EP1138956A1 - Hydraulic circuit for actuating multiple hydraulic users - Google Patents
Hydraulic circuit for actuating multiple hydraulic users Download PDFInfo
- Publication number
- EP1138956A1 EP1138956A1 EP01400708A EP01400708A EP1138956A1 EP 1138956 A1 EP1138956 A1 EP 1138956A1 EP 01400708 A EP01400708 A EP 01400708A EP 01400708 A EP01400708 A EP 01400708A EP 1138956 A1 EP1138956 A1 EP 1138956A1
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- EP
- European Patent Office
- Prior art keywords
- hydraulic
- pressure
- distributor
- receiver
- specific
- 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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
- F15B11/166—Controlling a pilot pressure in response to the load, i.e. supply to at least one user is regulated by adjusting either the system pilot pressure or one or more of the individual pilot command pressures
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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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
- F15B11/162—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load for giving priority to particular servomotors or users
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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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
- F15B11/163—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load for sharing the pump output equally amongst users or groups of users, e.g. using anti-saturation, pressure compensation
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
- F15B2211/3053—In combination with a pressure compensating valve
- F15B2211/30555—Inlet and outlet of the pressure compensating valve being connected to the directional control valve
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/31—Directional control characterised by the positions of the valve element
- F15B2211/3105—Neutral or centre positions
- F15B2211/3111—Neutral or centre positions the pump port being closed in the centre position, e.g. so-called closed centre
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/32—Directional control characterised by the type of actuation
- F15B2211/329—Directional control characterised by the type of actuation actuated by fluid pressure
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/505—Pressure control characterised by the type of pressure control means
- F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
- F15B2211/50518—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/505—Pressure control characterised by the type of pressure control means
- F15B2211/50554—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure downstream of the pressure control means, e.g. pressure reducing valve
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
- F15B2211/5151—Pressure control characterised by the connections of the pressure control means in the circuit being connected to a pressure source and a directional control valve
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
- F15B2211/5159—Pressure control characterised by the connections of the pressure control means in the circuit being connected to an output member and a return line
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/605—Load sensing circuits
- F15B2211/6051—Load sensing circuits having valve means between output member and the load sensing circuit
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/78—Control of multiple output members
Definitions
- specific hydraulic distributor means we mean not a distributor means having a special structure and / or function (although it may actually be so), but only designate the distributor means included in the hydraulic circuit which is assigned specifically to actuation of said particular hydraulic receiver at high flow consumption.
- the device multiple hydraulic distribution comprising a multiplicity of distributor means having a function of detection of the highest charge pressure, a anti-saturation function and a division function of charge independent flow will be referred to, for simplify, "DDIC distributor device”.
- a common example of a hydraulic receiver requiring a large hydraulic flow is constituted by a large hydraulic hammer supported at the end of a articulated boom and arm system driven by cylinders respective hydraulics controlled by the above device DDIC distribution.
- a receiver can also be for example a small hydraulic hand hammer, a reversible hydraulic motor driving a mower carried at the end of a system of articulated arms (treatment of roadside slopes), ....
- the specific distributor means suitable for ordering particular receiver, was connected directly to the hydraulic source, in parallel on the device DDIC distributor. Under these conditions, when the particular receiver was in operation and he then absorbed all or at least the largest part of the flow supplied by the hydraulic source, actuation of another controlled hydraulic receiver by the DDIC distributor device was revealed impossible. For example, to fix ideas, while the hydraulic hammer was in operation it was cannot control one or more of the arms / boom of its support system to axially advance this hammer as the hole was dug.
- the invention therefore aims to remedy, in as far as possible, to the aforementioned drawbacks of current practice and to propose an arrangement improved hydraulic circuit which allows order the above receiver appropriately particular kept in operation.
- a hydraulic circuit for actuation multiple hydraulic loads as mentioned is characterized in the preamble, being arranged in accordance with the invention, in that the circuit pressure reducer hydraulic control of the specific distributor means is adjustable, thanks to which it is possible to preset the operating speed of said particular receiver and therefore to keep it running in predetermined conditions.
- the hydraulic circuit of specific dispenser order includes in addition to a pressure limiter calibrated for a value predetermined corresponding to the maximum pressure admissible for the order of said distributor means specific.
- the circuit hydraulic control of the specific distributor means further includes at least one control solenoid valve On Off.
- the circuit hydraulic control of the specific distributor means includes two on / off control solenoid valves corresponding respectively to the two possible meanings of operation.
- a hydraulic circuit which includes a hydraulic distribution device 1 which comprises a plurality of distributor means 2 which are assigned to the control of respective hydraulic receivers and which have a pressure detection function highest load (LS pressure) of all receptors, an anti-saturation function and a flow division independent of the load (means DDIC distributors).
- the distribution device 1 comprises an input block 3, several distribution blocks 2 (here four blocks 2 1 to 2 4 are shown by way of example), and finally a final block 4.
- the dispensing device 1 can be constituted in the form of a sealed stack, face to face, of the blocks listed above.
- Each inlet and distribution block is traversed face to face by three conduits, namely a conduit for supplying pressurized fluid P, a conduit for return of the working fluid T to a reservoir and a conduit for control fluid under the highest charge pressure (LS pressure). Because the blocks are stacked against each other, the various conduits follow one another and constitute three continuous lines of fluid circulation passing right through the distribution device 1 (line P, line T and line LS , respectively).
