle level Level is used for electrical detection of the flow position "1", while the highest level is above the Switch (60) recognizes the flow position "2".
  • the second middle level to the left of the highest level, scans the roller plunger (61) in the freewheel position.
  • a notch bar (14) with three notches (15, 16) and (17).
  • the latching unit (40) comprises a housing in which the Locking element (41) is mounted to be longitudinally displaceable.
  • One in Coil spring (42) supporting the housing presses the locking element against the catch bar (14).
  • the actuating device (11) is operated or the longitudinal slide be moved.
  • the notches (15) on the top of the notch bar and (16) act to lock the longitudinal slide in the flow positions "1" and “2” together with the locking unit (30).
  • a spring-loaded locking element (31) engages in the respective notch (15) or (16).
  • This is supported Locking element (31) via a helical spring (32) on a rear piston (33) pressurizable with pressure medium.
  • the piston (33) is located together with the locking element (31) and Coil spring (32) in a comparable to a stepped cylinder Housing (34).
  • the housing is in the area of the piston (33) (34) designed as a pressure medium cylinder (35). It contains the pressure medium space (36).
  • the latter has a larger diameter than the housing (34) in the region of the latching element (31). Thereby can the stroke of the piston (33) to the length of the pressure medium space (36) can be limited.
  • the pressure medium cylinder (35) is via a hydraulic line (88) connected to a 3/2-way valve (50).
  • This auxiliary or connecting valve (50) is actuated by means of an electromagnet (51), which acts against the force of a return spring (52).
  • the pressure medium chamber (36) relieved in lines (87) and (88). At the same time is one pressure medium line (86) leading to the valve (50) is blocked.
  • Pressure sensor (67) arranged for the maximum pressure medium pressure.
  • a pressure reducing valve (63) is integrated in the branching pressure medium line (86). It limits the control pressure to approx. 20 x 10 5 N / m 2 .
  • the latching individually for each of the two flow positions with, for example, manually operated switches (71) and (72) can be selected.
  • each switch (71) or (72) a changeover switch (73) or (74) arranged in series, with which a maximum pressure-dependent unlatching is activated can be.
  • This is in the respective line section for the maximum pressure-dependent unlatching a maximum pressure switch with switching delay (75) or (76) installed.
  • Both Maximum pressure switches are here controlled by a pressure and time Actuator (69) actuated.
  • the maximum pressure-dependent unlatching enables one, for example an unintended load-side pressure increase an unlock the latching unit (30). With the help of the delayed The maximum pressure switches (75) and (76) can be activated accidental unlocking due to short, high pressure peaks avoid.
  • the 5/4-way valve (10) in a continuous position stands and actuates at least one latching switch (71, 72) is, the electromagnetic actuator (51) of the 3/2-way valve (50) energized.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Preventing Unauthorised Actuation Of Valves (AREA)
  • Fluid-Driven Valves (AREA)

Description

Stand der TechnikState of the art

Die Erfindung geht von einem elektrohydraulischen Verrastungssystem nach dem Oberbegriff des Hauptanspruchs aus.The invention is based on an electro-hydraulic locking system according to the preamble of the main claim.

