KR920701585A - 밸브장치 및 유압회로장치 - Google Patents

밸브장치 및 유압회로장치

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Publication number
KR920701585A
KR920701585A KR1019910700261A KR910700261A KR920701585A KR 920701585 A KR920701585 A KR 920701585A KR 1019910700261 A KR1019910700261 A KR 1019910700261A KR 910700261 A KR910700261 A KR 910700261A KR 920701585 A KR920701585 A KR 920701585A
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South Korea
Prior art keywords
pressure
passage
load
variable throttle
valve
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KR1019910700261A
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English (en)
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KR950004530B1 (ko
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겐로꾸 스기야마
도이찌 히라다
Original Assignee
오까다 하지메
히다찌 겐끼 가부시기가이샤
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Publication of KR920701585A publication Critical patent/KR920701585A/ko
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Publication of KR950004530B1 publication Critical patent/KR950004530B1/ko

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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
    • E02F9/2278—Hydraulic circuits
    • E02F9/2296—Systems with a variable displacement pump
    • 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
    • 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
    • E02F9/2278—Hydraulic circuits
    • E02F9/2285—Pilot-operated systems
    • 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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/0416—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor with means or adapted for load sensing
    • F15B13/0417—Load sensing elements; Internal fluid connections therefor; Anti-saturation or pressure-compensation 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
    • F15B2211/20—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
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30505—Non-return valves, i.e. check 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
    • F15B2211/30—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
    • F15B2211/30535—In combination with a pressure compensating valve the pressure compensating valve is arranged between pressure source and 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
    • F15B2211/305—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
    • F15B2211/31—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
    • 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
    • F15B2211/3144—Directional control characterised by the positions of the valve element the positions being continuously variable, e.g. as realised by proportional 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
    • F15B2211/30—Directional control
    • F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
    • F15B2211/3157—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line
    • F15B2211/31576—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line having a single pressure source and a single output member
    • 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
    • F15B2211/30—Directional control
    • F15B2211/35—Directional control combined with flow control
    • F15B2211/351—Flow control by regulating means in feed line, i.e. meter-in 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
    • F15B2211/50—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
    • F15B2211/505—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
    • F15B2211/50536—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using unloading valves controlling the supply pressure by diverting fluid 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
    • F15B2211/515—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
    • F15B2211/50—Pressure control
    • F15B2211/52—Pressure control characterised by the type of actuation
    • F15B2211/528—Pressure 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
    • F15B2211/50—Pressure control
    • F15B2211/56—Control of an upstream 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
    • F15B2211/60—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
    • F15B2211/6052—Load sensing circuits having valve means between output member and the load sensing circuit using check 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
    • F15B2211/605—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
    • F15B2211/605—Load sensing circuits
    • F15B2211/6058—Load sensing circuits with isolator valves

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Operation Control Of Excavators (AREA)

Abstract

내용 없음

Description

밸브장치 및 유압회로장치
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음
제1도는 본원 발명의 제1의 실시예에 의한 밸브장치를 구비한 유압회로장치의 개략도이다, 제3도는 그 밸브장치의 구조를 도시한 단면도이다. 제4도는 본원 발명의 제2의 실시예에 의한 밸브장치를 구비한 유압회로장치의 개략도이다.

Claims (9)

