KR940701487A - 토목·건설 기계의 유압회로장치 - Google Patents

토목·건설 기계의 유압회로장치

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Publication number
KR940701487A
KR940701487A KR1019930703877A KR930703877A KR940701487A KR 940701487 A KR940701487 A KR 940701487A KR 1019930703877 A KR1019930703877 A KR 1019930703877A KR 930703877 A KR930703877 A KR 930703877A KR 940701487 A KR940701487 A KR 940701487A
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South Korea
Prior art keywords
pressure
signal
hydraulic
valve
traveling
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KR1019930703877A
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English (en)
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KR0132687B1 (ko
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겐로구 스기야마
도이찌 히라다
Original Assignee
오까다 하지메
히다찌 겐끼 가부시기가이샤
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Publication of KR0132687B1 publication Critical patent/KR0132687B1/ko

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/0401—Valve members; Fluid interconnections therefor
    • F15B13/0402—Valve members; Fluid interconnections therefor for linearly sliding valves, e.g. spool valves
    • F15B13/0403—Valve members; Fluid interconnections therefor for linearly sliding valves, e.g. spool valves a secondary valve member sliding within the main spool, e.g. for regeneration flow
    • 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
    • E02F9/2239—Control of flow rate; Load sensing arrangements using two or more pumps with cross-assistance
    • 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
    • E02F9/2282—Systems using center bypass type changeover 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
    • E02F9/2285—Pilot-operated systems
    • 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
    • E02F9/2292—Systems with two or more 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
    • E02F9/2296—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
    • 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
    • F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
    • 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
    • F15B13/0418—Load sensing elements sliding within a hollow main valve spool
    • 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
    • F15B2211/205—Systems with pumps
    • F15B2211/20576—Systems with pumps with multiple pumps
    • 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
    • F15B2211/3116—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
    • F15B2211/30—Directional control
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3122—Special positions other than the pump port being connected to working ports or the working ports being connected to the return line
    • F15B2211/3127—Floating position connecting the working ports and 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
    • F15B2211/30—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
    • F15B2211/30—Directional control
    • F15B2211/365—Directional control combined with flow control and 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
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40515—Flow control characterised by the type of flow control means or valve with variable 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
    • F15B2211/42—Flow control characterised by the type of actuation
    • F15B2211/428—Flow 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
    • F15B2211/45—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
    • F15B2211/60—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
    • F15B2211/6051—Load sensing circuits having valve means between output member and the load sensing circuit
    • F15B2211/6057—Load sensing circuits having valve means between output member and the load sensing circuit using directional control 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
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7058—Rotary output members
    • 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
    • F15B2211/7142—Multiple output members, e.g. multiple hydraulic motors or cylinders the output members being arranged in multiple groups
    • 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

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

Abstract

토목·건설기계의 유압회로장치에 있어서, 좌주행용 방향전환밸브(47)의 제1의 가변스로틀(107,177a)과 제1의 주행모터(57)와의 사이에, 제1의 가변스로틀의 하류압력을 제1의 신호압력에 따른 값으로 제어하는 제1의 압력조정기(130)를 배치하고, 우주행용 방향전환밸브(49)의 제2의 가변스로틀(108,108a)과 제2의 주행모터(58)와의 사이에, 제2의 가변스로틀의 하류압력을 제2의 신호압력에 따른 값으로 제어하는 제2의 압력조정기(133)를 배치한다. 또한, 제1의 주행모터의 부하압력과 제2의 주행모터의 부하압력중 높은 쪽의 압력을 최대 부하압력으로서 셔틀밸브(136)로 검출하고, 제1 및 제2의 주행모터와 복수의 작업기 액튜에이터(53∼56)의 최소한 하나를 동시에 구동하는 복합조작시에 신호전환밸브(131,135,170)를 작동시켜서, 제1및 제2의 신호압력으로서 그 최대부하압려을 제1 및 제2의 압력조정기에 부여한다. 이로써, 주행과 작업기의 복합조작시에 작업기 액튜에이터의 작동에 따라서 연통회로(110)가 작동하고, 제2의 주행용 방향전환 밸브의 압유공급회로(104)와 제1의 주행용 방향전환밸브의 압유공급회로(103)가 연통해도, 제1 및 제2의 가변스로틀의 전후차압이 대략 같아지고, 직진주행성을 확보할 수 있다.

