EP3390842B1 - Dispositif de soupape hydraulique avec plusieurs sections de travail et une systeme de commande de pompe - Google Patents

Dispositif de soupape hydraulique avec plusieurs sections de travail et une systeme de commande de pompe Download PDF

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Publication number
EP3390842B1
EP3390842B1 EP16823216.3A EP16823216A EP3390842B1 EP 3390842 B1 EP3390842 B1 EP 3390842B1 EP 16823216 A EP16823216 A EP 16823216A EP 3390842 B1 EP3390842 B1 EP 3390842B1
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EP
European Patent Office
Prior art keywords
pump
line
flow rate
load
valve device
Prior art date
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Application number
EP16823216.3A
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German (de)
English (en)
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EP3390842A1 (fr
Inventor
Massimiliano Musiani
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Walvoil SpA
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Walvoil SpA
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
    • F04B49/24—Bypassing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B23/00—Pumping installations or systems
    • F04B23/02—Pumping installations or systems having reservoirs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/002—Hydraulic systems to change the pump delivery
    • 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
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
    • F15B11/042—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the feed line, i.e. "meter in"
    • 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
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
    • F15B11/044—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the return line, i.e. "meter out"
    • 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
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
    • F15B11/05—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed specially adapted to maintain constant speed, e.g. pressure-compensated, load-responsive
    • F15B11/055—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed specially adapted to maintain constant speed, e.g. pressure-compensated, load-responsive by adjusting the pump output or bypass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
    • F15B11/165—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load for adjusting the pump output or bypass in response to demand
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20546—Type of pump variable capacity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3105—Neutral or centre positions
    • F15B2211/3116—Neutral or centre positions the pump port being open in the centre position, e.g. so-called open centre
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40507—Flow control characterised by the type of flow control means or valve with constant throttles or orifices
    • 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
    • F15B2211/40—Flow control
    • F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
    • F15B2211/41554—Flow control characterised by the connections of the flow control means in the circuit being connected to a return line and a directional control valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/45—Control of bleed-off flow, e.g. control of bypass flow to the return line
    • 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
    • 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
    • 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
    • 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
    • F15B2211/635—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements
    • F15B2211/6355—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements having valve means

