EP0684389A2 - Steuereinrichtung für hydraulisches System mit mehreren Verbrauchern - Google Patents

Steuereinrichtung für hydraulisches System mit mehreren Verbrauchern Download PDF

Info

Publication number
EP0684389A2
EP0684389A2 EP95202287A EP95202287A EP0684389A2 EP 0684389 A2 EP0684389 A2 EP 0684389A2 EP 95202287 A EP95202287 A EP 95202287A EP 95202287 A EP95202287 A EP 95202287A EP 0684389 A2 EP0684389 A2 EP 0684389A2
Authority
EP
European Patent Office
Prior art keywords
pressure
actuators
valve
operating
control 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.)
Granted
Application number
EP95202287A
Other languages
English (en)
French (fr)
Other versions
EP0684389B1 (de
EP0684389A3 (de
Inventor
Hideshi Koiwai
Hisato Naito
Yoshitake Yonekubo
Kenichi Nishiumi
Yoshimi Hasegawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KYB Corp
Original Assignee
Kayaba Industry Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from JP03357128A external-priority patent/JP3124094B2/ja
Priority claimed from JP21224492A external-priority patent/JPH0633904A/ja
Priority claimed from JP04250517A external-priority patent/JP3128775B2/ja
Application filed by Kayaba Industry Co Ltd filed Critical Kayaba Industry Co Ltd
Publication of EP0684389A2 publication Critical patent/EP0684389A2/de
Publication of EP0684389A3 publication Critical patent/EP0684389A3/de
Application granted granted Critical
Publication of EP0684389B1 publication Critical patent/EP0684389B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2221—Control of flow rate; Load sensing arrangements
    • E02F9/2232—Control of flow rate; Load sensing arrangements using one or more variable displacement pumps
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2221—Control of flow rate; Load sensing arrangements
    • E02F9/2225—Control of flow rate; Load sensing arrangements using pressure-compensating valves
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2278—Hydraulic circuits
    • E02F9/2296—Systems with a variable displacement pump
    • 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
    • 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
    • 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
    • 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
    • F15B2211/20553—Type of pump variable capacity with pilot circuit, e.g. for controlling a swash plate
    • 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
    • F15B2211/25—Pressure control functions
    • 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
    • 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
    • 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
    • F15B2211/40576—Assemblies of multiple valves
    • F15B2211/40584—Assemblies of multiple valves the flow control means arranged in parallel with a check 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
    • F15B2211/46—Control of flow in the return line, i.e. meter-out control
    • 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
    • F15B2211/47—Flow control in one direction only
    • F15B2211/473—Flow control in one direction only without restriction in the reverse direction
    • 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
    • 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
    • F15B2211/5153—Pressure control characterised by the connections of the pressure control means in the circuit being connected to an output member 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
    • F15B2211/50—Pressure control
    • F15B2211/55—Pressure control for limiting a pressure up to a maximum pressure, e.g. by using a pressure relief 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
    • F15B2211/575—Pilot pressure control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/605—Load sensing circuits
    • F15B2211/6051—Load sensing circuits having valve means between output member and the load sensing circuit
    • F15B2211/6054—Load sensing circuits having valve means between output member and the load sensing circuit using shuttle valves
    • 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
    • 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
    • F15B2211/65—Methods of control of the load sensing pressure
    • F15B2211/654—Methods of control of the load sensing pressure the load sensing pressure being lower than the load pressure
    • 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