Description

토목·건설기계의 유압회로장치
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음
제1도는 본 발명의 제1의 실시예에 의한 토목·건설기계의 유압 회로장치의 구성을 나타낸 회로도이다,
제2도는 제1도에 나타낸 제1 및 제2의 밸브그룹의 상세를 나타낸 회로도이다,
제3도는 제1도에 나타낸 유압회로장치가 탑재된 유압쇼벨의 측면도이다,
제6도는 본 발명의 제2의 실시예에 의한 유압회로장치의 구성을 나타낸 회로도이다,
제7도는 본 발명의 제3의 실시예에 의한 유압회로장치의 구성을 나타낸 회로도이다,
제8도는 제7도에 나타낸 주행용 방향전환밸브의 요부의 구조를 나타낸 단면도이다.

Claims (9)

  1. 제1 및 제2의 유압펌프(35,36)와; 상기 제1 및 제2의 유압펌프로부터 토출되는 압유에 의해 구동되는 복수의 유압액튜에이터(53∼58)와; 상기 제1의 유압펌프의 토출관로(41)에 접속되어, 관련된 유압액류에이터(53∼57)에 공급되는 압유의 유량을 제어하는 제1의 밸브그룹(39)과; 상기 제2의 유압펌프의 토출관로(42)에 접속되어, 관련된 유압액튜에이터(54∼58)에 공급되는 압유의 유량을 제어하는 제2의 밸브그룹(40)을 가지고; 상기 복수의 유압액튜에이터는 1쌍의 주행장치(204,25)를 각각 구동하는 제1 및 제2의 주행모터(57,58)와, 복수의 작업기(200∼203)를 각각 구동하는 복수의 작업기 액튜에이터(53∼56)를 포함하고. 상기 제1의 밸브그룹은 상기 제1의 주행모터에 공급되는 압유의 유량을 제어하는 제1의 주행용 방향전환밸브(47)와, 상기 복수의 작업기 액튜에이터의 최소한 일부(53∼56)에 공급되는 압유의 유량을 제어하는 복수의 제1의 방향전환밸브(43∼46)를 포함하고, 또한 상기 복수의 제1방향전환밸브는 상기 제1의 주행용 방향전환밸브보다 우선적으로 상기 제1의 유압펌프로부터의 압유를 관련된 작업기 액튜에이터(53∼56)에 공급하도록 접속되고, 상기 제2의 밸브그룹은 상기 제2의 주행모터에 공급되는 압유의 유량을 제어하는 제2의 주행용 방향전환밸브(49)와, 상기 복수의 작업기 액튜에이터의 최소한 일부(54∼56)에 공급하도록 접속되고, 상기 제2의 밸브그릅은 상기 제2의 주행모터에 공급되는 압유의 유량을 제어하는 제2의 주행용 방향전환밸브(49)와, 상기 복수의 작업기 액튜에이터의 최소한 일부(54∼56)에 공급되는 압유의 유량을 제어하는 복수의 제2의 방향전환밸브(50∼52)를 포함하고, 또한 상기 제2의 주행용 방향전환밸브는 상기 복수의 제2의 방향전환밸브보다 우선적으로 상기 제2의 유압펌프로부터의 압유를 상기 제2의 주행모터에 공급하도록 접속되고, 상기 제1 및 제2의 주행용 방향전환밸브(47,49)는 각각 제1 및 제2의 조작 수단(165, 166)의 조작량에 따라서 개구면적을 변화시켜 상기 압유의 유량을 제어하는 제1 및 제2의 가변스로틀(107,107a;108,108a)을 구비하고; 상기 복수의 작업기 액튜에이터의 최소한 하나의 작동에 따라서 상기 제2의 주행용 방향전환밸브의 압유공급회로(104)를 상기 제1의 주행용 방항전환밸브의 압유공급회로(103)에 연통시키는 연통회로(110)를 더 가지는 토목·건설기계의 유압회로장치에 있어서, (a)상기 제1의 가변스로틀(107,107a)과 상기 제1의 주행모터(57)와의 사이에 배치되어, 제1의 가변스로틀의 하류압력을 제1의 신호압력에 따른 값으로 제어하는 제1의 압력조정수단(130)과; (b)상기 제2의 가변스로틀(108,108a)과 상기 제2의 주행모터(58)와의 사이에 배치되어, 제2의 가변스로틀의 하류압력을 제2의 신호압력에 따른 값으로 제어하는 제2의 압력조정수단(133)과; (c)상기 제1의 주행모터의 부하압력과 상기 제2의 주행모터의 부하압력중 높은 쪽의 압력을 최대부하압력으로서 검출하는 압력선택수단(136)과; (d)상기 제1 및 제2의 주행모터와 상기 복수의 작업기 액튜에이터(53∼56)의 최소한 하나를 동시에 구동하는 복합조작시에, 상기 제1 및 제2의 신호압력으로서 상기 최대부하압력을 상기 제1 및 제2의 압력조정수단에 부여하는 신호전환수단(131,135,170)과;를 가지는 것을 특징으로 하는 토목·건설기계의 유압회로장치.