Definitions

  • the present invention relates to the field of hydraulic valve devices with open circuit and multiple working elements or sections designed to control a pump.
  • variable displacement pump the hydraulic pressure taken upstream of an orifice placed at the end of the bypass line, also called carry-over, is sent to the pump regulator.
  • control is such that, with decreasing pressure upstream of the orifice, the flow rate sent by the variable displacement pump increases. Therefore, it is said that it is a negative control circuit.
  • these systems also provide that the pump still generates a minimum flow and the balance between flow rate and control pressure of the pump regulator is as in the accompanying figure 4 .
  • the flow rate to the utility at a certain stroke of the relative spool depends on the load, if the load increases, the flow rate to the utility decreases and that through the orifice increases, with a consequent reduction of the flow rate sent, up to reach a new balance point in which the flow rate to the utility and that sent will have decreased while the flow rate through the orifice will have increased.
  • bypass line is further narrowed resulting in a reduction of the flow rate through the bypass line itself and through choke 2, with consequent decrease of the control signal to the pump and increase of the flow rate from the delivery to the utilities.
  • the flow rate is divided between the two utilities on the basis of the reciprocal loads and as these loads vary, the division among the driven utilities varies and so does the sum of the single flow rates.
  • a first object of the present invention is to provide a valve device which allows eliminating some limits of the control system of a variable displacement, negative control or LS pump within a simple, rational and cost-effective solution.
  • a first aspect of the invention is to provide a valve device comprising a pressure regulator on the bypass line adapted to keep the pressure drop constant only along the bypass line through the elements of the device.
  • figure 1 shows an example of prior art, in particular a negative control variable displacement pump the displacement of which is determined by the control pressure N.
  • the control pressure N is given by the flow rate load losses through the fixed choke 2.
  • control negative pump a feature of the control negative pump is that the displacement (and thus the flow rate supplied) increases with decreasing control pressure PN and vice versa.
  • control negative pump a feature of the control negative pump is that the displacement (and thus the flow rate supplied) increases with decreasing control pressure PN and vice versa.
  • FIG 2 shows a circuit of the type comprising a variable displacement pump according to the present invention.
  • variable displacement pump indicated with PA
  • PA the type of variable displacement pump
  • the delivery is connected in P1 to the entry side FE.
  • One or more elements E1...En (in the case 2 elements E1 and E2) of the crossing type that allows connecting the PA pump and the tank to the various utilities through the uses (A1, B1, A2, B2).
  • a bleeding side FS keeps the flow rates from the bypass line LC separate from those coming from the return of the utilities and from the bleeds of the valves and connects them both to tank T through two separate lines.
  • valve device in figure 2 there is at least one delivery line P1 connected to the variable displacement pump for negative control systems PA, which feeds the side FE and the crossing elements E1 and E2, downstream at high pressure; it is noted that the number of elements varies depending on the number of utilities to connect.
  • a bypass or crossing line is also provided, indicated with LC, connecting the delivery P1 to the tank: however, contrary to what happens in standard crossing valve distributors, where they all are connected so as to come out of a single fitting, in the present invention the bypass line, and thus the flow rate flowing into line LC is kept separate with respect to the lines of the return flow rates of utilities and valves, which equally go to tank T but with two separate fittings, that is:
  • bypass line LC and the return of the utilities and the valve bleeds are connected to tank T.
  • Valve 5 in this example is calibrated at 30 bar.
  • This flow rate creates a certain load loss along the bypass line LC through the elements (E1, E2), thus generating a defined pressure just downstream of the regulator 5.
  • the regulator 5 is calibrated just above such a pressure value.
  • This system also provides that the pump still generates a minimum flow and the balance between flow rate and control pressure of the pump regulator is as in figure 4 .
  • the displacement is determined by the control pressure N.
  • the control pressure N is given by the flow rate load losses through the fixed choke 2.
  • the inclusion of the regulator 5 imposes a constant pressure PC.
  • the regulator 5 is in fact configured so as to keep the pressure constant at its calibration value, then it intervenes by reducing the flow rate (only in the bypass line LC) at that value, whereby the load losses are equal to the calibration of the regulator 5.
  • the regulator 5 prevents this additional flow rate from flowing in the bypass line LC.
  • Said additional flow rate only flows towards the actuated utility, i.e. through the load line 4 and to the utility.
  • bypass line LC narrows further resulting, in the order:
  • a fixed pressure of the bypass line LC before the first element and being the pressure in the tank fixed and considered null a fixed pressure drop is set by said regulator 5 between the beginning of the LC before the first section and the tank.
  • regulator 5 only on the bypass line LC sets the pressure stage ⁇ P; in addition, the passage area through the bypass line LC is known and defined: the value of a given flow rate Q is thus obtained from the formula, which crosses all the line LC and orifice 2 (the latter placed on the same line, downstream).
  • control signal N is taken after all the elements E1..En but before the fixed choke 2, it follows that the pressure at that point is given by the load losses of the determined flow rate Q through choke 2 (considering the pressure in tank T as null).
  • said predetermined flow rate Q must be equal to the minimum one of pump PA.
  • the circuit of the valve device shown is, as said, adapted to also control a load sensing pump.
  • control feeds the control signal of the negative control pump and generates a flow rate inversely proportional to the control pressure (in turn inversely proportional to the stroke of the spools).
  • said control signal N now closes a suitable choke, i.e. a proportional opening tray 7, a tray that is placed along the load line 4.
  • FIG 5 it is illustrated another possible embodiment of the invention which comprises a load sensing pump PA; instead of the choke 7 is observed the presence of another choke 17 of a proportional opening drawer, in this case said choke 17 is located along the delivery line, upstream of the junction that separates LC and the load line 4; the connection line N now acts on the relative drawer so that:
  • An LS signal downstream of said choke of tray 7, 17 arrives at the LS PA pump, so the latter sends a flow rate proportional to the opening of the choke, in turn inversely proportional to the control pressure which is in turn inversely proportional to the stroke of spools C1, C2, ...Cn.
  • control signal is configured for opening in a manner inversely proportional the choke of the tray 7, 17 while a signal (LS) from the load line 4, downstream said choke, arrives to the pump.
  • the valve device has a regulator valve 5 only on the bypass line LC and upstream of the first element E1.
  • the valve device makes the flow rate to the utility independent of the load and allows setting a maximum flow rate at the end of the stroke; in multiple drives, it ensures that the sum of the required flow rates is independent of the loads.
  • the regulator 5 is configured so as to impose a constant pressure drop along the single bypass line LC and through the elements E1, En.
  • the bypass line LC is configured to be connected to tank T through a fitting C, independent of the fitting into which the return flow rates of utilities and valves flow.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fluid-Pressure Circuits (AREA)

Claims (3)