Aus der EP 0 394 860 B1 ist ein mit einem Rastmechanismus versehenes Hydraulikventil bekannt. Das Ventil hat einen Längsschieber, an und in dessen einem Ende ein Mehrfachgesperre mit radial sperrenden Rastkugeln angeordnet ist. Die Rastkugeln sitzen in radialen Bohrungen, die in einer Querschnittsebene des rohrförmigen Endes des Längsschiebers liegen. Die Rastausnehmungen befinden sich im Ventilgehäuse. Im rohrförmigen Ende des Längsschiebers ist ein federzentrierter Rastkolben angeordnet, der rückseitig mit Hydrauliköl druckbeaufschlagt werden kann. An seiner Vorderseite hat der Rastkolben eine Nut zur Aufnahme der Rastkugel. Die Nut hat zur Rückseite hin eine Phase. Mit Hilfe der Keilwirkung der Phase können die Rastkugeln radial nach außen gedrückt werden, um sie sperrend in eine Gehäusenut zu zwängen.
Im Ventilgehäuse ist ferner ein von einer Bedienungsperson betätigbares Raststeuerventil angeordnet, über das sich der Hydrauliköldruck mittels eines Drehknopfes derart steuern läßt, daß entweder die Verrastung ein- oder ausgeschaltet ist, oder sich die Verrastung bei einem zu hohen Druck löst. A hydraulic valve provided with a locking mechanism is known from EP 0 394 860 B1. The valve has a longitudinal slide, on and in one end of which a multiple locking mechanism with radially locking locking balls is arranged. The locking balls sit in radial bores which lie in a cross-sectional plane of the tubular end of the longitudinal slide. The locking recesses are located in the valve housing. A spring-centered locking piston is arranged in the tubular end of the longitudinal slide and can be pressurized with hydraulic oil on the back. At its front, the locking piston has a groove for receiving the locking ball. The groove has a phase towards the back. With the help of the wedge effect of the phase, the locking balls can be pressed radially outwards in order to lock them into a housing groove.
Also arranged in the valve housing is a latching control valve which can be actuated by an operator and via which the hydraulic oil pressure can be controlled by means of a rotary knob in such a way that either the latching is switched on or off, or the latching is released when the pressure is too high.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Verrastungssystem soll modular aufgebaut sein, so daß es mit bestimmten Arbeitsventilbaureihen und deren Varianten kombinierbar ist. Dazu soll das Verrastungssystem alle Steuer-, Schalt- und Sensorelemente aufweisen, die ein oder mehrere Verrastungseinheiten benötigen. Des weiteren sollen zumindest für alle zu verrastenden Durchflußstellungen des Arbeitsventils verschiedene Verrastungsbedingungen wählbar sein, wobei der Verrastungszustand auch bei Betrieb des Arbeitsventils geändert werden kann. Nicht zuletzt soll das Verrastungssystem so konstruiert sein, daß es möglich ist - ohne Umbauten direkt am Arbeitsventil - zusätzliche Randbedingungen für das Verrasten einzelner Schaltstellungen berücksichtigen zu können. Auch sollen das oder die druckmittelbeaufschlagten Verrastungseinheiten einen geringen Druckmittelverbrauch aufweisen.The latching system according to the invention should have a modular structure be so that it with certain working valve series and their Variants can be combined. To do this, the locking system should all Control, switching and sensor elements have one or more Need latching units. Furthermore, at least for all flow positions of the working valve to be locked different latching conditions can be selected, whereby the latching state also changed when the work valve was in operation can be. Last but not least, the locking system should be like this be constructed so that it is possible - without modifications directly on Working valve - additional boundary conditions for locking individual switch positions. Also supposed to the one or more pressurized locking units have a low pressure medium consumption.

Hierzu besteht das Verrastungssystem, entsprechend den kennzeichnenden Merkmalen des ersten Patentanspruchs, aus mehreren einzelnen Elementen und/oder Baugruppen, die großteils unmittelbar am Arbeitsventil angeordnet sind. Das sind beispielsweise die einzelnen Verrastungseinheiten und der oder die Sensoren zum Erkennen der einzelnen Schaltstellungen des Ventilschiebers. Dabei tasten z.B bei einem Längsschieberventil die Rastelemente der Verrastungseinheiten eine am Längsschieber angebrachte Rastenkontur ab. Die Abtastung kann bezüglich der Anordnung der Rastelemente bzw. Sperrer u.a. sowohl radial oder axial erfolgen. Ferner ist pro Schaltstellung mindestens ein Rastelement vorgesehen.For this there is the locking system, corresponding to the characteristic ones Features of the first claim, from several individual elements and / or assemblies, most of which are immediate are arranged on the working valve. These are, for example the individual latching units and the sensor or sensors for Detection of the individual switching positions of the valve spool. there feel the locking elements on a longitudinal slide valve, for example the latching units have a latching contour attached to the longitudinal slide from. The scanning can with respect to the arrangement of the Locking elements or locks, etc. done both radially or axially. Furthermore, there is at least one locking element per switching position intended.

Die Sensoren zum Erfassen der einzelnen Schaltstellungen des Längsschiebers sind mechanische, optische, induktive oder magnetische Abtastsysteme. Alle Abtastsysteme geben entsprechend der jeweiligen Schaltstellung elektrisch auswertbare Signale ab. The sensors for detecting the individual switch positions of the Longitudinal slides are mechanical, optical, inductive or magnetic Scanning systems. All scanning systems give according to the signals that can be evaluated electrically in each switching position.