- the final block 4 seals the terminal ends of the above three lines.
- the inlet block 3 has an inlet port authorizing the connection of line P to a source S of fluid under pressure.
- the source S consists of a variable flow pump 6 fitted a power regulator 7 controlled by the LS pressure delivered by the line LS of the distribution device 1; but other types of hydraulic source can be put implemented in the context of the invention.
- the block inlet 3 has an outlet opening allowing the connection of line T to a tank R.
- Input block 3 can be fitted with all organs (not shown) traditionally arranged in this location for effective operation and distribution device 1 and which are well known to those skilled in the art.
- Each distribution block 2 2 to 2 4 can be constituted in a substantially identical manner.
- a distributor of type DDIC 8 2 to three is provided. tracks and three positions (shown in neutral position) which is connected, on the one hand, to the lines P, T and LS above and, on the other hand, to two working orifices A 2 , B 2 to which a hydraulic receiver is connected 10 2 to be ordered by said distributor 8 2 .
- the movement of the distributor valve 8 2 can for example be controlled hydraulically and in this case, as shown in FIG. 1, the two hydraulic controls associated with the opposite ends of the drawer are respectively connected to two respective control orifices a 2 , b 2 to which is connected an appropriate control member such as for example a manipulator or the like (not shown).
- a two-way, three-position balance 9 2 receives the working fluid pressure (via the third way of the distributor 8 2 ) and the LS pressure, so that this balance is subject to the difference between the LS pressure, of a side, and the working pressure of the receiver 10 2 , on the other side, and that it establishes a connection with the line LS in the case where the working pressure of the receiver 10 2 becomes higher than the pressure LS.
- Two pressure relief valves 11 2 are disposed respectively in the starting lines A 2 , B 2 .
- the hydraulic receivers 10 2 , 10 3 and 10 4 may, for example, be hydraulic jacks animating the arms and boom of a work machine and be in any number.
- the specific distributor block 2 1 is, for its part, for controlling a particular hydraulic receiver 12.
- This receiver 12 is assumed, in the context of the invention, to absorb on its own all or at least most of the flow supplied by the hydraulic source S.
- a receiver can for example be a hydraulic hammer 12 1 carried at the end of the arm / boom system of the machine, or even be a hydraulic hand hammer 12 2 .
- Such a receiver 12 operates in single-acting mode (spring return) and it is therefore connected between only one of the working orifices (B 1 for example) of the block 2 1 and the reservoir. Therefore the other working orifice A 1 is annihilated.
- the distributor block 2 1 can be identical to the block 2 2 described above, or else (as illustrated) be adapted to its particular control function by having only one pressure relief valve 11 1 associated with the working orifice B 1 and a single control of the distributor drawer 8 1 connected to the control orifice a 1 .
- a control circuit 13 which incorporates a pressure reducer 14, which is of the adjustable type as shown in FIG. 1 to allow a presetting of the operating speed of the receiver 12.
- the input from this pressure reducer 14 receives the pump pressure P and at the output is restored a reduced pressure (for example between 0 and 50 bars, against 150 to 250 bars for the pressure P) which is applied to the control input a 1 distributor block 2 1 .
- a solenoid valve 15 with one channel and two positions ON and OFF respectively.
- This solenoid valve can be controlled by an electrical switch (not shown) available to the user.
- the specific distributor block 2 1 suitable for controlling the particular receiver 12 is included in series in the multiple distributor DDIC device 1 and it is subject to the division of the flow independent of the load which authorizes the maintenance of this particular receiver 12 in operation when another of the receivers 10 2 to 10 4 is put into operation simultaneously.
- said particular receiver 12 keeps, thanks to its own control circuit 13, an appropriate control mode.
- the slowdown that can occur in the simultaneous operation of the particular receiver and the other receiver due to insufficient flow provided by the source S is not a prohibitive annoyance of the causes the other receiver to operate only sequentially and for short periods of time.
- Figure 2 shows a hydraulic diagram similar to that of Figure 1, but adapted to control a particular hydraulic receiver with two directions of operation. Therefore, such a circuit retains the possibility of controlling a single-acting tool (large hydraulic hammer 12 1 or small hydraulic hand hammer 12 2 ), but also a double-acting cylinder 12 3 or a reversible hydraulic motor 12 4 .
- the specific distributor block 2 1 is here arranged in the same way as the distributor block 2 2 described above. Its two outlet ports A 1 and B 1 are functional and two respective pressure relief valves 11 1 are used.
- the distributor 8 1 is provided with two hydraulic controls respectively for each direction of movement of the slide, which are connected respectively to the control orifices a 1 and b 1 .
- the control circuit 13 is arranged in the same manner as in FIG. 1, except that the single solenoid valve is replaced by two solenoid valves 15 a1 and 15 b1 mounted so as to be activatable in opposition in order to ensure control a 1 or b 1 , selectively.