Definitions

  • This invention relates to a control device for multiple hydraulic actuators, and more particularly to a control device which is adapted to control multiple hydraulic actuators by means of one variable pump, thereby to be suitably used for an industrial vehicle.
  • a control device for multiple hydraulic actuators which comprises a plurality of actuators provided with operating valves, respectively, a single variable pump for feeding hydraulic fluid to the actuators, a variable orifice which is connected to a feed passage and each of the actuators communicating with the feed passage and of which a degree of opening is controlled depending on the amount of changing-over of each of the operating valves, a pressure compensating valve arranged on a downstream side of each of the variable orifices to keep a pressure difference between a load pressure and a pressure on the downstream side of the variable orifice constant, and a control mechanism for causing the load pressure and a discharge pressure of the variable pump to act as a pilot pressure and the discharge pressure of the variable pump to be kept increased by a predetermined level as compared with the load pressure.
  • the control device of the present invention generally constructed as described above is characterised in that the operating valve of specific one of the actuators is connected on a downstream side thereof to a feed side of each of the other actuators through the converging passage and the converging passage is provided with a change-over valve which is changed over to an open position when the operating valve of each of the other actuators is changed over.
  • the pilot change-over valve is changed over to permit a part of hydraulic fluid fed to an operation system of the specific actuator to be fed to the other actuators, resulting in an excessive increase in circuit pressure of the operation system being effectively prevented.
  • FIG. 3 is a circuit diagram showing a power shovel which has been conventionally known in the art.
  • a variable pump 1 is connected on a discharge side thereof to a high pressure flow passage 2.
  • the high pressure passage 2 is connected to an input port 5 of a first operating valve 40 connected to a boom cylinder 37, an input port 5 of a second operating valve 41 connected to a bucket cylinder 38, and an input port 5 of a third operating valve 42 connected to a spin motor 39.
  • variable orifices 6 are rendered open. The degree of opening of the variable orifices 6 is determined depending on the amount of changing-over of the operating valves 40, 41 and 42, respectively.
  • relay ports 61 are provided respectively.
  • the relay ports 61 are arranged so as to communicate with pressure compensating valves 8, respectively.
  • the pressure compensating valves 8 are arranged so as to communicate on a downstream side thereof with feed ports 9 of the first, second and third operating valves 40, 41 and 42, respectively.
  • the feed ports 9 are adapted to be kept closed when the operating valves 40, 41 and 42 are each at the neutral position and communicate with either actuator port 10 or 11, when the operating valves 40, 41 and 42 are changed over the their respective lateral positions. At this time, the remaining actuator ports which do not communicate with the feed ports are kept communicating with tank passages 62, respectively.
  • the first to third operating valves 40, 41 and 42 are formed with load detecting ports 13, respectively.
  • the load detecting ports 13 are adapted to communicate with the tank passages 62, respectively, when the first to third operating valves 40, 41 and 42 are each at the neutral position.
  • the load detecting ports 13 are caused to communicate with the actuator ports positioned on a high pressure side.
  • the above-described pressure compensating valves 8 are adapted to introduce a pressure on an upstream side of the pressure compensating valves 8 to one of the pilot chambers 8a of the respective valve 8 and a pressure on a side of the load detecting ports 13 to the other pilot chamber 8b of the respective valve 8.
  • Such introduction of the pressure is selected by a plurality of shuttle valves 14 so that a maximum load pressure in each of circuit systems is introduced into each of the other pilot chambers 8b.
  • the pressure compensating valves 8 carry out controlling in a manner to permit a pressure on the downstream side of the variable orifices 6 to be kept increased by a predetermined level as compared with the maximum load pressure.
  • the maximum load pressure selected by the shuttle valves 14 is introduced to one pilot chamber 63a of a control valve 63 for controlling the variable pump 1.
  • the other pilot chamber 63b of the control valve 63 is fed with a pressure in the high pressure flow passage 2 or a discharge pressure of the variable pump 1.
