JP3923242B2 - 油圧駆動機械のアクチュエータ制御装置 - Google Patents

油圧駆動機械のアクチュエータ制御装置 Download PDF

Info

Publication number
JP3923242B2
JP3923242B2 JP2000214405A JP2000214405A JP3923242B2 JP 3923242 B2 JP3923242 B2 JP 3923242B2 JP 2000214405 A JP2000214405 A JP 2000214405A JP 2000214405 A JP2000214405 A JP 2000214405A JP 3923242 B2 JP3923242 B2 JP 3923242B2
Authority
JP
Japan
Prior art keywords
pressure
valve
bucket
hydraulic
arm
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.)
Expired - Fee Related
Application number
JP2000214405A
Other languages
English (en)
Japanese (ja)
Other versions
JP2002031104A (ja
Inventor
圭介 高
純 丸山
直樹 石崎
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.)
Komatsu Ltd
Original Assignee
Komatsu 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
Application filed by Komatsu Ltd filed Critical Komatsu Ltd
Priority to JP2000214405A priority Critical patent/JP3923242B2/ja
Priority to DE10109510A priority patent/DE10109510B4/de
Priority to KR1020010042138A priority patent/KR100797729B1/ko
Priority to CNB01120088XA priority patent/CN1237285C/zh
Publication of JP2002031104A publication Critical patent/JP2002031104A/ja
Application granted granted Critical
Publication of JP3923242B2 publication Critical patent/JP3923242B2/ja
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/36—Component parts
    • E02F3/42—Drives for dippers, buckets, dipper-arms or bucket-arms
    • E02F3/43—Control of dipper or bucket position; Control of sequence of drive operations
    • E02F3/431—Control of dipper or bucket position; Control of sequence of drive operations for bucket-arms, front-end loaders, dumpers or the like
    • E02F3/432—Control of dipper or bucket position; Control of sequence of drive operations for bucket-arms, front-end loaders, dumpers or the like for keeping the bucket in a predetermined position or attitude
    • E02F3/433—Control of dipper or bucket position; Control of sequence of drive operations for bucket-arms, front-end loaders, dumpers or the like for keeping the bucket in a predetermined position or attitude horizontal, e.g. self-levelling
    • 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
    • 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
    • E02F9/2217—Hydraulic or pneumatic drives with energy recovery arrangements, e.g. using accumulators, flywheels
    • 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
    • E02F9/2285—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
    • F15B11/20—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors controlling several interacting or sequentially-operating 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
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/14—Energy-recuperation 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
    • F15B2211/30—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
    • 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
    • F15B2211/50—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
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50563—Pressure control characterised by the type of pressure control means the pressure control means controlling a differential 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
    • F15B2211/52—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
    • F15B2211/55—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
    • F15B2211/57—Control of a differential 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
    • F15B2211/6054—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
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
    • 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

Landscapes

  • 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)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Operation Control Of Excavators (AREA)
  • Fluid-Pressure Circuits (AREA)
JP2000214405A 2000-07-14 2000-07-14 油圧駆動機械のアクチュエータ制御装置 Expired - Fee Related JP3923242B2 (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2000214405A JP3923242B2 (ja) 2000-07-14 2000-07-14 油圧駆動機械のアクチュエータ制御装置
DE10109510A DE10109510B4 (de) 2000-07-14 2001-02-28 Vorrichtung zur Aktuatorensteuerung von Hydraulik-Antriebsmaschinen
KR1020010042138A KR100797729B1 (ko) 2000-07-14 2001-07-12 유압구동기계의 액추에이터 제어장치
CNB01120088XA CN1237285C (zh) 2000-07-14 2001-07-13 用于控制液压驱动机械的执行器的液压回路

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2000214405A JP3923242B2 (ja) 2000-07-14 2000-07-14 油圧駆動機械のアクチュエータ制御装置

Publications (2)

Publication Number Publication Date
JP2002031104A JP2002031104A (ja) 2002-01-31
JP3923242B2 true JP3923242B2 (ja) 2007-05-30

Family

ID=18709984

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2000214405A Expired - Fee Related JP3923242B2 (ja) 2000-07-14 2000-07-14 油圧駆動機械のアクチュエータ制御装置

Country Status (4)

Country Link
JP (1) JP3923242B2 (zh)
KR (1) KR100797729B1 (zh)
CN (1) CN1237285C (zh)
DE (1) DE10109510B4 (zh)