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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)
- Operation Control Of Excavators (AREA)
Abstract
Description
La présente invention concerne des perfectionnements apportés aux circuits hydrauliques propres à l'actionnement de récepteurs hydrauliques multiples, ces circuits comprenant :
- une source de fluide hydraulique sous pression,
- au moins un dispositif de distribution hydraulique multiple comportant une pluralité de moyens distributeurs qui sont affectés à l'actionnement de récepteurs hydrauliques respectifs et qui possèdent une fonction de détection de la pression de charge la plus élevée (pression LS), une fonction antisaturation et une fonction de division de débit indépendante de la charge,
- au moins un moyen distributeur hydraulique spécifique affecté à l'actionnement d'un récepteur hydraulique particulier qui, en fonctionnement normal, peut requérir au moins la plus grande partie du débit maximum fourni par la susdite source hydraulique,
- ledit moyen distributeur spécifique étant, lui aussi, du type possédant une fonction de détection de la pression de charge la plus élevée, une fonction antisaturation et une fonction de division de débit indépendante de la charge et étant inclus dans le susdit dispositif de distribution hydraulique multiple en série avec les autres moyens distributeurs, et
- entre la source hydraulique et au moins une entrée de commande du moyen distributeur spécifique actionnant ledit récepteur particulier, un circuit de commande hydraulique incluant un réducteur de pression propre à abaisser la pression élevée du fluide hydraulique de sortie de la source jusqu'à une valeur de commande, de sorte qu'au moins un autre moyen distributeur peut être sollicité pour actionner un autre récepteur alors que ledit récepteur particulier est en fonctionnement.
- a source of hydraulic fluid under pressure,
- at least one multiple hydraulic distribution device comprising a plurality of distribution means which are assigned to the actuation of respective hydraulic receivers and which have a function for detecting the highest load pressure (LS pressure), an anti-saturation function and a flow division function independent of the load,
- at least one specific hydraulic distributor means assigned to the actuation of a particular hydraulic receiver which, in normal operation, may require at least the greatest part of the maximum flow rate supplied by the said hydraulic source,
- said specific distributor means also being of the type having a function for detecting the highest load pressure, an anti-saturation function and a flow division function independent of the load and being included in the above multiple hydraulic distribution device in series with the other distributor means, and
- between the hydraulic source and at least one control input of the specific dispensing means actuating said particular receiver, a hydraulic control circuit including a pressure reducer capable of reducing the high pressure of the hydraulic fluid leaving the source to a value of control, so that at least one other distributor means can be requested to actuate another receiver while said particular receiver is in operation.
Par moyen distributeur hydraulique "spécifique", on entend désigner non pas un moyen distributeur possédant une structure et/ou une fonction spéciale (bien qu'il puisse effectivement en être ainsi), mais seulement désigner celui des moyens distributeurs inclus dans le circuit hydraulique qui est affecté en propre à l'actionnement dudit récepteur hydraulique particulier à forte consommation de débit.By "specific" hydraulic distributor means, we mean not a distributor means having a special structure and / or function (although it may actually be so), but only designate the distributor means included in the hydraulic circuit which is assigned specifically to actuation of said particular hydraulic receiver at high flow consumption.
Dans la description qui suit, le dispositif de distribution hydraulique multiple comportant une multiplicité de moyens distributeurs ayant une fonction de détection de la pression de charge la plus élevée, une fonction antisaturation et une fonction de division de débit indépendante de la charge sera dénommé, pour simplifier, "dispositif distributeur DDIC".In the following description, the device multiple hydraulic distribution comprising a multiplicity of distributor means having a function of detection of the highest charge pressure, a anti-saturation function and a division function of charge independent flow will be referred to, for simplify, "DDIC distributor device".
Un exemple courant d'un récepteur hydraulique nécessitant un gros débit hydraulique est constitué par un gros marteau hydraulique supporté à l'extrémité d'un système de flèche et de bras articulés mus par des vérins hydrauliques respectifs commandés par le susdit dispositif de distribution DDIC. Mais un tel récepteur peut également être par exemple un petit marteau hydraulique à main, un moteur hydraulique réversible entraínant une tondeuse portée à l'extrémité d'un système de bras articulés (traitement des talus en bordure de route),....A common example of a hydraulic receiver requiring a large hydraulic flow is constituted by a large hydraulic hammer supported at the end of a articulated boom and arm system driven by cylinders respective hydraulics controlled by the above device DDIC distribution. But such a receiver can also be for example a small hydraulic hand hammer, a reversible hydraulic motor driving a mower carried at the end of a system of articulated arms (treatment of roadside slopes), ....
Dans les circuits antérieurement réalisés, le moyen distributeur spécifique, propre à la commande du récepteur particulier, était connecté directement sur la source hydraulique, en parallèle sur le dispositif distributeur DDIC. Dans ces conditions, lorsque le récepteur particulier était en fonctionnement et qu'il absorbait alors la totalité ou au moins la plus grande partie du débit fourni par la source hydraulique, l'actionnement d'un autre récepteur hydraulique commandé par le dispositif distributeur DDIC se révélait impossible. Par exemple, pour fixer les idées, tandis que le marteau hydraulique était en fonctionnement, il était impossible de commander un ou plusieurs des bras/flèche de son système de support pour faire progresser axialement ce marteau au fur et à mesure que le trou était creusé.In previously completed circuits, the specific distributor means, suitable for ordering particular receiver, was connected directly to the hydraulic source, in parallel on the device DDIC distributor. Under these conditions, when the particular receiver was in operation and he then absorbed all or at least the largest part of the flow supplied by the hydraulic source, actuation of another controlled hydraulic receiver by the DDIC distributor device was revealed impossible. For example, to fix ideas, while the hydraulic hammer was in operation it was cannot control one or more of the arms / boom of its support system to axially advance this hammer as the hole was dug.