Diese Signale werden zusammen mit den Signalen von elektrischen Bedienelementen in Form von Schaltern und ggf. Drucksensoren benutzt, um mindestens ein Hilfsventil zur Druckmittelbelastung einer Verrastungseinheit elektrisch zu steuern.These signals are combined with the signals from electrical Control elements in the form of switches and possibly pressure sensors used, by at least one auxiliary valve for pressure medium loading to control a latching unit electrically.

Ein Ausführungsbeispiel für eine Verrastungseinheit ist nach VDI 2253 ein Rastgesperre mit zweiseitiger Sperrichtung und veränderbarer Haltekraft bei kombinierter form- und kraftschlüssiger Sperrung. Das Rastgesperre ist dabei beispielsweise als radialer Einfachsperrer ausgebildet. Die das Rastelement bzw. den Sperrer belastende Rastfeder ist mit Hilfe eines Druckmittelkolbens spannbar. Bei reiner Federbelastung weist die Verrastungseinheit eine geringe Resthaltekraft auf, die durch eine manuelle Arbeitsventilbetätigung überwunden werden kann.An embodiment for a latching unit is shown in VDI 2253 a locking mechanism with double-sided locking direction and changeable Holding force with combined positive and non-positive Blocking. The locking mechanism is, for example, more radial Single ratchet trained. The the locking element or the Locking spring is loaded with the help of a pressure medium piston tensioned. The latching unit has a spring load a low residual holding force due to manual Working valve actuation can be overcome.

Die Merkmale der weiteren Unteransprüche beziehen sich u.a. auf die Ausgestaltung der Baugruppe zur Erkennung der Schieberstellung des Arbeitsventils und die Anordnung und Verschaltung von steuernden Drucksensoren.The characteristics of the further subclaims relate to on the design of the module for detecting the slide position of the working valve and the arrangement and connection of controlling pressure sensors.

Mit dem hier beschriebenen Verrastungssystem wird es ermöglicht, im Bereich der Ventile mit Verrastungen eine Funktionentrennung zu realisieren. Die hydraulische oder pneumatische Funktion des Arbeitsventils ist klar getrennt von der erwünschten Verrastungsfunktion für bestimmte Schaltstellungen des Ventilschiebers. Dazu sind die einzelnen Bauteile und Elemente des Verrastungssystems selbständige Funktionseinheiten, die untereinander primär elektrisch verschaltet sind und problemlos an die dafür vorgesehenen Arbeitsventile angebracht werden können. Dadurch wird es möglich die verschiedensten Arbeitsventile mit Verrastungen zu versehen. Zusätzlich können durch die elektrische Verschaltung die Schalter oder Bedienelemente für das Rasten und Entrasten für jede gewünschte Schaltstellung an beliebigen Orten angebracht werden. Auch eine Anzeige der Verrastungszustände und ggf. der Druckwerte ist räumlich nicht an das Arbeitsventil gebunden. Außerdem können zur Steuerung der Verrastungseinheiten weitere externe Schalter vorgesehen werden.With the locking system described here it is possible to Separation of functions in the area of the valves with catches to realize. The hydraulic or pneumatic function of the The working valve is clearly separated from the desired locking function for certain switching positions of the valve spool. For this purpose, the individual components and elements of the locking system independent functional units that work with each other are primarily electrically connected and can easily be connected to them provided work valves can be attached. Thereby it becomes possible to use a wide variety of working valves Latches. In addition, the electrical Interconnection of the switches or controls for snapping and unlatching for any desired switch position at any Places. Also a display of the latching states and possibly the pressure values is not spatially related to that Working valve bound. You can also use it to control the locking units additional external switches are provided.

Des weiteren braucht die druckmitteldruckbeaufschlagte Verrastungseinheit nur so viel Druckmittel, wie notwendig ist, um das entsprechende Rastelement zu spannen.Furthermore, the locking unit, which is pressurized by pressure, needs only as much leverage as is necessary to to clamp the corresponding locking element.