  1. Dispositif à vanne directionnelle modulaire, équipé d'un ou plusieurs éléments (E1, E2, ... En), ledit dispositif à vanne étant adapté à la commande d'une pompe volumétrique variable (PA), ledit ou plusieurs éléments (E1, ... En) étant de type croisé et permettant une connexion entre la pompe volumétrique variable (PA) et un réservoir, à des différents services au moyen d'utilisations respectives (A1, B1, A2, B2) ; ledit dispositif à vanne comprenant au moins une ligne d'alimentation (P1) et ledit dispositif à vanne étant disposé pour être connecté à la pompe (PA) par ladite au moins une ligne d'alimentation (P1) et comprenant en outre au moins une ligne de chargement (4) pour connecter ladite au moins une ligne d'alimentation (P1) aux services, ladite au moins une ligne de chargement (4) traversant une bobine respective dudit un ou plusieurs éléments (E1, E2, ... En), ladite au moins une ligne de chargement (4) connectant en parallèle ladite bobine respective, un raccord de connexion du réservoir à une ligne basse pression (T) du dispositif à vanne directionnelle modulaire, à l'intérieur duquel passent les débits de retour des services, un étranglement (2) étant disposé sur une ligne de dérivation (LC) du dispositif à vanne directionnelle modulaire, en aval d'un dernier élément (En) dudit un ou plusieurs éléments (E1, E2, ... En), ledit dispositif à vanne comprenant en outre : une ligne de connexion (N) pour se connecter directement ou indirectement à une ligne d'un signal de commande de la pompe (PA), ladite ligne de connexion (N) étant apte à dériver le signal de commande sur la ligne de dérivation (LC) entre un dernier élément (En) d'un ou plusieurs éléments et l'étranglement (2), où un régulateur de pression (5) est disposé seulement dans la ligne de dérivation (LC) et en amont du premier élément (E1) dudit un ou plusieurs éléments (E1, E2, ... En), le régulateur (5) étant configuré de manière à appliquer une perte de pression constante le long de la ligne de dérivation (LC) et à travers lesdits un ou plusieurs éléments (E1, E2, ... En), où le dispositif à vanne est caractérisé en ce que ladite ligne de chargement (4) est connectée à ladite ligne de dérivation (LC) en amont dudit régulateur de pression (5).
  2. Dispositif à vanne selon la revendication 1, caractérisé en ce que la pompe (PA) est une pompe volumétrique variable du type avec un système à commande négative.
  3. Dispositif à vanne selon la revendication 1, caractérisé en ce que la pompe (PA) est une pompe volumétrique variable du type à détection de chargement.
EP16823216.3A 2015-12-16 2016-12-16 Dispositif de soupape hydraulique avec plusieurs sections de travail et une systeme de commande de pompe Active EP3390842B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITUB2015A009570A ITUB20159570A1 (it) 2015-12-16 2015-12-16 Dispositivo valvolare idraulico a piu' sezioni di lavoro con sistema di controllo della pompa
PCT/EP2016/081392 WO2017103079A1 (fr) 2015-12-16 2016-12-16 Dispositif de vanne hydraulique comprenant multiples sections de travail avec système de commande de pompe

Publications (2)

Publication Number Publication Date
EP3390842A1 EP3390842A1 (fr) 2018-10-24
EP3390842B1 true EP3390842B1 (fr) 2022-09-21

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EP16823216.3A Active EP3390842B1 (fr) 2015-12-16 2016-12-16 Dispositif de soupape hydraulique avec plusieurs sections de travail et une systeme de commande de pompe

Country Status (4)

Country Link
US (1) US20180372088A1 (fr)
EP (1) EP3390842B1 (fr)
IT (1) ITUB20159570A1 (fr)
WO (1) WO2017103079A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITUB20159571A1 (it) * 2015-12-18 2017-06-18 Walvoil Spa Dispositivo valvolare idraulico a piu' sezioni di lavoro con sistema di controllo della pompa con linea di by-pass
JP7314404B2 (ja) * 2020-03-30 2023-07-25 日立建機株式会社 作業機械

Citations (1)

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Publication number Priority date Publication date Assignee Title
US20140318116A1 (en) * 2011-12-08 2014-10-30 Kawasak Jukogyo Kabushiki Kaisha Hydraulic control device and construction machinery including same

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JPS57197336A (en) * 1981-05-29 1982-12-03 Komatsu Ltd Oil-pressure circuit for turning excavator
DE3532816A1 (de) * 1985-09-13 1987-03-26 Rexroth Mannesmann Gmbh Steueranordnung fuer mindestens zwei von mindestens einer pumpe gespeiste hydraulische verbraucher
JPH03229001A (ja) * 1990-02-01 1991-10-11 Kayaba Ind Co Ltd 流体圧アクチュエータの駆動回路
DE4027047A1 (de) * 1990-08-27 1992-03-05 Rexroth Mannesmann Gmbh Ventilanordnung zur lastunabhaengigen steuerung mehrerer hydraulischer verbraucher
US6244158B1 (en) * 1998-01-06 2001-06-12 Fps, Inc. Open center hydraulic system with reduced interaction between branches
CN1274810A (zh) * 1999-05-21 2000-11-29 株式会社岛津制作所 多阀门装置
JP5357864B2 (ja) * 2008-03-31 2013-12-04 株式会社不二越 建設機械の油圧回路
KR20110076073A (ko) * 2009-12-29 2011-07-06 볼보 컨스트럭션 이큅먼트 에이비 네가티브 컨트롤방식 유압시스템
JP5395268B2 (ja) * 2010-06-22 2014-01-22 日立建機株式会社 作業車両の油圧制御装置
JP2012141037A (ja) * 2011-01-05 2012-07-26 Hitachi Constr Mach Co Ltd 建設機械の油圧アクチュエータ駆動回路

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140318116A1 (en) * 2011-12-08 2014-10-30 Kawasak Jukogyo Kabushiki Kaisha Hydraulic control device and construction machinery including same

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WO2017103079A1 (fr) 2017-06-22
ITUB20159570A1 (it) 2017-06-16
EP3390842A1 (fr) 2018-10-24
US20180372088A1 (en) 2018-12-27

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