Dans l'agencement exposé plus haut, on remédie au problème exposé en intégrant le moyen distributeur spécifique de commande du récepteur particulier dans le dispositif distributeur DDIC, de sorte que c'est l'ensemble des moyens distributeurs, y compris le moyen distributeur spécifique, qui fonctionnent selon le mode de la division du débit indépendante de la charge. Il en résulte la possibilité de commander, conjointement avec le récepteur particulier qui peut rester en fonctionnement, au moins un autre récepteur - par exemple déplacement axial d'un marteau hydraulique en fonctionnement -.In the arrangement described above, we remedy the problem exposed by integrating the distributor means specific command of the particular receiver in the DDIC dispenser device, so that's all the distributing means, including the means specific distributor, which operate according to the mode of the flow division independent of the load. It results the possibility of ordering, jointly with the particular receiver which can remain in operation, at least one other receiver - for example displacement axial of a hydraulic hammer in operation -.
Toutefois, malgré les avantages obtenus, le circuit précédent ne se révèle pas encore entièrement satisfaisant dans la mesure où l'utilisateur doit contrôler simultanément un trop grand de paramètres hydrauliques et que, par ailleurs, il est important que le susdit récepteur particulier reste en fonctionnement avec toute son efficacité (les autres récepteurs commandés simultanément conformément aux dispositions indiquées pouvant, quant à eux, fonctionner à vitesse réduite).However, despite the benefits, the previous circuit is not yet fully revealed satisfactory to the extent that the user must check too many parameters simultaneously hydraulic and that, moreover, it is important that the said receiver remains in operation with all its effectiveness (the other receivers ordered simultaneously in accordance with the provisions indicated which can operate at reduced speed).
L'invention a donc pour but de remédier, dans toute la mesure du possible, aux inconvénients précités de la pratique actuelle et de proposer un agencement perfectionné de circuit hydraulique qui permette de commander de façon approprié le susdit récepteur particulier maintenu en fonctionnement.The invention therefore aims to remedy, in as far as possible, to the aforementioned drawbacks of current practice and to propose an arrangement improved hydraulic circuit which allows order the above receiver appropriately particular kept in operation.
A ces fins, un circuit hydraulique pour l'actionnement de charges hydrauliques multiples tel que mentionné au préambule se caractérise, étant agencé conformément à l'invention, en ce que le réducteur de pression du circuit hydraulique de commande du moyen distributeur spécifique est réglable, ce grâce à quoi il est possible de prérégler la vitesse de fonctionnement dudit récepteur particulier et donc de le maintenir en fonctionnement dans des conditions prédéterminées.For these purposes, a hydraulic circuit for actuation multiple hydraulic loads as mentioned is characterized in the preamble, being arranged in accordance with the invention, in that the circuit pressure reducer hydraulic control of the specific distributor means is adjustable, thanks to which it is possible to preset the operating speed of said particular receiver and therefore to keep it running in predetermined conditions.
Pour assurer la sécurité de fonctionnement du circuit, il est souhaitable que le circuit hydraulique de commande du moyen distributeur spécifique comprenne en outre un limiteur de pression taré pour une valeur prédéterminée correspondant à la pression maximale admissible pour la commande dudit moyen distributeur spécifique.To ensure operational safety of the circuit, it is desirable that the hydraulic circuit of specific dispenser order includes in addition to a pressure limiter calibrated for a value predetermined corresponding to the maximum pressure admissible for the order of said distributor means specific.
De préférence, afin que le récepteur particulier puisse être mis en fonctionnement indépendamment des autres récepteurs, on peut prévoir que le circuit hydraulique de commande du moyen distributeur spécifique comprenne en outre au moins une électrovanne de commande Marche/Arrêt.Preferably, so that the particular receiver can be operated independently of other receivers, we can foresee that the circuit hydraulic control of the specific distributor means further includes at least one control solenoid valve On Off.
Dans le cas où le récepteur particulier peut fonctionner dans deux sens possible (par exemple moteur hydraulique réversible, vérin à double effet), le circuit hydraulique de commande du moyen distributeur spécifique comprend deux électrovannes de commande Marche/Arrêt correspondant respectivement aux deux sens possible de fonctionnement. In the event that the particular receiver can operate in two possible directions (e.g. motor reversible hydraulics, double-acting cylinder), the circuit hydraulic control of the specific distributor means includes two on / off control solenoid valves corresponding respectively to the two possible meanings of operation.
Au total, les dispositions mises en oeuvre conformément à l'invention constituent une solution technique très intéressante aux problèmes qui se présentaient dans les agencements antérieurs.In total, the provisions implemented according to the invention constitute a solution very interesting technique to the problems that presented in previous arrangements.
L'invention sera mieux comprise à la lecture de la description détaillée qui suit de certains modes de réalisation préférés donnés uniquement à titre d'exemples non limitatifs. Dans cette description, on se réfère aux dessins annexés sur lesquels :
- la figure 1 illustre un schéma de circuit hydraulique conforme à l'invention adapté pour un récepteur particulier à un seul sens de fonctionnement ; et
- la figure 2 illustre un schéma de circuit hydraulique conforme à l'invention adapté pour un récepteur particulier à deux sens possible de fonctionnement.