Zeichnungendrawings

Ein Ausführungsbeispiel der Erfindung ist in den Zeichnungen schematisch in Form von zwei Prinzipschaltbildern dargestellt und in der nachfolgenden Figurenbeschreibung erläutert. Es zeigen

Figur 1
einen Hydraulikschaltplan mit einem an einem Arbeitsventil angeordneten Verrastungssystem und
Figur 2
einen Elektroschaltplan zu dem in Figur 1 dargestellten Hydraulikschaltplan mit den zur Betätigung des Verrastungssystems notwendigen Sensoren und Schaltern.
An embodiment of the invention is shown schematically in the drawings in the form of two block diagrams and explained in the following description of the figures. Show it
Figure 1
a hydraulic circuit diagram with a locking system arranged on a working valve and
Figure 2
an electrical circuit diagram to the hydraulic circuit diagram shown in Figure 1 with the sensors and switches necessary to actuate the locking system.

Beschreibung der AusführungsbeispieleDescription of the embodiments

In der Mitte des Hydraulikschaltplans nach Figur 1 ist ein Arbeitsventil, ein 5/4-Wegeventil (10) dargestellt. Das Arbeitsventil (10) wird hier zur Steuerung eines doppeltwirkenden Zylinders (1) verwendet. Dazu hat es einen Längsschieber, der in seinem Ventilgehäuse vier Schaltstellungen erlaubt. Das Ventilgehäuse ist auf der Verbraucherseite über die Arbeitsanschlüsse (A, B) und die Arbeitsleitungen (3, 4) mit dem Zylinder (1) verbunden, während es auf der anderen Seite zumindest an eine Druckmittelleitung (80) und eine Rücklaufleitung (81) angeschlossen ist. In the middle of the hydraulic circuit diagram according to FIG. 1 is a working valve, a 5/4-way valve (10) shown. The working valve (10) is used here to control a double-acting cylinder (1) used. For this it has a longitudinal slide, which in its valve body allows four switching positions. The valve housing is on the consumer side through the work ports (A, B) and the working lines (3, 4) with the cylinder (1) connected while on the other hand at least a pressure medium line (80) and a return line (81) are connected is.

In der in Figur 1 dargestellten Schaltstellung "0", einer Sperr-Nullstellung, sind die Arbeitsleitungen (3, 4) gesperrt. Beidseitig neben der Schaltstellung "0" sind die Symbole für die Durchflußstellungen "1" und "2" gezeigt. Bei diesen Schaltstellungen werden ein Druckmittelanschluß (P) und ein Rücklaufanschluß (R) mit den Arbeitsanschlüssen (A) und (B) bzw. (B) und (A) verbunden. Dadurch wird die Kolbenstange (2) des Zylinders (1) ein- bzw. ausgefahren.In the switch position "0" shown in FIG. 1, a blocking zero position, the working lines (3, 4) are blocked. both sides next to the switch position "0" are the symbols for the Flow positions "1" and "2" shown. With these switch positions become a pressure medium connection (P) and a return connection (R) with the working connections (A) and (B) or (B) and (A) connected. This will remove the piston rod (2) from the cylinder (1) retracted or extended.

Neben der Schaltstellung "2" ist die Freilaufstellung "F" angeordnet. Über diese Schaltstellung werden die Arbeitsleitungen (3, 4) gemeinsam in die Rücklaufleitung (81) entlastet. Die Druckmittelleitung (80) wird gleichzeitig gesperrt.In addition to the switching position "2", the freewheeling position "F" is arranged. The working lines are via this switch position (3, 4) relieved together in the return line (81). The pressure medium line (80) is blocked at the same time.

Zusätzlich hat das 5/4-Wegeventil (10) einen Steueranschluß (Y) mit einer daran angeschlossenen Steuer- oder Signalleitung (82), über die beispielsweise in den Durchflußstellungen "1" und "2" der Arbeitsdruck oder in der Freilaufstellung "F" und der Sperr-Nullstellung "0" der Rücklaufdruck gemessen werden kann.In addition, the 5/4-way valve (10) has a control connection (Y) with a control or signal line (82) connected to it, via the flow positions "1" and "2" the working pressure or in the freewheeling position "F" and the blocking zero position "0" the return pressure can be measured.