  • the control valve 63 is caused to operate depending on a relative difference between the discharge pressure of the variable pump 1 and the maximum load pressure.
  • Such operation of the control valve 63 causes a control cylinder 64 to operate so that the discharge pressure of the variable pump 1 may be kept constantly increased by a predetermined level as compared with the maximum load pressure.
  • reference numeral 65 designates a main relief valve, which functions to set a maximum pressure of the circuit system of each of the boom cylinder 37, bucket cylinder 38 and spin motor 39.
  • Co-operation between the amount of discharge of the variable pump 1 and the amount of control of the pressure compensating valves 8 permits fluid to be fed to the actuators in an amount proportional to the amount of changing-over of the first to third operating valves 40, 41 and 42.
  • the conventional control system constructed as described above is of the load-sensing type, wherein the variable pump 1 discharges a pressure slightly higher than the maximum load pressure and the pressure compensating valves 8 of the circuit system control the variable orifices 6 of the first to third operating valves 40, 41 and 42 depending on the maximum load pressure. This causes a pressure difference between both sides of each of the variable orifices 6 to be kept constant, thereby to permit fluid to be fed to the actuators in an amount proportional to the amount of changing-over of the operating valves.
  • the maximum load pressure established in any of the multiple hydraulic actuators causes the discharge pressure of the variable pump 1 to be controlled, thereby to increase energy loss in the following cases.
  • a load pressure is rapidly increased for accelerating the inertia body at a moment of changing-over of the operating valves, resulting in a pressure in the circuit being increased to a set pressure of the main relief valve 65.
  • the circuit pressure thus increased constitutes a control signal for each of the first to third operating valves 40, 41 and 42 and variable pump 1. Therefore, if a large amount of hydraulic fluid is flowed under a low pressure in a circuit system other than a spin circuit system, the variable pump 1 is obliged to discharge hydraulic fluid at an increased flow rate under a high pressure. Thus, it is required to feed hydraulic fluid at a large flow rate under a high pressure to the circuit system which requires that hydraulic fluid is fed thereto at a large flow rate under a high pressure for the sake of the spin circuit system which requires to feed hydraulic fluid at a micro flow rate and under a high pressure, so that energy loss is extensively increased.
  • the present invention has been made in view of the foregoing disadvantage of the prior art.
  • FIG. 1 a first embodiment of a control device for multiple hydraulic actuators according to the present invention is illustrated.
  • the relay port 61 of the third operating valve 42 and the pressure compensating valve 8 communicating with the relay port 61 are connected through a converging passage 44 to a side of an inlet port 68 of a change-over valve 67.
  • An outlet port 69 of the change-over valve 67 is connected through a load check valve 72 to a side of a bottom of the boom cylinder 37.
  • the change-over valve 67 When the change-over valve 67 thus arranged is at a normal position shown in Figure 1, it interrupts communication between the inlet port 68 and the outlet port 69. Also, the change-over valve 67 is changed over to its upper open position (as shown in Figure 1) when a pilot pressure acts on a pilot chamber 70 of the change-over valve 67, thereby to cause both ports 68 and 69 to communicate with an orifice 71. Thus, when the boom cylinder 37 is extended, the change-over valve 67 is changed over to the open position.
  • FIG. 2 a second embodiment of a control device for multiple hydraulic actuators according to the present invention is illustrated, which is so constructed that a downstream side of a pressure compensating valve 8 and a feed port 9 of a third operating valve 42 are connected to an inlet port 68 of a change-over valve 67 through a converging passage 44.
  • the remaining part of the second embodiment is constructed in substantially the same manner as the first embodiment described above.
  • the control device for the multiple hydraulic actuators permits, when a load pressure of one of the actuators is increased, a part of hydraulic fluid fed to the one actuator to be fed to the other actuators. This effectively prevents the one actuator which is required to be fed with hydraulic fluid in a micro-amount under a high pressure from decreasing a discharge quantity of the variable pump, thereby to minimize energy loss.
EP95202287A 1991-12-25 1992-12-23 Steuereinrichtung für hydraulisches System mit mehreren Verbrauchern Expired - Lifetime EP0684389B1 (de)

