EP2550461B1 - Device for locking an axially movable component of a hydraulic system - Google Patents
Device for locking an axially movable component of a hydraulic system Download PDFInfo
- Publication number
- EP2550461B1 EP2550461B1 EP11708718.9A EP11708718A EP2550461B1 EP 2550461 B1 EP2550461 B1 EP 2550461B1 EP 11708718 A EP11708718 A EP 11708718A EP 2550461 B1 EP2550461 B1 EP 2550461B1
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- EP
- European Patent Office
- Prior art keywords
- switching
- pressure
- piston
- clamping
- switching device
- 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.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
- F15B13/0426—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with fluid-operated pilot valves, i.e. multiple stage valves
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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
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/26—Locking mechanisms
- F15B15/261—Locking mechanisms using positive interengagement, e.g. balls and grooves, for locking in the end positions
Definitions
- the invention relates to a device for locking an axially displaceable component of a hydraulic system, wherein the axially displaceable component in at least one axial position via a detent with a detent body releasably releasably fixed, and with a notching device for notching the detent body from the axially displaceable component, wherein the detent means of a tensioning piston and using an energy accumulator is latched and released, and wherein the tensioning piston is movable in a loadable by a clamping pressure working space.
- the DE 39 23 743 A1 discloses a hydraulic directional control valve with a locking device which holds the spool in a working position.
- the locking device has a Ausklink adopted for the spool of the directional control valve, so that at a possible overpressure or even at a corresponding low pressure of the spool can be returned to its neutral center position.
- the locking device has for this purpose an overpressure responsive pressure valve with a piston member and a piston with a spring accumulator, which responds to low pressure. Both the piston and the piston member are operatively connected to a cone, which relieves locking balls located in the locking position, so that the spool can be moved to its neutral center position.
- the EP 1 446 599 B1 again shows a device for locking an axially displaceable component, such as a spool of a hydraulic directional control valve, by means of which the axially movable member in axial positions via a detent is durable.
- the detent is releasable by means of a notching device for notching detent bodies from the axially displaceable component.
- the locking positions that allow the detent variably adjustable by changing a position of a Codier stresses. It can thus represent a mechanical coding that allows multiple functional configurations of the directional control valve and thus allows the same various operating conditions.
- Out DE 41 07 980 A1 is a generic hydraulically actuated locking device for a longitudinally movable part relative to a stationary part by means of a radially movable ball known.
- the ball is arranged in a transverse bore of a stationary, sleeve-shaped part and is able to penetrate into the detent position in a latching groove on the movable part, in unlocked position in a groove on a radially outer sliding sleeve.
- the latching device further comprises a pressure medium connection from a pressure medium source to a pressure chamber delimited by the movable part, wherein a part of the pressure medium connection is formed in the movable part itself.
- the longitudinally movable member is typically a piston which is mechanically locked after a certain sliding travel by the latching means. In this position, the sliding sleeve abuts with its end face at the tube end and the compression spring is fully biased. If the piston is to be extended, pressure medium is introduced into the pressure chamber via a bore under a correspondingly high pressure. About this pressure medium, a pressure builds up, which shifts the sliding sleeve against the force of the compression spring, so that the annular groove can reach into the region of the ball and the piston is unlocked again.
- a disadvantage of the device could be considered that always takes place on reaching a certain working pressure, the unlatching of the spool.
- a permanent detenting or a deactivated detenting and an operation performed with such a configuration of the component or a directional control valve is not possible.
- the present invention seeks to provide a device for locking an axially displaceable component of a hydraulic system, in particular for locking a spool, which does not have the disadvantages mentioned.
- a particularly advantageous feature of the device characterizing the invention is that the tensioning piston can be adjusted by a switching device at least into a switching position.
- the switching device ensures on the one hand, that the clamping pressure is guided to the clamping piston and can be wegvul again by the energy storage from its latching position at drop of the clamping pressure in this first, called “kick-out switching position" switching position of the clamping piston.
- at least two further switching positions can preferably be realized with the switching device, wherein a further second switching position serves to discharge pressure medium from the clamping piston in a pressure medium container, so that the spool can return to a neutral position.
- a third switching position of the switching device preferably provides for a blocking of the tensioning piston in the respective assumed switching position, in particular in the latching position.
- the component may be a spool of a hydraulic directional control valve.
- the switching device is acted upon as a clamping pressure of a load pressure of a consumer, which is preferably controlled by the directional control valve. This results in that no latching function is possible in a working position of a hydraulic working tool when a pressure medium pump is connected. In a restart of the pressure medium pump is thus reliably prevented that the spool of the directional control valve is in a position in which a working connection is directly connected to the pressure medium-promoting pressure medium pump and thus a dangerous, unintentional actuation of a consumer is possible (safety function).
- a so-called "kick-out" function of the switching device should cancel the locking action when reaching a predetermined load height at the working port of the directional control valve and push the valve slide out of the detent position with the aid of the energy accumulator (kick-out).
- the switching device can be operated preferably manually and thereby preferably three switching positions or operating modes for the detent can be realized. Since the switching device controls the pressurization of the clamping piston for the detent, a permanent release of the clamping piston can be effected with a second switching position of a valve member of the switching device by the working space is connected to a pressure fluid container for emptying the working space and a connection of the working space of the clamping piston with a Load pressure of a consumer is omitted. This results in a permanent inoperative position of the detent.
- a blocking of the supply and removal of pressure medium to or from the working space of the tensioning piston can be effected. This results in a blocking position of the clamping piston.