- Figure 1 illustrates a hydraulic circuit diagram according to the invention adapted for a particular receiver with only one direction of operation; and
- FIG. 2 illustrates a diagram of a hydraulic circuit according to the invention adapted for a particular receiver with two possible directions of operation.
En se reportant tout d'abord à la figure 1, il y est représenté un circuit hydraulique qui comporte un dispositif de distribution hydraulique 1 qui comprend une pluralité de moyens distributeurs 2 qui sont affectés à la commande de récepteurs hydrauliques respectifs et qui possèdent une fonction de détection de la pression de charge la plus élevée (pression LS) de tous les récepteurs, une fonction antisaturation et une fonction de division de débit indépendante de la charge (moyens distributeurs DDIC) .Referring first to Figure 1, there a hydraulic circuit is represented which includes a hydraulic distribution device 1 which comprises a plurality of distributor means 2 which are assigned to the control of respective hydraulic receivers and which have a pressure detection function highest load (LS pressure) of all receptors, an anti-saturation function and a flow division independent of the load (means DDIC distributors).
D'une façon classique, le dispositif de
distribution 1 comprend un bloc d'entrée 3, plusieurs
blocs de distribution 2 (ici quatre blocs 21 à 24 sont
représentés à titre d'exemple), et enfin un bloc final 4.
D'une façon connue, le dispositif de distribution 1 peut
être constitué sous forme d'un empilement étanche, face
contre face, des blocs énoncés ci-dessus. Chaque bloc
d'entrée et de distribution est traversé de face à face
par trois conduits, à savoir un conduit d'alimentation en
fluide sous pression P, un conduit de retour du fluide de
travail T vers un réservoir et un conduit de fluide de
commande sous la pression de charge la plus élevée
(pression LS). Du fait que les blocs sont empilés les uns
contre les autres, les divers conduits se succèdent les
uns aux autres et constituent trois lignes continues de
circulation de fluide traversant de part en part le
dispositif de distribution 1 (ligne P, ligne T et ligne
LS, respectivement).In a conventional manner, the distribution device 1 comprises an
Le bloc final 4 obture de façon étanche les extrémités terminales des trois lignes précitées.The final block 4 seals the terminal ends of the above three lines.
Le bloc d'entrée 3 comporte un orifice d'entrée
autorisant le raccordement de la ligne P à une source S de
fluide sous pression. Dans l'exemple illustré, la source S
est constituée par une pompe à débit variable 6 équipée
d'un régulateur de puissance 7 piloté par la pression LS
délivrée par la ligne LS du dispositif de distribution 1 ;
mais d'autres types de source hydraulique peuvent être mis
en oeuvre dans le cadre de l'invention. Enfin, le bloc
d'entrée 3 comporte un orifice de sortie autorisant le
raccordement de la ligne T à un réservoir R.The
Le bloc d'entrée 3 peut être équipé de tous les
organes (non représentés) traditionnellement disposés en
cet emplacement pour un fonctionnement effectif et
efficace du dispositif de distribution 1 et qui sont bien
connus de l'homme du métier.
Chaque bloc de distribution 22 à 24 peut être constitué de façon sensiblement identique. En prenant comme exemple le bloc 22 dont la structure a été détaillée (les autres blocs 23 et 24 sont schématisés sous forme de rectangles vides pour ne pas alourdir la figure), il est prévu un distributeur de type DDIC 82 à trois voies et trois positions (montré en position neutre) qui est raccordé, d'une part, aux lignes P, T et LS précitées et, d'autre part, à deux orifices de travail A2, B2 auxquels est connecté un récepteur hydraulique 102 devant être commandé par ledit distributeur 82. Le déplacement du tiroir du distributeur 82 peut par exemple être commandé hydrauliquement et dans ce cas, comme représenté à la figure 1, les deux commandes hydrauliques associées aux extrémités opposées du tiroir sont respectivement raccordées à deux orifices de commande respectifs a2, b2 auxquels est connecté un organe de commande approprié tel que par exemple un manipulateur ou analogue (non montré).Each distribution block 2 2 to 2 4 can be constituted in a substantially identical manner. Taking block 2 2 as an example, the structure of which has been detailed (the other blocks 2 3 and 2 4 are shown diagrammatically in the form of empty rectangles so as not to weigh down the figure), a distributor of type DDIC 8 2 to three is provided. tracks and three positions (shown in neutral position) which is connected, on the one hand, to the lines P, T and LS above and, on the other hand, to two working orifices A 2 , B 2 to which a hydraulic receiver is connected 10 2 to be ordered by said distributor 8 2 . The movement of the distributor valve 8 2 can for example be controlled hydraulically and in this case, as shown in FIG. 1, the two hydraulic controls associated with the opposite ends of the drawer are respectively connected to two respective control orifices a 2 , b 2 to which is connected an appropriate control member such as for example a manipulator or the like (not shown).