Applications Claiming Priority (10)

Application Number Priority Date Filing Date Title
JP35712891 1991-12-25
JP357128/91 1991-12-25
JP03357128A JP3124094B2 (ja) 1991-12-25 1991-12-25 複数アクチュエータの制御装置
JP212244/92 1992-07-16
JP21224492 1992-07-16
JP21224492A JPH0633904A (ja) 1992-07-16 1992-07-16 負荷感応形制御装置
JP25051792 1992-08-26
JP04250517A JP3128775B2 (ja) 1992-08-26 1992-08-26 負荷感応形制御装置
JP250517/92 1992-08-26
EP19920311770 EP0550257B1 (de) 1991-12-25 1992-12-23 Einrichtung zur Steuerung mehrerer Servomotoren

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP19920311770 Division EP0550257B1 (de) 1991-12-25 1992-12-23 Einrichtung zur Steuerung mehrerer Servomotoren
EP92311770.9 Division 1992-12-23

Publications (3)

Publication Number Publication Date
EP0684389A2 true EP0684389A2 (de) 1995-11-29
EP0684389A3 EP0684389A3 (de) 1996-10-30
EP0684389B1 EP0684389B1 (de) 1999-09-08

Family

ID=27329339

Family Applications (4)

Application Number Title Priority Date Filing Date
EP19920311770 Expired - Lifetime EP0550257B1 (de) 1991-12-25 1992-12-23 Einrichtung zur Steuerung mehrerer Servomotoren
EP95202288A Expired - Lifetime EP0684388B1 (de) 1991-12-25 1992-12-23 Lastdruckkompensierte hydraulische Steuereinrichtung
EP95202286A Expired - Lifetime EP0684387B1 (de) 1991-12-25 1992-12-23 Lastdruckkompensierte hydraulische Steuereinrichtung
EP95202287A Expired - Lifetime EP0684389B1 (de) 1991-12-25 1992-12-23 Steuereinrichtung für hydraulisches System mit mehreren Verbrauchern

Family Applications Before (3)

Application Number Title Priority Date Filing Date
EP19920311770 Expired - Lifetime EP0550257B1 (de) 1991-12-25 1992-12-23 Einrichtung zur Steuerung mehrerer Servomotoren
EP95202288A Expired - Lifetime EP0684388B1 (de) 1991-12-25 1992-12-23 Lastdruckkompensierte hydraulische Steuereinrichtung
EP95202286A Expired - Lifetime EP0684387B1 (de) 1991-12-25 1992-12-23 Lastdruckkompensierte hydraulische Steuereinrichtung

Country Status (2)

Country Link
EP (4) EP0550257B1 (de)
DE (4) DE69225392T2 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110671376A (zh) * 2019-09-29 2020-01-10 中国矿业大学 工程机械负载敏感-进出口独立液压系统及其控制方法

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19719228A1 (de) * 1997-05-07 1998-11-12 Bosch Gmbh Robert Hydraulische Steuereinrichtung zur lastdruckunabhängigen Steuerung eines doppeltwirkenden Motors
DE19831595B4 (de) * 1998-07-14 2007-02-01 Bosch Rexroth Aktiengesellschaft Hydraulische Schaltung
FR2807118B1 (fr) * 2000-03-28 2002-07-05 Mannesmann Rexroth Sa Circuit hydraulique pour l'actionnement de recepteurs hydrauliques multiples
EP2635747B1 (de) * 2010-11-01 2019-09-25 Volvo Construction Equipment AB Verfahren zur steuerung eines hydrauliksteuersystems einer arbeitsmaschine
CN104627880B (zh) * 2014-12-31 2017-02-22 中联重科股份有限公司 闭式系统、控制方法、卷扬系统和履带式车辆行走系统

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3710699C1 (de) * 1987-03-31 1988-08-18 Heilmeier & Weinlein Hydraulische Steuervorrichtung fuer eine Verbrauchergruppe
SE8803181D0 (sv) * 1988-09-09 1988-09-09 Atlas Copco Ab Hydraulic driving system with a priority function for hydraulic motors
WO1990014519A1 (en) * 1989-05-24 1990-11-29 Kabushiki Kaisha Komatsu Seisakusho Hydraulic circuit apparatus