Der Längsschieber wird in seiner Sperr-Nullstellung "0" mit Hilfe von an den beiden Längsschieberstirnseiten anliegenden Rückstellfedern (18) und (19) gehalten bzw. zentriert. Zur Ansteuerung der anderen Schaltstellungen hat der Längsschieber beispielsweise eine manuelle Betätigungseinrichtung (11), wie sie hier an der rechten Längsschieberstirnseite angeordnet ist. Im Bereich der Betätigungsvorrichtung ist am Längsschieber eine Schaltkontur (12) angebracht. Die Schaltkontur (12) wird beispielsweise mit Hilfe eines Rollenstößels (61) abgetastet, der einen elektrischen Schalter (60) betätigt. Die symbolisch dargestellte Schaltkontur (12) hat hier drei Schaltniveaus. Das mittlere Niveau, auf dem der Rollenstößel (61) nach Figur 1 momentan anliegt, entspricht der Sperr-Nullstellung. Das auf der Schaltkontur (12) rechts neben dem mittleren Niveau tiefer angeordnete Niveau dient der elektrischen Erkennung der Durchflußstellung "1", während das am höchsten liegende Niveau über den Schalter (60) die Durchflußstellung "2" erkennt.The longitudinal slide is in its locked zero position "0" Help from the two longitudinal slide end faces Return springs (18) and (19) held or centered. For control the longitudinal slide has the other switching positions for example a manual actuator (11), such as it is arranged here on the right longitudinal slide face. In the area of the actuating device there is a on the longitudinal slide Switch contour (12) attached. The switching contour (12) is, for example scanned using a roller plunger (61), the actuated an electrical switch (60). The symbolically represented Switching contour (12) here has three switching levels. The middle one Level at which the roller tappet (61) according to FIG. 1 currently is present, corresponds to the blocking zero position. That on the switching contour (12) to the right of the middle level Level is used for electrical detection of the flow position "1", while the highest level is above the Switch (60) recognizes the flow position "2".

Das zweite mittlere Niveau, links neben dem höchsten Niveau, tastet der Rollenstößel (61) in der Freilaufstellung ab.The second middle level, to the left of the highest level, scans the roller plunger (61) in the freewheel position.

Im Ausführungsbeispiel befindet sich am anderen Ende des Längsschiebers eine Rastenleiste (14) mit drei Rastkerben (15, 16) und (17). Im Bereich der Rastenleiste sind zwei Verrastungseinheiten (30) und (40) angeordnet.In the exemplary embodiment is located at the other end of the longitudinal slide a notch bar (14) with three notches (15, 16) and (17). There are two latching units in the area of the catch bar (30) and (40) arranged.

In die untere Rastkerbe (17) greift in der Freilaufstellung "F" ein federbelastetes Rastelement (41) der Verrastungseinheit (40) ein. Die Verrastungseinheit (40) umfaßt ein Gehäuse, in dem das Rastelement (41) längsverschieblich gelagert ist. Eine sich im Gehäuse abstützende Schraubenfeder (42) drückt das Rastelement gegen die Rastenleiste (14). Zur Lösung dieser Verrastung muß hier die Betätigungseinrichtung (11) bedient bzw. der Längsschieber verschoben werden.In the freewheel position "F", the lower notch (17) engages a spring-loaded locking element (41) of the locking unit (40) on. The latching unit (40) comprises a housing in which the Locking element (41) is mounted to be longitudinally displaceable. One in Coil spring (42) supporting the housing presses the locking element against the catch bar (14). To solve this locking must here the actuating device (11) is operated or the longitudinal slide be moved.

Die auf der Oberseite der Rastenleiste liegenden Rastkerben (15) und (16) wirken zur Verrastung des Längsschiebers in den Durchflußstellungen "1" und "2" mit der Verrastungseinheit (30) zusammen. Hier greift ein federbelastetes Rastelement (31) in die jeweilige Rastkerbe (15) oder (16) ein. Dabei stützt sich das Rastelement (31) über eine Schraubenfeder (32) an einem rückseitig mit Druckmittel beaufschlagbaren Kolben (33) ab. Der Kolben (33) befindet sich zusammen mit dem Rastelement (31) und der Schraubenfeder (32) in einem mit einem Stufenzylinder vergleichbaren Gehäuse (34). Im Bereich des Kolbens (33) ist das Gehäuse (34) als Druckmittelzylinder (35) ausgebildet. Er enthält den Druckmittelraum (36). Letzterer hat einen größeren Durchmesser als das Gehäuse (34) im Bereich des Rastelements (31). Dadurch kann der Hub des Kolbens (33) auf die Länge des Druckmittelraums (36) begrenzt werden. The notches (15) on the top of the notch bar and (16) act to lock the longitudinal slide in the flow positions "1" and "2" together with the locking unit (30). Here a spring-loaded locking element (31) engages in the respective notch (15) or (16). This is supported Locking element (31) via a helical spring (32) on a rear piston (33) pressurizable with pressure medium. The piston (33) is located together with the locking element (31) and Coil spring (32) in a comparable to a stepped cylinder Housing (34). The housing is in the area of the piston (33) (34) designed as a pressure medium cylinder (35). It contains the pressure medium space (36). The latter has a larger diameter than the housing (34) in the region of the latching element (31). Thereby can the stroke of the piston (33) to the length of the pressure medium space (36) can be limited.