- the choice of the various switching positions can be done via a rotary switch or switch button, all three switching positions of the valve member of the switching device at half a turn of the switch knob or less are approached.
- the valve member of the switching device can perform a combined Drehund translational movement, as this is very space-saving about with a control piston feasible.
- the "kick-out" function is realized, in which the clamping piston for the detent is subjected to a clamping pressure. Left and right of this neutral position can be provided the two other switching positions.
- this is integrated in a housing of the directional control valve and a longitudinal axis of the control piston is arranged parallel to a longitudinal axis of the valve member of the directional control valve.
- the inventive device is particularly suitable for an arrangement in hydraulic systems of commercial vehicles, such as so-called. Tractors.
- Fig.1 is a schematic diagram of a device 1 to a directional control valve 3 for locking a valve member 18 of the directional control valve 3 shown.
- the valve member 18 is formed as a valve spool and as an axially displaceable component 2 in a conventional manner.
- the pertinent directional control valve 3 a pressure supply port P for providing a working and pump pressure, a return port R, a section load sensing port LS, two control ports P ' A and P' B and two Nutzan say E, F on.
- the said fluid connections LS, P ' A , P' B , R, E, F are arranged in a part of a housing 14 of the directional control valve 3.
- a lower portion of the housing 14 has an annular channel assembly 19, in which a pressure compensator 11 is inserted, which is connected upstream of the directional control valve 3 and this provides the function of a Quiltnabschneidung through the LS-pressure limitation.
- This can be at a drive a designed as a hydraulic cylinder load 10, which is shown only schematically and should be located at an end stop, to cut off the overload of the pressure medium pump, the flow rate of pressure medium to the hydraulic cylinder.
- the device 1 for locking the valve member 18 to the housing 14 of the directional control valve 3 is affiliated.
- the device 1 consists of one, like the Figure 2 ' shows detent 4 with a movable in the same axial direction as the valve member 18 locking piston 20, in the extension of an element 21 is arranged in the manner of a cone bush, the control or inclined surfaces 22 has.
- the device 1 is arranged in a single housing 29, wherein the housing 29 has a rectangular, formed with rounded corners, massive flange plate 30 with which it can be screwed to a flat end face of the housing 14 of the directional control valve 3 from the left side is.
- Fig. 7 illustrates in a perspective view that the housing 29 is formed in the manner of a cup with a substantially conically widening to the housing 14 shape, wherein in the housing 29, a cylindrical bore 31 is introduced.
- the bore 31 has an approximately twice as large diameter D as the diameter of the locking piston 20, which extends through the bore 31 substantially in its entire length.
- the locking piston 20 is formed as a cylindrical rotary member integral with the valve member 18 of the directional control valve 3 and has a diameter reduction of about 1 ⁇ 4 of the diameter of the valve member 18 in the axial region of the flange plate 30, wherein the diameter in the axial region of the housing 29 with the exception of two locking recesses 24,25 forming grooves 32 is designed to be consistent.
- the grooves 32 have a part-circular cross-section.
- the locking piston 20 is mounted at its free end 33 in a guide bushing 34 and lies with its slightly less than half its length reaching collar on the wall formed by the bore 31.
- the locking piston 20 can penetrate the guide bushing 34 by its free end 33 can engage in a blind hole at the top of the housing 29 depending on its displacement position.
- the grooves 32 are located in the in the Figure 3 and 4 shown displacement position of the locking piston 20 in the region of the respective end faces 36,36 'of the guide bush 34th
- latching body 5 can occur in the form of balls.
- latching body 5 can occur in the form of balls.
- the inclined surfaces 22 extend approximately 45 ° to a longitudinal axis 17 of the valve member 18 to the guide bush 34, so that the locking body 5 or balls are held in contact with the inclined surfaces 22 on an end face 36 of the guide bush 34.
- the stop sleeve 35 is acted upon by a cylindrical compression spring 37, which is guided at a radial distance on the locking piston 20, and is supported on the stop sleeve 35 at an end formed by an extension of the inner diameter of the stop sleeve 35 face 38 axially.
- the compression spring 37 is guided on an inner circumferential surface 39 of the stop sleeve 35.
- the stop sleeve 35 has an inner contour in the manner of a piston.
- the compression spring 37 is held in contact with a tensioning piston 7.
- the clamping piston 7 is arranged axially displaceably in a blind bore 40, which is guided by a stop surface 41 for the flange plate 30.
- the blind bore 40 has a slightly larger diameter Ds, so that the clamping piston guided therein 7 can reach with its bore 31 facing end face 42 into abutment against the flange plate 30.
- the compression spring 37 is located in a recess 43 in the clamping piston 7 and is radially guided in this respect.
- a cylindrical helical compression spring 44 which is a force accumulator 8, arranged, and applies a compressive force on one of the inclined or control surfaces 22 radially outwardly adjacent end face 45 of the stop sleeve 35 , The pressure force is so far directed against the pressure force of the compression spring 37.
- a working space 27 between a bottom of the blind bore 40 and the back of the clamping piston 7 can be acted upon with a clamping pressure p, in all in the Fig. 1 to 7 shown embodiments, a load pressure P 'of the pressure compensator 11 is.
- the load pressure p ' is via an in the channel 14 of the directional control valve 3 guided channel 46 is tapped, wherein the channel 46 has only the dimension of a control pressure line.
- the channel 46 adjoins an end face 47 of a valve member 12 formed as a control piston 15 of a switching device 9.