Une balance 92 à deux voies et trois positions reçoit la pression de fluide de travail (via la troisième voie du distributeur 82) et la pression LS, de manière que cette balance soit soumise à la différence entre la pression LS, d'un côté, et la pression de travail du récepteur 102, de l'autre côté, et qu'elle établisse une liaison avec la ligne LS dans le cas où la pression de travail du récepteur 102 devient supérieure à la pression LS.A two-way, three-position balance 9 2 receives the working fluid pressure (via the third way of the distributor 8 2 ) and the LS pressure, so that this balance is subject to the difference between the LS pressure, of a side, and the working pressure of the receiver 10 2 , on the other side, and that it establishes a connection with the line LS in the case where the working pressure of the receiver 10 2 becomes higher than the pressure LS.
Deux limiteurs de pression 112 sont disposés
respectivement dans les lignes de départ A2, B2.Two
Les récepteurs hydrauliques 102, 103 et 104 peuvent, par exemple, être des vérins hydrauliques animant des bras et flèche d'un engin de travaux et être en nombre quelconque.The hydraulic receivers 10 2 , 10 3 and 10 4 may, for example, be hydraulic jacks animating the arms and boom of a work machine and be in any number.
Le bloc distributeur spécifique 21 est, lui,
destiné à la commande d'un récepteur hydraulique
particulier 12. Ce récepteur 12 est supposé, dans le cadre
de l'invention, absorber à lui seul la totalité ou au
moins la plus grande partie du débit fourni par la source
hydraulique S. Un tel récepteur peut par exemple être un
marteau hydraulique 121 porté à l'extrémité du système
bras/flèche de l'engin, voire être un marteau hydraulique
à main 122. Un tel récepteur 12 fonctionne sur le mode à
simple effet (rappel par ressort) et il est donc connecté
entre un seul des orifices de travail (B1 par exemple) du
bloc 21 et le réservoir. De ce fait l'autre orifice de
travail A1 est annihilé. Le bloc distributeur 21 peut être
identique au bloc 22 décrit plus haut, ou bien (comme
illustré) être adapté à sa fonction de commande
particulière en ne possédant qu'un seul limiteur de
pression 111 associé à l'orifice de travail B1 et une
seule commande du tiroir du distributeur 81 raccordé à
l'orifice de commande a1.The specific distributor block 2 1 is, for its part, for controlling a particular hydraulic receiver 12. This receiver 12 is assumed, in the context of the invention, to absorb on its own all or at least most of the flow supplied by the hydraulic source S. Such a receiver can for example be a hydraulic hammer 12 1 carried at the end of the arm / boom system of the machine, or even be a hydraulic hand hammer 12 2 . Such a receiver 12 operates in single-acting mode (spring return) and it is therefore connected between only one of the working orifices (B 1 for example) of the block 2 1 and the reservoir. Therefore the other working orifice A 1 is annihilated. The distributor block 2 1 can be identical to the block 2 2 described above, or else (as illustrated) be adapted to its particular control function by having only one
A l'orifice de commande a1 est raccordé un circuit
de commande 13 qui incorpore un réducteur de pression 14,
qui est de type réglable comme montré à la figure 1 pour
permettre un préréglage de la vitesse de fonctionnement du
récepteur 12. L'entrée de ce réducteur de pression 14
reçoit la pression de pompe P et en sortie est restituée
une pression réduite (par exemple entre 0 et 50 bars,
contre 150 à 250 bars pour la pression P) qui est
appliquée à l'entrée de commande a1 du bloc distributeur
21.To the control orifice a 1 is connected a
Pour que le récepteur hydraulique 12 puisse être
mis en fonctionnement ou arrêté indépendamment des autres
récepteurs 102 à 104, on insère, en aval du réducteur de
pression 14, une électrovanne 15 à une voie et deux
positions respectivement MARCHE et ARRET. Cette
électrovanne peut être commandée par un commutateur
électrique (non montré) à disposition de l'utilisateur. So that the hydraulic receiver 12 can be put into operation or stopped independently of the other receivers 10 2 to 10 4 , there is inserted, downstream of the
Pour assurer la sécurité vis-à-vis d'une surcharge
hydraulique, on peut prévoir, à la sortie du réducteur de
pression 13, un limiteur de pression 16 taré pour la
valeur maximale de la pression admissible pour la commande
du distributeur 81.To ensure safety against a hydraulic overload, it is possible to provide, at the outlet of the
Ainsi, le bloc distributeur spécifique 21
approprié pour la commande du récepteur particulier 12 est
inclus en série dans le dispositif distributeur multiple
DDIC 1 et il est soumis à la division du débit indépendant
de la charge qui autorise le maintien de ce récepteur
particulier 12 en fonctionnement lorsqu'un autre des
récepteurs 102 à 104 est mis en fonctionnement
simultanément. De plus, ledit récepteur particulier 12
conserve, grâce au circuit de commande propre 13, un mode
de commande approprié.Thus, the specific distributor block 2 1 suitable for controlling the particular receiver 12 is included in series in the multiple distributor DDIC device 1 and it is subject to the division of the flow independent of the load which authorizes the maintenance of this particular receiver 12 in operation when another of the receivers 10 2 to 10 4 is put into operation simultaneously. In addition, said particular receiver 12 keeps, thanks to its
En particulier, s'agissant d'un gros marteau hydraulique 121, il est possible, grâce à la mise en oeuvre des moyens précédemment exposés, de provoquer, sans arrêt du fonctionnement du marteau 121, son déplacement axial séquentiel en agissant sur un ou plusieurs des vérins 102 à 104 d'actionnement des bras/flèche de support ; le marteau peut alors être maintenu en permanence en appui convenable contre l'obstacle et la qualité de son travail s'en trouve améliorée.In particular, in the case of a large hydraulic hammer 12 1 , it is possible, thanks to the use of the means described above, to cause, without stopping the operation of the hammer 12 1 , its sequential axial displacement by acting on a or more of the actuators 10 2 to 10 4 for actuating the support arms / boom; the hammer can then be kept permanently in suitable support against the obstacle and the quality of its work is improved.