Der Druckmittelzylinder (35) ist über eine Hydraulikleitung (88) an ein 3/2-Wegeventil (50) angeschlossen. Dieses Hilfs- bzw. Zuschaltventil (50) wird mittels eines Elektromagneten (51) betätigt, der gegen die Kraft einer Rückstellfeder (52) wirkt. In der durch die Wirkung der Rückstellfeder (52) bedingten Ruhestellung bzw. Entlastungsstellung ist der Druckmittelraum (36) in die Leitungen (87) und (88) entlastet. Gleichzeitig ist eine zum Ventil (50) führende Druckmittelleitung (86) gesperrt.The pressure medium cylinder (35) is via a hydraulic line (88) connected to a 3/2-way valve (50). This auxiliary or connecting valve (50) is actuated by means of an electromagnet (51), which acts against the force of a return spring (52). In the rest position caused by the action of the return spring (52) the pressure medium chamber (36) relieved in lines (87) and (88). At the same time is one pressure medium line (86) leading to the valve (50) is blocked.

Bei einer elektrischen Betätigung des 3/2-Wegeventils (50) bewegt sich dieses in Durchflußstellung, wodurch in der Verrastungseinheit (30) der Kolben (33) die Schraubenfeder (32) spannt. Dabei wird die Rücklaufleitung (88) gesperrt.Moves when the 3/2-way valve (50) is actuated electrically this in the flow position, whereby in the locking unit (30) the piston (33) the coil spring (32) stressed. The return line (88) is blocked.

In dem in Figur 1 und 2 gezeigten Ausführungsbeispiel sind für die Betätigung des 3/2-Wegeventils (50) mehrere Randbedingungen zu erfüllen. So muß zum einen der Längsschieber des 5/4-Wegeventils (10) im Bereich einer der beiden Durchflußstellung "1" oder "2" stehen und der Druckmitteldruck über einem Minimaldruck sowie ggf. unter einem Maximaldruck liegen. Der minimale Druckmitteldruck wird mit Hilfe eines Drucksensors (66) gemessen, der in der Druckmittelleitung (80) vor der Abzweigung zur Druckmittelleitung (86) liegt. Der Drucksensor (67) trägt zusammen mit einem von ihm über ein Stellglied (68) gesteuerten Schalter (77) zur Erhöhung der Systemsicherheit bei, indem er ein Verrasten nur ermöglicht, wenn die Druckmittelpumpe eingeschaltet ist. Das Stellglied (68) und der Schalter (77) ist in Figur 2 zwischen dem elektromagnetischen Betätigungselement (51) und dem Schalter (60) angeordnet.In the embodiment shown in Figures 1 and 2 are for the actuation of the 3/2-way valve (50) several boundary conditions to fulfill. For example, the longitudinal slide of the 5/4-way valve must (10) in the area of one of the two flow positions "1" or "2" stand and the pressure medium pressure above a minimum pressure as well possibly below a maximum pressure. The minimum fluid pressure is measured with the aid of a pressure sensor (66) which is in the pressure medium line (80) before the branch to the pressure medium line (86) lies. The pressure sensor (67) carries together with one switch (77) controlled by him via an actuator (68) to increase system security by locking only possible if the pressure medium pump is switched on. The Actuator (68) and switch (77) is between in Figure 2 the electromagnetic actuator (51) and the switch (60) arranged.

Nach der Abzweigung ist in der Druckmittelleitung (80) ein weiterer Drucksensor (67) für dem maximalen Druckmitteldruck angeordnet.After the junction there is another one in the pressure medium line (80) Pressure sensor (67) arranged for the maximum pressure medium pressure.