- the control piston 15 is aligned with its longitudinal axis 16 parallel to the longitudinal axis 17 of the valve member 18 and has on the one hand, as Figure 3 in a longitudinal section, a through hole 48, which is guided axially by the control piston 15.
- the through hole 48 is guided off-center. Further, on the outer periphery of the control piston 15 of the through hole 48 opposite a wrench-like milled recess 49 is disposed on the outer periphery of the control piston 15.
- the control piston 15 is with its end face 47 into abutment with a blunt needle tip 50 of a bearing needle 51 which is inserted in the housing 14 of the directional control valve 3 in the direction of the longitudinal axis 16 of the control piston 15.
- the control piston 15 is slidably guided substantially in a blind bore 52 which is parallel to the blind bore 40 for the clamping piston 7.
- the blind bore 52 is guided by the same stop surface 41 of the housing 14 of the directional control valve 3 as the blind bore 40 itself.
- the diameter of the valve member 12 is reduced, wherein a cylindrical compression spring 28 is pushed, which is supported at its end remote from the control piston 15 on a shaft 53 of a switch knob 13.
- the shaft 53 is guided in the housing 29 and has at its end facing the compression spring 28 the same outer diameter as the switching piston 15.
- the diameter of the shaft 53 tapers in a first diameter recess 54 within the housing 29 to the switch knob 13 and again when exiting the housing 29.
- the shaft 53 extends through the switch knob 13 and is in this with a splined connection 55 (tongue and groove) partly guided.
- the switch knob 13 is also fixed with a cap nut 56 fixed on a thread of the shaft 53.
- the switching knob 13 is, as in particular the Figure 7 shows, designed as a double-wing knob that is manually operable.
- a spring chamber 57 for the compression spring 37 and a spring chamber 58 for the compression spring 28 are connected to a pressure medium tank T in the form of a tank connection (see. Figure 7 ) connected.
- a pertinent channel 59 extends in the direction of the 2 'to 5 seen in the housing 14 of the directional control valve 3 in a direction parallel to the longitudinal axes 16,17 and above the valve member 18.
- the channel 59 is diagonal, the flange plate 30 and an adjoining housing portion of the housing 29 arranged transversely and terminates in the spring chamber 57. As the Figure 7 shows, this channel 59 opens at its other end to a milled side surface 60 of the valve housing 29.
- the clamping piston 7, a position as in the Figure 4 shown occupy and in connection with a corresponding operational switching position of the valve member 18 at a pressurization of a hydraulic load 10 can lead to a latching by incidence of the locking body 5 in one of the two detent recesses 24 and 25.
- the locking piston 20 and the integrally formed therewith valve member 18 are releasably secured to the stop sleeve 35.
- the detent body 5 formed as balls abut against the inclined or control surfaces 22 of the stop sleeve 35, which in turn is pressed by the tensioning piston 7 caused by the increased spring bias of the compression spring 37 against the guide bushing 34.
- the locking piston 20 at reduced spring force of the compression spring 37 and in the direction of the Fig. 2 'and 5 shown positions of the receding clamping piston 7 due to the power storage 8, the helical compression spring 44 and by the valve spring, not shown (other valve spool end) in one, the locking body 5 from the respective detent recess 24,25 releasing and throwing out position (kick-out).
- all functions of the switching device 9 can be put out of operation (cf. Fig. 5 ).
- the switching knob 13 is then in a position offset by approximately 90 °.
- the clamping piston working chamber 27 is then set via the transverse channel 61 and the milled recess 49 to pass to the lower pressure medium tank connection T. This can, for example, in a steady lifting-lowering work with a consumer 10, which is designed as a hydraulic cylinder, be helpful because the valve member switching positions can change constantly.
- a third switching position of the switching device 9 see.
- Figure 3 can be set a Treasureverrastung the locking piston 20 by a voltage applied in the clamping piston working chamber 27 clamping pressure p 'is cut off by the pressure compensator 11 after a latching has occurred. This allows a continuous operation of hydraulic motors are made possible.
- the housing 29 can be unscrewed in a simple manner from the housing 14 of the directional control valve 3 (not shown).
- a flat gasket 62 can serve as the simplest sealing element for sealing said fluid-carrying connections and spring chambers between the two housings 14 and 29.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Preventing Unauthorised Actuation Of Valves (AREA)
- Fluid-Pressure Circuits (AREA)
- Actuator (AREA)
- Mechanical Control Devices (AREA)
Description
Die Erfindung betrifft eine Vorrichtung zum Verriegeln eines axial verschiebbaren Bauteils einer hydraulischen Anlage, wobei das axial verschiebbare Bauteil in zumindest einer axialen Position über eine Rastierung mit einem Rastkörper formschlüssig lösbar festlegbar ist, und mit einer Ausklinkeinrichtung zum Ausklinken des Rastkörpers aus dem axial verschiebbaren Bauteil, wobei die Rastierung mittels eines Spannkolbens und unter Einsatz eines Kraftspeichers verrastbar und lösbar ist, und wobei der Spannkolben in einem mit einem Spanndruck beaufschlagbaren Arbeitsraum verfahrbar ist.The invention relates to a device for locking an axially displaceable component of a hydraulic system, wherein the axially displaceable component in at least one axial position via a detent with a detent body releasably releasably fixed, and with a notching device for notching the detent body from the axially displaceable component, wherein the detent means of a tensioning piston and using an energy accumulator is latched and released, and wherein the tensioning piston is movable in a loadable by a clamping pressure working space.