  1. 압유공급원(11)에 연락되는 공급통로(35)및 액튜에이터(12)에 연락되는 1쌍의 부하통로(36,37)와 상기 공급통로와 상기 1쌍의 부하통로와의 사이에 배치되고, 또한 축방향으로 이동가능한 밸브스풀(45;42A)에 형성되고, 이 밸브스풀의 이동량에 따라 폐쇄상태로 부터 연속적으로 개구면적을 변화시키는 1쌍의 가변스로틀부(43,44)와, 상기 1쌍의 가변스로틀부와 상기 1쌍의 부하통로와의 사이에 위치하는 제1의 통로(39,86,87)를 가진 최소한 하나의 방향전환밸브(31;31A)와; 상기 가변스로틀부의 전후차압을 소정치로 유지하는 압력조정수단(32;32A)과; 상기 제1의 통로(39,86,87)로 부터 분기되어, 상기 액튜에이터의 작동에 의해 발생하는 부하압력이 유도되는 검출관로(57;57A)와; 검출관로에 따라 유도된 부하압력과 다른 부하압력중의 최대부하압력을 선택하는 고압선택 수단(59;90,91)과; 상기 고압선택수단으로 선택된 최대부하압력을 제어압력으로서 상기 압력조정수단으로 유도하는 제어관로(61,62)를 구비한 밸브장치(10;10A)에 있어서, 상기 제1의 통로(39;86)의 상기 검출관로(57;57A)의 분기점보다 하류측에 배치되고, 상기 가변스로틀부의 한쪽(43)이 개방되었을 때에, 상기 제1의 통로로부터 그 한쪽의 가변스로틀부에 대응하는 부하통로(36)로 향하는 압유의 흐름은 가능하게 하고, 역방향의 압유의 흐름은 저지하는 제1의 흐름제어수단(71,73;86,73)을 구비한 것을 특징으로 하는 밸브장치.
  2. 제1항에 있어서, 상기 제1의 흐름제어수단 (71,73;86,73)은 상기 밸브스풀(42;42A)내에 배설되어 있는 것을 특징으로 하는 밸브장치.
  3. 제1항에 있어서, 상기 제1의 흐름제어수단은 상기 밸브스풀(42;42A)내에 형성되고, 상기 가변스로틀부의 한쪽(43)이 개방되었을 때에 상기 제1의 통로(39;86)에 있어서, 상기 검출관로(57)의 분기점보다 하류측의 부분과 상기 한쪽의 가변스로틀부(43)에 대응하는 부하통로(36)를 연락하는 제2의 통로(71;86)와, 상기 제2의 통로(71;86)에 배치되고, 상기 대응하는 부하통로(36)로부터 상기 제1의 통로(39;86)로 향하는 압유의 흐름을 저지하는 제크밸브(73)를 구비한 것을 특징으로 하는 밸브장치.
  4. 제1항에 있어서, 상기 제1의 통로(49;89)의 상기 검출관로(58;58A)의 분기점보다 하류에 배치되고, 상기 가변스로틀부의 한쪽(54)이 개방되었을 때에, 상기 제1의 통로로부터 그 한쪽의 가변스로틀부에 대응하는 부하통로(47)로 향하는 압류의 흐름은 가능하게하고, 역방향의 압유의 흐름은 저지하는 제2의 흐름제어수단 (54,76;89,76)을 더 구비한 것을 특징으로 하는 밸브장치.
  5. 제1항에 있어서, 상기 압력조정수단이 상기 1쌍의 가변스로틀부(43,44)와 상기 제1의 통로(39)와의 사이에 배치되고, 이 가변스로틀부의 출구압력이 밸브개방방향으로 가해지고, 또한 상기 제어압력이 밸브폐쇄방향으로 가해지는 압력제어기(32)이며, 상기 제1의 흐름제어수단(71,73)은 상기 한쪽의 가변스로틀부(43)의 출구측을 상기 압력제어기(32)를 통해서 상기 대응하는 부하통로(36)에 연락하는 것을 특징으로 하는 밸브장치.
  6. 제1항에 있어서, 상기 압력제어수단이 상기 공급통로(35)와 상기 1쌍의 가변스로틀부(43,44)와의 사이에 배치되고, 이 가변스로틀부의 출구압력 및 상기 압유공급원(11)으로부터의 공급압력이 밸브개방방향으로 가해지고, 또한 가변스로틀부의 입구압력 및 상기 제어압력이 밸브폐쇄방향으로 가해지는 압력보상밸브(32A)이며, 상기 제1의 흐름제어수단(86;73)은 상기 한쪽의 가변스로틀부(43)의 출구측을 직접으로 상기 대응하는 부하통로(36)에 연락하는 것을 특징으로 하는 밸브장치.