Families Citing this family (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004003612A (ja) * 2002-04-09 2004-01-08 Komatsu Ltd シリンダ駆動システム及びそのエネルギ回生方法
EP1541872B1 (en) * 2002-07-09 2007-08-29 Hitachi Construction Machinery Co., Ltd. Hydraulic drive unit
JP3816893B2 (ja) 2003-04-17 2006-08-30 日立建機株式会社 油圧駆動装置
JP4410512B2 (ja) 2003-08-08 2010-02-03 日立建機株式会社 油圧駆動装置
DE10349714B4 (de) * 2003-10-23 2005-09-08 Sauer-Danfoss Aps Steuervorrichtung für eine hydraulische Hebevorrichtung
KR100662141B1 (ko) * 2004-11-09 2006-12-27 엘지전자 주식회사 냉장고의 음식물 장기 보관장치 및 보관방법
CN100362247C (zh) * 2004-12-17 2008-01-16 卢永松 带负荷敏感双泵合流型多路比例操纵阀
CN100410549C (zh) * 2004-12-28 2008-08-13 东芝机械株式会社 液压控制装置
JP4839928B2 (ja) * 2006-03-31 2011-12-21 コベルコ建機株式会社 建設機械の油圧制御装置
JP4531720B2 (ja) * 2006-04-28 2010-08-25 北都建機サービス株式会社 挟み処理装置
JP4815338B2 (ja) * 2006-12-18 2011-11-16 日立建機株式会社 油圧ショベルの油圧駆動装置
JP2009204074A (ja) * 2008-02-27 2009-09-10 Komatsu Ltd 油圧アクチュエータの駆動制御装置
KR101728381B1 (ko) * 2010-06-28 2017-04-19 볼보 컨스트럭션 이큅먼트 에이비 건설기계의 유압펌프 유량 제어방법
CN102465935B (zh) * 2010-11-11 2014-12-10 徐州重型机械有限公司 压力补偿阀及应用该阀的负载敏感液压系统、起重机
JP5496135B2 (ja) * 2011-03-25 2014-05-21 日立建機株式会社 油圧作業機の油圧システム
JP5956184B2 (ja) * 2012-02-27 2016-07-27 株式会社小松製作所 油圧駆動システム
KR200464754Y1 (ko) * 2012-07-11 2013-01-17 (주)동해기계 유압조절블록을 구비한 유압식 그랩버킷
DE102012218428A1 (de) * 2012-10-10 2014-04-10 Robert Bosch Gmbh Open-Center-Ventilblock mit zwei Pumpenanschlüssen und zugeordneten Hilfsschiebern an den Hauptschiebern
WO2014061741A1 (ja) * 2012-10-18 2014-04-24 日立建機株式会社 作業機械
JP6220227B2 (ja) * 2013-10-31 2017-10-25 川崎重工業株式会社 油圧ショベル駆動システム
JP6323831B2 (ja) 2014-06-02 2018-05-16 ヤンマー株式会社 油圧装置
BR102016025741B1 (pt) * 2016-11-03 2022-03-29 Cnh Industrial America Llc Sistema de controle para uma pá carregadeira de um veículo de trabalho
JP6910983B2 (ja) * 2018-03-28 2021-07-28 株式会社クボタ 作業機の油圧システム
JP7030594B2 (ja) * 2018-03-28 2022-03-07 株式会社クボタ 作業機の油圧システム
CN111963505B (zh) * 2020-07-22 2022-03-25 中联重科股份有限公司 液压系统组合动作控制方法、控制装置及工程机械

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3563137A (en) * 1969-06-30 1971-02-16 Cessna Aircraft Co Hydraulic self-leveling control for boom and bucket
JPS63115903A (ja) * 1986-11-05 1988-05-20 Kobe Steel Ltd 油圧制御装置
US4923362A (en) * 1988-06-06 1990-05-08 Deere & Company Bucket leveling system with dual fluid supply
JPH0765323B2 (ja) * 1989-02-23 1995-07-19 株式会社豊田自動織機製作所 ショベルローダのブーム及びバケット制御装置
DK167322B1 (da) * 1991-10-28 1993-10-11 Danfoss As Hydraulisk kredsloeb
JPH0960032A (ja) * 1995-08-18 1997-03-04 Toyota Autom Loom Works Ltd ショベルローダのセルフレベリング装置
US5797310A (en) * 1997-01-29 1998-08-25 Eaton Corporation Dual self level valve

Also Published As

Publication number Publication date
KR20020006607A (ko) 2002-01-23
JP2002031104A (ja) 2002-01-31
KR100797729B1 (ko) 2008-01-24
CN1333435A (zh) 2002-01-30
DE10109510B4 (de) 2011-06-22
CN1237285C (zh) 2006-01-18
DE10109510A1 (de) 2002-01-31

Similar Documents

Publication Publication Date Title
JP3923242B2 (ja) 油圧駆動機械のアクチュエータ制御装置
EP0795690B1 (en) Hydraulic driving device
JP4272207B2 (ja) 建設機械の油圧制御装置
US6430922B2 (en) Construction machine
US5277027A (en) Hydraulic drive system with pressure compensting valve
US5079919A (en) Hydraulic drive system for crawler mounted vehicle
US10393151B2 (en) Hydraulic drive system for working machine
JP2839625B2 (ja) 油圧駆動装置
WO2014192458A1 (ja) 建設機械の油圧駆動装置
JP6021226B2 (ja) 建設機械の油圧駆動装置
JP6001846B2 (ja) 油圧制御装置、及びそれを備える建設機械
JP3477687B2 (ja) 流量制御装置
CN109563695B (zh) 挖土机、挖土机用控制阀门
US7059237B2 (en) Multiple-directional switching valve
JP3763375B2 (ja) 建設機械の制御回路
JP3986218B2 (ja) 油圧駆動機械のアクチュエータ制御装置およびバケット姿勢制御装置
CN113302403B (zh) 用于工程机器的液压控制回路
JP2002005109A (ja) 操作制御装置
JP3760055B2 (ja) 建設機械の油圧駆動制御装置
JP2592502B2 (ja) 油圧駆動装置及び油圧建設機械
CN108779786B (zh) 作业车辆以及液压控制方法
JP3522959B2 (ja) 油圧駆動装置
JP7379307B2 (ja) 作業機の油圧システム
US20220282454A1 (en) Hydraulic System
JP2021055800A (ja) 作業機の油圧システム

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20060221

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20060922

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20061003

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20061204

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20070220

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20070221

R150 Certificate of patent or registration of utility model

Free format text: JAPANESE INTERMEDIATE CODE: R150

Ref document number: 3923242

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110302

Year of fee payment: 4

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120302

Year of fee payment: 5

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120302

Year of fee payment: 5

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130302

Year of fee payment: 6

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130302

Year of fee payment: 6

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20140302

Year of fee payment: 7

LAPS Cancellation because of no payment of annual fees