In hydraulischen Anlagen übernehmen Wegeventile mit unterschiedlicher Anzahl an Steueranschlüssen und Schaltpositionen verschiedenste Ansteueraufgaben für Stellglieder, wie Hydrozylinder und dergleichen, um beispielsweise angeschlossene Arbeitswerkzeuge jedweder Art betätigen zu können. Solche Wegeventile bedürfen insbesondere, wenn für eine Bedienperson einer derartigen hydraulischen Anlage, wie sie etwa bei Nutzfahrzeugen zum Einsatz kommt, Gefahren verursacht werden könnten, einer nach Abschalten der hydraulischen Anlage notwendigen Rückführung in eine Neutralposition. So kann vermieden werden, dass bei einer Wiederinbetriebnahme der hydraulischen Anlage es zu einer unbeabsichtigten Stellbewegung bei Arbeitswerkzeugen oder zu einem ungewollten Anlauf von anderen hydraulischen Verbrauchern der Anlage kommt. Insbesondere auch bei einem ungewollten Abfall des Druckmitteldruckes in der hydraulischen Anlage bedarf es einer derartigen, automatischen Sicherheitseinrichtung, um dadurch verursachte Stellbewegungen oder inverse Drehrichtungen anders als die, die eigentlich gewünscht sind, von hydraulischen Stellgliedern oder Motoren auszuschließen.In hydraulic systems take over directional control valves with different numbers of control connections and switching positions a variety of control tasks for actuators, such as hydraulic cylinders and the like to operate, for example, connected work tools of any kind. Such directional valves require in particular, if for an operator of such a hydraulic system, such as those used in commercial vehicles, hazards could be caused, necessary after switching off the hydraulic system return to a neutral position. So it can be avoided that when restarting the hydraulic system it is an unintentional Adjustment movement comes at work tools or to an unwanted startup of other hydraulic consumers of the plant. In particular, even with an unwanted drop in pressure medium pressure in the hydraulic system, it requires such an automatic safety device to thereby cause actuation movements or inverse directions other than those that are actually desired to exclude hydraulic actuators or motors.
Die
Die
Aus
Als nachteilig an der Vorrichtung könnte man ansehen, dass stets bei Erreichen eines bestimmten Arbeitsdruckes die Entrastung des Steuerschiebers erfolgt. Eine dauerhafte Rastierung oder eine abgeschaltete Rastierung und ein mit solch einer Konfiguration des Bauteils bzw. eines Wegeventils durchgeführter Betrieb ist hingegen nicht möglich.A disadvantage of the device could be considered that always takes place on reaching a certain working pressure, the unlatching of the spool. On the other hand, a permanent detenting or a deactivated detenting and an operation performed with such a configuration of the component or a directional control valve is not possible.
Ausgehend von diesem Stand der Technik liegt der Erfindung die Aufgabe zugrunde, eine Vorrichtung zum Verriegeln eines axial verschiebbaren Bauteils einer hydraulischen Anlage, insbesondere zur Verriegelung eines Steuerschiebers, zu schaffen, die die genannten Nachteile nicht aufweist.Based on this prior art, the present invention seeks to provide a device for locking an axially displaceable component of a hydraulic system, in particular for locking a spool, which does not have the disadvantages mentioned.
Diese Aufgabe wird mit einer Vorrichtung zum Verriegeln eines axial verschiebbaren Bauteils mit den Merkmalen des Patentanspruches 1 in seiner Gesamtheit gelöst.This object is achieved with a device for locking an axially displaceable component with the features of
Ein besonders vorteilhaftes, die Erfindung charakterisierendes Merkmal der Vorrichtung ist, dass der Spannkolben zumindest in eine Schaltposition von einer Schalteinrichtung einstellbar ist. Die Schalteinrichtung sorgt zum einen dafür, dass der Spanndruck an den Spannkolben geführt wird und bei Abfall des Spanndruckes in dieser ersten, als "kick-out-Schaltposition" genannten Schaltstellung der Spannkolben auch wieder durch den Kraftspeicher aus seiner rastenden Position wegverfahren werden kann. Zum anderen können bevorzugterweise mit der Schalteinrichtung zumindest zwei weitere Schaltpositionen realisiert werden, wobei eine weitere zweite Schaltposition dazu dient, Druckmittel von dem Spannkolben in einen Druckmittelbehälter abzuführen, so dass der Steuerschieber in eine neutrale Position rückkehren kann. Eine dritte Schaltposition der Schalteinrichtung sieht vorzugsweise eine Sperrung des Spannkolbens in der jeweiligen eingenommenen Schaltposition, insbesondere in der Rastposition, vor.A particularly advantageous feature of the device characterizing the invention is that the tensioning piston can be adjusted by a switching device at least into a switching position. The switching device ensures on the one hand, that the clamping pressure is guided to the clamping piston and can be wegverfahren again by the energy storage from its latching position at drop of the clamping pressure in this first, called "kick-out switching position" switching position of the clamping piston. On the other hand, at least two further switching positions can preferably be realized with the switching device, wherein a further second switching position serves to discharge pressure medium from the clamping piston in a pressure medium container, so that the spool can return to a neutral position. A third switching position of the switching device preferably provides for a blocking of the tensioning piston in the respective assumed switching position, in particular in the latching position.