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110671376A (zh) * 2019-09-29 2020-01-10 中国矿业大学 工程机械负载敏感-进出口独立液压系统及其控制方法

Also Published As

Publication number Publication date
DE69225392T2 (de) 1998-09-03
EP0550257B1 (de) 1998-05-06
EP0684389B1 (de) 1999-09-08
EP0684389A3 (de) 1996-10-30
EP0684388A3 (de) 1996-11-06
DE69229966T2 (de) 2000-03-09
DE69229968D1 (de) 1999-10-14
DE69229968T2 (de) 2000-03-09
EP0684388A2 (de) 1995-11-29
DE69228489D1 (de) 1999-04-01
EP0684388B1 (de) 1999-02-24
EP0684387A2 (de) 1995-11-29
DE69229966D1 (de) 1999-10-14
EP0684387A3 (de) 1996-10-30
EP0684387B1 (de) 1999-09-08
DE69225392D1 (de) 1998-06-10
DE69228489T2 (de) 1999-09-30
EP0550257A1 (de) 1993-07-07

Similar Documents

Publication Publication Date Title
JP3124094B2 (ja) 複数アクチュエータの制御装置
KR960006358B1 (ko) 유압구동장치 및 방향전환밸브
US4343151A (en) Series - parallel selector for steering and implement
EP0648900A2 (de) Hydraulischen Gerät für Baumaschinen
US5129229A (en) Hydraulic drive system for civil-engineering and construction machine
US6209321B1 (en) Hydraulic controller for a working machine
EP0684389B1 (de) Steuereinrichtung für hydraulisches System mit mehreren Verbrauchern
US6499296B1 (en) Hydraulic circuit
EP0877168A1 (de) Hydraulischer antriebsapparat
EP0439621A1 (de) Zufuhrschaltungsvorrichtung für öl unter druck zum hydraulischem kolben einer baustellenvorrichtung
EP0586214B1 (de) Steuereinrichtung für Verbraucher
JPH0882289A (ja) 可変容量油圧ポンプの容量制御装置
EP0404956A1 (de) Zufuhr von öl unter druck für den zylinder einer maschine
KR0162960B1 (ko) 굴삭기의 조작성 향상 유량제어장치
EP0440801B2 (de) Hydraulische schaltung
EP0433454B1 (de) Hydraulische schaltungsvorrichtung
JP2555287B2 (ja) 油圧制御装置
KR0166117B1 (ko) 굴삭기의 조작성 향상 유량제어장치
EP1193400B1 (de) Hydraulikkreislauf für Baumaschinen
EP1172565B1 (de) Hydraulischer Schaltkreis einer Arbeitsmaschine
EP0051603B1 (de) Serien-parallel-wähler für lenkung und arbeitswerkzeug
GB2288888A (en) Hydraulic circuit for turning
EP0461258A1 (de) Steuereinheit für den schwenkbaren oberbau eines hydraulikbaggers
EP3882472B1 (de) Fluidsteuerungsvorrichtung
JPS6234961B2 (de)

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AC Divisional application: reference to earlier application

Ref document number: 550257

Country of ref document: EP

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): DE FR GB

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

RHK1 Main classification (correction)

Ipc: F15B 11/05

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE FR GB

17P Request for examination filed

Effective date: 19970407

17Q First examination report despatched

Effective date: 19980218

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AC Divisional application: reference to earlier application

Ref document number: 550257

Country of ref document: EP

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB

REF Corresponds to:

Ref document number: 69229968

Country of ref document: DE

Date of ref document: 19991014

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20061208

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20061220

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20061221

Year of fee payment: 15

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20071223

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20080701

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20081020

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20071223

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20071231