Le ralentissement qui peut intervenir dans le fonctionnement simultané du récepteur particulier et de l'autre récepteur en raison de l'insuffisance du débit fourni par la source S n'est pas une gêne rédhibitoire du fait que l'autre récepteur n'est mis en fonctionnement que séquentiellement et pendant de brefs laps de temps.The slowdown that can occur in the simultaneous operation of the particular receiver and the other receiver due to insufficient flow provided by the source S is not a prohibitive annoyance of the causes the other receiver to operate only sequentially and for short periods of time.
La figure 2 montre un schéma hydraulique analogue à celui de la figure 1, mais adapté pour commander un récepteur hydraulique particulier à double sens de fonctionnement. De ce fait, un tel circuit conserve la possibilité d'une commande d'un outil à fonctionnement à simple effet (gros marteau hydraulique 121 ou petit marteau hydraulique à main 122), mais aussi un vérin à double effet 123 ou un moteur hydraulique réversible 124.Figure 2 shows a hydraulic diagram similar to that of Figure 1, but adapted to control a particular hydraulic receiver with two directions of operation. Therefore, such a circuit retains the possibility of controlling a single-acting tool (large hydraulic hammer 12 1 or small hydraulic hand hammer 12 2 ), but also a double-acting cylinder 12 3 or a reversible hydraulic motor 12 4 .
A cet effet le bloc distributeur spécifique 21 est
ici agencé de la même manière que le bloc distributeur 22
décrit plus haut. Ses deux orifices de sortie A1 et B1
sont fonctionnels et deux limiteurs de pression 111
respectifs sont mis en oeuvre. Le distributeur 81 est
pourvu de deux commandes hydrauliques respectivement pour
chaque sens de déplacement du tiroir, qui sont raccordées
respectivement aux orifices de commande a1 et b1.To this end, the specific distributor block 2 1 is here arranged in the same way as the distributor block 2 2 described above. Its two outlet ports A 1 and B 1 are functional and two respective
Le circuit de commande 13 est agencé de la même
manière qu'à la figure 1, à ceci près que l'électrovanne
unique est remplacée par deux électrovannes 15a1 et 15b1
montées de manière à être activables en opposition afin
d'assurer la commande a1 ou b1, sélectivement.The
Claims (6)
caractérisé en ce que le circuit hydraulique de commande (13) du moyen distributeur spécifique (21) comprend en outre un limiteur de pression (16) taré pour une valeur prédéterminée correspondant à la pression maximale admissible pour la commande dudit moyen distributeur spécifique (21).Hydraulic circuit according to claim 1,
characterized in that the hydraulic control circuit (13) of the specific dispensing means (2 1 ) further comprises a pressure relief valve (16) calibrated for a predetermined value corresponding to the maximum admissible pressure for the control of said specific dispensing means (2 1 ).
caractérisé en ce que le récepteur particulier est un vérin à double effet (123) ou un moteur hydraulique à double sens de rotation (124) .Hydraulic circuit according to claim 4,
characterized in that the particular receiver is a double-acting cylinder (12 3 ) or a hydraulic motor with two directions of rotation (12 4 ).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0003900A FR2807118B1 (en) | 2000-03-28 | 2000-03-28 | HYDRAULIC CIRCUIT FOR OPERATING MULTIPLE HYDRAULIC RECEIVERS |
FR0003900 | 2000-03-28 | ||
US09/817,798 US20020134079A1 (en) | 2000-03-28 | 2001-03-26 | Hydraulic circuit for actuating multiple hydraulic receivers |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1138956A1 true EP1138956A1 (en) | 2001-10-04 |
EP1138956B1 EP1138956B1 (en) | 2003-05-07 |
Family
ID=26212297
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01400708A Expired - Lifetime EP1138956B1 (en) | 2000-03-28 | 2001-03-16 | Hydraulic circuit for actuating multiple hydraulic users |
Country Status (4)
Country | Link |
---|---|
US (1) | US20020134079A1 (en) |
EP (1) | EP1138956B1 (en) |
JP (1) | JP2001311405A (en) |
FR (1) | FR2807118B1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007096099A1 (en) * | 2006-02-21 | 2007-08-30 | Robert Bosch Gmbh | Control device and hydraulic pilot control |