Das Bauteil kann ein Steuerschieber eines hydraulischen Wegeventils sein. In einem besonders bevorzugten Ausführungsbeispiel ist vorgesehen, dass die Schalteinrichtung als Spanndruck von einem Lastdruck eines Verbrauchers, der vorzugsweise von dem Wegeventil gesteuert ist, beaufschlagt wird. Dadurch ergibt sich, dass bei einer angeschalteten Druckmittelpumpe keine Rastfunktion in einer Arbeitsstellung eines hydraulischen Arbeitswerkzeuges möglich ist. Bei einem Wiederanlauf der Druckmittelpumpe ist somit sicher verhindert, dass der Steuerschieber des Wegeventils in einer Position ist, in der ein Arbeitsanschluß direkt mit der Druckmittel fördernden Druckmittelpumpe verbunden wird und somit ein gefährliches, unbeabsichtigtes Betätigen eines Verbrauchers möglich ist (Sicherheitsfunktion). Eine sog. "kick-out"-Funktion der Schalteinrichtung soll bei Erreichen einer vorbestimmten Lasthöhe am Arbeitsanschluß des Wegeventils die Rastwirkung aufheben und mit Hilfe des Kraftspeichers den Ventilschieber aus der Raststellung herausstoßen (kick-out).The component may be a spool of a hydraulic directional control valve. In a particularly preferred embodiment, it is provided that the switching device is acted upon as a clamping pressure of a load pressure of a consumer, which is preferably controlled by the directional control valve. This results in that no latching function is possible in a working position of a hydraulic working tool when a pressure medium pump is connected. In a restart of the pressure medium pump is thus reliably prevented that the spool of the directional control valve is in a position in which a working connection is directly connected to the pressure medium-promoting pressure medium pump and thus a dangerous, unintentional actuation of a consumer is possible (safety function). A so-called "kick-out" function of the switching device should cancel the locking action when reaching a predetermined load height at the working port of the directional control valve and push the valve slide out of the detent position with the aid of the energy accumulator (kick-out).
Die Schalteinrichtung läßt sich bevorzugt manuell betätigen und dabei lassen sich vorzugsweise drei Schaltpositionen oder Betriebsmodi für die Rastierung verwirklichen. Da die Schalteinrichtung die Druckbeaufschlagung des Spannkolbens für die Rastierung steuert, kann mit einer zweiten Schaltposition eines Ventilgliedes der Schalteinrichtung eine dauerhafte Entlastung des Spannkolbens bewirkt werden, indem dessen Arbeitsraum mit einem Druckmittelbehälter zur Entleerung des Arbeitsraumes verbunden wird und eine Verbindung des Arbeitsraumes des Spannkolbens mit einem Lastdruck eines Verbrauchers unterbleibt. Es ergibt sich dadurch eine dauerhafte Außerbetriebstellung der Rastierung.The switching device can be operated preferably manually and thereby preferably three switching positions or operating modes for the detent can be realized. Since the switching device controls the pressurization of the clamping piston for the detent, a permanent release of the clamping piston can be effected with a second switching position of a valve member of the switching device by the working space is connected to a pressure fluid container for emptying the working space and a connection of the working space of the clamping piston with a Load pressure of a consumer is omitted. This results in a permanent inoperative position of the detent.
In einer dritten Schaltposition der Schalteinrichtung kann ein Sperren der Zu- und Abfuhr von Druckmittel zu bzw. von dem Arbeitsraum des Spannkolbens bewirkt werden. Es ergibt sich hieraus eine Sperrstellung des Spannkolbens. Die Wahl der verschiedenen Schaltpositionen kann über einen Drehschalter oder Schaltknopf erfolgen, wobei alle drei Schaltpositionen des Ventilgliedes der Schalteinrichtung bei einer halben Umdrehung des Schaltknopfes oder weniger anfahrbar sind.In a third switching position of the switching device, a blocking of the supply and removal of pressure medium to or from the working space of the tensioning piston can be effected. This results in a blocking position of the clamping piston. The choice of the various switching positions can be done via a rotary switch or switch button, all three switching positions of the valve member of the switching device at half a turn of the switch knob or less are approached.
Das Ventilglied der Schalteinrichtung kann dabei eine kombinierte Drehund Translationsbewegung ausführen, wie dies sehr platzsparend etwa mit einem Steuerkolben realisierbar ist.The valve member of the switching device can perform a combined Drehund translational movement, as this is very space-saving about with a control piston feasible.
In einer Neutralposition oder mittigen Position ist die "kick-out"-Funktion verwirklicht, in der der Spannkolben für die Rastierung mit einem Spanndruck beaufschlagt ist. Links und rechts von dieser Neutralposition können die zwei weiteren Schaltpositionen vorgesehen sein. In einer besonders Bauraum sparenden Ausführungsform der Vorrichtung ist diese in einem Gehäuse des Wegeventils integriert und eine Längsachse des Schaltkolbens ist parallel zu einer Längsachse des Ventilgliedes des Wegeventils angeordnet.In a neutral position or central position, the "kick-out" function is realized, in which the clamping piston for the detent is subjected to a clamping pressure. Left and right of this neutral position can be provided the two other switching positions. In a particularly space-saving embodiment of the device this is integrated in a housing of the directional control valve and a longitudinal axis of the control piston is arranged parallel to a longitudinal axis of the valve member of the directional control valve.
Die erfindungsgemäße Vorrichtung eignet sich besonders für eine Anordnung in hydraulischen Anlagen von Nutzfahrzeugen, wie beispielsweise sog. Ackerschleppern.The inventive device is particularly suitable for an arrangement in hydraulic systems of commercial vehicles, such as so-called. Tractors.