  7. 압유공급원(11)과, 이 압유공급원으로부터의 압유에 의해 구동되는 최소한 하나의 액튜에이터(12)와, 이 액튜에이터에 공급되는 압유의 흐름을 제어하는 밸브장치(10;10A)를 가지고 상기 밸브장치가 상기 압유공급원에 연락된 공급통로(35)및 상기 액튜에이터에 연락된 1쌍의 부하통로(36,37)와, 상기 공급통로와 상기 1쌍의 부하통로와의 사이에 배치되고, 또한 축방향으로 이동가능한 밸브스풀(42;42A)에 형성되고, 이 밸브스풀의 이동량에 따라서 폐쇄상태로 부터 연속적으로 개구면적을 변화시키는 1쌍의 가변스로틀부(43,44)와 상기 1쌍의 가변스로틀부와 상기 1쌍의 부하통로와의 사이에 위치하는 제1의 통로(39;86,87)를 가진 방향전환밸브(31;31A)와, 상기 가변스로틀부의 전후차압을 소정치로 유지하는 압력 조정수단(32;32A)과, 상기 제1의 통로(39;86,87)로 부터 분기되고, 상기 액튜에이터의 작동에 의해 발생하는 부하압력이 유도되는 검출관로(57;57A)와, 이 검출관로에 의해 유도된 부하압력과 다른 부하압력중의 최대부하압력을 선택하는 고압선택수단(59;90,91)과, 상기 고압선택수단으로 선택된 최대부하압력을 제어압력으로서 상기 압력조정수단에 유도하는 제어관로(61,62)를 구비한 유압회로장치에 있어서, 상기 밸브장치(10;10A)가 상기 제1의 통로(39,86)의 상기 검출관로(57;57A)의 분기점보다 하류측에 배치되고, 상기 가변스로틀부의 한쪽(43)이 개방되었을 때에, 상기 제1의 통로로부터 그 한쪽의 가변스로틀부에 대응하는 부하통로(36)로 향하는 압유의 흐름은 가능하게 하고, 역방향의 압유의 흐름은 저지하는 흐름제어수단(71,73;86,73)을 구비한 것을 특징으로 하는 유압회로장치.
  8. 제7항에 있어서, 상기 흐름제어수단은 상기 밸브스풀(42;42A)내에 형성되고, 상기 가변스로틀부의 한쪽(43)이 개방되었을 때에 상기 제1의 통로(39;86)에 있어서의 상기 검출관로(57)의 분기점보다 하류측의 부분과 상기 한쪽의 가변스로틀부(43)에 대응하는 부하통로(36)를 연락하는 제2의 통로(71;86)와, 상기 제2의 통로(71;86)에 배치되고, 상기 대응하는 부하통로(36)로부터 상기 제1의 통로(39,86)로 향하는 압유의 흐름을 저지하는 체크밸브(73)를 구비한 것을 특징으로 하는 유압회로장치.
  9. 제7항에 있어서, 상기 압유공급원이 유압펌프(22)와, 이 유압펌프의 토출압력과 상기 최대부하압력과의 차압을 대략 일정하게 유지하도록 유압펌프의 토출량을 제어하는 펌프제어수단(23)을 가진 것을 특징으로 하는 유압회로장치.
    ※ 참고사항 : 최초출원 내용에 의하여 공개되는 것임.
KR1019910700261A 1989-08-16 1990-08-16 밸브장치 및 유압회로장치 KR950004530B1 (ko)

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JP89-210043 1989-08-16
JP89-210,043 1989-08-16
JP21004389 1989-08-16
PCT/JP1990/001045 WO1991002902A1 (en) 1989-08-16 1990-08-16 Valve device and hydraulic circuit device

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EP0438606A1 (en) 1991-07-31
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WO1991002902A1 (en) 1991-03-07
US5146747A (en) 1992-09-15

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