CN101864786A (en) * | 2010-06-21 | 2010-10-20 | 三一重机有限公司 | Driving speed reducer for hydraulic excavator |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006513881A (en) * | 2002-12-13 | 2006-04-27 | ジー−ピー ジプサム コーポレイション | Gypsum panel with UV-curing and moisture-resistant coating and method for producing the same |
KR101005060B1 (en) * | 2007-07-30 | 2010-12-30 | 볼보 컨스트럭션 이큅먼트 에이비 | heavy equipment hydraulic circuit of having variable control device |
ITUA20162611A1 (en) * | 2016-04-14 | 2017-10-14 | Cnh Ind Italia Spa | HYDRAULIC CIRCUIT FOR CONTROL AND POWER AND CONSTRUCTION VEHICLE INCLUDING SUCH CIRCUIT |
CN111677490B (en) * | 2020-06-19 | 2023-07-14 | 中国铁建重工集团股份有限公司 | Control system of dual-purpose drilling machine for water hammer and core drill and multifunctional drilling machine |
CN111691492B (en) * | 2020-06-30 | 2022-06-28 | 徐州徐工挖掘机械有限公司 | Hydraulic system of excavator and excavator |
CN112695822A (en) * | 2021-02-01 | 2021-04-23 | 雷沃工程机械集团有限公司 | Excavator quartering hammer control system |
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EP0191275A1 (en) * | 1985-02-14 | 1986-08-20 | TRINOVA S.p.A. | Anti-saturation system for hydraulic control circuits for working members of earth-moving machines |
WO1990002882A1 (en) * | 1988-09-09 | 1990-03-22 | Atlas Copco Aktiebolag | Hydraulic driving system with a priority function for hydraulic motors |
DE3844399A1 (en) * | 1988-12-30 | 1990-07-12 | Rexroth Mannesmann Gmbh | Variable-displacement pump for a plurality of consumers which can be actuated independently of one another |
DE4036720A1 (en) * | 1990-11-17 | 1992-05-21 | Linde Ag | CONTROL CIRCUIT FOR THE LOAD-INDEPENDENT DISTRIBUTION OF A PRESSURE FLOW |
EP0550257A1 (en) * | 1991-12-25 | 1993-07-07 | Kayaba Industry Co., Ltd. | Device for controlling multiple hydraulic actuators |
FR2744497A1 (en) * | 1996-02-07 | 1997-08-08 | Rexroth Sigma | MULTIPLE HYDRAULIC DISTRIBUTION DEVICE |
EP0884482A1 (en) * | 1996-02-28 | 1998-12-16 | Komatsu Ltd. | Control device for hydraulic drive machine |
Family Cites Families (2)
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JP2000283110A (en) * | 1999-03-31 | 2000-10-13 | Komatsu Ltd | Flow controller for hydraulic drive machine |
JP3511500B2 (en) * | 2000-07-10 | 2004-03-29 | 新キャタピラー三菱株式会社 | Hydraulic circuit of construction machinery |
-
2000
- 2000-03-28 FR FR0003900A patent/FR2807118B1/en not_active Expired - Fee Related
-
2001
- 2001-03-16 EP EP01400708A patent/EP1138956B1/en not_active Expired - Lifetime
- 2001-03-26 JP JP2001088635A patent/JP2001311405A/en active Pending
- 2001-03-26 US US09/817,798 patent/US20020134079A1/en not_active Abandoned
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0191275A1 (en) * | 1985-02-14 | 1986-08-20 | TRINOVA S.p.A. | Anti-saturation system for hydraulic control circuits for working members of earth-moving machines |
WO1990002882A1 (en) * | 1988-09-09 | 1990-03-22 | Atlas Copco Aktiebolag | Hydraulic driving system with a priority function for hydraulic motors |
DE3844399A1 (en) * | 1988-12-30 | 1990-07-12 | Rexroth Mannesmann Gmbh | Variable-displacement pump for a plurality of consumers which can be actuated independently of one another |
DE4036720A1 (en) * | 1990-11-17 | 1992-05-21 | Linde Ag | CONTROL CIRCUIT FOR THE LOAD-INDEPENDENT DISTRIBUTION OF A PRESSURE FLOW |
EP0550257A1 (en) * | 1991-12-25 | 1993-07-07 | Kayaba Industry Co., Ltd. | Device for controlling multiple hydraulic actuators |
FR2744497A1 (en) * | 1996-02-07 | 1997-08-08 | Rexroth Sigma | MULTIPLE HYDRAULIC DISTRIBUTION DEVICE |
EP0884482A1 (en) * | 1996-02-28 | 1998-12-16 | Komatsu Ltd. | Control device for hydraulic drive machine |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007096099A1 (en) * | 2006-02-21 | 2007-08-30 | Robert Bosch Gmbh | Control device and hydraulic pilot control |
CN101389869B (en) * | 2006-02-21 | 2012-11-14 | 罗伯特-博世股份公司 | Control device and hydraulic pilot control |
US8322375B2 (en) | 2006-02-21 | 2012-12-04 | Robert Bosch Gmbh | Control device and hydraulic pilot control |
CN101864786A (en) * | 2010-06-21 | 2010-10-20 | 三一重机有限公司 | Driving speed reducer for hydraulic excavator |
Also Published As
Publication number | Publication date |
---|---|
US20020134079A1 (en) | 2002-09-26 |
FR2807118B1 (en) | 2002-07-05 |
JP2001311405A (en) | 2001-11-09 |
FR2807118A1 (en) | 2001-10-05 |
EP1138956B1 (en) | 2003-05-07 |
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