Im Folgenden wird die erfindungsgemäße Vorrichtung anhand eines Ausführungsbeispiels nach der Zeichnung näher beschrieben. Dabei zeigen die
- Fig.1
- einen schematischen Schaltplan einer Vorrichtung zum Verriegeln eines axial verschiebbaren Bauteils einer hydraulischen Anlage;
- Fig.2
- einen schematischen, nicht maßstäblichen Längsschnitt durch ein hydraulisches Wegeventil zum Anschließen der Vorrichtung zum Verriegeln gemäß den
Fig. 2' bis 7 ; - Fig. 2'
- einen schematischen, nicht maßstäblichen Längsschnitt durch die Vorrichtung zum Verriegeln des axial verschiebbaren Bauteils in einer Grundstellung;
- Fig.3
- einen schematischen, nicht maßstäblichen Längsschnitt durch die Vorrichtung zum Verriegeln des axial verschiebbaren Bauteils in einer Dauerraststellung (Schaltstellung DR/Drehwinkel -90°);
- Fig.4
- einen schematischen, nicht maßstäblichen Längsschnitt durch die Vorrichtung zum Verriegeln des axial verschiebbaren Bauteils in einer "kick-out"-Funktionsstellung (Schaltstellung K.O./
Drehwinkel 0°); - Fig.5
- einen schematischen, nicht maßstäblichen Längsschnitt durch die Vorrichtung zum Verriegeln des axial verschiebbaren Bauteils in einer Außerbetriebstellung einer Schalteinrichtung (ohne Raste /o.R. Drehwinkel +90°);
- Fig.6
- eine Frontansicht der Vorrichtung zum Verriegeln des axial verschiebbaren Bauteils mit der Schalteinrichtung; und
- Fig.7
- eine schematische, perspektivische Ansicht der Vorrichtung zum Verriegeln des axial verschiebbaren Bauteils an einem Wegeventil gemäß der Darstellung nach der
Fig.2 .
- Fig.1
- a schematic circuit diagram of a device for locking an axially displaceable component of a hydraulic system;
- Fig.2
- a schematic, not to scale longitudinal section through a hydraulic directional valve for connecting the device for locking according to the
Fig. 2 'to 7 ; - Fig. 2 '
- a schematic, not to scale longitudinal section through the device for locking the axially displaceable component in a basic position;
- Figure 3
- a schematic, not to scale longitudinal section through the device for locking the axially displaceable component in a permanent locked position (switching position DR / rotation angle -90 °);
- Figure 4
- a schematic, not to scale longitudinal section through the device for locking the axially displaceable component in a "kick-out" function position (switch position KO /
rotation angle 0 °); - Figure 5
- a schematic, not to scale longitudinal section through the device for locking the axially displaceable component in a non-operating position of a switching device (without detent / oR rotation angle + 90 °);
- Figure 6
- a front view of the device for locking the axially displaceable member with the switching device; and
- Figure 7
- a schematic, perspective view of the device for locking the axially displaceable component to a directional control valve as shown in the
Fig.2 ,
In der
Wie die
Für einen funktionsfähigen Aufbau der Gesamtvorrichtung ist in Blickrichtung auf die
Wie die
Der Rastkolben 20 ist als zylindrisches Drehteil einstückig mit dem Ventilglied 18 des Wegeventils 3 ausgebildet und weist eine Durchmesserverkleinerung von etwa ¼ des Durchmessers des Ventilglieds 18 im Axialbereich der Flanschplatte 30 auf, wobei der Durchmesser im Axialbereich des Gehäuses 29 mit Ausnahme zweier Rastmulden 24,25 bildenden Eindrehungen 32 gleichbleibend ausgestaltet ist. Die Eindrehungen 32 haben teilkreisförmigen Querschnitt. Der Rastkolben 20 ist an seinem freien Ende 33 in einer Führungsbuchse 34 gelagert und liegt mit ihrem etwas weniger über ihre halbe Länge reichenden Bund an der durch die Bohrung 31 gebildeten Wand an. Der Rastkolben 20 kann die Führungsbuchse 34 durchragen, indem er mit seinem freien Ende 33 in ein Sackloch an der Spitze des Gehäuses 29 je nach seiner Verfahrstellung eingreifen kann. Die Eindrehungen 32 befinden sich in der in den
In die Eindrehungen 32 können Rastkörper 5 in Form von Kugeln einfallen. In den in den
Die Druckfeder 37 liegt in einer Eindrehung 43 in dem Spannkolben 7 und ist insoweit radial geführt. In einem Ringraum zwischen dem Außenumfang der Führungsbuchse 34 und der Bohrung 31 ist eine zylindrische Schraubendruckfeder 44, die einen Kraftspeicher 8 darstellt, angeordnet, und bringt eine Druckkraft auf eine an die Schräg- oder Steuerflächen 22 radial nach außen angrenzende Stirnfläche 45 der Anschlaghülse 35 auf. Die Druckkraft ist insoweit entgegen der Druckkraft der Druckfeder 37 gerichtet.The
Ein Arbeitsraum 27 zwischen einem Boden der Sackbohrung 40 und der Rückseite des Spannkolbens 7 ist mit einem Spanndruck p beaufschlagbar, der in allen in den
Die Durchgangsbohrung 48 ist außermittig geführt. Ferner ist an dem Außenumfang des Steuerkolbens 15 der Durchgangsbohrung 48 gegenüberliegend eine schlüsselweitenartige Einfräsung 49 an dem Außenumfang des Steuerkolbens 15 angeordnet. Der Steuerkolben 15 ist mit seiner Stirnfläche 47 in Anschlag mit einer stumpfen Nadelspitze 50 einer Lagernadel 51, die in dem Gehäuse 14 des Wegeventils 3 in Richtung der Längsachse 16 des Steuerkolbens 15 eingesetzt ist. Der Steuerkolben 15 ist im wesentlichen in einer Sackbohrung 52, die parallel zu der Sackbohrung 40 für den Spannkolben 7 ist, gleitend geführt. Die Sackbohrung 52 ist durch dieselbe Anschlagfläche 41 des Gehäuses 14 des Wegeventils 3 geführt wie die Sackbohrung 40 selbst.The through