  2. 제1항에 있어서, 상기 신호전환수단(131,135,170)은 상기 복수의 작업기 액튜에이터(53∼56)의 최소한 하나가 작동하였을 때에 상기 제1 및 제2의 신호압력으로서 상기 최대부하압력을 상기 제1 및 제2의 압력조정수단(130,133)에 부여하는 것을 특징으로 하는 토목·건설기계의 유압회로장치.
  3. 제1항에 있어서, 상기 신호전환수단은 상기 복수의 작업기 액튜에이터(53∼56)의 최소한 하나의 작동을 검출하는 작동검출수단(170)과, 상기 작동검출수단으로부터의 신호에 따라서, 당해 작동이 검출되지 않을 때에는 상기 제1 및 제2의 신호압력으로서 각각 관련된 액튜에이터의 부하압력을 상기 제1 및 제2의 압력조정수단(130,133)에 부여하고, 당해 작동이 검출되면 상기 최대부하압력을 상기 제1 및 제2의 압력조정수단에 부여하는 최소한 하나의 신호전환밸브(131,135,155)를 가지는 것을 특징으로 하는 토목·건설기계의 유압회로장치.
  4. 제1항에 있어서, 상기 신호전환수단(131B,135B,178,179)은 상기 제1 및 제2의 가변스로틀(107,107a;108,108a)의 개구면적이 최대근방의 소정개구면적보다 클 때에 상기 제1및 제2의 신호압력으로서 상기 최대부하압력을 상기 제1및 제2의 압력조정수단(130,133)에 부여하는 것을 특징으로 하는 토목·설기계의 유압회로장치.
  5. 제1항에 있어서, 상기 신호전환수단은 상기 제1 및 제1의 가변스로틀(107,107a;l08,108a)의 개구면적이 최대근방의 소정개구면적 이하일 때는, 상기 제1 및 제2의 신호압력으로서 각각 상기 제1 및 제2의 주행모터(57,58)의 부하압력을 상기 제1 및 제2의 압력조정 수단(130,133)에 부여하고, 상기 제1 및 제2의 가변스로틀의 개구 면적이 최대개구면적 근방의 개구면적보다 커지면, 상기 제1 및 제2의 신호압력으로서 상기 최대부하압력을 상기 제1 및 제2의 압력 조정수단에 부여하는 최소한 하나의 신호전환밸브(131B,135b)를 가지는 것을 특징으로 하는 토목·건설기계의 유압회로장치.
  6. 제1항에 있어서, 상기 제1 및 제2의 압력조정수단은 각각 상기 제1 및 제2의 주행용 방향전환밸브에 내장된 입력조정밸브(142,142a,143,143a)인 것을 특징으로 하는 토목·건설기계의 유압회로 장치.
  7. 제1항에 있어서, 상기 신호전환수단은 상기 제1 및 제2의 압력 조정수단(130,133)에 대해 각각 설치된 제1 및 제2의 신호전환밸브(131,135)를 가지는 것을 특징으로 하는 토목·건설기계의 유압회로 장치.
  8. 제1항에 있어서, 상기 신호전환수단은 상기 제1 및 제2의 압력 조정수단(130,133)에 대해 공통으로 설치된 단일의 신호전환밸브(155)를 가지는 것을 특징으로 하는 토목·건설기계의 유압회로장치.
  9. 제1항에 있어서, 상기 제1 및 제2의 압력조정수단은 각각 상기 제1 및 제2의 주행용 방향전환밸브(47C,49C)에 내장되고, 상기 신호전환수단은 상기 제1 및 제2의 주행용 향전환밸브의 스풀(371,401)위치에 따라서 개폐하는 전환통로(141,141a)를 포함하는 것을 특징으로 하는 토목·건설기계의 유압회로장치.
    ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.
KR1019930703877A 1992-04-20 1993-04-20 토목, 건설기계의 유압회로장치 KR0132687B1 (ko)

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WO1993021395A1 (en) 1993-10-28
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DE69319400D1 (de) 1998-08-06
DE69319400T2 (de) 1998-12-03
EP0593782B1 (en) 1998-07-01
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US5446979A (en) 1995-09-05

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