KR920001090A - 토목 · 건설기계의 유압구동장치 - Google Patents

토목 · 건설기계의 유압구동장치 Download PDF

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KR920001090A
KR920001090A KR1019910010115A KR910010115A KR920001090A KR 920001090 A KR920001090 A KR 920001090A KR 1019910010115 A KR1019910010115 A KR 1019910010115A KR 910010115 A KR910010115 A KR 910010115A KR 920001090 A KR920001090 A KR 920001090A
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hydraulic
pressure
communication means
chamber
unload valve
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KR1019910010115A
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KR950001408B1 (ko
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가즈노리 나까무라
히데아끼 다나까
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오까다 하지메
히다찌 겐끼 가부시기가이샤
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—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
    • 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
    • E02F9/2235—Control of flow rate; Load sensing arrangements using one or more variable displacement pumps including an electronic controller
    • 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
    • E02F9/2296—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
    • F15B11/165—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
    • F15B2211/20538—Type of pump constant 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
    • F15B2211/20—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
    • F15B2211/253—Pressure margin control, e.g. pump pressure in relation to 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
    • F15B2211/30—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
    • F15B2211/31—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
    • F15B2211/321—Directional control characterised by the type of actuation mechanically
    • F15B2211/324—Directional control characterised by the type of actuation mechanically manually, e.g. by using a lever or pedal
    • 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
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/87169—Supply and exhaust
    • Y10T137/87177—With bypass
    • Y10T137/87185—Controlled by supply or exhaust valve

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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)
  • Fluid-Pressure Circuits (AREA)

Abstract

내용 없음

Description

토목 · 건설기계의 유압구동장치
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음
제1도는 본원 발명의 제1실시예에 의한 토목 · 건설기계의 유압구동장치의 회로구성을 나타낸 개략도,
제2도는 제1도에 도시한 언로드밸브의 구조를 나타낸 단면도,
제3도는 제2도에 도시한 언로드밸브의 LS 차암과 스트로크와의 관계를 나타낸 특성도.

Claims (11)