Auf seiner der Stirnfläche 47 gegenüberliegenden Seite ist der Durchmesser des Ventilgliedes 12 verringert, wobei eine zylindrische Druckfeder 28 aufgeschoben ist, die sich an ihrem dem Steuerkolben 15 abgewandten Ende an einer Welle 53 eines Schaltknopfes 13 abstützt. Die Welle 53 ist in dem Gehäuse 29 geführt und weist an ihrem der Druckfeder 28 zugewandten Ende denselben Außendurchmesser wie der Schaltkolben 15 auf. Der Durchmesser der Welle 53 verjüngt sich in einem ersten Durchmesserrücksprung 54 innerhalb des Gehäuses 29 zu dem Schaltknopf 13 hin und wiederum beim Austritt aus dem Gehäuse 29. Die Welle 53 durchragt den Schaltknopf 13 und ist in diesem mit einer Keilwellenverbindung 55 (Nut-Feder) teilweise geführt. Der Schaltknopf 13 ist mit einer Hutmutter 56, die auf einem Gewinde der Welle 53 festgelegt ist, gleichfalls festgelegt. Der Schaltknopf 13 ist, wie dies insbesondere die
Ein Federraum 57 für die Druckfeder 37 und ein Federraum 58 für die Druckfeder 28 sind mit einem Druckmittelbehälter T in Form eines Tankanschlusses (vgl.
In dem in den
Wie die
Bei entsprechender Druckbeaufschlagung des Arbeitsraumes 27 kann der Spannkolben 7 eine Position wie in der
Wird bei einer Betriebsunterbrechung oder Abschaltung der hydraulischen Anlage der LS-Druck und damit auch der Druck p' in dem Arbeitsraum 27 des Spannkolbens 7 abgesenkt oder gegen Null gebracht, so kann der Rastkolben 20 bei verringerter Federkraft der Druckfeder 37 und bei in Richtung der in den
In einer weiteren Schaltposition können alle Funktionen der Schalteinrichtung 9 außer Betrieb gesetzt sein (vgl. hierzu
Zu Wartungs- und Montagezwecken der Schalteinrichtung 9 kann das Gehäuse 29 in einfacher Weise von dem Gehäuse 14 des Wegeventils 3 abgeschraubt werden (nicht dargestellt). Eine Flachdichtung 62 kann als einfachstes Dichtelement zur Abdichtung der genannten fluidführenden Verbindungen und Federräume zwischen den beiden Gehäusen 14 und 29 dienen. For maintenance and mounting purposes of the
Claims (13)
- A device for locking an axially moveable component (2) of a hydraulic system, the axially moveable component (2) being able to be secured releaseably in a positively locking manner in at least one axial position by means of a detent mechanism (4) with at least one detent body (5), and with a release device (6) for releasing the respective detent body (5) from the axially moveable component (2), the detent mechanism (4) being able to be latched and released by means of a clamping piston (7) and with the use of an energy storage mechanism (8), and the clamping piston (7) being able to be moved within a working chamber (27) which can be subjected to a clamping pressure, characterised in that the clamping piston (7) can be adjusted at least into one switching position by a switching device (9), that clamping pressure can be applied to the clamping piston (7) by means of the switching device (9), and in this switching position can be moved out of its latching position by means of the energy storage mechanism (8) when there is a drop in the clamping pressure.
- The device according to Claim 1, characterised in that in an additional second switching position of the switching device (9) hydraulic fluid from the clamping piston (7) can be discharged from the working chamber (27) into a hydraulic fluid container (T) so that the component (2) can return into its neutral position.
- The device according to Claim 1 or 2, characterised in that in a third switching position of the switching device (9) the clamping piston (7) can be locked in the respectively occupied switching position, in particular in the latching position.
- The device according to any of the preceding claims, characterised in that the component (2) is a control slide of a hydraulic directional control valve (3).
- The device according to any of the preceding claims, characterised in that a load pressure (p') of a consumer (10), which can preferably be controlled by the directional control valve (3), is applied as clamping pressure to the switching device (9).
- The device according to any of Claims 2 to 5, characterised in that the switching device (9) can be brought manually into at least two, preferably three switching positions (A, B, C).
- The device according to any of the preceding claims, characterised in that when the detent mechanism (4) is in a latching position, the switching device (9) applies to the clamping piston (7) a hydraulic fluid pressure which corresponds to the initial pressure (p') of a pressure compensator (11).
- The device according to any of Claims 2 to 7, characterised in that the switching device (9) has a valve member (12) that has at least two, preferably three switching positions (A, B, C) which can be produced by a rotational and translational movement.
- The device according to Claim 8, characterised in that the switching device (9) has a control knob (13) which can be rotated by approximately 180° and with which the at least two switching positions (A, B, C) of the valve member (12) of the switching device (9) can be preset.