Zusätzlich ist in der abzweigenden Druckmittelleitung (86) ein Druckminderventil (63) integriert. Er begrenzt den Steuerdruck auf ca. 20 x 105 N/m2.In addition, a pressure reducing valve (63) is integrated in the branching pressure medium line (86). It limits the control pressure to approx. 20 x 10 5 N / m 2 .

Zum anderen muß, wie aus dem Prinzipschaltbild in Figur 2 hervorgeht, die Verrastung einzeln für jede der beiden Durchflußstellungen mit beispielsweise handbetätigten Schaltern (71) und (72) vorgewählt werden. Gleichzeitig ist jedem Schalter (71) bzw. (72) ein Wechselschalter (73) bzw. (74) in Reihe nachgeordnet, mit denen eine maximaldruckabhängige Entrastung zugeschaltet werden kann. Dazu ist im jeweiligen Leitungsabschnitt für die maximaldruckabhängige Entrastung ein Maximaldruckschalter mit Schaltverzögerung (75) bzw. (76) eingebaut. Beide Maximaldruckschalter werden hier durch ein druck- und zeitgesteuertes Stellglied (69) betätigt.On the other hand, as can be seen from the basic circuit diagram in Figure 2, the latching individually for each of the two flow positions with, for example, manually operated switches (71) and (72) can be selected. At the same time, each switch (71) or (72) a changeover switch (73) or (74) arranged in series, with which a maximum pressure-dependent unlatching is activated can be. This is in the respective line section for the maximum pressure-dependent unlatching a maximum pressure switch with switching delay (75) or (76) installed. Both Maximum pressure switches are here controlled by a pressure and time Actuator (69) actuated.

Die maximaldruckabhängige Entrastung ermöglicht bei einer beispielsweise unbeabsichtigten lastseitigen Druckerhöhung ein Entsperren der Verrastungseinheit (30). Mit Hilfe des zeitverzögerten Ansprechens der Maximaldruckschalter (75) und (76) läßt sich ein versehentliches Entrasten durch kurzzeitige, hohe Druckspitzen vermeiden.The maximum pressure-dependent unlatching enables one, for example an unintended load-side pressure increase an unlock the latching unit (30). With the help of the delayed The maximum pressure switches (75) and (76) can be activated accidental unlocking due to short, high pressure peaks avoid.

Sofern nun der Druckmitteldruck zwischen den vorgegebenen Grenzwerten liegt, das 5/4-Wegeventil (10) in einer Durchlaufstellung steht und mindestens ein Verrastungsschalter (71, 72) betätigt ist, wird das elektromagnetische Betätigungselement (51) des 3/2-Wegeventils (50) bestromt.Provided that the fluid pressure is between the specified limit values lies, the 5/4-way valve (10) in a continuous position stands and actuates at least one latching switch (71, 72) is, the electromagnetic actuator (51) of the 3/2-way valve (50) energized.

Claims (8)