  1. 유압펌프를 포함하는 유압원과, 이 유압원으로부터 공급되는 압유에 의해서 구동하는 유압액튜에이터와, 상기 유압원으로부터 상기 유압액튜에이터에 공급되는 압유의 흐름을 제어하는 방향전환 밸브와, 상기 유압펌프의 토출관로에 접속되고, 상기 유압펌프의 토출압력과 상기 액튜에이터의 부하압력과의 차압이 제1의 소정치를 초과하면 유압펌프로부터의 압유를 탱크에 방출하여, 그 차압을 제어하는 언로드밸브를 구비하고, 상기 언로드밸브가 스풀과, 상기 스풀의 일단측에 배설되어 유압펌프의 토출압력이 도입되는 제1의 수압실, 상시 스풀의 타단측에 배설되어 상기 유압액튜에이터의 부하압력이 도입되는 제2의 수압실을 가진 토목 · 건설기계의 유압구동장치에 있어서, 상기 언로드밸브는 상기 제1의 수압실과 상기 제2의 수압실과를 선택적으로 연통시키는 제한적 연통수단을 포함하는 것을 특징으로 하는 토목 · 건설기계의 유압구동장치.
  2. 제1항에 있어서, 상기 제한적 연통수단은 상기 차압이 상기 제1의 소정치보다 큰 제2의 소정치를 초과했을때 상기 제1의 수압실과 상기 제2의 수압실과를 연통시키는 것을 특징으로 하는 토목 · 건설기계의 유압구동장치.
  3. 제1항에 있어서, 상기 제한적 연통수단은 상기 제1의 수압실과 상기 제2의 수압실과를 연통시키는 통로와, 상기 통로중에 배설된 스로틀을 포함하는 것을 특징으로 하는 토목 · 건설기계의 유압구동장치.
  4. 제1항에 있어서, 상기 제한적 연통수단은 상기 스풀내에 배설되어 있는 것을 특징으로 하는 토목 · 건설기계의 유압구동장치.
  5. 제1항에 있어서, 상기 제한적 연통수단은 상기 언로드밸브의 본체를 구성하는 하우징에 배설되어 있는 것을 특징으로 하는 토목 · 건설기계의 유압구동장치.
  6. 상기 유압펌프가 가변용량형의 펌프이며, 상기 유압원은 다시 상기 유압펌프의 토출압력과 부하압력과의 차압이 제3의 소정치로 유지되도록 상기 유압 펌프의 토출유량을 제어하는 레귤레이터를 포함하는 청구의 범위 제1항의 토목 · 건설기계의 유압구동장치에 있어서, 상기 제한적 연통수단은 상기 차압이 상기 제1 및 제2의 소정치보다 큰 제4의 소정치를 초과했을때 상기 제1의 수압실과 상기 제2의 수압실과를 연통시키는 것을 특징으로 하는 토목 · 건설기계의 유압구동장치.
  7. 유압펌프를 포함하는 유압원과, 이 유압원으로부터 공급되는 압유에 의해서 구동하는 유압액튜에이터와, 상기 유압원으로부터 상기 유압액튜에이터에 공급되는 압유의 흐름을 제어하는 방향전환 밸브를 구비한 토목 · 건설기계의 유압구동장치에 있어서, 상기 유압펌프의 토출관로에 접속되고, 상기 유압펌프의 토출압력과 상기 액튜에이터의 부하압력과의 차압이 제1의 소정치를 초과하면 유압펌프로부터의 압유를 탱크에 방출하여, 그 차압을 제어하는 언로드밸브로서, 상기 언로드밸브가 스풀과, 상기 스풀의 일단측에 배설되어 유압펌프의 토출압력이 도입되는 제1의 수압실, 상기 스풀의 타단측에 배설되어 상기 유압액튜에이터의 부하압력이 도입되는 제2의 수압실을 가진 언로드밸브에 있어서, 상기 제1의 수압실과 상기 제2의 수압실과를 선택적으로 연통시키는 제한적 연통수단을 배설하는 것을 특징으로 하는 유압구동장치용 언로드밸브.
  8. 제7항에 있어서, 상기 제한적 연통수단은 상기 차압이 상기 제1의 소정치보다 큰 제2의 소정치를 초과했을때 상기 제1의 수압실과 상기 제2의 수압실과를 연통시키는 것을 특징으로 하는 유압구동장치용 언로드밸브.
  9. 제7항에 있어서, 상기 제한적 연통수단은 상기 제1의 수압실과 상기 제2의 수압실과를 연통시키는 통로와, 상기 통로중에 배설된 스로틀을 포함하는 것을 특징으로 하는 유압구동장치용 언로드밸브.
  10. 제7항에 있어서, 상기 제한적 연통수단은 상기 스풀내에 배설되어 있는 것을 특징으로 하는 유압구동장치용 언로드밸브.
  11. 제7항에 있어서, 상기 제한적 연통수단은 상기 언로드밸브 본체를 구성하는 하우징에 배설되어 있는 것을 특징으로 하는 유압구동장치용 언로드밸브.
    ※ 참고사항 : 최초출원 내용에 의하여 공개되는 것임.
KR1019910010115A 1990-06-19 1991-06-19 토목, 건설기계의 유압구동장치 KR950001408B1 (ko)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP90-158744 1990-06-19
JP15874490 1990-06-19

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KR920001090A true KR920001090A (ko) 1992-01-30
KR950001408B1 KR950001408B1 (ko) 1995-02-18

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Country Link
US (1) US5129229A (ko)
EP (1) EP0462590B1 (ko)
KR (1) KR950001408B1 (ko)
DE (1) DE69115763T2 (ko)

Cited By (1)

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KR100375123B1 (ko) * 1999-12-23 2003-03-28 대웅전기산업주식회사 가정용 중탕기

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EP0462590B1 (en) 1995-12-27
KR950001408B1 (ko) 1995-02-18
EP0462590A1 (en) 1991-12-27
DE69115763D1 (de) 1996-02-08
DE69115763T2 (de) 1996-05-15

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