- The device according to Claim 9, characterised in that the switching device (9) has a neutral position of its rotatable control knob (13) with which clamping pressure is applied to the clamping piston (7).
- The device according to any of Claims 4 to 10, characterised in that the switching device (9) is integrated into a housing (14) of the hydraulic directional control valve (3) and the clamping pressure in the housing (14) is guided from the directional control valve (3) to the switching device (9).
- The device according to any of Claims 4 to 11, characterised in that the switching device (9) has a valve member (12) which is formed as a control piston (15) and the longitudinal axis (16) of which runs parallel to a longitudinal axis (17) of a valve member (18) of the hydraulic directional control valve (3).
- The device according to any of the preceding claims, characterised in that the load pressure (p') is separated from a pressure chamber (6) of the clamping piston (7) by means of a throttle point.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL11708718T PL2550461T3 (en) | 2010-03-20 | 2011-03-05 | Device for locking an axially movable component of a hydraulic system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102010012158A DE102010012158A1 (en) | 2010-03-20 | 2010-03-20 | Device for locking an axially displaceable component of a hydraulic system |
PCT/EP2011/001092 WO2011116877A1 (en) | 2010-03-20 | 2011-03-05 | Device for locking an axially movable component of a hydraulic system |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2550461A1 EP2550461A1 (en) | 2013-01-30 |
EP2550461B1 true EP2550461B1 (en) | 2015-01-07 |
Family
ID=44169130
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11708718.9A Not-in-force EP2550461B1 (en) | 2010-03-20 | 2011-03-05 | Device for locking an axially movable component of a hydraulic system |
Country Status (6)
Country | Link |
---|---|
US (1) | US20120304850A1 (en) |
EP (1) | EP2550461B1 (en) |
JP (1) | JP2013522739A (en) |
DE (1) | DE102010012158A1 (en) |
PL (1) | PL2550461T3 (en) |
WO (1) | WO2011116877A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106809008B (en) * | 2017-02-15 | 2018-12-21 | 苏州萨伯工业设计有限公司 | Four gear drive method of machine liquid mixing |
DE102018212114A1 (en) * | 2018-07-20 | 2020-01-23 | Robert Bosch Gmbh | Directional control valve with detent, kick-out and neutral start protection |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2393962A (en) * | 1943-03-09 | 1946-02-05 | Electrical Inc | Fluid actuated lock cylinder |
US2768610A (en) * | 1953-11-12 | 1956-10-30 | Mead Specialties Company Inc | Control mechanism for pressure fluid apparatus |
US3161400A (en) * | 1963-05-14 | 1964-12-15 | Audco Ltd | Fluid control valve |
US3402642A (en) * | 1965-10-23 | 1968-09-24 | Huck Mfg Co | Reciprocating valve and piston |
US3790125A (en) * | 1972-10-31 | 1974-02-05 | Fluid Controls Inc | Control valve with power accumulating, snap action, spool drive |
US3941141A (en) * | 1974-05-03 | 1976-03-02 | Robert Eddie L | Blowout preventer locking apparatus and method |
US3972398A (en) * | 1975-04-17 | 1976-08-03 | Caterpillar Tractor Co. | Parking brake and transmission valve interlock |
US4083382A (en) * | 1976-06-03 | 1978-04-11 | J. I. Case Company | Regulating valve with hydraulic detent |
US4309022A (en) * | 1980-04-14 | 1982-01-05 | Consolidated Controls Corporation | Poppet valve actuator apparatus |
US4716933A (en) * | 1986-10-16 | 1988-01-05 | J. I. Case Company | Valve unit |
DE3923743A1 (en) | 1989-07-18 | 1991-01-24 | Bosch Gmbh Robert | Hydraulic two=way valve with locking device - has release mechanism for low pressure as well as for excessive working pressure |
DE4107980A1 (en) * | 1991-03-13 | 1992-09-17 | Bosch Gmbh Robert | Hydraulically activated latching mechanism for piston valve - has piston rod with groove that receives ball to secure element to internal bush |
DE10157030A1 (en) | 2001-11-21 | 2003-05-28 | Bosch Gmbh Robert | Device for locking control slider of hydraulic distributor valve includes detent body and interacting profiled surface of coding body with different profiling in axial and circumferential directions |
DE102008022509A1 (en) * | 2008-05-07 | 2009-11-12 | Robert Bosch Gmbh | Directional valve with a locking device |
-
2010
- 2010-03-20 DE DE102010012158A patent/DE102010012158A1/en not_active Withdrawn
-
2011
- 2011-03-05 WO PCT/EP2011/001092 patent/WO2011116877A1/en active Application Filing
- 2011-03-05 JP JP2012557434A patent/JP2013522739A/en active Pending
- 2011-03-05 US US13/261,386 patent/US20120304850A1/en not_active Abandoned
- 2011-03-05 EP EP11708718.9A patent/EP2550461B1/en not_active Not-in-force
- 2011-03-05 PL PL11708718T patent/PL2550461T3/en unknown
Also Published As
Publication number | Publication date |
---|---|
EP2550461A1 (en) | 2013-01-30 |
JP2013522739A (en) | 2013-06-13 |
DE102010012158A1 (en) | 2011-09-22 |
PL2550461T3 (en) | 2015-05-29 |
WO2011116877A1 (en) | 2011-09-29 |
US20120304850A1 (en) | 2012-12-06 |
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