  1. Electrohydraulic interlock system for an at least mechanically actuated working valve (10) having a longitudinal slide assuming at least two switching positions (1, 2) in a valve housing, with at least one interlock unit (30, 40) having a spring-loaded and pressure-medium-loaded locking element for blocking in these switching positions by engagement into at least one locking notch (15, 16), a locking spring (32) which loads the locking element being arranged so as to be capable of being tensioned by means of a piston (33) movable in a pressure-medium cylinder (35),
    characterized
    in that the pressure-medium cylinder (35) is preceded by an electrically actuable valve (50) for cutting in the pressure medium,
    in that at least one subassembly (11, 12, 60, 61) for the electrically evaluatable detection of at least one switching position of the longitudinal slide is arranged on the valve housing, and
    in that, for the interlocking of the longitudinal slide in the respective switching position, there is in each case at least one electrical switching element (71-74),
    at least the switching position of the longitudinal slide and the switch position of the switching elements (71-74) controlling the cut-in of the valve (50), and
    all the parts which relate to the interlock system being arranged as modularly constructed subassemblies demountably on the working valve (10) or in the vicinity of the latter.
  2. Electrohydraulic interlock system according to Claim 1, characterized in that at least one interlock unit (30; 40) is a locking mechanism (15-17; 31; 41) with a two-sided blocking direction and variable holding force, along with combined positive and non-positive blocking.
  3. Electrohydraulic interlock system according to Claim 1 or 2, characterized in that the spring-loaded and pressure-medium-loaded interlock unit (30) has a low residual holding force in the case of straightforward spring loading.
  4. Electrohydraulic interlock system according to Claim 1, characterized in that the subassembly (60, 61) for the electrically evaluatable detection of at least one switching position of the longitudinal slide senses mechanically a switching contour (12) arranged on the longitudinal slide or integrated in the longitudinal-slide contour.
  5. Electrohydraulic interlock system according to Claim 1, characterized in that in a pressure-medium line (80) leading to the working valve (10) are arranged a minimum-pressure sensor (66) and a maximum-pressure sensor (67) which prevent or interrupt the application of current for the electrical actuation of the valve (50) in the event that a predetermined pressure-medium range is undershot or exceeded.
  6. Electrohydraulic interlock system according to Claim 5, characterized in that at least the maximum-pressure sensor (67) is followed by an additionally time-controlled actuator (69).
  7. Electrohydraulic interlock system according to Claim 1, characterized in that a further spring-loaded interlock unit (40) is arranged in the region of the longitudinal slide.
  8. Electrohydraulic interlock system according to Claim 1, characterized in that the holding force of the interlock unit (40) is capable of being set by means of a mechanical tensioning of the locking spring (42).
EP96100141A 1995-06-28 1996-01-08 Electrohydraulic detent system for a directional valve Expired - Lifetime EP0751302B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19523456A DE19523456A1 (en) 1995-06-28 1995-06-28 Electro-hydraulic locking system for a directional valve
DE19523456 1995-06-28

Publications (3)

Publication Number Publication Date
EP0751302A2 EP0751302A2 (en) 1997-01-02
EP0751302A3 EP0751302A3 (en) 1999-04-28
EP0751302B1 true EP0751302B1 (en) 2003-04-09

Family

ID=7765439

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96100141A Expired - Lifetime EP0751302B1 (en) 1995-06-28 1996-01-08 Electrohydraulic detent system for a directional valve

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EP (1) EP0751302B1 (en)
DE (2) DE19523456A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2669557A2 (en) 2012-05-29 2013-12-04 Robert Bosch Gmbh Latching device for a spool valve
DE102016202304A1 (en) 2016-02-16 2017-08-17 Robert Bosch Gmbh Directional control valve with electromagnetically actuated detent

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19858482A1 (en) * 1998-12-18 2000-06-29 Mannesmann Rexroth Ag Hydraulic directional seat valve has fixed locking unit engaging on flat locking cam along a line, to reduce wear on cam
US8109356B2 (en) 2007-09-24 2012-02-07 Clark Equipment Company Auxiliary hydraulic flow control system for a small loader
CN108167511A (en) * 2018-02-12 2018-06-15 无锡智能自控工程股份有限公司 Remote centralized operation hydraulic manual mechanism
CN108980233A (en) * 2018-09-20 2018-12-11 岭南师范学院 A kind of electrichydraulic control formula machinery wheel body lockable mechanism

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Publication number Priority date Publication date Assignee Title
US4195551A (en) * 1977-06-23 1980-04-01 Gresen Manufacturing Company Hydraulic control valve including electromagnetic detent
DE3125482A1 (en) * 1981-06-29 1983-01-13 Günter Till Präzisionsmechanik, 3330 Helmstedt Control valve
DE3801072C1 (en) * 1988-01-15 1989-06-15 Mannesmann Rexroth Gmbh, 8770 Lohr, De

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2669557A2 (en) 2012-05-29 2013-12-04 Robert Bosch Gmbh Latching device for a spool valve
DE102012208943A1 (en) 2012-05-29 2013-12-05 Robert Bosch Gmbh Detent device for a slide valve
US9328844B2 (en) 2012-05-29 2016-05-03 Robert Bosch Gmbh Detent mechanism for a sliding valve
DE102016202304A1 (en) 2016-02-16 2017-08-17 Robert Bosch Gmbh Directional control valve with electromagnetically actuated detent

Also Published As

Publication number Publication date
EP0751302A2 (en) 1997-01-02
DE19523456A1 (en) 1997-01-02
DE59610323D1 (en) 2003-05-15
EP0751302A3 (en) 1999-04-28

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